{"gene":"MKI67","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":1991,"finding":"Ki-67 antigen was identified as a nonhistone nuclear protein forming a double band at ~395 kDa and ~345 kDa, expressed exclusively in proliferating cells but absent in quiescent cells. Antisense oligonucleotides against Ki-67 antigen inhibited proliferation of IM-9 cells, indicating Ki-67 may be an absolute requirement for maintaining cell proliferation.","method":"Immunoblot, enzymatic digestion, molecular cloning from lambda gt11 library, antisense oligonucleotide inhibition","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 1 — foundational biochemical characterization with multiple orthogonal methods, highly cited (840 citations)","pmids":["2012175"],"is_preprint":false},{"year":1993,"finding":"Full-length cDNA cloning revealed that Ki-67 antigen is encoded by two differentially spliced mRNA isoforms (9,768 bp and 8,688 bp ORFs), encoding proteins of ~358 kDa and ~319 kDa. The central region contains 16 tandemly repeated 366-bp elements ('Ki-67 repeats'), each with a conserved 66-bp 'Ki-67 motif' that encodes the epitope recognized by Ki-67 antibody. The protein has no homology to known sequences and represents a new category of cell cycle-associated nuclear nonhistone proteins.","method":"Full-length cDNA cloning and sequencing, Northern blot, bacterial expression, immunoblot with novel mAbs","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — full structural characterization with multiple orthogonal methods, highly cited (670 citations)","pmids":["8227122"],"is_preprint":false},{"year":2000,"finding":"Ki-67 protein undergoes phosphorylation by cdc2 kinase and PKC, and these posttranslational modifications accompany redistribution from the nuclear interior to the perichromosomal layer during mitosis and back during mitotic exit.","method":"Review summarizing phosphorylation evidence and relocalization data","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 — review synthesis of biochemical data from multiple studies, no new primary experiments","pmids":["10837136"],"is_preprint":false},{"year":2006,"finding":"Ki-67 protein (pKi-67) is physically associated with ribosomal RNA transcription machinery in both quiescent and proliferating cells. ChIP assays showed pKi-67 associates with chromatin of the rRNA gene promoter and transcribed region, and a fraction of pKi-67 localizes to sites linked to rRNA synthesis during interphase and mitosis.","method":"Chromatin immunoprecipitation (ChIP), immunofluorescence with novel antibody TuBB-9, colocalization with rRNA transcription sites","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 — ChIP demonstrates direct chromatin association at rRNA loci, corroborated by localization data","pmids":["16206250"],"is_preprint":false},{"year":2016,"finding":"Ki-67 acts as a biological surfactant on the mitotic chromosome surface to prevent chromosomes from aggregating into a single chromatin mass after nuclear envelope disassembly, enabling independent chromosome motility and efficient spindle interactions. Ki-67 forms a high-density surface brush at the chromosome periphery in an extended molecular conformation. The surfactant function correlates with size and net charge of the protein rather than a specific domain, suggesting a steric and electrostatic charge barrier mechanism.","method":"Fluorescence correlation spectroscopy, dual-colour labelling of protein termini, truncation mutant analysis, live-cell imaging of chromosome individualization after Ki-67 depletion","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal biophysical and genetic methods, highly cited (414 citations), published in Nature","pmids":["27362226"],"is_preprint":false},{"year":2016,"finding":"Ki-67 controls heterochromatin organisation. Ki-67 depletion disrupts nucleologenesis, alters gene expression, disrupts heterochromatin compaction and long-range genomic interactions, and relocalizes H3K9me3 and H4K20me3. Overexpression of human or Xenopus Ki-67 induces ectopic heterochromatin formation. Ki-67 interactors include nucleolar process proteins and chromatin regulators. Ki-67 mutant mice are viable and cells lacking Ki-67 proliferate efficiently, demonstrating Ki-67 is dispensable for proliferation but required for heterochromatin spatial organisation.","method":"Mouse knockout, Ki-67 overexpression in differentiated tissues, Co-IP/interactome, Hi-C chromatin interaction mapping, H3K9me3/H4K20me3 immunostaining, nucleologenesis assay, gene expression profiling","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — genetic (mouse KO), orthogonal molecular methods (ChIP, Hi-C, interactome), functional assays, replicated across species","pmids":["26949251"],"is_preprint":false},{"year":2016,"finding":"Ki-67 and RepoMan recruit protein phosphatase 1 (PP1) to chromatin at anaphase onset using an identical yet novel mechanism, binding a PP1 pocket engaged only by these two regulators. Ki-67 and RepoMan distinguish between distinct PP1 isoforms. Assembly of these holoenzymes is dynamically regulated by Aurora B kinase phosphorylation during mitosis. This defines Ki-67 as a scaffold for a mitotic exit phosphatase.","method":"Structural biology (X-ray crystallography), biochemical reconstitution, mutagenesis, in vitro binding assays, mass spectrometry, cell biology","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus biochemical reconstitution plus mutagenesis in a single study","pmids":["27572260"],"is_preprint":false},{"year":2004,"finding":"During early mouse development, Ki-67 protein shows sex-specific expression: it is present in MII oocytes but absent in mature sperm. After fertilization, both pronuclei show little or no Ki-67 until prophase of the first mitosis, when chromosomes of both pronuclei are simultaneously decorated with Ki-67. In 2-cell embryos, Ki-67 localizes preferentially to nucleolus precursor bodies (NPBs). From the 4-cell stage onwards, Ki-67 shows the regular cell-cycle-dependent nuclear relocalization pattern: perichromosomal layer during mitosis, distributed in whole nucleus in early G1, and associated with NPBs/nucleolus for the rest of the cell cycle.","method":"Immunofluorescence microscopy in mouse embryos at successive developmental stages","journal":"Cytogenetic and genome research","confidence":"Medium","confidence_rationale":"Tier 3 — single localization study, no direct functional manipulation, but provides cell-cycle-resolved localization data in a developmental context","pmids":["15237214"],"is_preprint":false},{"year":2020,"finding":"During mitotic exit, Ki-67 promotes chromosome clustering at the anaphase spindle poles by collapsing from repulsive molecular brushes to an adhesive state. This Ki-67-mediated chromosome clustering excludes large cytoplasmic components (including mature ribosomes) from the nucleus as the nuclear envelope reforms, re-establishing nuclear/cytoplasmic compartmentalization after open mitosis. Exclusion of ribosomes from the reforming nucleus depends on Ki-67-regulated chromosome clustering.","method":"Live-cell imaging in HeLa cells, Ki-67 depletion, ribosome reporter exclusion assay, microtubule-independent mechanism demonstrated","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean KD with specific mechanistic phenotypic readout, published in Nature, orthogonal assays","pmids":["32879492"],"is_preprint":false},{"year":2022,"finding":"Ki-67 associates with large late-replicating genomic domains throughout the cell cycle. Early in interphase Ki-67 (in pre-nucleolar bodies) interacts with these domains