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Related Concept Videos

Chromatin Packaging02:21

Chromatin Packaging

20.6K
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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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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DNA Packaging00:58

DNA Packaging

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Overview
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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...
7.0K
Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
51.7K
Euchromatin01:01

Euchromatin

8.6K
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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Related Experiment Video

Updated: Dec 10, 2025

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

Published on: November 11, 2025

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Characterizing chromatin packing scaling in whole nuclei using interferometric microscopy.

Aya Eid, Adam Eshein, Yue Li

    Optics Letters
    |September 2, 2020
    PubMed
    Summary

    Researchers developed a new method using spectral microscopy to measure chromatin structure, a key factor in gene expression. This label-free technique quantifies nanoscale chromatin packing efficiently and accurately.

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    Area of Science:

    • Molecular Biology
    • Biophysics
    • Microscopy

    Background:

    • Chromatin's conformation regulates gene expression by controlling DNA accessibility.
    • Quantifying chromatin structure at the nanoscale is crucial for understanding cellular processes.

    Purpose of the Study:

    • To develop an analytical framework for quantifying chromatin structure using spectral microscopy.
    • To establish a model for measuring chromatin's mass fractal dimension (D).

    Main Methods:

    • Utilized partial wave spectroscopy (PWS), an interferometric technique.
    • Employed finite difference time domain (FDTD) simulations for validation.
    • Developed a label-free, high-throughput analytical framework.

    Main Results:

    • Chromatin structure was modeled as a mass fractal with packing scaling D.
    • PWS measurements of D were validated against electron microscopy data.
    • The method enables accurate quantification of chromatin structure at the nanoscale.

    Conclusions:

    • The developed framework provides a robust method for analyzing chromatin architecture.
    • This technique offers a high-throughput, label-free approach to studying gene regulation.
    • The findings advance our understanding of nanoscale chromatin organization and its functional implications.