{"gene":"CENPC","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":1992,"finding":"CENP-C is a component of the human inner kinetochore plate, as established by immunoelectron microscopy using antibodies raised to cDNA-encoded fusion proteins.","method":"Immunoelectron microscopy, immunoblotting, indirect immunofluorescence","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 — original identification with multiple orthogonal methods, foundational paper >300 citations","pmids":["1339310"],"is_preprint":false},{"year":1994,"finding":"CENP-C is required for maintaining proper kinetochore size and for a timely transition to anaphase; nuclear microinjection of anti-CENP-C antibodies during interphase causes metaphase arrest, reduces CENP-C at centromeres, and results in kinetochores of reduced diameter that fail to bind microtubules.","method":"Nuclear microinjection of antibodies, indirect immunofluorescence, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — functional antibody injection with EM phenotype, foundational study >175 citations","pmids":["8175879"],"is_preprint":false},{"year":1994,"finding":"CENP-C is a DNA-binding protein; recombinant human CENP-C binds DNA in vitro through an internal ~101-amino acid domain with no homology to known DNA-binding proteins.","method":"South-Western blotting, truncation analysis, recombinant protein expression","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro biochemical assay, single lab","pmids":["7883764"],"is_preprint":false},{"year":1995,"finding":"CENP-C is selectively present at active centromeres but absent from inactive centromeres of dicentric chromosomes, establishing it as a necessary component of functional centromeres.","method":"Immunofluorescence with specific antibodies on dicentric chromosomes, simultaneous FISH","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — replicated across multiple dicentric chromosomes and independent labs","pmids":["8634687","7757082"],"is_preprint":false},{"year":1995,"finding":"The yeast CENP-C ortholog Mif2 functions at the centromere and genetically interacts with CEP1/CBF1, NDC10/CBF2, and CEP3/CBF3B centromere protein genes; two regions of homology between Mif2 and CENP-C are identified, and temperature-sensitive mif2 mutations map within these conserved regions.","method":"Genetic epistasis, synthetic lethality screens, suppressor analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic interactions in yeast, replicated, >350 citations","pmids":["7579695"],"is_preprint":false},{"year":1996,"finding":"CENP-C contains an autonomous centromere-targeting domain in its central region that overlaps with its DNA-binding domain; mutations in the Mif2 homology domain impair kinetochore assembly.","method":"In vivo truncation/expression analysis of GFP-tagged constructs, in vitro DNA-binding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — combined in vivo and in vitro domain mapping, >100 citations","pmids":["8668174"],"is_preprint":false},{"year":1996,"finding":"CENP-C interacts in vitro and in vivo with nucleolar transcription factors UBF1 and UBF2 (NOR-90) through the carboxyl-terminal third of CENP-C; a subset of CENP-C and UBF co-localizes at nucleoli in interphase HeLa cells.","method":"Affinity chromatography, microsequencing, co-immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — affinity pulldown with microsequence confirmation and co-localization, single lab","pmids":["8702533"],"is_preprint":false},{"year":1997,"finding":"Human CENP-C has three functional domains: a putative N-terminal oligomerization domain, an internal DNA-binding domain (with 'core' and 'stabilizing' elements), and a C-terminal dimerization domain; the C-terminus forms dimers in the native state.","method":"In vitro DNA-binding assay (South-Western), chemical cross-linking, gel filtration","journal":"Chromosome research","confidence":"Medium","confidence_rationale":"Tier 1 — multiple in vitro biochemical methods, single lab","pmids":["9146917"],"is_preprint":false},{"year":1998,"finding":"CENP-C interacts with HDaxx (human Daxx) in an interphase-specific manner; the interaction is mediated by the N-terminal 315 amino acids of CENP-C and the C-terminal 104 amino acids of HDaxx, with co-localization at discrete nuclear spots in interphase.","method":"Yeast interaction trap, co-immunofluorescence","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2-3 — yeast two-hybrid confirmed by co-localization, single lab","pmids":["9645950"],"is_preprint":false},{"year":1999,"finding":"CENP-C is necessary for centromere complex assembly; loss of CENP-C from centromeres in chicken DT40 cells disassembles the centromere protein complex and blocks cells at the metaphase-anaphase junction.","method":"Conditional gene disruption in DT40 cells, immunofluorescence","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with defined cellular phenotype","pmids":["10428958"],"is_preprint":false},{"year":1999,"finding":"HSV-1 immediate-early protein Vmw110 (ICP0) causes proteasome-dependent loss of CENP-C from centromeres via its RING finger domain, resulting in substantial ultrastructural changes in the kinetochore and mitotic arrest or aberrant cytokinesis.","method":"Viral infection assays, immunofluorescence, electron microscopy, proteasome inhibitor treatment","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods showing CENP-C destruction mechanism","pmids":["10075924"],"is_preprint":false},{"year":2001,"finding":"CENP-H is required for centromere targeting of CENP-C but not CENP-A in vertebrate cells, placing CENP-H upstream of CENP-C in a hierarchical centromere assembly pathway.","method":"Conditional knockout in DT40 cells, immunocytochemistry","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — epistasis via conditional KO with specific localization phenotype","pmids":["11500386"],"is_preprint":false},{"year":2001,"finding":"C. elegans HCP-4 (CENP-C ortholog) is required for sister centromere resolution and kinetochore formation; HCP-4 localization depends on the centromeric histone HCP-3, and HCP-4 is in turn required for localization of the CENP-F-like protein HCP-1, establishing an ordered assembly pathway.","method":"RNAi, immunofluorescence, localization epistasis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — epistasis via RNAi with multiple localization readouts","pmids":["11402064"],"is_preprint":false},{"year":2001,"finding":"Temperature-sensitive CENP-C mutants in DT40 cells cause metaphase delay and chromosome missegregation; SUMO-1 overexpression suppresses the temperature-sensitive phenotype, implicating SUMO-1 in centromere function.","method":"Gene targeting in DT40 cells, cDNA library suppressor screen, temperature-shift experiments","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — suppressor screen in vertebrate cells, single lab","pmids":["11557811"],"is_preprint":false},{"year":2002,"finding":"CENP-C binds alpha-satellite DNA selectively in vivo; the region between amino acids 410 and 537 is required for in vivo DNA binding, and CENP-C and CENP-B associate with the same alpha-satellite array types but in distinct non-overlapping centromere domains.","method":"Chromatin immunoprecipitation (ChIP), truncation mutant analysis, immunoelectron microscopy","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP combined with domain mapping and ultrastructural analysis","pmids":["12006616"],"is_preprint":false},{"year":2003,"finding":"CENP-B interacts directly with CENP-C; the CENP-C domains required overlap with three Mif2 homologous regions also involved in centromere assembly; overproduction of truncated CENP-B lacking CENP-C interaction domains causes abnormal CENP-C domain duplication and cell cycle delay.","method":"Yeast two-hybrid, domain mapping by truncation, cellular overexpression assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — yeast two-hybrid confirmed by cellular phenotype, single lab","pmids":["14612452"],"is_preprint":false},{"year":2004,"finding":"Human CENP-C is SUMOylated in vitro by SUMO-1 and SUMO-2 at multiple lysine residues, including sites outside the canonical consensus sumoylation motif; the consensus sumoylation motif of CENP-C partially overlaps its DNA-binding and centromere localization domain.","method":"In vitro sumoylation reconstitution, tandem mass spectrometry identification of isopeptides","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro reconstitution with MS identification, single lab","pmids":["15272016"],"is_preprint":false},{"year":2007,"finding":"CENP-C inactivation in chicken DT40 cells causes mitotic delay, chromosome missegregation, and impairs the Mad2 spindle checkpoint pathway; CENP-C depletion significantly reduces Mis12 complex proteins at centromeres, placing CENP-C upstream of the Mis12 complex.","method":"Conditional knockout (tetracycline-inducible) in DT40 cells, live imaging, immunofluorescence, nocodazole checkpoint assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with multiple phenotypic readouts and epistasis","pmids":["17392512"],"is_preprint":false},{"year":2007,"finding":"During death receptor-induced apoptosis, activated caspase-7 cleaves CENP-C (and INCENP), leading to mislocalization of CENP-C and displacement of Aurora B kinase from centromeres; expression of non-cleavable CENP-C prevents passenger complex mislocalization.","method":"Caspase inhibitor treatment, site-directed mutagenesis of cleavage sites, immunofluorescence","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis rescue experiment combined with biochemical cleavage demonstration","pmids":["17287400"],"is_preprint":false},{"year":2009,"finding":"The N-terminus of CENP-C promotes kinetochore assembly by ensuring proper targeting of the Mis12/MIND complex and CENP-K; CENP-C mutants that localize to centromeres but fail