{"gene":"CAMK2G","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2018,"finding":"The CAMK2G p.Arg292Pro mutation acts as a gain-of-function by constitutively increasing phosphotransferase activity, leading to impaired neuronal maturation and impaired nuclear targeting of the CAMK2G isoform. Silencing the catalytic site reversed the pathogenic effect on neuronal maturation (but not nuclear targeting), indicating the pathogenic mechanism operates through constitutive cytosolic kinase activity rather than loss of nuclear localization.","method":"In vivo and in vitro assays including knockdown, catalytic-site silencing, phosphotransferase activity measurement, and neuronal maturation readouts","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (activity assay, knockdown rescue, nuclear targeting) in single lab; well-controlled mechanistic dissection","pmids":["30184290"],"is_preprint":false},{"year":2018,"finding":"Knockdown of CAMK2G in neurons results in precocious neuronal maturation, demonstrating an indispensable role for CAMK2G in restraining neurodevelopmental progression.","method":"In vitro knockdown with neuronal maturation phenotypic readout","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockdown with defined cellular phenotype, single lab, single method","pmids":["30184290"],"is_preprint":false},{"year":2022,"finding":"CAMK2G directly senses ROS (both basal and cisplatin-induced) and phosphorylates ITPKB at serine 174, directly regulating ITPKB activity to modulate cisplatin-induced ROS stress and maintain redox homeostasis in ovarian cancer cells.","method":"Pharmacologic inhibition, in vitro kinase assay, site-specific phosphorylation analysis (pS174), in vitro and in vivo cisplatin resistance assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct phosphorylation of substrate identified with site-specific readout and in vivo validation, single lab","pmids":["35039634"],"is_preprint":false},{"year":2022,"finding":"CAMK2G is an effector downstream of MPL-JAK2 signaling in myelofibrosis model cells; MPL signaling activates CAMK2G, and CAMK2G hetero-knockout decreases colony-forming capacity of primary bone marrow cells expressing MPL W515L.","method":"Genetic knockout (heterozygous), colony-forming assay, pharmacologic inhibition with berbamine, MF mouse model survival assay","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by KO and pharmacologic inhibition with defined cellular and in vivo phenotypes, single lab","pmids":["34521112"],"is_preprint":false},{"year":2023,"finding":"Loss of CAMK2G in knockout mice impairs motor function and innate behaviors (nest-building, marble burying) but has minimal impact on hippocampus-dependent learning and synaptic plasticity, indicating a specific role for CAMK2G in motor neurodevelopment rather than cognitive function.","method":"Camk2g knockout mouse behavioral characterization including motor tests, hippocampus-dependent learning tasks, and synaptic plasticity assays","journal":"Frontiers in neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with multiple behavioral readouts, single lab","pmids":["36685241"],"is_preprint":false},{"year":2024,"finding":"PCP4 binds calmodulin (CaM) and activates autophosphorylation of CAMK2G; the PCP4/CaM complex activates CAMK2G to promote neuronal differentiation (neurite outgrowth, upregulation of NF-H and MAP2) and inhibit migration and invasion in neuroblastoma cells.","method":"Co-immunoprecipitation (Co-IP), LC-MS/MS identification of CAMK2G as CaM target, CAMK2G knockdown with RNA sequencing, neurite outgrowth and migration assays","journal":"Journal of pediatric surgery","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP interaction, autophosphorylation readout, and KD phenotype with transcriptomic follow-up; single lab but multiple orthogonal methods","pmids":["39266386"],"is_preprint":false},{"year":1994,"finding":"The human CAMK2G (CAMKG) gene was chromosomally localized to chromosome 10q22 by somatic cell hybrid mapping and fluorescence in situ hybridization, and the mouse ortholog Camkg was mapped to chromosome 14.","method":"Somatic cell hybrid mapping panel, fluorescence in situ hybridization (FISH)","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — two orthogonal mapping methods, replicated for both human and mouse