{"gene":"NXPH4","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2022,"finding":"NXPH4 maintains the stability of NDUFA4L2 protein, and this interaction is required for NXPH4-regulated reactive oxygen species elevation and glycolysis activation in gemcitabine-resistant bladder cancer cells, as demonstrated by rescue assays in cell lines and validated in vivo.","method":"Glycolytic activity assay, ROS measurement, rescue assays in cell lines, in vivo validation","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional rescue assays with NDUFA4L2 knockdown establish pathway placement, in vivo validation, but no direct binding/co-IP data described in abstract","pmids":["35954445"],"is_preprint":false},{"year":2022,"finding":"In NSCLC cells, NXPH4 expression is transcriptionally activated by EZH2 (upstream regulator), and NXPH4 in turn interacts with CDKN2A protein and downregulates its protein stability, thereby participating in cell cycle regulation through the cyclinD-CDK4/6-pRB-E2F signaling pathway.","method":"siRNA knockdown, co-immunoprecipitation/interaction assay, western blot for protein stability, cell cycle analysis","journal":"Bioscience, biotechnology, and biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, interaction with CDKN2A and upstream EZH2 regulation reported with protein stability assays, but abstract does not detail binding assay methodology rigorously","pmids":["34919637"],"is_preprint":false},{"year":2024,"finding":"NXPH4 mRNA avoids degradation through RNautophagy via an m5C-dependent mechanism, and NXPH4 protein stabilizes HIF1A by competitively binding to PHD4, thereby amplifying the HIF signaling pathway in colorectal cancer cells.","method":"In vitro cellular experiments, organoid models, murine models, competitive binding assays to PHD4","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — competitive binding to PHD4 and m5C-dependent mRNA stability established in multiple model systems (cell, organoid, in vivo), single lab","pmids":["39164641"],"is_preprint":false},{"year":2025,"finding":"The transcription factor ETS1 directly binds to the NXPH4 promoter and positively regulates NXPH4 expression in OSCC cells, as demonstrated by chromatin immunoprecipitation and dual luciferase reporter assay. NXPH4 silencing promotes apoptosis, increases ROS/MDA levels, suppresses GPX4 expression, and inhibits macrophage M2 polarization, while NXPH4 overexpression rescues the effects of ETS1 knockdown.","method":"ChIP assay, dual luciferase reporter assay, siRNA knockdown, flow cytometry, EdU staining, in vivo tumor models","journal":"Cytotechnology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase assay, rescue experiments validate pathway; single lab","pmids":["41321684"],"is_preprint":false},{"year":2026,"finding":"NXPH4 partially localizes to mitochondria and physically interacts with ALDH1L2 (a one-carbon metabolism enzyme). Androgen receptor (AR) acts as a transcriptional activator of NXPH4. Androgen deprivation stimulates NXPH4 mitochondrial translocation and enhances its binding to ALDH1L2, promoting mitochondrial metabolic reprogramming and enzalutamide resistance in prostate cancer cells.","method":"Subcellular fractionation/localization, co-immunoprecipitation, gain- and loss-of-function studies in cell lines and mouse xenograft models, molecular and biochemical experiments","journal":"Cell death discovery","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction (co-IP), subcellular localization with functional consequence, gain/loss-of-function with in vivo validation, multiple orthogonal methods in single lab","pmids":["41639054"],"is_preprint":false},{"year":2025,"finding":"Chemogenetic inhibition of Nxph4+ neurons in the postero-lateral hypothalamus of mice suppressed multiple aspects of social motivation, establishing a defined functional role for this neuronal population in social behavior.","method":"Chemogenetic inhibition (DREADD), single-nucleus RNA-sequencing, behavioral assays in mice","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — chemogenetic manipulation with behavioral readout establishes functional role in vivo, but preprint and single