{"gene":"NUDC","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1998,"finding":"Mammalian NudC physically interacts with Lis1 (the lissencephaly gene product), demonstrated by yeast two-hybrid screen, in vitro protein-protein interaction assays, and co-immunoprecipitation from mouse brain extracts.","method":"Yeast two-hybrid screen, in vitro pulldown assay, co-immunoprecipitation from mouse brain extracts","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP from brain tissue plus in vitro binding plus yeast two-hybrid; multiple orthogonal methods in one study","pmids":["9601647"],"is_preprint":false},{"year":2001,"finding":"NudC, Lis1, and cytoplasmic dynein intermediate chain (CDIC) colocalize at the MTOC at the leading pole of migrating cerebellar granule neurons; NudC co-immunoprecipitates with CDIC and cytoplasmic dynein heavy chain (CDHC) from mouse brain extracts, placing NudC in the dynein motor complex during neuronal migration.","method":"Immunofluorescence co-localization, co-immunoprecipitation from mouse brain extracts","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP from tissue plus direct localization in neurons; multiple orthogonal methods, replicated interaction with prior yeast two-hybrid data","pmids":["11734602"],"is_preprint":false},{"year":2003,"finding":"NudC plays roles in mitosis and cytokinesis; siRNA knockdown or adenoviral overexpression causes multinucleated cells, persistent intercellular connections, and disorganized midzone/midbody matrix. Polo-like kinase 1 (Plk1) is mislocalized from centrosomes and midbody when NudC levels are altered. In C. elegans, silencing of nud-1 (NudC ortholog) causes loss of midzone microtubules and cleavage furrow regression.","method":"siRNA knockdown, adenovirus-mediated overexpression, immunofluorescence microscopy, RNAi in C. elegans","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and gain-of-function with specific cellular phenotypes, validated in two independent model systems (mammalian cells and C. elegans)","pmids":["12679384"],"is_preprint":false},{"year":2003,"finding":"NudC was identified as a Plk1 binding protein via cDNA phage display; Plk1 phosphorylates NudC at conserved S274 and S326 residues in vitro and in vivo. Rescue of NudC RNAi-induced cytokinesis defects (multinucleation, midbody arrest) requires wild-type NudC but not the S274A/S326A phosphorylation site mutant, establishing that Plk1 phosphorylation of NudC is functionally required for cytokinesis.","method":"cDNA phage display, in vitro kinase assay, in vivo phosphorylation assay, siRNA knockdown with rescue using phosphorylation-site mutants","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay plus mutagenesis rescue in cells; multiple orthogonal approaches in one study","pmids":["12852857"],"is_preprint":false},{"year":2006,"finding":"NudC is required for Plk1 targeting to kinetochores and chromosome congression. Plk1-phosphorylated NudC colocalizes with Plk1 at the outer kinetochore plate. NudC depletion reduces end-on microtubule attachments at kinetochores and mislocalizes Plk1 and CENP-E from prometaphase kinetochores. Rescue requires wild-type NudC but not the Plk1 phosphorylation-site mutant, establishing NudC as both substrate and spatial regulator of Plk1 at the kinetochore.","method":"siRNA knockdown, immunofluorescence microscopy, rescue with phosphorylation-site mutants","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — KD with specific kinetochore phenotype plus phospho-mutant rescue; multiple readouts in one study","pmids":["16860740"],"is_preprint":false},{"year":2010,"finding":"NudC functions as an Hsp90 co-chaperone to stabilize LIS1: NudC binds Hsp90, regulates Hsp90 ATPase activity, and possesses intrinsic chaperone activity. The L279P mutation (equivalent to the Aspergillus L146P temperature-sensitive mutation) impairs NudC chaperone function, reduces LIS1 protein levels, and causes LIS1-depletion-like cellular phenotypes. Hsp90 inhibition (geldanamycin/radicicol) decreases LIS1; ectopic Hsp90 partially rescues LIS1 degradation caused by NudC-L279P.","method":"Site-directed mutagenesis, ATPase activity assay, immunoprecipitation, pharmacological Hsp90 inhibition, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ATPase assay plus mutagenesis plus pharmacological inhibition, multiple orthogonal methods in one study, single lab","pmids":["20675372"],"is_preprint":false},{"year":2011,"finding":"Crystal structure and NMR analysis show human NudC contains a CS domain (characteristic of Hsp90 co-chaperones and small heat shock proteins) and dimerizes via an N-terminal coiled coil. NudC (and NudCL, but not NudCL2) inhibits aggregation of several target proteins in chaperone assays consistent with Hsp90-independent heat shock protein function. However, none of the three NudC paralogs formed binary complexes with Lis1 in these assays.","method":"X-ray crystallography, NMR, in vitro aggregation assay","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus NMR plus functional in vitro chaperone assay; multiple rigorous methods, single lab","pmids":["21530541"],"is_preprint":false},{"year":2011,"finding":"NudC is required for interkinetic nuclear migration in radial glial progenitors and for neuronal migration during neocorticogenesis in rat embryo, demonstrated by in utero electroporation of shRNAs and dominant-negative/wild-type NudC constructs.","method":"In utero electroporation, shRNA knockdown, overexpression of mutant forms in embryonic rat brain","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function and rescue in rat brain with specific migration phenotype; single lab with multiple constructs","pmids":["21771589"],"is_preprint":false},{"year":2013,"finding":"NudC is deacetylated during mitosis; K39 is an acetylation site on NudC. The acetylation-mimetic K39Q mutant fails to rescue mitotic phenotypes (chromosome misalignment, missegregation, reduced spindle width) caused by NudC knockdown, while the acetylation-defective K39R mutant rescues these defects. NudC co-localizes and co-immunoprecipitates with HDAC3 on the mitotic spindle; HDAC3 knockdown or inhibition increases NudC acetylation, identifying HDAC3 as a deacetylase for NudC.","method":"Mass spectrometry identification of acetylation site, site-directed mutagenesis with rescue assay, co-immunoprecipitation, pharmacological HDAC3 inhibition","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — MS identification of modification site, mutagenesis rescue, co-IP of writer enzyme; multiple orthogonal methods in one study","pmids":["24069238"],"is_preprint":false},{"year":2015,"finding":"NudC binds to and stabilizes cofilin 1 (an actin dynamics regulator), thereby regulating actin organization and ciliogenesis. NudC depletion causes similar ciliary defects as cofilin 1 depletion (cilia elongation, increased ciliated cells, zebrafish curved body/pericardial edema/laterality defects). Ectopic cofilin 1 expression significantly reverses NudC depletion phenotypes, placing cofilin 1 downstream of NudC.","method":"Co-immunoprecipitation, siRNA knockdown, rescue experiments, zebrafish morpholino knockdown with phenotypic analysis","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP plus epistasis rescue in cells and in vivo (zebrafish); multiple orthogonal methods and two model systems","pmids":["26704451"],"is_preprint":false},{"year":2015,"finding":"EML4 directly interacts with NudC (interaction mediated by EML4's WD40 repeat and the C-terminus of NudC) and is required