{"gene":"DCTN2","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":2006,"finding":"DCTN2 (dynactin-2/dynamitin) overexpression disrupts the dynein-dynactin motor complex, causing alterations in microtubule-directed movement of molecular cargoes (e.g., TP53) and organelles (e.g., Golgi), centrosome biology, cellular movement, and mitosis, with predisposition to mitotic block and polyploidy. In SJSA-1 osteosarcoma cells with genomic DCTN2 amplification and sustained overexpression, diminished centrosome and Golgi marker focus was observed by immunofluorescence microscopy.","method":"QFMPCR for genomic amplification, Western blot, immunofluorescence microscopy, overexpression studies in cancer cell lines","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression with defined cellular phenotypes (Golgi, centrosome) using multiple orthogonal methods in a single lab; mechanistic link to dynein-dynactin disruption supported by prior transient overexpression literature cited in the abstract","pmids":["16369996"],"is_preprint":false},{"year":2013,"finding":"Overexpression of DCTN2 (dynamitin/p50) interferes with dynein activity, blocking autophagosome clustering at the pericentrosomal region during hypertonic stress. Genetic interference of dynein activity via DCTN2 overexpression reduced autophagosome trafficking and autophagic flux, demonstrating that DCTN2 functions as part of the dynein-dynactin complex required for microtubule-dependent autophagosome transport.","method":"DCTN2 overexpression (genetic dynein inhibition), LC3/ATG12 immunofluorescence, autophagy flux assays in cells under hypertonic stress","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic overexpression with defined autophagy phenotype, single lab, multiple fluorescent markers","pmids":["23380587"],"is_preprint":false},{"year":2014,"finding":"DCTN2 (dynamitin) overexpression disrupts the dynein complex and blocks ROS-induced dynein ATPase activation, autophagosome movement, and autophagolysosome formation in coronary arterial myocytes (CAMs), establishing DCTN2 as a structural component whose disruption abolishes dynein-mediated autophagosome trafficking.","method":"DCTN2 overexpression, dynein ATPase activity assay, live-cell autophagosome movement tracking, autophagolysosome formation assay in primary CAMs","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression with enzymatic (ATPase) and cell biological readouts, single lab, multiple orthogonal methods","pmids":["24912985"],"is_preprint":false},{"year":2016,"finding":"DCTN2/p50/dynamitin interacts with the murine leukemia virus (MLV) preintegration complex (PIC) early during infection, as determined by co-immunoprecipitation and mass spectrometry. RNAi-mediated silencing of DCTN2 profoundly reduced ecotropic MLV infection efficiency, establishing that DCTN2 is a required host factor for retrograde dynein-dependent transport of the MLV PIC toward the nucleus.","method":"FLAG-tagged integrase immunoprecipitation + mass spectrometry, RNAi knockdown with infection efficiency assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP/MS plus functional KD phenotype, single lab, two orthogonal methods","pmids":["27194765"],"is_preprint":false},{"year":2021,"finding":"Knockdown of DCTN2 (DCTN2-p50) in a Drosophila model of mitochondrial chaperone Hsc70-5 loss suppressed adult phenotypes including altered body posture and heat-induced paralysis, placing DCTN2 in the same pathway as dynactin-dynein function relevant to Parkinson's disease-related neurodegeneration.","method":"Genetic epistasis via RNAi knockdown in Drosophila; behavioral phenotype rescue assays","journal":"Autophagy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single genetic modifier screen in Drosophila model, phenotypic rescue without direct molecular mechanism for DCTN2 specifically","pmids":["33404278"],"is_preprint":false},{"year":2021,"finding":"Inhibition of DCTN2 and DCTN3 expression using shRNA-expressing lentiviruses inhibited intracellular transport of HSV-1 virion capsids toward the nucleus of human neuroblastoma cells, establishing that dynactin subunits including DCTN2 are required for dynein-mediated retrograde capsid transport during HSV-1 infection.","method":"shRNA lentiviral knockdown, capsid transport tracking by fluorescence microscopy in SK-N-SH cells","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown with defined transport phenotype, single lab, direct imaging readout","pmids":["33472938"],"is_preprint":false},{"year":2021,"finding":"DCTN2 is localized to centrosomes in colon cancer cells. ROCK1 physically binds DCTN2 as identified by immunoprecipitation and mass spectrometry. High glucose, insulin, and palmitic acid treatment increased ROCK1 and DCTN2 protein levels and promoted their binding, triggering centrosome amplification. Simultaneous siRNA