Microprocessor mediates transcriptional termination of long noncoding RNA transcripts hosting microRNAs.

Microprocessor mediates transcriptional termination of long noncoding RNA transcripts hosting microRNAs.
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DOI:
10.1038/nsmb.2982
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发表时间:
2015-04
影响因子:
16.8
通讯作者:
Jopling, Catherine L.
Jopling, Catherine L.
中科院分区:
生物学1区
文献类型:
--
作者:
Dhir, Ashish;Dhir, Somdutta;Proudfoot, Nick J.;Jopling, Catherine L.

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microRNA(miRNA)在基因表达的转录后调控中发挥着重要作用。哺乳动物miRNA的生物发生始于微处理器复合物对RNA聚合酶II(Pol II)转录物的共转录切割。虽然大多数miRNA位于蛋白质编码基因的内含子内,但相当少的miRNA来源于长非编码(lnc)RNA,其中转录物加工在很大程度上未被表征。我们通过对肝脏特异性lnc-pri-miR-122的详细表征和人类细胞系中的全基因组分析表明,大多数lnc-pri-miRNA不使用典型的切割和聚腺苷酸化(CPA)途径,而是使用微处理器切割来终止转录。这种微处理器失活导致lnc-pri-miRNA的广泛转录通读和对下游基因的转录干扰。因此,我们定义了一种新的RNase III介导的,多聚腺苷酸化独立的机制,在哺乳动物细胞中的Pol II转录终止。
MicroRNA (miRNA) play a major role in the post-transcriptional regulation of gene expression. Mammalian miRNA biogenesis begins with co-transcriptional cleavage of RNA polymerase II (Pol II) transcripts by the Microprocessor complex. While most miRNA are located within introns of protein coding genes, a substantial minority of miRNA originate from long non coding (lnc) RNA where transcript processing is largely uncharacterized. We show, by detailed characterization of liver-specific lnc-pri-miR-122 and genome-wide analysis in human cell lines, that most lnc-pri-miRNA do not use the canonical cleavage and polyadenylation (CPA) pathway, but instead use Microprocessor cleavage to terminate transcription. This Microprocessor inactivation leads to extensive transcriptional readthrough of lnc-pri-miRNA and transcriptional interference with downstream genes. Consequently we define a novel RNase III-mediated, polyadenylation-independent mechanism of Pol II transcription termination in mammalian cells.
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