{"gene":"ZWINT","run_date":"2026-06-11T09:02:07","timeline":{"discoveries":[{"year":2004,"finding":"Zwint-1 localizes to the outer kinetochore and is a component of the human Mis12 core complex, which also contains HEC1. HP1alpha and HP1gamma form a stable complex with hMis12, and double HP1 RNAi abolishes kinetochore localization of hMis12 and DC8, suggesting centromeric HP1 anchors the Mis12 complex that extends to outer Zwint-1 during mitosis.","method":"Co-immunoprecipitation, RNAi knockdown in HeLa cells, immunofluorescence localization","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, RNAi functional validation, replicated across S. pombe and human cells","pmids":["15502821"],"is_preprint":false},{"year":2004,"finding":"Zwint-1 is required and sufficient for kinetochore localization of ZW10 in HeLa cells; Zwint-1 interacts with the N-terminal domain of ZW10. siRNA depletion of Zwint-1 abolishes ZW10 kinetochore localization, causes premature chromosome segregation and chromosome bridge phenotype, and abolishes mitotic arrest in response to microtubule inhibitors, defining Zwint-1 as a spindle checkpoint component. Zwint-1 depletion also reduces kinetochore association of CENP-F and dynamitin but not BUB1.","method":"siRNA knockdown, immunofluorescence, co-immunoprecipitation domain mapping, microtubule inhibitor assays in HeLa cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA with multiple orthogonal phenotypic readouts, domain-level interaction mapping, replicated in subsequent studies","pmids":["15485811"],"is_preprint":false},{"year":2006,"finding":"HEC1 (NDC80) directly interacts with Zwint-1, and Zwint-1 in turn recruits ZW10 to kinetochores in a sequential manner during mitosis. HEC1 and Zwint-1 co-localize at kinetochores from prophase; ZW10 joins at prometaphase. Depletion of HEC1 impairs recruitment of both Zwint-1 and ZW10, while depletion of Zwint-1 abrogates ZW10 but not HEC1 kinetochore localization. This sequential recruitment is required for spindle checkpoint control and faithful chromosome segregation.","method":"Co-immunoprecipitation (M-phase specific), siRNA knockdown, immunofluorescence co-localization, chromosome segregation assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, siRNA epistasis with defined pathway order, multiple orthogonal phenotypic readouts, consistent with independent studies","pmids":["16732327"],"is_preprint":false},{"year":2011,"finding":"Aurora B (AurB) phosphorylates Zwint-1 at three novel sites (identified by tandem mass spectrometry) and this phosphorylation is required for assembly of the ROD-ZW10-Zwilch (RZZ) complex at kinetochores. A triple-Ala (phospho-dead) Zwint-1 mutant blocked kinetochore assembly of RZZ-dependent proteins and induced defects in chromosome movement; a triple-Glu (phospho-mimetic) mutant rendered cells resistant to AurB inhibition during prometaphase but prevented poleward dynein/dynactin/RZZ streaming required for SAC silencing at metaphase.","method":"In vitro kinase assay, tandem mass spectrometry phosphosite identification, AurB inhibitor (ZM447439) and kinase-dead AurB constructs, phospho-mutant expression (triple-Ala and triple-Glu), immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with MS phosphosite identification, mutagenesis (gain- and loss-of-function phospho-mutants), multiple functional readouts in one study","pmids":["21775627"],"is_preprint":false},{"year":2011,"finding":"The E3 ubiquitin ligase Terf/TRIM17 interacts with ZWINT via its coiled-coil domain and promotes ZWINT protein degradation. Terf overexpression decreases ZWINT protein levels in mammalian cells and reduces cell proliferation of MCF7 cells, while ZWINT overexpression increases proliferation.","method":"Yeast two-hybrid screening, co-immunoprecipitation, western blot, stable transfection proliferation assays, siRNA validation","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus Co-IP for interaction, western blot for degradation, proliferation assays; single lab with two orthogonal methods","pmids":["22023800"],"is_preprint":false},{"year":2015,"finding":"Zwint-1 is required for spindle assembly checkpoint function during oocyte meiosis I: Zwint-1 knockdown abrogates kinetochore recruitment of Mad2, causing accelerated meiosis, chromosome misalignment, and high aneuploidy. Zwint-1 is also required for Aurora C kinase-mediated correction of erroneous kinetochore-microtubule attachments during meiosis.","method":"siRNA knockdown in mouse oocytes, immunofluorescence for Mad2 kinetochore localization, chromosome alignment/aneuploidy analysis, Aurora C kinase inhibitor washout experiments","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined molecular readout (Mad2 localization), epistasis with Aurora C inhibitor, single lab","pmids":["26486467"],"is_preprint":false},{"year":2008,"finding":"Zwint-1 is a binding partner of the Rab GTPase Rab3c, with a unique residue in Rab3c determining binding efficiency; this interaction is distinct from Rab3c-rabphilin3a binding. Rab3c and Zwint-1 are co-expressed and co-localize in primary hippocampal neurons. SNAP25 binds to the same region of Zwint-1 as Rab3c, suggesting a role for Zwint-1 in presynaptic events regulated by Rab3 and SNAP25.","method":"Yeast two-hybrid, co-immunoprecipitation, co-localization in primary hippocampal neurons, domain competition assay with SNAP25","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus co-IP, co-localization in neurons, single lab with two orthogonal methods","pmids":["18625232"],"is_preprint":false},{"year":2002,"finding":"SIP30 (ZWINT) directly binds SNAP25, as demonstrated by GST pull-down and immunoprecipitation assays. Syntaxin co-immunoprecipitates with SIP30 indirectly, presumably via SNAP25. SIP30 is highly expressed in brain, particularly in inferior and superior colliculi.","method":"GST pull-down assay, co-immunoprecipitation from brain tissue","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pull-down plus Co-IP as orthogonal methods, single lab","pmids":["12068081"],"is_preprint":false},{"year":2009,"finding":"SIP30 (ZWINT) expression in the spinal cord is upregulated after chronic constriction injury (CCI); this upregulation is suppressed by intrathecal MEK inhibitor U0126, demonstrating ERK-dependent regulation of SIP30. An ERK-responsive region was identified in the rat sip30 promoter, and ERK activation promotes CREB recruitment to the sip30 promoter. SIP30 antisense knockdown attenuates neuropathic pain in the CCI model.","method":"CCI rat model, intrathecal inhibitor delivery, promoter analysis, ChIP for CREB, NGF