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Related Experiment Videos

Phenylketonuria in Indian children.

G E Joshua, S Chandy, A N Radhakrishnan

    Journal of Inherited Metabolic Disease
    |January 1, 1978
    PubMed
    Summary

    Phenylketonuria (PKU) causes rapid neurological decline in untreated Indian children. Brain imaging reveals myelin sheath damage and reduced lipids, indicating severe neurodegeneration in PKU patients.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Genetics

    Background:

    • Phenylketonuria (PKU) is an inherited metabolic disorder.
    • Untreated PKU leads to a buildup of phenylalanine in the body.
    • This buildup is toxic to the developing brain.

    Observation:

    • Three untreated Indian children with PKU experienced rapid neurological deterioration.
    • Elevated plasma, cerebrospinal fluid, and urine phenylalanine levels were observed.
    • A high phenylalanine-tyrosine ratio was a consistent finding.

    Findings:

    • Brain biopsy revealed decreased myelin lipids, specifically cerebroside and sulphatide.
    • White matter showed reduced total cerebroside content.
    • Microscopy indicated pallor and spongy degeneration of white matter.
    • Ultrastructural analysis identified spongy vesicles within the myelin sheath lamellae.

    Implications:

    • These findings highlight the severe neurotoxic effects of phenylalanine in PKU.
    • The observed myelin damage underscores the critical need for early PKU diagnosis and treatment.
    • This research contributes to understanding the neuropathological mechanisms in phenylketonuria.

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