{"gene":"CAMTA1","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2011,"finding":"The WWTR1-CAMTA1 (TAZ-CAMTA1) fusion gene is generated by a recurrent t(1;3)(p36.3;q25) chromosomal translocation in epithelioid hemangioendothelioma (EHE). RT-PCR confirmed the fusion transcript in EHE from bone, soft tissue, and visceral locations, establishing it as a consistent molecular abnormality specific to this tumor type.","method":"FISH positional cloning, RT-PCR","journal":"Genes, chromosomes & cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — confirmed by multiple orthogonal molecular methods (FISH + RT-PCR) across multiple anatomic sites in a systematic cohort; replicated extensively in subsequent independent studies","pmids":["21584898"],"is_preprint":false},{"year":2015,"finding":"The TAZ-CAMTA1 (TC) fusion protein localizes constitutively to the nucleus (escaping the cytoplasmic retention and degradation normally imposed by LATS1/2 phosphorylation of TAZ), activates a TAZ-like transcriptional program, confers resistance to anoikis, and causes oncogenic transformation of cells. The oncogenic activity depends on nuclear localization driven by loss of the LATS-regulated phosphodegron in the TAZ moiety.","method":"Expression of fusion construct in cell lines, anoikis resistance assay, transcriptional reporter assays, subcellular fractionation/localization","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays in a single focused mechanistic study, replicated in concept by subsequent independent mouse model and cell-line studies","pmids":["25961935"],"is_preprint":false},{"year":2021,"finding":"TAZ-CAMTA1 and YAP-TFE3 fusion oncoproteins both interact with YEATS2 and ZZZ3, components of the ATAC histone acetyltransferase complex, as identified by a proteomic/genetic screen. The fusions drive a unique transcriptome by simultaneously hyperactivating a TEAD-based transcriptional program and modulating chromatin via the ATAC complex.","method":"Proteomic/genetic screen (Co-IP/MS), integrative next-generation sequencing (ChIP-seq, RNA-seq) in human and murine cell lines","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP/MS identification of ATAC complex interaction validated by multiple orthogonal genomic and functional methods in two independent cell systems","pmids":["33913810"],"is_preprint":false},{"year":2021,"finding":"Conditional knock-in of Wwtr1-Camta1 to the endogenous Wwtr1 locus in mice is sufficient to drive EHE tumor formation exclusively in endothelial cells, demonstrating that TAZ-CAMTA1 is the key oncogenic driver. Expression in endothelial cells recapitulates the human disease histologically, immunohistochemically, and genetically.","method":"Conditional knock-in mouse model (Cre-activated Wwtr1-Camta1 allele targeted to Wwtr1 locus), histological and molecular characterization","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic sufficiency demonstrated using endogenous-locus conditional knock-in model with comprehensive characterization; independently confirmed in a parallel mouse model study (PMID 33766984)","pmids":["33766982"],"is_preprint":false},{"year":2021,"finding":"TAZ-CAMTA1 expression in endothelial cells initiates an angiogenic and regenerative-like transcriptional program. Disruption of the TAZ-CAMTA1–TEAD interaction (by dominant-negative TEAD expression in vivo) inhibits TAZ-CAMTA1-mediated vascular tumor formation, establishing TEAD as a required transcriptional effector of the fusion oncoprotein.","method":"Endothelial-specific transgenic mouse model, dominant-negative TEAD in vivo rescue experiment, transcriptome profiling","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via dominant-negative TEAD in vivo establishes pathway dependence; complemented by full transcriptome analysis and independent mouse model replication","pmids":["33766984"],"is_preprint":false},{"year":2022,"finding":"CTGF is a tumorigenic transcriptional target of the TAZ-CAMTA1 fusion. CTGF binds integrin αIIbβ3 to sustain anchorage-independent proliferation of TC-transformed cells, and acts upstream of Ras-MAPK signaling. Pharmacologic MAPK inhibition (trametinib) or CTGF knockdown abrogates TC-driven growth in vitro and in xenograft models.","method":"NIH3T3 cell transformation model, soft-agar/suspension growth assays, CTGF knockdown, xenograft model, pharmacologic MAPK inhibition (trametinib, PD0325901)","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetic knockdown, pharmacologic inhibition, in vitro and in vivo validation) in a single focused mechanistic study","pmids":["35443056"],"is_preprint":false},{"year":2023,"finding":"Upon TAZ-CAMTA1 expression in primary endothelial cells, cells rapidly enter a hypertranscription state, triggering DNA damage, S-phase arrest, and impaired homologous recombination (reduced BRCA1 and RAD51 foci), leading to senescence. Loss of CDKN2A bypasses this senescence to allow uncontrolled growth, providing a mechanistic basis for CDKN2A as the most common secondary mutation in EHE.","method":"Doxycycline-inducible TAZ-CAMTA1 in primary endothelial cells, DNA damage foci (γH2AX, BRCA1, RAD51) immunofluorescence, cell cycle analysis, senescence assays, Cdkn2a knockout mouse model","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal cellular and genetic methods (inducible expression, DNA damage markers, cell cycle analysis, in vivo Cdkn2a KO) establish the mechanistic sequence","pmids":["37980390"],"is_preprint":false},{"year":2023,"finding":"Loss of CDKN2A in the context of the TAZ-CAMTA1 (TC) fusion in endothelial cells produces more aggressive EHE with earlier morbidity/mortality and enhanced tumor cell proliferation in a conditional mouse model, establishing CDKN2A loss as a cooperating oncogenic event with TC. EHE cell lines derived from these tumors are addicted to the TC oncoprotein.","method":"Conditional mouse model (TC allele + Cdkn2a knockout + endothelial Cre), single-cell RNA-seq, ex vivo cell line derivation and xenograft","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis with conditional double-mutant mouse, confirmed by cell line characterization and xenograft","pmids":["36598859"],"is_preprint":false},{"year":2011,"finding":"CAMTA1 functions as a tumor suppressor in neuroblastoma: ectopic CAMTA1 expression slowed cell proliferation (increased G1/G0), inhibited anchorage-independent colony formation, suppressed xenograft growth, and induced neurite-like processes and neuronal differentiation markers. Transcriptome analysis identified 683 CAMTA1-regulated genes