{"gene":"HMGN2","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1999,"finding":"PCAF acetyltransferase specifically acetylates HMGN2 (HMG-17) at lysine 2 (K2), but not the closely related HMG-14. This acetylation is confirmed as a predominant in vivo modification site. Acetylation of HMGN2 reduces its binding affinity to nucleosome core particles (measured by equilibrium dialysis). Conversely, binding of HMGN2 to nucleosome cores inhibits PCAF-mediated acetylation of histone H3, suggesting that HMGN2 acetylation precedes histone acetylation in transcriptionally active chromatin.","method":"In vitro acetyltransferase assay with PCAF, mass spectrometry sequence analysis to identify K2 acetylation site, equilibrium dialysis to measure nucleosome binding affinity, HMG-17 deletion mutants and competition studies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with mutagenesis/deletion mutants, mass spectrometry site identification, equilibrium dialysis binding assay, and in vivo validation of the acetylation site, all in a single rigorous study","pmids":["10207070"],"is_preprint":false},{"year":1995,"finding":"HMGN2 (HMG17) functions as a chromatin-specific transcriptional coactivator that increases the efficiency of transcription initiation by RNA polymerase II. This effect requires incorporation of HMGN2 into chromatin (not naked DNA templates) during chromatin assembly and depends on the presence of a sequence-specific activator (GAL4-VP16). HMGN2 in chromatin produced 7- to 40-fold stimulation of activated transcription but had no effect on transcriptional elongation.","method":"In vitro transcription assay using reconstituted chromatin templates (regularly spaced nucleosomal arrays) with and without HMGN2, structural analysis of HMG17-containing chromatin, comparison of chromatin vs. non-nucleosomal templates","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted chromatin system with in vitro transcription assay, multiple controls (chromatin vs. naked DNA, presence/absence of activator), rigorous mechanistic dissection in a single focused study","pmids":["7649479"],"is_preprint":false},{"year":1994,"finding":"Hydroxyl radical footprinting mapped the positions of HMGN2 (HMG-17) and HMG-14 on nucleosome cores and H1/H5-depleted chromatosomes. Both proteins occupy identical sites: protecting DNA ~25 bp from the end of nucleosomal DNA and in each of the two major grooves flanking the dyad axis. Two molecules of HMGN2 bind per nucleosome core, bridging two adjacent DNA strands on the surface of the particle. Binding sites near the dyad overlap with those of linker histones H1/H5.","method":"Hydroxyl radical footprinting of HMG-14 and HMG-17 bound to isolated nucleosome cores and chromatosomes","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct structural footprinting assay with quantitative mapping of protein-DNA contacts, rigorous reconstitution approach","pmids":["8107104"],"is_preprint":false},{"year":1992,"finding":"The nucleosome-binding domain of HMGN2 (HMG-17), a 30 amino acid peptide, functions as an independent module. This peptide specifically shifts nucleosome core mobility, elevates the Tm of core particles, and protects the same DNase I cleavage sites as the intact protein. Binding of both the peptide and intact protein requires the histone tails (lost upon trypsin digestion). The nucleosomal binding sites of the peptide are identical to those of the intact protein, establishing the modular architecture of HMGN2.","method":"Mobility shift assay, thermal denaturation (Tm measurement), DNase I digestion protection assay with synthetic peptides corresponding to HMGN2 domains; trypsin digestion of histone tails","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal in vitro biochemical assays (EMSA, thermal denaturation, DNase I footprinting) with peptide dissection, all in a single rigorous study","pmids":["1453455"],"is_preprint":false},{"year":1998,"finding":"HMGN2 (HMG-17) stimulates replication efficiency of a chromatin template. HMGN2 incorporated into SV40 minichromosomes during assembly induces extended chromatin structure and enhances the rate of replication in an in vitro SV40 replication system. The effect is chromatin-specific (not seen with protein-free DNA) and requires HMGN2 incorporation during, not after, chromatin assembly.","method":"In vitro SV40 replication assay using Xenopus egg extract-assembled minichromosomes with or without HMGN2; structural analysis of chromatin","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with functional replication assay, chromatin vs. naked DNA controls, timing-of-incorporation control, single rigorous study","pmids":["9545265"],"is_preprint":false},{"year":1993,"finding":"HMGN2 (HMG-17) is incorporated into nascent chromatin during replication in Xenopus egg extracts, prior to completion of chromatin assembly. It stabilizes nucleosomal core structure, improves the periodicity of nucleosomal spacing in nascent chromatin, and significantly increases the transcriptional potential of assembled chromatin (5S RNA gene and satellite I chromatin). The increase in transcriptional potential is observed only when HMGN2 is incorporated during chromatin assembly, not after.","method":"Cell-free Xenopus egg extract replication system; in vitro transcription assays; nucleosomal ladder analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted cell-free system, in vitro transcription assay, timing-of-incorporation controls, multiple functional readouts","pmids":["8404854"],"is_preprint":false},{"year":1998,"finding":"HMGN2 (HMG-17) is released from chromatin during mitosis (not present on metaphase/anaphase chromosomes) and actively reimported into the nucleus in late telophase concomitant with nuclear envelope formation. Import is energy-dependent, requires importin alpha, and is mediated by an intrinsic bipartite nuclear localization signal in HMGN2. Thus, the cell-cycle-regulated association of HMGN2 with chromatin is dependent on nuclear import processes.","method":"Immunofluorescence colocalization across cell cycle stages, reconstituted nuclei and permeabilized cell nuclear import assays, energy depletion and importin alpha inhibition experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments across cell cycle, functional nuclear import reconstitution with defined inhibition of importin alpha, replicated across HMG-14 and HMG-17","pmids":["9852141"],"is_preprint":false},{"year":1998,"finding":"In transcriptionally active cells, HMGN2 (HMG-17) colocalizes with sites of active RNA polymerase II transcription. A peptide corresponding to the nucleosome-binding domain of HMGN2 displaces HMGN2 from chromatin and arrests RNA polymerase II transcription in permeabilized cells. Upon transcriptional inhibition (by alpha-amanitin or actinomycin D), HMGN2 is released from chromatin and redistributes to interchromatin granule clusters (with splicing factor SC35), demonstrating dynamic, transcription-dependent association of HMGN2 with chromatin.","method":"Immunofluorescence and confocal microscopy in tissue culture cells; peptide displacement experiment in permeabilized cells; transcriptional inhibition with alpha-amanitin and actinomycin D","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization with functional consequence (peptide displaces HMGN2 and arrests transcription), pharmacological perturbation, multiple orthogonal approaches","pmids":["9843505"],"is_preprint":false},{"year":1987,"finding":"HMGN2 (HMG17) is distributed exclusively downstream from the transcription start point in actively transcribed chromatin. Monoclonal antibody-based immunofractionation of oligonucleosomes from transcriptionally active chicken liver and oviduct chromatin showed that HMG17 is absent from upstream regulatory regions and present only in the coding regions of the vitellogenin II, lysozyme, and ovalbumin genes.","method":"Monoclonal antibody-based immunoisolation of HMG17-containing oligonucleosomes; hybridization with gene-specific probes to determine position relative to transcription start","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct immunofractionation experiment with two independent experimental approaches, multiple gene targets, replicated in two tissues","pmids":["3665881"],"is_preprint":false},{"year":1997,"finding":"HMGN2 (HMG-17)-containing nucleosomes are organized in clusters along the chromatin fiber, with an average cluster size of ~6 contiguous HMG-17-containing nucleosomes. HMG-14 and HMG-17 segregate into distinct, non-overlapping nuclear domains. Immunofractionation shows that HMG-17-containing oligonucleosomes are devoid of HMG-14. Each nucleosome in the cluster contains either two or zero molecules of HMG-17.","method":"Confocal immunofluorescence microscopy, immunofractionation of defined-length oligonucleosomes with affinity-purified antibodies, quantitative analysis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal immunofractionation with quantitative analysis, confocal microscopy, orthogonal biochemical and imaging approaches","pmids":["9417927"],"is_preprint":false},{"year":2007,"finding":"HMGN2 (HMG-17) acts as a molecular switch regulating homeodomain (HD) transcription factor activity. HMGN2 forms a high-affinity complex with PITX2 homeodomain protein and inhibits PITX2 DNA-binding activity. Beta-catenin (activated by Wnt signaling) forms a ternary complex with PITX2/HMGN2, converting the repressor complex to an activator complex. Without beta-catenin, HMGN2 physically removes PITX2 from DNA to inhibit transcription. Homozygous Hmgn2 knockout mice show early embryonic lethality.","method":"Co-immunoprecipitation, DNA-binding assays, luciferase reporter transcription assays, chromatin studies; Hmgn2 knockout mouse generation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional transcription assays in a single lab study, supported by in vivo knockout phenotype, but abstract does not specify full mechanistic reconstitution","pmids":["18045789"],"is_preprint":false},{"year":2011,"finding":"HMGN2 inducibly binds a novel transactivation domain within the nuclear prolactin receptor (PRLr). This binding is activated by ligand-induced phosphorylation of the PRLr transactivation domain. The PRLr/HMGN2 association enables Stat5a-responsive promoter binding and facilitates transcriptional activation, promoting anchorage-independent growth.","method":"Co-immunoprecipitation of nuclear PRLr with HMGN2, identification of novel transactivation domain, phosphorylation-dependent binding assay, chromatin immunoprecipitation, transcriptional reporter assays","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, functional transcription assays, single lab, multiple orthogonal methods","pmids":["21816901"],"is_preprint":false},{"year":2016,"finding":"HDAC6 deacetylates HMGN2 at lysine K2, and this deacetylation promotes Stat5a-mediated transcription and breast cancer growth. HDAC6 inhibition increases HMGN2 K2 acetylation and concomitantly reduces Stat5a-mediated signaling. HMGN2 is highly acetylated at K2 in normal breast tissue but deacetylated in primary breast tumors and lymph node metastases.","method":"In vitro and in vivo HDAC6 inhibition experiments; measurement of HMGN2 K2 acetylation levels; Stat5a transcriptional activity assays; breast cancer growth assays","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional inhibitor studies in vitro and in vivo, acetylation site identified, multiple cellular and in vivo readouts, single lab","pmids":["27358110"],"is_preprint":false},{"year":2016,"finding":"HMGN2 specifically promotes STAT5 accessibility at promoter DNA by facilitating dissociation of the linker histone H1 in response to prolactin (PRL) signaling. Knockdown of H1 rescues the decrease in PRL-induced transcription following HMGN2 knockdown, demonstrating that HMGN2 acts upstream of H1 dissociation to allow STAT5 binding. H1 and STAT5 function antagonistically