Methylenetetrahydrofolate reductase polymorphisms at 3'-untranslated region are associated with susceptibility to preterm birth

Translational Pediatrics
Qin ZhuHong Li

Abstract

Etiology and mechanism of preterm birth (PTB) is complicated. Genetic susceptibility is one of the key factors involved in the pathogenic mechanism underlying PTB. A subset of single nucleotide polymorphisms (SNPs) selected by bioinformatics approach from 3'-untranslated region (3'-UTR) of methylenetetrahydrofolate reductase (MTHFR) gene were subjected to SNaPshot analysis in a case-control study. Three SNPs (rs45451599, rs1537515, rs1537516) were simultaneously tested in one tube, among 1,135 DNA samples including 480 PTBs and 655 term controls. Two perfectly correlated (r(2)=1) SNPs, rs1537515 and rs1537516, were found significantly associated with PTB susceptibility [P=0.012; OR: 0.65; 95% confidence interval (CI), 0.47-0.91]. The frequencies of the minor alleles were lower in PTB cases than in controls, which the frequencies were 0.066 in PTB cases and 0.095 in controls. G and T allele frequencies of rs1537515 were the same with rs1537516 (P=0.011; OR: 0.666; 95% CI, 0.49-0.91). Rs45451599 was not found associated with PTB (P=0.52; OR: 0.76; 95% CI, 0.33-1.74). The 18-25 nucleotides in length of microRNAs (miRNAs) which can regulate gene expressions are involved in binding partial complementary sequences within 3'-UTR. The ...Continue Reading

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