Type 1 Diabetes Mellitus 20, also known as diabetes mellitus, insulin-dependent, 20, is related to acute myeloid leukemia with mutated cebpa and immunodeficiency 21. An important gene associated with Type 1 Diabetes Mellitus 20 is HNF1A (HNF1 Homeobox A). Affiliated tissues include heart, and related phenotype is type i diabetes mellitus.