Cross-species transcriptomic analysis of rodent model fidelity to human mesial temporal lobe epilepsy

Area of Science:

• Neuroscience
• Epilepsy Research
• Transcriptomics

Background:

• Mesial temporal lobe epilepsy (MTLE) is a frequent epilepsy type resistant to drugs.
• Reliable rodent models are crucial for MTLE research, but their molecular accuracy is often uncertain.
• Existing models reproduce seizures but may not fully reflect human MTLE molecular pathology.

Purpose of the Study:

• To conduct an integrative analysis of human MTLE transcriptomic data.
• To evaluate and compare transcriptomic profiles of rodent epilepsy models against human MTLE data.
• To identify the most suitable rodent models for studying human MTLE.

Main Methods:

• Integrated transcriptomic data from 694 human MTLE samples and 362 rodent epilepsy model samples.
• Performed cross-species correlation analysis to compare molecular profiles.
• Evaluated models based on their resemblance to human MTLE transcriptomic signatures, including neuroinflammation and gliogenesis.

Main Results:

• Identified synaptic dysfunction, neuroinflammation, and gliogenesis in human chronic drug-resistant MTLE.
• The intrahippocampal kainate-induced model showed high similarity to human MTLE with hippocampal sclerosis (HS), characterized by neuroinflammation and gliogenesis.
• The perforant path stimulation model correlated well with MTLE without HS, indicating distinct mechanisms like synaptic remodeling.

Conclusions:

• This cross-species analysis clarifies the transcriptomic landscape of human MTLE.
• The study provides a framework for selecting appropriate rodent models based on transcriptomic fidelity.
• Highlights the importance of matching model characteristics (e.g., inflammation, synaptic remodeling) to specific human MTLE subtypes.