{"gene":"ART1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1998,"finding":"Mouse Art1 encodes a GPI-anchored ecto-enzyme with arginine-specific mono-ADP-ribosyltransferase activity, predominantly expressed in cardiac and skeletal muscle; recombinant Art1-Fc fusion protein exhibits arginine-specific ADP-ribosyltransferase activity in vitro.","method":"Molecular cloning, Northern blot, recombinant protein expression, enzymatic assay","journal":"The Biochemical Journal","confidence":"High","confidence_rationale":"Tier 1 — recombinant protein reconstitution with enzymatic assay, replicated structural prediction","pmids":["9841866"],"is_preprint":false},{"year":2008,"finding":"ART1 expression in skeletal muscle myotubes is transcriptionally activated by cooperative binding of myogenin to an E-box and MEF-2 to an A/T-rich element in the proximal promoter, identified by gel mobility shift assay and mutagenesis.","method":"Promoter deletion analysis, gel mobility shift assay (EMSA), site-directed mutagenesis, reporter assay","journal":"BMC Molecular Biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (EMSA, mutagenesis, reporter gene) in single study","pmids":["18939989"],"is_preprint":false},{"year":2008,"finding":"ART1 ADP-ribosylates α7-integrin, and this post-translational modification increases laminin-binding affinity of the α7β1-integrin complex.","method":"Biochemical ADP-ribosylation assay, laminin binding assay","journal":"BMC Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical evidence but single study","pmids":["18939989"],"is_preprint":false},{"year":2014,"finding":"Human ARTC1 localizes to the endoplasmic reticulum (not as a GPI-anchored ecto-enzyme) and ADP-ribosylates the ER luminal chaperone GRP78/BiP; ARTC1 is activated during ER stress response, resulting in acute ADP-ribosylation of GRP78/BiP paralleling translational inhibition.","method":"Subcellular fractionation, immunofluorescence co-localization, macro domain pull-down for ADP-ribosylated proteins, ER stress induction","journal":"Cellular and Molecular Life Sciences","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization, pull-down, functional ER stress assay) in single study","pmids":["25292337"],"is_preprint":false},{"year":2018,"finding":"ARTC1 catalyzes arginine-specific ADP-ribosylation of hundreds of cell-surface and extracellular proteins in skeletal muscle and heart; hemopexin (HPX) was validated as an ARTC1 target, with modifications absent in ARTC1-deficient mouse tissues.","method":"Mass spectrometry-based ADP-ribosylome profiling, ARTC1-KO mouse comparison, validation of individual targets","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1-2 — proteome-wide MS with genetic KO control and individual target validation","pmids":["30110646"],"is_preprint":false},{"year":2024,"finding":"Human ARTC1 ADP-ribosylates VAPB at Arg50; hARTC3 interacts with hARTC1 and stabilizes it to promote its enzymatic activity; ARTC1-mediated VAPB ADP-ribosylation is required for intracellular calcium homeostasis.","method":"Co-immunoprecipitation, site-directed mutagenesis (Arg50 identification), ARTC1 knockdown with calcium imaging","journal":"Journal of Molecular Cell Biology","confidence":"High","confidence_rationale":"Tier 1-2 — site identification by mutagenesis, binding partner by Co-IP, functional readout by calcium measurement","pmids":["37381178"],"is_preprint":false},{"year":2022,"finding":"Tumor-expressed ART1 mediates ADP-ribosylation of P2X7R on CD8+ T cells, activating NAD-induced cell death (NICD) and reducing CD8+ T cell infiltration; genetic and antibody-mediated ART1 inhibition slowed tumor growth in a CD8 T cell-dependent manner in murine NSCLC and melanoma models.","method":"In vitro ADP-ribosylation assay, ART1 genetic KO mouse models, antibody blockade, tumor growth assays, flow cytometry","journal":"Science Translational Medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus antibody blockade with defined cellular phenotype, multiple models","pmids":["35294260"],"is_preprint":false},{"year":2013,"finding":"ART1 silencing in CT26 colon carcinoma cells enhances cisplatin-induced apoptosis via reduced phospho-Akt (Thr308) and reduced NF-κB p65 nuclear translocation, with decreased Bcl-2/Bcl-xL and increased Bax expression.","method":"lentiviral shRNA knockdown, Western blot, flow cytometry, CCK8 assay","journal":"Cellular Physiology and Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — loss-of-function with defined pathway readout, single lab","pmids":["24335275"],"is_preprint":false},{"year":2015,"finding":"ART1 silencing or overexpression in CT26 cells modulates Akt and Erk signaling and downstream expression of βIII-tubulin (Tubb3), linking ART1 to apoptosis regulation in colon carcinoma allograft models.","method":"lentiviral shRNA/cDNA overexpression, Western blot, pathway inhibitor experiments, in vivo allograft","journal":"Tumour Biology","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, pharmacological inhibitors used for pathway placement","pmids":["26373733"],"is_preprint":false},{"year":2015,"finding":"ART1 overexpression promotes starvation-induced autophagy in CT26 colon carcinoma cells via a pathway involving Rac1, NF-κB, PARP-1, LKB1, and p-AMPK, and ART1 interacts with integrin α7 as shown by co-immunoprecipitation.","method":"Lentiviral overexpression/knockdown, co-immunoprecipitation, Western blot, electron microscopy, pathway inhibitors","journal":"American Journal of Cancer Research","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus pathway inhibitor data, single lab","pmids":["25973293"],"is_preprint":false},{"year":2024,"finding":"ART1 knockdown reduces gp130 (IL-6 receptor co-receptor) protein levels and decreases IL-6-induced STAT3 phosphorylation, c-Myc, cyclin D1, and Bcl-xL in colorectal cancer cells; ART1 and gp130 co-localize in CRC cells.","method":"lentiviral shRNA, co-localization by immunofluorescence, Western blot, in vivo xenograft","journal":"BMC