Kinetochore component function in C. elegans oocytes revealed by 4D tracking of holocentric chromosomes

Laras Pitayu-Nugroho, Mélanie Aubry, Kimberley Laband, Hélène Geoffroy, Thadshagine Ganeswaran, Audi Primadhanty, Julie C. Canman and Julien Dumont ()
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Laras Pitayu-Nugroho: Université Paris Cité, CNRS, Institut Jacques Monod
Mélanie Aubry: Université Paris Cité, CNRS, Institut Jacques Monod
Kimberley Laband: Université Paris Cité, CNRS, Institut Jacques Monod
Hélène Geoffroy: Université Paris Cité, CNRS, Institut Jacques Monod
Thadshagine Ganeswaran: Université Paris Cité, CNRS, Institut Jacques Monod
Audi Primadhanty: Universitat Politècnica de Catalunya
Julie C. Canman: Columbia University Irving Medical Center; Department of Pathology and Cell Biology
Julien Dumont: Université Paris Cité, CNRS, Institut Jacques Monod

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract During cell division, chromosome congression to the spindle center, their orientation along the spindle long axis and alignment at the metaphase plate depend on interactions between spindle microtubules and kinetochores, and are pre-requisite for chromosome bi-orientation and accurate segregation. How these successive phases are controlled during oocyte meiosis remains elusive. Here we provide 4D live imaging during the first meiotic division in C. elegans oocytes with wild-type or disrupted kinetochore protein function. We show that, unlike in monocentric organisms, holocentric chromosome bi-orientation is not strictly required for accurate chromosome segregation. Instead, we propose a model in which initial kinetochore-localized BHC module (comprised of BUB-1Bub1, HCP-1/2CENP-F and CLS-2CLASP)-dependent pushing acts redundantly with Ndc80 complex-mediated pulling for accurate chromosome segregation in meiosis. In absence of both mechanisms, homologous chromosomes tend to co-segregate in anaphase, especially when initially mis-oriented. Our results highlight how different kinetochore components cooperate to promote accurate holocentric chromosome segregation in oocytes of C. elegans.

Date: 2023
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DOI: 10.1038/s41467-023-39702-z

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