title: Shared idiotypes are expressed on mouse and human anti-DNA autoantibodies.
abstract: The expression of common idiotypes on human and mouse anti-DNA monoclonal autoantibodies made by hybridomas was examined by their competitive binding to anti-idiotype antibodies. Some murine autoantibodies inhibited the binding of a human anti-DNA autoantibody 16/6 to monoclonal or polyclonal anti-idiotypic antibodies. Another human antibody (134) was not inhibited in its binding to homologous anti-idiotypic antibodies. The expression of the human 16/6 idiotype on mouse antibodies was restricted to those that had a specificity similar to the 16/6 antibody itself, their major properties being that they reacted more strongly with single stranded DNA (ssDNA) than double stranded DNA (dsDNA). One mouse antibody expressing the 16/6 idiotype also bound weakly to RNA. The results imply structural similarities between the binding sites of the antibodies in the two species, and are consistent with evolutionary conservation of V genes coding for primitive ancestral antibodies that react with DNA and become diversified through somatic mutation.
mesh_terms: D000818:Animals; D000974:Antibodies, Antinuclear / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology; D000918:Antibody Specificity; D001323:Autoantibodies / Q000276:immunology*; D001666:Binding Sites, Antibody; D001667:Binding, Competitive; D004247:DNA / Q000276:immunology; D004277:DNA, Single-Stranded / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007130:Immunoglobulin Idiotypes; D051379:Mice
chemical_list: D000974:Antibodies, Antinuclear; D000911:Antibodies, Monoclonal; D001323:Autoantibodies; D004277:DNA, Single-Stranded; D007130:Immunoglobulin Idiotypes; D004247:DNA