Cancer","confidence":"Medium","confidence_rationale":"Tier 3 — co-localization and loss-of-function with pathway readout, single lab","pmids":["38504172"],"is_preprint":false},{"year":2005,"finding":"ARTC1 mutations in 164mel melanoma cells produce a novel peptide ligand recognized by tumor-specific CD4+ regulatory T cells, which suppress melanoma-reactive T cell proliferation and IL-2 secretion; presentation requires intact tumor cells rather than tumor lysates.","method":"T cell clone functional assays (proliferation, IL-2 secretion), antigen identification by expression cloning, peptide presentation assays","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — functional T cell assays with defined antigen, single lab","pmids":["15728473"],"is_preprint":false},{"year":2023,"finding":"Artc1-KO mice show decreased spontaneous tumorigenesis and increased multi-organ inflammation with TNF-α upregulation; in xenograft models, ARTC1 deficiency reduced tumorigenicity with CD8+ T cell and macrophage tumor infiltration and necroptosis; Artc1-KO male hearts showed reduced myocardial contractility and increased susceptibility to ischemia-reperfusion injury with elevated RIP3 levels, indicating ARTC1 suppresses necroptosis.","method":"Artc1-KO mice (genetic loss-of-function), xenograft tumor models, echocardiography/MRI, immunohistochemistry, Western blot","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with multiple phenotypic readouts, preprint not yet peer-reviewed","pmids":["36945646"],"is_preprint":true},{"year":2017,"finding":"ART1 knockdown in CT26 cells inhibits spleen transplant tumor growth and liver metastasis in vivo, accompanied by altered expression of FAK, RhoA, c-myc, c-fos, and COX-2, placing ART1 upstream of the RhoA signaling axis in colon carcinoma invasion.","method":"Lentiviral shRNA/overexpression, in vivo spleen transplant model, Western blot","journal":"Molecular Medicine Reports","confidence":"Medium","confidence_rationale":"Tier 3 — in vivo model with pathway marker readout, single lab","pmids":["28138708"],"is_preprint":false}],"current_model":"ARTC1/ART1 is a GPI-anchored (or ER-localized) arginine-specific mono-ADP-ribosyltransferase that uses NAD+ as substrate to transfer ADP-ribose onto arginine residues of extracellular/cell-surface targets (including α7-integrin, GRP78/BiP, VAPB, hemopexin, and P2X7R on T cells), thereby modulating integrin-laminin adhesion, ER stress responses, calcium homeostasis, and immune cell viability; its expression in muscle is driven cooperatively by myogenin/E-box and MEF-2/A-T-rich element interactions, and tumor cell-expressed ARTC1 promotes immune evasion by inducing NAD-dependent death of P2X7R+ CD8+ T cells."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing that Art1 encodes a functional arginine-specific mono-ADP-ribosyltransferase resolved the molecular identity and enzymatic specificity of the gene product, placing it in the ecto-enzyme family with predominant cardiac and skeletal muscle expression.","evidence":"Molecular cloning, recombinant Art1-Fc fusion protein with in vitro enzymatic assay, Northern blot in mouse tissues","pmids":["9841866"],"confidence":"High","gaps":["Endogenous substrates in muscle not identified","Human ortholog localization not determined","Catalytic mechanism and NAD+ binding site not structurally resolved"]},{"year":2005,"claim":"Identification of mutant ARTC1 peptides as antigens recognized by CD4+ regulatory T cells in melanoma linked ART1 to tumor immunology for the first time, raising the question of whether ART1 enzymatic activity contributes to immune modulation.","evidence":"Expression cloning and functional T cell assays with 164mel melanoma-derived T cell clones","pmids":["15728473"],"confidence":"Medium","gaps":["Whether wild-type ARTC1 enzymatic activity (not just mutant peptide) modulates anti-tumor immunity was not tested","Generalizability beyond a single melanoma line unknown"]},{"year":2008,"claim":"Demonstrating that myogenin/E-box and MEF-2/A-T-rich element cooperativity drives ART1 transcription in myotubes, and that ART1 ADP-ribosylates α7-integrin to enhance laminin binding, connected the enzyme's tissue-specific expression to a functional role in muscle cell-matrix adhesion.","evidence":"Promoter mutagenesis with reporter assays, EMSA, biochemical ADP-ribosylation and laminin-binding assays","pmids":["18939989"],"confidence":"High","gaps":["In vivo significance of α7-integrin ADP-ribosylation for muscle function not tested","Whether ADP-ribosylation is reversible in this context unknown"]},{"year":2013,"claim":"Loss-of-function studies in colon carcinoma cells revealed that ART1 sustains pro-survival Akt/NF-κB signaling and suppresses cisplatin-induced apoptosis, broadening ART1's role from muscle physiology to cancer cell survival.","evidence":"Lentiviral shRNA knockdown in CT26 cells with Western blot for phospho-Akt, NF-κB p65, Bcl-2 family members","pmids":["24335275"],"confidence":"Medium","gaps":["Direct ADP-ribosylation substrate linking ART1 to Akt activation not identified","Results from a single cell line and single lab","Whether this reflects enzymatic activity or scaffold function unclear"]},{"year":2014,"claim":"Showing that human ARTC1 resides in the ER lumen and ADP-ribosylates GRP78/BiP during ER stress overturned the assumption that ARTC1 acts exclusively as an ecto-enzyme and established a role in the unfolded protein response.","evidence":"Subcellular fractionation, immunofluorescence, macro-domain pull-down for ADP-ribosylated proteins, ER stress induction","pmids":["25292337"],"confidence":"High","gaps":["How ER-localized ARTC1 is activated by ER stress not mechanistically resolved","Functional consequence of GRP78 ADP-ribosylation on chaperone activity not determined","Reconciliation of GPI-anchored ecto-enzyme versus ER-resident forms across species incomplete"]},{"year":2018,"claim":"Proteome-wide ADP-ribosylome profiling in ARTC1-KO mice revealed hundreds of substrates in muscle