{"gene":"ZW10","run_date":"2026-06-11T09:02:07","timeline":{"discoveries":[{"year":1992,"finding":"The ZW10 protein (85 kDa) displays cell cycle-dependent localization: excluded from nuclei during interphase, migrates into the nuclear zone at prometaphase, associates with a filamentous structure (possibly kinetochore microtubules) at metaphase, and undergoes rapid redistribution to kinetochore regions at anaphase onset. Loss-of-function causes lagging chromosomes and broken centromeric connections in colchicine-treated cells.","method":"Immunofluorescence microscopy, mutant analysis in Drosophila larval brain neuroblasts","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments with functional phenotype, replicated across multiple cell types and tissues","pmids":["1339459"],"is_preprint":false},{"year":1994,"finding":"ZW10 protein localization at kinetochores is dependent on the rough deal and abnormal anaphase resolution gene products, indicating ZW10 functions within a multicomponent pathway. ZW10 accumulates at kinetochores in mitotically arrested cells, and its activity becomes essential at anaphase onset.","method":"Genetic epistasis analysis, immunofluorescence in Drosophila mutant backgrounds","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in multiple mutant backgrounds, replicated findings","pmids":["7914521"],"is_preprint":false},{"year":1996,"finding":"ZW10 redistribution from kinetochores to kinetochore microtubules at metaphase requires bipolar spindle attachment. The presence or absence of ZW10 at a kinetochore predicts whether that chromosome moves to the pole, placing ZW10 downstream of or within a tension-sensing mechanism regulating chromosome separation at anaphase onset.","method":"Immunofluorescence in Drosophila meiotic cells; analysis of chromosome behavior in multiple mutant backgrounds","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional correlation of protein localization with chromosome movement, multiple genetic backgrounds, replicated","pmids":["8794856"],"is_preprint":false},{"year":1997,"finding":"ZW10 protein is conserved from Drosophila to humans, mice, C. elegans, and plants. Human ZW10 displays the same cell cycle-dependent kinetochore localization as Drosophila ZW10 in HeLa cells. C. elegans ZW10 antisense RNA phenocopies Drosophila zw10 mutations, demonstrating functional conservation of the chromosome segregation role.","method":"Cross-species sequence analysis, anti-human ZW10 immunofluorescence in HeLa cells, C. elegans antisense RNA injection","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches across species, functional conservation demonstrated by antisense rescue phenotype","pmids":["9298984"],"is_preprint":false},{"year":1998,"finding":"ZW10 is required for dynein and dynactin localization to kinetochores in Drosophila. Dynamitin (p50 subunit of dynactin) interacts with ZW10 in a yeast two-hybrid screen. ZW10 and dynein show parallel behavior: both leave kinetochores at metaphase, both bind functional neocentromeres, and both require Rough Deal for kinetochore localization. In zw10 mutants, dynein fails to localize to kinetochores but chromosome congression proceeds normally, suggesting kinetochore dynein is dispensable for microtubule capture but essential for chromosome motion at anaphase.","method":"Yeast two-hybrid (ZW10-dynamitin interaction), immunofluorescence in zw10 mutants, analysis of dynein/ZW10 co-behavior","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid plus parallel in vivo localization experiments; ZW10-dynactin interaction and functional consequence both demonstrated","pmids":["9700164"],"is_preprint":false},{"year":1998,"finding":"Kinetochore localization of Bub3 (spindle assembly checkpoint protein) does not require ZW10 or Rod, demonstrating that kinetochore assembly proceeds through at least two relatively independent pathways.","method":"Immunofluorescence in Drosophila zw10 and rod mutant neuroblasts","journal":"Chromosoma","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single study, genetic epistasis, negative result that is mechanistically informative","pmids":["9914369"],"is_preprint":false},{"year":2000,"finding":"ZW10 and Rod together are required for normal poleward chromosome motion rate; zw10-null mutants show greatly attenuated poleward chromosome movement throughout division and highly asynchronous chromosome disjunction at anaphase.","method":"Live imaging of chromosome movement in zw10-null Drosophila cells","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — quantitative live imaging in null mutants, replicated across chromosomes","pmids":["11146661"],"is_preprint":false},{"year":2001,"finding":"ROD and ZW10 form a large (~700–900 kDa) evolutionarily conserved macromolecular complex in both Drosophila and human cells. They colocalize throughout mitosis, require each other for recruitment to the mitotic apparatus, and show no additive phenotypic effects in double null mutants, indicating they function in the same pathway.","method":"Co-immunoprecipitation from Drosophila and HeLa extracts, size-exclusion chromatography, immunofluorescence, zw10; rod double null mutant analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus genetic epistasis plus size determination, replicated in two species","pmids":["11590237"],"is_preprint":false},{"year":2003,"finding":"ZW10 and ROD form a trimeric complex with a third subunit, Zwilch. Zwilch localizes to kinetochores identically to ZW10 and ROD. Human Zwilch co-immunoprecipitates with hZW10 and hROD from HeLa extracts. Immunoaffinity chromatography data suggests a weak interaction between the ZW10/ROD/Zwilch (RZZ) complex and the kinesin CENP-meta.","method":"Immunoaffinity chromatography, mass spectrometry, co-immunoprecipitation from HeLa extracts, immunofluorescence, Drosophila mutant analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical purification with MS identification plus co-IP validation in human cells, genetic phenotype confirmation","pmids":["12686595"],"is_preprint":false},{"year":2004,"finding":"During interphase, ZW10 localizes to the endoplasmic reticulum and cytosol, and forms a subcomplex with RINT-1 and p31 within a larger complex containing syntaxin 18 (an ER-localized t-SNARE). ZW10/RINT-1/p31 dissociate from syntaxin 18 upon Mg2+-ATP treatment with NSF and alpha-SNAP (but the subcomplex itself is maintained). ZW10 overexpression, microinjection of antibodies, and ZW10 knockdown each disrupt membrane trafficking between the ER and Golgi.","method":"Co-immunoprecipitation, cell fractionation, overexpression, antibody microinjection, siRNA knockdown, Golgi morphology assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (co-IP, microinjection, RNAi) converging on ER-Golgi trafficking function","pmids":["15029241"],"is_preprint":false},{"year":2005,"finding":"In mitotic human cells, ZW10 resides in a complex with ROD and Zwilch (RZZ complex), while its other partner Zwint-1 is part of a separate structural kinetochore complex with Mis12 and Ndc80/Hec1. Zwint-1 is critical for recruiting ZW10 to unattached kinetochores. Depletion of ZW10 from human cells or Xenopus egg extracts abolishes stable Mad1-Mad2 binding to unattached kinetochores, demonstrating that the RZZ complex bridges structural kinetochore components to the mitotic checkpoint machinery.","method":"Co-immunoprecipitation from HeLa mitotic extracts, siRNA depletion in human cells, immunodepletion from Xenopus egg extracts, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus functional depletion in two systems (human cells and Xenopus extracts), mechanistic linkage established","pmids":["15824131"],"is_preprint":false},{"year":2006,"finding":"Hec1 directly interacts with Zwint-1 in human cells; Hec1 recruits Zwint-1 to kinetochores first (from prophase), after which Zwint-1 recruits ZW10 (from prometaphase). Depletion of Zwint-1 abolishes ZW10 kinetochore localization without affecting Hec1. This establishes a Hec1→Zwint-1→ZW10 sequential recruitment hierarchy at human kinetochores required for spindle checkpoint control.","method":"Co-immunoprecipitation (M-phase specific), siRNA depletion of Hec1 and Zwint-1, immunofluorescence","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — sequential depletion epistasis with co-IP, clear pathway hierarchy established with multiple orthogonal approaches","pmids":["16732327"],"is_preprint":false},{"year":2006,"finding":"ZW10 localizes to pericentriolar membranous structures and cosediments with Golgi membranes during interphase. Dominant-negative ZW10, anti-ZW10 antibody injection, and ZW10 RNAi each cause Golgi dispersal, endosome and lysosome dispersal, and a specific decrease in minus-end-directed movements as shown by live imaging. Golgi membrane-associated dynein is markedly decreased after ZW10 RNAi, indicating ZW10 mediates dynein cargo binding to membranes during interphase.","method":"Subcellular fractionation (cosedimentation), dominant-negative overexpression, antibody injection, RNAi, live imaging of organelle markers, dynein pulldown from membrane fractions","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal loss-of-function approaches with live imaging and biochemical dynein-membrane association assay","pmids":["16505164"],"is_preprint":false},{"year":2006,"finding":"RINT-1 regulates ZW10 localization and its entry into the syntaxin 18 SNARE complex. Overexpression of the N-terminal RINT-1 domain (which binds ZW10) causes ZW10 redistribution, ER-to-Golgi transport block, and Golgi dispersal. RINT-1 knockdown reduces ZW10 association with syntaxin 18. In contrast, ZW10 knockdown does not cause RINT-1 redistribution, establishing RINT-1 as upstream of ZW10 in the ER-Golgi trafficking pathway.","method":"Overexpression, siRNA knockdown, co-immunoprecipitation, Golgi morphology assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — directional epistasis established by asymmetric knockdown effects, multiple orthogonal methods in single lab","pmids":["16571679"],"is_preprint":false},{"year":2008,"finding":"In C. elegans, the RZZ complex and the coiled-coil adaptor SPDL-1 both recruit dynein/dynactin to kinetochores and are required for Mad2 targeting and spindle checkpoint activation. RZZ inhibition slows but does not prevent load-bearing kinetochore-microtubule attachments; SPDL-1 inhibition alone (which abolishes dynein targeting without perturbing RZZ localization) prevents load-bearing attachments. Co-inhibition of SPDL-1 and RZZ reduces severity to RZZ-alone levels, indicating RZZ can inhibit load-bearing attachment formation and that dynein (via SPDL-1) normally counteracts this RZZ activity.","method":"RNAi epistasis in C. elegans embryos, kinetochore tension assays, immunofluorescence, co-immunoprecipitation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with quantitative attachment assays; multiple perturbation conditions dissect RZZ and dynein functions","pmids":["18765790"],"is_preprint":false},{"year":2008,"finding":"The N-terminal region of ZW10 (not C-terminal as previously reported) is the major binding site for dynamitin. This N-terminal region can move along microtubules to the centrosomal area in a dynein-dynactin-dependent manner. Competitive binding experiments show dynamitin and RINT-1 bind the same N-terminal region of ZW10 in a mutually exclusive fashion; RINT-1 overexpression interferes with dynein-dynactin-mediated ZW10 movement. The N-terminal region also interacts with Zwint-1, suggesting partner-switching at this domain controls ZW10 localization and dynein-linking function.","method":"Yeast two-hybrid, co-immunoprecipitation with truncation mutants, competitive binding assays, live imaging of ZW10 movement","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with pulldown, competitive binding, and live imaging; single lab","pmids":["18782227"],"is_preprint":false},{"year":2010,"finding":"The Rod/Zw10 complex interacts with the N-terminal domain (first 47 residues) of PIASy (a SUMO E3 ligase) at centromeres. This interaction is required for centromeric localization of PIASy and for PIASy-dependent centromeric SUMOylation (SUMO2/3) during mitosis in Xenopus egg extracts. Depletion of Rod compromises centromeric localization of PIASy and SUMO2/3.","method":"Co-immunoprecipitation, truncation mapping, immunofluorescence in Xenopus egg extracts, immunodepletion of Rod","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP domain mapping plus functional depletion in Xenopus; single lab with two orthogonal approaches","pmids":["20696768"],"is_preprint":false},{"year":2015,"finding":"The human Rod-Zwilch-ZW10 (RZZ) complex was recombinantly reconstituted by co-expression in insect cells, purified to homogeneity, and shown to contain two copies of each subunit (~800 kDa predicted). Crystals were obtained in space group P3₁/P3₂, enabling structural studies.","method":"Recombinant co-expression in insect cells, biochemical purification, X-ray crystallography (initial crystals)","journal":"Acta crystallographica Section F","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — reconstitution of trimeric complex established, crystallization reported but structure not yet solved in this paper","pmids":["25849506"],"is_preprint":false},{"year":2019,"finding":"In Drosophila, CAL1 (CENP-A chaperone) interacts with Zw10 (RZZ complex component) and constitutes the anchor for RZZ complex recruitment to centromeres. This interaction connects CENP-A loading during metaphase to spindle assembly checkpoint signaling through RZZ.","method":"Co-immunoprecipitation, immunofluorescence, CAL1 overexpression experiments in Drosophila cultured cells","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional overexpression, single lab, two orthogonal approaches","pmids":["31553715"],"is_preprint":false},{"year":2019,"finding":"Zw10 localizes to kinetochores during mouse oocyte meiosis and is required for Mad2 recruitment to unattached kinetochores and spindle assembly checkpoint activation. Zw10 knockdown causes precocious polar body extrusion, impaired chromosome alignment, and increased aneuploidy.","method":"siRNA knockdown in mouse oocytes, immunofluorescence, quantification of Mad2 kinetochore signals, chromosome segregation analysis","journal":"Histochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with specific phenotypic readouts and Mad2 localization analysis; single lab","pmids":["31250100"],"is_preprint":false},{"year":2024,"finding":"PLK1 phosphorylates ZW10 at Ser12, and this phosphorylation is required for dynamic ZW10-Zwint1 interactions. Inhibition of ZW10 phosphorylation causes misaligned chromosomes, while persistent phospho-mimicking ZW10 causes premature anaphase with entangled sister chromatids, demonstrating that PLK1-mediated ZW10 phosphorylation fine-tunes spindle checkpoint silencing and accurate chromosome segregation.","method":"In vitro kinase assay (PLK1-ZW10), phospho-mutant and phospho-mimicking ZW10 expression, co-immunoprecipitation, chromosome segregation phenotype analysis","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus functional mutant analysis; single lab with two orthogonal approaches","pmids":["38402459"],"is_preprint":false}],"current_model":"ZW10 is a kinetochore scaffold protein that forms a conserved trimeric RZZ complex with ROD and Zwilch; it is recruited to kinetochores via a Hec1→Zwint-1→ZW10 hierarchy, where it recruits cytoplasmic dynein/dynactin (by binding dynamitin at its N-terminal domain) and enables Mad1–Mad2 binding to unattached kinetochores, thereby activating the spindle assembly checkpoint, while PLK1-mediated phosphorylation of ZW10 at Ser12 dynamically regulates Zwint-1 interaction to silence the checkpoint; during interphase ZW10 associates with the ER-localized syntaxin 18 SNARE complex through RINT-1 to mediate retrograde ER–Golgi membrane trafficking and recruits dynein to Golgi and endosomal membranes for minus-end-directed organelle movement."},"narrative":{"mechanistic_narrative":"ZW10 is a dual-function protein that operates at the kinetochore during mitosis and at the endomembrane system during interphase, in both contexts coupling cargo to the dynein/dynactin motor [PMID:1339459, PMID:9700164, PMID:16505164]. In dividing cells ZW10 shows cell cycle-dependent kinetochore localization and is required for accurate chromosome segregation, with loss causing lagging chromosomes and attenuated poleward chromosome motion [PMID:1339459, PMID:11146661]. It assembles with ROD and Zwilch into the evolutionarily conserved RZZ complex—a large (~700–900 kDa) particle containing two copies of each subunit—whose members mutually depend on one another for recruitment to the mitotic apparatus [PMID:11590237, PMID:12686595, PMID:25849506]. RZZ is recruited to kinetochores through a sequential Hec1→Zwint-1→ZW10 hierarchy, and ZW10 in turn recruits the dynein/dynactin motor (binding the dynactin subunit dynamitin through its N-terminal domain) and enables stable Mad1–Mad2 loading at unattached kinetochores, thereby bridging structural kinetochore components to the spindle assembly checkpoint [PMID:9700164, PMID:15824131, PMID:16732327, PMID:18782227]. The same N-terminal region binds dynamitin, RINT-1, and Zwint-1 in a mutually exclusive manner, so that partner switching at this domain governs ZW10 localization and dynein linkage [PMID:18782227]. PLK1 phosphorylates ZW10 at Ser12 to dynamically tune the ZW10–Zwint-1 interaction and fine-tune checkpoint silencing and segregation fidelity [PMID:38402459]. During interphase ZW10 relocalizes to the ER, cytosol, and Golgi/endosomal membranes, where it joins a RINT-1/p31 subcomplex associated with the syntaxin 18 ER t-SNARE to mediate retrograde ER–Golgi membrane trafficking and recruits dynein to membranes for minus-end-directed organelle movement [PMID:15029241, PMID:16505164, PMID:16571679].","teleology":[{"year":1992,"claim":"Established ZW10 as a cell cycle-regulated factor whose proper behavior is needed for faithful chromosome segregation, framing it as an anaphase-onset effector rather than a static structural protein.","evidence":"Immunofluorescence tracking of dynamic localization and mutant phenotype analysis in Drosophila neuroblasts","pmids":["1339459"],"confidence":"High","gaps":["Molecular partners and biochemical activity unknown","The filamentous structure ZW10 associates with at metaphase not molecularly defined"]},{"year":1994,"claim":"Placed ZW10 within a multicomponent kinetochore pathway by showing its kinetochore localization depends on rough deal and abnormal anaphase resolution gene products, indicating ZW10 acts as part of a complex rather than alone.","evidence":"Genetic epistasis and immunofluorescence in Drosophila mutant backgrounds","pmids":["7914521"],"confidence":"High","gaps":["Physical nature of the interactions not yet shown","Downstream effectors of the pathway unidentified"]},{"year":1996,"claim":"Linked ZW10 kinetochore residency to spindle attachment/tension, showing its localization predicts chromosome fate and positioning it within a tension-sensing mechanism for anaphase control.","evidence":"Immunofluorescence correlated with chromosome movement in Drosophila meiotic cells","pmids":["8794856"],"confidence":"High","gaps":["Mechanism translating attachment status into ZW10 redistribution unknown"]},{"year":1997,"claim":"Demonstrated evolutionary conservation of ZW10 structure and function from flies to humans and worms, validating model-organism findings for the human protein.","evidence":"Cross-species sequence analysis, anti-human ZW10 IF in HeLa, C. elegans antisense phenocopy","pmids":["9298984"],"confidence":"High","gaps":["Conserved binding partners not yet defined"]},{"year":1998,"claim":"Identified the molecular output of kinetochore ZW10 as dynein/dynactin recruitment via a direct dynamitin interaction, explaining its role in anaphase chromosome motion separate from microtubule capture.","evidence":"Yeast two-hybrid (ZW10–dynamitin) and IF in zw10 mutants in Drosophila","pmids":["9700164"],"confidence":"High","gaps":["Dynamitin-binding region of ZW10 initially mismapped (later revised)","How dynein recruitment relates to checkpoint not addressed"]},{"year":1998,"claim":"Distinguished ZW10/Rod from other checkpoint arms by showing Bub3 kinetochore loading is ZW10-independent, revealing parallel kinetochore assembly pathways.","evidence":"Immunofluorescence in Drosophila zw10 and rod mutant neuroblasts","pmids":["9914369"],"confidence":"Medium","gaps":["Single study with a negative result","Relationship to Mad1/Mad2 arm not tested here"]},{"year":2000,"claim":"Quantified the functional consequence of ZW10/Rod loss as slowed, asynchronous poleward chromosome motion, tying the complex to the kinetics of segregation.","evidence":"Live imaging of chromosome movement in zw10-null Drosophila cells","pmids":["11146661"],"confidence":"High","gaps":["Direct molecular cause of motion defect (dynein vs other) not isolated in this assay"]},{"year":2001,"claim":"Defined ROD and ZW10 as a single large conserved macromolecular complex that functions in one pathway, consolidating prior genetic interactions into biochemistry.","evidence":"Reciprocal co-IP, size-exclusion chromatography and double-null epistasis in Drosophila and HeLa","pmids":["11590237"],"confidence":"High","gaps":["Complete subunit composition not yet known","Stoichiometry undefined"]},{"year":2003,"claim":"Completed the core complex by identifying Zwilch as the third subunit, defining the trimeric RZZ complex and a candidate kinesin (CENP-meta) interaction.","evidence":"Immunoaffinity chromatography/MS and co-IP from HeLa, Drosophila mutant analysis","pmids":["12686595"],"confidence":"High","gaps":["CENP-meta interaction weak and unvalidated functionally","Subunit stoichiometry not resolved"]},{"year":2004,"claim":"Revealed a distinct interphase function, placing ZW10 in a RINT-1/p31/syntaxin 18 SNARE assembly that mediates ER–Golgi membrane trafficking.","evidence":"Co-IP, fractionation, overexpression, antibody microinjection, siRNA and Golgi morphology assays","pmids":["15029241"],"confidence":"High","gaps":["How ZW10 partitions between mitotic and interphase complexes unknown","Direct binding within the SNARE assembly not mapped"]},{"year":2005,"claim":"Established RZZ as the bridge between structural kinetochore components and the checkpoint, showing ZW10 is recruited via Zwint-1 and is required for stable Mad1–Mad2 binding at unattached kinetochores.","evidence":"Co-IP from HeLa mitotic extracts, siRNA depletion and Xenopus egg extract immunodepletion","pmids":["15824131"],"confidence":"High","gaps":["Mechanism by which RZZ promotes Mad1–Mad2 loading not molecularly defined"]},{"year":2006,"claim":"Defined the kinetochore recruitment hierarchy Hec1→Zwint-1→ZW10, providing the ordered assembly logic for RZZ-dependent checkpoint control in human cells.","evidence":"M-phase co-IP and sequential siRNA depletion of Hec1 and Zwint-1 in human cells","pmids":["16732327"],"confidence":"High","gaps":["Structural basis of the Zwint-1–ZW10 contact not resolved"]},{"year":2006,"claim":"Extended the interphase role to organelle positioning, showing ZW10 loads dynein onto Golgi/endosome/lysosome membranes to drive minus-end-directed organelle movement.","evidence":"Cosedimentation, dominant-negative, antibody injection, RNAi, live imaging and dynein membrane pulldown","pmids":["16505164"],"confidence":"High","gaps":["Whether membrane dynein recruitment uses the same dynamitin contact as at kinetochores not directly shown here"]},{"year":2006,"claim":"Ordered the interphase pathway by placing RINT-1 upstream of ZW10 in controlling ZW10 entry into the syntaxin 18 SNARE complex and ER–Golgi transport.","evidence":"Asymmetric knockdown epistasis, co-IP and Golgi morphology assays","pmids":["16571679"],"confidence":"High","gaps":["Single-lab directional epistasis","Trigger that recruits ZW10 to RINT-1 unknown"]},{"year":2008,"claim":"Remapped the dynamitin-binding site to the ZW10 N-terminus and revealed mutually exclusive binding of dynamitin, RINT-1 and Zwint-1, establishing partner switching at one domain as the switch between functions.","evidence":"Yeast two-hybrid, truncation co-IP, competitive binding and live imaging of ZW10 movement","pmids":["18782227"],"confidence":"Medium","gaps":["Single lab","Structural basis of competitive binding not solved","Regulation of partner choice in cells not defined"]},{"year":2008,"claim":"Dissected RZZ versus dynein contributions at kinetochores, showing RZZ inhibits load-bearing attachments while dynein (recruited via SPDL-1) counteracts this, refining how the complex regulates attachment maturation.","evidence":"RNAi epistasis with kinetochore tension assays and co-IP in C. elegans embryos","pmids":["18765790"],"confidence":"High","gaps":["Molecular mechanism of RZZ attachment inhibition unknown","Relationship of SPDL-1 to human Spindly-equivalent in this dataset not established"]},{"year":2010,"claim":"Connected the Rod/Zw10 complex to centromeric SUMOylation by showing it recruits the SUMO E3 ligase PIASy and supports SUMO2/3 modification at centromeres during mitosis.","evidence":"Co-IP, truncation mapping and Rod immunodepletion in Xenopus egg extracts","pmids":["20696768"],"confidence":"Medium","gaps":["Single lab","Functional consequence of centromeric SUMOylation downstream of RZZ not defined"]},{"year":2015,"claim":"Provided a defined biochemical reagent by reconstituting recombinant human RZZ with two copies of each subunit and obtaining crystals, enabling structural analysis.","evidence":"Recombinant insect-cell co-expression, purification and X-ray crystallization","pmids":["25849506"],"confidence":"Medium","gaps":["Atomic structure not solved in this work","Conformational basis of partner switching not addressed"]},{"year":2019,"claim":"Identified CAL1, the CENP-A chaperone, as a centromeric anchor for RZZ in Drosophila, linking CENP-A loading to checkpoint signaling through ZW10.","evidence":"Co-IP, IF and CAL1 overexpression in Drosophila cultured cells","pmids":["31553715"],"confidence":"Medium","gaps":["Single lab","Whether a human equivalent anchor exists not addressed"]},{"year":2019,"claim":"Demonstrated that ZW10's checkpoint function operates in mammalian meiosis, with Zw10 needed for Mad2 recruitment and euploid oocyte maturation.","evidence":"siRNA knockdown in mouse oocytes with Mad2 quantification and segregation analysis","pmids":["31250100"],"confidence":"Medium","gaps":["Single lab","Whether RZZ assembly/recruitment in oocytes mirrors mitotic hierarchy not shown"]},{"year":2024,"claim":"Introduced a post-translational control layer, showing PLK1 phosphorylation of ZW10 at Ser12 dynamically tunes the ZW10–Zwint-1 interaction to balance checkpoint silencing against segregation errors.","evidence":"In vitro PLK1 kinase assay, phospho-mutant/phospho-mimic expression, co-IP and segregation phenotyping","pmids":["38402459"],"confidence":"Medium","gaps":["Single lab","Structural effect of Ser12 phosphorylation on the Zwint-1 interface not resolved","Other ZW10 phosphosites/kinases not explored"]},{"year":null,"claim":"How a single ZW10 N-terminal hub coordinates partner switching among dynamitin, RINT-1, and Zwint-1 to toggle between mitotic checkpoint/segregation and interphase membrane-trafficking functions, and the atomic structure underlying RZZ assembly and these contacts, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No atomic structure of full RZZ or of ZW10–partner interfaces","Cell-cycle signal that reassigns ZW10 between complexes unknown","Quantitative partitioning of ZW10 pools across functions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,10,12,15]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[4,12]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,1,2,8,11]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[9,13]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[12,13]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,6,10,11]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[9,12,13]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[12]}],"complexes":["RZZ complex (ROD-Zwilch-ZW10)","syntaxin 18 SNARE complex (ZW10/RINT-1/p31)"],"partners":["ROD","ZWILCH","ZWINT-1","DYNAMITIN","RINT-1","SYNTAXIN 18","PLK1","CAL1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43264","full_name":"Centromere/kinetochore protein zw10 homolog","aliases":[],"length_aa":779,"mass_kda":88.8,"function":"Essential component of the mitotic checkpoint, which prevents cells from prematurely exiting mitosis. Required for the assembly of the dynein-dynactin and MAD1-MAD2 complexes onto kinetochores. Its function related to the spindle assembly machinery is proposed to depend on its association in the mitotic RZZ complex (PubMed:11590237, PubMed:15485811, PubMed:15824131). Involved in regulation of membrane traffic between the Golgi and the endoplasmic reticulum (ER); the function is proposed to depend on its association in the interphase NRZ complex which is believed to play a role in SNARE assembly at the ER (PubMed:15029241)","subcellular_location":"Cytoplasm; Endoplasmic reticulum membrane; Chromosome, centromere, kinetochore; Cytoplasm, cytoskeleton, spindle; Lipid droplet","url":"https://www.uniprot.org/uniprotkb/O43264/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZW10","classification":"Not Classified","n_dependent_lines":394,"n_total_lines":1208,"dependency_fraction":0.326158940397351},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"BNIP1","stoichiometry":10.0},{"gene":"STX18","stoichiometry":10.0},{"gene":"GOSR1","stoichiometry":4.0},{"gene":"SCFD1","stoichiometry":4.0},{"gene":"ACTB","stoichiometry":0.2},{"gene":"COPA","stoichiometry":0.2},{"gene":"COPB2","stoichiometry":0.2},{"gene":"COPE","stoichiometry":0.2},{"gene":"GOLT1B","stoichiometry":0.2},{"gene":"PGRMC1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ZW10","total_profiled":1310},"omim":[{"mim_id":"616401","title":"SPINDLE APPARATUS COILED-COIL PROTEIN 1; SPDL1","url":"https://www.omim.org/entry/616401"},{"mim_id":"615890","title":"DYNEIN, CYTOPLASMIC 1, LIGHT INTERMEDIATE CHAIN 1; DYNC1LI1","url":"https://www.omim.org/entry/615890"},{"mim_id":"610089","title":"RAD50-INTERACTING PROTEIN 1; 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Loss-of-function causes lagging chromosomes and broken centromeric connections in colchicine-treated cells.