{"gene":"ATIC","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1996,"finding":"Human ATIC (purH gene product) encodes a bifunctional enzyme with two independent catalytic activities: AICAR transformylase (AICARFT) in the C-terminal 406 amino acids and IMP cyclohydrolase (IMPCHase) in the N-terminal 223 amino acids, as demonstrated by truncation mutants showing each activity can be expressed independently. Km values for AICAR and 10-formyltetrahydrofolate were determined as 16.8 µM and 60.2 µM respectively.","method":"Cloning, purification, steady-state kinetics, truncation mutagenesis, site-directed mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with truncation mutants and kinetic analysis of purified human enzyme","pmids":["8567683"],"is_preprint":false},{"year":2000,"finding":"ATIC-ALK fusion protein arising from inv(2)(p23q35) in ALCL fuses the amino-terminus of ATIC (including its homodimerization domain) to the intracellular portion of ALK, resulting in constitutive cytoplasmic tyrosine kinase activity and ATIC-mediated homodimerization of ALK, converting IL-3-dependent BaF3 cells to cytokine-independent growth.","method":"Inverse PCR, RT-PCR, transient expression in BaF3 cells, cytokine independence assay, subcellular localization","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — functional fusion characterization with multiple orthogonal methods, replicated in multiple independent ALCL cases across three labs","pmids":["10706887","10702393","10706082"],"is_preprint":false},{"year":2000,"finding":"Full-length ATIC-ALK cDNA expressed in mouse fibroblasts produces a ~96 kDa fusion protein that possesses constitutive tyrosine kinase activity, forms stable complexes with signaling proteins Grb2 and Shc, induces tyrosine-phosphorylation of Shc, and provokes oncogenic transformation.","method":"Expression in mouse fibroblasts, co-immunoprecipitation, tyrosine phosphorylation assay, transformation assay, 5'-RACE","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in a single study establishing mechanism of oncogenic signaling","pmids":["10706082"],"is_preprint":false},{"year":2002,"finding":"Detailed kinetic mechanism of human ATIC established: the rate-limiting step is tetrahydrofolate release from the formyltransferase active site (2.9 s⁻¹); the reverse transformylase reaction (6.7 s⁻¹) is faster than forward; the cyclohydrolase reaction is essentially unidirectional driving IMP production; and there is no kinetic evidence for substrate channeling of the FAICAR intermediate between the two active sites.","method":"Rapid chemical quench, stopped-flow absorbance, steady-state kinetics, kinetic simulation with KINSIM","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous pre-steady-state and steady-state kinetic analysis with multiple orthogonal methods on purified human enzyme","pmids":["11948179"],"is_preprint":false},{"year":2004,"finding":"ATIC is the enzyme responsible for AICAR transformylase and IMP cyclohydrolase activities in human cells; loss-of-function mutations (K426R in the transformylase region, and a frameshift) cause AICA-ribosiduria with massive AICAR/ZMP accumulation. The K426R recombinant protein completely lacks AICAR transformylase activity while IMP cyclohydrolase retains ~40% activity.","method":"Patient fibroblast incubation with AICA-riboside showing AICAR accumulation, ATIC sequencing, recombinant protein expression and enzyme activity assay","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1–2 — biochemical reconstitution with patient fibroblasts and recombinant mutant protein; defines specific catalytic residue K426 for transformylase activity","pmids":["15114530"],"is_preprint":false},{"year":2000,"finding":"Avian ATIC (PurH) protein directly binds a muscle-specific splicing enhancer (MSE3) RNA element in cardiac troponin T pre-mRNA, and binding affinity of both the native MSE3 complex and recombinant PurH correlates directly with functional activation of muscle-specific exon inclusion in vivo, revealing a moonlighting RNA-binding/splicing regulatory role for ATIC.","method":"Purification from muscle extracts, recombinant protein binding assays, in vivo splicing reporter assays, affinity correlation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding and functional correlation shown, but single lab and avian ortholog","pmids":["10801888"],"is_preprint":false},{"year":2011,"finding":"ATIC mutations causing AICA-ribosiduria destabilize purinosome assembly in patient fibroblasts, demonstrating that structurally intact ATIC complexes are required for de novo purine synthesis purinosome formation. The ability to form purinosomes correlated with clinical phenotype severity.","method":"Immunolabeling of DNPS enzymes, confocal fluorescence microscopy in patient fibroblasts vs. controls across multiple cell lines","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct imaging with patient-derived cells and multiple cell lines; single lab","pmids":["22180458"],"is_preprint":false},{"year":2015,"finding":"Inhibition of ATIC homodimerization blocks the ninth step of de novo purine biosynthesis, causing accumulation of endogenous ZMP (ATIC's substrate), which in turn activates AMPK and its downstream signaling pathways in cells and in an in vivo mouse model for metabolic disorders.","method":"ATIC homodimerization inhibitor treatment, ZMP measurement, AMPK activation assay, in vivo mouse metabolic disorder model","journal":"Chemistry & biology","confidence":"High","confidence_rationale":"Tier 2 — chemical inhibitor with cellular and in vivo validation; mechanistic link between ATIC activity, ZMP accumulation, and AMPK activation established with multiple methods","pmids":["26144885"],"is_preprint":false},{"year":2015,"finding":"ATIC accumulates in the Golgi/endosome fraction after insulin stimulation and interacts with the insulin receptor (IR) complex. siRNA knockdown of ATIC affects IR tyrosine phosphorylation and endocytosis; ATIC knockdown increases AMPK-Thr172 phosphorylation in