A double transgenic non-human animal, in particular a transgenic mouse encoding Qpct proteins, which have been implicated in Qpct-related diseases, and Amyloid Precursor Protein (APP). Also provided are cells and cell lines comprising transgenes encoding for Qpct and APP. Also provided are methods and compositions for evaluating agents that affect Qpct, for use in compositions for the treatment of Qpct-related diseases.
