{"gene":"CMPK2","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2018,"finding":"CMPK2 was identified as an interferon-stimulated gene (ISG) whose knockdown via RNA interference attenuated IFN-α2b-mediated restriction of HIV in vitro, establishing a role for CMPK2 in type I IFN-mediated antiviral defense in human CD4+ T cells.","method":"RNA interference knockdown in HIV-infected cell cultures; correlation of ISG induction with plasma HIV RNA decline in vivo","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined antiviral phenotype, single lab","pmids":["30083606"],"is_preprint":false},{"year":2021,"finding":"CMPK2 (cytidine/uridine monophosphate kinase 2) localizes to mitochondria and is required for mitochondrial DNA (mtDNA) replication; its depletion reduces newly synthesized mtDNA and oxidized mtDNA (Ox-mtDNA), subsequently blocking NLRP3 inflammasome activation in macrophages/microglia.","method":"siRNA knockdown, CRISPR-Cas9 knockout, mitochondrial fractionation, measurement of mtDNA synthesis and NLRP3 inflammasome activation markers","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal KD and KO with orthogonal mechanistic readouts (mtDNA synthesis, NLRP3 activation), replicated across multiple studies","pmids":["34142025","38701781","34269108"],"is_preprint":false},{"year":2021,"finding":"CMPK2 protein is present in both mitochondrial and cytosolic cellular fractions; IFN-α-induced CMPK2 expression is inhibited by JAK1/2 and Tyk2 inhibitors, placing CMPK2 downstream of the JAK-STAT signaling pathway.","method":"Cellular subfraction analysis, Western blotting, JAK inhibitor treatment","journal":"Arthritis research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 — direct fractionation localization with pharmacological pathway placement, single lab","pmids":["33874983"],"is_preprint":false},{"year":2021,"finding":"CMPK2 knockdown and knockout suppress DENV-induced antiviral cytokine release, mitochondrial oxidative stress, and mtDNA release to the cytosol; CMPK2 depletion inhibits TLR-9 and inflammasome pathway activation. CMPK2-mediated antiviral activity occurs in both IFN-dependent and IFN-independent manners (confirmed using IFN-α receptor-KO and STAT1-KO mouse bone marrow-derived dendritic cells).","method":"siRNA knockdown, CRISPR-Cas9 KO, IFN receptor-KO and STAT1-KO mouse cells, measurement of cytokines, mtROS, TLR-9 activation, and viral production","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 — orthogonal KD and KO with multiple mechanistic readouts including genetic epistasis via receptor-KO cells","pmids":["34142025"],"is_preprint":false},{"year":2022,"finding":"Loss-of-function biallelic variants in CMPK2 cause familial brain calcification; CMPK2-deficient neurons have fewer mtDNA copies, reduced mitochondrial proteins, decreased ATP production, elevated intracellular inorganic phosphate, and impaired mitochondrial cristae architecture, linking CMPK2 to mitochondrial DNA maintenance and energy metabolism.","method":"Patient genetics, Cmpk2 knockout mice, knock-in mice bearing patient mutation, in situ hybridization, single-cell RNA-seq, mitochondrial function assays, electron microscopy","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (KO mice, knock-in mice, fractionation, EM, functional assays), strong genetic evidence from human patients","pmids":["36443312"],"is_preprint":false},{"year":2023,"finding":"CMPK2 restricts Zika virus (ZIKV) replication by specifically inhibiting viral translation; the N-terminal domain (NTD) of CMPK2, which lacks kinase activity, is sufficient for this antiviral function. Mitochondrial localization of CMPK2 is required for its antiviral effects. Seven conserved cysteine residues within the NTD are critical for antiviral activity.","method":"Overexpression, domain deletion/mutation analysis, viral replication and translation assays, mitochondrial localization experiments","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1–2 — domain mutagenesis, localization experiments, and in vitro functional assays in a single study with multiple mechanistic controls","pmids":["37075076"],"is_preprint":false},{"year":2023,"finding":"CMPK2's antiviral activity against coronaviruses (including PEDV) requires cooperation with Viperin-catalyzed ddhCTP production; both the classical catalytic domain and a newly identified antiviral key domain of CMPK2 are required for suppression of viral RNA-dependent RNA polymerase activity. CMPK2 transcription post-PEDV infection is regulated by interferon-dependent and IRF1-dependent pathways.","method":"Integrated transcriptomic analysis, overexpression, domain mutagenesis, antiviral assays, IRF1/IFN pathway analysis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1–2 — domain mutagenesis combined with functional antiviral assays and pathway validation, single rigorous study","pmids":["36930652"],"is_preprint":false},{"year":2022,"finding":"CMPK2 is required for macrophage immune homeostasis; both silencing and constitutive overexpression of CMPK2 disrupt mitochondrial membrane potential, enhance reactive oxygen species (ROS), and cause disturbed mitochondrial architecture, culminating in upregulation of pro-inflammatory genes (IL-1β, TNFα, IL-8). Long-term CMPK2 modulation increases glycolytic flux in macrophages, resembling activated M1 macrophages.","method":"siRNA knockdown, stable overexpression cell lines, mitochondrial membrane potential assays, ROS measurement, metabolic flux analysis, gene expression profiling","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional expression manipulation with orthogonal mechanistic readouts, single lab","pmids":["36451821"],"is_preprint":false},{"year":2023,"finding":"CMPK2 is a direct transcriptional target of GATA6 in endothelial cells; endothelial GATA6 deletion decreases CMPK2 expression, reducing monocyte adherence, migration, and pro-inflammatory macrophage foam cell formation through regulation of the CMPK2-NLRP3 pathway.","method":"EC-specific Gata6 knockout mouse model, AAV9-shRNA endothelial targeting, in vitro mechanistic experiments, ChIP (implied by direct target identification)","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO mice with in vivo mechanistic evidence and AAV rescue, single lab","pmids":["37339559"],"is_preprint":false},{"year":2024,"finding":"CMPK2 promotes NLRP3 inflammasome activation in ischemic stroke microglia/macrophages; microglial/macrophage-specific CMPK2 knockdown suppresses inflammatory responses, reduces infarcts, and improves neurological outcomes in CX3CR1Cre/ERT2 mice by limiting newly synthesized mtDNA and Ox-mtDNA formation.","method":"Cre-dependent AAV-mediated CMPK2 knockdown in microglia, ischemic mouse model, measurement of mtDNA synthesis, Ox-mtDNA, NLRP3 activation, infarct volume, and neurological scores","journal":"Cell reports. Medicine","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific KD with multiple mechanistic readouts (mtDNA synthesis, NLRP3 activation) and in vivo functional outcomes, replicated with pharmacological CMPK2 inhibition","pmids":["38701781"],"is_preprint":false},{"year":2021,"finding":"CBD inhibits CMPK2 expression via PPARγ (primarily) and CB1 receptor (partially), which subsequently reduces generation of oxidized mitochondrial DNA and suppresses NLRP3 inflammasome activation and pyroptosis (measured by cleaved-GSDMD and pyroptotic cell fraction).","method":"In vivo