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Modeling Charcot-Marie-Tooth Disease In Vitro by Transfecting Mouse Primary Motoneurons
Published on: January 7, 2019
Mouse Model of Fast-Channel Genetic Myasthenic Syndrome Carrying Chrne p.P141L Mutation
Richard G Webster1, Susan Maxwell1, Yin Y Dong1
1Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford OX3 9DS, UK.
Biomolecules
|July 28, 2026
Summary
Fast-channel genetic myasthenic syndromes (FCGMSs) result from muscle nicotinic acetylcholine receptor (AChR) variants. A new mouse model shows dysfunctional AChR incorporation is worse than absence, aiding FCGMS research.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Fast-channel genetic myasthenic syndromes (FCGMSs) stem from muscle nicotinic acetylcholine receptor (AChR) variants impairing neuromuscular transmission.
- The CHRNE p.P141L variant causes severe FCGMS, but its precise impact on neuromuscular function is unclear.
Purpose of the Study:
- To characterize a novel knock-in mouse model of the CHRNE p.P141L variant.
- To investigate the functional consequences of this variant on neuromuscular transmission and synaptic plasticity.
- To evaluate potential therapeutic strategies for FCGMS.
Main Methods:
- Generated a CHRNE p.P141L knock-in mouse model.
- Performed electrophysiological analyses of neuromuscular junctions (NMJs).
- Assessed survival rates and disease severity in mutant mice and crossbred lines.
- Tested pharmacological interventions (3,4-diaminopyridine and DC-98).
Main Results:
- Homozygous mutant mice exhibited early lethality, recapitulating severe FCGMS.
- Electrophysiology revealed impaired post-synaptic function (reduced potentials) with compensatory pre-synaptic adaptation (increased quantal content).
- Disease severity surpassed that of CHRNE null mice, suggesting detrimental effects of dysfunctional receptor incorporation.
Conclusions:
- Dysfunctional AChR incorporation is more deleterious than receptor absence in FCGMS.
- Subunit composition critically influences neuromuscular transmission.
- The εP141L mouse model is a valuable tool for studying FCGMS mechanisms and developing therapies.
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