{"gene":"NUF2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1994,"finding":"NUF2 encodes a spindle pole body (SPB)-associated protein in budding yeast required for nuclear division; temperature-sensitive alleles cause arrest with a short mitotic spindle and undivided nucleus, and anti-Nuf2 antibodies cross-react with a mammalian centrosome-associated protein, suggesting conserved function.","method":"Coimmunofluorescence with SPB markers, temperature-sensitive mutagenesis, fractionation (salt/detergent/urea extraction)","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetic loss-of-function, coimmunofluorescence, biochemical fractionation) in foundational study, independently replicated in later work","pmids":["8188751"],"is_preprint":false},{"year":2001,"finding":"Nuf2 in fission yeast (S. pombe) is required for centromere-spindle connection and for the spindle assembly checkpoint; nuf2 null cells show spindle elongation without chromosome segregation, while certain ts alleles cause Mad2-dependent metaphase arrest, demonstrating Nuf2 is needed for both microtubule attachment and checkpoint signaling at the centromere.","method":"Gene disruption, temperature-sensitive allele analysis, epistasis with mad2 deletion, live cell microscopy","journal":"Chromosoma","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with epistasis (Mad2-dependent arrest), multiple alleles, replicated across organisms","pmids":["11685532"],"is_preprint":false},{"year":2003,"finding":"Nuf2 forms a stable complex with Hec1 throughout the cell cycle in vertebrate (chicken DT40) cells, localizing to centrosomes during G1/S and relocating to centromeres in G2/mitosis; conditional loss of either subunit causes prometaphase arrest, abolishes Mad2 kinetochore localization, and FRAP shows the complex is stably associated with centromeres during mitosis while its centrosome interaction is dynamic.","method":"GFP fusion live imaging, conditional knockout (DT40), FRAP, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments with FRAP, conditional KO with defined mitotic phenotype, replicated across systems","pmids":["12829748"],"is_preprint":false},{"year":2003,"finding":"RNAi depletion of Nuf2 or Hec1 in HeLa cells reduces both proteins at kinetochores and causes progressive, microtubule-dependent depletion of Mad1 and Mad2 from kinetochores during prometaphase; spindle depolymerization restores Mad1/Mad2 levels, supporting a model where Nuf2/Hec1 prevent microtubule-dependent stripping of checkpoint proteins.","method":"RNAi (siRNA) knockdown, quantitative immunofluorescence, spindle depolymerization rescue experiment","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi with defined phenotypic readout, reversibility experiment, replicated across two independent RNAi studies in HeLa cells","pmids":["14654001"],"is_preprint":false},{"year":2004,"finding":"Nuf2 and Hec1 localize throughout the outer plate (not the corona) of the vertebrate kinetochore, form a stable structural core distinct from dynamic checkpoint/motor proteins, and are required for formation and maintenance of the outer plate structure and for normal kinetochore microtubule attachment.","method":"Fluorescence light microscopy, live cell imaging, electron microscopy, RNAi knockdown with quantitative EM analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including electron microscopy with quantitative data, direct structural localization with functional consequence","pmids":["15548592"],"is_preprint":false},{"year":2005,"finding":"The Nuf2-Ndc80 complex (including Nuf2, Ndc80, Spc24, Spc25) disappears from centromeres during meiotic prophase in fission yeast coinciding with centromere-SPB dissociation; inactivation of Nuf2 by mutation causes premature centromere-SPB release, demonstrating that the Nuf2-Ndc80 complex physically connects centromeres to the SPB and that mating pheromone signaling triggers complex removal for meiotic kinetochore remodeling.","method":"Live cell imaging of GFP-tagged proteins in meiotic cells, genetic loss-of-function (nuf2 temperature-sensitive mutation), epistasis with pat1 mutant","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct live imaging combined with genetic epistasis, multiple conditions tested","pmids":["15728720"],"is_preprint":false},{"year":2005,"finding":"The functional region of CENP-H interacts directly with Hec1 (a member of the Nuf2 complex) as demonstrated by yeast two-hybrid and coimmunoprecipitation in chicken DT40 cells; the Nuf2 complex is proposed to act as a connector between inner (CENP-H side) and outer kinetochore during mitosis.","method":"Yeast two-hybrid, coimmunoprecipitation, conditional loss-of-function mutant, FRAP","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP confirming yeast two-hybrid interaction, FRAP for dynamics, single lab","pmids":["15713649"],"is_preprint":false},{"year":2006,"finding":"CDCA1 (NUF2) forms a complex with KNTC2 (Hec1/NDC80); a cell-permeable 19-amino-acid peptide derived from the CDCA1 binding domain to KNTC2 (residues 398–416) disrupts complex formation and suppresses lung cancer cell growth, mapping the interaction interface of the CDCA1-KNTC2 dimer.","method":"Cell-permeable peptide competition assay, siRNA knockdown, cell growth assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — peptide competition assay maps binding domain, supported by functional growth suppression, but no direct structural/biochemical reconstitution","pmids":["17079454"],"is_preprint":false},{"year":2007,"finding":"Human NUF2 is required for stable kinetochore localization of CENP-E; NUF2 physically interacts with the C-terminal domain of CENP-E via its own C-terminal domain (mapped by GST pulldown and yeast two-hybrid); siRNA depletion of NUF2 abolishes CENP-E kinetochore localization and reduces kinetochore tension, with double knockdown of CENP-E and NUF2 further eliminating tension.","method":"GST pulldown, yeast two-hybrid, siRNA knockdown, immunofluorescence, tension measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — GST pulldown plus yeast two-hybrid mapping interaction domain, functional siRNA with defined mechanistic readout (CENP-E localization and kinetochore tension), single lab with two orthogonal binding methods","pmids":["17535814"],"is_preprint":false},{"year":2011,"finding":"The calponin homology (CH) domains of both Hec1 and Nuf2 contribute to kinetochore-microtubule attachment, but in distinct ways: Hec1 CH domain mutants show the most severe attachment defects; Nuf2 CH domain mutants generate stable kinetochore-microtubule attachments but fail to produce wild-type interkinetochore tension and delay anaphase onset, indicating the Nuf2 CH domain is dispensable for initial attachment but required for tension generation.","method":"Gene silencing and rescue (siRNA + re-expression of mutant constructs), live cell imaging, kinetochore-microtubule attachment assays, interkinetochore distance measurement","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — structure-function mutagenesis with rescue approach, multiple functional readouts, single lab but rigorous design","pmids":["21270439"],"is_preprint":false},{"year":2012,"finding":"PTPIP51 interacts with Nuf2 (and CGI-99) in vitro and in vivo; the PTPIP51/Nuf2 complex localizes to the equatorial region during mitosis, as shown by Duolink proximity ligation assays and confocal microscopy.","method":"In vitro binding, in vivo colocalization, Duolink proximity ligation assay, confocal microscopy","journal":"Biomolecules","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, proximity ligation assay only; functional significance of the interaction not fully resolved","pmids":["24970130"],"is_preprint":false},{"year":2013,"finding":"Hec1-Nuf2 heterodimerization requires three contiguous heptad repeats (Leu-324 to Leu-352) of Hec1; three buried glutamic acid residues (Glu-334, Glu-341, Glu-348) in Hec1 form