{"gene":"CCNT2","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2009,"finding":"CycT2 (CCNT2) is a non-redundant component of P-TEFb; genetic inactivation of Ccnt2 in mice causes early embryonic lethality with no surviving homozygous knockouts, and siRNA knockdown in embryonic stem cells reveals that CycT2 regulates a distinct subset of genes from CycT1, demonstrating that P-TEFb complexes containing CycT1 vs CycT2 regulate different gene programs essential for embryonic development.","method":"Gene trap knockout mouse (beta-geo insertion), siRNA knockdown in embryonic stem cells, beta-galactosidase expression tracking","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with definitive embryonic lethal phenotype, complemented by siRNA knockdown with gene expression readout; replicated across multiple crosses","pmids":["19364821"],"is_preprint":false},{"year":2014,"finding":"CCNT2, as a component of P-TEFb, acts as a functional ally of Aire in releasing paused RNA polymerase II during ectopic transcription of autoantigen genes in thymic epithelial cells; CCNT2 participates in Aire-containing complexes that include the 7SK RNA, and shRNA knockdown of CCNT2 reduces Aire-dependent transcription.","method":"Genome-scale lentiviral shRNA screen, lentigenic knockdown mice, transcriptional reporter assays, co-immunoprecipitation with 7SK RNA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-scale functional screen validated by in vivo KD mice and Co-IP; multiple orthogonal methods in one study","pmids":["24434558"],"is_preprint":false},{"year":2014,"finding":"HNRNPL physically interacts with P-TEFb components CDK9, CCNT2, HEXIM1, and the 7SK small RNA, and HNRNPL knockdown disrupts the association of 7SK RNA with Aire-containing complexes, suggesting HNRNPL helps deliver inactive P-TEFb to Aire.","method":"Co-immunoprecipitation of HNRNPL with CDK9, CCNT2, HEXIM1, and 7SK RNA; shRNA knockdown with transcriptional readout","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP interaction demonstrated; functional consequence shown by KD; single study with two orthogonal methods","pmids":["24434558"],"is_preprint":false},{"year":2021,"finding":"CCNT2 binds both the promoter and the distal enhancer (+157 kb) of VEGFA, and its silencing slows RNA Pol II elongation rate, leading to exclusion of VEGFA exons 6a and 7; this establishes CCNT2 as a regulator of VEGFA alternative splicing via modulation of RNAPII elongation rate.","method":"ChIP assay (CCNT2 at VEGFA promoter and enhancer), siRNA knockdown of CCNT2 with RT-PCR analysis of VEGFA splicing isoforms, RNAPII ChIP to assess elongation rate","journal":"NAR cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional KD with splicing readout; single lab, two orthogonal methods","pmids":["34316716"],"is_preprint":false},{"year":2016,"finding":"CCNT2 silencing in human adipocytes decreases leptin secretion and reduces mRNA expression of adipogenesis-related genes including MGLL, LIPE, PPARG, LEP, and ADIPOQ, establishing a functional role for CCNT2 in adipogenesis.","method":"siRNA-mediated CCNT2 knockdown in human adipocytes, qRT-PCR for adipogenesis gene panel, ELISA for leptin secretion","journal":"Diabetologia","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KD with defined gene expression and secretion phenotype; single lab, single study","pmids":["27627980"],"is_preprint":false},{"year":2016,"finding":"CCNT2 knockdown in rat oligodendrocyte progenitor cells (OPCs) promotes differentiation into O1+ oligodendrocytes without affecting cell cycle status, identifying CCNT2 as a functional inhibitor of OPC maturation downstream of miR-297c-5p.","method":"siRNA/shRNA knockdown of CCNT2 in rat OPCs, flow cytometry for cell cycle analysis, immunostaining for O1+ differentiation marker; luciferase reporter assay confirming miR-297c-5p targeting of CCNT2 3'UTR","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined cellular phenotype plus luciferase validation of regulatory mechanism; single lab with two orthogonal methods","pmids":["26843650"],"is_preprint":false},{"year":2017,"finding":"CCNT2 is a direct target of miR-192; dual-luciferase reporter assay confirmed miR-192 suppresses the wild-type but not mutated 3'-UTR of CCNT2, and exogenous CCNT2 expression reverses miR-192-induced G0/G1 cell cycle arrest in AML cells.","method":"Dual-luciferase reporter assay with wild-type and mutant CCNT2 3'-UTR, Western blot, rescue experiment with CCNT2 