{"gene":"ZC3H12C","run_date":"2026-04-28T23:00:24","timeline":{"discoveries":[{"year":2021,"finding":"MCPIP3/ZC3H12C (Regnase-3) directly degrades mRNAs of IL-6, Regnase-1, and IκBζ via its RNase activity, and in turn Regnase-1 degrades MCPIP3 mRNA, establishing a mutual post-transcriptional regulatory loop.","method":"mRNA degradation assays, loss-of-function (MCPIP3-deficient macrophages/pDCs), in vivo imiquimod model","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KO cells, in vivo model), replicated in separate paper (PMID:34298932)","pmids":["34215755","34298932"],"is_preprint":false},{"year":2021,"finding":"ZC3H12C/Regnase-3 directly degrades TNF mRNA via its RNase (NYN/PIN domain) activity, as demonstrated by in vitro RNase assays; this activity is distinct from other family members in substrate specificity.","method":"In vitro RNase assay, reporter assays, comparison with Regnase-1/2/4 substrates","journal":"International Journal of Molecular Sciences","confidence":"High","confidence_rationale":"Tier 1 — in vitro RNase activity demonstrated, substrate specificity mapped, confirmed by independent lab (PMID:35048402)","pmids":["34298932","35048402"],"is_preprint":false},{"year":2021,"finding":"ZC3H12C/Regnase-3 shares IL-6, IER-3, and Regnase-1 mRNAs as substrates with Regnase-1, but uniquely degrades TNF mRNA, and does not degrade IL-1β mRNA — demonstrating distinct substrate specificity within the MCPIP family.","method":"Reporter assays, mRNA stability assays, in vitro nuclease activity comparisons","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro assays from single lab, multiple substrates tested","pmids":["34298932"],"is_preprint":false},{"year":2021,"finding":"ZC3H12C/Regnase-3 differs from other MCPIP family members in NYN/PIN domain features and cellular localization pattern.","method":"Domain analysis, cellular localization imaging","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 3 — localization by imaging, single lab","pmids":["34298932"],"is_preprint":false},{"year":2022,"finding":"ZC3H12C regulates TNF mRNA stability via its RNase activity in vitro, and DC-restricted ZC3H12C depletion is sufficient to cause lymphadenopathy in vivo, confirming a functional role in TNF post-transcriptional control in dendritic cells.","method":"In vitro mRNA stability assay; DC-conditional KO mice (GFP knock-in); lymphadenopathy phenotyping; genetic rescue via Tnf deletion","journal":"Immunology and Cell Biology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro RNase assay combined with conditional KO and genetic epistasis (Tnf deletion rescue)","pmids":["35048402"],"is_preprint":false},{"year":2020,"finding":"Zc3h12c inhibits NF-κB activation in macrophages; double knockout of Gfi1 and Zc3h12c shows additive effects on pro-inflammatory cytokine production, and loss of Gfi1 upregulates Zc3h12c which in turn suppresses NF-κB — placing Zc3h12c in a negative feedback loop downstream of Gfi1.","method":"Genetic double KO, transcriptomic profiling, IKK/NF-κB pathway inactivation epistasis","journal":"Molecular Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis by double KO and pathway inactivation, single lab","pmids":["33157351"],"is_preprint":false},{"year":2024,"finding":"Zc3h12c suppresses TNF-α and IL-6 production in LPS-stimulated macrophages by inhibiting JNK, ERK, p38, and NF-κB signaling, and suppresses TNF-α promoter activity as shown by luciferase reporter assay.","method":"Overexpression/depletion in macrophages, luciferase reporter assay for TNF-α promoter, western blot for MAPK/NF-κB signaling","journal":"Cellular Immunology","confidence":"Medium","confidence_rationale":"Tier 2–3 — luciferase reporter and signaling pathway readouts, single lab","pmids":["38810592"],"is_preprint":false},{"year":2025,"finding":"Macrophage Zc3h12c modulates alternative splicing of pre-mRNA STAT1, suppresses pro-inflammatory cytokine/chemokine expression, and regulates macrophage survival, migration, and phagocytosis; conditional macrophage KO (Tnfrsf11aCre) leads to exacerbated kidney injury and inflammation.","method":"Conditional KO (Tnfrsf11aCre-Zc3h12cflox/flox mice), single-cell RNA sequencing, in silico splicing analysis, in vitro mechanistic studies","journal":"Advanced Science","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with defined phenotype, scRNA-seq and in vitro mechanistic validation; single lab","pmids":["40834429"],"is_preprint":false},{"year":2025,"finding":"MCPIP3/ZC3H12C directly cleaves cyclin B1 mRNA within its 3′ UTR via nucleolytic activity, negatively