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Relationship between chromatin structure and replication in mouse L-cells.

R Sheinin, G Setterfield, I Dardick

    Canadian Journal of Biochemistry
    |December 1, 1980
    PubMed
    Summary
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    Inhibiting DNA replication in mouse cells with antimetabolites halts DNA synthesis and protein formation, leading to cell enlargement and chromatin reorganization. This suggests DNA replication initiation requires new protein synthesis for chromatin disaggregation.

    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Genetics

    Background:

    • Cell division and DNA replication are fundamental processes.
    • Chromatin structure, particularly heterochromatin, plays a crucial role in regulating gene expression and maintaining genome stability.
    • Antimetabolites are compounds that interfere with normal metabolic processes, often used in cancer therapy.

    Purpose of the Study:

    • To investigate the effects of inhibiting DNA replication on cellular processes, including protein synthesis and chromatin organization.
    • To elucidate the relationship between DNA replication, protein synthesis, and chromatin structural changes.
    • To propose a model for the initiation of chromatin replication.

    Main Methods:

    • Mouse L-cells were treated with various DNA replication inhibitors (cytosine arabinoside, hydroxyurea, fluorodeoxyuridine, methotrexate, mitomycin C).

    Related Experiment Videos

  • WT-4 cells were subjected to isoleucine starvation or cycloheximide treatment for comparative analysis.
  • Morphometric analysis was employed to quantify cell and nuclear volumes.
  • Changes in chromatin structure, specifically heterochromatin, were observed and analyzed.

    • Main Results:

    • Inhibition of DNA synthesis by antimetabolites led to cessation of cell division, interrupted protein synthesis (including histones), and significant heterochromatin disaggregation.
    • Cell and nuclear enlargement were observed in cells treated with DNA replication antimetabolites.
    • Isoleucine depletion inhibited DNA synthesis but did not cause massive heterochromatin disaggregation.
    • Cycloheximide inhibited DNA synthesis and growth, preventing chromatin structural reorganization.

    Conclusions:

    • DNA replication initiation is linked to a protein synthesis-dependent process causing chromatin disaggregation.
    • Inhibiting DNA replication and associated protein synthesis reveals this chromatin reorganization mechanism.
    • The findings provide insights into the complex interplay between DNA replication, protein synthesis, and chromatin dynamics.