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Construction, detection and microarray analysis on the Shigella flexneri 2a sitC mutant.

Moqing Liu1, Hongt Liu, Lilian Sun

  • 1State Key Laboratory for Molecular Virology and Genetic Engineering, Beijing 100176, China.

Science in China. Series C, Life Sciences
|August 12, 2005
PubMed
Summary
This summary is machine-generated.

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The Sit iron-transport system is crucial for Shigella growth. Disrupting the sitC gene in Shigella flexneri 2a reduced growth under iron deficiency and altered gene expression, confirming the system

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Low-copy suicide plasmid pCVD442 presents challenges for gene operations.
  • The sitC gene is involved in iron transport in Shigella flexneri 2a.
  • Understanding iron transport is critical for bacterial pathogenesis.

Purpose of the Study:

  • To develop an improved gene knockout system using Gateway technology for low-copy plasmids.
  • To investigate the role of the sitC gene in Shigella flexneri 2a.
  • To characterize the impact of sitC inactivation on bacterial growth, virulence, and gene expression.

Main Methods:

  • Construction of a recombinant plasmid for gene knockout using Gateway technology.
  • Generation of a sitC mutant (MTS) in Shigella flexneri 2a strain 301.

Related Experiment Videos

  • Functional analysis including growth assays, cell culture experiments, animal models, and DNA microarray analysis under iron-restricted conditions.

    • Main Results:

    • The MTS mutant exhibited significantly reduced growth in iron-deficient medium compared to the wild-type strain.
    • Iron or manganese supplementation restored MTS growth to wild-type levels.
    • MTS showed no significant changes in overall virulence in cell lines and a guinea pig keratoconjunctivitis model, but intracellular multiplication was reduced under iron limitation.
    • DNA microarray analysis revealed altered gene expression profiles in MTS, with increased sensitivity to iron deficiency and higher upregulation of membrane transport and metabolism genes.
    • Expression of known iron-transport genes was generally increased under low iron, with a greater magnitude in MTS.

    Conclusions:

    • The Sit iron-transport system is essential for Shigella growth.
    • Inactivation of sitC impacts bacterial response to iron availability and alters global gene expression.
    • Gateway technology provides an effective tool for constructing knockout plasmids in low-copy systems.