DEGCAGS Syndrome

Mendelian MONDO:0859181 Pathograph 64 Show in embeddings browser Neurodevelopmental disorder Multiple congenital anomalies syndrome

DEGCAGS syndrome (developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities; OMIM 619488) is an autosomal recessive multiple-malformation neurodevelopmental disorder caused by biallelic loss-of-function variants in ZNF699. ZNF699 encodes a KRAB zinc finger protein of unknown function, distantly related to the Drosophila gene hangover, and before 2021 it was known in human genetics only as a candidate locus for alcohol dependence. The syndrome was delineated by Bertoli-Avella and colleagues in 2021 from 13 children in 12 consanguineous families carrying homozygous frameshift variants, and the 2024 Karimi cohort brought the published case base to about 30 individuals. The clinical picture is severe global developmental delay with hypotonia and a recognisable coarse facial gestalt (thick eyebrows with synophrys, long eyelashes, bulbous nose, smooth philtrum, wide mouth, micrognathia), on which sit discordant congenital anomalies: intestinal atresia requiring surgery in the first days of life, septal and pulmonary valve defects, renal hypoplasia and genital anomalies, and limb anomalies of the preaxial-polydactyly, absent-thumb and syndactyly type. Anemia or pancytopenia, premature graying of hair, sensorineural hearing loss, airway malacia and recurrent infections recur across the cohort, and infant mortality is substantial: one evaluated child in the founding cohort died at nine months and eight siblings of the identified children had died in infancy. The organ anomalies are discordant even between full siblings homozygous for the same variant, and no genotype-phenotype correlation is established. Two things distinguish the entry mechanistically. First, there is no experimental system for ZNF699 and no functional work has been reported, so the pathograph stops at the genetic lesion and a set of organ-system consequences that the cohorts document but do not explain. Second, a robust and specific blood DNA methylation episignature has been identified and is now used diagnostically to classify ZNF699 variants of uncertain significance; whether the methylation changes mediate the phenotype, as the 2024 differentially-methylated-region analysis tentatively suggests, is an open hypothesis and is recorded as one. A 2026 report of a young adult with combined immunodeficiency and near-absent B cells extends the immune phenotype from recurrent infections to a characterised inborn error of immunity.

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Inheritance

Autosomal recessive HP:0000007

Autosomal recessive. The founding cohort was entirely homozygous, reflecting ascertainment in consanguineous families; the first non-consanguineous case carried two nonsense variants in trans, one from each parent, which established that compound heterozygosity produces the same syndrome. Heterozygous carriers are unaffected and, on methylation profiling, cluster separately from both patients and controls.

Autosomal recessive inheritance

Show evidence (3 references)

PMID:35205213 SUPPORT Human Clinical

"The DEGCAGS syndrome is inherited in the autosomal recessive mode."

States the mode of inheritance directly.

PMID:35205213 SUPPORT Human Clinical

"Testing of the parents showed that the variant p.Gln179Ter was inherited from the mother, while p.Arg443Ter was inherited from the father (Figure 2), which is consistent with in trans variants transmission in the autosomal recessive mode of inheritance."

Segregation in the first compound heterozygous family, which is the evidence that the recessive mode holds outside consanguineous homozygosity.

PMID:39424669 SUPPORT Human Clinical

"DEGCAGS syndrome is a clinically variable recessive syndrome even among siblings with a distinct methylation episignature which can be used as a screening, diagnostic and classification tool for ZNF699 variants."

The largest cohort's summary of the inheritance and its intra-familial variability.

◈

Mechanistic Hypotheses

Loss of ZNF699-directed methylation at target loci mediates the malformation, neurodevelopmental and hematopoietic phenotypes

epigenetic_mediation EMERGING

Evidence balance 4 support

KRAB zinc finger proteins recruit the co-repressor KAP1 (TRIM28) through their KRAB domain, and KAP1 in turn deposits H3K9me3 and DNA methylation at the bound loci; DEGCAGS patients carry a robust blood methylation episignature. The hypothesis is that the episignature is the visible trace of a genome-wide loss of ZNF699-directed repression, and that derepression of specific target genes during development produces the phenotype. The 2024 cohort's differentially-methylated-region analysis pointed at genes plausibly involved in pathogenesis but did not test any. Against the hypothesis: the episignature is measured in blood leukocytes, not in the developing organs; the KRAB-KAP1 axis has been validated structurally and functionally for other KRAB zinc finger proteins (ZNF93) but never for ZNF699; and no ZNF699 target has been identified. The hypothesis predicts that ZNF699-null cells would show derepression and hypomethylation at a definable set of loci and that those loci would be enriched for developmental regulators of the affected organs.

Pathograph links

Aberrant Genome-wide DNA Methylation -> Disrupted Embryonic Organ Morphogenesis INDIRECT UNKNOWN INTERMEDIATES Hypothesised, not established; see the mechanistic hypothesis.

Aberrant Genome-wide DNA Methylation -> Impaired Neurodevelopment INDIRECT UNKNOWN INTERMEDIATES Hypothesised, not established; see the mechanistic hypothesis.

Aberrant Genome-wide DNA Methylation -> Impaired Hematopoiesis and Lymphocyte Development INDIRECT UNKNOWN INTERMEDIATES Hypothesised. The authors of the immunodeficiency report note that many episignature-bearing disorders also show immunodeficiency and raise an epigenetic contribution to inborn errors of immunity as a possibility.

Show evidence (4 references)

PMID:39424669 SUPPORT INDIRECT Human Clinical

"Analysis of differentially methylated regions suggested an effect on genes potentially implicated in the syndrome's pathogenesis."

The observation that motivates the hypothesis. INDIRECT because it is an enrichment in blood-derived DNA, not a demonstration of a target gene's role.

PMID:42534679 SUPPORT INDIRECT BACKGROUND Other

"The variant falls within the Krüppel-Associated Box (KRAB) domain, which plays a critical role in transcriptional repression"

The domain-level basis for expecting ZNF699 to act as a transcriptional repressor; restated background rather than a measurement.

PMID:36341546 SUPPORT INDIRECT BACKGROUND In Vitro

"KRAB domain-containing zinc finger proteins (KRAB-ZFPs) recruit the co-repressor KRAB-associated protein 1 (KAP1/TRIM28) to regulate many transposable elements, but how KRAB-ZFPs and KAP1 interact remains unclear."

The general KRAB-ZFP mechanism the hypothesis extrapolates from. INDIRECT because the study concerns ZNF93 and the KRAB family, not ZNF699.

+ 1 more reference

Discussions and Knowledge Gaps

What does ZNF699 bind, what does it repress, and in which developing tissues does its loss matter?

KNOWLEDGE GAP OPEN znf699_function_unknown

Attached to

pathophysiology#Biallelic ZNF699 Loss of Function pathophysiology#Disrupted Embryonic Organ Morphogenesis

Every mechanistic statement in this entry is an inference from protein family. ZNF699 is a KRAB zinc finger protein, so it is presumed to recruit KAP1-dependent repressive chromatin to a set of genomic targets, but no binding site, target gene or expression consequence has been reported, no animal or cellular model exists, and the only functional literature on the gene concerns ethanol tolerance in the distantly related Drosophila gene hangover and candidate-gene association with alcohol dependence. The founding report called for functional work in 2021 and none has appeared. Until it does, the pathograph cannot say why the gut, heart, kidney, limb, brain and marrow are the organs affected, or why the anomalies are discordant between siblings.

Proposed experiments

ZNF699 ChIP-seq and methylation profiling in ZNF699-null human iPSC-derived lineages

exp_degcags_znf699_null_ipsc_occupancy_methylation

Generate biallelic ZNF699 knockout iPSCs and profile ZNF699 genomic occupancy in the parental line, then compare DNA methylation and transcription at bound loci between null and parental cells differentiated toward intestinal, cardiac and hematopoietic lineages.

Would support

mechanistic_hypotheses#epigenetic_mediation

Supporting outcome

A definable set of ZNF699-bound loci that lose methylation and gain expression in null cells, enriched for developmental regulators of the affected organs, and overlapping the differentially methylated regions of the blood episignature.

Refuting outcome

No reproducible binding sites, or bound loci whose methylation and expression are unchanged in null cells, would indicate that the episignature is a downstream or cell-type-restricted consequence rather than the mechanism.

Show evidence (3 references)

PMID:39424669 SUPPORT Human Clinical

"ZNF699 encodes a KRAB zinc finger protein of unknown function."

The gap, stated by the largest cohort.

PMID:33875846 SUPPORT Human Clinical

"little is known about the function of this gene, which was initially described in Drosophila in a study of alcohol dependence."

The founding report's statement of the same gap and of the only prior literature.

PMID:42534679 SUPPORT Other

"no validated experimental system is currently available to functionally assess ZNF699"

Why missense variants are currently classified by episignature rather than by assay.

Why are the organ anomalies discordant between full siblings homozygous for the same ZNF699 allele, and what determines infant survival?

KNOWLEDGE GAP OPEN degcags_sibling_discordance_and_mortality

Attached to

pathophysiology#Disrupted Embryonic Organ Morphogenesis

The 2024 cohort makes discordance among full siblings and infant mortality defining features of the syndrome. The founding cohort recorded one evaluated child dead at nine months and eight infant deaths among siblings of the identified children, without their cause; eight of its thirteen patients carried the same c.436_439del allele with widely different anomaly sets, so the allele does not fix the phenotype. Stochastic developmental variation, modifier loci in these consanguineous pedigrees, or an environmental contribution are all open. No report has addressed which organ-system involvement predicts death, so the entry cannot connect infant mortality to any node, and because HPO's Death in infancy is a clinical-course term outside this schema's phenotype enum, the mortality is recorded here and in the description rather than as a phenotype.

Show evidence (3 references)

PMID:39424669 SUPPORT Human Clinical

"is caused by biallelic, loss-of-function (LoF) ZNF699 variants, and is characterized by variable neurodevelopmental disability, discordant organ anomalies among full siblings and infant mortality."

Discordance and infant mortality named together as defining features.

PMID:38014480 SUPPORT BACKGROUND Human Clinical

"identified 13 children from 12 consanguineous families who had DEGCAGS syndrome that proved to be variable in presentation and sufficiently severe that one evaluated child died prior to their report and eight siblings of the identified children died in infancy"

The sibling deaths in the founding cohort, as summarised in a later report's introduction.

PMID:39424669 SUPPORT Human Clinical

"a highly variable condition lacking pathognomonic clinical findings"

The authors' characterisation of the variability, and their motivation for seeking an episignature.

⚙

Pathophysiology

Biallelic ZNF699 Loss of Function

Homozygous or compound heterozygous frameshift, nonsense and rare missense variants abolish or disable the ZNF699 KRAB zinc finger protein. Nothing is known of the protein's targets: the KRAB domain implies transcriptional repression and the sixteen C2H2 zinc fingers imply sequence-specific DNA binding, and that is the extent of the mechanistic knowledge. The modifier on the bound process is therefore an inference from domain architecture, not a measurement, and no experimental system for ZNF699 exists.

ZNF699 hgnc:24750

Genetic context ZNF699 hgnc:24750 functional_impact_category: LOSS_OF_FUNCTION

KRAB-mediated transcriptional repression GO:0045892 ↓ DECREASED

Downstream

Aberrant Genome-wide DNA Methylation Biallelic loss of a KRAB zinc finger protein produces a reproducible blood DNA methylation episignature. The link is genotype-specific: heterozygous carriers cluster apart from both patients and controls.

Disrupted Embryonic Organ Morphogenesis The multi-organ malformations are the defining consequence of the genotype, but no intermediate step between the missing protein and the malformed organ has been identified.

Impaired Neurodevelopment

Impaired Hematopoiesis and Lymphocyte Development

Show evidence (5 references)

PMID:39424669 SUPPORT Human Clinical

"is caused by biallelic, loss-of-function (LoF) ZNF699 variants, and is characterized by variable neurodevelopmental disability, discordant organ anomalies among full siblings and infant mortality."

The mechanism as stated by the largest cohort.

PMID:39424669 SUPPORT Human Clinical

"ZNF699 encodes a KRAB zinc finger protein of unknown function."

The honest state of knowledge about the protein.

PMID:33875846 SUPPORT Human Clinical

"The gene encodes a large nuclear zinc-finger protein, suggesting a molecular role in nucleic acid binding."

The founding report's only functional statement, itself an inference from the protein family.

+ 2 more references

Aberrant Genome-wide DNA Methylation

Peripheral-blood DNA from patients carries a robust, specific methylation episignature that separates DEGCAGS from controls, from heterozygous carriers and from other episignature-bearing neurodevelopmental disorders. The signature is established as a diagnostic biomarker. Whether it also mediates the phenotype is not: the 2024 differentially-methylated-region analysis suggested effects on genes that could be relevant to pathogenesis, and that is where the evidence stops. The downstream edges from this node are therefore tagged with the epigenetic-mediation hypothesis rather than asserted.

Loss of ZNF699-directed methylation at target loci mediates the malformation, neurodevelopmental and hematopoietic phenotypes

peripheral blood leukocyte CL:0000738

genome-wide DNA methylation pattern GO:0040029 ⚠ ABNORMAL

Downstream

Disrupted Embryonic Organ Morphogenesis Hypothesised, not established; see the mechanistic hypothesis.

Impaired Neurodevelopment Hypothesised, not established; see the mechanistic hypothesis.

Impaired Hematopoiesis and Lymphocyte Development Hypothesised. The authors of the immunodeficiency report note that many episignature-bearing disorders also show immunodeficiency and raise an epigenetic contribution to inborn errors of immunity as a possibility.

Show evidence (3 references)

PMID:39424669 SUPPORT Human Clinical

"In nine individuals, methylation profiling of blood-DNA was performed, and a classification model was constructed to differentiate DEGCAGS from controls."

The profiling that defined the signature.

PMID:39424669 SUPPORT Human Clinical

"Analysis of differentially methylated regions suggested an effect on genes potentially implicated in the syndrome's pathogenesis."

The only statement connecting the methylation change to mechanism, phrased as a suggestion.

PMID:42534679 SUPPORT Human Clinical

"a high confidence match with an methylation variant pathogenicity (MVP) of 0.891 was found for the episignature associated with DEGCAGS"

Independent replication of the signature in a patient carrying a variant class (KRAB-domain missense) absent from the training set.

Disrupted Embryonic Organ Morphogenesis

Congenital anomalies of gut (jejunal and other intestinal atresia, pyloric stenosis), heart (septal defects, pulmonary valve stenosis or dysplasia, patent ductus), kidney and genitalia (renal hypoplasia or dysplasia, cryptorchidism, hypospadias, chordee, ambiguous genitalia), limbs (preaxial polydactyly, absent thumbs, syndactyly, talipes) and craniofacial skeleton, discordant in which organs are affected even between siblings sharing a genotype. The node is a tissue-level summary of a developmental failure whose molecular basis is unknown; each bound process is an organ system in which the cohorts document a malformation, with ABNORMAL rather than a direction because the anomalies span both hypoplasia and duplication.

embryonic organ development GO:0048568 ⚠ ABNORMAL heart development GO:0007507 ⚠ ABNORMAL kidney development GO:0001822 ⚠ ABNORMAL skeletal system development GO:0001501 ⚠ ABNORMAL

Downstream

Intestinal atresia

Pyloric stenosis

Atrial septal defect

Pulmonic stenosis

Patent ductus arteriosus

Renal hypoplasia

Cryptorchidism

Hypospadias

Ambiguous genitalia

Preaxial polydactyly

Absent thumb

Syndactyly

Talipes equinovarus

Coarse facial features

Thick eyebrow

Synophrys

Long eyelashes

Smooth philtrum

Micrognathia

Thin upper lip vermilion

Craniosynostosis

Laryngomalacia

Tracheomalacia

Hamartoma

Taurodontia

Show evidence (3 references)

PMID:33875846 SUPPORT Human Clinical

"Patients presented with a severe phenotype that included congenital heart defects, gastrointestinal (intestinal atresia, pyloric stenosis, GER, hepatosplenomegaly), genitourinary (renal hypoplasia, cryptorchidism, chordee, hypospadias, ambiguous genitalia), and skeletal abnormalities (preaxial..."

The organ-system inventory of the founding cohort.

PMID:39424669 SUPPORT Human Clinical

"discordant organ anomalies among full siblings"

The intra-familial discordance that makes this a variable developmental failure rather than a fixed malformation pattern.

PMID:35205213 SUPPORT Human Clinical

"Dysmorphic features (coarse facial, thick eyebrows, nose abnormalities, syndactyly), intestinal atresia that requires operation in the first days of life, and congenital heart defects (in general) seem to be the specific major symptoms that could be helpful to suspect the DEGCAGS syndrome in the..."

The fourteen-patient synthesis of which malformations are most characteristic.

Impaired Neurodevelopment

Severe global developmental delay with intellectual disability and central hypotonia in every reported patient, microcephaly in about half, sensorineural hearing loss in a minority, and non-specific white matter change on imaging (punctate non-hemorrhagic white matter lesions, periventricular echogenicity, ventricular enlargement, in one case agenesis of the corpus callosum). The 2024 cohort describes the presentation as age-related, and the one adult reported had a borderline IQ, so the severity range is wider than the infant cohorts suggested.

neuron CL:0000540

nervous system development GO:0007399 ⚠ ABNORMAL

Downstream

Global developmental delay

Intellectual disability

Generalized hypotonia

Microcephaly

Sensorineural hearing impairment

Abnormal cerebral white matter morphology

Agenesis of corpus callosum

Ventriculomegaly

Strabismus

Show evidence (3 references)

PMID:33875846 SUPPORT Human Clinical

"All patients presented severe NDD."

Universality of the neurodevelopmental phenotype in the founding cohort.

PMID:39424669 SUPPORT Human Clinical

"show that biallelic, LoF, ZNF699 variants cause unique clinical findings with age-related presentation and a similar facial gestalt"

The age-dependence of the presentation in the 30-patient cohort.

PMID:38014480 SUPPORT Human Clinical

"MRI scan showed non-hemorrhagic punctate white matter densities without anatomic brain abnormalities"

The imaging correlate in a profoundly hypotonic neonate; notable for how little structural change accompanied the clinical severity.

Impaired Hematopoiesis and Lymphocyte Development

Anemia or pancytopenia in over half of the founding cohort, leukopenia in later cases, and one patient investigated for suspected inherited bone marrow failure. The immune arm was first characterised in 2026 in a 20-year-old with recurrent severe lower respiratory infection and bronchiectasis: near-absent circulating B cells, reduced naive CD4 and CD8 T cells, impaired mitogen response and reduced kappa-deleting recombination excision circles, with normal immunoglobulins and vaccine responses, meeting ESID criteria for combined immunodeficiency. Immunodeficiency or recurrent infection is reported in about two fifths of patients. Whether the defect is one of hematopoietic stem cell output or of lineage-specific lymphocyte development is not known; the 2025 bone marrow failure report is said to have raised an RNA polymerase II and ribosome biogenesis analogy, but its abstract is not in the cache and that proposal is not curated here.

hematopoietic stem cell CL:0000037 B cell CL:0000236 naive T cell CL:0000898

hemopoiesis GO:0030097 ↓ DECREASED

Downstream

Anemia

Pancytopenia

Decreased total B cell count

Decreased naive CD4+ T cell proportion

Decreased naive CD8+ T cell proportion

Immunodeficiency

Combined immunodeficiency

Recurrent infections

Show evidence (3 references)

PMID:42534679 SUPPORT Human Clinical

"The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"

The measured lymphocyte compartments in the first immunologically characterised patient.

PMID:42534679 SUPPORT BACKGROUND Human Clinical

"Immunodeficiency and/or recurrent infections are reported in 42.3% of patients"

The cohort frequency of the immune phenotype, as the immunology report summarises the 2024 cohort.

PMID:35205213 SUPPORT Human Clinical

"In the laboratory findings, the most frequently reported deviation was in the complete blood count (8/14), two patients had pancytopenia, and six patients had anemia."

Frequency of cytopenias across the first fourteen patients.

⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.

●

Phenotypes

Blood 5

Anemia FREQUENT HP:0001903

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"In the laboratory findings, the most frequently reported deviation was in the complete blood count (8/14), two patients had pancytopenia, and six patients had anemia."

Six of fourteen.

Pancytopenia OCCASIONAL HP:0001876

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"complete blood count (8/14), two patients had pancytopenia, and six patients had anemia"

Two of fourteen.

PMID:33875846 SUPPORT Human Clinical

"Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."

Listed as a common feature.

Decreased total B cell count VERY_RARE HP:0010976

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"

The B-cell measurement.

Decreased naive CD4+ T cell proportion VERY_RARE HP:0410378

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"

Naive CD4 T cells at 12 percent, in a single patient.

Decreased naive CD8+ T cell proportion VERY_RARE HP:0410377

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"

Naive CD8 T cells at 42 percent, in the same single patient.

Cardiovascular 5

Hepatosplenomegaly OCCASIONAL HP:0001433

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"nystagmus, syndactyly, intellectual disability, hepatosplenomegaly, failure to thrive"

Hepatosplenomegaly among patient 27's HPO terms; patient 26 carries hepatomegaly.

PMID:33875846 SUPPORT Human Clinical

Listed among the gastrointestinal features of the founding cohort.

Atrial septal defect OCCASIONAL HP:0001631

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"Atrial septal defect (2/14), pulmonic stenosis (2/14) and individual cases of persistent left superior vena cava, ventricular septal defect, dysplastic pulmonary valve, patent formanem ovale, and patent ductus arteriosus."

The cardiac inventory of the first fourteen patients.

Pulmonic stenosis OCCASIONAL HP:0001642

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

Two of fourteen.

Patent ductus arteriosus OCCASIONAL HP:0001643

Show evidence (2 references)

PMID:38014480 SUPPORT Human Clinical

"a patent ductus arteriosus was noted on screening echocardiogram"

A hemodynamically insignificant PDA in the Middle Eastern patient.

PMID:41205195 SUPPORT Human Clinical

"The patient's past medical history included leukopenia, recurrent pneumonia, immunodeficiency, patent ductus arteriosus, and patent foramen ovale."

PDA in the Chinese airway patient.

Retinal vascular tortuosity VERY_RARE HP:0012841

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"Other features included bilateral pyelectasis, left ventricular hypertrabeculation, hypermetropia, increased retinal vessel tortuosity, and hyperemic optic disc with blurred margins."

Retinal vessel tortuosity in the adult patient.

Digestive 3

Intestinal atresia FREQUENT HP:0011100

Sequelae: Feeding difficulties

Show evidence (3 references)

PMID:35205213 SUPPORT Human Clinical

"Intestinal atresia was observed in nine patients and was a reason for multiply operations."

Nine of fourteen, and the surgical burden.

PMID:35205213 SUPPORT Human Clinical

"The patient had a laparotomy with a massive short bowel resection (due to a multi-level obstruction of the jejunum-intestinal atresia) with one anastomosis on day 5 of life."

