UNC45B
Chr 17ADARunc-45 myosin chaperone B
Also known as: CMYA4, CTRCT43, MFM11, SMUNC45, UNC-45B, UNC45
The protein acts as a co-chaperone for HSP90 and is required for proper folding of the myosin motor domain, playing a crucial role in sarcomere formation during muscle cell development and normal early lens development. Mutations cause myofibrillar myopathy 11 and cataract 43, affecting both striated muscle and lens tissue. The gene shows both autosomal dominant and autosomal recessive inheritance patterns and is highly intolerant to loss-of-function variants.
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Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Typical tolerance to LoF variation
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
414 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 | 3 | 8 | 0 | 11 |
Likely Pathogenic | 0 | 2 | 1 | 0 | 3 |
VUS | 3 | 205 | 11 | 1 | 220 |
Likely Benign | 0 | 10 | 55 | 35 | 100 |
Benign | 0 | 6 | 53 | 11 | 70 |
Conflicting | — | 5 | |||
| Total | 3 | 226 | 128 | 47 | 409 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
UNC45B · 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