and heart and validated hemopexin as a bona fide target, establishing ART1 as a broad-specificity extracellular/surface ADP-ribosyltransferase.","evidence":"Mass spectrometry-based profiling comparing wild-type and ARTC1-KO mouse tissues","pmids":["30110646"],"confidence":"High","gaps":["Functional consequences of ADP-ribosylation for most identified substrates unknown","Whether all identified sites are direct ARTC1 targets or include indirect effects not fully resolved"]},{"year":2022,"claim":"Demonstrating that tumor-expressed ART1 ADP-ribosylates P2X7R on CD8+ T cells to trigger NAD-induced cell death provided a direct immune-evasion mechanism and validated ART1 as a therapeutic target, with antibody blockade restoring anti-tumor immunity.","evidence":"In vitro ADP-ribosylation assay, ART1-KO mice, anti-ART1 antibody blockade in NSCLC and melanoma tumor models, flow cytometry of CD8+ T cell infiltration","pmids":["35294260"],"confidence":"High","gaps":["Whether ART1-mediated NICD operates in human tumors in situ not demonstrated","Structural basis of ART1-P2X7R interaction not resolved","Contribution of other ARTC family members to NICD not excluded"]},{"year":2024,"claim":"Identification of VAPB Arg50 as an ARTC1 substrate and ARTC3 as a stabilizing partner linked ART1 enzymatic activity to intracellular calcium homeostasis, revealing a regulatory circuit within the ARTC family.","evidence":"Co-immunoprecipitation of ARTC1-ARTC3, site-directed mutagenesis of VAPB Arg50, calcium imaging after ARTC1 knockdown","pmids":["37381178"],"confidence":"High","gaps":["Structural basis of ARTC3-ARTC1 stabilization not determined","Whether VAPB ADP-ribosylation affects ER-mitochondria contact sites not tested","Tissue contexts beyond cell lines not explored"]},{"year":null,"claim":"Key unresolved questions include the structural basis of ARTC1 catalysis and substrate selectivity, how the enzyme is partitioned between ER-luminal and GPI-anchored pools across tissues, and whether ART1-targeted therapies can be translated to human cancer immunotherapy.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of ARTC1","No systematic comparison of ER versus cell-surface pools in human tissues","Human clinical relevance of anti-ART1 immunotherapy not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2,3,4,5,6]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,6]}],"pathway":[],"complexes":[],"partners":["ARTC3","ITGA7","GRP78","VAPB","P2X7R","HPX"],"other_free_text":[]},"mechanistic_narrative":"ART1 (ARTC1) is a GPI-anchored or ER-resident arginine-specific mono-ADP-ribosyltransferase that uses NAD+ as a co-substrate to transfer ADP-ribose onto arginine residues of cell-surface, extracellular, and ER-luminal target proteins, thereby regulating integrin-mediated adhesion, ER stress responses, calcium homeostasis, and immune cell viability. ART1 modifies α7-integrin to enhance laminin binding, ADP-ribosylates the ER chaperone GRP78/BiP during the unfolded protein response, and modifies VAPB at Arg50 to maintain intracellular calcium homeostasis, with its enzymatic activity stabilized by interaction with ARTC3 [PMID:18939989, PMID:25292337, PMID:37381178]. Proteome-wide profiling in ARTC1-knockout mice identified hundreds of ADP-ribosylated substrates in skeletal muscle and heart, including hemopexin [PMID:30110646]. Tumor-expressed ART1 ADP-ribosylates P2X7R on CD8+ T cells, triggering NAD-induced cell death and enabling immune evasion, and genetic or antibody-mediated ART1 blockade restores anti-tumor immunity in murine cancer models [PMID:35294260]."},"prefetch_data":{"uniprot":{"accession":"P52961","full_name":"GPI-linked NAD(P)(+)--arginine ADP-ribosyltransferase 1","aliases":["ADP-ribosyltransferase C2 and C3 toxin-like 1","ARTC1","Mono(ADP-ribosyl)transferase 1"],"length_aa":327,"mass_kda":36.3,"function":"Has ADP-ribosyltransferase activity toward GLP1R","subcellular_location":"Sarcoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/P52961/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ART1","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ART1","total_profiled":1310},"omim":[{"mim_id":"610624","title":"ADP-RIBOSYLSERINE HYDROLASE; ADPRS","url":"https://www.omim.org/entry/610624"},{"mim_id":"610620","title":"ADP-RIBOSYLHYDROLASE-LIKE 1; ADPRHL1","url":"https://www.omim.org/entry/610620"},{"mim_id":"603853","title":"TETRASPANIN 32; TSPAN32","url":"https://www.omim.org/entry/603853"},{"mim_id":"603086","title":"ADP-RIBOSYLTRANSFERASE 3; ART3","url":"https://www.omim.org/entry/603086"},{"mim_id":"601625","title":"ADP-RIBOSYLTRANSFERASE 1; ART1","url":"https://www.omim.org/entry/601625"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"skeletal muscle","ntpm":44.4},{"tissue":"tongue","ntpm":34.3}],"url":"https://www.proteinatlas.org/search/ART1"},"hgnc":{"alias_symbol":["ART2","CD296","ARTC1"],"prev_symbol":[]},"alphafold":{"accession":"P52961","domains":[{"cath_id":"3.90.176.10","chopping":"36-100_107-287","consensus_level":"medium","plddt":94.2913,"start":36,"end":287}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P52961","model_url":"https://alphafold.ebi.ac.uk/files/AF-P52961-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P52961-F1-predicted_aligned_error_v6.png","plddt_mean":84.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ART1","jax_strain_url":"https://www.jax.org/strain/search?query=ART1"},"sequence":{"accession":"P52961","fasta_url":"https://rest.uniprot.org/uniprotkb/P52961.