Exploring Synaptic Pathways in Traumatic Brain Injury: A Cross-Phenotype Genomics Approach
Savvina Prapiadou1,2,3, Ernst Mayerhofer2,3,4, Marios K Georgakis3,5
1University of Patras Medical School, Patras, Greece.
Journal of Neurotrauma
|September 12, 2024
Summary
Traumatic brain injury (TBI) recovery may be improved by targeting shared synaptic pathways with neuropsychiatric conditions. This study identified specific cholinergic and serotonergic pathways involved in TBI outcomes and schizophrenia.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Traumatic brain injury (TBI) is a leading cause of death and disability globally, with limited effective treatments.
- Synaptic remodeling is a key factor influencing TBI outcomes.
- Understanding shared mechanisms between TBI and other neuropsychiatric conditions can reveal novel therapeutic targets.
Purpose of the Study:
- To investigate shared synaptic maintenance mechanisms between TBI and other neuropsychiatric conditions.
- To identify novel treatment targets for TBI by analyzing genome-wide genotype data and pathway enrichment.
- To explore pathophysiological overlaps between TBI and conditions like Alzheimer's disease, schizophrenia, and autism spectrum disorder.
Main Methods:
- Utilized an integrative approach combining genome-wide association studies (GWAS) with pathway and gene-set enrichment analyses (MAGMA, e-MAGMA, H-MAGMA).
- Employed literature review and the Reactome database to identify synapse-related pathways in TBI.
- Applied Mendelian randomization to assess potential causal associations between identified pathways and TBI outcomes.
Main Results:
- Out of 98 tested pathways, 32 were significantly enriched across the studied conditions.
- Five pathways were significantly enriched in TBI outcomes: "Serotonin clearance from the synaptic cleft," "Presynaptic nicotinic acetylcholine receptors," "Postsynaptic nicotinic acetylcholine receptors," "Highly sodium permeable postsynaptic acetylcholine nicotinic receptors," and "Acetylcholine binding and downstream events."
- Three of these pathways showed significant overlap between TBI and schizophrenia (SCZ), indicating shared pathophysiological mechanisms.
Conclusions:
- The cholinergic and serotonergic systems are implicated in TBI recovery.
- Shared synaptic pathway enrichments between TBI and SCZ suggest common underlying pathobiology.
- Integrative genomic analysis provides insights into TBI pathophysiology and potential therapeutic strategies by highlighting overlaps with other brain disorders.
