{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTRAG‐3—also referred to as CSAG3 in the context of cancer testis antigens—was originally identified as a taxol resistance–associated gene isolated from ovarian carcinoma cells. In normal tissues it is either undetectable or expressed only at low levels except in the testis, where its mRNA is abundant; however, it is frequently re‐expressed in tumors. Epigenetic regulation through DNA methylation plays a key role in this phenomenon, with hypermethylation silencing TRAG‐3 in normal cells and hypomethylation correlating with its activation in tumors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role as a tumor antigen, TRAG‐3 expression is linked with tumor progression and chemoresistance. Elevated levels of TRAG‐3 are observed in advanced stages of cancers such as bladder, gastrointestinal, melanoma, and breast carcinomas, where its overexpression correlates with resistance to antimicrotubule agents (e.g., taxol, docetaxel, paclitaxel, and vinblastine). Additionally, spontaneous interferon‑γ–producing CD4+ T cell responses against a single immunodominant epitope of TRAG‐3 have been documented in patients with metastatic melanoma and breast cancer, highlighting its immunogenic potential as a target for cancer vaccines."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, investigations into the CSAG gene family reveal that members sharing related promoter elements display conserved expression patterns and evolutionary relationships. In this context, studies of proteins such as CSAG2—which directly activates the NAD+‑dependent deacetylase SIRT1 to promote deacetylation of p53 and enhance cell survival under genotoxic stress—and analyses of conserved promoter‐like elements in CSAG family members suggest that CSAG3 may similarly be part of a broader genetic program involved in tumor cell survival and progression. Such findings support the concept that these cancer/testis antigens not only serve as immunological targets, but may also contribute functionally to oncogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Xiaoming Yao, Ji-Fan Hu, Tao Li, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Epigenetic regulation of the taxol resistance-associated gene TRAG-3 in human tumors."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cancer Genet Cytogenet (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.cancergencyto.2003.08.021"}], "href": "https://doi.org/10.1016/j.cancergencyto.2003.08.021"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15120907"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15120907"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Mitsuhiko Ohta, Fumiaki Tanaka, Noriaki Sadanaga, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Expression of the TRAG-3 gene in human esophageal cancer: the frequent synchronous expression of MAGE-3 gene."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Oncol Rep (2006)"}]}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16685391"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16685391"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Bratislav Janjic, Pedro Andrade, Xiao-Fei Wang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Spontaneous CD4+ T cell responses against TRAG-3 in patients with melanoma and breast cancers."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Immunol (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.4049/jimmunol.177.4.2717"}], "href": "https://doi.org/10.4049/jimmunol.177.4.2717"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16888034"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16888034"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Jose A Karam, Sandra Huang, Jinhai Fan, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Upregulation of TRAG3 gene in urothelial carcinoma of the bladder."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Int J Cancer (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/ijc.25631"}], "href": "https://doi.org/10.1002/ijc.25631"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20734393"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20734393"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Martin A Hansen, John E Nielsen, Dorota Retelska, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A shared promoter region suggests a common ancestor for the human VCX/Y, SPANX, and CSAG gene families and the murine CYPT family."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Reprod Dev (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/mrd.20651"}], "href": "https://doi.org/10.1002/mrd.20651"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17342728"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17342728"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Xu Yang, Patrick Ryan Potts "}, {"type": "b", "children": [{"type": "t", "text": "CSAG2 is a cancer-specific activator of SIRT1."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "EMBO Rep (2020)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.15252/embr.202050912"}], "href": "https://doi.org/10.15252/embr.202050912"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "32761762"}], "href": "https://pubmed.ncbi.nlm.nih.gov/32761762"}]}]}]}