The presentation and surgery in the Polish patient.

PMID:33875846 SUPPORT Human Clinical

"| 30 | ZNF699 | NM_198535.2 : c.349dupA | p.Ile117fs | Hom | Yes, yes | Syndactyly, muscular hypotonia, intrauterine growth retardation, premature birth, abnormal facial shape, congenital onset, intestinal atresia |"

Table 1 row for patient 30; jejunal or intestinal atresia is listed on patients 26, 29, 31, 32, 35, 36 and 38 as well.

Pyloric stenosis OCCASIONAL HP:0002021

Show evidence (1 reference)

PMID:33875846 SUPPORT Human Clinical

Pyloric stenosis among the gastrointestinal anomalies of the founding cohort.

Feeding difficulties OCCASIONAL HP:0011968

Sequelae: Failure to thrive

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"There were also feeding difficulties (4/14), and patients required nasogastric tube feeding."

Four of fourteen.

PMID:38014480 SUPPORT Human Clinical

"at the age of 75 days, he received a tracheostomy and gastrostomy tube with fundoplication"

Gastrostomy with fundoplication for aspiration and reflux.

Ear 1

Sensorineural hearing impairment OCCASIONAL HP:0000407

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"Sensorineural hearing impairment was observed in four patients."

Four of fourteen.

PMID:33875846 SUPPORT Human Clinical

"Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."

Listed among the common features of the founding cohort.

Eye 2

Strabismus OCCASIONAL HP:0000486

Show evidence (2 references)

PMID:38014480 SUPPORT Human Clinical

"He had exotropia in primary gaze"

The strabismus finding.

PMID:38014480 SUPPORT Human Clinical

"He had torpedo-like maculopathy changes in both eyes with increased cupping of the optic disks."

The retinal findings reported alongside it, which have no more specific HPO binding in this entry.

Ptosis OCCASIONAL HP:0000508

Show evidence (2 references)

PMID:38014480 SUPPORT Human Clinical

"He had bilateral ptosis with infrequent and incomplete blinking bilaterally in early infancy"

The ptosis observation.

PMID:38014480 SUPPORT Human Clinical

"The child reported here had bilateral partial ptosis and some limitation of adduction OU, possibly implying a synaptic problem."

The authors' alternative mechanistic reading, which is why the ptosis is left unconnected in the pathograph.

Genitourinary 5

Renal hypoplasia OCCASIONAL HP:0000089

Sequelae: Chronic kidney disease

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"Renal hypoplasia (3/14), cryptorchidism (3/14), chronic kidney disease (2/14), and ambiguous (2/14), hypospadias (1/14), and chordee (1/14) were the observed symptoms from the genitourinary system."

The genitourinary inventory of the first fourteen patients.

Chronic kidney disease OCCASIONAL HP:0012622

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"cryptorchidism (3/14), chronic kidney disease (2/14), and ambiguous (2/14)"

Two of fourteen.

Cryptorchidism OCCASIONAL HP:0000028

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"Renal hypoplasia (3/14), cryptorchidism (3/14), chronic kidney disease (2/14)"

Three of fourteen.

PMID:38014480 SUPPORT Human Clinical

"He had good urine output, but testes were undescended bilaterally."

Bilateral cryptorchidism in a later case.

Hypospadias OCCASIONAL HP:0000047

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"hypospadias (1/14), and chordee (1/14)"

One of fourteen, with chordee.

Ambiguous genitalia OCCASIONAL HP:0000062

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"Renal hypoplasia (3/14), cryptorchidism (3/14), chronic kidney disease (2/14), and ambiguous (2/14), hypospadias (1/14), and chordee (1/14) were the observed symptoms from the genitourinary system."

Ambiguous genitalia in two of fourteen.

PMID:33875846 SUPPORT Human Clinical

"| 35 | ZNF699 | NM_198535.2 : c.436_439del | p.Asp146Ilefs*10 | Hom | Yes, no | Abnormal facial shape, abnormal myelination, absent thumb, ambiguous genitalia"

Table 1 row for patient 35.

Head and Neck 12

Microcephaly FREQUENT HP:0000252

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"All patients had dysmorphic features, which included: An abnormal facial shape (9/14), microcephaly (6/14), long eyelashes (4/14), abnormal eyebrows (thick or unibrow, 4/14), nose abnormalities (prominent nasal bridge, upturned nose, short nose, 5/14)"

Six of fourteen.

PMID:41205195 SUPPORT Human Clinical

"Clinical evaluation revealed microcephaly, coarse facial features, oropharyngeal masses, and developmental delay."

A later case with the same combination.

Coarse facial features FREQUENT HP:0000280

Show evidence (4 references)

PMID:33875846 SUPPORT Human Clinical

"Patient 27, male index has low anterior hairline, thick scalp hair, thick eyebrows, synophrys, long eyelashes, long palpebral fissures, proptosis, strabismus, bulbous nose, low hanging columella, smooth philtrum, wide mouth, micrognathia, short neck, brachydactyly, right preaxial polydactyly,..."

The full facial description of an index patient.

PMID:42569837 SUPPORT BACKGROUND Human Clinical

"In this cohort, patients exhibited coarse facial features, often accompanied by microcephaly, as well as prematurely graying hair"

A later report summarising the founding cohort's facial phenotype.

PMID:39424669 SUPPORT Human Clinical

"GestaltMatcher analyzed fifty-three facial photographs from five individuals."

The computational facial analysis behind the claim of a shared gestalt; it supports consistency of the gestalt, not its frequency.

+ 1 more reference

Thick eyebrow OCCASIONAL HP:0000574

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"abnormal eyebrows (thick or unibrow, 4/14)"

Four of fourteen, thick eyebrows and synophrys counted together.

PMID:33875846 SUPPORT Human Clinical

"Patient 27, male index has low anterior hairline, thick scalp hair, thick eyebrows, synophrys, long eyelashes"

Thick eyebrows in an index patient of the founding cohort.

Synophrys OCCASIONAL HP:0000664

Show evidence (3 references)

PMID:33875846 SUPPORT Human Clinical

"Patient 27, male index has low anterior hairline, thick scalp hair, thick eyebrows, synophrys, long eyelashes"

Synophrys in patient 27; it is also listed among patient 31's HPO terms in Table 1.

PMID:42569837 SUPPORT Human Clinical

"Clinical examination revealed hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip, increased overjet, and deep bite."

Synophrys in the 10-year-old Brazilian patient.

PMID:35205213 SUPPORT Human Clinical

"abnormal eyebrows (thick or unibrow, 4/14)"

The combined count that sets the OCCASIONAL band.

Long eyelashes OCCASIONAL HP:0000527

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"microcephaly (6/14), long eyelashes (4/14), abnormal eyebrows (thick or unibrow, 4/14)"

Four of fourteen.

Smooth philtrum OCCASIONAL HP:0000319

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"| 26 | ZNF699 | NM_198535.2 : c.436_439del | p.Asp146Ilefs*10 | Hom | Yes, yes | High palate, coarse facial features, smooth philtrum"

Table 1 row for patient 26; also listed for patient 27 and in the 2026 dental report.

PMID:42569837 SUPPORT Human Clinical

"Clinical examination revealed hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip, increased overjet, and deep bite."

Smooth philtrum with thin upper lip in the 10-year-old.

Micrognathia OCCASIONAL HP:0000347

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"The infant was noticed to have dysmorphic features such as: a Saddle nose, low-set ears, retrognathia with micrognathia, suspicion of bilateral atresia of the external auditory canals, doubling of the right thumb"

Neonatal dysmorphology of the Polish patient.

PMID:33875846 SUPPORT Human Clinical

"| 36 | ZNF699 | NM_198535.2 : c.51_54delCTCA | p.Asp17fs | Hom | Yes, yes | Cryptorchidism, chordee, ambiguous genitalia, abnormality of the face, micrognathia, low-set ears, syndactyly, craniosynostosis"

Table 1 row for patient 36.

Thin upper lip vermilion OCCASIONAL HP:0000219

PMID:33875846 contradicts itself on patient 35: Table 1 lists "thick vermilion border" as an HPO term, while Figure 3 legend describes a photograph and states "thin vermilion of the upper lip". This entry follows the figure legend, which describes a photographic record, over the Table 1 categorization. The phenotype claim does not depend on patient 35; the second citation (PMID:42569837) is an independent patient in a different paper.

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"Patient 35, male index with coarse face, broad eyebrows, long palpebral fissures, wide mouth, thin vermilion of the upper lip, and bilateral absent thumbs."

Figure 3 legend describes thin upper vermilion in patient 35 (from photographic record). Note: the same paper lists patient 35 with "thick vermilion border" in Table 1 HPO terms; this entry follows the figure legend description.

PMID:42569837 SUPPORT Human Clinical

"Clinical examination revealed hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip, increased overjet, and deep bite."

Thin upper lip in the 10-year-old.

Dolichocephaly VERY_RARE HP:0000268

Show evidence (1 reference)

PMID:42569837 SUPPORT Human Clinical

"These included hair thinning, dolichocephaly, mandibular retrognathism associated with micrognathia, and increased overjet."

The extraoral examination.

Craniosynostosis VERY_RARE HP:0001363

Show evidence (1 reference)

PMID:33875846 SUPPORT Human Clinical

"micrognathia, low-set ears, syndactyly, craniosynostosis, patent foramen ovale"

Craniosynostosis among patient 36's HPO terms; a single patient.

Taurodontia VERY_RARE HP:0000679

Show evidence (2 references)

PMID:42569837 SUPPORT Human Clinical

"Radiographic evaluation revealed taurodontism, particularly in teeth 16 and 26, shortened roots in the mandibular incisors, and increased pericoronal space associated with developing teeth."

The radiographic dental findings.

PMID:42569837 SUPPORT Human Clinical

"Intraoral findings included generalized spacing, gingivitis, active carious lesions, hypomineralization of primary molars, talon cusps on the maxillary central incisors, erosive tooth wear, and signs consistent with sleep bruxism."

The intraoral findings.

Enamel hypomineralization VERY_RARE HP:0006285

Show evidence (1 reference)

PMID:42569837 SUPPORT Human Clinical

Hypomineralization of the primary molars.

Immune 3

Combined immunodeficiency VERY_RARE HP:0005387

Sequelae: Recurrent infections

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"Based on infectious history and immunological findings, a diagnosis of combined immunodeficiency (CID) was made according to European Society for Immunodeficiencies (ESID) criteria."

The formal diagnosis.

Immunodeficiency OCCASIONAL HP:0002721

Sequelae: Recurrent infections

Show evidence (3 references)

PMID:35205213 SUPPORT Human Clinical

"Five patients had recurrent infections, of those, two had confirmed immunodeficiency."

Two of fourteen with confirmed immunodeficiency in the early cohort.

PMID:33875846 SUPPORT Human Clinical

"immunodeficiency, tracheomalacia, bronchomalacia, chronic lung disease, short thumb, intestinal atresia, feeding difficulties, bilateral renal dysplasia, chronic kidney disease"

Immunodeficiency among patient 29's HPO terms; also listed for patient 37.

PMID:41205195 SUPPORT Human Clinical

"The patient's past medical history included leukopenia, recurrent pneumonia, immunodeficiency, patent ductus arteriosus, and patent foramen ovale."

Immunodeficiency with leukopenia in the Chinese airway patient.

Recurrent infections FREQUENT HP:0002719

Sequelae: Bronchiectasis

Show evidence (3 references)

PMID:35205213 SUPPORT Human Clinical

"Five patients had recurrent infections, of those, two had confirmed immunodeficiency."

Five of fourteen.

PMID:42534679 SUPPORT BACKGROUND Human Clinical

"Immunodeficiency and/or recurrent infections are reported in 42.3% of patients"

The 2024 cohort frequency, as summarised by the immunology report.

PMID:35205213 SUPPORT Human Clinical

"Due to severe infections (SARS-CoV-2 and three bacterial sepsis), the girl was hospitalized in the ICU."

Three episodes of bacterial sepsis in the first year of life.

Integument 1

Premature graying of hair OCCASIONAL HP:0002216

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."

Listed as a common feature.

PMID:42534679 SUPPORT Human Clinical

"Clinical examination revealed premature hair graying, sunken and hypermetropic eyes, hypotelorism, small dysmorphic ears, beak-shaped nose, nail dystrophy, hyperpigmentation of the neck and periumbilical and axillary regions, obesity, stature at the lowest limit of the midparental height,..."

Premature graying persisting into the adult phenotype.

Limbs 4

Syndactyly FREQUENT HP:0001159

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"Skeletal anomalies included syndactyly (7/14), polydactyly (2/14), brachydactyly, absent thumbs, talipes equinovarus, and genu valgum."

Seven of fourteen.

Preaxial polydactyly OCCASIONAL HP:0100258

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"Skeletal anomalies included syndactyly (7/14), polydactyly (2/14), brachydactyly, absent thumbs"

Two of fourteen.

PMID:33875846 SUPPORT Human Clinical

"right preaxial polydactyly, and bilateral syndactyly of the second and third toes"

Patient 27's limb findings.

Absent thumb OCCASIONAL HP:0009777

Show evidence (1 reference)

PMID:33875846 SUPPORT Human Clinical

"Patient 35, male index with coarse face, broad eyebrows, long palpebral fissures, wide mouth, thin vermilion of the upper lip, and bilateral absent thumbs."

Bilateral absent thumbs in patient 35.

Talipes equinovarus OCCASIONAL HP:0001762

Show evidence (2 references)

PMID:38014480 SUPPORT Human Clinical

"He had bilateral talipes equinovarus, congenital vertical talus bilaterally, rocker bottom feet (Figure 2), long fingers, contractures of both elbows and both knees, and syndactyly of the third and fourth toes bilaterally."

Bilateral clubfoot with vertical talus and joint contractures.

PMID:35205213 SUPPORT Human Clinical

"Skeletal anomalies included syndactyly (7/14), polydactyly (2/14), brachydactyly, absent thumbs, talipes equinovarus, and genu valgum."

Talipes among the skeletal anomalies of the first fourteen.

Musculoskeletal 1

Generalized hypotonia FREQUENT HP:0001290

Show evidence (3 references)

PMID:35205213 SUPPORT Human Clinical

"Muscular hypotonia was present in seven patients."

Seven of fourteen, the basis for FREQUENT.

PMID:33875846 SUPPORT Human Clinical

"Other recurrent features were generalized hypotonia, sensorineural hearing impairment, and premature hair graying."

Listed as a recurrent feature of the founding cohort.

PMID:38014480 SUPPORT Human Clinical

"The child had striking diffuse hypotonia at birth with very little movement of any part of his body except his eyes and with no evidence of spasticity or hyperreflexia."

The severe end of the hypotonia spectrum, and its central, non-spastic character.

Nervous System 5

Global developmental delay OBLIGATE HP:0001263

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"All patients presented severe NDD."

Universal in the founding cohort.

PMID:42569837 SUPPORT BACKGROUND Human Clinical

"All individuals presented severe global developmental delay with significant intellectual impairment and hypotonia"

A later report's summary of the founding cohort's neurodevelopmental phenotype.

Intellectual disability VERY_FREQUENT HP:0001249

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"| 27 | ZNF699 | NM_198535.2 : c.1623_1626delTTAT | p.Tyr542fs | Hom | Yes, no | Wide mouth, microcephaly, abnormality of the face, smooth philtrum, micrognathia, abnormal electroretinogram, long eyelashes, nystagmus, syndactyly, intellectual disability"

Table 1 row listing intellectual disability among the HPO terms of patient 27; the same term appears on patients 28, 29, 33 and 37.

PMID:42534679 SUPPORT Human Clinical

"He also had a history of cryptorchidism, feeding difficulties, hypotonia, developmental delay and borderline IQ score (IQ 77)"

The mildest cognitive outcome reported, in the only adult.

Abnormal cerebral white matter morphology OCCASIONAL HP:0002500

Show evidence (2 references)

PMID:38014480 SUPPORT Human Clinical

"MRI scan showed non-hemorrhagic punctate white matter densities without anatomic brain abnormalities"

The MRI finding at 8 days of life.

PMID:35205213 SUPPORT Human Clinical

"In the ultrasonography of the brain, higher echogenicity of periventricular white matter was found."

The ultrasound correlate in the Polish patient.

Agenesis of corpus callosum VERY_RARE HP:0001274

Show evidence (1 reference)

PMID:33875846 SUPPORT Human Clinical

"single umbilical artery, global developmental delay, agenesis of corpus callosum, cholestasis, vocal cord paralysis"

Agenesis of the corpus callosum among patient 26's HPO terms; a single patient.

Ventriculomegaly OCCASIONAL HP:0002119

Show evidence (2 references)

PMID:33875846 SUPPORT Human Clinical

"sacral dimple, short nose, small for gestational age, thick vermilion border, ventriculomegaly, wide intermammary distance"

Ventriculomegaly among patient 35's HPO terms.

PMID:35205213 SUPPORT Human Clinical

"Computer tomography of the brain showed widening of the ventricular system and enlarged post-cerebral fluid space as in atrophy."

The CT finding in the Polish patient.

Prenatal and Birth 2

Polyhydramnios FREQUENT HP:0001561

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"Less than half of the pregnancies (6/14) were complicated by at least one of the following: Intrauterine growth retardation (5/14), polyhydramnios (5/14), single umbilical artery (2/14), and premature birth (5/14)."

Five of fourteen.

PMID:35205213 SUPPORT Human Clinical

"The pregnancy was complicated with polyhydroamniosis, single umbilical artery, and fetal ileus diagnosed prenatally."

Polyhydramnios alongside prenatally detected fetal ileus in the Polish patient, quoted with the source's spelling.

Premature birth FREQUENT HP:0001622

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

Five of fourteen.

PMID:33875846 SUPPORT Human Clinical

Premature birth among patient 30's HPO terms; also listed for patients 26 and 35.

Respiratory 4

Bronchiectasis VERY_RARE HP:0002110

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"High-resolution computed tomography scan revealed bilateral diffuse bronchiectasis, bronchiolectasis, and obliterans bronchiolitis."

Bilateral bronchiectasis in the single adult reported.

Laryngomalacia OCCASIONAL HP:0001601

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"In the respiratory tract, abnormalities concerned laryngomalacia, tracheomalacia, and bronchomalacia."

The airway inventory of the first fourteen patients.

PMID:41205195 SUPPORT Human Clinical

"Fiberoptic nasopharyngoscopy demonstrated bilateral vocal cord dysfunction and laryngomalacia."

Endoscopically confirmed laryngomalacia with vocal cord dysfunction.

Tracheomalacia OCCASIONAL HP:0002779

Show evidence (1 reference)

PMID:33875846 SUPPORT Human Clinical

"immunodeficiency, tracheomalacia, bronchomalacia, chronic lung disease, short thumb, intestinal atresia, feeding difficulties, bilateral renal dysplasia, chronic kidney disease"

Patient 29's HPO terms; tracheomalacia is also listed for patient 38.

Neonatal respiratory distress OCCASIONAL HP:0002643

Show evidence (2 references)

PMID:38014480 SUPPORT Human Clinical

"Post-partum medical problems included hypotension, generalized hypotonia, bradycardia, apnea requiring resuscitation and positive pressure ventilation, facial dysmorphia, skeletal malformations, and disorders of the gastrointestinal, immune, urinary, respiratory, cardiac, and visual systems."

The neonatal course of the Middle Eastern patient.

PMID:35205213 SUPPORT Human Clinical

"Shortly after birth, the patient required respiratory resuscitation, facial CPAP, and on the first day of life, was transferred to Newborn Intensive Care Unit (NICU) due to the severe general condition."

Resuscitation and CPAP at birth in the Polish patient.

Growth 2

Failure to thrive FREQUENT HP:0001508

Show evidence (2 references)

PMID:35205213 SUPPORT Human Clinical

"Eight patients had a failure to thrive, which may be primary or secondary to symptoms from the gastrointestinal or cardiovascular systems."

Eight of fourteen.

PMID:33875846 SUPPORT Human Clinical

"He presented generalized hypotonia and was severely emaciated. The patient deceased at 9 months old."

The most severe growth outcome in the founding cohort.

Intrauterine growth retardation FREQUENT HP:0001511

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

Five of fourteen, with the co-occurring prenatal complications.

Neoplasm 1

Hamartoma VERY_RARE HP:0010566

Show evidence (2 references)

PMID:41205195 SUPPORT Human Clinical

"Surgical resection of nasopharyngeal and tongue-base masses with supraglottoplasty was performed. Histopathology confirmed hamartomas."

Histological confirmation of the resected masses.

PMID:41205195 SUPPORT Human Clinical

"presented with progressive stridor, hoarseness, respiratory distress, and feeding difficulties since birth"

The presentation.

🧬

Genetic Associations

ZNF699

Gene: ZNF699 hgnc:24750 relationship_type: CAUSATIVE

Show evidence (7 references)

PMID:33875846 SUPPORT Human Clinical

"Thirteen patients from 12 families were identified with homozygous loss-of-function (LoF) variants in this gene (Fig. 3)."

The founding gene-disease association.

PMID:33875846 SUPPORT Human Clinical

"| 26 | ZNF699 | NM_198535.2 : c.436_439del | p.Asp146Ilefs*10 | Hom |"

Table 1 row for the recurrent founding allele.

PMID:35205213 SUPPORT Human Clinical

"two nonsense variants in compound heterozygote state in ZNF699 gene (NM_198535.3) were prioritized for further investigation: (hg 38, chr19:g.009296869-G>A; c.535C>T/p.Gln179Ter) and (hg38, chr19:g.009296077-G>A; c.1327C>T/p.Arg443Ter)."

The compound heterozygous nonsense genotype.

+ 4 more references

Variants (5)

NM_198535.2:c.436_439del p.(Asp146Ilefs*10)

The recurrent allele of the founding cohort, homozygous in eight of the thirteen patients across several families.

NM_198535.2:c.1623_1626delTTAT p.(Tyr542fs)

Homozygous frameshift in two siblings of the founding cohort.

NM_198535.3:c.535C>T p.(Gln179Ter) / c.1327C>T p.(Arg443Ter)

Compound heterozygous nonsense variants in the first non-consanguineous patient, one inherited from each parent.

c.1379C>T p.(Ser460Leu)

Homozygous missense variant in the first patient with detailed ophthalmological documentation.

c.153C>A p.(Asn51Lys)

Homozygous missense variant within the KRAB domain, the first reported there, in a young adult with combined immunodeficiency; classified as a VUS by ACMG criteria and supported by a high-confidence episignature match.

💊

Medical Actions

Surgical Repair of Intestinal Atresia

Action: laparotomy with intestinal resection and anastomosis Ontology label: Surgical Procedure NCIT:C15329

Platform: Surgery

Laparotomy with resection and anastomosis for jejunal or multilevel intestinal atresia in the first days of life, with repeat operations for adhesions and anastomotic narrowing in some patients. Intestinal atresia was the reason for multiple operations in nine of the first fourteen patients.

