The mutant FMR1 gene with 50–200 CGG repeats also causes Fragile X-associated tremor/ataxia syndrome (FXTAS), a late-onset neurodegenerative disorder that includes cerebellar ataxia, Parkinsonism, memory and executive dysfunction, autonomic dysfunction and other cognitive declines7,8. The gene discussed is FMR1; the disease is fragile X-associated tremor/ataxia syndrome.