{"gene":"HMGN4","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2001,"finding":"HMGN4 (encoded by an intronless gene at chromosome 6p21.3) is a nuclear protein closely related to HMGN2 that localizes to the nucleus in HeLa cells and binds nucleosomes, expanding the HMGN protein family of nucleosome-binding proteins.","method":"Western blot with antibody against unique HMGN4 region, transfection of HeLa cells with HMGN4-GFP fusion for nuclear localization, Northern blot for tissue expression","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct localization by live fluorescence imaging of GFP fusion and Western blot detection; single lab with multiple methods but no functional mechanistic follow-up beyond localization","pmids":["11410162"],"is_preprint":false},{"year":2017,"finding":"Overexpression of HMGN4 in mouse and human cells alters the cellular transcription profile, downregulates tumor suppressors Atm, Atrx, and Brca2, elevates the DNA damage marker γH2AX, and increases tumorigenicity as measured by colony formation and tumor generation in nude mice; transgenic mice overexpressing HMGN4 in the thyroid develop preneoplastic lesions, establishing HMGN4 as an epigenetic factor that potentiates thyroid oncogenesis.","method":"Transgenic mouse overexpression, colony formation assays, nude mouse tumor xenograft, transcriptomic profiling, γH2AX immunostaining, gene expression analysis","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined cellular and in vivo phenotypes from loss/gain-of-function with pathway placement (epigenetic regulation of tumor suppressor expression), single lab with multiple orthogonal assays","pmids":["28186538"],"is_preprint":false}],"current_model":"HMGN4 is an intronless-gene-encoded nucleosome-binding protein that localizes to the nucleus, belongs to the HMGN family, modulates the cellular transcription profile by downregulating tumor suppressors (Atm, Atrx, Brca2), elevates DNA damage signaling (γH2AX), and potentiates thyroid tumorigenesis when overexpressed."},"narrative":{"mechanistic_narrative":"HMGN4 is a nuclear nucleosome-binding protein of the HMGN family that modulates chromatin and transcription, encoded by an intronless gene at chromosome 6p21.3 and closely related to HMGN2 [PMID:11410162]. It localizes to the nucleus and binds nucleosomes [PMID:11410162], and when overexpressed it reshapes the cellular transcription profile—downregulating the tumor suppressors Atm, Atrx, and Brca2, elevating the DNA damage marker γH2AX, and increasing tumorigenicity in colony-formation and xenograft assays; thyroid-targeted transgenic overexpression drives preneoplastic lesions, establishing HMGN4 as an epigenetic potentiator of thyroid oncogenesis [PMID:28186538]. Beyond these findings, the molecular details of how HMGN4 binding to nucleosomes effects transcriptional repression of specific tumor suppressors have not been characterized in the available corpus.","teleology":[{"year":2001,"claim":"Establishing whether HMGN4 is a bona fide member of the nucleosome-binding HMGN family answered where this protein acts and how it engages chromatin.","evidence":"Western blot with a region-specific antibody, HMGN4-GFP fusion live imaging in HeLa cells, and Northern blot tissue profiling","pmids":["11410162"],"confidence":"Medium","gaps":["No functional consequence of nucleosome binding tested","No mapping of genomic binding sites","Relationship to other HMGN paralogs at shared sites unresolved"]},{"year":2017,"claim":"Determining the cellular consequence of HMGN4 dosage showed it functions as an epigenetic factor that represses tumor suppressors and promotes tumorigenesis.","evidence":"Transgenic mouse thyroid overexpression, transcriptomic profiling, γH2AX immunostaining, colony-formation and nude-mouse xenograft assays","pmids":["28186538"],"confidence":"Medium","gaps":["Direct chromatin occupancy at Atm/Atrx/Brca2 loci not demonstrated","Mechanism linking nucleosome binding to gene repression unknown","Loss-of-function phenotype in normal physiology not defined"]},{"year":null,"claim":"How HMGN4 nucleosome binding is mechanistically coupled to transcriptional repression of specific tumor suppressors and to DNA damage signaling remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No genome-wide binding map","No structural basis for target selectivity","No identified protein partners or chromatin co-factors"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00479","full_name":"High mobility group nucleosome-binding domain-containing protein 4","aliases":["Non-histone chromosomal protein HMG-17-like 3","Non-histone chromosomal protein"],"length_aa":90,"mass_kda":9.5,"function":"","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O00479/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HMGN4","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HMGN4","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HMGN4"},"hgnc":{"alias_symbol":["NHC"],"prev_symbol":["HMG17L3"]},"alphafold":{"accession":"O00479","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00479","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00479-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00479-F1-predicted_aligned_error_v6.png","plddt_mean":65.