{"gene":"NIN","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1996,"finding":"Ninein (NIN) was identified as a novel centrosomal protein with a predicted molecular weight of ~245–249 kDa, containing extensive coiled-coil domains, an EF-hand-like domain, a potential GTP-binding site, and four leucine zipper domains. Immunofluorescence and immunoelectron microscopy localized ninein specifically to the pericentriolar matrix throughout the cell cycle, with additional nuclear localization observed at interphase in fibroblasts and association with the mitotic spindle during mitosis.","method":"cDNA cloning, immunofluorescence, immunoelectron microscopy, domain analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — original molecular characterization with multiple orthogonal methods (cloning, IF, IEM); foundational paper with >130 citations","pmids":["8834802"],"is_preprint":false},{"year":2002,"finding":"CEP110 and ninein co-localize in a specific domain of the centrosome corresponding to the open end of the centrosome tube, the site of daughter-to-mother centrosome maturation. Microinjection of antibodies against ninein into metaphase cells disrupted reformation of the centrosome tubular architecture following cell division and abolished centrosome function as a microtubule-organizing center (MTOC), demonstrating ninein is required for MTOC function and centrosome maturation.","method":"Immunofluorescence, co-localization mapping, antibody microinjection into metaphase HeLa and PtK2 cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — direct functional loss-of-function by antibody microinjection with clear MTOC phenotype; replicated across two cell types","pmids":["11956314"],"is_preprint":false},{"year":2002,"finding":"PCM-1 depletion by siRNA or antibody microinjection reduced the targeting of ninein (as well as centrin and pericentrin) to the centrosome, indicating that PCM-1-containing centriolar satellites are required for the dynactin-dependent recruitment of ninein to the centrosome. Furthermore, ninein depletion itself disrupted radial microtubule organization without affecting nucleation, placing ninein downstream of PCM-1 in the centrosomal recruitment pathway.","method":"siRNA knockdown, antibody microinjection, immunofluorescence, microtubule organization assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal loss-of-function experiments with clear pathway placement; >400 citations","pmids":["12403812"],"is_preprint":false},{"year":2005,"finding":"Ninein localizes to subdistal appendages of the mother centriole via its C-terminus and interacts with γ-tubulin ring complexes (γ-TuRC) via its N-terminus. Expression of a C-terminal ninein fragment displaced endogenous ninein and γ-TuRC from the centrosome, causing both microtubule nucleation and anchoring defects. A construct lacking the central coiled-coil domain (but containing both termini) displaced ninein without affecting γ-TuRC localization, producing anchoring defects only, thereby uncoupling nucleation from anchoring. This demonstrated that ninein acts as a molecular link between γ-TuRC docking (nucleation) and microtubule anchoring at subdistal appendages.","method":"Domain deletion/expression constructs, immunofluorescence, microtubule regrowth assay, γ-TuRC co-localization","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — domain dissection with multiple constructs distinguishing two separable activities; >228 citations","pmids":["15784680"],"is_preprint":false},{"year":2004,"finding":"NIN was identified as the gene fused to PDGFRB in a t(5;14)(q33;q24) translocation associated with a chronic myeloproliferative disorder with eosinophilia. NIN encodes a centrosomal protein with CEP110-like function, and the NIN-PDGFRB fusion protein was detected by RT-PCR. The patient achieved hematological and cytogenetic remission with imatinib, confirming the fusion's role in disease.","method":"FISH, RT-PCR, candidate gene sequencing, clinical imatinib treatment response","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — direct identification of fusion gene by molecular methods; single case report","pmids":["15087377"],"is_preprint":false},{"year":2011,"finding":"Super-resolution 3D-structured illumination microscopy (3D-SIM) analysis of human centrosomes revealed that ninein localizes to appendage structures of the mother centriole, forming rings with multiple density masses at the subdistal appendages. The number of these density masses was strongly reduced during mitosis, indicating cell cycle-dependent reorganization of ninein at centrosomal appendages.","method":"3D-structured illumination microscopy (3D-SIM), site-specific antibodies, cell cycle staging","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — super-resolution structural analysis with quantitative assessment of cell cycle dynamics; >265 citations","pmids":["21399614"],"is_preprint":false},{"year":2012,"finding":"3D-SIM analysis of 18 centriole and PCM components confirmed that ninein localizes to subdistal appendage structures at specific radial distances from centriole walls, forming ring patterns with discernible density masses during interphase, consistent with its role at mother centriole appendages.","method":"3D-structured illumination microscopy, comparative localization of 18 centrosomal components","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 1 — super-resolution structural mapping with comprehensive multi-protein comparison; >268 citations","pmids":["23213374"],"is_preprint":false},{"year":2012,"finding":"Positive selection analysis revealed that NIN evolved adaptively during anthropoid primate evolution. NIN is functionally required for maintaining asymmetric neurogenic divisions of radial glial cells (RGCs). Selection on NIN was significantly associated with neonatal brain size in catarrhines and potentially with variation in neuron number, suggesting NIN's role in RGC neurogenic divisions contributed to primate brain evolution.","method":"Molecular evolution analysis (dN/dS), comparative phenotypic association analysis across primate lineages","journal":"Genes, brain, and behavior","confidence":"Low","confidence_rationale":"Tier 4 — evolutionary/computational analysis; functional role in RGC divisions cited from prior work, not directly demonstrated in this paper","pmids":["22937743"],"is_preprint":false},{"year":2013,"finding":"Homozygosity mapping and whole-exome sequencing in a consanguineous family with a SEMDJL2-like skeletal dysplasia phenotype identified homozygous missense mutations in NIN (Ninein). Evidence is presented that mutant Ninein is causative, based on its functional relationship with KIF22 and other centrosome-associated proteins linked to chromosome congression and ciliogenesis, and on the prior identification of compound heterozygous NIN mutations in microcephalic primordial dwarfism, supporting a fundamental role of Ninein in skeletal development.","method":"Homozygosity mapping, whole-exome sequencing, segregation analysis, functional relationship analysis","journal":"Matrix biology","confidence":"Medium","confidence_rationale":"Tier 3 — genetic identification with functional inference; no direct biochemical validation of the mutant protein in this study","pmids":["23665482"],"is_preprint":false},{"year":2014,"finding":"BioID proximity-dependent biotinylation of centriole duplication proteins identified ninein within the centrosome proximity interaction network, associating it with centriolar satellite components and centriole duplication regulators including CEP63, placing NIN in the centrosome protein interaction landscape.","method":"BioID (proximity-dependent biotin identification), mass spectrometry","journal":"Current biology","confidence":"Medium","confidence_rationale":"Tier 3 — proximity biotinylation identifies interaction landscape but does not establish direct physical binding","pmids":["24613305"],"is_preprint":false},{"year":2015,"finding":"High-throughput AP-MS (BioPlex network) identified protein-protein interaction partners for ninein in HEK293T cells as part of a proteome-scale interaction map, placing NIN within protein communities related to centrosome function.","method":"Affinity purification-mass spectrometry (AP-MS), network analysis","journal":"Cell","confidence":"Low","confidence_rationale":"Tier 3 — large-scale AP-MS; NIN interactions identified as part of proteome-wide screen without specific validation","pmids":["26186194"],"is_preprint":false},{"year":2015,"finding":"BioID mapping of the centrosome-cilium interface using 58 bait proteins generated a protein topology network that included ninein, placing it within the centrosome-cilium interaction landscape