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RNA-interference-directed chromatin modification coupled to RNA polymerase II transcription

机译:RNA干扰导向的染色质修饰与RNA聚合酶II转录偶联

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RNA interference (RNAi) acts on long double-stranded RNAs (dsRNAs) in a variety of eukaryotes to generate small interfering RNAs that target homologous messenger RNA, resulting in their destruction. This process is widely used to 'knock-down' the expression of genes of interest to explore phenotypes(1-3). In plants(3-5), fission yeast(6-8), ciliates(9,10), flies(11) and mammalian cells(12,13), short interfering RNAs (siRNAs) also induce DNA or chromatin modifications at the homologous genomic locus, which can result in transcriptional silencing or sequence elimination(14). siRNAs may direct DNA or chromatin modification by siRNA - DNA interactions at the homologous locus(4,5). Alternatively, they may act by interactions between siRNA and nascent transcript(15,16). Here we show that in fission yeast ( Schizosaccharomyces pombe), chromatin modifications are only directed by RNAi if the homologous DNA sequences are transcribed. Furthermore, transcription by exogenous T7 polymerase is not sufficient. Ago1, a component of the RNAi effector RISC/RITS complex, associates with target transcripts and RNA polymerase II. Truncation of the regulatory carboxy-terminal domain (CTD) of RNApol II disrupts transcriptional silencing, indicating that, like other RNA processing events(17-19), RNAi-directed chromatin modification is coupled to transcription.
机译:RNA干扰(RNAi)作用于各种真核生物中的长双链RNA(dsRNA),产生靶向同源信使RNA的小干扰RNA,导致其破坏。该过程被广泛用于“敲低”感兴趣基因的表达以探索表型(1-3)。在植物(3-5),裂变酵母(6-8),纤毛虫(9,10),果蝇(11)和哺乳动物细胞(12,13)中,短干扰RNA(siRNA)也会诱导DNA或染色质的修饰同源基因组位点,可能导致转录沉默或序列消除(14)。 siRNA可能通过siRNA-DNA在同源基因座上的相互作用来指导DNA或染色质的修饰(4,5)。或者,它们可能通过siRNA和新生转录本之间的相互作用起作用(15,16)。在这里,我们显示在裂殖酵母(裂殖酵母)中,如果转录了同源DNA序列,则染色质修饰仅由RNAi指导。此外,通过外源T7聚合酶的转录是不够的。 Ago1是RNAi效应RISC / RITS复合体的组成部分,与目标转录本和RNA聚合酶II相关。 RNApol II的调节性羧基末端结构域(CTD)的截短可破坏转录沉默,表明与其他RNA处理事件一样(17-19),RNAi导向的染色质修饰与转录偶联。

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