{"gene":"RTKN","run_date":"2026-06-10T07:46:28","timeline":{"discoveries":[{"year":2009,"finding":"RTKN is a direct target of miR-145: the miR-145 binding site was experimentally confirmed in the RTKN 3'UTR using reporter constructs, and overexpression of miR-145 reduced RTKN protein and mRNA levels in MCF-7 cells. siRNA-mediated knockdown of RTKN phenocopied miR-145 overexpression by inhibiting MCF-7 cell growth.","method":"Luciferase reporter assay (3'UTR), siRNA knockdown, Western blot, RT-PCR","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay confirms direct 3'UTR binding, siRNA KD with defined proliferation phenotype, single lab with two orthogonal methods","pmids":["19360360"],"is_preprint":false},{"year":2016,"finding":"RTKN functions as an oncogene in hepatocellular carcinoma: overexpression promotes proliferation and inhibits apoptosis, while silencing has the opposite effect. The growth-promoting effect of RTKN operates through NF-κB signaling and G2/M phase arrest when inhibited. RTKN is a direct target of miR-152, which reverses RTKN-driven HCC cell growth.","method":"Overexpression and siRNA knockdown in HepG2/Hep3B cells, flow cytometry (apoptosis/cell cycle), luciferase reporter assay for miR-152 targeting of RTKN 3'UTR","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with defined cellular phenotypes plus reporter assay, single lab with multiple orthogonal methods","pmids":["27922690"],"is_preprint":false},{"year":2016,"finding":"RTKN is a direct target of let-7a in colon cancer: let-7a overexpression inhibits colon cancer cell growth and metastasis by directly downregulating RTKN, and re-introduction of RTKN into let-7a-overexpressing cells rescues the inhibitory phenotype.","method":"let-7a mimic transfection, RTKN rescue experiment, cell growth and metastasis assays in HCT-116 and SW620 cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rescue experiment establishes epistatic relationship between let-7a and RTKN in growth/metastasis, single lab","pmids":["27498032"],"is_preprint":false},{"year":2021,"finding":"RTKN acts downstream of miR-145-5p and upstream of the Wnt/β-catenin pathway in kidney ischemia-reperfusion injury: the lncRNA MEG3 sequesters miR-145-5p to upregulate RTKN, which in turn activates Wnt/β-catenin signaling and promotes mitophagy and apoptosis in HK-2 cells. c-MYC transcriptionally activates MEG3, forming a positive feedback loop.","method":"RNA pulldown/luciferase reporter for MEG3-miR-145-5p interaction; luciferase reporter and Western blot for miR-145-5p targeting of RTKN 3'UTR; siRNA knockdown of MEG3/RTKN; Wnt/β-catenin pathway readouts; in vivo IRI mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, KD, pathway readouts, in vivo model) placing RTKN in MEG3/miR-145-5p/Wnt/β-catenin axis, single lab","pmids":["33602903"],"is_preprint":false}],"current_model":"RTKN (Rhotekin) promotes cell proliferation and survival downstream of Rho GTPase signaling, acting as an oncogene in multiple cancer contexts; it is post-transcriptionally repressed by miR-145, miR-152, and let-7a through direct 3'UTR binding, and functions upstream of NF-κB signaling (in HCC) and the Wnt/β-catenin pathway (in kidney injury), where its upregulation drives proliferation, inhibits apoptosis, and promotes mitophagy."},"narrative":{"mechanistic_narrative":"RTKN (Rhotekin) functions as a growth-promoting effector that drives proliferation and suppresses apoptosis across multiple cell contexts, behaving as an oncogene in hepatocellular carcinoma where its overexpression promotes proliferation and blocks apoptosis while its silencing imposes G2/M arrest through NF-κB signaling [PMID:27922690]. A recurrent theme is post-transcriptional repression of RTKN by microRNAs that bind its 3'UTR: miR-145 represses RTKN to limit breast cancer cell growth [PMID:19360360], let-7a downregulates RTKN to restrain colon cancer growth and metastasis, with RTKN re-expression rescuing this inhibition [PMID:27498032], and miR-152 targets the RTKN 3'UTR to reverse RTKN-driven HCC growth [PMID:27922690]. In kidney ischemia-reperfusion injury, RTKN is de-repressed when the lncRNA MEG3 sequesters miR-145-5p, and the resulting RTKN upregulation activates Wnt/β-catenin signaling to promote mitophagy and apoptosis [PMID:33602903]. Beyond these miRNA-regulated proliferative and survival roles, the direct molecular activity, structure, and physical effectors of RTKN have not been characterized in the available corpus.","teleology":[{"year":2009,"claim":"Establishing that RTKN is a direct target of a growth-suppressive microRNA connected its expression level to a proliferative phenotype.","evidence":"Luciferase 3'UTR reporter, siRNA knockdown, Western blot and RT-PCR in MCF-7 breast cancer cells","pmids":["19360360"],"confidence":"Medium","gaps":["molecular activity of RTKN downstream of miR-145 not defined","no direct binding partners or effectors identified","single cell line and single lab"]},{"year":2016,"claim":"Gain- and loss-of-function defined RTKN as an oncogene acting through NF-κB and cell-cycle control, and identified a second repressive microRNA.","evidence":"Overexpression/knockdown in HepG2/Hep3B cells, flow cytometry for apoptosis and cell cycle, miR-152 3'UTR reporter assay","pmids":["27922690"],"confidence":"Medium","gaps":["mechanism linking RTKN to NF-κB activation not resolved","no biochemical demonstration of how RTKN engages the pathway"]},{"year":2016,"claim":"A rescue experiment placed RTKN epistatically downstream of let-7a, showing RTKN is the functionally relevant target driving growth and metastasis.","evidence":"let-7a mimic transfection with RTKN re-introduction, growth and metastasis assays in HCT-116 and SW620 colon cancer cells","pmids":["27498032"],"confidence":"Medium","gaps":["metastasis-promoting mechanism of RTKN not defined","downstream signaling in colon cancer not mapped"]},{"year":2021,"claim":"Embedding RTKN in a MEG3/miR-145-5p axis showed it activates Wnt/β-catenin signaling to drive mitophagy and apoptosis in a non-cancer injury context.","evidence":"RNA pulldown and reporter assays, siRNA knockdown, Wnt/β-catenin pathway readouts, in vivo kidney ischemia-reperfusion mouse model in HK-2 cells","pmids":["33602903"],"confidence":"Medium","gaps":["direct mechanism by which RTKN activates Wnt/β-catenin not established","molecular link to mitophagy machinery unknown"]},{"year":null,"claim":"The intrinsic molecular activity of RTKN and its direct protein partners remain undefined in this corpus, leaving open how it transduces signals to NF-κB and Wnt/β-catenin.","evidence":"","pmids":[],"confidence":"Medium","gaps":["no biochemical activity or direct binding partners characterized","no structural data","context-dependence (oncogenic vs injury-promoting) not mechanistically reconciled"]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BST9","full_name":"Rhotekin","aliases":[],"length_aa":563,"mass_kda":62.7,"function":"Mediates Rho signaling to activate NF-kappa-B and may confer increased resistance to apoptosis to cells in gastric tumorigenesis. May play a novel role in the organization of septin structures","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9BST9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RTKN","classification":"Not Classified","n_dependent_lines":28,"n_total_lines":1208,"dependency_fraction":0.023178807947019868},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RTKN","total_profiled":1310},"omim":[{"mim_id":"618450","title":"RHOTEKIN 2; RTKN2","url":"https://www.omim.org/entry/618450"},{"mim_id":"616484","title":"TAX1-BINDING PROTEIN 3; TAX1BP3","url":"https://www.omim.org/entry/616484"},{"mim_id":"612331","title":"LIN7 HOMOLOG B, CRUMBS CELL POLARITY COMPLEX COMPONENT; LIN7B","url":"https://www.omim.org/entry/612331"},{"mim_id":"605477","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 