Is ACTG1 p.Pro264= (c.792T>C) pathogenic?

ACTG1 p.Pro264= (c.792T>C) is classified Likely benign in ACTG1 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-12-02). Absent from gnomAD v4.1; Associated with autosomal dominant nonsyndromic hearing loss 20.

What condition is associated with ACTG1 p.Pro264= (c.792T>C)?

ACTG1 p.Pro264= (c.792T>C) is associated with autosomal dominant nonsyndromic hearing loss 20, Baraitser-winter syndrome 2 (ClinVar).

How common is ACTG1 p.Pro264= (c.792T>C) in the general population?

ACTG1 p.Pro264= (c.792T>C) is absent from gnomAD v4.1 (gnomAD).

ACTG1 p.Pro264=

c.792T>C · rs1555666602 · VCV2929783

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

autosomal dominant nonsyndromic hearing loss 20

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 -3.7
Overall
CADD	0.301	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: ACTG1
Protein: p.Pro264=
Coding: c.792T>C
MANE Select: NM_001614
dbSNP: rs1555666602
Type: single nucleotide variant
Location: chr17:81511198 (GRCh38)
Gene constraint: LOEUF 0.617 · pLI 0.46 (gnomAD)
Structure: AlphaFold pLDDT 95.44 · 11 PDB
Residue 264: a UniProt-annotated variant site (in dfna20); an α-helix

Full ACTG1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal dominant nonsyndromic hearing loss 20 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Baraitser-winter syndrome 2

Similar variants

ACTG1 p.Pro264Leu Pathogenic ★★ same residue
ACTG1 p.Pro264Ser Uncertain significance ★ ⚠ same residue
ACTG1 p.Ala135Val Pathogenic/Likely pathogenic ★★ same condition
ACTG1 p.Ala204Gly Likely pathogenic ★★ same condition
ACTG1 p.Arg183Gln Pathogenic/Likely pathogenic ★★ same condition
ACTG1 p.Arg183Trp Pathogenic/Likely pathogenic ★★ same condition
ACTG1 p.Arg206Gln Pathogenic/Likely pathogenic ★★ same condition
ACTG1 p.Arg210Cys 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/actg1-p-pro264 (accessed [today's date]).

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