IGHA1 and IgA glomerulonephritis: Elevated levels of circulating IgA1 with galactose-deficient, O-linked, hinge-region glycans have been reported in IgA nephropathy patients compared to individuals with non-IgA renal disease and healthy controls in various populations, including Caucasians, African Americans, Japanese, and Chinese [7,8,9,10,11].