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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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Inheritance of Chromatin Structures03:17

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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...
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Chromatin Position Affects Gene Expression02:35

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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. 
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Updated: Dec 13, 2025

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

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Epigenetics as an Evolutionary Tool for Centromere Flexibility.

Laura Leo1, Marcella Marchetti1, Simona Giunta1,2

  • 1Istituto Pasteur Italia, Dipartimento di Biologia e Biotecnologie "Charles Darwin", "Sapienza" University of Rome, 00185 Rome, Italy.

Genes
|July 26, 2020
PubMed
Summary
This summary is machine-generated.

Centromeres maintain chromosome stability through epigenetic adaptability, forming neocentromeres and holocentromeres. These mechanisms ensure faithful genome inheritance despite structural variations.

Keywords:
CENP-Acentromerecentromere evolutionholocentromereneocentromererepetitive sequences

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Area of Science:

  • Cell Biology
  • Genetics
  • Epigenetics

Background:

  • Centromeres are crucial for chromosome segregation during cell division.
  • Alterations in centromere structure or function lead to aneuploidies and chromosomal aberrations.
  • Centromeres possess inherent flexibility and tolerance mechanisms to maintain function under stress.

Purpose of the Study:

  • To review epigenetic mechanisms enabling centromere adaptability.
  • To discuss neocentromere formation and holocentromere evolutionary significance.
  • To highlight how diverse centromere structures ensure genome stability and inheritance.

Main Methods:

  • Literature review of epigenetic mechanisms.
  • Analysis of neocentromere formation models.
  • Discussion of holocentromere evolution in specific organisms.

Main Results:

  • Epigenetic mechanisms are key to centromere adaptability and functional stability.
  • Neocentromere formation triggers and mechanisms remain areas of active research.
  • Holocentromeres demonstrate evolutionary strategies for chromosome segregation in certain species.

Conclusions:

  • Centromeres balance genome stability and adaptability through epigenetic regulation.
  • Diverse centromere structures, including neocentromeres and holocentromeres, ensure faithful chromosome segregation.
  • Understanding centromere adaptability is vital for comprehending genome inheritance and organismal health.