{"gene":"ADCY8","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1994,"finding":"ADCY8 (type VIII adenylyl cyclase) was cloned from rat brain and characterized as a 1248-amino acid, dual-transmembrane-span protein that is stimulated up to 40-fold by Ca²⁺/calmodulin (EC50 ~53 nM calmodulin) and shows synergistic activation by Gαs. It is expressed most abundantly in dentate gyrus granule cells, hippocampal CA1–CA3 pyramidal cells, entorhinal and piriform cortices, and produces a novel 165-kDa glycoprotein in heterologous cells.","method":"cDNA cloning, stable expression in HEK293 cells, adenylyl cyclase activity assays, in situ hybridization, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — original cloning with reconstitution of enzymatic activity and calmodulin stimulation, foundational paper","pmids":["8163524"],"is_preprint":false},{"year":1999,"finding":"Two calmodulin-binding sites were identified in ADCY8: an N-terminal Ca²⁺-dependent site (typical amphipathic helix motif) and a C-terminal IQ-like site. Mutagenesis showed the C-terminal site is primarily responsible for Ca²⁺/calmodulin stimulation, and its removal produces a hyperactivated, Ca²⁺-insensitive enzyme, suggesting Ca²⁺/calmodulin activates ADCY8 via a disinhibitory mechanism.","method":"Overlay assays, site-directed mutagenesis, synthetic peptide studies, functional adenylyl cyclase activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis plus in vitro activity assays with multiple orthogonal methods identifying CaM binding sites","pmids":["10075700"],"is_preprint":false},{"year":2002,"finding":"Cardiac-specific transgenic expression of human ADCY8 in mice increased left ventricular systolic pressure ~2-fold, accelerated heart rate by 40%, increased Ca²⁺ transients by 30%, and accelerated relaxation, without altering L-type Ca²⁺ current amplitude. This demonstrated that ADCY8-generated cAMP specifically activates sarcoplasmic reticulum Ca²⁺ uptake but not sarcolemmal Ca²⁺ influx, revealing strong compartmentation of the cAMP signal.","method":"Transgenic mouse model, Langendorff heart perfusion, patch-clamp electrophysiology, fluorescent Ca²⁺ imaging (fluo-3 AM), isolated cardiomyocyte contractility measurements","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — clean genetic model with multiple orthogonal functional readouts","pmids":["12206999"],"is_preprint":false},{"year":2003,"finding":"Cardiac ADCY8 overexpression in transgenic mice upregulated cAMP-phosphodiesterase (PDE) activity, specifically increasing PDE4 and PDE1 hydrolytic activity toward cAMP, while decreasing PDE1/PDE2 activity toward cGMP. This PDE isoform rearrangement created cAMP compartmentation that shielded L-type Ca²⁺ channels from elevated cAMP and protected cardiomyocytes from Ca²⁺ overload. Muscarinic agonist carbachol inhibited contractility in AC8TG but not NTG mice.","method":"Transgenic mouse model, PDE activity assays, pharmacological stimulation (isoprenaline, IBMX, carbachol), patch-clamp electrophysiology","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — multiple PDE biochemical assays combined with functional cardiac physiology in genetic model","pmids":["12890691"],"is_preprint":false},{"year":2005,"finding":"The N-terminus of ADCY8 directly interacts with the catalytic subunit of protein phosphatase 2A (PP2A_C) and the scaffolding subunit PP2A_A (forming a PP2A core dimer complex). PP2A_C pulled down from HEK293 and mouse forebrain membranes was catalytically active. Ca²⁺/calmodulin binding to the ADCY8 N-terminus antagonized PP2A_C association, revealing competitive regulation. Both PP2A_C and ADCY8 co-localize in lipid rafts.","method":"Yeast two-hybrid screen, GST pulldown with affinity precipitation, enzymatic PP2A activity assays, lipid raft fractionation","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1–2 — yeast two-hybrid validated by GST pulldown with catalytic activity confirmation and lipid raft co-fractionation","pmids":["16258073"],"is_preprint":false},{"year":2005,"finding":"ADCY8 expression in mouse brain begins embryonically (E12), initially restricted to epithalamus, hypothalamus, superior colliculus, and spinal cord. Expression broadens and increases postnatally, particularly in thalamus and cerebral cortex, with a transient peak in somatosensory cortex layer IV. This complementary pattern to AC1 (which is more broadly expressed embryonically) implies distinct developmental roles in Ca²⁺/activity-modulated cAMP signaling.","method":"In situ hybridization across embryonic and postnatal mouse brain stages","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 — systematic in situ hybridization mapping across developmental time points, single method","pmids":["15844169"],"is_preprint":false},{"year":2008,"finding":"AC8 (but not AC1) plays a critical role in recovery of synaptic function after depolarization-induced presynaptic silencing. In neurons from AC1/AC8 double-knockout mice, recovery from adaptive silencing was strongly inhibited; this phenotype was fully reproduced in AC8-deficient but not AC1-deficient cells, demonstrating a specific, non-redundant role for ADCY8 in resetting the balance of active versus silent synapses after strong activity.","method":"Genetic knockout mice (AC1-/-, AC8-/-, double KO), presynaptic silencing assay, cAMP pathway pharmacology (forskolin), synaptic activity measurement","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with single and double knockouts cleanly dissecting AC8-specific role","pmids":["18480272"],"is_preprint":false},{"year":2008,"finding":"AC1 and AC8, despite both being Ca²⁺/calmodulin-stimulated, show distinct regulatory mechanisms: AC8 is more dependent on capacitative Ca²⁺ entry (CCE) than AC1. Real-time FRET-based cAMP imaging showed that the two ACs respond differently to dynamic Ca²⁺ events, with differences arising from their distinct modes of calmodulin interaction and the differential roles of the N- and C-lobes of calmodulin.","method":"In vivo and in vitro adenylyl cyclase activity assays, FRET-based real-time cAMP imaging, Ca²⁺ entry mode pharmacology, calmodulin lobe mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including FRET imaging and mutagenesis in one study","pmids":["19029295"],"is_preprint":false},{"year":2009,"finding":"Capacitative Ca²⁺ entry (CCE) mediated specifically by Orai1 and STIM1 (but not TRPC channels or arachidonate-activated channels) robustly activates ADCY8. ADCY8, Orai1, and STIM1 co-localize at the plasma membrane and all three proteins co-distribute in lipid rafts, forming a CCE-cAMP microdomain.","method":"Co-expression of Orai1/STIM1 in HEK293 cells, adenylyl cyclase activity assays, Ca²⁺ entry pharmacology, co-localization imaging, lipid raft fractionation","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches including pharmacological selectivity, colocalization, and raft fractionation","pmids":["19171672"],"is_preprint":false},{"year":2009,"finding":"Adcy8 is differentially expressed in specific brain regions of mouse strains differing in avoidance behavior, and the ADCY8 locus maps to a QTL for avoidance behavior on mouse chromosome 15 syntenic with human 8q24 (linked to bipolar disorder). Chronic carbamazepine (acting via adenylyl cyclase activity) significantly reduced mouse avoidance behavior, providing a functional link between ADCY8 and mood-related behavior.","method":"Chromosome substitution strain QTL mapping, behavioral phenotyping (automated home-cage registration), brain regional expression analysis, pharmacological intervention (carbamazepine infusion)","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2–3 — genetic mapping with expression correlation and pharmacological rescue, but indirect mechanistic link","pmids":["19691954"],"is_preprint":false},{"year":2010,"finding":"AKAP79/150 directly associates with Ca²⁺-stimulable ADCY8 and limits ADCY8 sensitivity to intracellular Ca²⁺ events. This functional interaction was demonstrated in HEK293 cells overexpressing both proteins and confirmed endogenously in pancreatic insulin-secreting cells and hippocampal neurons.","method":"Co-immunoprecipitation, high-resolution live-cell cAMP imaging, endogenous expression validation in pancreatic and neuronal cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with functional consequence measured by live imaging, replicated in endogenous cell systems","pmids":["20410303"],"is_preprint":false},{"year":2010,"finding":"ADCY8 is required cell-autonomously in zebrafish retinal neurons for normal midline crossing. Knockdown of ADCY8 made retinal axons insensitive to the chemokine SDF1 (which normally activates cAMP signaling to antagonize slit-mediated repulsion) and induced ipsilateral misprojections. This established ADCY8 as an essential component of a signaling pathway opposing midline repellent guidance cues before axons reach their targets.","method":"Morpholino knockdown in zebrafish, in vivo retinal axon tracing, genetic epistasis with slit signaling pathway, cell-autonomous rescue experiments","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic knockdown with cell-autonomous rescue establishing specific pathway position","pmids":["20505109"],"is_preprint":false},{"year":2010,"finding":"ADCY8 is central to GLP-1 receptor signaling in pancreatic beta cells. Knockdown of ADCY8 blocked GLP-1-induced cAMP generation, Ca²⁺ signaling, CRE activation, and amplification of exocytosis. Chronic high glucose (glucotoxicity) markedly downregulated ADCY8 expression in INS-1E cells and rat/human islets, and re-expression of ADCY8 (but not GLP-1R) recovered GLP-1 signaling under glucotoxic conditions.","method":"siRNA knockdown, adenoviral re-expression, cAMP measurement, Ca²⁺ imaging, CRE reporter assay, membrane capacitance measurement of exocytosis, transcriptomic analysis, quantitative PCR in rat and human islets","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods with gain- and loss-of-function in multiple cell systems including human islets","pmids":["21046358"],"is_preprint":false},{"year":2012,"finding":"ADCY8 directly binds the N-terminus of Orai1 (the SOC channel pore component) via its own amino terminus. This protein-protein interaction coordinates subcellular changes in both Ca²⁺ and cAMP at the AC8/Orai1 microdomain. High-resolution targeted biosensors showed that the direct interaction is responsible for crosstalk between the two signaling pathways, with Orai1 functioning as an integral component of the signaling complex.","method":"Protein-protein interaction assays (pulldown/co-IP), high-resolution FRET-based biosensors targeted to AC8 and Orai1 microdomains, pharmacological and genetic disruption of interaction","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1–2 — direct interaction identified and validated with high-resolution subcellular biosensors, multiple orthogonal methods","pmids":["22494970"],"is_preprint":false},{"year":2012,"finding":"AKAP79-recruited PKA phosphorylates ADCY8 at Ser-112 within the N-terminus (near the AKAP79 association site), providing a novel negative feedback mechanism. PKA-mediated phosphorylation reduced the on-rate of cAMP production during Ca²⁺ oscillations in wild-type but not non-phosphorylatable (S112A) ADCY8 mutants. This action of PKA was not mediated indirectly through PP2A B56δ subunits.","method":"Site-directed mutagenesis (S112A), FRET-based real-time cAMP imaging during Ca²⁺ oscillations, pharmacological PKA manipulation, co-immunoprecipitation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of specific phosphorylation site validated by real-time imaging, multiple controls","pmids":["22976297"],"is_preprint":false},{"year":2012,"finding":"Interleukin-1β (IL-1β) induces de novo expression of ADCY8 in vascular smooth muscle cells (VSMCs) during trans-differentiation to an inflammatory/migratory phenotype. The Notch pathway (via transcriptional targets Hrt1 and Hrt3) attenuates this IL-1β-mediated ADCY8 upregulation. In a rat carotid balloon-injury model of restenosis, de novo ADCY8 expression coincided with Notch3 pathway downregulation in vivo.","method":"Pharmacological Notch inhibition and activation in VSMCs, overexpression of Hrt1/Hrt3, IL-1β stimulation assays, in vivo rat carotid balloon-injury model with expression analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — genetic overexpression and pharmacological manipulation with in vivo validation, but mechanistic link is transcriptional regulation","pmids":["22613711"],"is_preprint":false},{"year":2019,"finding":"AC8 enriches in lipid raft microdomains via complex N-glycosylation and cytoskeletal association during trafficking to the plasma membrane. Live-cell imaging and biochemical approaches revealed a dynamic interaction between AC8 and caveolin-1 that affects AC8 processing, targeting, and responsiveness. Site-directed mutagenesis and pharmacological approaches showed that N-glycosylation is required for proper lipid raft targeting.","method":"Live-cell imaging, biochemical fractionation, site-directed mutagenesis, pharmacological disruption of cytoskeleton and glycosylation, co-immunoprecipitation with caveolin-1","journal":"The Journal of membrane biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple methods but single-lab study with partial mechanistic follow-up","pmids":["30746562"],"is_preprint":false},{"year":2021,"finding":"AC8 plays a relevant role in breast cancer cells supporting proliferation and migration. Breast cancer cells overexpress AC8, which shifts the AC8-Orai1α stoichiometry in favor of AC8, leading to impairment of PKA-dependent Orai1α inactivation (phosphorylation at serine-34) and enhanced store-operated Ca²⁺ entry (SOCE), thereby contributing to enhanced cancer hallmarks.","method":"AC8 overexpression/knockdown in breast cancer cells, Orai1α phosphorylation assays, SOCE measurement, proliferation and migration assays","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2–3 — mechanistic model with defined molecular targets but relies partly on stoichiometric inference","pmids":["34070268"],"is_preprint":false},{"year":2022,"finding":"Marked cardiac-specific overexpression of ADCY8 (TGAC8 mice) drives sustained increases in heart rate, ejection fraction, and cardiac output without classical hypertrophy. Adaptation involves: increased protein synthesis, proteasome activity, and autophagy; elevated Nrf-2, Hsp90α, and ACC2 protein levels; a metabolic shift from fatty acid oxidation to aerobic glycolysis with increased pentose phosphate shunt activity; and maintenance of normal LV ATP and phosphocreatine levels despite increased energy demand. Omics identified >2,000 transcripts/proteins differing between TGAC8 and WT.","method":"Cardiac-specific transgenic mouse model, unbiased transcriptomics and proteomics, metabolic flux analysis, histology, echocardiography","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — comprehensive multi-omic analysis in well-characterized genetic model with multiple functional readouts","pmids":["36515265"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structure of bovine AC8 bound to stimulatory Gαs and Ca²⁺/calmodulin was determined at 3.5 Å resolution, revealing the architecture of ordered AC8 domains bound to Gαs and forskolin. Limited proteolysis and crosslinking mass spectrometry (LiP-MS and XL-MS) identified contact sites between AC8 and its regulators CaM, Gαs, and Gβγ, and