{"gene":"HMGN5","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2009,"finding":"HMGN5 (NSBP1) is specifically targeted by its C-terminal domain to nucleosomes in euchromatin, interacts with linker histones in living cells via its negatively charged C-terminal domain interacting with the positively charged C-terminal domain of histone H5, and counteracts linker histone-mediated compaction of nucleosomal arrays, thereby modulating transcription of numerous genes.","method":"FRAP (live cell imaging), Co-IP, in vitro nucleosomal array compaction assay, domain mutagenesis, transcriptome analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including live-cell imaging, biochemical interaction assays, in vitro reconstitution, and transcriptomics in a single study","pmids":["19748358"],"is_preprint":false},{"year":2011,"finding":"Human HMGN5 has a rapidly evolving acidic C-terminal domain that determines chromatin interaction properties; both mouse and human HMGN5 interact with histone H1, reduce its chromatin residence time, and induce large-scale chromatin decompaction in living cells. Distinct domains of HMGN5 affect specific steps in H1–chromatin interaction.","method":"FRAP, domain mutagenesis, live-cell imaging of H1 dynamics, transcriptome analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — domain mutagenesis combined with live-cell FRAP and transcriptomics, multiple orthogonal methods","pmids":["21518955"],"is_preprint":false},{"year":2013,"finding":"The N-terminal domain of HMGN5 interacts with the C-terminal domain of the lamin-binding protein LAP2α; loss of either protein reciprocally alters genome-wide chromatin distribution of the other, establishing a functional link between chromatin-binding and lamin-binding proteins.","method":"Co-IP (domain mapping), chromatin immunoprecipitation (ChIP) in HMGN5- or LAP2α-knockout cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with domain mapping and genome-wide ChIP in knockout cells","pmids":["23673662"],"is_preprint":false},{"year":2015,"finding":"Chromatin decompaction by HMGN5 decreases nuclear sturdiness, elasticity, and rigidity in cultured cells; in vivo, cardiac-specific HMGN5 overexpression causes heterochromatin loss, deformed nuclei with disrupted lamina, and hypertrophic cardiomyopathy, demonstrating that heterochromatin supports nuclear mechanical integrity against the forces of cardiac contraction.","method":"Atomic force microscopy (nuclear stiffness), transgenic mouse overexpression (global and cardiac-specific), electron microscopy, immunofluorescence of lamina","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — in vivo genetic model plus direct biophysical measurements, strong mechanistic and phenotypic evidence","pmids":["25609380"],"is_preprint":false},{"year":2014,"finding":"Loss of the nucleosome-binding domain of HMGN5 in mice leads to altered chromatin structure at the Gpx6 and Hk1 loci (shown by DNase I hypersensitivity), decreased expression of these glutathione-metabolism genes, and elevated hepatic glutathione levels, revealing a role for HMGN5 in regulating chromatin accessibility and transcription of metabolic genes in vivo.","method":"Targeted knockout mouse, DNase I chromatin accessibility assay, metabolomics, microarray/qPCR","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 — knockout mouse with in vivo chromatin structure assay and metabolomics, multiple orthogonal methods","pmids":["24392144"],"is_preprint":false},{"year":2015,"finding":"HMGN5 mRNA localizes to growth cones of hippocampal and neuron-like cells where it can be locally translated; HMGN5 is retrogradely transported from growth cones to the nucleus, loss of HMGN5 impairs neurite outgrowth and induces transcriptional changes, and these effects depend on growth cone localization of the Hmgn5 mRNA.","method":"Live-cell fluorescence microscopy (mRNA localization), retrograde transport assay, siRNA knockdown/overexpression with neurite outgrowth readout, transcriptome analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — direct localization with functional consequence, loss-of-function with defined phenotype, multiple orthogonal approaches","pmids":["25825524"],"is_preprint":false},{"year":2019,"finding":"HMGN5 protein counteracts the inhibitory effect of histone H1 on distant enhancer–promoter communication in a defined in vitro chromatin system; H1-mediated inhibition is tail-dependent, and HMGN5 relieves this inhibition, suggesting HMGN5 modulates chromatin fiber dynamics to facilitate long-range gene regulation.","method":"In vitro reconstituted chromatin enhancer–promoter communication assay, H1 tail mutants","journal":"Molekuliarnaia biologiia","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro reconstitution, single lab, single study","pmids":["31876282"],"is_preprint":false},{"year":2016,"finding":"Hmgn5 acts downstream of Hoxa10 in uterine stromal cells to mediate cAMP/progesterone-induced decidualization: Hoxa10 knockdown suppresses Prl8a2/Prl3c1 expression, and Hmgn5 overexpression rescues this defect; Hmgn5 also regulates Cox-2, Vegf, and Mmp2 expression during decidualization.","method":"siRNA knockdown, overexpression rescue experiments, epistasis analysis in mouse uterine stromal cells","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with rescue experiment, single lab","pmids":["27579887"],"is_preprint":false},{"year":2010,"finding":"HMGN5 knockdown in prostate cancer DU145 cells induces G2/M cell cycle arrest and apoptosis, decreasing cyclin B1 and Bcl-2 mRNA and protein levels, and suppresses tumor growth in nude mice.","method":"Lentiviral shRNA knockdown, flow cytometry, MTT assay, xenograft mouse model, Western blot/RT-PCR","journal":"Asian journal of andrology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype and pathway marker changes, in vitro and in vivo","pmids":["20531280"],"is_preprint":false},{"year":2012,"finding":"HMGN5 siRNA in LNCaP prostate cancer cells induces apoptosis via mitochondrial pathway: loss of mitochondrial membrane potential, increased Bax/Bcl-2 ratio, and activation of caspase-3.","method":"siRNA knockdown, Annexin V/TUNEL apoptosis assay, JC-1 mitochondrial membrane potential, Western blot, caspase activity assay","journal":"Asian journal of andrology","confidence":"Medium","confidence_rationale":"Tier 2 — KD with