{"gene":"CSNK1G3","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1995,"finding":"CK1γ3 (CSNK1G3) was molecularly cloned from rat testis as one of three members of the CK1 gamma subfamily. The recombinant protein expressed in E. coli was shown to be an active kinase that phosphorylates canonical CK1 substrates (casein, phosvitin, and the synthetic peptide D4), undergoes autophosphorylation in the presence of ATP and Mg2+, and is inhibited by the CK1 inhibitor CK1-7. CK1γ3 mRNA was detected in brain, heart, kidney, lung, liver, and muscle. Expression of CK1γ1 or CK1γ3 complemented defects in yeast YCK1/YCK2 mutants, restoring growth and morphology.","method":"Molecular cloning, recombinant protein expression in E. coli, in vitro kinase assay, Northern hybridization, yeast complementation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted enzymatic activity in vitro with multiple substrates, complementation in yeast, broad tissue expression profiling","pmids":["7759525"],"is_preprint":false},{"year":2001,"finding":"All wild-type CK1 isoforms, including the gamma subfamily members (CK1γ1, γ2, γ3), were shown to activate Wnt/β-catenin signaling in sufficiency tests. Unlike other CK1 isoforms, the gamma isoforms did not increase phosphorylation of Dishevelled (Dsh) in vivo and did not directly phosphorylate Dsh in vitro, suggesting a distinct mechanism by which CK1γ isoforms contribute to Wnt signaling.","method":"In vivo Wnt signaling reporter assay, in vitro kinase assay with Dsh substrate, cell-based phosphorylation assay","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — functional epistasis with multiple isoforms tested in parallel; CSNK1G3 role inferred as part of gamma subfamily; single lab","pmids":["11437445"],"is_preprint":false},{"year":2006,"finding":"An siRNA kinome screen identified CSNK1G3 as an Akt-cooperating kinase in cancer cells. siRNA knockdown of CSNK1G3 enhanced cell killing by the Akt inhibitor A-443654 and caused decreases in Akt Ser-473 and ribosomal protein S6 phosphorylation, placing CSNK1G3 in a signaling axis that supports Akt activity and downstream mTOR/S6 signaling.","method":"RNAi kinome screen (siRNA library), cell viability assay, immunoblot for phospho-Akt(S473) and phospho-S6","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — phenotypic screen with biochemical validation of Akt/S6 phosphorylation; single lab, single method per endpoint","pmids":["16247451"],"is_preprint":false},{"year":2018,"finding":"siRNA knockdown of CSNK1G3 was found to negatively regulate translation readthrough at premature stop codons in a dual reporter-based high-throughput screen, indicating that CSNK1G3 activity promotes readthrough and competes with translation termination.","method":"High-throughput siRNA screen using dual reporter (enzymatic and fluorescence activities), functional readthrough assay","journal":"Human molecular genetics","confidence":"Low","confidence_rationale":"Tier 3 — single screen result with no mechanistic follow-up specific to CSNK1G3; no direct biochemical validation of how CSNK1G3 modulates the ribosome","pmids":["29177465"],"is_preprint":false},{"year":2024,"finding":"CSNK1G3 was identified as the direct molecular target of the curcumin derivative N17 in triple-negative breast cancer cells. CSNK1G3 was shown to regulate phosphorylation of AKT at Ser-473 (p-AKT(S473)), and its inhibition by N17 suppressed the epithelial-mesenchymal transition (EMT) and triggered apoptosis through the CSNK1G3/AKT signaling axis.","method":"Target identification (N17 compound binding to CSNK1G3), immunoblot for p-AKT(S473), cell proliferation and apoptosis assays, EMT marker analysis","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — direct target engagement with mechanistic downstream validation of AKT phosphorylation and EMT/apoptosis phenotype; single lab","pmids":["39127154"],"is_preprint":false},{"year":2025,"finding":"In a mouse epilepsy model and HT22 hippocampal neuronal cells, circRNA-Csnk1g3 was shown to promote transcription of the canonical Csnk1g3 mRNA (and a truncated isoform Csnk1g3-85aa) by directly targeting its 3'-UTR. Elevated Csnk1g3/CK1γ3 protein was associated with increased TNF-α signaling, RIP1/RIP3/MLKL-mediated necroptosis, and neuroinflammation (IL-6, IL-1β). The traditional medicine JWCHSGD reduced epileptic events by downregulating this circRNA-Csnk1g3/Csnk1g3-85aa/CK1γ3/TNF-α axis.","method":"In vivo epilepsy mouse model, HT22 cell culture, EEG, TUNEL assay, qRT-PCR, western blot, CCK-8 viability, flow cytometry apoptosis assay","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 — mechanistic pathway placement of CK1γ3 in necroptosis/TNF-α signaling is indirect; circRNA regulation of the canonical protein confirmed, but CK1γ3 kinase substrate not identified; single lab","pmids":["39920301"],"is_preprint":false},{"year":2026,"finding":"In hippocampal HT22 cells treated with a magnesium-free epilepsy model, circRNA-Csnk1g3 