{"gene":"TRERF1","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2006,"finding":"TRERF1 (TReP-132) directly binds to terminal deoxynucleotidyltransferase (TdT) through TdT's confined N-terminal region, and co-expression in COS7 cells shows nuclear co-localization; TReP-132 reduces TdT enzymatic activity to ~2.5% of maximum in an in vitro assay using double-stranded DNA with a 3' protrusion as primer, suggesting negative regulation of N-region synthesis during V(D)J recombination.","method":"Yeast two-hybrid, pull-down assay, immunoprecipitation with specific antibodies (in vitro and in vivo), co-expression/co-localization in COS7 cells, in vitro TdT activity assay","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (Y2H, pulldown, IP, co-localization, in vitro enzymatic assay) in a single study with rigorous controls","pmids":["16371131"],"is_preprint":false},{"year":1997,"finding":"The TRERF1 locus (designated BCAR2, breast-cancer-anti-estrogen-resistance locus 2) was identified as a common retroviral integration site that confers tamoxifen resistance to estrogen-dependent ZR-75-1 human breast-cancer cells in a dominant manner, placing it in a pathway that controls estrogen dependency of breast cancer cells.","method":"Retroviral insertion mutagenesis, somatic cell fusion gene transfer, co-segregation analysis in 29 somatic-cell hybrid clones","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis/co-segregation with functional phenotype in cell-based system, single lab, no molecular mechanism of TRERF1 protein itself defined","pmids":["9259413"],"is_preprint":false}],"current_model":"TRERF1 (TReP-132) functions as a nuclear transcriptional regulator that directly binds TdT and its interacting partner TdIF1, suppressing TdT enzymatic activity during V(D)J recombination, and was independently identified as a dominant oncogenic locus (BCAR2) whose activation confers anti-estrogen resistance in human breast cancer cells."},"narrative":{"teleology":[{"year":1997,"claim":"Before TRERF1's molecular function was known, retroviral insertion mutagenesis established that activation of this locus (BCAR2) dominantly overrides estrogen dependency in breast cancer cells, revealing it as a potential oncogenic effector of anti-estrogen resistance.","evidence":"Retroviral insertion mutagenesis and somatic cell fusion gene transfer with co-segregation analysis in ZR-75-1 breast cancer cells","pmids":["9259413"],"confidence":"Medium","gaps":["No molecular characterization of the TRERF1 protein product or its mechanism of action in conferring tamoxifen resistance","Single cell line system; generalizability to other breast cancer models not tested","Pathway connecting TRERF1 activation to estrogen receptor signaling bypass not defined"]},{"year":2006,"claim":"The question of what molecular activity TRERF1 protein performs was answered by showing it directly binds TdT and potently inhibits TdT enzymatic activity, establishing TRERF1 as a negative regulator of template-independent nucleotide addition during V(D)J recombination.","evidence":"Yeast two-hybrid, pull-down, immunoprecipitation, co-localization in COS7 cells, and in vitro TdT activity assay with dsDNA primer","pmids":["16371131"],"confidence":"High","gaps":["Physiological relevance of TdT inhibition not tested in developing lymphocytes or in vivo V(D)J recombination systems","Structural basis of the TRERF1–TdT interaction is undefined","Whether the transcriptional regulatory activity of TRERF1 is mechanistically linked to its TdT-inhibitory function remains unresolved"]},{"year":null,"claim":"The relationship between TRERF1's two described functions — TdT suppression in V(D)J recombination and anti-estrogen resistance in breast cancer — remains mechanistically unconnected, and in vivo validation in both contexts is lacking.","evidence":"","pmids":[],"confidence":"Low","gaps":["No in vivo genetic model (knockout or conditional) to define physiological roles","Transcriptional target genes of TRERF1 are not identified","Mechanism linking TRERF1 to estrogen receptor signaling or tamoxifen resistance pathway unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[],"complexes":[],"partners":["TDT"],"other_free_text":[]},"mechanistic_narrative":"TRERF1 (TReP-132/BCAR2) is a nuclear transcriptional regulator that directly binds terminal deoxynucleotidyltransferase (TdT) through TdT's N-terminal region and suppresses TdT enzymatic activity to ~2.5% of its maximum, functioning as a negative regulator of N-region nucleotide addition during V(D)J recombination [PMID:16371131]. The TRERF1 locus was independently identified as a dominant oncogenic locus (BCAR2) whose retroviral activation confers tamoxifen resistance to estrogen-dependent breast cancer cells [PMID:9259413]."