{"gene":"RPRM","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":2000,"finding":"RPRM (Reprimo) is a p53-dependent gene that, when ectopically expressed, localizes to the cytoplasm and induces G2 cell cycle arrest by inhibiting Cdc2 kinase activity and blocking nuclear translocation of cyclin B1, placing RPRM in the Cdc2·cyclin B1 regulation pathway downstream of p53.","method":"Ectopic expression, cell cycle analysis, Cdc2 activity assay, subcellular fractionation/localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — original discovery paper with multiple orthogonal methods (ectopic expression, kinase assay, localization), >166 citations, widely replicated in concept","pmids":["10930422"],"is_preprint":false},{"year":2009,"finding":"Estrogen repression of RPRM requires a tripartite interaction among estrogen receptor α (ERα), histone deacetylase 7 (HDAC7), and the chromatin pioneer factor FoxA1. HDAC7 binds ERα and represses its transcriptional activity (independently of HDAC7 deacetylase activity), while FoxA1 is recruited to the RPRM promoter (characterized by H3K4me1/me2 marks). Estrogen treatment causes decreases in H3K4me1/me2 and release of RNA Pol II from the proximal RPRM promoter.","method":"ChIP, co-immunoprecipitation, siRNA knockdown, promoter reporter assays, HDAC7 deacetylase-dead mutant","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including Co-IP, ChIP, mutagenesis of HDAC7, and siRNA in a single rigorous study","pmids":["19917725"],"is_preprint":false},{"year":2012,"finding":"In pituitary cells, RPRM protein is rapidly degraded via ubiquitination and proteasomal targeting under normal conditions, but cellular stress (growth factor withdrawal) stabilizes RPRM protein levels, indicating post-translational regulation of RPRM abundance.","method":"Stable overexpression, proteasome inhibitor treatment, ubiquitination assay, growth factor withdrawal","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical demonstration of ubiquitin-proteasome degradation, single lab study","pmids":["22562171"],"is_preprint":false},{"year":2012,"finding":"RPRM overexpression in pituitary tumor cell lines (LβT2 and GH3) decreases cell proliferation and increases apoptosis in response to growth factor deprivation (assessed by caspase-3 cleavage and nuclear condensation), and suppresses colony formation, supporting a tumor suppressor role that is independent of G2/M cell cycle effects in this context.","method":"Stable overexpression, proliferation assay, caspase-3 cleavage, clonogenic assay, nuclear condensation","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO/OE with defined cellular phenotype and multiple readouts, single lab","pmids":["22562171"],"is_preprint":false},{"year":2016,"finding":"RPRM overexpression in MDA-MB-231 breast cancer cells decreases cell migration, wound healing, and invasion in vitro without altering cell viability, apoptosis (phosphatidylserine translocation), or G2/M cell cycle transition, demonstrating a specific role for RPRM in regulating cell migration and invasion.","method":"Ectopic overexpression, transwell migration/invasion assay, wound healing assay, flow cytometry","journal":"Biological research","confidence":"Medium","confidence_rationale":"Tier 2 — defined cellular phenotype with multiple migration/invasion assays, single lab","pmids":["26796959"],"is_preprint":false},{"year":2022,"finding":"RPRM translocates from the cytoplasm to the nucleus after X-irradiation, interacts with ATM, and promotes ATM nuclear export and proteasomal degradation, thereby negatively regulating ATM protein levels and impairing DNA repair. RPRM nuclear translocation requires phosphorylation at serine 98 by CDK4/6 and is dependent on Importin-11 (IPO11).","method":"Co-immunoprecipitation, subcellular fractionation, phosphorylation site mutagenesis, siRNA knockdown of CDK4/6 and IPO11, proteasome inhibitor experiments, in vitro and in vivo irradiation models","journal":"iScience","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including Co-IP, mutagenesis, nuclear translocation assay, functional rescue, in vivo validation","pmids":["36185355"],"is_preprint":false},{"year":2022,"finding":"RPRM deletion in mice preserves hematopoietic stem cell (HSC) regeneration after ionizing radiation by increasing EGFR expression and phosphorylation in HSCs, which activates STAT3 and DNA-PKcs to promote DNA repair and HSC proliferation.","method":"RPRM knockout mouse model, flow cytometry, EGFR/STAT3/DNA-PKcs pathway analysis, irradiation model","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined pathway (EGFR-STAT3-DNA-PKcs) and