相关实验视频
Updated: May 14, 2026

08:53
A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
Published on: September 15, 2021
停滞不前的结合酶体是RNAi介导的基因组防御信号
Phillip A Dumesic1, Prashanthi Natarajan, Changbin Chen
1Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.
Cell
|February 19, 2013
概括
研究人员发现了酵母如何利用RNA干扰 (RNAi) 针对基因组防御的转子. 包含中子的转录停滞在结合体模板上的小干扰RNA (siRNA) 合成,由SCANR复合体介导.
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干扰过程中,RNA干扰
背景情况:
- 转子子对基因组稳定性构成威胁.
- RNA干扰 (RNAi) 是基因组防御的一个关键机制.
- 对于RNAi的转子的初始向仍然不完全理解.
研究的目的:
- 阐明转子子最初针对酵母中RNAi介导的基因组防御的机制.
- 为了确定参与RNAi对转子子的启动的因素.
主要方法:
- 使用了酵母Cryptococcus neoformans模型系统.
- 研究了mRNA前体和spliceosomes在siRNA合成中的作用.
- 鉴定和表征了Spliceosome-Coupled 和核RNAi (SCANR) 复合体.
- 进行了功能性测试,以评估用于siRNA生产的拼接中间体和拉里亚特脱枝酶的必要性.
主要成果:
- 含有中子的mRNA前体作为siRNA合成的模板.
- 一个新型的Spliceosome-Coupled And Nuclear RNAi (SCANR) 复合体与spliceosome物理相关,对siRNA合成至关重要.
- 由RNAi准的转录表现出低于最佳的内子和高的结合酶体占用率.
- 在spliceosomes上的mRNA前体的停滞对于siRNA积累至关重要.
- 拉里亚特脱枝酶是siRNA生产所需的,这表明它在处理停滞的拼接中间体方面发挥了作用.
结论:
- 转子子的RNAi向是通过识别停滞的拼接中间体开始的.
- 该SCANR复合体在动态上与剪接相竞争,以促进从转子子转录录中产生siRNA.
- 转子子和宿主基因之间的差异表达信号可能会推动这种基因组防御策略的演变.
相关概念视频
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Interference
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...
RNA Interference
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...
Pre-mRNA Processing: RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
