{"gene":"CMPK2","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2021,"finding":"CMPK2 is localized to mitochondria and is required for mitochondrial DNA synthesis; its knockdown reduces newly synthesized mtDNA and oxidized mtDNA (Ox-mtDNA) formation, thereby blocking NLRP3 inflammasome activation in microglia/macrophages.","method":"siRNA knockdown, CRISPR-Cas9 knockout, subcellular fractionation, AAV-mediated knockdown in CX3CR1Cre/ERT2 mice","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal KD and KO approaches, replicated across mouse and human cells, multiple orthogonal methods (siRNA, CRISPR, in vivo AAV), consistent mechanistic readout across multiple studies","pmids":["34142025","38701781"],"is_preprint":false},{"year":2024,"finding":"Microglial CMPK2 knockdown in ischemic mice suppresses NLRP3 inflammasome activation by limiting newly synthesized mtDNA and Ox-mtDNA formation, reducing infarct size and improving neurological outcomes.","method":"Cre recombination-dependent AAV knockdown in CX3CR1Cre/ERT2 mice, measurement of mtDNA/Ox-mtDNA, NLRP3 inflammasome activation assays","journal":"Cell reports. Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional cell-type-specific in vivo KD with defined mechanistic pathway (mtDNA → NLRP3), multiple orthogonal readouts","pmids":["38701781"],"is_preprint":false},{"year":2022,"finding":"Loss-of-function biallelic variants in CMPK2 cause mitochondrial deficiency: Cmpk2-knockout mouse neurons have fewer mtDNA copies, down-regulated mitochondrial proteins, reduced ATP production, elevated intracellular inorganic phosphate, and impaired cristae architecture, leading to brain calcification.","method":"Cmpk2 knockout mice, knock-in mice bearing patient mutation, transcriptome analysis of patient PBMCs, in situ hybridization, single-cell RNA sequencing, electron microscopy of neuronal mitochondria","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — patient genetics corroborated by KO and knock-in mouse models, multiple orthogonal methods including ultrastructural analysis and metabolic readouts","pmids":["36443312"],"is_preprint":false},{"year":2023,"finding":"CMPK2 restricts Zika virus replication by specifically inhibiting viral translation; the N-terminal domain (NTD) lacking kinase activity is sufficient for antiviral activity, and seven conserved cysteine residues within the NTD are critical. Mitochondrial localization of CMPK2 is required for its antiviral effects.","method":"CMPK2 overexpression, domain deletion/mutagenesis (NTD constructs, cysteine mutants), viral replication assays, mitochondrial targeting sequence deletion","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — active-site and domain mutagenesis with functional viral replication readouts, kinase-dead NTD shown sufficient, replicated across multiple flaviviruses","pmids":["37075076"],"is_preprint":false},{"year":2023,"finding":"CMPK2 acts as a host restriction factor against multiple coronaviruses; its antiviral activity requires both the classical catalytic domain and a newly identified antiviral key domain. CMPK2, together with Viperin and ddhCTP, suppresses RNA-dependent RNA polymerase activity of CoVs. CMPK2 transcription is regulated by IFN-dependent and IRF1-dependent pathways post-infection.","method":"Transcriptomic analysis, overexpression and knockdown in multiple cell types, domain mutant analysis, ddhCTP production assay, RNA polymerase activity assay","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods including domain mutagenesis and RdRp activity assays, mechanism demonstrated across multiple CoV genera","pmids":["36930652"],"is_preprint":false},{"year":2018,"finding":"CMPK2 is associated with type I IFN-induced HIV restriction in humans; RNAi knockdown of CMPK2 attenuated the antiviral effect of IFN on HIV restriction in CD4+ T cell culture.","method":"In vivo IFN-α2b injection in HIV-infected patients, RNA sequencing of activated CD4+ T cells, in vitro RNAi knockdown, HIV replication assay","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo human data plus in vitro RNAi validation, single lab, two orthogonal methods","pmids":["30083606"],"is_preprint":false},{"year":2021,"finding":"CMPK2 is present in both mitochondrial and cytosolic fractions in macrophages; IFN-α-induced CMPK2 expression is inhibited by JAK1/2 and Tyk2 inhibitors. Both knockdown and knockout of CMPK2 attenuate IFN-α-mediated foam cell formation by reducing scavenger receptor class A (SR-A) expression and mtROS production, and blocking inflammasome activation.","method":"Subcellular fractionation, siRNA knockdown, CRISPR/Cas9 knockout, JAK inhibitor treatment, SR-A expression assay, foam cell quantification by Oil Red O/Dil-oxLDL","journal":"Arthritis research & therapy","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal KD and KO with multiple orthogonal mechanistic readouts, subcellular localization experimentally determined","pmids":["33874983"],"is_preprint":false},{"year":2022,"finding":"Bidirectional alteration of CMPK2 expression (both silencing and constitutive overexpression) in macrophages disrupts mitochondrial physiology, causing membrane potential depolarization, elevated ROS, disturbed architecture, and increased glycolytic flux, resulting in pro-inflammatory gene expression (IL-1β, TNF-α, IL-8).","method":"siRNA knockdown, stable overexpression, mitochondrial membrane potential assay, ROS measurement, metabolic flux analysis, cytokine gene expression","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation with multiple organelle readouts, single lab","pmids":["36451821"],"is_preprint":false},{"year":2021,"finding":"CBD decreases CMPK2 expression, which subsequently inhibits generation of oxidized mitochondrial DNA and suppresses NLRP3 inflammasome activation and pyroptosis; these effects are mediated mostly by PPARγ and partially by CB1 receptor.","method":"In vivo oral ulcer mouse model, gene expression analysis, CBD treatment, GSDMD and pyroptosis quantification, PPARγ and CB1 antagonist treatment","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue with pharmacological antagonists identifying upstream regulators, single lab","pmids":["34269108"],"is_preprint":false},{"year":2021,"finding":"CMPK2 knockdown reduces NLRP3 inflammasome activation and related cytokines (IL-18, IL-1β, cleaved-caspase-1) in hepatic I/R injury; functional analysis shows CMPK2 is dispensable for AIM2 inflammasome but is required specifically for NLRP3 inflammasome activation in this context.","method":"CMPK2 knockdown in RAW264.7 cells, H/R model, AIM2 and NLRP3 inhibition, in vivo mouse hepatic I/R model, serum cytokine assay, ALT/AST measurement","journal":"Experimental and therapeutic medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inflammasome-specific dissection using inhibitors, positive and negative controls, single lab","pmids":["34659504"],"is_preprint":false},{"year":2023,"finding":"GATA6 directly targets CMPK2 as a transcriptional target gene; endothelial CMPK2 mediates monocyte adherence and migration, and pro-inflammatory macrophage foam cell formation through regulation of the CMPK2-NLRP3 pathway in atherosclerosis.","method":"Endothelial cell-specific Gata6 knockout mouse model, ChIP/target gene identification, AAV9-Icam2-driven Cmpk2-shRNA endothelial delivery, in vivo atherosclerosis lesion quantification","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct transcriptional target identification plus in vivo endothelial-specific rescue, multiple orthogonal approaches","pmids":["37339559"],"is_preprint":false},{"year":2024,"finding":"FTO regulates CMPK2 expression in fibroblast-like