Is CACNA2D2 p.Pro27= (c.81C>T) pathogenic?

CACNA2D2 p.Pro27= (c.81C>T) is classified Likely benign in CACNA2D2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-18). Rare (popmax 0.112%, sas); Associated with early-infantile DEE.

What condition is associated with CACNA2D2 p.Pro27= (c.81C>T)?

CACNA2D2 p.Pro27= (c.81C>T) is associated with early-infantile DEE (ClinVar).

How common is CACNA2D2 p.Pro27= (c.81C>T) in the general population?

CACNA2D2 p.Pro27= (c.81C>T) is rare (popmax 0.112%, sas) (gnomAD).

CACNA2D2 p.Pro27=

c.81C>T · rs576728531 · VCV2047167

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

rare (popmax 0.112%, sas)

Conditions

early-infantile DEE

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 0.71	GERP 1.2, phastCons 0.36
Overall
CADD	12.44	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.112% South Asian · 9/8,020 alleles

Filtering AF 0.0585% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0437%

Overall 0.00254% 9/354,488 alleles · rare exomes 4/204,622 · genomes 5/149,866 · joint denominator

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.Pro27=
Coding: c.81C>T
MANE Select: NM_006030
dbSNP: rs576728531
Type: single nucleotide variant
Location: chr3:50503343 (GRCh38)
Gene constraint: LOEUF 0.396 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 81.48
Residue 27: 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 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
CACNA2D2 p.Arg422Cys 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-pro27 (accessed [today's date]).

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