on all chromosomes; later in interphase, when Ki-67 is confined to nucleoli, it shifts toward small chromosomes. Ki-67 does not detectably control chromatin-chromatin interactions during interphase but competes with the nuclear lamina for interaction with late-replicating DNA and controls replication timing of (peri)centromeric regions.","method":"pA-DamID genomic mapping in human cell lines, nucleolar perturbation experiments, replication timing assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — genome-wide proximity mapping with functional validation of replication timing control, multiple cell lines","pmids":["36245428"],"is_preprint":false},{"year":2024,"finding":"Ki-67 plays a role during DNA replication: acute depletion causes severely delayed DNA replication, unloading of the replication machinery, DNA damage not sensed by canonical pathways (dependent on HUWE1 ligase), defects in sister chromatid cohesion, and activation of an interferon response via the cGAS/STING pathway. APEX2 proteomics identified novel Ki-67 interactors at replication forks.","method":"Doxycycline-inducible E3 ligase plus auxin-inducible degron (AID) system for rapid Ki-67 degradation in HCT116 cells, APEX2 proximity proteomics, phospho-proteomics, DNA fiber assay, cGAS/STING pathway analysis","journal":"Genome biology","confidence":"High","confidence_rationale":"Tier 1-2 — acute inducible depletion with multiple orthogonal readouts (proteomics, DNA replication assays, immune signaling), tested across multiple cell lines","pmids":["38649976"],"is_preprint":false},{"year":2012,"finding":"IRF1 represses Ki-67 gene transcription in a dose-dependent manner in renal carcinoma cells. The Ki-67 core promoter contains two functional Sp1 binding sites required for its activity; IRF1 decreases endogenous Sp1 protein levels (without affecting Sp1 mRNA), thereby suppressing Ki-67 promoter activity through interference with Sp1-dependent activation.","method":"Promoter reporter assays, site-directed mutagenesis of Sp1 sites, IRF1 overexpression, Western blot and RT-PCR for Sp1 levels","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 2 — promoter mutagenesis plus epistasis (IRF1→Sp1→Ki-67), replicated in two cell lines","pmids":["22890831"],"is_preprint":false},{"year":2023,"finding":"CCDC86 (cyclon) is a novel Ki-67-interacting protein in the chromosome periphery. CCDC86 depletion by RNAi causes partial disorganisation of the chromosome periphery with altered Ki-67 and nucleolin localisation, formation of abnormal cytoplasmic aggregates, chromosome alignment errors, altered spindle length, and increased apoptosis. CCDC86 is part of subcomplexes with nucleolin and B23/NPM1 required for spindle regulation and kinetochore-microtubule attachments.","method":"RNAi depletion, co-immunoprecipitation, fluorescence microscopy, biochemical fractionation","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP identifies interaction, RNAi shows functional consequences in mitosis","pmids":["36695333"],"is_preprint":false},{"year":2016,"finding":"Ki-67 protein is required for normal nucleolar association of heterochromatin during interphase and for formation of the perichromosomal layer (PCL), a ribonucleoprotein sheath coating condensed chromosomes during mitosis. Within the PCL, Ki-67 prevents aggregation of mitotic chromosomes.","method":"Review synthesizing functional studies including depletion experiments and localization studies (summarized mechanistic findings)","journal":"Chromosoma","confidence":"Medium","confidence_rationale":"Tier 3 — review synthesis; primary data cited elsewhere (e.g., Cuylen et al. 2016 and Sobecki et al. 2016)","pmids":["29322240"],"is_preprint":false}],"current_model":"Ki-67 (MKI67) is a large, intrinsically disordered nuclear nonhistone protein whose expression peaks in proliferating cells; it localises to the nucleolus/rRNA transcription sites during interphase (where it associates with rRNA gene chromatin via ChIP), forms a dense surfactant-like brush on the mitotic chromosome periphery that prevents chromosome aggregation and enables chromosome clustering during mitotic exit to exclude cytoplasmic ribosomes from the reforming nucleus, recruits protein phosphatase 1 (PP1) via a novel interface to form a mitotic exit phosphatase regulated by Aurora B, organises heterochromatin compaction and long-range genomic interactions (including competition with the nuclear lamina for late-replicating DNA), controls replication timing of pericentromeric regions, and is required during S phase for replication fork protection and genome stability through a HUWE1/cGAS-STING-linked pathway—while being dispensable for cell proliferation per se."},"narrative":{"teleology":[{"year":1991,"claim":"Establishing the molecular identity of the Ki-67 antigen resolved whether this widely used proliferation marker was a histone or a novel protein: it proved to be a nonhistone nuclear protein of ~395/345 kDa expressed exclusively in cycling cells, and antisense inhibition suggested a functional requirement for proliferation.","evidence":"Immunoblot, enzymatic digestion, molecular cloning, and antisense oligonucleotide inhibition in IM-9 cells","pmids":["2012175"],"confidence":"High","gaps":["Antisense approach does not distinguish direct from indirect effects on proliferation","No loss-of-function genetics performed"]},{"year":1993,"claim":"Full-length cDNA cloning revealed the domain architecture of Ki-67, identifying 16 tandem 366-bp repeats containing a conserved 66-bp motif as the antibody epitope, and establishing that the protein has no homology to any known protein family.","evidence":"cDNA cloning and sequencing, Northern blot, bacterial expression, immunoblot","pmids":["8227122"],"confidence":"High","gaps":["No structural information on the repeat region","Functional significance of the repeats undefined"]},{"year":2006,"claim":"Demonstrating that Ki-67 associates with rRNA gene chromatin via ChIP established its first direct chromatin target, linking it to ribosomal RNA transcription rather than generic chromosome packaging.","evidence":"ChIP at rRNA promoter and transcribed regions, immunofluorescence colocalization with rRNA transcription sites","pmids":["16206250"],"confidence":"High","gaps":["Whether Ki-67 directly regulates rRNA transcription rates was not tested","Mechanism of recruitment to rDNA undefined"]},{"year":2016,"claim":"Three landmark studies collectively redefined Ki-67 function: it acts as a biophysical surfactant on mitotic chromosomes preventing aggregation through size and charge rather than a specific domain; it recruits PP1 to chromatin at anaphase via a structurally resolved interface regulated by Aurora B; and mouse knockout showed it is dispensable for proliferation but required for heterochromatin spatial organization, resolving the long-standing paradox of its use as a proliferation marker.","evidence":"Fluorescence correlation spectroscopy and truncation mutants (surfactant); X-ray crystallography and biochemical reconstitution (PP1); mouse knockout with Hi-C, interactome, and heterochromatin imaging (dispensability and heterochromatin role)","pmids":["27362226","27572260","26949251"],"confidence":"High","gaps":["Structural basis of the surfactant-to-adhesive transition unresolved","Which PP1 substrates are relevant at mitotic exit not identified","How heterochromatin misorganization affects long-term fitness unclear"]},{"year":2020,"claim":"The discovery that Ki-67 switches from a repulsive brush to an adhesive state at anaphase, clustering chromosomes to exclude ribosomes