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DNA-Minus Temperature-Sensitive Mutants of Adenovirus Type 5 Help Adenovirus-Associated Virus Replication

^* National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland 20014
Department of Microbiology, College of Physicians and Surgeons, Columbia University, New York, New York 10032

ABSTRACT

Efficient potentiation of adenovirus-associated viruses (AAV) replication occurs in coinfections with either of two DNA-minus temperature-sensitive mutants of adenovirus type 5 (Ad5), ts125 and ts149. The helper activity of these mutants does not result from leakiness. At the nonpermissive temperature (39.5 C) there was little or no detectable adenovirus DNA synthesis, and only a relatively low level of adenovirus transcription was observed. However, the synthesis of AAV DNA and RNA and the yield of infectious AAV were comparable in amounts to those found when wild-type Ad5 was the helper. Furthermore, an apparent lag in the initiation of AAV transcription after the onset of AAV DNA synthesis was seen in coinfections with both wild type or ts125. These findings strongly suggest that the adenovirus factor(s) required for AAV multiplication is produced early in the adenovirus cycle. In addition, it is likely that if AAV multiplication is linked to adenovirus DNA replication, this requirement does not include all factors directly needed for adenovirus DNA synthesis.

This article has been cited by other articles:

• Ward, P., Dean, F. B., O'Donnell, M. E., Berns, K. I. (1998). Role of the Adenovirus DNA-Binding Protein in In Vitro Adeno-Associated Virus DNA Replication. J. Virol. 72: 420-427 [Abstract] [Full Text]