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Related Concept Videos

In vitro Mutagenesis01:16

In vitro Mutagenesis

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Translesion DNA Polymerases

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In situ Subcellular Fractionation of Adherent and Non-adherent Mammalian Cells
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Published on: July 23, 2010

Papillomavirus DNA complementation in vivo.

Jiafen Hu1, Nancy M Cladel, Lynn Budgeon

  • 1Jake Gittlen Cancer Research Foundation, Department of Pathology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.

Virus Research
|April 22, 2009
PubMed
Summary
This summary is machine-generated.

Researchers used a rabbit model to study papillomaviruses. They found that two non-viable papillomavirus (PV) genomes could combine, forming papillomas and demonstrating complementation in vivo.

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Area of Science:

  • Virology
  • Molecular Biology
  • Oncology

Background:

  • Phylogenic studies suggest ancient papillomavirus (PV) recombination, but experimental evidence is lacking due to the absence of human PV infection models.
  • The cottontail rabbit papillomavirus (CRPV)/rabbit model offers a system to study PV pathogenesis and genome interactions in vivo.

Purpose of the Study:

  • To experimentally investigate the potential for DNA recombination or complementation between non-viable papillomavirus genomes in a living organism.
  • To test whether co-infection with specific PV mutants could lead to papilloma formation and the generation of viable viral genotypes.

Main Methods:

  • Utilized a panel of characterized cottontail rabbit papillomavirus (CRPV) mutants with defined genetic defects (E2 transactivation domain mutation, E7 ATG knockout).
  • Inoculated rabbits with combinations of non-viable CRPV DNA mutants and monitored papilloma development.
  • Analyzed DNA from resultant papillomas to determine the genotypes present, assessing for evidence of recombination or complementation.

Main Results:

  • Co-infection with a CRPV mutant lacking E2 transactivation and another with an E7 knockout successfully induced papillomas in rabbits.
  • DNA analysis of these papillomas revealed genotypes derived from both parental mutant genomes.
  • Similar complementation outcomes were observed with three additional pairs of dysfunctional CRPV mutants.
  • Wild-type genes were shown to rescue the function of their corresponding mutant counterparts, confirming functional complementation.

Conclusions:

  • The study provides the first experimental evidence for complementation between non-viable papillomavirus (PV) genomes in vivo.
  • Complementation, rather than recombination, appears to be the primary mechanism enabling papilloma formation from co-infected dysfunctional PV mutants in this model.
  • This finding has implications for understanding PV evolution and the genetic interactions governing viral pathogenesis.