to support kinetochore assembly were identified using Xenopus egg extract immunodepletion/complementation.","method":"Xenopus egg extract immunodepletion, in vitro translation complementation, immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution in egg extracts with domain mutant complementation","pmids":["19641019"],"is_preprint":false},{"year":2009,"finding":"DNMT3B interacts with CENP-C (identified by yeast two-hybrid and confirmed by co-immunoprecipitation); CENP-C recruits DNMT3B and DNA methylation to centromeric and pericentromeric repeats, and both proteins regulate histone marks in these regions.","method":"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown, bisulfite sequencing, ChIP","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods confirming interaction and functional consequence","pmids":["19482874"],"is_preprint":false},{"year":2009,"finding":"The C-terminal Mif2p homology domain III of CENP-C mediates homo-dimerization and homo-oligomerization, and mediates interactions with CENP-A and histone H3; domain II contacts alpha-satellite DNA and targets the centromere.","method":"Co-immunoprecipitation, bimolecular fluorescence complementation, ChIP, immunofluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vivo and in vitro methods, single lab","pmids":["19503796"],"is_preprint":false},{"year":2009,"finding":"Fission yeast CENP-C (Cnp3) serves as a scaffold for kinetochore effectors: Fta1/CENP-L binds directly to Cnp3, and ectopic Fta1 suppresses cnp3Δ mitotic defects; in meiosis, Cnp3 associates with and recruits the meiosis-specific protein Moa1 for mono-orientation of kinetochores.","method":"Genetic epistasis, yeast two-hybrid, co-immunoprecipitation, ectopic localization rescue","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — biochemical and genetic epistasis with multiple orthogonal methods","pmids":["19758558"],"is_preprint":false},{"year":2010,"finding":"CENP-C DNA binding is stabilized by single-stranded RNA; a localized 122-amino acid domain confers DNA binding, and long single-stranded RNAs matching centromeric RNAs in size strongly promote CENP-C binding to DNA in vitro; removal of the binding module causes partial delocalization in vivo.","method":"In vitro DNA-binding assays with RNA titration, domain deletion/substitution, in vivo localization","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro biochemical assay with in vivo confirmation, but in maize CENPC","pmids":["20140237"],"is_preprint":false},{"year":2011,"finding":"The N-terminal region of CENP-C contains a conserved motif that binds directly and with high affinity to the Mis12 complex, providing the key link between inner and outer kinetochore; expression of the isolated N-terminal Mis12-binding motif prevents outer kinetochore assembly and impairs the spindle assembly checkpoint.","method":"Direct binding assay, in vitro pulldown, dominant-negative expression in HeLa cells, immunofluorescence, checkpoint assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding reconstituted in vitro, confirmed by dominant-negative cellular phenotype, replicated by parallel study","pmids":["21353556"],"is_preprint":false},{"year":2011,"finding":"Drosophila CENP-C N-terminal region binds all KMN network components (Mis12 complex, Ndc80 complex, Spc105/KNL1); the Mis12 complex component Nnf1 interacts directly with CENP-C in vitro; targeting CENP-C N-terminus to centrosomes recruits KMN proteins at the expense of centromeres.","method":"In vitro pulldown, ectopic targeting assay (fusion to Plk4 centrosome domain), immunofluorescence","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro direct binding confirmed by ectopic recruitment assay, replicated by parallel study","pmids":["21353555"],"is_preprint":false},{"year":2011,"finding":"CENP-C recruits M18BP1 (of the Mis18 complex) to centromeres; depletion of CENP-C prevents M18BP1 targeting to metaphase centromeres and inhibits CENP-A chromatin assembly; M18BP1 directly binds CENP-C through conserved CENP-C domains.","method":"RNAi depletion, direct binding assay, co-immunoprecipitation, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct binding confirmed, depletion with defined functional consequence, replicated independently","pmids":["21911481"],"is_preprint":false},{"year":2012,"finding":"M18BP1 interacts directly with the C-terminus of CENP-C via a central SANT domain-containing region; knockdown of CENP-C reduces M18BP1 association and CENP-A levels at centromeres.","method":"Co-immunoprecipitation interaction screen, domain mapping, siRNA knockdown, immunofluorescence","journal":"Nucleus (Austin, Tex.)","confidence":"High","confidence_rationale":"Tier 2 — direct interaction mapped with domain precision, functional knockdown consequence, replicates prior finding","pmids":["22540025"],"is_preprint":false},{"year":2013,"finding":"CENP-C binds a hydrophobic region in the CENP-A C-terminal tail and docks onto the acidic patch of H2A/H2B on the nucleosome; the conserved CENP-C motif uses the same mechanism for CENP-A nucleosome recognition, revealing a conserved mechanism for centromere protein recruitment.","method":"Crystal structure determination, NMR, biochemical binding assays, mutagenesis","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — atomic structure with mutagenesis validation, high-impact journal, >270 citations","pmids":["23723239"],"is_preprint":false},{"year":2015,"finding":"CENP-C reshapes and rigidifies CENP-A nucleosomes using purified components: it changes the octameric histone core structure, rigidifies both surface and internal nucleosome structure, and modulates terminal DNA wrapping to match native CENP-A nucleosomes; CENP-C depletion leads to rapid removal of CENP-A from centromeres.","method":"In vitro reconstitution with purified components, hydrogen-deuterium exchange, FRET, CENP-C depletion","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with purified components, multiple biophysical methods, functional depletion, >180 citations","pmids":["25954010"],"is_preprint":false},{"year":2015,"finding":"The PEST domain in the N-terminal half of CENP-C interacts directly with the CENP-HIKM subcomplex; this interaction is required for kinetochore localization of CENP-HIKM and subsequently CENP-TW, establishing CENP-C as a blueprint for CCAN assembly.","method":"Biochemical reconstitution, co-immunoprecipitation, structure-guided mutagenesis, cellular kinetochore localization assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct in vitro interaction with mutagenesis and cellular validation","pmids":["26124289"],"is_preprint":false},{"year":2015,"finding":"CENP-C and CENP-T recruit the KMN network through distinct pathways: CENP-C recruits Ndc80 complex through KNL1 and Mis12 complex interactions, while CENP-T directly interacts with Ndc80; Aurora B kinase promotes KMN network recruitment to CENP-C whereas CDK regulates recruitment to CENP-T.","method":"Ectopic targeting to lac operator locus, domain mapping, kinase inhibitor treatment, immunofluorescence","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — separation of pathways by ectopic targeting with regulatory analysis","pmids":["25660545"],"is_preprint":false},{"year":2015,"finding":"CENP-C depletion in Xenopus egg extracts results in reduced CENP-T at centromeres and decreased recruitment of Ndc80 and Mis12, supporting two parallel pathways (CENP-C and CENP-T/W) for kinetochore assembly; CENP-C but not CENP-T/W participates in CENP-A deposition.","method":"Xenopus egg extract immunodepletion, immunofluorescence, cell-free reconstitution","journal":"Nucleus (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 — cell-free system with epistatic depletion, single lab","pmids":["25569378"],"is_preprint":false},{"year":2016,"finding":"Crystal structures of human MIS12 complex bound to a CENP-C fragment reveal the structural basis for the CENP-C–Mis12 interaction; Aurora B kinase phosphorylation regulates this interaction.","method":"X-ray crystallography, in vitro binding assay, kinase phosphorylation assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — atomic resolution crystal structure with regulatory biochemistry, >130 citations","pmids":["27881301"],"is_preprint":false},{"year":2016,"finding":"CENP-C reshapes CENP-A nucleosome structure mainly through sliding of DNA gyres back toward canonical H3 nucleosome positions, as demonstrated by single-molecule FRET using recombinant human histones.","method":"Single-molecule FRET, recombinant nucleosome reconstitution","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — single-molecule reconstitution with mechanistic resolution","pmids":["26878239"],"is_preprint":false},{"year":2017,"finding":"Active centromere alpha-satellite transcripts are complexed with CENP-A and CENP-C; depletion of array-specific RNAs reduces CENP-A and CENP-C at the targeted centromere via faulty CENP-A loading.","method":"RNA immunoprecipitation, RNA interference, immunofluorescence, ChIP","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 — RIP and depletion assays, single lab","pmids":["28787590"],"is_preprint":false},{"year":2017,"finding":"CENP-C motif and CENP-C central region both bind exclusively to CENP-A nucleosomes; in yeast, Mif2/CENP-C contacts one side of the nucleosome dyad engaging both the Cse4/CENP-A histone-fold domain and AT-rich centromere DNA through a contiguous DNA- and histone-binding domain (DHBD) harboring the CENP-C motif, an AT hook, and RK clusters.","method":"Biochemical binding assays, structural analysis, ChIP, mutagenesis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — multiple binding assays with domain mutagenesis and in vivo ChIP","pmids":["29074736"],"is_preprint":false},{"year":2017,"finding":"Aurora B phosphorylation of CENP-C (Thr28 in S. pombe Cnp3) impairs