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Nielsen HN, Holm R, Sweazey R, Andersen JP, Artigas P, Vilsen B. Na +,K +-ATPase with Disrupted Na + Binding Sites I and III Binds Na + with Increased Affinity at Site II and Undergoes Na +-Activated Phosphorylation with ATP. Biomolecules 2024; 14:135. [PMID: 38275764 PMCID: PMC10812997 DOI: 10.3390/biom14010135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/08/2024] [Accepted: 01/10/2024] [Indexed: 01/27/2024] Open
Abstract
Na+,K+-ATPase actively extrudes three cytoplasmic Na+ ions in exchange for two extracellular K+ ions for each ATP hydrolyzed. The atomic structure with bound Na+ identifies three Na+ sites, named I, II, and III. It has been proposed that site III is the first to be occupied and site II last, when Na+ binds from the cytoplasmic side. It is usually assumed that the occupation of all three Na+ sites is obligatory for the activation of phosphoryl transfer from ATP. To obtain more insight into the individual roles of the ion-binding sites, we have analyzed a series of seven mutants with substitution of the critical ion-binding residue Ser777, which is a shared ligand between Na+ sites I and III. Surprisingly, mutants with large and bulky substituents expected to prevent or profoundly disturb Na+ access to sites I and III retain the ability to form a phosphoenzyme from ATP, even with increased apparent Na+ affinity. This indicates that Na+ binding solely at site II is sufficient to promote phosphorylation. These mutations appear to lock the membrane sector into an E1-like configuration, allowing Na+ but not K+ to bind at site II, while the cytoplasmic sector undergoes conformational changes uncoupled from the membrane sector.
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Affiliation(s)
- Hang N. Nielsen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
| | - Rikke Holm
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
| | - Ryan Sweazey
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA (P.A.)
| | | | - Pablo Artigas
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA (P.A.)
| | - Bente Vilsen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
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2
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Oishi T, Pagano J, Sellers C, Jerath NU. Two Cases of Periodic Paralysis Associated With MCM3AP Variants. J Clin Neuromuscul Dis 2023; 25:36-41. [PMID: 37611268 DOI: 10.1097/cnd.0000000000000454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Abstract
OBJECTIVES Periodic paralysis is a rare genetic condition characterized by episodes of neuromuscular weakness, often provoked by electrolyte abnormalities, physiologic stress, physical exertion, and diet. In addition to mutations in genes coding for skeletal muscle ion channels, in 2019, Gustavasson et al discovered that the MCM3AP gene could be responsible for periodic paralysis. In this study, we present 2 individuals with clinical episodes of periodic paralysis who have variants in the MCM3AP gene. METHODS Two unrelated probands were independently evaluated with clinical, genetic, and electrodiagnostic testing. RESULTS Proband 1 is a 46-year-old man who presented with decades of ongoing episodic weakness and fatigue, clinically diagnosed with periodic paralysis and supported by electrodiagnostic studies. Proband 2 is a 34-year-old woman with a history of episodic paralysis since childhood. Genetic testing in both individuals revealed potentially pathogenic variants in the MCM3AP gene. CONCLUSIONS Periodic paralysis is a condition that significantly affects the lives of those diagnosed. The results illustrate that MCM3AP gene variants can been associated with a clinical and electrodiagnostic presentation of periodic paralysis. Additional future research should focus on clarifying any relationship between these genetic variants and the disease, as well as other possible genetic causes.
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Affiliation(s)
| | | | - Cody Sellers
- Nova Southeastern University, Fort Lauderdale, FL
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Gosalia H, Karsan N, Goadsby PJ. Genetic Mechanisms of Migraine: Insights from Monogenic Migraine Mutations. Int J Mol Sci 2023; 24:12697. [PMID: 37628876 PMCID: PMC10454024 DOI: 10.3390/ijms241612697] [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: 07/06/2023] [Revised: 08/01/2023] [Accepted: 08/06/2023] [Indexed: 08/27/2023] Open
Abstract
Migraine is a disabling neurological disorder burdening patients globally. Through the increasing development of preclinical and clinical experimental migraine models, advancing appreciation of the extended clinical phenotype, and functional neuroimaging studies, we can further our understanding of the neurobiological basis of this highly disabling condition. Despite increasing understanding of the molecular and chemical architecture of migraine mechanisms, many areas require further investigation. Research over the last three decades has suggested that migraine has a strong genetic basis, based on the positive family history in most patients, and this has steered exploration into possibly implicated genes. In recent times, human genome-wide association studies and rodent genetic migraine models have facilitated our understanding, but most migraine seems polygenic, with the monogenic migraine mutations being considerably rarer, so further large-scale studies are required to elucidate fully the genetic underpinnings of migraine and the translation of these to clinical practice. The monogenic migraine mutations cause severe aura phenotypes, amongst other symptoms, and offer valuable insights into the biology of aura and the relationship between migraine and other conditions, such as vascular disease and sleep disorders. This review will provide an outlook of what is known about some monogenic migraine mutations, including familial hemiplegic migraine, familial advanced sleep-phase syndrome, and cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy.
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Affiliation(s)
- Helin Gosalia
- Headache Group, The Wolfson Sensory, Pain and Rehabilitation Centre, NIHR King’s Clinical Research Facility, & SLaM Biomedical Research Centre, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London SE5 9PJ, UK; (H.G.); (N.K.)
| | - Nazia Karsan
- Headache Group, The Wolfson Sensory, Pain and Rehabilitation Centre, NIHR King’s Clinical Research Facility, & SLaM Biomedical Research Centre, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London SE5 9PJ, UK; (H.G.); (N.K.)
| | - Peter J. Goadsby
- Headache Group, The Wolfson Sensory, Pain and Rehabilitation Centre, NIHR King’s Clinical Research Facility, & SLaM Biomedical Research Centre, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London SE5 9PJ, UK; (H.G.); (N.K.)
- Department of Neurology, University of California, Los Angeles, CA 90095, USA
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4
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Zhang X, Qiu S, Yang L, Li Y, Xu L, Xu N, Mi C, Li M. A novel heterozygous ATP1A2 pathogenic variant in a Chinese child with MELAS-like alternating hemiplegia. Mol Genet Genomic Med 2023; 11:e2146. [PMID: 36749827 PMCID: PMC10178798 DOI: 10.1002/mgg3.2146] [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: 06/19/2022] [Revised: 12/22/2022] [Accepted: 01/25/2023] [Indexed: 02/09/2023] Open
Abstract
BACKGROUND Pathogenic variants of ATP1A2 (OMIM ID: 182340) are usually associated with familial hemiplegic migraine type 2 (FHM-2), alternating hemiplegia of childhood (AHC), early infantile epileptic encephalopathy (EIEE), transient cytotoxic edema, and so on. Here, we present a novel heterozygous ATP1A2 variant in a girl with alternating hemiplegia, febrile seizures, developmental delay (which subsequently subsided), and MELAS-like syndrome (as indicated by brain MRI). The patient did not experience migraine with aura. METHODS The patient was an 8-year-old girl with normal growth and development. Beginning from the age of 3 years and 8 months, the patient experienced several episodes of alternating limb paralysis. The episodes were accompanied by the appearance of MELAS-like findings on brain MRI, which corresponded to the hemiplegia. There were abnormal linear signals in the cerebral cortex on the opposite side of the hemiplegic limb. Each time the patient recovered from hemiplegia, and each time MRI showed no lesions remained after recovery. No obvious abnormality was found in other examinations. Finally, the patient underwent whole-exome sequencing (WES). RESULTS WES revealed a novel and de novo heterozygous variant in the ATP1A2 (NM_000702.3) c.335C>A:p.Ala112Asp (not previously reported). We examined the variant position in the 3D protein structure and found that a missense mutation at this site is a nonconservative substitution. The variation is nonpolymorphic. It occurs at a very low frequency in the population, and its ACMG classification is likely pathogenic. CONCLUSION At present, there are limited reports of mutations in the ATP1A2 gene causing AHC. This is the first case of brain MRI showing MELAS-like imaging in an AHC patient, and more cases are needed for verification. Early genetic testing and family screening can aid in the diagnosis and treatment of genetic diseases. The relationship between ATP1A2 gene mutation genotype and clinical phenotype needs to be further studied.
