{"gene":"CDK19","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2019,"finding":"CDK8 and CDK19 have mechanistically distinct roles in IFN-γ transcriptional responses: CDK8 kinase activity promotes RNA polymerase II pause release and phosphorylates STAT1 at Ser727, whereas CDK19 regulates IFN-γ-responsive genes through a kinase-independent scaffolding function.","method":"GRO-seq, PRO-seq, chemical genetics (cortistatin A), transcriptomics, STAT1 phosphorylation assays; decoupling of CDK8 vs CDK19 functions","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (GRO-seq, PRO-seq, chemical genetics, phosphoproteomics) in a single rigorous study; enzymatic vs scaffolding roles directly demonstrated","pmids":["31495563"],"is_preprint":false},{"year":2018,"finding":"CDK8 and CDK19 function within a 4-protein Mediator kinase module (with CCNC, MED12, MED13); CCNC and MED12 activate CDK8/CDK19 kinase function, and MED13 enables their association with the Mediator complex. They affect RNA Pol II transcription indirectly by phosphorylating transcription factors and controlling Mediator structure.","method":"Biochemical characterization, review of genetic and biochemical studies; complex composition established by prior co-purification and functional assays","journal":"Transcription","confidence":"High","confidence_rationale":"Tier 2 / Strong — extensively replicated across multiple labs; complex composition and activation mechanism established by multiple orthogonal studies cited within this review","pmids":["30585107"],"is_preprint":false},{"year":2015,"finding":"CCT251545 is a potent and selective inhibitor of CDK8 and CDK19 with >100-fold selectivity over 291 other kinases. X-ray crystallography shows a type 1 binding mode involving insertion of the CDK8 C-terminus into the ligand binding site. CDK8/CDK19 inhibition alters WNT pathway gene expression and phosphorylation of STAT1(Ser727), established as a biomarker of CDK8/CDK19 kinase activity in vitro and in vivo.","method":"X-ray crystallography, kinase selectivity profiling (291 kinases), cell-based gene expression assays, in vivo WNT tumor model","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus broad kinase selectivity profiling plus in vivo validation; multiple orthogonal methods in a single rigorous study","pmids":["26502155"],"is_preprint":false},{"year":2008,"finding":"CDK19 (referred to as hCDK11 in this study, the Mediator-associated paralog of CDK8) independently forms Mediator complexes devoid of CDK8. siRNA knockdown showed that CDK8 and CDK19 have opposing functions in VP16-dependent transcriptional regulation.","method":"Epitope-tagged CDK19 purification from HeLa cells, co-purification of Mediator complex, siRNA knockdown, luciferase transcription assay","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-purification plus functional siRNA knockdown; single lab but two orthogonal methods","pmids":["18651850"],"is_preprint":false},{"year":2023,"finding":"CDK8 and CDK19 have qualitatively the same effects on protein phosphorylation and gene expression; differential effects of CDK8 vs CDK19 knockouts are attributable to quantitative differences in expression and activity rather than different functions. Both CDK8 and CDK19 protect their binding partner cyclin C from proteolytic degradation in a kinase-independent manner.","method":"Transcriptomics, proteomics, phosphoproteomics; CDK8/CDK19 genetic knockouts, selective small-molecule inhibitors, CDK8/19 PROTAC degrader, isogenic cell populations expressing kinase-inactive mutants","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — comprehensive multi-omics with genetic and pharmacological tools, kinase-dead mutants, PROTAC degradation; multiple orthogonal methods in single study","pmids":["37378433"],"is_preprint":false},{"year":2022,"finding":"CDK8 and CDK19 function redundantly to regulate intestinal lineage specification. The Mediator kinase module binds and phosphorylates key components of the SWI/SNF chromatin remodeling complex in intestinal epithelial cells; SWI/SNF and MED12-Mediator colocalize at lineage-specifying enhancers in a CDK8/19-dependent manner.","method":"Genetically defined mouse models, pharmacological CDK8/19 inhibitors, phosphorylation assays of SWI/SNF components, ChIP-seq for MED12 and SWI/SNF colocalization","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic models plus biochemical phosphorylation assays plus ChIP-seq; multiple orthogonal methods with in vivo validation","pmids":["36006697"],"is_preprint":false},{"year":2019,"finding":"Inhibition of CDK8/CDK19 kinase activity promotes Treg cell differentiation via sensitized TGF-β signaling, associated with attenuation of IFN-γ–STAT1 signaling and enhancement of phosphorylated SMAD2/3.","method":"Small-molecule CDK8/19 inhibitors (CCT251921, Senexin A), flow cytometry for Treg differentiation, phospho-SMAD2/3 and phospho-STAT1 immunoblot, EAE mouse model","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition plus in vivo mouse model plus phosphorylation readouts; single lab, two orthogonal approaches","pmids":["31552016"],"is_preprint":false},{"year":2018,"finding":"CDK8 and CDK19 (Mediator kinases) are required for BMP4-induced EMT; both genetic and pharmacological inhibition of CDK8/CDK19 abrogates BMP-induced EMT, YAP nuclear localization, and tumor cell invasion. CDK8/CDK19 mediate SMAD1-driven EMT in a YAP1-dependent manner.","method":"siRNA/shRNA knockdown, CDK8/19 selective inhibitor treatment, in vitro invasion assays, in vivo syngeneic EMT model, RNA-seq","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological inhibition combined with in vivo model; single lab, multiple orthogonal methods","pmids":["29780169"],"is_preprint":false},{"year":2022,"finding":"CDK19 interacts with p53 and inhibits p53-mediated transcription of p21 in hematopoietic stem cells (HSCs). CDK19 knockout mice show activated p53 signaling and impaired HSC proliferation/self-renewal; a specific p53 inhibitor partially rescues CDK19-null HSC defects.","method":"CDK19 knockout mice, co-immunoprecipitation (CDK19-p53 interaction), CDK8/19 inhibitor SenexinB, p53 inhibitor rescue experiments, flow cytometry","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP for interaction, genetic KO with defined phenotype, epistasis rescue; single lab, multiple orthogonal methods","pmids":["35110726"],"is_preprint":false},{"year":2020,"finding":"CDK19 de novo missense variants (Tyr32His, Thr31Asn, Thr196Ala) cause a syndromic neurodevelopmental disorder. In Drosophila, human CDK19 fully rescues loss of the CDK19 ortholog Cdk8 (larval lethality, seizures, reduced lifespan, loss of NMJ boutons), while disease-associated CDK19 variants fail to rescue and behave as loss-of-function alleles.","method":"Drosophila genetic complementation, neuronal RNAi knockdown of Cdk8, rescue with human CDK19 WT vs. variant cDNA, neuromuscular junction morphology analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic complementation with WT and disease variant constructs; multiple phenotypic