Sequence analysis of anti-DNA antibodies is important in determining the molecular features which distinguish potentially pathogenic antibodies from those which are less likely to be pathogenic. Previous analysis of murine anti-DNA antibody sequences suggested that particular murine immunoglobulin genes are used preferentiallyto encode such antibodies and that somatic mutations to arginine, asparagine and lysine may be important in the creation of DNA binding sites.
In this paper, a systematic analysis of published human anti-DNA sequences shows no strong evidence for preferential usage of particular human VH or VL genes in anti-DNA antibodies. Somatic mutations in IgG and IgA antibodies are clustered in the complementarity determining regions (CDRs) due to the effect of antigen drive. This pocess contributes to an excess of arginine, asparagine and lysine residues in these CDRs, some of which are likely to play an important role in binding to DNA. Computer modeling and in-vitro expression experiments are likely to help define the roles played by these residues in antigen binding and pathogenicity more clearly.
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