cellular phenotype, single lab","pmids":["36041213"],"is_preprint":false},{"year":2024,"finding":"RPRM binds to CREB and promotes its degradation after ionizing radiation, reducing CREB protein levels and thereby downregulating Nrf2 and SCD1, which leads to neuronal ferroptosis via iron accumulation and lipid peroxidation. RPRM deletion restores CREB-Nrf2/SCD1 signaling and protects neurons against radiation-induced ferroptosis.","method":"Co-immunoprecipitation (RPRM-CREB interaction), RPRM knockout mouse model, western blot, lipid peroxidation assay, mitochondrial morphology EM, GPX4/SCD1/Nrf2 measurements, primary neuron culture","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 1-2 — Co-IP for binding, KO mouse model, multiple pathway readouts, in vitro and in vivo validation in single study","pmids":["38272326"],"is_preprint":false},{"year":2025,"finding":"Reprimo protein is secreted extracellularly and extrinsically induces apoptosis in recipient cells. FAT1, FAT4, CELSR1, CELSR2, and CELSR3 (protocadherin family members) were identified as cell-surface receptors for secreted Reprimo. Reprimo acts upstream of the Hippo-YAP/TAZ-p73 axis to transactivate proapoptotic genes, defining a p53-Reprimo-protocadherin-Hippo-YAP/TAZ-p73 extrinsic apoptosis pathway.","method":"Secretion assay, receptor identification (binding/pulldown), co-immunoprecipitation, epistasis analysis, YAP/TAZ reporter assay, in vivo tumor suppression models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — receptor identification, epistasis, secretion assay, in vivo validation, multiple orthogonal methods in single study","pmids":["39913207"],"is_preprint":false},{"year":2022,"finding":"LINC00467 promotes methylation and silencing of the RPRM promoter in gastric cancer cells by recruiting DNA methyltransferase 1 (DNMT1) to the RPRM promoter region.","method":"RNA immunoprecipitation, ChIP for DNMT1 at RPRM promoter, bisulfite sequencing, LINC00467 knockdown/overexpression","journal":"Bioengineered","confidence":"Medium","confidence_rationale":"Tier 2 — direct demonstration of DNMT1 recruitment by ChIP and RIP, single lab","pmids":["35549646"],"is_preprint":false},{"year":2025,"finding":"ERα signaling in Rprm-lineage cells in the mediobasal hypothalamus regulates thermoregulation in female mice; selective knockout of ERα in Rprm-expressing cells (RERKO) alters core temperature, brown adipose tissue temperature, and tail temperature in a sex-specific manner, mediated by the nervous system rather than adipose tissue directly.","method":"Conditional knockout (ReprimoCre mouse), in vivo temperature measurement, BAT mass quantification, cell ablation in mediobasal hypothalamus","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic conditional KO with defined physiological phenotype, supported by cell ablation experiment, single lab","pmids":["41315012"],"is_preprint":false}],"current_model":"RPRM (Reprimo) is a p53-target gene encoding a cytoplasmic, highly glycosylated protein that acts as a tumor suppressor through multiple mechanisms: it induces G2/M cell cycle arrest by inhibiting Cdc2·cyclin B1 complex activity and nuclear translocation; it is secreted extracellularly to bind protocadherin family receptors (FAT1, FAT4, CELSR1-3) and activate the Hippo-YAP/TAZ-p73 apoptosis axis in neighboring cells; it translocates to the nucleus upon CDK4/6-mediated phosphorylation (Ser98) via IPO11 to promote ATM proteasomal degradation and sensitize cells to DNA damage; it binds CREB and promotes its degradation after irradiation, reducing Nrf2/SCD1 and causing neuronal ferroptosis; and its transcription is epigenetically repressed by promoter hypermethylation (recruited via LINC00467-DNMT1) or by estrogen through an ERα-HDAC7-FoxA1 tripartite complex, while RPRM protein stability is itself regulated by ubiquitin-proteasomal degradation under basal conditions."},"narrative":{"teleology":[{"year":2000,"claim":"The discovery that RPRM is a p53 target gene that arrests cells at G2 by inhibiting Cdc2 activity and blocking cyclin B1 nuclear translocation established RPRM as a downstream effector of p53 in cell cycle control.","evidence":"Ectopic expression with cell cycle analysis, Cdc2 kinase assay, and subcellular fractionation in human cell lines","pmids":["10930422"],"confidence":"High","gaps":["Endogenous RPRM loss-of-function not tested","Direct binding to Cdc2/cyclin B1 not demonstrated","Mechanism of Cdc2 inhibition (direct vs. indirect) unresolved"]},{"year":2009,"claim":"Identification of a tripartite ERα–HDAC7–FoxA1 complex that represses RPRM transcription upon estrogen signaling