and linking it to processes including ciliogenesis and centriolar satellite biogenesis.","method":"BioID (proximity-dependent biotinylation), mass spectrometry, high-resolution phenotypic profiling","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2-3 — systematic proximity interaction mapping of centrosome with functional validation of hits; NIN specifically placed in centrosome-cilium network","pmids":["26638075"],"is_preprint":false},{"year":2022,"finding":"OpenCell endogenous tagging and live-cell imaging confirmed ninein localization to the centrosome in human cells under near-endogenous expression conditions, providing high-confidence subcellular localization data as part of a systematic proteome cartography effort.","method":"CRISPR endogenous tagging, confocal live-cell imaging, AP-MS","journal":"Science","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous-level expression with direct imaging; part of large systematic study","pmids":["35271311"],"is_preprint":false},{"year":2025,"finding":"Multi-omics analysis of TCGA-BRCA data identified splicing factor QKI as a regulator of NIN exon 18 splicing. QKI directly bound NIN pre-mRNA and promoted exon 18 inclusion, generating an oncogenic exon 18-included NIN isoform. Depletion of this isoform suppressed breast cancer cell proliferation, migration, invasion, induced S-phase arrest via dysregulation of the CDK2/Cyclin A axis, and inhibited tumor growth in vivo.","method":"Multi-omics (TCGA analysis), RNA immunoprecipitation, splicing assays, siRNA knockdown, cell proliferation/invasion assays, xenograft tumor model, cell cycle analysis","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods including in vivo validation; single study","pmids":["41135748"],"is_preprint":false}],"current_model":"Ninein (NIN) is a large coiled-coil centrosomal protein that localizes to subdistal appendages of the mother centriole, where it acts as a molecular link between γ-tubulin ring complex (γ-TuRC) docking for microtubule nucleation and microtubule anchoring; its recruitment to the centrosome depends on PCM-1-containing centriolar satellites and dynactin, it is required for MTOC function and radial microtubule organization, it is recruited during daughter-to-mother centrosome maturation, and NIN mutations cause microcephalic primordial dwarfism and skeletal dysplasia in humans, while an oncogenic NIN isoform generated by QKI-dependent exon 18 splicing promotes breast cancer progression via the CDK2/Cyclin A axis."},"narrative":{"teleology":[{"year":1996,"claim":"Identification of ninein as a novel centrosomal protein established it as a coiled-coil, pericentriolar matrix component present throughout the cell cycle, answering the question of its subcellular home and structural architecture.","evidence":"cDNA cloning, immunofluorescence, and immunoelectron microscopy in human fibroblasts","pmids":["8834802"],"confidence":"High","gaps":["No functional role assigned","Binding partners unknown","Coiled-coil regions not mapped to specific activities"]},{"year":2002,"claim":"Two contemporaneous studies demonstrated that ninein is required for MTOC function and that its centrosomal targeting depends on PCM-1/centriolar satellites and dynactin, placing ninein in a defined centrosome assembly hierarchy and establishing its functional necessity for microtubule organization.","evidence":"Antibody microinjection into metaphase HeLa/PtK2 cells; siRNA knockdown of PCM-1 and ninein with microtubule organization assays","pmids":["11956314","12403812"],"confidence":"High","gaps":["Mechanism by which ninein anchors microtubules not resolved","No distinction between nucleation and anchoring roles","Direct binding to dynactin not shown"]},{"year":2005,"claim":"Domain dissection revealed that ninein's C-terminus targets subdistal appendages and its N-terminus recruits γ-TuRC, uncoupling microtubule nucleation from anchoring and establishing ninein as the molecular link between these two centrosomal activities.","evidence":"Expression of deletion constructs, γ-TuRC co-localization, and microtubule regrowth assays in cultured cells","pmids":["15784680"],"confidence":"High","gaps":["Direct biochemical interaction between ninein N-terminus and γ-TuRC subunits not mapped","How ninein achieves microtubule anchoring structurally remains unclear","Regulation of ninein targeting not addressed"]},{"year":2011,"claim":"Super-resolution microscopy resolved ninein into discrete density masses forming rings at subdistal appendages, revealing cell-cycle-dependent reorganization (reduction during mitosis) and providing the first nanoscale architectural view of ninein at the centrosome.","evidence":"3D-structured illumination microscopy of human centrosomes with cell cycle staging","pmids":["21399614","23213374"],"confidence":"High","gaps":["Molecular basis for mitotic reduction of ninein density not identified","Whether density masses correspond to oligomeric ninein complexes not tested","Relationship between structural reorganization and MTOC activity during cell cycle transitions not established"]},{"year":2013,"claim":"Genetic studies linked biallelic NIN mutations to human skeletal dysplasia and microcephalic primordial dwarfism, establishing ninein as a disease gene required for normal skeletal and brain development.","evidence":"Homozygosity mapping and whole-exome sequencing in a consanguineous family","pmids":["23665482"],"confidence":"Medium","gaps":["No biochemical characterization of mutant ninein protein","Mechanism linking centrosomal dysfunction to skeletal phenotype not defined","Limited to a single family without independent replication"]},{"year":2014,"claim":"Systematic proximity and affinity-based proteomics placed ninein within the centrosome-cilium protein interaction network alongside centriolar satellite and centriole duplication factors, expanding its interaction landscape beyond γ-TuRC and PCM-1.","evidence":"BioID proximity biotinylation and AP-MS in HEK293T cells","pmids":["24613305","26638075"],"confidence":"Medium","gaps":["Most interactions not validated by reciprocal or orthogonal approaches","Functional significance of individual proximity partners not tested","Direct versus indirect associations not distinguished"]},{"year":2025,"claim":"Identification of a QKI-regulated exon 18-included NIN splice isoform that drives breast cancer proliferation and invasion via CDK2/Cyclin A dysregulation revealed a previously unknown oncogenic function for a specific ninein isoform, extending NIN biology beyond centrosome structural roles.","evidence":"Multi-omics analysis of TCGA-BRCA, RNA immunoprecipitation, splicing assays, siRNA knockdown, xenograft model","pmids":["41135748"],"confidence":"Medium","gaps":["Mechanism by which exon 18-containing isoform activates CDK2/Cyclin A not defined","Whether this isoform retains centrosomal localization not tested","Findings from a single study awaiting independent replication"]},{"year":null,"claim":"Key unresolved questions include the structural basis of ninein's microtubule anchoring activity, the biochemical mechanism linking ninein to γ-TuRC subunits, how disease-causing mutations disrupt ninein function at the molecular level, and whether the oncogenic splice isoform acts through centrosome-dependent or -independent mechanisms.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of ninein or its domains","No reconstituted microtubule anchoring assay","Isoform-specific functions not systematically mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,1,3,5,6,12]}],"pathway":[],"complexes":[],"partners":["PCM1","PCNT","CEP110","CEP63","QKI"],"other_free_text":[]},"mechanistic_narrative":"Ninein is a large coiled-coil centrosomal protein that localizes to subdistal appendages of the mother centriole, where it functions as a molecular linker coupling γ-tubulin ring complex (γ-TuRC) docking for microtubule nucleation with microtubule anchoring, thereby serving as a critical determinant of MTOC activity and radial microtubule organization [PMID:15784680, PMID:11956314]. Its N-terminus binds γ-TuRC while its C-terminus mediates subdistal appendage targeting, and domain dissection demonstrates that nucleation and anchoring are separable functions [PMID:15784680]. Centrosomal recruitment of ninein depends on PCM-1-containing centriolar satellites and dynactin, positioning it downstream in a hierarchical centrosome assembly pathway [PMID:12403812]. Biallelic NIN mutations cause microcephalic primordial dwarfism and skeletal dysplasia in humans [PMID:23665482], and a QKI-regulated exon 18-included NIN splice isoform promotes breast cancer cell proliferation and invasion through the CDK2/Cyclin A axis [PMID:41135748]."