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Evolutionarily selected replication origins: functional aspects and structural organization.

G J Lee-Chen, M Woodworth-Gutai

    Molecular and Cellular Biology
    |September 1, 1986
    PubMed
    Summary
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    Simian virus 40 (SV40) replication is enhanced by inverted repeat duplication of the origin. Regulatory sequences between these repeats further boost replication efficiency, especially under T antigen limitation.

    Area of Science:

    • Virology
    • Molecular Biology
    • Genetics

    Background:

    • Simian virus 40 (SV40) undergoes evolutionary changes driven by replicative pressures.
    • The viral replication origin (ori) plays a crucial role in viral DNA synthesis.

    Purpose of the Study:

    • To investigate how structural arrangements of the SV40 replication origin affect replication efficiency.
    • To determine the impact of regulatory sequences within duplicated origins on viral replication.

    Main Methods:

    • Analysis of SV40 variants with different configurations of the replication origin (inverted repeats vs. tandem repeats).
    • Assessing replication efficiency through DNA replication assays.
    • Investigating the effect of inserted cellular sequences on replication.

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    Main Results:

    • Inverted repeat duplication of the SV40 ori significantly enhances replication compared to tandem repeats.
    • Regulatory sequences located between inverted repeats amplify replication enhancement.
    • A 69-bp cellular sequence insertion further boosted replication in specific SV40 variants.
    • Replication efficiency differences were more pronounced under limiting T antigen conditions.

    Conclusions:

    • Structural organization of the SV40 replication origin, particularly inverted repeats, is critical for efficient viral replication.
    • Flanking sequences can modulate replication, with potential inhibitory effects in competitive environments.