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Related Concept Videos

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
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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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Position-effect Variegation02:32

Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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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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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Related Experiment Video

Updated: Mar 20, 2026

Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Author Spotlight: Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

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A random effect model for reconstruction of spatial chromatin structure.

Jincheol Park1,2,3, Shili Lin2,3

  • 1Department of Statistics, Keimyung University, Daegu, South Korea.

Biometrics
|May 24, 2016
PubMed
Summary

We developed a new statistical model, the Poisson Random effect Architecture Model (PRAM), to reconstruct 3D genome structure from Hi-C data. PRAM improves accuracy by accounting for data correlations and over-dispersion.

Keywords:
3D architectureCorrelation between countsHi-C dataLoopingRandom effect modeling

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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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Related Experiment Videos

Last Updated: Mar 20, 2026

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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.

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Area of Science:

  • Genomics
  • Computational Biology
  • Molecular Biology

Background:

  • Gene regulation involves distal enhancers and repressors, necessitating understanding of chromosome spatial organization.
  • Next Generation Sequencing (NGS) technologies, like Hi-C, enable genome-wide detection of physical chromatin contacts.
  • Reconstructing 3D chromatin structure from Hi-C data is crucial for understanding gene regulation.

Purpose of the Study:

  • To introduce the Poisson Random effect Architecture Model (PRAM) for inferring 3D chromatin structure from Hi-C data.
  • To address limitations of previous methods by incorporating over-dispersion and correlations in contact counts.
  • To validate PRAM's performance against experimental data and existing computational approaches.

Main Methods:

  • Development of the Poisson Random effect Architecture Model (PRAM).
  • Application of PRAM to Hi-C data for genome-wide spatial interaction analysis.
  • Comparison of PRAM-predicted distances with Fluorescence In Situ Hybridization (FISH) validation data.

Main Results:

  • PRAM demonstrates greater consistency with observed Hi-C data compared to existing methods.
  • Validation experiments confirm the accuracy of PRAM's predicted distances.
  • Comparative analyses on real and simulated data highlight PRAM's superior performance.

Conclusions:

  • PRAM provides a robust statistical framework for 3D chromatin structure reconstruction from Hi-C data.
  • The model's ability to handle over-dispersion and correlations enhances the reliability of inferred spatial genome organization.
  • PRAM represents a significant advancement in computational approaches for studying genome architecture and gene regulation.