Is MRTFA p.Leu443Val (c.1327C>G) pathogenic?

MRTFA p.Leu443Val (c.1327C>G) is classified Uncertain significance in MRTFA (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-16). AlphaMissense: likely benign (0.2854); Very rare (popmax 0.00833%, amr).

How common is MRTFA p.Leu443Val (c.1327C>G) in the general population?

MRTFA p.Leu443Val (c.1327C>G) is very rare (popmax 0.00833%, amr) (gnomAD).

What do computational predictors say about MRTFA p.Leu443Val (c.1327C>G)?

AlphaMissense predicts likely benign (score 0.2854) — an in-silico prediction, not a clinical call.

MRTFA p.Leu443Val

c.1327C>G · rs749255930 · VCV2132317

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2854 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00833%, amr)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.2854	likely benign
REVEL	0.193	benign-leaning
SaProt	LLR -10.69	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 7.6	GERP 2.4, phastCons 1
Regional constraint	o/e 1.06	unconstrained · MANE · 13 kb · p 0.043 · regional, not allelic
Overall
CADD	24.7	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM L343V vs ClinVar L443V) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00833% Admixed American · 5/60,016 alleles

Filtering AF 0.00323% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00206%

Overall 0.00031% 5/1,613,648 alleles · very rare exomes 5/1,461,268 · genomes 0/152,380 · joint denominator

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: MRTFA
Protein: p.Leu443Val
Coding: c.1327C>G
MANE Select: NM_020831
dbSNP: rs749255930
Type: single nucleotide variant
Location: chr22:40420431 (GRCh38)
Gene constraint: LOEUF 0.389 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 56.59 · 2 PDB
Residue 343 UniProt numbering: the 'disordered' region

Full MRTFA gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

MRTFA p.Ala352Thr Uncertain significance ★★ ⚠ same type
MRTFA p.Ala360Thr Uncertain significance ★★ ⚠ same type
MRTFA p.Ala429Ser Uncertain significance ★★ ⚠ same type
MRTFA p.Ala479Gly Uncertain significance ★★ ⚠ same type
MRTFA p.Ala479Val Uncertain significance ★★ ⚠ same type
MRTFA p.Ala534Thr Uncertain significance ★★ ⚠ same type
MRTFA p.Ala537Val Uncertain significance ★★ ⚠ same type
MRTFA p.Ala616Val 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/mrtfa-p-leu443val (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown