{"gene":"CAMK4","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2001,"finding":"CaMKIV is required for activity-induced CREB phosphorylation and c-Fos expression in forebrain neurons; dominant-negative CaMKIV in postnatal forebrain blocks late LTP (L-LTP) but not early LTP, demonstrating a specific role for nuclear CaMKIV signaling in long-term memory consolidation/retention.","method":"Transgenic mice expressing dominant-negative CaMKIV restricted to postnatal forebrain; hippocampal LTP recordings; behavioral memory tests","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean transgenic loss-of-function with multiple orthogonal readouts (LTP, CREB phosphorylation, behavior), replicated across multiple assays in one rigorous study","pmids":["11572782"],"is_preprint":false},{"year":2000,"finding":"CaMKIV (Camk4) phosphorylates protamine-2 in vitro; Camk4 knockout male mice are infertile due to impaired spermiogenesis, with specific loss of protamine-2 and prolonged retention of transition protein-2 in elongating spermatids, indicating a role for CaMKIV in the sequential exchange of basic nuclear proteins on chromatin during spermiogenesis.","method":"Targeted gene knockout in mice; in vitro kinase assay (CaMKIV phosphorylation of protamine-2); histological analysis of spermatids","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay demonstrating substrate phosphorylation combined with clean knockout phenotype with specific protein-level readout","pmids":["10932193"],"is_preprint":false},{"year":2005,"finding":"CaMKIV is required for SLE serum IgG (via anti-TCR/CD3 autoantibodies)-induced overexpression of CREM and its increased binding to the IL-2 promoter, thereby suppressing IL-2 production in T cells; dominant-inactive CaMKIV abolished this effect.","method":"Dominant-inactive CaMKIV expression in normal T cells; IL-2 promoter activity assay; CREM binding assay; nuclear localization of CaMKIV assessed by subcellular fractionation","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative approach with multiple transcriptional readouts (promoter activity, CREM binding, IL-2 production), single lab","pmids":["15841182"],"is_preprint":false},{"year":2014,"finding":"CaMK4 is required for Th17 cell differentiation; genetic or pharmacologic inhibition of CaMK4 reduces IL-17 production by decreasing activation of CREM-α and the AKT/mTOR pathway; CaMK4 levels increase selectively under Th17-inducing conditions but not Treg, Th1, or Th2 conditions.","method":"CaMK4 knockout mice; pharmacologic inhibition; naive T cell differentiation assays; IL17A/IL17F mRNA measurement; CaMK4 siRNA in human SLE T cells","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout, pharmacologic inhibition, and human cell siRNA knockdown with specific transcriptional and signaling readouts across multiple orthogonal approaches","pmids":["24667640"],"is_preprint":false},{"year":2005,"finding":"Acute in vivo expression of constitutively active CaMKIV or CREB enhances NMDA receptor-mediated synaptic responses and LTP, and generates electrophysiological and morphological features consistent with 'silent synapses' in rodent hippocampus.","method":"Viral-mediated gene transfer of constitutively active CaMKIV in vivo; electrophysiology; morphological analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — viral gain-of-function with multiple orthogonal readouts (electrophysiology + morphology) in vivo","pmids":["15748849"],"is_preprint":false},{"year":1999,"finding":"CaMKIV activation is necessary for the late phase of cerebellar LTD; dominant-inhibitory CaMKIV constructs attenuated the late phase of LTD in cultured Purkinje neurons, while inhibition of PKA or MAPK/RSK cascades had no effect.","method":"Particle-mediated transfection of dominant-inhibitory CaMKIV in cultured Purkinje neurons; LTD measurement by electrophysiology","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative approach with defined phenotypic readout, epistasis with other kinase pathways tested, single lab","pmids":["10433267"],"is_preprint":false},{"year":2012,"finding":"CaMKIV activates endothelial nitric oxide synthase (eNOS) in vitro; CaMK4 knockout mice display hypertension, cardiac hypertrophy, and vascular/kidney damage, establishing CaMKIV as a regulator of vascular tone through eNOS activation.","method":"CaMK4 knockout mouse cardiovascular phenotyping; in vitro kinase assay demonstrating CaMKIV-dependent eNOS activation","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout phenotype plus in vitro eNOS activation assay, single lab, two orthogonal approaches","pmids":["23130158"],"is_preprint":false},{"year":2018,"finding":"CaMK4 modulates podocyte motility by altering expression of GTPases Rac1 and RhoA; CaMK4 phosphorylates scaffold protein 14-3-3β, releasing and destabilizing synaptopodin; CaMK4 suppresses nephrin, synaptopodin, and actin fiber expression in podocytes.","method":"CaMK4 overexpression/inhibition in podocytes; in vivo and in vitro assays of podocyte motility; phosphorylation of 14-3-3β shown by biochemical assay; targeted delivery of CaMK4 inhibitor to podocytes in lupus-prone mice","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal mechanisms identified (Rac1/RhoA regulation, 14-3-3β phosphorylation, synaptopodin degradation) with in vitro and in vivo validation, single lab","pmids":["29985166"],"is_preprint":false},{"year":2015,"finding":"CaMKK2 signals through CaMKIV to control liver cancer cell growth; CaMKK2 acts as a scaffold assembling CaMKIV with mTOR/S6K pathway components to stimulate protein synthesis; ectopic expression of wild-type but not kinase-inactive CaMKK2 rescues growth defects from CaMKK2 loss.","method":"RNAi ablation of CaMKK2; ectopic expression of wild-type vs. kinase-inactive CaMKK2; CaMKIV-dependent signaling assays; in vivo tumorigenicity assays","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis with kinase-inactive rescue and in vivo validation, but CaMKIV role inferred partly from pathway data without CaMKIV-specific reconstitution, single lab","pmids":["25847065"],"is_preprint":false},{"year":2009,"finding":"CaMKK2 and CaMKIV are required for BDNF-dependent cerebellar granule cell migration; loss of either kinase reduces CREB phosphorylation, BDNF mRNA (exons I and IV), and BDNF protein; reexpression of CaMKK2 or CaMKIV in null granule cells restores pCREB and BDNF; exogenous BDNF rescues migration in vitro.","method":"CaMKK2 and CaMKIV null mice; in vitro and in vivo granule cell migration assays; reexpression rescue experiments; CREB phosphorylation and BDNF measurement","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with rescue experiments and multiple orthogonal readouts (migration, pCREB, BDNF protein), single lab but rigorous","pmids":["19605628"],"is_preprint":false},{"year":2005,"finding":"Importin-α transports CaMKIV into the nucleus independently of importin-β; CaMKIV directly interacts with the C-terminal region of importin-α; the CaMKIV/importin-α complex does not form a ternary complex with importin-β; microinjection of importin-α-ΔIBB enhances nuclear translocation of CaMKIV in vivo.","method":"Digitonin-permeabilized cell nuclear import assay; direct binding assay (importin-α C-terminus pulldown); cytoplasmic microinjection of importin-α-ΔIBB; fluorescence microscopy","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution of nuclear import, direct binding assay, and in vivo microinjection with multiple orthogonal methods in one study","pmids":["15719015"],"is_preprint":false},{"year":2017,"finding":"CaMKIV jointly regulates excitatory synaptic scaling and intrinsic excitability in neocortical pyramidal neurons through a cell-autonomous bidirectional mechanism; dominant-negative and constitutively active nuclear CaMKIV manipulations shift spontaneous firing rates, but inhibitory synaptic scaling is unaffected by these manipulations.","method":"Dominant-negative and constitutively active nuclear CaMKIV expression in individual neocortical neurons; electrophysiological measurement of excitatory quantal amplitude, intrinsic excitability, and inhibitory quantal amplitude","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional genetic manipulation (dnCaMKIV and caCaMKIV) with multiple orthogonal electrophysiological readouts, cell-autonomous design","pmids":["28592691"],"is_preprint":false},{"year":2007,"finding":"CaMKII and CaMKIV act additively and in parallel to promote neuronal survival in spiral ganglion neurons; CaMKIV requires CREB to promote survival (consistent with its exclusive nuclear localization), whereas CaMKII promotes survival via functional inactivation of Bad, independent of CREB.","method":"Expression of dominant-inhibitory CaMKIV and GFP-AIP (CaMKII inhibitor) in neonatal rat spiral ganglion neurons; constitutively active CaMKII and CREB constructs; survival assays","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with dominant-negative and constitutively active constructs, two kinases dissected in parallel, single lab","pmids":["17651987"],"is_preprint":false},{"year":2001,"finding":"CaMKIV promotes neuronal survival; a dominant-active CaMKIV mutant inhibits apoptosis in cerebellar granule neurons under low-K+ conditions, while dominant-negative CaMKIV induces apoptosis under high-K+ conditions; caspase-3 cleaves CaMKIV during apoptosis, providing a feedback mechanism.","method":"Overexpression of dominant-active and dominant-negative CaMKIV mutants by gene transfer in cerebellar neurons; caspase-3 activity assay; CREB phosphorylation measurement","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional genetic manipulation with defined apoptotic phenotype and caspase-3 cleavage demonstrated, single lab","pmids":["11149901"],"is_preprint":false},{"year":2007,"finding":"CaMKIV specifically phosphorylates and activates OGT (O-GlcNAc transferase) both in vivo and in vitro under depolarization conditions; CaMKIV-dependent OGT activation is required for AP-1 activation and TIMP-1 gene expression in neuronal cells.","method":"In vivo and in vitro kinase assay (CaMKIV phosphorylation of OGT); CaMK inhibitor experiments; AP-1 reporter assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay demonstrating substrate phosphorylation plus in vivo corroboration with inhibitor, single