{"gene":"NUCKS1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2001,"finding":"NUCKS1 (then called P1/NUCKS) is a nuclear phosphoprotein that serves as a substrate for Cdk1 during mitosis; phosphopeptide mapping and back-phosphorylation experiments using HeLa interphase and metaphase cell-derived protein demonstrated mitosis-specific phosphorylation of threonine residues by Cdk1.","method":"Phosphopeptide mapping, back-phosphorylation assays, molecular cloning","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro and in vivo phosphorylation assays with phosphopeptide mapping; foundational paper replicated by subsequent work","pmids":["11298763"],"is_preprint":false},{"year":2002,"finding":"NUCKS1 contains a putative DNA-binding domain with an extended GRP motif that forms an alpha helix and fits into the major groove of DNA via basic residues; phosphorylation of the Cdk1 site within this domain completely abolishes DNA binding in vitro.","method":"Synthetic peptide DNA-binding assay, NMR structural analysis, docking modeling, in vitro phosphorylation","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro assay with mutagenesis-equivalent (phosphorylation abolishing binding) and NMR, single lab","pmids":["12413487"],"is_preprint":false},{"year":2004,"finding":"The NUCKS1 protein is a vertebrate-specific protein whose fish ortholog is also a substrate for CDK1 and CK-2 in vitro, indicating conserved kinase substrate function across vertebrates. The gene lacks a TATA box but contains Inr elements, GC boxes, and an E2F-1 binding site.","method":"In vitro kinase assay, Western immunoblotting, database searches","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay replicated across species, single lab","pmids":["15381070"],"is_preprint":false},{"year":2007,"finding":"NUCKS1 contains two functional nuclear localization signals (NLS1 and NLS2); NLS1 is the primary bipartite NLS and is required for nuclear import. NLS1 mediates binding to importin alpha3 and importin alpha5 in vitro, indicating receptor-mediated nuclear import. A splice variant lacking NLS1 fails to enter the nucleus.","method":"GFP-fusion subcellular localization, site-directed mutagenesis, GFP-immunoprecipitation, GST pull-down, immunofluorescence","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (mutagenesis, pulldown, GFP localization, splice variant analysis) in single study","pmids":["17604136"],"is_preprint":false},{"year":2008,"finding":"NUCKS1 is one of the most heavily post-translationally modified proteins known; SILAC-based quantitative proteomics identified 25 phosphorylation sites (6 novel), plus multiple acetylation, methylation, and formylation sites. Cell-cycle-dependent changes include increased phosphorylation and decreased acetylation in mitotically arrested cells. At least 36 of 243 residues can be modified (57 PTMs total).","method":"SILAC quantitative proteomics, mass spectrometry, phosphopeptide mapping","journal":"Proteins","confidence":"High","confidence_rationale":"Tier 1 / Strong — comprehensive quantitative proteomics with SILAC and MS; multiple PTMs mapped systematically","pmids":["18491381"],"is_preprint":false},{"year":2014,"finding":"NUCKS1 functions as a transcriptional activator of the insulin receptor (IR) and other insulin signaling components by regulating chromatin accessibility and RNA Pol II recruitment to their promoters. NUCKS1 knockout mice show impaired insulin signaling, obesity, glucose intolerance and insulin resistance, phenotypes worsened by high-fat diet.","method":"Genome-wide ChIP-seq, NUCKS1 knockout mouse, glucose/insulin tolerance tests, knockdown in endocrine cells","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus genetic KO with defined metabolic phenotype, multiple orthogonal methods","pmids":["24931609"],"is_preprint":false},{"year":2014,"finding":"NUCKS1 physically interacts with HIV-1 Tat protein (identified by yeast two-hybrid and confirmed by co-immunoprecipitation) and acts as a Tat coactivator; NUCKS1 knockdown reduces Tat accumulation at the TAR region of the HIV-1 LTR (by ChIP assay) and diminishes viral transcription and replication, without affecting Tat nuclear localization or Cyclin T1 interaction.","method":"Yeast two-hybrid, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter assay, siRNA knockdown","journal":"Retrovirology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus ChIP functional validation, single lab","pmids":["25116364"],"is_preprint":false},{"year":2015,"finding":"NUCKS1 shares extensive sequence homology with RAD51AP1 and functions as a paralog in homologous recombination (HR) DNA repair; NUCKS1 depletion impairs HR, increases sensitivity to mitomycin C, increases chromatid breaks, and slows replication fork progression with increased new origin firing. Recombinant NUCKS1 binds DNA with the same preference as RAD51AP1 but with lower affinity.","method":"siRNA knockdown, HR assay, chromatid break analysis, DNA fiber assay, recombinant protein DNA-binding assay, MMC sensitivity assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (HR assay, fiber assay, in vitro DNA binding, MMC sensitivity) demonstrating mechanistic role in HR","pmids":["26323318"],"is_preprint":false},{"year":2015,"finding":"Hypothalamic NUCKS1 specifically regulates peripheral glucose homeostasis and insulin signaling; hypothalamus-specific NUCKS1 knockout mice show glucose intolerance on normal chow and exacerbated obesity and insulin resistance on high-fat diet, while immune-cell-specific NUCKS1 knockout does not produce these phenotypes.","method":"Conditional tissue-specific Cre-lox knockout mice (Nkx2.1-Cre), glucose tolerance test, insulin tolerance test, intracerebroventricular insulin injection","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific genetic KO with defined metabolic phenotype and tissue-specificity controls","pmids":["26205492"],"is_preprint":false},{"year":2016,"finding":"NUCKS1 is phosphorylated on 11 sites by CK2 (at least 7 confirmed in vivo) and on two sites by ATM kinase and DNA-PK in vitro; ATM-mediated phosphorylation of NUCKS1 occurs in vivo in gamma-irradiated cells, linking NUCKS1 to the DNA damage response via PIKK kinases.","method":"In vitro and in vivo phosphorylation assays, mass spectrometry, phosphopeptide mapping, phosphoamino acid analysis, phosphospecific antibodies, kinase inhibitors","journal":"Biochimica et biophysica acta. Proteins and proteomics","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biochemical methods (in vitro kinase assay, MS, phosphospecific antibodies, inhibitors, in vivo confirmation)","pmids":["28011258"],"is_preprint":false},{"year":2016,"finding":"In a Trp53-deficient background, loss of one Nucks1 allele accelerates radiation-induced thymic lymphoma development in mice, and wild-type Nucks1 levels are required