Donnai-Barrow syndrome is a rare LRP2-related autosomal recessive disorder characterized by multiorgan megalin dysfunction with developmental delay, sensorineural hearing impairment, ocular anomalies, and renal tubular proteinuria. Available evidence supports impaired megalin-mediated receptor-mediated endocytosis as the proximal disease mechanism.
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name: Donnai-Barrow syndrome
creation_date: "2026-04-15T15:45:03Z"
updated_date: "2026-04-15T18:55:00Z"
description: >-
Donnai-Barrow syndrome is a rare LRP2-related autosomal recessive disorder
characterized by multiorgan megalin dysfunction with developmental delay,
sensorineural hearing impairment, ocular anomalies, and renal tubular
proteinuria. Available evidence supports impaired megalin-mediated
receptor-mediated endocytosis as the proximal disease mechanism.
category: Mendelian
parents:
- hereditary disease
synonyms:
- FOAR syndrome
disease_term:
preferred_term: Donnai-Barrow syndrome
term:
id: MONDO:0009104
label: Donnai-Barrow syndrome
inheritance:
- name: Autosomal recessive inheritance
description: >-
Donnai-Barrow syndrome is an autosomal recessive disorder caused by
biallelic pathogenic variants in LRP2.
inheritance_term:
preferred_term: Autosomal recessive inheritance
term:
id: HP:0000007
label: Autosomal recessive inheritance
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
LRP2 is implicated in an autosomal recessive disorder characterized by
dimorphisms, ocular anomalies, sensorineural deafness, proteinuria,
epilepsy, and intellectual disability: a clinical condition called
Donnai-Barrow syndrome (DBS) or facio-oculo-acoustico-renal (FOAR)
syndrome.
explanation: This directly supports autosomal recessive inheritance in LRP2-related Donnai-Barrow syndrome.
pathophysiology:
- name: LRP2-related megalin endocytic dysfunction
description: >-
Donnai-Barrow syndrome is caused by LRP2 deficiency. Loss of megalin
disrupts multiligand receptor-mediated endocytosis across affected organs,
including proximal renal tubule and sensory tissues.
genes:
- preferred_term: LRP2
term:
id: hgnc:6694
label: LRP2
cell_types:
- preferred_term: proximal tubule epithelial cell
term:
id: CL:0002306
label: epithelial cell of proximal tubule
- preferred_term: retinal pigment epithelial cell
term:
id: CL:0002586
label: retinal pigment epithelial cell
biological_processes:
- preferred_term: receptor-mediated endocytosis
modifier: ABNORMAL
term:
id: GO:0006898
label: receptor-mediated endocytosis
locations:
- preferred_term: proximal tubule
term:
id: UBERON:0004134
label: proximal tubule
- preferred_term: choroid plexus
term:
id: UBERON:0001886
label: choroid plexus
- preferred_term: retina
term:
id: UBERON:0000966
label: retina
- preferred_term: internal ear
term:
id: UBERON:0001846
label: internal ear
evidence:
- reference: PMID:38771880
reference_title: Cryo-EM structures elucidate the multiligand receptor nature of megalin.
supports: SUPPORT
evidence_source: IN_VITRO
snippet: >-
Genetic megalin deficiency causes Donnai-Barrow syndrome/facio-oculo-acoustico-renal syndrome in humans.
explanation: This directly links megalin deficiency to Donnai-Barrow syndrome.
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
The LRP2 gene encodes megalin (LRP-2/GP330), a large single-spanning
transmembrane glycoprotein that serves as a multiligand endocytotic
receptor and mediates the reabsorption of albumin in the proximal renal
tubule.
explanation: This supports abnormal megalin-mediated endocytosis as the proximal disease mechanism.
- reference: PMID:17632512
reference_title: "Mutations in LRP2, which encodes the multiligand receptor megalin, cause Donnai-Barrow and facio-oculo-acoustico-renal syndromes."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
LRP2 encodes megalin, a multiligand uptake receptor that regulates levels
of diverse circulating compounds.
explanation: The original molecular report supports LRP2/megalin dysfunction as the disease mechanism.
downstream:
- target: Proteinuria
description: Impaired proximal tubular reabsorption produces characteristic low-molecular-weight proteinuria.
