KCNE3

Chr 11

potassium voltage-gated channel subfamily E regulatory subunit 3

Also known as: BRGDA6, HOKPP, HYPP, MiRP2

NCBI Gene: 10008 ENSG00000175538 UniProt: Q9Y6H6

Voltage-gated potassium (Kv) channels represent the most complex class of voltage-gated ion channels from both functional and structural standpoints. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume. This gene encodes a member of the potassium channel, voltage-gated, isk-related subfamily. This member is a type I membrane protein, and a beta subunit that assembles with a potassium channel alpha-subunit to modulate the gating kinetics and enhance stability of the multimeric complex. This gene is prominently expressed in the kidney. A missense mutation in this gene is associated with hypokalemic periodic paralysis. [provided by RefSeq, Jul 2008]

Primary Disease Associations & Inheritance

UniProtBrugada syndrome 6

133

ClinVar variants

Pathogenic / LP

0.47

pLI score

Active trials

Clinical Summary— KCNE3

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Gene-Disease Validity (ClinGen)

Brugada syndrome · ADDisputed

Disputed — evidence questions this relationship

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Population Constraint (gnomAD)

Constrained for loss-of-function variants (OE-LoF 0.00) despite low pLI — interpret in context.

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ClinVar Variants

8 Pathogenic / Likely Pathogenic· 71 VUS of 133 total submissions

Some data sources returned errors (1)

omim: Error: OMIM fetch failed: 429

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

gnomAD

Tolerant — LoF & missense variants common in population

LoF Constraint?LOEUF (Loss-of-function Observed/Expected Upper bound Fraction) is the upper bound of the 90% CI for LoF OE — the preferred gnomAD v4 metric. Lower = more intolerant to LoF. LOEUF < 0.35 = highly constrained.

1.49LOEUF

pLI 0.468

Z-score 1.19

OE 0.00 (0.00–1.49)

Tolerant

Highly tolerant — LoF variants common in population

Missense Constraint?Missense Z-score: standard deviations fewer missense variants observed vs. expected. Z > 3.09 (p < 0.001) = gene does not tolerate missense variation. OE missense < 0.6 is also considered constrained.

0.24Z-score

OE missense 0.92 (0.75–1.14)

62 obs / 67.5 exp

Tolerant

Mild missense constraint

Observed / Expected Ratios?Shaded band = 90% confidence interval. Vertical tick = point estimate. Grey threshold line = gnomAD constraint cutoff for that variant class.

LoF OE?Ratio of observed to expected LoF variants. Upper CI bound (LOEUF) ≤ 0.35 = strong LoF constraint signal.0.00 (0.00–1.49)

0≤0.351.4

Missense OE?Ratio of observed to expected missense variants. OE ≤ 0.6 = fewer missense variants than expected by chance.0.92 (0.75–1.14)

0≤0.61.4

Synonymous OE?Control metric — synonymous variants are largely neutral and expected near OE = 1.0. Significant deviation may indicate annotation issues.0.86

0≤1.21.6

LoF obs/exp: 0 / 1.7Missense obs/exp: 62 / 67.5Syn Z: 0.55