Psoriasis is a chronic autoimmune inflammatory disease that affects the skin and the joints.
Psoriasis is characterized by the keratinocyte proliferation, which is induced by
cytokines Th1 and Th17. Patients with plaque
psoriasis present a chronic inflammatory response with high levels of
interleukin (IL)-12 and
IL-23. Various single-nucleotide polymorphisms (SNP) have been identified in the IL12B gene, such as SNP
3' UTR 1188 A/C (SNP rs3212227), which has been associated with susceptibility to developing plaque
psoriasis and with the production of
IL-12 and
IL-23 in individuals of different ethnic groups. In this study, we determined whether there is an association of SNP rs3212227 with the susceptibility of developing plaque
psoriasis and with serum levels of
IL-12 and
IL-23 in Mestizo population in western Mexico. We included 112 patients with
psoriasis and 112 clinical healthy individuals in the study. The frequencies of genotypes A/A, A/C, and C/C in patients with plaque
psoriasis were 41, 53, and 6%, respectively, while in the control group, these were 37, 53, and 10%, respectively, without finding statistically significant differences between both groups (p>0.05). Although
IL-12 and
IL-23 serum levels were higher in patients than in controls, we found no significant differences. The group of patients with genotype CC presented the highest levels of
IL-23 (p<0.05). These data suggest that the SNP rs3212227 phenotype is not associated with the risk of developing plaque
psoriasis or with
IL-12 and
IL-23 levels in Mestizo population in western Mexico.