{"gene":"SELENOH","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":2007,"finding":"SELENOH (SelH) is a nucleolar thioredoxin-like oxidoreductase. Sequence/structure analysis identified a thioredoxin fold with a conserved CXXU motif. Recombinant SelH showed glutathione peroxidase activity in vitro. GFP-fusion experiments localized full-length SelH to nucleoli in transfected mammalian cells; mutations in the N-terminal RKRK motif redirected the protein to the cytosol. SelH knockdown in LCC1 cells increased sensitivity to hydrogen peroxide, establishing a functional role in oxidative stress defense.","method":"Sequence/structure analysis, in vitro GPx activity assay with recombinant protein, GFP-fusion localization in transfected cells, RKRK motif mutagenesis, shRNA knockdown + H2O2 sensitivity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted enzymatic activity, mutagenesis of functional motif, live-cell localization with functional consequence, replicated across multiple orthogonal methods in single rigorous study","pmids":["17337453"],"is_preprint":false},{"year":2007,"finding":"SelH belongs to the Rdx (thioredoxin-like) protein family, which also includes SelW, SelV, SelT, and Rdx12. The family is proposed to possess a thioredoxin-like fold with a conserved CxxC/CxxU redox motif. GFP-fusion experiments showed distinct subcellular localization patterns for each family member in transfected cells. Affinity column experiments using mutant Rdx12 identified glutathione peroxidase 1 as an interacting target of Rdx12; 14-3-3 protein was identified as a target of SelW.","method":"Sequence similarity searches, GFP-fusion subcellular localization, affinity column pulldown with mutant protein versions","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — localization by GFP fusion confirmed for SelH; substrate identification for other family members by affinity column; single lab, multiple methods","pmids":["17503775"],"is_preprint":false},{"year":2014,"finding":"SelH suppresses cellular senescence in human fibroblasts (MRC-5) through a genome maintenance pathway. SelH shRNA knockdown under ambient O2 induced senescence markers (β-galactosidase, autofluorescence, growth inhibition) and activated the ATM/p53 pathway (phospho-ATM Ser-1981, γH2AX). Senescence phenotypes were rescued by ATM kinase inhibitors, p53 shRNA, or 3% O2. SelH shRNA HeLa cells were hypersensitive to paraquat and H2O2 (but not to hydroxyurea, neocarzinostatin, or camptothecin), indicating specificity for oxidative DNA damage. Glutathione levels were lower in SelH knockdown cells; H2O2-induced death was rescued by N-acetylcysteine.","method":"shRNA knockdown, β-galactosidase/autofluorescence senescence assays, immunoblotting for phospho-ATM and γH2AX, clonogenic survival assays, ATM inhibitor and p53 shRNA epistasis, glutathione measurement, NAC rescue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (shRNA, inhibitor epistasis, biochemical rescue), defined pathway placement (ATM-p53), specific phenotypic readout","pmids":["25336634"],"is_preprint":false},{"year":2010,"finding":"Overexpression of human SELENOH in murine hippocampal HT22 neuronal cells promotes mitochondrial biogenesis by increasing levels of NRF-1, PGC-1α, and Tfam. Mitochondrial cytochrome c content, mass, and respiration were elevated. SelH overexpression ameliorated UVB-induced suppression of mitochondrial biogenesis markers and prevented mitochondrial membrane depolarization.","method":"Stable transfection/overexpression in HT22 cells, immunoblotting for NRF-1/PGC-1α/Tfam/cytochrome c, mitochondrial mass and respiration assays, flow cytometry for membrane potential","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain-of-function overexpression with multiple mitochondrial readouts, single lab","pmids":["20656065"],"is_preprint":false},{"year":2009,"finding":"Overexpression of SELENOH in HT22 neuronal cells protected against UVB-induced death by blocking the mitochondrial apoptotic pathway: it prevented mitochondrial membrane depolarization, suppressed p53 induction, and reduced caspase-3 and -9 activation. SelH overexpression also increased NRF-1 and HSP40 levels.","method":"Transfection/overexpression, cell viability assays, immunoblotting for caspases/AIF/p53/NRF-1/HSP40, flow cytometry for mitochondrial membrane potential","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain-of-function with defined pathway readouts, single lab, multiple protein markers","pmids":["19766117"],"is_preprint":false},{"year":2018,"finding":"SELENOH knockdown in human colorectal cancer cells decreased cellular differentiation, increased proliferation and migration, enhanced clonogenic and xenograft tumor-forming ability, and accelerated G1/S cell cycle transition, establishing SELENOH as a regulator of cell cycle progression and an inhibitor of uncontrolled proliferation.","method":"shRNA knockdown, cell proliferation/migration assays, colony formation, xenograft tumor models, cell cycle analysis (FACS)","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with multiple orthogonal cellular phenotype readouts including in vivo xenograft, defined cell cycle phase effect","pmids":["29330096"],"is_preprint":false},{"year":2017,"finding":"Overexpression