readouts in a rigorous model organism study","pmids":["32330417"],"is_preprint":false},{"year":2021,"finding":"Disease-associated CDK19 variants show altered kinase activity: the Gly28Arg substitution reduces kinase activity and the Tyr32His substitution increases kinase activity compared to wild-type, as measured by in vitro autophosphorylation and substrate phosphorylation assays. Both variants cause morphological abnormalities in zebrafish.","method":"In vitro autophosphorylation and substrate phosphorylation assays, zebrafish mRNA injection morphology assay","journal":"Genetics in medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro kinase assays for both LoF and GoF variants, supported by in vivo zebrafish model; single lab but two orthogonal methods","pmids":["33495529"],"is_preprint":false},{"year":2024,"finding":"Drosophila Cdk8 (the ortholog of human CDK8 and CDK19) promotes mitochondrial fission through phosphorylation of Drp1 at Ser616. Human CDK19 can rescue neuronal Cdk8 loss (reduced lifespan, bang sensitivity), including cytoplasmic localization in neurons. Cdk8/CDK19 overexpression suppresses Pink1-deficiency phenotypes (elevated ROS, mitochondrial dysmorphology).","method":"Drosophila genetic models, endogenous GFP-tagged Cdk8 localization, Drp1 phosphorylation assays, Pink1 epistasis, ROS measurement, mitochondrial morphology analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic models with epistasis, direct phosphorylation assay, subcellular localization; multiple orthogonal methods with in vivo validation","pmids":["38637532"],"is_preprint":false},{"year":2022,"finding":"CDK8 and CDK19 act redundantly to regulate CFTR pathway gene expression in intestinal epithelium. Combined deletion of CDK8 and CDK19 in intestinal organoids leads to mucus accumulation, increased goblet cell secretion, and downregulation of CFTR expression and function, while individual deletions show limited effects.","method":"Mouse genetic models (CDK8 KO, CDK19 KO, double KO), intestinal organoids, pharmacological CDK8/19 inhibition, CFTR functional assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-KO models with functional readouts in vivo and in vitro; pharmacological corroboration; multiple orthogonal methods","pmids":["36545778"],"is_preprint":false},{"year":2025,"finding":"CDK8 and CDK19 are required for normal macrophage differentiation; double knockout (DKO) mice lacking both Cdk8 and Cdk19 in hematopoietic cells show expansion of splenic macrophages, altered cytokine secretion, deregulated gene expression, precocious cell cycle exit, and impaired Fc-mediated phagocytosis in bone marrow-derived macrophages.","method":"Hematopoietic-specific CDK8/CDK19 double knockout mice, gene expression analysis, phagocytosis assays, flow cytometry, cytokine secretion assays","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic DKO with defined cellular phenotypes; single lab, multiple readouts","pmids":["41123539"],"is_preprint":false},{"year":2025,"finding":"CDK8 and CDK19 phosphorylate serine residues of STAT5 in ILC2s, promoting their activation and cytokine production (IL-5, IL-13). CDK8/19 inhibition suppresses STAT5 serine phosphorylation and ILC2 activation, reducing lung fibrosis in an OVA-induced asthmatic mouse model.","method":"CDK8/19 inhibitor AS3334366, OVA-induced asthmatic mouse model, ILC2-deficient mouse model, phospho-STAT5 (serine) assays, cytokine production measurements","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition plus genetic ILC2-deficient model plus phosphorylation assays; single lab, in vivo corroboration","pmids":["40795210"],"is_preprint":false},{"year":2019,"finding":"CDK19 inhibition (siRNA knockdown and CDK8/19 inhibitor) significantly decreases migration and invasion of prostate cancer cell lines.","method":"siRNA-mediated CDK19 knockdown, selective CDK8/19 inhibitor treatment, migration and invasion assays, RNAseq","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological inhibition with functional readouts; single lab, two orthogonal approaches","pmids":["27678455"],"is_preprint":false},{"year":2025,"finding":"CDK8/CDK19 inhibition with AS2863619 promotes conversion of CD4+CD25- effector T cells into Foxp3+ Tregs via STAT5 phosphorylation; STAT5 blockade abrogates this effect. CDK8/CDK19 inhibition also suppresses STAT3 phosphorylation under IL-6 conditions, attenuating Th17 polarization. These mechanisms were confirmed in a murine ITP model.","method":"Small-molecule CDK8/19 inhibitor AS2863619, flow cytometry, STAT5/STAT3 phosphorylation assays, transcriptomics, metabolic analysis, murine ITP model","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with mechanistic phosphorylation readouts and in vivo model; single lab, multiple orthogonal methods","pmids":["41770851"],"is_preprint":false},{"year":2025,"finding":"In prostate aging, GRHL2 promotes CDK19 transcription; CDK19 sequesters p53, suppressing p21Waf1/Cip1 expression. Aging-related downregulation of GRHL2 releases p53 from the CDK19-p53 complex, activating p21 transcription and inducing cell senescence. A GRHL2-based gene therapy delayed prostate aging in vivo.","method":"Single-nucleus transcriptomics, co-immunoprecipitation (CDK19-p53 complex), CDK19 overexpression/knockdown, in vivo gene therapy in primates","journal":"Nature aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for CDK19-p53 interaction plus genetic manipulation plus in vivo gene therapy; single lab, multiple orthogonal methods","pmids":["41266629"],"is_preprint":false},{"year":2025,"finding":"NUDT21 promotes generation of CDK19 mRNA isoforms with long 3'UTR by directing distal polyadenylation sites; the long 3'UTR facilitates cytoplasmic export and efficient translation of CDK19 transcripts (without affecting stability), thereby driving cholesterol biosynthesis and immune evasion in colorectal cancer.","method":"CRISPR/Cas9 screening, APA analysis, RNA export assays, polysome profiling, CDK19 3'UTR truncation, CDK19 overexpression rescue","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR screen plus mechanistic follow-up with APA, RNA export, and translation assays; single lab, multiple orthogonal methods","pmids":["41255211"],"is_preprint":false},{"year":2026,"finding":"CDK8 and CDK19 are required for hepatitis delta virus (HDV) replication; their loss prevents establishment of HDV replication in cell culture models and reduces HDV RNA synthesis. CDK8/19 inactivation reduces phosphorylation of the C-terminal domain of Pol II. Ectopic expression of small HDAg (but not its methylation site R13 mutant) restores HDV replication in CDK8/19-deficient cells.","method":"Selective CDK8/19 inhibitor MSC2530818, CDK8/19 genetic knockouts, HDV replication assays in multiple cell culture models, Pol II CTD phosphorylation assays","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic CDK8/19 inhibition with mechanistic Pol II phosphorylation readout; single lab, two orthogonal approaches","pmids":["41665877"],"is_preprint":false},{"year":2021,"finding":"CDK19 