[Potassium channels, genetic and acquired diseases]

INTRODUCTION: K(+) channels allow the passive and selective transport of K(+) ions through the membranes. They control K(+) homeostasis, neuronal and muscular excitabilities, and neurotransmitter and hormone release. EXEGESIS: K(+) channels are composed of pore-forming subunits associated with regulatory subunits. Many different K(+) channels have been identified. CONCLUSION: This diversity is stressed by the growing number of genetic and acquired diseases associated with these channels.