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J. Exp. Med.,
Volume 188, Number 7, October 5, 1998 1231-1238
By

From the * National Jewish Medical and Research Center, Division of Basic Sciences, Department of
Pediatrics, Denver, Colorado 80206; and the Allelic exclusion is established in development through a feedback mechanism in which the assembled immunoglobulin (Ig) suppresses further V(D)J rearrangement. But Ig expression
sometimes fails to prevent further rearrangement. In autoantibody transgenic mice, reactivity of
immature B cells with autoantigen can induce receptor editing, in which allelic exclusion is
transiently prevented or reversed through nested light chain gene rearrangement, often resulting in altered B cell receptor specificity. To determine the extent of receptor editing in a normal, non-Ig transgenic immune system, we took advantage of the fact that
University of Colorado Health Science Center,
Department of Immunology, Denver, Colorado 80220
light chain genes
usually rearrange after
genes. This allowed us to analyze
loci in IgM
+ cells to determine
how frequently in-frame
genes fail to suppress
gene rearrangements. To do this, we analyzed recombined V
J
genes inactivated by subsequent recombining sequence (RS) rearrangement. RS rearrangements delete portions of the
locus by a V(D)J recombinase-dependent mechanism, suggesting that they play a role in receptor editing. We show that RS
recombination is frequently induced by, and inactivates, functionally rearranged
loci, as
nearly half (47%) of the RS-inactivated V
J
joins were in-frame. These findings suggest that
receptor editing occurs at a surprisingly high frequency in normal B cells.
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