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Tan BJW, Pang XL, Png S, Zhou ZD, Tan EK. Genetic Association Studies in Restless Legs Syndrome: Risk Variants & Ethnic Differences. Can J Neurol Sci 2024:1-16. [PMID: 38267254 DOI: 10.1017/cjn.2024.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
BACKGROUND Genetic association studies have not produced consistent results in restless legs syndrome (RLS). OBJECTIVES To conduct a systematic review on genetic association studies in RLS to highlight the common gene variants and ethnic differences. METHODOLOGY We conducted Pubmed, Embase, and Cochrane search using terms "Genetic association studies" and "restless legs syndrome" for candidate gene-based studies. Out of the initial 43 studies, 18 case control studies (from 2012 to 2022) were included. Thirteen studies including 10794 Caucasian subjects (4984 RLS cases and 5810 controls) and five studies involving 2009 Asian subjects (796 RLS cases and 1213 controls) were tabulated and analyzed. In addition, three Genome-Wide Association Studies (GWAS) in Asians and Europeans/Caucasians were included for comparisons. RESULTS In the Asian population, gene variants in BST1, SNCA Rep1, IL1B, BTBD9, and MAP2K5/SKOR1 increased the risk of RLS (odds ratio range 1.2-2.8). In Caucasian populations, examples of variants that were associated with an increased risk of RLS (odds ratio range 1.1-1.9) include those in GABRR3 TOX3, ADH1B, HMOX1, GLO1, DCDC2C, BTBD9, SKOR1, and SETBP1. Based on the meta-analysis of GWAS studies, the rs9390170 variant in UTRN gene was identified to be a novel genetic marker for RLS in Asian cohorts, whereas rs113851554 in MEIS1 gene was a strong genetic factor among the >20 identified gene variants for RLS in Caucasian populations. CONCLUSION Our systemic review demonstrates that multiple genetic variants modulate risk of RLS in Caucasians (such as MEIS1 BTBD9, MAP2K5) and in Asians (such as BTBD9, MAP2K5, and UTRN).
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Affiliation(s)
- Brendan Jen-Wei Tan
- Department of Neurology, National Neuroscience Institute, Singapore, Singapore
| | - Xin-Ler Pang
- Department of Neurology, National Neuroscience Institute, Singapore, Singapore
| | - Sarah Png
- Department of Neurology, National Neuroscience Institute, Singapore, Singapore
| | - Zhi Dong Zhou
- Department of Neurology, National Neuroscience Institute, Singapore, Singapore
- The Neuroscience and Behavioural Disorders Programme, Duke-NUS Medical School, Singapore, Singapore
| | - Eng-King Tan
- Department of Neurology, National Neuroscience Institute, Singapore, Singapore
- The Neuroscience and Behavioural Disorders Programme, Duke-NUS Medical School, Singapore, Singapore
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Jiménez-Jiménez FJ, Gómez-Tabales J, Alonso-Navarro H, Rodríguez C, Turpín-Fenoll L, Millán-Pascual J, Álvarez I, Pastor P, Calleja M, García-Ruiz R, Navarro-Muñoz S, Recio-Bermejo M, Plaza-Nieto JF, García-Albea E, García-Martín E, Agúndez JAG. LAG3/CD4 Genes Variants and the Risk for Restless Legs Syndrome. Int J Mol Sci 2022; 23:ijms232314795. [PMID: 36499121 PMCID: PMC9739762 DOI: 10.3390/ijms232314795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/08/2022] [Accepted: 11/23/2022] [Indexed: 12/02/2022] Open
Abstract
According to several studies, inflammatory factors could be related to the pathogenesis of idiopathic restless legs syndrome (RLS). In addition, RLS and Parkinson's disease (PD) have shown a possible relationship, and recent studies have shown an association between CD4 rs1922452 and CD4 rs951818 single nucleotide variants (SNVs) and the risk for PD. For these reasons, we investigated the possible association between common variants in the LAG3/CD4 genes (which encoded proteins involved in inflammatory and autoimmune responses) and the risk for RLS in a Caucasian Spanish population. We assessed the frequencies of CD4 rs1922452, CD4 rs951818, and LAG3 rs870849 genotypes and allelic variants in 285 patients with idiopathic RLS and 350 healthy controls using a specific TaqMan-based qPCR assay. We also analyzed the possible influence of the genotypes' frequencies on several variables, including age at onset of RLS, gender, family history of RLS, and response to drugs commonly used in the treatment of RLS. We found a lack of association between the frequencies of genotypes and allelic variants of the 3 SNVs studied and the risk of RLS, and a weak though significant association between the CD4 rs1922452 GG genotype and an older age at onset of RLS. With the exception of this association, our findings suggest that common SNVs in the CD4/LAG3 genes are not associated with the risk of developing idiopathic RLS in Caucasian Spanish people.
