| Component = | Process = | Orthologs = }} The Huntingtin gene, also called HD (Huntington disease) gene, or the IT15 ("interesting transcript 15") gene codes for a 348 kDa protein called huntingtin protein. The exact function of this protein isn't known, but it plays an important role in nerve cells. Within cells, huntingtin may be involved in signaling, transporting materials, binding proteins and other structures, and protecting against programmed cell death (apoptosis). The huntingtin prote… (More on Huntingtin)