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- W3215067921 abstract "Class-switch recombination (CSR) involves replacement of the Cμ constant region with another downstream CH region. CSR is initiated by activation-induced cytidine deaminase (AID)-mediated DNA breaks that are targeted to transcriptionally active switch (S) regions. S region promoters (Prs) direct synapsis by associating with the Eμ and 3'Eα enhancers that jointly anchor a chromatin loop. We report that asymmetric loop extrusion allows 3'Eα to track along the locus and form Pr-Pr-E interactions that mediate CSR between downstream S regions, followed by switching to donor Sμ. This alternative pathway bypasses sequential switching and creates immunoglobulin (Ig)E+ B cells in the absence of IgG1 expression. Based on the analysis of diagnostic CSR products in B cell subsets, we identify a BCR-negative cell intermediate that is pivotal to efficient CSR." @default.
- W3215067921 created "2021-12-06" @default.
- W3215067921 creator A5004473247 @default.
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- W3215067921 date "2021-11-01" @default.
- W3215067921 modified "2023-10-09" @default.
- W3215067921 title "Loop extrusion promotes an alternate pathway for isotype switching" @default.
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- W3215067921 doi "https://doi.org/10.1016/j.celrep.2021.110059" @default.
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