{"gene":"HJURP","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2009,"finding":"HJURP forms a prenucleosomal complex with CENP-A, histone H4, and nucleophosmin 1, and is required for recruitment of new CENP-A into nucleosomes at replicated centromeres during G1 phase. Recognition by HJURP is mediated through the centromere targeting domain (CATD) of CENP-A.","method":"Co-immunoprecipitation, mass spectrometry, RNAi knockdown with centromeric CENP-A quantification, cell-cycle analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP/MS identifying complex components, RNAi loss-of-function with defined centromeric phenotype, replicated independently in companion paper (PMID:19410545)","pmids":["19410544"],"is_preprint":false},{"year":2009,"finding":"HJURP is specifically found in CENP-A-containing non-nucleosomal complexes but not in H3.1- or H3.3-containing complexes, indicating specificity for CENP-A. HJURP centromeric localization is cell-cycle regulated, transiently appearing at centromeres coinciding with the window of new CENP-A deposition. HJURP downregulation causes major reduction in centromeric CENP-A and impairs deposition of newly synthesized CENP-A, causing mitotic defects.","method":"Biochemical purification of non-nucleosomal CENP-A complexes, Co-IP, RNAi knockdown, immunofluorescence, cell-cycle analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — purification of endogenous complexes, reciprocal validation, loss-of-function phenotype, independent replication in companion paper (PMID:19410544)","pmids":["19410545"],"is_preprint":false},{"year":2010,"finding":"Bacterially expressed HJURP binds the CENP-A/H4 tetramer but not the H3/H4 tetramer at a stoichiometric ratio. Binding occurs through a conserved N-terminal domain of HJURP (the CENP-A binding domain, CBD), and the TLTY box within this domain is essential for HJURP–CENP-A/H4 complex formation. HJURP facilitates efficient deposition of CENP-A/H4 tetramers onto naked DNA in vitro.","method":"Bacterial expression, pull-down binding assays, in vitro chromatin deposition assay, mutational analysis of the TLTY box","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of CENP-A/H4 deposition, mutagenesis of binding domain, stoichiometric binding assays; single lab but multiple orthogonal methods","pmids":["20080577"],"is_preprint":false},{"year":2010,"finding":"H3K4me2 at the centromere is required for efficient HJURP recruitment and subsequent CENP-A incorporation. Specific depletion of H3K4me2 using tethered LSD1 demethylase from a synthetic human artificial chromosome caused loss of centromeric transcription and failure to recruit HJURP, leading to gradual CENP-A loss and kinetochore inactivation.","method":"Epigenetic tethering (LSD1-LacI fusion to HAC LacO array), ChIP, immunofluorescence, centromere function assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct functional manipulation of histone modification with defined HJURP recruitment and CENP-A incorporation readouts, multiple orthogonal methods in one study","pmids":["21157429"],"is_preprint":false},{"year":2011,"finding":"HJURP is a chromatin assembly factor sufficient to drive stable recruitment of CENP-A to a noncentromeric LacO array when fused to LacI, and an amino-terminal fragment of HJURP assembles CENP-A nucleosomes in vitro. Ectopically targeted CENP-A chromatin is sufficient to direct assembly of a functional centromere including kinetochore proteins and stable kinetochore-microtubule attachments. HJURP recruitment to endogenous centromeres requires the Mis18 complex.","method":"LacI-LacO tethering assay, in vitro chromatin assembly with recombinant N-terminal HJURP fragment, immunofluorescence, kinetochore assembly readouts (NDC80 recruitment, microtubule attachment), RNAi of Mis18 complex components","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro chromatin assembly reconstitution combined with ectopic targeting assay and functional kinetochore readouts; multiple orthogonal methods","pmids":["21768289"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of an HJURP–CENP-A–histone H4 complex shows that HJURP binds a CENP-A–H4 heterodimer. The C-terminal β-sheet domain of HJURP caps the DNA-binding region of the histone heterodimer, preventing spontaneous DNA association. A novel site in CENP-A distinguishes it from histone H3 in its ability to bind HJURP.","method":"X-ray crystallography of HJURP–CENP-A–H4 complex, structural analysis and mutagenesis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional interpretation, novel CENP-A binding site identified; single lab but structure is definitive method","pmids":["21478274"],"is_preprint":false},{"year":2011,"finding":"Xenopus HJURP (xHJURP), a member of the HJURP/Scm3 family, is required for CENP-A deposition in a Xenopus egg extract system that recapitulates spatial and temporal specificity of CENP-A loading. Human HJURP can substitute for xHJURP despite little sequence homology. Condensin II (but not condensin I) is also required for CENP-A assembly and contributes to retention of centromeric CENP-A nucleosomes.","method":"Xenopus egg extract in vitro CENP-A deposition assay, immunodepletion, complementation with human HJURP, condensin I/II-selective depletion","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cell-free reconstitution system with immunodepletion and complementation; ortholog study with functional validation","pmids":["21321101"],"is_preprint":false},{"year":2012,"finding":"Surface-exposed residues in the CENP-A targeting domain (CATD) are the primary sequence determinants for HJURP recognition, while buried CATD residues generating rigidity with H4 are also required for efficient centromeric incorporation. HJURP contact points adjacent to the CATD transmit stability throughout the histone fold domains of CENP-A and H4. An intact CENP-A/CENP-A interface is required for stable chromatin incorporation immediately upon HJURP-mediated assembly.","method":"Structure-guided mutagenesis of CENP-A and HJURP contact surfaces, in vitro binding assays, centromere incorporation assays in cells","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with in vitro binding and in-cell incorporation assays; mechanistic dissection of recognition vs. stabilization surfaces","pmids":["22406139"],"is_preprint":false},{"year":2013,"finding":"HJURP forms a homodimer through its C-terminal domain (including the second HJURP_C domain). HJURP exists as a dimer in the soluble pre-assembly complex and at chromatin during new CENP-A deposition. Dimerization is essential for deposition of new CENP-A nucleosomes but is not required for HJURP recruitment to centromeres or CENP-A binding.","method":"Crystallographic and biochemical analysis of HJURP dimerization domain, gel filtration, cross-linking, separation-of-function mutants in cells, centromeric CENP-A quantification","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical and structural demonstration of dimerization, separation-of-function mutants distinguishing dimerization from recruitment and binding; multiple orthogonal methods","pmids":["23771058"],"is_preprint":false},{"year":2014,"finding":"Cell-cycle-dependent recruitment of HJURP to centromeres depends on its phosphorylation by cyclin-dependent kinases. A nonphosphorylatable HJURP mutant localizes prematurely to centromeres in S and G2 phase, causing premature CENP-A loading and cell-cycle delays. Once at centromeres, HJURP promotes CENP-A deposition through a DNA-binding domain.","method":"Phosphosite mapping, nonphosphorylatable/phosphomimetic HJURP mutants, immunofluorescence, cell-cycle analysis, in vitro DNA-binding assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — phospho-mutant functional analysis with multiple cellular readouts and in vitro DNA binding; mechanistic link between phosphorylation and centromere recruitment demonstrated","pmids":["25001279"],"is_preprint":false},{"year":2014,"finding":"Human HJURP directly binds Mis18β through a minimal region mapping to residues 437–460. Depletion of Mis18β by RNAi dramatically impairs HJURP recruitment to centromeres. CDK1 phosphorylation of HJURP weakens its interaction with Mis18β, linking cell-cycle regulation to CENP-A deposition timing.","method":"Co-IP, GST pulldown, domain mapping, RNAi depletion of Mis18β, CDK1 phosphorylation assay, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding mapped to specific residues, loss-of-function rescue, phosphorylation biochemistry; multiple orthogonal methods in one study","pmids":["24519934"],"is_preprint":false},{"year":2015,"finding":"The middle region of HJURP associates with the Mis18 complex protein M18BP1/KNL2, and the HJURP–M18BP1 association is required for HJURP function. HJURP also exhibits a centromere expansion activity separable from its CENP-A-binding activity, demonstrated