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The endothelial nitric oxide synthase (NOS3) gene has been implicated in the pathogenesis of hypertension-related left ventricular hypertrophy (LVH). Candidate-gene studies have examined the role of NOS3 variation, but reported results are inconsistent. In this study, we investigated the association of three clinically relevant polymorphisms (promoter T786C, intronic 4a/b, and nonsynonymous G894T) in a case-control sample of 230 ethnically homogeneous (Caucasians) patients with essential hypertension, with (n = 64) and without (n = 166) clinically diagnosed LVH. Haplotype analysis was also performed. In single-marker analyses, no significant associations with LVH were detected by univariate and multivariate regression models. In the haplotype-based association analysis, no common haplotype was associated with the development of LVH. A rare haplotype consisting of the three mutant alleles (C-a-T*) was found to be present only in patients with LVH (3.4%) and not in control hypertensive patients. Despite the biological rationale for the involvement of the NOS3 gene in LVH, no evidence for a major role of common NOS3 haplotypic variation was found. Considering the totality of available evidence, single-gene analyses of the NOS3 gene have not uncovered detectable genetic effects, and pathway-based analyses that examine interactions of multiple loci may be more informative about the complex genetic etiology of LVH.

Lack of Association Between Common Endothelial Nitric Oxide Synthase Gene Haplotypes and Left Ventricular Hypertrophy in Hypertension