Synucleinopathies

Cutting-edge clarity for challenging neurodegenerative disorders

Including dementia with Lewy bodies (DLB), Parkinson’s disease (PD), and multiple system atrophy (MSA), synucleinopathies are a diverse group of conditions characterized by the aberrant misfolding of the α-synuclein protein in neurons. Because these conditions are associated with faster cognitive decline, more rapid disease progression, poorer prognosis, and treatment contraindications compared to classic Alzheimer’s disease and other neurodegenerative conditions, identifying synuclein pathology is imperative to provide patients with the best possible care. Evaluating for the presence of misfolded α-synuclein in cerebrospinal fluid (CSF) can equip physicians with precise answers to diagnose, stratify, and manage their patients.1

Synucleinopathy test menu

Synucleinopathy testing

The SAAmplify™–αSYN is a first-in-class seed amplification assay for the detection of misfolded α-synuclein in cerebrospinal fluid. Intended for patients with clinically uncertain cognitive decline or Parkinsonian syndromes, results can help diagnose synucleinopathies, such as PD, DLB, Alzheimer's disease with Lewy body pathology (AD-LB), and MSA. The SAAmplify–αSYN assay is the only seed amplification assay commercially available to detect synucleinopathies in CSF and can accurately identify α-syn pathology even before definitive symptoms appear.

Key testing

Advantages

  • Helps resolve challenging differential diagnoses with confidence, speed, and clarity.
  • Offers 96% sensitivity and 92% specificity in the detection of α-synuclein pathology.4,5
  • Provides differential clarity to rule out many PD mimics and AD-LB with mixed pathology.
  • Provides clear results with:
    • Detected-1 result indicates neuronal synuclein disease (e.g., PD, DLB, AD-LB).
    • Detected-2 result is consistent with pathology found predominantly in patients with MSA. (Validation is underway to enhance the sensitivity in detecting MSA aggregates.)
    • Not detected result indicates misfolded α-synuclein aggregates not detected. This result is inconsistent with a pathological diagnosis of synucleinopathy.6

Additional information

Dementia with Lewy bodies (DLB) is the most common type of dementia after Alzheimer’s disease (AD) dementia. Unlike classic AD, which impacts memory, language, and behavior, DLB affects executive function, speed of cognition, movement, mood, and memory. Often, an early presenting symptom of DLB is hallucinations. Because DLB progresses more quickly than classic AD, has a poorer prognosis, and responds adversely to certain medications often used to treat psychosis and agitation (e.g., Ativan and Haldol), early, accurate diagnosis is critical. Diagnostic clarity not only enables accurate prognosis, it also allows for the selection of safer medication alternatives and time to plan for supportive care needed by patients to maintain and enhance their quality of life.


References
  1.  Tosun D, Hausle Z, Thropp P, et al. Alzheimer's Disease Neuroimaging Initiative; Blauwendraat C. Association of CSF α-synuclein seed amplification assay positivity with disease progression and cognitive decline: A longitudinal Alzheimer's Disease Neuroimaging Initiative study. Alzheimers Dement. 2024 Dec;20(12):8444-8460. https://doi.org/10.1002/alz.14276 Epub 2024 Oct 20. PMID: 39428831; PMCID: PMC11667524.
  2. Ding Y, Wang L, Liu J, Deng Y, Jiao Y, Zhao A. Distinct CSF α-synuclein aggregation profiles associated with Alzheimer's disease phenotypes and MCI-to-AD conversion. The J Prev Alzheimers Dis. Volume 12, Issue 2, 2025,100040, ISSN 2274-5807. https://doi.org/10.1016/j.tjpad.2024.100040
  3. Beach T, Adler C. Importance of low diagnostic accuracy for early Parkinson’s disease. Mov Disord. 2018 Oct;33(10): 1551-1554.
  4. Ma Y, Farris C, Weber S, et al. Sensitivity and specificity of a seed amplification assay for diagnosis of multiple system atrophy: a multicentre cohort study. Lancet Neurol. 2024 Dec;23(12):1225-1237.
  5. Rossi M, Candelise N, Baiardi S, et al. Ultrasensitive RT-QuIC assay with high sensitivity and specificity for Lewy body-associated synucleinopathies. Acta Neuropathol. 2020 Jul;140(1):49-62. https://doi.org/10.1007/s00401-020-02160-8. Epub 2020 Apr 27. Erratum in: Acta Neuropathol. 2020 Aug;140(2):245. https://doi.org/10.1007/s00401-020-02170-6 PMID: 32342188; PMCID: PMC7299922.
  6. Vaughan, D, Fumi, R, Theilmann Jensen, M, et al. Evaluation of cerebrospinal fluid α-synuclein seed amplification assay in progressive supranuclear palsy and corticobasal syndrome. Mov Disord. 2024 39: 2285-2291. https://doi.org/10.1002/mds.30019
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