Is PMS2 p.Pro440= (c.1320A>G) pathogenic?

PMS2 p.Pro440= (c.1320A>G) is classified Benign/Likely benign in PMS2 (ClinVar, Multiple submitters, 14 submitters; last evaluated 2026-01-24). Ultra-rare (popmax 0.0207%, nfe); Associated with Hereditary nonpolyposis colorectal neoplasms.

What condition is associated with PMS2 p.Pro440= (c.1320A>G)?

PMS2 p.Pro440= (c.1320A>G) is associated with Hereditary nonpolyposis colorectal neoplasms, Lynch syndrome, breast cancer (ClinVar).

How common is PMS2 p.Pro440= (c.1320A>G) in the general population?

PMS2 p.Pro440= (c.1320A>G) is ultra-rare (popmax 0.0207%, nfe) (gnomAD).

PMS2 p.Pro440=

c.1320A>G · rs138697590 · VCV135933

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 14 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0207%, 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 -1.2
Overall
CADD	0.808	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0207% European (non-Finnish) · 244/1,179,958 alleles

Filtering AF 0.0185% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0177%

Overall 0.0157% 254/1,614,120 alleles · ultra-rare exomes 234/1,461,810 · genomes 20/152,310 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0207%	4,836
Remaining individualsnot grpmax-eligible	0.0064%	15,627
Admixed American	0.005%	20,002
African / African-American	0.004%	25,020

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.Pro440=
Coding: c.1320A>G
MANE Select: NM_000535
dbSNP: rs138697590
Type: single nucleotide variant
Location: chr7:5987445 (GRCh38)
Gene constraint: LOEUF 0.898 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 71.37 · 9 PDB
Residue 440: the 'disordered' region

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 breast cancer Lynch syndrome 4 hereditary neoplastic syndrome

Similar variants

PMS2 p.Pro440Ala Uncertain significance ★★ ⚠ same residue
PMS2 p.Pro440Arg Uncertain significance ★★ ⚠ same residue
PMS2 p.Pro440Leu Uncertain significance ★★ ⚠ same residue
PMS2 p.Pro440Thr Uncertain significance ★★ ⚠ same residue
PMS2 p.Pro440Ser Uncertain significance ★ ⚠ 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

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-pro440 (accessed [today's date]).

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