revealed an epigenetic mechanism for silencing this tumor suppressor in hormone-responsive contexts.","evidence":"ChIP, co-immunoprecipitation, siRNA knockdown, and HDAC7 deacetylase-dead mutant in breast cancer cells","pmids":["19917725"],"confidence":"High","gaps":["Whether estrogen-mediated RPRM silencing contributes to breast tumorigenesis in vivo","Role of HDAC7 catalytic-independent repression mechanism unclear"]},{"year":2012,"claim":"Demonstration that RPRM protein is constitutively degraded via ubiquitin-proteasome pathway and stabilized by stress, coupled with evidence that RPRM overexpression suppresses proliferation and promotes apoptosis in pituitary cells, established post-translational control of RPRM abundance and broadened its tumor suppressor function beyond G2 arrest.","evidence":"Proteasome inhibitor treatment, ubiquitination assay, caspase-3 cleavage, and clonogenic assay in pituitary tumor cell lines","pmids":["22562171"],"confidence":"Medium","gaps":["E3 ubiquitin ligase for RPRM not identified","Whether apoptosis induction requires the same pathway as G2 arrest unresolved"]},{"year":2016,"claim":"Finding that RPRM overexpression specifically suppresses cell migration and invasion without affecting viability or cell cycle in breast cancer cells expanded RPRM's functional repertoire to motility regulation.","evidence":"Transwell migration/invasion assays, wound healing assay, and flow cytometry in MDA-MB-231 cells","pmids":["26796959"],"confidence":"Medium","gaps":["Molecular targets mediating anti-migratory effect not identified","No in vivo metastasis model tested"]},{"year":2022,"claim":"Three independent studies in 2022 revealed: (1) RPRM undergoes CDK4/6-dependent Ser98 phosphorylation and IPO11-mediated nuclear translocation to promote ATM degradation after irradiation; (2) RPRM deletion protects hematopoietic stem cells from radiation via EGFR–STAT3–DNA-PKcs upregulation; and (3) LINC00467 recruits DNMT1 to methylate the RPRM promoter in gastric cancer. These collectively established RPRM as a central modulator of DNA damage responses and clarified epigenetic silencing mechanisms.","evidence":"Co-IP, phospho-site mutagenesis, IPO11 knockdown, proteasome inhibitors, RPRM KO mouse irradiation model, RIP/ChIP for DNMT1 at RPRM promoter","pmids":["36185355","36041213","35549646"],"confidence":"High","gaps":["Crystal structure of RPRM–ATM interaction unknown","Whether CDK4/6 phosphorylation regulates functions beyond nuclear import unclear","LINC00467–DNMT1 mechanism validated in a single cancer type"]},{"year":2024,"claim":"Identification of CREB as a direct RPRM-binding partner whose degradation after irradiation suppresses Nrf2/SCD1 and triggers neuronal ferroptosis linked RPRM to a non-apoptotic cell death pathway in the nervous system.","evidence":"Co-immunoprecipitation of RPRM–CREB, RPRM KO mouse, lipid peroxidation assay, primary neuron culture","pmids":["38272326"],"confidence":"High","gaps":["Whether RPRM-CREB interaction is direct or scaffolded not established","Ferroptosis relevance beyond radiation-induced injury untested"]},{"year":2025,"claim":"Discovery that RPRM is secreted and engages protocadherin receptors (FAT1, FAT4, CELSR1–3) to activate the Hippo-YAP/TAZ-p73 apoptosis axis fundamentally recast RPRM as a non-cell-autonomous tumor suppressor ligand, defining a complete p53–Reprimo–protocadherin–Hippo–p73 extrinsic signaling pathway.","evidence":"Secretion assay, receptor identification by pulldown, epistasis analysis, YAP/TAZ reporter, in vivo tumor models","pmids":["39913207"],"confidence":"High","gaps":["Structural basis of RPRM–protocadherin binding unknown","Relative contribution of cell-autonomous vs. secreted RPRM to tumor suppression in vivo unresolved"]},{"year":2025,"claim":"Conditional ERα knockout in Rprm-lineage hypothalamic neurons revealed a sex-specific role for these cells in thermoregulation, extending RPRM biology to neuroendocrine physiology.","evidence":"ReprimoCre conditional knockout mouse, core/BAT/tail temperature measurements, cell ablation in mediobasal hypothalamus","pmids":["41315012"],"confidence":"Medium","gaps":["Whether RPRM protein itself has a functional role in thermoregulation or merely marks a neuronal population is unresolved","Downstream effectors of ERα in Rprm neurons not identified"]},{"year":null,"claim":"Key unresolved questions include: the identity of the E3 ligase(s) mediating RPRM ubiquitin-proteasomal turnover; the structural basis of RPRM interactions with ATM, CREB, and protocadherin receptors; and whether the cell-autonomous (G2 arrest, ATM degradation) and