title: Integration of type B retroviral DNA in virus-induced primary murine thymic lymphomas.
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.
mesh_terms: D000818:Animals; D002472:Cell Transformation, Viral; D002874:Chromosome Mapping; D004279:DNA, Viral / Q000235:genetics; D008223:Lymphoma / Q000382:microbiology*; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics*; D051379:Mice; D008815:Mice, Inbred Strains; D012190:Retroviridae / Q000235:genetics*; D013953:Thymus Neoplasms / Q000382:microbiology*
chemical_list: D004279:DNA, Viral