in regulating PRL-induced transcription and breast cancer cell biology.","method":"HMGN2 knockdown, H1 knockdown, STAT5 ChIP assays, PRL-induced gene transcription assays, cell proliferation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (HMGN2 KD rescued by H1 KD), ChIP, functional transcription assays, single lab","pmids":["28035005"],"is_preprint":false},{"year":2014,"finding":"HMGN2 is SUMOylated by the E3 ligase PIAS1 at lysine residues K17 and K35 within the nucleosome-binding domain in response to pro-inflammatory signals. SENP1 can deSUMOylate HMGN2. SUMOylated HMGN2 (SUMO1-conjugated, purified from a basal SUMOylation system in E. coli) shows significantly decreased binding affinity to nucleosome core particles compared to unSUMOylated HMGN2.","method":"In vitro SUMOylation assay, site-directed mutagenesis of K17 and K35, identification of PIAS1 as E3 ligase and SENP1 as deSUMOylase, nucleosome binding affinity assay with SUMO1-conjugated HMGN2 purified from E. coli","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of SUMOylation, site-specific mutagenesis, identification of E3 ligase and eraser, purified SUMOylated protein nucleosome binding assay — multiple orthogonal methods in single study","pmids":["24872413"],"is_preprint":false},{"year":2009,"finding":"HMGN2 is a component of the global genome repair subpathway of nucleotide excision repair. DT40 cells lacking HMGN2 (or HMGN1a+HMGN2) are hypersensitive to UV irradiation, show increased UV-induced G2-M checkpoint arrest and apoptosis, and display slower removal of UV-induced DNA lesions from native chromatin. Nucleotide excision repair itself (measured by host cell reactivation) remains intact, indicating that HMGN2 facilitates access of repair proteins to chromatin rather than the repair chemistry itself.","method":"Gene knockout in DT40 chicken cells, UV survival assay, G2-M checkpoint assay, apoptosis assay, UV-induced lesion removal assay from native chromatin, host cell reactivation assay for NER","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout, multiple orthogonal readouts (survival, checkpoint, lesion removal, host cell reactivation), clear mechanistic pathway placement","pmids":["19843163"],"is_preprint":false},{"year":2011,"finding":"HMGN2 modulates LPS-induced HBD-2 (beta-defensin-2) expression in A549 epithelial cells by prolonging nuclear NF-κB p65 retention, enhancing p65 acetylation through increased histone acetyltransferase activity, and promoting p65-Ser536 phosphorylation. HMGN2 and p65 synergistically bind the HBD-2 promoter as shown by ChIP assay.","method":"HMGN2 knockdown/overexpression, NF-κB p65 nuclear localization assay, histone acetyltransferase activity assay, phosphorylation analysis, chromatin immunoprecipitation (ChIP) of HMGN2 and p65 at HBD-2 promoter","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, multiple biochemical assays for NF-κB pathway regulation, single lab","pmids":["21518253"],"is_preprint":false},{"year":2021,"finding":"Lysine succinylation (Ksucc) at K30 within the HMGN2 nucleosome-binding domain (NBD) reduces HMGN2 binding to mononucleosomes and increases nucleosomal DNA accessibility by promoting DNA unwrapping in the entry/exit region. A succinyl lysine analogue (Kcsucc) was site-specifically installed at K30 using amber suppression to generate defined succinylated HMGN2.","method":"Site-specific installation of succinyl lysine analogue via amber suppression, mononucleosome binding assay, nucleosomal DNA accessibility/unwrapping assay","journal":"RSC chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — chemical biology reconstitution with site-specific modification mimic, direct in vitro binding and DNA accessibility assays","pmids":["34458839"],"is_preprint":false},{"year":2013,"finding":"Both HMGN1 and HMGN2 increase the winding angle of nucleosomal DNA as measured by circular dichroism spectroscopy using reconstituted nucleosomes, but the magnitude of structural changes induced by HMGN1 and HMGN2 differs significantly, suggesting they have different abilities to facilitate nucleosome remodeling.","method":"Circular dichroism (CD) spectroscopy of nucleosomes reconstituted from recombinant unmodified histones and synthetic DNA, binding with HMGN1 and HMGN2","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro structural assay with reconstituted nucleosomes, single method, single lab","pmids":["23772392"],"is_preprint":false},{"year":2022,"finding":"HMGN2 interacts with the transcription factor Lef-1 through its HMG-box domain (and also with Dlx2, FoxJ1, and Pitx2), and this interaction inhibits Lef-1 DNA-binding activity as demonstrated by EMSA. HMGN2 associates with H4K5ac and H3K4me2 chromatin marks at the Dlx2 promoter. MiR-23a and miR-23b directly target Hmgn2 mRNA, and ablation of Hmgn2 in mice results in increased amelogenin expression due to increased Pitx2, Dlx2, Lef-1, and FoxJ1 transcriptional activity.","method":"Bimolecular fluorescence complementation (BiFC), pull-down, co-immunoprecipitation, EMSA, ChIP for histone marks, miRNA target validation, Hmgn2 knockout mouse","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal binding assays (BiFC, pulldown, Co-IP), EMSA for functional inhibition, ChIP, in vivo knockout phenotype, miRNA validation","pmids":["35872015"],"is_preprint":false},{"year":1983,"finding":"HMG17 greatly facilitates the catenation of double-stranded DNA rings by DNA topoisomerases (type I and type II). Even at low DNA concentrations where catenanes are not otherwise formed, HMG17 promotes catenation of >95% of input DNA into large networks. This is demonstrated by gel electrophoresis and electron microscopy.","method":"In vitro DNA catenation assay with DNA topoisomerases I and II, gel electrophoresis, electron microscopy, restriction enzyme cleavage","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted enzymatic assay, multiple topoisomerases tested, structural validation by EM, single lab study","pmids":["6326673"],"is_preprint":false},{"year":1981,"finding":"HMGN2 (HMG-17) and HMG-14 bind preferentially to single-stranded DNA compared to double-stranded DNA, as demonstrated by sequential chromatography on immobilized ss- and dsDNA columns.","method":"Sequential affinity chromatography on immobilized ssDNA and dsDNA columns with purified HMG-17 protein","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro binding assay with purified protein, single method, single lab","pmids":["7279673"],"is_preprint":false},{"year":2019,"finding":"Loss of HMGN2 in pluripotent embryonal carcinoma cells leads to a global reduction in H3K9 acetylation and disrupts the H3K4me3, H3K9ac, H3K27ac, and H3K122ac profile at the Nanog and Oct4 loci. At endodermal/mesodermal genes, Hmgn2-knockout cells show a switch from bivalent to repressive chromatin configuration. Loss of HMGN2 leads to increased spontaneous neuronal differentiation and loss of pluripotency markers.","method":"Hmgn2 knockout in embryonal carcinoma cells, ChIP for multiple histone marks at specific loci, gene expression analysis, differentiation marker profiling","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout with ChIP for multiple histone marks at specific loci, functional differentiation phenotype, single lab","pmids":["31831052"],"is_preprint":false},{"year":2002,"finding":"An N-terminal fragment of HMGN2 (F3, residues corresponding to a 31 amino acid peptide) homes to tumor vasculature and tumor cell nuclei in vivo after intravenous injection. Fluorescein-labeled F3 peptide is internalized by tumor cells, appearing first in cytoplasm then in nuclei of tumor endothelial cells and tumor cells.","method":"Phage-displayed cDNA library screening with in vivo tumor homing selection, fluorescein-labeled peptide internalization in tumor cell lines and in vivo xenograft models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro and in vivo localization/internalization experiment with functional payload delivery, single lab","pmids":["12032302"],"is_preprint":false},{"year":2025,"finding":"HMGN1 and HMGN2 preferentially bind nucleosomes containing acetylated H3 tail residues and nucleosomes with the histone variant H2A.Z. Binding of HMGN1 and HMGN2 to nucleosomes reduces p300-mediated acetylation of H3K18, H3K23, and H3K27 in vitro. Loss of both HMGN1 and HMGN2 in mouse embryonic stem cells leads to increased steady-state levels of H3K27me2 and H3K27me3, but not H3 tail acetylation, and downregulation of ~1000 genes including cell identity genes.","method":"mESC knockout of Hmgn1 and/or Hmgn2 using gene engineering, nucleosome binding assays with modified/variant nucleosomes, in vitro p300 acetylation assays, epiproteomic mass spectrometry for histone modifications, RNA-seq for gene expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro nucleosome binding assay with defined modified/variant substrates, in vitro acetyltransferase assay with p300, epiproteomic MS, clean knockout in mESCs — multiple orthogonal rigorous methods","pmids":["41325801"],"is_preprint":false},{"year":2024,"finding":"HMGN2 binds to histones at the CDC20 promoter and promotes the stability of H3K27ac acetylation in the CDC20 promoter region, thereby enhancing CDC20 transcriptional activity and increasing glioma cell proliferation. ChIP assay confirmed HMGN2 occupancy at the CDC20 promoter.","method":"ChIP assay for HMGN2 and H3K27ac at CDC20 promoter, HMGN2 knockdown and overexpression, CDC20 transcription reporter, cell proliferation assays","journal":"Genes & diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP for HMGN2 and histone mark at specific locus, functional gene expression and proliferation readout, single lab","pmids":["40092489"],"is_preprint":false},{"year":2005,"finding":"The alpha-helical domain of HMGN2 (residues 18-48) is necessary and sufficient for its antimicrobial activity. Synthetic peptides corresponding to this domain had the same minimal inhibitory concentrations against E. coli, P. aeruginosa, and C. albicans as the full-length protein. N-terminal and C-terminal fragments lacking this domain had no antimicrobial activity.","method":"Structure prediction, synthesis of HMGN2 domain peptides, antimicrobial assays (MIC, MEC, MBC) with purified recombinant and synthetic peptides","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro antimicrobial reconstitution with domain deletion/fragment analysis, direct functional assay, single lab","pmids":["16115376"],"is_preprint":false},{"year":2017,"finding":"HMGN2 facilitates nuclear translocation of the transcription factor Nrf2 upon pyocyanin (PCN) stimulation in A549 lung epithelial cells, thereby elevating antioxidant gene expression and reducing intracellular ROS. HMGN2 also regulates actin cytoskeleton rearrangement in both PCN-dependent and independent manners, and specifically attenuates PCN-mediated Pseudomonas aeruginosa internalization via ROS elimination.","method":"HMGN2 knockdown/overexpression in A549 cells, Nrf2 nuclear localization assay, ROS measurement, actin cytoskeleton imaging, PA internalization assay","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional HMGN2 KD/OE with mechanistic readouts (Nrf2 localization, ROS, actin), multiple orthogonal assays, single lab","pmids":["28408162"],"is_preprint":false},{"year":2019,"finding":"HMGN2 deficiency in macrophages promotes M1 polarization and enhances NF-κB and MAPK signaling in response to non-tuberculous mycobacteria (NTM) infection, resulting in enhanced NO production and reduced NTM survival within macrophages. HMGN2 knockdown thus enhances the antimycobacterial innate immune response.","method":"HMGN2 siRNA knockdown in macrophages, NTM infection assay, M1/M2 polarization marker measurement, NF-κB and MAPK signaling analysis, NO production assay, intracellular NTM survival assay","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional KD with multiple signaling pathway readouts and functional bactericidal