MGAT3 and type 1 diabetes mellitus: These variants are located near the N-glycosyltransferase gene MGAT3, show pleiotropy with MGAT3 expression in whole blood and specifically in cell types relevant for IgG biosynthesis, and their associated IgG glycans with bisecting GlcNAc were significantly different between the recent-onset type 1 diabetes patients and their healthy siblings.