was shown by dual-luciferase reporter assay and RNA immunoprecipitation (RIP) to directly target the 3'-UTR of Csnk1g3 mRNA and promote its transcription. Elevated Csnk1g3 drove pyroptosis via the Wnt/β-catenin pathway (upregulating Wnt3a, β-catenin, LRP6, Caspase-1, GSDMD, NLRP3, IL-1β). Knockdown of circRNA-Csnk1g3 reduced Csnk1g3 expression and pyroptotic markers.","method":"Dual-luciferase reporter assay, RNA immunoprecipitation (RIP), FISH for subcellular localization, qRT-PCR, western blot, immunofluorescence, electron microscopy, Dil staining, LC-MS/MS chemical characterization","journal":"Journal of ethnopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — dual-luciferase and RIP provide direct evidence of circRNA targeting canonical Csnk1g3 3'-UTR; Wnt/pyroptosis pathway placement supported by multiple orthogonal methods; single lab","pmids":["41633109"],"is_preprint":false}],"current_model":"CSNK1G3 (CK1γ3) is an active serine/threonine kinase of the casein kinase 1 gamma subfamily that autophosphorylates and phosphorylates canonical CK1 substrates; it functions as a positive regulator of Wnt/β-catenin signaling (though via a Dishevelled-independent mechanism distinct from other CK1 isoforms), supports AKT(Ser-473) phosphorylation and downstream mTOR/S6 signaling in cancer cells, and participates in TNF-α-mediated necroptosis and Wnt/β-catenin-driven pyroptosis in hippocampal neurons, with its expression positively regulated at the post-transcriptional level by a cognate circRNA targeting its 3'-UTR."},"narrative":{"teleology":[{"year":1995,"claim":"Cloning and biochemical characterization established CSNK1G3 as an enzymatically active CK1 family kinase with broad tissue expression, resolving the basic identity and catalytic competence of the gamma-3 isoform.","evidence":"Recombinant protein expressed in E. coli phosphorylated canonical CK1 substrates and autophosphorylated; yeast complementation of YCK1/YCK2 deletion confirmed in vivo kinase function","pmids":["7759525"],"confidence":"High","gaps":["No endogenous substrate identified in mammalian cells","Subcellular localization not determined","Regulation of kinase activity (beyond CK1-7 inhibition) not addressed"]},{"year":2001,"claim":"Demonstration that CK1γ isoforms, including CSNK1G3, activate Wnt/β-catenin signaling without phosphorylating Dishevelled revealed a mechanistically distinct entry point for the gamma subfamily into Wnt pathway regulation.","evidence":"Wnt reporter assays showed activation by CK1γ3; in vitro kinase assays and in vivo phosphorylation studies showed no Dsh phosphorylation by gamma isoforms","pmids":["11437445"],"confidence":"Medium","gaps":["The direct substrate mediating Wnt activation by CK1γ3 was not identified","Physiological relevance not confirmed by loss-of-function in vivo","Relationship to LRP6 phosphorylation not yet tested"]},{"year":2006,"claim":"A kinome-wide RNAi screen placed CSNK1G3 upstream of AKT Ser-473 and ribosomal protein S6 phosphorylation, establishing it as a cooperating kinase in AKT-dependent survival signaling in cancer cells.","evidence":"siRNA knockdown reduced p-AKT(S473) and p-S6 levels and sensitized cancer cells to an AKT inhibitor","pmids":["16247451"],"confidence":"Medium","gaps":["Whether CSNK1G3 directly phosphorylates AKT or acts indirectly was not resolved","Only one cell line context; generalizability unknown","No reconstituted kinase-substrate assay for the AKT axis"]},{"year":2024,"claim":"Identification of CSNK1G3 as the direct target of the curcumin derivative N17 independently confirmed the CSNK1G3–AKT signaling axis and extended it to EMT regulation and apoptosis in triple-negative breast cancer.","evidence":"Target engagement of N17 with CSNK1G3 validated by binding assays; inhibition suppressed p-AKT(S473), EMT markers, and triggered apoptosis","pmids":["39127154"],"confidence":"Medium","gaps":["Direct phosphorylation of AKT by CSNK1G3 still not biochemically reconstituted","Selectivity of N17 for CSNK1G3 over other CK1 isoforms not fully characterized","In vivo tumor model validation not reported"]},{"year":2025,"claim":"Discovery that circRNA-Csnk1g3 upregulates CSNK1G3 protein via 3′-UTR targeting, and that elevated CK1γ3 drives TNF-α/RIP1/RIP3/MLKL necroptosis in hippocampal neurons, placed CSNK1G3 in neuroinflammatory cell death for the first time.","evidence":"Mouse epilepsy model and HT22 cells; qRT-PCR, western blot, TUNEL, flow cytometry for necroptosis and inflammatory markers","pmids":["39920301"],"confidence":"Low","gaps":["CK1γ3 substrates in the necroptosis pathway not identified; pathway placement is correlative","Single lab, no independent replication","Relative contribution of truncated Csnk1g3-85aa isoform versus full-length kinase unclear"]},{"year":2026,"claim":"Orthogonal validation by dual-luciferase and RIP assays confirmed the circRNA-Csnk1g3/CSNK1G3 regulatory axis and extended the downstream consequence to Wnt/β-catenin-mediated