synoviocytes; the FTO-CMPK2 pathway controls synovial inflammation through the mtDNA-mediated cGAS/STING pathway, affecting chondrocyte homeostasis in rheumatoid arthritis.","method":"FTO inhibition, gene knockdown, in vitro and in vivo RA models, cGAS/STING pathway analysis","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown and pharmacological inhibition, pathway placement via cGAS/STING readouts, single lab","pmids":["38481810"],"is_preprint":false},{"year":2025,"finding":"CMPK2 promotes microglial activation and neuroinflammation through the cGAS-STING signaling pathway; molecular docking experiments show CMPK2 stably binds to cGAS at the protein level, and cGAS knockdown mitigated CMPK2 overexpression-induced neuroinflammatory responses.","method":"LPS-treated BV2 and primary microglial cells, CMPK2 overexpression, cGAS knockdown, cytokine measurement, molecular docking","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — protein-level interaction by docking (not biochemical pulldown), functional rescue by cGAS KD supports pathway placement; single lab","pmids":["40189684"],"is_preprint":false},{"year":2025,"finding":"CMPK2 facilitates neuropathic pain by enhancing glycolysis in microglia, leading to increased lactate production that induces lactylation and deactivation of STING, thereby suppressing IFN-I production. RUNX1 was identified as a transcription factor that promotes CMPK2 upregulation in microglia.","method":"Cmpk2 deficiency (in vivo/in vitro), microglial overexpression, glycolysis flux assay, lactate measurement, STING lactylation assay, RUNX1 ChIP/promoter analysis","journal":"Brain, behavior, and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel PTM (lactylation) mechanistic link with functional rescue, single lab, multiple methods","pmids":["40252934"],"is_preprint":false},{"year":2025,"finding":"CMPK2 interacts with TK2 in mitochondria; proximity labeling and immunofluorescence microscopy show TK2-CMPK2 co-localization, and their association prevents TMP from diffusing away, enabling compartmentalized two-step phosphorylation of thymidine to TDP within the mitochondrial matrix.","method":"Proximity labeling (BioID/equivalent), immunofluorescence microscopy, differential centrifugation fractionation, AZT-block assays in isolated mitochondria from rat heart, liver, kidney, brain","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — proximity labeling, fractionation, and functional enzyme assays across multiple tissues, mechanistic substrate channeling model validated","pmids":["40967432"],"is_preprint":false},{"year":2026,"finding":"TRIM7, an E3 ubiquitin ligase, interacts with CMPK2 and negatively regulates its expression; TRIM7 overexpression mitigates inflammation and apoptosis in renal ischemia-reperfusion injury, and CMPK2 inhibition reverses the enhanced inflammation seen upon TRIM7 knockout.","method":"Co-immunoprecipitation, TRIM7 overexpression and knockout (in vivo and in vitro), CMPK2 inhibition rescue experiment, renal IRI model","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction with functional rescue experiment, single lab","pmids":["41723894"],"is_preprint":false},{"year":2026,"finding":"Palmitic acid (PA) induces CMPK2 palmitoylation, which maintains its mitochondrial localization. ZDHHC20 catalyzes CMPK2 palmitoylation at cysteines 137 and 153; the thioesterase PPT1 removes this modification. Palmitoylated CMPK2 promotes production of ddhCTP and stabilizes MAVS, enhancing IFN-I production against RNA viruses. PPT1 deficiency restores CMPK2 palmitoylation and antiviral immunity.","method":"Palmitoylation assay, site-directed mutagenesis (Cys137/Cys153), ZDHHC20 and PPT1 knockdown/overexpression, mitochondrial localization imaging, MAVS co-IP, ddhCTP production assay, viral replication assay","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of palmitoylation sites plus writer/eraser identification with multiple orthogonal functional readouts, single lab but highly integrated","pmids":["42011944"],"is_preprint":false},{"year":2026,"finding":"CMPK2 interacts with IKKα/β via its C-terminal domain, enhancing NF-κB phosphorylation and NLRP3 inflammasome activation. LPS induces CMPK2 translocation from cytoplasm to nucleus. The C-terminal domain is essential for pro-inflammatory NF-κB activity, whereas deletion of the N-terminal mitochondrial targeting sequence does not abolish this activity.","method":"Co-immunoprecipitation, dual-luciferase reporter assay, confocal microscopy (localization), domain deletion mutants, NF-κB pathway inhibitor (BAY11-7082) rescue, CMPK2 KO mice","journal":"International immunopharmacology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — co-IP plus domain mutagenesis plus pharmacological rescue, subcellular translocation documented, single lab with multiple orthogonal methods","pmids":["42208328"],"is_preprint":false},{"year":2025,"finding":"STAT2 directly binds to the CMPK2 promoter and regulates its transcription; DSG interacts with STAT2 at Pro630 and Lys689 residues, inhibiting STAT2 phosphorylation and downstream CMPK2 expression, thereby suppressing mtDNA synthesis in macrophages.","method":"Chromatin immunoprecipitation (ChIP), Stat2 knockdown/overexpression, surface plasmon resonance, Western blotting, mtDNA synthesis assay","journal":"Phytomedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and SPR providing direct regulatory mechanism, single lab","pmids":["41351988"],"is_preprint":false},{"year":2025,"finding":"IRF3 associates with the CMPK2 promoter and regulates CMPK2 transcription following mitochondrial DNA release and cGAS-STING pathway activation in the context of neuropathic pain, suggesting a feedback loop where CMPK2 upregulation further enhances mtDNA synthesis and innate immune activation.","method":"ChIP-seq/promoter analysis, single-cell RNA sequencing, AAV-mediated CMPK2 silencing, pharmacological inhibition with NDGA, in vivo nerve injury model, BV2 and primary microglia experiments","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP identifies IRF3 at CMPK2 promoter, functional rescue with genetic and pharmacological interventions, single lab","pmids":["42174715"],"is_preprint":false},{"year":2023,"finding":"Dracorhodin (DP) covalently targets CMPK2 at lysine 265, inhibiting its kinase activity; this inhibition suppresses NLRP3 inflammasome activation via the LPS-induced CMPK2 pathway, and the anti-sepsis effect of DP is weakened in myeloid-specific Cmpk2-ablated mice.","method":"Affinity MS, quantitative lysine reactivity profiling, mutant binding tests, recombinant CMPK2 kinase assay (ADP-GLO), microscale thermophoresis (Kd measurement), myeloid-specific Cmpk2-KO mouse model","journal":"Clinical and translational medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — active site residue identified by MS-based covalent profiling, confirmed with mutagenesis, biochemical kinase assay, and in vivo cell-type-specific KO validation","pmids":["37859535"],"is_preprint":false},{"year":2025,"finding":"Cmpk2 deficiency in neutrophils impairs bacterial phagocytosis and reduces host survival during bacterial infection; the phagocytosis deficit is STING-dependent, as differences between WT and Cmpk2 KO neutrophils are eliminated by a STING inhibitor.","method":"Cmpk2 global KO mice, flow cytometry phagocytosis assay, STING inhibitor (C176) rescue, zebrafish embryo infection model, scRNA-seq analysis","journal":"Lung","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with pharmacological pathway rescue and independent zebrafish model, single lab","pmids":["40616692"],"is_preprint":false},{"year":2022,"finding":"In