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Sebastian S, Nobles M, Tsisanova E, Ludwig A, Munroe PB, Tinker A. The role of resistance to inhibitors of cholinesterase 8b in the control of heart rate. Physiol Genomics 2021; 53:150-159. [PMID: 33719582 DOI: 10.1152/physiolgenomics.00157.2020] [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: 11/22/2022] Open
Abstract
We have assessed the role of ric-b8 in the control of heart rate after the gene was implicated in a recent genome-wide association study of resting heart rate. We developed a novel murine model in which it was possible to conditionally delete ric-8b in the sinoatrial (SA) node after the addition of tamoxifen. Despite this, we were unable to obtain homozygotes and thus studied heterozygotes. Haploinsufficiency of ric-8b in the sinoatrial node induced by the addition of tamoxifen in adult animals leads to mice with a reduced heart rate. However, other electrocardiographic intervals (e.g., PR and QRS) were normal, and there was no apparent arrhythmia such as heart block. The positive chronotropic response to isoprenaline was abrogated, whereas the response to carbachol was unchanged. The pacemaker current If (funny current) has an important role in regulating heart rate, and its function is modulated by both isoprenaline and carbachol. Using a heterologous system expressing HCN4, we show that ric-8b can modulate the HCN4 current. Overexpression of ric-8b led to larger HCN4 currents, whereas silencing ric-8b led to smaller currents. Ric-8b modulates heart rate responses in vivo likely via its actions on the stimulatory G-protein.
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Affiliation(s)
- Sonia Sebastian
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Muriel Nobles
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Elena Tsisanova
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Andreas Ludwig
- Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Patricia B Munroe
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Andrew Tinker
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
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2
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Claus EB, Cornish AJ, Broderick P, Schildkraut JM, Dobbins SE, Holroyd A, Calvocoressi L, Lu L, Hansen HM, Smirnov I, Walsh KM, Schramm J, Hoffmann P, Nöthen MM, Jöckel KH, Swerdlow A, Larsen SB, Johansen C, Simon M, Bondy M, Wrensch M, Houlston RS, Wiemels JL. Genome-wide association analysis identifies a meningioma risk locus at 11p15.5. Neuro Oncol 2019; 20:1485-1493. [PMID: 29762745 PMCID: PMC6176799 DOI: 10.1093/neuonc/noy077] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Background Meningiomas are adult brain tumors originating in the meningeal coverings of the brain and spinal cord, with significant heritable basis. Genome-wide association studies (GWAS) have previously identified only a single risk locus for meningioma, at 10p12.31. Methods To identify a susceptibility locus for meningioma, we conducted a meta-analysis of 2 GWAS, imputed using a merged reference panel from the 1000 Genomes Project and UK10K data, with validation in 2 independent sample series totaling 2138 cases and 12081 controls. Results We identified a new susceptibility locus for meningioma at 11p15.5 (rs2686876, odds ratio = 1.44, P = 9.86 × 10–9). A number of genes localize to the region of linkage disequilibrium encompassing rs2686876, including RIC8A, which plays a central role in the development of neural crest-derived structures, such as the meninges. Conclusions This finding advances our understanding of the genetic basis of meningioma development and provides additional support for a polygenic model of meningioma.
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Affiliation(s)
- Elizabeth B Claus
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Department of Neurosurgery, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - Alex J Cornish
- Division of Genetics and Epidemiology, The Institute of Cancer Research, London, UK
| | - Peter Broderick
- Division of Genetics and Epidemiology, The Institute of Cancer Research, London, UK
| | - Joellen M Schildkraut
- Department of Public Health Sciences, University of Virginia, Charlottesville, Virginia, USA
| | - Sara E Dobbins
- Division of Genetics and Epidemiology, The Institute of Cancer Research, London, UK
| | - Amy Holroyd
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Division of Genetics and Epidemiology, The Institute of Cancer Research, London, UK
| | - Lisa Calvocoressi
- School of Public Health, Yale University, New Haven, Connecticut, USA
| | - Lingeng Lu
- School of Public Health, Yale University, New Haven, Connecticut, USA
| | - Helen M Hansen
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Division of Neuroepidemiology, Department of Neurological Surgery, University of California San Francisco, San Francisco, California, USA
| | - Ivan Smirnov
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Division of Neuroepidemiology, Department of Neurological Surgery, University of California San Francisco, San Francisco, California, USA
| | - Kyle M Walsh
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Division of Neuroepidemiology, Department of Neurological Surgery, University of California San Francisco, San Francisco, California, USA
| | - Johannes Schramm
- School of Public Health, Yale University, New Haven, Connecticut, USA.,University of Bonn Medical School, Bonn, Germany
| | - Per Hoffmann
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Human Genomics Research Group, Department of Biomedicine, University of Basel, Basel, Switzerland.,Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany
| | - Markus M Nöthen
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn School of Medicine and University Hospital Bonn, Bonn, Germany
| | - Karl-Heinz Jöckel
- School of Public Health, Yale University, New Haven, Connecticut, USA.,Institute for Medical Informatics, Biometry and Epidemiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Anthony Swerdlow
- Division of Genetics and Epidemiology, The Institute of Cancer Research, London, UK.,Division of Breast Cancer Research, The Institute of Cancer Research, London, UK
| | - Signe Benzon Larsen
- Unit of Survivorship, The Danish Cancer Society Research Center, Copenhagen, Denmark
| | - Christoffer Johansen
- Unit of Survivorship, The Danish Cancer Society Research Center, Copenhagen, Denmark
| | - Matthias Simon
- University of Bonn Medical School, Bonn, Germany.,Department of Neurosurgery, Bethel Clinic, Bielefeld, Germany
| | - Melissa Bondy
