Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans.
An increasing number of genes required for mitochondrial biogenesis, dynamics, or function have been found to be mutated in metabolic disorders and neurological diseases such as Leigh Syndrome. In a forward genetic screen to identify genes required for neuronal function and survival in Drosophila ph...
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2012
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oai:doaj.org-article:49c361fbff384663a3cdb4b3869b2dcd2021-11-18T05:36:43ZMutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans.1544-91731545-788510.1371/journal.pbio.1001288https://doaj.org/article/49c361fbff384663a3cdb4b3869b2dcd2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22448145/?tool=EBIhttps://doaj.org/toc/1544-9173https://doaj.org/toc/1545-7885An increasing number of genes required for mitochondrial biogenesis, dynamics, or function have been found to be mutated in metabolic disorders and neurological diseases such as Leigh Syndrome. In a forward genetic screen to identify genes required for neuronal function and survival in Drosophila photoreceptor neurons, we have identified mutations in the mitochondrial methionyl-tRNA synthetase, Aats-met, the homologue of human MARS2. The fly mutants exhibit age-dependent degeneration of photoreceptors, shortened lifespan, and reduced cell proliferation in epithelial tissues. We further observed that these mutants display defects in oxidative phosphorylation, increased Reactive Oxygen Species (ROS), and an upregulated mitochondrial Unfolded Protein Response. With the aid of this knowledge, we identified MARS2 to be mutated in Autosomal Recessive Spastic Ataxia with Leukoencephalopathy (ARSAL) patients. We uncovered complex rearrangements in the MARS2 gene in all ARSAL patients. Analysis of patient cells revealed decreased levels of MARS2 protein and a reduced rate of mitochondrial protein synthesis. Patient cells also exhibited reduced Complex I activity, increased ROS, and a slower cell proliferation rate, similar to Drosophila Aats-met mutants.Vafa BayatIsabelle ThiffaultManish JaiswalMartine TétreaultTaraka DontiFlorin SasarmanGeneviève BernardJulie Demers-LamarcheMarie-Josée DicaireJean MathieuMichel VanasseJean-Pierre BouchardMarie-France RiouxCharles M LourencoZhihong LiClaire HaueterEric A ShoubridgeBrett H GrahamBernard BraisHugo J BellenPublic Library of Science (PLoS)articleBiology (General)QH301-705.5ENPLoS Biology, Vol 10, Iss 3, p e1001288 (2012) |
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Biology (General) QH301-705.5 |
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Biology (General) QH301-705.5 Vafa Bayat Isabelle Thiffault Manish Jaiswal Martine Tétreault Taraka Donti Florin Sasarman Geneviève Bernard Julie Demers-Lamarche Marie-Josée Dicaire Jean Mathieu Michel Vanasse Jean-Pierre Bouchard Marie-France Rioux Charles M Lourenco Zhihong Li Claire Haueter Eric A Shoubridge Brett H Graham Bernard Brais Hugo J Bellen Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans. |
| description |
An increasing number of genes required for mitochondrial biogenesis, dynamics, or function have been found to be mutated in metabolic disorders and neurological diseases such as Leigh Syndrome. In a forward genetic screen to identify genes required for neuronal function and survival in Drosophila photoreceptor neurons, we have identified mutations in the mitochondrial methionyl-tRNA synthetase, Aats-met, the homologue of human MARS2. The fly mutants exhibit age-dependent degeneration of photoreceptors, shortened lifespan, and reduced cell proliferation in epithelial tissues. We further observed that these mutants display defects in oxidative phosphorylation, increased Reactive Oxygen Species (ROS), and an upregulated mitochondrial Unfolded Protein Response. With the aid of this knowledge, we identified MARS2 to be mutated in Autosomal Recessive Spastic Ataxia with Leukoencephalopathy (ARSAL) patients. We uncovered complex rearrangements in the MARS2 gene in all ARSAL patients. Analysis of patient cells revealed decreased levels of MARS2 protein and a reduced rate of mitochondrial protein synthesis. Patient cells also exhibited reduced Complex I activity, increased ROS, and a slower cell proliferation rate, similar to Drosophila Aats-met mutants. |
| format |
article |
| author |
Vafa Bayat Isabelle Thiffault Manish Jaiswal Martine Tétreault Taraka Donti Florin Sasarman Geneviève Bernard Julie Demers-Lamarche Marie-Josée Dicaire Jean Mathieu Michel Vanasse Jean-Pierre Bouchard Marie-France Rioux Charles M Lourenco Zhihong Li Claire Haueter Eric A Shoubridge Brett H Graham Bernard Brais Hugo J Bellen |
| author_facet |
Vafa Bayat Isabelle Thiffault Manish Jaiswal Martine Tétreault Taraka Donti Florin Sasarman Geneviève Bernard Julie Demers-Lamarche Marie-Josée Dicaire Jean Mathieu Michel Vanasse Jean-Pierre Bouchard Marie-France Rioux Charles M Lourenco Zhihong Li Claire Haueter Eric A Shoubridge Brett H Graham Bernard Brais Hugo J Bellen |
| author_sort |
Vafa Bayat |
| title |
Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans. |
| title_short |
Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans. |
| title_full |
Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans. |
| title_fullStr |
Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans. |
| title_full_unstemmed |
Mutations in the mitochondrial methionyl-tRNA synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (ARSAL) in humans. |
| title_sort |
mutations in the mitochondrial methionyl-trna synthetase cause a neurodegenerative phenotype in flies and a recessive ataxia (arsal) in humans. |
| publisher |
Public Library of Science (PLoS) |
| publishDate |
2012 |
| url |
https://doaj.org/article/49c361fbff384663a3cdb4b3869b2dcd |
| work_keys_str_mv |
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