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Affiliation(s)
- Félix Javier Jiménez-Jiménez
- Section of Neurology, Hospital Universitario del Sureste, E28500 Arganda del Rey, Spain
- Correspondence: or ; Tel.: +34-636-968-395
| | - Javier Gómez-Tabales
- ARADyAL Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, Universidad de Extremadura, E10003 Cáceres, Spain
| | | | - Christopher Rodríguez
- ARADyAL Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, Universidad de Extremadura, E10003 Cáceres, Spain
| | - Laura Turpín-Fenoll
- Section of Neurology, Hospital La Mancha-Centro, E13600 Alcázar de San Juan, Spain
| | - Jorge Millán-Pascual
- Section of Neurology, Hospital La Mancha-Centro, E13600 Alcázar de San Juan, Spain
| | - Ignacio Álvarez
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, E08221 Terrassa, Spain
- Movement Disorders Unit, Department of Neurology, Hospital Universitari Mutua de Terrassa, E08221 Terrassa, Spain
| | - Pau Pastor
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, E08221 Terrassa, Spain
- Movement Disorders Unit, Department of Neurology, Hospital Universitari Mutua de Terrassa, E08221 Terrassa, Spain
- Unit of Neurodegenerative Diseases, Department of Neurology, The Germans Trias i Pujol Research Institute (IGTP), University Hospital Germans Trias i Pujol, E08916 Badalona, Spain
| | - Marisol Calleja
- Section of Neurology, Hospital Universitario del Sureste, E28500 Arganda del Rey, Spain
| | - Rafael García-Ruiz
- Section of Neurology, Hospital La Mancha-Centro, E13600 Alcázar de San Juan, Spain
| | | | - Marta Recio-Bermejo
- Section of Neurology, Hospital La Mancha-Centro, E13600 Alcázar de San Juan, Spain
| | | | - Esteban García-Albea
- Department of Medicine-Neurology, Universidad de Alcalá, E28801 Alcalá de Henares, Spain
| | - Elena García-Martín
- ARADyAL Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, Universidad de Extremadura, E10003 Cáceres, Spain
| | - José A. G. Agúndez
- ARADyAL Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, Universidad de Extremadura, E10003 Cáceres, Spain
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Schormair B, Zhao C, Salminen AV, Oexle K, Winkelmann J. Reassessment of candidate gene studies for idiopathic restless legs syndrome in a large genome-wide association study dataset of European ancestry. Sleep 2022; 45:6576194. [PMID: 35486972 PMCID: PMC9366638 DOI: 10.1093/sleep/zsac098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/06/2022] [Indexed: 11/12/2022] Open
Abstract
Abstract
Study Objectives
Several candidate gene studies have been published for idiopathic restless legs syndrome (RLS) in populations of European ancestry, but the reported associations have not been confirmed in independent samples. Our aim was to reassess these findings in a large case–control dataset in order to evaluate their validity.
Methods
We screened PubMed for RLS candidate gene studies. We used the genome-wide association study (GWAS) dataset of the International EU-RLS-GENE Consortium as our replication sample, which provided genome-wide single-variant association data based on at most 17 220 individuals of European ancestry. We performed additional gene-based tests using the software MAGMA and assessed the power of our study using the genpwr R package.
Results
We identified 14 studies conducted in European samples which assessed 45 variants in 27 genes of which 5 variants had been reported as significantly associated. None of these individual variants were replicated in our GWAS-based reassessment (nominal p > 0.05) and gene-based tests for the respective five genes ADH1B, GABRR3, HMOX1, MAOA, and VDR, were also nonsignificant (nominal p > 0.05). Our replication dataset was well powered to detect the reported effects, even when adjusting for effect size overestimation due to winner’s curse. Power estimates were close to 100% for all variants.
Conclusion
In summary, none of the significant single-variant associations from candidate gene studies were confirmed in our GWAS dataset. Therefore, these associations were likely false positive. Our observations emphasize the need for large sample sizes and stringent significance thresholds in future association studies for RLS.