complementary ionic pairs with three Nuf2 lysine residues (Lys-227, Lys-234, Lys-241); alanine substitution of either set disrupts the dimer, destabilizes the NDC80 complex, and blocks mitotic progression.","method":"Co-immunoprecipitation, domain mapping, alanine-scanning mutagenesis, cell-based mitotic progression assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis of specific residues at the dimerization interface combined with co-IP and functional mitosis assays, defining structural basis of Hec1-Nuf2 interaction","pmids":["24129578"],"is_preprint":false},{"year":2015,"finding":"Nuf2 localizes to kinetochores from germinal vesicle breakdown through metaphase I in mouse oocytes, disappears at anaphase I, and reappears at MII; overexpression causes defective spindles, chromosome misalignment, and spindle checkpoint activation blocking meiotic progression, while Nuf2 knockdown causes premature polar body extrusion with misaligned chromosomes and aneuploidy.","method":"mRNA injection, immunofluorescence, morpholino knockdown, flow cytometry for spindle checkpoint","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments combined with gain- and loss-of-function in oocyte meiosis with defined phenotypic readouts, single lab","pmids":["26054848"],"is_preprint":false},{"year":2015,"finding":"hnRNP K directly transactivates the NUF2 gene; hnRNP K knockdown reduces NUF2 expression and causes failure in metaphase chromosome alignment, linking hnRNP K to kinetochore function via NUF2 transcriptional regulation.","method":"ChIP (chromatin immunoprecipitation), reporter assay, siRNA knockdown, immunofluorescence for chromosome alignment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct transcriptional regulation of NUF2 by hnRNP K, functional knockdown with defined mitotic phenotype, single lab","pmids":["25701787"],"is_preprint":false},{"year":2021,"finding":"Nuf2 is preferentially modified by poly-SUMO-2/3 chains during mitosis; this modification is required for CENP-E kinetochore localization and chromosome congression. A Nuf2-Ubc9 fusion (to stimulate SUMO modification) or a Nuf2–SUMO-2 trimer fusion rescues CENP-E localization defects caused by global sumoylation inhibition, while Nuf2 fused to SUMO-2 monomer, dimer, or SUMO-1 trimer cannot. The SUMO-2/3-trimeric chain-modified Nuf2 binds CENP-E with higher affinity through CENP-E's SUMO-interacting motif (SIM).","method":"SUMO modification assays, Nuf2-SUMO/Ubc9 fusion rescue experiments, binding affinity assays (CENP-E SIM mutant controls), immunofluorescence","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal rescue constructs with defined controls (SIM mutant), mechanistic dissection of chain-length and type specificity, single lab with rigorous structure-function approach","pmids":["33910471"],"is_preprint":false},{"year":2021,"finding":"A de novo missense variant in NUF2 (affecting the calponin homology domain at the N-terminus, which interfaces with NDC80) causes markedly reduced protein levels of both NUF2 and NDC80, aneuploidy, increased micronuclei, and spindle abnormalities in patient-derived lymphoblastoid cells, demonstrating that NUF2 CH domain integrity is required for NDC80 complex stability in human cells and that NUF2 loss-of-function causes a developmental syndrome (microcephaly, short stature).","method":"Whole-exome sequencing, patient-derived lymphoblastoid cell analysis, Western blot for NUF2 and NDC80 levels, chromosome and spindle analysis","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — patient variant functionally validated in primary cells with defined molecular readout (complex instability), single case study","pmids":["33721060"],"is_preprint":false},{"year":2022,"finding":"FOXM1 transcriptionally activates NUF2 by binding to its promoter (mapped by luciferase reporter assays and ChIP); FOXM1-induced proliferation of glioma TMZ-resistant cells is dependent on elevated NUF2 expression, as NUF2 knockdown abolishes the FOXM1-mediated proliferative phenotype.","method":"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), siRNA knockdown, rescue experiments","journal":"Neuropathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay establish direct transcriptional regulation; epistasis (rescue) confirms dependency, single lab","pmids":["35701983"],"is_preprint":false},{"year":2023,"finding":"NUF2 interacts with HNRNPA2B1 (identified by immunoprecipitation/mass spectrometry) and activates the PI3K/AKT/mTOR signaling pathway in ovarian cancer cells; HNRNPA2B1 silencing reduces NUF2 expression, placing HNRNPA2B1 upstream of NUF2.","method":"Immunoprecipitation/mass spectrometry, Co-IP, siRNA knockdown, Western blot for PI3K/AKT/mTOR pathway components","journal":"Journal of ovarian research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — IP/MS identifies interaction, Co-IP confirms, pathway activation assessed by Western blot; single lab, no reconstitution","pmids":["36670423"],"is_preprint":false},{"year":2023,"finding":"NUF2 promotes cholangiocarcinoma progression through the p38/MAPK signaling pathway by inhibiting p62-mediated autophagic degradation of transferrin receptor 1 (TFR1); NUF2 knockdown reduces TFR1 protein levels and impairs p38/MAPK activation.","method":"siRNA knockdown, Western blot, autophagy assays, Co-IP for p62-TFR1 interaction, xenograft models","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mechanistic pathway dissection with Co-IP and rescue assays, single lab","pmids":["37056930"],"is_preprint":false},{"year":2024,"finding":"NUF2 interacts with ERBB3 in hepatocellular carcinoma cells and inhibits ERBB3 ubiquitination-mediated degradation, thereby stabilizing ERBB3 protein levels and activating the PI3K/AKT signaling pathway to regulate cell cycle progression.","method":"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA knockdown, xenograft","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP plus ubiquitination assay defines mechanistic interaction, but single lab and limited orthogonal validation","pmids":["38507923"],"is_preprint":false},{"year":2024,"finding":"NUF2 interacts with BUB3 (confirmed by Co-IP and mass spectrometry) and stabilizes it by preventing proteasomal degradation; NUF2 activates NF-κB signaling in a BUB3-dependent manner to promote lung adenocarcinoma progression.","method":"Co-immunoprecipitation, mass spectrometry, Western blot for BUB3 stability, transcriptomic sequencing, NF-κB pathway analysis, xenograft","journal":"World journal of surgical oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP/MS identifies interaction, mechanistic epistasis via BUB3 knockdown rescue, single lab","pmids":["41943078"],"is_preprint":false},{"year":2024,"finding":"NUF2 depletion epigenetically inhibits expression of magnesium transporters by reducing H3K4me3 at their promoters, thereby lowering intracellular Mg2+ concentration and suppressing PI3K/Akt/mTOR-mediated protein synthesis in anaplastic thyroid cancer cells.","method":"siRNA knockdown, ChIP for H3K4me3, intracellular Mg2+ measurement, PI3K/Akt/mTOR pathway Western blot, xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP establishes epigenetic mechanism, ion measurement provides functional link, single lab","pmids":["39242581"],"is_preprint":false},{"year":2024,"finding":"NUF2 promotes gastric cancer G2/M phase transition and inhibits apoptosis via the MAPK pathway; quercetin was identified as a selective NUF2 inhibitor by virtual docking and microscale thermophoresis, suppressing tumor growth in CDX, organoid, and PDX models.","method":"siRNA knockdown, live-cell time-lapse imaging, transcriptomics, flow cytometry, virtual docking, microscale thermophoresis, CDX/organoid/PDX models","journal":"Chinese medical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding measurement (MST) plus multiple functional models, single lab","pmids":["39193700"],"is_preprint":false},{"year":2024,"finding":"NUF2 