by ectopic HJURP localization inducing expansion of artificial and natural centromeres.","method":"Co-IP, DT40 knockout cell lines, gene replacement with domain mutants, ectopic HJURP localization assay, immunofluorescence of centromere size","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout complementation with separation-of-function mutants plus direct binding and ectopic targeting assays; multiple orthogonal methods","pmids":["26063729"],"is_preprint":false},{"year":2016,"finding":"HJURP selectively associates with the condensin II complex (not condensin I) during G1, recruits condensin II subunit CAPH2 to centromeres at the time of CENP-A deposition, and induces decondensation of a noncentromeric LacO array. Condensin II function at the centromere is required for new CENP-A deposition in human cells.","method":"Co-IP distinguishing condensin I vs. II, immunofluorescence of CAPH2 centromere localization, LacO/LacI decondensation assay, RNAi of CAPH2, CENP-A incorporation quantification","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — selective Co-IP, ectopic assay, and functional knockdown with CENP-A deposition readout; multiple orthogonal methods","pmids":["27807043"],"is_preprint":false},{"year":2018,"finding":"During S phase, HJURP transiently associates with centromeres and binds pre-existing CENP-A, and is required for centromeric nucleosome inheritance during DNA replication. HJURP co-purifies with the MCM2-7 helicase complex and, together with the MCM2 subunit, binds CENP-A simultaneously, suggesting a mechanism for parental CENP-A retention at the replication fork.","method":"BioID proximity labeling during S phase, co-immunoprecipitation of HJURP with MCM2-7, CENP-A retention assays after replication, HJURP depletion with S-phase-specific readouts","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — BioID proximity labeling plus reciprocal Co-IP plus loss-of-function with S-phase-specific CENP-A retention readout; multiple orthogonal methods","pmids":["30293838"],"is_preprint":false},{"year":2018,"finding":"HJURP antagonizes ectopic CENP-A deposition driven by H3.3 chaperones HIRA and DAXX; the correct balance between HJURP and CENP-A levels is essential to preclude ectopic assembly by H3.3 chaperones.","method":"RNAi knockdown of HJURP, HIRA, and DAXX in human cancer cells; ChIP and immunofluorescence to quantify ectopic CENP-A; epistasis analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNAi epistasis with ChIP readout; single lab, limited orthogonal methods","pmids":["30365520"],"is_preprint":false},{"year":2019,"finding":"Two repeats in human HJURP proposed to be functionally distinct are in fact interchangeable and bind concomitantly to the 4:2:2 Mis18α:Mis18β:M18BP1 complex without dissociating it. HJURP binds CENP-A:H4 dimers, requiring two Mis18αβ:M18BP1:HJURP complexes (or consecutive rounds by the same complex) to assemble CENP-A:H4 tetramers. Mis18α N-terminal tails blockade two identical HJURP-repeat binding sites near Mis18αβ C-terminal helices, identified by photo-cross-linking and mutated to separate Mis18 from HJURP centromere recruitment.","method":"Biochemical reconstitution of Mis18 complex with HJURP repeats, photo-cross-linking, mutational analysis, in-cell centromere recruitment assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution, photo-cross-linking, mutagenesis, and functional in-cell assays; multiple orthogonal methods in one study","pmids":["31492860"],"is_preprint":false},{"year":2019,"finding":"CENP-A nucleosomes form characteristic rosette-like clusters (~250–300 nm) during G1, with HJURP located at the center of each rosette serving as a nucleation point for CENP-A assembly, as revealed by 2D/3D super-resolution microscopy.","method":"2D and 3D super-resolution microscopy (dSTORM/PALM), segmentation analysis, co-localization of HJURP and CENP-A","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — super-resolution imaging with quantitative colocalization; direct structural/localization observation but no functional perturbation to validate nucleation role","pmids":["31570711"],"is_preprint":false},{"year":2020,"finding":"The yeast HJURP ortholog Scm3 acts as a cochaperone with the ATAD2 homolog Yta7 for Cse4(CENP-A) deposition; Yta7 interacts in vivo with Scm3 and increased Cse4 deposition caused by Yta7 overexpression requires Scm3 activity.","method":"Co-immunoprecipitation of Scm3 with Yta7, genetic epistasis (Yta7 OE requires Scm3), ChIP of centromeric Cse4, chromosome segregation assays in yeast","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast ortholog study; Co-IP plus genetic epistasis plus ChIP; direct relevance to mammalian HJURP function is inferred","pmids":["32079723"],"is_preprint":false},{"year":2020,"finding":"The critical residues mediating CENP-A–HJURP interaction differ between chicken and human; the A59Q mutation in chicken CENP-A α1-helix causes CENP-A misincorporation and cell death, whereas the corresponding human mutation does not. W53 of chicken HJURP (a contact site for A59) is also essential. Introduction of two arginine residues to the chicken HJURP αA-helix suppresses CENP-A misincorporation, revealing species-specific affinity tuning of the CENP-A–HJURP interface.","method":"Point mutagenesis of chicken and human CENP-A and HJURP, DT40 cell complementation assays, cell viability, immunofluorescence of CENP-A incorporation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — comprehensive mutagenesis with functional in-cell rescue, species-specific structure-function dissection; multiple orthogonal methods","pmids":["33207191"],"is_preprint":false},{"year":2007,"finding":"HJURP (then called FAKTS) localizes to the nucleus and interacts with 14-3-3 proteins in mammalian cells. This interaction is enhanced by activated Akt/PKB and is dependent on phosphorylation of Ser479 by AKT/PKB.","method":"Yeast two-hybrid screen, confocal microscopy, co-immunoprecipitation in mammalian cells, Akt overexpression, Ser479 mutational analysis","journal":"Proteins","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP plus mutagenesis confirming Ser479 as interaction mediator; single lab but two orthogonal methods","pmids":["17256767"],"is_preprint":false},{"year":2013,"finding":"HJURP knockdown in human dermal fibroblasts and endothelial cells leads to premature cellular senescence via a p53-dependent pathway; p53 knockdown, but not p16 knockdown, abolishes the senescence phenotype caused by HJURP reduction.","method":"RNAi knockdown of HJURP, ectopic HJURP overexpression in senescent cells, p53 and p16 siRNA epistasis, senescence assays (SA-β-gal, proliferation)","journal":"The journals of gerontology. Series A, Biological sciences and medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic epistasis (p53 vs p16) with clear senescence readout, but single lab, single method type","pmids":["23292286"],"is_preprint":false},{"year":2023,"finding":"HJURP phosphorylation prevents its interaction with CENP-C in metaphase, blocking delivery of soluble CENP-A to centromeres. Non-phosphorylatable HJURP mutants constitutively bind CENP-C in metaphase but are insufficient alone for CENP-A assembly. M18BP1.S also binds CENP-C to competitively inhibit HJURP access to centromeres in metaphase. Removal of both inhibitory activities causes ectopic CENP-A assembly in metaphase.","method":"Cell-free Xenopus egg extract centromere assembly assay, phospho-mutant HJURP, co-immunoprecipitation of HJURP with CENP-C, M18BP1.S competition experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cell-free reconstitution system plus phospho-mutant analysis plus Co-IP; mechanistic dissection of two independent inhibitory activities","pmids":["37141119"],"is_preprint":false},{"year":2018,"finding":"HJURP destabilizes p21 (CDKN1A) in hepatocellular carcinoma cells via MAPK/ERK1/2 and AKT/GSK3β pathways, promoting nucleus-to-cytoplasm translocation and ubiquitin-mediated degradation of p21. HJURP silencing effects on cell growth are reversed by p21 knockdown.","method":"Co-immunoprecipitation, Western blot for p21 stability, immunofluorescence of p21 localization, ERK1/2 inhibitor (U0126) and AKT agonist (SC-79) treatment, ubiquitination assay, genetic epistasis (HJURP KD + p21 KD)","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus pathway inhibitors plus genetic epistasis, but mechanistic link between HJURP and MAPK/AKT is not directly demonstrated; single lab","pmids":["30111352"],"is_preprint":false},{"year":2021,"finding":"HJURP increases ubiquitination of CDKN1A (p21) via the GSK3β/JNK signaling pathway, decreasing its stability and promoting prostate cancer cell proliferation.","method":"Ubiquitination assay, Western blot for p21 stability, pathway inhibitor treatment, HJURP overexpression and knockdown with