{"gene":"GPX1","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1997,"finding":"The Gpx1 gene encodes both cytosolic and mitochondrial glutathione peroxidase in mouse liver; mitochondrial GPX activity was completely absent in Gpx1-knockout mice, establishing that mitochondrial GPX is a product of the Gpx1 gene.","method":"Subcellular fractionation (Percoll gradient), enzymatic activity assay in Gpx1 knockout vs. wild-type mice","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with direct biochemical readout; specific fractionation confirmed mitochondrial localization","pmids":["9126277"],"is_preprint":false},{"year":1998,"finding":"GPX1 protects cells against oxidative stress caused by paraquat and H2O2; Gpx1-/- mice showed dramatically increased lethality to paraquat and cortical neurons from Gpx1-/- mice were more susceptible to H2O2-induced death.","method":"Loss-of-function (Gpx1 knockout mouse), in vivo oxidant challenge (paraquat, H2O2), primary neuron culture","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — KO with defined phenotypic readout, replicated across multiple oxidant challenges and cell types","pmids":["9712879"],"is_preprint":false},{"year":2001,"finding":"GPX1 gene delivery (adenoviral GPx-1 overexpression) suppresses H2O2-mediated NF-κB activation preferentially through inhibition of IKKα but not IKKβ, linking GPX1-mediated H2O2 clearance to a specific subunit of the IKK complex.","method":"Adenoviral overexpression of GPx-1 and dominant-negative IKKα/IKKβ constructs, NF-κB reporter assay, EMSA","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 — overexpression with dominant-negative epistasis, single lab","pmids":["11491654"],"is_preprint":false},{"year":2004,"finding":"GPX1 overexpression in MCF-7 cells decreases site-specific Akt phosphorylation, increases Gadd45 levels, and affects p70S6K phosphorylation without affecting ERK1/2 or p38 MAPK, placing GPX1 in the PI3K-Akt survival signaling pathway.","method":"Stable transfection (GPx-1 overexpression), western blotting for phosphoprotein levels","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 3 — overexpression with biochemical readout, single lab, single method","pmids":["15203190"],"is_preprint":false},{"year":2004,"finding":"Fibroblasts from Gpx1-/- mice display senescence-like features including reduced proliferative capacity, elevated Cip1, increased NF-κB activation, and increased susceptibility to H2O2-induced apoptosis, demonstrating that GPX1 protects against ROS-mediated senescence and cell death.","method":"Primary fibroblasts from Gpx1 knockout mice, proliferation assays, apoptosis assay, NF-κB reporter","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — KO cells with multiple orthogonal phenotypic readouts, single lab","pmids":["14732290"],"is_preprint":false},{"year":2005,"finding":"Loss of Gpx1 in neurons leads to diminished Akt phosphorylation (PI3K-Akt pathway) following H2O2 treatment and after cerebral ischemia-reperfusion, mechanistically linking GPX1 to neuronal survival via the PI3K-Akt pathway.","method":"Primary neurons from Gpx1-/- mice, H2O2 challenge, PI3K inhibitor (LY294002) treatment, western blot for phospho-Akt, MCAO model","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — KO neurons + pharmacological epistasis, in vitro and in vivo, single lab","pmids":["15663476"],"is_preprint":false},{"year":2005,"finding":"Homocysteine decreases GPX1 activity by impairing the translational selenocysteine-insertion (UGA read-through) mechanism, without affecting GPX1 mRNA levels; the effect is mediated through the SECIS element in the 3'-UTR of GPX1 mRNA.","method":"SECIS-luciferase reporter assay, enzymatic activity assay, western blot, metabolic manipulation of homocysteine using folate antagonist","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted reporter system with multiple orthogonal methods (reporter, enzymatic assay, western), clear translational mechanism","pmids":["15734734"],"is_preprint":false},{"year":2005,"finding":"GPX1 overexpression in endothelial cells reduces Bax protein and mRNA levels (without changing p53 or Bcl-2), lowering the Bax/Bcl-2 apoptotic ratio in the absence of exogenous oxidant stress.","method":"Stable transfection, quantitative RT-PCR, western blot","journal":"Molecular and cellular biochemistry","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single overexpression approach, limited mechanistic follow-up","pmids":["16132718"],"is_preprint":false},{"year":2009,"finding":"GPX1 is modified with O-linked N-acetylglucosamine (O-GlcNAc) on its C-terminus under hyperglycemic conditions; this O-GlcNAcylation is required for GPX1 activation and for GPX1 binding to c-Abl and Arg kinases.","method":"Co-immunoprecipitation, O-GlcNAcase inhibitor (NTZ) injection, enzymatic activity assay, glycosylation analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with kinases, in vivo pharmacological validation, post-translational modification identified","pmids":["19944066"],"is_preprint":false},{"year":2011,"finding":"Knockout of SOD1 promotes conversion of the active-site selenocysteine (Sec) of hepatic GPX1 to dehydroalanine (DHA), reducing apparent kcat and GPX1 activity, revealing in vivo functional dependence of GPX1 on SOD1 through an oxidative active-site modification.","method":"Mass spectrometry of GPX1 active-site residue in SOD1-/- mice, in vitro kinetics, tetramer structure analysis","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 1 — mass spectrometry active-site characterization, in vitro kinetics, and structural analysis in KO model","pmids":["21420488"],"is_preprint":false},{"year":2011,"finding":"Naked mole rats have drastically reduced GPX1 expression due to an early stop codon in the GPX1 gene and defective SECIS/mRNA function, resulting in reduced selenium utilization in liver and kidney; GPX1 knockout mice similarly show reduced selenium in these tissues, establishing GPX1 as a major selenium-utilizing enzyme.","method":"Transcriptome sequencing, heterologous expression in HEK293 cells, 75Se metabolic labeling, x-ray fluorescence microscopy, GPX1 KO mouse analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods (sequencing, heterologous expression, metabolic labeling, elemental imaging, KO model)","pmids":["21372135"],"is_preprint":false},{"year":2012,"finding":"Transcription factor ZNF143 upregulates GPX1 activity in mitochondrial respiratory-defective cells; ZNF143 knockdown reduces GPX1 activity, and ZNF143 also activates the selenocysteine synthesis pathway (SepSecS expression), promoting cell survival under oxidative stress.","method":"ZNF143 and GPX1 knockdown (siRNA), GPX activity assay, gene expression analysis, cisplatin sensitivity assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — dual knockdown with enzymatic activity readout, single lab","pmids":["23152058"],"is_preprint":false},{"year":2012,"finding":"TFAP2C transcription factor directly binds an AP-2 regulatory element in the GPX1 promoter and activates GPX1 transcription; CpG methylation of this AP-2 site blocks TFAP2C binding and silences GPX1; demethylation with 5-aza-dC restores TFAP2C binding and GPX1 expression.","method":"ChIP-seq, TFAP2C knockdown, 5'-aza-dC treatment, GPX activity assay, methylation analysis of primary tumors","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq, knockdown, demethylation rescue, and activity assay provide multiple orthogonal lines of evidence","pmids":["22964634"],"is_preprint":false},{"year":2014,"finding":"mTOR pathway activity regulates GPX1 (and GPX4) at the translational level; rapamycin (mTOR inhibitor) increases GPX1 protein levels without altering mRNA, indicating mTOR suppresses GPX1 translation.","method":"Rapamycin treatment of CML cell lines, western blot, mRNA quantification","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological inhibition with matched protein/mRNA measurements, single lab","pmids":["24691473"],"is_preprint":false},{"year":2016,"finding":"CUEDC2 promotes TRIM33-mediated ubiquitination and proteasomal degradation of GPX1 in cardiomyocytes; Cuedc2 knockout increases GPX1 protein levels, enhances ROS scavenging, and protects against ischemia/reperfusion injury.","method":"Cuedc2 knockout mice, Co-IP (CUEDC2-TRIM33-GPX1 interaction), ubiquitination assay, I/R injury model","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay, KO with in vivo functional readout; multiple orthogonal methods","pmids":["27286733"],"is_preprint":false},{"year":2020,"finding":"PER1 physically interacts with GPX1 in the cytoplasm and enhances GPX1 activity; Per1-deficient mice show deregulated GPX-related ROS fluctuations and impaired mitochondrial oxidative phosphorylation efficiency, placing PER1 as a regulator of GPX1-dependent redox homeostasis.","method":"Co-immunoprecipitation (PER1/GPX1), Per1 knockout mice, GPX activity assay, oxygen consumption measurement, mitochondrial function assay","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP plus KO phenotype, single lab","pmids":["32896721"],"is_preprint":false},{"year":2022,"finding":"DNMT2-mediated DNA methylation of the GPX1 promoter suppresses GPX1 expression in AGE-exposed cardiomyocytes; selenium supplementation reduces DNMT2 expression, decreases GPX1 promoter methylation, restores GPX1 activity, and alleviates ROS-mediated apoptosis.","method":"Bisulfite sequencing, DNMT inhibitor (AZA), selenium supplementation, western blot, GPX activity assay, cardiac function assessment in rats","journal":"Oxidative medicine and cellular longevity","confidence":"Medium","confidence_rationale":"Tier 2 — bisulfite sequencing, pharmacological rescue, in vivo model; single lab","pmids":["35432721"],"is_preprint":false},{"year":2022,"finding":"The splicing factor NONO binds a consensus motif in the intron of GPX1 pre-mRNA (in association with PSPC1) and promotes correct splicing; NONO knockdown causes GPX1 intron retention, reducing functional GPX1 and impairing redox homeostasis in glioblastoma cells.","method":"RIP-PCR, RNA pulldown, RNA sequencing, NONO knockdown/overexpression, JC-1 staining, Seahorse assay","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 2 — RIP-PCR, RNA pulldown, transcriptome-wide sequencing, and functional redox assays in multiple cell models","pmids":["35910786"],"is_preprint":false},{"year":2023,"finding":"HIF-1α binds the GPX1 promoter under hypoxic conditions to induce GPX1 expression; GPX1 depletion under hypoxia leads to H2O2 overload and apoptosis in glioblastoma; exosomal GPX1 additionally protects neighboring endothelial cells from H2O2- or radiation-induced apoptosis.","method":"ChIP (HIF-1α/GPX1 promoter), GPX1 knockdown, H2O2 measurement, xenograft model, exosome characterization","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus KO with functional readout, in vivo validation; single lab","pmids":["37572455"],"is_preprint":false},{"year":2024,"finding":"GPX1 undergoes S-palmitoylation at cysteine-76 and cysteine-113; the depalmitoylase PPT1 promotes GPX1 depalmitoylation and reduces GPX1 protein stability. Inhibiting palmitoylation (or expressing PPT1) enhances angiogenesis, while PPT1 deficiency attenuates pathological angiogenesis, establishing a PPT1-GPX1 palmitoylation axis regulating angiogenesis.","method":"Site-directed mutagenesis (C76/C113 non-palmitoylatable mutants), PPT1 knockout mice (OIR model), PPT1 inhibitor (DC661), protein stability assay","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 — active-site mutagenesis, KO mouse model, pharmacological intervention, in vivo disease model","pmids":["39423458"],"is_preprint":false}],"current_model":"GPX1 is a selenocysteine-containing antioxidant enzyme that reduces H2O2 and lipid peroxides using glutathione; it localizes to both cytosol and mitochondria (encoded by a single Gpx1 gene), is transcriptionally regulated by TFAP2C (blocked by promoter CpG methylation) and HIF-1α, translationally regulated via selenocysteine-insertion (SECIS-dependent UGA read-through) that is suppressed by homocysteine and enhanced by mTOR inhibition, post-translationally controlled by O-GlcNAcylation (activating, enabling interaction with c-Abl/Arg kinases), S-palmitoylation (at C76/C113, stabilizing the protein, modulated by PPT1), and ubiquitin-proteasomal degradation (via CUEDC2-TRIM33); its active-site selenocysteine is susceptible to oxidative conversion to dehydroalanine (promoted by SOD1 deficiency); it suppresses NF-κB activation via preferential inhibition of IKKα, sustains PI3K-Akt pro-survival signaling in neurons, and physically interacts with PER1 to regulate circadian-linked mitochondrial redox homeostasis."