stimulation in PC12 cells with MEK inhibitor","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple complementary methods (ChIP, promoter assay, inhibitor studies in vivo and in vitro), single lab","pmids":["19723624"],"is_preprint":false},{"year":2009,"finding":"SIP30 (ZWINT) is expressed in dorsal horn laminae of the spinal cord where nociceptive inputs synapse, co-localizing with CGRP and substance P. Anti-SIP30 siRNA in PC12 cells reduces the total pool of synaptic vesicles available for exocytosis, implicating SIP30 in vesicle exocytosis relevant to neuropathic pain.","method":"In situ localization/immunofluorescence in rat spinal cord, intrathecal antisense oligonucleotide in CCI model, siRNA in PC12 cells with vesicle secretion assay","journal":"Pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo antisense knockdown with pain behavioral readout, in vitro siRNA with vesicle exocytosis assay; single lab","pmids":["19748740"],"is_preprint":false},{"year":2014,"finding":"SIP30 (ZWINT) is upregulated in the rostral anterior cingulate cortex (rACC) after CCI in rats, and knockdown of SIP30 by intra-rACC shRNA reduces neuropathic pain-evoked place escape/avoidance behavior. This effect is mediated downstream of PKA and ERK signaling in the rACC. SIP30 knockdown suppresses mEPSC frequency, increases paired-pulse ratio, and decreases extracellular glutamate, implicating SIP30 in modulation of presynaptic glutamate release.","method":"CCI rat model, in vivo shRNA injection in rACC, PKA/ERK inhibitor pharmacology, whole-cell electrophysiology (mEPSC, paired-pulse ratio), glutamate measurement","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo shRNA with behavioral and electrophysiological readouts, pharmacological epistasis with PKA/ERK inhibitors, multiple orthogonal methods","pmids":["24403136"],"is_preprint":false},{"year":2014,"finding":"Peripherin isoforms Per-61 and Per-58 interact with SIP30 (ZWINT) through coiled-coil domains, and co-localize in cytoplasmic aggregates. Per-61 and Per-58 differentially alter the subcellular distribution of SIP30 and SNAP25 in primary motor neurons, suggesting peripherin regulates vesicle trafficking via SIP30.","method":"Yeast two-hybrid screening, co-localization in SW13vim(-) cells, immunofluorescence in primary motor neurons, domain mapping","journal":"Journal of neurochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, yeast two-hybrid plus co-localization, limited functional mechanistic data","pmids":["25113441"],"is_preprint":false},{"year":2020,"finding":"APC/C-Cdc20 ubiquitinates Zwint-1 in a D-box-dependent manner, leading to its proteasomal degradation during mitotic exit. Cdc20 overexpression decreases Zwint-1 levels (rescued by MG132); Cdc20 silencing causes Zwint-1 accumulation; Cdc20 interacts with wild-type but not D-box-deleted Zwint-1; in vivo ubiquitination assay confirmed Cdc20-promoted ubiquitin conjugation to Zwint-1.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, cycloheximide chase, MG132 proteasome inhibition, Cdc20 overexpression/siRNA knockdown, D-box deletion mutant in HEK293T and HeLa cells","journal":"Cell biochemistry and function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ubiquitination assay plus Co-IP plus genetic rescue with D-box mutant, multiple orthogonal methods, single lab","pmids":["31945194"],"is_preprint":false},{"year":2021,"finding":"In pancreatic cancer, ZWINT interacts with p53, promotes p53 ubiquitination and degradation, thereby reducing p53/p21 activity to drive cell proliferation. Hypoxia induces ZWINT expression via HIF1α binding to the ZWINT promoter (ChIP assay).","method":"Co-immunoprecipitation, immunofluorescence, protein ubiquitination assay, luciferase reporter assay for p53 activity, ChIP for HIF1α at ZWINT promoter, CCK8/colony formation/EDU/cell cycle assays, immunohistochemistry","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction, ubiquitination assay, ChIP for transcriptional regulation; multiple methods, single lab","pmids":["34900978"],"is_preprint":false},{"year":2023,"finding":"SIP30 (ZWINT) is involved in vesicle exocytosis from PC12 cells: anti-SIP30 siRNA reduced the pool of releasable vesicles and the rate of vesicle exocytosis (measured by FM1-43 fluorescence) without affecting endocytosis or vesicle recycling.","method":"siRNA knockdown in PC12 cells, FM1-43 fluorescence dye vesicle exocytosis assay","journal":"Biochemistry and biophysics reports","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — defined functional assay with siRNA, single lab, single method","pmids":["38188363"],"is_preprint":false},{"year":2004,"finding":"Inhibition of ZWINT-1 by antisense oligonucleotides in human cells results in centromere separation, chromosome aneuploidy, and micronuclei formation, phenocopying the Roberts syndrome cellular phenotype. This establishes ZWINT-1 as required for correct chromosome segregation, specifically in kinetochore assembly and spindle checkpoint steps.","method":"Antisense oligonucleotide inhibition, comparative genomic hybridization, spectral karyotyping, atomic force microscopy of chromosomes","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — antisense knockdown with cytogenetic phenotype, single lab, no direct molecular mechanism established","pmids":["15094189"],"is_preprint":false}],"current_model":"ZWINT (also known as SIP30/Zwint-1) is a dual-function protein: at the kinetochore, it localizes to the outer kinetochore downstream of HEC1/NDC80 and upstream of ZW10, recruits the RZZ (ROD-ZW10-Zwilch) complex via Aurora B-mediated phosphorylation, and is essential for spindle assembly checkpoint signaling and faithful chromosome segregation; its stability is regulated by APC/C-Cdc20-dependent ubiquitin-proteasomal degradation via a D-box motif, and by TRIM17/Terf E3 ligase-mediated degradation. In neurons, ZWINT/SIP30 directly binds SNAP25 (and indirectly associates with syntaxin), interacts with Rab3c at the same region, and promotes presynaptic vesicle exocytosis; in the anterior cingulate cortex and spinal cord its expression is regulated by ERK/PKA-CREB signaling and modulates glutamate release to contribute to neuropathic pain affect."