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Phage peptides mediate precision base editing with focused targeting window.

Kun Jia1,2,3, Yan-Ru Cui1,4, Shisheng Huang1,4

  • 1Shanghai Institute for Advanced Immunochemical Studies and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China.

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Summary
This summary is machine-generated.

A novel peptide modulator, G8PPD, enhances base editors (BEs) for precise gene editing. This technology significantly improves the accuracy of base editing in disease models and expands its scope in embryos.

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Area of Science:

  • Molecular Biology
  • Genome Engineering
  • Biotechnology

Background:

  • Base editors (BEs) are advanced genome engineering tools enabling nucleotide substitutions without double-stranded breaks (DSBs).
  • Existing strategies aim to broaden the targeting scope and window of BEs for enhanced functionality.
  • A bacteriophage-derived peptide, G8PPD, was previously identified to enhance Cas9 nuclease specificity.

Purpose of the Study:

  • To investigate the potential of G8PPD as a molecular modulator for improving base editor (BE) performance.
  • To assess the impact of G8PPD on the targeting scope and precision of cytidine base editors (CBEs) and adenine base editors (ABEs).

Main Methods:

  • Evaluation of G8PPD's effect on CBE and ABE targeting windows in cellular systems.
  • Assessment of G8PPD-enhanced BEs in a cell-based disease model.
  • Testing G8PPD's ability to improve BE targeting scope in mouse embryos.

Main Results:

  • G8PPD effectively narrowed the targeting windows for both CBEs and ABEs.
  • In a cellular disease model, G8PPD increased perfectly edited gene alleles from <4% to >38%.
  • G8PPD demonstrated improved targeting scope for BEs in mouse embryos.

Conclusions:

  • G8PPD serves as an effective peptidyl modulator for enhancing base editor precision.
  • This peptide modulator significantly improves the efficiency and accuracy of base editing applications.
  • The findings present a novel strategy for advancing precision genome engineering with base editors.