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Psoriasis is well known to have a critically important immune component. Many genome-wide association studies (GWAS) of psoriasis have identified genes involved in epidermal development and immune regulation. Tsoi and colleagues performed a meta-analysis of three GWAS and two independent data sets of genotyped individuals, with a focus on areas of the genome known to be important for immune function.
The researchers identified several new immune-related loci: Candidate genes STAT3, STAT5A, and STAT5B are transcription factors important for the differentiation of TH17 cells; they regulate cytokines associated with psoriasis, such as interleukins IL-20, IL-22, and IL-23. RUNX3 is important for the formation of TH1 CD4+ and CD8+ cells. The rese…