J Genet Med.  2009 Dec;6(2):155-160.

Tumor Necrosis Factor-alpha Gene Polymorphism (C-850T) in Korean Patients with Preeclampsia

  • 1Laboratory of Medical Genetics, Cheil General Hospital and Women's Healthcare Center, Seoul, Korea. hmryu@yahoo.com
  • 2Department of Obstetrics and Gynecology, Cheil General Hospital and Women's Healthcare Center, Kwandong University College of Medicine, Seoul, Korea.
  • 3Division of Cardiovascular Disease, Center for Biomedical Sciences, National Institute of Health, Seoul, Korea.
  • 4Department of Obstetrics and Gynecology, MokDong Hospital, Ewha Womans University, College of Medicine, Seoul, Korea.


Preeclampsia is a multisystem human pregnancy-specific disorder. The pathophysiology of preeclampsia is linked with over-stimulation of inflammatory cytokines by placental ischemia via reduced uterine perfusion pressure during pregnancy. Although an increase in tumor necrosis factor (TNF)-alpha has been reported in preeclamptic women, there is little evidence of a relationship between TNF-alpha gene variations and preeclampsia. In this study, we identified a single-nucleotide polymorphism (SNP), C-850T, in the TNF-alpha gene promoter region in Korean preeclamptic women and investigated the association between this SNP and the development of preeclampsia.
This polymorphism was analyzed in peripheral blood samples from 198 preeclamptic pregnancies and 194 normotensive pregnancies using a SNapShot kit and an ABI Prism 3100 Genetic analyzer.
Genotypes and allele frequencies for C-850T did not differ between preeclamptic and normotensive pregnancies. The distributions of genotypes (CC, CT and TT) were 74.3%, 22.2% and 3.5%, respectively, in preeclamptic pregnancies, and 71.6%, 25.8% and 2.6%, respectively, in normotensive pregnancies. The frequencies of the C and T alleles were 0.85 and 0.15 in preeclamptic pregnancies and 0.84 and 0.16 in normotensive pregnancies, respectively. There was no increased risk of preeclampsia in subjects with the CT (OR, 0.83; P=0.44) or TT genotypes (OR, 1.32; P=0.64).
We found no differences in the genotypes or allele frequencies of the TNF-alpha gene polymorphism between preeclamptic and normotensive pregnancies. This study suggests that the TNF-alpha gene polymorphism may be not associated with the development of preeclampsia in pregnant Korean women.


Tumor necrosis factor-alpha; Polymorphism; Preeclampsia
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