title: A cis-acting element that directs circular adeno-associated virus replication and packaging.
abstract: A novel pathway of adeno-associated virus (AAV) replication marked by the assembly of circular monomer duplex intermediates (cAAV) has been recently discovered. In the present report we identify a single AD domain of the inverted terminal repeat as a minimal origin of cAAV replication. A small internal palindrome (BB'), necessary for optimal Rep-inverted terminal repeat interaction, does not contribute to the efficiency of cAAV replication, while the terminal resolution site is an essential cis-acting element. Furthermore, recombinant cAAV vectors that encompass only the AD domain replicate exclusively in a circular form and no detectable linear duplex replicative intermediates are generated, suggesting that both pathways of AAV replication are independent and can be separated. In addition, we show that cAAVs are efficient templates for encapsidation of single-stranded DNA genomes, an observation that assigns a biological role for these novel replication species. Together, these findings shed new light on the current model of AAV replication and packaging.
authors.affiliation: Laboratory of Neurobiology and Behavior, The Rockefeller University, Weill Medical College of Cornell University, 525 East 68th Street, New York, NY 10021, USA.
authors.forename: Sergei
authors.initials: S
authors.lastname: Musatov
authors.forename: Jill
authors.initials: J
authors.lastname: Roberts
authors.forename: Donald
authors.initials: D
authors.lastname: Pfaff
authors.forename: Michael
authors.initials: M
authors.lastname: Kaplitt
mesh_terms: D001483:Base Sequence; D004279:DNA, Viral / Q000096:biosynthesis; D000229:Dependovirus / Q000235:genetics* / Q000502:physiology; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D020079:Terminal Repeat Sequences; D019065:Virus Assembly; D016662:Virus Integration; D014779:Virus Replication
chemical_list: D004279:DNA, Viral