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Halting Recombinant Adeno-Associated Virus Transgene Expression Using mRNA-Lipid Nanoparticle-Delivered

Rubens Tavora1,2, Lizhou Zhang3, Mai H Tran3

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Meganucleases can now control recombinant adeno-associated virus (rAAV) gene therapy. This system uses targeted DNA cleavage to safely halt transgene expression if needed, improving gene therapy safety.

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gene therapymRNA-loaded lipid nanoparticlesmeganucleasesrecombinant adeno-associated virustransgene

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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Biotechnology

Background:

  • Recombinant adeno-associated virus (rAAV) vectors are widely used in gene therapy for their efficacy.
  • Current rAAV therapies lack a reliable method to control or halt transgene expression in adverse events.
  • Enhanced safety mechanisms are crucial for long-term gene therapy applications.

Purpose of the Study:

  • To develop a controllable safety switch for rAAV gene therapy using meganucleases.
  • To investigate the efficacy of meganucleases in disrupting rAAV transgene expression.
  • To enhance the safety profile of rAAV vectors for clinical use.

Main Methods:

  • Engineered rAAV vectors with meganuclease target sites within transgene sequences.
  • Screened various meganucleases using luciferase assays to identify efficient candidates (I-AniI-Y2, I-BmoI, I-PpoI).
  • Optimized meganuclease targeting by placing sites in introns and untranslated regions (UTRs).
  • Demonstrated inhibition of rAAV expression using mRNA-loaded lipid nanoparticles in vitro.

Main Results:

  • Identified specific meganucleases (I-AniI-Y2, I-BmoI, I-PpoI) with high cleavage efficiency.
  • Strategic placement of target sites significantly improved meganuclease efficacy.
  • Successfully demonstrated robust inhibition of rAAV-mediated transgene expression in vitro.
  • Confirmed meganucleases can effectively disrupt transgene activity.

Conclusions:

  • Meganucleases offer a promising strategy for a controllable safety mechanism in rAAV gene therapy.
  • This approach enables targeted disruption of transgene expression, enhancing vector safety.
  • The findings represent a significant step towards safer, long-term gene therapy interventions.