{"gene":"CNTROB","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2005,"finding":"Centrobin (CNTROB) was identified as a centriole-associated protein that asymmetrically localizes to the daughter centriole. siRNA-mediated silencing of centrobin inhibited centriole duplication, resulting in centrosomes with one or no centriole, and impaired cytokinesis, demonstrating that centrobin is required for centriole duplication.","method":"siRNA knockdown, immunofluorescence microscopy, cell cycle analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal localization and loss-of-function with defined cellular phenotype; foundational paper with >100 citations replicated across multiple studies","pmids":["16275750"],"is_preprint":false},{"year":2007,"finding":"Centrobin (NIP2/centrobin) was identified as a novel substrate of the mitotic kinase Nek2. Centrobin localizes to the daughter centriole and associates with stable cytoplasmic microtubules. Phosphorylation by Nek2 disperses centrobin aggregates and promotes its association with microtubules. Knockdown of centrobin caused reduced microtubule organizing activity, cell shrinkage, defective spindle assembly, and abnormal nuclear morphology, indicating a role in microtubule stabilization.","method":"Co-immunoprecipitation, kinase assay, siRNA knockdown, immunofluorescence microscopy","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — kinase-substrate relationship established by in vitro assay and Co-IP, loss-of-function phenotype with multiple orthogonal readouts","pmids":["17535851"],"is_preprint":false},{"year":2009,"finding":"In rats, an endogenous retroviral insertion into intron 10 of Cntrob disrupts normal splicing and produces a truncated centrobin protein. During spermiogenesis, centrobin localizes to the manchette, centrosome, and marginal ring of the acroplaxome, where it interacts with keratin 5-containing intermediate filaments. Loss of centrobin function causes defective acroplaxome marginal ring assembly and detachment of the centrosome from the nucleus, disrupting the head-tail coupling apparatus and causing spermatid decapitation, leading to male infertility.","method":"Genetic mapping, RT-PCR, immunofluorescence, co-immunoprecipitation, electron microscopy in rat hd mutant","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic loss-of-function with multiple orthogonal methods (localization, interaction, ultrastructure) showing defined mechanistic pathway","pmids":["19710508"],"is_preprint":false},{"year":2011,"finding":"Centrobin directly interacts with tubulin, and this interaction is required for centriole elongation and stability. Centrobin is recruited to the centriole biogenesis site via tubulin interaction in an hSAS-6-dependent but CPAP/CP110-independent manner. Disruption of the centrobin-tubulin interaction destabilized existing centrioles and CPAP-induced procentriole-like structures.","method":"In vitro binding assay (direct interaction), mutagenesis, siRNA knockdown, immunofluorescence, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro reconstitution of centrobin-tubulin interaction combined with mutagenesis and cellular loss-of-function phenotyping","pmids":["21576394"],"is_preprint":false},{"year":2018,"finding":"Genome editing (CRISPR) of CNTROB in hTERT-RPE1 cells showed that centrobin primarily localizes to daughter centrioles but also associates with mother centrioles upon serum starvation. Centrobin loss abrogated primary ciliation; ultrastructural analysis revealed defective axonemal extension after mother centriole docking. A C-terminal portion of centrobin that interacts with CP110 and tubulin is required for ciliogenesis. Depletion of centrobin in zebrafish caused microcephaly, body curvature, and laterality defects consistent with ciliary dysfunction, identifying centrobin as a positive regulator of vertebrate ciliogenesis.","method":"CRISPR knockout, monoclonal antibody localization, electron microscopy, Co-immunoprecipitation, zebrafish morpholino knockdown","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 — CRISPR loss-of-function with ultrastructural analysis, interaction mapping, and in vivo vertebrate model, multiple orthogonal methods","pmids":["29440264"],"is_preprint":false}],"current_model":"Centrobin (CNTROB) is a daughter centriole-localized protein that is required for centriole duplication, elongation, and stability through direct interaction with tubulin (in an hSAS-6-dependent manner); it is phosphorylated by Nek2, which mobilizes it to microtubules to promote stabilization; during spermiogenesis it localizes to the manchette and acroplaxome marginal ring where it interacts with keratin 5 intermediate filaments to maintain the head-tail coupling apparatus; and its C-terminal domain, which binds CP110 and tubulin, is required for axonemal extension during primary ciliogenesis, making centrobin a positive regulator of vertebrate cilia formation."},"narrative":{"teleology":[{"year":2005,"claim":"Identification of centrobin as the first marker of the daughter centriole and demonstration that it is required for centriole duplication resolved the question of whether centriole biogenesis depends on a centriole-intrinsic asymmetric factor.","evidence":"siRNA knockdown and immunofluorescence in cultured human cells","pmids":["16275750"],"confidence":"High","gaps":["Mechanism by which centrobin promotes duplication was unknown","Direct molecular binding partners were not identified","Whether centrobin functions beyond centriole duplication was untested"]},{"year":2007,"claim":"Establishing Nek2 as a kinase that phosphorylates centrobin and regulates its redistribution to microtubules showed how centrobin activity is controlled during the cell cycle and linked it to microtubule stabilization and spindle assembly.","evidence":"In vitro kinase assay, co-immunoprecipitation, siRNA knockdown with immunofluorescence in human cells","pmids":["17535851"],"confidence":"High","gaps":["Specific phosphorylation sites and their individual contributions were not mapped","Whether Nek2-dependent regulation is relevant in non-mitotic contexts was unknown"]},{"year":2009,"claim":"Characterization of the rat hd mutant revealed that centrobin is required in spermiogenesis for acroplaxome marginal ring integrity and centrosome–nucleus attachment via interaction with keratin 5, expanding centrobin's roles beyond centriole duplication to specialized cytoskeletal scaffolding.","evidence":"Genetic mapping of endogenous retroviral insertion, immunofluorescence, co-immunoprecipitation, and electron microscopy in rat hd mutant","pmids":["19710508"],"confidence":"High","gaps":["Whether the spermiogenesis phenotype is entirely cell-autonomous was not resolved","Structural basis of the centrobin–keratin 5 interaction was not determined"]},{"year":2011,"claim":"Demonstration that centrobin directly binds tubulin and that this interaction is required for centriole elongation and stability — recruited via hSAS-6 but independent of CPAP/CP110 — defined the molecular basis of centrobin's role in centriole biogenesis.","evidence":"In vitro binding assays, mutagenesis, siRNA knockdown, immunofluorescence, and electron microscopy in human cells","pmids":["21576394"],"confidence":"High","gaps":["Structural details of the centrobin–tubulin interface were not resolved","How centrobin cooperates with CPAP downstream of initial recruitment was unclear"]},{"year":2018,"claim":"CRISPR knockout and zebrafish depletion established centrobin as a positive regulator of primary ciliogenesis, showing its C-terminal domain (which binds CP110 and tubulin) is required for axonemal extension after centriole docking, and linking centrobin loss to ciliopathy-like phenotypes in vivo.","evidence":"CRISPR knockout in hTERT-RPE1 cells, electron microscopy, co-immunoprecipitation, zebrafish morpholino knockdown","pmids":["29440264"],"confidence":"High","gaps":["Mechanism by which centrobin promotes CP110 removal or axoneme nucleation is unknown","Whether centrobin mutations cause human ciliopathies has not been demonstrated","Relative contributions of the tubulin-binding versus CP110-binding activities of the C-terminal domain to ciliogenesis are unresolved"]},{"year":null,"claim":"It remains unknown how centrobin's multiple functions — centriole duplication, microtubule stabilization, spermatid coupling, and ciliogenesis — are differentially regulated in distinct cellular contexts, and no high-resolution structure of centrobin or its complexes has been determined.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of centrobin or centrobin–tubulin complex","Context-dependent regulation distinguishing centrobin's roles in mitotic versus ciliated versus spermatogenic cells is unexplored","No confirmed human disease-causing mutations in CNTROB"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,3,4]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,1,2,3,4]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,3,4]}],"complexes":[],"partners":["TUBA1A","NEK2","KRT5","CP110","SASS6"],"other_free_text":[]},"mechanistic_narrative":"Centrobin (CNTROB) is a daughter centriole-associated protein that functions in centriole duplication, elongation, and stability, and is a positive regulator of primary ciliogenesis and spermatid head–tail coupling. It directly binds tubulin in an hSAS-6-dependent manner to promote centriole assembly and structural integrity, and its C-terminal domain, which also interacts with CP110, is required for axonemal extension during ciliogenesis [PMID:21576394, PMID:29440264]. Phosphorylation by the mitotic kinase Nek2 mobilizes centrobin to cytoplasmic microtubules, where it promotes microtubule stabilization and proper spindle assembly [PMID:17535851]. During spermiogenesis, centrobin localizes to the manchette and acroplaxome marginal ring, interacts with keratin 5 intermediate filaments, and is essential for maintaining the head–tail coupling apparatus; its loss causes spermatid decapitation and male infertility [PMID:19710508]."},"prefetch_data":{"uniprot":{"accession":"Q8N137","full_name":"Centrobin","aliases":["Centrosomal BRCA2-interacting protein","LYST-interacting protein 8"],"length_aa":903,"mass_kda":101.3,"function":"Required for centriole duplication. Inhibition of centriole duplication leading to defects in cytokinesis","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole","url":"https://www.uniprot.org/uniprotkb/Q8N137/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CNTROB","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CNTROB","total_profiled":1310},"omim":[{"mim_id":"613529","title":"CENTROSOMAL PROTEIN, 152-KD; CEP152","url":"https://www.omim.org/entry/613529"},{"mim_id":"611425","title":"CENTROBIN, CENTRIOLE DUPLICATION AND SPINDLE ASSEMBLY PROTEIN; CNTROB","url":"https://www.omim.org/entry/611425"},{"mim_id":"609279","title":"CENTROMERIC PROTEIN J; CENPJ","url":"https://www.omim.org/entry/609279"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Basal body","reliability":"Supported"},{"location":"Flagellar centriole","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CNTROB"},"hgnc":{"alias_symbol":["LIP8","PP1221"],"prev_symbol":[]},"alphafold":{"accession":"Q8N137","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N137","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N137-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N137-F1-predicted_aligned_error_v6.png","plddt_mean":66.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CNTROB","jax_strain_url":"https://www.jax.org/strain/search?query=CNTROB"},"sequence":{"accession":"Q8N137","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N137.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N137/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N137"}},"corpus_meta":[{"pmid":"11131027","id":"PMC_11131027","title":"Secreted lipases of Candida albicans: cloning, characterisation and expression analysis of a new gene family with at least ten 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/21576394","citation_count":57,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11442,"output_tokens":757,"usd":0.02284},"stage2":{"model":"claude-opus-4-6","input_tokens":3925,"output_tokens":1101,"usd":0.070725},"total_usd":0.243612,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":23796,"output_tokens":1527,"usd":0.047147},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":4980,"output_tokens":1748,"usd":0.1029}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"Centrobin (CNTROB) localizes to the manchette, centrosome, and the marginal ring of the spermatid acroplaxome during spermiogenesis, where it interacts with keratin 5-containing intermediate filaments. Loss of function (via endogenous retroviral insertion causing truncated protein) results in defective acroplaxome marginal ring, separation of the centrosome from the nucleus, disruption of the head-tail coupling apparatus, and spermatid decapitation.\",\n      \"method\": \"Rat hd mutant model (endogenous retroviral insertion in Cntrob intron 10), immunofluorescence localization, co-localization with keratin 5 intermediate filaments, histological analysis of spermatid phenotype\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function model with defined molecular and cellular phenotypes, multiple orthogonal methods (genetics, localization, ultrastructure), replicated mechanistic chain\",\n      \"pmids\": [\"19710508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Centrobin primarily localizes to daughter centrioles but associates with mother centrioles upon serum starvation. CNTROB knockout in hTERT-RPE1 cells increases frequency of monocentriolar and acentriolar cells and completely abrogates primary ciliogenesis upon serum starvation, with ultrastructural analysis revealing defective axonemal extension after mother centriole docking. A C-terminal portion of centrobin that interacts with CP110 and tubulin is required for ciliogenesis.\",\n      \"method\": \"CRISPR/Cas9 knockout in hTERT-RPE1 cells, novel monoclonal antibody immunofluorescence, transmission electron microscopy, co-immunoprecipitation/interaction assays with CP110 and tubulin, zebrafish centrobin morpholino knockdown\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genome editing KO with defined cellular phenotype, ultrastructural validation, interaction mapping, orthogonal organism validation in zebrafish\",\n      \"pmids\": [\"29440264\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Centrobin (CNTROB) is a centrosomal protein that preferentially localizes to daughter centrioles and, upon serum starvation, to mother centrioles, where its C-terminal domain (interacting with CP110 and tubulin) is required to promote axonemal extension and primary ciliogenesis; in spermatids, centrobin additionally localizes to the manchette and acroplaxome marginal ring (interacting with keratin 5 intermediate filaments) to maintain centrosome–nuclear attachment and head-tail coupling apparatus integrity during spermiogenesis.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Centrobin (CNTROB) was identified as a centriole-associated protein that asymmetrically localizes to the daughter centriole. siRNA-mediated silencing of centrobin inhibited centriole duplication, resulting in centrosomes with one or no centriole, and impaired cytokinesis, demonstrating that centrobin is required for centriole duplication.\",\n      \"method\": \"siRNA knockdown, immunofluorescence microscopy, cell cycle analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal localization and loss-of-function with defined cellular phenotype; foundational paper with >100 citations replicated across multiple studies\",\n      \"pmids\": [\"16275750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Centrobin (NIP2/centrobin) was identified as a novel substrate of the mitotic kinase Nek2. Centrobin localizes to the daughter centriole and associates with stable cytoplasmic microtubules. Phosphorylation by Nek2 disperses centrobin aggregates and promotes its association with microtubules. Knockdown of centrobin caused reduced microtubule organizing activity, cell shrinkage, defective spindle assembly, and abnormal nuclear morphology, indicating a role in microtubule stabilization.\",\n      \"method\": \"Co-immunoprecipitation, kinase assay, siRNA knockdown, immunofluorescence microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — kinase-substrate relationship established by in vitro assay and Co-IP, loss-of-function phenotype with multiple orthogonal readouts\",\n      \"pmids\": [\"17535851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In rats, an endogenous retroviral insertion into intron 10 of Cntrob disrupts normal splicing and produces a truncated centrobin protein. During spermiogenesis, centrobin localizes to the manchette, centrosome, and marginal ring of the acroplaxome, where it interacts with keratin 5-containing intermediate filaments. Loss of centrobin function causes defective acroplaxome marginal ring assembly and detachment of the centrosome from the nucleus, disrupting the head-tail coupling apparatus and causing spermatid decapitation, leading to male infertility.\",\n      \"method\": \"Genetic mapping, RT-PCR, immunofluorescence, co-immunoprecipitation, electron microscopy in rat hd mutant\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic loss-of-function with multiple orthogonal methods (localization, interaction, ultrastructure) showing defined mechanistic pathway\",\n      \"pmids\": [\"19710508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Centrobin directly interacts with tubulin, and this interaction is required for centriole elongation and stability. Centrobin is recruited to the centriole biogenesis site via tubulin interaction in an hSAS-6-dependent but CPAP/CP110-independent manner. Disruption of the centrobin-tubulin interaction destabilized existing centrioles and CPAP-induced procentriole-like structures.\",\n      \"method\": \"In vitro binding assay (direct interaction), mutagenesis, siRNA knockdown, immunofluorescence, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro reconstitution of centrobin-tubulin interaction combined with mutagenesis and cellular loss-of-function phenotyping\",\n      \"pmids\": [\"21576394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Genome editing (CRISPR) of CNTROB in hTERT-RPE1 cells showed that centrobin primarily localizes to daughter centrioles but also associates with mother centrioles upon serum starvation. Centrobin loss abrogated primary ciliation; ultrastructural analysis revealed defective axonemal extension after mother centriole docking. A C-terminal portion of centrobin that interacts with CP110 and tubulin is required for ciliogenesis. Depletion of centrobin in zebrafish caused microcephaly, body curvature, and laterality defects consistent with ciliary dysfunction, identifying centrobin as a positive regulator of vertebrate ciliogenesis.