Human immunodeficiency virus type 1 variants with increased replicative capacity develop during the asymptomatic stage before disease progression (original) (raw)

Abstract

We examined the replicative properties of a series of sequential isolates and biological clones of human immunodeficiency virus type 1 (HIV-1) obtained from an individual who progressed from seroconversion to AIDS in approximately 5 years. HIV-1 isolated soon after seroconversion replicated slowly and to low levels in cultures of peripheral blood mononuclear cells; however, subsequent isolates obtained during asymptomatic infection showed a marked increase in replication kinetics. This was examined in more detail by using a panel of 35 biological clones of HIV-1 generated from sequential patient peripheral blood mononuclear cell samples. Each clone was evaluated for replication in primary macrophages and CD4+ T lymphocytes and for the ability to induce syncytium formation in MT-2 cell cultures. Consistent with earlier observations, we found that all of the clones isolated just after seroconversion were slowly replicating and non-syncytium inducing (NSI). However, NSI variants with increased replication kinetics in macrophages were identified soon thereafter. These variants preceded the appearance of NSI and syncytium-inducing variants, with rapid replication in both macrophages and CD4+ T lymphocytes. To determine whether changes in the rate of replication could be traced to the early stages of the virus life cycle, PCR assays were used to evaluate entry and reverse transcription of selected biological clones in macrophages and CD4+ T lymphocytes. We found there was no inherent block to entry or reverse transcription for the slowly replicating variants; however, this does not preclude the possibility that small differences in the rate of entry may account for larger differences in the replication kinetics over many cycles. Overall, our results demonstrate that rapidly replicating variants of HIV-1 emerge during the asymptomatic period in a patient who subsequently progressed clinically, suggesting that these variants may play an important role in HIV-1 pathogenesis.

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