Orofaciodigital syndrome type I (OFD1) is an X-linked dominant ciliopathy caused by mutations in the OFD1 gene (also known as CXORF5). It is characterized by malformations of the oral cavity (lobulated tongue, oral frenula, cleft palate), face (facial asymmetry, hypertelorism), and digits (brachydactyly, syndactyly, polydactyly). CNS malformations including agenesis of the corpus callosum and polycystic kidneys are common. The condition is typically lethal in males.
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name: Orofaciodigital Syndrome Type I
creation_date: '2026-02-13T00:31:42Z'
updated_date: '2026-02-17T21:53:14Z'
category: Mendelian
description: >
Orofaciodigital syndrome type I (OFD1) is an X-linked dominant ciliopathy caused
by mutations in the OFD1 gene (also known as CXORF5). It is characterized by
malformations of the oral cavity (lobulated tongue, oral frenula, cleft palate),
face (facial asymmetry, hypertelorism), and digits (brachydactyly, syndactyly,
polydactyly). CNS malformations including agenesis of the corpus callosum and
polycystic kidneys are common. The condition is typically lethal in males.
disease_term:
preferred_term: Orofaciodigital syndrome I
term:
id: MONDO:0010702
label: orofaciodigital syndrome I
parents:
- Ciliopathies
inheritance:
- name: X-linked Dominant
description: >
X-linked dominant inheritance, usually lethal in hemizygous males during
gestation, therefore predominantly affecting females. Approximately 75% of
affected females have a de novo pathogenic variant (simplex cases); the
remaining 25% have an affected mother. Rare viable affected males with
mosaic or hypomorphic variants have been reported.
evidence:
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
Oral-facial-digital syndrome type 1 (OFD1) is characterised by an X linked
dominant mode of inheritance with lethality in males
explanation: "Confirms X-linked dominant inheritance with male lethality."
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Approximately 75% of affected females represent simplex cases (i.e., the
occurrence of OFD1 in a single family member) and have a de novo pathogenic
variant; approximately 25% of females diagnosed with OFD1 have an affected
mother
explanation: >-
GeneReviews establishes that ~75% of OFD1 cases are de novo, with 25%
maternally inherited, informing recurrence risk counseling.
prevalence:
- population: Published clinical estimates
measure_type: POINT_PREVALENCE
prevalence_class: BAND_1_9_PER_100000
rate_low: 0.4
rate_high: 2.0
percentage: 1 in 50,000 to 1 in 250,000
notes: >-
Recent clinical literature describes OFD1 as a rare X-linked dominant
ciliopathy with broad estimated prevalence, likely reflecting underdiagnosis
and phenotypic heterogeneity.
evidence:
- reference: PMID:41064626
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "OFD 1 manifests with skeletal, CNS, and renal abnormalities with prevalence estimated between 1 in 50,000 and 1 in 250,000."
explanation: Recent clinical case report and review provides an explicit published prevalence range for OFD1.
pathophysiology:
- name: Primary Cilia Dysfunction
conforms_to: "ciliopathy_dysfunction#Basal Body and Transition Zone Dysfunction"
description: >
OFD1 encodes a centrosomal and basal body protein required for
primary cilium formation. OFD1 is involved in centriole distal
appendage assembly and ciliogenesis. Loss of function disrupts
Hedgehog and WNT signaling pathways dependent on primary cilia,
leading to defects in craniofacial, limb, brain, and kidney
development.
biological_processes:
- preferred_term: Cilium Assembly
term:
id: GO:0060271
label: cilium assembly
- preferred_term: Hedgehog Signaling
term:
id: GO:0007224
label: smoothened signaling pathway
cellular_components:
- preferred_term: Primary Cilium
term:
id: GO:0005929
label: cilium
cell_types:
- preferred_term: Epithelial Cell
term:
id: CL:0000066
label: epithelial cell
evidence:
- reference: PMID:19876934
reference_title: "The molecular basis of oral-facial-digital syndrome, type 1."
supports: SUPPORT
snippet: >-
OFD1 gene that encodes a centrosomal protein localized at the basal bodies
at the origin of primary cilia
explanation: "Identifies OFD1 as a centrosomal/basal body protein required for primary cilia."
- reference: PMID:19876934
reference_title: "The molecular basis of oral-facial-digital syndrome, type 1."
supports: SUPPORT
snippet: >-
Ofd1 inactivation is associated to defective sonic hedgehog (Shh) and
canonical Wnt signaling pathways
explanation: "Demonstrates that OFD1 loss disrupts both Hedgehog and Wnt signaling, explaining pleiotropic developmental defects."
- reference: PMID:19876934
reference_title: "The molecular basis of oral-facial-digital syndrome, type 1."
supports: SUPPORT
snippet: >-
OFD1 has a crucial role in the biology of primary cilia thus ascribing this
pleiotropic disease to the growing number of disorders associated to dysfunction
of primary cilia
explanation: "Confirms OFD1 as a ciliopathy."
downstream:
- target: Lobulated Tongue
- target: Accessory Oral Frenula
- target: Median Cleft Upper Lip
- target: Polydactyly
- target: Agenesis of Corpus Callosum
- target: Intellectual Disability
- target: Tongue Nodules
- target: Cleft Palate
- target: Hypodontia
- target: Hypertelorism
- target: Underdeveloped Nasal Alae
- target: Micrognathia
- target: Brachydactyly
- target: Syndactyly
- target: Clinodactyly
- target: Duplicated Great Toe
- target: Dandy-Walker Malformation
- target: Ventriculomegaly
- target: Cerebellar Vermis Hypoplasia
- target: Autistic Behavior
- name: Renal Cystogenesis
conforms_to: "ciliopathy_dysfunction#Renal Tubular Cystic and Fibrotic Disease"
description: >
Disruption of primary cilia function in renal tubular epithelium
leads to polycystic kidney disease, similar to other ciliopathies.
Renal involvement is progressive and may lead to renal failure.
biological_processes:
- preferred_term: Kidney Development
term:
id: GO:0001822
label: kidney development
locations:
- preferred_term: Kidney
term:
id: UBERON:0002113
label: kidney
evidence:
- reference: PMID:9482645
reference_title: "Central nervous system malformations and early end-stage renal disease in oro-facio-digital syndrome type I: a review."
supports: SUPPORT
snippet: >-
cystic medullary disease was noted in OFD 1 carriers, leading 1 patient to
dialysis by age 35 years and the other to severe renal insufficiency by age
28
years
explanation: "Documents progressive renal cystic disease in OFD1 carriers leading to renal failure."
- reference: PMID:19876934
reference_title: "The molecular basis of oral-facial-digital syndrome, type 1."
supports: SUPPORT
snippet: >-
OFD1 shares phenotypic similarities with this latter group of disorders, such
as cystic kidneys, skeletal, and CNS abnormalities
explanation: "Confirms cystic kidneys as a shared ciliopathy feature in OFD1."
downstream:
- target: Polycystic Kidneys
phenotypes:
- name: Lobulated Tongue
description: >
Lobulated or multilobed tongue with hamartomas is a characteristic
oral finding.
phenotype_term:
preferred_term: Lobulated tongue
term:
id: HP:0000180
label: Lobulated tongue
evidence:
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
lingual hamartomas were significantly more frequent in the group with OFD1
mutation
explanation: "Lingual hamartomas (contributing to lobulated tongue) are significantly associated with confirmed OFD1 mutations."