proliferation readouts in vitro and in vivo","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — ubiquitination assay plus pathway inhibitors; single lab, mechanism linking HJURP to GSK3β/JNK is not directly established","pmids":["34099634"],"is_preprint":false},{"year":2024,"finding":"HJURP is recruited to DNA double-strand break (DSB) sites through a mechanism requiring chromatin PARylation. At DSBs, HJURP promotes turnover of H3K9me3 and HP1, facilitating DNA damage signaling and DSB repair. HJURP overexpression also reorganizes global heterochromatin structure and increases radioresistance in glioma cells.","method":"Laser micro-irradiation to induce DSBs, HJURP-GFP recruitment imaging, PARP inhibitor and PARylation dependency assays, ChIP for H3K9me3 and HP1 at DSBs, comet assay, clonogenic survival after radiation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct imaging of HJURP recruitment to DSBs plus PARylation dependency plus chromatin mark changes; single lab","pmids":["38279062"],"is_preprint":false},{"year":2024,"finding":"HJURP forms disulfide-linked intermediates with PRDX1 through Cys327 and Cys457 residues, promoting PRDX1 redox cycling and inhibiting its hyperoxidation. This interaction enhances PRDX1 peroxidase activity, decreasing ROS levels and suppressing ferroptosis-inducer-induced lipid peroxidation in prostate cancer cells.","method":"Co-IP, disulfide crosslinking assays, cysteine mutagenesis (Cys327 and Cys457), in vitro peroxidase activity assay, ROS and lipid peroxidation measurements, in vitro and in vivo ferroptosis assays","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical demonstration of disulfide intermediates plus mutagenesis of specific cysteines plus in vitro enzymatic activity assay plus functional cell-based validation; multiple orthogonal methods","pmids":["39405980"],"is_preprint":false},{"year":2022,"finding":"HJURP affects ubiquitination of YAP1 protein, regulating its stability and downstream transcriptional activity in triple-negative breast cancer. YAP1 in turn positively regulates NDRG1 transcription by binding its promoter, and the HJURP/YAP1/NDRG1 axis affects cell proliferation and chemotherapy sensitivity.","method":"Co-IP of HJURP and YAP1, ubiquitination assay, promoter binding (ChIP/reporter), HJURP and YAP1 knockdown epistasis, proliferation and chemosensitivity assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and ubiquitination assay with epistasis; single lab, mechanism linking HJURP to YAP1 ubiquitination is not fully established","pmids":["35459269"],"is_preprint":false},{"year":2023,"finding":"NFE2L1 transcriptionally activates HJURP by binding to its promoter, as confirmed by dual luciferase reporter and chromatin immunoprecipitation assays. HJURP inhibition attenuates the proliferation and ferroptosis-suppressive effects of NFE2L1 overexpression in oral squamous cell carcinoma cells.","method":"Dual luciferase reporter assay, ChIP assay for NFE2L1 at HJURP promoter, HJURP knockdown epistasis in NFE2L1-overexpressing cells","journal":"Journal of bioenergetics and biomembranes","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct promoter binding shown by ChIP and reporter assay; single lab, epistasis confirms functional dependency","pmids":["37848756"],"is_preprint":false},{"year":2025,"finding":"HJURP directly binds the C-terminal domain of CENP-C in vitro, and this interaction is essential for new CENP-A incorporation in chicken DT40 cells. CENP-C and the Mis18 complex provide dual, parallel recruitment pathways for HJURP localization to centromeres; abolishing both pathways completely prevents HJURP centromere localization and CENP-A incorporation. CENP-C, HJURP, and Mis18C form a tight association in the chromatin fraction.","method":"In vitro binding assay (recombinant HJURP and CENP-C CTD), HJURP CENP-C-binding mutants in DT40 cells, Mis18C knockout combined with HJURP mutant, Co-IP of CENP-C/HJURP/Mis18C from chromatin fraction, immunofluorescence of CENP-A incorporation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding plus genetic complementation plus Co-IP; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"Under sustained replication stress, ATR promotes CENP-A eviction from centromeres by recruiting the AAA+ ATPase VCP to centromeres, destabilizing CENP-A–containing nucleosomes. HJURP (but not H3 chaperones DAXX or ATRX) is necessary for subsequent nucleolar relocalization of displaced CENP-A.","method":"Replication stress induction, ATR inhibitor treatment, VCP inhibitor/depletion, immunofluorescence of CENP-A localization, HJURP/DAXX/ATRX RNAi epistasis for nucleolar CENP-A","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, epistasis for CENP-A nucleolar localization relies on RNAi, single lab, mechanism linking HJURP to nucleolar CENP-A is indirect","pmids":[],"is_preprint":true}],"current_model":"HJURP is a cell-cycle-regulated, CENP-A-specific histone chaperone that binds CENP-A/H4 heterodimers through its conserved N-terminal domain (recognizing the CATD of CENP-A), forms a homodimer through its C-terminal domain required for octameric nucleosome assembly, and is recruited to centromeres in early G1 by the Mis18α/Mis18β/M18BP1 complex (via direct HJURP repeats binding Mis18α/β) and by direct interaction with CENP-C; its centromeric recruitment is temporally gated by CDK phosphorylation that blocks Mis18β binding in S/G2/M and prevents CENP-C interaction in metaphase, while its DNA-binding domain promotes CENP-A deposition once it arrives; during S phase HJURP additionally cooperates with MCM2 to retain pre-existing CENP-A nucleosomes through replication; it recruits condensin II to facilitate chromatin decondensation for deposition; structurally, the HJURP C-terminal β-sheet domain caps the histone heterodimer DNA-binding surface to prevent premature chromatin association; and beyond centromere biology, HJURP is recruited to DNA double-strand breaks in a PARylation-dependent manner where it promotes H3K9me3/HP1 turnover to facilitate repair, forms disulfide intermediates with PRDX1 to enhance its peroxidase activity and suppress ferroptosis, and interacts with 14-3-3 proteins in an AKT/PKB-phosphorylation-dependent manner at Ser479."},"narrative":{"mechanistic_narrative":"HJURP is the CENP-A-specific histone chaperone that defines and propagates centromere identity by depositing newly synthesized CENP-A nucleosomes during early G1 [PMID:19410544, PMID:19410545]. It recognizes CENP-A through a conserved N-terminal CENP-A-binding domain that engages the CENP-A/H4 heterodimer at a CENP-A-specific surface centered on the CATD, with the TLTY box essential for complex formation and the C-terminal β-sheet domain capping the histone DNA-binding surface to prevent premature chromatin association [PMID:20080577, PMID:21478274, PMID:22406139]; HJURP dimerizes through its C terminus to assemble octameric CENP-A nucleosomes, an activity separable from centromere recruitment and CENP-A binding [PMID:23771058]. HJURP is sufficient to build a functional de novo centromere when ectopically targeted, establishing it as the central chromatin-assembly factor of centromere inheritance [PMID:21768289]. Its centromeric arrival is gated to G1 by two parallel recruitment routes—the Mis18α/Mis18β/M18BP1 complex, engaged through interchangeable HJURP repeats and an M18BP1 contact, and direct binding to the CENP-C C-terminal domain—both of which are required and which CDK phosphorylation suppresses outside G1 by weakening Mis18β binding and blocking CENP-C interaction in metaphase [PMID:24519934, PMID:26063729, PMID:31492860, PMID:37141119]. Beyond deposition, HJURP recruits condensin II to drive the chromatin decondensation that accompanies CENP-A loading and, during S phase, cooperates with the MCM2-7 helicase to retain pre-existing CENP-A nucleosomes through replication [PMID:27807043, PMID:30293838]. Outside centromere biology, HJURP is recruited to DNA double-strand breaks in a PARylation-dependent manner where it promotes H3K9me3/HP1 turnover to facilitate repair [PMID:38279062], forms disulfide intermediates with PRDX1 to enhance its peroxidase activity and suppress ferroptosis [PMID:39405980], and is overexpressed in cancers where it destabilizes p21 [PMID:30111352, PMID:34099634].","teleology":[{"year":2009,"claim":"Established HJURP as the dedicated CENP-A chaperone, answering how new CENP-A is specifically deposited at centromeres during the cell cycle.","evidence":"Co-IP/MS of prenucleosomal complexes, RNAi with centromeric CENP-A quantification and cell-cycle analysis in human cells","pmids":["19410544","19410545"],"confidence":"High","gaps":["Did not resolve the structural basis of CENP-A discrimination","Mechanism of centromere targeting not defined"]},{"year":2010,"claim":"Reconstituted the minimal deposition