title: PU.1 functions in a cell-autonomous manner to control the differentiation of multipotential lymphoid-myeloid progenitors.
abstract: Transcription factor PU.1 is required for the development of lymphoid and myeloid progenitors during fetal hematopoiesis. By generating chimeric animals using PU.1-/- ES cells or PU.1(-/-) hematopoietic progenitors, we demonstrate that PU.1 functions in an exclusively cell-autonomous manner to regulate the development of the lymphoid-myeloid system. Multipotential lymphoid-myeloid progenitors (AA4.1+, Lin-) are significantly reduced in PU.1(-/-) embryos and fail to differentiate into B lymphoid or myeloid cells in vitro. These results suggest that the lymphoid and myeloid lineages develop in the fetal liver from a common hematopoietic progenitor not shared with erythrocytes and megakaryocytes. Finally, the Ikaros gene is expressed in PU.1 mutant embryos, suggesting that PU.1 and Ikaros are independently required for specification of embryonic lymphoid cell fates.
authors.affiliation: Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, University of Chicago, IL 60637, USA.
authors.forename: E W
authors.initials: EW
authors.lastname: Scott
authors.forename: R C
authors.initials: RC
authors.lastname: Fisher
authors.forename: M C
authors.initials: MC
authors.lastname: Olson
authors.forename: E W
authors.initials: EW
authors.lastname: Kehrli
authors.forename: M C
authors.initials: MC
authors.lastname: Simon
authors.forename: H
authors.initials: H
authors.lastname: Singh
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects / Q000235:genetics; D002460:Cell Line; D002678:Chimera / Q000276:immunology; D004268:DNA-Binding Proteins; D004622:Embryo, Mammalian / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D017707:Erythrocyte Transfusion; D004920:Erythropoiesis / Q000235:genetics / Q000276:immunology; D005260:Female; D005786:Gene Expression Regulation / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects; D051740:Ikaros Transcription Factor; D008221:Lymphoid Tissue / Q000166:cytology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000502:physiology*; D011828:Radiation Chimera / Q000276:immunology; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics; D000099232:Proto-Oncogene Protein Spi-1
chemical_list: D004268:DNA-Binding Proteins; D051740:Ikaros Transcription Factor; D011518:Proto-Oncogene Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D000099232:Proto-Oncogene Protein Spi-1; C497238:Zfpn1a1 protein, mouse