Abstract
The precise organization of the genome inside the cell nucleus is vital to many cell functions including gene expression, cell division, and DNA repair. Here we describe a method to measure pairing of DNA loci during homologous recombination (HR) at a site-specific double-strand break (DSB) in Saccharomyces cerevisiae. This method utilizes a chromosome tagging system in diploid yeast cells to visualize both the DNA at the break site and the homologous DNA that serves as a repair template. DNA repair products are confirmed in parallel by genomic blot. This visualization method provides insight into the physical contact that occurs between homologous loci during HR and correlates physical interaction with the timing of DNA repair.
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