- target: Sensorineural hearing impairment
description: Megalin-dependent sensory tissue dysfunction contributes to hearing loss.
- target: Ocular anomalies
description: Megalin dysfunction across ocular tissues contributes to characteristic eye abnormalities.
- target: High myopia
description: Ocular megalin dysfunction contributes to severe myopia.
- target: Retinal detachment
description: High myopia and retinal involvement increase retinal detachment risk.
- target: Agenesis of corpus callosum
description: Megalin-dependent developmental signaling disruption contributes to corpus callosum malformation.
- target: Intellectual disability
description: Brain developmental effects of LRP2 deficiency contribute to intellectual disability.
- target: Congenital diaphragmatic hernia
description: Embryonic megalin pathway disruption contributes to structural congenital malformations.
- target: Omphalocele
description: Embryonic megalin pathway disruption contributes to abdominal wall congenital malformations.
- target: Seizure
description: Multiorgan developmental dysfunction contributes to epilepsy in Donnai-Barrow syndrome.
- target: Global developmental delay
description: Multiorgan developmental dysfunction contributes to neurodevelopmental impairment.
- target: Autistic behavior
description: Multiorgan developmental dysfunction can contribute to autistic behavioral features.
phenotypes:
- name: Global developmental delay
category: Neurologic
diagnostic: true
description: Developmental delay is a recurrent neurodevelopmental manifestation of Donnai-Barrow syndrome.
phenotype_term:
preferred_term: Global developmental delay
term:
id: HP:0001263
label: Global developmental delay
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
We provide a clinical report of two mono-chorionic twins with LRP2-related
disease manifesting developmental delay, autistic features, seizures,
proteinuria, and sleep disorders.
explanation: This directly supports developmental delay as a clinical feature of LRP2-related disease.
- name: Sensorineural hearing impairment
category: Otolaryngologic
diagnostic: true
description: Sensorineural hearing impairment is part of the classic clinical syndrome.
phenotype_term:
preferred_term: Sensorineural hearing impairment
term:
id: HP:0000407
label: Sensorineural hearing impairment
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
LRP2 is implicated in an autosomal recessive disorder characterized by
dimorphisms, ocular anomalies, sensorineural deafness, proteinuria,
epilepsy, and intellectual disability: a clinical condition called
Donnai-Barrow syndrome (DBS) or facio-oculo-acoustico-renal (FOAR)
syndrome.
explanation: This directly supports sensorineural hearing impairment as part of the Donnai-Barrow syndrome phenotype.
- name: Ocular anomalies
category: Ophthalmologic
diagnostic: true
description: Ocular anomalies are a defining component of the FOAR syndrome phenotype.
phenotype_term:
preferred_term: Ocular anomalies
term:
id: HP:0000478
label: Abnormality of the eye
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
LRP2 is implicated in an autosomal recessive disorder characterized by
dimorphisms, ocular anomalies, sensorineural deafness, proteinuria,
epilepsy, and intellectual disability: a clinical condition called
Donnai-Barrow syndrome (DBS) or facio-oculo-acoustico-renal (FOAR)
syndrome.
explanation: This directly supports ocular anomalies as a core feature of Donnai-Barrow syndrome.
- name: Seizure
category: Neurologic
description: Seizures are part of the neurologic phenotype in Donnai-Barrow syndrome.
phenotype_term:
preferred_term: Seizure
term:
id: HP:0001250
label: Seizure
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
We provide a clinical report of two mono-chorionic twins with LRP2-related
disease manifesting developmental delay, autistic features, seizures,
proteinuria, and sleep disorders.
explanation: This directly supports seizures as a clinical feature of LRP2-related Donnai-Barrow syndrome.
- name: Autistic behavior
category: Neurologic
description: Autistic features are reported in affected individuals with Donnai-Barrow syndrome.
phenotype_term:
preferred_term: Autistic behavior
term:
id: HP:0000729
label: Autistic behavior
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
We provide a clinical report of two mono-chorionic twins with LRP2-related
disease manifesting developmental delay, autistic features, seizures,
proteinuria, and sleep disorders.
explanation: This directly supports autistic behavior as part of the neurobehavioral phenotype.
