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Coronary artery disease and endothelial nitric oxide synthase and angiotensin-converting enzyme gene polymorphisms
1Department of Cardiology, Jichi Medical School, Minamikawachi, Tochigi, Japan.
Insights
Genetic variations in the angiotensin-converting enzyme (ACE) gene, but not endothelial nitric oxide synthase (ecNOS), are associated with coronary artery disease (CAD). The ACE DD genotype may predict CAD risk, while ecNOS genotype shows no significant association with CAD.
Area of Science:
- Cardiovascular Genetics
- Molecular Biology
- Medical Research
Background:
- Nitric oxide (NO) plays a crucial role in vascular health by inhibiting platelet aggregation, smooth muscle cell proliferation, and leukocyte adhesion.
- Genetic variations in nitric oxide synthase (NOS) genes are hypothesized to influence the pathogenesis of coronary artery disease (CAD).
- The angiotensin-converting enzyme (ACE) gene is also implicated in cardiovascular regulation and disease.
Purpose of the Study:
- To investigate the association between genetic polymorphisms in endothelial constitutive nitric oxide synthase (ecNOS) and ACE genes and the risk of coronary artery disease (CAD).
- To determine if specific genotypes of ecNOS and ACE are predictive of CAD development.
Main Methods:
- Polymerase chain reaction (PCR) analysis was used to determine the genotypes of ecNOS and ACE in patients with CAD and control subjects.
- Genotype frequencies and allele frequencies were compared between the CAD group (n=40) and the control group (n=34).
- Combined analysis was performed to assess the interplay between ecNOS and ACE genotypes in relation to CAD.
Main Results:
- No significant difference was observed in the frequencies of ecNOS genotypes (4a/a, 4a/b, 4b/b) or allele frequencies (ecNOS4a, ecNOS4b) between CAD patients and controls.
- The frequency of the ACE DD genotype was significantly higher in the CAD group compared to the control group.
- The D allele frequency of the ACE gene was significantly higher in patients with CAD than in controls, suggesting a positive association.
Conclusions:
- The ACE genotype, particularly the DD genotype, may serve as a predictor for coronary artery disease (CAD).
- The investigated ecNOS gene polymorphisms did not appear to confer an appreciable increase in the risk of CAD.
- Further research is warranted to elucidate the precise mechanisms linking ACE gene variations to CAD pathogenesis.
Abstract:
Nitric oxide (NO) inhibits platelet aggregation, proliferation of vascular smooth muscle cells, and leukocyte adhesion to endothelial cells. Thus, genetic variation in or near NO synthase may be involved in the pathogenesis of coronary artery disease (CAD). We investigated the association between CAD and endothelial constitutive NO synthase (ecNOS) and angiotensin-converting enzyme (ACE) gene polymorphisms by polymerase chain reaction analysis. These genotypes were examined in consecutive patients with CAD (n = 40) and control subjects (n = 34). The frequency of ecNOS genotypes in the CAD group (4a/a + 4a/b: 48%; 4bb: 52%) did not differ from that in the control group (4a/a + 4a/b: 29%; 4bb: 71%). The allele frequencies of ecNOS4a and ecNOS4b also did not differ between the two groups. On the other hand, the frequency of the ACE DD genotype in the CAD group (DD: 45%; ID: 35%; II: 20%) was significantly higher than that in the control group (DD: 21%; ID: 35%; II: 44%). The frequency of the D allele in patients with CAD (0.63) was also significantly higher than in controls (0.38). Combined analysis showed that the frequency of the ecNOS genotypes in ACE DD genotype subjects (4a/a + 4a/b: 39%; 4b/b: 61%) in the CAD group was not significantly different from that in the control group (4a/a + 4a/b: 29%; 4b/b: 71%). The ACE genotype might be a predictor of CAD, while the ecNOS genotype appeared to confer no appreciable increase in the risk of CAD.