from the reforming nucleus, established a direct mechanism for nuclear-cytoplasmic compartmentalization after open mitosis.","evidence":"Live-cell imaging in HeLa cells, Ki-67 depletion, ribosome reporter exclusion assay","pmids":["32879492"],"confidence":"High","gaps":["Molecular trigger for the repulsive-to-adhesive switch not defined","Whether other perichromosomal proteins contribute redundantly to ribosome exclusion not resolved"]},{"year":2022,"claim":"Genome-wide proximity mapping showed Ki-67 associates with late-replicating domains throughout the cell cycle and competes with the nuclear lamina for these genomic regions, establishing a role in replication timing control of pericentromeric regions.","evidence":"pA-DamID in human cell lines, nucleolar perturbation, replication timing assays","pmids":["36245428"],"confidence":"High","gaps":["Mechanism by which Ki-67 antagonizes lamina contacts not defined","Whether replication timing changes have phenotypic consequences unclear"]},{"year":2023,"claim":"Identification of CCDC86 as a Ki-67-interacting protein in the perichromosomal layer expanded the molecular inventory of the chromosome periphery and showed CCDC86 depletion disorganizes Ki-67 and nucleolin localization during mitosis.","evidence":"Co-immunoprecipitation, RNAi depletion, fluorescence microscopy","pmids":["36695333"],"confidence":"Medium","gaps":["Whether CCDC86 directly binds Ki-67 or requires bridging partners not determined","Reciprocal dependency (Ki-67 depletion effect on CCDC86) not fully tested"]},{"year":2024,"claim":"Acute depletion revealed a direct S-phase function: Ki-67 is required for replication fork stability, and its loss causes replication machinery unloading, HUWE1-dependent undetected DNA damage, cohesion defects, and cGAS/STING-mediated interferon activation, uncoupling Ki-67 function from its mitotic roles.","evidence":"Inducible degron-mediated acute Ki-67 degradation in HCT116 cells, APEX2 proximity proteomics, DNA fiber assays, cGAS/STING pathway analysis","pmids":["38649976"],"confidence":"High","gaps":["Direct molecular targets of Ki-67 at forks not identified","Whether replication fork protection depends on Ki-67's PP1-recruiting activity untested","Connection between cohesion defects and cGAS activation not mechanistically resolved"]},{"year":null,"claim":"Key unresolved questions include the molecular trigger for Ki-67's repulsive-to-adhesive conformational switch at anaphase, identification of the PP1 substrates relevant to mitotic exit, and the structural basis by which an intrinsically disordered protein organizes heterochromatin domains genome-wide.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of full-length Ki-67 or its repeat region","Relative contribution of surfactant versus PP1-scaffold versus heterochromatin-organizer functions to cellular fitness undefined","Whether Ki-67's replication fork role and its heterochromatin-organizing role are mechanistically linked is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[4,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,5,7]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[3,7,9]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[4,6,8,12]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,6,8]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5,9]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[9,10]}],"complexes":["Perichromosomal layer (PCL)","Ki-67–PP1 holoenzyme"],"partners":["PPP1CA","PPP1CB","CCDC86","NCL","NPM1","HUWE1","SP1"],"other_free_text":[]},"mechanistic_narrative":"Ki-67 (MKI67) is a large, intrinsically disordered nuclear nonhistone protein that functions as a multivalent organizer of chromosome surface architecture and nuclear compartmentalization during the cell cycle. During mitosis, Ki-67 forms a dense surfactant-like brush on the perichromosomal layer that prevents chromosome aggregation through steric and electrostatic repulsion, then collapses into an adhesive state at anaphase to cluster chromosomes and exclude cytoplasmic ribosomes from the reforming nucleus [PMID:27362226, PMID:32879492]. During interphase, Ki-67 localizes to nucleoli and rRNA gene chromatin, where it organizes heterochromatin spatial distribution, competes with the nuclear lamina for late-replicating genomic domains, controls pericentromeric replication timing, and is required at replication forks for fork protection and genome stability through a HUWE1/cGAS-STING-linked pathway [PMID:16206250, PMID:26949251, PMID:36245428, PMID:38649976]. Ki-67 recruits protein phosphatase 1 (PP1) to chromatin at anaphase onset via a structurally defined interface regulated by Aurora B kinase, and despite its universal use as a proliferation marker, Ki-67-null mice are viable and Ki-67-depleted cells proliferate, establishing that it is dispensable for cell division per se [PMID:27572260, PMID:26949251]."},"prefetch_data":{"uniprot":{"accession":"P46013","full_name":"Proliferation marker protein Ki-67","aliases":["Antigen identified by monoclonal antibody Ki-67","Antigen KI-67","Antigen Ki67"],"length_aa":3256,"mass_kda":358.7,"function":"Protein that associates with the surface of mitotic chromosomes and acts both as a chromosome repellent during early mitosis and chromosome attractant during late mitosis (PubMed:27362226, PubMed:32879492, PubMed:35513709, PubMed:39153474). Required to maintain individual mitotic chromosomes dispersed in the cytoplasm following nuclear envelope disassembly (PubMed:27362226). During early mitosis, relocalizes from nucleoli to the chromosome surface where it forms extended brush structures that cover a substantial fraction of the chromosome surface (PubMed:27362226). The MKI67 brush structure prevents chromosomes from collapsing into a single chromatin mass by forming a steric and electrostatic charge barrier: the protein has a high net electrical charge and acts as a surfactant, dispersing chromosomes and enabling independent chromosome motility (PubMed:27362226). During mitotic anaphase, the MKI67 brush structure collapses and MKI67 switches from a chromosome repellent to a chromosome attractant to promote chromosome clustering and facilitate the exclusion of large cytoplasmic particles from the future nuclear space (PubMed:32879492, PubMed:39153474). Mechanistically, dephosphorylation during mitotic exit and simultaneous exposure of a conserved basic patch induce the RNA-dependent formation of a liquid-like condensed phase on the chromosome surface, promoting coalescence of neighboring chromosome surfaces and clustering of chromosomes (PubMed:39153474). Binds premature ribosomal RNAs during anaphase; promoting liquid-liquid phase separation (PubMed:28935370, PubMed:39153474). Binds DNA, with a preference for supercoiled DNA and AT-rich DNA (PubMed:10878551). Does not contribute to the internal structure of mitotic chromosomes (By similarity). May play a role in chromatin organization; it is however unclear whether it plays a direct role in chromatin organization or whether it is an indirect consequence of its function in mitotic chromosome (PubMed:24867636)","subcellular_location":"Chromosome; Nucleus; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P46013/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MKI67","classification":"Not Classified","n_dependent_lines":56,"n_total_lines":1208,"dependency_fraction":0.046357615894039736},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000148773","cell_line_id":"CID000719","localizations":[{"compartment":"nucleolus_gc","grade":3},{"compartment":"chromatin","grade":2},{"compartment":"nuclear_punctae","grade":2},{"compartment":"nucleoplasm","grade":1}],"interactors":[{"gene":"H1F0","stoichiometry":10.