Article Dans Une Revue eLife Année : 2018

Condensin controls cellular RNA levels through the accurate segregation of chromosomes instead of directly regulating transcription

Résumé

The localization of condensin along chromosomes is crucial for their accurate segregation in anaphase. Condensin is enriched at telomeres but how and for what purpose had remained elusive. Here, we show that fission yeast condensin accumulates at telomere repeats through the balancing acts of Taz1, a core component of the shelterin complex that ensures telomeric functions, and Mit1, a nucleosome remodeler associated with shelterin. We further show that condensin takes part in sister-telomere separation in anaphase, and that this event can be uncoupled from the prior separation of chromosome arms, implying a telomere-specific separation mechanism. Consistent with a cis-acting process, increasing or decreasing condensin occupancy specifically at telomeres modifies accordingly the efficiency of their separation in anaphase. Genetic evidence suggests that condensin promotes sister-telomere separation by counteracting cohesin. Thus, our results reveal a shelterin-based mechanism that enriches condensin at telomeres to drive in cis their separation during mitosis.

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hal-02347214 , version 1 (11-12-2024)

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Léonard Colin, Celine Reyes, Julien Berthezene, Laetitia Maestroni, Laurent Modolo, et al.. Condensin controls cellular RNA levels through the accurate segregation of chromosomes instead of directly regulating transcription. eLife, 2018, 7, ⟨10.7554/eLife.38517⟩. ⟨hal-02347214⟩
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