Is ERCC4 p.Arg8= (c.22C>A) pathogenic?

ERCC4 p.Arg8= (c.22C>A) is classified Likely benign in ERCC4 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-27). Very rare (popmax 0.00186%, nfe); Associated with Cockayne syndrome.

What condition is associated with ERCC4 p.Arg8= (c.22C>A)?

ERCC4 p.Arg8= (c.22C>A) is associated with Cockayne syndrome, xeroderma pigmentosum group F, Fanconi anemia complementation group Q (ClinVar).

How common is ERCC4 p.Arg8= (c.22C>A) in the general population?

ERCC4 p.Arg8= (c.22C>A) is very rare (popmax 0.00186%, nfe) (gnomAD).

How is Cockayne syndrome inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

ERCC4 p.Arg8=

c.22C>A · rs774510191 · VCV1585300

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00186%, nfe)

Conditions

Cockayne 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 -2.4	GERP -3.6
Overall
CADD	3.227	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00186% European (non-Finnish) · 22/1,179,868 alleles

Filtering AF 0.00122% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00104%

Overall 0.00149% 24/1,606,158 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00186%	53,630
Admixed American	0.00167%	60,006
African / African-American	0.00133%	74,926

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.Arg8=
Coding: c.22C>A
MANE Select: NM_005236
dbSNP: rs774510191
Type: single nucleotide variant
Location: chr16:13920187 (GRCh38)
Gene constraint: LOEUF 0.984 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 74.60 · 13 PDB
Residue 8: the 'helicase-like' region

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

Disease context

Cockayne syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: xeroderma pigmentosum group F Fanconi anemia complementation group Q

For Cockayne syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

ERCC4 p.Arg8Ter Pathogenic ★ same residue
ERCC4 p.Arg8Gln Uncertain significance ★ ⚠ 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

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-arg8 (accessed [today's date]).

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