{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Interferon‐ε (IFNε) is a uniquely regulated type I interferon that distinguishes itself from its counterparts by its tissue‐restricted, constitutive expression and specialized role in mucosal and reproductive immunity. Unlike typical type I IFNs that are rapidly induced upon viral infection, IFNε is produced at steady state by epithelial cells of the female (and male) reproductive tract, where its expression is hormonally regulated—rising during phases such as the progesterone‐dominated cycle, pregnancy, and in response to local inflammatory cytokines—to establish a preemptive antiviral state."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": " In this specialized environment, IFNε signals via the common IFNAR receptor complex to upregulate interferon‐stimulated genes and host restriction factors, thereby limiting the replication of pathogens such as herpes simplex virus, Chlamydia, and HIV at mucosal surfaces."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Moreover, studies in high‐risk populations have associated elevated cervical IFNε expression with reduced susceptibility to HIV, suggesting that persistent, tissue‐intrinsic IFNε production contributes to a protective microenvironment in the genital tract."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Similar findings in equine endometrium further highlight its role in reproductive tract immunity, while biochemical characterization reveals that IFNε binds the IFNAR complex with a distinctive receptor affinity profile that may tailor its signaling to avoid excessive inflammation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, clinical investigations in pregnant women indicate that although IFNε levels rise over the course of gestation, they are diminished in the context of genital herpes simplex virus infection, underscoring its functional relevance in maintaining mucosal defense."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Matthew P Hardy, Catherine M Owczarek, Lars S Jermiin, et al. 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