Journal of Movement Disorders

Original Articles

The Effect of Blood Lipids, Type 2 Diabetes, and Body Mass Index on Parkinson’s Disease: A Korean Mendelian Randomization Study: Kye Won Park, Yun Su Hwang, Seung Hyun Lee, Sungyang Jo, Sun Ju Chung; J Mov Disord. 2023;16(1):79-85. Published online January 12, 2023; DOI: https://doi.org/10.14802/jmd.22175

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Objective
Associations between various metabolic conditions and Parkinson’s disease (PD) have been previously identified in epidemiological studies. We aimed to investigate the causal effect of lipid levels, type 2 diabetes mellitus (T2DM), and body mass index (BMI) on PD in a Korean population via Mendelian randomization (MR).
Methods
Two-sample MR analyses were performed with inverse-variance weighted (IVW), weighted median, and MR-Egger regression approaches. We identified genetic variants associated with lipid concentrations, T2DM, and BMI in publicly available summary statistics, which were either collected from genome-wide association studies (GWASs) or from meta-analyses of GWAS that targeted only Korean individuals or East Asian individuals, including Korean individuals. The outcome dataset was a GWAS on PD performed in a Korean population.
Results
From previous GWASs and meta-analyses, we selected single nucleotide polymorphisms as the instrumental variables. Variants associated with serum levels of low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, and triglycerides, as well as with T2DM and BMI, were selected (n = 11, 19, 17, 89, and 9, respectively). There were no statistically significant causal associations observed between the five exposures and PD using either the IVW, weighted median, or MR-Egger methods (p-values of the IVW method: 0.332, 0.610, 0.634, 0.275, and 0.860, respectively).
Conclusion
This study does not support a clinically relevant causal effect of lipid levels, T2DM, and BMI on PD risk in a Korean population.

Citations

Citations to this article as recorded by

Genetic evidence for the liver-brain axis: lipid metabolism and neurodegenerative disease risk
Zeyu Wang, Zixiao Yin, Guangyong Sun, Dong Zhang, Jianguo Zhang
Lipids in Health and Disease.2025;[Epub] CrossRef
Causal effect of systemic lupus erythematosus on psychiatric disorders: A two-sample Mendelian randomization study
Hua Xue, Shuangjuan Liu, Li Zeng, Wenhui Fan
Journal of Affective Disorders.2024; 347: 422. CrossRef
Causal relationship between diabetes mellitus, glycemic traits and Parkinson’s disease: a multivariable mendelian randomization analysis
Qitong Wang, Benchi Cai, Lifan Zhong, Jitrawadee Intirach, Tao Chen
Diabetology & Metabolic Syndrome.2024;[Epub] CrossRef
Association of Body Mass Index and Parkinson Disease
Cloé Domenighetti, Pierre-Emmanuel Sugier, Ashwin Ashok Kumar Sreelatha, Claudia Schulte, Sandeep Grover, Berta Portugal, Pei-Chen Lee, Patrick May, Dheeraj Bobbili, Milena Radivojkov Blagojevic, Peter Lichtner, Andrew B. Singleton, Dena Hernandez, Connor
Neurology.2024;[Epub] CrossRef
Causal association between common rheumatic diseases and arrhythmia: a Mendelian randomization study
Yuchen Zhang, Ling Tang, Ke Zhang, Xinai Meng, Tian Liu, Yanjia Chen, Xingfu Huang
Frontiers in Cardiovascular Medicine.2024;[Epub] CrossRef
Unraveling the link: exploring the causal relationship between diabetes, multiple sclerosis, migraine, and Alzheimer’s disease through Mendelian randomization
Hua Xue, Li Zeng, Shuangjuan Liu
Frontiers in Neuroscience.2023;[Epub] CrossRef
Glycated hemoglobin A1c, cerebral small vessel disease burden, and disease severity in Parkinson's disease
Xinxin Ma, Shuhua Li, Fengzhi Liu, Yu Du, Haibo Chen, Wen Su
Annals of Clinical and Translational Neurology.2023; 10(12): 2276. CrossRef

Association of Depression With Early Occurrence of Postural Instability in Parkinson’s Disease: Yun Su Hwang, Sungyang Jo, Kye Won Park, Seung Hyun Lee, Sangjin Lee, Sun Ju Chung; J Mov Disord. 2023;16(1):68-78. Published online December 20, 2022; DOI: https://doi.org/10.14802/jmd.22091

