PTPN22 and type 1 diabetes mellitus: Onengut-Gumuscu et al., 2015, identified coding variants associated with T1DM in seven genes including PTPN22 (tyrosine phosphatase, previously identified in a candidate gene study), IFIH1 (receptor of RIG-I-like receptor group), SH2B3 (adapter protein), CD226, TYK2 (Tyrosine kinase 2), FUT2 (Galactoside-2-alpha-L-fucosyltransferase 2), and SIRPG (Signal regulatory protein gamma) [56].