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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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Spreading of Chromatin Modifications02:25

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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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Nucleosome Remodeling02:54

Nucleosome Remodeling

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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...
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Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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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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Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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Updated: Oct 18, 2025

Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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Approaches to Study Native Chromatin-Modifying Complex Activities and Functions.

Maxime Galloy1,2, Catherine Lachance1,2, Xue Cheng1,2

  • 1St-Patrick Research Group in Basic Oncology, Oncology Division, Centre Hospitalier Universitaire (CHU) de Québec-Université Laval Research Center, Québec, QC, Canada.

Frontiers in Cell and Developmental Biology
|October 4, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed new methods to purify native chromatin modifiers and study their functions. These techniques enable a deeper understanding of epigenetic regulation and genome stability in eukaryotic cells.

Keywords:
chromatinhistone modificationnative protein complexesnuclear protein depletionrecombinant nucleosomes

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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Histone modifications are key to regulating genome expression and stability.
  • Multisubunit complexes mediate these modifications, influencing epigenetic signatures.
  • Understanding these modifications requires studying enzymes and substrates in native contexts.

Purpose of the Study:

  • To describe experimental approaches for purifying native chromatin modifier complexes.
  • To present methods for producing recombinant nucleosomes as substrates for activity assays.
  • To introduce a novel system for studying essential chromatin modifiers via nuclear depletion.

Main Methods:

  • Purification of native chromatin modifier complexes from mammalian cells.
  • Production of recombinant nucleosomes for use as enzyme substrates.
  • Development of a nuclear depletion system analogous to yeast anchor-away.

Main Results:

  • Established protocols for isolating native chromatin-modifying complexes.
  • Generated functional recombinant nucleosome substrates to assess enzyme activity.
  • Demonstrated a rapid depletion system for studying essential chromatin modifiers in vivo.

Conclusions:

  • The described methods facilitate the study of chromatin modifiers in their native cellular environments.
  • Standardized protocols will enable robust conclusions on the specificity and function of these genome regulators.
  • These approaches advance the understanding of epigenetic mechanisms governing eukaryotic genomes.