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Published on: January 7, 2014
Genome-Wide Association Study Meta-Analysis for Parkinson Disease Motor Subtypes
Isabel Alfradique-Dunham1, Rami Al-Ouran1, Rainer von Coelln1
1Department of Neurology (I.A.-D., E.H., L.L., A.S., E.Y., A.K., J.J., J.M.S.), Baylor College of Medicine, Houston, TX; Department of Pediatrics (R.A.-O., Z.L.), Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute (R.A.-O., Z.L., J.M.S.), Texas Childrens Hospital, Houston, TX; Department of Neurology (R.C., L.M.S.), University of Maryland School of Medicine, Baltimore, MD; Molecular Genetics Section (C.B., D.H., M.N., A.B.S.), Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD; Department of Clinical and Movement Neurosciences (M.T., H.M.), UCL Queen Square Institute of Neurology, University College London, London, UK; UCL Movement Disorders Centre (M.T., H.M.), UCL Queen Square Institute of Neurology, University College London, London, UK; Montreal Neurological Institute (C.L., G.A.R.), Montréal, Quebec, Canada; Department of Human Genetics (C.L., G.A.R.), McGill University, Montréal, Quebec, Canada; Department of Neurology (L.P.), Oslo University Hospital, Oslo, Norway; Department of Neurology (D.G.), Institute of Neurological Sciences, Queen Elizabeth University Hospital, Glasgow, UK; Department of Neurology and Neurosurgery (G.A.R.), McGill University, Montréal, Quebec, Canada; Data Tecnica International (M.N.), Glen Echo, MD; Parkinsons Disease Center and Movement Disorders Clinic (J.J., J.M.S.), Department of Neurology, Baylor College of Medicine, Houston, TX; Department of Molecular & Human Genetics (J.M.S.), Baylor College of Medicine, Houston, TX; and Department of Neuroscience (J.M.S.), Baylor College of Medicine, Houston, TX.
Genetic factors influence Parkinson disease motor subtypes. A novel variant in STK32B may link essential tremor and tremor-dominant Parkinson disease.
Area of Science:
- Neurogenetics
- Parkinson's Disease Research
- Genome-Wide Association Studies
Background:
- Parkinson disease (PD) presents with diverse motor symptoms, broadly categorized into tremor-dominant (TD) and postural instability/gait difficulty (PIGD) subtypes.
- Understanding the genetic underpinnings of these motor subtypes is crucial for personalized medicine and targeted therapeutic strategies in PD.
Purpose of the Study:
- To identify genetic determinants associated with distinct motor subtypes of Parkinson disease (PD).
- To explore the genetic overlap between PD motor subtypes and other neurological conditions, such as essential tremor.
Main Methods:
- A genome-wide association study (GWAS) was conducted on 3,212 European ancestry PD cases.
- Two outcome traits were analyzed: dichotomous motor subtype (TD vs. PIGD) and a continuous tremor/PIGD score ratio.
- Statistical analyses included logistic/linear regression, adjusted for covariates, followed by meta-analysis.
Main Results:
- Several suggestive associations were found between established PD risk variants and PD motor subtypes, including genes like GPNMB, SH3GL2, HIP1R, RIT2, and FBRSL1.
- A PD genetic risk score incorporating 71 PD risk variants was significantly associated with the subtype ratio.
- A novel suggestive association was identified at the STK32B locus (rs2301857), which is known to harbor a risk allele for essential tremor.
Conclusions:
- Genetic risk variants for Parkinson disease may also influence its clinical presentation, affecting motor subtypes.
- The identified STK32B variant suggests a potential shared genetic basis between essential tremor and the tremor-dominant form of PD.
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