Is KCND2 p.Pro568= (c.1704T>G) pathogenic?

KCND2 p.Pro568= (c.1704T>G) is classified Likely benign in KCND2 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-11-13). Absent from gnomAD v4.1; Associated with Early Myoclonic Encephalopathy.

What condition is associated with KCND2 p.Pro568= (c.1704T>G)?

KCND2 p.Pro568= (c.1704T>G) is associated with Early Myoclonic Encephalopathy (ClinVar).

How common is KCND2 p.Pro568= (c.1704T>G) in the general population?

KCND2 p.Pro568= (c.1704T>G) is absent from gnomAD v4.1 (gnomAD).

KCND2 p.Pro568=

c.1704T>G · rs2116190590 · VCV1147038

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

Early Myoclonic Encephalopathy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.07	moderately benign-leaning
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -3.8	GERP -5.9
Overall
CADD	0.296	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: KCND2
Protein: p.Pro568=
Coding: c.1704T>G
MANE Select: NM_012281
dbSNP: rs2116190590
Type: single nucleotide variant
Location: chr7:120746016 (GRCh38)
Gene constraint: LOEUF 0.428 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 72.28 · 16 PDB
Residue 568: the 'important for normal channel activation and inactivation, for interaction with kcnip2, and probably other family members as well' region

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.Pro568Thr 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-pro568 (accessed [today's date]).

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