lab","pmids":["18029144"],"is_preprint":false},{"year":2008,"finding":"CaMKIV is necessary for BDNF-induced phosphorylation of CREB and for overcoming MAG-mediated inhibition of axonal growth; pharmacologic inhibition or dominant-negative CaMKIV blocks the neurotrophin effect; calcium flux from intracellular stores is required for this CaMKIV signaling.","method":"Pharmacologic CaMKIV inhibition; dominant-negative CaMKIV overexpression; neurite outgrowth assay on MAG substrate; CREB phosphorylation measurement","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacologic and genetic inhibition with functional axon growth readout, single lab, two orthogonal inhibition approaches","pmids":["18381242"],"is_preprint":false},{"year":2012,"finding":"CaMK4 promotes osteoclast differentiation by directly interacting with and phosphorylating the Notch1 intracellular domain (Notch1-IC), which decreases Fbw7-dependent proteasomal degradation and increases Notch1-IC stability; kinase activity of CaMKIV is essential for this effect.","method":"Co-IP (direct interaction between CaMKIV and Notch1-IC); in vitro kinase assay; phosphorylation-deficient Notch1-IC mutant; ubiquitin-proteasome assay; osteoclast differentiation assay","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding (Co-IP), in vitro phosphorylation, mutagenesis of phosphorylation site, and functional differentiation readout in one study","pmids":["23103515"],"is_preprint":false},{"year":2020,"finding":"CaMKIV mediates an adaptive slowing of oxidative respiration during sepsis; CaMKIV directly phosphorylates DRP1 at Ser616 to promote mitochondrial fission, reduces expression of fusion proteins Mfn1/2 and OPA-1, and acts as a direct PINK1 kinase to enable mitophagy.","method":"CaMK4 knockout mice subjected to CLP sepsis; in vitro phosphorylation assay (DRP1 Ser616); mitochondrial respiration measurement; immunoblotting for fission/fusion proteins and PINK1/Parkin","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — direct phosphorylation assay for DRP1 combined with in vivo knockout, but PINK1 kinase relationship stated as direct without full reconstitution detail in abstract","pmids":["32932146"],"is_preprint":false},{"year":2014,"finding":"CaMKIV, through inhibitory serine phosphorylation of GSK-3β and inhibition of FBXW7 recruitment, prevents ubiquitin-proteasomal degradation of mTOR, thereby preserving mTOR expression and augmenting autophagy in macrophages and kidney cells during LPS-induced inflammation.","method":"CaMKIV null mice; LPS-induced autophagy assays; GSK-3β phosphorylation measurement; mTOR ubiquitination assay; CaMKIV inhibitor experiments","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout and pharmacologic inhibition with mechanistic phosphorylation readouts, single lab with multiple pathway measurements","pmids":["25070845"],"is_preprint":false},{"year":2017,"finding":"Soluble amyloid-β (sAβ1-42) causes increased phosphorylation of CaMKIV and its substrate synapsin, which markedly inhibits synaptic vesicle trafficking along axons between synapses; a CaMKK inhibitor or phosphodeficient synapsin mutant prevented these defects and restored activity-dependent synaptogenesis.","method":"Quantum dot single-particle tracking of synaptic vesicles; CaMKK inhibitor; phosphodeficient synapsin mutant; calcium imaging; transgenic AD mouse neurons","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single-particle tracking with pharmacologic and genetic rescue (phosphodeficient mutant), single lab with multiple orthogonal approaches","pmids":["28698220"],"is_preprint":false},{"year":2012,"finding":"CaMK4 regulates β-cell proliferation and apoptosis in a CREB-dependent manner; constitutively active CaMK4 stimulates β-cell proliferation and survival, while dominant-negative CaMK4 increases apoptosis; CaMK4 acts upstream of CREB to induce IRS-2 expression, and CREB is required for CaMK4's effects.","method":"Constitutively active and dominant-negative CaMK4 expression in MIN6 β-cells; IRS-2 knockdown; CREB dominant-negative rescue experiments; proliferation and apoptosis assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional genetic manipulation with epistasis (CREB rescue of CaMK4 effects), single lab","pmids":["23049845"],"is_preprint":false},{"year":2006,"finding":"CaMKIV is required for development of opioid analgesic tolerance but not acute morphine analgesia or physical dependence; CaMKIV knockout mice show less morphine-induced CREB phosphorylation and less G-protein uncoupling from the µ-opioid receptor after chronic morphine.","method":"CaMKIV knockout mice; chronic morphine tolerance assay; CREB phosphorylation measurement; G-protein coupling assay for µ-opioid receptor","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with mechanistic readouts (pCREB, G-protein coupling), single lab","pmids":["16630062"],"is_preprint":false},{"year":2020,"finding":"Loss of CAMK4 leads to abnormal post-translational modifications and turnover of transferrin in mouse cerebellum and liver, associated with iron dyshomeostasis; CAMKK2-CAMK4 signaling regulates intracellular Ca2+ homeostasis during transferrin receptor-mediated endocytosis.","method":"CAMK4 knockout mice; CRISPR/Cas9 CAMKK2/CAMK4 deleted HEK293 cells; transferrin trafficking assays; calcium homeostasis measurements; post-translational modification analysis","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout in mice plus CRISPR cell lines with functional trafficking assays, single lab","pmids":["32460794"],"is_preprint":false},{"year":2024,"finding":"CaMK4 controls Tfh cell expansion and function by regulating Bcl6 transcription through CREMα; in the absence of CaMK4 in T cells, germinal center formation and humoral immunity are impaired; in human Tfh cells, CaMK4 inhibition reduces BCL6 expression and IL-21 secretion, impairing plasmablast formation.","method":"T cell-specific CaMK4 knockout mice; immunization and autoimmunity models; Bcl6 transcription assay; CaMK4 inhibition in human Tfh cells; plasmablast formation assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — T cell-specific genetic knockout, pharmacologic inhibition in human cells, multiple orthogonal readouts (germinal centers, antibody titers, Bcl6/IL-21), mouse and human validation","pmids":["38287012"],"is_preprint":false},{"year":2018,"finding":"A de novo splice-site variant (c.981+1G>A) in CAMK4 causes selective loss of the carboxy-terminal regulatory domain of CaMKIV and results in constitutive CaMKIV activity; biochemical studies in proband-derived cells confirmed an activating effect of the variant.","method":"Trio whole-exome sequencing; cDNA analysis of aberrant splicing; biochemical kinase activity assay in proband-derived cells; in silico structural comparison with known constitutively active synthetic mutants","journal":"Cold Spring Harbor molecular case studies","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional biochemical validation in patient cells plus cDNA splicing confirmation, single subject/lab","pmids":["30262571"],"is_preprint":false},{"year":2006,"finding":"CaMKIV phosphorylation controls HDAC5 cytoplasmic localization in undifferentiated H9C2 cells; CaMKIV (and/or PKD) keeps HDAC5 cytoplasmic in undifferentiated cells, while PP2A promotes nuclear HDAC5 in differentiated cells where it interacts with YY1 to regulate transcription.","method":"Subcellular fractionation; CaMKIV and PKD inhibitor/expression studies; HDAC5 localization by immunofluorescence; Co-IP of HDAC5 with YY1","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — localization experiments tied to functional transcriptional consequence, Co-IP, single lab","pmids":["16822951"],"is_preprint":false},{"year":2014,"finding":"CaMKIV activates survival proteins AKT, SIRT1, and FOXO3A in vitro, establishing CaMKIV as an activator of these pro-longevity signaling proteins.","method":"In vitro cell-based analysis of CaMKIV activation of AKT, SIRT1, and FOXO3A","journal":"Rejuvenation research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, in vitro cell-based assay, limited mechanistic detail in abstract","pmids":["21612516"],"is_preprint":false},{"year":2008,"finding":"TRPC6-mediated Ca2+ influx activates CaMKIV and promotes dendritic growth in hippocampal neurons; dominant-negative CaMKIV or inhibition of Ca2+ influx blocks TRPC6-induced dendritic growth; TRPC6 transgenic mice show enhanced CaMKIV and CREB phosphorylation and increased dendritic growth.","method":"TRPC6 overexpression/shRNA knockdown; dominant-negative CaMKIV; CaMKIV phosphorylation assay; dendritic morphology quantification; TRPC6 transgenic mice","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal gain- and loss-of-function approaches with morphological and biochemical readouts, single lab","pmids":["18559891"],"is_preprint":false},{"year":2019,"finding":"DJ-1 directly interacts with CaMKKβ and through this interaction modulates CaMKIV phosphorylation (Thr196/200) and CREB1 (Ser133) phosphorylation; Dj-1 knockout mice show decreased CaMKIV and CREB1 phosphorylation in substantia nigra with reduced tyrosine hydroxylase expression.","method":"DJ-1/CaMKKβ direct interaction assay; Dj-1 knockout mouse biochemical analysis; CaMKIV and CREB1 phosphorylation measurement; TH expression assay; CREB1 knockdown epistasis","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction demonstrated, knockout mice with signaling readouts, epistasis via CREB1 knockdown, single lab","pmids":["31232473"],"is_preprint":false},{"year":2014,"finding":"CaMKIV, through inhibitory phosphorylation of GSK-3β and preservation of mTOR expression, is required for autophagy and IL-6 production in macrophages during sepsis; this CaMKIV-mTOR-dependent autophagy is also cytoprotective in the kidney during endotoxemia.","method":"CaMKIV null mice; LPS endotoxemia model; CLP sepsis model; autophagy assays; GSK-3β and mTOR phosphorylation/expression measurement; IL-6 ELISA","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with mechanistic phosphorylation readouts in immune and kidney cells, single lab","pmids":["25070845"],"is_preprint":false},{"year":2022,"finding":"CaMK4 overexpression in ADPKD cells promotes mTOR signaling and cystic cell proliferation; CaMK4 knockdown reduces mTOR abundance and S6K phosphorylation; pharmacologic CaMK4 inhibition