Abstract
Rapid eye movement (REM) sleep behavior disorder (RBD) is a prodromal condition for Parkinson’s disease (PD) and other synucleinopathies, which often occurs many years before the onset of PD. We analyzed 261 RBD patients and 379 controls for nine PD-associated SNPs and examined their effects, first upon on RBD risk and second, on eventual progression to synucleinopathies in a prospective follow-up in a subset of patients. The SCARB2 rs6812193 (OR = 0.67, 95 % CI = 0.51–0.88, p = 0.004) and the MAPT rs12185268 (OR–0.43, 95 % CI–0.26–0.72, p = 0.001) were associated with RBD in different models. Kaplan-Meier survival analysis in a subset of RBD patients (n = 56), demonstrated that homozygous carriers of the USP25 rs2823357 SNP had progressed to synucleinopathies faster than others (log-rank p = 0.003, Breslow p = 0.005, Tarone-Ware p = 0.004). As a proof-of-concept study, these results suggest that RBD may be associated with at least a subset of PD-associated genes, and demonstrate that combining genetic and prodromal clinical data may help identifying individuals that are either more or less susceptible to develop synucleinopathies. More studies are necessary to replicate these results, and identify more genetic factors affecting progression from RBD to synucleinopathies.
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Acknowledgments
We would like to thank the patients for their participating in this study. This work was financially supported by the Parkinson Society of Canada and by the Michael J Fox Foundation. ZGO is supported by a postdoctoral fellowship from the Canadian Institutes of Health Research (CIHR). JFG is supported by grants from CIHR and Fonds de Recherche Santé Québec (FRSQ). JM is supported by grants from CIHR. GAR holds a Canada Research Chair in Genetics of the Nervous System and the Wilder Pennfield Chair in Neurosciences.
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Z. Gan-Or and S. L. Girard contributed equally to this work.
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Gan-Or, Z., Girard, S.L., Noreau, A. et al. Parkinson’s Disease Genetic Loci in Rapid Eye Movement Sleep Behavior Disorder. J Mol Neurosci 56, 617–622 (2015). https://doi.org/10.1007/s12031-015-0569-7
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DOI: https://doi.org/10.1007/s12031-015-0569-7