title: Rescue of chromosomal T-antigen sequences onto extrachromosomally replicating, defective simian virus 40 DNA by homologous recombination.
abstract: Recombination between chromosomal and extrachromosomal DNA sequences was analyzed by investigation of the recombinational rescue of a 1,018-base-pair (bp) segment of the T-antigen gene of simian virus 40 from the chromosome of monkey COS cells to two different, extrachromosomally replicating, simian virus 40 DNA molecules lacking this 1,018-bp sequence. The ratio of rescued to unrecombined virus was as high as 10(-3). The rescued molecules, detected optimally 5 to 9 days after transfection of COS cells, had completely recovered the 1,018-bp DNA segment from the chromosome. The recombination event is proposed to occur either by double reciprocal recombination or by gene conversion between the chromosomal T-antigen gene and the extrachromosomal molecules missing the 1,018-bp sequence.
mesh_terms: D000818:Animals; D000952:Antigens, Polyomavirus Transforming; D000957:Antigens, Viral, Tumor / Q000235:genetics*; D001483:Base Sequence; D002460:Cell Line; D002875:Chromosomes / Q000502:physiology; D004261:DNA Replication; D003673:Defective Viruses / Q000235:genetics*; D005796:Genes; D005814:Genes, Viral; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D011494:Protein Kinases / Q000235:genetics*; D013539:Simian virus 40 / Q000235:genetics*; D014779:Virus Replication
chemical_list: D000952:Antigens, Polyomavirus Transforming; D000957:Antigens, Viral, Tumor; D009856:Oncogene Proteins, Viral; D011494:Protein Kinases