Is POLE p.Leu343= (c.1027C>T) pathogenic?

POLE p.Leu343= (c.1027C>T) is classified Likely benign in POLE (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-10-13). Very rare (popmax 8.48e-05%, nfe); Associated with hereditary neoplastic syndrome.

What condition is associated with POLE p.Leu343= (c.1027C>T)?

POLE p.Leu343= (c.1027C>T) is associated with hereditary neoplastic syndrome (ClinVar).

How common is POLE p.Leu343= (c.1027C>T) in the general population?

POLE p.Leu343= (c.1027C>T) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

POLE p.Leu343=

c.1027C>T · rs2136012036 · VCV1769885

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

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 4.3	GERP 0.67, phastCons 1
Overall
CADD	14.04	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,556 alleles

Overall 6.2e-05% 1/1,613,694 alleles · very rare exomes 1/1,461,338 · genomes 0/152,356 · 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: POLE
Protein: p.Leu343=
Coding: c.1027C>T
MANE Select: NM_006231
dbSNP: rs2136012036
Type: single nucleotide variant
Location: chr12:132675814 (GRCh38)
Gene constraint: LOEUF 0.75 · pLI <0.01 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 80.32 · 18 PDB
Residue 343: an α-helix

Full POLE 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

POLE p.Leu343Pro Uncertain significance ★★ ⚠ same residue
POLE c.1686+32C>G Pathogenic/Likely pathogenic ★★ same condition
POLE p.Leu424Val Pathogenic ★★ same condition
POLE c.1020+5G>A Uncertain significance ★★ same condition
POLE c.1106+3G>C Uncertain significance ★★ same condition
POLE c.1106+4A>G Uncertain significance ★★ same condition
POLE c.1226+3A>G Uncertain significance ★★ same condition
POLE c.1359+4C>A Uncertain significance ★★ 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/pole-p-leu343 (accessed [today's date]).

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