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Erythropoiesis is the process by which red blood cells (erythrocytes) are produced. During human foetal development, erythropoiesis first occurs in the yolk sac, then in the foetal liver and then, in the third trimester and after birth, in the bone marrow.
Zhou et al. demonstrate that bone marrow adipocytes, but not intraperitoneal adipocytes, express high levels of stem cell factor (SCF), which is essential for the regeneration of haematopoietic stem cells and haematopoiesis after irradiation.
The iron-regulated F-box protein FBXL5 regulates iron homeostasis by mediating the degradation of iron regulatory protein 2 (IRP2). Here the authors show that FBXL5 and its regulation of IRP2 are required for HSC self-renewal and reconstitution capability.
Determining the differentiation potential of stem and progenitor cells is essential for understanding their function, yet our ability to do so is limited by the restrictions of experimental assays. Based on single-cell functional and molecular profiling experiments, a new computational approach shows how lineage commitment may occur in human haematopoiesis.
Delineating the behaviour of haematopoietic stem cells (HSCs) in vivo has thus far proven challenging. Two studies in zebrafish and mouse models now track HSCs in vivo using fate mapping with multicolour approaches to provide further insights into clonal events that regulate blood development, HSC function and differentiation during homeostasis and stress conditions.