The RNA-binding protein QKI5 regulates primary miR-124-1 processing via a distal RNA motif during erythropoiesis

The RNA-binding protein QKI5 regulates primary miR-124-1 processing via a distal RNA motif during erythropoiesis
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RNA 结合蛋白 QKI5 在红细胞生成过程中通过远端 RNA 基序调节初级 miR-124-1 加工

DOI:
10.1038/cr.2017.26
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发表时间:
2017-02
期刊:
影响因子:
44.1
通讯作者:
Jia Yu
Jia Yu
中科院分区:
生物学1区
文献类型:
--
作者:
Fang Wang;Wei Song;Hongmei Zhao;Yanni Ma;Yuxia Li;Di Zhai;Lei Dong;Rui Su;Mengmeng Zhang;Yong Zhu;Xiaoxia Ren;Fei Miao;Wenjie Liu;Feng Li;Junwu Zhang;Aibin He;Ge Shan;Jingyi Hui;Linfang Wang;Jia Yu

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microRNA(miRNA)的生物合成受到复杂的转录后调节因子(包括RNA结合蛋白(RBP))的精细控制。在这里,我们表明RBP QKI 5在红细胞生成过程中激活初级miR-124-1(pri-124-1)的加工。QKI 5识别远端QKI反应元件,并通过与DGCR 8相互作用招募微处理器。此外,通过两个互补序列之间的空间RNA-RNA相互作用,将募集的微处理器带到pri-124-1茎环。因此,突变破坏它们的碱基配对影响QKI 5激活的强度。当红细胞生成进行时,QKI 5的伴随减少将微处理器从pri-124-1释放并降低成熟miR-124水平以促进红细胞成熟。从机制上讲,miR-124靶向TAL 1和c-MYB,这两种转录因子参与正常红细胞生成。重要的是,这种QKI 5介导的调节也产生了独特的miRNA特征,这是红细胞分化所必需的。综上所述,这些结果证明了QKI 5在红细胞生成过程中初级miRNA加工中的关键作用,并为初级转录物上的远端元件如何影响miRNA生物发生提供了新的见解。
MicroRNA (miRNA) biogenesis is finely controlled by complex layers of post-transcriptional regulators, including RNA-binding proteins (RBPs). Here, we show that an RBP, QKI5, activates the processing of primary miR-124-1 (pri-124-1) during erythropoiesis. QKI5 recognizes a distal QKI response element and recruits Microprocessor through interaction with DGCR8. Furthermore, the recruited Microprocessor is brought to pri-124-1 stem loops by a spatial RNA-RNA interaction between two complementary sequences. Thus, mutations disrupting their base-pairing affect the strength of QKI5 activation. When erythropoiesis proceeds, the concomitant decrease of QKI5 releases Microprocessor from pri-124-1 and reduces mature miR-124 levels to facilitate erythrocyte maturation. Mechanistically, miR-124 targets TAL1 and c-MYB, two transcription factors involved in normal erythropoiesis. Importantly, this QKI5-mediated regulation also gives rise to a unique miRNA signature, which is required for erythroid differentiation. Taken together, these results demonstrate the pivotal role of QKI5 in primary miRNA processing during erythropoiesis and provide new insights into how a distal element on primary transcripts affects miRNA biogenesis.
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