haploinsufficiency (caused by chromosomal inversion disrupting the CDK19 gene) is associated with microcephaly, congenital retinal folds, and mental retardation. CDK19 is expressed in fetal eye and fetal brain. Drosophila cdk8 (the ortholog) knockdown in multiple dendrite neurons reduced dendritic branching by 35% and altered dendritic arbour morphology.","method":"Karyotyping, FISH mapping of chromosomal breakpoints, quantitative RT-PCR (50% transcript reduction in patient cells), Drosophila conditional cdk8 knockdown in md neurons","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chromosomal disruption mapped to CDK19, qPCR confirms haploinsufficiency, Drosophila functional experiments confirm neuronal role; single lab but multiple methods","pmids":["20563892"],"is_preprint":false}],"current_model":"CDK19 is a cyclin-dependent kinase that, together with its paralog CDK8 and the proteins CCNC, MED12, and MED13, forms the Mediator kinase module; CDK19 phosphorylates transcription factors (including STAT1, STAT5, SMAD2/3) and SWI/SNF complex components to regulate signal-responsive gene expression, exerts a kinase-independent scaffolding role to control distinct gene sets (e.g., in IFN-γ responses), protects cyclin C from proteolytic degradation, interacts with p53 to suppress p21-mediated senescence, and—unexpectedly—functions in the cytoplasm to phosphorylate Drp1 at Ser616 and promote mitochondrial fission, while disease-associated CDK19 variants that alter its kinase activity cause neurodevelopmental disorders with epileptic encephalopathy."},"narrative":{"mechanistic_narrative":"CDK19 is a cyclin-dependent kinase that, with its paralog CDK8, constitutes the catalytic core of the Mediator kinase module, a four-protein assembly with CCNC, MED12, and MED13 in which CCNC and MED12 activate kinase function and MED13 tethers the module to Mediator to regulate RNA Pol II transcription indirectly [PMID:30585107]. CDK19 assembles into Mediator complexes distinct from those containing CDK8 [PMID:18651850], and across phosphoproteomic and genetic analyses CDK8 and CDK19 produce qualitatively equivalent effects on phosphorylation and gene expression, with apparent differences reflecting quantitative expression and activity rather than divergent functions; both also protect their partner cyclin C from proteolytic degradation in a kinase-independent manner [PMID:37378433]. Beyond canonical transcriptional control, CDK19 governs signal-responsive programs by phosphorylating transcription factors and chromatin machinery — STAT1(Ser727) as a readout of kinase activity [PMID:26502155], STAT5 serine residues to drive ILC2 activation [PMID:40795210], STAT5/STAT3 in T-cell fate decisions [PMID:41770851], and SWI/SNF components at lineage-specifying enhancers [PMID:36006697] — and it also acts through a kinase-independent scaffolding mode to regulate a distinct set of IFN-γ-responsive genes [PMID:31495563]. CDK19 additionally interacts physically with p53 to suppress p21-mediated senescence [PMID:35110726, PMID:41266629] and, unexpectedly, localizes to the cytoplasm in neurons where the ortholog phosphorylates Drp1 at Ser616 to promote mitochondrial fission [PMID:38637532]. De novo missense variants that alter CDK19 kinase activity cause a syndromic neurodevelopmental disorder with epileptic features, behaving as loss- or gain-of-function alleles in model organisms [PMID:32330417, PMID:33495529].","teleology":[{"year":2008,"claim":"Established that CDK19 is a bona fide Mediator-associated kinase that assembles into Mediator complexes independent of its paralog CDK8 and exerts distinct transcriptional effects.","evidence":"Epitope-tagged CDK19 purification, Mediator co-purification, siRNA knockdown, and luciferase reporter assays in HeLa cells","pmids":["18651850"],"confidence":"Medium","gaps":["Did not resolve whether opposing CDK8/CDK19 effects reflect intrinsic functional divergence or quantitative differences","Single lab; substrate specificity not addressed"]},{"year":2015,"claim":"Defined a selective chemical probe and structural binding mode for CDK8/CDK19 and validated STAT1(Ser727) as a pharmacodynamic biomarker of their kinase activity.","evidence":"X-ray crystallography, kinase selectivity profiling across 291 kinases, cell-based gene expression, and an in vivo WNT tumor model","pmids":["26502155"],"confidence":"High","gaps":["CCT251545 does not discriminate CDK8 from CDK19","Direct CDK19 substrate repertoire not enumerated"]},{"year":2018,"claim":"Consolidated the Mediator kinase module architecture, showing CCNC/MED12 activate the kinases and MED13 couples them to Mediator, defining how CDK19 influences Pol II transcription indirectly.","evidence":"Biochemical characterization and synthesis of co-purification and functional studies","pmids":["30585107"],"confidence":"High","gaps":["Review-level synthesis; does not isolate CDK19-specific contributions within the module"]},{"year":2019,"claim":"Distinguished CDK19's kinase-independent scaffolding role from CDK8's enzymatic role in IFN-γ transcription, revealing functional non-equivalence at specific gene sets.","evidence":"GRO-seq, PRO-seq, chemical genetics with cortistatin A, and STAT1 phosphorylation assays","pmids":["31495563"],"confidence":"High","gaps":["Molecular basis of the scaffolding function not defined","Scaffold-dependent gene set not mechanistically mapped to interactors"]},{"year":2019,"claim":"Linked CDK8/CDK19 kinase activity to immune cell fate by showing inhibition sensitizes TGF-β/SMAD signaling and attenuates IFN-γ–STAT1, promoting Treg differentiation.","evidence":"Small-molecule inhibitors, phospho-SMAD2/3 and phospho-STAT1 immunoblot, flow cytometry, and an EAE mouse model","pmids":["31552016"],"confidence":"Medium","gaps":["Inhibitors do not separate CDK8 from CDK19","Direct vs indirect effect on SMAD phosphorylation unresolved"]},{"year":2022,"claim":"Identified SWI/SNF chromatin remodeler components as CDK8/CDK19 phosphorylation targets controlling enhancer co-occupancy and intestinal lineage specification.","evidence":"Mouse genetic models, CDK8/19 inhibitors, phosphorylation assays, and ChIP-seq for MED12/SWI/SNF colocalization","pmids":["36006697"],"confidence":"High","gaps":["CDK8 and CDK19 act redundantly; CDK19-specific phosphosites not isolated","Phosphosite-to-function causality not fully established"]},{"year":2022,"claim":"Revealed a CDK19-p53 physical interaction that restrains p21 transcription and supports hematopoietic stem cell self-renewal.","evidence":"CDK19 knockout mice, reciprocal co-immunoprecipitation, CDK8/19 inhibitor, and p53-inhibitor rescue","pmids":["35110726"],"confidence":"Medium","gaps":["Whether the p53 interaction is kinase-dependent unclear","Structural basis of CDK19-p53 binding undefined"]},{"year":2023,"claim":"Argued that CDK8 and CDK19 are functionally interchangeable, with knockout differences reflecting expression/activity dosage, and that both stabilize cyclin C kinase-independently.","evidence":"Multi-omics with genetic knockouts, selective