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Affiliation(s)
- Barbara Schormair
- Institute of Neurogenomics, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Neuherberg , Germany
- Institute of Human Genetics, School of Medicine, Technical University of Munich , Munich , Germany
| | - Chen Zhao
- Institute of Neurogenomics, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Neuherberg , Germany
| | - Aaro V Salminen
- Institute of Neurogenomics, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Neuherberg , Germany
| | - Konrad Oexle
- Institute of Neurogenomics, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Neuherberg , Germany
- Institute of Human Genetics, School of Medicine, Technical University of Munich , Munich , Germany
| | - Juliane Winkelmann
- Institute of Neurogenomics, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Neuherberg , Germany
- Institute of Human Genetics, School of Medicine, Technical University of Munich , Munich , Germany
- Chair of Neurogenetics, School of Medicine, Technical University of Munich , Munich , Germany
- Munich Cluster for Systems Neurology (SyNergy) , Munich , Germany
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Weber FC, Danker-Hopfe H, Dogan-Sander E, Frase L, Hansel A, Mauche N, Mikutta C, Nemeth D, Richter K, Schilling C, Sebestova M, Spath MM, Nissen C, Wetter TC. Restless Legs Syndrome Prevalence and Clinical Correlates Among Psychiatric Inpatients: A Multicenter Study. Front Psychiatry 2022; 13:846165. [PMID: 35370821 PMCID: PMC8967168 DOI: 10.3389/fpsyt.2022.846165] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 02/18/2022] [Indexed: 11/13/2022] Open
Abstract
Background There are only limited reports on the prevalence of restless legs syndrome (RLS) in patients with psychiatric disorders. The present study aimed to evaluate the prevalence and clinical correlates in psychiatric inpatients in Germany and Switzerland. Methods This is a multicenter cross-sectional study of psychiatric inpatients with an age above 18 years that were diagnosed and evaluated face-to-face using the International RLS Study Group criteria (IRLSSG) and the International RLS severity scale (IRLS). In addition to sociodemographic and biometric data, sleep quality and mood were assessed using the Pittsburgh Sleep Quality Index (PSQI), the Insomnia Severity Index (ISI), the Epworth Sleepiness Scale (ESS), and the Patient Health Questionnaire (PHQ-9). In addition to univariate statistics used to describe and statistically analyze differences in variables of interest between patients with and without RLS, a logistic model was employed to identify predictors for the occurrence of RLS. Results The prevalence of RLS in a sample of 317 psychiatric inpatients was 16.4%, and 76.9% of these were diagnosed with RLS for the first time. RLS severity was moderate to severe (IRLS ± SD: 20.3 ± 8.4). The prevalences in women (p = 0.0036) and in first-degree relatives with RLS (p = 0.0108) as well as the body mass index (BMI, p = 0.0161) were significantly higher among patients with RLS, while alcohol consumption was significantly lower in the RLS group. With the exception of atypical antipsychotics, treatment with psychotropic drugs was not associated with RLS symptoms. Regarding subjective sleep quality and mood, scores of the PSQI (p = 0.0007), ISI (p = 0.0003), and ESS (p = 0.0005) were higher in patients with RLS, while PHQ-9 scores were not different. A logistic regression analysis identified gender (OR 2.67; 95% CI [1.25; 5.72]), first-degree relatives with RLS (OR 3.29; 95% CI [1.11; 9.73], ESS score (OR 1.09; 95% CI [1.01; 1.17]), and rare alcohol consumption (OR 0.45; 95% CI [0.22; 0.94] as predictors for RLS. Conclusions Clinically significant RLS had a high prevalence in psychiatric patients. RLS was associated with higher BMI, impaired sleep quality, and lower alcohol consumption. A systematic assessment of restless legs symptoms might contribute to improve the treatment of psychiatric patients.