regulating cyclin B1 levels to modulate keratinocyte proliferation and epidermal differentiation.","method":"Reporter assays for direct nucleolytic cleavage, keratinocyte-specific KO mice, siRNA knockdown with proliferation marker analysis","journal":"Cell Communication and Signaling","confidence":"High","confidence_rationale":"Tier 1 — direct nucleolytic cleavage demonstrated by reporter assay, validated in KO mouse model and siRNA knockdown","pmids":["40200325"],"is_preprint":false},{"year":2025,"finding":"MCPIP3/ZC3H12C forms protein complexes with 14-3-3 proteins, keratin 14, and modulators of cell polarity in keratinocytes, and its expression peaks in peri-mitotic cells; silencing MCPIP3 and keratin 14 together synergistically increases S/G2 and G2/M phase markers (cyclin A2, cyclin B1, histone H3 Ser10 phosphorylation).","method":"Immunoprecipitation-proteomics (IP-MS), siRNA double knockdown, double thymidine block/release synchronization, western blot","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2 — IP-MS for complex identification, cell cycle synchronization for temporal expression, single lab","pmids":["41006702"],"is_preprint":false},{"year":2018,"finding":"MCPIP3/ZC3H12C overexpression inhibits cell migration and invasion in colorectal cancer cell lines (SW620, HCT116), reduces vimentin expression, and increases E-cadherin expression, indicating a role in suppressing EMT.","method":"Tet-on inducible overexpression, wound-healing assay, Transwell invasion assay, western blot for EMT markers","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 3 — overexpression with defined cellular phenotype, single lab, no upstream mechanism identified","pmids":["29751537"],"is_preprint":false}],"current_model":"ZC3H12C/MCPIP3/Regnase-3 is an RNase (NYN/PIN domain) that post-transcriptionally regulates inflammation and cell proliferation by directly degrading target mRNAs including TNF, IL-6, Regnase-1, IκBζ, and cyclin B1 (via 3′ UTR cleavage), inhibits NF-κB and MAPK signaling in macrophages, modulates alternative splicing of STAT1, forms complexes with 14-3-3 proteins and keratin 14 to regulate keratinocyte cell cycle progression, and is reciprocally regulated by Regnase-1 which degrades MCPIP3 mRNA."},"narrative":{"teleology":[{"year":2018,"claim":"The first functional characterization showed that ZC3H12C overexpression suppresses epithelial-mesenchymal transition markers and inhibits migration/invasion in colorectal cancer cells, establishing a potential anti-tumorigenic role independent of its later-defined RNase mechanism.","evidence":"Tet-on inducible overexpression in SW620/HCT116 cells with wound-healing and Transwell assays","pmids":["29751537"],"confidence":"Medium","gaps":["Upstream mechanism and direct molecular targets not identified","No loss-of-function validation","Not tested in non-cancer cell contexts"]},{"year":2020,"claim":"Epistasis experiments placed ZC3H12C as a negative regulator of NF-κB signaling in macrophages, downstream of the transcription factor Gfi1, revealing its role in an anti-inflammatory feedback circuit.","evidence":"Double KO of Gfi1 and Zc3h12c in macrophages with transcriptomic profiling and NF-κB pathway inactivation","pmids":["33157351"],"confidence":"Medium","gaps":["Whether NF-κB suppression is direct (RNase-dependent) or indirect was not resolved","Single lab study","Mechanism of Gfi1-mediated Zc3h12c upregulation not defined"]},{"year":2021,"claim":"The core enzymatic identity of ZC3H12C was established: its NYN/PIN domain directly degrades IL-6, TNF, Regnase-1, and IκBζ mRNAs, with substrate specificity distinct from other family members (e.g., unique TNF targeting, no IL-1β degradation), and a reciprocal Regnase-1–MCPIP3 mRNA degradation loop was discovered.","evidence":"In vitro RNase assays, reporter and mRNA stability assays, MCPIP3-deficient macrophages/pDCs, imiquimod in vivo model","pmids":["34215755","34298932","35048402"],"confidence":"High","gaps":["Structural basis of substrate selectivity not determined","Stem-loop or cis-element requirements in target mRNAs not mapped","Relative contributions of RNase activity versus signaling suppression to anti-inflammatory phenotypes unclear"]},{"year":2022,"claim":"In vivo genetic evidence confirmed that dendritic cell-intrinsic ZC3H12C restrains TNF-driven lymphadenopathy, linking its RNase activity to a physiological immune phenotype rescuable by Tnf deletion.","evidence":"DC-conditional KO mice (GFP knock-in), lymphadenopathy phenotyping, genetic epistasis via Tnf deletion