\",\n      \"method\": \"Immunofluorescence microscopy, mutant analysis in Drosophila larval brain neuroblasts\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with functional phenotype, replicated across multiple cell types and tissues\",\n      \"pmids\": [\"1339459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"ZW10 protein localization at kinetochores is dependent on the rough deal and abnormal anaphase resolution gene products, indicating ZW10 functions within a multicomponent pathway. ZW10 accumulates at kinetochores in mitotically arrested cells, and its activity becomes essential at anaphase onset.\",\n      \"method\": \"Genetic epistasis analysis, immunofluorescence in Drosophila mutant backgrounds\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in multiple mutant backgrounds, replicated findings\",\n      \"pmids\": [\"7914521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ZW10 redistribution from kinetochores to kinetochore microtubules at metaphase requires bipolar spindle attachment. The presence or absence of ZW10 at a kinetochore predicts whether that chromosome moves to the pole, placing ZW10 downstream of or within a tension-sensing mechanism regulating chromosome separation at anaphase onset.\",\n      \"method\": \"Immunofluorescence in Drosophila meiotic cells; analysis of chromosome behavior in multiple mutant backgrounds\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional correlation of protein localization with chromosome movement, multiple genetic backgrounds, replicated\",\n      \"pmids\": [\"8794856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ZW10 protein is conserved from Drosophila to humans, mice, C. elegans, and plants. Human ZW10 displays the same cell cycle-dependent kinetochore localization as Drosophila ZW10 in HeLa cells. C. elegans ZW10 antisense RNA phenocopies Drosophila zw10 mutations, demonstrating functional conservation of the chromosome segregation role.\",\n      \"method\": \"Cross-species sequence analysis, anti-human ZW10 immunofluorescence in HeLa cells, C. elegans antisense RNA injection\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches across species, functional conservation demonstrated by antisense rescue phenotype\",\n      \"pmids\": [\"9298984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ZW10 is required for dynein and dynactin localization to kinetochores in Drosophila. Dynamitin (p50 subunit of dynactin) interacts with ZW10 in a yeast two-hybrid screen. ZW10 and dynein show parallel behavior: both leave kinetochores at metaphase, both bind functional neocentromeres, and both require Rough Deal for kinetochore localization. In zw10 mutants, dynein fails to localize to kinetochores but chromosome congression proceeds normally, suggesting kinetochore dynein is dispensable for microtubule capture but essential for chromosome motion at anaphase.\",\n      \"method\": \"Yeast two-hybrid (ZW10-dynamitin interaction), immunofluorescence in zw10 mutants, analysis of dynein/ZW10 co-behavior\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid plus parallel in vivo localization experiments; ZW10-dynactin interaction and functional consequence both demonstrated\",\n      \"pmids\": [\"9700164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Kinetochore localization of Bub3 (spindle assembly checkpoint protein) does not require ZW10 or Rod, demonstrating that kinetochore assembly proceeds through at least two relatively independent pathways.\",\n      \"method\": \"Immunofluorescence in Drosophila zw10 and rod mutant neuroblasts\",\n      \"journal\": \"Chromosoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single study, genetic epistasis, negative result that is mechanistically informative\",\n      \"pmids\": [\"9914369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ZW10 and Rod together are required for normal poleward chromosome motion rate; zw10-null mutants show greatly attenuated poleward chromosome movement throughout division and highly asynchronous chromosome disjunction at anaphase.\",\n      \"method\": \"Live imaging of chromosome movement in zw10-null Drosophila cells\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — quantitative live imaging in null mutants, replicated across chromosomes\",\n      \"pmids\": [\"11146661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ROD and ZW10 form a large (~700–900 kDa) evolutionarily conserved macromolecular complex in both Drosophila and human cells. They colocalize throughout mitosis, require each other for recruitment to the mitotic apparatus, and show no additive phenotypic effects in double null mutants, indicating they function in the same pathway.\",\n      \"method\": \"Co-immunoprecipitation from Drosophila and HeLa extracts, size-exclusion chromatography, immunofluorescence, zw10; rod double null mutant analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus genetic epistasis plus size determination, replicated in two species\",\n      \"pmids\": [\"11590237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ZW10 and ROD form a trimeric complex with a third subunit, Zwilch. Zwilch localizes to kinetochores identically to ZW10 and ROD. Human Zwilch co-immunoprecipitates with hZW10 and hROD from HeLa extracts. Immunoaffinity chromatography data suggests a weak interaction between the ZW10/ROD/Zwilch (RZZ) complex and the kinesin CENP-meta.\",\n      \"method\": \"Immunoaffinity chromatography, mass spectrometry, co-immunoprecipitation from HeLa extracts, immunofluorescence, Drosophila mutant analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical purification with MS identification plus co-IP validation in human cells, genetic phenotype confirmation\",\n      \"pmids\": [\"12686595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"During interphase, ZW10 localizes to the endoplasmic reticulum and cytosol, and forms a subcomplex with RINT-1 and p31 within a larger complex containing syntaxin 18 (an ER-localized t-SNARE). ZW10/RINT-1/p31 dissociate from syntaxin 18 upon Mg2+-ATP treatment with NSF and alpha-SNAP (but the subcomplex itself is maintained). ZW10 overexpression, microinjection of antibodies, and ZW10 knockdown each disrupt membrane trafficking between the ER and Golgi.\",\n      \"method\": \"Co-immunoprecipitation, cell fractionation, overexpression, antibody microinjection, siRNA knockdown, Golgi morphology assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (co-IP, microinjection, RNAi) converging on ER-Golgi trafficking function\",\n      \"pmids\": [\"15029241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In mitotic human cells, ZW10 resides in a complex with ROD and Zwilch (RZZ complex), while its other partner Zwint-1 is part of a separate structural kinetochore complex with Mis12 and Ndc80/Hec1. Zwint-1 is critical for recruiting ZW10 to unattached kinetochores. Depletion of ZW10 from human cells or Xenopus egg extracts abolishes stable Mad1-Mad2 binding to unattached kinetochores, demonstrating that the RZZ complex bridges structural kinetochore components to the mitotic checkpoint machinery.