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CSNK2A2","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HIST2H2BE;HIST1H2BB;HIST1H2BO;HIST1H2BJ","stoichiometry":0.2},{"gene":"POLR3B","stoichiometry":0.2},{"gene":"HIST1H2AJ;HIST1H2AH;HIST1H2AG;H2AFJ","stoichiometry":0.2},{"gene":"ZC3H11A","stoichiometry":0.2},{"gene":"ZNF512","stoichiometry":0.2},{"gene":"MMGT1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000719","total_profiled":1310},"omim":[{"mim_id":"621490","title":"HYPOTRICHOSIS 16; 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layer during mitotic entry and its return during mitotic exit.\",\n      \"method\": \"Biochemical analysis of phosphorylation sites and cell-cycle-dependent localization studies\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, biochemical inference from primary structure and cell biology observations; not fully reconstituted in vitro\",\n      \"pmids\": [\"10837136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ki-67 controls heterochromatin organisation: depletion disrupts nucleologenesis, alters gene expression, disrupts heterochromatin compaction and long-range genomic interactions, and delocalises H3K9me3 and H4K20me3; conversely, overexpression of human or Xenopus Ki-67 induces ectopic heterochromatin formation.\",\n      \"method\": \"Ki-67 knockdown/overexpression in mouse cells and differentiated tissues, Ki-67 mutant mice, Hi-C/chromatin organisation assays, immunofluorescence for histone modifications\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO mouse, siRNA, overexpression, genomic interaction mapping, histone modification analysis) in a single rigorous study\",\n      \"pmids\": [\"26949251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ki-67 recruits protein phosphatase 1 (PP1) to chromatin at anaphase onset to form a mitotic exit phosphatase holoenzyme; Ki-67 and RepoMan bind PP1 via an identical yet novel mechanism involving a PP1 pocket engaged only by these two regulators, and this assembly is dynamically regulated by Aurora B kinase during mitosis.\",\n      \"method\": \"Structural biology (NMR/crystallography), biochemical reconstitution, mutagenesis, cell biology assays of PP1 recruitment and Aurora B regulation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural determination combined with in vitro reconstitution and mutagenesis in a single rigorous study\",\n      \"pmids\": [\"27572260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"During mitotic exit, Ki-67 molecular brushes collapse and Ki-67 promotes chromosome clustering at spindle poles via a microtubule-independent mechanism, thereby displacing large cytoplasmic components (including mature ribosomes) before nuclear envelope reassembly and re-establishing nuclear-cytoplasmic compartmentalisation after open mitosis.\",\n      \"method\": \"Live imaging in HeLa cells, Ki-67 depletion/rescue experiments, ribosome tracking, genetic epistasis with Ki-67 mutants\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal functional experiments with live imaging, KD/rescue, and multiple orthogonal readouts in a high-impact peer-reviewed study\",\n      \"pmids\": [\"32879492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Ki-67 is required during S phase for replication fork protection and genome stability: acute Ki-67 degradation causes severe replication delay, unloading of the replication machinery, HUWE1-dependent DNA damage not sensed by canonical pathways, defects in sister chromatid cohesion, and activation of the cGAS/STING interferon response.\",\n      \"method\": \"Doxycycline-inducible E3 ligase + auxin-inducible degron for rapid Ki-67 depletion in HCT116 cells; APEX2 proteomics; phospho-proteomics; DNA replication assays; cGAS/STING pathway analysis\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — acute, homogeneous protein depletion combined with proteomics, phospho-proteomics, and multiple functional readouts in a single rigorous study\",\n      \"pmids\": [\"38649976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Ki-67 is present during all active phases of the cell cycle (G1, S, G2, and mitosis) but absent from resting G0 cells; during interphase it localises to the nucleus/nucleolus, and during mitosis it relocates to the surface of condensed chromosomes (perichromosomal layer).\",\n      \"method\": \"Immunofluorescence/immunohistochemistry across cell cycle stages, flow cytometry\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — extensively replicated across many laboratories using multiple methods; foundational localization finding\",\n      \"pmids\": [\"10653597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"During early mouse development, Ki-67 shows cell-cycle-dependent redistribution: at mitosis it coats chromosome arms as a constituent of the perichromosomal layer; in early G1 it distributes throughout the nucleus; for the rest of interphase it associates with nucleolus precursor bodies/nucleoli. Mature sperm lack Ki-67 whereas MII oocytes contain it.\",\n      \"method\": \"Immunofluorescence microscopy of mouse preimplantation embryos and gametes\",\n      \"journal\": \"Cytogenetic and genome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization by immunofluorescence across developmental stages, single study\",\n      \"pmids\": [\"15237214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Ki-67 associates with large late-replicating genomic domains; early in interphase it interacts with these domains on all chromosomes, but later is confined to nucleoli and shifts toward small chromosomes. Ki-67 competes with the nuclear lamina for interaction with late-replicating DNA and controls replication timing of (peri)centromeric regions during interphase.\",\n      \"method\": \"pA-DamID genome-wide mapping in human cell lines; nucleolar perturbation experiments; replication timing assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide mapping combined with functional perturbations and multiple orthogonal readouts in a single study\",\n      \"pmids\": [\"36245428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CCDC86 (cyclon) is a novel Ki-67-interacting protein at the chromosome periphery; depletion of CCDC86 partially disorganises the chromosome periphery with altered Ki-67 and nucleolin localisation, causes chromosome alignment errors, altered spindle length, and increased apoptosis, indicating CCDC86 functions within a Ki-67-containing subcomplex required for mitotic spindle regulation and chromosome segregation.\",\n      \"method\": \"Co-immunoprecipitation, RNA interference, live and fixed-cell microscopy, biochemical fractionation in human cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — reciprocal interaction confirmed and functional KD phenotypes characterised, single study\",\n      \"pmids\": [\"36695333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IRF1 represses Ki-67 gene transcription in a dose-dependent manner by decreasing endogenous Sp1 protein levels (without affecting Sp1 mRNA), thereby interfering with Sp1-dependent activation of the Ki-67 core promoter which contains two functional Sp1 binding sites.