Is MSH3 p.Ala57= (c.171C>T) pathogenic?

MSH3 p.Ala57= (c.171C>T) is classified Benign/Likely benign in MSH3 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-07-10). Very rare (popmax 0.00594%, afr); Associated with hereditary neoplastic syndrome.

What condition is associated with MSH3 p.Ala57= (c.171C>T)?

MSH3 p.Ala57= (c.171C>T) is associated with hereditary neoplastic syndrome (ClinVar).

How common is MSH3 p.Ala57= (c.171C>T) in the general population?

MSH3 p.Ala57= (c.171C>T) is very rare (popmax 0.00594%, afr) (gnomAD).

MSH3 p.Ala57=

c.171C>T · rs201906899 · VCV1090405

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00594%, afr)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Overall
CADD	8.927	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00594% African / African-American · 2/33,672 alleles

Filtering AF 0.000984% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000368%

Overall 0.000676% 5/739,552 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00594%	16,836
Admixed American	0.0032%	31,204
South Asian	0.0026%	38,408
European (non-Finnish)	0.000167%	600,236

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: MSH3
Protein: p.Ala57=
Coding: c.171C>T
MANE Select: NM_002439
dbSNP: rs201906899
Type: single nucleotide variant
Location: chr5:80654898 (GRCh38)
Gene constraint: LOEUF 1.027 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.48 · 25 PDB
Residue 57: the 'disordered' region; a UniProt-annotated variant site (sequence variant)

Full MSH3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

MSH3 c.1341-2A>C Likely pathogenic ★★ same condition
MSH3 c.1341-2A>G Likely pathogenic ★★ same condition
MSH3 c.1568+1G>C Likely pathogenic ★★ same condition
MSH3 c.1653+1G>A Likely pathogenic ★★ same condition
MSH3 c.1764-1G>A Pathogenic/Likely pathogenic ★★ same condition
MSH3 c.1764-2A>C Pathogenic/Likely pathogenic ★★ same condition
MSH3 c.1764-2A>G Pathogenic/Likely pathogenic ★★ same condition
MSH3 c.1896+1G>A Pathogenic/Likely pathogenic ★★ same condition

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/msh3-p-ala57 (accessed [today's date]).

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