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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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Directed Evolution of CRISPR-Cas9 Base Editors.

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Phage-assisted continuous evolution (PACE) generated improved CRISPR-Cas9 base editors. These new editors overcome limitations like sequence preferences and large sizes, advancing gene editing technology.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetics

Background:

  • CRISPR-Cas9 base editors offer precise genome editing capabilities.
  • Existing base editors face limitations including sequence context specificity, editing window restrictions, and large construct sizes.
  • Directed evolution presents a powerful strategy for protein engineering and optimizing enzyme function.

Purpose of the Study:

  • To develop enhanced CRISPR-Cas9 base editors with improved functionalities.
  • To overcome inherent limitations of current base editing technologies.
  • To demonstrate the utility of phage-assisted continuous evolution (PACE) for protein engineering in gene editing.

Main Methods:

  • Utilized phage-assisted continuous evolution (PACE), a high-throughput directed evolution system.
  • Applied PACE to evolve CRISPR-Cas9 base editor variants.
  • Characterized the evolved base editors for their performance and properties.

Main Results:

  • Generated novel CRISPR-Cas9 base editor variants with enhanced performance.
  • Demonstrated that evolved base editors exhibit reduced sequence context preferences.
  • Showcased improvements in editing window flexibility and reduced construct sizes for the engineered editors.

Conclusions:

  • PACE is an effective system for rapidly evolving CRISPR-Cas9 base editors.
  • The evolved base editors represent significant advancements over existing technologies.
  • These improved base editors hold promise for broader and more efficient genome engineering applications.