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Endothelial nitric oxide synthase breaks down nitric oxide and has a key role in blood pressure regulation. Earlier studies have shown associations between single nucleotide polymorphisms (SNPs) in the NOS3 gene and hypertension. Studies also suggest that such associations may vary by dietary fat intake. We investigated associations between the NOS3 Glu298Asp SNP (rs1799983) and hypertension, as well as the interaction between NOS3 genotypes and dietary fat intake using data from baseline examination in white and African American participants in the Atherosclerosis Risk in Community (ARIC) study. Dietary fat intake was measured by a Food Frequency Questionnaire during the baseline examination in 15 792 individuals aged 45-64 years in ARIC study participants. Race-stratified unconditional logistic regression was performed to investigate the association between prevalent hypertension and NOS3 Glu298Asp genotypes. There was no significant interaction between dietary fat intake and NOS3 Glu298Asp genotype with regards to hypertension status in either African Americans or whites (P for interaction=0.3 and 0.4, respectively). We found a significant relationship between NOS3 Glu298Asp and triglycerides in African Americans. We did not find an association between the NOS3 Glu298Asp polymorphism and hypertension, and dietary fat intake did not interact with NOS3 genotypes to influence hypertension. We recommend further exploration of the relationship between NOS3 Glu298Asp and triglycerides in African Americans.

Association of NOS3 Glu298Asp SNP with hypertension and possible effect modification of dietary fat intake in the ARIC study