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Matthew L Hillestad1, Adam J Guenzel, Karl A Nath
1Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA.
Human Gene Therapy
|July 28, 2012
Summary
Researchers developed a novel Cre-lox system using small adeno-associated viral (AAV) vectors for in vivo reporter gene activation. This method overcomes limitations of current reporter systems, enabling precise, quantitative tracking of vector delivery in multiple organs.
Area of Science:
- Molecular Biology
- Gene Therapy
- In Vivo Imaging
Background:
- Current reporter gene systems for in vivo vector pharmacology are limited by the need for unique vectors per reporter, packaging constraints in small vectors, and variable reporter feedback due to cell-to-cell vector copy number.
- These limitations hinder accurate assessment of vector distribution and efficacy.
Purpose of the Study:
- To develop a versatile and quantitative reporter gene system using Cre recombinase delivered via self-complementary adeno-associated viral (scAAV) vectors.
- To overcome the limitations of existing reporter systems for in vivo vector pharmacology and enable precise quantification of vector delivery.
Main Methods:
- Utilized the Cre-lox recombination system with small, high-capacity scAAV vectors to activate reporter genes (luciferase, GFP/RFP) in transgenic mice.
- Injected scAAV-Cre vectors into reporter mice (loxP-inactivated luciferase, mT/mG) and F(1) hybrid mice for in vivo imaging and cell-specific transduction analysis.
- Quantified vector delivery by assessing reporter gene expression in various organs, including liver, kidney, and muscle.
Main Results:
- scAAV-Cre injection enabled luciferase expression comparable to direct AAV-luciferase injection in vivo.
- AAV-Cre mediated red fluorescent protein (RFP) to green fluorescent protein (GFP) conversion in mT/mG mice, indicating successful transduction.
- Simultaneous three-reporter tracking was achieved in F(1) hybrid mice, allowing discrimination of cell-specific transduction across organs.
- The system demonstrated high utility in detecting AAV serotype-specific transduction patterns.
Conclusions:
- The Cre-lox system delivered by scAAV vectors provides a powerful, quantitative method for in vivo reporter gene expression and vector delivery assessment.
- This approach circumvents limitations of traditional reporter systems, particularly for small vectors and precise quantification of transduction.
- The quantum nature of the 'on' or 'off' reporter activation offers a unique advantage for quantifying vector delivery in various biological contexts.
