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Sleep Duration and Epilepsy Risk: Mendelian Randomization and Functional Validation of CACNA1A rs2228130-Related
Xun Li1,2,3, Yuying Hou4, Yanping Ren4
1Clinical College of Neurology, Neurosurgery and Neurorehabilitation, Tianjin Medical University, No. 22, Qixiangtai Road, Heping District, Tianjin, 300070, China.
Longer sleep duration is genetically linked to a reduced risk of epilepsy. A specific genetic variant, CACNA1A rs2228130, impairs inhibitory synaptic transmission, disrupting sleep and increasing seizure susceptibility, highlighting sleep optimization as a potential epilepsy prevention strategy.
Area of Science:
- Neuroscience
- Genetics
- Sleep Medicine
Background:
- Epilepsy is a complex neurological disorder with a significant genetic component.
- The relationship between sleep disturbances and epilepsy risk is not fully understood.
- Investigating genetic links between sleep traits and epilepsy can reveal underlying mechanisms and potential therapeutic targets.
Purpose of the Study:
- To evaluate the causal association between genetically determined sleep traits and epilepsy risk using Mendelian randomization.
- To investigate the functional mechanism of a prioritized epilepsy-risk genetic variant (CACNA1A rs2228130).
- To explore the role of inhibitory synaptic transmission and sleep phenotypes in epilepsy pathogenesis.
Main Methods:
- Utilized large-scale European genome-wide association study (GWAS) datasets.
- Applied multiple Mendelian randomization methods (inverse variance weighted, MR-Egger, weighted median).
- Performed gene-level enrichment analysis and functional validation in human iPSC and mouse models.
Main Results:
- Longer sleep duration showed a significant protective genetic association with lower epilepsy risk (OR=0.9937, p<1x10⁻⁵).
- The epilepsy-risk variant rs2228130 impaired inhibitory synaptic transmission, altered sleep phenotypes, and increased seizure susceptibility in experimental models.
- Knock-in mice exhibited epileptiform discharges, altered sleep architecture, and abnormal gene expression, which were partially ameliorated by interventions.
Conclusions:
- A protective genetic causal association exists between longer sleep duration and reduced epilepsy risk.
- Epilepsy genetic risk converges on broad functional networks, with inhibitory synaptic dysfunction identified as a key mechanistic link.
- Sleep optimization and targeted modulation of downstream pathways offer a rationale for epilepsy prevention and treatment.
