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Evaluation of Purification Methods for Minimizing Transgene Expression Background During Viral Manufacturing.

Raphaela Bento1, Alexandra Burr1, Matthew Teryek1

  • 1Department of Biomedical Engineering, Rutgers University, Piscataway, New Jersey, USA.

Human Gene Therapy
|March 19, 2025
PubMed
Summary

Gene therapy viral vector purification is crucial. Tangential flow filtration effectively removes transgene background contamination, enhancing viral potency for therapeutic applications.

Keywords:
gene therapylentivirusproducer cellstangential flow filtrationviral purification

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Area of Science:

  • Biotechnology
  • Gene Therapy
  • Virology

Background:

  • Viral vectors are key for gene therapy, but purification is challenging.
  • Producer cell retro-transduction causes transgene contamination, especially with secreted proteins.
  • This contamination reduces viral potency and therapeutic efficacy.

Purpose of the Study:

  • To evaluate viral purification systems for removing transgene background.
  • To assess the impact of purification on viral vector potency and functionality.
  • To identify optimal methods for producing pure viral batches for gene therapy.

Main Methods:

  • Systematic evaluation of common viral purification systems.
  • Quantification of secreted transgene (Gaussia Luciferase - GLuc) as a contamination marker.
  • Assessment of transduction efficiency and viral potency post-purification.

Main Results:

  • Tangential flow filtration (TFF) demonstrated superior performance.
  • TFF achieved over 90% reduction in GLuc background contamination.
  • Purified viral batches using TFF showed the highest transduction efficiency rates.

Conclusions:

  • Tangential flow filtration is highly effective for removing transgene background in viral vector purification.
  • Optimized purification preserves viral potency and functionality, crucial for gene therapy.
  • This study offers critical insights for producing high-quality viral vectors encoding secreted transgenes.