Abstract
Reticuloendotheliosis virus strain T (Rev-T) induces a lethal lymphoma in young birds and transforms avian lymphoid cells in vitro. The transforming gene of Rev-T, v-rel, was derived from the turkey proto-oncogene c-rel. Comparison of the nucleotide sequences of v-rel and c-rel indicates that in addition to several internal amino acid changes relative to c-rel, p59v-rel has amino acid sequences at both ends derived from the reticuloendotheliosis virus strain A-related virus env gene (K. C. Wilhelmsen, K. Eggleton, and H. M. Temin, J. Virol. 52:172-182, 1984). In this report, the v-rel sequences important for transformation were defined by constructing recombinant retroviruses in which c-rel sequences replaced the analogous v-rel sequences. These recombinant viruses expressing chimeric proteins were tested for their ability to transform spleen cells in vitro and to induce tumors in young chickens. Activation of the oncogenicity of c-rel in Rev-T required alteration of the amino terminus and the central region of the protein. Deletion of the noncoding sequences 3' to c-rel and of most of the helper virus-related env sequences was necessary for the formation of Rev-T.
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