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Related Experiment Videos

Serum carnosinase deficiency: a non-disabling phenotype?

M Cohen, P L Hartlage, N Krawiecki

    Journal of Mental Deficiency Research
    |December 1, 1985
    PubMed
    Summary

    Serum carnosinase deficiency, a rare condition, affects carnosine metabolism. This study found no direct link between reduced serum carnosinase activity and neurological symptoms, suggesting a possible predisposition for mental deficiency.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Neurology

    Background:

    • Serum carnosinase deficiency (McKusick 21220) is a rare genetic disorder.
    • Previous reports described 13 cases; this study identifies 10 additional individuals.

    Purpose of the Study:

    • To investigate serum carnosinase activity in affected individuals.
    • To explore the relationship between serum carnosinase deficiency and neurological symptoms.
    • To analyze carnosine and homocarnosine levels in affected individuals.

    Main Methods:

    • Assessed serum carnosinase activity and kinetic parameters (Km).
    • Measured urinary carnosine excretion after a meat-free diet.
    • Quantified cerebrospinal fluid (CSF) homocarnosine levels.
    • Correlated enzyme activity with observed clinical symptoms.

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    Main Results:

    • All individuals excreted increased urinary carnosine despite dietary changes.
    • Serum carnosinase activity ranged from 0-30% of normal.
    • Both normal and increased Km values for carnosine were observed.
    • CSF homocarnosine levels were elevated (3.4-15 mM).
    • No correlation found between neurological symptom severity/type and residual enzyme activity.
    • Clinical presentations varied, including attention deficit disorder, developmental delay, seizures, and neurosensory hearing loss.

    Conclusions:

    • The findings strengthen the suspicion that serum carnosinase deficiency may be unrelated to the observed neurological symptoms.
    • A potential association between serum carnosinase deficiency and a predisposition for mental deficiency warrants further investigation.
    • Further analysis of a larger cohort is needed for definitive conclusions.