Is MSH6 p.Pro673= (c.2019A>G) pathogenic?

MSH6 p.Pro673= (c.2019A>G) is classified Benign/Likely benign in MSH6 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2025-09-22). Very rare (popmax 0.00167%, amr); Associated with hereditary neoplastic syndrome.

What condition is associated with MSH6 p.Pro673= (c.2019A>G)?

MSH6 p.Pro673= (c.2019A>G) is associated with hereditary neoplastic syndrome, Lynch syndrome 5 (ClinVar).

How common is MSH6 p.Pro673= (c.2019A>G) in the general population?

MSH6 p.Pro673= (c.2019A>G) is very rare (popmax 0.00167%, amr) (gnomAD).

MSH6 p.Pro673=

c.2019A>G · rs863224327 · VCV215643

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.1	GERP -0.95, phastCons 1
Overall
CADD	9.153	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/60,010 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000186% 3/1,614,084 alleles · very rare exomes 3/1,461,872 · genomes 0/152,212 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	60,010
European (non-Finnish)	0.000169%	590,005

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: MSH6
Protein: p.Pro673=
Coding: c.2019A>G
MANE Select: NM_000179
dbSNP: rs863224327
Type: single nucleotide variant
Location: chr2:47800002 (GRCh38)
Gene constraint: LOEUF 0.841 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.93 · 8 PDB
Residue 673: a β-strand

Full MSH6 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

Also linked: Lynch syndrome 5

Similar variants

MSH6 p.Pro673Leu Uncertain significance ★★ ⚠ same residue
MSH6 p.Pro673Ser Uncertain significance ★★ ⚠ same residue
MSH6 p.Pro673Ala Conflicting classifications of pathogenicity ★ ⚠ same residue
MSH6 p.Pro673Thr Uncertain significance ★ ⚠ same residue
MSH6 c.3172+1G>T Likely pathogenic ★★★ same condition
MSH6 c.3438+1G>A Likely pathogenic ★★★ same condition
MSH6 c.3439-1G>T Likely pathogenic ★★★ same condition
MSH6 c.3439-2A>G 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/msh6-p-pro673 (accessed [today's date]).

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