reduces mTOR signaling, inhibits proliferation, and reduces in vitro cyst formation independently of AMPK.","method":"CaMK4 knockdown in ADPKD cells; KN-93 pharmacologic inhibition; S6K/S6 phosphorylation assay; in vitro cyst formation assay; AMPK pathway analysis","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown plus pharmacologic inhibition with functional cyst formation readout, single lab","pmids":["36002021"],"is_preprint":false},{"year":2017,"finding":"RNAi screening identified CaMK4 as a host regulator specifically required for Cryptococcus neoformans uptake; pharmacologic CaMK4 inhibition recapitulates uptake defects; CaMK4-deficient mice show increased survival after C. neoformans infection, correlated with decreased expression of pattern recognition receptors on phagocytes.","method":"siRNA screen of 868 kinase/phosphatase genes; high-throughput imaging phagocytosis assay; CaMK4 inhibitor (pharmacologic); CaMK4 knockout mice infection model","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional siRNA screen with in vivo knockout validation and pharmacologic confirmation, single lab","pmids":["28970273"],"is_preprint":false},{"year":2025,"finding":"TRPC6 suppresses hepatic stellate cell (HSC) activation through CaMK4-mediated CREB phosphorylation; CREB directly interacts with the Acta2 promoter to inhibit its transcription; expression of constitutively active CREB1Y134F in HSCs attenuates BDL-induced liver fibrosis in TRPC6 knockout mice.","method":"ChIP and dual-luciferase reporter assays (CREB binding to Acta2 promoter); TRPC6 knockout/overexpression; adenoviral constitutively active CREB1Y134F expression; mouse liver fibrosis models; CaMK4 phosphorylation assay","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP demonstrating direct CREB-Acta2 promoter interaction, constitutively active rescue experiment in vivo, multiple orthogonal approaches in one study","pmids":["39887689"],"is_preprint":false},{"year":2001,"finding":"Sustained Ca2+ entry (via voltage-sensitive Ca2+ channels or high NMDA) leads to calpain-mediated selective proteolysis of nuclear CaMKIV in cerebellar granule neurons; proteolysis is attenuated by nifedipine, APV, and CaM kinase inhibitors, and exacerbated by nuclear export inhibitor leptomycin B; despite CaMKIV down-regulation, CaMKIV/CREB signaling is preserved.","method":"Immunoblotting for CaMKIV in cerebellar neurons under different K+/NMDA conditions; calpain inhibitor assay; leptomycin B nuclear export inhibition; CREB phosphorylation assay","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacologic tools with biochemical readouts, single lab, nuclear-specific proteolysis mechanism established","pmids":["12064479"],"is_preprint":false},{"year":2014,"finding":"CaMKIV, through inhibitory GSK-3β serine phosphorylation and FBXW7 inhibition, prevents mTOR ubiquitin-proteasomal degradation, thereby enabling mTOR-dependent autophagy in macrophages and kidney in the context of sepsis; this CaMKIV-mTOR-dependent autophagy is required for IL-6 production.","method":"CaMKIV null mice; LPS/CLP sepsis models; mTOR ubiquitination and expression assays; IL-6 measurement; GSK-3β phosphorylation assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacologic approach with defined mechanism (GSK-3β/FBXW7/mTOR axis), single lab","pmids":["25070845"],"is_preprint":false},{"year":2009,"finding":"CaMKK/CaMKIV cascade activation is required for exendin-4-induced glucokinase (GK) gene transcription in pancreatic β-cells; CaMKIV Thr196 phosphorylation peaks at 15 min after exendin-4 treatment; constitutively active CaMKIV enhances GK promoter activity.","method":"Reporter gene assay; real-time PCR; Western blot for CaMKIV Thr196 phosphorylation; CaMKK inhibitor STO-609; constitutively active CaMKIV expression in INS-1 cells","journal":"Diabetes, obesity & metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacologic and genetic gain-of-function with promoter and protein expression readouts, single lab","pmids":["19486109"],"is_preprint":false},{"year":2011,"finding":"PKA activates and phosphorylates RORα4 at Ser-99 in vitro; CaMK-IV-triggered increases in RORα4 transcriptional activity are blocked by PKA inhibitor H89, indicating CaMKIV acts through PKA to activate RORα4.","method":"In vitro kinase assay; Ser-99 to Ala mutation of RORα4; PKA inhibitor H89; RORα4 transcriptional activity reporter assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, pharmacologic epistasis, single lab","pmids":["21514275"],"is_preprint":false},{"year":2014,"finding":"IB4-binding DRG neurons express a novel 3'-UTR-extended CaMK4 mRNA isoform that is preferentially expressed in these neurons and associates with axonal localization of CaMKIV protein; in IB4+ axons, 20% of CaMKIV co-localizes with the endocytic marker Rab7 in axons co-expressing CAMKK.","method":"FISH with riboprobes; RACE and RT-PCR cDNA sequencing; quantitative PCR of FACS-sorted DRG neurons; immunohistochemical co-localization with Rab7 and CAMKK","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel transcript identified by RACE/sequencing, FISH localization, and co-localization with endosomal markers, single lab","pmids":["23817991"],"is_preprint":false},{"year":2022,"finding":"CaMK4 promotes NLRP3 inflammasome activation in type II alveolar epithelial cells during LPS-induced acute lung injury; inhibition or silencing of CaMK4 reduces NLRP3 and caspase-1 activation and IL-1β production in AEC II cells.","method":"CaMK4 inhibitor KN-93 and CaMK4 siRNA in A549 cells and LPS-induced ALI mice; NLRP3/caspase-1/IL-1β measurement by Western blot and ELISA; immunofluorescence","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacologic and genetic inhibition with specific inflammasome readouts in vitro and in vivo, single lab","pmids":["35734175"],"is_preprint":false},{"year":2007,"finding":"CaMKIV and calcineurin A both transactivate the PGC-1α promoter in rat skeletal muscle; however, only CaMKIV (not calcineurin A) transactivates the cytochrome c promoter, demonstrating differential downstream target specificity.","method":"Gene electrotransfer of CaMKIV and calcineurin A expression vectors into rat tibialis anterior muscle; PGC-1α and cytochrome c promoter-reporter assays","journal":"Pflugers Archiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gene transfer with specific promoter reporter assays, single lab, differential target specificity established","pmids":["17273866"],"is_preprint":false},{"year":2024,"finding":"TIPRL binds to CaMKK2 and causes sustained CaMKK2-CaMK4 pathway activation; CaMK4 phosphorylates CREB at Ser129 and Ser133 for maximum CREB activation; activated CREB drives transcription of TIPRL, forming a positive feedback loop; this TIPRL-CaMKK2-CaMK4-CREB axis maintains lung CSC stemness and survival.","method":"Co-IP (TIPRL-CaMKK2 interaction); phosphorylation assays (CREB Ser129/Ser133); CREB reporter assay; TIPRL depletion in vivo lung metastasis model; CaMK4 activation measurement","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, phosphorylation mapping at specific sites, in vivo validation, single lab","pmids":["39076120"],"is_preprint":false}],"current_model":"CaMKIV (CAMK4) is a nuclear-enriched, calcium/calmodulin-activated serine/threonine kinase that is activated by CaMKK2 (phosphorylation of Thr196) and transported into the nucleus by importin-α independently of importin-β; once nuclear, CaMKIV phosphorylates and activates the transcription factor CREB (and related factors CREM-α, CREMα), driving expression of target genes (c-Fos, BDNF, IRS-2, Bcl6, tyrosine hydroxylase, glucokinase, GLUT2, ABCA1, osteopontin) critical for long-term memory consolidation, L-LTP, cerebellar LTD, Th17/Tfh cell differentiation, spermiogenesis (via protamine-2 phosphorylation), neuronal survival, and vascular tone (via eNOS); CaMKIV also phosphorylates non-transcription-factor substrates including DRP1-Ser616 (promoting mitochondrial fission), 14-3-3β (releasing synaptopodin in podocytes), Notch1-IC (protecting it from Fbw7/proteasomal degradation to enhance osteoclastogenesis), OGT (activating O-GlcNAcylation), and synapsin (regulating synaptic vesicle trafficking); it modulates the AKT/mTOR pathway (in Th17 cells and podocytes), GSK-3β/FBXW7/mTOR axis (controlling autophagy in sepsis), and cytoskeletal GTPases Rac1/RhoA (in podocytes), while caspase-3 can cleave and inactivate CaMKIV as a feedback mechanism during apoptosis."},"narrative":{"mechanistic_narrative":"CAMK4 encodes CaMKIV, a calcium/calmodulin-activated serine/threonine kinase that functions as a nuclear effector of calcium signaling, principally by phosphorylating and activating the transcription factor CREB and the related factor CREM to drive activity-dependent gene programs [PMID:11572782, PMID:19605628, PMID:24667640]. Activation flows through an upstream CaMKK module (CaMKK2/CaMKKβ phosphorylating Thr196/200), which can be scaffolded or tuned by partner proteins such as TIPRL and DJ-1, and selective nuclear delivery of CaMKIV is achieved through direct binding to the C-terminal region of importin-α, which imports the kinase independently of importin-β [PMID:15719015, PMID:31232473, PMID:39076120]. In neurons this nuclear CaMKIV→CREB axis is required for activity-induced c-Fos and BDNF expression and underlies long-term forms of plasticity including late-LTP, cerebellar LTD, synaptic scaling, neuronal survival, and dendritic growth downstream of TRPC6-mediated calcium entry [PMID:11572782, PMID:10433267, PMID:19605628, PMID:28592691, PMID:18559891]. Beyond the nervous system, CaMKIV drives CREM/CREB-dependent transcriptional programs that govern T cell fates—suppressing IL-2 and promoting Th17 differentiation and Tfh expansion via Bcl6—linking the kinase to autoimmunity [PMID:15841182, PMID:24667640, PMID:38287012]. CaMKIV also acts on non-transcription-factor substrates: it phosphorylates protamine-2 during spermiogenesis (and its loss causes male infertility), DRP1-Ser616 to promote mitochondrial fission during sepsis, 14-3-3β to destabilize synaptopodin and remodel podocyte actin via Rac1/RhoA, Notch1-IC to protect it from Fbw7-dependent degradation during osteoclastogenesis, OGT to enhance O-GlcNAcylation, and synapsin to regulate synaptic vesicle trafficking [PMID:10932193, PMID:32932146, PMID:29985166, PMID:23103515, PMID:18029144, PMID:28698220]. It additionally tunes the GSK-3β/FBXW7/mTOR axis to control autophagy and inflammatory output and is itself negatively regulated by caspase-3 and calpain-mediated proteolysis during cell death [PMID:25070845, PMID:11149901, PMID:12064479]. A de novo splice variant removing the C-terminal regulatory domain renders CaMKIV constitutively active, demonstrating that the autoregulatory domain restrains kinase output in humans [PMID:30262571].","teleology":[{"year":2000,"claim":"Established the first defined physiological substrate and in vivo requirement for CaMKIV, showing it phosphorylates protamine-2 and is essential for the chromatin protein exchange of spermiogenesis.","evidence":"Targeted Camk4 knockout mice with in vitro kinase assay and spermatid histology","pmids":["10932193"],"confidence":"High","gaps":["Whether protamine-2 phosphorylation is direct in vivo not fully resolved","Other spermatid substrates not identified"]},{"year":2001,"claim":"Showed that nuclear CaMKIV→CREB signaling is selectively required for the late, transcription-dependent phase of plasticity and memory, distinguishing it from early plasticity.","evidence":"Forebrain-restricted dominant-negative CaMKIV transgenic mice with LTP and behavioral readouts","pmids":["11572782"],"confidence":"High","gaps":["Specific target genes downstream of CREB in memory not enumerated here","Cell-type specificity within forebrain not resolved"]},{"year":2001,"claim":"Defined CaMKIV as a bidirectional regulator of neuronal survival and identified caspase-3 cleavage as a feedback brake during apoptosis.","evidence":"Dominant-active/negative CaMKIV in cerebellar granule neurons with caspase-3 assay","pmids":["11149901"],"confidence":"Medium","gaps":["Cleavage site and consequence for kinase activity not fully mapped","Single-lab"]},{"year":2005,"claim":"Resolved how CaMKIV reaches the nucleus, showing direct importin-α binding mediates importin-β-independent nuclear import.","evidence":"Permeabilized-cell import assays, direct binding, and in vivo microinjection","pmids":["15719015"],"confidence":"High","gaps":["Regulation of import by calcium/activation state not addressed","Nuclear export pathway not defined here"]},{"year":2005,"claim":"Extended CaMKIV signaling beyond neurons, linking it to CREM-mediated IL-2 suppression in T cells and to lupus pathophysiology.","evidence":"Dominant-inactive CaMKIV in normal T cells with IL-2 promoter and CREM binding assays","pmids":["15841182"],"confidence":"Medium","gaps":["Direct CaMKIV-CREM phosphorylation not shown here","Single-lab dominant-negative approach"]},{"year":2009,"claim":"Demonstrated a CaMKK2→CaMKIV→CREB→BDNF cascade controlling cerebellar granule cell migration, with rescue establishing necessity of each kinase.","evidence":"CaMKK2 and CaMKIV null mice with reexpression rescue and migration/BDNF readouts","pmids":["19605628"],"confidence":"High","gaps":["Direct kinase-substrate steps inferred from pathway epistasis","BDNF autocrine loop dynamics not fully resolved"]},{"year":2014,"claim":"Identified CaMK4 as a Th17-selective driver acting via CREM-α and AKT/mTOR, nominating it as an autoimmunity therapeutic target.","evidence":"CaMK4 knockout mice, pharmacologic inhibition, and human SLE T cell siRNA","pmids":["24667640"],"confidence":"High","gaps":["Direct CaMK4 substrates in the AKT/mTOR arm not pinpointed","Mechanism of Th17-selective CaMK4 induction unknown"]},{"year":2014,"claim":"Mapped a CaMKIV→GSK-3β/FBXW7→mTOR axis preserving mTOR and enabling autophagy and inflammatory cytokine output in macrophages and kidney during sepsis.","evidence":"CaMKIV null mice in LPS/CLP models with mTOR ubiquitination and GSK-3β phosphorylation assays","pmids":["25070845"],"confidence":"Medium","gaps":["Whether GSK-3β is a direct CaMKIV substrate not definitively shown","Single-lab"]},{"year":2016,"claim":"Showed CaMKIV directly phosphorylates and stabilizes a non-transcription-factor substrate, Notch1-IC, by blocking Fbw7-dependent degradation to promote osteoclastogenesis.","evidence":"Co-IP, in vitro kinase assay, phospho-deficient mutant, and osteoclast differentiation assays","pmids":["23103515"],"confidence":"High","gaps":["Phosphorylation site stoichiometry in vivo not quantified","Reciprocal validation of interaction limited"]},{"year":2018,"claim":"Defined a cytoplasmic CaMK4 function in podocytes, phosphorylating 14-3-3β to release/destabilize synaptopodin and remodeling Rac1/RhoA-dependent actin and motility.","evidence":"Overexpression/inhibition in podocytes with biochemical phosphorylation and targeted in vivo inhibitor delivery","pmids":["29985166"],"confidence":"High","gaps":["Direct 14-3-3β phosphosite not specified here","How CaMK4 partitions between nuclear and cytoplasmic functions unclear"]},{"year":2018,"claim":"Provided human genetic evidence that the C-terminal regulatory domain restrains CaMKIV, since its loss via a de novo splice variant yields constitutive activity.","evidence":"Trio exome sequencing, cDNA splicing analysis, and kinase activity in proband cells","pmids":["30262571"],"confidence":"Medium","gaps":["Single subject; phenotype-genotype correlation limited","Downstream pathway consequences in patient tissue not characterized"]},{"year":2020,"claim":"Connected CaMKIV to mitochondrial dynamics, showing direct DRP1-Ser616 phosphorylation promoting fission and a role in sepsis-associated respiratory slowing and mitophagy.","evidence":"CaMK4 knockout in CLP sepsis with in vitro DRP1 phosphorylation and fission/fusion immunoblotting","pmids":["32932146"],"confidence":"Medium","gaps":["Direct PINK1 kinase relationship stated without full reconstitution","Single-lab"]},{"year":2024,"claim":"Established CaMK4 as a controller of Tfh expansion and humoral immunity through CREM-α-driven Bcl6 transcription, validated in mouse and human cells.","evidence":"T cell-specific knockout, immunization/autoimmunity models, and human Tfh inhibition","pmids":["38287012"],"confidence":"High","gaps":["Direct CaMK4-CREMα phosphorylation step not shown here","Bcl6 enhancer-level regulation not mapped"]},{"year":2025,"claim":"Showed a TRPC6→CaMK4→CREB axis that transcriptionally represses Acta2 to limit hepatic stellate cell activation and fibrosis, with direct promoter occupancy demonstrated.","evidence":"ChIP/luciferase for CREB-Acta2, TRPC6 manipulation, and constitutively active CREB rescue in fibrosis models","pmids":["39887689"],"confidence":"High","gaps":["Mechanism by which CREB represses rather than activates Acta2 not detailed","CaMK4 phosphosite on CREB in this context not mapped"]},{"year":null,"claim":"How CaMKIV's substrate selection and subcellular partitioning are governed across its many contexts—nuclear CREB/CREM transcription versus cytoplasmic substrates (DRP1, 14-3-3β, synapsin, Notch1-IC, OGT)—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural/regulatory model explains tissue-specific substrate choice","Quantitative in vivo phosphoproteome of CaMKIV not established","Determinants of nuclear vs cytoplasmic activity unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,7,16,17,14,19]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,16,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,23,32]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2,10,12,33]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,25,37]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,9,23,32]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,27,28,40]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,3,23,31,38]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,5,11,19]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[29,34]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[10]}],"complexes":[],"partners":["CAMKK2","CREB1","CREM","KPNA (IMPORTIN-ALPHA)","NOTCH1","OGT","YWHAB","TIPRL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q16566","full_name":"Calcium/calmodulin-dependent protein kinase type IV","aliases":["CaM kinase-GR"],"length_aa":473,"mass_kda":51.9,"function":"Calcium/calmodulin-dependent protein kinase that operates in the calcium-triggered CaMKK-CaMK4 signaling cascade and regulates, mainly by phosphorylation, the activity of several transcription activators, such as CREB1, MEF2D, JUN and RORA, which play pivotal roles in immune response, inflammation, and memory consolidation. In the thymus, regulates the CD4(+)/CD8(+) double positive thymocytes selection threshold during T-cell ontogeny. In CD4 memory T-cells, is required to link T-cell antigen receptor (TCR) signaling to the production of IL2, IFNG and IL4 (through the regulation of CREB and MEF2). Regulates the differentiation and survival phases of osteoclasts and dendritic cells (DCs). Mediates DCs survival by linking TLR4 and the regulation of temporal expression of BCL2. Phosphorylates the transcription activator CREB1 on 'Ser-133' in hippocampal neuron nuclei and contribute to memory consolidation and long term potentiation (LTP) in the hippocampus. Can activate the MAP kinases MAPK1/ERK2, MAPK8/JNK1 and MAPK14/p38 and stimulate transcription through the phosphorylation of ELK1 and ATF2. Can also phosphorylate in vitro CREBBP, PRM2, MEF2A and STMN1/OP18","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q16566/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CAMK4","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":[],"url":"https://opencell.sf.czbiohub.org/search/CAMK4","total_profiled":1310},"omim":[{"mim_id":"615002","title":"CALCIUM/CALMODULIN-DEPENDENT PROTEIN KINASE KINASE 2, BETA; CAMKK2","url":"https://www.omim.org/entry/615002"},{"mim_id":"611502","title":"CENTROMERIC PROTEIN K; CENPK","url":"https://www.omim.org/entry/611502"},{"mim_id":"611411","title":"CALCIUM/CALMODULIN-DEPENDENT PROTEIN KINASE KINASE 1, ALPHA; CAMKK1","url":"https://www.omim.org/entry/611411"},{"mim_id":"610378","title":"GLIS FAMILY ZINC FINGER PROTEIN 1; GLIS1","url":"https://www.omim.org/entry/610378"},{"mim_id":"605544","title":"FIBROMATOSIS, GINGIVAL, 2; GINGF2","url":"https://www.omim.org/entry/605544"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli fibrillar center","reliability":"Supported"},{"location":"Endoplasmic reticulum","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":52.7},{"tissue":"lymphoid tissue","ntpm":51.6}],"url":"https://www.proteinatlas.org/search/CAMK4"},"hgnc":{"alias_symbol":["CaMK-GR","CaMKIV"],"prev_symbol":[]},"alphafold":{"accession":"Q16566","domains":[{"cath_id":"3.30.200.20","chopping":"43-120","consensus_level":"high","plddt":85.92,"start":43,"end":120},{"cath_id":"1.10.510.10","chopping":"125-312","consensus_level":"high","plddt":89.9944,"start":125,"end":312}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16566","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q16566-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q16566-F1-predicted_aligned_error_v6.png","plddt_mean":70.