Intrinsic transcriptional heterogeneity in B cells controls early class switching to IgE.

Intrinsic transcriptional heterogeneity in B cells controls early class switching to IgE.
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DOI:
10.1084/jem.20161056
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发表时间:
2017-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Rada C
Rada C
中科院分区:
其他
文献类型:
--
作者:
Wu YL;Stubbington MJ;Daly M;Teichmann SA;Rada C

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Combining novel mouse reporters and single-cell transcriptomic analyses, Wu et al. uncover differential activation thresholds for the transcripts that direct antibody class switching to IgE versus IgG1 in response to IL-4 and explain how cell-intrinsic transcriptional heterogeneity governs CSR. Noncoding transcripts originating upstream of the immunoglobulin constant region (I transcripts) are required to direct activation-induced deaminase to initiate class switching in B cells. Differential regulation of Iε and Iγ1 transcription in response to interleukin 4 (IL-4), hence class switching to IgE and IgG1, is not fully understood. In this study, we combine novel mouse reporters and single-cell RNA sequencing to reveal the heterogeneity in IL-4–induced I transcription. We identify an early population of cells expressing Iε but not Iγ1 and demonstrate that early Iε transcription leads to switching to IgE and occurs at lower activation levels than Iγ1. Our results reveal how probabilistic transcription with a lower activation threshold for Iε directs the early choice of IgE versus IgG1, a key physiological response against parasitic infestations and a mediator of allergy and asthma.
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