is required for pre-rRNA transcription (the primary rate-limiting step of ribosome biogenesis) in human breast epithelial cells (MCF10A); siRNA depletion of NUF2 (and other NDC80 complex members NDC80, SPC24, SPC25) reduces levels of RNA polymerase I largest subunit POLR1A and activates the nucleolar stress pathway (elevated TP53 and p21 mRNAs, reversible by RPL5 co-depletion).","method":"Genome-wide siRNA screen validation, pre-rRNA transcription assays, Western blot for POLR1A, qRT-PCR for TP53/CDKN1A, RPL5 co-depletion epistasis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rigorous validation with multiple biochemical and cell-based assays, epistasis experiment; novel interphase function outside canonical kinetochore role, single lab","pmids":["39705402"],"is_preprint":false},{"year":2025,"finding":"Single Ndc80 complexes undergo processive, bi-directional sliding along microtubule walls; plus-end-directed forces induce a mobile catch-bond while forces away from the plus-end trigger slip-bond behavior; this dual behavior arises from force-dependent modulation of the Nuf2 calponin homology domain's microtubule binding, identifying Nuf2 as a friction regulator that enables the kinetochore's slip-clutch end-coupling mechanism.","method":"Ultrafast force-clamp spectroscopy (single-molecule), reconstituted Ndc80 complexes, domain-specific mutational analysis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — single-molecule reconstitution with force spectroscopy is Tier 1, but preprint with no peer review yet; single lab","pmids":["bio_10.1101_2025.03.13.643154"],"is_preprint":true},{"year":2025,"finding":"YY1 directly transcriptionally activates NUF2 by binding its promoter; NUF2 promotes prostate cancer progression by recruiting p38 and accelerating its phosphorylation, activating the p38/MAPK signaling pathway; fisetin was identified as a small-molecule NUF2 inhibitor that reverses NUF2-driven proliferation.","method":"ChIP, luciferase reporter assay, Co-immunoprecipitation for NUF2-p38, phospho-p38 Western blot, siRNA/overexpression rescue, in vivo xenograft","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP maps direct YY1-NUF2 promoter binding; Co-IP demonstrates NUF2-p38 interaction with functional phosphorylation readout; single lab","pmids":["40187571"],"is_preprint":false},{"year":2025,"finding":"NUF2 directly binds BUB1B (confirmed by co-immunoprecipitation) and promotes LUAD progression via BUB1B-mediated mTORC1 pathway activation (evidenced by phosphorylation of 4EBP1 and S6); BUB1B overexpression rescues anti-tumor effects of NUF2 knockdown.","method":"Co-immunoprecipitation, Western blot for mTORC1 substrates, siRNA knockdown and rescue, xenograft","journal":"Journal of thoracic disease","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP defines interaction, epistasis via BUB1B rescue confirms pathway order; single lab","pmids":["41229848"],"is_preprint":false},{"year":2025,"finding":"USP7 stabilizes NUF2 protein by mediating its deubiquitination (confirmed by immunoprecipitation and ubiquitination assay); NUF2 positively regulates SLC7A11 expression to suppress ferroptosis and promote ovarian cancer progression; USP7 depletion effects on cancer cells are mediated through NUF2 downregulation.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown epistasis, ferroptosis markers (Fe2+, ROS, MDA), xenograft","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — IP plus ubiquitination assay defines deubiquitination mechanism; epistasis links USP7-NUF2-SLC7A11 in order; single lab","pmids":["40582584"],"is_preprint":false}],"current_model":"NUF2 is a core subunit of the conserved NDC80 kinetochore complex that localizes to the outer kinetochore plate, where it heterodimerizes with Hec1/NDC80 via complementary coiled-coil interactions (three buried Glu-Lys pairs), and its calponin homology domain acts as a force-sensitive friction regulator for microtubule sliding; NUF2 is required for kinetochore-microtubule attachment, interkinetochore tension, spindle assembly checkpoint maintenance (retaining Mad1/Mad2), and CENP-E kinetochore localization (through poly-SUMO-2/3 chain modification that enhances binding to CENP-E's SIM); beyond its canonical mitotic role, NUF2 is also required for pre-rRNA transcription and nucleolar homeostasis during interphase, and in cancer contexts engages multiple signaling cascades (PI3K/AKT/mTOR, p38/MAPK, NF-κB) through interactions with ERBB3, BUB3, BUB1B, and HNRNPA2B1, and is transcriptionally activated by FOXM1 and YY1."},"narrative":{"mechanistic_narrative":"NUF2 is an evolutionarily conserved kinetochore protein that forms the structural core required for chromosome segregation, originally identified as a spindle pole body-associated protein essential for nuclear division in budding yeast [PMID:8188751] and shown across fission yeast and vertebrates to be required for centromere-spindle connection and spindle assembly checkpoint signaling [PMID:11685532, PMID:12829748]. It heterodimerizes stably with Hec1/NDC80 throughout the cell cycle—an interaction built on three buried Hec1 glutamate residues that form complementary ionic pairs with three Nuf2 lysines, such that disruption of either set destabilizes the NDC80 complex and blocks mitosis [PMID:24129578]—and localizes to the outer plate of the kinetochore where it constitutes a stable structural element distinct from dynamic checkpoint and motor proteins [PMID:15548592]. NUF2/Hec1 are required to maintain kinetochore-microtubule attachment and to retain Mad1/Mad2 at kinetochores against microtubule-dependent stripping [PMID:14654001]. The NUF2 calponin homology domain is dispensable for initial attachment but required to generate interkinetochore tension [PMID:21270439], and at the single-molecule level acts as a force-dependent friction regulator governing the slip-clutch behavior of NDC80 sliding along microtubules [PMID:bio_10.1101_2025.03.13.643154]. NUF2 also recruits CENP-E to kinetochores, both through a direct C-terminal interaction and through poly-SUMO-2/3 chain modification that enhances binding to the CENP-E SUMO-interacting motif [PMID:17535814, PMID:33910471]. Beyond mitosis, NUF2 (with other NDC80 subunits) is required for pre-rRNA transcription and suppression of nucleolar stress during interphase [PMID:39705402]. A de novo missense variant in the CH domain destabilizes the NUF2-NDC80 complex and causes a developmental syndrome with microcephaly and short stature [PMID:33721060]. In cancer, NUF2 is transcriptionally activated by FOXM1 and YY1 and engages proliferative and survival signaling through interactions with multiple partners [PMID:35701983, PMID:40187571].","teleology":[{"year":1994,"claim":"Established NUF2 as a conserved spindle pole body-associated protein required for nuclear division, framing it as a mitotic apparatus component rather than a soluble factor.","evidence":"Coimmunofluorescence with SPB markers, temperature-sensitive mutagenesis and biochemical fractionation in budding yeast","pmids":["8188751"],"confidence":"High","gaps":["Molecular partners at the SPB undefined","No direct microtubule or centromere mechanism established"]},{"year":2001,"claim":"Distinguished NUF2's two functions—centromere-microtubule attachment and checkpoint signaling—by showing null and ts alleles separate spindle elongation from chromosome segregation and Mad2-dependent arrest.","evidence":"Gene disruption, ts alleles, and mad2 epistasis with live imaging in fission yeast","pmids":["11685532"],"confidence":"High","gaps":["Biochemical basis of attachment vs. checkpoint roles unresolved","Vertebrate generality not yet shown"]},{"year":2003,"claim":"Defined the stable Nuf2-Hec1 complex and its outer-kinetochore requirement for retaining checkpoint proteins, showing NUF2 prevents microtubule-dependent stripping of Mad1/Mad2.","evidence":"GFP live imaging, conditional knockout and FRAP in DT40 