overexpression, flow cytometry for cell cycle","journal":"International journal of hematology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — luciferase validation plus rescue experiment; two orthogonal methods in a single study","pmids":["28409330"],"is_preprint":false},{"year":2011,"finding":"CCNT2 (Ccnt2) is a direct target of miR-15a in mouse spermatogenesis; miR-15a inhibits Ccnt2 expression post-transcriptionally, and the inverse expression correlation of miR-15a and Ccnt2 during postnatal testis development suggests a role in controlling early spermatogenesis.","method":"Luciferase reporter assay for miR-15a targeting of Ccnt2 3'UTR, qRT-PCR and Western blot profiling in developing mouse testes","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct luciferase validation of miRNA-target interaction with expression correlation in vivo; single lab","pmids":["21740905"],"is_preprint":false},{"year":2021,"finding":"NRF2 binds to the promoter of miR-29a-3p (confirmed by ChIP assay), which in turn targets CCNT2 (confirmed by dual-luciferase reporter), establishing an NRF2/miR-29a-3p/CCNT2 axis in myocardial ischemia-reperfusion injury; restoration of NRF2 or miR-29a-3p suppresses CCNT2 and attenuates cardiomyocyte apoptosis.","method":"ChIP assay for NRF2 binding to miR-29a-3p promoter, dual-luciferase reporter for miR-29a-3p targeting CCNT2 3'UTR, rat MI/RI model with overexpression plasmids, H/R cardiomyocyte model","journal":"BioFactors (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase plus in vivo/in vitro functional models; single lab with multiple orthogonal methods","pmids":["33600051"],"is_preprint":false},{"year":2018,"finding":"CCNT2 is a direct target of miR-142-3p in gastric cancer cells; dual-luciferase assay confirmed suppression of wild-type but not mutant CCNT2 3'-UTR, and miR-142-3p overexpression downregulates CCNT2 protein, inhibiting proliferation, invasion, and migration.","method":"Dual-luciferase reporter assay, Western blot, miR-142-3p overexpression in gastric cancer cell lines","journal":"Oncology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — luciferase validation and KD phenotype in single lab; no rescue experiment to confirm specificity","pmids":["29849811"],"is_preprint":false},{"year":2020,"finding":"CCNT2 is a direct target of miR-188-5p in osteosarcoma; dual-luciferase reporter assay confirmed the binding, and exogenous CCNT2 expression partially reverses the anti-proliferative and cell-cycle-arresting effects of miR-188-5p overexpression.","method":"Dual-luciferase reporter assay, CCK-8 proliferation assay, flow cytometry, rescue experiment with CCNT2 overexpression","journal":"European review for medical and pharmacological sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — luciferase validation plus rescue; single lab, standard miRNA-target study","pmids":["31957815"],"is_preprint":false},{"year":2020,"finding":"miR-212-5p directly targets CCNT2 (confirmed by luciferase reporter), and restoration of CCNT2 attenuates miR-212-5p-induced apoptosis in AML cells; decitabine treatment upregulates miR-212-5p and downregulates CCNT2, linking the drug's anti-leukemic mechanism to the miR-212-5p/CCNT2 axis.","method":"Luciferase reporter assay, Western blot, flow cytometry for apoptosis, CCK-8 assay, CCNT2 rescue overexpression","journal":"Open life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — luciferase plus rescue in single lab; standard miRNA-target approach","pmids":["33817287"],"is_preprint":false}],"current_model":"CCNT2 encodes Cyclin T2, the regulatory subunit of a distinct P-TEFb (CDK9/CycT2) complex that is non-redundant with the CycT1-containing form; it is essential for embryogenesis and promotes transcriptional elongation by RNA Pol II, participates in Aire-dependent polymerase release in thymic epithelial cells (in complex with 7SK RNA and HEXIM1), controls VEGFA alternative splicing by modulating RNAPII elongation rate, and regulates adipogenesis and oligodendrocyte differentiation, with its levels post-transcriptionally controlled by multiple miRNAs (miR-15a, miR-192, miR-142-3p, miR-188-5p, miR-297c-5p, miR-29a-3p, miR-212-5p) that target its 3'-UTR."