},"prefetch_data":{"uniprot":{"accession":"Q96PN7","full_name":"Transcriptional-regulating factor 1","aliases":["Breast cancer anti-estrogen resistance 2","Transcriptional-regulating protein 132","Zinc finger protein rapa","Zinc finger transcription factor TReP-132"],"length_aa":1200,"mass_kda":132.3,"function":"Binds DNA and activates transcription of CYP11A1. Interaction with CREBBP and EP300 results in a synergistic transcriptional activation of CYP11A1","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96PN7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRERF1","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRERF1","total_profiled":1310},"omim":[{"mim_id":"610322","title":"TRANSCRIPTIONAL REGULATING FACTOR 1; TRERF1","url":"https://www.omim.org/entry/610322"},{"mim_id":"184757","title":"NUCLEAR RECEPTOR SUBFAMILY 5, GROUP A, MEMBER 1; 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two-hybrid, pull-down assay, immunoprecipitation with specific antibodies (in vitro and in vivo), co-expression/co-localization in COS7 cells, in vitro TdT activity assay\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (Y2H, pulldown, IP, co-localization, in vitro enzymatic assay) in a single study with rigorous controls\",\n      \"pmids\": [\"16371131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The TRERF1 locus (designated BCAR2, breast-cancer-anti-estrogen-resistance locus 2) was identified as a common retroviral integration site that confers tamoxifen resistance to estrogen-dependent ZR-75-1 human breast-cancer cells in a dominant manner, placing it in a pathway that controls estrogen dependency of breast cancer cells.\",\n      \"method\": \"Retroviral insertion mutagenesis, somatic cell fusion gene transfer, co-segregation analysis in 29 somatic-cell hybrid clones\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis/co-segregation with functional phenotype in cell-based system, single lab, no molecular mechanism of TRERF1 protein itself defined\",\n      \"pmids\": [\"9259413\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRERF1 (TReP-132) functions as a nuclear transcriptional regulator that directly binds TdT and its interacting partner TdIF1, suppressing TdT enzymatic activity during V(D)J recombination, and was independently identified as a dominant oncogenic locus (BCAR2) whose activation confers anti-estrogen resistance in human breast cancer cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRERF1 (TReP-132/BCAR2) is a nuclear transcriptional regulator that directly binds terminal deoxynucleotidyltransferase (TdT) through TdT's N-terminal region and suppresses TdT enzymatic activity to ~2.5% of its maximum, functioning as a negative regulator of N-region nucleotide addition during V(D)J recombination [PMID:16371131]. The TRERF1 locus was independently identified as a dominant oncogenic locus (BCAR2) whose retroviral activation confers tamoxifen resistance to estrogen-dependent breast cancer cells [PMID:9259413].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Before TRERF1's molecular function was known, retroviral insertion mutagenesis established that activation of this locus (BCAR2) dominantly overrides estrogen dependency in breast cancer cells, revealing it as a potential oncogenic effector of anti-estrogen resistance.\",\n      \"evidence\": \"Retroviral insertion mutagenesis and somatic cell fusion gene transfer with co-segregation analysis in ZR-75-1 breast cancer cells\",\n      \"pmids\": [\"9259413\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No molecular characterization of the TRERF1 protein product or its mechanism of action in conferring tamoxifen resistance\",\n        \"Single cell line system; generalizability to other breast cancer models not tested\",\n        \"Pathway connecting TRERF1 activation to estrogen receptor signaling bypass not defined\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The question of what molecular activity TRERF1 protein performs was answered by showing it directly binds TdT and potently inhibits TdT enzymatic activity, establishing TRERF1 as a negative regulator of template-independent nucleotide addition during V(D)J recombination.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down, immunoprecipitation, co-localization in COS7 cells, and in vitro TdT activity assay with dsDNA primer\",\n      \"pmids\": [\"16371131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Physiological relevance of TdT inhibition not tested in developing lymphocytes or in vivo V(D)J recombination systems\",\n        \"Structural basis of the TRERF1–TdT interaction is undefined\",\n        \"Whether the transcriptional regulatory activity of TRERF1 is mechanistically linked to its TdT-inhibitory function remains unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The relationship between TRERF1's two described functions — TdT suppression in V(D)J recombination and anti-estrogen resistance in breast cancer — remains mechanistically unconnected, and in vivo validation in both contexts is lacking.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vivo genetic model (knockout or conditional) to define physiological roles\",\n        \"Transcriptional target genes of TRERF1 are not identified\",\n        \"Mechanism linking TRERF1 to estrogen receptor signaling or tamoxifen resistance pathway unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"TdT\"],\n    \"other_free_text\": []\n  }\n}\n```"}