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["Transitory" phenylketonuria. A permanent deficit].

F Rey, R J Leeming, H C Curtius

    Archives Francaises De Pediatrie
    |November 1, 1979
    PubMed
    Summary
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    This study introduces "transitory" phenylketonuria, a condition where infants initially show high phenylalanine levels but later tolerate normal protein intake. This highlights a potentially distinct metabolic disorder in newborns.

    Area of Science:

    • Biochemistry
    • Genetics
    • Neonatal Medicine

    Background:

    • Hyperphenylalaninemia in neonates requires careful management to prevent neurological damage.
    • Understanding the diverse causes and prognoses of elevated phenylalanine is crucial for early intervention.

    Observation:

    • Three neonates presented with hyperphenylalaninemia (>1.8 µmol/ml) but normalized with a standard diet (3g/kg protein).
    • Atypical (zero-order) phenylalanine clearance kinetics were observed at one year, with persistence noted at five years in two cases.
    • Parental screening revealed normal phenylalanine levels and phenylalanine/tyrosine ratios.

    Findings:

    • The study proposes a new entity: "transitory" phenylketonuria, characterized by transient hyperphenylalaninemia.
    • This condition may not be homogenous, as one case showed a partial defect in biopterin synthesis.

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  • The underlying mechanism remains unclear in two of the reported cases.

    • Implications:

    • Recognition of "transitory" phenylketonuria could refine diagnostic and treatment approaches for neonatal hyperphenylalaninemia.
    • Further research is needed to elucidate the specific genetic and biochemical pathways involved.
    • Distinguishing this entity from classic phenylketonuria is vital for appropriate patient management and prognosis.