CD79A and IgA glomerulonephritis: In most cases the serology and histology help diagnose the underlying disease, such as, presence of IgA deposits on IF in IgA nephropathy, antistreptococcal antibody positivity and sub epithelial deposits in PIGN, antinuclear antibodies (ANA) positivity and a “full house” (IgG, IgA, IgM, C3 and C1q) positivity on IF in LN.