Phenylketonuria (PKU) Case Study
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Questions and Answers

Which enzyme is likely to be defective in a patient with PKU?

  • Phenylalanine hydroxylase (correct)
  • Serine hydroxylase
  • Glutamine hydroxylase
  • Tyrosine hydroxylase
  • What is the probable reason for the increase in serum phenylalanine in PKU?

  • Excessive production of tyrosine
  • Deficiency in serine hydroxylase
  • Deficiency in phenylalanine hydroxylase (correct)
  • Deficiency in tyrosine hydroxylase
  • What substance is likely to be found in the urine of a patient with PKU?

  • Glucose
  • Phenylketones (correct)
  • Tyrosine crystals
  • Urea
  • What is the normal reference range for serum phenylalanine concentration?

    <p>0.05 to 0.1 mmol/L</p> Signup and view all the answers

    Which of the following enzymes is involved in the conversion of phenylalanine to tyrosine?

    <p>Phenylalanine hydroxylase</p> Signup and view all the answers

    What is the likely consequence of a deficiency in phenylalanine hydroxylase?

    <p>Elevated serum phenylalanine levels</p> Signup and view all the answers

    What is the main consequence of elevated phenylalanine levels in individuals with PKU?

    <p>Intellectual disabilities and seizures</p> Signup and view all the answers

    Why is early detection of PKU crucial?

    <p>To reduce the risk of cognitive impairment and neurological complications</p> Signup and view all the answers

    What is the primary treatment for patients with PKU?

    <p>Phenylalanine-restricted diet</p> Signup and view all the answers

    Why might individuals with PKU need a dietary source of tyrosine?

    <p>To support various physiological functions and synthesizing important molecules in the body</p> Signup and view all the answers

    What will be found in the urine of individuals with PKU due to the shunting of phenylalanine into alternative metabolic pathways?

    <p>Elevated phenylpyruvate levels</p> Signup and view all the answers

    What is the consequence of not treating PKU promptly?

    <ul> <li>Intellectual disabilities, seizures, and developmental delays*</li> </ul> Signup and view all the answers

    Why is regular monitoring of blood phenylalanine levels essential for individuals with PKU?

    <ul> <li>To adjust the diet and treatment plan accordingly*</li> </ul> Signup and view all the answers

    Study Notes

    Phenylketonuria (PKU)

    • The defective enzyme in PKU patients is phenylalanine hydroxylase.
    • Elevated serum phenylalanine in PKU is likely due to the impairment of phenylalanine hydroxylase, leading to excessive accumulation of phenylalanine.

    Urinary Findings in PKU

    • Patients with PKU often exhibit high levels of phenylpyruvate, phenyllactate, and phenylacetate in their urine.

    Biochemistry of PKU

    • The normal reference range for serum phenylalanine concentration is 30-70 μmol/L.
    • Phenylalanine hydroxylase is the enzyme responsible for converting phenylalanine to tyrosine.

    Consequences of PKU

    • A deficiency in phenylalanine hydroxylase leads to the accumulation of phenylalanine in the blood, causing intellectual disability and other neurological disorders if left untreated.
    • Elevated phenylalanine levels in individuals with PKU can cause intellectual disability, seizures, and behavioral problems.
    • Early detection of PKU is crucial to prevent severe neurological damage and intellectual disability.

    Treatment and Management of PKU

    • The primary treatment for PKU involves a lifelong restriction of phenylalanine intake through a special diet.
    • Individuals with PKU may require a dietary source of tyrosine, an essential amino acid, since they are unable to convert phenylalanine to tyrosine.
    • Regular monitoring of blood phenylalanine levels is essential to ensure that levels remain within a safe range and to prevent intellectual disability.

    Complications of Untreated PKU

    • If left untreated, PKU can lead to severe intellectual disability, seizures, and behavioral problems.
    • Elevated phenylalanine levels can also cause skin problems, such as eczema and skin rashes.

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    Description

    Test your knowledge of phenylketonuria (PKU) with this case study about a two-week-old baby girl who tested positive for phenylketones. Explore the symptoms, diagnosis, and treatment of PKU in this quiz.

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