TBC1D26
Chr 17TBC1 domain family member 26
TBC1D26 encodes a protein that acts as a GTPase-activating protein for Rab family proteins, which regulate intracellular membrane trafficking. Mutations cause autosomal recessive developmental and epileptic encephalopathy with movement abnormalities. The gene shows tolerance to loss-of-function variants (LOEUF 1.086), consistent with recessive inheritance where heterozygous carriers are typically unaffected.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Highly tolerant — LoF variants common in population
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
65 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 | 16 | 0 | 16 |
Likely Pathogenic | 0 | 0 | 0 | 0 | 0 |
VUS | 1 | 25 | 4 | 0 | 30 |
Likely Benign | 0 | 5 | 3 | 1 | 9 |
Benign | 0 | 0 | 3 | 0 | 3 |
| Total | 1 | 30 | 26 | 1 | 58 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
TBC1D26 · 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 →No open access results found
External Resources
Links to major genomics databases and tools