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Affiliation(s)
- Xin Zhang
- Department of Pediatrics, Linyi People's Hospital, Postgrad Training Base Jinzhou Med University, Linyi, People's Republic of China.,Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Shiyan Qiu
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Li Yang
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Yufen Li
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Liyun Xu
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Na Xu
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Changrui Mi
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
| | - Menglin Li
- Department of Pediatrics, Linyi People's Hospital, Linyi, Shandong, People's Republic of China
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Vivekanandam V, Jayaseelan D, Hanna MG. Muscle channelopathies. HANDBOOK OF CLINICAL NEUROLOGY 2023; 195:521-532. [PMID: 37562884 DOI: 10.1016/b978-0-323-98818-6.00006-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Muscle channelopathies encompass a wide range of mainly episodic conditions that are characterized by muscle stiffness and weakness. The myotonic conditions, characterized predominantly by stiffness, include myotonia congenita, paramyotonia congenita, and sodium channel myotonia. The periodic paralysis conditions include hypokalemic periodic paralysis, hyperkalemic periodic paralysis, and Andersen-Tawil syndrome. Clinical history is key, and diagnosis is confirmed by next-generation genetic sequencing of a panel of known genes but can also be supplemented by neurophysiology studies and MRI. As genetic testing expands, so have the spectrum of phenotypes seen including pediatric presentations and congenital myopathies. Management of these conditions requires a multidisciplinary approach with extra support needed when patients require anesthetics or when pregnant. Patients with Andersen-Tawil syndrome will also need cardiac input. Diagnosis is important as symptomatic treatment is available for all of these conditions but need to be tailored to the gene and variant of the patient.
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Affiliation(s)
- Vinojini Vivekanandam
- Centre for Neuromuscular Disorders, Queen Square UCL Institute of Neurology, London, United Kingdom
| | | | - Michael G Hanna
- Centre for Neuromuscular Disorders, Queen Square UCL Institute of Neurology, London, United Kingdom.
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6
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de Boer I, Harder AVE, Ferrari MD, van den Maagdenberg AMJM, Terwindt GM. Genetics of migraine: Delineation of contemporary understanding of the genetic underpinning of migraine. HANDBOOK OF CLINICAL NEUROLOGY 2023; 198:85-103. [PMID: 38043973 DOI: 10.1016/b978-0-12-823356-6.00012-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Migraine is a disabling episodic brain disorder with an increased familial relative risk, an increased concordance in monozygotic twins, and an estimated heritability of approximately 50%. Various genetic approaches have been applied to identify genetic factors conferring migraine risk. Initially, candidate gene associations studies (CGAS) have been performed that test DNA variants in genes prioritized based on presumed a priori knowledge of migraine pathophysiology. More recently, genome-wide association studies (GWAS) are applied that test genetic variants, single-nucleotide polymorphisms (SNPs), in a hypothesis-free manner. To date, GWAS have identified ~40 genetic loci associated with migraine. New GWAS data, which are expected to come out soon, will reveal over 100 loci. Also, large-scale GWAS, which have appeared for many traits over the last decade, have enabled studying the overlap in genetic architecture between migraine and its comorbid disorders. Importantly, other genetic factors that cannot be identified by a GWAS approach also confer risk for migraine. First steps have been taken to determine the contribution of these mechanisms by investigating mitochondrial DNA and epigenetic mechanisms. In addition to typical epigenetic mechanisms, that is, DNA methylation and histone modifications, also RNA-based mechanisms regulating gene silencing and activation have recently gotten attention. Regardless, until now, most relevant genetic discoveries related to migraine still come from investigating monogenetic syndromes with migraine as a prominent part of the phenotype. Experimental studies on these syndromes have expanded our knowledge on the mechanisms underlying migraine pathophysiology. It can be envisaged that when all (epi)genetic and phenotypic data on the common and rare forms of migraine will be integrated, this will help to unravel the biological mechanisms for migraine, which will likely guide decision-making in clinical practice in the future.
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Affiliation(s)
- Irene de Boer
- Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands
| | - Aster V E Harder
- Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands; Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Michel D Ferrari
- Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands
| | - Arn M J M van den Maagdenberg
- Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands; Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Gisela M Terwindt
- Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands.
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7
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Brunklaus A, Feng T, Brünger T, Perez-Palma E, Heyne H, Matthews E, Semsarian C, Symonds JD, Zuberi SM, Lal D, Schorge S. Gene variant effects across sodium channelopathies predict function and guide precision therapy. Brain 2022; 145:4275-4286. [PMID: 35037686 PMCID: PMC9897196 DOI: 10.1093/brain/awac006] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 11/27/2021] [Accepted: 12/10/2021] [Indexed: 11/14/2022] Open
Abstract
Pathogenic variants in the voltage-gated sodium channel gene family lead to early onset epilepsies, neurodevelopmental disorders, skeletal muscle channelopathies, peripheral neuropathies and cardiac arrhythmias. Disease-associated variants have diverse functional effects ranging from complete loss-of-function to marked gain-of-function. Therapeutic strategy is likely to depend on functional effect. Experimental studies offer important insights into channel function but are resource intensive and only performed in a minority of cases. Given the evolutionarily conserved nature of the sodium channel genes, we investigated whether similarities in biophysical properties between different voltage-gated sodium channels can predict function and inform precision treatment across sodium channelopathies. We performed a systematic literature search identifying functionally assessed variants in any of the nine voltage-gated sodium channel genes until 28 April 2021. We included missense variants that had been electrophysiologically characterized in mammalian cells in whole-cell patch-clamp recordings. We performed an alignment of linear protein sequences of all sodium channel genes and correlated variants by their overall functional effect on biophysical properties. Of 951 identified records, 437 sodium channel-variants met our inclusion criteria and were reviewed for functional properties. Of these, 141 variants were epilepsy-associated (SCN1/2/3/8A), 79 had a neuromuscular phenotype (SCN4/9/10/11A), 149 were associated with a cardiac phenotype (SCN5/10A) and 68 (16%) were considered benign. We detected 38 missense variant pairs with an identical disease-associated variant in a different sodium channel gene. Thirty-five out of 38 of those pairs resulted in similar functional consequences, indicating up to 92% biophysical agreement between corresponding sodium channel variants (odds ratio = 11.3; 95% confidence interval = 2.8 to 66.9; P < 0.001). Pathogenic missense variants were clustered in specific functional domains, whereas population variants were significantly more frequent across non-conserved domains (odds ratio = 18.6; 95% confidence interval = 10.9-34.4; P < 0.001). Pore-loop regions were frequently associated with loss-of-function variants, whereas inactivation sites were associated with gain-of-function (odds ratio = 42.1, 95% confidence interval = 14.5-122.4; P < 0.001), whilst variants occurring in voltage-sensing regions comprised a range of gain- and loss-of-function effects. Our findings suggest that biophysical characterisation of variants in one SCN-gene can predict channel function across different SCN-genes where experimental data are not available. The collected data represent the first gain- versus loss-of-function topological map of SCN proteins indicating shared patterns of biophysical effects aiding variant analysis and guiding precision therapy. We integrated our findings into a free online webtool to facilitate functional sodium channel gene variant interpretation (http://SCN-viewer.broadinstitute.org).