to suppress radiation-induced lymphomagenesis, consistent with NUCKS1 functioning in the DNA damage response as a tumor suppressor.","method":"Mouse genetics (Trp53+/- Nucks1+/- compound mutant), X-irradiation, tumor analysis, LOH analysis, flow cytometry","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in vivo with defined phenotype, single lab","pmids":["27542204"],"is_preprint":false},{"year":2017,"finding":"NUCKS1 regulates NF-κB-mediated cytokine expression in corneal epithelial cells; NUCKS1 knockout reduces LPS-induced NF-κB activation and downstream expression of IL6, IP10, and TNFα in vitro, and suppresses inflammation and neovascularization in an in vivo corneal alkali burn model.","method":"NUCKS1 knockout mice, alkali burn model, in vitro LPS-NF-κB assay, cytokine profiling, siRNA silencing","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO combined with in vitro NF-κB reporter and cytokine measurements, single lab","pmids":["28106169"],"is_preprint":false},{"year":2019,"finding":"NUCKS1 promotes gastric cancer cell proliferation and invasion via transcriptional upregulation of IGF-1R, which activates the PI3K/Akt/mTOR pathway; IGF-1R knockdown eliminates the pro-tumorigenic effects of NUCKS1 overexpression, placing NUCKS1 upstream of IGF-1R/PI3K/Akt/mTOR signaling.","method":"siRNA knockdown, ectopic overexpression, xenograft mouse model, Western blotting, cell invasion/proliferation assays","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis by rescue experiment (IGF-1R KD reverses NUCKS1 OE), multiple functional assays, single lab","pmids":["30371738"],"is_preprint":false},{"year":2020,"finding":"NUCKS1 physically and functionally interacts with the DNA motor protein RAD54; NUCKS1 stimulates the ATPase activity of RAD54 and the RAD51-RAD54-mediated strand invasion step during D-loop formation in vitro. In cells, NUCKS1 controls resolution of RAD54 foci after DNA damage and prevents inappropriate engagement of RAD54 with RAD51AP1 in unperturbed cells.","method":"Co-immunoprecipitation, in vitro ATPase assay, in vitro D-loop assay, focus formation/resolution assay, cell-based DNA damage assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted biochemical activities (ATPase, D-loop) plus cellular epistasis with Co-IP, multiple orthogonal methods","pmids":["32876692"],"is_preprint":false},{"year":2020,"finding":"NUCKS1 knockdown in gastric cancer cells induces autophagy through the mTOR-Beclin1 pathway; this autophagy induction is rescued by NUCKS1 restoration, and Beclin1 silencing in NUCKS1-knockdown cells, or rapamycin treatment in NUCKS1-overexpressing cells, confirms NUCKS1 acts upstream of mTOR to suppress Beclin1-dependent autophagy.","method":"siRNA knockdown, genetic rescue, rapamycin treatment, Western blotting, autophagy assays, xenograft","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis via multiple genetic/pharmacological perturbations, single lab","pmids":["32958058"],"is_preprint":false},{"year":2020,"finding":"NUCKS1 physically interacts with CDK1 (verified by co-immunoprecipitation) and promotes CDK1 expression in NSCLC cells; CDK1 knockdown or inhibition alleviates the pro-proliferative and pro-invasive effects of NUCKS1 overexpression.","method":"Co-immunoprecipitation, shRNA knockdown, CDK1 inhibitor, cell proliferation/invasion assays, xenograft","journal":"Cancer management and research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus epistasis via CDK1 knockdown rescue, single lab","pmids":["33380837"],"is_preprint":false},{"year":2021,"finding":"NUCKS1 functions as a transcription factor that is recruited to chromatin in response to mitogenic stimulation to activate SKP2 expression, leading to degradation of p21 and p27 and S phase entry. DNA damage induces p53-dependent transcriptional repression of NUCKS1, causing SKP2 downregulation, p21/p27 accumulation, and cell cycle arrest (NUCKS1-SKP2-p21/p27 axis).","method":"ChIP, siRNA/shRNA knockdown, reporter assay, cell cycle analysis, epistasis by genetic manipulation of each component","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct chromatin recruitment, multiple epistasis experiments, well-defined pathway axis, peer-reviewed","pmids":["34845229"],"is_preprint":false},{"year":2023,"finding":"NUCKS1 transcriptionally upregulates asparagine synthetase (ASNS), elevating asparagine levels in osteosarcoma cells to promote proliferation and metastasis; ASNS inhibition or asparagine reduction diminishes the pro-tumorigenic effects of NUCKS1.","method":"siRNA knockdown, overexpression, asparagine measurement, ASNS inhibition, xenograft, in vitro functional assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis via ASNS inhibition rescuing NUCKS1 effect, single lab","pmids":["37528150"],"is_preprint":false},{"year":2024,"finding":"NUCB2 interacts with NUCKS1 protein to inhibit its degradation (stabilization), which in turn allows NUCKS1 to transcriptionally upregulate CXCL8 expression in osteosarcoma, promoting PD-L1 expression and immunosuppression.","method":"Co-immunoprecipitation, knockdown, Western blotting, reporter assay, in vivo tumor model","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP for interaction, functional epistasis, single lab","pmids":["38636892"],"is_preprint":false},{"year":2025,"finding":"NUCKS1 directly binds to the promoter of Cdc42 and transcriptionally upregulates Cdc42 expression in hepatocellular carcinoma, promoting cancer cell proliferation and migration; Cdc42 expression is positively correlated with NUCKS1 in HCC tissues.","method":"ChIP (promoter binding), siRNA knockdown, overexpression, in vitro and in vivo functional assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by ChIP plus functional epistasis, single lab","pmids":["40226459"],"is_preprint":false},{"year":2025,"finding":"NUCKS1 stabilizes HDAC2 by inhibiting lysosomal degradation, leading to AKT activation and promotion of colorectal cancer invasion and metastasis; HDAC2 inhibition or AKT inhibition rescues the pro-metastatic effects of NUCKS1 overexpression both in vitro and in vivo.","method":"Knockdown/overexpression, HDAC2 inhibitor (Santacruzamate A), AKT inhibitor (LY294002), in vivo tail-vein metastasis model, Western blotting","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological and genetic epistasis with in vivo validation, single lab","pmids":["40527876"],"is_preprint":false},{"year":2025,"finding":"NUCKS1 directly binds to the promoter of S100A9 and transcriptionally upregulates its expression in HNSCC, enhancing malignancy; NUCKS1 ablation decreases S100A9 promoter activity and expression.","method":"Promoter reporter assay, siRNA knockdown, overexpression, in vitro and in vivo functional assays","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter activity assay plus functional