UAS regulates expression of the Tag:HA-tagged Hnf4 ORF containing the R167W mutation, which corresponds to the R85W mutation in human 'HNF4A' (aka'MODY1') associated with Fanconi renotubular syndrome (FRTS). This construct also contains a S169A mutation, which is equivalent to S87A in human 'HNF4A' (aka'MODY1'), thus suppressing PKC-dependent phosphorylation at that position and thereby also suppressing Hnf4 nuclear export and consequent cytotoxic effects.