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HMGN4","jax_strain_url":"https://www.jax.org/strain/search?query=HMGN4"},"sequence":{"accession":"O00479","fasta_url":"https://rest.uniprot.org/uniprotkb/O00479.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00479/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00479"}},"corpus_meta":[{"pmid":"30653296","id":"PMC_30653296","title":"NHC-Catalyzed Generation of α,β-Unsaturated Acylazoliums for the Enantioselective Synthesis of Heterocycles and 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2003)","url":"https://pubmed.ncbi.nlm.nih.gov/34989741","citation_count":18,"is_preprint":false},{"pmid":"26406613","id":"PMC_26406613","title":"Stereo- and Chemodivergent NHC-Promoted Functionalisation of Arylalkylketenes with Chloral.","date":"2015","source":"Chemistry (Weinheim an der Bergstrasse, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/26406613","citation_count":18,"is_preprint":false},{"pmid":"31429450","id":"PMC_31429450","title":"Expanding the biological utility of bis-NHC gold(i) complexes through post synthetic carbamate conjugation.","date":"2019","source":"Chemical communications (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/31429450","citation_count":18,"is_preprint":false},{"pmid":"38359780","id":"PMC_38359780","title":"Mechanism and Origin of Stereoselectivity for the NHC-Catalyzed Desymmetrization Reaction for the Synthesis of Axially Chiral Biaryl Aldehydes.","date":"2024","source":"The Journal of organic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38359780","citation_count":17,"is_preprint":false},{"pmid":"27115175","id":"PMC_27115175","title":"Linking of Antitumor trans NHC-Pt(II) Complexes to G-Quadruplex DNA Ligand for Telomeric Targeting.","date":"2016","source":"Bioconjugate chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27115175","citation_count":17,"is_preprint":false},{"pmid":"30110951","id":"PMC_30110951","title":"Synthesis and Cytotoxicity Studies of Novel NHC*-Gold(I) Complexes Derived from Lepidiline A.","date":"2018","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/30110951","citation_count":17,"is_preprint":false},{"pmid":"35262358","id":"PMC_35262358","title":"Access to Sulfoxides under NHC/Photocatalysis via a Radical Pathway.","date":"2022","source":"Organic letters","url":"https://pubmed.ncbi.nlm.nih.gov/35262358","citation_count":17,"is_preprint":false},{"pmid":"30562016","id":"PMC_30562016","title":"NHC-Catalyzed Dual Stetter Reaction: A Mild Cascade Annulation for the Syntheses of Naphthoquinones, Isoflavanones, and Sugar-Based Chiral Analogues.","date":"2018","source":"The Journal of organic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30562016","citation_count":17,"is_preprint":false},{"pmid":"27997743","id":"PMC_27997743","title":"Metal NHC Complexes with Naphthalimide Ligands as DNA-Interacting Antiproliferative Agents.","date":"2017","source":"ChemMedChem","url":"https://pubmed.ncbi.nlm.nih.gov/27997743","citation_count":16,"is_preprint":false},{"pmid":"33233711","id":"PMC_33233711","title":"On the Different Mode of Action of Au(I)/Ag(I)-NHC Bis-Anthracenyl Complexes Towards Selected Target Biomolecules.","date":"2020","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/33233711","citation_count":16,"is_preprint":false},{"pmid":"32592289","id":"PMC_32592289","title":"Antiproliferative Activity of Functionalized Histidine-derived Au(I) bis-NHC Complexes for Bioconjugation.","date":"2020","source":"Chemistry, an Asian journal","url":"https://pubmed.ncbi.nlm.nih.gov/32592289","citation_count":16,"is_preprint":false},{"pmid":"29192701","id":"PMC_29192701","title":"Aptamer-mediated selective delivery of a cytotoxic cationic NHC-Au(i) complex to cancer cells.","date":"2017","source":"Dalton transactions (Cambridge, England : 2003)","url":"https://pubmed.ncbi.nlm.nih.gov/29192701","citation_count":16,"is_preprint":false},{"pmid":"34647935","id":"PMC_34647935","title":"Synthesis, characterization, antimicrobial and antibiofilm activity, and molecular docking analysis of NHC precursors and their Ag-NHC complexes.","date":"2021","source":"Dalton transactions (Cambridge, England : 2003)","url":"https://pubmed.ncbi.nlm.nih.gov/34647935","citation_count":14,"is_preprint":false},{"pmid":"37030104","id":"PMC_37030104","title":"Design, synthesis, characterization, crystal structure, in silico studies, and inhibitory properties of the PEPPSI type Pd(II)NHC complexes bearing chloro/fluorobenzyl group.","date":"2023","source":"Bioorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/37030104","citation_count":14,"is_preprint":false},{"pmid":"357114","id":"PMC_357114","title":"Production and characterization of antisera against three individual NHC proteins; a case of a generally distributed NHC protein.","date":"1978","source":"Chromosoma","url":"https://pubmed.ncbi.nlm.nih.gov/357114","citation_count":14,"is_preprint":false},{"pmid":"31909202","id":"PMC_31909202","title":"NHC-gold compounds mediate immune suppression through induction of AHR-TGFβ1 signalling in vitro and in scurfy mice.","date":"2020","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/31909202","citation_count":14,"is_preprint":false},{"pmid":"33180473","id":"PMC_33180473","title":"A Combined Spectroscopic and Protein Crystallography Study Reveals Protein Interactions of RhI(NHC) Complexes at the Molecular Level.","date":"2020","source":"Inorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33180473","citation_count":13,"is_preprint":false},{"pmid":"35543764","id":"PMC_35543764","title":"The effects of two gold-N-heterocyclic carbene (NHC) complexes in ovarian cancer cells: a redox proteomic study.","date":"2022","source":"Cancer chemotherapy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35543764","citation_count":13,"is_preprint":false},{"pmid":"35866449","id":"PMC_35866449","title":"Facile Benzylic Alkylation of Arenes with Alcohols by Catalysis with Spirocyclic NHC IrIII Pincer Complex.","date":"2022","source":"Angewandte Chemie (International ed. in English)","url":"https://pubmed.ncbi.nlm.nih.gov/35866449","citation_count":13,"is_preprint":false},{"pmid":"37550857","id":"PMC_37550857","title":"NHC-Catalyzed Regioselective Intramolecular Radical Cyclization Reaction for the Synthesis of Benzazepine Derivatives.","date":"2023","source":"Organic letters","url":"https://pubmed.ncbi.nlm.nih.gov/37550857","citation_count":13,"is_preprint":false},{"pmid":"32609522","id":"PMC_32609522","title":"Enantioselective Synthesis of Tricyclic β-Lactones by NHC-Catalyzed Desymmetrization of Cyclic 1,3-Diketones.","date":"2020","source":"Organic letters","url":"https://pubmed.ncbi.nlm.nih.gov/32609522","citation_count":13,"is_preprint":false},{"pmid":"36006026","id":"PMC_36006026","title":"Ir and NHC Dual Chiral Synergetic Catalysis: Mechanism and Stereoselectivity in γ-Butyrolactone Formation.","date":"2022","source":"Journal of the American Chemical Society","url":"https://pubmed.ncbi.nlm.nih.gov/36006026","citation_count":12,"is_preprint":false},{"pmid":"39196554","id":"PMC_39196554","title":"A New Class of Gold(I) NHC Complexes with Proapoptotic and Resensitizing Properties towards Multidrug Resistant Leukemia Cells Overexpressing BCL-2.","date":"2024","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/39196554","citation_count":12,"is_preprint":false},{"pmid":"30566132","id":"PMC_30566132","title":"Fluorescent functionalised naphthalimides and their Au(i)-NHC complexes for potential use in cellular bioimaging.","date":"2018","source":"Dalton transactions (Cambridge, England : 2003)","url":"https://pubmed.ncbi.nlm.nih.gov/30566132","citation_count":12,"is_preprint":false},{"pmid":"32693297","id":"PMC_32693297","title":"Mechanisms underlying the cytotoxic activity of syn/anti-isomers of dinuclear Au(I) NHC complexes.","date":"2020","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32693297","citation_count":12,"is_preprint":false},{"pmid":"28686022","id":"PMC_28686022","title":"NHC-Cu(I)-Catalyzed Friedländer-Type Annulation of Fluorinated o-Aminophenones with Alkynes on Water: Competitive Base-Catalyzed Dibenzo[b,f][1,5]diazocine Formation.","date":"2017","source":"The Journal of organic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28686022","citation_count":11,"is_preprint":false},{"pmid":"27306484","id":"PMC_27306484","title":"A DFT study on NHC-catalyzed intramolecular aldehyde-ketone crossed-benzoin reaction: mechanism, regioselectivity, stereoselectivity, and role of NHC.","date":"2016","source":"Organic & biomolecular chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27306484","citation_count":11,"is_preprint":false},{"pmid":"32856673","id":"PMC_32856673","title":"Solving the challenging synthesis of highly cytotoxic silver complexes bearing sterically hindered NHC ligands with mechanochemistry.","date":"2020","source":"Dalton transactions (Cambridge, England : 2003)","url":"https://pubmed.ncbi.nlm.nih.gov/32856673","citation_count":11,"is_preprint":false},{"pmid":"28186538","id":"PMC_28186538","title":"Elevated HMGN4 expression potentiates thyroid tumorigenesis.","date":"2017","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/28186538","citation_count":10,"is_preprint":false},{"pmid":"36830276","id":"PMC_36830276","title":"Biological Activities of Ruthenium NHC Complexes: An Update.","date":"2023","source":"Antibiotics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/36830276","citation_count":10,"is_preprint":false},{"pmid":"36535039","id":"PMC_36535039","title":"Reactivity and Enantioselectivity in NHC Organocatalysis Provide Evidence for the Complex Role of Modifications at the Secondary Sphere.","date":"2022","source":"Journal of the American Chemical Society","url":"https://pubmed.ncbi.nlm.nih.gov/36535039","citation_count":10,"is_preprint":false},{"pmid":"32529828","id":"PMC_32529828","title":"Unveiling the Chemo- and Stereoselectivities of NHC-Catalyzed Reactions of an Aliphatic Ester with Aminochalcone.","date":"2020","source":"The Journal of organic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32529828","citation_count":10,"is_preprint":false},{"pmid":"34163649","id":"PMC_34163649","title":"Design, scope and mechanism of highly active and selective chiral NHC-iridium catalysts for the intramolecular hydroamination of a variety of unactivated aminoalkenes.","date":"2021","source":"Chemical science","url":"https://pubmed.ncbi.nlm.nih.gov/34163649","citation_count":10,"is_preprint":false},{"pmid":"33401664","id":"PMC_33401664","title":"Transamidation of Amides and Amidation of Esters by Selective N-C(O)/O-C(O) Cleavage Mediated by Air- and Moisture-Stable Half-Sandwich Nickel(II)-NHC Complexes.","date":"2021","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/33401664","citation_count":10,"is_preprint":false},{"pmid":"34460127","id":"PMC_34460127","title":"Ru-NHC-Catalyzed Asymmetric Hydrogenation of 2-Quinolones to Chiral 3,4-Dihydro-2-Quinolones.","date":"2021","source":"Angewandte Chemie (International ed. in English)","url":"https://pubmed.ncbi.nlm.nih.gov/34460127","citation_count":10,"is_preprint":false},{"pmid":"26250720","id":"PMC_26250720","title":"4-Alkylated Silver-N-Heterocyclic Carbene (NHC) Complexes with Cytotoxic Effects in Leukemia Cells.","date":"2015","source":"ChemMedChem","url":"https://pubmed.ncbi.nlm.nih.gov/26250720","citation_count":10,"is_preprint":false},{"pmid":"25879346","id":"PMC_25879346","title":"Cytotoxic potency of self-assembled Ruthenium(II)-NHC complexes with pincer type 2, 6-bis(N-methylimidazolylidene/benzimidazolylidene)pyrazine ligands.","date":"2015","source":"Journal of cancer research and therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/25879346","citation_count":10,"is_preprint":false},{"pmid":"37221959","id":"PMC_37221959","title":"Single-Crystal to Single-Crystal Transformations: Stepwise CO2 Insertions into Bridging Hydrides of [(NHC)CuH]2 Complexes.","date":"2023","source":"Angewandte Chemie (International ed. in English)","url":"https://pubmed.ncbi.nlm.nih.gov/37221959","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46745,"output_tokens":907,"usd":0.07692,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7031,"output_tokens":1189,"usd":0.03244,"stage2_stop_reason":"end_turn"},"total_usd":0.10936,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the 100 abstracts, I need to identify papers that are actually about the canonical HMGN4 protein (also known as NHC/HMG17L3), a nucleosome-binding protein.\n\nThe vast majority of papers (1-29, 31-100 with a few exceptions) are about N-Heterocyclic Carbene (NHC) chemistry in organometallic/organocatalysis contexts — a completely different meaning of \"NHC.\" The IOBA-NHC papers (4, 18, 50) are about a conjunctival cell line, not the HMGN4 protein. Paper 77 is about Drosophila NHC (non-histone chromosomal) proteins, which may be tangentially related but describes a different organism's proteins in a general context.