reaction, showing HJURP's N-terminal domain binds CENP-A/H4 selectively and deposits it onto DNA, proving direct chaperone activity.","evidence":"Bacterial expression, stoichiometric pull-downs, in vitro DNA deposition, TLTY-box mutagenesis","pmids":["20080577"],"confidence":"High","gaps":["Octamer assembly versus tetramer deposition not addressed","No structure of the binding interface"]},{"year":2010,"claim":"Linked a chromatin mark to chaperone recruitment, showing centromeric H3K4me2 and transcription are needed for HJURP loading.","evidence":"LSD1 tethering to a human artificial chromosome, ChIP and centromere function assays","pmids":["21157429"],"confidence":"High","gaps":["Direct molecular link between H3K4me2 and HJURP not defined","Whether transcription or the mark per se is the signal unresolved"]},{"year":2011,"claim":"Demonstrated HJURP is sufficient to seed a functional centromere and depends on the Mis18 complex for endogenous recruitment, defining it as the central epigenetic assembly factor.","evidence":"LacI-LacO ectopic targeting, in vitro chromatin assembly, kinetochore readouts, Mis18 RNAi","pmids":["21768289"],"confidence":"High","gaps":["Direct HJURP–Mis18 contacts not mapped","How recruitment is timed to G1 unresolved"]},{"year":2011,"claim":"Solved the structural basis of CENP-A recognition, showing HJURP caps the histone DNA-binding surface and exploits a CENP-A-specific site to exclude H3.","evidence":"X-ray crystallography of HJURP–CENP-A–H4 with mutagenesis","pmids":["21478274"],"confidence":"High","gaps":["Did not capture the dimeric assembly-competent state","How capping is released for DNA loading not shown"]},{"year":2011,"claim":"Confirmed deposition activity is conserved and identified condensin II as a co-requirement, using a cell-free system that recapitulates loading specificity.","evidence":"Xenopus egg extract deposition, immunodepletion, human HJURP complementation, condensin-selective depletion","pmids":["21321101"],"confidence":"High","gaps":["Mechanism by which condensin II aids loading not defined","HJURP–condensin physical link not shown here"]},{"year":2012,"claim":"Dissected CATD recognition versus stabilization, distinguishing surface residues read by HJURP from buried residues that confer post-assembly stability.","evidence":"Structure-guided mutagenesis of CENP-A/HJURP surfaces, in vitro binding, in-cell incorporation","pmids":["22406139"],"confidence":"High","gaps":["How stability is transmitted to chromatin not fully resolved","Role of CENP-A/CENP-A interface in HJURP handoff unclear"]},{"year":2013,"claim":"Identified HJURP homodimerization via the C-terminal domain as required for nucleosome assembly but not for recruitment or CENP-A binding, separating assembly from targeting.","evidence":"Crystallography, gel filtration, cross-linking, separation-of-function mutants in cells","pmids":["23771058"],"confidence":"High","gaps":["How dimerization couples two CENP-A/H4 dimers into an octamer not shown","Trigger for dimer-dependent assembly unknown"]},{"year":2014,"claim":"Defined cell-cycle gating, showing CDK phosphorylation prevents premature centromere recruitment while a DNA-binding domain drives deposition once HJURP arrives.","evidence":"Phosphosite mapping, phospho-mutants, cell-cycle imaging, in vitro DNA binding","pmids":["25001279","24519934"],"confidence":"High","gaps":["Full set of relevant phosphosites incomplete","How dephosphorylation is timed to G1 not defined"]},{"year":2015,"claim":"Mapped HJURP–M18BP1 association and revealed a CENP-A-independent centromere expansion activity, broadening HJURP's recruitment interactions and functions.","evidence":"Co-IP, DT40 knockout/gene replacement with domain mutants, ectopic targeting","pmids":["26063729"],"confidence":"High","gaps":["Molecular basis of expansion activity unknown","Relationship between expansion and deposition unresolved"]},{"year":2016,"claim":"Established a physical and functional HJURP–condensin II link, showing HJURP recruits CAPH2 to drive decondensation required for CENP-A deposition.","evidence":"Condensin I/II-selective Co-IP, CAPH2 imaging, LacO decondensation assay, RNAi with CENP-A readout","pmids":["27807043"],"confidence":"High","gaps":["How decondensation promotes loading mechanistically unclear","Timing relative to Mis18-dependent recruitment not resolved"]},{"year":2018,"claim":"Extended HJURP's role to S phase, showing it cooperates with MCM2-7/MCM2 to retain parental CENP-A nucleosomes through replication.","evidence":"S-phase BioID, reciprocal Co-IP with MCM2-7, CENP-A retention assays after replication","pmids":["30293838"],"confidence":"High","gaps":["How parental CENP-A is handed back to daughter strands not shown","Coordination with G1 deposition machinery unclear"]},{"year":2019,"claim":"Resolved the stoichiometry of HJURP engagement with the Mis18 complex, showing two interchangeable HJURP repeats bind the assembled complex without dissociating it.","evidence":"Reconstitution of Mis18 complex with HJURP repeats, photo-cross-linking, mutagenesis, in-cell recruitment","pmids":["31492860"],"confidence":"High","gaps":["How two CENP-A/H4 dimers are assembled into a tetramer in vivo not directly shown","Coordination with CENP-C pathway unaddressed"]},{"year":2023,"claim":"Revealed a second layer of cell-cycle gating, showing phosphorylation blocks HJURP–CENP-C interaction and M18BP1.S competes for CENP-C to prevent ectopic metaphase assembly.","evidence":"Xenopus egg extract assembly, phospho-mutants, HJURP–CENP-C Co-IP, M18BP1.S competition","pmids":["37141119"],"confidence":"High","gaps":["Kinase responsible for the CENP-C-blocking phosphorylation not pinned down","Interplay between CENP-C and Mis18 routes not resolved here"]},{"year":2025,"claim":"Defined CENP-C and Mis18 as dual parallel recruitment pathways, showing direct HJURP–CENP-C CTD binding is required and that abolishing both pathways fully blocks CENP-A loading.","evidence":"In vitro binding, DT40 complementation with CENP-C-binding mutants, Mis18 knockout combination, chromatin Co-IP (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","How the two pathways are temporally coordinated not resolved"]},{"year":2024,"claim":"Extended HJURP beyond centromeres to DNA repair, showing PARylation-dependent recruitment to double-strand breaks where it turns over H3K9me3/HP1.","evidence":"Laser micro-irradiation, PARP-inhibitor dependency, ChIP for H3K9me3/HP1, clonogenic survival in glioma cells","pmids":["38279062"],"confidence":"Medium","gaps":["Single lab; whether chaperone activity is required at DSBs unclear","Direct partner at DSBs not identified"]},{"year":2024,"claim":"Identified a redox role, showing HJURP forms disulfide intermediates with PRDX1 to enhance its peroxidase activity and suppress ferroptosis.","evidence":"Co-IP, disulfide crosslinking, Cys327/Cys457 mutagenesis, peroxidase and ferroptosis assays in prostate 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Acts as a specific chaperone for CENPA and is required for the incorporation of newly synthesized CENPA molecules into nucleosomes at replicated centromeres. Prevents CENPA-H4 tetramerization and prevents premature DNA binding by the CENPA-H4 tetramer. 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pathway","date":"2024-07-27","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.26.605363","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":27174,"output_tokens":8470,"usd":0.104286,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17911,"output_tokens":5109,"usd":0.10864,"stage2_stop_reason":"end_turn"},"total_usd":0.212926,"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\": 2009,\n      \"finding\": \"HJURP forms a prenucleosomal complex with CENP-A, histone H4, and nucleophosmin 1, and is required for recruitment of new CENP-A into nucleosomes at replicated centromeres during G1 phase. Recognition by HJURP is mediated through the centromere targeting domain (CATD) of CENP-A.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, RNAi knockdown with centromeric CENP-A quantification, cell-cycle analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP/MS identifying complex components, RNAi loss-of-function with defined centromeric phenotype, replicated independently in companion paper (PMID:19410545)\",\n      \"pmids\": [\"19410544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HJURP is specifically found in CENP-A-containing non-nucleosomal complexes but not in H3.1- or H3.3-containing complexes, indicating specificity for CENP-A. HJURP centromeric localization is cell-cycle regulated, transiently appearing at centromeres coinciding with the window of new CENP-A deposition. HJURP downregulation causes major reduction in centromeric CENP-A and impairs deposition of newly synthesized CENP-A, causing mitotic defects.