Preeclampsia is considered to be a multifactorial and multisystemic disorder with a genetic predisposition. Alterations in the renin-angiotensin system are considered to play a significant role in the pathogenesis of the disease. In order to investigate the possible association of the three most common polymorphisms of the renin-angiotensin system genes with preeclampsia we have examined 41 women with preeclampsia and 102 normotensive pregnant women. DNA samples were genotyped for the M235T polymorphism of the angiotensinogen gene (AGT), the insertion/deletion (I/D) polymorphism of the angiotensin-converting enzyme gene (ACE) and the A1166C polymorphism of the angiotensin II type 1 receptor gene (AT1R) by PCR. Allele and genotype frequencies of the AGT gene polymorphism differed between the two study groups. The TT genotype of the M235T polymorphism was significantly increased in women who developed preeclampsia (P<0.02). In addition, women with preeclampsia and TT genotype had more frequently the DD genotype or the 1166C allele than the control group showing a significant interaction between the genes. In conclusion, we found an association between the angiotensinogen variant 235T and preeclampsia as well as an interaction between the variant 235T and the two other genes studied.
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