\",\n      \"method\": \"Co-immunoprecipitation from HeLa mitotic extracts, siRNA depletion in human cells, immunodepletion from Xenopus egg extracts, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus functional depletion in two systems (human cells and Xenopus extracts), mechanistic linkage established\",\n      \"pmids\": [\"15824131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Hec1 directly interacts with Zwint-1 in human cells; Hec1 recruits Zwint-1 to kinetochores first (from prophase), after which Zwint-1 recruits ZW10 (from prometaphase). Depletion of Zwint-1 abolishes ZW10 kinetochore localization without affecting Hec1. This establishes a Hec1→Zwint-1→ZW10 sequential recruitment hierarchy at human kinetochores required for spindle checkpoint control.\",\n      \"method\": \"Co-immunoprecipitation (M-phase specific), siRNA depletion of Hec1 and Zwint-1, immunofluorescence\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — sequential depletion epistasis with co-IP, clear pathway hierarchy established with multiple orthogonal approaches\",\n      \"pmids\": [\"16732327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ZW10 localizes to pericentriolar membranous structures and cosediments with Golgi membranes during interphase. Dominant-negative ZW10, anti-ZW10 antibody injection, and ZW10 RNAi each cause Golgi dispersal, endosome and lysosome dispersal, and a specific decrease in minus-end-directed movements as shown by live imaging. Golgi membrane-associated dynein is markedly decreased after ZW10 RNAi, indicating ZW10 mediates dynein cargo binding to membranes during interphase.\",\n      \"method\": \"Subcellular fractionation (cosedimentation), dominant-negative overexpression, antibody injection, RNAi, live imaging of organelle markers, dynein pulldown from membrane fractions\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal loss-of-function approaches with live imaging and biochemical dynein-membrane association assay\",\n      \"pmids\": [\"16505164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RINT-1 regulates ZW10 localization and its entry into the syntaxin 18 SNARE complex. Overexpression of the N-terminal RINT-1 domain (which binds ZW10) causes ZW10 redistribution, ER-to-Golgi transport block, and Golgi dispersal. RINT-1 knockdown reduces ZW10 association with syntaxin 18. In contrast, ZW10 knockdown does not cause RINT-1 redistribution, establishing RINT-1 as upstream of ZW10 in the ER-Golgi trafficking pathway.\",\n      \"method\": \"Overexpression, siRNA knockdown, co-immunoprecipitation, Golgi morphology assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — directional epistasis established by asymmetric knockdown effects, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"16571679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In C. elegans, the RZZ complex and the coiled-coil adaptor SPDL-1 both recruit dynein/dynactin to kinetochores and are required for Mad2 targeting and spindle checkpoint activation. RZZ inhibition slows but does not prevent load-bearing kinetochore-microtubule attachments; SPDL-1 inhibition alone (which abolishes dynein targeting without perturbing RZZ localization) prevents load-bearing attachments. Co-inhibition of SPDL-1 and RZZ reduces severity to RZZ-alone levels, indicating RZZ can inhibit load-bearing attachment formation and that dynein (via SPDL-1) normally counteracts this RZZ activity.\",\n      \"method\": \"RNAi epistasis in C. elegans embryos, kinetochore tension assays, immunofluorescence, co-immunoprecipitation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with quantitative attachment assays; multiple perturbation conditions dissect RZZ and dynein functions\",\n      \"pmids\": [\"18765790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The N-terminal region of ZW10 (not C-terminal as previously reported) is the major binding site for dynamitin. This N-terminal region can move along microtubules to the centrosomal area in a dynein-dynactin-dependent manner. Competitive binding experiments show dynamitin and RINT-1 bind the same N-terminal region of ZW10 in a mutually exclusive fashion; RINT-1 overexpression interferes with dynein-dynactin-mediated ZW10 movement. The N-terminal region also interacts with Zwint-1, suggesting partner-switching at this domain controls ZW10 localization and dynein-linking function.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation with truncation mutants, competitive binding assays, live imaging of ZW10 movement\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with pulldown, competitive binding, and live imaging; single lab\",\n      \"pmids\": [\"18782227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The Rod/Zw10 complex interacts with the N-terminal domain (first 47 residues) of PIASy (a SUMO E3 ligase) at centromeres. This interaction is required for centromeric localization of PIASy and for PIASy-dependent centromeric SUMOylation (SUMO2/3) during mitosis in Xenopus egg extracts. Depletion of Rod compromises centromeric localization of PIASy and SUMO2/3.\",\n      \"method\": \"Co-immunoprecipitation, truncation mapping, immunofluorescence in Xenopus egg extracts, immunodepletion of Rod\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP domain mapping plus functional depletion in Xenopus; single lab with two orthogonal approaches\",\n      \"pmids\": [\"20696768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The human Rod-Zwilch-ZW10 (RZZ) complex was recombinantly reconstituted by co-expression in insect cells, purified to homogeneity, and shown to contain two copies of each subunit (~800 kDa predicted). Crystals were obtained in space group P3₁/P3₂, enabling structural studies.\",\n      \"method\": \"Recombinant co-expression in insect cells, biochemical purification, X-ray crystallography (initial crystals)\",\n      \"journal\": \"Acta crystallographica Section F\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — reconstitution of trimeric complex established, crystallization reported but structure not yet solved in this paper\",\n      \"pmids\": [\"25849506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In Drosophila, CAL1 (CENP-A chaperone) interacts with Zw10 (RZZ complex component) and constitutes the anchor for RZZ complex recruitment to centromeres. This interaction connects CENP-A loading during metaphase to spindle assembly checkpoint signaling through RZZ.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, CAL1 overexpression experiments in Drosophila cultured cells\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional overexpression, single lab, two orthogonal approaches\",\n      \"pmids\": [\"31553715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Zw10 localizes to kinetochores during mouse oocyte meiosis and is required for Mad2 recruitment to unattached kinetochores and spindle assembly checkpoint activation. Zw10 knockdown causes precocious polar body extrusion, impaired chromosome alignment, and increased aneuploidy.\",\n      \"method\": \"siRNA knockdown in mouse oocytes, immunofluorescence, quantification of Mad2 kinetochore signals, chromosome segregation analysis\",\n      \"journal\": \"Histochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with specific phenotypic readouts and Mad2 localization analysis; single lab\",\n      \"pmids\": [\"31250100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PLK1 phosphorylates ZW10 at Ser12, and this phosphorylation is required for dynamic ZW10-Zwint1 interactions. Inhibition of ZW10 phosphorylation causes misaligned chromosomes, while persistent phospho-mimicking ZW10 causes premature anaphase with entangled sister chromatids, demonstrating that PLK1-mediated ZW10 phosphorylation fine-tunes spindle checkpoint silencing and accurate chromosome segregation.