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相关概念视频

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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
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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.
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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...
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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.
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相关实验视频

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Author Spotlight: Exploring the Frontier of mRNA Research with Poly A Tail Analysis Techniques
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聚氨酸中的N6甲基氨酸稳定VSG转录

Idálio J Viegas1, Juan Pereira de Macedo1, Lúcia Serra1

  • 1Instituto de Medicina Molecular-João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal.

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|March 31, 2022
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概括

在Trypanosoma brucei中,N6-甲基氨酸 (m6A) 基因修饰调节基因表达,特别是在变异性表面糖蛋白转录的多元A尾部内,影响mRNA的稳定性.

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科学领域:

  • 分子生物学
  • 寄生虫学
  • 核糖核酸生物学

背景情况:

  • 在Trypanosoma brucei中,基因表达主要是由于其多晶体转录而通过转录后进行调节的.
  • 在Trypanosoma brucei中发现了N6-甲基氨酸 (m6A),但其功能性作用尚不清楚.

研究的目的:

  • 在Trypanosoma brucei中研究m6ARNA修饰的功能.
  • 识别与m6A修改相关的转录和监管元素.

主要方法:

  • 通过RNA免疫沉识别m6A丰富的转录物.
  • 计算分析以确定与m6A相关的序列动机.
  • 基因操纵以评估在m6A调控中发现的动机的作用.

主要成果:

  • m6A修饰在342个转录中得到丰富,包括编码变异表面糖蛋白 (VSG) 的转录.
  • 大约50%的m6A存在于VSG转录的poly(A) 尾部,在降解之前被删除.
  • 在VSG基因的3'未翻译区域中的16-mer基因对m6A纳入多元A尾部至关重要.

结论:

  • 这项研究确定了真核mRNA的多元A尾部内的m6A修饰,这是转录后基因调节的新机制.
  • 作为一个控制m6A结合和随后的mRNA稳定性的cis-acting元素,16-mer动机在Trypanosoma brucei中起作用.