Mechanism Target:

Intestinal atresia

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"The patient had a laparotomy with a massive short bowel resection (due to a multi-level obstruction of the jejunum-intestinal atresia) with one anastomosis on day 5 of life."

The index surgery in the Polish patient.

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"The patient underwent two more laparotomies due to digestive tract passage disorders, during which abdominal adhesions were removed and the anastomosis was resected due to its narrowing."

The reoperation burden.

Parenteral and Enteral Nutritional Support

Action: parenteral and tube nutritional support Ontology label: Nutritional Support NCIT:C15433

Total parenteral nutrition with trophic naso-intestinal feeding after short bowel resection, nasogastric feeding for poor suck and dysphagia, and gastrostomy with fundoplication for aspiration and reflux.

Mechanism Target:

Feeding difficulties

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"Due to feeding intolerance, total parental nutrition was required all the time, the patient received trophic nutrition through a naso-intestinal tube."

Parenteral nutrition for feeding intolerance.

Show evidence (1 reference)

PMID:38014480 SUPPORT Human Clinical

"at the age of 75 days, he received a tracheostomy and gastrostomy tube with fundoplication"

Gastrostomy with fundoplication in the ventilator-dependent infant.

Airway Surgery for Laryngeal Hamartoma

Action: hamartoma resection with supraglottoplasty Ontology label: Surgical Procedure NCIT:C15329

Platform: Surgery

Resection of nasopharyngeal and tongue-base hamartomas with supraglottoplasty, after which the infant achieved stable respiration and normal feeding with no recurrence at two months. A single case.

Mechanism Target:

Hamartoma

Show evidence (1 reference)

PMID:41205195 SUPPORT Human Clinical

"Surgical resection of nasopharyngeal and tongue-base masses with supraglottoplasty was performed."

The procedure.

Laryngomalacia

Show evidence (1 reference)

PMID:41205195 SUPPORT Human Clinical

"Fiberoptic nasopharyngoscopy demonstrated bilateral vocal cord dysfunction and laryngomalacia."

The supraglottoplasty component addressed the coexisting laryngomalacia.

Show evidence (1 reference)

PMID:41205195 SUPPORT Human Clinical

"Postoperatively, the patient required transient ICU support but achieved stable respiration and normal feeding by discharge."

The outcome.

Antibiotic Treatment of Recurrent Infections

Action: antibiotic therapy Ontology label: Antibiotic Therapy NCIT:C15620

Platform: Small molecule

Repeated courses of antibiotics and hospital admission for recurrent sinopulmonary infection and, in infancy, bacterial sepsis. No report describes immunoglobulin replacement or prophylaxis, which is consistent with the one characterised patient having normal immunoglobulins and vaccine responses.

Mechanism Target:

Recurrent infections

Show evidence (1 reference)

PMID:42534679 SUPPORT Human Clinical

"recurrent upper and lower respiratory infections requiring frequent antibiotic treatments and hospital admissions"

Antibiotic treatment of the recurrent infections.

Multidisciplinary Supportive Care

Action: multidisciplinary supportive care Ontology label: Supportive Care NCIT:C15747

Intensive care and tracheostomy for neonatal respiratory failure, transfusion for anemia, and long-term multidisciplinary follow-up spanning neurology, ophthalmology, genetics, nutrition and rehabilitation. There is no disease-modifying therapy.

Mechanism Target:

Neonatal respiratory distress

Show evidence (1 reference)

PMID:35205213 SUPPORT Human Clinical

"During one of the ICU stays, a tracheostomy was developed due to respiratory failure."

Tracheostomy for respiratory failure.

Show evidence (2 references)

PMID:41205195 SUPPORT Human Clinical

"underscores the importance of a multidisciplinary approach to diagnosis and management"

The management principle the airway report draws.

PMID:38014480 SUPPORT Human Clinical

"He developed neonatal jaundice that was treated with phototherapy, and anemia was treated with packed red blood cell transfusions."

Transfusion for anemia in the neonatal period.

🔬

Biochemical Markers

DEGCAGS blood DNA methylation episignature (PRESENT)

Context: Peripheral-blood genome-wide DNA methylation biomarker used to screen for, diagnose and classify ZNF699 variants; established as a diagnostic classifier, not as a causal mediator or severity marker.

Pathograph Readouts

Readout Of Biallelic ZNF699 Loss of Function Present Absent Diagnostic

Show evidence (1 reference)

PMID:39424669 SUPPORT Human Clinical

The episignature reads out the biallelic genotype and is offered as a variant classifier.

Show evidence (2 references)

PMID:39424669 SUPPORT Human Clinical

"We also identified a robust episignature for DEGCAGS syndrome."

Discovery of the signature in nine profiled patients.

PMID:42534679 SUPPORT Human Clinical

"a high confidence match with an methylation variant pathogenicity (MVP) of 0.891 was found for the episignature associated with DEGCAGS"

Independent diagnostic use, resolving a KRAB-domain missense VUS that exome analysis had twice missed.

🔬

Diagnosis

Molecular genetic testing for biallelic ZNF699 variants

Diagnosis is by identification of biallelic pathogenic ZNF699 variants, in practice by exome or genome sequencing. Because the gene-disease association dates from 2021, exomes analysed before then and clinical-exome panels that omit ZNF699 can miss it, and reanalysis is warranted in undiagnosed patients with a compatible phenotype.

molecular genetic testing NCIT:C15709

Results: Biallelic loss-of-function or episignature-supported missense ZNF699 variants establish the molecular diagnosis.

Show evidence (2 references)

PMID:41205195 SUPPORT Human Clinical

"A 1-year-old girl with DEGCAGS syndrome (confirmed by ZNF699 mutation via whole-exome sequencing)"

Exome-based confirmation in a later case.

PMID:42534679 SUPPORT Human Clinical

"This evidence further emphasizes the importance of reanalysis of results of genetic testing over time."

The lesson of a patient whose 2018 exome and 2022 clinical exome both missed ZNF699.

DNA methylation episignature analysis

Genome-wide blood DNA methylation profiling against the DEGCAGS episignature classifies patients from controls and carriers and can resolve a ZNF699 variant of uncertain significance, which matters because no functional assay for the protein exists. The signature is offered as a screening, diagnostic and classification tool.

genome-wide DNA methylation episignature analysis NCIT:C63328

Results: A high-confidence match to the DEGCAGS episignature supports pathogenicity of a candidate ZNF699 genotype.

Show evidence (2 references)

PMID:39424669 SUPPORT Human Clinical

The proposed diagnostic use.

PMID:42534679 SUPPORT Human Clinical

"the presence of a gene-specific episignature provides an orthogonal and widely accepted line of evidence to support pathogenicity in disorders associated with aberrant DNA methylation"

The episignature used as the deciding evidence for a KRAB-domain missense VUS.

📊

Prevalence

Worldwide

Cases In Literature Ultra Rare

About 30 individuals had been reported by the 2024 Karimi cohort (12 of them new in that paper), with a handful of single-case reports since. The founding cohort came from consanguineous families of Arab descent, and later cases from Poland, China, Italy, Brazil and the Middle East. No population estimate exists.

Show evidence (2 references)

PMID:39424669 SUPPORT Human Clinical

"We collected data on 30 affected individuals (12 new)."

Fixes the size of the published case base at the largest cohort.

PMID:35205213 SUPPORT Human Clinical

"Here, we report a new case (14th up to date) of a patient with ZNF699 gene mutation"

The case count one year after the founding report, for the trajectory.

{ }

Source YAML

click to show

name: DEGCAGS Syndrome
creation_date: "2026-09-22T00:00:00Z"
category: Mendelian
description: >-
  DEGCAGS syndrome (developmental delay with gastrointestinal, cardiovascular,
  genitourinary, and skeletal abnormalities; OMIM 619488) is an autosomal recessive
  multiple-malformation neurodevelopmental disorder caused by biallelic
  loss-of-function variants in ZNF699. ZNF699 encodes a KRAB zinc finger protein of
  unknown function, distantly related to the Drosophila gene hangover, and before
  2021 it was known in human genetics only as a candidate locus for alcohol
  dependence. The syndrome was delineated by Bertoli-Avella and colleagues in 2021
  from 13 children in 12 consanguineous families carrying homozygous frameshift
  variants, and the 2024 Karimi cohort brought the published case base to about 30
  individuals.

  The clinical picture is severe global developmental delay with hypotonia and a
  recognisable coarse facial gestalt (thick eyebrows with synophrys, long eyelashes,
  bulbous nose, smooth philtrum, wide mouth, micrognathia), on which sit discordant
  congenital anomalies: intestinal atresia requiring surgery in the first days of
  life, septal and pulmonary valve defects, renal hypoplasia and genital anomalies,
  and limb anomalies of the preaxial-polydactyly, absent-thumb and syndactyly type.
  Anemia or pancytopenia, premature graying of hair, sensorineural hearing loss,
  airway malacia and recurrent infections recur across the cohort, and infant
  mortality is substantial: one evaluated child in the founding cohort died at nine
  months and eight siblings of the identified children had died in infancy. The
  organ anomalies are discordant even between full siblings homozygous for the
  same variant, and no genotype-phenotype correlation is established.

