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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.

Original publication

DOI

10.1016/j.stem.2013.08.012

Type

Journal article

Journal

Cell stem cell

Publication Date

11/2013

Volume

13

Pages

535 - 548

Addresses

Haematopoietic Stem Cell Laboratory, Lund Stem Cell Center, Lund University, 221 84 Lund, Sweden; Molecular Medicine and Gene Therapy, Lund Stem Cell Center, Lund University, 221 84 Lund, Sweden.

Keywords

Lymphocytes, Hematopoietic Stem Cells, Cells, Cultured, Myeloid Cells, Animals, Mice, Polymerase Chain Reaction, Cell Differentiation, Gene Expression Regulation, Developmental, Female, Male