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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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.
X-chromosome...
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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...

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A Method to Study de novo Formation of Chromatin Domains
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Published on: August 23, 2019

Polycomb complexes and epigenetic states.

Yuri B Schwartz1, Vincenzo Pirrotta

  • 1Department of Molecular Biology and Biochemistry, Rutgers University, 604 Allison Road, Piscataway, NJ 08854, USA.

Current Opinion in Cell Biology
|April 29, 2008
PubMed
Summary
This summary is machine-generated.

Polycomb Group (PcG) complexes dynamically regulate gene expression during development. Recent studies reveal their role in programming the genome, controlling gene repression and reactivation crucial for cellular functions and organism development.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Developmental Biology

Background:

  • Polycomb Group (PcG) complexes are key epigenetic regulators.
  • Their role in genome programming and development is under active investigation.
  • Classical models depicted PcG complexes as maintaining a static repressed chromatin state.

Purpose of the Study:

  • To review recent advances in understanding PcG complex function.
  • To highlight the dynamic role of PcG complexes in genome programming.
  • To emphasize the importance of PcG-mediated repression-derepression balance in development.

Main Methods:

  • Genome-wide analyses of PcG complex targets.
  • Review of recent literature on PcG complex mechanisms.
  • Analysis of gene regulation during development and differentiation.

Main Results:

  • PcG complexes control a vast number of genes involved in cellular functions and development.
  • PcG complexes exhibit a dynamic regulatory role, not a static one.
  • PcG target genes can be repressed, reactivated, or exist in intermediate states.

Conclusions:

  • PcG complexes play a dynamic role in programming the genome.
  • Understanding the balance between PcG-mediated repression and derepression is critical for development and differentiation.
  • Advances in genome-wide analyses are crucial for elucidating PcG complex functions.