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Related Experiment Videos

Assembly of an active chromatin structure during replication.

H Weintraub

    Nucleic Acids Research
    |October 10, 1979
    PubMed
    Summary

    Actively transcribed genes rapidly form nucleosomes near replication forks. These genes quickly adopt a DNase I sensitive structure, suggesting rapid DNA sequence recognition during replication in eukaryotic cells.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Genetics

    Background:

    • Chromatin structure plays a crucial role in regulating gene expression.
    • Understanding how active gene conformations are established and maintained during DNA replication is essential for cell division and inheritance.

    Purpose of the Study:

    • To investigate the timing and nature of chromatin assembly for actively transcribed genes following DNA replication.
    • To determine how quickly active gene conformations are established relative to the replication fork.
    • To explore the mechanisms of propagating active chromosomal conformations.

    Main Methods:

    • Pulse labeling of MSB cells with 3H-thymidine.
    • Digestion of isolated nuclei with staphylococcal nuclease or DNase I.
    • Hybridization of nuclease-resistant single-copy DNA to nuclear RNA (nRNA).

    Main Results:

    • Actively transcribed genes are incorporated into nucleosome-like structures within 5-10 nucleosomes of the replication fork.
    • These genes acquire a DNase I sensitive conformation, characteristic of active transcription, within 20 nucleosomes of the fork.
    • The findings suggest rapid and specific DNA sequence recognition events during replication.

    Conclusions:

    • Active gene conformations are established very rapidly after DNA replication.
    • Specific DNA sequence recognition is likely involved in establishing DNase I sensitivity in active genes.
    • The study provides insights into the mechanisms for propagating active chromosomal conformations across cell divisions.

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