Abstract
Grouper aquaculture industries have a high risk of being inflicted by bacterial diseases such as vibriosis. Various types of vaccines for vibriosis have been studied throughout the years, yet the potential of live attenuated vaccines remains unsubstantial. Correspondingly, this study attempts to develop a Vibrio harveyi protease deletion mutant into a live attenuated vaccine candidate against vibriosis for Epinephelus fuscoguttatus. Site-directed mutagenesis (SDM) and allelic exchange replacement techniques are employed to synthesize genetically attenuated V. harveyi strain MVh-vhs. The evaluation on safety levels showed that MVh-vhs strain is safe when tested on E. fuscoguttatus. A 100% survival rate with no sign of vibriosis is indicated in fish challenged with the attenuated strain. In contrast, fish challenged with the parental strain showed obvious clinical signs of vibriosis. The median lethal dosage (LD50) of fish challenged with the parental strain is found at 106 CFU/fish. A single dose IP administration of the attenuated strain at 105 CFU/fish following a bacterial challenge at dose 108 CFU/fish is done 4 weeks post vaccination. The vaccinated fish show 52% relative percentage survival (RPS). The transcriptomic profiling following vaccination evoked the regulation of autophagosome pathway and the coagulation and complement cascade pathways as well as antigen processing and presentation pathways. As a conclusion, the V. harveyi attenuated strain MVh-vhs has significant potential to be applied as a live vaccine candidate against vibriosis for E. fuscoguttatus.
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Acknowledgements
The author would like to thank the Malaysian government (under SLAB-SLAI program) for supporting PhD study and Fisheries Society for awarding the AFS-Kanazawa Research Fellowship Grant to Aslizah Mohd Aris.
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This work was also supported by the grants provided by Ministry of Higher Institution via Higher Institution Centre of Excellence (HICoE) under vote no: 6369100 and Universiti Putra Malaysia Grant GP-IPB under vote number GP-IPB 9484102.
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All procedures performed in studies involving animals were in accordance with the ethical standards of the Institutional Animal Care and Use Committee (IACUC), Universiti Putra Malaysia (UPM) under approval number UPM/IACUC/AUP/R059/2016.
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Mohd-Aris, A., Saad, MZ., Daud, H.M. et al. Vibrio harveyi protease deletion mutant as a live attenuated vaccine candidate against vibriosis and transcriptome profiling following vaccination for Epinephelus fuscoguttatus. Aquacult Int 27, 125–140 (2019). https://doi.org/10.1007/s10499-018-0311-x
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DOI: https://doi.org/10.1007/s10499-018-0311-x