FAM117B
Chr 2family with sequence similarity 117 member B
Also known as: ALS2CR13
FAM117B encodes a protein of unknown function that is highly constrained against loss-of-function variants (LOEUF 0.662). Mutations cause autosomal recessive renal tubular dysgenesis, a severe developmental disorder of the kidneys characterized by absent or poorly developed proximal tubules, leading to oligohydramnios, growth restriction, and often perinatal lethality.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Typical tolerance to LoF variation
Mild missense constraint
This gene has evidence for multiple mechanisms of pathogenicity (gain-of-function and dominant-negative). Both the Badonyi & Marsh prediction and the broader genomic evidence point to gain-of-function 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
126 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 | 27 | 0 | 27 |
Likely Pathogenic | 0 | 0 | 1 | 0 | 1 |
VUS | 0 | 74 | 5 | 0 | 79 |
Likely Benign | 0 | 1 | 0 | 0 | 1 |
Benign | 0 | 0 | 0 | 0 | 0 |
| Total | 0 | 75 | 33 | 0 | 108 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
FAM117B · 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