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26 August 2017 : Laboratory Research  

Effect of Interferon-γ Polymorphisms on Ankylosing Spondylitis: A Case-Control Study

Haitao Xu1ABC*, Bo Li2DEFG

DOI: 10.12659/MSM.902822

Med Sci Monit 2017; 23:4126-4131


BACKGROUND: This research aimed to explore the effects of interferon-γ (IFN-γ) polymorphisms and expression profile on susceptibility to ankylosing spondylitis (AS) in a Chinese population.

MATERIAL AND METHODS: Blood samples were collected from 89 AS patients and 106 healthy controls. IFN-γ polymorphisms were genotyped by polymerase chain reaction (PCR) and sequencing methods. The genotype distribution of polymorphism in the control group was detected by Hardy-Weinberg equilibrium (HWE). Odds ratios (OR) with 95% confidence intervals (95%CI) were calculated using the χ² test to evaluate the association between AS susceptibility and IFN-γ polymorphisms. Moreover, serum IFN-γ level was measured by ELISA.

RESULTS: rs1861493 and rs2430561 polymorphisms were conformed to be in HWE in genotypes distribution of the control group (P>0.05 for both). However, only TT genotype and T allele of rs2430561 presented significantly higher frequencies in AS patients than in healthy controls (P=0.04 and 0.03, respectively), indicating that they obviously increased the risk of AS in a Chinese population (OR=2.54, 95%CI=1.01–6.40; OR=1.60, 95%CI=1.04–2.46). In AS patients, serum IFN-γ level was higher than in controls, and its expression patterns showed significant association with genotypes of rs2430561.

CONCLUSIONS: IFN-γ rs2430561 polymorphism may contribute to the risk of AS through influencing IFN-γ expression.

Keywords: Interferon-alpha, Polymorphism, Genetic, Spondylitis, Ankylosing

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750