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Huntingtons disease (HD) is a progressive neurodegenerative disorder caused by dominant polyglutamine expansion within the N-terminus of huntingtin protein.Metal accumulation in the striatum of HD patients has been reported for many years,but the significance of this in HD pathogenesis remains unknown.Here using a Drosophila model of HD,we screened various metal genes for their modulating effects.Two copper metabolism genes were found linked to HD pathogenesis.Our results indicate a direct link of copper with HD and suggest that decreasing copper level in the brain might provide therapeutic benefits for the treatment of this disease.