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Related Experiment Videos

Hyperlysinemia without clinical findings.

I Ozalp, A Hasanoğlu, E Tunçbilek

    Acta Paediatrica Scandinavica
    |November 1, 1981
    PubMed
    Summary

    Hereditary hyperlysinemia, a condition with high lysine levels, shows clinical heterogeneity. This case highlights a serious biochemical defect without symptoms, indicating varied patient outcomes.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Metabolic Disorders

    Background:

    • Hereditary hyperlysinemia is an autosomal recessive metabolic disorder.
    • It is characterized by elevated plasma lysine levels due to defects in lysine metabolism.
    • Enzyme deficiencies in the lysine degradation pathway are the primary cause.

    Observation:

    • A three-year-old asymptomatic boy presented with persistently high plasma lysine levels (685-1370 mumol/l).
    • Excessive urinary excretion of ornithine, arginine, and cystine was observed.
    • Skin fibroblast cultures showed no detectable activity of lysine-ketoglutarate reductase or saccharopine dehydrogenase.

    Findings:

    • The patient exhibited a significant biochemical defect in lysine metabolism.
    • Despite the severe enzyme deficiency, the patient remained asymptomatic.
    • This contrasts with previously reported cases of hereditary hyperlysinemia, which often present with neurological or developmental issues.

    Implications:

    • This case underscores the clinical heterogeneity of hereditary hyperlysinemia.
    • It suggests that biochemical severity does not always correlate with clinical manifestation.
    • Further research is needed to understand the factors influencing phenotypic variability in this disorder.

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