A Flp-nick system to study repair of a single protein-bound nick in vivo.
We present the Flp-nick system, which allows introduction of a protein-bound nick at a single genomic site in Saccharomyces cerevisiae and thus mimics a stabilized topoisomerase I-DNA cleavage complex. We took advantage of a mutant Flp recombinase that can introduce a nick at a specific Flp recombinase recognition target site that has been integrated in the yeast genome. The genetic requirement for cells to cope with this insult is the same as for cells treated with camptothecin, which traps topoisomerase I-DNA cleavage complexes genome-wide. Hence, a single protein-bound nick is enough to kill cells if functional repair pathways are lacking. The Flp-nick system can be used to dissect repair, checkpoint and replication fork management pathways activated by a single genomic insult, and it allows the study of events at the damage site, which so far has been impossible to address.
Nielsen
Ida
I
Department of Molecular Biology, University of Aarhus, Aarhus, Denmark.
Bentsen
Iben Bach
IB
Lisby
Michael
M
Hansen
Sabine
S
Mundbjerg
Kamilla
K
Andersen
Anni H
AH
Bjergbaek
Lotte
L
D053904:DNA Breaks, Single-Stranded; D004249:DNA Damage / Q000502:physiology*; D004254:DNA Nucleotidyltransferases / Q000235:genetics*; D004260:DNA Repair / Q000502:physiology*; D004269:DNA, Bacterial / Q000235:genetics*; D016297:Mutagenesis, Site-Directed / Q000379:methods*; D012441:Saccharomyces cerevisiae / Q000235:genetics*
D004269:DNA, Bacterial; D004254:DNA Nucleotidyltransferases; C045119:FLP recombinase