of SELENOH in HT22 cells protected against glutamate-induced cytotoxicity by preserving mitochondrial dynamics (preventing excessive fission) and suppressing autophagy. Glutamate-induced increases in ROS production and mitochondrial dynamic imbalance were reversed by SelH overexpression.","method":"Transfection/overexpression in HT22 cells, ROS measurement, mitochondrial morphology imaging, autophagy markers","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain-of-function with defined mitochondrial and autophagic phenotype readouts, single lab","pmids":["29535592"],"is_preprint":false},{"year":2022,"finding":"Isovalerylspiramycin I (ISP I) targets SELENOH (identified by DARTS and mass spectrometry). ISP I treatment accelerates SelH degradation, causing ROS accumulation in the nucleolus, triggering nucleolar stress, blocking ribosomal RNA transcription via the JNK2/TIF-IA/RNA Polymerase I pathway, and causing R-loop formation, DNA damage, cell cycle arrest, and apoptosis specifically in cancer cells.","method":"DARTS (drug affinity responsive target stability) + mass spectrometry for target ID, ROS assays, R-loop detection, rRNA transcription assays, JNK2/TIF-IA/POLI pathway analysis, cancer cell and tumor models","journal":"Journal of experimental & clinical cancer research : CR","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical target identification by DARTS+MS, multiple mechanistic pathway readouts, in vivo tumor models, multiple orthogonal methods","pmids":["35387667"],"is_preprint":false},{"year":2018,"finding":"Computational modeling (homology modeling, MD simulation, and docking) of SELENOH showed that the selenocysteine residue in the CXXU motif dynamically stabilizes protein structure via intramolecular hydrogen bonding and residue contacts. The N-terminal PRGRKRK motif (positions 3–9) was predicted to interact with HSE and STRE DNA elements (consistent with prior experimental localization data), and functions as both an AT-hook motif and a nuclear localization signal. Mutation of Sec-44 to Cys destabilized the structure.","method":"Homology modeling, molecular dynamics simulation, molecular docking with DNA elements, mutant analysis (Sec→Cys substitution)","journal":"Amino acids","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational only; no in vitro or in vivo biochemical validation of binding or activity reported in this paper","pmids":["29480333"],"is_preprint":false},{"year":2012,"finding":"Delta-lactoferrin (ΔLf), a transcription factor, activates transcription from the SelH promoter via a ΔLf response element. ΔLf was shown experimentally to interact in vivo with the SelH promoter, establishing SelH as a direct transcriptional target of ΔLf.","method":"Transcriptional reporter assays, chromatin immunoprecipitation/in vivo promoter interaction","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — in vivo promoter interaction reported experimentally; single lab, limited methodological detail in abstract","pmids":["22320386"],"is_preprint":false},{"year":2014,"finding":"In the Wilson's disease mouse model (Atp7b−/−), the nucleus-localized glutathione reductase/oxidoreductase SelH is upregulated in hepatic nuclei, likely to maintain redox balance in response to elevated copper accumulation, as demonstrated by quantitative nuclear proteomics.","method":"Quantitative MuDPIT nuclear proteomics (mass spectrometry-based), ionomics","journal":"Journal of molecular biology / Metallomics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — quantitative proteomics in disease model, single lab, no direct functional manipulation of SelH","pmids":["21146535","22565294"],"is_preprint":false},{"year":2021,"finding":"SELENOH overexpression in 293T cells identified two protein isoforms (long and short) by anti-FLAG immunoblotting and LC-MS/MS. Co-immunoprecipitation of FLAG-SELENOH co-identified three 60S ribosomal proteins and 9 other proteins as interactors. Overexpression of FLAG-SELENOH reduced glutathione peroxidase 1 and thioredoxin reductase 1 protein (but not mRNA) levels in selenium insufficiency, suggesting competition for selenoprotein biosynthesis machinery.","method":"FLAG-tag immunoprecipitation, LC-MS/MS, immunoblotting, qRT-PCR, transient transfection","journal":"The Journal of nutrition","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP + MS for interactor identification, protein vs. mRNA level dissection, single lab","pmids":["34510207"],"is_preprint":false},{"year":2025,"finding":"SELENOH targets mitochondrial carrier homolog 2 (MTCH2), identified by co-immunoprecipitation combined with mass spectrometry. SelH knockout in mice caused oxidative stress, impaired mitochondrial biogenesis, disrupted mitochondrial dynamics, enhanced mitophagy, and promoted apoptosis in kidneys. In HEK293t cells, SelH overexpression regulated MFN2 (mitofusin 2) via MTCH2 to promote mitochondrial fusion and maintain mitochondrial quality control homeostasis.","method":"Co-IP + mass spectrometry for MTCH2 identification, SelH knockout mice (cisplatin AKI model), laser confocal microscopy, molecular docking, MTCH2 knockdown/overexpression in HEK293t cells, oxidative stress/mitophagy/apoptosis