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Related Concept Videos

Euchromatin01:01

Euchromatin

7.0K
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...
7.0K
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.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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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Heterochromatin02:38

Heterochromatin

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Chromatin Packaging01:32

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, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
16.8K
Chromosome Structure02:40

Chromosome Structure

22.9K
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.
Telomeres consist of non-coding repetitive nucleotide...
22.9K

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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Is euchromatin really open in the cell?

Kazuhiro Maeshima1, Shiori Iida1, Masa A Shimazoe1

  • 1Genome Dynamics Laboratory, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan; Graduate Institute for Advanced Studies, SOKENDAI, Mishima, Shizuoka 411-8540, Japan.

Trends in Cell Biology
|June 29, 2023
PubMed
Summary
This summary is machine-generated.

Euchromatin, long considered open, is actually condensed and liquid-like in higher eukaryotic cells. This finding challenges textbook models and highlights condensed chromatin as the default state, impacting genome function.

Keywords:
chromatincondensed chromatin domaineuchromatingene expressionliquid-like propertynucleosome

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cell Biology

Background:

  • Genomic DNA is organized into nucleosomes, forming chromatin domains in eukaryotic cells.
  • Traditional models classify chromatin into open euchromatin and condensed heterochromatin.
  • The physical state of euchromatin in vivo has been debated.

Purpose of the Study:

  • To investigate the structural organization of euchromatin in higher eukaryotic cells.
  • To challenge the conventional view of euchromatin as an open chromatin state.
  • To explore the functional implications of euchromatin's organization on genome functions.

Main Methods:

  • Genomic studies
  • Advanced imaging techniques

Main Results:

  • Euchromatin is revealed to exist as condensed, liquid-like domains.
  • Condensed chromatin appears to be the predominant, default state in higher eukaryotes.
  • This challenges the established dichotomy of chromatin structure.

Conclusions:

  • The textbook model of euchromatin as 'open' is an oversimplification.
  • Euchromatin's condensed, liquid-like organization is crucial for genome function.
  • This revised understanding impacts our view of chromatin dynamics and regulation.