},"narrative":{"mechanistic_narrative":"CCNT2 (Cyclin T2) is the regulatory cyclin subunit of a distinct, non-redundant form of the P-TEFb complex that drives RNA polymerase II transcriptional elongation, controlling a gene program separate from the CycT1-containing complex and required for mammalian embryonic development [PMID:19364821]. As part of P-TEFb, CCNT2 promotes release of paused RNA Pol II, functioning as an ally of Aire in the ectopic transcription of autoantigen genes in thymic epithelial cells; in this context it resides in Aire-associated complexes together with the inhibitory 7SK small RNA and HEXIM1, with HNRNPL physically engaging CDK9, CCNT2, HEXIM1, and 7SK to deliver inactive P-TEFb to Aire [PMID:24434558]. Consistent with a role in setting elongation kinetics, CCNT2 occupies both the promoter and a distal enhancer of VEGFA, and its loss slows Pol II elongation rate to shift VEGFA alternative splicing [PMID:34316716]. Beyond transcription, CCNT2 acts as a functional brake on differentiation: its depletion drives oligodendrocyte progenitor maturation and alters adipogenic gene expression and leptin secretion [PMID:27627980, PMID:26843650]. CCNT2 protein levels are post-transcriptionally constrained through its 3'-UTR by multiple microRNAs, including miR-15a and miR-192 [PMID:28409330, PMID:21740905].","teleology":[{"year":2009,"claim":"Established that CCNT2 is not redundant with CycT1 but defines a functionally distinct P-TEFb complex with its own essential gene program, resolving whether the two cyclin T paralogs are interchangeable.","evidence":"Gene-trap knockout mouse and siRNA knockdown with gene-expression readout in embryonic stem cells","pmids":["19364821"],"confidence":"High","gaps":["The specific CycT2-dependent target genes driving embryonic lethality were not defined","No structural or biochemical basis for CycT1 vs CycT2 target selectivity"]},{"year":2014,"claim":"Placed CCNT2 mechanistically within Aire-dependent autoantigen transcription, showing P-TEFb release of paused Pol II as the step Aire co-opts, and identified HNRNPL as the factor delivering 7SK-bound inactive P-TEFb.","evidence":"Genome-scale shRNA screen, in vivo knockdown mice, transcriptional reporters, and Co-IP with 7SK RNA and HNRNPL","pmids":["24434558"],"confidence":"High","gaps":["Direct enzymatic activation of CDK9 by Aire engagement not demonstrated","HNRNPL interaction (idx 2) rests on Co-IP without reciprocal structural validation"]},{"year":2021,"claim":"Connected CCNT2's elongation-control activity to co-transcriptional RNA processing, demonstrating that P-TEFb-set Pol II speed governs VEGFA exon inclusion.","evidence":"ChIP at VEGFA promoter and enhancer, siRNA knockdown with splicing RT-PCR, and Pol II ChIP for elongation rate","pmids":["34316716"],"confidence":"Medium","gaps":["Single lab, not independently replicated","Generality to other alternatively spliced genes not established"]},{"year":2016,"claim":"Extended CCNT2 function beyond transcription per se to cell-fate decisions, showing it restrains oligodendrocyte progenitor differentiation and supports the adipogenic program.","evidence":"siRNA/shRNA knockdown in rat OPCs and human adipocytes with differentiation marker, gene-panel, and secretion readouts; luciferase confirmation of miR-297c-5p targeting","pmids":["26843650","27627980"],"confidence":"Medium","gaps":["Mechanism linking CCNT2 transcriptional activity to specific differentiation gene programs unresolved","Each phenotype shown in a single lab/model"]},{"year":2021,"claim":"Built up the picture of CCNT2 as a post-transcriptionally constrained node whose 3'-UTR is targeted by numerous microRNAs across tissues and cancers.","evidence":"Dual-luciferase 3'-UTR reporter assays (wild-type vs mutant), Western blot, and rescue/overexpression in spermatogenesis, AML, gastric cancer, osteosarcoma, and cardiomyocyte models","pmids":["28409330","21740905","33600051","29849811","31957815","33817287"],"confidence":"Medium","gaps":["Whether these miRNAs act on CCNT2 simultaneously or context-specifically is unknown","Several individual axes (idx 9, 10, 11) are Low-confidence single-lab miRNA studies","Downstream transcriptional consequences of CCNT2 loss in these settings not mapped"]},{"year":null,"claim":"How CycT2-containing P-TEFb selects its distinct gene program and how that selectivity is structurally and biochemically distinguished from CycT1 remains open.","evidence":"No timeline discovery resolves the molecular basis of CycT1/CycT2 target discrimination","pmids":[],"confidence":"Low","gaps":["No structural model of CycT2-CDK9 versus CycT1-CDK9","No genome-wide map of CycT2-specific Pol II elongation