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Elucidation of IgH 3' region regulatory role during class switch recombination via germline deletion.

Abstract : In mature B cells, class switch recombination (CSR) replaces the expressed constant Cμ gene with a downstream C(H) gene. How the four transcriptional enhancers of the IgH 3' regulatory region (3'RR) control CSR remains an open question. We have investigated IgG1 CSR in 3'RR-deficient mice. Here we show that the 3'RR enhancers target the S(γ1) acceptor region (and poorly the S(μ) donor region) by acting on epigenetic marks, germline transcription, paused RNA Pol II recruitment, R loop formation, AID targeting and double-strand break generation. In contrast, location and diversity of S(μ)-S(γ1) junctions are not affected by deletion of the 3'RR enhancers. Thus, the 3'RR controls the first steps of CSR by priming the S acceptor region but is not implicated in the choice of the end-joining pathway.
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https://hal.archives-ouvertes.fr/hal-01212563
Contributor : Claire Carrion Connect in order to contact the contributor
Submitted on : Tuesday, October 6, 2015 - 6:27:38 PM
Last modification on : Thursday, March 15, 2018 - 11:22:57 AM

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  • HAL Id : hal-01212563, version 1
  • PUBMED : 25959683

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Alexis Saintamand, Pauline Rouaud, Faten Saad, G Rios, Michel Cogné, et al.. Elucidation of IgH 3' region regulatory role during class switch recombination via germline deletion.. Nature Communications, Nature Publishing Group, 2015. ⟨hal-01212563⟩

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