Angiotensin-converting enzyme insertion-deletion polymorphism in normotensive and pre-eclamptic pregnancies

Area of Science:

• Obstetrics and Gynecology
• Genetics
• Cardiovascular Research

Background:

• Pre-eclampsia is a serious pregnancy complication.
• The angiotensin-converting enzyme (ACE) gene has been investigated for its role in pre-eclampsia.
• An insertion-deletion (I-D) polymorphism in the ACE gene is common and may influence disease risk.

Purpose of the Study:

• To investigate the hypothesis that pre-eclampsia is associated with the ACE I-D polymorphism.
• To determine if maternal or fetal genotypes at the ACE I-D polymorphism are linked to pre-eclampsia development.

Main Methods:

• Case-control study comparing 72 women with pre-eclampsia and 83 normotensive pregnant women.
• Genotyping of maternal and fetal DNA for the ACE I-D polymorphism using polymerase chain reaction and agarose electrophoresis.
• Pre-eclampsia defined by elevated blood pressure (>=140/90 mm Hg) and proteinuria (>=300 mg/24h).

Main Results:

• No significant differences in ACE I-D genotype distributions or allele frequencies were observed between pre-eclamptic and normotensive pregnancies in either maternal or fetal samples.
• The odds ratio for pre-eclampsia associated with the DD genotype in mothers was 1.09 (95% CI: 0.55-2.16).
• The odds ratio for pre-eclampsia associated with the DD genotype in fetuses was 1.14 (95% CI: 0.56-2.32).

Conclusions:

• This study found no evidence to support an association between the angiotensin-converting enzyme gene insertion-deletion polymorphism and pre-eclampsia.
• The ACE I-D polymorphism does not appear to be a significant genetic risk factor for pre-eclampsia in this cohort.