title: The expression profile of purified Drosophila germline stem cells.
abstract: We developed a method to highly purify germline stem cells (GSCs) from the Drosophila ovary, one of the best understood types of adult stem cell. GSCs express variant isoforms of general transcriptional components, translation initiation factors, and several variant ribosomal proteins, including RpL22, a protein enriched in several mammalian stem cells. These novel isoforms may help regulate stem cell gene expression because a reversion assay indicated that at least four were specific for GSCs. By comparative analysis, we identify additional genes enriched in GSCs, including Psc, the Drosophila homolog of the Bmi-1 Polycomb group gene, as well as genes that may delay cytokinesis in pre-meiotic germ cells. By comparing GSCs arrested by BMP over-expression and bam mutation, we hypothesize that mRNA utilization is modulated in differentiating GSC daughters. Our findings suggest that Drosophila and mammalian stem cells utilize at least two regulatory mechanisms in common.
authors.affiliation: Howard Hughes Medical Institute Research Laboratories, Department of Embryology, Carnegie Institution, Baltimore, MD 21210, USA.
authors.forename: Toshie
authors.initials: T
authors.lastname: Kai
authors.forename: Dianne
authors.initials: D
authors.lastname: Williams
authors.forename: Allan C
authors.initials: AC
authors.lastname: Spradling
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002478:Cells, Cultured; D048749:Cytokinesis / Q000502:physiology; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics; D004330:Drosophila / Q000235:genetics / Q000378:metabolism*; D029721:Drosophila Proteins / Q000096:biosynthesis / Q000235:genetics; D004734:Energy Metabolism; D005260:Female; D020869:Gene Expression Profiling; D005838:Genotype; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D010053:Ovary / Q000166:cytology / Q000378:metabolism; D010063:Ovum / Q000166:cytology / Q000378:metabolism; D063150:Polycomb Repressive Complex 1; D014176:Protein Biosynthesis; D020033:Protein Isoforms / Q000096:biosynthesis / Q000235:genetics; D016601:RNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics; D012269:Ribosomal Proteins / Q000096:biosynthesis / Q000235:genetics; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D020033:Protein Isoforms; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins; C489368:RpL22 protein, Drosophila; D014157:Transcription Factors; C071050:Psc protein, Drosophila; D063150:Polycomb Repressive Complex 1