相关实验视频
Updated: May 20, 2026

08:53
A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
Published on: September 15, 2021
U1 snRNP决定了mRNA的长度,并调节了同位体表达的过程
Michael G Berg1, Larry N Singh, Ihab Younis
1Howard Hughes Medical Institute, USA.
Cell
|July 10, 2012
概括
U1 snRNP (U1) 保护基因免受过早终止. 适度的U1减少会导致mRNA缩短和外子切换,影响神经元激活和癌症等细胞状态.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 处理RNA处理RNA处理
背景情况:
- U1 snRNP (U1) 对于剪接和预防过早的转录终止至关重要.
- 在加密的多化信号 (PAS) 上的裂变和多化 (PCPA) 可以过早终止转录.
- 在内部PAS中,U1在规范PCPA中的作用尚未完全被理解.
研究的目的:
- 研究U1 snRNP水平对PCPA和mRNA 3'端形成的全基因组影响.
- 探索PCPA在不同细胞环境中的U1介导调节的功能后果.
- 阐明U1抵制共转录PCPA的机制.
主要方法:
- 开发和应用差异表达转录的高通量测序策略 (HIDE-seq) 来绘制全基因组PCPA位点的地图.
- 在细胞模型中对U1 snRNP水平的实验操纵.
- 通过改变U1水平来总结与神经元激活相关的mRNA缩短.
主要成果:
- U1 枯竭导致大多数新生转录在 ~ 1 kb 内的过早终止.
- 适度的U1水平下降,没有抑制拼接,剂量依赖的PCPA下游转移.
- 这种转变导致mRNA 3' UTR缩短和3'外因子切换,在激活的免疫/神经元细胞,干细胞和癌症中观察到.
- 神经元激活诱导的mRNA缩短被U1减少模仿,并被U1过度表达逆转.
- 提出了一种名为"远程编写"的新机制,其中U1与新生转录的关联对抗共转录PCPA.
结论:
- U1 snRNP在防止PCPA在加密PAS中过早终止转录方面发挥着至关重要的作用.
- 动态调节U1水平,特别是在神经元激活等快速细胞反应期间,显著影响mRNA 3'端处理,导致3' UTR缩短和外子切换.
- 远程转录是一种新的机制,通过U1与新生转录的共同转录关联来确保转录组完整性和调节mRNA长度.
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...
Chromatin Structure Regulates pre-mRNA Processing
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...
Translational Regulation
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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...
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...