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Affiliation(s)
- Franziska C. Weber
- Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany
| | - Heidi Danker-Hopfe
- Charité-Universitätsmedizin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Competence Center of Sleep Medicine Berlin, Berlin, Germany
| | - Ezgi Dogan-Sander
- Department of Psychiatry and Psychotherapy, University of Leipzig Medical Center, Leipzig, Germany
| | - Lukas Frase
- Department of Psychiatry and Psychotherapy, Medical Center, University of Freiburg – Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Anna Hansel
- Department of Psychiatry and Psychotherapy, Medical Center, University of Freiburg – Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Nicole Mauche
- Department of Psychiatry and Psychotherapy, University Leipzig, Medical Faculty, Leipzig, Germany
| | - Christian Mikutta
- University Hospital of Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Privatklinik Meiringen, Meiringen, Switzerland
| | - Diana Nemeth
- Department of Psychiatry and Psychotherapy, Paracelsus Medical University, Nuremberg, Germany
| | - Kneginja Richter
- Department of Psychiatry and Psychotherapy, Paracelsus Medical University, Nuremberg, Germany
| | - Claudia Schilling
- Central Institute of Mental Health, Department of Psychiatry and Psychotherapy, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | | | - Marian M. Spath
- University Hospital of Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Christoph Nissen
- University Hospital of Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Thomas C. Wetter
- Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany
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Jiménez-Jiménez FJ, Ayuso P, Alonso-Navarro H, Calleja M, Díez-Fairén M, Álvarez I, Pastor P, Plaza-Nieto JF, Navarro-Muñoz S, Turpín-Fenoll L, Millán-Pascual J, Recio-Bermejo M, García-Ruiz R, García-Albea E, Agúndez JAG, García-Martín E. Serum Trace Elements Concentrations in Patients with Restless Legs Syndrome. Antioxidants (Basel) 2022; 11:antiox11020272. [PMID: 35204155 PMCID: PMC8868060 DOI: 10.3390/antiox11020272] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 01/26/2022] [Indexed: 12/04/2022] Open
Abstract
Increased brain and serum zinc levels in patients with idiopathic restless legs syndrome (idiopathic RLS or iRLS) were described when compared with controls, suggesting a possible role of zinc in the pathogenesis of this disease. However, serum magnesium, calcium, manganese, iron, and copper levels of RLS patients were similar to controls, suggesting a specific impairment of zinc-dependent metabolism in RLS. The aim of this study is to assess the serum concentrations of trace elements involved in oxidative stress or causing peripheral nerve toxicity in a large series of patients with iRLS and controls. We determined serum levels of iron, copper, manganese, zinc, magnesium, selenium, calcium, aluminium, lead, cadmium, arsenic and mercury in 100 patients diagnosed with iRLS and in 110 age- and sex-matched controls using Inductively Coupled Plasma Mass Spectrometry. Serum copper, magnesium, selenium, and calcium concentrations were significantly higher in RLS patients than in controls. These differences were observed both in men and women. There were no major correlations between serum trace metal concentrations and age at onset of RLS or RLS severity, nor was there any association with a family history of RLS or drug response. This study shows an association between increased serum concentrations of copper, magnesium, selenium, and calcium with RLS in a Spanish Caucasian population and does not confirm the previously reported increase in serum zinc concentrations in patients suffering from this disease, suggesting that the different accuracy of the analytical methods used could have influenced the inconsistent results found in the literature.
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Affiliation(s)
- Félix Javier Jiménez-Jiménez
- Section of Neurology, Hospital Universitario del Sureste, 28500 Arganda del Rey, Spain; (H.A.-N.); (M.C.); (J.F.P.-N.)
- Correspondence: (F.J.J.-J.); (J.A.G.A.)
| | - Pedro Ayuso
- University Institute of Molecular Pathology Biomarkers, ARADyAL Instituto de Salud Carlos III, Universidad de Extremadura, 10071 Cáceres, Spain; (P.A.); (E.G.-M.)
| | - Hortensia Alonso-Navarro
- Section of Neurology, Hospital Universitario del Sureste, 28500 Arganda del Rey, Spain; (H.A.-N.); (M.C.); (J.F.P.-N.)
| | - Marisol Calleja
- Section of Neurology, Hospital Universitario del Sureste, 28500 Arganda del Rey, Spain; (H.A.-N.); (M.C.); (J.F.P.-N.)
| | - Mónica Díez-Fairén
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, 08221 Terrassa, Spain; (M.D.-F.); (I.Á.); (P.P.)
- Movement Disorders Unit, Department of Neurology, Univeristy Hospital Mutua de Terrassa, 08221 Terrassa, Spain
| | - Ignacio Álvarez
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, 08221 Terrassa, Spain; (M.D.-F.); (I.Á.); (P.P.)
- Movement Disorders Unit, Department of Neurology, Univeristy Hospital Mutua de Terrassa, 08221 Terrassa, Spain
| | - Pau Pastor
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, 08221 Terrassa, Spain; (M.D.-F.); (I.Á.); (P.P.)
