{"gene":"CSNK1D","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2005,"finding":"A missense mutation T44A in CKIdelta decreases its enzymatic activity in vitro, and transgenic mice carrying this mutation show a shorter circadian period (mimicking human FASPS), establishing CKIdelta as a central component of the mammalian circadian clock.","method":"In vitro kinase activity assay of mutant CKIdelta-T44A; transgenic mouse and Drosophila models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic assay combined with transgenic animal models in two species, replicated functional consequence","pmids":["15800623"],"is_preprint":false},{"year":2002,"finding":"CKIdelta (and CKIepsilon) phosphorylate mPer1 and mPer3, leading to their rapid ubiquitin-proteasome-dependent degradation and nuclear translocation; mutation of phosphorylation sites on mPer3 reduced both CKI-stimulated nuclear translocation and degradation, while CKI had no effect on mCry-mediated transcriptional inhibition.","method":"Cell-based phosphorylation and degradation assays; ubiquitin-proteasome pathway inhibition; site-directed mutagenesis of mPer3 phosphorylation sites; nuclear translocation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (degradation assays, mutagenesis, localization) in cultured cells with functional readouts","pmids":["11865049"],"is_preprint":false},{"year":2009,"finding":"CKIdelta and CKIepsilon are essential kinases for mammalian circadian rhythm generation: CKIdelta-deficient MEFs showed longer circadian period (compensated), but simultaneous disruption of both CKIdelta and CKIepsilon abolished circadian rhythms and severely compromised PER abundance and phosphorylation. Disruption of the physical interaction between PER2 and CKIdelta/epsilon (via CKBD-P2 overexpression) also abolished rhythms and dramatically lowered PER levels, suggesting a non-catalytic stabilizing role for CKIdelta/epsilon on PER.","method":"CKIdelta-knockout MEFs; dominant-negative CKIepsilon overexpression; overexpression of CKIdelta/epsilon-binding domain of PER2 (CKBD-P2); bioluminescence circadian rhythm assays; endogenous PER abundance and phosphorylation analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function combined with dominant-negative and competitive binding approaches, multiple orthogonal readouts in mammalian cells","pmids":["19948962"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, the CSNK1D ortholog DOUBLETIME (DBT) is translationally regulated by the RNA-binding protein LARK (mammalian RBM4), which promotes translation of specific alternative dbt transcripts in clock cells; altered LARK abundance affects circadian period length in a dbt allele-dependent manner, and increased LARK delays nuclear degradation of the PERIOD clock protein.","method":"Genetic interaction (dbt allele modifiers of LARK period phenotype); translation assays of alternative dbt transcripts; free-running bioluminescence and behavioral period assays in Drosophila","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and translational reporter assays in Drosophila ortholog, single lab","pmids":["25211129"],"is_preprint":false},{"year":2003,"finding":"CKIdelta kinase activity increases in lymphocytes upon mitogenic stimulation and decreases upon gamma-irradiation; CKIdelta activity is higher in p53+/+ than p53-/- lymphocytes, and elevated CKIdelta immunostaining is observed in hyperplastic B follicles and B-cell lymphomas in p53-deficient mice, indicating a role for CKIdelta in lymphocyte physiology linked to p53 status.","method":"Kinase activity assays in isolated lymphocytes and granulocytes; immunohistochemistry in spleen; comparison of p53+/+ vs p53-/- mice","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct kinase activity measurements with multiple conditions (mitogen, irradiation, p53 status), single lab","pmids":["12924632"],"is_preprint":false},{"year":2023,"finding":"CSNK1D phosphorylates HNRNPA2B1 to enhance its stability; HNRNPA2B1 then recognizes pri-miR-25/93 through m6A-dependent recognition and promotes maturation of miR-25-3p and miR-93-5p, which activate TGF-β and inactivate FOXO pathways to drive prostate cancer progression.","method":"Mass spectrometry identification of CSNK1D-HNRNPA2B1 interaction; phosphorylation assays; in vitro and in vivo (xenograft) functional experiments; m6A-dependent RNA binding