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J. Exp. Med.,
Volume 189, Number 1, January 4, 1999 75-88
By
From the Institute for Genetics, University of Cologne,Weyertal 121, 50931 Cologne, Germany
In mouse mutants incapable of expressing µ chains, V
J
joints are detected in the CD43+ B
cell progenitors. In agreement with these earlier results, we show by a molecular single cell
analysis that 4-7% of CD43+ B cell progenitors in wild-type mice rearrange immunoglobulin (Ig)
genes before the assembly of a productive VHDHJH joint. Thus, µ chain expression is not
a prerequisite to Ig
light chain gene rearrangements in normal development. Overall, ~15%
of the total CD43+ B cell progenitor population carry Ig
gene rearrangements in wild-type
mice. Together with the results obtained in the mouse mutants, these data fit a model in which
CD43+ progenitors rearrange IgH and Ig
loci independently, with a seven times higher frequency in the former. In addition, we show that in B cell progenitors V
J
joining rapidly initiates
chain expression, irrespective of the presence of a µ chain.
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