oral ulcer model, PPARγ antagonist and CB1 antagonist blockade, CMPK2 expression measurement, Ox-mtDNA quantification, NLRP3/GSDMD Western blot","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological pathway dissection in vivo with mechanistic molecular readouts, single lab","pmids":["34269108"],"is_preprint":false},{"year":2023,"finding":"Dracorhodin (DP), a natural CMPK2 inhibitor, binds CMPK2 at lysine 265 (identified by mass spectrometry-based quantitative lysine reactivity profiling and mutant tests), inhibiting CMPK2 kinase activity and suppressing LPS-induced NLRP3 inflammasome activation. The anti-sepsis effect of DP was abrogated in myeloid-specific Cmpk2 knockout mice, confirming on-target activity.","method":"Affinity MS, quantitative lysine reactivity profiling, microscale thermophoresis (Kd measurement), ADP-Glo kinase assay with recombinant CMPK2, myeloid-specific Cmpk2 KO mice, in vivo sepsis model","journal":"Clinical and translational medicine","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro enzymatic assay, direct binding Kd measurement, active site identification by MS, and genetic validation in conditional KO mice","pmids":["37859535"],"is_preprint":false},{"year":2022,"finding":"CMPK2 knockdown in spinal cord injury (SCI) rats suppresses NLRP3, ASC, caspase-1, IL-18, and IL-1β expression and improves motor function, establishing CMPK2 as an upstream regulator of NLRP3 inflammasome activation in SCI neuroinflammation.","method":"AAV-mediated CMPK2 knockdown in rat SCI model, Western blot, immunofluorescence, RT-PCR, BBB behavioral scoring","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo gene knockdown with defined functional and molecular phenotype, single lab","pmids":["35401582"],"is_preprint":false},{"year":2025,"finding":"TK2 and CMPK2 interact physically within the mitochondrial matrix (supported by proximity labeling and immunofluorescence microscopy), forming a compartmentalized two-step phosphorylation complex: TK2 phosphorylates thymidine to TMP, and CMPK2 then phosphorylates TMP to TDP, preventing TMP from diffusing away. This TK2-CMPK2 proximity prevents TMP from bypassing the sequential pathway.","method":"Proximity labeling, immunofluorescence microscopy, isolated mitochondria incubation with radiolabeled substrates, azidothymidine (TK2 blocker), broken mitochondria controls, differential fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution with isolated mitochondria, proximity labeling, and multiple orthogonal controls demonstrating direct functional interaction","pmids":["40967432"],"is_preprint":false},{"year":2025,"finding":"CMPK2 undergoes palmitoylation at cysteines 137 and 153 catalyzed by the palmitoyl transferase ZDHHC20, which maintains CMPK2 mitochondrial localization. This palmitoylation is reversed by the thioesterase PPT1. CMPK2 palmitoylation is required for ddhCTP production and MAVS stabilization, supporting IFN-I production against RNA viruses.","method":"Palmitoylation assay, ZDHHC20 overexpression/knockdown, PPT1 knockout, site-directed mutagenesis of C137 and C153, mitochondrial localization imaging, ddhCTP measurement, MAVS interaction assay, antiviral assays","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1–2 — PTM writer/eraser identified with site-specific mutagenesis, localization consequence, and downstream functional validation","pmids":["42011944"],"is_preprint":false},{"year":2025,"finding":"CMPK2 promotes microglial activation and neuroinflammation through the cGAS-STING signaling pathway; CMPK2 overexpression elevates cGAS and STING expression, ROS, and pro-inflammatory cytokines, while cGAS knockdown reverses these effects. Molecular docking supports direct protein-level binding between CMPK2 and cGAS.","method":"LPS-treated BV2 and primary microglial cells, CMPK2 overexpression, cGAS siRNA knockdown, cytokine measurement, molecular docking","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 — functional rescue experiment and molecular docking; binding is computational, single lab","pmids":["40189684"],"is_preprint":false},{"year":2025,"finding":"CMPK2 exacerbates neuropathic pain by promoting microglial glycolysis, increasing lactate production that induces lactylation and deactivation of STING, thereby suppressing IFN-I production. The transcription factor RUNX1 promotes CMPK2 upregulation in microglia.","method":"mRNA microarray, in vivo Cmpk2 deficiency mouse model, in vitro CMPK2 overexpression in microglia, glycolysis and lactate measurement, STING lactylation detection, pain behavioral assays","journal":"Brain, behavior, and immunity","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KO with mechanistic dissection including PTM (lactylation) identification, single lab","pmids":["40252934"],"is_preprint":false},{"year":2024,"finding":"The FTO (m6A demethylase)-CMPK2 pathway regulates synovial inflammation in rheumatoid arthritis through mtDNA-mediated cGAS/STING pathway activation; FTO inhibition reduces CMPK2 expression in fibroblast-like synoviocytes.","method":"FTO inhibition and gene knockdown (in vitro/in vivo), CMPK2 expression analysis, cGAS/STING pathway markers, chondrocyte functional assays","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 3 — pathway placement via inhibitor and knockdown studies, single lab, indirect evidence for FTO-CMPK2 axis","pmids":["38481810"],"is_preprint":false},{"year":2025,"finding":"STAT2 directly binds the Cmpk2 promoter (ChIP assay) and drives LPS-induced CMPK2 transcription; diosgenin interacts with STAT2 at Pro630 and Lys689 (surface plasmon resonance), selectively suppressing STAT2 phosphorylation and CMPK2-mediated mtDNA synthesis and mtROS production in macrophages.","method":"ChIP assay, Stat2 knockdown/overexpression, surface plasmon resonance, CMPK2 expression and mtDNA synthesis measurement, colitis mouse model","journal":"Phytomedicine","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP confirms direct promoter binding, SPR confirms small molecule-STAT2 interaction, rescued by overexpression","pmids":["41351988"],"is_preprint":false},{"year":2025,"finding":"TRIM7, an E3 ubiquitin ligase, interacts with CMPK2 and negatively regulates its expression; inhibition of CMPK2 reverses the increased inflammation and apoptosis seen in renal epithelial cells lacking TRIM7, establishing TRIM7 as a negative regulator of CMPK2 in renal ischemia-reperfusion injury.","method":"Co-IP (TRIM7-CMPK2 interaction), TRIM7 overexpression/knockout in vivo and in vitro, CMPK2 inhibition rescue experiment, inflammation and apoptosis assays","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP interaction plus functional rescue, single lab","pmids":["41723894"],"is_preprint":false},{"year":2019,"finding":"Fish CMPK2 localizes to the cytoplasm of FHM cells (indirect immunofluorescence) and functions as an interferon-stimulated gene; overexpression reduces SVCV replication while RNAi knockdown increases it, demonstrating antiviral activity consistent with its mammalian ortholog.","method":"Indirect immunofluorescence (localization), overexpression and RNAi knockdown in SVCV-infected FHM cells, qRT-PCR, IFN1/IFN3 induction assays","journal":"Fish & shellfish immunology","confidence":"Low","confidence_rationale":"Tier 3 — fish ortholog, single lab, localization and basic overexpression/KD","pmids":["31125665"],"is_preprint":false},{"year":2022,"finding":"Chicken CMPK2 (chCMPK2) is regulated by the MDA5/IFN-β pathway and exerts antiviral activity against AIV and NDV; Asp135 in the thymidylate kinase (TMK) catalytic domain is critical for antiviral activity.","method":"MDA5 and IFN-β knockdown cells, chCMPK2 overexpression, Asp135 site-directed mutagenesis, viral replication assays","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2 — active-site mutagenesis combined with pathway knockdown and antiviral assays; vertebrate ortholog with conserved domain","pmids":["35633731"],"is_preprint":false},{"year":2025,"finding":"DEL-1 inhibits Cmpk2-dependent mtDNA synthesis, thereby inhibiting the cGAS-STING pathway to ameliorate intestinal inflammation; the transcription factor Spi1 regulates Cmpk2 transcription, and overexpression of Spi1 or Cmpk2, or STING agonism, reverses DEL-1's protective effects.","method":"DEL-1 overexpression and AAV knockdown in colitis mice, RNA-Seq, ChIP (Spi1-Cmpk2 promoter), dual-luciferase reporter assay, STING agonist rescue","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay identify Spi1 as transcription factor for Cmpk2, plus in vivo mechanistic rescue experiments","pmids":["40288675"],"is_preprint":false},{"year":2025,"finding":"Cmpk2 deficiency impairs neutrophil phagocytosis of bacteria and reduces host survival during bacterial infection; the protective effect of Cmpk2 in neutrophils is STING-dependent (differences between WT and Cmpk2 KO were eliminated by a STING inhibitor C176).","method":"Cmpk2 global KO mice, flow cytometry phagocytosis assay, STING inhibitor C176, zebrafish bacterial infection model, scRNA-seq for cell-type expression","journal":"Lung","confidence":"Medium","confidence_rationale":"Tier 2 — KO mice with pharmacological epistasis (STING inhibitor) and in vivo functional outcomes, single lab","pmids":["40616692"],"is_preprint":false}],"current_model":"CMPK2 is a mitochondrially localized UMP/CMP kinase that phosphorylates nucleoside monophosphates to supply substrates for mtDNA synthesis; it functions downstream of IFN/JAK-STAT signaling (induced by type I IFNs via JAK1/2-Tyk2), physically associates with TK2 in a compartmentalized mtDNA nucleotide salvage complex, and drives inflammatory signaling through the NLRP3 inflammasome and cGAS-STING pathway by promoting mtDNA replication and release of oxidized mtDNA; its antiviral activity against flaviviruses and coronaviruses involves the NTD (kinase-independent) and requires mitochondrial localization maintained by ZDHHC20-mediated palmitoylation at C137/C153, while its expression is transcriptionally controlled by STAT2, Spi1/PU.1, RUNX1, and GATA6 depending on cellular context."},"narrative":{"teleology":[{"year":2018,"claim":"Establishing CMPK2 as an interferon-stimulated gene with antiviral function resolved its initial biological context as a component of type I IFN-mediated host defense.","evidence":"siRNA knockdown attenuated IFN-α2b-mediated HIV restriction in human CD4+ T cells","pmids":["30083606"],"confidence":"Medium","gaps":["Mechanism of antiviral action unresolved","Not yet linked to mtDNA or inflammasome biology","Single-virus/single-cell-type system"]},{"year":2021,"claim":"Demonstrating that CMPK2 localizes to mitochondria, drives mtDNA synthesis, and is required for NLRP3 inflammasome activation established the central mechanistic link between its kinase activity, mtDNA replication, and inflammatory signaling.","evidence":"siRNA knockdown and CRISPR-KO in macrophages/microglia with measurement of newly synthesized mtDNA, Ox-mtDNA, and NLRP3 activation; JAK inhibitor studies and subcellular fractionation confirmed dual localization and JAK-STAT pathway dependence","pmids":["34142025","33874983","34269108"],"confidence":"High","gaps":["Direct enzymatic substrate specificity in mitochondria not reconstituted","Whether cytosolic pool has independent function unclear","Structural basis of CMPK2-NLRP3 axis unknown"]},{"year":2022,"claim":"Bidirectional perturbation of CMPK2 in macrophages—both silencing and constitutive overexpression—disrupted mitochondrial homeostasis and shifted metabolism toward glycolysis, revealing that tightly regulated CMPK2 expression is essential for macrophage immune homeostasis.","evidence":"siRNA knockdown and stable overexpression in macrophage lines with mitochondrial membrane potential, ROS, and metabolic flux readouts","pmids":["36451821"],"confidence":"Medium","gaps":["Dose–response relationship for CMPK2 activity not quantified","Glycolytic shift mechanism not fully delineated"]},{"year":2022,"claim":"Identification of a natural CMPK2 inhibitor (Dracorhodin) that binds Lys265, combined with validation in myeloid-specific Cmpk2-KO mice, provided the first direct enzymatic activity measurement and on-target pharmacological confirmation in vivo.","evidence":"ADP-Glo kinase assay with recombinant CMPK2, MS-based lysine reactivity profiling, microscale thermophoresis Kd, myeloid-specific Cmpk2-KO mouse sepsis model","pmids":["37859535"],"confidence":"High","gaps":["Crystal structure of CMPK2 with inhibitor not solved","Selectivity over CMPK1 not fully profiled"]},{"year":2022,"claim":"Human genetic evidence that biallelic CMPK2 loss-of-function variants cause familial brain calcification, with corresponding mtDNA depletion and mitochondrial structural defects in knock-in mice, demonstrated a non-redundant physiological role for CMPK2 in neuronal mitochondrial maintenance.","evidence":"Patient genetics, Cmpk2-KO and patient-mutation knock-in mice, electron microscopy, mitochondrial functional assays, single-cell RNA-seq","pmids":["36443312"],"confidence":"High","gaps":["Mechanism linking mtDNA depletion to brain calcification not resolved","Cell-type specificity of vulnerability (neurons vs. glia) incompletely defined"]},{"year":2023,"claim":"Domain dissection revealed that the kinase-independent N-terminal domain is sufficient to restrict Zika virus translation, while cooperation with Viperin-derived ddhCTP through both the catalytic and a novel antiviral key domain is required for coronavirus restriction, bifurcating CMPK2's antiviral mechanisms.","evidence":"Overexpression of truncated/mutated CMPK2 constructs in flavivirus and coronavirus infection systems; viral translation and RdRp activity assays","pmids":["37075076","36930652"],"confidence":"High","gaps":["NTD target on the ribosome/viral RNA unknown","ddhCTP phosphorylation by CMPK2 not directly demonstrated with purified enzyme","Whether NTD and catalytic antiviral arms are additive or independent in mixed infections unclear"]},{"year":2024,"claim":"Cell-type-specific CMPK2 knockdown in microglia reduced infarct volume and improved neurological outcomes after ischemic stroke, translating the CMPK2–mtDNA–NLRP3 axis into a disease-relevant in vivo therapeutic target.","evidence":"Cre-dependent AAV-mediated CMPK2 knockdown in CX3CR1Cre/ERT2 mice, ischemic stroke model with pharmacological CMPK2 inhibition replication","pmids":["38701781"],"confidence":"High","gaps":["Long-term safety of CMPK2 inhibition in the brain not assessed","Whether peripheral CMPK2 inhibition contributes unclear"]},{"year":2025,"claim":"Discovery that ZDHHC20-mediated palmitoylation at C137/C153 maintains CMPK2 mitochondrial localization, and that this modification is required for ddhCTP production and MAVS stabilization, revealed a post-translational regulatory switch controlling both metabolic and antiviral