- name: Abnormal facial shape
category: Morphological
description: Facial dysmorphism is part of the classic facio-oculo-acoustico-renal syndrome presentation.
phenotype_term:
preferred_term: Abnormal facial shape
term:
id: HP:0001999
label: Abnormal facial shape
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
LRP2 is implicated in an autosomal recessive disorder characterized by
dimorphisms, ocular anomalies, sensorineural deafness, proteinuria,
epilepsy, and intellectual disability: a clinical condition called
Donnai-Barrow syndrome (DBS) or facio-oculo-acoustico-renal (FOAR)
syndrome.
explanation: This directly supports a characteristic abnormal facial shape in Donnai-Barrow syndrome.
- name: Proteinuria
category: Renal
diagnostic: true
description: Persistent tubular proteinuria is a characteristic renal feature of Donnai-Barrow syndrome.
phenotype_term:
preferred_term: Proteinuria
term:
id: HP:0000093
label: Proteinuria
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
LRP2 is implicated in an autosomal recessive disorder characterized by
dimorphisms, ocular anomalies, sensorineural deafness, proteinuria,
epilepsy, and intellectual disability: a clinical condition called
Donnai-Barrow syndrome (DBS) or facio-oculo-acoustico-renal (FOAR)
syndrome.
explanation: This directly supports proteinuria as a core renal manifestation.
- name: Agenesis of corpus callosum
category: Neurologic
diagnostic: true
description: Agenesis or hypogenesis of the corpus callosum is a common structural brain feature.
phenotype_term:
preferred_term: Agenesis of corpus callosum
term:
id: HP:0001274
label: Agenesis of corpus callosum
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Additional common features include agenesis of the corpus callosum,
sensorineural hearing loss, intellectual disability, and congenital
diaphragmatic hernia and/or omphalocele.
explanation: GeneReviews lists corpus callosum agenesis among common Donnai-Barrow syndrome features.
- name: High myopia
category: Ophthalmologic
diagnostic: true
description: Severe myopia is a characteristic ocular complication of Donnai-Barrow syndrome.
phenotype_term:
preferred_term: High myopia
term:
id: HP:0011003
label: High myopia
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Ocular complications include high myopia, retinal detachment, retinal
dystrophy, and progressive vision loss.
explanation: GeneReviews directly identifies high myopia as an ocular complication.
- name: Retinal detachment
category: Ophthalmologic
description: Retinal detachment is a clinically important ocular complication and surveillance target.
phenotype_term:
preferred_term: Retinal detachment
term:
id: HP:0000541
label: Retinal detachment
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Ocular complications include high myopia, retinal detachment, retinal
dystrophy, and progressive vision loss.
explanation: GeneReviews directly identifies retinal detachment as an ocular complication.
- name: Intellectual disability
category: Neurologic
diagnostic: true
description: Intellectual disability is part of the neurodevelopmental phenotype, distinct from early developmental delay.
phenotype_term:
preferred_term: Intellectual disability
term:
id: HP:0001249
label: Intellectual disability
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Additional common features include agenesis of the corpus callosum,
sensorineural hearing loss, intellectual disability, and congenital
diaphragmatic hernia and/or omphalocele.
explanation: GeneReviews lists intellectual disability among common Donnai-Barrow syndrome features.
- name: Congenital diaphragmatic hernia
category: Morphological
description: Congenital diaphragmatic hernia is a recurrent structural malformation in Donnai-Barrow syndrome.
phenotype_term:
preferred_term: Congenital diaphragmatic hernia
term:
id: HP:0000776
label: Congenital diaphragmatic hernia
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Additional common features include agenesis of the corpus callosum,
sensorineural hearing loss, intellectual disability, and congenital
diaphragmatic hernia and/or omphalocele.
explanation: GeneReviews lists congenital diaphragmatic hernia among common Donnai-Barrow syndrome features.
