“…The G2 (up-down) also includes proteins located on multiple known AD-risk loci such as SPI1 and Protein Tyrosine Kinase 2 Beta (PTK2B), as well as other proteins known to be implicated on AD or neurodegeneration such as Brain-Derived Neurotrophic Factor (BDNF) 37 , 38 , Cathepsin D (CTSD) 39 , 40 , and Nuclear Factor Kappa B Subunit 1 (NFKB1) 41 , 42 . Some of the key proteins contained in the G3 (linear decrease) group include Carboxylesterase 1 (CES1) 43 , Interleukin 6 (IL6) 44 , 45 , and Forkhead Box O1 (FOXO1) 46 , 47 , which have been implicated in various metabolic, age-, and immune system-related mechanisms that underlie AD pathogenesis. Finally, and consistent with previous study, 48 we found Triggering Receptor Expressed On Myeloid Cells 2 (TREM2) in the G4 (down-up), which showed a decrease from controls to the asymptomatic stage but then significantly elevated levels are noticed in AD individuals.…”