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Related Experiment Videos

Citrullinemia: phenotypic variations

D T Whelan, T Brusso, M Spate

    Pediatrics
    |June 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This study reports a case of citrullinemia in an infant, successfully managed with dietary protein restriction and amino acid therapy. The infant shows normal development, suggesting effective treatment for this urea cycle disorder.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Pediatrics

    Background:

    • Citrullinemia is a rare urea cycle disorder characterized by elevated plasma citrulline levels.
    • Early diagnosis and intervention are crucial for managing hyperammonemia and preventing neurological damage.

    Observation:

    • An 18-month-old female infant diagnosed with citrullinemia at 5 days of age presented with markedly elevated plasma and urine citrulline.
    • Hyperammonemia was observed at 1 month of age, with serum ammonia levels rising significantly.
    • Argininosuccinic acid synthetase activity in skin fibroblasts was measured to assess enzyme function.

    Findings:

    • Dietary protein restriction (1.6 gm/kg/day) and temporary L-amino acid supplementation normalized serum ammonia levels.
    • The infant exhibited normal physical and mental development by 18 months of age.

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  • Family screening suggested potential genetic heterogeneity contributing to phenotypic variation in citrullinemia.

    • Implications:

    • This case highlights the effectiveness of early dietary management in achieving favorable outcomes for citrullinemia.
    • Understanding genetic heterogeneity is important for predicting disease course and tailoring treatment strategies.
    • Further research into the genetic basis of citrullinemia can improve diagnostic and therapeutic approaches.