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Related Experiment Videos

Histone turnover within nonproliferating cells

S L Commerford, A L Carsten, E P Cronkite

    Proceedings of the National Academy of Sciences of the United States of America
    |February 1, 1982
    PubMed
    Summary
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    DNA and histone turnover rates were measured in mice exposed to tritiated water. Histone turnover within cells, not just cell turnover, significantly impacts tissue dynamics.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Toxicology

    Background:

    • Tritiated water exposure can impact cellular components.
    • Understanding DNA and histone turnover is crucial for assessing long-term biological effects.

    Purpose of the Study:

    • To quantify the turnover rates of DNA and histones in mouse liver and brain tissues.
    • To investigate the contribution of intracellular histone turnover versus cell turnover to overall tissue dynamics.

    Main Methods:

    • Mice were exposed to tritiated water from conception to 8 months.
    • Tritium levels in DNA and histones were measured post-exposure cessation.
    • Half-lives for DNA and histone components were calculated in liver and brain.

    Main Results:

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    • Liver histone half-life: 117 days; Liver DNA half-life: 318 days.
    • Brain histone half-life: 159 days; Brain DNA half-life: 593 days.
    • Histone turnover is significantly faster than DNA turnover, indicating intracellular turnover.

    Conclusions:

    • Histone turnover within living cells contributes significantly to overall tissue histone dynamics.
    • Cellular turnover alone does not fully explain histone dynamics in liver and brain.
    • Intracellular histone half-lives were estimated at 117 days (liver) and 223 days (brain).