Abstract
In previous studies we described the isolation and characterization of a highly leukemogenic virus, DMBA-LV, isolated from a transplanted, chemical carcinogen-induced thymic lymphoma. The virus is composed of a mixture of two unrelated retroviral genomes, one highly related to type B milk-borne mouse mammary tumor virus isolates and the other partially related to type C viral genomes. In the present study, primary thymic lymphomas induced by DMBA-LV in CFW/D, NIH Swiss, C3H/Bi/Ka, and C57BL/Ka mice were assessed for the presence of newly integrated type B retroviral DNA. All 46 primary thymic lymphomas examined contained one to four newly acquired murine mammary tumor virus proviruses. Based on the sizes of provirus-cell DNA junction fragments, the integration of newly acquired murine mammary tumor virus proviruses did not appear to be random.
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