epistasis, single lab","pmids":["40946978"],"is_preprint":false},{"year":2026,"finding":"DDX21 binds the NUCKS1 promoter and its downregulation reduces NUCKS1 transcription, leading to elevated p21/p27 levels and G0/G1 arrest in dormancy-like colorectal cancer cells; HERC2 mediates K48/K63-linked polyubiquitination and degradation of DDX21, placing DDX21 upstream of NUCKS1 in a HERC2-DDX21-NUCKS1-p21/p27 axis.","method":"Proteomics, ChIP (DDX21 binding to NUCKS1 promoter), ubiquitination assay, knockdown/overexpression, cell cycle analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct promoter binding, ubiquitination assay, epistasis, single lab","pmids":["42071007"],"is_preprint":false}],"current_model":"NUCKS1 is a vertebrate-specific, nuclear chromatin-associated protein that functions as a transcriptional regulator (activating SKP2, insulin receptor, IGF-1R, Cdc42, ASNS, S100A9, and CXCL8 promoters), a DNA damage response factor that promotes homologous recombination by stimulating RAD54 ATPase activity and RAD51-RAD54-mediated strand invasion, and a heavily post-translationally modified substrate of CK2, CDK1, and ATM kinase; its nuclear import is mediated by importin alpha3/alpha5 via a bipartite NLS, and it integrates mitogenic and DNA damage signals at the G1/S transition through the NUCKS1-SKP2-p21/p27 axis."},"narrative":{"mechanistic_narrative":"NUCKS1 is a vertebrate-specific, chromatin-associated nuclear phosphoprotein that couples mitogenic and DNA-damage signaling to cell-cycle control through dual roles as a chromatin-binding transcriptional regulator and a homologous-recombination repair factor [PMID:24931609, PMID:26323318, PMID:34845229]. Its DNA-binding activity is mediated by a basic GRP-motif domain that inserts into the DNA major groove, and a Cdk1 phosphorylation site within this domain switches DNA binding off, linking its chromatin engagement to cell-cycle kinase activity [PMID:12413487]. Nuclear import depends on a bipartite NLS that engages importin alpha3/alpha5 [PMID:17604136], and the protein is one of the most heavily post-translationally modified proteins known, carrying numerous phosphorylation, acetylation, methylation and formylation sites with cell-cycle-dependent dynamics [PMID:18491381]; phosphorylation is imposed by CK2, CDK1, and the DNA-damage kinases ATM and DNA-PK [PMID:28011258]. As a transcriptional activator recruited to chromatin upon mitogenic stimulation, NUCKS1 activates SKP2 to drive p21/p27 degradation and S-phase entry, a circuit that is reversed by p53-dependent transcriptional repression of NUCKS1 following DNA damage (the NUCKS1-SKP2-p21/p27 axis) [PMID:34845229]. In DNA repair, NUCKS1 acts as a RAD51AP1 paralog that binds DNA and stimulates RAD54 ATPase activity and RAD51-RAD54-mediated strand invasion during D-loop formation, promoting homologous recombination, replication fork progression, and suppression of radiation-induced lymphomagenesis [PMID:26323318, PMID:32876692, PMID:27542204]. NUCKS1 also functions as a transcriptional activator of insulin/IGF signaling components, and Nucks1-knockout mice display impaired insulin signaling, obesity, glucose intolerance and insulin resistance, with hypothalamic NUCKS1 governing peripheral glucose homeostasis [PMID:24931609, PMID:26205492]. Across multiple cancers NUCKS1 promotes proliferation, invasion and metastasis by transcriptionally upregulating target genes including IGF-1R, ASNS, CXCL8, Cdc42 and S100A9 [PMID:30371738, PMID:37528150, PMID:38636892, PMID:40226459, PMID:40946978].","teleology":[{"year":2001,"claim":"Established NUCKS1 as a bona fide nuclear phosphoprotein and Cdk1 substrate, defining the first molecular handle on a cell-cycle-linked function.","evidence":"Phosphopeptide mapping and back-phosphorylation of HeLa interphase versus metaphase protein","pmids":["11298763"],"confidence":"High","gaps":["Functional consequence of mitotic phosphorylation not defined","No DNA-binding or transcriptional role established yet"]},{"year":2002,"claim":"Identified the DNA-binding determinant and showed it is regulated by Cdk1 phosphorylation, connecting kinase modification to chromatin engagement.","evidence":"Synthetic peptide DNA-binding assays, NMR, docking, and in vitro phosphorylation","pmids":["12413487"],"confidence":"Medium","gaps":["In vitro peptide model rather than full-length protein in cells","Sequence specificity of DNA binding not resolved"]},{"year":2004,"claim":"Demonstrated vertebrate conservation of NUCKS1 as a CDK1/CK2 substrate and characterized its promoter architecture.","evidence":"In vitro kinase assays on fish ortholog, immunoblotting, database analysis","pmids":["15381070"],"confidence":"Medium","gaps":["No invertebrate ortholog characterized","Functional role still undefined"]},{"year":2007,"claim":"Defined the nuclear import mechanism, showing a bipartite NLS drives receptor-mediated import via importin alpha3/alpha5.","evidence":"GFP-fusion localization, mutagenesis, pull-down, splice-variant analysis","pmids":["17604136"],"confidence":"High","gaps":["Regulation of import during cell cycle not addressed","Function of NLS2 not fully resolved"]},{"year":2008,"claim":"Mapped the extraordinary PTM landscape of NUCKS1 with cell-cycle-dependent dynamics, framing it as a heavily regulated signaling hub.","evidence":"SILAC quantitative proteomics and mass spectrometry across cell-cycle states","pmids":["18491381"],"confidence":"High","gaps":["Functional role of most individual PTMs unknown","Responsible enzymes for many sites unidentified"]},{"year":2014,"claim":"Revealed NUCKS1 as a transcriptional activator of insulin-signaling genes with a defined whole-animal metabolic phenotype.","evidence":"ChIP-seq plus Nucks1-knockout mice with glucose/insulin tolerance testing","pmids":["24931609"],"confidence":"High","gaps":["Direct DNA-binding specificity of NUCKS1 at these promoters not resolved","Cofactors mediating Pol II recruitment unknown"]},{"year":2014,"claim":"Showed NUCKS1 acts as a host coactivator of HIV-1 Tat, extending its transcriptional regulatory role to viral chromatin.","evidence":"Yeast two-hybrid, reciprocal co-IP, ChIP at the HIV-1 LTR, reporter and knockdown assays","pmids":["25116364"],"confidence":"Medium","gaps":["Single lab, mechanism of Tat stabilization at TAR unresolved","Direct versus indirect chromatin recruitment unclear"]},{"year":2015,"claim":"Established NUCKS1 as a RAD51AP1 paralog functioning in homologous recombination and replication, defining its genome-stability role.","evidence":"siRNA knockdown HR assays, DNA fiber, MMC sensitivity, recombinant DNA-binding assays","pmids":["26323318"],"confidence":"High","gaps":["Mechanistic step within HR not yet defined","Lower DNA-binding affinity than RAD51AP1 implies distinct mode"]},{"year":2015,"claim":"Localized the metabolic function