for loading NudC onto the mitotic spindle. In EML4-depleted cells, NudC fails to localize to the mitotic spindle, while NudC depletion does not affect EML4 localization.","method":"Mass spectrometry interactome screen, co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS discovery plus co-IP plus localization phenotype; single lab, multiple methods","pmids":["25789526"],"is_preprint":false},{"year":2016,"finding":"Aurora B phosphorylates NudC at T40; NudC co-localizes and co-immunoprecipitates with Aurora B at the midbody during mitosis. Aurora B inhibition (ZM447439) reduces NudC phosphorylation in vivo. The T40D phospho-mimetic NudC fails to rescue cytokinesis defects (intercellular bridge elongation, sustained Aurora B activity, reduced abscission) caused by NudC depletion, while T40A rescues them, indicating that dynamic dephosphorylation at T40 is required for cytokinesis completion.","method":"In vivo kinase inhibition, site-directed mutagenesis with rescue assay, co-immunoprecipitation, immunofluorescence microscopy","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — phosphorylation-site mutagenesis rescue plus pharmacological kinase inhibition plus co-IP; multiple orthogonal methods in one study","pmids":["27074040"],"is_preprint":false},{"year":2019,"finding":"NudC interacts with rhodopsin and the small GTPase Rab11a in rod photoreceptors. NudC is required for disk formation and photoreceptor protein localization in rod outer segments, as demonstrated by transgenic tadpole studies with NudC shRNA knockdown and rescue with murine NudC.","method":"Co-immunoprecipitation, shRNA knockdown in transgenic tadpoles, rescue experiments","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP for binding partners plus in vivo knockdown/rescue in tadpole photoreceptors; single lab","pmids":["31022349"],"is_preprint":false},{"year":2021,"finding":"NudC (as an Hsp90 co-chaperone) is required to stabilize filamin A; NudC interacts with filamin A (identified by IP-mass spectrometry). The chaperone-defective NudC-L279P mutant decreases filamin A protein levels, causes actin disorganization, and suppresses cell migration. Ectopic filamin A or Hsp90 reverses these defects, placing filamin A as an Hsp90/NudC client required for cell migration.","method":"Immunoprecipitation-mass spectrometry, Western blot, overexpression of NudC-L279P mutant, rescue with filamin A or Hsp90, pharmacological Hsp90 inhibition","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS plus mutagenesis plus pharmacological rescue; single lab, multiple methods","pmids":["34262899"],"is_preprint":false},{"year":2022,"finding":"NudC acts as an essential transfer factor between the Hsp40/70 and Hsp90 chaperone systems: NudC interacts with Hsp40 within Hsp40-Hsp70-client complexes and displaces Hsp70; NudC then interacts with Hsp90, enabling direct transfer of Hsp40-bound clients to Hsp90 for further processing. NudC increases client activation in vitro and in cells and is essential for cellular viability.","method":"Biochemical reconstitution, co-immunoprecipitation, in vitro client activation assay, genetic depletion","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted transfer mechanism in vitro plus validated in cells; multiple orthogonal methods in one rigorous study","pmids":["35063133"],"is_preprint":false},{"year":2022,"finding":"In zebrafish axon terminals, NudC acts as a chaperone for Lis1; loss of NudC function reduces Lis1 levels, causing dynein/dynactin accumulation and increased microtubule stability. Pharmacological dynein inhibition restores microtubule dynamics in nudc mutant axon terminals, placing excess dynein motor activity downstream of NudC/Lis1 depletion in microtubule regulation.","method":"Forward genetic screen, immunofluorescence, pharmacological dynein inhibition, Western blot in zebrafish","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — forward genetic screen plus epistasis with pharmacological rescue; multiple methods in one study","pmids":["36147950"],"is_preprint":false},{"year":2024,"finding":"Conditional knockout of NudC in mouse rod photoreceptors causes rhodopsin and mitochondria mislocalization (consistent with dynein inhibition), increased phosphorylated cofilin 1 (implicating NudC in cofilin 1-mediated actin depolymerization), ultrastructural outer segment defects, and rapid photoreceptor cell death by 6 weeks. LIS1 levels were unaffected, indicating a LIS1-independent role of NudC in rods.","method":"Conditional CRISPR/Cas9 knockout in mouse rods, electroretinography, immunofluorescence, transmission electron microscopy, Western blot","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with multiple functional and ultrastructural readouts; single lab but multiple orthogonal methods","pmids":["38441532"],"is_preprint":false},{"year":2007,"finding":"Mouse NudC interacts with the regulatory beta subunit of platelet-activating factor acetylhydrolase I (PAF-AH(I)) and increases PAF-AH(I) catalytic activity; this regulatory activity maps to the conserved C-terminal half of NudC.","method":"Co-immunoprecipitation, PAF-AH(I) enzymatic activity assay with NudC deletion constructs","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus enzymatic activity assay with domain mapping; single lab","pmids":["17555748"],"is_preprint":false},{"year":2025,"finding":"RNF41 (an E3 ubiquitin ligase) directly interacts with NudC, ubiquitinates NudC, and promotes its proteasomal degradation. Loss of RNF41 increases NudC stability, which enhances β-tubulin polymerization and promotes bladder cancer cell migration and invasion.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown and overexpression, Western blot, in vitro migration assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus ubiquitination assay with functional rescue; single lab","pmids":["40494872"],"is_preprint":false},{"year":1997,"finding":"Rat NudC (c15/RnudC) functionally complements the Aspergillus nudC3 nuclear migration mutant and restores NudF protein levels, demonstrating functional conservation of the nuclear migration role and indicating that NudC acts upstream of NudF (Lis1 ortholog) in the nuclear distribution pathway.","method":"Functional complementation in Aspergillus nidulans nudC3 temperature-sensitive mutant","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct functional complementation assay with pathway epistasis; single study but clean genetic readout","pmids":["9013770"],"is_preprint":false},{"year":2010,"finding":"Human NudC binds to the thrombopoietin receptor (Mpl) extracellular domain 1, specifically residues 206–251; two hydrophobic residues Leu228 and Leu230 are critical for hNUDC binding (identified by alanine replacement mutagenesis), and the WGSWS motif is required for hNUDC but not TPO binding.","method":"Yeast two-hybrid, co-immunoprecipitation, T7 phage display, ELISA binding assays, alanine scanning mutagenesis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays plus mutagenesis to identify critical residues; single lab","pmids":["20529857"],"is_preprint":false},{"year":2020,"finding":"NAGK (N-acetylglucosamine kinase) interacts with NudC and Lis1 in the dynein complex; NAGK-NudC-Lis1-dynein complexes are detected around nuclei and at leading poles of migrating cells. NAGK overexpression accelerates cell migration while NAGK knockdown delays it; a NAGK peptide from the NudC-interacting domain retards migration, placing the NAGK-NudC-Lis1-dynein complex at the nuclear envelope as a regulator of cell