title: Transcriptional profiling of human hematopoiesis during in vitro lineage-specific differentiation.
abstract: To better understand the transcriptional program that a ccompanies orderly lineage-specific hematopoietic differentiation, we performed serial oligonucleotide microarray analysis of human normal CD34+ bone marrow cells during lineage-specific differentiation. CD34+ bone marrow cells isolated from healthy individuals were selectively stimulated in vitro with the cytokines erythropoietin (EPO), thrombopoietin (TPO), granulocyte colony-stimulating factor (G-CSF), and granulocyte macrophage colony-stimulating factor (GM-CSF). Cells from each of the lineages were harvested after 4, 7, and 11 days of culture for expression profiling. Gene expression was analyzed by oligonucleotide microarrays (HG-U133A; Affymetrix, Santa Clara, CA). Experiments were done in triplicates. We identified 258 genes that are consistently upregulated or downregulated during the course of lineage-specific differentiation within each specific lineage (horizontal change). In addition, we identified 52 genes that contributed to a specific expression profile, yielding a genetic signature specific for successive stages of differentiation within each of the three lineages. Analysis of horizontal changes selected 21 continuously upregulated genes for EPO-induced differentiation (including GTPase activator proteins RAP1GA1 and ARHGAP8, which regulate small Rho GTPases), 21 for G-CSF-induced/GM-CSF-induced differentiation, and 91 for TPO-induced differentiation (including DLK1, of which the role in normal hematopoiesis is not defined). During the lineage-specific differentiation, 58 (erythropoiesis), 30 (granulopoiesis), and 37 (thrombopoiesis) genes were significantly downregulated, respectively. The expression of selected genes was confirmed by real-time polymerase chain reaction. Our data encompass the first extensive transcriptional profile of human hematopoiesis during in vitro lineage-specific differentiation.
authors.affiliation: Department of Hematology, Oncology and Transfusion Medicine, University Hospital Benjamin Franklin, Hindenburgdamm 30, 12203 Berlin, Germany.
authors.forename: Martina
authors.initials: M
authors.lastname: Komor
authors.forename: Saskia
authors.initials: S
authors.lastname: Güller
authors.forename: Claudia D
authors.initials: CD
authors.lastname: Baldus
authors.forename: Sven
authors.initials: S
authors.lastname: de Vos
authors.forename: Dieter
authors.initials: D
authors.lastname: Hoelzer
authors.forename: Oliver G
authors.initials: OG
authors.lastname: Ottmann
authors.forename: Wolf-K
authors.initials: WK
authors.lastname: Hofmann
mesh_terms: D018952:Antigens, CD34 / Q000032:analysis; D019070:Cell Lineage / Q000235:genetics*; D049109:Cell Proliferation; D002478:Cells, Cultured; D004920:Erythropoiesis / Q000235:genetics; D020869:Gene Expression Profiling; D006098:Granulocytes / Q000166:cytology; D006410:Hematopoiesis / Q000235:genetics*; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000276:immunology; D006801:Humans; D008533:Megakaryocytes / Q000166:cytology; D008954:Models, Biological; D020411:Oligonucleotide Array Sequence Analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D018952:Antigens, CD34