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Int. J. Mol. Sci. 2016, 17(4), 557; doi:10.3390/ijms17040557

Genome Sequence of the Fish Pathogen Yersinia ruckeri SC09 Provides Insights into Niche Adaptation and Pathogenic Mechanism

1,2,†,* , 1,†
Department of Basic Veterinary, Veterinary Medicine College, Sichuan Agricultural University, 211 Huimin Road, Chengdu 611134, Sichuan, China
Key Laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Chengdu 611134, Sichuan, China
Department of Aquaculture, College of Animal Science & Technology, Sichuan Agricultural University, Chengdu 611134, Sichuan, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editors: Jun Li and Li Lin
Received: 23 January 2016 / Revised: 26 March 2016 / Accepted: 5 April 2016 / Published: 14 April 2016
(This article belongs to the Special Issue Fish Molecular Biology)
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Yersinia ruckeri is the etiologic agent of enteric red mouth disease (ERM), a severe fish disease prevailing in worldwide aquaculture industries. Here we report for the first time the complete genome of Y. ruckeri (Yersinia ruckeri) SC09, a highly virulent strain isolated from Ictalurus punctatus with severe septicemia. SC09 possesses a single chromosome of 3,923,491 base pairs, which contains 3651 predicted protein coding sequences (CDS), 19 rRNA genes, and 79 tRNA genes. Among the CDS, we have identified a Ysa locus containing genes encoding all the components of a type III secretion system (T3SS). Comparative analysis suggest that SC09-Ysa share extensive similarity in sequence, gene content, and gene arrangement with Salmonella enterica pathogenicity island 1 (SPI1) and chromosome-encoded T3SS from Yersinia enterocolitica biotype 1B. Furthermore, phylogenetic analysis shown that SC09-Ysa and SPI1-T3SS belong on the same branch of the phylogenetic tree. These results suggest that SC09-Ysa and SPI1-T3SS appear to mediate biological function to adapt to specific hosts with a similar niche, and both of them are likely to facilitate the development of an intracellular niche. In addition, our analysis also indicated that a substantial part of the SC09 genome might contribute to adaption in the intestinal microenvironment, including a number of proteins associated with aerobic or anaerobic respiration, signal transduction, and various stress reactions. Genomic analysis of the bacterium offered insights into the pathogenic mechanism associated with intracellular infection and intestinal survivability, which constitutes an important first step in understanding the pathogenesis of Y. ruckeri. View Full-Text
Keywords: Yersinia ruckeri; whole-genome sequencing; type III secretion system; niche adaptation; pathogenicity Yersinia ruckeri; whole-genome sequencing; type III secretion system; niche adaptation; pathogenicity

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Liu, T.; Wang, K.-Y.; Wang, J.; Chen, D.-F.; Huang, X.-L.; Ouyang, P.; Geng, Y.; He, Y.; Zhou, Y.; Min, J. Genome Sequence of the Fish Pathogen Yersinia ruckeri SC09 Provides Insights into Niche Adaptation and Pathogenic Mechanism. Int. J. Mol. Sci. 2016, 17, 557.

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