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杀鲑气单胞菌中质粒介导的土霉素抗性的分子特征分析

Molecular characterization of plasmid-mediated oxytetracycline resistance in Aeromonas salmonicida.

作者信息

Adams C A, Austin B, Meaden P G, McIntosh D

机构信息

Department of Biological Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, Scotland.

出版信息

Appl Environ Microbiol. 1998 Nov;64(11):4194-201. doi: 10.1128/AEM.64.11.4194-4201.1998.

DOI:10.1128/AEM.64.11.4194-4201.1998
PMID:9797265
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC106627/
Abstract

Using broth conjugation, we found that 19 of 29 (66%) oxytetracycline (OT)-resistant isolates of Aeromonas salmonicida transferred the OT resistance phenotype to Escherichia coli. The OT resistance phenotype was encoded by high-molecular-weight R-plasmids that were capable of transferring OT resistance to both environmental and clinical isolates of Aeromonas spp. The molecular basis for antibiotic resistance in OT-resistant isolates of A. salmonicida was determined. The OT resistance determinant from one plasmid (pASOT) of A. salmonicida was cloned and used in Southern blotting and hybridization experiments as a probe. The determinant was identified on a 5.4-kb EcoRI fragment on R-plasmids from the 19 OT-resistant isolates of A. salmonicida. Hybridization with plasmids encoding the five classes (classes A to E) of OT resistance determinants demonstrated that the OT resistance plasmids of the 19 A. salmonicida isolates carried the class A resistance determinant. Analysis of data generated from restriction enzyme digests showed that the OT resistance plasmids were not identical; three profiles were characterized, two of which showed a high degree of homology.

摘要

通过肉汤接合试验，我们发现29株鲑鱼气单胞菌中19株（66%）对土霉素（OT）耐药的菌株将OT耐药表型转移至大肠杆菌。OT耐药表型由高分子量R质粒编码，该质粒能够将OT耐药性转移至气单胞菌属的环境分离株和临床分离株。确定了鲑鱼气单胞菌OT耐药分离株中抗生素耐药性的分子基础。从鲑鱼气单胞菌的一个质粒（pASOT）中克隆了OT耐药决定簇，并将其用作Southern印迹和杂交实验的探针。在来自19株鲑鱼气单胞菌OT耐药分离株的R质粒上，在一个5.4 kb的EcoRI片段上鉴定出该决定簇。与编码OT耐药决定簇五类（A至E类）的质粒杂交表明，19株鲑鱼气单胞菌分离株的OT耐药质粒携带A类耐药决定簇。对限制性内切酶消化产生的数据进行分析表明，OT耐药质粒并不相同；鉴定出三种图谱，其中两种显示出高度同源性。