Panoramic Visualization of Circulating MicroRNAs Across Neurodegenerative Diseases in Humans

Area of Science:

• Neuroscience and Molecular Biology
• Genomics and Proteomics
• Biomarker Discovery

Background:

• Neurodegenerative diseases (NDs) present a significant global health challenge, with distinct molecular mechanisms often studied in isolation.
• Existing research has not collectively visualized the underlying molecular pathways common to various NDs, hindering holistic understanding and treatment strategies.
• High-throughput genomic and proteomic technologies offer novel opportunities to explore these complex diseases from a unified perspective.

Purpose of the Study:

• To collectively visualize the underlying molecular mechanisms of major neurodegenerative diseases (NDs) for the first time.
• To identify shared and distinct microRNA (miRNA) signatures and functional pathways across Alzheimer's disease (AD), Parkinson's disease (PD), multiple sclerosis (MS), and amyotrophic lateral sclerosis (ALS).
• To explore the potential of circulating miRNAs as unified biomarkers and therapeutic targets for NDs.

Main Methods:

• Construction of a comprehensive knowledge base of differentially expressed miRNAs in body fluids of ND patients.
• Application of various bioinformatic analyses to elucidate functional intersections and differences between AD, PD, ALS, and MS.
• Identification of common miRNAs and associated pathways implicated in neurodegeneration.

Main Results:

• A panoramic view of functional intersections at the miRNA and gene levels was established for AD, PD, MS, and ALS.
• The microRNA hsa-miR-30b-5p was identified as a unique overlapping signature across all four studied NDs, with significant functional roles.
• Evidence of functional convergence of miRNAs was found in pathways critical for neuron survival, including fatty acid metabolism and ECM receptor interactions.

Conclusions:

• Viewing NDs collectively reveals critical molecular insights, highlighting shared pathways and miRNA signatures.
• The identification of overlapping miRNAs like hsa-miR-30b-5p provides a promising avenue for developing unified biomarkers for diverse neurodegenerative conditions.
• These findings support the potential development of miRNA-based therapeutics and a more holistic approach to diagnosing and treating neurodegenerative diseases.