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Updated: Jun 8, 2025

Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms
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Reducing competition between msd and genomic DNA improves retron editing efficiency.

Yuyang Ni1,2, Yifei Wang1, Xinyu Shi1

  • 1National Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, P. R. China.

EMBO Reports
|November 5, 2024
PubMed
Summary

Researchers optimized bacterial retrons for gene editing by engineering their msDNA synthesis. This improved efficiency for targeted prokaryotic gene modification using multicopy single-stranded DNA (msDNA).

Keywords:
Escherichia coliDNA ReplicationGene EditingRetron

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Area of Science:

  • Molecular Biology
  • Bacterial Genetics
  • Gene Editing Technologies

Background:

  • Retrons are bacterial defense systems producing multicopy single-stranded DNA (msDNA).
  • msDNA mimics Okazaki fragments, showing potential for prokaryotic gene editing.
  • Current retron systems face limitations in editing efficiency due to target gene homology.

Purpose of the Study:

  • To identify and address the bottleneck limiting retron-mediated gene editing efficiency.
  • To engineer an improved retron system for enhanced targeted gene editing in prokaryotes.

Main Methods:

  • Identified the msd gene in Escherichia coli as a critical factor in msDNA synthesis and target homology.
  • Engineered a retron system by tailoring msDNA to the leading strand of the plasmid.
  • Minimized msDNA binding to the msd gene to reduce competition with target genes.

Main Results:

  • The msd gene's sequence homology was identified as a key limitation for retron editing efficiency.
  • The engineered system significantly increased msDNA availability by minimizing msd gene editing.
  • Achieved substantially higher retron editing efficiency compared to existing systems.

Conclusions:

  • Optimizing msDNA targeting to specific DNA strands enhances retron system performance.
  • The engineered retron system offers a more efficient tool for prokaryotic gene editing.
  • This advancement expands possibilities for in vivo homologous DNA synthesis applications.