\",\n      \"method\": \"Promoter reporter assays, site-directed mutagenesis of Sp1 sites, IRF1 overexpression, Western blot and RT-PCR for Sp1 in renal carcinoma cells\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter mutagenesis combined with overexpression and protein-level analysis, single lab\",\n      \"pmids\": [\"22890831\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Ki-67 (MKI67) is a large intrinsically disordered nuclear protein that: (1) forms repulsive molecular brushes on the perichromosomal layer during prometaphase to individualise chromosomes, then collapses to promote microtubule-independent chromosome clustering at anaphase to exclude cytoplasmic ribosomes before nuclear envelope re-formation; (2) recruits PP1 via a novel binding mechanism to form a mitotic exit phosphatase holoenzyme regulated by Aurora B; (3) organises heterochromatin and nucleolar-associated domains during interphase, controlling gene expression; (4) dynamically associates with late-replicating genomic regions and competes with the nuclear lamina for these domains; and (5) is required during S phase for replication fork protection and genome stability, with its loss triggering HUWE1-dependent DNA damage and cGAS/STING-mediated interferon signalling.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1991,\n      \"finding\": \"Ki-67 antigen was identified as a nonhistone nuclear protein forming a double band at ~395 kDa and ~345 kDa, expressed exclusively in proliferating cells but absent in quiescent cells. Antisense oligonucleotides against Ki-67 antigen inhibited proliferation of IM-9 cells, indicating Ki-67 may be an absolute requirement for maintaining cell proliferation.\",\n      \"method\": \"Immunoblot, enzymatic digestion, molecular cloning from lambda gt11 library, antisense oligonucleotide inhibition\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — foundational biochemical characterization with multiple orthogonal methods, highly cited (840 citations)\",\n      \"pmids\": [\"2012175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Full-length cDNA cloning revealed that Ki-67 antigen is encoded by two differentially spliced mRNA isoforms (9,768 bp and 8,688 bp ORFs), encoding proteins of ~358 kDa and ~319 kDa. The central region contains 16 tandemly repeated 366-bp elements ('Ki-67 repeats'), each with a conserved 66-bp 'Ki-67 motif' that encodes the epitope recognized by Ki-67 antibody. The protein has no homology to known sequences and represents a new category of cell cycle-associated nuclear nonhistone proteins.\",\n      \"method\": \"Full-length cDNA cloning and sequencing, Northern blot, bacterial expression, immunoblot with novel mAbs\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — full structural characterization with multiple orthogonal methods, highly cited (670 citations)\",\n      \"pmids\": [\"8227122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Ki-67 protein undergoes phosphorylation by cdc2 kinase and PKC, and these posttranslational modifications accompany redistribution from the nuclear interior to the perichromosomal layer during mitosis and back during mitotic exit.\",\n      \"method\": \"Review summarizing phosphorylation evidence and relocalization data\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review synthesis of biochemical data from multiple studies, no new primary experiments\",\n      \"pmids\": [\"10837136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Ki-67 protein (pKi-67) is physically associated with ribosomal RNA transcription machinery in both quiescent and proliferating cells. ChIP assays showed pKi-67 associates with chromatin of the rRNA gene promoter and transcribed region, and a fraction of pKi-67 localizes to sites linked to rRNA synthesis during interphase and mitosis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), immunofluorescence with novel antibody TuBB-9, colocalization with rRNA transcription sites\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrates direct chromatin association at rRNA loci, corroborated by localization data\",\n      \"pmids\": [\"16206250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ki-67 acts as a biological surfactant on the mitotic chromosome surface to prevent chromosomes from aggregating into a single chromatin mass after nuclear envelope disassembly, enabling independent chromosome motility and efficient spindle interactions. Ki-67 forms a high-density surface brush at the chromosome periphery in an extended molecular conformation. The surfactant function correlates with size and net charge of the protein rather than a specific domain, suggesting a steric and electrostatic charge barrier mechanism.\",\n      \"method\": \"Fluorescence correlation spectroscopy, dual-colour labelling of protein termini, truncation mutant analysis, live-cell imaging of chromosome individualization after Ki-67 depletion\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal biophysical and genetic methods, highly cited (414 citations), published in Nature\",\n      \"pmids\": [\"27362226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ki-67 controls heterochromatin organisation. Ki-67 depletion disrupts nucleologenesis, alters gene expression, disrupts heterochromatin compaction and long-range genomic interactions, and relocalizes H3K9me3 and H4K20me3. Overexpression of human or Xenopus Ki-67 induces ectopic heterochromatin formation. Ki-67 interactors include nucleolar process proteins and chromatin regulators. Ki-67 mutant mice are viable and cells lacking Ki-67 proliferate efficiently, demonstrating Ki-67 is dispensable for proliferation but required for heterochromatin spatial organisation.\",\n      \"method\": \"Mouse knockout, Ki-67 overexpression in differentiated tissues, Co-IP/interactome, Hi-C chromatin interaction mapping, H3K9me3/H4K20me3 immunostaining, nucleologenesis assay, gene expression profiling\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic (mouse KO), orthogonal molecular methods (ChIP, Hi-C, interactome), functional assays, replicated across species\",\n      \"pmids\": [\"26949251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ki-67 and RepoMan recruit protein phosphatase 1 (PP1) to chromatin at anaphase onset using an identical yet novel mechanism, binding a PP1 pocket engaged only by these two regulators. Ki-67 and RepoMan distinguish between distinct PP1 isoforms. Assembly of these holoenzymes is dynamically regulated by Aurora B kinase phosphorylation during mitosis. This defines Ki-67 as a scaffold for a mitotic exit phosphatase.\",\n      \"method\": \"Structural biology (X-ray crystallography), biochemical reconstitution, mutagenesis, in vitro binding assays, mass spectrometry, cell biology\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus biochemical reconstitution plus mutagenesis in a single study\",\n      \"pmids\": [\"27572260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"During early mouse development, Ki-67 protein shows sex-specific expression: it is present in MII oocytes but absent in mature sperm. After fertilization, both pronuclei show little or no Ki-67 until prophase of the first mitosis, when chromosomes of both pronuclei are simultaneously decorated with Ki-67. In 2-cell embryos, Ki-67 localizes preferentially to nucleolus precursor bodies (NPBs). From the 4-cell stage onwards, Ki-67 shows the regular cell-cycle-dependent nuclear relocalization pattern: perichromosomal layer during mitosis, distributed in whole nucleus in early G1, and associated with NPBs/nucleolus for the rest of the cell cycle.