ATXN2 and amyotrophic lateral sclerosis: ATXN2 expansions associated with ALS were reported by Corrado et al. to be interrupted by at least one CAA triplet [16], Yu et al. identified ATXN2 expansions in 40 ALS patients to be always interrupted by CAA triplets, and defined a haplotype of two ATXN2 SNPs (rs695871 and rs695872) in common between most cases with 3 CAA interruptions and another haplotype in common between most cases with 1–3 CAA interruptions [34], [35].