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Glycogen storage disease type Ib.

J Schaub, K Heyne

    European Journal of Pediatrics
    |September 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Glycogen storage disease type Ib (GSD Ib) presents similar symptoms to GSD Ia. GSD Ib is characterized by absent glucose-6-phosphate translocase, impacting glucose metabolism and causing neutropenia.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Pediatrics

    Background:

    • Glycogen storage disease type Ib (GSD Ib) shares clinical features with GSD Ia, including hepatomegaly, growth retardation, and metabolic derangements.
    • Key symptoms include bleeding tendency, hypoglycemia, hyperlactacidemia, hyperuricemia, hyperlipidemia, impaired platelet function, and neutropenia.

    Purpose of the Study:

    • To elucidate the biochemical basis of Glycogen storage disease type Ib.
    • To investigate the specific enzyme defect responsible for the clinical manifestations of GSD Ib.

    Main Methods:

    • Analysis of glucose-6-phosphatase activity in disrupted liver microsomes.
    • Assessment of glucose-6-phosphate translocase presence and function.
    • Evaluation of the glucose-6-phosphate-dependent hexosemonophosphate-shunt in granulocytes.

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    Main Results:

    • Overall glucose-6-phosphatase activity in disrupted liver microsomes is normal in GSD Ib.
    • Glucose-6-phosphate translocase, crucial for glucose-6-phosphate transport, is absent in GSD Ib.
    • In vivo, glucose-6-phosphatase activity is undetectable.
    • Impairment of the glucose-6-phosphate-dependent hexosemonophosphate-shunt observed in granulocytes.

    Conclusions:

    • GSD Ib is caused by the absence of glucose-6-phosphate translocase, not a defect in glucose-6-phosphatase itself.
    • The absence of this translocase disrupts glucose metabolism and contributes to the observed clinical phenotype, particularly neutropenia.
    • Further research into the hexosemonophosphate-shunt pathway in granulocytes may reveal additional insights into GSD Ib pathophysiology.