Is CTNNA3 p.Arg484Ser (c.1450C>A) pathogenic?

CTNNA3 p.Arg484Ser (c.1450C>A) is classified Uncertain significance in CTNNA3 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-07-22). AlphaMissense: likely benign (0.1374); Absent from gnomAD v4.1; Associated with arrhythmogenic right ventricular dysplasia 13.

What condition is associated with CTNNA3 p.Arg484Ser (c.1450C>A)?

CTNNA3 p.Arg484Ser (c.1450C>A) is associated with arrhythmogenic right ventricular dysplasia 13 (ClinVar).

How common is CTNNA3 p.Arg484Ser (c.1450C>A) in the general population?

CTNNA3 p.Arg484Ser (c.1450C>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CTNNA3 p.Arg484Ser (c.1450C>A)?

AlphaMissense predicts likely benign (score 0.1374) — an in-silico prediction, not a clinical call.

CTNNA3 p.Arg484Ser

Q: How is Inherited isolated arrhythmogenic cardiomyopathy inherited?

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

c.1450C>A · rs200182913 · VCV956438

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1374 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

arrhythmogenic right ventricular dysplasia 13

Computational evidence

Protein change
AlphaMissense	0.1374	likely benign
REVEL	0.039	moderately benign-leaning
SaProt	LLR -5.47	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 2.4	GERP -1, phastCons 0.39
Regional constraint	o/e 1.09	unconstrained · MANE · 1,727 kb · p 0.0022 · regional, not allelic
Overall
CADD	12.58	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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CTNNA3
Protein: p.Arg484Ser
Coding: c.1450C>A
MANE Select: NM_013266
dbSNP: rs200182913
Type: single nucleotide variant
Location: chr10:66520698 (GRCh38)
Gene constraint: LOEUF 0.875 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 81.65

Full CTNNA3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

arrhythmogenic right ventricular dysplasia 13 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Inherited isolated arrhythmogenic cardiomyopathy (Orphanet):

Inheritance: Autosomal dominant
Onset: No data available

Similar variants

CTNNA3 p.Arg484His Uncertain significance ★★ ⚠ same residue
CTNNA3 p.Arg484Cys Likely benign ★★ ⚠ same residue
CTNNA3 c.100-7A>G Uncertain significance ★★ same condition
CTNNA3 c.843+1G>T Uncertain significance ★★ same condition
CTNNA3 p.Ala124Thr Uncertain significance ★★ ⚠ same condition
CTNNA3 p.Ala130Pro Uncertain significance ★★ ⚠ same condition
CTNNA3 p.Ala131Val Uncertain significance ★★ ⚠ same condition
CTNNA3 p.Ala165Thr 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/ctnna3-p-arg484ser (accessed [today's date]).

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