title: GATA-1 converts lymphoid and myelomonocytic progenitors into the megakaryocyte/erythrocyte lineages.
abstract: GATA-1 is an essential transcription factor for megakaryocyte and erythrocyte (MegE) development. Here we show that hematopoietic progenitors can be reprogrammed by the instructive action of GATA-1. Enforced expression of GATA-1 in hematopoietic stem cells led to loss of self-renewal activity and the exclusive generation of MegE lineages. Strikingly, ectopic GATA-1 reprogrammed common lymphoid progenitors as well as granulocyte/monocyte (GM) progenitors to differentiate into MegE lineages, while inhibiting normal lymphoid or GM differentiation. GATA-1 upregulated critical MegE-related transcription factors such as FOG-1 and GATA-2 in lymphoid and GM progenitors, and their MegE development did not require "permissive" erythropoietin signals. Furthermore, GATA-1 induced apoptosis of proB and myelomonocytic cells, which could not be prevented by enforced permissive Bcl-2 or myeloid cytokine signals. Thus, GATA-1 specifically instructs MegE commitment while excluding other fate outcomes in stem and progenitor cells, suggesting that regulation of GATA-1 is critical in maintaining multilineage homeostasis.
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism*; D050981:Erythroid-Specific DNA-Binding Factors; D050982:GATA1 Transcription Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism; D008533:Megakaryocytes / Q000378:metabolism*; D051379:Mice; D008822:Mice, Transgenic; D023461:Myeloid Progenitor Cells / Q000378:metabolism*; D009687:Nuclear Proteins / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D050981:Erythroid-Specific DNA-Binding Factors; D050982:GATA1 Transcription Factor; C494689:Gata1 protein, mouse; D009687:Nuclear Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D014157:Transcription Factors; C107310:Zfpm1 protein, mouse; D016178:Granulocyte-Macrophage Colony-Stimulating Factor