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- W2149274570 abstract "Insect metamorphosis provides a valuable model for studying mechanisms of steroid hormone action on the nervous system during a dynamic phase of functional remodeling. TheDrosophila Broad Complex(BRC) holds a pivotal position in the gene expression cascade triggered by the molting hormone 20-hydroxyecdysone (20E) at the onset of metamorphosis. We previously demonstrated that theBRC,which encodes a family of zinc-finger transcription factors, is essential for transducing 20E signals into the morphogenetic movements and cellular assembly that alter the CNS from juvenile to adult form and function. We set out to examine the relationship ofBRCto two other genes,IMP-E1andDeformed(Dfd), involved in the metamorphic transition of the CNS. Representatives of the whole family ofBRCtranscript isoforms accumulate in the CNS during the larval-to-pupal transition and respond directly to 20Ein vitro. IMP-E1is also directly regulated by 20E, but its induction is independent ofBRC,revealing that 20E works through at least two pathways in the CNS. DFD expression is also independent ofBRCfunction. Surprisingly, BRC and DFD proteins are expressed in distinct, nonoverlapping subsets of neuronal nuclei of the subesophageal ganglion even though both are required for its migration into the head capsule. This suggests that the segment identity and ecdysone cascades operate in parallel to control region-specific reorganization during metamorphosis." @default.
- W2149274570 created "2016-06-24" @default.
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- W2149274570 date "1998-06-01" @default.
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- W2149274570 title "Parallel Molecular Genetic Pathways Operate during CNS Metamorphosis inDrosophila" @default.
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- W2149274570 doi "https://doi.org/10.1006/mcne.1998.0683" @default.
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