chicken cells, Asp135 in the TMK (thymidylate kinase) catalytic domain of CMPK2 is critical for antiviral activity against AIV and NDV; CMPK2 expression is regulated by the MDA5/IFN-β pathway.","method":"Site-directed mutagenesis (Asp135), overexpression, MDA5 and IFN-β knockdown, viral replication assay in DF-1 cells","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — active-site mutagenesis with functional antiviral readout and upstream pathway knockdown, single lab","pmids":["35633731"],"is_preprint":false},{"year":2023,"finding":"miR-202-5p (from BMSC-derived exosomes) directly targets CMPK2 mRNA; validated by dual-luciferase reporter assay and RNA immunoprecipitation. CMPK2 knockdown reverses the pro-pyroptosis effect of exosomal miR-202-5p inhibition in lung ischemia-reperfusion injury.","method":"Dual-luciferase reporter assay, RNA immunoprecipitation, CMPK2 knockdown, H/R cell model, pyroptosis marker quantification","journal":"The Kaohsiung journal of medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct miRNA-target validation by two orthogonal methods, functional rescue, single lab","pmids":["37092308"],"is_preprint":false},{"year":2025,"finding":"CMPK2 promotes NLRP3 inflammasome activation via the mtDNA-cGAS-STING pathway in allergic rhinitis; depletion of mtDNA or inhibition of STING signaling reduces HDM-induced NLRP3 activation, and genetic knockout of CMPK2 or STING alleviates AR symptoms in mice.","method":"CMPK2 overexpression in HNEPCs, CMPK2 and STING genetic knockout mice, mtDNA depletion, STING inhibition, NLRP3/ASC/CASP1/IL-1β measurement","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO of both CMPK2 and STING with pathway epistasis, single lab","pmids":["39799434"],"is_preprint":false},{"year":2025,"finding":"Hepatocyte-specific Cmpk2 deletion mitigates liver injury, inflammation, and fibrosis in MASH mice by suppressing NLRP3 inflammasome activation and hepatic pyroptosis; nordihydroguaiaretic acid (NDGA) was identified as a pharmacological CMPK2 inhibitor via surface plasmon resonance imaging coupled with enzyme activity detection.","method":"Hepatocyte-specific conditional Cmpk2 knockout mice, multiple murine MASH models, surface plasmon resonance imaging, NLRP3 inflammasome assays, pyroptosis quantification","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO in multiple disease models with biochemical inhibitor identification, multiple orthogonal methods","pmids":["39855350"],"is_preprint":false},{"year":2026,"finding":"RSAD2 (Viperin) and CMPK2 coordinately regulate EBV reactivation; depletion of CMPK2 led to reactivation of EBV lytic gene expression during latency. RSAD2 and CMPK2 have overlapping functions in regulating IFN-signaling pathways, oxidative phosphorylation, protein translation, and unfolded protein response. Both converge on control of GSDMD-associated pyroptosis and ATF-4-associated UPR despite distinct subcellular localizations (ER vs. mitochondria).","method":"RSAD2 and CMPK2 depletion in B-lymphocytes, transcriptomic analysis, ddhCTP production assay (RSAD2-dependent), metabolomics","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic depletion with transcriptomic and metabolomic readouts; preprint, not yet peer reviewed","pmids":["41676616"],"is_preprint":true}],"current_model":"CMPK2 (cytidine/uridine monophosphate kinase 2) is a mitochondrially localized nucleotide kinase that phosphorylates CMP/UMP to CDP/UDP and is rate-limiting for de novo mitochondrial DNA (mtDNA) synthesis; its enzymatic activity drives mtDNA production and the generation of oxidized mtDNA, which activates the NLRP3 inflammasome and cGAS-STING pathway, linking mitochondrial nucleotide metabolism to innate immune signaling. CMPK2 is a type I interferon-stimulated gene that also exerts kinase-independent antiviral activity (via its N-terminal cysteine-rich domain) against flaviviruses and, in concert with Viperin-produced ddhCTP, inhibits coronavirus RNA-dependent RNA polymerases. Its mitochondrial retention is maintained by palmitoylation at Cys137/153 catalyzed by ZDHHC20 and removed by PPT1; physical interaction with TK2 within mitochondria enables substrate channeling for thymidine phosphorylation. Transcriptional regulation occurs via JAK/STAT2 and IRF1/IRF3 pathways, and TRIM7 (an E3 ubiquitin ligase) negatively regulates CMPK2 protein levels. Downstream inflammatory signaling involves CMPK2 interaction with IKKα/β through its C-terminal domain to activate NF-κB/NLRP3, while excessive CMPK2-driven glycolysis produces lactate that lactylates and inactivates STING, suppressing IFN-I in neuropathic pain contexts."},"narrative":{"mechanistic_narrative":"CMPK2 (cytidine/uridine monophosphate kinase 2) is a mitochondrially localized nucleotide kinase that is rate-limiting for de novo synthesis of mitochondrial DNA and the generation of oxidized mtDNA, coupling mitochondrial nucleotide metabolism to innate immune signaling [PMID:34142025, PMID:38701781, PMID:36443312]. Its kinase activity depends on conserved catalytic residues, including a TMK-domain aspartate and a covalently targetable lysine (Lys265), and produces newly synthesized mtDNA whose oxidized form drives NLRP3 inflammasome activation across diverse tissues and disease settings, including cerebral ischemia, hepatic injury, MASH, atherosclerosis, and allergic rhinitis [PMID:38701781, PMID:37859535, PMID:39855350, PMID:39799434, PMID:37339559]. The same mtDNA output feeds the cGAS-STING axis: CMPK2 binds cGAS and amplifies STING-dependent neuroinflammation and inflammasome signaling [PMID:40189684, PMID:38481810, PMID:39799434]. Beyond mtDNA, CMPK2 acts as a type I interferon-stimulated antiviral effector with both kinase-dependent and kinase-independent activities — its N-terminal cysteine-rich domain alone restricts flavivirus translation, while the catalytic domain works together with Viperin-produced ddhCTP to suppress coronavirus RNA-dependent RNA polymerase, with mitochondrial localization required for antiviral function [PMID:37075076, PMID:36930652]. In mitochondria CMPK2 physically associates with TK2 to compartmentalize two-step thymidine phosphorylation through substrate channeling [PMID:40967432], and its mitochondrial retention is controlled by ZDHHC20-catalyzed palmitoylation at Cys137/153, reversed by PPT1, which also promotes ddhCTP production and MAVS stabilization for antiviral IFN-I [PMID:42011944]. CMPK2 also has a kinase-independent pro-inflammatory arm: it interacts with IKKα/β through its C-terminal domain to activate NF-κB and NLRP3 [PMID:42208328]. Transcription is driven by JAK/STAT2, IRF1/IRF3, GATA6, and RUNX1, and protein levels are negatively regulated by the E3 ligase TRIM7 [PMID:41351988, PMID:42174715, PMID:37339559, PMID:40252934, PMID:41723894]. Biallelic loss-of-function CMPK2 variants cause a mitochondrial deficiency with reduced mtDNA copy number, impaired ATP production, and abnormal cristae leading to brain calcification [PMID:36443312].","teleology":[{"year":2021,"claim":"Establishing that CMPK2 is mitochondrial and rate-limiting for newly synthesized and oxidized mtDNA answered how a nucleotide kinase could control inflammasome activation, placing it upstream of NLRP3 via Ox-mtDNA.","evidence":"siRNA/CRISPR knockout, subcellular fractionation, and in vivo AAV knockdown in microglia/macrophages","pmids":["34142025","38701781"],"confidence":"High","gaps":["Did not define the enzymatic step or substrate specificity in vitro","Mechanism of mtDNA oxidation not resolved"]},{"year":2021,"claim":"Demonstrating that CMPK2 also resides in cytosolic fractions and that its IFN-α induction is JAK/Tyk2-dependent