Clinical Report: Pathological Mechanisms of Alzheimer’s Disease Associated with TREM2 Variants
Overview
This study investigates the pathological mechanisms associated with TREM2 variants R47H and R62H in Alzheimer's disease (AD). It highlights the differential genetic risks conferred by these variants and their impact on microglial, astrocytic, and neuronal interactions in AD pathology.
Background
Alzheimer's disease is a complex neurodegenerative disorder with significant genetic components influencing its onset and progression. Variants in the TREM2 gene have been linked to increased risk for late-onset AD, particularly the R47H and R62H variants. Understanding the mechanisms by which these variants affect cellular interactions in the brain is crucial for developing targeted therapies and improving patient outcomes.
Data Highlights
This study utilized immunohistochemistry and imaging mass cytometry to analyze brain samples from individuals with and without Alzheimer's disease, focusing on the impact of TREM2 variants on β-amyloid pathology.
Key Findings
The R47H variant confers a significantly higher relative risk for AD compared to the common variant alleles.
Both TREM2 variants (R47H and R62H) are associated with increased neuronal loss in post-mortem AD tissue.
Microglial pathology differs based on TREM2 genotype, influencing astrocytic and neuronal responses in AD.
Reduced β-amyloid clearance is observed in models with TREM2 knockout or the R47H variant.
CD33 variants may interact with TREM2, affecting microglial function and AD risk.
Clinical Implications
Clinicians should consider the genetic background of patients when assessing AD risk and pathology. Understanding the role of TREM2 variants can guide therapeutic strategies aimed at modulating microglial and neuronal interactions in Alzheimer's disease.
Conclusion
The findings underscore the importance of TREM2 variants in the pathogenesis of Alzheimer's disease, highlighting their role in microglial and neuronal interactions that contribute to disease progression.
by Nurun N. Fancy, Nanet Willumsen, Vicky M. N. Chau, Samuel L. Boulger, Harry J. Whitwell, Wenhao Wang, Baptiste Avot, Michael Thomas, Jonathan Talbot-Martin, Stergios Tsartsalis, Combiz Khozoie, Aisling McGarry, Eleonore Schneegans, Riad Yagoubi, To Ka Dorcas Cheung, Marianna Papageorgopoulou, Emily Adair, Benjamin Cooper, Karen Davey, Amy M. Smith, William Scotton, John Hardy, Paul M. Matthews, Johanna S. Jackson