inferred conformational changes induced by these interactions. The captured state does not favor tight nucleotide binding despite well-resolved forskolin density. The extracellular surface features a negatively charged pocket as a potential site for unknown interactors.","method":"Cryo-EM (3.5 Å resolution), limited proteolysis-mass spectrometry (LiP-MS), crosslinking mass spectrometry (XL-MS)","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure combined with structural proteomics identifying regulatory contact sites","pmids":["38351373"],"is_preprint":false},{"year":2024,"finding":"Chronic activation of adenylyl cyclase in TGAC8 cardiomyocytes activates cell-autonomous RelA-mediated NF-κB signaling, driven by calcium/PKA signaling. This leads non-cell-autonomously to activation of proinflammatory signaling in myocardial endothelial and smooth muscle cells, expansion of myocardial immune cells, elevated serum inflammatory cytokines, and changes in lymphoid organs—all preceding cardiac fibrosis. This establishes a calcium/PKA/RelA axis connecting cardiomyocyte ADCY8 activity to myocardial and systemic inflammation.","method":"TGAC8 transgenic mouse model, NF-κB/RelA pathway analysis, PKA inhibition, flow cytometry of immune cells, ELISA for cytokines, cardiac histology","journal":"GeroScience","confidence":"Medium","confidence_rationale":"Tier 2–3 — genetic model with pathway pharmacology establishing mechanistic axis, single lab","pmids":["38499959"],"is_preprint":false},{"year":2025,"finding":"ADCY8 deletion by CRISPR-Cas9 in U87MG glioma cells causes a system-wide remodeling of the mitochondrial proteome, shifting metabolism away from glycolysis (Warburg effect) toward oxidative phosphorylation, as evidenced by increased oxygen consumption, elevated TCA cycle flux, and decreased glycolytic flux. This metabolic shift is driven by absence of AC8-mediated transcriptional regulation.","method":"CRISPR-Cas9 knockout, quantitative proteomics, oxygen consumption rate measurement, metabolic flux analysis (TCA cycle, glycolysis)","journal":"Biochimica et biophysica acta. Bioenergetics","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with proteomics and functional metabolic measurements, single lab","pmids":["40669556"],"is_preprint":false},{"year":2025,"finding":"Adcy8 knockout (Adcy8-/-) mice show more severe lipid accumulation under normal and high-fat diet conditions. ADCY8 regulates lipolysis in adipose tissue via the cAMP-PKA signaling pathway, controlling phosphorylation of lipolytic enzymes. Forskolin enhanced lipolysis and reduced adipocyte size in diet-induced obese wild-type mice but not in Adcy8-/- mice, demonstrating that ADCY8 is required for cAMP-PKA-mediated lipolytic responses in adipose tissue.","method":"Adcy8 knockout mouse model, high-fat diet feeding, adipose tissue histology, cAMP measurement, PKA substrate phosphorylation assays, forskolin stimulation","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with pharmacological rescue experiment defining pathway position","pmids":["40527393"],"is_preprint":false},{"year":2024,"finding":"AC8 mRNA expression is upregulated in NMDAR-2B (Nr2b)-positive neurons in the contralateral anterior cingulate cortex (ACC) of mice after spared nerve injury, while AC1 expression is unchanged, suggesting an unappreciated role for ADCY8 in ACC synaptic plasticity changes associated with neuropathic pain.","method":"RNAscope in situ hybridization in spared nerve injury mouse model, cell-type-specific co-labeling","journal":"Neurobiology of pain","confidence":"Low","confidence_rationale":"Tier 3 — single method (ISH) showing expression change without direct functional mechanism established for ADCY8","pmids":["35005298"],"is_preprint":false},{"year":2024,"finding":"Lysosomal Ca²⁺ signaling (via the NAADP pathway) contributes to α-adrenergic (phenylephrine)-stimulated cAMP production in atrial myocytes through AC1 and AC8. Double knockout of Adcy1 and Adcy8 in mice reduced the positive chronotropic and inotropic response to phenylephrine in atrial tissue, decreased Ca²⁺ transient amplitude, and abolished cytosolic cAMP elevation in neonatal atrial myocytes. This response was atrium-specific (not seen in ventricular myocytes).","method":"Adcy1/Adcy8 double-knockout mouse model, NAADP pathway inhibitors (BZ-194, SAN4825, Bafilomycin A1), cAMP FRET imaging, Ca²⁺ transient measurement, chronotropy/inotropy measurement in atrial tissue","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — genetic double-KO with pharmacological dissection in multiple readouts, but preprint","pmids":["bio_10.1101_2024.11.25.625232"],"is_preprint":true}],"current_model":"ADCY8 (adenylyl cyclase type 8) is a Ca²⁺/calmodulin-stimulated, transmembrane adenylyl cyclase that converts ATP to cAMP selectively in response to capacitative/store-operated Ca²⁺ entry via Orai1 (to which it directly binds at its N-terminus); it is regulated by an AKAP79/150-anchored PKA complex that phosphorylates Ser-112 to provide negative feedback on cAMP production, interacts with PP2A (whose binding to the ADCY8 N-terminus is antagonized by Ca²⁺/calmodulin), and associates with caveolin-1 in lipid raft microdomains; structurally it has been resolved at 3.5 Å by cryo-EM bound to Gαs and Ca²⁺/calmodulin; functionally it is required for GLP-1 receptor signaling in pancreatic beta cells, for recovery from adaptive presynaptic silencing in neurons, for axonal midline crossing in retinal neurons (via SDF1/cAMP antagonism of slit repulsion), for cAMP-PKA-mediated lipolysis in adipose tissue, and in the heart its chronic activation engages a calcium/PKA/RelA-NF-κB inflammatory axis alongside metabolic and proteostatic adaptations."},"narrative":{"teleology":[{"year":1994,"claim":"Cloning of ADCY8 from rat brain established it as a novel Ca²⁺/calmodulin-stimulated adenylyl cyclase with synergistic Gαs activation and predominant hippocampal/cortical expression, defining the founding biochemical identity of the enzyme.","evidence":"cDNA cloning with heterologous expression in HEK293 cells, enzymatic activity assays, in situ hybridization","pmids":["8163524"],"confidence":"High","gaps":["Structural basis of CaM stimulation unknown","In vivo function not addressed","No information on post-translational regulation"]},{"year":1999,"claim":"Identification of two calmodulin-binding sites (N-terminal Ca²⁺-dependent and C-terminal IQ-like) and demonstration that Ca²⁺/calmodulin activates ADCY8 through a disinhibitory mechanism at the C-terminal site resolved the long-standing question of how calcium stimulation is transduced.","evidence":"Overlay assays, site-directed mutagenesis, synthetic peptide studies, and functional activity assays","pmids":["10075700"],"confidence":"High","gaps":["Structural visualization of CaM-AC8 interaction not achieved","Relative contribution of each CaM lobe unresolved","In vivo relevance of disinhibition model untested"]},{"year":2002,"claim":"Cardiac-specific transgenic overexpression revealed that ADCY8-generated cAMP enhances SR Ca²⁺ uptake and contractility without affecting L-type Ca²⁺ channels, establishing that cAMP produced by ADCY8 is functionally compartmentalized in cardiomyocytes.","evidence":"Transgenic mouse model with Langendorff perfusion, patch-clamp, and fluorescent Ca²⁺ imaging","pmids":["12206999"],"confidence":"High","gaps":["Molecular basis of cAMP compartmentation not identified","Role of endogenous cardiac ADCY8 vs overexpression artifacts unclear"]},{"year":2003,"claim":"The discovery that cardiac ADCY8 overexpression selectively remodels PDE isoform activity (upregulating PDE4/PDE1 for cAMP while decreasing PDE1/PDE2 for cGMP) explained the mechanism shielding L-type Ca²⁺ channels from cAMP elevation.","evidence":"PDE activity assays, pharmacological stimulation, and electrophysiology in transgenic mice","pmids":["12890691"],"confidence":"High","gaps":["Whether PDE remodeling is a direct ADCY8 effect or secondary adaptation unknown","Physiological relevance under non-overexpression conditions untested"]},{"year":2005,"claim":"Identification of PP2A as a direct N-terminal binding partner of ADCY8, with Ca²⁺/calmodulin competitively displacing PP2A, revealed a regulatory switch connecting phosphatase and cyclase activities at the same signaling microdomain in lipid rafts.","evidence":"Yeast two-hybrid, GST pulldown, PP2A enzymatic activity assays, lipid raft co-fractionation in HEK293 and mouse forebrain","pmids":["16258073"],"confidence":"High","gaps":["Physiological substrates of ADCY8-associated PP2A unknown","Whether PP2A modulates ADCY8 catalytic activity directly not tested"]},{"year":2008,"claim":"Genetic dissection using single and double knockout mice demonstrated a specific, non-redundant role for ADCY8 (but not AC1) in recovery from depolarization-induced presynaptic silencing, establishing its unique contribution to activity-dependent synaptic resetting.","evidence":"AC1⁻/⁻, AC8⁻/⁻, and double-KO neurons with presynaptic silencing assays and cAMP pharmacology","pmids":["18480272"],"confidence":"High","gaps":["Downstream cAMP targets mediating recovery unidentified","Brain region and circuit specificity of this role not mapped"]},{"year":2008,"claim":"Real-time FRET-based cAMP imaging demonstrated that ADCY8 is preferentially activated by capacitative Ca²⁺ entry over other Ca²⁺ sources, with differential calmodulin N- and C-lobe dependence distinguishing it from AC1, establishing the Ca²⁺ entry mode selectivity concept.","evidence":"FRET cAMP sensors, Ca²⁺ entry mode pharmacology, calmodulin lobe mutagenesis","pmids":["19029295"],"confidence":"High","gaps":["Physical basis for preferential coupling to CCE not yet identified","Whether lobe selectivity applies in native neurons untested"]},{"year":2009,"claim":"The finding that Orai1/STIM1-mediated store-operated Ca²⁺ entry (but not TRPC channels) specifically activates ADCY8, with all three proteins co-distributing in lipid rafts, identified the molecular components of the CCE-cAMP microdomain.","evidence":"Co-expression, adenylyl cyclase assays, Ca²⁺ entry pharmacology, co-localization imaging, and raft fractionation in HEK293 cells","pmids":["19171672"],"confidence":"High","gaps":["Direct protein-protein interaction between AC8 and Orai1 not yet demonstrated","Native tissue validation limited"]},{"year":2010,"claim":"Three advances established ADCY8's non-redundant physiological roles: AKAP79/150 was shown to scaffold AC8 and limit its Ca²⁺ sensitivity in pancreatic beta cells and neurons; ADCY8 knockdown blocked GLP-1-mediated cAMP, Ca²⁺ signaling, and insulin exocytosis (with glucotoxicity downregulating ADCY8 as a disease-relevant mechanism); and morpholino knockdown in zebrafish proved ADCY8 is required cell-autonomously for SDF1/cAMP-mediated retinal axon midline crossing.","evidence":"Co-IP and live-cell cAMP imaging with endogenous validation (AKAP79); siRNA/adenoviral rescue in INS-1E cells, rat and human islets (GLP-1); morpholino knockdown with cell-autonomous rescue in zebrafish (axon guidance)","pmids":["20410303","21046358","20505109"],"confidence":"High","gaps":["AKAP79 binding site on AC8 not mapped","Which AC8 domains mediate GLP-1R coupling unknown","Mammalian validation of axon guidance role lacking"]},{"year":2012,"claim":"Demonstration that the ADCY8 N-terminus directly binds Orai1's N-terminus, coordinating local Ca²⁺ and cAMP signals, and that AKAP79-recruited PKA phosphorylates Ser-112 as a negative feedback mechanism, completed the core regulatory circuit of the AC8 signaling microdomain.","evidence":"Pulldown/co-IP, FRET biosensors targeted to AC8/Orai1 microdomains (Orai1 binding); S112A mutagenesis with real-time cAMP imaging during Ca²⁺ oscillations (PKA feedback)","pmids":["22494970","22976297"],"confidence":"High","gaps":["Structural basis of AC8-Orai1 interaction unresolved","Additional phosphorylation sites on AC8 not surveyed","Whether Ser-112 phosphorylation occurs in vivo not shown"]},{"year":2019,"claim":"The role of complex N-glycosylation and cytoskeletal association in targeting ADCY8 to caveolin-1-containing lipid rafts explained how ADCY8 achieves its specific plasma membrane microdomain localization required for signaling fidelity.","evidence":"Live-cell imaging, biochemical fractionation, mutagenesis of glycosylation sites, caveolin-1 co-IP","pmids":["30746562"],"confidence":"Medium","gaps":["Specific glycosylation sites critical for raft targeting not fully mapped","Single-lab study without independent replication","In vivo consequences of mislocalization untested"]},{"year":2022,"claim":"Comprehensive multi-omic profiling of cardiac ADCY8-overexpressing mice revealed system-level metabolic adaptation — a shift from fatty acid oxidation to aerobic glycolysis with enhanced pentose phosphate shunt activity, upregulated proteasome/autophagy, and maintained ATP homeostasis — explaining how the heart tolerates chronic cAMP elevation without hypertrophy.","evidence":"Transgenic TGAC8 mouse model with transcriptomics, proteomics, metabolic flux analysis, echocardiography","pmids":["36515265"],"confidence":"High","gaps":["Causal hierarchy among metabolic adaptations not established","Whether adaptations are reversible upon ADCY8 normalization unknown"]},{"year":2024,"claim":"The 3.5 Å cryo-EM structure of AC8 bound to Gαs and Ca²⁺/calmodulin provided the first high-resolution view of a Ca²⁺-stimulated adenylyl cyclase, revealing ordered domain architecture, Gαs and CaM contact sites, and a negatively charged extracellular pocket of unknown function, while the captured state unexpectedly disfavored tight nucleotide binding.","evidence":"Cryo-EM at 3.5 Å, LiP-MS, and crosslinking mass spectrometry of bovine AC8","pmids":["38351373"],"confidence":"High","gaps":["Active catalytic conformation with bound substrate not captured","CaM-induced conformational changes not fully resolved","Functional significance of extracellular pocket unknown"]},{"year":2024,"claim":"Discovery that chronic ADCY8-driven cAMP activates a cell-autonomous calcium/PKA/RelA-NF-κB inflammatory axis in cardiomyocytes, triggering non-cell-autonomous immune cell expansion and systemic inflammation preceding fibrosis, linked AC8 activity to inflammatory pathology.","evidence":"TGAC8 mice with NF-κB/RelA analysis, PKA inhibition, flow cytometry, ELISA, cardiac histology","pmids":["38499959"],"confidence":"Medium","gaps":["Whether endogenous AC8 levels can drive this axis unknown","Single-lab study","Specific PKA substrates upstream of RelA not identified"]},{"year":2025,"claim":"Two studies extended ADCY8's metabolic roles: CRISPR deletion in glioma cells reversed the Warburg effect by shifting metabolism toward oxidative phosphorylation, while Adcy8⁻/⁻ mice showed impaired adipose lipolysis with loss of forskolin-responsive cAMP-PKA signaling, establishing ADCY8 as a required component of lipolytic cAMP generation in vivo.","evidence":"CRISPR-KO in U87MG with proteomics and metabolic flux analysis (glioma); Adcy8⁻/⁻ mice on normal and high-fat diets with cAMP/PKA substrate assays (adipose)","pmids":["40669556","40527393"],"confidence":"Medium","gaps":["Whether AC8's metabolic role in glioma is generalizable across tumor types untested","Adipose tissue phenotype not yet linked to specific AC8-interacting proteins","Both are single-lab findings requiring replication"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of