DAO 111:31-39 (2014)  -  DOI: https://doi.org/10.3354/dao02763

Type III secretion system genes of Edwardsiella tarda associated with intracellular replication and virulence in zebrafish

Jun Okuda1,2,*, Yusuke Takeuchi1, Toshihiro Nakai

1Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima 739-8528, Japan
2Department of Microbiology, Kagawa Prefectural University of Health Sciences, 281-1 Hara, Mure-cho, Takamatsu, Kagawa 761-0123, Japan
*Corresponding author:

ABSTRACT: The Type III secretion system (T3SS) is essential for intracellular replication of Edwardsiella tarda in phagocytes of fish and mammals. Two possible effector candidate genes (eseE and eseG) and 7 hypothetical genes (esaB, escC, orf13, orf19, orf26, orf29, and orf30) located in the T3SS gene cluster were inactivated by an allelic exchange method, and we found that E. tarda strains carrying insertion mutations in escC, orf13, orf19, orf29, and orf30 were unable to replicate within J774 macrophages and HEp-2 epithelial cells. Furthermore, the virulence of these mutants to zebrafish was severely attenuated as well. These data suggest that the escC, orf13, orf19, orf29, and orf30 genes are required for intracellular replication and virulence of E. tarda.


KEY WORDS: E. tarda T3SS genes · Intracellular replication · Virulence · Danio rerio


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Cite this article as: Okuda J, Takeuchi Y, Nakai T (2014) Type III secretion system genes of Edwardsiella tarda associated with intracellular replication and virulence in zebrafish. Dis Aquat Org 111:31-39. https://doi.org/10.3354/dao02763

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