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Electroconvulsive thresholds of inbred mouse strains
W N Frankel1, L Taylor, B Beyer
1The Jackson Laboratory, Bar Harbor, Maine 04609, USA. wnf@jax.org
Genomics
|June 21, 2001
Summary
The electroconvulsive threshold (ECT) test reveals genetic variations in neuroexcitability across mouse strains. This assay is reliable for screening anti-epileptic drugs and identifying genetic differences in seizure susceptibility.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- The electroconvulsive threshold (ECT) test is a standard method for evaluating anti-epileptic drug efficacy in rodent models.
- The genetic underpinnings and mechanistic basis of ECT responses remain largely unexplored.
- Understanding genetic contributions to seizure susceptibility is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the genetic basis of neuroexcitability using the ECT test across different inbred mouse strains.
- To assess the reliability and portability of the ECT assay across multiple laboratories.
- To determine if the ECT paradigm can detect single-locus genetic differences relevant to seizure disorders.
Main Methods:
- Determined seizure thresholds (clonic, tonic, psychomotor) in 16 inbred mouse strains across two independent laboratories.
- Analyzed the range of thresholds and cross-strain correlations for different seizure types.
- Evaluated the consistency of strain seizure susceptibility between laboratories.
Main Results:
- Observed significant variations in seizure thresholds among mouse strains, indicating diverse neuroexcitability alleles.
- Found generally good correlations between seizure types, with notable exceptions in outlier strains, suggesting specific genetic influences on seizure propagation.
- Demonstrated high comparability of relative seizure susceptibility between laboratories, confirming the ECT assay's portability.
- Confirmed the ECT paradigm's sensitivity in detecting single-locus differences.
Conclusions:
- Inbred mouse strains exhibit substantial genetic variability in neuroexcitability, influencing seizure susceptibility and propagation.
- The ECT test is a robust and portable assay suitable for cross-laboratory comparisons and serves as a reliable calibration standard.
- The ECT assay's sensitivity to single-locus differences provides a foundation for future genetic screens to identify novel neuroexcitability genes and models.