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Updated: Apr 29, 2026
Measurement of Microtubule Dynamics by Spinning Disk Microscopy in Monopolar Mitotic Spindles
Published on: November 15, 2019
An optimum rate of microtubule flux for error correction in metaphase spindle
Yao Wang1,2, Jie Wang1,2, Yu-Ru Liu1,2
1Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Abstract:
Accurate chromosome segregation requires efficient corrections of erroneous kinetochore-microtubule attachments during metaphase. However, the detailed mechanisms of how the erroneous attachments can be corrected in the metaphase spindle with the presence of microtubule poleward flux are unclear. To explore the mechanisms and understand the roles the flux plays in the error correction, here we study numerically the correction of various erroneous (merotelic, syntelic, and monotelic) attachments in the metaphase spindle exhibiting the flux. We show that with the effect of kinase Aurora B activity, the erroneous attachments can be corrected efficiently. In contrast, without the effect of Aurora B activity the erroneous attachments cannot be corrected efficiently. More interestingly, we find that an optimum rate of the microtubule poleward flux or an optimum amplitude of the kinetochore oscillation is present, which can result in both the efficient error correction and high mitotic fidelity.
Insights
Accurate chromosome segregation relies on correcting faulty kinetochore-microtubule attachments. This study reveals that Aurora B kinase activity and optimal microtubule flux are crucial for efficient error correction during metaphase.
Area of Science:
- Cell Biology
- Molecular Biology
- Biophysics
Background:
- Accurate chromosome segregation is vital for cell division and preventing aneuploidy.
- Kinetochore-microtubule attachments must be corrected during metaphase for proper segregation.
- The role of microtubule poleward flux in correcting erroneous attachments remains incompletely understood.
Purpose of the Study:
- To numerically investigate the mechanisms of correcting merotelic, syntelic, and monotelic attachments.
- To elucidate the role of microtubule poleward flux in erroneous attachment correction.
- To understand the influence of Aurora B kinase activity on error correction efficiency.
Main Methods:
- Numerical simulations of metaphase spindle dynamics.
- Modeling of kinetochore-microtubule attachments, including merotelic, syntelic, and monotelic types.
- Incorporation of microtubule poleward flux and Aurora B kinase activity into the models.
Main Results:
- Aurora B kinase activity significantly enhances the efficiency of correcting erroneous kinetochore-microtubule attachments.
- Without Aurora B activity, correction of erroneous attachments is inefficient.
- An optimal rate of microtubule poleward flux and kinetochore oscillation amplitude promote both efficient error correction and high mitotic fidelity.
Conclusions:
- Aurora B kinase is essential for robust correction of erroneous kinetochore-microtubule attachments during metaphase.
- Microtubule poleward flux and kinetochore oscillation dynamics play critical roles in ensuring mitotic fidelity.
- The findings provide insights into the mechanisms maintaining chromosomal stability during cell division.
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