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Related Concept Videos

Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Forces Acting on Chromosomes02:11

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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. 
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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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The Mitotic Spindle02:27

The Mitotic Spindle

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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.
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Chromosome Structure02:40

Chromosome Structure

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Spindle Assembly

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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.
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Related Experiment Video

Updated: Jan 17, 2026

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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An electrostatic repulsion model of centromere organisation.

Caelan Bell1,2,3, Lifeng Chen3,4, M Julia Maristany3,5,6

  • 1Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna BioCenter, 1030 Vienna, Austria.

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Summary

Centromere positioning on mitotic chromosomes relies on electrostatic repulsion between centromeric proteins and chromatin, not chromosome folding. This mechanism drives centromere surface localization for accurate genome segregation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Centromeres precisely localize to the chromatin surface during cell division.
  • This positioning is crucial for kinetochore-microtubule interactions and genome segregation.
  • The physical principles governing centromere surface localization remain largely unknown.

Purpose of the Study:

  • To elucidate the physical principles driving centromere surface positioning on mitotic chromosomes.
  • To investigate the roles of centromere-associated proteins and chromatin structure in this process.

Main Methods:

  • Cellular perturbations
  • Biochemical reconstitution assays
  • Multiscale molecular dynamics simulations
  • Tethering of synthetic charged proteins to chromatin

Main Results:

  • Centromere surface localization is driven by repulsion between condensed chromatin and centromere-associated proteins, including CENP-B.
  • This localization is independent of condensin-mediated loop extrusion and microtubule engagement.
  • Electrostatic repulsion, mediated by negatively charged proteins, is a key determinant of centromere surface positioning.
  • Centromere layering emerges from chromatin phase separation, not solely from folding patterns.

Conclusions:

  • Electrostatic repulsion dictates centromere surface localization on mitotic chromosomes.
  • This mechanism provides a general and programmable strategy for spatial organization of chromatin.
  • Findings reveal a novel principle of electrostatic polarity in organizing cellular structures.