Patient's question:
My husband's family has a history of phenylketonuria. My husband's older brother had phenylketonuria and passed away at a very young age. My husband's younger nephew also suffers from this disease. We are worried that if we have children in the future, the disease may be inherited across generations. We would like to consult about the mode of intergenerational inheritance of phenylketonuria, the probability of our child inheriting the disease across generations. What is the mode of intergenerational inheritance of phenylketonuria? How can it be prevented?Doctor's answer:
Phenylketonuria (PKU) is a common amino acid metabolic disorder caused by a deficiency of enzymes in the phenylalanine degradation pathway, 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. PKU is relatively common among hereditary amino acid metabolic disorders and follows an autosomal recessive pattern of inheritance. If a newborn baby undergoes a thorough examination and tests negative for phenylketonuria, it is highly unlikely that they will develop the condition later in life, and there is no need to worry.