enriched for neuronal function and differentiation. Retinoic acid and other differentiation stimuli upregulated CAMTA1 expression.","method":"Inducible ectopic CAMTA1 expression in neuroblastoma cell lines, cell cycle analysis, soft-agar colony assay, xenograft model, transcriptome analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays (in vitro proliferation, colony formation, in vivo xenograft) plus transcriptome profiling in a single focused study","pmids":["21385898"],"is_preprint":false},{"year":2011,"finding":"CAMTA1 is a direct target of miR-9/9* and miR-17 in glioblastoma stem cells. CAMTA1 induces expression of the anti-proliferative cardiac hormone NPPA, reduces neurosphere formation, and suppresses tumor growth in nude mice, supporting a tumor suppressor function. miR-9/9* inhibition reduced neurosphere formation and stimulated differentiation.","method":"miRNA target validation (miR-9/9*, miR-17 → CAMTA1), CAMTA1 overexpression in glioblastoma stem cells, neurosphere formation assay, nude mouse tumor growth assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct miRNA targeting established with functional rescue in vitro and in vivo, multiple orthogonal approaches in single focused study","pmids":["21857646"],"is_preprint":false},{"year":2014,"finding":"Global or nervous-system-specific deletion of CAMTA1 in mice causes severe ataxia with Purkinje cell degeneration and cerebellar atrophy. Gene-expression analysis identified a large set of neuronal genes dysregulated in CAMTA1-mutant brains, and a consensus CAMTA-binding DNA sequence was determined and associated with many of these genes, establishing CAMTA1 as a direct transcriptional regulator required for Purkinje cell function and survival.","method":"Conditional knockout mouse (global and nervous-system-specific), gene-expression analysis, consensus DNA binding motif determination","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function mouse genetics with defined cellular phenotype plus transcriptome and DNA-binding motif analysis; replicated by clinical genetics literature","pmids":["25049392"],"is_preprint":false},{"year":2016,"finding":"Acute hippocampal knockdown of CAMTA1 (but not CAMTA2) in adult mice impairs contextual fear conditioning and object-place recognition (long-term memory), without affecting short-term memory or neuronal morphology. Gene expression profiling revealed CAMTA1-dependent regulation of genes related to synaptic transmission and neuronal excitability, and patch-clamp recordings confirmed CAMTA1-dependent electrophysiological changes.","method":"shRNA knockdown in adult mouse hippocampus, behavioral memory tests (fear conditioning, object-place recognition), transcriptome profiling, patch-clamp electrophysiology","journal":"Learning & memory (Cold Spring Harbor, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function with isoform specificity (CAMTA1 vs CAMTA2), defined behavioral phenotype, complemented by transcriptome and electrophysiology","pmids":["27194798"],"is_preprint":false},{"year":2016,"finding":"CAMTA1 knockdown in pancreatic beta cells (INS-1 832/13 and Wistar rat islets) reduced miR-212/miR-132 promoter activity and expression, decreased insulin secretion and voltage-dependent Ca2+ currents, and altered insulin content. CAMTA1 protein physically interacts with the homeodomain transcription factor Nkx2-2. These results place CAMTA1 as a regulator of the miR-212/miR-132 cluster and of multiple steps in beta-cell insulin secretion.","method":"Camta1 siRNA knockdown in INS-1 cells and rat islets, miR-212/miR-132 promoter-reporter assay, insulin secretion/content assays, patch-clamp (Ca2+ currents), Co-IP (CAMTA1–Nkx2-2 interaction)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for protein interaction plus multiple functional readouts (promoter activity, secretion, electrophysiology) in a single lab; no independent replication","pmids":["27402838"],"is_preprint":false},{"year":2012,"finding":"Ca2+-dependent upregulation of CAMTA1 in mesenchymal stem cells co-cultured with cardiomyocytes precedes activation of a myocardial gene program. CAMTA1 loss-of-function minimized cardiac gene program activation in stem cells, establishing CAMTA1 as an early Ca2+-dependent intermediate required for cardiomyocyte-lineage commitment.","method":"Co-culture of mesenchymal stem cells with neonatal cardiomyocytes, Ca2+ imaging, CAMTA1 loss-of-function (knockdown), cardiac gene expression profiling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined phenotypic readout (cardiac gene program activation), Ca2+ imaging mechanistic link; single lab, limited orthogonal validation","pmids":["22715383"],"is_preprint":false},{"year":2020,"finding":"CAMTA1 overexpression in glioma cells inhibited cell growth, migration, invasion, and cell cycle progression, and enhanced temozolomide-induced apoptosis. Overexpression decreased ITGA5, ITGB1, p-AKT, p-FAK, and Myc protein levels, placing CAMTA1 as a suppressor upstream of integrin/AKT/FAK/Myc signaling in glioma.","method":"CAMTA1 overexpression in glioma cell lines, cell viability/migration/invasion assays, flow cytometry cell cycle/apoptosis analysis, Western blot for signaling proteins, xenograft model","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple in vitro and in vivo functional assays with signaling protein readouts; single lab, no epistasis or rescue experiments to confirm pathway placement","pmids":["33316386"],"is_preprint":false},{"year":2022,"finding":"CAMTA1 forms a multi-protein complex with PPP3CA (calcineurin A) and NFATc4. CAMTA1 and PPP3CA competitively bind to NFATc4; CAMTA1 knockdown promotes PPP3CA-mediated dephosphorylation and activation of NFATc4, leading to upregulation of NFATc4 target genes, increased proliferation/invasion, and oxaliplatin resistance in colorectal cancer cells.","method":"Co-IP (CAMTA1–PPP3CA–NFATc4 complex), CAMTA1 and PPP3CA knockdown, NFATc4 phosphorylation/expression assays, cell proliferation/invasion/apoptosis assays, xenograft model","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for complex identification, multiple functional readouts and in vivo validation; single lab, no independent replication","pmids":["35332122"],"is_preprint":false},{"year":2013,"finding":"lncCAMTA1 physically associates with the CAMTA1 promoter, induces a repressive chromatin structure, and thereby inhibits CAMTA1 transcription in hepatocellular carcinoma. CAMTA1 is required for the effects of lncCAMTA1 on HCC cell proliferation and cancer stem cell-like