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Related Experiment Videos

Simultaneous induction of epigenetic variants.

M Harris

    Somatic Cell and Molecular Genetics
    |November 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Epigenetic changes in Chinese Hamster Ovary (CHO-K1) cells treated with 5-azacytidine occurred more frequently than predicted by chance. This suggests non-random, coordinated epigenetic events influenced by individual cell properties.

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    Area of Science:

    • Cell Biology
    • Epigenetics
    • Genetics

    Background:

    • Epigenetic modifications play a crucial role in gene regulation and cellular function.
    • 5-azacytidine is a known epigenetic modifier that can induce changes in DNA methylation.
    • CHO-K1 cells are a widely used model system in biological research.

    Purpose of the Study:

    • To investigate the frequency and coordination of epigenetic changes induced by 5-azacytidine in CHO-K1 cells.
    • To determine if the observed epigenetic changes follow a purely stochastic model or if coordinated events occur.
    • To explore the role of individual cell variability in the response to epigenetic modifiers.

    Main Methods:

    • Induction of epigenetic changes at one, two, or three specific loci in CHO-K1 cells using 5-azacytidine.

    Related Experiment Videos

  • Utilizing high-frequency reversion markers: proline dependence, asparagine dependence, and thymidine kinase deficiency.
  • Comparing observed frequencies of dual and triple revertants with frequencies predicted by a stochastic model.
  • Isolating single cell clones post-treatment to assess individual cell competence for reversion.

    • Main Results:

    • Observed frequencies of dual and triple epigenetic revertants significantly exceeded predictions from a purely stochastic model.
    • The incidence of triple revertants was approximately 1000-fold higher than expected by chance.
    • Isolated clones exhibited reproducible and substantial differences in their capacity for reversion from proline dependence.
    • Data indicate the existence of cell subpopulations with varying reactivity to 5-azacytidine.

    Conclusions:

    • Simultaneity of epigenetic changes is not solely a product of random events.
    • A mosaic of varying inductive potentials within individual cells modulates epigenetic responses.
    • Coordinate epigenetic events are influenced by inherent cellular characteristics rather than purely stochastic processes.