{"gene":"AIM2","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":2009,"finding":"AIM2 HIN200 domain binds cytosolic dsDNA, while the AIM2 pyrin domain associates with ASC to activate both NF-κB and caspase-1; knockdown of AIM2 abrogates caspase-1 activation in response to cytoplasmic dsDNA and vaccinia virus, identifying AIM2 as a cytosolic DNA receptor that forms a caspase-1-activating inflammasome with ASC.","method":"siRNA knockdown, domain-mapping experiments (HIN200 DNA binding, pyrin-ASC association), NF-κB and caspase-1 activation assays in mouse and human cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal domain mapping, functional knockdown, replicated across mouse and human cells, two independent Nature papers simultaneously","pmids":["19158675"],"is_preprint":false},{"year":2009,"finding":"AIM2 senses cytoplasmic DNA via its OB (oligonucleotide/oligosaccharide-binding) domain, interacts with ASC through its pyrin domain to activate caspase-1, induces ASC pyroptosome formation and pyroptotic cell death; AIM2 oligomerizes upon DNA stimulation; stable expression in HEK293T cells confers DNA responsiveness.","method":"siRNA knockdown in human and mouse macrophages, stable AIM2 expression in HEK293T cells, ASC pyroptosome formation assay, caspase-1 activation assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reconstitution in non-responsive cell line, knockdown with defined phenotypic readout, two orthogonal methods, independently replicated","pmids":["19158676"],"is_preprint":false},{"year":2013,"finding":"AIM2 inflammasome activates both caspase-8 and caspase-1, leading to apoptotic and pyroptotic cell death; caspase-8 is the apical caspase in AIM2-dependent apoptosis (with little requirement for caspase-9); procaspase-8 localizes to ASC inflammasome specks and binds directly to the pyrin domain of ASC.","method":"Gene knockdown, live-cell imaging, co-immunoprecipitation, immunofluorescence localization of caspase-8 to ASC specks","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding shown by Co-IP, localization confirmed by imaging, knockdown with defined cell death phenotype, two orthogonal methods in one study","pmids":["23645208"],"is_preprint":false},{"year":2016,"finding":"TRIM11 binds AIM2 via its PS domain, undergoes auto-polyubiquitination at K458, and recruits the autophagic cargo receptor p62, thereby delivering AIM2 to autophagosomes for selective autophagic degradation; this suppresses AIM2 inflammasome activation.","method":"Co-immunoprecipitation, mutagenesis (K458 ubiquitination site), autophagy assays, p62 pulldown, gene knockdown","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, site-directed mutagenesis, functional degradation assay, multiple orthogonal methods in one study","pmids":["27498865"],"is_preprint":false},{"year":2016,"finding":"AIM2 senses radiation-induced DNA damage in the nucleus to mediate caspase-1-dependent inflammasome activation and cell death; AIM2-deficient mice are protected from irradiation-induced gastrointestinal syndrome and hematopoietic failure.","method":"AIM2-knockout mice, irradiation model, nuclear localization studies, caspase-1 activation assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined mechanistic phenotype, nuclear DNA damage sensing demonstrated, replicated in two tissue systems","pmids":["27846608"],"is_preprint":false},{"year":2016,"finding":"PKM2-mediated aerobic glycolysis promotes AIM2 inflammasome activation by modulating EIF2AK2 phosphorylation in macrophages; pharmacological and genetic inhibition of PKM2 or EIF2AK2 attenuates AIM2 inflammasome activation.","method":"PKM2 knockout (myeloid-conditional), EIF2AK2 pharmacological and genetic inhibition, inflammasome activation assays (IL-1β, IL-18 secretion), phosphorylation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO and pharmacological inhibition, EIF2AK2 phosphorylation mechanistic link, multiple orthogonal approaches","pmids":["27779186"],"is_preprint":false},{"year":2017,"finding":"Cholesterol-25-hydroxylase (Ch25h) produces 25-hydroxycholesterol (25-HC) to repress SREBP2 and cholesterol synthesis; increased macrophage cholesterol content triggers AIM2-dependent IL-1β release independently of crystals; Ch25h deficiency leads to mitochondrial DNA release into the cytosol which activates AIM2; AIM2 deficiency rescues the increased inflammasome activity