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© Research
Publication : Cell stem cell

Lymphomyeloid contribution of an immune-restricted progenitor emerging prior to definitive hematopoietic stem cells

Published in Cell stem cell - 19 Sep 2013

Böiers C, Carrelha J, Lutteropp M, Luc S, Green JC, Azzoni E, Woll PS, Mead AJ, Hultquist A, Swiers G, Perdiguero EG, Macaulay IC, Melchiori L, Luis TC, Kharazi S, Bouriez-Jones T, Deng Q, Pontén A, Atkinson D, Jensen CT, Sitnicka E, Geissmann F, Godin I, Sandberg R, de Bruijn MF, Jacobsen SE

Link to Pubmed [PMID] – 24054998

Cell Stem Cell 2013 Nov;13(5):535-48

In jawed vertebrates, development of an adaptive immune-system is essential for protection of the born organism against otherwise life-threatening pathogens. Myeloid cells of the innate immune system are formed early in development, whereas lymphopoiesis has been suggested to initiate much later, following emergence of definitive hematopoietic stem cells (HSCs). Herein, we demonstrate that the embryonic lymphoid commitment process initiates earlier than previously appreciated, prior to emergence of definitive HSCs, through establishment of a previously unrecognized entirely immune-restricted and lymphoid-primed progenitor. Notably, this immune-restricted progenitor appears to first emerge in the yolk sac and contributes physiologically to the establishment of lymphoid and some myeloid components of the immune-system, establishing the lymphomyeloid lineage restriction process as an early and physiologically important lineage-commitment step in mammalian hematopoiesis.

http://www.ncbi.nlm.nih.gov/pubmed/24054998