NCIt definition : Human FMR1 wild-type allele is located in the vicinity of Xq27.3 and is approximately
39 kb in length. This allele, which encodes fragile X mental retardation protein 1,
may play a role in the mediation of mRNA transport. Amplification of a trinucleotide
repeat (CGG) within the gene is associated with fragile X syndrome.;
NCIt note : Fragile X tremor/ataxia syndrome results from the occurrence of 55-200 repeats of
the CGG sequence while having over 200 repeats of the trinucleotide results in the
more severe fragile X syndrome with mental retardation.;