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J Virol, May 1998, p. 3773-3778, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Relative Replicative Fitness of
Zidovudine-Resistant Human Immunodeficiency Virus Type 1 Isolates
In Vitro
P. Richard
Harrigan,*
Stuart
Bloor,
and
Brendan
A.
Larder
Clinical Virology, Glaxo Wellcome Research
and Development, Stevenage, United Kingdom SG1 2NY
Received 23 October 1997/Accepted 2 February 1998
Replication of mixtures of two or more human immunodeficiency virus
type 1 (HIV-1) variants would be expected to result in the eventual
selection of the fittest virus due to Darwinian competition among the
variants. The relative proportions of known HIV-1 variants (which may
differ only by a single nucleotide from a standard "wild-type"
virus, HIV-1HXB2) in mixed viral cultures were quantified by analysis of automated sequence signals of reverse transcriptase PCR
products. With this method, the relative levels of replicative fitness
of several zidovudine (3'-azidothymidine)-resistant
HIV-1HXB2 variants were estimated under controlled in vitro
conditions by measuring the rate of change in the proportions of viral
variants as they replicated in cell cultures both in the presence and
in the absence of drug selection pressure. These variants were
engineered to contain commonly observed zidovudine resistance mutations
in the HIV-1 reverse transcriptase (M41L, K70R, T215Y, and M41L+T215Y). In the absence of zidovudine, all variants tested displayed reduced replicative fitness compared to wild-type HIV-1HXB2. The
order of relative fitness was wild type > K70R
T215Y = M41L+T215Y > M41L. Mixed cultures in the presence of zidovudine
showed a dose-dependent selection pressure against the wild-type virus which varied according to the resistance profile of each virus. The
information gathered from this approach provides insight into competition among multiple HIV-1 variants, which likely occurs in vivo
with drug selection pressure, and may be applicable in more complex
mathematical models for predicting the emergence of HIV-1 variants
after the initiation of antiretroviral therapy.
*
Corresponding author. Present address: BC Centre for
Excellence in HIV/AIDS, 1081 Burrard St., Vancouver, British Columbia, Canada V6Z 1Y6. Phone: 604 631 5281. Fax: 604 631 5464. E-mail: richard{at}hivnet.ubc.ca.

Present address: Virco UK, Unit 162A, The Cambridge Science Park,
Cambridge, United Kingdom.
J Virol, May 1998, p. 3773-3778, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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