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pubmed-article:21788384pubmed:abstractTextAlthough toxins A and B are known to be important contributors to the acute phase of Clostridium difficile infection, the role of colonization and adherence to host tissues in the overall pathogenesis of these organisms remains unclear. Consequently, we used the recently introduced intron-based ClosTron gene interruption system to eliminate the expression of two reported C. difficile colonization factors, the major flagellar structural subunit (FliC) and the flagellar cap protein (FliD), to gain greater insight into how flagella and motility contribute to C. difficile's pathogenic strategy. The results demonstrate that interrupting either the fliC or the fliD gene results in a complete loss of flagella, as well as motility, in C. difficile. However, both the fliC and fliD mutant strains adhered better than the wild-type 630?erm strain to human intestine-derived Caco-2 cells, suggesting that flagella and motility do not contribute to, or may even interfere with, C. difficile adherence to epithelial cell surfaces in vitro. Moreover, we found that the mutant strains were more virulent in hamsters, indicating either that flagella are unnecessary for virulence or that repression of motility may be a pathogenic strategy employed by C. difficile in hamsters.lld:pubmed
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pubmed-article:21788384pubmed:articleTitleMutagenic analysis of the Clostridium difficile flagellar proteins, FliC and FliD, and their contribution to virulence in hamsters.lld:pubmed
pubmed-article:21788384pubmed:affiliationDepartment of Microbiology, Faculty of Medicine, University of Calgary, Calgary, AB, Canada.lld:pubmed
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