study","pmids":["bio_10.1101_2025.03.10.642464"],"is_preprint":true}],"current_model":"NXPH4 is a neuropeptide-like glycoprotein that, in cancer contexts, stabilizes NDUFA4L2 to activate ROS/glycolysis, interacts with CDKN2A to reduce its stability and activate CDK4/6-pRB-E2F cell cycle signaling (downstream of EZH2-mediated transcriptional activation), stabilizes HIF1A by competitively binding PHD4 (with its own mRNA protected from degradation via m5C-dependent RNautophagy), and localizes to mitochondria where it physically interacts with ALDH1L2 to drive metabolic reprogramming under androgen deprivation (with AR as its transcriptional activator and ETS1 as an additional upstream regulator); in the brain, Nxph4-expressing neurons in the postero-lateral hypothalamus functionally regulate social motivation."},"narrative":{"mechanistic_narrative":"NXPH4 is a glycoprotein that functions across diverse cancer contexts as a driver of metabolic reprogramming, cell cycle progression, and therapy resistance, while a Nxph4-expressing neuronal population separately governs social behavior [PMID:41639054, PMID:bio_10.1101_2025.03.10.642464]. Mechanistically, NXPH4 acts largely by stabilizing partner proteins: it maintains NDUFA4L2 protein to elevate reactive oxygen species and activate glycolysis in gemcitabine-resistant bladder cancer [PMID:35954445], it competitively binds the prolyl hydroxylase PHD4 to stabilize HIF1A and amplify HIF signaling in colorectal cancer [PMID:39164641], and it binds and destabilizes CDKN2A to drive cyclinD-CDK4/6-pRB-E2F cell cycle signaling in NSCLC [PMID:34919637]. In prostate cancer, NXPH4 partially localizes to mitochondria and physically interacts with the one-carbon metabolism enzyme ALDH1L2; androgen deprivation stimulates its mitochondrial translocation and ALDH1L2 binding to promote metabolic reprogramming and enzalutamide resistance [PMID:41639054]. Its expression is transcriptionally controlled by multiple upstream regulators across these contexts, including EZH2, ETS1, and the androgen receptor [PMID:34919637, PMID:41321684, PMID:41639054], and ETS1-driven NXPH4 suppresses apoptosis and GPX4 while promoting macrophage M2 polarization [PMID:41321684]. Its own mRNA escapes RNautophagy-mediated degradation through an m5C-dependent mechanism [PMID:39164641]. Beyond these cancer-context interactions and the hypothalamic neuronal role, no unifying biochemical activity for NXPH4 has been characterized in the available corpus.","teleology":[{"year":2022,"claim":"Established a first functional mechanism for NXPH4 in cancer by placing it upstream of NDUFA4L2 stability to control redox and glycolytic state in chemoresistance.","evidence":"Glycolytic and ROS assays with rescue experiments and in vivo validation in gemcitabine-resistant bladder cancer cells","pmids":["35954445"],"confidence":"Medium","gaps":["No direct NXPH4–NDUFA4L2 binding/co-IP data described","Mechanism by which NXPH4 stabilizes NDUFA4L2 unknown"]},{"year":2022,"claim":"Identified an EZH2→NXPH4→CDKN2A axis, showing NXPH4 destabilizes a tumor suppressor to engage cell cycle progression.","evidence":"siRNA knockdown, interaction assay, protein stability westerns, and cell cycle analysis in NSCLC cells","pmids":["34919637"],"confidence":"Medium","gaps":["Binding assay methodology not rigorously detailed","Direct vs indirect destabilization of CDKN2A not resolved","Single lab, in vitro emphasis"]},{"year":2024,"claim":"Defined how NXPH4 stabilizes HIF1A and how its own transcript is protected, linking NXPH4 to HIF signaling.","evidence":"Competitive PHD4 binding assays plus m5C-dependent RNautophagy studies in cells, organoids, and mouse models of colorectal cancer","pmids":["39164641"],"confidence":"Medium","gaps":["Structural basis of PHD4 competition unknown","m5C writer/reader controlling NXPH4 mRNA not identified","Single lab"]},{"year":2025,"claim":"Established ETS1 as a direct transcriptional activator of NXPH4 and tied NXPH4 to ferroptosis-related and immune phenotypes.","evidence":"ChIP, dual luciferase reporter, knockdown/overexpression rescue, flow cytometry, and in vivo tumor models in OSCC","pmids":["41321684"],"confidence":"Medium","gaps":["Molecular link between NXPH4 and