outputs.","evidence":"Palmitoylation assays, ZDHHC20 overexpression/knockdown, PPT1-KO, C137A/C153A mutagenesis, mitochondrial localization imaging, ddhCTP and MAVS interaction assays","pmids":["42011944"],"confidence":"High","gaps":["Dynamics of palmitoylation cycling during infection unknown","Whether other palmitoyltransferases contribute not excluded"]},{"year":2025,"claim":"Proximity labeling and reconstitution in isolated mitochondria showed TK2 and CMPK2 form a compartmentalized phosphorylation complex in the mitochondrial matrix, channeling TMP to TDP without diffusion, establishing the biochemical logic of mitochondrial nucleotide salvage.","evidence":"Proximity labeling, immunofluorescence, isolated mitochondria incubation with radiolabeled substrates, azidothymidine blockade, broken-mitochondria controls","pmids":["40967432"],"confidence":"High","gaps":["Stoichiometry and structural basis of TK2-CMPK2 complex not determined","Whether CMPK2 also channels CMP/UMP phosphorylation in vivo not tested"]},{"year":2025,"claim":"Multiple transcription factors—STAT2, Spi1/PU.1, RUNX1, and GATA6—were shown to directly regulate CMPK2 transcription in distinct cellular contexts, revealing a multi-layered transcriptional control architecture for this gene.","evidence":"ChIP and dual-luciferase assays (STAT2 in macrophages, Spi1 in colitis model), conditional Gata6-KO endothelial mice, RUNX1 identification in microglia","pmids":["41351988","40288675","37339559","40252934"],"confidence":"Medium","gaps":["Epigenetic regulation and chromatin accessibility at the CMPK2 locus not characterized","Relative contribution of each TF in a single cell type not compared","RUNX1 binding to CMPK2 promoter not confirmed by ChIP"]},{"year":2025,"claim":"CMPK2 activates the cGAS-STING pathway via mtDNA release and is required for neutrophil bactericidal function through a STING-dependent mechanism, extending its innate immune role beyond inflammasome activation.","evidence":"CMPK2 overexpression/cGAS knockdown epistasis in microglia; Cmpk2-KO mice with STING inhibitor C176 in bacterial infection and phagocytosis assays","pmids":["40189684","40616692"],"confidence":"Medium","gaps":["Direct CMPK2-cGAS physical interaction awaits validation beyond molecular docking","Relative importance of NLRP3 vs. cGAS-STING downstream of CMPK2 in different infections not quantified"]},{"year":null,"claim":"Key unresolved questions include the atomic structure of CMPK2 and its complexes, the precise mechanism by which the NTD blocks viral translation, whether cytosolic CMPK2 has functions independent of mitochondrial localization, and how palmitoylation dynamics integrate metabolic and antiviral outputs during infection.","evidence":"Open questions from current literature","pmids":[],"confidence":"Medium","gaps":["No crystal or cryo-EM structure of CMPK2","NTD antiviral target not identified","Cytosolic CMPK2 function undefined","In vivo palmitoylation dynamics uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,4,11,13]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[4,11,13]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1,2,4,5,13,14]}],"pathway":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,3,6,9,14,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,8,15,17]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4,7,13]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,10,11]}],"complexes":["TK2-CMPK2 mitochondrial nucleotide salvage complex"],"partners":["TK2","ZDHHC20","PPT1","NLRP3","TRIM7","VIPERIN","MAVS"],"other_free_text":[]},"mechanistic_narrative":"CMPK2 is a mitochondrially localized nucleoside monophosphate kinase that couples mitochondrial DNA maintenance to innate immune signaling. Within the mitochondrial matrix, CMPK2 physically associates with TK2 in a compartmentalized two-step phosphorylation complex that channels thymidine monophosphate to the diphosphate form, sustaining mtDNA replication [PMID:40967432]; its depletion reduces mtDNA copy number, impairs mitochondrial cristae architecture, and diminishes ATP production, and biallelic loss-of-function variants cause familial brain calcification [PMID:36443312]. CMPK2 is an interferon-stimulated gene induced through JAK-STAT signaling and STAT2 promoter binding [PMID:33874983, PMID:41351988]; by driving mtDNA synthesis it generates oxidized mtDNA that activates both the NLRP3 inflammasome and cGAS-STING pathways in macrophages and microglia [PMID:34142025, PMID:38701781, PMID:40189684]. Independent of its kinase activity, the palmitoylated N-terminal domain—maintained at mitochondria by ZDHHC20-mediated palmitoylation at C137/C153—restricts flavivirus and coronavirus replication by inhibiting viral translation and cooperating with Viperin-derived ddhCTP to suppress viral RNA-dependent RNA polymerase activity [PMID:37075076, PMID:36930652, PMID:42011944]."},"prefetch_data":{"uniprot":{"accession":"Q5EBM0","full_name":"UMP-CMP kinase 2, mitochondrial","aliases":["Nucleoside-diphosphate kinase"],"length_aa":449,"mass_kda":49.4,"function":"Mitochondrial nucleotide monophosphate kinase needed for salvage dNTP synthesis that mediates immunomodulatory and antiviral activities through IFN-dependent and IFN-independent pathways (PubMed:17999954, PubMed:30083606, PubMed:36930652, PubMed:37075076). Restricts the replication of multiple viruses including flaviviruses or coronaviruses (PubMed:30083606, PubMed:36930652, PubMed:37075076). Together with viperin/RSAD2 and ddhCTP, suppresses the replication of several coronaviruses through inhibition of the viral RNA-dependent RNA polymerase activities (PubMed:36930652). Concerning flaviviruses, restricts RNA translation when localized to the mitochondria independently of its kinase activity (PubMed:37075076). Is able to phosphorylate dUMP, dCMP, CMP, UMP and monophosphates of the pyrimidine nucleoside analogs ddC, dFdC, araC, BVDU and FdUrd with ATP as phosphate donor. Efficacy is highest for dUMP followed by dCMP while CMP and UMP are poor substrates. Controls therefore mitochondrial DNA synthesis by supplying required deoxyribonucleotides (By similarity). CMPK2-dependent mitochondrial DNA synthesis is necessary for the production of oxidized mitochondrial DNA fragments after exposure to NLRP3 activators (By similarity). In turn, cytosolic oxidized mtDNA associates with the NLRP3 inflammasome complex and is required for its activation (By similarity)","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q5EBM0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CMPK2","classification":"Not Classified","n_dependent_lines":11,"n_total_lines":1208,"dependency_fraction":0.009105960264900662},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CMPK2","total_profiled":1310},"omim":[{"mim_id":"621018","title":"BASAL GANGLIA CALCIFICATION, IDIOPATHIC, 10, AUTOSOMAL RECESSIVE; IBGC10","url":"https://www.omim.org/entry/621018"},{"mim_id":"620418","title":"NEGATIVE REGULATOR OF INTERFERON RESPONSE, NONCODING; NRIR","url":"https://www.omim.org/entry/620418"},{"mim_id":"619219","title":"CHROMOSOME 2 OPEN READING FRAME 69; C2ORF69","url":"https://www.omim.org/entry/619219"},{"mim_id":"611787","title":"CYTIDINE MONOPHOSPHATE (UMP-CMP) KINASE 2, MITOCHONDRIAL; CMPK2","url":"https://www.omim.org/entry/611787"},{"mim_id":"606416","title":"NLR FAMILY, PYRIN DOMAIN-CONTAINING 3; NLRP3","url":"https://www.omim.org/entry/606416"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":6.1},{"tissue":"salivary gland","ntpm":8.0}],"url":"https://www.proteinatlas.org/search/CMPK2"},"hgnc":{"alias_symbol":["TYKi","UMP-CMPK2","NDK"],"prev_symbol":[]},"alphafold":{"accession":"Q5EBM0","domains":[{"cath_id":"-","chopping":"32-51_59-195","consensus_level":"high","plddt":87.2536,"start":32,"end":195},{"cath_id":"3.40.50.300","chopping":"205-448","consensus_level":"high","plddt":93.6277,"start":205,"end":448}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5EBM0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5EBM0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5EBM0-F1-predicted_aligned_error_v6.png","plddt_mean":86.