\",\n      \"method\": \"Immunofluorescence microscopy in mouse embryos at successive developmental stages\",\n      \"journal\": \"Cytogenetic and genome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single localization study, no direct functional manipulation, but provides cell-cycle-resolved localization data in a developmental context\",\n      \"pmids\": [\"15237214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"During mitotic exit, Ki-67 promotes chromosome clustering at the anaphase spindle poles by collapsing from repulsive molecular brushes to an adhesive state. This Ki-67-mediated chromosome clustering excludes large cytoplasmic components (including mature ribosomes) from the nucleus as the nuclear envelope reforms, re-establishing nuclear/cytoplasmic compartmentalization after open mitosis. Exclusion of ribosomes from the reforming nucleus depends on Ki-67-regulated chromosome clustering.\",\n      \"method\": \"Live-cell imaging in HeLa cells, Ki-67 depletion, ribosome reporter exclusion assay, microtubule-independent mechanism demonstrated\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with specific mechanistic phenotypic readout, published in Nature, orthogonal assays\",\n      \"pmids\": [\"32879492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Ki-67 associates with large late-replicating genomic domains throughout the cell cycle. Early in interphase Ki-67 (in pre-nucleolar bodies) interacts with these domains on all chromosomes; later in interphase, when Ki-67 is confined to nucleoli, it shifts toward small chromosomes. Ki-67 does not detectably control chromatin-chromatin interactions during interphase but competes with the nuclear lamina for interaction with late-replicating DNA and controls replication timing of (peri)centromeric regions.\",\n      \"method\": \"pA-DamID genomic mapping in human cell lines, nucleolar perturbation experiments, replication timing assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide proximity mapping with functional validation of replication timing control, multiple cell lines\",\n      \"pmids\": [\"36245428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Ki-67 plays a role during DNA replication: acute depletion causes severely delayed DNA replication, unloading of the replication machinery, DNA damage not sensed by canonical pathways (dependent on HUWE1 ligase), defects in sister chromatid cohesion, and activation of an interferon response via the cGAS/STING pathway. APEX2 proteomics identified novel Ki-67 interactors at replication forks.\",\n      \"method\": \"Doxycycline-inducible E3 ligase plus auxin-inducible degron (AID) system for rapid Ki-67 degradation in HCT116 cells, APEX2 proximity proteomics, phospho-proteomics, DNA fiber assay, cGAS/STING pathway analysis\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — acute inducible depletion with multiple orthogonal readouts (proteomics, DNA replication assays, immune signaling), tested across multiple cell lines\",\n      \"pmids\": [\"38649976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IRF1 represses Ki-67 gene transcription in a dose-dependent manner in renal carcinoma cells. The Ki-67 core promoter contains two functional Sp1 binding sites required for its activity; IRF1 decreases endogenous Sp1 protein levels (without affecting Sp1 mRNA), thereby suppressing Ki-67 promoter activity through interference with Sp1-dependent activation.\",\n      \"method\": \"Promoter reporter assays, site-directed mutagenesis of Sp1 sites, IRF1 overexpression, Western blot and RT-PCR for Sp1 levels\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter mutagenesis plus epistasis (IRF1→Sp1→Ki-67), replicated in two cell lines\",\n      \"pmids\": [\"22890831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CCDC86 (cyclon) is a novel Ki-67-interacting protein in the chromosome periphery. CCDC86 depletion by RNAi causes partial disorganisation of the chromosome periphery with altered Ki-67 and nucleolin localisation, formation of abnormal cytoplasmic aggregates, chromosome alignment errors, altered spindle length, and increased apoptosis. CCDC86 is part of subcomplexes with nucleolin and B23/NPM1 required for spindle regulation and kinetochore-microtubule attachments.\",\n      \"method\": \"RNAi depletion, co-immunoprecipitation, fluorescence microscopy, biochemical fractionation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP identifies interaction, RNAi shows functional consequences in mitosis\",\n      \"pmids\": [\"36695333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ki-67 protein is required for normal nucleolar association of heterochromatin during interphase and for formation of the perichromosomal layer (PCL), a ribonucleoprotein sheath coating condensed chromosomes during mitosis. Within the PCL, Ki-67 prevents aggregation of mitotic chromosomes.\",\n      \"method\": \"Review synthesizing functional studies including depletion experiments and localization studies (summarized mechanistic findings)\",\n      \"journal\": \"Chromosoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review synthesis; primary data cited elsewhere (e.g., Cuylen et al. 2016 and Sobecki et al. 2016)\",\n      \"pmids\": [\"29322240\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Ki-67 (MKI67) is a large, intrinsically disordered nuclear nonhistone protein whose expression peaks in proliferating cells; it localises to the nucleolus/rRNA transcription sites during interphase (where it associates with rRNA gene chromatin via ChIP), forms a dense surfactant-like brush on the mitotic chromosome periphery that prevents chromosome aggregation and enables chromosome clustering during mitotic exit to exclude cytoplasmic ribosomes from the reforming nucleus, recruits protein phosphatase 1 (PP1) via a novel interface to form a mitotic exit phosphatase regulated by Aurora B, organises heterochromatin compaction and long-range genomic interactions (including competition with the nuclear lamina for late-replicating DNA), controls replication timing of pericentromeric regions, and is required during S phase for replication fork protection and genome stability through a HUWE1/cGAS-STING-linked pathway—while being dispensable for cell proliferation per se.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Ki-67 (MKI67) is a large, intrinsically disordered nuclear protein that acts as a multifunctional chromatin organizer across the cell cycle, linking chromosome surface architecture during mitosis with heterochromatin organization and replication fork protection during interphase. Present in all active cell cycle phases but absent from G0, Ki-67 coats condensed chromosomes as a perichromosomal layer constituent during mitosis, where it forms repulsive molecular brushes that individualize chromosomes; at anaphase onset it collapses to drive microtubule-independent chromosome clustering, thereby excluding cytoplasmic ribosomes before nuclear envelope reassembly [PMID:32879492, PMID:10653597]. Ki-67 recruits protein phosphatase 1 (PP1) to chromatin via a structurally characterized binding mode shared with RepoMan and regulated by Aurora B kinase, forming a mitotic exit phosphatase holoenzyme [PMID:27572260], and during interphase it organizes heterochromatin and nucleolar-associated domains, controlling gene expression, histone modification patterns, and long-range genomic interactions while competing with the nuclear lamina for association with late-replicating genomic regions [PMID:26949251, PMID:36245428]. Ki-67 is also required during S phase for replication fork protection and genome stability, as its acute depletion causes replication delay, HUWE1-dependent DNA damage, sister chromatid cohesion defects, and activation of cGAS/STING-mediated interferon signaling [PMID:38649976].