The family comprises nine genetic neurodegenerative disorders: Huntington’s disease, spinal and bulbar muscular atrophy (SBMA), dentatorubral-pallidoluysian atrophy (DRPLA), SCA1, SCA2 SCA3, SCA6, SCA7, and SCA17 (Mohan et al., 2014a; Stoyas and La Spada, 2018). Here, CACNA1A is linked to Kennedy disease.