This observation is supported by our model of T-cell-specific B-lymphocyte-induced maturation protein 1 (Blimp-1) deficiency-induced colitis, in which more severe colitogenesis was observed in diabetes-prone non-obese diabetic (NOD) mice than in non-diabetes-prone C57BL/6 mice. The gene discussed is PRDM1; the disease is diabetes mellitus.