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CAMK4","jax_strain_url":"https://www.jax.org/strain/search?query=CAMK4"},"sequence":{"accession":"Q16566","fasta_url":"https://rest.uniprot.org/uniprotkb/Q16566.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q16566/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16566"}},"corpus_meta":[{"pmid":"11572782","id":"PMC_11572782","title":"An 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CaMKIV restricted to postnatal forebrain; hippocampal LTP recordings; behavioral memory tests\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean transgenic loss-of-function with multiple orthogonal readouts (LTP, CREB phosphorylation, behavior), replicated across multiple assays in one rigorous study\",\n      \"pmids\": [\"11572782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CaMKIV (Camk4) phosphorylates protamine-2 in vitro; Camk4 knockout male mice are infertile due to impaired spermiogenesis, with specific loss of protamine-2 and prolonged retention of transition protein-2 in elongating spermatids, indicating a role for CaMKIV in the sequential exchange of basic nuclear proteins on chromatin during spermiogenesis.\",\n      \"method\": \"Targeted gene knockout in mice; in vitro kinase assay (CaMKIV phosphorylation of protamine-2); histological analysis of spermatids\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay demonstrating substrate phosphorylation combined with clean knockout phenotype with specific protein-level readout\",\n      \"pmids\": [\"10932193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CaMKIV is required for SLE serum IgG (via anti-TCR/CD3 autoantibodies)-induced overexpression of CREM and its increased binding to the IL-2 promoter, thereby suppressing IL-2 production in T cells; dominant-inactive CaMKIV abolished this effect.\",\n      \"method\": \"Dominant-inactive CaMKIV expression in normal T cells; IL-2 promoter activity assay; CREM binding assay; nuclear localization of CaMKIV assessed by subcellular fractionation\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative approach with multiple transcriptional readouts (promoter activity, CREM binding, IL-2 production), single lab\",\n      \"pmids\": [\"15841182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CaMK4 is required for Th17 cell differentiation; genetic or pharmacologic inhibition of CaMK4 reduces IL-17 production by decreasing activation of CREM-α and the AKT/mTOR pathway; CaMK4 levels increase selectively under Th17-inducing conditions but not Treg, Th1, or Th2 conditions.\",\n      \"method\": \"CaMK4 knockout mice; pharmacologic inhibition; naive T cell differentiation assays; IL17A/IL17F mRNA measurement; CaMK4 siRNA in human SLE T cells\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout, pharmacologic inhibition, and human cell siRNA knockdown with specific transcriptional and signaling readouts across multiple orthogonal approaches\",\n      \"pmids\": [\"24667640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Acute in vivo expression of constitutively active CaMKIV or CREB enhances NMDA receptor-mediated synaptic responses and LTP, and generates electrophysiological and morphological features consistent with 'silent synapses' in rodent hippocampus.\",\n      \"method\": \"Viral-mediated gene transfer of constitutively active CaMKIV in vivo; electrophysiology; morphological analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — viral gain-of-function with multiple orthogonal readouts (electrophysiology + morphology) in vivo\",\n      \"pmids\": [\"15748849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CaMKIV activation is necessary for the late phase of cerebellar LTD; dominant-inhibitory CaMKIV constructs attenuated the late phase of LTD in cultured Purkinje neurons, while inhibition of PKA or MAPK/RSK cascades had no effect.\",\n      \"method\": \"Particle-mediated transfection of dominant-inhibitory CaMKIV in cultured Purkinje neurons; LTD measurement by electrophysiology\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative approach with defined phenotypic readout, epistasis with other kinase pathways tested, single lab\",\n      \"pmids\": [\"10433267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaMKIV activates endothelial nitric oxide synthase (eNOS) in vitro; CaMK4 knockout mice display hypertension, cardiac hypertrophy, and vascular/kidney damage, establishing CaMKIV as a regulator of vascular tone through eNOS activation.\",\n      \"method\": \"CaMK4 knockout mouse cardiovascular phenotyping; in vitro kinase assay demonstrating CaMKIV-dependent eNOS activation\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout phenotype plus in vitro eNOS activation assay, single lab, two orthogonal approaches\",\n      \"pmids\": [\"23130158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CaMK4 modulates podocyte motility by altering expression of GTPases Rac1 and RhoA; CaMK4 phosphorylates scaffold protein 14-3-3β, releasing and destabilizing synaptopodin; CaMK4 suppresses nephrin, synaptopodin, and actin fiber expression in podocytes.\",\n      \"method\": \"CaMK4 overexpression/inhibition in podocytes; in vivo and in vitro assays of podocyte motility; phosphorylation of 14-3-3β shown by biochemical assay; targeted delivery of CaMK4 inhibitor to podocytes in lupus-prone mice\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal mechanisms identified (Rac1/RhoA regulation, 14-3-3β phosphorylation, synaptopodin degradation) with in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"29985166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CaMKK2 signals through CaMKIV to control liver cancer cell growth; CaMKK2 acts as a scaffold assembling CaMKIV with mTOR/S6K pathway components to stimulate protein synthesis; ectopic expression of wild-type but not kinase-inactive CaMKK2 rescues growth defects from CaMKK2 loss.\",\n      \"method\": \"RNAi ablation of CaMKK2; ectopic expression of wild-type vs. kinase-inactive CaMKK2; CaMKIV-dependent signaling assays; in vivo tumorigenicity assays\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis with kinase-inactive rescue and in vivo validation, but CaMKIV role inferred partly from pathway data without CaMKIV-specific reconstitution, single lab\",\n      \"pmids\": [\"25847065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CaMKK2 and CaMKIV are required for BDNF-dependent cerebellar granule cell migration; loss of either kinase reduces CREB phosphorylation, BDNF mRNA (exons I and IV), and BDNF protein; reexpression of CaMKK2 or CaMKIV in null granule cells restores pCREB and BDNF; exogenous BDNF rescues migration in vitro.\",\n      \"method\": \"CaMKK2 and CaMKIV null mice; in vitro and in vivo granule cell migration assays; reexpression rescue experiments; CREB phosphorylation and BDNF measurement\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with rescue experiments and multiple orthogonal readouts (migration, pCREB, BDNF protein), single lab but rigorous\",\n      \"pmids\": [\"19605628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Importin-α transports CaMKIV into the nucleus independently of importin-β; CaMKIV directly interacts with the C-terminal region of importin-α; the CaMKIV/importin-α complex does not form a ternary complex with importin-β; microinjection of importin-α-ΔIBB enhances nuclear translocation of CaMKIV in vivo.\",\n      \"method\": \"Digitonin-permeabilized cell nuclear import assay; direct binding assay (importin-α C-terminus pulldown); cytoplasmic microinjection of importin-α-ΔIBB; fluorescence microscopy\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution of nuclear import, direct binding assay, and in vivo microinjection with multiple orthogonal methods in one study\",\n      \"pmids\": [\"15719015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CaMKIV jointly regulates excitatory synaptic scaling and intrinsic excitability in neocortical pyramidal neurons through a cell-autonomous bidirectional mechanism; dominant-negative and constitutively active nuclear CaMKIV manipulations shift spontaneous firing rates, but inhibitory synaptic scaling is unaffected by these manipulations.\",\n      \"method\": \"Dominant-negative and constitutively active nuclear CaMKIV expression in individual neocortical neurons; electrophysiological measurement of excitatory quantal amplitude, intrinsic excitability, and inhibitory quantal amplitude\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional genetic manipulation (dnCaMKIV and caCaMKIV) with multiple orthogonal electrophysiological readouts, cell-autonomous design\",\n      \"pmids\": [\"28592691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaMKII and CaMKIV act additively and in parallel to promote neuronal survival in spiral ganglion neurons; CaMKIV requires CREB to promote survival (consistent with its exclusive nuclear localization), whereas CaMKII promotes survival via functional inactivation of Bad, independent of CREB.\",\n      \"method\": \"Expression of dominant-inhibitory CaMKIV and GFP-AIP (CaMKII inhibitor) in neonatal rat spiral ganglion neurons; constitutively active CaMKII and CREB constructs; survival assays\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with dominant-negative and constitutively active constructs, two kinases dissected in parallel, single lab\",\n      \"pmids\": [\"17651987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CaMKIV promotes neuronal survival; a dominant-active CaMKIV mutant inhibits apoptosis in cerebellar granule neurons under low-K+ conditions, while dominant-negative CaMKIV induces apoptosis under high-K+ conditions; caspase-3 cleaves CaMKIV during apoptosis, providing a feedback mechanism.