Desert Hedgehog (DHH) is one of three signaling molecules belonging to the hedgehog family, a group of intracellular signaling molecules characterized for their regulatory ability in developmental tissue patterning. DHH is an essential component to the integrity of peripheral nerve function and structure. There is also strong support that it is critical to normal, testicular development, and the survival of spermatocytes. DHH cleaves into two chains; the DHH N-product which is localized at the cell surface, and the DHH C-product which diffuses from the cell. Defects in expression are though to cause complete pure gonadal dysgenesis 46,XY type (GDXYM), and partial gonadal dysgenesis with minifascicular neuropathy 46, XY (PGD).