Analysis of the Fragile X Mental Retardation 1 Premutation in Han Chinese Women Presenting with Primary Ovarian Insufficiency

Abstract

Background: The aim of this study is to investigate the prevalence of the fragile X mental retardation 1 (FMR1) gene premutation in Han Chinese women with primary ovarian insufficiency (POI) using a rapid and cost-effective method. Methods: A total of 153 Han Chinese women with sporadic POI were systematically analyzed for trinucleotide repeats within the FMR1 gene. We employed an improved strategy to screen for cytosine-guanine-guanine repeats in the 5' untranslated region of the FMR1 gene. Before using the previously reported FragilEase polymerase chain reaction (PCR) method for premutation identification, we developed a new cost-effective PCR-based method to exclude most of the normal allele carriers during the initial screening stage. Results: In our initial screening, 62.1% of women with POI were found to carry heterozygous normal alleles of FMR1, which were recognized by our sensitive and cost-effective method. The remaining women were further screened for the presence of the FMR1 premutation. We identified a Han Chinese woman with a premutation allele of FMR1 out of 153 sporadic POI women (0.7%). Conclusions: The frequent FMR1 premutation in Caucasian individuals with POI may not be a common genetic cause of sporadic POI in the Han Chinese population.

Keywords

• Cytosine-guanine-guanine Repeats; Fragile X Mental Retardation 1 Premutation; Polymerase Chain Reaction; Primary Ovarian Insufficiency