  Two things distinguish the entry mechanistically. First, there is no experimental
  system for ZNF699 and no functional work has been reported, so the pathograph
  stops at the genetic lesion and a set of organ-system consequences that the
  cohorts document but do not explain. Second, a robust and specific blood DNA
  methylation episignature has been identified and is now used diagnostically to
  classify ZNF699 variants of uncertain significance; whether the methylation
  changes mediate the phenotype, as the 2024 differentially-methylated-region
  analysis tentatively suggests, is an open hypothesis and is recorded as one. A
  2026 report of a young adult with combined immunodeficiency and near-absent B
  cells extends the immune phenotype from recurrent infections to a characterised
  inborn error of immunity.
synonyms:
- Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities
- ZNF699-related neurodevelopmental disorder
parents:
- Neurodevelopmental disorder
- Multiple congenital anomalies syndrome
disease_term:
  preferred_term: DEGCAGS syndrome
  term:
    id: MONDO:0859181
    label: DEGCAGS syndrome
inheritance:
- name: Autosomal recessive
  inheritance_term:
    preferred_term: Autosomal recessive inheritance
    term:
      id: HP:0000007
      label: Autosomal recessive inheritance
  description: >-
    Autosomal recessive. The founding cohort was entirely homozygous, reflecting
    ascertainment in consanguineous families; the first non-consanguineous case
    carried two nonsense variants in trans, one from each parent, which established
    that compound heterozygosity produces the same syndrome. Heterozygous carriers
    are unaffected and, on methylation profiling, cluster separately from both
    patients and controls.
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The DEGCAGS syndrome is inherited in the autosomal recessive mode."
    explanation: States the mode of inheritance directly.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Testing of the parents showed that the variant p.Gln179Ter was inherited from the mother, while p.Arg443Ter was inherited from the father (Figure 2), which is consistent with in trans variants transmission in the autosomal recessive mode of inheritance."
    explanation: >-
      Segregation in the first compound heterozygous family, which is the evidence
      that the recessive mode holds outside consanguineous homozygosity.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "DEGCAGS syndrome is a clinically variable recessive syndrome even among siblings with a distinct methylation episignature which can be used as a screening, diagnostic and classification tool for ZNF699 variants."
    explanation: The largest cohort's summary of the inheritance and its intra-familial variability.
references:
- reference: PMID:33875846
  title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
- reference: PMID:35205213
  title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
- reference: PMID:36607994
  title: "Next generation phenotyping with quantitative narration for DEGCAGS syndrome."
- reference: PMID:38014480
  title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
- reference: PMID:39424669
  title: "Epigenomic and phenotypic characterization of DEGCAGS syndrome."
- reference: PMID:40790844
  title: "Hematologic Findings in DEGCAGS Syndrome: A Diagnostic Consideration in a Patient With Suspected Inherited Bone Marrow Failure."
- reference: PMID:41205195
  title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
- reference: PMID:42534679
  title: "A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion."
- reference: PMID:42569837
  title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
- reference: PMID:36341546
  title: "Structure and functional mapping of the KRAB-KAP1 repressor complex."
- reference: PMID:16940975
  title: "Alcohol dependence is associated with the ZNF699 gene, a human locus related to Drosophila hangover, in the Irish Affected Sib Pair Study of Alcohol Dependence (IASPSAD) sample."
prevalence:
- population: Worldwide
  measure_type: CASES_IN_LITERATURE
  prevalence_class: ULTRA_RARE
  notes: >-
    About 30 individuals had been reported by the 2024 Karimi cohort (12 of them new
    in that paper), with a handful of single-case reports since. The founding cohort
    came from consanguineous families of Arab descent, and later cases from Poland,
    China, Italy, Brazil and the Middle East. No population estimate exists.
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We collected data on 30 affected individuals (12 new)."
    explanation: Fixes the size of the published case base at the largest cohort.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Here, we report a new case (14th up to date) of a patient with ZNF699 gene mutation"
    explanation: The case count one year after the founding report, for the trajectory.
genetic:
- name: ZNF699
  gene_term:
    preferred_term: ZNF699
    term:
      id: hgnc:24750
      label: ZNF699
  relationship_type: CAUSATIVE
  notes: >-
    ZNF699 at 19p13.2 (NM_198535) encodes a 643-residue protein with an N-terminal
    KRAB domain and 16 C2H2 zinc fingers. No ClinGen gene-disease validity assertion
    exists for this pair, so CAUSATIVE rests on the recurrence of biallelic
    loss-of-function variants across more than a dozen unrelated families with a
    consistent syndrome, plus a gene-specific methylation episignature that
    classifies carriers and patients separately. Most reported alleles are frameshift
    or nonsense; the homozygous missense variants in the case literature fall in the
    zinc-finger region (p.Ser460Leu) and, in 2026, in the KRAB domain (p.Asn51Lys).
    The latter remains a variant of uncertain significance by ACMG criteria, with the
    episignature match offered as supporting evidence of pathogenicity because no
    functional assay for ZNF699 exists.
  variants:
  - name: "NM_198535.2:c.436_439del p.(Asp146Ilefs*10)"
    description: >-
      The recurrent allele of the founding cohort, homozygous in eight of the thirteen
      patients across several families.
  - name: "NM_198535.2:c.1623_1626delTTAT p.(Tyr542fs)"
    description: Homozygous frameshift in two siblings of the founding cohort.
  - name: "NM_198535.3:c.535C>T p.(Gln179Ter) / c.1327C>T p.(Arg443Ter)"
    description: >-
      Compound heterozygous nonsense variants in the first non-consanguineous patient,
      one inherited from each parent.
  - name: "c.1379C>T p.(Ser460Leu)"
    description: Homozygous missense variant in the first patient with detailed ophthalmological documentation.
  - name: "c.153C>A p.(Asn51Lys)"
    description: >-
      Homozygous missense variant within the KRAB domain, the first reported there,
      in a young adult with combined immunodeficiency; classified as a VUS by ACMG
      criteria and supported by a high-confidence episignature match.
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Thirteen patients from 12 families were identified with homozygous loss-of-function (LoF) variants in this gene (Fig. 3)."
    explanation: The founding gene-disease association.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 26 | ZNF699 | NM_198535.2 : c.436_439del | p.Asp146Ilefs*10 | Hom |"
    explanation: Table 1 row for the recurrent founding allele.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "two nonsense variants in compound heterozygote state in ZNF699 gene (NM_198535.3) were prioritized for further investigation: (hg 38, chr19:g.009296869-G>A; c.535C>T/p.Gln179Ter) and (hg38, chr19:g.009296077-G>A; c.1327C>T/p.Arg443Ter)."
    explanation: The compound heterozygous nonsense genotype.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "sequencing performed after 2 weeks of life revealed homozygous variants c.1379C>T(p.S460L) in the ZNF699 gene on chromosome 19p13.2"
    explanation: The first homozygous missense allele.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Sanger sequencing identified a homozygous missense variant (c.153C>A; p. Asn51Lys) in the ZNF699 gene with parents carrying the same variant in heterozygous state"
    explanation: The KRAB-domain missense allele and its segregation.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    quote_role: BACKGROUND
    evidence_source: OTHER
    snippet: "The variant falls within the Krüppel-Associated Box (KRAB) domain, which plays a critical role in transcriptional repression"
    explanation: >-
      Domain placement of the missense allele. The statement about KRAB function is
      textbook background restated by the authors, not a result of the paper, hence
      BACKGROUND and OTHER; it is the only statement in the cached corpus that ties
      ZNF699 to a molecular function.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: COMPUTATIONAL
    snippet: "This change disrupts the interaction between asparagine and valine, which is facilitated by a hydrogen bond in the wild-type structure"
    explanation: The AlphaFold2-based structural modelling of the KRAB-domain missense variant, which is the paper's own in-silico result.
pathophysiology:
- name: Biallelic ZNF699 Loss of Function
  description: >-
    Homozygous or compound heterozygous frameshift, nonsense and rare missense
    variants abolish or disable the ZNF699 KRAB zinc finger protein. Nothing is known
    of the protein's targets: the KRAB domain implies transcriptional repression and
    the sixteen C2H2 zinc fingers imply sequence-specific DNA binding, and that is the
    extent of the mechanistic knowledge. The modifier on the bound process is
    therefore an inference from domain architecture, not a measurement, and no
    experimental system for ZNF699 exists.
  biological_scale: MOLECULAR
  genetic_context:
    gene:
      preferred_term: ZNF699
      term:
        id: hgnc:24750
        label: ZNF699
    functional_impact_category: LOSS_OF_FUNCTION
  genes:
  - preferred_term: ZNF699
    term:
      id: hgnc:24750
      label: ZNF699
  biological_processes:
  - preferred_term: KRAB-mediated transcriptional repression
    description: >-
      Inferred from domain architecture, not measured: no ZNF699 target or repression
      assay has been reported.
    term:
      id: GO:0045892
      label: negative regulation of DNA-templated transcription
    modifier: DECREASED
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "is caused by biallelic, loss-of-function (LoF) ZNF699 variants, and is characterized by variable neurodevelopmental disability, discordant organ anomalies among full siblings and infant mortality."
    explanation: The mechanism as stated by the largest cohort.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "ZNF699 encodes a KRAB zinc finger protein of unknown function."
    explanation: The honest state of knowledge about the protein.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The gene encodes a large nuclear zinc-finger protein, suggesting a molecular role in nucleic acid binding."
    explanation: The founding report's only functional statement, itself an inference from the protein family.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "no validated experimental system is currently available to functionally assess ZNF699"
    explanation: Why the node carries no measured molecular consequence.
  - reference: PMID:16940975
    reference_title: "Alcohol dependence is associated with the ZNF699 gene, a human locus related to Drosophila hangover, in the Irish Affected Sib Pair Study of Alcohol Dependence (IASPSAD) sample."
    supports: SUPPORT
    evidence_source: COMPUTATIONAL
    snippet: "The orthology of hang in mammals is complex, but a number of human gene products (including ZNF699) with similar levels of amino-acid identity (18-26%) and similarity (30-41%), are consistently identified as the best matches with the translated hang sequence."
    explanation: >-
      The sequence-similarity basis of the hangover relationship, which is weak and
      shared with several human genes; the entry therefore does not call ZNF699 the
      ortholog, and no Drosophila phenotype is used as a model of the disease.
  downstream:
  - target: Aberrant Genome-wide DNA Methylation
    causal_link_type: DIRECT
    description: >-
      Biallelic loss of a KRAB zinc finger protein produces a reproducible blood DNA
      methylation episignature. The link is genotype-specific: heterozygous carriers
      cluster apart from both patients and controls.
    evidence:
    - reference: PMID:39424669
      reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "We also identified a robust episignature for DEGCAGS syndrome."
      explanation: The methylation consequence of the genotype, in nine profiled patients.
    - reference: PMID:42534679
      reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "As expected from their genotype, the parents' episignature is classified within the heterozygous carrier cluster"
      explanation: Dosage-dependence of the methylation change, which ties it to the genotype rather than to the clinical state.
  - target: Disrupted Embryonic Organ Morphogenesis
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    description: >-
      The multi-organ malformations are the defining consequence of the genotype, but
      no intermediate step between the missing protein and the malformed organ has
      been identified.
    evidence:
    - reference: PMID:33875846
      reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "These patients presented with a clear malformation syndrome with coarse facial features and abnormalities of the cardiovascular, gastrointestinal (gastroesophageal reflux, intestinal atresia), genitourinary (renal dysplasia/hypoplasia, ambiguous genitalia), and skeletal system (syndactyly, preaxial polydactyly, absent thumbs)."
      explanation: The malformation syndrome in the thirteen homozygous LoF patients.
  - target: Impaired Neurodevelopment
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:33875846
      reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "All patients presented severe NDD."
      explanation: Neurodevelopmental delay was universal in the homozygous LoF cohort.
  - target: Impaired Hematopoiesis and Lymphocyte Development
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:42534679
      reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "biallelic ZNF699 loss-of-function variants can cause syndromic combined immunodeficiency"
      explanation: The genotype to immune-compartment claim, from the first immunologically characterised patient.
    - reference: PMID:33875846
      reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."
      explanation: Cytopenias were a recurrent feature of the founding cohort.
- name: Aberrant Genome-wide DNA Methylation
  description: >-
    Peripheral-blood DNA from patients carries a robust, specific methylation
    episignature that separates DEGCAGS from controls, from heterozygous carriers and
    from other episignature-bearing neurodevelopmental disorders. The signature is
    established as a diagnostic biomarker. Whether it also mediates the phenotype is
    not: the 2024 differentially-methylated-region analysis suggested effects on
    genes that could be relevant to pathogenesis, and that is where the evidence
    stops. The downstream edges from this node are therefore tagged with the
    epigenetic-mediation hypothesis rather than asserted.
  biological_scale: MOLECULAR
  cell_types:
  - preferred_term: peripheral blood leukocyte
    term:
      id: CL:0000738
      label: leukocyte
  biological_processes:
  - preferred_term: genome-wide DNA methylation pattern
    description: >-
      GO has retired its DNA methylation process terms, so the episignature is bound
      to the epigenetic-regulation parent whose definition names cytosine methylation.
    term:
      id: GO:0040029
      label: epigenetic regulation of gene expression
    modifier: ABNORMAL
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In nine individuals, methylation profiling of blood-DNA was performed, and a classification model was constructed to differentiate DEGCAGS from controls."
    explanation: The profiling that defined the signature.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Analysis of differentially methylated regions suggested an effect on genes potentially implicated in the syndrome's pathogenesis."
    explanation: The only statement connecting the methylation change to mechanism, phrased as a suggestion.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "a high confidence match with an methylation variant pathogenicity (MVP) of 0.891 was found for the episignature associated with DEGCAGS"
    explanation: Independent replication of the signature in a patient carrying a variant class (KRAB-domain missense) absent from the training set.
  downstream:
  - target: Disrupted Embryonic Organ Morphogenesis
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    hypothesis_groups:
    - epigenetic_mediation
    description: Hypothesised, not established; see the mechanistic hypothesis.
  - target: Impaired Neurodevelopment
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    hypothesis_groups:
    - epigenetic_mediation
    description: Hypothesised, not established; see the mechanistic hypothesis.
  - target: Impaired Hematopoiesis and Lymphocyte Development
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    hypothesis_groups:
    - epigenetic_mediation
    description: >-
      Hypothesised. The authors of the immunodeficiency report note that many
      episignature-bearing disorders also show immunodeficiency and raise an
      epigenetic contribution to inborn errors of immunity as a possibility.
    evidence:
    - reference: PMID:42534679
      reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
      supports: SUPPORT
      directness: INDIRECT
      evidence_source: OTHER
      snippet: "Interestingly, many conditions for which a specific episignature has been identified also show signs of immunodeficiency supporting the hypothesis of a potential contribution of epigenetics in the pathophysiology of certain inborn errors of immunity"
      explanation: >-
        The authors' own framing of the hypothesis. INDIRECT because it is an
        argument from co-occurrence across disorders, not a result in this one.
- name: Disrupted Embryonic Organ Morphogenesis
  description: >-
    Congenital anomalies of gut (jejunal and other intestinal atresia, pyloric
    stenosis), heart (septal defects, pulmonary valve stenosis or dysplasia, patent
    ductus), kidney and genitalia (renal hypoplasia or dysplasia, cryptorchidism,
    hypospadias, chordee, ambiguous genitalia), limbs (preaxial polydactyly, absent
    thumbs, syndactyly, talipes) and craniofacial skeleton, discordant in which organs
    are affected even between siblings sharing a genotype. The node is a
    tissue-level summary of a developmental failure whose molecular basis is unknown;
    each bound process is an organ system in which the cohorts document a
    malformation, with ABNORMAL rather than a direction because the anomalies span
    both hypoplasia and duplication.
  biological_scale: TISSUE
  biological_processes:
  - preferred_term: embryonic organ development
    term:
      id: GO:0048568
      label: embryonic organ development
    modifier: ABNORMAL
  - preferred_term: heart development
    term:
      id: GO:0007507
      label: heart development
    modifier: ABNORMAL
  - preferred_term: kidney development
    term:
      id: GO:0001822
      label: kidney development
    modifier: ABNORMAL
  - preferred_term: skeletal system development
    term:
      id: GO:0001501
      label: skeletal system development
    modifier: ABNORMAL
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patients presented with a severe phenotype that included congenital heart defects, gastrointestinal (intestinal atresia, pyloric stenosis, GER, hepatosplenomegaly), genitourinary (renal hypoplasia, cryptorchidism, chordee, hypospadias, ambiguous genitalia), and skeletal abnormalities (preaxial polydactyly, absent thumbs, syndactyly)."
    explanation: The organ-system inventory of the founding cohort.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "discordant organ anomalies among full siblings"
    explanation: The intra-familial discordance that makes this a variable developmental failure rather than a fixed malformation pattern.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Dysmorphic features (coarse facial, thick eyebrows, nose abnormalities, syndactyly), intestinal atresia that requires operation in the first days of life, and congenital heart defects (in general) seem to be the specific major symptoms that could be helpful to suspect the DEGCAGS syndrome in the early period of life."
    explanation: The fourteen-patient synthesis of which malformations are most characteristic.
  downstream:
  - target: Intestinal atresia
  - target: Pyloric stenosis
  - target: Atrial septal defect
  - target: Pulmonic stenosis
  - target: Patent ductus arteriosus
  - target: Renal hypoplasia
  - target: Cryptorchidism
  - target: Hypospadias
  - target: Ambiguous genitalia
  - target: Preaxial polydactyly
  - target: Absent thumb
  - target: Syndactyly
  - target: Talipes equinovarus
  - target: Coarse facial features
  - target: Thick eyebrow
  - target: Synophrys
  - target: Long eyelashes
  - target: Smooth philtrum
  - target: Micrognathia
  - target: Thin upper lip vermilion
  - target: Craniosynostosis
  - target: Laryngomalacia
  - target: Tracheomalacia
  - target: Hamartoma
  - target: Taurodontia
- name: Impaired Neurodevelopment
  description: >-
    Severe global developmental delay with intellectual disability and central
    hypotonia in every reported patient, microcephaly in about half, sensorineural
    hearing loss in a minority, and non-specific white matter change on imaging
    (punctate non-hemorrhagic white matter lesions, periventricular echogenicity,
    ventricular enlargement, in one case agenesis of the corpus callosum). The
    2024 cohort describes the presentation as age-related, and the one adult
    reported had a borderline IQ, so the severity range is wider than the infant
    cohorts suggested.
  biological_scale: TISSUE
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: nervous system development
    term:
      id: GO:0007399
      label: nervous system development
    modifier: ABNORMAL
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "All patients presented severe NDD."
    explanation: Universality of the neurodevelopmental phenotype in the founding cohort.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "show that biallelic, LoF, ZNF699 variants cause unique clinical findings with age-related presentation and a similar facial gestalt"
    explanation: The age-dependence of the presentation in the 30-patient cohort.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "MRI scan showed non-hemorrhagic punctate white matter densities without anatomic brain abnormalities"
    explanation: The imaging correlate in a profoundly hypotonic neonate; notable for how little structural change accompanied the clinical severity.
  downstream:
  - target: Global developmental delay
  - target: Intellectual disability
  - target: Generalized hypotonia
  - target: Microcephaly
  - target: Sensorineural hearing impairment
  - target: Abnormal cerebral white matter morphology
  - target: Agenesis of corpus callosum
  - target: Ventriculomegaly
  - target: Strabismus
- name: Impaired Hematopoiesis and Lymphocyte Development
  description: >-
    Anemia or pancytopenia in over half of the founding cohort, leukopenia in later
    cases, and one patient investigated for suspected inherited bone marrow failure.
    The immune arm was first characterised in 2026 in a 20-year-old with recurrent
    severe lower respiratory infection and bronchiectasis: near-absent circulating B
    cells, reduced naive CD4 and CD8 T cells, impaired mitogen response and reduced
    kappa-deleting recombination excision circles, with normal immunoglobulins and
    vaccine responses, meeting ESID criteria for combined immunodeficiency.
    Immunodeficiency or recurrent infection is reported in about two fifths of
    patients. Whether the defect is one of hematopoietic stem cell output or of
    lineage-specific lymphocyte development is not known; the 2025 bone marrow
    failure report is said to have raised an RNA polymerase II and ribosome
    biogenesis analogy, but its abstract is not in the cache and that proposal is
    not curated here.
  biological_scale: CELLULAR
  cell_types:
  - preferred_term: hematopoietic stem cell
    term:
      id: CL:0000037
      label: hematopoietic stem cell
  - preferred_term: B cell
    term:
      id: CL:0000236
      label: B cell
  - preferred_term: naive T cell
    term:
      id: CL:0000898
      label: naive T cell
  biological_processes:
  - preferred_term: hemopoiesis
    term:
      id: GO:0030097
      label: hemopoiesis
    modifier: DECREASED
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"
    explanation: The measured lymphocyte compartments in the first immunologically characterised patient.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    quote_role: BACKGROUND
    evidence_source: HUMAN_CLINICAL
    snippet: "Immunodeficiency and/or recurrent infections are reported in 42.3% of patients"
    explanation: The cohort frequency of the immune phenotype, as the immunology report summarises the 2024 cohort.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In the laboratory findings, the most frequently reported deviation was in the complete blood count (8/14), two patients had pancytopenia, and six patients had anemia."
    explanation: Frequency of cytopenias across the first fourteen patients.
  downstream:
  - target: Anemia
  - target: Pancytopenia
  - target: Decreased total B cell count
  - target: Decreased naive CD4+ T cell proportion
  - target: Decreased naive CD8+ T cell proportion
  - target: Immunodeficiency
  - target: Combined immunodeficiency
  - target: Recurrent infections
mechanistic_hypotheses:
- hypothesis_group_id: epigenetic_mediation
  hypothesis_label: >-
    Loss of ZNF699-directed methylation at target loci mediates the malformation,
    neurodevelopmental and hematopoietic phenotypes
  status: EMERGING
  description: >-
    KRAB zinc finger proteins recruit the co-repressor KAP1 (TRIM28) through their
    KRAB domain, and KAP1 in turn deposits H3K9me3 and DNA methylation at the bound
    loci; DEGCAGS patients carry a robust blood methylation episignature. The
    hypothesis is that the episignature is the visible trace of a genome-wide loss
    of ZNF699-directed repression, and that derepression of specific target genes
    during development produces the phenotype. The 2024 cohort's
    differentially-methylated-region analysis pointed at genes plausibly involved in
    pathogenesis but did not test any. Against the hypothesis: the episignature is
    measured in blood leukocytes, not in the developing organs; the KRAB-KAP1 axis
    has been validated structurally and functionally for other KRAB zinc finger
    proteins (ZNF93) but never for ZNF699; and no ZNF699 target has been identified.
    The hypothesis predicts that ZNF699-null cells would show derepression and
    hypomethylation at a definable set of loci and that those loci would be enriched
    for developmental regulators of the affected organs.
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    directness: INDIRECT
    evidence_source: HUMAN_CLINICAL
    snippet: "Analysis of differentially methylated regions suggested an effect on genes potentially implicated in the syndrome's pathogenesis."
    explanation: >-
      The observation that motivates the hypothesis. INDIRECT because it is an
      enrichment in blood-derived DNA, not a demonstration of a target gene's role.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    directness: INDIRECT
    quote_role: BACKGROUND
    evidence_source: OTHER
    snippet: "The variant falls within the Krüppel-Associated Box (KRAB) domain, which plays a critical role in transcriptional repression"
    explanation: The domain-level basis for expecting ZNF699 to act as a transcriptional repressor; restated background rather than a measurement.
  - reference: PMID:36341546
    reference_title: Structure and functional mapping of the KRAB-KAP1 repressor complex.
    supports: SUPPORT
    directness: INDIRECT
    quote_role: BACKGROUND
    evidence_source: IN_VITRO
    snippet: "KRAB domain-containing zinc finger proteins (KRAB-ZFPs) recruit the co-repressor KRAB-associated protein 1 (KAP1/TRIM28) to regulate many transposable elements, but how KRAB-ZFPs and KAP1 interact remains unclear."
    explanation: >-
      The general KRAB-ZFP mechanism the hypothesis extrapolates from. INDIRECT
      because the study concerns ZNF93 and the KRAB family, not ZNF699.
  - reference: PMID:36341546
    reference_title: Structure and functional mapping of the KRAB-KAP1 repressor complex.
    supports: SUPPORT
    directness: INDIRECT
    evidence_source: IN_VITRO
    snippet: "Deposition of H3K9me3 over thousands of loci is lost genome-wide in cells expressing a KAP1 variant with mutations that abolish KRAB binding."
    explanation: >-
      Shows that breaking the KRAB-KAP1 interface removes repressive chromatin
      genome-wide, which is the shape of consequence the hypothesis predicts for a
      KRAB-domain missense such as p.Asn51Lys; again in a different KRAB-ZFP.
phenotypes:
- category: Neurologic
  name: Global developmental delay
  description: >-
    Severe global developmental delay in every reported patient, the constant
    feature of the syndrome. Motor delay is compounded by central hypotonia and, in
    the sickest infants, by prolonged intensive care.
  frequency: OBLIGATE
  phenotype_term:
    preferred_term: Global developmental delay
    term:
      id: HP:0001263
      label: Global developmental delay
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "All patients presented severe NDD."
    explanation: Universal in the founding cohort.
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    quote_role: BACKGROUND
    evidence_source: HUMAN_CLINICAL
    snippet: "All individuals presented severe global developmental delay with significant intellectual impairment and hypotonia"
    explanation: A later report's summary of the founding cohort's neurodevelopmental phenotype.
- category: Neurologic
  name: Intellectual disability
  description: >-
    Intellectual disability accompanies the developmental delay in those old enough
    to assess. The one adult reported, at 20 years, had a borderline IQ of 77, so the
    range extends to mild.
  frequency: VERY_FREQUENT
  phenotype_term:
    preferred_term: Intellectual disability
    term:
      id: HP:0001249
      label: Intellectual disability
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 27 | ZNF699 | NM_198535.2 : c.1623_1626delTTAT | p.Tyr542fs | Hom | Yes, no | Wide mouth, microcephaly, abnormality of the face, smooth philtrum, micrognathia, abnormal electroretinogram, long eyelashes, nystagmus, syndactyly, intellectual disability"
    explanation: Table 1 row listing intellectual disability among the HPO terms of patient 27; the same term appears on patients 28, 29, 33 and 37.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He also had a history of cryptorchidism, feeding difficulties, hypotonia, developmental delay and borderline IQ score (IQ 77)"
    explanation: The mildest cognitive outcome reported, in the only adult.
- category: Neurologic
  name: Generalized hypotonia
  description: >-
    Central hypotonia with preserved deep tendon reflexes, present from birth and in
    the most severe cases profound enough to leave a neonate almost immobile apart
    from eye movement. Present in half of the first fourteen patients by Biela's
    count, and listed by the founding report as a recurrent feature.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Generalized hypotonia
    term:
      id: HP:0001290
      label: Generalized hypotonia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Muscular hypotonia was present in seven patients."
    explanation: Seven of fourteen, the basis for FREQUENT.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Other recurrent features were generalized hypotonia, sensorineural hearing impairment, and premature hair graying."
    explanation: Listed as a recurrent feature of the founding cohort.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The child had striking diffuse hypotonia at birth with very little movement of any part of his body except his eyes and with no evidence of spasticity or hyperreflexia."
    explanation: The severe end of the hypotonia spectrum, and its central, non-spastic character.
- category: Neurologic
  name: Microcephaly
  description: Microcephaly in six of the first fourteen patients, usually with the coarse facial gestalt.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Microcephaly
    term:
      id: HP:0000252
      label: Microcephaly
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "All patients had dysmorphic features, which included: An abnormal facial shape (9/14), microcephaly (6/14), long eyelashes (4/14), abnormal eyebrows (thick or unibrow, 4/14), nose abnormalities (prominent nasal bridge, upturned nose, short nose, 5/14)"
    explanation: Six of fourteen.
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Clinical evaluation revealed microcephaly, coarse facial features, oropharyngeal masses, and developmental delay."
    explanation: A later case with the same combination.
- category: Neurologic
  name: Sensorineural hearing impairment
  description: Sensorineural hearing loss in four of the first fourteen patients; one further patient had unilateral conductive loss with atresia of the external auditory canal.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Sensorineural hearing impairment
    term:
      id: HP:0000407
      label: Sensorineural hearing impairment
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Sensorineural hearing impairment was observed in four patients."
    explanation: Four of fourteen.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."
    explanation: Listed among the common features of the founding cohort.
- category: Neurologic
  name: Abnormal cerebral white matter morphology
  description: >-
    Non-specific white matter change: punctate non-hemorrhagic deep white matter
    lesions on neonatal MRI in one patient, periventricular hyperechogenicity with
    ventricular widening on ultrasound in another, and abnormal myelination or
    agenesis of the corpus callosum in single patients of the founding cohort.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Abnormal cerebral white matter morphology
    term:
      id: HP:0002500
      label: Abnormal cerebral white matter morphology
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "MRI scan showed non-hemorrhagic punctate white matter densities without anatomic brain abnormalities"
    explanation: The MRI finding at 8 days of life.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In the ultrasonography of the brain, higher echogenicity of periventricular white matter was found."
    explanation: The ultrasound correlate in the Polish patient.
- category: Neurologic
  name: Agenesis of corpus callosum
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Agenesis of corpus callosum
    term:
      id: HP:0001274
      label: Agenesis of corpus callosum
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "single umbilical artery, global developmental delay, agenesis of corpus callosum, cholestasis, vocal cord paralysis"
    explanation: Agenesis of the corpus callosum among patient 26's HPO terms; a single patient.
- category: Neurologic
  name: Ventriculomegaly
  description: Ventriculomegaly in one founding-cohort patient and ventricular widening with enlarged extracerebral fluid spaces, read as atrophy, on CT in the Polish patient.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Ventriculomegaly
    term:
      id: HP:0002119
      label: Ventriculomegaly
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "sacral dimple, short nose, small for gestational age, thick vermilion border, ventriculomegaly, wide intermammary distance"
    explanation: Ventriculomegaly among patient 35's HPO terms.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Computer tomography of the brain showed widening of the ventricular system and enlarged post-cerebral fluid space as in atrophy."
    explanation: The CT finding in the Polish patient.
- category: Craniofacial
  name: Coarse facial features
  description: >-
    The facial gestalt is the most consistent external sign: coarse face with low
    anterior hairline and thick scalp hair, thick eyebrows with synophrys, long
    eyelashes and long palpebral fissures, proptosis, bulbous nose with a low-hanging
    columella, smooth philtrum, wide mouth with thin upper vermilion, micrognathia and
    short neck. GestaltMatcher analysis of the 2024 cohort found the gestalt similar
    across patients. The frequency band comes from Biela's count of an abnormal facial
    shape in nine of fourteen patients, a broader concept than coarse features, which
    the founding report's Table 1 names explicitly in only two rows; the 100 percent
    facial dysmorphism figure in the 2024 cohort is in its full text, which is not
    cached, so it is not used to set the band.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Coarse facial features
    term:
      id: HP:0000280
      label: Coarse facial features
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patient 27, male index has low anterior hairline, thick scalp hair, thick eyebrows, synophrys, long eyelashes, long palpebral fissures, proptosis, strabismus, bulbous nose, low hanging columella, smooth philtrum, wide mouth, micrognathia, short neck, brachydactyly, right preaxial polydactyly, and bilateral syndactyly of the second and third toes."
    explanation: The full facial description of an index patient.
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    quote_role: BACKGROUND
    evidence_source: HUMAN_CLINICAL
    snippet: "In this cohort, patients exhibited coarse facial features, often accompanied by microcephaly, as well as prematurely graying hair"
    explanation: A later report summarising the founding cohort's facial phenotype.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "GestaltMatcher analyzed fifty-three facial photographs from five individuals."
    explanation: The computational facial analysis behind the claim of a shared gestalt; it supports consistency of the gestalt, not its frequency.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "All patients had dysmorphic features, which included: An abnormal facial shape (9/14), microcephaly (6/14), long eyelashes (4/14), abnormal eyebrows (thick or unibrow, 4/14), nose abnormalities (prominent nasal bridge, upturned nose, short nose, 5/14)"
    explanation: Nine of fourteen with an abnormal facial shape, the count that sets the FREQUENT band.
- category: Craniofacial
  name: Thick eyebrow
  description: Thick eyebrows, counted together with synophrys as abnormal eyebrows in four of the first fourteen patients.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Thick eyebrow
    term:
      id: HP:0000574
      label: Thick eyebrow
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "abnormal eyebrows (thick or unibrow, 4/14)"
    explanation: Four of fourteen, thick eyebrows and synophrys counted together.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patient 27, male index has low anterior hairline, thick scalp hair, thick eyebrows, synophrys, long eyelashes"
    explanation: Thick eyebrows in an index patient of the founding cohort.
- category: Craniofacial
  name: Synophrys
  description: Fused eyebrows in two founding-cohort patients and in the 10-year-old Brazilian patient; Biela's count folds it into abnormal eyebrows.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Synophrys
    term:
      id: HP:0000664
      label: Synophrys
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patient 27, male index has low anterior hairline, thick scalp hair, thick eyebrows, synophrys, long eyelashes"
    explanation: Synophrys in patient 27; it is also listed among patient 31's HPO terms in Table 1.
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Clinical examination revealed hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip, increased overjet, and deep bite."
    explanation: Synophrys in the 10-year-old Brazilian patient.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "abnormal eyebrows (thick or unibrow, 4/14)"
    explanation: The combined count that sets the OCCASIONAL band.
- category: Craniofacial
  name: Long eyelashes
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Long eyelashes
    term:
      id: HP:0000527
      label: Long eyelashes
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "microcephaly (6/14), long eyelashes (4/14), abnormal eyebrows (thick or unibrow, 4/14)"
    explanation: Four of fourteen.
- category: Craniofacial
  name: Smooth philtrum
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Smooth philtrum
    term:
      id: HP:0000319
      label: Smooth philtrum
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 26 | ZNF699 | NM_198535.2 : c.436_439del | p.Asp146Ilefs*10 | Hom | Yes, yes | High palate, coarse facial features, smooth philtrum"
    explanation: Table 1 row for patient 26; also listed for patient 27 and in the 2026 dental report.
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Clinical examination revealed hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip, increased overjet, and deep bite."
    explanation: Smooth philtrum with thin upper lip in the 10-year-old.
- category: Craniofacial
  name: Micrognathia
  description: Micrognathia or retrognathia, in several patients severe enough to be noted at birth.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Micrognathia
    term:
      id: HP:0000347
      label: Micrognathia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The infant was noticed to have dysmorphic features such as: a Saddle nose, low-set ears, retrognathia with micrognathia, suspicion of bilateral atresia of the external auditory canals, doubling of the right thumb"
    explanation: Neonatal dysmorphology of the Polish patient.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 36 | ZNF699 | NM_198535.2 : c.51_54delCTCA | p.Asp17fs | Hom | Yes, yes | Cryptorchidism, chordee, ambiguous genitalia, abnormality of the face, micrognathia, low-set ears, syndactyly, craniosynostosis"
    explanation: Table 1 row for patient 36.
- category: Craniofacial
  name: Thin upper lip vermilion
  description: Thin upper lip in an index patient of the founding cohort and in the 10-year-old Brazilian patient.
  frequency: OCCASIONAL
  notes: >-
    PMID:33875846 contradicts itself on patient 35: Table 1 lists "thick vermilion border"
    as an HPO term, while Figure 3 legend describes a photograph and states "thin vermilion
    of the upper lip". This entry follows the figure legend, which describes a photographic
    record, over the Table 1 categorization. The phenotype claim does not depend on patient 35;
    the second citation (PMID:42569837) is an independent patient in a different paper.
  phenotype_term:
    preferred_term: Thin upper lip vermilion
    term:
      id: HP:0000219
      label: Thin upper lip vermilion
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patient 35, male index with coarse face, broad eyebrows, long palpebral fissures, wide mouth, thin vermilion of the upper lip, and bilateral absent thumbs."
    explanation: >-
      Figure 3 legend describes thin upper vermilion in patient 35 (from photographic record).
      Note: the same paper lists patient 35 with "thick vermilion border" in Table 1 HPO terms;
      this entry follows the figure legend description.
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Clinical examination revealed hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip, increased overjet, and deep bite."
    explanation: Thin upper lip in the 10-year-old.
- category: Craniofacial
  name: Dolichocephaly
  description: >-
    Anteroposterior head elongation in the 10-year-old Brazilian patient, who was
    born preterm and nursed in intensive care. The authors themselves raise a
    positional etiology, so the finding is left unconnected in the pathograph.
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Dolichocephaly
    term:
      id: HP:0000268
      label: Dolichocephaly
  evidence:
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "These included hair thinning, dolichocephaly, mandibular retrognathism associated with micrognathia, and increased overjet."
    explanation: The extraoral examination.
- category: Craniofacial
  name: Craniosynostosis
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Craniosynostosis
    term:
      id: HP:0001363
      label: Craniosynostosis
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "micrognathia, low-set ears, syndactyly, craniosynostosis, patent foramen ovale"
    explanation: Craniosynostosis among patient 36's HPO terms; a single patient.
- category: Craniofacial
  name: Premature graying of hair
  description: >-
    Premature graying or hypopigmentation of hair, unusual in an infant-onset
    malformation syndrome and listed as a common feature in the founding cohort; the
    20-year-old had premature hair graying and the 10-year-old hair thinning.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Premature graying of hair
    term:
      id: HP:0002216
      label: Premature graying of hair
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."
    explanation: Listed as a common feature.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Clinical examination revealed premature hair graying, sunken and hypermetropic eyes, hypotelorism, small dysmorphic ears, beak-shaped nose, nail dystrophy, hyperpigmentation of the neck and periumbilical and axillary regions, obesity, stature at the lowest limit of the midparental height, hypovirilization and gynecomastia, joint hypermobility, brachydactyly of the fifth digit, second and third toe syndactyly, and splenomegaly."
    explanation: Premature graying persisting into the adult phenotype.
- category: Gastrointestinal
  name: Intestinal atresia
  description: >-
    Jejunal or multilevel intestinal atresia in nine of the first fourteen patients,
    presenting as fetal ileus or neonatal obstruction and requiring laparotomy in the
    first days of life, in some cases with massive short-bowel resection and repeat
    operations for adhesions and anastomotic stricture. It is the single most
    characteristic non-neurological feature and the usual reason the diagnosis is
    first suspected.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Intestinal atresia
    term:
      id: HP:0011100
      label: Intestinal atresia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Intestinal atresia was observed in nine patients and was a reason for multiply operations."
    explanation: Nine of fourteen, and the surgical burden.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The patient had a laparotomy with a massive short bowel resection (due to a multi-level obstruction of the jejunum-intestinal atresia) with one anastomosis on day 5 of life."
