Sororin actively maintains sister chromatid cohesion
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44318_2016_Article_BFEMBJ201592532.pdf
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Author(s)
Ladurner, Rene
Kreidl, Emanuel
Ivanov, Miroslav P.
Ekker, Heinz
Idarraga‐Amado, Maria H.
Busslinger, Georg A.
Wutz, Gordana
Cisneros, David A.
Peters, Jan‐Michael
Date Issued
February 22, 2016
Journal
The EMBO Journal
Publisher
Nature Publishing Group UK
Citation
EMBO J (2016) 35: 635 - 653
Version
Final published version
Abstract
Cohesion between sister chromatids is established during DNA replication but needs to be maintained to enable proper chromosome–spindle attachments in mitosis or meiosis. Cohesion is mediated by cohesin, but also depends on cohesin acetylation and sororin. Sororin contributes to cohesion by stabilizing cohesin on DNA. Sororin achieves this by inhibiting WAPL, which otherwise releases cohesin from DNA and destroys cohesion. Here we describe mouse models which enable the controlled depletion of sororin by gene deletion or auxin‐induced degradation. We show that sororin is essential for embryonic development, cohesion maintenance, and proper chromosome segregation. We further show that the acetyltransferases ESCO1 and ESCO2 are essential for stabilizing cohesin on chromatin, that their only function in this process is to acetylate cohesin's SMC3 subunit, and that DNA replication is also required for stable cohesin–chromatin interactions. Unexpectedly, we find that sororin interacts dynamically with the cohesin complexes it stabilizes. This implies that sororin recruitment to cohesin does not depend on the DNA replication machinery or process itself, but on a property that cohesin acquires during cohesion establishment.
MIT Department
Koch Institute for Integrative Cancer Research at MIT
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.15252/embj.201592532
