Genetic polymorphism of IL-40 in male patients with ankylosing spondylitis

Background: Ankylosing spondylitis (AS) is a kind of arthritis marked by persistent inflammation in the spine's joints, usually at the point where the spine and pelvis meet. Such a disease has different causes, including immunological causes. Therefore, it is necessary to investigate the role of the immune system in this disease to improve a potential treatment strategy. In this context, the present study examined the single nucleotide polymorphisms (SNPs) of the IL-40 gene of IL-40 in a group of Iraqi males with AS to determine their associations in AS pathogenesis. Method: The study included a total of 200 Iraqi male participants (100 with AS and 100 healthy subjects). The detection of SNPs of IL-40 was performed using polymerase chain reaction (PCR) techniques followed by the Sanger sequencing method. Multinomial logistic regression analysis was used to analyze the SNPs under five genetic models (allele, recessive, dominant, and co-dominant). Results: Detected that the heterozygous genotype (GA and AA) and alleles (G and A) of rs72896265, the heterozygous genotype (AG and GG) and alleles (A and G) of rs60316778 and both heterozygous genotype (CC) and alleles (C and T) of rs9915090 were significantly associated with AS risk (p < 0.001).