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Related Experiment Videos

Methylmalonic acidemia.

I Matsuda, T Terashima, J Yamamoto

    European Journal of Pediatrics
    |July 3, 1978
    PubMed
    Summary

    A patient with a rare metabolic disorder, methylmalonic acidemia, showed improvement on a special diet. This condition results from a deficiency in methylmalonyl-CoA carbonyl-mutase, impacting amino acid metabolism.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Pediatric Medicine

    Background:

    • Metabolic acidosis is a serious condition often linked to genetic disorders.
    • Hyperglycinemia, hyperuricemia, hypoglycemia, and hypertammonemia can indicate underlying metabolic pathway defects.

    Observation:

    • A patient presented with severe metabolic acidosis, hyperglycinemia, hyperuricemia, hypoglycemia, and hypertammonemia.
    • The metabolic acidosis was attributed to methylmalonic acid accumulation and was unresponsive to vitamin B12 therapy.

    Findings:

    • In vitro studies revealed a methylmalonyl-CoA carbonyl-mutase deficiency in the patient's lymphoid cell line.
    • The patient demonstrated improved growth and development on a diet restricted in isoleucine, methionine, threonine, and valine.

    Implications:

    • This case highlights methylmalonic acidemia as a treatable inborn error of metabolism.
    • Dietary management is crucial for patients with methylmalonyl-CoA carbonyl-mutase deficiency.
    • Understanding enzyme deficiencies aids in diagnosing and managing complex metabolic disorders.

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