Mapping Post-Translational Modifications in Brain Regions in Alzheimer's Disease Using Proteomics Data Mining

Area of Science:

• Neuroscience
• Biochemistry
• Genomics

Background:

• Alzheimer's disease (AD) is a major cause of dementia.
• Understanding AD pathophysiology requires advanced molecular analyses.
• Proteomics and post-translational modification (PTM) analyses offer novel insights.

Purpose of the Study:

• To comprehensively analyze PTMs in various brain regions of AD patients.
• To identify proteins with PTMs differentially expressed across AD progression stages (Braak stages).
• To explore the functional pathways associated with these modified proteins in AD.

Main Methods:

• Utilized publicly available proteomics data from nine brain regions across three Braak stages.
• Identified and quantified peptides with PTMs.
• Performed Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis.

Main Results:

• Identified thousands of peptides with PTMs across different brain regions and Braak stages.
• Discovered 103 proteins with PTMs uniquely associated with intermediate and severe tangle stages.
• Pathway analysis linked these proteins to platelet activation, the tricarboxylic acid (TCA) cycle, and reactive oxygen species detoxification.

Conclusions:

• Multi-PTM data enhances understanding of AD neurobiology.
• Omics systems science holds promise for neurodegenerative disease research.
• Identified PTMs provide a platform for new hypotheses on AD pathogenesis.