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In vitro centromere and kinetochore assembly on defined chromatin templates

During cell division, chromosomes are segregated to nascent daughter cells by attaching to the microtubules of the mitotic spindle through the kinetochore. Kinetochores are assembled on a specialized chromatin domain called the centromere, which is characterized by the replacement of nucleosomal his...

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1. Verfasser: Guse, Annika (VerfasserIn)
Dokumenttyp: Article (Journal) Editorial
Sprache:Englisch
Veröffentlicht: 18 August 2011
In: Nature
Year: 2011, Jahrgang: 477, Heft: 7364, Pages: 354-358
ISSN:1476-4687
DOI:10.1038/nature10379
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1038/nature10379
Verlag, kostenfrei, Volltext: https://www.nature.com/nature/journal/v477/n7364/full/nature10379.html
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Verfasserangaben:Annika Guse, Christopher W. Carroll, Ben Moree, Colin J. Fuller, Aaron F. Straight

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520 |a During cell division, chromosomes are segregated to nascent daughter cells by attaching to the microtubules of the mitotic spindle through the kinetochore. Kinetochores are assembled on a specialized chromatin domain called the centromere, which is characterized by the replacement of nucleosomal histone H3 with the histone H3 variant centromere protein A (CENP-A). CENP-A is essential for centromere and kinetochore formation in all eukaryotes but it is unknown how CENP-A chromatin directs centromere and kinetochore assembly. Here we generate synthetic CENP-A chromatin that recapitulates essential steps of centromere and kinetochore assembly in vitro. We show that reconstituted CENP-A chromatin when added to cell-free extracts is sufficient for the assembly of centromere and kinetochore proteins, microtubule binding and stabilization, and mitotic checkpoint function. Using chromatin assembled from histone H3/CENP-A chimaeras, we demonstrate that the conserved carboxy terminus of CENP-A is necessary and sufficient for centromere and kinetochore protein recruitment and function but that the CENP-A targeting domain—required for new CENP-A histone assembly—is not. These data show that two of the primary requirements for accurate chromosome segregation, the assembly of the kinetochore and the propagation of CENP-A chromatin, are specified by different elements in the CENP-A histone. Our unique cell-free system enables complete control and manipulation of the chromatin substrate and thus presents a powerful tool to study centromere and kinetochore assembly. 
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