\",\n      \"method\": \"CRISPR knockout, monoclonal antibody localization, electron microscopy, Co-immunoprecipitation, zebrafish morpholino knockdown\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — CRISPR loss-of-function with ultrastructural analysis, interaction mapping, and in vivo vertebrate model, multiple orthogonal methods\",\n      \"pmids\": [\"29440264\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Centrobin (CNTROB) is a daughter centriole-localized protein that is required for centriole duplication, elongation, and stability through direct interaction with tubulin (in an hSAS-6-dependent manner); it is phosphorylated by Nek2, which mobilizes it to microtubules to promote stabilization; during spermiogenesis it localizes to the manchette and acroplaxome marginal ring where it interacts with keratin 5 intermediate filaments to maintain the head-tail coupling apparatus; and its C-terminal domain, which binds CP110 and tubulin, is required for axonemal extension during primary ciliogenesis, making centrobin a positive regulator of vertebrate cilia formation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Centrobin (CNTROB) is a centriole-associated protein that localizes preferentially to daughter centrioles and relocates to mother centrioles upon serum starvation, where its C-terminal domain—interacting with CP110 and tubulin—is essential for axonemal extension and primary ciliogenesis [PMID:29440264]. During spermiogenesis, centrobin additionally localizes to the manchette and the marginal ring of the acroplaxome, interacting with keratin 5 intermediate filaments to maintain centrosome–nuclear attachment and head–tail coupling apparatus integrity; loss of function causes spermatid decapitation [PMID:19710508].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"It was unknown how the centrosome remained attached to the spermatid nucleus during elongation; the hd rat mutant revealed that centrobin localizes to the manchette, centrosome, and acroplaxome marginal ring and is required for centrosome–nuclear coupling and head–tail coupling apparatus integrity via interaction with keratin 5 intermediate filaments.\",\n      \"evidence\": \"Rat hd mutant (endogenous retroviral insertion truncating Cntrob), immunofluorescence co-localization with keratin 5, ultrastructural phenotyping of spermatids\",\n      \"pmids\": [\"19710508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The precise biochemical basis of the centrobin–keratin 5 interaction is uncharacterized\",\n        \"Whether centrobin's spermiogenesis role is conserved in species beyond rat is untested\",\n        \"The contribution of the truncated centrobin protein versus complete loss of function was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Whether centrobin had a somatic cell function beyond centriole duplication was unclear; CRISPR knockout in RPE1 cells demonstrated that centrobin relocates to mother centrioles upon serum starvation and is required for axonemal extension and primary ciliogenesis, with its C-terminal CP110/tubulin-binding region being necessary and sufficient.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in hTERT-RPE1 cells, transmission electron microscopy of ciliary ultrastructure, co-immunoprecipitation with CP110 and tubulin, zebrafish morpholino knockdown validation\",\n      \"pmids\": [\"29440264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How centrobin coordinates with CP110 removal from the mother centriole to permit axonemal extension is mechanistically undefined\",\n        \"The structural basis of centrobin's C-terminal interactions with CP110 and tubulin lacks atomic-level resolution\",\n        \"Whether centrobin functions in motile ciliogenesis or only primary ciliogenesis has not been tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified structural and regulatory model explaining how centrobin integrates its centriole-duplication, ciliogenesis, and spermiogenesis functions—and whether these reflect a common tubulin/intermediate-filament scaffolding activity—remains to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of centrobin exists\",\n        \"Post-translational regulation of centrobin localization switching (daughter to mother centriole) is unknown\",\n        \"Whether centrobin loss causes ciliopathy phenotypes in mammals in vivo has not been demonstrated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CP110\", \"KRT5\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Centrobin (CNTROB) is a daughter centriole-associated protein that functions in centriole duplication, elongation, and stability, and is a positive regulator of primary ciliogenesis and spermatid head–tail coupling. It directly binds tubulin in an hSAS-6-dependent manner to promote centriole assembly and structural integrity, and its C-terminal domain, which also interacts with CP110, is required for axonemal extension during ciliogenesis [PMID:21576394, PMID:29440264]. Phosphorylation by the mitotic kinase Nek2 mobilizes centrobin to cytoplasmic microtubules, where it promotes microtubule stabilization and proper spindle assembly [PMID:17535851]. During spermiogenesis, centrobin localizes to the manchette and acroplaxome marginal ring, interacts with keratin 5 intermediate filaments, and is essential for maintaining the head–tail coupling apparatus; its loss causes spermatid decapitation and male infertility [PMID:19710508].