Evaluation of IFN-γ polymorphism in visceral leishmaniasis
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Background: Leishmaniasis is a tropical disease that is endemic in some areas of Iran, includ-ing East Azerbaijan. IFN-? is one of the cytokines that triggers cell-mediated immunity, thus initi-ating elimination of the infection. This case-control study was performed to investigate the asso-ciation between the polymorphism of the IFN-? gene at the +874A/T locus and visceral leishman-iasis (VL). Methods: In this study conducted during 2012-2013, 267 participants were selected from indi-viduals living in an endemic area of VL. Subjects were divided into three groups; 86 patients with VL, 82 seropositive individuals without any history of leishmaniasis, and 99 seronegative healthy controls. Genotyping of the IFN-? +874A/T polymorphism was carried out using an Amplification Refractory Mutation System-PCR (ARMS-PCR). Results: The frequency of the +874A allele in the patient group (75.5%) was higher than in the seropositive individuals (54%). The highest frequency of the +874T/T genotype was observed in seropositive individuals, while the patient group had the lowest frequency (34.1% vs. 24.5%). However, these differences were not significant. Conclusion: There was no significant association between IFN-? +874A/T polymorphism and VL.
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