loci","pmids":["8287681"],"is_preprint":false},{"year":2002,"finding":"The human CAMK2G gene comprises 22 exons (ranging 43–230 bp) and was cloned and structurally characterized; CAMK2G is expressed in human pancreatic beta cells and is activated by glucose and secretagogues in a manner correlating with insulin secretion, mediating Ca2+-dependent exocytosis of insulin.","method":"PAC library cloning, vectorette PCR, SSCP variant screening, FISH (chromosome 10q22 localization)","journal":"Diabetologia","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genomic structure established by direct cloning; functional role in insulin secretion stated as prior knowledge cited without a new direct experiment in this paper","pmids":["12032636"],"is_preprint":false}],"current_model":"CAMK2G is a calcium/calmodulin-dependent serine/threonine kinase that transduces Ca2+ signals in neurons, cardiomyocytes, and other tissues: it restrains precocious neuronal maturation (loss causes premature differentiation), promotes neuronal differentiation and inhibits migration via a PCP4–calmodulin–CAMK2G autophosphorylation axis, phosphorylates ITPKB at S174 downstream of ROS sensing to maintain redox homeostasis, and acts as an effector of MPL-JAK2 signaling in myelofibrosis; pathogenic gain-of-function mutations (e.g., p.Arg292Pro) constitutively elevate phosphotransferase activity toward cytosolic targets and impair nuclear targeting, causing neurodevelopmental defects."},"narrative":{"mechanistic_narrative":"CAMK2G is a calcium/calmodulin-dependent serine/threonine kinase that transduces Ca2+ signals to control cell differentiation, redox homeostasis, and proliferative signaling across neuronal and non-neuronal tissues [PMID:30184290, PMID:35039634]. In neurons it restrains the pace of neurodevelopmental progression, since its loss drives precocious maturation [PMID:30184290], and a calmodulin-coupled mechanism in which PCP4 binds calmodulin to activate CAMK2G autophosphorylation promotes neuronal differentiation (neurite outgrowth, upregulation of NF-H and MAP2) while suppressing migration and invasion [PMID:39266386]. Genetic ablation in mice produces specific motor and innate-behavior deficits with little effect on hippocampus-dependent learning or synaptic plasticity, marking a selective role in motor neurodevelopment [PMID:36685241]. As a signaling effector, CAMK2G directly senses reactive oxygen species and phosphorylates ITPKB at serine 174 to maintain redox homeostasis and modulate cisplatin resistance in ovarian cancer cells [PMID:35039634], and it functions downstream of MPL-JAK2 signaling, where its activity supports the clonogenic capacity of MPL W515L-expressing bone marrow cells in myelofibrosis [PMID:34521112]. The gain-of-function mutation p.Arg292Pro constitutively elevates phosphotransferase activity and impairs nuclear targeting, causing neurodevelopmental defects through aberrant cytosolic kinase activity rather than loss of nuclear localization [PMID:30184290].","teleology":[{"year":1994,"claim":"Establishing the chromosomal location of CAMK2G provided the genomic anchor needed to link the gene to human phenotypes and orthologous mouse studies.","evidence":"Somatic cell hybrid mapping and FISH localizing the human gene to 10q22 and the mouse ortholog to chromosome 14","pmids":["8287681"],"confidence":"Medium","gaps":["No functional or mechanistic role assigned at this stage","Gene structure and isoforms not yet characterized"]},{"year":2002,"claim":"Cloning the full gene structure and noting expression in pancreatic beta cells extended CAMK2G's potential role to Ca2+-dependent secretory contexts.","evidence":"PAC library cloning, vectorette PCR, SSCP variant screening, and FISH localization","pmids":["12032636"],"confidence":"Low","gaps":["Insulin-secretion role stated from prior knowledge without a new direct experiment","No direct kinase or substrate data generated here"]},{"year":2018,"claim":"Linking CAMK2G to human neurodevelopmental disease and defining how a recurrent mutation acts answered whether disease arises from gain or loss of kinase function.","evidence":"Knockdown, catalytic-site silencing, phosphotransferase activity measurement, and neuronal maturation readouts for the p.Arg292Pro variant","pmids":["30184290"],"confidence":"Medium","gaps":["Cytosolic