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• W2154459405 abstract "Anti-double-stranded DNA antibodies (anti-dsDNA) and antiphospholipid antibodies (APL) are important in the pathogenesis of systemic lupus erythematosus (SLE) and the antiphospholipid syndrome (APS) respectively. Not all anti-dsDNA or APL antibodies can cause clinical effects. Those that are particularly likely to cause tissue damage tend to be of IgG isotype and to possess particular binding properties. Rigorous statistical analysis of published sequences of human monoclonal anti-DNA and APL antibodies showed that IgG antibodies with binding properties characteristic of pathogenicity tend to have multiple somatic mutations in their variable regions. The distribution of these mutations suggests that they have been selected by antigen. This leads to accumulation of certain residues at the antigen-binding sites of these antibodies. Arginine residues are especially important. A computer-generated model of the pathogenic human monoclonal anti-DNA antibody B3 predicted that arginines in the heavy and light chain complementarity-determining regions (CDRs) would interact with dsDNA. We expressed cloned sequences encoding the B3 heavy and light chains in vitro to produce whole IgG. The cloned sequences of the heavy and light chains were manipulated to express a range of variant IgG antibodies. Binding assays on the expressed antibodies showed that altering specific arginine residues reduced binding to dsDNA in a way consistent with computer generated structural models. Changing the pattern of somatic mutations in the light chain altered binding to both dsDNA and histones, but in different ways. A single arginine-to-serine mutation in light-chain CDR1 of B3 reduced binding to both those antigens and may also have reduced the pathogenicity of the expressed antibodies in severe combined immunodeficiency (SCID) mice. Monoclonal human APL were expressed using the same system. Nineteen different heavy-light combinations were expressed. The ability to bind cardiolipin correlated well with the presence of exposed arginine residues in the heavy- and light-chain CDRs. The heavy chain of the pathogenic APL antibody IS4 contains four exposed arginines in CDR3. The results of mutagenesis studies suggested that two of these promote binding to cardiolipin whereas the other two have no such effect." @default.
• W2154459405 created "2016-06-24" @default.
• W2154459405 creator A5024237017 @default.
• W2154459405 date "2004-11-01" @default.
• W2154459405 modified "2023-10-16" @default.
• W2154459405 title "Autoantibodies, lupus and the science of sabotage" @default.
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• W2154459405 doi "https://doi.org/10.1093/rheumatology/keh354" @default.
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