Is SMARCA4 p.Ala186= (c.558C>T) pathogenic?

SMARCA4 p.Ala186= (c.558C>T) is classified Likely benign in SMARCA4 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2022-10-07). Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with SMARCA4 p.Ala186= (c.558C>T)?

SMARCA4 p.Ala186= (c.558C>T) is associated with hereditary neoplastic syndrome, rhabdoid tumor predisposition syndrome 2 (ClinVar).

How common is SMARCA4 p.Ala186= (c.558C>T) in the general population?

SMARCA4 p.Ala186= (c.558C>T) is absent from gnomAD v4.1 (gnomAD).

SMARCA4 p.Ala186=

c.558C>T · rs2145778480 · VCV1748478

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Absent

absent from gnomAD v4.1

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	7.648	PHRED · no single calibrated threshold — expert panels disagree

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.Ala186=
Coding: c.558C>T
MANE Select: NM_003072
dbSNP: rs2145778480
Type: single nucleotide variant
Location: chr19:10986391 (GRCh38)
Gene constraint: LOEUF 0.226 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 65.38 · 31 PDB
Residue 186: the qlq domain; the 'necessary for interaction with ss18l1/crest' region; an α-helix

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.Ala186Val Uncertain significance ★★ ⚠ same residue
SMARCA4 p.Ala186Thr Uncertain significance ★ ⚠ same residue
SMARCA4 p.Ala186Gly 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
SMARCA4 c.3216-2A>G 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-ala186 (accessed [today's date]).

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