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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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Euchromatin01:01

Euchromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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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.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
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Related Experiment Video

Updated: Aug 20, 2025

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Published on: March 3, 2016

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Centromere Chromatin Dynamics at a Glance.

Shivangi Shukla1, Ashutosh Kumar1

  • 1NMR-Based Structural Biology Lab, Lab No. 606, Department of Bioscience and Bioengineering, Indian Institute of Technology, Mumbai 400076, India.

Epigenomes
|November 22, 2022
PubMed
Summary
This summary is machine-generated.

The centromere

Keywords:
CENP-AH2A.ZPTMcentromereheterochromatinkinetochore

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Area of Science:

  • Cell Biology
  • Epigenetics
  • Molecular Biology

Background:

  • The centromere is a critical DNA locus for chromosome segregation during cell division.
  • Kinetochore assembly at the centromere is essential for accurate chromosome partitioning.
  • Centromere identity is epigenetically regulated, involving CENP-A, chromatin organization, and histone modifications.

Purpose of the Study:

  • To review the factors contributing to centromeric chromatin organization.
  • To elucidate the roles of CENP-A, histone modifications, and H2A.Z in centromere structure and function.

Main Methods:

  • This review synthesizes existing research on centromere structure and function.
  • Focuses on epigenetic mechanisms defining centromere identity.
  • Examines the interplay of CENP-A, H2A.Z, and post-translational modifications.

Main Results:

  • CENP-A nucleosomes define the centromere core and influence chromatin structure.
  • Post-translational modifications of CENP-A nucleosomes add regulatory layers.
  • H2A.Z is involved in heterochromatin formation in regions flanking the centromere.

Conclusions:

  • Centromeric chromatin organization is a complex interplay of CENP-A, histone variants, and modifications.
  • These factors collectively ensure faithful chromosome segregation.
  • Understanding centromere regulation is key to comprehending cell division fidelity.