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Related Concept Videos

Chromatin Packaging01:32

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, 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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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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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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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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Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Related Experiment Video

Updated: Jul 25, 2025

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C

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iEnhance: a multi-scale spatial projection encoding network for enhancing chromatin interaction data resolution.

Kai Li1, Ping Zhang1, Zilin Wang1

  • 1Hubei Key Laboratory of Agricultural Bioinformatics, College of Informatics, Huazhong Agricultural University, Wuhan 430070, China.

Briefings in Bioinformatics
|June 29, 2023
PubMed
Summary
This summary is machine-generated.

iEnhance enhances low-resolution chromatin interaction data to reveal precise 3D genome architecture. This AI tool improves structural element accuracy for better insights into genome organization.

Keywords:
chromatin interaction datachromatin loopdeep learningmodel evaluationtopological associating domain

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High-Resolution Mapping of Protein-DNA Interactions in Mouse Stem Cell-Derived Neurons using Chromatin Immunoprecipitation-Exonuclease ChIP-Exo
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Area of Science:

  • Genomics
  • Computational Biology
  • Bioinformatics

Background:

  • High-throughput chromatin interaction data are crucial for understanding 3D genome architecture.
  • Data sparseness and high signal-noise ratio limit the precision of structural elements derived from these methods.
  • Existing tools struggle to accurately recover both short-range and long-range interaction patterns.

Purpose of the Study:

  • To develop a novel computational tool, iEnhance, for enhancing the resolution of chromatin interaction data.
  • To improve the precision of 3D genome structural elements by overcoming data limitations.
  • To create a versatile tool applicable to various chromatin interaction datasets and cell types.

Main Methods:

  • iEnhance employs a multi-scale spatial projection and encoding network.
  • It extracts multi-scale global and local features from input data using matrix projection.
  • Features are hierarchically fused via an attention mechanism, followed by dense channel encoding and residual channel decoding.

Main Results:

  • iEnhance significantly outperforms existing state-of-the-art Hi-C resolution enhancement tools.
  • The method precisely recovers both short-range structural elements and long-range interaction patterns.
  • iEnhance demonstrates robust performance across diverse datasets, including single-cell Hi-C and Micro-C, and is transferable to new cell lines.

Conclusions:

  • iEnhance provides a robust and accurate method for high-resolution chromatin interaction data enhancement.
  • The tool overcomes limitations of sparse and noisy data, enabling more precise 3D genome architecture analysis.
  • iEnhance offers broad applicability and transferability for various genomic studies.