},"narrative":{"teleology":[{"year":1997,"claim":"Establishing that cytosolic and mitochondrial GPX activities arise from the same gene resolved the question of whether separate genes encoded compartment-specific isoforms.","evidence":"Subcellular fractionation and GPX activity assays in Gpx1 knockout versus wild-type mouse liver","pmids":["9126277"],"confidence":"High","gaps":["Mechanism of GPX1 dual targeting (mitochondrial import signal usage) not characterized","Relative contribution of mitochondrial vs. cytosolic pools to antioxidant defense not quantified"]},{"year":1998,"claim":"Demonstrating that Gpx1 knockout mice are hypersensitive to paraquat and H2O2 established GPX1 as a physiologically essential antioxidant enzyme in vivo.","evidence":"Gpx1 knockout mice challenged with paraquat (lethality) and primary cortical neurons treated with H2O2 (cell death)","pmids":["9712879"],"confidence":"High","gaps":["Relative contribution of GPX1 versus other peroxidases (GPX4, catalase, peroxiredoxins) not delineated","Tissue-specific vulnerability to GPX1 loss not systematically mapped"]},{"year":2001,"claim":"Linking GPX1 to NF-κB suppression via selective IKKα inhibition revealed a specific signaling node downstream of H2O2 clearance, beyond bulk ROS detoxification.","evidence":"Adenoviral GPX1 overexpression with dominant-negative IKKα/IKKβ, NF-κB reporter and EMSA","pmids":["11491654"],"confidence":"Medium","gaps":["Direct physical interaction between GPX1 and IKKα not demonstrated","Whether GPX1 modifies a specific cysteine on IKKα is unknown"]},{"year":2005,"claim":"Showing that Gpx1 knockout neurons have diminished Akt phosphorylation after oxidative challenge and ischemia-reperfusion placed GPX1 upstream of the PI3K-Akt survival axis in the brain.","evidence":"Primary Gpx1−/− neurons, H2O2 challenge, PI3K inhibitor epistasis, phospho-Akt western blot, MCAO ischemia model","pmids":["15663476"],"confidence":"Medium","gaps":["Whether GPX1 acts directly on a PI3K/PTEN redox switch or indirectly via bulk peroxide clearance is unresolved","Overexpression studies in MCF-7 showed opposite direction on Akt, raising context-dependency questions"]},{"year":2005,"claim":"Identifying homocysteine as a translational suppressor of GPX1 through impaired SECIS-dependent selenocysteine insertion revealed a metabolite-level regulatory mechanism linking one-carbon metabolism to selenoprotein production.","evidence":"SECIS-luciferase reporter, enzymatic activity assay, western blot, folate antagonist to raise homocysteine","pmids":["15734734"],"confidence":"High","gaps":["Identity of the molecular target of homocysteine within the SECIS/translational machinery not pinpointed","In vivo relevance in hyperhomocysteinemic patients not confirmed"]},{"year":2009,"claim":"Discovery that O-GlcNAcylation of GPX1 is required for enzymatic activation and for binding c-Abl/Arg kinases established a post-translational switch linking glucose metabolism to antioxidant capacity.","evidence":"Co-immunoprecipitation, O-GlcNAcase inhibitor injection, GPX activity assay, glycosylation analysis","pmids":["19944066"],"confidence":"Medium","gaps":["Exact O-GlcNAcylated residue(s) not mapped","Functional consequence of c-Abl/Arg binding on GPX1 activity or localization not determined"]},{"year":2011,"claim":"Demonstrating that SOD1 deficiency causes oxidative conversion of the GPX1 active-site selenocysteine to dehydroalanine revealed a direct chemical interdependence between the two antioxidant enzymes.","evidence":"Mass spectrometry of GPX1 active-site residue in Sod1−/− mice, kinetic analysis, tetramer structure","pmids":["21420488"],"confidence":"High","gaps":["Whether superoxide itself or a downstream oxidant mediates the Sec-to-DHA conversion is unclear","Reversibility of the modification and potential repair mechanisms not explored"]},{"year":2012,"claim":"Identifying TFAP2C as a direct transcriptional activator of GPX1 whose binding is abolished by CpG methylation provided a mechanism for epigenetic silencing of GPX1 in cancer.","evidence":"ChIP-seq, TFAP2C knockdown, 5-aza-dC demethylation rescue, GPX activity assay, primary tumor methylation analysis","pmids":["22964634"],"confidence":"High","gaps":["Which DNA methyltransferase(s) deposit the silencing mark at the AP-2 site in vivo not fully established (DNMT2 implicated later in a specific context)","Whether TFAP2C is the dominant transcription factor for GPX1 in non-tumor tissues unknown"]},{"year":2014,"claim":"Showing that mTOR inhibition increases GPX1 protein without changing mRNA identified an additional translational control layer, distinct from SECIS/homocysteine regulation.","evidence":"Rapamycin treatment of CML cells, western blot vs. mRNA quantification","pmids":["24691473"],"confidence":"Medium","gaps":["Whether mTOR regulates GPX1 translation via 4E-BP/eIF4E, S6K, or through SECIS-binding factors is unresolved","Generalizability beyond CML cell lines not tested"]},{"year":2016,"claim":"Identification of a CUEDC2–TRIM33 axis that ubiquitinates GPX1 for proteasomal degradation established a targeted proteolytic control mechanism with pathophysiological relevance in cardiac ischemia-reperfusion injury.","evidence":"Cuedc2 knockout mice, Co-IP of CUEDC2–TRIM33–GPX1 complex, ubiquitination assay, ischemia-reperfusion injury model","pmids":["27286733"],"confidence":"High","gaps":["Specific ubiquitinated lysine(s) on GPX1 not mapped","Whether TRIM33 is the sole E3 ligase for GPX1 is unknown"]},{"year":2020,"claim":"Demonstration that PER1 physically interacts with GPX1 and enhances its activity connected the circadian clock to mitochondrial redox oscillations.","evidence":"Reciprocal Co-IP of PER1–GPX1, Per1 knockout mice, GPX activity assay, mitochondrial oxygen consumption measurement","pmids":["32896721"],"confidence":"Medium","gaps":["Structural basis of PER1–GPX1 interaction unknown","Whether the interaction is direct or mediated by a bridging partner not resolved","Circadian oscillation of GPX1 activity not measured with temporal resolution"]},{"year":2022,"claim":"Discovery that NONO binds GPX1 pre-mRNA intron and promotes correct splicing (with PSPC1) added a splicing-level regulatory layer; NONO loss causes intron retention and functional GPX1 deficiency.","evidence":"RIP-PCR, RNA pulldown, RNA sequencing, NONO knockdown/overexpression, Seahorse assay in glioblastoma cells","pmids":["35910786"],"confidence":"High","gaps":["Sequence specificity of the NONO-binding motif in GPX1 intron not fully defined","Whether this splicing regulation operates in non-cancer cell types unknown"]},{"year":2023,"claim":"Showing that HIF-1α directly binds the GPX1 promoter under hypoxia to induce expression revealed how GPX1 is upregulated in the hypoxic tumor microenvironment; exosomal GPX1 transfer to endothelial cells extended GPX1 function beyond cell-autonomous antioxidant defense.","evidence":"ChIP of HIF-1α at GPX1 promoter, GPX1 knockdown, H2O2 measurement, xenograft model, exosome characterization","pmids":["37572455"],"confidence":"Medium","gaps":["Relative contribution of HIF-1α vs. TFAP2C to GPX1 transcription under normoxic vs. hypoxic conditions not compared","Mechanism of GPX1 sorting into exosomes not elucidated"]},{"year":2024,"claim":"Identification of S-palmitoylation at C76 and C113 as a stabilizing modification, reversed by PPT1 depalmitoylase, established a lipid-modification axis controlling GPX1 turnover with functional impact on pathological angiogenesis.","evidence":"Site-directed mutagenesis of C76/C113, PPT1 knockout mice (OIR model), PPT1 inhibitor DC661, protein stability assay","pmids":["39423458"],"confidence":"High","gaps":["Which palmitoyl acyltransferase(s) modify GPX1 is unknown","How palmitoylation and O-GlcNAcylation are coordinated on the same protein not explored"]},{"year":null,"claim":"A unified structural and kinetic model integrating the multiple post-translational modifications (O-GlcNAcylation, S-palmitoylation, ubiquitination, Sec-to-DHA conversion) and their crosstalk on GPX1 activity and stability remains to be constructed.