the AC8-Orai1 interaction and how it is regulated, whether Ser-112 phosphorylation feedback operates in vivo, the identity of the extracellular pocket ligand revealed by cryo-EM, and whether endogenous cardiac AC8 levels can drive the NF-κB inflammatory axis observed in overexpression models.","evidence":"","pmids":[],"confidence":"Low","gaps":["No AC8-Orai1 co-structure exists","In vivo Ser-112 phosphorylation not confirmed","Extracellular pocket function unknown","Endogenous cardiac AC8 contribution to inflammation not tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0009975","term_label":"cyclase activity","supporting_discovery_ids":[0,1,7,12,19]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,8,13,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,7,8,10,12,13,14]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[6,11]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[18,21,22]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[20]}],"complexes":["AC8-Orai1-STIM1 store-operated Ca²⁺ entry microdomain","AC8-AKAP79/150-PKA signaling complex","AC8-PP2A core dimer complex"],"partners":["ORAI1","STIM1","AKAP5","PPP2CA","PPP2R1A","GNAS","CALM1","CAV1"],"other_free_text":[]},"mechanistic_narrative":"ADCY8 is a Ca²⁺/calmodulin-stimulated transmembrane adenylyl cyclase that converts ATP to cAMP preferentially in response to store-operated Ca²⁺ entry, functioning as a critical node coupling calcium dynamics to compartmentalized cAMP signaling in neurons, cardiomyocytes, pancreatic beta cells, and adipocytes. Ca²⁺/calmodulin activates ADCY8 through a disinhibitory mechanism at a C-terminal IQ-like motif, while the N-terminus directly binds Orai1 to form a microdomain linking store-operated Ca²⁺ entry to cAMP production, and also recruits PP2A in a Ca²⁺/calmodulin-competitive manner; an AKAP79/150-anchored PKA complex phosphorylates Ser-112 to provide negative feedback on cAMP output [PMID:10075700, PMID:22494970, PMID:16258073, PMID:22976297]. ADCY8 is required for GLP-1 receptor-mediated cAMP generation and insulin secretion in beta cells, for recovery from presynaptic silencing in hippocampal neurons, for SDF1/cAMP-dependent retinal axon midline crossing, and for cAMP-PKA-mediated lipolysis in adipose tissue [PMID:21046358, PMID:18480272, PMID:20505109, PMID:40527393]. The 3.5 Å cryo-EM structure of AC8 bound to Gαs and Ca²⁺/calmodulin reveals the ordered domain architecture and regulatory contact sites, while chronic cardiac overexpression engages metabolic reprogramming and a calcium/PKA/RelA-NF-κB inflammatory axis [PMID:38351373, PMID:36515265, PMID:38499959]."},"prefetch_data":{"uniprot":{"accession":"P40145","full_name":"Adenylate cyclase type 8","aliases":["ATP pyrophosphate-lyase 8","Adenylate cyclase type VIII","Adenylyl cyclase 8","AC8","Ca(2+)/calmodulin-activated adenylyl cyclase"],"length_aa":1251,"mass_kda":140.1,"function":"Catalyzes the formation of cAMP in response to calcium entry leadings to cAMP signaling activation that affect processes suche as synaptic plasticity and insulin secretion. Plays a role in many brain functions, such as learning, memory, drug addiction, and anxiety modulation through regulation of synaptic plasticity by modulating long-term memory and long-term potentiation (LTP) through CREB transcription factor activity modulation. Plays a central role in insulin secretion by controlling glucose homeostasis through glucagon-like peptide 1 and glucose signaling pathway and maintains insulin secretion through calcium-dependent PKA activation leading to vesicle pool replenishment. Also, allows PTGER3 to induce potentiation of PTGER4-mediated PLA2 secretion by switching from a negative to a positive regulation, during the IL1B induced-dedifferentiation of smooth muscle cells","subcellular_location":"Cell membrane; Basolateral cell membrane; Apical cell membrane; Synapse; Cell projection, dendrite; Cell projection, axon; Presynaptic cell membrane; Postsynaptic density; Membrane raft; Membrane, coated pit; Cytoplasmic vesicle, clathrin-coated vesicle membrane; Membrane, caveola","url":"https://www.uniprot.org/uniprotkb/P40145/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADCY8","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ADCY8","total_profiled":1310},"omim":[{"mim_id":"602123","title":"CALCIUM/CALMODULIN-DEPENDENT PROTEIN KINASE II-GAMMA; CAMK2G","url":"https://www.omim.org/entry/602123"},{"mim_id":"601115","title":"GLUTAMATE RECEPTOR, METABOTROPIC, 3; GRM3","url":"https://www.omim.org/entry/601115"},{"mim_id":"600163","title":"SODIUM VOLTAGE-GATED CHANNEL, ALPHA SUBUNIT 5; SCN5A","url":"https://www.omim.org/entry/600163"},{"mim_id":"176960","title":"PROTEIN KINASE C, ALPHA; PRKCA","url":"https://www.omim.org/entry/176960"},{"mim_id":"176893","title":"PROTEIN KINASE, cAMP-DEPENDENT, CATALYTIC, GAMMA; PRKACG","url":"https://www.omim.org/entry/176893"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":8.0},{"tissue":"epididymis","ntpm":21.5}],"url":"https://www.proteinatlas.org/search/ADCY8"},"hgnc":{"alias_symbol":["HBAC1","AC8"],"prev_symbol":["ADCY3"]},"alphafold":{"accession":"P40145","domains":[{"cath_id":"-","chopping":"163-358_709-808_827-888_903-935","consensus_level":"medium","plddt":85.276,"start":163,"end":935},{"cath_id":"3.30.70.1230","chopping":"406-596","consensus_level":"medium","plddt":87.0935,"start":406,"end":596},{"cath_id":"3.30.70.1230","chopping":"968-1181_1189-1208","consensus_level":"medium","plddt":81.4919,"start":968,"end":1208}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P40145","model_url":"https://alphafold.ebi.ac.uk/files/AF-P40145-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P40145-F1-predicted_aligned_error_v6.png","plddt_mean":71.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADCY8","jax_strain_url":"https://www.jax.org/strain/search?query=ADCY8"},"sequence":{"accession":"P40145","fasta_url":"https://rest.uniprot.org/uniprotkb/P40145.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P40145/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P40145"}},"corpus_meta":[{"pmid":"29311635","id":"PMC_29311635","title":"Subcellular localization of MC4R with ADCY3 at neuronal primary cilia underlies a common pathway for genetic predisposition to obesity.","date":"2018","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29311635","citation_count":202,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"29311636","id":"PMC_29311636","title":"Loss-of-function variants in ADCY3 increase risk of obesity and type 2 diabetes.","date":"2018","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29311636","citation_count":146,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"29311637","id":"PMC_29311637","title":"Loss-of-function mutations in ADCY3 cause monogenic severe obesity.","date":"2018","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29311637","citation_count":135,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22494970","id":"PMC_22494970","title":"Direct binding between Orai1 and AC8 mediates dynamic interplay between Ca2+ and cAMP signaling.","date":"2012","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/22494970","citation_count":110,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25044758","id":"PMC_25044758","title":"Genome-wide association study of height-adjusted BMI in childhood identifies functional variant in ADCY3.","date":"2014","source":"Obesity (Silver Spring, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/25044758","citation_count":81,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"20410303","id":"PMC_20410303","title":"AKAP79/150 interacts with AC8 and regulates Ca2+-dependent cAMP synthesis in pancreatic and neuronal systems.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20410303","citation_count":66,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12890691","id":"PMC_12890691","title":"Cyclic AMP compartmentation due to increased cAMP-phosphodiesterase activity in transgenic mice with a cardiac-directed expression of the human adenylyl cyclase type 8 (AC8).","date":"2003","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/12890691","citation_count":58,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"29522173","id":"PMC_29522173","title":"Loss of cardiac Wnt/β-catenin signalling in desmoplakin-deficient AC8 zebrafish models is rescuable by genetic and pharmacological intervention.","date":"2018","source":"Cardiovascular research","url":"https://pubmed.ncbi.nlm.nih.gov/29522173","citation_count":46,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19691954","id":"PMC_19691954","title":"Interspecies trait genetics reveals association of Adcy8 with mouse avoidance behavior and a human mood disorder.","date":"2009","source":"Biological psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/19691954","citation_count":46,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24113161","id":"PMC_24113161","title":"Upregulation of adenylate cyclase 3 (ADCY3) increases the tumorigenic potential of cells by activating the CREB pathway.","date":"2013","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/24113161","citation_count":44,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16258073","id":"PMC_16258073","title":"A direct interaction between the N terminus of adenylyl cyclase AC8 and the catalytic subunit of protein phosphatase 2A.","date":"2005","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/16258073","citation_count":38,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12206999","id":"PMC_12206999","title":"Augmentation of cardiac contractility with no change in L-type Ca2+ current in transgenic mice with a cardiac-directed expression of the human adenylyl cyclase type 8 (AC8).","date":"2002","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/12206999","citation_count":37,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15844169","id":"PMC_15844169","title":"Spatiotemporal localization of the calcium-stimulated adenylate cyclases, AC1 and AC8, during mouse brain development.","date":"2005","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/15844169","citation_count":35,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"20505109","id":"PMC_20505109","title":"The calmodulin-stimulated adenylate cyclase ADCY8 sets the sensitivity of zebrafish retinal axons to midline repellents and is required for normal midline crossing.","date":"2010","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/20505109","citation_count":29,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22976297","id":"PMC_22976297","title":"A key phosphorylation site in AC8 mediates regulation of Ca(2+)-dependent cAMP dynamics by an AC8-AKAP79-PKA signalling complex.","date":"2012","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/22976297","citation_count":29,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23702564","id":"PMC_23702564","title":"1H NMR-based metabolomics studies of urine reveal differences between type 1 diabetic patients with high and low HbAc1 values.","date":"2013","source":"Journal of pharmaceutical and biomedical analysis","url":"https://pubmed.ncbi.nlm.nih.gov/23702564","citation_count":27,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"29921800","id":"PMC_29921800","title":"Interaction between an ADCY3 Genetic Variant and Two Weight-Lowering Diets Affecting Body Fatness and Body Composition Outcomes Depending on Macronutrient Distribution: A Randomized Trial.","date":"2018","source":"Nutrients","url":"https://pubmed.ncbi.nlm.nih.gov/29921800","citation_count":26,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"27651839","id":"PMC_27651839","title":"Molecular Pap smear: HPV genotype and DNA methylation of ADCY8, CDH8, and ZNF582 as an integrated biomarker for high-grade cervical cytology.","date":"2016","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/27651839","citation_count":26,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"31433213","id":"PMC_31433213","title":"LINC00319 acts as a microRNA-335-5p sponge to accelerate tumor growth and metastasis in gastric cancer by upregulating ADCY3.","date":"2019","source":"American journal of physiology. Gastrointestinal and liver physiology","url":"https://pubmed.ncbi.nlm.nih.gov/31433213","citation_count":20,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22613711","id":"PMC_22613711","title":"The Notch pathway attenuates interleukin 1β (IL1β)-mediated induction of adenylyl cyclase 8 (AC8) expression during vascular smooth muscle cell (VSMC) trans-differentiation.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22613711","citation_count":20,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"36515265","id":"PMC_36515265","title":"A remarkable adaptive paradigm of heart performance and protection emerges in response to marked cardiac-specific overexpression of ADCY8.","date":"2022","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/36515265","citation_count":19,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34821371","id":"PMC_34821371","title":"Molecular modelling of novel ADCY3 variant predicts a molecular target for tackling obesity.","date":"2021","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34821371","citation_count":16,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"38351373","id":"PMC_38351373","title":"Regulatory sites of CaM-sensitive adenylyl cyclase AC8 revealed by cryo-EM and structural proteomics.","date":"2024","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/38351373","citation_count":13,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"38334651","id":"PMC_38334651","title":"Postnatal Dynamic Ciliary ARL13B and ADCY3 Localization in the Mouse Brain.","date":"2024","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/38334651","citation_count":11,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35005298","id":"PMC_35005298","title":"Evaluation of calcium-sensitive adenylyl cyclase AC1 and AC8 mRNA expression in the anterior cingulate cortex of mice with spared nerve injury neuropathy.","date":"2021","source":"Neurobiology of pain (Cambridge, Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/35005298","citation_count":9,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33178175","id":"PMC_33178175","title":"Molecular Pap Smear: Validation of HPV Genotype and Host Methylation Profiles of ADCY8, CDH8, and ZNF582 as a Predictor of Cervical Cytopathology.","date":"2020","source":"Frontiers in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33178175","citation_count":8,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30746562","id":"PMC_30746562","title":"Structural and Functional Determinants of AC8 Trafficking, Targeting and Responsiveness in Lipid Raft Microdomains.","date":"2019","source":"The Journal of membrane biology","url":"https://pubmed.ncbi.nlm.nih.gov/30746562","citation_count":7,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"38841200","id":"PMC_38841200","title":"ADCY3: the pivotal gene in classical ketogenic diet for the treatment of epilepsy.","date":"2024","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/38841200","citation_count":6,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34070268","id":"PMC_34070268","title":"The Orai1-AC8 Interplay: How Breast Cancer Cells Escape from Orai1 Channel Inactivation.","date":"2021","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/34070268","citation_count":5,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25055061","id":"PMC_25055061","title":"Evaluation of biocompatibility of the AC8 peptide and its potential use as a drug carrier.","date":"2014","source":"Molecular pharmaceutics","url":"https://pubmed.ncbi.nlm.nih.gov/25055061","citation_count":5,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"38499959","id":"PMC_38499959","title":"RelA-mediated signaling connects adaptation to chronic cardiomyocyte stress with myocardial and systemic inflammation in the ADCY8 model of accelerated aging.","date":"2024","source":"GeroScience","url":"https://pubmed.ncbi.nlm.nih.gov/38499959","citation_count":5,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"36384395","id":"PMC_36384395","title":"Polymorphism in ovine ADCY8 gene and its association with residual feed intake in Hu sheep.","date":"2022","source":"Animal biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/36384395","citation_count":4,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34481002","id":"PMC_34481002","title":"ALDH2, ADCY3 and BCMO1 polymorphisms and lifestyle-induced traits are jointly associated with CAD risk in Chinese Han people.","date":"2021","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/34481002","citation_count":4,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"37855273","id":"PMC_37855273","title":"A Rare Case of Monogenic Obesity Due to a Novel Variant in the ADCY3 Gene: Challenges in Follow-up and Treatment.","date":"2023","source":"Journal of clinical research in pediatric endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/37855273","citation_count":3,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39707785","id":"PMC_39707785","title":"Network-based meta-analysis and confirmation of genes ATP1A2, FXYD1, and ADCY3 associated with cAMP signaling in breast tumors compared to corresponding normal marginal tissues.","date":"2024","source":"Cellular and molecular biology (Noisy-le-Grand, France)","url":"https://pubmed.ncbi.nlm.nih.gov/39707785","citation_count":2,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22305930","id":"PMC_22305930","title":"The AC8 IgG3 monoclonal anti-cholesterol antibody modulates uptake and presentation of antigens for T cell activation.","date":"2012","source":"Immunology letters","url":"https://pubmed.ncbi.nlm.nih.gov/22305930","citation_count":2,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39519366","id":"PMC_39519366","title":"Functional Evaluation of a Novel Homozygous ADCY3 Variant Causing Childhood Obesity.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39519366","citation_count":2,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39632398","id":"PMC_39632398","title":"Protein-coding mutation in Adcy3 increases adiposity and alters emotional behaviors sex-dependently in rats.","date":"2024","source":"Obesity (Silver Spring, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/39632398","citation_count":2,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"40527393","id":"PMC_40527393","title":"Adcy8 deficiency contributes to impaired lipolysis and an increased prevalence of obesity in mice.","date":"2025","source":"Biochimica et biophysica acta. Molecular and cell biology of lipids","url":"https://pubmed.ncbi.nlm.nih.gov/40527393","citation_count":1,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"41350952","id":"PMC_41350952","title":"Transcriptome analysis reveals reduced lipid accumulation and mitochondrial metabolic remodeling in ADCY3-overexpressing adipocytes.","date":"2025","source":"Functional & integrative genomics","url":"https://pubmed.ncbi.nlm.nih.gov/41350952","citation_count":1,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"38916175","id":"PMC_38916175","title":"Protein-coding mutation in Adcy3 increases adiposity and alters emotional behaviors sex-dependently in rats.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38916175","citation_count":1,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"37368776","id":"PMC_37368776","title":"A Study of 41 Canine Orthologues of Human Genes Involved in Monogenic Obesity Reveals Marker in the ADCY3 for Body Weight in Labrador Retrievers.","date":"2023","source":"Veterinary sciences","url":"https://pubmed.ncbi.nlm.nih.gov/37368776","citation_count":1,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39780573","id":"PMC_39780573","title":"[Association between ADCY3 gene polymorphism and the effects of high-intensity interval training on body composition].","date":"2024","source":"Sheng li xue bao : [Acta physiologica Sinica]","url":"https://pubmed.ncbi.nlm.nih.gov/39780573","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"41494241","id":"PMC_41494241","title":"The rs713586 risk variant dysregulates ADCY3 rather than DNAJC27, leading to obesity through ZFP42-TET1-mediated DNA methylation.","date":"2026","source":"EBioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/41494241","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"41630919","id":"PMC_41630919","title":"Circadian ADCY3 Ser107Pro variant bridges difficulty awakening in the morning and adiposity.","date":"2025","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/41630919","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"41542040","id":"PMC_41542040","title":"An Adcy3 coding mutation causes partial loss of enzymatic function, contributing to obesity in a rat model by reducing lipolysis.","date":"2026","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/41542040","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"40669556","id":"PMC_40669556","title":"Deletion of AC8 in glioma cells elevates oxidative phosphorylation by system-wide remodeling of the mitochondrial proteome.","date":"2025","source":"Biochimica et biophysica acta. Bioenergetics","url":"https://pubmed.ncbi.nlm.nih.gov/40669556","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39060963","id":"PMC_39060963","title":"The association between dietary, physical activity and the DNA methylation of PPARGC1A, HLA-DQA1 and ADCY3 in pregnant women with gestational diabetes mellitus: a nest case-control study.","date":"2024","source":"BMC pregnancy and childbirth","url":"https://pubmed.ncbi.nlm.nih.gov/39060963","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"41245346","id":"PMC_41245346","title":"Meta-analysis of GLP1R, GIPR, ADCY3, and CREB1 expression in osteoarthritis identifies CREB1 as a potential biomarker and therapeutic target.","date":"2025","source":"Journal of clinical orthopaedics and trauma","url":"https://pubmed.ncbi.nlm.nih.gov/41245346","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"40766578","id":"PMC_40766578","title":"ADCY3 Ser107Pro links difficulty awakening in the morning to adiposity through circadian regulation of adipose thermogenesis.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40766578","citation_count":0,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":null,"id":"bio_10.1101_2024.11.25.625232","title":"Lysosomal calcium signalling contributes to the acute α-adrenergic response via calcium-stimulated adenylyl cyclase 1 and 8","date":"2024-11-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.25.625232","citation_count":0,"is_preprint":true,"source_track":"pubmed_title"},{"pmid":null,"id":"bio_10.1101_2025.07.28.667339","title":"<i>ADCY3</i> Ser107Pro links difficulty awakening in the morning to adiposity through circadian regulation of adipose thermogenesis","date":"2025-07-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.28.667339","citation_count":0,"is_preprint":true,"source_track":"pubmed_title"},{"pmid":null,"id":"bio_10.1101_2025.03.28.645767","title":"A mutation in the transmembrane domain of <i>Adenylate cyclase 3</i> impairs enzymatic function to cause sex-specific depression- and anxiety-like behaviors and food seeking in a rat model","date":"2025-04-02","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.28.645767","citation_count":0,"is_preprint":true,"source_track":"pubmed_title"},{"pmid":null,"id":"bio_10.1101_2024.09.24.614747","title":"ADENYLATE CYCLASE 3 MEDIATES CAROTID BODY ACTIVATION AND AUTONOMIC DYSFUNCTION IN A SLEEP APNEA MODEL","date":"2024-09-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.24.614747","citation_count":0,"is_preprint":true,"source_track":"pubmed_title"},{"pmid":null,"id":"bio_10.1101_2024.06.16.598846","title":"Protein-coding mutation in<i>Adcy3</i>increases adiposity and alters emotional behaviors sex-dependently in rats","date":"2024-06-16","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.16.598846","citation_count":0,"is_preprint":true,"source_track":"pubmed_title"},{"pmid":null,"id":"bio_10.1101_2025.05.13.25327505","title":"The role of common and rare genetic variation on adiposity across childhood","date":"2025-05-13","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.13.25327505","citation_count":0,"is_preprint":true,"source_track":"pubmed_title"},{"pmid":"12477932","id":"PMC_12477932","title":"Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/12477932","citation_count":1479,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"2165385","id":"PMC_2165385","title":"cAMP-dependent protein kinase: framework for a diverse family of regulatory enzymes.","date":"1990","source":"Annual review of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/2165385","citation_count":1019,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19490893","id":"PMC_19490893","title":"A genome-wide RNAi screen identifies multiple synthetic lethal interactions with the Ras oncogene.","date":"2009","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/19490893","citation_count":843,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11076863","id":"PMC_11076863","title":"DNA cloning using in vitro site-specific recombination.","date":"2000","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/11076863","citation_count":815,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33961781","id":"PMC_33961781","title":"Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.","date":"2021","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/33961781","citation_count":705,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9417641","id":"PMC_9417641","title":"Crystal structure of the catalytic domains of adenylyl cyclase in a complex with Gsalpha.GTPgammaS.","date":"1997","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/9417641","citation_count":657,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21873635","id":"PMC_21873635","title":"Phylogenetic-based propagation of functional annotations within the Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12626323","id":"PMC_12626323","title":"Glucagon and regulation of glucose metabolism.","date":"2003","source":"American journal of physiology. Endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/12626323","citation_count":635,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17110338","id":"PMC_17110338","title":"Hsp90 cochaperone Aha1 downregulation rescues misfolding of CFTR in cystic fibrosis.","date":"2006","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/17110338","citation_count":517,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14993377","id":"PMC_14993377","title":"Isoforms of mammalian adenylyl cyclase: multiplicities of signaling.","date":"2002","source":"Molecular interventions","url":"https://pubmed.ncbi.nlm.nih.gov/14993377","citation_count":299,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8163524","id":"PMC_8163524","title":"Type VIII adenylyl cyclase. A Ca2+/calmodulin-stimulated enzyme expressed in discrete regions of rat brain.","date":"1994","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8163524","citation_count":278,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21116278","id":"PMC_21116278","title":"Genome-wide association with MRI atrophy measures as a quantitative trait locus for Alzheimer's disease.","date":"2010","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/21116278","citation_count":127,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20379614","id":"PMC_20379614","title":"Personalized smoking cessation: interactions between nicotine dose, dependence and quit-success genotype score.","date":"2010","source":"Molecular medicine (Cambridge, Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/20379614","citation_count":108,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7937899","id":"PMC_7937899","title":"Mechanism of GTP hydrolysis by G-protein alpha subunits.","date":"1994","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/7937899","citation_count":106,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32707033","id":"PMC_32707033","title":"Kinase Interaction Network Expands Functional and Disease Roles of Human Kinases.","date":"2020","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/32707033","citation_count":88,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19156168","id":"PMC_19156168","title":"Pharmacogenetics of antipsychotic response in the CATIE trial: a candidate gene analysis.","date":"2009","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/19156168","citation_count":84,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8663304","id":"PMC_8663304","title":"Purification and characterization of a soluble form of mammalian adenylyl cyclase.","date":"1996","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8663304","citation_count":83,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12503609","id":"PMC_12503609","title":"Characterization of the human adenylyl cyclase gene family: cDNA, gene structure, and tissue distribution of the nine isoforms.","date":"2002","source":"Journal of receptor and signal transduction research","url":"https://pubmed.ncbi.nlm.nih.gov/12503609","citation_count":77,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10075700","id":"PMC_10075700","title":"Calmodulin-binding sites on adenylyl cyclase type VIII.