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Related Experiment Videos

DNA synthesis associated with a DNA-nuclear-membrane complex from rat liver

A A Sinha, N S Mizuno

    Cell and Tissue Research
    |September 26, 1977
    PubMed
    Summary

    The M-band, a nuclear structure, contains newly synthesized DNA and supports DNA replication. This process is enhanced in regenerating liver cells, indicating the M-band

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • The nuclear envelope, composed of inner and outer membranes, plays a crucial role in cellular processes.
    • The M-band, a component of the nuclear envelope, has been investigated for its role in DNA metabolism.

    Purpose of the Study:

    • To investigate the ultrastructural composition and biochemical properties of the M-band.
    • To determine the M-band's role in DNA synthesis and its localization within the nucleus.

    Main Methods:

    • Ultrastructural analysis using electron microscopy.
    • Freeze-fracture technique to examine membrane structures.
    • Electron microscopic autoradiography with thymidine-3H to track DNA synthesis.
    • Biochemical assays to determine M-band composition and associated enzymes.

    Main Results:

    • The M-band consists of chromatin, inner nuclear membrane fragments, and nucleopores.
    • The M-band contains the majority of newly labeled DNA and supports in vitro DNA synthesis.
    • DNA synthesis activity is significantly higher in M-band fractions from regenerating liver nuclei.

    Conclusions:

    • The M-band is a site of active DNA synthesis within the nucleus.
    • Its composition and function are linked to DNA replication and repair processes.
    • The M-band's role in DNA synthesis is particularly pronounced during liver regeneration.

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