SLC35A5
Chr 3solute carrier family 35 member A5
This gene encodes a transmembrane antiporter that transports UDP-sugars including UDP-glucuronate, UDP-GlcNAc, and UDP-GalNAc from the cytosol into the Golgi lumen for glycosylation processes. Mutations cause congenital disorder of glycosylation type IIc (CDG-IIc), characterized by intellectual disability, seizures, and distinctive facial features with autosomal recessive inheritance. The condition typically presents in early childhood with developmental delays and neurological manifestations.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Highly tolerant — LoF variants common in population
Tolerant to missense variation
This gene has evidence for multiple mechanisms of pathogenicity (dominant-negative and gain-of-function). Both the Badonyi & Marsh prediction and the broader genomic evidence point to dominant-negative as the predominant mechanism. Different variants in this gene may act through different mechanisms — interpret in context of the specific variant.
Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.
Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.
ClinVar Variant Classifications
94 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | 0 | 0 | 25 | 0 | 25 |
Likely Pathogenic | 0 | 0 | 1 | 0 | 1 |
VUS | 1 | 50 | 5 | 0 | 56 |
Likely Benign | 0 | 3 | 0 | 0 | 3 |
Benign | 0 | 0 | 0 | 0 | 0 |
| Total | 1 | 53 | 31 | 0 | 85 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
SLC35A5 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
3D Protein StructureAlphaFold
External Resources
Links to major genomics databases and tools
Clinical Trials
Active and recruiting trials from ClinicalTrials.gov
No active trials found for this gene.
Search ClinicalTrials.gov →External Resources
Links to major genomics databases and tools