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Unité de Biologie Moléculaire du Gène, Institut Pasteur, Paris, France
We studied the kinetics of maturation of B cell progenitors in the mouse embryo, from day 15 of development to birth, both in liver and bone marrow. The analysis of Ig heavy chain rearrangements at different time points of late fetal development shows that oligoclonal patterns of VH-D-JH rearrangements are detected by day 15 in fetal liver. The pattern is polyclonal and diverse by day 17; however, 80% of the rearrangements are nonproductive. In bone marrow, the pattern of rearrangements is less diverse at birth, although the percentage of nonproductive rearrangements approaches adult bone marrow levels (35–40%). After day 17 in fetal liver, there is a sudden reversal in the percentage of nonproductive rearrangements that reaches 33% at day 19 (birth). Maturation of B cells, as measured by the fraction of surface Ig+ in total B220+ cells and the presence of N sequence additions in VH-D-JH joints, occurs in the marrow before fetal liver. These results demonstrate that the lymphopoietic environment in fetal liver and bone marrow of animals at the same stage of development is functionally distinct.
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