Strand Asymmetry Influences Mismatch Resolution During a Single-strand Annealing

Overview

Journal Genome Biol

Specialties Biology
Genetics

Date 2022 Apr 13

PMID 35414014

Authors

Victoria O Pokusaeva

Aranzazu Rosado Diez

Lorena Espinar

Albert Torello Perez

Guillaume J Filion

Affiliations

Soon will be listed here.

Abstract

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. We insert thousands of barcoded transposons carrying a reporter of DNA mismatch repair in the genome of mouse embryonic stem cells. Upon inducing a double-strand break between tandem repeats, a mismatch is generated if the break is repaired through single-strand annealing. The resolution of the mismatch showed a 60-80% bias in favor of the strand with the longest 3' flap. The location of the lesion in the genome and the type of mismatch had little influence on the bias. Instead, we observe a complete reversal of the bias when the longest 3' flap is moved to the opposite strand by changing the position of the double-strand break in the reporter.

Conclusions: These results suggest that the processing of the double-strand break has a major influence on the repair of mismatches during a single-strand annealing.

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

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