GPX4/M2 polarization unresolved","Single lab"]},{"year":2026,"claim":"Demonstrated NXPH4 mitochondrial localization and ALDH1L2 binding under androgen deprivation, defining a context-dependent metabolic resistance mechanism.","evidence":"Subcellular fractionation, reciprocal co-IP, gain/loss-of-function studies, and mouse xenografts in prostate cancer cells","pmids":["41639054"],"confidence":"High","gaps":["Consequence of ALDH1L2 binding on one-carbon flux not biochemically dissected","Trigger for mitochondrial translocation unclear"]},{"year":2025,"claim":"Assigned a defined in vivo function to Nxph4-expressing neurons in regulating social motivation, distinct from the gene's cancer roles.","evidence":"Chemogenetic (DREADD) inhibition, single-nucleus RNA-seq, and behavioral assays in mice (preprint)","pmids":["bio_10.1101_2025.03.10.642464"],"confidence":"Medium","gaps":["Preprint, single study","Molecular function of NXPH4 within these neurons not addressed","Cell-autonomous role of NXPH4 protein not tested"]},{"year":null,"claim":"A unifying biochemical activity for NXPH4 reconciling its multiple partner-stabilizing roles and its neuronal function remains undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No shared structural or enzymatic basis identified across NDUFA4L2, PHD4, CDKN2A, and ALDH1L2 interactions","No structural model of NXPH4 complexes"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,4]}],"complexes":[],"partners":["NDUFA4L2","CDKN2A","PHD4","ALDH1L2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95158","full_name":"Neurexophilin-4","aliases":[],"length_aa":308,"mass_kda":33.1,"function":"May be signaling molecules that resemble neuropeptides and that act by binding to alpha-neurexins and possibly other receptors","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/O95158/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NXPH4","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NXPH4","total_profiled":1310},"omim":[{"mim_id":"604639","title":"NEUREXOPHILIN 1; NXPH1","url":"https://www.omim.org/entry/604639"},{"mim_id":"604637","title":"NEUREXOPHILIN 4; NXPH4","url":"https://www.omim.org/entry/604637"},{"mim_id":"604636","title":"NEUREXOPHILIN 3; NXPH3","url":"https://www.omim.org/entry/604636"},{"mim_id":"604635","title":"NEUREXOPHILIN 2; NXPH2","url":"https://www.omim.org/entry/604635"},{"mim_id":"300005","title":"METHYL-CpG-BINDING PROTEIN 2; MECP2","url":"https://www.omim.org/entry/300005"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":18.5},{"tissue":"skin 1","ntpm":18.4}],"url":"https://www.proteinatlas.org/search/NXPH4"},"hgnc":{"alias_symbol":["NPH4"],"prev_symbol":[]},"alphafold":{"accession":"O95158","domains":[{"cath_id":"2.60.40","chopping":"106-157_232-298","consensus_level":"medium","plddt":87.0209,"start":106,"end":298}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95158","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95158-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95158-F1-predicted_aligned_error_v6.png","plddt_mean":60.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NXPH4","jax_strain_url":"https://www.jax.org/strain/search?query=NXPH4"},"sequence":{"accession":"O95158","fasta_url":"https://rest.uniprot.org/uniprotkb/O95158.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95158/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95158"}},"corpus_meta":[{"pmid":"15960621","id":"PMC_15960621","title":"NPH4/ARF7 and ARF19 promote leaf expansion and auxin-induced lateral root formation.","date":"2005","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15960621","citation_count":305,"is_preprint":false},{"pmid":"35954445","id":"PMC_35954445","title":"NXPH4 Promotes Gemcitabine Resistance in Bladder Cancer by Enhancing Reactive Oxygen Species and Glycolysis Activation through Modulating NDUFA4L2.","date":"2022","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/35954445","citation_count":22,"is_preprint":false},{"pmid":"34919637","id":"PMC_34919637","title":"A novel EZH2/NXPH4/CDKN2A axis is involved in regulating the proliferation and migration of non-small cell lung cancer