SSR4-congenital disorder of glycosylation
Findings
No curated finding names SSR4-congenital disorder of glycosylation yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
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 SSR4(Xq28).
Definition from the Mondo Disease Ontology (MONDO:0010490), read 2026-09-29. CC BY 4.0.
- Inheritance
- X-linked recessive inheritance
HPO, annotations 2026-09-02
Features
29 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Abnormal facial shapeHPOHP:0001999
- Obligate (100% of cases)
- Generalized hypotoniaHPOHP:0001290
- Obligate (100% of cases)
- Global developmental delayHPOHP:0001263
- 9 of 9 reported patients
- Obligate (100% of cases)
- HypotoniaHPOHP:0001252
- 9 of 9 reported patients
- Intellectual disabilityHPOHP:0001249
- 9 of 9 reported patients
- Obligate (100% of cases)
- Microcephaly
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- SSR4HGNC:11326
- Strong · Labcorp Genetics (formerly Invitae) · X-linked · 2022
- Strong · PanelApp Australia · X-linked · 2025
- Moderate · Ambry Genetics · X-linked · 2018
- Supportive · Orphanet · X-linked · 2021
Where it sits
Other names
8 names
Resolves to: SSR4-congenital disorder of glycosylation
- Also called
- carbohydrate deficient glycoprotein syndrome type IyCDG syndrome type IyCDG-IyCDG1Ycongenital disorder of glycosylation type 1ycongenital disorder of glycosylation type Iycongenital disorder of glycosylation, type Iy, X-linked recessiveSSR4-CDG