相关实验视频
Updated: May 13, 2026

10:25
Using the E1A Minigene Tool to Study mRNA Splicing Changes
Published on: April 22, 2021
一些具有 cis 和 trans 作用的突变体用于将目标前mRNA 拼接到细胞质中
Cell
|May 19, 1989
概括
研究人员确定了关键的拼接因子,防止前信使RNA (前mRNA) 进入细胞质. 这些因素,包括U1小核RNA (snRNA),使mRNA前进行拼接,阻止其过早的运输.
科学领域:
- 分子生物学分子生物学
- 处理RNA处理RNA处理
- 基因表达规范 基因表达规范
背景情况:
- 在细胞质运输之前,必须准确地剪接预mRNA,以确保正确的蛋白质合成.
- 控制前mRNA与剪接途径的结合的机制尚未完全理解.
- 防止未连接的前mRNA过早出口的细胞质因素对于细胞忠实性至关重要.
研究的目的:
- 为了识别抑制前mRNA运输到细胞质的拼接因子.
- 阐明特定序列和因素在使前mRNA致力于拼接中的作用.
- 了解拼接因子如何阻止未拼接的前mRNA到达细胞质.
主要方法:
- 一个酵母合成内tron系统被改造成一个lacZ基因来监测前mRNA转化.
- 测试使用剪接连接序列 (GUAUGU) 和分支点序列 (UACUAAC) 的删除突变进行.
- 分析了突变菌株 (rna6,rna9) 和一个U1小核RNA (snRNA) 点突变菌株的拼接效率和mRNA前翻译.
主要成果:
- 删除5'拼接连接或分支点序列显著增加了mRNA前翻译,表明细胞质局部化.
- 在rna6和rna9突变中抑制拼接与增加的mRNA前转化相关.
- 一个U1 snRNA突变降低了拼接效率和提高了前mRNA转化.
结论:
- 早期起作用的因素,可能涉及U1 snRNA,RNA6和RNA9基因产物,与拼接序列相互作用.
- 这些相互作用将前mRNA与拼接途径结合起来.
- 这种承诺有效地防止了前mRNA到细胞质的过早运输.
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...
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...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
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...