7; ARHGEF7","url":"https://www.omim.org/entry/605477"},{"mim_id":"602288","title":"RHOTEKIN; RTKN","url":"https://www.omim.org/entry/602288"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":114.0},{"tissue":"liver","ntpm":120.9}],"url":"https://www.proteinatlas.org/search/RTKN"},"hgnc":{"alias_symbol":["B5","RTKN-1"],"prev_symbol":[]},"alphafold":{"accession":"Q9BST9","domains":[{"cath_id":"-","chopping":"19-90","consensus_level":"medium","plddt":83.9721,"start":19,"end":90},{"cath_id":"2.60.40.150","chopping":"117-202_252-305","consensus_level":"medium","plddt":90.6924,"start":117,"end":305},{"cath_id":"2.30.29.30","chopping":"310-426","consensus_level":"high","plddt":87.4847,"start":310,"end":426}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BST9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BST9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BST9-F1-predicted_aligned_error_v6.png","plddt_mean":72.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RTKN","jax_strain_url":"https://www.jax.org/strain/search?query=RTKN"},"sequence":{"accession":"Q9BST9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BST9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BST9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BST9"}},"corpus_meta":[{"pmid":"9452426","id":"PMC_9452426","title":"Cytochrome 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coxsackievirus B5.","date":"2017","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29339251","citation_count":30,"is_preprint":false},{"pmid":"27498032","id":"PMC_27498032","title":"Let-7a inhibits tumor cell growth and metastasis by directly targeting RTKN in human colon cancer.","date":"2016","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/27498032","citation_count":29,"is_preprint":false},{"pmid":"8049375","id":"PMC_8049375","title":"Tobacco cytochrome b5: cDNA isolation, expression analysis and in vitro protein targeting.","date":"1994","source":"Plant molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8049375","citation_count":28,"is_preprint":false},{"pmid":"11897703","id":"PMC_11897703","title":"Adrenocortical cytochrome b5 expression during fetal development of the rhesus 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/37482959","citation_count":27,"is_preprint":false},{"pmid":"1369012","id":"PMC_1369012","title":"Gene-dose-dependent expression of soluble mammalian cytochrome b5 in Escherichia coli.","date":"1992","source":"Applied microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/1369012","citation_count":27,"is_preprint":false},{"pmid":"2159330","id":"PMC_2159330","title":"Direct electrochemistry of protein-protein complexes involving cytochrome c, cytochrome b5, and plastocyanin.","date":"1990","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/2159330","citation_count":26,"is_preprint":false},{"pmid":"25446886","id":"PMC_25446886","title":"Cytochrome b5 modulates multiple reactions in steroidogenesis by diverse mechanisms.","date":"2014","source":"The Journal of steroid biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/25446886","citation_count":25,"is_preprint":false},{"pmid":"24078287","id":"PMC_24078287","title":"Regulation of cytochrome b5 expression by miR-223 in human liver: effects on cytochrome P450 activities.","date":"2014","source":"Pharmaceutical research","url":"https://pubmed.ncbi.nlm.nih.gov/24078287","citation_count":25,"is_preprint":false},{"pmid":"17040106","id":"PMC_17040106","title":"Reductive detoxification of arylhydroxylamine carcinogens by human NADH cytochrome b5 reductase and cytochrome b5.","date":"2006","source":"Chemical research in toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/17040106","citation_count":25,"is_preprint":false},{"pmid":"9602031","id":"PMC_9602031","title":"Electrostatic interaction between NADH-cytochrome b5 reductase and cytochrome b5 studied by site-directed mutagenesis.","date":"1998","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/9602031","citation_count":25,"is_preprint":false},{"pmid":"38942195","id":"PMC_38942195","title":"Development of a vitamin B5 hyperproducer in Escherichia coli by multiple metabolic engineering.","date":"2024","source":"Metabolic engineering","url":"https://pubmed.ncbi.nlm.nih.gov/38942195","citation_count":24,"is_preprint":false},{"pmid":"7986089","id":"PMC_7986089","title":"Fractionation of liver microsomes with polyethylene glycol and purification of NADH-cytochrome b5 oxidoreductase and cytochrome b5.","date":"1994","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/7986089","citation_count":24,"is_preprint":false},{"pmid":"22792238","id":"PMC_22792238","title":"Cytochrome b5 and cytokeratin 17 are biomarkers in bronchoalveolar fluid signifying onset of acute lung injury.