non-cell-autonomous (secreted ligand) functions are independently regulated or coordinated in vivo.","evidence":"","pmids":[],"confidence":"Low","gaps":["E3 ligase for RPRM degradation unidentified","No structural data for RPRM or its complexes","In vivo partitioning between intracellular and secreted RPRM functions unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5,7]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[8]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,7,8]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8]}],"complexes":[],"partners":["ATM","CREB","FAT1","FAT4","CELSR1","IPO11","HDAC7","FOXA1"],"other_free_text":[]},"mechanistic_narrative":"RPRM (Reprimo) is a p53-induced tumor suppressor that operates through both cell-autonomous and non-cell-autonomous mechanisms to control cell cycle progression, apoptosis, DNA damage responses, and cell migration. In its cell-autonomous role, RPRM localizes to the cytoplasm and induces G2 arrest by inhibiting Cdc2 kinase activity and blocking nuclear translocation of cyclin B1 [PMID:10930422]; upon irradiation, CDK4/6 phosphorylates RPRM at Ser98, enabling IPO11-dependent nuclear import where RPRM binds ATM and promotes its proteasomal degradation, thereby modulating DNA repair [PMID:36185355]. RPRM also binds CREB and promotes its degradation after irradiation, reducing Nrf2/SCD1 signaling and triggering neuronal ferroptosis [PMID:38272326]. In its non-cell-autonomous role, RPRM is secreted and engages protocadherin family receptors (FAT1, FAT4, CELSR1–3) on neighboring cells to activate the Hippo-YAP/TAZ-p73 extrinsic apoptosis pathway [PMID:39913207]."},"prefetch_data":{"uniprot":{"accession":"Q9NS64","full_name":"Protein reprimo","aliases":[],"length_aa":109,"mass_kda":11.8,"function":"May be involved in the regulation of p53-dependent G2 arrest of the cell cycle. Seems to induce cell cycle arrest by inhibiting CDK1 activity and nuclear translocation of the CDC2 cyclin B1 complex (By similarity)","subcellular_location":"Cytoplasm; Membrane","url":"https://www.uniprot.org/uniprotkb/Q9NS64/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RPRM","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RPRM","total_profiled":1310},"omim":[{"mim_id":"612171","title":"REPRIMO; RPRM","url":"https://www.omim.org/entry/612171"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPRM"},"hgnc":{"alias_symbol":["FLJ90327","REPRIMO"],"prev_symbol":[]},"alphafold":{"accession":"Q9NS64","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NS64","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NS64-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NS64-F1-predicted_aligned_error_v6.png","plddt_mean":60.84},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPRM","jax_strain_url":"https://www.jax.org/strain/search?query=RPRM"},"sequence":{"accession":"Q9NS64","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NS64.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NS64/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NS64"}},"corpus_meta":[{"pmid":"10930422","id":"PMC_10930422","title":"Reprimo, a new candidate mediator of the p53-mediated cell cycle arrest at the G2 phase.","date":"2000","source":"The Journal of 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Reprimo and hMLH1 gene methylation in early diagnosis of gastric carcinoma.","date":"2015","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26823831","citation_count":23,"is_preprint":false},{"pmid":"31692031","id":"PMC_31692031","title":"Molecular chaperone HspB2 inhibited pancreatic cancer cell proliferation via activating p53 downstream gene RPRM, BAI1, and TSAP6.","date":"2019","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31692031","citation_count":23,"is_preprint":false},{"pmid":"33322837","id":"PMC_33322837","title":"The Reprimo-Like Gene Is an Epigenetic-Mediated Tumor Suppressor and a Candidate Biomarker for the Non-Invasive Detection of Gastric Cancer.","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33322837","citation_count":18,"is_preprint":false},{"pmid":"27432065","id":"PMC_27432065","title":"Evolutionary history of the reprimo tumor suppressor gene family in vertebrates with a description of a new reprimo gene lineage.","date":"2016","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/27432065","citation_count":18,"is_preprint":false},{"pmid":"26796959","id":"PMC_26796959","title":"Reprimo as a modulator of cell migration and invasion in the MDA-MB-231 breast cancer cell line.","date":"2016","source":"Biological research","url":"https://pubmed.ncbi.nlm.nih.gov/26796959","citation_count":17,"is_preprint":false},{"pmid":"32431794","id":"PMC_32431794","title":"Methylation