Is KCND2 p.Arg296= (c.886C>A) pathogenic?

KCND2 p.Arg296= (c.886C>A) is classified Likely benign in KCND2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-19). Ultra-rare (popmax 0.0154%, sas); Associated with Early Myoclonic Encephalopathy.

What condition is associated with KCND2 p.Arg296= (c.886C>A)?

KCND2 p.Arg296= (c.886C>A) is associated with Early Myoclonic Encephalopathy (ClinVar).

How common is KCND2 p.Arg296= (c.886C>A) in the general population?

KCND2 p.Arg296= (c.886C>A) is ultra-rare (popmax 0.0154%, sas) (gnomAD).

KCND2 p.Arg296=

c.886C>A · VCV4694153

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0154%, sas)

Conditions

Early Myoclonic Encephalopathy

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 2.2	GERP 1.8, phastCons 1
Overall
CADD	11.47	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0154% South Asian · 14/90,872 alleles

Filtering AF 0.00922% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00737%

Overall 0.00118% 19/1,611,198 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0154%	6,491
African / African-American	0.00671%	14,905

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: KCND2
Protein: p.Arg296=
Coding: c.886C>A
MANE Select: NM_012281
Type: single nucleotide variant
Location: chr7:120275518 (GRCh38)
Gene constraint: LOEUF 0.428 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 72.28 · 16 PDB
Residue 296: an α-helix

Full KCND2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Early Myoclonic Encephalopathy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

KCND2 p.Arg296Gln Uncertain significance ★ ⚠ same residue
KCND2 p.Pro403Ala Pathogenic/Likely pathogenic ★★ same condition
KCND2 c.1374+3A>G Uncertain significance ★★ same condition
KCND2 c.1468-3C>T Uncertain significance ★★ same condition
KCND2 p.Ala321Val Uncertain significance ★★ ⚠ same condition
KCND2 p.Ala399Ser Uncertain significance ★★ ⚠ same condition
KCND2 p.Arg147His Uncertain significance ★★ ⚠ same condition
KCND2 p.Arg533Ter 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/kcnd2-p-arg296 (accessed [today's date]).

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