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相关概念视频

CRISPR and crRNAs02:53

CRISPR and crRNAs

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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CRISPR01:59

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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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相关实验视频

Updated: May 22, 2025

Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
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在无细胞系统中研究CRISPR核蛋白位移的研究.

Randi L Smith1, Peter W Davenport2,1, Matthew R Lakin2,3

  • 1Center for Biomedical Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States.

ACS omega
|March 17, 2025
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概括

克里斯普尔/卡斯系统提供精确的基因控制. 研究人员探索使用RNA链位移来从DNA中去除CRISPR相关的 (Cas) 蛋白质,但在无细胞系统中发现dCas9对这种方法有抗性.

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Substrate Generation for Endonucleases of CRISPR/Cas Systems
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相关实验视频

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科学领域:

  • 合成生物学 合成生物学
  • 分子生物学分子生物学
  • 生物化学 生物化学

背景情况:

  • 克里斯普尔/卡斯系统是用于控制细胞和无细胞环境中的基因表达的可编程工具.
  • RNA工程为CRISPR/Cas转录因子活动的动态控制提供了潜力.
  • 使用催化无活性dCas9的CRISPR干扰 (CRISPRi) 是一种抑制基因表达的方法.

研究的目的:

  • 在无细胞系统中研究使用RNA链移位系统从目标DNA中去除CRISPR/Cas核糖核蛋白复合物.
  • 为了设计一个反意义RNA,通过链位移触发结合CRISPR/Cas核糖核蛋白的快速去除.
  • 评估RNA链位移对于dCas9结合的动态控制的有效性.

主要方法:

  • 使用基于大肠杆菌的细胞自由表达系统.
  • 设计了一个带有延伸脚的指导RNA.
  • 表达了一种辅助向导RNA的抗意义RNA,以诱导链位移.
  • 通过CRISPR干扰抑制记者蛋白的监控dCas9结合.

主要成果:

  • 克里斯普尔/卡斯核糖核蛋白复合体,特别是dCas9,表现出显著的抵抗力,无法通过设计的RNA链移位系统去除.
  • 在无细胞系统中,反意义RNA并没有有效地从目标DNA中取代结合的dCas9.
  • 这项研究强调了在这些条件下dCas9结合的意想不到的稳定性.

结论:

  • 实现的RNA链位移并不是在无细胞系统中动态去除绑定dCas9的有效策略.
  • 观察到的dCas9的耐药性表明这种方法对于快速,按需关闭CRISPR/Cas转录因子的限制.
  • 为了在工程遗传网络中实现CRISPR/Cas蛋白的动态控制和有效去除,可能需要采用替代策略.