在RBMXL1 5'-UTR中的替代拼接诱导了激活B淋巴细胞中的uORF介导的翻译控制
Sylvain de Breyne1, Hélène Polvèche2, Didier Auboeuf3
1CIRI, International Center for Infectiology Research, RNA Expression in Viruses and Eukaryotes (REVE) Team, INSERM U1111, CNRS UMR5308, ENS de Lyon, Université Lyon I, 69007, Lyon, France. sylvain.de.breyne@ens-lyon.fr.
Scientific reports
|July 2, 2025
概括
在RBMXL1基因中,一个新发现的替代拼接事件创建了一个小的上游开放阅读框架 (uORF). 这种功能性uORF下调下游蛋白转化,影响细胞中的RBMX/RBMXL1水平.
科学领域:
- 分子生物学分子生物学
- 基因法规 基因法规
背景情况:
- 结合X基因的RNA结合基因 (RBMX) 基因对于基因转录和替代拼接至关重要,与癌症相关的改变表达.
- 包括RBMXL1在内的RBMX-like基因 (RBMXLs) 是由RBMX的逆转换产生的,并且具有高度的蛋白质特征,这表明它们具有类似的功能.
研究的目的:
- 研究RBMXL1基因中的替代拼接变异.
- 为了确定RBMXL1mRNA中特定的替代拼接事件的功能影响.
主要方法:
- 在人类RBMXL1 mRNA中进行替代拼接的分析.
- 在埃普斯坦-巴尔病毒 (EBV) 感染或B淋巴细胞激活后对RBMXL1mRNA拼接的研究.
- 通过替代拼接生成的上游开放阅读框架 (uORF) 的功能评估.
主要成果:
- 在人类RBMXL1mRNA的5'-未翻译区域中确定了一种特定的替代拼接事件.
- 在EBV感染或B细胞激活后观察到的这种拼接变异引入了一个小的外形.
- 由此产生的RBMXL1 uORF被发现是功能性的,降低了主要下游开放阅读框架的翻译.
结论:
- 确定了RBMXL1的替代拼接,产生了一个功能性的uORF,抑制下游翻译.
- 这种调节机制可能在微调RBMX和RBMXL1蛋白质的细胞水平方面发挥作用.
相关概念视频
Alternative RNA Splicing
21.7K
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...
21.7K
RNA Splicing
57.1K
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...
57.1K
Leaky Scanning
5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K
Ribosome Profiling
3.6K
Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
3.6K
Initiation of Translation
34.6K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
34.6K
Regulation of Expression at Multiple Steps
1.0K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.0K