},"prefetch_data":{"uniprot":{"accession":"Q8N4C6","full_name":"Ninein","aliases":["Glycogen synthase kinase 3 beta-interacting protein","GSK3B-interacting protein"],"length_aa":2090,"mass_kda":243.2,"function":"Centrosomal protein required in the positioning and anchorage of the microtubule minus-end in epithelial cells (PubMed:15190203, PubMed:23386061). May also act as a centrosome maturation factor (PubMed:11956314). May play a role in microtubule nucleation, by recruiting the gamma-tubulin ring complex to the centrosome (PubMed:15190203). Overexpression does not perturb nucleation or elongation of microtubules but suppresses release of microtubules (PubMed:15190203). Required for centriole organization and microtubule anchoring at the mother centriole (PubMed:23386061)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8N4C6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NIN","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CCT5","stoichiometry":0.2},{"gene":"CCT6A","stoichiometry":0.2},{"gene":"CLASP1","stoichiometry":0.2},{"gene":"CLASP2","stoichiometry":0.2},{"gene":"CLIP1","stoichiometry":0.2},{"gene":"TUBB4B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NIN","total_profiled":1310},"omim":[{"mim_id":"620397","title":"AURORA KINASE A- AND NINEIN-INTERACTING PROTEIN; AUNIP","url":"https://www.omim.org/entry/620397"},{"mim_id":"614851","title":"SECKEL SYNDROME 7; SCKL7","url":"https://www.omim.org/entry/614851"},{"mim_id":"614848","title":"CENTROSOMAL PROTEIN, 164-KD; CEP164","url":"https://www.omim.org/entry/614848"},{"mim_id":"611425","title":"CENTROBIN, CENTRIOLE DUPLICATION AND SPINDLE ASSEMBLY PROTEIN; CNTROB","url":"https://www.omim.org/entry/611425"},{"mim_id":"610858","title":"RNA TRANSCRIPTION, TRANSLATION, AND TRANSPORT FACTOR; RTRAF","url":"https://www.omim.org/entry/610858"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Basal body","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Nucleoli rim","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":38.9}],"url":"https://www.proteinatlas.org/search/NIN"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q8N4C6","domains":[{"cath_id":"1.10.238.10","chopping":"2-80","consensus_level":"medium","plddt":71.3751,"start":2,"end":80},{"cath_id":"1.10.238","chopping":"184-249","consensus_level":"medium","plddt":71.7952,"start":184,"end":249}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N4C6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N4C6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N4C6-F1-predicted_aligned_error_v6.png","plddt_mean":63.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NIN","jax_strain_url":"https://www.jax.org/strain/search?query=NIN"},"sequence":{"accession":"Q8N4C6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N4C6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N4C6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N4C6"}},"corpus_meta":[{"pmid":"23511481","id":"PMC_23511481","title":"Arabidopsis NIN-like transcription factors have a central role in nitrate signalling.","date":"2013","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/23511481","citation_count":312,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17369436","id":"PMC_17369436","title":"Medicago truncatula NIN is essential for rhizobial-independent nodule organogenesis induced by autoactive calcium/calmodulin-dependent protein kinase.","date":"2007","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/17369436","citation_count":306,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"36137053","id":"PMC_36137053","title":"NIN-like protein 7 transcription factor is a plant nitrate sensor.","date":"2022","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/36137053","citation_count":185,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15785851","id":"PMC_15785851","title":"Evolution of NIN-like proteins in Arabidopsis, rice, and Lotus japonicus.","date":"2005","source":"Journal of molecular evolution","url":"https://pubmed.ncbi.nlm.nih.gov/15785851","citation_count":165,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"29403008","id":"PMC_29403008","title":"A NIN-LIKE PROTEIN mediates nitrate-induced control of root nodule symbiosis in Lotus japonicus.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29403008","citation_count":143,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"27731416","id":"PMC_27731416","title":"NIN-like protein 8 is a master regulator of nitrate-promoted seed germination in Arabidopsis.","date":"2016","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/27731416","citation_count":143,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26672071","id":"PMC_26672071","title":"The NIN Transcription Factor Coordinates Diverse Nodulation Programs in Different Tissues of the Medicago truncatula Root.","date":"2015","source":"The Plant cell","url":"https://pubmed.ncbi.nlm.nih.gov/26672071","citation_count":134,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30297831","id":"PMC_30297831","title":"NIN interacts with NLPs to mediate nitrate inhibition of nodulation in Medicago truncatula.","date":"2018","source":"Nature plants","url":"https://pubmed.ncbi.nlm.nih.gov/30297831","citation_count":125,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12644653","id":"PMC_12644653","title":"The Sym35 gene required for root nodule development in pea is an ortholog of Nin from Lotus japonicus.","date":"2003","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/12644653","citation_count":115,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30610167","id":"PMC_30610167","title":"A Remote cis-Regulatory Region Is Required for NIN Expression in the Pericycle to Initiate Nodule Primordium Formation in Medicago truncatula.","date":"2019","source":"The Plant cell","url":"https://pubmed.ncbi.nlm.nih.gov/30610167","citation_count":102,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30710053","id":"PMC_30710053","title":"NIN Acts as a Network Hub Controlling a Growth Module Required for Rhizobial Infection.","date":"2019","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/30710053","citation_count":98,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34709882","id":"PMC_34709882","title":"NIN-like protein transcription factors regulate leghemoglobin genes in legume nodules.","date":"2021","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/34709882","citation_count":95,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"32576831","id":"PMC_32576831","title":"The NIN transcription factor coordinates CEP and CLE signaling peptides that regulate nodulation antagonistically.","date":"2020","source":"Nature 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(NOB1).","date":"2014","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/25010867","citation_count":65,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19519902","id":"PMC_19519902","title":"Fatty acid desaturation index correlates with body mass and adiposity indices of obesity in Wistar NIN obese mutant rat strains WNIN/Ob and WNIN/GR-Ob.","date":"2009","source":"Nutrition & metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/19519902","citation_count":58,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26096779","id":"PMC_26096779","title":"The Casuarina NIN gene is transcriptionally activated throughout Frankia root infection as well as in response to bacterial diffusible signals.","date":"2015","source":"The New phytologist","url":"https://pubmed.ncbi.nlm.nih.gov/26096779","citation_count":55,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25760058","id":"PMC_25760058","title":"MicroRNA-326 functions as a tumor suppressor in colorectal cancer by targeting the nin one binding protein.","date":"2015","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/25760058","citation_count":55,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"31793100","id":"PMC_31793100","title":"The NIN-like protein 5 (ZmNLP5) transcription factor is involved in modulating the nitrogen response in maize.","date":"2020","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/31793100","citation_count":54,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"32664480","id":"PMC_32664480","title":"Evolution of NIN and NIN-like Genes in Relation to Nodule Symbiosis.","date":"2020","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/32664480","citation_count":53,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35150141","id":"PMC_35150141","title":"Rice NIN-LIKE PROTEIN 3 modulates nitrogen use efficiency and grain yield under nitrate-sufficient 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/12403812","citation_count":410,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8889548","id":"PMC_8889548","title":"Normalization and subtraction: two approaches to facilitate gene discovery.","date":"1996","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/8889548","citation_count":401,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24255178","id":"PMC_24255178","title":"Protein interaction network of the mammalian Hippo pathway reveals mechanisms of kinase-phosphatase interactions.","date":"2013","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/24255178","citation_count":383,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15048123","id":"PMC_15048123","title":"Abi1 is essential for the formation and activation of a WAVE2 signalling complex.","date":"2004","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15048123","citation_count":341,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34079125","id":"PMC_34079125","title":"A proximity-dependent biotinylation map of a human cell.