E-Mail In a study conducted at the University of Helsinki, researchers found a cause for severe epilepsy resulting in death in Parson Russell Terrier puppies at a few months of age. A change in the PITRM1 gene can lead to a dysfunction of mitochondria, the cellular energy pumps. Concurrently, amyloid-β accumulation and widespread neurodegeneration associated with Alzheimer's disease were identified in the puppies' brains. Changes to the PITRM1 gene in humans also cause a severe but slowly progressing brain disease. Some Parson Russell Terrier puppies were seen to suddenly develop epileptic seizures at 6 to 12 weeks of age. The disease progressed very rapidly, in a matter of hours in the worst cases, to a situation where the seizures were continuous and unresponsive to medication.