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Nuclear asynchrony in multinucleate rat kangaroo cells.

S Ghosh, N Paweletz

    European Journal of Cell Biology
    |November 1, 1984
    PubMed
    Summary
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    Colcemid treatment induced multinucleate (MN) cells with asynchronous nuclear cycles. Chromosome 4 may possess genes essential for condensation, unlike other chromosomes in these MN cells.

    Area of Science:

    • Cell Biology
    • Cytogenetics
    • Molecular Biology

    Background:

    • Multinucleate (MN) cells are often studied to understand cell cycle regulation.
    • Nuclear asynchrony within a single cell can lead to complex chromosomal abnormalities.
    • PtK1 cells provide a model system for investigating mitotic processes.

    Purpose of the Study:

    • To investigate the induction of nuclear asynchrony in multinucleate PtK1 cells.
    • To identify potential mechanisms underlying chromosome condensation failures.
    • To explore the role of specific chromosomes in regulating mitotic condensation.

    Main Methods:

    • Induction of multinucleate cells using colcemid treatment in PtK1 cells.
    • Microscopic observation of nuclear and chromosomal morphology during different cell cycle phases.

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  • Analysis of chromosome condensation patterns in asynchronous metaphase cells.

    • Main Results:

    • Colcemid treatment resulted in a high percentage of MN cells exhibiting nuclear asynchrony in DNA synthesis and mitosis.
    • Asynchronous nuclei within MN cells displayed varying stages, including interphase, S-phase, and abnormal metaphase/anaphase.
    • Chromosome 4 was consistently observed in a fully condensed state, while other chromosomes sometimes remained decondensed in asynchronous metaphase.
    • Uneven distribution of cell cycle inducers due to cytoplasmic compartmentalization is a potential explanation for observed abnormalities.

    Conclusions:

    • Nuclear asynchrony in MN cells can arise from cytoplasmic factors affecting cell cycle progression.
    • Chromosome 4 may play a critical role in regulating chromosome condensation, potentially through specific genes.
    • Incomplete chromosome condensation in some nuclei may occur due to unequal availability of condensation inducers, leading to mitotic defects.