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By
§
§
From the * Basel Institute for Immunology, CH-4005 Basel, Switzerland; CD19+CD10+ human B lineage bone marrow cells were separated into cycling or resting cells,
which differ in their expression of CD34, VpreB, recombination activating gene (RAG-1), and
terminal deoxynucleotidyl transferase (TdT). Polymerase chain reaction analyses developed for
DHJH and V
Centro de Investigaciones
Biologicas, E-28006 Madrid, Spain; and § Department of Medicine, Alcala University, E-28871
Madrid, Spain
J
, V
J
K(de) and V
K(de) rearrangements with DNA of single cells and a comparison with B lineage cell development in mouse bone marrow, allow to delineate the human B
lymphocyte pathway of development as follows: CD34+VpreB+RAG-1+TdT+, DHJH-rearranged,
L germline cycling pre-B I cells
CD34
VpreB+µH chain+ (pre-B receptor+)
RAG-1
TdT
, VHDHJH-rearranged,
L germline, cycling pre-B II cells
CD34
VpreB
, intracytoplasmic µH chain+ (pre-B receptor
) RAG-1+/
TdT
, VHDHJH-rearranged, mainly
L
germline cycling pre-B II cells
CD34
VpreB
intracytoplasmic µH chain+, RAG-1+TdT
,
VHDHJH-rearranged, V
J
-rearranged, IgM
, resting pre-B II cells CD34+VpreB
, sIgM+,
RAG-1+TdT
, VHDHJH- and V
J
-rearranged IgM+ immature B cells
CD34
, CD10
,
sIgM+/sIgD+ mature B cells. This order, for the first time established for human B lineage
cells, shows striking similarities with that established for mouse B lineage cells in bone marrow.
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