Is ACTA2 p.Arg337Cys (c.1009C>T) pathogenic?

ACTA2 p.Arg337Cys (c.1009C>T) is classified Uncertain significance in ACTA2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-03-06). AlphaMissense: likely pathogenic (0.9964); Absent from gnomAD v4.1; Associated with familial thoracic aortic aneurysm and aortic dissection.

How common is ACTA2 p.Arg337Cys (c.1009C>T) in the general population?

ACTA2 p.Arg337Cys (c.1009C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ACTA2 p.Arg337Cys (c.1009C>T)?

AlphaMissense predicts likely pathogenic (score 0.9964) — an in-silico prediction, not a clinical call.

ACTA2 p.Arg337Cys

Q: What condition is associated with ACTA2 p.Arg337Cys (c.1009C>T)?

ACTA2 p.Arg337Cys (c.1009C>T) is associated with familial thoracic aortic aneurysm and aortic dissection, aortic aneurysm, familial thoracic 6 (ClinVar).

Q: How is Familial thoracic aortic aneurysm and aortic dissection inherited?

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

c.1009C>T · rs1845713745 · VCV1172384

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

0.9964 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

familial thoracic aortic aneurysm and aortic dissection

Computational evidence

Protein change
AlphaMissense	0.9964	likely pathogenic
REVEL	0.917	moderately pathogenic-leaning
SaProt	LLR -12.08	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 9.9	GERP 2, phastCons 1
Regional constraint	o/e 0.47	unconstrained · MANE · 14 kb · p 5.8e-32 · regional, not allelic
Overall
CADD	34.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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: ACTA2
Protein: p.Arg337Cys
Coding: c.1009C>T
dbSNP: rs1845713745
Type: single nucleotide variant
Location: chr10:88935348 (GRCh38)

Full ACTA2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

familial thoracic aortic aneurysm and aortic dissection — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: aortic aneurysm, familial thoracic 6

For Familial thoracic aortic aneurysm and aortic dissection (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult, Childhood

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/acta2-p-arg337cys (accessed [today's date]).

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