in Ch25h-/- macrophages.","method":"Ch25h-/- and AIM2-/- genetic mouse models, cholesterol loading experiments, mitochondrial DNA cytosolic release assay, IL-1β secretion assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — double KO epistasis, defined molecular pathway from cholesterol to mtDNA release to AIM2 activation, multiple genetic models","pmids":["29033131"],"is_preprint":false},{"year":2017,"finding":"AIM2 antagonizes mouse ALR IFI205-mediated interferon induction activity by sequestering IFI205 from STING, thus negatively regulating the cytosolic DNA-triggered type I IFN response.","method":"ALR overexpression and knockdown experiments, IFN induction assays, co-immunoprecipitation showing AIM2-IFI205 interaction","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP/sequestration assay, functional IFN induction assay, single lab but two orthogonal readouts","pmids":["28679751"],"is_preprint":false},{"year":2019,"finding":"AIM2 interacts with the RACK1-PP2A phosphatase complex in T regulatory cells to restrain AKT phosphorylation, attenuating mTOR and MYC signaling and glycolysis while promoting oxidative phosphorylation; this inflammasome-independent function promotes Treg cell stability.","method":"RNA-seq, biochemical co-immunoprecipitation (AIM2-RACK1-PP2A complex), metabolic assays (glycolysis/OXPHOS), AIM2-conditional KO in T cells, lineage tracing","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identifying AIM2-RACK1-PP2A complex, metabolic functional assays, T cell-conditional KO, multiple orthogonal methods","pmids":["33505023"],"is_preprint":false},{"year":2020,"finding":"AIM2 negatively regulates the DNA-PK–AKT3 signaling axis in microglia in an inflammasome-independent manner, thereby controlling cGAS- and DNA-PK-synergistically induced neuroinflammation during experimental autoimmune encephalomyelitis.","method":"AIM2-/- mice, microglial-specific analysis, DNA-PK inhibitor treatment, AKT3 phosphorylation assays","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined pathway placement, pharmacological confirmation with DNA-PK inhibitor, single lab","pmids":["33710283"],"is_preprint":false},{"year":2020,"finding":"AIM2 inflammasome contributes to CNS homeostasis by regulating gasdermin-D-dependent pyroptosis (not IL-1/IL-18 cytokine production) to remove genetically compromised cells during neurodevelopment; AIM2 deficiency results in decreased neural cell death and excessive accumulation of DNA-damaged neurons in the adult brain.","method":"AIM2-knockout mice, gasdermin-D-knockout mice, DNA damage-inducing agents, cell death quantification, behavioral analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO genetic models, GSDMD-specific pathway placement distinguishing from IL-1/IL-18 axis, multiple phenotypic readouts","pmids":["32350463"],"is_preprint":false},{"year":2020,"finding":"AIM2 colocalized with mitochondria in NSCLC cells; AIM2 knockdown leads to MFN2 upregulation, enhanced mitochondrial fusion, decreased ROS production, and inactivation of MAPK/ERK signaling, reducing tumor cell proliferation independent of inflammasome activation.","method":"AIM2 knockdown/overexpression, mitochondrial colocalization (fluorescence), MFN2 protein analysis, ROS measurement, MAPK/ERK pathway assays, xenograft in vivo model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — colocalization by imaging, MFN2 functional link, pathway analysis in vitro and in vivo, but mechanistic details limited to single lab","pmids":["32005973"],"is_preprint":false},{"year":2021,"finding":"AIM2 forms a large multi-protein PANoptosome complex with pyrin, ZBP1, ASC, caspase-1, caspase-8, RIPK3, RIPK1 and FADD to drive PANoptosis; AIM2 regulates pyrin and ZBP1 innate immune sensors during HSV-1 and Francisella novicida infection.","method":"Co-immunoprecipitation of multi-protein complex, AIM2/pyrin/ZBP1 knockout mice, cell death assays, infection models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP demonstrating multi-protein complex assembly, multiple genetic KOs, defined functional consequence in infection","pmids":["34471287"],"is_preprint":false},{"year":2021,"finding":"USP21 deubiquitinase binds to AIM2 upon DNA stimulation and deubiquitinates it, increasing AIM2 protein stability; in resting macrophages AIM2 is constitutively ubiquitinated and undergoes proteasomal degradation; USP21-mediated