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Montréal, Canada

Lafreniere R.G.,University of Montreal | Cader M.Z.,University of Oxford | Poulin J.-F.,Emerillon Therapeutics | Andres-Enguix I.,University of Oxford | And 15 more authors.
Nature Medicine

Migraine with aura is a common, debilitating, recurrent headache disorder associated with transient and reversible focal neurological symptoms 1. A role has been suggested for the two-pore domain (K2P) potassium channel, TWIK-related spinal cord potassium channel (TRESK, encoded by KCNK18), in pain pathways and general anaesthesia2. We therefore examined whether TRESK is involved in migraine by screening the KCNK18 gene in subjects diagnosed with migraine. Here we report a frameshift mutation, F139WfsX24, which segregates perfectly with typical migraine with aura in a large pedigree. We also identified prominent TRESK expression in migrainesalient areas such as the trigeminal ganglion. Functional characterization of this mutation demonstrates that it causes a complete loss of TRESK function and that the mutant subunit suppresses wild-type channel function through a dominantnegative effect, thus explaining the dominant penetrance of this allele. These results therefore support a role for TRESK in the pathogenesis of typical migraine with aura and further support the role of this channel as a potential therapeutic target. © 2010 Nature America, Inc. All rights reserved. Source

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