inhibitors, a CDK8/19 PROTAC degrader, and kinase-inactive mutants","pmids":["37378433"],"confidence":"High","gaps":["Reconciliation with context-specific non-redundancy reported elsewhere not fully settled","Mechanism of kinase-independent cyclin C protection not defined"]},{"year":2024,"claim":"Uncovered a non-transcriptional, cytoplasmic function in which the CDK19/Cdk8 ortholog phosphorylates Drp1(Ser616) to promote mitochondrial fission and counter Pink1-deficiency phenotypes.","evidence":"Drosophila genetics, endogenous GFP-tagged localization, Drp1 phosphorylation assays, Pink1 epistasis, ROS and morphology analysis","pmids":["38637532"],"confidence":"High","gaps":["Cytoplasmic Drp1 phosphorylation shown mainly via the Drosophila ortholog; human CDK19 direct phosphorylation of Drp1 not biochemically isolated","Regulation switching nuclear vs cytoplasmic localization unknown"]},{"year":2025,"claim":"Extended the STAT-kinase axis to STAT5/STAT3 in immune effector and fibrotic contexts, linking CDK8/CDK19 activity to ILC2 activation, T-cell fate, and disease models.","evidence":"Selective inhibitors (AS3334366, AS2863619), phospho-STAT5/STAT3 assays, ILC2-deficient and ITP/asthma mouse models","pmids":["40795210","41770851"],"confidence":"Medium","gaps":["Inhibitors do not separate CDK8 from CDK19","Direct CDK19-STAT5/STAT3 phosphorylation vs indirect effects not fully resolved"]},{"year":2025,"claim":"Placed CDK19 in a GRHL2-driven aging axis where CDK19 sequesters p53 to suppress p21 and senescence in prostate tissue.","evidence":"Single-nucleus transcriptomics, co-immunoprecipitation, CDK19 gain/loss, and primate gene therapy","pmids":["41266629"],"confidence":"Medium","gaps":["Whether p53 sequestration requires CDK19 kinase activity unclear","Generalizability beyond prostate not established"]},{"year":2025,"claim":"Showed CDK19 expression is post-transcriptionally tuned by NUDT21-directed alternative polyadenylation, with long-3'UTR isoforms enhancing translation to drive cholesterol biosynthesis and immune evasion.","evidence":"CRISPR screening, APA analysis, RNA export and polysome profiling, 3'UTR truncation, and overexpression rescue","pmids":["41255211"],"confidence":"Medium","gaps":["Connection between CDK19 protein level and cholesterol pathway is correlative downstream","Single cancer context (colorectal)"]},{"year":2026,"claim":"Implicated CDK8/CDK19 in hepatitis delta virus replication via Pol II CTD phosphorylation and small HDAg methylation-dependent rescue.","evidence":"Selective inhibitor MSC2530818, genetic knockouts, HDV replication assays, and Pol II CTD phosphorylation readouts","pmids":["41665877"],"confidence":"Medium","gaps":["CDK19-specific contribution not separated from CDK8","Direct CTD phosphorylation by CDK19 not isolated"]},{"year":null,"claim":"How CDK19 is selectively partitioned between nuclear transcriptional, kinase-independent scaffolding, and cytoplasmic mitochondrial-fission functions, and which of its many reported substrate engagements are direct, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of CDK19 substrate selection","Determinants of subcellular localization unknown","Most studies cannot pharmacologically or genetically separate CDK19 from CDK8"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,5,11,14]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,10,11]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,4,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,7,14,16]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,9,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,13,14,16]}],"complexes":["Mediator kinase module","Mediator complex"],"partners":["CDK8","CCNC","MED12","MED13","TP53"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BWU1","full_name":"Cyclin-dependent kinase 19","aliases":["CDC2-related protein kinase 6","Cell division cycle 2-like protein kinase 6","Cell division protein kinase 19","Cyclin-dependent kinase 11","Death-preventing kinase"],"length_aa":502,"mass_kda":56.8,"function":"","subcellular_location":"Cytoplasm; Cytoplasm, perinuclear region; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9BWU1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDK19","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"MED19","stoichiometry":10.0},{"gene":"MED14","stoichiometry":4.0},{"gene":"MED11","stoichiometry":0.2},{"gene":"MED21","stoichiometry":0.2},{"gene":"MED28","stoichiometry":0.2},{"gene":"MED31","stoichiometry":0.2},{"gene":"MED4","stoichiometry":0.2},{"gene":"MED9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CDK19","total_profiled":1310},"omim":[{"mim_id":"618916","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 87; DEE87","url":"https://www.omim.org/entry/618916"},{"mim_id":"614720","title":"CYCLIN-DEPENDENT KINASE 19; CDK19","url":"https://www.omim.org/entry/614720"},{"mim_id":"603184","title":"CYCLIN-DEPENDENT KINASE 8; CDK8","url":"https://www.omim.org/entry/603184"},{"mim_id":"308350","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 1; DEE1","url":"https://www.omim.org/entry/308350"},{"mim_id":"152950","title":"MICROCEPHALY WITH OR WITHOUT CHORIORETINOPATHY, LYMPHEDEMA, OR IMPAIRED INTELLECTUAL DEVELOPMENT; MCLMR","url":"https://www.omim.org/entry/152950"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CDK19"},"hgnc":{"alias_symbol":["KIAA1028","bA346C16.3"],"prev_symbol":["CDK11","CDC2L6"]},"alphafold":{"accession":"Q9BWU1","domains":[{"cath_id":"3.30.200.20","chopping":"11-97","consensus_level":"high","plddt":92.1605,"start":11,"end":97},{"cath_id":"1.10.510.10","chopping":"102-334","consensus_level":"high","plddt":89.8824,"start":102,"end":334}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BWU1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BWU1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BWU1-F1-predicted_aligned_error_v6.png","plddt_mean":76.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDK19","jax_strain_url":"https://www.jax.org/strain/search?query=CDK19"},"sequence":{"accession":"Q9BWU1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BWU1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BWU1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BWU1"}},"corpus_meta":[{"pmid":"26502155","id":"PMC_26502155","title":"A 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the NOD Mouse Model.","date":"2021","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/33664748","citation_count":1,"is_preprint":false},{"pmid":"31665012","id":"PMC_31665012","title":"Correction to: Transcriptional activation of CBFβ by CDK11p110 is necessary to promote osteosarcoma cell proliferation.","date":"2019","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/31665012","citation_count":1,"is_preprint":false},{"pmid":"41123539","id":"PMC_41123539","title":"Transcriptional cyclin-dependent kinases Cdk8 and Cdk19 are required for normal macrophage differentiation.","date":"2025","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/41123539","citation_count":0,"is_preprint":false},{"pmid":"41377501","id":"PMC_41377501","title":"CDK11 activates CDK12 to trigger the elongation of RNA Polymerase II.