Abstract
The exonuclease three prime repair exonuclease 1 (TREX1) safeguards the cell against DNA accumulation in the cytosol and thereby prevents innate immune activation and autoimmunity. TREX1 mutations lead to chronic DNA damage and a cell-intrinsic type I interferon (IFN) response. Associated disease phenotypes include Aicardi-Goutières syndrome, familial chilblain lupus and systemic lupus erythematosus. Given the role of ultraviolet (UV) light in lupus pathogenesis, we assessed sensitivity to UV light in lupus patients with TREX1 mutation by phototesting which revealed an enhanced photosensitivity compared to healthy controls.
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