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Interferons are essential in fish resistance to viral infections. They induce interferon-stimulated genes, such as isg15. In this study, the Senegalese sole isg15 gene (ssisg15) has been characterized. As other isg15, ssisg15 contains a 402-bp intron sited in the 5′-UTR, and the full length cDNA is 1492-bp, including a 480-bp ORF. The expression analyses revealed basal levels of isg15 transcripts, and a clear induction after poly I:C injection, that reached maximum values in brain, head kidney and gills. The ssisg15 induction patterns were similar in RGNNV- and SJNNV-inoculated fish, whereas the reassortant (RG/SJ) isolate, which has higher replication fitness, triggered delayed but higher transcript levels. Furthermore, RG/SJ infection after poly I:C treatment reduced the induction of ssisg15 transcripts, suggesting an antagonistic mechanism against interferon type I system, that might allow an efficient viral replication at the initial steps of the infective process.Senegalese sole isg15 gene (ssisg15) contains a 402-bp intron in the 5′-UTR.Maximum levels of ssisg15 transcripts were reached in brain, head kidney and gills after poly I:C induction.RGNNV/SJNNV induced the highest levels of ssisg15 transcripts with a delayed onset.The RGNNV/SJNNV isolate reduces poly I:C induced ssisg15 transcript levels.