assays","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — MS-identified interaction with mechanistic follow-up (phosphorylation, miRNA processing, pathway activation), single lab","pmids":["37208565"],"is_preprint":false},{"year":2022,"finding":"CSNK1D promotes hepatocellular carcinoma progression by interacting with Dishevelled Segment Polarity Protein 3 (DVL3) to stabilize it and activate Wnt/β-catenin signaling; silencing CSNK1D reduced proliferation, invasion, sorafenib resistance, and xenograft tumor growth.","method":"Co-immunoprecipitation/interaction assays; siRNA knockdown and overexpression in HCC cells; xenograft assay; western blot for β-catenin pathway components","journal":"Biological procedures online","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — interaction assay plus multiple cellular and in vivo phenotype readouts, single lab","pmids":["36460966"],"is_preprint":false},{"year":2025,"finding":"CSNK1D selectively binds SHH and PTCH1 and regulates the stability of the CSNK1D-SHH-PTCH1 complex to control the GLI1-BCL2 axis, activating the Hedgehog pathway in head and neck squamous cell carcinoma cells; CSNK1D inhibition by SB-203580 suppresses HNSCC progression.","method":"Co-immunoprecipitation/binding assays; siRNA knockdown and overexpression; pharmacological inhibition with SB-203580; western blot for GLI1/BCL2 pathway","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — binding assay with functional pathway readouts, single lab, single study","pmids":["41353440"],"is_preprint":false},{"year":2024,"finding":"CSNK1D expression is upregulated during osteoclast differentiation in RAW264.7 cells; siRNA-mediated knockdown of CSNK1D reduced osteoclast marker expression and TRAP+ cell formation in vitro, and CSNK1D expression is associated with bone loss in an ovariectomy-induced rat osteoporosis model.","method":"siRNA knockdown in RAW264.7 osteoclast differentiation assay; TRAP staining; in vivo ovariectomy rat model","journal":"Experimental physiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, knockdown phenotype without defined molecular mechanism or binding partner","pmids":["39612374"],"is_preprint":false},{"year":1996,"finding":"Human CSNK1D cDNA encodes a 415-amino-acid protein 97% homologous to rat CKI delta, with a kinase domain identical to rat CKI delta; the gene maps to chromosome 17q25.2-q25.3.","method":"cDNA sequencing; FISH and PCR on human/rodent hybrid cell panels for chromosomal mapping","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — direct experimental identification of the human gene sequence and chromosomal location, replicated by later studies","pmids":["8786104"],"is_preprint":false}],"current_model":"CSNK1D (CKIdelta) is a serine/threonine kinase that functions as an essential component of the mammalian circadian clock by phosphorylating PER proteins to regulate their ubiquitin-proteasome-dependent degradation and nuclear translocation, and also plays non-catalytic roles in stabilizing PER; beyond circadian regulation, it phosphorylates substrates including HNRNPA2B1 (enhancing its stability to promote miRNA maturation and cancer progression), interacts with DVL3 to activate Wnt/β-catenin signaling in HCC, and binds the SHH-PTCH1 complex to activate the Hedgehog/GLI1 axis in HNSCC, implicating it in multiple oncogenic pathways."},"narrative":{"mechanistic_narrative":"CSNK1D (CKIdelta) is a serine/threonine kinase that functions as a core component of the mammalian circadian clock by phosphorylating PERIOD proteins to control their stability and subcellular distribution [PMID:15800623, PMID:11865049]. It phosphorylates mPer1 and mPer3 to drive their ubiquitin-proteasome-dependent degradation and nuclear translocation, while having no effect on CRY-mediated transcriptional inhibition [PMID:11865049]; a period-shortening T44A mutation that reduces kinase activity recapitulates a human familial advanced sleep phase phenotype in transgenic animals, establishing its central clock role [PMID:15800623]. CKIdelta acts redundantly with CKIepsilon, since loss of both kinases—or competitive disruption of the PER2–kinase interaction—abolishes rhythms and depletes PER, revealing a non-catalytic PER-stabilizing function in addition to its catalytic one [PMID:19948962]. Beyond the clock, CSNK1D has been implicated in several oncogenic axes: it phosphorylates and stabilizes HNRNPA2B1 to promote