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10075700","citation_count":70,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26480920","id":"PMC_26480920","title":"Genome-wide association studies suggest sex-specific loci associated with abdominal and visceral fat.","date":"2015","source":"International journal of obesity (2005)","url":"https://pubmed.ncbi.nlm.nih.gov/26480920","citation_count":68,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8476432","id":"PMC_8476432","title":"A novel adenylyl cyclase sequence cloned from the human erythroleukemia cell line.","date":"1993","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/8476432","citation_count":68,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21046358","id":"PMC_21046358","title":"Adenylyl cyclase 8 is central to glucagon-like peptide 1 signalling and effects of chronically elevated glucose in rat and human pancreatic beta cells.","date":"2010","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/21046358","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24677629","id":"PMC_24677629","title":"A genome-wide association study of clinical symptoms of dissociation in a trauma-exposed sample.","date":"2014","source":"Depression and anxiety","url":"https://pubmed.ncbi.nlm.nih.gov/24677629","citation_count":58,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19171672","id":"PMC_19171672","title":"Capacitative Ca2+ entry via Orai1 and stromal interacting molecule 1 (STIM1) regulates adenylyl cyclase type 8.","date":"2009","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/19171672","citation_count":57,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11884542","id":"PMC_11884542","title":"Mechanism of human immunodeficiency virus-induced complement expression in astrocytes and neurons.","date":"2002","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/11884542","citation_count":56,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19029295","id":"PMC_19029295","title":"Distinct mechanisms of regulation by Ca2+/calmodulin of type 1 and 8 adenylyl cyclases support their different physiological roles.","date":"2008","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19029295","citation_count":46,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18480272","id":"PMC_18480272","title":"A specific role for Ca2+-dependent adenylyl cyclases in recovery from adaptive presynaptic silencing.","date":"2008","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18480272","citation_count":45,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24709693","id":"PMC_24709693","title":"Genome-wide data reveal novel genes for methotrexate response in a large cohort of juvenile idiopathic arthritis cases.","date":"2014","source":"The pharmacogenomics journal","url":"https://pubmed.ncbi.nlm.nih.gov/24709693","citation_count":42,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10807185","id":"PMC_10807185","title":"HIV-1 envelope protein gp41 modulates expression of interleukin-10 and chemokine receptors on monocytes, astrocytes and neurones.","date":"2000","source":"AIDS (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/10807185","citation_count":40,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23278386","id":"PMC_23278386","title":"Genetic markers of comorbid depression and alcoholism in women.","date":"2012","source":"Alcoholism, clinical and experimental research","url":"https://pubmed.ncbi.nlm.nih.gov/23278386","citation_count":35,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":30508,"output_tokens":4056,"usd":0.076182},"stage2":{"model":"claude-opus-4-6","input_tokens":7527,"output_tokens":2996,"usd":0.168802},"total_usd":0.615669,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":43139,"output_tokens":8166,"usd":0.125953},"round2_rules_fired":"R2","round2_stage2":{"model":"claude-opus-4-6","input_tokens":11136,"output_tokens":4299,"usd":0.244732}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"AC8 directly binds Orai1 (the pore component of store-operated Ca2+ channels) via their amino termini; this protein-protein interaction coordinates subcellular changes in both Ca2+ and cAMP, enabling Ca2+-entry-dependent cAMP synthesis in a highly organized signaling complex.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, high-resolution FRET/BRET biosensors targeted to AC8 and Orai1 microdomains\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct interaction identified by pulldown and confirmed by targeted biosensors measuring functional consequences; moderate evidence from a single rigorous multidisciplinary study\",\n      \"pmids\": [\"22494970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AC8 associates directly with AKAP79/150, and this interaction limits the sensitivity of AC8 to intracellular Ca2+ events; the functional interaction was observed in HEK293 cells and confirmed in endogenous systems (pancreatic insulin-secreting cells and hippocampal neurons).\",\n      \"method\": \"Co-immunoprecipitation, high-resolution live-cell imaging (FRET-based cAMP biosensors)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional live-cell cAMP imaging in multiple cell types including endogenous systems\",\n      \"pmids\": [\"20410303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AKAP79 recruits PKA to AC8 and PKA phosphorylates AC8 at Ser-112 (identified by site-directed mutagenesis), providing negative feedback that reduces the on-rate of cAMP production during Ca2+ oscillations; PP2A B56δ subunits associate with the AC8 N-terminus but this association is not the mechanism of AKAP79-mediated regulation.\",\n      \"method\": \"Site-directed mutagenesis, FRET-based cAMP biosensors, co-immunoprecipitation, live-cell Ca2+ oscillation experiments\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis identifying specific phosphorylation site combined with functional live-cell imaging showing consequence on cAMP dynamics\",\n      \"pmids\": [\"22976297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The N-terminus of AC8 directly binds the catalytic subunit of protein phosphatase 2A (PP2A-C) and the scaffolding subunit PP2A-A; the interaction is antagonized by Ca2+/calmodulin. Both PP2A-C and AC8 co-localize in lipid raft fractions.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown from HEK293 and mouse forebrain membranes (affinity precipitation of catalytically active PP2A-C), lipid raft fractionation\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — yeast two-hybrid discovery confirmed by GST pulldown from native brain tissue; catalytic activity of precipitated PP2A confirmed\",\n      \"pmids\": [\"16258073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structure of bovine AC8 at 3.5 Å resolution bound to stimulatory Gαs and the small-molecule activator forskolin reveals the architecture of ordered AC8 domains, an extracellular negatively charged pocket, and a captured state not favouring tight nucleotide binding. Structural proteomics (LiP-MS and XL-MS) identified contact sites between AC8 and its regulators CaM, Gαs, and Gβγ, and inferred conformational changes induced by these interactions.\",\n      \"method\": \"Cryo-EM, limited proteolysis-mass spectrometry (LiP-MS), crosslinking mass spectrometry (XL-MS)\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — 3.5 Å cryo-EM structure combined with structural proteomics providing mechanistic detail on regulatory interfaces\",\n      \"pmids\": [\"38351373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AC8 is processed with complex N-glycans, associates with caveolin-1 dynamically, and traffics to lipid raft microdomains at the plasma membrane via this interaction; site-directed mutagenesis and pharmacological disruption of cytoskeletal elements affect AC8 processing, targeting, and Ca2+-stimulated responsiveness.\",\n      \"method\": \"Biochemical fractionation, live-cell imaging, site-directed mutagenesis, pharmacological disruption of cytoskeleton/N-glycosylation\",\n      \"journal\": \"The Journal of membrane biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (biochemistry + live imaging + mutagenesis) from a single lab\",\n      \"pmids\": [\"30746562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cardiac-specific transgenic expression of AC8 increases cAMP and selectively activates Ca2+ uptake into the sarcoplasmic reticulum (increasing Ca2+ transients and contractility) without affecting L-type Ca2+ channel current, demonstrating compartmentation of the cAMP signal produced by AC8.\",\n      \"method\": \"Transgenic mouse model, patch-clamp (ICa,L), Ca2+ imaging (fluo-3 AM), Langendorff perfusion, cell shortening measurements\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean transgenic KO/OE model with multiple orthogonal functional readouts (electrophysiology, Ca2+ imaging, organ-level contractility)\",\n      \"pmids\": [\"12206999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cardiac AC8 overexpression leads to compensatory upregulation of cAMP-PDE activity (mainly PDE4 and PDE1), creating strong cAMP compartmentation that shields L-type Ca2+ channels from elevated cAMP and protects cardiomyocytes from Ca2+ overload.\",\n      \"method\": \"Transgenic mouse hearts, PDE activity assays (isoform-specific), pharmacological challenge (IBMX, isoprenaline, carbachol), ICa,L measurements\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic model with biochemical PDE assays and multiple pharmacological challenges confirming compartmentation mechanism\",\n      \"pmids\": [\"12890691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADCY8 (calmodulin-activated adenylyl cyclase) is required cell-autonomously in zebrafish retinal neurons for normal midline crossing; knockdown of ADCY8 makes retinal axons insensitive to SDF1-mediated cAMP signaling that antagonizes slit repellent, revealing ADCY8 as an essential component of the pathway opposing midline repellent signaling.\",\n      \"method\": \"Antisense morpholino knockdown in zebrafish, in vivo retinal axon tracing, epistasis experiments (ADCY8 vs. slit/SDF1 signaling)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function in vivo with defined cellular phenotype (axon misprojection) and pathway placement by epistasis\",\n      \"pmids\": [\"20505109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IL-1β induces de novo expression of AC8 in vascular smooth muscle cells (VSMCs) during trans-differentiation to the inflammatory/migratory phenotype; the Notch pathway (via downstream targets Hrt1 and Hrt3) attenuates this IL-1β-mediated AC8 upregulation, and AC8 de novo expression coincides with downregulation of Notch3 in a rat carotid balloon-injury model.\",\n      \"method\": \"In vitro VSMC transdifferentiation assays, Notch pathway activation/inhibition, Hrt1/Hrt3 overexpression, rat carotid balloon-injury in vivo model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway placement via gain/loss-of-function with defined phenotype, confirmed in vivo; single lab\",\n      \"pmids\": [\"22613711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ADCY8 knockout in U87MG glioma cells (CRISPR-Cas9) causes system-wide remodeling of the mitochondrial proteome, shifting metabolism away from glycolysis toward oxidative phosphorylation (increased O2 consumption, elevated TCA cycle flux, decreased glycolytic flux), suggesting AC8 mediates transcriptional regulation of mitochondrial proteins.\",\n      \"method\": \"CRISPR-Cas9 knockout, proteomics, oxygen consumption measurements, 13C metabolic flux analysis\",\n      \"journal\": \"Biochimica et biophysica acta. Bioenergetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined metabolic phenotype and multiple orthogonal measurements; single lab\",\n      \"pmids\": [\"40669556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Adcy8 knockout mice exhibit impaired lipolysis: reduced cAMP and diminished phosphorylation of lipolytic enzymes in visceral adipose tissue under normal and high-fat diet conditions; forskolin-enhanced lipolysis and adipocyte size reduction observed in wild-type mice is abrogated in Adcy8-/- mice, establishing that adipose AC8 regulates lipolysis via the cAMP-PKA pathway.\",\n      \"method\": \"Adcy8 knockout mice, cAMP assays, phosphorylation analysis of lipolytic enzymes, forskolin treatment, adipocyte size measurements, high-fat diet challenge\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple orthogonal functional readouts and pharmacological rescue; single lab\",\n      \"pmids\": [\"40527393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In cardiac-specific AC8 overexpressing (TGAC8) mice, chronic adenylyl cyclase activation triggers cell-autonomous RelA-mediated NF-κB signaling in cardiomyocytes, which is mediated through a calcium/PKA/RelA axis, leading to non-cell-autonomous inflammatory signaling in myocardial endothelial and smooth muscle cells and systemic inflammation preceding cardiac fibrosis.\",\n      \"method\": \"TGAC8 transgenic mouse model, NF-κB/RelA pathway analysis, PKA inhibitor experiments, cytokine measurements, histology\",\n      \"journal\": \"GeroScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway placement using pharmacological inhibition in transgenic model; single lab\",\n      \"pmids\": [\"38499959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Adcy8 is differentially expressed in specific brain regions of mouse strains that differ in avoidance behavior; chronic carbamazepine (acting via adenylyl cyclase activity) significantly reduces mouse avoidance behavior, linking ADCY8-mediated cAMP signaling to mood-relevant behavioral traits.\",\n      \"method\": \"Chromosome substitution strain QTL mapping, in situ hybridization for Adcy8 regional expression, chronic drug infusion (carbamazepine) with behavioral readout\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — QTL mapping plus expression plus pharmacological intervention; pathway placement moderate; single lab\",\n      \"pmids\": [\"19691954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Lysosomal Ca2+ mobilized via the NAADP pathway contributes to α-adrenergic (phenylephrine)-stimulated cAMP production in atrial myocytes via Ca2+-sensitive AC1 and AC8; double knockout of Adcy1 and Adcy8 in mice reduces the positive chronotropic and inotropic response to phenylephrine, Ca2+ transient amplitude in atrial myocytes, and cAMP levels in neonatal atrial myocytes, but not ventricular myocytes.\",\n      \"method\": \"Double-knockout mouse model (Adcy1/Adcy8), NAADP pathway inhibitors, cAMP biosensors, Ca2+ imaging, atrial/ventricular myocyte isolation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — double-KO model with multiple functional readouts and pharmacological validation; preprint only\",\n      \"pmids\": [\"bio_10.1101_2024.11.25.625232\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"AC8 and AC1 show complementary spatiotemporal expression patterns in mouse brain development: AC8 expression begins at E12 in restricted regions (epithalamus, hypothalamus, superior colliculus, cerebellar anlage, spinal cord) and broadens postnatally, with a transient peak in layer IV of somatosensory cortex, establishing the developmental windows during which AC8-mediated Ca2+-dependent cAMP synthesis may operate.\",\n      \"method\": \"In situ hybridization across embryonic and postnatal mouse brain stages\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — localization study without direct functional consequence demonstrated\",\n      \"pmids\": [\"15844169\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADCY8 (adenylyl cyclase 8) is a Ca2+/calmodulin-stimulated, lipid raft-resident transmembrane enzyme that converts ATP to cAMP in response to capacitative Ca2+ entry; it forms direct protein complexes with Orai1 (store-operated Ca2+ channel), AKAP79/150, and PP2A, allowing PKA-mediated phosphorylation of Ser-112 to provide negative feedback on Ca2+-driven cAMP production, while its cryo-EM structure reveals Gαs- and CaM-regulated conformational states; in vivo, AC8 controls cardiac contractility through compartmented cAMP signaling to the sarcoplasmic reticulum, regulates adipose lipolysis via cAMP-PKA, directs retinal axon midline crossing through SDF1-dependent cAMP antagonism of slit repellent, and mediates inflammatory trans-differentiation of vascular smooth muscle cells downstream of IL-1β and Notch signaling.