cells; RNAi with spindle-depolymerization rescue in HeLa","pmids":["12829748","14654001"],"confidence":"High","gaps":["Direct microtubule-binding mechanism not yet mapped","Stoichiometry of the full NDC80 complex not addressed here"]},{"year":2004,"claim":"Localized NUF2/Hec1 to the kinetochore outer plate as a stable structural core required for outer-plate formation and microtubule attachment, separating it from dynamic corona components.","evidence":"Light and electron microscopy with quantitative RNAi analysis in vertebrate cells","pmids":["15548592"],"confidence":"High","gaps":["Atomic structure of the attachment interface unknown","How force is transmitted through the plate undefined"]},{"year":2005,"claim":"Showed the Nuf2-Ndc80 complex physically connects centromeres to the SPB and links it to inner kinetochore via CENP-H, establishing NUF2 as a bridge across the kinetochore.","evidence":"Meiotic live imaging with genetic epistasis in fission yeast; yeast two-hybrid and Co-IP with CENP-H in DT40","pmids":["15728720","15713649"],"confidence":"High","gaps":["Direct vs. indirect nature of the CENP-H linkage in vertebrates not fully resolved","Regulation of complex removal by pheromone signaling mechanistically incomplete"]},{"year":2007,"claim":"Identified NUF2 as required for CENP-E kinetochore localization and tension generation through a direct C-terminal interaction, connecting the structural core to a kinetochore motor.","evidence":"GST pulldown, yeast two-hybrid, siRNA, and tension measurement in human cells","pmids":["17535814"],"confidence":"High","gaps":["Whether interaction is direct in cells or scaffold-mediated not fully resolved","Regulation of the interaction unknown at this stage"]},{"year":2011,"claim":"Dissected the NUF2 calponin homology domain function, showing it is dispensable for initial attachment but required for full interkinetochore tension—separating attachment stability from force generation.","evidence":"siRNA-and-rescue structure-function mutagenesis with live imaging and interkinetochore distance assays","pmids":["21270439"],"confidence":"High","gaps":["Biophysical mechanism of tension generation not addressed","How the CH domain engages microtubules unresolved"]},{"year":2013,"claim":"Defined the structural basis of Hec1-Nuf2 heterodimerization at residue resolution, identifying three ionic pairs whose disruption destabilizes the NDC80 complex and blocks mitosis.","evidence":"Co-IP, domain mapping and alanine-scanning mutagenesis with cell-based mitotic assays","pmids":["24129578"],"confidence":"High","gaps":["No crystal structure of the full dimer reported here","Effects on downstream Spc24/Spc25 assembly not detailed"]},{"year":2015,"claim":"Extended NUF2 function to meiosis and identified its transcriptional control, showing precise dosage is required for oocyte chromosome alignment and that hnRNP K directly transactivates NUF2.","evidence":"mRNA injection, morpholino knockdown and immunofluorescence in mouse oocytes; ChIP and reporter assay with siRNA in cells","pmids":["26054848","25701787"],"confidence":"Medium","gaps":["Meiosis-specific regulators of NUF2 undefined","hnRNP K regulation tested in a single lineage"]},{"year":2021,"claim":"Revealed a post-translational mechanism for CENP-E recruitment—mitotic poly-SUMO-2/3 chain modification of NUF2 enhances binding to the CENP-E SIM in a chain-length- and SUMO-type-specific manner.","evidence":"SUMO modification assays, Nuf2-SUMO/Ubc9 fusion rescue with SIM-mutant controls and binding affinity assays","pmids":["33910471"],"confidence":"High","gaps":["SUMO ligase and acceptor lysines on NUF2 not pinpointed","Temporal dynamics of de-SUMOylation undefined"]},{"year":2021,"claim":"Linked NUF2 to human disease, showing a de novo CH-domain missense variant destabilizes the NUF2-NDC80 complex and produces aneuploidy and a developmental syndrome.","evidence":"Whole-exome sequencing with patient lymphoblastoid cell Western blot and chromosome/spindle analysis","pmids":["33721060"],"confidence":"Medium","gaps":["Single case limits genotype-phenotype generality","Tissue-specific basis of microcephaly phenotype unexplained"]},{"year":2024,"claim":"Uncovered an interphase, non-mitotic role: NUF2 and other NDC80 subunits are required for pre-rRNA transcription and suppression of nucleolar stress.","evidence":"siRNA validation, pre-rRNA assays, POLR1A Western blot and RPL5 co-depletion epistasis in MCF10A cells","pmids":["39705402"],"confidence":"Medium","gaps":["Molecular link between NUF2 and Pol I machinery unknown","Whether this requires the NDC80 complex or a separate NUF2 pool unresolved"]},{"year":2024,"claim":"Mapped NUF2 into oncogenic signaling, showing it is transcriptionally activated by FOXM1/YY1 and stabilizes or engages multiple partners to drive proliferation and survival across cancer types.","evidence":"ChIP/reporter assays, Co-IP, ubiquitination assays and pathway Western blots with rescue across glioma, ovarian, cholangiocarcinoma, HCC, LUAD, thyroid, gastric and prostate models","pmids":["35701983","40187571","36670423","37056930","38507923","41943078","39242581","39193700","41229848","40582584"],"confidence":"Medium","gaps":["Mechanistic relationship between NUF2's kinetochore role and signaling functions unclear","Most interactions validated in single labs without reciprocal/structural confirmation","Whether signaling is direct or a consequence of proliferation not always separable"]},{"year":2025,"claim":"Provided the biophysical basis of the NUF2 CH domain's tension role, showing it acts as a force-dependent friction regulator enabling NDC80 slip-clutch microtubule end-coupling.","evidence":"Ultrafast force-clamp single-molecule spectroscopy on reconstituted Ndc80 complexes with domain mutants (preprint)","pmids":["bio_10.1101_2025.03.13.643154"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Behavior in the assembled kinetochore in cells not demonstrated"]},{"year":null,"claim":"How NUF2's canonical kinetochore/microtubule function mechanistically connects to its interphase nucleolar role and its reported cancer signaling activities remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking mitotic, nucleolar, and signaling functions","Direct vs. indirect nature of many cancer-context interactions undefined","No high-resolution structure of the human NDC80 complex on microtubules in the timeline"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9,24]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[4,11]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,8]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[2,4]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[23]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,3,11]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[19,25,26]}],"complexes":["NDC80 complex","kinetochore"],"partners":["NDC80","CENP-E","CENP-H","ERBB3","BUB3","BUB1B","HNRNPA2B1","USP7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BZD4","full_name":"Kinetochore protein Nuf2","aliases":["Cell division cycle-associated protein 1"],"length_aa":464,"mass_kda":54.3,"function":"Acts as a component of the essential kinetochore-associated NDC80 complex, which is required for chromosome segregation and spindle checkpoint activity (PubMed:12438418, PubMed:14654001, PubMed:15062103, PubMed:15235793, PubMed:15239953, PubMed:15548592, PubMed:17535814). Required for kinetochore integrity and the organization of stable microtubule binding sites in the outer plate of the kinetochore (PubMed:15548592). 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spindle pole body (SPB)-associated protein in budding yeast required for nuclear division; temperature-sensitive alleles cause arrest with a short mitotic spindle and undivided nucleus, and anti-Nuf2 antibodies cross-react with a mammalian centrosome-associated protein, suggesting conserved function.