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CMPK2","jax_strain_url":"https://www.jax.org/strain/search?query=CMPK2"},"sequence":{"accession":"Q5EBM0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5EBM0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5EBM0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5EBM0"}},"corpus_meta":[{"pmid":"9420253","id":"PMC_9420253","title":"Spontaneous mutations in the env gene of the human immunodeficiency virus type 1 NDK isolate are associated with a CD4-independent entry phenotype.","date":"1998","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/9420253","citation_count":147,"is_preprint":false},{"pmid":"38701781","id":"PMC_38701781","title":"Microglial CMPK2 promotes neuroinflammation and brain injury after ischemic stroke.","date":"2024","source":"Cell reports. 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correlation of ISG induction with plasma HIV RNA decline in vivo\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined antiviral phenotype, single lab\",\n      \"pmids\": [\"30083606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CMPK2 (cytidine/uridine monophosphate kinase 2) localizes to mitochondria and is required for mitochondrial DNA (mtDNA) replication; its depletion reduces newly synthesized mtDNA and oxidized mtDNA (Ox-mtDNA), subsequently blocking NLRP3 inflammasome activation in macrophages/microglia.\",\n      \"method\": \"siRNA knockdown, CRISPR-Cas9 knockout, mitochondrial fractionation, measurement of mtDNA synthesis and NLRP3 inflammasome activation markers\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal KD and KO with orthogonal mechanistic readouts (mtDNA synthesis, NLRP3 activation), replicated across multiple studies\",\n      \"pmids\": [\"34142025\", \"38701781\", \"34269108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CMPK2 protein is present in both mitochondrial and cytosolic cellular fractions; IFN-α-induced CMPK2 expression is inhibited by JAK1/2 and Tyk2 inhibitors, placing CMPK2 downstream of the JAK-STAT signaling pathway.\",\n      \"method\": \"Cellular subfraction analysis, Western blotting, JAK inhibitor treatment\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct fractionation localization with pharmacological pathway placement, single lab\",\n      \"pmids\": [\"33874983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CMPK2 knockdown and knockout suppress DENV-induced antiviral cytokine release, mitochondrial oxidative stress, and mtDNA release to the cytosol; CMPK2 depletion inhibits TLR-9 and inflammasome pathway activation. CMPK2-mediated antiviral activity occurs in both IFN-dependent and IFN-independent manners (confirmed using IFN-α receptor-KO and STAT1-KO mouse bone marrow-derived dendritic cells).\",\n      \"method\": \"siRNA knockdown, CRISPR-Cas9 KO, IFN receptor-KO and STAT1-KO mouse cells, measurement of cytokines, mtROS, TLR-9 activation, and viral production\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — orthogonal KD and KO with multiple mechanistic readouts including genetic epistasis via receptor-KO cells\",\n      \"pmids\": [\"34142025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss-of-function biallelic variants in CMPK2 cause familial brain calcification; CMPK2-deficient neurons have fewer mtDNA copies, reduced mitochondrial proteins, decreased ATP production, elevated intracellular inorganic phosphate, and impaired mitochondrial cristae architecture, linking CMPK2 to mitochondrial DNA maintenance and energy metabolism.\",\n      \"method\": \"Patient genetics, Cmpk2 knockout mice, knock-in mice bearing patient mutation, in situ hybridization, single-cell RNA-seq, mitochondrial function assays, electron microscopy\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (KO mice, knock-in mice, fractionation, EM, functional assays), strong genetic evidence from human patients\",\n      \"pmids\": [\"36443312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CMPK2 restricts Zika virus (ZIKV) replication by specifically inhibiting viral translation; the N-terminal domain (NTD) of CMPK2, which lacks kinase activity, is sufficient for this antiviral function. Mitochondrial localization of CMPK2 is required for its antiviral effects. Seven conserved cysteine residues within the NTD are critical for antiviral activity.\",\n      \"method\": \"Overexpression, domain deletion/mutation analysis, viral replication and translation assays, mitochondrial localization experiments\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — domain mutagenesis, localization experiments, and in vitro functional assays in a single study with multiple mechanistic controls\",\n      \"pmids\": [\"37075076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CMPK2's antiviral activity against coronaviruses (including PEDV) requires cooperation with Viperin-catalyzed ddhCTP production; both the classical catalytic domain and a newly identified antiviral key domain of CMPK2 are required for suppression of viral RNA-dependent RNA polymerase activity. CMPK2 transcription post-PEDV infection is regulated by interferon-dependent and IRF1-dependent pathways.\",\n      \"method\": \"Integrated transcriptomic analysis, overexpression, domain mutagenesis, antiviral assays, IRF1/IFN pathway analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — domain mutagenesis combined with functional antiviral assays and pathway validation, single rigorous study\",\n      \"pmids\": [\"36930652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CMPK2 is required for macrophage immune homeostasis; both silencing and constitutive overexpression of CMPK2 disrupt mitochondrial membrane potential, enhance reactive oxygen species (ROS), and cause disturbed mitochondrial architecture, culminating in upregulation of pro-inflammatory genes (IL-1β, TNFα, IL-8). Long-term CMPK2 modulation increases glycolytic flux in macrophages, resembling activated M1 macrophages.\",\n      \"method\": \"siRNA knockdown, stable overexpression cell lines, mitochondrial membrane potential assays, ROS measurement, metabolic flux analysis, gene expression profiling\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional expression manipulation with orthogonal mechanistic readouts, single lab\",\n      \"pmids\": [\"36451821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CMPK2 is a direct transcriptional target of GATA6 in endothelial cells; endothelial GATA6 deletion decreases CMPK2 expression, reducing monocyte adherence, migration, and pro-inflammatory macrophage foam cell formation through regulation of the CMPK2-NLRP3 pathway.