assays","journal":"Journal of advanced research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP+MS for binding partner identification, in vivo KO model, orthogonal in vitro validation with defined pathway (MTCH2/MFN2 axis)","pmids":["41314281"],"is_preprint":false},{"year":2024,"finding":"Selenoh gene knockout (HKO) in mice caused significant cognitive decline associated with reduced myelin basic protein expression in hippocampal oligodendrocytes, decreased glycolipid levels, and increased phospholipid and sphingolipid levels in the hippocampus. RNA-seq of HKO hippocampus showed downregulation of myelination pathways, confirmed by reduced myelin-related protein expression. HKO increased expression of hippocampal fatty acid transporter (FATP) 4.","method":"Selenoh knockout mouse model, behavioral cognition tests, RNA-seq, immunoblotting for myelin proteins, lipidomics","journal":"Food & function","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined cellular (oligodendrocyte myelination) and biochemical (lipid metabolism) phenotypic readouts, multiple orthogonal methods","pmids":["39072440"],"is_preprint":false},{"year":2026,"finding":"SELENOH functions as a transcriptional coactivator (scaffolding, non-redox role) for the nuclear receptor PPARα to regulate hepatic fatty acid oxidation (FAO). SELENOH binds ligand-activated PPARα and orchestrates assembly and chromatin recruitment of the PPARα-P300 transactivation complex, driving FAO gene expression. This function is disrupted in metabolic dysfunction-associated steatohepatitis (MASH) due to SELENOH deficiency but reconstituted by selenium supplementation.","method":"Targeted screen, Co-IP/binding assays, chromatin recruitment assays, SELENOH KO mouse model, dietary selenium supplementation, FAO gene expression analysis","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — binding partner/complex identification, chromatin recruitment, genetic KO with defined metabolic phenotype, dietary intervention rescue, multiple orthogonal methods","pmids":["41655241"],"is_preprint":false}],"current_model":"SELENOH is a nuclear/nucleolar thioredoxin-like selenoprotein with a CXXU redox motif and an N-terminal RKRK nuclear localization signal; it exhibits glutathione peroxidase activity and functions as an oxidoreductase that scavenges ROS in the nucleolus to maintain genome stability, suppresses cellular senescence via the ATM-p53 pathway, regulates cell cycle G1/S progression, promotes mitochondrial biogenesis and quality control (via a MTCH2-MFN2 axis), and—diverging from its canonical redox role—acts as a scaffolding coactivator for PPARα to drive hepatic fatty acid oxidation gene expression; its degradation by the macrolide ISP I triggers nucleolar oxidative stress, blocks RNA Polymerase I-mediated rRNA transcription through JNK2/TIF-IA/POLI signaling, and induces cancer cell apoptosis."},"narrative":{"mechanistic_narrative":"SELENOH is a nucleolar thioredoxin-like selenoprotein that defends the genome against oxidative damage and serves as a hub linking redox homeostasis to cell-cycle control, mitochondrial quality, and metabolic gene expression [PMID:17337453, PMID:25336634]. It adopts a thioredoxin fold with a redox-active CXXU (selenocysteine) motif, displays glutathione peroxidase activity in vitro, and is targeted to nucleoli by an N-terminal RKRK signal whose mutation redirects the protein to the cytosol [PMID:17337453]. Through this antioxidant function SELENOH suppresses cellular senescence: its loss elevates oxidative DNA damage and activates the ATM/p53 pathway (phospho-ATM, γH2AX), with senescence reversed by ATM inhibition, p53 depletion, low oxygen, or N-acetylcysteine, indicating specificity for oxidative rather than general DNA damage [PMID:25336634]. Consistent with a genome-protective role, SELENOH restrains proliferation and migration and slows the G1/S transition in colorectal cancer cells, and its knockdown enhances tumor formation [PMID:29330096]. SELENOH also governs mitochondrial homeostasis, binding mitochondrial carrier homolog 2 (MTCH2) to regulate mitofusin 2 (MFN2)-dependent fusion and quality control; its genetic loss in mice causes oxidative stress, impaired mitochondrial biogenesis, and enhanced mitophagy [PMID:41314281]. Diverging from its redox role, SELENOH acts as a non-enzymatic scaffolding coactivator for ligand-activated PPARα, assembling and recruiting the PPARα–P300 complex to chromatin to drive hepatic fatty acid oxidation genes, a function disrupted in steatohepatitis and restored by selenium [PMID:41655241]. SELENOH is the molecular target of the macrolide isovalerylspiramycin I (ISP I), which accelerates its degradation to provoke nucleolar oxidative stress and block RNA Polymerase I rRNA transcription via JNK2/TIF-IA signaling, triggering cancer cell apoptosis [PMID:35387667].","teleology":[{"year":2007,"claim":"Established the core molecular identity of SELENOH: where it acts, what fold it has, and what enzymatic activity it carries, defining it as a nucleolar redox enzyme.","evidence":"Sequence/structure analysis, in vitro GPx assay with recombinant protein, GFP-fusion localization with RKRK mutagenesis, and shRNA knockdown + H2O2 