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相关概念视频

Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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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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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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针对SARS-CoV-2的转补系统重复了无毒性的真实病毒复制

Xianwen Zhang1, Yang Liu1, Jianying Liu2

  • 1Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, USA.

Cell
|March 10, 2021
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概括

研究人员在BSL-2实验室中开发了一种安全的方法来研究严重急性呼吸系统冠状病毒2 (SARS-CoV-2). 该系统产生单一的传染性病毒,使得高通量研究和抗病毒测试无需BSL-3制.

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美国冠状病毒抗病毒药物冠状病毒诊断情况疫苗的使用

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科学领域:

  • 病毒学
  • 分子生物学
  • 传染性疾病

背景情况:

  • 培养严重急性呼吸系统冠状病毒2 (SARS-CoV-2) 的高生物安全水平3 (BSL-3) 要求对广泛的研究和药物开发构成重大障碍.
  • 开发安全高效的SARS-CoV-2研究方法对于了解其病变和创建有效的对策至关重要.

研究的目的:

  • 为产生单一传染性SARS-CoV-2建立一个转补系统.
  • 在BSL-2实验室环境中实现高吞吐量中和SARS-CoV-2的抗病毒检测.
  • 为SARS-CoV-2研究提供比传统的BSL-3培养方法更安全的替代方法.

主要方法:

  • 设计了一种由两个组成部分组成的转补系统,包括具有特定基因缺失的基因组病毒RNA和表达被删除基因的生产细胞系.
  • 该系统产生能够在原始细胞中单次感染的病毒,防止野生型SARS-CoV-2的产生.
  • 通过注射K18-hACE2转基因小鼠与补充衍生的病毒来评估体内安全性.

主要成果:

  • 转补系统成功地产生了一轮传染性SARS-CoV-2,使其重复真实病毒复制.
  • 这些工程病毒可以在BSL-2实验室安全地用于中和抗病毒检测.
  • 动物研究涉及子和K18-hACE2转基因小鼠,即使在高剂量中,也没有发现可检测的疾病.

结论:

  • 开发的转补平台为在BSL-2环境中研究SARS-CoV-2提供了一种安全有效的方法.
  • 这种系统显著减少了生物安全瓶,促进了高吞吐量研究和新型抗病毒策略的开发.
  • 这些发现支持该平台的更广泛应用,以加快SARS-CoV-2对策的开发.