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J Gen Virol. 2000 Dec;81(Pt 12):2899-904.

T-cell line adaptation of human immunodeficiency virus type 1 strain SF162: effects on envelope, vpu and macrophage-tropism.

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  • 1The Wohl Virion Centre, Department of Immunology and Molecular Pathology, The Windeyer Institute of Medical Sciences, University College London, 46 Cleveland Street, London W1P 6DB, UK.


Changes in co-receptor-use by human immunodeficiency virus type 1 (HIV-1) strains are relatively rare in vivo. Here we describe two variants derived from the CCR5-using strain SF162, selected for replication in the C8166 T-cell line. Amino acid substitutions in the V3 loop conferred CXCR4-use; however, the loss of macrophage-tropism by one variant was due to a single mutation in the start codon of vpu. We discuss how V3 loop and vpu mutations acquired by replication in T-cell lines in vitro correlate with similar changes reported for primary isolates and HIV-1 sequences in vivo.

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