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Related Experiment Videos

Mitochondrial RNA synthesis during mitosis.

H Fan, S Penman

    Science (New York, N.Y.)
    |April 3, 1970
    PubMed
    Summary

    During metaphase arrest, HeLa cells produced normal mitochondrial RNA but little nuclear RNA. Mitochondrial RNA synthesis in mitotic cells was ethidium bromide-resistant, unlike in interphase cells.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Cell cycle regulation impacts gene expression.
    • Mitochondrial RNA synthesis is crucial for cellular respiration.
    • Ethidium bromide is a known inhibitor of mitochondrial DNA and RNA synthesis.

    Purpose of the Study:

    • To investigate mitochondrial RNA synthesis during metaphase arrest in HeLa cells.
    • To compare the characteristics of RNA synthesized during mitosis with that of interphase cells.
    • To determine the effect of ethidium bromide on mitochondrial RNA synthesis in mitotic cells.

    Main Methods:

    • HeLa cells were arrested in metaphase.
    • RNA synthesis was measured in both nuclear and mitochondrial fractions.
    • RNA products were analyzed for size distribution (major peaks at 21S, 12S, and 4S).
    • The effect of ethidium bromide on RNA synthesis was assessed.

    Main Results:

    • HeLa cells in metaphase arrest synthesized normal amounts of mitochondrial RNA.
    • Nuclear RNA synthesis was significantly reduced during metaphase arrest.
    • The synthesized mitochondrial RNA resembled ethidium bromide-sensitive RNA from interphase cells.
    • Mitochondrial RNA synthesis in mitotic cells was completely resistant to ethidium bromide inhibition.

    Conclusions:

    • Mitochondrial RNA synthesis proceeds during metaphase arrest in HeLa cells.
    • Nuclear RNA synthesis is suppressed during mitosis.
    • Mitochondrial RNA synthesis in mitotic cells exhibits altered sensitivity to ethidium bromide compared to interphase cells.

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