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Forces Acting on Chromosomes

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...

The Spindle Assembly Checkpoint

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 Checkpoint

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...

Anaphase A and B

Anaphase A and B

Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...

Spindle Assembly

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...

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Related Experiment Video

Updated: Jun 16, 2026

Live Cell Imaging of Chromosome Segregation During Mitosis

Live Cell Imaging of Chromosome Segregation During Mitosis

Published on: March 14, 2018

Towards building a chromosome segregation machine.

Kerry Bloom¹, Ajit Joglekar

¹Department of Biology, 622 Fordham Hall, CB3280, University of North Carolina at Chapel Hill, North Carolina 27599, USA. kerry_bloom@unc.edu

|January 30, 2010

Summary

This summary is machine-generated.

All organisms must package and segregate their DNA during cell division. Understanding these complex genome packaging and segregation mechanisms is crucial, as they vary significantly across species.

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Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae

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Published on: October 11, 2022

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Last Updated: Jun 16, 2026

Live Cell Imaging of Chromosome Segregation During Mitosis

Live Cell Imaging of Chromosome Segregation During Mitosis

Published on: March 14, 2018

Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae

Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae

Published on: October 11, 2022

Area of Science:

Molecular Biology
Genetics
Cell Biology

Background:

Cell division requires the accurate replication, packaging, and segregation of large amounts of DNA.
While DNA replication mechanisms are well-understood, genome packaging and segregation processes remain less clear.
These processes are fundamental for all life, from bacteria to humans.

Purpose of the Study:

To explore the complex mechanisms of DNA packaging and segregation during cell division.
To highlight the variability of these mechanisms across different organisms.
To underscore the ongoing research into understanding genome organization.

Main Methods:

Comparative genomics analysis to identify conserved and variable mechanisms.
Molecular biology techniques to study DNA-protein interactions.
Cellular imaging to visualize genome organization during division.

Main Results:

Identified diverse strategies employed by organisms for DNA packaging and segregation.
Highlighted key protein families involved in genome organization.
Demonstrated significant differences in mechanisms even between closely related species.

Conclusions:

Genome packaging and segregation are complex, highly variable processes essential for cell division.
Further research is needed to fully elucidate the diverse molecular mechanisms involved.
Understanding these mechanisms is critical for fields ranging from developmental biology to disease research.