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P52961/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P52961"}},"corpus_meta":[{"pmid":"23453459","id":"PMC_23453459","title":"Effects 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colon carcinoma CT26 cells in vivo.","date":"2017","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/28138708","citation_count":15,"is_preprint":false},{"pmid":"31658248","id":"PMC_31658248","title":"Yeast α-arrestin Art2 is the key regulator of ubiquitylation-dependent endocytosis of plasma membrane vitamin B1 transporters.","date":"2019","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/31658248","citation_count":15,"is_preprint":false},{"pmid":"26307000","id":"PMC_26307000","title":"Evaluation of the expression and function of the P2X7 receptor and ART1 in human regulatory T-cell subsets.","date":"2015","source":"Immunobiology","url":"https://pubmed.ncbi.nlm.nih.gov/26307000","citation_count":15,"is_preprint":false},{"pmid":"11396961","id":"PMC_11396961","title":"A hematopoietic-specific transmembrane protein, Art-1, is possibly regulated by AML1.","date":"2001","source":"Biochemical and biophysical research 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Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/12077446","citation_count":8,"is_preprint":false},{"pmid":"11683379","id":"PMC_11683379","title":"Levels of Art2+ cells but not soluble Art2 protein correlate with expression of autoimmune diabetes in the BB rat.","date":"2001","source":"Autoimmunity","url":"https://pubmed.ncbi.nlm.nih.gov/11683379","citation_count":8,"is_preprint":false},{"pmid":"38069359","id":"PMC_38069359","title":"Overexpression of an ART1-Interacting Gene OsNAC016 Improves Al Tolerance in Rice.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38069359","citation_count":7,"is_preprint":false},{"pmid":"30403748","id":"PMC_30403748","title":"Investigation of Ldb19/Art1 localization and function at the late Golgi.","date":"2018","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/30403748","citation_count":7,"is_preprint":false},{"pmid":"18838822","id":"PMC_18838822","title":"Articulospora sp. produces Art1, an inhibitor of bacterial histidine kinase.","date":"2008","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18838822","citation_count":7,"is_preprint":false},{"pmid":"11508269","id":"PMC_11508269","title":"Changing patterns of cell surface mono (ADP-ribosyl) transferase antigen ART2.2 on resting versus cytopathically-activated T cells in NOD/Lt mice.","date":"2001","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/11508269","citation_count":6,"is_preprint":false},{"pmid":"38504172","id":"PMC_38504172","title":"ART1 knockdown decreases the IL-6-induced proliferation of colorectal cancer cells.","date":"2024","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/38504172","citation_count":6,"is_preprint":false},{"pmid":"38911388","id":"PMC_38911388","title":"Pan-Cancer Analysis of ART1 and its Potential Value in Gastric Cancer.","date":"2024","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/38911388","citation_count":5,"is_preprint":false},{"pmid":"37337792","id":"PMC_37337792","title":"Art2 mediates selective endocytosis of methionine transporters during adaptation to sphingolipid depletion.","date":"2023","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/37337792","citation_count":5,"is_preprint":false},{"pmid":"21641039","id":"PMC_21641039","title":"Transgenic overexpression of toxin-related ecto-ADP-ribosyltransferase ART2.2 sensitizes T cells but not B cells to NAD-induced cell death.","date":"2011","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21641039","citation_count":4,"is_preprint":false},{"pmid":"37381178","id":"PMC_37381178","title":"ARTC1-mediated VAPB ADP-ribosylation regulates calcium homeostasis.","date":"2024","source":"Journal of molecular cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/37381178","citation_count":3,"is_preprint":false},{"pmid":"26314564","id":"PMC_26314564","title":"Evidence of a role for S. cerevisiae α-arrestin Art1 (Ldb19) in mating projection and zygote formations.","date":"2015","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/26314564","citation_count":3,"is_preprint":false},{"pmid":"40864788","id":"PMC_40864788","title":"Computational Exploration of Bacterial Compounds Targeting Arginine-Specific Mono-Adp-Ribosyl-Transferase 1 (Art1): A Pathway to Novel Therapeutic Anticancer Strategies.","date":"2025","source":"Current issues in molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/40864788","citation_count":3,"is_preprint":false},{"pmid":"11292261","id":"PMC_11292261","title":"Fetal thymi from diabetes-prone but not diabetes-resistant BB/Wor rats fail to generate mature ART2+ T-cells in organ culture.","date":"2001","source":"Cellular and molecular biology (Noisy-le-Grand, France)","url":"https://pubmed.ncbi.nlm.nih.gov/11292261","citation_count":2,"is_preprint":false},{"pmid":"40653961","id":"PMC_40653961","title":"Comparative Transcriptome Reveals ART1-Dependent Regulatory Pathways for Fe Toxicity Response in Rice Roots.","date":"2025","source":"Physiologia plantarum","url":"https://pubmed.ncbi.nlm.nih.gov/40653961","citation_count":1,"is_preprint":false},{"pmid":"36945646","id":"PMC_36945646","title":"Mono-ADP-ribosyltransferase 1 ( Artc1 )-deficiency decreases tumorigenesis, increases inflammation, decreases cardiac contractility, and reduces survival.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/36945646","citation_count":0,"is_preprint":false},{"pmid":"41361964","id":"PMC_41361964","title":"Role of Art1 in Sperm Damage Induced by Type 2 Diabetes Mellitus.","date":"2025","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/41361964","citation_count":0,"is_preprint":false},{"pmid":"16195877","id":"PMC_16195877","title":"Characterization of multiple alleles of the T-cell differentiation marker ART2 (RT6) in inbred and wild rats.","date":"2005","source":"Immunogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/16195877","citation_count":0,"is_preprint":false},{"pmid":"16453289","id":"PMC_16453289","title":"Substrate specificity of soluble and membrane-associated ADP-ribosyltransferase ART2.1.","date":"2006","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16453289","citation_count":0,"is_preprint":false},{"pmid":"41346334","id":"PMC_41346334","title":"Effect of ART1 on the efficacy of oxaliplatin in colorectal cancer under high-cholesterol conditions.","date":"2025","source":"Histology and histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/41346334","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":31061,"output_tokens":3102,"usd":0.069857},"stage2":{"model":"claude-opus-4-6","input_tokens":6509,"output_tokens":4796,"usd":0.228667},"total_usd":0.298524,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Mouse Art1 encodes a GPI-anchored ecto-enzyme with arginine-specific mono-ADP-ribosyltransferase activity, predominantly expressed in cardiac and skeletal muscle; recombinant Art1-Fc fusion protein exhibits arginine-specific ADP-ribosyltransferase activity in vitro.