Analysis of P16, RASSF1A, RPRM, and RUNX3 in Circulating Cell-Free DNA for Detection of Gastric Cancer: A Validation Study.","date":"2020","source":"Avicenna journal of medical biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/32431794","citation_count":17,"is_preprint":false},{"pmid":"29941787","id":"PMC_29941787","title":"The Reprimo Gene Family: A Novel Gene Lineage in Gastric Cancer with Tumor Suppressive 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oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40849852","citation_count":1,"is_preprint":false},{"pmid":"41315012","id":"PMC_41315012","title":"Sex-Specific Thermoregulatory Effects of Estrogen Signaling in Reprimo Lineage Cells.","date":"2025","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/41315012","citation_count":1,"is_preprint":false},{"pmid":"12395409","id":"PMC_12395409","title":"Identification of polymorphisms in the human Reprimo gene using public EST data.","date":"2002","source":"Teratogenesis, carcinogenesis, and mutagenesis","url":"https://pubmed.ncbi.nlm.nih.gov/12395409","citation_count":1,"is_preprint":false},{"pmid":"41036848","id":"PMC_41036848","title":"Reprimo (RPRM): A Tumor Suppressor That Induces Extrinsic Apoptosis via YAP Signaling.","date":"2025","source":"Cancer science","url":"https://pubmed.ncbi.nlm.nih.gov/41036848","citation_count":0,"is_preprint":false},{"pmid":"39677630","id":"PMC_39677630","title":"Sex-specific thermoregulatory effects of estrogen signaling in Reprimo lineage cells.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39677630","citation_count":0,"is_preprint":false},{"pmid":"32111873","id":"PMC_32111873","title":"Author Correction: The Reprimo gene family member, reprimo-like (rprml), is required for blood development in embryonic zebrafish.","date":"2020","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/32111873","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.12.02.626488","title":"Sex-specific thermoregulatory effects of estrogen signaling in <i>Reprimo</i> lineage cells","date":"2024-12-03","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.02.626488","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":23129,"output_tokens":2931,"usd":0.056676},"stage2":{"model":"claude-opus-4-6","input_tokens":6301,"output_tokens":2533,"usd":0.142245},"total_usd":0.198921,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"RPRM (Reprimo) is a p53-dependent gene that, when ectopically expressed, localizes to the cytoplasm and induces G2 cell cycle arrest by inhibiting Cdc2 kinase activity and blocking nuclear translocation of cyclin B1, placing RPRM in the Cdc2·cyclin B1 regulation pathway downstream of p53.\",\n      \"method\": \"Ectopic expression, cell cycle analysis, Cdc2 activity assay, subcellular fractionation/localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original discovery paper with multiple orthogonal methods (ectopic expression, kinase assay, localization), >166 citations, widely replicated in concept\",\n      \"pmids\": [\"10930422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Estrogen repression of RPRM requires a tripartite interaction among estrogen receptor α (ERα), histone deacetylase 7 (HDAC7), and the chromatin pioneer factor FoxA1. HDAC7 binds ERα and represses its transcriptional activity (independently of HDAC7 deacetylase activity), while FoxA1 is recruited to the RPRM promoter (characterized by H3K4me1/me2 marks). Estrogen treatment causes decreases in H3K4me1/me2 and release of RNA Pol II from the proximal RPRM promoter.\",\n      \"method\": \"ChIP, co-immunoprecipitation, siRNA knockdown, promoter reporter assays, HDAC7 deacetylase-dead mutant\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including Co-IP, ChIP, mutagenesis of HDAC7, and siRNA in a single rigorous study\",\n      \"pmids\": [\"19917725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In pituitary cells, RPRM protein is rapidly degraded via ubiquitination and proteasomal targeting under normal conditions, but cellular stress (growth factor withdrawal) stabilizes RPRM protein levels, indicating post-translational regulation of RPRM abundance.\",\n      \"method\": \"Stable overexpression, proteasome inhibitor treatment, ubiquitination assay, growth factor withdrawal\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical demonstration of ubiquitin-proteasome degradation, single lab study\",\n      \"pmids\": [\"22562171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RPRM overexpression in pituitary tumor cell lines (LβT2 and GH3) decreases cell proliferation and increases apoptosis in response to growth factor deprivation (assessed by caspase-3 cleavage and nuclear condensation), and suppresses colony formation, supporting a tumor suppressor role that is independent of G2/M cell cycle effects in this context.\",\n      \"method\": \"Stable overexpression, proliferation assay, caspase-3 cleavage, clonogenic assay, nuclear condensation\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO/OE with defined cellular phenotype and multiple readouts, single lab\",\n      \"pmids\": [\"22562171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RPRM overexpression in MDA-MB-231 breast cancer cells decreases cell migration, wound healing, and invasion in vitro without altering cell viability, apoptosis (phosphatidylserine translocation), or G2/M cell cycle transition, demonstrating a specific role for RPRM in regulating cell migration and invasion.\",\n      \"method\": \"Ectopic overexpression, transwell migration/invasion assay, wound healing assay, flow cytometry\",\n      \"journal\": \"Biological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular phenotype with multiple migration/invasion assays, single lab\",\n      \"pmids\": [\"26796959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RPRM translocates from the cytoplasm to the nucleus after X-irradiation, interacts with ATM, and promotes ATM nuclear export and proteasomal degradation, thereby negatively regulating ATM protein levels and impairing DNA repair. RPRM nuclear translocation requires phosphorylation at serine 98 by CDK4/6 and is dependent on Importin-11 (IPO11).\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, phosphorylation site mutagenesis, siRNA knockdown of CDK4/6 and IPO11, proteasome inhibitor experiments, in vitro and in vivo irradiation models\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including Co-IP, mutagenesis, nuclear translocation assay, functional rescue, in vivo validation\",\n      \"pmids\": [\"36185355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RPRM deletion in mice preserves hematopoietic stem cell (HSC) regeneration after ionizing radiation by increasing EGFR expression and phosphorylation in HSCs, which activates STAT3 and DNA-PKcs to promote DNA repair and HSC proliferation.\",\n      \"method\": \"RPRM knockout mouse model, flow cytometry, EGFR/STAT3/DNA-PKcs pathway analysis, irradiation model\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined pathway (EGFR-STAT3-DNA-PKcs) and cellular phenotype, single lab\",\n      \"pmids\": [\"36041213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RPRM binds to CREB and promotes its degradation after ionizing radiation, reducing CREB protein levels and thereby downregulating Nrf2 and SCD1, which leads to neuronal ferroptosis via iron accumulation and lipid peroxidation. RPRM deletion restores CREB-Nrf2/SCD1 signaling and protects neurons against radiation-induced ferroptosis.\",\n      \"method\": \"Co-immunoprecipitation (RPRM-CREB interaction), RPRM knockout mouse model, western blot, lipid peroxidation assay, mitochondrial morphology EM, GPX4/SCD1/Nrf2 measurements, primary neuron culture\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP for binding, KO mouse model, multiple pathway readouts, in vitro and in vivo validation in single study\",\n      \"pmids\": [\"38272326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Reprimo protein is secreted extracellularly and extrinsically induces apoptosis in recipient cells. FAT1, FAT4, CELSR1, CELSR2, and CELSR3 (protocadherin family members) were identified as cell-surface receptors for secreted Reprimo. Reprimo acts upstream of the Hippo-YAP/TAZ-p73 axis to transactivate proapoptotic genes, defining a p53-Reprimo-protocadherin-Hippo-YAP/TAZ-p73 extrinsic apoptosis pathway.\",\n      \"method\": \"Secretion assay, receptor identification (binding/pulldown), co-immunoprecipitation, epistasis analysis, YAP/TAZ reporter assay, in vivo tumor suppression models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — receptor identification, epistasis, secretion assay, in vivo validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"39913207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LINC00467 promotes methylation and silencing of the RPRM promoter in gastric cancer cells by recruiting DNA methyltransferase 1 (DNMT1) to the RPRM promoter region.