- name: Omphalocele
category: Morphological
description: Omphalocele or related umbilical hernia is a recurrent abdominal wall malformation.
phenotype_term:
preferred_term: Omphalocele
term:
id: HP:0001539
label: Omphalocele
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Additional common features include agenesis of the corpus callosum,
sensorineural hearing loss, intellectual disability, and congenital
diaphragmatic hernia and/or omphalocele.
explanation: GeneReviews lists omphalocele among common Donnai-Barrow syndrome features.
biochemical: []
genetic:
- name: LRP2
association: Causal biallelic variant
gene_term:
preferred_term: LRP2
term:
id: hgnc:6694
label: LRP2
notes: >-
Donnai-Barrow syndrome is caused by pathogenic LRP2 variants affecting the
multiligand receptor megalin.
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
By sequencing clinical exome, LRP2 candidate rare variants, c.6815G > A,
p. (Arg2272His), inherited from the mother and c.12725A > G, p.
(Asp4242Gly), inherited from the father, were identified.
explanation: This supports LRP2 as the causal gene in molecularly confirmed Donnai-Barrow syndrome.
environmental: []
treatments:
- name: Antiseizure medication therapy
description: Antiseizure medications are used for seizure management in affected individuals.
treatment_term:
preferred_term: Pharmacotherapy
term:
id: NCIT:C15986
label: Pharmacotherapy
target_phenotypes:
- preferred_term: Seizure
term:
id: HP:0001250
label: Seizure
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
The patients were under treatment with risperidone, antiseizure medications (ASMs), and supplementation of alpha-lactalbumin for self-injury and sleep disturbance.
explanation: This directly supports use of antiseizure medication in Donnai-Barrow syndrome management.
- name: Ophthalmologic surveillance and retinal detachment prevention
description: >-
Ophthalmologic monitoring, corrective lenses for myopia, and preventive
retinal detachment treatment are key eye-management measures.
treatment_term:
preferred_term: eye examination
term:
id: MAXO:0001155
label: eye examination
target_phenotypes:
- preferred_term: High myopia
term:
id: HP:0011003
label: High myopia
- preferred_term: Retinal detachment
term:
id: HP:0000541
label: Retinal detachment
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgical repair of diaphragmatic hernia and/or omphalocele; corrective
lenses for myopia; preventive treatments for retinal detachment; hearing
aids and/or cochlear implants for hearing loss; antiepileptic drugs for
seizures; supplementation as needed for low serum vitamins A and D;
education tailored to degree of intellectual, visual, and hearing
abilities.
explanation: GeneReviews recommends corrective lenses and retinal detachment prevention as management.
- name: Hearing rehabilitation
description: Hearing aids and cochlear implantation are used for hearing loss management when clinically appropriate.
treatment_term:
preferred_term: hearing aid usage
term:
id: MAXO:0009030
label: hearing aid usage
target_phenotypes:
- preferred_term: Sensorineural hearing impairment
term:
id: HP:0000407
label: Sensorineural hearing impairment
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgical repair of diaphragmatic hernia and/or omphalocele; corrective
lenses for myopia; preventive treatments for retinal detachment; hearing
aids and/or cochlear implants for hearing loss; antiepileptic drugs for
seizures; supplementation as needed for low serum vitamins A and D;
education tailored to degree of intellectual, visual, and hearing
abilities.
explanation: GeneReviews supports hearing aids and cochlear implants for hearing loss management.
- name: Cochlear implantation
description: Cochlear implantation may be considered for severe or profound sensorineural hearing loss.
treatment_term:
preferred_term: cochlear device implantation
term:
id: MAXO:0009025
label: cochlear device implantation
target_phenotypes:
- preferred_term: Sensorineural hearing impairment
term:
id: HP:0000407
label: Sensorineural hearing impairment
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgical repair of diaphragmatic hernia and/or omphalocele; corrective
lenses for myopia; preventive treatments for retinal detachment; hearing
aids and/or cochlear implants for hearing loss; antiepileptic drugs for
seizures; supplementation as needed for low serum vitamins A and D;
education tailored to degree of intellectual, visual, and hearing
abilities.
explanation: GeneReviews supports cochlear implants for hearing loss management.