pyroptosis (NLRP3/Caspase-1/GSDMD) in epileptic neurons.","evidence":"Dual-luciferase reporter and RNA immunoprecipitation in HT22 cells; pyroptosis markers by western blot, immunofluorescence, and electron microscopy","pmids":["41633109"],"confidence":"Medium","gaps":["Whether CK1γ3 directly phosphorylates LRP6 or β-catenin pathway components in this context is unknown","Only one neuronal cell line used; in vivo pyroptosis phenotype not confirmed with CSNK1G3 genetic ablation","Relationship between necroptosis (TNF-α axis) and pyroptosis (Wnt axis) downstream of CK1γ3 not delineated"]},{"year":null,"claim":"The direct phosphorylation substrates by which CSNK1G3 activates Wnt/β-catenin signaling and supports AKT Ser-473 phosphorylation remain unidentified, and the structural basis for isoform-specific functions within the CK1γ subfamily is unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure or cryo-EM model of CSNK1G3","No unbiased phosphoproteomics identifying direct substrates","In vivo loss-of-function phenotype in knockout mice not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,4]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0]}],"localization":[],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,4,6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,5,6]}],"complexes":[],"partners":["AKT1","RIP1","RIP3","MLKL","CTNNB1"],"other_free_text":[]},"mechanistic_narrative":"CSNK1G3 (CK1γ3) is a serine/threonine kinase of the casein kinase 1 gamma subfamily that autophosphorylates and phosphorylates canonical CK1 substrates (casein, phosvitin), and functionally complements yeast CK1 orthologs YCK1/YCK2 [PMID:7759525]. CSNK1G3 activates Wnt/β-catenin signaling through a Dishevelled-independent mechanism distinct from other CK1 isoforms [PMID:11437445] and supports AKT Ser-473 phosphorylation and downstream mTOR/S6 signaling, linking it to epithelial–mesenchymal transition and survival in cancer cells [PMID:16247451, PMID:39127154]. Its expression is positively regulated at the post-transcriptional level by circRNA-Csnk1g3 targeting the 3′-UTR of CSNK1G3 mRNA, and elevated CSNK1G3 promotes Wnt/β-catenin-driven pyroptosis and RIP1/RIP3/MLKL-mediated necroptosis in hippocampal neurons [PMID:41633109, PMID:39920301]."},"prefetch_data":{"uniprot":{"accession":"Q9Y6M4","full_name":"Casein kinase I isoform gamma-3","aliases":[],"length_aa":447,"mass_kda":51.4,"function":"Serine/threonine-protein kinase. Casein kinases are operationally defined by their preferential utilization of acidic proteins such as caseins as substrates. It can phosphorylate a large number of proteins. Participates in Wnt signaling. Regulates fast synaptic transmission mediated by glutamate (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9Y6M4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CSNK1G3","classification":"Not 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CSNK1G3","url":"https://www.omim.org/entry/604253"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CSNK1G3"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6M4","domains":[{"cath_id":"3.30.200.20","chopping":"37-116","consensus_level":"high","plddt":93.4521,"start":37,"end":116},{"cath_id":"1.10.510.10","chopping":"120-314","consensus_level":"high","plddt":96.9565,"start":120,"end":314}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6M4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6M4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6M4-F1-predicted_aligned_error_v6.png","plddt_mean":76.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CSNK1G3","jax_strain_url":"https://www.jax.org/strain/search?query=CSNK1G3"},"sequence":{"accession":"Q9Y6M4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6M4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6M4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6M4"}},"corpus_meta":[{"pmid":"27485317","id":"PMC_27485317","title":"Estimation 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B","url":"https://pubmed.ncbi.nlm.nih.gov/35256949","citation_count":66,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18082144","id":"PMC_18082144","title":"Arabidopsis HY5 protein functions as a DNA-binding tag for purification and functional immobilization of proteins on agarose/DNA microplate.","date":"2007","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/18082144","citation_count":65,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32513696","id":"PMC_32513696","title":"RIG-I regulates myeloid differentiation by promoting TRIM25-mediated ISGylation.","date":"2020","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/32513696","citation_count":47,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8311,"output_tokens":1332,"usd":0.022457},"stage2":{"model":"claude-opus-4-6","input_tokens":4572,"output_tokens":1641,"usd":0.095827},"total_usd":0.303265,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":20996,"output_tokens":3624,"usd":0.058674},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5921,"output_tokens":2184,"usd":0.126307}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"RNAi knockdown of CSNK1G3 significantly enhanced cancer cell killing in the presence of Akt inhibitor A-443654, and caused decreases in Akt Ser-473 and ribosomal protein S6 phosphorylation, identifying CSNK1G3 as an Akt-cooperating kinase that supports PI3K/Akt signaling.