substrates mediating the maturation phenotype not identified","Mechanism of impaired nuclear targeting unresolved","Single-lab characterization"]},{"year":2022,"claim":"Identifying ITPKB-S174 as a direct substrate connected CAMK2G to ROS sensing and redox-homeostasis control in cancer cells.","evidence":"Pharmacologic inhibition, in vitro kinase assay, site-specific pS174 detection, and cisplatin-resistance assays in vitro and in vivo","pmids":["35039634"],"confidence":"Medium","gaps":["How CAMK2G directly senses ROS at the molecular level not defined","Generality of ITPKB phosphorylation beyond ovarian cancer untested"]},{"year":2022,"claim":"Placing CAMK2G downstream of MPL-JAK2 signaling established it as a proliferative effector in myelofibrosis.","evidence":"Heterozygous knockout, colony-forming assays, berbamine inhibition, and a myelofibrosis mouse survival model","pmids":["34521112"],"confidence":"Medium","gaps":["Direct biochemical link between JAK2 and CAMK2G activation not shown","Relevant downstream CAMK2G substrates in this context unidentified"]},{"year":2023,"claim":"Behavioral phenotyping of knockout mice distinguished CAMK2G's contribution to motor neurodevelopment from cognitive and synaptic functions.","evidence":"Camk2g knockout mouse motor tests, hippocampus-dependent learning tasks, and synaptic plasticity assays","pmids":["36685241"],"confidence":"Medium","gaps":["Cellular circuits underlying motor deficits not mapped","Molecular targets responsible for behavioral phenotype unknown"]},{"year":2024,"claim":"Defining the PCP4-calmodulin-CAMK2G axis provided a mechanism for how upstream regulators drive CAMK2G activation to promote differentiation and limit invasion.","evidence":"Co-IP, LC-MS/MS identification of CAMK2G as a CaM target, knockdown with RNA-seq, and neurite outgrowth/migration assays in neuroblastoma cells","pmids":["39266386"],"confidence":"Medium","gaps":["Direct phosphorylation substrates driving differentiation not identified","Co-IP not reciprocally validated for the PCP4-CAMK2G interaction","Single cell-line context"]},{"year":null,"claim":"The full repertoire of CAMK2G substrates and how Ca2+/calmodulin, ROS, and JAK2 inputs are integrated to govern nuclear versus cytosolic signaling remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking activation inputs to substrate selection","Determinants of nuclear targeting and its functional consequences unknown","Substrate set largely limited to ITPKB"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[],"complexes":[],"partners":["PCP4","CALM1","ITPKB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13555","full_name":"Calcium/calmodulin-dependent protein kinase type II subunit gamma","aliases":[],"length_aa":558,"mass_kda":62.6,"function":"Calcium/calmodulin-dependent protein kinase that functions autonomously after Ca(2+)/calmodulin-binding and autophosphorylation, and is involved in sarcoplasmic reticulum Ca(2+) transport in skeletal muscle and may function in dendritic spine and synapse formation and neuronal plasticity (PubMed:16690701). In slow-twitch muscles, is involved in regulation of sarcoplasmic reticulum (SR) Ca(2+) transport and in fast-twitch muscle participates in the control of Ca(2+) release from the SR through phosphorylation of the ryanodine receptor-coupling factor triadin (PubMed:16690701). In the central nervous system, it is involved in the regulation of neurite formation and arborization (PubMed:30184290). It may participate in the promotion of dendritic spine and synapse formation and maintenance of synaptic plasticity which enables long-term potentiation (LTP) and hippocampus-dependent learning. In response to interferon-gamma (IFN-gamma) stimulation, catalyzes phosphorylation of STAT1, stimulating the JAK-STAT signaling pathway (By similarity)","subcellular_location":"Sarcoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q13555/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CAMK2G","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000148660","cell_line_id":"CID001138","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":1}],"interactors":[{"gene":"CAMK2D","stoichiometry":10.0},{"gene":"BAIAP2","stoichiometry":10.0},{"gene":"CARM1","stoichiometry":10.0},{"gene":"CALM1","stoichiometry":0.2},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"CTTN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001138","total_profiled":1310},"omim":[{"mim_id":"618522","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL DOMINANT 59; MRD59","url":"https://www.omim.org/entry/618522"},{"mim_id":"611500","title":"MICRO RNA 219-1; MIR219-1","url":"https://www.omim.org/entry/611500"},{"mim_id":"610197","title":"MEDIATOR COMPLEX SUBUNIT 25; MED25","url":"https://www.omim.org/entry/610197"},{"mim_id":"602159","title":"CORONIN 2A; CORO2A","url":"https://www.omim.org/entry/602159"},{"mim_id":"602123","title":"CALCIUM/CALMODULIN-DEPENDENT PROTEIN KINASE II-GAMMA; CAMK2G","url":"https://www.omim.org/entry/602123"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Primary cilium tip","reliability":"Approved"},{"location":"Primary cilium transition zone","reliability":"Approved"},{"location":"Principal piece","reliability":"Approved"},{"location":"Cell Junctions","reliability":"Additional"},{"location":"Perinuclear theca","reliability":"Additional"},{"location":"Calyx","reliability":"Additional"},{"location":"Connecting piece","reliability":"Additional"},{"location":"End piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CAMK2G"},"hgnc":{"alias_symbol":[],"prev_symbol":["CAMKG"]},"alphafold":{"accession":"Q13555","domains":[{"cath_id":"3.30.200.20","chopping":"10-90","consensus_level":"high","plddt":91.1584,"start":10,"end":90},{"cath_id":"1.10.510.10","chopping":"95-300","consensus_level":"high","plddt":94.9647,"start":95,"end":300},{"cath_id":"3.10.450.50","chopping":"424-550","consensus_level":"high","plddt":85.7449,"start":424,"end":550}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13555","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13555-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13555-F1-predicted_aligned_error_v6.png","plddt_mean":78.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CAMK2G","jax_strain_url":"https://www.jax.org/strain/search?query=CAMK2G"},"sequence":{"accession":"Q13555","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13555.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13555/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13555"}},"corpus_meta":[{"pmid":"30184290","id":"PMC_30184290","title":"The intellectual disability-associated CAMK2G p.Arg292Pro mutation acts as a pathogenic gain-of-function.","date":"2018","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/30184290","citation_count":33,"is_preprint":false},{"pmid":"35039634","id":"PMC_35039634","title":"ROS-regulated phosphorylation of ITPKB by CAMK2G drives cisplatin resistance in ovarian cancer.","date":"2022","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/35039634","citation_count":26,"is_preprint":false},{"pmid":"12032636","id":"PMC_12032636","title":"Human calcium/calmodulin-dependent protein kinase II gamma gene (CAMK2G): cloning, genomic structure and detection of variants in subjects with type II diabetes.","date":"2002","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/12032636","citation_count":13,"is_preprint":false},{"pmid":"8287681","id":"PMC_8287681","title":"Localization of the CAMKG gene encoding gamma isoforms of multifunctional calcium/calmodulin-dependent protein kinase (CaM kinase) to human chromosome 10 band q22 and mouse chromosome 14.","date":"1994","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8287681","citation_count":8,"is_preprint":false},{"pmid":"34521112","id":"PMC_34521112","title":"CAMK2G is identified as a novel therapeutic target for myelofibrosis.","date":"2022","source":"Blood advances","url":"https://pubmed.ncbi.nlm.nih.gov/34521112","citation_count":4,"is_preprint":false},{"pmid":"36685241","id":"PMC_36685241","title":"Loss of CAMK2G affects intrinsic and motor behavior but has minimal impact on cognitive behavior.","date":"2023","source":"Frontiers in neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/36685241","citation_count":3,"is_preprint":false},{"pmid":"39266386","id":"PMC_39266386","title":"CAMK2G Promotes Neuronal Differentiation and Inhibits Migration in Neuroblastoma.","date":"2024","source":"Journal of pediatric surgery","url":"https://pubmed.ncbi.nlm.nih.gov/39266386","citation_count":3,"is_preprint":false},{"pmid":"40953646","id":"PMC_40953646","title":"CAMK2G in subcellular Ca2+ homeostasis: Molecular mechanisms and therapeutic targeting.","date":"2025","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40953646","citation_count":2,"is_preprint":false},{"pmid":"39921950","id":"PMC_39921950","title":"Identification of TRAF2, CAMK2G, and TIMM17A as biomarkers distinguishing mechanical asphyxia from sudden cardiac death base on 4D-DIA Proteomics: A pilot study.","date":"2025","source":"Journal of pharmaceutical and biomedical analysis","url":"https://pubmed.ncbi.nlm.nih.gov/39921950","citation_count":1,"is_preprint":false},{"pmid":"41534676","id":"PMC_41534676","title":"Integrated methylome and hydroxymethylome analysis identifies CAMK2G, NFATC4, and SFRP2 as TET1-regulated drivers of odontoblastic differentiation in human dental pulp cells.","date":"2026","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/41534676","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7005,"output_tokens":1922,"usd":0.024923,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8911,"output_tokens":2584,"usd":0.054578,"stage2_stop_reason":"end_turn"},"total_usd":0.079501,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"The CAMK2G p.Arg292Pro mutation acts as a gain-of-function by constitutively increasing phosphotransferase activity, leading to impaired neuronal maturation and impaired nuclear targeting of the CAMK2G isoform. Silencing the catalytic site reversed the pathogenic effect on neuronal maturation (but not nuclear targeting), indicating the pathogenic mechanism operates through constitutive cytosolic kinase activity rather than loss of nuclear localization.\",\n      \"method\": \"In vivo and in vitro assays including knockdown, catalytic-site silencing, phosphotransferase activity measurement, and neuronal maturation readouts\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (activity assay, knockdown rescue, nuclear targeting) in single lab; well-controlled mechanistic dissection\",\n      \"pmids\": [\"30184290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Knockdown of CAMK2G in neurons results in precocious neuronal maturation, demonstrating an indispensable role for CAMK2G in restraining neurodevelopmental progression.\",\n      \"method\": \"In vitro knockdown with neuronal maturation phenotypic readout\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockdown with defined cellular phenotype, single lab, single method\",\n      \"pmids\": [\"30184290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CAMK2G directly senses ROS (both basal and cisplatin-induced) and phosphorylates ITPKB at serine 174, directly regulating ITPKB activity to modulate cisplatin-induced ROS stress and maintain redox homeostasis in ovarian cancer cells.\",\n      \"method\": \"Pharmacologic inhibition, in vitro kinase assay, site-specific phosphorylation analysis (pS174), in vitro and in vivo cisplatin resistance assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct phosphorylation of substrate identified with site-specific readout and in vivo validation, single lab\",\n      \"pmids\": [\"35039634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CAMK2G is an effector downstream of MPL-JAK2 signaling in myelofibrosis model cells; MPL signaling activates CAMK2G, and CAMK2G hetero-knockout decreases colony-forming capacity of primary bone marrow cells expressing MPL W515L.\",\n      \"method\": \"Genetic knockout (heterozygous), colony-forming assay, pharmacologic inhibition with berbamine, MF mouse model survival assay\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by KO and pharmacologic inhibition with defined cellular and in vivo phenotypes, single lab\",\n      \"pmids\": [\"34521112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of CAMK2G in knockout mice impairs motor function and innate behaviors (nest-building, marble burying) but has minimal impact on hippocampus-dependent learning and synaptic plasticity, indicating a specific role for CAMK2G in motor neurodevelopment rather than cognitive function.\",\n      \"method\": \"Camk2g knockout mouse behavioral characterization including motor tests, hippocampus-dependent learning tasks, and synaptic plasticity assays\",\n      \"journal\": \"Frontiers in neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with multiple behavioral readouts, single lab\",\n      \"pmids\": [\"36685241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PCP4 binds calmodulin (CaM) and activates autophosphorylation of CAMK2G; the PCP4/CaM complex activates CAMK2G to promote neuronal differentiation (neurite outgrowth, upregulation of NF-H and MAP2) and inhibit migration and invasion in neuroblastoma cells.