},"narrative":{"mechanistic_narrative":"ZWINT (Zwint-1/SIP30) is a dual-function protein acting both as a structural and signaling hub at the mitotic kinetochore and as a regulator of presynaptic vesicle exocytosis in neurons [PMID:16732327, PMID:12068081]. At the outer kinetochore, ZWINT is a component of the Mis12 core complex and is recruited downstream of HEC1/NDC80, with which it directly interacts; it in turn is required and sufficient for kinetochore localization of ZW10, defining a sequential HEC1→ZWINT→ZW10 recruitment pathway essential for spindle assembly checkpoint signaling and faithful chromosome segregation [PMID:15502821, PMID:15485811, PMID:16732327]. Aurora B phosphorylates ZWINT at three sites, and this modification is required for assembly of the ROD-ZW10-Zwilch (RZZ) complex at kinetochores and for poleward streaming that silences the checkpoint, integrating ZWINT into both checkpoint activation and silencing [PMID:21775627]. ZWINT function extends to oocyte meiosis I, where it is required for kinetochore recruitment of Mad2 and for Aurora C-mediated correction of erroneous attachments [PMID:26486467]. ZWINT abundance is controlled by ubiquitin-proteasomal degradation through APC/C-Cdc20 acting on a D-box motif during mitotic exit and through the E3 ligase TRIM17/Terf [PMID:22023800, PMID:31945194]. In neurons, ZWINT/SIP30 directly binds SNAP25 (with syntaxin co-precipitating indirectly) and binds the Rab GTPase Rab3c at an overlapping region, and it is required for the pool of releasable synaptic vesicles and the rate of vesicle exocytosis [PMID:18625232, PMID:12068081, PMID:38188363]. In rat models of neuropathic pain, SIP30 is upregulated in the spinal cord and rostral anterior cingulate cortex through ERK/PKA-CREB signaling, where it modulates presynaptic glutamate release and contributes to pain-related affective behavior [PMID:19723624, PMID:24403136]. ZWINT also promotes p53 ubiquitination and degradation to drive proliferation in pancreatic cancer, where it is transcriptionally induced by HIF1α under hypoxia [PMID:34900978].","teleology":[{"year":2004,"claim":"Established ZWINT as an outer-kinetochore component of the Mis12 core complex and defined its position relative to HEC1, answering where in kinetochore architecture it sits.","evidence":"Co-IP, RNAi, and immunofluorescence in HeLa cells; HP1-dependent Mis12 anchoring","pmids":["15502821"],"confidence":"High","gaps":["Direct binding interface with Mis12 components not mapped","Functional consequence of HP1-Mis12 anchoring on ZWINT not dissected"]},{"year":2004,"claim":"Defined ZWINT as required and sufficient for ZW10 kinetochore recruitment and as a spindle checkpoint component, linking it to chromosome segregation fidelity.","evidence":"siRNA depletion with multiple phenotypic readouts and domain-mapped Co-IP to the ZW10 N-terminus in HeLa cells","pmids":["15485811"],"confidence":"High","gaps":["Structural basis of the ZWINT-ZW10 interaction not solved","Why CENP-F and dynamitin but not BUB1 depend on ZWINT not explained"]},{"year":2004,"claim":"Connected ZWINT loss to a Roberts-syndrome-like cytogenetic phenotype, reinforcing its role in chromosome segregation.","evidence":"Antisense oligonucleotide inhibition with CGH, spectral karyotyping, and atomic force microscopy","pmids":["15094189"],"confidence":"Low","gaps":["No direct molecular mechanism established beyond cytogenetic phenotype","Causal genetic link to Roberts syndrome not demonstrated"]},{"year":2006,"claim":"Resolved the temporal order of kinetochore assembly, showing HEC1 directly recruits ZWINT, which then recruits ZW10 sequentially through mitosis.","evidence":"M-phase Co-IP, siRNA epistasis, and co-localization time-course in mitotic cells","pmids":["16732327"],"confidence":"High","gaps":["Direct HEC1-ZWINT binding interface not mapped at residue level","Regulation of the recruitment timing not defined"]},{"year":2011,"claim":"Identified Aurora B phosphorylation of ZWINT as the switch controlling RZZ assembly and, in phosphomimetic form, checkpoint silencing — placing ZWINT under kinase regulation in both SAC activation and silencing.","evidence":"In vitro kinase assay with MS phosphosite mapping and gain/loss-of-function phospho-mutants","pmids":["21775627"],"confidence":"High","gaps":["How phosphorylation structurally enables RZZ docking unknown","Phosphatase reversing these sites not identified"]},{"year":2011,"claim":"Showed TRIM17/Terf controls ZWINT abundance and that ZWINT levels influence proliferation, introducing post-translational control of ZWINT.","evidence":"Yeast two-hybrid, Co-IP, western blot degradation, and proliferation assays in MCF7 cells","pmids":["22023800"],"confidence":"Medium","gaps":["Ubiquitination of ZWINT by TRIM17 not directly demonstrated","Cell-cycle timing of this degradation not defined"]},{"year":2015,"claim":"Extended ZWINT's checkpoint role to female meiosis, showing it is required for Mad2 recruitment and Aurora C-mediated attachment correction to prevent aneuploidy.","evidence":"siRNA in mouse oocytes with Mad2 localization, aneuploidy scoring, and Aurora C inhibitor washout","pmids":["26486467"],"confidence":"Medium","gaps":["Single-lab finding","Direct ZWINT-Mad2 or ZWINT-Aurora C interaction not shown"]},{"year":2020,"claim":"Defined APC/C-Cdc20 D-box-dependent ubiquitination as the mechanism degrading ZWINT at mitotic exit, explaining how its kinetochore pool is cleared.","evidence":"In vivo ubiquitination, Co-IP, CHX chase, MG132 rescue, and D-box deletion in HEK293T/HeLa cells","pmids":["31945194"],"confidence":"Medium","gaps":["Relationship between APC/C and TRIM17 routes of degradation unclear","Single-lab finding"]},{"year":2002,"claim":"Identified ZWINT/SIP30 as a direct SNAP25-binding protein enriched in brain, opening a synaptic function distinct from its mitotic role.","evidence":"GST pull-down and Co-IP from brain tissue","pmids":["12068081"],"confidence":"Medium","gaps":["Functional consequence of SNAP25 binding not tested here","Single-lab finding"]},{"year":2008,"claim":"Showed ZWINT/SIP30 binds Rab3c at the same region used by SNAP25 in hippocampal neurons, situating it within presynaptic vesicle machinery.","evidence":"Yeast two-hybrid, Co-IP, neuronal co-localization, and SNAP25 domain competition","pmids":["18625232"],"confidence":"Medium","gaps":["Whether SNAP25 and Rab3c binding are mutually exclusive in vivo unresolved","Single-lab finding"]},{"year":2009,"claim":"Linked SIP30 to neuropathic pain via ERK/CREB-driven transcriptional upregulation in spinal cord and a functional requirement for the synaptic vesicle pool.","evidence":"CCI rat model with MEK inhibitor, sip30 promoter analysis, CREB ChIP, and PC12 siRNA vesicle assays","pmids":["19723624","19748740"],"confidence":"Medium","gaps":["Direct neurotransmitter released by SIP30-dependent vesicles in spinal cord not identified","Single-lab findings"]},{"year":2014,"claim":"Localized SIP30's pain contribution to the rACC and tied it to