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Related Concept Videos

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...
Nucleosome Remodeling02:54

Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
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...
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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 DNA...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...

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Updated: Jun 3, 2026

In Situ Nucleosome Assembly for Single-Molecule Correlative Force and Fluorescence Microscopy
05:58

In Situ Nucleosome Assembly for Single-Molecule Correlative Force and Fluorescence Microscopy

Published on: September 6, 2024

RNA interference and heterochromatin assembly.

Tom Volpe1, Robert A Martienssen

  • 1Department of Molecular and Cellular Biology, Northwestern University, Chicago, Illinois 60611, USA.

Cold Spring Harbor Perspectives in Biology
|March 29, 2011
PubMed
Summary
This summary is machine-generated.

RNA interference guides gene silencing in eukaryotes by processing small RNAs to recruit modifying enzymes. This mechanism, crucial for heterochromatin formation, appears conserved across species, including mammals.

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Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands

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Last Updated: Jun 3, 2026

In Situ Nucleosome Assembly for Single-Molecule Correlative Force and Fluorescence Microscopy
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In Situ Nucleosome Assembly for Single-Molecule Correlative Force and Fluorescence Microscopy

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Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands
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Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands

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Area of Science:

  • Epigenetics and Gene Regulation
  • Molecular Biology
  • Genetics

Background:

  • Histone and DNA modifications silence genes in heterochromatic regions.
  • Mechanisms guiding these modifications during the cell cycle remain unclear.
  • Heterochromatin silences pericentromeric repeats and transposable elements.

Purpose of the Study:

  • To elucidate the mechanisms responsible for guiding epigenetic modifications to heterochromatin.
  • To understand the role of RNA interference in heterochromatin formation and gene silencing.

Main Methods:

  • Investigated the role of RNA interference (RNAi) in heterochromatic gene silencing.
  • Analyzed the processing of small RNAs derived from heterochromatic transcription.
  • Examined the recruitment of enzymes for histone and DNA modifications.

Main Results:

  • RNA interference utilizes heterochromatic transcription to generate small RNAs.
  • These small RNAs are essential for recruiting enzymes that modify histones and DNA.
  • This process contributes to the stable silencing of heterochromatic sequences.

Conclusions:

  • RNA interference is a key mechanism for establishing and maintaining heterochromatin.
  • The identified mechanisms are well-understood in fission yeast and plants.
  • Emerging evidence suggests these heterochromatin formation pathways are conserved in mammalian germline cells.