UASt drives expression of a full-length Hsap\ATXN3 cDNA bearing an expanded 92x CAG polyglutamine codon repeat, and C-terminally tagged with Tag:MYC in the main reading frame, Tag:HA in the -1 reading frame, and Tag:polyHis in the +1 reading frame. Expression from this transgene leads to production of both mainframe and -1 frameshifted, but not +1 frameshifted, proteins.