assay, single lab","pmids":["31596045"],"is_preprint":false},{"year":2025,"finding":"HMGN2 SUMOylation (mediated by PIAS1) enhances HMGN2 interaction with the transcription factor PAX5, thereby inhibiting PAX5 activity and driving macrophage polarization toward pro-inflammatory M1 phenotype. PIAS1 knockdown reduces HMGN2 SUMOylation, suppresses HMGN2-PAX5 binding, reduces inflammatory cytokine release, and reduces atherosclerotic plaque formation in ApoE-/- mice.","method":"PIAS1 knockdown, HMGN2 SUMOylation measurement, Co-IP of HMGN2 and PAX5, macrophage polarization assay, NF-κB signaling analysis, ELISA for cytokines, in vivo ApoE-/- atherosclerosis model","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of HMGN2-PAX5, SUMOylation modulation, multiple functional readouts in vitro and in vivo, single lab","pmids":["40834970"],"is_preprint":false},{"year":2020,"finding":"Knockout or knockdown of human HMGN1 alone or in combination with HMGN2 does not render human cells sensitive to UV light or transcription-blocking DNA lesions, does not impair transcription restart after UV, and GFP-HMGN1 is not recruited to UV-induced DNA damage sites nor to the TCR complex. This indicates that human HMGN1 and HMGN2 are NOT required for transcription-coupled DNA repair (negative finding).","method":"HMGN1/HMGN2 knockout and knockdown in human cells, UV and Illudin S sensitivity assays, transcription restart assay, GFP-HMGN1 recruitment to UV damage sites, Co-IP with TCR complex components","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean human cell KO/KD, multiple orthogonal assays including recruitment imaging and Co-IP, replicated across HMGN1 and HMGN2, explicitly negative result","pmids":["32152397"],"is_preprint":false}],"current_model":"HMGN2 (formerly HMG-17) is a nucleosome-binding non-histone chromosomal protein that binds preferentially to nucleosome core particles (two molecules per nucleosome, via a defined nucleosome-binding domain requiring histone tails) at sites flanking the dyad axis, clusters in discrete nuclear domains downstream of active transcription start sites, and functions as a chromatin-specific coactivator that unfolds higher-order chromatin structure to enhance transcription initiation efficiency and DNA replication from chromatin templates; its activity and chromatin affinity are regulated by post-translational modifications including PCAF-mediated acetylation at K2 (reducing nucleosome binding), HDAC6-mediated deacetylation (which promotes Stat5a/PRLr-mediated transcription), PIAS1-mediated SUMOylation at K17/K35 (reducing nucleosome binding and regulating PAX5 interactions), and succinylation at K30 (reducing chromatin recruitment); it is actively imported into the nucleus via importin alpha after mitotic release from chromatin; it acts as a molecular switch in Wnt/beta-catenin signaling by inhibiting homeodomain transcription factor DNA-binding activity, a repression reversed by beta-catenin; and it participates in global genome nucleotide excision repair by facilitating repair protein access to chromatin."},"narrative":{"mechanistic_narrative":"HMGN2 (formerly HMG-17) is a nucleosome-binding non-histone chromosomal protein that modulates higher-order chromatin structure to regulate transcription, replication, and DNA repair [PMID:7649479, PMID:8107104]. It binds nucleosome core particles through a discrete 30-residue nucleosome-binding domain that functions as an independent module, requiring the histone tails for binding and occupying defined sites flanking the dyad axis, with two molecules per nucleosome that overlap the linker-histone H1/H5 footprint [PMID:8107104, PMID:1453455]. HMGN2-containing nucleosomes are organized in clusters of ~6 contiguous particles segregated into nuclear domains distinct from the related HMG-14, and localize downstream of active transcription start sites at sites of RNA polymerase II activity [PMID:3665881, PMID:9417927, PMID:9843505]. Functionally, HMGN2 acts as a chromatin-specific coactivator: incorporated into chromatin during assembly, it unfolds chromatin to enhance activator-dependent transcription initiation and to stimulate replication, effects seen only with chromatin and not naked DNA templates [PMID:7649479, PMID:9545265, PMID:8404854]. Mechanistically it counteracts the linker histone, facilitating dissociation of H1 to grant transcription-factor access, and shapes histone modification landscapes by binding acetylated and H2A.Z-containing nucleosomes and restraining p300-mediated H3 acetylation [PMID:28035005, PMID:41325801]. HMGN2 chromatin affinity is tuned by post-translational modifications mapping to its N-terminus and binding domain: PCAF acetylation at K2 reduces nucleosome binding while HDAC6-mediated K2 deacetylation promotes Stat5a-driven transcription; PIAS1-mediated SUMOylation at K17/K35 and succinylation at K30 both reduce nucleosome binding and increase DNA accessibility [PMID:10207070, PMID:27358110, PMID:24872413, PMID:34458839]. Beyond chromatin, HMGN2 binds homeodomain and HMG-box transcription factors including PITX2 and Lef-1 and inhibits their DNA binding, acting as a Wnt/beta-catenin-reversible repressive switch, and it contributes to global-genome nucleotide excision repair by facilitating repair-protein access to lesions in chromatin [PMID:18045789, PMID:35872015, PMID:19843163]. Hmgn2 loss causes embryonic lethality and perturbs the histone-modification state and pluripotency program of stem cells [PMID:18045789, PMID:31831052, PMID:41325801].","teleology":[{"year":1981,"claim":"Established the basic nucleic-acid binding preference of HMGN2, framing it as a chromatin-associated protein with single-stranded DNA affinity.","evidence":"Sequential affinity chromatography of purified protein on immobilized ss- and dsDNA columns","pmids":["7279673"],"confidence":"Medium","gaps":["Does not define the physiological binding substrate (nucleosome vs. free DNA)","Single method, no structural mapping"]},{"year":1983,"claim":"Showed HMGN2 can influence DNA topology by facilitating topoisomerase-mediated catenation, hinting at an architectural role on DNA.","evidence":"In vitro catenation assays with topoisomerases I and II, gel electrophoresis and electron microscopy","pmids":["6326673"],"confidence":"Medium","gaps":["Biological relevance to chromatin in cells unclear","Mechanism of catenation enhancement not defined"]},{"year":1987,"claim":"Answered where HMGN2 acts within genes, placing it specifically in coding regions downstream of transcription start sites rather than upstream regulatory elements.","evidence":"Monoclonal antibody immunoisolation of oligonucleosomes with gene-specific hybridization in chicken liver and oviduct","pmids":["3665881"],"confidence":"High","gaps":["Does not establish causality between localization and transcription","Limited to three genes"]},{"year":1992,"claim":"Defined the modular nucleosome-binding domain of HMGN2 and showed binding requires the histone tails, establishing the structural basis of nucleosome recognition.","evidence":"EMSA, thermal denaturation, DNase I footprinting with synthetic peptides and trypsin-stripped nucleosomes","pmids":["1453455"],"confidence":"High","gaps":["No atomic structure of the domain-nucleosome interface","Functional consequence in cells addressed separately"]},{"year":1993,"claim":"Demonstrated that HMGN2 incorporated during chromatin assembly stabilizes nucleosome structure and increases transcriptional potential, linking assembly-coupled deposition to function.","evidence":"Xenopus egg extract replication/assembly system with in vitro transcription and nucleosomal ladder analysis","pmids":["8404854"],"confidence":"High","gaps":["Timing requirement mechanism not resolved","Does not identify transcription machinery contacted"]},{"year":1995,"claim":"Established HMGN2 as a chromatin-specific transcriptional coactivator acting at initiation, defining its core mechanistic role.","evidence":"Reconstituted nucleosomal-array in vitro transcription with GAL4-VP16, chromatin vs. naked DNA controls","pmids":["7649479"],"confidence":"High","gaps":["Does not identify the molecular target unfolded","Activator-dependence mechanism not detailed"]},{"year":1994,"claim":"Mapped the precise nucleosomal contacts of HMGN2 and showed two molecules bind per core near the dyad, overlapping the linker-histone site — predicting antagonism with H1.","evidence":"Hydroxyl radical footprinting on nucleosome cores and chromatosomes","pmids":["8107104"],"confidence":"High","gaps":["Functional H1 antagonism shown only later","No information on higher-order fiber arrangement"]},{"year":1997,"claim":"Revealed HMGN2 occupies clustered, contiguous nucleosomes in discrete nuclear domains distinct from HMG-14, indicating non-random genomic and spatial organization.","evidence":"Confocal immunofluorescence and reciprocal immunofractionation of defined oligonucleosomes","pmids":["9417927"],"confidence":"High","gaps":["Determinants of cluster targeting unknown","Functional meaning of HMGN segregation unclear"]},{"year":1998,"claim":"Connected HMGN2 chromatin association to ongoing transcription and to cell-cycle-regulated nuclear import, establishing it as a dynamic, importin-alpha-dependent chromatin factor.","evidence":"Immunofluorescence across cell cycle, peptide displacement in permeabilized cells, transcription inhibition, importin-alpha-dependent reconstituted nuclear import assays","pmids":["9843505","9852141"],"confidence":"High","gaps":["Does not define how transcription state controls chromatin retention","Import signal characterized but upstream regulation unknown"]},{"year":1998,"claim":"Extended the coactivator role to DNA replication, showing assembly-coupled HMGN2 incorporation enhances replication of chromatin templates.","evidence":"In vitro SV40 minichromosome replication assay with chromatin vs. naked DNA and timing controls","pmids":["9545265"],"confidence":"High","gaps":["Replication machinery contacts not identified","In vivo replication role untested"]},{"year":1999,"claim":"Identified PCAF acetylation of HMGN2 at K2 as a regulatory modification that lowers nucleosome affinity, providing the first PTM-based control of chromatin binding and ordering it before histone acetylation.","evidence":"In vitro PCAF acetyltransferase assay, mass-spec site mapping, equilibrium dialysis binding, deletion mutants","pmids":["10207070"],"confidence":"High","gaps":["In vivo acetylation dynamics not fully resolved","Functional consequence for transcription shown later"]},{"year":2002,"claim":"Showed an N-terminal HMGN2 fragment functions as a tumor-homing, cell-penetrating peptide, revealing an unexpected extracellular/delivery property.","evidence":"In vivo phage-display tumor homing selection and fluorescent peptide internalization in xenografts","pmids":["12032302"],"confidence":"Medium","gaps":["Relationship to nuclear chromatin function unclear","Receptor/uptake mechanism unknown"]},{"year":2005,"claim":"Demonstrated a distinct antimicrobial function residing in the HMGN2 alpha-helical domain, separable from chromatin binding.","evidence":"Domain peptide synthesis and antimicrobial MIC/MEC/MBC assays against bacteria and fungi","pmids":["16115376"],"confidence":"Medium","gaps":["Mechanism of microbial killing not defined","In vivo relevance of secreted/extracellular HMGN2 unclear"]},{"year":2007,"claim":"Established HMGN2 as a beta-catenin-reversible molecular switch controlling homeodomain transcription factor DNA binding, broadening its role to Wnt-pathway signaling.","evidence":"Co-IP, DNA-binding and luciferase assays with PITX2 and beta-catenin; Hmgn2 knockout mouse (embryonic lethal)","pmids":["18045789"],"confidence":"Medium","gaps":["Full reconstitution of ternary switch not shown","Causal link of lethality to PITX2 axis untested"]},{"year":2009,"claim":"Placed HMGN2 in the global-genome nucleotide excision repair subpathway, acting