\",\n      \"method\": \"EC-specific Gata6 knockout mouse model, AAV9-shRNA endothelial targeting, in vitro mechanistic experiments, ChIP (implied by direct target identification)\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mice with in vivo mechanistic evidence and AAV rescue, single lab\",\n      \"pmids\": [\"37339559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CMPK2 promotes NLRP3 inflammasome activation in ischemic stroke microglia/macrophages; microglial/macrophage-specific CMPK2 knockdown suppresses inflammatory responses, reduces infarcts, and improves neurological outcomes in CX3CR1Cre/ERT2 mice by limiting newly synthesized mtDNA and Ox-mtDNA formation.\",\n      \"method\": \"Cre-dependent AAV-mediated CMPK2 knockdown in microglia, ischemic mouse model, measurement of mtDNA synthesis, Ox-mtDNA, NLRP3 activation, infarct volume, and neurological scores\",\n      \"journal\": \"Cell reports. Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KD with multiple mechanistic readouts (mtDNA synthesis, NLRP3 activation) and in vivo functional outcomes, replicated with pharmacological CMPK2 inhibition\",\n      \"pmids\": [\"38701781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CBD inhibits CMPK2 expression via PPARγ (primarily) and CB1 receptor (partially), which subsequently reduces generation of oxidized mitochondrial DNA and suppresses NLRP3 inflammasome activation and pyroptosis (measured by cleaved-GSDMD and pyroptotic cell fraction).\",\n      \"method\": \"In vivo oral ulcer model, PPARγ antagonist and CB1 antagonist blockade, CMPK2 expression measurement, Ox-mtDNA quantification, NLRP3/GSDMD Western blot\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological pathway dissection in vivo with mechanistic molecular readouts, single lab\",\n      \"pmids\": [\"34269108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Dracorhodin (DP), a natural CMPK2 inhibitor, binds CMPK2 at lysine 265 (identified by mass spectrometry-based quantitative lysine reactivity profiling and mutant tests), inhibiting CMPK2 kinase activity and suppressing LPS-induced NLRP3 inflammasome activation. The anti-sepsis effect of DP was abrogated in myeloid-specific Cmpk2 knockout mice, confirming on-target activity.\",\n      \"method\": \"Affinity MS, quantitative lysine reactivity profiling, microscale thermophoresis (Kd measurement), ADP-Glo kinase assay with recombinant CMPK2, myeloid-specific Cmpk2 KO mice, in vivo sepsis model\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro enzymatic assay, direct binding Kd measurement, active site identification by MS, and genetic validation in conditional KO mice\",\n      \"pmids\": [\"37859535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CMPK2 knockdown in spinal cord injury (SCI) rats suppresses NLRP3, ASC, caspase-1, IL-18, and IL-1β expression and improves motor function, establishing CMPK2 as an upstream regulator of NLRP3 inflammasome activation in SCI neuroinflammation.\",\n      \"method\": \"AAV-mediated CMPK2 knockdown in rat SCI model, Western blot, immunofluorescence, RT-PCR, BBB behavioral scoring\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gene knockdown with defined functional and molecular phenotype, single lab\",\n      \"pmids\": [\"35401582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TK2 and CMPK2 interact physically within the mitochondrial matrix (supported by proximity labeling and immunofluorescence microscopy), forming a compartmentalized two-step phosphorylation complex: TK2 phosphorylates thymidine to TMP, and CMPK2 then phosphorylates TMP to TDP, preventing TMP from diffusing away. This TK2-CMPK2 proximity prevents TMP from bypassing the sequential pathway.\",\n      \"method\": \"Proximity labeling, immunofluorescence microscopy, isolated mitochondria incubation with radiolabeled substrates, azidothymidine (TK2 blocker), broken mitochondria controls, differential fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution with isolated mitochondria, proximity labeling, and multiple orthogonal controls demonstrating direct functional interaction\",\n      \"pmids\": [\"40967432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 undergoes palmitoylation at cysteines 137 and 153 catalyzed by the palmitoyl transferase ZDHHC20, which maintains CMPK2 mitochondrial localization. This palmitoylation is reversed by the thioesterase PPT1. CMPK2 palmitoylation is required for ddhCTP production and MAVS stabilization, supporting IFN-I production against RNA viruses.\",\n      \"method\": \"Palmitoylation assay, ZDHHC20 overexpression/knockdown, PPT1 knockout, site-directed mutagenesis of C137 and C153, mitochondrial localization imaging, ddhCTP measurement, MAVS interaction assay, antiviral assays\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — PTM writer/eraser identified with site-specific mutagenesis, localization consequence, and downstream functional validation\",\n      \"pmids\": [\"42011944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 promotes microglial activation and neuroinflammation through the cGAS-STING signaling pathway; CMPK2 overexpression elevates cGAS and STING expression, ROS, and pro-inflammatory cytokines, while cGAS knockdown reverses these effects. Molecular docking supports direct protein-level binding between CMPK2 and cGAS.\",\n      \"method\": \"LPS-treated BV2 and primary microglial cells, CMPK2 overexpression, cGAS siRNA knockdown, cytokine measurement, molecular docking\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional rescue experiment and molecular docking; binding is computational, single lab\",\n      \"pmids\": [\"40189684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 exacerbates neuropathic pain by promoting microglial glycolysis, increasing lactate production that induces lactylation and deactivation of STING, thereby suppressing IFN-I production. The transcription factor RUNX1 promotes CMPK2 upregulation in microglia.\",\n      \"method\": \"mRNA microarray, in vivo Cmpk2 deficiency mouse model, in vitro CMPK2 overexpression in microglia, glycolysis and lactate measurement, STING lactylation detection, pain behavioral assays\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with mechanistic dissection including PTM (lactylation) identification, single lab\",\n      \"pmids\": [\"40252934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The FTO (m6A demethylase)-CMPK2 pathway regulates synovial inflammation in rheumatoid arthritis through mtDNA-mediated cGAS/STING pathway activation; FTO inhibition reduces CMPK2 expression in fibroblast-like synoviocytes.\",\n      \"method\": \"FTO inhibition and gene knockdown (in vitro/in vivo), CMPK2 expression analysis, cGAS/STING pathway markers, chondrocyte functional assays\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway placement via inhibitor and knockdown studies, single lab, indirect evidence for FTO-CMPK2 axis\",\n      \"pmids\": [\"38481810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAT2 directly binds the Cmpk2 promoter (ChIP assay) and drives LPS-induced CMPK2 transcription; diosgenin interacts with STAT2 at Pro630 and Lys689 (surface plasmon resonance), selectively suppressing STAT2 phosphorylation and CMPK2-mediated mtDNA synthesis and mtROS production in macrophages.