IR complexes, and AICAR (ATIC's substrate) increases IR endocytosis.","method":"In vitro reconstitution system, siRNA knockdown, subcellular fractionation, insulin receptor tyrosine phosphorylation assay, endocytosis assay, bioinformatic screen of Golgi/endosome fractions","journal":"Molecular & cellular proteomics","confidence":"Medium","confidence_rationale":"Tier 2–3 — partial knockdown with reconstitution system; single lab with multiple endpoints","pmids":["25687571"],"is_preprint":false},{"year":2017,"finding":"ATIC knockdown in hepatocellular carcinoma cells suppresses AMPK activation, thereby activating mTOR-S6K1-S6 signaling to support tumor cell growth and motility; Compound C (AMPK inhibitor) rescue confirmed AMPK dependence of the phenotype.","method":"Lentivirus-mediated knockdown, proliferation/colony/migration assays, western blot, Compound C rescue","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2–3 — KD with defined pathway placement via rescue experiment; single lab","pmids":["29246230"],"is_preprint":false},{"year":2017,"finding":"ATIC depletion (siRNA) or inhibition of its transformylase activity shifts cancer cells to G2/M phase, depletes cellular ATP without causing direct DNA damage, and sensitizes cells to ionizing radiation by increasing DNA double-strand breaks and delaying their repair; exogenous ATP supplementation rescues the DNA repair phenotype, implicating ATP depletion as the mechanism.","method":"siRNA knockdown, small molecule inhibitors, clonogenic survival assay, neutral comet assay, γH2AX staining, cell cycle analysis, exogenous ATP rescue","journal":"International journal of radiation oncology, biology, physics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods with mechanistic rescue; single lab","pmids":["29029884"],"is_preprint":false},{"year":2017,"finding":"Analysis of substrate binding using S10W mutation (blocks IMPCHase active site) and truncation mutants reveals that nucleotide ligands bind selectively at one of the two active sites; XMP uniquely shows cooperative binding with communication between symmetrically-related IMPCHase active sites in the ATIC dimer; no evidence for cooperative binding in the AICARFT site.","method":"Site-directed mutagenesis, truncation mutants, isothermal titration calorimetry (ITC)","journal":"Biochimica et biophysica acta. Proteins and proteomics","confidence":"Medium","confidence_rationale":"Tier 1 — mutagenesis plus biophysical binding measurements; single lab","pmids":["29042184"],"is_preprint":false},{"year":2022,"finding":"VSMC-specific or global knockout of Atic in mice inhibits VSMC proliferation, reduces de novo purine synthesis, and attenuates arterial neointima formation in mouse models of atherosclerosis and arterial restenosis, establishing ATIC-associated purine synthesis as required for VSMC proliferative phenotype in arterial disease.","method":"Global and VSMC-specific Atic knockout mice, arterial injury models, LC-MS/MS metabolomics, cell proliferation assays","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic KO with two disease models and metabolomic validation; strong phenotypic evidence","pmids":["36073366"],"is_preprint":false},{"year":2022,"finding":"ATIC promotes cell growth and migration in lung adenocarcinoma by upregulating Myc expression; Myc knockdown abrogates the pro-growth and pro-migratory effects of ATIC overexpression, placing ATIC upstream of Myc in a regulatory axis.","method":"siRNA knockdown, overexpression, rescue (Myc knockdown) experiments, proliferation/migration/invasion assays in HCC827 and NCI-H1435 cells","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 3 — KD/OE with rescue experiment defining pathway position; single lab","pmids":["35251351"],"is_preprint":false},{"year":2023,"finding":"ATIC's substrate AICAr (AICAR precursor) regulates LRRK2 mRNA levels in a cell-type-specific manner via AUF1-mediated mRNA decay: upon AICAr treatment, the RNA-binding protein AUF1 is recruited to AU-rich elements in LRRK2 mRNA, recruiting the decapping enzyme complex DCP1/2 leading to LRRK2 mRNA degradation; this suppresses LRRK2 expression and rescues dopaminergic neurodegeneration in Drosophila and mouse PD models.","method":"Cell-based assays, RNA immunoprecipitation, mRNA decay assays, Drosophila and mouse PD models, LRRK2 expression measurements","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway established with in vitro and in vivo validation; but ATIC's direct role is via its substrate rather than direct catalytic action on LRRK2","pmids":["37366237"],"is_preprint":false},{"year":2024,"finding":"lncRNA ZFAS1 directly interacts with ATIC and regulates its transcription; ATIC knockdown suppresses hepatocellular carcinoma cell proliferation and migration through the PI3K/AKT signaling pathway; SC79 (AKT activator) partially restores the effects of ZFAS1/ATIC knockdown.","method":"Luciferase reporter assay, siRNA knockdown, colony formation, CCK-8, wound healing and Transwell assays, in vivo xenograft model, AKT activator rescue","journal":"Journal of cancer research and clinical oncology","confidence":"Medium","confidence_rationale":"Tier 3 — KD with rescue and in vivo validation; single lab; direct ZFAS1-ATIC interaction shown by luciferase assay","pmids":["39001904"],"is_preprint":false},{"year":2025,"finding":"ATIC deletion in zebrafish and siRNA knockdown in C2C12 myoblasts causes AICAR accumulation and IMP synthesis blockage, leading to mitochondrial structural damage, dysfunction of respiratory chain complexes I-V, ROS burst, and skeletal muscle atrophy through activation of the ubiquitin-proteasome system.","method":"CRISPR/Cas9 zebrafish knockout, siRNA knockdown in C2C12 cells, metabolomic analysis, mitochondrial function assays, transcriptome sequencing","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KO and in vitro KD with mechanistic pathway (AICAR accumulation → OXPHOS impairment → muscle atrophy) validated by multiple methods","pmids":["40623538"],"is_preprint":false},{"year":2025,"finding":"lncRNA