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Riboflavin-responsive defects of beta-oxidation.

N Gregersen

    Journal of Inherited Metabolic Disease
    |January 1, 1985
    PubMed
    Summary

    Multiple acyl-CoA dehydrogenation deficiencies can stem from defects in electron transfer flavoprotein (ETF) or electron transfer flavoprotein dehydrogenase (ETFDH). Some patients respond to riboflavin, suggesting FAD metabolism issues.

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    Area of Science:

    • Biochemistry
    • Metabolic Disorders
    • Genetics

    Background:

    • Acyl-CoA dehydrogenation is crucial for fatty acid, amino acid, and lysine metabolism.
    • Electron transfer flavoprotein (ETF) and ETFDH are common electron transporters in these pathways.
    • Flavin adenine dinucleotide (FAD) is an essential coenzyme for these dehydrogenation enzymes.

    Purpose of the Study:

    • Investigate the underlying causes of multiple acyl-CoA dehydrogenation deficiencies.
    • Identify the specific metabolic defects in patients unresponsive to ETF/ETFDH repair.
    • Explore the role of riboflavin and FAD metabolism in these disorders.

    Main Methods:

    • Analysis of acyl-CoA dehydrogenases, ETF, and ETFDH in affected patients.
    • Biochemical and clinical assessments of patient responses to riboflavin therapy.
    • In vivo and in vitro studies to rule out riboflavin uptake or FAD synthesis defects.

    Main Results:

    • Defects in ETF and/or ETFDH identified in some patients.
    • A subset of patients with multiple acyl-CoA dehydrogenation deficiencies showed clinical improvement with riboflavin.
    • Riboflavin uptake and FAD synthesis defects were excluded in these riboflavin-responsive patients.

    Conclusions:

    • Multiple acyl-CoA dehydrogenation deficiencies can arise from defects beyond the known dehydrogenases and ETF/ETFDH.
    • Riboflavin responsiveness suggests a potential defect in FAD metabolism, possibly related to mitochondrial FAD transport or binding.
    • Further investigation into FAD handling within mitochondria is warranted for these rare metabolic disorders.

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