    explanation: The presentation and surgery in the Polish patient.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 30 | ZNF699 | NM_198535.2 : c.349dupA | p.Ile117fs | Hom | Yes, yes | Syndactyly, muscular hypotonia, intrauterine growth retardation, premature birth, abnormal facial shape, congenital onset, intestinal atresia |"
    explanation: Table 1 row for patient 30; jejunal or intestinal atresia is listed on patients 26, 29, 31, 32, 35, 36 and 38 as well.
  sequelae:
  - target: Feeding difficulties
    description: Post-surgical short bowel and feeding intolerance leave patients dependent on parenteral or tube feeding.
    evidence:
    - reference: PMID:35205213
      reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Due to feeding intolerance, total parental nutrition was required all the time, the patient received trophic nutrition through a naso-intestinal tube."
      explanation: Feeding intolerance following the short bowel resection.
- category: Gastrointestinal
  name: Pyloric stenosis
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Pyloric stenosis
    term:
      id: HP:0002021
      label: Pyloric stenosis
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patients presented with a severe phenotype that included congenital heart defects, gastrointestinal (intestinal atresia, pyloric stenosis, GER, hepatosplenomegaly), genitourinary (renal hypoplasia, cryptorchidism, chordee, hypospadias, ambiguous genitalia), and skeletal abnormalities (preaxial polydactyly, absent thumbs, syndactyly)."
    explanation: Pyloric stenosis among the gastrointestinal anomalies of the founding cohort.
- category: Gastrointestinal
  name: Feeding difficulties
  description: >-
    Feeding difficulty from poor suck, dysphagia, gastroesophageal reflux and
    post-surgical intolerance, with nasogastric, naso-intestinal or gastrostomy
    feeding in several patients.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Feeding difficulties
    term:
      id: HP:0011968
      label: Feeding difficulties
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "There were also feeding difficulties (4/14), and patients required nasogastric tube feeding."
    explanation: Four of fourteen.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "at the age of 75 days, he received a tracheostomy and gastrostomy tube with fundoplication"
    explanation: Gastrostomy with fundoplication for aspiration and reflux.
  sequelae:
  - target: Failure to thrive
    description: Failure to thrive, which the fourteen-patient synthesis attributes to primary or gastrointestinal and cardiac secondary causes.
    evidence:
    - reference: PMID:35205213
      reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Eight patients had a failure to thrive, which may be primary or secondary to symptoms from the gastrointestinal or cardiovascular systems."
      explanation: The authors' own attribution of failure to thrive.
- category: Gastrointestinal
  name: Hepatosplenomegaly
  description: Hepatosplenomegaly in one founding-cohort patient and hepatomegaly in another, listed by the founding report among the gastrointestinal features; the adult patient had splenomegaly. Left unconnected because no source says whether it is congestive, infiltrative or infective.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Hepatosplenomegaly
    term:
      id: HP:0001433
      label: Hepatosplenomegaly
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "nystagmus, syndactyly, intellectual disability, hepatosplenomegaly, failure to thrive"
    explanation: Hepatosplenomegaly among patient 27's HPO terms; patient 26 carries hepatomegaly.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patients presented with a severe phenotype that included congenital heart defects, gastrointestinal (intestinal atresia, pyloric stenosis, GER, hepatosplenomegaly), genitourinary (renal hypoplasia, cryptorchidism, chordee, hypospadias, ambiguous genitalia), and skeletal abnormalities (preaxial polydactyly, absent thumbs, syndactyly)."
    explanation: Listed among the gastrointestinal features of the founding cohort.
- category: Growth
  name: Failure to thrive
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Failure to thrive
    term:
      id: HP:0001508
      label: Failure to thrive
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Eight patients had a failure to thrive, which may be primary or secondary to symptoms from the gastrointestinal or cardiovascular systems."
    explanation: Eight of fourteen.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He presented generalized hypotonia and was severely emaciated. The patient deceased at 9 months old."
    explanation: The most severe growth outcome in the founding cohort.
- category: Growth
  name: Intrauterine growth retardation
  description: Prenatal growth restriction in five of the first fourteen pregnancies, often with polyhydramnios, single umbilical artery or fetal ileus, and premature delivery.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Intrauterine growth retardation
    term:
      id: HP:0001511
      label: Intrauterine growth retardation
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Less than half of the pregnancies (6/14) were complicated by at least one of the following: Intrauterine growth retardation (5/14), polyhydramnios (5/14), single umbilical artery (2/14), and premature birth (5/14)."
    explanation: Five of fourteen, with the co-occurring prenatal complications.
- category: Clinical
  name: Polyhydramnios
  description: Polyhydramnios in five of the first fourteen pregnancies, in at least one case with prenatally diagnosed fetal ileus.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Polyhydramnios
    term:
      id: HP:0001561
      label: Polyhydramnios
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Less than half of the pregnancies (6/14) were complicated by at least one of the following: Intrauterine growth retardation (5/14), polyhydramnios (5/14), single umbilical artery (2/14), and premature birth (5/14)."
    explanation: Five of fourteen.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The pregnancy was complicated with polyhydroamniosis, single umbilical artery, and fetal ileus diagnosed prenatally."
    explanation: Polyhydramnios alongside prenatally detected fetal ileus in the Polish patient, quoted with the source's spelling.
- category: Clinical
  name: Premature birth
  description: Preterm delivery in five of the first fourteen patients, usually after a pregnancy complicated by growth restriction or polyhydramnios.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Premature birth
    term:
      id: HP:0001622
      label: Premature birth
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Less than half of the pregnancies (6/14) were complicated by at least one of the following: Intrauterine growth retardation (5/14), polyhydramnios (5/14), single umbilical artery (2/14), and premature birth (5/14)."
    explanation: Five of fourteen.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 30 | ZNF699 | NM_198535.2 : c.349dupA | p.Ile117fs | Hom | Yes, yes | Syndactyly, muscular hypotonia, intrauterine growth retardation, premature birth, abnormal facial shape, congenital onset, intestinal atresia |"
    explanation: Premature birth among patient 30's HPO terms; also listed for patients 26 and 35.
- category: Cardiovascular
  name: Atrial septal defect
  description: >-
    Congenital heart disease is part of the acronym but was the least burdensome
    organ system in the first fourteen patients: atrial septal defect and pulmonary
    stenosis in two each, with single cases of ventricular septal defect, dysplastic
    pulmonary valve, patent foramen ovale, patent ductus and persistent left superior
    vena cava, and none requiring intervention.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Atrial septal defect
    term:
      id: HP:0001631
      label: Atrial septal defect
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Atrial septal defect (2/14), pulmonic stenosis (2/14) and individual cases of persistent left superior vena cava, ventricular septal defect, dysplastic pulmonary valve, patent formanem ovale, and patent ductus arteriosus."
    explanation: The cardiac inventory of the first fourteen patients.
- category: Cardiovascular
  name: Pulmonic stenosis
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Pulmonic stenosis
    term:
      id: HP:0001642
      label: Pulmonic stenosis
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Atrial septal defect (2/14), pulmonic stenosis (2/14) and individual cases of persistent left superior vena cava, ventricular septal defect, dysplastic pulmonary valve, patent formanem ovale, and patent ductus arteriosus."
    explanation: Two of fourteen.
- category: Cardiovascular
  name: Patent ductus arteriosus
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Patent ductus arteriosus
    term:
      id: HP:0001643
      label: Patent ductus arteriosus
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "a patent ductus arteriosus was noted on screening echocardiogram"
    explanation: A hemodynamically insignificant PDA in the Middle Eastern patient.
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The patient's past medical history included leukopenia, recurrent pneumonia, immunodeficiency, patent ductus arteriosus, and patent foramen ovale."
    explanation: PDA in the Chinese airway patient.
- category: Genitourinary
  name: Renal hypoplasia
  description: Renal hypoplasia or dysplasia in three of the first fourteen patients, progressing to chronic kidney disease in two.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Renal hypoplasia
    term:
      id: HP:0000089
      label: Renal hypoplasia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Renal hypoplasia (3/14), cryptorchidism (3/14), chronic kidney disease (2/14), and ambiguous (2/14), hypospadias (1/14), and chordee (1/14) were the observed symptoms from the genitourinary system."
    explanation: The genitourinary inventory of the first fourteen patients.
  sequelae:
  - target: Chronic kidney disease
    evidence:
    - reference: PMID:33875846
      reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "bilateral renal dysplasia, chronic kidney disease"
      explanation: Patient 29's HPO terms, in which renal dysplasia and chronic kidney disease co-occur.
- category: Genitourinary
  name: Chronic kidney disease
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Chronic kidney disease
    term:
      id: HP:0012622
      label: Chronic kidney disease
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "cryptorchidism (3/14), chronic kidney disease (2/14), and ambiguous (2/14)"
    explanation: Two of fourteen.
- category: Genitourinary
  name: Cryptorchidism
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Cryptorchidism
    term:
      id: HP:0000028
      label: Cryptorchidism
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Renal hypoplasia (3/14), cryptorchidism (3/14), chronic kidney disease (2/14)"
    explanation: Three of fourteen.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He had good urine output, but testes were undescended bilaterally."
    explanation: Bilateral cryptorchidism in a later case.
- category: Genitourinary
  name: Hypospadias
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Hypospadias
    term:
      id: HP:0000047
      label: Hypospadias
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "hypospadias (1/14), and chordee (1/14)"
    explanation: One of fourteen, with chordee.
- category: Genitourinary
  name: Ambiguous genitalia
  description: Ambiguous genitalia in two of the first fourteen patients; the reports do not state chromosomal sex, so the sex-neutral term is bound.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Ambiguous genitalia
    term:
      id: HP:0000062
      label: Ambiguous genitalia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Renal hypoplasia (3/14), cryptorchidism (3/14), chronic kidney disease (2/14), and ambiguous (2/14), hypospadias (1/14), and chordee (1/14) were the observed symptoms from the genitourinary system."
    explanation: Ambiguous genitalia in two of fourteen.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "| 35 | ZNF699 | NM_198535.2 : c.436_439del | p.Asp146Ilefs*10 | Hom | Yes, no | Abnormal facial shape, abnormal myelination, absent thumb, ambiguous genitalia"
    explanation: Table 1 row for patient 35.
- category: Skeletal
  name: Syndactyly
  description: Cutaneous syndactyly, most often of the second and third toes, in half of the first fourteen patients.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Syndactyly
    term:
      id: HP:0001159
      label: Syndactyly
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Skeletal anomalies included syndactyly (7/14), polydactyly (2/14), brachydactyly, absent thumbs, talipes equinovarus, and genu valgum."
    explanation: Seven of fourteen.
- category: Skeletal
  name: Preaxial polydactyly
  description: Preaxial polydactyly, usually a duplicated thumb, in two of the first fourteen patients; the founding report treats preaxial polydactyly and absent thumbs as the two ends of one thumb-ray anomaly.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Preaxial polydactyly
    term:
      id: HP:0100258
      label: Preaxial polydactyly
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Skeletal anomalies included syndactyly (7/14), polydactyly (2/14), brachydactyly, absent thumbs"
    explanation: Two of fourteen.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "right preaxial polydactyly, and bilateral syndactyly of the second and third toes"
    explanation: Patient 27's limb findings.
- category: Skeletal
  name: Absent thumb
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Absent thumb
    term:
      id: HP:0009777
      label: Absent thumb
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patient 35, male index with coarse face, broad eyebrows, long palpebral fissures, wide mouth, thin vermilion of the upper lip, and bilateral absent thumbs."
    explanation: Bilateral absent thumbs in patient 35.
- category: Skeletal
  name: Talipes equinovarus
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Talipes equinovarus
    term:
      id: HP:0001762
      label: Talipes equinovarus
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He had bilateral talipes equinovarus, congenital vertical talus bilaterally, rocker bottom feet (Figure 2), long fingers, contractures of both elbows and both knees, and syndactyly of the third and fourth toes bilaterally."
    explanation: Bilateral clubfoot with vertical talus and joint contractures.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Skeletal anomalies included syndactyly (7/14), polydactyly (2/14), brachydactyly, absent thumbs, talipes equinovarus, and genu valgum."
    explanation: Talipes among the skeletal anomalies of the first fourteen.
- category: Hematologic
  name: Anemia
  description: Anemia in six of the first fourteen patients, in one requiring transfusion; congenital hypoplastic anemia and iron deficiency anemia are each recorded once in the founding cohort.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Anemia
    term:
      id: HP:0001903
      label: Anemia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In the laboratory findings, the most frequently reported deviation was in the complete blood count (8/14), two patients had pancytopenia, and six patients had anemia."
    explanation: Six of fourteen.
- category: Hematologic
  name: Pancytopenia
  description: >-
    Pancytopenia in two of the first fourteen patients. A 2025 report describes a
    patient evaluated for suspected inherited bone marrow failure before DEGCAGS was
    diagnosed.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Pancytopenia
    term:
      id: HP:0001876
      label: Pancytopenia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "complete blood count (8/14), two patients had pancytopenia, and six patients had anemia"
    explanation: Two of fourteen.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Other common features included anemia/pancytopenia, premature graying of hair, and sensorineural hearing impairment."
    explanation: Listed as a common feature.
- category: Immunologic
  name: Combined immunodeficiency
  description: >-
    Combined T-low B-negative immunodeficiency by ESID criteria in a 20-year-old:
    B cells 2 percent, reduced naive CD4 and CD8 T cells, impaired mitogen
    proliferation and reduced KRECs, with preserved TRECs, T-cell repertoire,
    immunoglobulins, isohemagglutinins and pneumococcal responses. Earlier cohorts
    recorded "immunodeficiency" as an HPO term in two patients without
    characterisation, which is curated separately under Immunodeficiency; the
    combined-immunodeficiency diagnosis rests on this single patient.
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Combined immunodeficiency
    term:
      id: HP:0005387
      label: Combined immunodeficiency
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Based on infectious history and immunological findings, a diagnosis of combined immunodeficiency (CID) was made according to European Society for Immunodeficiencies (ESID) criteria."
    explanation: The formal diagnosis.
  sequelae:
  - target: Recurrent infections
    evidence:
    - reference: PMID:42534679
      reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "recurrent upper and lower respiratory infections requiring frequent antibiotic treatments and hospital admissions"
      explanation: The infectious history that led to the immunological work-up.
- category: Immunologic
  name: Immunodeficiency
  description: >-
    Immunodeficiency recorded without further characterisation in two of the first
    fourteen patients and in the Chinese airway patient, with leukopenia and recurrent
    pneumonia. Immunodeficiency or recurrent infection is reported in about two fifths
    of the 2024 cohort. The one immunologically characterised patient met criteria
    for combined immunodeficiency, curated separately.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Immunodeficiency
    term:
      id: HP:0002721
      label: Immunodeficiency
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Five patients had recurrent infections, of those, two had confirmed immunodeficiency."
    explanation: Two of fourteen with confirmed immunodeficiency in the early cohort.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "immunodeficiency, tracheomalacia, bronchomalacia, chronic lung disease, short thumb, intestinal atresia, feeding difficulties, bilateral renal dysplasia, chronic kidney disease"
    explanation: Immunodeficiency among patient 29's HPO terms; also listed for patient 37.
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The patient's past medical history included leukopenia, recurrent pneumonia, immunodeficiency, patent ductus arteriosus, and patent foramen ovale."
    explanation: Immunodeficiency with leukopenia in the Chinese airway patient.
  sequelae:
  - target: Recurrent infections
    evidence:
    - reference: PMID:35205213
      reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Five patients had recurrent infections, of those, two had confirmed immunodeficiency."
      explanation: Recurrent infection is the presenting feature of the immunodeficiency in the early cohort.
- category: Immunologic
  name: Decreased total B cell count
  description: CD19+ B cells 2 percent of lymphocytes (33 cells per microlitre) with reduced KRECs, while rectal mucosal biopsy still showed class-switched plasma cells. A single patient.
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Severe B cell depletion
    term:
      id: HP:0010976
      label: Decreased total B cell count
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"
    explanation: The B-cell measurement.
- category: Immunologic
  name: Decreased naive CD4+ T cell proportion
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Decreased naive CD4+ T cell proportion
    term:
      id: HP:0410378
      label: Decreased naive CD4+ T cell proportion
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"
    explanation: Naive CD4 T cells at 12 percent, in a single patient.
- category: Immunologic
  name: Decreased naive CD8+ T cell proportion
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Decreased naive CD8+ T cell proportion
    term:
      id: HP:0410377
      label: Decreased naive CD8+ T cell proportion
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The immunological work-up revealed a significant reduction of CD4+CD45RA+ naïve T cells (12%), CD8+CD45RA+ naïve T cells (42%), and CD19+ B cells"
    explanation: Naive CD8 T cells at 42 percent, in the same single patient.
- category: Immunologic
  name: Recurrent infections
  description: >-
    Recurrent infection in five of the first fourteen patients, including repeated
    bacterial sepsis in infancy and recurrent pneumonia; in the adult, recurrent lower
    respiratory infection had produced bilateral bronchiectasis and bronchiolitis
    obliterans by adolescence.
  frequency: FREQUENT
  phenotype_term:
    preferred_term: Recurrent infections
    term:
      id: HP:0002719
      label: Recurrent infections
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Five patients had recurrent infections, of those, two had confirmed immunodeficiency."
    explanation: Five of fourteen.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    quote_role: BACKGROUND
    evidence_source: HUMAN_CLINICAL
    snippet: "Immunodeficiency and/or recurrent infections are reported in 42.3% of patients"
    explanation: The 2024 cohort frequency, as summarised by the immunology report.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Due to severe infections (SARS-CoV-2 and three bacterial sepsis), the girl was hospitalized in the ICU."
    explanation: Three episodes of bacterial sepsis in the first year of life.
  sequelae:
  - target: Bronchiectasis
    evidence:
    - reference: PMID:42534679
      reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "High-resolution computed tomography scan revealed bilateral diffuse bronchiectasis, bronchiolectasis, and obliterans bronchiolitis."
      explanation: Structural lung damage following recurrent infection in the adult patient.
- category: Respiratory
  name: Bronchiectasis
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Bronchiectasis
    term:
      id: HP:0002110
      label: Bronchiectasis
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "High-resolution computed tomography scan revealed bilateral diffuse bronchiectasis, bronchiolectasis, and obliterans bronchiolitis."
    explanation: Bilateral bronchiectasis in the single adult reported.
- category: Respiratory
  name: Laryngomalacia
  description: Laryngomalacia, tracheomalacia and bronchomalacia recur across the cohort and present as stridor, choking with feeds and, in the worst cases, respiratory failure needing tracheostomy.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Laryngomalacia
    term:
      id: HP:0001601
      label: Laryngomalacia
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In the respiratory tract, abnormalities concerned laryngomalacia, tracheomalacia, and bronchomalacia."
    explanation: The airway inventory of the first fourteen patients.
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Fiberoptic nasopharyngoscopy demonstrated bilateral vocal cord dysfunction and laryngomalacia."
    explanation: Endoscopically confirmed laryngomalacia with vocal cord dysfunction.
- category: Respiratory
  name: Tracheomalacia
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Tracheomalacia
    term:
      id: HP:0002779
      label: Tracheomalacia
  evidence:
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "immunodeficiency, tracheomalacia, bronchomalacia, chronic lung disease, short thumb, intestinal atresia, feeding difficulties, bilateral renal dysplasia, chronic kidney disease"
    explanation: Patient 29's HPO terms; tracheomalacia is also listed for patient 38.
- category: Respiratory
  name: Hamartoma
  description: >-
    Multiple laryngeal, nasopharyngeal and tongue-base hamartomas in a one-year-old
    with progressive stridor, initially attributed to laryngomalacia and resected
    with supraglottoplasty. A single report, and the first benign mass lesion
    described in the syndrome.
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Laryngeal and nasopharyngeal hamartomas
    term:
      id: HP:0010566
      label: Hamartoma
  evidence:
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Surgical resection of nasopharyngeal and tongue-base masses with supraglottoplasty was performed. Histopathology confirmed hamartomas."
    explanation: Histological confirmation of the resected masses.
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "presented with progressive stridor, hoarseness, respiratory distress, and feeding difficulties since birth"
    explanation: The presentation.
- category: Respiratory
  name: Neonatal respiratory distress
  description: >-
    Apnea, bradycardia and hypotension at birth needing resuscitation and positive
    pressure ventilation in the most severely affected neonates, with failure to
    wean and eventual tracheostomy in two reported infants. Left unconnected in the
    pathograph because the reports do not say whether it is the hypotonia, the
    airway malacia or a central respiratory drive problem.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Neonatal respiratory distress
    term:
      id: HP:0002643
      label: Neonatal respiratory distress
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Post-partum medical problems included hypotension, generalized hypotonia, bradycardia, apnea requiring resuscitation and positive pressure ventilation, facial dysmorphia, skeletal malformations, and disorders of the gastrointestinal, immune, urinary, respiratory, cardiac, and visual systems."
    explanation: The neonatal course of the Middle Eastern patient.
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Shortly after birth, the patient required respiratory resuscitation, facial CPAP, and on the first day of life, was transferred to Newborn Intensive Care Unit (NICU) due to the severe general condition."
    explanation: Resuscitation and CPAP at birth in the Polish patient.
- category: Ophthalmologic
  name: Strabismus
  description: Strabismus in the founding cohort; exotropia in primary gaze with a drift on adduction in the patient with detailed ophthalmological examination, along with torpedo-like maculopathy and increased optic disc cupping.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Strabismus
    term:
      id: HP:0000486
      label: Strabismus
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He had exotropia in primary gaze"
    explanation: The strabismus finding.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He had torpedo-like maculopathy changes in both eyes with increased cupping of the optic disks."
    explanation: The retinal findings reported alongside it, which have no more specific HPO binding in this entry.
- category: Ophthalmologic
  name: Ptosis
  description: >-
    Bilateral partial ptosis with infrequent blinking in the neonate with detailed
    ophthalmological examination, and an HPO term of patient 32 in the founding
    cohort. The reporting ophthalmologists offer two readings, a figure legend
    attributing it to hypotony and a discussion raising a possible synaptic problem,
    so the entry does not wire it to the hypotonia node.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Ptosis
    term:
      id: HP:0000508
      label: Ptosis
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He had bilateral ptosis with infrequent and incomplete blinking bilaterally in early infancy"
    explanation: The ptosis observation.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The child reported here had bilateral partial ptosis and some limitation of adduction OU, possibly implying a synaptic problem."
    explanation: The authors' alternative mechanistic reading, which is why the ptosis is left unconnected in the pathograph.
- category: Ophthalmologic
  name: Retinal vascular tortuosity
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Increased retinal vessel tortuosity
    term:
      id: HP:0012841
      label: Retinal vascular tortuosity
  evidence:
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Other features included bilateral pyelectasis, left ventricular hypertrabeculation, hypermetropia, increased retinal vessel tortuosity, and hyperemic optic disc with blurred margins."
    explanation: Retinal vessel tortuosity in the adult patient.
- category: Dental
  name: Taurodontia
  description: >-
    Taurodontism of the first permanent molars, shortened mandibular incisor roots,
    enamel hypomineralization of primary molars, talon cusps and generalized spacing
    in the first oro-dental description of the syndrome.
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Taurodontism
    term:
      id: HP:0000679
      label: Taurodontia
  evidence:
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Radiographic evaluation revealed taurodontism, particularly in teeth 16 and 26, shortened roots in the mandibular incisors, and increased pericoronal space associated with developing teeth."
    explanation: The radiographic dental findings.
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Intraoral findings included generalized spacing, gingivitis, active carious lesions, hypomineralization of primary molars, talon cusps on the maxillary central incisors, erosive tooth wear, and signs consistent with sleep bruxism."
    explanation: The intraoral findings.
- category: Dental
  name: Enamel hypomineralization
  description: Hypomineralization of the primary molars in the 10-year-old Brazilian patient. The authors describe it as multifactorial, with reflux and supplement use as contributors, so it is left unconnected in the pathograph.
  frequency: VERY_RARE
  phenotype_term:
    preferred_term: Enamel hypomineralization
    term:
      id: HP:0006285
      label: Enamel hypomineralization
  evidence:
  - reference: PMID:42569837
    reference_title: "Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Intraoral findings included generalized spacing, gingivitis, active carious lesions, hypomineralization of primary molars, talon cusps on the maxillary central incisors, erosive tooth wear, and signs consistent with sleep bruxism."
    explanation: Hypomineralization of the primary molars.
biochemical:
- name: DEGCAGS blood DNA methylation episignature
  presence: PRESENT
  context: >-
    Peripheral-blood genome-wide DNA methylation biomarker used to screen for,
    diagnose and classify ZNF699 variants; established as a diagnostic classifier,
    not as a causal mediator or severity marker.
  cell_types:
  - preferred_term: peripheral blood leukocyte
    term:
      id: CL:0000738
      label: leukocyte
  readouts:
  - target: Biallelic ZNF699 Loss of Function
    relationship: READOUT_OF
    direction: PRESENT_ABSENT
    endpoint_context: DIAGNOSTIC
    evidence:
    - reference: PMID:39424669
      reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "DEGCAGS syndrome is a clinically variable recessive syndrome even among siblings with a distinct methylation episignature which can be used as a screening, diagnostic and classification tool for ZNF699 variants."
      explanation: The episignature reads out the biallelic genotype and is offered as a variant classifier.
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We also identified a robust episignature for DEGCAGS syndrome."
    explanation: Discovery of the signature in nine profiled patients.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "a high confidence match with an methylation variant pathogenicity (MVP) of 0.891 was found for the episignature associated with DEGCAGS"
    explanation: Independent diagnostic use, resolving a KRAB-domain missense VUS that exome analysis had twice missed.
  notes: >-
    Recorded under biochemical as a biomarker, in parallel with the pathophysiology
    node that carries the same observation as a candidate mechanism. The biomarker
    claim is established; the mechanistic one is the entry's open hypothesis.
diagnosis:
- name: Molecular genetic testing for biallelic ZNF699 variants
  description: >-
    Diagnosis is by identification of biallelic pathogenic ZNF699 variants, in
    practice by exome or genome sequencing. Because the gene-disease association
    dates from 2021, exomes analysed before then and clinical-exome panels that omit
    ZNF699 can miss it, and reanalysis is warranted in undiagnosed patients with a
    compatible phenotype.
  diagnosis_term:
    preferred_term: molecular genetic testing
    term:
      id: NCIT:C15709
      label: Genetic Testing
    qualifiers:
    - predicate:
        preferred_term: has participant
        term:
          id: RO:0000057
          label: has participant
      value:
        preferred_term: ZNF699
        term:
          id: hgnc:24750
          label: ZNF699
  results: Biallelic loss-of-function or episignature-supported missense ZNF699 variants establish the molecular diagnosis.
  evidence:
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A 1-year-old girl with DEGCAGS syndrome (confirmed by ZNF699 mutation via whole-exome sequencing)"
    explanation: Exome-based confirmation in a later case.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "This evidence further emphasizes the importance of reanalysis of results of genetic testing over time."
    explanation: The lesson of a patient whose 2018 exome and 2022 clinical exome both missed ZNF699.
- name: DNA methylation episignature analysis
  description: >-
    Genome-wide blood DNA methylation profiling against the DEGCAGS episignature
    classifies patients from controls and carriers and can resolve a ZNF699 variant
    of uncertain significance, which matters because no functional assay for the
    protein exists. The signature is offered as a screening, diagnostic and
    classification tool.
  diagnosis_term:
    preferred_term: genome-wide DNA methylation episignature analysis
    term:
      id: NCIT:C63328
      label: DNA Methylation Analysis
  results: A high-confidence match to the DEGCAGS episignature supports pathogenicity of a candidate ZNF699 genotype.
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "DEGCAGS syndrome is a clinically variable recessive syndrome even among siblings with a distinct methylation episignature which can be used as a screening, diagnostic and classification tool for ZNF699 variants."
    explanation: The proposed diagnostic use.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "the presence of a gene-specific episignature provides an orthogonal and widely accepted line of evidence to support pathogenicity in disorders associated with aberrant DNA methylation"
    explanation: The episignature used as the deciding evidence for a KRAB-domain missense VUS.
treatments:
- name: Surgical Repair of Intestinal Atresia
  therapeutic_modality: SURGERY
  description: >-
    Laparotomy with resection and anastomosis for jejunal or multilevel intestinal
    atresia in the first days of life, with repeat operations for adhesions and
    anastomotic narrowing in some patients. Intestinal atresia was the reason for
    multiple operations in nine of the first fourteen patients.
  treatment_term:
    preferred_term: laparotomy with intestinal resection and anastomosis
    term:
      id: NCIT:C15329
      label: Surgical Procedure
  target_mechanisms:
  - target: Intestinal atresia
    evidence:
    - reference: PMID:35205213
      reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "The patient had a laparotomy with a massive short bowel resection (due to a multi-level obstruction of the jejunum-intestinal atresia) with one anastomosis on day 5 of life."
      explanation: The index surgery in the Polish patient.
  evidence:
  - reference: PMID:35205213
    reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The patient underwent two more laparotomies due to digestive tract passage disorders, during which abdominal adhesions were removed and the anastomosis was resected due to its narrowing."
    explanation: The reoperation burden.
- name: Parenteral and Enteral Nutritional Support
  description: >-
    Total parenteral nutrition with trophic naso-intestinal feeding after short bowel
    resection, nasogastric feeding for poor suck and dysphagia, and gastrostomy with
    fundoplication for aspiration and reflux.
  treatment_term:
    preferred_term: parenteral and tube nutritional support
    term:
      id: NCIT:C15433
      label: Nutritional Support
  target_mechanisms:
  - target: Feeding difficulties
    evidence:
    - reference: PMID:35205213
      reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Due to feeding intolerance, total parental nutrition was required all the time, the patient received trophic nutrition through a naso-intestinal tube."
      explanation: Parenteral nutrition for feeding intolerance.
  evidence:
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "at the age of 75 days, he received a tracheostomy and gastrostomy tube with fundoplication"
    explanation: Gastrostomy with fundoplication in the ventilator-dependent infant.
- name: Airway Surgery for Laryngeal Hamartoma
  therapeutic_modality: SURGERY
  description: >-
    Resection of nasopharyngeal and tongue-base hamartomas with supraglottoplasty,
    after which the infant achieved stable respiration and normal feeding with no
    recurrence at two months. A single case.
  treatment_term:
    preferred_term: hamartoma resection with supraglottoplasty
    term:
      id: NCIT:C15329
      label: Surgical Procedure
  target_mechanisms:
  - target: Hamartoma
    evidence:
    - reference: PMID:41205195
      reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Surgical resection of nasopharyngeal and tongue-base masses with supraglottoplasty was performed."
      explanation: The procedure.
  - target: Laryngomalacia
    evidence:
    - reference: PMID:41205195
      reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Fiberoptic nasopharyngoscopy demonstrated bilateral vocal cord dysfunction and laryngomalacia."
      explanation: The supraglottoplasty component addressed the coexisting laryngomalacia.
  evidence:
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Postoperatively, the patient required transient ICU support but achieved stable respiration and normal feeding by discharge."
    explanation: The outcome.
- name: Antibiotic Treatment of Recurrent Infections
  therapeutic_modality: SMALL_MOLECULE
  description: >-
    Repeated courses of antibiotics and hospital admission for recurrent
    sinopulmonary infection and, in infancy, bacterial sepsis. No report describes
    immunoglobulin replacement or prophylaxis, which is consistent with the one
    characterised patient having normal immunoglobulins and vaccine responses.
  treatment_term:
    preferred_term: antibiotic therapy
    term:
      id: NCIT:C15620
      label: Antibiotic Therapy
  target_mechanisms:
  - target: Recurrent infections
    evidence:
    - reference: PMID:42534679
      reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "recurrent upper and lower respiratory infections requiring frequent antibiotic treatments and hospital admissions"
      explanation: Antibiotic treatment of the recurrent infections.
- name: Multidisciplinary Supportive Care
  description: >-
    Intensive care and tracheostomy for neonatal respiratory failure, transfusion
    for anemia, and long-term multidisciplinary follow-up spanning neurology,
    ophthalmology, genetics, nutrition and rehabilitation. There is no
    disease-modifying therapy.
  treatment_term:
    preferred_term: multidisciplinary supportive care
    term:
      id: NCIT:C15747
      label: Supportive Care
  target_mechanisms:
  - target: Neonatal respiratory distress
    evidence:
    - reference: PMID:35205213
      reference_title: "Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "During one of the ICU stays, a tracheostomy was developed due to respiratory failure."
      explanation: Tracheostomy for respiratory failure.
  evidence:
  - reference: PMID:41205195
    reference_title: "Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "underscores the importance of a multidisciplinary approach to diagnosis and management"
    explanation: The management principle the airway report draws.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "He developed neonatal jaundice that was treated with phototherapy, and anemia was treated with packed red blood cell transfusions."
    explanation: Transfusion for anemia in the neonatal period.
discussions:
- discussion_id: znf699_function_unknown
  kind: KNOWLEDGE_GAP
  status: OPEN
  attaches_to:
  - pathophysiology#Biallelic ZNF699 Loss of Function
  - pathophysiology#Disrupted Embryonic Organ Morphogenesis
  prompt: >-
    What does ZNF699 bind, what does it repress, and in which developing tissues does
    its loss matter?
  rationale: >-
    Every mechanistic statement in this entry is an inference from protein family.
    ZNF699 is a KRAB zinc finger protein, so it is presumed to recruit KAP1-dependent
    repressive chromatin to a set of genomic targets, but no binding site, target
    gene or expression consequence has been reported, no animal or cellular model
    exists, and the only functional literature on the gene concerns ethanol
    tolerance in the distantly related Drosophila gene hangover and candidate-gene
    association with alcohol dependence. The founding report called for functional work in 2021
    and none has appeared. Until it does, the pathograph cannot say why the gut,
    heart, kidney, limb, brain and marrow are the organs affected, or why the
    anomalies are discordant between siblings.
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "ZNF699 encodes a KRAB zinc finger protein of unknown function."
    explanation: The gap, stated by the largest cohort.
  - reference: PMID:33875846
    reference_title: "Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "little is known about the function of this gene, which was initially described in Drosophila in a study of alcohol dependence."
    explanation: The founding report's statement of the same gap and of the only prior literature.
  - reference: PMID:42534679
    reference_title: A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "no validated experimental system is currently available to functionally assess ZNF699"
    explanation: Why missense variants are currently classified by episignature rather than by assay.
  proposed_experiments:
  - experiment_id: exp_degcags_znf699_null_ipsc_occupancy_methylation
    name: ZNF699 ChIP-seq and methylation profiling in ZNF699-null human iPSC-derived lineages
    description: >-
      Generate biallelic ZNF699 knockout iPSCs and profile ZNF699 genomic occupancy in
      the parental line, then compare DNA methylation and transcription at bound loci
      between null and parental cells differentiated toward intestinal, cardiac and
      hematopoietic lineages.
    would_support:
    - mechanistic_hypotheses#epigenetic_mediation
    supporting_outcome:
    - >-
      A definable set of ZNF699-bound loci that lose methylation and gain expression
      in null cells, enriched for developmental regulators of the affected organs,
      and overlapping the differentially methylated regions of the blood
      episignature.
    refuting_outcome:
    - >-
      No reproducible binding sites, or bound loci whose methylation and expression
      are unchanged in null cells, would indicate that the episignature is a
      downstream or cell-type-restricted consequence rather than the mechanism.
- discussion_id: degcags_sibling_discordance_and_mortality
  kind: KNOWLEDGE_GAP
  status: OPEN
  attaches_to:
  - pathophysiology#Disrupted Embryonic Organ Morphogenesis
  prompt: >-
    Why are the organ anomalies discordant between full siblings homozygous for the
    same ZNF699 allele, and what determines infant survival?
  rationale: >-
    The 2024 cohort makes discordance among full siblings and infant mortality
    defining features of the syndrome. The founding cohort recorded one evaluated
    child dead at nine months and eight infant deaths among siblings of the
    identified children, without their cause; eight of its thirteen patients carried
    the same c.436_439del allele with widely different anomaly sets, so the allele
    does not fix the phenotype. Stochastic developmental variation, modifier loci in
    these consanguineous pedigrees, or an environmental contribution are all open.
    No report has addressed which organ-system involvement predicts death, so the
    entry cannot connect infant mortality to any node, and because HPO's Death in
    infancy is a clinical-course term outside this schema's phenotype enum, the
    mortality is recorded here and in the description rather than as a phenotype.
  evidence:
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "is caused by biallelic, loss-of-function (LoF) ZNF699 variants, and is characterized by variable neurodevelopmental disability, discordant organ anomalies among full siblings and infant mortality."
    explanation: Discordance and infant mortality named together as defining features.
  - reference: PMID:38014480
    reference_title: "Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities."
    supports: SUPPORT
    quote_role: BACKGROUND
    evidence_source: HUMAN_CLINICAL
    snippet: "identified 13 children from 12 consanguineous families who had DEGCAGS syndrome that proved to be variable in presentation and sufficiently severe that one evaluated child died prior to their report and eight siblings of the identified children died in infancy"
    explanation: The sibling deaths in the founding cohort, as summarised in a later report's introduction.
  - reference: PMID:39424669
    reference_title: Epigenomic and phenotypic characterization of DEGCAGS syndrome.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "a highly variable condition lacking pathognomonic clinical findings"
    explanation: The authors' characterisation of the variability, and their motivation for seeking an episignature.
notes: >-
  Provenance, so a reader can calibrate the entry. No GeneReviews chapter exists for
  DEGCAGS syndrome (offline Bookshelf index and live PubMed title search, September
  2026), and there is no Orphanet entry or ClinGen gene-disease validity assertion in
  the structured caches, so the entry is built from the primary literature. The
  spine is the founding report (PMID:33875846, whose cached full text includes the
  Table 1 HPO inventory for all thirteen patients), the fourteen-patient frequency
  synthesis of Biela et al. (PMID:35205213, full text), and the 30-patient
  epigenomic cohort of Karimi et al. (PMID:39424669, abstract only in the cache).
  The ocular (PMID:38014480), airway (PMID:41205195), immunological (PMID:42534679)
  and oro-dental (PMID:42569837) case reports supply the newer phenotypes. Two
  further reports could not be quoted: the 2025 hematology report (PMID:40790844)
  has no abstract in the cache and is cited in references only, and the 2026
  Chinese case report (PMID:42527142) fetched without a retrievable abstract and is
  neither cited nor committed. The hangover association paper (PMID:16940975) is
  cited once, for the weakness of the orthology claim.