- Movement Disorders Unit, Department of Neurology, Univeristy Hospital Mutua de Terrassa, 08221 Terrassa, Spain
| | - José Francisco Plaza-Nieto
- Section of Neurology, Hospital Universitario del Sureste, 28500 Arganda del Rey, Spain; (H.A.-N.); (M.C.); (J.F.P.-N.)
| | - Santiago Navarro-Muñoz
- Section of Neurology, Hospital La Mancha-Centro, 13600 Alcázar de San Juan, Spain; (S.N.-M.); (L.T.-F.); (J.M.-P.); (M.R.-B.); (R.G.-R.)
| | - Laura Turpín-Fenoll
- Section of Neurology, Hospital La Mancha-Centro, 13600 Alcázar de San Juan, Spain; (S.N.-M.); (L.T.-F.); (J.M.-P.); (M.R.-B.); (R.G.-R.)
| | - Jorge Millán-Pascual
- Section of Neurology, Hospital La Mancha-Centro, 13600 Alcázar de San Juan, Spain; (S.N.-M.); (L.T.-F.); (J.M.-P.); (M.R.-B.); (R.G.-R.)
| | - Marta Recio-Bermejo
- Section of Neurology, Hospital La Mancha-Centro, 13600 Alcázar de San Juan, Spain; (S.N.-M.); (L.T.-F.); (J.M.-P.); (M.R.-B.); (R.G.-R.)
| | - Rafael García-Ruiz
- Section of Neurology, Hospital La Mancha-Centro, 13600 Alcázar de San Juan, Spain; (S.N.-M.); (L.T.-F.); (J.M.-P.); (M.R.-B.); (R.G.-R.)
| | - Esteban García-Albea
- Department of Medicine-Neurology, Hospital “Príncipe de Asturias”, Universidad de Alcalá, Alcalá de Henares, 28805 Madrid, Spain;
| | - José A. G. Agúndez
- University Institute of Molecular Pathology Biomarkers, ARADyAL Instituto de Salud Carlos III, Universidad de Extremadura, 10071 Cáceres, Spain; (P.A.); (E.G.-M.)
- Correspondence: (F.J.J.-J.); (J.A.G.A.)
| | - Elena García-Martín
- University Institute of Molecular Pathology Biomarkers, ARADyAL Instituto de Salud Carlos III, Universidad de Extremadura, 10071 Cáceres, Spain; (P.A.); (E.G.-M.)
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Ayuso P, García-Martín E, Cornejo-García JA, Agúndez JAG, Ladero JM. Genetic Variants of Alcohol Metabolizing Enzymes and Alcohol-Related Liver Cirrhosis Risk. J Pers Med 2021; 11:jpm11050409. [PMID: 34068303 PMCID: PMC8153263 DOI: 10.3390/jpm11050409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/30/2021] [Accepted: 05/09/2021] [Indexed: 11/25/2022] Open
Abstract
Alcohol-related liver disease (ARLD) is a major public health issue caused by excessive alcohol consumption. ARLD encompasses a wide range of chronic liver lesions, alcohol-related liver cirrhosis being the most severe and harmful state. Variations in the genes encoding the enzymes, which play an active role in ethanol metabolism, might influence alcohol exposure and hence be considered as risk factors of developing cirrhosis. We conducted a case-control study in which 164 alcohol-related liver cirrhosis patients and 272 healthy controls were genotyped for the following functional single nucleotide variations (SNVs): ADH1B gene, rs1229984, rs1041969, rs6413413, and rs2066702; ADH1C gene, rs35385902, rs283413, rs34195308, rs1693482, and rs35719513; CYP2E1 gene, rs3813867. Furthermore, copy number variations (CNVs) for ADH1A, ADH1B, ADH1C, and CYP2E1 genes were analyzed. A significant protective association with the risk of developing alcohol-related liver cirrhosis was observed between the mutant alleles of SNVs ADH1B rs1229984 (Pc value = 0.037) and ADH1C rs283413 (Pc value = 0.037). We identified CNVs in all genes studied, ADH1A gene deletions being more common in alcohol-related liver cirrhosis patients than in control subjects, although the association lost statistical significance after multivariate analyses. Our findings support that susceptibility to alcohol-related liver cirrhosis is related to variations in alcohol metabolism genes.
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Affiliation(s)
- Pedro Ayuso
- ARADyAL, Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, UEx, 10003 Cáceres, Spain; (E.G.-M.); (J.A.G.A.)
- Correspondence:
| | - Elena García-Martín
- ARADyAL, Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, UEx, 10003 Cáceres, Spain; (E.G.-M.); (J.A.G.A.)
| | - José A. Cornejo-García
- ARADyAL, Instituto de Salud Carlos III Research Laboratory, IBIMA, Regional University Hospital of Málaga, UMA, 29010 Málaga, Spain;
| | - José A. G. Agúndez
- ARADyAL, Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, UEx, 10003 Cáceres, Spain; (E.G.-M.); (J.A.G.A.)