properties.","method":"ChIP (chromatin association of lncCAMTA1 at CAMTA1 promoter), lncCAMTA1 overexpression/knockdown, CAMTA1 rescue experiments, in vitro and in vivo functional assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP establishes promoter association; CAMTA1 rescue confirms epistatic relationship; single lab","pmids":["27669232"],"is_preprint":false},{"year":2022,"finding":"CAMTA1 knockout in SH-SY5Y cells increased cyclin D1 (CCND1) expression under oxygen-glucose deprivation/reoxygenation (OGD/R) conditions, and RNA-seq revealed pathways involved in cellular proliferation and cell cycle enriched in CAMTA1 KO cells, establishing CAMTA1 as a regulator of cyclin D1 and cell-cycle progression in the context of ischemia-reperfusion injury.","method":"CAMTA1 CRISPR knockout in SH-SY5Y cells, RNA-seq, CCND1 protein/mRNA quantification under OGD/R model, methylation analysis (850K BeadChip)","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean CRISPR KO with transcriptome readout and CCND1 protein validation under a defined stress model; single lab, no rescue","pmids":["36159397"],"is_preprint":false},{"year":2003,"finding":"Bioinformatic characterization of the CAMTA1 protein domain structure identified: a CG-1 domain, TIG domain, ankyrin repeats, and IQ motifs (calmodulin-binding), defining CAMTA1 as a member of the calmodulin-binding transcription activator (CAMTA) family. KIAA0833 was identified as the representative human CAMTA1 cDNA. Mouse Camta1 was determined to share 94.1% amino acid identity with human CAMTA1.","method":"Bioinformatics/in silico domain analysis, cDNA sequence assembly","journal":"International journal of oncology","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational prediction only; no experimental functional validation of domain activities in this paper","pmids":["12964007"],"is_preprint":false}],"current_model":"CAMTA1 is a calmodulin-binding transcription activator (containing CG-1, TIG, ankyrin repeat, and IQ domains) that functions as a calcium-sensitive transcriptional regulator required for Purkinje cell survival and long-term memory formation in the nervous system; in cancer, a recurrent t(1;3) translocation fuses WWTR1 (TAZ) to CAMTA1, producing a constitutively nuclear TAZ-CAMTA1 oncoprotein that hyperactivates TEAD-dependent transcription, recruits the ATAC histone acetyltransferase complex, drives CTGF/Ras-MAPK signaling, induces hypertranscription and genomic instability, and is sufficient to initiate epithelioid hemangioendothelioma in endothelial cells, with CDKN2A loss cooperating to bypass fusion-induced senescence and accelerate tumor progression."},"narrative":{"mechanistic_narrative":"CAMTA1 is a calcium-responsive transcriptional regulator with dual roles as a developmental/neuronal transcription factor and, when disrupted by chromosomal rearrangement, as the substrate for a potent oncogenic fusion [PMID:25049392, PMID:21584898]. In the nervous system, loss of CAMTA1 in mice causes Purkinje cell degeneration, cerebellar atrophy, and dysregulation of large neuronal gene sets, and a consensus CAMTA-binding DNA motif links it directly to these targets, establishing CAMTA1 as a transcriptional regulator required for Purkinje cell survival [PMID:25049392]; acute hippocampal knockdown selectively impairs long-term memory and alters genes controlling synaptic transmission and neuronal excitability [PMID:27194798]. Across multiple tumor contexts CAMTA1 acts as a tumor suppressor: it slows proliferation, drives neuronal/neurosphere differentiation, and suppresses xenograft growth in neuroblastoma and glioblastoma stem cells [PMID:21385898, PMID:21857646]. Its activity intersects calcium signaling through participation in a complex with the calcineurin subunit PPP3CA and NFATc4, where CAMTA1 competes with PPP3CA for NFATc4 binding to restrain NFAT activation [PMID:35332122]. The recurrent t(1;3) translocation fuses WWTR1 (TAZ) to CAMTA1, generating a fusion oncoprotein that escapes LATS1/2-imposed cytoplasmic retention and is constitutively nuclear, activating a TAZ-like, TEAD-dependent transcriptional program and transforming cells [PMID:25961935, PMID:33766984]; this fusion is sufficient to initiate epithelioid hemangioendothelioma specifically in endothelial cells in vivo [PMID:33766982]. Mechanistically the fusion recruits the ATAC histone acetyltransferase complex via YEATS2 and ZZZ3 to remodel chromatin alongside TEAD activation [PMID:33913810], induces the tumorigenic target CTGF, which signals through integrin αIIbβ3 and upstream of Ras-MAPK [PMID:35443056], and drives a hypertranscription state producing DNA damage and senescence that CDKN2A loss bypasses to accelerate tumorigenesis [PMID:37980390, PMID:36598859]. CAMTA1 domain architecture (CG-1, TIG, ankyrin repeats, calmodulin-binding IQ motifs) defines it as a calmodulin-binding transcription activator family member [PMID:12964007].","teleology":[{"year":2003,"claim":"Before functional studies, the question was what kind of protein CAMTA1 is; domain analysis defined it as a calmodulin-binding transcription activator, framing a calcium-sensitive transcription factor.","evidence":"in silico domain analysis and cDNA assembly identifying CG-1, TIG, ankyrin, and IQ domains","pmids":["12964007"],"confidence":"Low","gaps":["Computational prediction only; no experimental validation of domain activities","Calmodulin binding to IQ motifs not functionally tested","No demonstration of transcriptional activity"]},{"year":2011,"claim":"It was unknown whether CAMTA1 has a physiological growth-control role; ectopic expression showed it suppresses proliferation and drives neuronal differentiation, establishing a tumor-suppressor function.","evidence":"inducible CAMTA1 expression in neuroblastoma cells with cell cycle, soft-agar, xenograft, and transcriptome readouts; miRNA targeting and NPPA induction in glioblastoma stem cells","pmids":["21385898","21857646"],"confidence":"High","gaps":["Direct transcriptional targets driving the phenotype not fully defined","Calcium-dependence of this activity not addressed"]},{"year":2011,"claim":"The molecular lesion behind epithelioid hemangioendothelioma was unknown; identification of the recurrent t(1;3) WWTR1-CAMTA1 fusion established a tumor-specific molecular abnormality.","evidence":"FISH positional cloning and RT-PCR across multiple anatomic sites in an EHE cohort","pmids":["21584898"],"confidence":"High","gaps":["Did not establish whether the fusion is causal or how it transforms cells","Functional