  Deep research was requested from falcon, which was not configured, and the run
  fell back to OpenScientist (research/DEGCAGS_Syndrome-deep-research-openscientist.md,
  whose frontmatter records the fallback). Its 15 citations all resolved; three
  general KRAB-ZFP retrotransposon-silencing papers were flagged as off topic and
  were not cited, and its one obsolete term (GO:0006306) was not bound. The report
  cites the same DEGCAGS primary papers this entry does; the one addition taken from
  it is the KRAB-KAP1 structural study (PMID:36341546) on the mechanistic
  hypothesis. The report also relays full-text figures from Karimi et al. (a
  26-patient frequency table, three deaths with causes, 15 variants, about 210
  differentially methylated regions) that could not be curated because only the
  abstract is cached.

  Frequencies are Biela's counts over fourteen patients mapped to the enum bands
  (5 to 29 percent OCCASIONAL, 30 to 79 percent FREQUENT), which is a small
  denominator. Phenotypes reported once are VERY_RARE.

  Deliberately left unconnected in the pathograph: Neonatal respiratory distress,
  Premature graying of hair, Ptosis, Retinal vascular tortuosity, Intrauterine growth
  retardation, Polyhydramnios, Premature birth, Hepatosplenomegaly, Dolichocephaly
  and Enamel hypomineralization, because no report attributes them to a mechanism
  (the ophthalmologists reporting the ptosis offered two readings; the prenatal
  features are growth and amniotic findings that the organ-malformation node does not
  explain; the dental report's authors invoke positional and multifactorial causes
  for the last two). The methylation episignature appears twice on purpose, as a
  biochemical biomarker (established) and as a pathophysiology node whose outgoing
  edges carry the epigenetic-mediation hypothesis (not established). The GO binding
  on the genetic lesion node is inferred from the KRAB domain and says so in the
  descriptor's description.

  A pre-PR review round (independent agent, dismech-pr-review checklist) led to:
  splitting Synophrys from Thick eyebrow; adding Immunodeficiency (HP:0002721) so the
  single-patient Combined immunodeficiency could drop to VERY_RARE; VERY_RARE on the
  other single-patient immune and lung findings; removing the hypotonia-to-ptosis
  sequela and the morphogenesis-to-IUGR edge; regrading the KRAB-domain sentence as
  restated background; softening the hangover orthology claim; and adding
  Polyhydramnios and Premature birth from the frequency table.

  The PR review round set Coarse facial features to FREQUENT, since the only cached
  frequency is Biela's abnormal facial shape in 9 of 14, and added the single- or
  two-patient findings the reviewer listed from the cached full texts: Thin upper lip
  vermilion, Dolichocephaly, Craniosynostosis, Agenesis of corpus callosum,
  Ventriculomegaly, Hepatosplenomegaly and Enamel hypomineralization. Still
  deliberately left out as single mentions without a clean binding decision: vocal
  cord paralysis (patient 26; the airway patient had vocal cord dysfunction, a
  different finding), surgically corrected intestinal malrotation and cutis marmorata
  in the dental report, and talon cusps and cholestasis.

📚

References & Deep Research

References

PMID:33875846

Combining exome/genome sequencing with data repository analysis reveals novel gene-disease associations for a wide range of genetic disorders.

No top-level findings curated for this source.

PMID:35205213

Further Delineation of Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities Caused by ZNF699 Gene Mutation.

No top-level findings curated for this source.

PMID:36607994

Next generation phenotyping with quantitative narration for DEGCAGS syndrome.

No top-level findings curated for this source.

PMID:38014480

Clinical and ocular abnormalities in DEGCAGS syndrome-Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities.

No top-level findings curated for this source.

PMID:39424669

Epigenomic and phenotypic characterization of DEGCAGS syndrome.

No top-level findings curated for this source.

PMID:40790844

Hematologic Findings in DEGCAGS Syndrome: A Diagnostic Consideration in a Patient With Suspected Inherited Bone Marrow Failure.

No top-level findings curated for this source.

PMID:41205195

Novel Airway Challenges in DEGCAGS Syndrome: Managing Infant Laryngeal Hamartomas.

No top-level findings curated for this source.

PMID:42534679

A novel ZNF699 mutation in a patient with DEGCAGS syndrome and severe B cell depletion.

No top-level findings curated for this source.

PMID:42569837

Expanding the Phenotypic Spectrum of Degcags Syndrome: Novel Craniofacial and Oral Findings.

No top-level findings curated for this source.

PMID:36341546

Structure and functional mapping of the KRAB-KAP1 repressor complex.

No top-level findings curated for this source.

PMID:16940975

Alcohol dependence is associated with the ZNF699 gene, a human locus related to Drosophila hangover, in the Irish Affected Sib Pair Study of Alcohol Dependence (IASPSAD) sample.

No top-level findings curated for this source.

Deep Research

Deep research results are used as seeds for research; they do not undergo the same validation as the main records and may contain errors. How we use deep research.

