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Related Concept Videos

Heterochromatin02:38

Heterochromatin

11.2K
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...
11.2K
Euchromatin01:01

Euchromatin

6.8K
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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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...
5.4K
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...
16.6K
Karyotyping01:17

Karyotyping

58.0K
Overview
58.0K
Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

11.1K
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: Jun 6, 2025

Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation
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Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation

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Chromatin architecture mapping by multiplex proximity tagging.

Axel Delamarre, Benton Bailey, Jennifer Yavid

    Biorxiv : the Preprint Server for Biology
    |November 28, 2024
    PubMed
    Summary
    This summary is machine-generated.

    We developed Proximity Copy Paste (PCP), a novel method to map DNA molecule interactions in 3D space. This technique reveals regular nucleosome arrays and provides evidence for cohesin loop clustering in chromosome compaction.

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    Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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    Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation
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    An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues
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    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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    Area of Science:

    • Molecular Biology
    • Genomics
    • Chromatin Structure

    Background:

    • Chromatin organization is crucial for genome functions like expression, replication, and maintenance.
    • Understanding 3D chromatin architecture is essential for deciphering gene regulation and cellular processes.

    Purpose of the Study:

    • To develop a novel proximity-tagging method for high-resolution mapping of molecular interactions in 3D space.
    • To investigate the organization and connectivity of individual nucleosomes in Saccharomyces cerevisiae.

    Main Methods:

    • Developed Proximity Copy Paste (PCP), a DNA barcoding technique to identify associated molecules in 3D.
    • Applied PCP to map nucleosome connectivity and organization on single chromatin fibers.
    • Analyzed nuclease footprinting data to define chromatin states and identify non-canonical nucleosomes.

    Main Results:

    • Demonstrated that chromatin is primarily organized into regularly spaced nucleosome arrays, influenced by gene size and transcription.
    • Provided the first direct evidence for cohesin loop clustering as a mechanism for metaphase chromosome compaction.
    • Identified Overlapping-Di-Nucleosomes (OLDN) as a stable, non-canonical feature of chromatin structure.

    Conclusions:

    • PCP is a versatile method for high-resolution mapping of local and long-range molecular interactions.
    • The study elucidates fundamental principles of chromatin organization, including nucleosome array regularity and chromosome compaction mechanisms.
    • Revealed the stable presence of non-canonical nucleosome structures within chromatin populations.