{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n ERV3-1 is a human endogenous retroviral envelope gene that, despite encoding a truncated protein, appears to have been conserved during primate evolution, suggesting a beneficial role in human physiology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In the placenta, ERV3-1 is one of several HERV envelope genes whose expression is tightly controlled by epigenetic mechanisms. In normal trophoblasts, its transcription is developmentally regulated through DNA methylation, and its envelope protein is expressed in a stage‐specific manner to support placental functions such as trophoblast differentiation and syncytiotrophoblast formation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Conversely, aberrant regulation of ERV3-1 expression has been observed in pathological pregnancies; for instance, its downregulation in complete hydatidiform moles and gestational trophoblastic neoplasia may reflect altered envelope function during abnormal placentogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Outside of placental biology, ERV3-1 has been implicated in cancer. Transcriptome analyses in acute myeloid leukemia (AML) patients have revealed uniformly high ERV3-1 expression, with differential levels observed between myeloid and monocytic lineages and possible associations with chromosomal abnormalities such as trisomy of chromosome 8."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Furthermore, treatment with hypomethylating agents such as decitabine can derepress ERV3-1 by inducing promoter demethylation and increasing chromatin accessibility, suggesting that the gene’s epigenetic regulation may play a role in leukemogenesis or therapeutic response."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In placental trophoblast cell models, exposure to environmental agents like bisphenol A (BPA) not only increased the transcription and protein levels of classical syncytialization markers but also specifically induced ERV3-1 expression, further supporting its contribution to the syncytiotrophoblast phenotype and placental development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In addition, analyses in immune and inflammatory contexts indicate that ERV3-1 expression may be under genetic control, as expression quantitative trait locus (eQTL) studies in effector T cells have linked its regulation to Crohn’s disease susceptibility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, in studies of cellular responses to stress such as ionizing radiation, ERV3-1 has emerged from gene network analyses as part of a complex expression signature associated with radioresistance in head and neck squamous cell carcinoma cells. This radiation‐induced expression suggests that ERV3-1 may play a role in the adaptive cellular response to genotoxic stress."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, ERV3-1 functions as a conserved retroviral envelope gene with important roles in placental differentiation and possibly in modulating cellular and immune responses in cancer and inflammatory diseases. Its epigenetic regulation by DNA methylation and responsiveness to environmental and therapeutic agents highlight its potential as both a developmental and disease-associated biomarker.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "C A Hervé, G Forrest, R Löwer, et al. 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