Is PMS2 p.Thr703= (c.2109G>A) pathogenic?

PMS2 p.Thr703= (c.2109G>A) is classified Benign/Likely benign in PMS2 (ClinVar, Multiple submitters, 10 submitters; last evaluated 2026-02-02). Very rare (popmax 0.00674%, afr); Associated with hereditary neoplastic syndrome.

What condition is associated with PMS2 p.Thr703= (c.2109G>A)?

PMS2 p.Thr703= (c.2109G>A) is associated with hereditary neoplastic syndrome, Lynch syndrome 4 (ClinVar).

How common is PMS2 p.Thr703= (c.2109G>A) in the general population?

PMS2 p.Thr703= (c.2109G>A) is very rare (popmax 0.00674%, afr) (gnomAD).

PMS2 p.Thr703=

c.2109G>A · rs775355718 · VCV186614

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 10 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00674%, afr)

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 -20
Overall
CADD	0.03	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00674% African / African-American · 5/74,140 alleles

Filtering AF 0.00257% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00163%

Overall 0.000748% 12/1,603,380 alleles · very rare exomes 11/1,451,890 · genomes 1/151,490 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00674%	14,828
Admixed American	0.0017%	58,876
South Asian	0.00111%	90,280
European (non-Finnish)	0.000426%	234,887

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.Thr703=
Coding: c.2109G>A
MANE Select: NM_000535
dbSNP: rs775355718
Type: single nucleotide variant
Location: chr7:5982889 (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

Also linked: Lynch syndrome 4

Similar variants

PMS2 p.Thr703Lys Uncertain significance ★★ ⚠ same residue
PMS2 p.Thr703Met Conflicting classifications of pathogenicity ★ same residue
PMS2 p.Thr703fs Pathogenic ★ 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-thr703 (accessed [today's date]).

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