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Recruitment of cohesin to heterochromatic regions by Swi6/HP1 in fission yeast

Nature Cell Biology volume 4, pages 8993 (2002) | Download Citation

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Abstract

Fission yeast centromeres, like those of higher eukaryotes, are composed of repeated DNA structures and associated heterochromatin protein complexes, that have a critical function in the faithful segregation of chromosomes during cell division1,2,3. Cohesin protein complexes, which are essential for sister-chromatid cohesion and proper chromosome segregation, are enriched at centromeric repeats4,5. We have identified a functional and physical link between heterochromatin and cohesin. We find that the preferential localization of cohesins at the centromeric repeats is dependent on Swi6, a conserved heterochromatin protein that is required for proper kinetochore function. Cohesin is also enriched at the mating-type heterochromatic region in a manner that depends on Swi6 and is required to preserve the genomic integrity of this locus. We provide evidence that a cohesin subunit Psc3 interacts with Swi6 and its mouse homologue HP1. These data define a conserved function of Swi6/HP1 in recruitment of cohesin to heterochromatic regions, promoting the proper segregation of chromosomes.

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Acknowledgements

We thank J. P. Cooper, K. Tatebayashi, R. C. Allshire, O. Niwa and M. Yanagida for providing strains and plasmids, and P. Nurse, J. P. Cooper, A. W. Murray and K. Nasmyth for valuable discussion. Y.W. thanks all the members of M. Yamamoto's laboratory for their support. This work was supported in part by grants from the Ministry of Education, Science, and Culture of Japan, and NIH grant 59772.

Author information

Author notes

    • Nobuhiro Nonaka
    •  & Tomoya Kitajima

    These authors contributed equally to this work.

Affiliations

  1. Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan

    • Nobuhiro Nonaka
    • , Tomoya Kitajima
    • , Shihori Yokobayashi
    • , Masayuki Yamamoto
    •  & Yoshinori Watanabe
  2. Cold Spring Harbor Laboratory, Post Office Box 100, Cold Spring Harbor, New York 11724, USA

    • Guoping Xiao
    •  & Shiv I. S. Grewal
  3. PRESTO, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan

    • Yoshinori Watanabe

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Corresponding author

Correspondence to Yoshinori Watanabe.

Supplementary information

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    Supplementary information

    The effect of psc3 and swi6 mutations on silencing of ura4+ inserted at the mating-type region or cen1.

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DOI

https://doi.org/10.1038/ncb739

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