Is ERCC4 p.Ala826Val (c.2477C>T) pathogenic?

ERCC4 p.Ala826Val (c.2477C>T) is classified Uncertain significance in ERCC4 (ClinVar, Multiple submitters, 6 submitters; last evaluated 2025-12-08). AlphaMissense: likely benign (0.0839); Ultra-rare (popmax 0.0657%, mid); Associated with Fanconi anemia complementation group Q.

What condition is associated with ERCC4 p.Ala826Val (c.2477C>T)?

ERCC4 p.Ala826Val (c.2477C>T) is associated with Fanconi anemia complementation group Q, xeroderma pigmentosum group F, XFE progeroid syndrome (ClinVar).

How common is ERCC4 p.Ala826Val (c.2477C>T) in the general population?

ERCC4 p.Ala826Val (c.2477C>T) is ultra-rare (popmax 0.0657%, mid) (gnomAD).

What do computational predictors say about ERCC4 p.Ala826Val (c.2477C>T)?

AlphaMissense predicts likely benign (score 0.0839) — an in-silico prediction, not a clinical call.

ERCC4 p.Ala826Val

c.2477C>T · rs141790888 · VCV134136

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 6 submitters

AlphaMissense

likely benign

0.0839 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0657%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Fanconi anemia complementation group Q

Computational evidence

Protein change
AlphaMissense	0.0839	likely benign
REVEL	0.066	moderately benign-leaning
SaProt	LLR -8.18	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 1.1	GERP 1.9, phastCons 0.11
Regional constraint	o/e 1.08	unconstrained · MANE · 28 kb · p 0.011 · regional, not allelic
Overall
CADD	20.1	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 0.0657% Middle Eastern · 4/6,084 alleles

Filtering AF 0.0224% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0166%

Overall 0.00539% 87/1,614,020 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0657%	1,521
East Asian	0.0334%	2,993
South Asian	0.00769%	13,011
Remaining individualsnot grpmax-eligible	0.0048%	20,830
European (non-Finnish)	0.00466%	21,455
Admixed American	0.00333%	29,997
Finnishnot grpmax-eligible	0.00156%	64,020

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: ERCC4
Protein: p.Ala826Val
Coding: c.2477C>T
MANE Select: NM_005236
dbSNP: rs141790888
Type: single nucleotide variant
Location: chr16:13948073 (GRCh38)
Gene constraint: LOEUF 0.984 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 74.60 · 13 PDB

Full ERCC4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Fanconi anemia complementation group Q — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: xeroderma pigmentosum group F XFE progeroid syndrome Cockayne syndrome

Similar variants

ERCC4 p.Ala826= Likely benign ★ same residue
ERCC4 c.1102+1G>T Likely pathogenic ★★ same condition
ERCC4 c.793-2A>G Pathogenic ★★ same condition
ERCC4 p.Arg20Ter Pathogenic ★★ same condition
ERCC4 p.Arg589Trp Pathogenic/Likely pathogenic ★★ same condition
ERCC4 p.Arg689Ser Likely pathogenic ★★ same condition
ERCC4 p.Arg772Ter Pathogenic/Likely pathogenic ★★ same condition
ERCC4 p.Cys236Arg Pathogenic/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/ercc4-p-ala826val (accessed [today's date]).

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