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Related Experiment Videos

Changes in histone H3 composition and synthesis pattern during lymphocyte activation.

R S Wu, S Tsai, W M Bonner

    Biochemistry
    |August 2, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Resting human lymphocytes synthesize histones without DNA replication, showing a distinct pattern from dividing cells. Activation by phytohemagglutinin alters histone H3 variant composition in lymphocyte chromatin.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Epigenetics

    Background:

    • Histones are crucial for DNA packaging and chromatin structure.
    • Histone variant composition can change with cellular state, particularly during cell cycle progression.
    • Quiescent cells exhibit specific histone synthesis patterns distinct from actively dividing (S-phase) cells.

    Purpose of the Study:

    • To investigate histone variant synthesis in resting and activated human lymphocytes.
    • To determine if histone synthesis in resting lymphocytes is due to S-phase cell contamination.
    • To analyze changes in histone H3 variant composition upon lymphocyte activation.

    Main Methods:

    • Isolation of human lymphocytes.
    • Analysis of histone variant synthesis rates and patterns.
    • Stimulation of lymphocytes with phytohemagglutinin (PHA).
    • Assessment of histone H3 variant and mass patterns in resting and activated cells.
    • Induction of DNA synthesis via UV irradiation in resting lymphocytes.

    Main Results:

    • Resting lymphocytes synthesize histones at a significant rate, independent of DNA synthesis.
    • Histone variant synthesis patterns in resting lymphocytes resemble other quiescent cells, not S-phase cells.
    • Phytohemagglutinin stimulation causes a marked change in histone H3 variant and mass patterns.
    • UV-induced DNA repair in resting lymphocytes does not alter the histone variant synthesis pattern or quantity.

    Conclusions:

    • Histone synthesis in resting lymphocytes is a genuine process, not due to S-phase contamination.
    • Lymphocyte activation leads to significant alterations in chromatin composition, specifically histone H3 variants.
    • The proportion of histone H3.3 may correlate with the duration of cellular quiescence.