Is SMARCA4 p.Ser655Pro (c.1963T>C) pathogenic?

SMARCA4 p.Ser655Pro (c.1963T>C) is classified Uncertain significance in SMARCA4 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-05-21). AlphaMissense: likely pathogenic (0.9743); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with SMARCA4 p.Ser655Pro (c.1963T>C)?

SMARCA4 p.Ser655Pro (c.1963T>C) is associated with hereditary neoplastic syndrome (ClinVar).

How common is SMARCA4 p.Ser655Pro (c.1963T>C) in the general population?

SMARCA4 p.Ser655Pro (c.1963T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about SMARCA4 p.Ser655Pro (c.1963T>C)?

AlphaMissense predicts likely pathogenic (score 0.9743) — an in-silico prediction, not a clinical call.

SMARCA4 p.Ser655Pro

c.1963T>C · VCV4864787

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9743 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.9743	likely pathogenic
REVEL	0.369	indeterminate
SaProt	LLR -8.96	tolerated
⇒ AlphaMissense calls this damaging; SaProt does not; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.8	GERP 2, phastCons 1
Regional constraint	o/e 0.66	unconstrained · MANE · 12 kb · p 5.5e-06 · regional, not allelic
Overall
CADD	24.9	PHRED · no single calibrated threshold — expert panels disagree

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.Ser655Pro
Coding: c.1963T>C
MANE Select: NM_003072
Type: single nucleotide variant
Location: chr19:11003359 (GRCh38)
Gene constraint: LOEUF 0.226 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 65.38 · 31 PDB
Residue 655: 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.Ser655Phe Uncertain significance ★★ ⚠ same residue
SMARCA4 p.Ser655= 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
SMARCA4 c.3951+2T>C 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-ser655pro (accessed [today's date]).

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