connected interferon signaling to CMPK2-driven mtROS, scavenger receptor expression, and foam cell formation.","evidence":"Subcellular fractionation, reciprocal KD/KO, JAK inhibitors, and foam cell assays in macrophages","pmids":["33874983"],"confidence":"High","gaps":["Functional role of the cytosolic pool versus mitochondrial pool not separated","Direct STAT effector at the promoter not identified here"]},{"year":2022,"claim":"Patient genetics combined with knockout/knock-in mice established CMPK2 as a Mendelian disease gene, showing loss-of-function causes mtDNA depletion, bioenergetic failure, and brain calcification.","evidence":"Cmpk2 KO and patient-mutation knock-in mice, patient PBMC transcriptomics, EM of neuronal mitochondria","pmids":["36443312"],"confidence":"High","gaps":["Tissue selectivity of the calcification phenotype unexplained","Link between elevated inorganic phosphate and calcification not mechanistically closed"]},{"year":2023,"claim":"Domain mapping revealed CMPK2's antiviral activity is partly kinase-independent — the N-terminal cysteine-rich domain alone restricts flavivirus translation — distinguishing its enzymatic from non-enzymatic functions.","evidence":"Domain deletion and cysteine mutagenesis with Zika replication assays and mitochondrial targeting deletion","pmids":["37075076"],"confidence":"High","gaps":["Molecular target of NTD-mediated translation block unknown","How mitochondrial localization enables a translation-targeting effect unresolved"]},{"year":2023,"claim":"Showing CMPK2 cooperates with Viperin/ddhCTP to inhibit coronavirus RdRp clarified how its catalytic domain and a separate antiviral domain jointly enable broad antiviral restriction.","evidence":"Domain mutants, ddhCTP production and RdRp activity assays across multiple CoV genera; IFN/IRF1-dependent transcription","pmids":["36930652"],"confidence":"High","gaps":["Exact biochemical product of CMPK2 feeding ddhCTP synthesis not fully defined","Stoichiometry of CMPK2-Viperin cooperation unresolved"]},{"year":2023,"claim":"Identification of a covalent inhibitor binding Lys265 with a confirmed in vitro kinase assay pinned a catalytically essential residue and validated CMPK2 as a druggable anti-inflammatory target.","evidence":"Affinity MS, lysine reactivity profiling, recombinant kinase assay, MST, myeloid-specific Cmpk2-KO mice","pmids":["37859535"],"confidence":"High","gaps":["Full active-site architecture and substrate-binding mode not structurally resolved"]},{"year":2025,"claim":"Proximity labeling and functional channeling assays established a physical CMPK2-TK2 association that compartmentalizes thymidine phosphorylation, defining a concrete enzymatic partnership in the mitochondrial matrix.","evidence":"Proximity labeling, immunofluorescence, fractionation, and AZT-block assays in isolated mitochondria from multiple rat tissues","pmids":["40967432"],"confidence":"High","gaps":["Whether channeling extends to cytidine/uridine substrates not addressed","Structural basis of the TK2-CMPK2 interface unknown"]},{"year":2025,"claim":"Multiple disease-specific studies converged on a CMPK2 → mtDNA → cGAS-STING/NLRP3 inflammatory axis, including a direct CMPK2-cGAS binding model and STING-dependent epistasis in allergic and neutrophil contexts.","evidence":"Genetic KO of CMPK2 and STING, mtDNA depletion, STING inhibitors, molecular docking, and phagocytosis assays across AR, neuroinflammation, and bacterial infection models","pmids":["40189684","39799434","40616692","38481810"],"confidence":"Medium","gaps":["CMPK2-cGAS interaction rests on docking, not biochemical pulldown","Whether CMPK2 binds cGAS directly or acts solely through mtDNA not separated"]},{"year":2025,"claim":"A glycolysis-lactylation branch was uncovered in which CMPK2-driven lactate lactylates and deactivates STING to suppress IFN-I, revealing context-dependent dual output that can both activate and dampen innate immunity.","evidence":"Cmpk2 deficiency/overexpression, glycolysis flux, STING lactylation assays, and RUNX1 promoter analysis in microglia","pmids":["40252934"],"confidence":"Medium","gaps":["How CMPK2 enhances glycolytic flux mechanistically unresolved","Tissue/context determinants of pro- versus anti-IFN outcome unclear"]},{"year":2025,"claim":"Transcription factor mapping (STAT2, IRF3, GATA6, RUNX1) defined the regulatory network that places CMPK2 downstream of interferon and stress signaling, including a feed-forward loop amplifying mtDNA synthesis.","evidence":"ChIP, SPR, knockdown/overexpression of STAT2/IRF3, GATA6 endothelial KO, and RUNX1 promoter analysis","pmids":["41351988","42174715","37339559","40252934"],"confidence":"Medium","gaps":["Relative hierarchy of these transcription factors across cell types not established","Combinatorial promoter regulation unresolved"]},{"year":2026,"claim":"Palmitoylation control resolved how CMPK2's mitochondrial retention and antiviral output are dynamically regulated, identifying ZDHHC20 as writer, PPT1 as eraser, and MAVS stabilization plus ddhCTP as downstream effects.","evidence":"Palmitoylation assay, Cys137/153 mutagenesis, ZDHHC20/PPT1 manipulation, MAVS co-IP, ddhCTP and viral assays","pmids":["42011944"],"confidence":"High","gaps":["How palmitoylation status couples to kinase activity not defined","Physiological signals driving dynamic depalmitoylation in vivo unclear"]},{"year":2026,"claim":"A C-terminal-dependent CMPK2-IKKα/β interaction and LPS-induced nuclear translocation established a kinase- and mitochondria-independent pro-inflammatory arm driving NF-κB/NLRP3.","evidence":"Co-IP, luciferase reporters, domain deletion mutants, NF-κB inhibitor rescue, confocal localization, CMPK2 KO mice","pmids":["42208328"],"confidence":"High","gaps":["Nuclear function of CMPK2 not characterized beyond translocation","Direct IKK substrate/CMPK2 binding interface not mapped"]},{"year":2026,"claim":"Identifying TRIM7 as an E3 ligase that interacts with and negatively regulates CMPK2 added post-translational turnover as a control point limiting CMPK2-driven inflammation.","evidence":"Co-IP, TRIM7 overexpression/knockout, CMPK2 inhibition rescue in renal IRI","pmids":["41723894"],"confidence":"Medium","gaps":["Direct ubiquitination of CMPK2 by TRIM7 and target residues not demonstrated","Single Co-IP-based interaction without reciprocal validation"]},{"year":null,"claim":"How CMPK2's distinct functional arms — mitochondrial nucleotide channeling, kinase-independent antiviral restriction, cytosolic/nuclear NF-κB activation, and glycolysis-driven STING lactylation — are coordinated within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating catalytic and non-catalytic domains","Switch governing pro-inflammatory versus IFN-suppressive output undefined","Direct substrate spectrum (CMP/UMP versus thymidine pathway) not biochemically delineated in human enzyme"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[14,20,22]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[20]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[14,4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,3,14,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,17]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,3,4,24]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,14]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,13]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,25,10]}],"complexes":[],"partners":["TK2","IKKΑ/Β","CGAS","MAVS","TRIM7","ZDHHC20","PPT1","RSAD2"],"other_free_text":[]}},"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). 