deubiquitination is required for AIM2-ASC complex assembly (but does not affect AIM2 DNA-binding ability).","method":"Co-immunoprecipitation, ubiquitination assays, proteasome inhibition, USP21 knockdown, AIM2-ASC complex formation assay, DNA-binding assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination/deubiquitination biochemical assay, functional dissection of DNA-binding vs. complex assembly, multiple orthogonal methods","pmids":["34470856"],"is_preprint":false},{"year":2021,"finding":"STAT3, activated by IL-11 cytokine signaling, transcriptionally upregulates AIM2 in gastric tumor epithelium; AIM2 physically interacts with microtubule end-binding protein EB1 to promote epithelial cell migration and tumourigenesis independent of inflammasome activity.","method":"ChIP (STAT3 binding to AIM2 promoter), Co-immunoprecipitation (AIM2-EB1 interaction), genetic AIM2 targeting in gp130F/F mouse model, xenograft, in vitro migration assays","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP confirming STAT3-AIM2 transcriptional regulation, Co-IP of AIM2-EB1 complex, in vivo mouse model with genetic manipulation, multiple orthogonal methods","pmids":["34489308"],"is_preprint":false},{"year":2021,"finding":"AIM2 deficiency in B cells leads to increased Blimp-1 expression and reduced Bcl-6 expression, regulating B-cell differentiation; AIM2 acts upstream of the Blimp-1–Bcl-6 axis (silencing Blimp-1 or Bcl-6 had no effect on AIM2 expression); IL-10 upregulates AIM2 expression via DNA demethylation.","method":"B cell-conditional AIM2 knockout mice, Western blot/qPCR for Blimp-1 and Bcl-6, siRNA knockdown of Blimp-1/Bcl-6, DNA methylation analysis","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO, epistasis experiment placing AIM2 upstream of Blimp-1/Bcl-6, epigenetic regulation assay, single lab","pmids":["34521812"],"is_preprint":false},{"year":2021,"finding":"AIM2 inflammasome activation in JAK2V617F macrophages is driven by oxidative DNA damage and DNA replication stress; Aim2 deficiency reduces atherosclerosis in clonal haematopoiesis models; deletion of caspase-1/11, gasdermin D, or AIM2 reverses adverse atherosclerotic changes.","method":"Jak2VF selective macrophage expression, Aim2-/- mice, caspase-1/11-/- and gasdermin D-/- mice, atherosclerosis quantification, DNA damage markers, scRNA-seq","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent genetic KO models, epistasis placing AIM2 downstream of replication stress/DNA damage, replicated phenotype","pmids":["33731931"],"is_preprint":false},{"year":2016,"finding":"AIM2 inhibits STING-dependent selective autophagy and IFN-β secretion during M. bovis infection by competitively binding cytosolic mycobacterial DNA, thereby restricting STING-TBK1-dependent pathway activation.","method":"AIM2 knockdown/overexpression in macrophages, autophagy assays, STING pathway analysis, IFN-β secretion measurement","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional pathway placement by knockdown, STING-TBK1 pathway assays, single lab but two orthogonal readouts (autophagy and IFN-β)","pmids":["27409673"],"is_preprint":false},{"year":2021,"finding":"In microglia, AIM2 reduces cGAS-mediated antiviral inflammation by inhibiting AKT-IRF3 phosphorylation in an inflammasome-independent manner; microglial AIM2 deficiency exacerbates both MPTP-induced and transgenic PD models.","method":"AIM2-/- and bone marrow chimeric mice, MPTP model, RNA-sequencing, primary microglial transfection, AKT-IRF3 phosphorylation assays","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO, chimeric mice for cell-type specificity, mechanistic phosphorylation analysis, single lab","pmids":["35959803"],"is_preprint":false},{"year":2023,"finding":"AIM2 filament assembly on dsDNA is essential for nucleic acid specificity: AIM2 binds various nucleic acids but preferentially assembles ordered filaments on dsDNA in a duplex length-dependent manner; only filaments assembled on dsDNA induce downstream ASC polymerization; oligomers on other nucleic acids fail to trigger ASC polymerization.","method":"In vitro biochemical filament assembly assays, cryo-EM structural analysis, ASC polymerization assays with different nucleic acid substrates","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple nucleic acid substrates, structural analysis, functional ASC polymerization readout, single lab