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41377501","citation_count":0,"is_preprint":false},{"pmid":"41886307","id":"PMC_41886307","title":"In Silico-Enabled Discovery and Development of Potent and Selective CDK11 Inhibitors.","date":"2026","source":"ChemMedChem","url":"https://pubmed.ncbi.nlm.nih.gov/41886307","citation_count":0,"is_preprint":false},{"pmid":"41904131","id":"PMC_41904131","title":"Phosphorylation of SF3B1 by CDK11 orchestrates spliceosome activation via SNIP1-dependent RES complex recruitment.","date":"2026","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/41904131","citation_count":0,"is_preprint":false},{"pmid":"33921436","id":"PMC_33921436","title":"Stability of Imprinting and Differentiation Capacity in Naïve Human Cells Induced by Chemical Inhibition of CDK8 and CDK19.","date":"2021","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/33921436","citation_count":0,"is_preprint":false},{"pmid":"40077993","id":"PMC_40077993","title":"Synthesis and Imaging of Novel CDK19-Targeted Tracers Incorporating an Albumin-Binding Moiety.","date":"2025","source":"Journal of labelled compounds & radiopharmaceuticals","url":"https://pubmed.ncbi.nlm.nih.gov/40077993","citation_count":0,"is_preprint":false},{"pmid":"41595181","id":"PMC_41595181","title":"Targeting CDK11 in Rhabdoid Tumor of the Kidney.","date":"2026","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/41595181","citation_count":0,"is_preprint":false},{"pmid":"42034640","id":"PMC_42034640","title":"Cryo-EM structures of the CDK11-cyclin L-SAP30BP complex reveal mechanisms of CDK11 regulation.","date":"2026","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/42034640","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48366,"output_tokens":5505,"usd":0.113836,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14008,"output_tokens":4476,"usd":0.09097,"stage2_stop_reason":"end_turn"},"total_usd":0.204806,"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\": 2019,\n      \"finding\": \"CDK8 and CDK19 have mechanistically distinct roles in IFN-γ transcriptional responses: CDK8 kinase activity promotes RNA polymerase II pause release and phosphorylates STAT1 at Ser727, whereas CDK19 regulates IFN-γ-responsive genes through a kinase-independent scaffolding function.\",\n      \"method\": \"GRO-seq, PRO-seq, chemical genetics (cortistatin A), transcriptomics, STAT1 phosphorylation assays; decoupling of CDK8 vs CDK19 functions\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (GRO-seq, PRO-seq, chemical genetics, phosphoproteomics) in a single rigorous study; enzymatic vs scaffolding roles directly demonstrated\",\n      \"pmids\": [\"31495563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDK8 and CDK19 function within a 4-protein Mediator kinase module (with CCNC, MED12, MED13); CCNC and MED12 activate CDK8/CDK19 kinase function, and MED13 enables their association with the Mediator complex. They affect RNA Pol II transcription indirectly by phosphorylating transcription factors and controlling Mediator structure.\",\n      \"method\": \"Biochemical characterization, review of genetic and biochemical studies; complex composition established by prior co-purification and functional assays\",\n      \"journal\": \"Transcription\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — extensively replicated across multiple labs; complex composition and activation mechanism established by multiple orthogonal studies cited within this review\",\n      \"pmids\": [\"30585107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCT251545 is a potent and selective inhibitor of CDK8 and CDK19 with >100-fold selectivity over 291 other kinases. X-ray crystallography shows a type 1 binding mode involving insertion of the CDK8 C-terminus into the ligand binding site. CDK8/CDK19 inhibition alters WNT pathway gene expression and phosphorylation of STAT1(Ser727), established as a biomarker of CDK8/CDK19 kinase activity in vitro and in vivo.\",\n      \"method\": \"X-ray crystallography, kinase selectivity profiling (291 kinases), cell-based gene expression assays, in vivo WNT tumor model\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus broad kinase selectivity profiling plus in vivo validation; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"26502155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CDK19 (referred to as hCDK11 in this study, the Mediator-associated paralog of CDK8) independently forms Mediator complexes devoid of CDK8. siRNA knockdown showed that CDK8 and CDK19 have opposing functions in VP16-dependent transcriptional regulation.\",\n      \"method\": \"Epitope-tagged CDK19 purification from HeLa cells, co-purification of Mediator complex, siRNA knockdown, luciferase transcription assay\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-purification plus functional siRNA knockdown; single lab but two orthogonal methods\",\n      \"pmids\": [\"18651850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CDK8 and CDK19 have qualitatively the same effects on protein phosphorylation and gene expression; differential effects of CDK8 vs CDK19 knockouts are attributable to quantitative differences in expression and activity rather than different functions. Both CDK8 and CDK19 protect their binding partner cyclin C from proteolytic degradation in a kinase-independent manner.\",\n      \"method\": \"Transcriptomics, proteomics, phosphoproteomics; CDK8/CDK19 genetic knockouts, selective small-molecule inhibitors, CDK8/19 PROTAC degrader, isogenic cell populations expressing kinase-inactive mutants\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — comprehensive multi-omics with genetic and pharmacological tools, kinase-dead mutants, PROTAC degradation; multiple orthogonal methods in single study\",\n      \"pmids\": [\"37378433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK8 and CDK19 function redundantly to regulate intestinal lineage specification. The Mediator kinase module binds and phosphorylates key components of the SWI/SNF chromatin remodeling complex in intestinal epithelial cells; SWI/SNF and MED12-Mediator colocalize at lineage-specifying enhancers in a CDK8/19-dependent manner.\",\n      \"method\": \"Genetically defined mouse models, pharmacological CDK8/19 inhibitors, phosphorylation assays of SWI/SNF components, ChIP-seq for MED12 and SWI/SNF colocalization\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic models plus biochemical phosphorylation assays plus ChIP-seq; multiple orthogonal methods with in vivo validation\",\n      \"pmids\": [\"36006697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Inhibition of CDK8/CDK19 kinase activity promotes Treg cell differentiation via sensitized TGF-β signaling, associated with attenuation of IFN-γ–STAT1 signaling and enhancement of phosphorylated SMAD2/3.