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Updated: Jun 14, 2025
Author Spotlight: In Vitro Co-Culture Model for Studying Microglia-Neuronal Interactions in Disease Conditions
Published on: July 26, 2024
Interpretation of Neurodegenerative GWAS Risk Alleles in Microglia and their Interplay with Other Cell Types
Inge R Holtman1, Christopher K Glass2,3, Alexi Nott4,5
1Department of Biomedical Sciences, Section Molecular Neurobiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
Abstract:
Microglia have been implicated in numerous neurodegenerative and neuroinflammatory disorders; however, the causal contribution of this immune cell type is frequently debated. Genetic studies offer a unique vantage point in that they infer causality over a secondary consequence. Genome-wide association studies (GWASs) have identified hundreds of loci in the genome that are associated with susceptibility to neurodegenerative disorders. GWAS studies implicate microglia in the pathogenesis of Alzheimer's disease (AD), Parkinson's disease (PD), multiple sclerosis (MS), and to a lesser degree suggest a role for microglia in vascular dementia (VaD), frontotemporal dementia (FTD), and amyotrophic lateral sclerosis (ALS), and other neurodegenerative and neuropsychiatric disorders. The contribution and function of GWAS risk loci on disease progression is an ongoing field of study, in which large genomic datasets, and an extensive framework of computational tools, have proven to be crucial. Several GWAS risk loci are shared between disorders, pointing towards common pleiotropic mechanisms. In this chapter, we introduce key concepts in GWAS and post-GWAS interpretation of neurodegenerative disorders, with a focus on GWAS risk genes implicated in microglia, their interplay with other cell types and shared convergence of GWAS risk loci on microglia.
Insights
Genome-wide association studies (GWASs) reveal microglia
Area of Science:
- Neuroimmunology and Genetics
- Genomic association studies in neurodegeneration
Background:
- Microglia's role in neurodegenerative diseases is debated, often considered a consequence rather than a cause.
- Genetic studies, particularly Genome-Wide Association Studies (GWASs), provide causal insights into disease susceptibility.
- Hundreds of genetic loci linked to neurodegenerative disorders have been identified through GWASs.
Purpose of the Study:
- To introduce key concepts in GWAS and post-GWAS interpretation for neurodegenerative disorders.
- To highlight the role of microglia in the pathogenesis of Alzheimer's disease, Parkinson's disease, and multiple sclerosis.
- To discuss shared genetic risk loci and their convergence on microglial function.
Main Methods:
- Review of Genome-Wide Association Studies (GWASs) findings in neurodegenerative diseases.
- Analysis of large genomic datasets and computational tools for interpreting GWAS risk loci.
- Focus on genetic risk genes implicated in microglial function and their cellular interactions.
Main Results:
- GWASs strongly implicate microglia in Alzheimer's disease, Parkinson's disease, and multiple sclerosis pathogenesis.
- Microglia also show suggested roles in vascular dementia, frontotemporal dementia, and amyotrophic lateral sclerosis.
- Identification of shared GWAS risk loci across disorders suggests common pleiotropic mechanisms involving microglia.
Conclusions:
- Genetic evidence increasingly supports a causal role for microglia in neurodegenerative and neuroinflammatory disorders.
- Understanding GWAS risk loci in microglia is crucial for deciphering disease mechanisms and developing targeted therapies.
- Shared genetic pathways highlight the central role of microglia in the convergence of multiple neurodegenerative conditions.
