We report linkage to T1D/AITD for three chromosomal region and we replicate the previously reported association for T1D/AITD with single nucleotide polymorphisms (SNPs) in PTPN22, HLA-DRB1, INS, IFIH1, CTLA4 and C12orf30 [21, 23, 24, 33, 34]. This evidence concerns the gene PTPN22 and type 1 diabetes mellitus.