Journal
JOURNAL OF EXPERIMENTAL MEDICINE
Volume 203, Issue 3, Pages 675-687Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20052444
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Funding
- NIAID NIH HHS [T32 AI007492, AI40946, AI26782, R01 AI026782, R56 AI026782, R01 AI040946, AI07492] Funding Source: Medline
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We describe here three CD19(-) B cell precursor populations in mouse bone marrow identified using 12-color flow cytometry. Cell transfer experiments indicate lineage potentials consistent with multilineage progenitor (MLP), common lymphoid progenitor (CLP), and B lineage-restricted pre-pro-B (Fr. A), respectively. However, single cell in vitro assays reveal lineage plasticity: lymphoid/myeloid lineage potential for CLP and B/T lineage potential for Fr. A. Despite myeloid potential, recombination activating gene 2 reporter activation is first detected at low levels in most MLP cells, with 95% of CLPs showing 10-fold increased levels. Furthermore, single cell analysis shows that half of CLP and 90% of Fr. A cells contain heavy chain DJ rearrangements. These data, together with expression profiles of lineage-specific genes, demonstrate progressive acquisition of B lineage potential and support an asynchronous view of early B cell development, in which B lineage specification initiates in the MLP/CLP stage, whereas myeloid potential is not lost until the pre-pro-B (Fr. A) stage, and B/T lymphoid plasticity persists until the CD19(+) pro-B stage. Thus, MLP, CLP, and Fr. A represent progressively B lineage-specified stages in development, before the CD19(+) B lineage-committed pro-B stage.
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