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/34079125","citation_count":339,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32838362","id":"PMC_32838362","title":"Virus-Host Interactome and Proteomic Survey Reveal Potential Virulence Factors Influencing SARS-CoV-2 Pathogenesis.","date":"2020","source":"Med (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/32838362","citation_count":291,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23213374","id":"PMC_23213374","title":"3D-structured illumination microscopy provides novel insight into architecture of human centrosomes.","date":"2012","source":"Biology open","url":"https://pubmed.ncbi.nlm.nih.gov/23213374","citation_count":268,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21399614","id":"PMC_21399614","title":"Novel asymmetrically localizing components of human centrosomes identified by complementary proteomics methods.","date":"2011","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/21399614","citation_count":265,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15784680","id":"PMC_15784680","title":"Microtubule nucleation and anchoring at the centrosome are independent processes linked by ninein function.","date":"2005","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/15784680","citation_count":228,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25281560","id":"PMC_25281560","title":"Proximity biotinylation and affinity purification are complementary approaches for the interactome mapping of chromatin-associated protein complexes.","date":"2014","source":"Journal of proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/25281560","citation_count":215,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24613305","id":"PMC_24613305","title":"Proximity interactions among centrosome components identify regulators of centriole duplication.","date":"2014","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/24613305","citation_count":162,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19322201","id":"PMC_19322201","title":"Ubiquitin-mediated proteolysis of HuR by heat shock.","date":"2009","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/19322201","citation_count":142,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8834802","id":"PMC_8834802","title":"Molecular characterisation of ninein, a new coiled-coil protein of the centrosome.","date":"1996","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/8834802","citation_count":130,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32989298","id":"PMC_32989298","title":"PROTAC-mediated degradation reveals a non-catalytic function of AURORA-A kinase.","date":"2020","source":"Nature chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/32989298","citation_count":129,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11956314","id":"PMC_11956314","title":"CEP110 and ninein are located in a specific domain of the centrosome associated with centrosome maturation.","date":"2002","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/11956314","citation_count":125,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47738,"output_tokens":1565,"usd":0.083345},"stage2":{"model":"claude-opus-4-6","input_tokens":4367,"output_tokens":1463,"usd":0.087615},"total_usd":0.497016,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":61176,"output_tokens":4772,"usd":0.127554},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6992,"output_tokens":3895,"usd":0.198502}},"stage1_raw":"Looking at the corpus, I need to identify which \"NIN\" gene is being queried. The corpus contains:\n1. Plant NIN/NLP genes (nodule inception, nitrate signaling) - many papers\n2. Human NIN (Ninein) - a centrosomal protein (PMID 15087377, 23665482, 22937743, 41135748, 40751525, 94)\n3. NOB1 (Nin One Binding protein) - a different protein, papers about glioma/cancer\n4. Lambda phage nin region - unrelated\n\nThe human NIN gene encodes Ninein, a centrosomal protein. Let me extract only mechanistic findings about human/mammalian Ninein (NIN).\n\nKey papers about mammalian NIN (Ninein):\n- PMID 15087377: NIN fused to PDGFRB in myeloproliferative disorder; NIN encodes a centrosomal protein with CEP110-like function\n- PMID 23665482: NIN mutation causes skeletal dysplasia; NIN shows functional relationship with KIF22 and proteins associated with chromosome congression, centrosomal function, and ciliogenesis\n- PMID 22937743: NIN necessary for maintaining asymmetric neurogenic divisions of radial glial cells (RGCs); positive selection during anthropoid evolution\n- PMID 41135748: QKI regulates NIN exon 18 splicing; exon 18-included NIN isoform promotes breast cancer cell proliferation/migration via CDK2/Cyclin A axis\n- PMID 40751525: Clinical report of NIN variants causing microcephalic primordial dwarfism\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"NIN (Ninein) was identified as a centrosomal protein with CEP110-like function; the NIN gene is fused to PDGFRB via a chromosomal translocation t(5;14)(q33;q24), producing a constitutively active NIN-PDGFRB fusion oncogene in a patient with imatinib-responsive myeloproliferative disorder with eosinophilia, consistent with the requirement for oligomerization domains in tyrosine kinase fusion proteins.\",\n      \"method\": \"FISH mapping of chromosomal breakpoints, RT-PCR confirmation of fusion transcript, imatinib treatment with hematological and cytogenetic remission as functional readout\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular identification of fusion gene with functional pharmacological validation (imatinib response), single study\",\n      \"pmids\": [\"15087377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NIN is necessary for maintaining asymmetric, neurogenic divisions of radial glial cells (RGCs) during cortical development; positive selection on NIN during anthropoid evolution was significantly associated with neonatal brain size and neuron number in catarrhines, implicating NIN in the radial dimension of cortical development and prenatal neurogenesis.\",\n      \"method\": \"Molecular evolutionary analysis (dN/dS), comparative neuroanatomical correlation of selection signatures with neural phenotypes across primate species\",\n      \"journal\": \"Genes, brain, and behavior\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — evolutionary/correlative analysis; no direct functional experiment on the protein mechanism\",\n      \"pmids\": [\"22937743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Homozygous missense mutations in NIN (encoding Ninein) cause a spondyloepimetaphyseal dysplasia with joint laxity (SEMDJL2)-like skeletal phenotype; Ninein shows a functional relationship with KIF22 and other proteins involved in chromosome congression/movement, centrosomal function, and ciliogenesis, supporting a fundamental role in skeletal development.\",\n      \"method\": \"Homozygosity mapping, whole-exome sequencing, cosegregation analysis, in silico functional domain analysis, phenotypic characterization of patient cohort\",\n      \"journal\": \"Matrix biology : journal of the International Society for Matrix Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human genetics with multiple orthogonal genomic methods linking NIN mutation to disease phenotype, though no direct biochemical reconstitution\",\n      \"pmids\": [\"23665482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The splicing factor QKI directly binds NIN pre-mRNA and promotes inclusion of exon 18, generating an oncogenic exon-18-included NIN isoform; depletion of this isoform suppresses proliferation, migration, and invasion of breast cancer cells, induces S-phase arrest by dysregulating the CDK2/Cyclin A axis, and inhibits tumor growth in vivo.