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. 1994 Jan 18;91(2):514–518. doi: 10.1073/pnas.91.2.514

Somatic diversification in the heavy chain variable region genes expressed by human autoantibodies bearing a lupus-associated nephritogenic anti-DNA idiotype.

C Demaison 1, P Chastagner 1, J Thèze 1, M Zouali 1
PMCID: PMC42979  PMID: 8290556

Abstract

Monoclonal anti-DNA antibodies bearing a lupus nephritis-associated idiotype were derived from five patients with systemic lupus erythematosus (SLE). Genes encoding their heavy (H)-chain variable (VH) regions were cloned and sequenced. When compared with their closest VH germ-line gene relatives, these sequences exhibit a number of silent (S) and replacement (R) substitutions. The ratios of R/S mutations were much higher in the complementarity-determining regions (CDRs) of the antibodies than in the framework regions. Molecular amplification of genomic VH genes and Southern hybridization with somatic CDR2-specific oligonucleotide probes showed that the configuration of the VH genes corresponding to VH sequences in the nephritogenic antibodies is not present in the patient's own germ-line DNA, implying that the B-cell clones underwent somatic mutation in vivo. These findings, together with the characteristics of the diversity and junctional gene elements utilized to form the antibody, indicate that these autoantibodies have been driven through somatic selection processes reminiscent of those that govern antibody responses triggered by exogenous stimuli.

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Selected References

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