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Rescue of a pathogenic Marek's disease virus with overlapping cosmid DNAs: use of a pp38 mutant to validate the

Sanjay M Reddy1, Blanca Lupiani, Isabel M Gimeno

  • 1Avian Disease and Oncology Laboratory, Agricultural Research Service, 3606 East Mount Hope Road, East Lansing, MI 48823, USA. sreddy@msu.edu

Proceedings of the National Academy of Sciences of the United States of America
|May 9, 2002
PubMed
Summary

Researchers developed new tools to study Marek's disease virus (MDV) genetics. A pp38 deletion mutant showed this phosphoprotein is crucial for early infection but not tumor development in Marek's disease.

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Area of Science:

  • Virology
  • Oncology
  • Molecular Biology

Background:

  • Marek's disease virus (MDV) genetics research is limited by a lack of tools for precise genetic modification in its highly cell-associated oncogenic strains.
  • Previous studies on other herpesviruses utilized overlapping cosmid clones for genetic manipulation.
  • Developing such tools for MDV is essential for understanding its pathogenesis and oncogenic mechanisms.

Purpose of the Study:

  • To develop a system for introducing site-specific mutations into the MDV genome.
  • To investigate the function of the MDV unique phosphoprotein pp38.
  • To understand the role of pp38 in MDV-induced transformation and pathogenesis.

Main Methods:

  • Construction of overlapping cosmid DNA clones from a very virulent oncogenic MDV strain.
  • Transfection of cosmid clones into MDV-susceptible cells to generate recombinant MDV (rMd5).
  • Generation of a pp38 deletion mutant (rMd5 Delta pp38) and inoculation into susceptible birds.

Main Results:

  • Successful generation of a recombinant MDV (rMd5) with properties similar to the parental strain.
  • The pp38 deletion mutant (rMd5 Delta pp38) was created and tested in vivo.
  • Results indicated pp38 is essential for early cytolytic infection in lymphocytes but dispensable for tumor induction.

Conclusions:

  • The developed cosmid cloning technology enables efficient genetic manipulation of MDV.
  • The pp38 phosphoprotein plays a critical role in the early stages of MDV infection.
  • This research provides insights into MDV pathogenesis and may inform studies on other herpesvirus oncogenesis.