Patient's question:
My first child was diagnosed with phenylketonuria, and under the guidance of the hospital, we have already started treatment. Due to the relaxation of the two-child policy, we want a second child, but we are worried that the second child might also get this disease. Therefore, we would like to consult about the hereditary pattern of phenylketonuria in generational terms.What kind of help is needed: What is the generational inheritance pattern of phenylketonuria?
Doctor's answer:
Phenylketonuria (PKU) is a common amino acid metabolic disorder caused by a deficiency in the enzyme pathway of phenylalanine metabolism, which prevents phenylalanine from being converted into tyrosine. This leads to the accumulation of phenylalanine and its ketone bodies, which are excreted in large amounts in the urine. Infants are typically born healthy and symptoms usually begin to appear between 3 to 6 months of age. By the age of 1, symptoms become more pronounced. Clinical diagnosis primarily manifests as intellectual disability, recurrent seizures, and hyperpigmentation. Based on intellectual and developmental delays, behavioral abnormalities such as hyperactivity, spasticity, or epilepsy may also occur.