Association of microRNA gene polymorphisms with recurrent spontaneous abortion: An updated meta‑analysis.

Numerous studies have reported single nucleotide polymorphisms (SNPs) in microRNAs (miRNAs) associated with unexplained recurrent spontaneous abortion (URSA). The present study aimed to conduct an updated meta-analysis to confirm a pooled effect size of the association between miRNA SNPs and URSA. The relevant literature was searched on PubMed, EMBASE, Web of Science and Cochrane Library before July 2022 to identify case-control studies. The pooled odds ratio and confidence intervals at 95% of the eligible studies were extracted and evaluated under five genetic models. A total of 18 studies involving 3,850 cases and 4,312 controls were included. miR499a rs3746444 A>G, miR-149 rs2292832 T>C, miR-125a rs41275794 G>A and miR-10a rs3809783 A>T may enhance the risk of recurrent spontaneous abortion (RSA) under various genetic models. Although no separate association was found between the miR-125a rs12976445 C>T and miR-27a rs895819 A>G polymorphisms and RSA, statistical significance was found in certain ethnic groups only. The current analysis suggests a high significance of an up-to-date meta-analysis for screening out and preventing URSA among high-risk women by testing miRNA SNPs and RSA susceptibility.