To date, nine disorders have been reported, including spinal and bulbar muscular atrophy (SBMA), Huntington’s disease (HD), several spinocerebellar ataxias (SCA1, SCA2, SCA3, SCA6, SCA7, and SCA17), and dentatorubral pallidoluysian atrophy (DRPLA)95. This evidence concerns the gene CACNA1A and dentatorubral-pallidoluysian atrophy.