RT Journal Article T1 Heterogeneity of prodromal Parkinson symptoms in siblings of Parkinson disease patients. A1 Baldelli, Luca A1 Schade, Sebastian A1 Jesús, Silvia A1 Schreglmann, Sebastian R A1 Sambati, Luisa A1 Gómez-Garre, Pilar A1 Halsband, Claire A1 Calandra-Buonaura, Giovanna A1 Adarmes-Gómez, Astrid Daniela A1 Sixel-Döring, Friederike A1 Zenesini, Corrado A1 Pirazzini, Chiara A1 Garagnani, Paolo A1 Bacalini, Maria Giulia A1 Bhatia, Kailash P A1 Cortelli, Pietro A1 Mollenhauer, Brit A1 Franceschi, Claudio A1 PROPAG-AGEING consortium, A1 Mir, Pablo A1 Trenkwalder, Claudia A1 Provini, Federica AB A prodromal phase of Parkinson's disease (PD) may precede motor manifestations by decades. PD patients' siblings are at higher risk for PD, but the prevalence and distribution of prodromal symptoms are unknown. The study objectives were (1) to assess motor and non-motor features estimating prodromal PD probability in PD siblings recruited within the European PROPAG-AGEING project; (2) to compare motor and non-motor symptoms to the well-established DeNoPa cohort. 340 PD siblings from three sites (Bologna, Seville, Kassel/Goettingen) underwent clinical and neurological evaluations of PD markers. The German part of the cohort was compared with German de novo PD patients (dnPDs) and healthy controls (CTRs) from DeNoPa. Fifteen (4.4%) siblings presented with subtle signs of motor impairment, with MDS-UPDRS-III scores not clinically different from CTRs. Symptoms of orthostatic hypotension were present in 47 siblings (13.8%), no different to CTRs (p = 0.072). No differences were found for olfaction and overall cognition; German-siblings performed worse than CTRs in visuospatial-executive and language tasks. 3/147 siblings had video-polysomnography-confirmed REM sleep behavior disorder (RBD), none was positive on the RBD Screening Questionnaire. 173/300 siblings had SN 2373-8057 YR 2021 FD 2021-09-07 LK http://hdl.handle.net/10668/18499 UL http://hdl.handle.net/10668/18499 LA en DS RISalud RD Apr 6, 2025