rescue","pmids":["35048402"],"confidence":"High","gaps":["Whether ZC3H12C acts on TNF mRNA cotranscriptionally or post-export not resolved","Redundancy with Regnase-1 in DCs not systematically tested","Upstream signals activating ZC3H12C in DCs undefined"]},{"year":2024,"claim":"ZC3H12C was shown to suppress not only NF-κB but also JNK, ERK, and p38 MAPK pathways and TNF-α promoter activity in LPS-stimulated macrophages, broadening its anti-inflammatory mechanism beyond mRNA decay to signaling pathway inhibition.","evidence":"Overexpression/depletion in macrophages, luciferase reporter for TNF-α promoter, western blot for MAPK/NF-κB signaling","pmids":["38810592"],"confidence":"Medium","gaps":["Whether MAPK suppression is a direct effect or secondary to mRNA degradation of upstream regulators not distinguished","Single lab with overexpression/depletion approach","No identification of direct protein-level interactions with MAPK components"]},{"year":2025,"claim":"The functional scope of ZC3H12C was extended to two new contexts: in macrophages, it modulates STAT1 alternative splicing and regulates survival/migration/phagocytosis relevant to kidney injury; in keratinocytes, it directly cleaves cyclin B1 mRNA 3′ UTR and forms complexes with 14-3-3 and keratin 14 to control G2/M cell cycle progression and epidermal differentiation.","evidence":"Macrophage conditional KO (Tnfrsf11aCre) with scRNA-seq and in silico splicing analysis; keratinocyte-specific KO mice with reporter assays for nucleolytic cleavage; IP-MS and double thymidine block/release synchronization","pmids":["40834429","40200325","41006702"],"confidence":"Medium","gaps":["Mechanism by which ZC3H12C, an RNase, modulates alternative splicing is unclear — direct versus indirect effects not resolved","Functional significance of individual 14-3-3 and keratin 14 interactions for RNase activity not tested","Whether cyclin B1 mRNA is a universal ZC3H12C target across cell types or keratinocyte-specific is unknown"]},{"year":null,"claim":"Key unresolved questions include the structural determinants of ZC3H12C substrate selectivity, the mechanism by which it modulates pre-mRNA splicing, whether its signaling-suppressive and RNase activities are mechanistically separable, and its full target mRNA repertoire across cell types.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure available for ZC3H12C","Genome-wide target identification (e.g., CLIP-seq) not performed","Separation-of-function mutations distinguishing RNase from signaling roles not generated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,1,2,4,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6]}],"localization":[],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,4,5,6,7]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,8]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8,9]}],"complexes":[],"partners":["ZC3H12A","YWHAB","KRT14"],"other_free_text":[]},"mechanistic_narrative":"ZC3H12C (MCPIP3/Regnase-3) is an endoribonuclease of the MCPIP/Regnase family that post-transcriptionally restrains inflammation and cell proliferation by directly cleaving target mRNAs through its NYN/PIN domain. It degrades pro-inflammatory transcripts including TNF, IL-6, IκBζ, and Regnase-1 mRNAs, and is itself reciprocally regulated by Regnase-1-mediated degradation of its own mRNA, forming a mutual post-transcriptional feedback loop [PMID:34215755, PMID:34298932]. Beyond mRNA decay, ZC3H12C suppresses NF-κB and MAPK (JNK, ERK, p38) signaling in macrophages, modulates alternative splicing of STAT1 pre-mRNA, and regulates macrophage survival, migration, and phagocytosis, with conditional knockout leading to exacerbated kidney inflammation [PMID:33157351, PMID:38810592, PMID:40834429]. In keratinocytes, ZC3H12C directly cleaves cyclin B1 mRNA at its 3′ UTR to control cell cycle progression and epidermal differentiation, and forms complexes with 14-3-3 proteins and keratin 14 that cooperatively regulate G2/M transition [PMID:40200325, PMID:41006702]."},"prefetch_data":{"uniprot":{"accession":"Q9C0D7","full_name":"Probable ribonuclease ZC3H12C","aliases":["MCP-induced protein 3","Zinc finger CCCH domain-containing protein 12C"],"length_aa":883,"mass_kda":99.3,"function":"May function as RNase and regulate the levels of target RNA species","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9C0D7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZC3H12C","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZC3H12C","total_profiled":1310},"omim":[{"mim_id":"615001","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12C; ZC3H12C","url":"https://www.omim.org/entry/615001"},{"mim_id":"611106","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12D; ZC3H12D","url":"https://www.omim.org/entry/611106"},{"mim_id":"610562","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12A; ZC3H12A","url":"https://www.omim.org/entry/610562"},{"mim_id":"607467","title":"C-TYPE LECTIN-LIKE 1; CLECL1","url":"https://www.omim.org/entry/607467"},{"mim_id":"300889","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12B; ZC3H12B","url":"https://www.omim.org/entry/300889"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear membrane","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZC3H12C"},"hgnc":{"alias_symbol":["KIAA1726","MCPIP3"],"prev_symbol":[]},"alphafold":{"accession":"Q9C0D7","domains":[{"cath_id":"-","chopping":"161-190","consensus_level":"medium","plddt":86.2533,"start":161,"end":190},{"cath_id":"3.40.50.11980","chopping":"244-410","consensus_level":"high","plddt":95.1077,"start":244,"end":410},{"cath_id":"1.10.8","chopping":"839-882","consensus_level":"medium","plddt":91.248,"start":839,"end":882}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0D7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0D7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0D7-F1-predicted_aligned_error_v6.png","plddt_mean":57.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZC3H12C","jax_strain_url":"https://www.jax.org/strain/search?query=ZC3H12C"},"sequence":{"accession":"Q9C0D7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9C0D7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9C0D7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0D7"}},"corpus_meta":[{"pmid":"34215755","id":"PMC_34215755","title":"The RNase MCPIP3 promotes skin inflammation by orchestrating myeloid cytokine response.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34215755","citation_count":28,"is_preprint":false},{"pmid":"29751537","id":"PMC_29751537","title":"MCPIP3 as a Potential Metastasis Suppressor Gene in Human Colorectal Cancer.","date":"2018","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29751537","citation_count":17,"is_preprint":false},{"pmid":"38267865","id":"PMC_38267865","title":"Regulation of tumor metastasis and CD8+ T cells infiltration by circRNF216/miR-576-5p/ZC3H12C axis in colorectal cancer.","date":"2024","source":"Cellular & molecular biology letters","url":"https://pubmed.ncbi.nlm.nih.gov/38267865","citation_count":16,"is_preprint":false},{"pmid":"33157351","id":"PMC_33157351","title":"Gfi1 and Zc3h12c orchestrate a negative feedback loop that inhibits NF-kB activation during inflammation in macrophages.","date":"2020","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/33157351","citation_count":12,"is_preprint":false},{"pmid":"35048402","id":"PMC_35048402","title":"ZC3H12C expression in dendritic cells is necessary to prevent lymphadenopathy of skin-draining lymph nodes.","date":"2022","source":"Immunology and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/35048402","citation_count":8,"is_preprint":false},{"pmid":"34298932","id":"PMC_34298932","title":"Molecular Mechanisms of ZC3H12C/Reg-3 Biological Activity and Its Involvement in Psoriasis Pathology.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34298932","citation_count":6,"is_preprint":false},{"pmid":"40200325","id":"PMC_40200325","title":"MCPIP3 orchestrates the balance of epidermal proliferation and differentiation.","date":"2025","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/40200325","citation_count":2,"is_preprint":false},{"pmid":"38810592","id":"PMC_38810592","title":"Unlocking the power of Zc3h12c: Orchestrating Macrophage activation and elevating the innate immune response.","date":"2024","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/38810592","citation_count":2,"is_preprint":false},{"pmid":"40834429","id":"PMC_40834429","title":"Macrophage Zc3h12c Limits Tissue Inflammation and Injury via Alternative Splicing of Pre-mRNA.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/40834429","citation_count":1,"is_preprint":false},{"pmid":"41006702","id":"PMC_41006702","title":"MCPIP3/Regnase-3 binds 14-3-3 proteins and contributes to the regulation of the cell cycle in human immortalized keratinocytes.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/41006702","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6807,"output_tokens":2514,"usd":0.029066},"stage2":{"model":"claude-opus-4-6","input_tokens":5914,"output_tokens":2252,"usd":0.128805},"total_usd":0.157871,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"MCPIP3/ZC3H12C (Regnase-3) directly degrades mRNAs of IL-6, Regnase-1, and IκBζ via its RNase activity, and in turn Regnase-1 degrades MCPIP3 mRNA, establishing a mutual post-transcriptional regulatory loop.