Donor plasmids for phenotypically neutral chromosomal gene insertions in Enterobacteriaceae

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• Recombineering with bacteriophage lambda Red recombinase (λ-Red) is a key technique for bacterial genome manipulation.
• Gene disruption via recombineering is often complemented by plasmid-based gene reintroduction, which may not reflect native expression levels.
• Introducing a chromosomal copy of a gene is desirable for achieving native expression levels for complementation studies.

Purpose of the Study:

• To present a simple and efficient methodology for chromosomal gene tagging using λ-Red recombineering.
• To develop tools for chromosomal modification at a conserved locus downstream of the glmS gene.
• To enable the creation of a library of insertion mutants for gene function studies.

Main Methods:

• Utilized λ-Red-based 'gene doctoring' for homologous recombination-mediated genome engineering.
• Developed and applied tools for chromosomal tagging in a conserved locus downstream of glmS.
• Assessed the impact of chromosomal modifications on various bacterial phenotypes.

Main Results:

• Successfully developed a simple methodology for chromosomal tagging using λ-Red recombineering.
• Demonstrated that chromosomal modifications at the glmS locus did not negatively affect important phenotypes.
• Established an easy, quick, and inexpensive method for creating bacterial insertion mutants.

Conclusions:

• The presented methodology offers an accessible approach for chromosomal modification in bacteria.
• This technique facilitates the generation of mutant libraries for comprehensive gene function analysis.
• The developed tools are valuable for researchers studying bacterial genetics and molecular biology.