A computational model predicts Xenopus meiotic spindle organization.

A computational model predicts Xenopus meiotic spindle organization.
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DOI:
10.1083/jcb.201006076
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发表时间:
2010-12-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nédélec F
Nédélec F
中科院分区:
其他
文献类型:
--
作者:
Loughlin R;Heald R;Nédélec F

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空间分散的成核和微管末端解体活性的负末端定向运输可以导致双极纺锤体组装。中期纺锤体是一个动态的双极结构,对染色体的正确分离至关重要,但微管(MT)如何在双极结构中组织仍然存在争议。为了探索MT组织沿着极-极轴,我们模拟减数分裂纺锤体组装在二维使用动态MT,MT交联力,和驱动蛋白-5样电机。形成的双极结构由反平行的磁通MT组成,但纺锤体极的形成需要添加NuMA样负端交联剂和MT解聚活性向负端的定向运输。动态不稳定性和负端解聚产生现实的MT寿命和截断的指数MT长度分布。保持模拟中MT的数量不变,我们探讨了两种不同的MT成核途径对纺锤体组织的影响。当整个纺锤体发生成核时,模拟定量再现了非洲爪蟾卵提取物中组装的减数分裂纺锤体的特征。
Spatially dispersed nucleation and minus end–directed transport of microtubule end disassembly activity can lead to bipolar spindle assembly. The metaphase spindle is a dynamic bipolar structure crucial for proper chromosome segregation, but how microtubules (MTs) are organized within the bipolar architecture remains controversial. To explore MT organization along the pole-to-pole axis, we simulated meiotic spindle assembly in two dimensions using dynamic MTs, a MT cross-linking force, and a kinesin-5–like motor. The bipolar structures that form consist of antiparallel fluxing MTs, but spindle pole formation requires the addition of a NuMA-like minus-end cross-linker and directed transport of MT depolymerization activity toward minus ends. Dynamic instability and minus-end depolymerization generate realistic MT lifetimes and a truncated exponential MT length distribution. Keeping the number of MTs in the simulation constant, we explored the influence of two different MT nucleation pathways on spindle organization. When nucleation occurs throughout the spindle, the simulation quantitatively reproduces features of meiotic spindles assembled in Xenopus egg extracts.
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