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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Smoothened mutants reveal redundant roles for Shh and Ihh signaling including regulation of L/R symmetry by the mouse node.

Genetic analyses in Drosophila have demonstrated that the multipass membrane protein Smoothened ( Smo) is essential for all Hedgehog signaling. We show that Smo acts epistatic to Ptc1 to mediate Shh and Ihh signaling in the early mouse embryo. Smo and Shh/Ihh compound mutants have identical phenotypes: embryos fail to turn, arresting at somite stages with a small, linear heart tube, an open gut and cyclopia. The absence of visible left/right (L/R) asymmetry led us to examine the pathways controlling L/R situs. We present evidence consistent with a model in which Hedgehog signaling within the node is required for activation of Gdf1, and induction of left-side determinants. Further, we demonstrate an absolute requirement for Hedgehog signaling in sclerotomal development and a role in cardiac morphogenesis.[1]

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