to hypothalamic NUCKS1, showing tissue specificity of its insulin/glucose control.","evidence":"Conditional Nkx2.1-Cre and immune-cell-specific knockouts with metabolic phenotyping","pmids":["26205492"],"confidence":"High","gaps":["Hypothalamic neuronal target genes not mapped","Link to central insulin action mechanistically incomplete"]},{"year":2016,"claim":"Identified the kinases imposing NUCKS1 phosphorylation and linked ATM/DNA-PK modification to the DNA-damage response.","evidence":"In vitro/in vivo kinase assays, MS, phosphospecific antibodies, inhibitors, irradiation","pmids":["28011258"],"confidence":"High","gaps":["Functional consequence of ATM phosphorylation on HR not directly shown","Downstream effectors of CK2 sites unknown"]},{"year":2016,"claim":"Provided in vivo genetic evidence that NUCKS1 suppresses radiation-induced tumorigenesis, consistent with a DNA-damage-response tumor-suppressor role.","evidence":"Trp53+/- Nucks1+/- compound mutant mice, irradiation, tumor and LOH analysis","pmids":["27542204"],"confidence":"Medium","gaps":["Single lab haploinsufficiency model","Mechanistic link to HR defect in vivo not established"]},{"year":2017,"claim":"Extended NUCKS1 function to NF-kB-driven inflammatory cytokine expression in an in vivo injury model.","evidence":"Nucks1-knockout mice, corneal alkali burn, LPS-NF-kB assays, cytokine profiling","pmids":["28106169"],"confidence":"Medium","gaps":["Direct versus indirect effect on NF-kB unclear","No chromatin-level mechanism at cytokine promoters"]},{"year":2020,"claim":"Resolved the biochemical step NUCKS1 performs in HR, showing it stimulates RAD54 ATPase and RAD51-RAD54 strand invasion.","evidence":"Co-IP, reconstituted ATPase and D-loop assays, focus resolution in cells","pmids":["32876692"],"confidence":"High","gaps":["Structural basis of RAD54 stimulation not determined","Regulation of the NUCKS1/RAD51AP1 partner choice unclear"]},{"year":2021,"claim":"Defined the NUCKS1-SKP2-p21/p27 axis integrating mitogenic and p53-dependent DNA-damage signals at the G1/S transition.","evidence":"ChIP, knockdown, reporter assays, cell-cycle analysis, multi-component epistasis","pmids":["34845229"],"confidence":"High","gaps":["DNA sequence motif bound by NUCKS1 at SKP2 not defined","Coactivator machinery at SKP2 promoter unknown"]},{"year":2025,"claim":"Showed that NUCKS1 drives diverse oncogenic programs by transcriptionally upregulating effector genes and stabilizing protumorigenic proteins across cancer types.","evidence":"ChIP/promoter reporter and epistasis for IGF-1R, ASNS, CXCL8, Cdc42, S100A9, plus HDAC2 stabilization; xenograft and metastasis models","pmids":["30371738","37528150","38636892","40226459","40527876","40946978"],"confidence":"Medium","gaps":["Each target characterized in a single tumor context by a single lab","Direct DNA-binding specificity across these promoters not unified","Mechanism of protein stabilization (HDAC2, via NUCB2) incompletely defined"]},{"year":2026,"claim":"Placed NUCKS1 downstream of a HERC2-DDX21 module that controls its transcription to govern cancer-cell dormancy via p21/p27.","evidence":"Proteomics, ChIP of DDX21 at the NUCKS1 promoter, ubiquitination assays, cell-cycle analysis","pmids":["42071007"],"confidence":"Medium","gaps":["Single lab","Generality beyond dormancy-like colorectal cells unknown"]},{"year":null,"claim":"How NUCKS1's chromatin-binding mode achieves promoter selectivity, and how its many PTMs coordinate the switch between transcriptional regulation and HR repair, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No consensus DNA-binding motif defined despite many direct promoter targets","No structural model of NUCKS1 on chromatin or in the RAD54 complex","PTM code that toggles transcription versus repair function not deciphered"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,7]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,16,19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[16,5]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[7,13]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[16]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,12]}],"complexes":[],"partners":["RAD54","RAD51AP1","CDK1","NUCB2","TAT (HIV-1)","IMPORTIN ALPHA3","IMPORTIN ALPHA5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H1E3","full_name":"Nuclear ubiquitous casein and cyclin-dependent kinase substrate 1","aliases":["P1"],"length_aa":243,"mass_kda":27.3,"function":"Chromatin-associated protein involved in DNA repair by promoting homologous recombination (HR) (PubMed:26323318). Binds double-stranded DNA (dsDNA) and secondary DNA structures, such as D-loop structures, but with less affinity than RAD51AP1 (PubMed:26323318)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q9H1E3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NUCKS1","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000069275","cell_line_id":"CID001842","localizations":[{"compartment":"chromatin","grade":3},{"compartment":"nucleoplasm","grade":2}],"interactors":[{"gene":"BANF1","stoichiometry":10.0},{"gene":"H1F0","stoichiometry":10.0},{"gene":"SMARCA5","stoichiometry":10.0},{"gene":"CBX5","stoichiometry":10.0},{"gene":"TOP2A","stoichiometry":10.0},{"gene":"HIST1H1D","stoichiometry":10.0},{"gene":"PARP1","stoichiometry":10.0},{"gene":"PSMA1","stoichiometry":10.0},{"gene":"CSNK2A2","stoichiometry":10.0},{"gene":"CBX1","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001842","total_profiled":1310},"omim":[{"mim_id":"613164","title":"PARKINSON DISEASE 16; PARK16","url":"https://www.omim.org/entry/613164"},{"mim_id":"611912","title":"NUCLEAR CASEIN KINASE AND CYCLIN-DEPENDENT KINASE SUBSTRATE 1; NUCKS1","url":"https://www.omim.org/entry/611912"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NUCKS1"},"hgnc":{"alias_symbol":["NUCKS"],"prev_symbol":[]},"alphafold":{"accession":"Q9H1E3","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H1E3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H1E3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H1E3-F1-predicted_aligned_error_v6.png","plddt_mean":58.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NUCKS1","jax_strain_url":"https://www.jax.org/strain/search?query=NUCKS1"},"sequence":{"accession":"Q9H1E3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H1E3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H1E3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H1E3"}},"corpus_meta":[{"pmid":"11298763","id":"PMC_11298763","title":"Molecular cloning of a mammalian nuclear phosphoprotein NUCKS, which serves as a substrate for Cdk1 in vivo.","date":"2001","source":"European journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11298763","citation_count":66,"is_preprint":false},{"pmid":"34845229","id":"PMC_34845229","title":"The NUCKS1-SKP2-p21/p27 axis controls S phase entry.