but rigorous mechanistic study","pmids":["36864667"],"is_preprint":false},{"year":2023,"finding":"AIM2 assembly on dsDNA proceeds via two distinct mechanisms resembling primary nucleation (incoming AIM2 binds adjacent dsDNA) and secondary nucleation (incoming AIM2 directly contacts DNA-bound AIM2 assemblies); oligomer size can increase fourfold in seconds; single AIM2 molecules do not diffuse/scan along DNA.","method":"Single-molecule optical trap + confocal fluorescence microscopy, kinetic rate measurements of association and dissociation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule reconstitution with direct kinetic measurement, two distinct mechanistic pathways identified, rigorous quantitative method","pmids":["38042863"],"is_preprint":false},{"year":2023,"finding":"Pristimerin enhances K63-linked ubiquitin chains on PYCARD/ASC at K158/161 by binding the Cys53 site of deubiquitinase USP50, blocking USP50-mediated removal of these chains; the K63-ubiquitinated PYCARD/ASC serves as recognition signal for SQSTM1/p62-mediated autophagic degradation of the AIM2-PYCARD/ASC complex.","method":"Drug affinity responsive target stability (DARTS) assay, site-directed mutagenesis (Cys53, K158/161), Co-IP, ubiquitination assays, autophagy assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — DARTS binding assay, mutagenesis of ubiquitination sites and USP50 binding site, Co-IP, multiple orthogonal biochemical methods","pmids":["37647255"],"is_preprint":false},{"year":2023,"finding":"EIF2AK2 directly targets AIM2 protein (shown by Co-IP) and positively regulates AIM2 expression, thereby upregulating AIM2 to activate PANoptosis in septic AKI.","method":"Co-immunoprecipitation, siRNA knockdown of EIF2AK2 and AIM2, LDH cytotoxicity assay, CLP mouse model","journal":"Renal failure","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP showing direct binding, functional knockdown, single lab with two orthogonal methods","pmids":["39311631"],"is_preprint":false},{"year":2023,"finding":"TRIM11 promotes selective autophagic degradation of AIM2 by inducing AIM2 ubiquitination and p62 binding in CD4+ T cells, attenuating Treg cell differentiation; AIM2 attenuates AKT and FOXO1 phosphorylation, MYC signaling, and glycolysis to promote Treg stability in this context.","method":"Co-immunoprecipitation (TRIM11-AIM2 interaction), ubiquitination assays, AIM2-/- and TRIM11-/- mice in EAE model, metabolic assays, T cell differentiation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination biochemistry, genetic KO models, multiple functional readouts, mechanistically extends published AIM2-RACK1-PP2A finding","pmids":["37804507"],"is_preprint":false},{"year":2021,"finding":"Nuclear AIM2-like receptors (ALRs) bind to chromatin and interfere with chromatin decompaction required for DNA repair, thereby inhibiting DNA repair and accelerating genome destabilization, micronuclei generation, and cell death; this function is uncoupled from their role in innate immunity/inflammasome.","method":"ALR-knockout mice, irradiation-induced bone marrow injury model, chromatin binding assays, DNA repair assays, micronuclei quantification","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ALR-KO genetic model, chromatin binding assay, functional DNA repair readout, single lab but novel subcellular mechanism","pmids":["34658166"],"is_preprint":false},{"year":2014,"finding":"HMGB1-DNA complex initially induces AIM2-dependent inflammasome activation and IL-1β release via RAGE; subsequently HMGB1-DNA complex triggers ATG5-dependent autophagy through RAGE, which functions as a negative feedback to limit AIM2 inflammasome activation.","method":"RAGE-blocking experiments, ATG5 knockdown, AIM2 inflammasome activation assays, IL-1β ELISA, autophagy assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — RAGE-dependent pathway placement by blocking, ATG5 knockdown epistasis, single lab with two orthogonal readouts","pmids":["24971542"],"is_preprint":false},{"year":2022,"finding":"AIM2 promotes FOXO3a phosphorylation and proteasome-mediated degradation, reducing FOXO3a transcriptional activation of ACSL4, thereby inhibiting ferroptosis to promote renal cell carcinoma progression in an inflammasome-independent manner.","method":"AIM2 knockdown/overexpression in RCC cells, FOXO3a phosphorylation and degradation assays, ACSL4 expression analysis, ferroptosis