knockdown of both ROCK1 and DCTN2 completely inhibited centrosome amplification, establishing DCTN2 as a centrosomal component whose interaction with ROCK1 mediates diabetes-associated centrosome amplification.","method":"Immunoprecipitation + mass spectrometry proteomics, immunofluorescence, siRNA knockdown of ROCK1 and/or DCTN2, centrosome counting","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP/MS with functional siRNA rescue, single lab, two orthogonal methods","pmids":["34080666"],"is_preprint":false},{"year":2022,"finding":"FER tyrosine kinase phosphorylates DCTN2 at tyrosine 6, identified using chemical genetics. DCTN2 tyrosine 6 phosphorylation is essential for the development of tubular recycling domains in early endosomes and for propagation of TNBC cell invasion in 3D culture.","method":"Chemical genetics to identify FER substrate, phosphorylation site mutagenesis (Y6), endosomal recycling assays, 3D invasion assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct substrate identification by chemical genetics with site-specific mutagenesis (Y6) and functional consequence in endosomal recycling and invasion assays; multiple orthogonal methods","pmids":["35385742"],"is_preprint":false},{"year":2022,"finding":"DCTN2 knockdown in hepatocellular carcinoma (HCC) cells (Huh7 and Hep3B) decreased proliferation, invasion, and migration, enhanced apoptosis, and reduced cell cycle progression through the G1/S phase by downregulating CDK4, Cyclin D1, and upregulating p21, establishing DCTN2 as a regulator of G1/S cell cycle progression.","method":"siRNA knockdown, Western blot for cell cycle proteins (CDK4, Cyclin D1, p21), cell proliferation/invasion/migration assays, apoptosis assay","journal":"Liver research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined molecular pathway readout (cell cycle proteins), single lab, multiple cellular assays","pmids":["39958200"],"is_preprint":false},{"year":2024,"finding":"DCTN2 knockdown in HCC cells inhibited AKT phosphorylation and downstream AKT pathway targets; rescue experiments with AKT pathway activation partially reversed the anti-tumor effects of DCTN2 knockdown, establishing that DCTN2 exerts tumor-promoting effects through modulation of the AKT signaling pathway.","method":"siRNA knockdown, Western blot for p-AKT and downstream targets, pharmacological AKT rescue experiments, proliferation and migration assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with pathway rescue experiment, single lab, mechanistic pathway placement via epistasis","pmids":["38842133"],"is_preprint":false},{"year":2018,"finding":"DCTN2 (dynamitin) co-localizes with phosphorylated alpha-synuclein (p-SNCA) in both brainstem-type and cortical Lewy bodies and Lewy neurites in Parkinson's disease and dementia with Lewy bodies brains, but not in multiple system atrophy inclusions, as shown by immunohistochemistry. This establishes that the dynactin complex (including DCTN2) is specifically incorporated into Lewy body pathology.","method":"Immunohistochemistry on autopsied human brains from PD, DLB, and MSA patients with anti-DCTN2 antibodies","journal":"Neuropathology","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — direct localization by IHC in human tissue, replicated across disease groups, but no functional mechanistic experiment beyond co-localization","pmids":["30215870"],"is_preprint":false},{"year":2025,"finding":"DCTN2 knockdown in glial cell lines resulted in increased cell toxicity and apoptosis. In Alzheimer's disease patient-derived fibroblasts, DCTN2 expression was differentially responsive to ER stress compared to controls, with DCTN2 fold change positively correlating with cognitive function and negatively with AD blood biomarkers.","method":"siRNA knockdown in glial cell lines with cell viability and apoptosis assays; bulk RNA sequencing of AD patient-derived fibroblasts","journal":"Psychiatry investigation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single knockdown experiment with cytotoxicity readout, no mechanistic pathway placement, single lab","pmids":["40566894"],"is_preprint":false}],"current_model":"DCTN2 (dynactin subunit 2/dynamitin/p50) is a structural subunit of the dynactin complex that, when overexpressed, disrupts dynein-dynactin motor function and impairs retrograde microtubule-dependent transport of diverse cargoes including autophagosomes, Golgi membranes, viral capsids, and preintegration complexes; it localizes to centrosomes where it is phosphorylated at tyrosine 6 by FER kinase to regulate endosomal recycling and cell invasion, and it interacts with ROCK1 to mediate centrosome amplification; additionally, DCTN2 promotes HCC cell cycle progression through G1/S via CDK4/Cyclin D1/p21 regulation and activates the AKT signaling pathway to drive tumor-promoting effects."},"narrative":{"mechanistic_narrative":"DCTN2 (dynactin subunit 2/dynamitin/p50) is a structural subunit of the dynactin complex whose function is central to dynein-mediated retrograde microtubule transport, and whose overexpression acts as a dominant-negative disruptor of the dynein-dynactin motor [PMID:16369996, PMID:23380587]. Genetic interference with dynein activity through DCTN2 overexpression blocks pericentrosomal clustering and trafficking of diverse cargoes, including autophagosomes during hypertonic and oxidative stress, where it abolishes dynein ATPase activation and autophagolysosome formation, as well as Golgi positioning and centrosome organization [PMID:16369996, PMID:23380587, PMID:24912985]. DCTN2 serves as a required host factor for retrograde transport of viral cargoes toward the nucleus, physically associating with the murine leukemia virus preintegration complex and supporting HSV-1 capsid transport [PMID:27194765, PMID:33472938]. At centrosomes, DCTN2 is regulated by phosphorylation: FER tyrosine kinase phosphorylates DCTN2 at tyrosine 6 to drive formation of tubular recycling domains in early endosomes and promote triple-negative breast cancer cell invasion [PMID:35385742], while its physical interaction with ROCK1 mediates metabolic stress-induced centrosome amplification [PMID:34080666]. In hepatocellular carcinoma, DCTN2 promotes G1/S cell cycle progression via CDK4/Cyclin D1/p21 and drives proliferation, invasion, and survival through activation of AKT signaling [PMID:39958200, PMID:38842133].","teleology":[{"year":2006,"claim":"Established that DCTN2 overexpression acts as a dominant-negative perturbant of the dynein-dynactin motor, linking its dosage to centrosome, Golgi, and mitotic defects in cancer cells.","evidence":"Genomic amplification (QFMPCR), Western blot, and immunofluorescence in SJSA-1 osteosarcoma cells","pmids":["16369996"],"confidence":"Medium","gaps":["Phenotypes derive from overexpression rather than loss of function","No direct structural mapping of which motor interactions are disrupted"]},{"year":2013,"claim":"Showed DCTN2 is required for microtubule-dependent autophagosome trafficking, connecting the dynein-dynactin complex to autophagic flux under stress.","evidence":"DCTN2 overexpression as genetic dynein inhibition with LC3/ATG12 imaging and flux assays under hypertonic stress","pmids":["23380587"],"confidence":"Medium","gaps":["Relies on overexpression-based dynein inhibition","Does not define how DCTN2 couples autophagosomes to dynein"]},{"year":2014,"claim":"Tied DCTN2 disruption to loss of dynein ATPase activation, providing an enzymatic readout for impaired motor function during autophagosome transport.","evidence":"DCTN2 overexpression with dynein ATPase assay and live-cell autophagosome tracking in primary coronary arterial myocytes","pmids":["24912985"],"confidence":"Medium","gaps":["Overexpression rather than endogenous perturbation","Mechanistic link between DCTN2 and ATPase regulation not resolved at molecular level"]},{"year":2016,"claim":"Identified DCTN2 as a required host factor that associates with the MLV preintegration complex for retrograde transport toward the nucleus.","evidence":"FLAG-integrase co-IP/mass spectrometry plus RNAi knockdown infection assay","pmids":["27194765"],"confidence":"Medium","gaps":["Direct versus indirect binding to the PIC not distinguished","Does not address whether the interaction is via assembled dynactin"]},{"year":2021,"claim":"Generalized DCTN2's role in dynein-dependent viral transport to HSV-1 capsid movement and placed it in a dynein-dynactin neurodegeneration pathway.","evidence":"shRNA knockdown with capsid transport imaging in SK-N-SH cells; RNAi epistasis in a Drosophila Hsc70-5 loss model","pmids":["33472938","33404278"],"confidence":"Medium","gaps":["Drosophila modifier evidence is genetic without DCTN2-specific molecular mechanism","Whether transport defects are direct consequences of dynactin disruption not isolated"]},{"year":2021,"claim":"Defined a centrosomal pool of DCTN2 that binds ROCK1 to drive metabolic stress-induced centrosome amplification.","evidence":"Co-IP/mass spectrometry, immunofluorescence, and combined siRNA knockdown with centrosome counting in colon cancer cells","pmids":["34080666"],"confidence":"Medium","gaps":["Direct versus dynactin-mediated DCTN2-ROCK1 interaction unresolved","Mechanism connecting the interaction to centriole duplication not defined"]},{"year":2022,"claim":"Identified DCTN2 as a direct FER kinase substrate phosphorylated at tyrosine 6, linking this modification to endosomal recycling architecture and tumor cell invasion.","evidence":"Chemical-genetic substrate identification, Y6 phosphosite mutagenesis, endosomal recycling and 3D invasion assays in TNBC","pmids":["35385742"],"confidence":"High","gaps":["How Y6 phosphorylation alters dynactin