\",\n      \"method\": \"siRNA screen (kinome-wide RNAi library) with cell viability readout and phospho-Akt/S6 western blot\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean siRNA knockdown with defined phospho-protein readout; single lab, single study\",\n      \"pmids\": [\"16247451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"siRNA knockdown of CSNK1G3 negatively regulated aminoglycoside-mediated translation readthrough, placing CSNK1G3 as a positive modulator of nonsense suppression competing with translation termination.\",\n      \"method\": \"siRNA knockdown using dual reporter (enzymatic/fluorescence) high-throughput screen for translation readthrough\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single siRNA screen result, no direct biochemical follow-up on mechanism\",\n      \"pmids\": [\"29177465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CSNK1G3 protein was identified as the direct target of curcumin derivative N17; N17-mediated inhibition of CSNK1G3 suppressed AKT Ser-473 phosphorylation, thereby inhibiting epithelial-mesenchymal transition and inducing apoptosis in triple-negative breast cancer cells via the CSNK1G3/AKT signaling axis.\",\n      \"method\": \"Target identification by drug-protein binding assay, western blot for p-AKT(S473), cell viability/apoptosis assays, EMT marker analysis\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct target engagement shown with functional phospho-AKT readout; single lab\",\n      \"pmids\": [\"39127154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In mouse hippocampal neuronal HT22 cells and in vivo epilepsy models, circRNA-Csnk1g3 was shown by dual-luciferase and RNA immunoprecipitation assays to directly target the 3'-UTR of Csnk1g3 mRNA, promoting its transcription; elevated Csnk1g3 (CK1γ3) was linked to activation of the TNF-α/necroptosis (RIP1/RIP3/MLKL) pathway and inflammation.\",\n      \"method\": \"Dual-luciferase reporter assay, RNA immunoprecipitation (RIP), FISH localization, qRT-PCR, western blot, in vivo epilepsy model with EEG/histopathology\",\n      \"journal\": \"Journal of ethnopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dual-luciferase and RIP validate circRNA-Csnk1g3 → Csnk1g3 regulatory interaction with functional pathway readout; single lab\",\n      \"pmids\": [\"41633109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A novel CSNK1G3-ALK fusion gene was identified in a lung squamous cell carcinoma patient; the fusion drove ALK-dependent tumor growth that was sensitive to ALK tyrosine kinase inhibitors (alectinib, crizotinib, lorlatinib) in a patient-derived xenograft model.\",\n      \"method\": \"DNA-based NGS fusion detection, patient-derived xenograft (PDX) in vivo tumor inhibition assay with ALK-TKIs\",\n      \"journal\": \"Clinical lung cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single case/PDX, identifies CSNK1G3 as fusion partner but mechanism of CSNK1G3 contribution not characterized\",\n      \"pmids\": [\"40783309\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CSNK1G3 (Casein Kinase 1 Gamma 3) functions as a kinase that positively supports AKT Ser-473 phosphorylation and downstream S6 signaling; its expression is promoted by circRNA-Csnk1g3 via direct 3'-UTR targeting, and its activity has been linked to regulation of translation readthrough, necroptosis/inflammation via the TNF-α/RIP1/RIP3/MLKL axis, and Wnt/β-catenin-mediated pyroptosis in neuronal contexts.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n\n**Retrieved Papers:**\n1. PMID:27485317 - GWAS/genetic parameters study, mentions CSNK1G3 only as a SNP association → EXCLUDE (no mechanistic finding)\n2. PMID:16247451 - RNAi screen identifies CSNK1G3 as Akt-cooperating kinase → KEEP\n3. PMID:29177465 - siRNA screen identifies CSNK1G3 as regulator of translation readthrough → KEEP\n4. PMID:33170928 - Population genetics/selection study, CSNK1G3 mentioned as candidate locus → EXCLUDE\n5. PMID:33084421 - Vitiligo gene expression study, CSNK1G3 mentioned in expression panel → EXCLUDE\n6. PMID:28361102 - SNP association study → EXCLUDE\n7. PMID:40706934 - Horse testis transcriptomics, CSNK1G3 mentioned as circRNA → EXCLUDE (alt-locus product / expression)\n8. PMID:39127154 - N17 compound targets CSNK1G3/AKT axis in TNBC → KEEP\n9. PMID:40842671 - MR/expression study, CSNK1G3 downregulated in CaOx stones → EXCLUDE\n10. PMID:39920301 - circRNA-Csnk1g3/Csnk1g3-85aa pathway in epilepsy → KEEP (describes canonical protein CK1γ3 in a signaling pathway)\n11. PMID:40783309 - CSNK1G3-ALK fusion in lung cancer → EXCLUDE (fusion protein, not canonical CSNK1G3 function)\n12. PMID:41633109 - circRNA-Csnk1g3/Wnt/β-catenin → KEEP (describes canonical Csnk1g3 protein role)\n\n**Gene2pubmed Papers:**\n- PMID:24097068 - Lipid GWAS, no CSNK1G3 mechanism → EXCLUDE\n- PMID:12477932 - MGC cDNA sequencing project → EXCLUDE (no mechanistic finding)\n- PMID:20562859 - Autophagy interactome, CSNK1G3 may appear as interactor → EXCLUDE (no specific mechanistic finding for CSNK1G3)\n- PMID:26186194 - BioPlex interactome → EXCLUDE (large-scale screen, no specific mechanism)\n- PMID:28514442 - BioPlex 2.0 → EXCLUDE\n- PMID:26496610 - Quantitative interactome → EXCLUDE\n- PMID:32296183 - HuRI interactome → EXCLUDE\n- PMID:33961781 - BioPlex 3.0 → EXCLUDE\n- PMID:21873635 - GO annotation → EXCLUDE\n- PMID:15489334 - MGC project → EXCLUDE\n- PMID:35271311 - OpenCell → EXCLUDE\n- PMID:16344560 - Alternative promoters → EXCLUDE\n- PMID:34079125 - BioID map → EXCLUDE\n- PMID:15146197 - hES cell transcriptome → EXCLUDE\n- PMID:19451621 - KIFAP3/ALS study → EXCLUDE\n- PMID:19322201 - HuR ubiquitination → EXCLUDE\n- PMID:29117863 - TRIM25 RNA-binding → EXCLUDE\n- PMID:31871319 - Rho GTPase proximity network → EXCLUDE\n- PMID:11437445 - CKI family in Wnt signaling (covers gamma isoforms including CK1γ3) → KEEP\n- PMID:16186692 - CK1 family review → EXCLUDE (review, not primary mechanistic paper)\n- PMID:35013218 - EZH2/MYC study → EXCLUDE\n- PMID:7759525 - Original cloning and characterization of CK1γ subfamily including CK1γ3 → KEEP\n- PMID:32707033 - Kinase interaction network → EXCLUDE (large-scale, no specific CSNK1G3 mechanism extracted)\n- PMID:25500533 - LRRK2 phosphorylation by CK1α → EXCLUDE (CK1α, not CSNK1G3)\n- PMID:26389662 - VCP-UBXD proteomics → EXCLUDE\n- PMID:31586073 - Midbody interactome → EXCLUDE\n- PMID:30194290 - RAS interactomes → EXCLUDE\n- PMID:35256949 - Parkin acetylation → EXCLUDE\n- PMID:18082144 - Arabidopsis HY5/protein microarray → EXCLUDE (mentions kinase autophosphorylation assay but not CSNK1G3-specific)\n- PMID:32513696 - RIG-I/TRIM25 → EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"CK1γ3 (CSNK1G3) was molecularly cloned from rat testis as one of three members of the CK1 gamma subfamily. The recombinant protein expressed in E. coli was shown to be an active kinase that phosphorylates canonical CK1 substrates (casein, phosvitin, and the synthetic peptide D4), undergoes autophosphorylation in the presence of ATP and Mg2+, and is inhibited by the CK1 inhibitor CK1-7. CK1γ3 mRNA was detected in brain, heart, kidney, lung, liver, and muscle. Expression of CK1γ1 or CK1γ3 complemented defects in yeast YCK1/YCK2 mutants, restoring growth and morphology.\",\n      \"method\": \"Molecular cloning, recombinant protein expression in E. coli, in vitro kinase assay, Northern hybridization, yeast complementation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted enzymatic activity in vitro with multiple substrates, complementation in yeast, broad tissue expression profiling\",\n      \"pmids\": [\"7759525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"All wild-type CK1 isoforms, including the gamma subfamily members (CK1γ1, γ2, γ3), were shown to activate Wnt/β-catenin signaling in sufficiency tests. Unlike other CK1 isoforms, the gamma isoforms did not increase phosphorylation of Dishevelled (Dsh) in vivo and did not directly phosphorylate Dsh in vitro, suggesting a distinct mechanism by which CK1γ isoforms contribute to Wnt signaling.\",\n      \"method\": \"In vivo Wnt signaling reporter assay, in vitro kinase assay with Dsh substrate, cell-based phosphorylation assay\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional epistasis with multiple isoforms tested in parallel; CSNK1G3 role inferred as part of gamma subfamily; single lab\",\n      \"pmids\": [\"11437445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"An siRNA kinome screen identified CSNK1G3 as an Akt-cooperating kinase in cancer cells. siRNA knockdown of CSNK1G3 enhanced cell killing by the Akt inhibitor A-443654 and caused decreases in Akt Ser-473 and ribosomal protein S6 phosphorylation, placing CSNK1G3 in a signaling axis that supports Akt activity and downstream mTOR/S6 signaling.\",\n      \"method\": \"RNAi kinome screen (siRNA library), cell viability assay, immunoblot for phospho-Akt(S473) and phospho-S6\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — phenotypic screen with biochemical validation of Akt/S6 phosphorylation; single lab, single method per endpoint\",\n      \"pmids\": [\"16247451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"siRNA knockdown of CSNK1G3 was found to negatively regulate translation readthrough at premature stop codons in a dual reporter-based high-throughput screen, indicating that CSNK1G3 activity promotes readthrough and competes with translation termination.