multiple mechanistic readouts in single lab","pmids":["22504871"],"is_preprint":false},{"year":2011,"finding":"HMGN5 knockdown in bladder cancer EJ cells causes G2/M arrest, reduces cyclin B1, and decreases MMP-9 activity (but not MMP-2), suggesting HMGN5 promotes bladder cancer invasion through MMP-9 upregulation.","method":"RNAi knockdown, flow cytometry, gelatin zymography for MMP activity, Western blot","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 2 — KD with multiple phenotypic and molecular readouts, single lab","pmids":["21695596"],"is_preprint":false},{"year":2017,"finding":"HMGN5 positively regulates phospho-Akt in bladder cancer cells; HMGN5 knockdown decreases p-Akt, slug, E-cadherin, and VEGF-C while increasing cytochrome c, cleaved-caspase-3, and cleaved-PARP; IGF-1 (PI3K/Akt activator) reverses these effects, placing HMGN5 upstream of PI3K/Akt signaling to modulate cisplatin sensitivity.","method":"siRNA knockdown, IGF-1 rescue experiment, Western blot, clonogenic assay, flow cytometry","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 2 — pathway rescue with PI3K/Akt activator and multiple molecular readouts, single lab","pmids":["29163683"],"is_preprint":false},{"year":2014,"finding":"HMGN5 knockdown in prostate cancer cells increases mitochondrial ROS, suppresses MnSOD induction upon ionizing radiation, and decreases Bcl-2/Bcl-xL, increasing radiosensitivity; MnSOD knockdown phenocopies HMGN5 loss, linking HMGN5 to the antioxidant MnSOD pathway in radiation response.","method":"siRNA knockdown, clonogenic assay, flow cytometry, ROS measurement (DHR 123), Western blot, comet assay","journal":"The Prostate","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods with mechanistic pathway linkage via MnSOD knockdown phenocopy, single lab","pmids":["25307178"],"is_preprint":false},{"year":2020,"finding":"HMGN5 interacts with Hsp27 in bladder cancer cells; this interaction modulates IL-6-induced EMT and invasion by regulating STAT3 phosphorylation and STAT3-mediated transcription of Twist, promoting tumor growth in xenograft models.","method":"Co-IP (protein interaction), siRNA knockdown, Western blot for STAT3 phosphorylation, luciferase reporter (Twist promoter), xenograft mouse model","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct protein interaction shown by Co-IP with functional signaling readout and in vivo validation, single lab","pmids":["32315283"],"is_preprint":false},{"year":2022,"finding":"Active STAT3 transcriptionally drives HMGN5 expression, and HMGN5 in turn escorts STAT3 to shape the oncogenic chromatin landscape and transcriptional program in breast cancer, forming a feed-forward loop that promotes tumor formation.","method":"3D sphere tumor model, siRNA knockdown, ChIP-seq (chromatin landscape), transcriptomic analysis, xenograft with nanoparticle siRNA delivery","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq and functional in vivo rescue, single lab, moderate evidence","pmids":["36066963"],"is_preprint":false},{"year":2009,"finding":"NSBP1 (HMGN5) is highly expressed in mouse placenta and modulates the expression of prolactin gene family members in differentiating trophoblast Rcho-1 cells without affecting levels of key transcription factors, suggesting its mechanism acts via chromatin structural changes.","method":"siRNA knockdown, overexpression, RT-PCR/Western blot for prolactin family markers and transcription factors","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — KD and OE with specific marker readout, single lab, no direct chromatin assay","pmids":["19160411"],"is_preprint":false},{"year":2025,"finding":"lncMB3 directly binds HMGN5 mRNA and inhibits its translation, reducing HMGN5 protein levels and thereby regulating the TGF-β pathway and inhibiting apoptosis in Group 3 Medulloblastoma; silencing lncMB3 derepresses HMGN5 protein and modulates OTX2-driven apoptotic programs.","method":"RNA interactome (transcriptomic and interactomic analyses), antisense oligonucleotide targeting, Western blot for HMGN5 protein, apoptosis assays, in vitro cisplatin synergy","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — direct RNA–RNA interaction with functional apoptosis readout, single lab with multiple approaches","pmids":["41198629"],"is_preprint":false}],"current_model":"HMGN5 is a nucleosome-binding architectural protein that uses its C-terminal domain to bind preferentially to euchromatin nucleosomes, displaces linker histone H1 to reduce chromatin compaction and increase enhancer–promoter communication, thereby broadly modulating transcription; it interacts with LAP2α to link chromatin architecture to the nuclear lamina for nuclear mechanical stability, is locally translated from growth-cone-localized mRNA to couple neuronal signaling to nuclear chromatin state, and in cancer contexts activates PI3K/Akt and MAPK signaling, interacts with Hsp27 to relay IL-6/STAT3-driven EMT, and forms a feed-forward loop with STAT3 to sustain an oncogenic chromatin landscape."},"narrative":{"teleology":[{"year":2009,"claim":"The fundamental mechanism by which HMGN5 influences chromatin was established: its C-terminal domain targets euchromatic nucleosomes, directly counteracts linker histone H1-mediated compaction, and broadly modulates transcription — resolving how an HMGN variant could globally alter chromatin architecture.","evidence":"FRAP, Co-IP, in vitro nucleosomal array compaction, domain mutagenesis, and transcriptomics in mammalian cells","pmids":["19748358"],"confidence":"High","gaps":["No genome-wide mapping of HMGN5 occupancy on chromatin","Structural basis of HMGN5–H1 interaction unresolved","In vivo physiological consequence of HMGN5 loss not yet tested"]},{"year":2011,"claim":"The rapidly evolving acidic C-terminal domain was shown to be the key determinant of species-specific chromatin interaction, with distinct HMGN5 domains affecting different steps in H1–chromatin binding — refining the modular logic of the H1-displacement mechanism.","evidence":"FRAP with domain mutants and H1 dynamics measurement in living cells","pmids":["21518955"],"confidence":"High","gaps":["Precise stoichiometry of HMGN5 versus H1 on nucleosomal arrays unknown","Whether HMGN5 competes with H1 at all genomic loci or only a subset"]},{"year":2013,"claim":"HMGN5 was linked to the nuclear lamina through