assembly or dynein engagement is unspecified","Structural consequence of the modification not determined"]},{"year":2022,"claim":"Placed DCTN2 as a positive regulator of G1/S transition through CDK4/Cyclin D1/p21 in hepatocellular carcinoma.","evidence":"siRNA knockdown with cell cycle protein Westerns and proliferation/invasion/apoptosis assays in Huh7 and Hep3B","pmids":["39958200"],"confidence":"Medium","gaps":["Whether cell cycle effects depend on dynactin transport function is unknown","Direct targets linking DCTN2 to CDK4/Cyclin D1 not identified"]},{"year":2024,"claim":"Connected DCTN2's tumor-promoting activity to AKT pathway activation via epistatic rescue.","evidence":"siRNA knockdown with p-AKT Westerns and pharmacological AKT rescue in HCC cells","pmids":["38842133"],"confidence":"Medium","gaps":["Mechanism by which DCTN2 modulates AKT phosphorylation not defined","Direct molecular link between dynactin function and AKT signaling missing"]},{"year":2025,"claim":"Implicated DCTN2 in glial cell survival and stress responsiveness relevant to neurodegeneration.","evidence":"siRNA knockdown with viability/apoptosis assays in glial lines; bulk RNA-seq of AD patient fibroblasts","pmids":["40566894"],"confidence":"Low","gaps":["Single knockdown experiment without mechanistic pathway placement","Correlative biomarker associations do not establish causality"]},{"year":null,"claim":"How DCTN2 phosphorylation, ROCK1 binding, and downstream signaling (AKT, cell cycle) are mechanistically integrated with its core dynactin/dynein transport role remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of how DCTN2 modifications alter dynactin assembly","Whether signaling and cell cycle roles are separable from motor transport function is unknown","No reconstituted system linking DCTN2 to dynein motility under these conditions"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,6]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3,5]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,8]}],"complexes":["dynactin"],"partners":["DCTN3","ROCK1","FER"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13561","full_name":"Dynactin subunit 2","aliases":["50 kDa dynein-associated polypeptide","Dynactin complex 50 kDa subunit","DCTN-50","p50 dynamitin"],"length_aa":401,"mass_kda":44.2,"function":"Part of the dynactin complex that activates the molecular motor dynein for ultra-processive transport along microtubules. In the dynactin soulder domain, binds the ACTR1A filament and acts as a molecular ruler to determine the length (By similarity). Modulates cytoplasmic dynein binding to an organelle, and plays a role in prometaphase chromosome alignment and spindle organization during mitosis. Involved in anchoring microtubules to centrosomes. May play a role in synapse formation during brain development (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Membrane; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q13561/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DCTN2","classification":"Common Essential","n_dependent_lines":1128,"n_total_lines":1208,"dependency_fraction":0.9337748344370861},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000175203","cell_line_id":"CID001777","localizations":[{"compartment":"centrosome","grade":3},{"compartment":"cytoplasmic","grade":3},{"compartment":"cytoskeleton","grade":2}],"interactors":[{"gene":"CAPZB","stoichiometry":10.0},{"gene":"DCTN3","stoichiometry":10.0},{"gene":"DCTN1;DKFZP686E0752","stoichiometry":10.0},{"gene":"DYNC1LI1","stoichiometry":10.0},{"gene":"DYNC1H1","stoichiometry":10.0},{"gene":"ACTR1A","stoichiometry":10.0},{"gene":"DYNC1I2","stoichiometry":10.0},{"gene":"MAPRE1","stoichiometry":10.0},{"gene":"CLASP1","stoichiometry":4.0},{"gene":"ACTR1B","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001777","total_profiled":1310},"omim":[{"mim_id":"619421","title":"DYNACTIN-ASSOCIATED PROTEIN; DYNAP","url":"https://www.omim.org/entry/619421"},{"mim_id":"617076","title":"FK506-BINDING PROTEIN-LIKE; FKBPL","url":"https://www.omim.org/entry/617076"},{"mim_id":"607376","title":"DYNACTIN 2; DCTN2","url":"https://www.omim.org/entry/607376"},{"mim_id":"603108","title":"MICROTUBULE-ASSOCIATED PROTEIN, RP/EB FAMILY, MEMBER 1; MAPRE1","url":"https://www.omim.org/entry/603108"},{"mim_id":"601143","title":"DYNACTIN 1; DCTN1","url":"https://www.omim.org/entry/601143"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Basal body","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"},{"location":"Connecting piece","reliability":"Additional"},{"location":"Mid piece","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"},{"location":"End piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DCTN2"},"hgnc":{"alias_symbol":["RBP50","DCTN-50"],"prev_symbol":[]},"alphafold":{"accession":"Q13561","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13561","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13561-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13561-F1-predicted_aligned_error_v6.png","plddt_mean":76.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DCTN2","jax_strain_url":"https://www.jax.org/strain/search?query=DCTN2"},"sequence":{"accession":"Q13561","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13561.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13561/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13561"}},"corpus_meta":[{"pmid":"19122103","id":"PMC_19122103","title":"A polypyrimidine tract binding protein, pumpkin RBP50, forms the basis of a phloem-mobile ribonucleoprotein 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/39747444","citation_count":2,"is_preprint":false},{"pmid":"40566894","id":"PMC_40566894","title":"Transcriptional Landscape and Biomarker Discovery for Endoplasmic Reticulum Stress in Alzheimer's Disease: An Ex Vivo Study Using Patients-Derived Dermal Fibroblasts.","date":"2025","source":"Psychiatry investigation","url":"https://pubmed.ncbi.nlm.nih.gov/40566894","citation_count":2,"is_preprint":false},{"pmid":"38773124","id":"PMC_38773124","title":"Neither alpha-synuclein fibril strain nor host murine genotype influences seeding efficacy.","date":"2024","source":"NPJ Parkinson's disease","url":"https://pubmed.ncbi.nlm.nih.gov/38773124","citation_count":1,"is_preprint":false},{"pmid":"37662402","id":"PMC_37662402","title":"Neither alpha-synuclein-preformed fibrils derived from patients with GBA1 mutations nor the host murine genotype significantly influence seeding efficacy in the mouse olfactory bulb.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/37662402","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19052,"output_tokens":3190,"usd":0.052503,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10712,"output_tokens":3277,"usd":0.067742,"stage2_stop_reason":"end_turn"},"total_usd":0.120245,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"DCTN2 (dynactin-2/dynamitin) overexpression disrupts the dynein-dynactin motor complex, causing alterations in microtubule-directed movement of molecular cargoes (e.g., TP53) and organelles (e.g., Golgi), centrosome biology, cellular movement, and mitosis, with predisposition to mitotic block and polyploidy. In SJSA-1 osteosarcoma cells with genomic DCTN2 amplification and sustained overexpression, diminished centrosome and Golgi marker focus was observed by immunofluorescence microscopy.\",\n      \"method\": \"QFMPCR for genomic amplification, Western blot, immunofluorescence microscopy, overexpression studies in cancer cell lines\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression with defined cellular phenotypes (Golgi, centrosome) using multiple orthogonal methods in a single lab; mechanistic link to dynein-dynactin disruption supported by prior transient overexpression literature cited in the abstract\",\n      \"pmids\": [\"16369996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Overexpression of DCTN2 (dynamitin/p50) interferes with dynein activity, blocking autophagosome clustering at the pericentrosomal region during hypertonic stress. Genetic interference of dynein activity via DCTN2 overexpression reduced autophagosome trafficking and autophagic flux, demonstrating that DCTN2 functions as part of the dynein-dynactin complex required for microtubule-dependent autophagosome transport.\",\n      \"method\": \"DCTN2 overexpression (genetic dynein inhibition), LC3/ATG12 immunofluorescence, autophagy flux assays in cells under hypertonic stress\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic overexpression with defined autophagy phenotype, single lab, multiple fluorescent markers\",\n      \"pmids\": [\"23380587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DCTN2 (dynamitin) overexpression disrupts the dynein complex and blocks ROS-induced dynein ATPase activation, autophagosome movement, and autophagolysosome formation in coronary arterial myocytes (CAMs), establishing DCTN2 as a structural component whose disruption abolishes dynein-mediated autophagosome trafficking.\",\n      \"method\": \"DCTN2 overexpression, dynein ATPase activity assay, live-cell autophagosome movement tracking, autophagolysosome formation assay in primary CAMs\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression with enzymatic (ATPase) and cell biological readouts, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"24912985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DCTN2/p50/dynamitin interacts with the murine leukemia virus (MLV) preintegration complex (PIC) early during infection, as determined by co-immunoprecipitation and mass spectrometry. RNAi-mediated silencing of DCTN2 profoundly reduced ecotropic MLV infection efficiency, establishing that DCTN2 is a required host factor for retrograde dynein-dependent transport of the MLV PIC toward the nucleus.