<prompt> All of the following are neurologic channelopathies, except :Hypokalemic periodic paralysisEpisodic ataxiasFamilial hemiplegic migraineHuntingtons disease  <response>: Answer is D Huntingtons disease: Huntingtons disease is not a channelopathy. Huntingtons disease is an autosomal dominant disorder caused by mutations in the Huntingtons gene on the sho arm of chromosome 4, specifically in an expanding and unstable polyglutamine repeat sequence CAG. The gene encodes for protein Huntington which is present in all neurons. Channelopathies: Refers to a group of disorders caused by affection of muscle membrane excitability. Neurologic Channelopathies : Category Disorder Channel type Ataxias Episodic ataxia -1 Episodic ataxia - 2 Spinocerebellar ataxia - 6 K Ca Ca Migraine Familial hemiplegic migraine Ca Epilepsy Benign neonatal familial convulsions Generalised epilepsy with febrile convulsions plus K Na Periodic paralysis Hyperkalemic periodic paralysis Hypokalemic periodic paralysis Na Ca Myotonia Myotonia congenital Paramyotonia congenital Cl Na Deafness Jorvell and Lange-Nielsen syndrome deafness, prolonged QT interval, and arrhythmia Autosomal dominant progressive deafness K K 