m6A-dependent maturation of miR-25-3p/miR-93-5p driving prostate cancer progression [PMID:37208565], interacts with and stabilizes DVL3 to activate Wnt/β-catenin signaling in hepatocellular carcinoma [PMID:36460966], and binds the SHH–PTCH1 complex to control the GLI1–BCL2 Hedgehog axis in head and neck squamous cell carcinoma [PMID:41353440]. Earlier work also linked CKIdelta kinase activity to lymphocyte mitogenic responses and p53 status [PMID:12924632].","teleology":[{"year":1996,"claim":"Establishing the human gene sequence and locus was the prerequisite for studying CKIdelta in human biology and disease.","evidence":"cDNA sequencing and FISH/PCR chromosomal mapping of human CSNK1D","pmids":["8786104"],"confidence":"Medium","gaps":["No functional or substrate information beyond sequence homology","Does not address tissue-specific expression or activity"]},{"year":2002,"claim":"Identifying PER proteins as CKIdelta substrates answered how the kinase couples to clock output by linking phosphorylation to PER degradation and nuclear translocation.","evidence":"Cell-based phosphorylation/degradation assays, proteasome inhibition, and site-directed mutagenesis of mPer3 phosphosites","pmids":["11865049"],"confidence":"High","gaps":["Did not determine in vivo physiological consequence of PER phosphorylation","Specific phosphosites driving each readout not fully mapped"]},{"year":2003,"claim":"Linking CKIdelta activity to mitogenic stimulation, irradiation, and p53 status raised a role outside the clock in lymphocyte physiology and tumorigenesis.","evidence":"Kinase activity assays in lymphocytes/granulocytes and immunohistochemistry comparing p53+/+ and p53-/- mice","pmids":["12924632"],"confidence":"Medium","gaps":["No direct substrate identified in this context","Mechanistic connection between CKIdelta activity and p53 unresolved"]},{"year":2005,"claim":"A kinase-impairing mutation that shortens circadian period in vivo established CKIdelta as a causal clock component and a model for human sleep phase phenotypes.","evidence":"In vitro kinase assay of CKIdelta-T44A plus transgenic mouse and Drosophila models","pmids":["15800623"],"confidence":"High","gaps":["Direct causative link to human FASPS is by phenotypic mimicry, not human genetics in this study","Structural basis of reduced activity not defined"]},{"year":2009,"claim":"Genetic loss-of-function and binding-disruption experiments distinguished catalytic from non-catalytic roles, showing CKIdelta both phosphorylates and physically stabilizes PER and acts redundantly with CKIepsilon.","evidence":"CKIdelta-knockout MEFs, dominant-negative CKIepsilon, CKBD-P2 competitive binding, and bioluminescence rhythm assays","pmids":["19948962"],"confidence":"High","gaps":["Molecular mechanism of the non-catalytic stabilizing role unresolved","Quantitative contribution of each kinase in different tissues unknown"]},{"year":2014,"claim":"Demonstrating translational control of the Drosophila ortholog DBT by LARK/RBM4 showed that kinase abundance, not only activity, tunes clock period.","evidence":"Genetic epistasis, alternative-transcript translation assays, and behavioral period assays in Drosophila","pmids":["25211129"],"confidence":"Medium","gaps":["Conservation of LARK/RBM4 translational regulation in mammalian CSNK1D not established","Single lab, ortholog-based"]},{"year":2022,"claim":"Identifying a CSNK1D-DVL3 interaction connected the kinase to Wnt/β-catenin-driven hepatocellular carcinoma progression and drug resistance.","evidence":"Co-IP, siRNA/overexpression in HCC cells, xenograft growth, and β-catenin pathway western blots","pmids":["36460966"],"confidence":"Medium","gaps":["Whether DVL3 stabilization requires CSNK1D catalytic activity not resolved","Single lab without reciprocal interaction validation across systems"]},{"year":2023,"claim":"Showing CSNK1D phosphorylates and stabilizes HNRNPA2B1 linked the kinase to m6A-dependent miRNA maturation as an oncogenic mechanism in prostate cancer.","evidence":"Mass spectrometry interaction mapping, phosphorylation and m6A RNA-binding assays, plus xenograft experiments","pmids":["37208565"],"confidence":"Medium","gaps":["Phosphosites on HNRNPA2B1 not defined","Generality beyond prostate cancer untested"]},{"year":2025,"claim":"Identifying CSNK1D binding to the SHH-PTCH1 complex implicated it in Hedgehog/GLI1-BCL2 signaling in head and neck