Production and characterization of novel recombinant adeno-associated virus replicative-form genomes: a eukaryotic source of DNA for gene transfer.
Conventional non-viral gene transfer uses bacterial plasmid DNA containing antibiotic resistance genes, cis-acting bacterial sequence elements, and prokaryotic methylation patterns that may adversely affect transgene expression and vector stability in vivo. Here, we describe novel replicative forms of a eukaryotic vector DNA that consist solely of an expression cassette flanked by adeno-associated virus (AAV) inverted terminal repeats. Extensive structural analyses revealed that this AAV-derived vector DNA consists of linear, duplex molecules with covalently closed ends (termed closed-ended, linear duplex, or "CELiD", DNA). CELiD vectors, produced in Sf9 insect cells, require AAV rep gene expression for amplification. Amounts of CELiD DNA produced from insect cell lines stably transfected with an ITR-flanked transgene exceeded 60 mg per 5 × 10(9) Sf9 cells, and 1-15 mg from a comparable number of parental Sf9 cells in which the transgene was introduced via recombinant baculovirus infection. In mice, systemically delivered CELiD DNA resulted in long-term, stable transgene expression in the liver. CELiD vectors represent a novel eukaryotic alternative to bacterial plasmid DNA.
Laboratory of Molecular Virology and Gene Therapy, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA.
Lina
L
Li
Emilios K
EK
Dimitriadis
Yu
Y
Yang
Juan
J
Li
Zhenhua
Z
Yuan
Chunping
C
Qiao
Cyriaque
C
Beley
Richard H
RH
Smith
Luis
L
Garcia
Robert M
RM
Kotin
D000818:Animals; D004247:DNA / Q000235:genetics*; D004274:DNA, Recombinant / Q000235:genetics*; D000229:Dependovirus / Q000235:genetics* / Q000502:physiology*; D005818:Genetic Engineering; D005822:Genetic Vectors / Q000235:genetics; D016679:Genome, Viral / Q000235:genetics*; D008297:Male; D051379:Mice; D061987:Sf9 Cells; D018411:Spodoptera; D013997:Time Factors; D014162:Transfection / Q000379:methods*; D014779:Virus Replication
D004274:DNA, Recombinant; D004247:DNA