\",\n      \"method\": \"Molecular cloning, Northern blot, recombinant protein expression, enzymatic assay\",\n      \"journal\": \"The Biochemical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — recombinant protein reconstitution with enzymatic assay, replicated structural prediction\",\n      \"pmids\": [\"9841866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ART1 expression in skeletal muscle myotubes is transcriptionally activated by cooperative binding of myogenin to an E-box and MEF-2 to an A/T-rich element in the proximal promoter, identified by gel mobility shift assay and mutagenesis.\",\n      \"method\": \"Promoter deletion analysis, gel mobility shift assay (EMSA), site-directed mutagenesis, reporter assay\",\n      \"journal\": \"BMC Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (EMSA, mutagenesis, reporter gene) in single study\",\n      \"pmids\": [\"18939989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ART1 ADP-ribosylates α7-integrin, and this post-translational modification increases laminin-binding affinity of the α7β1-integrin complex.\",\n      \"method\": \"Biochemical ADP-ribosylation assay, laminin binding assay\",\n      \"journal\": \"BMC Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical evidence but single study\",\n      \"pmids\": [\"18939989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human ARTC1 localizes to the endoplasmic reticulum (not as a GPI-anchored ecto-enzyme) and ADP-ribosylates the ER luminal chaperone GRP78/BiP; ARTC1 is activated during ER stress response, resulting in acute ADP-ribosylation of GRP78/BiP paralleling translational inhibition.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence co-localization, macro domain pull-down for ADP-ribosylated proteins, ER stress induction\",\n      \"journal\": \"Cellular and Molecular Life Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, pull-down, functional ER stress assay) in single study\",\n      \"pmids\": [\"25292337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ARTC1 catalyzes arginine-specific ADP-ribosylation of hundreds of cell-surface and extracellular proteins in skeletal muscle and heart; hemopexin (HPX) was validated as an ARTC1 target, with modifications absent in ARTC1-deficient mouse tissues.\",\n      \"method\": \"Mass spectrometry-based ADP-ribosylome profiling, ARTC1-KO mouse comparison, validation of individual targets\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — proteome-wide MS with genetic KO control and individual target validation\",\n      \"pmids\": [\"30110646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Human ARTC1 ADP-ribosylates VAPB at Arg50; hARTC3 interacts with hARTC1 and stabilizes it to promote its enzymatic activity; ARTC1-mediated VAPB ADP-ribosylation is required for intracellular calcium homeostasis.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (Arg50 identification), ARTC1 knockdown with calcium imaging\",\n      \"journal\": \"Journal of Molecular Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — site identification by mutagenesis, binding partner by Co-IP, functional readout by calcium measurement\",\n      \"pmids\": [\"37381178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tumor-expressed ART1 mediates ADP-ribosylation of P2X7R on CD8+ T cells, activating NAD-induced cell death (NICD) and reducing CD8+ T cell infiltration; genetic and antibody-mediated ART1 inhibition slowed tumor growth in a CD8 T cell-dependent manner in murine NSCLC and melanoma models.\",\n      \"method\": \"In vitro ADP-ribosylation assay, ART1 genetic KO mouse models, antibody blockade, tumor growth assays, flow cytometry\",\n      \"journal\": \"Science Translational Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus antibody blockade with defined cellular phenotype, multiple models\",\n      \"pmids\": [\"35294260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ART1 silencing in CT26 colon carcinoma cells enhances cisplatin-induced apoptosis via reduced phospho-Akt (Thr308) and reduced NF-κB p65 nuclear translocation, with decreased Bcl-2/Bcl-xL and increased Bax expression.\",\n      \"method\": \"lentiviral shRNA knockdown, Western blot, flow cytometry, CCK8 assay\",\n      \"journal\": \"Cellular Physiology and Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — loss-of-function with defined pathway readout, single lab\",\n      \"pmids\": [\"24335275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ART1 silencing or overexpression in CT26 cells modulates Akt and Erk signaling and downstream expression of βIII-tubulin (Tubb3), linking ART1 to apoptosis regulation in colon carcinoma allograft models.\",\n      \"method\": \"lentiviral shRNA/cDNA overexpression, Western blot, pathway inhibitor experiments, in vivo allograft\",\n      \"journal\": \"Tumour Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pharmacological inhibitors used for pathway placement\",\n      \"pmids\": [\"26373733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ART1 overexpression promotes starvation-induced autophagy in CT26 colon carcinoma cells via a pathway involving Rac1, NF-κB, PARP-1, LKB1, and p-AMPK, and ART1 interacts with integrin α7 as shown by co-immunoprecipitation.