MRTFB p.Arg255Trp
c.763C>T · rs148936000 · VCV3210276
Uncertain significance
Single submitter
Classification
Uncertain significance
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.024%, afr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| REVEL | 0.177 | moderately benign-leaning |
|---|---|---|
| Splicing | ||
| SpliceAI | <0.2 | no splice effect predicted · four deltas, not one · how we know |
| Constraint at this position | ||
| Conservation | phyloP 1.6 | GERP -3.3, phastCons 0.41 |
| Regional constraint | o/e 1.01 | unconstrained · MANE · 43 kb · p 0.71 · regional, not allelic |
| Overall | ||
| CADD | 20.5 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.024%
African / African-American · 18/74,926 alleles
Filtering AF
0.0155%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0128%
Overall
0.00217%
35/1,614,072 alleles · ultra-rare
exomes 26/1,461,864 · genomes 9/152,208 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.024% | 4,163 |
| Admixed American | 0.005% | 20,003 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,488 |
| South Asian | 0.0011% | 91,084 |
| European (non-Finnish) | 0.00102% | 98,335 |
Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.
Variant & gene context
- Gene
- MRTFB
- Protein
- p.Arg255Trp
- Coding
- c.763C>T
- MANE Select
- NM_001308142
- dbSNP
- rs148936000
- Type
- single nucleotide variant
- Location
- chr16:14234215 (GRCh38)
- Gene constraint
- LOEUF 0.351 · pLI 1.00 (gnomAD)
- Structure
- AlphaFold pLDDT 53.38
- Residue 255
- the 'disordered' region
Similar variants
- MRTFB p.Asn47= Benign/Likely benign ★★ same type
- MRTFB p.Ser643= Benign ★★ same type
- MRTFB p.Thr9= Benign ★★ same type
- MRTFB p.Ala91Pro Pathogenic ★ same type
- MRTFB p.Leu160Pro Likely pathogenic ★ same type
- MRTFB c.693+1G>T Uncertain significance ★ same type
- MRTFB p.Ala1080Val Uncertain significance ★ same type
- MRTFB p.Ala138Glu Uncertain significance ★ same type
Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →
Cite Sugi Variant
Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/mrtfb-p-arg255trp (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown