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• W2085618698 abstract "The evolution of human immunodeficiency virus type 1 infection is associated with a shift in the target cell population, driven by variability in coreceptor utilization resulting from diversity in env. To elucidate the potential consequences of these changes for Env-mediated fusion over the course of AIDS, we examined the biological properties of serial viral isolates and determined coreceptor utilization by the products of env cloned from two individuals, followed from the detection of seroconversion throughout the course of their infection. One had a typical course, and the other had an accelerated progression. Early isolates were non-syncytium inducing, and the corresponding Env exclusively utilized CCR5, whereas Env from late phases of infection showed restricted utilization of CXCR4 in both patients. Env from subject SC24, who had a standard progression, demonstrated multitropism, manifested by utilization of CCR3, CXCR4, and CCR5 in the intervening period. In contrast, Env from patient SC51, who experienced early conversion to the syncytium-inducing phenotype, developed dualtropic coreceptor utilization of CCR5 and CXCR4. Genetic analysis of env from each isolate revealed that those with an X4 phenotype formed a distinct subcluster within each subject. Analysis of chimeras constructed from R5 and multispecific env from patient SC24 demonstrated that while the V3 domain played a dominant role in determining coreceptor utilization, sequences in the V4-V5 region also contributed to the latter phenotype. Immunoprecipitation experiments confirmed that the hybrid Env proteins were expressed at similar levels. These experiments demonstrate that progression from the R5 to X4 phenotype may occur through a multi- or dual-tropic intermediate and that multiple domains contribute to this process." @default.
• W2085618698 created "2016-06-24" @default.
• W2085618698 creator A5033917355 @default.
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• W2085618698 date "2000-12-15" @default.
• W2085618698 modified "2023-09-30" @default.
• W2085618698 title "Evolution of the Human Immunodeficiency Virus Type 1 Envelope during Infection Reveals Molecular Corollaries of Specificity for Coreceptor Utilization and AIDS Pathogenesis" @default.
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• W2085618698 doi "https://doi.org/10.1128/jvi.74.24.11858-11872.2000" @default.
• W2085618698 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/112469" @default.
• W2085618698 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11090186" @default.
• W2085618698 hasPublicationYear "2000" @default.
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