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Updated: Jun 15, 2026
10:52
Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
Published on: August 13, 2016
Centrobin regulates the assembly of functional mitotic spindles
J M Jeffery1, A J Urquhart, V N Subramaniam
1Signal Transduction Laboratory, Cancer and Cell Biology Division, Queensland Institute of Medical Research, Brisbane, Queensland, Australia.
Oncogene
|March 2, 2010
Summary
Centrobin protein is essential for maintaining centrosome integrity and proper spindle assembly during cell division. Depleting Centrobin causes spindle defects, mitotic arrest, and apoptosis due to failed spindle checkpoint silencing.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- The spindle apparatus is vital for accurate chromosome segregation and tumor suppression.
- Centrobin is a centrosomal protein involved in microtubule stabilization.
Purpose of the Study:
- To investigate the role of Centrobin in centrosome integrity and spindle assembly.
- To characterize the consequences of Centrobin depletion on cell division.
Main Methods:
- Functional characterization of Centrobin-depleted cells.
- Live cell imaging to observe mitotic progression and cell death.
- Immunofluorescence staining for centrosome and spindle checkpoint proteins.
- Assessment of microtubule stability and kinetochore-pair distance.
Main Results:
- Centrobin depletion leads to spindle abnormalities, including unfocused poles and mini spindles.
- Cells lacking Centrobin exhibit mitotic arrest due to failed spindle checkpoint silencing, evidenced by BubR1 staining.
- Loss of centrosome anchoring to the mitotic spindle and reduced microtubule stability were observed.
- Centrobin is required for proper microtubule-kinetochore attachments and functional spindle formation.
Conclusions:
- Centrobin is crucial for maintaining centrosome integrity and its proper anchoring to the mitotic spindle.
- This anchoring is essential for microtubule stability, kinetochore attachment, and the formation of a functional spindle apparatus.
- These findings highlight Centrobin's role in ensuring accurate chromosome segregation and its implications for tumor suppression.
Related Concept Videos
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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
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In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
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The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
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