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Complementation analysis of human sialidase deficiency using natural substrates

D M Swallow, A T Hoogeveen, F W Verheijen

    Annals of Human Genetics
    |May 1, 1981
    PubMed
    Summary

    Somatic cell hybridization revealed three groups of sialidase deficiency disorders. Complementation restored normal enzyme function, suggesting abnormal glycoproteins are intermediates in enzyme processing.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Molecular Biology

    Background:

    • Sialidase deficiency disorders are a group of rare genetic conditions.
    • Understanding the genetic basis of these disorders is crucial for diagnosis and treatment.
    • Previous studies suggested heterogeneity within these disorders.

    Purpose of the Study:

    • To investigate the genetic complementation groups within sialidase deficiency disorders.
    • To elucidate the biochemical basis of complementation using glycoprotein enzyme analysis.
    • To understand the role of abnormal glycoprotein forms in the disease mechanism.

    Main Methods:

    • Somatic cell hybridization was used to create heterokaryons for complementation analysis.
    • Electrophoretic analysis was performed on glycoprotein enzymes, including adenosine deaminase and acid phosphatase.

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  • Aberrant and normal electrophoretic mobilities of enzymes were compared before and after complementation.

    • Main Results:

    • Complementation analysis identified at least three distinct complementation groups within sialidase deficiency disorders.
    • Electrophoretic analysis confirmed aberrant electrophoretic mobilities in glycoprotein enzymes due to excess sialic acid.
    • Complementation resulted in the disappearance of abnormal enzyme forms and the appearance of normal mobility components.

    Conclusions:

    • The findings support the existence of at least three genetic complementation groups for sialidase deficiency.
    • The complemented sialidase likely uses abnormal glycoprotein forms as substrates.
    • These abnormal glycoprotein forms may represent normal intermediates in glycoprotein enzyme processing.