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Down-regulation of torp4a, encoding the Drosophila homologue of TorsinA, results in increased neuronal degeneration

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Muraro, Nara I. and Moffat, Kevin G. (2006) Down-regulation of torp4a, encoding the Drosophila homologue of TorsinA, results in increased neuronal degeneration. JOURNAL OF NEUROBIOLOGY, 66 (12). pp. 1338-1353. doi:10.1002/neu.20313 ISSN 0022-3034.

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Official URL: http://dx.doi.org/10.1002/neu.20313

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Abstract

Early-onset torsion dystonia is a dominant motor disorder linked to mutations in torsinA. TorsinA is weakly related to a superfamily of chaperone-like proteins. The function of the torsin group remains largely unknown. Here we use RNAi and over-expression to analyze the function of torp4a, the only Drosophila torsin. Targeted down-regulation in the eye causes progressive degeneration of the retina. Conversely, over-expression of torp4a protects from age-related degeneration. In the retinas of young animals, a correlation with the lysosome-related organelle, the pigment granule, is also observed. Lowering torp4a causes an increase in pigment granules, while over-expression causes loss of granules. We have performed a screen for genetic interactors of torp4a identifying a number mutants, including two members of the AP-3 complex. Other genetic interactors found included genes related to actin and myosin function. Our findings implicate the Drosophila torsin, torp4a, to function with molecules consistent with already predicted roles in the endoplasmic reticulum/nuclear envelope compartment, and have identified potential new interactions with AP-3 like components. (c) 2006 Wiley Periodicals, Inc.

Item Type: Journal Article
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Journal or Publication Title: JOURNAL OF NEUROBIOLOGY
Publisher: JOHN WILEY & SONS INC
ISSN: 0022-3034
Official Date: October 2006
Dates:
DateEvent
October 2006UNSPECIFIED
Volume: 66
Number: 12
Number of Pages: 16
Page Range: pp. 1338-1353
DOI: 10.1002/neu.20313
Publication Status: Published

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