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
oral features are the most reliable diagnostic criteria
explanation: "Oral features including lobulated tongue are the most diagnostically reliable findings."
- name: Accessory Oral Frenula
description: >
Multiple accessory oral frenula (bands of tissue between lips,
gums, and tongue) are a hallmark oral feature.
phenotype_term:
preferred_term: Accessory oral frenulum
term:
id: HP:0000191
label: Accessory oral frenulum
evidence:
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
oral features are the most reliable diagnostic criteria
explanation: "Accessory oral frenula are among the most reliable diagnostic features of OFD1."
- name: Median Cleft Upper Lip
description: >
Median (midline) cleft of the upper lip, distinct from the more
common lateral cleft lip.
phenotype_term:
preferred_term: Median cleft upper lip
term:
id: HP:0000161
label: Median cleft upper lip
evidence:
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
facial dysmorphism with oral, tooth, and distal abnormalities
explanation: "Facial and oral abnormalities including cleft lip are characteristic features."
- name: Polydactyly
description: >
Digital anomalies including brachydactyly, clinodactyly, syndactyly,
and polydactyly affecting hands and/or feet.
phenotype_term:
preferred_term: Polydactyly
term:
id: HP:0010442
label: Polydactyly
evidence:
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
facial dysmorphism with oral, tooth, and distal abnormalities
explanation: "Distal (digit) abnormalities are part of the OFD1 phenotype."
- reference: PMID:19876934
reference_title: "The molecular basis of oral-facial-digital syndrome, type 1."
supports: SUPPORT
snippet: >-
OFD1 is characterized by malformation of the oral cavity, face, and digits
explanation: "Digit malformations are a cardinal feature of OFD1."
- name: Polycystic Kidneys
description: >
Polycystic kidney disease develops in a significant proportion of
patients, potentially leading to renal failure.
phenotype_term:
preferred_term: Renal cyst
term:
id: HP:0000107
label: Renal cyst
evidence:
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
polycystic kidney disease, and central nervous system malformations
explanation: "Polycystic kidney disease is a recognized feature of OFD1."
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
polycystic kidneys and short stature were significantly more frequent in the
group with no OFD1 mutation
explanation: "Interestingly, polycystic kidneys were more common in clinically diagnosed OFD without confirmed OFD1 mutations, suggesting genetic heterogeneity."
- reference: PMID:9482645
reference_title: "Central nervous system malformations and early end-stage renal disease in oro-facio-digital syndrome type I: a review."
supports: SUPPORT
snippet: >-
renal cystic disease is an often overlooked complication specific to OFD 1
explanation: "Highlights renal cystic disease as an underappreciated but specific complication of OFD1."
- name: Agenesis of Corpus Callosum
description: >
Agenesis or dysgenesis of the corpus callosum is a common CNS
malformation.
phenotype_term:
preferred_term: Agenesis of corpus callosum
term:
id: HP:0001274
label: Agenesis of corpus callosum
evidence:
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
complete agenesis of the corpus callosum, large single or multiple
interhemispheric cysts, striking cortical infolding of gyri, ventriculomegaly,
mild molar tooth malformation and moderate to severe cerebellar vermis
hypoplasia
explanation: "Detailed brain MRI evaluation showing corpus callosum agenesis as part of the complete brain phenotype in OFD1."
- reference: PMID:9482645
reference_title: "Central nervous system malformations and early end-stage renal disease in oro-facio-digital syndrome type I: a review."
supports: SUPPORT
snippet: >-
Intracerebral cysts and porencephaly or arachnoid cysts are rarely but are
repeatedly reported in orofaciodigital (OFD) syndrome type 1
explanation: "CNS malformations including intracranial cysts are recurrently reported."
- name: Intellectual Disability
description: >
Intellectual disability of variable severity occurs in approximately
50% of affected individuals.
phenotype_term:
preferred_term: Intellectual disability
term:
id: HP:0001249
label: Intellectual disability
evidence:
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
A first, detailed evaluation of brain MRIs from seven patients with cognitive
defects illustrated extensive variability
explanation: "Cognitive defects in OFD1 are accompanied by extensive brain structural variability."
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
mental retardation and mutations located in exons 3, 8, 9, 13, and 16
explanation: "Genotype-phenotype correlation suggests intellectual disability associates with mutations in specific exons."
- name: Tongue Nodules
description: >
Benign hamartomas of the tongue are a highly characteristic oral finding
in OFD1, often referred to as tongue nodules or lingual hamartomas.
phenotype_term:
preferred_term: Tongue hamartoma
term:
id: HP:0011802
label: Hamartoma of tongue
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
OFD1 is characterized by the following: oral features (lobulated tongue,
tongue nodules, cleft of the hard or soft palate, accessory gingival
frenulae, hypodontia, and other dental abnormalities)
explanation: >-
GeneReviews lists tongue nodules (lingual hamartomas) as a core oral
feature of OFD1.
- name: Cleft Palate
description: >
Cleft of the hard or soft palate occurs in a proportion of patients and
contributes to feeding difficulties and speech problems.
phenotype_term:
preferred_term: Cleft palate
term:
id: HP:0000175
label: Cleft palate
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
OFD1 is characterized by the following: oral features (lobulated tongue,
tongue nodules, cleft of the hard or soft palate, accessory gingival
frenulae, hypodontia, and other dental abnormalities)
explanation: >-
GeneReviews identifies cleft of the hard or soft palate as a recognized
oral feature of OFD1.
- name: Hypodontia
description: >
Missing teeth (hypodontia) and other dental abnormalities including
delayed eruption and supernumerary teeth are documented in OFD1.
phenotype_term:
preferred_term: Hypodontia
term:
id: HP:0000668
label: Hypodontia
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
OFD1 is characterized by the following: oral features (lobulated tongue,
tongue nodules, cleft of the hard or soft palate, accessory gingival
frenulae, hypodontia, and other dental abnormalities)
explanation: >-
GeneReviews lists hypodontia as a recognized oral-dental feature of OFD1.
- name: Hypertelorism
description: >
Widely spaced eyes (hypertelorism/telecanthus) are a characteristic
facial feature, often present with other midface anomalies.
phenotype_term:
preferred_term: Hypertelorism
term:
id: HP:0000316
label: Hypertelorism
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
facial features (widely spaced eyes, telecanthus, hypoplasia of the alae
nasi, median cleft or pseudocleft of the upper lip, micrognathia)
explanation: >-
GeneReviews lists widely spaced eyes (hypertelorism/telecanthus) as a
characteristic facial feature of OFD1.
- name: Underdeveloped Nasal Alae
description: >
Hypoplasia of the nasal alae (wings of the nostrils) is a recognized
midface feature associated with the craniofacial ciliopathy phenotype.
phenotype_term:
preferred_term: Hypoplasia of the alae nasi
term:
id: HP:0000430
label: Underdeveloped nasal alae
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
facial features (widely spaced eyes, telecanthus, hypoplasia of the alae
nasi, median cleft or pseudocleft of the upper lip, micrognathia)
explanation: >-
GeneReviews identifies hypoplasia of the alae nasi as a facial feature
of OFD1.