contribution of the CAMTA1 moiety unresolved"]},{"year":2014,"claim":"The in vivo role of CAMTA1 in the nervous system was unclear; conditional knockout revealed it is required for Purkinje cell survival and directly regulates neuronal genes via a defined DNA motif.","evidence":"global and nervous-system-specific knockout mice with gene-expression analysis and consensus binding-motif determination","pmids":["25049392"],"confidence":"High","gaps":["Direct genomic occupancy at endogenous targets not mapped by ChIP","Role of calmodulin/calcium in this regulation not tested"]},{"year":2015,"claim":"Whether the WWTR1-CAMTA1 fusion is oncogenic and by what mechanism was open; the fusion was shown to be constitutively nuclear, escaping LATS-regulated degradation, and to transform cells via a TAZ-like program.","evidence":"fusion expression in cell lines with subcellular fractionation, anoikis assays, and transcriptional reporters","pmids":["25961935"],"confidence":"High","gaps":["Required transcriptional cofactors not yet identified","In vivo sufficiency not demonstrated in this study"]},{"year":2021,"claim":"It was unknown whether the fusion alone causes EHE and which effectors it requires; endogenous-locus knock-in showed endothelial-specific tumor formation, and dominant-negative TEAD established TEAD as a required effector, while proteomics identified ATAC complex recruitment.","evidence":"conditional knock-in and endothelial transgenic mouse models with dominant-negative TEAD rescue; Co-IP/MS and ChIP-seq/RNA-seq identifying YEATS2/ZZZ3 (ATAC complex)","pmids":["33766982","33766984","33913810"],"confidence":"High","gaps":["Mechanism by which the fusion recruits ATAC not structurally defined","Cell-of-origin specificity for endothelium not fully explained"]},{"year":2022,"claim":"The downstream effectors linking fusion-driven transcription to tumor growth were unclear; CTGF was identified as a tumorigenic target acting via integrin αIIbβ3 and upstream of Ras-MAPK, defining a druggable axis.","evidence":"NIH3T3 transformation, CTGF knockdown, xenografts, and pharmacologic MAPK inhibition (trametinib)","pmids":["35443056"],"confidence":"High","gaps":["Direct binding of fusion to the CTGF promoter not shown","Relevance of integrin αIIbβ3 in patient tumors not established"]},{"year":2023,"claim":"Why CDKN2A loss is the most common secondary mutation in EHE was unknown; the fusion was shown to induce hypertranscription, DNA damage, impaired homologous recombination, and senescence, which CDKN2A loss bypasses to accelerate tumorigenesis.","evidence":"inducible fusion in primary endothelial cells with DNA-damage foci, cell-cycle and senescence assays; conditional fusion + Cdkn2a knockout mouse and scRNA-seq","pmids":["37980390","36598859"],"confidence":"High","gaps":["Source of the hypertranscription-induced DNA damage not mechanistically resolved","Other cooperating events beyond CDKN2A not surveyed"]},{"year":2022,"claim":"Whether wild-type CAMTA1 intersects calcium signaling at the protein level was unaddressed; it was shown to form a complex with calcineurin (PPP3CA) and NFATc4, competing with PPP3CA to restrain NFAT activation.","evidence":"Co-IP of the CAMTA1-PPP3CA-NFATc4 complex with knockdown, NFATc4 phosphorylation assays, and xenografts in colorectal cancer cells","pmids":["35332122"],"confidence":"Medium","gaps":["Single Co-IP-based complex without reciprocal/structural validation","Not independently replicated","Relationship to CAMTA1 transcriptional activity unclear"]},{"year":null,"claim":"How CAMTA1's calmodulin-binding/calcium-sensing architecture mechanistically couples to its transcriptional output, and whether the wild-type protein's tumor-suppressor and the fusion's oncogenic programs share regulatory logic, remains unresolved.","evidence":"no single study in the corpus directly tests calcium/calmodulin control of CAMTA1 transcriptional activity","pmids":[],"confidence":"Low","gaps":["Calcium/calmodulin dependence of CAMTA1 transcription not experimentally demonstrated","Genome-wide direct targets of wild-type CAMTA1 not mapped","Structural basis of the fusion-ATAC-TEAD assembly unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10,8,4]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[10]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10,8,4]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[10,11]}],"complexes":["ATAC histone acetyltransferase complex","CAMTA1-PPP3CA-NFATc4 complex"],"partners":["WWTR1","TEAD","YEATS2","ZZZ3","PPP3CA","NFATC4","NKX2-2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6Y1","full_name":"Calmodulin-binding transcription activator 1","aliases":[],"length_aa":1673,"mass_kda":183.7,"function":"Transcriptional activator","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9Y6Y1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CAMTA1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CAMTA1","total_profiled":1310},"omim":[{"mim_id":"614827","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY C, MEMBER 11; DNAJC11","url":"https://www.omim.org/entry/614827"},{"mim_id":"614756","title":"CEREBELLAR DYSFUNCTION WITH VARIABLE COGNITIVE AND BEHAVIORAL ABNORMALITIES; CECBA","url":"https://www.omim.org/entry/614756"},{"mim_id":"611508","title":"CALMODULIN-BINDING TRANSCRIPTION ACTIVATOR 2; CAMTA2","url":"https://www.omim.org/entry/611508"},{"mim_id":"611501","title":"CALMODULIN-BINDING TRANSCRIPTION ACTIVATOR 1; CAMTA1","url":"https://www.omim.org/entry/611501"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CAMTA1"},"hgnc":{"alias_symbol":["KIAA0833"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6Y1","domains":[{"cath_id":"-","chopping":"52-186_198-224","consensus_level":"medium","plddt":83.5191,"start":52,"end":224},{"cath_id":"2.60.40.10","chopping":"876-953","consensus_level":"high","plddt":91.1372,"start":876,"end":953},{"cath_id":"1.25.40.20","chopping":"975-986_1060-1156","consensus_level":"medium","plddt":87.3282,"start":975,"end":1156},{"cath_id":"1.20.5","chopping":"1521-1606","consensus_level":"medium","plddt":84.1549,"start":1521,"end":1606}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6Y1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6Y1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6Y1-F1-predicted_aligned_error_v6.png","plddt_mean":50.