by facilitating repair-protein access to chromatin rather than the repair chemistry.","evidence":"DT40 chicken knockouts, UV survival, G2-M checkpoint, lesion-removal and host-cell reactivation assays","pmids":["19843163"],"confidence":"High","gaps":["Species-specific (later contradicted in human cells)","Repair factors recruited not identified"]},{"year":2011,"claim":"Linked HMGN2 to receptor signaling, showing phosphorylation-dependent binding to nuclear PRLr enables Stat5a-responsive transcription and growth.","evidence":"Co-IP of nuclear PRLr with HMGN2, ChIP, transcriptional reporter assays","pmids":["21816901"],"confidence":"Medium","gaps":["Single lab, no reciprocal structural validation","Generality across Stat5 targets unclear"]},{"year":2011,"claim":"Showed HMGN2 amplifies NF-kB-driven beta-defensin induction by prolonging p65 nuclear retention and modification, connecting it to innate immune transcription.","evidence":"HMGN2 knockdown/overexpression, p65 localization, HAT activity, phosphorylation, ChIP at HBD-2 promoter","pmids":["21518253"],"confidence":"Medium","gaps":["Direct vs. indirect effect on p65 not resolved","Single cell-line system"]},{"year":2013,"claim":"Provided structural evidence that HMGN2 alters nucleosomal DNA winding, with quantitatively different effects from HMGN1, indicating paralog-specific remodeling capacity.","evidence":"Circular dichroism spectroscopy of reconstituted nucleosomes with recombinant HMGN1/HMGN2","pmids":["23772392"],"confidence":"Medium","gaps":["Functional consequence of winding change not tested","Single biophysical method"]},{"year":2014,"claim":"Identified PIAS1-mediated SUMOylation at K17/K35 within the binding domain as a signal-responsive PTM that lowers nucleosome affinity, with SENP1 as the eraser.","evidence":"In vitro SUMOylation, site mutagenesis, E3/deSUMOylase identification, nucleosome binding with purified SUMOylated protein","pmids":["24872413"],"confidence":"High","gaps":["In vivo SUMOylation stoichiometry unclear","Downstream transcriptional effect characterized later"]},{"year":2016,"claim":"Connected the K2 acetylation switch to disease, showing HDAC6 deacetylation of HMGN2 promotes Stat5a transcription and breast cancer growth.","evidence":"HDAC6 inhibition in vitro and in vivo, K2 acetylation measurement, Stat5a activity and tumor growth assays, patient tissue analysis","pmids":["27358110"],"confidence":"Medium","gaps":["Direct HDAC6-HMGN2 enzyme-substrate kinetics not shown","Other HDAC6 substrates may contribute"]},{"year":2016,"claim":"Resolved the mechanism of HMGN2 coactivation in PRL signaling: it promotes STAT5 access by facilitating linker-histone H1 dissociation, fulfilling the prediction from its dyad-overlapping footprint.","evidence":"HMGN2 and H1 knockdown epistasis, STAT5 ChIP, PRL-induced transcription and proliferation assays","pmids":["28035005"],"confidence":"Medium","gaps":["Direct competition with H1 on nucleosomes not biochemically reconstituted","Genome-wide scope untested"]},{"year":2019,"claim":"Demonstrated HMGN2 maintains the histone-modification landscape and pluripotency program of stem cells, with loss shifting bivalent to repressive chromatin and triggering differentiation.","evidence":"Hmgn2 knockout embryonal carcinoma cells, ChIP for multiple histone marks at pluripotency/lineage loci, differentiation profiling","pmids":["31831052"],"confidence":"Medium","gaps":["Mechanism linking HMGN2 to specific mark changes unclear","Single cell model"]},{"year":2019,"claim":"Extended HMGN2 to macrophage immune regulation, where its deficiency promotes M1 polarization and antimycobacterial responses via NF-kB/MAPK signaling.","evidence":"siRNA knockdown in macrophages, NTM infection, polarization markers, signaling and NO assays","pmids":["31596045"],"confidence":"Medium","gaps":["Chromatin-based vs. signaling mechanism not separated","Direct gene targets not defined"]},{"year":2020,"claim":"Established that, in human cells, HMGN1/HMGN2 are NOT required for transcription-coupled repair, refining the repair role to global-genome NER and revealing species or pathway specificity.","evidence":"Human cell KO/KD, UV and Illudin S sensitivity, transcription restart, GFP-HMGN1 recruitment imaging, TCR complex Co-IP (negative result)","pmids":["32152397"],"confidence":"High","gaps":["Does not test global-genome NER in human cells directly","Reconciliation with DT40 GG-NER finding incomplete"]},{"year":2021,"claim":"Added succinylation at K30 to the PTM repertoire, showing this modification reduces nucleosome binding and increases DNA accessibility via entry/exit unwrapping.","evidence":"Amber-suppression installation of succinyl-lysine analogue, mononucleosome binding and DNA accessibility assays","pmids":["34458839"],"confidence":"High","gaps":["Cellular enzymes adding/removing K30 succinyl unknown","Transcriptional consequence not tested"]},{"year":2022,"claim":"Generalized the transcription-factor inhibitory switch beyond PITX2, showing HMG-box-mediated binding to Lef-1, Dlx2 and FoxJ1 inhibits their DNA binding and that miR-23a/b regulate Hmgn2 to control amelogenin expression in vivo.","evidence":"BiFC, pull-down, Co-IP, EMSA, histone-mark ChIP, miRNA target validation, Hmgn2 knockout mouse","pmids":["35872015"],"confidence":"High","gaps":["Structural basis of HMG-box-TF interaction not resolved","Switch reversibility for these factors not shown"]},{"year":2024,"claim":"Showed locus-specific coactivation in cancer, with HMGN2 stabilizing H3K27ac at the CDC20 promoter to enhance transcription and glioma proliferation.","evidence":"ChIP for HMGN2 and H3K27ac at CDC20 promoter, knockdown/overexpression, reporter and proliferation assays","pmids":["40092489"],"confidence":"Medium","gaps":["How HMGN2 stabilizes the mark mechanistically unclear","Single tumor type"]},{"year":2025,"claim":"Linked HMGN2 SUMOylation to inflammatory disease, showing PIAS1-driven SUMOylation enhances HMGN2-PAX5 binding to inhibit PAX5, drive M1 polarization, and promote atherosclerosis.","evidence":"PIAS1 knockdown, SUMOylation measurement, HMGN2-PAX5 Co-IP, polarization and cytokine assays, ApoE-/- atherosclerosis model","pmids":["40834970"],"confidence":"Medium","gaps":["Direct SUMO-dependent structural basis of PAX5 binding not shown","In vivo causality is correlative"]},{"year":2025,"claim":"Refined the chromatin-shaping mechanism, showing HMGN1/2 prefer acetylated and H2A.Z nucleosomes, restrain p300 acetylation, and protect against H3K27 methylation to maintain cell-identity gene expression.","evidence":"mESC Hmgn1/2 knockouts, modified/variant nucleosome binding, in vitro p300 assays, epiproteomic MS, RNA-seq","pmids":["41325801"],"confidence":"High","gaps":["Mechanism linking HMGN binding to H3K27me protection not defined","Direct PRC2 antagonism untested"]},{"year":null,"claim":"How HMGN2's diverse activities — nucleosome-affinity tuning by PTMs, linker-histone antagonism, transcription-factor sequestration, and histone-modification shaping — are integrated and selectively deployed across cell types remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of HMGN2 on the nucleosome","Genome-wide rules for cluster targeting and TF-switch deployment unknown","Reconciliation of pro- and anti-tumor / pro- and anti-inflammatory roles across contexts"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,10,19,11]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[2,3,24]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[21,20]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,13,19,24]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[13,11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,7,9]},{"term_id":"GO:0000228","term_label":"nuclear 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uterine leiomyomas with ring chromosome 1.","date":"1999","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/9973936","citation_count":10,"is_preprint":false},{"pmid":"23772392","id":"PMC_23772392","title":"Nucleosome structural changes induced by binding of non-histone chromosomal proteins HMGN1 and HMGN2.","date":"2013","source":"FEBS open bio","url":"https://pubmed.ncbi.nlm.nih.gov/23772392","citation_count":10,"is_preprint":false},{"pmid":"35872015","id":"PMC_35872015","title":"HMGN2 represses gene transcription via interaction with transcription factors Lef-1 and Pitx2 during amelogenesis.","date":"2022","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/35872015","citation_count":9,"is_preprint":false},{"pmid":"33589921","id":"PMC_33589921","title":"Prolactin Drives a Dynamic STAT5A/HDAC6/HMGN2 Cis-Regulatory Landscape Exploitable in ER+ Breast 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Relation with histone H1 defined epitopes.","date":"2002","source":"Journal of peptide science : an official publication of the European Peptide Society","url":"https://pubmed.ncbi.nlm.nih.gov/12523645","citation_count":3,"is_preprint":false},{"pmid":"41325801","id":"PMC_41325801","title":"HMGN1 and HMGN2 are recruited to acetylated and histone variant H2A.Z-containing nucleosomes to regulate chromatin state and transcription.","date":"2025","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/41325801","citation_count":1,"is_preprint":false},{"pmid":"2226652","id":"PMC_2226652","title":"Expression of human chromosomal proteins HMG-14 and HMG-17 in Saccharomyces cerevisiae.","date":"1990","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/2226652","citation_count":1,"is_preprint":false},{"pmid":"16156270","id":"PMC_16156270","title":"[E. coli-based production of recombinant HMG-17 and its antibacterial domain].","date":"2005","source":"Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/16156270","citation_count":1,"is_preprint":false},{"pmid":"8670211","id":"PMC_8670211","title":"Chromosomal proteins HMG-14 and HMG-17 are synthesized throughout the S-phase in Burkitt's lymphoma.","date":"1996","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/8670211","citation_count":1,"is_preprint":false},{"pmid":"40834970","id":"PMC_40834970","title":"Inhibition of HMGN2 SUMOylation ameliorates atherosclerosis by activating PAX5 expression to induce macrophage M2 polarization.","date":"2025","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/40834970","citation_count":0,"is_preprint":false},{"pmid":"39179658","id":"PMC_39179658","title":"An evolutionarily distinct Hmgn2 variant influences shape recognition in Medaka Fish.","date":"2024","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/39179658","citation_count":0,"is_preprint":false},{"pmid":"41246296","id":"PMC_41246296","title":"Deficiency of HMGN2 enhances antibacterial activity of macrophages by promoting H3 histone modification-mediated CD14/iNOS expression.","date":"2025","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/41246296","citation_count":0,"is_preprint":false},{"pmid":"20842856","id":"PMC_20842856","title":"[Isolation and purification of antimicrobial polypeptide HMGN2 from human lymph node and analysis of its distribution].","date":"2010","source":"Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/20842856","citation_count":0,"is_preprint":false},{"pmid":"41574665","id":"PMC_41574665","title":"HMGN2 induces pyroptosis in tumour cells by modulating the STT3B/PD‑L1/caspase‑1/GSDMD axis.","date":"2026","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/41574665","citation_count":0,"is_preprint":false},{"pmid":"16078558","id":"PMC_16078558","title":"[Production of HMGN2 polyclonal antibody by immunization with recombinant GST-HMGN2 fusion protein and its application to analysis of HMGN2 distribution in human monocytes].","date":"2005","source":"Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/16078558","citation_count":0,"is_preprint":false},{"pmid":"39422077","id":"PMC_39422077","title":"[Corrigendum] Nucleosome‑binding protein HMGN2 exhibits antitumor activity in human SaO2 and U2‑OS osteosarcoma cell lines.","date":"2024","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/39422077","citation_count":0,"is_preprint":false},{"pmid":"28591948","id":"PMC_28591948","title":"[The Role of HMGN2 in the Development of Periodontitis Dental Plaque].","date":"2016","source":"Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/28591948","citation_count":0,"is_preprint":false},{"pmid":"42050655","id":"PMC_42050655","title":"HMGN2 deficiency drives DLBCL progression through impaired R-loop formation and PI3K-AKT hyperactivation.","date":"2026","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/42050655","citation_count":0,"is_preprint":false},{"pmid":"41700809","id":"PMC_41700809","title":"Antitumor effects of STING agonists on nervous system tumors via tumor-intrinsic STING-STAT1-mediated HMGN2 expression.","date":"2026","source":"Cancer biology & medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41700809","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45203,"output_tokens":9154,"usd":0.13646,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19045,"output_tokens":7773,"usd":0.144775,"stage2_stop_reason":"end_turn"},"total_usd":0.281235,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"PCAF acetyltransferase specifically acetylates HMGN2 (HMG-17) at lysine 2 (K2), but not the closely related HMG-14. This acetylation is confirmed as a predominant in vivo modification site. Acetylation of HMGN2 reduces its binding affinity to nucleosome core particles (measured by equilibrium dialysis). Conversely, binding of HMGN2 to nucleosome cores inhibits PCAF-mediated acetylation of histone H3, suggesting that HMGN2 acetylation precedes histone acetylation in transcriptionally active chromatin.