DUOXA1 (dual oxidase maturation factor 1) is an essential protein that enables the functional expression of DUOX1, a key enzyme in thyroid hormone synthesis and host defense. DUOXA1 mediates the maturation and transport of DUOX1 from the endoplasmic reticulum to the apical plasma membrane of epithelial cells 1. Recent structural studies demonstrate that DUOXA1 recruits DUOX1 specifically to the apical cell membrane through N-glycosylation-dependent mechanisms distinct from its paralog DUOXA2 2. Once properly localized, DUOX1 catalyzes hydrogen peroxide synthesis in a calcium- and NADPH-dependent manner, which is critical for iodide oxidation during thyroid hormone biosynthesis 3. DUOXA1 mutations cause congenital hypothyroidism (CH), a leading cause of preventable neonatal neurological dysfunction. Biallelic DUOXA1 mutations are identified in approximately 5-20% of CH cases, often co-occurring with DUOX2 variants 45. Disease severity correlates with DUOX system dysfunction, as patients with DUOXA1 mutations require higher levothyroxine replacement doses and more frequently develop transient CH phenotypes 6. Beyond thyroid function, DUOXA1-dependent DUOX1 hydrogen peroxide production contributes to innate immunity; DUOXA1 variants have been associated with susceptibility to severe disseminated coccidioidomycosis through impaired pathogen recognition 7.