\",\n      \"method\": \"FLAG-tagged integrase immunoprecipitation + mass spectrometry, RNAi knockdown with infection efficiency assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP/MS plus functional KD phenotype, single lab, two orthogonal methods\",\n      \"pmids\": [\"27194765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Knockdown of DCTN2 (DCTN2-p50) in a Drosophila model of mitochondrial chaperone Hsc70-5 loss suppressed adult phenotypes including altered body posture and heat-induced paralysis, placing DCTN2 in the same pathway as dynactin-dynein function relevant to Parkinson's disease-related neurodegeneration.\",\n      \"method\": \"Genetic epistasis via RNAi knockdown in Drosophila; behavioral phenotype rescue assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single genetic modifier screen in Drosophila model, phenotypic rescue without direct molecular mechanism for DCTN2 specifically\",\n      \"pmids\": [\"33404278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Inhibition of DCTN2 and DCTN3 expression using shRNA-expressing lentiviruses inhibited intracellular transport of HSV-1 virion capsids toward the nucleus of human neuroblastoma cells, establishing that dynactin subunits including DCTN2 are required for dynein-mediated retrograde capsid transport during HSV-1 infection.\",\n      \"method\": \"shRNA lentiviral knockdown, capsid transport tracking by fluorescence microscopy in SK-N-SH cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown with defined transport phenotype, single lab, direct imaging readout\",\n      \"pmids\": [\"33472938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DCTN2 is localized to centrosomes in colon cancer cells. ROCK1 physically binds DCTN2 as identified by immunoprecipitation and mass spectrometry. High glucose, insulin, and palmitic acid treatment increased ROCK1 and DCTN2 protein levels and promoted their binding, triggering centrosome amplification. Simultaneous siRNA knockdown of both ROCK1 and DCTN2 completely inhibited centrosome amplification, establishing DCTN2 as a centrosomal component whose interaction with ROCK1 mediates diabetes-associated centrosome amplification.\",\n      \"method\": \"Immunoprecipitation + mass spectrometry proteomics, immunofluorescence, siRNA knockdown of ROCK1 and/or DCTN2, centrosome counting\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP/MS with functional siRNA rescue, single lab, two orthogonal methods\",\n      \"pmids\": [\"34080666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FER tyrosine kinase phosphorylates DCTN2 at tyrosine 6, identified using chemical genetics. DCTN2 tyrosine 6 phosphorylation is essential for the development of tubular recycling domains in early endosomes and for propagation of TNBC cell invasion in 3D culture.\",\n      \"method\": \"Chemical genetics to identify FER substrate, phosphorylation site mutagenesis (Y6), endosomal recycling assays, 3D invasion assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct substrate identification by chemical genetics with site-specific mutagenesis (Y6) and functional consequence in endosomal recycling and invasion assays; multiple orthogonal methods\",\n      \"pmids\": [\"35385742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DCTN2 knockdown in hepatocellular carcinoma (HCC) cells (Huh7 and Hep3B) decreased proliferation, invasion, and migration, enhanced apoptosis, and reduced cell cycle progression through the G1/S phase by downregulating CDK4, Cyclin D1, and upregulating p21, establishing DCTN2 as a regulator of G1/S cell cycle progression.\",\n      \"method\": \"siRNA knockdown, Western blot for cell cycle proteins (CDK4, Cyclin D1, p21), cell proliferation/invasion/migration assays, apoptosis assay\",\n      \"journal\": \"Liver research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined molecular pathway readout (cell cycle proteins), single lab, multiple cellular assays\",\n      \"pmids\": [\"39958200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DCTN2 knockdown in HCC cells inhibited AKT phosphorylation and downstream AKT pathway targets; rescue experiments with AKT pathway activation partially reversed the anti-tumor effects of DCTN2 knockdown, establishing that DCTN2 exerts tumor-promoting effects through modulation of the AKT signaling pathway.\",\n      \"method\": \"siRNA knockdown, Western blot for p-AKT and downstream targets, pharmacological AKT rescue experiments, proliferation and migration assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with pathway rescue experiment, single lab, mechanistic pathway placement via epistasis\",\n      \"pmids\": [\"38842133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DCTN2 (dynamitin) co-localizes with phosphorylated alpha-synuclein (p-SNCA) in both brainstem-type and cortical Lewy bodies and Lewy neurites in Parkinson's disease and dementia with Lewy bodies brains, but not in multiple system atrophy inclusions, as shown by immunohistochemistry. This establishes that the dynactin complex (including DCTN2) is specifically incorporated into Lewy body pathology.