\",\n      \"method\": \"In vitro acetyltransferase assay with PCAF, mass spectrometry sequence analysis to identify K2 acetylation site, equilibrium dialysis to measure nucleosome binding affinity, HMG-17 deletion mutants and competition studies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay with mutagenesis/deletion mutants, mass spectrometry site identification, equilibrium dialysis binding assay, and in vivo validation of the acetylation site, all in a single rigorous study\",\n      \"pmids\": [\"10207070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"HMGN2 (HMG17) functions as a chromatin-specific transcriptional coactivator that increases the efficiency of transcription initiation by RNA polymerase II. This effect requires incorporation of HMGN2 into chromatin (not naked DNA templates) during chromatin assembly and depends on the presence of a sequence-specific activator (GAL4-VP16). HMGN2 in chromatin produced 7- to 40-fold stimulation of activated transcription but had no effect on transcriptional elongation.\",\n      \"method\": \"In vitro transcription assay using reconstituted chromatin templates (regularly spaced nucleosomal arrays) with and without HMGN2, structural analysis of HMG17-containing chromatin, comparison of chromatin vs. non-nucleosomal templates\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted chromatin system with in vitro transcription assay, multiple controls (chromatin vs. naked DNA, presence/absence of activator), rigorous mechanistic dissection in a single focused study\",\n      \"pmids\": [\"7649479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Hydroxyl radical footprinting mapped the positions of HMGN2 (HMG-17) and HMG-14 on nucleosome cores and H1/H5-depleted chromatosomes. Both proteins occupy identical sites: protecting DNA ~25 bp from the end of nucleosomal DNA and in each of the two major grooves flanking the dyad axis. Two molecules of HMGN2 bind per nucleosome core, bridging two adjacent DNA strands on the surface of the particle. Binding sites near the dyad overlap with those of linker histones H1/H5.\",\n      \"method\": \"Hydroxyl radical footprinting of HMG-14 and HMG-17 bound to isolated nucleosome cores and chromatosomes\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct structural footprinting assay with quantitative mapping of protein-DNA contacts, rigorous reconstitution approach\",\n      \"pmids\": [\"8107104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The nucleosome-binding domain of HMGN2 (HMG-17), a 30 amino acid peptide, functions as an independent module. This peptide specifically shifts nucleosome core mobility, elevates the Tm of core particles, and protects the same DNase I cleavage sites as the intact protein. Binding of both the peptide and intact protein requires the histone tails (lost upon trypsin digestion). The nucleosomal binding sites of the peptide are identical to those of the intact protein, establishing the modular architecture of HMGN2.\",\n      \"method\": \"Mobility shift assay, thermal denaturation (Tm measurement), DNase I digestion protection assay with synthetic peptides corresponding to HMGN2 domains; trypsin digestion of histone tails\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal in vitro biochemical assays (EMSA, thermal denaturation, DNase I footprinting) with peptide dissection, all in a single rigorous study\",\n      \"pmids\": [\"1453455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HMGN2 (HMG-17) stimulates replication efficiency of a chromatin template. HMGN2 incorporated into SV40 minichromosomes during assembly induces extended chromatin structure and enhances the rate of replication in an in vitro SV40 replication system. The effect is chromatin-specific (not seen with protein-free DNA) and requires HMGN2 incorporation during, not after, chromatin assembly.\",\n      \"method\": \"In vitro SV40 replication assay using Xenopus egg extract-assembled minichromosomes with or without HMGN2; structural analysis of chromatin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with functional replication assay, chromatin vs. naked DNA controls, timing-of-incorporation control, single rigorous study\",\n      \"pmids\": [\"9545265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"HMGN2 (HMG-17) is incorporated into nascent chromatin during replication in Xenopus egg extracts, prior to completion of chromatin assembly. It stabilizes nucleosomal core structure, improves the periodicity of nucleosomal spacing in nascent chromatin, and significantly increases the transcriptional potential of assembled chromatin (5S RNA gene and satellite I chromatin). The increase in transcriptional potential is observed only when HMGN2 is incorporated during chromatin assembly, not after.\",\n      \"method\": \"Cell-free Xenopus egg extract replication system; in vitro transcription assays; nucleosomal ladder analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted cell-free system, in vitro transcription assay, timing-of-incorporation controls, multiple functional readouts\",\n      \"pmids\": [\"8404854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HMGN2 (HMG-17) is released from chromatin during mitosis (not present on metaphase/anaphase chromosomes) and actively reimported into the nucleus in late telophase concomitant with nuclear envelope formation. Import is energy-dependent, requires importin alpha, and is mediated by an intrinsic bipartite nuclear localization signal in HMGN2. Thus, the cell-cycle-regulated association of HMGN2 with chromatin is dependent on nuclear import processes.\",\n      \"method\": \"Immunofluorescence colocalization across cell cycle stages, reconstituted nuclei and permeabilized cell nuclear import assays, energy depletion and importin alpha inhibition experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments across cell cycle, functional nuclear import reconstitution with defined inhibition of importin alpha, replicated across HMG-14 and HMG-17\",\n      \"pmids\": [\"9852141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In transcriptionally active cells, HMGN2 (HMG-17) colocalizes with sites of active RNA polymerase II transcription. A peptide corresponding to the nucleosome-binding domain of HMGN2 displaces HMGN2 from chromatin and arrests RNA polymerase II transcription in permeabilized cells. Upon transcriptional inhibition (by alpha-amanitin or actinomycin D), HMGN2 is released from chromatin and redistributes to interchromatin granule clusters (with splicing factor SC35), demonstrating dynamic, transcription-dependent association of HMGN2 with chromatin.\",\n      \"method\": \"Immunofluorescence and confocal microscopy in tissue culture cells; peptide displacement experiment in permeabilized cells; transcriptional inhibition with alpha-amanitin and actinomycin D\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization with functional consequence (peptide displaces HMGN2 and arrests transcription), pharmacological perturbation, multiple orthogonal approaches\",\n      \"pmids\": [\"9843505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"HMGN2 (HMG17) is distributed exclusively downstream from the transcription start point in actively transcribed chromatin. Monoclonal antibody-based immunofractionation of oligonucleosomes from transcriptionally active chicken liver and oviduct chromatin showed that HMG17 is absent from upstream regulatory regions and present only in the coding regions of the vitellogenin II, lysozyme, and ovalbumin genes.\",\n      \"method\": \"Monoclonal antibody-based immunoisolation of HMG17-containing oligonucleosomes; hybridization with gene-specific probes to determine position relative to transcription start\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct immunofractionation experiment with two independent experimental approaches, multiple gene targets, replicated in two tissues\",\n      \"pmids\": [\"3665881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"HMGN2 (HMG-17)-containing nucleosomes are organized in clusters along the chromatin fiber, with an average cluster size of ~6 contiguous HMG-17-containing nucleosomes. HMG-14 and HMG-17 segregate into distinct, non-overlapping nuclear domains. Immunofractionation shows that HMG-17-containing oligonucleosomes are devoid of HMG-14. Each nucleosome in the cluster contains either two or zero molecules of HMG-17.\",\n      \"method\": \"Confocal immunofluorescence microscopy, immunofractionation of defined-length oligonucleosomes with affinity-purified antibodies, quantitative analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal immunofractionation with quantitative analysis, confocal microscopy, orthogonal biochemical and imaging approaches\",\n      \"pmids\": [\"9417927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HMGN2 (HMG-17) acts as a molecular switch regulating homeodomain (HD) transcription factor activity. HMGN2 forms a high-affinity complex with PITX2 homeodomain protein and inhibits PITX2 DNA-binding activity. Beta-catenin (activated by Wnt signaling) forms a ternary complex with PITX2/HMGN2, converting the repressor complex to an activator complex. Without beta-catenin, HMGN2 physically removes PITX2 from DNA to inhibit transcription. Homozygous Hmgn2 knockout mice show early embryonic lethality.\",\n      \"method\": \"Co-immunoprecipitation, DNA-binding assays, luciferase reporter transcription assays, chromatin studies; Hmgn2 knockout mouse generation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional transcription assays in a single lab study, supported by in vivo knockout phenotype, but abstract does not specify full mechanistic reconstitution\",\n      \"pmids\": [\"18045789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HMGN2 inducibly binds a novel transactivation domain within the nuclear prolactin receptor (PRLr). This binding is activated by ligand-induced phosphorylation of the PRLr transactivation domain. The PRLr/HMGN2 association enables Stat5a-responsive promoter binding and facilitates transcriptional activation, promoting anchorage-independent growth.