title: Strong interaction between T allele of endothelial nitric oxide synthase with B1 allele of cholesteryl ester transfer protein TaqIB highly elevates the risk of coronary artery disease and type 2 diabetes mellitus.
abstract: BACKGROUND
  The present study was conducted to investigate the possible outcome of interaction between endothelial nitric oxide (NOS3) G894T and cholesteryl ester transfer TaqIB variants on the risk of coronary artery disease (CAD) and type 2 diabetes mellitus (T2DM). The sample included a total of 207 CAD patients (102 CAD patients with T2DM and 105 CAD patients without T2DM). There were also 101 patients with T2DM and 92 age- and sex-matched healthy individuals as controls. All study participants were from Western Iran. The sample was genotyped by polymerase chain reaction-restriction fragment length polymorphism.
  
  
  RESULTS
  The presence of NOS3 T allele was not associated with the risk of CAD or T2DM, and the CETP B1 allele was only significantly associated with the increased risk of CAD in total CAD patients (odds ratio (OR) = 5.1, p = 0.019). However, the concomitant presence of both CETP B1 and NOS3 T alleles significantly increased the risk of CAD in total CAD patients (OR = 18.1, p < 0.001), in CAD patients without T2DM (OR = 27.1, p = 0.03), and in CAD patients with T2DM (OR = 13.5, p = 0.002). Also, the presence of both alleles increased the risk of T2DM (OR = 12, p = 0.004).
  
  
  CONCLUSIONS
  Our findings, for the first time, indicate that NOS3 T allele strongly interacts with CETP B1 allele to augment the risk of CAD and T2DM in the population of Western Iran.
authors.affiliation: Medical Biology Research Center, Medical School, Kermanshah University of Medical Sciences, Kermanshah, Iran. zrahimi@kums.ac.ir
authors.forename: Zohreh
authors.initials: Z
authors.lastname: Rahimi
authors.forename: Reza
authors.initials: R
authors.lastname: Nourozi-Rad
authors.forename: Ziba
authors.initials: Z
authors.lastname: Rahimi
authors.forename: Abbas
authors.initials: A
authors.lastname: Parsian
mesh_terms: D000368:Aged; D000483:Alleles; D016022:Case-Control Studies; D053480:Cholesterol Ester Transfer Proteins / Q000235:genetics* / Q000378:metabolism; D003324:Coronary Artery Disease / Q000453:epidemiology / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D052250:Nitric Oxide Synthase Type III / Q000235:genetics* / Q000378:metabolism; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D012307:Risk Factors
chemical_list: C506642:CETP protein, human; D053480:Cholesterol Ester Transfer Proteins; C496314:NOS3 protein, human; D052250:Nitric Oxide Synthase Type III