Strand asymmetry influences mismatch resolution during a single-strand annealing.

Background: Biases of DNA repair can shape the nucleotide landscape of genomes at evolutionary timescales. The molecular mechanisms of those biases are still poorly understood because it is difficult to isolate the contributions of DNA repair from those of DNA damage.

Results: Here, we develop a genome-wide assay whereby the same DNA lesion is repaired in different genomic contexts.