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Journal of Virology, September 2002, p. 8958-8962, Vol. 76, No. 17
0022-538X/02/$04.00+0 DOI: 10.1128/JVI.76.17.8958-8962.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
and Mark A. Wainberg1,2*
McGill University AIDS Centre, Lady Davis Institute-Jewish General Hospital, Montreal, Quebec, Canada H3T 1E2,1 Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada H3A 2B42
Received 22 February 2002/ Accepted 30 May 2002
We previously constructed a series of simian immunodeficiency virus (SIV) mutants containing deletions within a 97-nucleotide region of the SIVmac239 untranslated region or leader sequence. However, as is common with live attenuated viruses, several of the mutants exhibited a moderate propensity for reversion. Since the M184V mutation in human immunodeficiency virus type 1 reverse transcriptase is associated with diminished fitness as well as lamivudine resistance, we introduced this substitution into several of our deletion mutants to determine its effects on viral replication and compensatory reversion. Our results indicate that M184V impaired viral fitness in pair-wise comparisons of mutants that contained or lacked this substitution. We also observed that M184V significantly impaired the potential for both compensatory mutagenesis and reversion in these mutants both in cell lines and in peripheral blood mononuclear cells.
Present address: Division of Clinical Sciences, University of Toronto, Toronto, Ontario, Canada M5S 1A8.
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