| | - José María Ladero
- Service of Gastroenterology (Liver Unit), Hospital Clínico San Carlos, Universidad Complutense Medical School, 28040 Madrid, Spain;
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7
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Jiménez-Jiménez FJ, Agúndez BG, Gómez-Tabales J, Alonso-Navarro H, Turpín-Fenoll L, Millán-Pascual J, Díez-Fairén M, Álvarez I, Pastor P, Calleja M, García-Ruiz R, Navarro-Muñoz S, Recio-Bermejo M, Plaza-Nieto JF, García-Albea E, García-Martín E, Agúndez JAG. Common Endothelial Nitric Oxide Synthase Single Nucleotide Polymorphisms are not Related With the Risk for Restless Legs Syndrome. Front Pharmacol 2021; 12:618989. [PMID: 33732155 PMCID: PMC7959806 DOI: 10.3389/fphar.2021.618989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/22/2021] [Indexed: 11/13/2022] Open
Abstract
Because nitric oxide and endothelial dysfunction could play a role in the pathogenesis of idiopathic restless legs syndrome (RLS), as was suggested by some preliminary data, we investigated the possible association between the rs2070744 variants in the endothelial nitric oxide synthase (eNOS or NOS3) gene (chromosome 7q36.1) and the risk for RLS in a Caucasian Spanish population. We assessed the frequencies of NOS3 single nucleotide polymorphisms (SNPs) rs2070744, rs1799983, and rs79467411 genotypes and allelic variants in 273 patients with idiopathic RLS and 325 healthy controls using a TaqMan-based qPCR assay. We also analyzed the possible influence of genotype frequency on age at onset of RLS symptoms, gender, family history of RLS, and response to drugs commonly used in the treatment of RLS such as dopaminergic drugs, clonazepam, and GABAergic drugs. The frequencies of genotypes and allelic variants were not associated with the risk for RLS and were not influenced by gender, age, and positive family history of RLS. We identified weak statistical associations of the SNP rs1799983 with the response to dopamine agonists (Pc = 0.018 for the rs1799983 G/T genotype) and of the SNP rs79467411 with the response to clonazepam (Pc = 0.018 for the rs79467411 G allele), although these findings should be cautiously interpreted and require further confirmation. These associations aside, our findings suggest that common NOS3 SNPs are not associated with the risk for idiopathic RLS in Caucasian Spanish people.
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Affiliation(s)
| | - Blanca G Agúndez
- UNEx, ARADyAL, University Institute of Molecular Pathology Biomarkers, Cáceres, Spain
| | - Javier Gómez-Tabales
- UNEx, ARADyAL, University Institute of Molecular Pathology Biomarkers, Cáceres, Spain
| | | | | | | | - Mónica Díez-Fairén
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, Barcelona, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Universitari Mutua de Terrassa, Barcelona, Spain
| | - Ignacio Álvarez
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, Barcelona, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Universitari Mutua de Terrassa, Barcelona, Spain
| | - Pau Pastor
- Fundació per la Recerca Biomèdica i Social Mútua de Terrassa, Barcelona, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Universitari Mutua de Terrassa, Barcelona, Spain
| | - Marisol Calleja
- Section of Neurology, Hospital Universitario del Sureste, Arganda del Rey, Spain
| | - Rafael García-Ruiz
- Section of Neurology, Hospital La Mancha-Centro, Alcázar de San Juan, Spain
| | | | | | | | - Esteban García-Albea
- Department of Medicine-Neurology, Universidad de Alcalá, Alcalá de Henares, Spain
| | - Elena García-Martín
- UNEx, ARADyAL, University Institute of Molecular Pathology Biomarkers, Cáceres, Spain
| | - José A G Agúndez
- UNEx, ARADyAL, University Institute of Molecular Pathology Biomarkers, Cáceres, Spain
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Serum vitamin D, vitamin D receptor and binding protein genes polymorphisms in restless legs syndrome. J Neurol 2020; 268:1461-1472. [PMID: 33219423 DOI: 10.1007/s00415-020-10312-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/28/2020] [Accepted: 11/08/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND/OBJECTIVES Several studies showed lower serum 25-hydroxyvitamin D levels in patients with idiopathic restless legs syndrome (RLS) compared with matched controls, and a single study showed an association between the rs731236 single nucleotide polymorphism (SNP) in the vitamin D receptor (VDR) gene and the risk for RLS. We aimed to study the relationship between the serum 25-hydroxyvitamin D levels and to confirm previous findings related to SNPs in the VDR and the GC vitamin D binding protein (GC) gene, with the risk for RLS in the Spanish Caucasian population. METHODS We genotyped 285 idiopathic RLS patients and 325 age and sex-matched controls for VDRrs2228750, VDRrs7975232, VDRrs739837, VDRrs78783628, GCrs7041 and GCrs4588 SNPs using TaqMan assays, and determined serum 25-hydroxyvitamin D levels in 111 idiopathic RLS patients and 167 controls using an ELISA commercial kit. RESULTS Serum 25-hydroxyvitamin D levels were significantly higher in RLS patients than in controls but were unrelated with the 7 SNPs studied. None of the 7 SNPs analyzed was associated with the risk for idiopathic RLS or with a positive family history of RLS. However, RLS patients carrying the rs7975232CC genotype or the rs7975232C allele, had a higher frequency of response to GABAergic drugs. Associations between the age at onset and the severity of RLS with SNPs were inconsistent. CONCLUSIONS This study shows an association between increased serum concentrations of 25-hydroxyvitamin D and a lack of association between 7 SNPs in the VDR and in the GC genes with RLS in the Spanish Caucasian population.