\",\n      \"method\": \"Biochemical purification of non-nucleosomal CENP-A complexes, Co-IP, RNAi knockdown, immunofluorescence, cell-cycle analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — purification of endogenous complexes, reciprocal validation, loss-of-function phenotype, independent replication in companion paper (PMID:19410544)\",\n      \"pmids\": [\"19410545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Bacterially expressed HJURP binds the CENP-A/H4 tetramer but not the H3/H4 tetramer at a stoichiometric ratio. Binding occurs through a conserved N-terminal domain of HJURP (the CENP-A binding domain, CBD), and the TLTY box within this domain is essential for HJURP–CENP-A/H4 complex formation. HJURP facilitates efficient deposition of CENP-A/H4 tetramers onto naked DNA in vitro.\",\n      \"method\": \"Bacterial expression, pull-down binding assays, in vitro chromatin deposition assay, mutational analysis of the TLTY box\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of CENP-A/H4 deposition, mutagenesis of binding domain, stoichiometric binding assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20080577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"H3K4me2 at the centromere is required for efficient HJURP recruitment and subsequent CENP-A incorporation. Specific depletion of H3K4me2 using tethered LSD1 demethylase from a synthetic human artificial chromosome caused loss of centromeric transcription and failure to recruit HJURP, leading to gradual CENP-A loss and kinetochore inactivation.\",\n      \"method\": \"Epigenetic tethering (LSD1-LacI fusion to HAC LacO array), ChIP, immunofluorescence, centromere function assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional manipulation of histone modification with defined HJURP recruitment and CENP-A incorporation readouts, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21157429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HJURP is a chromatin assembly factor sufficient to drive stable recruitment of CENP-A to a noncentromeric LacO array when fused to LacI, and an amino-terminal fragment of HJURP assembles CENP-A nucleosomes in vitro. Ectopically targeted CENP-A chromatin is sufficient to direct assembly of a functional centromere including kinetochore proteins and stable kinetochore-microtubule attachments. HJURP recruitment to endogenous centromeres requires the Mis18 complex.\",\n      \"method\": \"LacI-LacO tethering assay, in vitro chromatin assembly with recombinant N-terminal HJURP fragment, immunofluorescence, kinetochore assembly readouts (NDC80 recruitment, microtubule attachment), RNAi of Mis18 complex components\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro chromatin assembly reconstitution combined with ectopic targeting assay and functional kinetochore readouts; multiple orthogonal methods\",\n      \"pmids\": [\"21768289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of an HJURP–CENP-A–histone H4 complex shows that HJURP binds a CENP-A–H4 heterodimer. The C-terminal β-sheet domain of HJURP caps the DNA-binding region of the histone heterodimer, preventing spontaneous DNA association. A novel site in CENP-A distinguishes it from histone H3 in its ability to bind HJURP.\",\n      \"method\": \"X-ray crystallography of HJURP–CENP-A–H4 complex, structural analysis and mutagenesis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional interpretation, novel CENP-A binding site identified; single lab but structure is definitive method\",\n      \"pmids\": [\"21478274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Xenopus HJURP (xHJURP), a member of the HJURP/Scm3 family, is required for CENP-A deposition in a Xenopus egg extract system that recapitulates spatial and temporal specificity of CENP-A loading. Human HJURP can substitute for xHJURP despite little sequence homology. Condensin II (but not condensin I) is also required for CENP-A assembly and contributes to retention of centromeric CENP-A nucleosomes.\",\n      \"method\": \"Xenopus egg extract in vitro CENP-A deposition assay, immunodepletion, complementation with human HJURP, condensin I/II-selective depletion\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cell-free reconstitution system with immunodepletion and complementation; ortholog study with functional validation\",\n      \"pmids\": [\"21321101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Surface-exposed residues in the CENP-A targeting domain (CATD) are the primary sequence determinants for HJURP recognition, while buried CATD residues generating rigidity with H4 are also required for efficient centromeric incorporation. HJURP contact points adjacent to the CATD transmit stability throughout the histone fold domains of CENP-A and H4. An intact CENP-A/CENP-A interface is required for stable chromatin incorporation immediately upon HJURP-mediated assembly.\",\n      \"method\": \"Structure-guided mutagenesis of CENP-A and HJURP contact surfaces, in vitro binding assays, centromere incorporation assays in cells\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with in vitro binding and in-cell incorporation assays; mechanistic dissection of recognition vs. stabilization surfaces\",\n      \"pmids\": [\"22406139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HJURP forms a homodimer through its C-terminal domain (including the second HJURP_C domain). HJURP exists as a dimer in the soluble pre-assembly complex and at chromatin during new CENP-A deposition. Dimerization is essential for deposition of new CENP-A nucleosomes but is not required for HJURP recruitment to centromeres or CENP-A binding.\",\n      \"method\": \"Crystallographic and biochemical analysis of HJURP dimerization domain, gel filtration, cross-linking, separation-of-function mutants in cells, centromeric CENP-A quantification\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical and structural demonstration of dimerization, separation-of-function mutants distinguishing dimerization from recruitment and binding; multiple orthogonal methods\",\n      \"pmids\": [\"23771058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cell-cycle-dependent recruitment of HJURP to centromeres depends on its phosphorylation by cyclin-dependent kinases. A nonphosphorylatable HJURP mutant localizes prematurely to centromeres in S and G2 phase, causing premature CENP-A loading and cell-cycle delays. Once at centromeres, HJURP promotes CENP-A deposition through a DNA-binding domain.\",\n      \"method\": \"Phosphosite mapping, nonphosphorylatable/phosphomimetic HJURP mutants, immunofluorescence, cell-cycle analysis, in vitro DNA-binding assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-mutant functional analysis with multiple cellular readouts and in vitro DNA binding; mechanistic link between phosphorylation and centromere recruitment demonstrated\",\n      \"pmids\": [\"25001279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human HJURP directly binds Mis18β through a minimal region mapping to residues 437–460. Depletion of Mis18β by RNAi dramatically impairs HJURP recruitment to centromeres. CDK1 phosphorylation of HJURP weakens its interaction with Mis18β, linking cell-cycle regulation to CENP-A deposition timing.\",\n      \"method\": \"Co-IP, GST pulldown, domain mapping, RNAi depletion of Mis18β, CDK1 phosphorylation assay, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding mapped to specific residues, loss-of-function rescue, phosphorylation biochemistry; multiple orthogonal methods in one study\",\n      \"pmids\": [\"24519934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The middle region of HJURP associates with the Mis18 complex protein M18BP1/KNL2, and the HJURP–M18BP1 association is required for HJURP function. HJURP also exhibits a centromere expansion activity separable from its CENP-A-binding activity, demonstrated by ectopic HJURP localization inducing expansion of artificial and natural centromeres.\",\n      \"method\": \"Co-IP, DT40 knockout cell lines, gene replacement with domain mutants, ectopic HJURP localization assay, immunofluorescence of centromere size\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout complementation with separation-of-function mutants plus direct binding and ectopic targeting assays; multiple orthogonal methods\",\n      \"pmids\": [\"26063729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HJURP selectively associates with the condensin II complex (not condensin I) during G1, recruits condensin II subunit CAPH2 to centromeres at the time of CENP-A deposition, and induces decondensation of a noncentromeric LacO array. Condensin II function at the centromere is required for new CENP-A deposition in human cells.