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Intraclonal generation of antibody mutants in germinal centres

Abstract

THE generation and selection of somatic antibody mutants are key elements of acquired immunity, essential for the affinity maturation of antibody responses dependent on T cells. The mutants are generated through a mechanism that introduces point mutations at high rate into rearranged variable (V) region genes in the course of cell proliferation1,2. Their appearance coincides with the generation of germinal centres, which are characterized by oligoclonal B-cell proliferation3,4 and have been suggested to be the microen-vironment in which antibody mutants are generated5,6. We report here direct evidence for this hypothesis. Rearranged V-region genes were amplified from the genomic DNA of cells picked from individual germinal centres. The sequence analysis of these genes revealed that most represent cells of distinct B-cell clones which expanded locally, generating somatic antibody mutants at high rate. By contrast, antigen-induced proliferation of B cells at another site, periarteriolar lymphocyte sheath-associated foci, was not associated with somatic hypermutation.

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Jacob, J., Kelsoe, G., Rajewsky, K. et al. Intraclonal generation of antibody mutants in germinal centres. Nature 354, 389–392 (1991). https://doi.org/10.1038/354389a0

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