UASt regulates expression of a nonsense mutant of Vhl - a c.172delG frameshift mutation located in exon 1 of Vhl, corresponding to the c.163delG pathogenic mutation in human VHL.
Analogous c.163delG mutation in human VHL implicated in von Hippel-Lindau syndrome; mutation carried on in vitro construct. Deletion of a single nucleotide results in a frameshift and a premature stop shortly thereafter.