title: Genetic defects in the hotspot of inwardly rectifying K(+) (Kir) channels and their metabolic consequences: a review.
abstract: Inwardly rectifying potassium (Kir) channels are essential for maintaining normal potassium homeostasis and the resting membrane potential. As a consequence, mutations in Kir channels cause debilitating diseases ranging from cardiac failure to renal, ocular, pancreatic, and neurological abnormalities. Structurally, Kir channels consist of two trans-membrane domains, a pore-forming loop that contains the selectivity filter and two cytoplasmic polar tails. Within the cytoplasmic structure, clusters of amino acid sequences form regulatory domains that interact with cellular metabolites to control the opening and closing of the channel. In this review, we present an overview of Kir channel function and recent progress in the characterization of selected Kir channel mutations that lie in and near a C-terminal cytoplasmic 'hotspot' domain. The resultant molecular mechanisms by which the loss or gain of channel function leads to organ failure provide potential opportunities for targeted therapeutic interventions for this important group of channelopathies.
authors.affiliation: Department of Pediatrics, University of Wisconsin, Madison, USA. bikashp@pediatrics.wisc.edu
authors.forename: Bikash R
authors.initials: BR
authors.lastname: Pattnaik
authors.forename: Matti P
authors.initials: MP
authors.lastname: Asuma
authors.forename: Ryan
authors.initials: R
authors.lastname: Spott
authors.forename: De-Ann M
authors.initials: DA
authors.lastname: Pillers
mesh_terms: D000595:Amino Acid Sequence; D006801:Humans; D015640:Ion Channel Gating; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D024661:Potassium Channels, Inwardly Rectifying / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*
chemical_list: D024661:Potassium Channels, Inwardly Rectifying
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