\",\n      \"method\": \"Co-IP distinguishing condensin I vs. II, immunofluorescence of CAPH2 centromere localization, LacO/LacI decondensation assay, RNAi of CAPH2, CENP-A incorporation quantification\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — selective Co-IP, ectopic assay, and functional knockdown with CENP-A deposition readout; multiple orthogonal methods\",\n      \"pmids\": [\"27807043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"During S phase, HJURP transiently associates with centromeres and binds pre-existing CENP-A, and is required for centromeric nucleosome inheritance during DNA replication. HJURP co-purifies with the MCM2-7 helicase complex and, together with the MCM2 subunit, binds CENP-A simultaneously, suggesting a mechanism for parental CENP-A retention at the replication fork.\",\n      \"method\": \"BioID proximity labeling during S phase, co-immunoprecipitation of HJURP with MCM2-7, CENP-A retention assays after replication, HJURP depletion with S-phase-specific readouts\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BioID proximity labeling plus reciprocal Co-IP plus loss-of-function with S-phase-specific CENP-A retention readout; multiple orthogonal methods\",\n      \"pmids\": [\"30293838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HJURP antagonizes ectopic CENP-A deposition driven by H3.3 chaperones HIRA and DAXX; the correct balance between HJURP and CENP-A levels is essential to preclude ectopic assembly by H3.3 chaperones.\",\n      \"method\": \"RNAi knockdown of HJURP, HIRA, and DAXX in human cancer cells; ChIP and immunofluorescence to quantify ectopic CENP-A; epistasis analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNAi epistasis with ChIP readout; single lab, limited orthogonal methods\",\n      \"pmids\": [\"30365520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Two repeats in human HJURP proposed to be functionally distinct are in fact interchangeable and bind concomitantly to the 4:2:2 Mis18α:Mis18β:M18BP1 complex without dissociating it. HJURP binds CENP-A:H4 dimers, requiring two Mis18αβ:M18BP1:HJURP complexes (or consecutive rounds by the same complex) to assemble CENP-A:H4 tetramers. Mis18α N-terminal tails blockade two identical HJURP-repeat binding sites near Mis18αβ C-terminal helices, identified by photo-cross-linking and mutated to separate Mis18 from HJURP centromere recruitment.\",\n      \"method\": \"Biochemical reconstitution of Mis18 complex with HJURP repeats, photo-cross-linking, mutational analysis, in-cell centromere recruitment assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution, photo-cross-linking, mutagenesis, and functional in-cell assays; multiple orthogonal methods in one study\",\n      \"pmids\": [\"31492860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CENP-A nucleosomes form characteristic rosette-like clusters (~250–300 nm) during G1, with HJURP located at the center of each rosette serving as a nucleation point for CENP-A assembly, as revealed by 2D/3D super-resolution microscopy.\",\n      \"method\": \"2D and 3D super-resolution microscopy (dSTORM/PALM), segmentation analysis, co-localization of HJURP and CENP-A\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — super-resolution imaging with quantitative colocalization; direct structural/localization observation but no functional perturbation to validate nucleation role\",\n      \"pmids\": [\"31570711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The yeast HJURP ortholog Scm3 acts as a cochaperone with the ATAD2 homolog Yta7 for Cse4(CENP-A) deposition; Yta7 interacts in vivo with Scm3 and increased Cse4 deposition caused by Yta7 overexpression requires Scm3 activity.\",\n      \"method\": \"Co-immunoprecipitation of Scm3 with Yta7, genetic epistasis (Yta7 OE requires Scm3), ChIP of centromeric Cse4, chromosome segregation assays in yeast\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast ortholog study; Co-IP plus genetic epistasis plus ChIP; direct relevance to mammalian HJURP function is inferred\",\n      \"pmids\": [\"32079723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The critical residues mediating CENP-A–HJURP interaction differ between chicken and human; the A59Q mutation in chicken CENP-A α1-helix causes CENP-A misincorporation and cell death, whereas the corresponding human mutation does not. W53 of chicken HJURP (a contact site for A59) is also essential. Introduction of two arginine residues to the chicken HJURP αA-helix suppresses CENP-A misincorporation, revealing species-specific affinity tuning of the CENP-A–HJURP interface.\",\n      \"method\": \"Point mutagenesis of chicken and human CENP-A and HJURP, DT40 cell complementation assays, cell viability, immunofluorescence of CENP-A incorporation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — comprehensive mutagenesis with functional in-cell rescue, species-specific structure-function dissection; multiple orthogonal methods\",\n      \"pmids\": [\"33207191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HJURP (then called FAKTS) localizes to the nucleus and interacts with 14-3-3 proteins in mammalian cells. This interaction is enhanced by activated Akt/PKB and is dependent on phosphorylation of Ser479 by AKT/PKB.\",\n      \"method\": \"Yeast two-hybrid screen, confocal microscopy, co-immunoprecipitation in mammalian cells, Akt overexpression, Ser479 mutational analysis\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP plus mutagenesis confirming Ser479 as interaction mediator; single lab but two orthogonal methods\",\n      \"pmids\": [\"17256767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HJURP knockdown in human dermal fibroblasts and endothelial cells leads to premature cellular senescence via a p53-dependent pathway; p53 knockdown, but not p16 knockdown, abolishes the senescence phenotype caused by HJURP reduction.\",\n      \"method\": \"RNAi knockdown of HJURP, ectopic HJURP overexpression in senescent cells, p53 and p16 siRNA epistasis, senescence assays (SA-β-gal, proliferation)\",\n      \"journal\": \"The journals of gerontology. Series A, Biological sciences and medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic epistasis (p53 vs p16) with clear senescence readout, but single lab, single method type\",\n      \"pmids\": [\"23292286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HJURP phosphorylation prevents its interaction with CENP-C in metaphase, blocking delivery of soluble CENP-A to centromeres. Non-phosphorylatable HJURP mutants constitutively bind CENP-C in metaphase but are insufficient alone for CENP-A assembly. M18BP1.S also binds CENP-C to competitively inhibit HJURP access to centromeres in metaphase. Removal of both inhibitory activities causes ectopic CENP-A assembly in metaphase.\",\n      \"method\": \"Cell-free Xenopus egg extract centromere assembly assay, phospho-mutant HJURP, co-immunoprecipitation of HJURP with CENP-C, M18BP1.S competition experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cell-free reconstitution system plus phospho-mutant analysis plus Co-IP; mechanistic dissection of two independent inhibitory activities\",\n      \"pmids\": [\"37141119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HJURP destabilizes p21 (CDKN1A) in hepatocellular carcinoma cells via MAPK/ERK1/2 and AKT/GSK3β pathways, promoting nucleus-to-cytoplasm translocation and ubiquitin-mediated degradation of p21. HJURP silencing effects on cell growth are reversed by p21 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for p21 stability, immunofluorescence of p21 localization, ERK1/2 inhibitor (U0126) and AKT agonist (SC-79) treatment, ubiquitination assay, genetic epistasis (HJURP KD + p21 KD)\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus pathway inhibitors plus genetic epistasis, but mechanistic link between HJURP and MAPK/AKT is not directly demonstrated; single lab\",\n      \"pmids\": [\"30111352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HJURP increases ubiquitination of CDKN1A (p21) via the GSK3β/JNK signaling pathway, decreasing its stability and promoting prostate cancer cell proliferation.\",\n      \"method\": \"Ubiquitination assay, Western blot for p21 stability, pathway inhibitor treatment, HJURP overexpression and knockdown with proliferation readouts in vitro and in vivo\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — ubiquitination assay plus pathway inhibitors; single lab, mechanism linking HJURP to GSK3β/JNK is not directly established\",\n      \"pmids\": [\"34099634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HJURP is recruited to DNA double-strand break (DSB) sites through a mechanism requiring chromatin PARylation. At DSBs, HJURP promotes turnover of H3K9me3 and HP1, facilitating DNA damage signaling and DSB repair. HJURP overexpression also reorganizes global heterochromatin structure and increases radioresistance in glioma cells.