IL2RA and type 1 diabetes mellitus: Nevertheless, in T1D, combined analyses of several studies provided evidence for four linked regions, the major locus MHC on 6p21 (previously designated IDDM1), 10p14-q11 (IDDM10), 2q31-q33 (IDDM7 and IDDM12) and 16q22-q24 [2].