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Related Experiment Videos

RNA-linked short DNA fragments during polyoma replication.

G Magnusson, V Pigiet, E L Winnacker

    Proceedings of the National Academy of Sciences of the United States of America
    |February 1, 1973
    PubMed
    Summary

    Polyoma DNA replication involves short RNA-primed DNA fragments. Deoxynucleotide starvation halts this process, suggesting a late-stage inhibition in discontinuous DNA synthesis.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Biochemistry

    Background:

    • Polyoma DNA replication is a complex process involving the synthesis of new DNA strands.
    • Understanding the precise mechanisms of DNA synthesis, particularly discontinuous replication, is crucial for comprehending viral replication strategies.

    Purpose of the Study:

    • To investigate the role of short DNA fragments and RNA primers in polyoma DNA replication.
    • To elucidate the impact of deoxynucleotide availability on the late stages of polyoma DNA synthesis.

    Main Methods:

    • In vitro incubation of nuclei from polyoma-infected cells.
    • Analysis of DNA fragments using Cs(2)SO(4) equilibrium centrifugation.
    • Alkaline hydrolysis to identify RNA-DNA linkages and nucleotide incorporation.

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    Main Results:

    • Transient formation of short (4-5 S) DNA fragments during replication, stimulated by ribonucleoside triphosphates.
    • Detection of RNA stretches at the 5'-ends of short DNA chains, with preferential incorporation of dCTP.
    • Accumulation of RNA-deficient short fragments upon deoxynucleotide starvation.

    Conclusions:

    • Polyoma DNA replication involves the transient formation of RNA-primed DNA fragments.
    • A late step in discontinuous polyoma DNA synthesis is sensitive to deoxynucleotide availability.