Identification of putative virulence-associated genes among Haemophilus parasuis strains and the virulence difference of different serovars

文献类型： 外文期刊

第一作者： Yu, Jiang

作者： Yu, Jiang;Wu, Jiaqiang;Zhang, Yuyu;Du, Yijun;Peng, Jun;Chen, Lei;Sun, Wenbo;Cong, Xiaoyan;Xu, Shaojian;Shi, Jianli;Li, Jun;Huang, Baohua;Zhu, Xiwang;Wang, Jinbao;Yu, Jiang;Wu, Jiaqiang;Zhang, Yuyu;Du, Yijun;Peng, Jun;Chen, Lei;Sun, Wenbo;Cong, Xiaoyan;Xu, Shaojian;Shi, Jianli;Li, Jun;Huang, Baohua;Zhu, Xiwang;Wang, Jinbao;Wang, Jinbao

作者机构：

关键词： Haemophilus parasuis;Serovars;Virulence evaluation;Virulence genes

期刊名称：MICROBIAL PATHOGENESIS （ 影响因子：3.738； 五年影响因子：3.663 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： This study was aimed at determining virulence-associated genes among Haemophilus parasuis (H. parasuis) strains, and supplying for the Kielstein Rapp Gabrielson serotyping scheme. The subtractive fragments, obtained through suppression subtractive hybridization and reverse Southern blot hybridization, were found to encode genes representative of 7 different functions. PCR was used to investigate the distribution of these fragments in H. parasuis strains isolated from different infection sites in pigs. Mice challenge was then used to analyze the correlationship between subtractive fragments, infection sites and bacterial virulence. Eight weeks old female BALB/c mice (10 mice/group) were inoculated intraperitoneally with 3.0 x 10(9) CFU suspension (0.5 ml/mouse) of H. parasuis strains in PBS. Results indicated that H. parasuis possessed varied virulence even among the same serovar strains. Transcription units hsdR, hsdS, gpT and ompP2, identified from the subtractive fragments, were uniformly expressed in highly virulent strains, while absent in weakly virulent strains, and demonstrated variable degrees of expression in moderately virulent strains. Moreover, H. parasuis strains, isolated from pericardium and heart blood, were all highly virulent strains, while from nasal cavity and joint were moderately or weakly virulent strains. This study indicated that fragments hsdR, hsdS, gpT and ompP2 were associated with the virulence of H. parasuis. The virulence of H. parasuis strains isolated from different infection sites was different. The current research provides a new reference for determining bacterial virulence in different H. parasuis strains. (C) 2014 Elsevier Ltd. All rights reserved.

分类号： R3

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