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22792238","citation_count":24,"is_preprint":false},{"pmid":"16571104","id":"PMC_16571104","title":"Dihydroceramide:sphinganine C-4-hydroxylation requires Des2 hydroxylase and the membrane form of cytochrome b5.","date":"2006","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/16571104","citation_count":24,"is_preprint":false},{"pmid":"15802225","id":"PMC_15802225","title":"High level expression of peptides and proteins using cytochrome b5 as a fusion host.","date":"2005","source":"Protein expression and purification","url":"https://pubmed.ncbi.nlm.nih.gov/15802225","citation_count":23,"is_preprint":false},{"pmid":"8439576","id":"PMC_8439576","title":"Differential expression of the mRNAs for the soluble and membrane-bound forms of rabbit cytochrome b5.","date":"1993","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/8439576","citation_count":23,"is_preprint":false},{"pmid":"25144769","id":"PMC_25144769","title":"The N-reductive system composed of mitochondrial amidoxime reducing component (mARC), cytochrome b5 (CYB5B) and cytochrome b5 reductase (CYB5R) is regulated by fasting and high fat diet in mice.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25144769","citation_count":23,"is_preprint":false},{"pmid":"36210178","id":"PMC_36210178","title":"Microbial production of vitamin B5: current status and prospects.","date":"2022","source":"Critical reviews in biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/36210178","citation_count":20,"is_preprint":false},{"pmid":"7945268","id":"PMC_7945268","title":"Expression of a biologically active plant cytochrome b5 in Escherichia coli.","date":"1994","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/7945268","citation_count":20,"is_preprint":false},{"pmid":"15379561","id":"PMC_15379561","title":"A relationship between heme binding and protein stability in cytochrome b5.","date":"2004","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15379561","citation_count":20,"is_preprint":false},{"pmid":"26403427","id":"PMC_26403427","title":"Vitamin B5 and N-Acetylcysteine in Nonalcoholic Steatohepatitis: A Preclinical Study in a Dietary Mouse Model.","date":"2015","source":"Digestive diseases and sciences","url":"https://pubmed.ncbi.nlm.nih.gov/26403427","citation_count":20,"is_preprint":false},{"pmid":"31497217","id":"PMC_31497217","title":"Vitamin B5 inhibit RANKL induced osteoclastogenesis and ovariectomy induced osteoporosis by scavenging ROS generation.","date":"2019","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/31497217","citation_count":20,"is_preprint":false},{"pmid":"9760250","id":"PMC_9760250","title":"The influence of mutation at Glu44 and Glu56 of cytochrome b5 on the protein's stabilization and interaction between cytochrome c and cytochrome b5.","date":"1998","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9760250","citation_count":20,"is_preprint":false},{"pmid":"37154424","id":"PMC_37154424","title":"Metabolic Engineering of Saccharomyces cerevisiae for Vitamin B5 Production.","date":"2023","source":"Journal of agricultural and food chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/37154424","citation_count":19,"is_preprint":false},{"pmid":"24297440","id":"PMC_24297440","title":"Giardia intestinalis incorporates heme into cytosolic cytochrome b₅.","date":"2013","source":"Eukaryotic cell","url":"https://pubmed.ncbi.nlm.nih.gov/24297440","citation_count":19,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50831,"output_tokens":1502,"usd":0.087512,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7821,"output_tokens":1702,"usd":0.040828,"stage2_stop_reason":"end_turn"},"total_usd":0.12834,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about RTKN (Rhotekin). The vast majority of papers are about cytochrome b5, vitamin B5, coxsackievirus B5, or other unrelated \"B5\" entities. I need to find papers specifically about RTKN/Rhotekin.