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- W2125161330 abstract "ABSTRACT The facultative intracellular bacterium Francisella tularensis causes the zoonotic disease tularemia. F. tularensis resides within host macrophages in vivo, and this ability is essential for pathogenesis. The transcription factor MglA is required for the expression of several Francisella genes that are necessary for replication in macrophages and for virulence in mice. We hypothesized that the identification of MglA-regulated genes in the Francisella genome by transcriptional profiling of wild-type and mglA mutant bacteria would lead to the discovery of new virulence factors utilized by F. tularensis . A total of 102 MglA-regulated genes were identified, the majority of which were positively regulated, including all of the Francisella pathogenicity island (FPI) genes. We mutated novel MglA-regulated genes and tested the mutants for their ability to replicate and induce cytotoxicity in macrophages and to grow in mice. Mutations in MglA-regulated genes within the FPI ( pdpB and cds2 ) as well as outside the FPI (FTT0989, oppB , and FTT1209c) were either attenuated or hypervirulent in macrophages compared to the wild-type strain. All of these mutants exhibited decreased fitness in vivo in competition experiments with wild-type bacteria. We have identified five new Francisella virulence genes, and our results suggest that characterizations of additional MglA-regulated genes will yield further insights into the pathogenesis of this bacterium." @default.
- W2125161330 created "2016-06-24" @default.
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- W2125161330 date "2006-12-01" @default.
- W2125161330 modified "2023-10-12" @default.
- W2125161330 title "Identification of MglA-Regulated Genes Reveals Novel Virulence Factors in <i>Francisella tularensis</i>" @default.
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- W2125161330 doi "https://doi.org/10.1128/iai.01250-06" @default.
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