Is SMARCA4 p.Pro123= (c.369C>G) pathogenic?

SMARCA4 p.Pro123= (c.369C>G) is classified Likely benign in SMARCA4 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-11-04). Very rare (popmax 0.00133%, afr); Associated with hereditary neoplastic syndrome.

What condition is associated with SMARCA4 p.Pro123= (c.369C>G)?

SMARCA4 p.Pro123= (c.369C>G) is associated with hereditary neoplastic syndrome, rhabdoid tumor predisposition syndrome 2 (ClinVar).

How common is SMARCA4 p.Pro123= (c.369C>G) in the general population?

SMARCA4 p.Pro123= (c.369C>G) is very rare (popmax 0.00133%, afr) (gnomAD).

SMARCA4 p.Pro123=

c.369C>G · rs769607050 · VCV1655863

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00133%, afr)

Conditions

hereditary neoplastic syndrome

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 -1.3	GERP -4.1
Overall
CADD	6.381	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00133% African / African-American · 1/75,042 alleles

Overall 6.2e-05% 1/1,613,868 alleles · very rare exomes 1/1,461,578 · genomes 0/152,290 · joint denominator

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: SMARCA4
Protein: p.Pro123=
Coding: c.369C>G
MANE Select: NM_003072
dbSNP: rs769607050
Type: single nucleotide variant
Location: chr19:10986202 (GRCh38)
Gene constraint: LOEUF 0.226 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 65.38 · 31 PDB
Residue 123: the 'necessary for interaction with ss18l1/crest' region; the 'disordered' 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

Also linked: rhabdoid tumor predisposition syndrome 2

Similar variants

SMARCA4 p.Pro123Thr Uncertain significance ★★ same residue
SMARCA4 p.Pro123His Uncertain significance ★ same residue
SMARCA4 p.Pro123Leu Uncertain significance ★ same residue
SMARCA4 p.Pro123Ser Uncertain significance ★ ⚠ same residue
SMARCA4 c.1943+1G>A Likely pathogenic ★★ same condition
SMARCA4 c.2274+1G>T Likely pathogenic ★★ same condition
SMARCA4 c.2438+1G>A Pathogenic/Likely pathogenic ★★ same condition
SMARCA4 c.3216-1G>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-pro123 (accessed [today's date]).

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