A chimeric GB virus B with 5′ nontranslated RNA sequence from hepatitis C virus causes hepatitis in tamarins

Authors

  • Rene Rijnbrand,

    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
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    • R.R. was the Blowitz-Ridgeway Foundation Special Liver Scholar of the American Liver Foundation.

  • Yan Yang,

    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
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  • Lucy Beales,

    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
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  • Francis Bodola,

    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
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  • Kathryn Goettge,

    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
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  • Lisette Cohen,

    1. Unité de Génétique Moléculaire des Virus Respiratoires, CNRS URA 1966, Institut Pasteur, Paris, France
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  • Robert E. Lanford,

    1. Department of Virology and Immunology, Southwest Foundation for Biomedical Research, San Antonio, TX
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  • Stanley M. Lemon,

    Corresponding author
    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
    • Hepatitis Research Center, 4.104 Medical Research Building, The University of Texas Medical Branch, Galveston, TX 77555-1019
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    • fax: 409-747-7030

  • Annette Martin

    Corresponding author
    1. Department of Microbiology & Immunology and Institute for Human Infections & Immunity, The University of Texas Medical Branch, Galveston, TX
    2. Unité de Génétique Moléculaire des Virus Respiratoires, CNRS URA 1966, Institut Pasteur, Paris, France
    • Unité de Génétique Moléculaire des Virus Respiratoires, CNRS URA 1966, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris, Cedex 15, France
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    • fax: (33) 1 40 61 30 45


  • Potential conflict of interest: Nothing to report

Abstract

Only humans and chimpanzees are fully permissive for replication of hepatitis C virus (HCV), an important cause of liver cirrhosis and cancer worldwide. The absence of suitable animal models limits opportunities for in vivo evaluation of candidate hepatitis C therapeutics and slows progress in the field. Here, we describe a chimeric virus derived from GB virus B (GBV-B), an unclassified hepatotropic member of the family Flaviviridae that is closely related to HCV and infects tamarins (Saguinus sp.), in which a functionally important HCV regulatory sequence replaced an analogous sequence in the 5′ nontranslated region (5′NTR) of the GBV-B genome. The transplanted sequence comprised domain III of the internal ribosome entry site (IRES), which directly binds the 40S ribosome subunit and is a target for candidate therapeutics. The chimeric 5′NTR retained ribosome binding activity and was competent in directing protein translation both in cell-free translation reactions and in transfected primary tamarin hepatocyte cultures. Virus rescued from the chimeric RNA replicated in the liver of tamarins, causing biochemical and histopathological changes typical of viral hepatitis. However, adaptive mutations were required elsewhere in the genome for efficient replication. Virus was not rescued from other, translationally competent, chimeric RNAs in which domain II of the IRES was exchanged. Thus, the 5′NTR appears to contain virus-specific replication signals that interact with other sites within the viral genome or with viral proteins. In conclusion, such novel chimeric flaviviruses offer opportunities for new insights into HCV replication mechanisms, while potentially facilitating the evaluation of candidate therapeutics in vivo. Supplementary material for this article can be found on the HEPATOLOGYwebsitehttp://www.interscience.wiley.com/jpages/0270-9139/suppmat/index.html. (HEPATOLOGY 2005.)

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