Is ALG3 p.Cys307Tyr (c.920G>A) pathogenic?

ALG3 p.Cys307Tyr (c.920G>A) is classified Uncertain significance in ALG3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-29). AlphaMissense: likely benign (0.0724); Absent from gnomAD v4.1; Associated with Inborn genetic diseases.

What condition is associated with ALG3 p.Cys307Tyr (c.920G>A)?

ALG3 p.Cys307Tyr (c.920G>A) is associated with Inborn genetic diseases (ClinVar).

How common is ALG3 p.Cys307Tyr (c.920G>A) in the general population?

ALG3 p.Cys307Tyr (c.920G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ALG3 p.Cys307Tyr (c.920G>A)?

AlphaMissense predicts likely benign (score 0.0724) — an in-silico prediction, not a clinical call.

ALG3 p.Cys307Tyr

c.920G>A · VCV4038201

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0724 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0724	likely benign
REVEL	0.261	benign-leaning
SaProt	LLR -7.96	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.1	GERP -0.47, phastCons 1
Regional constraint	o/e 0.82	unconstrained · MANE · 2,165 bp · p 0.0031 · regional, not allelic
Overall
CADD	15.56	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — 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: ALG3
Protein: p.Cys307Tyr
Coding: c.920G>A
MANE Select: NM_005787
Type: single nucleotide variant
Location: chr3:184243803 (GRCh38)
Gene constraint: LOEUF 0.972 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.05

Full ALG3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ALG3 p.Cys307Ter Likely pathogenic ★ same residue
ALG3 p.Ala102Ser Uncertain significance ★★ ⚠ same condition
ALG3 p.Arg229Cys Uncertain significance ★★ ⚠ same condition
ALG3 p.Arg27Gly Uncertain significance ★★ ⚠ same condition
ALG3 p.Arg378Cys Uncertain significance ★★ ⚠ same condition
ALG3 p.Asn83Ser Uncertain significance ★★ ⚠ same condition
ALG3 p.Cys21Gly Uncertain significance ★★ ⚠ same condition
ALG3 p.Cys21Phe 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/alg3-p-cys307tyr (accessed [today's date]).

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