the interaction between CENP-C and the Mis12 complex; phosphorylation-mimicking CENP-C mutant results in defective chromosome segregation due to improper kinetochore assembly.","method":"Crystal structure determination, in vitro kinase assay, co-immunoprecipitation, mutant expression assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — structure with in vitro kinase assay and mutant phenotype","pmids":["29180432"],"is_preprint":false},{"year":2019,"finding":"CDK1-mediated phosphorylation of the CENP-C C-terminal region facilitates CENP-C binding to CENP-A nucleosomes in vitro and in vivo; enhanced CENP-A–CENP-C interaction promotes CENP-C kinetochore localization during mitosis.","method":"In vitro kinase assay, co-immunoprecipitation, phospho-mutant analysis, conditional depletion","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro phosphorylation combined with in vivo mutant rescue, multiple orthogonal methods","pmids":["31676716"],"is_preprint":false},{"year":2019,"finding":"CENP-C central region (CENP-CCR) binds CENP-A nucleosomes with high affinity through an extended hydrophobic area involving CENP-A V532 and V533; CENP-C binding causes two conformational changes: further exacerbation of loose DNA wrapping through destabilization of the H2A C-terminal tail, and rigidification of the H4 N-terminal tail favoring H4K20 monomethylation.","method":"Cryo-EM, NMR, in vitro binding assay, mutagenesis","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 — structural determination with biochemical validation and mutagenesis","pmids":["31475439"],"is_preprint":false},{"year":2020,"finding":"Mif2/CENP-C is auto-inhibited in its ability to bind the Mtw1 (Mis12) complex; addition of Cse4/CENP-A nucleosomes overcomes this auto-inhibition. A Mif2 mutant bypassing Cse4 requirement for Mtw1 binding causes mis-localization of the Mtw1 complex and chromosome segregation defects in vivo.","method":"Biochemical reconstitution, in vitro binding assay, genetic mutant analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of auto-inhibition relief, with in vivo mutant phenotype","pmids":["32515113"],"is_preprint":false},{"year":2022,"finding":"A lncRNA (CCTT) recruits CENP-C to centromeres via RNA-DNA triplex formation and direct RNA-protein interaction with CENP-C; loss of CCTT reduces CENP-C at centromeres and triggers extensive mitotic errors and aneuploidy.","method":"RNA-DNA triplex assay, RNA immunoprecipitation, CENP-C co-immunoprecipitation, siRNA knockdown, live imaging","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical assays with functional depletion, single lab","pmids":["36332605"],"is_preprint":false},{"year":2023,"finding":"CENP-C self-oligomerization via its Cupin domain is essential for CCAN assembly, centromeric chromatin organization, and centromeric localization of CCAN components; structural and biochemical analyses reveal distinct dimerization modes of the Cupin domain in chicken and human CENP-C.","method":"Crystal structure, biochemical oligomerization assay, CENP-C mutant complementation in cells, immunofluorescence","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — crystal structure with biochemical and cellular mutant validation","pmids":["37295434"],"is_preprint":false},{"year":2023,"finding":"Multi-site phosphorylation of yeast Mif2/CENP-C PEST region enhances inner kinetochore assembly; elimination of phosphorylation sites progressively impairs cellular fitness and is lethal in cells lacking non-essential inner kinetochore factors.","method":"Phospho-mutant genetic analysis, epistasis with inner kinetochore deletion mutants","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with phospho-mutants in yeast","pmids":["36736323"],"is_preprint":false}],"current_model":"CENP-C is a central scaffolding protein of the inner kinetochore that binds CENP-A nucleosomes through two conserved motifs (engaging the CENP-A tail hydrophobic region and the H2A/H2B acidic patch), reshapes and stabilizes those nucleosomes allosterically, recruits the Mis12 complex (and through it the entire KMN network) via a conserved N-terminal motif, recruits CENP-HIKM and CENP-TW subcomplexes via its PEST domain, recruits M18BP1/Mis18 complex to promote new CENP-A loading, self-oligomerizes through its C-terminal Cupin domain to organize the CCAN, and is regulated by CDK1 and Aurora B phosphorylation that modulate its CENP-A binding and Mis12 interactions respectively during the cell cycle."},"narrative":{"teleology":[{"year":1992,"claim":"Establishing CENP-C as a bona fide inner kinetochore plate component resolved the molecular identity of the inner centromere-microtubule interface.","evidence":"Immunoelectron microscopy with antibodies to cDNA-encoded fusion proteins in human cells","pmids":["1339310"],"confidence":"High","gaps":["No functional data on what CENP-C does at the kinetochore","No binding partners identified"]},{"year":1994,"claim":"Antibody injection demonstrated that CENP-C is functionally required for kinetochore assembly and microtubule attachment, transforming it from a structural marker to a functional component.","evidence":"Anti-CENP-C antibody microinjection causing metaphase arrest, reduced kinetochore diameter, and failure of microtubule binding","pmids":["8175879"],"confidence":"High","gaps":["Mechanism of kinetochore assembly role unknown","No molecular partners identified"]},{"year":1995,"claim":"CENP-C presence exclusively at active (not inactive) centromeres of dicentric chromosomes, combined with yeast Mif2 genetic interactions with CBF proteins, established CENP-C as an evolutionarily conserved component specifically of functional centromeres.","evidence":"Immunofluorescence/FISH on dicentric chromosomes; genetic epistasis of mif2 with centromere genes in S. cerevisiae","pmids":["8634687","7579695"],"confidence":"High","gaps":["No direct biochemical interaction with centromeric chromatin demonstrated","Mechanism of centromere specificity unknown"]},{"year":1997,"claim":"Domain-mapping studies revealed CENP-C as a modular protein with separable DNA-binding, centromere-targeting, and C-terminal dimerization functions, providing the first architectural framework.","evidence":"South-Western blotting, chemical cross-linking, gel filtration, and in vivo GFP-truncation analysis","pmids":["9146917","8668174","7883764"],"confidence":"Medium","gaps":["DNA binding shown only in vitro with non-centromeric substrates","Dimerization function not linked to in vivo kinetochore role"]},{"year":1999,"claim":"Conditional CENP-C knockout in DT40 cells proved CENP-C is essential for maintaining the entire centromere protein complex, not just one downstream effector, establishing its role as a central scaffold.","evidence":"Conditional gene disruption in chicken DT40 cells with immunofluorescence analysis of centromere complex integrity","pmids":["10428958"],"confidence":"High","gaps":["Identity of the downstream centromere proteins dependent on CENP-C not fully catalogued","No direct protein-protein interactions mapped"]},{"year":2001,"claim":"Epistasis experiments in vertebrate and worm systems placed CENP-C downstream of CENP-A/CENP-H and upstream of outer kinetochore proteins, defining its position in the assembly hierarchy.","evidence":"Conditional CENP-H knockout in DT40 and HCP-4 RNAi in C. elegans with localization epistasis readouts","pmids":["11500386","11402064"],"confidence":"High","gaps":["Direct physical basis for CENP-A → CENP-C → outer kinetochore connections not established","Whether hierarchy is identical across organisms unclear"]},{"year":2007,"claim":"CENP-C depletion was shown to reduce Mis12 complex at centromeres and impair the Mad2 checkpoint pathway, identifying Mis12 as a key downstream effector and linking CENP-C to checkpoint signaling.","evidence":"Conditional CENP-C knockout in DT40 with live imaging, nocodazole checkpoint assay, and immunofluorescence for Mis12","pmids":["17392512"],"confidence":"High","gaps":["Whether CENP-C contacts Mis12 complex directly or indirectly unknown","Checkpoint defect could be indirect consequence of reduced kinetochore"]},{"year":2009,"claim":"Reconstitution in Xenopus egg extracts and fission yeast identified specific CENP-C domains that directly recruit Mis12/MIND complex and CENP-L, establishing CENP-C as a multi-arm scaffold with separable effector-binding surfaces.","evidence":"Xenopus egg extract immunodepletion/complementation with domain mutants; yeast two-hybrid and co-IP of Cnp3-Fta1 in S. pombe","pmids":["19641019","19758558"],"confidence":"High","gaps":["Atomic basis of CENP-C–Mis12 interaction not yet resolved","CENP-HIKM recruitment mechanism not addressed"]},{"year":2011,"claim":"Direct high-affinity binding between a conserved CENP-C N-terminal motif and the Mis12 complex was demonstrated, providing the molecular link between inner and outer kinetochore; separately, CENP-C was shown to recruit M18BP1/Mis18 for CENP-A loading, connecting kinetochore architecture to centromere propagation.","evidence":"In vitro direct binding and dominant-negative expression in human/Drosophila cells for Mis12; RNAi and direct binding assays for M18BP1 in human/Xenopus systems","pmids":["21353556","21353555","21911481"],"confidence":"High","gaps":["Structural basis of CENP-C–Mis12 interface not resolved","How CENP-C coordinates Mis12 recruitment and M18BP1 recruitment temporally unclear"]},{"year":2013,"claim":"Crystal structures revealed how CENP-C recognizes CENP-A nucleosomes: the CENP-C motif docks onto the CENP-A tail hydrophobic region and the H2A/H2B acidic patch, providing the first atomic-resolution view of centromere-specific chromatin recognition.","evidence":"X-ray crystallography and NMR of CENP-C motif bound to CENP-A nucleosome, with mutagenesis validation","pmids":["23723239"],"confidence":"High","gaps":["How