its N-terminal interaction with LAP2α, and reciprocal knockout experiments showed that each protein influences the genome-wide chromatin distribution of the other — establishing a chromatin–lamina crosstalk axis.","evidence":"Reciprocal Co-IP with domain mapping and ChIP in HMGN5- or LAP2α-knockout cells","pmids":["23673662"],"confidence":"High","gaps":["Whether HMGN5–LAP2α interaction is direct or mediated by chromatin","Functional consequence of disrupting this interaction in vivo not tested"]},{"year":2014,"claim":"In vivo loss-of-function demonstrated that HMGN5 maintains chromatin accessibility at specific loci (Gpx6, Hk1), directly affecting hepatic glutathione metabolism — providing the first in vivo evidence that HMGN5's chromatin-opening activity has metabolic consequences.","evidence":"Targeted knockout mouse, DNase I hypersensitivity, metabolomics, microarray/qPCR","pmids":["24392144"],"confidence":"High","gaps":["Whether metabolic changes are cell-autonomous or systemic","Genome-wide chromatin accessibility map in knockout not performed"]},{"year":2015,"claim":"HMGN5-driven chromatin decompaction was shown to decrease nuclear mechanical integrity in vitro and in vivo; cardiac-specific overexpression caused heterochromatin loss, lamina disruption, and hypertrophic cardiomyopathy — directly demonstrating that chromatin compaction state supports nuclear structural resilience.","evidence":"Atomic force microscopy, cardiac-specific transgenic mouse, electron microscopy, immunofluorescence","pmids":["25609380"],"confidence":"High","gaps":["Whether endogenous HMGN5 levels regulate nuclear stiffness under physiological conditions","Contribution of LAP2α interaction versus H1 displacement to the mechanical phenotype not separated"]},{"year":2015,"claim":"HMGN5 mRNA was found localized to neuronal growth cones where it is locally translated and retrogradely transported to the nucleus, coupling peripheral signaling to nuclear chromatin remodeling and neurite outgrowth — revealing a novel spatial regulation strategy for a chromatin factor.","evidence":"Live-cell fluorescence microscopy, retrograde transport assay, siRNA knockdown with neurite outgrowth readout, transcriptomics in hippocampal and neuron-like cells","pmids":["25825524"],"confidence":"High","gaps":["Signal that triggers local translation not identified","Whether retrograde transport requires specific motor adaptors unknown","Genomic targets of growth-cone-derived HMGN5 in the nucleus not mapped"]},{"year":2019,"claim":"Using reconstituted chromatin, HMGN5 was shown to relieve H1-dependent inhibition of distant enhancer–promoter communication, providing a direct mechanistic link between H1 displacement and long-range gene regulation.","evidence":"In vitro reconstituted chromatin enhancer–promoter communication assay with H1 tail mutants","pmids":["31876282"],"confidence":"Medium","gaps":["In vivo validation of enhancer–promoter facilitation not performed","Whether HMGN5 acts at all enhancers or specific classes not addressed"]},{"year":2010,"claim":"Cancer-related functions emerged when HMGN5 knockdown in prostate cancer cells caused G2/M arrest, apoptosis, and suppressed xenograft growth, implicating HMGN5 in cell-cycle progression and survival of cancer cells.","evidence":"Lentiviral shRNA, flow cytometry, MTT assay, nude mouse xenograft, Western blot/RT-PCR in DU145 cells","pmids":["20531280"],"confidence":"Medium","gaps":["Direct chromatin targets mediating the cell-cycle effect not identified","Whether effects are cancer-specific or reflect general HMGN5 function unclear"]},{"year":2017,"claim":"HMGN5 was placed upstream of PI3K/Akt signaling in bladder cancer: HMGN5 knockdown decreased p-Akt and downstream EMT/survival markers, and IGF-1 rescue reversed these effects — defining an HMGN5–PI3K/Akt axis that modulates cisplatin sensitivity.","evidence":"siRNA, IGF-1 rescue, Western blot, clonogenic assay, flow cytometry in bladder cancer cells","pmids":["29163683"],"confidence":"Medium","gaps":["Whether HMGN5 activates PI3K/Akt via transcriptional upregulation of a pathway component or through a non-transcriptional mechanism","Not tested in non-cancer cell types"]},{"year":2020,"claim":"A physical interaction between HMGN5 and Hsp27 was identified, through which HMGN5 modulates IL-6-induced STAT3 phosphorylation, Twist transcription, and EMT in bladder cancer — connecting HMGN5 to cytokine-driven invasion.","evidence":"Co-IP, siRNA, Western blot for p-STAT3, Twist promoter luciferase reporter, xenograft model","pmids":["32315283"],"confidence":"Medium","gaps":["Whether HMGN5–Hsp27 interaction is direct or bridged by chromatin/other proteins","Stoichiometry and subcellular site of the interaction not characterized"]},{"year":2022,"claim":"A feed-forward loop was delineated in breast cancer: STAT3 transcriptionally activates HMGN5, and HMGN5 in turn escorts STAT3 to shape the chromatin landscape, sustaining an oncogenic transcriptional program — unifying the chromatin-architectural and signaling roles of HMGN5 in cancer.","evidence":"ChIP-seq, transcriptomics, 3D sphere tumor model, xenograft with nanoparticle siRNA delivery","pmids":["36066963"],"confidence":"Medium","gaps":["Mechanism by which HMGN5 'escorts' STAT3 to chromatin not structurally resolved","Whether the feed-forward loop operates in non-breast-cancer contexts"]},{"year":null,"claim":"A genome-wide map of HMGN5 occupancy in normal tissues, the structural basis of HMGN5–nucleosome and HMGN5–H1 interactions, and the mechanism by which HMGN5 activates PI3K/Akt signaling remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of HMGN5 on the nucleosome","Genome-wide occupancy in primary tissues not mapped","How chromatin decompaction leads to activation of specific signaling pathways (PI3K/Akt, MAPK) remains mechanistically unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,4,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,3,5]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,3,4,14]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,4,14,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,13,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,9]}],"complexes":[],"partners":["H1","LAP2A","STAT3","HSPB1"],"other_free_text":[]},"mechanistic_narrative":"HMGN5 is a nucleosome-binding architectural protein that modulates