cells.","date":"2022","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34919637","citation_count":21,"is_preprint":false},{"pmid":"35456219","id":"PMC_35456219","title":"Serum Proteins, HMMR, NXPH4, PITX1 and THBS4; A Panel of Biomarkers for Early Diagnosis of Hepatocellular Carcinoma.","date":"2022","source":"Journal of clinical medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35456219","citation_count":21,"is_preprint":false},{"pmid":"39164641","id":"PMC_39164641","title":"NXPH4 mediated by m5C contributes to the malignant characteristics of colorectal cancer via inhibiting HIF1A degradation.","date":"2024","source":"Cellular & molecular biology letters","url":"https://pubmed.ncbi.nlm.nih.gov/39164641","citation_count":17,"is_preprint":false},{"pmid":"38613793","id":"PMC_38613793","title":"NXPH4 can be used as a biomarker for pan-cancer and promotes colon cancer progression.","date":"2024","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/38613793","citation_count":3,"is_preprint":false},{"pmid":"41321684","id":"PMC_41321684","title":"ETS1 facilitates the progression of OSCC and contributes to macrophage M2 polarization via regulating NXPH4.","date":"2025","source":"Cytotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/41321684","citation_count":0,"is_preprint":false},{"pmid":"41639054","id":"PMC_41639054","title":"Targeting NXPH4/ALDH1L2 signaling suppresses enzalutamide resistance in prostate cancer.","date":"2026","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/41639054","citation_count":0,"is_preprint":false},{"pmid":"41747960","id":"PMC_41747960","title":"Integrative bioinformatics and machine learning combined with experimental validation in a doxorubicin-induced model identify BACH2, NXPH4, CD1E, and LIF as sodium overload-related molecular signatures in dilated cardiomyopathy.","date":"2026","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41747960","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.10.642464","title":"Single-Cell Resolution of Individual Variation in Hypothalamic Neurons Allows Targeted Manipulation Affecting Social Motivation","date":"2025-03-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.10.642464","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7324,"output_tokens":1640,"usd":0.023286,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8447,"output_tokens":2357,"usd":0.05058,"stage2_stop_reason":"end_turn"},"total_usd":0.073866,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"NXPH4 maintains the stability of NDUFA4L2 protein, and this interaction is required for NXPH4-regulated reactive oxygen species elevation and glycolysis activation in gemcitabine-resistant bladder cancer cells, as demonstrated by rescue assays in cell lines and validated in vivo.\",\n      \"method\": \"Glycolytic activity assay, ROS measurement, rescue assays in cell lines, in vivo validation\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional rescue assays with NDUFA4L2 knockdown establish pathway placement, in vivo validation, but no direct binding/co-IP data described in abstract\",\n      \"pmids\": [\"35954445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In NSCLC cells, NXPH4 expression is transcriptionally activated by EZH2 (upstream regulator), and NXPH4 in turn interacts with CDKN2A protein and downregulates its protein stability, thereby participating in cell cycle regulation through the cyclinD-CDK4/6-pRB-E2F signaling pathway.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation/interaction assay, western blot for protein stability, cell cycle analysis\",\n      \"journal\": \"Bioscience, biotechnology, and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, interaction with CDKN2A and upstream EZH2 regulation reported with protein stability assays, but abstract does not detail binding assay methodology rigorously\",\n      \"pmids\": [\"34919637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NXPH4 mRNA avoids degradation through RNautophagy via an m5C-dependent mechanism, and NXPH4 protein stabilizes HIF1A by competitively binding to PHD4, thereby amplifying the HIF signaling pathway in colorectal cancer cells.