title: Cell-type-specific profiling of gene expression and chromatin binding without cell isolation: assaying RNA Pol II occupancy in neural stem cells.
abstract: Cell-type-specific transcriptional profiling often requires the isolation of specific cell types from complex tissues. We have developed "TaDa," a technique that enables cell-specific profiling without cell isolation. TaDa permits genome-wide profiling of DNA- or chromatin-binding proteins without cell sorting, fixation, or affinity purification. The method is simple, sensitive, highly reproducible, and transferable to any model system. We show that TaDa can be used to identify transcribed genes in a cell-type-specific manner with considerable temporal precision, enabling the identification of differential gene expression between neuroblasts and the neuroepithelial cells from which they derive. We profile the genome-wide binding of RNA polymerase II in these adjacent, clonally related stem cells within intact Drosophila brains. Our data reveal expression of specific metabolic genes in neuroepithelial cells, but not in neuroblasts, and highlight gene regulatory networks that may pattern neural stem cell fates.
authors.affiliation: The Gurdon Institute and Department of Physiology, Development and Neuroscience, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK.
authors.forename: Tony D
authors.initials: TD
authors.lastname: Southall
authors.forename: Katrina S
authors.initials: KS
authors.lastname: Gold
authors.forename: Boris
authors.initials: B
authors.lastname: Egger
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Davidson
authors.forename: Elizabeth E
authors.initials: EE
authors.lastname: Caygill
authors.forename: Owen J
authors.initials: OJ
authors.lastname: Marshall
authors.forename: Andrea H
authors.initials: AH
authors.lastname: Brand
mesh_terms: D000818:Animals; D001921:Brain / Q000166:cytology / Q000378:metabolism*; D002469:Cell Separation; D002843:Chromatin / Q000235:genetics / Q000378:metabolism*; D019175:DNA Methylation; D004330:Drosophila / Q000201:enzymology / Q000235:genetics; D020869:Gene Expression Profiling / Q000379:methods*; D053263:Gene Regulatory Networks; D017344:Genes, Insect; D058953:Neural Stem Cells / Q000166:cytology / Q000201:enzymology*; D046569:Neuroepithelial Cells / Q000166:cytology / Q000201:enzymology; D011485:Protein Binding; D012319:RNA Polymerase II / Q000032:analysis* / Q000235:genetics; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014158:Transcription, Genetic
chemical_list: D002843:Chromatin; D012333:RNA, Messenger; D012319:RNA Polymerase II