ATXN3 and Parkinson disease: These conditions encompass a range of disorders including Parkinson’s disease (PD), Alzheimer’s disease (AD), tauopathies, amyotrophic lateral sclerosis (ALS), and polyglutamine (polyQ) expansion disorders such as Huntington’s disease (HD) and various spinocerebellar ataxias (SCAs) such as SCA3 [1].