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34845229","citation_count":63,"is_preprint":false},{"pmid":"26323318","id":"PMC_26323318","title":"NUCKS1 is a novel RAD51AP1 paralog important for homologous recombination and genome stability.","date":"2015","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/26323318","citation_count":54,"is_preprint":false},{"pmid":"30371738","id":"PMC_30371738","title":"NUCKS1 promotes gastric cancer cell aggressiveness by upregulating IGF-1R and subsequently activating the PI3K/Akt/mTOR signaling pathway.","date":"2019","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/30371738","citation_count":47,"is_preprint":false},{"pmid":"18491381","id":"PMC_18491381","title":"Constitutive and dynamic phosphorylation and acetylation sites on NUCKS, a hypermodified nuclear protein, studied by quantitative proteomics.","date":"2008","source":"Proteins","url":"https://pubmed.ncbi.nlm.nih.gov/18491381","citation_count":39,"is_preprint":false},{"pmid":"24931609","id":"PMC_24931609","title":"NUCKS is a positive transcriptional regulator of insulin signaling.","date":"2014","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/24931609","citation_count":37,"is_preprint":false},{"pmid":"15381070","id":"PMC_15381070","title":"Characterisation of the NUCKS gene on human chromosome 1q32.1 and the presence of a homologous gene in different species.","date":"2004","source":"Biochemical and biophysical research 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phosphopeptide mapping and back-phosphorylation experiments using HeLa interphase and metaphase cell-derived protein demonstrated mitosis-specific phosphorylation of threonine residues by Cdk1.\",\n      \"method\": \"Phosphopeptide mapping, back-phosphorylation assays, molecular cloning\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro and in vivo phosphorylation assays with phosphopeptide mapping; foundational paper replicated by subsequent work\",\n      \"pmids\": [\"11298763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NUCKS1 contains a putative DNA-binding domain with an extended GRP motif that forms an alpha helix and fits into the major groove of DNA via basic residues; phosphorylation of the Cdk1 site within this domain completely abolishes DNA binding in vitro.\",\n      \"method\": \"Synthetic peptide DNA-binding assay, NMR structural analysis, docking modeling, in vitro phosphorylation\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro assay with mutagenesis-equivalent (phosphorylation abolishing binding) and NMR, single lab\",\n      \"pmids\": [\"12413487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The NUCKS1 protein is a vertebrate-specific protein whose fish ortholog is also a substrate for CDK1 and CK-2 in vitro, indicating conserved kinase substrate function across vertebrates. The gene lacks a TATA box but contains Inr elements, GC boxes, and an E2F-1 binding site.\",\n      \"method\": \"In vitro kinase assay, Western immunoblotting, database searches\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay replicated across species, single lab\",\n      \"pmids\": [\"15381070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NUCKS1 contains two functional nuclear localization signals (NLS1 and NLS2); NLS1 is the primary bipartite NLS and is required for nuclear import. NLS1 mediates binding to importin alpha3 and importin alpha5 in vitro, indicating receptor-mediated nuclear import. A splice variant lacking NLS1 fails to enter the nucleus.\",\n      \"method\": \"GFP-fusion subcellular localization, site-directed mutagenesis, GFP-immunoprecipitation, GST pull-down, immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (mutagenesis, pulldown, GFP localization, splice variant analysis) in single study\",\n      \"pmids\": [\"17604136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NUCKS1 is one of the most heavily post-translationally modified proteins known; SILAC-based quantitative proteomics identified 25 phosphorylation sites (6 novel), plus multiple acetylation, methylation, and formylation sites. Cell-cycle-dependent changes include increased phosphorylation and decreased acetylation in mitotically arrested cells. At least 36 of 243 residues can be modified (57 PTMs total).\",\n      \"method\": \"SILAC quantitative proteomics, mass spectrometry, phosphopeptide mapping\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — comprehensive quantitative proteomics with SILAC and MS; multiple PTMs mapped systematically\",\n      \"pmids\": [\"18491381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NUCKS1 functions as a transcriptional activator of the insulin receptor (IR) and other insulin signaling components by regulating chromatin accessibility and RNA Pol II recruitment to their promoters. NUCKS1 knockout mice show impaired insulin signaling, obesity, glucose intolerance and insulin resistance, phenotypes worsened by high-fat diet.\",\n      \"method\": \"Genome-wide ChIP-seq, NUCKS1 knockout mouse, glucose/insulin tolerance tests, knockdown in endocrine cells\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus genetic KO with defined metabolic phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"24931609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NUCKS1 physically interacts with HIV-1 Tat protein (identified by yeast two-hybrid and confirmed by co-immunoprecipitation) and acts as a Tat coactivator; NUCKS1 knockdown reduces Tat accumulation at the TAR region of the HIV-1 LTR (by ChIP assay) and diminishes viral transcription and replication, without affecting Tat nuclear localization or Cyclin T1 interaction.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter assay, siRNA knockdown\",\n      \"journal\": \"Retrovirology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus ChIP functional validation, single lab\",\n      \"pmids\": [\"25116364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NUCKS1 shares extensive sequence homology with RAD51AP1 and functions as a paralog in homologous recombination (HR) DNA repair; NUCKS1 depletion impairs HR, increases sensitivity to mitomycin C, increases chromatid breaks, and slows replication fork progression with increased new origin firing. Recombinant NUCKS1 binds DNA with the same preference as RAD51AP1 but with lower affinity.\",\n      \"method\": \"siRNA knockdown, HR assay, chromatid break analysis, DNA fiber assay, recombinant protein DNA-binding assay, MMC sensitivity assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (HR assay, fiber assay, in vitro DNA binding, MMC sensitivity) demonstrating mechanistic role in HR\",\n      \"pmids\": [\"26323318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Hypothalamic NUCKS1 specifically regulates peripheral glucose homeostasis and insulin signaling; hypothalamus-specific NUCKS1 knockout mice show glucose intolerance on normal chow and exacerbated obesity and insulin resistance on high-fat diet, while immune-cell-specific NUCKS1 knockout does not produce these phenotypes.\",\n      \"method\": \"Conditional tissue-specific Cre-lox knockout mice (Nkx2.1-Cre), glucose tolerance test, insulin tolerance test, intracerebroventricular insulin injection\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific genetic KO with defined metabolic phenotype and tissue-specificity controls\",\n      \"pmids\": [\"26205492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NUCKS1 is phosphorylated on 11 sites by CK2 (at least 7 confirmed in vivo) and on two sites by ATM kinase and DNA-PK in vitro; ATM-mediated phosphorylation of NUCKS1 occurs in vivo in gamma-irradiated cells, linking NUCKS1 to the DNA damage response via PIKK kinases.\",\n      \"method\": \"In vitro and in vivo phosphorylation assays, mass spectrometry, phosphopeptide mapping, phosphoamino acid analysis, phosphospecific antibodies, kinase inhibitors\",\n      \"journal\": \"Biochimica et biophysica acta. Proteins and proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biochemical methods (in vitro kinase assay, MS, phosphospecific antibodies, inhibitors, in vivo confirmation)\",\n      \"pmids\": [\"28011258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In a Trp53-deficient background, loss of one Nucks1 allele accelerates radiation-induced thymic lymphoma development in mice, and wild-type Nucks1 levels are required to suppress radiation-induced lymphomagenesis, consistent with NUCKS1 functioning in the DNA damage response as a tumor suppressor.\",\n      \"method\": \"Mouse genetics (Trp53+/- Nucks1+/- compound mutant), X-irradiation, tumor analysis, LOH analysis, flow cytometry\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in vivo with defined phenotype, single lab\",\n      \"pmids\": [\"27542204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NUCKS1 regulates NF-κB-mediated cytokine expression in corneal epithelial cells; NUCKS1 knockout reduces LPS-induced NF-κB activation and downstream expression of IL6, IP10, and TNFα in vitro, and suppresses inflammation and neovascularization in an in vivo corneal alkali burn model.\",\n      \"method\": \"NUCKS1 knockout mice, alkali burn model, in vitro LPS-NF-κB assay, cytokine profiling, siRNA silencing\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO combined with in vitro NF-κB reporter and cytokine measurements, single lab\",\n      \"pmids\": [\"28106169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NUCKS1 promotes gastric cancer cell proliferation and invasion via transcriptional upregulation of IGF-1R, which activates the PI3K/Akt/mTOR pathway; IGF-1R knockdown eliminates the pro-tumorigenic effects of NUCKS1 overexpression, placing NUCKS1 upstream of IGF-1R/PI3K/Akt/mTOR signaling.\",\n      \"method\": \"siRNA knockdown, ectopic overexpression, xenograft mouse model, Western blotting, cell invasion/proliferation assays\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis by rescue experiment (IGF-1R KD reverses NUCKS1 OE), multiple functional assays, single lab\",\n      \"pmids\": [\"30371738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NUCKS1 physically and functionally interacts with the DNA motor protein RAD54; NUCKS1 stimulates the ATPase activity of RAD54 and the RAD51-RAD54-mediated strand invasion step during D-loop formation in vitro. In cells, NUCKS1 controls resolution of RAD54 foci after DNA damage and prevents inappropriate engagement of RAD54 with RAD51AP1 in unperturbed cells.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ATPase assay, in vitro D-loop assay, focus formation/resolution assay, cell-based DNA damage assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted biochemical activities (ATPase, D-loop) plus cellular epistasis with Co-IP, multiple orthogonal methods\",\n      \"pmids\": [\"32876692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NUCKS1 knockdown in gastric cancer cells induces autophagy through the mTOR-Beclin1 pathway; this autophagy induction is rescued by NUCKS1 restoration, and Beclin1 silencing in NUCKS1-knockdown cells, or rapamycin treatment in NUCKS1-overexpressing cells, confirms NUCKS1 acts upstream of mTOR to suppress Beclin1-dependent autophagy.\",\n      \"method\": \"siRNA knockdown, genetic rescue, rapamycin treatment, Western blotting, autophagy assays, xenograft\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis via multiple genetic/pharmacological perturbations, single lab\",\n      \"pmids\": [\"32958058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NUCKS1 physically interacts with CDK1 (verified by co-immunoprecipitation) and promotes CDK1 expression in NSCLC cells; CDK1 knockdown or inhibition alleviates the pro-proliferative and pro-invasive effects of NUCKS1 overexpression.\",\n      \"method\": \"Co-immunoprecipitation, shRNA knockdown, CDK1 inhibitor, cell proliferation/invasion assays, xenograft\",\n      \"journal\": \"Cancer management and research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus epistasis via CDK1 knockdown rescue, single lab\",\n      \"pmids\": [\"33380837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NUCKS1 functions as a transcription factor that is recruited to chromatin in response to mitogenic stimulation to activate SKP2 expression, leading to degradation of p21 and p27 and S phase entry. DNA damage induces p53-dependent transcriptional repression of NUCKS1, causing SKP2 downregulation, p21/p27 accumulation, and cell cycle arrest (NUCKS1-SKP2-p21/p27 axis).\",\n      \"method\": \"ChIP, siRNA/shRNA knockdown, reporter assay, cell cycle analysis, epistasis by genetic manipulation of each component\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct chromatin recruitment, multiple epistasis experiments, well-defined pathway axis, peer-reviewed\",\n      \"pmids\": [\"34845229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NUCKS1 transcriptionally upregulates asparagine synthetase (ASNS), elevating asparagine levels in osteosarcoma cells to promote proliferation and metastasis; ASNS inhibition or asparagine reduction diminishes the pro-tumorigenic effects of NUCKS1.\",\n      \"method\": \"siRNA knockdown, overexpression, asparagine measurement, ASNS inhibition, xenograft, in vitro functional assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis via ASNS inhibition rescuing NUCKS1 effect, single lab\",\n      \"pmids\": [\"37528150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUCB2 interacts with NUCKS1 protein to inhibit its degradation (stabilization), which in turn allows NUCKS1 to transcriptionally upregulate CXCL8 expression in osteosarcoma, promoting PD-L1 expression and immunosuppression.