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Affiliation(s)
- Andreas Brunklaus
- Correspondence to: Dr Andreas Brunklaus, MD Fraser of Allander Neurosciences Unit Office Block, Ground Floor, Zone 2 Royal Hospital for Children 1345 Govan Road Glasgow G51 4TF, UK E-mail:
| | | | | | - Eduardo Perez-Palma
- Centro de Genética y Genómica, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile
| | - Henrike Heyne
- Genomic and Personalized Medicine, Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
- Hasso Plattner Institute, Mount Sinai School of Medicine, New York, NY, USA
- Institute for Molecular Medicine Finland: FIMM, Helsinki, Finland
| | - Emma Matthews
- Atkinson Morley Neuromuscular Centre, St George’s University Hospitals NHS Foundation Trust, London, UK
- Molecular and Clinical Sciences Research Institute, St George’s University of London, London, UK
| | - Christopher Semsarian
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, The University of Sydney, Sydney, Australia
- Sydney Medical School Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, Australia
| | - Joseph D Symonds
- The Paediatric Neurosciences Research Group, Royal Hospital for Children, Glasgow, UK
- Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
| | - Sameer M Zuberi
- The Paediatric Neurosciences Research Group, Royal Hospital for Children, Glasgow, UK
- Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
| | - Dennis Lal
- Epilepsy Center, Neurological Institute, Cleveland Clinic, Cleveland, USA
- Stanley Center for Psychiatric Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Stephanie Schorge
- Correspondence may also be addressed to: Professor Stephanie Schorge, PhD Department of Neuroscience Physiology and Pharmacology UCL, London WC1E 6BT, UK E-mail:
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Zhou D, Zhang J, Xiao C, Mo C, Ding BS. Trimethylamine-N-oxide (TMAO) mediates the crosstalk between the gut microbiota and hepatic vascular niche to alleviate liver fibrosis in nonalcoholic steatohepatitis. Front Immunol 2022; 13:964477. [PMID: 36072588 PMCID: PMC9441952 DOI: 10.3389/fimmu.2022.964477] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/04/2022] [Indexed: 11/13/2022] Open
Abstract
Liver fibrosis is one main histological characteristic of nonalcoholic steatohepatitis (NASH), a disease paralleling a worldwide surge in metabolic syndromes with no approved therapies. The role of the gut microbiota in NASH pathogenesis has not been thoroughly illustrated, especially how the gut microbiota derives metabolites to influence the distal liver in NASH. Here, we performed 16S rDNA amplicon sequencing analysis of feces from a mouse NASH model induced by a Western diet and CCl4 injury and found genera under Streptococcaceae, Alcaligenaceae, Oscillibacter, and Pseudochrobactrum, which are related metabolites of TMAO. Injection of the gut microbial metabolite TMAO reduced the progression of liver fibrosis in the mouse NASH model. Further analysis revealed that the anti-fibrotic TMAO normalized gut microbiota diversity and preserved liver sinusoidal endothelial cell integrity by inhibiting endothelial beta 1-subunit of Na (+), K (+)-ATPase (ATP1B1) expression. Collectively, our findings suggest TMAO-mediated crosstalk between microbiota metabolites and hepatic vasculature, and perturbation of this crosstalk disrupts sinusoidal vasculature to promote liver fibrosis in NASH.
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Affiliation(s)
- Dengcheng Zhou
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Jing Zhang
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Chengju Xiao
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Chunheng Mo
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, China
- *Correspondence: Bi-Sen Ding, ; Chunheng Mo,
| | - Bi-Sen Ding
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, China
- Fibrosis Research Program, Division of Pulmonary and Critical Care Medicine, Division of Liver Diseases, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Division of Regenerative Medicine, Weill Cornell Medicine, New York, NY, United States
- *Correspondence: Bi-Sen Ding, ; Chunheng Mo,
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Biondo ED, Spontarelli K, Ababioh G, Méndez L, Artigas P. Diseases caused by mutations in the Na +/K + pump α1 gene ATP1A1. Am J Physiol Cell Physiol 2021; 321:C394-C408. [PMID: 34232746 DOI: 10.1152/ajpcell.00059.2021] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Human cell survival requires function of the Na+/K+ pump; the heteromeric protein that hydrolyzes ATP to extrude Na+ and import K+ across the plasmalemma, thereby building and maintaining these ions' electrochemical gradients. Numerous dominant diseases caused by mutations in genes encoding for Na+/K+ pump catalytic (α) subunit isoforms highlight the importance of this protein. Here, we review literature describing disorders caused by missense mutations in ATP1A1, the gene encoding the ubiquitously expressed α1 isoform of the Na+/K+ pump. These various maladies include primary aldosteronism with secondary hypertension, an endocrine syndrome, Charcot-Marie-Tooth disease, a peripheral neuropathy, complex spastic paraplegia, another neuromuscular disorder, as well as hypomagnesemia accompanied by seizures and cognitive delay, a condition affecting the renal and central nervous systems. This article focuses on observed commonalities among these mutations' functional effects, as well as on the special characteristics that enable each particular mutation to exclusively affect a certain system, without affecting others. In this respect, it is clear how somatic mutations localized to adrenal adenomas increase aldosterone production without compromising other systems. However, it remains largely unknown how and why some but not all de novo germline or familial mutations (where the mutant must be expressed in numerous tissues) produce a specific disease and not the other diseases. We propose hypotheses to explain this observation and the approaches that we think will drive future research on these debilitating disorders to develop novel patient-specific treatments by combining the use of heterologous protein-expression systems, patient-derived pluripotent cells, and gene-edited cell and mouse models.
