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Molecular basis for hyperkalemic periodic paralysis.

R H Brown

    International Journal of Neurology
    |January 1, 1991
    PubMed
    Summary

    Mutations in skeletal muscle sodium channels cause periodic paralysis, leading to abnormal potassium levels and muscle weakness. Research links these channel defects to specific mutations, impacting sodium conductance and disease presentation.

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    Area of Science:

    • Molecular Biology
    • Neuroscience
    • Genetics

    Background:

    • Periodic paralysis encompasses hypokalemic and hyperkalemic forms, often linked to skeletal muscle sodium channel mutations.
    • Episodes are precipitated by rest after exertion, with carbohydrates potentially triggering weakness in hypokalemic paralysis.
    • These disorders are inherited in an autosomal dominant pattern, affecting muscle membrane potential and ion conductance.

    Purpose of the Study:

    • To investigate the role of skeletal muscle sodium channel mutations in the pathogenesis of periodic paralysis.
    • To elucidate the biophysical properties of abnormal sodium channels and their interaction with extracellular potassium.
    • To identify specific mutations and their correlation with disease phenotypes, including cold-sensitive paramyotonia congenita.

    Main Methods:

    • Analysis of human sodium channel gene polymorphisms and linkage analysis with disease markers (e.g., Na-2, growth hormone).
    • Electrophysiological studies on affected myotubes to assess sodium channel behavior under varying extracellular potassium concentrations.
    • Identification and molecular characterization of mutations within the sodium channel gene, including amino acid substitutions.

    Main Results:

    • A strong genetic linkage (lod score of 7) was established between hyperkalemic periodic paralysis and sodium channel gene polymorphisms.
    • Affected myotubes exhibit abnormal sodium channel gating, with prolonged openings or repetitive activity in response to elevated extracellular potassium.
    • Mutations, such as glycine to valine substitution, were identified in the III-IV intracytoplasmic loop, affecting channel inactivation.

    Conclusions:

    • Potassium directly influences abnormal sodium channel gating, leading to aberrant sodium current and contributing to periodic paralysis.
    • Specific mutations in TTX-sensitive sodium channels are directly implicated in the molecular basis of periodic paralysis.
    • Understanding these molecular defects provides insight into channel biophysics and disease mechanisms, potentially guiding therapeutic strategies.

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