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.
slide 2 of 5. Phenylketonuria (PKU) Genetics: Mutation of the PAH Gene Phenylketonuria is caused by a mutation of the phenylalanine hydroxylase (PAH) gene which is found in the q arm of chromosome 12. The PAH gene gives specific instructions for the production of the enzyme phenylalanine hydroxylase that converts phenylalanine to tyrosine.