\",\n      \"method\": \"mRNA degradation assays, loss-of-function (MCPIP3-deficient macrophages/pDCs), in vivo imiquimod model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO cells, in vivo model), replicated in separate paper (PMID:34298932)\",\n      \"pmids\": [\"34215755\", \"34298932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZC3H12C/Regnase-3 directly degrades TNF mRNA via its RNase (NYN/PIN domain) activity, as demonstrated by in vitro RNase assays; this activity is distinct from other family members in substrate specificity.\",\n      \"method\": \"In vitro RNase assay, reporter assays, comparison with Regnase-1/2/4 substrates\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro RNase activity demonstrated, substrate specificity mapped, confirmed by independent lab (PMID:35048402)\",\n      \"pmids\": [\"34298932\", \"35048402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZC3H12C/Regnase-3 shares IL-6, IER-3, and Regnase-1 mRNAs as substrates with Regnase-1, but uniquely degrades TNF mRNA, and does not degrade IL-1β mRNA — demonstrating distinct substrate specificity within the MCPIP family.\",\n      \"method\": \"Reporter assays, mRNA stability assays, in vitro nuclease activity comparisons\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro assays from single lab, multiple substrates tested\",\n      \"pmids\": [\"34298932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZC3H12C/Regnase-3 differs from other MCPIP family members in NYN/PIN domain features and cellular localization pattern.\",\n      \"method\": \"Domain analysis, cellular localization imaging\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization by imaging, single lab\",\n      \"pmids\": [\"34298932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ZC3H12C regulates TNF mRNA stability via its RNase activity in vitro, and DC-restricted ZC3H12C depletion is sufficient to cause lymphadenopathy in vivo, confirming a functional role in TNF post-transcriptional control in dendritic cells.\",\n      \"method\": \"In vitro mRNA stability assay; DC-conditional KO mice (GFP knock-in); lymphadenopathy phenotyping; genetic rescue via Tnf deletion\",\n      \"journal\": \"Immunology and Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro RNase assay combined with conditional KO and genetic epistasis (Tnf deletion rescue)\",\n      \"pmids\": [\"35048402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Zc3h12c inhibits NF-κB activation in macrophages; double knockout of Gfi1 and Zc3h12c shows additive effects on pro-inflammatory cytokine production, and loss of Gfi1 upregulates Zc3h12c which in turn suppresses NF-κB — placing Zc3h12c in a negative feedback loop downstream of Gfi1.\",\n      \"method\": \"Genetic double KO, transcriptomic profiling, IKK/NF-κB pathway inactivation epistasis\",\n      \"journal\": \"Molecular Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis by double KO and pathway inactivation, single lab\",\n      \"pmids\": [\"33157351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Zc3h12c suppresses TNF-α and IL-6 production in LPS-stimulated macrophages by inhibiting JNK, ERK, p38, and NF-κB signaling, and suppresses TNF-α promoter activity as shown by luciferase reporter assay.\",\n      \"method\": \"Overexpression/depletion in macrophages, luciferase reporter assay for TNF-α promoter, western blot for MAPK/NF-κB signaling\",\n      \"journal\": \"Cellular Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — luciferase reporter and signaling pathway readouts, single lab\",\n      \"pmids\": [\"38810592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Macrophage Zc3h12c modulates alternative splicing of pre-mRNA STAT1, suppresses pro-inflammatory cytokine/chemokine expression, and regulates macrophage survival, migration, and phagocytosis; conditional macrophage KO (Tnfrsf11aCre) leads to exacerbated kidney injury and inflammation.\",\n      \"method\": \"Conditional KO (Tnfrsf11aCre-Zc3h12cflox/flox mice), single-cell RNA sequencing, in silico splicing analysis, in vitro mechanistic studies\",\n      \"journal\": \"Advanced Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined phenotype, scRNA-seq and in vitro mechanistic validation; single lab\",\n      \"pmids\": [\"40834429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MCPIP3/ZC3H12C directly cleaves cyclin B1 mRNA within its 3′ UTR via nucleolytic activity, negatively regulating cyclin B1 levels to modulate keratinocyte proliferation and epidermal differentiation.