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Updated: Jan 29, 2026

A Rapid Image-based Bacterial Virulence Assay Using Amoeba
Published on: June 27, 2018
Phenotypic characterization, virulence, and immunogenicity of Pseudomonas plecoglossicida rpoE knock-down strain
Lixing Huang1, Youyu Zhang2, Rongchao He1
1Fisheries College, Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Jimei University, Xiamen, Fujian, PR China.
Abstract:
Pseudomonas plecoglossicida, a temperature dependent bacterial pathogen in fish, expresses rpoE gene that is sensitive to temperature and probably critical for pathogen virulence and disease development. In this study, the rpoE silence strain rpoE-RNAi-1 was constructed by gene knock-down. The rpoE-RNAi-1 displayed significant changes in biofilm formation, swarming motility, adhesion and virulence. Meanwhile, vaccination of grouper with rpoE-RNAi-1 led to a relative percent survival (RPS) value of 85% after challenged with the wild-type P. plecoglossicida. qRT-PCR assays showed that vaccination with rpoE-RNAi-1 enhanced the expression of immune-related genes, including MHC-I, MHC-II, IgM, and IL-1β, indicating that it was able to induce humoral and cell-mediated immune response in grouper. These results validated the possibility of rpoE as a potential target for constructing P. plecoglossicida live attenuated vaccine.
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