\n\nRelevant papers about RTKN:\n- PMID 19360360: miR-145 targets RTKN 3'UTR, RTKN knockdown inhibits MCF-7 growth\n- PMID 33602903: MEG3/miR-145-5p/RTKN/Wnt/β-catenin axis in kidney IRI\n- PMID 30551459: RETRACTED - excluded\n- PMID 27922690: RTKN as oncogene in HCC; miR-152 targets RTKN; RTKN promotes proliferation/inhibits apoptosis; NF-κB signaling\n- PMID 27498032: let-7a targets RTKN in colon cancer\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"RTKN is a direct target of miR-145: the miR-145 binding site was experimentally confirmed in the RTKN 3'UTR using reporter constructs, and overexpression of miR-145 reduced RTKN protein and mRNA levels in MCF-7 cells. siRNA-mediated knockdown of RTKN phenocopied miR-145 overexpression by inhibiting MCF-7 cell growth.\",\n      \"method\": \"Luciferase reporter assay (3'UTR), siRNA knockdown, Western blot, RT-PCR\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay confirms direct 3'UTR binding, siRNA KD with defined proliferation phenotype, single lab with two orthogonal methods\",\n      \"pmids\": [\"19360360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RTKN functions as an oncogene in hepatocellular carcinoma: overexpression promotes proliferation and inhibits apoptosis, while silencing has the opposite effect. The growth-promoting effect of RTKN operates through NF-κB signaling and G2/M phase arrest when inhibited. RTKN is a direct target of miR-152, which reverses RTKN-driven HCC cell growth.\",\n      \"method\": \"Overexpression and siRNA knockdown in HepG2/Hep3B cells, flow cytometry (apoptosis/cell cycle), luciferase reporter assay for miR-152 targeting of RTKN 3'UTR\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with defined cellular phenotypes plus reporter assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"27922690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RTKN is a direct target of let-7a in colon cancer: let-7a overexpression inhibits colon cancer cell growth and metastasis by directly downregulating RTKN, and re-introduction of RTKN into let-7a-overexpressing cells rescues the inhibitory phenotype.\",\n      \"method\": \"let-7a mimic transfection, RTKN rescue experiment, cell growth and metastasis assays in HCT-116 and SW620 cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rescue experiment establishes epistatic relationship between let-7a and RTKN in growth/metastasis, single lab\",\n      \"pmids\": [\"27498032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RTKN acts downstream of miR-145-5p and upstream of the Wnt/β-catenin pathway in kidney ischemia-reperfusion injury: the lncRNA MEG3 sequesters miR-145-5p to upregulate RTKN, which in turn activates Wnt/β-catenin signaling and promotes mitophagy and apoptosis in HK-2 cells. c-MYC transcriptionally activates MEG3, forming a positive feedback loop.\",\n      \"method\": \"RNA pulldown/luciferase reporter for MEG3-miR-145-5p interaction; luciferase reporter and Western blot for miR-145-5p targeting of RTKN 3'UTR; siRNA knockdown of MEG3/RTKN; Wnt/β-catenin pathway readouts; in vivo IRI mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, KD, pathway readouts, in vivo model) placing RTKN in MEG3/miR-145-5p/Wnt/β-catenin axis, single lab\",\n      \"pmids\": [\"33602903\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RTKN (Rhotekin) promotes cell proliferation and survival downstream of Rho GTPase signaling, acting as an oncogene in multiple cancer contexts; it is post-transcriptionally repressed by miR-145, miR-152, and let-7a through direct 3'UTR binding, and functions upstream of NF-κB signaling (in HCC) and the Wnt/β-catenin pathway (in kidney injury), where its upregulation drives