PNKD (PNKD Serine/Threonine Kinase): PNKD is a gene that encodes a serine/threonine kinase, a type of enzyme involved in phosphorylation reactions. Mutations in the PNKD gene have been linked to a neurological disorder known as paroxysmal nonkinesigenic dyskinesia (PNKD). PNKD is characterized by sudden and involuntary movements, and the PNKD gene's function appears to be crucial in maintaining proper neuronal activity and movement control....