Is ACTG1 p.His73Asp (c.217C>G) pathogenic?

ACTG1 p.His73Asp (c.217C>G) is classified Uncertain significance in ACTG1 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-09). AlphaMissense: likely pathogenic (0.9933); Absent from gnomAD v4.1; Associated with autosomal dominant nonsyndromic hearing loss 20.

What condition is associated with ACTG1 p.His73Asp (c.217C>G)?

ACTG1 p.His73Asp (c.217C>G) is associated with autosomal dominant nonsyndromic hearing loss 20, Baraitser-winter syndrome 2 (ClinVar).

How common is ACTG1 p.His73Asp (c.217C>G) in the general population?

ACTG1 p.His73Asp (c.217C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ACTG1 p.His73Asp (c.217C>G)?

AlphaMissense predicts likely pathogenic (score 0.9933) — an in-silico prediction, not a clinical call.

ACTG1 p.His73Asp

c.217C>G · VCV4782651

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9933 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

autosomal dominant nonsyndromic hearing loss 20

Computational evidence

Protein change
AlphaMissense	0.9933	likely pathogenic
REVEL	0.823	moderately pathogenic-leaning
SaProt	LLR -13.88	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 0.73, phastCons 1
Regional constraint	o/e 0.58	unconstrained · MANE · 367 bp · p 2.2e-06 · regional, not allelic
Overall
CADD	27.4	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

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.His73Asp
Coding: c.217C>G
MANE Select: NM_001614
Type: single nucleotide variant
Location: chr17:81512049 (GRCh38)
Gene constraint: LOEUF 0.617 · pLI 0.46 (gnomAD)
Structure: AlphaFold pLDDT 95.44 · 11 PDB
Residue 73: a modified residue (tele-methylhistidine)

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.His73= Likely benign ★ same residue
ACTG1 p.His73Tyr 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-his73asp (accessed [today's date]).

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