title: Specific integration of recombinant proviral sequences in ecotropic Gross virus-accelerated AKR thymomas.
abstract: Integration and amplification of ecotropic and recombinant proviral sequences in high-molecular-weight cellular DNAs from ecotropic Gross virus-accelerated AKR thymomas were analyzed using an ecotropic-specific probe, p400, and an envelope-specific probe, pAKV-5. New ecotropic proviral sequences were detected at three sites in the DNAs from eight Gross virus-accelerated thymomas following EcoRI restriction endonuclease digestion and at six sites following PvuII restriction endonuclease digestion. The integration of these new ecotropic proviral sequences appeared to be random. Recombinant 3' proviral-cellular DNA junction fragments were detected at 30 sites following digestion with EcoRI. These new recombinant fragments ranged in size from 9.0 to 2.5 kb with 6/8 thymoma DNAs containing a fragment of 2.7 kb. PvuII generated new recombinant 3' proviral-cellular junction fragments that ranged in size from 12.5 to 2.1 kb with 5/8 thymoma DNAs containing a fragment of 2.5 kb. It appears that the leukemia-accelerating ecotropic Gross virus is responsible for the generation of a unique 3' recombinant proviral-cellular junction fragment. This fragment can be detected against a background of randomly integrated ecotropic and recombinant proviruses.
mesh_terms: D000406:AKR murine leukemia virus / Q000235:genetics*; D000818:Animals; D004262:DNA Restriction Enzymes; D004279:DNA, Viral / Q000235:genetics; D015246:Deoxyribonuclease EcoRI; D015252:Deoxyribonucleases, Type II Site-Specific; D005814:Genes, Viral; D007942:Leukemia, Experimental / Q000382:microbiology*; D051379:Mice; D008806:Mice, Inbred AKR; D008908:Mink Cell Focus-Inducing Viruses / Q000235:genetics; D011995:Recombination, Genetic; D013945:Thymoma / Q000382:microbiology*; D013953:Thymus Neoplasms / Q000382:microbiology*
chemical_list: D004279:DNA, Viral; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; C025630:CAGCTG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific