{"gene":"NEK5","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2015,"finding":"NEK5 localizes to the proximal ends of centrioles and is required for centrosome integrity in interphase; depletion of NEK5 or overexpression of kinase-inactive NEK5 causes unscheduled centrosome separation, excess recruitment of rootletin (centrosome linker protein), reduced levels of Nek2 at centrosomes, and loss of PCM components (γ-tubulin, pericentrin, Cdk5Rap2), resulting in reduced microtubule nucleation.","method":"Immunofluorescence localization, siRNA depletion, overexpression of kinase-inactive mutant, quantification of centrosome components","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (localization, KD, kinase-dead OE) with specific cellular phenotypes, replicated across conditions in a focused mechanistic study","pmids":["25963817"],"is_preprint":false},{"year":2015,"finding":"NEK5 depletion leads to inappropriate retention of centrosome linker components upon mitotic entry, causing delayed centrosome separation and defective chromosome segregation; NEK5 is required for loss of centrosome linker proteins and enhanced microtubule nucleation to enable timely bipolar spindle formation.","method":"siRNA depletion, live-cell imaging, immunofluorescence for centrosome linker components and spindle assembly","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods in one focused mechanistic study with specific mitotic phenotypes","pmids":["25963817"],"is_preprint":false},{"year":2015,"finding":"NEK5 interacts with mitochondrial proteins Cox11, MTX-2, and BCLAF1 (identified by yeast two-hybrid screen); stable NEK5 expression reduces mitochondrial respiratory chain activity (particularly complex IV), while NEK5 silencing increases basal respiration rates and ROS formation after thapsigargin treatment, and NEK5 kinase activity is required for these effects.","method":"Yeast two-hybrid screen, shRNA silencing, kinase-dead mutant expression, mitochondrial respiration assays, ROS measurement, apoptosis assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Y2H interaction plus functional assays in cells, single lab with multiple orthogonal methods","pmids":["25725288"],"is_preprint":false},{"year":2013,"finding":"NEK5 is a substrate for caspase-3 cleavage; caspase-3-mediated cleavage of NEK5 enhances caspase activity, and NEK5 promotes skeletal muscle differentiation (myotube formation) through this upregulation of caspase activity; NEK5 knockdown inhibits myotube formation.","method":"In vitro caspase-3 cleavage assay, siRNA knockdown, overexpression, myotube formation assay, caspase activity assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro cleavage assay combined with KD and OE cellular phenotype, single lab","pmids":["23727203"],"is_preprint":false},{"year":2019,"finding":"NEK5 interacts with Cyclin A2 (identified as a novel binding partner), and NEK5 upregulates Cyclin A2 while downregulating Cyclin D1, Cyclin D3, and Cyclin E1 in breast cancer cells; NEK5 silencing suppresses proliferation in vitro and in vivo.","method":"Co-immunoprecipitation (interaction), western blot (cyclin levels), siRNA silencing, MTT assay, xenograft mouse model","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP for interaction plus multiple functional readouts, single lab","pmids":["30675923"],"is_preprint":false},{"year":2021,"finding":"NEK5 interacts with LonP1 (an AAA+ mitochondrial protease involved in protein quality control and mtDNA remodeling) within mitochondria, and NEK5 kinase activity is required for maintaining mitochondrial mass, functionality, and mtDNA integrity after oxidative damage; NEK5 may be involved in the LonP1-TFAM signaling module.","method":"Co-immunoprecipitation, mitochondrial fractionation, kinase-dead mutant, mitochondrial mass/function assays, mtDNA integrity assay after oxidative stress","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction plus kinase-dead mutant plus multiple functional assays, single lab","pmids":["33547867"],"is_preprint":false},{"year":2019,"finding":"NEK5 interacts with Topoisomerase IIβ (TOPIIβ); this complex forms immediately after etoposide treatment, and NEK5 depletion increases DNA double-strand break damage and impairs proper DNA damage response, indicating NEK5 contributes to genomic stability in the context of etoposide-induced DNA breaks.","method":"Co-immunoprecipitation, proximity ligation assay (interaction dynamics), alkaline comet assay, siRNA silencing","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction validated by two methods (Co-IP + PLA), functional KD phenotype, single lab","pmids":["31090963"],"is_preprint":false},{"year":2019,"finding":"In mouse oocytes, NEK5 localizes to cytoplasm at GV stage, concentrates around chromosomes at GVBD, and localizes to the entire meiotic spindle at prometaphase I through MII; NEK5 depletion increases CDK1 phosphorylation and reduces maturation-promoting factor (MPF) activity, impairing germinal vesicle breakdown (GVBD); this failure of meiotic resumption is rescued by co-depletion of Wee1B, placing NEK5 upstream of Wee1B in the G2/M transition pathway.","method":"siRNA depletion, immunofluorescence localization, western blot (CDK1 phosphorylation), MPF activity assay, genetic epistasis (double KD with Wee1B)","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis experiment (Wee1B rescue) plus localization and phosphorylation assays, single lab in mouse oocyte model","pmids":["31304658"],"is_preprint":false},{"year":2021,"finding":"NEK5 overexpression in breast epithelial cells alters cell morphology and promotes cell migration (independent of proliferation effects); NEK5 activity modulates cytoskeletal reorganization.","method":"Stable overexpression and shRNA knockdown cell lines, immunofluorescence of cytoskeletal components, Ki-67 staining, transwell migration assay, in vivo murine xenograft","journal":"Breast cancer research and treatment","confidence":"Low","confidence_rationale":"Tier 3 / Weak — phenotypic characterization without molecular mechanism for cytoskeletal regulation, single lab","pmids":["34196902"],"is_preprint":false},{"year":2022,"finding":"NEK5 interactome (by BioID proximity labeling) in breast epithelial cells includes kinesins KIF2C and KIF22, mitochondrial proteins TFAM, TFB2M and MFN2, RhoH effectors, and the Src negative regulator CSK; NEK5 overexpression reduces Src activation and downstream signaling; phosphoproteomic profiling reveals NEK5 impacts cell cycle, DNA synthesis/repair, Rho GTPase signaling, microtubule cytoskeleton, and hemidesmosome assembly pathways.","method":"BioID proximity labeling MS interactome, global MS-based phosphoproteomic profiling, western blot (Src signaling), 3D Matrigel culture","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BioID interactome plus phosphoproteomic profiling plus functional Src signaling validation, single lab with multiple orthogonal MS approaches","pmids":["36550548"],"is_preprint":false}],"current_model":"NEK5 is a NIMA-related kinase that localizes to centriole proximal ends and is required for centrosome integrity in interphase and timely centrosome linker dissolution/bipolar spindle formation in mitosis; it additionally localizes to mitochondria where it interacts with LonP1 and other mitochondrial proteins to regulate respiratory chain activity and mtDNA maintenance, interacts with Topoisomerase IIβ to support DNA damage response, is cleaved by caspase-3 to promote myogenic differentiation, and interacts with Cyclin A2 and other cell cycle regulators; in meiosis, NEK5 acts upstream of Wee1B to regulate CDK1 activity and enable G2/M transition."},"narrative":{"mechanistic_narrative":"NEK5 is a NIMA-related kinase that governs centrosome integrity and the centrosome cycle: it localizes to the proximal ends of centrioles, and its kinase activity is required to maintain pericentriolar material and microtubule nucleation in interphase while preventing premature centrosome separation [PMID:25963817]. On mitotic entry, NEK5 drives the timely loss of centrosome linker proteins to enable centrosome separation, bipolar spindle formation, and accurate chromosome segregation [PMID:25963817]. Beyond the centrosome, NEK5 has a kinase-dependent mitochondrial function, interacting with the AAA+ protease LonP1 and with mitochondrial proteins (Cox11, MTX-2, BCLAF1) to control respiratory chain activity, ROS, mitochondrial mass, and mtDNA integrity after oxidative damage [PMID:25725288, PMID:33547867]. NEK5 also contributes to genome stability through an interaction with Topoisomerase IIβ that forms after etoposide treatment, with NEK5 loss increasing double-strand breaks [PMID:31090963]. In cell-cycle and proliferative contexts it binds Cyclin A2 and remodels cyclin levels to support proliferation [PMID:30675923], and in mouse oocyte meiosis it acts upstream of Wee1B to relieve inhibitory CDK1 phosphorylation and permit the G2/M transition [PMID:31304658]. NEK5 is additionally a caspase-3 substrate whose cleavage promotes skeletal muscle differentiation [PMID:23727203].","teleology":[{"year":2013,"claim":"Established that NEK5 is regulated by proteolytic cleavage and links to a differentiation program, answering whether NEK5 has roles beyond cell division.","evidence":"In vitro caspase-3 cleavage assay with siRNA knockdown, overexpression, and myotube formation/caspase activity assays","pmids":["23727203"],"confidence":"Medium","gaps":["Cleavage site and the catalytic state of the cleaved fragment not defined","Direct kinase substrates in the myogenic program unidentified"]},{"year":2015,"claim":"Defined NEK5 as a centriole-proximal kinase required for centrosome integrity, resolving its core localization and function.","evidence":"Immunofluorescence localization, siRNA depletion, and kinase-inactive overexpression scoring centrosome components in human cells","pmids":["25963817"],"confidence":"High","gaps":["Direct substrates at the centrosome not identified","How NEK5 restrains rootletin recruitment mechanistically unknown"]},{"year":2015,"claim":"Showed NEK5 controls mitotic centrosome separation and spindle bipolarity, connecting interphase centrosome integrity to faithful chromosome segregation.","evidence":"siRNA depletion with live-cell imaging and immunofluorescence of centrosome linker and spindle markers","pmids":["25963817"],"confidence":"High","gaps":["Phosphorylation targets driving linker dissolution not mapped","Regulatory relationship to other mitotic kinases unresolved"]},{"year":2015,"claim":"Revealed an unexpected mitochondrial role, showing NEK5 kinase activity modulates respiratory chain output and ROS, broadening its functional scope.","evidence":"Yeast two-hybrid screen plus shRNA silencing, kinase-dead mutant, respiration and ROS assays","pmids":["25725288"],"confidence":"Medium","gaps":["Whether Cox11/MTX-2/BCLAF1 are direct phosphorylation substrates not shown","Mechanism coupling NEK5 to complex IV activity undefined"]},{"year":2019,"claim":"Connected NEK5 to the DNA damage response, showing it partners with TOPIIβ to limit double-strand break accumulation.","evidence":"Co-IP and proximity ligation assay for interaction dynamics with comet assay after etoposide and siRNA silencing","pmids":["31090963"],"confidence":"Medium","gaps":["Whether NEK5 phosphorylates TOPIIβ not established","Step in the DDR pathway where NEK5 acts unclear"]},{"year":2019,"claim":"Implicated NEK5 in proliferative control via Cyclin A2 binding and cyclin remodeling in cancer cells.","evidence":"Co-IP, western blot of cyclins, siRNA silencing, MTT assay and xenograft model in breast cancer","pmids":["30675923"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation","Direct vs indirect regulation of cyclin levels not distinguished"]},{"year":2019,"claim":"Placed NEK5 in the meiotic G2/M switch upstream of Wee1B, defining a regulatory input controlling CDK1/MPF activation.","evidence":"siRNA depletion, localization, CDK1 phosphorylation western blot, MPF assay, and Wee1B co-depletion epistasis in mouse oocytes","pmids":["31304658"],"confidence":"Medium","gaps":["Direct substrate linking NEK5 to Wee1B regulation unknown","Generalizability beyond mouse oocytes untested"]},{"year":2021,"claim":"Extended the mitochondrial role by showing NEK5–LonP1 interaction supports mitochondrial mass and mtDNA integrity under oxidative stress.","evidence":"Co-IP, mitochondrial fractionation, kinase-dead mutant, mitochondrial mass/function and mtDNA integrity assays","pmids":["33547867"],"confidence":"Medium","gaps":["Whether LonP1 or TFAM are NEK5 phosphosubstrates not shown","Direct evidence for the proposed LonP1-TFAM module incomplete"]},{"year":2021,"claim":"Linked NEK5 activity to cytoskeletal reorganization and cell migration independent of proliferation.","evidence":"Stable overexpression/shRNA lines, cytoskeletal immunofluorescence, transwell migration, and murine xenograft","pmids":["34196902"],"confidence":"Low","gaps":["No molecular mechanism for cytoskeletal regulation identified","Phenotype not tied to a defined substrate or pathway"]},{"year":2022,"claim":"Defined a NEK5 proximity interactome and phosphoproteome, integrating its centrosomal, mitochondrial, cytoskeletal and signaling roles and adding Src-pathway regulation.","evidence":"BioID proximity labeling MS, global phosphoproteomics, Src signaling western blot, 3D Matrigel culture in breast epithelial cells","pmids":["36550548"],"confidence":"Medium","gaps":["Direct substrates among phosphoproteome hits not validated","Which interactome members are bona fide substrates vs proximity neighbors unresolved"]},{"year":null,"claim":"The direct physiological substrates of NEK5 kinase activity remain unidentified across all its reported compartments and functions.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No validated direct phosphosubstrate at the centrosome, mitochondria, or in the DDR","Structural basis of substrate recognition unknown","Regulation of NEK5 kinase activation not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[2,5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[7]}],"complexes":[],"partners":["LONP1","TOPIIB","CCNA2","COX11","MTX2","BCLAF1","WEE1B","CSK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6P3R8","full_name":"Serine/threonine-protein kinase Nek5","aliases":["Never in mitosis A-related kinase 5","NimA-related protein kinase 5"],"length_aa":708,"mass_kda":81.4,"function":"","subcellular_location":"Cell projection, cilium; Cell projection, cilium, flagellum","url":"https://www.uniprot.org/uniprotkb/Q6P3R8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NEK5","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NEK5","total_profiled":1310},"omim":[{"mim_id":"616731","title":"NIMA-RELATED KINASE 5; NEK5","url":"https://www.omim.org/entry/616731"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"fallopian tube","ntpm":8.1},{"tissue":"testis","ntpm":10.0}],"url":"https://www.proteinatlas.org/search/NEK5"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q6P3R8","domains":[{"cath_id":"3.30.200.20","chopping":"2-82","consensus_level":"medium","plddt":84.9958,"start":2,"end":82},{"cath_id":"1.10.510.10","chopping":"84-277","consensus_level":"high","plddt":88.421,"start":84,"end":277}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6P3R8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6P3R8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6P3R8-F1-predicted_aligned_error_v6.png","plddt_mean":59.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NEK5","jax_strain_url":"https://www.jax.org/strain/search?query=NEK5"},"sequence":{"accession":"Q6P3R8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6P3R8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6P3R8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6P3R8"}},"corpus_meta":[{"pmid":"25963817","id":"PMC_25963817","title":"Nek5 promotes centrosome integrity in interphase and loss of centrosome cohesion in mitosis.","date":"2015","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/25963817","citation_count":40,"is_preprint":false},{"pmid":"25725288","id":"PMC_25725288","title":"Nek5 interacts with mitochondrial proteins and interferes negatively in mitochondrial mediated cell death and respiration.","date":"2015","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/25725288","citation_count":30,"is_preprint":false},{"pmid":"30675923","id":"PMC_30675923","title":"NEK5 promotes breast cancer cell proliferation through up-regulation of Cyclin A2.","date":"2019","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/30675923","citation_count":25,"is_preprint":false},{"pmid":"23727203","id":"PMC_23727203","title":"Nek5, a novel substrate for caspase-3, promotes skeletal muscle differentiation by up-regulating caspase activity.","date":"2013","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/23727203","citation_count":24,"is_preprint":false},{"pmid":"32196601","id":"PMC_32196601","title":"Knockdown of lncRNA XIST inhibits hypoxia-induced glycolysis, migration and invasion through regulating miR-381-3p/NEK5 axis in nasopharyngeal carcinoma.","date":"2020","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32196601","citation_count":22,"is_preprint":false},{"pmid":"33547867","id":"PMC_33547867","title":"NEK5 interacts with LonP1 and its kinase activity is essential for the regulation of mitochondrial functions and mtDNA maintenance.","date":"2021","source":"FEBS open bio","url":"https://pubmed.ncbi.nlm.nih.gov/33547867","citation_count":19,"is_preprint":false},{"pmid":"31090963","id":"PMC_31090963","title":"NEK5 interacts with topoisomerase IIβ and is involved in the DNA damage response induced by etoposide.","date":"2019","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31090963","citation_count":16,"is_preprint":false},{"pmid":"34196902","id":"PMC_34196902","title":"NEK5 activity regulates the mesenchymal and migratory phenotype in breast cancer cells.","date":"2021","source":"Breast cancer research and treatment","url":"https://pubmed.ncbi.nlm.nih.gov/34196902","citation_count":14,"is_preprint":false},{"pmid":"36550548","id":"PMC_36550548","title":"Identification of biological pathways and processes regulated by NEK5 in breast epithelial cells via an integrated proteomic approach.","date":"2022","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/36550548","citation_count":7,"is_preprint":false},{"pmid":"31304658","id":"PMC_31304658","title":"NEK5 regulates cell cycle progression during mouse oocyte maturation and preimplantation embryonic development.","date":"2019","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/31304658","citation_count":6,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6830,"output_tokens":2605,"usd":0.029782,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9840,"output_tokens":3224,"usd":0.0649,"stage2_stop_reason":"end_turn"},"total_usd":0.094682,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK5 localizes to the proximal ends of centrioles and is required for centrosome integrity in interphase; depletion of NEK5 or overexpression of kinase-inactive NEK5 causes unscheduled centrosome separation, excess recruitment of rootletin (centrosome linker protein), reduced levels of Nek2 at centrosomes, and loss of PCM components (γ-tubulin, pericentrin, Cdk5Rap2), resulting in reduced microtubule nucleation.\",\n      \"method\": \"Immunofluorescence localization, siRNA depletion, overexpression of kinase-inactive mutant, quantification of centrosome components\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (localization, KD, kinase-dead OE) with specific cellular phenotypes, replicated across conditions in a focused mechanistic study\",\n      \"pmids\": [\"25963817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK5 depletion leads to inappropriate retention of centrosome linker components upon mitotic entry, causing delayed centrosome separation and defective chromosome segregation; NEK5 is required for loss of centrosome linker proteins and enhanced microtubule nucleation to enable timely bipolar spindle formation.\",\n      \"method\": \"siRNA depletion, live-cell imaging, immunofluorescence for centrosome linker components and spindle assembly\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods in one focused mechanistic study with specific mitotic phenotypes\",\n      \"pmids\": [\"25963817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK5 interacts with mitochondrial proteins Cox11, MTX-2, and BCLAF1 (identified by yeast two-hybrid screen); stable NEK5 expression reduces mitochondrial respiratory chain activity (particularly complex IV), while NEK5 silencing increases basal respiration rates and ROS formation after thapsigargin treatment, and NEK5 kinase activity is required for these effects.\",\n      \"method\": \"Yeast two-hybrid screen, shRNA silencing, kinase-dead mutant expression, mitochondrial respiration assays, ROS measurement, apoptosis assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Y2H interaction plus functional assays in cells, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25725288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NEK5 is a substrate for caspase-3 cleavage; caspase-3-mediated cleavage of NEK5 enhances caspase activity, and NEK5 promotes skeletal muscle differentiation (myotube formation) through this upregulation of caspase activity; NEK5 knockdown inhibits myotube formation.\",\n      \"method\": \"In vitro caspase-3 cleavage assay, siRNA knockdown, overexpression, myotube formation assay, caspase activity assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro cleavage assay combined with KD and OE cellular phenotype, single lab\",\n      \"pmids\": [\"23727203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEK5 interacts with Cyclin A2 (identified as a novel binding partner), and NEK5 upregulates Cyclin A2 while downregulating Cyclin D1, Cyclin D3, and Cyclin E1 in breast cancer cells; NEK5 silencing suppresses proliferation in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation (interaction), western blot (cyclin levels), siRNA silencing, MTT assay, xenograft mouse model\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP for interaction plus multiple functional readouts, single lab\",\n      \"pmids\": [\"30675923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NEK5 interacts with LonP1 (an AAA+ mitochondrial protease involved in protein quality control and mtDNA remodeling) within mitochondria, and NEK5 kinase activity is required for maintaining mitochondrial mass, functionality, and mtDNA integrity after oxidative damage; NEK5 may be involved in the LonP1-TFAM signaling module.\",\n      \"method\": \"Co-immunoprecipitation, mitochondrial fractionation, kinase-dead mutant, mitochondrial mass/function assays, mtDNA integrity assay after oxidative stress\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction plus kinase-dead mutant plus multiple functional assays, single lab\",\n      \"pmids\": [\"33547867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEK5 interacts with Topoisomerase IIβ (TOPIIβ); this complex forms immediately after etoposide treatment, and NEK5 depletion increases DNA double-strand break damage and impairs proper DNA damage response, indicating NEK5 contributes to genomic stability in the context of etoposide-induced DNA breaks.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay (interaction dynamics), alkaline comet assay, siRNA silencing\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction validated by two methods (Co-IP + PLA), functional KD phenotype, single lab\",\n      \"pmids\": [\"31090963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In mouse oocytes, NEK5 localizes to cytoplasm at GV stage, concentrates around chromosomes at GVBD, and localizes to the entire meiotic spindle at prometaphase I through MII; NEK5 depletion increases CDK1 phosphorylation and reduces maturation-promoting factor (MPF) activity, impairing germinal vesicle breakdown (GVBD); this failure of meiotic resumption is rescued by co-depletion of Wee1B, placing NEK5 upstream of Wee1B in the G2/M transition pathway.