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相关概念视频

Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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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.
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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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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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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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相关实验视频

Updated: Jul 19, 2025

Dual CRISPR-Interference Strategy for Targeting Synthetic Lethal Interactions Between Non-Coding RNAs in Cancer Cells
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与Cre-loxP系统相比,CRISPR干扰提供了较高的细胞类型特异性.

Dominique J Laster1, Nisreen S Akel1, James A Hendrixson1

  • 1Department of Physiology and Cell Biology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.

iScience
|August 14, 2023
PubMed
概括

这项研究引入了一种新的CRISPR干扰 (CRISPRi) 方法,用于在特定细胞类型中精确的基因沉默. 与传统的Cre-loxP系统相比,这种新技术提供了优越的细胞特异性基因淘汰.

关键词:
遗传学 遗传学是一种遗传学.分子遗传学 分子遗传学

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科学领域:

  • 遗传学和基因组学 遗传学和基因组学
  • 分子生物学分子生物学
  • 发展生物学 发展生物学

背景情况:

  • 创造介导的重组是细胞类型特异性功能丧失 (LOF) 研究的常见工具.
  • 克雷-洛克斯P系统的一个重大缺点是非预期细胞群中的非目标重组.
  • 克里斯普尔干扰 (CRISPRi) 已被证明对全球基因淘汰有效,但对于特定细胞类型的应用并不有效.

研究的目的:

  • 建立和验证一种新的CRISPR干扰 (CRISPRi) 系统,用于细胞类型特定的基因敲除.
  • 为了比较CRISPRi介导的LOF与已建立的Cre-loxP系统的细胞类型特异性和有效性.
  • 开发新的小鼠模型,用于诱导性和细胞特异性基因操纵.

主要方法:

  • 开发了两种用于CRISPRi介导的基因抑制的新型鼠标模拟模型.
  • 一种模型在细胞类型特定的促进体下表达dCas9::KRAB;另一种模型表达来自安全港的单一导向RNA.
  • 使用CRISPRi与Cre-loxP系统对基因向表型进行比较,特异性由Dmp1调控元素驱动.

主要成果:

  • 成功实施CRISPRi以实现细胞类型特定的方式抑制基因.
  • 与Cre-loxP系统相比,CRISPRi显示了增强的细胞类型特异性.
  • 现型分析证实了CRISPRi在向基因LOF研究中的有效性.

结论:

  • 特定于细胞类型的CRISPRi是基因功能丧失研究的可行和有效策略.
  • 开发的CRISPRi系统比传统的Cre-loxP重组方法提供了更高的细胞类型特异性.
  • 这一进步为研究特定细胞环境中的基因功能提供了更精确的工具.