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相关概念视频

Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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Nuclear Export of mRNA02:31

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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mRNA Stability and Gene Expression02:51

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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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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.
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RNA Stability01:53

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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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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Measurement of mRNA Decay Rates in Saccharomyces cerevisiae Using rpb1-1 Strains
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细胞类型和因子特定的无意义介导RNA衰变.

Kun Tan1, Jonathan Sebat2,3, Miles F Wilkinson1,3

  • 1Department of Obstetrics, Gynecology, and Reproductive Sciences, School of Medicine, University of California San Diego, La Jolla, CA 92093, United States.

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概括

细胞环境,而不仅仅是mRNA特征,决定了无意义介导RNA衰变 (NMD) 的敏感性. 在人类神经发育过程中,数百个信使RNA (mRNA) 改变了它们的NMD向,揭示了上下文依赖调节.

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科学领域:

  • 分子生物学分子生物学
  • 发展生物学 发展生物学
  • 遗传学 遗传学是一种遗传学.

背景情况:

  • 无意义介导的RNA衰变 (NMD) 是一种关键的RNA监测途径.
  • NMD针对特定的信使RNA (mRNA) 进行降解,从而影响基因表达.
  • 以前,人们认为NMD敏感性是mRNA序列的内在属性.

研究的目的:

  • 调查细胞环境在确定NMD敏感性的作用.
  • 在人类胚胎干细胞分化成神经前代细胞过程中识别由NMD调节的mRNA.
  • 探索NMD因素及其目标的特异性.

主要方法:

  • 全基因组技术来检测NMD目标mRNAs.
  • 在人类干细胞分化过程中分析mRNA变化.
  • 研究RNA结合蛋白HNRNPL.的功能.
  • 对NMD因素UPF3B和UPF2目标进行比较分析.

主要成果:

  • 细胞环境,而不仅仅是mRNA序列,是NMD敏感性的关键决定因素.
  • 数以百计的mRNA在人类干细胞过程中将NMD敏感性转移到神经前代细胞分化.
  • RNA结合蛋白HNRNPL在细胞类型特定的NMD中起作用.
  • 与核心NMD因子UPF2.2相比,NMD因子UPF3B规范了一组不同的目标.

结论:

  • NMD 调节是动态的,受细胞环境的影响.
  • 发育过渡显著改变了mRNAs的NMD向.
  • NMD通过不同的分支机构运作,具有专门的角色,影响人类疾病.