title: Genome structure of mink cell focus-forming murine leukemia virus in epithelial mink lung cells transformed vitro by iododeoxyuridine-induced C3H/MuLV cells.
abstract: We characterized mink cell focus-forming murine leukemia viruses that were isolated from C3H/MCA-5 cells after induction with 5-iododeoxyuridine in culture. Mink lung epithelial cells malignantly transformed in vitro by induced virus were the source of four molecular clones of mink cell focus-forming virus. CI-1, CI-2, CI-3, and CI-4. Three clones, CI-1, CI-2, and CI-3, had full-length mink cell focus-forming viral genomes, one of which (CI-3) was infectious. In addition, we obtained a defective viral genome (CI-4) which had a deletion in the envelope gene. A comparison between the envelope genes of CI-4 and those of spleen focus-forming virus by heteroduplex mapping showed close homology in the substitution region and defined the deletion as being identical to the p15E deletion of spleen focus-forming virus. The recombinant mink cell focus-forming genomes are not endogenous in C3H/MCA-5 cells and therefore must have been formed in culture after induction by 5-iododeoxyuridine. CI-3, the infectious clone of mink cell focus-forming murine leukemia virus, was dualtropic, and mink cells infected with CI-3 were altered in their response to epidermal growth factor. In the presence of epidermal growth factor at 10 ng/ml, uninfected mink cells retained their epithelial morphology in monolayer culture and did not form colonies in soft agar. In contrast, CI-3 virus-infected mink cells grew with fibroblastic morphology in monolayer culture and showed an increased growth rate in soft agar in the presence of epidermal growth factor.
mesh_terms: D000406:AKR murine leukemia virus / Q000235:genetics; D000818:Animals; D002478:Cells, Cultured; D004279:DNA, Viral / Q000235:genetics; D005814:Genes, Viral; D007065:Idoxuridine / Q000494:pharmacology; D009052:Leukemia Virus, Murine / Q000235:genetics*; D007942:Leukemia, Experimental / Q000382:microbiology; D008168:Lung; D051379:Mice; D008809:Mice, Inbred C3H / Q000382:microbiology; D008907:Mink; D009693:Nucleic Acid Hybridization; D014759:Viral Envelope Proteins; D014764:Viral Proteins / Q000235:genetics; D014776:Virus Cultivation
chemical_list: D004279:DNA, Viral; D014759:Viral Envelope Proteins; D014764:Viral Proteins; D007065:Idoxuridine