higher-order chromatin structure by antagonizing linker histone H1, thereby regulating transcription, nuclear mechanics, and enhancer–promoter communication. Its negatively charged C-terminal domain targets HMGN5 to euchromatic nucleosomes, where it reduces H1 chromatin residence time and counteracts H1-mediated compaction of nucleosomal arrays; loss of HMGN5 alters chromatin accessibility at specific loci and changes expression of metabolic, developmental, and cell-cycle genes [PMID:19748358, PMID:21518955, PMID:24392144, PMID:31876282]. HMGN5 interacts with the lamin-associated protein LAP2α to couple chromatin organization to the nuclear lamina, and chromatin decompaction driven by HMGN5 overexpression reduces nuclear stiffness and, in cardiomyocytes, causes lamina disruption and hypertrophic cardiomyopathy [PMID:23673662, PMID:25609380]. In cancer contexts, HMGN5 sustains oncogenic transcription through a feed-forward loop with STAT3 that shapes the chromatin landscape, interacts with Hsp27 to relay IL-6/STAT3-driven epithelial–mesenchymal transition, and modulates PI3K/Akt signaling to influence apoptosis and chemosensitivity [PMID:36066963, PMID:32315283, PMID:29163683]."},"prefetch_data":{"uniprot":{"accession":"P82970","full_name":"High mobility group nucleosome-binding domain-containing protein 5","aliases":["Nucleosome-binding protein 1"],"length_aa":282,"mass_kda":31.5,"function":"Preferentially binds to euchromatin and modulates cellular transcription by counteracting linker histone-mediated chromatin compaction","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P82970/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HMGN5","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000198157","cell_line_id":"CID001538","localizations":[{"compartment":"chromatin","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"H1F0","stoichiometry":10.0},{"gene":"PARP1","stoichiometry":10.0},{"gene":"BANF1","stoichiometry":4.0},{"gene":"WHSC1","stoichiometry":4.0},{"gene":"SMARCA5","stoichiometry":4.0},{"gene":"TOP2A","stoichiometry":4.0},{"gene":"NEDD8;NEDD8-MDP1","stoichiometry":4.0},{"gene":"H1FX","stoichiometry":4.0},{"gene":"BAZ1B","stoichiometry":4.0},{"gene":"H2AFY2","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001538","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":100.2}],"url":"https://www.proteinatlas.org/search/HMGN5"},"hgnc":{"alias_symbol":[],"prev_symbol":["NSBP1"]},"alphafold":{"accession":"P82970","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P82970","model_url":"https://alphafold.ebi.ac.uk/files/AF-P82970-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P82970-F1-predicted_aligned_error_v6.png","plddt_mean":52.84},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HMGN5","jax_strain_url":"https://www.jax.org/strain/search?query=HMGN5"},"sequence":{"accession":"P82970","fasta_url":"https://rest.uniprot.org/uniprotkb/P82970.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P82970/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P82970"}},"corpus_meta":[{"pmid":"22109888","id":"PMC_22109888","title":"Neonatal exposure to estradiol/bisphenol A alters promoter 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and invasion of human urothelial bladder cancer 5637 cells in vitro and in vivo.","date":"2015","source":"Medical oncology (Northwood, London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/25796505","citation_count":15,"is_preprint":false},{"pmid":"29163683","id":"PMC_29163683","title":"Knockdown of HMGN5 increases the chemosensitivity of human urothelial bladder cancer cells to cisplatin by targeting PI3K/Akt signaling.","date":"2017","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/29163683","citation_count":14,"is_preprint":false},{"pmid":"19160411","id":"PMC_19160411","title":"The nucleosomal binding protein NSBP1 is highly expressed in the placenta and modulates the expression of differentiation markers in placental Rcho-1 cells.","date":"2009","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19160411","citation_count":14,"is_preprint":false},{"pmid":"23255046","id":"PMC_23255046","title":"NSBP-1 mediates the effects of 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temozolomide in meningiomas.","date":"2015","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/26315299","citation_count":11,"is_preprint":false},{"pmid":"30128022","id":"PMC_30128022","title":"HMGN5 promotes proliferation and invasion via the activation of Wnt/β-catenin signaling pathway in pancreatic ductal adenocarcinoma.","date":"2018","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/30128022","citation_count":11,"is_preprint":false},{"pmid":"21518955","id":"PMC_21518955","title":"Distinct properties of human HMGN5 reveal a rapidly evolving but functionally conserved nucleosome binding protein.","date":"2011","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/21518955","citation_count":11,"is_preprint":false},{"pmid":"28914995","id":"PMC_28914995","title":"Silencing HMGN5 suppresses cell growth and promotes chemosensitivity in esophageal squamous cell carcinoma.","date":"2017","source":"Journal of biochemical and molecular toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/28914995","citation_count":10,"is_preprint":false},{"pmid":"25572120","id":"PMC_25572120","title":"Expression of oncogenic HMGN5 increases the sensitivity of prostate cancer cells to gemcitabine.","date":"2014","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/25572120","citation_count":9,"is_preprint":false},{"pmid":"24392144","id":"PMC_24392144","title":"Metabolomics reveals a role for the chromatin-binding protein HMGN5 in glutathione metabolism.