0000000000997412

AUTHOR

Ulrike Mettler

showing 2 related works from this author

Connecting temporal identity to mitosis: the regulation of Hunchback in Drosophila neuroblast lineages.

2006

Both in vertebrates and invertebrates, neural stem cells generate different cell types at different times during development. It has been suggested that this process depends on temporal identity transitions of neural progenitors, but the underlying mechanism has not been resolved, yet. Recently, Drosophila neuroblasts (NBs) have been shown to be an excellent model system to investigate this subject. Here, changes in temporal identity are regulated by sequential and transient expression of transcription factors in the NB, such as Hunchback (Hb) and Kruppel (Kr). The temporal expression profile is maintained in the progeny. Hb is expressed first and thus defines the earliest identity in a giv…

Retinal Ganglion CellsCell typeReceptors SteroidKruppel-Like Transcription FactorsDown-RegulationMitosisNerve Tissue ProteinsBiologyCell fate determinationKrüppelNeuroblastAnimalsDrosophila ProteinsNuclear export signalMolecular BiologyMitosisTranscription factorGeneticsNeuronsModels GeneticNuclear ProteinsCell DifferentiationCell BiologyNeural stem cellDNA-Binding ProteinsProtein BiosynthesisDrosophilaDevelopmental BiologyTranscription FactorsCell cycle (Georgetown, Tex.)
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Timing of identity: spatiotemporal regulation of hunchback in neuroblast lineages of Drosophila by Seven-up and Prospero.

2006

Neural stem cells often generate different cell types in a fixed birth order as a result of temporal specification of the progenitors. In Drosophila, the first temporal identity of most neural stem cells(neuroblasts) in the embryonic ventral nerve cord is specified by the transient expression of the transcription factor Hunchback. When reaching the next temporal identity, this expression is switched off in the neuroblasts by seven up (svp) in a mitosis-dependent manner, but is maintained in their progeny (ganglion mother cells). We show that svpmRNA is already expressed in the neuroblasts before this division. After mitosis, Svp protein accumulates in both cells, but the downregulation of h…

Cell typeReceptors Steroidanimal structuresTranscription GeneticMitosisNerve Tissue ProteinsNeuroblastAnimalsDrosophila ProteinsCell LineageProgenitor cellMolecular BiologyMitosisGeneticsNeuronsbiologyStem CellsfungiGene Expression Regulation DevelopmentalNuclear ProteinsProsperobiology.organism_classificationEmbryonic stem cellNeural stem cellCell biologyDNA-Binding ProteinsDrosophila melanogasterGanglion mother cellDevelopmental BiologyTranscription FactorsDevelopment (Cambridge, England)
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