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J Virol. 1987 April; 61(4): 972-981

Replication of adeno-associated virus in synchronized cells without the addition of a helper virus.

ABSTRACT

We investigated the helper-independent replication of adeno-associated virus (AAV) in cells synchronized by pretreatment with hydroxyurea, reversal of polyamine depletion, or physical mitotic detachment. In Chinese hamster cells (OD4 line) treated with hydroxyurea prior to infection. AAV underwent a complete cycle of replication. Transfection of such cells with plasmid-cloned AAV DNAs also gave rise to infectious viral progeny. Synchronization of OD4 cells by reversal of polyamine depletion or mitotic detachment led to independent AAV DNA synthesis (and infectious viral progeny in the case of the former procedure), but these procedures were not as effective as hydroxyurea pretreatment. Independent AAV DNA synthesis was also detected in some other cell lines of Chinese hamster, human, and monkey origin treated with hydroxyurea prior to infection. The results demonstrate that, in contrast to previous notions, the AAV infectious process is not absolutely dependent upon the addition of a coinfecting helper virus.

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