1
|
Carreño O, Corominas R, Serra SA, Sintas C, Fernández-Castillo N, Vila-Pueyo M, Toma C, Gené GG, Pons R, Llaneza M, Sobrido MJ, Grinberg D, Valverde MÁ, Fernández-Fernández JM, Macaya A, Cormand B. Screening of CACNA1A and ATP1A2 genes in hemiplegic migraine: clinical, genetic, and functional studies. Mol Genet Genomic Med 2013; 1:206-22. [PMID: 24498617 PMCID: PMC3865589 DOI: 10.1002/mgg3.24] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 05/24/2013] [Accepted: 05/24/2013] [Indexed: 12/14/2022] Open
Abstract
Hemiplegic migraine (HM) is a rare and severe subtype of autosomal dominant migraine, characterized by a complex aura including some degree of motor weakness. Mutations in four genes (CACNA1A, ATP1A2, SCN1A and PRRT2) have been detected in familial and in sporadic cases. This genetically and clinically heterogeneous disorder is often accompanied by permanent ataxia, epileptic seizures, mental retardation, and chronic progressive cerebellar atrophy. Here we report a mutation screening in the CACNA1A and ATP1A2 genes in 18 patients with HM. Furthermore, intragenic copy number variant (CNV) analysis was performed in CACNA1A using quantitative approaches. We identified four previously described missense CACNA1A mutations (p.Ser218Leu, p.Thr501Met, p.Arg583Gln, and p.Thr666Met) and two missense changes in the ATP1A2 gene, the previously described p.Ala606Thr and the novel variant p.Glu825Lys. No structural variants were found. This genetic screening allowed the identification of more than 30% of the disease alleles, all present in a heterozygous state. Functional consequences of the CACNA1A-p.Thr501Met mutation, previously described only in association with episodic ataxia, and ATP1A2-p.Glu825Lys, were investigated by means of electrophysiological studies, cell viability assays or Western blot analysis. Our data suggest that both these variants are disease-causing.
Collapse
Affiliation(s)
- Oriel Carreño
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Institut de Biomedicina de la Universitat de Barcelona (IBUB) Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain
| | - Roser Corominas
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain ; Pediatric Neurology Research Group, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona Barcelona, Spain
| | - Selma Angèlica Serra
- Laboratory of Molecular Physiology and Channelopathies, Department of Experimental and Health Sciences, Universitat Pompeu Fabra Barcelona, Spain
| | - Cèlia Sintas
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Institut de Biomedicina de la Universitat de Barcelona (IBUB) Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain
| | - Noèlia Fernández-Castillo
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Institut de Biomedicina de la Universitat de Barcelona (IBUB) Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain
| | - Marta Vila-Pueyo
- Pediatric Neurology Research Group, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona Barcelona, Spain
| | - Claudio Toma
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Institut de Biomedicina de la Universitat de Barcelona (IBUB) Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain
| | - Gemma G Gené
- Laboratory of Molecular Physiology and Channelopathies, Department of Experimental and Health Sciences, Universitat Pompeu Fabra Barcelona, Spain
| | - Roser Pons
- First Department of Pediatrics, Agia Sofia Hospital, University of Athens Athens, Greece
| | - Miguel Llaneza
- Sección de Neurología, Complejo Hospitalario Arquitecto Marcide-Novoa Santos Ferrol, Spain
| | - María-Jesús Sobrido
- Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain ; Fundación Pública Galega de Medicina Xenómica Santiago de Compostela, Spain
| | - Daniel Grinberg
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Institut de Biomedicina de la Universitat de Barcelona (IBUB) Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain
| | - Miguel Ángel Valverde
- Laboratory of Molecular Physiology and Channelopathies, Department of Experimental and Health Sciences, Universitat Pompeu Fabra Barcelona, Spain
| | - José Manuel Fernández-Fernández
- Laboratory of Molecular Physiology and Channelopathies, Department of Experimental and Health Sciences, Universitat Pompeu Fabra Barcelona, Spain
| | - Alfons Macaya
- Pediatric Neurology Research Group, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona Barcelona, Spain
