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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...

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...

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...

The Mitotic Spindle

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...

The Mitotic Spindle

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 15, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Published on: August 13, 2016

Mitotic force generators and chromosome segregation.

Gul Civelekoglu-Scholey¹, Jonathan M Scholey

¹Department of Molecular and Cell Biology, University of California at Davis, 149 Briggs Hall, One Shields Avenue, Davis, CA 95616, USA.

Cellular and Molecular Life Sciences : CMLS

|March 12, 2010

Summary

The mitotic spindle generates forces using microtubules and motors for chromosome movement. Mathematical modeling aids understanding of chromosome motility and spindle elongation during cell division.

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Live Cell Imaging of Chromosome Segregation During Mitosis

Live Cell Imaging of Chromosome Segregation During Mitosis

Published on: March 14, 2018

Related Experiment Videos

Last Updated: Jun 15, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Published on: August 13, 2016

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Published on: May 10, 2022

Live Cell Imaging of Chromosome Segregation During Mitosis

Live Cell Imaging of Chromosome Segregation During Mitosis

Published on: March 14, 2018

Area of Science:

Cell Biology
Biophysics
Molecular Biology

Background:

The mitotic spindle is crucial for cell division, orchestrating chromosome movements.
Dynamic microtubules and molecular motors generate pico-Newton forces essential for mitosis.

Purpose of the Study:

To explore the biophysical and molecular mechanisms of force generation for chromosome movements within the mitotic spindle.
To discuss the role of mathematical modeling in understanding anaphase A and B in the Drosophila embryo mitotic spindle.

Main Methods:

Review of biophysical and molecular principles of spindle force generation.
Analysis of chromosome-to-pole motility (anaphase A) and spindle elongation (anaphase B).
Integration of experimental data with mathematical modeling approaches.

Main Results:

Microtubule dynamics and motor proteins are key to generating forces for chromosome segregation.
Mathematical models can elucidate the complex mechanics of chromosome movement and spindle dynamics.
The Drosophila embryo provides a model system for studying these fundamental mitotic processes.

Conclusions:

Understanding the biophysics of mitotic spindles is essential for comprehending cell division.
Mathematical modeling offers valuable insights into the mechanisms driving chromosome motility and spindle elongation.
Further research combining experimental and computational methods will advance our knowledge of mitosis.