Variants in the DHDDS gene cause a severe neurodegenerative condition, characterized by tremors, seizures, coordination and learning difficulties, usually manifesting in early childhood. This Parkinson's-like condition is extremely rare, and until recently, parents were told there was nothing that could be done to slow its progression. But now, researchers from the Netherlands and the U.S. who created "mini brain" models from patients' own cells to test new therapies have found not only the mech