Is ERCC2 p.Ala226Thr (c.676G>A) pathogenic?

ERCC2 p.Ala226Thr (c.676G>A) is classified Uncertain significance in ERCC2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2022-06-05). AlphaMissense: likely benign (0.0887); Very rare (popmax 0.00223%, eas); Associated with Inborn genetic diseases.

What condition is associated with ERCC2 p.Ala226Thr (c.676G>A)?

ERCC2 p.Ala226Thr (c.676G>A) is associated with Inborn genetic diseases (ClinVar).

How common is ERCC2 p.Ala226Thr (c.676G>A) in the general population?

ERCC2 p.Ala226Thr (c.676G>A) is very rare (popmax 0.00223%, eas) (gnomAD).

What do computational predictors say about ERCC2 p.Ala226Thr (c.676G>A)?

AlphaMissense predicts likely benign (score 0.0887) — an in-silico prediction, not a clinical call.

ERCC2 p.Ala226Thr

c.676G>A · rs753696173 · VCV1356720

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0887 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0887	likely benign
REVEL	0.164	moderately benign-leaning
SaProt	LLR -0.87	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.9	GERP 1.8, phastCons 1
Regional constraint	o/e 0.98	unconstrained · MANE · 17 kb · p 0.48 · regional, not allelic
Overall
CADD	22.3	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,872 alleles

Overall 0.000186% 3/1,613,886 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00223%	44,872
Admixed American	0.00167%	59,994
European (non-Finnish)	8.47e-05%	1,180,018

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: ERCC2
Protein: p.Ala226Thr
Coding: c.676G>A
MANE Select: NM_000400
dbSNP: rs753696173
Type: single nucleotide variant
Location: chr19:45364466 (GRCh38)
Gene constraint: LOEUF 1.089 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 87.74 · 55 PDB
Residue 226: the helicase atp-binding domain; an α-helix

Full ERCC2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ERCC2 p.Ala226= Likely benign ★★ same residue
MAG p.Leu226Gln Uncertain significance ★ ⚠ same residue
ERCC2 p.Ala226Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
ERCC2 p.Ala725Pro Pathogenic/Likely pathogenic ★★ same condition
ERCC2 p.Arg616Pro Pathogenic ★★ same condition
ERCC2 p.Ala108Thr Uncertain significance ★★ ⚠ same condition
ERCC2 p.Ala144Val Uncertain significance ★★ ⚠ same condition
ERCC2 p.Ala306Val 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/ercc2-p-ala226thr (accessed [today's date]).

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