Is ACTG1 p.Val219= (c.657C>T) pathogenic?

ACTG1 p.Val219= (c.657C>T) is classified Likely benign in ACTG1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-09-14). Very rare (popmax 0.00534%, nfe); Associated with autosomal dominant nonsyndromic hearing loss 20.

What condition is associated with ACTG1 p.Val219= (c.657C>T)?

ACTG1 p.Val219= (c.657C>T) is associated with autosomal dominant nonsyndromic hearing loss 20, Baraitser-winter syndrome 2 (ClinVar).

How common is ACTG1 p.Val219= (c.657C>T) in the general population?

ACTG1 p.Val219= (c.657C>T) is very rare (popmax 0.00534%, nfe) (gnomAD).

ACTG1 p.Val219=

c.657C>T · rs782248094 · VCV774551

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00534%, nfe)

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 -4	GERP -3.8
Overall
CADD	6.32	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00534% European (non-Finnish) · 63/1,180,056 alleles

Filtering AF 0.00426% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00387%

Overall 0.0044% 71/1,613,762 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00534%	18,731
Admixed American	0.005%	20,004
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,606
African / African-American	0.00267%	37,469
Remaining individualsnot grpmax-eligible	0.0016%	62,480
South Asian	0.0011%	91,090

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: ACTG1
Protein: p.Val219=
Coding: c.657C>T
MANE Select: NM_001614
dbSNP: rs782248094
Type: single nucleotide variant
Location: chr17:81511333 (GRCh38)
Gene constraint: LOEUF 0.617 · pLI 0.46 (gnomAD)
Structure: AlphaFold pLDDT 95.44 · 11 PDB

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.Val219Ile Uncertain significance ★★ ⚠ same residue
ACTG1 p.Val219Phe Likely pathogenic ★ 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-val219 (accessed [today's date]).

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