Mutations in the FMR1 gene due to the CGG repetition can result in several conditions, e.g., ID, FXPOI, FXTAS, autism, Parkinson’s disease, developmental delays, other cognitive deficits, and even fragile X-associated neuropsychiatric disorders (FXAND) [53, 76, 77]. The gene discussed is FMR1; the disease is fragile X-associated tremor/ataxia syndrome.