presynaptic glutamate release downstream of PKA/ERK, connecting molecular function to pain affect.","evidence":"In vivo rACC shRNA, PKA/ERK inhibitor pharmacology, mEPSC/paired-pulse electrophysiology, and glutamate measurement in CCI rats","pmids":["24403136"],"confidence":"High","gaps":["Direct molecular target of SIP30 mediating glutamate release in rACC not defined","Link to its SNAP25/Rab3c partners in this context not tested"]},{"year":2014,"claim":"Reported peripherin isoforms as ZWINT/SIP30 partners that redistribute SIP30 and SNAP25 in motor neurons, hinting at cytoskeletal regulation of vesicle trafficking.","evidence":"Yeast two-hybrid, co-localization in SW13vim(-) cells, and immunofluorescence in primary motor neurons","pmids":["25113441"],"confidence":"Low","gaps":["Limited functional mechanistic data; awaits functional validation","Single-lab finding"]},{"year":2021,"claim":"Identified a ZWINT-p53 axis in pancreatic cancer, with ZWINT promoting p53 degradation and being induced by HIF1alpha, linking it to oncogenic proliferation.","evidence":"Co-IP, ubiquitination and p53 luciferase reporter assays, HIF1alpha ChIP, and proliferation assays","pmids":["34900978"],"confidence":"Medium","gaps":["Whether ZWINT acts as or recruits the E3 ligase for p53 not resolved","Single-lab finding"]},{"year":2023,"claim":"Confirmed SIP30's specific requirement for the releasable vesicle pool and exocytosis rate without affecting endocytosis or recycling.","evidence":"siRNA in PC12 cells with FM1-43 fluorescence vesicle assay","pmids":["38188363"],"confidence":"Medium","gaps":["Molecular step in exocytosis controlled by SIP30 not pinpointed","Single method, single lab"]},{"year":null,"claim":"How a single protein partitions between kinetochore checkpoint signaling and presynaptic exocytosis, and whether common partners or regulatory logic connect these roles, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model reconciling kinetochore and synaptic interactions","Tissue/cell-type determinants of which function dominates not defined","Whether degradation routes (APC/C, TRIM17) operate in neurons unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,6,7]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[11]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,7]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[9,14]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,2,3]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[7,10]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,12]}],"complexes":["Mis12 complex","kinetochore"],"partners":["HEC1","ZW10","SNAP25","RAB3C","CDC20","TRIM17","TP53","PRPH"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95229","full_name":"Outer kinetochore KNL1 complex subunit ZWINT","aliases":["ZW10 interactor","ZW10-interacting protein 1","Zwint-1"],"length_aa":277,"mass_kda":31.3,"function":"Acts as a component of the outer kinetochore KNL1 complex that serves as a docking point for spindle assembly checkpoint components and mediates microtubule-kinetochore interactions (PubMed:15094189, PubMed:15485811, PubMed:15824131, PubMed:16732327, PubMed:24530301, PubMed:27881301, PubMed:38459127, PubMed:38459128). Kinetochores, consisting of a centromere-associated inner segment and a microtubule-contacting outer segment, play a crucial role in chromosome segregation by mediating the physical connection between centromeric DNA and spindle microtubules (PubMed:15094189, PubMed:15485811, PubMed:16732327). The outer kinetochore is made up of the ten-subunit KMN network, comprising the MIS12, NDC80 and KNL1 complexes, and auxiliary microtubule-associated components; together they connect the outer kinetochore with the inner kinetochore, bind microtubules, and mediate interactions with mitotic checkpoint proteins that delay anaphase until chromosomes are bioriented on the spindle (PubMed:15094189, PubMed:15485811, PubMed:15824131, PubMed:16732327, PubMed:24530301, PubMed:38459127, PubMed:38459128). Targets the RZZ complex to the kinetochore at prometaphase (PubMed:15485811). Recruits MAD2L1 to the kinetochore, but is not required for BUB1B localization (By similarity). In addition to orienting mitotic chromosomes, it is also essential for alignment of homologous chromosomes during meiotic metaphase I (By similarity). In meiosis I, required to activate the spindle assembly checkpoint at unattached kinetochores to correct erroneous kinetochore-microtubule attachments (PubMed:15485811)","subcellular_location":"Nucleus; Chromosome, centromere, kinetochore","url":"https://www.uniprot.org/uniprotkb/O95229/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZWINT","classification":"Not Classified","n_dependent_lines":662,"n_total_lines":1208,"dependency_fraction":0.5480132450331126},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"MIS12","stoichiometry":4.0},{"gene":"HSPA4","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ZWINT","total_profiled":1310},"omim":[{"mim_id":"609178","title":"MIS12 KINETOCHORE COMPLEX COMPONENT; MIS12","url":"https://www.omim.org/entry/609178"},{"mim_id":"609177","title":"ZW10 INTERACTING KINETOCHORE PROTEIN; ZWINT","url":"https://www.omim.org/entry/609177"},{"mim_id":"609176","title":"POLYAMINE-MODULATED FACTOR 1; PMF1","url":"https://www.omim.org/entry/609176"},{"mim_id":"609175","title":"DSN1, MIS12 KINETOCHORE COMPLEX COMPONENT; DSN1","url":"https://www.omim.org/entry/609175"},{"mim_id":"609174","title":"NSL1, MIS12 KINETOCHORE COMPLEX COMPONENT; NSL1","url":"https://www.omim.org/entry/609174"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Nuclear bodies","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":39.2},{"tissue":"lymphoid tissue","ntpm":40.5}],"url":"https://www.proteinatlas.org/search/ZWINT"},"hgnc":{"alias_symbol":["KNTC2AP","SIP30","Zwint1"],"prev_symbol":[]},"alphafold":{"accession":"O95229","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95229","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95229-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95229-F1-predicted_aligned_error_v6.png","plddt_mean":78.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZWINT","jax_strain_url":"https://www.jax.org/strain/search?query=ZWINT"},"sequence":{"accession":"O95229","fasta_url":"https://rest.uniprot.org/uniprotkb/O95229.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95229/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95229"}},"corpus_meta":[{"pmid":"15502821","id":"PMC_15502821","title":"A conserved Mis12 centromere complex is linked to heterochromatic HP1 and outer kinetochore protein Zwint-1.","date":"2004","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15502821","citation_count":222,"is_preprint":false},{"pmid":"15485811","id":"PMC_15485811","title":"Human Zwint-1 specifies localization of Zeste White 10 to kinetochores and is essential for mitotic checkpoint signaling.