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of human GPX1 with mapped PTM sites exists","Quantitative hierarchy among transcriptional (TFAP2C, HIF-1α), translational (SECIS, mTOR), splicing (NONO), and post-translational controls not established","Cell-type-specific integration of these regulatory layers not systematically characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016209","term_label":"antioxidant activity","supporting_discovery_ids":[0,1,9,10]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,1,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,15]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,15]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,5]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,7]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[15]}],"complexes":[],"partners":["CUEDC2","TRIM33","PER1","PPT1","ABL1","ARG","NONO","PSPC1"],"other_free_text":[]},"mechanistic_narrative":"GPX1 is a selenocysteine-containing glutathione peroxidase that serves as a primary intracellular scavenger of hydrogen peroxide and organic hydroperoxides, protecting cells against oxidative stress-induced apoptosis, senescence, and ischemia-reperfusion injury [PMID:9712879, PMID:14732290, PMID:27286733]. Encoded by a single gene that supplies both cytosolic and mitochondrial pools [PMID:9126277], GPX1 modulates downstream signaling by suppressing NF-κB activation through preferential inhibition of IKKα [PMID:11491654] and sustaining PI3K-Akt pro-survival signaling in neurons [PMID:15663476]. GPX1 expression is controlled transcriptionally by TFAP2C and HIF-1α (with promoter CpG methylation acting as a silencer) [PMID:22964634, PMID:37572455], translationally through SECIS-dependent selenocysteine insertion that is suppressed by homocysteine and enhanced by mTOR inhibition [PMID:15734734, PMID:24691473], at the splicing level by NONO/PSPC1 [PMID:35910786], and post-translationally by O-GlcNAcylation (activating, enabling c-Abl/Arg interaction), S-palmitoylation at C76/C113 (stabilizing, opposed by PPT1), and CUEDC2–TRIM33-mediated ubiquitin-proteasomal degradation [PMID:19944066, PMID:39423458, PMID:27286733]."},"prefetch_data":{"uniprot":{"accession":"P07203","full_name":"Glutathione peroxidase 1","aliases":["Cellular glutathione peroxidase","Phospholipid-hydroperoxide glutathione peroxidase GPX1"],"length_aa":203,"mass_kda":22.1,"function":"Catalyzes the reduction of hydroperoxides in a glutathione-dependent manner thus regulating cellular redox homeostasis (PubMed:11115402, PubMed:36608588). Can reduce small soluble hydroperoxides such as H2O2, cumene hydroperoxide and tert-butyl hydroperoxide, as well as several fatty acid-derived hydroperoxides (PubMed:11115402, PubMed:36608588). In platelets catalyzes the reduction of 12-hydroperoxyeicosatetraenoic acid, the primary product of the arachidonate 12-lipoxygenase pathway (PubMed:11115402)","subcellular_location":"Cytoplasm; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P07203/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GPX1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GPX1","total_profiled":1310},"omim":[{"mim_id":"621026","title":"RING FINGER PROTEIN 182; RNF182","url":"https://www.omim.org/entry/621026"},{"mim_id":"620198","title":"THYROID HORMONE METABOLISM, ABNORMAL, 3; THMA3","url":"https://www.omim.org/entry/620198"},{"mim_id":"619597","title":"tRNA SELENOCYSTEINE 1-ASSOCIATED PROTEIN 1; TRNAU1AP","url":"https://www.omim.org/entry/619597"},{"mim_id":"614164","title":"GLUTATHIONE PEROXIDASE DEFICIENCY; GPXD","url":"https://www.omim.org/entry/614164"},{"mim_id":"611802","title":"MIGRATION AND INVASION ENHANCER 1; MIEN1","url":"https://www.omim.org/entry/611802"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GPX1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P07203","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07203","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GPX1","jax_strain_url":"https://www.jax.org/strain/search?query=GPX1"},"sequence":{"accession":"P07203","fasta_url":"https://rest.uniprot.org/uniprotkb/P07203.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07203/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07203"}},"corpus_meta":[{"pmid":"9712879","id":"PMC_9712879","title":"Mice with a homozygous null mutation for the most abundant glutathione peroxidase, Gpx1, show increased susceptibility to the oxidative stress-inducing agents paraquat and hydrogen peroxide.","date":"1998","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9712879","citation_count":353,"is_preprint":false},{"pmid":"28089078","id":"PMC_28089078","title":"hucMSC Exosome-Derived GPX1 Is Required for the Recovery of Hepatic Oxidant Injury.","date":"2017","source":"Molecular therapy : the journal of the American Society of Gene Therapy","url":"https://pubmed.ncbi.nlm.nih.gov/28089078","citation_count":263,"is_preprint":false},{"pmid":"14871826","id":"PMC_14871826","title":"Bacteria-induced intestinal cancer in mice with disrupted Gpx1 and Gpx2 genes.","date":"2004","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/14871826","citation_count":239,"is_preprint":false},{"pmid":"11518697","id":"PMC_11518697","title":"Mice with combined disruption of Gpx1 and Gpx2 genes have colitis.","date":"2001","source":"American journal of physiology. Gastrointestinal and liver physiology","url":"https://pubmed.ncbi.nlm.nih.gov/11518697","citation_count":233,"is_preprint":false},{"pmid":"16287877","id":"PMC_16287877","title":"Associations between GPX1 Pro198Leu polymorphism, erythrocyte GPX activity, alcohol consumption and breast cancer risk in a prospective cohort study.","date":"2005","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/16287877","citation_count":178,"is_preprint":false},{"pmid":"11545230","id":"PMC_11545230","title":"Targeted mutation of the gene for cellular glutathione peroxidase (Gpx1) increases noise-induced hearing loss in mice.","date":"2000","source":"Journal of the Association for Research in Otolaryngology : JARO","url":"https://pubmed.ncbi.nlm.nih.gov/11545230","citation_count":168,"is_preprint":false},{"pmid":"9126277","id":"PMC_9126277","title":"The Gpx1 gene encodes mitochondrial glutathione peroxidase in the mouse liver.","date":"1997","source":"Archives of biochemistry and 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/30518949","citation_count":15,"is_preprint":false},{"pmid":"21637495","id":"PMC_21637495","title":"Dietary carotenoid-rich oil supplementation improves exercise-induced anisocytosis in runners: influences of haptoglobin, MnSOD (Val9Ala), CAT (21A/T) and GPX1 (Pro198Leu) gene polymorphisms in dilutional pseudoanemia (sports anemia).","date":"2010","source":"Genetics and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/21637495","citation_count":15,"is_preprint":false},{"pmid":"37064873","id":"PMC_37064873","title":"Selenium-ruthenium complex blocks H1N1 influenza virus-induced cell damage by activating GPx1/TrxR1.","date":"2023","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/37064873","citation_count":14,"is_preprint":false},{"pmid":"33009206","id":"PMC_33009206","title":"Genetic variations of three important antioxidative enzymes SOD2, CAT, and GPX1 in nonalcoholic steatohepatitis.","date":"2021","source":"Journal of the Chinese Medical Association : JCMA","url":"https://pubmed.ncbi.nlm.nih.gov/33009206","citation_count":14,"is_preprint":false},{"pmid":"38745588","id":"PMC_38745588","title":"Translational selenium nanoparticles boost GPx1 activation to reverse HAdV-14 virus-induced oxidative damage.","date":"2024","source":"Bioactive materials","url":"https://pubmed.ncbi.nlm.nih.gov/38745588","citation_count":13,"is_preprint":false},{"pmid":"30944693","id":"PMC_30944693","title":"Toxicity of DON on GPx1-Overexpressed or Knockdown Porcine Splenic Lymphocytes In Vitro and Protective Effects of Sodium Selenite.","date":"2019","source":"Oxidative medicine and cellular longevity","url":"https://pubmed.ncbi.nlm.nih.gov/30944693","citation_count":13,"is_preprint":false},{"pmid":"15318035","id":"PMC_15318035","title":"No association between the Pro197Leu polymorphism in the glutathione peroxidase (GPX1) gene and schizophrenia.","date":"2004","source":"Psychiatric genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15318035","citation_count":13,"is_preprint":false},{"pmid":"19946932","id":"PMC_19946932","title":"Lack of association of GPX1 and MnSOD genes with symptom severity and response to clozapine treatment in schizophrenia subjects.","date":"2009","source":"Human psychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/19946932","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54400,"output_tokens":4667,"usd":0.116602},"stage2":{"model":"claude-opus-4-6","input_tokens":8201,"output_tokens":3726,"usd":0.201233},"total_usd":0.317835,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"The Gpx1 gene encodes both cytosolic and mitochondrial glutathione peroxidase in mouse liver; mitochondrial GPX activity was completely absent in Gpx1-knockout mice, establishing that mitochondrial GPX is a product of the Gpx1 gene.\",\n      \"method\": \"Subcellular fractionation (Percoll gradient), enzymatic activity assay in Gpx1 knockout vs. wild-type mice\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with direct biochemical readout; specific fractionation confirmed mitochondrial localization\",\n      \"pmids\": [\"9126277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"GPX1 protects cells against oxidative stress caused by paraquat and H2O2; Gpx1-/- mice showed dramatically increased lethality to paraquat and cortical neurons from Gpx1-/- mice were more susceptible to H2O2-induced death.\",\n      \"method\": \"Loss-of-function (Gpx1 knockout mouse), in vivo oxidant challenge (paraquat, H2O2), primary neuron culture\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined phenotypic readout, replicated across multiple oxidant challenges and cell types\",\n      \"pmids\": [\"9712879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GPX1 gene delivery (adenoviral GPx-1 overexpression) suppresses H2O2-mediated NF-κB activation preferentially through inhibition of IKKα but not IKKβ, linking GPX1-mediated H2O2 clearance to a specific subunit of the IKK complex.\",\n      \"method\": \"Adenoviral overexpression of GPx-1 and dominant-negative IKKα/IKKβ constructs, NF-κB reporter assay, EMSA\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — overexpression with dominant-negative epistasis, single lab\",\n      \"pmids\": [\"11491654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GPX1 overexpression in MCF-7 cells decreases site-specific Akt phosphorylation, increases Gadd45 levels, and affects p70S6K phosphorylation without affecting ERK1/2 or p38 MAPK, placing GPX1 in the PI3K-Akt survival signaling pathway.\",\n      \"method\": \"Stable transfection (GPx-1 overexpression), western blotting for phosphoprotein levels\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — overexpression with biochemical readout, single lab, single method\",\n      \"pmids\": [\"15203190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Fibroblasts from Gpx1-/- mice display senescence-like features including reduced proliferative capacity, elevated Cip1, increased NF-κB activation, and increased susceptibility to H2O2-induced apoptosis, demonstrating that GPX1 protects against ROS-mediated senescence and cell death.\",\n      \"method\": \"Primary fibroblasts from Gpx1 knockout mice, proliferation assays, apoptosis assay, NF-κB reporter\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO cells with multiple orthogonal phenotypic readouts, single lab\",\n      \"pmids\": [\"14732290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Loss of Gpx1 in neurons leads to diminished Akt phosphorylation (PI3K-Akt pathway) following H2O2 treatment and after cerebral ischemia-reperfusion, mechanistically linking GPX1 to neuronal survival via the PI3K-Akt pathway.\",\n      \"method\": \"Primary neurons from Gpx1-/- mice, H2O2 challenge, PI3K inhibitor (LY294002) treatment, western blot for phospho-Akt, MCAO model\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO neurons + pharmacological epistasis, in vitro and in vivo, single lab\",\n      \"pmids\": [\"15663476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Homocysteine decreases GPX1 activity by impairing the translational selenocysteine-insertion (UGA read-through) mechanism, without affecting GPX1 mRNA levels; the effect is mediated through the SECIS element in the 3'-UTR of GPX1 mRNA.\",\n      \"method\": \"SECIS-luciferase reporter assay, enzymatic activity assay, western blot, metabolic manipulation of homocysteine using folate antagonist\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted reporter system with multiple orthogonal methods (reporter, enzymatic assay, western), clear translational mechanism\",\n      \"pmids\": [\"15734734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"GPX1 overexpression in endothelial cells reduces Bax protein and mRNA levels (without changing p53 or Bcl-2), lowering the Bax/Bcl-2 apoptotic ratio in the absence of exogenous oxidant stress.