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. 1992 Jul;66(7):4622–4627. doi: 10.1128/jvi.66.7.4622-4627.1992

Evolution of the V3 envelope domain in proviral sequences and isolates of human immunodeficiency virus type 1 during transition of the viral biological phenotype.

C L Kuiken 1, J J de Jong 1, E Baan 1, W Keulen 1, M Tersmette 1, J Goudsmit 1
PMCID: PMC241280  PMID: 1602564

Abstract

The third variable domain (V3) of the envelope gene of human immunodeficiency virus type 1 contains a major neutralization epitope and determinants of syncytium-inducing (SI) capacity and replication rate (reviewed by J. P. Moore and P. L. Nara, AIDS Suppl. 2:S21-S33, 1991). Sequences were generated from DNA of samples taken 3 months apart over a period of 24 and 30 months from peripheral blood mononuclear cells (PBMC) of two individuals, both before and after cocultivation with uninfected donor PBMC. The isolated virus shifted from the non-syncytium-inducing (NSI) phenotype to the SI phenotype during the study period. This shift was associated with distinct changes in the V3 domain in both patients. The association of the phenotype shift with the V3 sequence changes was confirmed by construction of viruses with chimeric V3 loops. The shift from NSI- to SI-associated V3 variants was also seen in the uncultured PBMC of both patients, but not until 3 and 9 months after the detection of SI virus in culture. In the samples of uncultured PBMC DNA, several subgroups of sequences were found, indicating that the process of evolution may not be gradual and that several distinct populations can coexist. The paucity of intermediate sequences indicated that strong selection pressure was exerted on this part of the envelope. The early emergence of disease-associated SI variants in cultured material indicates that virus culture may have relevance for the in vivo situation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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