Allelic association analysis (two-tailed) showed that three of the five targeted SNPs were significantly associated with overall susceptibility for CD (ZNF365, r10995271, P = 0.001; PTPN2, rs1893217, P = 0.005; STAT3, rs744166, P = 0.01).
PTPN2 (rs2542151) was only associated in the smoking CD cohort (P=0.041), and not in the entire cohort (P=0.23) or in the non-smoking CD cohort (P=0.80).
We replicated genetic associations for CD with IL23R, ATG16L1, IRGM, NKX2-3, 1q24, 10q21, 5p13, and PTPN2 and report evidence for associations with HERC2 and CCNY.
Here, we demonstrate increased PTPN2 expression in CD intestinal biopsy specimens and that the proinflammatory cytokine interferon (IFN)-gamma increases PTPN2 expression and activity in IEC.