Is COPA p.Cys380Arg (c.1138T>C) pathogenic?

COPA p.Cys380Arg (c.1138T>C) is classified Likely benign in COPA (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-06). AlphaMissense: likely pathogenic (0.9743); Very rare (popmax 0.00136%, afr); Associated with autoimmune interstitial lung disease-arthritis syndrome.

What condition is associated with COPA p.Cys380Arg (c.1138T>C)?

COPA p.Cys380Arg (c.1138T>C) is associated with autoimmune interstitial lung disease-arthritis syndrome (ClinVar).

How common is COPA p.Cys380Arg (c.1138T>C) in the general population?

COPA p.Cys380Arg (c.1138T>C) is very rare (popmax 0.00136%, afr) (gnomAD).

What do computational predictors say about COPA p.Cys380Arg (c.1138T>C)?

AlphaMissense predicts likely pathogenic (score 0.9743) — an in-silico prediction, not a clinical call.

COPA p.Cys380Arg

Q: How is Autoimmune interstitial lung disease-arthritis syndrome inherited?

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

c.1138T>C · VCV4773632

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9743 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00136%, afr)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

autoimmune interstitial lung disease-arthritis syndrome

Computational evidence

Protein change
AlphaMissense	0.9743	likely pathogenic
REVEL	0.707	pathogenic-leaning
SaProt	LLR -14.65	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 2.6, phastCons 1
Regional constraint	o/e 0.72	unconstrained · MANE · 42 kb · p 1.1e-24 · regional, not allelic
Overall
CADD	27.3	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00136% African / African-American · 1/73,588 alleles

Overall 0.000126% 2/1,591,036 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00136%	73,588
European (non-Finnish)	8.55e-05%	1,169,060

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: COPA
Protein: p.Cys380Arg
Coding: c.1138T>C
MANE Select: NM_004371
Type: single nucleotide variant
Location: chr1:160310197 (GRCh38)
Gene constraint: LOEUF 0.098 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 83.85 · 3 PDB

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

Disease context

autoimmune interstitial lung disease-arthritis syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autoimmune interstitial lung disease-arthritis syndrome (Orphanet):

Inheritance: Autosomal dominant
Onset: Childhood, Infancy

Similar variants

COPA p.Arg233His Pathogenic/Likely pathogenic ★★ same condition
COPA p.Glu241Lys Pathogenic ★★ same condition
COPA p.Ala111Thr Uncertain significance ★★ ⚠ same condition
COPA p.Ala176Val Uncertain significance ★★ ⚠ same condition
COPA p.Ala407Val Uncertain significance ★★ ⚠ same condition
COPA p.Ala422Thr Uncertain significance ★★ ⚠ same condition
COPA p.Ala469Val Uncertain significance ★★ ⚠ same condition
COPA p.Ala510Thr 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/copa-p-cys380arg (accessed [today's date]).

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