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| Subject Categories: Genome Stability & Dynamics |
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| The EMBO Journal
(2008) 27, 1378–1387, doi:10.1038/emboj.2008.65 Published online 3 April 2008 |
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| Mus81 is essential for sister chromatid recombination at broken replication forks |
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| Laura Roseaulin1, Yoshiki Yamada2, Yasuhiro Tsutsui3, Paul Russell2, Hiroshi Iwasaki4 and Benoit Arcangioli1 |
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1 Genomes and Genetic, Unite de la Dynamique du Génome, URA 2171 du CNRS, Institut Pasteur, Paris, France 2 Molecular Biology and Cell Biology, The Scripps Research Institute, La Jolla, CA, USA 3 Division of Mutagenesis, Department of Molecular Biology, National Institute of Genetics, Yata, Mishima, Shizuoka, Japan 4 International Graduate School of Arts and Sciences, Yokohama City University, Tsurumi-ku, Yokohama, Japan To whom correspondence should be addressed Benoit Arcangioli, Genomes and Genetic, Unite de la Dynamique du Génome, URA 2171 du CNRS, Institut Pasteur, 25 rue du Dr Roux, Paris Cedex 75724, France. Tel.: +33 1 4568 8454; Fax: +33 1 4568 8960; E-mail: barcan@pasteur.fr Received 13 November 2007; Accepted 6 March 2008; Published online 3 April 2008. |
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| Abstract |
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| Recombination is essential for the recovery of stalled/collapsed replication forks and therefore for the maintenance of genomic stability. The situation becomes critical when the replication fork collides with an unrepaired single-strand break and converts it into a one-ended double-strand break. We show in fission yeast that a unique broken replication fork requires the homologous recombination (HR) enzymes for cell viability. Two structure-specific heterodimeric endonucleases participate in two different resolution pathways. Mus81/Eme1 is essential when the sister chromatid is used for repair; conversely, Swi9/Swi10 is essential when an ectopic sequence is used for repair. Consequently, the utilization of these two HR modes of resolution mainly relies on the ratio of unique and repeated sequences present in various eukaryotic genomes. We also provide molecular evidence for sister recombination intermediates. These findings demonstrate that Mus81/Eme1 is the dedicated endonuclease that resolves sister chromatid recombination intermediates during the repair of broken replication forks. |
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| Keywords: recombination, replication collapse, sister chromatid recombination |
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