Increased matriline 2 (MATN2), ubiquitin-conjugating enzyme E2W (UBE2W), DEAD box protein (DDX17), and protein kinase D1 (PRKD1) antibodies in IgA nephropathy (IgAN). Several autoAbs were identified with a significant increase in reactivities against their targets (Table 2). Scatterplots for antibodies of (A) MATN2, (B) UBE2W, (C) DDX17, and (D) PRKD1 are shown in terms of their relative fluorescence intensities in healthy controls and IgAN.