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Diseases of Aquatic Organisms

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DAO 119:59-66 (2016)  -  DOI:

Detection of putative virulence genes of Lactococcus garvieae

Mustafa Ture1, Ilhan Altinok2,*

1Fish Health Department, Central Fisheries Research Institute, 61250 Yomra, Trabzon, Turkey
2Department of Fisheries Technology Engineering, Faculty of Marine Science, Karadeniz Technical University, 61530 Surmene, Trabzon, Turkey
*Corresponding author:

ABSTRACT: Lactococcus garvieae is the causative agent of lactococcosis and has been isolated from a wide variety of animals. In the present study, 34 strains of L. garvieae isolated from fish from different sources and locations were tested for the presence or absence of the following putative virulence genes: a capsule gene cluster (CGC), hemolysins 1, 2, and 3 (hly1, -2, -3), NADH oxidase, superoxide dismutase (sod), phosphoglucomutase ( pgm), adhesin Pav (adhPav), adhesin PsaA (adhPsaA), enolase (eno), LPxTG-containing surface proteins 1, 2, 3, and 4 (LPxTG-1, LPxTG-2, LPxTG-3, LPxTG-4; where LPxTG means Leu-Pro-any-Thr-Gly), adhesin clusters 1 and 2 (adhCI, adhCII), and adhesin (adh). To determine the presence of the CGC, we developed a multiplex PCR. All strains of L. garvieae had the hly1, -2, -3, NADH oxidase, pgm, adhPav, LPxTG-2, LPxTG-3, sod, eno, adhPsaA, adhCII, and adhCII genes, while only the Lg2 strain contained the CGC. The virulent Lg2 strain contained all 17 virulent genes. All Turkish, Spanish, Italian, and French strains did not contain the CGC. The multiplex PCR assay was useful for the detection of the CGC genes. In conclusion, the CGC is not the only virulent factor in L. garvieae because strains that lack the CGC are virulent to rainbow trout. Single genes also might not be responsible for the virulence of L. garvieae.

KEY WORDS: Capsule gene cluster · Hemolysin · LPxTG-containing surface protein · Enolase

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Cite this article as: Ture M, Altinok I (2016) Detection of putative virulence genes of Lactococcus garvieae. Dis Aquat Org 119:59-66.

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