4.6 Article

Condensin I protects meiotic cohesin from WAPL-1 mediated removal

Journal

PLOS GENETICS
Volume 14, Issue 5, Pages -

Publisher

PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pgen.1007382

Keywords

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Funding

  1. National Institute of General Medical Sciences [NIH R01 GM079533, NIH R15 GM117548]
  2. Michigan Predoctoral Training in Genetics [T32 GM007544]
  3. Cleveland State University start-up funds
  4. Mary Sue and Kenneth Coleman Graduate Fellowship at the University of Michigan
  5. NIH Office of Research Infrastructure Program [P40 OD010440]

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Condensin complexes are key determinants of higher-order chromatin structure and are required for mitotic and meiotic chromosome compaction and segregation. We identified a new role for condensin in the maintenance of sister chromatid cohesion during C. elegans meiosis. Using conventional and stimulated emission depletion (STED) microscopy we show that levels of chromosomally-bound cohesin were significantly reduced in dpy-28 mutants, which lack a subunit of condensin I. SYP-1, a component of the synaptonemal complex central region, was also diminished, but no decrease in the axial element protein HTP-3 was observed. Surprisingly, the two key meiotic cohesin complexes of C. elegans were both depleted from meiotic chromosomes following the loss of condensin I, and disrupting condensin I in cohesin mutants increased the frequency of detached sister chromatids. During mitosis and meiosis in many organisms, establishment of cohesion is antagonized by cohesin removal by Wapl, and we found that condensin I binds to C. elegans WAPL-1 and counteracts WAPL-1-dependent cohesin removal. Our data suggest that condensin I opposes WAPL-1 to promote stable binding of cohesin to meiotic chromosomes, thereby ensuring linkages between sister chromatids in early meiosis.

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