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Screening and identification of Shigella flexneri 2a virulence-related genes induced after invasion of epithelial cells

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Science China(Life Sciences) 2004年第6期47卷 494-502页

作者： SHI Zhaoxing WANG Hengliang HU Kun FENG Erling YAO Xiao HUANG Liuyu SU Guofu hunag peitang HUANG Cuifen Beijing Institute of Biotechnology Beijing 100071China Beijing Institute of BiotechnologyBeijing 100071China Beijing Institute of BiotechnologyBeijing 100071China College of Life Science Shandong Normal UniversityJinan 250014China Beijing Institute of BiotechnologyBeijing 100071China Beijing Institute of BiotechnologyBeijing 100071China College of Environmental and Chemical Engineering Xi'an Jiaotong UniversityXi'an 710049China Beijing Institute of BiotechnologyBeijing 100071China Beijing Institute of BiotechnologyBeijing 100071China Beijing Institute of BiotechnologyBeijing 100071China Beijing Institute of BiotechnologyBeijing 100071China

An in vivo expression technology (IVET) was applied to screen *** 2a genes induced after invasion of epithelial cells, and virulence-related genes were further identified by mutational analysis. Thirteen intracellular induced genes were identified with a HeLa cell infection model. Of these, two were identified as alkylation-related genes; one was related to metabolism; one encoded a transcriptional regulator; three were identified as insertion elements; three ap- peared to be antisense to genes involved in the transmethylation,biosyntheseis, and phos- photransferase system;and three were predicted to encode polypeptides with unknown functions. Intracellular survival assavs showed that the mutants of alkA,citC and wcaJ genes had lower capability of intracellular replication or survival than the the wild-type *** results indicated that alkA, citC and wcaJ genes could take part in the intracellular survival or replication of S. flexneri 2a and the capability of intracellular survival or replication could be one of the major virulence elements. However, the yaiC mutant was able to survive in the murine infection assay but almost not in HeLa cell infection assay. Very possibly, yaiC gene was involved in the other mechanism of S. flexneri virulence. This study might lead to a better understanding of the intra- cellular survival or proliferation process of S. flexneri 2a and perhaps provide insights into the pathogenicity of this pathogen.

关键词： Shigella flexneri 2a intracellular induced expression virulence-related genes in vivo expression technology.

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