full-length CENP-C engages the nucleosome in situ unknown","Role of the second CENP-A-binding region (central domain) not structurally resolved"]},{"year":2015,"claim":"Biophysical reconstitution demonstrated that CENP-C binding allosterically reshapes CENP-A nucleosomes — rigidifying both surface and internal structure and modulating DNA wrapping — revealing CENP-C as an active chromatin remodeler rather than a passive reader; separately, the PEST domain was identified as the CENP-HIKM recruitment site.","evidence":"Hydrogen-deuterium exchange, FRET, and CENP-C depletion for nucleosome reshaping; biochemical reconstitution and mutagenesis for PEST–CENP-HIKM interaction","pmids":["25954010","26124289","25660545"],"confidence":"High","gaps":["Structural basis of CENP-C–CENP-HIKM interaction at atomic resolution unknown","Whether reshaping occurs on native centromeric chromatin in vivo not shown"]},{"year":2016,"claim":"Crystal structures of the Mis12 complex bound to a CENP-C fragment revealed the structural basis of the inner-to-outer kinetochore bridge and showed Aurora B phosphorylation regulates this interface, providing a mechanism for error correction.","evidence":"X-ray crystallography of human MIS12–CENP-C complex, in vitro kinase assay","pmids":["27881301"],"confidence":"High","gaps":["How Aurora B accesses CENP-C at the kinetochore in vivo not established","Quantitative regulation during error correction not measured"]},{"year":2019,"claim":"CDK1 phosphorylation of the CENP-C C-terminal region was shown to enhance CENP-A nucleosome binding in mitosis, providing a cell-cycle switch that strengthens CENP-C kinetochore localization specifically when needed; concurrently, cryo-EM revealed the CENP-C central region destabilizes H2A C-terminal tail and rigidifies H4 N-tail to favor H4K20me1.","evidence":"In vitro kinase assay and phospho-mutant analysis for CDK1 regulation; cryo-EM and NMR for structural mechanism","pmids":["31676716","31475439"],"confidence":"High","gaps":["Whether CDK1 and Aurora B phosphorylation are coordinated on the same CENP-C molecule unknown","Functional significance of H4K20me1 promotion at centromeres not directly tested"]},{"year":2020,"claim":"Demonstration that Mif2/CENP-C is auto-inhibited for Mis12 binding until relieved by CENP-A nucleosome engagement provided a conformational switch ensuring outer kinetochore assembly occurs only at centromeric chromatin.","evidence":"In vitro reconstitution with purified yeast components; bypass mutant causing ectopic Mtw1 localization and segregation defects","pmids":["32515113"],"confidence":"High","gaps":["Whether auto-inhibition operates in vertebrate CENP-C not demonstrated","Structural basis of the conformational change not resolved"]},{"year":2023,"claim":"Crystal structures of the CENP-C Cupin domain showed that self-oligomerization is essential for CCAN assembly and centromeric chromatin organization, completing the picture of CENP-C as a multi-domain scaffold whose dimerization underlies higher-order centromere architecture.","evidence":"Crystal structures of chicken and human Cupin domains, oligomerization assays, complementation of CENP-C mutants in cells","pmids":["37295434"],"confidence":"High","gaps":["How Cupin-mediated oligomerization interfaces with CENP-A nucleosome arrays in situ unknown","Stoichiometry of CENP-C oligomers at native centromeres not determined"]},{"year":null,"claim":"A full structural model of CENP-C engaged with a CENP-A nucleosome and simultaneously bound to Mis12, CENP-HIKM, and M18BP1 — capturing the integrated hub architecture — remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of full-length CENP-C in complex with its multiple binding partners","Whether the auto-inhibition mechanism discovered in yeast operates in human CENP-C is untested","How lncRNA and centromeric transcripts contribute to CENP-C recruitment in vivo under physiological conditions is incompletely resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,5,14,23,36]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[28,29,36,39]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,9,30,42]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[23,35,41]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[24,25]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,3,5,14,28,42]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,6,8]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,9,17,24,25,31,37,38]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[28,29,34,39,42]}],"complexes":["CCAN (constitutive centromere-associated network)","CENP-A nucleosome complex"],"partners":["CENPA","MIS12","DSN1","CENPH","CENPI","CENPK","M18BP1","DNMT3B"],"other_free_text":[]},"mechanistic_narrative":"CENP-C is the central scaffolding protein of the inner kinetochore, linking centromeric CENP-A chromatin to the outer kinetochore machinery and organizing the constitutive centromere-associated network (CCAN). It recognizes CENP-A nucleosomes through two conserved motifs that engage the CENP-A C-terminal tail hydrophobic region and the H2A/H2B acidic patch, allosterically reshaping and rigidifying CENP-A nucleosome structure to stabilize centromeric chromatin [PMID:23723239, PMID:25954010, PMID:26878239]. Its N-terminal motif directly recruits the Mis12 complex — thereby bridging the KMN outer kinetochore network — while its PEST domain recruits the CENP-HIKM and CENP-TW subcomplexes, and its C-terminal Cupin domain mediates essential self-oligomerization for CCAN organization; these interactions are regulated by CDK1 phosphorylation (enhancing CENP-A binding in mitosis), Aurora B phosphorylation (modulating Mis12 interaction), and an auto-inhibitory mechanism relieved by CENP-A nucleosome engagement [PMID:21353556, PMID:26124289, PMID:37295434, PMID:31676716, PMID:29180432, PMID:32515113]. CENP-C additionally recruits M18BP1/Mis18 complex to promote new CENP-A deposition, coupling kinetochore structure to epigenetic centromere maintenance [PMID:21911481, PMID:22540025]."},"prefetch_data":{"uniprot":{"accession":"Q03188","full_name":"Centromere protein C","aliases":["Centromere autoantigen C","Centromere protein C 1","CENP-C 1","Interphase centromere complex protein 7"],"length_aa":943,"mass_kda":106.8,"function":"Component of the CENPA-NAC (nucleosome-associated) complex, a complex that plays a central role in assembly of kinetochore proteins, mitotic progression and chromosome segregation. The CENPA-NAC complex recruits the CENPA-CAD (nucleosome distal) complex and may be involved in incorporation of newly synthesized CENPA into centromeres. CENPC recruits DNA methylation and DNMT3B to both centromeric and pericentromeric satellite repeats and regulates the histone code in these regions","subcellular_location":"Nucleus; Chromosome, centromere, kinetochore; Chromosome, centromere","url":"https://www.uniprot.org/uniprotkb/Q03188/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CENPC","classification":"Common Essential","n_dependent_lines":1070,"n_total_lines":1208,"dependency_fraction":0.8857615894039735},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CENPC","total_profiled":1310},"omim":[{"mim_id":"618137","title":"MIS18 KINETOCHORE PROTEIN A: MIS18A","url":"https://www.omim.org/entry/618137"},{"mim_id":"616232","title":"MEIOTIC KINETOCHORE FACTOR; MEIKIN","url":"https://www.omim.org/entry/616232"},{"mim_id":"611511","title":"MLF1-INTERACTING PROTEIN; MLF1IP","url":"https://www.omim.org/entry/611511"},{"mim_id":"611510","title":"CENTROMERIC PROTEIN T; CENPT","url":"https://www.omim.org/entry/611510"},{"mim_id":"611509","title":"CENTROMERIC PROTEIN N; CENPN","url":"https://www.omim.org/entry/611509"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear bodies","reliability":"Supported"},{"location":"Kinetochore","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Midbody","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CENPC"},"hgnc":{"alias_symbol":["CENP-C","hcp-4","MIF2"],"prev_symbol":["CENPC1"]},"alphafold":{"accession":"Q03188","domains":[{"cath_id":"2.60.120.10","chopping":"850-942","consensus_level":"high","plddt":91.9697,"start":850,"end":942}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q03188","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q03188-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q03188-F1-predicted_aligned_error_v6.png","plddt_mean":48.03},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CENPC","jax_strain_url":"https://www.jax.org/strain/search?query=CENPC"},"sequence":{"accession":"Q03188","fasta_url":"https://rest.uniprot.org/uniprotkb/Q03188.