Huntington’s disease, spinocerebellar ataxia type 1 (SCA1), SCA2, SCA3, SCA6, SCA7, SCA17, spinal and bulbar muscular atrophy, and dentatorubropallidoluysian atrophy are classified as polyQ diseases24. This evidence concerns the gene ATXN7 and spinocerebellar ataxia type 1.