\",\n      \"method\": \"Co-immunoprecipitation of nuclear PRLr with HMGN2, identification of novel transactivation domain, phosphorylation-dependent binding assay, chromatin immunoprecipitation, transcriptional reporter assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, functional transcription assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21816901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HDAC6 deacetylates HMGN2 at lysine K2, and this deacetylation promotes Stat5a-mediated transcription and breast cancer growth. HDAC6 inhibition increases HMGN2 K2 acetylation and concomitantly reduces Stat5a-mediated signaling. HMGN2 is highly acetylated at K2 in normal breast tissue but deacetylated in primary breast tumors and lymph node metastases.\",\n      \"method\": \"In vitro and in vivo HDAC6 inhibition experiments; measurement of HMGN2 K2 acetylation levels; Stat5a transcriptional activity assays; breast cancer growth assays\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional inhibitor studies in vitro and in vivo, acetylation site identified, multiple cellular and in vivo readouts, single lab\",\n      \"pmids\": [\"27358110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HMGN2 specifically promotes STAT5 accessibility at promoter DNA by facilitating dissociation of the linker histone H1 in response to prolactin (PRL) signaling. Knockdown of H1 rescues the decrease in PRL-induced transcription following HMGN2 knockdown, demonstrating that HMGN2 acts upstream of H1 dissociation to allow STAT5 binding. H1 and STAT5 function antagonistically in regulating PRL-induced transcription and breast cancer cell biology.\",\n      \"method\": \"HMGN2 knockdown, H1 knockdown, STAT5 ChIP assays, PRL-induced gene transcription assays, cell proliferation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (HMGN2 KD rescued by H1 KD), ChIP, functional transcription assays, single lab\",\n      \"pmids\": [\"28035005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HMGN2 is SUMOylated by the E3 ligase PIAS1 at lysine residues K17 and K35 within the nucleosome-binding domain in response to pro-inflammatory signals. SENP1 can deSUMOylate HMGN2. SUMOylated HMGN2 (SUMO1-conjugated, purified from a basal SUMOylation system in E. coli) shows significantly decreased binding affinity to nucleosome core particles compared to unSUMOylated HMGN2.\",\n      \"method\": \"In vitro SUMOylation assay, site-directed mutagenesis of K17 and K35, identification of PIAS1 as E3 ligase and SENP1 as deSUMOylase, nucleosome binding affinity assay with SUMO1-conjugated HMGN2 purified from E. coli\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of SUMOylation, site-specific mutagenesis, identification of E3 ligase and eraser, purified SUMOylated protein nucleosome binding assay — multiple orthogonal methods in single study\",\n      \"pmids\": [\"24872413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HMGN2 is a component of the global genome repair subpathway of nucleotide excision repair. DT40 cells lacking HMGN2 (or HMGN1a+HMGN2) are hypersensitive to UV irradiation, show increased UV-induced G2-M checkpoint arrest and apoptosis, and display slower removal of UV-induced DNA lesions from native chromatin. Nucleotide excision repair itself (measured by host cell reactivation) remains intact, indicating that HMGN2 facilitates access of repair proteins to chromatin rather than the repair chemistry itself.\",\n      \"method\": \"Gene knockout in DT40 chicken cells, UV survival assay, G2-M checkpoint assay, apoptosis assay, UV-induced lesion removal assay from native chromatin, host cell reactivation assay for NER\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout, multiple orthogonal readouts (survival, checkpoint, lesion removal, host cell reactivation), clear mechanistic pathway placement\",\n      \"pmids\": [\"19843163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HMGN2 modulates LPS-induced HBD-2 (beta-defensin-2) expression in A549 epithelial cells by prolonging nuclear NF-κB p65 retention, enhancing p65 acetylation through increased histone acetyltransferase activity, and promoting p65-Ser536 phosphorylation. HMGN2 and p65 synergistically bind the HBD-2 promoter as shown by ChIP assay.\",\n      \"method\": \"HMGN2 knockdown/overexpression, NF-κB p65 nuclear localization assay, histone acetyltransferase activity assay, phosphorylation analysis, chromatin immunoprecipitation (ChIP) of HMGN2 and p65 at HBD-2 promoter\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, multiple biochemical assays for NF-κB pathway regulation, single lab\",\n      \"pmids\": [\"21518253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Lysine succinylation (Ksucc) at K30 within the HMGN2 nucleosome-binding domain (NBD) reduces HMGN2 binding to mononucleosomes and increases nucleosomal DNA accessibility by promoting DNA unwrapping in the entry/exit region. A succinyl lysine analogue (Kcsucc) was site-specifically installed at K30 using amber suppression to generate defined succinylated HMGN2.\",\n      \"method\": \"Site-specific installation of succinyl lysine analogue via amber suppression, mononucleosome binding assay, nucleosomal DNA accessibility/unwrapping assay\",\n      \"journal\": \"RSC chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — chemical biology reconstitution with site-specific modification mimic, direct in vitro binding and DNA accessibility assays\",\n      \"pmids\": [\"34458839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Both HMGN1 and HMGN2 increase the winding angle of nucleosomal DNA as measured by circular dichroism spectroscopy using reconstituted nucleosomes, but the magnitude of structural changes induced by HMGN1 and HMGN2 differs significantly, suggesting they have different abilities to facilitate nucleosome remodeling.\",\n      \"method\": \"Circular dichroism (CD) spectroscopy of nucleosomes reconstituted from recombinant unmodified histones and synthetic DNA, binding with HMGN1 and HMGN2\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro structural assay with reconstituted nucleosomes, single method, single lab\",\n      \"pmids\": [\"23772392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HMGN2 interacts with the transcription factor Lef-1 through its HMG-box domain (and also with Dlx2, FoxJ1, and Pitx2), and this interaction inhibits Lef-1 DNA-binding activity as demonstrated by EMSA. HMGN2 associates with H4K5ac and H3K4me2 chromatin marks at the Dlx2 promoter. MiR-23a and miR-23b directly target Hmgn2 mRNA, and ablation of Hmgn2 in mice results in increased amelogenin expression due to increased Pitx2, Dlx2, Lef-1, and FoxJ1 transcriptional activity.\",\n      \"method\": \"Bimolecular fluorescence complementation (BiFC), pull-down, co-immunoprecipitation, EMSA, ChIP for histone marks, miRNA target validation, Hmgn2 knockout mouse\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal binding assays (BiFC, pulldown, Co-IP), EMSA for functional inhibition, ChIP, in vivo knockout phenotype, miRNA validation\",\n      \"pmids\": [\"35872015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1983,\n      \"finding\": \"HMG17 greatly facilitates the catenation of double-stranded DNA rings by DNA topoisomerases (type I and type II). Even at low DNA concentrations where catenanes are not otherwise formed, HMG17 promotes catenation of >95% of input DNA into large networks. This is demonstrated by gel electrophoresis and electron microscopy.\",\n      \"method\": \"In vitro DNA catenation assay with DNA topoisomerases I and II, gel electrophoresis, electron microscopy, restriction enzyme cleavage\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted enzymatic assay, multiple topoisomerases tested, structural validation by EM, single lab study\",\n      \"pmids\": [\"6326673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1981,\n      \"finding\": \"HMGN2 (HMG-17) and HMG-14 bind preferentially to single-stranded DNA compared to double-stranded DNA, as demonstrated by sequential chromatography on immobilized ss- and dsDNA columns.\",\n      \"method\": \"Sequential affinity chromatography on immobilized ssDNA and dsDNA columns with purified HMG-17 protein\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro binding assay with purified protein, single method, single lab\",\n      \"pmids\": [\"7279673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of HMGN2 in pluripotent embryonal carcinoma cells leads to a global reduction in H3K9 acetylation and disrupts the H3K4me3, H3K9ac, H3K27ac, and H3K122ac profile at the Nanog and Oct4 loci. At endodermal/mesodermal genes, Hmgn2-knockout cells show a switch from bivalent to repressive chromatin configuration. Loss of HMGN2 leads to increased spontaneous neuronal differentiation and loss of pluripotency markers.\",\n      \"method\": \"Hmgn2 knockout in embryonal carcinoma cells, ChIP for multiple histone marks at specific loci, gene expression analysis, differentiation marker profiling\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout with ChIP for multiple histone marks at specific loci, functional differentiation phenotype, single lab\",\n      \"pmids\": [\"31831052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"An N-terminal fragment of HMGN2 (F3, residues corresponding to a 31 amino acid peptide) homes to tumor vasculature and tumor cell nuclei in vivo after intravenous injection. Fluorescein-labeled F3 peptide is internalized by tumor cells, appearing first in cytoplasm then in nuclei of tumor endothelial cells and tumor cells.\",\n      \"method\": \"Phage-displayed cDNA library screening with in vivo tumor homing selection, fluorescein-labeled peptide internalization in tumor cell lines and in vivo xenograft models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro and in vivo localization/internalization experiment with functional payload delivery, single lab\",\n      \"pmids\": [\"12032302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HMGN1 and HMGN2 preferentially bind nucleosomes containing acetylated H3 tail residues and nucleosomes with the histone variant H2A.Z. Binding of HMGN1 and HMGN2 to nucleosomes reduces p300-mediated acetylation of H3K18, H3K23, and H3K27 in vitro. Loss of both HMGN1 and HMGN2 in mouse embryonic stem cells leads to increased steady-state levels of H3K27me2 and H3K27me3, but not H3 tail acetylation, and downregulation of ~1000 genes including cell identity genes.\",\n      \"method\": \"mESC knockout of Hmgn1 and/or Hmgn2 using gene engineering, nucleosome binding assays with modified/variant nucleosomes, in vitro p300 acetylation assays, epiproteomic mass spectrometry for histone modifications, RNA-seq for gene expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro nucleosome binding assay with defined modified/variant substrates, in vitro acetyltransferase assay with p300, epiproteomic MS, clean knockout in mESCs — multiple orthogonal rigorous methods\",\n      \"pmids\": [\"41325801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HMGN2 binds to histones at the CDC20 promoter and promotes the stability of H3K27ac acetylation in the CDC20 promoter region, thereby enhancing CDC20 transcriptional activity and increasing glioma cell proliferation. ChIP assay confirmed HMGN2 occupancy at the CDC20 promoter.\",\n      \"method\": \"ChIP assay for HMGN2 and H3K27ac at CDC20 promoter, HMGN2 knockdown and overexpression, CDC20 transcription reporter, cell proliferation assays\",\n      \"journal\": \"Genes & diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP for HMGN2 and histone mark at specific locus, functional gene expression and proliferation readout, single lab\",\n      \"pmids\": [\"40092489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The alpha-helical domain of HMGN2 (residues 18-48) is necessary and sufficient for its antimicrobial activity. Synthetic peptides corresponding to this domain had the same minimal inhibitory concentrations against E. coli, P. aeruginosa, and C. albicans as the full-length protein. N-terminal and C-terminal fragments lacking this domain had no antimicrobial activity.