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4D Chromatin dynamics in cycling cells

机译:循环细胞中的4D染色质动力学

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This live cell study of chromatin dynamics in four dimensions (space and time) in cycling human cells provides direct evidence for three hypotheses first proposed by Theodor Boveri in seminal studies of fixed blastomeres from Parascaris equorum embryos: (I) Chromosome territory (CT) arrangements are stably maintained during interphase. (II) Chromosome proximity patterns change profoundly during prometaphase. (III) Similar CT proximity patterns in pairs of daughter nuclei reflect symmetrical chromosomal movements during anaphase and telophase, but differ substantially from the arrangement in mother cell nucleus. Hypothesis I could be confirmed for the majority of interphase cells. A minority, however, showed complex, rotational movements of CT assemblies with large-scale changes of CT proximity patterns, while radial nuclear arrangements were maintained. A new model of chromatin dynamics is proposed. It suggests that long-range DNA-DNA interactions in cell nuclei may depend on a combination of rotational CT movements and locally constrained chromatin movements.
机译:这项关于循环人体细胞在四个维度(空间和时间)上的染色质动力学的活细胞研究为Theodor Boveri首先提出的三个假说提供了直接证据,这三个假说是在对拟南芥(Pecarscaris equorum)胚胎的固定卵裂球的开创性研究中提出的:(I)染色体区域(CT)排列在相间保持稳定。 (II)在接近中期,染色体的接近模式发生了深刻的变化。 (III)子核对中相似的CT邻近模式反映了后期和末期对称的染色体运动,但与母细胞核的排列有很大不同。可以证实大多数中间相细胞的假说I。然而,少数人表现出CT组件复杂的旋转运动,同时CT邻近模式发生了大规模变化,同时保持了放射状核排列。提出了染色质动力学的新模型。这表明细胞核中的长距离DNA-DNA相互作用可能取决于旋转CT运动和局部约束染色质运动的组合。

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