raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:370927

SSR4-CDG

Synonyms: CDG syndrome type Iy · CDG-Iy · CDG1Y · Carbohydrate deficient glycoprotein syndrome type Iy · Congenital disorder of glycosylation type 1y · Congenital disorder of glycosylation type Iy

Type
Disease
Group
Disorder
Inheritance
X-linked recessive
Age of onset
Infancy, Neonatal
Status
active

SSR4-CDG is a form of congenital disorders of N-linked glycosylation characterized by neurologic abnormalities (global developmental delay in language, social skills and fine and gross motor development, intellectual disability, hypotonia, microcephaly, seizures/epilepsy), facial dysmorphism (deep set eyes, large ears, hypoplastic vermillion of upper lip, large mouth with widely spaced teeth), feeding problems often due to chewing difficulties and aversion to food with certain textures, failure to thrive, gastrointestinal abnormalities (reflux or vomiting) and strabismus. The disease is caused by mutations in the gene <i> SSR4</i> (Xq28).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enSSR4-CDGCDG syndrome type Iy · CDG-Iy · CDG1Y · Carbohydrate deficient glycoprotein syndrome type Iy · Congenital disorder of glycosylation type 1y · Congenital disorder of glycosylation type Iy
frSSR4-CDGAnomalie congénitale de la glycosylation type 1y · Anomalie congénitale de la glycosylation type Iy · CDG-Iy · CDG1Y · Syndrome CDG type Iy · Syndrome des glycoprotéines déficientes en hydrates de carbone type Iy
deSSR4-CDGCDG (Congenital Disorder of Glycosylation) Typ 1y · CDG-Iy · CDG-Syndrom Typ Iy · CDG1Y · Kohlenhydrat-defizientes Glykoprotein-Syndrom Typ Iy · Kongenitaler Defekt der Glycoproteinbiosynthese Typ Iy
esSSR4-CDGTrastorno congénito de la glicosilación tipo Iy · CDG-Iy · CDG1Y · Síndrome CDG tipo Iy · Síndrome de glicoproteínas deficientes en carbohidratos tipo Iy · Trastorno congénito de la glicosilación tipo 1y
itSSR4-CDGCDG-Iy · CDG1Y · Disturbo congenito della glicosilazione, tipo 1y · Disturbo congenito della glicosilazione, tipo Iy · Sindrome CDG, tipo Iy · Sindrome della glicoproteine carenti in carboidrati, tipo Iy
nlSSR4-CDGCDG-Iy · CDG-syndroom type Iy · CDG1Y · Congenitale defecten van de glycosylering type 1y · Congenitale defecten van de glycosylering type Iy · Congenitale glycosylatiestoornis type 1y · Congenitale glycosylatiestoornis type Iy · Koolhydraatdeficiënt glycoproteïne-syndroom type Iy
ptGlicogenose tipo IyCDG-Iy · CDG1Y · Doença congénita da glicosilação tipo 1y · Doença congénita da glicosilação tipo Iy · Síndrome CDG Iy · Síndrome de glicoproteína deficiente em carbohidratos tipo Iy
plSSR4-CDGCDG1Y · CDG-Iy · Wrodzone zaburzenie glikozylacji typu 1y · Wrodzone zaburzenie glikozylacji typu Iy · Zespół CDG typu Iy · Zespół obniżonej glikozylacji glikoprotein typu Iy
csSSR4-CDGCDG syndrom, typ Iy · CDG-Iy · CDG1Y · Carbohydrate deficient glycoprotein syndrom type Iy · Vrozená porucha glykosylace, typ 1y · Vrozená porucha glykosylace, typ Iy · Glykoproteinový syndrom deficitu sacharidů typu Iy
ukSSR4-CDGВуглеводно-дефіцитний глікопротеїновий синдром типу Iy · Синдром CDG, тип Iy · CDG1Y · CDG-ІІ · Вроджене порушення глікозилювання типу 1y · Вроджене порушення глікозилювання типу Iy
zhSSR4基因型先天性糖基化障碍缺糖基糖蛋白综合征Iy型
trSSR4-CDGCDG1Y · CDG-Iy · CDG sendromu tip Iy · Glikozilasyon Tip 1y'nin doğumsal bozukluğu · Glikozilasyon tipi Iy'nin doğumsal bozukluğu · Karbonhidrat eksikliği olan glikoprotein sendromu tip Iy

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300934Evalidated
ICD-10E77.8NTBTattributedvalidated
ICD-115C54.0NTBTattributedvalidated
MONDO0010490Evalidated
UMLSC4012395Evalidated
GARD12405Evalidated

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
SSR4Disease-causing germline mutation(s) inAssessedHGNC:11326ENSG00000180879300090Xq28signal sequence receptor subunit 424218363[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families9 casesWorldwideCase(s)Validated26264460[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_26264460[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

28 annotations · validated 2017-02-09
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0001999Abnormal facial shape
HP:0001290Generalized hypotonia
HP:0001263Global developmental delay
HP:0001249Intellectual disability
HP:0000252Microcephaly
Very frequent (99-80%)
HP:0011024Abnormality of the gastrointestinal tract
HP:0011339Abnormality of upper lip vermillion
HP:0000490Deeply set eye
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0002020Gastroesophageal reflux
HP:0000400Macrotia
HP:0000486Strabismus
HP:0002013Vomiting
HP:0000154Wide mouth
HP:0000687Widely spaced teeth
Frequent (79-30%)
HP:0001250Seizure
Occasional (29-5%)
HP:0002518Abnormal periventricular white matter morphology
HP:0001928Abnormality of coagulation
HP:0001626Abnormality of the cardiovascular system
HP:0000924Abnormality of the skeletal system
HP:0001331Absent septum pellucidum
HP:0000085Horseshoe kidney
HP:0002079Hypoplasia of the corpus callosum
HP:0001373Joint dislocation
HP:0002650Scoliosis
Very rare (<4-1%)
HP:0003256Abnormality of the coagulation cascade
HP:0001643Patent ductus arteriosus

Run the differential on the 12 obligate / very frequent terms

Annotation source: 26264460[PMID]

7

Sources for this card