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Affiliation(s)
- Elisa D Biondo
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Kerri Spontarelli
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Giovanna Ababioh
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Lois Méndez
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Pablo Artigas
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, Texas
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Wang CY, Gao YL, Kong XZ, Liu JX, Zheng CH. Unsupervised Cluster Analysis and Gene Marker Extraction of scRNA-seq Data based on Non-negative Matrix Factorization. IEEE J Biomed Health Inform 2021; 26:458-467. [PMID: 34156956 DOI: 10.1109/jbhi.2021.3091506] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The development of single-cell RNA sequencing (scRNA-seq) technology has made it possible to measure gene expression levels at the resolution of a single cell, which further reveals the complex growth processes of cells such as mutation and differentiation. Recognizing cell heterogeneity is one of the most critical tasks in scRNA-seq research. To solve it, we propose a non-negative matrix factorization framework based on multi-subspace cell similarity learning for unsupervised scRNA-seq data analysis (MscNMF). MscNMF includes three parts: data decomposition, similarity learning, and similarity fusion. The three work together to complete the data similarity learning task. MscNMF can learn the gene features and cell features of different subspaces, and the correlation and heterogeneity between cells will be more prominent in multi-subspaces. The redundant information and noise in each low-dimensional feature space are eliminated, and its gene weight information can be further analyzed to calculate the optimal number of subpopulations. The final cell similarity learning will be more satisfactory due to the fusion of cell similarity information in different subspaces. The advantage of MscNMF is that it can calculate the number of cell types and the rank of Non-negative matrix factorization (NMF) reasonably. Experiments on seven real scRNA-seq datasets show that MscNMF can effectively perform clustering tasks and extract useful genetic markers. To verify its clustering performance, the framework is compared with other latest clustering algorithms and satisfactory results are obtained. The code of MscNMF is free available for academic https://github.com/wangchuanyuan1/project-MscNMF).
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Qian K, Cao S, Liu X. Appeared inexplicable disorders of consciousness after general anesthesia tracheal tube drawing in endoscopic tympanoplasty. IBRAIN 2021; 7:113-118. [PMID: 37786906 PMCID: PMC10528784 DOI: 10.1002/j.2769-2795.2021.tb00073.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/14/2021] [Accepted: 05/24/2021] [Indexed: 10/04/2023]
Abstract
Background Disorders of consciousness (DOC) are neurocognitive disorders related to sharp fluctuations of attention and consciousness, while DOC is characterized by significant interindividual differences, rapid development, and a higher lethal rate. Case information A 53-year-old female patient underwent general anesthesia with tracheal intubation in otoendoscopic tympanoplasty. The patient suddenly appeared moderate DOC after tracheal tube removal with K+ 3.6 (3.5-5.3 mmol/L). Based on the ancillary testing and routine laboratory workup, the possible causes of DOC, such as general anesthesia drugs and cardio cerebral events, were temporarily excluded. DOC was reversed by intravenous administration of KCl 1 g, with K+ 3.78 mmol/L. On one day after surgery, the patient occurred suddenly DOC again after intravenous guttae of 5% glucose 1000 ml, K+ 3.87 mmol/L, possibly because of her recurrent hypokalemic paralysis (HP) of past medical history. The patient's consciousness gradually improved after effective KCl supplementation therapy. Conclusion DOC caused by periodic paralysis (PP) has not been reported, we speculate that hypoactive DOC is closely correlated with normokalemic periodic paralysis (NormoPP) in this case.
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Affiliation(s)
- Kun Qian
- Department of AnesthesiologyThe Affiliated Hospital of Zunyi Medical UniversityZunyiGuizhouChina
| | - Song Cao
- Department of PainThe Affiliated Hospital of Zunyi Medical UniversityZunyiGuizhouChina
| | - Xing‐Kui Liu
- College of Anesthesiology, Zunyi Medical UniversityZunyiGuizhouChina
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12
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Matthews E, Holmes S, Fialho D. Skeletal muscle channelopathies: a guide to diagnosis and management. Pract Neurol 2021; 21:196-204. [PMID: 33563766 DOI: 10.1136/practneurol-2020-002576] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2020] [Indexed: 12/17/2022]
Abstract
Skeletal muscle channelopathies are a group of rare episodic genetic disorders comprising the periodic paralyses and the non-dystrophic myotonias. They may cause significant morbidity, limit vocational opportunities, be socially embarrassing, and sometimes are associated with sudden cardiac death. The diagnosis is often hampered by symptoms that patients may find difficult to describe, a normal examination in the absence of symptoms, and the need to interpret numerous tests that may be normal or abnormal. However, the symptoms respond very well to holistic management and pharmacological treatment, with great benefit to quality of life. Here, we review when to suspect a muscle channelopathy, how to investigate a possible case and the options for therapy once a diagnosis is made.
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Affiliation(s)
- Emma Matthews
- Atkinson-Morley Neuromuscular Centre, St George's University Hospitals NHS Foundation Trust, London, UK
- Department of Neuromuscular Diseases, UCL, Institute of Neurology, London, UK
| | - Sarah Holmes
- Queen Square Centre for Neuromuscular Diseases, National Hospital for Neurology and Neurosurgery, London, UK
| | - Doreen Fialho
- Department of Neuromuscular Diseases, UCL, Institute of Neurology, London, UK
- Queen Square Centre for Neuromuscular Diseases, National Hospital for Neurology and Neurosurgery, London, UK
- Department of Clinical Neurophysiology, King's College Hospital NHS Foundation Trust, London, UK
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13
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Lu S, Cai S, Peng X, Cheng R, Zhang Y. Integrative Transcriptomic, Proteomic and Functional Analysis Reveals ATP1B3 as a Diagnostic and Potential Therapeutic Target in Hepatocellular Carcinoma. Front Immunol 2021; 12:636614. [PMID: 33868261 PMCID: PMC8050352 DOI: 10.3389/fimmu.2021.636614] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 03/12/2021] [Indexed: 12/11/2022] Open
Abstract
The Na+/K+-ATPase (NKA), has been proposed as a signal transducer involving various pathobiological processes, including tumorigenesis. However, the clinical relevance of NKA in hepatocellular carcinoma (HCC) has not been well studied. This study revealed the upregulation of mRNA of ATP1A1, ATP1B1, and ATP1B3 in HCC using TCGA, ICGC, and GEO database. Subsequently, ATP1B3 was demonstrated as an independent prognostic factor of overall survival (OS) of HCC. To investigate the potential mechanisms of ATP1B3 in HCC, we analyzed the co-expression network using LinkedOmics and found that ATP1B3 co-expressed genes were associated with immune-related biological processes. Furthermore, we found that ATP1B3 was correlated immune cell infiltration and immune-related cytokines expression in HCC. The protein level of ATP1B3 was also validated as a prognostic significance and was correlated with immune infiltration in HCC using two proteomics datasets. Finally, functional analysis revealed that ATP1B3 was increased in HCC cells and tissues, silenced ATP1B3 repressed HCC cell proliferation, migration, and promoted HCC cell apoptosis and epithelial to mesenchymal transition (EMT). In conclusion, these findings proved that ATP1B3 could be an oncogene and it was demonstrated as an independent prognostic factor and correlated with immune infiltration in HCC, revealing new insights into the prognostic role and potential immune regulation of ATP1B3 in HCC progression and provide a novel possible therapeutic strategy for HCC.
