UASt regulates expression of Hsap\UBQLN2 bearing a single point mutation, F594A, in its UBA domain, thereby abolishing its Ubiquitin association.
The expression from two copies of Hsap\UBQLN2UBA.UAS under the control of Scer\GAL4GMR.PF does not lead to an obvious eye phenotype (namely in number of bristles or in eye pigmentation) but induces a minor decrease in climbing ability in adults.