ERN1 and Alzheimer disease: Genes involved in AD pathogenesis, including proteins in the amyloid pathway such as nicastrin (NCT) and neprilysin 1 (NEP-1); antioxidant proteins such as superoxide dismutase type 1 (SOD1), glutathione peroxidase (GPx), and glutathione S transferase D1 (GSTD1); and proteins in endoplasmic reticulum (ER) stress such as activating transcription factor 6 (ATF-6), inositol-requiring enzyme (IRE-1), protein kinase R-like endoplasmic reticulum kinase (PERK or PEK), and molecular chaperone-binding immunoglobulin (Bip), were studied for their expression using RT-qPCR.