title: Rearrangement and mutagenesis of a shuttle vector plasmid after passage in mammalian cells.
abstract: A shuttle vector plasmid that contains sequences from simian virus 40, pBR322, and a bacterial marker gene, galactokinase, has been constructed. After replication in cells permissive for virus progeny, plasmid DNA was introduced into a galactokinase-deficient bacterial strain and the relative frequency of colonies with plasmids but without galactokinase activity was determined. This assay showed that 1% of the plasmids were defective after passage in the mammalian cells. Individual mutant plasmids were examined and found to contain deletions, duplications, point mutations, and insertions of cell DNA.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D002872:Chromosome Deletion; D004261:DNA Replication; D004251:DNA Transposable Elements; D005822:Genetic Vectors; D008970:Molecular Weight; D009154:Mutation; D010957:Plasmids
chemical_list: D004251:DNA Transposable Elements