MTHFR C677T Polymorphism and Factor V Leiden Mutation Are Not Associated with Recurrent Spontaneous Abortion of Unexplained Etiology in Japanese Women

 

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ABSTRACT

To determine whether the C677T polymorphism of the methylenetetrahydrofolate reductase (MTHFR) gene and the Leiden mutation of coagulation factor V (FV) are associated with recurrent spontaneous abortion (RSA) of unexplained etiology in Japanese participants, the genotypes of the two polymorphisms were determined and compared between cases of unexplained RSA and normal pregnant controls. Eighty-three Japanese participants, consisting of 45 women with explained RSA and 38 women with unexplained RSA, and 174 controls were recruited in the study. The frequencies of the T677 allele/TT genotype were not significantly different among women with explained RSA (35.6%/13.3%), women with unexplained RSA (34.2%/7.9%), primigravid controls (35.1%/11.7%), and multigravid controls (39.7%/16.5%). In the cases of unexplained RSA, the frequencies of the T677 allele and TT genotype tended to increase according to the number of previous spontaneous abortions, but the increase was without statistical significance: the frequencies of the T677 allele and TT genotype in women with two abortions were 18.2% and 0%, whereas in women with three abortions the frequencies were 38.0% and 9.5%, and in women with four or more abortions the frequencies were 50.0% and 16.7%, respectively. In addition, no Leiden mutation of FV was detected in the women with RSA or the controls. Neither T677 of the MTHFR nor the Leiden mutation of FV was associated with unexplained RSA in the Japanese population.

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 Dr.
Gen Kobashi

Department of Health for Senior Citizens, Hokkaido University Graduate School of Medicine

N15 W7, Sapporo 060-8638, Japan

Email: genkoba@med.hokudai.ac.jp