Circulating microRNAs in follicular fluid, powerful tools to explore in vitro fertilization process

Area of Science:

• Reproductive biology
• Biomarker discovery
• Genomics

Background:

• Circulating microRNAs (miRNAs) are recognized as potential biomarkers for various diseases.
• Their role in female infertility and in vitro fertilization (IVF) outcomes remains largely unexplored.
• Polycystic ovary syndrome (PCOS) is a common cause of female infertility impacting IVF success.

Purpose of the Study:

• To investigate the expression profiles of specific circulating miRNAs in human follicular fluid.
• To assess the potential of these miRNAs as biomarkers for distinguishing PCOS from normal ovarian reserve.
• To evaluate the ability of follicular fluid miRNAs to predict IVF outcomes, including oocyte yield, blastocyst development, and clinical pregnancy.

Main Methods:

• Expression profiling of five selected miRNAs (let-7b, miR-29a, miR-30a, miR-140, miR-320a) in human follicular fluid.
• Analysis of samples from 91 women with normal ovarian reserve and 30 with PCOS.
• Statistical analysis including ROC curve analysis to determine diagnostic and predictive accuracy.

Main Results:

• A combination of miR-30a, miR-140, and let-7b effectively discriminated between PCOS and normal ovarian reserve (AUC=0.83).
• Lower levels of miR-320a were associated with a reduced number of mature oocytes.
• let-7b predicted blastocyst development, and miR-29a showed potential in predicting clinical pregnancy.
• Specific miRNAs demonstrated significant diagnostic and predictive capabilities for IVF outcomes.

Conclusions:

• Follicular fluid miRNAs, including let-7b, miR-29a, miR-30a, miR-140, and miR-320a, show promise as biomarkers in reproductive medicine.
• These miRNAs can aid in the diagnosis of PCOS and prediction of IVF success.
• Further research could lead to personalized medical strategies for patients undergoing IVF.