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Related Concept Videos

Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
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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.
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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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Chromatin Packaging02:21

Chromatin Packaging

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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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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Study of chromatin diminution in <i>Cyclopskolensis</i> (Copepoda, Crustacea) by radiobiological methods.

Comparative cytogenetics·2021
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Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis
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Chromatin diminution as a tool to study some biological problems.

Andrey Grishanin1,2

  • 1Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Yaroslavl Prov., Russia Russian Academy of Sciences Borok Russia.

Comparative Cytogenetics
|February 19, 2024
PubMed
Summary

Chromatin diminution offers insights into genome reduction and species adaptation. Studying this process in *Cyclops kolensis* can reveal mechanisms of chromosome transformation and speciation.

Keywords:
C-value enigmadifferentiationevolutiongenome reorganizationrecombinationspeciation

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Developmental Biology

Background:

  • Chromatin diminution is a poorly understood phenomenon with hypothesized roles in biological problems.
  • The C-value enigma, concerning variations in genome size, remains a significant question in genetics.

Purpose of the Study:

  • To explore the biological significance of chromatin diminution.
  • To analyze its role in the C-value enigma and genome reduction.
  • To propose *Cyclops kolensis* as a model organism for studying chromatin diminution.

Main Methods:

  • Review of existing hypotheses on chromatin diminution.
  • Analysis of chromatin diminution in relation to genome size and recombination.
  • Consideration of chromatin diminution as a mechanism for species adaptation and speciation.

Main Results:

  • Chromatin diminution is proposed as a universal genome reduction mechanism.
  • It may reduce recombination, leading to species specialization and adaptation.
  • Chromatin diminution in copepods represents irreversible cell differentiation during development.

Conclusions:

  • Chromatin diminution provides a pathway for understanding genome reduction and adaptation.
  • *Cyclops kolensis* is a suitable model for investigating chromosome and nuclear structure changes.
  • The process is linked to cell differentiation, speciation, and the C-value enigma.