\",\n      \"method\": \"RNA immunoprecipitation, ChIP for DNMT1 at RPRM promoter, bisulfite sequencing, LINC00467 knockdown/overexpression\",\n      \"journal\": \"Bioengineered\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct demonstration of DNMT1 recruitment by ChIP and RIP, single lab\",\n      \"pmids\": [\"35549646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ERα signaling in Rprm-lineage cells in the mediobasal hypothalamus regulates thermoregulation in female mice; selective knockout of ERα in Rprm-expressing cells (RERKO) alters core temperature, brown adipose tissue temperature, and tail temperature in a sex-specific manner, mediated by the nervous system rather than adipose tissue directly.\",\n      \"method\": \"Conditional knockout (ReprimoCre mouse), in vivo temperature measurement, BAT mass quantification, cell ablation in mediobasal hypothalamus\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic conditional KO with defined physiological phenotype, supported by cell ablation experiment, single lab\",\n      \"pmids\": [\"41315012\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPRM (Reprimo) is a p53-target gene encoding a cytoplasmic, highly glycosylated protein that acts as a tumor suppressor through multiple mechanisms: it induces G2/M cell cycle arrest by inhibiting Cdc2·cyclin B1 complex activity and nuclear translocation; it is secreted extracellularly to bind protocadherin family receptors (FAT1, FAT4, CELSR1-3) and activate the Hippo-YAP/TAZ-p73 apoptosis axis in neighboring cells; it translocates to the nucleus upon CDK4/6-mediated phosphorylation (Ser98) via IPO11 to promote ATM proteasomal degradation and sensitize cells to DNA damage; it binds CREB and promotes its degradation after irradiation, reducing Nrf2/SCD1 and causing neuronal ferroptosis; and its transcription is epigenetically repressed by promoter hypermethylation (recruited via LINC00467-DNMT1) or by estrogen through an ERα-HDAC7-FoxA1 tripartite complex, while RPRM protein stability is itself regulated by ubiquitin-proteasomal degradation under basal conditions.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RPRM (Reprimo) is a p53-induced tumor suppressor that operates through both cell-autonomous and non-cell-autonomous mechanisms to control cell cycle progression, apoptosis, DNA damage responses, and cell migration. In its cell-autonomous role, RPRM localizes to the cytoplasm and induces G2 arrest by inhibiting Cdc2 kinase activity and blocking nuclear translocation of cyclin B1 [PMID:10930422]; upon irradiation, CDK4/6 phosphorylates RPRM at Ser98, enabling IPO11-dependent nuclear import where RPRM binds ATM and promotes its proteasomal degradation, thereby modulating DNA repair [PMID:36185355]. RPRM also binds CREB and promotes its degradation after irradiation, reducing Nrf2/SCD1 signaling and triggering neuronal ferroptosis [PMID:38272326]. In its non-cell-autonomous role, RPRM is secreted and engages protocadherin family receptors (FAT1, FAT4, CELSR1–3) on neighboring cells to activate the Hippo-YAP/TAZ-p73 extrinsic apoptosis pathway [PMID:39913207].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"The discovery that RPRM is a p53 target gene that arrests cells at G2 by inhibiting Cdc2 activity and blocking cyclin B1 nuclear translocation established RPRM as a downstream effector of p53 in cell cycle control.\",\n      \"evidence\": \"Ectopic expression with cell cycle analysis, Cdc2 kinase assay, and subcellular fractionation in human cell lines\",\n      \"pmids\": [\"10930422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous RPRM loss-of-function not tested\", \"Direct binding to Cdc2/cyclin B1 not demonstrated\", \"Mechanism of Cdc2 inhibition (direct vs. indirect) unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of a tripartite ERα–HDAC7–FoxA1 complex that represses RPRM transcription upon estrogen signaling revealed an epigenetic mechanism for silencing this tumor suppressor in hormone-responsive contexts.\",\n      \"evidence\": \"ChIP, co-immunoprecipitation, siRNA knockdown, and HDAC7 deacetylase-dead mutant in breast cancer cells\",\n      \"pmids\": [\"19917725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether estrogen-mediated RPRM silencing contributes to breast tumorigenesis in vivo\", \"Role of HDAC7 catalytic-independent repression mechanism unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstration that RPRM protein is constitutively degraded via ubiquitin-proteasome pathway and stabilized by stress, coupled with evidence that RPRM overexpression suppresses proliferation and promotes apoptosis in pituitary cells, established post-translational control of RPRM abundance and broadened its tumor suppressor function beyond G2 arrest.