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RESEARCH ARTICLE
Year : 2015  |  Volume : 52  |  Issue : 1  |  Page : 30-35

Effect of tumour necrosis factor-alpha and interleukin-6 promoter polymorphisms on course of Crimean-Congo hemorrhagic fever in Turkish patients


1 Department of Research Centre, Cumhuriyet University, Faculty of Medicine, Sivas, Turkey
2 Department of Infectious Diseases and Clinical Microbiology, Cumhuriyet University, Faculty of Medicine, Sivas, Turkey
3 Department of Nutrition and Diet, Cumhuriyet University, Faculty of Medicine, Sivas, Turkey
4 Department of Medical Biochemistry, Cumhuriyet University, Faculty of Medicine, Sivas, Turkey
5 Department of Histology and Embryology, Cumhuriyet University, Faculty of Medicine, Sivas, Turkey
6 Department of Medical Biology, Cumhuriyet University, Faculty of Medicine, Sivas, Turkey, Turkey

Correspondence Address:
Dr Meral Yilmaz
Department of Research Centre, Faculty of Medicine, Cumhuriyet University, Sivas
Turkey
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Source of Support: None, Conflict of Interest: None


PMID: 25815864

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Objective: In this case-control study, we investigated whether IL-6 (-174G/C) and TNF-α (-308G/A) gene polymorphisms affect the clinical course and outcome of CCHF. Methods: Total 150 patients with CCHF and 170 controls were examined in this study. Genotyping of these polymorphisms were performed by PCR-RFLP methods. Results: We found no statistically significant differences in genotype and allele frequencies of these polymorphisms between patients and controls [(χ2 = 1.31, p = 0.51 for TNF-α) and (χ2 = 2.61, p = 0.27 for IL-6)]. Either TNF-α AA or IL-6 CC genotypes in dead cases were not observed in this study. Frequency of heterozygous genotypes in both IL-6 (GC) and TNF-α (GA) was higher in dead patients than living patients. However, the difference was not statistically significant. A significant difference was found in AST levels and INR when compared to patients with CCHF who died and who survived [OR = 13.9 (95% CI = 1.79-107) for INR, p = 0.01] and [OR = 23.3 (95% CI = 3.62-149) for AST, p = 0.001], respectively. Conclusion: We did not find a significant association of IL-6 -174G/C and TNF-α -308G/A polymorphisms on the prognosis of CCHF and mortality in this study. We suggest that AST and INR may be important biomarkers for determining the risk of severity and death as a result of infection with Crimean-Congo hemorrhagic fever virus (CCHFV).


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