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Related Experiment Videos

[Transpon Tn5 mutagenesis in Citrobacter].

A Q Wang1, P Yin, X Z Chen

  • 1Institute of Microbiology, Academia Sinica, Beijing.

Wei Sheng Wu Xue Bao = Acta Microbiologica Sinica
|April 1, 1990
PubMed
Summary

Transposon Tn5, initially on plasmid PJB4JI in E. coli, caused mutations in Citrobacter strain C-3-1. This genetic analysis identified auxotrophic mutants resulting from Tn5 transposition into the C-3-1 chromosome.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Bacterial conjugation is a key mechanism for horizontal gene transfer.
  • Transposable elements like Tn5 can mediate genetic rearrangements and mutations.

Purpose of the Study:

  • To investigate the genetic basis of auxotrophy in Citrobacter strain C-3-1 following conjugation with E. coli.
  • To determine the role of Tn5 in inducing mutations during bacterial mating.

Main Methods:

  • Bacterial conjugation experiments using E. coli 1830/PJB4JI and Citrobacter strains.
  • Isolation and characterization of kanamycin-resistant (Kanr) transconjugants.
  • Auxotroph screening and genetic analysis of mutant strains.
  • Plasmid and chromosomal DNA hybridization with labeled Tn5 DNA.

Main Results:

  • High frequency of Kanr transconjugants obtained from mating with Citrobacter C-3-1.
  • Identification of 21 auxotrophic mutants among 3000 Kanr transconjugants.
  • Absence of PJB4JI plasmid DNA in auxotrophic strains, indicating Tn5-induced mutations.
  • Positive hybridization signals between auxotroph chromosomal DNA and labeled Tn5 DNA, confirming Tn5 integration.

Conclusions:

  • Auxotrophic mutations in Citrobacter C-3-1 were caused by the transposition of Tn5 from the E. coli PJB4JI plasmid.
  • Genetic and physical data support Tn5 transposition as the mechanism for auxotrophy induction.

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