Surveillance-ready transcription: nuclear RNA decay as a default fate.

Surveillance-ready transcription: nuclear RNA decay as a default fate.
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DOI:
10.1098/rsob.170270
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发表时间:
2018-03
期刊:
影响因子:
5.8
通讯作者:
Tollervey D
Tollervey D
中科院分区:
生物学2区
文献类型:
--
作者:
Bresson S;Tollervey D

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真核细胞合成大量来自不同类别的RNA,其中大多数都经过广泛的加工。这些过程本质上容易出错,细胞已经进化出强大的质量控制机制来选择性地去除异常转录本。这些监视途径监测核RNA生物发生的所有方面,并且另外去除由假转录和大量非蛋白质编码RNA(ncRNA)产生的非功能性转录物。令人惊讶的是,这在很大程度上是用少数RNA降解酶完成的。因此,目前还不清楚这些因子如何有效地区分功能性RNA和大量必须降解的不同转录物。在这里,我们描述如何真正的转录本是特别保护,特别是5′和3′修饰。相反,与新生转录物相关的过多因子都起作用以招募RNA质量控制、监视和降解机制。我们的结论是,启动RNAPII是“监视准备”,与退化是一个默认的命运,所有的成绩单,缺乏特定的保护功能。我们进一步假设,这种滥交是允许包括人类在内的真核生物中大量ncRNA增殖的关键特征。
Eukaryotic cells synthesize enormous quantities of RNA from diverse classes, most of which are subject to extensive processing. These processes are inherently error-prone, and cells have evolved robust quality control mechanisms to selectively remove aberrant transcripts. These surveillance pathways monitor all aspects of nuclear RNA biogenesis, and in addition remove nonfunctional transcripts arising from spurious transcription and a host of non-protein-coding RNAs (ncRNAs). Surprisingly, this is largely accomplished with only a handful of RNA decay enzymes. It has, therefore, been unclear how these factors efficiently distinguish between functional RNAs and huge numbers of diverse transcripts that must be degraded. Here we describe how bona fide transcripts are specifically protected, particularly by 5′ and 3′ modifications. Conversely, a plethora of factors associated with the nascent transcripts all act to recruit the RNA quality control, surveillance and degradation machinery. We conclude that initiating RNAPII is ‘surveillance ready’, with degradation being a default fate for all transcripts that lack specific protective features. We further postulate that this promiscuity is a key feature that allowed the proliferation of vast numbers of ncRNAs in eukaryotes, including humans.
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