\",\n      \"method\": \"High-throughput siRNA screen using dual reporter (enzymatic and fluorescence activities), functional readthrough assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single screen result with no mechanistic follow-up specific to CSNK1G3; no direct biochemical validation of how CSNK1G3 modulates the ribosome\",\n      \"pmids\": [\"29177465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CSNK1G3 was identified as the direct molecular target of the curcumin derivative N17 in triple-negative breast cancer cells. CSNK1G3 was shown to regulate phosphorylation of AKT at Ser-473 (p-AKT(S473)), and its inhibition by N17 suppressed the epithelial-mesenchymal transition (EMT) and triggered apoptosis through the CSNK1G3/AKT signaling axis.\",\n      \"method\": \"Target identification (N17 compound binding to CSNK1G3), immunoblot for p-AKT(S473), cell proliferation and apoptosis assays, EMT marker analysis\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct target engagement with mechanistic downstream validation of AKT phosphorylation and EMT/apoptosis phenotype; single lab\",\n      \"pmids\": [\"39127154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In a mouse epilepsy model and HT22 hippocampal neuronal cells, circRNA-Csnk1g3 was shown to promote transcription of the canonical Csnk1g3 mRNA (and a truncated isoform Csnk1g3-85aa) by directly targeting its 3'-UTR. Elevated Csnk1g3/CK1γ3 protein was associated with increased TNF-α signaling, RIP1/RIP3/MLKL-mediated necroptosis, and neuroinflammation (IL-6, IL-1β). The traditional medicine JWCHSGD reduced epileptic events by downregulating this circRNA-Csnk1g3/Csnk1g3-85aa/CK1γ3/TNF-α axis.\",\n      \"method\": \"In vivo epilepsy mouse model, HT22 cell culture, EEG, TUNEL assay, qRT-PCR, western blot, CCK-8 viability, flow cytometry apoptosis assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic pathway placement of CK1γ3 in necroptosis/TNF-α signaling is indirect; circRNA regulation of the canonical protein confirmed, but CK1γ3 kinase substrate not identified; single lab\",\n      \"pmids\": [\"39920301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In hippocampal HT22 cells treated with a magnesium-free epilepsy model, circRNA-Csnk1g3 was shown by dual-luciferase reporter assay and RNA immunoprecipitation (RIP) to directly target the 3'-UTR of Csnk1g3 mRNA and promote its transcription. Elevated Csnk1g3 drove pyroptosis via the Wnt/β-catenin pathway (upregulating Wnt3a, β-catenin, LRP6, Caspase-1, GSDMD, NLRP3, IL-1β). Knockdown of circRNA-Csnk1g3 reduced Csnk1g3 expression and pyroptotic markers.\",\n      \"method\": \"Dual-luciferase reporter assay, RNA immunoprecipitation (RIP), FISH for subcellular localization, qRT-PCR, western blot, immunofluorescence, electron microscopy, Dil staining, LC-MS/MS chemical characterization\",\n      \"journal\": \"Journal of ethnopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dual-luciferase and RIP provide direct evidence of circRNA targeting canonical Csnk1g3 3'-UTR; Wnt/pyroptosis pathway placement supported by multiple orthogonal methods; single lab\",\n      \"pmids\": [\"41633109\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CSNK1G3 (CK1γ3) is an active serine/threonine kinase of the casein kinase 1 gamma subfamily that autophosphorylates and phosphorylates canonical CK1 substrates; it functions as a positive regulator of Wnt/β-catenin signaling (though via a Dishevelled-independent mechanism distinct from other CK1 isoforms), supports AKT(Ser-473) phosphorylation and downstream mTOR/S6 signaling in cancer cells, and participates in TNF-α-mediated necroptosis and Wnt/β-catenin-driven pyroptosis in hippocampal neurons, with its expression positively regulated at the post-transcriptional level by a cognate circRNA targeting its 3'-UTR.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CSNK1G3 (Casein Kinase 1 Gamma 3) is a serine/threonine kinase that positively supports AKT Ser-473 phosphorylation and downstream PI3K/AKT signaling; RNAi knockdown reduces phospho-AKT(S473) and phospho-S6 levels, sensitizing cancer cells to AKT inhibition, and pharmacological inhibition of CSNK1G3 recapitulates these effects in triple-negative breast cancer by suppressing epithelial-mesenchymal transition and inducing apoptosis [PMID:16247451, PMID:39127154]. CSNK1G3 expression is regulated by circRNA-Csnk1g3, which directly targets the Csnk1g3 3′-UTR to promote its expression; elevated CSNK1G3 activates the TNF-α/RIP1/RIP3/MLKL necroptosis pathway and neuroinflammation in hippocampal neurons and in vivo epilepsy models [PMID:41633109].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"A kinome-wide RNAi screen revealed that CSNK1G3 cooperates with AKT signaling, establishing it as a kinase that supports AKT Ser-473 and S6 phosphorylation and whose depletion sensitizes cancer cells to AKT inhibitors.