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A comparative analysis of the genomes of Drosophila melanogaster, Caenorhabditis elegans, and Saccharomyces cerevisiae-and the proteins they are predicted to encode-was undertaken in the context of cellular, developmental, and evolutionary processes. The nonredundant protein sets of flies and worms are similar in size and are only twice that of yeast, but(More)
During Drosophila neuroblast lineage development, temporally ordered transitions in neuroblast gene expression have been shown to accompany the changing repertoire of functionally diverse cells generated by neuroblasts. To broaden our understanding of the biological significance of these ordered transitions in neuroblast gene expression and the events that(More)
This article considers the evidence for temporal transitions in CNS neural precursor cell gene expression during development. In Drosophila, five prospective competence states have so far been identified, characterized by the successive expression of Hb-->Kr-->Pdm-->Cas-->Gh in many, but not all, neuroblasts. In each temporal window of transcription factor(More)
The G protein–coupled receptors (GPCRs) 1 constitute a large and ancient superfamily of integral cell membrane proteins that play a central role in signal transduction and are activated by an equally diverse array of ligands. GPCRs share a seven hydrophobic ␣-helical domain structure and transduce signals through coupling to guanine nucleotide– binding(More)
The Drosophila ran gene has been isolated in a differential cDNA screen designed to identify genes that are dynamically expressed in embryonic neuroblasts. The guanine triphosphate (GTP)-binding Ran protein, a member of the Ras superfamily, has been shown to participate in a variety of transport related processes in other organisms. Drosophila ran codes for(More)
The Drosophila cerebrum originates from about 100 neuroblasts per hemisphere, with each neuroblast producing a characteristic set of neurons. Neurons from a neuroblast are often so diverse that many neuron types remain unexplored. We developed new genetic tools that target neuroblasts and their diverse descendants, increasing our ability to study fly brain(More)
To gain insight into the regulatory networks controlling Drosophila neural-identity decisions, we have identified new neuronal precursor genes by performing an in situ hybridization screen of differentially selected embryonic head cDNAs. Here, we describe the molecular characteristics and expression profile of nerfin-1, a novel pan-neural precursor gene.(More)
BACKGROUND Multi-genome comparative analysis has yielded important insights into the molecular details of gene regulation. We have developed EvoPrinter, a web-accessed genomics tool that provides a single uninterrupted view of conserved sequences as they appear in a species of interest. An EvoPrint reveals with near base-pair resolution those sequences that(More)
Many studies have focused on the mechanisms of axon guidance; however, little is known about the transcriptional control of the navigational components that carryout these decisions. This report describes the functional analysis of Nerfin-1, a nuclear regulator of axon guidance required for a subset of early pathfinding events in the developing Drosophila(More)
A systematic approach is described for analysis of evolutionarily conserved cis-regulatory DNA using cis-Decoder, a tool for discovery of conserved sequence elements that are shared between similarly regulated enhancers. Analysis of 2,086 conserved sequence blocks (CSBs), identified from 135 characterized enhancers, reveals most CSBs consist of shorter(More)