\",\n      \"method\": \"Stable transfection, quantitative RT-PCR, western blot\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single overexpression approach, limited mechanistic follow-up\",\n      \"pmids\": [\"16132718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GPX1 is modified with O-linked N-acetylglucosamine (O-GlcNAc) on its C-terminus under hyperglycemic conditions; this O-GlcNAcylation is required for GPX1 activation and for GPX1 binding to c-Abl and Arg kinases.\",\n      \"method\": \"Co-immunoprecipitation, O-GlcNAcase inhibitor (NTZ) injection, enzymatic activity assay, glycosylation analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with kinases, in vivo pharmacological validation, post-translational modification identified\",\n      \"pmids\": [\"19944066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Knockout of SOD1 promotes conversion of the active-site selenocysteine (Sec) of hepatic GPX1 to dehydroalanine (DHA), reducing apparent kcat and GPX1 activity, revealing in vivo functional dependence of GPX1 on SOD1 through an oxidative active-site modification.\",\n      \"method\": \"Mass spectrometry of GPX1 active-site residue in SOD1-/- mice, in vitro kinetics, tetramer structure analysis\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mass spectrometry active-site characterization, in vitro kinetics, and structural analysis in KO model\",\n      \"pmids\": [\"21420488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Naked mole rats have drastically reduced GPX1 expression due to an early stop codon in the GPX1 gene and defective SECIS/mRNA function, resulting in reduced selenium utilization in liver and kidney; GPX1 knockout mice similarly show reduced selenium in these tissues, establishing GPX1 as a major selenium-utilizing enzyme.\",\n      \"method\": \"Transcriptome sequencing, heterologous expression in HEK293 cells, 75Se metabolic labeling, x-ray fluorescence microscopy, GPX1 KO mouse analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (sequencing, heterologous expression, metabolic labeling, elemental imaging, KO model)\",\n      \"pmids\": [\"21372135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Transcription factor ZNF143 upregulates GPX1 activity in mitochondrial respiratory-defective cells; ZNF143 knockdown reduces GPX1 activity, and ZNF143 also activates the selenocysteine synthesis pathway (SepSecS expression), promoting cell survival under oxidative stress.\",\n      \"method\": \"ZNF143 and GPX1 knockdown (siRNA), GPX activity assay, gene expression analysis, cisplatin sensitivity assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dual knockdown with enzymatic activity readout, single lab\",\n      \"pmids\": [\"23152058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TFAP2C transcription factor directly binds an AP-2 regulatory element in the GPX1 promoter and activates GPX1 transcription; CpG methylation of this AP-2 site blocks TFAP2C binding and silences GPX1; demethylation with 5-aza-dC restores TFAP2C binding and GPX1 expression.\",\n      \"method\": \"ChIP-seq, TFAP2C knockdown, 5'-aza-dC treatment, GPX activity assay, methylation analysis of primary tumors\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq, knockdown, demethylation rescue, and activity assay provide multiple orthogonal lines of evidence\",\n      \"pmids\": [\"22964634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"mTOR pathway activity regulates GPX1 (and GPX4) at the translational level; rapamycin (mTOR inhibitor) increases GPX1 protein levels without altering mRNA, indicating mTOR suppresses GPX1 translation.\",\n      \"method\": \"Rapamycin treatment of CML cell lines, western blot, mRNA quantification\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological inhibition with matched protein/mRNA measurements, single lab\",\n      \"pmids\": [\"24691473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CUEDC2 promotes TRIM33-mediated ubiquitination and proteasomal degradation of GPX1 in cardiomyocytes; Cuedc2 knockout increases GPX1 protein levels, enhances ROS scavenging, and protects against ischemia/reperfusion injury.\",\n      \"method\": \"Cuedc2 knockout mice, Co-IP (CUEDC2-TRIM33-GPX1 interaction), ubiquitination assay, I/R injury model\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, KO with in vivo functional readout; multiple orthogonal methods\",\n      \"pmids\": [\"27286733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PER1 physically interacts with GPX1 in the cytoplasm and enhances GPX1 activity; Per1-deficient mice show deregulated GPX-related ROS fluctuations and impaired mitochondrial oxidative phosphorylation efficiency, placing PER1 as a regulator of GPX1-dependent redox homeostasis.\",\n      \"method\": \"Co-immunoprecipitation (PER1/GPX1), Per1 knockout mice, GPX activity assay, oxygen consumption measurement, mitochondrial function assay\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus KO phenotype, single lab\",\n      \"pmids\": [\"32896721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNMT2-mediated DNA methylation of the GPX1 promoter suppresses GPX1 expression in AGE-exposed cardiomyocytes; selenium supplementation reduces DNMT2 expression, decreases GPX1 promoter methylation, restores GPX1 activity, and alleviates ROS-mediated apoptosis.\",\n      \"method\": \"Bisulfite sequencing, DNMT inhibitor (AZA), selenium supplementation, western blot, GPX activity assay, cardiac function assessment in rats\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bisulfite sequencing, pharmacological rescue, in vivo model; single lab\",\n      \"pmids\": [\"35432721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The splicing factor NONO binds a consensus motif in the intron of GPX1 pre-mRNA (in association with PSPC1) and promotes correct splicing; NONO knockdown causes GPX1 intron retention, reducing functional GPX1 and impairing redox homeostasis in glioblastoma cells.\",\n      \"method\": \"RIP-PCR, RNA pulldown, RNA sequencing, NONO knockdown/overexpression, JC-1 staining, Seahorse assay\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RIP-PCR, RNA pulldown, transcriptome-wide sequencing, and functional redox assays in multiple cell models\",\n      \"pmids\": [\"35910786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HIF-1α binds the GPX1 promoter under hypoxic conditions to induce GPX1 expression; GPX1 depletion under hypoxia leads to H2O2 overload and apoptosis in glioblastoma; exosomal GPX1 additionally protects neighboring endothelial cells from H2O2- or radiation-induced apoptosis.