\",\n      \"method\": \"Laser micro-irradiation to induce DSBs, HJURP-GFP recruitment imaging, PARP inhibitor and PARylation dependency assays, ChIP for H3K9me3 and HP1 at DSBs, comet assay, clonogenic survival after radiation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct imaging of HJURP recruitment to DSBs plus PARylation dependency plus chromatin mark changes; single lab\",\n      \"pmids\": [\"38279062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HJURP forms disulfide-linked intermediates with PRDX1 through Cys327 and Cys457 residues, promoting PRDX1 redox cycling and inhibiting its hyperoxidation. This interaction enhances PRDX1 peroxidase activity, decreasing ROS levels and suppressing ferroptosis-inducer-induced lipid peroxidation in prostate cancer cells.\",\n      \"method\": \"Co-IP, disulfide crosslinking assays, cysteine mutagenesis (Cys327 and Cys457), in vitro peroxidase activity assay, ROS and lipid peroxidation measurements, in vitro and in vivo ferroptosis assays\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical demonstration of disulfide intermediates plus mutagenesis of specific cysteines plus in vitro enzymatic activity assay plus functional cell-based validation; multiple orthogonal methods\",\n      \"pmids\": [\"39405980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HJURP affects ubiquitination of YAP1 protein, regulating its stability and downstream transcriptional activity in triple-negative breast cancer. YAP1 in turn positively regulates NDRG1 transcription by binding its promoter, and the HJURP/YAP1/NDRG1 axis affects cell proliferation and chemotherapy sensitivity.\",\n      \"method\": \"Co-IP of HJURP and YAP1, ubiquitination assay, promoter binding (ChIP/reporter), HJURP and YAP1 knockdown epistasis, proliferation and chemosensitivity assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and ubiquitination assay with epistasis; single lab, mechanism linking HJURP to YAP1 ubiquitination is not fully established\",\n      \"pmids\": [\"35459269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NFE2L1 transcriptionally activates HJURP by binding to its promoter, as confirmed by dual luciferase reporter and chromatin immunoprecipitation assays. HJURP inhibition attenuates the proliferation and ferroptosis-suppressive effects of NFE2L1 overexpression in oral squamous cell carcinoma cells.\",\n      \"method\": \"Dual luciferase reporter assay, ChIP assay for NFE2L1 at HJURP promoter, HJURP knockdown epistasis in NFE2L1-overexpressing cells\",\n      \"journal\": \"Journal of bioenergetics and biomembranes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct promoter binding shown by ChIP and reporter assay; single lab, epistasis confirms functional dependency\",\n      \"pmids\": [\"37848756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HJURP directly binds the C-terminal domain of CENP-C in vitro, and this interaction is essential for new CENP-A incorporation in chicken DT40 cells. CENP-C and the Mis18 complex provide dual, parallel recruitment pathways for HJURP localization to centromeres; abolishing both pathways completely prevents HJURP centromere localization and CENP-A incorporation. CENP-C, HJURP, and Mis18C form a tight association in the chromatin fraction.\",\n      \"method\": \"In vitro binding assay (recombinant HJURP and CENP-C CTD), HJURP CENP-C-binding mutants in DT40 cells, Mis18C knockout combined with HJURP mutant, Co-IP of CENP-C/HJURP/Mis18C from chromatin fraction, immunofluorescence of CENP-A incorporation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding plus genetic complementation plus Co-IP; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Under sustained replication stress, ATR promotes CENP-A eviction from centromeres by recruiting the AAA+ ATPase VCP to centromeres, destabilizing CENP-A–containing nucleosomes. HJURP (but not H3 chaperones DAXX or ATRX) is necessary for subsequent nucleolar relocalization of displaced CENP-A.\",\n      \"method\": \"Replication stress induction, ATR inhibitor treatment, VCP inhibitor/depletion, immunofluorescence of CENP-A localization, HJURP/DAXX/ATRX RNAi epistasis for nucleolar CENP-A\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, epistasis for CENP-A nucleolar localization relies on RNAi, single lab, mechanism linking HJURP to nucleolar CENP-A is indirect\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"HJURP is a cell-cycle-regulated, CENP-A-specific histone chaperone that binds CENP-A/H4 heterodimers through its conserved N-terminal domain (recognizing the CATD of CENP-A), forms a homodimer through its C-terminal domain required for octameric nucleosome assembly, and is recruited to centromeres in early G1 by the Mis18α/Mis18β/M18BP1 complex (via direct HJURP repeats binding Mis18α/β) and by direct interaction with CENP-C; its centromeric recruitment is temporally gated by CDK phosphorylation that blocks Mis18β binding in S/G2/M and prevents CENP-C interaction in metaphase, while its DNA-binding domain promotes CENP-A deposition once it arrives; during S phase HJURP additionally cooperates with MCM2 to retain pre-existing CENP-A nucleosomes through replication; it recruits condensin II to facilitate chromatin decondensation for deposition; structurally, the HJURP C-terminal β-sheet domain caps the histone heterodimer DNA-binding surface to prevent premature chromatin association; and beyond centromere biology, HJURP is recruited to DNA double-strand breaks in a PARylation-dependent manner where it promotes H3K9me3/HP1 turnover to facilitate repair, forms disulfide intermediates with PRDX1 to enhance its peroxidase activity and suppress ferroptosis, and interacts with 14-3-3 proteins in an AKT/PKB-phosphorylation-dependent manner at Ser479.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HJURP is the CENP-A-specific histone chaperone that defines and propagates centromere identity by depositing newly synthesized CENP-A nucleosomes during early G1 [#0, #1]. It recognizes CENP-A through a conserved N-terminal CENP-A-binding domain that engages the CENP-A/H4 heterodimer at a CENP-A-specific surface centered on the CATD, with the TLTY box essential for complex formation and the C-terminal \\u03b2-sheet domain capping the histone DNA-binding surface to prevent premature chromatin association [#2, #5, #7]; HJURP dimerizes through its C terminus to assemble octameric CENP-A nucleosomes, an activity separable from centromere recruitment and CENP-A binding [#8]. HJURP is sufficient to build a functional de novo centromere when ectopically targeted, establishing it as the central chromatin-assembly factor of centromere inheritance [#4]. Its centromeric arrival is gated to G1 by two parallel recruitment routes\\u2014the Mis18\\u03b1/Mis18\\u03b2/M18BP1 complex, engaged through interchangeable HJURP repeats and an M18BP1 contact, and direct binding to the CENP-C C-terminal domain\\u2014both of which are required and which CDK phosphorylation suppresses outside G1 by weakening Mis18\\u03b2 binding and blocking CENP-C interaction in metaphase [#10, #11, #15, #21, #28]. Beyond deposition, HJURP recruits condensin II to drive the chromatin decondensation that accompanies CENP-A loading and, during S phase, cooperates with the MCM2-7 helicase to retain pre-existing CENP-A nucleosomes through replication [#12, #13]. Outside centromere biology, HJURP is recruited to DNA double-strand breaks in a PARylation-dependent manner where it promotes H3K9me3/HP1 turnover to facilitate repair [#24], forms disulfide intermediates with PRDX1 to enhance its peroxidase activity and suppress ferroptosis [#25], and is overexpressed in cancers where it destabilizes p21 [#22, #23].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established HJURP as the dedicated CENP-A chaperone, answering how new CENP-A is specifically deposited at centromeres during the cell cycle.\",\n      \"evidence\": \"Co-IP/MS of prenucleosomal complexes, RNAi with centromeric CENP-A quantification and cell-cycle analysis in human cells\",\n      \"pmids\": [\"19410544\", \"19410545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of CENP-A discrimination\", \"Mechanism of centromere targeting not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reconstituted the minimal deposition reaction, showing HJURP's N-terminal domain binds CENP-A/H4 selectively and deposits it onto DNA, proving direct chaperone activity.\",\n      \"evidence\": \"Bacterial expression, stoichiometric pull-downs, in vitro DNA deposition, TLTY-box mutagenesis\",\n      \"pmids\": [\"20080577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Octamer assembly versus tetramer deposition not addressed\", \"No structure of the binding interface\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked a chromatin mark to chaperone recruitment, showing centromeric H3K4me2 and transcription are needed for HJURP loading.