Is MRTFA p.Pro879Leu (c.2636C>T) pathogenic?

MRTFA p.Pro879Leu (c.2636C>T) is classified Uncertain significance in MRTFA (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-11-09). AlphaMissense: likely benign (0.0687); Very rare (popmax 0.00281%, afr).

How common is MRTFA p.Pro879Leu (c.2636C>T) in the general population?

MRTFA p.Pro879Leu (c.2636C>T) is very rare (popmax 0.00281%, afr) (gnomAD).

What do computational predictors say about MRTFA p.Pro879Leu (c.2636C>T)?

AlphaMissense predicts likely benign (score 0.0687) — an in-silico prediction, not a clinical call.

MRTFA p.Pro879Leu

c.2636C>T · rs750388772 · VCV1682935

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0687 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00281%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0687	likely benign
REVEL	0.045	moderately benign-leaning
SaProt	LLR -6.99	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.28	GERP -1.1
Regional constraint	o/e 1.06	unconstrained · MANE · 13 kb · p 0.043 · regional, not allelic
Overall
CADD	11.09	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM P779L vs ClinVar P879L) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00281% African / African-American · 2/71,258 alleles

Filtering AF 0.0019% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00165%

Overall 0.0024% 36/1,497,486 alleles · very rare exomes 34/1,345,348 · genomes 2/152,138 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00281%	35,629
South Asian	0.00278%	35,936
European (non-Finnish)	0.00267%	37,403
Admixed American	0.00235%	42,626
Remaining individualsnot grpmax-eligible	0.00175%	57,162

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.Pro879Leu
Coding: c.2636C>T
MANE Select: NM_020831
dbSNP: rs750388772
Type: single nucleotide variant
Location: chr22:40411850 (GRCh38)
Gene constraint: LOEUF 0.389 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 56.59 · 2 PDB
Residue 779 UniProt numbering: the 'disordered' region; a UniProt-annotated variant site (in imd66; probable loss-of-function; patient's dendritic cells are morphologically distinct from control dendritic cells and show reduced spreading on fibronectin-coated coverslips, a marked reduction in total f-actin staining and a complete absence of podosomes, a similar phenotype to that of thp1 cells in which mrtfa was silenced)

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

Similar variants

MRTFA p.Pro879= Likely benign ★★ same residue
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

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-pro879leu (accessed [today's date]).

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