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Sodium channel gene defects in the periodic paralyses
1Mahoney Institute of Neurological Sciences, University of Pennsylvania School of Medicine, Philadelphia 19104.
Current Opinion in Neurobiology
|October 1, 1992
Summary
Abnormal sodium (Na+) currents cause muscle weakness in periodic paralysis. Genetic mutations in the adult skeletal muscle sodium channel gene are responsible for these abnormal currents and the disease.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Periodic paralysis episodes are linked to abnormal sodium (Na+) currents causing membrane depolarization.
- Muscle weakness is a primary symptom of periodic paralysis.
Purpose of the Study:
- To investigate the genetic basis of periodic paralysis.
- To establish the link between Na+ channel gene mutations and the disease phenotype.
Main Methods:
- Analysis of point mutations in the gene encoding the adult skeletal muscle voltage-dependent Na+ channel.
- Electrophysiological studies to assess Na+ channel function.
Main Results:
- Identification of various point mutations in the Na+ channel gene.
- Demonstration that these mutations lead to abnormal Na+ currents.
- Correlation of abnormal currents with disease expression.
Conclusions:
- Point mutations in the adult skeletal muscle voltage-dependent Na+ channel gene are a primary cause of periodic paralysis.
- These genetic defects result in abnormal Na+ currents, leading to the characteristic muscle weakness.