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Objective
Depression in Parkinson’s disease (PD) affects the quality of life of patients. Postural instability and gait disturbance are associated with the severity and prognosis of PD. We investigated the association of depression with axial involvement in early-stage PD patients.
Methods
This study involved 95 PD patients unexposed to antiparkinsonian drugs. After a baseline assessment for depression, the subjects were divided into a depressed PD group and a nondepressed PD group. Analyses were conducted to identify an association of depression at baseline with the following outcome variables: the progression to Hoehn and Yahr scale (H-Y) stage 3, the occurrence of freezing of gait (FOG), levodopa-induced dyskinesia, and wearing-off. The follow-up period was 53.40 ± 16.79 months from baseline.
Results
Kaplan–Meier survival curves for H-Y stage 3 and FOG showed more prominent progression to H-Y stage 3 and occurrences of FOG in the depressed PD group than in the nondepressed PD group (log-rank p = 0.025 and 0.003, respectively). Depression in drug-naïve, early-stage PD patients showed a significant association with the progression to H-Y stage 3 (hazard ratio = 2.55; 95% confidence interval = 1.32–4.93; p = 0.005), as analyzed by Cox regression analyses. In contrast, the occurrence of levodopa-induced dyskinesia and wearing-off did not differ between the two groups (log-rank p = 0.903 and 0.351, respectively).
Conclusion
Depression in drug-naïve, early-stage PD patients is associated with an earlier occurrence of postural instability. This suggests shared nondopaminergic pathogenic mechanisms and potentially enables the prediction of early development of postural instability.

Citations

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Association of motor subtype and tremor type with Parkinson's disease progression: An exploratory longitudinal analysis
Yuke Zhong, Huahua Su, Ying Liu, Hang Liu, Guohui Liu, Zhihui Liu, Jiahao Wei, Junyi Wang, Yuchen She, Changhong Tan, Lijuan Mo, Lin Han, Fen Deng, Xi Liu, Lifen Chen
Journal of Parkinson’s Disease.2025; 15(1): 111. CrossRef

Long-Term Outcomes of Deep Brain Stimulation in Pantothenate Kinase-Associated Neurodegeneration-Related Dystonia: Kyung Ah Woo, Han-Joon Kim, Seung-Ho Jeon, Hye Ran Park, Kye Won Park, Seung Hyun Lee, Sun Ju Chung, Jong-Hee Chae, Sun Ha Paek, Beomseok Jeon; J Mov Disord. 2022;15(3):241-248. Published online July 26, 2022; DOI: https://doi.org/10.14802/jmd.22002

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Objective
To investigate the long-term clinical outcomes of pallidal deep brain stimulation (GPi-DBS) in patients with pantothenate kinase-associated neurodegeneration (PKAN).
Methods
We reviewed the records of patients with genetically confirmed PKAN who received bilateral GPi-DBS for refractory dystonia and were clinically followed up for at least 2 years postoperatively at two centers in Korea. Pre- and postoperative Burke– Fahn–Marsden Dystonia Rating Scale motor subscale (BFMDRS-M) scores, disability subscale (BFMDRS-D) scores, and qualitative clinical information were prospectively collected. Descriptive analysis was performed for BFMDRS-M scores, BFMDRSD scores, and the orofacial, axial, and limb subscores of the BFMDRS-M at 6–12, 24–36, and 60–72 months postoperatively.
Results
Five classic-type, four atypical-type, and one unknown-type PKAN cases were identified. The mean preoperative BFMDRS-M score was 92.1 for the classic type and 38.5 for the atypical or unknown type, with a mean BFMDRS follow-up of 50.7 months and a clinical follow-up of 69.0 months. The mean improvements in BFMDRS-M score were 11.3%, 41.3%, and 30.5% at 6–12, 24–36, and 60–72 months, respectively. In four patients with full regular evaluations until 60–72 months, improvements in the orofacial, axial, and limb subscores persisted, but the disability scores worsened from 24–36 months post-operation compared to the baseline, mainly owing to the aggravation of eating and feeding disabilities.
Conclusion
The benefits of GPi-DBS on dystonia may persist for more than 5 years in PKAN. The effects on patients’ subjective disability may have a shorter duration despite improvements in dystonia owing to the complex manifestations of PKAN.