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15485811","citation_count":111,"is_preprint":false},{"pmid":"16732327","id":"PMC_16732327","title":"Hec1 sequentially recruits Zwint-1 and ZW10 to kinetochores for faithful chromosome segregation and spindle checkpoint control.","date":"2006","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/16732327","citation_count":55,"is_preprint":false},{"pmid":"22023800","id":"PMC_22023800","title":"Terf/TRIM17 stimulates degradation of kinetochore protein ZWINT and regulates cell proliferation.","date":"2011","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22023800","citation_count":50,"is_preprint":false},{"pmid":"21775627","id":"PMC_21775627","title":"Zwint-1 is a novel Aurora B substrate required for the assembly of a dynein-binding platform on kinetochores.","date":"2011","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/21775627","citation_count":44,"is_preprint":false},{"pmid":"26486467","id":"PMC_26486467","title":"Zwint-1 is required for spindle assembly checkpoint function and kinetochore-microtubule attachment during oocyte meiosis.","date":"2015","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/26486467","citation_count":42,"is_preprint":false},{"pmid":"24403136","id":"PMC_24403136","title":"SIP30 is required for neuropathic pain-evoked aversion in rats.","date":"2014","source":"The Journal of neuroscience : the official journal of the Society for 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34744456","citation_count":11,"is_preprint":false},{"pmid":"32913455","id":"PMC_32913455","title":"Involvement of the NF-κB signaling pathway in proliferation and invasion inhibited by Zwint-1 deficiency in Pancreatic Cancer Cells.","date":"2020","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/32913455","citation_count":10,"is_preprint":false},{"pmid":"25113441","id":"PMC_25113441","title":"A two-hybrid screen identifies an unconventional role for the intermediate filament peripherin in regulating the subcellular distribution of the SNAP25-interacting protein, SIP30.","date":"2014","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25113441","citation_count":10,"is_preprint":false},{"pmid":"31945194","id":"PMC_31945194","title":"Anaphase-promoting complex/cyclosome-Cdc-20 promotes Zwint-1 degradation.","date":"2020","source":"Cell biochemistry and 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risk model for bladder cancer and functionally characterizes ZWINT as a potential oncogenic factor.","date":"2026","source":"Translational andrology and urology","url":"https://pubmed.ncbi.nlm.nih.gov/41809788","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16887,"output_tokens":4529,"usd":0.059298,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12553,"output_tokens":4623,"usd":0.08917,"stage2_stop_reason":"end_turn"},"total_usd":0.148468,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"Zwint-1 localizes to the outer kinetochore and is a component of the human Mis12 core complex, which also contains HEC1. HP1alpha and HP1gamma form a stable complex with hMis12, and double HP1 RNAi abolishes kinetochore localization of hMis12 and DC8, suggesting centromeric HP1 anchors the Mis12 complex that extends to outer Zwint-1 during mitosis.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown in HeLa cells, immunofluorescence localization\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, RNAi functional validation, replicated across S. pombe and human cells\",\n      \"pmids\": [\"15502821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Zwint-1 is required and sufficient for kinetochore localization of ZW10 in HeLa cells; Zwint-1 interacts with the N-terminal domain of ZW10. siRNA depletion of Zwint-1 abolishes ZW10 kinetochore localization, causes premature chromosome segregation and chromosome bridge phenotype, and abolishes mitotic arrest in response to microtubule inhibitors, defining Zwint-1 as a spindle checkpoint component. Zwint-1 depletion also reduces kinetochore association of CENP-F and dynamitin but not BUB1.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, co-immunoprecipitation domain mapping, microtubule inhibitor assays in HeLa cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA with multiple orthogonal phenotypic readouts, domain-level interaction mapping, replicated in subsequent studies\",\n      \"pmids\": [\"15485811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"HEC1 (NDC80) directly interacts with Zwint-1, and Zwint-1 in turn recruits ZW10 to kinetochores in a sequential manner during mitosis. HEC1 and Zwint-1 co-localize at kinetochores from prophase; ZW10 joins at prometaphase. Depletion of HEC1 impairs recruitment of both Zwint-1 and ZW10, while depletion of Zwint-1 abrogates ZW10 but not HEC1 kinetochore localization. This sequential recruitment is required for spindle checkpoint control and faithful chromosome segregation.\",\n      \"method\": \"Co-immunoprecipitation (M-phase specific), siRNA knockdown, immunofluorescence co-localization, chromosome segregation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, siRNA epistasis with defined pathway order, multiple orthogonal phenotypic readouts, consistent with independent studies\",\n      \"pmids\": [\"16732327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Aurora B (AurB) phosphorylates Zwint-1 at three novel sites (identified by tandem mass spectrometry) and this phosphorylation is required for assembly of the ROD-ZW10-Zwilch (RZZ) complex at kinetochores. A triple-Ala (phospho-dead) Zwint-1 mutant blocked kinetochore assembly of RZZ-dependent proteins and induced defects in chromosome movement; a triple-Glu (phospho-mimetic) mutant rendered cells resistant to AurB inhibition during prometaphase but prevented poleward dynein/dynactin/RZZ streaming required for SAC silencing at metaphase.\",\n      \"method\": \"In vitro kinase assay, tandem mass spectrometry phosphosite identification, AurB inhibitor (ZM447439) and kinase-dead AurB constructs, phospho-mutant expression (triple-Ala and triple-Glu), immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with MS phosphosite identification, mutagenesis (gain- and loss-of-function phospho-mutants), multiple functional readouts in one study\",\n      \"pmids\": [\"21775627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The E3 ubiquitin ligase Terf/TRIM17 interacts with ZWINT via its coiled-coil domain and promotes ZWINT protein degradation. Terf overexpression decreases ZWINT protein levels in mammalian cells and reduces cell proliferation of MCF7 cells, while ZWINT overexpression increases proliferation.