TPT1-AS1 physically interacts with CBP (CREB-binding protein), leading to loss of H3K27Ac at the ATIC promoter, thereby suppressing ATIC transcription and blocking de novo purine biosynthesis (IMP synthesis) in breast cancer cells; ATIC knockdown inhibits breast cancer tumor growth and metastasis.","method":"Mass spectrometry identification, ChIP assay for H3K27Ac, siRNA knockdown, in vivo xenograft model, IMP measurement","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 — epigenetic mechanism of ATIC regulation established with ChIP and mass spectrometry; single lab","pmids":["40091780"],"is_preprint":false},{"year":2026,"finding":"ATIC knockdown in upper tract urothelial carcinoma cells downregulates B7-H3 (CD276), PRNP, RAC2, and NT5E (CD73); ATIC silencing modulates mTOR, AKT, ERK, and p38 phosphorylation; B7-H3 may lie upstream of PRNP and RAC2 in this axis. TMT proteomics identified these as downstream effectors.","method":"TMT-based quantitative proteomics, RNA interference, functional assays (proliferation, migration, invasion), western blot for signaling","journal":"Cancer genomics & proteomics","confidence":"Medium","confidence_rationale":"Tier 2–3 — proteomics-based pathway identification with functional validation; single lab","pmids":["41771578"],"is_preprint":false}],"current_model":"ATIC is a homodimeric bifunctional enzyme that catalyzes the penultimate (AICAR transformylase) and final (IMP cyclohydrolase) steps of de novo purine biosynthesis via spatially distinct active sites without substrate channeling; its substrate ZMP/AICAR allosterically activates AMPK, positioning ATIC as a key regulator of the AMPK-mTOR signaling axis; ATIC's homodimerization domain drives constitutive ALK kinase activation in oncogenic fusion proteins (ATIC-ALK); and ATIC additionally moonlights as an RNA-binding protein regulating muscle-specific alternative splicing."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing that a single human gene encodes both terminal steps of de novo purine biosynthesis resolved the long-standing question of whether AICAR transformylase and IMP cyclohydrolase are separate or fused enzymes, and localized each activity to an independent protein domain.","evidence":"Truncation mutagenesis and steady-state kinetics of purified recombinant human ATIC","pmids":["8567683"],"confidence":"High","gaps":["No structural information on domain arrangement at this stage","Quaternary structure not yet characterized"]},{"year":2000,"claim":"Discovery that the ATIC homodimerization domain fused to ALK creates a constitutively active oncogenic kinase established a direct role for ATIC's oligomerization interface in driving anaplastic large-cell lymphoma, and showed the fusion protein engages Grb2/Shc signaling to induce transformation.","evidence":"Identification of inv(2)(p23q35) in ALCL patients; expression of ATIC-ALK in BaF3 and fibroblast cells with co-IP, transformation assays, and cytokine-independence assays across three independent laboratories","pmids":["10706887","10702393","10706082"],"confidence":"High","gaps":["Structural basis for how ATIC dimerization activates ALK kinase not resolved","Relative contribution of ATIC enzymatic loss vs. ALK gain to oncogenesis unclear"]},{"year":2000,"claim":"Identification of ATIC (avian PurH) as a direct RNA-binding protein that activates muscle-specific exon inclusion revealed an unexpected moonlighting function beyond purine metabolism.","evidence":"Purification from muscle extracts, recombinant protein-RNA binding assays, and in vivo splicing reporter assays in avian system","pmids":["10801888"],"confidence":"Medium","gaps":["Only demonstrated with avian ortholog; not confirmed for human ATIC","Structural basis for RNA binding unknown","Relationship between enzymatic and splicing activities not addressed"]},{"year":2002,"claim":"Pre-steady-state kinetic dissection showed that tetrahydrofolate release is rate-limiting and that the two active sites operate independently without substrate channeling, establishing the catalytic logic of the bifunctional enzyme.","evidence":"Rapid chemical quench, stopped-flow absorbance, and kinetic simulation (KINSIM) on purified human ATIC","pmids":["11948179"],"confidence":"High","gaps":["Structural basis for lack of channeling not yet visualized","Whether cellular purinosome context alters channeling behavior unknown"]},{"year":2004,"claim":"Identification of causative ATIC mutations in AICA-ribosiduria patients—with recombinant K426R protein lacking transformylase activity—proved ATIC is essential for purine biosynthesis in humans and established K426 as a critical catalytic residue.","evidence":"Patient fibroblast metabolite analysis, ATIC sequencing, and recombinant mutant enzyme activity assays","pmids":["15114530"],"confidence":"High","gaps":["Extremely rare disease with very few patients characterized","IMP cyclohydrolase retained partial activity—independent pathological contribution of each domain unclear"]},{"year":2011,"claim":"Patient-derived ATIC mutant fibroblasts showed impaired purinosome assembly, establishing that structurally intact ATIC is required for the higher-order metabolon organizing de novo purine synthesis.","evidence":"Immunolabeling and confocal microscopy of de novo purine synthesis enzymes in patient vs. control fibroblasts","pmids":["22180458"],"confidence":"Medium","gaps":["Whether ATIC is a scaffold for purinosome nucleation or its loss indirectly destabilizes the complex is unresolved","Single lab observation"]},{"year":2015,"claim":"Chemical inhibition of ATIC homodimerization caused ZMP accumulation and AMPK activation both in cells and in vivo, establishing a direct metabolic link from ATIC catalytic flux to AMPK-dependent energy sensing.","evidence":"Small-molecule ATIC homodimerization inhibitor with ZMP and AMPK measurements in cells and a mouse metabolic disorder model","pmids":["26144885"],"confidence":"High","gaps":["Inhibitor selectivity not fully profiled; off-target