Spatial transcriptomic patterns underlying amyloid-β and tau pathology are associated with cognitive dysfunction in...

Area of Science:

• Neuroscience
• Genetics
• Alzheimer's Disease Research

Background:

• Alzheimer's disease (AD) is characterized by the accumulation of amyloid-beta (Aβ) and tau proteins in specific neuronal systems.
• The reasons for differential vulnerability of brain regions to Aβ and tau pathologies remain unclear, with gene expression potentially playing a significant role.
• Understanding the relationship between gene expression and regional pathology is crucial for elucidating AD pathogenesis.

Purpose of the Study:

• To investigate the association between brain-wide gene expression profiles and regional vulnerability to Aβ and tau pathologies in Alzheimer's disease.
• To identify Alzheimer's disease susceptibility genes and gene modules linked to regional pathology.
• To explore the distinct biochemical pathways underlying gene-to-Aβ and gene-to-tau associations and their link to cognitive dysfunction.

Main Methods:

• Analysis of brain-wide gene expression profiles in two large, independent Alzheimer's disease cohorts.
• Identification of gene-to-Aβ and gene-to-tau associations related to regional pathology vulnerability.
• Utilizing gene co-expression network analysis to identify relevant gene modules.
• Pathway analysis to determine distinct biochemical pathways associated with gene-pathology links.
• Development of a framework to connect gene-pathology associations to individual-level cognitive decline.

Main Results:

• Identification of specific Alzheimer's disease susceptibility genes and gene modules associated with regional vulnerability to Aβ and tau pathologies.
• Discovery of distinct biochemical pathways linked to gene-to-Aβ and gene-to-tau associations, potentially explaining discordance in regional pathologies.
• Establishment of a framework linking gene-to-pathology associations to cognitive dysfunction at the individual level.

Conclusions:

• Gene expression profiles are significantly associated with regional vulnerability to amyloid-beta and tau pathologies in Alzheimer's disease.
• Distinct biochemical pathways mediate the relationship between gene expression and Aβ versus tau pathologies, offering insights into their differential distribution.
• The identified gene-pathology associations have potential clinical implications for understanding and potentially treating cognitive decline in Alzheimer's disease.