squamous cell carcinoma.","evidence":"Co-IP binding assays, siRNA/overexpression, pharmacological inhibition (SB-203580), and GLI1/BCL2 western blots","pmids":["41353440"],"confidence":"Medium","gaps":["Whether complex regulation depends on kinase activity vs scaffolding unresolved","Single study; direct phosphorylation of complex components not shown"]},{"year":null,"claim":"How CSNK1D's circadian and oncogenic functions are mechanistically unified—and whether its catalytic versus non-catalytic activities are differentially deployed across these contexts—remains unresolved.","evidence":"No timeline discovery directly integrates the clock and cancer roles","pmids":[],"confidence":"Low","gaps":["No structural model linking substrate selectivity across pathways","Regulation of CSNK1D activity in tumor contexts undefined","Catalytic dependence of cancer interactions not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,5]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,5]}],"localization":[],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,6,7]}],"complexes":[],"partners":["PER2","PER1","PER3","CSNK1E","HNRNPA2B1","DVL3","SHH","PTCH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P48730","full_name":"Casein kinase I isoform delta","aliases":["Tau-protein kinase CSNK1D"],"length_aa":415,"mass_kda":47.3,"function":"Essential serine/threonine-protein kinase that regulates diverse cellular growth and survival processes including Wnt signaling, DNA repair and circadian rhythms. It can phosphorylate a large number of proteins. Casein kinases are operationally defined by their preferential utilization of acidic proteins such as caseins as substrates. Phosphorylates connexin-43/GJA1, MAP1A, SNAPIN, MAPT/TAU, TOP2A, DCK, HIF1A, EIF6, p53/TP53, DVL2, DVL3, ESR1, AIB1/NCOA3, DNMT1, PKD2, YAP1, PER1 and PER2. Central component of the circadian clock. In balance with PP1, determines the circadian period length through the regulation of the speed and rhythmicity of PER1 and PER2 phosphorylation. Controls PER1 and PER2 nuclear transport and degradation. YAP1 phosphorylation promotes its SCF(beta-TRCP) E3 ubiquitin ligase-mediated ubiquitination and subsequent degradation. DNMT1 phosphorylation reduces its DNA-binding activity. Phosphorylation of ESR1 and AIB1/NCOA3 stimulates their activity and coactivation. Phosphorylation of DVL2 and DVL3 regulates WNT3A signaling pathway that controls neurite outgrowth. Phosphorylates NEDD9/HEF1 (By similarity). EIF6 phosphorylation promotes its nuclear export. Triggers down-regulation of dopamine receptors in the forebrain. Activates DCK in vitro by phosphorylation. TOP2A phosphorylation favors DNA cleavable complex formation. May regulate the formation of the mitotic spindle apparatus in extravillous trophoblast. Modulates connexin-43/GJA1 gap junction assembly by phosphorylation. Probably involved in lymphocyte physiology. Regulates fast synaptic transmission mediated by glutamate","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, perinuclear region; Cell membrane; Cytoplasm, cytoskeleton, spindle; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/P48730/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CSNK1D","classification":"Not Classified","n_dependent_lines":36,"n_total_lines":1208,"dependency_fraction":0.029801324503311258},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000141551","cell_line_id":"CID001162","localizations":[{"compartment":"centrosome","grade":3},{"compartment":"cytoplasmic","grade":1},{"compartment":"membrane","grade":1},{"compartment":"nucleoplasm","grade":1}],"interactors":[{"gene":"CSNK1E;CSNK1D","stoichiometry":10.0},{"gene":"GAPVD1","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001162","total_profiled":1310},"omim":[{"mim_id":"621522","title":"SCAFFOLDING CK1-ANCHORING PROTEIN F; SACK1F","url":"https://www.omim.org/entry/621522"},{"mim_id":"621521","title":"SCAFFOLDING CK1-ANCHORING PROTEIN E; SACK1E","url":"https://www.omim.org/entry/621521"},{"mim_id":"621520","title":"SCAFFOLDING CK1-ANCHORING PROTEIN C; SACK1C","url":"https://www.omim.org/entry/621520"},{"mim_id":"621519","title":"SCAFFOLDING CK1-ANCHORING PROTEIN B; SACK1B","url":"https://www.omim.org/entry/621519"},{"mim_id":"621022","title":"SCAFFOLDING CK1-ANCHORING PROTEIN A; SACK1A","url":"https://www.omim.org/entry/621022"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Actin