\",\n      \"evidence\": \"siRNA knockdown with phospho-AKT/S6 western blot and cell viability assays in cancer cell lines\",\n      \"pmids\": [\"16247451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CSNK1G3 directly phosphorylates AKT or acts through an intermediate kinase is unknown\",\n        \"No biochemical kinase assay with purified components was performed\",\n        \"Generalizability beyond the specific cancer cell lines used is untested\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CSNK1G3 was identified as a positive modulator of aminoglycoside-mediated translation readthrough, suggesting a role in regulating nonsense suppression at the ribosome.\",\n      \"evidence\": \"siRNA knockdown in a dual-reporter high-throughput readthrough screen\",\n      \"pmids\": [\"29177465\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No biochemical follow-up on mechanism; result is from a single screening hit without validation\",\n        \"Substrate or phosphorylation target relevant to readthrough is unidentified\",\n        \"Not independently replicated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Independent pharmacological evidence confirmed that CSNK1G3 sustains AKT Ser-473 phosphorylation: a curcumin derivative (N17) directly binds CSNK1G3, and its inhibition suppresses p-AKT(S473), blocks EMT, and induces apoptosis in triple-negative breast cancer cells.\",\n      \"evidence\": \"Drug-protein binding assay, phospho-AKT western blot, EMT marker analysis, and apoptosis assays in TNBC cells\",\n      \"pmids\": [\"39127154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether N17 is fully selective for CSNK1G3 versus other CK1 family members is not resolved\",\n        \"Direct kinase-substrate relationship between CSNK1G3 and AKT remains uncharacterized\",\n        \"In vivo anti-tumor efficacy via CSNK1G3 inhibition not yet demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"circRNA-Csnk1g3 was shown to directly target the 3′-UTR of Csnk1g3 mRNA to upregulate its expression, linking CSNK1G3 to TNF-α/RIP1/RIP3/MLKL-mediated necroptosis and neuroinflammation in epilepsy models.\",\n      \"evidence\": \"Dual-luciferase reporter assay, RNA immunoprecipitation, FISH, qRT-PCR, western blot, and in vivo epilepsy model with EEG/histopathology in mouse hippocampal HT22 cells\",\n      \"pmids\": [\"41633109\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CSNK1G3 directly phosphorylates RIP1, RIP3, or MLKL or acts indirectly is unknown\",\n        \"The mechanism by which circRNA targets the 3′-UTR (miRNA sponge vs. direct binding) needs further dissection\",\n        \"Findings are from a single lab using one neuronal cell line and one epilepsy model\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct phosphorylation substrates of CSNK1G3 that mediate its effects on AKT signaling and necroptosis remain unidentified, and no structural model of CSNK1G3 in complex with substrates or inhibitors exists.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No in vitro kinase assay with purified CSNK1G3 and candidate substrates has been reported\",\n        \"No crystal or cryo-EM structure of CSNK1G3 is available\",\n        \"The physiological contexts in which CSNK1G3 is rate-limiting versus redundant with other CK1 family members are uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0140096\",\n        \"supporting_discovery_ids\": [0, 2]\n      }\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\n        \"term_id\": \"R-HSA-162582\",\n        \"supporting_discovery_ids\": [0, 2]\n      },\n      {\n        \"term_id\": \"R-HSA-5357801\",\n        \"supporting_discovery_ids\": [2, 3]\n      }\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"AKT1\",\n      \"RIP1\",\n      \"RIP3\",\n      \"MLKL\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"CSNK1G3 (CK1γ3) is a serine/threonine kinase of the casein kinase 1 gamma subfamily that autophosphorylates and phosphorylates canonical CK1 substrates (casein, phosvitin), and functionally complements yeast CK1 orthologs YCK1/YCK2 [PMID:7759525]. CSNK1G3 activates Wnt/β-catenin signaling through a Dishevelled-independent mechanism distinct from other CK1 isoforms [PMID:11437445] and supports AKT Ser-473 phosphorylation and downstream mTOR/S6 signaling, linking it to epithelial–mesenchymal transition and survival in cancer cells [PMID:16247451, PMID:39127154]. Its expression is positively regulated at the post-transcriptional level by circRNA-Csnk1g3 targeting the 3′-UTR of CSNK1G3 mRNA, and elevated CSNK1G3 promotes Wnt/β-catenin-driven pyroptosis and RIP1/RIP3/MLKL-mediated necroptosis in hippocampal neurons [PMID:41633109, PMID:39920301].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Cloning and biochemical characterization established CSNK1G3 as an enzymatically active CK1 family kinase with broad tissue expression, resolving the basic identity and catalytic competence of the gamma-3 isoform.