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing the basic cell-cycle-dependent behavior of Ki-67 — its presence in all active phases (G1/S/G2/M) but absence from G0, and its dynamic redistribution from nucleus/nucleolus in interphase to the perichromosomal layer in mitosis — provided the foundational framework for understanding its functions.\",\n      \"evidence\": \"Immunofluorescence, immunohistochemistry, and flow cytometry across cell cycle stages in human and mouse cells\",\n      \"pmids\": [\"10653597\", \"10837136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The functional significance of perichromosomal coating was unknown\",\n        \"No mechanistic explanation for the nucleolar-to-chromosome redistribution\",\n        \"Whether Ki-67 localization changes are driven by phosphorylation or other cues was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating Ki-67's conserved cell-cycle-dependent redistribution in early mouse embryos (and its presence in oocytes but absence from sperm) extended the foundational localization model to a developmental context.\",\n      \"evidence\": \"Immunofluorescence microscopy of mouse preimplantation embryos and gametes\",\n      \"pmids\": [\"15237214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single descriptive study without functional perturbation\",\n        \"Whether Ki-67 plays an active role in early embryonic chromatin organization was untested\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Two landmark studies revealed that Ki-67 has dual mechanistic roles: it organizes heterochromatin and nucleolar-associated domains during interphase (controlling gene expression and long-range genomic interactions), and it recruits PP1 to chromatin at anaphase onset via a structurally novel binding pocket regulated by Aurora B kinase, forming a mitotic exit phosphatase holoenzyme.\",\n      \"evidence\": \"Ki-67 knockdown/overexpression/KO mice combined with Hi-C, histone modification analysis, and structural biology (NMR/crystallography) with biochemical reconstitution and mutagenesis\",\n      \"pmids\": [\"26949251\", \"27572260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How heterochromatin organization by Ki-67 is coordinated with its mitotic functions was unclear\",\n        \"The in vivo consequences of disrupting the Ki-67–PP1 interaction specifically were not fully characterized\",\n        \"Whether Ki-67 has additional interphase roles beyond heterochromatin was unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolving the biophysical mechanism of chromosome individualization and post-mitotic compartmentalization: Ki-67 molecular brushes collapse at mitotic exit to cluster chromosomes in a microtubule-independent manner, physically excluding ribosomes before nuclear envelope reassembly.\",\n      \"evidence\": \"Live imaging, Ki-67 depletion/rescue, ribosome tracking, and genetic epistasis in HeLa cells\",\n      \"pmids\": [\"32879492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The molecular trigger for brush collapse is not fully defined beyond correlating with dephosphorylation\",\n        \"Whether ribosome exclusion is the sole purpose of chromosome clustering or serves additional functions\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Genome-wide mapping revealed that Ki-67 dynamically associates with late-replicating genomic domains and competes with the nuclear lamina for these regions, establishing Ki-67 as a regulator of replication timing at pericentromeric regions during interphase.\",\n      \"evidence\": \"pA-DamID genome-wide mapping, nucleolar perturbation, and replication timing assays in human cell lines\",\n      \"pmids\": [\"36245428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The mechanism by which Ki-67 competes with the lamina is not structurally resolved\",\n        \"Whether replication timing changes upon Ki-67 loss cause downstream genomic instability was not addressed\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of CCDC86 as a novel Ki-67-interacting protein at the chromosome periphery revealed a perichromosomal subcomplex required for proper chromosome alignment and spindle regulation during mitosis.\",\n      \"evidence\": \"Co-immunoprecipitation, RNAi, live and fixed-cell microscopy in human cells\",\n      \"pmids\": [\"36695333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The stoichiometry and full composition of the Ki-67–CCDC86 subcomplex are undefined\",\n        \"Whether CCDC86 depletion phenotypes are entirely Ki-67-dependent or involve other partners\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Acute Ki-67 degradation during S phase uncovered a previously unsuspected role in replication fork protection: Ki-67 loss causes replication delay, unloading of replication machinery, HUWE1-dependent DNA damage, cohesion defects, and activation of the cGAS/STING interferon pathway, connecting Ki-67 directly to genome stability and innate immune signaling.\",\n      \"evidence\": \"Inducible degron system for rapid Ki-67 depletion in HCT116 cells; APEX2 and phospho-proteomics; DNA replication and cGAS/STING assays\",\n      \"pmids\": [\"38649976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The direct molecular mechanism by which Ki-67 stabilizes replication forks is not identified\",\n        \"Whether the cGAS/STING activation reflects cytosolic DNA from fork collapse or another mechanism\",\n        \"How HUWE1 is specifically engaged upon Ki-67 loss remains unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how Ki-67's multiple interphase functions (heterochromatin organization, lamina competition, replication fork protection) are coordinated, whether they depend on distinct protein domains or interaction partners, and what the in vivo physiological consequences of Ki-67 loss are in adult tissues beyond early development.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No domain-resolution structure-function map linking specific Ki-67 regions to its distinct interphase roles\",\n        \"Adult conditional knockout phenotypes in mammals have not been comprehensively characterized\",\n        \"The relationship between Ki-67's replication fork role and its heterochromatin/lamina competition functions is unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [3, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 1, 7]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [5, 6, 7]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 3, 5, 6, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 2, 3, 5]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [4, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\n      \"Ki-67–PP1 mitotic exit phosphatase holoenzyme\",\n      \"Ki-67–CCDC86 perichromosomal subcomplex\"\n    ],\n    \"partners\": [\n      \"PPP1CA\",\n      \"CCDC86\",\n      \"HUWE1\",\n      \"NCL\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Ki-67 (MKI67) is a large, intrinsically disordered nuclear nonhistone protein that functions as a multivalent organizer of chromosome surface architecture and nuclear compartmentalization during the cell cycle. During mitosis, Ki-67 forms a dense surfactant-like brush on the perichromosomal layer that prevents chromosome aggregation through steric and electrostatic repulsion, then collapses into an adhesive state at anaphase to cluster chromosomes and exclude cytoplasmic ribosomes from the reforming nucleus [PMID:27362226, PMID:32879492]. During interphase, Ki-67 localizes to nucleoli and rRNA gene chromatin, where it organizes heterochromatin spatial distribution, competes with the nuclear lamina for late-replicating genomic domains, controls pericentromeric replication timing, and is required at replication forks for fork protection and genome stability through a HUWE1/cGAS-STING-linked pathway [PMID:16206250, PMID:26949251, PMID:36245428, PMID:38649976]. Ki-67 recruits protein phosphatase 1 (PP1) to chromatin at anaphase onset via a structurally defined interface regulated by Aurora B kinase, and despite its universal use as a proliferation marker, Ki-67-null mice are viable and Ki-67-depleted cells proliferate, establishing that it is dispensable for cell division per se [PMID:27572260, PMID:26949251].