ATXN2 and spinocerebellar ataxia type 2: Normal repeat length varies between 14 and 29 glutamines (most individuals have 22Q) [3], and intermediate length alleles (27–33Q) are associated with amyotrophic lateral sclerosis (ALS) [4] and a length of more than 32Q results in SCA2 [5], while most SCA2 patients show expanded repeats between 36 and 52, respectively [6, 7], and rare expansions beyond 800Q were observed [8].