\",\n      \"method\": \"Overexpression of dominant-active and dominant-negative CaMKIV mutants by gene transfer in cerebellar neurons; caspase-3 activity assay; CREB phosphorylation measurement\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional genetic manipulation with defined apoptotic phenotype and caspase-3 cleavage demonstrated, single lab\",\n      \"pmids\": [\"11149901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaMKIV specifically phosphorylates and activates OGT (O-GlcNAc transferase) both in vivo and in vitro under depolarization conditions; CaMKIV-dependent OGT activation is required for AP-1 activation and TIMP-1 gene expression in neuronal cells.\",\n      \"method\": \"In vivo and in vitro kinase assay (CaMKIV phosphorylation of OGT); CaMK inhibitor experiments; AP-1 reporter assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay demonstrating substrate phosphorylation plus in vivo corroboration with inhibitor, single lab\",\n      \"pmids\": [\"18029144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CaMKIV is necessary for BDNF-induced phosphorylation of CREB and for overcoming MAG-mediated inhibition of axonal growth; pharmacologic inhibition or dominant-negative CaMKIV blocks the neurotrophin effect; calcium flux from intracellular stores is required for this CaMKIV signaling.\",\n      \"method\": \"Pharmacologic CaMKIV inhibition; dominant-negative CaMKIV overexpression; neurite outgrowth assay on MAG substrate; CREB phosphorylation measurement\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacologic and genetic inhibition with functional axon growth readout, single lab, two orthogonal inhibition approaches\",\n      \"pmids\": [\"18381242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaMK4 promotes osteoclast differentiation by directly interacting with and phosphorylating the Notch1 intracellular domain (Notch1-IC), which decreases Fbw7-dependent proteasomal degradation and increases Notch1-IC stability; kinase activity of CaMKIV is essential for this effect.\",\n      \"method\": \"Co-IP (direct interaction between CaMKIV and Notch1-IC); in vitro kinase assay; phosphorylation-deficient Notch1-IC mutant; ubiquitin-proteasome assay; osteoclast differentiation assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding (Co-IP), in vitro phosphorylation, mutagenesis of phosphorylation site, and functional differentiation readout in one study\",\n      \"pmids\": [\"23103515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CaMKIV mediates an adaptive slowing of oxidative respiration during sepsis; CaMKIV directly phosphorylates DRP1 at Ser616 to promote mitochondrial fission, reduces expression of fusion proteins Mfn1/2 and OPA-1, and acts as a direct PINK1 kinase to enable mitophagy.\",\n      \"method\": \"CaMK4 knockout mice subjected to CLP sepsis; in vitro phosphorylation assay (DRP1 Ser616); mitochondrial respiration measurement; immunoblotting for fission/fusion proteins and PINK1/Parkin\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct phosphorylation assay for DRP1 combined with in vivo knockout, but PINK1 kinase relationship stated as direct without full reconstitution detail in abstract\",\n      \"pmids\": [\"32932146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CaMKIV, through inhibitory serine phosphorylation of GSK-3β and inhibition of FBXW7 recruitment, prevents ubiquitin-proteasomal degradation of mTOR, thereby preserving mTOR expression and augmenting autophagy in macrophages and kidney cells during LPS-induced inflammation.\",\n      \"method\": \"CaMKIV null mice; LPS-induced autophagy assays; GSK-3β phosphorylation measurement; mTOR ubiquitination assay; CaMKIV inhibitor experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout and pharmacologic inhibition with mechanistic phosphorylation readouts, single lab with multiple pathway measurements\",\n      \"pmids\": [\"25070845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Soluble amyloid-β (sAβ1-42) causes increased phosphorylation of CaMKIV and its substrate synapsin, which markedly inhibits synaptic vesicle trafficking along axons between synapses; a CaMKK inhibitor or phosphodeficient synapsin mutant prevented these defects and restored activity-dependent synaptogenesis.\",\n      \"method\": \"Quantum dot single-particle tracking of synaptic vesicles; CaMKK inhibitor; phosphodeficient synapsin mutant; calcium imaging; transgenic AD mouse neurons\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-particle tracking with pharmacologic and genetic rescue (phosphodeficient mutant), single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"28698220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaMK4 regulates β-cell proliferation and apoptosis in a CREB-dependent manner; constitutively active CaMK4 stimulates β-cell proliferation and survival, while dominant-negative CaMK4 increases apoptosis; CaMK4 acts upstream of CREB to induce IRS-2 expression, and CREB is required for CaMK4's effects.\",\n      \"method\": \"Constitutively active and dominant-negative CaMK4 expression in MIN6 β-cells; IRS-2 knockdown; CREB dominant-negative rescue experiments; proliferation and apoptosis assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional genetic manipulation with epistasis (CREB rescue of CaMK4 effects), single lab\",\n      \"pmids\": [\"23049845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CaMKIV is required for development of opioid analgesic tolerance but not acute morphine analgesia or physical dependence; CaMKIV knockout mice show less morphine-induced CREB phosphorylation and less G-protein uncoupling from the µ-opioid receptor after chronic morphine.\",\n      \"method\": \"CaMKIV knockout mice; chronic morphine tolerance assay; CREB phosphorylation measurement; G-protein coupling assay for µ-opioid receptor\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with mechanistic readouts (pCREB, G-protein coupling), single lab\",\n      \"pmids\": [\"16630062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of CAMK4 leads to abnormal post-translational modifications and turnover of transferrin in mouse cerebellum and liver, associated with iron dyshomeostasis; CAMKK2-CAMK4 signaling regulates intracellular Ca2+ homeostasis during transferrin receptor-mediated endocytosis.\",\n      \"method\": \"CAMK4 knockout mice; CRISPR/Cas9 CAMKK2/CAMK4 deleted HEK293 cells; transferrin trafficking assays; calcium homeostasis measurements; post-translational modification analysis\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout in mice plus CRISPR cell lines with functional trafficking assays, single lab\",\n      \"pmids\": [\"32460794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CaMK4 controls Tfh cell expansion and function by regulating Bcl6 transcription through CREMα; in the absence of CaMK4 in T cells, germinal center formation and humoral immunity are impaired; in human Tfh cells, CaMK4 inhibition reduces BCL6 expression and IL-21 secretion, impairing plasmablast formation.\",\n      \"method\": \"T cell-specific CaMK4 knockout mice; immunization and autoimmunity models; Bcl6 transcription assay; CaMK4 inhibition in human Tfh cells; plasmablast formation assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — T cell-specific genetic knockout, pharmacologic inhibition in human cells, multiple orthogonal readouts (germinal centers, antibody titers, Bcl6/IL-21), mouse and human validation\",\n      \"pmids\": [\"38287012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A de novo splice-site variant (c.981+1G>A) in CAMK4 causes selective loss of the carboxy-terminal regulatory domain of CaMKIV and results in constitutive CaMKIV activity; biochemical studies in proband-derived cells confirmed an activating effect of the variant.\",\n      \"method\": \"Trio whole-exome sequencing; cDNA analysis of aberrant splicing; biochemical kinase activity assay in proband-derived cells; in silico structural comparison with known constitutively active synthetic mutants\",\n      \"journal\": \"Cold Spring Harbor molecular case studies\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional biochemical validation in patient cells plus cDNA splicing confirmation, single subject/lab\",\n      \"pmids\": [\"30262571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CaMKIV phosphorylation controls HDAC5 cytoplasmic localization in undifferentiated H9C2 cells; CaMKIV (and/or PKD) keeps HDAC5 cytoplasmic in undifferentiated cells, while PP2A promotes nuclear HDAC5 in differentiated cells where it interacts with YY1 to regulate transcription.\",\n      \"method\": \"Subcellular fractionation; CaMKIV and PKD inhibitor/expression studies; HDAC5 localization by immunofluorescence; Co-IP of HDAC5 with YY1\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — localization experiments tied to functional transcriptional consequence, Co-IP, single lab\",\n      \"pmids\": [\"16822951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CaMKIV activates survival proteins AKT, SIRT1, and FOXO3A in vitro, establishing CaMKIV as an activator of these pro-longevity signaling proteins.\",\n      \"method\": \"In vitro cell-based analysis of CaMKIV activation of AKT, SIRT1, and FOXO3A\",\n      \"journal\": \"Rejuvenation research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, in vitro cell-based assay, limited mechanistic detail in abstract\",\n      \"pmids\": [\"21612516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRPC6-mediated Ca2+ influx activates CaMKIV and promotes dendritic growth in hippocampal neurons; dominant-negative CaMKIV or inhibition of Ca2+ influx blocks TRPC6-induced dendritic growth; TRPC6 transgenic mice show enhanced CaMKIV and CREB phosphorylation and increased dendritic growth.\",\n      \"method\": \"TRPC6 overexpression/shRNA knockdown; dominant-negative CaMKIV; CaMKIV phosphorylation assay; dendritic morphology quantification; TRPC6 transgenic mice\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal gain- and loss-of-function approaches with morphological and biochemical readouts, single lab\",\n      \"pmids\": [\"18559891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DJ-1 directly interacts with CaMKKβ and through this interaction modulates CaMKIV phosphorylation (Thr196/200) and CREB1 (Ser133) phosphorylation; Dj-1 knockout mice show decreased CaMKIV and CREB1 phosphorylation in substantia nigra with reduced tyrosine hydroxylase expression.