Is CACNA2D2 p.Arg12Trp (c.34C>T) pathogenic?

CACNA2D2 p.Arg12Trp (c.34C>T) is classified Uncertain significance in CACNA2D2 (ClinVar, Single submitter, 1 submitter; last evaluated 2020-02-06). AlphaMissense: likely benign (0.2053); Absent from gnomAD v4.1; Associated with early-infantile DEE.

What condition is associated with CACNA2D2 p.Arg12Trp (c.34C>T)?

CACNA2D2 p.Arg12Trp (c.34C>T) is associated with early-infantile DEE (ClinVar).

How common is CACNA2D2 p.Arg12Trp (c.34C>T) in the general population?

CACNA2D2 p.Arg12Trp (c.34C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CACNA2D2 p.Arg12Trp (c.34C>T)?

AlphaMissense predicts likely benign (score 0.2053) — an in-silico prediction, not a clinical call.

CACNA2D2 p.Arg12Trp

c.34C>T · rs1274971927 · VCV1017036

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2053 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 242,118)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

early-infantile DEE

Computational evidence

Protein change
AlphaMissense	0.2053	likely benign
REVEL	0.051	moderately benign-leaning
SaProt	LLR -8.41	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.8	GERP -0.009, phastCons 1
Regional constraint	o/e 0.72	unconstrained · MANE · 137 kb · p 1.1e-21 · regional, not allelic
Overall
CADD	21.7	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 242,118). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CACNA2D2
Protein: p.Arg12Trp
Coding: c.34C>T
MANE Select: NM_006030
dbSNP: rs1274971927
Type: single nucleotide variant
Location: chr3:50503390 (GRCh38)
Gene constraint: LOEUF 0.396 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 81.48
Residue 12: the 'disordered' region

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.Arg12Gly 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
CACNA2D2 p.Arg188Ser 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-arg12trp (accessed [today's date]).

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