Is SMARCA4 p.Ala577Val (c.1730C>T) pathogenic?

SMARCA4 p.Ala577Val (c.1730C>T) is classified Uncertain significance in SMARCA4 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-03-31). AlphaMissense: likely benign (0.1223); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with SMARCA4 p.Ala577Val (c.1730C>T)?

SMARCA4 p.Ala577Val (c.1730C>T) is associated with hereditary neoplastic syndrome (ClinVar).

How common is SMARCA4 p.Ala577Val (c.1730C>T) in the general population?

SMARCA4 p.Ala577Val (c.1730C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about SMARCA4 p.Ala577Val (c.1730C>T)?

AlphaMissense predicts likely benign (score 0.1223) — an in-silico prediction, not a clinical call.

SMARCA4 p.Ala577Val

c.1730C>T · VCV4864749

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1223 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.1223	likely benign
REVEL	0.023	moderately benign-leaning
SaProt	LLR -9.37	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 7.6	GERP 2, phastCons 1
Regional constraint	o/e 0.66	unconstrained · MANE · 12 kb · p 5.5e-06 · regional, not allelic
Overall
CADD	25.5	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: SMARCA4
Protein: p.Ala577Val
Coding: c.1730C>T
MANE Select: NM_003072
Type: single nucleotide variant
Location: chr19:10996349 (GRCh38)
Gene constraint: LOEUF 0.226 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 65.38 · 31 PDB
Residue 577: the 'disordered' region; the 'rna-binding region which is sufficient for binding to lncrna evf2' region

Full SMARCA4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

SMARCA4 p.Ala577Ser Uncertain significance ★★ ⚠ same residue
SMARCA4 p.Ala577Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
SMARCA4 p.Ala577= Likely benign ★ same residue
SMARCA4 c.1943+1G>A Likely pathogenic ★★ same condition
SMARCA4 c.2438+1G>A Pathogenic/Likely pathogenic ★★ same condition
SMARCA4 c.3216-1G>C Likely pathogenic ★★ same condition
SMARCA4 c.3546+1G>A Likely pathogenic ★★ same condition
SMARCA4 c.3774+2T>A Likely 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/smarca4-p-ala577val (accessed [today's date]).

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