migration.","method":"Yeast two-hybrid, pulldown assay, immunocytochemistry, proximity ligation assay, wound healing assay, in utero electroporation, shRNA knockdown","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays plus in vivo functional assays; single lab","pmids":["33374456"],"is_preprint":false},{"year":2026,"finding":"In Drosophila polyploid salivary gland cells, NudC depletion reduces ribosome abundance, impairs translation, decreases ribosomal RNA levels, and triggers a homeostatic transcriptional/translational upregulation of ribosome biogenesis factors. This role in ribosome biogenesis is independent of NudC's established function in dynein regulation.","method":"RNAi knockdown in Drosophila salivary glands, ribosome profiling, RNA quantification, immunofluorescence","journal":"Open biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi loss-of-function with multiple molecular readouts demonstrating independence from dynein pathway; single lab, Drosophila model","pmids":["42229917"],"is_preprint":false}],"current_model":"NUDC is a multifunctional co-chaperone of Hsp90 that stabilizes client proteins (including LIS1, cofilin 1, filamin A) by facilitating client transfer from the Hsp40/70 system to Hsp90; it forms a complex with cytoplasmic dynein and LIS1 to regulate nuclear and neuronal migration, and during mitosis it acts as both a substrate and spatial regulator of Plk1 (phosphorylated at S274/S326) and Aurora B (phosphorylated at T40), localizing to kinetochores to promote chromosome congression and to the midbody to regulate cytokinesis abscission, while its deacetylation at K39 by HDAC3 is also required for proper spindle function."},"narrative":{"mechanistic_narrative":"NUDC is a CS-domain co-chaperone of the Hsp90 system that stabilizes a defined set of cytoskeletal and motility client proteins and, through them, governs nuclear and cell migration, mitosis, cytokinesis, and ciliogenesis [PMID:20675372, PMID:35063133, PMID:12679384]. Mechanistically it acts as an essential transfer factor that engages Hsp40 within Hsp40–Hsp70–client complexes, displaces Hsp70, and hands clients to Hsp90 for activation, an activity required for cellular viability [PMID:35063133]; it also possesses intrinsic chaperone (anti-aggregation) activity and dimerizes through an N-terminal coiled coil [PMID:21530541]. Its best-defined clients include LIS1, whose stabilization places NUDC upstream of LIS1 in the cytoplasmic dynein pathway controlling nuclear and neuronal migration [PMID:20675372, PMID:9013770, PMID:21771589], cofilin 1, through which NUDC regulates actin dynamics and ciliogenesis [PMID:26704451], and filamin A, required for cell migration [PMID:34262899]. In mitosis NUDC is a substrate and spatial regulator of mitotic kinases: Plk1 phosphorylates it at S274/S326 to target Plk1 to kinetochores and drive chromosome congression and cytokinesis [PMID:12852857, PMID:16860740], Aurora B phosphorylates it at T40 to control abscission [PMID:27074040], and HDAC3-dependent deacetylation at K39 is required for proper spindle function [PMID:24069238]. NUDC is recruited to the mitotic spindle by EML4 [PMID:25789526] and its abundance is controlled by RNF41-mediated ubiquitination and proteasomal degradation [PMID:40494872]. NUDC also supports photoreceptor outer-segment biogenesis in a LIS1-independent manner involving dynein- and cofilin-dependent processes [PMID:38441532, PMID:31022349].","teleology":[{"year":1997,"claim":"Established that NUDC is a conserved component of the nuclear migration pathway acting genetically upstream of the LIS1 ortholog, framing all subsequent dynein-related work.","evidence":"Functional complementation of the Aspergillus nudC3 mutant by rat NudC, restoring NudF protein levels","pmids":["9013770"],"confidence":"High","gaps":["Did not define the biochemical mechanism by which NudC supports NudF/LIS1","Cross-species complementation does not establish the mammalian molecular interaction"]},{"year":1998,"claim":"Answered whether NUDC physically engages LIS1, providing the molecular basis for the genetic epistasis seen in fungi.","evidence":"Yeast two-hybrid, in vitro pulldown, and reciprocal co-IP from mouse brain extracts","pmids":["9601647"],"confidence":"High","gaps":["Did not address whether binding is direct or chaperone-mediated","No functional consequence of the interaction defined"]},{"year":2001,"claim":"Placed NUDC within the cytoplasmic dynein motor complex at the MTOC during neuronal migration, connecting it to motor-driven movement.","evidence":"Immunofluorescence colocalization and co-IP of NudC with dynein intermediate and heavy chains from brain","pmids":["11734602"],"confidence":"High","gaps":["Did not distinguish whether NudC is a structural motor subunit or a regulatory chaperone","Stoichiometry within the complex unknown"]},{"year":2003,"claim":"Demonstrated a mitotic/cytokinetic role and linked NUDC to Plk1 localization, broadening its function beyond migration.","evidence":"siRNA knockdown and overexpression in mammalian cells plus RNAi in C. elegans with cytokinesis phenotypes; Plk1 mislocalization","pmids":["12679384"],"confidence":"High","gaps":["Mechanism of Plk1 mislocalization not defined","Whether effect is direct or via cytoskeletal disruption unresolved"]},{"year":2003,"claim":"Established a direct kinase-substrate relationship by showing Plk1 phosphorylates NudC at S274/S326 and that this is functionally required for cytokinesis.","evidence":"cDNA phage display, in vitro and in vivo kinase assays, and phospho-site mutant rescue of RNAi defects","pmids":["12852857"],"confidence":"High","gaps":["Did not explain how phosphorylation alters NudC function biochemically","Downstream effectors of phospho-NudC undefined"]},{"year":2006,"claim":"Defined NUDC as both substrate and spatial regulator of Plk1 at kinetochores, linking it to chromosome congression.","evidence":"siRNA knockdown, kinetochore immunofluorescence, and phospho-mutant rescue showing loss of Plk1/CENP-E targeting","pmids":["16860740"],"confidence":"High","gaps":["Mechanism of Plk1 recruitment by phospho-NudC not structurally defined","Relationship between kinetochore and cytokinesis roles unclear"]},{"year":2010,"claim":"Reframed NUDC as an Hsp90 co-chaperone whose chaperone activity stabilizes LIS1, explaining the basis of the long-known NudC–LIS1 epistasis.","evidence":"ATPase assays, Hsp90 binding, L279P chaperone-defective mutant, and pharmacological Hsp90 inhibition with LIS1 readout","pmids":["20675372"],"confidence":"High","gaps":["Did not define the molecular step of client handoff","Whether all NudC functions are chaperone-dependent unresolved"]},{"year":2011,"claim":"Provided structural basis for co-chaperone identity (CS domain, coiled-coil dimerization) and intrinsic anti-aggregation activity.","evidence":"X-ray crystallography, NMR, and in vitro aggregation assays of NudC paralogs","pmids":["21530541"],"confidence":"High","gaps":["No binary NudC–LIS1 complex formed in vitro, leaving direct binding mode unresolved","Paralog functional divergence not mechanistically explained"]},{"year":2011,"claim":"Confirmed an in vivo requirement for NUDC in interkinetic nuclear migration and neocortical neuronal migration.","evidence":"In utero electroporation of shRNA and mutant constructs in embryonic rat brain","pmids":["21771589"],"confidence":"High","gaps":["Did not separate chaperone from dynein-complex contributions in vivo","Cell-autonomous vs non-autonomous effects not dissected"]},{"year":2013,"claim":"Identified