The product of the FMR1 gene, fragile X mental retardation protein (FMRP), plays an important role in the regulation of the translation of the dendritic messenger ribonucleic acid (mRNA) molecules in response to the activation of synapses (16-17), indicating that the lack of this protein was associated with mental retardation in males with FXS (18). Here, FMR1 is linked to fragile X syndrome.