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A two-component signal transduction system contributes to the virulence of Riemerella anatipestifer
Qing Wang, Mianmian Chen, Wei Zhang*
Key Lab of Animal Bacteriology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Correspondence to: Tel: +86-84395328; Fax: +86 84395328; E-mail: vszw@njau.edu.cn
Received: July 11, 2017; Revised: October 25, 2017; Accepted: November 24, 2017; Published online: December 28, 2017.
Abstract
Similar to other bacterial pathogens, current studies of the pathogenesis of Riemerella anatipestifer (RA) are focused mainly on in vitro culture conditions. To provide a further understanding of the pathogenesis of RA in vivo, bacterial RNA was extracted from overnight tryptic soy broth cultures (in vitro) and from the blood of infected ducks (in vivo) for comparative RNA-seq analysis. In total, 682 upregulated genes were identified in vivo. Among these upregulated genes, a signal transduction response regulator (ArsR) and a signal transduction histidine kinase (SthK) were predicted located on the same operon. Mutant was constructed by deletion of both of these genes. Duck infection tests showed that genes ArsR and SthK were related to the virulence of the pathogen in vivo. Differentially expressed genes identified by comparison of in vitro and in vivo conditions provided an insight into the physiological process of RA infection and an opportunity to identify more virulence factors.
Keywords: Riemerella anatipestifer; comparative RNA-seq; virulence factors; pathogenesis


© 2017 The Korean Society of Veterinary Science.