Class-switched IgG autoantibodies but not unswitched IgM autoantibodies play a crucial role in the development of systemic lupus erythematosus (SLE). Bach2 is known to be essential for class switch recombination of Ig genes, but recent genomic and clinical studies have suggested an association of Bach2 deficiency with SLE. This study was undertaken to examine the mechanism by which Bach2 regulates the development of SLE.
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