Citations

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Imaging Findings of Intracerebral Infection after Deep Brain Stimulation: Pediatric Case Series and Literature Review
Andrew Z. Yang, Alexandre Boutet, Vivek Pai, Michael J. Colditz, Artur Vetkas, Brendan Santyr, Nardin Samuel, Jurgen Germann, Sara Breitbart, Lior Elkam, Birgit Ertl‐Wagner, Alfonso Fasano, Andres M. Lozano, George M Ibrahim, Carolina Gorodetsky
Movement Disorders Clinical Practice.2025; 12(2): 242. CrossRef
Hallerworden – Spatz DISEASE. Clinical case
L. B. Novikova, K. M. Ziultsle, A. P. Akopian
Medical alphabet.2025; (33): 34. CrossRef
Deep Brain Stimulation for Refractory Status Dystonicus in Children: Multicenter Case Series and Systematic Review
Lindsey M. Vogt, Han Yan, Brendan Santyr, Sara Breitbart, Melanie Anderson, Jürgen Germann, Karlo J. Lizarraga, Angela L. Hewitt, Alfonso Fasano, George M. Ibrahim, Carolina Gorodetsky
Annals of Neurology.2024; 95(1): 156. CrossRef
Illustration of the long-term efficacy of pallidal deep brain stimulation in a patient with PKAN dystonia
Luigi M. Romito, Fabiana Colucci, Giovanna Zorzi, Barbara Garavaglia, Ahmet Kaymak, Alberto Mazzoni, Celeste Panteghini, Nico Golfrè Andreasi, Sara Rinaldo, Vincenzo Levi, Miryam Carecchio, Roberto Eleopra
Parkinsonism & Related Disorders.2024; 123: 106977. CrossRef
Case of Hallervorden–Spatz Syndrome: A Tale of Twin Sisters
Naveen Reddy, Jitender Sharma, Anmol Sharma
Neurology India.2024; 72(2): 411. CrossRef
Patient Selection for Deep Brain Stimulation for Pantothenate Kinase-Associated Neurodegeneration
Jason L. Chan, Ashley E. Rawls, Joshua K. Wong, Penelope Hogarth, Justin D. Hilliard, Michael S. Okun
Tremor and Other Hyperkinetic Movements.2024;[Epub] CrossRef
Surgical treatment of movement disorders in neurometabolic conditions
Alonso Zea Vera, Andrea L. Gropman
Frontiers in Neurology.2023;[Epub] CrossRef

Letter to the editor

An Autopsy-Proven Case of Lewy Body Disease Presenting with Severe Dysphagia: Sungyang Jo, Soo Jeong Nam, Kye Won Park, Jae-Hong Lee, Chong Sik Lee; J Mov Disord. 2021;14(3):242-244. Published online March 15, 2021; DOI: https://doi.org/10.14802/jmd.20039

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Citations

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Porphyrin-Based Conjugated Microporous Polymers for Highly Efficient Adsorption of Metal Ions
Qi-Meige Hasi, Zhi-Chao Han, Yu-Ping Guo, Jia-Le Yu, Chao-Hu Xiao, Yu-Han Zhang, Li-Hua Chen
Langmuir.2022; 38(31): 9507. CrossRef

Original Article

Therapeutic Effect of Levodopa/Carbidopa/Entacapone on Sleep Disturbance in Patients with Parkinson’s Disease: Kye Won Park, Sungyang Jo, Seung Hyun Lee, Yun Su Hwang, Dagyo Lee, Ho-Sung Ryu, Sun Ju Chung; J Mov Disord. 2020;13(3):205-212. Published online September 9, 2020; DOI: https://doi.org/10.14802/jmd.20055

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Abstract PDF

Objective
To investigate the efficacy of levodopa/carbidopa/entacapone (LCE) at bedtime for treating sleep disturbance in patients with Parkinson’s disease (PD) with motor fluctuations.
Methods
Participants included 128 PD patients with motor fluctuations. All patients were assessed for motor, nonmotor, and sleep-specific symptoms using the United Parkinson’s Disease Rating Scale (UPDRS), the Korean version of the Nonmotor Symptom Scale, the Parkinson’s Disease Sleep Scale (PDSS), the Epworth Sleepiness Scale, and the Rapid Eye Movement Sleep Behavior Disorder Screening Questionnaire (RBDSQ). We compared the baseline characteristics of patients with sleep disturbance (PDSS score < 120) and those without sleep disturbance (PDSS score ≥ 120). Thirty-nine patients with sleep disturbance who agreed to take LCE at bedtime completed 3-month follow-ups. We analyzed changes in the scores of motor, nonmotor, and sleep symptom scales over the 3 months.
Results
PD patients with sleep disturbance were at more advanced disease stages and had more severe motor, nonmotor, and sleep symptoms than those without sleep disturbance. Patients who took LCE at night showed improvements in motor (UPDRS part III, p = 0.007) and sleep symptoms (total PDSS, p < 0.001). Sleep features that benefitted from LCE included not only nocturnal motor components but also insomnia (PDSS items 2 and 3, p = 0.005 and p < 0.001) and rapid eye movement behavior disorder (PDSS item 6, p = 0.002; and RBDSQ, p < 0.001).
Conclusion
The use of LCE at bedtime may be a useful treatment for sleep disturbance in advanced PD patients with motor fluctuations.

