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Journal of Virology, February 1999, p. 1565-1572, Vol. 73, No. 2
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Evidence that the Human Foamy Virus Genome Is DNA

Shuyuarn F. Yu, Mark D. Sullivan, and Maxine L. Linial*

Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109

Received 23 December 1997/Accepted 13 November 1998

The genomes of the spumaviruses, of which human foamy virus (HFV) is the prototype, are very similar to those of other complex retroviruses. However, in some aspects of the viral replicative cycle, HFV more closely resembles pararetroviruses such as hepatitis B virus. Previous work indicated that HFV extracellular particles contain apparently full-length double-stranded DNA, as well as RNA. We have further characterized the amount of DNA in particles and the role that this DNA has in viral replication. Experiments with the reverse transcriptase inhibitor 3'-azido-3'-deoxythymidine (AZT) suggest that reverse transcription is largely complete before extracellular virus infects new cells. In addition, we have been able to show that DNA extracted from virions can lead to production of virus after transfection. Taken together, these data suggest that complete, or nearly complete, proviral-length DNA is present in viral particles and that this DNA is sufficient for new rounds of viral replication.

* Corresponding author. Mailing address: Div. of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N., A3-015, P.O. Box 19024, Seattle, WA 98109-1024. Phone: (206) 667-4442. Fax: (206) 667-5939. E-mail: mlinial{at}fhcrc.org.

Journal of Virology, February 1999, p. 1565-1572, Vol. 73, No. 2
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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