\",\n      \"method\": \"Small-molecule CDK8/19 inhibitors (CCT251921, Senexin A), flow cytometry for Treg differentiation, phospho-SMAD2/3 and phospho-STAT1 immunoblot, EAE mouse model\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition plus in vivo mouse model plus phosphorylation readouts; single lab, two orthogonal approaches\",\n      \"pmids\": [\"31552016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDK8 and CDK19 (Mediator kinases) are required for BMP4-induced EMT; both genetic and pharmacological inhibition of CDK8/CDK19 abrogates BMP-induced EMT, YAP nuclear localization, and tumor cell invasion. CDK8/CDK19 mediate SMAD1-driven EMT in a YAP1-dependent manner.\",\n      \"method\": \"siRNA/shRNA knockdown, CDK8/19 selective inhibitor treatment, in vitro invasion assays, in vivo syngeneic EMT model, RNA-seq\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological inhibition combined with in vivo model; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"29780169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK19 interacts with p53 and inhibits p53-mediated transcription of p21 in hematopoietic stem cells (HSCs). CDK19 knockout mice show activated p53 signaling and impaired HSC proliferation/self-renewal; a specific p53 inhibitor partially rescues CDK19-null HSC defects.\",\n      \"method\": \"CDK19 knockout mice, co-immunoprecipitation (CDK19-p53 interaction), CDK8/19 inhibitor SenexinB, p53 inhibitor rescue experiments, flow cytometry\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP for interaction, genetic KO with defined phenotype, epistasis rescue; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"35110726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CDK19 de novo missense variants (Tyr32His, Thr31Asn, Thr196Ala) cause a syndromic neurodevelopmental disorder. In Drosophila, human CDK19 fully rescues loss of the CDK19 ortholog Cdk8 (larval lethality, seizures, reduced lifespan, loss of NMJ boutons), while disease-associated CDK19 variants fail to rescue and behave as loss-of-function alleles.\",\n      \"method\": \"Drosophila genetic complementation, neuronal RNAi knockdown of Cdk8, rescue with human CDK19 WT vs. variant cDNA, neuromuscular junction morphology analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic complementation with WT and disease variant constructs; multiple phenotypic readouts in a rigorous model organism study\",\n      \"pmids\": [\"32330417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Disease-associated CDK19 variants show altered kinase activity: the Gly28Arg substitution reduces kinase activity and the Tyr32His substitution increases kinase activity compared to wild-type, as measured by in vitro autophosphorylation and substrate phosphorylation assays. Both variants cause morphological abnormalities in zebrafish.\",\n      \"method\": \"In vitro autophosphorylation and substrate phosphorylation assays, zebrafish mRNA injection morphology assay\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro kinase assays for both LoF and GoF variants, supported by in vivo zebrafish model; single lab but two orthogonal methods\",\n      \"pmids\": [\"33495529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Drosophila Cdk8 (the ortholog of human CDK8 and CDK19) promotes mitochondrial fission through phosphorylation of Drp1 at Ser616. Human CDK19 can rescue neuronal Cdk8 loss (reduced lifespan, bang sensitivity), including cytoplasmic localization in neurons. Cdk8/CDK19 overexpression suppresses Pink1-deficiency phenotypes (elevated ROS, mitochondrial dysmorphology).\",\n      \"method\": \"Drosophila genetic models, endogenous GFP-tagged Cdk8 localization, Drp1 phosphorylation assays, Pink1 epistasis, ROS measurement, mitochondrial morphology analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic models with epistasis, direct phosphorylation assay, subcellular localization; multiple orthogonal methods with in vivo validation\",\n      \"pmids\": [\"38637532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK8 and CDK19 act redundantly to regulate CFTR pathway gene expression in intestinal epithelium. Combined deletion of CDK8 and CDK19 in intestinal organoids leads to mucus accumulation, increased goblet cell secretion, and downregulation of CFTR expression and function, while individual deletions show limited effects.\",\n      \"method\": \"Mouse genetic models (CDK8 KO, CDK19 KO, double KO), intestinal organoids, pharmacological CDK8/19 inhibition, CFTR functional assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-KO models with functional readouts in vivo and in vitro; pharmacological corroboration; multiple orthogonal methods\",\n      \"pmids\": [\"36545778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDK8 and CDK19 are required for normal macrophage differentiation; double knockout (DKO) mice lacking both Cdk8 and Cdk19 in hematopoietic cells show expansion of splenic macrophages, altered cytokine secretion, deregulated gene expression, precocious cell cycle exit, and impaired Fc-mediated phagocytosis in bone marrow-derived macrophages.\",\n      \"method\": \"Hematopoietic-specific CDK8/CDK19 double knockout mice, gene expression analysis, phagocytosis assays, flow cytometry, cytokine secretion assays\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic DKO with defined cellular phenotypes; single lab, multiple readouts\",\n      \"pmids\": [\"41123539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDK8 and CDK19 phosphorylate serine residues of STAT5 in ILC2s, promoting their activation and cytokine production (IL-5, IL-13). CDK8/19 inhibition suppresses STAT5 serine phosphorylation and ILC2 activation, reducing lung fibrosis in an OVA-induced asthmatic mouse model.\",\n      \"method\": \"CDK8/19 inhibitor AS3334366, OVA-induced asthmatic mouse model, ILC2-deficient mouse model, phospho-STAT5 (serine) assays, cytokine production measurements\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition plus genetic ILC2-deficient model plus phosphorylation assays; single lab, in vivo corroboration\",\n      \"pmids\": [\"40795210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK19 inhibition (siRNA knockdown and CDK8/19 inhibitor) significantly decreases migration and invasion of prostate cancer cell lines.\",\n      \"method\": \"siRNA-mediated CDK19 knockdown, selective CDK8/19 inhibitor treatment, migration and invasion assays, RNAseq\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological inhibition with functional readouts; single lab, two orthogonal approaches\",\n      \"pmids\": [\"27678455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDK8/CDK19 inhibition with AS2863619 promotes conversion of CD4+CD25- effector T cells into Foxp3+ Tregs via STAT5 phosphorylation; STAT5 blockade abrogates this effect. CDK8/CDK19 inhibition also suppresses STAT3 phosphorylation under IL-6 conditions, attenuating Th17 polarization. These mechanisms were confirmed in a murine ITP model.