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Related Experiment Videos

Site-specific recombination-based genetic system for reporting transient or low-level gene expression.

N Carol Casavant1, Gwyn A Beattie, Gregory J Phillips

  • 1Department of Agronomy, Iowa State University, Ames, IA 50011, USA.

Applied and Environmental Microbiology
|June 29, 2002
PubMed
Summary

Researchers developed a novel genetic system for bacteria that irreversibly reports target gene expression. This system uses bacteriophage P22 recombination to activate reporter gene expression, enabling detection of molecules like arabinose in environments.

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Area of Science:

  • Synthetic Biology
  • Microbial Genetics
  • Environmental Microbiology

Background:

  • Monitoring gene expression in bacteria is crucial for understanding microbial behavior.
  • Existing reporter systems often lack heritability or irreversibility, limiting long-term tracking.
  • Detecting specific molecules in complex environments like the rhizosphere requires sensitive biosensors.

Purpose of the Study:

  • To construct and characterize a plasmid-based genetic system for irreversible, heritable reporting of bacterial gene expression.
  • To apply this system as a biosensor for detecting bioavailable arabinose in bacterial populations and plant environments.
  • To demonstrate the system's utility in tracking molecular signals in the barley rhizosphere.

Main Methods:

  • Development of a reporter plasmid (pAraLHB) utilizing bacteriophage P22 site-specific recombination machinery.

Related Experiment Videos

  • Engineering of the system for strong repression of the gfp reporter gene in the absence of target promoter induction.
  • Application of the engineered Enterobacter cloacae JL1157(pAraLHB) biosensor in culture, hydroponics, and soil microcosms.

    • Main Results:

    • The genetic system achieved irreversible expression of the gfp reporter gene upon target promoter induction, with nearly 100% population response in culture.
    • The biosensor successfully detected bioavailable arabinose released from germinating legume and grass seeds.
    • Localization of arabinose was achieved along barley roots, specifically near the root-seed junction and on seminal roots, but not at root tips.

    Conclusions:

    • The developed recombination-based reporter system provides a robust method for irreversible, heritable reporting of gene expression in bacteria.
    • This biosensor effectively monitors the availability of specific molecules, such as arabinose, in both laboratory and environmental settings.
    • The system offers a valuable tool for studying bacterial interactions and environmental signaling in situ.