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24392144","citation_count":9,"is_preprint":false},{"pmid":"31930127","id":"PMC_31930127","title":"Hypoxia-Inducible Factor 1A Upregulates HMGN5 by Increasing the Expression of GATA1 and Plays a Role in Osteosarcoma Metastasis.","date":"2019","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/31930127","citation_count":9,"is_preprint":false},{"pmid":"25307178","id":"PMC_25307178","title":"HMGN5 knockdown sensitizes prostate cancer cells to ionizing radiation.","date":"2014","source":"The Prostate","url":"https://pubmed.ncbi.nlm.nih.gov/25307178","citation_count":9,"is_preprint":false},{"pmid":"36066963","id":"PMC_36066963","title":"HMGN5 Escorts Oncogenic STAT3 Signaling by Regulating the Chromatin Landscape in Breast Cancer Tumorigenesis.","date":"2022","source":"Molecular cancer research : MCR","url":"https://pubmed.ncbi.nlm.nih.gov/36066963","citation_count":8,"is_preprint":false},{"pmid":"22994738","id":"PMC_22994738","title":"Knockdown of HMGN5 expression by RNA interference induces cell cycle arrest in human lung cancer cells.","date":"2012","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/22994738","citation_count":7,"is_preprint":false},{"pmid":"35261900","id":"PMC_35261900","title":"Circular RNA circTADA2A promotes the proliferation, invasion, and migration of non-small cell lung cancer cells via the miR-450b-3p/HMGN5 signaling pathway.","date":"2022","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/35261900","citation_count":6,"is_preprint":false},{"pmid":"33629303","id":"PMC_33629303","title":"HMGN5 promotes invasion and migration of colorectal cancer through activating FGF/FGFR pathway.","date":"2021","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33629303","citation_count":5,"is_preprint":false},{"pmid":"32596388","id":"PMC_32596388","title":"HMGN5 Silencing Suppresses Cell Biological Progression via AKT/MAPK Pathway in Human Glioblastoma Cells.","date":"2020","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/32596388","citation_count":5,"is_preprint":false},{"pmid":"31876282","id":"PMC_31876282","title":"[Opposite Effects of Histone H1 and HMGN5 Protein on Distant Interactions in Chromatin].","date":"2019","source":"Molekuliarnaia biologiia","url":"https://pubmed.ncbi.nlm.nih.gov/31876282","citation_count":4,"is_preprint":false},{"pmid":"40348637","id":"PMC_40348637","title":"Novel IgG and IgA autoantibodies validated in two independent cohorts are associated with disease activity and determine organ manifestations in systemic lupus erythematosus: implications for anti-LIN28A, anti-HMGN5, anti-IRF5, and anti-TGIF1.","date":"2025","source":"Annals of the rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/40348637","citation_count":3,"is_preprint":false},{"pmid":"40487959","id":"PMC_40487959","title":"Circular RNA hsa_circRNA_101996 modulates gastric cancer cell proliferation and apoptosis through the miR-577/HMGN5 axis.","date":"2025","source":"World journal of gastrointestinal oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40487959","citation_count":1,"is_preprint":false},{"pmid":"41198629","id":"PMC_41198629","title":"The MYC-dependent lncRNA MB3 inhibits apoptosis in Group 3 Medulloblastoma by regulating the TGF-β pathway via HMGN5.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41198629","citation_count":0,"is_preprint":false},{"pmid":"34045871","id":"PMC_34045871","title":"miR-488 Inhibits Cell Growth and Metastasis in Renal Cell Carcinoma by Targeting HMGN5 [Retraction].","date":"2021","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/34045871","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.04.23.650160","title":"A New Serological Autoantibody Signature Associated with Multiple Sclerosis","date":"2025-04-26","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.23.650160","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.21.619459","title":"A circuit involving the lncRNA MB3 and the driver genes MYC and OTX2 inhibits apoptosis in Group 3 Medulloblastoma by regulating the TGF-β pathway via HMGN5","date":"2024-10-22","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.21.619459","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21589,"output_tokens":3921,"usd":0.061791},"stage2":{"model":"claude-opus-4-6","input_tokens":7398,"output_tokens":3161,"usd":0.174022},"total_usd":0.235813,"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\": 2009,\n      \"finding\": \"HMGN5 (NSBP1) is specifically targeted by its C-terminal domain to nucleosomes in euchromatin, interacts with linker histones in living cells via its negatively charged C-terminal domain interacting with the positively charged C-terminal domain of histone H5, and counteracts linker histone-mediated compaction of nucleosomal arrays, thereby modulating transcription of numerous genes.\",\n      \"method\": \"FRAP (live cell imaging), Co-IP, in vitro nucleosomal array compaction assay, domain mutagenesis, transcriptome analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including live-cell imaging, biochemical interaction assays, in vitro reconstitution, and transcriptomics in a single study\",\n      \"pmids\": [\"19748358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human HMGN5 has a rapidly evolving acidic C-terminal domain that determines chromatin interaction properties; both mouse and human HMGN5 interact with histone H1, reduce its chromatin residence time, and induce large-scale chromatin decompaction in living cells. Distinct domains of HMGN5 affect specific steps in H1–chromatin interaction.\",\n      \"method\": \"FRAP, domain mutagenesis, live-cell imaging of H1 dynamics, transcriptome analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — domain mutagenesis combined with live-cell FRAP and transcriptomics, multiple orthogonal methods\",\n      \"pmids\": [\"21518955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The N-terminal domain of HMGN5 interacts with the C-terminal domain of the lamin-binding protein LAP2α; loss of either protein reciprocally alters genome-wide chromatin distribution of the other, establishing a functional link between chromatin-binding and lamin-binding proteins.\",\n      \"method\": \"Co-IP (domain mapping), chromatin immunoprecipitation (ChIP) in HMGN5- or LAP2α-knockout cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with domain mapping and genome-wide ChIP in knockout cells\",\n      \"pmids\": [\"23673662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Chromatin decompaction by HMGN5 decreases nuclear sturdiness, elasticity, and rigidity in cultured cells; in vivo, cardiac-specific HMGN5 overexpression causes heterochromatin loss, deformed nuclei with disrupted lamina, and hypertrophic cardiomyopathy, demonstrating that heterochromatin supports nuclear mechanical integrity against the forces of cardiac contraction.\",\n      \"method\": \"Atomic force microscopy (nuclear stiffness), transgenic mouse overexpression (global and cardiac-specific), electron microscopy, immunofluorescence of lamina\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vivo genetic model plus direct biophysical measurements, strong mechanistic and phenotypic evidence\",\n      \"pmids\": [\"25609380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of the nucleosome-binding domain of HMGN5 in mice leads to altered chromatin structure at the Gpx6 and Hk1 loci (shown by DNase I hypersensitivity), decreased expression of these glutathione-metabolism genes, and elevated hepatic glutathione levels, revealing a role for HMGN5 in regulating chromatin accessibility and transcription of metabolic genes in vivo.\",\n      \"method\": \"Targeted knockout mouse, DNase I chromatin accessibility assay, metabolomics, microarray/qPCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — knockout mouse with in vivo chromatin structure assay and metabolomics, multiple orthogonal methods\",\n      \"pmids\": [\"24392144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HMGN5 mRNA localizes to growth cones of hippocampal and neuron-like cells where it can be locally translated; HMGN5 is retrogradely transported from growth cones to the nucleus, loss of HMGN5 impairs neurite outgrowth and induces transcriptional changes, and these effects depend on growth cone localization of the Hmgn5 mRNA.\",\n      \"method\": \"Live-cell fluorescence microscopy (mRNA localization), retrograde transport assay, siRNA knockdown/overexpression with neurite outgrowth readout, transcriptome analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence, loss-of-function with defined phenotype, multiple orthogonal approaches\",\n      \"pmids\": [\"25825524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HMGN5 protein counteracts the inhibitory effect of histone H1 on distant enhancer–promoter communication in a defined in vitro chromatin system; H1-mediated inhibition is tail-dependent, and HMGN5 relieves this inhibition, suggesting HMGN5 modulates chromatin fiber dynamics to facilitate long-range gene regulation.\",\n      \"method\": \"In vitro reconstituted chromatin enhancer–promoter communication assay, H1 tail mutants\",\n      \"journal\": \"Molekuliarnaia biologiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution, single lab, single study\",\n      \"pmids\": [\"31876282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hmgn5 acts downstream of Hoxa10 in uterine stromal cells to mediate cAMP/progesterone-induced decidualization: Hoxa10 knockdown suppresses Prl8a2/Prl3c1 expression, and Hmgn5 overexpression rescues this defect; Hmgn5 also regulates Cox-2, Vegf, and Mmp2 expression during decidualization.\",\n      \"method\": \"siRNA knockdown, overexpression rescue experiments, epistasis analysis in mouse uterine stromal cells\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with rescue experiment, single lab\",\n      \"pmids\": [\"27579887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HMGN5 knockdown in prostate cancer DU145 cells induces G2/M cell cycle arrest and apoptosis, decreasing cyclin B1 and Bcl-2 mRNA and protein levels, and suppresses tumor growth in nude mice.\",\n      \"method\": \"Lentiviral shRNA knockdown, flow cytometry, MTT assay, xenograft mouse model, Western blot/RT-PCR\",\n      \"journal\": \"Asian journal of andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype and pathway marker changes, in vitro and in vivo\",\n      \"pmids\": [\"20531280\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HMGN5 siRNA in LNCaP prostate cancer cells induces apoptosis via mitochondrial pathway: loss of mitochondrial membrane potential, increased Bax/Bcl-2 ratio, and activation of caspase-3.\",\n      \"method\": \"siRNA knockdown, Annexin V/TUNEL apoptosis assay, JC-1 mitochondrial membrane potential, Western blot, caspase activity assay\",\n      \"journal\": \"Asian journal of andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with multiple mechanistic readouts in single lab\",\n      \"pmids\": [\"22504871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HMGN5 knockdown in bladder cancer EJ cells causes G2/M arrest, reduces cyclin B1, and decreases MMP-9 activity (but not MMP-2), suggesting HMGN5 promotes bladder cancer invasion through MMP-9 upregulation.\",\n      \"method\": \"RNAi knockdown, flow cytometry, gelatin zymography for MMP activity, Western blot\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with multiple phenotypic and molecular readouts, single lab\",\n      \"pmids\": [\"21695596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HMGN5 positively regulates phospho-Akt in bladder cancer cells; HMGN5 knockdown decreases p-Akt, slug, E-cadherin, and VEGF-C while increasing cytochrome c, cleaved-caspase-3, and cleaved-PARP; IGF-1 (PI3K/Akt activator) reverses these effects, placing HMGN5 upstream of PI3K/Akt signaling to modulate cisplatin sensitivity.\",\n      \"method\": \"siRNA knockdown, IGF-1 rescue experiment, Western blot, clonogenic assay, flow cytometry\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway rescue with PI3K/Akt activator and multiple molecular readouts, single lab\",\n      \"pmids\": [\"29163683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HMGN5 knockdown in prostate cancer cells increases mitochondrial ROS, suppresses MnSOD induction upon ionizing radiation, and decreases Bcl-2/Bcl-xL, increasing radiosensitivity; MnSOD knockdown phenocopies HMGN5 loss, linking HMGN5 to the antioxidant MnSOD pathway in radiation response.\",\n      \"method\": \"siRNA knockdown, clonogenic assay, flow cytometry, ROS measurement (DHR 123), Western blot, comet assay\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with mechanistic pathway linkage via MnSOD knockdown phenocopy, single lab\",\n      \"pmids\": [\"25307178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HMGN5 interacts with Hsp27 in bladder cancer cells; this interaction modulates IL-6-induced EMT and invasion by regulating STAT3 phosphorylation and STAT3-mediated transcription of Twist, promoting tumor growth in xenograft models.\",\n      \"method\": \"Co-IP (protein interaction), siRNA knockdown, Western blot for STAT3 phosphorylation, luciferase reporter (Twist promoter), xenograft mouse model\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct protein interaction shown by Co-IP with functional signaling readout and in vivo validation, single lab\",\n      \"pmids\": [\"32315283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Active STAT3 transcriptionally drives HMGN5 expression, and HMGN5 in turn escorts STAT3 to shape the oncogenic chromatin landscape and transcriptional program in breast cancer, forming a feed-forward loop that promotes tumor formation.\",\n      \"method\": \"3D sphere tumor model, siRNA knockdown, ChIP-seq (chromatin landscape), transcriptomic analysis, xenograft with nanoparticle siRNA delivery\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq and functional in vivo rescue, single lab, moderate evidence\",\n      \"pmids\": [\"36066963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NSBP1 (HMGN5) is highly expressed in mouse placenta and modulates the expression of prolactin gene family members in differentiating trophoblast Rcho-1 cells without affecting levels of key transcription factors, suggesting its mechanism acts via chromatin structural changes.\",\n      \"method\": \"siRNA knockdown, overexpression, RT-PCR/Western blot for prolactin family markers and transcription factors\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — KD and OE with specific marker readout, single lab, no direct chromatin assay\",\n      \"pmids\": [\"19160411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"lncMB3 directly binds HMGN5 mRNA and inhibits its translation, reducing HMGN5 protein levels and thereby regulating the TGF-β pathway and inhibiting apoptosis in Group 3 Medulloblastoma; silencing lncMB3 derepresses HMGN5 protein and modulates OTX2-driven apoptotic programs.\",\n      \"method\": \"RNA interactome (transcriptomic and interactomic analyses), antisense oligonucleotide targeting, Western blot for HMGN5 protein, apoptosis assays, in vitro cisplatin synergy\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA–RNA interaction with functional apoptosis readout, single lab with multiple approaches\",\n      \"pmids\": [\"41198629\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HMGN5 is a nucleosome-binding architectural protein that uses its C-terminal domain to bind preferentially to euchromatin nucleosomes, displaces linker histone H1 to reduce chromatin compaction and increase enhancer–promoter communication, thereby broadly modulating transcription; it interacts with LAP2α to link chromatin architecture to the nuclear lamina for nuclear mechanical stability, is locally translated from growth-cone-localized mRNA to couple neuronal signaling to nuclear chromatin state, and in cancer contexts activates PI3K/Akt and MAPK signaling, interacts with Hsp27 to relay IL-6/STAT3-driven EMT, and forms a feed-forward loop with STAT3 to sustain an oncogenic chromatin landscape.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HMGN5 is a nucleosome-binding architectural protein that modulates higher-order chromatin structure by antagonizing linker histone H1, thereby regulating transcription, nuclear mechanics, and enhancer–promoter communication. Its negatively charged C-terminal domain targets HMGN5 to euchromatic nucleosomes, where it reduces H1 chromatin residence time and counteracts H1-mediated compaction of nucleosomal arrays; loss of HMGN5 alters chromatin accessibility at specific loci and changes expression of metabolic, developmental, and cell-cycle genes [PMID:19748358, PMID:21518955, PMID:24392144, PMID:31876282]. HMGN5 interacts with the lamin-associated protein LAP2α to couple chromatin organization to the nuclear lamina, and chromatin decompaction driven by HMGN5 overexpression reduces nuclear stiffness and, in cardiomyocytes, causes lamina disruption and hypertrophic cardiomyopathy [PMID:23673662, PMID:25609380]. In cancer contexts, HMGN5 sustains oncogenic transcription through a feed-forward loop with STAT3 that shapes the chromatin landscape, interacts with Hsp27 to relay IL-6/STAT3-driven epithelial–mesenchymal transition, and modulates PI3K/Akt signaling to influence apoptosis and chemosensitivity [PMID:36066963, PMID:32315283, PMID:29163683].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"The fundamental mechanism by which HMGN5 influences chromatin was established: its C-terminal domain targets euchromatic nucleosomes, directly counteracts linker histone H1-mediated compaction, and broadly modulates transcription — resolving how an HMGN variant could globally alter chromatin architecture.\",\n      \"evidence\": \"FRAP, Co-IP, in vitro nucleosomal array compaction, domain mutagenesis, and transcriptomics in mammalian cells\",\n      \"pmids\": [\"19748358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No genome-wide mapping of HMGN5 occupancy on chromatin\",\n        \"Structural basis of HMGN5–H1 interaction unresolved\",\n        \"In vivo physiological consequence of HMGN5 loss not yet tested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The rapidly evolving acidic C-terminal domain was shown to be the key determinant of species-specific chromatin interaction, with distinct HMGN5 domains affecting different steps in H1–chromatin binding — refining the modular logic of the H1-displacement mechanism.\",\n      \"evidence\": \"FRAP with domain mutants and H1 dynamics measurement in living cells\",\n      \"pmids\": [\"21518955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Precise stoichiometry of HMGN5 versus H1 on nucleosomal arrays unknown\",\n        \"Whether HMGN5 competes with H1 at all genomic loci or only a subset\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"HMGN5 was linked to the nuclear lamina through its N-terminal interaction with LAP2α, and reciprocal knockout experiments showed that each protein influences the genome-wide chromatin distribution of the other — establishing a chromatin–lamina crosstalk axis.\",\n      \"evidence\": \"Reciprocal Co-IP with domain mapping and ChIP in HMGN5- or LAP2α-knockout cells\",\n      \"pmids\": [\"23673662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether HMGN5–LAP2α interaction is direct or mediated by chromatin\",\n        \"Functional consequence of disrupting this interaction in vivo not tested\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"In vivo loss-of-function demonstrated that HMGN5 maintains chromatin accessibility at specific loci (Gpx6, Hk1), directly affecting hepatic glutathione metabolism — providing the first in vivo evidence that HMGN5's chromatin-opening activity has metabolic consequences.