Is ACTA2 p.Thr280= (c.840C>A) pathogenic?

ACTA2 p.Thr280= (c.840C>A) is classified Likely benign in ACTA2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-06-25). Absent from gnomAD v4.1; Associated with aortic aneurysm, familial thoracic 6.

What condition is associated with ACTA2 p.Thr280= (c.840C>A)?

ACTA2 p.Thr280= (c.840C>A) is associated with aortic aneurysm, familial thoracic 6 (ClinVar).

How common is ACTA2 p.Thr280= (c.840C>A) in the general population?

ACTA2 p.Thr280= (c.840C>A) is absent from gnomAD v4.1 (gnomAD).

ACTA2 p.Thr280=

Q: How is Multisystemic smooth muscle dysfunction syndrome inherited?

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

c.840C>A · rs1430885477 · VCV2873630

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

aortic aneurysm, familial thoracic 6

⚠ Built without this gene's context — gene constraint and dosage, protein structure, pathways, panels and related-variant links were not looked up for this page. why

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP -0.17	GERP 1.1, phastCons 0.056
Overall
CADD	23.5	PHRED · no single calibrated threshold — expert panels disagree

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.Thr280=
Coding: c.840C>A
MANE Select: NM_001613
dbSNP: rs1430885477
Type: single nucleotide variant
Location: chr10:88938211 (GRCh38)

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

Disease context

aortic aneurysm, familial thoracic 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Multisystemic smooth muscle dysfunction syndrome (Orphanet):

Inheritance: Unknown
Onset: Infancy

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-thr280 (accessed [today's date]).

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