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Tetracycline-inducible transgene expression mediated by a single AAV vector
A Chtarto1, H U Bender, C O Hanemann
1Interdisciplinary Research Institute, ULB - Hôspital Erasme, Brussels, Belgium.
Gene Therapy
|January 15, 2003
Summary
This study presents a novel single AAV vector for regulated gene delivery, achieving significant induction levels in vitro and in vivo. The tet-inducible system offers controlled gene expression for potential therapeutic applications.
Area of Science:
- Molecular Biology
- Gene Therapy
- Virology
Background:
- Regulated gene delivery requires inducible promoters and transactivators.
- Single viral vectors are needed for optimal stoichiometry and regulation.
- Interference between promoters can hinder efficient gene expression control.
Purpose of the Study:
- To develop a single adeno-associated virus (AAV) vector for tightly regulated gene delivery.
- To ensure adequate stoichiometry of transactivator and transgene expression.
- To overcome promoter interference issues in gene delivery systems.
Main Methods:
- Constructed a single AAV vector utilizing a bidirectional tetracycline-responsive promoter.
- Initiated transcription of reverse tetracycline transactivator (rtTA) and transgene from the same promoter.
- Utilized bidirectional SV40 polyadenylation sites flanking ITRs for transcription termination.
Main Results:
- Demonstrated up to 50-fold induction in human tumor cell lines and 100-fold in rat Schwann cells.
- Achieved 80-fold induction in vivo in the rat brain.
- Observed superior induced expression compared to constitutive CMV promoter in vitro.
- Reported rapid transgene extinction (<3 days) but slow induction (14 days).
Conclusions:
- The developed autoregulatory tet-inducible (tetON) AAV vector enables controlled gene expression.
- The vector's kinetics are suitable for slowly progressive diseases, allowing rapid switch-off.
- This tetON system avoids chronic antibiotic administration associated with tetOFF vectors.