- name: Micrognathia
description: >
Small mandible (micrognathia) is part of the characteristic facial
dysmorphism in OFD1.
phenotype_term:
preferred_term: Micrognathia
term:
id: HP:0000347
label: Micrognathia
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
facial features (widely spaced eyes, telecanthus, hypoplasia of the alae
nasi, median cleft or pseudocleft of the upper lip, micrognathia)
explanation: >-
GeneReviews lists micrognathia as a characteristic facial feature of OFD1.
- name: Brachydactyly
description: >
Short digits (brachydactyly) are a recognized digital abnormality in OFD1,
often co-occurring with syndactyly and clinodactyly.
phenotype_term:
preferred_term: Brachydactyly
term:
id: HP:0001156
label: Brachydactyly
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
digital features (brachydactyly, syndactyly, clinodactyly of the fifth
finger, duplicated great toe)
explanation: >-
GeneReviews lists brachydactyly as a cardinal digital feature of OFD1.
- name: Syndactyly
description: >
Fusion of adjacent digits (syndactyly) affects hands and/or feet in a
subset of OFD1 patients.
phenotype_term:
preferred_term: Syndactyly
term:
id: HP:0001159
label: Syndactyly
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
digital features (brachydactyly, syndactyly, clinodactyly of the fifth
finger, duplicated great toe)
explanation: >-
GeneReviews lists syndactyly as a digital feature of OFD1.
- name: Clinodactyly
description: >
Incurving of the fifth finger (clinodactyly) is a recognized digital
abnormality in OFD1.
phenotype_term:
preferred_term: Clinodactyly of the fifth finger
term:
id: HP:0004209
label: Clinodactyly of the 5th finger
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
digital features (brachydactyly, syndactyly, clinodactyly of the fifth
finger, duplicated great toe)
explanation: >-
GeneReviews specifically identifies clinodactyly of the fifth finger as a
digital feature of OFD1.
- name: Duplicated Great Toe
description: >
Duplication of the hallux (great toe) is a distinctive digital
finding in OFD1, reported as a hallmark feature in the GeneReviews
clinical description.
phenotype_term:
preferred_term: Duplicated great toe
term:
id: HP:0010066
label: Duplication of phalanx of hallux
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
digital features (brachydactyly, syndactyly, clinodactyly of the fifth
finger, duplicated great toe)
explanation: >-
GeneReviews identifies duplicated great toe as a distinctive digital
hallmark of OFD1.
- name: Dandy-Walker Malformation
description: >
Cerebellar agenesis with or without Dandy-Walker malformation occurs
in a proportion of OFD1 patients with brain MRI abnormalities.
phenotype_term:
preferred_term: Dandy-Walker malformation
term:
id: HP:0001305
label: Dandy-Walker malformation
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
brain MRI findings (intracerebral cysts, agenesis of the corpus callosum,
cerebellar agenesis with or without Dandy-Walker malformation)
explanation: >-
GeneReviews lists Dandy-Walker malformation as a recognized brain MRI
finding in OFD1.
- name: Ventriculomegaly
description: >
Enlargement of the cerebral ventricles (ventriculomegaly) is seen on
brain MRI in patients with more severe CNS involvement.
phenotype_term:
preferred_term: Ventriculomegaly
term:
id: HP:0002119
label: Ventriculomegaly
evidence:
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
complete brain phenotype consisting of complete agenesis of the corpus
callosum, large single or multiple interhemispheric cysts, striking cortical
infolding of gyri, ventriculomegaly, mild molar tooth malformation and
moderate to severe cerebellar vermis hypoplasia
explanation: >-
Brain MRI series in OFD1 patients with cognitive defects demonstrates
ventriculomegaly as part of the severe brain phenotype.
- name: Cerebellar Vermis Hypoplasia
description: >
Hypoplasia of the cerebellar vermis, ranging from mild to severe, is a
brain MRI finding in OFD1 patients with CNS involvement.
phenotype_term:
preferred_term: Cerebellar vermis hypoplasia
term:
id: HP:0001320
label: Cerebellar vermis hypoplasia
evidence:
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
complete brain phenotype consisting of complete agenesis of the corpus
callosum, large single or multiple interhemispheric cysts, striking cortical
infolding of gyri, ventriculomegaly, mild molar tooth malformation and
moderate to severe cerebellar vermis hypoplasia
explanation: >-
Cerebellar vermis hypoplasia, ranging from mild to severe, was documented
in the brain MRI series of OFD1 patients.
- name: Autistic Behavior
description: >
Autistic features and attention-deficit/hyperactivity disorder behaviors
have been recognized in OFD1 patients, warranting behavioral assessment
and standard interventions.
phenotype_term:
preferred_term: Autistic behavior
term:
id: HP:0000729
label: Autistic behavior
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
standard treatments for attention-deficit/hyperactivity disorder and/or
autistic features
explanation: >-
GeneReviews management section addresses autistic features in OFD1,
confirming their clinical recognition.
genetic:
- name: OFD1 Mutations
association: Causative
notes: >
Mutations in OFD1 (Xp22.2), encoding a centrosomal/basal body
protein essential for ciliogenesis. Most mutations are truncating
(nonsense, frameshift, splice-site). The condition is typically
lethal in hemizygous males.
evidence:
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
Comprehensive mutation analysis in OFD1 revealed mutations in 37 female
patients from 30 families; 22 mutations have not been previously described
including two heterozygous deletions spanning OFD1 and neighbouring genes
explanation: "Large mutation study identifying 22 novel OFD1 mutations in 30 families, confirming genetic basis."
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
Mutations in OFD1 also cause X-linked Joubert syndrome (JBTS10) and
Simpson-Golabi-Behmel syndrome type 2 (SGBS2)
explanation: "OFD1 mutations can also cause Joubert syndrome and SGBS2, demonstrating allelic heterogeneity."
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
11 novel mutations, including nine frameshift, one nonsense, and one missense
mutation were identified, which spanned nine different exons
explanation: "Frameshift mutations predominate, consistent with loss-of-function mechanism."
- reference: PMID:16397067
reference_title: "Clinical, molecular, and genotype-phenotype correlation studies from 25 cases of oral-facial-digital syndrome type 1: a French and Belgian collaborative study."
supports: SUPPORT
snippet: >-
majority of mutations (65.5%) was located in exons 3, 8, 9, 13, and 16
explanation: "Mutation hotspot exons identified, useful for diagnostic screening."
- reference: PMID:23033313
reference_title: "Novel mutations including deletions of the entire OFD1 gene in 30 families with type 1 orofaciodigital syndrome: a study of the extensive clinical variability."
supports: SUPPORT
snippet: >-
Although the OFD1 gene apparently escapes X-inactivation, skewed inactivation
was observed in seven of 14 patients. The direction of skewing did not correlate
with disease severity
explanation: "X-inactivation patterns do not explain clinical variability despite OFD1 escaping X-inactivation."
diagnosis:
- name: Clinical and Molecular Diagnosis
description: >-
Oral-facial-digital syndrome type I is diagnosed in a female proband from
the characteristic oral (lingual hamartomas, clefting, frenula), facial,
and digital findings, frequently with polycystic kidney disease and CNS
malformations, and is confirmed by identification of a heterozygous OFD1
pathogenic variant. X-linked dominant OFD1 is typically lethal in males.
diagnosis_term:
preferred_term: molecular genetic testing
term:
id: MAXO:0000533
label: molecular genetic testing
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The diagnosis of OFD1 is established in a female proband with suggestive findings and a heterozygous OFD1 pathogenic variant identified by molecular genetic testing."
explanation: >-
GeneReviews defines the clinical-plus-molecular diagnostic criteria for
OFD1 in female probands.
treatments:
- name: Surgical Correction of Oral Anomalies
description: >
Surgery for cleft lip/palate, tongue nodules (lingual hamartomas), and
accessory frenulae. Speech therapy and management of otitis media as needed.
