People with the degenerative disorder Huntington’s disease could receive pioneering treatment with stem cells to try to slow development of symptoms.
Cardiff University plans to begin the first transplants at a specialist brain centre by the end of the year.
A new procedure will be used to administer the transplant, which will be evaluated for effectiveness by the following spring.
Huntingdon’s is caused by a single faulty gene and is currently incurable.
William Gray, the Brain Repair and Intracranial Neurotherapeutics (Brain) Unit’s professor of functional neuroscience, said: “The procedure marks a next stage in our battle to combat the debilitating effects of this currently incurable disorder.