For example, fragile X-associated tremor/ataxia syndrome (FXTAS) is a neurodegenerative disease that affects premutation carriers (55–200 CGG repeats) in the FMR1 gene (Hagerman and Hagerman, 2016; Cabal-Herrera et al., 2020). Here, FMR1 is linked to fragile X-associated tremor/ataxia syndrome.