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Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.

Quantitative analysis of serum neutralization of human immunodeficiency virus type 1 from subtypes A, B, C, D, E, F, and I: lack of direct correlation between neutralization serotypes and genetic subtypes and evidence for prevalent serum-dependent infectivity enhancement.

L G Kostrikis, Y Cao, H Ngai, J P Moore, D D Ho
L G Kostrikis
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Y Cao
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H Ngai
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J P Moore
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D D Ho
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ABSTRACT

Human immunodeficiency virus type 1 (HIV-1) M group strains have been assigned to date to nine distinct genetic subtypes, designated A through I, according to phylogenetic analyses of nucleotide sequences of their env or gag genes. Whether there is any relationship between phylogenetic subtypes and the neutralization serotypes is not clear, yet defining the nature of any such relationship by mathematical means would be of major importance for the development of globally effective HIV-1 vaccines. We have therefore developed a quantitative method to analyze serum neutralization of HIV-1 isolates and to identify HIV-1 neutralization serotypes. This method involves calculations of the neutralization index, N(i), a newly defined parameter derived from plots generated from in vitro neutralization assays, calculations of pairwise serum-virus vector distances, and cluster analyses. We have applied this approach to analyze three independent neutralization matrices involving primary HIV-1 strains and sera from genetic subtypes A, B, C, D, E, F, and I. Detailed serum and HIV-1 isolate cluster analyses have shown that in general, the identified neutralization serotypes do not directly correlate with HIV-1 genetic subtypes. These results suggest that neutralization serotypes do not during natural HIV-1 infection are not governed by antibodies directed against simple epitopes within gp120 monomers. A significant proportion (28%) of 1,213 combinations of sera and HIV-1 isolates caused serum-dependent infectivity enhancement [negative N(i) values] rather than neutralization. We also noted that negative N(i) values tended to correlate better with certain HIV-1 isolates rather than with HIV-1-positive sera. Syncytium-inducing variants of HIV-1 were slightly more likely than non-syncytium-inducing variants to undergo serum-dependent infectivity enhancement, although the latter variants could clearly be susceptible to enhancement.

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Quantitative analysis of serum neutralization of human immunodeficiency virus type 1 from subtypes A, B, C, D, E, F, and I: lack of direct correlation between neutralization serotypes and genetic subtypes and evidence for prevalent serum-dependent infectivity enhancement.
L G Kostrikis, Y Cao, H Ngai, J P Moore, D D Ho
Journal of Virology Jan 1996, 70 (1) 445-458; DOI:

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Quantitative analysis of serum neutralization of human immunodeficiency virus type 1 from subtypes A, B, C, D, E, F, and I: lack of direct correlation between neutralization serotypes and genetic subtypes and evidence for prevalent serum-dependent infectivity enhancement.
L G Kostrikis, Y Cao, H Ngai, J P Moore, D D Ho
Journal of Virology Jan 1996, 70 (1) 445-458; DOI:
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