PMID- 9261406 OWN - NLM STAT- MEDLINE DCOM- 19970917 LR - 20200724 IS - 0022-538X (Print) IS - 1098-5514 (Electronic) IS - 0022-538X (Linking) VI - 71 IP - 9 DP - 1997 Sep TI - Identification and elimination of replication-competent adeno-associated virus (AAV) that can arise by nonhomologous recombination during AAV vector production. PG - 6816-22 AB - Adeno-associated virus (AAV) vector preparations are often contaminated with variable amounts of replication-competent AAV (rcAAV), which may influence the behavior of these vectors both in cultured cells and in animals. A packaging plasmid/vector plasmid system containing no significant homology and lacking the wild-type AAV p5 promoter was constructed to eliminate the production of wild-type AAV by recombination. Still, rcAAV was detected in vector produced by cotransfection of these plasmids at large scale. Sequence analysis revealed that nonhomologous recombination was responsible for the generation of these novel rcAAVs. A new AAV packaging plasmid carrying separate rep and cap expression cassettes in opposite transcriptional orientations was constructed. AAV vector preparations produced by using this packaging construct did not contain rcAAV. FAU - Allen, J M AU - Allen JM AD - Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA. FAU - Debelak, D J AU - Debelak DJ FAU - Reynolds, T C AU - Reynolds TC FAU - Miller, A D AU - Miller AD LA - eng GR - CA09229/CA/NCI NIH HHS/United States GR - DK47754/DK/NIDDK NIH HHS/United States GR - HL53570/HL/NHLBI NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - J Virol JT - Journal of virology JID - 0113724 RN - 0 (DNA-Binding Proteins) RN - 0 (Viral Proteins) RN - 137750-19-7 (rep proteins, Adeno-associated virus 2) RN - 9038-94-2 (Metallothionein) SB - IM MH - Animals MH - Capsid/genetics MH - Cell Line, Transformed MH - Cytomegalovirus/genetics MH - DNA-Binding Proteins/genetics MH - Dependovirus/genetics/*isolation & purification/physiology MH - *Genetic Vectors MH - Humans MH - Metallothionein/genetics MH - Mice MH - Recombination, Genetic MH - Transformation, Genetic MH - Tumor Cells, Cultured MH - Viral Proteins/genetics MH - *Virus Replication PMC - PMC191962 EDAT- 1997/09/01 00:00 MHDA- 1997/09/01 00:01 PMCR- 1997/09/01 CRDT- 1997/09/01 00:00 PHST- 1997/09/01 00:00 [pubmed] PHST- 1997/09/01 00:01 [medline] PHST- 1997/09/01 00:00 [entrez] PHST- 1997/09/01 00:00 [pmc-release] AID - 10.1128/JVI.71.9.6816-6822.1997 [doi] PST - ppublish SO - J Virol. 1997 Sep;71(9):6816-22. doi: 10.1128/JVI.71.9.6816-6822.1997.