\",\n      \"method\": \"Multi-omics analysis (TCGA-BRCA), RNA splicing assays, loss-of-function experiments (isoform-specific depletion), cell cycle analysis (flow cytometry), CDK2/Cyclin A western blotting, xenograft tumor model\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (molecular, cellular, in vivo) in single study establishing QKI→NIN exon 18 inclusion→CDK2/Cyclin A→cell cycle axis\",\n      \"pmids\": [\"41135748\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human NIN (Ninein) encodes a centrosomal protein with CEP110-like function required for maintaining asymmetric neurogenic divisions of radial glial cells; it can be fused to PDGFRB as an oncogenic fusion kinase, loss-of-function mutations cause microcephalic primordial dwarfism and skeletal dysplasias linked to defective centrosomal/ciliogenic function, and an alternatively spliced exon-18-included isoform (generated by QKI-mediated splicing) promotes breast cancer cell proliferation via dysregulation of the CDK2/Cyclin A axis.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nThe target gene is **NIN** (Ninein) — the human/mammalian centrosomal protein gene (HGNC:7665), involved in microtubule anchoring at the centrosome.\n\n**Papers about plant NIN/NLP (Nodule Inception / NIN-Like Proteins):** Papers [1]-[15] (corpus), [17]-[18], [21]-[32], [34], [37], [40]-[43] (corpus numbered), [52-53], [55-56], [58-59], [61-63], [66-68], [73], [76-78], [81], [83], [86-87], [89-93], [96-97], [98], [100] → **EXCLUDE** (alias collision — plant NIN/NLP genes)\n\n**Papers about NOB1 (NIN One Binding protein):** [16], [19], [22], [38], [43], [47], [71], [72] → **EXCLUDE** (alias collision — NOB1/NIN1-binding protein, not NIN/Ninein)\n\n**Papers about bacteriophage lambda nin region:** [54] → **EXCLUDE** (alias collision)\n\n**Papers about Nin-formylation chemistry:** [35], [49] → **EXCLUDE** (Nin = N-in-ring formylation of tryptophan, not the protein)\n\n**Papers about WNIN rat strains / Chinese herbal medicine / rice variety Jao Hom Nin / other non-NIN subjects:** [20], [36], [39], [51], [69], [74], [75], [95] → **EXCLUDE**\n\n**Papers about NiN (nickel-nitrogen) chemistry, materials science:** [64], [65], [80], [82], [84], [85] → **EXCLUDE**\n\n**Papers about E. coli ArgO (Nin-Cout topology):** [70] → **EXCLUDE**\n\n**Papers about transmembrane helix topology (Nin orientation):** [45] → **EXCLUDE**\n\n**Papers about NIN positive selection in primates:** [50] → **KEEP** (describes human NIN gene function in neurogenesis)\n\n**Paper about NIN mutation in skeletal dysplasia:** [48] → **KEEP** (describes human NIN/Ninein gene)\n\n**Paper about QKI-mediated NIN exon 18 splicing in breast cancer:** [88] → **KEEP** (human NIN gene)\n\n**Paper about NIN clinical phenotype expansion:** [94] → **KEEP** (human NIN gene)\n\n**Paper about NIN-PDGFRB fusion:** [26] → **KEEP** (describes human NIN centrosomal protein gene)\n\n**Gene2pubmed curated papers:**\n\n- [1] SARS-CoV-2 interactome → mentions NIN as interaction partner → **KEEP** (NIN listed as human protein)\n- [2] MGC cDNA project → **KEEP** (NIN cDNA sequenced)\n- [3] DUB interaction landscape → may include NIN → need to check; large proteomics study, NIN likely incidental → **KEEP** only if NIN-specific finding; treat as background\n- [4] BioPlex network → includes NIN interactions → **KEEP**\n- [5] BioPlex 2.0 → **KEEP**\n- [6] Human interactome quantitative → **KEEP**\n- [7] VIRMA/m6A → NIN unlikely relevant → **EXCLUDE** (no NIN mechanistic content)\n- [8] FLJ cDNAs → **KEEP** (NIN sequenced)\n- [9] BioPlex 3.0 → **KEEP**\n- [10] GO propagation → **EXCLUDE** (no NIN-specific finding)\n- [11] mRNA granules BioID → may include NIN → **KEEP** if NIN-specific\n- [12] Comparative coronavirus interactome → **KEEP** if NIN interaction found\n- [13] MGC project → **KEEP**\n- [14] Centrosome-cilium BioID → **KEEP** (NIN is centrosomal)\n- [15] OpenCell → **KEEP** (NIN localization)\n- [16] PCM-1 assembly → **KEEP** (mentions ninein directly)\n- [17] Normalization/subtraction cDNA → **EXCLUDE** (no NIN-specific finding)\n- [18] Hippo pathway interactome → **EXCLUDE** (no NIN content)\n- [19] WAVE2/Abi1 → **EXCLUDE** (no NIN content)\n- [20] BioID human cell map → **KEEP** (NIN localization)\n- [21] SARS-CoV-2 virulence → **EXCLUDE** (no NIN-specific finding)\n- [22] 3D-SIM centrosome → **KEEP** (ninein analyzed)\n- [23] Novel centrosomal proteins → **KEEP** (ninein characterized)\n- [24] Microtubule nucleation and anchoring, ninein → **KEEP** (core ninein paper)\n- [25] BioID vs AP-MS → **EXCLUDE** (no NIN-specific finding)\n- [26] Centriole duplication BioID → **KEEP** (NIN proximity interactions)\n- [27] HuR ubiquitination → **EXCLUDE** (no NIN content)\n- [28] Ninein molecular characterization → **KEEP** (foundational NIN paper)\n- [29] AURORA-A PROTAC → **EXCLUDE** (no NIN content)\n- [30] CEP110 and ninein centrosome domain → **KEEP** (core ninein paper)\n\nNow extracting discoveries from KEPT papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"Ninein (NIN) was identified as a novel centrosomal protein with a predicted molecular weight of ~245–249 kDa, containing extensive coiled-coil domains, an EF-hand-like domain, a potential GTP-binding site, and four leucine zipper domains. Immunofluorescence and immunoelectron microscopy localized ninein specifically to the pericentriolar matrix throughout the cell cycle, with additional nuclear localization observed at interphase in fibroblasts and association with the mitotic spindle during mitosis.\",\n      \"method\": \"cDNA cloning, immunofluorescence, immunoelectron microscopy, domain analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original molecular characterization with multiple orthogonal methods (cloning, IF, IEM); foundational paper with >130 citations\",\n      \"pmids\": [\"8834802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CEP110 and ninein co-localize in a specific domain of the centrosome corresponding to the open end of the centrosome tube, the site of daughter-to-mother centrosome maturation. Microinjection of antibodies against ninein into metaphase cells disrupted reformation of the centrosome tubular architecture following cell division and abolished centrosome function as a microtubule-organizing center (MTOC), demonstrating ninein is required for MTOC function and centrosome maturation.\",\n      \"method\": \"Immunofluorescence, co-localization mapping, antibody microinjection into metaphase HeLa and PtK2 cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct functional loss-of-function by antibody microinjection with clear MTOC phenotype; replicated across two cell types\",\n      \"pmids\": [\"11956314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PCM-1 depletion by siRNA or antibody microinjection reduced the targeting of ninein (as well as centrin and pericentrin) to the centrosome, indicating that PCM-1-containing centriolar satellites are required for the dynactin-dependent recruitment of ninein to the centrosome. Furthermore, ninein depletion itself disrupted radial microtubule organization without affecting nucleation, placing ninein downstream of PCM-1 in the centrosomal recruitment pathway.\",\n      \"method\": \"siRNA knockdown, antibody microinjection, immunofluorescence, microtubule organization assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal loss-of-function experiments with clear pathway placement; >400 citations\",\n      \"pmids\": [\"12403812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ninein localizes to subdistal appendages of the mother centriole via its C-terminus and interacts with γ-tubulin ring complexes (γ-TuRC) via its N-terminus. Expression of a C-terminal ninein fragment displaced endogenous ninein and γ-TuRC from the centrosome, causing both microtubule nucleation and anchoring defects. A construct lacking the central coiled-coil domain (but containing both termini) displaced ninein without affecting γ-TuRC localization, producing anchoring defects only, thereby uncoupling nucleation from anchoring. This demonstrated that ninein acts as a molecular link between γ-TuRC docking (nucleation) and microtubule anchoring at subdistal appendages.\",\n      \"method\": \"Domain deletion/expression constructs, immunofluorescence, microtubule regrowth assay, γ-TuRC co-localization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — domain dissection with multiple constructs distinguishing two separable activities; >228 citations\",\n      \"pmids\": [\"15784680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NIN was identified as the gene fused to PDGFRB in a t(5;14)(q33;q24) translocation associated with a chronic myeloproliferative disorder with eosinophilia. NIN encodes a centrosomal protein with CEP110-like function, and the NIN-PDGFRB fusion protein was detected by RT-PCR. The patient achieved hematological and cytogenetic remission with imatinib, confirming the fusion's role in disease.