Abstract
Previously, we and others have demonstrated a relation between the clinical course of human immunodeficiency virus type 1 (HIV-1) infection and biological properties of HIV-1 variants such as replication rate, syncytium-inducing (SI) capacity, and cytotropism. For the molecular analysis of the biological variability in these properties, we generated a panel of phenotypically distinct yet genetically highly homologous infectious molecular clones. These clones were derived from HIV-1 isolates, mostly recovered by direct clonal isolation, from a single individual in whom a transition from non-SI to SI isolates had been identified over time. Of 17 molecular clones tested, 8 were infectious. The clones exhibited differences in SI capacity and T-cell line tropism. Their phenotypes corresponded to those of their parental isolates, formally demonstrating that biological variability of HIV-1 isolates can be attributed to single molecular clones. With these clones we demonstrated that SI capacity and tropism for the H9 T-cell line, almost invariably coupled in primary HIV-1 isolates, are discernible properties. Also different requirements appeared to exist for H9 and Sup T1 cell line tropism. We obtained evidence that T-cell line tropism is not caused by differences in level of HIV-1 expression but most probably is restricted at the level of virus entry. Restriction mapping of four clones with divergent phenotypes revealed a high degree of nucleotide sequence homology (over 96.3%), indicating the usefulness of these clones for the tracking of genetic variability critical for differences in biological phenotype.
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Selected References
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