Is ACTA2 p.Tyr220= (c.660T>C) pathogenic?

ACTA2 p.Tyr220= (c.660T>C) is classified Likely benign in ACTA2 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-06-30). Very rare (popmax 6.84e-05%); Associated with familial thoracic aortic aneurysm and aortic dissection.

What condition is associated with ACTA2 p.Tyr220= (c.660T>C)?

ACTA2 p.Tyr220= (c.660T>C) is associated with familial thoracic aortic aneurysm and aortic dissection (ClinVar).

How common is ACTA2 p.Tyr220= (c.660T>C) in the general population?

ACTA2 p.Tyr220= (c.660T>C) is very rare (popmax 6.84e-05%) (gnomAD).

ACTA2 p.Tyr220=

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.660T>C · rs1845812242 · VCV921662

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 6.84e-05%)

Conditions

familial thoracic aortic aneurysm and aortic dissection

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 -4.6	GERP -4
Overall
CADD	4.822	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 6.84e-05%

Overall 6.84e-05% 1/1,461,726 alleles · very rare

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: ACTA2
Protein: p.Tyr220=
Coding: c.660T>C
dbSNP: rs1845812242
Type: single nucleotide variant
Location: chr10:88939655 (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

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-tyr220 (accessed [today's date]).

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