Evaluation of the human fragile X mental retardation 1 polymerase chain reaction reagents to amplify the FMR1 gene: testing in a clinical diagnostic laboratory.

Abstract excerpt

Fragile X syndrome (FXS) is caused by the absence of a functional fragile X mental retardation protein (FMRP). In most cases, the molecular mutation is an expansion and consequent methylation of the CGG trinucleotide repeat in the 5' end of the FMR1 gene. Polymerase chain reaction (PCR)-based assays that overcome the limitations of amplifying >100-150 CGG repeats have been designed. One such product, Human FMR1...

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