Is ACTN2 p.Arg621= (c.1863C>T) pathogenic?

ACTN2 p.Arg621= (c.1863C>T) is classified Conflicting classifications of pathogenicity in ACTN2 (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2025-03-10). Very rare (popmax 0.00134%, afr); Associated with Cardiovascular phenotype.

What condition is associated with ACTN2 p.Arg621= (c.1863C>T)?

ACTN2 p.Arg621= (c.1863C>T) is associated with Cardiovascular phenotype, dilated cardiomyopathy 1AA, familial hypertrophic cardiomyopathy (ClinVar).

How common is ACTN2 p.Arg621= (c.1863C>T) in the general population?

ACTN2 p.Arg621= (c.1863C>T) is very rare (popmax 0.00134%, afr) (gnomAD).

ACTN2 p.Arg621=

c.1863C>T · rs1161843319 · VCV1637524

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00134%, 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 -0.21	GERP -4.7, phastCons 0.051
Overall
CADD	12.64	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,904 alleles

Filtering AF 0.000542% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000428%

Overall 0.000805% 13/1,614,004 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00134%	74,904
European (non-Finnish)	0.00102%	98,336

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: ACTN2
Protein: p.Arg621=
Coding: c.1863C>T
MANE Select: NM_001103
dbSNP: rs1161843319
Type: single nucleotide variant
Location: chr1:236753970 (GRCh38)
Gene constraint: LOEUF 0.432 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 84.88 · 18 PDB
Residue 621: an α-helix

Full ACTN2 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: dilated cardiomyopathy 1AA familial hypertrophic cardiomyopathy

Similar variants

ACTN2 p.Arg621Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
ACTN2 p.Arg621His Conflicting classifications of pathogenicity ★ ⚠ same residue
ACTN2 p.Ala119Thr Pathogenic/Likely pathogenic ★★ same condition
ACTN2 p.Thr247Met Likely pathogenic ★★ same condition
ACTN2 c.1107+3G>A Uncertain significance ★★ same condition
ACTN2 c.1108-10A>G Uncertain significance ★★ same condition
ACTN2 c.1255+1G>C Uncertain significance ★★ same condition
ACTN2 c.126+2T>G 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/actn2-p-arg621 (accessed [today's date]).

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