effects possible","Whether ZMP-AMPK axis fully accounts for downstream effects not delineated"]},{"year":2017,"claim":"Multiple studies converged on ATIC's role in cancer cell proliferation: ATIC knockdown suppresses AMPK and activates mTOR-S6K1 in hepatocellular carcinoma, while ATIC depletion depletes ATP and sensitizes cancer cells to ionizing radiation by impairing DNA repair, and cooperative XMP binding between IMPCHase active sites was revealed by ITC.","evidence":"Lentiviral/siRNA knockdown with Compound C rescue in HCC cells; siRNA plus small-molecule inhibitors with ATP rescue and γH2AX/comet assays in cancer cells; ITC with site-directed mutants","pmids":["29246230","29029884","29042184"],"confidence":"Medium","gaps":["Direction of ATIC–AMPK relationship appears opposite between studies (KD suppresses AMPK in HCC vs. KD increases AMPK in inhibitor study)—context dependence unresolved","No structural basis for XMP cooperativity"]},{"year":2022,"claim":"Genetic knockout of Atic in vascular smooth muscle cells in mice demonstrated that ATIC-dependent purine synthesis is required for VSMC proliferation and arterial neointima formation, translating the enzyme's metabolic role to cardiovascular disease.","evidence":"Global and VSMC-specific Atic knockout mice with arterial injury models and LC-MS/MS metabolomics","pmids":["36073366"],"confidence":"High","gaps":["Whether AMPK activation or purine depletion is the dominant anti-proliferative mechanism in VSMCs not separated","No pharmacological validation in vascular disease models"]},{"year":2023,"claim":"The ATIC substrate precursor AICAr was shown to suppress LRRK2 expression via AUF1-mediated mRNA decay, rescuing dopaminergic neurodegeneration in PD models—extending ATIC's metabolic influence to neurodegeneration through metabolite-driven gene regulation.","evidence":"RNA immunoprecipitation, mRNA decay assays, Drosophila and mouse PD models","pmids":["37366237"],"confidence":"Medium","gaps":["ATIC itself was not directly manipulated; effect attributed to its substrate AICAR/AICAr","Cell-type specificity of LRRK2 regulation not fully defined"]},{"year":2025,"claim":"ATIC deletion in zebrafish and knockdown in myoblasts revealed that AICAR accumulation from ATIC loss causes mitochondrial respiratory chain dysfunction and skeletal muscle atrophy via ubiquitin-proteasome activation, establishing a purine-mitochondria-proteostasis axis.","evidence":"CRISPR/Cas9 zebrafish knockout, siRNA in C2C12 cells, metabolomics, mitochondrial function assays, transcriptomics","pmids":["40623538"],"confidence":"Medium","gaps":["Whether AICAR directly damages mitochondria or acts through AMPK hyperactivation not resolved","Single lab; no rescue with exogenous purines reported"]},{"year":null,"claim":"Key unresolved questions include: the structural basis for ATIC's role in purinosome assembly; whether the apparently contradictory directions of AMPK modulation upon ATIC loss reflect tissue-specific contexts or methodological differences; whether the RNA-binding/splicing function is conserved in mammals and its relationship to enzymatic activity; and the precise mechanism linking ATIC to PI3K/AKT signaling independent of AMPK.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of ATIC within a purinosome","AMPK activation vs. suppression upon ATIC loss not reconciled across tissues","Mammalian splicing regulatory role not confirmed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,3,4]},{"term_id":"GO:0016853","term_label":"isomerase activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[5]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,7]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,4,7,12,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,8,9]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,2,9,13]}],"complexes":["purinosome","ATIC homodimer"],"partners":["ALK","GRB2","SHC1","INSR","ZFAS1","AUF1"],"other_free_text":[]},"mechanistic_narrative":"ATIC is a homodimeric bifunctional enzyme that catalyzes the penultimate and final steps of de novo purine biosynthesis—AICAR transformylase (C-terminal domain) and IMP cyclohydrolase (N-terminal domain)—with each catalytic activity operating at spatially distinct active sites without substrate channeling, and with tetrahydrofolate release as the rate-limiting step [PMID:8567683, PMID:11948179]. Loss-of-function mutations cause AICA-ribosiduria with massive ZMP/AICAR accumulation, and structurally intact ATIC is required for purinosome assembly [PMID:15114530, PMID:22180458]. Pharmacological or genetic disruption of ATIC triggers ZMP accumulation that activates AMPK signaling—linking purine flux to mTOR, PI3K/AKT, and metabolic regulation—while ATIC deletion in vivo impairs de novo purine supply required for vascular smooth muscle cell proliferation and causes mitochondrial dysfunction with skeletal muscle atrophy [PMID:26144885, PMID:36073366, PMID:40623538]. The ATIC homodimerization domain drives constitutive ALK kinase activation in the oncogenic ATIC-ALK fusion found in anaplastic large-cell lymphoma [PMID:10706887, PMID:10706082]."},"prefetch_data":{"uniprot":{"accession":"P31939","full_name":"Bifunctional purine biosynthesis protein ATIC","aliases":["AICAR transformylase/inosine monophosphate cyclohydrolase","ATIC"],"length_aa":592,"mass_kda":64.6,"function":"Bifunctional enzyme that catalyzes the last two steps of purine biosynthesis (PubMed:11948179, PubMed:14756554). Acts as a transformylase that incorporates a formyl group to the AMP analog AICAR (5-amino-1-(5-phospho-beta-D-ribosyl)imidazole-4-carboxamide) to produce the intermediate formyl-AICAR (FAICAR) (PubMed:10985775, PubMed:11948179, PubMed:9378707). Can use both 10-formyldihydrofolate and 10-formyltetrahydrofolate as the formyl donor in this reaction (PubMed:10985775). Also catalyzes the cyclization of FAICAR to inosine monophosphate (IMP) (PubMed:11948179, PubMed:14756554). Is able to convert thio-AICAR to 6-mercaptopurine ribonucleotide, an inhibitor of purine biosynthesis used in the treatment of human leukemias (PubMed:10985775). 