Lauerer et al. (Acta Neuropathol Commun 13:157, 2025) recently investigated the role of ATXN2 variants, including intermediate CAG repeats and a 9-bp duplication, in spinocerebellar ataxia type 3 (SCA3). The gene discussed is ATXN2; the disease is Spinocerebellar ataxia type 3.