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Two BALB/c mice were immunized with serovar C Chlamydia trachomatis elementary bodies, and 63 hybridomas producing monoclonal antibodies to C. trachomatis were recovered. Eight hybridomas which were specific for an identical peptide epitope (AGLQND) in serovar C major outer membrane protein variable domain I were identified. Detailed immunochemical study of the antigen-antibody interaction and genetic characterization of the antibody variable-region gene sequences showed that distinct B-cell clonal lineages were elicited by the epitope sequence. Since each antibody had a distinct pattern of fine specificity for recognition of the epitope and displayed different degrees of cross-reactivity with a related serovar (serovar A), we conclude that B-cell recognition of an immunodominant neutralization epitope can be pleiotropic. Differences in B-cell recognition of a neutralization epitope may delay the emergence by mutation of antigenic-drift variants of the C. trachomatis major outer membrane protein.

Antibody recognition of a neutralization epitope on the major outer membrane protein of Chlamydia trachomatis