More specifically, interferon-γ (IFN-γ)-secreting T helper 1 (Th1) cells and interleukin-17 (IL-17)-secreting T helper 17 (Th17) cells are known to be associated with the pathogenesis of organ-specific inflammatory diseases, including psoriasis and inflammatory bowel diseases (1, 2). The gene discussed is IFNG; the disease is inflammatory bowel disease.