Study subjects comprised 418 angiographically proven CAD patients and 406 age-, gender-, and ethnic origin-matched controls. Genotyping was performed using polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) analysis.
There were no significant differences in the allelic distribution of TNF-α −308A (19.6 % vs. 19.0 % , P = 0.73), and IL-6 −174C (15.6 % vs. 14.3 % , P = 0.47) promoter polymorphisms between CAD patients and control subjects, respectively. In addition, single locus analysis revealed no differences in genotype frequencies between the two study groups, and the combined distribution of both genotypes did not differ significantly between controls and CAD patients (P > 0.05).
There is no allelic or genotypic association of TNF-α −308G > A and IL-6 −174G > C promoter polymorphisms with CAD in Tunisians, thereby confirming an ethnic-selective contribution of both gene variants to CAD presence.
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