\",\n      \"method\": \"Coimmunofluorescence with SPB markers, temperature-sensitive mutagenesis, fractionation (salt/detergent/urea extraction)\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetic loss-of-function, coimmunofluorescence, biochemical fractionation) in foundational study, independently replicated in later work\",\n      \"pmids\": [\"8188751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Nuf2 in fission yeast (S. pombe) is required for centromere-spindle connection and for the spindle assembly checkpoint; nuf2 null cells show spindle elongation without chromosome segregation, while certain ts alleles cause Mad2-dependent metaphase arrest, demonstrating Nuf2 is needed for both microtubule attachment and checkpoint signaling at the centromere.\",\n      \"method\": \"Gene disruption, temperature-sensitive allele analysis, epistasis with mad2 deletion, live cell microscopy\",\n      \"journal\": \"Chromosoma\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with epistasis (Mad2-dependent arrest), multiple alleles, replicated across organisms\",\n      \"pmids\": [\"11685532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nuf2 forms a stable complex with Hec1 throughout the cell cycle in vertebrate (chicken DT40) cells, localizing to centrosomes during G1/S and relocating to centromeres in G2/mitosis; conditional loss of either subunit causes prometaphase arrest, abolishes Mad2 kinetochore localization, and FRAP shows the complex is stably associated with centromeres during mitosis while its centrosome interaction is dynamic.\",\n      \"method\": \"GFP fusion live imaging, conditional knockout (DT40), FRAP, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with FRAP, conditional KO with defined mitotic phenotype, replicated across systems\",\n      \"pmids\": [\"12829748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RNAi depletion of Nuf2 or Hec1 in HeLa cells reduces both proteins at kinetochores and causes progressive, microtubule-dependent depletion of Mad1 and Mad2 from kinetochores during prometaphase; spindle depolymerization restores Mad1/Mad2 levels, supporting a model where Nuf2/Hec1 prevent microtubule-dependent stripping of checkpoint proteins.\",\n      \"method\": \"RNAi (siRNA) knockdown, quantitative immunofluorescence, spindle depolymerization rescue experiment\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi with defined phenotypic readout, reversibility experiment, replicated across two independent RNAi studies in HeLa cells\",\n      \"pmids\": [\"14654001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Nuf2 and Hec1 localize throughout the outer plate (not the corona) of the vertebrate kinetochore, form a stable structural core distinct from dynamic checkpoint/motor proteins, and are required for formation and maintenance of the outer plate structure and for normal kinetochore microtubule attachment.\",\n      \"method\": \"Fluorescence light microscopy, live cell imaging, electron microscopy, RNAi knockdown with quantitative EM analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including electron microscopy with quantitative data, direct structural localization with functional consequence\",\n      \"pmids\": [\"15548592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The Nuf2-Ndc80 complex (including Nuf2, Ndc80, Spc24, Spc25) disappears from centromeres during meiotic prophase in fission yeast coinciding with centromere-SPB dissociation; inactivation of Nuf2 by mutation causes premature centromere-SPB release, demonstrating that the Nuf2-Ndc80 complex physically connects centromeres to the SPB and that mating pheromone signaling triggers complex removal for meiotic kinetochore remodeling.\",\n      \"method\": \"Live cell imaging of GFP-tagged proteins in meiotic cells, genetic loss-of-function (nuf2 temperature-sensitive mutation), epistasis with pat1 mutant\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct live imaging combined with genetic epistasis, multiple conditions tested\",\n      \"pmids\": [\"15728720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The functional region of CENP-H interacts directly with Hec1 (a member of the Nuf2 complex) as demonstrated by yeast two-hybrid and coimmunoprecipitation in chicken DT40 cells; the Nuf2 complex is proposed to act as a connector between inner (CENP-H side) and outer kinetochore during mitosis.\",\n      \"method\": \"Yeast two-hybrid, coimmunoprecipitation, conditional loss-of-function mutant, FRAP\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP confirming yeast two-hybrid interaction, FRAP for dynamics, single lab\",\n      \"pmids\": [\"15713649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CDCA1 (NUF2) forms a complex with KNTC2 (Hec1/NDC80); a cell-permeable 19-amino-acid peptide derived from the CDCA1 binding domain to KNTC2 (residues 398–416) disrupts complex formation and suppresses lung cancer cell growth, mapping the interaction interface of the CDCA1-KNTC2 dimer.\",\n      \"method\": \"Cell-permeable peptide competition assay, siRNA knockdown, cell growth assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — peptide competition assay maps binding domain, supported by functional growth suppression, but no direct structural/biochemical reconstitution\",\n      \"pmids\": [\"17079454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human NUF2 is required for stable kinetochore localization of CENP-E; NUF2 physically interacts with the C-terminal domain of CENP-E via its own C-terminal domain (mapped by GST pulldown and yeast two-hybrid); siRNA depletion of NUF2 abolishes CENP-E kinetochore localization and reduces kinetochore tension, with double knockdown of CENP-E and NUF2 further eliminating tension.\",\n      \"method\": \"GST pulldown, yeast two-hybrid, siRNA knockdown, immunofluorescence, tension measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pulldown plus yeast two-hybrid mapping interaction domain, functional siRNA with defined mechanistic readout (CENP-E localization and kinetochore tension), single lab with two orthogonal binding methods\",\n      \"pmids\": [\"17535814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The calponin homology (CH) domains of both Hec1 and Nuf2 contribute to kinetochore-microtubule attachment, but in distinct ways: Hec1 CH domain mutants show the most severe attachment defects; Nuf2 CH domain mutants generate stable kinetochore-microtubule attachments but fail to produce wild-type interkinetochore tension and delay anaphase onset, indicating the Nuf2 CH domain is dispensable for initial attachment but required for tension generation.\",\n      \"method\": \"Gene silencing and rescue (siRNA + re-expression of mutant constructs), live cell imaging, kinetochore-microtubule attachment assays, interkinetochore distance measurement\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structure-function mutagenesis with rescue approach, multiple functional readouts, single lab but rigorous design\",\n      \"pmids\": [\"21270439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PTPIP51 interacts with Nuf2 (and CGI-99) in vitro and in vivo; the PTPIP51/Nuf2 complex localizes to the equatorial region during mitosis, as shown by Duolink proximity ligation assays and confocal microscopy.\",\n      \"method\": \"In vitro binding, in vivo colocalization, Duolink proximity ligation assay, confocal microscopy\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, proximity ligation assay only; functional significance of the interaction not fully resolved\",\n      \"pmids\": [\"24970130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hec1-Nuf2 heterodimerization requires three contiguous heptad repeats (Leu-324 to Leu-352) of Hec1; three buried glutamic acid residues (Glu-334, Glu-341, Glu-348) in Hec1 form complementary ionic pairs with three Nuf2 lysine residues (Lys-227, Lys-234, Lys-241); alanine substitution of either set disrupts the dimer, destabilizes the NDC80 complex, and blocks mitotic progression.