targets"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,5]}],"complexes":["P-TEFb"],"partners":["CDK9","HEXIM1","HNRNPL","AIRE"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60583","full_name":"Cyclin-T2","aliases":[],"length_aa":730,"mass_kda":81.0,"function":"Regulatory subunit of the cyclin-dependent kinase pair (CDK9/cyclin T) complex, also called positive transcription elongation factor B (P-TEFB), which is proposed to facilitate the transition from abortive to production elongation by phosphorylating the CTD (carboxy-terminal domain) of the large subunit of RNA polymerase II (RNAP II) (PubMed:15563843, PubMed:9499409). The activity of this complex is regulated by binding with 7SK snRNA (PubMed:11713533). Plays a role during muscle differentiation; P-TEFB complex interacts with MYOD1; this tripartite complex promotes the transcriptional activity of MYOD1 through its CDK9-mediated phosphorylation and binds the chromatin of promoters and enhancers of muscle-specific genes; this event correlates with hyperphosphorylation of the CTD domain of RNA pol II (By similarity). In addition, enhances MYOD1-dependent transcription through interaction with PKN1 (PubMed:16331689). Involved in early embryo development (By similarity) (Microbial infection) Promotes transcriptional activation of early and late herpes simplex virus 1/HHV-1 promoters","subcellular_location":"Cytoplasm, perinuclear region; Nucleus","url":"https://www.uniprot.org/uniprotkb/O60583/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CCNT2","classification":"Not Classified","n_dependent_lines":17,"n_total_lines":1208,"dependency_fraction":0.014072847682119206},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CDK9","stoichiometry":0.2},{"gene":"LARP7","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CCNT2","total_profiled":1310},"omim":[{"mim_id":"615695","title":"HEXAMETHYLENE BIS ACETAMIDE-INDUCIBLE PROTEIN 2; HEXIM2","url":"https://www.omim.org/entry/615695"},{"mim_id":"615657","title":"MICRO RNA 142; MIR142","url":"https://www.omim.org/entry/615657"},{"mim_id":"610782","title":"MICRO RNA 29A; MIR29A","url":"https://www.omim.org/entry/610782"},{"mim_id":"607328","title":"HEXAMETHYLENE BIS ACETAMIDE-INDUCIBLE PROTEIN 1; HEXIM1","url":"https://www.omim.org/entry/607328"},{"mim_id":"603862","title":"CYCLIN T2; CCNT2","url":"https://www.omim.org/entry/603862"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CCNT2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O60583","domains":[{"cath_id":"1.10.472.10","chopping":"10-149","consensus_level":"medium","plddt":95.7727,"start":10,"end":149},{"cath_id":"1.10.472.10","chopping":"151-263","consensus_level":"medium","plddt":90.7386,"start":151,"end":263}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60583","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60583-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60583-F1-predicted_aligned_error_v6.png","plddt_mean":58.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CCNT2","jax_strain_url":"https://www.jax.org/strain/search?query=CCNT2"},"sequence":{"accession":"O60583","fasta_url":"https://rest.uniprot.org/uniprotkb/O60583.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60583/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60583"}},"corpus_meta":[{"pmid":"24434558","id":"PMC_24434558","title":"An 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diseases","url":"https://pubmed.ncbi.nlm.nih.gov/41761439","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17645,"output_tokens":3180,"usd":0.050318,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10556,"output_tokens":2444,"usd":0.05694,"stage2_stop_reason":"end_turn"},"total_usd":0.107258,"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\": 2009,\n      \"finding\": \"CycT2 (CCNT2) is a non-redundant component of P-TEFb; genetic inactivation of Ccnt2 in mice causes early embryonic lethality with no surviving homozygous knockouts, and siRNA knockdown in embryonic stem cells reveals that CycT2 regulates a distinct subset of genes from CycT1, demonstrating that P-TEFb complexes containing CycT1 vs CycT2 regulate different gene programs essential for embryonic development.