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[Preprint]. 2024 Feb 29:2024.02.28.24303478. [Version 1] doi: 10.1101/2024.02.28.24303478

Evaluation of cerebrospinal fluid alpha-synuclein seed amplification assay in PSP and CBS

DP Vaughan, R Fumi, M Theilmann Jensen, T Georgiades, L Wu, D Lux, R Obrocki, J Lamoureux, O Ansorge, KSJ Allinson, TT Warner, Z Jaunmuktane, A Misbahuddin, PN Leigh, BCP Ghosh, KP Bhatia, A Church, C Kobylecki, MTM Hu, JB Rowe, C Blauwendraat, HR Morris, E Jabbari
PMCID: PMC10962751  PMID: 38529496

Abstract

Background

Seed amplification assay (SAA) testing has become an important biomarker in the diagnosis of alpha-synuclein related neurodegenerative disorders.

Objectives

To assess the rate of alpha-synuclein SAA positivity in progressive supranuclear palsy (PSP) and corticobasal syndrome (CBS), and analyse the clinical and pathological features of SAA positive and negative cases.

Methods

106 CSF samples from clinically diagnosed PSP (n=59), CBS (n=37) and indeterminate parkinsonism cases (n=10) were analysed using alpha-synuclein SAA.

Results

Three cases (1 PSP, 2 CBS) were Multiple System Atrophy (MSA)-type SAA positive. 5/59 (8.5%) PSP cases were Parkinson’s disease (PD)-type SAA positive, and these cases were older and had a shorter disease duration compared with SAA negative cases. In contrast, 9/35 (25.7%) CBS cases were PD-type SAA positive.

Conclusions

Our results suggest that PD-type seeds can be detected in PSP and CBS using a CSF alpha-synuclein SAA, and in PSP this may impact on clinical course.

Full Text Availability

The license terms selected by the author(s) for this preprint version do not permit archiving in PMC. The full text is available from the preprint server.


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