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Recurrent pregnancy loss (RPL), which is defined as two pregnancy losses that occur before 20 weeks of gestation, is relatively common, occurring in approximately 1-5% of women. The underlying cause is often unclear, although numerous factors may contribute to RPL, including environmental and immunological factors, blood coagulation disorders, and genetics. In particular, single nucleotide variants have been associated with RPL, including those found in microRNAs (miRNAs). We investigated the association between four miRNA polymorphisms, miR-25T&gt;C, miR-32C&gt;A, miR-125aC&gt;T, and miR-222G&gt;T, and RPL in a cohort consisting of 361 RPL patients and 272 controls. Subjects were genotyped at miRNA loci by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis, and genotype frequencies were calculated. We then performed allele and genotype combination analyses and measured the association between miRNA polymorphisms and clinical variables in both RPL patients and controls. We detected a statistically significant association between RPL and the miR-25T/miR-32C/miR-125aT/miR-222T allele combination (adjusted odds ratio (AOR), 4.361; 95% confidence interval (CI), 1.496-12.72; P =0.003). Three-gene combinations, including miR-32C/miR-125aT/miR-222T (AOR, 3.085; 95% CI, 1.254-7.588; P =0.010) and miR-25T/miR-125aT/miR-222T (AOR, 2.929; 95% CI, 1.183-7.257; P= 0.015), and the two-gene combination miR-125aT/miR-222T (AOR, 2.417; 95% CI, 1.084-5.386; P= 0.026) were also associated with RPL. Analysis of variance (ANOVA) revealed that platelet counts and blood urea nitrogen levels were significantly different in RPL patients expressing different miR-125aC&gt;T and miR-25T&gt;C genotypes, respectively ( P &lt;0.05). In addition, creatinine levels were lower in RPL patients expressing the minor alleles miR-25T&gt;C and miR-32C&gt;A. We investigated miRNAs (miR-25, miR-32, miR-125a, miR-222) in RPL patients and healthy controls. Significantly different allele frequencies were detected by ANOVA. We suggest that miRNAs and clinical factors can impact RPL occurrence.

genes

Study of the Association between microRNA (miR-25T&gt;C, miR-32C&gt;A, miR-125C&gt;T, and miR-222G&gt;T) Polymorphisms and the Risk of Recurrent Pregnancy Loss in Korean Women