\",\n      \"method\": \"In vitro kinase assay (PLK1-ZW10), phospho-mutant and phospho-mimicking ZW10 expression, co-immunoprecipitation, chromosome segregation phenotype analysis\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus functional mutant analysis; single lab with two orthogonal approaches\",\n      \"pmids\": [\"38402459\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZW10 is a kinetochore scaffold protein that forms a conserved trimeric RZZ complex with ROD and Zwilch; it is recruited to kinetochores via a Hec1→Zwint-1→ZW10 hierarchy, where it recruits cytoplasmic dynein/dynactin (by binding dynamitin at its N-terminal domain) and enables Mad1–Mad2 binding to unattached kinetochores, thereby activating the spindle assembly checkpoint, while PLK1-mediated phosphorylation of ZW10 at Ser12 dynamically regulates Zwint-1 interaction to silence the checkpoint; during interphase ZW10 associates with the ER-localized syntaxin 18 SNARE complex through RINT-1 to mediate retrograde ER–Golgi membrane trafficking and recruits dynein to Golgi and endosomal membranes for minus-end-directed organelle movement.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZW10 is a dual-function protein that operates at the kinetochore during mitosis and at the endomembrane system during interphase, in both contexts coupling cargo to the dynein/dynactin motor [#0, #4, #12]. In dividing cells ZW10 shows cell cycle-dependent kinetochore localization and is required for accurate chromosome segregation, with loss causing lagging chromosomes and attenuated poleward chromosome motion [#0, #6]. It assembles with ROD and Zwilch into the evolutionarily conserved RZZ complex—a large (~700–900 kDa) particle containing two copies of each subunit—whose members mutually depend on one another for recruitment to the mitotic apparatus [#7, #8, #17]. RZZ is recruited to kinetochores through a sequential Hec1→Zwint-1→ZW10 hierarchy, and ZW10 in turn recruits the dynein/dynactin motor (binding the dynactin subunit dynamitin through its N-terminal domain) and enables stable Mad1–Mad2 loading at unattached kinetochores, thereby bridging structural kinetochore components to the spindle assembly checkpoint [#4, #10, #11, #15]. The same N-terminal region binds dynamitin, RINT-1, and Zwint-1 in a mutually exclusive manner, so that partner switching at this domain governs ZW10 localization and dynein linkage [#15]. PLK1 phosphorylates ZW10 at Ser12 to dynamically tune the ZW10–Zwint-1 interaction and fine-tune checkpoint silencing and segregation fidelity [#20]. During interphase ZW10 relocalizes to the ER, cytosol, and Golgi/endosomal membranes, where it joins a RINT-1/p31 subcomplex associated with the syntaxin 18 ER t-SNARE to mediate retrograde ER–Golgi membrane trafficking and recruits dynein to membranes for minus-end-directed organelle movement [#9, #12, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established ZW10 as a cell cycle-regulated factor whose proper behavior is needed for faithful chromosome segregation, framing it as an anaphase-onset effector rather than a static structural protein.\",\n      \"evidence\": \"Immunofluorescence tracking of dynamic localization and mutant phenotype analysis in Drosophila neuroblasts\",\n      \"pmids\": [\"1339459\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners and biochemical activity unknown\", \"The filamentous structure ZW10 associates with at metaphase not molecularly defined\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Placed ZW10 within a multicomponent kinetochore pathway by showing its kinetochore localization depends on rough deal and abnormal anaphase resolution gene products, indicating ZW10 acts as part of a complex rather than alone.\",\n      \"evidence\": \"Genetic epistasis and immunofluorescence in Drosophila mutant backgrounds\",\n      \"pmids\": [\"7914521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical nature of the interactions not yet shown\", \"Downstream effectors of the pathway unidentified\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Linked ZW10 kinetochore residency to spindle attachment/tension, showing its localization predicts chromosome fate and positioning it within a tension-sensing mechanism for anaphase control.\",\n      \"evidence\": \"Immunofluorescence correlated with chromosome movement in Drosophila meiotic cells\",\n      \"pmids\": [\"8794856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism translating attachment status into ZW10 redistribution unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrated evolutionary conservation of ZW10 structure and function from flies to humans and worms, validating model-organism findings for the human protein.\",\n      \"evidence\": \"Cross-species sequence analysis, anti-human ZW10 IF in HeLa, C. elegans antisense phenocopy\",\n      \"pmids\": [\"9298984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conserved binding partners not yet defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identified the molecular output of kinetochore ZW10 as dynein/dynactin recruitment via a direct dynamitin interaction, explaining its role in anaphase chromosome motion separate from microtubule capture.\",\n      \"evidence\": \"Yeast two-hybrid (ZW10–dynamitin) and IF in zw10 mutants in Drosophila\",\n      \"pmids\": [\"9700164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamitin-binding region of ZW10 initially mismapped (later revised)\", \"How dynein recruitment relates to checkpoint not addressed\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Distinguished ZW10/Rod from other checkpoint arms by showing Bub3 kinetochore loading is ZW10-independent, revealing parallel kinetochore assembly pathways.\",\n      \"evidence\": \"Immunofluorescence in Drosophila zw10 and rod mutant neuroblasts\",\n      \"pmids\": [\"9914369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study with a negative result\", \"Relationship to Mad1/Mad2 arm not tested here\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Quantified the functional consequence of ZW10/Rod loss as slowed, asynchronous poleward chromosome motion, tying the complex to the kinetics of segregation.\",\n      \"evidence\": \"Live imaging of chromosome movement in zw10-null Drosophila cells\",\n      \"pmids\": [\"11146661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular cause of motion defect (dynein vs other) not isolated in this assay\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined ROD and ZW10 as a single large conserved macromolecular complex that functions in one pathway, consolidating prior genetic interactions into biochemistry.\",\n      \"evidence\": \"Reciprocal co-IP, size-exclusion chromatography and double-null epistasis in Drosophila and HeLa\",\n      \"pmids\": [\"11590237\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Complete subunit composition not yet known\", \"Stoichiometry undefined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Completed the core complex by identifying Zwilch as the third subunit, defining the trimeric RZZ complex and a candidate kinesin (CENP-meta) interaction.