Is ACTN3 p.Arg774= (c.2322G>A) pathogenic?

ACTN3 p.Arg774= (c.2322G>A) is classified Benign in ACTN3 (ClinVar, No assertion criteria, 2 submitters; last evaluated 2019-11-12). Common (popmax 17%, nfe) — too common for a highly-penetrant pathogenic allele; Associated with ACTN3-related disorder.

What condition is associated with ACTN3 p.Arg774= (c.2322G>A)?

ACTN3 p.Arg774= (c.2322G>A) is associated with ACTN3-related disorder (ClinVar).

ACTN3 p.Arg774=

Q: How common is ACTN3 p.Arg774= (c.2322G>A) in the general population?

ACTN3 p.Arg774= (c.2322G>A) is common (popmax 17%, nfe) — too common for a highly-penetrant pathogenic allele (gnomAD).

c.2322G>A · rs77239910 · VCV3056361

Benign No assertion criteria

Classification

Benign

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Common

common (popmax 17%, nfe) — too common for a highly-penetrant pathogenic allele

Conditions

ACTN3-related disorder

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.51	donor gain · deltas
Pangolin	Δ0.64	loss · gain 0.50 · SpliceAI calls gain · independent
Constraint at this position
Conservation	phyloP 9.8	GERP 2.5, phastCons 1
Overall
CADD	24.6	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 17% European (non-Finnish) · 200,462/1,179,844 alleles

Filtering AF 16.9% ClinGen BA1/BS1 input FAF95, joint · FAF99 16.9%

Overall 15.2% 245,995/1,613,836 alleles · common

Ancestry group	Frequency	1 in
Amishnot grpmax-eligible	19.7%	5
European (non-Finnish)grpmax	17%	6
Finnishnot grpmax-eligible	16.8%	6
South Asian	15.1%	7
Remaining individualsnot grpmax-eligible	13.9%	7
Ashkenazi Jewishnot grpmax-eligible	12.8%	8
Middle Eastern	10.7%	9
Admixed American	7.39%	14
African / African-American	3.05%	33
East Asian	2.31%	43

Amish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: ACTN3
Protein: p.Arg774=
Coding: c.2322G>A
MANE Select: NM_001104
dbSNP: rs77239910
Type: single nucleotide variant
Location: chr11:66562168 (GRCh38)
Gene constraint: LOEUF 0.944 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.61 · 3 PDB
Residue 774: a UniProt-annotated variant site (very low expression, if any, at the protein level in skeletal muscle); the ef-hand 1 domain

Full ACTN3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ACTN3-related disorder

Similar variants

ACTN3 c.1129-8C>T Likely benign same condition
ACTN3 c.1678-8G>A Benign same condition
ACTN3 p.Ala417Ser Benign same condition
ACTN3 p.Ala469= Likely benign same condition
ACTN3 p.Ala492= Likely benign same condition
ACTN3 p.Ala564= Likely benign same condition
ACTN3 p.Ala881Ser Likely benign same condition
ACTN3 p.Arg199Gln Likely benign 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/actn3-p-arg774 (accessed [today's date]).

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