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J Virol. 1982 Nov;44(2):742-6.

Orientation and position of avian leukosis virus DNA relative to the cellular oncogene c-myc in B-lymphoma tumors of highly susceptible 15I5 X 7(2) chickens.


We previously reported our characterizations of the B-lymphoma tumors induced in a highly susceptible line of chickens (15I5 X 7(2)) by the avian leukosis virus RAV-1 (Proc. Natl. Acad. Sci. 78:3418-3422, 1981). We demonstrated that in greater than 90% of the tumors, the RAV-1 provirus is integrated near a cellular oncogene, c-myc. In the present study, we devised a simple approach, relying on SalI digestion, for further defining the locations and orientations of the proviruses with respect to the c-myc gene. We report here that in the great majority of cases the provirus is situated upstream from and in the same transcriptional direction as the c-myc gene--a configuration compatible with the promoter-insertion model proposed by Hayward et al. (Nature [London] 290:475-480, 1981).

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