Signaling by Hedgehog

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Homo sapiens
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Hedgehog (Hh) is a secreted morphogen that regulates developmental processes in vertebrates including limb bud formation, neural tube patterning, cell growth and differentiation (reviewed in Hui and Angers, 2011). Hh signaling also contributes to stem cell homeostasis in adult tissues. Downregulation of Hh signaling can lead to neonatal abnormalities, while upregulation of signaling is associated with the development of various cancers (Beachy et al, 2004; Jiang and Hui, 2008; Hui and Angers, 2011).

Hh signaling is switched between 'off' and an 'on' states to differentially regulate an intracellular signaling cascade that targets the Gli transcription factors. In the absence of Hh ligand, cytosolic Gli proteins are cleaved to yield a truncated form that translocates into the nucleus and represses target gene transcription. Binding of Hh to the Patched (PTC) receptor on the cell surface stabilizes the Gli proteins in their full-length transcriptional activator form, stimulating Hh-dependent gene expression (reviewed in Hui and Angers, 2011; Briscoe and Therond, 2013).

Literature References
PubMed ID Title Journal Year
15549094 Tissue repair and stem cell renewal in carcinogenesis

Beachy, PA, Karhadkar, SS, Berman, DM

Nature 2004
21801010 Gli proteins in development and disease

Hui, CC, Angers, S

Annu. Rev. Cell Dev. Biol. 2011
23719536 The mechanisms of Hedgehog signalling and its roles in development and disease

Briscoe, J, Thérond, PP

Nat. Rev. Mol. Cell Biol. 2013
19081070 Hedgehog signaling in development and cancer

Jiang, J, Hui, CC

Dev. Cell 2008
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