KCNC2 and spinocerebellar ataxia type 13: Variants in KCNC3 (KV3.3), a member of the same subfamily closely related to KCNC2, have previously been associated with SCA13 (Herman‐Bert et al., 2000; Parolin Schnekenberg et al., 2015; Pyle et al., 2015; Waters et al., 2005, 2006).