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Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity
Mutations affecting the Na(+), K(+) ATPase alpha subunit have been implicated in at least two distinct human diseases, rapid-onset dystonia Parkinsonism (RDP), and familial hemiplegic migraine (FHM). Over 40 mutations have been mapped to the human ATP1A2 and ATP1A3 genes and are known to result in R...
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Formato: | Texto |
Lenguaje: | English |
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Springer-Verlag
2009
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2791699/ https://www.ncbi.nlm.nih.gov/pubmed/19455355 http://dx.doi.org/10.1007/s00439-009-0673-2 |
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author | Ashmore, Lesley J. Hrizo, Stacy L. Paul, Sarah M. Van Voorhies, Wayne A. Beitel, Greg J. Palladino, Michael J. |
author_facet | Ashmore, Lesley J. Hrizo, Stacy L. Paul, Sarah M. Van Voorhies, Wayne A. Beitel, Greg J. Palladino, Michael J. |
author_sort | Ashmore, Lesley J. |
collection | PubMed |
description | Mutations affecting the Na(+), K(+) ATPase alpha subunit have been implicated in at least two distinct human diseases, rapid-onset dystonia Parkinsonism (RDP), and familial hemiplegic migraine (FHM). Over 40 mutations have been mapped to the human ATP1A2 and ATP1A3 genes and are known to result in RDP, FHM or a variant of FHM with neurological complications. To develop a genetically tractable model system for investigating the role of the Na(+), K(+) ATPase in neural pathologies we performed genetic screens in Drosophila melanogaster to isolate loss-of-function alleles affecting the Na(+), K(+) ATPase alpha subunit. Flies heterozygous for these mutations all exhibit reduced respiration, consistent with a loss-of-function in the major ATPase. However, these mutations do not affect all functions of the Na(+), K(+) ATPase alpha protein since embryos homozygous for these mutations have normal septate junction paracellular barrier function and tracheal morphology. Importantly, all of these mutations cause neurological phenotypes and, akin to the mutations that cause RDP and FHM, these new alleles are missense mutations. All of these alleles exhibit progressive stress-induced locomotor impairment suggesting neuromuscular dysfunction, yet neurodegeneration is observed in an allele-specific manner. Surprisingly, studies of longevity demonstrate that mild hypomorphic mutations in the sodium pump significantly improve longevity, which was verified using the Na(+), K(+) ATPase antagonist ouabain. The isolation and characterization of a series of new missense alleles of ATPalpha in Drosophila provides the foundation for further studies of these neurological diseases and the role of sodium pump impairment in animal longevity. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00439-009-0673-2) contains supplementary material, which is available to authorized users. |
format | Text |
id | pubmed-2791699 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | Springer-Verlag |
record_format | MEDLINE/PubMed |
spelling | pubmed-27916992009-12-10 Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity Ashmore, Lesley J. Hrizo, Stacy L. Paul, Sarah M. Van Voorhies, Wayne A. Beitel, Greg J. Palladino, Michael J. Hum Genet Original Investigation Mutations affecting the Na(+), K(+) ATPase alpha subunit have been implicated in at least two distinct human diseases, rapid-onset dystonia Parkinsonism (RDP), and familial hemiplegic migraine (FHM). Over 40 mutations have been mapped to the human ATP1A2 and ATP1A3 genes and are known to result in RDP, FHM or a variant of FHM with neurological complications. To develop a genetically tractable model system for investigating the role of the Na(+), K(+) ATPase in neural pathologies we performed genetic screens in Drosophila melanogaster to isolate loss-of-function alleles affecting the Na(+), K(+) ATPase alpha subunit. Flies heterozygous for these mutations all exhibit reduced respiration, consistent with a loss-of-function in the major ATPase. However, these mutations do not affect all functions of the Na(+), K(+) ATPase alpha protein since embryos homozygous for these mutations have normal septate junction paracellular barrier function and tracheal morphology. Importantly, all of these mutations cause neurological phenotypes and, akin to the mutations that cause RDP and FHM, these new alleles are missense mutations. All of these alleles exhibit progressive stress-induced locomotor impairment suggesting neuromuscular dysfunction, yet neurodegeneration is observed in an allele-specific manner. Surprisingly, studies of longevity demonstrate that mild hypomorphic mutations in the sodium pump significantly improve longevity, which was verified using the Na(+), K(+) ATPase antagonist ouabain. The isolation and characterization of a series of new missense alleles of ATPalpha in Drosophila provides the foundation for further studies of these neurological diseases and the role of sodium pump impairment in animal longevity. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00439-009-0673-2) contains supplementary material, which is available to authorized users. Springer-Verlag 2009-05-12 2009 /pmc/articles/PMC2791699/ /pubmed/19455355 http://dx.doi.org/10.1007/s00439-009-0673-2 Text en © The Author(s) 2009 https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. |
spellingShingle | Original Investigation Ashmore, Lesley J. Hrizo, Stacy L. Paul, Sarah M. Van Voorhies, Wayne A. Beitel, Greg J. Palladino, Michael J. Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
title | Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
title_full | Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
title_fullStr | Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
title_full_unstemmed | Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
title_short | Novel mutations affecting the Na, K ATPase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
title_sort | novel mutations affecting the na, k atpase alpha model complex neurological diseases and implicate the sodium pump in increased longevity |
topic | Original Investigation |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2791699/ https://www.ncbi.nlm.nih.gov/pubmed/19455355 http://dx.doi.org/10.1007/s00439-009-0673-2 |
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