title: Site-directed insertion of long single-stranded DNA fragments into plasmid DNA.
abstract: A new site-directed method for inserting long single-stranded DNA fragments into any region of a duplex vector is described. Its major advantage is independence of the location of the restriction sites. The method involves the assembly of single-stranded DNA fragments by ligation to both ends of the inserted fragments of two cohesive flanks that are complementary to the target region. Short oligonucleotide templates are used to direct the ligation. The resulting fragments, designated further as omega fragments with cohesive flanks, are hybridized with a gapped DNA vector. The heteroduplexes are transformed into Escherichia coli cells without enzymatic filling and sealing of gapped DNA. As a consequence of intracellular repair and heteroduplex resolution, insertion mutants are recovered. To demonstrate the method's efficiency, we inserted a 51-nucleotide synthetic DNA fragment containing a modified glucocorticoid receptor binding site into the region of pBR322, near the transcription starting point of the tet gene. The method we developed makes possible site-directed insertion of synthetic and genome-derived DNA fragments at least 200 nucleotides long.
authors.affiliation: Institute of Cytology and Genetics, Siberian Department of the USSR Academy of Sciences, Novosibirsk.
authors.forename: A V
authors.initials: AV
authors.lastname: Mazin
authors.forename: M K
authors.initials: MK
authors.lastname: Saparbaev
authors.forename: L P
authors.initials: LP
authors.lastname: Ovchinnikova
authors.forename: G L
authors.initials: GL
authors.lastname: Dianov
authors.forename: R I
authors.initials: RI
authors.lastname: Salganik
mesh_terms: D001483:Base Sequence; D004260:DNA Repair; D004277:DNA, Single-Stranded / Q000235:genetics*; D005818:Genetic Engineering / Q000379:methods*; D008969:Molecular Sequence Data; D009154:Mutation; D009692:Nucleic Acid Heteroduplexes / Q000378:metabolism; D010957:Plasmids; D011965:Receptors, Glucocorticoid / Q000235:genetics; D011995:Recombination, Genetic; D014162:Transfection
chemical_list: D004277:DNA, Single-Stranded; D009692:Nucleic Acid Heteroduplexes; D011965:Receptors, Glucocorticoid