acetylation as a regulatory layer, with HDAC3-mediated deacetylation at K39 required for spindle function.","evidence":"Mass spectrometry, K39Q/K39R rescue assays, co-IP with HDAC3, and HDAC3 inhibition","pmids":["24069238"],"confidence":"High","gaps":["Acetyltransferase for K39 not identified","How acetylation alters NudC activity mechanistically unknown"]},{"year":2015,"claim":"Extended NUDC chaperone clientele to cofilin 1, linking NUDC to actin dynamics and ciliogenesis.","evidence":"Co-IP, knockdown/rescue epistasis in cells, and zebrafish morpholino phenotypes","pmids":["26704451"],"confidence":"High","gaps":["Whether cofilin stabilization is Hsp90-dependent not tested here","Direct vs indirect binding undefined"]},{"year":2015,"claim":"Identified the spindle-recruitment mechanism by showing EML4 loads NudC onto the mitotic spindle via its WD40 repeat.","evidence":"Interactome MS, co-IP, siRNA, and immunofluorescence localization","pmids":["25789526"],"confidence":"Medium","gaps":["Single-lab interaction without reciprocal structural validation","Whether EML4-loaded NudC carries clients to the spindle unknown"]},{"year":2016,"claim":"Defined Aurora B phosphorylation of NudC at T40 and showed dynamic dephosphorylation is required for abscission.","evidence":"Aurora B inhibition, T40A/T40D rescue assays, and midbody co-IP/colocalization","pmids":["27074040"],"confidence":"High","gaps":["Phosphatase acting on T40 not identified","Interplay between T40, S274/S326, and K39 marks unresolved"]},{"year":2007,"claim":"Showed NUDC regulates an enzyme partner, increasing PAF-AH(I) catalytic activity via its conserved C-terminus.","evidence":"Co-IP and PAF-AH(I) activity assays with NudC deletion constructs","pmids":["17555748"],"confidence":"Medium","gaps":["Single lab without structural mechanism","Physiological context of PAF-AH regulation not established"]},{"year":2010,"claim":"Mapped a NUDC interaction with the thrombopoietin receptor Mpl extracellular domain, hinting at a receptor-associated role.","evidence":"Yeast two-hybrid, co-IP, phage display, ELISA, and alanine-scanning mutagenesis","pmids":["20529857"],"confidence":"Medium","gaps":["Functional/signaling consequence of binding not demonstrated","How an intracellular co-chaperone accesses an extracellular receptor domain unexplained"]},{"year":2019,"claim":"Implicated NUDC in photoreceptor disk formation through interactions with rhodopsin and Rab11a.","evidence":"Co-IP and shRNA knockdown/rescue in transgenic tadpole rods","pmids":["31022349"],"confidence":"Medium","gaps":["Direct vs chaperone-mediated interactions undefined","Single-lab model-organism study"]},{"year":2020,"claim":"Added NAGK to the NudC–Lis1–dynein complex at the nuclear envelope as a migration regulator.","evidence":"Yeast two-hybrid, pulldown, proximity ligation, wound healing, and in utero electroporation","pmids":["33374456"],"confidence":"Medium","gaps":["Mechanistic role of NAGK within the complex unclear","Single-lab interaction set"]},{"year":2022,"claim":"Resolved the central biochemical mechanism: NUDC is an essential transfer factor handing Hsp40-bound clients from Hsp70 to Hsp90.","evidence":"Biochemical reconstitution, co-IP, in vitro client activation, and genetic depletion","pmids":["35063133"],"confidence":"High","gaps":["Full client spectrum of the transfer reaction undefined","Structural basis of Hsp70 displacement not solved"]},{"year":2022,"claim":"Demonstrated in vivo that NUDC stabilizes Lis1 to restrain dynein activity and microtubule stability in axon terminals.","evidence":"Forward genetic screen, immunofluorescence, Western blot, and pharmacological dynein inhibition in zebrafish","pmids":["36147950"],"confidence":"High","gaps":["How NudC loss converts to excess dynein activity mechanistically unresolved","Generalizability beyond axon terminals untested"]},{"year":2024,"claim":"Established a LIS1-independent NUDC function in rod photoreceptors involving dynein- and cofilin-dependent processes.","evidence":"Conditional knockout in mouse rods with ERG, immunofluorescence, TEM, and Western blot","pmids":["38441532"],"confidence":"High","gaps":["Direct molecular partners driving the LIS1-independent role unclear","Cause of rapid cell death not pinpointed"]},{"year":2025,"claim":"Identified RNF41 as the E3 ligase controlling NUDC abundance, linking NudC stability to tubulin polymerization and cancer cell invasion.","evidence":"Co-IP, ubiquitination assay, knockdown/overexpression, and migration assays in bladder cancer cells","pmids":["40494872"],"confidence":"Medium","gaps":["Single-lab study","Whether ubiquitination targets specific NudC pools (spindle vs migration) untested"]},{"year":2026,"claim":"Revealed a dynein-independent role for NudC in ribosome biogenesis and translation in polyploid cells.","evidence":"RNAi in Drosophila salivary glands with ribosome profiling and RNA quantification","pmids":["42229917"],"confidence":"Medium","gaps":["Direct molecular mechanism in rRNA/ribosome production unknown","Conservation in mammalian cells untested"]},{"year":null,"claim":"How NUDC integrates its chaperone-mediated client transfer with its mitotic phospho/acetyl regulation and its newly described dynein-independent roles into a unified mechanism remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of NudC bound to a client or to Hsp90/Hsp70 in the transfer state","Whether mitotic, migratory, ciliary, and ribosome-biogenesis functions share a single biochemical activity is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[5,6,14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,5,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,10]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[10,8]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[21]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,14]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,4,11,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,19]}],"complexes":["cytoplasmic dynein complex","Hsp40-Hsp70-client complex","Hsp90 chaperone machinery"],"partners":["LIS1","HSP90","PLK1","AURKB","HDAC3","EML4","CFL1","FLNA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y266","full_name":"Nuclear migration protein nudC","aliases":["Nuclear distribution protein C homolog"],"length_aa":331,"mass_kda":38.2,"function":"Plays a role in neurogenesis and neuronal migration (By similarity). Necessary for correct formation of mitotic spindles and chromosome separation during mitosis (PubMed:12679384, PubMed:12852857, PubMed:25789526). Necessary for cytokinesis and cell proliferation (PubMed:12679384, PubMed:12852857)","subcellular_location":"Cytoplasm, cytoskeleton; Nucleus; Cytoplasm, cytoskeleton, spindle; Midbody","url":"https://www.uniprot.org/uniprotkb/Q9Y266/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NUDC","classification":"Common Essential","n_dependent_lines":1120,"n_total_lines":1208,"dependency_fraction":0.9271523178807947},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"FKBP5","stoichiometry":0.2},{"gene":"FKBP8","stoichiometry":0.2},{"gene":"PTDSS2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NUDC","total_profiled":1310},"omim":[{"mim_id":"620136","title":"NUDC DOMAIN-CONTAINING PROTEIN 2; NUDCD2","url":"https://www.omim.org/entry/620136"},{"mim_id":"610325","title":"NUCLEAR DISTRIBUTION C, DYNEIN COMPLEX REGULATOR; 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\"method\": \"Yeast two-hybrid screen, in vitro pulldown assay, co-immunoprecipitation from mouse brain extracts\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP from brain tissue plus in vitro binding plus yeast two-hybrid; multiple orthogonal methods in one study\",\n      \"pmids\": [\"9601647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NudC, Lis1, and cytoplasmic dynein intermediate chain (CDIC) colocalize at the MTOC at the leading pole of migrating cerebellar granule neurons; NudC co-immunoprecipitates with CDIC and cytoplasmic dynein heavy chain (CDHC) from mouse brain extracts, placing NudC in the dynein motor complex during neuronal migration.