Examination of 19 S and 7 S anti-alpha(1 leads to 3) dextran (Dex) antibodies by serological assays and isoelectric focusing (IEF) has revealed substantial variation of idiotypic and spectrotypic expression between individuals of the same genotype. 7 S antibodies appeared to be more heterogeneous than 19 S by both methods. A strong, but complex, association was found between the IEF patterns of 19 S and 7 S anti-Dex antibodies and their expression of the idiotypic determinant(s) common to both the M104 and J558 dextran-binding myeloma proteins. However, no such relationship was found between the IEF pattern and the expression of idiotypic determinant(s) unique to the M104 myeloma protein. Rather, indistinguishable spectrotypes from different individuals have widely differing levels of expression of the determinant. In addition, this determinant(s) may be present on different spectrotypes of the same isotype. Both the M104 and J558-specific idiotypes were found on antibodies of the IgG3 subclass as well as in pools containing predominantly the IgG2a subclass. These data confirm and extend the picture of substantial structural variation among the antibodies comprising a response of restricted heterogeneity.
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