MicroRNA-directed pathway discovery elucidates an miR-221/222-mediated regulatory circuit in class switch recombination.

MicroRNA-directed pathway discovery elucidates an miR-221/222-mediated regulatory circuit in class switch recombination.
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DOI:
10.1084/jem.20201422
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发表时间:
2021-11-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Ansel KM
Ansel KM
中科院分区:
其他
文献类型:
--
作者:
Wigton EJ;Mikami Y;McMonigle RJ;Castellanos CA;Wade-Vallance AK;Zhou SK;Kageyama R;Litterman A;Roy S;Kitamura D;Dykhuizen EC;Allen CDC;Hu H;O'Shea JJ;Ansel KM

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The network properties of miRNA regulation can be leveraged to discover coregulated genes and pathways that converge on shared biological functions. Wigton et al. uncover an miR-221/222–regulated circuit of transcriptional and epigenetic modulators of class switch recombination. MicroRNAs (miRNAs, miRs) regulate cell fate decisions by post-transcriptionally tuning networks of mRNA targets. We used miRNA-directed pathway discovery to reveal a regulatory circuit that influences Ig class switch recombination (CSR). We developed a system to deplete mature, activated B cells of miRNAs, and performed a rescue screen that identified the miR-221/222 family as a positive regulator of CSR. Endogenous miR-221/222 regulated B cell CSR to IgE and IgG1 in vitro, and miR-221/222–deficient mice exhibited defective IgE production in allergic airway challenge and polyclonal B cell activation models in vivo. We combined comparative Ago2-HITS-CLIP and gene expression analyses to identify mRNAs bound and regulated by miR-221/222 in primary B cells. Interrogation of these putative direct targets uncovered functionally relevant downstream genes. Genetic depletion or pharmacological inhibition of Foxp1 and Arid1a confirmed their roles as key modulators of CSR to IgE and IgG1.
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