CSF α-Synuclein Seed Amplification Assays and Skin Immunofluorescence: Clinical Applications, Research Opportunities,...

Area of Science:

• Neuroscience
• Biomarker Discovery
• Neurodegenerative Diseases

Background:

• Pathologic alpha-synuclein (aSyn) detection in vivo is crucial for neurodegeneration research.
• Synucleinopathies, including Parkinson disease and dementia with Lewy bodies, are characterized by aSyn aggregates.
• Early detection of at-risk individuals (e.g., those with REM sleep behavior disorder) is vital.

Purpose of the Study:

• To review evidence supporting cerebrospinal fluid (CSF) aSyn seed amplification assays (aSyn-SAA) and skin biopsy phospho-aSyn immunofluorescence (skin aSyn-IF) testing.
• To discuss the research applications of these biomarkers in clinical trials.
• To explore the current utility and limitations of these assays as diagnostic tools.

Main Methods:

• Review of published evidence on CSF aSyn-SAA and skin aSyn-IF.
• Analysis of assay performance in patients with synucleinopathies and at-risk individuals.
• Discussion of clinical utility and research applications.

Main Results:

• CSF aSyn-SAA and skin aSyn-IF assays detect pathologic aSyn forms in synucleinopathies.
• High positivity rates observed in individuals at risk for future aSyn-related diseases.
• These assays are now commercially available for clinical use.

Conclusions:

• CSF aSyn-SAA and skin aSyn-IF are valuable tools for research and potentially clinical care.
• Formal clinical use guidelines are needed due to commercial availability.
• Further research is required to address knowledge gaps and explore emerging developments.