Orthodontic intervention and removal of accessory teeth for dental anomalies.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgery for cleft lip/palate, tongue nodules, accessory frenulae,
syndactyly, and polydactyly; speech therapy and aggressive treatment of
otitis media as needed; removal of accessory teeth; orthodontia for
malocclusion
explanation: >-
GeneReviews provides the standard surgical management protocol for OFD1
oral, digital, and dental manifestations.
- name: Renal and Multiorgan Surveillance
description: >
Annual surveillance beginning at age ten years includes blood pressure
measurement, serum creatinine, and ultrasound of the kidneys, liver,
pancreas, and ovaries for cystic disease. Dialysis or renal transplantation
for end-stage renal disease.
treatment_term:
preferred_term: supportive care
term:
id: MAXO:0000950
label: supportive care
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Annual blood pressure; serum creatinine; and kidney, liver, pancreas, and
ovarian ultrasound for cystic disease beginning at age ten years
explanation: >-
GeneReviews defines the structured annual surveillance protocol for renal
and multiorgan cystic disease in OFD1 starting at age 10 years.
- reference: PMID:9482645
reference_title: "Central nervous system malformations and early end-stage renal disease in oro-facio-digital syndrome type I: a review."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Longitudinal follow-up of OFD 1 carriers should be performed, and renal
function should be assessed in those with cysts because the functional prognosis
of this developmental anomaly may be worse than usually reported in the
literature
explanation: "Recommends longitudinal renal monitoring due to risk of progressive renal failure."
- name: Neurodevelopmental Support
description: >
Early intervention, individualized education plans, and behavioral
assessment for intellectual disability, developmental delay, and
autistic/ADHD features.
treatment_term:
preferred_term: supportive care
term:
id: MAXO:0000950
label: supportive care
- name: Genetic Counseling
description: >
X-linked dominant inheritance with ~75% de novo variants; risk of
transmission 50% per pregnancy with recurrent miscarriage of affected males.
Prenatal testing and preimplantation genetic testing are available once the
OFD1 pathogenic variant is identified.
treatment_term:
preferred_term: Genetic Counseling
term:
id: NCIT:C15240
label: Genetic Counseling
evidence:
- reference: PMID:20301367
reference_title: "Oral-Facial-Digital Syndrome Type I."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
OFD1 is inherited in an X-linked manner with, typically, male lethality.
The full OFD1 phenotype has not been described in males beyond the perinatal
period. Approximately 75% of affected females represent simplex cases
explanation: >-
GeneReviews describes the inheritance pattern and genetic counseling
context for OFD1, including de novo rate and male lethality.
datasets: []
references:
- reference: PMID:20301367
title: "Oral-Facial-Digital Syndrome Type I."
tags:
- GeneReviews
findings: []
- reference: DOI:10.1038/s41467-023-37340-z
title: An actin filament branching surveillance system regulates cell cycle progression, cytokinesis and primary ciliogenesis
findings: []
- reference: DOI:10.1080/15548627.2022.2067383
title: 'Crosstalk between cilia and autophagy: implication for human diseases'
findings: []
- reference: DOI:10.1093/hmg/ddaa029
title: The HOPS complex subunit VPS39 controls ciliogenesis through autophagy
findings: []
- reference: DOI:10.1186/s12887-024-05304-x
title: Case series of kidney transplantation in two pediatric recipients with rare genetic diseases and intellectual disability
findings: []
- reference: DOI:10.15252/embj.2020106503
title: The TBC1D31/praja2 complex controls primary ciliogenesis through PKA‐directed OFD1 ubiquitylation
findings: []
- reference: DOI:10.15252/embr.202154160
title: Myosin VI regulates ciliogenesis by promoting the turnover of the centrosomal/satellite protein OFD1
findings: []
- reference: DOI:10.3390/genes14020327
title: Autistic Behavior as Novel Clinical Finding in OFD1 Syndrome
findings: []
Disease Pathophysiology Research Report
Target Disease - Disease Name: Orofaciodigital syndrome type I (OFD1 syndrome) - MONDO ID: - Category: Mendelian (X‑linked dominant ciliopathy)
Pathophysiology overview OFD1 syndrome is a primary ciliopathy caused by pathogenic variants in OFD1, a centriolar and centriolar‑satellite protein essential for biogenesis of the primary cilium and for the integrity of distal appendages at the mother centriole. OFD1 localizes to the distal end of centrioles/basal bodies and to pericentriolar satellites, where its precise abundance and turnover control the initiation of ciliogenesis, distal appendage assembly, and downstream cilia‑dependent signaling in development. Failure of these processes produces a characteristic spectrum of craniofacial/oral, digital, brain, and renal phenotypes. Mechanistically, OFD1 is regulated by selective autophagy and by the ubiquitin–proteasome system (UPS), and it interfaces with actin nucleation (Arp2/3) to couple centrosomal actin dynamics to ciliogenesis. Disruption of OFD1 leads to defects in distal appendages (e.g., altered CEP164 homeostasis), impaired removal of CP110 from the mother centriole, and abnormal Hedgehog/Wnt signaling, which together explain key malformations and kidney disease in OFD1 patients (iaconis2020thehopscomplex pages 10-10, morleo2023crosstalkbetweencilia pages 9-10, senatore2021thetbc1d31praja2complex pages 1-2, magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5, cao2023anactinfilament pages 3-4, papuc2023autisticbehavioras pages 5-7).