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Memon MD, Faiz S, Zaveri MP, Perry JC, Schuetz TM, Cancarevic I. Unraveling the Mysteries of Restless Leg Syndrome. Cureus 2020; 12:e10951. [PMID: 33083159 PMCID: PMC7567326 DOI: 10.7759/cureus.10951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Restless leg syndrome (RLS) or Willis-Ekbom disease (WED) is an under-diagnosed, chronic, and progressive primary sensory-motor disorder. It is characterized by an uncontrollable urge to move the legs due to uncomfortable and sometimes painful sensations, with a diurnal variation. RLS can lead to severe sleep disturbances, a usual cause of consultation. The pathophysiology is known partially, and it is believed that there is an association between the different variants of genetic mutations combined with dopaminergic and brain iron dysregulation, which plays an important role. The data used for this study were extracted from the articles found in the PubMed database that discuss different gene variants, pathophysiology, and various methods of treatment. They also highlight the role of iron in the pathogenesis of RLS as it is required for the synthesis of tyrosine hydroxylase, which is the rate-limiting step for dopamine synthesis. This review article provides a clinically useful overview of RLS in terms of pathophysiological findings, its genetic associations, and therapeutic options by using the currently available literature. Because RLS presents with vague symptoms and shares similarities with many other diseases, it might be overlooked by many physicians resulting in underdiagnosis and under-treatment. While these discoveries provide a breakthrough in understanding the details of RLS, further studies are recommended as these studies are limited to animal models and provide a limited representation of the general population.
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Affiliation(s)
- Mohammad D Memon
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Sadaf Faiz
- Research, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Mitul P Zaveri
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Jamal C Perry
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Tayná M Schuetz
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Ivan Cancarevic
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
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Govind P, Pavethynath S, Sawabe M, Arai T, Muramatsu M. Association between rs1229984 in ADH1B and cancer prevalence in a Japanese population. Mol Clin Oncol 2020; 12:503-510. [PMID: 32337031 PMCID: PMC7179391 DOI: 10.3892/mco.2020.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 01/15/2020] [Indexed: 12/24/2022] Open
Abstract
Alcohol consumption is an established risk factor for cancer, but little is known regarding the effect of genetic polymorphisms in alcohol metabolism genes on alcohol-related cancer risk in the Japanese population. Associations between the ADH1B gene (alcohol dehydrogenase 1B), single nucleotide polymorphism (SNP) rs1229984 and cancer have been extensively studied yet evidence is inconsistent. This population-based case-control study primarily aimed to clarify any association between SNP rs1229984 in both overall and specific cancer risk in a Japanese population. The functional non-synonymous SNP rs1229984 (Arg48His) was genotyped using DNA samples from 1,359 consecutive autopsy cases registered in The Japanese Single Nucleotide Polymorphisms for Geriatric Research database. Medical and pathological record data from this database were used to categorise cases and controls. Results included 1,359 participants, 816 cases and 543 controls. Multinomial logistic regression analyses showed no significant association between rs1229984 presence and overall cancer risk in both dominant and recessive genetic inheritance models [Arg/Arg+Arg/His vs. His/His: Adjusted odds ratio (OR)=0.66 (95% CI=0.39-1.13; P=0.129), Arg/Arg vs. Arg/His+His/His: OR=0.95 (95% CI=0.75-1.20; P=0.657)]. However, results showed those homozygous for rs1229984 (genotype His/His) were at significantly decreased odds of lung cancer than other genotypes [recessive model: OR=0.64 (95% CI=0.44-0.93; P=0.020]. In conclusion, there was no significant association between rs1229984 and odds of overall or specific cancers except in lung cancer where His/His genotype decreased odds. To the best of our knowledge, the association between His/His and decreased odds of lung cancer is a novel finding. These findings require further validation in larger studies.