filaments","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"},{"location":"End piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CSNK1D"},"hgnc":{"alias_symbol":["HCKID","CKID","CKIdelta"],"prev_symbol":[]},"alphafold":{"accession":"P48730","domains":[{"cath_id":"3.30.200.20","chopping":"14-25_36-82","consensus_level":"high","plddt":92.8419,"start":14,"end":82},{"cath_id":"1.10.510.10","chopping":"86-290","consensus_level":"high","plddt":97.735,"start":86,"end":290}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P48730","model_url":"https://alphafold.ebi.ac.uk/files/AF-P48730-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P48730-F1-predicted_aligned_error_v6.png","plddt_mean":81.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CSNK1D","jax_strain_url":"https://www.jax.org/strain/search?query=CSNK1D"},"sequence":{"accession":"P48730","fasta_url":"https://rest.uniprot.org/uniprotkb/P48730.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P48730/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P48730"}},"corpus_meta":[{"pmid":"15800623","id":"PMC_15800623","title":"Functional 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pulmonary venous return.","date":"2025","source":"Taiwanese journal of obstetrics & gynecology","url":"https://pubmed.ncbi.nlm.nih.gov/40049823","citation_count":1,"is_preprint":false},{"pmid":"41353440","id":"PMC_41353440","title":"CSNK1D inhibition suppresses head and neck squamous cell carcinoma progression through SHH and PTCH1 pathway.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41353440","citation_count":0,"is_preprint":false},{"pmid":"38781585","id":"PMC_38781585","title":"Identification of CSNK1D and KLK6 as two common upregulated genes present in BRCA1 mutated triple-negative breast cancer and ovarian epithelial carcinoma.","date":"2024","source":"Nucleosides, nucleotides & nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/38781585","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.15.633123","title":"An evolutionarily conserved microRNA, miR-185, regulates key pathways that may contribute to implantation failure.","date":"2025-01-15","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.15.633123","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16902,"output_tokens":2655,"usd":0.045266,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9899,"output_tokens":3058,"usd":0.062973,"stage2_stop_reason":"end_turn"},"total_usd":0.108239,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"A missense mutation T44A in CKIdelta decreases its enzymatic activity in vitro, and transgenic mice carrying this mutation show a shorter circadian period (mimicking human FASPS), establishing CKIdelta as a central component of the mammalian circadian clock.\",\n      \"method\": \"In vitro kinase activity assay of mutant CKIdelta-T44A; transgenic mouse and Drosophila models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic assay combined with transgenic animal models in two species, replicated functional consequence\",\n      \"pmids\": [\"15800623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CKIdelta (and CKIepsilon) phosphorylate mPer1 and mPer3, leading to their rapid ubiquitin-proteasome-dependent degradation and nuclear translocation; mutation of phosphorylation sites on mPer3 reduced both CKI-stimulated nuclear translocation and degradation, while CKI had no effect on mCry-mediated transcriptional inhibition.\",\n      \"method\": \"Cell-based phosphorylation and degradation assays; ubiquitin-proteasome pathway inhibition; site-directed mutagenesis of mPer3 phosphorylation sites; nuclear translocation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (degradation assays, mutagenesis, localization) in cultured cells with functional readouts\",\n      \"pmids\": [\"11865049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CKIdelta and CKIepsilon are essential kinases for mammalian circadian rhythm generation: CKIdelta-deficient MEFs showed longer circadian period (compensated), but simultaneous disruption of both CKIdelta and CKIepsilon abolished circadian rhythms and severely compromised PER abundance and phosphorylation. Disruption of the physical interaction between PER2 and CKIdelta/epsilon (via CKBD-P2 overexpression) also abolished rhythms and dramatically lowered PER levels, suggesting a non-catalytic stabilizing role for CKIdelta/epsilon on PER.