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During Class Switch Recombination (CSR) B cells replace the Igh Cμ/δ exons with another downstream constant region exon (CH), altering the antibody isotype. CSR occurs through the introduction of AID-mediated double strand break (DSBs) in switch regions and subsequent ligation of broken ends. Here we developed an assay to investigate the dynamics of DSB introduction in individual cells. We demonstrate that the upstream switch region Sμ is always targeted first during recombination and that the mechanism underlying this control relies on 53BP1. Surprisingly, regulation of break order occurs through residual binding of 53BP1 to chromatin before the introduction of damage and independent of its established role in DNA repair. Using chromosome conformation capture we show that 53BP1 mediates changes in chromatin architecture that affect break order. Finally, our results explain how changes in Igh architecture in the absence of 53BP1 could promote inversional rearrangements that compromise CSR. High Resolution 4C was performed in resting and activated B cells using a bait on the Eμ enhancer

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