Virology, Nebraska Center for

 

Date of this Version

12-1990

Comments

Published in JOURNAL OF VIROLOGY, Dec. 1990, p. 6148-6153 Vol. 64, No. 12 0022-538X/90/126148-06$02.00/0 Copyright © 1990, American Society for Microbiology. Used by permission.

Abstract

Human immunodeficiency virus type 1 (HIV-1) strains isolated from the central nervous system (CNS) may represent a subgroup that displays a host cell tropism different from those isolated from peripheral blood and lymph nodes. One CNS-derived isolate, HIV-lSFl28A, which can be propagated efficiently in primary macrophage culture but not in any T-cell lines, was molecularly cloned and characterized. Recombinant viruses between HIV-lSF128A and the peripheral blood isolate HIV-lSF2 were generated in order to map the viral gene(s) responsible for the macrophage tropism. The env gene sequences of the two isolates are about 91.1% homologous, with variations scattered mainly in the hypervariable regions of gpl20. Recombinant viruses that have acquired the HIV-lSF128A env gene display HIV-lSFl28A tropism for macrophages. Furthermore, the gpl20 variable domains, V1, V2, V4, and V5, the CD4-binding domain, and the gp4l fusion domain are not directly involved in determining macrophage tropism.