Genome-Wide Association Study Meta-Analysis for Parkinson Disease Motor Subtypes

Isabel Alfradique-Dunham, Rami Al-Ouran, Rainer Von Coelln, Cornelis Blauwendraat, Emily Hill, Lan Luo, Amanda Stillwell, Emily Young, Anita Kaw, Manuela Tan, Calwing Liao, Dena Hernandez, Lasse Pihlstrom, Donald Grosset, Lisa M. Shulman, Zhandong Liu, Guy A. Rouleau, Mike Nalls, Andrew B. Singleton, Huw MorrisJoseph Jankovic, Joshua M. Shulman

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


ObjectiveTo discover genetic determinants of Parkinson disease (PD) motor subtypes, including tremor dominant (TD) and postural instability/gait difficulty (PIGD) forms.MethodsIn 3,212 PD cases of European ancestry, we performed a genome-wide association study (GWAS) examining 2 complementary outcome traits derived from the Unified Parkinson's Disease Rating Scale, including dichotomous motor subtype (TD vs PIGD) or a continuous tremor/PIGD score ratio. Logistic or linear regression models were adjusted for sex, age at onset, disease duration, and 5 ancestry principal components, followed by meta-analysis.ResultsAmong 71 established PD risk variants, we detected multiple suggestive associations with PD motor subtype, including GPNMB (rs199351, psubtype = 0.01, pratio = 0.03), SH3GL2 (rs10756907, psubtype = 0.02, pratio = 0.01), HIP1R (rs10847864, psubtype = 0.02), RIT2 (rs12456492, psubtype = 0.02), and FBRSL1 (rs11610045, psubtype = 0.02). A PD genetic risk score integrating all 71 PD risk variants was also associated with subtype ratio (p = 0.026, ß = -0.04, 95% confidence interval = -0.07-0). Based on top results of our GWAS, we identify a novel suggestive association at the STK32B locus (rs2301857, pratio = 6.6 × 10-7), which harbors an independent risk allele for essential tremor.ConclusionsMultiple PD risk alleles may also modify clinical manifestations to influence PD motor subtype. The discovery of a novel variant at STK32B suggests a possible overlap between genetic risk for essential tremor and tremor-dominant PD.

Original languageEnglish
Article numbere557
JournalNeurology: Genetics
Issue number2
StatePublished - Apr 28 2021


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