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of centrobin as the first marker of the daughter centriole and demonstration that it is required for centriole duplication resolved the question of whether centriole biogenesis depends on a centriole-intrinsic asymmetric factor.\",\n      \"evidence\": \"siRNA knockdown and immunofluorescence in cultured human cells\",\n      \"pmids\": [\"16275750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which centrobin promotes duplication was unknown\",\n        \"Direct molecular binding partners were not identified\",\n        \"Whether centrobin functions beyond centriole duplication was untested\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing Nek2 as a kinase that phosphorylates centrobin and regulates its redistribution to microtubules showed how centrobin activity is controlled during the cell cycle and linked it to microtubule stabilization and spindle assembly.\",\n      \"evidence\": \"In vitro kinase assay, co-immunoprecipitation, siRNA knockdown with immunofluorescence in human cells\",\n      \"pmids\": [\"17535851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific phosphorylation sites and their individual contributions were not mapped\",\n        \"Whether Nek2-dependent regulation is relevant in non-mitotic contexts was unknown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Characterization of the rat hd mutant revealed that centrobin is required in spermiogenesis for acroplaxome marginal ring integrity and centrosome–nucleus attachment via interaction with keratin 5, expanding centrobin's roles beyond centriole duplication to specialized cytoskeletal scaffolding.\",\n      \"evidence\": \"Genetic mapping of endogenous retroviral insertion, immunofluorescence, co-immunoprecipitation, and electron microscopy in rat hd mutant\",\n      \"pmids\": [\"19710508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether the spermiogenesis phenotype is entirely cell-autonomous was not resolved\",\n        \"Structural basis of the centrobin–keratin 5 interaction was not determined\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstration that centrobin directly binds tubulin and that this interaction is required for centriole elongation and stability — recruited via hSAS-6 but independent of CPAP/CP110 — defined the molecular basis of centrobin's role in centriole biogenesis.\",\n      \"evidence\": \"In vitro binding assays, mutagenesis, siRNA knockdown, immunofluorescence, and electron microscopy in human cells\",\n      \"pmids\": [\"21576394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural details of the centrobin–tubulin interface were not resolved\",\n        \"How centrobin cooperates with CPAP downstream of initial recruitment was unclear\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CRISPR knockout and zebrafish depletion established centrobin as a positive regulator of primary ciliogenesis, showing its C-terminal domain (which binds CP110 and tubulin) is required for axonemal extension after centriole docking, and linking centrobin loss to ciliopathy-like phenotypes in vivo.\",\n      \"evidence\": \"CRISPR knockout in hTERT-RPE1 cells, electron microscopy, co-immunoprecipitation, zebrafish morpholino knockdown\",\n      \"pmids\": [\"29440264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which centrobin promotes CP110 removal or axoneme nucleation is unknown\",\n        \"Whether centrobin mutations cause human ciliopathies has not been demonstrated\",\n        \"Relative contributions of the tubulin-binding versus CP110-binding activities of the C-terminal domain to ciliogenesis are unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how centrobin's multiple functions — centriole duplication, microtubule stabilization, spermatid coupling, and ciliogenesis — are differentially regulated in distinct cellular contexts, and no high-resolution structure of centrobin or its complexes has been determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No atomic-resolution structure of centrobin or centrobin–tubulin complex\",\n        \"Context-dependent regulation distinguishing centrobin's roles in mitotic versus ciliated versus spermatogenic cells is unexplored\",\n        \"No confirmed human disease-causing mutations in CNTROB\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TUBA1A\",\n      \"NEK2\",\n      \"KRT5\",\n      \"CP110\",\n      \"SASS6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}