Factors influencing helper-independent adeno-associated virus replication.
The inability of Adeno-Associated Virus (AAV) to replicate on its own is a strong argument in favor of the use of recombinant AAV vectors for in vivo gene transfer. However, some previous studies suggested that AAV may become replication competent in cells exposed to a genotoxic stress even in the absence of co-infection with a helper virus. To comprehensively explore this phenomenon, we examined AAV genome replication in several human cell lines exposed to different genotoxic conditions. We found that all treatments induced only negligible levels of AAV replication never exceeding ten fold above background. Further investigation indicated that induction of helper-independent AAV replication relied on the synergistic contribution of several extrinsic factors linked to the origin of the cell line and the quality of the AAV preparation. These results further support the notion that helper independent AAV replication cannot occur at significant levels in vivo.
INSERM U758, ENS Lyon, 46 Allée d'Italie, Lyon 69007, France.
Armel
A
Nicolas
Nelly
N
Jolinon
Nathalie
N
Alazard-Dany
Véronique
V
Barateau
Alberto L
AL
Epstein
Anna
A
Greco
Hildegard
H
Büning
Anna
A
Salvetti
D002460:Cell Line; D004249:DNA Damage; D000229:Dependovirus / Q000502:physiology*; D006378:Helper Viruses / Q000502:physiology; D006801:Humans; D014779:Virus Replication