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CAMTA1","jax_strain_url":"https://www.jax.org/strain/search?query=CAMTA1"},"sequence":{"accession":"Q9Y6Y1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6Y1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6Y1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6Y1"}},"corpus_meta":[{"pmid":"21584898","id":"PMC_21584898","title":"A novel WWTR1-CAMTA1 gene fusion is a consistent abnormality in epithelioid hemangioendothelioma of different anatomic sites.","date":"2011","source":"Genes, chromosomes & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21584898","citation_count":397,"is_preprint":false},{"pmid":"26414223","id":"PMC_26414223","title":"Nuclear Expression of CAMTA1 Distinguishes Epithelioid Hemangioendothelioma From Histologic Mimics.","date":"2016","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26414223","citation_count":194,"is_preprint":false},{"pmid":"15709179","id":"PMC_15709179","title":"Allelic losses at 1p36 and 19q13 in gliomas: correlation with histologic classification, definition of a 150-kb minimal deleted region on 1p36, and evaluation of CAMTA1 as a candidate tumor suppressor gene.","date":"2005","source":"Clinical cancer research : an official journal of the American Association for Cancer 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fusion gene is generated by a recurrent t(1;3)(p36.3;q25) chromosomal translocation in epithelioid hemangioendothelioma (EHE). RT-PCR confirmed the fusion transcript in EHE from bone, soft tissue, and visceral locations, establishing it as a consistent molecular abnormality specific to this tumor type.\",\n      \"method\": \"FISH positional cloning, RT-PCR\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — confirmed by multiple orthogonal molecular methods (FISH + RT-PCR) across multiple anatomic sites in a systematic cohort; replicated extensively in subsequent independent studies\",\n      \"pmids\": [\"21584898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The TAZ-CAMTA1 (TC) fusion protein localizes constitutively to the nucleus (escaping the cytoplasmic retention and degradation normally imposed by LATS1/2 phosphorylation of TAZ), activates a TAZ-like transcriptional program, confers resistance to anoikis, and causes oncogenic transformation of cells. The oncogenic activity depends on nuclear localization driven by loss of the LATS-regulated phosphodegron in the TAZ moiety.\",\n      \"method\": \"Expression of fusion construct in cell lines, anoikis resistance assay, transcriptional reporter assays, subcellular fractionation/localization\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays in a single focused mechanistic study, replicated in concept by subsequent independent mouse model and cell-line studies\",\n      \"pmids\": [\"25961935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TAZ-CAMTA1 and YAP-TFE3 fusion oncoproteins both interact with YEATS2 and ZZZ3, components of the ATAC histone acetyltransferase complex, as identified by a proteomic/genetic screen. The fusions drive a unique transcriptome by simultaneously hyperactivating a TEAD-based transcriptional program and modulating chromatin via the ATAC complex.\",\n      \"method\": \"Proteomic/genetic screen (Co-IP/MS), integrative next-generation sequencing (ChIP-seq, RNA-seq) in human and murine cell lines\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP/MS identification of ATAC complex interaction validated by multiple orthogonal genomic and functional methods in two independent cell systems\",\n      \"pmids\": [\"33913810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Conditional knock-in of Wwtr1-Camta1 to the endogenous Wwtr1 locus in mice is sufficient to drive EHE tumor formation exclusively in endothelial cells, demonstrating that TAZ-CAMTA1 is the key oncogenic driver. Expression in endothelial cells recapitulates the human disease histologically, immunohistochemically, and genetically.\",\n      \"method\": \"Conditional knock-in mouse model (Cre-activated Wwtr1-Camta1 allele targeted to Wwtr1 locus), histological and molecular characterization\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic sufficiency demonstrated using endogenous-locus conditional knock-in model with comprehensive characterization; independently confirmed in a parallel mouse model study (PMID 33766984)\",\n      \"pmids\": [\"33766982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TAZ-CAMTA1 expression in endothelial cells initiates an angiogenic and regenerative-like transcriptional program. Disruption of the TAZ-CAMTA1–TEAD interaction (by dominant-negative TEAD expression in vivo) inhibits TAZ-CAMTA1-mediated vascular tumor formation, establishing TEAD as a required transcriptional effector of the fusion oncoprotein.\",\n      \"method\": \"Endothelial-specific transgenic mouse model, dominant-negative TEAD in vivo rescue experiment, transcriptome profiling\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via dominant-negative TEAD in vivo establishes pathway dependence; complemented by full transcriptome analysis and independent mouse model replication\",\n      \"pmids\": [\"33766984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CTGF is a tumorigenic transcriptional target of the TAZ-CAMTA1 fusion. CTGF binds integrin αIIbβ3 to sustain anchorage-independent proliferation of TC-transformed cells, and acts upstream of Ras-MAPK signaling. Pharmacologic MAPK inhibition (trametinib) or CTGF knockdown abrogates TC-driven growth in vitro and in xenograft models.\",\n      \"method\": \"NIH3T3 cell transformation model, soft-agar/suspension growth assays, CTGF knockdown, xenograft model, pharmacologic MAPK inhibition (trametinib, PD0325901)\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetic knockdown, pharmacologic inhibition, in vitro and in vivo validation) in a single focused mechanistic study\",\n      \"pmids\": [\"35443056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Upon TAZ-CAMTA1 expression in primary endothelial cells, cells rapidly enter a hypertranscription state, triggering DNA damage, S-phase arrest, and impaired homologous recombination (reduced BRCA1 and RAD51 foci), leading to senescence. Loss of CDKN2A bypasses this senescence to allow uncontrolled growth, providing a mechanistic basis for CDKN2A as the most common secondary mutation in EHE.