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q03188/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q03188"}},"corpus_meta":[{"pmid":"7579695","id":"PMC_7579695","title":"Evidence that the MIF2 gene of Saccharomyces cerevisiae encodes a centromere protein with homology to the mammalian centromere protein CENP-C.","date":"1995","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/7579695","citation_count":368,"is_preprint":false},{"pmid":"1339310","id":"PMC_1339310","title":"CENP-C, an autoantigen in scleroderma, is a component of the human inner kinetochore plate.","date":"1992","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/1339310","citation_count":325,"is_preprint":false},{"pmid":"17222555","id":"PMC_17222555","title":"Incorporation of Drosophila CID/CENP-A and CENP-C into centromeres during early embryonic anaphase.","date":"2007","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/17222555","citation_count":299,"is_preprint":false},{"pmid":"2475307","id":"PMC_2475307","title":"Visualization of centromere proteins CENP-B and CENP-C on a stable dicentric chromosome in cytological spreads.","date":"1989","source":"Chromosoma","url":"https://pubmed.ncbi.nlm.nih.gov/2475307","citation_count":282,"is_preprint":false},{"pmid":"23723239","id":"PMC_23723239","title":"A conserved mechanism for centromeric nucleosome recognition by centromere protein CENP-C.","date":"2013","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/23723239","citation_count":274,"is_preprint":false},{"pmid":"21353555","id":"PMC_21353555","title":"CENP-C is a structural platform for kinetochore assembly.","date":"2011","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/21353555","citation_count":223,"is_preprint":false},{"pmid":"21353556","id":"PMC_21353556","title":"Direct binding of Cenp-C to the Mis12 complex joins the inner and outer kinetochore.","date":"2011","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/21353556","citation_count":219,"is_preprint":false},{"pmid":"10075924","id":"PMC_10075924","title":"Specific destruction of kinetochore protein CENP-C and disruption of cell division by herpes simplex virus immediate-early protein Vmw110.","date":"1999","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/10075924","citation_count":204,"is_preprint":false},{"pmid":"8634687","id":"PMC_8634687","title":"Identification of centromeric antigens in dicentric Robertsonian translocations: CENP-C and CENP-E are necessary components of functional centromeres.","date":"1995","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8634687","citation_count":195,"is_preprint":false},{"pmid":"21911481","id":"PMC_21911481","title":"CENP-C recruits M18BP1 to centromeres to promote CENP-A chromatin assembly.","date":"2011","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/21911481","citation_count":187,"is_preprint":false},{"pmid":"25954010","id":"PMC_25954010","title":"Chromosomes. 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cDNA-encoded fusion proteins.\",\n      \"method\": \"Immunoelectron microscopy, immunoblotting, indirect immunofluorescence\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original identification with multiple orthogonal methods, foundational paper >300 citations\",\n      \"pmids\": [\"1339310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"CENP-C is required for maintaining proper kinetochore size and for a timely transition to anaphase; nuclear microinjection of anti-CENP-C antibodies during interphase causes metaphase arrest, reduces CENP-C at centromeres, and results in kinetochores of reduced diameter that fail to bind microtubules.\",\n      \"method\": \"Nuclear microinjection of antibodies, indirect immunofluorescence, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional antibody injection with EM phenotype, foundational study >175 citations\",\n      \"pmids\": [\"8175879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"CENP-C is a DNA-binding protein; recombinant human CENP-C binds DNA in vitro through an internal ~101-amino acid domain with no homology to known DNA-binding proteins.\",\n      \"method\": \"South-Western blotting, truncation analysis, recombinant protein expression\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assay, single lab\",\n      \"pmids\": [\"7883764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"CENP-C is selectively present at active centromeres but absent from inactive centromeres of dicentric chromosomes, establishing it as a necessary component of functional centromeres.\",\n      \"method\": \"Immunofluorescence with specific antibodies on dicentric chromosomes, simultaneous FISH\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across multiple dicentric chromosomes and independent labs\",\n      \"pmids\": [\"8634687\", \"7757082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The yeast CENP-C ortholog Mif2 functions at the centromere and genetically interacts with CEP1/CBF1, NDC10/CBF2, and CEP3/CBF3B centromere protein genes; two regions of homology between Mif2 and CENP-C are identified, and temperature-sensitive mif2 mutations map within these conserved regions.\",\n      \"method\": \"Genetic epistasis, synthetic lethality screens, suppressor analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic interactions in yeast, replicated, >350 citations\",\n      \"pmids\": [\"7579695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CENP-C contains an autonomous centromere-targeting domain in its central region that overlaps with its DNA-binding domain; mutations in the Mif2 homology domain impair kinetochore assembly.\",\n      \"method\": \"In vivo truncation/expression analysis of GFP-tagged constructs, in vitro DNA-binding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — combined in vivo and in vitro domain mapping, >100 citations\",\n      \"pmids\": [\"8668174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CENP-C interacts in vitro and in vivo with nucleolar transcription factors UBF1 and UBF2 (NOR-90) through the carboxyl-terminal third of CENP-C; a subset of CENP-C and UBF co-localizes at nucleoli in interphase HeLa cells.\",\n      \"method\": \"Affinity chromatography, microsequencing, co-immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — affinity pulldown with microsequence confirmation and co-localization, single lab\",\n      \"pmids\": [\"8702533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Human CENP-C has three functional domains: a putative N-terminal oligomerization domain, an internal DNA-binding domain (with 'core' and 'stabilizing' elements), and a C-terminal dimerization domain; the C-terminus forms dimers in the native state.\",\n      \"method\": \"In vitro DNA-binding assay (South-Western), chemical cross-linking, gel filtration\",\n      \"journal\": \"Chromosome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — multiple in vitro biochemical methods, single lab\",\n      \"pmids\": [\"9146917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CENP-C interacts with HDaxx (human Daxx) in an interphase-specific manner; the interaction is mediated by the N-terminal 315 amino acids of CENP-C and the C-terminal 104 amino acids of HDaxx, with co-localization at discrete nuclear spots in interphase.\",\n      \"method\": \"Yeast interaction trap, co-immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — yeast two-hybrid confirmed by co-localization, single lab\",\n      \"pmids\": [\"9645950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CENP-C is necessary for centromere complex assembly; loss of CENP-C from centromeres in chicken DT40 cells disassembles the centromere protein complex and blocks cells at the metaphase-anaphase junction.\",\n      \"method\": \"Conditional gene disruption in DT40 cells, immunofluorescence\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined cellular phenotype\",\n      \"pmids\": [\"10428958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"HSV-1 immediate-early protein Vmw110 (ICP0) causes proteasome-dependent loss of CENP-C from centromeres via its RING finger domain, resulting in substantial ultrastructural changes in the kinetochore and mitotic arrest or aberrant cytokinesis.\",\n      \"method\": \"Viral infection assays, immunofluorescence, electron microscopy, proteasome inhibitor treatment\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods showing CENP-C destruction mechanism\",\n      \"pmids\": [\"10075924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CENP-H is required for centromere targeting of CENP-C but not CENP-A in vertebrate cells, placing CENP-H upstream of CENP-C in a hierarchical centromere assembly pathway.\",\n      \"method\": \"Conditional knockout in DT40 cells, immunocytochemistry\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via conditional KO with specific localization phenotype\",\n      \"pmids\": [\"11500386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"C. elegans HCP-4 (CENP-C ortholog) is required for sister centromere resolution and kinetochore formation; HCP-4 localization depends on the centromeric histone HCP-3, and HCP-4 is in turn required for localization of the CENP-F-like protein HCP-1, establishing an ordered assembly pathway.\",\n      \"method\": \"RNAi, immunofluorescence, localization epistasis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via RNAi with multiple localization readouts\",\n      \"pmids\": [\"11402064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Temperature-sensitive CENP-C mutants in DT40 cells cause metaphase delay and chromosome missegregation; SUMO-1 overexpression suppresses the temperature-sensitive phenotype, implicating SUMO-1 in centromere function.\",\n      \"method\": \"Gene targeting in DT40 cells, cDNA library suppressor screen, temperature-shift experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — suppressor screen in vertebrate cells, single lab\",\n      \"pmids\": [\"11557811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CENP-C binds alpha-satellite DNA selectively in vivo; the region between amino acids 410 and 537 is required for in vivo DNA binding, and CENP-C and CENP-B associate with the same alpha-satellite array types but in distinct non-overlapping centromere domains.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), truncation mutant analysis, immunoelectron microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP combined with domain mapping and ultrastructural analysis\",\n      \"pmids\": [\"12006616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CENP-B interacts directly with CENP-C; the CENP-C domains required overlap with three Mif2 homologous regions also involved in centromere assembly; overproduction of truncated CENP-B lacking CENP-C interaction domains causes abnormal CENP-C domain duplication and cell cycle delay.