1. Single‐Molecule Counting Coupled to Rapid Amplification Enables Detection of α‐Synuclein Aggregates in Cerebrospinal Fluid of Parkinson's Disease Patients
- Author
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Chloe Magnan, Yann Gambin, Akshay Bhumkar, Derrick Lau, Eugene Soh Wei Jun, Emma Sierecki, and Nicolas Dzamko
- Subjects
Adult ,Male ,isothermal amplification ,Parkinson's disease ,Amyloid ,Loop-mediated isothermal amplification ,Computational biology ,Protein aggregation ,Single‐Molecule Counting | Hot Paper ,010402 general chemistry ,01 natural sciences ,Catalysis ,Protein Aggregates ,chemistry.chemical_compound ,α-synuclein ,Cerebrospinal fluid ,Limit of Detection ,medicine ,Humans ,single-molecule counting ,Research Articles ,Aged ,Synucleinopathies ,010405 organic chemistry ,Chemistry ,Parkinson Disease ,Single molecule counting ,General Medicine ,General Chemistry ,Middle Aged ,medicine.disease ,Single Molecule Imaging ,0104 chemical sciences ,Biomarker (cell) ,alpha-Synuclein ,Biophysics ,Synuclein ,Female ,Thioflavin ,confocal spectroscopy ,Biomarkers ,Research Article - Abstract
α‐Synuclein aggregation is a hallmark of Parkinson's disease and a promising biomarker for early detection and assessment of disease progression. The prospect of a molecular test for Parkinson's disease is materializing with the recent developments of detection methods based on amplification of synuclein seeds (e.g. RT‐QuIC or PMCA). Here we adapted single‐molecule counting methods for the detection of α‐synuclein aggregates in cerebrospinal fluid (CSF), using a simple 3D printed microscope. Single‐molecule methods enable to probe the early events in the amplification process used in RT‐QuIC and a precise counting of ThT‐positive aggregates. Importantly, the use of single‐molecule counting also allows a refined characterization of the samples and fingerprinting of the protein aggregates present in CSF of patients. The fingerprinting of size and reactivity of individual aggregate shows a unique signature for each PD patients compared to controls and may provide new insights on synucleinopathies in the future., A new single‐molecule method was established for the detection of α‐synuclein fibrils, a promising biomarker of Parkinson's disease (PD). Individual ThT(+) aggregates were fingerprinted and amplified to improve detection limits by 3 orders of magnitude, compared to direct detection. A difference of behaviour was detected between PD and control samples.
- Published
- 2021