Genetic and chemical modifiers of a CUG toxicity model in Drosophila.
Non-coding CUG repeat expansions interfere with the activity of human Muscleblind-like (MBNL) proteins contributing to myotonic dystrophy 1 (DM1). To understand this toxic RNA gain-of-function mechanism we developed a Drosophila model expressing 60 pure and 480 interrupted CUG repeats in the context...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2008-02-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC2220037?pdf=render |
| _version_ | 1818310204580691968 |
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| author | Amparo Garcia-Lopez Lidon Monferrer Irma Garcia-Alcover Marta Vicente-Crespo M Carmen Alvarez-Abril Ruben D Artero |
| author_facet | Amparo Garcia-Lopez Lidon Monferrer Irma Garcia-Alcover Marta Vicente-Crespo M Carmen Alvarez-Abril Ruben D Artero |
| author_sort | Amparo Garcia-Lopez |
| collection | DOAJ |
| description | Non-coding CUG repeat expansions interfere with the activity of human Muscleblind-like (MBNL) proteins contributing to myotonic dystrophy 1 (DM1). To understand this toxic RNA gain-of-function mechanism we developed a Drosophila model expressing 60 pure and 480 interrupted CUG repeats in the context of a non-translatable RNA. These flies reproduced aspects of the DM1 pathology, most notably nuclear accumulation of CUG transcripts, muscle degeneration, splicing misregulation, and diminished Muscleblind function in vivo. Reduced Muscleblind activity was evident from the sensitivity of CUG-induced phenotypes to a decrease in muscleblind genetic dosage and rescue by MBNL1 expression, and further supported by the co-localization of Muscleblind and CUG repeat RNA in ribonuclear foci. Targeted expression of CUG repeats to the developing eye and brain mushroom bodies was toxic leading to rough eyes and semilethality, respectively. These phenotypes were utilized to identify genetic and chemical modifiers of the CUG-induced toxicity. 15 genetic modifiers of the rough eye phenotype were isolated. These genes identify putative cellular processes unknown to be altered by CUG repeat RNA, and they include mRNA export factor Aly, apoptosis inhibitor Thread, chromatin remodelling factor Nurf-38, and extracellular matrix structural component Viking. Ten chemical compounds suppressed the semilethal phenotype. These compounds significantly improved viability of CUG expressing flies and included non-steroidal anti-inflammatory agents (ketoprofen), muscarinic, cholinergic and histamine receptor inhibitors (orphenadrine), and drugs that can affect sodium and calcium metabolism such as clenbuterol and spironolactone. These findings provide new insights into the DM1 phenotype, and suggest novel candidates for DM1 treatments. |
| first_indexed | 2024-12-13T07:42:21Z |
| format | Article |
| id | doaj.art-b690e444b6344a548e5b9b1958a7383a |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-13T07:42:21Z |
| publishDate | 2008-02-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-b690e444b6344a548e5b9b1958a7383a2022-12-21T23:54:56ZengPublic Library of Science (PLoS)PLoS ONE1932-62032008-02-0132e159510.1371/journal.pone.0001595Genetic and chemical modifiers of a CUG toxicity model in Drosophila.Amparo Garcia-LopezLidon MonferrerIrma Garcia-AlcoverMarta Vicente-CrespoM Carmen Alvarez-AbrilRuben D ArteroNon-coding CUG repeat expansions interfere with the activity of human Muscleblind-like (MBNL) proteins contributing to myotonic dystrophy 1 (DM1). To understand this toxic RNA gain-of-function mechanism we developed a Drosophila model expressing 60 pure and 480 interrupted CUG repeats in the context of a non-translatable RNA. These flies reproduced aspects of the DM1 pathology, most notably nuclear accumulation of CUG transcripts, muscle degeneration, splicing misregulation, and diminished Muscleblind function in vivo. Reduced Muscleblind activity was evident from the sensitivity of CUG-induced phenotypes to a decrease in muscleblind genetic dosage and rescue by MBNL1 expression, and further supported by the co-localization of Muscleblind and CUG repeat RNA in ribonuclear foci. Targeted expression of CUG repeats to the developing eye and brain mushroom bodies was toxic leading to rough eyes and semilethality, respectively. These phenotypes were utilized to identify genetic and chemical modifiers of the CUG-induced toxicity. 15 genetic modifiers of the rough eye phenotype were isolated. These genes identify putative cellular processes unknown to be altered by CUG repeat RNA, and they include mRNA export factor Aly, apoptosis inhibitor Thread, chromatin remodelling factor Nurf-38, and extracellular matrix structural component Viking. Ten chemical compounds suppressed the semilethal phenotype. These compounds significantly improved viability of CUG expressing flies and included non-steroidal anti-inflammatory agents (ketoprofen), muscarinic, cholinergic and histamine receptor inhibitors (orphenadrine), and drugs that can affect sodium and calcium metabolism such as clenbuterol and spironolactone. These findings provide new insights into the DM1 phenotype, and suggest novel candidates for DM1 treatments.http://europepmc.org/articles/PMC2220037?pdf=render |
| spellingShingle | Amparo Garcia-Lopez Lidon Monferrer Irma Garcia-Alcover Marta Vicente-Crespo M Carmen Alvarez-Abril Ruben D Artero Genetic and chemical modifiers of a CUG toxicity model in Drosophila. PLoS ONE |
| title | Genetic and chemical modifiers of a CUG toxicity model in Drosophila. |
| title_full | Genetic and chemical modifiers of a CUG toxicity model in Drosophila. |
| title_fullStr | Genetic and chemical modifiers of a CUG toxicity model in Drosophila. |
| title_full_unstemmed | Genetic and chemical modifiers of a CUG toxicity model in Drosophila. |
| title_short | Genetic and chemical modifiers of a CUG toxicity model in Drosophila. |
| title_sort | genetic and chemical modifiers of a cug toxicity model in drosophila |
| url | http://europepmc.org/articles/PMC2220037?pdf=render |
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