• Viruses Basel · Jun 2011

    Review

    Orf-I and orf-II-encoded proteins in HTLV-1 infection and persistence.

    • Dustin Edwards, Claudio Fenizia, Heather Gold, Maria Fernanda de Castro-Amarante, Cody Buchmann, Cynthia A Pise-Masison, and Genoveffa Franchini.
    • Animal Models and Retroviral Vaccines Section, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, MD 20892, USA. edwardsd2@mail.nih.gov
    • Viruses Basel. 2011 Jun 1; 3 (6): 861-85.

    AbstractThe 3' end of the human T-cell leukemia/lymphoma virus type-1 (HTLV-1) genome contains four overlapping open reading frames (ORF) that encode regulatory proteins. Here, we review current knowledge of HTLV-1 orf-I and orf-II protein products. Singly spliced mRNA from orf-I encodes p12, which can be proteolytically cleaved to generate p8, while differential splicing of mRNA from orf-II results in production of p13 and p30. These proteins have been demonstrated to modulate transcription, apoptosis, host cell activation and proliferation, virus infectivity and transmission, and host immune responses. Though these proteins are not essential for virus replication in vitro, p8, p12, p13, and p30 have an important role in the establishment and maintenance of HTLV-1 infection in vivo.

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