\",\n      \"method\": \"CKIdelta-knockout MEFs; dominant-negative CKIepsilon overexpression; overexpression of CKIdelta/epsilon-binding domain of PER2 (CKBD-P2); bioluminescence circadian rhythm assays; endogenous PER abundance and phosphorylation analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function combined with dominant-negative and competitive binding approaches, multiple orthogonal readouts in mammalian cells\",\n      \"pmids\": [\"19948962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, the CSNK1D ortholog DOUBLETIME (DBT) is translationally regulated by the RNA-binding protein LARK (mammalian RBM4), which promotes translation of specific alternative dbt transcripts in clock cells; altered LARK abundance affects circadian period length in a dbt allele-dependent manner, and increased LARK delays nuclear degradation of the PERIOD clock protein.\",\n      \"method\": \"Genetic interaction (dbt allele modifiers of LARK period phenotype); translation assays of alternative dbt transcripts; free-running bioluminescence and behavioral period assays in Drosophila\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and translational reporter assays in Drosophila ortholog, single lab\",\n      \"pmids\": [\"25211129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CKIdelta kinase activity increases in lymphocytes upon mitogenic stimulation and decreases upon gamma-irradiation; CKIdelta activity is higher in p53+/+ than p53-/- lymphocytes, and elevated CKIdelta immunostaining is observed in hyperplastic B follicles and B-cell lymphomas in p53-deficient mice, indicating a role for CKIdelta in lymphocyte physiology linked to p53 status.\",\n      \"method\": \"Kinase activity assays in isolated lymphocytes and granulocytes; immunohistochemistry in spleen; comparison of p53+/+ vs p53-/- mice\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct kinase activity measurements with multiple conditions (mitogen, irradiation, p53 status), single lab\",\n      \"pmids\": [\"12924632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CSNK1D phosphorylates HNRNPA2B1 to enhance its stability; HNRNPA2B1 then recognizes pri-miR-25/93 through m6A-dependent recognition and promotes maturation of miR-25-3p and miR-93-5p, which activate TGF-β and inactivate FOXO pathways to drive prostate cancer progression.\",\n      \"method\": \"Mass spectrometry identification of CSNK1D-HNRNPA2B1 interaction; phosphorylation assays; in vitro and in vivo (xenograft) functional experiments; m6A-dependent RNA binding assays\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — MS-identified interaction with mechanistic follow-up (phosphorylation, miRNA processing, pathway activation), single lab\",\n      \"pmids\": [\"37208565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CSNK1D promotes hepatocellular carcinoma progression by interacting with Dishevelled Segment Polarity Protein 3 (DVL3) to stabilize it and activate Wnt/β-catenin signaling; silencing CSNK1D reduced proliferation, invasion, sorafenib resistance, and xenograft tumor growth.\",\n      \"method\": \"Co-immunoprecipitation/interaction assays; siRNA knockdown and overexpression in HCC cells; xenograft assay; western blot for β-catenin pathway components\",\n      \"journal\": \"Biological procedures online\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — interaction assay plus multiple cellular and in vivo phenotype readouts, single lab\",\n      \"pmids\": [\"36460966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CSNK1D selectively binds SHH and PTCH1 and regulates the stability of the CSNK1D-SHH-PTCH1 complex to control the GLI1-BCL2 axis, activating the Hedgehog pathway in head and neck squamous cell carcinoma cells; CSNK1D inhibition by SB-203580 suppresses HNSCC progression.\",\n      \"method\": \"Co-immunoprecipitation/binding assays; siRNA knockdown and overexpression; pharmacological inhibition with SB-203580; western blot for GLI1/BCL2 pathway\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — binding assay with functional pathway readouts, single lab, single study\",\n      \"pmids\": [\"41353440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CSNK1D expression is upregulated during osteoclast differentiation in RAW264.7 cells; siRNA-mediated knockdown of CSNK1D reduced osteoclast marker expression and TRAP+ cell formation in vitro, and CSNK1D expression is associated with bone loss in an ovariectomy-induced rat osteoporosis model.