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nADCY8-relevant papers (KEEP):\n- [4] Direct binding Orai1 and AC8 → KEEP (ADCY8)\n- [6] AKAP79/150 interacts with AC8 → KEEP (ADCY8)\n- [7] Cardiac AC8 transgenic mice → KEEP (ADCY8)\n- [8] AC8 zebrafish model (arrhythmogenic cardiomyopathy AC8 form) → NOTE: \"AC8 form\" refers to arrhythmogenic cardiomyopathy type 8 (linked to DSP), NOT ADCY8 protein → EXCLUDE (alias collision: AC8 = arrhythmogenic cardiomyopathy 8)\n- [9] Adcy8 avoidance behavior → KEEP (ADCY8)\n- [11] PP2A interaction with AC8 N-terminus → KEEP (ADCY8)\n- [12] Cardiac AC8 transgenic mice contractility → KEEP (ADCY8)\n- [13] Spatiotemporal localization AC1 and AC8 → KEEP (ADCY8)\n- [14] ADCY8 zebrafish retinal axons → KEEP (ADCY8)\n- [15] AC8-AKAP79-PKA signalling complex → KEEP (ADCY8)\n- [20] Notch pathway and AC8 in VSMC → KEEP (ADCY8)\n- [21] TGAC8 cardiac overexpression → KEEP (ADCY8)\n- [22] ADCY8 in GLP-1 signalling beta cells → KEEP (ADCY8)\n- [23] Cryo-EM structure of AC8 → KEEP (ADCY8)\n- [24] ADCY3 ciliary localization (ADCY3, not ADCY8) → EXCLUDE\n- [25] AC8 mRNA in ACC neuropathy → KEEP (ADCY8, mentions AC8 role)\n- [27] AC8 trafficking, lipid rafts → KEEP (ADCY8)\n- [29] Orai1-AC8 interplay breast cancer → KEEP (ADCY8)\n- [31] RelA signaling TGAC8 → KEEP (ADCY8)\n- [36] AC8 IgG3 monoclonal antibody → EXCLUDE (this \"AC8\" is an antibody name, not ADCY8 gene)\n- [39] Adcy8 deficiency lipolysis → KEEP (ADCY8)\n- [47] Deletion of AC8 in glioma → KEEP (ADCY8)\n- [51] PREPRINT: AC1 and AC8 lysosomal calcium → KEEP (ADCY8)\n- [30] AC8 peptide drug carrier → EXCLUDE (AC8 is a self-assembling peptide, not ADCY8)\n\nGene2pubmed additional papers:\n- [10] Isoforms mammalian adenylyl cyclase → KEEP (review, mentions AC8)\n- [11g2p] Type VIII adenylyl cyclase characterization → KEEP (ADCY8, foundational)\n- [19g2p] Calmodulin-binding sites AC8 → KEEP (ADCY8)\n- [21g2p] Novel AC sequence from HEL cells → KEEP (ADCY8)\n- [22g2p] ADCY8 GLP-1 signalling → already captured as [22]\n- [24g2p] CCE via Orai1/STIM1 regulates AC8 → KEEP (ADCY8)\n- [26g2p] Distinct mechanisms Ca2+/CaM AC1 and AC8 → KEEP (ADCY8)\n- [27g2p] AC1 and AC8 in presynaptic silencing → KEEP (ADCY8)\n- [6g2p] Crystal structure adenylyl cyclase + Gsα → KEEP (foundational AC mechanism)\n\nPapers about ADCY3 only → EXCLUDE (papers [1],[2],[3],[5],[10],[17],[19],[22],[28],[33],[34],[37],[38],[40],[41],[43],[44],[45],[46],[50],[52],[53],[54],[55],[56] and many others that are purely ADCY3)\n\nPapers clearly off-target (metabolomics, GWAS unrelated, cervical methylation biomarker, etc.) → EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"ADCY8 (type VIII adenylyl cyclase) was cloned from rat brain and characterized as a 1248-amino acid, dual-transmembrane-span protein that is stimulated up to 40-fold by Ca²⁺/calmodulin (EC50 ~53 nM calmodulin) and shows synergistic activation by Gαs. It is expressed most abundantly in dentate gyrus granule cells, hippocampal CA1–CA3 pyramidal cells, entorhinal and piriform cortices, and produces a novel 165-kDa glycoprotein in heterologous cells.\",\n      \"method\": \"cDNA cloning, stable expression in HEK293 cells, adenylyl cyclase activity assays, in situ hybridization, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning with reconstitution of enzymatic activity and calmodulin stimulation, foundational paper\",\n      \"pmids\": [\"8163524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Two calmodulin-binding sites were identified in ADCY8: an N-terminal Ca²⁺-dependent site (typical amphipathic helix motif) and a C-terminal IQ-like site. Mutagenesis showed the C-terminal site is primarily responsible for Ca²⁺/calmodulin stimulation, and its removal produces a hyperactivated, Ca²⁺-insensitive enzyme, suggesting Ca²⁺/calmodulin activates ADCY8 via a disinhibitory mechanism.\",\n      \"method\": \"Overlay assays, site-directed mutagenesis, synthetic peptide studies, functional adenylyl cyclase activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus in vitro activity assays with multiple orthogonal methods identifying CaM binding sites\",\n      \"pmids\": [\"10075700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cardiac-specific transgenic expression of human ADCY8 in mice increased left ventricular systolic pressure ~2-fold, accelerated heart rate by 40%, increased Ca²⁺ transients by 30%, and accelerated relaxation, without altering L-type Ca²⁺ current amplitude. This demonstrated that ADCY8-generated cAMP specifically activates sarcoplasmic reticulum Ca²⁺ uptake but not sarcolemmal Ca²⁺ influx, revealing strong compartmentation of the cAMP signal.\",\n      \"method\": \"Transgenic mouse model, Langendorff heart perfusion, patch-clamp electrophysiology, fluorescent Ca²⁺ imaging (fluo-3 AM), isolated cardiomyocyte contractility measurements\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic model with multiple orthogonal functional readouts\",\n      \"pmids\": [\"12206999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cardiac ADCY8 overexpression in transgenic mice upregulated cAMP-phosphodiesterase (PDE) activity, specifically increasing PDE4 and PDE1 hydrolytic activity toward cAMP, while decreasing PDE1/PDE2 activity toward cGMP. This PDE isoform rearrangement created cAMP compartmentation that shielded L-type Ca²⁺ channels from elevated cAMP and protected cardiomyocytes from Ca²⁺ overload. Muscarinic agonist carbachol inhibited contractility in AC8TG but not NTG mice.\",\n      \"method\": \"Transgenic mouse model, PDE activity assays, pharmacological stimulation (isoprenaline, IBMX, carbachol), patch-clamp electrophysiology\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple PDE biochemical assays combined with functional cardiac physiology in genetic model\",\n      \"pmids\": [\"12890691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The N-terminus of ADCY8 directly interacts with the catalytic subunit of protein phosphatase 2A (PP2A_C) and the scaffolding subunit PP2A_A (forming a PP2A core dimer complex). PP2A_C pulled down from HEK293 and mouse forebrain membranes was catalytically active. Ca²⁺/calmodulin binding to the ADCY8 N-terminus antagonized PP2A_C association, revealing competitive regulation. Both PP2A_C and ADCY8 co-localize in lipid rafts.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown with affinity precipitation, enzymatic PP2A activity assays, lipid raft fractionation\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — yeast two-hybrid validated by GST pulldown with catalytic activity confirmation and lipid raft co-fractionation\",\n      \"pmids\": [\"16258073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ADCY8 expression in mouse brain begins embryonically (E12), initially restricted to epithalamus, hypothalamus, superior colliculus, and spinal cord. Expression broadens and increases postnatally, particularly in thalamus and cerebral cortex, with a transient peak in somatosensory cortex layer IV. This complementary pattern to AC1 (which is more broadly expressed embryonically) implies distinct developmental roles in Ca²⁺/activity-modulated cAMP signaling.\",\n      \"method\": \"In situ hybridization across embryonic and postnatal mouse brain stages\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic in situ hybridization mapping across developmental time points, single method\",\n      \"pmids\": [\"15844169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AC8 (but not AC1) plays a critical role in recovery of synaptic function after depolarization-induced presynaptic silencing. In neurons from AC1/AC8 double-knockout mice, recovery from adaptive silencing was strongly inhibited; this phenotype was fully reproduced in AC8-deficient but not AC1-deficient cells, demonstrating a specific, non-redundant role for ADCY8 in resetting the balance of active versus silent synapses after strong activity.\",\n      \"method\": \"Genetic knockout mice (AC1-/-, AC8-/-, double KO), presynaptic silencing assay, cAMP pathway pharmacology (forskolin), synaptic activity measurement\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with single and double knockouts cleanly dissecting AC8-specific role\",\n      \"pmids\": [\"18480272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AC1 and AC8, despite both being Ca²⁺/calmodulin-stimulated, show distinct regulatory mechanisms: AC8 is more dependent on capacitative Ca²⁺ entry (CCE) than AC1. Real-time FRET-based cAMP imaging showed that the two ACs respond differently to dynamic Ca²⁺ events, with differences arising from their distinct modes of calmodulin interaction and the differential roles of the N- and C-lobes of calmodulin.\",\n      \"method\": \"In vivo and in vitro adenylyl cyclase activity assays, FRET-based real-time cAMP imaging, Ca²⁺ entry mode pharmacology, calmodulin lobe mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including FRET imaging and mutagenesis in one study\",\n      \"pmids\": [\"19029295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Capacitative Ca²⁺ entry (CCE) mediated specifically by Orai1 and STIM1 (but not TRPC channels or arachidonate-activated channels) robustly activates ADCY8. ADCY8, Orai1, and STIM1 co-localize at the plasma membrane and all three proteins co-distribute in lipid rafts, forming a CCE-cAMP microdomain.\",\n      \"method\": \"Co-expression of Orai1/STIM1 in HEK293 cells, adenylyl cyclase activity assays, Ca²⁺ entry pharmacology, co-localization imaging, lipid raft fractionation\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches including pharmacological selectivity, colocalization, and raft fractionation\",\n      \"pmids\": [\"19171672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Adcy8 is differentially expressed in specific brain regions of mouse strains differing in avoidance behavior, and the ADCY8 locus maps to a QTL for avoidance behavior on mouse chromosome 15 syntenic with human 8q24 (linked to bipolar disorder). Chronic carbamazepine (acting via adenylyl cyclase activity) significantly reduced mouse avoidance behavior, providing a functional link between ADCY8 and mood-related behavior.\",\n      \"method\": \"Chromosome substitution strain QTL mapping, behavioral phenotyping (automated home-cage registration), brain regional expression analysis, pharmacological intervention (carbamazepine infusion)\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — genetic mapping with expression correlation and pharmacological rescue, but indirect mechanistic link\",\n      \"pmids\": [\"19691954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AKAP79/150 directly associates with Ca²⁺-stimulable ADCY8 and limits ADCY8 sensitivity to intracellular Ca²⁺ events. This functional interaction was demonstrated in HEK293 cells overexpressing both proteins and confirmed endogenously in pancreatic insulin-secreting cells and hippocampal neurons.\",\n      \"method\": \"Co-immunoprecipitation, high-resolution live-cell cAMP imaging, endogenous expression validation in pancreatic and neuronal cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with functional consequence measured by live imaging, replicated in endogenous cell systems\",\n      \"pmids\": [\"20410303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADCY8 is required cell-autonomously in zebrafish retinal neurons for normal midline crossing. Knockdown of ADCY8 made retinal axons insensitive to the chemokine SDF1 (which normally activates cAMP signaling to antagonize slit-mediated repulsion) and induced ipsilateral misprojections. This established ADCY8 as an essential component of a signaling pathway opposing midline repellent guidance cues before axons reach their targets.\",\n      \"method\": \"Morpholino knockdown in zebrafish, in vivo retinal axon tracing, genetic epistasis with slit signaling pathway, cell-autonomous rescue experiments\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockdown with cell-autonomous rescue establishing specific pathway position\",\n      \"pmids\": [\"20505109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADCY8 is central to GLP-1 receptor signaling in pancreatic beta cells. Knockdown of ADCY8 blocked GLP-1-induced cAMP generation, Ca²⁺ signaling, CRE activation, and amplification of exocytosis. Chronic high glucose (glucotoxicity) markedly downregulated ADCY8 expression in INS-1E cells and rat/human islets, and re-expression of ADCY8 (but not GLP-1R) recovered GLP-1 signaling under glucotoxic conditions.\",\n      \"method\": \"siRNA knockdown, adenoviral re-expression, cAMP measurement, Ca²⁺ imaging, CRE reporter assay, membrane capacitance measurement of exocytosis, transcriptomic analysis, quantitative PCR in rat and human islets\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods with gain- and loss-of-function in multiple cell systems including human islets\",\n      \"pmids\": [\"21046358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ADCY8 directly binds the N-terminus of Orai1 (the SOC channel pore component) via its own amino terminus. This protein-protein interaction coordinates subcellular changes in both Ca²⁺ and cAMP at the AC8/Orai1 microdomain. High-resolution targeted biosensors showed that the direct interaction is responsible for crosstalk between the two signaling pathways, with Orai1 functioning as an integral component of the signaling complex.\",\n      \"method\": \"Protein-protein interaction assays (pulldown/co-IP), high-resolution FRET-based biosensors targeted to AC8 and Orai1 microdomains, pharmacological and genetic disruption of interaction\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct interaction identified and validated with high-resolution subcellular biosensors, multiple orthogonal methods\",\n      \"pmids\": [\"22494970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AKAP79-recruited PKA phosphorylates ADCY8 at Ser-112 within the N-terminus (near the AKAP79 association site), providing a novel negative feedback mechanism. PKA-mediated phosphorylation reduced the on-rate of cAMP production during Ca²⁺ oscillations in wild-type but not non-phosphorylatable (S112A) ADCY8 mutants. This action of PKA was not mediated indirectly through PP2A B56δ subunits.\",\n      \"method\": \"Site-directed mutagenesis (S112A), FRET-based real-time cAMP imaging during Ca²⁺ oscillations, pharmacological PKA manipulation, co-immunoprecipitation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of specific phosphorylation site validated by real-time imaging, multiple controls\",\n      \"pmids\": [\"22976297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Interleukin-1β (IL-1β) induces de novo expression of ADCY8 in vascular smooth muscle cells (VSMCs) during trans-differentiation to an inflammatory/migratory phenotype. The Notch pathway (via transcriptional targets Hrt1 and Hrt3) attenuates this IL-1β-mediated ADCY8 upregulation. In a rat carotid balloon-injury model of restenosis, de novo ADCY8 expression coincided with Notch3 pathway downregulation in vivo.\",\n      \"method\": \"Pharmacological Notch inhibition and activation in VSMCs, overexpression of Hrt1/Hrt3, IL-1β stimulation assays, in vivo rat carotid balloon-injury model with expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — genetic overexpression and pharmacological manipulation with in vivo validation, but mechanistic link is transcriptional regulation\",\n      \"pmids\": [\"22613711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AC8 enriches in lipid raft microdomains via complex N-glycosylation and cytoskeletal association during trafficking to the plasma membrane. Live-cell imaging and biochemical approaches revealed a dynamic interaction between AC8 and caveolin-1 that affects AC8 processing, targeting, and responsiveness. Site-directed mutagenesis and pharmacological approaches showed that N-glycosylation is required for proper lipid raft targeting.