A cis-acting element that directs circular adeno-associated virus replication and packaging

Sergei Musatov, Jill Roberts, Donald Pfaff, Michael Kaplitt

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

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.

Original languageEnglish
Pages (from-to)12792-802
Number of pages11
JournalJournal of Virology
Volume76
Issue number24
DOIs
StatePublished - Dec 2002

Keywords

  • Base Sequence
  • DNA, Viral/biosynthesis
  • Dependovirus/genetics
  • Molecular Sequence Data
  • Promoter Regions, Genetic
  • Terminal Repeat Sequences
  • Virus Assembly
  • Virus Integration
  • Virus Replication

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