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Related Experiment Videos

DNA is replicated at the nuclear cage

S J McCready, J Godwin, D W Mason

    Journal of Cell Science
    |December 1, 1980
    PubMed
    Summary
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    HeLa cell nucleoids, containing DNA within RNA-protein cages, reveal that newly synthesized DNA associates with these cages. DNA replication likely initiates at the nuclear cage, with replication units approximately 2 micrometers in size.

    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Genetics

    Background:

    • HeLa cells, when lysed, release structures resembling nuclei called nucleoids.
    • These nucleoids lack membranes and contain DNA within an RNA and protein cage.

    Purpose of the Study:

    • To investigate the association of newly synthesized DNA with nucleoid structures.
    • To determine the location and size of DNA replication units within HeLa cells.

    Main Methods:

    • Lysis of HeLa cells in detergent and high salt to isolate nucleoids.
    • Restriction endonuclease digestion (EcoRI) and filtration to separate bound and unbound DNA.
    • Pulse-labeling and autoradiography to track newly synthesized DNA.
    • Electron microscopy (Kleinschmidt procedure) for structural analysis.

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    Main Results:

    • Newly synthesized DNA preferentially associates with the RNA-protein cages of nucleoids.
    • Electron microscopy shows DNA extending from the cage, with labeling increasing with pulse time.
    • Biochemical and microscopy data suggest replication units are approximately 2 micrometers.

    Conclusions:

    • DNA replication in HeLa cells is proposed to occur at the nuclear cage.
    • Replication units are smaller than the average DNA loop, implying attachment to the cage before synthesis initiation.