15
|
Guida S, Trettel F, Pagnutti S, Mantuano E, Tottene A, Veneziano L, Fellin T, Spadaro M, Stauderman KA, Williams ME, Volsen S, Ophoff RA, Frants RR, Jodice C, Frontali M, Pietrobon D. Complete loss of P/Q calcium channel activity caused by a CACNA1A missense mutation carried by patients with episodic ataxia type 2. Am J Hum Genet 2001; 68:759-64. [PMID: 11179022 PMCID: PMC1274487 DOI: 10.1086/318804] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2000] [Accepted: 01/08/2001] [Indexed: 11/03/2022] Open
Abstract
Familial hemiplegic migraine, episodic ataxia type 2 (EA2), and spinocerebellar ataxia type 6 are allelic disorders of the CACNA1A gene (coding for the alpha(1A) subunit of P/Q calcium channels), usually associated with different types of mutations (missense, protein truncating, and expansion, respectively). However, the finding of expansion and missense mutations in patients with EA2 has blurred this genotype-phenotype correlation. We report the first functional analysis of a new missense mutation, associated with an EA2 phenotype-that is, T-->C transition of nt 4747 in exon 28, predicted to change a highly conserved phenylalanine residue to a serine at codon 1491, located in the putative transmembrane segment S6 of domain III. Patch-clamp recording in HEK 293 cells, coexpressing the mutagenized human alpha(1A-2) subunit, together with human beta(4) and alpha(2)delta subunits, showed that channel activity was completely abolished, although the mutated protein is expressed in the cell. These results indicate that a complete loss of P/Q channel function is the mechanism underlying EA2, whether due to truncating or to missense mutations.
Collapse
Affiliation(s)
- Serena Guida
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Flavia Trettel
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Stefano Pagnutti
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Elide Mantuano
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Angelita Tottene
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Liana Veneziano
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Tommaso Fellin
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Maria Spadaro
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Kenneth A. Stauderman
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Mark E. Williams
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Stephen Volsen
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Roel A. Ophoff
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Rune R. Frants
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Carla Jodice
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Marina Frontali
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| | - Daniela Pietrobon
- Department of Biology, Tor Vergata University, Institute of Experimental Medicine Consiglio Nazionale delle Ricerche, and Istituto di Clinica delle Malattie Nervose e Mentali, La Sapienza University, Rome; Department of Biomedical Sciences and National Research Council Centre of Biomembranes, University of Padova, Padova, Italy; SIBIA Neurosciences, La Jolla, CA; Lilly Research Center, Eli Lilly Company Limited, Windlesham, United Kingdom; UCLA Center for Neurobehavioral Genetics, Department of Psychiatry and Human Genetics, Los Angeles; and Medical Genetic Center Department of Human and Clinical Genetics, University Medical Center, Leiden, The Netherlands
| |
Collapse
|