\",\n      \"method\": \"FISH, RT-PCR, candidate gene sequencing, clinical imatinib treatment response\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct identification of fusion gene by molecular methods; single case report\",\n      \"pmids\": [\"15087377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Super-resolution 3D-structured illumination microscopy (3D-SIM) analysis of human centrosomes revealed that ninein localizes to appendage structures of the mother centriole, forming rings with multiple density masses at the subdistal appendages. The number of these density masses was strongly reduced during mitosis, indicating cell cycle-dependent reorganization of ninein at centrosomal appendages.\",\n      \"method\": \"3D-structured illumination microscopy (3D-SIM), site-specific antibodies, cell cycle staging\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — super-resolution structural analysis with quantitative assessment of cell cycle dynamics; >265 citations\",\n      \"pmids\": [\"21399614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"3D-SIM analysis of 18 centriole and PCM components confirmed that ninein localizes to subdistal appendage structures at specific radial distances from centriole walls, forming ring patterns with discernible density masses during interphase, consistent with its role at mother centriole appendages.\",\n      \"method\": \"3D-structured illumination microscopy, comparative localization of 18 centrosomal components\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — super-resolution structural mapping with comprehensive multi-protein comparison; >268 citations\",\n      \"pmids\": [\"23213374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Positive selection analysis revealed that NIN evolved adaptively during anthropoid primate evolution. NIN is functionally required for maintaining asymmetric neurogenic divisions of radial glial cells (RGCs). Selection on NIN was significantly associated with neonatal brain size in catarrhines and potentially with variation in neuron number, suggesting NIN's role in RGC neurogenic divisions contributed to primate brain evolution.\",\n      \"method\": \"Molecular evolution analysis (dN/dS), comparative phenotypic association analysis across primate lineages\",\n      \"journal\": \"Genes, brain, and behavior\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — evolutionary/computational analysis; functional role in RGC divisions cited from prior work, not directly demonstrated in this paper\",\n      \"pmids\": [\"22937743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Homozygosity mapping and whole-exome sequencing in a consanguineous family with a SEMDJL2-like skeletal dysplasia phenotype identified homozygous missense mutations in NIN (Ninein). Evidence is presented that mutant Ninein is causative, based on its functional relationship with KIF22 and other centrosome-associated proteins linked to chromosome congression and ciliogenesis, and on the prior identification of compound heterozygous NIN mutations in microcephalic primordial dwarfism, supporting a fundamental role of Ninein in skeletal development.\",\n      \"method\": \"Homozygosity mapping, whole-exome sequencing, segregation analysis, functional relationship analysis\",\n      \"journal\": \"Matrix biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic identification with functional inference; no direct biochemical validation of the mutant protein in this study\",\n      \"pmids\": [\"23665482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BioID proximity-dependent biotinylation of centriole duplication proteins identified ninein within the centrosome proximity interaction network, associating it with centriolar satellite components and centriole duplication regulators including CEP63, placing NIN in the centrosome protein interaction landscape.\",\n      \"method\": \"BioID (proximity-dependent biotin identification), mass spectrometry\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — proximity biotinylation identifies interaction landscape but does not establish direct physical binding\",\n      \"pmids\": [\"24613305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"High-throughput AP-MS (BioPlex network) identified protein-protein interaction partners for ninein in HEK293T cells as part of a proteome-scale interaction map, placing NIN within protein communities related to centrosome function.\",\n      \"method\": \"Affinity purification-mass spectrometry (AP-MS), network analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — large-scale AP-MS; NIN interactions identified as part of proteome-wide screen without specific validation\",\n      \"pmids\": [\"26186194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BioID mapping of the centrosome-cilium interface using 58 bait proteins generated a protein topology network that included ninein, placing it within the centrosome-cilium interaction landscape and linking it to processes including ciliogenesis and centriolar satellite biogenesis.\",\n      \"method\": \"BioID (proximity-dependent biotinylation), mass spectrometry, high-resolution phenotypic profiling\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — systematic proximity interaction mapping of centrosome with functional validation of hits; NIN specifically placed in centrosome-cilium network\",\n      \"pmids\": [\"26638075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OpenCell endogenous tagging and live-cell imaging confirmed ninein localization to the centrosome in human cells under near-endogenous expression conditions, providing high-confidence subcellular localization data as part of a systematic proteome cartography effort.\",\n      \"method\": \"CRISPR endogenous tagging, confocal live-cell imaging, AP-MS\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous-level expression with direct imaging; part of large systematic study\",\n      \"pmids\": [\"35271311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Multi-omics analysis of TCGA-BRCA data identified splicing factor QKI as a regulator of NIN exon 18 splicing. QKI directly bound NIN pre-mRNA and promoted exon 18 inclusion, generating an oncogenic exon 18-included NIN isoform. Depletion of this isoform suppressed breast cancer cell proliferation, migration, invasion, induced S-phase arrest via dysregulation of the CDK2/Cyclin A axis, and inhibited tumor growth in vivo.\",\n      \"method\": \"Multi-omics (TCGA analysis), RNA immunoprecipitation, splicing assays, siRNA knockdown, cell proliferation/invasion assays, xenograft tumor model, cell cycle analysis\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including in vivo validation; single study\",\n      \"pmids\": [\"41135748\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Ninein (NIN) is a large coiled-coil centrosomal protein that localizes to subdistal appendages of the mother centriole, where it acts as a molecular link between γ-tubulin ring complex (γ-TuRC) docking for microtubule nucleation and microtubule anchoring; its recruitment to the centrosome depends on PCM-1-containing centriolar satellites and dynactin, it is required for MTOC function and radial microtubule organization, it is recruited during daughter-to-mother centrosome maturation, and NIN mutations cause microcephalic primordial dwarfism and skeletal dysplasia in humans, while an oncogenic NIN isoform generated by QKI-dependent exon 18 splicing promotes breast cancer progression via the CDK2/Cyclin A axis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NIN encodes Ninein, a centrosomal protein that functions in microtubule organization, ciliogenesis, and cell division, with roles in skeletal development and cortical neurogenesis. Homozygous missense mutations in NIN cause spondyloepimetaphyseal dysplasia with joint laxity, linking its centrosomal and ciliogenic functions to cartilage and bone formation [PMID:23665482]. The NIN locus participates in oncogenic rearrangements, generating a constitutively active NIN-PDGFRB fusion tyrosine kinase that drives myeloproliferative disease responsive to imatinib [PMID:15087377]. An alternatively spliced exon-18-included NIN isoform, generated by QKI-mediated splicing, promotes breast cancer cell proliferation, migration, and invasion through dysregulation of the CDK2/Cyclin A cell-cycle axis [PMID:41135748].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that NIN encodes a centrosomal protein capable of forming oncogenic fusions answered the question of how NIN contributes to neoplasia: its oligomerization domains constitutively activate PDGFRB kinase when fused by translocation.\",\n      \"evidence\": \"FISH breakpoint mapping, RT-PCR of fusion transcript, and imatinib pharmacological response in a patient with myeloproliferative disorder\",\n      \"pmids\": [\"15087377\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The oncogenic mechanism was inferred from a single patient; frequency of NIN-PDGFRB fusions is unknown\",\n        \"Which NIN domains are required for oligomerization-dependent kinase activation was not mapped\",\n        \"No biochemical reconstitution of the fusion kinase activity\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Correlating positive selection on NIN with neonatal brain size in primates suggested that Ninein's centrosomal role is important for radial glial cell divisions during cortical neurogenesis, but this remained indirect.\",\n      \"evidence\": \"Molecular evolutionary analysis (dN/dS) with comparative neuroanatomical phenotype correlation across primate species\",\n      \"pmids\": [\"22937743\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct functional experiment (knockdown, knockout, or rescue) was performed to test NIN's role in neurogenesis\",\n        \"Association between selection signatures and brain size does not establish causation\",\n        \"The specific molecular mechanism by which NIN influences asymmetric radial glial division is unknown\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying homozygous NIN mutations as the cause of a skeletal dysplasia established that Ninein's centrosomal and ciliogenic functions are essential for cartilage and bone development in humans.\",\n      \"evidence\": \"Homozygosity mapping, whole-exome sequencing, and cosegregation analysis in families with SEMDJL2-like phenotype\",\n      \"pmids\": [\"23665482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No cell biological or biochemical assays demonstrated how the identified missense mutations disrupt Ninein function\",\n        \"The relationship between Ninein and KIF22/ciliogenesis machinery was inferred but not experimentally validated\",\n        \"Whether the skeletal phenotype reflects primarily a centrosomal or a ciliogenic defect is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that QKI promotes inclusion of NIN exon 18 to generate a pro-proliferative isoform that activates the CDK2/Cyclin A axis revealed a splicing-dependent oncogenic mechanism for NIN in breast cancer.\",\n      \"evidence\": \"RNA splicing assays, isoform-specific depletion, flow cytometry cell cycle analysis, CDK2/Cyclin A immunoblotting, and xenograft tumor models in breast cancer cells\",\n      \"pmids\": [\"41135748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The direct protein target or binding partner of the exon-18-included isoform that links it to CDK2/Cyclin A regulation is not identified\",\n        \"Whether exon-18 inclusion alters Ninein's centrosomal localization or microtubule-anchoring function was not tested\",\n        \"Validation in non-breast cancer contexts is lacking\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which Ninein anchors microtubules at the centrosome and how disease-associated mutations or alternative splicing alter this core activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of Ninein or its centrosomal interaction interfaces exists in the timeline literature\",\n        \"The relationship between centrosomal microtubule anchoring, ciliogenesis, and skeletal/neuronal phenotypes has not been mechanistically dissected\",\n        \"Whether NIN isoforms have distinct subcellular localizations or interaction partners is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PDGFRB\",\n      \"QKI\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Ninein is a large coiled-coil centrosomal protein that localizes to subdistal appendages of the mother centriole, where it functions as a molecular linker coupling γ-tubulin ring complex (γ-TuRC) docking for microtubule nucleation with microtubule anchoring, thereby serving as a critical determinant of MTOC activity and radial microtubule organization [PMID:15784680, PMID:11956314]. Its N-terminus binds γ-TuRC while its C-terminus mediates subdistal appendage targeting, and domain dissection demonstrates that nucleation and anchoring are separable functions [PMID:15784680]. Centrosomal recruitment of ninein depends on PCM-1-containing centriolar satellites and dynactin, positioning it downstream in a hierarchical centrosome assembly pathway [PMID:12403812]. Biallelic NIN mutations cause microcephalic primordial dwarfism and skeletal dysplasia in humans [PMID:23665482], and a QKI-regulated exon 18-included NIN splice isoform promotes breast cancer cell proliferation and invasion through the CDK2/Cyclin A axis [PMID:41135748].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Identification of ninein as a novel centrosomal protein established it as a coiled-coil, pericentriolar matrix component present throughout the cell cycle, answering the question of its subcellular home and structural architecture.\",\n      \"evidence\": \"cDNA cloning, immunofluorescence, and immunoelectron microscopy in human fibroblasts\",\n      \"pmids\": [\"8834802\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional role assigned\", \"Binding partners unknown\", \"Coiled-coil regions not mapped to specific activities\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Two contemporaneous studies demonstrated that ninein is required for MTOC function and that its centrosomal targeting depends on PCM-1/centriolar satellites and dynactin, placing ninein in a defined centrosome assembly hierarchy and establishing its functional necessity for microtubule organization.\",\n      \"evidence\": \"Antibody microinjection into metaphase HeLa/PtK2 cells; siRNA knockdown of PCM-1 and ninein with microtubule organization assays\",\n      \"pmids\": [\"11956314\", \"12403812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ninein anchors microtubules not resolved\", \"No distinction between nucleation and anchoring roles\", \"Direct binding to dynactin not shown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Domain dissection revealed that ninein's C-terminus targets subdistal appendages and its N-terminus recruits γ-TuRC, uncoupling microtubule nucleation from anchoring and establishing ninein as the molecular link between these two centrosomal activities.\",\n      \"evidence\": \"Expression of deletion constructs, γ-TuRC co-localization, and microtubule regrowth assays in cultured cells\",\n      \"pmids\": [\"15784680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical interaction between ninein N-terminus and γ-TuRC subunits not mapped\", \"How ninein achieves microtubule anchoring structurally remains unclear\", \"Regulation of ninein targeting not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Super-resolution microscopy resolved ninein into discrete density masses forming rings at subdistal appendages, revealing cell-cycle-dependent reorganization (reduction during mitosis) and providing the first nanoscale architectural view of ninein at the centrosome.\",\n      \"evidence\": \"3D-structured illumination microscopy of human centrosomes with cell cycle staging\",\n      \"pmids\": [\"21399614\", \"23213374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for mitotic reduction of ninein density not identified\", \"Whether density masses correspond to oligomeric ninein complexes not tested\", \"Relationship between structural reorganization and MTOC activity during cell cycle transitions not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genetic studies linked biallelic NIN mutations to human skeletal dysplasia and microcephalic primordial dwarfism, establishing ninein as a disease gene required for normal skeletal and brain development.\",\n      \"evidence\": \"Homozygosity mapping and whole-exome sequencing in a consanguineous family\",\n      \"pmids\": [\"23665482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical characterization of mutant ninein protein\", \"Mechanism linking centrosomal dysfunction to skeletal phenotype not defined\", \"Limited to a single family without independent replication\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Systematic proximity and affinity-based proteomics placed ninein within the centrosome-cilium protein interaction network alongside centriolar satellite and centriole duplication factors, expanding its interaction landscape beyond γ-TuRC and PCM-1.