sensitivity","pmids":["17337453","17503775"],"confidence":"High","gaps":["Endogenous physiological substrate of the GPx activity not defined","Nucleolar targets of the oxidoreductase activity unidentified"]},{"year":2009,"claim":"Linked SELENOH abundance to mitochondrial protection, showing gain-of-function blocks the mitochondrial apoptotic pathway and supports biogenesis markers.","evidence":"Overexpression in HT22 neuronal cells with caspase/p53/NRF-1/PGC-1α/Tfam readouts and membrane-potential flow cytometry","pmids":["19766117","20656065"],"confidence":"Medium","gaps":["Overexpression-only; physiological loss-of-function not tested here","Direct molecular link between SELENOH and biogenesis factors not established"]},{"year":2014,"claim":"Placed SELENOH in a defined genome-maintenance pathway, showing its loss drives oxidative DNA damage and ATM/p53-dependent senescence.","evidence":"shRNA knockdown in MRC-5/HeLa with senescence assays, phospho-ATM/γH2AX immunoblotting, ATM-inhibitor and p53-shRNA epistasis, oxygen tension and NAC rescue","pmids":["25336634"],"confidence":"High","gaps":["How SELENOH connects nucleolar redox state to chromatin DNA damage not resolved","Whether the effect requires GPx catalytic activity untested"]},{"year":2018,"claim":"Demonstrated SELENOH is a cell-cycle and tumor suppressor, restraining G1/S progression and proliferation in vivo.","evidence":"shRNA knockdown in colorectal cancer cells with proliferation/migration/clonogenic assays, FACS cell-cycle analysis, and xenograft tumor models","pmids":["29330096"],"confidence":"High","gaps":["Molecular effectors coupling SELENOH to G1/S machinery not identified","Relationship to the ATM/p53 senescence axis not directly tested"]},{"year":2022,"claim":"Identified SELENOH as the direct drug target of ISP I and showed its degradation triggers nucleolar stress and shutdown of rRNA transcription in cancer cells.","evidence":"DARTS + mass spectrometry target identification, ROS/R-loop/rRNA assays, JNK2/TIF-IA/POL I pathway analysis, and tumor models","pmids":["35387667"],"confidence":"High","gaps":["Mechanism of ISP I-induced SELENOH degradation (protease/pathway) not defined","Why cancer cells are selectively sensitive not fully explained"]},{"year":2025,"claim":"Defined a physical and functional mitochondrial axis, showing SELENOH binds MTCH2 to regulate MFN2-dependent fusion and quality control.","evidence":"Co-IP + mass spectrometry, SELENOH knockout mice (cisplatin AKI), confocal imaging, molecular docking, and MTCH2 manipulation in HEK293t cells","pmids":["41314281"],"confidence":"High","gaps":["Whether SELENOH redox activity is required for MTCH2 regulation unclear","Direct interaction interface not structurally validated"]},{"year":2026,"claim":"Revealed a non-redox scaffolding function, establishing SELENOH as a PPARα coactivator that assembles the PPARα-P300 complex on chromatin to drive hepatic fatty acid oxidation.","evidence":"Targeted screen, Co-IP/binding and chromatin recruitment assays, SELENOH KO mice, and dietary selenium rescue in a MASH model","pmids":["41655241"],"confidence":"High","gaps":["How a redox-motif protein switches to a structural coactivator role mechanistically unresolved","Whether nucleolar localization is compatible with chromatin/PPARα recruitment not reconciled"]},{"year":null,"claim":"It remains unknown how SELENOH's distinct activities—nucleolar redox scavenging, mitochondrial MTCH2 binding, and PPARα transcriptional coactivation—are integrated, and whether they share a common catalytic or structural requirement.","evidence":"No single study reconciles the enzymatic and scaffolding functions","pmids":[],"confidence":"Low","gaps":["No structure of full-length SELENOH bound to a partner","Endogenous redox substrate still unidentified","Tissue-specific determinants of which function dominates unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[14]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,10]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[14]}],"complexes":[],"partners":["MTCH2","MFN2","PPARA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IZQ5","full_name":"Selenoprotein H","aliases":[],"length_aa":122,"mass_kda":13.5,"function":"May be involved in a redox-related process","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q8IZQ5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SELENOH","classification":"Not Classified","n_dependent_lines":29,"n_total_lines":1208,"dependency_fraction":0.024006622516556293},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SELENOH","total_profiled":1310},"omim":[{"mim_id":"607914","title":"SELENOPROTEIN H; SELENOH","url":"https://www.omim.org/entry/607914"},{"mim_id":"607651","title":"PLECKSTRIN HOMOLOGY DOMAIN-CONTAINING PROTEIN, FAMILY B, MEMBER 1; PLEKHB1","url":"https://www.omim.org/entry/607651"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SELENOH"},"hgnc":{"alias_symbol":["SELH"],"prev_symbol":["C11orf31"]},"alphafold":{"accession":"Q8IZQ5","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IZQ5","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SELENOH","jax_strain_url":"https://www.jax.org/strain/search?query=SELENOH"},"sequence":{"accession":"Q8IZQ5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IZQ5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IZQ5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IZQ5"}},"corpus_meta":[{"pmid":"17177317","id":"PMC_17177317","title":"Mouse mutants with neural tube closure defects and their role in understanding human neural tube defects.","date":"2007","source":"Birth defects research. 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standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"SELENOH (SelH) is a nucleolar thioredoxin-like oxidoreductase. Sequence/structure analysis identified a thioredoxin fold with a conserved CXXU motif. Recombinant SelH showed glutathione peroxidase activity in vitro. GFP-fusion experiments localized full-length SelH to nucleoli in transfected mammalian cells; mutations in the N-terminal RKRK motif redirected the protein to the cytosol. SelH knockdown in LCC1 cells increased sensitivity to hydrogen peroxide, establishing a functional role in oxidative stress defense.\",\n      \"method\": \"Sequence/structure analysis, in vitro GPx activity assay with recombinant protein, GFP-fusion localization in transfected cells, RKRK motif mutagenesis, shRNA knockdown + H2O2 sensitivity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted enzymatic activity, mutagenesis of functional motif, live-cell localization with functional consequence, replicated across multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"17337453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SelH belongs to the Rdx (thioredoxin-like) protein family, which also includes SelW, SelV, SelT, and Rdx12. The family is proposed to possess a thioredoxin-like fold with a conserved CxxC/CxxU redox motif. GFP-fusion experiments showed distinct subcellular localization patterns for each family member in transfected cells. Affinity column experiments using mutant Rdx12 identified glutathione peroxidase 1 as an interacting target of Rdx12; 14-3-3 protein was identified as a target of SelW.\",\n      \"method\": \"Sequence similarity searches, GFP-fusion subcellular localization, affinity column pulldown with mutant protein versions\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — localization by GFP fusion confirmed for SelH; substrate identification for other family members by affinity column; single lab, multiple methods\",\n      \"pmids\": [\"17503775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SelH suppresses cellular senescence in human fibroblasts (MRC-5) through a genome maintenance pathway. SelH shRNA knockdown under ambient O2 induced senescence markers (β-galactosidase, autofluorescence, growth inhibition) and activated the ATM/p53 pathway (phospho-ATM Ser-1981, γH2AX). Senescence phenotypes were rescued by ATM kinase inhibitors, p53 shRNA, or 3% O2. SelH shRNA HeLa cells were hypersensitive to paraquat and H2O2 (but not to hydroxyurea, neocarzinostatin, or camptothecin), indicating specificity for oxidative DNA damage. Glutathione levels were lower in SelH knockdown cells; H2O2-induced death was rescued by N-acetylcysteine.\",\n      \"method\": \"shRNA knockdown, β-galactosidase/autofluorescence senescence assays, immunoblotting for phospho-ATM and γH2AX, clonogenic survival assays, ATM inhibitor and p53 shRNA epistasis, glutathione measurement, NAC rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (shRNA, inhibitor epistasis, biochemical rescue), defined pathway placement (ATM-p53), specific phenotypic readout\",\n      \"pmids\": [\"25336634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Overexpression of human SELENOH in murine hippocampal HT22 neuronal cells promotes mitochondrial biogenesis by increasing levels of NRF-1, PGC-1α, and Tfam. Mitochondrial cytochrome c content, mass, and respiration were elevated. SelH overexpression ameliorated UVB-induced suppression of mitochondrial biogenesis markers and prevented mitochondrial membrane depolarization.\",\n      \"method\": \"Stable transfection/overexpression in HT22 cells, immunoblotting for NRF-1/PGC-1α/Tfam/cytochrome c, mitochondrial mass and respiration assays, flow cytometry for membrane potential\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain-of-function overexpression with multiple mitochondrial readouts, single lab\",\n      \"pmids\": [\"20656065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Overexpression of SELENOH in HT22 neuronal cells protected against UVB-induced death by blocking the mitochondrial apoptotic pathway: it prevented mitochondrial membrane depolarization, suppressed p53 induction, and reduced caspase-3 and -9 activation. SelH overexpression also increased NRF-1 and HSP40 levels.\",\n      \"method\": \"Transfection/overexpression, cell viability assays, immunoblotting for caspases/AIF/p53/NRF-1/HSP40, flow cytometry for mitochondrial membrane potential\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain-of-function with defined pathway readouts, single lab, multiple protein markers\",\n      \"pmids\": [\"19766117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SELENOH knockdown in human colorectal cancer cells decreased cellular differentiation, increased proliferation and migration, enhanced clonogenic and xenograft tumor-forming ability, and accelerated G1/S cell cycle transition, establishing SELENOH as a regulator of cell cycle progression and an inhibitor of uncontrolled proliferation.\",\n      \"method\": \"shRNA knockdown, cell proliferation/migration assays, colony formation, xenograft tumor models, cell cycle analysis (FACS)\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with multiple orthogonal cellular phenotype readouts including in vivo xenograft, defined cell cycle phase effect\",\n      \"pmids\": [\"29330096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of SELENOH in HT22 cells protected against glutamate-induced cytotoxicity by preserving mitochondrial dynamics (preventing excessive fission) and suppressing autophagy. Glutamate-induced increases in ROS production and mitochondrial dynamic imbalance were reversed by SelH overexpression.\",\n      \"method\": \"Transfection/overexpression in HT22 cells, ROS measurement, mitochondrial morphology imaging, autophagy markers\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain-of-function with defined mitochondrial and autophagic phenotype readouts, single lab\",\n      \"pmids\": [\"29535592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Isovalerylspiramycin I (ISP I) targets SELENOH (identified by DARTS and mass spectrometry). ISP I treatment accelerates SelH degradation, causing ROS accumulation in the nucleolus, triggering nucleolar stress, blocking ribosomal RNA transcription via the JNK2/TIF-IA/RNA Polymerase I pathway, and causing R-loop formation, DNA damage, cell cycle arrest, and apoptosis specifically in cancer cells.\",\n      \"method\": \"DARTS (drug affinity responsive target stability) + mass spectrometry for target ID, ROS assays, R-loop detection, rRNA transcription assays, JNK2/TIF-IA/POLI pathway analysis, cancer cell and tumor models\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical target identification by DARTS+MS, multiple mechanistic pathway readouts, in vivo tumor models, multiple orthogonal methods\",\n      \"pmids\": [\"35387667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Computational modeling (homology modeling, MD simulation, and docking) of SELENOH showed that the selenocysteine residue in the CXXU motif dynamically stabilizes protein structure via intramolecular hydrogen bonding and residue contacts. The N-terminal PRGRKRK motif (positions 3–9) was predicted to interact with HSE and STRE DNA elements (consistent with prior experimental localization data), and functions as both an AT-hook motif and a nuclear localization signal. Mutation of Sec-44 to Cys destabilized the structure.\",\n      \"method\": \"Homology modeling, molecular dynamics simulation, molecular docking with DNA elements, mutant analysis (Sec→Cys substitution)\",\n      \"journal\": \"Amino acids\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational only; no in vitro or in vivo biochemical validation of binding or activity reported in this paper\",\n      \"pmids\": [\"29480333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Delta-lactoferrin (ΔLf), a transcription factor, activates transcription from the SelH promoter via a ΔLf response element. ΔLf was shown experimentally to interact in vivo with the SelH promoter, establishing SelH as a direct transcriptional target of ΔLf.\",\n      \"method\": \"Transcriptional reporter assays, chromatin immunoprecipitation/in vivo promoter interaction\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — in vivo promoter interaction reported experimentally; single lab, limited methodological detail in abstract\",\n      \"pmids\": [\"22320386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In the Wilson's disease mouse model (Atp7b−/−), the nucleus-localized glutathione reductase/oxidoreductase SelH is upregulated in hepatic nuclei, likely to maintain redox balance in response to elevated copper accumulation, as demonstrated by quantitative nuclear proteomics.\",\n      \"method\": \"Quantitative MuDPIT nuclear proteomics (mass spectrometry-based), ionomics\",\n      \"journal\": \"Journal of molecular biology / Metallomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — quantitative proteomics in disease model, single lab, no direct functional manipulation of SelH\",\n      \"pmids\": [\"21146535\", \"22565294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SELENOH overexpression in 293T cells identified two protein isoforms (long and short) by anti-FLAG immunoblotting and LC-MS/MS. Co-immunoprecipitation of FLAG-SELENOH co-identified three 60S ribosomal proteins and 9 other proteins as interactors. Overexpression of FLAG-SELENOH reduced glutathione peroxidase 1 and thioredoxin reductase 1 protein (but not mRNA) levels in selenium insufficiency, suggesting competition for selenoprotein biosynthesis machinery.