The Rabl chromosome configuration masks a kinetochore reassembly mechanism in yeast mitosis |
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Authors: | Alberto Jimnez-Martín Alberto Pineda-Santaella Jesús Pinto-Cruz Daniel Len-Perin Sabas García-Snchez David Delgado-Gestoso Laura Marín-Toral Alfonso Fernndez-lvarez |
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Institution: | University of North Carolina, Chapel Hill;aAndalusian Center for Developmental Biology (CABD); Consejo Superior de Investigaciones Científicas, Universidad Pablo de Olavide and Junta de Andalucía, 41013 Seville, Spain;bInstituto de Biología Funcional y Genómica (IBFG); Consejo Superior de Investigaciones Científicas and Universidad de Salamanca, 37007 Salamanca, Spain |
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Abstract: | During cell cycle progression in metazoans, the kinetochore is assembled at mitotic onset and disassembled during mitotic exit. Once assembled, the kinetochore complex attached to centromeres interacts directly with the spindle microtubules, the vehicle of chromosome segregation. This reassembly program is assumed to be absent in budding and fission yeast, because most kinetochore proteins are stably maintained at the centromeres throughout the entire cell cycle. Here, we show that the reassembly program of the outer kinetochore at mitotic onset is unexpectedly conserved in the fission yeast Schizosaccharomyces pombe. We identified this behavior by removing the Rabl chromosome configuration, in which centromeres are permanently associated with the nuclear envelope beneath the spindle pole body during interphase. In addition to having evolutionary implications for kinetochore reassembly, our results aid the understanding of the molecular processes responsible for kinetochore disassembly and assembly during mitotic entry. |
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