\",\n      \"method\": \"siRNA depletion, immunofluorescence localization, western blot (CDK1 phosphorylation), MPF activity assay, genetic epistasis (double KD with Wee1B)\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis experiment (Wee1B rescue) plus localization and phosphorylation assays, single lab in mouse oocyte model\",\n      \"pmids\": [\"31304658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NEK5 overexpression in breast epithelial cells alters cell morphology and promotes cell migration (independent of proliferation effects); NEK5 activity modulates cytoskeletal reorganization.\",\n      \"method\": \"Stable overexpression and shRNA knockdown cell lines, immunofluorescence of cytoskeletal components, Ki-67 staining, transwell migration assay, in vivo murine xenograft\",\n      \"journal\": \"Breast cancer research and treatment\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — phenotypic characterization without molecular mechanism for cytoskeletal regulation, single lab\",\n      \"pmids\": [\"34196902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NEK5 interactome (by BioID proximity labeling) in breast epithelial cells includes kinesins KIF2C and KIF22, mitochondrial proteins TFAM, TFB2M and MFN2, RhoH effectors, and the Src negative regulator CSK; NEK5 overexpression reduces Src activation and downstream signaling; phosphoproteomic profiling reveals NEK5 impacts cell cycle, DNA synthesis/repair, Rho GTPase signaling, microtubule cytoskeleton, and hemidesmosome assembly pathways.\",\n      \"method\": \"BioID proximity labeling MS interactome, global MS-based phosphoproteomic profiling, western blot (Src signaling), 3D Matrigel culture\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BioID interactome plus phosphoproteomic profiling plus functional Src signaling validation, single lab with multiple orthogonal MS approaches\",\n      \"pmids\": [\"36550548\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NEK5 is a NIMA-related kinase that localizes to centriole proximal ends and is required for centrosome integrity in interphase and timely centrosome linker dissolution/bipolar spindle formation in mitosis; it additionally localizes to mitochondria where it interacts with LonP1 and other mitochondrial proteins to regulate respiratory chain activity and mtDNA maintenance, interacts with Topoisomerase IIβ to support DNA damage response, is cleaved by caspase-3 to promote myogenic differentiation, and interacts with Cyclin A2 and other cell cycle regulators; in meiosis, NEK5 acts upstream of Wee1B to regulate CDK1 activity and enable G2/M transition.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NEK5 is a NIMA-related kinase that governs centrosome integrity and the centrosome cycle: it localizes to the proximal ends of centrioles, and its kinase activity is required to maintain pericentriolar material and microtubule nucleation in interphase while preventing premature centrosome separation [#0]. On mitotic entry, NEK5 drives the timely loss of centrosome linker proteins to enable centrosome separation, bipolar spindle formation, and accurate chromosome segregation [#1]. Beyond the centrosome, NEK5 has a kinase-dependent mitochondrial function, interacting with the AAA+ protease LonP1 and with mitochondrial proteins (Cox11, MTX-2, BCLAF1) to control respiratory chain activity, ROS, mitochondrial mass, and mtDNA integrity after oxidative damage [#2, #5]. NEK5 also contributes to genome stability through an interaction with Topoisomerase IIβ that forms after etoposide treatment, with NEK5 loss increasing double-strand breaks [#6]. In cell-cycle and proliferative contexts it binds Cyclin A2 and remodels cyclin levels to support proliferation [#4], and in mouse oocyte meiosis it acts upstream of Wee1B to relieve inhibitory CDK1 phosphorylation and permit the G2/M transition [#7]. NEK5 is additionally a caspase-3 substrate whose cleavage promotes skeletal muscle differentiation [#3].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that NEK5 is regulated by proteolytic cleavage and links to a differentiation program, answering whether NEK5 has roles beyond cell division.\",\n      \"evidence\": \"In vitro caspase-3 cleavage assay with siRNA knockdown, overexpression, and myotube formation/caspase activity assays\",\n      \"pmids\": [\"23727203\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage site and the catalytic state of the cleaved fragment not defined\", \"Direct kinase substrates in the myogenic program unidentified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined NEK5 as a centriole-proximal kinase required for centrosome integrity, resolving its core localization and function.