Babies with Tyr I are unable to process an amino acid called tyrosine found in protein containing foods. If untreated, tyrosine and other harmful substances build up in the baby's blood and cause serious liver and kidney damage. This may result in vomiting, diarrhea, bruising, swelling of the legs or stomach and problems with the bones and nerves. Babies appear normal at birth. Screening allows babies with Tyr 1 to be found early and treated with a special diet, medical formula and medicines. When treatment is started early, severe liver and kidney problems can be prevented. Children who are treated usually have normal growth and intelligence. One baby in 100,000 in BC is born with Tyr I.
For more information: