{"gene":"AGPS","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":2013,"finding":"AGPS (alkylglyceronephosphate synthase) catalyzes a critical step in ether lipid synthesis, and its ablation in cancer cells reduces ether lipid levels while altering fatty acid, eicosanoid, and glycerophospholipid metabolism, resulting in reduced levels of oncogenic signaling lipids (including LPA, LPAe, and prostaglandins) and impaired cancer cell survival, aggressiveness, and tumor growth.","method":"Genetic ablation (siRNA/shRNA knockdown) in multiple cancer cell lines and tumor xenograft models, followed by lipidomic profiling","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KD with defined cellular and metabolic phenotype, replicated across multiple cancer cell lines and in vivo tumor models, multiple orthogonal readouts","pmids":["23980144"],"is_preprint":false},{"year":2011,"finding":"AGPS is transported into the peroxisome by PEX7 and partners with GNPAT on the luminal membrane surface; the presence of AGPS is required for full GNPAT activity, and substrate channeling from GNPAT to AGPS is necessary for plasmalogen synthesis. AGPS mutations causing RCDP3 result in loss of this enzymatic partnership.","method":"Patient cell line analysis comparing AGPS and GNPAT protein levels; protein structural modeling of AGPS mutations; transcript analysis of GNPAT mutations","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-line-based protein quantification and structural modeling in single lab, multiple patient-derived lines supporting substrate channeling model","pmids":["21990100"],"is_preprint":false},{"year":2011,"finding":"A hypomorphic mutation in Agps (bs2 mice) causing aberrant splicing and loss of the FAD enzymatic domain results in significantly decreased ether lipid levels, cataracts from disrupted lens fiber cells, and male sterility due to absence of mature sperm and multinucleate cell formation in seminiferous tubules, establishing AGPS as the causal gene for these phenotypes.","method":"Genetic mapping, sequence analysis, RT-PCR characterization of aberrant transcripts, lipid mass spectrometry, histological evaluation of lens and testes in bs2 mice","journal":"Molecular genetics and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic model with molecular characterization of mutation, biochemical confirmation of ether lipid depletion, and multiple tissue phenotypes linked to AGPS deficiency","pmids":["21353609"],"is_preprint":false},{"year":2014,"finding":"Agps knockout mice show ~85% embryonic lethality; surviving mice exhibit cataracts and testicular abnormalities similar to bs2 hypomorphic mice, confirming that AGPS is required for normal embryonic development and for lens and spermatogenic cell function.","method":"Knockout mouse generation (KOMP), survival analysis, clinical and histological phenotyping","journal":"Molecular genetics and metabolism reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — complete knockout mouse model with defined embryonic lethal and tissue-specific phenotypes, corroborating mechanistic findings from hypomorphic model","pmids":["25197626"],"is_preprint":false},{"year":2014,"finding":"Silencing of AGPS in chemotherapy-resistant glioma and hepatic carcinoma cell lines reduces intracellular LPA, LPAe, and PGE2 levels, decreases LPA receptor- and EP receptor-mediated PI3K/AKT signaling, and suppresses expression of multi-drug resistance genes (MDR1, MRP1, ABCG2), leading to increased drug sensitivity, cell cycle arrest, and apoptosis.","method":"siRNA knockdown in U87MG/DDP and HepG2/ADM cell lines, lipid measurement, Western blotting for signaling pathway components and MDR genes, cell proliferation and apoptosis assays","journal":"Asian Pacific journal of cancer prevention","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined lipid-signaling and drug-resistance phenotypes, single lab, multiple readouts","pmids":["24815474"],"is_preprint":false},{"year":2015,"finding":"Small-molecule AGPS inhibitors identified by screening bind to distinct portions of the AGPS active site (structurally characterized), selectively lower ether lipid levels in human cancer cells, and impair cancer cell survival and migration, confirming AGPS enzymatic activity as pharmacologically targetable.","method":"Small-molecule screen, structural characterization of inhibitor-enzyme interactions (crystallography implied), ether lipid profiling by mass spectrometry, cell viability and migration assays in cancer cells","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural characterization of inhibitor binding to active site combined with functional in-cell lipid and phenotypic readouts, single lab but multiple orthogonal methods","pmids":["26322624"],"is_preprint":false},{"year":2021,"finding":"AGPS interacts with HNRNPK as identified by co-immunoprecipitation and mass spectrometry in glioma cells; co-localization confirmed in the cellular nucleus by confocal microscopy. HNRNPK can reverse the suppression of cell proliferation and ether lipid secretion caused by AGPS silencing, placing HNRNPK downstream or in a compensatory pathway relative to AGPS.","method":"Co-immunoprecipitation, mass spectrometry, Western blot, confocal laser microscopy, AGPS silencing followed by HNRNPK rescue in glioma cell lines","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reciprocal Co-IP plus MS identification and rescue experiment, but single lab and nuclear co-localization of a peroxisomal enzyme with an RNA-binding protein is biologically unusual; moderate caution warranted","pmids":["34621897"],"is_preprint":false},{"year":2024,"finding":"AGPS is ubiquitinated and degraded via the proteasomal pathway by the E3 ubiquitin ligase MDM2. The kinase TrkA phosphorylates AGPS at Y451, promoting the AGPS–MDM2 interaction and thus accelerating AGPS degradation. TrkA inhibition (with larotrectinib) increases AGPS levels, sensitizes prostate cancer cells to ferroptosis, and inhibits tumor growth in vivo.","method":"Co-immunoprecipitation and GST pull-down (in vivo and in vitro), label-free mass spectrometry, site-directed mutagenesis (Y451), cell viability/colony formation assays, xenograft tumor model","journal":"Journal of experimental & clinical cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution (GST pull-down), Co-IP, mutagenesis of phosphorylation site, and in vivo xenograft validation; multiple orthogonal methods in single lab","pmids":["38200609"],"is_preprint":false},{"year":2026,"finding":"The AGPS 5'UTR regulatory variant rs113671272 exhibits allele-specific binding to transcription factor MEIS3; MEIS3 knockdown suppresses AGPS expression. AGPS knockdown inhibits ESCC cell proliferation, migration, and tumor growth, while overexpression promotes oncogenic phenotypes via NF-κB activation, defining a MEIS3/AGPS/NF-κB regulatory axis.","method":"CUT&Tag-qPCR, EMSA (electrophoretic mobility shift assay), RNA interference, xenograft tumors, transcriptomic profiling, Western blotting","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and CUT&Tag confirm allele-specific TF binding; functional rescue and pathway analysis from single lab with multiple orthogonal methods","pmids":["41950565"],"is_preprint":false}],"current_model":"AGPS (alkylglyceronephosphate synthase) is a peroxisomal FAD-containing enzyme that catalyzes the key step in ether lipid (plasmalogen and alkyl-glycerophospholipid) biosynthesis by forming the ether bond; it is imported into the peroxisome by PEX7 and partners with GNPAT for substrate channeling, is regulated post-translationally by TrkA-mediated phosphorylation at Y451 that promotes MDM2-dependent ubiquitination and proteasomal degradation, and controls the balance of structural and oncogenic signaling lipids (LPA, LPAe, PGE2) to sustain cancer cell survival, drug resistance, and tumor growth via PI3K/AKT and NF-κB signaling; loss of AGPS in mice causes embryonic lethality, cataracts, and male sterility due to ether lipid depletion."},"narrative":{"mechanistic_narrative":"AGPS (alkylglyceronephosphate synthase) is the peroxisomal enzyme that catalyzes a committed step in ether lipid biosynthesis, and its activity governs the cellular pool of structural and signaling ether lipids that sustain cancer cell survival and tumor growth [PMID:23980144]. Within the peroxisome, AGPS is imported by PEX7 and functions in partnership with GNPAT on the luminal membrane surface, where its presence is required for full GNPAT activity and substrate channeling into plasmalogen synthesis; AGPS mutations that disrupt this partnership cause rhizomelic chondrodysplasia punctata type 3 (RCDP3) [PMID:21990100]. In mice, hypomorphic disruption that deletes the FAD enzymatic domain and complete knockout both deplete ether lipids and produce cataracts, male sterility, and substantial embryonic lethality, establishing AGPS as essential for development, lens fiber, and spermatogenic cell function [PMID:21353609, PMID:25197626]. In cancer, loss of AGPS lowers oncogenic signaling lipids including LPA, LPAe, and prostaglandins, attenuating LPA- and EP-receptor-driven PI3K/AKT signaling and multidrug-resistance gene expression, while pharmacological inhibitors that bind the AGPS active site selectively reduce ether lipids and impair cancer cell survival and migration [PMID:23980144, PMID:24815474, PMID:26322624]. AGPS is regulated post-translationally: TrkA phosphorylates AGPS at Y451 to promote MDM2-mediated ubiquitination and proteasomal degradation, and blocking this axis raises AGPS levels and sensitizes prostate cancer cells to ferroptosis [PMID:38200609]. Transcriptionally, a MEIS3/AGPS/NF-κB axis drives oncogenic phenotypes in esophageal squamous cell carcinoma [PMID:41950565].","teleology":[{"year":2011,"claim":"Established how AGPS is delivered to its site of action and that it does not act alone, defining the peroxisomal import route and the enzymatic partnership underlying plasmalogen synthesis.","evidence":"Patient-derived cell-line protein quantification, structural modeling of AGPS mutations, and transcript analysis comparing AGPS and GNPAT","pmids":["21990100"],"confidence":"Medium","gaps":["Substrate channeling inferred from protein-level interdependence rather than reconstituted enzymatic assay","Stoichiometry and structural basis of the AGPS–GNPAT complex not resolved"]},{"year":2011,"claim":"Demonstrated in vivo that AGPS enzymatic activity is required for ether lipid production and identified the organismal consequences of its loss, linking the FAD domain to lens and spermatogenic phenotypes.","evidence":"Genetic mapping, transcript characterization, lipid mass spectrometry, and histology in hypomorphic bs2 mice","pmids":["21353609"],"confidence":"High","gaps":["Hypomorphic allele leaves residual function, complicating null interpretation","Mechanism linking ether lipid depletion to specific lens/testis cell pathology not defined"]},{"year":2013,"claim":"Connected AGPS-dependent ether lipid synthesis to oncogenic lipid signaling, showing that AGPS controls levels of LPA, LPAe, and prostaglandins required for cancer cell survival and tumor growth.","evidence":"siRNA/shRNA ablation across multiple cancer cell lines and xenografts with lipidomic profiling","pmids":["23980144"],"confidence":"High","gaps":["Does not establish which downstream lipid species is rate-limiting for the phenotype","Direct receptor-level signaling consequences not measured here"]},{"year":2014,"claim":"Confirmed AGPS is required for normal development using a complete knockout, extending the hypomorphic phenotypes to embryonic lethality.","evidence":"KOMP knockout mouse, survival analysis, and histological phenotyping","pmids":["25197626"],"confidence":"High","gaps":["Cause of embryonic lethality at the cellular/pathway level not determined","Tissue-autonomous requirements not dissected"]},{"year":2014,"claim":"Linked AGPS to chemoresistance by mapping lipid changes to PI3K/AKT signaling and multidrug-resistance gene expression in resistant tumor cells.","evidence":"siRNA knockdown in chemoresistant glioma and hepatic carcinoma lines with lipid measurement, signaling Western blots, and proliferation/apoptosis assays","pmids":["24815474"],"confidence":"Medium","gaps":["Single-lab study with two cell lines","Causality between specific lipids and MDR gene regulation not isolated"]},{"year":2015,"claim":"Validated AGPS as a druggable enzyme by identifying active-site-binding small molecules that phenocopy genetic ablation, establishing therapeutic tractability.","evidence":"Small-molecule screen, structural characterization of inhibitor binding, ether lipid profiling, and viability/migration assays in cancer cells","pmids":["26322624"],"confidence":"High","gaps":["Inhibitor selectivity and potency in vivo not established here","Full enzyme structure with bound substrate not reported"]},{"year":2021,"claim":"Identified HNRNPK as an AGPS interactor that can rescue AGPS-silencing phenotypes, introducing a possible compensatory or downstream node.","evidence":"Co-immunoprecipitation, mass spectrometry, confocal co-localization, and rescue in glioma cells","pmids":["34621897"],"confidence":"Medium","gaps":["Reported nuclear co-localization of a peroxisomal enzyme with an RNA-binding protein is biologically unusual and not mechanistically explained","Single lab; functional relationship to ether lipid synthesis unclear"]},{"year":2024,"claim":"Defined post-translational control of AGPS, showing TrkA-mediated Y451 phosphorylation drives MDM2-dependent proteasomal degradation and links AGPS stability to ferroptosis sensitivity.","evidence":"Co-IP, in vitro GST pull-down, label-free MS, Y451 site-directed mutagenesis, and prostate cancer xenografts with larotrectinib","pmids":["38200609"],"confidence":"High","gaps":["Mechanistic link between AGPS levels and ferroptosis not fully resolved","Whether degradation regulates ether lipid flux quantitatively not measured"]},{"year":2026,"claim":"Established transcriptional regulation of AGPS through an allele-specific MEIS3 binding event, defining a MEIS3/AGPS/NF-κB oncogenic axis in ESCC.","evidence":"CUT&Tag-qPCR, EMSA, RNA interference, xenografts, and transcriptomic profiling","pmids":["41950565"],"confidence":"Medium","gaps":["Single-lab study","Mechanism by which AGPS activates NF-κB not biochemically defined"]},{"year":null,"claim":"How AGPS's peroxisomal enzymatic output is mechanistically coupled to nuclear/transcriptional partners (HNRNPK, NF-κB) and how its post-translational and transcriptional regulation integrate to control ether lipid flux in vivo remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking ether lipid production to nuclear signaling effects","Substrate-bound enzyme structure and catalytic mechanism not reported in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,2,5]}],"localization":[{"term_id":"GO:0005777","term_label":"peroxisome","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,4,7,8]}],"complexes":[],"partners":["GNPAT","PEX7","MDM2","TRKA","HNRNPK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00116","full_name":"Alkyldihydroxyacetonephosphate synthase, peroxisomal","aliases":["Aging-associated gene 5 protein","Alkylglycerone-phosphate synthase"],"length_aa":658,"mass_kda":72.9,"function":"Catalyzes the exchange of the acyl chain in acyl-dihydroxyacetonephosphate (acyl-DHAP) for a long chain fatty alcohol, yielding the first ether linked intermediate, i.e. alkyl-dihydroxyacetonephosphate (alkyl-DHAP), in the pathway of ether lipid biosynthesis","subcellular_location":"Peroxisome membrane; Peroxisome","url":"https://www.uniprot.org/uniprotkb/O00116/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AGPS","classification":"Not 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all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AGPS"},"hgnc":{"alias_symbol":["ADHAPS","ADAS","ALDHPSY","ADPS","ADAP-S"],"prev_symbol":[]},"alphafold":{"accession":"O00116","domains":[{"cath_id":"3.30.465.10","chopping":"267-384","consensus_level":"medium","plddt":98.5686,"start":267,"end":384},{"cath_id":"3.40.462.40","chopping":"388-610","consensus_level":"medium","plddt":92.3312,"start":388,"end":610}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00116","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00116-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00116-F1-predicted_aligned_error_v6.png","plddt_mean":88.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AGPS","jax_strain_url":"https://www.jax.org/strain/search?query=AGPS"},"sequence":{"accession":"O00116","fasta_url":"https://rest.uniprot.org/uniprotkb/O00116.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00116/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00116"}},"corpus_meta":[{"pmid":"23980144","id":"PMC_23980144","title":"Ether 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2013,\n      \"finding\": \"AGPS (alkylglyceronephosphate synthase) catalyzes a critical step in ether lipid synthesis, and its ablation in cancer cells reduces ether lipid levels while altering fatty acid, eicosanoid, and glycerophospholipid metabolism, resulting in reduced levels of oncogenic signaling lipids (including LPA, LPAe, and prostaglandins) and impaired cancer cell survival, aggressiveness, and tumor growth.\",\n      \"method\": \"Genetic ablation (siRNA/shRNA knockdown) in multiple cancer cell lines and tumor xenograft models, followed by lipidomic profiling\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KD with defined cellular and metabolic phenotype, replicated across multiple cancer cell lines and in vivo tumor models, multiple orthogonal readouts\",\n      \"pmids\": [\"23980144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AGPS is transported into the peroxisome by PEX7 and partners with GNPAT on the luminal membrane surface; the presence of AGPS is required for full GNPAT activity, and substrate channeling from GNPAT to AGPS is necessary for plasmalogen synthesis. AGPS mutations causing RCDP3 result in loss of this enzymatic partnership.\",\n      \"method\": \"Patient cell line analysis comparing AGPS and GNPAT protein levels; protein structural modeling of AGPS mutations; transcript analysis of GNPAT mutations\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-line-based protein quantification and structural modeling in single lab, multiple patient-derived lines supporting substrate channeling model\",\n      \"pmids\": [\"21990100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A hypomorphic mutation in Agps (bs2 mice) causing aberrant splicing and loss of the FAD enzymatic domain results in significantly decreased ether lipid levels, cataracts from disrupted lens fiber cells, and male sterility due to absence of mature sperm and multinucleate cell formation in seminiferous tubules, establishing AGPS as the causal gene for these phenotypes.\",\n      \"method\": \"Genetic mapping, sequence analysis, RT-PCR characterization of aberrant transcripts, lipid mass spectrometry, histological evaluation of lens and testes in bs2 mice\",\n      \"journal\": \"Molecular genetics and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic model with molecular characterization of mutation, biochemical confirmation of ether lipid depletion, and multiple tissue phenotypes linked to AGPS deficiency\",\n      \"pmids\": [\"21353609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Agps knockout mice show ~85% embryonic lethality; surviving mice exhibit cataracts and testicular abnormalities similar to bs2 hypomorphic mice, confirming that AGPS is required for normal embryonic development and for lens and spermatogenic cell function.\",\n      \"method\": \"Knockout mouse generation (KOMP), survival analysis, clinical and histological phenotyping\",\n      \"journal\": \"Molecular genetics and metabolism reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complete knockout mouse model with defined embryonic lethal and tissue-specific phenotypes, corroborating mechanistic findings from hypomorphic model\",\n      \"pmids\": [\"25197626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Silencing of AGPS in chemotherapy-resistant glioma and hepatic carcinoma cell lines reduces intracellular LPA, LPAe, and PGE2 levels, decreases LPA receptor- and EP receptor-mediated PI3K/AKT signaling, and suppresses expression of multi-drug resistance genes (MDR1, MRP1, ABCG2), leading to increased drug sensitivity, cell cycle arrest, and apoptosis.\",\n      \"method\": \"siRNA knockdown in U87MG/DDP and HepG2/ADM cell lines, lipid measurement, Western blotting for signaling pathway components and MDR genes, cell proliferation and apoptosis assays\",\n      \"journal\": \"Asian Pacific journal of cancer prevention\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined lipid-signaling and drug-resistance phenotypes, single lab, multiple readouts\",\n      \"pmids\": [\"24815474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Small-molecule AGPS inhibitors identified by screening bind to distinct portions of the AGPS active site (structurally characterized), selectively lower ether lipid levels in human cancer cells, and impair cancer cell survival and migration, confirming AGPS enzymatic activity as pharmacologically targetable.\",\n      \"method\": \"Small-molecule screen, structural characterization of inhibitor-enzyme interactions (crystallography implied), ether lipid profiling by mass spectrometry, cell viability and migration assays in cancer cells\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural characterization of inhibitor binding to active site combined with functional in-cell lipid and phenotypic readouts, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"26322624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AGPS interacts with HNRNPK as identified by co-immunoprecipitation and mass spectrometry in glioma cells; co-localization confirmed in the cellular nucleus by confocal microscopy. HNRNPK can reverse the suppression of cell proliferation and ether lipid secretion caused by AGPS silencing, placing HNRNPK downstream or in a compensatory pathway relative to AGPS.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, Western blot, confocal laser microscopy, AGPS silencing followed by HNRNPK rescue in glioma cell lines\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reciprocal Co-IP plus MS identification and rescue experiment, but single lab and nuclear co-localization of a peroxisomal enzyme with an RNA-binding protein is biologically unusual; moderate caution warranted\",\n      \"pmids\": [\"34621897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AGPS is ubiquitinated and degraded via the proteasomal pathway by the E3 ubiquitin ligase MDM2. The kinase TrkA phosphorylates AGPS at Y451, promoting the AGPS–MDM2 interaction and thus accelerating AGPS degradation. TrkA inhibition (with larotrectinib) increases AGPS levels, sensitizes prostate cancer cells to ferroptosis, and inhibits tumor growth in vivo.\",\n      \"method\": \"Co-immunoprecipitation and GST pull-down (in vivo and in vitro), label-free mass spectrometry, site-directed mutagenesis (Y451), cell viability/colony formation assays, xenograft tumor model\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution (GST pull-down), Co-IP, mutagenesis of phosphorylation site, and in vivo xenograft validation; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"38200609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The AGPS 5'UTR regulatory variant rs113671272 exhibits allele-specific binding to transcription factor MEIS3; MEIS3 knockdown suppresses AGPS expression. AGPS knockdown inhibits ESCC cell proliferation, migration, and tumor growth, while overexpression promotes oncogenic phenotypes via NF-κB activation, defining a MEIS3/AGPS/NF-κB regulatory axis.\",\n      \"method\": \"CUT&Tag-qPCR, EMSA (electrophoretic mobility shift assay), RNA interference, xenograft tumors, transcriptomic profiling, Western blotting\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and CUT&Tag confirm allele-specific TF binding; functional rescue and pathway analysis from single lab with multiple orthogonal methods\",\n      \"pmids\": [\"41950565\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AGPS (alkylglyceronephosphate synthase) is a peroxisomal FAD-containing enzyme that catalyzes the key step in ether lipid (plasmalogen and alkyl-glycerophospholipid) biosynthesis by forming the ether bond; it is imported into the peroxisome by PEX7 and partners with GNPAT for substrate channeling, is regulated post-translationally by TrkA-mediated phosphorylation at Y451 that promotes MDM2-dependent ubiquitination and proteasomal degradation, and controls the balance of structural and oncogenic signaling lipids (LPA, LPAe, PGE2) to sustain cancer cell survival, drug resistance, and tumor growth via PI3K/AKT and NF-κB signaling; loss of AGPS in mice causes embryonic lethality, cataracts, and male sterility due to ether lipid depletion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AGPS (alkylglyceronephosphate synthase) is the peroxisomal enzyme that catalyzes a committed step in ether lipid biosynthesis, and its activity governs the cellular pool of structural and signaling ether lipids that sustain cancer cell survival and tumor growth [#0]. Within the peroxisome, AGPS is imported by PEX7 and functions in partnership with GNPAT on the luminal membrane surface, where its presence is required for full GNPAT activity and substrate channeling into plasmalogen synthesis; AGPS mutations that disrupt this partnership cause rhizomelic chondrodysplasia punctata type 3 (RCDP3) [#1]. In mice, hypomorphic disruption that deletes the FAD enzymatic domain and complete knockout both deplete ether lipids and produce cataracts, male sterility, and substantial embryonic lethality, establishing AGPS as essential for development, lens fiber, and spermatogenic cell function [#2, #3]. In cancer, loss of AGPS lowers oncogenic signaling lipids including LPA, LPAe, and prostaglandins, attenuating LPA- and EP-receptor-driven PI3K/AKT signaling and multidrug-resistance gene expression, while pharmacological inhibitors that bind the AGPS active site selectively reduce ether lipids and impair cancer cell survival and migration [#0, #4, #5]. AGPS is regulated post-translationally: TrkA phosphorylates AGPS at Y451 to promote MDM2-mediated ubiquitination and proteasomal degradation, and blocking this axis raises AGPS levels and sensitizes prostate cancer cells to ferroptosis [#7]. Transcriptionally, a MEIS3/AGPS/NF-\\u03baB axis drives oncogenic phenotypes in esophageal squamous cell carcinoma [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established how AGPS is delivered to its site of action and that it does not act alone, defining the peroxisomal import route and the enzymatic partnership underlying plasmalogen synthesis.\",\n      \"evidence\": \"Patient-derived cell-line protein quantification, structural modeling of AGPS mutations, and transcript analysis comparing AGPS and GNPAT\",\n      \"pmids\": [\"21990100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate channeling inferred from protein-level interdependence rather than reconstituted enzymatic assay\", \"Stoichiometry and structural basis of the AGPS\\u2013GNPAT complex not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated in vivo that AGPS enzymatic activity is required for ether lipid production and identified the organismal consequences of its loss, linking the FAD domain to lens and spermatogenic phenotypes.\",\n      \"evidence\": \"Genetic mapping, transcript characterization, lipid mass spectrometry, and histology in hypomorphic bs2 mice\",\n      \"pmids\": [\"21353609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hypomorphic allele leaves residual function, complicating null interpretation\", \"Mechanism linking ether lipid depletion to specific lens/testis cell pathology not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected AGPS-dependent ether lipid synthesis to oncogenic lipid signaling, showing that AGPS controls levels of LPA, LPAe, and prostaglandins required for cancer cell survival and tumor growth.\",\n      \"evidence\": \"siRNA/shRNA ablation across multiple cancer cell lines and xenografts with lipidomic profiling\",\n      \"pmids\": [\"23980144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish which downstream lipid species is rate-limiting for the phenotype\", \"Direct receptor-level signaling consequences not measured here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Confirmed AGPS is required for normal development using a complete knockout, extending the hypomorphic phenotypes to embryonic lethality.\",\n      \"evidence\": \"KOMP knockout mouse, survival analysis, and histological phenotyping\",\n      \"pmids\": [\"25197626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cause of embryonic lethality at the cellular/pathway level not determined\", \"Tissue-autonomous requirements not dissected\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked AGPS to chemoresistance by mapping lipid changes to PI3K/AKT signaling and multidrug-resistance gene expression in resistant tumor cells.\",\n      \"evidence\": \"siRNA knockdown in chemoresistant glioma and hepatic carcinoma lines with lipid measurement, signaling Western blots, and proliferation/apoptosis assays\",\n      \"pmids\": [\"24815474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study with two cell lines\", \"Causality between specific lipids and MDR gene regulation not isolated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Validated AGPS as a druggable enzyme by identifying active-site-binding small molecules that phenocopy genetic ablation, establishing therapeutic tractability.\",\n      \"evidence\": \"Small-molecule screen, structural characterization of inhibitor binding, ether lipid profiling, and viability/migration assays in cancer cells\",\n      \"pmids\": [\"26322624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Inhibitor selectivity and potency in vivo not established here\", \"Full enzyme structure with bound substrate not reported\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified HNRNPK as an AGPS interactor that can rescue AGPS-silencing phenotypes, introducing a possible compensatory or downstream node.\",\n      \"evidence\": \"Co-immunoprecipitation, mass spectrometry, confocal co-localization, and rescue in glioma cells\",\n      \"pmids\": [\"34621897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reported nuclear co-localization of a peroxisomal enzyme with an RNA-binding protein is biologically unusual and not mechanistically explained\", \"Single lab; functional relationship to ether lipid synthesis unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined post-translational control of AGPS, showing TrkA-mediated Y451 phosphorylation drives MDM2-dependent proteasomal degradation and links AGPS stability to ferroptosis sensitivity.\",\n      \"evidence\": \"Co-IP, in vitro GST pull-down, label-free MS, Y451 site-directed mutagenesis, and prostate cancer xenografts with larotrectinib\",\n      \"pmids\": [\"38200609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic link between AGPS levels and ferroptosis not fully resolved\", \"Whether degradation regulates ether lipid flux quantitatively not measured\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established transcriptional regulation of AGPS through an allele-specific MEIS3 binding event, defining a MEIS3/AGPS/NF-\\u03baB oncogenic axis in ESCC.\",\n      \"evidence\": \"CUT&Tag-qPCR, EMSA, RNA interference, xenografts, and transcriptomic profiling\",\n      \"pmids\": [\"41950565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Mechanism by which AGPS activates NF-\\u03baB not biochemically defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AGPS's peroxisomal enzymatic output is mechanistically coupled to nuclear/transcriptional partners (HNRNPK, NF-\\u03baB) and how its post-translational and transcriptional regulation integrate to control ether lipid flux in vivo remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking ether lipid production to nuclear signaling effects\", \"Substrate-bound enzyme structure and catalytic mechanism not reported in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 4, 7, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GNPAT\", \"PEX7\", \"MDM2\", \"TrkA\", \"HNRNPK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}