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Km values for AICAR and 10-formyltetrahydrofolate were determined as 16.8 µM and 60.2 µM respectively.\",\n      \"method\": \"Cloning, purification, steady-state kinetics, truncation mutagenesis, site-directed mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with truncation mutants and kinetic analysis of purified human enzyme\",\n      \"pmids\": [\"8567683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ATIC-ALK fusion protein arising from inv(2)(p23q35) in ALCL fuses the amino-terminus of ATIC (including its homodimerization domain) to the intracellular portion of ALK, resulting in constitutive cytoplasmic tyrosine kinase activity and ATIC-mediated homodimerization of ALK, converting IL-3-dependent BaF3 cells to cytokine-independent growth.\",\n      \"method\": \"Inverse PCR, RT-PCR, transient expression in BaF3 cells, cytokine independence assay, subcellular localization\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional fusion characterization with multiple orthogonal methods, replicated in multiple independent ALCL cases across three labs\",\n      \"pmids\": [\"10706887\", \"10702393\", \"10706082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Full-length ATIC-ALK cDNA expressed in mouse fibroblasts produces a ~96 kDa fusion protein that possesses constitutive tyrosine kinase activity, forms stable complexes with signaling proteins Grb2 and Shc, induces tyrosine-phosphorylation of Shc, and provokes oncogenic transformation.\",\n      \"method\": \"Expression in mouse fibroblasts, co-immunoprecipitation, tyrosine phosphorylation assay, transformation assay, 5'-RACE\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single study establishing mechanism of oncogenic signaling\",\n      \"pmids\": [\"10706082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Detailed kinetic mechanism of human ATIC established: the rate-limiting step is tetrahydrofolate release from the formyltransferase active site (2.9 s⁻¹); the reverse transformylase reaction (6.7 s⁻¹) is faster than forward; the cyclohydrolase reaction is essentially unidirectional driving IMP production; and there is no kinetic evidence for substrate channeling of the FAICAR intermediate between the two active sites.\",\n      \"method\": \"Rapid chemical quench, stopped-flow absorbance, steady-state kinetics, kinetic simulation with KINSIM\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous pre-steady-state and steady-state kinetic analysis with multiple orthogonal methods on purified human enzyme\",\n      \"pmids\": [\"11948179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATIC is the enzyme responsible for AICAR transformylase and IMP cyclohydrolase activities in human cells; loss-of-function mutations (K426R in the transformylase region, and a frameshift) cause AICA-ribosiduria with massive AICAR/ZMP accumulation. The K426R recombinant protein completely lacks AICAR transformylase activity while IMP cyclohydrolase retains ~40% activity.\",\n      \"method\": \"Patient fibroblast incubation with AICA-riboside showing AICAR accumulation, ATIC sequencing, recombinant protein expression and enzyme activity assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical reconstitution with patient fibroblasts and recombinant mutant protein; defines specific catalytic residue K426 for transformylase activity\",\n      \"pmids\": [\"15114530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Avian ATIC (PurH) protein directly binds a muscle-specific splicing enhancer (MSE3) RNA element in cardiac troponin T pre-mRNA, and binding affinity of both the native MSE3 complex and recombinant PurH correlates directly with functional activation of muscle-specific exon inclusion in vivo, revealing a moonlighting RNA-binding/splicing regulatory role for ATIC.\",\n      \"method\": \"Purification from muscle extracts, recombinant protein binding assays, in vivo splicing reporter assays, affinity correlation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding and functional correlation shown, but single lab and avian ortholog\",\n      \"pmids\": [\"10801888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ATIC mutations causing AICA-ribosiduria destabilize purinosome assembly in patient fibroblasts, demonstrating that structurally intact ATIC complexes are required for de novo purine synthesis purinosome formation. The ability to form purinosomes correlated with clinical phenotype severity.\",\n      \"method\": \"Immunolabeling of DNPS enzymes, confocal fluorescence microscopy in patient fibroblasts vs. controls across multiple cell lines\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct imaging with patient-derived cells and multiple cell lines; single lab\",\n      \"pmids\": [\"22180458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Inhibition of ATIC homodimerization blocks the ninth step of de novo purine biosynthesis, causing accumulation of endogenous ZMP (ATIC's substrate), which in turn activates AMPK and its downstream signaling pathways in cells and in an in vivo mouse model for metabolic disorders.\",\n      \"method\": \"ATIC homodimerization inhibitor treatment, ZMP measurement, AMPK activation assay, in vivo mouse metabolic disorder model\",\n      \"journal\": \"Chemistry & biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — chemical inhibitor with cellular and in vivo validation; mechanistic link between ATIC activity, ZMP accumulation, and AMPK activation established with multiple methods\",\n      \"pmids\": [\"26144885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ATIC accumulates in the Golgi/endosome fraction after insulin stimulation and interacts with the insulin receptor (IR) complex. siRNA knockdown of ATIC affects IR tyrosine phosphorylation and endocytosis; ATIC knockdown increases AMPK-Thr172 phosphorylation in IR complexes, and AICAR (ATIC's substrate) increases IR endocytosis.