\",\n      \"method\": \"Doxycycline-inducible TAZ-CAMTA1 in primary endothelial cells, DNA damage foci (γH2AX, BRCA1, RAD51) immunofluorescence, cell cycle analysis, senescence assays, Cdkn2a knockout mouse model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal cellular and genetic methods (inducible expression, DNA damage markers, cell cycle analysis, in vivo Cdkn2a KO) establish the mechanistic sequence\",\n      \"pmids\": [\"37980390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of CDKN2A in the context of the TAZ-CAMTA1 (TC) fusion in endothelial cells produces more aggressive EHE with earlier morbidity/mortality and enhanced tumor cell proliferation in a conditional mouse model, establishing CDKN2A loss as a cooperating oncogenic event with TC. EHE cell lines derived from these tumors are addicted to the TC oncoprotein.\",\n      \"method\": \"Conditional mouse model (TC allele + Cdkn2a knockout + endothelial Cre), single-cell RNA-seq, ex vivo cell line derivation and xenograft\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis with conditional double-mutant mouse, confirmed by cell line characterization and xenograft\",\n      \"pmids\": [\"36598859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CAMTA1 functions as a tumor suppressor in neuroblastoma: ectopic CAMTA1 expression slowed cell proliferation (increased G1/G0), inhibited anchorage-independent colony formation, suppressed xenograft growth, and induced neurite-like processes and neuronal differentiation markers. Transcriptome analysis identified 683 CAMTA1-regulated genes enriched for neuronal function and differentiation. Retinoic acid and other differentiation stimuli upregulated CAMTA1 expression.\",\n      \"method\": \"Inducible ectopic CAMTA1 expression in neuroblastoma cell lines, cell cycle analysis, soft-agar colony assay, xenograft model, transcriptome analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays (in vitro proliferation, colony formation, in vivo xenograft) plus transcriptome profiling in a single focused study\",\n      \"pmids\": [\"21385898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CAMTA1 is a direct target of miR-9/9* and miR-17 in glioblastoma stem cells. CAMTA1 induces expression of the anti-proliferative cardiac hormone NPPA, reduces neurosphere formation, and suppresses tumor growth in nude mice, supporting a tumor suppressor function. miR-9/9* inhibition reduced neurosphere formation and stimulated differentiation.\",\n      \"method\": \"miRNA target validation (miR-9/9*, miR-17 → CAMTA1), CAMTA1 overexpression in glioblastoma stem cells, neurosphere formation assay, nude mouse tumor growth assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct miRNA targeting established with functional rescue in vitro and in vivo, multiple orthogonal approaches in single focused study\",\n      \"pmids\": [\"21857646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Global or nervous-system-specific deletion of CAMTA1 in mice causes severe ataxia with Purkinje cell degeneration and cerebellar atrophy. Gene-expression analysis identified a large set of neuronal genes dysregulated in CAMTA1-mutant brains, and a consensus CAMTA-binding DNA sequence was determined and associated with many of these genes, establishing CAMTA1 as a direct transcriptional regulator required for Purkinje cell function and survival.\",\n      \"method\": \"Conditional knockout mouse (global and nervous-system-specific), gene-expression analysis, consensus DNA binding motif determination\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function mouse genetics with defined cellular phenotype plus transcriptome and DNA-binding motif analysis; replicated by clinical genetics literature\",\n      \"pmids\": [\"25049392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Acute hippocampal knockdown of CAMTA1 (but not CAMTA2) in adult mice impairs contextual fear conditioning and object-place recognition (long-term memory), without affecting short-term memory or neuronal morphology. Gene expression profiling revealed CAMTA1-dependent regulation of genes related to synaptic transmission and neuronal excitability, and patch-clamp recordings confirmed CAMTA1-dependent electrophysiological changes.\",\n      \"method\": \"shRNA knockdown in adult mouse hippocampus, behavioral memory tests (fear conditioning, object-place recognition), transcriptome profiling, patch-clamp electrophysiology\",\n      \"journal\": \"Learning & memory (Cold Spring Harbor, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function with isoform specificity (CAMTA1 vs CAMTA2), defined behavioral phenotype, complemented by transcriptome and electrophysiology\",\n      \"pmids\": [\"27194798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CAMTA1 knockdown in pancreatic beta cells (INS-1 832/13 and Wistar rat islets) reduced miR-212/miR-132 promoter activity and expression, decreased insulin secretion and voltage-dependent Ca2+ currents, and altered insulin content. CAMTA1 protein physically interacts with the homeodomain transcription factor Nkx2-2. These results place CAMTA1 as a regulator of the miR-212/miR-132 cluster and of multiple steps in beta-cell insulin secretion.\",\n      \"method\": \"Camta1 siRNA knockdown in INS-1 cells and rat islets, miR-212/miR-132 promoter-reporter assay, insulin secretion/content assays, patch-clamp (Ca2+ currents), Co-IP (CAMTA1–Nkx2-2 interaction)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for protein interaction plus multiple functional readouts (promoter activity, secretion, electrophysiology) in a single lab; no independent replication\",\n      \"pmids\": [\"27402838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Ca2+-dependent upregulation of CAMTA1 in mesenchymal stem cells co-cultured with cardiomyocytes precedes activation of a myocardial gene program. CAMTA1 loss-of-function minimized cardiac gene program activation in stem cells, establishing CAMTA1 as an early Ca2+-dependent intermediate required for cardiomyocyte-lineage commitment.\",\n      \"method\": \"Co-culture of mesenchymal stem cells with neonatal cardiomyocytes, Ca2+ imaging, CAMTA1 loss-of-function (knockdown), cardiac gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined phenotypic readout (cardiac gene program activation), Ca2+ imaging mechanistic link; single lab, limited orthogonal validation\",\n      \"pmids\": [\"22715383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CAMTA1 overexpression in glioma cells inhibited cell growth, migration, invasion, and cell cycle progression, and enhanced temozolomide-induced apoptosis. Overexpression decreased ITGA5, ITGB1, p-AKT, p-FAK, and Myc protein levels, placing CAMTA1 as a suppressor upstream of integrin/AKT/FAK/Myc signaling in glioma.