IFNA1 and type 1 diabetes mellitus: Using DNA microarray analysis, they assessed the IFN-inducible transcriptional signature in PBMCs across various groups, including 49 patients with recently diagnosed T1D, 15 patients with long-standing T1D, 93 healthy adult volunteers, and 109 genetically predisposed children from the BABYDIET study, a prospective birth cohort study.