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, alanine-scanning mutagenesis, cell-based mitotic progression assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis of specific residues at the dimerization interface combined with co-IP and functional mitosis assays, defining structural basis of Hec1-Nuf2 interaction\",\n      \"pmids\": [\"24129578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nuf2 localizes to kinetochores from germinal vesicle breakdown through metaphase I in mouse oocytes, disappears at anaphase I, and reappears at MII; overexpression causes defective spindles, chromosome misalignment, and spindle checkpoint activation blocking meiotic progression, while Nuf2 knockdown causes premature polar body extrusion with misaligned chromosomes and aneuploidy.\",\n      \"method\": \"mRNA injection, immunofluorescence, morpholino knockdown, flow cytometry for spindle checkpoint\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments combined with gain- and loss-of-function in oocyte meiosis with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"26054848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"hnRNP K directly transactivates the NUF2 gene; hnRNP K knockdown reduces NUF2 expression and causes failure in metaphase chromosome alignment, linking hnRNP K to kinetochore function via NUF2 transcriptional regulation.\",\n      \"method\": \"ChIP (chromatin immunoprecipitation), reporter assay, siRNA knockdown, immunofluorescence for chromosome alignment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct transcriptional regulation of NUF2 by hnRNP K, functional knockdown with defined mitotic phenotype, single lab\",\n      \"pmids\": [\"25701787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nuf2 is preferentially modified by poly-SUMO-2/3 chains during mitosis; this modification is required for CENP-E kinetochore localization and chromosome congression. A Nuf2-Ubc9 fusion (to stimulate SUMO modification) or a Nuf2–SUMO-2 trimer fusion rescues CENP-E localization defects caused by global sumoylation inhibition, while Nuf2 fused to SUMO-2 monomer, dimer, or SUMO-1 trimer cannot. The SUMO-2/3-trimeric chain-modified Nuf2 binds CENP-E with higher affinity through CENP-E's SUMO-interacting motif (SIM).\",\n      \"method\": \"SUMO modification assays, Nuf2-SUMO/Ubc9 fusion rescue experiments, binding affinity assays (CENP-E SIM mutant controls), immunofluorescence\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal rescue constructs with defined controls (SIM mutant), mechanistic dissection of chain-length and type specificity, single lab with rigorous structure-function approach\",\n      \"pmids\": [\"33910471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A de novo missense variant in NUF2 (affecting the calponin homology domain at the N-terminus, which interfaces with NDC80) causes markedly reduced protein levels of both NUF2 and NDC80, aneuploidy, increased micronuclei, and spindle abnormalities in patient-derived lymphoblastoid cells, demonstrating that NUF2 CH domain integrity is required for NDC80 complex stability in human cells and that NUF2 loss-of-function causes a developmental syndrome (microcephaly, short stature).\",\n      \"method\": \"Whole-exome sequencing, patient-derived lymphoblastoid cell analysis, Western blot for NUF2 and NDC80 levels, chromosome and spindle analysis\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — patient variant functionally validated in primary cells with defined molecular readout (complex instability), single case study\",\n      \"pmids\": [\"33721060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FOXM1 transcriptionally activates NUF2 by binding to its promoter (mapped by luciferase reporter assays and ChIP); FOXM1-induced proliferation of glioma TMZ-resistant cells is dependent on elevated NUF2 expression, as NUF2 knockdown abolishes the FOXM1-mediated proliferative phenotype.\",\n      \"method\": \"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), siRNA knockdown, rescue experiments\",\n      \"journal\": \"Neuropathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay establish direct transcriptional regulation; epistasis (rescue) confirms dependency, single lab\",\n      \"pmids\": [\"35701983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NUF2 interacts with HNRNPA2B1 (identified by immunoprecipitation/mass spectrometry) and activates the PI3K/AKT/mTOR signaling pathway in ovarian cancer cells; HNRNPA2B1 silencing reduces NUF2 expression, placing HNRNPA2B1 upstream of NUF2.\",\n      \"method\": \"Immunoprecipitation/mass spectrometry, Co-IP, siRNA knockdown, Western blot for PI3K/AKT/mTOR pathway components\",\n      \"journal\": \"Journal of ovarian research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — IP/MS identifies interaction, Co-IP confirms, pathway activation assessed by Western blot; single lab, no reconstitution\",\n      \"pmids\": [\"36670423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NUF2 promotes cholangiocarcinoma progression through the p38/MAPK signaling pathway by inhibiting p62-mediated autophagic degradation of transferrin receptor 1 (TFR1); NUF2 knockdown reduces TFR1 protein levels and impairs p38/MAPK activation.\",\n      \"method\": \"siRNA knockdown, Western blot, autophagy assays, Co-IP for p62-TFR1 interaction, xenograft models\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mechanistic pathway dissection with Co-IP and rescue assays, single lab\",\n      \"pmids\": [\"37056930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUF2 interacts with ERBB3 in hepatocellular carcinoma cells and inhibits ERBB3 ubiquitination-mediated degradation, thereby stabilizing ERBB3 protein levels and activating the PI3K/AKT signaling pathway to regulate cell cycle progression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA knockdown, xenograft\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP plus ubiquitination assay defines mechanistic interaction, but single lab and limited orthogonal validation\",\n      \"pmids\": [\"38507923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUF2 interacts with BUB3 (confirmed by Co-IP and mass spectrometry) and stabilizes it by preventing proteasomal degradation; NUF2 activates NF-κB signaling in a BUB3-dependent manner to promote lung adenocarcinoma progression.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, Western blot for BUB3 stability, transcriptomic sequencing, NF-κB pathway analysis, xenograft\",\n      \"journal\": \"World journal of surgical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP/MS identifies interaction, mechanistic epistasis via BUB3 knockdown rescue, single lab\",\n      \"pmids\": [\"41943078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUF2 depletion epigenetically inhibits expression of magnesium transporters by reducing H3K4me3 at their promoters, thereby lowering intracellular Mg2+ concentration and suppressing PI3K/Akt/mTOR-mediated protein synthesis in anaplastic thyroid cancer cells.\",\n      \"method\": \"siRNA knockdown, ChIP for H3K4me3, intracellular Mg2+ measurement, PI3K/Akt/mTOR pathway Western blot, xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP establishes epigenetic mechanism, ion measurement provides functional link, single lab\",\n      \"pmids\": [\"39242581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUF2 promotes gastric cancer G2/M phase transition and inhibits apoptosis via the MAPK pathway; quercetin was identified as a selective NUF2 inhibitor by virtual docking and microscale thermophoresis, suppressing tumor growth in CDX, organoid, and PDX models.