Condensin I protects meiotic cohesin from WAPL-1 mediated removal

PLoS Genetics
Margarita R HernandezGyörgyi Csankovszki

Abstract

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 chr...Continue Reading

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Citations

Feb 20, 2020·International Journal of Molecular Sciences·Xin HuLupei Zhang
Apr 22, 2020·Chromosoma·Kristina KleinschnitzStefan K Heidmann

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Methods Mentioned

BETA
Fluorescence
acetylation
electron microscopy
immunoprecipitation
pull down
superresolution microscopy
dissection
PCR

Software Mentioned

Prism
Slidebook

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