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Using Sniper-Cas9 to Minimize Off-target Effects of CRISPR-Cas9 Without the Loss of On-target Activity Via Directed Evolution
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Continuous evolution of base editors with expanded target compatibility and improved activity.

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Phage-assisted continuous evolution rapidly improved base editors (BEs) for DNA point mutation installation. Evolved cytosine base editors show enhanced efficiency and broader target compatibility, advancing genome editing technologies.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Base editors (BEs) precisely install point mutations using targeted DNA-modifying enzymes and catalytically impaired CRISPR systems.
  • Improving BE efficiency and expanding target sequence compatibility remain key challenges in genome editing.

Purpose of the Study:

  • To develop phage-assisted continuous evolution of base editors (BE-PACE) for enhanced editing efficiency and target sequence compatibility.
  • To evolve novel base editors that overcome limitations of existing cytosine base editors (CBEs).

Main Methods:

  • Phage-assisted continuous evolution (PACE) was employed to evolve base editors.
  • The evolved editors were characterized for editing efficiency, target sequence compatibility, and deaminase activity.

Main Results:

  • BE-PACE successfully evolved cytosine base editors (CBEs) with improved performance.
  • One evolved CBE, evoAPOBEC1-BE4max, demonstrated up to 26-fold increased efficiency in the GC context.
  • A smaller, highly efficient deaminase, evoFERNY, and a more efficient CBE based on CDA1 were also developed.

Conclusions:

  • BE-PACE provides a robust system for the rapid evolution of base editors.
  • The evolved editors offer enhanced efficiency and broader applicability for precise genome editing.
  • Findings illuminate deaminase activity-efficiency relationships, informing future base editor design and improvement.