Is PMS2 p.Ala474Val (c.1421C>T) pathogenic?

PMS2 p.Ala474Val (c.1421C>T) is classified Conflicting classifications of pathogenicity in PMS2 (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2025-12-27). AlphaMissense: likely benign (0.069); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with PMS2 p.Ala474Val (c.1421C>T)?

PMS2 p.Ala474Val (c.1421C>T) is associated with hereditary neoplastic syndrome, Lynch syndrome (ClinVar).

How common is PMS2 p.Ala474Val (c.1421C>T) in the general population?

PMS2 p.Ala474Val (c.1421C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about PMS2 p.Ala474Val (c.1421C>T)?

AlphaMissense predicts likely benign (score 0.069) — an in-silico prediction, not a clinical call.

PMS2 p.Ala474Val

c.1421C>T · VCV3780447

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.069 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.069	likely benign
REVEL	0.122	moderately benign-leaning
SaProt	LLR -6.66	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 -1.8
Regional constraint	o/e 1.09	unconstrained · MANE · 22 kb · p 0.015 · regional, not allelic
Overall
CADD	0.046	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: PMS2
Protein: p.Ala474Val
Coding: c.1421C>T
MANE Select: NM_000535
Type: single nucleotide variant
Location: chr7:5987344 (GRCh38)
Gene constraint: LOEUF 0.898 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 71.37 · 9 PDB
Residue 474: the 'disordered' region

Full PMS2 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

Similar variants

PMS2 p.Ala474Thr Uncertain significance ★★ ⚠ same residue
PMS2 p.Ala474= Benign/Likely benign ★★ same residue
PMS2 p.Ala474Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
PMS2 c.1144+2T>A Likely pathogenic ★★★ same condition
PMS2 c.163+2T>C Likely pathogenic ★★★ same condition
PMS2 c.164-2A>G Likely pathogenic ★★★ same condition
PMS2 c.2007-1G>A Likely pathogenic ★★★ same condition
PMS2 c.2174+1G>A 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/pms2-p-ala474val (accessed [today's date]).

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