title: Transformation-defective mutants of Rous sarcoma virus with longer sizes of genome RNA and their highly frequent occurrences.
abstract: Transformation-defective (td) mutants with different sizes of genomic RNA were isolated from the Prague strain of Rous sarcoma virus, subgroup C(PR-C). All six td viruses (tdTYPR-C) isolated from a single UV-irradiated stock of PR-C (clone 2 of TYPR-C) had slightly longer RNA than did the ordinary class b RNA of tdB77 and Rous-associated virus-7. td viruses spontaneously segregated in uncloned TYPR-C also contained genomic RNA of a size similar to tdTYPR-C RNA. On the other hand, two td mutants isolated from another stock of PR-C (LAPR-C) had the class b RNA. Fingerprint analysis confirmed that tdTYPR-C and tdLAPR-C were derived by deletion from clone 2 of TYPR-C and LAPR-C, respectively, and also showed that clone 2 of TYPR-C had sequences in its genome RNA different from those of LAPR-C, although it gave a fingerprinting pattern similar to the latter. These results strongly suggest that differences between the nucleotide sequences in TYPR-C and LAPR-C RNA may result in different extents of deletion.
mesh_terms: D001358:Avian Sarcoma Viruses / Q000235:genetics*; D001483:Base Sequence; D002472:Cell Transformation, Viral; D005814:Genes, Viral; D009154:Mutation; D009843:Oligoribonucleotides / Q000032:analysis; D012367:RNA, Viral / Q000032:analysis / Q000235:genetics*
chemical_list: D009843:Oligoribonucleotides; D012367:RNA, Viral