Ventral specification and perturbed boundary formation in the mouse midbrain in the absence of Hedgehog signaling
Copyright policy )Ventral specification and perturbed boundary formation in the mouse midbrain in the absence of Hedgehog signaling
AbstractAlthough Hedgehog (HH) signaling plays a critical role in patterning the ventral midbrain, its role in early midbrain specification is not known. We examined the midbrains of sonic hedgehog (Shh) and smoothened (Smo) mutant mice where HH signaling is respectively attenuated and eliminated. We show that some ventral (Evx1+) cell fates are specified in the Shh−/− mouse in a Ptc1‐ and Gli1‐independent manner. HH‐independent ventral midbrain induction was further confirmed by the presence of a Pax7‐negative ventral midbrain territory in both Shh−/− and Smo−/− mice at and before embryonic day (E) 8.5. Midbrain signaling centers are severely disrupted in the Shh−/− mutant. Interestingly, dorsal markers are up‐regulated (Wnt1, Gdf7, Pax7), down‐regulated (Lfng), or otherwise altered (Zic1) in the Shh−/− midbrain. Together with the increased cell death seen specifically in Shh−/− dorsal midbrains (E8.5–E9), our results suggest specific regulation of dorsal patterning by SHH, rather than a simple deregulation due to its absence. Developmental Dynamics 237:1359‐1372, 2008. © 2008 Wiley‐Liss, Inc.
- The University of Texas at Austin United States
- Vanderbilt University Medical Center United States
- Neurosciences Institute United States
Mice, Knockout, Neurons, Patched Receptors, Kruppel-Like Transcription Factors, Receptors, Cell Surface, Smoothened Receptor, Zinc Finger Protein GLI1, Receptors, G-Protein-Coupled, Patched-1 Receptor, Mice, Mesencephalon, Pregnancy, Morphogenesis, Animals, Cell Lineage, Female, Hedgehog Proteins, Signal Transduction
Mice, Knockout, Neurons, Patched Receptors, Kruppel-Like Transcription Factors, Receptors, Cell Surface, Smoothened Receptor, Zinc Finger Protein GLI1, Receptors, G-Protein-Coupled, Patched-1 Receptor, Mice, Mesencephalon, Pregnancy, Morphogenesis, Animals, Cell Lineage, Female, Hedgehog Proteins, Signal Transduction
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