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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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Chromatin Packaging02:21

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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

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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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Euchromatin01:01

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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 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.
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Updated: Feb 24, 2026

Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique
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Yeast chromatin subunit structure.

D Lohr, K E Van Holde

    Science (New York, N.Y.)
    |April 11, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Micrococcal nuclease digestion reveals discrete DNA sizes in yeast chromatin, both inside and outside the nucleus. This suggests a common, periodic organization of chromatin across different systems.

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    Generation and Purification of Human INO80 Chromatin Remodeling Complexes and Subcomplexes
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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Chromatin, the complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells, plays a critical role in DNA packaging and gene regulation.
    • Previous studies suggested a periodic organization of chromatin in mammalian systems, but its universality was not established.

    Purpose of the Study:

    • To investigate the structural organization of yeast chromatin using micrococcal nuclease digestion.
    • To determine if the periodic organization observed in mammalian chromatin is a conserved feature in other eukaryotic systems, such as yeast.

    Main Methods:

    • Chromatin was isolated from yeast cells (in situ) and prepared in vitro.
    • Both preparations underwent digestion with micrococcal nuclease, an enzyme that cleaves DNA.
    • The resulting DNA fragments were separated and analyzed by polyacrylamide gel electrophoresis.

    Main Results:

    • Micrococcal nuclease digestion of yeast chromatin, both in situ and in vitro, yielded distributions of DNA molecules of discrete sizes.
    • These DNA fragments were consistently found to be integral multiples of the smallest DNA size observed.
    • The observed size distributions were similar for both intranuclear and in vitro chromatin preparations.

    Conclusions:

    • The findings indicate a widespread, generic occurrence of periodic chromatin organization in yeast.
    • This suggests that the fundamental principles of chromatin packaging, characterized by a repeating structural unit, are conserved across diverse eukaryotic organisms.
    • The study supports the model of chromatin as a higher-order polymer with repeating structural motifs.