Journal
NEURON
Volume 58, Issue 6, Pages 859-870Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2008.04.016
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Funding
- NHLBI NIH HHS [R01 HL061657-09, R01 HL061657] Funding Source: Medline
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K-2P channels mediate potassium background currents essential to central nervous system function, controlling excitability by stabilizing membrane potential below firing threshold and expediting repolarization. Here, we show that alternative translation initiation (AT[) regulates function of K(2P)2.1 (TREK-1) via an unexpected strategy. Full-length K(2P)2.1 and an isoform lacking the first 56 residues of the intracellular N terminus (K(2)P2.1 Delta 1-56) are produced differentially in a regional and developmental manner in the rat central nervous system, the latter passing sodium under physiological conditions leading to membrane depolarization. Control of ion selectivity via ATI is proposed to be a natural, epigenetic mechanism for spatial and temporal regulation of neuronal excitability.
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