raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:502434

STAG1-related intellectual disability-facial dysmorphism-gastroesophageal reflux syndrome

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

A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by global developmental delay, variable degrees of intellectual disability, and facial dysmorphism (including high nasal bridge, deep-set eyes, and wide mouth), often associated with feeding difficulties and/or gastroesophageal reflux. Additional reported manifestations are seizures, hypotonia, autistic features, and joint laxity. Brain imaging may show non-specific features (such as cerebral atrophy).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enSTAG1-related intellectual disability-facial dysmorphism-gastroesophageal reflux syndrome
frSyndrome de déficience intellectuelle-dysmorphie faciale-reflux gastro-oesophagien associé à STAG1
deIntelligenzminderung-Gesichtsdysmorphie-gastroösophagealer Reflux-Syndrom, STAG1-assoziiert
esSíndrome de discapacidad intelectual-dismorfia facial-reflujo gastroesofágico asociado a STAG1
itSindrome disabilità intellettiva - dismorfismi facciali - reflusso gastroesofageo correlata a STAG1
nlSTAG1-gerelateerde intellectuele achterstand - faciale dysmorfie - gastro-oesofageale reflux-syndroom
ptSíndrome de perturbação do desenvolvimento intelectual-dismorfia facial-refluxo gastroesofágico STAG1-relacionado
plZespół niepełnosprawności intelektualnej, dysmorfii twarzy i refluksu żołądkowo-przełykowego związany z STAG1
csSTAG1-vázaný syndrom zahrnující mentální retardaci, faciální dysmorfismus a gastroezofageální reflux
ukSTAG1-повязаний синдром інтелектуальної недостатності-дисморфізму обличчя-гастроезофагеального рефлюксу
zhSTAG1基因相关智力障碍-面部畸形-胃食管反流综合征
trSTAG1-ilişkili zihinsel yetersizlik-fasiyal dismorfizm-gastroözofageal reflü sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM617635Evalidated
ICD-10Q87.0NTBTattributedvalidated
MONDO0030912Evalidated
UMLSC5568769Evalidated

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 (2):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
STAG1Disease-causing germline mutation(s) inAssessedHGNC:11354ENSG000001180076043583q22.3STAG1 cohesin complex component28119487[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families17 casesWorldwideCase(s)Validated28119487[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_28119487[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

38 annotations · validated 2020-01-20
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000490Deeply set eye
HP:0001263Global developmental delay
HP:0001249Intellectual disability
Frequent (79-30%)
HP:0000729Autistic behavior
HP:0000028Cryptorchidism
HP:0011968Feeding difficulties
HP:0002020Gastroesophageal reflux
HP:0000426Prominent nasal bridge
HP:0001250Seizure
HP:0045074Thin eyebrow
HP:0000154Wide mouth
Occasional (29-5%)
HP:00046912-3 toe syndactyly
HP:0001999Abnormal facial shape
HP:0002817Abnormality of the upper limb
HP:0012444Brain atrophy
HP:0004209Clinodactyly of the 5th finger
HP:0000965Cutis marmorata
HP:0200134Epileptic encephalopathy
HP:0001508Failure to thrive
HP:0000218High palate
HP:0000085Horseshoe kidney
HP:0000050Hypoplastic male external genitalia
HP:0001252Hypotonia
HP:0010864Intellectual disability, severe
HP:0001511Intrauterine growth retardation
HP:0001382Joint hypermobility
HP:0001377Limited elbow extension
HP:0000527Long eyelashes
HP:0000369Low-set ears
HP:0000252Microcephaly
HP:0000347Micrognathia
HP:0000202Orofacial cleft
HP:0002650Scoliosis
HP:0004322Short stature
HP:0000954Single transverse palmar crease
HP:0000486Strabismus
HP:0000664Synophrys
HP:0001566Widely-spaced maxillary central incisors

Run the differential on the 3 obligate / very frequent terms

Annotation source: 28119487[PMID]_30158690[PMID]

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Sources for this card