TTC4
Chr 1tetratricopeptide repeat domain 4
Also known as: CNS1
The protein functions as a co-chaperone that recruits Hsp90 and Hsp70 molecular chaperones to nascent polypeptides, facilitating proper protein folding and supporting cellular translation through interaction with elongation factor eEF2. Mutations in TTC4 cause autosomal recessive intellectual disability with microcephaly, short stature, and facial dysmorphism. The gene shows tolerance to loss-of-function variants, consistent with the recessive inheritance pattern observed in affected individuals.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Typical tolerance to LoF variation
Mild missense constraint
The highest-scoring mechanism for this gene is dominant-negative.
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
0 submitted variants in ClinVar
Protein Context — Lollipop Plot
TTC4 · 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