\",\n      \"method\": \"Small-molecule CDK8/19 inhibitor AS2863619, flow cytometry, STAT5/STAT3 phosphorylation assays, transcriptomics, metabolic analysis, murine ITP model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with mechanistic phosphorylation readouts and in vivo model; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41770851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In prostate aging, GRHL2 promotes CDK19 transcription; CDK19 sequesters p53, suppressing p21Waf1/Cip1 expression. Aging-related downregulation of GRHL2 releases p53 from the CDK19-p53 complex, activating p21 transcription and inducing cell senescence. A GRHL2-based gene therapy delayed prostate aging in vivo.\",\n      \"method\": \"Single-nucleus transcriptomics, co-immunoprecipitation (CDK19-p53 complex), CDK19 overexpression/knockdown, in vivo gene therapy in primates\",\n      \"journal\": \"Nature aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for CDK19-p53 interaction plus genetic manipulation plus in vivo gene therapy; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41266629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NUDT21 promotes generation of CDK19 mRNA isoforms with long 3'UTR by directing distal polyadenylation sites; the long 3'UTR facilitates cytoplasmic export and efficient translation of CDK19 transcripts (without affecting stability), thereby driving cholesterol biosynthesis and immune evasion in colorectal cancer.\",\n      \"method\": \"CRISPR/Cas9 screening, APA analysis, RNA export assays, polysome profiling, CDK19 3'UTR truncation, CDK19 overexpression rescue\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR screen plus mechanistic follow-up with APA, RNA export, and translation assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41255211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CDK8 and CDK19 are required for hepatitis delta virus (HDV) replication; their loss prevents establishment of HDV replication in cell culture models and reduces HDV RNA synthesis. CDK8/19 inactivation reduces phosphorylation of the C-terminal domain of Pol II. Ectopic expression of small HDAg (but not its methylation site R13 mutant) restores HDV replication in CDK8/19-deficient cells.\",\n      \"method\": \"Selective CDK8/19 inhibitor MSC2530818, CDK8/19 genetic knockouts, HDV replication assays in multiple cell culture models, Pol II CTD phosphorylation assays\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic CDK8/19 inhibition with mechanistic Pol II phosphorylation readout; single lab, two orthogonal approaches\",\n      \"pmids\": [\"41665877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CDK19 haploinsufficiency (caused by chromosomal inversion disrupting the CDK19 gene) is associated with microcephaly, congenital retinal folds, and mental retardation. CDK19 is expressed in fetal eye and fetal brain. Drosophila cdk8 (the ortholog) knockdown in multiple dendrite neurons reduced dendritic branching by 35% and altered dendritic arbour morphology.\",\n      \"method\": \"Karyotyping, FISH mapping of chromosomal breakpoints, quantitative RT-PCR (50% transcript reduction in patient cells), Drosophila conditional cdk8 knockdown in md neurons\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chromosomal disruption mapped to CDK19, qPCR confirms haploinsufficiency, Drosophila functional experiments confirm neuronal role; single lab but multiple methods\",\n      \"pmids\": [\"20563892\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDK19 is a cyclin-dependent kinase that, together with its paralog CDK8 and the proteins CCNC, MED12, and MED13, forms the Mediator kinase module; CDK19 phosphorylates transcription factors (including STAT1, STAT5, SMAD2/3) and SWI/SNF complex components to regulate signal-responsive gene expression, exerts a kinase-independent scaffolding role to control distinct gene sets (e.g., in IFN-γ responses), protects cyclin C from proteolytic degradation, interacts with p53 to suppress p21-mediated senescence, and—unexpectedly—functions in the cytoplasm to phosphorylate Drp1 at Ser616 and promote mitochondrial fission, while disease-associated CDK19 variants that alter its kinase activity cause neurodevelopmental disorders with epileptic encephalopathy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDK19 is a cyclin-dependent kinase that, with its paralog CDK8, constitutes the catalytic core of the Mediator kinase module, a four-protein assembly with CCNC, MED12, and MED13 in which CCNC and MED12 activate kinase function and MED13 tethers the module to Mediator to regulate RNA Pol II transcription indirectly [#1]. CDK19 assembles into Mediator complexes distinct from those containing CDK8 [#3], and across phosphoproteomic and genetic analyses CDK8 and CDK19 produce qualitatively equivalent effects on phosphorylation and gene expression, with apparent differences reflecting quantitative expression and activity rather than divergent functions; both also protect their partner cyclin C from proteolytic degradation in a kinase-independent manner [#4]. Beyond canonical transcriptional control, CDK19 governs signal-responsive programs by phosphorylating transcription factors and chromatin machinery — STAT1(Ser727) as a readout of kinase activity [#2], STAT5 serine residues to drive ILC2 activation [#14], STAT5/STAT3 in T-cell fate decisions [#16], and SWI/SNF components at lineage-specifying enhancers [#5] — and it also acts through a kinase-independent scaffolding mode to regulate a distinct set of IFN-\\u03b3-responsive genes [#0]. CDK19 additionally interacts physically with p53 to suppress p21-mediated senescence [#8, #17] and, unexpectedly, localizes to the cytoplasm in neurons where the ortholog phosphorylates Drp1 at Ser616 to promote mitochondrial fission [#11]. De novo missense variants that alter CDK19 kinase activity cause a syndromic neurodevelopmental disorder with epileptic features, behaving as loss- or gain-of-function alleles in model organisms [#9, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that CDK19 is a bona fide Mediator-associated kinase that assembles into Mediator complexes independent of its paralog CDK8 and exerts distinct transcriptional effects.\",\n      \"evidence\": \"Epitope-tagged CDK19 purification, Mediator co-purification, siRNA knockdown, and luciferase reporter assays in HeLa cells\",\n      \"pmids\": [\"18651850\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve whether opposing CDK8/CDK19 effects reflect intrinsic functional divergence or quantitative differences\", \"Single lab; substrate specificity not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined a selective chemical probe and structural binding mode for CDK8/CDK19 and validated STAT1(Ser727) as a pharmacodynamic biomarker of their kinase activity.\",\n      \"evidence\": \"X-ray crystallography, kinase selectivity profiling across 291 kinases, cell-based gene expression, and an in vivo WNT tumor model\",\n      \"pmids\": [\"26502155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CCT251545 does not discriminate CDK8 from CDK19\", \"Direct CDK19 substrate repertoire not enumerated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Consolidated the Mediator kinase module architecture, showing CCNC/MED12 activate the kinases and MED13 couples them to Mediator, defining how CDK19 influences Pol II transcription indirectly.