\",\n      \"evidence\": \"Proteasome inhibitor treatment, ubiquitination assay, caspase-3 cleavage, and clonogenic assay in pituitary tumor cell lines\",\n      \"pmids\": [\"22562171\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ubiquitin ligase for RPRM not identified\", \"Whether apoptosis induction requires the same pathway as G2 arrest unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Finding that RPRM overexpression specifically suppresses cell migration and invasion without affecting viability or cell cycle in breast cancer cells expanded RPRM's functional repertoire to motility regulation.\",\n      \"evidence\": \"Transwell migration/invasion assays, wound healing assay, and flow cytometry in MDA-MB-231 cells\",\n      \"pmids\": [\"26796959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular targets mediating anti-migratory effect not identified\", \"No in vivo metastasis model tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Three independent studies in 2022 revealed: (1) RPRM undergoes CDK4/6-dependent Ser98 phosphorylation and IPO11-mediated nuclear translocation to promote ATM degradation after irradiation; (2) RPRM deletion protects hematopoietic stem cells from radiation via EGFR–STAT3–DNA-PKcs upregulation; and (3) LINC00467 recruits DNMT1 to methylate the RPRM promoter in gastric cancer. These collectively established RPRM as a central modulator of DNA damage responses and clarified epigenetic silencing mechanisms.\",\n      \"evidence\": \"Co-IP, phospho-site mutagenesis, IPO11 knockdown, proteasome inhibitors, RPRM KO mouse irradiation model, RIP/ChIP for DNMT1 at RPRM promoter\",\n      \"pmids\": [\"36185355\", \"36041213\", \"35549646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of RPRM–ATM interaction unknown\", \"Whether CDK4/6 phosphorylation regulates functions beyond nuclear import unclear\", \"LINC00467–DNMT1 mechanism validated in a single cancer type\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of CREB as a direct RPRM-binding partner whose degradation after irradiation suppresses Nrf2/SCD1 and triggers neuronal ferroptosis linked RPRM to a non-apoptotic cell death pathway in the nervous system.\",\n      \"evidence\": \"Co-immunoprecipitation of RPRM–CREB, RPRM KO mouse, lipid peroxidation assay, primary neuron culture\",\n      \"pmids\": [\"38272326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RPRM-CREB interaction is direct or scaffolded not established\", \"Ferroptosis relevance beyond radiation-induced injury untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that RPRM is secreted and engages protocadherin receptors (FAT1, FAT4, CELSR1–3) to activate the Hippo-YAP/TAZ-p73 apoptosis axis fundamentally recast RPRM as a non-cell-autonomous tumor suppressor ligand, defining a complete p53–Reprimo–protocadherin–Hippo–p73 extrinsic signaling pathway.\",\n      \"evidence\": \"Secretion assay, receptor identification by pulldown, epistasis analysis, YAP/TAZ reporter, in vivo tumor models\",\n      \"pmids\": [\"39913207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of RPRM–protocadherin binding unknown\", \"Relative contribution of cell-autonomous vs. secreted RPRM to tumor suppression in vivo unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conditional ERα knockout in Rprm-lineage hypothalamic neurons revealed a sex-specific role for these cells in thermoregulation, extending RPRM biology to neuroendocrine physiology.\",\n      \"evidence\": \"ReprimoCre conditional knockout mouse, core/BAT/tail temperature measurements, cell ablation in mediobasal hypothalamus\",\n      \"pmids\": [\"41315012\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RPRM protein itself has a functional role in thermoregulation or merely marks a neuronal population is unresolved\", \"Downstream effectors of ERα in Rprm neurons not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the identity of the E3 ligase(s) mediating RPRM ubiquitin-proteasomal turnover; the structural basis of RPRM interactions with ATM, CREB, and protocadherin receptors; and whether the cell-autonomous (G2 arrest, ATM degradation) and non-cell-autonomous (secreted ligand) functions are independently regulated or coordinated in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"E3 ligase for RPRM degradation unidentified\", \"No structural data for RPRM or its complexes\", \"In vivo partitioning between intracellular and secreted RPRM functions unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 7]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ATM\", \"CREB\", \"FAT1\", \"FAT4\", \"CELSR1\", \"IPO11\", \"HDAC7\", \"FOXA1\"],\n    \"other_free_text\": []\n  }\n}\n```"}