title: A meta-analysis on the relationship of eNOS 4b/a polymorphism and diabetic nephropathy susceptibility.
abstract: To clarify the effect of nitric oxide synthase (NOS) type III 4b/a polymorphism on the susceptibility to diabetic nephropathy (DN) by meta-analysis, we performed a computerized search of PubMed, EMBASE, Chinese BioMedical Literature Database, China Science and Technology Journal Database, Chinese Journal Full-text Database and WanFang to identity case-control studies on relationship between NOS type III 4b/a polymorphism and the susceptibility to DN. Statistic analysis and heterogeneity test were conducted by StataSE12. The meta-analysis involved 26 studies for DN comparing with diabetes mellitus (DM) and 15 studies for DN comparing with healthy persons, which provided 6144/4900 cases/controls and 2134/2348 cases/controls, respectively. Moderate heterogeneity was found among including studies. The qualities of half studies are low. Meta-analysis derived a significant association between the NOS type III 4b/a and the risk of developing DN in Asian population. The sensitivity analysis (exclusion of studies not in Hardy-Weinberg equilibrium) produced non-significant changes. Compared with diabetes patients, the pre-allele model produced certain association in global populations [odds ratio (OR) = 1.26, 95% confidence interval (95% CI): 1.10-1.45], significant association in Asian population (OR = 1.51, 95% CI: 1.13-2.01) and certain association in type 2 DM patients (OR = 1.29, 95% CI: 1.09-1.54). Only in the dominant model, the funnel plot and Egger's test provided evidence of publication bias (p = 0.024). Overall, although there is some evidence of association between NOS type III 4b/a polymorphism and DN in Asian population, the more reliable findings need further and more rigorous, prospective and high-quality studies.
authors.affiliation: Evidence-Based Medicine Center of Lanzhou University , Lanzhou, Gansu , China .
authors.forename: Rong
authors.initials: R
authors.lastname: Zeng
authors.forename: Lei
authors.initials: L
authors.lastname: Duan
authors.forename: Lina
authors.initials: L
authors.lastname: Sun
authors.forename: Yuke
authors.initials: Y
authors.lastname: Kong
authors.forename: Xiaolu
authors.initials: X
authors.lastname: Wu
authors.forename: Ya
authors.initials: Y
authors.lastname: Wang
authors.forename: Gang
authors.initials: G
authors.lastname: Xin
authors.forename: Kehu
authors.initials: K
authors.lastname: Yang
mesh_terms: D003928:Diabetic Nephropathies / Q000208:ethnology / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D052250:Nitric Oxide Synthase Type III / Q000235:genetics*; D011110:Polymorphism, Genetic
chemical_list: C496314:NOS3 protein, human; D052250:Nitric Oxide Synthase Type III
keywords: Diabetic nephropathies; meta-analysis; molecular epidemiology; nitric oxide synthase type III; polymorphism