\",\n      \"method\": \"Gene trap knockout mouse (beta-geo insertion), siRNA knockdown in embryonic stem cells, beta-galactosidase expression tracking\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with definitive embryonic lethal phenotype, complemented by siRNA knockdown with gene expression readout; replicated across multiple crosses\",\n      \"pmids\": [\"19364821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CCNT2, as a component of P-TEFb, acts as a functional ally of Aire in releasing paused RNA polymerase II during ectopic transcription of autoantigen genes in thymic epithelial cells; CCNT2 participates in Aire-containing complexes that include the 7SK RNA, and shRNA knockdown of CCNT2 reduces Aire-dependent transcription.\",\n      \"method\": \"Genome-scale lentiviral shRNA screen, lentigenic knockdown mice, transcriptional reporter assays, co-immunoprecipitation with 7SK RNA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-scale functional screen validated by in vivo KD mice and Co-IP; multiple orthogonal methods in one study\",\n      \"pmids\": [\"24434558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HNRNPL physically interacts with P-TEFb components CDK9, CCNT2, HEXIM1, and the 7SK small RNA, and HNRNPL knockdown disrupts the association of 7SK RNA with Aire-containing complexes, suggesting HNRNPL helps deliver inactive P-TEFb to Aire.\",\n      \"method\": \"Co-immunoprecipitation of HNRNPL with CDK9, CCNT2, HEXIM1, and 7SK RNA; shRNA knockdown with transcriptional readout\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP interaction demonstrated; functional consequence shown by KD; single study with two orthogonal methods\",\n      \"pmids\": [\"24434558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCNT2 binds both the promoter and the distal enhancer (+157 kb) of VEGFA, and its silencing slows RNA Pol II elongation rate, leading to exclusion of VEGFA exons 6a and 7; this establishes CCNT2 as a regulator of VEGFA alternative splicing via modulation of RNAPII elongation rate.\",\n      \"method\": \"ChIP assay (CCNT2 at VEGFA promoter and enhancer), siRNA knockdown of CCNT2 with RT-PCR analysis of VEGFA splicing isoforms, RNAPII ChIP to assess elongation rate\",\n      \"journal\": \"NAR cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional KD with splicing readout; single lab, two orthogonal methods\",\n      \"pmids\": [\"34316716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCNT2 silencing in human adipocytes decreases leptin secretion and reduces mRNA expression of adipogenesis-related genes including MGLL, LIPE, PPARG, LEP, and ADIPOQ, establishing a functional role for CCNT2 in adipogenesis.\",\n      \"method\": \"siRNA-mediated CCNT2 knockdown in human adipocytes, qRT-PCR for adipogenesis gene panel, ELISA for leptin secretion\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KD with defined gene expression and secretion phenotype; single lab, single study\",\n      \"pmids\": [\"27627980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCNT2 knockdown in rat oligodendrocyte progenitor cells (OPCs) promotes differentiation into O1+ oligodendrocytes without affecting cell cycle status, identifying CCNT2 as a functional inhibitor of OPC maturation downstream of miR-297c-5p.\",\n      \"method\": \"siRNA/shRNA knockdown of CCNT2 in rat OPCs, flow cytometry for cell cycle analysis, immunostaining for O1+ differentiation marker; luciferase reporter assay confirming miR-297c-5p targeting of CCNT2 3'UTR\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined cellular phenotype plus luciferase validation of regulatory mechanism; single lab with two orthogonal methods\",\n      \"pmids\": [\"26843650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCNT2 is a direct target of miR-192; dual-luciferase reporter assay confirmed miR-192 suppresses the wild-type but not mutated 3'-UTR of CCNT2, and exogenous CCNT2 expression reverses miR-192-induced G0/G1 cell cycle arrest in AML cells.\",\n      \"method\": \"Dual-luciferase reporter assay with wild-type and mutant CCNT2 3'-UTR, Western blot, rescue experiment with CCNT2 overexpression, flow cytometry for cell cycle\",\n      \"journal\": \"International journal of hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — luciferase validation plus rescue experiment; two orthogonal methods in a single study\",\n      \"pmids\": [\"28409330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CCNT2 (Ccnt2) is a direct target of miR-15a in mouse spermatogenesis; miR-15a inhibits Ccnt2 expression post-transcriptionally, and the inverse expression correlation of miR-15a and Ccnt2 during postnatal testis development suggests a role in controlling early spermatogenesis.