\",\n      \"method\": \"Lentiviral overexpression/knockdown, co-immunoprecipitation, Western blot, electron microscopy, pathway inhibitors\",\n      \"journal\": \"American Journal of Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus pathway inhibitor data, single lab\",\n      \"pmids\": [\"25973293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ART1 knockdown reduces gp130 (IL-6 receptor co-receptor) protein levels and decreases IL-6-induced STAT3 phosphorylation, c-Myc, cyclin D1, and Bcl-xL in colorectal cancer cells; ART1 and gp130 co-localize in CRC cells.\",\n      \"method\": \"lentiviral shRNA, co-localization by immunofluorescence, Western blot, in vivo xenograft\",\n      \"journal\": \"BMC Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-localization and loss-of-function with pathway readout, single lab\",\n      \"pmids\": [\"38504172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ARTC1 mutations in 164mel melanoma cells produce a novel peptide ligand recognized by tumor-specific CD4+ regulatory T cells, which suppress melanoma-reactive T cell proliferation and IL-2 secretion; presentation requires intact tumor cells rather than tumor lysates.\",\n      \"method\": \"T cell clone functional assays (proliferation, IL-2 secretion), antigen identification by expression cloning, peptide presentation assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional T cell assays with defined antigen, single lab\",\n      \"pmids\": [\"15728473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Artc1-KO mice show decreased spontaneous tumorigenesis and increased multi-organ inflammation with TNF-α upregulation; in xenograft models, ARTC1 deficiency reduced tumorigenicity with CD8+ T cell and macrophage tumor infiltration and necroptosis; Artc1-KO male hearts showed reduced myocardial contractility and increased susceptibility to ischemia-reperfusion injury with elevated RIP3 levels, indicating ARTC1 suppresses necroptosis.\",\n      \"method\": \"Artc1-KO mice (genetic loss-of-function), xenograft tumor models, echocardiography/MRI, immunohistochemistry, Western blot\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple phenotypic readouts, preprint not yet peer-reviewed\",\n      \"pmids\": [\"36945646\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ART1 knockdown in CT26 cells inhibits spleen transplant tumor growth and liver metastasis in vivo, accompanied by altered expression of FAK, RhoA, c-myc, c-fos, and COX-2, placing ART1 upstream of the RhoA signaling axis in colon carcinoma invasion.\",\n      \"method\": \"Lentiviral shRNA/overexpression, in vivo spleen transplant model, Western blot\",\n      \"journal\": \"Molecular Medicine Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — in vivo model with pathway marker readout, single lab\",\n      \"pmids\": [\"28138708\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ARTC1/ART1 is a GPI-anchored (or ER-localized) arginine-specific mono-ADP-ribosyltransferase that uses NAD+ as substrate to transfer ADP-ribose onto arginine residues of extracellular/cell-surface targets (including α7-integrin, GRP78/BiP, VAPB, hemopexin, and P2X7R on T cells), thereby modulating integrin-laminin adhesion, ER stress responses, calcium homeostasis, and immune cell viability; its expression in muscle is driven cooperatively by myogenin/E-box and MEF-2/A-T-rich element interactions, and tumor cell-expressed ARTC1 promotes immune evasion by inducing NAD-dependent death of P2X7R+ CD8+ T cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ART1 (ARTC1) is a GPI-anchored or ER-resident arginine-specific mono-ADP-ribosyltransferase that uses NAD+ as a co-substrate to transfer ADP-ribose onto arginine residues of cell-surface, extracellular, and ER-luminal target proteins, thereby regulating integrin-mediated adhesion, ER stress responses, calcium homeostasis, and immune cell viability. ART1 modifies α7-integrin to enhance laminin binding, ADP-ribosylates the ER chaperone GRP78/BiP during the unfolded protein response, and modifies VAPB at Arg50 to maintain intracellular calcium homeostasis, with its enzymatic activity stabilized by interaction with ARTC3 [PMID:18939989, PMID:25292337, PMID:37381178]. Proteome-wide profiling in ARTC1-knockout mice identified hundreds of ADP-ribosylated substrates in skeletal muscle and heart, including hemopexin [PMID:30110646]. Tumor-expressed ART1 ADP-ribosylates P2X7R on CD8+ T cells, triggering NAD-induced cell death and enabling immune evasion, and genetic or antibody-mediated ART1 blockade restores anti-tumor immunity in murine cancer models [PMID:35294260].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that Art1 encodes a functional arginine-specific mono-ADP-ribosyltransferase resolved the molecular identity and enzymatic specificity of the gene product, placing it in the ecto-enzyme family with predominant cardiac and skeletal muscle expression.\",\n      \"evidence\": \"Molecular cloning, recombinant Art1-Fc fusion protein with in vitro enzymatic assay, Northern blot in mouse tissues\",\n      \"pmids\": [\"9841866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous substrates in muscle not identified\", \"Human ortholog localization not determined\", \"Catalytic mechanism and NAD+ binding site not structurally resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of mutant ARTC1 peptides as antigens recognized by CD4+ regulatory T cells in melanoma linked ART1 to tumor immunology for the first time, raising the question of whether ART1 enzymatic activity contributes to immune modulation.\",\n      \"evidence\": \"Expression cloning and functional T cell assays with 164mel melanoma-derived T cell clones\",\n      \"pmids\": [\"15728473\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether wild-type ARTC1 enzymatic activity (not just mutant peptide) modulates anti-tumor immunity was not tested\", \"Generalizability beyond a single melanoma line unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that myogenin/E-box and MEF-2/A-T-rich element cooperativity drives ART1 transcription in myotubes, and that ART1 ADP-ribosylates α7-integrin to enhance laminin binding, connected the enzyme's tissue-specific expression to a functional role in muscle cell-matrix adhesion.