\",\n      \"evidence\": \"Recombinant protein expressed in E. coli phosphorylated canonical CK1 substrates and autophosphorylated; yeast complementation of YCK1/YCK2 deletion confirmed in vivo kinase function\",\n      \"pmids\": [\"7759525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No endogenous substrate identified in mammalian cells\",\n        \"Subcellular localization not determined\",\n        \"Regulation of kinase activity (beyond CK1-7 inhibition) not addressed\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstration that CK1γ isoforms, including CSNK1G3, activate Wnt/β-catenin signaling without phosphorylating Dishevelled revealed a mechanistically distinct entry point for the gamma subfamily into Wnt pathway regulation.\",\n      \"evidence\": \"Wnt reporter assays showed activation by CK1γ3; in vitro kinase assays and in vivo phosphorylation studies showed no Dsh phosphorylation by gamma isoforms\",\n      \"pmids\": [\"11437445\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The direct substrate mediating Wnt activation by CK1γ3 was not identified\",\n        \"Physiological relevance not confirmed by loss-of-function in vivo\",\n        \"Relationship to LRP6 phosphorylation not yet tested\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"A kinome-wide RNAi screen placed CSNK1G3 upstream of AKT Ser-473 and ribosomal protein S6 phosphorylation, establishing it as a cooperating kinase in AKT-dependent survival signaling in cancer cells.\",\n      \"evidence\": \"siRNA knockdown reduced p-AKT(S473) and p-S6 levels and sensitized cancer cells to an AKT inhibitor\",\n      \"pmids\": [\"16247451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CSNK1G3 directly phosphorylates AKT or acts indirectly was not resolved\",\n        \"Only one cell line context; generalizability unknown\",\n        \"No reconstituted kinase-substrate assay for the AKT axis\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of CSNK1G3 as the direct target of the curcumin derivative N17 independently confirmed the CSNK1G3–AKT signaling axis and extended it to EMT regulation and apoptosis in triple-negative breast cancer.\",\n      \"evidence\": \"Target engagement of N17 with CSNK1G3 validated by binding assays; inhibition suppressed p-AKT(S473), EMT markers, and triggered apoptosis\",\n      \"pmids\": [\"39127154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct phosphorylation of AKT by CSNK1G3 still not biochemically reconstituted\",\n        \"Selectivity of N17 for CSNK1G3 over other CK1 isoforms not fully characterized\",\n        \"In vivo tumor model validation not reported\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that circRNA-Csnk1g3 upregulates CSNK1G3 protein via 3′-UTR targeting, and that elevated CK1γ3 drives TNF-α/RIP1/RIP3/MLKL necroptosis in hippocampal neurons, placed CSNK1G3 in neuroinflammatory cell death for the first time.\",\n      \"evidence\": \"Mouse epilepsy model and HT22 cells; qRT-PCR, western blot, TUNEL, flow cytometry for necroptosis and inflammatory markers\",\n      \"pmids\": [\"39920301\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"CK1γ3 substrates in the necroptosis pathway not identified; pathway placement is correlative\",\n        \"Single lab, no independent replication\",\n        \"Relative contribution of truncated Csnk1g3-85aa isoform versus full-length kinase unclear\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Orthogonal validation by dual-luciferase and RIP assays confirmed the circRNA-Csnk1g3/CSNK1G3 regulatory axis and extended the downstream consequence to Wnt/β-catenin-mediated pyroptosis (NLRP3/Caspase-1/GSDMD) in epileptic neurons.\",\n      \"evidence\": \"Dual-luciferase reporter and RNA immunoprecipitation in HT22 cells; pyroptosis markers by western blot, immunofluorescence, and electron microscopy\",\n      \"pmids\": [\"41633109\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CK1γ3 directly phosphorylates LRP6 or β-catenin pathway components in this context is unknown\",\n        \"Only one neuronal cell line used; in vivo pyroptosis phenotype not confirmed with CSNK1G3 genetic ablation\",\n        \"Relationship between necroptosis (TNF-α axis) and pyroptosis (Wnt axis) downstream of CK1γ3 not delineated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct phosphorylation substrates by which CSNK1G3 activates Wnt/β-catenin signaling and supports AKT Ser-473 phosphorylation remain unidentified, and the structural basis for isoform-specific functions within the CK1γ subfamily is unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal structure or cryo-EM model of CSNK1G3\",\n        \"No unbiased phosphoproteomics identifying direct substrates\",\n        \"In vivo loss-of-function phenotype in knockout mice not reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 4]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 4, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 5, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"AKT1\", \"RIP1\", \"RIP3\", \"MLKL\", \"CTNNB1\"],\n    \"other_free_text\": []\n  }\n}\n```"}