Protein patched homolog 1 (PTCH1)

Acts as a receptor for sonic hedgehog (SHH), indian hedgehog (IHH) and desert hedgehog (DHH). Associates with the smoothened protein (SMO) to transduce the hedgehog's proteins signal.

Appears to have a tumor suppressor function, as inactivation of this protein is most likely a necessary, if not sufficient step for tumorigenesis. .