Dtorsin, the Drosophila ortholog of the early-onset dystonia TOR1A (DYT1), plays a novel role in dopamine metabolism

Noriko Wakabayashi-Ito, Olugbenga M. Doherty, Hideaki Moriyama, Xandra O. Breakefield, James F. Gusella, Janis M. O'Donnell, Naoto Ito

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Dystonia represents the third most common movement disorder in humans. At least 15 genetic loci (DYT1-15) have been identified and some of these genes have been cloned. TOR1A (formally DYT1), the gene responsible for the most common primary hereditary dystonia, encodes torsinA, an AAA ATPase family protein. However, the function of torsinA has yet to be fully understood. Here, we have generated and characterized a complete loss-of-function mutant for dtorsin, the only Drosophila ortholog of TOR1A. Null mutation of the X-linked dtorsin was semi-lethal with most male flies dying by the pre-pupal stage and the few surviving adults being sterile and slow moving, with reduced cuticle pigmentation and thin, short bristles. Third instar male larvae exhibited locomotion defects that were rescued by feeding dopamine. Moreover, biochemical analysis revealed that the brains of third instar larvae and adults heterozygous for the loss-of-function dtorsin mutation had significantly reduced dopamine levels. The dtorsin mutant showed a very strong genetic interaction with Pu (Punch: GTP cyclohydrolase), the ortholog of the human gene underlying DYT14 dystonia. Biochemical analyses revealed a severe reduction of GTP cyclohydrolase protein and activity, suggesting that dtorsin plays a novel role in dopamine metabolism as a positive-regulator of GTP cyclohydrolase protein. This dtorsin mutant line will be valuable for understanding this relationship and potentially other novel torsin functions that could play a role in human dystonia.

Original languageEnglish (US)
Article numbere26183
JournalPloS one
Volume6
Issue number10
DOIs
StatePublished - Oct 12 2011

Fingerprint

Dystonia
GTP Cyclohydrolase
dopamine
Metabolism
Drosophila
Dopamine
mutants
metabolism
Genes
Dystonic Disorders
instars
movement disorders
genes
proteins
larvae
setae (animal)
Larva
lethal genes
pigmentation
Proteins

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

Cite this

Wakabayashi-Ito, N., Doherty, O. M., Moriyama, H., Breakefield, X. O., Gusella, J. F., O'Donnell, J. M., & Ito, N. (2011). Dtorsin, the Drosophila ortholog of the early-onset dystonia TOR1A (DYT1), plays a novel role in dopamine metabolism. PloS one, 6(10), [e26183]. https://doi.org/10.1371/journal.pone.0026183

Dtorsin, the Drosophila ortholog of the early-onset dystonia TOR1A (DYT1), plays a novel role in dopamine metabolism. / Wakabayashi-Ito, Noriko; Doherty, Olugbenga M.; Moriyama, Hideaki; Breakefield, Xandra O.; Gusella, James F.; O'Donnell, Janis M.; Ito, Naoto.

In: PloS one, Vol. 6, No. 10, e26183, 12.10.2011.

Research output: Contribution to journalArticle

Wakabayashi-Ito, N, Doherty, OM, Moriyama, H, Breakefield, XO, Gusella, JF, O'Donnell, JM & Ito, N 2011, 'Dtorsin, the Drosophila ortholog of the early-onset dystonia TOR1A (DYT1), plays a novel role in dopamine metabolism', PloS one, vol. 6, no. 10, e26183. https://doi.org/10.1371/journal.pone.0026183
Wakabayashi-Ito, Noriko ; Doherty, Olugbenga M. ; Moriyama, Hideaki ; Breakefield, Xandra O. ; Gusella, James F. ; O'Donnell, Janis M. ; Ito, Naoto. / Dtorsin, the Drosophila ortholog of the early-onset dystonia TOR1A (DYT1), plays a novel role in dopamine metabolism. In: PloS one. 2011 ; Vol. 6, No. 10.
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