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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Tissue distribution of Red Spotted Grouper Nervous Necrosis Virus (RGNNV) genome in experimentally infected juvenile European seabass (Dicentrarchus labrax)
Author(s): Lopez Jimena, Benjamin
Alonso, Maria del Carmen
Thompson, Kimberly
Adams, Alexandra
Infante, Carlos
Castro, Dolores
Borrego, Juan J
Garcia-Rosado, Esther
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Keywords: European seabass
RGNNV genotype
Tissue distribution
Quantitative real-time PCR
In situ hybridization
European seabass fisheries
European seabass.
Issue Date: Dec-2011
Date Deposited: 12-Jun-2013
Citation: Lopez Jimena B, Alonso MdC, Thompson K, Adams A, Infante C, Castro D, Borrego JJ & Garcia-Rosado E (2011) Tissue distribution of Red Spotted Grouper Nervous Necrosis Virus (RGNNV) genome in experimentally infected juvenile European seabass (Dicentrarchus labrax). Veterinary Microbiology, 154 (1-2), pp. 86-95.
Abstract: The distribution of viral genome in the tissues of juvenile European seabass (Dicentrarchus labrax) during the course of a Red Spotted Grouper Nervous Necrosis Virus (RGNNV) infection has not yet been described. The present study addresses this and indicates which target organs may be involved in viral replication. This information should enable more accurate detection of virus in asymptomatic carriers, and in turn help to control the spread of the disease. The aim of this study was to examine the pattern of expression of viral genomic segments RNA1 and RNA2, using two absolute real-time PCRs (RT-qPCR), over the course of a RGNNV infection after administering the virus by intramuscular injection. In situ hybridization was also used to locate the RNA2 viral segment in different organs throughout the infection. The experimental challenge provoked an acute form of viral nervous necrosis (VNN), with a resulting cumulative mortality of 37%. The RT-qPCRs designed allowed the detection of both genomic segments in all the organs tested (nervous and non-nervous tissues) at all sampling times examined. The highest viral RNA copy number was found in eyes, although viral replication appeared to begin in the brain. Viral replication was also recorded in pooled internal organs and in caudal fin. However, the increase in the viral RNA copy number in these organs did not result in an increased viral titre, which may indicate that a productive infection does not take place in non-nervous tissues, possibly due to a failure in a viral post-replication step.
DOI Link: 10.1016/j.vetmic.2011.06.029
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