\",\n      \"method\": \"CAMTA1 overexpression in glioma cell lines, cell viability/migration/invasion assays, flow cytometry cell cycle/apoptosis analysis, Western blot for signaling proteins, xenograft model\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple in vitro and in vivo functional assays with signaling protein readouts; single lab, no epistasis or rescue experiments to confirm pathway placement\",\n      \"pmids\": [\"33316386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CAMTA1 forms a multi-protein complex with PPP3CA (calcineurin A) and NFATc4. CAMTA1 and PPP3CA competitively bind to NFATc4; CAMTA1 knockdown promotes PPP3CA-mediated dephosphorylation and activation of NFATc4, leading to upregulation of NFATc4 target genes, increased proliferation/invasion, and oxaliplatin resistance in colorectal cancer cells.\",\n      \"method\": \"Co-IP (CAMTA1–PPP3CA–NFATc4 complex), CAMTA1 and PPP3CA knockdown, NFATc4 phosphorylation/expression assays, cell proliferation/invasion/apoptosis assays, xenograft model\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for complex identification, multiple functional readouts and in vivo validation; single lab, no independent replication\",\n      \"pmids\": [\"35332122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"lncCAMTA1 physically associates with the CAMTA1 promoter, induces a repressive chromatin structure, and thereby inhibits CAMTA1 transcription in hepatocellular carcinoma. CAMTA1 is required for the effects of lncCAMTA1 on HCC cell proliferation and cancer stem cell-like properties.\",\n      \"method\": \"ChIP (chromatin association of lncCAMTA1 at CAMTA1 promoter), lncCAMTA1 overexpression/knockdown, CAMTA1 rescue experiments, in vitro and in vivo functional assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP establishes promoter association; CAMTA1 rescue confirms epistatic relationship; single lab\",\n      \"pmids\": [\"27669232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CAMTA1 knockout in SH-SY5Y cells increased cyclin D1 (CCND1) expression under oxygen-glucose deprivation/reoxygenation (OGD/R) conditions, and RNA-seq revealed pathways involved in cellular proliferation and cell cycle enriched in CAMTA1 KO cells, establishing CAMTA1 as a regulator of cyclin D1 and cell-cycle progression in the context of ischemia-reperfusion injury.\",\n      \"method\": \"CAMTA1 CRISPR knockout in SH-SY5Y cells, RNA-seq, CCND1 protein/mRNA quantification under OGD/R model, methylation analysis (850K BeadChip)\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean CRISPR KO with transcriptome readout and CCND1 protein validation under a defined stress model; single lab, no rescue\",\n      \"pmids\": [\"36159397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Bioinformatic characterization of the CAMTA1 protein domain structure identified: a CG-1 domain, TIG domain, ankyrin repeats, and IQ motifs (calmodulin-binding), defining CAMTA1 as a member of the calmodulin-binding transcription activator (CAMTA) family. KIAA0833 was identified as the representative human CAMTA1 cDNA. Mouse Camta1 was determined to share 94.1% amino acid identity with human CAMTA1.\",\n      \"method\": \"Bioinformatics/in silico domain analysis, cDNA sequence assembly\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational prediction only; no experimental functional validation of domain activities in this paper\",\n      \"pmids\": [\"12964007\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CAMTA1 is a calmodulin-binding transcription activator (containing CG-1, TIG, ankyrin repeat, and IQ domains) that functions as a calcium-sensitive transcriptional regulator required for Purkinje cell survival and long-term memory formation in the nervous system; in cancer, a recurrent t(1;3) translocation fuses WWTR1 (TAZ) to CAMTA1, producing a constitutively nuclear TAZ-CAMTA1 oncoprotein that hyperactivates TEAD-dependent transcription, recruits the ATAC histone acetyltransferase complex, drives CTGF/Ras-MAPK signaling, induces hypertranscription and genomic instability, and is sufficient to initiate epithelioid hemangioendothelioma in endothelial cells, with CDKN2A loss cooperating to bypass fusion-induced senescence and accelerate tumor progression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CAMTA1 is a calcium-responsive transcriptional regulator with dual roles as a developmental/neuronal transcription factor and, when disrupted by chromosomal rearrangement, as the substrate for a potent oncogenic fusion [#10, #0]. In the nervous system, loss of CAMTA1 in mice causes Purkinje cell degeneration, cerebellar atrophy, and dysregulation of large neuronal gene sets, and a consensus CAMTA-binding DNA motif links it directly to these targets, establishing CAMTA1 as a transcriptional regulator required for Purkinje cell survival [#10]; acute hippocampal knockdown selectively impairs long-term memory and alters genes controlling synaptic transmission and neuronal excitability [#11]. Across multiple tumor contexts CAMTA1 acts as a tumor suppressor: it slows proliferation, drives neuronal/neurosphere differentiation, and suppresses xenograft growth in neuroblastoma and glioblastoma stem cells [#8, #9]. Its activity intersects calcium signaling through participation in a complex with the calcineurin subunit PPP3CA and NFATc4, where CAMTA1 competes with PPP3CA for NFATc4 binding to restrain NFAT activation [#15]. The recurrent t(1;3) translocation fuses WWTR1 (TAZ) to CAMTA1, generating a fusion oncoprotein that escapes LATS1/2-imposed cytoplasmic retention and is constitutively nuclear, activating a TAZ-like, TEAD-dependent transcriptional program and transforming cells [#1, #4]; this fusion is sufficient to initiate epithelioid hemangioendothelioma specifically in endothelial cells in vivo [#3]. Mechanistically the fusion recruits the ATAC histone acetyltransferase complex via YEATS2 and ZZZ3 to remodel chromatin alongside TEAD activation [#2], induces the tumorigenic target CTGF, which signals through integrin \\u03b1IIb\\u03b23 and upstream of Ras-MAPK [#5], and drives a hypertranscription state producing DNA damage and senescence that CDKN2A loss bypasses to accelerate tumorigenesis [#6, #7]. CAMTA1 domain architecture (CG-1, TIG, ankyrin repeats, calmodulin-binding IQ motifs) defines it as a calmodulin-binding transcription activator family member [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Before functional studies, the question was what kind of protein CAMTA1 is; domain analysis defined it as a calmodulin-binding transcription activator, framing a calcium-sensitive transcription factor.