Open AccessIn vitro repair of double-strand breaks accompanied by recombination in bacteriophage T7 DNA
Author(s) -
Warren E. Masker
Publication year - 1992
Publication title -
journal of bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.652
H-Index - 246
eISSN - 1067-8832
pISSN - 0021-9193
DOI - 10.1128/jb.174.1.155-160.1992
Subject(s) - biology , in vitro recombination , dna , homologous recombination , plasmid , bacteriophage , genetics , microbiology and biotechnology , phagemid , dna replication , dna repair , replication protein a , genetic recombination , recombination , molecular cloning , gene , escherichia coli , dna binding protein , peptide sequence , transcription factor
A double-strand break in a bacteriophage T7 genome significantly reduced the ability of that DNA to produce viable phage when the DNA was incubated in an in vitro DNA replication and packaging system. When a homologous piece of T7 DNA (either a restriction fragment or T7 DNA cloned into a plasmid) that was by itself unable to form a complete phage was included in the reaction, the break was repaired to the extent that many more viable phage were produced. Moreover, repair could be completed even when a gap of about 900 nucleotides was put in the genome by two nearby restriction cuts. The repair was accompanied by acquisition of a genetic marker that was present only on the restriction fragment or on the T7 DNA cloned into a plasmid. These data are interpreted in light of the double-strand gap repair mode of recombination.