Is ACTC1 p.Ile73= (c.219C>T) pathogenic?

ACTC1 p.Ile73= (c.219C>T) is classified Benign/Likely benign in ACTC1 (ClinVar, Multiple submitters, 13 submitters; last evaluated 2026-01-05). Ultra-rare (popmax 0.0973%, afr); Associated with Cardiovascular phenotype.

What condition is associated with ACTC1 p.Ile73= (c.219C>T)?

ACTC1 p.Ile73= (c.219C>T) is associated with Cardiovascular phenotype, cardiomyopathy, hypertrophic cardiomyopathy (ClinVar).

How common is ACTC1 p.Ile73= (c.219C>T) in the general population?

ACTC1 p.Ile73= (c.219C>T) is ultra-rare (popmax 0.0973%, afr) (gnomAD).

ACTC1 p.Ile73=

c.219C>T · rs376566924 · VCV45172

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 13 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0973%, afr)

Conditions

Cardiovascular phenotype

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -6.6	GERP -4.7
Overall
CADD	1.088	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0973% African / African-American · 73/75,022 alleles

Filtering AF 0.0793% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0727%

Overall 0.00632% 102/1,614,098 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0973%	1,028
Admixed American	0.0167%	6,001
Remaining individualsnot grpmax-eligible	0.0064%	15,627
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,608
East Asian	0.00223%	44,870
European (non-Finnish)	0.0011%	90,770

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: ACTC1
Protein: p.Ile73=
Coding: c.219C>T
MANE Select: NM_005159
dbSNP: rs376566924
Type: single nucleotide variant
Location: chr15:34793480 (GRCh38)
Gene constraint: LOEUF 0.511 · pLI 0.97 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 95.47 · 16 PDB
Residue 73: a β-strand

Full ACTC1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: cardiomyopathy hypertrophic cardiomyopathy hypertrophic cardiomyopathy 11 atrial septal defect 5 dilated cardiomyopathy 1R

Similar variants

ACTC1 p.Ile73Val Uncertain significance ★★ ⚠ same residue
ACTC1 p.Glu101Lys Pathogenic ★★★ same condition
ACTC1 p.Gly345Val Uncertain significance ★★★ ⚠ same condition
ACTC1 p.Pro266Leu Uncertain significance ★★★ ⚠ same condition
ACTC1 p.Val56Ile Uncertain significance ★★★ ⚠ same condition
ACTC1 p.Ala297Ser Pathogenic ★★ ⚠ same condition
ACTC1 p.Gly247Asp Pathogenic/Likely pathogenic ★★ same condition
ACTC1 p.Thr128Ile Likely pathogenic ★★ 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/actc1-p-ile73 (accessed [today's date]).

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