Is PMS2 p.Cys276Ser (c.826T>A) pathogenic?

PMS2 p.Cys276Ser (c.826T>A) is classified Uncertain significance in PMS2 (ClinVar, Single submitter, 1 submitter; last evaluated 2018-06-08). AlphaMissense: likely benign (0.1498); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with PMS2 p.Cys276Ser (c.826T>A)?

PMS2 p.Cys276Ser (c.826T>A) is associated with hereditary neoplastic syndrome (ClinVar).

How common is PMS2 p.Cys276Ser (c.826T>A) in the general population?

PMS2 p.Cys276Ser (c.826T>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about PMS2 p.Cys276Ser (c.826T>A)?

AlphaMissense predicts likely benign (score 0.1498) — an in-silico prediction, not a clinical call.

PMS2 p.Cys276Ser

c.826T>A · rs1407229027 · VCV827548

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1498 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.1498	likely benign
REVEL	0.37	indeterminate
SaProt	LLR -7.78	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · A>C here scores Δ0.21 · evaluated, not missing
Constraint at this position
Conservation	phyloP 5.1	phastCons 1
Regional constraint	o/e 1.09	unconstrained · MANE · 22 kb · p 0.015 · regional, not allelic
Overall
CADD	15.46	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.

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.Cys276Ser
Coding: c.826T>A
MANE Select: NM_000535
dbSNP: rs1407229027
Type: single nucleotide variant
Location: chr7:5995611 (GRCh38)
Gene constraint: LOEUF 0.898 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 71.37 · 9 PDB

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

Similar variants

PMS2 p.Cys276Ter Pathogenic ★★ same residue
PMS2 p.Cys276Arg Uncertain significance ★★ same residue
PMS2 p.Cys276Tyr Uncertain significance ★★ ⚠ same residue
PMS2 p.Cys276= Benign/Likely benign ★★ same residue
PMS2 p.Cys276Gly Uncertain significance ★ ⚠ same residue
PMS2 p.Cys276Trp Uncertain significance ★ same residue
PMS2 p.Cys276Phe Uncertain significance ★ ⚠ same residue
PMS2 c.163+2T>C 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/pms2-p-cys276ser (accessed [today's date]).

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