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Related Experiment Videos

Retroviral gene transfer using safe and efficient packaging cell lines.

D Markowitz1, C Hesdorffer, M Ward

  • 1Department of Genetics, Columbia University, College of Physicians and Surgeons, New York, New York 10032.

Annals of the New York Academy of Sciences
|January 1, 1990
PubMed
Summary
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New retroviral packaging cell lines, GP + E-86 and GP + envAm12, enable safe and efficient gene therapy. These lines produce high-titer replication-deficient retroviral vectors without generating replication-competent virus for potential human and murine applications.

Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Virology

Background:

  • Gene therapy requires packaging cell lines that produce high-titer, replication-deficient retroviral vectors.
  • Replication-competent virus can arise from recombination between helper virus and retroviral vectors.

Purpose of the Study:

  • To construct and characterize novel retroviral packaging cell lines for gene therapy.
  • To assess the safety and efficiency of these packaging lines in producing replication-deficient retroviral vectors.

Main Methods:

  • Construction of ecotropic (GP + E-86) and amphotropic (GP + envAm12) packaging cell lines using fragmented helper virus genomes on separate plasmids.
  • Deletions in packaging sequence and 3' LTR were introduced into plasmids.
  • Assessment of retroviral titers and detection of wild-type virus generation.

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Main Results:

  • Both GP + E-86 and GP + envAm12 cell lines produced high titers of retroviral vectors comparable to single-plasmid systems.
  • No evidence of wild-type retrovirus generation was observed with these packaging lines.
  • Successful transfer of the neoR gene into mouse hematopoietic cells and long-term engraftment (up to 200 days) were demonstrated.

Conclusions:

  • The developed packaging cell lines are safe and efficient for producing replication-deficient retroviral vectors.
  • These cell lines are suitable for gene therapy applications in murine (GP + E-86) and human (GP + envAm12) systems.
  • The fragmented genome approach effectively prevents the generation of replication-competent retroviruses.