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Related Experiment Videos

Enriched autonomously replicating sequences in a nuclear matrix-DNA complex isolated from synchronized HeLa cells.

M P Aguinaga, C E Kiper, M S Valenzuela

    Biochemical and Biophysical Research Communications
    |April 29, 1987
    PubMed
    Summary

    Synchronizing HeLa cells for DNA replication enriches autonomously replicating sequences (ARS) within the nuclear matrix-bound DNA component. This finding highlights the nuclear matrix

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Genetics

    Background:

    • The nuclear matrix is a structural component of the cell nucleus.
    • DNA replication origins are crucial for genome duplication.
    • Autonomously replicating sequences (ARS) are DNA elements that initiate replication in yeast.

    Purpose of the Study:

    • To investigate the association of DNA replication origins with the nuclear matrix.
    • To determine if DNA replication timing influences the localization of ARS elements.
    • To explore the potential role of the nuclear matrix in organizing replication origins.

    Main Methods:

    • Isolation of nucleoids from synchronized and exponentially growing HeLa cells.
    • Digestion with restriction enzymes to separate nuclear matrix-bound DNA.

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  • Construction of partial DNA libraries and testing for ARS activity using yeast transformation assays.

    • Main Results:

    • A DNA component bound to the nuclear matrix was isolated.
    • Libraries constructed from this matrix-bound DNA showed ARS activity.
    • Synchronization for DNA replication led to an enrichment of ARS in the matrix-bound DNA library.

    Conclusions:

    • The nuclear matrix is enriched for DNA sequences capable of initiating replication.
    • DNA replication timing, specifically during S phase, correlates with ARS localization to the nuclear matrix.
    • These findings suggest a role for the nuclear matrix in the spatial organization and regulation of DNA replication origins.