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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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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.
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Cohesins02:20

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Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
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Anaphase A and B01:39

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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.
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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.
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Related Experiment Video

Updated: Apr 23, 2026

A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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Centromeric heterochromatin: the primordial segregation machine.

Kerry S Bloom1

  • 1Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599-3280;

Annual Review of Genetics
|September 25, 2014
PubMed
Summary

Centromeres act as molecular springs, using specialized DNA and proteins to ensure accurate chromosome separation during cell division. This conserved mechanism maintains kinetochore distance, crucial for faithful cell replication.

Keywords:
DNA mechanicscentromerechromosome segregationheterochromatinmolecular springs

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Centromeres are heterochromatic regions essential for kinetochore assembly.
  • Key components include histone modifications, CENP-A, cohesin, condensin, and topoisomerase II.
  • Centromere DNA size varies greatly across species, from yeast to humans.

Purpose of the Study:

  • To explore the physical properties of centromeric DNA.
  • To understand how centromeres function as molecular springs.
  • To elucidate the contribution of centromeres to chromosome segregation fidelity.

Main Methods:

  • Review of existing literature on centromere structure and function.
  • Analysis of biophysical properties of DNA.
  • Exploration of conserved mechanisms in chromosome segregation.

Main Results:

  • Sister kinetochore distance is conserved at approximately 1 μm across species.
  • Centromeres function as molecular springs, resisting extensional forces during mitosis.
  • Specific DNA properties and protein enrichments contribute to this function.

Conclusions:

  • The molecular spring function of centromeres is vital for accurate chromosome segregation.
  • Understanding DNA's physical properties is key to comprehending centromere mechanics.
  • Conserved centromere properties ensure faithful inheritance of genetic material.