Correlation between IFNGR gene polymorphism and atherosclerotic plaque stability in Yunnan Han nationality / 重庆医学

ABSTRACT

Objective to explore the correlation between interferon-γ receptor(IFNGR)2 amino acid sites Val14Met and GIn64Arg polymorphism and atherosclerosis plaque stability in Yunnan Han nationality.Methods The patients with unstable atherosclerotic plaque in our hospital from March 2014 to March 2015 were collected as the observation group and contemporaneous patients with stable atherosclerotic plaque/non-plaque as the control group.The peripheral venous blood was collected for extracting genomic DNA.IFNGR Va114Met and GIn64Arg loci genotype was detected by the PCR product direct sequencing method.The sequencing results were analyzed by adopting the DNAStar and GeneTool software.The levels of plasma cytokines(IFN-γ)was detected by the flow cytometry.Results Two hundreds and four native Han patients were included in this study,including the observation group,109 cases,age(76.89±12.08)years old;the control group,95 cases,age(65.99±16.32)years old.The polymorphism change of IFNGR1 Vall4Met loci was not found irn the two groups.In the observation group,the frequency of IFNGR2 Gln64Arg genotype AA was 51.95％(40/77),which of AGwas 53.06 ％(52/98)and which of GG was 58.62％(17/29);in the control group,the frequencies were 48.05 ％ (37/77),46.94 ％ (46/98) and 41.38 ％ (12/29),chi-square test,P =0.824.The IFNGR2 Gln64Arg genotypes AA,AG and GG had no relation with atherosclerotic plaque stability.The A and G allele frequencies in the observation group were 52.38％ (132/252)and 55.13 ％ (86/156)respectively,which of the control group were 47.62 ％ (120/252)and 44.87％ (70/156),chi-square test's P=0.661.The IFNGR2 Gln64Arg A/G allele had no relation with atherosclerotic plaque stability.By Hardy-Weinberg genetic balance test,the gene frequency in this sample population was in accordance with the genetic equilibrium law.The plasma IFN-γ level in the observation group was(4.60 ± 1.91)ng/mL,which in the control group was (4.88 ± 2.10)ng/ mL,the difference was not statistically significant(P=0.318);the plasma IFN-γ content had no relation with atherosclerotic plaque stability(P=0.308).Conclusion The genetic polymorphisms of IFNGR can not serve as a warning indicator of atherosclerotic plaque stability.