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Journal of Virology, February 2003, p. 1992-2002, Vol. 77, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.3.1992-2002.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Molecular and Functional Analysis of an Interferon Gene from the Zebrafish, Danio rerio{dagger}

Stephen M. Altmann, Mark T. Mellon, Daniel L. Distel, and Carol H. Kim*

Department of Biochemistry, Microbiology, and Molecular Biology, University of Maine, Orono, Maine 04469

Received 27 August 2002/ Accepted 5 November 2002

The interferon (IFN) family consisting of alpha IFN (IFN-{alpha}), IFN-ß, IFN-{omega}, IFN-{delta}, IFN-{kappa}, and IFN-{tau} is a large group of cytokines involved in the innate immune response against various microorganisms. Genes for IFN have been cloned from a variety of mammalian and avian species; however, IFN genes from lower-order vertebrates have not been forthcoming. Here, we report the cloning and characterization of the IFN gene from the zebrafish, Danio rerio. Zebrafish IFN (zfIFN) is 185 amino acids in length, with the first 22 amino acids representing a putative signal peptide. Treatment with the known IFN inducer polyinosinic acid-polycytidylic acid (poly[I]-poly[C]) resulted in an increase in zfIFN mRNA transcripts. zfIFN was also able to activate the IFN-inducible Mx promoter when cotransfected with a plasmid containing the zebrafish Mx promoter upstream of a luciferase reporter gene. To demonstrate antiviral activity, zebrafish cells were transfected with zfIFN and challenged with a fish rhabdovirus. A 36% reduction in plaque number was seen in zfIFN-transfected cells, compared to cells transfected with a control vector. Phylogenetic analysis has shown zfIFN to be approximately equally divergent from avian and mammalian IFN, consistent with its origin from an IFN present in the most recent common ancestor of these divergent lineages. A putative IFN from puffer, Fugu rubripes, was also found when zfIFN was used to search the fugu genome database, demonstrating that zfIFN can be used to find additional fish IFN genes. These results demonstrate that zebrafish can be used as an effective model for studying innate immunity and immune response to infectious disease.

* Corresponding author. Mailing address: Department of Biochemistry, Microbiology, and Molecular Biology, 5735 Hitchner Hall, University of Maine, Orono, ME 04469. Phone: (207) 581-2803. Fax: (207) 581-2801. E-mail: carolkim{at}maine.edu.

{dagger} Maine Agricultural and Forest Experiment Station publication 2568.

Journal of Virology, February 2003, p. 1992-2002, Vol. 77, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.3.1992-2002.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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