In renal-disease control subjects, the correlation coefficient between the levels of urinary HAA-reactive IgA1 and proteinuria was low compared to that in patients with IgAN (R2 = 0.180, P = 0.033) (Supplemental Figure 1, in Supplementary Material available online at http://dx.doi.org/10.1155/2016/7806438). The gene discussed is IGHA1; the disease is kidney disorder.