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Related Experiment Videos

Hair root analysis in X-linked ichthyosis.

J Dancis, V Jansen, J Hutzler

    Journal of Inherited Metabolic Disease
    |January 1, 1983
    PubMed
    Summary

    This study analyzed steroid sulfatase enzyme activity in hair roots of individuals with X-linked ichthyosis. Results suggest both maternal and paternal genes for steroid sulfatase remain active in hair root cells.

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    Area of Science:

    • Genetics
    • Biochemistry
    • Dermatology

    Background:

    • X-linked ichthyosis is a genetic disorder linked to steroid sulfatase deficiency.
    • Understanding gene expression in affected individuals is crucial for genetic research.
    • The Lyon hypothesis describes X-chromosome inactivation in females.

    Purpose of the Study:

    • To investigate steroid sulfatase enzyme activity in hair roots from a kindred with X-linked ichthyosis.
    • To determine if both maternal and paternal steroid sulfatase genes are active in hair root cells.
    • To compare enzyme activity distribution with conditions exhibiting genetic mosaicism.

    Main Methods:

    • Assaying enzyme activity (steroid sulfatase to neutral alpha-glucosidase ratio) in individual hair roots.
    • Analyzing the distribution patterns of enzyme ratios in heterozygotes.
    • Comparing findings with Lesch-Nyhan disease hair root data.

    Main Results:

    • The distribution of enzyme ratios in heterozygotes followed a normal curve, indicating a single cell population.
    • This pattern contrasts with the irregular distribution seen in Lesch-Nyhan disease, which shows mosaicism.
    • Steroid sulfatase activity was minimally higher in female controls than males, but not significantly.

    Conclusions:

    • Maternal and paternal steroid sulfatase genes appear to be active in vivo within each hair root cell.
    • This observation challenges the traditional Lyon hypothesis regarding X-chromosome inactivation in hair roots.
    • Findings align with previous in vitro studies on skin fibroblasts.

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