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Gene replacement in mycobacteria by using incompatible plasmids.

Carey A Pashley1, Tanya Parish, Ruth A McAdam

  • 1Department of Infectious & Tropical Diseases, London School of Hygiene & Tropical Medicine, London WC1E 7HT, United Kingdom.

Applied and Environmental Microbiology
|January 7, 2003
PubMed
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A new plasmid system enables targeted gene knockouts in Mycobacterium smegmatis by exploiting plasmid incompatibility. This method efficiently generates mutants for studying gene function in mycobacteria.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Targeted gene knockouts are crucial for understanding gene function in mycobacteria.
  • Existing methods for gene manipulation in Mycobacterium species can be inefficient or complex.

Purpose of the Study:

  • To develop a simple and efficient delivery system for targeted gene knockouts in Mycobacterium smegmatis.
  • To leverage plasmid incompatibility for generating gene mutants.

Main Methods:

  • Utilized a pair of incompatible replicating plasmids based on pAL5000 for gene mutagenesis.
  • Introduced plasmids carrying a mutated allele of the target gene, allowing homologous recombination.
  • Manipulated replication genes (repA, repB) and incompatibility regions to optimize plasmid loss in the absence of antibiotic selection.

Related Experiment Videos

  • Constructed flexible gene cassettes for easy addition of selection and screening genes.

    • Main Results:

    • Demonstrated efficient loss of both incompatible plasmids in Mycobacterium smegmatis and Mycobacterium bovis BCG when they complemented each other's replication genes.
    • Showed that incorporating an additional incompatibility region increased the rate of plasmid loss.
    • Successfully isolated Mycobacterium smegmatis pyrF mutants at high frequency using the developed system.

    Conclusions:

    • The developed plasmid incompatibility system provides a simple and efficient method for targeted gene knockouts in M. smegmatis.
    • This approach is potentially applicable to other Mycobacterium species, including Mycobacterium tuberculosis.
    • The system facilitates mutant generation for studying gene function and phenotypic effects.