\",\n      \"evidence\": \"BioID proximity biotinylation and AP-MS in HEK293T cells\",\n      \"pmids\": [\"24613305\", \"26638075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most interactions not validated by reciprocal or orthogonal approaches\", \"Functional significance of individual proximity partners not tested\", \"Direct versus indirect associations not distinguished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of a QKI-regulated exon 18-included NIN splice isoform that drives breast cancer proliferation and invasion via CDK2/Cyclin A dysregulation revealed a previously unknown oncogenic function for a specific ninein isoform, extending NIN biology beyond centrosome structural roles.\",\n      \"evidence\": \"Multi-omics analysis of TCGA-BRCA, RNA immunoprecipitation, splicing assays, siRNA knockdown, xenograft model\",\n      \"pmids\": [\"41135748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which exon 18-containing isoform activates CDK2/Cyclin A not defined\", \"Whether this isoform retains centrosomal localization not tested\", \"Findings from a single study awaiting independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of ninein's microtubule anchoring activity, the biochemical mechanism linking ninein to γ-TuRC subunits, how disease-causing mutations disrupt ninein function at the molecular level, and whether the oncogenic splice isoform acts through centrosome-dependent or -independent mechanisms.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of ninein or its domains\", \"No reconstituted microtubule anchoring assay\", \"Isoform-specific functions not systematically mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1, 3, 5, 6, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PCM1\", \"PCNT\", \"CEP110\", \"CEP63\", \"QKI\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway entries - they should use Reactome IDs, not GO terms. Let me correct this:\n\n```json\n{\n  \"mechanistic_narrative\": \"Ninein is a large coiled-coil centrosomal protein that localizes to subdistal appendages of the mother centriole, where it functions as a molecular linker coupling γ-tubulin ring complex (γ-TuRC) docking for microtubule nucleation with microtubule anchoring, thereby serving as a critical determinant of MTOC activity and radial microtubule organization [PMID:15784680, PMID:11956314]. Its N-terminus binds γ-TuRC while its C-terminus mediates subdistal appendage targeting, and domain dissection demonstrates that nucleation and anchoring are separable functions [PMID:15784680]. Centrosomal recruitment of ninein depends on PCM-1-containing centriolar satellites and dynactin, positioning it downstream in a hierarchical centrosome assembly pathway [PMID:12403812]. Biallelic NIN mutations cause microcephalic primordial dwarfism and skeletal dysplasia in humans [PMID:23665482], and a QKI-regulated exon 18-included NIN splice isoform promotes breast cancer cell proliferation and invasion through the CDK2/Cyclin A axis [PMID:41135748].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Identification of ninein as a novel centrosomal protein established it as a coiled-coil, pericentriolar matrix component present throughout the cell cycle, answering the question of its subcellular home and structural architecture.\",\n      \"evidence\": \"cDNA cloning, immunofluorescence, and immunoelectron microscopy in human fibroblasts\",\n      \"pmids\": [\"8834802\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional role assigned\", \"Binding partners unknown\", \"Coiled-coil regions not mapped to specific activities\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Two contemporaneous studies demonstrated that ninein is required for MTOC function and that its centrosomal targeting depends on PCM-1/centriolar satellites and dynactin, placing ninein in a defined centrosome assembly hierarchy and establishing its functional necessity for microtubule organization.\",\n      \"evidence\": \"Antibody microinjection into metaphase HeLa/PtK2 cells; siRNA knockdown of PCM-1 and ninein with microtubule organization assays\",\n      \"pmids\": [\"11956314\", \"12403812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ninein anchors microtubules not resolved\", \"No distinction between nucleation and anchoring roles\", \"Direct binding to dynactin not shown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Domain dissection revealed that ninein's C-terminus targets subdistal appendages and its N-terminus recruits γ-TuRC, uncoupling microtubule nucleation from anchoring and establishing ninein as the molecular link between these two centrosomal activities.\",\n      \"evidence\": \"Expression of deletion constructs, γ-TuRC co-localization, and microtubule regrowth assays in cultured cells\",\n      \"pmids\": [\"15784680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical interaction between ninein N-terminus and γ-TuRC subunits not mapped\", \"How ninein achieves microtubule anchoring structurally remains unclear\", \"Regulation of ninein targeting not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Super-resolution microscopy resolved ninein into discrete density masses forming rings at subdistal appendages, revealing cell-cycle-dependent reorganization (reduction during mitosis) and providing the first nanoscale architectural view of ninein at the centrosome.\",\n      \"evidence\": \"3D-structured illumination microscopy of human centrosomes with cell cycle staging\",\n      \"pmids\": [\"21399614\", \"23213374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for mitotic reduction of ninein density not identified\", \"Whether density masses correspond to oligomeric ninein complexes not tested\", \"Relationship between structural reorganization and MTOC activity during cell cycle transitions not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genetic studies linked biallelic NIN mutations to human skeletal dysplasia and microcephalic primordial dwarfism, establishing ninein as a disease gene required for normal skeletal and brain development.\",\n      \"evidence\": \"Homozygosity mapping and whole-exome sequencing in a consanguineous family\",\n      \"pmids\": [\"23665482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical characterization of mutant ninein protein\", \"Mechanism linking centrosomal dysfunction to skeletal phenotype not defined\", \"Limited to a single family without independent replication\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Systematic proximity and affinity-based proteomics placed ninein within the centrosome-cilium protein interaction network alongside centriolar satellite and centriole duplication factors, expanding its interaction landscape beyond γ-TuRC and PCM-1.\",\n      \"evidence\": \"BioID proximity biotinylation and AP-MS in HEK293T cells\",\n      \"pmids\": [\"24613305\", \"26638075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most interactions not validated by reciprocal or orthogonal approaches\", \"Functional significance of individual proximity partners not tested\", \"Direct versus indirect associations not distinguished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of a QKI-regulated exon 18-included NIN splice isoform that drives breast cancer proliferation and invasion via CDK2/Cyclin A dysregulation revealed a previously unknown oncogenic function for a specific ninein isoform, extending NIN biology beyond centrosome structural roles.\",\n      \"evidence\": \"Multi-omics analysis of TCGA-BRCA, RNA immunoprecipitation, splicing assays, siRNA knockdown, xenograft model\",\n      \"pmids\": [\"41135748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which exon 18-containing isoform activates CDK2/Cyclin A not defined\", \"Whether this isoform retains centrosomal localization not tested\", \"Findings from a single study awaiting independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of ninein's microtubule anchoring activity, the biochemical mechanism linking ninein to γ-TuRC subunits, how disease-causing mutations disrupt ninein function at the molecular level, and whether the oncogenic splice isoform acts through centrosome-dependent or -independent mechanisms.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of ninein or its domains\", \"No reconstituted microtubule anchoring assay\", \"Isoform-specific functions not systematically mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1, 3, 5, 6, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 3, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PCM1\", \"PCNT\", \"CEP110\", \"CEP63\", \"QKI\"],\n    \"other_free_text\": []\n  }\n}\n```"}