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. 1992 May 15;89(10):4673–4677. doi: 10.1073/pnas.89.10.4673

In vitro replication of adeno-associated virus DNA.

G Hong 1, P Ward 1, K I Berns 1
PMCID: PMC49145  PMID: 1316616

Abstract

An in vitro assay for adeno-associated virus (AAV) DNA replication has been developed. The substrate is a plasmid containing the duplex form of AAV DNA in pBR322. The AAV insert is excised or rescued from the plasmid by extracts of uninfected cells. Replication was assayed by production of full-length excised AAV DNA resistant to Dpn I digestion. The following results were obtained. (i) Only extracts of cells coinfected with AAV and adenovirus replicated the excised insert. (ii) Density label experiments showed semiconservative replication. (iii) Only the excised AAV insert was replicated; pBR322 sequences were not. (iv) Replication was dependent on the presence of the AAV terminal repeat. (v) If the terminal 55 bases were deleted from both ends of the AAV insert, no rescue took place: replication occurred and both AAV and pBR322 sequences were replicated. We conclude that the AAV terminal repeat is essential for DNA replication but that under some conditions an initiation mechanism that does not involve hairpin priming may be used.

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