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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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型肝炎病毒RNA功能性分离器miR-12222

Joseph M Luna1, Troels K H Scheel2, Tal Danino3

  • 1Laboratory of Virology and Infectious Disease, Center for the Study of Hepatitis C, The Rockefeller University, New York, NY 10065, USA; Laboratory of Molecular Neuro-Oncology and Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA.

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此摘要是机器生成的。

型肝炎病毒 (HCV) 劫持肝脏特异性的microRNA-122 (miR-122),降低了它对宿主目标的可用性. 这种由HCVRNA的封存可能通过去抑制宿主基因来促进长期的致癌潜力.

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科学领域:

  • 病毒学 病毒学
  • 分子生物学分子生物学
  • 肝病学 肝病学是一种肝病学.

背景情况:

  • 肝炎C病毒 (HCV) 的复制取决于肝脏特异性的microRNA-122 (miR-122).
  • 感染HCV对宿主转录组内内源性microRNA (miRNA) 点的影响在很大程度上是未知的.

研究的目的:

  • 研究HCV感染对宿主miRNA点的全球影响,特别是由miR-122.2调节的点.
  • 探索HCVRNA与miR-122相互作用的机制及其对宿主基因表达的影响.

主要方法:

  • 高通量测序和交叉链接免疫沉 (HITS-CLIP) 来绘制感染期间在HCVRNA和人类转录组上的阿尔戈诺特 (AGO) 结合位点.
  • 在HCV感染细胞中分析miR-122点的mRNA去抑制.
  • 通过交换miRNA结合部位来对病毒miRNA热带的实验性操纵.
  • 使用含有miR-122结合点的记者系统进行单细胞表达分析.
  • 对HCV诱导的miR-122封存进行定量数学模型的开发.

主要成果:

  • 在HCV5'非翻译区域 (UTR) 中,在miR-122位点表现出强大的AGO结合,这表明直接相互作用.
  • 感染HCV导致AGO对内源性miR-122标的结合减少,并显著地减轻mRNA抑制.
  • 改变病毒miRNA热带性将分离效应从miR-122转移到其他miRNA,如miR-15.
  • 单细胞数据证实了在HCV感染期间的miR-122位去抑制,与表达水平和miR-122结合位数相关.

结论:

  • 型冠状病毒RNA充当分子海绵,隔离miR-122并破坏其正常功能.
  • 这种封存导致了广泛的宿主miR-122目标的去压制.
  • 该研究提出,这种机制可能通过创造亲瘤细胞环境,有助于慢性HCV感染的致癌潜力.