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, western blot, stable transfection proliferation assays, siRNA validation\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus Co-IP for interaction, western blot for degradation, proliferation assays; single lab with two orthogonal methods\",\n      \"pmids\": [\"22023800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Zwint-1 is required for spindle assembly checkpoint function during oocyte meiosis I: Zwint-1 knockdown abrogates kinetochore recruitment of Mad2, causing accelerated meiosis, chromosome misalignment, and high aneuploidy. Zwint-1 is also required for Aurora C kinase-mediated correction of erroneous kinetochore-microtubule attachments during meiosis.\",\n      \"method\": \"siRNA knockdown in mouse oocytes, immunofluorescence for Mad2 kinetochore localization, chromosome alignment/aneuploidy analysis, Aurora C kinase inhibitor washout experiments\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined molecular readout (Mad2 localization), epistasis with Aurora C inhibitor, single lab\",\n      \"pmids\": [\"26486467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Zwint-1 is a binding partner of the Rab GTPase Rab3c, with a unique residue in Rab3c determining binding efficiency; this interaction is distinct from Rab3c-rabphilin3a binding. Rab3c and Zwint-1 are co-expressed and co-localize in primary hippocampal neurons. SNAP25 binds to the same region of Zwint-1 as Rab3c, suggesting a role for Zwint-1 in presynaptic events regulated by Rab3 and SNAP25.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, co-localization in primary hippocampal neurons, domain competition assay with SNAP25\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus co-IP, co-localization in neurons, single lab with two orthogonal methods\",\n      \"pmids\": [\"18625232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SIP30 (ZWINT) directly binds SNAP25, as demonstrated by GST pull-down and immunoprecipitation assays. Syntaxin co-immunoprecipitates with SIP30 indirectly, presumably via SNAP25. SIP30 is highly expressed in brain, particularly in inferior and superior colliculi.\",\n      \"method\": \"GST pull-down assay, co-immunoprecipitation from brain tissue\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pull-down plus Co-IP as orthogonal methods, single lab\",\n      \"pmids\": [\"12068081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SIP30 (ZWINT) expression in the spinal cord is upregulated after chronic constriction injury (CCI); this upregulation is suppressed by intrathecal MEK inhibitor U0126, demonstrating ERK-dependent regulation of SIP30. An ERK-responsive region was identified in the rat sip30 promoter, and ERK activation promotes CREB recruitment to the sip30 promoter. SIP30 antisense knockdown attenuates neuropathic pain in the CCI model.\",\n      \"method\": \"CCI rat model, intrathecal inhibitor delivery, promoter analysis, ChIP for CREB, NGF stimulation in PC12 cells with MEK inhibitor\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary methods (ChIP, promoter assay, inhibitor studies in vivo and in vitro), single lab\",\n      \"pmids\": [\"19723624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SIP30 (ZWINT) is expressed in dorsal horn laminae of the spinal cord where nociceptive inputs synapse, co-localizing with CGRP and substance P. Anti-SIP30 siRNA in PC12 cells reduces the total pool of synaptic vesicles available for exocytosis, implicating SIP30 in vesicle exocytosis relevant to neuropathic pain.\",\n      \"method\": \"In situ localization/immunofluorescence in rat spinal cord, intrathecal antisense oligonucleotide in CCI model, siRNA in PC12 cells with vesicle secretion assay\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo antisense knockdown with pain behavioral readout, in vitro siRNA with vesicle exocytosis assay; single lab\",\n      \"pmids\": [\"19748740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SIP30 (ZWINT) is upregulated in the rostral anterior cingulate cortex (rACC) after CCI in rats, and knockdown of SIP30 by intra-rACC shRNA reduces neuropathic pain-evoked place escape/avoidance behavior. This effect is mediated downstream of PKA and ERK signaling in the rACC. SIP30 knockdown suppresses mEPSC frequency, increases paired-pulse ratio, and decreases extracellular glutamate, implicating SIP30 in modulation of presynaptic glutamate release.\",\n      \"method\": \"CCI rat model, in vivo shRNA injection in rACC, PKA/ERK inhibitor pharmacology, whole-cell electrophysiology (mEPSC, paired-pulse ratio), glutamate measurement\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo shRNA with behavioral and electrophysiological readouts, pharmacological epistasis with PKA/ERK inhibitors, multiple orthogonal methods\",\n      \"pmids\": [\"24403136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Peripherin isoforms Per-61 and Per-58 interact with SIP30 (ZWINT) through coiled-coil domains, and co-localize in cytoplasmic aggregates. Per-61 and Per-58 differentially alter the subcellular distribution of SIP30 and SNAP25 in primary motor neurons, suggesting peripherin regulates vesicle trafficking via SIP30.\",\n      \"method\": \"Yeast two-hybrid screening, co-localization in SW13vim(-) cells, immunofluorescence in primary motor neurons, domain mapping\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, yeast two-hybrid plus co-localization, limited functional mechanistic data\",\n      \"pmids\": [\"25113441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"APC/C-Cdc20 ubiquitinates Zwint-1 in a D-box-dependent manner, leading to its proteasomal degradation during mitotic exit. Cdc20 overexpression decreases Zwint-1 levels (rescued by MG132); Cdc20 silencing causes Zwint-1 accumulation; Cdc20 interacts with wild-type but not D-box-deleted Zwint-1; in vivo ubiquitination assay confirmed Cdc20-promoted ubiquitin conjugation to Zwint-1.