Gene expression profile of tonsils of patients with IgA nephropathy

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We analyzed the gene expression in the tonsils of patients with IgA nephropathy (N=23) using microarray, compared with those with patients suffering from chronic tonsillitis without IgAN (N=22). We confirmed12 up-regulated genes including APOBEC2, CALB2, DUSP27, and CXCL11. APOBEC2 was positively stained in the epithelium and the peripheral region of the germinal center. The APOBEC2 was confirmed to be elevated in the tonsils in another 73 IgAN patients. These results suggest that the APOBEC2 might be associated with development of IgAN.