\",\n      \"evidence\": \"LSD1 tethering to a human artificial chromosome, ChIP and centromere function assays\",\n      \"pmids\": [\"21157429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between H3K4me2 and HJURP not defined\", \"Whether transcription or the mark per se is the signal unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated HJURP is sufficient to seed a functional centromere and depends on the Mis18 complex for endogenous recruitment, defining it as the central epigenetic assembly factor.\",\n      \"evidence\": \"LacI-LacO ectopic targeting, in vitro chromatin assembly, kinetochore readouts, Mis18 RNAi\",\n      \"pmids\": [\"21768289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct HJURP\\u2013Mis18 contacts not mapped\", \"How recruitment is timed to G1 unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Solved the structural basis of CENP-A recognition, showing HJURP caps the histone DNA-binding surface and exploits a CENP-A-specific site to exclude H3.\",\n      \"evidence\": \"X-ray crystallography of HJURP\\u2013CENP-A\\u2013H4 with mutagenesis\",\n      \"pmids\": [\"21478274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not capture the dimeric assembly-competent state\", \"How capping is released for DNA loading not shown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Confirmed deposition activity is conserved and identified condensin II as a co-requirement, using a cell-free system that recapitulates loading specificity.\",\n      \"evidence\": \"Xenopus egg extract deposition, immunodepletion, human HJURP complementation, condensin-selective depletion\",\n      \"pmids\": [\"21321101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which condensin II aids loading not defined\", \"HJURP\\u2013condensin physical link not shown here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dissected CATD recognition versus stabilization, distinguishing surface residues read by HJURP from buried residues that confer post-assembly stability.\",\n      \"evidence\": \"Structure-guided mutagenesis of CENP-A/HJURP surfaces, in vitro binding, in-cell incorporation\",\n      \"pmids\": [\"22406139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How stability is transmitted to chromatin not fully resolved\", \"Role of CENP-A/CENP-A interface in HJURP handoff unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified HJURP homodimerization via the C-terminal domain as required for nucleosome assembly but not for recruitment or CENP-A binding, separating assembly from targeting.\",\n      \"evidence\": \"Crystallography, gel filtration, cross-linking, separation-of-function mutants in cells\",\n      \"pmids\": [\"23771058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How dimerization couples two CENP-A/H4 dimers into an octamer not shown\", \"Trigger for dimer-dependent assembly unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined cell-cycle gating, showing CDK phosphorylation prevents premature centromere recruitment while a DNA-binding domain drives deposition once HJURP arrives.\",\n      \"evidence\": \"Phosphosite mapping, phospho-mutants, cell-cycle imaging, in vitro DNA binding\",\n      \"pmids\": [\"25001279\", \"24519934\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of relevant phosphosites incomplete\", \"How dephosphorylation is timed to G1 not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapped HJURP\\u2013M18BP1 association and revealed a CENP-A-independent centromere expansion activity, broadening HJURP's recruitment interactions and functions.\",\n      \"evidence\": \"Co-IP, DT40 knockout/gene replacement with domain mutants, ectopic targeting\",\n      \"pmids\": [\"26063729\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of expansion activity unknown\", \"Relationship between expansion and deposition unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established a physical and functional HJURP\\u2013condensin II link, showing HJURP recruits CAPH2 to drive decondensation required for CENP-A deposition.\",\n      \"evidence\": \"Condensin I/II-selective Co-IP, CAPH2 imaging, LacO decondensation assay, RNAi with CENP-A readout\",\n      \"pmids\": [\"27807043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How decondensation promotes loading mechanistically unclear\", \"Timing relative to Mis18-dependent recruitment not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended HJURP's role to S phase, showing it cooperates with MCM2-7/MCM2 to retain parental CENP-A nucleosomes through replication.\",\n      \"evidence\": \"S-phase BioID, reciprocal Co-IP with MCM2-7, CENP-A retention assays after replication\",\n      \"pmids\": [\"30293838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How parental CENP-A is handed back to daughter strands not shown\", \"Coordination with G1 deposition machinery unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the stoichiometry of HJURP engagement with the Mis18 complex, showing two interchangeable HJURP repeats bind the assembled complex without dissociating it.\",\n      \"evidence\": \"Reconstitution of Mis18 complex with HJURP repeats, photo-cross-linking, mutagenesis, in-cell recruitment\",\n      \"pmids\": [\"31492860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How two CENP-A/H4 dimers are assembled into a tetramer in vivo not directly shown\", \"Coordination with CENP-C pathway unaddressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a second layer of cell-cycle gating, showing phosphorylation blocks HJURP\\u2013CENP-C interaction and M18BP1.S competes for CENP-C to prevent ectopic metaphase assembly.\",\n      \"evidence\": \"Xenopus egg extract assembly, phospho-mutants, HJURP\\u2013CENP-C Co-IP, M18BP1.S competition\",\n      \"pmids\": [\"37141119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for the CENP-C-blocking phosphorylation not pinned down\", \"Interplay between CENP-C and Mis18 routes not resolved here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined CENP-C and Mis18 as dual parallel recruitment pathways, showing direct HJURP\\u2013CENP-C CTD binding is required and that abolishing both pathways fully blocks CENP-A loading.\",\n      \"evidence\": \"In vitro binding, DT40 complementation with CENP-C-binding mutants, Mis18 knockout combination, chromatin Co-IP (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"How the two pathways are temporally coordinated not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended HJURP beyond centromeres to DNA repair, showing PARylation-dependent recruitment to double-strand breaks where it turns over H3K9me3/HP1.\",\n      \"evidence\": \"Laser micro-irradiation, PARP-inhibitor dependency, ChIP for H3K9me3/HP1, clonogenic survival in glioma cells\",\n      \"pmids\": [\"38279062\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; whether chaperone activity is required at DSBs unclear\", \"Direct partner at DSBs not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a redox role, showing HJURP forms disulfide intermediates with PRDX1 to enhance its peroxidase activity and suppress ferroptosis.\",\n      \"evidence\": \"Co-IP, disulfide crosslinking, Cys327/Cys457 mutagenesis, peroxidase and ferroptosis assays in prostate cancer\",\n      \"pmids\": [\"39405980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship to nuclear chaperone function unknown\", \"Whether this is cancer-specific not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HJURP's centromeric, replication-fork, DNA-repair, and redox/oncogenic activities are partitioned within a cell, and how its many recruitment routes are integrated into a single timed deposition program, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coupling centromere and non-centromere functions\", \"Kinase/phosphatase circuitry controlling timing incompletely mapped\", \"Cancer roles (p21, YAP1, ferroptosis) mechanistically separable from chaperone activity not clarified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 2, 5, 7, 8]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 19]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 1, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 9]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 4, 12]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"complexes\": [\n      \"HJURP\\u2013CENP-A\\u2013H4 prenucleosomal complex\",\n      \"Mis18 complex (Mis18\\u03b1/Mis18\\u03b2/M18BP1) co-complex\",\n      \"MCM2-7 helicase complex\"\n    ],\n    \"partners\": [\n      \"CENPA\",\n      \"H4\",\n      \"MIS18B\",\n      \"M18BP1\",\n      \"CENPC\",\n      \"MCM2\",\n      \"PRDX1\",\n      \"YWHA (14-3-3)\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}