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Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional cell-type-specific in vivo KD with defined mechanistic pathway (mtDNA → NLRP3), multiple orthogonal readouts\",\n      \"pmids\": [\"38701781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss-of-function biallelic variants in CMPK2 cause mitochondrial deficiency: Cmpk2-knockout mouse neurons have fewer mtDNA copies, down-regulated mitochondrial proteins, reduced ATP production, elevated intracellular inorganic phosphate, and impaired cristae architecture, leading to brain calcification.\",\n      \"method\": \"Cmpk2 knockout mice, knock-in mice bearing patient mutation, transcriptome analysis of patient PBMCs, in situ hybridization, single-cell RNA sequencing, electron microscopy of neuronal mitochondria\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — patient genetics corroborated by KO and knock-in mouse models, multiple orthogonal methods including ultrastructural analysis and metabolic readouts\",\n      \"pmids\": [\"36443312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CMPK2 restricts Zika virus replication by specifically inhibiting viral translation; the N-terminal domain (NTD) lacking kinase activity is sufficient for antiviral activity, and seven conserved cysteine residues within the NTD are critical. Mitochondrial localization of CMPK2 is required for its antiviral effects.\",\n      \"method\": \"CMPK2 overexpression, domain deletion/mutagenesis (NTD constructs, cysteine mutants), viral replication assays, mitochondrial targeting sequence deletion\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — active-site and domain mutagenesis with functional viral replication readouts, kinase-dead NTD shown sufficient, replicated across multiple flaviviruses\",\n      \"pmids\": [\"37075076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CMPK2 acts as a host restriction factor against multiple coronaviruses; its antiviral activity requires both the classical catalytic domain and a newly identified antiviral key domain. CMPK2, together with Viperin and ddhCTP, suppresses RNA-dependent RNA polymerase activity of CoVs. CMPK2 transcription is regulated by IFN-dependent and IRF1-dependent pathways post-infection.\",\n      \"method\": \"Transcriptomic analysis, overexpression and knockdown in multiple cell types, domain mutant analysis, ddhCTP production assay, RNA polymerase activity assay\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods including domain mutagenesis and RdRp activity assays, mechanism demonstrated across multiple CoV genera\",\n      \"pmids\": [\"36930652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CMPK2 is associated with type I IFN-induced HIV restriction in humans; RNAi knockdown of CMPK2 attenuated the antiviral effect of IFN on HIV restriction in CD4+ T cell culture.\",\n      \"method\": \"In vivo IFN-α2b injection in HIV-infected patients, RNA sequencing of activated CD4+ T cells, in vitro RNAi knockdown, HIV replication assay\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo human data plus in vitro RNAi validation, single lab, two orthogonal methods\",\n      \"pmids\": [\"30083606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CMPK2 is present in both mitochondrial and cytosolic fractions in macrophages; IFN-α-induced CMPK2 expression is inhibited by JAK1/2 and Tyk2 inhibitors. Both knockdown and knockout of CMPK2 attenuate IFN-α-mediated foam cell formation by reducing scavenger receptor class A (SR-A) expression and mtROS production, and blocking inflammasome activation.\",\n      \"method\": \"Subcellular fractionation, siRNA knockdown, CRISPR/Cas9 knockout, JAK inhibitor treatment, SR-A expression assay, foam cell quantification by Oil Red O/Dil-oxLDL\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal KD and KO with multiple orthogonal mechanistic readouts, subcellular localization experimentally determined\",\n      \"pmids\": [\"33874983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Bidirectional alteration of CMPK2 expression (both silencing and constitutive overexpression) in macrophages disrupts mitochondrial physiology, causing membrane potential depolarization, elevated ROS, disturbed architecture, and increased glycolytic flux, resulting in pro-inflammatory gene expression (IL-1β, TNF-α, IL-8).\",\n      \"method\": \"siRNA knockdown, stable overexpression, mitochondrial membrane potential assay, ROS measurement, metabolic flux analysis, cytokine gene expression\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation with multiple organelle readouts, single lab\",\n      \"pmids\": [\"36451821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CBD decreases CMPK2 expression, which subsequently inhibits generation of oxidized mitochondrial DNA and suppresses NLRP3 inflammasome activation and pyroptosis; these effects are mediated mostly by PPARγ and partially by CB1 receptor.\",\n      \"method\": \"In vivo oral ulcer mouse model, gene expression analysis, CBD treatment, GSDMD and pyroptosis quantification, PPARγ and CB1 antagonist treatment\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue with pharmacological antagonists identifying upstream regulators, single lab\",\n      \"pmids\": [\"34269108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CMPK2 knockdown reduces NLRP3 inflammasome activation and related cytokines (IL-18, IL-1β, cleaved-caspase-1) in hepatic I/R injury; functional analysis shows CMPK2 is dispensable for AIM2 inflammasome but is required specifically for NLRP3 inflammasome activation in this context.\",\n      \"method\": \"CMPK2 knockdown in RAW264.7 cells, H/R model, AIM2 and NLRP3 inhibition, in vivo mouse hepatic I/R model, serum cytokine assay, ALT/AST measurement\",\n      \"journal\": \"Experimental and therapeutic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inflammasome-specific dissection using inhibitors, positive and negative controls, single lab\",\n      \"pmids\": [\"34659504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GATA6 directly targets CMPK2 as a transcriptional target gene; endothelial CMPK2 mediates monocyte adherence and migration, and pro-inflammatory macrophage foam cell formation through regulation of the CMPK2-NLRP3 pathway in atherosclerosis.\",\n      \"method\": \"Endothelial cell-specific Gata6 knockout mouse model, ChIP/target gene identification, AAV9-Icam2-driven Cmpk2-shRNA endothelial delivery, in vivo atherosclerosis lesion quantification\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct transcriptional target identification plus in vivo endothelial-specific rescue, multiple orthogonal approaches\",\n      \"pmids\": [\"37339559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FTO regulates CMPK2 expression in fibroblast-like synoviocytes; the FTO-CMPK2 pathway controls synovial inflammation through the mtDNA-mediated cGAS/STING pathway, affecting chondrocyte homeostasis in rheumatoid arthritis.\",\n      \"method\": \"FTO inhibition, gene knockdown, in vitro and in vivo RA models, cGAS/STING pathway analysis\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown and pharmacological inhibition, pathway placement via cGAS/STING readouts, single lab\",\n      \"pmids\": [\"38481810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 promotes microglial activation and neuroinflammation through the cGAS-STING signaling pathway; molecular docking experiments show CMPK2 stably binds to cGAS at the protein level, and cGAS knockdown mitigated CMPK2 overexpression-induced neuroinflammatory responses.