\",\n      \"method\": \"siRNA knockdown in RAW264.7 osteoclast differentiation assay; TRAP staining; in vivo ovariectomy rat model\",\n      \"journal\": \"Experimental physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, knockdown phenotype without defined molecular mechanism or binding partner\",\n      \"pmids\": [\"39612374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Human CSNK1D cDNA encodes a 415-amino-acid protein 97% homologous to rat CKI delta, with a kinase domain identical to rat CKI delta; the gene maps to chromosome 17q25.2-q25.3.\",\n      \"method\": \"cDNA sequencing; FISH and PCR on human/rodent hybrid cell panels for chromosomal mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct experimental identification of the human gene sequence and chromosomal location, replicated by later studies\",\n      \"pmids\": [\"8786104\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CSNK1D (CKIdelta) is a serine/threonine kinase that functions as an essential component of the mammalian circadian clock by phosphorylating PER proteins to regulate their ubiquitin-proteasome-dependent degradation and nuclear translocation, and also plays non-catalytic roles in stabilizing PER; beyond circadian regulation, it phosphorylates substrates including HNRNPA2B1 (enhancing its stability to promote miRNA maturation and cancer progression), interacts with DVL3 to activate Wnt/β-catenin signaling in HCC, and binds the SHH-PTCH1 complex to activate the Hedgehog/GLI1 axis in HNSCC, implicating it in multiple oncogenic pathways.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CSNK1D (CKIdelta) is a serine/threonine kinase that functions as a core component of the mammalian circadian clock by phosphorylating PERIOD proteins to control their stability and subcellular distribution [#0, #1]. It phosphorylates mPer1 and mPer3 to drive their ubiquitin-proteasome-dependent degradation and nuclear translocation, while having no effect on CRY-mediated transcriptional inhibition [#1]; a period-shortening T44A mutation that reduces kinase activity recapitulates a human familial advanced sleep phase phenotype in transgenic animals, establishing its central clock role [#0]. CKIdelta acts redundantly with CKIepsilon, since loss of both kinases—or competitive disruption of the PER2–kinase interaction—abolishes rhythms and depletes PER, revealing a non-catalytic PER-stabilizing function in addition to its catalytic one [#2]. Beyond the clock, CSNK1D has been implicated in several oncogenic axes: it phosphorylates and stabilizes HNRNPA2B1 to promote m6A-dependent maturation of miR-25-3p/miR-93-5p driving prostate cancer progression [#5], interacts with and stabilizes DVL3 to activate Wnt/β-catenin signaling in hepatocellular carcinoma [#6], and binds the SHH–PTCH1 complex to control the GLI1–BCL2 Hedgehog axis in head and neck squamous cell carcinoma [#7]. Earlier work also linked CKIdelta kinase activity to lymphocyte mitogenic responses and p53 status [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the human gene sequence and locus was the prerequisite for studying CKIdelta in human biology and disease.\",\n      \"evidence\": \"cDNA sequencing and FISH/PCR chromosomal mapping of human CSNK1D\",\n      \"pmids\": [\"8786104\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional or substrate information beyond sequence homology\", \"Does not address tissue-specific expression or activity\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying PER proteins as CKIdelta substrates answered how the kinase couples to clock output by linking phosphorylation to PER degradation and nuclear translocation.\",\n      \"evidence\": \"Cell-based phosphorylation/degradation assays, proteasome inhibition, and site-directed mutagenesis of mPer3 phosphosites\",\n      \"pmids\": [\"11865049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine in vivo physiological consequence of PER phosphorylation\", \"Specific phosphosites driving each readout not fully mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linking CKIdelta activity to mitogenic stimulation, irradiation, and p53 status raised a role outside the clock in lymphocyte physiology and tumorigenesis.