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Related Concept Videos

The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Spindle Assembly02:50

Spindle Assembly

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...
Spindle Assembly02:50

Spindle Assembly

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...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
The Mitotic Spindle02:27

The Mitotic Spindle

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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Related Experiment Video

Updated: Jun 23, 2026

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
10:09

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

Published on: September 13, 2022

The RZZ complex and the spindle assembly checkpoint.

Yujian Lu1, Zhenyu Wang, Liang Ge

  • 1MOE Key Laboratory of Arid and Grassland Ecology, Institute of Cell Biology, Life Science School, Lanzhou University, Lanzhou, PR China.

Cell Structure and Function
|May 8, 2009
PubMed
Summary
This summary is machine-generated.

The protein Rod is essential for accurate chromosome segregation during cell division. Mutations in Rod disrupt the spindle assembly checkpoint, leading to errors in chromosome distribution.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • The protein Rod is conserved across various organisms and plays a role in cell division.
  • Rod localizes to kinetochores and spindle microtubules during mitosis and meiosis.
  • Proper chromosome segregation is crucial for preventing aneuploidy.

Purpose of the Study:

  • To investigate the role of the protein Rod in chromosome segregation and the spindle assembly checkpoint.
  • To understand the consequences of rod mutations on cell division.
  • To elucidate the involvement of Rod in the RZZ complex and its function.

Main Methods:

  • Analysis of rod mutations in various organisms.
  • Microscopic observation of chromosome segregation during mitosis and meiosis.
  • Biochemical assays to study protein complex formation.

Main Results:

  • Rod mutations lead to lagging chromosomes and unequal chromosome distribution during anaphase.
  • Rod is a key component of the mitotic checkpoint.
  • Rod forms the RZZ complex with Zw10 and Zwilch, crucial for spindle assembly checkpoint function.

Conclusions:

  • The protein Rod is indispensable for accurate chromosome segregation in both mitosis and meiosis.
  • Rod's function in the RZZ complex is vital for maintaining a robust spindle assembly checkpoint.
  • Disruptions in Rod function can lead to chromosomal instability.