\",\n      \"evidence\": \"in silico domain analysis and cDNA assembly identifying CG-1, TIG, ankyrin, and IQ domains\",\n      \"pmids\": [\"12964007\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Computational prediction only; no experimental validation of domain activities\", \"Calmodulin binding to IQ motifs not functionally tested\", \"No demonstration of transcriptional activity\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"It was unknown whether CAMTA1 has a physiological growth-control role; ectopic expression showed it suppresses proliferation and drives neuronal differentiation, establishing a tumor-suppressor function.\",\n      \"evidence\": \"inducible CAMTA1 expression in neuroblastoma cells with cell cycle, soft-agar, xenograft, and transcriptome readouts; miRNA targeting and NPPA induction in glioblastoma stem cells\",\n      \"pmids\": [\"21385898\", \"21857646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets driving the phenotype not fully defined\", \"Calcium-dependence of this activity not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The molecular lesion behind epithelioid hemangioendothelioma was unknown; identification of the recurrent t(1;3) WWTR1-CAMTA1 fusion established a tumor-specific molecular abnormality.\",\n      \"evidence\": \"FISH positional cloning and RT-PCR across multiple anatomic sites in an EHE cohort\",\n      \"pmids\": [\"21584898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether the fusion is causal or how it transforms cells\", \"Functional contribution of the CAMTA1 moiety unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The in vivo role of CAMTA1 in the nervous system was unclear; conditional knockout revealed it is required for Purkinje cell survival and directly regulates neuronal genes via a defined DNA motif.\",\n      \"evidence\": \"global and nervous-system-specific knockout mice with gene-expression analysis and consensus binding-motif determination\",\n      \"pmids\": [\"25049392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct genomic occupancy at endogenous targets not mapped by ChIP\", \"Role of calmodulin/calcium in this regulation not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Whether the WWTR1-CAMTA1 fusion is oncogenic and by what mechanism was open; the fusion was shown to be constitutively nuclear, escaping LATS-regulated degradation, and to transform cells via a TAZ-like program.\",\n      \"evidence\": \"fusion expression in cell lines with subcellular fractionation, anoikis assays, and transcriptional reporters\",\n      \"pmids\": [\"25961935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Required transcriptional cofactors not yet identified\", \"In vivo sufficiency not demonstrated in this study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"It was unknown whether the fusion alone causes EHE and which effectors it requires; endogenous-locus knock-in showed endothelial-specific tumor formation, and dominant-negative TEAD established TEAD as a required effector, while proteomics identified ATAC complex recruitment.\",\n      \"evidence\": \"conditional knock-in and endothelial transgenic mouse models with dominant-negative TEAD rescue; Co-IP/MS and ChIP-seq/RNA-seq identifying YEATS2/ZZZ3 (ATAC complex)\",\n      \"pmids\": [\"33766982\", \"33766984\", \"33913810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the fusion recruits ATAC not structurally defined\", \"Cell-of-origin specificity for endothelium not fully explained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The downstream effectors linking fusion-driven transcription to tumor growth were unclear; CTGF was identified as a tumorigenic target acting via integrin \\u03b1IIb\\u03b23 and upstream of Ras-MAPK, defining a druggable axis.\",\n      \"evidence\": \"NIH3T3 transformation, CTGF knockdown, xenografts, and pharmacologic MAPK inhibition (trametinib)\",\n      \"pmids\": [\"35443056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding of fusion to the CTGF promoter not shown\", \"Relevance of integrin \\u03b1IIb\\u03b23 in patient tumors not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Why CDKN2A loss is the most common secondary mutation in EHE was unknown; the fusion was shown to induce hypertranscription, DNA damage, impaired homologous recombination, and senescence, which CDKN2A loss bypasses to accelerate tumorigenesis.\",\n      \"evidence\": \"inducible fusion in primary endothelial cells with DNA-damage foci, cell-cycle and senescence assays; conditional fusion + Cdkn2a knockout mouse and scRNA-seq\",\n      \"pmids\": [\"37980390\", \"36598859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of the hypertranscription-induced DNA damage not mechanistically resolved\", \"Other cooperating events beyond CDKN2A not surveyed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Whether wild-type CAMTA1 intersects calcium signaling at the protein level was unaddressed; it was shown to form a complex with calcineurin (PPP3CA) and NFATc4, competing with PPP3CA to restrain NFAT activation.\",\n      \"evidence\": \"Co-IP of the CAMTA1-PPP3CA-NFATc4 complex with knockdown, NFATc4 phosphorylation assays, and xenografts in colorectal cancer cells\",\n      \"pmids\": [\"35332122\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP-based complex without reciprocal/structural validation\", \"Not independently replicated\", \"Relationship to CAMTA1 transcriptional activity unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CAMTA1's calmodulin-binding/calcium-sensing architecture mechanistically couples to its transcriptional output, and whether the wild-type protein's tumor-suppressor and the fusion's oncogenic programs share regulatory logic, remains unresolved.\",\n      \"evidence\": \"no single study in the corpus directly tests calcium/calmodulin control of CAMTA1 transcriptional activity\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Calcium/calmodulin dependence of CAMTA1 transcription not experimentally demonstrated\", \"Genome-wide direct targets of wild-type CAMTA1 not mapped\", \"Structural basis of the fusion-ATAC-TEAD assembly unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10, 8, 4]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10, 8, 4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"complexes\": [\"ATAC histone acetyltransferase complex\", \"CAMTA1-PPP3CA-NFATc4 complex\"],\n    \"partners\": [\"WWTR1\", \"TEAD\", \"YEATS2\", \"ZZZ3\", \"PPP3CA\", \"NFATc4\", \"Nkx2-2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}