A 1.5kb Psn promoter regulatory sequence (PEPC - Psn endogenous promoter cassette) drives expression of the longer isoform of Psn, mutated to carry an amino acid substitution that is equivalent to a M146L mutation in the orthologous human PSEN1 gene, a variant associated with familial Alzheimer disease.
PsnM146L.PEPC.L flies generally exhibit a weak neurogenic phenotype, with mild eye phenotypes including supernumerary photoreceptor cells, wing notching, and mild abnormal thoracic bristle patterning.