\",\n      \"method\": \"Luciferase reporter assay for miR-15a targeting of Ccnt2 3'UTR, qRT-PCR and Western blot profiling in developing mouse testes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct luciferase validation of miRNA-target interaction with expression correlation in vivo; single lab\",\n      \"pmids\": [\"21740905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NRF2 binds to the promoter of miR-29a-3p (confirmed by ChIP assay), which in turn targets CCNT2 (confirmed by dual-luciferase reporter), establishing an NRF2/miR-29a-3p/CCNT2 axis in myocardial ischemia-reperfusion injury; restoration of NRF2 or miR-29a-3p suppresses CCNT2 and attenuates cardiomyocyte apoptosis.\",\n      \"method\": \"ChIP assay for NRF2 binding to miR-29a-3p promoter, dual-luciferase reporter for miR-29a-3p targeting CCNT2 3'UTR, rat MI/RI model with overexpression plasmids, H/R cardiomyocyte model\",\n      \"journal\": \"BioFactors (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase plus in vivo/in vitro functional models; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33600051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CCNT2 is a direct target of miR-142-3p in gastric cancer cells; dual-luciferase assay confirmed suppression of wild-type but not mutant CCNT2 3'-UTR, and miR-142-3p overexpression downregulates CCNT2 protein, inhibiting proliferation, invasion, and migration.\",\n      \"method\": \"Dual-luciferase reporter assay, Western blot, miR-142-3p overexpression in gastric cancer cell lines\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — luciferase validation and KD phenotype in single lab; no rescue experiment to confirm specificity\",\n      \"pmids\": [\"29849811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CCNT2 is a direct target of miR-188-5p in osteosarcoma; dual-luciferase reporter assay confirmed the binding, and exogenous CCNT2 expression partially reverses the anti-proliferative and cell-cycle-arresting effects of miR-188-5p overexpression.\",\n      \"method\": \"Dual-luciferase reporter assay, CCK-8 proliferation assay, flow cytometry, rescue experiment with CCNT2 overexpression\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — luciferase validation plus rescue; single lab, standard miRNA-target study\",\n      \"pmids\": [\"31957815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-212-5p directly targets CCNT2 (confirmed by luciferase reporter), and restoration of CCNT2 attenuates miR-212-5p-induced apoptosis in AML cells; decitabine treatment upregulates miR-212-5p and downregulates CCNT2, linking the drug's anti-leukemic mechanism to the miR-212-5p/CCNT2 axis.\",\n      \"method\": \"Luciferase reporter assay, Western blot, flow cytometry for apoptosis, CCK-8 assay, CCNT2 rescue overexpression\",\n      \"journal\": \"Open life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — luciferase plus rescue in single lab; standard miRNA-target approach\",\n      \"pmids\": [\"33817287\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCNT2 encodes Cyclin T2, the regulatory subunit of a distinct P-TEFb (CDK9/CycT2) complex that is non-redundant with the CycT1-containing form; it is essential for embryogenesis and promotes transcriptional elongation by RNA Pol II, participates in Aire-dependent polymerase release in thymic epithelial cells (in complex with 7SK RNA and HEXIM1), controls VEGFA alternative splicing by modulating RNAPII elongation rate, and regulates adipogenesis and oligodendrocyte differentiation, with its levels post-transcriptionally controlled by multiple miRNAs (miR-15a, miR-192, miR-142-3p, miR-188-5p, miR-297c-5p, miR-29a-3p, miR-212-5p) that target its 3'-UTR.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCNT2 (Cyclin T2) is the regulatory cyclin subunit of a distinct, non-redundant form of the P-TEFb complex that drives RNA polymerase II transcriptional elongation, controlling a gene program separate from the CycT1-containing complex and required for mammalian embryonic development [#0]. As part of P-TEFb, CCNT2 promotes release of paused RNA Pol II, functioning as an ally of Aire in the ectopic transcription of autoantigen genes in thymic epithelial cells; in this context it resides in Aire-associated complexes together with the inhibitory 7SK small RNA and HEXIM1, with HNRNPL physically engaging CDK9, CCNT2, HEXIM1, and 7SK to deliver inactive P-TEFb to Aire [#1, #2]. Consistent with a role in setting elongation kinetics, CCNT2 occupies both the promoter