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  • 1Hunan Provincial Key Laboratory for Microbial Molecular Biology-State Key Laboratory Breeding Base of Microbial Molecular Biology, College of Life Science, Hunan Normal University, 410081 Changsha, People's Republic of China, Department of Genomics, Dresden University of Technology, BioInnovations-Zentrum, Tatzberg 47-51, 01307 Dresden, Germany, Shandong University-Helmholtz Joint Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Shanda Nanlu 27, 250100 Jinan, People's Republic of China, Helmholtz Institute for Pharmaceutical Research, Helmholtz Centre for Infection Research and Department of Pharmaceutical Biotechnology, Saarland University, PO Box 151150, 66041 Saarbrücken, Germany and Gene Bridges GmbH, Building C2.3, Saarland University, 66123 Saarbrücken, Germany.

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Summary

This study introduces CcdB counterselection for seamless DNA engineering in Escherichia coli recombineering. This robust method enhances efficiency for various DNA targets, including plasmids and the E. coli chromosome.

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Genetics

Background:

  • Recombineering in Escherichia coli typically relies on antibiotic selection for identifying recombinant DNA molecules.
  • Counterselection using toxins offers a method for obtaining seamless genetic modifications.
  • The CcdB toxin-antidote system presents a potential counterselection agent.

Purpose of the Study:

  • To evaluate the utility of CcdB as a counterselectable agent in recombineering.
  • To develop and optimize CcdB counterselection strategies for different DNA targets.
  • To improve the efficiency and seamlessness of DNA engineering via recombineering.

Main Methods:

  • Utilized homologous recombination in Escherichia coli (recombineering).
  • Implemented CcdB counterselection by controlling the expression of the CcdB toxin and its antidote, CcdA.
  • Developed two variations of CcdB counterselection: one for multi-copy targets using host transformation and another for single-copy targets employing a temperature-sensitive plasmid.
  • Combined CcdB counterselection with Redα omission to minimize intramolecular recombination.

Main Results:

  • Demonstrated that CcdB counterselection is robust and does not require extensive optimization.
  • Successfully applied CcdB counterselection to multi-copy plasmids and single-copy targets on the E. coli chromosome.
  • Showed that CcdB counterselection can be integrated with other recombineering techniques, such as Redα omission, for improved outcomes.
  • Achieved seamless DNA modifications across various genetic elements, including BACs, plasmids, and the E. coli chromosome.

Conclusions:

  • CcdB counterselection provides an efficient and versatile strategy for seamless DNA engineering in recombineering.
  • The described methods offer adaptable solutions for counterselection based on target copy number.
  • This approach enhances the utility of recombineering for complex genetic manipulations in Escherichia coli.