\",\n      \"evidence\": \"Targeted knockout mouse, DNase I hypersensitivity, metabolomics, microarray/qPCR\",\n      \"pmids\": [\"24392144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether metabolic changes are cell-autonomous or systemic\",\n        \"Genome-wide chromatin accessibility map in knockout not performed\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"HMGN5-driven chromatin decompaction was shown to decrease nuclear mechanical integrity in vitro and in vivo; cardiac-specific overexpression caused heterochromatin loss, lamina disruption, and hypertrophic cardiomyopathy — directly demonstrating that chromatin compaction state supports nuclear structural resilience.\",\n      \"evidence\": \"Atomic force microscopy, cardiac-specific transgenic mouse, electron microscopy, immunofluorescence\",\n      \"pmids\": [\"25609380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether endogenous HMGN5 levels regulate nuclear stiffness under physiological conditions\",\n        \"Contribution of LAP2α interaction versus H1 displacement to the mechanical phenotype not separated\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"HMGN5 mRNA was found localized to neuronal growth cones where it is locally translated and retrogradely transported to the nucleus, coupling peripheral signaling to nuclear chromatin remodeling and neurite outgrowth — revealing a novel spatial regulation strategy for a chromatin factor.\",\n      \"evidence\": \"Live-cell fluorescence microscopy, retrograde transport assay, siRNA knockdown with neurite outgrowth readout, transcriptomics in hippocampal and neuron-like cells\",\n      \"pmids\": [\"25825524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Signal that triggers local translation not identified\",\n        \"Whether retrograde transport requires specific motor adaptors unknown\",\n        \"Genomic targets of growth-cone-derived HMGN5 in the nucleus not mapped\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Using reconstituted chromatin, HMGN5 was shown to relieve H1-dependent inhibition of distant enhancer–promoter communication, providing a direct mechanistic link between H1 displacement and long-range gene regulation.\",\n      \"evidence\": \"In vitro reconstituted chromatin enhancer–promoter communication assay with H1 tail mutants\",\n      \"pmids\": [\"31876282\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"In vivo validation of enhancer–promoter facilitation not performed\",\n        \"Whether HMGN5 acts at all enhancers or specific classes not addressed\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Cancer-related functions emerged when HMGN5 knockdown in prostate cancer cells caused G2/M arrest, apoptosis, and suppressed xenograft growth, implicating HMGN5 in cell-cycle progression and survival of cancer cells.\",\n      \"evidence\": \"Lentiviral shRNA, flow cytometry, MTT assay, nude mouse xenograft, Western blot/RT-PCR in DU145 cells\",\n      \"pmids\": [\"20531280\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct chromatin targets mediating the cell-cycle effect not identified\",\n        \"Whether effects are cancer-specific or reflect general HMGN5 function unclear\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"HMGN5 was placed upstream of PI3K/Akt signaling in bladder cancer: HMGN5 knockdown decreased p-Akt and downstream EMT/survival markers, and IGF-1 rescue reversed these effects — defining an HMGN5–PI3K/Akt axis that modulates cisplatin sensitivity.\",\n      \"evidence\": \"siRNA, IGF-1 rescue, Western blot, clonogenic assay, flow cytometry in bladder cancer cells\",\n      \"pmids\": [\"29163683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether HMGN5 activates PI3K/Akt via transcriptional upregulation of a pathway component or through a non-transcriptional mechanism\",\n        \"Not tested in non-cancer cell types\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A physical interaction between HMGN5 and Hsp27 was identified, through which HMGN5 modulates IL-6-induced STAT3 phosphorylation, Twist transcription, and EMT in bladder cancer — connecting HMGN5 to cytokine-driven invasion.\",\n      \"evidence\": \"Co-IP, siRNA, Western blot for p-STAT3, Twist promoter luciferase reporter, xenograft model\",\n      \"pmids\": [\"32315283\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether HMGN5–Hsp27 interaction is direct or bridged by chromatin/other proteins\",\n        \"Stoichiometry and subcellular site of the interaction not characterized\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A feed-forward loop was delineated in breast cancer: STAT3 transcriptionally activates HMGN5, and HMGN5 in turn escorts STAT3 to shape the chromatin landscape, sustaining an oncogenic transcriptional program — unifying the chromatin-architectural and signaling roles of HMGN5 in cancer.\",\n      \"evidence\": \"ChIP-seq, transcriptomics, 3D sphere tumor model, xenograft with nanoparticle siRNA delivery\",\n      \"pmids\": [\"36066963\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which HMGN5 'escorts' STAT3 to chromatin not structurally resolved\",\n        \"Whether the feed-forward loop operates in non-breast-cancer contexts\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A genome-wide map of HMGN5 occupancy in normal tissues, the structural basis of HMGN5–nucleosome and HMGN5–H1 interactions, and the mechanism by which HMGN5 activates PI3K/Akt signaling remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of HMGN5 on the nucleosome\",\n        \"Genome-wide occupancy in primary tissues not mapped\",\n        \"How chromatin decompaction leads to activation of specific signaling pathways (PI3K/Akt, MAPK) remains mechanistically unclear\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 4, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 3, 5]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 3, 4, 14]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 4, 14, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 13, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"H1\",\n      \"LAP2A\",\n      \"STAT3\",\n      \"HSPB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}