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Related Concept Videos

Chromatin Packaging02:21

Chromatin Packaging

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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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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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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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...
12.9K
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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Related Experiment Video

Updated: Jul 6, 2025

Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography

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Effective modeling of the chromatin structure by coarse-grained methods.

Irina Tuszynska1, Paweł Bednarz1, Bartek Wilczynski1

  • 1Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Warsaw, Poland.

Journal of Biomolecular Structure & Dynamics
|January 2, 2024
PubMed
Summary

This study introduces ChroMC, a new computational tool for predicting chromatin structure. Effective modeling requires accounting for non-reactive chromatin, simplifying complex structural predictions.

Keywords:
Chromatinchromatin structuremodeling

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Area of Science:

  • Genomics
  • Computational Biology
  • Structural Biology

Background:

  • Interphase chromatin structure is complex, dynamic, and challenging to model experimentally.
  • Experimental methods provide interaction frequencies but lack precise structural information.
  • Theoretical prediction methods are crucial for understanding chromatin organization.

Purpose of the Study:

  • To implement an extended SBS model and develop the ChroMC program for chromatin structure prediction.
  • To identify essential factors for effective chromatin structure modeling in *Drosophila melanogaster*.
  • To compare Monte Carlo and Molecular Dynamics simulation methods for chromatin structure prediction.

Main Methods:

  • Implementation of an extended Self-Avoiding Walk (SAW) polymer model (SBS model).
  • Development of the user-friendly and freely available ChroMC software.
  • Comparison of Monte Carlo and Molecular Dynamics simulation approaches.
  • Analysis of factors influencing chromatin structure prediction, including non-reactive chromatin, loop extrusion models, and Hi-C data.

Main Results:

  • ChroMC program facilitates the prediction of chromatin structure.
  • Inclusion of black, non-reactive chromatin is essential for accurate structure prediction.
  • Loop extrusion models and Hi-C data are not critical for basic chromatin structure reconstruction.
  • A novel method for calculating contact map similarity, including local similarity, was proposed.

Conclusions:

  • The ChroMC program provides a valuable tool for theoretical chromatin structure prediction.
  • Accounting for non-reactive chromatin is a key factor for successful modeling.
  • The study offers insights into the relative importance of different modeling components for chromatin organization.