1) Core pathophysiology: mechanisms, dysregulated pathways, affected processes - Centriole/satellite roles and ciliogenesis: OFD1 is a centrosome/basal‑body and centriolar‑satellite protein “required for primary cilia formation” and for axoneme/ distal assembly; its removal from the satellite pool is a gatekeeping step to commence ciliogenesis (Autophagy review, Morleo et al., 2023, URL: https://doi.org/10.1080/15548627.2022.2067383; Human Molecular Genetics, Iaconis et al., 2020, URL: https://doi.org/10.1093/hmg/ddaa029) (morleo2023crosstalkbetweencilia pages 9-10, iaconis2020thehopscomplex pages 10-10). - Autophagy–cilia axis: Selective autophagy of satellite OFD1 initiates ciliogenesis (“removal of OFD1 from centriolar satellites through the autophagy machinery is required to initiate ciliogenesis”). OFD1 also participates in autophagosome biogenesis, indicating bidirectional crosstalk (EMBO J., 2021, URL: https://doi.org/10.15252/embj.2020106503; Autophagy, 2023, URL above) (senatore2021thetbc1d31praja2complex pages 1-2, morleo2023crosstalkbetweencilia pages 9-10). - UPS control via PKA–Praja2: GPCR–cAMP–PKA phosphorylates OFD1 at Ser735 to promote Praja2 (E3)-mediated ubiquitylation and proteasomal degradation, a pathway essential for ciliogenesis and cilium morphology/dynamics in vivo (Medaka) (EMBO J., 2021, URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - Distal appendage homeostasis and actomyosin: Myosin VI binds OFD1 and “regulates the localisation of OFD1 at the centrioles and, as a consequence, the recruitment of the distal appendage protein CEP164.” Loss of myosin VI causes accumulation of OFD1 along centriole walls, increases CEP164 at centrioles, and “triggers a severe defect in ciliogenesis,” consistent with a role in OFD1 turnover possibly via short‑range transport on centrosomal actin (EMBO reports, 2022, URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 3-5, magistrati2022myosinviregulates pages 9-10). - Endolysosomal/autophagy machinery: VPS39 (HOPS) controls ciliogenesis through autophagy in renal cells and in vivo, linking lysosomal tethering machinery to the distribution of OFD1 at centriolar satellites and cilium assembly (Human Molecular Genetics, 2020, URL: https://doi.org/10.1093/hmg/ddaa029) (iaconis2020thehopscomplex pages 10-10, iaconis2020thehopscomplex pages 9-10). - Actin/Arp2/3 coupling: OFD1 directly binds the seven‑subunit Arp2/3 complex (“OFD1‑Flag pulled down the purified 7‑subunit Arp2/3 complex”) and “functions as a class II nucleation promoting factor to promote centrosomal actin branching.” OFD1 loss reduces centrosomal F‑actin, revealing a cytoskeletal mechanism that impacts ciliogenesis and cell‑cycle states (Nature Communications, 2023, URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4). - Signaling consequences: OFD1 deficiency perturbs cilia‑dependent Hedgehog (Shh) and Wnt signaling in development, underpinning neurodevelopmental and craniofacial patterning phenotypes (Genes, 2023, URL: https://doi.org/10.3390/genes14020327; additional summaries) (ekumi2020biochemicalandcellular pages 24-26, papuc2023autisticbehavioras pages 5-7).
2) Key molecular players - Genes/proteins (HGNC gene symbols): OFD1; distal appendage components CEP164, CEP83, SCLT1, FBF1; transition‑onset kinases TTBK2 and MARK4; CP110; centriolar satellite scaffold PCM1; motor MYO6 (myosin VI); HOPS subunit VPS39; PKA (PRKACA/PRKACB), E3 ligase PRAJA2; Arp2/3 subunits (ACTR2/ARP2, ACTR3/ARP3, ARPCs) (iaconis2020thehopscomplex pages 10-10, magistrati2022myosinviregulates pages 3-5, ekumi2020biochemicalandcellular pages 24-26, senatore2021thetbc1d31praja2complex pages 1-2, cao2023anactinfilament pages 1-2). - Chemical entities (CHEBI/biochemical): cAMP (PKA activation); autophagy modulators (general ATG/LC3 pathway); actin monomers/polymers (cytoskeletal branching). Where tested, Arp2/3 inhibitors (e.g., CK‑666) were used experimentally to probe pathways (Nature Communications, 2023) (cao2023anactinfilament pages 1-2). - Cell types (CL terms, narrative): renal tubular epithelial cells; neural progenitors/neurons; craniofacial mesenchyme/epithelia; multiciliated and primary ciliated epithelia (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7). - Anatomical locations (UBERON terms, narrative): basal body/centrioles (distal end), centriolar satellites (pericentriolar cytoplasm), transition zone; affected organs: kidney, brain, craniofacial/oral tissues, digits (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7).
3) Biological processes (GO-aligned, narrative) - Cilium assembly and organization; basal body docking; distal appendage assembly and maintenance (CEP164/CEP83/SCLT1/FBF1); CP110 removal and axoneme initiation (TTBK2/MARK4 recruitment via CEP164); centriolar satellite organization and proteostasis; selective macroautophagy; ubiquitin‑dependent protein catabolic process; GPCR–cAMP–PKA signaling; actin filament branching (Arp2/3), centrosomal actin dynamics; Hedgehog and Wnt signal transduction (ekumi2020biochemicalandcellular pages 24-26, morleo2023crosstalkbetweencilia pages 9-10, senatore2021thetbc1d31praja2complex pages 1-2, cao2023anactinfilament pages 1-2, magistrati2022myosinviregulates pages 3-5).
4) Cellular components (GO-aligned, narrative) - Centriole/basal body distal end and distal appendages (CEP164‑positive); centriolar satellites (PCM1‑positive); transition zone; primary cilium axoneme; pericentriolar material; endolysosomal compartments and autophagosomes; actin cytoskeleton at the centrosome (magistrati2022myosinviregulates pages 3-5, iaconis2020thehopscomplex pages 10-10, cao2023anactinfilament pages 1-2).
5) Disease progression: sequence of events - Initiation: Pathogenic OFD1 variants impair OFD1 dosage/localization at centrioles and satellites. Dysregulated clearance by autophagy and/or heightened degradation via UPS (PKA/Praja2) disturb the timing and level of OFD1 needed for ciliogenesis (morleo2023crosstalkbetweencilia pages 9-10, senatore2021thetbc1d31praja2complex pages 1-2). - Ciliogenesis block: Excess satellite OFD1 or mislocalized centriolar OFD1 impairs distal appendage homeostasis, CEP164 recruitment balance, and prevents CP110 removal, arresting axoneme elongation (EMBO reports, 2022; Ekumi synopsis) (magistrati2022myosinviregulates pages 3-5, ekumi2020biochemicalandcellular pages 24-26). - Signaling derangement: Absent/defective primary cilia lead to reduced or misregulated Shh/Wnt pathways in development, affecting brain patterning and craniofacial morphogenesis; renal tubular mechanosensation and signaling are perturbed, predisposing to cystogenesis (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7, ekumi2020biochemicalandcellular pages 24-26). - Tissue outcomes: Craniofacial/oral anomalies, digital malformations, neurodevelopmental defects (including periventricular nodular heterotopia and reported autistic behavior), and cystic kidney disease with risk of CKD progression (Genes, 2023; HMG, 2020) (papuc2023autisticbehavioras pages 5-7, iaconis2020thehopscomplex pages 10-10).
6) Phenotypic manifestations and mechanistic links - Craniofacial/oral: Oral malformations (lobulated tongue, clefting), facial dysmorphism; linked to disrupted Shh/Wnt and ciliary morphogen signaling (Genes, 2023, URL: https://doi.org/10.3390/genes14020327) (papuc2023autisticbehavioras pages 5-7). - Digits: Brachydactyly/polydactyly, reflecting ciliopathy‑related limb bud patterning defects (Genes, 2023) (papuc2023autisticbehavioras pages 5-7). - Brain/CNS: Malformations (e.g., periventricular nodular heterotopia), developmental delay; a 2023 case highlighted autistic behavior as a novel feature in a female with de novo OFD1 variant (Genes, 2023, URL above) (papuc2023autisticbehavioras pages 9-11, papuc2023autisticbehavioras pages 5-7). - Kidney: Cystic kidney disease and progression to renal dysfunction; mechanistically tied to defective primary cilia and autophagy‑ciliogenesis control (HMG, 2020, URL: https://doi.org/10.1093/hmg/ddaa029) (iaconis2020thehopscomplex pages 10-10).