\",\n      \"method\": \"FLAG-tag immunoprecipitation, LC-MS/MS, immunoblotting, qRT-PCR, transient transfection\",\n      \"journal\": \"The Journal of nutrition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP + MS for interactor identification, protein vs. mRNA level dissection, single lab\",\n      \"pmids\": [\"34510207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SELENOH targets mitochondrial carrier homolog 2 (MTCH2), identified by co-immunoprecipitation combined with mass spectrometry. SelH knockout in mice caused oxidative stress, impaired mitochondrial biogenesis, disrupted mitochondrial dynamics, enhanced mitophagy, and promoted apoptosis in kidneys. In HEK293t cells, SelH overexpression regulated MFN2 (mitofusin 2) via MTCH2 to promote mitochondrial fusion and maintain mitochondrial quality control homeostasis.\",\n      \"method\": \"Co-IP + mass spectrometry for MTCH2 identification, SelH knockout mice (cisplatin AKI model), laser confocal microscopy, molecular docking, MTCH2 knockdown/overexpression in HEK293t cells, oxidative stress/mitophagy/apoptosis assays\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP+MS for binding partner identification, in vivo KO model, orthogonal in vitro validation with defined pathway (MTCH2/MFN2 axis)\",\n      \"pmids\": [\"41314281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Selenoh gene knockout (HKO) in mice caused significant cognitive decline associated with reduced myelin basic protein expression in hippocampal oligodendrocytes, decreased glycolipid levels, and increased phospholipid and sphingolipid levels in the hippocampus. RNA-seq of HKO hippocampus showed downregulation of myelination pathways, confirmed by reduced myelin-related protein expression. HKO increased expression of hippocampal fatty acid transporter (FATP) 4.\",\n      \"method\": \"Selenoh knockout mouse model, behavioral cognition tests, RNA-seq, immunoblotting for myelin proteins, lipidomics\",\n      \"journal\": \"Food & function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined cellular (oligodendrocyte myelination) and biochemical (lipid metabolism) phenotypic readouts, multiple orthogonal methods\",\n      \"pmids\": [\"39072440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SELENOH functions as a transcriptional coactivator (scaffolding, non-redox role) for the nuclear receptor PPARα to regulate hepatic fatty acid oxidation (FAO). SELENOH binds ligand-activated PPARα and orchestrates assembly and chromatin recruitment of the PPARα-P300 transactivation complex, driving FAO gene expression. This function is disrupted in metabolic dysfunction-associated steatohepatitis (MASH) due to SELENOH deficiency but reconstituted by selenium supplementation.\",\n      \"method\": \"Targeted screen, Co-IP/binding assays, chromatin recruitment assays, SELENOH KO mouse model, dietary selenium supplementation, FAO gene expression analysis\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — binding partner/complex identification, chromatin recruitment, genetic KO with defined metabolic phenotype, dietary intervention rescue, multiple orthogonal methods\",\n      \"pmids\": [\"41655241\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SELENOH is a nuclear/nucleolar thioredoxin-like selenoprotein with a CXXU redox motif and an N-terminal RKRK nuclear localization signal; it exhibits glutathione peroxidase activity and functions as an oxidoreductase that scavenges ROS in the nucleolus to maintain genome stability, suppresses cellular senescence via the ATM-p53 pathway, regulates cell cycle G1/S progression, promotes mitochondrial biogenesis and quality control (via a MTCH2-MFN2 axis), and—diverging from its canonical redox role—acts as a scaffolding coactivator for PPARα to drive hepatic fatty acid oxidation gene expression; its degradation by the macrolide ISP I triggers nucleolar oxidative stress, blocks RNA Polymerase I-mediated rRNA transcription through JNK2/TIF-IA/POLI signaling, and induces cancer cell apoptosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SELENOH is a nucleolar thioredoxin-like selenoprotein that defends the genome against oxidative damage and serves as a hub linking redox homeostasis to cell-cycle control, mitochondrial quality, and metabolic gene expression [#0, #2]. It adopts a thioredoxin fold with a redox-active CXXU (selenocysteine) motif, displays glutathione peroxidase activity in vitro, and is targeted to nucleoli by an N-terminal RKRK signal whose mutation redirects the protein to the cytosol [#0]. Through this antioxidant function SELENOH suppresses cellular senescence: its loss elevates oxidative DNA damage and activates the ATM/p53 pathway (phospho-ATM, \\u03b3H2AX), with senescence reversed by ATM inhibition, p53 depletion, low oxygen, or N-acetylcysteine, indicating specificity for oxidative rather than general DNA damage [#2]. Consistent with a genome-protective role, SELENOH restrains proliferation and migration and slows the G1/S transition in colorectal cancer cells, and its knockdown enhances tumor formation [#5]. SELENOH also governs mitochondrial homeostasis, binding mitochondrial carrier homolog 2 (MTCH2) to regulate mitofusin 2 (MFN2)-dependent fusion and quality control; its genetic loss in mice causes oxidative stress, impaired mitochondrial biogenesis, and enhanced mitophagy [#12]. Diverging from its redox role, SELENOH acts as a non-enzymatic scaffolding coactivator for ligand-activated PPAR\\u03b1, assembling and recruiting the PPAR\\u03b1\\u2013P300 complex to chromatin to drive hepatic fatty acid oxidation genes, a function disrupted in steatohepatitis and restored by selenium [#14]. SELENOH is the molecular target of the macrolide isovalerylspiramycin I (ISP I), which accelerates its degradation to provoke nucleolar oxidative stress and block RNA Polymerase I rRNA transcription via JNK2/TIF-IA signaling, triggering cancer cell apoptosis [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established the core molecular identity of SELENOH: where it acts, what fold it has, and what enzymatic activity it carries, defining it as a nucleolar redox enzyme.