Is CACNB2 p.Arg506= (c.1518C>T) pathogenic?

CACNB2 p.Arg506= (c.1518C>T) is classified Benign/Likely benign in CACNB2 (ClinVar, Multiple submitters, 9 submitters; last evaluated 2026-02-02). Low-frequency (popmax 3.5%, afr); Associated with Cardiovascular phenotype.

What condition is associated with CACNB2 p.Arg506= (c.1518C>T)?

CACNB2 p.Arg506= (c.1518C>T) is associated with Cardiovascular phenotype, Brugada syndrome 4 (ClinVar).

How common is CACNB2 p.Arg506= (c.1518C>T) in the general population?

CACNB2 p.Arg506= (c.1518C>T) is low-frequency (popmax 3.5%, afr) (gnomAD).

CACNB2 p.Arg506=

c.1518C>T · rs34813638 · VCV136646

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 9 submitters

gnomAD v4.1

Rare

low-frequency (popmax 3.5%, afr)

Conditions

Cardiovascular phenotype

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 -0.86	GERP -2
Overall
CADD	9.026	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 3.5% African / African-American · 2,626/74,980 alleles

Filtering AF 3.39% ClinGen BA1/BS1 input FAF95, joint · FAF99 3.35%

Overall 0.18% 2,898/1,613,990 alleles · low-frequency

Ancestry group	Frequency	1 in
African / African-Americangrpmax	3.5%	29
Remaining individualsnot grpmax-eligible	0.192%	521
Admixed American	0.18%	555
Middle Eastern	0.149%	673
South Asian	0.00549%	18,213
European (non-Finnish)	0.00254%	39,333

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: CACNB2
Protein: p.Arg506=
Coding: c.1518C>T
MANE Select: NM_201596
dbSNP: rs34813638
Type: single nucleotide variant
Location: chr10:18539259 (GRCh38)
Gene constraint: LOEUF 0.77 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 65.78 · 3 PDB
Residue 506: the 'disordered' region

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

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Brugada syndrome 4

Similar variants

CACNB2 p.Arg506Cys Uncertain significance ★★ ⚠ same residue
CACNB2 p.Arg506His Uncertain significance ★★ same residue
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

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-arg506 (accessed [today's date]).

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