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Related Experiment Videos

Maintenance and killing efficiency of conditional lethal constructs in Pseudomonas putida.

A K Bej1, S Molin, M Perlin

  • 1Department of Biology, University of Louisville, Kentucky 40292.

Journal of Industrial Microbiology
|August 1, 1992
PubMed
Summary

Engineered Pseudomonas putida strains with conditional lethal constructs show promise for microbial containment. These suicide gene systems effectively reduce viable cell counts upon induction, aiding environmental release safety.

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Area of Science:

  • Microbiology
  • Genetic Engineering
  • Biotechnology

Background:

  • Genetically engineered microbes (GEMs) require robust containment strategies for safe environmental release.
  • Conditional lethal (suicidal) genetic systems offer a potential mechanism for controlling GEM populations.

Purpose of the Study:

  • To design and evaluate conditional lethal constructs in Pseudomonas putida strains for microbial containment.
  • To assess the efficacy of host killing genes (hok and gef) in reducing viable cell counts.

Main Methods:

  • Construction of suicide vectors (pBAP24h) containing the hok gene under the tac promoter.
  • Insertion of the gef gene (chromosomal homolog of hok) into the P. putida chromosome using a transposon.
  • Induction of gene expression and monitoring of cell viability and genetic sequence retention.

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Main Results:

  • Induction of the hok gene in P. putida resulted in only 40% of surviving cells retaining the gene within 4 hours.
  • Conditional lethal strains exhibited resistance to hok-induced killing, possibly due to mutations or physiological adaptations.
  • Both chromosomal and plasmid gef constructs effectively reduced viable cell counts by 10^3-10^5-fold within 2 hours post-induction.

Conclusions:

  • Conditional lethal constructs, utilizing hok and gef genes, are effective in reducing viable Pseudomonas putida populations.
  • The developed systems demonstrate potential for containment of genetically engineered microbes intended for environmental release.
  • Further research into resistance mechanisms is warranted for optimizing the stability and efficacy of these containment strategies.