\",\n      \"method\": \"DJ-1/CaMKKβ direct interaction assay; Dj-1 knockout mouse biochemical analysis; CaMKIV and CREB1 phosphorylation measurement; TH expression assay; CREB1 knockdown epistasis\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction demonstrated, knockout mice with signaling readouts, epistasis via CREB1 knockdown, single lab\",\n      \"pmids\": [\"31232473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CaMKIV, through inhibitory phosphorylation of GSK-3β and preservation of mTOR expression, is required for autophagy and IL-6 production in macrophages during sepsis; this CaMKIV-mTOR-dependent autophagy is also cytoprotective in the kidney during endotoxemia.\",\n      \"method\": \"CaMKIV null mice; LPS endotoxemia model; CLP sepsis model; autophagy assays; GSK-3β and mTOR phosphorylation/expression measurement; IL-6 ELISA\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with mechanistic phosphorylation readouts in immune and kidney cells, single lab\",\n      \"pmids\": [\"25070845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CaMK4 overexpression in ADPKD cells promotes mTOR signaling and cystic cell proliferation; CaMK4 knockdown reduces mTOR abundance and S6K phosphorylation; pharmacologic CaMK4 inhibition reduces mTOR signaling, inhibits proliferation, and reduces in vitro cyst formation independently of AMPK.\",\n      \"method\": \"CaMK4 knockdown in ADPKD cells; KN-93 pharmacologic inhibition; S6K/S6 phosphorylation assay; in vitro cyst formation assay; AMPK pathway analysis\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown plus pharmacologic inhibition with functional cyst formation readout, single lab\",\n      \"pmids\": [\"36002021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RNAi screening identified CaMK4 as a host regulator specifically required for Cryptococcus neoformans uptake; pharmacologic CaMK4 inhibition recapitulates uptake defects; CaMK4-deficient mice show increased survival after C. neoformans infection, correlated with decreased expression of pattern recognition receptors on phagocytes.\",\n      \"method\": \"siRNA screen of 868 kinase/phosphatase genes; high-throughput imaging phagocytosis assay; CaMK4 inhibitor (pharmacologic); CaMK4 knockout mice infection model\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional siRNA screen with in vivo knockout validation and pharmacologic confirmation, single lab\",\n      \"pmids\": [\"28970273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRPC6 suppresses hepatic stellate cell (HSC) activation through CaMK4-mediated CREB phosphorylation; CREB directly interacts with the Acta2 promoter to inhibit its transcription; expression of constitutively active CREB1Y134F in HSCs attenuates BDL-induced liver fibrosis in TRPC6 knockout mice.\",\n      \"method\": \"ChIP and dual-luciferase reporter assays (CREB binding to Acta2 promoter); TRPC6 knockout/overexpression; adenoviral constitutively active CREB1Y134F expression; mouse liver fibrosis models; CaMK4 phosphorylation assay\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP demonstrating direct CREB-Acta2 promoter interaction, constitutively active rescue experiment in vivo, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"39887689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Sustained Ca2+ entry (via voltage-sensitive Ca2+ channels or high NMDA) leads to calpain-mediated selective proteolysis of nuclear CaMKIV in cerebellar granule neurons; proteolysis is attenuated by nifedipine, APV, and CaM kinase inhibitors, and exacerbated by nuclear export inhibitor leptomycin B; despite CaMKIV down-regulation, CaMKIV/CREB signaling is preserved.\",\n      \"method\": \"Immunoblotting for CaMKIV in cerebellar neurons under different K+/NMDA conditions; calpain inhibitor assay; leptomycin B nuclear export inhibition; CREB phosphorylation assay\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacologic tools with biochemical readouts, single lab, nuclear-specific proteolysis mechanism established\",\n      \"pmids\": [\"12064479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CaMKIV, through inhibitory GSK-3β serine phosphorylation and FBXW7 inhibition, prevents mTOR ubiquitin-proteasomal degradation, thereby enabling mTOR-dependent autophagy in macrophages and kidney in the context of sepsis; this CaMKIV-mTOR-dependent autophagy is required for IL-6 production.\",\n      \"method\": \"CaMKIV null mice; LPS/CLP sepsis models; mTOR ubiquitination and expression assays; IL-6 measurement; GSK-3β phosphorylation assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacologic approach with defined mechanism (GSK-3β/FBXW7/mTOR axis), single lab\",\n      \"pmids\": [\"25070845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CaMKK/CaMKIV cascade activation is required for exendin-4-induced glucokinase (GK) gene transcription in pancreatic β-cells; CaMKIV Thr196 phosphorylation peaks at 15 min after exendin-4 treatment; constitutively active CaMKIV enhances GK promoter activity.\",\n      \"method\": \"Reporter gene assay; real-time PCR; Western blot for CaMKIV Thr196 phosphorylation; CaMKK inhibitor STO-609; constitutively active CaMKIV expression in INS-1 cells\",\n      \"journal\": \"Diabetes, obesity & metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacologic and genetic gain-of-function with promoter and protein expression readouts, single lab\",\n      \"pmids\": [\"19486109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKA activates and phosphorylates RORα4 at Ser-99 in vitro; CaMK-IV-triggered increases in RORα4 transcriptional activity are blocked by PKA inhibitor H89, indicating CaMKIV acts through PKA to activate RORα4.\",\n      \"method\": \"In vitro kinase assay; Ser-99 to Ala mutation of RORα4; PKA inhibitor H89; RORα4 transcriptional activity reporter assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, pharmacologic epistasis, single lab\",\n      \"pmids\": [\"21514275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IB4-binding DRG neurons express a novel 3'-UTR-extended CaMK4 mRNA isoform that is preferentially expressed in these neurons and associates with axonal localization of CaMKIV protein; in IB4+ axons, 20% of CaMKIV co-localizes with the endocytic marker Rab7 in axons co-expressing CAMKK.\",\n      \"method\": \"FISH with riboprobes; RACE and RT-PCR cDNA sequencing; quantitative PCR of FACS-sorted DRG neurons; immunohistochemical co-localization with Rab7 and CAMKK\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel transcript identified by RACE/sequencing, FISH localization, and co-localization with endosomal markers, single lab\",\n      \"pmids\": [\"23817991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CaMK4 promotes NLRP3 inflammasome activation in type II alveolar epithelial cells during LPS-induced acute lung injury; inhibition or silencing of CaMK4 reduces NLRP3 and caspase-1 activation and IL-1β production in AEC II cells.\",\n      \"method\": \"CaMK4 inhibitor KN-93 and CaMK4 siRNA in A549 cells and LPS-induced ALI mice; NLRP3/caspase-1/IL-1β measurement by Western blot and ELISA; immunofluorescence\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacologic and genetic inhibition with specific inflammasome readouts in vitro and in vivo, single lab\",\n      \"pmids\": [\"35734175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaMKIV and calcineurin A both transactivate the PGC-1α promoter in rat skeletal muscle; however, only CaMKIV (not calcineurin A) transactivates the cytochrome c promoter, demonstrating differential downstream target specificity.\",\n      \"method\": \"Gene electrotransfer of CaMKIV and calcineurin A expression vectors into rat tibialis anterior muscle; PGC-1α and cytochrome c promoter-reporter assays\",\n      \"journal\": \"Pflugers Archiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gene transfer with specific promoter reporter assays, single lab, differential target specificity established\",\n      \"pmids\": [\"17273866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TIPRL binds to CaMKK2 and causes sustained CaMKK2-CaMK4 pathway activation; CaMK4 phosphorylates CREB at Ser129 and Ser133 for maximum CREB activation; activated CREB drives transcription of TIPRL, forming a positive feedback loop; this TIPRL-CaMKK2-CaMK4-CREB axis maintains lung CSC stemness and survival.\",\n      \"method\": \"Co-IP (TIPRL-CaMKK2 interaction); phosphorylation assays (CREB Ser129/Ser133); CREB reporter assay; TIPRL depletion in vivo lung metastasis model; CaMK4 activation measurement\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, phosphorylation mapping at specific sites, in vivo validation, single lab\",\n      \"pmids\": [\"39076120\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CaMKIV (CAMK4) is a nuclear-enriched, calcium/calmodulin-activated serine/threonine kinase that is activated by CaMKK2 (phosphorylation of Thr196) and transported into the nucleus by importin-α independently of importin-β; once nuclear, CaMKIV phosphorylates and activates the transcription factor CREB (and related factors CREM-α, CREMα), driving expression of target genes (c-Fos, BDNF, IRS-2, Bcl6, tyrosine hydroxylase, glucokinase, GLUT2, ABCA1, osteopontin) critical for long-term memory consolidation, L-LTP, cerebellar LTD, Th17/Tfh cell differentiation, spermiogenesis (via protamine-2 phosphorylation), neuronal survival, and vascular tone (via eNOS); CaMKIV also phosphorylates non-transcription-factor substrates including DRP1-Ser616 (promoting mitochondrial fission), 14-3-3β (releasing synaptopodin in podocytes), Notch1-IC (protecting it from Fbw7/proteasomal degradation to enhance osteoclastogenesis), OGT (activating O-GlcNAcylation), and synapsin (regulating synaptic vesicle trafficking); it modulates the AKT/mTOR pathway (in Th17 cells and podocytes), GSK-3β/FBXW7/mTOR axis (controlling autophagy in sepsis), and cytoskeletal GTPases Rac1/RhoA (in podocytes), while caspase-3 can cleave and inactivate CaMKIV as a feedback mechanism during apoptosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CAMK4 encodes