\",\n      \"evidence\": \"Promoter mutagenesis with reporter assays, EMSA, biochemical ADP-ribosylation and laminin-binding assays\",\n      \"pmids\": [\"18939989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of α7-integrin ADP-ribosylation for muscle function not tested\", \"Whether ADP-ribosylation is reversible in this context unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Loss-of-function studies in colon carcinoma cells revealed that ART1 sustains pro-survival Akt/NF-κB signaling and suppresses cisplatin-induced apoptosis, broadening ART1's role from muscle physiology to cancer cell survival.\",\n      \"evidence\": \"Lentiviral shRNA knockdown in CT26 cells with Western blot for phospho-Akt, NF-κB p65, Bcl-2 family members\",\n      \"pmids\": [\"24335275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ADP-ribosylation substrate linking ART1 to Akt activation not identified\", \"Results from a single cell line and single lab\", \"Whether this reflects enzymatic activity or scaffold function unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that human ARTC1 resides in the ER lumen and ADP-ribosylates GRP78/BiP during ER stress overturned the assumption that ARTC1 acts exclusively as an ecto-enzyme and established a role in the unfolded protein response.\",\n      \"evidence\": \"Subcellular fractionation, immunofluorescence, macro-domain pull-down for ADP-ribosylated proteins, ER stress induction\",\n      \"pmids\": [\"25292337\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ER-localized ARTC1 is activated by ER stress not mechanistically resolved\", \"Functional consequence of GRP78 ADP-ribosylation on chaperone activity not determined\", \"Reconciliation of GPI-anchored ecto-enzyme versus ER-resident forms across species incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Proteome-wide ADP-ribosylome profiling in ARTC1-KO mice revealed hundreds of substrates in muscle and heart and validated hemopexin as a bona fide target, establishing ART1 as a broad-specificity extracellular/surface ADP-ribosyltransferase.\",\n      \"evidence\": \"Mass spectrometry-based profiling comparing wild-type and ARTC1-KO mouse tissues\",\n      \"pmids\": [\"30110646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of ADP-ribosylation for most identified substrates unknown\", \"Whether all identified sites are direct ARTC1 targets or include indirect effects not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that tumor-expressed ART1 ADP-ribosylates P2X7R on CD8+ T cells to trigger NAD-induced cell death provided a direct immune-evasion mechanism and validated ART1 as a therapeutic target, with antibody blockade restoring anti-tumor immunity.\",\n      \"evidence\": \"In vitro ADP-ribosylation assay, ART1-KO mice, anti-ART1 antibody blockade in NSCLC and melanoma tumor models, flow cytometry of CD8+ T cell infiltration\",\n      \"pmids\": [\"35294260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ART1-mediated NICD operates in human tumors in situ not demonstrated\", \"Structural basis of ART1-P2X7R interaction not resolved\", \"Contribution of other ARTC family members to NICD not excluded\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of VAPB Arg50 as an ARTC1 substrate and ARTC3 as a stabilizing partner linked ART1 enzymatic activity to intracellular calcium homeostasis, revealing a regulatory circuit within the ARTC family.\",\n      \"evidence\": \"Co-immunoprecipitation of ARTC1-ARTC3, site-directed mutagenesis of VAPB Arg50, calcium imaging after ARTC1 knockdown\",\n      \"pmids\": [\"37381178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ARTC3-ARTC1 stabilization not determined\", \"Whether VAPB ADP-ribosylation affects ER-mitochondria contact sites not tested\", \"Tissue contexts beyond cell lines not explored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of ARTC1 catalysis and substrate selectivity, how the enzyme is partitioned between ER-luminal and GPI-anchored pools across tissues, and whether ART1-targeted therapies can be translated to human cancer immunotherapy.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of ARTC1\", \"No systematic comparison of ER versus cell-surface pools in human tissues\", \"Human clinical relevance of anti-ART1 immunotherapy not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 3, 4, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ARTC3\", \"ITGA7\", \"GRP78\", \"VAPB\", \"P2X7R\", \"HPX\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I made an error in the pathway section — I used a GO term instead of a Reactome pathway ID. Let me correct that.\n\n```json\n{\n  \"mechanistic_narrative\": \"ART1 (ARTC1) is a GPI-anchored or ER-resident arginine-specific mono-ADP-ribosyltransferase that uses NAD+ as a co-substrate to transfer ADP-ribose onto arginine residues of cell-surface, extracellular, and ER-luminal target proteins, thereby regulating integrin-mediated adhesion, ER stress responses, calcium homeostasis, and immune cell viability. ART1 modifies α7-integrin to enhance laminin binding, ADP-ribosylates the ER chaperone GRP78/BiP during the unfolded protein response, and modifies VAPB at Arg50 to maintain intracellular calcium homeostasis, with its enzymatic activity stabilized by interaction with ARTC3 [PMID:18939989, PMID:25292337, PMID:37381178]. Proteome-wide profiling in ARTC1-knockout mice identified hundreds of ADP-ribosylated substrates in skeletal muscle and heart, including hemopexin [PMID:30110646]. Tumor-expressed ART1 ADP-ribosylates P2X7R on CD8+ T cells, triggering NAD-induced cell death and enabling immune evasion, and genetic or antibody-mediated ART1 blockade restores anti-tumor immunity in murine cancer models [PMID:35294260].