\",\n      \"method\": \"Co-immunoprecipitation, knockdown, Western blotting, reporter assay, in vivo tumor model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP for interaction, functional epistasis, single lab\",\n      \"pmids\": [\"38636892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NUCKS1 directly binds to the promoter of Cdc42 and transcriptionally upregulates Cdc42 expression in hepatocellular carcinoma, promoting cancer cell proliferation and migration; Cdc42 expression is positively correlated with NUCKS1 in HCC tissues.\",\n      \"method\": \"ChIP (promoter binding), siRNA knockdown, overexpression, in vitro and in vivo functional assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by ChIP plus functional epistasis, single lab\",\n      \"pmids\": [\"40226459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NUCKS1 stabilizes HDAC2 by inhibiting lysosomal degradation, leading to AKT activation and promotion of colorectal cancer invasion and metastasis; HDAC2 inhibition or AKT inhibition rescues the pro-metastatic effects of NUCKS1 overexpression both in vitro and in vivo.\",\n      \"method\": \"Knockdown/overexpression, HDAC2 inhibitor (Santacruzamate A), AKT inhibitor (LY294002), in vivo tail-vein metastasis model, Western blotting\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological and genetic epistasis with in vivo validation, single lab\",\n      \"pmids\": [\"40527876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NUCKS1 directly binds to the promoter of S100A9 and transcriptionally upregulates its expression in HNSCC, enhancing malignancy; NUCKS1 ablation decreases S100A9 promoter activity and expression.\",\n      \"method\": \"Promoter reporter assay, siRNA knockdown, overexpression, in vitro and in vivo functional assays\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter activity assay plus functional epistasis, single lab\",\n      \"pmids\": [\"40946978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DDX21 binds the NUCKS1 promoter and its downregulation reduces NUCKS1 transcription, leading to elevated p21/p27 levels and G0/G1 arrest in dormancy-like colorectal cancer cells; HERC2 mediates K48/K63-linked polyubiquitination and degradation of DDX21, placing DDX21 upstream of NUCKS1 in a HERC2-DDX21-NUCKS1-p21/p27 axis.\",\n      \"method\": \"Proteomics, ChIP (DDX21 binding to NUCKS1 promoter), ubiquitination assay, knockdown/overexpression, cell cycle analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct promoter binding, ubiquitination assay, epistasis, single lab\",\n      \"pmids\": [\"42071007\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUCKS1 is a vertebrate-specific, nuclear chromatin-associated protein that functions as a transcriptional regulator (activating SKP2, insulin receptor, IGF-1R, Cdc42, ASNS, S100A9, and CXCL8 promoters), a DNA damage response factor that promotes homologous recombination by stimulating RAD54 ATPase activity and RAD51-RAD54-mediated strand invasion, and a heavily post-translationally modified substrate of CK2, CDK1, and ATM kinase; its nuclear import is mediated by importin alpha3/alpha5 via a bipartite NLS, and it integrates mitogenic and DNA damage signals at the G1/S transition through the NUCKS1-SKP2-p21/p27 axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NUCKS1 is a vertebrate-specific, chromatin-associated nuclear phosphoprotein that couples mitogenic and DNA-damage signaling to cell-cycle control through dual roles as a chromatin-binding transcriptional regulator and a homologous-recombination repair factor [#5, #7, #16]. Its DNA-binding activity is mediated by a basic GRP-motif domain that inserts into the DNA major groove, and a Cdk1 phosphorylation site within this domain switches DNA binding off, linking its chromatin engagement to cell-cycle kinase activity [#1]. Nuclear import depends on a bipartite NLS that engages importin alpha3/alpha5 [#3], and the protein is one of the most heavily post-translationally modified proteins known, carrying numerous phosphorylation, acetylation, methylation and formylation sites with cell-cycle-dependent dynamics [#4]; phosphorylation is imposed by CK2, CDK1, and the DNA-damage kinases ATM and DNA-PK [#9]. As a transcriptional activator recruited to chromatin upon mitogenic stimulation, NUCKS1 activates SKP2 to drive p21/p27 degradation and S-phase entry, a circuit that is reversed by p53-dependent transcriptional repression of NUCKS1 following DNA damage (the NUCKS1-SKP2-p21/p27 axis) [#16]. In DNA repair, NUCKS1 acts as a RAD51AP1 paralog that binds DNA and stimulates RAD54 ATPase activity and RAD51-RAD54-mediated strand invasion during D-loop formation, promoting homologous recombination, replication fork progression, and suppression of radiation-induced lymphomagenesis [#7, #13, #10]. NUCKS1 also functions as a transcriptional activator of insulin/IGF signaling components, and Nucks1-knockout mice display impaired insulin signaling, obesity, glucose intolerance and insulin resistance, with hypothalamic NUCKS1 governing peripheral glucose homeostasis [#5, #8]. Across multiple cancers NUCKS1 promotes proliferation, invasion and metastasis by transcriptionally upregulating target genes including IGF-1R, ASNS, CXCL8, Cdc42 and S100A9 [#12, #17, #18, #19, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established NUCKS1 as a bona fide nuclear phosphoprotein and Cdk1 substrate, defining the first molecular handle on a cell-cycle-linked function.\",\n      \"evidence\": \"Phosphopeptide mapping and back-phosphorylation of HeLa interphase versus metaphase protein\",\n      \"pmids\": [\"11298763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of mitotic phosphorylation not defined\", \"No DNA-binding or transcriptional role established yet\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified the DNA-binding determinant and showed it is regulated by Cdk1 phosphorylation, connecting kinase modification to chromatin engagement.\",\n      \"evidence\": \"Synthetic peptide DNA-binding assays, NMR, docking, and in vitro phosphorylation\",\n      \"pmids\": [\"12413487\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro peptide model rather than full-length protein in cells\", \"Sequence specificity of DNA binding not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated vertebrate conservation of NUCKS1 as a CDK1/CK2 substrate and characterized its promoter architecture.\",\n      \"evidence\": \"In vitro kinase assays on fish ortholog, immunoblotting, database analysis\",\n      \"pmids\": [\"15381070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No invertebrate ortholog characterized\", \"Functional role still undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the nuclear import mechanism, showing a bipartite NLS drives receptor-mediated import via importin alpha3/alpha5.