Citations

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Diagnosis and treatment of autonomic failure, pain and sleep disturbances in Parkinson’s disease: guideline “Parkinson’s disease” of the German Society of Neurology
Alessandra Fanciulli, Friederike Sixel-Döring, Carsten Buhmann, Florian Krismer, Wiebke Hermann, Christian Winkler, Dirk Woitalla, Wolfgang H. Jost, Mathias Bähr, Jos Becktepe, Daniela Berg, Kathrin Brockmann, Andrés Ceballos-Baumann, Joseph Claßen, Corne
Journal of Neurology.2025;[Epub] CrossRef
Comparison of sleep characteristics between Parkinson's disease with and without freezing of gait: A systematic review
Tracy Milane, Clint Hansen, Mathias Baptiste Correno, Matthias Chardon, Fabio A. Barbieri, Edoardo Bianchini, Nicolas Vuillerme
Sleep Medicine.2024; 114: 24. CrossRef
Sleep and sleep disorders in people with Parkinson's disease
Alex Iranzo, Valerie Cochen De Cock, María Livia Fantini, Laura Pérez-Carbonell, Lynn Marie Trotti
The Lancet Neurology.2024; 23(9): 925. CrossRef
Pharmacokinetics and Dose Proportionality Study of a Novel Antiparkinsonian Agent, a 1H-1,2,4-Triazol-3-ylthio-conjugate of Prottremine
Daria S. Gorina, Anastasiya V. Lastovka, Artem D. Rogachev, Alexandra V. Podturkina, Alla V. Pavlova, Oleg V. Ardashov, Nikolai S. Li-Zhulanov, Tatyana G. Tolstikova, Konstantin P. Volcho, Nariman F. Salakhutdinov
Molecules.2024; 29(18): 4498. CrossRef
Opicapone versus entacapone: Head‐to‐head retrospective data‐based comparison of healthcare resource utilization in people with Parkinson's disease new to catechol‐O‐methyltransferase (COMT) inhibitor treatment
Glynn Harrison‐Jones, Xiaocong Li Marston, Francesca Morgante, K. Ray Chaudhuri, Guillermo Castilla‐Fernández, Valentina Di Foggia
European Journal of Neurology.2023; 30(10): 3132. CrossRef
Management of REM sleep behavior disorder: an American Academy of Sleep Medicine systematic review, meta-analysis, and GRADE assessment
Michael Howell, Alon Y. Avidan, Nancy Foldvary-Schaefer, Roneil G. Malkani, Emmanuel H. During, Joshua P. Roland, Stuart J. McCarter, Rochelle S. Zak, Gerard Carandang, Uzma Kazmi, Kannan Ramar
Journal of Clinical Sleep Medicine.2023; 19(4): 769. CrossRef
The real-life effect of catechol-O-methyltransferase inhibition on non-motor symptoms in levodopa-treated Parkinson’s disease: opicapone versus entacapone
Valentina Leta, Daniel J. van Wamelen, Federico Aureli, Vinod Metta, Dhaval Trivedi, Pietro Cortelli, Carmen Rodriguez-Blazquez, Alexandra Rizos, K. Ray Chaudhuri
Journal of Neural Transmission.2023; 130(7): 925. CrossRef
Non-oral continuous drug delivery based therapies and sleep dysfunction in Parkinson’s disease
P. Tall, M. A. Qamar, L. Batzu, V. Leta, C. Falup-Pecurariu, K. Ray Chaudhuri
Journal of Neural Transmission.2023; 130(11): 1443. CrossRef
Tenuigenin promotes non-rapid eye movement sleep via the GABAA receptor and exerts somnogenic effect in a MPTP mouse model of Parkinson's disease
Di Zhang, Wenjing Zhang, Shumin Deng, Lu Liu, Hua Wei, Fenqin Xue, Hui Yang, Xiaomin Wang, Zheng Fan
Biomedicine & Pharmacotherapy.2023; 165: 115259. CrossRef
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Subramanian Thangaleela, Bhagavathi Sundaram Sivamaruthi, Periyanaina Kesika, Subramanian Mariappan, Subramanian Rashmi, Thiwanya Choeisoongnern, Phakkharawat Sittiprapaporn, Chaiyavat Chaiyasut
Brain Sciences.2023; 13(8): 1202. CrossRef
Real‐world considerations regarding the use of the combination of levodopa, carbidopa, and entacapone (Stalevo®) in Parkinson's disease
Heinz Reichmann
European Journal of Neurology.2023; 30(S2): 15. CrossRef
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Karina A. Atanasova-Ivanova, Sonya Ivanova Hristova-Chakmakova, Ivan G. Milanov
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The Home-Based Sleep Laboratory
Yael Hanein, Anat Mirelman, Anat Mirelman, E. Ray Dorsey, Patrik Brundin, Bastiaan R. Bloem
Journal of Parkinson's Disease.2021; 11(s1): S71. CrossRef
Shudi Pingchan Decoction combined with repetitive transcranial magnetic stimulation in the treatment of Parkinson’s disease with sleep disorders
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Letter to the editor