\",\n      \"method\": \"Immunofluorescence co-localization, co-immunoprecipitation from mouse brain extracts\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP from tissue plus direct localization in neurons; multiple orthogonal methods, replicated interaction with prior yeast two-hybrid data\",\n      \"pmids\": [\"11734602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NudC plays roles in mitosis and cytokinesis; siRNA knockdown or adenoviral overexpression causes multinucleated cells, persistent intercellular connections, and disorganized midzone/midbody matrix. Polo-like kinase 1 (Plk1) is mislocalized from centrosomes and midbody when NudC levels are altered. In C. elegans, silencing of nud-1 (NudC ortholog) causes loss of midzone microtubules and cleavage furrow regression.\",\n      \"method\": \"siRNA knockdown, adenovirus-mediated overexpression, immunofluorescence microscopy, RNAi in C. elegans\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and gain-of-function with specific cellular phenotypes, validated in two independent model systems (mammalian cells and C. elegans)\",\n      \"pmids\": [\"12679384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NudC was identified as a Plk1 binding protein via cDNA phage display; Plk1 phosphorylates NudC at conserved S274 and S326 residues in vitro and in vivo. Rescue of NudC RNAi-induced cytokinesis defects (multinucleation, midbody arrest) requires wild-type NudC but not the S274A/S326A phosphorylation site mutant, establishing that Plk1 phosphorylation of NudC is functionally required for cytokinesis.\",\n      \"method\": \"cDNA phage display, in vitro kinase assay, in vivo phosphorylation assay, siRNA knockdown with rescue using phosphorylation-site mutants\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay plus mutagenesis rescue in cells; multiple orthogonal approaches in one study\",\n      \"pmids\": [\"12852857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NudC is required for Plk1 targeting to kinetochores and chromosome congression. Plk1-phosphorylated NudC colocalizes with Plk1 at the outer kinetochore plate. NudC depletion reduces end-on microtubule attachments at kinetochores and mislocalizes Plk1 and CENP-E from prometaphase kinetochores. Rescue requires wild-type NudC but not the Plk1 phosphorylation-site mutant, establishing NudC as both substrate and spatial regulator of Plk1 at the kinetochore.\",\n      \"method\": \"siRNA knockdown, immunofluorescence microscopy, rescue with phosphorylation-site mutants\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KD with specific kinetochore phenotype plus phospho-mutant rescue; multiple readouts in one study\",\n      \"pmids\": [\"16860740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NudC functions as an Hsp90 co-chaperone to stabilize LIS1: NudC binds Hsp90, regulates Hsp90 ATPase activity, and possesses intrinsic chaperone activity. The L279P mutation (equivalent to the Aspergillus L146P temperature-sensitive mutation) impairs NudC chaperone function, reduces LIS1 protein levels, and causes LIS1-depletion-like cellular phenotypes. Hsp90 inhibition (geldanamycin/radicicol) decreases LIS1; ectopic Hsp90 partially rescues LIS1 degradation caused by NudC-L279P.\",\n      \"method\": \"Site-directed mutagenesis, ATPase activity assay, immunoprecipitation, pharmacological Hsp90 inhibition, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ATPase assay plus mutagenesis plus pharmacological inhibition, multiple orthogonal methods in one study, single lab\",\n      \"pmids\": [\"20675372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure and NMR analysis show human NudC contains a CS domain (characteristic of Hsp90 co-chaperones and small heat shock proteins) and dimerizes via an N-terminal coiled coil. NudC (and NudCL, but not NudCL2) inhibits aggregation of several target proteins in chaperone assays consistent with Hsp90-independent heat shock protein function. However, none of the three NudC paralogs formed binary complexes with Lis1 in these assays.\",\n      \"method\": \"X-ray crystallography, NMR, in vitro aggregation assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus NMR plus functional in vitro chaperone assay; multiple rigorous methods, single lab\",\n      \"pmids\": [\"21530541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NudC is required for interkinetic nuclear migration in radial glial progenitors and for neuronal migration during neocorticogenesis in rat embryo, demonstrated by in utero electroporation of shRNAs and dominant-negative/wild-type NudC constructs.\",\n      \"method\": \"In utero electroporation, shRNA knockdown, overexpression of mutant forms in embryonic rat brain\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function and rescue in rat brain with specific migration phenotype; single lab with multiple constructs\",\n      \"pmids\": [\"21771589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NudC is deacetylated during mitosis; K39 is an acetylation site on NudC. The acetylation-mimetic K39Q mutant fails to rescue mitotic phenotypes (chromosome misalignment, missegregation, reduced spindle width) caused by NudC knockdown, while the acetylation-defective K39R mutant rescues these defects. NudC co-localizes and co-immunoprecipitates with HDAC3 on the mitotic spindle; HDAC3 knockdown or inhibition increases NudC acetylation, identifying HDAC3 as a deacetylase for NudC.\",\n      \"method\": \"Mass spectrometry identification of acetylation site, site-directed mutagenesis with rescue assay, co-immunoprecipitation, pharmacological HDAC3 inhibition\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — MS identification of modification site, mutagenesis rescue, co-IP of writer enzyme; multiple orthogonal methods in one study\",\n      \"pmids\": [\"24069238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NudC binds to and stabilizes cofilin 1 (an actin dynamics regulator), thereby regulating actin organization and ciliogenesis. NudC depletion causes similar ciliary defects as cofilin 1 depletion (cilia elongation, increased ciliated cells, zebrafish curved body/pericardial edema/laterality defects). Ectopic cofilin 1 expression significantly reverses NudC depletion phenotypes, placing cofilin 1 downstream of NudC.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, rescue experiments, zebrafish morpholino knockdown with phenotypic analysis\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP plus epistasis rescue in cells and in vivo (zebrafish); multiple orthogonal methods and two model systems\",\n      \"pmids\": [\"26704451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EML4 directly interacts with NudC (interaction mediated by EML4's WD40 repeat and the C-terminus of NudC) and is required for loading NudC onto the mitotic spindle. In EML4-depleted cells, NudC fails to localize to the mitotic spindle, while NudC depletion does not affect EML4 localization.