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Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems

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An Integrated System for Precise Genome Modification in Escherichia coli.

Huseyin Tas¹, Cac T Nguyen², Ravish Patel³

¹Center for the Physics of Living Cells, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America; Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America.

|September 3, 2015

Summary

This study presents an optimized system for precise Escherichia coli genome editing. The method enables seamless DNA integration and deletion without antibiotic markers, simplifying genetic modifications.

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Area of Science:

Microbiology
Molecular Biology
Genetics

Background:

Precise genome engineering in Escherichia coli is crucial for synthetic biology and fundamental research.
Existing methods often involve antibiotic selection or leave residual sequences, complicating downstream applications.

Purpose of the Study:

To develop an optimized, scarless system for efficient and precise genome modification in Escherichia coli.
To enable seamless DNA integration, deletion, and gene fusion without antibiotic markers.

Main Methods:

Integration of a 'Landing Pad' (tetA or galK) for initial genome alteration.
Excision of the Landing Pad using I-SceI homing endonuclease and λ-Red mediated homologous recombination.
Counterselection against the Landing Pad using NiCl2 or 2-deoxy-galactose for marker-free selection.

Main Results:

Demonstrated precise, scarless integration of the lac operon (~6.5 kbp) at desired genomic locations.
Achieved scarless deletion of ribosomal rrn operons (~6 kbp) via intrachromosomal or oligonucleotide recombination.
Successfully performed in situ fusion of native genes to fluorescent reporter genes without additional perturbations.

Conclusions:

The developed system offers an easy, effective, and precise method for Escherichia coli genome engineering.
This approach facilitates marker-free genetic modifications, enhancing the utility of engineered strains.