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Fish reovirus GCReV-109 VP33 protein elicits protective immunity in rare minnows. | LitMetric

Fish reovirus GCReV-109 VP33 protein elicits protective immunity in rare minnows.

Arch Virol

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Wuhan, 430072, China.

Published: March 2016

AI Article Synopsis

Article Abstract

Grass carp reovirus strain 109 (GCReV-109) was previously isolated from a grass carp (Ctenopharyngodon idellus) with hemorrhagic disease, and its complete genome has been sequenced. However, the infectivity of GCReV-109 has not been studied, and the viral protein VP33, encoded on genome segment S11, had no detectable sequence homology to other known reovirus proteins. In this study, we characterized GCReV-109 infections in vivo and in vitro, as well as the VP33 protein. Infectivity analysis showed that GCReV-109 caused severe hemorrhagic disease and 100% mortality at dilutions up to 10(-4) in rare minnows (Gobiocypris rarus) by 8 days postinfection, but no visible cytopathic effect was observed in GCReV-109-infected subcultured grass carp muscle (GCM) cells. To confirm that GCReV-109 could be propagated in GCM cells, three virus genome segments were detected by RT-PCR, and large numbers of virus particles were observed by transmission electron microscopy in samples from the infected GCM cells. The suspension of GCReV-109-infected GCM cells was pathogenic to rare minnows. VP33 protein was expressed and purified for generation of an anti-VP33 antiserum. In western blot analysis of purified GCReV-109 particles, the antiserum specifically recognized a protein band (approximately 33 kDa). This revealed that VP33 is a major structural protein of GCReV-109 that might have immunogenic properties. The protective efficacy of the anti-VP33 antiserum against GCReV-109 infection was tested. The death of infected fish was delayed and the mortality fell to 10% when fish were treated with the anti-VP33 antiserum, suggesting that it might be useful for the prevention and control of fish reoviral disease.

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Source
http://dx.doi.org/10.1007/s00705-015-2675-9DOI Listing

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