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, cycloheximide chase, MG132 proteasome inhibition, Cdc20 overexpression/siRNA knockdown, D-box deletion mutant in HEK293T and HeLa cells\",\n      \"journal\": \"Cell biochemistry and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ubiquitination assay plus Co-IP plus genetic rescue with D-box mutant, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"31945194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In pancreatic cancer, ZWINT interacts with p53, promotes p53 ubiquitination and degradation, thereby reducing p53/p21 activity to drive cell proliferation. Hypoxia induces ZWINT expression via HIF1α binding to the ZWINT promoter (ChIP assay).\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, protein ubiquitination assay, luciferase reporter assay for p53 activity, ChIP for HIF1α at ZWINT promoter, CCK8/colony formation/EDU/cell cycle assays, immunohistochemistry\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction, ubiquitination assay, ChIP for transcriptional regulation; multiple methods, single lab\",\n      \"pmids\": [\"34900978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SIP30 (ZWINT) is involved in vesicle exocytosis from PC12 cells: anti-SIP30 siRNA reduced the pool of releasable vesicles and the rate of vesicle exocytosis (measured by FM1-43 fluorescence) without affecting endocytosis or vesicle recycling.\",\n      \"method\": \"siRNA knockdown in PC12 cells, FM1-43 fluorescence dye vesicle exocytosis assay\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — defined functional assay with siRNA, single lab, single method\",\n      \"pmids\": [\"38188363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Inhibition of ZWINT-1 by antisense oligonucleotides in human cells results in centromere separation, chromosome aneuploidy, and micronuclei formation, phenocopying the Roberts syndrome cellular phenotype. This establishes ZWINT-1 as required for correct chromosome segregation, specifically in kinetochore assembly and spindle checkpoint steps.\",\n      \"method\": \"Antisense oligonucleotide inhibition, comparative genomic hybridization, spectral karyotyping, atomic force microscopy of chromosomes\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — antisense knockdown with cytogenetic phenotype, single lab, no direct molecular mechanism established\",\n      \"pmids\": [\"15094189\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZWINT (also known as SIP30/Zwint-1) is a dual-function protein: at the kinetochore, it localizes to the outer kinetochore downstream of HEC1/NDC80 and upstream of ZW10, recruits the RZZ (ROD-ZW10-Zwilch) complex via Aurora B-mediated phosphorylation, and is essential for spindle assembly checkpoint signaling and faithful chromosome segregation; its stability is regulated by APC/C-Cdc20-dependent ubiquitin-proteasomal degradation via a D-box motif, and by TRIM17/Terf E3 ligase-mediated degradation. In neurons, ZWINT/SIP30 directly binds SNAP25 (and indirectly associates with syntaxin), interacts with Rab3c at the same region, and promotes presynaptic vesicle exocytosis; in the anterior cingulate cortex and spinal cord its expression is regulated by ERK/PKA-CREB signaling and modulates glutamate release to contribute to neuropathic pain affect.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZWINT (Zwint-1/SIP30) is a dual-function protein acting both as a structural and signaling hub at the mitotic kinetochore and as a regulator of presynaptic vesicle exocytosis in neurons [#2, #7]. At the outer kinetochore, ZWINT is a component of the Mis12 core complex and is recruited downstream of HEC1/NDC80, with which it directly interacts; it in turn is required and sufficient for kinetochore localization of ZW10, defining a sequential HEC1\\u2192ZWINT\\u2192ZW10 recruitment pathway essential for spindle assembly checkpoint signaling and faithful chromosome segregation [#0, #1, #2]. Aurora B phosphorylates ZWINT at three sites, and this modification is required for assembly of the ROD-ZW10-Zwilch (RZZ) complex at kinetochores and for poleward streaming that silences the checkpoint, integrating ZWINT into both checkpoint activation and silencing [#3]. ZWINT function extends to oocyte meiosis I, where it is required for kinetochore recruitment of Mad2 and for Aurora C-mediated correction of erroneous attachments [#5]. ZWINT abundance is controlled by ubiquitin-proteasomal degradation through APC/C-Cdc20 acting on a D-box motif during mitotic exit and through the E3 ligase TRIM17/Terf [#4, #12]. In neurons, ZWINT/SIP30 directly binds SNAP25 (with syntaxin co-precipitating indirectly) and binds the Rab GTPase Rab3c at an overlapping region, and it is required for the pool of releasable synaptic vesicles and the rate of vesicle exocytosis [#6, #7, #14]. In rat models of neuropathic pain, SIP30 is upregulated in the spinal cord and rostral anterior cingulate cortex through ERK/PKA-CREB signaling, where it modulates presynaptic glutamate release and contributes to pain-related affective behavior [#8, #10]. ZWINT also promotes p53 ubiquitination and degradation to drive proliferation in pancreatic cancer, where it is transcriptionally induced by HIF1\\u03b1 under hypoxia [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established ZWINT as an outer-kinetochore component of the Mis12 core complex and defined its position relative to HEC1, answering where in kinetochore architecture it sits.\",\n      \"evidence\": \"Co-IP, RNAi, and immunofluorescence in HeLa cells; HP1-dependent Mis12 anchoring\",\n      \"pmids\": [\"15502821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface with Mis12 components not mapped\", \"Functional consequence of HP1-Mis12 anchoring on ZWINT not dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined ZWINT as required and sufficient for ZW10 kinetochore recruitment and as a spindle checkpoint component, linking it to chromosome segregation fidelity.\",\n      \"evidence\": \"siRNA depletion with multiple phenotypic readouts and domain-mapped Co-IP to the ZW10 N-terminus in HeLa cells\",\n      \"pmids\": [\"15485811\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the ZWINT-ZW10 interaction not solved\", \"Why CENP-F and dynamitin but not BUB1 depend on ZWINT not explained\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected ZWINT loss to a Roberts-syndrome-like cytogenetic phenotype, reinforcing its role in chromosome segregation.\",\n      \"evidence\": \"Antisense oligonucleotide inhibition with CGH, spectral karyotyping, and atomic force microscopy\",\n      \"pmids\": [\"15094189\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct molecular mechanism established beyond cytogenetic phenotype\", \"Causal genetic link to Roberts syndrome not demonstrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the temporal order of kinetochore assembly, showing HEC1 directly recruits ZWINT, which then recruits ZW10 sequentially through mitosis.