Abstract
We have previously used a panel of quantitative and qualitative serological assays to define a lengthy and complex maturation of envelope-specific antibody responses in monkeys experimentally infected with attenuated simian immunodeficiency virus (SIV) that is closely associated with the temporal development of enduring and protective immunity to experimental virus challenge. To elucidate in more detail the changes in antibody specificity associated with this maturation, we describe here 'domain-specific' serological studies to characterize the evolution of antibody responses to defined linear determinants of the SIV envelope protein. The results of these studies reveal for the first time distinguishing differences in the evolution of antibody populations to distinct envelope peptide segments, as determined by measurements of antibody titer and avidity, indicating different patterns of antibody maturation to distinct linear envelope antigenic determinants. Thus, these data demonstrate the potential for domain-specific serology to produce a high-resolution characterization of SIV-specific antibody responses that can be used to evaluate experimental vaccine responses and to identify potential immune correlates of protection.
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