Is PMS2 p.Tyr191= (c.573C>T) pathogenic?

PMS2 p.Tyr191= (c.573C>T) is classified Benign/Likely benign in PMS2 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-01-27). Very rare (popmax 0.00167%, amr); Associated with Hereditary nonpolyposis colorectal neoplasms.

What condition is associated with PMS2 p.Tyr191= (c.573C>T)?

PMS2 p.Tyr191= (c.573C>T) is associated with Hereditary nonpolyposis colorectal neoplasms, Lynch syndrome 4, hereditary neoplastic syndrome (ClinVar).

How common is PMS2 p.Tyr191= (c.573C>T) in the general population?

PMS2 p.Tyr191= (c.573C>T) is very rare (popmax 0.00167%, amr) (gnomAD).

PMS2 p.Tyr191=

c.573C>T · rs761134229 · VCV484326

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

Hereditary nonpolyposis colorectal neoplasms

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.25	acceptor loss · deltas
Pangolin	Δ0.28	loss · gain 0.26 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 7.5	phastCons 1
Overall
CADD	9.492	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/59,970 alleles

Overall 6.2e-05% 1/1,613,888 alleles · very rare exomes 0/1,461,802 · genomes 1/152,086 · joint denominator

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.Tyr191=
Coding: c.573C>T
MANE Select: NM_000535
dbSNP: rs761134229
Type: single nucleotide variant
Location: chr7:5999240 (GRCh38)
Gene constraint: LOEUF 0.898 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 71.37 · 9 PDB
Residue 191: an α-helix

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 4 hereditary neoplastic syndrome

Similar variants

PMS2 p.Tyr191Ter Pathogenic/Likely pathogenic ★★ same residue
PMS2 p.Tyr191His Uncertain significance ★★ ⚠ same residue
PMS2 p.Tyr191Ser Uncertain significance ★★ ⚠ same residue
PMS2 p.Tyr191Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
PMS2 p.Tyr191_Cys192insTer 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

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-tyr191 (accessed [today's date]).

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