La tunisie Medicale - 2020 ; Vol 98 ( n°012 ) : 986-991
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Summary

Introduction: Axial spondyloarthritis (SpA) is a common inflammatory arthritis characterized by axial skeletal inflammation, enthesitis, and association with HLA-B27. Pro-inflammatory cytokines play important roles in the regulation of inflammatory response and seem to be good candidates involved in the development of this pathology.
Aim: To assess the influence of the functional polymorphisms of single nucleotide polymorphims (SNPs) of IL-1 and IL-1 Ra in SpA susceptibility Tunisian patients.
Methods and Results: One hundred and one patients and 100 ethnic-matched healthy controls were genotyped. Susceptibility to SpA was showed with SNP’s: C/T of IL-1α (-889) (p=0.0001) and 1/1 of IL-1Ra (p<10-3). Analysis of SpA patients according to clinical behavior of the disease reveled the influence of these polymorphisms in SpA course. Indeed, individuals carrying the allele T (+3954) of IL-1β and allele 1 of IL-1Ra had an increased risk of peripheral arthritis (p=0.047, p=0.05, respectively). Also the 1/1 genotype of IL-1Ra was significantly decreased in SpA patients having an active disease (BASDAI>4) (p=0.033).
Conclusion: Genetic polymorphisms of pro-inflammatory IL-1/IL-1Ra cytokines seem to be involved in susceptibility and clinical course of SpA in Tunisian patients.

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