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COG5-CDG is an extremely rare form of CDG syndrome characterized clinically in the single reported case to date by moderate mental retardation with slow and inarticulate speech, truncal ataxia, and mild hypotonia.
Features include always present findings: Low muscle tone (hypotonia) and Intellectual disability; and very common findings: Delayed speech and language development, Motor delay, and Floppy infant. 51 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 14 | Brain shrinkage (cerebral atrophy), Truncal ataxia, Delayed speech and language development |
COG5 encodes component of oligomeric golgi complex 5 (860 aa). Required for normal Golgi function Highest expression in Cervix Ectocervix (28.5 TPM) and Cervix Endocervix (26.0 TPM).
COG5-congenital disorder of glycosylation is caused by mutations in the COG5 gene on chromosome 7.
COG5 is classified as a druggable target with score 0.0.
Genetic testing for COG5 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 2 always present features, 3 very common features, 6 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for COG5-congenital disorder of glycosylation.
5 publications have been identified in PubMed for COG5-congenital disorder of glycosylation. Research spans Case Report / Case Series (60%), Basic Science / Preclinical (20%), and Epidemiology / Natural History (20%).
Yang Q (2026). [PMID: 41952427](https://pubmed.ncbi.nlm.nih.gov/41952427/). *Mol Genet Genomic Med*. [Case Report / Case Series]
Zhou Y (2026). [PMID: 41824529](https://pubmed.ncbi.nlm.nih.gov/41824529/). *PLoS Genet*. [Basic Science / Preclinical]
Zhao P (2025). [PMID: 41437099](https://pubmed.ncbi.nlm.nih.gov/41437099/). *Orphanet J Rare Dis*. [Epidemiology / Natural History]
Khabou B (2024). [PMID: 38987656](https://pubmed.ncbi.nlm.nih.gov/38987656/). *J Hum Genet*. [Case Report / Case Series]
Wang YC (2024). [PMID: 38559322](https://pubmed.ncbi.nlm.nih.gov/38559322/). *Mol Genet Metab Rep*. [Case Report / Case Series]
Data assembled from 7 of 12 sources · Last updated Sep 21, 2026, 4:52 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about COG5-congenital disorder of glycosylation
Muscles |
8 |
Brain shrinkage (cerebral atrophy), Shrinkage of the cerebellum (cerebellar atrophy), Low muscle tone (hypotonia) |
Digestive system | 4 | Hepatosplenomegaly, Enlarged liver (hepatomegaly), Elevated circulating hepatic transaminase concentration |
Arms and legs | 3 | Joint contracture of the hand, Finger clinodactyly, Camptodactyly of finger |
Head and neck | 2 | Microcephaly, High palate |
Ears | 2 | Hearing loss (hearing impairment), Inner ear hearing loss (sensorineural hearing impairment) |
Growth and development | 2 | Short stature, Intrauterine growth retardation |
Eyes | 2 | Strabismus, Cerebral visual impairment |
Kidneys and urinary system | 1 | Urinary incontinence |
Lab test results | 1 | Elevated circulating hepatic transaminase concentration |
Bones and joints | 1 | Joint contracture of the hand |
Skin | 1 | Premature skin wrinkling |