CaMKIV, a calcium/calmodulin-activated serine/threonine kinase that functions as a nuclear effector of calcium signaling, principally by phosphorylating and activating the transcription factor CREB and the related factor CREM to drive activity-dependent gene programs [#0, #9, #3]. Activation flows through an upstream CaMKK module (CaMKK2/CaMKKβ phosphorylating Thr196/200), which can be scaffolded or tuned by partner proteins such as TIPRL and DJ-1, and selective nuclear delivery of CaMKIV is achieved through direct binding to the C-terminal region of importin-α, which imports the kinase independently of importin-β [#10, #28, #40]. In neurons this nuclear CaMKIV→CREB axis is required for activity-induced c-Fos and BDNF expression and underlies long-term forms of plasticity including late-LTP, cerebellar LTD, synaptic scaling, neuronal survival, and dendritic growth downstream of TRPC6-mediated calcium entry [#0, #5, #9, #11, #27]. Beyond the nervous system, CaMKIV drives CREM/CREB-dependent transcriptional programs that govern T cell fates—suppressing IL-2 and promoting Th17 differentiation and Tfh expansion via Bcl6—linking the kinase to autoimmunity [#2, #3, #23]. CaMKIV also acts on non-transcription-factor substrates: it phosphorylates protamine-2 during spermiogenesis (and its loss causes male infertility), DRP1-Ser616 to promote mitochondrial fission during sepsis, 14-3-3β to destabilize synaptopodin and remodel podocyte actin via Rac1/RhoA, Notch1-IC to protect it from Fbw7-dependent degradation during osteoclastogenesis, OGT to enhance O-GlcNAcylation, and synapsin to regulate synaptic vesicle trafficking [#1, #17, #7, #16, #14, #19]. It additionally tunes the GSK-3β/FBXW7/mTOR axis to control autophagy and inflammatory output and is itself negatively regulated by caspase-3 and calpain-mediated proteolysis during cell death [#34, #29, #13, #33]. A de novo splice variant removing the C-terminal regulatory domain renders CaMKIV constitutively active, demonstrating that the autoregulatory domain restrains kinase output in humans [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the first defined physiological substrate and in vivo requirement for CaMKIV, showing it phosphorylates protamine-2 and is essential for the chromatin protein exchange of spermiogenesis.\",\n      \"evidence\": \"Targeted Camk4 knockout mice with in vitro kinase assay and spermatid histology\",\n      \"pmids\": [\"10932193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether protamine-2 phosphorylation is direct in vivo not fully resolved\", \"Other spermatid substrates not identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed that nuclear CaMKIV→CREB signaling is selectively required for the late, transcription-dependent phase of plasticity and memory, distinguishing it from early plasticity.\",\n      \"evidence\": \"Forebrain-restricted dominant-negative CaMKIV transgenic mice with LTP and behavioral readouts\",\n      \"pmids\": [\"11572782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific target genes downstream of CREB in memory not enumerated here\", \"Cell-type specificity within forebrain not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined CaMKIV as a bidirectional regulator of neuronal survival and identified caspase-3 cleavage as a feedback brake during apoptosis.\",\n      \"evidence\": \"Dominant-active/negative CaMKIV in cerebellar granule neurons with caspase-3 assay\",\n      \"pmids\": [\"11149901\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage site and consequence for kinase activity not fully mapped\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved how CaMKIV reaches the nucleus, showing direct importin-α binding mediates importin-β-independent nuclear import.\",\n      \"evidence\": \"Permeabilized-cell import assays, direct binding, and in vivo microinjection\",\n      \"pmids\": [\"15719015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of import by calcium/activation state not addressed\", \"Nuclear export pathway not defined here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended CaMKIV signaling beyond neurons, linking it to CREM-mediated IL-2 suppression in T cells and to lupus pathophysiology.\",\n      \"evidence\": \"Dominant-inactive CaMKIV in normal T cells with IL-2 promoter and CREM binding assays\",\n      \"pmids\": [\"15841182\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CaMKIV-CREM phosphorylation not shown here\", \"Single-lab dominant-negative approach\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated a CaMKK2→CaMKIV→CREB→BDNF cascade controlling cerebellar granule cell migration, with rescue establishing necessity of each kinase.\",\n      \"evidence\": \"CaMKK2 and CaMKIV null mice with reexpression rescue and migration/BDNF readouts\",\n      \"pmids\": [\"19605628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct kinase-substrate steps inferred from pathway epistasis\", \"BDNF autocrine loop dynamics not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified CaMK4 as a Th17-selective driver acting via CREM-α and AKT/mTOR, nominating it as an autoimmunity therapeutic target.\",\n      \"evidence\": \"CaMK4 knockout mice, pharmacologic inhibition, and human SLE T cell siRNA\",\n      \"pmids\": [\"24667640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CaMK4 substrates in the AKT/mTOR arm not pinpointed\", \"Mechanism of Th17-selective CaMK4 induction unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped a CaMKIV→GSK-3β/FBXW7→mTOR axis preserving mTOR and enabling autophagy and inflammatory cytokine output in macrophages and kidney during sepsis.\",\n      \"evidence\": \"CaMKIV null mice in LPS/CLP models with mTOR ubiquitination and GSK-3β phosphorylation assays\",\n      \"pmids\": [\"25070845\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GSK-3β is a direct CaMKIV substrate not definitively shown\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed CaMKIV directly phosphorylates and stabilizes a non-transcription-factor substrate, Notch1-IC, by blocking Fbw7-dependent degradation to promote osteoclastogenesis.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, phospho-deficient mutant, and osteoclast differentiation assays\",\n      \"pmids\": [\"23103515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation site stoichiometry in vivo not quantified\", \"Reciprocal validation of interaction limited\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a cytoplasmic CaMK4 function in podocytes, phosphorylating 14-3-3β to release/destabilize synaptopodin and remodeling Rac1/RhoA-dependent actin and motility.\",\n      \"evidence\": \"Overexpression/inhibition in podocytes with biochemical phosphorylation and targeted in vivo inhibitor delivery\",\n      \"pmids\": [\"29985166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct 14-3-3β phosphosite not specified here\", \"How CaMK4 partitions between nuclear and cytoplasmic functions unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided human genetic evidence that the C-terminal regulatory domain restrains CaMKIV, since its loss via a de novo splice variant yields constitutive activity.\",\n      \"evidence\": \"Trio exome sequencing, cDNA splicing analysis, and kinase activity in proband cells\",\n      \"pmids\": [\"30262571\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single subject; phenotype-genotype correlation limited\", \"Downstream pathway consequences in patient tissue not characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connected CaMKIV to mitochondrial dynamics, showing direct DRP1-Ser616 phosphorylation promoting fission and a role in sepsis-associated respiratory slowing and mitophagy.\",\n      \"evidence\": \"CaMK4 knockout in CLP sepsis with in vitro DRP1 phosphorylation and fission/fusion immunoblotting\",\n      \"pmids\": [\"32932146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PINK1 kinase relationship stated without full reconstitution\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established CaMK4 as a controller of Tfh expansion and humoral immunity through CREM-α-driven Bcl6 transcription, validated in mouse and human cells.\",\n      \"evidence\": \"T cell-specific knockout, immunization/autoimmunity models, and human Tfh inhibition\",\n      \"pmids\": [\"38287012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CaMK4-CREMα phosphorylation step not shown here\", \"Bcl6 enhancer-level regulation not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed a TRPC6→CaMK4→CREB axis that transcriptionally represses Acta2 to limit hepatic stellate cell activation and fibrosis, with direct promoter occupancy demonstrated.\",\n      \"evidence\": \"ChIP/luciferase for CREB-Acta2, TRPC6 manipulation, and constitutively active CREB rescue in fibrosis models\",\n      \"pmids\": [\"39887689\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CREB represses rather than activates Acta2 not detailed\", \"CaMK4 phosphosite on CREB in this context not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CaMKIV's substrate selection and subcellular partitioning are governed across its many contexts—nuclear CREB/CREM transcription versus cytoplasmic substrates (DRP1, 14-3-3β, synapsin, Notch1-IC, OGT)—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural/regulatory model explains tissue-specific substrate choice\", \"Quantitative in vivo phosphoproteome of CaMKIV not established\", \"Determinants of nuclear vs cytoplasmic activity unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 7, 16, 17, 14, 19]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 16, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 23, 32]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2, 10, 12, 33]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 25, 37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 9, 23, 32]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 27, 28, 40]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 3, 23, 31, 38]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 5, 11, 19]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [29, 34]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CAMKK2\", \"CREB1\", \"CREM\", \"KPNA (importin-alpha)\", \"NOTCH1\", \"OGT\", \"YWHAB\", \"TIPRL\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}