\",\n      \"evidence\": \"Immunoaffinity chromatography/MS and co-IP from HeLa, Drosophila mutant analysis\",\n      \"pmids\": [\"12686595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CENP-meta interaction weak and unvalidated functionally\", \"Subunit stoichiometry not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed a distinct interphase function, placing ZW10 in a RINT-1/p31/syntaxin 18 SNARE assembly that mediates ER–Golgi membrane trafficking.\",\n      \"evidence\": \"Co-IP, fractionation, overexpression, antibody microinjection, siRNA and Golgi morphology assays\",\n      \"pmids\": [\"15029241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ZW10 partitions between mitotic and interphase complexes unknown\", \"Direct binding within the SNARE assembly not mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Established RZZ as the bridge between structural kinetochore components and the checkpoint, showing ZW10 is recruited via Zwint-1 and is required for stable Mad1–Mad2 binding at unattached kinetochores.\",\n      \"evidence\": \"Co-IP from HeLa mitotic extracts, siRNA depletion and Xenopus egg extract immunodepletion\",\n      \"pmids\": [\"15824131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which RZZ promotes Mad1–Mad2 loading not molecularly defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the kinetochore recruitment hierarchy Hec1→Zwint-1→ZW10, providing the ordered assembly logic for RZZ-dependent checkpoint control in human cells.\",\n      \"evidence\": \"M-phase co-IP and sequential siRNA depletion of Hec1 and Zwint-1 in human cells\",\n      \"pmids\": [\"16732327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Zwint-1–ZW10 contact not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended the interphase role to organelle positioning, showing ZW10 loads dynein onto Golgi/endosome/lysosome membranes to drive minus-end-directed organelle movement.\",\n      \"evidence\": \"Cosedimentation, dominant-negative, antibody injection, RNAi, live imaging and dynein membrane pulldown\",\n      \"pmids\": [\"16505164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether membrane dynein recruitment uses the same dynamitin contact as at kinetochores not directly shown here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Ordered the interphase pathway by placing RINT-1 upstream of ZW10 in controlling ZW10 entry into the syntaxin 18 SNARE complex and ER–Golgi transport.\",\n      \"evidence\": \"Asymmetric knockdown epistasis, co-IP and Golgi morphology assays\",\n      \"pmids\": [\"16571679\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab directional epistasis\", \"Trigger that recruits ZW10 to RINT-1 unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Remapped the dynamitin-binding site to the ZW10 N-terminus and revealed mutually exclusive binding of dynamitin, RINT-1 and Zwint-1, establishing partner switching at one domain as the switch between functions.\",\n      \"evidence\": \"Yeast two-hybrid, truncation co-IP, competitive binding and live imaging of ZW10 movement\",\n      \"pmids\": [\"18782227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Structural basis of competitive binding not solved\", \"Regulation of partner choice in cells not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Dissected RZZ versus dynein contributions at kinetochores, showing RZZ inhibits load-bearing attachments while dynein (recruited via SPDL-1) counteracts this, refining how the complex regulates attachment maturation.\",\n      \"evidence\": \"RNAi epistasis with kinetochore tension assays and co-IP in C. elegans embryos\",\n      \"pmids\": [\"18765790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of RZZ attachment inhibition unknown\", \"Relationship of SPDL-1 to human Spindly-equivalent in this dataset not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected the Rod/Zw10 complex to centromeric SUMOylation by showing it recruits the SUMO E3 ligase PIASy and supports SUMO2/3 modification at centromeres during mitosis.\",\n      \"evidence\": \"Co-IP, truncation mapping and Rod immunodepletion in Xenopus egg extracts\",\n      \"pmids\": [\"20696768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Functional consequence of centromeric SUMOylation downstream of RZZ not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided a defined biochemical reagent by reconstituting recombinant human RZZ with two copies of each subunit and obtaining crystals, enabling structural analysis.\",\n      \"evidence\": \"Recombinant insect-cell co-expression, purification and X-ray crystallization\",\n      \"pmids\": [\"25849506\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Atomic structure not solved in this work\", \"Conformational basis of partner switching not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified CAL1, the CENP-A chaperone, as a centromeric anchor for RZZ in Drosophila, linking CENP-A loading to checkpoint signaling through ZW10.\",\n      \"evidence\": \"Co-IP, IF and CAL1 overexpression in Drosophila cultured cells\",\n      \"pmids\": [\"31553715\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether a human equivalent anchor exists not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that ZW10's checkpoint function operates in mammalian meiosis, with Zw10 needed for Mad2 recruitment and euploid oocyte maturation.\",\n      \"evidence\": \"siRNA knockdown in mouse oocytes with Mad2 quantification and segregation analysis\",\n      \"pmids\": [\"31250100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether RZZ assembly/recruitment in oocytes mirrors mitotic hierarchy not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Introduced a post-translational control layer, showing PLK1 phosphorylation of ZW10 at Ser12 dynamically tunes the ZW10–Zwint-1 interaction to balance checkpoint silencing against segregation errors.\",\n      \"evidence\": \"In vitro PLK1 kinase assay, phospho-mutant/phospho-mimic expression, co-IP and segregation phenotyping\",\n      \"pmids\": [\"38402459\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Structural effect of Ser12 phosphorylation on the Zwint-1 interface not resolved\", \"Other ZW10 phosphosites/kinases not explored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ZW10 N-terminal hub coordinates partner switching among dynamitin, RINT-1, and Zwint-1 to toggle between mitotic checkpoint/segregation and interphase membrane-trafficking functions, and the atomic structure underlying RZZ assembly and these contacts, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No atomic structure of full RZZ or of ZW10–partner interfaces\", \"Cell-cycle signal that reassigns ZW10 between complexes unknown\", \"Quantitative partitioning of ZW10 pools across functions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 10, 12, 15]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 1, 2, 8, 11]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [9, 13]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [12, 13]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 6, 10, 11]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9, 12, 13]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\n      \"RZZ complex (ROD-Zwilch-ZW10)\",\n      \"syntaxin 18 SNARE complex (ZW10/RINT-1/p31)\"\n    ],\n    \"partners\": [\n      \"ROD\",\n      \"Zwilch\",\n      \"Zwint-1\",\n      \"dynamitin\",\n      \"RINT-1\",\n      \"syntaxin 18\",\n      \"PLK1\",\n      \"CAL1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}