FRRS1 (ferric chelate reductase 1) is a ferric reductase enzyme that catalyzes the reduction of Fe(3+) to Fe(2+), facilitating iron homeostasis and cellular iron import 1. The protein functions in mitochondrial electron transport and the tricarboxylic acid cycle, playing a central role in iron metabolism 1. Mechanistically, FRRS1 regulates ferroptosis—a form of iron-dependent cell death—through the Hippo signaling pathway, with FRRS1 overexpression suppressing ferroptosis by inhibiting LATS1/YAP/TAZ activity and promoting GPX4 expression while reducing ACSL4 levels 1. FRRS1 expression is modulated by the transcription factor MITF, which coordinates iron homeostasis in macrophages and epithelial cells during inflammatory responses 2. Dysregulation of FRRS1 has been implicated in multiple disease states: it is a putative antigen for glioma mRNA vaccination 3, shows consistent overexpression in multimorbid allergic diseases (asthma, dermatitis, rhinitis) 4, and is a potential Alzheimer's disease risk gene connected to immune and tau-related pathways 5. Additionally, FRRS1 expression is upregulated by lncRNA HOXD-AS1 through ELF1-mediated transcription, promoting cervical cancer cell proliferation 6. These findings suggest FRRS1 serves as a critical iron homeostasis regulator with therapeutic potential in intestinal ischemia, neuroinflammatory, allergic, and malignant disease contexts.