\",\n      \"method\": \"Structure prediction, synthesis of HMGN2 domain peptides, antimicrobial assays (MIC, MEC, MBC) with purified recombinant and synthetic peptides\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro antimicrobial reconstitution with domain deletion/fragment analysis, direct functional assay, single lab\",\n      \"pmids\": [\"16115376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HMGN2 facilitates nuclear translocation of the transcription factor Nrf2 upon pyocyanin (PCN) stimulation in A549 lung epithelial cells, thereby elevating antioxidant gene expression and reducing intracellular ROS. HMGN2 also regulates actin cytoskeleton rearrangement in both PCN-dependent and independent manners, and specifically attenuates PCN-mediated Pseudomonas aeruginosa internalization via ROS elimination.\",\n      \"method\": \"HMGN2 knockdown/overexpression in A549 cells, Nrf2 nuclear localization assay, ROS measurement, actin cytoskeleton imaging, PA internalization assay\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional HMGN2 KD/OE with mechanistic readouts (Nrf2 localization, ROS, actin), multiple orthogonal assays, single lab\",\n      \"pmids\": [\"28408162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HMGN2 deficiency in macrophages promotes M1 polarization and enhances NF-κB and MAPK signaling in response to non-tuberculous mycobacteria (NTM) infection, resulting in enhanced NO production and reduced NTM survival within macrophages. HMGN2 knockdown thus enhances the antimycobacterial innate immune response.\",\n      \"method\": \"HMGN2 siRNA knockdown in macrophages, NTM infection assay, M1/M2 polarization marker measurement, NF-κB and MAPK signaling analysis, NO production assay, intracellular NTM survival assay\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional KD with multiple signaling pathway readouts and functional bactericidal assay, single lab\",\n      \"pmids\": [\"31596045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HMGN2 SUMOylation (mediated by PIAS1) enhances HMGN2 interaction with the transcription factor PAX5, thereby inhibiting PAX5 activity and driving macrophage polarization toward pro-inflammatory M1 phenotype. PIAS1 knockdown reduces HMGN2 SUMOylation, suppresses HMGN2-PAX5 binding, reduces inflammatory cytokine release, and reduces atherosclerotic plaque formation in ApoE-/- mice.\",\n      \"method\": \"PIAS1 knockdown, HMGN2 SUMOylation measurement, Co-IP of HMGN2 and PAX5, macrophage polarization assay, NF-κB signaling analysis, ELISA for cytokines, in vivo ApoE-/- atherosclerosis model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of HMGN2-PAX5, SUMOylation modulation, multiple functional readouts in vitro and in vivo, single lab\",\n      \"pmids\": [\"40834970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Knockout or knockdown of human HMGN1 alone or in combination with HMGN2 does not render human cells sensitive to UV light or transcription-blocking DNA lesions, does not impair transcription restart after UV, and GFP-HMGN1 is not recruited to UV-induced DNA damage sites nor to the TCR complex. This indicates that human HMGN1 and HMGN2 are NOT required for transcription-coupled DNA repair (negative finding).\",\n      \"method\": \"HMGN1/HMGN2 knockout and knockdown in human cells, UV and Illudin S sensitivity assays, transcription restart assay, GFP-HMGN1 recruitment to UV damage sites, Co-IP with TCR complex components\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean human cell KO/KD, multiple orthogonal assays including recruitment imaging and Co-IP, replicated across HMGN1 and HMGN2, explicitly negative result\",\n      \"pmids\": [\"32152397\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HMGN2 (formerly HMG-17) is a nucleosome-binding non-histone chromosomal protein that binds preferentially to nucleosome core particles (two molecules per nucleosome, via a defined nucleosome-binding domain requiring histone tails) at sites flanking the dyad axis, clusters in discrete nuclear domains downstream of active transcription start sites, and functions as a chromatin-specific coactivator that unfolds higher-order chromatin structure to enhance transcription initiation efficiency and DNA replication from chromatin templates; its activity and chromatin affinity are regulated by post-translational modifications including PCAF-mediated acetylation at K2 (reducing nucleosome binding), HDAC6-mediated deacetylation (which promotes Stat5a/PRLr-mediated transcription), PIAS1-mediated SUMOylation at K17/K35 (reducing nucleosome binding and regulating PAX5 interactions), and succinylation at K30 (reducing chromatin recruitment); it is actively imported into the nucleus via importin alpha after mitotic release from chromatin; it acts as a molecular switch in Wnt/beta-catenin signaling by inhibiting homeodomain transcription factor DNA-binding activity, a repression reversed by beta-catenin; and it participates in global genome nucleotide excision repair by facilitating repair protein access to chromatin.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HMGN2 (formerly HMG-17) is a nucleosome-binding non-histone chromosomal protein that modulates higher-order chromatin structure to regulate transcription, replication, and DNA repair [#1, #2]. It binds nucleosome core particles through a discrete 30-residue nucleosome-binding domain that functions as an independent module, requiring the histone tails for binding and occupying defined sites flanking the dyad axis, with two molecules per nucleosome that overlap the linker-histone H1/H5 footprint [#2, #3]. HMGN2-containing nucleosomes are organized in clusters of ~6 contiguous particles segregated into nuclear domains distinct from the related HMG-14, and localize downstream of active transcription start sites at sites of RNA polymerase II activity [#8, #9, #7]. Functionally, HMGN2 acts as a chromatin-specific coactivator: incorporated into chromatin during assembly, it unfolds chromatin to enhance activator-dependent transcription initiation and to stimulate replication, effects seen only with chromatin and not naked DNA templates [#1, #4, #5]. Mechanistically it counteracts the linker histone, facilitating dissociation of H1 to grant transcription-factor access, and shapes histone modification landscapes by binding acetylated and H2A.Z-containing nucleosomes and restraining p300-mediated H3 acetylation [#13, #24]. HMGN2 chromatin affinity is tuned by post-translational modifications mapping to its N-terminus and binding domain: PCAF acetylation at K2 reduces nucleosome binding while HDAC6-mediated K2 deacetylation promotes Stat5a-driven transcription; PIAS1-mediated SUMOylation at K17/K35 and succinylation at K30 both reduce nucleosome binding and increase DNA accessibility [#0, #12, #14, #17]. Beyond chromatin, HMGN2 binds homeodomain and HMG-box transcription factors including PITX2 and Lef-1 and inhibits their DNA binding, acting as a Wnt/beta-catenin-reversible repressive switch, and it contributes to global-genome nucleotide excision repair by facilitating repair-protein access to lesions in chromatin [#10, #19, #15]. Hmgn2 loss causes embryonic lethality and perturbs the histone-modification state and pluripotency program of stem cells [#10, #22, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 1981,\n      \"claim\": \"Established the basic nucleic-acid binding preference of HMGN2, framing it as a chromatin-associated protein with single-stranded DNA affinity.\",\n      \"evidence\": \"Sequential affinity chromatography of purified protein on immobilized ss- and dsDNA columns\",\n      \"pmids\": [\"7279673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the physiological binding substrate (nucleosome vs. free DNA)\", \"Single method, no structural mapping\"]\n    },\n    {\n      \"year\": 1983,\n      \"claim\": \"Showed HMGN2 can influence DNA topology by facilitating topoisomerase-mediated catenation, hinting at an architectural role on DNA.\",\n      \"evidence\": \"In vitro catenation assays with topoisomerases I and II, gel electrophoresis and electron microscopy\",\n      \"pmids\": [\"6326673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biological relevance to chromatin in cells unclear\", \"Mechanism of catenation enhancement not defined\"]\n    },\n    {\n      \"year\": 1987,\n      \"claim\": \"Answered where HMGN2 acts within genes, placing it specifically in coding regions downstream of transcription start sites rather than upstream regulatory elements.\",\n      \"evidence\": \"Monoclonal antibody immunoisolation of oligonucleosomes with gene-specific hybridization in chicken liver and oviduct\",\n      \"pmids\": [\"3665881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish causality between localization and transcription\", \"Limited to three genes\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Defined the modular nucleosome-binding domain of HMGN2 and showed binding requires the histone tails, establishing the structural basis of nucleosome recognition.\",\n      \"evidence\": \"EMSA, thermal denaturation, DNase I footprinting with synthetic peptides and trypsin-stripped nucleosomes\",\n      \"pmids\": [\"1453455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic structure of the domain-nucleosome interface\", \"Functional consequence in cells addressed separately\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Demonstrated that HMGN2 incorporated during chromatin assembly stabilizes nucleosome structure and increases transcriptional potential, linking assembly-coupled deposition to function.\",\n      \"evidence\": \"Xenopus egg extract replication/assembly system with in vitro transcription and nucleosomal ladder analysis\",\n      \"pmids\": [\"8404854\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Timing requirement mechanism not resolved\", \"Does not identify transcription machinery contacted\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Established HMGN2 as a chromatin-specific transcriptional coactivator acting at initiation, defining its core mechanistic role.\",\n      \"evidence\": \"Reconstituted nucleosomal-array in vitro transcription with GAL4-VP16, chromatin vs. naked DNA controls\",\n      \"pmids\": [\"7649479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify the molecular target unfolded\", \"Activator-dependence mechanism not detailed\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Mapped the precise nucleosomal contacts of HMGN2 and showed two molecules bind per core near the dyad, overlapping the linker-histone site — predicting antagonism with H1.\",\n      \"evidence\": \"Hydroxyl radical footprinting on nucleosome cores and chromatosomes\",\n      \"pmids\": [\"8107104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional H1 antagonism shown only later\", \"No information on higher-order fiber arrangement\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Revealed HMGN2 occupies clustered, contiguous nucleosomes in discrete nuclear domains distinct from HMG-14, indicating non-random genomic and spatial organization.\",\n      \"evidence\": \"Confocal immunofluorescence and reciprocal immunofractionation of defined oligonucleosomes\",\n      \"pmids\": [\"9417927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of cluster targeting unknown\", \"Functional meaning of HMGN segregation unclear\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Connected HMGN2 chromatin association to ongoing transcription and to cell-cycle-regulated nuclear import, establishing it as a dynamic, importin-alpha-dependent chromatin factor.