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing the molecular identity of the Ki-67 antigen resolved whether this widely used proliferation marker was a histone or a novel protein: it proved to be a nonhistone nuclear protein of ~395/345 kDa expressed exclusively in cycling cells, and antisense inhibition suggested a functional requirement for proliferation.\",\n      \"evidence\": \"Immunoblot, enzymatic digestion, molecular cloning, and antisense oligonucleotide inhibition in IM-9 cells\",\n      \"pmids\": [\"2012175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Antisense approach does not distinguish direct from indirect effects on proliferation\", \"No loss-of-function genetics performed\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Full-length cDNA cloning revealed the domain architecture of Ki-67, identifying 16 tandem 366-bp repeats containing a conserved 66-bp motif as the antibody epitope, and establishing that the protein has no homology to any known protein family.\",\n      \"evidence\": \"cDNA cloning and sequencing, Northern blot, bacterial expression, immunoblot\",\n      \"pmids\": [\"8227122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural information on the repeat region\", \"Functional significance of the repeats undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that Ki-67 associates with rRNA gene chromatin via ChIP established its first direct chromatin target, linking it to ribosomal RNA transcription rather than generic chromosome packaging.\",\n      \"evidence\": \"ChIP at rRNA promoter and transcribed regions, immunofluorescence colocalization with rRNA transcription sites\",\n      \"pmids\": [\"16206250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ki-67 directly regulates rRNA transcription rates was not tested\", \"Mechanism of recruitment to rDNA undefined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Three landmark studies collectively redefined Ki-67 function: it acts as a biophysical surfactant on mitotic chromosomes preventing aggregation through size and charge rather than a specific domain; it recruits PP1 to chromatin at anaphase via a structurally resolved interface regulated by Aurora B; and mouse knockout showed it is dispensable for proliferation but required for heterochromatin spatial organization, resolving the long-standing paradox of its use as a proliferation marker.\",\n      \"evidence\": \"Fluorescence correlation spectroscopy and truncation mutants (surfactant); X-ray crystallography and biochemical reconstitution (PP1); mouse knockout with Hi-C, interactome, and heterochromatin imaging (dispensability and heterochromatin role)\",\n      \"pmids\": [\"27362226\", \"27572260\", \"26949251\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the surfactant-to-adhesive transition unresolved\", \"Which PP1 substrates are relevant at mitotic exit not identified\", \"How heterochromatin misorganization affects long-term fitness unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The discovery that Ki-67 switches from a repulsive brush to an adhesive state at anaphase, clustering chromosomes to exclude ribosomes from the reforming nucleus, established a direct mechanism for nuclear-cytoplasmic compartmentalization after open mitosis.\",\n      \"evidence\": \"Live-cell imaging in HeLa cells, Ki-67 depletion, ribosome reporter exclusion assay\",\n      \"pmids\": [\"32879492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular trigger for the repulsive-to-adhesive switch not defined\", \"Whether other perichromosomal proteins contribute redundantly to ribosome exclusion not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Genome-wide proximity mapping showed Ki-67 associates with late-replicating domains throughout the cell cycle and competes with the nuclear lamina for these genomic regions, establishing a role in replication timing control of pericentromeric regions.\",\n      \"evidence\": \"pA-DamID in human cell lines, nucleolar perturbation, replication timing assays\",\n      \"pmids\": [\"36245428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Ki-67 antagonizes lamina contacts not defined\", \"Whether replication timing changes have phenotypic consequences unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of CCDC86 as a Ki-67-interacting protein in the perichromosomal layer expanded the molecular inventory of the chromosome periphery and showed CCDC86 depletion disorganizes Ki-67 and nucleolin localization during mitosis.\",\n      \"evidence\": \"Co-immunoprecipitation, RNAi depletion, fluorescence microscopy\",\n      \"pmids\": [\"36695333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CCDC86 directly binds Ki-67 or requires bridging partners not determined\", \"Reciprocal dependency (Ki-67 depletion effect on CCDC86) not fully tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Acute depletion revealed a direct S-phase function: Ki-67 is required for replication fork stability, and its loss causes replication machinery unloading, HUWE1-dependent undetected DNA damage, cohesion defects, and cGAS/STING-mediated interferon activation, uncoupling Ki-67 function from its mitotic roles.\",\n      \"evidence\": \"Inducible degron-mediated acute Ki-67 degradation in HCT116 cells, APEX2 proximity proteomics, DNA fiber assays, cGAS/STING pathway analysis\",\n      \"pmids\": [\"38649976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular targets of Ki-67 at forks not identified\", \"Whether replication fork protection depends on Ki-67's PP1-recruiting activity untested\", \"Connection between cohesion defects and cGAS activation not mechanistically resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the molecular trigger for Ki-67's repulsive-to-adhesive conformational switch at anaphase, identification of the PP1 substrates relevant to mitotic exit, and the structural basis by which an intrinsically disordered protein organizes heterochromatin domains genome-wide.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of full-length Ki-67 or its repeat region\", \"Relative contribution of surfactant versus PP1-scaffold versus heterochromatin-organizer functions to cellular fitness undefined\", \"Whether Ki-67's replication fork role and its heterochromatin-organizing role are mechanistically linked is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 5, 7]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [3, 7, 9]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [4, 6, 8, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 6, 8]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5, 9]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [9, 10]}\n    ],\n    \"complexes\": [\n      \"Perichromosomal layer (PCL)\",\n      \"Ki-67–PP1 holoenzyme\"\n    ],\n    \"partners\": [\n      \"PPP1CA\",\n      \"PPP1CB\",\n      \"CCDC86\",\n      \"NCL\",\n      \"NPM1\",\n      \"HUWE1\",\n      \"SP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}