\",\n      \"method\": \"Immunohistochemistry on autopsied human brains from PD, DLB, and MSA patients with anti-DCTN2 antibodies\",\n      \"journal\": \"Neuropathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by IHC in human tissue, replicated across disease groups, but no functional mechanistic experiment beyond co-localization\",\n      \"pmids\": [\"30215870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DCTN2 knockdown in glial cell lines resulted in increased cell toxicity and apoptosis. In Alzheimer's disease patient-derived fibroblasts, DCTN2 expression was differentially responsive to ER stress compared to controls, with DCTN2 fold change positively correlating with cognitive function and negatively with AD blood biomarkers.\",\n      \"method\": \"siRNA knockdown in glial cell lines with cell viability and apoptosis assays; bulk RNA sequencing of AD patient-derived fibroblasts\",\n      \"journal\": \"Psychiatry investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single knockdown experiment with cytotoxicity readout, no mechanistic pathway placement, single lab\",\n      \"pmids\": [\"40566894\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DCTN2 (dynactin subunit 2/dynamitin/p50) is a structural subunit of the dynactin complex that, when overexpressed, disrupts dynein-dynactin motor function and impairs retrograde microtubule-dependent transport of diverse cargoes including autophagosomes, Golgi membranes, viral capsids, and preintegration complexes; it localizes to centrosomes where it is phosphorylated at tyrosine 6 by FER kinase to regulate endosomal recycling and cell invasion, and it interacts with ROCK1 to mediate centrosome amplification; additionally, DCTN2 promotes HCC cell cycle progression through G1/S via CDK4/Cyclin D1/p21 regulation and activates the AKT signaling pathway to drive tumor-promoting effects.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DCTN2 (dynactin subunit 2/dynamitin/p50) is a structural subunit of the dynactin complex whose function is central to dynein-mediated retrograde microtubule transport, and whose overexpression acts as a dominant-negative disruptor of the dynein-dynactin motor [#0, #1]. Genetic interference with dynein activity through DCTN2 overexpression blocks pericentrosomal clustering and trafficking of diverse cargoes, including autophagosomes during hypertonic and oxidative stress, where it abolishes dynein ATPase activation and autophagolysosome formation, as well as Golgi positioning and centrosome organization [#0, #1, #2]. DCTN2 serves as a required host factor for retrograde transport of viral cargoes toward the nucleus, physically associating with the murine leukemia virus preintegration complex and supporting HSV-1 capsid transport [#3, #5]. At centrosomes, DCTN2 is regulated by phosphorylation: FER tyrosine kinase phosphorylates DCTN2 at tyrosine 6 to drive formation of tubular recycling domains in early endosomes and promote triple-negative breast cancer cell invasion [#7], while its physical interaction with ROCK1 mediates metabolic stress-induced centrosome amplification [#6]. In hepatocellular carcinoma, DCTN2 promotes G1/S cell cycle progression via CDK4/Cyclin D1/p21 and drives proliferation, invasion, and survival through activation of AKT signaling [#8, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that DCTN2 overexpression acts as a dominant-negative perturbant of the dynein-dynactin motor, linking its dosage to centrosome, Golgi, and mitotic defects in cancer cells.\",\n      \"evidence\": \"Genomic amplification (QFMPCR), Western blot, and immunofluorescence in SJSA-1 osteosarcoma cells\",\n      \"pmids\": [\"16369996\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phenotypes derive from overexpression rather than loss of function\", \"No direct structural mapping of which motor interactions are disrupted\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed DCTN2 is required for microtubule-dependent autophagosome trafficking, connecting the dynein-dynactin complex to autophagic flux under stress.\",\n      \"evidence\": \"DCTN2 overexpression as genetic dynein inhibition with LC3/ATG12 imaging and flux assays under hypertonic stress\",\n      \"pmids\": [\"23380587\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relies on overexpression-based dynein inhibition\", \"Does not define how DCTN2 couples autophagosomes to dynein\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Tied DCTN2 disruption to loss of dynein ATPase activation, providing an enzymatic readout for impaired motor function during autophagosome transport.