Interesting to see these data published... I saw them presented at MDS Congress in San Diego in June 2015... supports the notion that GBA gives rise to a more unpleasant form of PD of which RBD is part. Also supports a role for the 'debated' GBA variants in PD such as E326K and backs up observations by Beavan et al, made earlier this year...
Ann Clin Transl Neurol. 2015 Sep;2(9):941-5. doi: 10.1002/acn3.228. Epub 2015 Jul 31.
Gan-Or Z, Mirelman A, Postuma RB, Arnulf I, Bar-Shira A, Dauvilliers Y, Desautels A, Gagnon JF, Leblond CS, Frauscher B, Alcalay RN, Saunders-Pullman R, Bressman SB, Marder K, Monaca C, Högl B, Orr-Urtreger A, Dion PA, Montplaisir JY, Giladi N, Rouleau GA.
Abstract
Rapid eye movement sleep behavior disorder and GBA mutations are both associated with Parkinson's disease. The GBA gene was sequenced in idiopathic rapid eye movement sleep behavior disorder patients (n = 265), and compared to controls (n = 2240). Rapid eye movement sleep behavior disorder questionnaire was performed in an independent Parkinson's disease cohort (n = 120). GBA mutations carriers had an OR of 6.24 (10.2% in patients vs. 1.8% in controls, P < 0.0001) for rapid eye movement sleep behavior disorder, and among Parkinson's disease patients, the OR for mutation carriers to have probable rapid eye movement sleep behavior disorder was 3.13 (P = 0.039). These results demonstrate that rapid eye movement sleep behavior disorder is associated with GBA mutations, and that combining genetic and prodromal data may assist in identifying individuals susceptible to Parkinson's disease.
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