\",\n      \"evidence\": \"M-phase Co-IP, siRNA epistasis, and co-localization time-course in mitotic cells\",\n      \"pmids\": [\"16732327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct HEC1-ZWINT binding interface not mapped at residue level\", \"Regulation of the recruitment timing not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified Aurora B phosphorylation of ZWINT as the switch controlling RZZ assembly and, in phosphomimetic form, checkpoint silencing — placing ZWINT under kinase regulation in both SAC activation and silencing.\",\n      \"evidence\": \"In vitro kinase assay with MS phosphosite mapping and gain/loss-of-function phospho-mutants\",\n      \"pmids\": [\"21775627\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation structurally enables RZZ docking unknown\", \"Phosphatase reversing these sites not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed TRIM17/Terf controls ZWINT abundance and that ZWINT levels influence proliferation, introducing post-translational control of ZWINT.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, western blot degradation, and proliferation assays in MCF7 cells\",\n      \"pmids\": [\"22023800\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination of ZWINT by TRIM17 not directly demonstrated\", \"Cell-cycle timing of this degradation not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended ZWINT's checkpoint role to female meiosis, showing it is required for Mad2 recruitment and Aurora C-mediated attachment correction to prevent aneuploidy.\",\n      \"evidence\": \"siRNA in mouse oocytes with Mad2 localization, aneuploidy scoring, and Aurora C inhibitor washout\",\n      \"pmids\": [\"26486467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"Direct ZWINT-Mad2 or ZWINT-Aurora C interaction not shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined APC/C-Cdc20 D-box-dependent ubiquitination as the mechanism degrading ZWINT at mitotic exit, explaining how its kinetochore pool is cleared.\",\n      \"evidence\": \"In vivo ubiquitination, Co-IP, CHX chase, MG132 rescue, and D-box deletion in HEK293T/HeLa cells\",\n      \"pmids\": [\"31945194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between APC/C and TRIM17 routes of degradation unclear\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified ZWINT/SIP30 as a direct SNAP25-binding protein enriched in brain, opening a synaptic function distinct from its mitotic role.\",\n      \"evidence\": \"GST pull-down and Co-IP from brain tissue\",\n      \"pmids\": [\"12068081\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of SNAP25 binding not tested here\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed ZWINT/SIP30 binds Rab3c at the same region used by SNAP25 in hippocampal neurons, situating it within presynaptic vesicle machinery.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, neuronal co-localization, and SNAP25 domain competition\",\n      \"pmids\": [\"18625232\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SNAP25 and Rab3c binding are mutually exclusive in vivo unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linked SIP30 to neuropathic pain via ERK/CREB-driven transcriptional upregulation in spinal cord and a functional requirement for the synaptic vesicle pool.\",\n      \"evidence\": \"CCI rat model with MEK inhibitor, sip30 promoter analysis, CREB ChIP, and PC12 siRNA vesicle assays\",\n      \"pmids\": [\"19723624\", \"19748740\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct neurotransmitter released by SIP30-dependent vesicles in spinal cord not identified\", \"Single-lab findings\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Localized SIP30's pain contribution to the rACC and tied it to presynaptic glutamate release downstream of PKA/ERK, connecting molecular function to pain affect.\",\n      \"evidence\": \"In vivo rACC shRNA, PKA/ERK inhibitor pharmacology, mEPSC/paired-pulse electrophysiology, and glutamate measurement in CCI rats\",\n      \"pmids\": [\"24403136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular target of SIP30 mediating glutamate release in rACC not defined\", \"Link to its SNAP25/Rab3c partners in this context not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Reported peripherin isoforms as ZWINT/SIP30 partners that redistribute SIP30 and SNAP25 in motor neurons, hinting at cytoskeletal regulation of vesicle trafficking.\",\n      \"evidence\": \"Yeast two-hybrid, co-localization in SW13vim(-) cells, and immunofluorescence in primary motor neurons\",\n      \"pmids\": [\"25113441\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Limited functional mechanistic data; awaits functional validation\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified a ZWINT-p53 axis in pancreatic cancer, with ZWINT promoting p53 degradation and being induced by HIF1alpha, linking it to oncogenic proliferation.\",\n      \"evidence\": \"Co-IP, ubiquitination and p53 luciferase reporter assays, HIF1alpha ChIP, and proliferation assays\",\n      \"pmids\": [\"34900978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ZWINT acts as or recruits the E3 ligase for p53 not resolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Confirmed SIP30's specific requirement for the releasable vesicle pool and exocytosis rate without affecting endocytosis or recycling.\",\n      \"evidence\": \"siRNA in PC12 cells with FM1-43 fluorescence vesicle assay\",\n      \"pmids\": [\"38188363\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular step in exocytosis controlled by SIP30 not pinpointed\", \"Single method, single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single protein partitions between kinetochore checkpoint signaling and presynaptic exocytosis, and whether common partners or regulatory logic connect these roles, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model reconciling kinetochore and synaptic interactions\", \"Tissue/cell-type determinants of which function dominates not defined\", \"Whether degradation routes (APC/C, TRIM17) operate in neurons unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 6, 7]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [9, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [7, 10]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 12]}\n    ],\n    \"complexes\": [\"Mis12 complex\", \"kinetochore\"],\n    \"partners\": [\"HEC1\", \"ZW10\", \"SNAP25\", \"RAB3C\", \"CDC20\", \"TRIM17\", \"TP53\", \"PRPH\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}