\",\n      \"method\": \"In vitro cellular experiments, organoid models, murine models, competitive binding assays to PHD4\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — competitive binding to PHD4 and m5C-dependent mRNA stability established in multiple model systems (cell, organoid, in vivo), single lab\",\n      \"pmids\": [\"39164641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The transcription factor ETS1 directly binds to the NXPH4 promoter and positively regulates NXPH4 expression in OSCC cells, as demonstrated by chromatin immunoprecipitation and dual luciferase reporter assay. NXPH4 silencing promotes apoptosis, increases ROS/MDA levels, suppresses GPX4 expression, and inhibits macrophage M2 polarization, while NXPH4 overexpression rescues the effects of ETS1 knockdown.\",\n      \"method\": \"ChIP assay, dual luciferase reporter assay, siRNA knockdown, flow cytometry, EdU staining, in vivo tumor models\",\n      \"journal\": \"Cytotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase assay, rescue experiments validate pathway; single lab\",\n      \"pmids\": [\"41321684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NXPH4 partially localizes to mitochondria and physically interacts with ALDH1L2 (a one-carbon metabolism enzyme). Androgen receptor (AR) acts as a transcriptional activator of NXPH4. Androgen deprivation stimulates NXPH4 mitochondrial translocation and enhances its binding to ALDH1L2, promoting mitochondrial metabolic reprogramming and enzalutamide resistance in prostate cancer cells.\",\n      \"method\": \"Subcellular fractionation/localization, co-immunoprecipitation, gain- and loss-of-function studies in cell lines and mouse xenograft models, molecular and biochemical experiments\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction (co-IP), subcellular localization with functional consequence, gain/loss-of-function with in vivo validation, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"41639054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Chemogenetic inhibition of Nxph4+ neurons in the postero-lateral hypothalamus of mice suppressed multiple aspects of social motivation, establishing a defined functional role for this neuronal population in social behavior.\",\n      \"method\": \"Chemogenetic inhibition (DREADD), single-nucleus RNA-sequencing, behavioral assays in mice\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — chemogenetic manipulation with behavioral readout establishes functional role in vivo, but preprint and single study\",\n      \"pmids\": [\"bio_10.1101_2025.03.10.642464\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"NXPH4 is a neuropeptide-like glycoprotein that, in cancer contexts, stabilizes NDUFA4L2 to activate ROS/glycolysis, interacts with CDKN2A to reduce its stability and activate CDK4/6-pRB-E2F cell cycle signaling (downstream of EZH2-mediated transcriptional activation), stabilizes HIF1A by competitively binding PHD4 (with its own mRNA protected from degradation via m5C-dependent RNautophagy), and localizes to mitochondria where it physically interacts with ALDH1L2 to drive metabolic reprogramming under androgen deprivation (with AR as its transcriptional activator and ETS1 as an additional upstream regulator); in the brain, Nxph4-expressing neurons in the postero-lateral hypothalamus functionally regulate social motivation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NXPH4 is a glycoprotein that functions across diverse cancer contexts as a driver of metabolic reprogramming, cell cycle progression, and therapy resistance, while a Nxph4-expressing neuronal population separately governs social behavior [#4, #5]. Mechanistically, NXPH4 acts largely by stabilizing partner proteins: it maintains NDUFA4L2 protein to elevate reactive oxygen species and activate glycolysis in gemcitabine-resistant bladder cancer [#0], it competitively binds the prolyl hydroxylase PHD4 to stabilize HIF1A and amplify HIF signaling in colorectal cancer [#2], and it binds and destabilizes CDKN2A to drive cyclinD-CDK4/6-pRB-E2F cell cycle signaling in NSCLC [#1]. In prostate cancer, NXPH4 partially localizes to mitochondria and physically interacts with the one-carbon metabolism enzyme ALDH1L2; androgen deprivation stimulates its mitochondrial translocation and ALDH1L2 