\",\n      \"method\": \"LPS-treated BV2 and primary microglial cells, CMPK2 overexpression, cGAS knockdown, cytokine measurement, molecular docking\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — protein-level interaction by docking (not biochemical pulldown), functional rescue by cGAS KD supports pathway placement; single lab\",\n      \"pmids\": [\"40189684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 facilitates neuropathic pain by enhancing glycolysis in microglia, leading to increased lactate production that induces lactylation and deactivation of STING, thereby suppressing IFN-I production. RUNX1 was identified as a transcription factor that promotes CMPK2 upregulation in microglia.\",\n      \"method\": \"Cmpk2 deficiency (in vivo/in vitro), microglial overexpression, glycolysis flux assay, lactate measurement, STING lactylation assay, RUNX1 ChIP/promoter analysis\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel PTM (lactylation) mechanistic link with functional rescue, single lab, multiple methods\",\n      \"pmids\": [\"40252934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 interacts with TK2 in mitochondria; proximity labeling and immunofluorescence microscopy show TK2-CMPK2 co-localization, and their association prevents TMP from diffusing away, enabling compartmentalized two-step phosphorylation of thymidine to TDP within the mitochondrial matrix.\",\n      \"method\": \"Proximity labeling (BioID/equivalent), immunofluorescence microscopy, differential centrifugation fractionation, AZT-block assays in isolated mitochondria from rat heart, liver, kidney, brain\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — proximity labeling, fractionation, and functional enzyme assays across multiple tissues, mechanistic substrate channeling model validated\",\n      \"pmids\": [\"40967432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TRIM7, an E3 ubiquitin ligase, interacts with CMPK2 and negatively regulates its expression; TRIM7 overexpression mitigates inflammation and apoptosis in renal ischemia-reperfusion injury, and CMPK2 inhibition reverses the enhanced inflammation seen upon TRIM7 knockout.\",\n      \"method\": \"Co-immunoprecipitation, TRIM7 overexpression and knockout (in vivo and in vitro), CMPK2 inhibition rescue experiment, renal IRI model\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction with functional rescue experiment, single lab\",\n      \"pmids\": [\"41723894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Palmitic acid (PA) induces CMPK2 palmitoylation, which maintains its mitochondrial localization. ZDHHC20 catalyzes CMPK2 palmitoylation at cysteines 137 and 153; the thioesterase PPT1 removes this modification. Palmitoylated CMPK2 promotes production of ddhCTP and stabilizes MAVS, enhancing IFN-I production against RNA viruses. PPT1 deficiency restores CMPK2 palmitoylation and antiviral immunity.\",\n      \"method\": \"Palmitoylation assay, site-directed mutagenesis (Cys137/Cys153), ZDHHC20 and PPT1 knockdown/overexpression, mitochondrial localization imaging, MAVS co-IP, ddhCTP production assay, viral replication assay\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of palmitoylation sites plus writer/eraser identification with multiple orthogonal functional readouts, single lab but highly integrated\",\n      \"pmids\": [\"42011944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CMPK2 interacts with IKKα/β via its C-terminal domain, enhancing NF-κB phosphorylation and NLRP3 inflammasome activation. LPS induces CMPK2 translocation from cytoplasm to nucleus. The C-terminal domain is essential for pro-inflammatory NF-κB activity, whereas deletion of the N-terminal mitochondrial targeting sequence does not abolish this activity.\",\n      \"method\": \"Co-immunoprecipitation, dual-luciferase reporter assay, confocal microscopy (localization), domain deletion mutants, NF-κB pathway inhibitor (BAY11-7082) rescue, CMPK2 KO mice\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — co-IP plus domain mutagenesis plus pharmacological rescue, subcellular translocation documented, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"42208328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAT2 directly binds to the CMPK2 promoter and regulates its transcription; DSG interacts with STAT2 at Pro630 and Lys689 residues, inhibiting STAT2 phosphorylation and downstream CMPK2 expression, thereby suppressing mtDNA synthesis in macrophages.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), Stat2 knockdown/overexpression, surface plasmon resonance, Western blotting, mtDNA synthesis assay\",\n      \"journal\": \"Phytomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and SPR providing direct regulatory mechanism, single lab\",\n      \"pmids\": [\"41351988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IRF3 associates with the CMPK2 promoter and regulates CMPK2 transcription following mitochondrial DNA release and cGAS-STING pathway activation in the context of neuropathic pain, suggesting a feedback loop where CMPK2 upregulation further enhances mtDNA synthesis and innate immune activation.\",\n      \"method\": \"ChIP-seq/promoter analysis, single-cell RNA sequencing, AAV-mediated CMPK2 silencing, pharmacological inhibition with NDGA, in vivo nerve injury model, BV2 and primary microglia experiments\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP identifies IRF3 at CMPK2 promoter, functional rescue with genetic and pharmacological interventions, single lab\",\n      \"pmids\": [\"42174715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Dracorhodin (DP) covalently targets CMPK2 at lysine 265, inhibiting its kinase activity; this inhibition suppresses NLRP3 inflammasome activation via the LPS-induced CMPK2 pathway, and the anti-sepsis effect of DP is weakened in myeloid-specific Cmpk2-ablated mice.\",\n      \"method\": \"Affinity MS, quantitative lysine reactivity profiling, mutant binding tests, recombinant CMPK2 kinase assay (ADP-GLO), microscale thermophoresis (Kd measurement), myeloid-specific Cmpk2-KO mouse model\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — active site residue identified by MS-based covalent profiling, confirmed with mutagenesis, biochemical kinase assay, and in vivo cell-type-specific KO validation\",\n      \"pmids\": [\"37859535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cmpk2 deficiency in neutrophils impairs bacterial phagocytosis and reduces host survival during bacterial infection; the phagocytosis deficit is STING-dependent, as differences between WT and Cmpk2 KO neutrophils are eliminated by a STING inhibitor.\",\n      \"method\": \"Cmpk2 global KO mice, flow cytometry phagocytosis assay, STING inhibitor (C176) rescue, zebrafish embryo infection model, scRNA-seq analysis\",\n      \"journal\": \"Lung\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with pharmacological pathway rescue and independent zebrafish model, single lab\",\n      \"pmids\": [\"40616692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In chicken cells, Asp135 in the TMK (thymidylate kinase) catalytic domain of CMPK2 is critical for antiviral activity against AIV and NDV; CMPK2 expression is regulated by the MDA5/IFN-β pathway.\",\n      \"method\": \"Site-directed mutagenesis (Asp135), overexpression, MDA5 and IFN-β knockdown, viral replication assay in DF-1 cells\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — active-site mutagenesis with functional antiviral readout and upstream pathway knockdown, single lab\",\n      \"pmids\": [\"35633731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-202-5p (from BMSC-derived exosomes) directly targets CMPK2 mRNA; validated by dual-luciferase reporter assay and RNA immunoprecipitation. CMPK2 knockdown reverses the pro-pyroptosis effect of exosomal miR-202-5p inhibition in lung ischemia-reperfusion injury.