Is CACNB2 p.Gln301= (c.903A>G) pathogenic?

CACNB2 p.Gln301= (c.903A>G) is classified Likely benign in CACNB2 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-04-25). Absent from gnomAD v4.1; Associated with Brugada syndrome 4.

What condition is associated with CACNB2 p.Gln301= (c.903A>G)?

CACNB2 p.Gln301= (c.903A>G) is associated with Brugada syndrome 4 (ClinVar).

How common is CACNB2 p.Gln301= (c.903A>G) in the general population?

CACNB2 p.Gln301= (c.903A>G) is absent from gnomAD v4.1 (gnomAD).

How is Brugada syndrome inherited?

Typically Autosomal dominant, Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

CACNB2 p.Gln301=

c.903A>G · rs2494570822 · VCV2188404

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

Brugada syndrome 4

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 0.002	GERP -3.9, phastCons 0.045
Overall
CADD	4.079	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: CACNB2
Protein: p.Gln301=
Coding: c.903A>G
MANE Select: NM_201596
dbSNP: rs2494570822
Type: single nucleotide variant
Location: chr10:18518927 (GRCh38)
Gene constraint: LOEUF 0.77 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 65.78 · 3 PDB
Residue 301: an α-helix

Full CACNB2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Brugada syndrome 4 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Brugada syndrome (Orphanet):

Inheritance: Autosomal dominant, Not applicable
Onset: Adult, Childhood
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

CACNB2 c.1206+5G>A Uncertain significance ★★ same condition
CACNB2 c.1303-3C>T Uncertain significance ★★ same condition
CACNB2 c.1488+6G>A Uncertain significance ★★ same condition
CACNB2 p.Ala105Thr Uncertain significance ★★ ⚠ same condition
CACNB2 p.Ala118Val Uncertain significance ★★ ⚠ same condition
CACNB2 p.Ala128Val Uncertain significance ★★ ⚠ same condition
CACNB2 p.Ala139Ser Uncertain significance ★★ ⚠ same condition
CACNB2 p.Ala229Asp 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/cacnb2-p-gln301 (accessed [today's date]).

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