KCNA1 and Ataxia: Furthermore, mutations in the most common genes associated with EA, namely in the CACNA1A gene (associated with EA type 2) and KCNA1 (associated with EA type 1) might lead to different clinical entities without episodes of vertigo/ataxia, such as epilepsy, paroxysmal dyskinesia, or hemiplegic migraine (4, 6, 21, 23).