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DNA replication efficiency depends on transcription factor-binding sites.

W J Turner1, M E Woodworth

  • 1Department of Microbiology, Miami University, Oxford, Ohio 45056, USA.

Journal of Virology
|May 18, 2001
PubMed
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Transcription factor-binding sites enhance simian virus 40 (SV40) DNA replication. Even without transcription pressure, SV40 variants retain Sp1 sites and incorporate AP-1 and NF-1 sites, boosting replication efficiency.

Area of Science:

  • Molecular Biology
  • Virology

Background:

  • Simian virus 40 (SV40) variants arise from serial passage, offering insights into DNA replication mechanisms.
  • These variants are selected for efficient replication, not transcription, making their regulatory region composition noteworthy.

Purpose of the Study:

  • To investigate the role of transcription factor-binding sites in enhancing SV40 DNA replication.
  • To determine how the number and type of binding sites influence replication efficiency.

Main Methods:

  • Cotransfection of COS-1 cells with plasmid constructs containing the SV40 origin of replication (ori).
  • Analysis of relative replication efficiency (RRE) based on varying transcription factor-binding sites (Sp1, AP-1, NF-1).

Main Results:

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  • Replication efficiency (RRE) increases with the number of transcription factor-binding sites.
  • AP-1 sites demonstrate higher effectiveness in enhancing replication compared to NF-1 sites.
  • Competition in transfections amplifies observed differences in RRE.

    • Conclusions:

    • Transcription factor-binding sites significantly enhance SV40 DNA replication.
    • The composition and number of these sites are critical for optimizing viral replication.