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The role of clonal selection and somatic mutation in autoimmunity

Abstract

Polyclonal activation has been proposed as the reason that auto-antibodies are produced during autoimmune disease1–3. This model denies a role for specific antigen selection of B cells and predicts instead a multiclonal population of unmutated or randomly mutated autoantibodies. We have found that the genetic features and clonal composition of spontaneously derived immunoglobulin G (IgG) antiself-IgG (rheumatoid factor (RF)) autoantibodies derived from the autoimmune MRL/lpr mouse strain are inconsistent with both the predictions of this model and the actual outcome of experimental polyclonal activation4,5. Instead we have found that MRL/lpr RFs are oligoclonal or even monoclonal in origin. They harbour numerous somatic mutations which are distributed in a way that suggests immunoglobulin-receptor-depen-dent selection of these mutations. In this sense, the MRL/lpr RFs resemble antibodies elicited by exogenous antigens after secondary immunization6–8. The parallels suggest that, like secondary immune responses, antigen stimulation is important in the generation of MRL/lpr RFs.

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Shlomchik, M., Marshak-Rothstein, A., Wolfowicz, C. et al. The role of clonal selection and somatic mutation in autoimmunity. Nature 328, 805–811 (1987). https://doi.org/10.1038/328805a0

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