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Commitment of hematopoietic progenitor cells to B-lymphoid cell fate has been suggested to coincide with the development of PAX5-expressing B220(+)CD19(+) pro-B cells. We have used a transgenic reporter mouse, expressing human CD25 under the control of the B-lineage-restricted Igll1 (lambda5) promoter to investigate the lineage potential of early progenitor cells in the bone marrow. This strategy allowed us to identify a reporter expressing LIN(-)B220(-)CD19(-)CD127(+)FLT3(+)SCA1(low)KIT(low) population that displays a lack of myeloid and a 90% reduction in in vitro T-cell potential compared with its reporter-negative counterpart. Gene expression analysis demonstrated that these lineage-restricted cells express B-lineage-associated genes to levels comparable with that observed in pro-B cells. These data suggest that B-lineage commitment can occur before the expression of B220 and CD19.

Original publication




Journal article



Publication Date





1048 - 1055


Animals, Antigens, CD19, B-Lymphocytes, Bone Marrow Cells, Cell Lineage, Hematopoietic Stem Cells, Humans, Interleukin-2 Receptor alpha Subunit, Leukocyte Common Antigens, Mice, Mice, Inbred C57BL, Mice, Transgenic