\",\n      \"evidence\": \"Sequence/structure analysis, in vitro GPx assay with recombinant protein, GFP-fusion localization with RKRK mutagenesis, and shRNA knockdown + H2O2 sensitivity\",\n      \"pmids\": [\"17337453\", \"17503775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous physiological substrate of the GPx activity not defined\", \"Nucleolar targets of the oxidoreductase activity unidentified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linked SELENOH abundance to mitochondrial protection, showing gain-of-function blocks the mitochondrial apoptotic pathway and supports biogenesis markers.\",\n      \"evidence\": \"Overexpression in HT22 neuronal cells with caspase/p53/NRF-1/PGC-1\\u03b1/Tfam readouts and membrane-potential flow cytometry\",\n      \"pmids\": [\"19766117\", \"20656065\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-only; physiological loss-of-function not tested here\", \"Direct molecular link between SELENOH and biogenesis factors not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed SELENOH in a defined genome-maintenance pathway, showing its loss drives oxidative DNA damage and ATM/p53-dependent senescence.\",\n      \"evidence\": \"shRNA knockdown in MRC-5/HeLa with senescence assays, phospho-ATM/\\u03b3H2AX immunoblotting, ATM-inhibitor and p53-shRNA epistasis, oxygen tension and NAC rescue\",\n      \"pmids\": [\"25336634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SELENOH connects nucleolar redox state to chromatin DNA damage not resolved\", \"Whether the effect requires GPx catalytic activity untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated SELENOH is a cell-cycle and tumor suppressor, restraining G1/S progression and proliferation in vivo.\",\n      \"evidence\": \"shRNA knockdown in colorectal cancer cells with proliferation/migration/clonogenic assays, FACS cell-cycle analysis, and xenograft tumor models\",\n      \"pmids\": [\"29330096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular effectors coupling SELENOH to G1/S machinery not identified\", \"Relationship to the ATM/p53 senescence axis not directly tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified SELENOH as the direct drug target of ISP I and showed its degradation triggers nucleolar stress and shutdown of rRNA transcription in cancer cells.\",\n      \"evidence\": \"DARTS + mass spectrometry target identification, ROS/R-loop/rRNA assays, JNK2/TIF-IA/POL I pathway analysis, and tumor models\",\n      \"pmids\": [\"35387667\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of ISP I-induced SELENOH degradation (protease/pathway) not defined\", \"Why cancer cells are selectively sensitive not fully explained\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a physical and functional mitochondrial axis, showing SELENOH binds MTCH2 to regulate MFN2-dependent fusion and quality control.\",\n      \"evidence\": \"Co-IP + mass spectrometry, SELENOH knockout mice (cisplatin AKI), confocal imaging, molecular docking, and MTCH2 manipulation in HEK293t cells\",\n      \"pmids\": [\"41314281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SELENOH redox activity is required for MTCH2 regulation unclear\", \"Direct interaction interface not structurally validated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Revealed a non-redox scaffolding function, establishing SELENOH as a PPAR\\u03b1 coactivator that assembles the PPAR\\u03b1-P300 complex on chromatin to drive hepatic fatty acid oxidation.\",\n      \"evidence\": \"Targeted screen, Co-IP/binding and chromatin recruitment assays, SELENOH KO mice, and dietary selenium rescue in a MASH model\",\n      \"pmids\": [\"41655241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a redox-motif protein switches to a structural coactivator role mechanistically unresolved\", \"Whether nucleolar localization is compatible with chromatin/PPAR\\u03b1 recruitment not reconciled\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how SELENOH's distinct activities\\u2014nucleolar redox scavenging, mitochondrial MTCH2 binding, and PPAR\\u03b1 transcriptional coactivation\\u2014are integrated, and whether they share a common catalytic or structural requirement.\",\n      \"evidence\": \"No single study reconciles the enzymatic and scaffolding functions\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of full-length SELENOH bound to a partner\", \"Endogenous redox substrate still unidentified\", \"Tissue-specific determinants of which function dominates unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MTCH2\", \"MFN2\", \"PPARA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":7,"faith_total":7,"faith_pct":100.0}}