The transcription factor Bach2 is required for germinal center formation, somatic hypermutation (SHM), and class-switch recombination (CSR) of immunoglobulins. SHM and CSR are initiated by activation-induced cytidine deaminase (AID) which has potential to induce human B cell lymphoma. To understand the role of Bach2 in AID-mediated immunoglobulin gene diversification processes, we established a BACH2-deficient DT40 B cell line. We show that in addition to allowing SHM, Bach2 drives immunoglobulin gene conversion (GCV), another AID-dependent antibody gene diversification process. We demonstrate that Bach2 promotes GCV by increasing the expression of AID. Importantly, we found that the regulation of AID is independent of Blimp-1 and that BACH2-deficient cells have altered expression of several genes regulating AID expression, stability and function. Furthermore, re-expression of BACH2 or AID in Bach2KO cells restored the SHM and GCV defects. These results demonstrate that Bach2 has a previously unappreciated role in the production of high-affinity antibodies.
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