Is CACNA2D2 p.Arg86= (c.258G>C) pathogenic?

CACNA2D2 p.Arg86= (c.258G>C) is classified Likely benign in CACNA2D2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-11-19). Very rare (popmax 0.00169%, amr); Associated with early-infantile DEE.

What condition is associated with CACNA2D2 p.Arg86= (c.258G>C)?

CACNA2D2 p.Arg86= (c.258G>C) is associated with early-infantile DEE (ClinVar).

How common is CACNA2D2 p.Arg86= (c.258G>C) in the general population?

CACNA2D2 p.Arg86= (c.258G>C) is very rare (popmax 0.00169%, amr) (gnomAD).

CACNA2D2 p.Arg86=

c.258G>C · rs920212073 · VCV1657348

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00169%, amr)

Conditions

early-infantile DEE

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 0.032	GERP -0.26, phastCons 0.83
Overall
CADD	9.302	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00169% Admixed American · 1/59,148 alleles

Filtering AF 8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 5.4e-05%

Overall 0.000374% 6/1,602,336 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00169%	59,148
African / African-American	0.00134%	74,778
European (non-Finnish)	0.00034%	293,764

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: CACNA2D2
Protein: p.Arg86=
Coding: c.258G>C
MANE Select: NM_006030
dbSNP: rs920212073
Type: single nucleotide variant
Location: chr3:50476148 (GRCh38)
Gene constraint: LOEUF 0.396 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 81.48

Full CACNA2D2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

early-infantile DEE — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CACNA2D2 p.Arg86Gln Uncertain significance ★ ⚠ same residue
CACNA2D2 p.Arg86Trp Uncertain significance ★ ⚠ same residue
CACNA2D2 c.2234+1G>A Likely pathogenic ★★ same condition
CACNA2D2 p.Gln519Ter Pathogenic/Likely pathogenic ★★ same condition
CACNA2D2 c.1907+3A>C Uncertain significance ★★ same condition
CACNA2D2 c.785-3C>T Uncertain significance ★★ same condition
CACNA2D2 p.Ala1096Thr Uncertain significance ★★ ⚠ same condition
CACNA2D2 p.Ala253Thr 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/cacna2d2-p-arg86 (accessed [today's date]).

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