Abstract
DNA double-strand break (DSB) end resection is an essential step for homologous recombination. It generates 3' single-stranded DNA needed for the loading of the strand exchange proteins and DNA damage checkpoint proteins. To study the mechanism of end resection in fission yeast, we apply a robust, quantitative and inducible assay. Resection is followed at a single per genome DSB synchronously generated by the tet-inducible I-PpoI endonuclease. An additional assay to follow resection involves recombination between two direct repeats by single-strand annealing (SSA), since SSA requires extensive resection to expose two single-strand repeats for annealing. The kinetics of resection and SSA repair are then measured using Southern blots.
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