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Related Experiment Video

Updated: Jun 28, 2026

A Seamless Cloning Approach for Porcine Reproductive and Respiratory Syndrome Virus Expression Vector Construction
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An efficient rHSV-based complementation system for the production of multiple rAAV vector serotypes.

W Kang1, L Wang, H Harrell

  • 1Applied Genetic Technologies Corporation, Alachua, FL 32615, USA.

Gene Therapy
|October 17, 2008
PubMed
Summary
This summary is machine-generated.

Recombinant herpes simplex virus (rHSV) co-infection efficiently produces clinical-grade recombinant adeno-associated virus (rAAV) vectors. This scalable method yields high-titer rAAV for gene therapy applications, demonstrating significant in vivo protein expression.

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Area of Science:

  • Biotechnology
  • Gene Therapy
  • Virology

Background:

  • Recombinant adeno-associated virus (rAAV) vectors are crucial for gene therapy.
  • Scalable and efficient production of clinical-grade rAAV vectors remains a challenge.

Purpose of the Study:

  • To develop and optimize a recombinant herpes simplex virus type 1 (rHSV)-assisted system for high-titer rAAV production.
  • To evaluate the in vivo efficacy of rAAV vectors produced using this novel method.

Main Methods:

  • A co-infection system using two ICP27-deficient rHSV constructs carrying rAAV rep/cap genes and an AAV2 ITR-GOI cassette.
  • Optimization of rAAV production parameters in HEK293 cells.
  • Large-scale production and purification of rAAV1/AAT and rAAV9/AAT vectors.
  • In vivo efficacy studies in mice via intramuscular injection.

Main Results:

  • The rHSV co-infection system achieved over 9000 infectious particles per cell with a high DNase resistance particle to infectious particle (DRP/ip) ratio.
  • Purified rAAV1/AAT and rAAV9/AAT vectors demonstrated significant in vivo human alpha-1-antitrypsin (hAAT) protein expression.
  • rAAV9/AAT achieved clinically relevant hAAT serum levels (9.4 x 10^5 ng/ml).

Conclusions:

  • The rHSV co-infection system offers a highly efficient and scalable method for producing clinical-grade rAAV vectors.
  • This technology holds promise for advancing gene therapy manufacturing and applications.
  • The system enables the production of rAAV serotypes with clinically relevant in vivo expression levels.