\",\n      \"method\": \"Yeast two-hybrid, domain mapping by truncation, cellular overexpression assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — yeast two-hybrid confirmed by cellular phenotype, single lab\",\n      \"pmids\": [\"14612452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human CENP-C is SUMOylated in vitro by SUMO-1 and SUMO-2 at multiple lysine residues, including sites outside the canonical consensus sumoylation motif; the consensus sumoylation motif of CENP-C partially overlaps its DNA-binding and centromere localization domain.\",\n      \"method\": \"In vitro sumoylation reconstitution, tandem mass spectrometry identification of isopeptides\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with MS identification, single lab\",\n      \"pmids\": [\"15272016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CENP-C inactivation in chicken DT40 cells causes mitotic delay, chromosome missegregation, and impairs the Mad2 spindle checkpoint pathway; CENP-C depletion significantly reduces Mis12 complex proteins at centromeres, placing CENP-C upstream of the Mis12 complex.\",\n      \"method\": \"Conditional knockout (tetracycline-inducible) in DT40 cells, live imaging, immunofluorescence, nocodazole checkpoint assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with multiple phenotypic readouts and epistasis\",\n      \"pmids\": [\"17392512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"During death receptor-induced apoptosis, activated caspase-7 cleaves CENP-C (and INCENP), leading to mislocalization of CENP-C and displacement of Aurora B kinase from centromeres; expression of non-cleavable CENP-C prevents passenger complex mislocalization.\",\n      \"method\": \"Caspase inhibitor treatment, site-directed mutagenesis of cleavage sites, immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis rescue experiment combined with biochemical cleavage demonstration\",\n      \"pmids\": [\"17287400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The N-terminus of CENP-C promotes kinetochore assembly by ensuring proper targeting of the Mis12/MIND complex and CENP-K; CENP-C mutants that localize to centromeres but fail to support kinetochore assembly were identified using Xenopus egg extract immunodepletion/complementation.\",\n      \"method\": \"Xenopus egg extract immunodepletion, in vitro translation complementation, immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution in egg extracts with domain mutant complementation\",\n      \"pmids\": [\"19641019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DNMT3B interacts with CENP-C (identified by yeast two-hybrid and confirmed by co-immunoprecipitation); CENP-C recruits DNMT3B and DNA methylation to centromeric and pericentromeric repeats, and both proteins regulate histone marks in these regions.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown, bisulfite sequencing, ChIP\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods confirming interaction and functional consequence\",\n      \"pmids\": [\"19482874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The C-terminal Mif2p homology domain III of CENP-C mediates homo-dimerization and homo-oligomerization, and mediates interactions with CENP-A and histone H3; domain II contacts alpha-satellite DNA and targets the centromere.\",\n      \"method\": \"Co-immunoprecipitation, bimolecular fluorescence complementation, ChIP, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo and in vitro methods, single lab\",\n      \"pmids\": [\"19503796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Fission yeast CENP-C (Cnp3) serves as a scaffold for kinetochore effectors: Fta1/CENP-L binds directly to Cnp3, and ectopic Fta1 suppresses cnp3Δ mitotic defects; in meiosis, Cnp3 associates with and recruits the meiosis-specific protein Moa1 for mono-orientation of kinetochores.\",\n      \"method\": \"Genetic epistasis, yeast two-hybrid, co-immunoprecipitation, ectopic localization rescue\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical and genetic epistasis with multiple orthogonal methods\",\n      \"pmids\": [\"19758558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CENP-C DNA binding is stabilized by single-stranded RNA; a localized 122-amino acid domain confers DNA binding, and long single-stranded RNAs matching centromeric RNAs in size strongly promote CENP-C binding to DNA in vitro; removal of the binding module causes partial delocalization in vivo.\",\n      \"method\": \"In vitro DNA-binding assays with RNA titration, domain deletion/substitution, in vivo localization\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assay with in vivo confirmation, but in maize CENPC\",\n      \"pmids\": [\"20140237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The N-terminal region of CENP-C contains a conserved motif that binds directly and with high affinity to the Mis12 complex, providing the key link between inner and outer kinetochore; expression of the isolated N-terminal Mis12-binding motif prevents outer kinetochore assembly and impairs the spindle assembly checkpoint.\",\n      \"method\": \"Direct binding assay, in vitro pulldown, dominant-negative expression in HeLa cells, immunofluorescence, checkpoint assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding reconstituted in vitro, confirmed by dominant-negative cellular phenotype, replicated by parallel study\",\n      \"pmids\": [\"21353556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Drosophila CENP-C N-terminal region binds all KMN network components (Mis12 complex, Ndc80 complex, Spc105/KNL1); the Mis12 complex component Nnf1 interacts directly with CENP-C in vitro; targeting CENP-C N-terminus to centrosomes recruits KMN proteins at the expense of centromeres.\",\n      \"method\": \"In vitro pulldown, ectopic targeting assay (fusion to Plk4 centrosome domain), immunofluorescence\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro direct binding confirmed by ectopic recruitment assay, replicated by parallel study\",\n      \"pmids\": [\"21353555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CENP-C recruits M18BP1 (of the Mis18 complex) to centromeres; depletion of CENP-C prevents M18BP1 targeting to metaphase centromeres and inhibits CENP-A chromatin assembly; M18BP1 directly binds CENP-C through conserved CENP-C domains.\",\n      \"method\": \"RNAi depletion, direct binding assay, co-immunoprecipitation, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding confirmed, depletion with defined functional consequence, replicated independently\",\n      \"pmids\": [\"21911481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"M18BP1 interacts directly with the C-terminus of CENP-C via a central SANT domain-containing region; knockdown of CENP-C reduces M18BP1 association and CENP-A levels at centromeres.\",\n      \"method\": \"Co-immunoprecipitation interaction screen, domain mapping, siRNA knockdown, immunofluorescence\",\n      \"journal\": \"Nucleus (Austin, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction mapped with domain precision, functional knockdown consequence, replicates prior finding\",\n      \"pmids\": [\"22540025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CENP-C binds a hydrophobic region in the CENP-A C-terminal tail and docks onto the acidic patch of H2A/H2B on the nucleosome; the conserved CENP-C motif uses the same mechanism for CENP-A nucleosome recognition, revealing a conserved mechanism for centromere protein recruitment.\",\n      \"method\": \"Crystal structure determination, NMR, biochemical binding assays, mutagenesis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic structure with mutagenesis validation, high-impact journal, >270 citations\",\n      \"pmids\": [\"23723239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CENP-C reshapes and rigidifies CENP-A nucleosomes using purified components: it changes the octameric histone core structure, rigidifies both surface and internal nucleosome structure, and modulates terminal DNA wrapping to match native CENP-A nucleosomes; CENP-C depletion leads to rapid removal of CENP-A from centromeres.\",\n      \"method\": \"In vitro reconstitution with purified components, hydrogen-deuterium exchange, FRET, CENP-C depletion\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with purified components, multiple biophysical methods, functional depletion, >180 citations\",\n      \"pmids\": [\"25954010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The PEST domain in the N-terminal half of CENP-C interacts directly with the CENP-HIKM subcomplex; this interaction is required for kinetochore localization of CENP-HIKM and subsequently CENP-TW, establishing CENP-C as a blueprint for CCAN assembly.\",\n      \"method\": \"Biochemical reconstitution, co-immunoprecipitation, structure-guided mutagenesis, cellular kinetochore localization assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro interaction with mutagenesis and cellular validation\",\n      \"pmids\": [\"26124289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CENP-C and CENP-T recruit the KMN network through distinct pathways: CENP-C recruits Ndc80 complex through KNL1 and Mis12 complex interactions, while CENP-T directly interacts with Ndc80; Aurora B kinase promotes KMN network recruitment to CENP-C whereas CDK regulates recruitment to CENP-T.\",\n      \"method\": \"Ectopic targeting to lac operator locus, domain mapping, kinase inhibitor treatment, immunofluorescence\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — separation of pathways by ectopic targeting with regulatory analysis\",\n      \"pmids\": [\"25660545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CENP-C depletion in Xenopus egg extracts results in reduced CENP-T at centromeres and decreased recruitment of Ndc80 and Mis12, supporting two parallel pathways (CENP-C and CENP-T/W) for kinetochore assembly; CENP-C but not CENP-T/W participates in CENP-A deposition.