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- W2085336503 abstract "In sea urchin embryos Delta signaling specifies non-skeletogenic mesoderm (NSM). Despite the identification of some direct targets, several aspects of Delta Notch (D/N) signaling remain supported only by circumstantial evidence. To obtain a detailed and more complete image of Delta function we followed a systems biology approach and evaluated the effects of D/N perturbation on expression levels of 205 genes up to gastrulation. This gene set includes virtually all transcription factors that are expressed in a localized fashion by mid-gastrulation, and which thus provide spatial regulatory information to the embryo. Also included are signaling factors and some pigment cell differentiation genes. We show that the number of pregastrular D/N signaling targets among these regulatory genes is small and is almost exclusively restricted to non-skeletogenic mesoderm genes. However, Delta signaling also activates foxY in the small micromeres. As is the early NSM, the small micromeres are in direct contact with Delta expressing skeletogenic mesoderm. In contrast, no endoderm regulatory genes are activated by Delta signaling even during the second phase of delta expression, when this gene is transcribed in NSM cells adjacent to the endoderm. During this phase Delta provides an ongoing input which continues to activate foxY expression in small micromere progeny. Disruption of the second phase of Delta expression specifically abolishes specification of late mesodermal derivatives such as the coelomic pouches to which the small micromeres contribute." @default.
- W2085336503 created "2016-06-24" @default.
- W2085336503 creator A5001260404 @default.
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- W2085336503 date "2012-04-01" @default.
- W2085336503 modified "2023-10-01" @default.
- W2085336503 title "A comprehensive analysis of Delta signaling in pre-gastrular sea urchin embryos" @default.
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- W2085336503 doi "https://doi.org/10.1016/j.ydbio.2012.01.017" @default.
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