- name: Surgical repair of diaphragmatic hernia or omphalocele
description: Structural congenital defects are managed surgically when present.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
target_phenotypes:
- preferred_term: Congenital diaphragmatic hernia
term:
id: HP:0000776
label: Congenital diaphragmatic hernia
- preferred_term: Omphalocele
term:
id: HP:0001539
label: Omphalocele
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgical repair of diaphragmatic hernia and/or omphalocele; corrective
lenses for myopia; preventive treatments for retinal detachment; hearing
aids and/or cochlear implants for hearing loss; antiepileptic drugs for
seizures; supplementation as needed for low serum vitamins A and D;
education tailored to degree of intellectual, visual, and hearing
abilities.
explanation: GeneReviews recommends surgical repair for diaphragmatic hernia and omphalocele.
- name: Renal and fat-soluble vitamin monitoring
description: >-
Kidney function, urinalysis, and serum vitamins A and D should be monitored
because megalin dysfunction causes low-molecular-weight proteinuria.
treatment_term:
preferred_term: clinical monitoring
term:
id: MAXO:0000487
label: clinical assessment
target_phenotypes:
- preferred_term: Proteinuria
term:
id: HP:0000093
label: Proteinuria
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Ophthalmologic surveillance to monitor for retinal detachment; serial
audiologic examinations; serial measurement of kidney function including
blood urea nitrogen and serum creatinine concentrations, urinalysis, and
serum vitamin A and D; monitor developmental progress and educational
needs.
explanation: GeneReviews supports renal, urinalysis, and vitamin surveillance.
- name: Vitamin D supplementation
description: Vitamin D supplementation is used when serum vitamin D is low.
treatment_term:
preferred_term: vitamin D supplementation
term:
id: MAXO:0000058
label: pharmacotherapy
therapeutic_agent:
- preferred_term: vitamin D
term:
id: CHEBI:27300
label: vitamin D
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgical repair of diaphragmatic hernia and/or omphalocele; corrective
lenses for myopia; preventive treatments for retinal detachment; hearing
aids and/or cochlear implants for hearing loss; antiepileptic drugs for
seizures; supplementation as needed for low serum vitamins A and D;
education tailored to degree of intellectual, visual, and hearing
abilities.
explanation: GeneReviews supports supplementation for low serum vitamins A and D.
- name: Developmental and educational support
description: >-
Developmental monitoring, educational planning, and support should be
tailored to intellectual, visual, and hearing abilities.
treatment_term:
preferred_term: supportive care
term:
id: MAXO:0000950
label: supportive care
target_phenotypes:
- preferred_term: Global developmental delay
term:
id: HP:0001263
label: Global developmental delay
- preferred_term: Intellectual disability
term:
id: HP:0001249
label: Intellectual disability
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Surgical repair of diaphragmatic hernia and/or omphalocele; corrective
lenses for myopia; preventive treatments for retinal detachment; hearing
aids and/or cochlear implants for hearing loss; antiepileptic drugs for
seizures; supplementation as needed for low serum vitamins A and D;
education tailored to degree of intellectual, visual, and hearing
abilities.
explanation: GeneReviews recommends education tailored to intellectual, visual, and hearing abilities.
- name: Genetic counseling
description: >-
Counseling addresses autosomal recessive recurrence risk, carrier testing,
and reproductive options when familial variants are known.
treatment_term:
preferred_term: genetic counseling
term:
id: MAXO:0000079
label: genetic counseling
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
When both parents are known to be carriers of a pathogenic variant, each
sib of an affected individual has a 25% chance of being affected, a 50%
chance of being an asymptomatic carrier, and a 25% chance of being
unaffected and not a carrier.
explanation: GeneReviews provides recurrence-risk information that underpins genetic counseling.
diagnosis:
- name: LRP2 molecular genetic testing
description: Molecular confirmation of biallelic pathogenic LRP2 variants establishes the diagnosis.
presence: Identification of biallelic pathogenic LRP2 variants confirms the diagnosis.
diagnosis_term:
preferred_term: molecular genetic testing
term:
id: MAXO:0000533
label: molecular genetic testing
qualifiers:
- predicate:
preferred_term: has participant
term:
id: RO:0000057
label: has participant
value:
preferred_term: LRP2
term:
id: hgnc:6694
label: LRP2
evidence:
- reference: PMID:37810913
reference_title: >-
Behavioral Phenotype, Electroclinical Features, and Treatment Options in
Twins with Lrp2 Candidate Variants (Donnay-Barrow/Foar Syndrome).
