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Related Concept Videos

Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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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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Heterochromatin02:38

Heterochromatin

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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.
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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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)
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Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis
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Dynamic Chromatin Regulation from a Single Molecule Perspective.

Beat Fierz1

  • 1Laboratory of Biophysical Chemistry of Macromolecules, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne, Switzerland.

ACS Chemical Biology
|November 14, 2015
PubMed
Summary
This summary is machine-generated.

Single-molecule methods offer new insights into dynamic chromatin regulation. These techniques reveal how gene expression patterns become stable and heritable, aiding in understanding inheritance and disease.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • Chromatin regulatory processes are inherently dynamic and stochastic, yet can result in stable, inheritable gene expression changes.
  • Understanding these processes is crucial for insights into gene regulation, epigenetic inheritance, lineage determination, and disease-related therapies.
  • While key molecular players are identified, the dynamic interplay between proteins, transcription factors, and chromatin is less understood.

Purpose of the Study:

  • To review recent applications of single-molecule methods in investigating fundamental chromatin regulatory processes.
  • To highlight how single-molecule approaches provide a molecular view of dynamic chromatin regulation.

Main Methods:

  • Utilizes single-molecule approaches with highly defined chromatin substrates in vitro.
  • Employs direct observation of complex regulatory processes in vivo.
  • Reviews related techniques that complement single-molecule studies.

Main Results:

  • Single-molecule methods provide unprecedented molecular resolution of chromatin dynamics.
  • These techniques enable the study of interactions between regulatory proteins, transcription factors, and chromatin.
  • Advances in single-molecule techniques are opening new avenues for understanding gene regulation at a fundamental level.

Conclusions:

  • Single-molecule approaches are essential for dissecting the dynamic and stochastic nature of chromatin regulation.
  • This methodology offers a powerful means to understand epigenetic inheritance and gene expression stability.
  • Further application of these techniques promises significant advancements in fundamental biology and therapeutic strategies.