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Published on: September 12, 2020
Paroxysmal dyskinesias in the lethargic mouse mutant
1Department of Neurology, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA.
Summary
Lethargic mutant mice with CCHB4 gene mutations exhibit a novel paroxysmal dyskinesia. These findings highlight calcium channelopathies as a cause of movement disorders, offering a new model for research.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Lethargic mutant mice possess a mutation in the CCHB4 gene, encoding the beta4 subunit of voltage-gated calcium channels.
- Previous studies identified neurobehavioral phenotypes including absence epilepsy, ataxia, and hypoactivity in these mutants.
Purpose of the Study:
- To investigate a potential fourth element of the neurobehavioral phenotype in lethargic mutant mice.
- To characterize transient attacks of severe dyskinetic motor behavior observed in these mutants.
Main Methods:
- Behavioral analysis of mutant mice under various environmental and chemical stimuli.
- Electroencephalogram (EEG) recordings to correlate motor behavior with neural activity.
Main Results:
- Lethargic mutants display transient attacks of severe dyskinetic motor behavior, triggered by stimuli promoting locomotor activity.
- EEG and behavioral analyses suggest these attacks are paroxysmal dyskinesia, not motor epilepsy.
- The findings indicate a novel phenotype element in CCHB4 calcium channel mutants.
Conclusions:
- Lethargic mutants provide a novel animal model for studying paroxysmal dyskinesias.
- Calcium channelopathies are implicated in the etiology of paroxysmal dyskinesias.
