Abstract
A meta-analyses of endothelial nitric oxide synthase (eNOS) and angiotensin-converting enzyme (ACE) gene polymorphisms in pre-eclampsia was performed. We shortlisted 33 studies (17 for ACE; 16 for eNOS gene polymorphisms), of which 29 articles (16 for ACE and 15 for eNOS) were analysed. Overall, 1,620 cases with pre-eclampsia and 2,158 controls were analysed for intron 16 insertion–deletion polymorphism in ACE gene. A total of 1,610 subjects with pre-eclampsia and 2,875 controls were analysed for the Glu298Asp in eNOS gene. Overall, the random-effects odds ratio (OR) with Glu298Asp in eNOS gene was 0.958 (95% confidence intervals, CI 0.747–1.228, p > 0.05), and for the insertion–deletion/ACE polymorphism was 0.987 (95% CI 0.698–1.395, p > 0.05). Significant heterogeneity was observed in the studies that evaluated polymorphisms in ACE (Q value = 55.6; I2 = 73; p value = 0.000); and eNOS (Q value = 37.2; I2 = 62.4; p value = 0.001) polymorphisms. No significant risk of pre-eclampsia was observed in both eNOS and ACE genes with these polymorphisms.
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