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Adaptation of chimeric retroviruses in vitro and in vivo: Isolation of avian retroviral vectors with extended host range

  1. Author:
    Barsov, E. V.
    Payne, W. S.
    Hughes, S. H.

  2. Author Address

    NCI, HIV Drug Resistance Program, Frederick Canc Res & Dev Ctr, POB B, Bldg 539, Room 130A, Frederick, MD 21702 USA. NCI, HIV Drug Resistance Program, Frederick Canc Res & Dev Ctr, Frederick, MD 21702 USA. Michigan State Univ, Dept Microbiol & Publ Hlth, E Lansing, MI 48824 USA. Hughes SH NCI, HIV Drug Resistance Program, Frederick Canc Res & Dev Ctr, POB B, Bldg 539, Room 130A, Frederick, MD 21702 USA.
    1. Year: 2001
  2. Journal: Journal of Virology
    1. 75
    2. 11
    3. Pages: 4973-4983
  4. Type of Article: Article
  1. Abstract:

    We have designed and characterized two new replication- competent avian sarcoma/leukosis virus-based retroviral vectors with amphotropic and ecotropic host ranges. The amphotropic vector RCASBP-M2C(797-8), was obtained by passaging the chimeric retroviral vector RCASBP-M2C(4070A) (6) in chicken embryos. The ecotropic vector, RCASBP(Eco), was created by replacing the env-coding region in the retroviral vector RCASBP(A) with the env region from an ecotropic murine leukemia virus. It replicates efficiently in avian DFJ8 cells that express murine ecotropic receptor. For both vectors, permanent cell lines that produce viral stocks with titers of about 5 x 10(6) CFU/ml on mammalian cells can be easily established by passaging transfected avian cells. Some chimeric viruses, for example, RCASBP(Eco), replicate efficiently without modifications, For those chimeric viruses that do require modification, adaptation by passage in vitro or in vivo is a general strategy. This strategy has been used to prepare vectors with altered host range and could potentially be used to develop vectors that would be useful for targeted gene delivery.

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