DPP9 and age-related macular degeneration: Of the 213 AMD-associated genes in our samples, 13 were involved in the proteostasis network (MARK4, ATP6V0D1, DAPK3, SNX7, BAG6, HERPUD1, NPLOC4, TOMM40, RPL3, HERC2, BARD1, BRAP and DPP9).