SARS-CoV-2 Enfeksiyonunu Takip Eden Olfaktör Mukozada Alfa-Synüklein Tohumlama Etkinliğinin Yaygınlığı - Pilot Çalışmadan Sonuçlar

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Abstract Background Olfactory dysfunction (OD) is a hallmark of SARS-CoV-2-infection where it is believed to result from neuroinflammation induced by viral invasion via the olfactory mucosa (OM). Hyposmia also affects the majority of patients with Parkinson’s disease (PD) where it is caused by α-synuclein (aSyn) pathology in the olfactory system, and aSyn-seeding-activity can be detected in the OM using aSyn-seeding-amplification-assays (aSyn-SAA). The present pilot study aimed to investigate whether SARS-CoV-2-infection induces local aSyn-misfolding and -aggregation in OM samples using aSyn-SAA. Methods We conducted an observational study including PD patients (n = 51), individuals with a history of documented symptomatic SARS-CoV-2-infection (post-COVID; n = 98), and healthy controls (HC; n = 42). Post-COVID-participants were stratified based on persistent OD (COVID + OD; n = 44) or normal olfaction (COVID–OD; n = 54) using Sniffin’-Sticks-Identification (SSI) and -Discrimination (SSD) tests. OM samples were obtained by ENT specialists and analyzed by aSyn-SAA at the University of Verona. Clinical phenotyping included MDS-UPDRS, MoCA, and the Innsbruck-RBD-Inventory. Results OM-SAA positivity rates were significantly different between PD and both post-COVID-participants and HCs (80.4% vs 23.4% vs 11.9%; p 

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