PKU.com Community Discussion Forum Parent support Blond Hair…..Blue Eyes Reply To: Blond Hair…..Blue Eyes

#9102
Avatar of Craig
Lemmy
Member
Phenylalanine is convertedto tyrosine bytheenzyme phenylalanine hydroxylase (PAH, the one absent in Classic PKU) in the liver, tryrosine is a precurser for the production of melanine which darkens hair, skin and eyes. The low levels of tyrosine, apparent because of this disfunction, are responsible for the fairer features of PKU patients. If you are off-diet, tyrosine levels will increase as it is a naturally occuring amino acid in protein foods just as phenylalanine is, so to assume being off diet will make you fairer is questionable.
Quick Poll
Which of the following best describes you?
Parent/caregiver of an infant with PKU
Parent/caregiver of a child with PKU
Teenager with PKU
Adult with PKU
Grandparent of a child with PKU
Know someone with PKU
Healthcare professional