HNF1A and diabetes mellitus: This is the case of the insulin gene (INS, monogenic neonatal diabetes, Maturity Onset of Diabetes in the Young (MODY) and multifactorial T1D), as well as KCNJ11, WFS1, HNF1A, HNF1B (neonatal, syndromic, or MODY monogenic diabetes, and multifactorial T2D) and GLIS3 (neonatal monogenic diabetes and multifactorial T1D and T2D).