DUOX1 (dual oxidase 1) is a membrane-bound NADPH oxidase that generates hydrogen peroxide (H2O2) for essential physiological processes 1. The enzyme plays a critical role in thyroid hormone synthesis by producing H2O2 required for thyroid peroxidase activity 1. DUOX1 also contributes to antimicrobial defense at mucosal surfaces through lactoperoxidase-mediated production of hypothiocyanite, which can inactivate pathogens including influenza virus 1. The protein contains functional domains including FAD and NADPH binding sites, and exhibits both oxidase and potential peroxidase activities through its N-terminal peroxidase-like domain 1. In disease contexts, DUOX1 expression is frequently dysregulated, particularly being silenced in epithelial-derived cancers through epigenetic mechanisms 1. While primarily expressed in epithelial tissues under normal conditions, DUOX1 dysfunction interferes with oxidative metabolism and contributes to various disease pathologies 1. The enzyme requires its maturation factor DUOXA1 for proper function, and both proteins are important therapeutic targets due to their role in cellular redox pathways 1. Understanding DUOX1's mechanistic functions in disease pathophysiology may provide valuable diagnostic tools and novel therapeutic approaches 1.