\",\n      \"method\": \"siRNA knockdown, live-cell time-lapse imaging, transcriptomics, flow cytometry, virtual docking, microscale thermophoresis, CDX/organoid/PDX models\",\n      \"journal\": \"Chinese medical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding measurement (MST) plus multiple functional models, single lab\",\n      \"pmids\": [\"39193700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUF2 is required for pre-rRNA transcription (the primary rate-limiting step of ribosome biogenesis) in human breast epithelial cells (MCF10A); siRNA depletion of NUF2 (and other NDC80 complex members NDC80, SPC24, SPC25) reduces levels of RNA polymerase I largest subunit POLR1A and activates the nucleolar stress pathway (elevated TP53 and p21 mRNAs, reversible by RPL5 co-depletion).\",\n      \"method\": \"Genome-wide siRNA screen validation, pre-rRNA transcription assays, Western blot for POLR1A, qRT-PCR for TP53/CDKN1A, RPL5 co-depletion epistasis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rigorous validation with multiple biochemical and cell-based assays, epistasis experiment; novel interphase function outside canonical kinetochore role, single lab\",\n      \"pmids\": [\"39705402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Single Ndc80 complexes undergo processive, bi-directional sliding along microtubule walls; plus-end-directed forces induce a mobile catch-bond while forces away from the plus-end trigger slip-bond behavior; this dual behavior arises from force-dependent modulation of the Nuf2 calponin homology domain's microtubule binding, identifying Nuf2 as a friction regulator that enables the kinetochore's slip-clutch end-coupling mechanism.\",\n      \"method\": \"Ultrafast force-clamp spectroscopy (single-molecule), reconstituted Ndc80 complexes, domain-specific mutational analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — single-molecule reconstitution with force spectroscopy is Tier 1, but preprint with no peer review yet; single lab\",\n      \"pmids\": [\"bio_10.1101_2025.03.13.643154\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"YY1 directly transcriptionally activates NUF2 by binding its promoter; NUF2 promotes prostate cancer progression by recruiting p38 and accelerating its phosphorylation, activating the p38/MAPK signaling pathway; fisetin was identified as a small-molecule NUF2 inhibitor that reverses NUF2-driven proliferation.\",\n      \"method\": \"ChIP, luciferase reporter assay, Co-immunoprecipitation for NUF2-p38, phospho-p38 Western blot, siRNA/overexpression rescue, in vivo xenograft\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP maps direct YY1-NUF2 promoter binding; Co-IP demonstrates NUF2-p38 interaction with functional phosphorylation readout; single lab\",\n      \"pmids\": [\"40187571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NUF2 directly binds BUB1B (confirmed by co-immunoprecipitation) and promotes LUAD progression via BUB1B-mediated mTORC1 pathway activation (evidenced by phosphorylation of 4EBP1 and S6); BUB1B overexpression rescues anti-tumor effects of NUF2 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for mTORC1 substrates, siRNA knockdown and rescue, xenograft\",\n      \"journal\": \"Journal of thoracic disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP defines interaction, epistasis via BUB1B rescue confirms pathway order; single lab\",\n      \"pmids\": [\"41229848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP7 stabilizes NUF2 protein by mediating its deubiquitination (confirmed by immunoprecipitation and ubiquitination assay); NUF2 positively regulates SLC7A11 expression to suppress ferroptosis and promote ovarian cancer progression; USP7 depletion effects on cancer cells are mediated through NUF2 downregulation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown epistasis, ferroptosis markers (Fe2+, ROS, MDA), xenograft\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — IP plus ubiquitination assay defines deubiquitination mechanism; epistasis links USP7-NUF2-SLC7A11 in order; single lab\",\n      \"pmids\": [\"40582584\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUF2 is a core subunit of the conserved NDC80 kinetochore complex that localizes to the outer kinetochore plate, where it heterodimerizes with Hec1/NDC80 via complementary coiled-coil interactions (three buried Glu-Lys pairs), and its calponin homology domain acts as a force-sensitive friction regulator for microtubule sliding; NUF2 is required for kinetochore-microtubule attachment, interkinetochore tension, spindle assembly checkpoint maintenance (retaining Mad1/Mad2), and CENP-E kinetochore localization (through poly-SUMO-2/3 chain modification that enhances binding to CENP-E's SIM); beyond its canonical mitotic role, NUF2 is also required for pre-rRNA transcription and nucleolar homeostasis during interphase, and in cancer contexts engages multiple signaling cascades (PI3K/AKT/mTOR, p38/MAPK, NF-κB) through interactions with ERBB3, BUB3, BUB1B, and HNRNPA2B1, and is transcriptionally activated by FOXM1 and YY1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NUF2 is an evolutionarily conserved kinetochore protein that forms the structural core required for chromosome segregation, originally identified as a spindle pole body-associated protein essential for nuclear division in budding yeast [#0] and shown across fission yeast and vertebrates to be required for centromere-spindle connection and spindle assembly checkpoint signaling [#1, #2]. It heterodimerizes stably with Hec1/NDC80 throughout the cell cycle—an interaction built on three buried Hec1 glutamate residues that form complementary ionic pairs with three Nuf2 lysines, such that disruption of either set destabilizes the NDC80 complex and blocks mitosis [#11]—and localizes to the outer plate of the kinetochore where it constitutes a stable structural element distinct from dynamic checkpoint and motor proteins [#4]. NUF2/Hec1 are required to maintain kinetochore-microtubule attachment and to retain Mad1/Mad2 at kinetochores against microtubule-dependent stripping [#3]. The NUF2 calponin homology domain is dispensable for initial attachment but required to generate interkinetochore tension [#9], and at the single-molecule level acts as a force-dependent friction regulator governing the slip-clutch behavior of NDC80 sliding along microtubules [#24]. NUF2 also recruits CENP-E to kinetochores, both through a direct C-terminal interaction and through poly-SUMO-2/3 chain modification that enhances binding to the CENP-E SUMO-interacting motif [#8, #14]. Beyond mitosis, NUF2 (with other NDC80 subunits) is required for pre-rRNA transcription and suppression of nucleolar stress during interphase [#23]. A de novo missense variant in the CH domain destabilizes the NUF2-NDC80 complex and causes a developmental syndrome with microcephaly and short stature [#15]. In cancer, NUF2 is transcriptionally activated by FOXM1 and YY1 and engages proliferative and survival signaling through interactions with multiple partners [#16, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established NUF2 as a conserved spindle pole body-associated protein required for nuclear division, framing it as a mitotic apparatus component rather than a soluble factor.\",\n      \"evidence\": \"Coimmunofluorescence with SPB markers, temperature-sensitive mutagenesis and biochemical fractionation in budding yeast\",\n      \"pmids\": [\"8188751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners at the SPB undefined\", \"No direct microtubule or centromere mechanism established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Distinguished NUF2's two functions—centromere-microtubule attachment and checkpoint signaling—by showing null and ts alleles separate spindle elongation from chromosome segregation and Mad2-dependent arrest.\",\n      \"evidence\": \"Gene disruption, ts alleles, and mad2 epistasis with live imaging in fission yeast\",\n      \"pmids\": [\"11685532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical basis of attachment vs. checkpoint roles unresolved\", \"Vertebrate generality not yet shown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the stable Nuf2-Hec1 complex and its outer-kinetochore requirement for retaining checkpoint proteins, showing NUF2 prevents microtubule-dependent stripping of Mad1/Mad2.