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Journal of Virology, November 1998, p. 8568-8577, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Circular Intermediates of Recombinant Adeno-Associated Virus Have Defined Structural Characteristics Responsible for Long-Term Episomal Persistence in Muscle Tissue

Dongsheng Duan, Prerna Sharma, Jusan Yang, Yongping Yue, Lorita Dudus, Yulong Zhang, Krishna J. Fisher, and John F. Engelhardt*

Department of Anatomy and Cell Biology and Department of Internal Medicine, University of Iowa Medical Center, Iowa City, Iowa

Received 20 May 1998/Accepted 16 July 1998

Adeno-associated viral (AAV) vectors have demonstrated great utility for long-term gene expression in muscle tissue. However, the mechanisms by which recombinant AAV (rAAV) genomes persist in muscle tissue remain unclear. Using a recombinant shuttle vector, we have demonstrated that circularized rAAV intermediates impart episomal persistence to rAAV genomes in muscle tissue. The majority of circular intermediates had a consistent head-to-tail configuration consisting of monomer genomes which slowly converted to large multimers of >12 kbp by 80 days postinfection. Importantly, long-term transgene expression was associated with prolonged (80-day) episomal persistence of these circular intermediates. Structural features of these circular intermediates responsible for increased persistence included a DNA element encompassing two viral inverted terminal repeats (ITRs) in a head-to-tail orientation, which confers a 10-fold increase in the stability of DNA following incorporation into plasmid-based vectors and transfection into HeLa cells. These studies suggest that certain structural characteristics of AAV circular intermediates may explain long-term episomal persistence with this vector. Such information may also aid in the development of nonviral gene delivery systems with increased efficiency.

* Corresponding author. Mailing address: Department of Anatomy and Cell Biology, University of Iowa School of Medicine, 51 Newton Rd., Room 1-101 BSB, Iowa City, IA 52242. Phone: (319) 335-7753. Fax: (319) 335-7198. E-mail: john-engelhardt{at}uiowa.edu.

Journal of Virology, November 1998, p. 8568-8577, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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