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Related Concept Videos

Chromatin Packaging01:32

Chromatin Packaging

17.0K
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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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...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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...
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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...
11.2K
Nucleosome Remodeling02:54

Nucleosome Remodeling

9.4K
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...
9.4K
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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Related Experiment Video

Updated: Sep 4, 2025

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion

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Lattice simulation-based diffusion modelling of 3D chromatin structure.

Qingzhu Yang1, Zhihua Zhang1,2

  • 1CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, and China National Center for Bioinformation, Beijing 100101, China.

Computational and Structural Biotechnology Journal
|July 14, 2022
PubMed
Summary
This summary is machine-generated.

Chromatin interactions can be preserved during cell cycle changes. Our models show a small percentage of interactions persist, while interaction hubs are dynamic and require regulation.

Keywords:
Chromatin interactionDiffusionPolymer modelPreserveStructure

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Area of Science:

  • Molecular Biology
  • Genomics
  • Computational Biology

Background:

  • Eukaryotic genomes undergo significant chromatin condensation and decondensation during the cell cycle.
  • A comprehensive model explaining the preservation of chromatin interactions across cell cycles is currently lacking.

Purpose of the Study:

  • To develop and utilize computational models to investigate the preservation of chromatin interactions during decondensation.
  • To analyze the dynamics of interaction hubs and their relationship with preserved interactions.

Main Methods:

  • Developed two lattice-based polymer models simulating decondensation from fractal and anisotropic states.
  • Employed Markov Chain Monte Carlo (MCMC) simulations to model dynamic decondensation processes.

Main Results:

  • Observed approximately 8.17% and 2.03% of interactions preserved during condensation-decondensation transitions in fractal and anisotropic models, respectively.
  • Identified interaction hubs in diffused polymer models, but found they were not associated with preserved interactions.

Conclusions:

  • A subset of chromatin interactions may be preserved during polymer diffusion across the cell cycle.
  • Interaction hubs appear to form dynamically and may require additional regulatory factors for stable preservation.