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Ouled Amar Bencheikh, B.* ; Ruskey, J.A.* ; Arnulf, I.* ; Dauvilliers, Y.* ; Monaca, C.C.* ; De Cock, V.C.* ; Gagnon, J.F.* ; Spiegelman, D.* ; Hu, M.T.M.* ; Högl, B.* ; Stefani, A.* ; Ferini-Strambi, L.* ; Plazzi, G.* ; Antelmi, E.* ; Young, P.* ; Heidbreder, A.* ; Mollenhauer, B.* ; Sixel-Döring, F.* ; Trenkwalder, C.* ; Oertel, W.H. ; Montplaisir, J.Y.* ; Postuma, R.B.* ; Rouleau, G.A.* ; Gan-Or, Z.*

LRRK2 protective haplotype and full sequencing study in REM sleep behavior disorder.

Parkinsonism Relat. Disord. 52, 98-101 (2018)

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Background: Individuals with rapid eye movement (REM)-sleep behavior disorder (RBD) are likely to progress to synucleinopathies, mainly Parkinson's disease (PD), dementia with Lewy-bodies (DLB) and multiple system atrophy (MSA). The genetics of RBD only partially overlaps with PD and DLB, and the role of LRRK2 variants in risk for RBD is still not clear.Methods: The full coding sequence, exon-intron boundaries and 5' and 3' untranslated regions of LRRK2 were sequenced using targeted next-generation sequencing. A total of 350 RBD patients and 869 controls were sequenced, and regression and burden models were used to examine the association between LRRK2 variants and RBD.Results: No pathogenic mutations that are known to cause PD were identified in RBD patients. The p.N551K-p.R1398H-p.K1423K haplotype was associated with a reduced risk for RBD (OR = 0.66, 95% CI 0.44-0.98, p = 0.0055 for the tagging p.N551K substitution). A common variant, p.S1647T, was nominally associated with risk for RBD (OR = 1.28, 95% Cl 1.05-1.56, p = 0.029). Burden analysis identified associations with domains and exons that were derived by the variants of the protective haplotype, and no burden of other rare variants was identified.Conclusions: Carriers of the LRRK2 p.N551K-p.R1398H-p.K1423K haplotype have a reduced risk for developing RBD, yet PD-causing mutations probably have minor or no role in RBD. Additional work is needed to confirm these results and to identify the mechanism associated with reduced risk for RBD. (C) 2018 Elsevier Ltd. All rights reserved.

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