前piRNA修剪保护piRNAs免受RNA依赖RNA聚合酶的错误向
Benjamin Pastore1, Hannah L Hertz2, Wen Tang1
1Department of Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH 43210, USA; Center for RNA Biology, The Ohio State University, Columbus, OH 43210, USA; Ohio State Biochemistry Program, The Ohio State University, Columbus, OH 43210, USA.
Cell reports
|January 20, 2024
概括
在C. elegans中,PARN-1酶削减piRNAs以防止降解. 缺少PARN-1的虫产生新的反piRNAs,它们是piRNAs的反意义,并与Piwi蛋白结合在一起.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 在RNA生物学,RNA生物学.
背景情况:
- 皮维/皮维相互作用RNA (piRNA) 途径对于保持动物生殖系的基因组完整性至关重要.
- 皮RNA成熟需要在5'和3'端进行精确的核分解处理.
- PARN-1是一种核糖酶,在各种物种中调解piRNA 3'剪切,但其精确的作用仍然不完全理解.
研究的目的:
- 为了研究由PARN-1介导的piRNA 3'修剪的意义.
- 为了描述在parn-1突变体中积累的未注释的RNA物种.
- 阐明这些新型小RNAs生物发生的基础机制.
主要方法:
- 使用Caenorhabditis elegans作为一个模型生物.
- 在野生型和parn-1突变虫中分析了RNA种群.
- 研究了小RNA与Piwi蛋白质的关联.
- 描述了新型RNA物种的生物化学特性,包括大小和核酸组成.
主要成果:
- 缺乏PARN-1的虫积累了一种新的小RNA类型,称为反piRNAs,它们是piRNAs的反意义.
- 抗piRNA与Piwi蛋白相关,其长度从17-19个核酸,从关氨酸或腺氨酸开始.
- 未切割的前piRNAs被RDE-3和EGO-1异常处理,导致反-piRNA的形成.
结论:
- 在防止反感性RNAs (anti-piRNAs) 的积累方面,PARN-1-介导的3'修剪是必不可少的.
- 鉴定出抗piRNAs作为一种新的类型的小RNAs在缺乏适当的piRNA处理的情况下产生.
- 这项研究为PARN-1,RDE-3,EGO-1和Piwi蛋白在小RNA代谢和基因组防御中的作用提供了新的见解.
更多相关视频
相关概念视频
02:57piRNA - Piwi-interacting RNAs
6.9K
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
6.9K
01:43Proofreading
54.1K
Overview
54.1K
01:23RNA Interference
26.0K
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
26.0K
02:01pre-mRNA Processing
52.9K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
52.9K
01:35Pre-mRNA Processing: Modification of pre-mRNA Ends
9.3K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
9.3K
02:41Chromatin Structure Regulates pre-mRNA Processing
7.0K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
7.0K