Jervine

Jervine is a steroidal alkaloid with molecular formula C27H39NO3 which is derived from the plant genus "Veratrum". Similar to cyclopamine, which also occurs in the genus "Veratrum", it is a teratogen implicated in birth defects when consumed by animals during a certain period of their gestation.
Physiological effects.
Jervine is a potent teratogen causing birth defects in vertebrates. In severe cases it can cause cyclopia and holoprosencephaly.
Mechanism of action.
Jervine's biological activity is mediated via its interaction with the 7 pass trans membrane protein smoothened. Jervine binds with and inhibits smoothened, which is an integral part of the hedgehog signaling pathways. With smoothened inhibited, the GLI1 transcription cannot be activated and hedgehog target genes cannot be transcribed.