and a distal enhancer of VEGFA, and its loss slows Pol II elongation rate to shift VEGFA alternative splicing [#3]. Beyond transcription, CCNT2 acts as a functional brake on differentiation: its depletion drives oligodendrocyte progenitor maturation and alters adipogenic gene expression and leptin secretion [#4, #5]. CCNT2 protein levels are post-transcriptionally constrained through its 3'-UTR by multiple microRNAs, including miR-15a and miR-192 [#6, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established that CCNT2 is not redundant with CycT1 but defines a functionally distinct P-TEFb complex with its own essential gene program, resolving whether the two cyclin T paralogs are interchangeable.\",\n      \"evidence\": \"Gene-trap knockout mouse and siRNA knockdown with gene-expression readout in embryonic stem cells\",\n      \"pmids\": [\"19364821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The specific CycT2-dependent target genes driving embryonic lethality were not defined\",\n        \"No structural or biochemical basis for CycT1 vs CycT2 target selectivity\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed CCNT2 mechanistically within Aire-dependent autoantigen transcription, showing P-TEFb release of paused Pol II as the step Aire co-opts, and identified HNRNPL as the factor delivering 7SK-bound inactive P-TEFb.\",\n      \"evidence\": \"Genome-scale shRNA screen, in vivo knockdown mice, transcriptional reporters, and Co-IP with 7SK RNA and HNRNPL\",\n      \"pmids\": [\"24434558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct enzymatic activation of CDK9 by Aire engagement not demonstrated\",\n        \"HNRNPL interaction (idx 2) rests on Co-IP without reciprocal structural validation\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected CCNT2's elongation-control activity to co-transcriptional RNA processing, demonstrating that P-TEFb-set Pol II speed governs VEGFA exon inclusion.\",\n      \"evidence\": \"ChIP at VEGFA promoter and enhancer, siRNA knockdown with splicing RT-PCR, and Pol II ChIP for elongation rate\",\n      \"pmids\": [\"34316716\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab, not independently replicated\",\n        \"Generality to other alternatively spliced genes not established\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended CCNT2 function beyond transcription per se to cell-fate decisions, showing it restrains oligodendrocyte progenitor differentiation and supports the adipogenic program.\",\n      \"evidence\": \"siRNA/shRNA knockdown in rat OPCs and human adipocytes with differentiation marker, gene-panel, and secretion readouts; luciferase confirmation of miR-297c-5p targeting\",\n      \"pmids\": [\"26843650\", \"27627980\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking CCNT2 transcriptional activity to specific differentiation gene programs unresolved\",\n        \"Each phenotype shown in a single lab/model\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Built up the picture of CCNT2 as a post-transcriptionally constrained node whose 3'-UTR is targeted by numerous microRNAs across tissues and cancers.\",\n      \"evidence\": \"Dual-luciferase 3'-UTR reporter assays (wild-type vs mutant), Western blot, and rescue/overexpression in spermatogenesis, AML, gastric cancer, osteosarcoma, and cardiomyocyte models\",\n      \"pmids\": [\"28409330\", \"21740905\", \"33600051\", \"29849811\", \"31957815\", \"33817287\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether these miRNAs act on CCNT2 simultaneously or context-specifically is unknown\",\n        \"Several individual axes (idx 9, 10, 11) are Low-confidence single-lab miRNA studies\",\n        \"Downstream transcriptional consequences of CCNT2 loss in these settings not mapped\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CycT2-containing P-TEFb selects its distinct gene program and how that selectivity is structurally and biochemically distinguished from CycT1 remains open.\",\n      \"evidence\": \"No timeline discovery resolves the molecular basis of CycT1/CycT2 target discrimination\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of CycT2-CDK9 versus CycT1-CDK9\",\n        \"No genome-wide map of CycT2-specific Pol II elongation targets\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"complexes\": [\"P-TEFb\"],\n    \"partners\": [\"CDK9\", \"HEXIM1\", \"HNRNPL\", \"AIRE\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}