\",\n      \"method\": \"Co-immunoprecipitation (Co-IP), LC-MS/MS identification of CAMK2G as CaM target, CAMK2G knockdown with RNA sequencing, neurite outgrowth and migration assays\",\n      \"journal\": \"Journal of pediatric surgery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP interaction, autophosphorylation readout, and KD phenotype with transcriptomic follow-up; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"39266386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The human CAMK2G (CAMKG) gene was chromosomally localized to chromosome 10q22 by somatic cell hybrid mapping and fluorescence in situ hybridization, and the mouse ortholog Camkg was mapped to chromosome 14.\",\n      \"method\": \"Somatic cell hybrid mapping panel, fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two orthogonal mapping methods, replicated for both human and mouse loci\",\n      \"pmids\": [\"8287681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The human CAMK2G gene comprises 22 exons (ranging 43–230 bp) and was cloned and structurally characterized; CAMK2G is expressed in human pancreatic beta cells and is activated by glucose and secretagogues in a manner correlating with insulin secretion, mediating Ca2+-dependent exocytosis of insulin.\",\n      \"method\": \"PAC library cloning, vectorette PCR, SSCP variant screening, FISH (chromosome 10q22 localization)\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genomic structure established by direct cloning; functional role in insulin secretion stated as prior knowledge cited without a new direct experiment in this paper\",\n      \"pmids\": [\"12032636\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CAMK2G is a calcium/calmodulin-dependent serine/threonine kinase that transduces Ca2+ signals in neurons, cardiomyocytes, and other tissues: it restrains precocious neuronal maturation (loss causes premature differentiation), promotes neuronal differentiation and inhibits migration via a PCP4–calmodulin–CAMK2G autophosphorylation axis, phosphorylates ITPKB at S174 downstream of ROS sensing to maintain redox homeostasis, and acts as an effector of MPL-JAK2 signaling in myelofibrosis; pathogenic gain-of-function mutations (e.g., p.Arg292Pro) constitutively elevate phosphotransferase activity toward cytosolic targets and impair nuclear targeting, causing neurodevelopmental defects.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CAMK2G is a calcium/calmodulin-dependent serine/threonine kinase that transduces Ca2+ signals to control cell differentiation, redox homeostasis, and proliferative signaling across neuronal and non-neuronal tissues [#1, #2]. In neurons it restrains the pace of neurodevelopmental progression, since its loss drives precocious maturation [#1], and a calmodulin-coupled mechanism in which PCP4 binds calmodulin to activate CAMK2G autophosphorylation promotes neuronal differentiation (neurite outgrowth, upregulation of NF-H and MAP2) while suppressing migration and invasion [#5]. Genetic ablation in mice produces specific motor and innate-behavior deficits with little effect on hippocampus-dependent learning or synaptic plasticity, marking a selective role in motor neurodevelopment [#4]. As a signaling effector, CAMK2G directly senses reactive oxygen species and phosphorylates ITPKB at serine 174 to maintain redox homeostasis and modulate cisplatin resistance in ovarian cancer cells [#2], and it functions downstream of MPL-JAK2 signaling, where its activity supports the clonogenic capacity of MPL W515L-expressing bone marrow cells in myelofibrosis [#3]. The gain-of-function mutation p.Arg292Pro constitutively elevates phosphotransferase activity and impairs nuclear targeting, causing neurodevelopmental defects through aberrant cytosolic kinase activity rather than loss of nuclear localization [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing the chromosomal location of CAMK2G provided the genomic anchor needed to link the gene to human phenotypes and orthologous mouse studies.