\",\n      \"method\": \"In vitro reconstitution system, siRNA knockdown, subcellular fractionation, insulin receptor tyrosine phosphorylation assay, endocytosis assay, bioinformatic screen of Golgi/endosome fractions\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — partial knockdown with reconstitution system; single lab with multiple endpoints\",\n      \"pmids\": [\"25687571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ATIC knockdown in hepatocellular carcinoma cells suppresses AMPK activation, thereby activating mTOR-S6K1-S6 signaling to support tumor cell growth and motility; Compound C (AMPK inhibitor) rescue confirmed AMPK dependence of the phenotype.\",\n      \"method\": \"Lentivirus-mediated knockdown, proliferation/colony/migration assays, western blot, Compound C rescue\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — KD with defined pathway placement via rescue experiment; single lab\",\n      \"pmids\": [\"29246230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ATIC depletion (siRNA) or inhibition of its transformylase activity shifts cancer cells to G2/M phase, depletes cellular ATP without causing direct DNA damage, and sensitizes cells to ionizing radiation by increasing DNA double-strand breaks and delaying their repair; exogenous ATP supplementation rescues the DNA repair phenotype, implicating ATP depletion as the mechanism.\",\n      \"method\": \"siRNA knockdown, small molecule inhibitors, clonogenic survival assay, neutral comet assay, γH2AX staining, cell cycle analysis, exogenous ATP rescue\",\n      \"journal\": \"International journal of radiation oncology, biology, physics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with mechanistic rescue; single lab\",\n      \"pmids\": [\"29029884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Analysis of substrate binding using S10W mutation (blocks IMPCHase active site) and truncation mutants reveals that nucleotide ligands bind selectively at one of the two active sites; XMP uniquely shows cooperative binding with communication between symmetrically-related IMPCHase active sites in the ATIC dimer; no evidence for cooperative binding in the AICARFT site.\",\n      \"method\": \"Site-directed mutagenesis, truncation mutants, isothermal titration calorimetry (ITC)\",\n      \"journal\": \"Biochimica et biophysica acta. Proteins and proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus biophysical binding measurements; single lab\",\n      \"pmids\": [\"29042184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"VSMC-specific or global knockout of Atic in mice inhibits VSMC proliferation, reduces de novo purine synthesis, and attenuates arterial neointima formation in mouse models of atherosclerosis and arterial restenosis, establishing ATIC-associated purine synthesis as required for VSMC proliferative phenotype in arterial disease.\",\n      \"method\": \"Global and VSMC-specific Atic knockout mice, arterial injury models, LC-MS/MS metabolomics, cell proliferation assays\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic KO with two disease models and metabolomic validation; strong phenotypic evidence\",\n      \"pmids\": [\"36073366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ATIC promotes cell growth and migration in lung adenocarcinoma by upregulating Myc expression; Myc knockdown abrogates the pro-growth and pro-migratory effects of ATIC overexpression, placing ATIC upstream of Myc in a regulatory axis.\",\n      \"method\": \"siRNA knockdown, overexpression, rescue (Myc knockdown) experiments, proliferation/migration/invasion assays in HCC827 and NCI-H1435 cells\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — KD/OE with rescue experiment defining pathway position; single lab\",\n      \"pmids\": [\"35251351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ATIC's substrate AICAr (AICAR precursor) regulates LRRK2 mRNA levels in a cell-type-specific manner via AUF1-mediated mRNA decay: upon AICAr treatment, the RNA-binding protein AUF1 is recruited to AU-rich elements in LRRK2 mRNA, recruiting the decapping enzyme complex DCP1/2 leading to LRRK2 mRNA degradation; this suppresses LRRK2 expression and rescues dopaminergic neurodegeneration in Drosophila and mouse PD models.\",\n      \"method\": \"Cell-based assays, RNA immunoprecipitation, mRNA decay assays, Drosophila and mouse PD models, LRRK2 expression measurements\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway established with in vitro and in vivo validation; but ATIC's direct role is via its substrate rather than direct catalytic action on LRRK2\",\n      \"pmids\": [\"37366237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"lncRNA ZFAS1 directly interacts with ATIC and regulates its transcription; ATIC knockdown suppresses hepatocellular carcinoma cell proliferation and migration through the PI3K/AKT signaling pathway; SC79 (AKT activator) partially restores the effects of ZFAS1/ATIC knockdown.\",\n      \"method\": \"Luciferase reporter assay, siRNA knockdown, colony formation, CCK-8, wound healing and Transwell assays, in vivo xenograft model, AKT activator rescue\",\n      \"journal\": \"Journal of cancer research and clinical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — KD with rescue and in vivo validation; single lab; direct ZFAS1-ATIC interaction shown by luciferase assay\",\n      \"pmids\": [\"39001904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATIC deletion in zebrafish and siRNA knockdown in C2C12 myoblasts causes AICAR accumulation and IMP synthesis blockage, leading to mitochondrial structural damage, dysfunction of respiratory chain complexes I-V, ROS burst, and skeletal muscle atrophy through activation of the ubiquitin-proteasome system.