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Related Concept Videos

Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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 variants are also...
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
Heterochromatin02:38

Heterochromatin

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 9th...
Heterochromatin02:38

Heterochromatin

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 9th...
Euchromatin01:01

Euchromatin

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...
Euchromatin01:01

Euchromatin

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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Related Experiment Video

Updated: Jul 17, 2026

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
05:35

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Published on: March 3, 2016

Dynamic Centromeres Under Epigenetic Constraint.

Emma M Anderson1, Barbara G Mellone1

  • 1Department of Molecular and Cell Biology and Institute for Systems Genomics, University of Connecticut, Storrs, Connecticut, USA ;

Annual Review of Genetics
|July 15, 2026
PubMed
Summary

Centromeres, crucial for chromosome segregation, exhibit rapid evolution driven by DNA sequences and epigenetic factors. This review synthesizes how these elements generate diversity while maintaining essential function.

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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Area of Science:

  • Genetics and Epigenetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Centromeres are epigenetically defined chromosomal regions essential for faithful chromosome segregation.
  • Despite their critical function, centromeric DNA sequences evolve rapidly and undergo structural changes.
  • Understanding centromere organization is key to comprehending genome evolution and stability.

Purpose of the Study:

  • To synthesize current knowledge on centromere organization across diverse taxa.
  • To integrate recent advances from long-read sequencing and chromatin mapping.
  • To explore the evolutionary forces shaping centromere diversity and stability.

Main Methods:

  • Review of recent literature integrating long-read genome assemblies.
  • Analysis of high-resolution chromatin mapping data.
  • Examination of evolutionary mechanisms like molecular drive and meiotic conflict.

Main Results:

  • Centromere diversity arises from satellite repeats, transposable elements, molecular drive, and meiotic conflict.
  • DNA methylation and H3K9me3 heterochromatin stabilize centromeric domains and constrain CENP-A positioning.
  • These epigenetic marks influence centromere dynamics during drift, duplication, and de novo formation.

Conclusions:

  • Centromeres balance rapid evolutionary change with the necessity for stable chromosome segregation.
  • Epigenetic mechanisms play a critical role in maintaining centromere function amidst sequence turnover.
  • Centromere evolution is a dynamic process shaped by interplay between DNA sequence, epigenetics, and evolutionary pressures.