\",\n      \"evidence\": \"Immunofluorescence localization, siRNA depletion, and kinase-inactive overexpression scoring centrosome components in human cells\",\n      \"pmids\": [\"25963817\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct substrates at the centrosome not identified\", \"How NEK5 restrains rootletin recruitment mechanistically unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed NEK5 controls mitotic centrosome separation and spindle bipolarity, connecting interphase centrosome integrity to faithful chromosome segregation.\",\n      \"evidence\": \"siRNA depletion with live-cell imaging and immunofluorescence of centrosome linker and spindle markers\",\n      \"pmids\": [\"25963817\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation targets driving linker dissolution not mapped\", \"Regulatory relationship to other mitotic kinases unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed an unexpected mitochondrial role, showing NEK5 kinase activity modulates respiratory chain output and ROS, broadening its functional scope.\",\n      \"evidence\": \"Yeast two-hybrid screen plus shRNA silencing, kinase-dead mutant, respiration and ROS assays\",\n      \"pmids\": [\"25725288\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Cox11/MTX-2/BCLAF1 are direct phosphorylation substrates not shown\", \"Mechanism coupling NEK5 to complex IV activity undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected NEK5 to the DNA damage response, showing it partners with TOPIIβ to limit double-strand break accumulation.\",\n      \"evidence\": \"Co-IP and proximity ligation assay for interaction dynamics with comet assay after etoposide and siRNA silencing\",\n      \"pmids\": [\"31090963\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NEK5 phosphorylates TOPIIβ not established\", \"Step in the DDR pathway where NEK5 acts unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated NEK5 in proliferative control via Cyclin A2 binding and cyclin remodeling in cancer cells.\",\n      \"evidence\": \"Co-IP, western blot of cyclins, siRNA silencing, MTT assay and xenograft model in breast cancer\",\n      \"pmids\": [\"30675923\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"Direct vs indirect regulation of cyclin levels not distinguished\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed NEK5 in the meiotic G2/M switch upstream of Wee1B, defining a regulatory input controlling CDK1/MPF activation.\",\n      \"evidence\": \"siRNA depletion, localization, CDK1 phosphorylation western blot, MPF assay, and Wee1B co-depletion epistasis in mouse oocytes\",\n      \"pmids\": [\"31304658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate linking NEK5 to Wee1B regulation unknown\", \"Generalizability beyond mouse oocytes untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended the mitochondrial role by showing NEK5–LonP1 interaction supports mitochondrial mass and mtDNA integrity under oxidative stress.\",\n      \"evidence\": \"Co-IP, mitochondrial fractionation, kinase-dead mutant, mitochondrial mass/function and mtDNA integrity assays\",\n      \"pmids\": [\"33547867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LonP1 or TFAM are NEK5 phosphosubstrates not shown\", \"Direct evidence for the proposed LonP1-TFAM module incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked NEK5 activity to cytoskeletal reorganization and cell migration independent of proliferation.\",\n      \"evidence\": \"Stable overexpression/shRNA lines, cytoskeletal immunofluorescence, transwell migration, and murine xenograft\",\n      \"pmids\": [\"34196902\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No molecular mechanism for cytoskeletal regulation identified\", \"Phenotype not tied to a defined substrate or pathway\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a NEK5 proximity interactome and phosphoproteome, integrating its centrosomal, mitochondrial, cytoskeletal and signaling roles and adding Src-pathway regulation.\",\n      \"evidence\": \"BioID proximity labeling MS, global phosphoproteomics, Src signaling western blot, 3D Matrigel culture in breast epithelial cells\",\n      \"pmids\": [\"36550548\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrates among phosphoproteome hits not validated\", \"Which interactome members are bona fide substrates vs proximity neighbors unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct physiological substrates of NEK5 kinase activity remain unidentified across all its reported compartments and functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No validated direct phosphosubstrate at the centrosome, mitochondria, or in the DDR\", \"Structural basis of substrate recognition unknown\", \"Regulation of NEK5 kinase activation not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"LonP1\", \"TOPIIB\", \"CCNA2\", \"Cox11\", \"MTX2\", \"BCLAF1\", \"Wee1B\", \"CSK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":6,"faith_total":6,"faith_pct":100.0}}