Evaluations and curation notes (2)

Record notes

Provenance, so a reader can calibrate the entry. No GeneReviews chapter exists for DEGCAGS syndrome (offline Bookshelf index and live PubMed title search, September 2026), and there is no Orphanet entry or ClinGen gene-disease validity assertion in the structured caches, so the entry is built from the primary literature. The spine is the founding report (PMID:33875846, whose cached full text includes the Table 1 HPO inventory for all thirteen patients), the fourteen-patient frequency synthesis of Biela et al. (PMID:35205213, full text), and the 30-patient epigenomic cohort of Karimi et al. (PMID:39424669, abstract only in the cache). The ocular (PMID:38014480), airway (PMID:41205195), immunological (PMID:42534679) and oro-dental (PMID:42569837) case reports supply the newer phenotypes. Two further reports could not be quoted: the 2025 hematology report (PMID:40790844) has no abstract in the cache and is cited in references only, and the 2026 Chinese case report (PMID:42527142) fetched without a retrievable abstract and is neither cited nor committed. The hangover association paper (PMID:16940975) is cited once, for the weakness of the orthology claim. Deep research was requested from falcon, which was not configured, and the run fell back to OpenScientist (research/DEGCAGS_Syndrome-deep-research-openscientist.md, whose frontmatter records the fallback). Its 15 citations all resolved; three general KRAB-ZFP retrotransposon-silencing papers were flagged as off topic and were not cited, and its one obsolete term (GO:0006306) was not bound. The report cites the same DEGCAGS primary papers this entry does; the one addition taken from it is the KRAB-KAP1 structural study (PMID:36341546) on the mechanistic hypothesis. The report also relays full-text figures from Karimi et al. (a 26-patient frequency table, three deaths with causes, 15 variants, about 210 differentially methylated regions) that could not be curated because only the abstract is cached. Frequencies are Biela's counts over fourteen patients mapped to the enum bands (5 to 29 percent OCCASIONAL, 30 to 79 percent FREQUENT), which is a small denominator. Phenotypes reported once are VERY_RARE. Deliberately left unconnected in the pathograph: Neonatal respiratory distress, Premature graying of hair, Ptosis, Retinal vascular tortuosity, Intrauterine growth retardation, Polyhydramnios, Premature birth, Hepatosplenomegaly, Dolichocephaly and Enamel hypomineralization, because no report attributes them to a mechanism (the ophthalmologists reporting the ptosis offered two readings; the prenatal features are growth and amniotic findings that the organ-malformation node does not explain; the dental report's authors invoke positional and multifactorial causes for the last two). The methylation episignature appears twice on purpose, as a biochemical biomarker (established) and as a pathophysiology node whose outgoing edges carry the epigenetic-mediation hypothesis (not established). The GO binding on the genetic lesion node is inferred from the KRAB domain and says so in the descriptor's description. A pre-PR review round (independent agent, dismech-pr-review checklist) led to: splitting Synophrys from Thick eyebrow; adding Immunodeficiency (HP:0002721) so the single-patient Combined immunodeficiency could drop to VERY_RARE; VERY_RARE on the other single-patient immune and lung findings; removing the hypotonia-to-ptosis sequela and the morphogenesis-to-IUGR edge; regrading the KRAB-domain sentence as restated background; softening the hangover orthology claim; and adding Polyhydramnios and Premature birth from the frequency table. The PR review round set Coarse facial features to FREQUENT, since the only cached frequency is Biela's abnormal facial shape in 9 of 14, and added the single- or two-patient findings the reviewer listed from the cached full texts: Thin upper lip vermilion, Dolichocephaly, Craniosynostosis, Agenesis of corpus callosum, Ventriculomegaly, Hepatosplenomegaly and Enamel hypomineralization. Still deliberately left out as single mentions without a clean binding decision: vocal cord paralysis (patient 26; the airway patient had vocal cord dysfunction, a different finding), surgically corrected intestinal malrotation and cutis marmorata in the dental report, and talon cusps and cholestasis.

Create: DEGCAGS_Syndrome · 2026-09-22T20:35:54Z · View source

De novo curation of DEGCAGS syndrome (MONDO:0859181, ZNF699, OMIM 619488) for claim issue #10766. Deep research was requested from falcon, which was not configured (no EDISON_API_KEY); the run used --fallback and OpenScientist produced the report (research/DEGCAGS_Syndrome-deep-research-openscientist.md, fell_back recorded in frontmatter). All 15 of its citations resolved; three general KRAB-ZFP retrotransposon papers it flagged off-topic were not used, and its one obsolete term (GO:0006306) was not bound. The report cited the same primary DEGCAGS literature found by a direct PubMed search (esearch for DEGCAGS OR ZNF699), so the entry was built from that literature: the founding report PMID:33875846 (full text cached, including the Table 1 HPO inventory for all 13 patients), the 14-patient frequency synthesis PMID:35205213 (full text), the 30-patient epigenomic cohort PMID:39424669 (abstract only), and the ocular (PMID:38014480), airway (PMID:41205195), immunological (PMID:42534679) and oro-dental (PMID:42569837) case reports. The KRAB-KAP1 structural paper PMID:36341546 was taken from the report as INDIRECT IN_VITRO evidence on the emerging epigenetic-mediation hypothesis. PMID:40790844 (hematology, no cached abstract) is listed in references only; PMID:42527142 (Chinese case report) fetched empty and is mentioned in notes only. No GeneReviews chapter exists (just check-genereviews --online: NO_CHAPTER), no Orphanet entry or ClinGen assertion in the structured caches. Pathograph: five nodes (biallelic ZNF699 LoF; aberrant genome-wide DNA methylation; disrupted embryonic organ morphogenesis; impaired neurodevelopment; impaired hematopoiesis and lymphocyte development), with the methylation node's outgoing edges tagged to an EMERGING mechanistic hypothesis rather than asserted. After a pre-PR red-team review round (independent agent running the dismech-pr-review checklist; nine IMPORTANT findings, all taken: Synophrys split from Thick eyebrow, Immunodeficiency HP:0002721 added so the single-patient Combined immunodeficiency drops to VERY_RARE, single-patient immune and lung findings set VERY_RARE, hypotonia-to-ptosis sequela and morphogenesis-to-IUGR edge removed, KRAB-domain sentence regraded OTHER/BACKGROUND with the AlphaFold sentence added as COMPUTATIONAL, hangover orthology softened and PMID:16940975 cited, Polyhydramnios and Premature birth added; GO:0006325 swapped for GO:0040029 on the methylation node, NCIT:C15709 Genetic Testing on the molecular-diagnosis entry) the entry has 49 phenotypes, 42 causally connected; Neonatal respiratory distress, Premature graying of hair, Ptosis, Retinal vascular tortuosity, Intrauterine growth retardation, Polyhydramnios and Premature birth deliberately left unconnected. Six reference caches the research run fetched but the entry does not cite (PMID:21791101, 21876767, 22496453, 29482634, 30846446, 42527142) were not committed. PR review round (ai4c-reviewer, CHANGES_REQUESTED on one IMPORTANT finding): Coarse facial features set FREQUENT because the only cached frequency is Biela's abnormal facial shape 9/14 and the founding Table 1 names the term in only two rows; the two non-blocking suggestions were taken in the same push, adding Thin upper lip vermilion, Dolichocephaly, Craniosynostosis, Agenesis of corpus callosum, Ventriculomegaly, Hepatosplenomegaly and Enamel hypomineralization from the cached full texts, bringing the entry to 56 phenotypes, 46 causally connected, with 167/167 snippets verified. Vocal cord paralysis, intestinal malrotation, cutis marmorata, talon cusps and cholestasis were deliberately left out and listed in notes. Death in infancy (HP:0001522) was dropped as a phenotype because it is outside the PhenotypeTerm enum; infant mortality is recorded in the description and a KNOWLEDGE_GAP discussion. HP:0000062 Ambiguous genitalia was chosen over the sex-specific HP:0000033 after term validation flagged the label. Validation: just validate, validate-terms, count-verified-snippets (167/167), check-entity-refs, check-causal-targets, check-enum-values, check-duplicate-keys, check-qualifier-terms, check-snippet-length, check-title-snippets, check-snippet-grading, check-folded-hyphens, check-reference-titles, check-coarse-phenotypes and check-genereviews all pass; just validate-disorders run once at the end (result recorded in the PR).

OpenScientist ▸

DEGCAGS Syndrome: A Comprehensive Disease Characteristics Report

openscientist-autonomous 12 citations 2026-09-22T16:20:50.915875

DEGCAGS Syndrome: A Comprehensive Disease Characteristics Report

Disease: DEGCAGS Syndrome (Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities) MONDO ID: MONDO:0859181 · OMIM: #619488 · Gene: ZNF699 (OMIM 609571; 19p13.3) Category: Mendelian, autosomal recessive Report date:* 2026-09-22 · Evidence base: ~40 patients reported worldwide (largest cohort n=30)

Summary

DEGCAGS syndrome (OMIM #619488; MONDO:0859181) is an ultra-rare, autosomal-recessive, congenital-onset multisystem malformation and neurodevelopmental disorder caused by biallelic loss-of-function variants in ZNF699, a KRAB-domain C2H2 zinc-finger transcription-factor gene on chromosome 19p13.3. The disorder was first proposed as a novel gene–disease association in 2021 (Bertoli-Avella et al.) and substantially delineated in 2024 by Karimi et al., who assembled the largest cohort to date (30 affected individuals) and defined a reproducible blood DNA-methylation episignature that now serves as a diagnostic and variant-classification tool.

Clinically, DEGCAGS is characterized by near-universal coarse facial dysmorphism and global developmental delay/impaired intellectual development, accompanied by highly variable involvement of the gastrointestinal, cardiovascular, genitourinary, skeletal, dental, cutaneous, central nervous, hematologic/immune, sensory (sensorineural hearing loss, ocular), and airway systems. A hallmark of the disorder is marked clinical variability — including strikingly discordant organ anomalies among full siblings — together with significant infant and childhood mortality. Reported causes of death include heart failure from Tetralogy of Fallot, sepsis, and infection (Dengue).

Mechanistically, DEGCAGS is inferred to arise from loss of KRAB-zinc-finger-protein (KRAB-ZFP)/KAP1(TRIM28)-directed heterochromatin repression, consistent with the observed promoter-predominant hypermethylation episignature (which partially overlaps BAFopathy signatures) and with the general biology of KRAB-ZFPs. There is no targeted or disease-modifying therapy and no dedicated animal model; management is entirely supportive and multidisciplinary. Fewer than ~40 individuals have been reported worldwide as of 2026, and the disorder is frequently associated with consanguinity, though compound-heterozygous cases in non-consanguineous families are also documented.

Key Findings

Finding 1 — DEGCAGS is caused by biallelic loss-of-function ZNF699 variants (autosomal recessive)

DEGCAGS syndrome is an autosomal recessive multisystem disorder caused by biallelic, loss-of-function (LoF) variants in ZNF699, a KRAB zinc-finger gene on chromosome 19p13.3. Karimi et al. (2024) collected 30 affected individuals (12 new) and confirmed biallelic LoF ZNF699 as the cause. Reported variant types include frameshift indels (e.g., c.14-17delGAAA, p.Arg5fsTer14; c.975-976delCA, p.His325fsTer8, seen as a compound heterozygous pair), nonsense variants, and homozygous missense changes. The gene was first proposed as a novel disease association in 2021.

"Developmental Delay with Gastrointestinal, Cardiovascular, Genitourinary, and Skeletal Abnormalities syndrome (DEGCAGS, MIM #619488) is caused by biallelic, loss-of-function (LoF) ZNF699 variants" — PMID: 39424669

"We propose six novel gene-disease associations based on 38 patients with variants in the BLOC1S1, IPO8, MMP15, PLK1, RAP1GDS1, and ZNF699 genes." — PMID: 33875846

Finding 2 — A diagnostic DNA-methylation episignature and marked clinical variability

Karimi et al. (2024) performed blood-DNA methylation profiling in 9 individuals and constructed a classifier that distinguishes DEGCAGS from controls, identifying a robust, reproducible episignature. The syndrome shows variable neurodevelopmental disability, discordant organ anomalies among full siblings, age-related presentation, a shared facial gestalt (validated via GestaltMatcher on 53 facial photos from 5 individuals), and infant mortality. Differentially methylated regions (DMRs) implicate downstream genes plausibly involved in pathogenesis.

"We also identified a robust episignature for DEGCAGS syndrome." — PMID: 39424669

"discordant organ anomalies among full siblings and infant mortality" — PMID: 39424669

Finding 3 — A congenital-onset multisystem malformation syndrome

Across case reports, DEGCAGS features include intrauterine growth restriction, prematurity, neonatal hypotension, generalized hypotonia, bradycardia, apnea, facial dysmorphia, skeletal malformations, and gastrointestinal, immune, urinary, respiratory, cardiac, and visual involvement. Craniofacial features span microcephaly or dolichocephaly, coarse facies, synophrys, smooth philtrum, thin upper lip, retromicrognathia, and hair thinning; dental findings include taurodontism, talon cusps, and enamel hypomineralization. Airway involvement includes laryngomalacia, vocal cord dysfunction, and nasopharyngeal/tongue-base hamartomas producing stridor. Hematologic/immune findings include leukopenia, neutropenia, and recurrent pneumonia.

"generalized hypotonia, bradycardia, apnea requiring resuscitation and positive pressure ventilation, facial dysmorphia, skeletal malformations, and disorders of the gastrointestinal, immune, urinary, respiratory, cardiac, and visual systems" — PMID: 38014480

"microcephaly, coarse facial features, oropharyngeal masses, and developmental delay" — PMID: 41205195

"hair thinning, dolichocephaly, retromicrognathia, synophrys, smooth philtrum, thin upper lip" — PMID: 42569837

Finding 4 — Ultra-rare, consanguinity-associated, no targeted therapy

Fewer than ~40 individuals have been reported worldwide as of 2026; the largest series is 30 individuals (Karimi 2024). Inheritance is autosomal recessive: homozygous variants occur in consanguineous families (e.g., Middle Eastern), and compound-heterozygous variants occur in non-consanguineous families (maternal c.14-17delGAAA / paternal c.975-976delCA). No Orphanet prevalence figure is established; the disorder is classified as ultra-rare. Management is entirely supportive and multidisciplinary: airway surgery/supraglottoplasty for hamartomas, respiratory support, nutritional support, developmental/rehabilitative therapy, and dental care. No pharmacologic, gene, or disease-modifying therapy exists.

"We collected data on 30 affected individuals (12 new)." — PMID: 39424669

"An infant born to a consanguineous Middle Eastern family" — PMID: 38014480

"Surgical resection of nasopharyngeal and tongue-base masses with supraglottoplasty was performed." — PMID: 41205195

Finding 5 — ZNF699 mutation spectrum and episignature architecture

ZNF699 (OMIM *609571; HGNC:ZNF699; chr19p13.3) encodes a KRAB-C2H2 zinc-finger protein. The founding cohort (Bertoli-Avella et al. 2021) reported 13 patients from 12 consanguineous, mostly Arab families with 5 homozygous frameshift indels. Karimi et al. (2024) compiled 30 patients (18 from literature + 12 new) carrying 15 distinct variants (~10 frameshift/nonsense, 2 missense, 1 splice-site, 2 in-frame; 7 novel), located in the KRAB domain, the C2H2 zinc-finger domain, or the intervening region. 28/30 patients were homozygous and 2 compound heterozygous (e.g., Biela 2022, Q179X/R443X). The DEGCAGS episignature comprises ~210 DMRs, predominantly hypermethylation, with >50% located in gene promoters and partial overlap with BAFopathy episignatures.

"Analysis of differentially methylated regions suggested an effect on genes potentially implicated in the syndrome's pathogenesi[s]" — PMID: 39424669

Finding 6 — Immune and hematologic dysfunction is a core feature

OMIM #619488 lists anemia or pancytopenia, immunodeficiency with recurrent infections, and sensorineural hearing impairment as common features, with death in childhood. Immunodeficiency/recurrent infections are reported in ~42.3% of patients. Case-level evidence includes leukopenia and neutropenia with recurrent pneumonia (4–5 episodes/year) in an infant (Zhu et al. 2026), and the first detailed immunological work-up (Giardino et al. 2026) documenting severe B-cell depletion in a DEGCAGS patient with a novel biallelic ZNF699 variant. Ali (2024) also noted immune involvement in a neonatal multisystem presentation.

"discordant organ anomalies among full siblings and infant mortality" — PMID: 39424669

Finding 7 — Phenotype frequencies and cohort demographics

The Karimi et al. (2024) cohort comprised 30 individuals from 23 families (20 male, 10 female; ages 1 month–21 years; mean age at diagnosis 4.9 years; Middle Eastern, European, Asian, and Hispanic descent), with 26 individuals having detailed clinical data. Feature frequencies (n=26) are summarized below.

Phenotype	Frequency (n=26)	Percent	Suggested HPO term
Facial dysmorphism	26/26	100%	HP:0001999
Global developmental delay / intellectual disability	25/26	~96%	HP:0001263 / HP:0001249
Skeletal and dental abnormalities	22/26	~85%	HP:0000924 / HP:0000164
Skin/adnexa abnormalities	19/26	~73%	HP:0000951
CNS structural and myelin abnormalities	17/26	~65%	HP:0002011
Gastrointestinal abnormalities	16/26	~62%	HP:0011024
Genitourinary abnormalities	16/26	~62%	HP:0000119
Hypotonia	15/26	~58%	HP:0001252
Immunodeficiency / recurrent infections	~42%	~42%	HP:0002715
Sensorineural hearing loss	Variable	—	HP:0000407
Cardiovascular anomalies	Variable	—	HP:0001627
Premature graying of hair	Variable	—	HP:0002216

Mortality: 3 deaths in the cohort — heart failure from Tetralogy of Fallot (at 6 months), Dengue fever (at 9 months), and sepsis (at 8 years).

"We collected data on 30 affected individuals (12 new)." — PMID: 39424669

Finding 8 — No animal model; complex ZNF699 orthology

ZNF699 is a KRAB-C2H2 zinc-finger transcription factor that acts in the nucleus and is predicted to regulate RNA polymerase II transcription. No knockout mouse, zebrafish, or other engineered DEGCAGS model has been reported; functional validation to date is limited to human patient DNA-methylation profiling. Historically, ZNF699 was proposed as a human ortholog of the Drosophila alcohol-tolerance gene hangover (hang), but with low amino-acid identity (18–26%) and similarity (30–41%), and mammalian orthology of hang is complex. ZNF699 mRNA was shown to be reduced in the dorsolateral prefrontal cortex of carriers of an alcohol-dependence-associated haplotype.

"a number of human gene products (including ZNF699) with similar levels of amino-acid identity (18-26%) and similarity (30-41%), are consistently identified as the best matches with the translated hang sequence" — PMID: 16940975

"expression of ZNF699 mRNA is significantly reduced in the dorsolateral prefrontal cortex" — PMID: 16940975

Finding 9 — Protein architecture, structural disruption, episignature-based diagnosis correction, and a hematologic mechanistic link

Giardino et al. (2026) reported a novel homozygous KRAB-domain missense variant c.153C>A (p.Asn51Lys); AlphaFold2 modeling showed disruption of a hydrogen bond between residues 51 and 24 and defined the ZNF699 domain architecture as a KRAB domain plus 16 C2H2 zinc fingers, causing syndromic combined immunodeficiency with severe B-cell depletion. Critically, the DEGCAGS episignature reclassified this case away from an incorrect ADNP/Helsmoortel–Van der Aa (HVDAS) diagnosis (a de novo ADNP VUS c.817C>T), yielding a high-confidence methylation-variant-pathogenicity score (0.891) and remaining robust despite marked lymphopenia. Hematologically (Bradley et al. 2025), DEGCAGS enters the differential for inherited bone marrow failure / Diamond–Blackfan anemia; anemia was reported in 8/14 early patients, with a proposed mechanistic link via a ZNF699–RNA-polymerase-II interaction and RNA Pol II's role in ribosome biogenesis, analogous to the bone-marrow-failure gene MYSM1.

"which can be used as a screening, diagnostic and classification tool for ZNF699 variants" — PMID: 39424669

Section-by-Section Report

1. Disease Information

Overview. DEGCAGS syndrome is a congenital-onset, autosomal-recessive multisystem malformation and neurodevelopmental disorder. The acronym stands for Developmental delay with Gastrointestinal, Cardiovascular, Genitourinary, And Skeletal abnormalities. It is characterized by near-universal facial dysmorphism and developmental delay, plus a highly variable constellation of organ malformations, growth failure, hypotonia, and hematologic/immune involvement, with significant early-childhood mortality.

Key identifiers: - OMIM: #619488 (phenotype); gene ZNF699 609571 - MONDO: MONDO:0859181 - Gene / HGNC: ZNF699 - Orphanet / ICD-10 / ICD-11 / MeSH: No dedicated Orphanet prevalence entry or specific ICD code identified; the disorder is ultra-rare and recently described (2021 onward). (Not available / not established.)*

Synonyms / alternative names: "Developmental delay with gastrointestinal, cardiovascular, genitourinary, and skeletal abnormalities"; ZNF699-related syndrome; DEGCAGS.

Information source type: Primarily aggregated disease-level and cohort resources (OMIM, one large multi-center cohort, and individual case reports) rather than EHR-derived population data. The disorder is defined from ~30–40 individually reported patients.

2. Etiology

Causal factor: Genetic — biallelic loss-of-function variants in ZNF699 (Finding 1). The disorder is monogenic and Mendelian; there is no evidence for environmental or infectious causation.

Genetic risk factors: The only established genetic cause is biallelic ZNF699 LoF. Consanguinity is a major risk factor, producing homozygous frameshift/nonsense variants (founding Arab cohort; Finding 5). No modifier loci or susceptibility variants have been defined, though the marked intrafamilial variability (discordant siblings) implies unidentified modifiers, stochastic, or epigenetic contributions.

Environmental / lifestyle / protective factors: None identified. As a fully penetrant recessive malformation syndrome, environmental and protective factors and gene–environment interactions are not applicable / not available.

3. Phenotypes

DEGCAGS phenotypes span dysmorphology, neurodevelopment, and multiple organ systems (Findings 3, 7). Onset is congenital/neonatal; developmental delay persists into childhood. Severity is variable, ranging from survivable multisystem involvement to lethal in infancy. See the frequency table under Finding 7 for quantified frequencies and suggested HPO terms.

Craniofacial (100%): coarse facies, synophrys (HP:0000664), smooth philtrum (HP:0000319), thin upper lip (HP:0000219), retromicrognathia (HP:0000278), microcephaly (HP:0000252) or dolichocephaly (HP:0000268), hair thinning.
Neurodevelopmental (~96%): global developmental delay (HP:0001263), intellectual disability (HP:0001249), hypotonia (HP:0001252, ~58%), CNS structural/myelin abnormalities (~65%).
Dental (part of ~85% skeletal/dental): taurodontism (HP:0000679), talon cusps, enamel hypomineralization (HP:0006297).
Airway/respiratory: laryngomalacia (HP:0001601), vocal cord dysfunction, nasopharyngeal/tongue-base hamartomas causing stridor (HP:0031416).
Gastrointestinal (~62%), genitourinary (~62%), cardiovascular (variable, incl. Tetralogy of Fallot HP:0001636), skin/adnexa (~73%), sensorineural hearing loss (HP:0000407), ocular abnormalities, and hematologic/immune involvement (~42% immunodeficiency).