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Affiliation(s)
- Pallavi Govind
- Faculty of Medicine, Imperial College London, London SW7 2AZ, UK
| | - Shilpa Pavethynath
- Department of Molecular Epidemiology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Motoji Sawabe
- Department of Molecular Pathology, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Tomio Arai
- Department of Pathology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo 173-0015, Japan
| | - Masaaki Muramatsu
- Department of Molecular Epidemiology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
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Chen J, Huang P, He Y, Shen J, Du J, Cui S, Chen S, Ma J. IL1B polymorphism is associated with essential tremor in Chinese population. BMC Neurol 2019; 19:99. [PMID: 31092216 PMCID: PMC6518722 DOI: 10.1186/s12883-019-1331-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 05/08/2019] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND The aim of the study was to investigate the genetic risk factors of essential tremor (ET) in Chinese Population. METHODS A total of 225 ET patients (25 ET patients also had restless legs syndrome (RLS) and were excluded from final analysis) and 229 controls were recruited. The diagnosis of ET was based on the Consensus Statement of the Movement Disorders Society on tremor. Polymerase chain reaction (PCR) and sequencing were used to detect 12 single nucleotide polymorphisms (SNPs) in seven candidate genes for RLS (HMOX1, HMOX2, VDR, IL17A, IL1B, NOS1 and ADH1B). RESULTS We found that one SNP was associated with the risk of ET in Chinese population after adjusting for age and gender: rs1143633 of IL1B (odds ratio [OR] =2.57, p = 0.003, recessive model), and the statistical result remained significant after Bonferroni correction. Then, we performed a query in Genotype-tissue Expression (GTEx), Brain eQTL Almanac (Braineac) databases and Blood expression quantitative trait loci (eQTL) browser. The significant association was only found between genotype at rs1143633 and IL1B expression level of putamen and white matter in Braineac database, which was more prominent with homozygous (GG) carriers. CONCLUSIONS Our study firstly reported the association of IL1B polymorphism with the risk of ET in Chinese population. However, the association might only suggest a marker of IL1B SNP associated with ET instead of the casual variant. Further studies are needed to confirm our finding.
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Affiliation(s)
- Jie Chen
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Pei Huang
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Yachao He
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Junyi Shen
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Juanjuan Du
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Shishuang Cui
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Shengdi Chen
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China.
| | - Jianfang Ma
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China.
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Association between the missense alcohol dehydrogenase rs1229984T variant with the risk for Parkinson's disease in women. J Neurol 2018; 266:346-352. [PMID: 30483881 DOI: 10.1007/s00415-018-9136-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 11/19/2018] [Accepted: 11/20/2018] [Indexed: 12/30/2022]
Abstract
BACKGROUND/OBJECTIVE Several meta-analyses including retrospective case-control studies have shown that the risk of developing Parkinson's disease (PD) correlates inversely with alcohol consumption and (PD), although the results of prospective longitudinal studies are far from being conclusive. The reasons for this inverse association are not well-known. Because alcohol dehydrogenase is one of the most important alcohol-detoxification enzymes, we tried to replicate a putative association of the risk of developing PD with two missense gene variations affecting the alcohol dehydrogenase 1B (ADH1B) gene (one of them related with aversive effects to alcohol). METHODS In a cohort composed of 629 PD patients and 865 age- and gender-matched healthy individuals, we analyzed genotypes and allele frequencies for two common missense ADH1B single nucleotide polymorphisms (SNPs), namely rs1229984 (His48Arg) and rs6413413 (Thr60Ser) using specifically designed TaqMan assays. RESULTS The frequency of individuals carrying rs1229984T alleles in homozygosity or in heterozygosity was higher in PD than in controls in the whole study cohort (P < 0.001 and P = 0.005, respectively), and in women (P < 0.001 and P < 0.001, respectively). The genotypes for rs6413413 were similar in PD patients and control subjects. Age at onset of PD patients was not statistically related to rs1229984 or rs6413413 genotypes. CONCLUSIONS The missense variant rs1229984T is statistically associated with the risk of developing PD mainly in women, which could explain differences in alcohol consumption in this gender.
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Gamma-aminobutyric acid (GABA) receptors genes polymorphisms and risk for restless legs syndrome. THE PHARMACOGENOMICS JOURNAL 2018; 18:565-577. [DOI: 10.1038/s41397-018-0023-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 02/14/2018] [Accepted: 02/19/2018] [Indexed: 01/08/2023]
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