\",\n      \"evidence\": \"DCTN2 overexpression with dynein ATPase assay and live-cell autophagosome tracking in primary coronary arterial myocytes\",\n      \"pmids\": [\"24912985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression rather than endogenous perturbation\", \"Mechanistic link between DCTN2 and ATPase regulation not resolved at molecular level\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified DCTN2 as a required host factor that associates with the MLV preintegration complex for retrograde transport toward the nucleus.\",\n      \"evidence\": \"FLAG-integrase co-IP/mass spectrometry plus RNAi knockdown infection assay\",\n      \"pmids\": [\"27194765\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect binding to the PIC not distinguished\", \"Does not address whether the interaction is via assembled dynactin\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Generalized DCTN2's role in dynein-dependent viral transport to HSV-1 capsid movement and placed it in a dynein-dynactin neurodegeneration pathway.\",\n      \"evidence\": \"shRNA knockdown with capsid transport imaging in SK-N-SH cells; RNAi epistasis in a Drosophila Hsc70-5 loss model\",\n      \"pmids\": [\"33472938\", \"33404278\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Drosophila modifier evidence is genetic without DCTN2-specific molecular mechanism\", \"Whether transport defects are direct consequences of dynactin disruption not isolated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined a centrosomal pool of DCTN2 that binds ROCK1 to drive metabolic stress-induced centrosome amplification.\",\n      \"evidence\": \"Co-IP/mass spectrometry, immunofluorescence, and combined siRNA knockdown with centrosome counting in colon cancer cells\",\n      \"pmids\": [\"34080666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus dynactin-mediated DCTN2-ROCK1 interaction unresolved\", \"Mechanism connecting the interaction to centriole duplication not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified DCTN2 as a direct FER kinase substrate phosphorylated at tyrosine 6, linking this modification to endosomal recycling architecture and tumor cell invasion.\",\n      \"evidence\": \"Chemical-genetic substrate identification, Y6 phosphosite mutagenesis, endosomal recycling and 3D invasion assays in TNBC\",\n      \"pmids\": [\"35385742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Y6 phosphorylation alters dynactin assembly or dynein engagement is unspecified\", \"Structural consequence of the modification not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed DCTN2 as a positive regulator of G1/S transition through CDK4/Cyclin D1/p21 in hepatocellular carcinoma.\",\n      \"evidence\": \"siRNA knockdown with cell cycle protein Westerns and proliferation/invasion/apoptosis assays in Huh7 and Hep3B\",\n      \"pmids\": [\"39958200\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether cell cycle effects depend on dynactin transport function is unknown\", \"Direct targets linking DCTN2 to CDK4/Cyclin D1 not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected DCTN2's tumor-promoting activity to AKT pathway activation via epistatic rescue.\",\n      \"evidence\": \"siRNA knockdown with p-AKT Westerns and pharmacological AKT rescue in HCC cells\",\n      \"pmids\": [\"38842133\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which DCTN2 modulates AKT phosphorylation not defined\", \"Direct molecular link between dynactin function and AKT signaling missing\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated DCTN2 in glial cell survival and stress responsiveness relevant to neurodegeneration.\",\n      \"evidence\": \"siRNA knockdown with viability/apoptosis assays in glial lines; bulk RNA-seq of AD patient fibroblasts\",\n      \"pmids\": [\"40566894\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single knockdown experiment without mechanistic pathway placement\", \"Correlative biomarker associations do not establish causality\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DCTN2 phosphorylation, ROCK1 binding, and downstream signaling (AKT, cell cycle) are mechanistically integrated with its core dynactin/dynein transport role remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of how DCTN2 modifications alter dynactin assembly\", \"Whether signaling and cell cycle roles are separable from motor transport function is unknown\", \"No reconstituted system linking DCTN2 to dynein motility under these conditions\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 8]}\n    ],\n    \"complexes\": [\"dynactin\"],\n    \"partners\": [\"DCTN3\", \"ROCK1\", \"FER\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}