Among the X-linked ataxias, fragile X-associated tremor/ataxia syndrome (FXTAS), caused by a CGG repeat expansion in the premutation range in the 5′ non-coding region of the fragile X messenger ribonucleoprotein 1 (FMR1) gene is the most common [7]. This evidence concerns the gene FMR1 and fragile X-associated tremor/ataxia syndrome.