\",\n      \"method\": \"CRISPR/Cas9 zebrafish knockout, siRNA knockdown in C2C12 cells, metabolomic analysis, mitochondrial function assays, transcriptome sequencing\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO and in vitro KD with mechanistic pathway (AICAR accumulation → OXPHOS impairment → muscle atrophy) validated by multiple methods\",\n      \"pmids\": [\"40623538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"lncRNA TPT1-AS1 physically interacts with CBP (CREB-binding protein), leading to loss of H3K27Ac at the ATIC promoter, thereby suppressing ATIC transcription and blocking de novo purine biosynthesis (IMP synthesis) in breast cancer cells; ATIC knockdown inhibits breast cancer tumor growth and metastasis.\",\n      \"method\": \"Mass spectrometry identification, ChIP assay for H3K27Ac, siRNA knockdown, in vivo xenograft model, IMP measurement\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epigenetic mechanism of ATIC regulation established with ChIP and mass spectrometry; single lab\",\n      \"pmids\": [\"40091780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ATIC knockdown in upper tract urothelial carcinoma cells downregulates B7-H3 (CD276), PRNP, RAC2, and NT5E (CD73); ATIC silencing modulates mTOR, AKT, ERK, and p38 phosphorylation; B7-H3 may lie upstream of PRNP and RAC2 in this axis. TMT proteomics identified these as downstream effectors.\",\n      \"method\": \"TMT-based quantitative proteomics, RNA interference, functional assays (proliferation, migration, invasion), western blot for signaling\",\n      \"journal\": \"Cancer genomics & proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — proteomics-based pathway identification with functional validation; single lab\",\n      \"pmids\": [\"41771578\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATIC is a homodimeric bifunctional enzyme that catalyzes the penultimate (AICAR transformylase) and final (IMP cyclohydrolase) steps of de novo purine biosynthesis via spatially distinct active sites without substrate channeling; its substrate ZMP/AICAR allosterically activates AMPK, positioning ATIC as a key regulator of the AMPK-mTOR signaling axis; ATIC's homodimerization domain drives constitutive ALK kinase activation in oncogenic fusion proteins (ATIC-ALK); and ATIC additionally moonlights as an RNA-binding protein regulating muscle-specific alternative splicing.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ATIC is a homodimeric bifunctional enzyme that catalyzes the penultimate and final steps of de novo purine biosynthesis—AICAR transformylase (C-terminal domain) and IMP cyclohydrolase (N-terminal domain)—with each catalytic activity operating at spatially distinct active sites without substrate channeling, and with tetrahydrofolate release as the rate-limiting step [PMID:8567683, PMID:11948179]. Loss-of-function mutations cause AICA-ribosiduria with massive ZMP/AICAR accumulation, and structurally intact ATIC is required for purinosome assembly [PMID:15114530, PMID:22180458]. Pharmacological or genetic disruption of ATIC triggers ZMP accumulation that activates AMPK signaling—linking purine flux to mTOR, PI3K/AKT, and metabolic regulation—while ATIC deletion in vivo impairs de novo purine supply required for vascular smooth muscle cell proliferation and causes mitochondrial dysfunction with skeletal muscle atrophy [PMID:26144885, PMID:36073366, PMID:40623538]. The ATIC homodimerization domain drives constitutive ALK kinase activation in the oncogenic ATIC-ALK fusion found in anaplastic large-cell lymphoma [PMID:10706887, PMID:10706082].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that a single human gene encodes both terminal steps of de novo purine biosynthesis resolved the long-standing question of whether AICAR transformylase and IMP cyclohydrolase are separate or fused enzymes, and localized each activity to an independent protein domain.\",\n      \"evidence\": \"Truncation mutagenesis and steady-state kinetics of purified recombinant human ATIC\",\n      \"pmids\": [\"8567683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural information on domain arrangement at this stage\", \"Quaternary structure not yet characterized\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Discovery that the ATIC homodimerization domain fused to ALK creates a constitutively active oncogenic kinase established a direct role for ATIC's oligomerization interface in driving anaplastic large-cell lymphoma, and showed the fusion protein engages Grb2/Shc signaling to induce transformation.\",\n      \"evidence\": \"Identification of inv(2)(p23q35) in ALCL patients; expression of ATIC-ALK in BaF3 and fibroblast cells with co-IP, transformation assays, and cytokine-independence assays across three independent laboratories\",\n      \"pmids\": [\"10706887\", \"10702393\", \"10706082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for how ATIC dimerization activates ALK kinase not resolved\", \"Relative contribution of ATIC enzymatic loss vs. ALK gain to oncogenesis unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of ATIC (avian PurH) as a direct RNA-binding protein that activates muscle-specific exon inclusion revealed an unexpected moonlighting function beyond purine metabolism.\",\n      \"evidence\": \"Purification from muscle extracts, recombinant protein-RNA binding assays, and in vivo splicing reporter assays in avian system\",\n      \"pmids\": [\"10801888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only demonstrated with avian ortholog; not confirmed for human ATIC\", \"Structural basis for RNA binding unknown\", \"Relationship between enzymatic and splicing activities not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Pre-steady-state kinetic dissection showed that tetrahydrofolate release is rate-limiting and that the two active sites operate independently without substrate channeling, establishing the catalytic logic of the bifunctional enzyme.\",\n      \"evidence\": \"Rapid chemical quench, stopped-flow absorbance, and kinetic simulation (KINSIM) on purified human ATIC\",\n      \"pmids\": [\"11948179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for lack of channeling not yet visualized\", \"Whether cellular purinosome context alters channeling behavior unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of causative ATIC mutations in AICA-ribosiduria patients—with recombinant K426R protein lacking transformylase activity—proved ATIC is essential for purine biosynthesis in humans and established K426 as a critical catalytic residue.