\",\n      \"method\": \"ChIP assay, Stat2 knockdown/overexpression, surface plasmon resonance, CMPK2 expression and mtDNA synthesis measurement, colitis mouse model\",\n      \"journal\": \"Phytomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirms direct promoter binding, SPR confirms small molecule-STAT2 interaction, rescued by overexpression\",\n      \"pmids\": [\"41351988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM7, an E3 ubiquitin ligase, interacts with CMPK2 and negatively regulates its expression; inhibition of CMPK2 reverses the increased inflammation and apoptosis seen in renal epithelial cells lacking TRIM7, establishing TRIM7 as a negative regulator of CMPK2 in renal ischemia-reperfusion injury.\",\n      \"method\": \"Co-IP (TRIM7-CMPK2 interaction), TRIM7 overexpression/knockout in vivo and in vitro, CMPK2 inhibition rescue experiment, inflammation and apoptosis assays\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP interaction plus functional rescue, single lab\",\n      \"pmids\": [\"41723894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Fish CMPK2 localizes to the cytoplasm of FHM cells (indirect immunofluorescence) and functions as an interferon-stimulated gene; overexpression reduces SVCV replication while RNAi knockdown increases it, demonstrating antiviral activity consistent with its mammalian ortholog.\",\n      \"method\": \"Indirect immunofluorescence (localization), overexpression and RNAi knockdown in SVCV-infected FHM cells, qRT-PCR, IFN1/IFN3 induction assays\",\n      \"journal\": \"Fish & shellfish immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — fish ortholog, single lab, localization and basic overexpression/KD\",\n      \"pmids\": [\"31125665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Chicken CMPK2 (chCMPK2) is regulated by the MDA5/IFN-β pathway and exerts antiviral activity against AIV and NDV; Asp135 in the thymidylate kinase (TMK) catalytic domain is critical for antiviral activity.\",\n      \"method\": \"MDA5 and IFN-β knockdown cells, chCMPK2 overexpression, Asp135 site-directed mutagenesis, viral replication assays\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — active-site mutagenesis combined with pathway knockdown and antiviral assays; vertebrate ortholog with conserved domain\",\n      \"pmids\": [\"35633731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DEL-1 inhibits Cmpk2-dependent mtDNA synthesis, thereby inhibiting the cGAS-STING pathway to ameliorate intestinal inflammation; the transcription factor Spi1 regulates Cmpk2 transcription, and overexpression of Spi1 or Cmpk2, or STING agonism, reverses DEL-1's protective effects.\",\n      \"method\": \"DEL-1 overexpression and AAV knockdown in colitis mice, RNA-Seq, ChIP (Spi1-Cmpk2 promoter), dual-luciferase reporter assay, STING agonist rescue\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay identify Spi1 as transcription factor for Cmpk2, plus in vivo mechanistic rescue experiments\",\n      \"pmids\": [\"40288675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cmpk2 deficiency impairs neutrophil phagocytosis of bacteria and reduces host survival during bacterial infection; the protective effect of Cmpk2 in neutrophils is STING-dependent (differences between WT and Cmpk2 KO were eliminated by a STING inhibitor C176).\",\n      \"method\": \"Cmpk2 global KO mice, flow cytometry phagocytosis assay, STING inhibitor C176, zebrafish bacterial infection model, scRNA-seq for cell-type expression\",\n      \"journal\": \"Lung\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mice with pharmacological epistasis (STING inhibitor) and in vivo functional outcomes, single lab\",\n      \"pmids\": [\"40616692\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CMPK2 is a mitochondrially localized UMP/CMP kinase that phosphorylates nucleoside monophosphates to supply substrates for mtDNA synthesis; it functions downstream of IFN/JAK-STAT signaling (induced by type I IFNs via JAK1/2-Tyk2), physically associates with TK2 in a compartmentalized mtDNA nucleotide salvage complex, and drives inflammatory signaling through the NLRP3 inflammasome and cGAS-STING pathway by promoting mtDNA replication and release of oxidized mtDNA; its antiviral activity against flaviviruses and coronaviruses involves the NTD (kinase-independent) and requires mitochondrial localization maintained by ZDHHC20-mediated palmitoylation at C137/C153, while its expression is transcriptionally controlled by STAT2, Spi1/PU.1, RUNX1, and GATA6 depending on cellular context.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CMPK2 is a mitochondrially localized nucleoside monophosphate kinase that couples mitochondrial DNA maintenance to innate immune signaling. Within the mitochondrial matrix, CMPK2 physically associates with TK2 in a compartmentalized two-step phosphorylation complex that channels thymidine monophosphate to the diphosphate form, sustaining mtDNA replication [PMID:40967432]; its depletion reduces mtDNA copy number, impairs mitochondrial cristae architecture, and diminishes ATP production, and biallelic loss-of-function variants cause familial brain calcification [PMID:36443312]. CMPK2 is an interferon-stimulated gene induced through JAK-STAT signaling and STAT2 promoter binding [PMID:33874983, PMID:41351988]; by driving mtDNA synthesis it generates oxidized mtDNA that activates both the NLRP3 inflammasome and cGAS-STING pathways in macrophages and microglia [PMID:34142025, PMID:38701781, PMID:40189684]. Independent of its kinase activity, the palmitoylated N-terminal domain—maintained at mitochondria by ZDHHC20-mediated palmitoylation at C137/C153—restricts flavivirus and coronavirus replication by inhibiting viral translation and cooperating with Viperin-derived ddhCTP to suppress viral RNA-dependent RNA polymerase activity [PMID:37075076, PMID:36930652, PMID:42011944].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Establishing CMPK2 as an interferon-stimulated gene with antiviral function resolved its initial biological context as a component of type I IFN-mediated host defense.\",\n      \"evidence\": \"siRNA knockdown attenuated IFN-α2b-mediated HIV restriction in human CD4+ T cells\",\n      \"pmids\": [\"30083606\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of antiviral action unresolved\", \"Not yet linked to mtDNA or inflammasome biology\", \"Single-virus/single-cell-type system\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that CMPK2 localizes to mitochondria, drives mtDNA synthesis, and is required for NLRP3 inflammasome activation established the central mechanistic link between its kinase activity, mtDNA replication, and inflammatory signaling.\",\n      \"evidence\": \"siRNA knockdown and CRISPR-KO in macrophages/microglia with measurement of newly synthesized mtDNA, Ox-mtDNA, and NLRP3 activation; JAK inhibitor studies and subcellular fractionation confirmed dual localization and JAK-STAT pathway dependence\",\n      \"pmids\": [\"34142025\", \"33874983\", \"34269108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct enzymatic substrate specificity in mitochondria not reconstituted\", \"Whether cytosolic pool has independent function unclear\", \"Structural basis of CMPK2-NLRP3 axis unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Bidirectional perturbation of CMPK2 in macrophages—both silencing and constitutive overexpression—disrupted mitochondrial homeostasis and shifted metabolism toward glycolysis, revealing that tightly regulated CMPK2 expression is essential for macrophage immune homeostasis.