The FXTAS phenotype is found in 30% of male carriers and 11–18% of female carriers of the FMR1-premutation and is characterized primarily by intention tremors and cerebellar gait ataxia, and in severe cases accompanied by executive function, memory deficits and Parkinsonism (Jacquemont, 2004; Leehey et al., 2016; Robertson et al., 2016). The gene discussed is FMR1; the disease is fragile X-associated tremor/ataxia syndrome.