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相关概念视频

CRISPR/Cas9 Genome Editing01:28

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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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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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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Janice S Chen1, Yavuz S Dagdas2, Benjamin P Kleinstiver3,4,5

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新的CRISPR-Cas9变体 (SpCas9-HF1和eSpCas9 ((1.1)) 显示出减少的目标外影响. 一种新型的超精确变体 (HypaCas9) 已开发出来,可以提高基因组编辑的特异性,而不会损失目标活动.

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科学领域:

  • 分子生物学
  • 遗传学
  • 生物化学

背景情况:

  • 来自Streptococcus pyogenes (SpCas9) 的CRISPR-Cas9系统是一个强大的基因组编辑工具.
  • 现有的高保真变体 (SpCas9-HF1,eSpCas9(1.1) 减少了目标外裂变,但它们的目标区分机制尚不清楚.
  • 为了精确的基因组工程,还需要进一步提高Cas9的特异性.

研究的目的:

  • 阐明 SpCas9 变体中潜在的目标歧视机制.
  • 设计一种新的Cas9变种, 具有增强的特异性,
  • 开发一个精细的Cas9目标识别和核酶激活模型.

主要方法:

  • 用单分子弗斯特共振能量转移 (smFRET) 实验来研究SpCas9变体.
  • 使用生物物理技术分析标结合和形状变化.
  • 一种新的Cas9变体HypaCas9被设计并测试了全基因组特异性和目标活性.

主要成果:

  • 在结合不匹配的DNA点时,SpCas9-HF1和eSpCas9(1.1) 采用无活性状态.
  • Cas9 的 REC3 域在识别目标互补性和控制核酶活性方面发挥着关键作用.
  • 新设计的HypaCas9变种在人类细胞中表现出卓越的全基因组特异性和强大的目标编辑能力.

结论:

  • REC3域是基于目标DNA匹配的Cas9催化能力的关键调节器.
  • 了解这种机制可以合理设计更准确的CRISPR-Cas9工具.
  • HypaCas9代表了精确基因组编辑技术的重大进步.