Human nuclear Dicer restricts the deleterious accumulation of endogenous double-stranded RNA.

Human nuclear Dicer restricts the deleterious accumulation of endogenous double-stranded RNA.
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DOI:
10.1038/nsmb.2827
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发表时间:
2014-06
影响因子:
16.8
通讯作者:
Gullerova M
Gullerova M
中科院分区:
生物学1区
文献类型:
--
作者:
White E;Schlackow M;Kamieniarz-Gdula K;Proudfoot NJ;Gullerova M

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Dicer是RNA干扰(RNAi)途径中的核心酶参与者,其作用是调节几乎所有真核生物中的基因表达。尽管Dicer的细胞质功能在哺乳动物中已得到充分证实,但其核功能仍然不清楚。在这里,我们表明Dicer存在于细胞核和细胞质中,但其核水平受到严格调控。在其核表现形式中,Dicer与RNA聚合酶II(Pol II)在活性转录的基因位点相互作用。Dicer的缺失导致内源性dsRNA的出现,导致干扰素应答途径的诱导和随后的细胞死亡。我们的研究结果表明,Pol II相关的Dicer限制了重叠非编码RNA转录单位的内源性dsRNA形成。如果不能做到这一点,就会对细胞功能产生灾难性的影响。
Dicer is a central enzymatic player in RNA interference (RNAi) pathways that acts to regulate gene expression in nearly all eukaryotes. Although the cytoplasmic function of Dicer is well-documented in mammals, its nuclear function remains obscure. Here we show that Dicer is present in both the nucleus and cytoplasm, but that its nuclear levels are tightly regulated. In its nuclear manifestation, Dicer interacts with RNA polymerase II (Pol II) at actively-transcribed gene loci. Loss of Dicer causes the appearance of endogenous dsRNA, leading to induction of the interferon response pathway and consequent cell death. Our results suggest that Pol II-associated Dicer restricts endogenous dsRNA formation from overlapping non-coding RNA transcription units. Failure to do so has catastrophic effects on cell function.
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