揭示Epitranscriptome:对mRNA修饰和新兴边界的审查
1Department of Obstetrics and Gynecology, C. S. Mott Center for Human Growth and Development, Institute of Environmental Health Sciences, Wayne State University, Detroit, MI 48201, USA.
Genes
|August 28, 2025
概括
传递 RNA (mRNA) 的修改对于基因表达至关重要,但仍未得到充分研究. 这篇评论列出了已知的mRNA修改,强调N6-甲基氨酸 (m6A) 是最受研究和探索环境RNA (eRNA) 表谱学等新领域的.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- 存在超过300种RNA修饰,但传递RNA (mRNA) 的修饰比转移RNA (tRNA) 和核糖体RNA (rRNA) 的修饰少.
- mRNA的修改调节了基因表达的基本过程,如拼接,翻译和稳定性.
- 了解mRNA修饰是解读基因调节层的关键.
研究的目的:
- 根据出版频率系统地审查和排名15种自然发生的mRNA修饰.
- 突出表转录学新兴领域,包括新型mRNA修饰和环境RNA (eRNA) 表转录学.
- 分析关键的修改 (m6A,m5C, Ψ,m1A) 关于它们的酶机制,功能和相关性.
主要方法:
- 对PubMed索引的出版物进行了结构化的文献审查,以确定mRNA修改的引用率.
- 分析了酶机制 ("写入器"",删除器"",读取器"),分子功能和关键mRNA修改的生理相关性.
- 审查了技术进步,专注于纳米孔测序,以检测本地和环境环境中的RNA修饰.
主要成果:
- N6-甲基氨酸 (m6A) 是研究最多的mRNA修改,其次是伪尿素 (Ψ),5-甲基氨酸 (m5C) 和A-to-I编辑.
- 这些修改影响了mRNA翻译效率,局部化,免疫逃避,转录稳定性和先天免疫调节.
- 纳米孔测序可以直接检测RNA的修饰,并对eRNA调查有希望.
结论:
- mRNA 修改是基因调节的一个关键层,但尚未完全理解.
- 持续的研究,特别是使用纳米孔测序和机器学习,对于充分阐明它们的生物学意义至关重要.
- 探索eRNA和发现新的mRNA修饰将大大提高我们对RNA生物学的理解.
相关概念视频
02:01pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
02:01Pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
02:24Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
02:23RNA Editing
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
02:24Ribosome Profiling
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 helps...
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 helps...
01:35Pre-mRNA Processing: Modification of pre-mRNA Ends
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...