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Nucleosome packing in interphase chromatin.

J B Rattner, B A Hamkalo

    The Journal of Cell Biology
    |May 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Higher-order chromatin fibers, crucial for DNA packaging, were isolated and analyzed. Findings reveal nucleosomes form continuous arrays, challenging existing models of chromatin structure and condensation.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Chromatin Structure

    Background:

    • Understanding chromatin fiber organization is essential for comprehending genome regulation and stability.
    • Previous models proposed specific packing arrangements like superbeads or solenoids for higher-order chromatin fibers.

    Purpose of the Study:

    • To investigate the structural organization of higher-order chromatin fibers (200-300 A) released from nuclei.
    • To determine if the basic 100-A chromatin fiber is packed into discrete superbeads or a uniform solenoid within the native 250-A fiber.

    Main Methods:

    • Nuclei lysis in the absence of formalin and detergent to release higher-order chromatin fibers.
    • Electron microscopy for detailed analysis of fiber composition and nucleosome arrangement.

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    Main Results:

    • Higher-order chromatin fibers were reproducibly isolated, showing a continuous array of closely apposed nucleosomes.
    • Distinct nucleosome packing patterns were observed, but evidence for discrete superbeads or uniform solenoids was lacking.
    • Similar higher-order fibers were found in metaphase chromosomes, indicating independence from chromatin condensation levels.

    Conclusions:

    • The native 250-A chromatin fiber is not composed of discrete superbeads or a uniform solenoid structure.
    • Higher-order chromatin fiber organization is independent of the in vivo degree of chromatin condensation.
    • This study provides new insights into the fundamental packing principles of chromatin.