\",\n      \"evidence\": \"siRNA knockdown and stable overexpression in macrophage lines with mitochondrial membrane potential, ROS, and metabolic flux readouts\",\n      \"pmids\": [\"36451821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dose–response relationship for CMPK2 activity not quantified\", \"Glycolytic shift mechanism not fully delineated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of a natural CMPK2 inhibitor (Dracorhodin) that binds Lys265, combined with validation in myeloid-specific Cmpk2-KO mice, provided the first direct enzymatic activity measurement and on-target pharmacological confirmation in vivo.\",\n      \"evidence\": \"ADP-Glo kinase assay with recombinant CMPK2, MS-based lysine reactivity profiling, microscale thermophoresis Kd, myeloid-specific Cmpk2-KO mouse sepsis model\",\n      \"pmids\": [\"37859535\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of CMPK2 with inhibitor not solved\", \"Selectivity over CMPK1 not fully profiled\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Human genetic evidence that biallelic CMPK2 loss-of-function variants cause familial brain calcification, with corresponding mtDNA depletion and mitochondrial structural defects in knock-in mice, demonstrated a non-redundant physiological role for CMPK2 in neuronal mitochondrial maintenance.\",\n      \"evidence\": \"Patient genetics, Cmpk2-KO and patient-mutation knock-in mice, electron microscopy, mitochondrial functional assays, single-cell RNA-seq\",\n      \"pmids\": [\"36443312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking mtDNA depletion to brain calcification not resolved\", \"Cell-type specificity of vulnerability (neurons vs. glia) incompletely defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Domain dissection revealed that the kinase-independent N-terminal domain is sufficient to restrict Zika virus translation, while cooperation with Viperin-derived ddhCTP through both the catalytic and a novel antiviral key domain is required for coronavirus restriction, bifurcating CMPK2's antiviral mechanisms.\",\n      \"evidence\": \"Overexpression of truncated/mutated CMPK2 constructs in flavivirus and coronavirus infection systems; viral translation and RdRp activity assays\",\n      \"pmids\": [\"37075076\", \"36930652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"NTD target on the ribosome/viral RNA unknown\", \"ddhCTP phosphorylation by CMPK2 not directly demonstrated with purified enzyme\", \"Whether NTD and catalytic antiviral arms are additive or independent in mixed infections unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cell-type-specific CMPK2 knockdown in microglia reduced infarct volume and improved neurological outcomes after ischemic stroke, translating the CMPK2–mtDNA–NLRP3 axis into a disease-relevant in vivo therapeutic target.\",\n      \"evidence\": \"Cre-dependent AAV-mediated CMPK2 knockdown in CX3CR1Cre/ERT2 mice, ischemic stroke model with pharmacological CMPK2 inhibition replication\",\n      \"pmids\": [\"38701781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term safety of CMPK2 inhibition in the brain not assessed\", \"Whether peripheral CMPK2 inhibition contributes unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that ZDHHC20-mediated palmitoylation at C137/C153 maintains CMPK2 mitochondrial localization, and that this modification is required for ddhCTP production and MAVS stabilization, revealed a post-translational regulatory switch controlling both metabolic and antiviral outputs.\",\n      \"evidence\": \"Palmitoylation assays, ZDHHC20 overexpression/knockdown, PPT1-KO, C137A/C153A mutagenesis, mitochondrial localization imaging, ddhCTP and MAVS interaction assays\",\n      \"pmids\": [\"42011944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of palmitoylation cycling during infection unknown\", \"Whether other palmitoyltransferases contribute not excluded\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proximity labeling and reconstitution in isolated mitochondria showed TK2 and CMPK2 form a compartmentalized phosphorylation complex in the mitochondrial matrix, channeling TMP to TDP without diffusion, establishing the biochemical logic of mitochondrial nucleotide salvage.\",\n      \"evidence\": \"Proximity labeling, immunofluorescence, isolated mitochondria incubation with radiolabeled substrates, azidothymidine blockade, broken-mitochondria controls\",\n      \"pmids\": [\"40967432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of TK2-CMPK2 complex not determined\", \"Whether CMPK2 also channels CMP/UMP phosphorylation in vivo not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Multiple transcription factors—STAT2, Spi1/PU.1, RUNX1, and GATA6—were shown to directly regulate CMPK2 transcription in distinct cellular contexts, revealing a multi-layered transcriptional control architecture for this gene.\",\n      \"evidence\": \"ChIP and dual-luciferase assays (STAT2 in macrophages, Spi1 in colitis model), conditional Gata6-KO endothelial mice, RUNX1 identification in microglia\",\n      \"pmids\": [\"41351988\", \"40288675\", \"37339559\", \"40252934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Epigenetic regulation and chromatin accessibility at the CMPK2 locus not characterized\", \"Relative contribution of each TF in a single cell type not compared\", \"RUNX1 binding to CMPK2 promoter not confirmed by ChIP\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"CMPK2 activates the cGAS-STING pathway via mtDNA release and is required for neutrophil bactericidal function through a STING-dependent mechanism, extending its innate immune role beyond inflammasome activation.\",\n      \"evidence\": \"CMPK2 overexpression/cGAS knockdown epistasis in microglia; Cmpk2-KO mice with STING inhibitor C176 in bacterial infection and phagocytosis assays\",\n      \"pmids\": [\"40189684\", \"40616692\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CMPK2-cGAS physical interaction awaits validation beyond molecular docking\", \"Relative importance of NLRP3 vs. cGAS-STING downstream of CMPK2 in different infections not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the atomic structure of CMPK2 and its complexes, the precise mechanism by which the NTD blocks viral translation, whether cytosolic CMPK2 has functions independent of mitochondrial localization, and how palmitoylation dynamics integrate metabolic and antiviral outputs during infection.\",\n      \"evidence\": \"Open questions from current literature\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No crystal or cryo-EM structure of CMPK2\", \"NTD antiviral target not identified\", \"Cytosolic CMPK2 function undefined\", \"In vivo palmitoylation dynamics uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 4, 11, 13]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [4, 11, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 2, 4, 5, 13, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 3, 6, 9, 14, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 8, 15, 17]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 7, 13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 10, 11]}\n    ],\n    \"complexes\": [\n      \"TK2-CMPK2 mitochondrial nucleotide salvage complex\"\n    ],\n    \"partners\": [\n      \"TK2\",\n      \"ZDHHC20\",\n      \"PPT1\",\n      \"NLRP3\",\n      \"TRIM7\",\n      \"VIPERIN\",\n      \"MAVS\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}