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The relative infectiousness of laboratory and primary human immunodeficiency virus type 1 (HIV-1) variants was evaluated in in vitro cell cultures of peripheral blood mononuclear cells or MT-2 cells and in Hu-PBL-SCID mice. HIV(MN) and syncytium-inducing primary isolates were preferentially transmitted to cells in tissue culture. HIV(Ba-L) and non-syncytium-inducing (NSI) primary isolates were more infectious in Hu-PBL-SCID mice. Phylogenetic analysis of env sequences derived from the primary isolates, from the cell cultures, and from five Hu-PBL-SCID mice was performed by using methods designed for resolving differences among closely related sequence pairs. This analysis demonstrated preferential transmission of an evolutionarily related subset of NSI variants to Hu-PBL-SCID mice. The pattern of selective transmission of a restricted range of NSI variants that is observed in the clinical setting is maintained in Hu-PBL-SCID mice and not in tissue culture systems. The Hu-PBL-SCID mouse model system, when used with appropriate phylogenetic analysis methodologies, will be useful for identifying and characterizing the more infectious HIV-1 variants that should be targeted for vaccine development.

Selective transmission of human immunodeficiency virus type 1 variants to SCID mice reconstituted with human peripheral blood monoclonal cells