\",\n      \"method\": \"ChIP (HIF-1α/GPX1 promoter), GPX1 knockdown, H2O2 measurement, xenograft model, exosome characterization\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus KO with functional readout, in vivo validation; single lab\",\n      \"pmids\": [\"37572455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPX1 undergoes S-palmitoylation at cysteine-76 and cysteine-113; the depalmitoylase PPT1 promotes GPX1 depalmitoylation and reduces GPX1 protein stability. Inhibiting palmitoylation (or expressing PPT1) enhances angiogenesis, while PPT1 deficiency attenuates pathological angiogenesis, establishing a PPT1-GPX1 palmitoylation axis regulating angiogenesis.\",\n      \"method\": \"Site-directed mutagenesis (C76/C113 non-palmitoylatable mutants), PPT1 knockout mice (OIR model), PPT1 inhibitor (DC661), protein stability assay\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — active-site mutagenesis, KO mouse model, pharmacological intervention, in vivo disease model\",\n      \"pmids\": [\"39423458\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GPX1 is a selenocysteine-containing antioxidant enzyme that reduces H2O2 and lipid peroxides using glutathione; it localizes to both cytosol and mitochondria (encoded by a single Gpx1 gene), is transcriptionally regulated by TFAP2C (blocked by promoter CpG methylation) and HIF-1α, translationally regulated via selenocysteine-insertion (SECIS-dependent UGA read-through) that is suppressed by homocysteine and enhanced by mTOR inhibition, post-translationally controlled by O-GlcNAcylation (activating, enabling interaction with c-Abl/Arg kinases), S-palmitoylation (at C76/C113, stabilizing the protein, modulated by PPT1), and ubiquitin-proteasomal degradation (via CUEDC2-TRIM33); its active-site selenocysteine is susceptible to oxidative conversion to dehydroalanine (promoted by SOD1 deficiency); it suppresses NF-κB activation via preferential inhibition of IKKα, sustains PI3K-Akt pro-survival signaling in neurons, and physically interacts with PER1 to regulate circadian-linked mitochondrial redox homeostasis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GPX1 is a selenocysteine-containing glutathione peroxidase that serves as a primary intracellular scavenger of hydrogen peroxide and organic hydroperoxides, protecting cells against oxidative stress-induced apoptosis, senescence, and ischemia-reperfusion injury [PMID:9712879, PMID:14732290, PMID:27286733]. Encoded by a single gene that supplies both cytosolic and mitochondrial pools [PMID:9126277], GPX1 modulates downstream signaling by suppressing NF-κB activation through preferential inhibition of IKKα [PMID:11491654] and sustaining PI3K-Akt pro-survival signaling in neurons [PMID:15663476]. GPX1 expression is controlled transcriptionally by TFAP2C and HIF-1α (with promoter CpG methylation acting as a silencer) [PMID:22964634, PMID:37572455], translationally through SECIS-dependent selenocysteine insertion that is suppressed by homocysteine and enhanced by mTOR inhibition [PMID:15734734, PMID:24691473], at the splicing level by NONO/PSPC1 [PMID:35910786], and post-translationally by O-GlcNAcylation (activating, enabling c-Abl/Arg interaction), S-palmitoylation at C76/C113 (stabilizing, opposed by PPT1), and CUEDC2–TRIM33-mediated ubiquitin-proteasomal degradation [PMID:19944066, PMID:39423458, PMID:27286733].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that cytosolic and mitochondrial GPX activities arise from the same gene resolved the question of whether separate genes encoded compartment-specific isoforms.\",\n      \"evidence\": \"Subcellular fractionation and GPX activity assays in Gpx1 knockout versus wild-type mouse liver\",\n      \"pmids\": [\"9126277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism of GPX1 dual targeting (mitochondrial import signal usage) not characterized\",\n        \"Relative contribution of mitochondrial vs. cytosolic pools to antioxidant defense not quantified\"\n      ]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that Gpx1 knockout mice are hypersensitive to paraquat and H2O2 established GPX1 as a physiologically essential antioxidant enzyme in vivo.\",\n      \"evidence\": \"Gpx1 knockout mice challenged with paraquat (lethality) and primary cortical neurons treated with H2O2 (cell death)\",\n      \"pmids\": [\"9712879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative contribution of GPX1 versus other peroxidases (GPX4, catalase, peroxiredoxins) not delineated\",\n        \"Tissue-specific vulnerability to GPX1 loss not systematically mapped\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Linking GPX1 to NF-κB suppression via selective IKKα inhibition revealed a specific signaling node downstream of H2O2 clearance, beyond bulk ROS detoxification.\",\n      \"evidence\": \"Adenoviral GPX1 overexpression with dominant-negative IKKα/IKKβ, NF-κB reporter and EMSA\",\n      \"pmids\": [\"11491654\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between GPX1 and IKKα not demonstrated\",\n        \"Whether GPX1 modifies a specific cysteine on IKKα is unknown\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing that Gpx1 knockout neurons have diminished Akt phosphorylation after oxidative challenge and ischemia-reperfusion placed GPX1 upstream of the PI3K-Akt survival axis in the brain.\",\n      \"evidence\": \"Primary Gpx1−/− neurons, H2O2 challenge, PI3K inhibitor epistasis, phospho-Akt western blot, MCAO ischemia model\",\n      \"pmids\": [\"15663476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether GPX1 acts directly on a PI3K/PTEN redox switch or indirectly via bulk peroxide clearance is unresolved\",\n        \"Overexpression studies in MCF-7 showed opposite direction on Akt, raising context-dependency questions\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying homocysteine as a translational suppressor of GPX1 through impaired SECIS-dependent selenocysteine insertion revealed a metabolite-level regulatory mechanism linking one-carbon metabolism to selenoprotein production.\",\n      \"evidence\": \"SECIS-luciferase reporter, enzymatic activity assay, western blot, folate antagonist to raise homocysteine\",\n      \"pmids\": [\"15734734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the molecular target of homocysteine within the SECIS/translational machinery not pinpointed\",\n        \"In vivo relevance in hyperhomocysteinemic patients not confirmed\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that O-GlcNAcylation of GPX1 is required for enzymatic activation and for binding c-Abl/Arg kinases established a post-translational switch linking glucose metabolism to antioxidant capacity.