Regional variation of microtubule flux reveals microtubule organization in the metaphase meiotic spindle.

Regional variation of microtubule flux reveals microtubule organization in the metaphase meiotic spindle.
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DOI:
10.1083/jcb.200801105
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发表时间:
2008-08-25
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Danuser G
Danuser G
中科院分区:
其他
文献类型:
--
作者:
Yang G;Cameron LA;Maddox PS;Salmon ED;Danuser G

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Continuous poleward movement of tubulin is a hallmark of metaphase spindle dynamics in higher eukaryotic cells and is essential for stable spindle architecture and reliable chromosome segregation. We use quantitative fluorescent speckle microscopy to map with high resolution the spatial organization of microtubule flux in Xenopus laevis egg extract meiotic spindles. We find that the flux velocity decreases near spindle poles by ∼20%. The regional variation is independent of functional kinetochores and centrosomes and is suppressed by inhibition of dynein/dynactin, kinesin-5, or both. Statistical analysis reveals that tubulin flows in two distinct velocity modes. We propose an association of these modes with two architecturally distinct yet spatially overlapping and dynamically cross-linked arrays of microtubules: focused polar microtubule arrays of a uniform polarity and slower flux velocities are interconnected by a dense barrel-like microtubule array of antiparallel polarities and faster flux velocities.
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