Reference: Muñoz-Galván S, et al. (2017) A new role for Rrm3 in repair of replication-born DNA breakage by sister chromatid recombination. PLoS Genet 13(5):e1006781

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Abstract


Replication forks stall at different DNA obstacles such as those originated by transcription. Fork stalling can lead to DNA double-strand breaks (DSBs) that will be preferentially repaired by homologous recombination when the sister chromatid is available. The Rrm3 helicase is a replisome component that promotes replication upon fork stalling, accumulates at highly transcribed regions and prevents not only transcription-induced replication fork stalling but also transcription-associated hyper-recombination. This led us to explore the possible role of Rrm3 in the repair of DSBs when originating at the passage of the replication fork. Using a mini-HO system that induces mainly single-stranded DNA breaks, we show that rrm3Δ cells are defective in DSB repair. The defect is clearly seen in sister chromatid recombination, the major repair pathway of replication-born DSBs. Our results indicate that Rrm3 recruitment to replication-born DSBs is crucial for viability, uncovering a new role for Rrm3 in the repair of broken replication forks.

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Journal Article
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Muñoz-Galván S, García-Rubio M, Ortega P, Ruiz JF, Jimeno S, Pardo B, Gómez-González B, Aguilera A
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