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that Art1 encodes a functional arginine-specific mono-ADP-ribosyltransferase resolved the molecular identity and enzymatic specificity of the gene product, placing it in the ecto-enzyme family with predominant cardiac and skeletal muscle expression.\",\n      \"evidence\": \"Molecular cloning, recombinant Art1-Fc fusion protein with in vitro enzymatic assay, Northern blot in mouse tissues\",\n      \"pmids\": [\"9841866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous substrates in muscle not identified\", \"Human ortholog localization not determined\", \"Catalytic mechanism and NAD+ binding site not structurally resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of mutant ARTC1 peptides as antigens recognized by CD4+ regulatory T cells in melanoma linked ART1 to tumor immunology for the first time, raising the question of whether ART1 enzymatic activity contributes to immune modulation.\",\n      \"evidence\": \"Expression cloning and functional T cell assays with 164mel melanoma-derived T cell clones\",\n      \"pmids\": [\"15728473\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether wild-type ARTC1 enzymatic activity modulates anti-tumor immunity was not tested\", \"Generalizability beyond a single melanoma line unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that myogenin/E-box and MEF-2/A-T-rich element cooperativity drives ART1 transcription in myotubes, and that ART1 ADP-ribosylates α7-integrin to enhance laminin binding, connected the enzyme's tissue-specific expression to a functional role in muscle cell-matrix adhesion.\",\n      \"evidence\": \"Promoter mutagenesis with reporter assays, EMSA, biochemical ADP-ribosylation and laminin-binding assays\",\n      \"pmids\": [\"18939989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of α7-integrin ADP-ribosylation for muscle function not tested\", \"Whether ADP-ribosylation is reversible in this context unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Loss-of-function studies in colon carcinoma cells revealed that ART1 sustains pro-survival Akt/NF-κB signaling and suppresses cisplatin-induced apoptosis, broadening ART1's role from muscle physiology to cancer cell survival.\",\n      \"evidence\": \"Lentiviral shRNA knockdown in CT26 cells with Western blot for phospho-Akt, NF-κB p65, Bcl-2 family members\",\n      \"pmids\": [\"24335275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ADP-ribosylation substrate linking ART1 to Akt activation not identified\", \"Results from a single cell line and single lab\", \"Whether this reflects enzymatic activity or scaffold function unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that human ARTC1 resides in the ER lumen and ADP-ribosylates GRP78/BiP during ER stress overturned the assumption that ARTC1 acts exclusively as an ecto-enzyme and established a role in the unfolded protein response.\",\n      \"evidence\": \"Subcellular fractionation, immunofluorescence, macro-domain pull-down for ADP-ribosylated proteins, ER stress induction\",\n      \"pmids\": [\"25292337\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ER-localized ARTC1 is activated by ER stress not mechanistically resolved\", \"Functional consequence of GRP78 ADP-ribosylation on chaperone activity not determined\", \"Reconciliation of GPI-anchored ecto-enzyme versus ER-resident forms across species incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Proteome-wide ADP-ribosylome profiling in ARTC1-KO mice revealed hundreds of substrates in muscle and heart and validated hemopexin as a bona fide target, establishing ART1 as a broad-specificity extracellular/surface ADP-ribosyltransferase.\",\n      \"evidence\": \"Mass spectrometry-based profiling comparing wild-type and ARTC1-KO mouse tissues\",\n      \"pmids\": [\"30110646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of ADP-ribosylation for most identified substrates unknown\", \"Whether all identified sites are direct ARTC1 targets or include indirect effects not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that tumor-expressed ART1 ADP-ribosylates P2X7R on CD8+ T cells to trigger NAD-induced cell death provided a direct immune-evasion mechanism and validated ART1 as a therapeutic target, with antibody blockade restoring anti-tumor immunity.\",\n      \"evidence\": \"In vitro ADP-ribosylation assay, ART1-KO mice, anti-ART1 antibody blockade in NSCLC and melanoma tumor models, flow cytometry of CD8+ T cell infiltration\",\n      \"pmids\": [\"35294260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ART1-mediated NICD operates in human tumors in situ not demonstrated\", \"Structural basis of ART1-P2X7R interaction not resolved\", \"Contribution of other ARTC family members to NICD not excluded\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of VAPB Arg50 as an ARTC1 substrate and ARTC3 as a stabilizing partner linked ART1 enzymatic activity to intracellular calcium homeostasis, revealing a regulatory circuit within the ARTC family.\",\n      \"evidence\": \"Co-immunoprecipitation of ARTC1-ARTC3, site-directed mutagenesis of VAPB Arg50, calcium imaging after ARTC1 knockdown\",\n      \"pmids\": [\"37381178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ARTC3-ARTC1 stabilization not determined\", \"Whether VAPB ADP-ribosylation affects ER-mitochondria contact sites not tested\", \"Tissue contexts beyond cell lines not explored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of ARTC1 catalysis and substrate selectivity, how the enzyme is partitioned between ER-luminal and GPI-anchored pools across tissues, and whether ART1-targeted therapies can be translated to human cancer immunotherapy.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of ARTC1\", \"No systematic comparison of ER versus cell-surface pools in human tissues\", \"Human clinical relevance of anti-ART1 immunotherapy not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 3, 4, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ARTC3\", \"ITGA7\", \"HSPA5\", \"VAPB\", \"P2X7R\", \"HPX\"],\n    \"other_free_text\": []\n  }\n}\n```"}