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Viral Metagenomics: A Tool for Virus Discovery and Diversity in Aquaculture

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Abstract

Viruses are abundant biological entities on earth and the emergence of viral pathogens has become a serious threat to aquaculture and fisheries worldwide. However, our response to viral pathogens has been largely reactive, in the sense that a new pathogen is usually not discovered until it has already reached epidemic proportions. Current diagnostic methods such as PCR, immunological assays and pan-viral microarrays are limited in their ability to identify novel viruses. In this context, the knowledge on the diversity of viruses in healthy and disease situations becomes important for understanding their role on the health of animals in aquaculture species. Viral metagenomics, which involves viral purification and shotgun sequencing, has proven to be useful for understanding viral diversity and describing novel viruses in new diseases and has been recognized as an important tool for discovering novel viruses in human and veterinary medicine. With the advancements in sequencing technology and development of bioinformatics tools for nucleic acid sequence assembly and annotation, information on novel viruses and diversity of viruses in marine ecosystems has been rapidly expanding through viral metagenomics. Novel circoviruses and RNA viruses in Tampa bay pink shrimp, annelovirus in sea lion, picornavirus in ringed seals and several new viruses of marine animals have been recently described using viral metagenomics and this tool has been also recently used in describing viral diversity in aquaculture ponds. Further, a large amount of information has been generated on the diversity of viruses in the marine environment using viral metagenomics during the last decade. There exists a great potential with viral metagenomics for discovering novel viruses in asymptomatic marine candidate animals of aquaculture/mariculture, some of which may assume pathogenic status under high density culture and stress. Additionally, viral metagenomics can help our understanding of viruses present in aquaculture/mariculture settings and routine pathogen surveillance programmes.

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Acknowledgments

First author is thankful to the Department of Biotechnology, Government of India for awarding overseas associateship for obtaining exposure on viral metagenomics, and to Dr. Mya Breitbart, University of South Florida, St. Petersburg, USA for providing opportunity to work in her laboratory.

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  1. Central Institute of Brackishwater Aquaculture, Chennai, 600028, India

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Alavandi, S.V., Poornima, M. Viral Metagenomics: A Tool for Virus Discovery and Diversity in Aquaculture. Indian J. Virol. 23, 88–98 (2012). https://doi.org/10.1007/s13337-012-0075-2

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