\",\n      \"method\": \"Mass spectrometry interactome screen, co-immunoprecipitation, siRNA knockdown, immunofluorescence microscopy\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS discovery plus co-IP plus localization phenotype; single lab, multiple methods\",\n      \"pmids\": [\"25789526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Aurora B phosphorylates NudC at T40; NudC co-localizes and co-immunoprecipitates with Aurora B at the midbody during mitosis. Aurora B inhibition (ZM447439) reduces NudC phosphorylation in vivo. The T40D phospho-mimetic NudC fails to rescue cytokinesis defects (intercellular bridge elongation, sustained Aurora B activity, reduced abscission) caused by NudC depletion, while T40A rescues them, indicating that dynamic dephosphorylation at T40 is required for cytokinesis completion.\",\n      \"method\": \"In vivo kinase inhibition, site-directed mutagenesis with rescue assay, co-immunoprecipitation, immunofluorescence microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — phosphorylation-site mutagenesis rescue plus pharmacological kinase inhibition plus co-IP; multiple orthogonal methods in one study\",\n      \"pmids\": [\"27074040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NudC interacts with rhodopsin and the small GTPase Rab11a in rod photoreceptors. NudC is required for disk formation and photoreceptor protein localization in rod outer segments, as demonstrated by transgenic tadpole studies with NudC shRNA knockdown and rescue with murine NudC.\",\n      \"method\": \"Co-immunoprecipitation, shRNA knockdown in transgenic tadpoles, rescue experiments\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for binding partners plus in vivo knockdown/rescue in tadpole photoreceptors; single lab\",\n      \"pmids\": [\"31022349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NudC (as an Hsp90 co-chaperone) is required to stabilize filamin A; NudC interacts with filamin A (identified by IP-mass spectrometry). The chaperone-defective NudC-L279P mutant decreases filamin A protein levels, causes actin disorganization, and suppresses cell migration. Ectopic filamin A or Hsp90 reverses these defects, placing filamin A as an Hsp90/NudC client required for cell migration.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry, Western blot, overexpression of NudC-L279P mutant, rescue with filamin A or Hsp90, pharmacological Hsp90 inhibition\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS plus mutagenesis plus pharmacological rescue; single lab, multiple methods\",\n      \"pmids\": [\"34262899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NudC acts as an essential transfer factor between the Hsp40/70 and Hsp90 chaperone systems: NudC interacts with Hsp40 within Hsp40-Hsp70-client complexes and displaces Hsp70; NudC then interacts with Hsp90, enabling direct transfer of Hsp40-bound clients to Hsp90 for further processing. NudC increases client activation in vitro and in cells and is essential for cellular viability.\",\n      \"method\": \"Biochemical reconstitution, co-immunoprecipitation, in vitro client activation assay, genetic depletion\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted transfer mechanism in vitro plus validated in cells; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"35063133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In zebrafish axon terminals, NudC acts as a chaperone for Lis1; loss of NudC function reduces Lis1 levels, causing dynein/dynactin accumulation and increased microtubule stability. Pharmacological dynein inhibition restores microtubule dynamics in nudc mutant axon terminals, placing excess dynein motor activity downstream of NudC/Lis1 depletion in microtubule regulation.\",\n      \"method\": \"Forward genetic screen, immunofluorescence, pharmacological dynein inhibition, Western blot in zebrafish\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — forward genetic screen plus epistasis with pharmacological rescue; multiple methods in one study\",\n      \"pmids\": [\"36147950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Conditional knockout of NudC in mouse rod photoreceptors causes rhodopsin and mitochondria mislocalization (consistent with dynein inhibition), increased phosphorylated cofilin 1 (implicating NudC in cofilin 1-mediated actin depolymerization), ultrastructural outer segment defects, and rapid photoreceptor cell death by 6 weeks. LIS1 levels were unaffected, indicating a LIS1-independent role of NudC in rods.\",\n      \"method\": \"Conditional CRISPR/Cas9 knockout in mouse rods, electroretinography, immunofluorescence, transmission electron microscopy, Western blot\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with multiple functional and ultrastructural readouts; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"38441532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mouse NudC interacts with the regulatory beta subunit of platelet-activating factor acetylhydrolase I (PAF-AH(I)) and increases PAF-AH(I) catalytic activity; this regulatory activity maps to the conserved C-terminal half of NudC.\",\n      \"method\": \"Co-immunoprecipitation, PAF-AH(I) enzymatic activity assay with NudC deletion constructs\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus enzymatic activity assay with domain mapping; single lab\",\n      \"pmids\": [\"17555748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF41 (an E3 ubiquitin ligase) directly interacts with NudC, ubiquitinates NudC, and promotes its proteasomal degradation. Loss of RNF41 increases NudC stability, which enhances β-tubulin polymerization and promotes bladder cancer cell migration and invasion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown and overexpression, Western blot, in vitro migration assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus ubiquitination assay with functional rescue; single lab\",\n      \"pmids\": [\"40494872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Rat NudC (c15/RnudC) functionally complements the Aspergillus nudC3 nuclear migration mutant and restores NudF protein levels, demonstrating functional conservation of the nuclear migration role and indicating that NudC acts upstream of NudF (Lis1 ortholog) in the nuclear distribution pathway.\",\n      \"method\": \"Functional complementation in Aspergillus nidulans nudC3 temperature-sensitive mutant\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct functional complementation assay with pathway epistasis; single study but clean genetic readout\",\n      \"pmids\": [\"9013770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human NudC binds to the thrombopoietin receptor (Mpl) extracellular domain 1, specifically residues 206–251; two hydrophobic residues Leu228 and Leu230 are critical for hNUDC binding (identified by alanine replacement mutagenesis), and the WGSWS motif is required for hNUDC but not TPO binding.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, T7 phage display, ELISA binding assays, alanine scanning mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays plus mutagenesis to identify critical residues; single lab\",\n      \"pmids\": [\"20529857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NAGK (N-acetylglucosamine kinase) interacts with NudC and Lis1 in the dynein complex; NAGK-NudC-Lis1-dynein complexes are detected around nuclei and at leading poles of migrating cells. NAGK overexpression accelerates cell migration while NAGK knockdown delays it; a NAGK peptide from the NudC-interacting domain retards migration, placing the NAGK-NudC-Lis1-dynein complex at the nuclear envelope as a regulator of cell migration.\",\n      \"method\": \"Yeast two-hybrid, pulldown assay, immunocytochemistry, proximity ligation assay, wound healing assay, in utero electroporation, shRNA knockdown\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays plus in vivo functional assays; single lab\",\n      \"pmids\": [\"33374456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In Drosophila polyploid salivary gland cells, NudC depletion reduces ribosome abundance, impairs translation, decreases ribosomal RNA levels, and triggers a homeostatic transcriptional/translational upregulation of ribosome biogenesis factors. This role in ribosome biogenesis is independent of NudC's established function in dynein regulation.\",\n      \"method\": \"RNAi knockdown in Drosophila salivary glands, ribosome profiling, RNA quantification, immunofluorescence\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi loss-of-function with multiple molecular readouts demonstrating independence from dynein pathway; single lab, Drosophila model\",\n      \"pmids\": [\"42229917\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUDC is a multifunctional co-chaperone of Hsp90 that stabilizes client proteins (including LIS1, cofilin 1, filamin A) by facilitating client transfer from the Hsp40/70 system to Hsp90; it forms a complex with cytoplasmic dynein and LIS1 to regulate nuclear and neuronal migration, and during mitosis it acts as both a substrate and spatial regulator of Plk1 (phosphorylated at S274/S326) and Aurora B (phosphorylated at T40), localizing to kinetochores to promote chromosome congression and to the midbody to regulate cytokinesis abscission, while its deacetylation at K39 by HDAC3 is also required for proper spindle function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NUDC is a CS-domain co-chaperone of the Hsp90 system that stabilizes a defined set of cytoskeletal and motility client proteins and, through them, governs nuclear and cell migration, mitosis, cytokinesis, and ciliogenesis [#5, #14, #2]. Mechanistically it acts as an essential transfer factor that engages Hsp40 within Hsp40–Hsp70–client complexes, displaces Hsp70, and hands clients to Hsp90 for activation, an activity required for cellular viability [#14]; it also possesses intrinsic chaperone (anti-aggregation) activity and dimerizes through an N-terminal coiled coil [#6]. Its best-defined clients include LIS1, whose stabilization places NUDC upstream of LIS1 in the cytoplasmic dynein pathway controlling nuclear and neuronal migration [#5, #19, #7], cofilin 1, through which NUDC regulates actin dynamics and ciliogenesis [#9], and filamin A, required for cell migration [#13]. In mitosis NUDC is a substrate and spatial regulator of mitotic kinases: Plk1 phosphorylates it at S274/S326 to target Plk1 to kinetochores and drive chromosome congression and cytokinesis [#3, #4], Aurora B phosphorylates it at T40 to control abscission [#11], and HDAC3-dependent deacetylation at K39 is required for proper spindle function [#8]. NUDC is recruited to the mitotic spindle by EML4 [#10] and its abundance is controlled by RNF41-mediated ubiquitination and proteasomal degradation [#18]. NUDC also supports photoreceptor outer-segment biogenesis in a LIS1-independent manner involving dynein- and cofilin-dependent processes [#16, #12].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established that NUDC is a conserved component of the nuclear migration pathway acting genetically upstream of the LIS1 ortholog, framing all subsequent dynein-related work.\",\n      \"evidence\": \"Functional complementation of the Aspergillus nudC3 mutant by rat NudC, restoring NudF protein levels\",\n      \"pmids\": [\"9013770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the biochemical mechanism by which NudC supports NudF/LIS1\", \"Cross-species complementation does not establish the mammalian molecular interaction\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Answered whether NUDC physically engages LIS1, providing the molecular basis for the genetic epistasis seen in fungi.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro pulldown, and reciprocal co-IP from mouse brain extracts\",\n      \"pmids\": [\"9601647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address whether binding is direct or chaperone-mediated\", \"No functional consequence of the interaction defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed NUDC within the cytoplasmic dynein motor complex at the MTOC during neuronal migration, connecting it to motor-driven movement.\",\n      \"evidence\": \"Immunofluorescence colocalization and co-IP of NudC with dynein intermediate and heavy chains from brain\",\n      \"pmids\": [\"11734602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not distinguish whether NudC is a structural motor subunit or a regulatory chaperone\", \"Stoichiometry within the complex unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated a mitotic/cytokinetic role and linked NUDC to Plk1 localization, broadening its function beyond migration.\",\n      \"evidence\": \"siRNA knockdown and overexpression in mammalian cells plus RNAi in C. elegans with cytokinesis phenotypes; Plk1 mislocalization\",\n      \"pmids\": [\"12679384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Plk1 mislocalization not defined\", \"Whether effect is direct or via cytoskeletal disruption unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established a direct kinase-substrate relationship by showing Plk1 phosphorylates NudC at S274/S326 and that this is functionally required for cytokinesis.\",\n      \"evidence\": \"cDNA phage display, in vitro and in vivo kinase assays, and phospho-site mutant rescue of RNAi defects\",\n      \"pmids\": [\"12852857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain how phosphorylation alters NudC function biochemically\", \"Downstream effectors of phospho-NudC undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined NUDC as both substrate and spatial regulator of Plk1 at kinetochores, linking it to chromosome congression.\",\n      \"evidence\": \"siRNA knockdown, kinetochore immunofluorescence, and phospho-mutant rescue showing loss of Plk1/CENP-E targeting\",\n      \"pmids\": [\"16860740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Plk1 recruitment by phospho-NudC not structurally defined\", \"Relationship between kinetochore and cytokinesis roles unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reframed NUDC as an Hsp90 co-chaperone whose chaperone activity stabilizes LIS1, explaining the basis of the long-known NudC–LIS1 epistasis.\",\n      \"evidence\": \"ATPase assays, Hsp90 binding, L279P chaperone-defective mutant, and pharmacological Hsp90 inhibition with LIS1 readout\",\n      \"pmids\": [\"20675372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular step of client handoff\", \"Whether all NudC functions are chaperone-dependent unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided structural basis for co-chaperone identity (CS domain, coiled-coil dimerization) and intrinsic anti-aggregation activity.\",\n      \"evidence\": \"X-ray crystallography, NMR, and in vitro aggregation assays of NudC paralogs\",\n      \"pmids\": [\"21530541\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No binary NudC–LIS1 complex formed in vitro, leaving direct binding mode unresolved\", \"Paralog functional divergence not mechanistically explained\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Confirmed an in vivo requirement for NUDC in interkinetic nuclear migration and neocortical neuronal migration.