That is the case for instances of the structural features of IgA N-glycosylation that have been associated with glomerular function and IgA nephropathy (IgAN), showing N-glycopeptides as better predictors of IgAN and renal function than galactose-deficient IgA1 levels measured by lectin-based ELISA [37]. Here, IGHA1 is linked to IgA glomerulonephritis.