Human Reproduction, Vol. 14, No. 7, 1872-1874,
July 1999
© 1999 European Society of Human Reproduction and Embryology
The factor V Leiden mutation in Japanese couples with recurrent spontaneous abortion
1 Department of Obstetrics and Gynecology, Case Western Reserve University at Metro Health Medical Center, 2500 Metro Health Drive, Cleveland, OH 44109–1998, USA, 2 Department of Obstetrics and Gynecology, Faculty of Medicine, Osaka University 2–2, Yamadaoka, Suita, Osaka, 565-0871, 3 Department of Obstetrics and Gynecology, Osaka Police Hospital, 10–31 Kitayama-cho, Tennouji-ku, Osaka 543-8502 and 4 Shimizu Women's Clinic, 2–2–4 Minamiguchi, Takarazuka, Hyogo, 665-0011, Japan
Thrombosis of placental vessels can be a major cause of recurrent spontaneous abortion (RSA). The factor V Leiden (FVL) mutation, a single point mutation in the factor V gene, is the most common genetic predisposition to thrombosis in European countries and the United States. However, even among Caucasian populations, the association between the FVL mutation and RSA is still controversial. The objectives of the present study were to investigate the prevalence of the FVL mutation in Japanese women who have experienced RSA and to clarify the contribution of the FVL mutation to recurrent miscarriages. A total of 52 Japanese women with a history of three or more consecutive idiopathic first trimester miscarriages and 41 of their male partners were studied. The control group consisted of 55 parous women without obstetric complications. Peripheral blood cell DNA was examined for the presence of the FVL alleles by polymerase chain reaction with Mnl I restriction fragment length polymorphisms. None of the 52 women with RSA and the 41 partners carried the mutation. We also found no subject carrying the FVL alleles in the control group. These results suggest that the FVL alleles are not concentrated in women with RSA at least to clinically significant levels and that there is no apparent association between the FVL mutation and RSA in our Japanese population.
Key words: factor V Leiden mutation/recurrent spontaneous abortion
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