\",\n      \"method\": \"Xenopus egg extract immunodepletion, immunofluorescence, cell-free reconstitution\",\n      \"journal\": \"Nucleus (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-free system with epistatic depletion, single lab\",\n      \"pmids\": [\"25569378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structures of human MIS12 complex bound to a CENP-C fragment reveal the structural basis for the CENP-C–Mis12 interaction; Aurora B kinase phosphorylation regulates this interaction.\",\n      \"method\": \"X-ray crystallography, in vitro binding assay, kinase phosphorylation assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic resolution crystal structure with regulatory biochemistry, >130 citations\",\n      \"pmids\": [\"27881301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CENP-C reshapes CENP-A nucleosome structure mainly through sliding of DNA gyres back toward canonical H3 nucleosome positions, as demonstrated by single-molecule FRET using recombinant human histones.\",\n      \"method\": \"Single-molecule FRET, recombinant nucleosome reconstitution\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-molecule reconstitution with mechanistic resolution\",\n      \"pmids\": [\"26878239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Active centromere alpha-satellite transcripts are complexed with CENP-A and CENP-C; depletion of array-specific RNAs reduces CENP-A and CENP-C at the targeted centromere via faulty CENP-A loading.\",\n      \"method\": \"RNA immunoprecipitation, RNA interference, immunofluorescence, ChIP\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP and depletion assays, single lab\",\n      \"pmids\": [\"28787590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CENP-C motif and CENP-C central region both bind exclusively to CENP-A nucleosomes; in yeast, Mif2/CENP-C contacts one side of the nucleosome dyad engaging both the Cse4/CENP-A histone-fold domain and AT-rich centromere DNA through a contiguous DNA- and histone-binding domain (DHBD) harboring the CENP-C motif, an AT hook, and RK clusters.\",\n      \"method\": \"Biochemical binding assays, structural analysis, ChIP, mutagenesis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple binding assays with domain mutagenesis and in vivo ChIP\",\n      \"pmids\": [\"29074736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Aurora B phosphorylation of CENP-C (Thr28 in S. pombe Cnp3) impairs the interaction between CENP-C and the Mis12 complex; phosphorylation-mimicking CENP-C mutant results in defective chromosome segregation due to improper kinetochore assembly.\",\n      \"method\": \"Crystal structure determination, in vitro kinase assay, co-immunoprecipitation, mutant expression assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure with in vitro kinase assay and mutant phenotype\",\n      \"pmids\": [\"29180432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK1-mediated phosphorylation of the CENP-C C-terminal region facilitates CENP-C binding to CENP-A nucleosomes in vitro and in vivo; enhanced CENP-A–CENP-C interaction promotes CENP-C kinetochore localization during mitosis.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, phospho-mutant analysis, conditional depletion\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro phosphorylation combined with in vivo mutant rescue, multiple orthogonal methods\",\n      \"pmids\": [\"31676716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CENP-C central region (CENP-CCR) binds CENP-A nucleosomes with high affinity through an extended hydrophobic area involving CENP-A V532 and V533; CENP-C binding causes two conformational changes: further exacerbation of loose DNA wrapping through destabilization of the H2A C-terminal tail, and rigidification of the H4 N-terminal tail favoring H4K20 monomethylation.\",\n      \"method\": \"Cryo-EM, NMR, in vitro binding assay, mutagenesis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural determination with biochemical validation and mutagenesis\",\n      \"pmids\": [\"31475439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mif2/CENP-C is auto-inhibited in its ability to bind the Mtw1 (Mis12) complex; addition of Cse4/CENP-A nucleosomes overcomes this auto-inhibition. A Mif2 mutant bypassing Cse4 requirement for Mtw1 binding causes mis-localization of the Mtw1 complex and chromosome segregation defects in vivo.\",\n      \"method\": \"Biochemical reconstitution, in vitro binding assay, genetic mutant analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of auto-inhibition relief, with in vivo mutant phenotype\",\n      \"pmids\": [\"32515113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A lncRNA (CCTT) recruits CENP-C to centromeres via RNA-DNA triplex formation and direct RNA-protein interaction with CENP-C; loss of CCTT reduces CENP-C at centromeres and triggers extensive mitotic errors and aneuploidy.\",\n      \"method\": \"RNA-DNA triplex assay, RNA immunoprecipitation, CENP-C co-immunoprecipitation, siRNA knockdown, live imaging\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical assays with functional depletion, single lab\",\n      \"pmids\": [\"36332605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CENP-C self-oligomerization via its Cupin domain is essential for CCAN assembly, centromeric chromatin organization, and centromeric localization of CCAN components; structural and biochemical analyses reveal distinct dimerization modes of the Cupin domain in chicken and human CENP-C.\",\n      \"method\": \"Crystal structure, biochemical oligomerization assay, CENP-C mutant complementation in cells, immunofluorescence\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — crystal structure with biochemical and cellular mutant validation\",\n      \"pmids\": [\"37295434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Multi-site phosphorylation of yeast Mif2/CENP-C PEST region enhances inner kinetochore assembly; elimination of phosphorylation sites progressively impairs cellular fitness and is lethal in cells lacking non-essential inner kinetochore factors.\",\n      \"method\": \"Phospho-mutant genetic analysis, epistasis with inner kinetochore deletion mutants\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with phospho-mutants in yeast\",\n      \"pmids\": [\"36736323\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CENP-C is a central scaffolding protein of the inner kinetochore that binds CENP-A nucleosomes through two conserved motifs (engaging the CENP-A tail hydrophobic region and the H2A/H2B acidic patch), reshapes and stabilizes those nucleosomes allosterically, recruits the Mis12 complex (and through it the entire KMN network) via a conserved N-terminal motif, recruits CENP-HIKM and CENP-TW subcomplexes via its PEST domain, recruits M18BP1/Mis18 complex to promote new CENP-A loading, self-oligomerizes through its C-terminal Cupin domain to organize the CCAN, and is regulated by CDK1 and Aurora B phosphorylation that modulate its CENP-A binding and Mis12 interactions respectively during the cell cycle.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CENP-C is the central scaffolding protein of the inner kinetochore, linking centromeric CENP-A chromatin to the outer kinetochore machinery and organizing the constitutive centromere-associated network (CCAN). It recognizes CENP-A nucleosomes through two conserved motifs that engage the CENP-A C-terminal tail hydrophobic region and the H2A/H2B acidic patch, allosterically reshaping and rigidifying CENP-A nucleosome structure to stabilize centromeric chromatin [PMID:23723239, PMID:25954010, PMID:26878239]. Its N-terminal motif directly recruits the Mis12 complex — thereby bridging the KMN outer kinetochore network — while its PEST domain recruits the CENP-HIKM and CENP-TW subcomplexes, and its C-terminal Cupin domain mediates essential self-oligomerization for CCAN organization; these interactions are regulated by CDK1 phosphorylation (enhancing CENP-A binding in mitosis), Aurora B phosphorylation (modulating Mis12 interaction), and an auto-inhibitory mechanism relieved by CENP-A nucleosome engagement [PMID:21353556, PMID:26124289, PMID:37295434, PMID:31676716, PMID:29180432, PMID:32515113]. CENP-C additionally recruits M18BP1/Mis18 complex to promote new CENP-A deposition, coupling kinetochore structure to epigenetic centromere maintenance [PMID:21911481, PMID:22540025].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Establishing CENP-C as a bona fide inner kinetochore plate component resolved the molecular identity of the inner centromere-microtubule interface.\",\n      \"evidence\": \"Immunoelectron microscopy with antibodies to cDNA-encoded fusion proteins in human cells\",\n      \"pmids\": [\"1339310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional data on what CENP-C does at the kinetochore\", \"No binding partners identified\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Antibody injection demonstrated that CENP-C is functionally required for kinetochore assembly and microtubule attachment, transforming it from a structural marker to a functional component.\",\n      \"evidence\": \"Anti-CENP-C antibody microinjection causing metaphase arrest, reduced kinetochore diameter, and failure of microtubule binding\",\n      \"pmids\": [\"8175879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of kinetochore assembly role unknown\", \"No molecular partners identified\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"CENP-C presence exclusively at active (not inactive) centromeres of dicentric chromosomes, combined with yeast Mif2 genetic interactions with CBF proteins, established CENP-C as an evolutionarily conserved component specifically of functional centromeres.