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Genetic complementation studies of multiple sulfatase deficiency.

A L Horwitz

    Proceedings of the National Academy of Sciences of the United States of America
    |December 1, 1979
    PubMed
    Summary
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    Multiple sulfatase deficiency (MSD) involves reduced activity of multiple sulfatase enzymes. Genetic complementation in heterokaryons suggests MSD

    Area of Science:

    • Biochemistry
    • Genetics
    • Cell Biology

    Background:

    • Multiple sulfatase deficiency (MSD) is a rare genetic disorder characterized by the combined deficiency of multiple sulfatase enzymes.
    • Sulfatases are crucial enzymes involved in the catabolism of sulfated compounds, and their deficiency leads to the accumulation of GAGs and other substrates.
    • Previous studies have indicated a potential common regulatory mechanism or a shared genetic defect underlying the multiple sulfatase deficiencies observed in MSD.

    Purpose of the Study:

    • To investigate the enzymatic activities of various sulfatases in cultured fibroblasts from individuals with multiple sulfatase deficiency (MSD).
    • To explore the potential for genetic complementation between MSD fibroblasts and cells from patients with specific sulfatase deficiencies (Sanfilippo A and Hunter syndromes).
    • To elucidate the genetic basis of MSD by examining enzyme activities and complementation patterns in heterokaryons.

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    Main Methods:

    • Cultured fibroblasts from two MSD patients were analyzed for the activities of arylsulfatases A, B, C, iduronate-sulfate sulfatase, sulfamidase, N-acetylglucosamine-6-sulfate sulfatase, and N-acetylgalactosamine-6-sulfate sulfatase.
    • Enzyme activity assays were performed on mixtures of MSD cell extracts with normal cell extracts and with extracts from Sanfilippo A and Hunter syndrome fibroblasts.
    • Heterokaryons were generated by fusing MSD fibroblasts with fibroblasts from Sanfilippo A and Hunter syndrome patients to assess complementation of enzyme deficiencies.

    Main Results:

    • Fibroblasts from MSD patients exhibited decreased activities of arylsulfatases A, B, and C, iduronate-sulfate sulfatase, sulfamidase, and N-acetylglucosamine-6-sulfate sulfatase.
    • N-acetylgalactosamine-6-sulfate sulfatase activity was reduced in one MSD cell line but not the other.
    • Fusion of MSD cells with Sanfilippo A fibroblasts resulted in partial correction of enzyme deficiencies, while fusion with Hunter syndrome fibroblasts led to a significant increase in iduronate-sulfate sulfatase activity.

    Conclusions:

    • The observed genetic complementation in heterokaryons indicates that the genetic defect in MSD is distinct from the specific genetic defects causing isolated sulfatase deficiencies in Sanfilippo A and Hunter syndromes.
    • These findings support the hypothesis of a common genetic defect in MSD that affects the activity of multiple sulfatases, rather than independent defects in each enzyme.
    • Further research is warranted to identify the specific gene and molecular mechanism underlying multiple sulfatase deficiency.