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Published online before print April 23, 2008, doi:10.1212/01.wnl.0000304039.11891.29)
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Received August 15, 2007
Accepted October 22, 2007

Genotype—phenotype correlations between GBA mutations and Parkinson disease risk and onset

Z. Gan-Or , N. Giladi MD, U. Rozovski MD, C. Shifrin MSc, S. Rosner MD, T. Gurevich MD, A. Bar-Shira PhD, and A. Orr-Urtreger MD, PhD*

From The Genetic Institute (Z.G.-O., U.R., C.S., S.R., A.B.-S., A.O.-U.) and Movement Disorders Unit, Parkinson Center, Department of Neurology (N.G., C.S., T.G.), Tel-Aviv Sourasky Medical Center; and The Sackler Faculty of Medicine (Z.G.-O., N.G., C.S., T.G., A.O.-U.), Tel-Aviv University, Israel.


* To whom correspondence should be addressed. E-mail: aviorr{at}tasmc.health.gov.il.

Background: Mutations in GBA and LRRK2 genes have been implicated in Parkinson disease (PD), particularly in Ashkenazi Jews.

Methods: An Israeli Ashkenazi cohort of 420 patients with PD, 333 elderly controls, and 3,805 young controls was screened for eight GBA mutations, which are associated with mild (N370S, R496H) and severe (84GG, IVS2 + 1, V394L, D409H, L444P, RecTL) Gaucher disease. Patients with PD and elderly controls were also genotyped for LRRK2 G2019S.

Results: GBA carrier frequency was 17.9% in patients with PD compared to 4.2% in elderly and 6.35% in young controls. The proportion of severe mutation carriers among patients with PD-GBA carriers was 29% compared to 7% among young controls. Severe and mild GBA mutations increased the risk of developing PD by 13.6- and 2.2-fold, and affected the average age at PD onset (AAO), 55.7 and 57.9 years, compared to 60.7 years in patients without known GBA or LRRK2 mutations.

Conclusions: These data demonstrate genotype-phenotype correlations between different GBA mutations and Parkinson disease (PD) risk and AAO in Ashkenazi Jews. Additionally, an earlier AAO was observed in LRRK2 G2019S carrier patients with PD. Finally, these data demonstrate that a surprisingly high frequency, more than one third of our patient population, carried a mutation in GBA or LRRK2.




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E. Rogaeva and J. Hardy
Gaucher and Parkinson diseases: Unexpectedly related
Neurology, June 10, 2008; 70(24): 2272 - 2273.
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