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Researchers enhanced prime editing (PE) tools using yeast-based evolution. The new PE_Y18 variant shows significantly increased genome editing efficiency in cells and in vivo, advancing gene editing technologies.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetics

Background:

  • Prime editing (PE) is a versatile genome editing technology.
  • Current prime editors (PEs) exhibit lower activity compared to traditional Cas9 nucleases.

Purpose of the Study:

  • To enhance the editing efficiency of prime editors (PEs) using a yeast-based platform for directed protein evolution.
  • To identify mutations that improve PE activity and create a more efficient prime editor variant.

Main Methods:

  • Utilized OrthoRep, a yeast-based platform, for directed evolution of prime editors.
  • Applied selection pressure over several rounds to identify beneficial mutations.
  • Combined top mutations (A259D in nCas9, K445T in M-MLV RT) to create the PE_Y18 variant.
  • Tested PE_Y18 in mammalian cell lines and in vivo models (liver, brain).

Main Results:

  • Identified multiple mutations enhancing PE activity in yeast and biochemical assays.
  • The PE_Y18 variant, incorporating two key mutations, increased editing rates up to 3.5-fold in mammalian cells compared to PEmax.
  • PE_Y18 demonstrated higher prime editing efficiency in vivo in the liver and brain.

Conclusions:

  • Directed evolution using OrthoRep successfully optimized prime editor efficiency.
  • The PE_Y18 variant represents a significant improvement in prime editing technology.
  • This study validates the use of OrthoRep for enhancing genome editing tools in eukaryotic systems.