\",\n      \"evidence\": \"Co-immunoprecipitation, O-GlcNAcase inhibitor injection, GPX activity assay, glycosylation analysis\",\n      \"pmids\": [\"19944066\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Exact O-GlcNAcylated residue(s) not mapped\",\n        \"Functional consequence of c-Abl/Arg binding on GPX1 activity or localization not determined\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating that SOD1 deficiency causes oxidative conversion of the GPX1 active-site selenocysteine to dehydroalanine revealed a direct chemical interdependence between the two antioxidant enzymes.\",\n      \"evidence\": \"Mass spectrometry of GPX1 active-site residue in Sod1−/− mice, kinetic analysis, tetramer structure\",\n      \"pmids\": [\"21420488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether superoxide itself or a downstream oxidant mediates the Sec-to-DHA conversion is unclear\",\n        \"Reversibility of the modification and potential repair mechanisms not explored\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying TFAP2C as a direct transcriptional activator of GPX1 whose binding is abolished by CpG methylation provided a mechanism for epigenetic silencing of GPX1 in cancer.\",\n      \"evidence\": \"ChIP-seq, TFAP2C knockdown, 5-aza-dC demethylation rescue, GPX activity assay, primary tumor methylation analysis\",\n      \"pmids\": [\"22964634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which DNA methyltransferase(s) deposit the silencing mark at the AP-2 site in vivo not fully established (DNMT2 implicated later in a specific context)\",\n        \"Whether TFAP2C is the dominant transcription factor for GPX1 in non-tumor tissues unknown\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that mTOR inhibition increases GPX1 protein without changing mRNA identified an additional translational control layer, distinct from SECIS/homocysteine regulation.\",\n      \"evidence\": \"Rapamycin treatment of CML cells, western blot vs. mRNA quantification\",\n      \"pmids\": [\"24691473\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether mTOR regulates GPX1 translation via 4E-BP/eIF4E, S6K, or through SECIS-binding factors is unresolved\",\n        \"Generalizability beyond CML cell lines not tested\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of a CUEDC2–TRIM33 axis that ubiquitinates GPX1 for proteasomal degradation established a targeted proteolytic control mechanism with pathophysiological relevance in cardiac ischemia-reperfusion injury.\",\n      \"evidence\": \"Cuedc2 knockout mice, Co-IP of CUEDC2–TRIM33–GPX1 complex, ubiquitination assay, ischemia-reperfusion injury model\",\n      \"pmids\": [\"27286733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific ubiquitinated lysine(s) on GPX1 not mapped\",\n        \"Whether TRIM33 is the sole E3 ligase for GPX1 is unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that PER1 physically interacts with GPX1 and enhances its activity connected the circadian clock to mitochondrial redox oscillations.\",\n      \"evidence\": \"Reciprocal Co-IP of PER1–GPX1, Per1 knockout mice, GPX activity assay, mitochondrial oxygen consumption measurement\",\n      \"pmids\": [\"32896721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Structural basis of PER1–GPX1 interaction unknown\",\n        \"Whether the interaction is direct or mediated by a bridging partner not resolved\",\n        \"Circadian oscillation of GPX1 activity not measured with temporal resolution\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that NONO binds GPX1 pre-mRNA intron and promotes correct splicing (with PSPC1) added a splicing-level regulatory layer; NONO loss causes intron retention and functional GPX1 deficiency.\",\n      \"evidence\": \"RIP-PCR, RNA pulldown, RNA sequencing, NONO knockdown/overexpression, Seahorse assay in glioblastoma cells\",\n      \"pmids\": [\"35910786\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Sequence specificity of the NONO-binding motif in GPX1 intron not fully defined\",\n        \"Whether this splicing regulation operates in non-cancer cell types unknown\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing that HIF-1α directly binds the GPX1 promoter under hypoxia to induce expression revealed how GPX1 is upregulated in the hypoxic tumor microenvironment; exosomal GPX1 transfer to endothelial cells extended GPX1 function beyond cell-autonomous antioxidant defense.\",\n      \"evidence\": \"ChIP of HIF-1α at GPX1 promoter, GPX1 knockdown, H2O2 measurement, xenograft model, exosome characterization\",\n      \"pmids\": [\"37572455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Relative contribution of HIF-1α vs. TFAP2C to GPX1 transcription under normoxic vs. hypoxic conditions not compared\",\n        \"Mechanism of GPX1 sorting into exosomes not elucidated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of S-palmitoylation at C76 and C113 as a stabilizing modification, reversed by PPT1 depalmitoylase, established a lipid-modification axis controlling GPX1 turnover with functional impact on pathological angiogenesis.\",\n      \"evidence\": \"Site-directed mutagenesis of C76/C113, PPT1 knockout mice (OIR model), PPT1 inhibitor DC661, protein stability assay\",\n      \"pmids\": [\"39423458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which palmitoyl acyltransferase(s) modify GPX1 is unknown\",\n        \"How palmitoylation and O-GlcNAcylation are coordinated on the same protein not explored\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified structural and kinetic model integrating the multiple post-translational modifications (O-GlcNAcylation, S-palmitoylation, ubiquitination, Sec-to-DHA conversion) and their crosstalk on GPX1 activity and stability remains to be constructed.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of human GPX1 with mapped PTM sites exists\",\n        \"Quantitative hierarchy among transcriptional (TFAP2C, HIF-1α), translational (SECIS, mTOR), splicing (NONO), and post-translational controls not established\",\n        \"Cell-type-specific integration of these regulatory layers not systematically characterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [0, 1, 9, 10]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 15]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:8953897\", \"supporting_discovery_ids\": [1, 4, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 5]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 7]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CUEDC2\",\n      \"TRIM33\",\n      \"PER1\",\n      \"PPT1\",\n      \"ABL1\",\n      \"ARG\",\n      \"NONO\",\n      \"PSPC1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}