\",\n      \"evidence\": \"Immunofluorescence across cell cycle, peptide displacement in permeabilized cells, transcription inhibition, importin-alpha-dependent reconstituted nuclear import assays\",\n      \"pmids\": [\"9843505\", \"9852141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define how transcription state controls chromatin retention\", \"Import signal characterized but upstream regulation unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Extended the coactivator role to DNA replication, showing assembly-coupled HMGN2 incorporation enhances replication of chromatin templates.\",\n      \"evidence\": \"In vitro SV40 minichromosome replication assay with chromatin vs. naked DNA and timing controls\",\n      \"pmids\": [\"9545265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Replication machinery contacts not identified\", \"In vivo replication role untested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified PCAF acetylation of HMGN2 at K2 as a regulatory modification that lowers nucleosome affinity, providing the first PTM-based control of chromatin binding and ordering it before histone acetylation.\",\n      \"evidence\": \"In vitro PCAF acetyltransferase assay, mass-spec site mapping, equilibrium dialysis binding, deletion mutants\",\n      \"pmids\": [\"10207070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo acetylation dynamics not fully resolved\", \"Functional consequence for transcription shown later\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed an N-terminal HMGN2 fragment functions as a tumor-homing, cell-penetrating peptide, revealing an unexpected extracellular/delivery property.\",\n      \"evidence\": \"In vivo phage-display tumor homing selection and fluorescent peptide internalization in xenografts\",\n      \"pmids\": [\"12032302\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship to nuclear chromatin function unclear\", \"Receptor/uptake mechanism unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated a distinct antimicrobial function residing in the HMGN2 alpha-helical domain, separable from chromatin binding.\",\n      \"evidence\": \"Domain peptide synthesis and antimicrobial MIC/MEC/MBC assays against bacteria and fungi\",\n      \"pmids\": [\"16115376\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of microbial killing not defined\", \"In vivo relevance of secreted/extracellular HMGN2 unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established HMGN2 as a beta-catenin-reversible molecular switch controlling homeodomain transcription factor DNA binding, broadening its role to Wnt-pathway signaling.\",\n      \"evidence\": \"Co-IP, DNA-binding and luciferase assays with PITX2 and beta-catenin; Hmgn2 knockout mouse (embryonic lethal)\",\n      \"pmids\": [\"18045789\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full reconstitution of ternary switch not shown\", \"Causal link of lethality to PITX2 axis untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed HMGN2 in the global-genome nucleotide excision repair subpathway, acting by facilitating repair-protein access to chromatin rather than the repair chemistry.\",\n      \"evidence\": \"DT40 chicken knockouts, UV survival, G2-M checkpoint, lesion-removal and host-cell reactivation assays\",\n      \"pmids\": [\"19843163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Species-specific (later contradicted in human cells)\", \"Repair factors recruited not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked HMGN2 to receptor signaling, showing phosphorylation-dependent binding to nuclear PRLr enables Stat5a-responsive transcription and growth.\",\n      \"evidence\": \"Co-IP of nuclear PRLr with HMGN2, ChIP, transcriptional reporter assays\",\n      \"pmids\": [\"21816901\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, no reciprocal structural validation\", \"Generality across Stat5 targets unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed HMGN2 amplifies NF-kB-driven beta-defensin induction by prolonging p65 nuclear retention and modification, connecting it to innate immune transcription.\",\n      \"evidence\": \"HMGN2 knockdown/overexpression, p65 localization, HAT activity, phosphorylation, ChIP at HBD-2 promoter\",\n      \"pmids\": [\"21518253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect effect on p65 not resolved\", \"Single cell-line system\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided structural evidence that HMGN2 alters nucleosomal DNA winding, with quantitatively different effects from HMGN1, indicating paralog-specific remodeling capacity.\",\n      \"evidence\": \"Circular dichroism spectroscopy of reconstituted nucleosomes with recombinant HMGN1/HMGN2\",\n      \"pmids\": [\"23772392\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of winding change not tested\", \"Single biophysical method\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified PIAS1-mediated SUMOylation at K17/K35 within the binding domain as a signal-responsive PTM that lowers nucleosome affinity, with SENP1 as the eraser.\",\n      \"evidence\": \"In vitro SUMOylation, site mutagenesis, E3/deSUMOylase identification, nucleosome binding with purified SUMOylated protein\",\n      \"pmids\": [\"24872413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo SUMOylation stoichiometry unclear\", \"Downstream transcriptional effect characterized later\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected the K2 acetylation switch to disease, showing HDAC6 deacetylation of HMGN2 promotes Stat5a transcription and breast cancer growth.\",\n      \"evidence\": \"HDAC6 inhibition in vitro and in vivo, K2 acetylation measurement, Stat5a activity and tumor growth assays, patient tissue analysis\",\n      \"pmids\": [\"27358110\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HDAC6-HMGN2 enzyme-substrate kinetics not shown\", \"Other HDAC6 substrates may contribute\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved the mechanism of HMGN2 coactivation in PRL signaling: it promotes STAT5 access by facilitating linker-histone H1 dissociation, fulfilling the prediction from its dyad-overlapping footprint.\",\n      \"evidence\": \"HMGN2 and H1 knockdown epistasis, STAT5 ChIP, PRL-induced transcription and proliferation assays\",\n      \"pmids\": [\"28035005\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct competition with H1 on nucleosomes not biochemically reconstituted\", \"Genome-wide scope untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated HMGN2 maintains the histone-modification landscape and pluripotency program of stem cells, with loss shifting bivalent to repressive chromatin and triggering differentiation.\",\n      \"evidence\": \"Hmgn2 knockout embryonal carcinoma cells, ChIP for multiple histone marks at pluripotency/lineage loci, differentiation profiling\",\n      \"pmids\": [\"31831052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking HMGN2 to specific mark changes unclear\", \"Single cell model\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended HMGN2 to macrophage immune regulation, where its deficiency promotes M1 polarization and antimycobacterial responses via NF-kB/MAPK signaling.\",\n      \"evidence\": \"siRNA knockdown in macrophages, NTM infection, polarization markers, signaling and NO assays\",\n      \"pmids\": [\"31596045\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chromatin-based vs. signaling mechanism not separated\", \"Direct gene targets not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established that, in human cells, HMGN1/HMGN2 are NOT required for transcription-coupled repair, refining the repair role to global-genome NER and revealing species or pathway specificity.\",\n      \"evidence\": \"Human cell KO/KD, UV and Illudin S sensitivity, transcription restart, GFP-HMGN1 recruitment imaging, TCR complex Co-IP (negative result)\",\n      \"pmids\": [\"32152397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not test global-genome NER in human cells directly\", \"Reconciliation with DT40 GG-NER finding incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Added succinylation at K30 to the PTM repertoire, showing this modification reduces nucleosome binding and increases DNA accessibility via entry/exit unwrapping.\",\n      \"evidence\": \"Amber-suppression installation of succinyl-lysine analogue, mononucleosome binding and DNA accessibility assays\",\n      \"pmids\": [\"34458839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular enzymes adding/removing K30 succinyl unknown\", \"Transcriptional consequence not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Generalized the transcription-factor inhibitory switch beyond PITX2, showing HMG-box-mediated binding to Lef-1, Dlx2 and FoxJ1 inhibits their DNA binding and that miR-23a/b regulate Hmgn2 to control amelogenin expression in vivo.\",\n      \"evidence\": \"BiFC, pull-down, Co-IP, EMSA, histone-mark ChIP, miRNA target validation, Hmgn2 knockout mouse\",\n      \"pmids\": [\"35872015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of HMG-box-TF interaction not resolved\", \"Switch reversibility for these factors not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed locus-specific coactivation in cancer, with HMGN2 stabilizing H3K27ac at the CDC20 promoter to enhance transcription and glioma proliferation.\",\n      \"evidence\": \"ChIP for HMGN2 and H3K27ac at CDC20 promoter, knockdown/overexpression, reporter and proliferation assays\",\n      \"pmids\": [\"40092489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How HMGN2 stabilizes the mark mechanistically unclear\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linked HMGN2 SUMOylation to inflammatory disease, showing PIAS1-driven SUMOylation enhances HMGN2-PAX5 binding to inhibit PAX5, drive M1 polarization, and promote atherosclerosis.\",\n      \"evidence\": \"PIAS1 knockdown, SUMOylation measurement, HMGN2-PAX5 Co-IP, polarization and cytokine assays, ApoE-/- atherosclerosis model\",\n      \"pmids\": [\"40834970\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SUMO-dependent structural basis of PAX5 binding not shown\", \"In vivo causality is correlative\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the chromatin-shaping mechanism, showing HMGN1/2 prefer acetylated and H2A.Z nucleosomes, restrain p300 acetylation, and protect against H3K27 methylation to maintain cell-identity gene expression.\",\n      \"evidence\": \"mESC Hmgn1/2 knockouts, modified/variant nucleosome binding, in vitro p300 assays, epiproteomic MS, RNA-seq\",\n      \"pmids\": [\"41325801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking HMGN binding to H3K27me protection not defined\", \"Direct PRC2 antagonism untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HMGN2's diverse activities — nucleosome-affinity tuning by PTMs, linker-histone antagonism, transcription-factor sequestration, and histone-modification shaping — are integrated and selectively deployed across cell types remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of HMGN2 on the nucleosome\", \"Genome-wide rules for cluster targeting and TF-switch deployment unknown\", \"Reconciliation of pro- and anti-tumor / pro- and anti-inflammatory roles across contexts\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 10, 19, 11]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [2, 3, 24]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [21, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 13, 19, 24]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [13, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 7, 9]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [2, 3, 8]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [7, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 7, 8]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [2, 3, 24]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 28, 29]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PITX2\", \"LEF1\", \"PAX5\", \"PRLR\", \"STAT5A\", \"PIAS1\", \"RELA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}