Recent studies in type 1 diabetes (T1D) cohorts have highlighted robust loci such as protective variants in COL4A3 (e.g., rs55703767), as well as signals in AFF3, FRMD3, and the RGMA–MCTP2 region, which are consistently associated with albuminuria, eGFR decline, and ESKD (24, 25). The gene discussed is AFF3; the disease is type 1 diabetes mellitus.