\",\n      \"evidence\": \"Somatic cell hybrid mapping and FISH localizing the human gene to 10q22 and the mouse ortholog to chromosome 14\",\n      \"pmids\": [\"8287681\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional or mechanistic role assigned at this stage\", \"Gene structure and isoforms not yet characterized\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Cloning the full gene structure and noting expression in pancreatic beta cells extended CAMK2G's potential role to Ca2+-dependent secretory contexts.\",\n      \"evidence\": \"PAC library cloning, vectorette PCR, SSCP variant screening, and FISH localization\",\n      \"pmids\": [\"12032636\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Insulin-secretion role stated from prior knowledge without a new direct experiment\", \"No direct kinase or substrate data generated here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linking CAMK2G to human neurodevelopmental disease and defining how a recurrent mutation acts answered whether disease arises from gain or loss of kinase function.\",\n      \"evidence\": \"Knockdown, catalytic-site silencing, phosphotransferase activity measurement, and neuronal maturation readouts for the p.Arg292Pro variant\",\n      \"pmids\": [\"30184290\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cytosolic substrates mediating the maturation phenotype not identified\", \"Mechanism of impaired nuclear targeting unresolved\", \"Single-lab characterization\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying ITPKB-S174 as a direct substrate connected CAMK2G to ROS sensing and redox-homeostasis control in cancer cells.\",\n      \"evidence\": \"Pharmacologic inhibition, in vitro kinase assay, site-specific pS174 detection, and cisplatin-resistance assays in vitro and in vivo\",\n      \"pmids\": [\"35039634\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How CAMK2G directly senses ROS at the molecular level not defined\", \"Generality of ITPKB phosphorylation beyond ovarian cancer untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placing CAMK2G downstream of MPL-JAK2 signaling established it as a proliferative effector in myelofibrosis.\",\n      \"evidence\": \"Heterozygous knockout, colony-forming assays, berbamine inhibition, and a myelofibrosis mouse survival model\",\n      \"pmids\": [\"34521112\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link between JAK2 and CAMK2G activation not shown\", \"Relevant downstream CAMK2G substrates in this context unidentified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Behavioral phenotyping of knockout mice distinguished CAMK2G's contribution to motor neurodevelopment from cognitive and synaptic functions.\",\n      \"evidence\": \"Camk2g knockout mouse motor tests, hippocampus-dependent learning tasks, and synaptic plasticity assays\",\n      \"pmids\": [\"36685241\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular circuits underlying motor deficits not mapped\", \"Molecular targets responsible for behavioral phenotype unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defining the PCP4-calmodulin-CAMK2G axis provided a mechanism for how upstream regulators drive CAMK2G activation to promote differentiation and limit invasion.\",\n      \"evidence\": \"Co-IP, LC-MS/MS identification of CAMK2G as a CaM target, knockdown with RNA-seq, and neurite outgrowth/migration assays in neuroblastoma cells\",\n      \"pmids\": [\"39266386\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation substrates driving differentiation not identified\", \"Co-IP not reciprocally validated for the PCP4-CAMK2G interaction\", \"Single cell-line context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full repertoire of CAMK2G substrates and how Ca2+/calmodulin, ROS, and JAK2 inputs are integrated to govern nuclear versus cytosolic signaling remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model linking activation inputs to substrate selection\", \"Determinants of nuclear targeting and its functional consequences unknown\", \"Substrate set largely limited to ITPKB\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0000000\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PCP4\", \"CALM1\", \"ITPKB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}