Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder caused by expanded CGG (CGGexp) trinucleotides in the 5′-untranslated region (5′UTR) of the FMR1 gene (Hagerman and Hagerman, 2016; Boivin et al., 2017). The gene discussed is FMR1; the disease is fragile X-associated tremor/ataxia syndrome.