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- W2050872910 abstract "The transcriptional regulator Gli3 and the secreted signal Shh influence induction, patterning, and differentiation at several sites of mesenchymal/epithelial (M/E) interaction including the limbs, heart, face, and forebrain. We asked whether loss of function of these two genes has specific consequences for early differentiation of the primary olfactory pathway-which comprises both craniofacial and forebrain structures and depends on M/E induction during initial stages of development. Loss of Gli3 or Shh function does not compromise several aspects of olfactory receptor neuron (ORN) and olfactory ensheathing cell maturation; however, directed outgrowth of ORN axons and their initial targeting to the telencephalon is altered. In Gli3 mutant extra toes-Jackson (Xt(J)Xt(J)) embryos, ORN axons defasciculate and project aberrantly near the forebrain. They rarely enter the central nervous system, and their association with mesenchymal laminin is disrupted. In Shh-/-embryos, ORN axons exit a single olfactory epithelium (OE) that develops centrally within an altered mesenchymal environment in a dysmorphic proboscis. These axons project as a single nerve toward the mutant forebrain; however, their trajectory varies according to the position of the proboscis relative to the forebrain. These alterations in axon outgrowth probably reflect compromised inductive interactions in the olfactory primordia because neither Gli3 nor Shh are expressed in olfactory neurons. Thus, two genes that influence induction and subsequent differentiation of craniofacial structures and the forebrain have distinct consequences for ORN axon growth during the initial genesis of the olfactory pathway." @default.
- W2050872910 created "2016-06-24" @default.
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- W2050872910 creator A5075998138 @default.
- W2050872910 date "2004-01-01" @default.
- W2050872910 modified "2023-10-13" @default.
- W2050872910 title "Loss ofGli3 andShh function disrupts olfactory axon trajectories" @default.
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- W2050872910 doi "https://doi.org/10.1002/cne.20053" @default.
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