\",\n      \"evidence\": \"In utero electroporation of shRNA and mutant constructs in embryonic rat brain\",\n      \"pmids\": [\"21771589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate chaperone from dynein-complex contributions in vivo\", \"Cell-autonomous vs non-autonomous effects not dissected\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified acetylation as a regulatory layer, with HDAC3-mediated deacetylation at K39 required for spindle function.\",\n      \"evidence\": \"Mass spectrometry, K39Q/K39R rescue assays, co-IP with HDAC3, and HDAC3 inhibition\",\n      \"pmids\": [\"24069238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase for K39 not identified\", \"How acetylation alters NudC activity mechanistically unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended NUDC chaperone clientele to cofilin 1, linking NUDC to actin dynamics and ciliogenesis.\",\n      \"evidence\": \"Co-IP, knockdown/rescue epistasis in cells, and zebrafish morpholino phenotypes\",\n      \"pmids\": [\"26704451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cofilin stabilization is Hsp90-dependent not tested here\", \"Direct vs indirect binding undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified the spindle-recruitment mechanism by showing EML4 loads NudC onto the mitotic spindle via its WD40 repeat.\",\n      \"evidence\": \"Interactome MS, co-IP, siRNA, and immunofluorescence localization\",\n      \"pmids\": [\"25789526\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction without reciprocal structural validation\", \"Whether EML4-loaded NudC carries clients to the spindle unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined Aurora B phosphorylation of NudC at T40 and showed dynamic dephosphorylation is required for abscission.\",\n      \"evidence\": \"Aurora B inhibition, T40A/T40D rescue assays, and midbody co-IP/colocalization\",\n      \"pmids\": [\"27074040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase acting on T40 not identified\", \"Interplay between T40, S274/S326, and K39 marks unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed NUDC regulates an enzyme partner, increasing PAF-AH(I) catalytic activity via its conserved C-terminus.\",\n      \"evidence\": \"Co-IP and PAF-AH(I) activity assays with NudC deletion constructs\",\n      \"pmids\": [\"17555748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without structural mechanism\", \"Physiological context of PAF-AH regulation not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapped a NUDC interaction with the thrombopoietin receptor Mpl extracellular domain, hinting at a receptor-associated role.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, phage display, ELISA, and alanine-scanning mutagenesis\",\n      \"pmids\": [\"20529857\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional/signaling consequence of binding not demonstrated\", \"How an intracellular co-chaperone accesses an extracellular receptor domain unexplained\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated NUDC in photoreceptor disk formation through interactions with rhodopsin and Rab11a.\",\n      \"evidence\": \"Co-IP and shRNA knockdown/rescue in transgenic tadpole rods\",\n      \"pmids\": [\"31022349\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs chaperone-mediated interactions undefined\", \"Single-lab model-organism study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Added NAGK to the NudC–Lis1–dynein complex at the nuclear envelope as a migration regulator.\",\n      \"evidence\": \"Yeast two-hybrid, pulldown, proximity ligation, wound healing, and in utero electroporation\",\n      \"pmids\": [\"33374456\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic role of NAGK within the complex unclear\", \"Single-lab interaction set\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the central biochemical mechanism: NUDC is an essential transfer factor handing Hsp40-bound clients from Hsp70 to Hsp90.\",\n      \"evidence\": \"Biochemical reconstitution, co-IP, in vitro client activation, and genetic depletion\",\n      \"pmids\": [\"35063133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full client spectrum of the transfer reaction undefined\", \"Structural basis of Hsp70 displacement not solved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated in vivo that NUDC stabilizes Lis1 to restrain dynein activity and microtubule stability in axon terminals.\",\n      \"evidence\": \"Forward genetic screen, immunofluorescence, Western blot, and pharmacological dynein inhibition in zebrafish\",\n      \"pmids\": [\"36147950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NudC loss converts to excess dynein activity mechanistically unresolved\", \"Generalizability beyond axon terminals untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a LIS1-independent NUDC function in rod photoreceptors involving dynein- and cofilin-dependent processes.\",\n      \"evidence\": \"Conditional knockout in mouse rods with ERG, immunofluorescence, TEM, and Western blot\",\n      \"pmids\": [\"38441532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular partners driving the LIS1-independent role unclear\", \"Cause of rapid cell death not pinpointed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified RNF41 as the E3 ligase controlling NUDC abundance, linking NudC stability to tubulin polymerization and cancer cell invasion.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, knockdown/overexpression, and migration assays in bladder cancer cells\",\n      \"pmids\": [\"40494872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Whether ubiquitination targets specific NudC pools (spindle vs migration) untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Revealed a dynein-independent role for NudC in ribosome biogenesis and translation in polyploid cells.\",\n      \"evidence\": \"RNAi in Drosophila salivary glands with ribosome profiling and RNA quantification\",\n      \"pmids\": [\"42229917\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular mechanism in rRNA/ribosome production unknown\", \"Conservation in mammalian cells untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NUDC integrates its chaperone-mediated client transfer with its mitotic phospho/acetyl regulation and its newly described dynein-independent roles into a unified mechanism remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of NudC bound to a client or to Hsp90/Hsp70 in the transfer state\", \"Whether mitotic, migratory, ciliary, and ribosome-biogenesis functions share a single biochemical activity is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [5, 6, 14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 5, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [10, 8]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 4, 11, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 19]}\n    ],\n    \"complexes\": [\n      \"cytoplasmic dynein complex\",\n      \"Hsp40-Hsp70-client complex\",\n      \"Hsp90 chaperone machinery\"\n    ],\n    \"partners\": [\n      \"LIS1\",\n      \"Hsp90\",\n      \"PLK1\",\n      \"AURKB\",\n      \"HDAC3\",\n      \"EML4\",\n      \"CFL1\",\n      \"FLNA\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}