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Updated: Dec 3, 2025

Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems
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Optimization of T4 phage engineering via CRISPR/Cas9.

Michelle M Duong1, Caitlin M Carmody1, Qinqin Ma1,2

  • 1Department of Food Science and Technology, Cornell University, Ithaca, NY, 14853, USA.

Scientific Reports
|October 27, 2020
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Summary

This study introduces an improved CRISPR/Cas9 method for T4 phage engineering, achieving over 99% genomic editing rates. This breakthrough enhances synthetic phage applications in medicine and industry.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Microbial Genetics

Background:

  • Phage engineering is crucial for medical and industrial applications but limited by inefficient platforms.
  • Classical and current T4 phage engineering methods yield low and inconsistent genomic editing rates (0.03-3%).

Purpose of the Study:

  • To present an enhanced CRISPR/Cas9 technique for T4 phage genome engineering.
  • To identify and address rate-limiting factors in CRISPR/Cas9 mediated phage editing.

Main Methods:

  • Review of CRISPR/Cas9 mechanisms in phage engineering.
  • Optimization of crRNA selection for improved editing efficiency.
  • Application of the enhanced CRISPR/Cas9 system to T4 phage genome modification.

Main Results:

  • CRISPR/Cas9 assisted genome engineering significantly boosts T4 phage editing rates.
  • crRNA selection identified as a critical factor influencing editing efficiency.
  • Achieved genomic editing rates exceeding 99% for multiple target genes.

Conclusions:

  • The optimized CRISPR/Cas9 platform dramatically improves T4 phage engineering efficiency.
  • This advancement is expected to accelerate personalized phage therapy, biocontrol, and diagnostics.
  • Efficient synthetic phage development is now more attainable for diverse applications.