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. The gene discussed is ATXN3; the disease is spinocerebellar ataxia type 1.