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• W1979414180 abstract "The zinc finger transcription factor GLI3 is considered a repressor of vertebrate Hedgehog (Hh) signaling. In humans, the absence of GLI3 function causes Greig cephalopolysyndactyly syndrome, affecting the development of the brain, eye, face, and limb. Because the etiology of these malformations is not well understood, we examined the phenotype of mouse Gli3-/- mutants as a model to investigate this. We observed an up-regulation of Fgf8 in the anterior neural ridge, isthmus, eye, facial primordia, and limb buds of mutant embryos, sites coinciding with the human disease. Intriguingly, endogenous apoptosis was reduced in Fgf8-positive areas in Gli3-/- mutants. Since SHH is thought to be involved in Fgf8 regulation, we compared Fgf8 expression in Shh-/- and Gli3-/-;Shh-/- mutant embryos. Whereas Fgf8 expression was almost absent in Shh-/- mutants, it was up-regulated in Gli3-/-;Shh-/- double mutants, suggesting that SHH is not required for Fgf8 induction, and that GLI3 normally represses Fgf8 independently of SHH. In the limb bud, we provide evidence that ectopic expression of Gremlin in Gli3-/- mutants might contribute to a decrease in apoptosis. Together, our data reveal that GLI3 limits Fgf8-expression domains in multiple tissues, through a mechanism that may include the induction or maintenance of apoptosis." @default.
• W1979414180 created "2016-06-24" @default.
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• W1979414180 date "2002-11-01" @default.
• W1979414180 modified "2023-10-12" @default.
• W1979414180 title "Mouse GLI3 Regulates Fgf8 Expression and Apoptosis in the Developing Neural Tube, Face, and Limb Bud" @default.
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• W1979414180 doi "https://doi.org/10.1006/dbio.2002.0811" @default.
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