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Genetically Encoded SpyTag Enables Modular AAV Retargeting via SpyCatcher-Fused Ligands for Targeted Gene Delivery.

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This study introduces a modular platform for retargeting adeno-associated viral (AAV) vectors using the SpyTag/SpyCatcher system. This innovative approach enables precise cancer cell targeting for gene therapy, enhancing safety and efficacy.

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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Biotechnology

Background:

  • Recombinant adeno-associated viral (rAAV) vectors are key for in vivo gene therapy due to safety and production scalability.
  • Current rAAV retargeting methods often require extensive capsid modification and limit ligand choice.

Purpose of the Study:

  • To develop a modular rAAV retargeting platform using the SpyTag/SpyCatcher system for site-specific ligand attachment.
  • To demonstrate precise cancer cell targeting and therapeutic gene delivery using this novel platform.

Main Methods:

  • Genetic integration of the SpyTag/SpyCatcher system into the AAV2 capsid.
  • Post-assembly functionalization of AAVs with SpyCatcher-fused targeting ligands (DARPins).
  • In vitro and in vivo validation of targeted transduction and therapeutic gene delivery.

Main Results:

  • Successful site-specific covalent coupling of ligands to AAV capsids under physiological conditions.
  • Highly specific transduction of cancer cell lines expressing EGFR, EpCAM, and HER2 with minimal off-target effects.
  • Demonstrated therapeutic efficacy via suicide gene delivery, leading to selective cancer cell killing.

Conclusions:

  • The SpyTag/SpyCatcher platform offers a versatile and rapid method for rAAV retargeting without altering the vector genome or production.
  • This approach supports diverse and complex ligands, facilitating high-throughput preclinical evaluation for gene therapy.
  • The modular platform broadens the application of rAAV for precision gene delivery in therapeutic and research settings.