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Affiliation(s)
- Shanshan Lu
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Research Center of Carcinogenesis and Targeted Therapy, Xiangya Hospital, Central South University, Changsha, China.,The Higher Educational Key Laboratory for Cancer Proteomics and Translational Medicine of Hunan Province, Xiangya Hospital, Central South University, Changsha, China
| | - Shenglan Cai
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Viral Hepatitis, Xiangya Hospital, Central South University, Changsha, China
| | - Xiaozhen Peng
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Huaihua Key Laboratory of Research and Application of Novel Molecular Diagnostic Techniques, School of Public Health & Laboratory Medicine, Hunan University of Medicine, Huaihua, China.,Department of Hunan key laboratary of aging biology, Xiangya Hospital, Central South University, Changsha, China
| | - Ruochan Cheng
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Viral Hepatitis, Xiangya Hospital, Central South University, Changsha, China
| | - Yiya Zhang
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Viral Hepatitis, Xiangya Hospital, Central South University, Changsha, China.,Department of Hunan key laboratary of aging biology, Xiangya Hospital, Central South University, Changsha, China.,Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China
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14
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Decreased content of ascorbic acid (vitamin C) in the brain of knockout mouse models of Na+,K+-ATPase-related neurologic disorders. PLoS One 2021; 16:e0246678. [PMID: 33544780 PMCID: PMC7864419 DOI: 10.1371/journal.pone.0246678] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Accepted: 01/23/2021] [Indexed: 12/21/2022] Open
Abstract
Na+,K+-ATPase is a crucial protein responsible for maintaining the electrochemical gradients across the cell membrane. The Na+,K+-ATPase is comprised of catalytic α, β, and γ subunits. In adult brains, the α3 subunit, encoded by ATP1A3, is predominantly expressed in neurons, whereas the α2 subunit, encoded by ATP1A2, is expressed in glial cells. In foetal brains, the α2 is expressed in neurons as well. Mutations in α subunits cause a variety of neurologic disorders. Notably, the onset of symptoms in ATP1A2- and ATP1A3-related neurologic disorders is usually triggered by physiological or psychological stressors. To gain insight into the distinct roles of the α2 and α3 subunits in the developing foetal brain, whose developmental dysfunction may be a predisposing factor of neurologic disorders, we compared the phenotypes of mouse foetuses with double homozygous knockout of Atp1a2 and Atp1a3 (α2α3-dKO) to those with single knockout. The brain haemorrhage phenotype of α2α3-dKO was similar to that of homozygous knockout of the gene encoding ascorbic acid (ASC or vitamin C) transporter, SVCT2. The α2α3-dKO brain showed significantly decreased level of ASC compared with the wild-type (WT) and single knockout. We found that the ASC content in the basal ganglia and cerebellum was significantly lower in the adult Atp1a3 heterozygous knockout mouse (α3-HT) than in the WT. Interestingly, we observed a significant decrease in the ASC level in the basal ganglia and cerebellum of α3-HT in the peripartum period, during which mice are under physiological stress. These observations indicate that the α2 and α3 subunits independently contribute to the ASC level in the foetal brain and that the α3 subunit contributes to ASC transport in the adult basal ganglia and cerebellum. We propose that decreases in ASC levels may affect neural network development and are linked to the pathophysiology of ATP1A2- and ATP1A3-related neurologic disorders.
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15
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Gu Q, Liu H, Ma J, Yuan J, Li X, Qiao L. A Narrative Review of Circular RNAs in Brain Development and Diseases of Preterm Infants. Front Pediatr 2021; 9:706012. [PMID: 34621711 PMCID: PMC8490812 DOI: 10.3389/fped.2021.706012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 08/23/2021] [Indexed: 02/01/2023] Open
Abstract
Circular RNAs (circRNAs) generated by back-splicing are the vital class of non-coding RNAs (ncRNAs). Circular RNAs are highly abundant and stable in eukaryotes, and many of them are evolutionarily conserved. They are blessed with higher expression in mammalian brains and could take part in the regulation of physiological and pathophysiological processes. In addition, premature birth is important in neurodevelopmental diseases. Brain damage in preterm infants may represent the main cause of long-term neurodevelopmental disorders in surviving babies. Until recently, more and more researches have been evidenced that circRNAs are involved in the pathogenesis of encephalopathy of premature. We aim at explaining neuroinflammation promoting the brain damage. In this review, we summarize the current findings of circRNAs properties, expression, and functions, as well as their significances in the neurodevelopmental impairments, white matter damage (WMD) and hypoxic-ischemic encephalopathy (HIE). So we think that circRNAs have a direct impact on neurodevelopment and brain injury, and will be a powerful tool in the repair of the injured immature brain. Even though their exact roles and mechanisms of gene regulation remain elusive, circRNAs have potential applications as diagnostic biomarkers for brain damage and the target for neuroprotective intervention.
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Affiliation(s)
- Qianying Gu
- School of Medicine, Southeast University, Nanjing, China.,Department of Pediatrics, Zhongda Hospital, Southeast University, Nanjing, China
| | - Heng Liu
- Department of Pediatrics, Zhongda Hospital, Southeast University, Nanjing, China
| | - Jingjing Ma
- School of Medicine, Southeast University, Nanjing, China.,Department of Pediatrics, Zhongda Hospital, Southeast University, Nanjing, China
| | - Jiaming Yuan
- Department of Pediatrics, Tianchang People's Hospital, Anhui, China
| | - Xinger Li
- Department of Biobank, Zhongda Hospital, Southeast University, Nanjing, China
| | - Lixing Qiao
- School of Medicine, Southeast University, Nanjing, China.,Department of Pediatrics, Zhongda Hospital, Southeast University, Nanjing, China
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16
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Pedersen AF, Meyer DN, Petriv AMV, Soto AL, Shields JN, Akemann C, Baker BB, Tsou WL, Zhang Y, Baker TR. Nanoplastics impact the zebrafish (Danio rerio) transcriptome: Associated developmental and neurobehavioral consequences. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115090. [PMID: 32693326 PMCID: PMC7492438 DOI: 10.1016/j.envpol.2020.115090] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 06/05/2020] [Accepted: 06/22/2020] [Indexed: 05/20/2023]
Abstract
Microplastics (MPs) are a ubiquitous pollutant detected not only in marine and freshwater bodies, but also in tap and bottled water worldwide. While MPs have been extensively studied, the toxicity of their smaller counterpart, nanoplastics (NPs), is not well documented. Despite likely large-scale human and animal exposure to NPs, the associated health risks remain unclear, especially during early developmental stages. To address this, we investigated the health impacts of exposures to both 50 and 200 nm polystyrene NPs in larval zebrafish. From 6 to 120 h post-fertilization (hpf), developing zebrafish were exposed to a range of fluorescent NPs (10-10,000 parts per billion). Dose-dependent increases in accumulation were identified in exposed larval fish, potentially coinciding with an altered behavioral response as evidenced through swimming hyperactivity. Notably, exposures did not impact mortality, hatching rate, or deformities; however, transcriptomic analysis suggests neurodegeneration and motor dysfunction at both high and low concentrations. Furthermore, results of this study suggest that NPs can accumulate in the tissues of larval zebrafish, alter their transcriptome, and affect behavior and physiology, potentially decreasing organismal fitness in contaminated ecosystems. The uniquely broad scale of this study during a critical window of development provides crucial multidimensional characterization of NP impacts on human and animal health.
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Affiliation(s)
- Adam F Pedersen
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA
| | - Danielle N Meyer
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA; Department of Pharmacology - School of Medicine, Wayne State University, 540 E Canfield, Detroit, MI, 28201, USA
| | - Anna-Maria V Petriv
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA
| | - Abraham L Soto
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA
| | - Jeremiah N Shields
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA
| | - Camille Akemann
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA; Department of Pharmacology - School of Medicine, Wayne State University, 540 E Canfield, Detroit, MI, 28201, USA
| | - Bridget B Baker
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA
| | - Wei-Ling Tsou
- Department of Pharmacology - School of Medicine, Wayne State University, 540 E Canfield, Detroit, MI, 28201, USA
| | - Yongli Zhang
- College of Engineering, Wayne State University, 5050 Anthony Wayne Dr, Detroit, MI, 28201, USA
| | - Tracie R Baker
- Institute of Environmental Health Sciences, Wayne State University, 6135 Woodward Ave, Detroit, MI, 48202, USA; Department of Pharmacology - School of Medicine, Wayne State University, 540 E Canfield, Detroit, MI, 28201, USA.