Fragile X-Associated Tremor/Ataxia Syndrome: An Illustrative Case: Chaewon Lee, Kye Won Park, Nari Choi, Ho-Sung Ryu, Sun Ju Chung; J Mov Disord. 2019;12(3):184-186. Published online July 17, 2019; DOI: https://doi.org/10.14802/jmd.18060

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Cureus.2024;[Epub] CrossRef
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A Case of Fragile-X-Associated Tremor/Ataxia Syndrome Without Tremor
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Case Report

Oculodentodigital Dysplasia Presenting as Spastic Paraparesis: The First Genetically Confirmed Korean Case and a Literature Review: Kye Won Park, Ho-Sung Ryu, Juyeon Kim, Sun Ju Chung; J Mov Disord. 2017;10(3):149-153. Published online September 22, 2017; DOI: https://doi.org/10.14802/jmd.17050

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Abstract PDF Supplementary Material

Oculodentodigital dysplasia (ODDD) is a rare autosomal dominant inherited disease caused by mutations of the human gap junction alpha 1 gene, which encodes the protein Connexin-43. Patients with ODDD may present with neurological deficits with a typical pleiotropic combination of characteristic craniofacial, ophthalmological, phalangeal, and dental anomalies. In this report, we describe the first genetically confirmed Korean ODDD patient, who presented with spastic paraparesis. We will also review the neurological aspects of ODDD as reported in the literature.

Citations

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Oculodentodigital Dysplasia Presenting as Spastic Ataxic Syndrome in an Indian Patient
Gosala RK Sarma, Abhinaya Varidireddy, GG Sharath, Sunitha P Kumaran
Annals of Indian Academy of Neurology.2025; 28(1): 112. CrossRef
Glial Connexins and Pannexins in the Healthy and Diseased Brain
Christian Giaume, Christian C. Naus, Juan C. Sáez, Luc Leybaert
Physiological Reviews.2021; 101(1): 93. CrossRef
Oculodentodigital Dysplasia: A Case Report and Major Review of the Eye and Ocular Adnexa Features of 295 Reported Cases
Virang Kumar, Natario L. Couser, Arti Pandya
Case Reports in Ophthalmological Medicine.2020; 2020: 1. CrossRef
Novel ocular findings in oculodentodigital dysplasia (ODDD): a case report and literature review
Zhirong Wang, Limei Sun, Panfeng Wang, Chonglin Chen, Aiyuan Zhang, Weiqing Wang, Xiaoyan Ding
Ophthalmic Genetics.2019; 40(1): 54. CrossRef
Oculodentodigital Dysplasia: A Hypomyelinating Leukodystrophy with a Characteristic MRI Pattern of Brain Stem Involvement
I. Harting, S. Karch, U. Moog, A. Seitz, P.J.W. Pouwels, N.I. Wolf
American Journal of Neuroradiology.2019; 40(5): 903. CrossRef

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