Influence of cell geometry on division-plane positioning.

Influence of cell geometry on division-plane positioning.
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DOI:
10.1016/j.cell.2011.01.016
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发表时间:
2011-02-04
期刊:
影响因子:
64.5
通讯作者:
Chang F
Chang F
中科院分区:
生物学1区
文献类型:
--
作者:
Minc N;Burgess D;Chang F

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细胞的空间组织取决于它们感知自身形状和大小的能力。在这里,我们研究细胞形状如何影响细胞核、纺锤体和随后的细胞分裂平面的定位。为了以系统的方式操纵几何参数,我们将单个海胆卵放入具有定义几何形状(例如三角形、矩形和椭圆形)的微型 PDMS 室中。在每种形状中,细胞核都位于质心,并被微管沿着有丝分裂维持的轴拉伸,并预测未来的分裂平面。我们开发了一个简单的计算模型,假设微管通过探测细胞空间来感知细胞几何形状,并通过施加与微管长度成比例的拉力来定向细胞核。该模型定量预测各种细胞形状(甚至在多细胞环境中)的分裂轴方向概率,并提供长度依赖性微管力的缩放指数。
The spatial organization of cells depends on their ability to sense their own shape and size. Here, we investigate how cell shape affects the positioning of the nucleus, spindle and subsequent cell division plane. To manipulate geometrical parameters in a systematic manner, we place individual sea urchin eggs into micro-fabricated PDMS chambers of defined geometry (e.g. triangles, rectangles and ellipses). In each shape, the nucleus is positioned at the center of mass and is stretched by microtubules along an axis maintained through mitosis and predictive of the future division plane. We develop a simple computational model that posits that microtubules sense cell geometry by probing cellular space and orient the nucleus by exerting pulling forces that scale to microtubule length. This model quantitatively predicts division axis orientation probability for a wide variety of cell shapes, even in multi-cellular contexts, and provides scaling exponents for length dependent microtubule forces.
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