\",\n      \"method\": \"Dual-luciferase reporter assay, RNA immunoprecipitation, CMPK2 knockdown, H/R cell model, pyroptosis marker quantification\",\n      \"journal\": \"The Kaohsiung journal of medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct miRNA-target validation by two orthogonal methods, functional rescue, single lab\",\n      \"pmids\": [\"37092308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CMPK2 promotes NLRP3 inflammasome activation via the mtDNA-cGAS-STING pathway in allergic rhinitis; depletion of mtDNA or inhibition of STING signaling reduces HDM-induced NLRP3 activation, and genetic knockout of CMPK2 or STING alleviates AR symptoms in mice.\",\n      \"method\": \"CMPK2 overexpression in HNEPCs, CMPK2 and STING genetic knockout mice, mtDNA depletion, STING inhibition, NLRP3/ASC/CASP1/IL-1β measurement\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO of both CMPK2 and STING with pathway epistasis, single lab\",\n      \"pmids\": [\"39799434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Hepatocyte-specific Cmpk2 deletion mitigates liver injury, inflammation, and fibrosis in MASH mice by suppressing NLRP3 inflammasome activation and hepatic pyroptosis; nordihydroguaiaretic acid (NDGA) was identified as a pharmacological CMPK2 inhibitor via surface plasmon resonance imaging coupled with enzyme activity detection.\",\n      \"method\": \"Hepatocyte-specific conditional Cmpk2 knockout mice, multiple murine MASH models, surface plasmon resonance imaging, NLRP3 inflammasome assays, pyroptosis quantification\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO in multiple disease models with biochemical inhibitor identification, multiple orthogonal methods\",\n      \"pmids\": [\"39855350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"RSAD2 (Viperin) and CMPK2 coordinately regulate EBV reactivation; depletion of CMPK2 led to reactivation of EBV lytic gene expression during latency. RSAD2 and CMPK2 have overlapping functions in regulating IFN-signaling pathways, oxidative phosphorylation, protein translation, and unfolded protein response. Both converge on control of GSDMD-associated pyroptosis and ATF-4-associated UPR despite distinct subcellular localizations (ER vs. mitochondria).\",\n      \"method\": \"RSAD2 and CMPK2 depletion in B-lymphocytes, transcriptomic analysis, ddhCTP production assay (RSAD2-dependent), metabolomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic depletion with transcriptomic and metabolomic readouts; preprint, not yet peer reviewed\",\n      \"pmids\": [\"41676616\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CMPK2 (cytidine/uridine monophosphate kinase 2) is a mitochondrially localized nucleotide kinase that phosphorylates CMP/UMP to CDP/UDP and is rate-limiting for de novo mitochondrial DNA (mtDNA) synthesis; its enzymatic activity drives mtDNA production and the generation of oxidized mtDNA, which activates the NLRP3 inflammasome and cGAS-STING pathway, linking mitochondrial nucleotide metabolism to innate immune signaling. CMPK2 is a type I interferon-stimulated gene that also exerts kinase-independent antiviral activity (via its N-terminal cysteine-rich domain) against flaviviruses and, in concert with Viperin-produced ddhCTP, inhibits coronavirus RNA-dependent RNA polymerases. Its mitochondrial retention is maintained by palmitoylation at Cys137/153 catalyzed by ZDHHC20 and removed by PPT1; physical interaction with TK2 within mitochondria enables substrate channeling for thymidine phosphorylation. Transcriptional regulation occurs via JAK/STAT2 and IRF1/IRF3 pathways, and TRIM7 (an E3 ubiquitin ligase) negatively regulates CMPK2 protein levels. Downstream inflammatory signaling involves CMPK2 interaction with IKKα/β through its C-terminal domain to activate NF-κB/NLRP3, while excessive CMPK2-driven glycolysis produces lactate that lactylates and inactivates STING, suppressing IFN-I in neuropathic pain contexts.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CMPK2 (cytidine/uridine monophosphate kinase 2) is a mitochondrially localized nucleotide kinase that is rate-limiting for de novo synthesis of mitochondrial DNA and the generation of oxidized mtDNA, coupling mitochondrial nucleotide metabolism to innate immune signaling [#0, #2]. Its kinase activity depends on conserved catalytic residues, including a TMK-domain aspartate and a covalently targetable lysine (Lys265), and produces newly synthesized mtDNA whose oxidized form drives NLRP3 inflammasome activation across diverse tissues and disease settings, including cerebral ischemia, hepatic injury, MASH, atherosclerosis, and allergic rhinitis [#1, #20, #25, #24, #10]. The same mtDNA output feeds the cGAS-STING axis: CMPK2 binds cGAS and amplifies STING-dependent neuroinflammation and inflammasome signaling [#12, #11, #24]. Beyond mtDNA, CMPK2 acts as a type I interferon-stimulated antiviral effector with both kinase-dependent and kinase-independent activities — its N-terminal cysteine-rich domain alone restricts flavivirus translation, while the catalytic domain works together with Viperin-produced ddhCTP to suppress coronavirus RNA-dependent RNA polymerase, with mitochondrial localization required for antiviral function [#3, #4]. In mitochondria CMPK2 physically associates with TK2 to compartmentalize two-step thymidine phosphorylation through substrate channeling [#14], and its mitochondrial retention is controlled by ZDHHC20-catalyzed palmitoylation at Cys137/153, reversed by PPT1, which also promotes ddhCTP production and MAVS stabilization for antiviral IFN-I [#16]. CMPK2 also has a kinase-independent pro-inflammatory arm: it interacts with IKK\\u03b1/\\u03b2 through its C-terminal domain to activate NF-\\u03baB and NLRP3 [#17]. Transcription is driven by JAK/STAT2, IRF1/IRF3, GATA6, and RUNX1, and protein levels are negatively regulated by the E3 ligase TRIM7 [#18, #19, #10, #13, #15]. Biallelic loss-of-function CMPK2 variants cause a mitochondrial deficiency with reduced mtDNA copy number, impaired ATP production, and abnormal cristae leading to brain calcification [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2021,\n      \"claim\": \"Establishing that CMPK2 is mitochondrial and rate-limiting for newly synthesized and oxidized mtDNA answered how a nucleotide kinase could control inflammasome activation, placing it upstream of NLRP3 via Ox-mtDNA.\",\n      \"evidence\": \"siRNA/CRISPR knockout, subcellular fractionation, and in vivo AAV knockdown in microglia/macrophages\",\n      \"pmids\": [\"34142025\", \"38701781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the enzymatic step or substrate specificity in vitro\", \"Mechanism of mtDNA oxidation not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that CMPK2 also resides in cytosolic fractions and that its IFN-\\u03b1 induction is JAK/Tyk2-dependent connected interferon signaling to CMPK2-driven mtROS, scavenger receptor expression, and foam cell formation.\",\n      \"evidence\": \"Subcellular fractionation, reciprocal KD/KO, JAK inhibitors, and foam cell assays in macrophages\",\n      \"pmids\": [\"33874983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the cytosolic pool versus mitochondrial pool not separated\", \"Direct STAT effector at the promoter not identified here\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Patient genetics combined with knockout/knock-in mice established CMPK2 as a Mendelian disease gene, showing loss-of-function causes mtDNA depletion, bioenergetic failure, and brain calcification.