\",\n      \"evidence\": \"Kinase activity assays in lymphocytes/granulocytes and immunohistochemistry comparing p53+/+ and p53-/- mice\",\n      \"pmids\": [\"12924632\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct substrate identified in this context\", \"Mechanistic connection between CKIdelta activity and p53 unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"A kinase-impairing mutation that shortens circadian period in vivo established CKIdelta as a causal clock component and a model for human sleep phase phenotypes.\",\n      \"evidence\": \"In vitro kinase assay of CKIdelta-T44A plus transgenic mouse and Drosophila models\",\n      \"pmids\": [\"15800623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct causative link to human FASPS is by phenotypic mimicry, not human genetics in this study\", \"Structural basis of reduced activity not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Genetic loss-of-function and binding-disruption experiments distinguished catalytic from non-catalytic roles, showing CKIdelta both phosphorylates and physically stabilizes PER and acts redundantly with CKIepsilon.\",\n      \"evidence\": \"CKIdelta-knockout MEFs, dominant-negative CKIepsilon, CKBD-P2 competitive binding, and bioluminescence rhythm assays\",\n      \"pmids\": [\"19948962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of the non-catalytic stabilizing role unresolved\", \"Quantitative contribution of each kinase in different tissues unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating translational control of the Drosophila ortholog DBT by LARK/RBM4 showed that kinase abundance, not only activity, tunes clock period.\",\n      \"evidence\": \"Genetic epistasis, alternative-transcript translation assays, and behavioral period assays in Drosophila\",\n      \"pmids\": [\"25211129\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conservation of LARK/RBM4 translational regulation in mammalian CSNK1D not established\", \"Single lab, ortholog-based\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying a CSNK1D-DVL3 interaction connected the kinase to Wnt/β-catenin-driven hepatocellular carcinoma progression and drug resistance.\",\n      \"evidence\": \"Co-IP, siRNA/overexpression in HCC cells, xenograft growth, and β-catenin pathway western blots\",\n      \"pmids\": [\"36460966\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DVL3 stabilization requires CSNK1D catalytic activity not resolved\", \"Single lab without reciprocal interaction validation across systems\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing CSNK1D phosphorylates and stabilizes HNRNPA2B1 linked the kinase to m6A-dependent miRNA maturation as an oncogenic mechanism in prostate cancer.\",\n      \"evidence\": \"Mass spectrometry interaction mapping, phosphorylation and m6A RNA-binding assays, plus xenograft experiments\",\n      \"pmids\": [\"37208565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphosites on HNRNPA2B1 not defined\", \"Generality beyond prostate cancer untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying CSNK1D binding to the SHH-PTCH1 complex implicated it in Hedgehog/GLI1-BCL2 signaling in head and neck squamous cell carcinoma.\",\n      \"evidence\": \"Co-IP binding assays, siRNA/overexpression, pharmacological inhibition (SB-203580), and GLI1/BCL2 western blots\",\n      \"pmids\": [\"41353440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether complex regulation depends on kinase activity vs scaffolding unresolved\", \"Single study; direct phosphorylation of complex components not shown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CSNK1D's circadian and oncogenic functions are mechanistically unified—and whether its catalytic versus non-catalytic activities are differentially deployed across these contexts—remains unresolved.\",\n      \"evidence\": \"No timeline discovery directly integrates the clock and cancer roles\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model linking substrate selectivity across pathways\", \"Regulation of CSNK1D activity in tumor contexts undefined\", \"Catalytic dependence of cancer interactions not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 5]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 6, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PER2\", \"PER1\", \"PER3\", \"CSNK1E\", \"HNRNPA2B1\", \"DVL3\", \"SHH\", \"PTCH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}