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Related Experiment Videos

Recombination in vitro between herpes simplex virus type 1 a sequences.

R C Bruckner1, R E Dutch, B V Zemelman

  • 1Department of Biochemistry, Stanford University School of Medicine, CA 94305.

Proceedings of the National Academy of Sciences of the United States of America
|November 15, 1992
PubMed
Summary

Researchers identified a herpes simplex virus type 1 activity that mediates DNA recombination. This enzyme facilitates deletions or inversions between specific DNA sequences, suggesting a site-specific mechanism.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Herpes simplex virus type 1 (HSV-1) infection involves complex genetic processes.
  • Understanding viral DNA recombination is crucial for deciphering viral replication and pathogenesis.

Purpose of the Study:

  • To identify and characterize a cellular activity mediating recombination between HSV-1 specific DNA sequences.
  • To elucidate the mechanism and requirements of this recombination process.

Main Methods:

  • Partial purification of a recombination-mediating activity from HSV-1 infected cell extracts.
  • Construction of DNA substrates with repeated HSV-1 'a' sequences in direct and inverted orientations.
  • Scoring recombination via deletion of a lacZ gene in E. coli.
  • Analysis of reaction products using restriction enzyme digestion and Southern blot analysis.

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Main Results:

  • A specific activity was purified that mediates recombination between direct repeats of the HSV-1 'a' sequence, leading to gene deletion.
  • The same activity, with inverted repeats, resulted in DNA inversion.
  • Recombination activity was also found, at lower levels, in uninfected cells.
  • The reaction requires divalent cations (Mg2+ or Mn2+) but not ATP, and shows high specificity for the 'a' sequence.

Conclusions:

  • The identified activity likely represents a site-specific recombinase involved in HSV-1 DNA manipulation.
  • The findings suggest a mechanism for generating genomic diversity or facilitating viral replication through site-specific recombination.