\",\n      \"method\": \"Reporter assays for direct nucleolytic cleavage, keratinocyte-specific KO mice, siRNA knockdown with proliferation marker analysis\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct nucleolytic cleavage demonstrated by reporter assay, validated in KO mouse model and siRNA knockdown\",\n      \"pmids\": [\"40200325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MCPIP3/ZC3H12C forms protein complexes with 14-3-3 proteins, keratin 14, and modulators of cell polarity in keratinocytes, and its expression peaks in peri-mitotic cells; silencing MCPIP3 and keratin 14 together synergistically increases S/G2 and G2/M phase markers (cyclin A2, cyclin B1, histone H3 Ser10 phosphorylation).\",\n      \"method\": \"Immunoprecipitation-proteomics (IP-MS), siRNA double knockdown, double thymidine block/release synchronization, western blot\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — IP-MS for complex identification, cell cycle synchronization for temporal expression, single lab\",\n      \"pmids\": [\"41006702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MCPIP3/ZC3H12C overexpression inhibits cell migration and invasion in colorectal cancer cell lines (SW620, HCT116), reduces vimentin expression, and increases E-cadherin expression, indicating a role in suppressing EMT.\",\n      \"method\": \"Tet-on inducible overexpression, wound-healing assay, Transwell invasion assay, western blot for EMT markers\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — overexpression with defined cellular phenotype, single lab, no upstream mechanism identified\",\n      \"pmids\": [\"29751537\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZC3H12C/MCPIP3/Regnase-3 is an RNase (NYN/PIN domain) that post-transcriptionally regulates inflammation and cell proliferation by directly degrading target mRNAs including TNF, IL-6, Regnase-1, IκBζ, and cyclin B1 (via 3′ UTR cleavage), inhibits NF-κB and MAPK signaling in macrophages, modulates alternative splicing of STAT1, forms complexes with 14-3-3 proteins and keratin 14 to regulate keratinocyte cell cycle progression, and is reciprocally regulated by Regnase-1 which degrades MCPIP3 mRNA.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ZC3H12C (MCPIP3/Regnase-3) is an endoribonuclease of the MCPIP/Regnase family that post-transcriptionally restrains inflammation and cell proliferation by directly cleaving target mRNAs through its NYN/PIN domain. It degrades pro-inflammatory transcripts including TNF, IL-6, IκBζ, and Regnase-1 mRNAs, and is itself reciprocally regulated by Regnase-1-mediated degradation of its own mRNA, forming a mutual post-transcriptional feedback loop [PMID:34215755, PMID:34298932]. Beyond mRNA decay, ZC3H12C suppresses NF-κB and MAPK (JNK, ERK, p38) signaling in macrophages, modulates alternative splicing of STAT1 pre-mRNA, and regulates macrophage survival, migration, and phagocytosis, with conditional knockout leading to exacerbated kidney inflammation [PMID:33157351, PMID:38810592, PMID:40834429]. In keratinocytes, ZC3H12C directly cleaves cyclin B1 mRNA at its 3′ UTR to control cell cycle progression and epidermal differentiation, and forms complexes with 14-3-3 proteins and keratin 14 that cooperatively regulate G2/M transition [PMID:40200325, PMID:41006702].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"The first functional characterization showed that ZC3H12C overexpression suppresses epithelial-mesenchymal transition markers and inhibits migration/invasion in colorectal cancer cells, establishing a potential anti-tumorigenic role independent of its later-defined RNase mechanism.\",\n      \"evidence\": \"Tet-on inducible overexpression in SW620/HCT116 cells with wound-healing and Transwell assays\",\n      \"pmids\": [\"29751537\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Upstream mechanism and direct molecular targets not identified\",\n        \"No loss-of-function validation\",\n        \"Not tested in non-cancer cell contexts\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Epistasis experiments placed ZC3H12C as a negative regulator of NF-κB signaling in macrophages, downstream of the transcription factor Gfi1, revealing its role in an anti-inflammatory feedback circuit.