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Loop engineering improves prime editing efficiency.

Bailun Li1,2,3, Zhike Lu2,3,4, Ting Zhou1,2,3

  • 1College of Life Sciences, Zhejiang University, Hangzhou 310058, China.

Molecular Therapy. Nucleic Acids
|December 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers improved prime editing (PE) efficiency by optimizing the primer binding site (PBS) and reverse transcription template (RTT) sequence. Adding an extra PBS-RTT copy to the pegRNA significantly boosted editing outcomes, enhancing PE

Keywords:
MT: RNA/DNA EditingPBS-RTTlocal concentrationpegRNAprime editingsteric hindrance

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Area of Science:

  • Molecular Biology
  • Gene Editing Technologies
  • Biotechnology

Background:

  • Prime editing (PE) is a versatile gene editing tool with significant translational potential.
  • PE's editing efficiency is often lower than other systems like Cas9 or base editors (BE).
  • Limited availability of the primer binding site (PBS) and reverse transcription template (RTT) on the pegRNA is a suspected bottleneck for PE efficiency.

Purpose of the Study:

  • To investigate the impact of PBS-RTT sequence position and copy number on prime editing efficiency.
  • To identify strategies for enhancing PE editing performance by optimizing pegRNA structure.
  • To overcome limitations in PE efficiency for broader therapeutic applications.

Main Methods:

  • Systematic modification of pegRNA structure by inserting additional PBS-RTT sequences.
  • Testing different insertion sites for PBS-RTT, including loop 2, tetraloop, and the 3' end.
  • Relocating the 3' PBS-RTT to internal stem-loops within the sgRNA scaffold.
  • Evaluating editing efficiency across diverse target sites and cellular contexts.

Main Results:

  • Incorporating an extra PBS-RTT copy into loop 2 of the pegRNA significantly increased PE editing efficiency (40%-147%).
  • Modifications to the tetraloop or 3' end did not yield comparable efficiency improvements.
  • The position of the PBS-RTT sequence critically influences its accessibility and PE activity.
  • Enhanced PBS-RTT availability addresses a key limitation in PE technology.

Conclusions:

  • Optimizing PBS-RTT availability and accessibility is crucial for enhancing prime editing efficiency.
  • The strategy of adding an extra PBS-RTT copy to specific pegRNA regions offers a practical method to improve PE performance.
  • This approach has the potential to expand the utility of prime editing in translational medicine and therapeutic development.