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Updated: Jun 12, 2025
Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
Published on: October 15, 2019
Causal associations between gut microbiota, circulating inflammatory proteins, and epilepsy: a multivariable
Han Yang1, Wei Liu2, Tiantian Gao1
1Department of Neurology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
Background:
Previous studies have suggested that gut microbiota (GM) may be involved in the pathogenesis of epilepsy through the microbiota-gut-brain axis (MGBA). However, the causal relationship between GM and different epilepsy subtypes and whether circulating inflammatory proteins act as mediators to participate in epileptogenesis through the MGBA remain unclear. Therefore, it is necessary to identify specific GM associated with epilepsy and its subtypes and explore their underlying inflammatory mechanisms for risk prediction, personalized treatment, and prognostic monitoring of epilepsy.
Methods:
We hypothesized the existence of a pathway GM-inflammatory proteins-epilepsy. We found genetic variants strongly associated with GM, circulating inflammatory proteins, epilepsy and its subtypes, including generalized and partial seizures, from large-scale genome-wide association studies (GWAS) summary data and used Multivariate Mendelian Randomization to explore the causal relationship between the three and whether circulating inflammatory proteins play a mediating role in the pathway from GM to epilepsy, with inverse variance weighted (IVW) method as the primary statistical method, supplemented by four methods: MR-Egger, weighted median estimator (WME), Weighted mode and Simple mode.
Results:
16 positive and three negative causal associations were found between the genetic liability of GM and epilepsy and its subtypes. There were nine positive and nine negative causal associations between inflammatory proteins and epilepsy and its subtypes. Furthermore, we found that C-X-C motif chemokine 11 (CXCL11) levels mediated the causal association between Genus Family XIII AD3011 group and epilepsy.
Conclusion:
Our study highlights the possible causal role of specific GM and specific inflammatory proteins in the development of epilepsy and suggests that circulating inflammatory proteins may mediate epileptogenesis through the MGBA.
Insights
This study reveals a causal link between gut microbiota (GM) and epilepsy, mediated by inflammatory proteins via the microbiota-gut-brain axis (MGBA). Specific GM and inflammatory markers like CXCL11 are implicated in epilepsy development.
Area of Science:
- Neuroscience
- Microbiology
- Immunology
Background:
- Gut microbiota (GM) involvement in epilepsy pathogenesis via the microbiota-gut-brain axis (MGBA) is suggested.
- The causal relationship between GM, epilepsy subtypes, and the mediating role of inflammatory proteins remains unclear.
- Identifying specific GM and inflammatory mechanisms is crucial for epilepsy risk prediction and management.
Purpose of the Study:
- To investigate the causal relationship between GM, inflammatory proteins, and epilepsy subtypes.
- To determine if inflammatory proteins mediate the pathway from GM to epilepsy.
- To identify specific GM and inflammatory markers associated with epilepsy.
Main Methods:
- Utilized large-scale genome-wide association studies (GWAS) summary data.
- Employed Multivariate Mendelian Randomization (MR) with Inverse Variance Weighted (IVW) as the primary method.
- Supplemented MR analysis with MR-Egger, Weighted Median Estimator, Weighted Mode, and Simple Mode.
Main Results:
- Identified 16 positive and 3 negative causal associations between GM genetic liability and epilepsy.
- Found 9 positive and 9 negative causal associations between inflammatory proteins and epilepsy.
- Demonstrated that CXCL11 levels mediate the causal link between a specific gut bacterial group and epilepsy.
Conclusions:
- Specific gut microbiota and inflammatory proteins likely play a causal role in epilepsy development.
- Circulating inflammatory proteins may mediate epileptogenesis through the microbiota-gut-brain axis.
- Findings support targeted interventions focusing on GM and inflammation for epilepsy treatment.