\",\n      \"evidence\": \"Double KO of Gfi1 and Zc3h12c in macrophages with transcriptomic profiling and NF-κB pathway inactivation\",\n      \"pmids\": [\"33157351\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether NF-κB suppression is direct (RNase-dependent) or indirect was not resolved\",\n        \"Single lab study\",\n        \"Mechanism of Gfi1-mediated Zc3h12c upregulation not defined\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The core enzymatic identity of ZC3H12C was established: its NYN/PIN domain directly degrades IL-6, TNF, Regnase-1, and IκBζ mRNAs, with substrate specificity distinct from other family members (e.g., unique TNF targeting, no IL-1β degradation), and a reciprocal Regnase-1–MCPIP3 mRNA degradation loop was discovered.\",\n      \"evidence\": \"In vitro RNase assays, reporter and mRNA stability assays, MCPIP3-deficient macrophages/pDCs, imiquimod in vivo model\",\n      \"pmids\": [\"34215755\", \"34298932\", \"35048402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of substrate selectivity not determined\",\n        \"Stem-loop or cis-element requirements in target mRNAs not mapped\",\n        \"Relative contributions of RNase activity versus signaling suppression to anti-inflammatory phenotypes unclear\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In vivo genetic evidence confirmed that dendritic cell-intrinsic ZC3H12C restrains TNF-driven lymphadenopathy, linking its RNase activity to a physiological immune phenotype rescuable by Tnf deletion.\",\n      \"evidence\": \"DC-conditional KO mice (GFP knock-in), lymphadenopathy phenotyping, genetic epistasis via Tnf deletion rescue\",\n      \"pmids\": [\"35048402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ZC3H12C acts on TNF mRNA cotranscriptionally or post-export not resolved\",\n        \"Redundancy with Regnase-1 in DCs not systematically tested\",\n        \"Upstream signals activating ZC3H12C in DCs undefined\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"ZC3H12C was shown to suppress not only NF-κB but also JNK, ERK, and p38 MAPK pathways and TNF-α promoter activity in LPS-stimulated macrophages, broadening its anti-inflammatory mechanism beyond mRNA decay to signaling pathway inhibition.\",\n      \"evidence\": \"Overexpression/depletion in macrophages, luciferase reporter for TNF-α promoter, western blot for MAPK/NF-κB signaling\",\n      \"pmids\": [\"38810592\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether MAPK suppression is a direct effect or secondary to mRNA degradation of upstream regulators not distinguished\",\n        \"Single lab with overexpression/depletion approach\",\n        \"No identification of direct protein-level interactions with MAPK components\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The functional scope of ZC3H12C was extended to two new contexts: in macrophages, it modulates STAT1 alternative splicing and regulates survival/migration/phagocytosis relevant to kidney injury; in keratinocytes, it directly cleaves cyclin B1 mRNA 3′ UTR and forms complexes with 14-3-3 and keratin 14 to control G2/M cell cycle progression and epidermal differentiation.\",\n      \"evidence\": \"Macrophage conditional KO (Tnfrsf11aCre) with scRNA-seq and in silico splicing analysis; keratinocyte-specific KO mice with reporter assays for nucleolytic cleavage; IP-MS and double thymidine block/release synchronization\",\n      \"pmids\": [\"40834429\", \"40200325\", \"41006702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which ZC3H12C, an RNase, modulates alternative splicing is unclear — direct versus indirect effects not resolved\",\n        \"Functional significance of individual 14-3-3 and keratin 14 interactions for RNase activity not tested\",\n        \"Whether cyclin B1 mRNA is a universal ZC3H12C target across cell types or keratinocyte-specific is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural determinants of ZC3H12C substrate selectivity, the mechanism by which it modulates pre-mRNA splicing, whether its signaling-suppressive and RNase activities are mechanistically separable, and its full target mRNA repertoire across cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure available for ZC3H12C\",\n        \"Genome-wide target identification (e.g., CLIP-seq) not performed\",\n        \"Separation-of-function mutations distinguishing RNase from signaling roles not generated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 2, 4, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 4, 5, 6, 7]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ZC3H12A\",\n      \"YWHAB\",\n      \"KRT14\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}