Is PMS2 p.Ser118= (c.354C>T) pathogenic?

PMS2 p.Ser118= (c.354C>T) is classified Conflicting classifications of pathogenicity in PMS2 (ClinVar, Conflicting submitters, 11 submitters; last evaluated 2026-05-05). Very rare (popmax 0.00297%, nfe); Associated with Hereditary nonpolyposis colorectal neoplasms.

How common is PMS2 p.Ser118= (c.354C>T) in the general population?

PMS2 p.Ser118= (c.354C>T) is very rare (popmax 0.00297%, nfe) (gnomAD).

PMS2 p.Ser118=

Q: What condition is associated with PMS2 p.Ser118= (c.354C>T)?

PMS2 p.Ser118= (c.354C>T) is associated with Hereditary nonpolyposis colorectal neoplasms, Lynch syndrome, Lynch syndrome 4 (ClinVar).

c.354C>T · rs760615315 · VCV186067

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 11 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00297%, nfe)

Conditions

Hereditary nonpolyposis colorectal neoplasms

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 -1.4
Overall
CADD	0.684	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00297% European (non-Finnish) · 35/1,177,926 alleles

Filtering AF 0.00216% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00191%

Overall 0.0023% 37/1,609,730 alleles · very rare exomes 35/1,457,552 · genomes 2/152,178 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00297%	33,655
East Asian	0.00223%	44,878
Admixed American	0.00167%	59,992

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: PMS2
Protein: p.Ser118=
Coding: c.354C>T
MANE Select: NM_000535
dbSNP: rs760615315
Type: single nucleotide variant
Location: chr7:6002636 (GRCh38)
Gene constraint: LOEUF 0.898 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 71.37 · 9 PDB
Residue 118: a β-strand

Full PMS2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Hereditary nonpolyposis colorectal neoplasms — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Lynch syndrome Lynch syndrome 4 hereditary neoplastic syndrome

Similar variants

PMS2 p.Ser118Asn Pathogenic/Likely pathogenic ★★ same residue
PMS2 p.Ser118Thr Likely pathogenic ★★ same residue
PMS2 p.Ser118Arg Uncertain significance ★ ⚠ same residue
PMS2 p.Ser118Gly Uncertain significance ★ ⚠ same residue
PMS2 p.Ser118Ile Uncertain significance ★ ⚠ same residue
PMS2 p.Ser118fs Pathogenic ★★ same residue
PMS2 c.1144+2T>A Likely pathogenic ★★★ same condition
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-ser118 (accessed [today's date]).

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