eNOS haplotypes associated with gestational hypertension or preeclampsia

Area of Science:

• Genetics
• Obstetrics
• Cardiovascular Research

Background:

• Polymorphisms in the endothelial nitric oxide synthase (eNOS) gene have shown inconsistent associations with preeclampsia.
• Understanding the genetic basis of hypertensive disorders of pregnancy is crucial for improved diagnostics and treatment.

Purpose of the Study:

• To compare genotype and haplotype frequencies of three eNOS gene polymorphisms in normotensive and hypertensive pregnancies.
• To investigate the role of eNOS gene variations in the development of gestational hypertension and preeclampsia.

Main Methods:

• Genotyping for three eNOS polymorphisms (T-786C, Glu298Asp, intron 4 b/a) was performed in 326 pregnant women.
• Participants included healthy pregnancies, gestational hypertension, and preeclampsia groups.
• Haplotype analysis was conducted to assess combinations of polymorphisms.

Main Results:

• No significant differences were found in the frequencies of individual eNOS genotypes or alleles among the study groups.
• The 'T Glu a' eNOS haplotype was significantly more common in healthy pregnancies compared to hypertensive groups (p < 0.0032).
• Conversely, the 'C Glu a' haplotype was more prevalent in gestational hypertensive and preeclamptic women than in healthy controls (p = 0.0061).

Conclusions:

• eNOS gene haplotypes, rather than single genotypes, may contribute to the development of hypertensive disorders of pregnancy.
• The impact of eNOS gene variations on hypertensive disorders may be masked when only individual genotypes are analyzed.
• These findings highlight the importance of haplotype analysis in understanding the genetic susceptibility to preeclampsia and gestational hypertension.