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  • Title: Identification and characterization of Japanese flounder, Paralichthys olivaceus interferon-stimulated gene 15 (Jf-ISG15).
    Author: Yasuike M, Kondo H, Hirono I, Aoki T.
    Journal: Comp Immunol Microbiol Infect Dis; 2011 Jan; 34(1):83-91. PubMed ID: 20299096.
    Abstract:
    Previously, using cDNA microarray analysis, we demonstrated that an EST clone of Japanese flounder (Paralichthys olivaceus) with homology to mammalian interferon-stimulated gene 15 (ISG15) was strongly induced by treatment with DNA vaccine encoding the glycoprotein gene of Hirame rhabdovirus (HIRRV). In this study, we conducted molecular cloning and expression analysis of the Japanese flounder ISG15 (Jf-ISG15). Jf-ISG15 encoded two exons. The first exon was non-coding, while the second exon encoded a protein of 158 amino acids. The coded protein has two tandem ubiquitin-like domains with a carboxyl-terminus conjugation motif "LRLRGG". Phylogenetic analysis revealed an evolutionary relationship among Jf-ISG15, mammalian and fish ISG15 orthologues. The interferon-stimulated response element (ISRE) sites were conserved among DNA sequences of Jf-ISG15 and mammalian ISG15 promoter regions. An RT-PCR analysis of healthy tissues showed that Jf-ISG15 mRNA was notably strongly expressed in gills, PBLs and spleen. Expression of Jf-ISG15 was strongly induced by poly-I:C treatment in head-kidney cells, peripheral blood leukocytes (PBLs) and spleen cells, and by HIRRV infection in kidney of juvenile fish suggesting that Jf-ISG15 plays a role in fish antiviral response.
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