\",\n      \"evidence\": \"Biochemical characterization and synthesis of co-purification and functional studies\",\n      \"pmids\": [\"30585107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Review-level synthesis; does not isolate CDK19-specific contributions within the module\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Distinguished CDK19's kinase-independent scaffolding role from CDK8's enzymatic role in IFN-\\u03b3 transcription, revealing functional non-equivalence at specific gene sets.\",\n      \"evidence\": \"GRO-seq, PRO-seq, chemical genetics with cortistatin A, and STAT1 phosphorylation assays\",\n      \"pmids\": [\"31495563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the scaffolding function not defined\", \"Scaffold-dependent gene set not mechanistically mapped to interactors\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked CDK8/CDK19 kinase activity to immune cell fate by showing inhibition sensitizes TGF-\\u03b2/SMAD signaling and attenuates IFN-\\u03b3\\u2013STAT1, promoting Treg differentiation.\",\n      \"evidence\": \"Small-molecule inhibitors, phospho-SMAD2/3 and phospho-STAT1 immunoblot, flow cytometry, and an EAE mouse model\",\n      \"pmids\": [\"31552016\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Inhibitors do not separate CDK8 from CDK19\", \"Direct vs indirect effect on SMAD phosphorylation unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified SWI/SNF chromatin remodeler components as CDK8/CDK19 phosphorylation targets controlling enhancer co-occupancy and intestinal lineage specification.\",\n      \"evidence\": \"Mouse genetic models, CDK8/19 inhibitors, phosphorylation assays, and ChIP-seq for MED12/SWI/SNF colocalization\",\n      \"pmids\": [\"36006697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CDK8 and CDK19 act redundantly; CDK19-specific phosphosites not isolated\", \"Phosphosite-to-function causality not fully established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a CDK19-p53 physical interaction that restrains p21 transcription and supports hematopoietic stem cell self-renewal.\",\n      \"evidence\": \"CDK19 knockout mice, reciprocal co-immunoprecipitation, CDK8/19 inhibitor, and p53-inhibitor rescue\",\n      \"pmids\": [\"35110726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the p53 interaction is kinase-dependent unclear\", \"Structural basis of CDK19-p53 binding undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Argued that CDK8 and CDK19 are functionally interchangeable, with knockout differences reflecting expression/activity dosage, and that both stabilize cyclin C kinase-independently.\",\n      \"evidence\": \"Multi-omics with genetic knockouts, selective inhibitors, a CDK8/19 PROTAC degrader, and kinase-inactive mutants\",\n      \"pmids\": [\"37378433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with context-specific non-redundancy reported elsewhere not fully settled\", \"Mechanism of kinase-independent cyclin C protection not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Uncovered a non-transcriptional, cytoplasmic function in which the CDK19/Cdk8 ortholog phosphorylates Drp1(Ser616) to promote mitochondrial fission and counter Pink1-deficiency phenotypes.\",\n      \"evidence\": \"Drosophila genetics, endogenous GFP-tagged localization, Drp1 phosphorylation assays, Pink1 epistasis, ROS and morphology analysis\",\n      \"pmids\": [\"38637532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cytoplasmic Drp1 phosphorylation shown mainly via the Drosophila ortholog; human CDK19 direct phosphorylation of Drp1 not biochemically isolated\", \"Regulation switching nuclear vs cytoplasmic localization unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the STAT-kinase axis to STAT5/STAT3 in immune effector and fibrotic contexts, linking CDK8/CDK19 activity to ILC2 activation, T-cell fate, and disease models.\",\n      \"evidence\": \"Selective inhibitors (AS3334366, AS2863619), phospho-STAT5/STAT3 assays, ILC2-deficient and ITP/asthma mouse models\",\n      \"pmids\": [\"40795210\", \"41770851\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Inhibitors do not separate CDK8 from CDK19\", \"Direct CDK19-STAT5/STAT3 phosphorylation vs indirect effects not fully resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed CDK19 in a GRHL2-driven aging axis where CDK19 sequesters p53 to suppress p21 and senescence in prostate tissue.\",\n      \"evidence\": \"Single-nucleus transcriptomics, co-immunoprecipitation, CDK19 gain/loss, and primate gene therapy\",\n      \"pmids\": [\"41266629\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether p53 sequestration requires CDK19 kinase activity unclear\", \"Generalizability beyond prostate not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed CDK19 expression is post-transcriptionally tuned by NUDT21-directed alternative polyadenylation, with long-3'UTR isoforms enhancing translation to drive cholesterol biosynthesis and immune evasion.\",\n      \"evidence\": \"CRISPR screening, APA analysis, RNA export and polysome profiling, 3'UTR truncation, and overexpression rescue\",\n      \"pmids\": [\"41255211\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Connection between CDK19 protein level and cholesterol pathway is correlative downstream\", \"Single cancer context (colorectal)\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Implicated CDK8/CDK19 in hepatitis delta virus replication via Pol II CTD phosphorylation and small HDAg methylation-dependent rescue.\",\n      \"evidence\": \"Selective inhibitor MSC2530818, genetic knockouts, HDV replication assays, and Pol II CTD phosphorylation readouts\",\n      \"pmids\": [\"41665877\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CDK19-specific contribution not separated from CDK8\", \"Direct CTD phosphorylation by CDK19 not isolated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CDK19 is selectively partitioned between nuclear transcriptional, kinase-independent scaffolding, and cytoplasmic mitochondrial-fission functions, and which of its many reported substrate engagements are direct, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of CDK19 substrate selection\", \"Determinants of subcellular localization unknown\", \"Most studies cannot pharmacologically or genetically separate CDK19 from CDK8\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 5, 11, 14]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 10, 11]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 7, 14, 16]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 9, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 13, 14, 16]}\n    ],\n    \"complexes\": [\"Mediator kinase module\", \"Mediator complex\"],\n    \"partners\": [\"CDK8\", \"CCNC\", \"MED12\", \"MED13\", \"TP53\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":5,"faith_total":5,"faith_pct":100.0}}