Quality-of-life impact: Substantial — developmental delay, recurrent infections (4–5 pneumonias/year in some infants), feeding/airway difficulty, and multi-organ malformation impose high caregiving burden and early mortality. Formal QoL instrument data (EQ-5D, SF-36, PROMIS) are not available for this ultra-rare disorder.

4. Genetic / Molecular Information

Causal gene: ZNF699 (OMIM 609571; chr19p13.3), a KRAB-C2H2 zinc-finger transcription factor with a KRAB domain plus 16 C2H2 zinc fingers* (Finding 9).

Pathogenic variant spectrum (Finding 5): 15 distinct variants across 30 patients — ~10 frameshift/nonsense, 2 missense, 1 splice-site, 2 in-frame; 7 novel; distributed across the KRAB domain, the C2H2 zinc-finger array, and the intervening region. Representative variants:

Variant (cDNA)	Protein	Type	Zygosity context
c.14-17delGAAA	p.Arg5fsTer14	Frameshift	Compound het (maternal)
c.975-976delCA	p.His325fsTer8	Frameshift	Compound het (paternal)
—	p.Gln179Ter (Q179X)	Nonsense	Compound het (Biela 2022)
—	p.Arg443Ter (R443X)	Nonsense	Compound het (Biela 2022)
c.153C>A	p.Asn51Lys	Missense (KRAB)	Homozygous (Giardino 2026)

Variant classification: Truncating variants are classified pathogenic/likely pathogenic (LoF is the established mechanism). The p.Asn51Lys missense was supported as pathogenic by a high episignature methylation-variant-pathogenicity score (0.891) plus AlphaFold2-predicted H-bond disruption (residues 51–24).

Allele frequency: Variants are private/ultra-rare; no common population allele frequency. Origin: germline. Functional consequence: loss of function.

Modifier genes: None identified (intrafamilial variability implies unknown modifiers).

Epigenetic information: DEGCAGS carries a diagnostic DNA-methylation episignature of ~210 DMRs, predominantly hypermethylation, >50% in gene promoters, partially overlapping BAFopathy signatures (Findings 2, 5, 9). This is both a diagnostic tool and a mechanistic clue.

Chromosomal abnormalities: None reported; the disorder is caused by point/indel variants, not large structural changes.

5. Environmental Information

No environmental, lifestyle, toxic, or infectious contributing factors are established. DEGCAGS is a monogenic recessive disorder. Infections (e.g., recurrent pneumonia, sepsis, Dengue) act as downstream complications of the intrinsic immunodeficiency rather than causal triggers.

6. Mechanism / Pathophysiology

Ordered causal chain (initiating lesion → clinical manifestation):

Biallelic LoF variants in ZNF699 (frameshift/nonsense/splice/missense) → loss of functional ZNF699 KRAB-C2H2 zinc-finger transcription factor. (Demonstrated: genetics.)
Loss of ZNF699 → loss of KRAB-ZFP/KAP1(TRIM28)-directed heterochromatin repression at target loci (H3K9me3 deposition and DNA methylation). (Inferred from general KRAB-ZFP biology; not yet directly demonstrated for ZNF699.)
Loss of targeted repression → dysregulated DNA methylation genome-wide, manifesting as the reproducible promoter-predominant hypermethylation episignature (~210 DMRs). (Demonstrated: patient methylation profiling.)
Aberrant methylation/expression of downstream target genes → dysregulated developmental gene-expression programs during embryogenesis. (Inferred; DMRs implicate candidate downstream genes.)
Branch A — Morphogenesis: dysregulated developmental programs → multi-organ malformation (craniofacial, skeletal, GI, GU, cardiovascular, CNS). (Inferred.)
Branch B — Hematopoiesis/immunity: proposed ZNF699–RNA-Pol-II interaction and Pol-II role in ribosome biogenesis → impaired hematopoiesis → anemia/pancytopenia and B-cell depletion/immunodeficiency (analogous to MYSM1-related bone-marrow failure). (Inferred/hypothesized.)
Branch C — Neurodevelopment: dysregulated CNS gene programs → developmental delay, intellectual disability, hypotonia, white-matter/structural anomalies. (Inferred.)
Convergent multisystem burden + immunodeficiency → recurrent infection, cardiac failure, growth failure → infant/childhood mortality. (Demonstrated at cohort level.)

Supporting detail: - Molecular pathway (upstream): KRAB-ZFP → KAP1/TRIM28 → SETDB1 (H3K9me3) / NuRD / DNMT heterochromatin machinery; regulation of RNA polymerase II transcription (GO:0006357). Structural work on the KRAB–KAP1 interface (PMID: 36341546) validates this repression axis for other KRAB-ZFPs. - Cellular processes: transcriptional/epigenetic dysregulation during development; possible ribosome-biogenesis defect in hematopoietic precursors. - Protein dysfunction: LoF (truncation) or structural destabilization (KRAB-domain missense disrupting H-bonding) → impaired DNA-binding/repressor function. - Suggested GO terms: GO:0006355 (regulation of DNA-templated transcription), GO:0000122 (negative regulation of transcription by RNA Pol II), GO:0006325 (chromatin organization), GO:0006306 (DNA methylation), GO:0140718 (heterochromatin formation). - Suggested CL terms: CL:0000236 (B cell), CL:0000037 (hematopoietic stem cell), CL:0000048 (multipotent progenitor), CL:0000540 (neuron).

7. Anatomical Structures Affected

Organ/system level: craniofacial skeleton, brain/CNS (UBERON:0000955), heart (UBERON:0000948), gastrointestinal tract (UBERON:0001555), genitourinary system (UBERON:0000990), skeletal system (UBERON:0001434), teeth (UBERON:0001091), skin/adnexa (UBERON:0002097), hematopoietic/immune system (UBERON:0002390), ear/cochlea (sensorineural hearing loss), and eye.
Airway: larynx (UBERON:0001737), nasopharynx, tongue base — sites of hamartomatous masses.
Tissue/cell level: epithelial, connective, muscle, and nervous tissues; hematopoietic lineages (esp. B cells and erythroid precursors).
Subcellular level: nucleus (GO:0005634) — site of ZNF699 transcription-factor activity; chromatin/heterochromatin.
Lateralization: malformations are generally bilateral/systemic; craniofacial features are symmetric.

8. Temporal Development

Onset: congenital/neonatal; often with IUGR and prematurity. Onset pattern is chronic/congenital, not acute.
Progression: developmental delay persists into childhood; the malformation burden is static (structural), while complications (infections, feeding/airway problems, cardiac failure) are the dynamic drivers of morbidity/mortality.
Disease course: chronic/lifelong for survivors; a subset dies in infancy or early childhood.
Critical periods: embryonic organogenesis (malformation window) and infancy (infection/airway vulnerability window — the key window for supportive intervention).

9. Inheritance and Population

Inheritance: autosomal recessive; 28/30 patients homozygous, 2 compound heterozygous (Finding 5).
Penetrance/expressivity: apparently high penetrance but highly variable expressivity, including discordant full siblings.
Consanguinity/founder effects: strong association with consanguinity; the founding cohort was predominantly Arab consanguineous families. No formal founder haplotype quantified.
Epidemiology: ultra-rare; <~40 individuals reported worldwide as of 2026; no established prevalence/incidence figures.
Demographics: reported across Middle Eastern, European, Asian, and Hispanic populations. In the Karimi cohort: 20 male / 10 female (apparent male excess, likely ascertainment); ages 1 month–21 years; mean age at diagnosis 4.9 years.
Genetic anticipation / mosaicism / carrier frequency: not applicable / not established.

10. Diagnostics

Genetic testing (primary): whole-exome or whole-genome sequencing identifying biallelic ZNF699 variants is the diagnostic gold standard. Single-gene/panel testing is applicable once suspected.
Episignature testing: the DEGCAGS DNA-methylation episignature is a validated screening, diagnostic, and variant-classification tool — able to reclassify VUS and correct misdiagnoses (e.g., away from ADNP/HVDAS), robust even under lymphopenia (Finding 9).
Supporting laboratory tests: CBC (anemia, leukopenia, neutropenia, pancytopenia); immunologic work-up (B-cell depletion, immunoglobulin/lymphocyte subsets).
Imaging: brain MRI (structural/myelin anomalies); echocardiography (congenital heart disease); airway endoscopy (laryngomalacia, hamartomas); skeletal survey.
Differential diagnosis: BAFopathies (Coffin–Siris; episignature overlap), ADNP/Helsmoortel–Van der Aa syndrome, and inherited bone-marrow-failure syndromes / Diamond–Blackfan anemia (hematologic overlap). The episignature and ZNF699 genotype distinguish DEGCAGS.
Screening: carrier screening and cascade testing are appropriate in consanguineous families; no newborn screening exists.

11. Outcome / Prognosis

Mortality: significant infant/childhood mortality. In the Karimi cohort, 3 deaths — Tetralogy-of-Fallot heart failure (6 mo), Dengue (9 mo), and sepsis (8 yr).
Morbidity: high — developmental delay/intellectual disability, recurrent infections, feeding/airway compromise, and multi-organ malformation.
Prognostic factors: severity of cardiac malformation, degree of immunodeficiency, and airway involvement appear to drive outcome. No validated prognostic biomarkers.
Recovery: malformations are structural and non-remitting; developmental deficits persist. Formal survival statistics are unavailable given the small cohort.

12. Treatment

No targeted, pharmacologic, gene, or disease-modifying therapy exists. Management is supportive and multidisciplinary (Finding 4): - Airway/ENT: surgical resection of nasopharyngeal/tongue-base hamartomas with supraglottoplasty; airway monitoring. - Respiratory: infection management, ventilatory support as needed. - Immunologic/hematologic: infection prophylaxis/treatment; transfusion support for cytopenias where indicated. - Nutritional/GI: feeding support. - Developmental/rehabilitative: physical, occupational, and speech therapy. - Dental: management of taurodontism, enamel defects. - Cardiac: correction/management of congenital heart disease.

Suggested NCIT categories: supportive care (NCIT:C15277), surgical intervention (NCIT:C15329), rehabilitation therapy. No experimental trials (NCT identifiers) are registered for DEGCAGS.

13. Prevention

Genetic counseling: the mainstay — recurrence risk 25% for future pregnancies of carrier couples; especially relevant in consanguineous families.
Reproductive options: carrier screening, prenatal diagnosis, and preimplantation genetic testing once the familial variants are known.
Secondary/tertiary prevention: early identification and management of infections, airway compromise, and cardiac disease to prevent complications.
Primary population-level prevention, immunization-specific strategies, and public-health/environmental interventions are not applicable.

14. Other Species / Natural Disease

Orthology: ZNF699 was historically proposed as a human ortholog of the Drosophila hangover (hang) gene, but with weak sequence identity (18–26%) and complex mammalian orthology (Finding 8).
Natural disease in other species: none reported (no OMIA entry identified).
Comparative/veterinary relevance: not established. (Not applicable / not available.)
Zoonotic potential: not applicable (non-infectious genetic disorder).

15. Model Organisms

No dedicated DEGCAGS animal or cellular disease model has been reported (Finding 8). No knockout mouse, zebrafish, Drosophila, or organoid/iPSC model exists to date. Functional validation is currently limited to human patient DNA-methylation profiling and AlphaFold2-based structural modeling of variants. This is a major gap: without a model system, the causal chain from ZNF699 loss to multisystem malformation and immunodeficiency remains largely inferred.

Mechanistic Model / Interpretation

   Biallelic LoF ZNF699 variants (frameshift / nonsense / splice / KRAB-missense)
                   │
                   ▼
Loss of ZNF699 KRAB-C2H2 zinc-finger transcription factor
                   │  (KRAB → KAP1/TRIM28 → SETDB1/DNMT)  [inferred]
                   ▼
     Loss of targeted heterochromatin repression (H3K9me3 + DNA methylation)
                   │
                   ▼
     Dysregulated DNA methylation  →  promoter-predominant HYPERmethylation
      episignature (~210 DMRs)  [DEMONSTRATED, diagnostic]
                   │
                   ▼
Aberrant expression of downstream developmental target genes
┌──────────────────────┬───────────────────────┬─────────────────────┐
▼                      ▼                       ▼                     ▼
  Morphogenesis          Hematopoiesis/          Neurodevelopment       Craniofacial/
  (heart, GI, GU,        immunity                (DD/ID, hypotonia,     dental/skin
  skeleton)              (anemia, B-cell         white-matter)          patterning
         depletion; ?RNA-Pol-II/
         ribosome biogenesis link)
└──────────────────────┴───────────────────────┴─────────────────────┘
                   │
                   ▼
Multisystem malformation + immunodeficiency + growth failure
                   │
                   ▼
Recurrent infection / cardiac failure → infant/childhood mortality

The unifying interpretation is that ZNF699 is a KRAB-zinc-finger transcriptional repressor whose loss deregulates the epigenetic control of downstream developmental genes, producing a broad, variable malformation-plus-neurodevelopmental phenotype. The promoter-hypermethylation episignature is both the strongest experimental evidence for an epigenetic-regulatory mechanism and the most clinically useful diagnostic. The BAFopathy episignature overlap situates DEGCAGS among chromatin/transcription-regulatory ("epigenetic machinery") disorders. The hematologic/immune branch — anemia/pancytopenia and B-cell depletion — is a distinctive, under-explained feature, with a proposed but unproven link to RNA-Pol-II function and ribosome biogenesis (by analogy to MYSM1).

Evidence Base

PMID	Title (abbrev.)	Role	Support
39424669	Epigenomic and phenotypic characterization of DEGCAGS syndrome	Landmark cohort (n=30)	Causal gene, episignature, frequencies, mortality (F1, F2, F5, F7, F9)
33875846	Combining exome/genome sequencing… novel gene-disease associations	Founding association	First proposal of ZNF699/DEGCAGS (F1, F5)
38014480	Clinical and ocular abnormalities in DEGCAGS	Case report	Multisystem spectrum, consanguinity (F3, F4)
41205195	Novel Airway Challenges…Infant Laryngeal Hamartomas	Case report	Airway hamartomas, surgical management (F3, F4)
42569837	Expanding the Phenotypic Spectrum…Craniofacial/Oral	Case report	Craniofacial gestalt, dental findings (F3)
42527142	Case of DEGCAGS caused by ZNF699 variation (Zhu 2026)	Case report	Compound-het variants, leukopenia/neutropenia, recurrent pneumonia (F1, F4, F6)
42534679	A novel… (Giardino 2026)	Case report + immunology	KRAB missense, B-cell depletion, AlphaFold2, episignature reclassification (F6, F9)
16940975	Alcohol dependence…ZNF699…Drosophila hangover	Functional/orthology	Weak hang orthology, brain expression (F8)
36341546	Structure and functional mapping of the KRAB-KAP1 repressor complex	Mechanistic (other KRAB-ZFP)	Validates KRAB→KAP1→H3K9me3 repression axis (mechanism)
35205213	Further Delineation of DEGCAGS…ZNF699	Phenotype delineation	Supports phenotype spectrum

Additional KRAB-ZFP/KAP1 mechanistic papers (PMID: 30846446, PMID: 29482634, PMID: 22496453, PMID: 21876767, PMID: 21791101) provide the general biological framework for how KRAB-ZFP/KAP1 loss deregulates DNA methylation and heterochromatin — the inferred mechanism for the DEGCAGS episignature — but do not directly study ZNF699.

Limitations and Knowledge Gaps

Small evidence base: all conclusions rest on <~40 reported patients, one large cohort, and scattered case reports. Frequency estimates and demographics are subject to ascertainment bias (e.g., apparent male excess).
Mechanism is largely inferred: the KRAB-ZFP/KAP1 → H3K9me3 repression step and the RNA-Pol-II/ribosome-biogenesis hematologic link are hypotheses extrapolated from other KRAB-ZFPs and analogous genes, not directly demonstrated for ZNF699. The direct DNA-binding targets of ZNF699 are unknown.
No animal/cellular model: precludes causal validation, target-gene identification, and therapeutic testing.
Unexplained variability: the discordance between full siblings is unexplained — modifier genes, stochastic epigenetic effects, or environmental factors remain uncharacterized.
Missing standard resources: no Orphanet prevalence, ICD code, QoL data, natural-history study, or registry exists.

Proposed Follow-up Experiments / Actions

Identify ZNF699 direct targets: perform CUT&RUN/ChIP-seq for ZNF699 (and KAP1) in relevant human cell types (neural progenitors, hematopoietic precursors) to map binding sites and connect them to the promoter-hypermethylated DMRs.
Test the KAP1 dependency: co-IP / structure-guided mutagenesis to confirm that ZNF699 recruits KAP1 via its KRAB domain, and that the p.Asn51Lys missense abolishes repression (functional silencing assay, as done for ZNF93 in PMID 36341546).
Generate a model system: create Znf699 knockout mice and/or patient iPSC-derived organoids and hematopoietic differentiation cultures to test phenotype recapitulation, especially the B-cell/erythroid defect.
Interrogate the hematologic mechanism: test the proposed ZNF699–RNA-Pol-II interaction and ribosome-biogenesis hypothesis (polysome profiling, nascent-transcription assays) in patient/model hematopoietic cells; compare to MYSM1-deficient models.
Build a natural-history registry: aggregate reported and new patients to quantify penetrance, survival, genotype–phenotype correlations, and modifier candidates; formally establish prevalence and ontology mappings (Orphanet, ICD-11).
Deploy the episignature clinically: promote routine methylation-episignature testing to resolve ZNF699 VUS and correct misdiagnoses, and to detect additional cases in existing methylation-array datasets.

Report compiled from 9 confirmed findings and 18 reviewed papers across 5 investigation iterations. Evidence types: predominantly human clinical (cohort + case reports), with in-silico structural modeling (AlphaFold2) and extrapolated in-vitro/model-organism mechanistic context from the broader KRAB-ZFP/KAP1 literature.

Artifacts

Reference Validation

Checked with linkml-reference-validator 0.2.1.

Outcome	Count
References checked	15
Resolved	15
Unresolved (possible confabulation)	0
Unverifiable	0
References weighed for topical relevance	15
On topic	7
Off topic	3

References that may not be about this subject

These identifiers resolve, so they are not fabrications, but the records they resolve to share almost none of this report's vocabulary. That is a clue and not a verdict - a paper can be relevant in ways its title and abstract do not spell out - so read them before deciding:

PMID:30846446 (3 mentions) - The KRAB-zinc-finger protein ZFP708 mediates epigenetic repression at RMER19B retrotransposons.
shared terms: gene
PMID:29482634 (3 mentions) - Individual retrotransposon integrants are differentially controlled by KZFP/KAP1-dependent histone methylation, DNA methylation and TET-mediated hydroxymethylation in naïve embryonic stem cells.
shared terms: gene
PMID:21791101 (3 mentions) - A gene-rich, transcriptionally active environment and the pre-deposition of repressive marks are predictive of susceptibility to KRAB/KAP1-mediated silencing.
shared terms: gene

Weighed against this report's own most characteristic terms: znf699, degcag, gene, variant, developmental, patient, cohort, airway, disorder, episignature, hematologic, malformation, syndrome, delay, infection, disease, structural, skeletal, loss, mortality.

All extracted references resolved successfully. Resolving is not the same as being relevant, though - see the references listed above as possibly off topic.

Term Validation

Checked with linkml-term-validator 0.4.5, through the ols: adapter.

Outcome	Count
Terms checked	49
Resolved	47
Unresolved (possible confabulation)	0
Obsolete	1
Unverifiable	1
Terms whose name was checked	13
Terms named correctly	5
Terms named as a different term	1
Terms whose name is worth a second look	7

Terms the report names something else

These identifiers resolve, so nothing about them looks wrong, and the ontology calls them something unrelated to what the report calls them. That usually means the identifier is not the one the sentence needs:

UBERON:0000955 (1 mention) - the report calls it "Organ/system level: craniofacial skeleton, brain/CNS"; UBERON calls it brain**

Obsolete terms

These terms are real but deprecated. Citing one is not a fabrication; it does mean the report is naming something the ontology has retired:

GO:0006306 (obsolete DNA methylation) (1 mention)

Terms whose name is worth a second look

The report's name for these is recognisably related to the term's own name without being one of them. A loose paraphrase reads the same way as a citation of the wrong sibling term - and so does a related synonym, which the ontology records precisely because it names something adjacent rather than the same thing - so these are listed rather than judged:

HP:0001601 (1 mention) - the report calls it "Airway/respiratory: laryngomalacia"; HP calls it Laryngomalacia**
GO:0000122 (1 mention) - the report calls it "negative regulation of transcription by RNA Pol II"; GO calls it negative regulation of transcription by RNA polymerase II
GO:0006306 (1 mention) - the report calls it "DNA methylation"; GO calls it obsolete DNA methylation
GO:0140718 (1 mention) - the report calls it "heterochromatin formation"; GO calls it facultative heterochromatin formation
CL:0000048 (1 mention) - the report calls it "multipotent progenitor"; CL calls it multi fate stem cell, and lists "multipotent cell" among its other names
UBERON:0001737 (1 mention) - the report calls it "Airway: larynx"; UBERON calls it larynx**
GO:0005634 (1 mention) - the report calls it "Subcellular level: nucleus"; GO calls it nucleus**, and lists "cell nucleus" among its other names

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DEGCAGS Syndrome: A Comprehensive Disease Characteristics Report

Summary

Key Findings

Finding 1 — DEGCAGS is caused by biallelic loss-of-function ZNF699 variants (autosomal recessive)

Finding 2 — A diagnostic DNA-methylation episignature and marked clinical variability

Finding 3 — A congenital-onset multisystem malformation syndrome

Finding 4 — Ultra-rare, consanguinity-associated, no targeted therapy

Finding 5 — ZNF699 mutation spectrum and episignature architecture

Finding 6 — Immune and hematologic dysfunction is a core feature

Finding 7 — Phenotype frequencies and cohort demographics

Finding 8 — No animal model; complex ZNF699 orthology

Finding 9 — Protein architecture, structural disruption, episignature-based diagnosis correction, and a hematologic mechanistic link

Section-by-Section Report

1. Disease Information

2. Etiology

3. Phenotypes

4. Genetic / Molecular Information

5. Environmental Information

6. Mechanism / Pathophysiology

7. Anatomical Structures Affected

8. Temporal Development

9. Inheritance and Population

10. Diagnostics

11. Outcome / Prognosis

12. Treatment

13. Prevention

14. Other Species / Natural Disease

15. Model Organisms

Mechanistic Model / Interpretation

Evidence Base

Limitations and Knowledge Gaps

Proposed Follow-up Experiments / Actions

Artifacts

Reference Validation

References that may not be about this subject

Term Validation

Terms the report names something else

Obsolete terms

Terms whose name is worth a second look