proliferation, inhibits apoptosis, and promotes mitophagy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RTKN (Rhotekin) functions as a growth-promoting effector that drives proliferation and suppresses apoptosis across multiple cell contexts, behaving as an oncogene in hepatocellular carcinoma where its overexpression promotes proliferation and blocks apoptosis while its silencing imposes G2/M arrest through NF-\\u03baB signaling [#1]. A recurrent theme is post-transcriptional repression of RTKN by microRNAs that bind its 3'UTR: miR-145 represses RTKN to limit breast cancer cell growth [#0], let-7a downregulates RTKN to restrain colon cancer growth and metastasis, with RTKN re-expression rescuing this inhibition [#2], and miR-152 targets the RTKN 3'UTR to reverse RTKN-driven HCC growth [#1]. In kidney ischemia-reperfusion injury, RTKN is de-repressed when the lncRNA MEG3 sequesters miR-145-5p, and the resulting RTKN upregulation activates Wnt/\\u03b2-catenin signaling to promote mitophagy and apoptosis [#3]. Beyond these miRNA-regulated proliferative and survival roles, the direct molecular activity, structure, and physical effectors of RTKN have not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that RTKN is a direct target of a growth-suppressive microRNA connected its expression level to a proliferative phenotype.\",\n      \"evidence\": \"Luciferase 3'UTR reporter, siRNA knockdown, Western blot and RT-PCR in MCF-7 breast cancer cells\",\n      \"pmids\": [\n        \"19360360\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"molecular activity of RTKN downstream of miR-145 not defined\",\n        \"no direct binding partners or effectors identified\",\n        \"single cell line and single lab\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Gain- and loss-of-function defined RTKN as an oncogene acting through NF-\\u03baB and cell-cycle control, and identified a second repressive microRNA.\",\n      \"evidence\": \"Overexpression/knockdown in HepG2/Hep3B cells, flow cytometry for apoptosis and cell cycle, miR-152 3'UTR reporter assay\",\n      \"pmids\": [\n        \"27922690\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"mechanism linking RTKN to NF-\\u03baB activation not resolved\",\n        \"no biochemical demonstration of how RTKN engages the pathway\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A rescue experiment placed RTKN epistatically downstream of let-7a, showing RTKN is the functionally relevant target driving growth and metastasis.\",\n      \"evidence\": \"let-7a mimic transfection with RTKN re-introduction, growth and metastasis assays in HCT-116 and SW620 colon cancer cells\",\n      \"pmids\": [\n        \"27498032\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"metastasis-promoting mechanism of RTKN not defined\",\n        \"downstream signaling in colon cancer not mapped\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Embedding RTKN in a MEG3/miR-145-5p axis showed it activates Wnt/\\u03b2-catenin signaling to drive mitophagy and apoptosis in a non-cancer injury context.\",\n      \"evidence\": \"RNA pulldown and reporter assays, siRNA knockdown, Wnt/\\u03b2-catenin pathway readouts, in vivo kidney ischemia-reperfusion mouse model in HK-2 cells\",\n      \"pmids\": [\n        \"33602903\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"direct mechanism by which RTKN activates Wnt/\\u03b2-catenin not established\",\n        \"molecular link to mitophagy machinery unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The intrinsic molecular activity of RTKN and its direct protein partners remain undefined in this corpus, leaving open how it transduces signals to NF-\\u03baB and Wnt/\\u03b2-catenin.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"no biochemical activity or direct binding partners characterized\",\n        \"no structural data\",\n        \"context-dependence (oncogenic vs injury-promoting) not mechanistically reconciled\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":3,"faith_total":3,"faith_pct":100.0}}