Discovery and characterization of gene cassettes-containing integrons in clinical strains of Riemerella anatipestifer

文献类型： 外文期刊

第一作者： Zheng, Fuying

作者： Zheng, Fuying;Lin, Guozhen;Zhou, Jizhang;Cao, Xiaoan;Gong, Xiaowei;Wang, Guanghua;Qiu, Changqing

作者机构：

关键词： Gene cassettes;Integron;Riemerella anatipestifer

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）

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收录情况： SCI

摘要： Forty-eight prevalent strains of Riemerella anatipestifer (RA) isolated in China were tested for susceptibility to eighteen antibiotics and investigated for the frequencies and characteristics of integrons and gene cassettes. All isolates were resistant to between three and ten antimicrobial drugs. Forty-seven isolates contained class 1 integron (97.92%), and 15 of the 47 isolates contained class 2 integron (31.25%). Class 3 integron was not detected in the strains analysed. Three different cassette arrays (aadA1, aadA5 and aacA4-aadA1) of class 1 integron and one gene cassette (sat2-aadA1) of class 2 integron were discovered. Three out of the four cassette arrays were novel, with the exception of aadA5. The location of integrons was confirmed by transforming extracted plasmids into an integron-negative strain of Escherichia coli (E. coli) BL21 (DE3). Class 1 integrons were always discovered in plasmids, while class 2 integrons could be located on plasmids or in the chromosome. This is the first description of class 2 integrons, three novel cassette arrays and the location of integrons in RA species. (c) 2011 Elsevier B.V

分类号： S8

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