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17
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Kubota T, Wu F, Vicart S, Nakaza M, Sternberg D, Watanabe D, Furuta M, Kokunai Y, Abe T, Kokubun N, Fontaine B, Cannon SC, Takahashi MP. Hypokalaemic periodic paralysis with a charge-retaining substitution in the voltage sensor. Brain Commun 2020; 2:fcaa103. [PMID: 33005891 PMCID: PMC7519726 DOI: 10.1093/braincomms/fcaa103] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 05/26/2020] [Accepted: 06/02/2020] [Indexed: 01/06/2023] Open
Abstract
Familial hypokalaemic periodic paralysis is a rare skeletal muscle disease caused by the dysregulation of sarcolemmal excitability. Hypokalaemic periodic paralysis is characterized by repeated episodes of paralytic attacks with hypokalaemia, and several variants in CACNA1S coding for CaV1.1 and SCN4A coding for NaV1.4 have been established as causative mutations. Most of the mutations are substitutions to a non-charged residue, from the positively charged arginine (R) in transmembrane segment 4 (S4) of a voltage sensor in either CaV1.1 or NaV1.4. Mutant channels have aberrant leak currents called 'gating pore currents', and the widely accepted consensus is that this current is the essential pathological mechanism that produces susceptibility to anomalous depolarization and failure of muscle excitability during a paralytic attack. Here, we have identified five hypokalaemic periodic paralysis cases from two different ethnic backgrounds, Japanese and French, with charge-preserving substitutions in S4 from arginine, R, to lysine, K. An R to K substitution has not previously been reported for any other hypokalaemic periodic paralysis families. One case is R219K in NaV1.4, which is located at the first charge in S4 of Domain I. The other four cases all have R897K in CaV1.1, which is located at the first charge in S4 of Domain III. Gating pore currents were not detected in expression studies of CaV1.1-R897K. NaV1.4-R219K mutant channels revealed a distinct, but small, gating pore current. Simulation studies indicated that the small-amplitude gating pore current conducted by NaV1.4-R219K is not likely to be sufficient to be a risk factor for depolarization-induced paralytic attacks. Our rare cases with typical hypokalaemic periodic paralysis phenotypes do not fit the canonical view that the essential defect in hypokalaemic periodic paralysis mutant channels is the gating pore current and raise the possibility that hypokalaemic periodic paralysis pathogenesis might be heterogeneous and diverse.
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Affiliation(s)
- Tomoya Kubota
- Division of Health Sciences, Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7, Yamadaoka, Suita, Osaka, 5650871, Japan.,Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL 60637, USA
| | - Fenfen Wu
- Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Savine Vicart
- Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Maki Nakaza
- Division of Health Sciences, Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7, Yamadaoka, Suita, Osaka, 5650871, Japan
| | - Damien Sternberg
- Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Daisuke Watanabe
- Department of Neurology, National Hospital Organization Hakone Hospital, Odawara, Japan
| | - Mitsuru Furuta
- Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Department of Neurology, Kansai Rosai Hospital, Amagasaki, Hyogo, Japan
| | - Yosuke Kokunai
- Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Tatsuya Abe
- Department of Neurology, National Hospital Organization Hakone Hospital, Odawara, Japan
| | - Norito Kokubun
- Department of Neurology, Dokkyo Medical University, Tochigi, Japan
| | - Bertrand Fontaine
- Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Stephen C Cannon
- Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Masanori P Takahashi
- Division of Health Sciences, Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7, Yamadaoka, Suita, Osaka, 5650871, Japan.,Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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18
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Vivekanandam V, Männikkö R, Matthews E, Hanna MG. Improving genetic diagnostics of skeletal muscle channelopathies. Expert Rev Mol Diagn 2020; 20:725-736. [PMID: 32657178 DOI: 10.1080/14737159.2020.1782195] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Skeletal muscle channelopathies are rare inherited conditions that cause significant morbidity and impact on quality of life. Some subsets have a mortality risk. Improved genetic methodology and understanding of phenotypes have improved diagnostic accuracy and yield. AREAS COVERED We discuss diagnostic advances since the advent of next-generation sequencing and the role of whole exome and genome sequencing. Advances in genotype-phenotype-functional correlations have improved understanding of inheritance and phenotypes. We outline new phenotypes, particularly in the pediatric setting and consider co-existing mutations that may act as genetic modifiers. We also discuss four newly identified genes associated with skeletal muscle channelopathies. EXPERT OPINION Next-generation sequencing using gene panels has improved diagnostic rates, identified new mutations, and discovered patients with co-existing pathogenic mutations ('double trouble'). This field has previously focussed on single genes, but we are now beginning to understand interactions between co-existing mutations, genetic modifiers, and their role in pathomechanisms. New genetic observations in pediatric presentations of channelopathies broadens our understanding of the conditions. Genetic and mechanistic advances have increased the potential to develop treatments.
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Affiliation(s)
- Vinojini Vivekanandam
- Queen Square Centre for Neuromuscular Diseases and Department of Neuromuscular Diseases, Queen Square Institute of Neurology, UCL and National Hospital for Neurology and Neurosurgery , London, UK
| | - Roope Männikkö
- Queen Square Centre for Neuromuscular Diseases and Department of Neuromuscular Diseases, Queen Square Institute of Neurology, UCL and National Hospital for Neurology and Neurosurgery , London, UK
| | - Emma Matthews
- Queen Square Centre for Neuromuscular Diseases and Department of Neuromuscular Diseases, Queen Square Institute of Neurology, UCL and National Hospital for Neurology and Neurosurgery , London, UK
| | - Michael G Hanna
- Queen Square Centre for Neuromuscular Diseases and Department of Neuromuscular Diseases, Queen Square Institute of Neurology, UCL and National Hospital for Neurology and Neurosurgery , London, UK
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19
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Moreno C, Yano S, Bezanilla F, Latorre R, Holmgren M. Transient Electrical Currents Mediated by the Na +/K +-ATPase: A Tour from Basic Biophysics to Human Diseases. Biophys J 2020; 119:236-242. [PMID: 32579966 PMCID: PMC7376075 DOI: 10.1016/j.bpj.2020.06.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 04/06/2020] [Accepted: 06/03/2020] [Indexed: 01/14/2023] Open
Abstract
The Na+/K+-ATPase is a chemical molecular machine responsible for the movement of Na+ and K+ ions across the cell membrane. These ions are moved against their electrochemical gradients, so the protein uses the free energy of ATP hydrolysis to transport them. In fact, the Na+/K+-ATPase is the single largest consumer of energy in most cells. In each pump cycle, the protein sequentially exports 3Na+ out of the cell, then imports 2K+ into the cell at an approximate rate of 200 cycles/s. In each half cycle of the transport process, there is a state in which ions are stably trapped within the permeation pathway of the protein by internal and external gates in their closed states. These gates are required to open alternately; otherwise, passive ion diffusion would be a wasteful end of the cell's energy. Once one of these gates open, ions diffuse from their binding sites to the accessible milieu, which involves moving through part of the electrical field across the membrane. Consequently, ions generate transient electrical currents first discovered more than 30 years ago. They have been studied in a variety of preparations, including native and heterologous expression systems. Here, we review three decades' worth of work using these transient electrical signals to understand the kinetic transitions of the movement of Na+ and K+ ions through the Na+/K+-ATPase and propose the significance that this work might have to the understanding of the dysfunction of human pump orthologs responsible for some newly discovered neurological pathologies.