Direct mechanistic details and recent developments (2023–2024 prioritized) - Autophagy–ciliogenesis crosstalk (2023 review): OFD1 resides at centrioles and satellites, and “selective autophagic degradation of ciliary proteins has been shown to control ciliogenesis,” with OFD1 among satellite cargos whose removal licenses cilium assembly (Autophagy, 2023, URL: https://doi.org/10.1080/15548627.2022.2067383) (morleo2023crosstalkbetweencilia pages 9-10). - PKA–Praja2–OFD1 UPS pathway (EMBO J., 2021): “Upon GPCR‑cAMP stimulation, PKA phosphorylates OFD1 at ser735, thus promoting OFD1 proteolysis through the praja2‑UPS circuitry,” a pathway “essential for ciliogenesis,” and a non‑phosphorylatable OFD1 mutant “dramatically affects cilium morphology and dynamics” (URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - Myosin VI control of OFD1 and CEP164 (EMBO reports, 2022): “Myosin VI regulates the localisation of OFD1 at the centrioles and, as a consequence, the recruitment of the distal appendage protein CEP164… loss of myosin VI triggers a severe defect in ciliogenesis that could be causally linked to an impairment in the autophagic removal of OFD1 from satellites” (URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5). - Arp2/3—OFD1 link (Nature Communications, 2023): “OFD1‑Flag pulled down the purified 7‑subunit Arp2/3 complex,” and “OFD1 functions as a class II Nucleation promoting factor to promote Arp2/3 complex‑mediated actin branching,” providing a cytoskeletal mechanism that integrates actin branching status with ciliogenesis and cell‑cycle control (URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4). - Distal appendage/CP110 program (synthesis of experimental literature): Distal appendage proteins (CEP83/CEP164/SCLT1/FBF1) recruit TTBK2 and MARK4, which remove CP110 from the mother centriole to initiate ciliogenesis; OFD1 is required at the distal centriole/appendages for this program to proceed (synopses and experimental context) (ekumi2020biochemicalandcellular pages 24-26, magistrati2022myosinviregulates pages 3-5).
Current applications and real‑world implementations - Renal surveillance and management: Given the risk of renal cystic disease and chronic kidney disease in OFD1 syndrome, clinical sources recommend periodic renal imaging and multidisciplinary management; mechanistic nephrology literature underscores the autophagy–cilia connection in kidney epithelia (Genes, 2023; HMG, 2020; URLs above) (papuc2023autisticbehavioras pages 5-7, iaconis2020thehopscomplex pages 10-10).
Expert opinions and authoritative analyses - Autophagy–cilia field leadership (2023): Morleo et al. synthesize “the current knowledge about [the cilia–autophagy] axis and challenges… as well as the implication for ciliopathies,” explicitly placing OFD1 within autophagy‑regulated ciliogenesis (Autophagy, 2023, URL: https://doi.org/10.1080/15548627.2022.2067383) (morleo2023crosstalkbetweencilia pages 9-10). - UPS signaling at centrosomes (2021): EMBO Journal study establishes a centrosomal transduction unit “that links GPCR signalling to ubiquitylation and proteolysis of the ciliopathy protein OFD1,” setting a paradigm for proteostatic gating of ciliogenesis (URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - Distal appendage homeostasis and motor coupling (2022): EMBO reports identifies myosin VI as a regulator that tunes OFD1 mobility and CEP164 levels, adding actomyosin regulation to centriole‑distal architecture control (URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5). - Cytoskeletal integration (2023): Nature Communications reveals OFD1 as a class II NPF for Arp2/3, “linking actin filament branching surveillance” to ciliogenesis and cell‑cycle transitions (URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4).
Relevant statistics and data - Experimental quantitation: Myosin VI depletion increased OFD1 and CEP164 intensities at centrioles in cultured cells with n>140 cells per condition and p‑values reported, demonstrating robust effects on distal appendage homeostasis (EMBO reports, 2022, URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 3-5). - Clinical spectrum: OFD1 is consistently characterized as a multisystem ciliopathy with oral, facial, digital, brain, and renal involvement; recent case documentation extends neurobehavioral features to include autistic behavior in a female with de novo OFD1 variant (Genes, 2023, URL: https://doi.org/10.3390/genes14020327) (papuc2023autisticbehavioras pages 9-11, papuc2023autisticbehavioras pages 5-7).
Evidence artifact | Mechanistic theme | Specific finding | Experimental system/context | Key molecules | Implication for OFD1 disease | Citation (journal, year) | DOI/URL | |---|---|---|---|---|---|---| | Autophagy-mediated OFD1 clearance | Selective autophagic removal of OFD1 from centriolar satellites is required to initiate ciliogenesis | Cell culture (serum starvation), animal models (Medaka), reviews | OFD1, ATG proteins, LC3 (centriolar satellite pool), CP110 (downstream) | Failure to clear OFD1 → blocked ciliogenesis → ciliopathy phenotypes (kidney cysts, brain malformations) | Autophagy, 2023 (morleo2023crosstalkbetweencilia pages 9-10), Hum Mol Genet, 2020 (iaconis2020thehopscomplex pages 10-10) | https://doi.org/10.1080/15548627.2022.2067383 | | PKA–Praja2 ubiquitylation of OFD1 | PKA phosphorylation (Ser735) promotes PRAJA2-mediated ubiquitylation and proteasomal degradation of OFD1 linking GPCR–cAMP to ciliogenesis control | Serum-deprived cells; Medaka in vivo perturbation | OFD1 (pSer735), PKA, PRAJA2 (E3), TBC1D31 | Misregulation → altered OFD1 stability and defective cilium morphology/dynamics → developmental defects | The EMBO Journal, 2021 (senatore2021thetbc1d31praja2complex pages 1-2) | https://doi.org/10.15252/embj.2020106503 | | Myosin VI promotes OFD1 turnover and distal appendage homeostasis | Myosin VI binds OFD1 and promotes its turnover at centrioles; myosin VI depletion increases OFD1 and CEP164 at centrioles and impairs ciliogenesis | Human non-tumoral cell lines; IF, FRAP, biochemical pull-downs | OFD1, Myosin VI, CEP164, PCM1 | Perturbed myosin VI → OFD1 accumulation/altered CEP164 recruitment → defective distal appendage function and ciliogenesis | EMBO Reports, 2022 (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5) | https://doi.org/10.15252/embr.202154160 | | VPS39 (HOPS) links endolysosomal/autophagy machinery to ciliogenesis | VPS39 (HOPS) controls autophagy-dependent regulation of centriolar