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Infection and immunity v.85 no.2, 2017년, pp.e00654-16 - e00654-16   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Systematic Analysis of Two-Component Systems in Citrobacter rodentium Reveals Positive and Negative Roles in Virulence

Thomassin, Jenny-Lee (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada ); Leclerc, Jean-Mathieu (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada ); Giannakopoulou, Natalia (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada ); Zhu, Lei (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada ); Salmon, Kristiana (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada ); Portt, Andrea (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada ); Daigle, France (Dééépartement de Microbiologie, Infectiologie et Immunologie, Universitéééé ); Le Moual, Hervé (de Montréééééal, Montrééééééal, QC, Canada ); Gruenheid, Samantha (Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada );
  • 초록  

    Citrobacter rodentium is a murine pathogen used to model intestinal infections caused by the human diarrheal pathogens enterohemorrhagic and enteropathogenic Escherichia coli . During infection, bacteria use two-component systems (TCSs) to detect changing environmental cues within the host, allowing for rapid adaptation by altering the expression of specific genes. In this study, 26 TCSs were identified in C. rodentium , and quantitative PCR (qPCR) analysis showed that they are all expressed during murine infection. These TCSs were individually deleted, and the in vitro and in vivo effects were analyzed to determine the functional consequences. In vitro analyses only revealed minor differences, and surprisingly, type III secretion (T3S) was only affected in the Δ arcA strain. Murine infections identified 7 mutants with either attenuated or increased virulence. In agreement with the in vitro T3S assay, the Δ arcA strain was attenuated and defective in colonization and cell adherence. The Δ rcsB strain was among the most highly attenuated strains. The decrease in virulence of this strain may be associated with changes to the cell surface, as Congo red binding was altered, and qPCR revealed that expression of the wcaA gene, which has been implicated in colanic acid production in other bacteria, was drastically downregulated. The Δ uvrY strain exhibited increased virulence compared to the wild type, which was associated with a significant increase in bacterial burden within the mesenteric lymph nodes. The systematic analysis of virulence-associated TCSs and investigation of their functions during infection may open new avenues for drug development.


  • 주제어

    Citrobacter .   attaching/effacing pathogens .   bacterial pathogenesis .   gastrointestinal infection .   host-pathogen interactions .   mouse models .   two-component regulatory systems.  

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