\",\n      \"evidence\": \"Immunofluorescence/FISH on dicentric chromosomes; genetic epistasis of mif2 with centromere genes in S. cerevisiae\",\n      \"pmids\": [\"8634687\", \"7579695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No direct biochemical interaction with centromeric chromatin demonstrated\", \"Mechanism of centromere specificity unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Domain-mapping studies revealed CENP-C as a modular protein with separable DNA-binding, centromere-targeting, and C-terminal dimerization functions, providing the first architectural framework.\",\n      \"evidence\": \"South-Western blotting, chemical cross-linking, gel filtration, and in vivo GFP-truncation analysis\",\n      \"pmids\": [\"9146917\", \"8668174\", \"7883764\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DNA binding shown only in vitro with non-centromeric substrates\", \"Dimerization function not linked to in vivo kinetochore role\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Conditional CENP-C knockout in DT40 cells proved CENP-C is essential for maintaining the entire centromere protein complex, not just one downstream effector, establishing its role as a central scaffold.\",\n      \"evidence\": \"Conditional gene disruption in chicken DT40 cells with immunofluorescence analysis of centromere complex integrity\",\n      \"pmids\": [\"10428958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the downstream centromere proteins dependent on CENP-C not fully catalogued\", \"No direct protein-protein interactions mapped\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Epistasis experiments in vertebrate and worm systems placed CENP-C downstream of CENP-A/CENP-H and upstream of outer kinetochore proteins, defining its position in the assembly hierarchy.\",\n      \"evidence\": \"Conditional CENP-H knockout in DT40 and HCP-4 RNAi in C. elegans with localization epistasis readouts\",\n      \"pmids\": [\"11500386\", \"11402064\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical basis for CENP-A → CENP-C → outer kinetochore connections not established\", \"Whether hierarchy is identical across organisms unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"CENP-C depletion was shown to reduce Mis12 complex at centromeres and impair the Mad2 checkpoint pathway, identifying Mis12 as a key downstream effector and linking CENP-C to checkpoint signaling.\",\n      \"evidence\": \"Conditional CENP-C knockout in DT40 with live imaging, nocodazole checkpoint assay, and immunofluorescence for Mis12\",\n      \"pmids\": [\"17392512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CENP-C contacts Mis12 complex directly or indirectly unknown\", \"Checkpoint defect could be indirect consequence of reduced kinetochore\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reconstitution in Xenopus egg extracts and fission yeast identified specific CENP-C domains that directly recruit Mis12/MIND complex and CENP-L, establishing CENP-C as a multi-arm scaffold with separable effector-binding surfaces.\",\n      \"evidence\": \"Xenopus egg extract immunodepletion/complementation with domain mutants; yeast two-hybrid and co-IP of Cnp3-Fta1 in S. pombe\",\n      \"pmids\": [\"19641019\", \"19758558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic basis of CENP-C–Mis12 interaction not yet resolved\", \"CENP-HIKM recruitment mechanism not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Direct high-affinity binding between a conserved CENP-C N-terminal motif and the Mis12 complex was demonstrated, providing the molecular link between inner and outer kinetochore; separately, CENP-C was shown to recruit M18BP1/Mis18 for CENP-A loading, connecting kinetochore architecture to centromere propagation.\",\n      \"evidence\": \"In vitro direct binding and dominant-negative expression in human/Drosophila cells for Mis12; RNAi and direct binding assays for M18BP1 in human/Xenopus systems\",\n      \"pmids\": [\"21353556\", \"21353555\", \"21911481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CENP-C–Mis12 interface not resolved\", \"How CENP-C coordinates Mis12 recruitment and M18BP1 recruitment temporally unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Crystal structures revealed how CENP-C recognizes CENP-A nucleosomes: the CENP-C motif docks onto the CENP-A tail hydrophobic region and the H2A/H2B acidic patch, providing the first atomic-resolution view of centromere-specific chromatin recognition.\",\n      \"evidence\": \"X-ray crystallography and NMR of CENP-C motif bound to CENP-A nucleosome, with mutagenesis validation\",\n      \"pmids\": [\"23723239\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How full-length CENP-C engages the nucleosome in situ unknown\", \"Role of the second CENP-A-binding region (central domain) not structurally resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Biophysical reconstitution demonstrated that CENP-C binding allosterically reshapes CENP-A nucleosomes — rigidifying both surface and internal structure and modulating DNA wrapping — revealing CENP-C as an active chromatin remodeler rather than a passive reader; separately, the PEST domain was identified as the CENP-HIKM recruitment site.\",\n      \"evidence\": \"Hydrogen-deuterium exchange, FRET, and CENP-C depletion for nucleosome reshaping; biochemical reconstitution and mutagenesis for PEST–CENP-HIKM interaction\",\n      \"pmids\": [\"25954010\", \"26124289\", \"25660545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CENP-C–CENP-HIKM interaction at atomic resolution unknown\", \"Whether reshaping occurs on native centromeric chromatin in vivo not shown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Crystal structures of the Mis12 complex bound to a CENP-C fragment revealed the structural basis of the inner-to-outer kinetochore bridge and showed Aurora B phosphorylation regulates this interface, providing a mechanism for error correction.\",\n      \"evidence\": \"X-ray crystallography of human MIS12–CENP-C complex, in vitro kinase assay\",\n      \"pmids\": [\"27881301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Aurora B accesses CENP-C at the kinetochore in vivo not established\", \"Quantitative regulation during error correction not measured\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"CDK1 phosphorylation of the CENP-C C-terminal region was shown to enhance CENP-A nucleosome binding in mitosis, providing a cell-cycle switch that strengthens CENP-C kinetochore localization specifically when needed; concurrently, cryo-EM revealed the CENP-C central region destabilizes H2A C-terminal tail and rigidifies H4 N-tail to favor H4K20me1.\",\n      \"evidence\": \"In vitro kinase assay and phospho-mutant analysis for CDK1 regulation; cryo-EM and NMR for structural mechanism\",\n      \"pmids\": [\"31676716\", \"31475439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CDK1 and Aurora B phosphorylation are coordinated on the same CENP-C molecule unknown\", \"Functional significance of H4K20me1 promotion at centromeres not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that Mif2/CENP-C is auto-inhibited for Mis12 binding until relieved by CENP-A nucleosome engagement provided a conformational switch ensuring outer kinetochore assembly occurs only at centromeric chromatin.\",\n      \"evidence\": \"In vitro reconstitution with purified yeast components; bypass mutant causing ectopic Mtw1 localization and segregation defects\",\n      \"pmids\": [\"32515113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether auto-inhibition operates in vertebrate CENP-C not demonstrated\", \"Structural basis of the conformational change not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Crystal structures of the CENP-C Cupin domain showed that self-oligomerization is essential for CCAN assembly and centromeric chromatin organization, completing the picture of CENP-C as a multi-domain scaffold whose dimerization underlies higher-order centromere architecture.\",\n      \"evidence\": \"Crystal structures of chicken and human Cupin domains, oligomerization assays, complementation of CENP-C mutants in cells\",\n      \"pmids\": [\"37295434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Cupin-mediated oligomerization interfaces with CENP-A nucleosome arrays in situ unknown\", \"Stoichiometry of CENP-C oligomers at native centromeres not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A full structural model of CENP-C engaged with a CENP-A nucleosome and simultaneously bound to Mis12, CENP-HIKM, and M18BP1 — capturing the integrated hub architecture — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structure of full-length CENP-C in complex with its multiple binding partners\",\n        \"Whether the auto-inhibition mechanism discovered in yeast operates in human CENP-C is untested\",\n        \"How lncRNA and centromeric transcripts contribute to CENP-C recruitment in vivo under physiological conditions is incompletely resolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 5, 14, 23, 36]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [28, 29, 36, 39]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 9, 30, 42]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [23, 35, 41]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [24, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 3, 5, 14, 28, 42]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 6, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 9, 17, 24, 25, 31, 37, 38]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [28, 29, 34, 39, 42]}\n    ],\n    \"complexes\": [\n      \"CCAN (constitutive centromere-associated network)\",\n      \"CENP-A nucleosome complex\"\n    ],\n    \"partners\": [\n      \"CENPA\",\n      \"MIS12\",\n      \"DSN1\",\n      \"CENPH\",\n      \"CENPI\",\n      \"CENPK\",\n      \"M18BP1\",\n      \"DNMT3B\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}