\",\n      \"method\": \"Live-cell imaging, biochemical fractionation, site-directed mutagenesis, pharmacological disruption of cytoskeleton and glycosylation, co-immunoprecipitation with caveolin-1\",\n      \"journal\": \"The Journal of membrane biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple methods but single-lab study with partial mechanistic follow-up\",\n      \"pmids\": [\"30746562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AC8 plays a relevant role in breast cancer cells supporting proliferation and migration. Breast cancer cells overexpress AC8, which shifts the AC8-Orai1α stoichiometry in favor of AC8, leading to impairment of PKA-dependent Orai1α inactivation (phosphorylation at serine-34) and enhanced store-operated Ca²⁺ entry (SOCE), thereby contributing to enhanced cancer hallmarks.\",\n      \"method\": \"AC8 overexpression/knockdown in breast cancer cells, Orai1α phosphorylation assays, SOCE measurement, proliferation and migration assays\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — mechanistic model with defined molecular targets but relies partly on stoichiometric inference\",\n      \"pmids\": [\"34070268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Marked cardiac-specific overexpression of ADCY8 (TGAC8 mice) drives sustained increases in heart rate, ejection fraction, and cardiac output without classical hypertrophy. Adaptation involves: increased protein synthesis, proteasome activity, and autophagy; elevated Nrf-2, Hsp90α, and ACC2 protein levels; a metabolic shift from fatty acid oxidation to aerobic glycolysis with increased pentose phosphate shunt activity; and maintenance of normal LV ATP and phosphocreatine levels despite increased energy demand. Omics identified >2,000 transcripts/proteins differing between TGAC8 and WT.\",\n      \"method\": \"Cardiac-specific transgenic mouse model, unbiased transcriptomics and proteomics, metabolic flux analysis, histology, echocardiography\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive multi-omic analysis in well-characterized genetic model with multiple functional readouts\",\n      \"pmids\": [\"36515265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structure of bovine AC8 bound to stimulatory Gαs and Ca²⁺/calmodulin was determined at 3.5 Å resolution, revealing the architecture of ordered AC8 domains bound to Gαs and forskolin. Limited proteolysis and crosslinking mass spectrometry (LiP-MS and XL-MS) identified contact sites between AC8 and its regulators CaM, Gαs, and Gβγ, and inferred conformational changes induced by these interactions. The captured state does not favor tight nucleotide binding despite well-resolved forskolin density. The extracellular surface features a negatively charged pocket as a potential site for unknown interactors.\",\n      \"method\": \"Cryo-EM (3.5 Å resolution), limited proteolysis-mass spectrometry (LiP-MS), crosslinking mass spectrometry (XL-MS)\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure combined with structural proteomics identifying regulatory contact sites\",\n      \"pmids\": [\"38351373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Chronic activation of adenylyl cyclase in TGAC8 cardiomyocytes activates cell-autonomous RelA-mediated NF-κB signaling, driven by calcium/PKA signaling. This leads non-cell-autonomously to activation of proinflammatory signaling in myocardial endothelial and smooth muscle cells, expansion of myocardial immune cells, elevated serum inflammatory cytokines, and changes in lymphoid organs—all preceding cardiac fibrosis. This establishes a calcium/PKA/RelA axis connecting cardiomyocyte ADCY8 activity to myocardial and systemic inflammation.\",\n      \"method\": \"TGAC8 transgenic mouse model, NF-κB/RelA pathway analysis, PKA inhibition, flow cytometry of immune cells, ELISA for cytokines, cardiac histology\",\n      \"journal\": \"GeroScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — genetic model with pathway pharmacology establishing mechanistic axis, single lab\",\n      \"pmids\": [\"38499959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ADCY8 deletion by CRISPR-Cas9 in U87MG glioma cells causes a system-wide remodeling of the mitochondrial proteome, shifting metabolism away from glycolysis (Warburg effect) toward oxidative phosphorylation, as evidenced by increased oxygen consumption, elevated TCA cycle flux, and decreased glycolytic flux. This metabolic shift is driven by absence of AC8-mediated transcriptional regulation.\",\n      \"method\": \"CRISPR-Cas9 knockout, quantitative proteomics, oxygen consumption rate measurement, metabolic flux analysis (TCA cycle, glycolysis)\",\n      \"journal\": \"Biochimica et biophysica acta. Bioenergetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with proteomics and functional metabolic measurements, single lab\",\n      \"pmids\": [\"40669556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Adcy8 knockout (Adcy8-/-) mice show more severe lipid accumulation under normal and high-fat diet conditions. ADCY8 regulates lipolysis in adipose tissue via the cAMP-PKA signaling pathway, controlling phosphorylation of lipolytic enzymes. Forskolin enhanced lipolysis and reduced adipocyte size in diet-induced obese wild-type mice but not in Adcy8-/- mice, demonstrating that ADCY8 is required for cAMP-PKA-mediated lipolytic responses in adipose tissue.\",\n      \"method\": \"Adcy8 knockout mouse model, high-fat diet feeding, adipose tissue histology, cAMP measurement, PKA substrate phosphorylation assays, forskolin stimulation\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with pharmacological rescue experiment defining pathway position\",\n      \"pmids\": [\"40527393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AC8 mRNA expression is upregulated in NMDAR-2B (Nr2b)-positive neurons in the contralateral anterior cingulate cortex (ACC) of mice after spared nerve injury, while AC1 expression is unchanged, suggesting an unappreciated role for ADCY8 in ACC synaptic plasticity changes associated with neuropathic pain.\",\n      \"method\": \"RNAscope in situ hybridization in spared nerve injury mouse model, cell-type-specific co-labeling\",\n      \"journal\": \"Neurobiology of pain\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single method (ISH) showing expression change without direct functional mechanism established for ADCY8\",\n      \"pmids\": [\"35005298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Lysosomal Ca²⁺ signaling (via the NAADP pathway) contributes to α-adrenergic (phenylephrine)-stimulated cAMP production in atrial myocytes through AC1 and AC8. Double knockout of Adcy1 and Adcy8 in mice reduced the positive chronotropic and inotropic response to phenylephrine in atrial tissue, decreased Ca²⁺ transient amplitude, and abolished cytosolic cAMP elevation in neonatal atrial myocytes. This response was atrium-specific (not seen in ventricular myocytes).\",\n      \"method\": \"Adcy1/Adcy8 double-knockout mouse model, NAADP pathway inhibitors (BZ-194, SAN4825, Bafilomycin A1), cAMP FRET imaging, Ca²⁺ transient measurement, chronotropy/inotropy measurement in atrial tissue\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic double-KO with pharmacological dissection in multiple readouts, but preprint\",\n      \"pmids\": [\"bio_10.1101_2024.11.25.625232\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ADCY8 (adenylyl cyclase type 8) is a Ca²⁺/calmodulin-stimulated, transmembrane adenylyl cyclase that converts ATP to cAMP selectively in response to capacitative/store-operated Ca²⁺ entry via Orai1 (to which it directly binds at its N-terminus); it is regulated by an AKAP79/150-anchored PKA complex that phosphorylates Ser-112 to provide negative feedback on cAMP production, interacts with PP2A (whose binding to the ADCY8 N-terminus is antagonized by Ca²⁺/calmodulin), and associates with caveolin-1 in lipid raft microdomains; structurally it has been resolved at 3.5 Å by cryo-EM bound to Gαs and Ca²⁺/calmodulin; functionally it is required for GLP-1 receptor signaling in pancreatic beta cells, for recovery from adaptive presynaptic silencing in neurons, for axonal midline crossing in retinal neurons (via SDF1/cAMP antagonism of slit repulsion), for cAMP-PKA-mediated lipolysis in adipose tissue, and in the heart its chronic activation engages a calcium/PKA/RelA-NF-κB inflammatory axis alongside metabolic and proteostatic adaptations.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ADCY8 (adenylyl cyclase 8) is a Ca²⁺/calmodulin-stimulated transmembrane adenylyl cyclase that converts ATP to cAMP within spatially organized signaling complexes at lipid raft microdomains of the plasma membrane, coupling store-operated Ca²⁺ entry to compartmented cAMP production. AC8 directly binds Orai1 via their amino termini to sense capacitative Ca²⁺ entry [PMID:22494970], while association with AKAP79/150 recruits PKA that phosphorylates AC8 at Ser-112 to provide negative feedback on Ca²⁺-driven cAMP synthesis [PMID:20410303, PMID:22976297]; PP2A binds the AC8 N-terminus in a Ca²⁺/calmodulin-antagonized manner, and caveolin-1 facilitates AC8 trafficking to lipid rafts [PMID:16258073, PMID:30746562]. In vivo, AC8 generates compartmented cAMP that selectively activates sarcoplasmic reticulum Ca²⁺ uptake in cardiomyocytes without affecting L-type Ca²⁺ channels [PMID:12206999], regulates adipose lipolysis via the cAMP-PKA pathway [PMID:40527393], and is required cell-autonomously in retinal neurons for midline axon crossing through SDF1-dependent cAMP antagonism of slit repellent signaling [PMID:20505109].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration that AC8-generated cAMP is compartmented in cardiomyocytes—selectively enhancing SR Ca²⁺ uptake without affecting L-type Ca²⁺ channels—established that AC8 does not flood the cell with cAMP but signals locally to specific effectors.\",\n      \"evidence\": \"Cardiac-specific AC8 transgenic mice analyzed by patch-clamp, Ca²⁺ imaging, and contractility measurements\",\n      \"pmids\": [\"12206999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of compartmentation (scaffolding partners) unknown at this stage\", \"Whether endogenous AC8 levels produce same compartmented signal not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Discovery that cardiac AC8 overexpression triggers compensatory PDE4/PDE1 upregulation explained how cAMP compartmentation is reinforced and how cardiomyocytes are protected from Ca²⁺ overload despite chronically elevated AC8 activity.\",\n      \"evidence\": \"Transgenic mouse hearts with isoform-specific PDE assays and pharmacological challenge\",\n      \"pmids\": [\"12890691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PDE upregulation is transcriptional or post-translational not resolved\", \"Mechanism by which specific PDE isoforms are recruited to AC8 microdomains unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of PP2A catalytic and scaffolding subunits as direct AC8 N-terminal binding partners—antagonized by Ca²⁺/calmodulin—revealed a phosphatase tethered to AC8 that could counterbalance kinase-mediated regulation, and placed AC8 in lipid raft fractions of brain membranes.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown from HEK293 and mouse forebrain, lipid raft fractionation\",\n      \"pmids\": [\"16258073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of PP2A on AC8 phosphorylation state not shown\", \"Identity of the specific PP2A holoenzyme complex in vivo unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Two key advances: (1) AKAP79/150 was identified as a direct AC8 scaffold limiting its Ca²⁺ sensitivity in multiple endogenous systems, and (2) AC8 was shown to be required cell-autonomously for retinal axon midline crossing via SDF1/cAMP antagonism of slit repulsion, placing AC8 in a defined developmental guidance pathway.\",\n      \"evidence\": \"Co-IP and FRET cAMP biosensors in HEK293, pancreatic β-cells, and hippocampal neurons (AKAP study); morpholino knockdown with in vivo axon tracing and epistasis in zebrafish (guidance study)\",\n      \"pmids\": [\"20410303\", \"20505109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of AKAP79-AC8 interface unknown\", \"Whether AC8 roles in axon guidance are conserved in mammals not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Three discoveries converged: PKA phosphorylation of AC8 at Ser-112 (recruited by AKAP79) was identified as the negative feedback mechanism attenuating cAMP on-rate during Ca²⁺ oscillations; AC8 was found to directly bind Orai1 N-termini, coupling store-operated Ca²⁺ entry to local cAMP synthesis; and AC8 was shown to be induced de novo by IL-1β in VSMCs during inflammatory trans-differentiation, opposed by Notch/Hrt signaling.\",\n      \"evidence\": \"Site-directed mutagenesis with FRET cAMP sensors (Ser-112); Co-IP/GST pulldown plus FRET/BRET biosensors (Orai1); VSMC transdifferentiation assays plus rat carotid balloon-injury model (IL-1β/Notch)\",\n      \"pmids\": [\"22976297\", \"22494970\", \"22613711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Orai1-AC8 complex is regulated by phosphorylation not known\", \"PP2A B56δ association with AC8 N-terminus was confirmed but its functional role remains unresolved\", \"Downstream targets of AC8-derived cAMP in trans-differentiated VSMCs not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing that AC8 undergoes complex N-glycosylation and associates dynamically with caveolin-1 for lipid raft targeting clarified the trafficking mechanism that delivers AC8 to its functional microdomain at the plasma membrane.\",\n      \"evidence\": \"Biochemical fractionation, live-cell imaging, mutagenesis, and pharmacological disruption of cytoskeleton/glycosylation in cultured cells\",\n      \"pmids\": [\"30746562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Caveolin-1 binding site on AC8 not mapped\", \"Whether glycosylation directly affects enzymatic activity unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The 3.5 Å cryo-EM structure of bovine AC8 bound to Gαs/forskolin revealed the overall architecture, an extracellular negatively charged pocket, and a catalytic state not favoring tight nucleotide binding; structural proteomics mapped contact sites for CaM, Gαs, and Gβγ regulators and conformational changes they induce.\",\n      \"evidence\": \"Cryo-EM, LiP-MS, and XL-MS of purified bovine AC8\",\n      \"pmids\": [\"38351373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of CaM-bound active state not captured\", \"Full-length AC8 with disordered N/C-terminal regulatory regions not resolved\", \"No structure with Orai1 or AKAP79 bound\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Chronic AC8 overexpression in cardiomyocytes was shown to activate a calcium/PKA/RelA NF-κB axis cell-autonomously, driving non-cell-autonomous inflammatory signaling to neighboring endothelial and smooth muscle cells, linking sustained AC8 activity to cardiac inflammation and fibrosis.\",\n      \"evidence\": \"TGAC8 transgenic mice with PKA inhibitor experiments, cytokine measurements, and histology\",\n      \"pmids\": [\"38499959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this inflammatory pathway operates at endogenous AC8 expression levels unknown\", \"Direct PKA substrate connecting to RelA activation not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Two studies expanded AC8's physiological roles: ADCY8 knockout in glioma cells shifted metabolism from glycolysis toward oxidative phosphorylation with system-wide mitochondrial proteome remodeling, while Adcy8-knockout mice showed impaired adipose lipolysis with reduced cAMP and diminished phosphorylation of lipolytic enzymes.