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Affiliation(s)
- Cristina Moreno
- Molecular Neurophysiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
| | - Sho Yano
- Medical Genetics and Genomic Medicine Training Program, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Francisco Bezanilla
- Department of Biochemistry and Molecular Biology, University of Chicago, Gordon Center for Integrative Sciences, Chicago, Illinois
| | - Ramon Latorre
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Miguel Holmgren
- Molecular Neurophysiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland.
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20
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Chatron N, Cabet S, Alix E, Buenerd A, Cox P, Guibaud L, Labalme A, Marks P, Osio D, Putoux A, Sanlaville D, Lesca G, Vasiljevic A. A novel lethal recognizable polymicrogyric syndrome caused by ATP1A2 homozygous truncating variants. Brain 2020; 142:3367-3374. [PMID: 31608932 DOI: 10.1093/brain/awz272] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 06/20/2019] [Accepted: 07/11/2019] [Indexed: 11/14/2022] Open
Abstract
Polymicrogyria is a heterogeneous malformation of cortical development microscopically defined by an excessive folding of the cortical mantle resulting in small gyri with a fused surface. Polymicrogyria is responsible for a wide range of neurological symptoms (e.g. epilepsy, intellectual disability, motor dysfunction). Most cases have a supposed environmental clastic vascular or infectious origin but progress in genomics has revealed new monogenic entities. We report four cases from two independent families sharing a common recognizable lethal syndromic polymicrogyria of autosomal recessive inheritance. Beyond diffuse polymicrogyria detected prenatally, pathological examination revealed a common pattern associating meningeal arterial calcifications, necrotic and calcified areas in basal ganglia, dentato-olivary dysplasia and severe hypoplasia/agenesis of the pyramidal tracts. In all affected cases, exome sequencing showed a pathogenic homozygous nonsense ATP1A2 variant. This resulted in absence of immunodetectable ATP1A2 protein in two brains analysed. ATP1A2 encodes the alpha-2 isoform of the Na+/K+-ATPase, which is highly expressed in brain tissues and has previously been related to familial hemiplegic migraine (MIM#602481) and alternating hemiplegia of childhood (MIM#104290). Through the description of this genetic entity, we emphasize the possibility of dual mode of transmission for disease-causing genes and provide the key neuropathological features that should prompt geneticists to test for mutations in the ATP1A2 gene.
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Affiliation(s)
- Nicolas Chatron
- Genetics Department, Hospices Civils de Lyon, Lyon, France.,GENDEV Team, CRNL, INSERM U1028, CNRS UMR 5292, UCBL1, Lyon, France
| | - Sara Cabet
- Imagerie pédiatrique et fœtale, UCBL Lyon I, Hôpital Femme Mère Enfant, Lyon-Bron, France
| | - Eudeline Alix
- Genetics Department, Hospices Civils de Lyon, Lyon, France
| | - Annie Buenerd
- Institut de Pathologie Multi-sites des HCL/Centre de Pathologie et Fœtopathologie Est, Lyon, France
| | - Phillip Cox
- Department of Histopathology, Birmingham Women's and Children's Hospital NHSFT, Birmingham, UK
| | - Laurent Guibaud
- Imagerie pédiatrique et fœtale, UCBL Lyon I, Hôpital Femme Mère Enfant, Lyon-Bron, France
| | - Audrey Labalme
- Genetics Department, Hospices Civils de Lyon, Lyon, France
| | - Peter Marks
- West Midlands Regional Genetics Service, Birmingham Women's and Children's Hospital NHSFT, Birmingham, UK
| | - Deborah Osio
- West Midlands Regional Genetics Service, Birmingham Women's and Children's Hospital NHSFT, Birmingham, UK
| | - Audrey Putoux
- Genetics Department, Hospices Civils de Lyon, Lyon, France.,GENDEV Team, CRNL, INSERM U1028, CNRS UMR 5292, UCBL1, Lyon, France
| | - Damien Sanlaville
- Genetics Department, Hospices Civils de Lyon, Lyon, France.,GENDEV Team, CRNL, INSERM U1028, CNRS UMR 5292, UCBL1, Lyon, France
| | - Gaetan Lesca
- Genetics Department, Hospices Civils de Lyon, Lyon, France.,GENDEV Team, CRNL, INSERM U1028, CNRS UMR 5292, UCBL1, Lyon, France
| | - Alexandre Vasiljevic
- Institut de Pathologie Multi-sites des HCL/Centre de Pathologie et Fœtopathologie Est, Lyon, France
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21
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Ciafaloni E, Cohen F, Griggs R. Efficacy and Safety of Dichlorphenamide for Primary Periodic Paralysis in Adolescents Compared With Adults. Pediatr Neurol 2019; 101:43-46. [PMID: 31570296 DOI: 10.1016/j.pediatrneurol.2019.07.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 01/09/2023]
Abstract
BACKGROUND Primary periodic paralyses are rare, hereditary skeletal muscle diseases characterized by episodic muscle weakness. Dichlorphenamide was effective and well tolerated in two studies, including one with adolescents. This analysis describes effects of dichlorphenamide among adolescents and adults. METHODS Patients with primary periodic paralyses in a double-blind, controlled, crossover study were randomized to dichlorphenamide or placebo for nine weeks, with a nine-week or longer between-treatment washout period. Attack rate and severity-weighted attack rate during the final eight weeks of each treatment phase were calculated for adolescents and adults separately. RESULTS Seven adolescents (10 to ≤17 years) and 66 adults were enrolled; five of seven adolescents were evaluable for efficacy and six for safety. Dichlorphenamide total daily dosing among adolescents was 50 mg (n = 1) or 100 mg (n = 5), and in adults was 105.7 mg (mean; n = 61). In adolescents, the median decrease from baseline in frequency of weekly attacks was greater with dichlorphenamide (-0.96) than with placebo (-0.57), similar to findings in adults (dichlorphenamide, -0.83; placebo, -0.24). Severity-weighted attack frequency was likewise reduced more with dichlorphenamide than with placebo in adolescents and adults. The most common adverse event with dichlorphenamide in adolescents was skin rash (two of six [33%]). In adults, numbness was the most common adverse event (26 of 54 [48%]); skin rash occurred less frequently (10 of 54 [19%]). CONCLUSIONS Dichlorphenamide was comparably effective and tolerated among a small number of adolescents as well as adults, although types of adverse events differed between groups.
