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Reconstitution of Mitotic ChromatidsIn Vitro

机译:重建有丝分裂染色体体外

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摘要

The mitotic chromosome, which is composed of a pair of sister chromatids, isa large macromolecular assembly that ensures faithful transmission of geneticinformation into daughter cells. Despite its fundamental importance, how anucleosome fiber is folded and assembled into a large-scale chromatid structureremains poorly understood. To address this question, we have establisheda biochemically tractable system in which mitotic chromatids can be reconstitutedin vitro by mixing a simple substrate (sperm nucleus) and a limitednumber of purified factors. The minimum set of required factors includes corehistones, three histone chaperones, topoisomerase II, and condensin I. In thisarticle, we describe a set of protocols for the preparation of key reagents andthe setup of reconstitution reactions. We believe that this classical approach ofbiochemical reconstitution will be of great help to dissect the mechanisms ofaction of individual factors during mitotic chromatid assembly and to assessthe contribution of nucleosome dynamics to this process from a fresh angle.
机译:由一对姐妹染色体组成的有丝分裂染色体,ISA大型大分子组件,可确保致力于遗传信息。尽管它的重要性是重要的,但如何将亚核糖纤维折叠并组装成大规模的染色体结构培育症,其难以理解的较差。为了解决这个问题,我们已经建立了生物化学易易易用的系统,其中通过混合简单的基材(精子核)和有金属纯化因子可以重构有偶联染色体。所需因素的最小集合包括核istone,三个组蛋白伴侣,拓扑异构酶II和凝结I.在本质上,我们描述了一组用于制备关键试剂和重构反应的设置的协议。我们认为,这种古典化学的重构方法将有很大的帮助,将各种因素的机制解剖有丝分裂染色体组装,并从新角度评估核小体动力学对该过程的贡献。

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