title: Triple helix directed psoralen adducts induce a low frequency of recombination in an SV40 shuttle vector.
abstract: Triple helix forming oligonucleotide directed psoralen adducts in a mammalian shuttle vector have been reported to be repaired efficiently in human cells. In this study we examined the role of intermolecular homologous recombination in triple helix targeted psoralen adduct repair. A simian virus 40 (SV40) shuttle vector carrying a mutated supF gene was treated with a triplex forming oligonucleotide psoralen conjugate and cotransfected into human cells with a second plasmid bearing the wild type supF gene. Recombinants with a reactivated marker gene were detected by an X-gal assay in indicator bacteria. We could observe a low frequency of psoralen adduct induced recombination indicating that recombination does not play a major role in triplex directed psoralen adduct repair. The implications for targeted mutagenesis by triple helix forming oligonucleotides are discussed.
authors.affiliation: Department of Medical Microbiology, University of Lund, General Hospital, Malmö, Sweden.
authors.forename: Z
authors.initials: Z
authors.lastname: Sandor
authors.forename: A
authors.initials: A
authors.lastname: Bredberg
mesh_terms: D001483:Base Sequence; D002460:Cell Line; D004260:DNA Repair; D011564:Furocoumarins / Q000737:chemistry* / Q000494:pharmacology; D005822:Genetic Vectors; D006801:Humans; D008969:Molecular Sequence Data; D016296:Mutagenesis; D009841:Oligonucleotides / Q000737:chemistry* / Q000494:pharmacology; D011995:Recombination, Genetic / Q000187:drug effects; D013539:Simian virus 40 / Q000235:genetics*; D014162:Transfection
chemical_list: D011564:Furocoumarins; D009841:Oligonucleotides