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© Research
Publication : Cell

KCNQ4, a novel potassium channel expressed in sensory outer hair cells, is mutated in dominant deafness

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Cell - 05 Feb 1999

Kubisch C, Schroeder BC, Friedrich T, Lütjohann B, El-Amraoui A, Marlin S, Petit C, Jentsch TJ

Link to Pubmed [PMID] – 10025409

Cell 1999 Feb;96(3):437-46

Potassium channels regulate electrical signaling and the ionic composition of biological fluids. Mutations in the three known genes of the KCNQ branch of the K+ channel gene family underlie inherited cardiac arrhythmias (in some cases associated with deafness) and neonatal epilepsy. We have now cloned KCNQ4, a novel member of this branch. It maps to the DFNA2 locus for a form of nonsyndromic dominant deafness. In the cochlea, it is expressed in sensory outer hair cells. A mutation in this gene in a DFNA2 pedigree changes a residue in the KCNQ4 pore region. It abolishes the potassium currents of wild-type KCNQ4 on which it exerts a strong dominant-negative effect. Whereas mutations in KCNQ1 cause deafness by affecting endolymph secretion, the mechanism leading to KCNQ4-related hearing loss is intrinsic to outer hair cells.

https://www.ncbi.nlm.nih.gov/pubmed/10025409