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Programmed macromolecular synthesis in regenerating karyoplasts.

J D White, J Bruno, J J Lucas

    Molecular and Cellular Biology
    |October 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Karyoplasts can regenerate into whole cells by following a specific biosynthetic program. This process involves regulated protein synthesis and cytoplasmic regeneration before DNA replication can occur.

    Area of Science:

    • Cell biology
    • Biochemistry

    Background:

    • Karyoplasts, enucleated cells, offer a model for studying cytoplasmic regulation of nuclear activity.
    • Understanding the conditions for karyoplast regeneration is crucial for cell biology research.

    Purpose of the Study:

    • To define conditions for preparing and maintaining viable karyoplasts capable of regeneration.
    • To investigate the biochemical and molecular events during karyoplast regeneration.

    Main Methods:

    • Two-dimensional gel electrophoresis to analyze polypeptide synthesis.
    • Autoradiography to assess DNA synthesis.
    • Cellular fractionation to study protein localization.

    Main Results:

    • Karyoplast regeneration follows a reproducible biosynthetic program with specific polypeptide synthesis patterns.

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  • Nuclear, cytoskeletal-microtrabecular, and soluble protein fractions show significant regulation.
  • Microfilaments, intermediate filaments, and microtubules are assembled during regeneration.
  • DNA synthesis is initiated only after substantial cytoplasmic regeneration.

    • Conclusions:

    • Karyoplasts can regenerate into viable cells under defined conditions.
    • Cytoplasmic regeneration is a prerequisite for nuclear DNA replication in this model system.
    • The study elucidates key molecular events governing cell regeneration from enucleated components.