raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:464738

Basel-Vanagaite-Smirin-Yosef syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Antenatal, Infancy, Neonatal
Status
active

A rare, genetic intellectual disability syndrome characterized by severe global developmental delay with intellectual disability, microcephaly, growth retardation, ocular defects such as congenital cataract, and nevus flammeus simplex on the forehead. Cardiac, urogenital, and skeletal abnormalities, as well as seizures are present in most patients. Dysmorphic craniofacial features include sparse hair, downslanting palpebral fissures, hypertelorism, broad and overhanging nasal tip and short philtrum, among others.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enBasel-Vanagaite-Smirin-Yosef syndrome
frSyndrome de Basel-Vanagaite-Smirin-Yosef
deBasel-Vanagaite-Smirin-Yosef-Syndrom
esSíndrome de Basel-Vanagaite-Smirin-Yosef
itSindrome di Basel-Vanagaite-Smirin-Yosef
nlSyndroom van Basel-Vanagaite-Smirin-Yosef
ptSíndrome Basel-Vanagaite-Smirin-Yosef
plZespół Basel-Vanagaite i Smirin-Yosef
csSyndrom zahrnující vrozenou kataraktu, mikrocefalii, nevus flammeus simplex a těžkou mentální retardaci
ukСиндром Базеля-Ванагайта-Сміріна-Йосефа
zh先天性白内障-小头畸形-单纯性痣-严重智力障碍综合征
trDoğumsal katarakt-mikrosefali-nevüs flammeus simpleks-ağır zihinsel yetersizlik sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM616449Evalidated
ICD-10Q87.8NTBTattributedvalidated
MONDO0014643Evalidated
UMLSC4225323Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (4):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
MED25Disease-causing germline mutation(s) inAssessedHGNC:28845ENSG0000010497361019719q13.33mediator complex subunit 2525792360[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families22 casesWorldwideCase(s)Validated25792360[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_25792360[PMID]

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

69 annotations · validated 2020-01-03
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002540Inability to walk
HP:0007413Nevus flammeus of the forehead
HP:0011344Severe global developmental delay
Frequent (79-30%)
HP:0001344Absent speech
HP:0000519Developmental cataract
HP:0000494Downslanted palpebral fissures
HP:0000286Epicanthus
HP:0000232Everted lower lip vermilion
HP:0002263Exaggerated cupid's bow
HP:0000348High forehead
HP:0000316Hypertelorism
HP:0000047Hypospadias
HP:0001252Hypotonia
HP:0000303Mandibular prognathia
HP:0000252Microcephaly
HP:0000482Microcornea
HP:0002465Poor speech
HP:0005274Prominent nasal tip
HP:0000508Ptosis
HP:0001250Seizure
HP:0000322Short philtrum
HP:0045075Sparse eyebrow
HP:0002209Sparse scalp hair
HP:0010804Tented upper lip vermilion
Occasional (29-5%)
HP:00046912-3 toe syndactyly
HP:0001181Adducted thumb
HP:0001274Agenesis of corpus callosum
HP:0000718Aggressive behavior
HP:0000646Amblyopia
HP:0000463Anteverted nares
HP:0001631Atrial septal defect
HP:0010186Broad distal phalanx of the toes
HP:0002389Cavum septum pellucidum
HP:0002059Cerebral atrophy
HP:0001081Cholelithiasis
HP:0000175Cleft palate
HP:0030084Clinodactyly
HP:0002019Constipation
HP:0009471Contracture of the proximal interphalangeal joint of the 3rd finger
HP:0009468Deviation of the 2nd finger
HP:0007082Dilated third ventricle
HP:0006101Finger syndactyly
HP:0000221Furrowed tongue
HP:0001288Gait disturbance
HP:0008499High hypermetropia
HP:0002705High, narrow palate
HP:0000126Hydronephrosis
HP:0002079Hypoplasia of the corpus callosum
HP:0000023Inguinal hernia
HP:0002342Intellectual disability, moderate
HP:0002808Kyphosis
HP:0006956Lateral ventricle dilatation
HP:0011670Left superior vena cava draining to coronary sinus
HP:0000369Low-set ears
HP:0032077Male urethral meatus stenosis
HP:0000568Microphthalmia
HP:0010557Overlapping fingers
HP:0001845Overlapping toe
HP:0000768Pectus carinatum
HP:0001761Pes cavus
HP:0002092Pulmonary arterial hypertension
HP:0006532Recurrent pneumonia
HP:0001315Reduced tendon reflexes
HP:0000278Retrognathia
HP:0002650Scoliosis
HP:0000954Single transverse palmar crease
HP:0001257Spasticity
HP:0000486Strabismus
HP:0001629Ventricular septal defect

Run the differential on the 3 obligate / very frequent terms

Annotation source: 25792360[PMID]_25527630[PMID]

7

Sources for this card