title: Ontogeny of erythroid gene expression.
abstract: Erythroid ontogeny is characterized by overlapping waves of primitive and definitive erythroid lineages that share many morphologic features during terminal maturation but have marked differences in cell size and globin expression. In the present study, we compared global gene expression in primitive, fetal definitive, and adult definitive erythroid cells at morphologically equivalent stages of maturation purified from embryonic, fetal, and adult mice. Surprisingly, most transcriptional complexity in erythroid precursors is already present by the proerythroblast stage. Transcript levels are markedly modulated during terminal erythroid maturation, but housekeeping genes are not preferentially lost. Although primitive and definitive erythroid lineages share a large set of nonhousekeeping genes, annotation of lineage-restricted genes shows that alternate gene usage occurs within shared functional categories, as exemplified by the selective expression of aquaporins 3 and 8 in primitive erythroblasts and aquaporins 1 and 9 in adult definitive erythroblasts. Consistent with the known functions of Aqp3 and Aqp8 as H2O2 transporters, primitive, but not definitive, erythroblasts preferentially accumulate reactive oxygen species after exogenous H2O2 exposure. We have created a user-friendly Web site (http://www.cbil.upenn.edu/ErythronDB) to make these global expression data readily accessible and amenable to complex search strategies by the scientific community.
authors.affiliation: Department of Pediatrics, University of Rochester Medical Center, Center for Pediatric Biomedical Research, Rochester, NY 14642, USA.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Kingsley
authors.forename: Emily
authors.initials: E
authors.lastname: Greenfest-Allen
authors.forename: Jenna M
authors.initials: JM
authors.lastname: Frame
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Bushnell
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Malik
authors.forename: Kathleen E
authors.initials: KE
authors.lastname: McGrath
authors.forename: Christian J
authors.initials: CJ
authors.lastname: Stoeckert
authors.forename: James
authors.initials: J
authors.lastname: Palis
mesh_terms: D000818:Animals; D051398:Aquaporin 1 / Q000235:genetics; D051400:Aquaporin 3 / Q000235:genetics; D020346:Aquaporins / Q000235:genetics; D019070:Cell Lineage / Q000235:genetics; D002478:Cells, Cultured; D004900:Erythroblasts / Q000378:metabolism; D004912:Erythrocytes / Q000378:metabolism; D041905:Erythroid Cells / Q000378:metabolism*; D004920:Erythropoiesis / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D006413:Hematopoietic System / Q000166:cytology / Q000196:embryology / Q000254:growth & development; D051379:Mice; D008813:Mice, Inbred ICR; D017382:Reactive Oxygen Species / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors
chemical_list: C496021:Aqp1 protein, mouse; C496028:Aqp3 protein, mouse; C491638:Aqp9 protein, mouse; D020346:Aquaporins; D017382:Reactive Oxygen Species; C108330:aquaporin 8; D051398:Aquaporin 1; D051400:Aquaporin 3