Spinocerebellar ataxia type 3 (SCA3), also known as Machado–Joseph disease, is the most common dominantly inherited form of degenerative ataxia, caused by an expanded CAG repeat in the ATXN3 gene and marked by irreversible decline in motor function already in mid‐life (Costa Mdo & Paulson, 2012; Rub et al, 2013). This evidence concerns the gene ATXN3 and Spinocerebellar ataxia type 3.