Stevenson was sentenced to four years in prison for managing prostitutes and assault, but was released after 20 months. S tevenson was enraged by the La Presse story, though I have yet to find a press account in which he actually denied the details.
Genetic mutation. PKU is caused by a genetic mutation (change to the DNA) in the human phenylalanine hydroxylase (PAH) gene. There are many different types of mutations that can affect the PAH gene, all of which result in the body not producing a functioning PAH enzyme.
Phenylketonuria (PKU) is characterized by a person's inability to metabolize the amino acid phenylalanine.If the body can not process part of the protien phenylalanine (phe) then it can cause severe brain damage, skin disorders, behavioral problems, heart defects or even mental retardation.enetic Testing. The phenylalanine tolerance test is one form of genetic testing for PKU. It is performed by giving a person a measured amount of phenylalanine and the concentration of phenylalanine in the blood plasma is measured.