binding to promote metabolic reprogramming and enzalutamide resistance [#4]. Its expression is transcriptionally controlled by multiple upstream regulators across these contexts, including EZH2, ETS1, and the androgen receptor [#1, #3, #4], and ETS1-driven NXPH4 suppresses apoptosis and GPX4 while promoting macrophage M2 polarization [#3]. Its own mRNA escapes RNautophagy-mediated degradation through an m5C-dependent mechanism [#2]. Beyond these cancer-context interactions and the hypothalamic neuronal role, no unifying biochemical activity for NXPH4 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2022,\n      \"claim\": \"Established a first functional mechanism for NXPH4 in cancer by placing it upstream of NDUFA4L2 stability to control redox and glycolytic state in chemoresistance.\",\n      \"evidence\": \"Glycolytic and ROS assays with rescue experiments and in vivo validation in gemcitabine-resistant bladder cancer cells\",\n      \"pmids\": [\"35954445\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct NXPH4–NDUFA4L2 binding/co-IP data described\", \"Mechanism by which NXPH4 stabilizes NDUFA4L2 unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified an EZH2→NXPH4→CDKN2A axis, showing NXPH4 destabilizes a tumor suppressor to engage cell cycle progression.\",\n      \"evidence\": \"siRNA knockdown, interaction assay, protein stability westerns, and cell cycle analysis in NSCLC cells\",\n      \"pmids\": [\"34919637\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding assay methodology not rigorously detailed\", \"Direct vs indirect destabilization of CDKN2A not resolved\", \"Single lab, in vitro emphasis\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined how NXPH4 stabilizes HIF1A and how its own transcript is protected, linking NXPH4 to HIF signaling.\",\n      \"evidence\": \"Competitive PHD4 binding assays plus m5C-dependent RNautophagy studies in cells, organoids, and mouse models of colorectal cancer\",\n      \"pmids\": [\"39164641\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of PHD4 competition unknown\", \"m5C writer/reader controlling NXPH4 mRNA not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established ETS1 as a direct transcriptional activator of NXPH4 and tied NXPH4 to ferroptosis-related and immune phenotypes.\",\n      \"evidence\": \"ChIP, dual luciferase reporter, knockdown/overexpression rescue, flow cytometry, and in vivo tumor models in OSCC\",\n      \"pmids\": [\"41321684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between NXPH4 and GPX4/M2 polarization unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Demonstrated NXPH4 mitochondrial localization and ALDH1L2 binding under androgen deprivation, defining a context-dependent metabolic resistance mechanism.\",\n      \"evidence\": \"Subcellular fractionation, reciprocal co-IP, gain/loss-of-function studies, and mouse xenografts in prostate cancer cells\",\n      \"pmids\": [\"41639054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Consequence of ALDH1L2 binding on one-carbon flux not biochemically dissected\", \"Trigger for mitochondrial translocation unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Assigned a defined in vivo function to Nxph4-expressing neurons in regulating social motivation, distinct from the gene's cancer roles.\",\n      \"evidence\": \"Chemogenetic (DREADD) inhibition, single-nucleus RNA-seq, and behavioral assays in mice (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.03.10.642464\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single study\", \"Molecular function of NXPH4 within these neurons not addressed\", \"Cell-autonomous role of NXPH4 protein not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unifying biochemical activity for NXPH4 reconciling its multiple partner-stabilizing roles and its neuronal function remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No shared structural or enzymatic basis identified across NDUFA4L2, PHD4, CDKN2A, and ALDH1L2 interactions\", \"No structural model of NXPH4 complexes\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NDUFA4L2\", \"CDKN2A\", \"PHD4\", \"ALDH1L2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}