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Developmental
Metazoans

Hedgehog Signaling Pathway

Morphogen gradient pathway controlling tissue patterning and stem cell maintenance.

Overview

Hedgehog binding relieves Patched (PTCH1) inhibition of Smoothened (SMO), allowing GLI transcription factor activation. Crucial for embryonic patterning and adult stem cell maintenance.

Cellular Location

Primary cilium → nucleus

Clinical Significance

Mutations cause holoprosencephaly and Gorlin syndrome; SMO inhibitors (vismodegib) approved for BCC.

Key Molecules

Key Enzymes

Related Pathways