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Related Experiment Videos

Late coding region sequences required for competition by SV40 defectives.

F J O'Neill1, T H Miller, R Stevens

  • 1Research Service, V. A. Medical Center, Salt Lake City, Utah.

Virology
|December 1, 1987
PubMed
Summary
This summary is machine-generated.

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SV40 late region (L-SV40) DNA strongly outcompetes wild-type SV40 and persists in cells, while early region (E-SV40) DNA does not. The Vp1 gene is crucial for L-SV40

Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Simian virus 40 (SV40) defectives are viral genomes with partial deletions.
  • Understanding the replication and competition dynamics of SV40 variants is crucial for viral evolution studies.
  • SV40 T-antigen is essential for viral DNA replication.

Purpose of the Study:

  • To investigate the competitive ability of SV40 defective genomes containing either the early (E-SV40) or late (L-SV40) coding regions.
  • To determine the role of specific SV40 genes, particularly Vp1 and Vp2, in viral competition and replication.
  • To analyze the persistence and dominance of L-SV40 over other SV40 defective variants.

Main Methods:

  • Transfection of green monkey cells with E-SV40 and L-SV40 defectives.

Related Experiment Videos

  • Co-infection assays with wild-type SV40 (wtSV40) to assess competition.
  • Replication assays in Cos1 cells expressing SV40 T-antigen.
  • Introduction of deletion/insertion mutations in Vp1 and Vp2 genes of L-SV40 for functional analysis.

    • Main Results:

    • L-SV40 strongly outcompeted wtSV40, overgrowing it by at least 10:1 and reducing wtSV40's cytopathic effect.
    • L-SV40 DNA replicated continuously in Cos1 cells, whereas E-SV40 showed transient replication.
    • Mutations in the Vp1 gene impaired L-SV40's ability to compete with wtSV40 and resulted in transient replication, unlike Vp2 mutants which retained strong competitive and continuous replication abilities.

    Conclusions:

    • L-SV40 is a potent competitor against wtSV40 and other SV40 defective variants.
    • The Vp1 gene, or a portion thereof, plays a critical role in the competitive advantage of L-SV40.
    • The Vp1 gene likely facilitates L-SV40 genome persistence rather than directly interfering with wtSV40 replication.