Phenylketonuria is considered one of the most asked concept.
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Phenylketonuria
It is an inborn error of metabolism, which is inherited as an autosomal recessive trait.
It is a rare disease in which the individual is born without the ability to properly breakdown an amino acid called phenylalanine.
Individuals with this disease have a missing enzyme called phenylalanine hydroxylase, which is needed to break down an essential amino acid phenylalanine into tyrosine in the liver.
This phenylalanine is accumulated and gets converted into phenyl pyruvic acid and other derivatives leading to mental retardation.