| | - Bru Cormand
- Departament de Genètica, Facultat de Biologia, Universitat de Barcelona Barcelona, Spain ; Institut de Biomedicina de la Universitat de Barcelona (IBUB) Barcelona, Spain ; Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III Spain
| |
Collapse
|
2
|
Kolb AR, Buck TM, Brodsky JL. Saccharomyces cerivisiae as a model system for kidney disease: what can yeast tell us about renal function? Am J Physiol Renal Physiol 2011; 301:F1-11. [PMID: 21490136 PMCID: PMC3129885 DOI: 10.1152/ajprenal.00141.2011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Accepted: 04/11/2011] [Indexed: 01/18/2023] Open
Abstract
Ion channels, solute transporters, aquaporins, and factors required for signal transduction are vital for kidney function. Because mutations in these proteins or in associated regulatory factors can lead to disease, an investigation into their biogenesis, activities, and interplay with other proteins is essential. To this end, the yeast, Saccharomyces cerevisiae, represents a powerful experimental system. Proteins expressed in yeast include the following: 1) ion channels, including the epithelial sodium channel, members of the inward rectifying potassium channel family, and cystic fibrosis transmembrane conductance regulator; 2) plasma membrane transporters, such as the Na(+)-K(+)-ATPase, the Na(+)-phosphate cotransporter, and the Na(+)-H(+) ATPase; 3) aquaporins 1-4; and 4) proteins such as serum/glucocorticoid-induced kinase 1, phosphoinositide-dependent kinase 1, Rh glycoprotein kidney, and trehalase. The variety of proteins expressed and studied emphasizes the versatility of yeast, and, because of the many available tools in this organism, results can be obtained rapidly and economically. In most cases, data gathered using yeast have been substantiated in higher cell types. These attributes validate yeast as a model system to explore renal physiology and suggest that research initiated using this system may lead to novel therapeutics.
Collapse
Affiliation(s)
- Alexander R Kolb
- University of Pittsburgh, 4249 Fifth Ave., A320 Langley Hall, Pittsburgh, PA 15260, USA
| | | | | |
Collapse
|
3
|
Lenoir G, Picard M, Møller JV, le Maire M, Champeil P, Falson P. Involvement of the L6-7 loop in SERCA1a Ca2+-ATPase activation by Ca2+ (or Sr2+) and ATP. J Biol Chem 2004; 279:32125-33. [PMID: 15155750 DOI: 10.1074/jbc.m402934200] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Wild-type (WT) and the double mutant D813A,D818A (ADA) of the L6-7 loop of SERCA1a were expressed in yeast, purified, and reconstituted into lipids. This allowed us to functionally study these ATPases by both kinetic and spectroscopic means, and to solve previous discrepancies in the published literature about both experimental facts and interpretation concerning the role of this loop in P-type ATPases. We show that in a solubilized state, the ADA mutant experiences a dramatic decrease of its calcium-dependent ATPase activity. On the contrary, reconstituted in a lipid environment, it displays an almost unaltered maximal calcium-dependent ATPase activity at high (millimolar) ATP, with an apparent affinity for Ca(2+) altered only moderately (3-fold). In the absence of ATP, the true affinity of ADA for Ca(2+) is, however, more significantly reduced (20-30-fold) compared with WT, as judged from intrinsic (Trp) or extrinsic (fluorescence isothiocyanate) fluorescence experiments. At low ATP, transient kinetics experiments reveal an overshoot in the ADA phosphorylation level primarily arising from the slowing down of the transition between the nonphosphorylated "E2" and "Ca(2)E1" forms of ADA. At high ATP, this slowing down is only partially compensated for, as ADA turnover remains more sensitive to orthovanadate than WT turnover. ADA ATPase also proved to have a reduced affinity for ATP in studies performed under equilibrium conditions in the absence of Ca(2+), highlighting the long range interactions between L6-7 and the nucleotide-binding site. We propose that these mutations in L6-7 could affect protonation-dependent winding and unwinding events in the nearby M6 transmembrane segment.
Collapse
Affiliation(s)
- Guillaume Lenoir
- Unité de Recherche Associée 2096, the Centre National de la Recherche Scientifique and Section de Biophysique des Fonctions Membranaires, Département de Biologie Joliot Curie, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | | | | | | | | | | |
Collapse
|