\",\n      \"evidence\": \"Cmpk2 KO and patient-mutation knock-in mice, patient PBMC transcriptomics, EM of neuronal mitochondria\",\n      \"pmids\": [\"36443312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue selectivity of the calcification phenotype unexplained\", \"Link between elevated inorganic phosphate and calcification not mechanistically closed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Domain mapping revealed CMPK2's antiviral activity is partly kinase-independent — the N-terminal cysteine-rich domain alone restricts flavivirus translation — distinguishing its enzymatic from non-enzymatic functions.\",\n      \"evidence\": \"Domain deletion and cysteine mutagenesis with Zika replication assays and mitochondrial targeting deletion\",\n      \"pmids\": [\"37075076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of NTD-mediated translation block unknown\", \"How mitochondrial localization enables a translation-targeting effect unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing CMPK2 cooperates with Viperin/ddhCTP to inhibit coronavirus RdRp clarified how its catalytic domain and a separate antiviral domain jointly enable broad antiviral restriction.\",\n      \"evidence\": \"Domain mutants, ddhCTP production and RdRp activity assays across multiple CoV genera; IFN/IRF1-dependent transcription\",\n      \"pmids\": [\"36930652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact biochemical product of CMPK2 feeding ddhCTP synthesis not fully defined\", \"Stoichiometry of CMPK2-Viperin cooperation unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of a covalent inhibitor binding Lys265 with a confirmed in vitro kinase assay pinned a catalytically essential residue and validated CMPK2 as a druggable anti-inflammatory target.\",\n      \"evidence\": \"Affinity MS, lysine reactivity profiling, recombinant kinase assay, MST, myeloid-specific Cmpk2-KO mice\",\n      \"pmids\": [\"37859535\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full active-site architecture and substrate-binding mode not structurally resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proximity labeling and functional channeling assays established a physical CMPK2-TK2 association that compartmentalizes thymidine phosphorylation, defining a concrete enzymatic partnership in the mitochondrial matrix.\",\n      \"evidence\": \"Proximity labeling, immunofluorescence, fractionation, and AZT-block assays in isolated mitochondria from multiple rat tissues\",\n      \"pmids\": [\"40967432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether channeling extends to cytidine/uridine substrates not addressed\", \"Structural basis of the TK2-CMPK2 interface unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Multiple disease-specific studies converged on a CMPK2 \\u2192 mtDNA \\u2192 cGAS-STING/NLRP3 inflammatory axis, including a direct CMPK2-cGAS binding model and STING-dependent epistasis in allergic and neutrophil contexts.\",\n      \"evidence\": \"Genetic KO of CMPK2 and STING, mtDNA depletion, STING inhibitors, molecular docking, and phagocytosis assays across AR, neuroinflammation, and bacterial infection models\",\n      \"pmids\": [\"40189684\", \"39799434\", \"40616692\", \"38481810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CMPK2-cGAS interaction rests on docking, not biochemical pulldown\", \"Whether CMPK2 binds cGAS directly or acts solely through mtDNA not separated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A glycolysis-lactylation branch was uncovered in which CMPK2-driven lactate lactylates and deactivates STING to suppress IFN-I, revealing context-dependent dual output that can both activate and dampen innate immunity.\",\n      \"evidence\": \"Cmpk2 deficiency/overexpression, glycolysis flux, STING lactylation assays, and RUNX1 promoter analysis in microglia\",\n      \"pmids\": [\"40252934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How CMPK2 enhances glycolytic flux mechanistically unresolved\", \"Tissue/context determinants of pro- versus anti-IFN outcome unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Transcription factor mapping (STAT2, IRF3, GATA6, RUNX1) defined the regulatory network that places CMPK2 downstream of interferon and stress signaling, including a feed-forward loop amplifying mtDNA synthesis.\",\n      \"evidence\": \"ChIP, SPR, knockdown/overexpression of STAT2/IRF3, GATA6 endothelial KO, and RUNX1 promoter analysis\",\n      \"pmids\": [\"41351988\", \"42174715\", \"37339559\", \"40252934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative hierarchy of these transcription factors across cell types not established\", \"Combinatorial promoter regulation unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Palmitoylation control resolved how CMPK2's mitochondrial retention and antiviral output are dynamically regulated, identifying ZDHHC20 as writer, PPT1 as eraser, and MAVS stabilization plus ddhCTP as downstream effects.\",\n      \"evidence\": \"Palmitoylation assay, Cys137/153 mutagenesis, ZDHHC20/PPT1 manipulation, MAVS co-IP, ddhCTP and viral assays\",\n      \"pmids\": [\"42011944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How palmitoylation status couples to kinase activity not defined\", \"Physiological signals driving dynamic depalmitoylation in vivo unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"A C-terminal-dependent CMPK2-IKK\\u03b1/\\u03b2 interaction and LPS-induced nuclear translocation established a kinase- and mitochondria-independent pro-inflammatory arm driving NF-\\u03baB/NLRP3.\",\n      \"evidence\": \"Co-IP, luciferase reporters, domain deletion mutants, NF-\\u03baB inhibitor rescue, confocal localization, CMPK2 KO mice\",\n      \"pmids\": [\"42208328\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear function of CMPK2 not characterized beyond translocation\", \"Direct IKK substrate/CMPK2 binding interface not mapped\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identifying TRIM7 as an E3 ligase that interacts with and negatively regulates CMPK2 added post-translational turnover as a control point limiting CMPK2-driven inflammation.\",\n      \"evidence\": \"Co-IP, TRIM7 overexpression/knockout, CMPK2 inhibition rescue in renal IRI\",\n      \"pmids\": [\"41723894\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitination of CMPK2 by TRIM7 and target residues not demonstrated\", \"Single Co-IP-based interaction without reciprocal validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CMPK2's distinct functional arms — mitochondrial nucleotide channeling, kinase-independent antiviral restriction, cytosolic/nuclear NF-\\u03baB activation, and glycolysis-driven STING lactylation — are coordinated within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating catalytic and non-catalytic domains\", \"Switch governing pro-inflammatory versus IFN-suppressive output undefined\", \"Direct substrate spectrum (CMP/UMP versus thymidine pathway) not biochemically delineated in human enzyme\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [14, 20, 22]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [14, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 3, 14, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 17]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 3, 4, 24]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 14]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 25, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TK2\", \"IKK\\u03b1/\\u03b2\", \"cGAS\", \"MAVS\", \"TRIM7\", \"ZDHHC20\", \"PPT1\", \"RSAD2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}