- Section of Epidemiology and Population Sciences, Department of Medicine and Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Margaret Wrensch
- Division of Neuroepidemiology, Department of Neurological Surgery, University of California San Francisco, San Francisco, California, USA.,Institute for Human Genetics, University of California San Francisco, San Francisco, California, USA
| | - Richard S Houlston
- Division of Genetics and Epidemiology, The Institute of Cancer Research, London, UK
| | - Joseph L Wiemels
- Division of Neuroepidemiology, Department of Neurological Surgery, University of California San Francisco, San Francisco, California, USA.,Institute for Human Genetics, University of California San Francisco, San Francisco, California, USA.,Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA
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3
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Kask K, Tikker L, Ruisu K, Lulla S, Oja EM, Meier R, Raid R, Velling T, Tõnissoo T, Pooga M. Targeted deletion of RIC8A in mouse neural precursor cells interferes with the development of the brain, eyes, and muscles. Dev Neurobiol 2018; 78:374-390. [PMID: 29380551 DOI: 10.1002/dneu.22578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 01/18/2018] [Accepted: 01/18/2018] [Indexed: 11/11/2022]
Abstract
Autosomal recessive disorders such as Fukuyama congenital muscular dystrophy, Walker-Warburg syndrome, and the muscle-eye-brain disease are characterized by defects in the development of patient's brain, eyes, and skeletal muscles. These syndromes are accompanied by brain malformations like type II lissencephaly in the cerebral cortex with characteristic overmigrations of neurons through the breaches of the pial basement membrane. The signaling pathways activated by laminin receptors, dystroglycan and integrins, control the integrity of the basement membrane, and their malfunctioning may underlie the pathologies found in the rise of defects reminiscent of these syndromes. Similar defects in corticogenesis and neuromuscular disorders were found in mice when RIC8A was specifically removed from neural precursor cells. RIC8A regulates a subset of G-protein α subunits and in several model organisms, it has been reported to participate in the control of cell division, signaling, and migration. Here, we studied the role of RIC8A in the development of the brain, muscles, and eyes of the neural precursor-specific conditional Ric8a knockout mice. The absence of RIC8A severely affected the attachment and positioning of radial glial processes, Cajal-Retzius' cells, and the arachnoid trabeculae, and these mice displayed additional defects in the lens, skeletal muscles, and heart development. All the discovered defects might be linked to aberrancies in cell adhesion and migration, suggesting that RIC8A has a crucial role in the regulation of cell-extracellular matrix interactions and that its removal leads to the phenotype characteristic to type II lissencephaly-associated diseases. © 2018 Wiley Periodicals, Inc. Develop Neurobiol 78: 374-390, 2018.
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Affiliation(s)
- Keiu Kask
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Laura Tikker
- Department of Biosciences, University of Helsinki, P.O. Box 56, Viikinkaari 9, FIN-00014, Helsinki, Finland
| | - Katrin Ruisu
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Sirje Lulla
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Eva-Maria Oja
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Riho Meier
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Raivo Raid
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Teet Velling
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Tambet Tõnissoo
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia
| | - Margus Pooga
- Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St, Tartu, 51010, Estonia.,Institute of Technology, University of Tartu, Nooruse 1, Tartu, 50411, Estonia
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Ruisu K, Meier R, Kask K, Tõnissoo T, Velling T, Pooga M. RIC8A is essential for the organisation of actin cytoskeleton and cell-matrix interaction. Exp Cell Res 2017; 357:181-191. [PMID: 28526238 DOI: 10.1016/j.yexcr.2017.05.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 05/09/2017] [Accepted: 05/14/2017] [Indexed: 01/07/2023]
Abstract
RIC8A functions as a chaperone and guanine nucleotide exchange factor for a subset of G protein α subunits. Multiple G protein subunits mediate various signalling events that regulate cell adhesion and migration and the involvement of RIC8A in some of these processes has been demonstrated. We have previously shown that the deficiency of RIC8A causes a failure in mouse gastrulation and neurogenesis - major events in embryogenesis that rely on proper association of cells with the extracellular matrix (ECM) and involve active cell migration. To elaborate on these findings, we used Ric8a-/- mouse embryonic stem cells and Ric8a-deficient mouse embryonic fibroblasts, and found that RIC8A plays an important role in the organisation and remodelling of actin cytoskeleton and cell-ECM association. Ric8a-deficient cells were able to attach to different ECM components, but were unable to spread correctly, and did not form stress fibres or focal adhesion complexes. We also found that the presence of RIC8A is necessary for the activation of β1 integrins and integrin-mediated cell migration.
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Affiliation(s)
- Katrin Ruisu
- Department of Developmental Biology, Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St., Tartu 51010, Estonia.
| | - Riho Meier
- Department of Developmental Biology, Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St., Tartu 51010, Estonia; Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
| | - Keiu Kask
- Department of Developmental Biology, Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St., Tartu 51010, Estonia
| | - Tambet Tõnissoo
- Department of Developmental Biology, Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St., Tartu 51010, Estonia; Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
| | - Teet Velling
- Department of Developmental Biology, Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St., Tartu 51010, Estonia; Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
| | - Margus Pooga
- Department of Developmental Biology, Institute of Molecular and Cell Biology, University of Tartu, 23 Riia St., Tartu 51010, Estonia; Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
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