替代拼接的TCR mRNA是由读取的破坏引起的
Jun Wang1, John I Hamilton, Mark S Carter
1Department of Immunology, The University of Texas M. D. Anderson Cancer Center, Box 180, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
概括
过早终止基因突变会产生有缺陷的蛋白质. 一项新的研究揭示了绕过这些突变的替代拼接机制,为基因表达控制提供了新的视角.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 免疫学 免疫学 免疫学
背景情况:
- 无意义的编码子过早地终止了蛋白质翻译,导致潜在的有害的截断蛋白质.
- 在淋巴细胞发育过程中,T细胞受体-β (TCRbeta) 基因经常获得内框架无意义编码.
研究的目的:
- 研究TCRbeta基因处理高频无意义编码子的机制.
- 了解如何替代拼接的转录是调节的响应翻译错误.
主要方法:
- 对淋巴细胞中的基因表达的分析.
- 替代拼接转录 (alt-mRNAs) 的识别和表征.
- 研究转移RNA (tRNA) 和读取完整性在调节alt-mRNA水平中的作用.
主要成果:
- TCRbeta基因产生一个跳过无意义编码子的alt-mRNA.
- 这种替代mRNA通过转移RNA依赖的扫描机制进行上调.
- 该机制特别响应破坏基因阅读框架的突变.
结论:
- 翻译信号可以调节核中的替代拼接mRNAs的产生.
- 这一发现可能会重塑目前对真核生物基因表达控制的理解.
- 确定了一种与翻译忠实度相关的新型RNA拼接调节途径.
相关概念视频
Translation
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Termination of Translation
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
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Translation
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...


