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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Cell+Biol 2017 ; 19 (10): 1153-63 Nephropedia Template TP
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Life-long hematopoiesis is established by hundreds of precursors throughout mammalian ontogeny #MMPMID28920953
Ganuza M; Hall T; Finkelstein D; Chabot A; Kang G; McKinney-Freeman S
Nat Cell Biol 2017[Oct]; 19 (10): 1153-63 PMID28920953show ga
Current dogma asserts that mammalian life-long blood production is established by a small number of blood progenitors. However, this model is based on assays that require the disruption, transplantation and/or culture of embryonic tissues. Here, we used the sample-to-sample variance (SSV) of a multi-colored lineage trace reporter to assess the frequency of emerging life-long blood progenitors while avoiding the disruption, culture or transplantation of embryos. We find that approximately 719 Flk-1+ mesodermal precursors, 633 VE-Cadherin+ endothelial precursors and 545 Vav1+ nascent blood stem and progenitor cells emerge to establish the hematopoietic system at embryonic days (E) 7-E8.5, E8.5-E11.5 and E11.5-E14.5, respectively. We also determined that the spatio-temporal recruitment of endothelial blood precursors begins at E8.5 and ends by E10.5 and that many c-Kit+ clusters of newly specified blood progenitors in the aorta are polyclonal in origin. Our work illuminates the dynamics of the developing mammalian blood system during homeostasis.