satellite proteins, affecting OFD1 distribution and ciliogenesis | Human renal cells; medaka in vivo models | VPS39 (HOPS), OFD1, autophagy components (LC3, lysosomal machinery) | Dysregulated VPS39/autophagy → altered OFD1 satellite pool → defective ciliogenesis, kidney ciliopathy phenotypes | Human Molecular Genetics, 2020 (iaconis2020thehopscomplex pages 10-10, iaconis2020thehopscomplex pages 9-10) | https://doi.org/10.1093/hmg/ddaa029 | | OFD1–Arp2/3 / actin branching link | OFD1 directly binds Arp2/3 and acts as a class II nucleation promoting factor to promote centrosomal actin branching; OFD1 loss reduces centrosomal F-actin | Biochemistry (pulldown, actin polymerization assays), cultured cells (HeLa, MEFs) | OFD1, Arp2/3 complex (ARP2/ARP3/ARPC2), actin | Loss of OFD1 → reduced centrosomal actin branching → impacts ciliogenesis and cell-cycle coupling; provides mechanistic link to cytoskeleton-dependent ciliogenesis | Nature Communications, 2023 (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4) | https://doi.org/10.1038/s41467-023-37340-z | | Distal appendage (CEP164/TTBK2) and CP110 removal program | Distal appendage proteins (Cep83/Cep164/SCLT1/FBF1) recruit kinases (TTBK2/MARK4) to trigger CP110 removal from the mother centriole; OFD1 is required for distal centriole/appendage assembly | Cell biology studies, reviews, IF and molecular perturbation assays | CEP164, TTBK2, MARK4, CP110, OFD1, C2CD3 | Improper OFD1 function/distribution → defective distal appendage assembly, failed CP110 removal → blocked axoneme elongation and ciliogenesis | (mechanistic reviews/experimental reports) EMBO Reports 2022, Ekumi 2020 (magistrati2022myosinviregulates pages 3-5, ekumi2020biochemicalandcellular pages 24-26) | https://doi.org/10.15252/embr.202154160 | | Disrupted ciliary signaling (Hedgehog/Wnt) after OFD1 loss | OFD1 deficiency perturbs cilia-dependent signaling (Shh/Hedgehog and Wnt) during development, contributing to brain and craniofacial defects | Cellular models and developmental/animal studies; genetic analyses | OFD1, components of SHH and WNT pathways, IFT machinery | Altered signaling → neurodevelopmental malformations, midline/brain defects, patterning abnormalities seen in OFD1 patients | Genes, 2023 (ekumi2020biochemicalandcellular pages 24-26, papuc2023autisticbehavioras pages 5-7) | https://doi.org/10.3390/genes14020327 | | Clinical application: kidney replacement in OFD1-related ESKD | Reports document progression to end-stage kidney disease (ESKD) in OFD1 patients and case descriptions of kidney transplantation in affected individuals | Case reports / case series (clinical transplant reports) | OFD1 (genetic diagnosis), clinical management teams | Kidney transplantation has been performed in OFD1-related ESKD; highlights need for renal surveillance and multidisciplinary care | BMC Pediatrics / clinical case series, 2024 (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7) | https://doi.org/10.1186/s12887-024-05304-x |
Table: Key mechanistic themes, experimental contexts, molecular players, disease implications, and primary citations (context IDs) summarizing OFD1-related pathophysiology from the gathered evidence.
Ontology‑ready annotations (narrative labels) - Gene/protein (HGNC): OFD1; CEP164; CEP83; SCLT1; FBF1; TTBK2; MARK4; CP110; PCM1; MYO6; VPS39; PRKACA/PRKACB; PJA2; ACTR2/ACTR3/ARPCs (iaconis2020thehopscomplex pages 10-10, magistrati2022myosinviregulates pages 3-5, cao2023anactinfilament pages 1-2, senatore2021thetbc1d31praja2complex pages 1-2). - Biological process (GO): cilium assembly; ciliary transition from CP110‑capped basal body to axoneme initiation; distal appendage organization; centriolar satellite organization; selective macroautophagy; ubiquitin‑dependent protein catabolism; GPCR–cAMP–PKA signaling; actin filament branching via Arp2/3; Hedgehog/Wnt signal transduction (morleo2023crosstalkbetweencilia pages 9-10, ekumi2020biochemicalandcellular pages 24-26, cao2023anactinfilament pages 1-2, senatore2021thetbc1d31praja2complex pages 1-2). - Cellular component (GO): centriole/basal body distal appendage; centriolar satellite; transition zone; primary cilium; autophagosome; pericentriolar actin network (magistrati2022myosinviregulates pages 3-5, iaconis2020thehopscomplex pages 10-10, cao2023anactinfilament pages 1-2). - Phenotype (HP): oral cavity malformations (e.g., lobulated tongue, cleft palate), facial dysmorphism, digital anomalies, brain malformations/neurodevelopmental delay, renal cystic disease; emerging neurobehavioral feature: autistic behavior (papuc2023autisticbehavioras pages 5-7, papuc2023autisticbehavioras pages 9-11). - Cell types (CL): renal tubular epithelial cells; neural progenitors/neurons; craniofacial epithelial/mesenchymal cells (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7). - Anatomy (UBERON): kidney; brain; craniofacial/oral tissues; limb/digits; centrosome/basal body; transition zone (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7). - Chemicals (CHEBI): cAMP; actin (G‑actin/F‑actin polymers) (senatore2021thetbc1d31praja2complex pages 1-2, cao2023anactinfilament pages 1-2).
Selected direct quotes supporting key statements - “Upon GPCR‑cAMP stimulation, PKA phosphorylates OFD1 at ser735, thus promoting OFD1 proteolysis through the praja2‑UPS circuitry… This pathway is essential for ciliogenesis.” (EMBO Journal, 2021; URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - “Myosin VI regulates the localisation of OFD1 at the centrioles and, as a consequence, the recruitment of the distal appendage protein cep164… loss of myosin VI triggers a severe defect in ciliogenesis that could be causally linked to an impairment in the autophagic removal of OFD1 from satellites.” (EMBO reports, 2022; URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 9-10). - “OFD1‑Flag pulled down the purified 7‑subunit Arp2/3 complex,” and “OFD1 functions as a class II Nucleation promoting factor to promote Arp2/3 complex‑mediated actin branching.” (Nature Communications, 2023; URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 3-4, cao2023anactinfilament pages 1-2).
Limitations - Some genotype–phenotype correlations (e.g., exon‑level associations, X‑inactivation details) and clinical management statistics require broader clinical cohorts; we cite recent case‑level and mechanistic sources within 2020–2024, but comprehensive epidemiology was not available in the retrieved context (papuc2023autisticbehavioras pages 5-7).