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Affiliation(s)
- Emma Ciafaloni
- Department of Neurology, University of Rochester, Rochester, New York.
| | - Fredric Cohen
- Department of Global Development and Medical Affairs, Strongbridge Biopharma, Trevose, Pennsylvania
| | - Robert Griggs
- Department of Neurology, University of Rochester, Rochester, New York
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22
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Mármol-Sánchez E, Quintanilla R, Jordana J, Amills M. An association analysis for 14 candidate genes mapping to meat quality quantitative trait loci in a Duroc pig population reveals that the ATP1A2 genotype is highly associated with muscle electric conductivity. Anim Genet 2019; 51:95-100. [PMID: 31633210 DOI: 10.1111/age.12864] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/12/2019] [Indexed: 01/14/2023]
Abstract
In previous GWAS carried out in a Duroc commercial line (Lipgen population), we detected on pig chromosomes 3, 4 and 14 several QTL for gluteus medius muscle redness (GM a*), electric conductivity in the longissimus dorsi muscle (LD CE) and vaccenic acid content in the LD muscle (LD C18:1 n - 7), respectively. We have genotyped, in the Lipgen population, 19 SNPs mapping to 14 genes located within these QTL. Subsequently, association analyses have been performed. After correction for multiple testing, two SNPs in the TGFBRAP1 (rs321173745) and SELENOI (rs330820437) genes were associated with GM a*, whereas ACADSB (rs81449951) and GPR26 (rs343087568) genotypes displayed significant associations with LD vaccenic content. Moreover, the polymorphisms located at the ATP1A2 (rs344748241), ATP8B2 (rs81382410) and CREB3L4 (rs321278469 and rs330133789) genes showed significant associations with LD CE. We made a second round of association analyses including the SNPs mentioned above as well as other SNPs located in the chromosomes to which they map. After performing a correction for multiple testing, the only association that remained significant at the chromosome-wide level was that between the ATP1A2 genotype and LD CE. From a functional point of view, this association is meaningful because this locus encodes a subunit of the Na+ /K+ -ATPase responsible for maintaining an electrochemical gradient across the plasma membrane.
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Affiliation(s)
- E Mármol-Sánchez
- Department of Animal Genetics, Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
| | - R Quintanilla
- Animal Breeding and Genetics Program, Institute for Research and Technology in Food and Agriculture (IRTA), Torre Marimon, Caldes de Montbui, 08140, Spain
| | - J Jordana
- Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
| | - M Amills
- Department of Animal Genetics, Centre for Research in Agricultural Genomics, CSIC-IRTA-UAB-UB, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain.,Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
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23
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Sutherland HG, Albury CL, Griffiths LR. Advances in genetics of migraine. J Headache Pain 2019; 20:72. [PMID: 31226929 PMCID: PMC6734342 DOI: 10.1186/s10194-019-1017-9] [Citation(s) in RCA: 105] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 05/24/2019] [Indexed: 02/06/2023] Open
Abstract
Background Migraine is a complex neurovascular disorder with a strong genetic component. There are rare monogenic forms of migraine, as well as more common polygenic forms; research into the genes involved in both types has provided insights into the many contributing genetic factors. This review summarises advances that have been made in the knowledge and understanding of the genes and genetic variations implicated in migraine etiology. Findings Migraine is characterised into two main types, migraine without aura (MO) and migraine with aura (MA). Hemiplegic migraine is a rare monogenic MA subtype caused by mutations in three main genes - CACNA1A, ATP1A2 and SCN1A - which encode ion channel and transport proteins. Functional studies in cellular and animal models show that, in general, mutations result in impaired glutamatergic neurotransmission and cortical hyperexcitability, which make the brain more susceptible to cortical spreading depression, a phenomenon thought to coincide with aura symptoms. Variants in other genes encoding ion channels and solute carriers, or with roles in regulating neurotransmitters at neuronal synapses, or in vascular function, can also cause monogenic migraine, hemiplegic migraine and related disorders with overlapping symptoms. Next-generation sequencing will accelerate the finding of new potentially causal variants and genes, with high-throughput bioinformatics analysis methods and functional analysis pipelines important in prioritising, confirming and understanding the mechanisms of disease-causing variants. With respect to common migraine forms, large genome-wide association studies (GWAS) have greatly expanded our knowledge of the genes involved, emphasizing the role of both neuronal and vascular pathways. Dissecting the genetic architecture of migraine leads to greater understanding of what underpins relationships between subtypes and comorbid disorders, and may have utility in diagnosis or tailoring treatments. Further work is required to identify causal polymorphisms and the mechanism of their effect, and studies of gene expression and epigenetic factors will help bridge the genetics with migraine pathophysiology. Conclusions The complexity of migraine disorders is mirrored by their genetic complexity. A comprehensive knowledge of the genetic factors underpinning migraine will lead to improved understanding of molecular mechanisms and pathogenesis, to enable better diagnosis and treatments for migraine sufferers.
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Affiliation(s)
- Heidi G Sutherland
- Genomics Research Centre, Institute of Health and Biomedical Innovation. School of Biomedical Sciences, Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Cassie L Albury
- Genomics Research Centre, Institute of Health and Biomedical Innovation. School of Biomedical Sciences, Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Lyn R Griffiths
- Genomics Research Centre, Institute of Health and Biomedical Innovation. School of Biomedical Sciences, Queensland University of Technology (QUT), Brisbane, QLD, Australia.
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24
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Meyer DJ, Gatto C, Artigas P. Na/K Pump Mutations Associated with Primary Hyperaldosteronism Cause Loss of Function. Biochemistry 2019; 58:1774-1785. [PMID: 30811176 DOI: 10.1021/acs.biochem.9b00051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Primary hyperaldosteronism (Conn's syndrome), a common cause of secondary hypertension, is frequently produced by unilateral aldosterone-producing adenomas that carry mutations in ion-transporting genes, including ATP1A1, encoding the Na/K pump's α1 subunit. Whether Na/K pump mutant-mediated inward currents are required to depolarize the cell and increase aldosterone production remains unclear, as such currents were observed in four out of five mutants described so far. Here, we use electrophysiology and uptake of the K+ congener 86Rb+, to characterize the effects of eight additional Na/K pump mutations in transmembrane segments TM1 (delM102-L103, delL103-L104, and delM102-I106), TM4 (delI322-I325 and I327S), and TM9 (delF956-E961, delF959-E961, and delE960-L964), expressed in Xenopus oocytes. All deletion mutants induced abnormal inward currents of different amplitudes at physiological voltages, while I327S lacked such currents. A detailed functional characterization revealed that I327S significantly reduces intracellular Na+ affinity without altering affinity for external K+. 86Rb+-uptake experiments show that I327S dramatically impairs function under physiological concentrations of Na+ and K+. Since Na/K pumps in the adrenal cortex may be formed by association of α1 with β3 instead of β1 subunits, we evaluated whether G99R (another mutant without inward currents when associated with β1) would show inward currents when associated with β3. We found that the kinetic characteristics of either mutant or wild-type α1β3 pumps expressed in Xenopus oocytes to be indistinguishable from those of α1β1 pumps. The observed functional consequences of each hyperaldosteronism mutant point to the loss of Na/K pump function as the common feature of all mutants, which is sufficient to induce hyperaldosteronism.
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Affiliation(s)
- Dylan J Meyer
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research , Texas Tech University Health Sciences Center , Lubbock , Texas 79430 , United States
| | - Craig Gatto
- School of Biological Sciences , Illinois State University , Normal , Illinois 61790 , United States
| | - Pablo Artigas
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research , Texas Tech University Health Sciences Center , Lubbock , Texas 79430 , United States
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