\",\n      \"evidence\": \"Patient fibroblast metabolite analysis, ATIC sequencing, and recombinant mutant enzyme activity assays\",\n      \"pmids\": [\"15114530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Extremely rare disease with very few patients characterized\", \"IMP cyclohydrolase retained partial activity—independent pathological contribution of each domain unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Patient-derived ATIC mutant fibroblasts showed impaired purinosome assembly, establishing that structurally intact ATIC is required for the higher-order metabolon organizing de novo purine synthesis.\",\n      \"evidence\": \"Immunolabeling and confocal microscopy of de novo purine synthesis enzymes in patient vs. control fibroblasts\",\n      \"pmids\": [\"22180458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ATIC is a scaffold for purinosome nucleation or its loss indirectly destabilizes the complex is unresolved\", \"Single lab observation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Chemical inhibition of ATIC homodimerization caused ZMP accumulation and AMPK activation both in cells and in vivo, establishing a direct metabolic link from ATIC catalytic flux to AMPK-dependent energy sensing.\",\n      \"evidence\": \"Small-molecule ATIC homodimerization inhibitor with ZMP and AMPK measurements in cells and a mouse metabolic disorder model\",\n      \"pmids\": [\"26144885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Inhibitor selectivity not fully profiled; off-target effects possible\", \"Whether ZMP-AMPK axis fully accounts for downstream effects not delineated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple studies converged on ATIC's role in cancer cell proliferation: ATIC knockdown suppresses AMPK and activates mTOR-S6K1 in hepatocellular carcinoma, while ATIC depletion depletes ATP and sensitizes cancer cells to ionizing radiation by impairing DNA repair, and cooperative XMP binding between IMPCHase active sites was revealed by ITC.\",\n      \"evidence\": \"Lentiviral/siRNA knockdown with Compound C rescue in HCC cells; siRNA plus small-molecule inhibitors with ATP rescue and γH2AX/comet assays in cancer cells; ITC with site-directed mutants\",\n      \"pmids\": [\"29246230\", \"29029884\", \"29042184\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direction of ATIC–AMPK relationship appears opposite between studies (KD suppresses AMPK in HCC vs. KD increases AMPK in inhibitor study)—context dependence unresolved\", \"No structural basis for XMP cooperativity\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Genetic knockout of Atic in vascular smooth muscle cells in mice demonstrated that ATIC-dependent purine synthesis is required for VSMC proliferation and arterial neointima formation, translating the enzyme's metabolic role to cardiovascular disease.\",\n      \"evidence\": \"Global and VSMC-specific Atic knockout mice with arterial injury models and LC-MS/MS metabolomics\",\n      \"pmids\": [\"36073366\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AMPK activation or purine depletion is the dominant anti-proliferative mechanism in VSMCs not separated\", \"No pharmacological validation in vascular disease models\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The ATIC substrate precursor AICAr was shown to suppress LRRK2 expression via AUF1-mediated mRNA decay, rescuing dopaminergic neurodegeneration in PD models—extending ATIC's metabolic influence to neurodegeneration through metabolite-driven gene regulation.\",\n      \"evidence\": \"RNA immunoprecipitation, mRNA decay assays, Drosophila and mouse PD models\",\n      \"pmids\": [\"37366237\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ATIC itself was not directly manipulated; effect attributed to its substrate AICAR/AICAr\", \"Cell-type specificity of LRRK2 regulation not fully defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"ATIC deletion in zebrafish and knockdown in myoblasts revealed that AICAR accumulation from ATIC loss causes mitochondrial respiratory chain dysfunction and skeletal muscle atrophy via ubiquitin-proteasome activation, establishing a purine-mitochondria-proteostasis axis.\",\n      \"evidence\": \"CRISPR/Cas9 zebrafish knockout, siRNA in C2C12 cells, metabolomics, mitochondrial function assays, transcriptomics\",\n      \"pmids\": [\"40623538\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AICAR directly damages mitochondria or acts through AMPK hyperactivation not resolved\", \"Single lab; no rescue with exogenous purines reported\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for ATIC's role in purinosome assembly; whether the apparently contradictory directions of AMPK modulation upon ATIC loss reflect tissue-specific contexts or methodological differences; whether the RNA-binding/splicing function is conserved in mammals and its relationship to enzymatic activity; and the precise mechanism linking ATIC to PI3K/AKT signaling independent of AMPK.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of ATIC within a purinosome\", \"AMPK activation vs. suppression upon ATIC loss not reconciled across tissues\", \"Mammalian splicing regulatory role not confirmed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"GO:0016853\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 4, 7, 12, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8, 9]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 2, 9, 13]}\n    ],\n    \"complexes\": [\n      \"purinosome\",\n      \"ATIC homodimer\"\n    ],\n    \"partners\": [\n      \"ALK\",\n      \"GRB2\",\n      \"SHC1\",\n      \"INSR\",\n      \"ZFAS1\",\n      \"AUF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}