References (with URLs and publication dates) - Morleo M. et al. Crosstalk between cilia and autophagy: implication for human diseases. Autophagy. 2023 May;19:24–43. URL: https://doi.org/10.1080/15548627.2022.2067383 (morleo2023crosstalkbetweencilia pages 9-10). - Senatore E. et al. The TBC1D31/praja2 complex controls primary ciliogenesis through PKA‑directed OFD1 ubiquitylation. The EMBO Journal. 2021 May 2;40(10). URL: https://doi.org/10.15252/embj.2020106503 (senatore2021thetbc1d31praja2complex pages 1-2). - Magistrati E. et al. Myosin VI regulates ciliogenesis by promoting the turnover of the centrosomal/satellite protein OFD1. EMBO Reports. 2022 Dec;23(3). URL: https://doi.org/10.15252/embr.202154160 (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5). - Iaconis D. et al. The HOPS complex subunit VPS39 controls ciliogenesis through autophagy. Human Molecular Genetics. 2020 Feb;29(6):1018–1029. URL: https://doi.org/10.1093/hmg/ddaa029 (iaconis2020thehopscomplex pages 10-10, iaconis2020thehopscomplex pages 9-10). - Cao M. et al. An actin filament branching surveillance system regulates cell cycle progression, cytokinesis and primary ciliogenesis. Nature Communications. 2023 Mar;14: (article number). URL: https://doi.org/10.1038/s41467-023-37340-z (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4). - Papuc S.M. et al. Autistic Behavior as Novel Clinical Finding in OFD1 Syndrome. Genes. 2023 Jan;14(2):327. URL: https://doi.org/10.3390/genes14020327 (papuc2023autisticbehavioras pages 9-11, papuc2023autisticbehavioras pages 5-7). - Additional mechanistic synopsis (distal appendages/CP110 program): distal appendage proteins recruit TTBK2/MARK4 to remove CP110 and initiate ciliogenesis; OFD1 supports distal centriole/appendage assembly (context synthesis from retrieved sources) (ekumi2020biochemicalandcellular pages 24-26, magistrati2022myosinviregulates pages 3-5).
References
(iaconis2020thehopscomplex pages 10-10): Daniela Iaconis, Claudia Crina, Simona Brillante, Alessia Indrieri, Manuela Morleo, and Brunella Franco. The hops complex subunit vps39 controls ciliogenesis through autophagy. Human Molecular Genetics, 29:1018-1029, Feb 2020. URL: https://doi.org/10.1093/hmg/ddaa029, doi:10.1093/hmg/ddaa029. This article has 22 citations and is from a domain leading peer-reviewed journal.
(morleo2023crosstalkbetweencilia pages 9-10): Manuela Morleo, Helena L.A. Vieira, Petra Pennekamp, Alessandro Palma, Liliana Bento-Lopes, Heymut Omran, Susana S. Lopes, Duarte C. Barral, and Brunella Franco. Crosstalk between cilia and autophagy: implication for human diseases. Autophagy, 19:24-43, May 2023. URL: https://doi.org/10.1080/15548627.2022.2067383, doi:10.1080/15548627.2022.2067383. This article has 32 citations and is from a domain leading peer-reviewed journal.
(senatore2021thetbc1d31praja2complex pages 1-2): Emanuela Senatore, Francesco Chiuso, Laura Rinaldi, Daniela Intartaglia, Rossella Delle Donne, Emilia Pedone, Bruno Catalanotti, Luciano Pirone, Bianca Fiorillo, Federica Moraca, Giuliana Giamundo, Giovanni Scala, Andrea Raffeiner, Omar Torres‐Quesada, Eduard Stefan, Marcel Kwiatkowski, Alienke van Pijkeren, Manuela Morleo, Brunella Franco, Corrado Garbi, Ivan Conte, and Antonio Feliciello. The tbc1d31/praja2 complex controls primary ciliogenesis through pka‐directed ofd1 ubiquitylation. The EMBO Journal, May 2021. URL: https://doi.org/10.15252/embj.2020106503, doi:10.15252/embj.2020106503. This article has 37 citations.
(magistrati2022myosinviregulates pages 9-10): Elisa Magistrati, Giorgia Maestrini, Carlos A Niño, Mariana Lince‐Faria, Galina Beznoussenko, Alexandre Mironov, Elena Maspero, Mónica Bettencourt‐Dias, and Simona Polo. Myosin vi regulates ciliogenesis by promoting the turnover of the centrosomal/satellite protein ofd1. EMBO reports, Dec 2022. URL: https://doi.org/10.15252/embr.202154160, doi:10.15252/embr.202154160. This article has 13 citations and is from a highest quality peer-reviewed journal.
(magistrati2022myosinviregulates pages 3-5): Elisa Magistrati, Giorgia Maestrini, Carlos A Niño, Mariana Lince‐Faria, Galina Beznoussenko, Alexandre Mironov, Elena Maspero, Mónica Bettencourt‐Dias, and Simona Polo. Myosin vi regulates ciliogenesis by promoting the turnover of the centrosomal/satellite protein ofd1. EMBO reports, Dec 2022. URL: https://doi.org/10.15252/embr.202154160, doi:10.15252/embr.202154160. This article has 13 citations and is from a highest quality peer-reviewed journal.
(cao2023anactinfilament pages 3-4): Muqing Cao, Xiaoxiao Zou, Chaoyi Li, Zaisheng Lin, Ni Wang, Zhongju Zou, Youqiong Ye, Joachim Seemann, Beth Levine, Zaiming Tang, and Qing Zhong. An actin filament branching surveillance system regulates cell cycle progression, cytokinesis and primary ciliogenesis. Nature Communications, Mar 2023. URL: https://doi.org/10.1038/s41467-023-37340-z, doi:10.1038/s41467-023-37340-z. This article has 18 citations and is from a highest quality peer-reviewed journal.
(papuc2023autisticbehavioras pages 5-7): Sorina Mihaela Papuc, Alina Erbescu, Adelina Glangher, Ioana Streata, Anca-Lelia Riza, Magdalena Budisteanu, and Aurora Arghir. Autistic behavior as novel clinical finding in ofd1 syndrome. Genes, 14:327, Jan 2023. URL: https://doi.org/10.3390/genes14020327, doi:10.3390/genes14020327. This article has 5 citations and is from a poor quality or predatory journal.
(iaconis2020thehopscomplex pages 9-10): Daniela Iaconis, Claudia Crina, Simona Brillante, Alessia Indrieri, Manuela Morleo, and Brunella Franco. The hops complex subunit vps39 controls ciliogenesis through autophagy. Human Molecular Genetics, 29:1018-1029, Feb 2020. URL: https://doi.org/10.1093/hmg/ddaa029, doi:10.1093/hmg/ddaa029. This article has 22 citations and is from a domain leading peer-reviewed journal.
(cao2023anactinfilament pages 1-2): Muqing Cao, Xiaoxiao Zou, Chaoyi Li, Zaisheng Lin, Ni Wang, Zhongju Zou, Youqiong Ye, Joachim Seemann, Beth Levine, Zaiming Tang, and Qing Zhong. An actin filament branching surveillance system regulates cell cycle progression, cytokinesis and primary ciliogenesis. Nature Communications, Mar 2023. URL: https://doi.org/10.1038/s41467-023-37340-z, doi:10.1038/s41467-023-37340-z. This article has 18 citations and is from a highest quality peer-reviewed journal.
(ekumi2020biochemicalandcellular pages 24-26): KM Ekumi. Biochemical and cellular characterization of ddx59 helicase that is associated oral-facial-digital syndrome. Unknown journal, 2020.
(papuc2023autisticbehavioras pages 9-11): Sorina Mihaela Papuc, Alina Erbescu, Adelina Glangher, Ioana Streata, Anca-Lelia Riza, Magdalena Budisteanu, and Aurora Arghir. Autistic behavior as novel clinical finding in ofd1 syndrome. Genes, 14:327, Jan 2023. URL: https://doi.org/10.3390/genes14020327, doi:10.3390/genes14020327. This article has 5 citations and is from a poor quality or predatory journal.