\",\n      \"evidence\": \"GFP live imaging, conditional knockout and FRAP in DT40 cells; RNAi with spindle-depolymerization rescue in HeLa\",\n      \"pmids\": [\"12829748\", \"14654001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct microtubule-binding mechanism not yet mapped\", \"Stoichiometry of the full NDC80 complex not addressed here\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Localized NUF2/Hec1 to the kinetochore outer plate as a stable structural core required for outer-plate formation and microtubule attachment, separating it from dynamic corona components.\",\n      \"evidence\": \"Light and electron microscopy with quantitative RNAi analysis in vertebrate cells\",\n      \"pmids\": [\"15548592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the attachment interface unknown\", \"How force is transmitted through the plate undefined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed the Nuf2-Ndc80 complex physically connects centromeres to the SPB and links it to inner kinetochore via CENP-H, establishing NUF2 as a bridge across the kinetochore.\",\n      \"evidence\": \"Meiotic live imaging with genetic epistasis in fission yeast; yeast two-hybrid and Co-IP with CENP-H in DT40\",\n      \"pmids\": [\"15728720\", \"15713649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. indirect nature of the CENP-H linkage in vertebrates not fully resolved\", \"Regulation of complex removal by pheromone signaling mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified NUF2 as required for CENP-E kinetochore localization and tension generation through a direct C-terminal interaction, connecting the structural core to a kinetochore motor.\",\n      \"evidence\": \"GST pulldown, yeast two-hybrid, siRNA, and tension measurement in human cells\",\n      \"pmids\": [\"17535814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether interaction is direct in cells or scaffold-mediated not fully resolved\", \"Regulation of the interaction unknown at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Dissected the NUF2 calponin homology domain function, showing it is dispensable for initial attachment but required for full interkinetochore tension—separating attachment stability from force generation.\",\n      \"evidence\": \"siRNA-and-rescue structure-function mutagenesis with live imaging and interkinetochore distance assays\",\n      \"pmids\": [\"21270439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biophysical mechanism of tension generation not addressed\", \"How the CH domain engages microtubules unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the structural basis of Hec1-Nuf2 heterodimerization at residue resolution, identifying three ionic pairs whose disruption destabilizes the NDC80 complex and blocks mitosis.\",\n      \"evidence\": \"Co-IP, domain mapping and alanine-scanning mutagenesis with cell-based mitotic assays\",\n      \"pmids\": [\"24129578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of the full dimer reported here\", \"Effects on downstream Spc24/Spc25 assembly not detailed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended NUF2 function to meiosis and identified its transcriptional control, showing precise dosage is required for oocyte chromosome alignment and that hnRNP K directly transactivates NUF2.\",\n      \"evidence\": \"mRNA injection, morpholino knockdown and immunofluorescence in mouse oocytes; ChIP and reporter assay with siRNA in cells\",\n      \"pmids\": [\"26054848\", \"25701787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Meiosis-specific regulators of NUF2 undefined\", \"hnRNP K regulation tested in a single lineage\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a post-translational mechanism for CENP-E recruitment—mitotic poly-SUMO-2/3 chain modification of NUF2 enhances binding to the CENP-E SIM in a chain-length- and SUMO-type-specific manner.\",\n      \"evidence\": \"SUMO modification assays, Nuf2-SUMO/Ubc9 fusion rescue with SIM-mutant controls and binding affinity assays\",\n      \"pmids\": [\"33910471\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO ligase and acceptor lysines on NUF2 not pinpointed\", \"Temporal dynamics of de-SUMOylation undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked NUF2 to human disease, showing a de novo CH-domain missense variant destabilizes the NUF2-NDC80 complex and produces aneuploidy and a developmental syndrome.\",\n      \"evidence\": \"Whole-exome sequencing with patient lymphoblastoid cell Western blot and chromosome/spindle analysis\",\n      \"pmids\": [\"33721060\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single case limits genotype-phenotype generality\", \"Tissue-specific basis of microcephaly phenotype unexplained\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Uncovered an interphase, non-mitotic role: NUF2 and other NDC80 subunits are required for pre-rRNA transcription and suppression of nucleolar stress.\",\n      \"evidence\": \"siRNA validation, pre-rRNA assays, POLR1A Western blot and RPL5 co-depletion epistasis in MCF10A cells\",\n      \"pmids\": [\"39705402\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between NUF2 and Pol I machinery unknown\", \"Whether this requires the NDC80 complex or a separate NUF2 pool unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped NUF2 into oncogenic signaling, showing it is transcriptionally activated by FOXM1/YY1 and stabilizes or engages multiple partners to drive proliferation and survival across cancer types.\",\n      \"evidence\": \"ChIP/reporter assays, Co-IP, ubiquitination assays and pathway Western blots with rescue across glioma, ovarian, cholangiocarcinoma, HCC, LUAD, thyroid, gastric and prostate models\",\n      \"pmids\": [\"35701983\", \"40187571\", \"36670423\", \"37056930\", \"38507923\", \"41943078\", \"39242581\", \"39193700\", \"41229848\", \"40582584\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic relationship between NUF2's kinetochore role and signaling functions unclear\", \"Most interactions validated in single labs without reciprocal/structural confirmation\", \"Whether signaling is direct or a consequence of proliferation not always separable\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided the biophysical basis of the NUF2 CH domain's tension role, showing it acts as a force-dependent friction regulator enabling NDC80 slip-clutch microtubule end-coupling.\",\n      \"evidence\": \"Ultrafast force-clamp single-molecule spectroscopy on reconstituted Ndc80 complexes with domain mutants (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.03.13.643154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Behavior in the assembled kinetochore in cells not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NUF2's canonical kinetochore/microtubule function mechanistically connects to its interphase nucleolar role and its reported cancer signaling activities remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking mitotic, nucleolar, and signaling functions\", \"Direct vs. indirect nature of many cancer-context interactions undefined\", \"No high-resolution structure of the human NDC80 complex on microtubules in the timeline\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9, 24]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [4, 11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 3, 11]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [19, 25, 26]}\n    ],\n    \"complexes\": [\"NDC80 complex\", \"kinetochore\"],\n    \"partners\": [\"NDC80\", \"CENP-E\", \"CENP-H\", \"ERBB3\", \"BUB3\", \"BUB1B\", \"HNRNPA2B1\", \"USP7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}