The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1999/9/691/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 5, September 6, 1999 691-704

Somatic Mutation and Light Chain Rearrangement Generate Autoimmunity in Anti–single-stranded DNA Transgenic MRL/lpr Mice

Frederic Brarda, Michele Shannona, Eline Luning Prakb, Samuel Litwinc, and Martin Weigerta
a From the Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544
b Department of Pathology and Laboratory Medicine and the Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
c Fox Chase Cancer Center, Institute for Cancer Research, Philadelphia, Pennsylvania 19111

Correspondence to: Martin Weigert, Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544. Tel:609-258-2683 Fax:609-258-2205 E-mail:mweigert{at}molbio.princeton.edu.

Antibodies to single-stranded (ss)DNA are expressed in patients with systemic lupus erythematosus and in lupus-prone mouse models such as the MRL/Mp-lpr/lpr (MRL/lpr) strain. In nonautoimmune mice, B cells bearing immunoglobulin site-directed transgenes (sd-tgs) that code for anti-ssDNA are functionally silenced. In MRL/lpr autoimmune mice, the same sd-tgs are expressed in peripheral B cells and these autoantibodies gain the ability to bind other autoantigens such as double-stranded DNA and cell nuclei. These new specificities arise by somatic mutation of the anti-ssDNA sd-tgs and by secondary light chain rearrangement. Thus, B cells that in normal mice are anergic can be activated in MRL/lpr mice, which can lead to the generation of pathologic autoantibodies. In this paper, we provide the first direct evidence for peripheral rearrangement in vivo.

Key Words: anti-DNA, B cell tolerance, receptor editing, systemic lupus erythematosus, VH replacement


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