The use of a genetic method to down-regulate RBO/EFR3/EFR3A/EFR3B proteins, TTC7 protein or PI4KIIIα enzyme protein which interacts with RBO/EFR3/EFR3A/EFR3B proteins and TTC7 protein, or the use of a drug to inhibit PI4KIIIα protein kinase activity reduces the accumulation of Aβ