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
By sequencing clinical exome, LRP2 candidate rare variants, c.6815G > A,
p. (Arg2272His), inherited from the mother and c.12725A > G, p.
(Asp4242Gly), inherited from the father, were identified.
explanation: This directly supports molecular genetic testing as the confirmatory diagnostic procedure.
- name: Low-molecular-weight proteinuria testing
description: >-
Urine laboratory evaluation for a distinctive low-molecular-weight proteinuria
pattern is a key biochemical diagnostic clue.
presence: Low-molecular-weight proteinuria supports the diagnosis in the right clinical context.
diagnosis_term:
preferred_term: clinical laboratory procedure
term:
id: MAXO:0000006
label: clinical laboratory procedure
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
The diagnosis of DBS is established in a proband with: the characteristic
clinical features and a distinctive pattern of low-molecular-weight
proteinuria; and/or biallelic pathogenic variants in LRP2 identified by
molecular genetic testing.
explanation: GeneReviews identifies low-molecular-weight proteinuria as a diagnostic pattern.
- name: Brain MRI
description: Brain MRI can document agenesis or hypogenesis of the corpus callosum.
presence: Corpus callosum agenesis or hypogenesis supports the clinical diagnosis.
diagnosis_term:
preferred_term: MRI of the brain
term:
id: MAXO:0000427
label: MRI of the brain
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Additional common features include agenesis of the corpus callosum,
sensorineural hearing loss, intellectual disability, and congenital
diaphragmatic hernia and/or omphalocele.
explanation: GeneReviews supports corpus callosum agenesis as a common diagnostic feature detectable by brain MRI.
- name: Ophthalmologic examination
description: Ophthalmologic assessment evaluates high myopia, retinal dystrophy, and retinal detachment risk.
presence: High myopia or retinal involvement supports the syndrome diagnosis and guides management.
diagnosis_term:
preferred_term: eye examination
term:
id: MAXO:0001155
label: eye examination
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Ocular complications include high myopia, retinal detachment, retinal
dystrophy, and progressive vision loss.
explanation: GeneReviews supports ophthalmologic evaluation for the characteristic ocular phenotype.
- name: Audiologic evaluation
description: Audiologic assessment evaluates sensorineural hearing impairment, often presenting in infancy or childhood.
presence: Sensorineural hearing loss supports the clinical diagnosis and guides hearing rehabilitation.
diagnosis_term:
preferred_term: audiologic evaluation
term:
id: MAXO:0000487
label: clinical assessment
evidence:
- reference: PMID:20301732
reference_title: "Donnai-Barrow Syndrome."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Additional common features include agenesis of the corpus callosum,
sensorineural hearing loss, intellectual disability, and congenital
diaphragmatic hernia and/or omphalocele.
explanation: GeneReviews lists sensorineural hearing loss among common Donnai-Barrow syndrome features.
differential_diagnoses: []
clinical_trials: []
references:
- reference: PMID:20301732
title: "Donnai-Barrow Syndrome."
tags:
- GeneReviews
findings: []
- reference: url:https://www.ncbi.nlm.nih.gov/books/NBK1878/
title: "Donnai-Barrow Syndrome - GeneReviews® - NCBI Bookshelf"
tags:
- GeneReviews
findings: []
- reference: PMID:17632512
title: "Mutations in LRP2, which encodes the multiligand receptor megalin, cause Donnai-Barrow and facio-oculo-acoustico-renal syndromes."
findings: []
datasets: []
notes: >-
Asta deep research was completed for this disorder. Final curation prioritized
disease-specific LRP2 case and megalin mechanism papers with exact cached
abstract support.
This report is retrieval-only and is generated directly from Asta results.
search_papers_by_relevance with snippet_search.