\",\n      \"evidence\": \"CRISPR-Cas9 KO in U87MG with proteomics and ¹³C flux analysis (glioma); Adcy8-KO mice with cAMP assays, phosphorylation analysis, and high-fat diet challenge (adipose)\",\n      \"pmids\": [\"40669556\", \"40527393\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional mechanism by which AC8 remodels mitochondrial proteome not identified\", \"Whether AC8-dependent lipolysis involves AKAP79 or Orai1 scaffolding not tested\", \"Relative contribution of AC8 versus other adenylyl cyclases in adipose tissue not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of the AC8-Orai1 signaling complex, the full-length AC8 structure including disordered regulatory termini, the functional consequence of PP2A tethering on AC8 phosphorylation dynamics, and whether the NF-κB/inflammatory axis operates at physiological AC8 expression levels.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of AC8-Orai1 or AC8-AKAP79 complex\", \"PP2A functional role on AC8 not demonstrated\", \"Mechanism linking AC8 cAMP to mitochondrial proteome remodeling unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0009975\", \"supporting_discovery_ids\": [4, 6, 7]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 1, 2, 6, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 6, 8]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"AC8-Orai1 complex\",\n      \"AC8-AKAP79/150-PKA complex\",\n      \"AC8-PP2A complex\"\n    ],\n    \"partners\": [\n      \"ORAI1\",\n      \"AKAP5\",\n      \"PPP2CA\",\n      \"PPP2R1A\",\n      \"GNAS\",\n      \"CALM1\",\n      \"CAV1\",\n      \"PPP2R5D\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"ADCY8 is a Ca²⁺/calmodulin-stimulated transmembrane adenylyl cyclase that converts ATP to cAMP preferentially in response to store-operated Ca²⁺ entry, functioning as a critical node coupling calcium dynamics to compartmentalized cAMP signaling in neurons, cardiomyocytes, pancreatic beta cells, and adipocytes. Ca²⁺/calmodulin activates ADCY8 through a disinhibitory mechanism at a C-terminal IQ-like motif, while the N-terminus directly binds Orai1 to form a microdomain linking store-operated Ca²⁺ entry to cAMP production, and also recruits PP2A in a Ca²⁺/calmodulin-competitive manner; an AKAP79/150-anchored PKA complex phosphorylates Ser-112 to provide negative feedback on cAMP output [PMID:10075700, PMID:22494970, PMID:16258073, PMID:22976297]. ADCY8 is required for GLP-1 receptor-mediated cAMP generation and insulin secretion in beta cells, for recovery from presynaptic silencing in hippocampal neurons, for SDF1/cAMP-dependent retinal axon midline crossing, and for cAMP-PKA-mediated lipolysis in adipose tissue [PMID:21046358, PMID:18480272, PMID:20505109, PMID:40527393]. The 3.5 Å cryo-EM structure of AC8 bound to Gαs and Ca²⁺/calmodulin reveals the ordered domain architecture and regulatory contact sites, while chronic cardiac overexpression engages metabolic reprogramming and a calcium/PKA/RelA-NF-κB inflammatory axis [PMID:38351373, PMID:36515265, PMID:38499959].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Cloning of ADCY8 from rat brain established it as a novel Ca²⁺/calmodulin-stimulated adenylyl cyclase with synergistic Gαs activation and predominant hippocampal/cortical expression, defining the founding biochemical identity of the enzyme.\",\n      \"evidence\": \"cDNA cloning with heterologous expression in HEK293 cells, enzymatic activity assays, in situ hybridization\",\n      \"pmids\": [\"8163524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CaM stimulation unknown\", \"In vivo function not addressed\", \"No information on post-translational regulation\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of two calmodulin-binding sites (N-terminal Ca²⁺-dependent and C-terminal IQ-like) and demonstration that Ca²⁺/calmodulin activates ADCY8 through a disinhibitory mechanism at the C-terminal site resolved the long-standing question of how calcium stimulation is transduced.\",\n      \"evidence\": \"Overlay assays, site-directed mutagenesis, synthetic peptide studies, and functional activity assays\",\n      \"pmids\": [\"10075700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural visualization of CaM-AC8 interaction not achieved\", \"Relative contribution of each CaM lobe unresolved\", \"In vivo relevance of disinhibition model untested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Cardiac-specific transgenic overexpression revealed that ADCY8-generated cAMP enhances SR Ca²⁺ uptake and contractility without affecting L-type Ca²⁺ channels, establishing that cAMP produced by ADCY8 is functionally compartmentalized in cardiomyocytes.\",\n      \"evidence\": \"Transgenic mouse model with Langendorff perfusion, patch-clamp, and fluorescent Ca²⁺ imaging\",\n      \"pmids\": [\"12206999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of cAMP compartmentation not identified\", \"Role of endogenous cardiac ADCY8 vs overexpression artifacts unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The discovery that cardiac ADCY8 overexpression selectively remodels PDE isoform activity (upregulating PDE4/PDE1 for cAMP while decreasing PDE1/PDE2 for cGMP) explained the mechanism shielding L-type Ca²⁺ channels from cAMP elevation.\",\n      \"evidence\": \"PDE activity assays, pharmacological stimulation, and electrophysiology in transgenic mice\",\n      \"pmids\": [\"12890691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PDE remodeling is a direct ADCY8 effect or secondary adaptation unknown\", \"Physiological relevance under non-overexpression conditions untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of PP2A as a direct N-terminal binding partner of ADCY8, with Ca²⁺/calmodulin competitively displacing PP2A, revealed a regulatory switch connecting phosphatase and cyclase activities at the same signaling microdomain in lipid rafts.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, PP2A enzymatic activity assays, lipid raft co-fractionation in HEK293 and mouse forebrain\",\n      \"pmids\": [\"16258073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological substrates of ADCY8-associated PP2A unknown\", \"Whether PP2A modulates ADCY8 catalytic activity directly not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetic dissection using single and double knockout mice demonstrated a specific, non-redundant role for ADCY8 (but not AC1) in recovery from depolarization-induced presynaptic silencing, establishing its unique contribution to activity-dependent synaptic resetting.\",\n      \"evidence\": \"AC1⁻/⁻, AC8⁻/⁻, and double-KO neurons with presynaptic silencing assays and cAMP pharmacology\",\n      \"pmids\": [\"18480272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream cAMP targets mediating recovery unidentified\", \"Brain region and circuit specificity of this role not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Real-time FRET-based cAMP imaging demonstrated that ADCY8 is preferentially activated by capacitative Ca²⁺ entry over other Ca²⁺ sources, with differential calmodulin N- and C-lobe dependence distinguishing it from AC1, establishing the Ca²⁺ entry mode selectivity concept.\",\n      \"evidence\": \"FRET cAMP sensors, Ca²⁺ entry mode pharmacology, calmodulin lobe mutagenesis\",\n      \"pmids\": [\"19029295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical basis for preferential coupling to CCE not yet identified\", \"Whether lobe selectivity applies in native neurons untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The finding that Orai1/STIM1-mediated store-operated Ca²⁺ entry (but not TRPC channels) specifically activates ADCY8, with all three proteins co-distributing in lipid rafts, identified the molecular components of the CCE-cAMP microdomain.\",\n      \"evidence\": \"Co-expression, adenylyl cyclase assays, Ca²⁺ entry pharmacology, co-localization imaging, and raft fractionation in HEK293 cells\",\n      \"pmids\": [\"19171672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct protein-protein interaction between AC8 and Orai1 not yet demonstrated\", \"Native tissue validation limited\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Three advances established ADCY8's non-redundant physiological roles: AKAP79/150 was shown to scaffold AC8 and limit its Ca²⁺ sensitivity in pancreatic beta cells and neurons; ADCY8 knockdown blocked GLP-1-mediated cAMP, Ca²⁺ signaling, and insulin exocytosis (with glucotoxicity downregulating ADCY8 as a disease-relevant mechanism); and morpholino knockdown in zebrafish proved ADCY8 is required cell-autonomously for SDF1/cAMP-mediated retinal axon midline crossing.\",\n      \"evidence\": \"Co-IP and live-cell cAMP imaging with endogenous validation (AKAP79); siRNA/adenoviral rescue in INS-1E cells, rat and human islets (GLP-1); morpholino knockdown with cell-autonomous rescue in zebrafish (axon guidance)\",\n      \"pmids\": [\"20410303\", \"21046358\", \"20505109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AKAP79 binding site on AC8 not mapped\", \"Which AC8 domains mediate GLP-1R coupling unknown\", \"Mammalian validation of axon guidance role lacking\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstration that the ADCY8 N-terminus directly binds Orai1's N-terminus, coordinating local Ca²⁺ and cAMP signals, and that AKAP79-recruited PKA phosphorylates Ser-112 as a negative feedback mechanism, completed the core regulatory circuit of the AC8 signaling microdomain.\",\n      \"evidence\": \"Pulldown/co-IP, FRET biosensors targeted to AC8/Orai1 microdomains (Orai1 binding); S112A mutagenesis with real-time cAMP imaging during Ca²⁺ oscillations (PKA feedback)\",\n      \"pmids\": [\"22494970\", \"22976297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of AC8-Orai1 interaction unresolved\", \"Additional phosphorylation sites on AC8 not surveyed\", \"Whether Ser-112 phosphorylation occurs in vivo not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The role of complex N-glycosylation and cytoskeletal association in targeting ADCY8 to caveolin-1-containing lipid rafts explained how ADCY8 achieves its specific plasma membrane microdomain localization required for signaling fidelity.\",\n      \"evidence\": \"Live-cell imaging, biochemical fractionation, mutagenesis of glycosylation sites, caveolin-1 co-IP\",\n      \"pmids\": [\"30746562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific glycosylation sites critical for raft targeting not fully mapped\", \"Single-lab study without independent replication\", \"In vivo consequences of mislocalization untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Comprehensive multi-omic profiling of cardiac ADCY8-overexpressing mice revealed system-level metabolic adaptation — a shift from fatty acid oxidation to aerobic glycolysis with enhanced pentose phosphate shunt activity, upregulated proteasome/autophagy, and maintained ATP homeostasis — explaining how the heart tolerates chronic cAMP elevation without hypertrophy.\",\n      \"evidence\": \"Transgenic TGAC8 mouse model with transcriptomics, proteomics, metabolic flux analysis, echocardiography\",\n      \"pmids\": [\"36515265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal hierarchy among metabolic adaptations not established\", \"Whether adaptations are reversible upon ADCY8 normalization unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The 3.5 Å cryo-EM structure of AC8 bound to Gαs and Ca²⁺/calmodulin provided the first high-resolution view of a Ca²⁺-stimulated adenylyl cyclase, revealing ordered domain architecture, Gαs and CaM contact sites, and a negatively charged extracellular pocket of unknown function, while the captured state unexpectedly disfavored tight nucleotide binding.\",\n      \"evidence\": \"Cryo-EM at 3.5 Å, LiP-MS, and crosslinking mass spectrometry of bovine AC8\",\n      \"pmids\": [\"38351373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Active catalytic conformation with bound substrate not captured\", \"CaM-induced conformational changes not fully resolved\", \"Functional significance of extracellular pocket unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that chronic ADCY8-driven cAMP activates a cell-autonomous calcium/PKA/RelA-NF-κB inflammatory axis in cardiomyocytes, triggering non-cell-autonomous immune cell expansion and systemic inflammation preceding fibrosis, linked AC8 activity to inflammatory pathology.\",\n      \"evidence\": \"TGAC8 mice with NF-κB/RelA analysis, PKA inhibition, flow cytometry, ELISA, cardiac histology\",\n      \"pmids\": [\"38499959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether endogenous AC8 levels can drive this axis unknown\", \"Single-lab study\", \"Specific PKA substrates upstream of RelA not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Two studies extended ADCY8's metabolic roles: CRISPR deletion in glioma cells reversed the Warburg effect by shifting metabolism toward oxidative phosphorylation, while Adcy8⁻/⁻ mice showed impaired adipose lipolysis with loss of forskolin-responsive cAMP-PKA signaling, establishing ADCY8 as a required component of lipolytic cAMP generation in vivo.\",\n      \"evidence\": \"CRISPR-KO in U87MG with proteomics and metabolic flux analysis (glioma); Adcy8⁻/⁻ mice on normal and high-fat diets with cAMP/PKA substrate assays (adipose)\",\n      \"pmids\": [\"40669556\", \"40527393\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AC8's metabolic role in glioma is generalizable across tumor types untested\", \"Adipose tissue phenotype not yet linked to specific AC8-interacting proteins\", \"Both are single-lab findings requiring replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of the AC8-Orai1 interaction and how it is regulated, whether Ser-112 phosphorylation feedback operates in vivo, the identity of the extracellular pocket ligand revealed by cryo-EM, and whether endogenous cardiac AC8 levels can drive the NF-κB inflammatory axis observed in overexpression models.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No AC8-Orai1 co-structure exists\", \"In vivo Ser-112 phosphorylation not confirmed\", \"Extracellular pocket function unknown\", \"Endogenous cardiac AC8 contribution to inflammation not tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0009975\", \"supporting_discovery_ids\": [0, 1, 7, 12, 19]},\n      {\"term_id\": \"GO:0016849\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 8, 13, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 7, 8, 10, 12, 13, 14]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [6, 11]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [18, 21, 22]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"complexes\": [\n      \"AC8-Orai1-STIM1 store-operated Ca²⁺ entry microdomain\",\n      \"AC8-AKAP79/150-PKA signaling complex\",\n      \"AC8-PP2A core dimer complex\"\n    ],\n    \"partners\": [\n      \"ORAI1\",\n      \"STIM1\",\n      \"AKAP5\",\n      \"PPP2CA\",\n      \"PPP2R1A\",\n      \"GNAS\",\n      \"CALM1\",\n      \"CAV1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}