Interpreting the Role of IRF1 in Oxidized Mitochondrial DNA-Driven PANoptosis

Zhang et al. proposed that interferon regulatory factor 1 (IRF1) mediates sensing of oxidized mitochondrial DNA (ox-mtDNA) and promotes macrophage PANoptosis during lung ischemia-reperfusion injury. Their findings provide important mechanistic and translational insights into mitochondrial damage-driven inflammatory cell death. This letter highlights a key distinction between demonstrating that IRF1 is functionally required downstream of ox-mtDNA release and establishing IRF1 as a direct nucleic-acid sensor. IRF1 is primarily characterized as a transcription factor, whereas cytosolic mitochondrial DNA is generally recognized through established nucleic-acid sensing pathways, including cGAS-STING and, depending on cellular localization, TLR9. The available evidence therefore supports IRF1 as a critical downstream mediator of ox-mtDNA-associated signaling rather than conclusively identifying it as the proximal molecular sensor. Further experiments assessing canonical DNA-sensing pathways and direct IRF1-DNA interactions may clarify the molecular ordering of this pathway and refine its therapeutic implications in lung ischemia-reperfusion injury.