As already pointed out earlier significantly higher levels of IgA and IgG antibodies directed against OMHP have been observed in patients with IgA nephropathy compared to patients with other glomerular diseases [40] and the titers of IgA antibodies against Haemophilus parainfluenzae significantly correlated with the degree of glomerular injury especially in patients with episodes of macroscopic hematuria [43]. Here, CD79A is linked to IgA glomerulonephritis.