Tuesday, June 29, 2010

Not a split decision for human hematopoiesis

Nature Immunology 11, 569 - 570 (2010) doi:10.1038/ni0710-569



Hematopoietic lineage schemes commonly show two distinct lymphoid and myeloid branches arising from the hematopoietic stem cell early during blood cell development. A new study of human hematopoiesis demonstrates that, similar to findings in mice, this split is not as dichotomous as is often presented.
Hematopoiesis is a remarkable developmental process in which mature lymphoid and myeloid cells with diverse functions are generated from a single hematopoietic stem cell (HSC). Seminar presentations on this topic frequently start with a slide indicating that the first step in HSC differentiation results in the generation of multipotent progenitors committed to either the lymphoid lineage or the myeloid lineage

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