Association analysis of FMR1 genetic variants and primary ovarian insufficiency in South Indian women with a novel approach of CGG repeats classification

Komaravalli, Prasanna Latha; S, Vasantha Rani; Dalal, Ashwin; Jahan, Parveen

doi:10.1016/j.ejmg.2020.104081

Cited by 1 publication

(1 citation statement)

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“…The frequency of the premutation in our POI cohort is higher than in the general population, estimated at 0.7% for females and 0.2% for males in a large US population (Seltzer et al, 2012). Moreover, the frequency of FMR1 premutation in our cohort is comparable to what was reported in previous POI cohorts, ranging from 0.8% to 7.5% (Bachelot et al, 2009; Bretherick et al, 2005; Conway et al, 1998; Gersak et al, 2003; Wittenberger et al, 2007), although it seems to be lower in Asian (0.5% and 1.6%) compared to Caucasian (Ishizuka et al, 2011; Komaravalli et al, 2020; Lu et al, 2017). Regarding the gray zone expansion, the frequency observed in our study (2.10%) is lower than in a control US population [2.8% in females (98/3474) and 2.4% in males (78/3273)] but slightly higher than in another but smaller control population from Canada (1.64%, 3/182 females) (Bretherick et al, 2005).…”

Section: Discussionsupporting

confidence: 89%

Stratification of the risk of ovarian dysfunction by studying the complexity of intermediate and premutation alleles of the FMR1 gene

Quilichini,

Perol,

Cuisset

et al. 2023

American J of Med Genetics Pt A

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FMR1 premutation female carriers are at risk of developing premature/primary ovarian insufficiency (POI) with an incomplete penetrance. In this study, we determined the CGG repeat size among 1095 women with diminished ovarian reserve (DOR) / POI and characterized the CGG/AGG substructure in 44 women carrying an abnormal FMR1 repeat expansion number, compared to a group of 25 pregnant women carrying an abnormal FMR1 CGG repeat size. Allelic complexity scores of the FMR1 gene were calculated and compared between the two groups. In the DOR/POI cohort, 2.1% of women presented with an intermediate repeat size and 1.9% with a premutation. Our results suggest that the risk of POI is highest in the mid‐range of CGG repeats. We observed that the allelic score is significantly higher in POI women compared to the pregnant women group (p‐value = 0.02). We suggest that a high allelic score due to more than 2 AGG interspersions in the context of an intermediate number of repetitions could favor POI. Larger studies are still needed to evaluate the relevance of this new tool for the determination of the individual risk of developing POI in women with abnormal number of CGG repeats.

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