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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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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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Chromatin Modification in iPS Cells01:32

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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.
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Chromatin Position Affects Gene Expression02:35

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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. 
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Related Experiment Video

Updated: Feb 25, 2026

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Real-time visualization of chromatin modification in isolated nuclei.

Luca Sardo1, Angel Lin1, Svetlana Khakhina1

  • 1Department of Biological Sciences, McNeil Science and Technology Center, University of the Sciences, 600 S 43rd Street, Philadelphia, PA 19104, USA.

Journal of Cell Science
|July 27, 2017
PubMed
Summary

Researchers developed a new microscopy method to visualize endogenous chromatin modifications in real-time within isolated nuclei. This technique allows studying dynamic nuclear events and chromatin changes at the single-nucleus level.

Keywords:
AcetylationChromatinHistoneMicroscopyNucleus

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Microscopy

Background:

  • Traditional chromatin modification assays yield static, population-level data.
  • Existing microscopy methods struggle with nuclear visualization in live cells.
  • A need exists for real-time observation of endogenous chromatin dynamics.

Purpose of the Study:

  • To develop a novel microscopy technique for real-time visualization of endogenous chromatin modifications.
  • To enable the study of dynamic nuclear processes at the single-nucleus level.
  • To map key nuclear markers and observe their changes upon specific treatments.

Main Methods:

  • Isolation of transcriptionally competent nuclei.
  • Antibody staining without fixation for endogenous chromatin visualization.
  • Confocal and structured illumination microscopy.
  • Real-time addition of drugs and fluorescent probes to nuclei.

Main Results:

  • High-resolution mapping of 11 endogenous nuclear markers (histone code, transcription machinery, architecture).
  • Detection of dynamic changes in chromatin modification and localization at the single-nucleus level.
  • Observation of chromatin alterations following histone deacetylation inhibition.

Conclusions:

  • The developed method provides unprecedented real-time insights into endogenous chromatin dynamics.
  • This technique is applicable to studying RNA transcription, viral protein function, and nuclear architecture.
  • Enables detailed analysis of nuclear events at the single-nucleus level without fixation.