\",\n      \"evidence\": \"GFP-fusion localization, mutagenesis, pull-down, splice-variant analysis\",\n      \"pmids\": [\"17604136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of import during cell cycle not addressed\", \"Function of NLS2 not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the extraordinary PTM landscape of NUCKS1 with cell-cycle-dependent dynamics, framing it as a heavily regulated signaling hub.\",\n      \"evidence\": \"SILAC quantitative proteomics and mass spectrometry across cell-cycle states\",\n      \"pmids\": [\"18491381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of most individual PTMs unknown\", \"Responsible enzymes for many sites unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed NUCKS1 as a transcriptional activator of insulin-signaling genes with a defined whole-animal metabolic phenotype.\",\n      \"evidence\": \"ChIP-seq plus Nucks1-knockout mice with glucose/insulin tolerance testing\",\n      \"pmids\": [\"24931609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA-binding specificity of NUCKS1 at these promoters not resolved\", \"Cofactors mediating Pol II recruitment unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed NUCKS1 acts as a host coactivator of HIV-1 Tat, extending its transcriptional regulatory role to viral chromatin.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-IP, ChIP at the HIV-1 LTR, reporter and knockdown assays\",\n      \"pmids\": [\"25116364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, mechanism of Tat stabilization at TAR unresolved\", \"Direct versus indirect chromatin recruitment unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established NUCKS1 as a RAD51AP1 paralog functioning in homologous recombination and replication, defining its genome-stability role.\",\n      \"evidence\": \"siRNA knockdown HR assays, DNA fiber, MMC sensitivity, recombinant DNA-binding assays\",\n      \"pmids\": [\"26323318\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic step within HR not yet defined\", \"Lower DNA-binding affinity than RAD51AP1 implies distinct mode\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Localized the metabolic function to hypothalamic NUCKS1, showing tissue specificity of its insulin/glucose control.\",\n      \"evidence\": \"Conditional Nkx2.1-Cre and immune-cell-specific knockouts with metabolic phenotyping\",\n      \"pmids\": [\"26205492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hypothalamic neuronal target genes not mapped\", \"Link to central insulin action mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified the kinases imposing NUCKS1 phosphorylation and linked ATM/DNA-PK modification to the DNA-damage response.\",\n      \"evidence\": \"In vitro/in vivo kinase assays, MS, phosphospecific antibodies, inhibitors, irradiation\",\n      \"pmids\": [\"28011258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of ATM phosphorylation on HR not directly shown\", \"Downstream effectors of CK2 sites unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided in vivo genetic evidence that NUCKS1 suppresses radiation-induced tumorigenesis, consistent with a DNA-damage-response tumor-suppressor role.\",\n      \"evidence\": \"Trp53+/- Nucks1+/- compound mutant mice, irradiation, tumor and LOH analysis\",\n      \"pmids\": [\"27542204\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab haploinsufficiency model\", \"Mechanistic link to HR defect in vivo not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended NUCKS1 function to NF-kB-driven inflammatory cytokine expression in an in vivo injury model.\",\n      \"evidence\": \"Nucks1-knockout mice, corneal alkali burn, LPS-NF-kB assays, cytokine profiling\",\n      \"pmids\": [\"28106169\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect effect on NF-kB unclear\", \"No chromatin-level mechanism at cytokine promoters\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved the biochemical step NUCKS1 performs in HR, showing it stimulates RAD54 ATPase and RAD51-RAD54 strand invasion.\",\n      \"evidence\": \"Co-IP, reconstituted ATPase and D-loop assays, focus resolution in cells\",\n      \"pmids\": [\"32876692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of RAD54 stimulation not determined\", \"Regulation of the NUCKS1/RAD51AP1 partner choice unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined the NUCKS1-SKP2-p21/p27 axis integrating mitogenic and p53-dependent DNA-damage signals at the G1/S transition.\",\n      \"evidence\": \"ChIP, knockdown, reporter assays, cell-cycle analysis, multi-component epistasis\",\n      \"pmids\": [\"34845229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DNA sequence motif bound by NUCKS1 at SKP2 not defined\", \"Coactivator machinery at SKP2 promoter unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed that NUCKS1 drives diverse oncogenic programs by transcriptionally upregulating effector genes and stabilizing protumorigenic proteins across cancer types.\",\n      \"evidence\": \"ChIP/promoter reporter and epistasis for IGF-1R, ASNS, CXCL8, Cdc42, S100A9, plus HDAC2 stabilization; xenograft and metastasis models\",\n      \"pmids\": [\"30371738\", \"37528150\", \"38636892\", \"40226459\", \"40527876\", \"40946978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each target characterized in a single tumor context by a single lab\", \"Direct DNA-binding specificity across these promoters not unified\", \"Mechanism of protein stabilization (HDAC2, via NUCB2) incompletely defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Placed NUCKS1 downstream of a HERC2-DDX21 module that controls its transcription to govern cancer-cell dormancy via p21/p27.\",\n      \"evidence\": \"Proteomics, ChIP of DDX21 at the NUCKS1 promoter, ubiquitination assays, cell-cycle analysis\",\n      \"pmids\": [\"42071007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Generality beyond dormancy-like colorectal cells unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NUCKS1's chromatin-binding mode achieves promoter selectivity, and how its many PTMs coordinate the switch between transcriptional regulation and HR repair, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No consensus DNA-binding motif defined despite many direct promoter targets\", \"No structural model of NUCKS1 on chromatin or in the RAD54 complex\", \"PTM code that toggles transcription versus repair function not deciphered\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 16, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [16, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [7, 13]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAD54\", \"RAD51AP1\", \"CDK1\", \"NUCB2\", \"Tat (HIV-1)\", \"importin alpha3\", \"importin alpha5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}