UAS regulatory sequences drive expression of a truncated form of Hsap\ATXN3, consisting of a Q repeat region of 76 residues (which contains both α-helical coiled-coil and β-sheet hairpin structures) flanked upstream by 14 amino acids and downstream by 43 amino acids. The protein is tagged at the N-terminal end with Tag:HA and at the C-terminal end with Tag:MYC.
Expressing Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC under the control of Scer\GAL4ppk.PU results in severe reductions in the number of terminal dendrites and dendrite branch points of class IV dendritic arborizing neurons in third instar larvae compared to wild-type controls, while Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC proteins accumulate in the nucleus.
Expressing Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC under the control of Scer\GAL4109(2)80 results in a severely disrupted actin cytoskeleton in distal dendrites of dendritic arborizing neurons in third instar larvae. Third instar larvae are significantly less motile and show more frequent head turning than wild-type controls.
Expressing Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC under the control of Scer\GAL4221 has no effect on dendrite morphology in class I dendritic arborizing neurons.
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4ppk.PU has abnormal neuroanatomy | third instar larval stage phenotype, suppressible | partially by foxoUAS.cPa, Scer\GAL4ppk.PU
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4ppk.PU has abnormal neuroanatomy | third instar larval stage phenotype, suppressible | partially by DnaJ-1UAS.cKa, Scer\GAL4ppk.PU
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4109(2)80 has abnormal locomotor behavior | third instar larval stage phenotype, non-suppressible by foxoUAS.cPa, Scer\GAL4109(2)80
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4221 is a suppressor of abnormal neuroanatomy | third instar larval stage phenotype of Scer\GAL4221, ctUAS.cUa
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4ppk.PU has larval multidendritic class IV neuron | third instar larval stage phenotype, suppressible | partially by foxoUAS.cPa, Scer\GAL4ppk.PU
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4ppk.PU has larval multidendritic class IV neuron | third instar larval stage phenotype, suppressible | partially by DnaJ-1UAS.cKa, Scer\GAL4ppk.PU
Hsap\ATXN3tr.Q76.UAS.Tag:HA,Tag:MYC, Scer\GAL4221 is a suppressor of larval multidendritic class I neuron | third instar larval stage phenotype of Scer\GAL4221, ctUAS.cUa