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Structural analysis of adeno-associated virus transduction circular intermediates
1Department of Anatomy and Cell Biology, College of Medicine, The University of Iowa, Iowa City 52242, USA.
Virology
|September 15, 1999
Summary
Recombinant adeno-associated virus (rAAV) circular DNA intermediates were analyzed. Chemical sequencing revealed mosaic ITR structures, proposing a model for their formation from viral DNA.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- Recombinant adeno-associated virus (rAAV) forms circular DNA intermediates in vivo.
- Previous analyses lacked detailed structural sequence data of these intermediates due to complex ITR structures.
Purpose of the Study:
- To investigate the precise structure of rAAV circular DNA intermediates.
- To elucidate the mechanisms of rAAV circular genome formation.
Main Methods:
- Isolation of seven circular intermediates from primary fibroblasts and Hela cells.
- Chemical sequencing of the inverted terminal repeat (ITR) arrays within these intermediates.
Main Results:
- Identified diverse circular intermediates with mosaic ITR elements and flanking D sequences.
- The predominant form resembled AAV double-D plasmids with one complete ITR and two D-region elements.
- Observed intermediately deleted ITR arrays containing multiple complete ITRs.
Conclusions:
- Proposed a model for rAAV circular intermediate formation via recombination/ligation of panhandle genome ends.
- Structural insights into ITRs are crucial for understanding rAAV genome replication and integration.