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Science 13 July 2007:
Vol. 317. no. 5835, pp. 242 - 245
DOI: 10.1126/science.1140649
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Reports

Postreplicative Formation of Cohesion Is Required for Repair and Induced by a Single DNA Break

Lena Ström,1 Charlotte Karlsson,1 Hanna Betts Lindroos,1 Sara Wedahl,1 Yuki Katou,2 Katsuhiko Shirahige,2 Camilla Sjögren1*

Sister-chromatid cohesion, established during replication by the protein complex cohesin, is essential for both chromosome segregation and double-strand break (DSB) repair. Normally, cohesion formation is strictly limited to the S phase of the cell cycle, but DSBs can trigger cohesion also after DNA replication has been completed. The function of this damage-induced cohesion remains unknown. In this investigation, we show that damage-induced cohesion is essential for repair in postreplicative cells in yeast. Furthermore, it is established genome-wide after induction of a single DSB, and it is controlled by the DNA damage response and cohesin-regulating factors. We thus define a cohesion establishment pathway that is independent of DNA duplication and acts together with cohesion formed during replication in sister chromatid–based DSB repair.

1 Department of Cell and Molecular Biology, Karolinska Institute, 171 77 Stockholm, Sweden.
2 Gene Research Centre, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 226-8501 Yokohama, Japan.

* To whom correspondence should be addressed. E-mail: camilla.sjogren{at}ki.se

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