\n\nPapers clearly about HMGN4 protein:\n- **PMID 11410162** (paper 30): Discovery/characterization of HMGN4\n- **PMID 28186538** (paper 91): HMGN4 in thyroid tumorigenesis\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"HMGN4 (encoded by an intronless gene at chromosome 6p21.3) is a nuclear protein closely related to HMGN2 that localizes to the nucleus in HeLa cells and binds nucleosomes, expanding the HMGN protein family of nucleosome-binding proteins.\",\n      \"method\": \"Western blot with antibody against unique HMGN4 region, transfection of HeLa cells with HMGN4-GFP fusion for nuclear localization, Northern blot for tissue expression\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct localization by live fluorescence imaging of GFP fusion and Western blot detection; single lab with multiple methods but no functional mechanistic follow-up beyond localization\",\n      \"pmids\": [\"11410162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of HMGN4 in mouse and human cells alters the cellular transcription profile, downregulates tumor suppressors Atm, Atrx, and Brca2, elevates the DNA damage marker γH2AX, and increases tumorigenicity as measured by colony formation and tumor generation in nude mice; transgenic mice overexpressing HMGN4 in the thyroid develop preneoplastic lesions, establishing HMGN4 as an epigenetic factor that potentiates thyroid oncogenesis.\",\n      \"method\": \"Transgenic mouse overexpression, colony formation assays, nude mouse tumor xenograft, transcriptomic profiling, γH2AX immunostaining, gene expression analysis\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular and in vivo phenotypes from loss/gain-of-function with pathway placement (epigenetic regulation of tumor suppressor expression), single lab with multiple orthogonal assays\",\n      \"pmids\": [\"28186538\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HMGN4 is an intronless-gene-encoded nucleosome-binding protein that localizes to the nucleus, belongs to the HMGN family, modulates the cellular transcription profile by downregulating tumor suppressors (Atm, Atrx, Brca2), elevates DNA damage signaling (γH2AX), and potentiates thyroid tumorigenesis when overexpressed.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HMGN4 is a nuclear nucleosome-binding protein of the HMGN family that modulates chromatin and transcription, encoded by an intronless gene at chromosome 6p21.3 and closely related to HMGN2 [#0]. It localizes to the nucleus and binds nucleosomes [#0], and when overexpressed it reshapes the cellular transcription profile—downregulating the tumor suppressors Atm, Atrx, and Brca2, elevating the DNA damage marker \\u03b3H2AX, and increasing tumorigenicity in colony-formation and xenograft assays; thyroid-targeted transgenic overexpression drives preneoplastic lesions, establishing HMGN4 as an epigenetic potentiator of thyroid oncogenesis [#1]. Beyond these findings, the molecular details of how HMGN4 binding to nucleosomes effects transcriptional repression of specific tumor suppressors have not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing whether HMGN4 is a bona fide member of the nucleosome-binding HMGN family answered where this protein acts and how it engages chromatin.\",\n      \"evidence\": \"Western blot with a region-specific antibody, HMGN4-GFP fusion live imaging in HeLa cells, and Northern blot tissue profiling\",\n      \"pmids\": [\"11410162\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of nucleosome binding tested\", \"No mapping of genomic binding sites\", \"Relationship to other HMGN paralogs at shared sites unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Determining the cellular consequence of HMGN4 dosage showed it functions as an epigenetic factor that represses tumor suppressors and promotes tumorigenesis.\",\n      \"evidence\": \"Transgenic mouse thyroid overexpression, transcriptomic profiling, \\u03b3H2AX immunostaining, colony-formation and nude-mouse xenograft assays\",\n      \"pmids\": [\"28186538\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct chromatin occupancy at Atm/Atrx/Brca2 loci not demonstrated\", \"Mechanism linking nucleosome binding to gene repression unknown\", \"Loss-of-function phenotype in normal physiology not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HMGN4 nucleosome binding is mechanistically coupled to transcriptional repression of specific tumor suppressors and to DNA damage signaling remains unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No genome-wide binding map\", \"No structural basis for target selectivity\", \"No identified protein partners or chromatin co-factors\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":2,"faith_total":2,"faith_pct":100.0}}