https://orcid.org/0000-0003-2304-536X
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ABSTRACT
Background: Rheumatoid arthritis (RA) is a chronic inflammatory autoimmune disease. The present study intends to specify rs1059703, rs4810485, and rs1883832 gene polymorphisms of interleukin-1 receptor-associated kinase (IRAK1) and cluster of differentiation 40 (CD40) in RA. IRAK1 is a serine/threonine kinase and CD40 is a tumor necrosis factor receptor, both of which are involved in RA. There are conflicting results on functional effects of these polymorphisms, so we performed this research for a more accurate estimation on rheumatoid arthritis risk.
Methods: Two-hundred RA patients diagnosed according to ACR criteria and 200 normal controls participated in this case-control study. DNA Purification kit (Gene Transfer Pioneers, GTP) was used for genomic DNA extraction and three SNPs, including IRAK1 rs1059703 (C/T), CD40 rs1883832 (C/T) and rs4810485 (G/T), were genotyped by PCR-RFLP. The genotypes and allele frequencies of SNPs were analyzed by chi-square test to detect their contribution to RA.
Results: A significant correlation was found between rs1059703 T allele (OR = 2.36, 95% CI = 1.7–3.1, p = .0001) and TT and CT genotypes (TT genotype, OR = 2.54, 95%CI = 1.2–3.3, P = .0078, CT genotype; OR = 2.18 95%CI = 1.4–3.2P = .0002) of rs1059703 C/T polymorphism in terms of susceptibility to RA in recessive and over-dominant models. Alleles and genotypes of CD40 SNPs were not significantly different between RA cases and controls. The findings showed significant differences in rs1059703 IRAK1 genotypes with medical and laboratory features of patients.
Conclusion: Our results showed that the rs1059703 T allele (risk allele) of IRAK1 gene increases the risk of RA and the severity of disease, affecting the onset age of RA in Iranian patients.
Acknowledgments
We would like to thank Shariati Hospital staff for their contribution in blood collections and sampling. We also appreciate everyone who helped us in this project, especially Dr. Fatemeh Zare for her generous guidance. Finally, we are grateful for the participants of this study, including patients and controls.
Declaration of interest statement
The authors declare no conflict of interest. This study was financially supported by, Shahid Sadoughi University of medical sciences Yazd, Iran. This research was adapted from the thesis of an MSc student.