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Production and Titering of Recombinant Adeno-associated Viral Vectors
Published on: November 27, 2011
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Atrial-Specific Gene Delivery Using an Adeno-Associated Viral Vector
Li Ni1,2,3,4, Larry Scott1,2, Hannah M Campbell1,2
1From the Cardiovascular Research Institute (L.N., L.S., H.M.C., X.P., K.M.A., J.R., L.E.P., M.H., W.R.L., N.L., X.H.T.W.), Baylor College of Medicine, Houston, TX.
Circulation Research
|December 25, 2018
Summary
Researchers developed an atrial-specific adeno-associated virus (AAV) vector using the atrial natriuretic factor (ANF) promoter. This novel AAV9-ANF vector enables precise gene delivery to the atria for studying atrial diseases and developing gene therapies.
Area of Science:
- Cardiovascular Biology
- Gene Therapy
- Molecular Cardiology
Background:
- Adeno-associated virus (AAV) vectors are crucial for studying gene function in cardiac diseases.
- A lack of atrial-specific AAV vectors hinders research into atrial diseases and atrial fibrillation.
- The atrial natriuretic factor (ANF) promoter shows promise for driving atrial-specific gene expression.
Purpose of the Study:
- To establish an atrial-specific in vivo gene delivery platform using adeno-associated virus with the ANF promoter (AAV-ANF).
- To validate the specificity and efficiency of AAV9-ANF vectors for atrial gene delivery in mice.
Main Methods:
- Constructed adeno-associated virus serotype 9 (AAV9) vectors utilizing the atrial natriuretic factor (ANF) promoter.
- Evaluated AAV9-ANF-GFP expression in mouse hearts, comparing it with other promoters (cardiac troponin T, chicken β-actin).
- Utilized Rosa26mT/mG reporter mice to assess Cre-mediated recombination specificity in the atria after AAV9-ANF-Cre injection.
- Determined the dose-dependent relationship between AAV9 and cardiomyocyte transduction.
- Conducted proof-of-principle experiments for atrial-specific gene knockdown using conditional junctophilin-2 (JPH2) knockdown mice.
Main Results:
- AAV9-ANF vectors demonstrated strong, atrial-specific green fluorescent protein (GFP) expression in mouse hearts, with minimal ventricular expression.
- AAV9-ANF-Cre induced highly efficient and atrial-specific LoxP recombination in reporter mice, correlating positively with vector dose.
- Successful atrial-specific knockdown of junctophilin-2 (JPH2) was achieved, leading to abnormal calcium handling in atrial myocytes.
Conclusions:
- AAV9-ANF vectors provide efficient, dose-dependent, and atrial-specific gene expression after systemic delivery in mice.
- This novel vector system serves as a valuable tool for mechanistic studies and gene therapy development for atrial diseases.
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