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. 1990 Aug;64(8):3654–3660. doi: 10.1128/jvi.64.8.3654-3660.1990

Differences in the basal activity of the long terminal repeat determine different replicative capacities of two closely related human immunodeficiency virus type 1 isolates.

E I Golub 1, G G Li 1, D J Volsky 1
PMCID: PMC249658  PMID: 2370677

Abstract

Two human immunodeficiency virus type 1 (HIV-1) variants derived from a single parental isolate were found to differ substantially in their ability to replicate in CD4-positive cells. Using transient chloramphenicol acetyltransferase expression assays, we show that the long terminal repeat (LTR) of the better-replicating virus has significantly higher capacity than that of the companion virus to direct gene expression in T cells. Sequence data and site-specific mutagenesis experiments demonstrate that the higher LTR activity of the better-replicating HIV-1 is due to a combined effect of two mutations: (i) a point mutation in position -94 (relative to the transcriptional start site), which is located between the two subunits of the HIV-1 enhancer, and (ii) a duplication of 24 base pairs in positions -128 to -151, which was not previously known to be involved in any regulatory function. The presence of these mutations increases the basal level of the LTR-driven gene expression and does not influence the degree of induction caused by the viral tat gene product or by cell activation. Reciprocal exchange of LTRs between the respective viral DNAs results in a change of a recombinant virus replication pattern consistent with the activity of the particular LTR. These experiments suggest that the HIV-1 LTR is one of the sites which determines the functional heterogeneity of HIV-1.

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Selected References

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