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Tn10 insertional mutagenesis in Pasteurella multocida

M D Lee1, A D Henk

  • 1Department of Medical Microbiology, College of Veterinary Medicine, University of Georgia, Athens 30602, USA. lee.m@calc.vet.uga.edu

Veterinary Microbiology
|May 1, 1996
PubMed
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Researchers identified Tn10 as a transposon for stable, random genomic integration in Pasteurella multocida. This method efficiently generates mutants for studying bacterial virulence factors.

Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Pasteurella multocida is a significant bacterial pathogen.
  • Efficient genetic tools are needed for Pasteurella multocida research.
  • Understanding virulence determinants requires stable genetic mutants.

Purpose of the Study:

  • To identify a transposon for stable and random genomic integration in Pasteurella multocida.
  • To establish a reliable method for generating insertional mutations in this species.

Main Methods:

  • Utilized a suicide conjugative delivery system (pLOF) with a kanamycin resistance-marked Tn10 element.
  • Performed conjugation and transposition experiments.
  • Assessed insertion stability via DNA/DNA hybridization after serial subcultures without antibiotic selection.

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Main Results:

  • Tn10 demonstrated effectiveness in generating insertional mutations in Pasteurella multocida.
  • Combined conjugation/transposition events occurred at a frequency of 1 in 10,000 donor cells.
  • Genomic insertions were random and stable, with only 1.4% vector integration.
  • Twenty-two percent of isolates became auxotrophic, including 4% tryptophan auxotrophs.

Conclusions:

  • The Tn10 transposon system provides a robust method for stable, random mutagenesis in Pasteurella multocida.
  • Generated mutants are valuable for investigating bacterial virulence mechanisms.
  • This genetic tool advances research into Pasteurella multocida pathogenesis.