Prevalence of genetic mutations in protein S, protein C and antithrombin genes in Japanese patients with deep vein thrombosis |
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Authors: | Miyata Toshiyuki Sato Yukiko Ishikawa Junko Okada Hiromi Takeshita Satoshi Sakata Toshiyuki Kokame Koichi Kimura Rina Honda Shigenori Kawasaki Tomio Suehisa Etsuji Tsuji Hajime Madoiwa Seiji Sakata Yoichi Kojima Tetsuhito Murata Mitsuru Ikeda Yasuo |
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Institution: | a National Cardiovascular Center Research Institute, Suita, Japan b Department of Medicine, National Cardiovascular Center, Suita, Japan c Laboratory of Clinical Chemistry, National Cardiovascular Center,, Suita, Japan d Cardiovascular and Thoracic Surgery, Osaka University Graduate School of Medicine, Suita, Japan e Laboratory for Clinical Investigation, Osaka University Hospital, Suita, Japan f Division of Blood Transfusion and Cell Therapy, Kyoto Prefectural University of Medicine, Kyoto, Japan g Center for Molecular Medicine, Jichi Medical University, Shimotsuke, Japan h Department of Medical Technology, Nagoya University of School of Health Sciences, Nagoya, Japan i Department of Laboratory Medicine, Keio University, Tokyo, Japan j Department of Internal Medicine, Keio University, Tokyo, Japan |
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Abstract: | IntroductionGenetic deficiencies of PROS1, PROC, and SERPINC1 (antithrombin) are risk factors for deep vein thrombosis (DVT). Diagnosis of the inherited deficiencies of these three genes is sometimes difficult because of the phenotypic variability. This study was undertaken to reveal the frequency of nonsynonymous mutations of these three genes in Japanese DVT patients.Patients/MethodsOne hundred seventy-three DVT patients were registered by the Sub-group of Blood Coagulation Abnormality, from the Study Group of Research on Measures for Intractable Diseases. We sequenced the entire coding regions of the three genes in all DNA samples and identified the nonsynonymous mutations.Results and ConclusionsFor PROS1 we identified 15 nonsynonymous mutations in 28 DVT patients; for PROC, 10 nonsynonymous mutations in 17 patients; and for SERPINC1, 13 nonsynonymous mutations in 14 patients. Five patients had two mutations in PROS1 and PROC, and all of them had PROS1 K196E mutation. We previously identified one patient with a large PROS1 gene deletion. Thus, 55 out of 173 patients (32%) carried at least one genetic defect in the three genes. The PROS1 K196E mutation found in 15 Japanese DVT patients was the most prevalent. Mutations of PROC K193del and V339M were the second, each found in four patients. Our data suggested that the PROC K193del mutation caused the loss of the anticoagulant activity but not the amidolytic activity. Our effort is the first DNA resequencing study to identify the genetic variations in DVT patients without any consideration of their plasma activities and antigens. To minimize selection bias in a future evaluation of the contribution of genetic deficiency to DVT, we must recruit patients consecutively. |
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Keywords: | DVT deep vein thrombosis PCR polymerase chain reaction |
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