assays","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional pathway dissection with KD/OE, FOXO3a-ACSL4 axis mechanistically defined, single lab","pmids":["36923928"],"is_preprint":false},{"year":2020,"finding":"AIM2 inhibits colorectal cancer cell proliferation and migration through Gli1 suppression via a Smoothened-independent pathway, and regulates the AKT/mTOR/Gli1 signaling axis; AKT inhibition reverses increased Gli1 and EMT induced by AIM2 depletion.","method":"AIM2 knockdown/overexpression, Gli1 expression analysis, AKT inhibitor (Ly294002) treatment, proliferation/migration assays, Western blot","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional pathway placement by epistasis with AKT inhibitor, single lab, KD/OE with defined phenotypic readout","pmids":["33291082"],"is_preprint":false},{"year":2022,"finding":"AIM2 and IFI16 bind neutrophil extracellular traps (NETs) in vitro and in SLE renal tissues; ALR binding causes NETs to resist degradation by DNase I, suggesting extracellular ALR-NET interactions may promote sustained IFN signaling.","method":"Immunoprecipitation (autoantibody detection), immunofluorescence of ALR-NET binding, DNase I protection assay, confocal microscopy of SLE renal tissue","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct binding shown by immunofluorescence, functional DNase resistance assay, in vivo tissue confirmation, single lab","pmids":["35608258"],"is_preprint":false},{"year":2024,"finding":"AIM2 localizes to mitochondria in mouse hepatocytes; overexpression amplifies autophagy while dampening JNK phosphorylation; AIM2 deficiency in aged mice exacerbates APAP-induced liver injury by increasing oxidative stress and augmenting JNK/ERK phosphorylation, independent of inflammasome activation.","method":"AIM2-KO mice, AIM2 overexpression in hepatocytes, mitochondrial localization assay, autophagy assays, JNK/ERK phosphorylation analysis, rapamycin treatment","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mitochondrial localization demonstrated, genetic KO with pharmacological rescue, multiple pathway readouts, single lab","pmids":["38429284"],"is_preprint":false}],"current_model":"AIM2 is a cytosolic dsDNA sensor whose HIN200/OB domain binds dsDNA (with length-dependent filament assembly providing nucleic acid specificity), and whose N-terminal pyrin domain recruits ASC via PYD-PYD interactions to nucleate ASC filaments and activate caspase-1, driving IL-1β/IL-18 maturation and gasdermin-D-dependent pyroptosis; AIM2 ubiquitination status is controlled by the TRIM11 E3 ligase and USP21 deubiquitinase to regulate its stability and ASC complex assembly, while p62-mediated selective autophagy degrades the AIM2-ASC complex; beyond canonical inflammasome activity, AIM2 exerts inflammasome-independent functions including sequestering IFI205/STING to modulate type I IFN responses, inhibiting DNA-PK–AKT3 and cGAS-AKT-IRF3 signaling in microglia, interacting with the RACK1-PP2A complex to restrain AKT-mTOR signaling in Treg cells, binding EB1 to promote cell migration, inhibiting DNA repair by interfering with chromatin decompaction in the nucleus, and regulating mitochondrial dynamics via MFN2."},"narrative":{"mechanistic_narrative":"AIM2 is a cytosolic double-stranded DNA sensor that nucleates a caspase-1-activating inflammasome, coupling detection of aberrant DNA to inflammatory cell death [PMID:19158675, PMID:19158676]. It binds dsDNA through its HIN200/OB domain and engages ASC through its N-terminal pyrin domain, oligomerizing upon DNA stimulation to drive ASC pyroptosome formation, caspase-1 activation, and pyroptotic death [PMID:19158675, PMID:19158676]. Nucleic-acid specificity arises from filament assembly: AIM2 binds diverse nucleic acids but preferentially forms ordered filaments on dsDNA in a duplex-length-dependent manner, and only dsDNA-templated filaments — built through primary and secondary nucleation rather than diffusive scanning — trigger downstream ASC polymerization [PMID:36864667, PMID:38042863]. Beyond IL-1β/IL-18 maturation, AIM2 sensing of nuclear radiation-induced DNA damage and of cytosolic mitochondrial or replication-stress DNA links genotoxic and metabolic stress to inflammasome-driven tissue pathology, and a gasdermin-D-dependent pyroptotic arm clears DNA-damaged cells during neurodevelopment without cytokine output [PMID:27846608, PMID:29033131, PMID:33731931, PMID:32350463]. The inflammasome also expands into larger death-signaling assemblies, recruiting caspase-8 and forming a multiprotein PANoptosome with pyrin, ZBP1, RIPK1/3, FADD and caspase-1/8 to drive PANoptosis during infection [PMID:23645208, PMID:34471287]. AIM2 abundance and complex assembly are gated by ubiquitination: TRIM11 ubiquitinates AIM2 and recruits p62 for selective autophagic degradation, USP21 deubiquitinates AIM2 upon DNA stimulation to stabilize it and permit AIM2–ASC assembly, and K63-ubiquitination of ASC marks the AIM2–ASC complex for p62-mediated autophagy [PMID:27498865, PMID:34470856, PMID:37647255]. AIM2 additionally performs inflammasome-independent functions across cell types — restraining type I IFN signaling by sequestering IFI205 from STING and by inhibiting cGAS/DNA-PK–AKT–IRF3 axes in microglia [PMID:28679751, PMID:33710283, PMID:35959803], binding the RACK1–PP2A complex to suppress AKT–mTOR signaling and stabilize Treg cells [PMID:33505023], binding the microtubule end-binding protein EB1 to promote epithelial migration and tumorigenesis [PMID:34489308], and modulating mitochondrial dynamics via MFN2 [PMID:32005973].","teleology":[{"year":2009,"claim":"Established the core identity of AIM2 as the missing cytosolic DNA receptor that converts dsDNA detection into caspase-1 activation, defining a domain logic (DNA-binding HIN200/OB plus ASC-engaging pyrin) for the inflammasome.","evidence":"siRNA knockdown and domain-mapping in mouse/human cells plus reconstitution in non-responsive HEK293T, with caspase-1 and ASC pyroptosome readouts","pmids":["19158675","19158676"],"confidence":"High","gaps":["Atomic basis of DNA-binding specificity not yet resolved","How oligomerization nucleates ASC was not mechanistically defined"]},{"year":2013,"claim":"Showed the AIM2 inflammasome is not solely pyroptotic — it recruits caspase-8 as an apical caspase to also drive apoptosis, broadening its death-signaling repertoire.","evidence":"knockdown, live-cell imaging, Co-IP, and immunofluorescence of caspase-8 at ASC specks","pmids":["23645208"],"confidence":"High","gaps":["Determinants choosing apoptotic vs pyroptotic outcome unclear","Direct caspase-8 binding to ASC PYD not structurally defined"]},{"year":2016,"claim":"Defined post-translational and metabolic control of AIM2: TRIM11/p62 autophagic degradation limits activation, while PKM2-driven glycolysis and EIF2AK2 phosphorylation promote it, and STING-pathway competition links AIM2 to IFN restriction.","evidence":"Co-IP, K458 mutagenesis, autophagy/p62 assays, conditional PKM2 KO, EIF2AK2 inhibition, and macrophage STING/IFN assays","pmids":["27498865","27779186","27409673"],"confidence":"High","gaps":["Ubiquitin linkage type on AIM2 not specified","How glycolytic flux mechanistically gates inflammasome assembly unresolved"]},{"year":2016,"claim":"Demonstrated AIM2 senses DNA damage in the nucleus and cholesterol-driven mtDNA release in cytosol, expanding its triggers from foreign DNA to endogenous genotoxic and metabolic stress with defined in vivo pathology.","evidence":"AIM2-KO and Ch25h-KO mice, irradiation and cholesterol-loading models, mtDNA cytosolic release and IL-1β assays","pmids":["27846608","29033131"],"confidence":"High","gaps":["How nuclear AIM2 accesses damaged DNA mechanistically unclear","Whether the same filament mechanism operates on endogenous DNA not tested"]},{"year":2017,"claim":"Revealed an inflammasome-independent role in restraining type I IFN by sequestering the ALR IFI205 away from STING, positioning AIM2 as a negative regulator of cytosolic DNA-triggered IFN.","evidence":"ALR overexpression/knockdown, IFN induction assays, and AIM2-IFI205 Co-IP","pmids":["28679751"],"confidence":"Medium","gaps":["Single-lab Co-IP without reciprocal structural validation","Human relevance of mouse IFI205 axis untested"]},{"year":2020,"claim":"Extended AIM2's inflammasome-independent functions into adaptive and neural contexts — restraining AKT-mTOR via RACK1-PP2A in Treg cells, suppressing DNA-PK-AKT3 and cGAS-AKT-IRF3 signaling in microglia, and modulating MFN2-dependent mitochondrial dynamics in tumor cells.","evidence":"T-cell- and microglia-conditional/KO mice, Co-IP of AIM2-RACK1-PP2A, AKT3/IRF3 phospho-assays, MFN2/ROS and MAPK readouts in NSCLC with xenografts","pmids":["33505023","33710283","32005973","35959803"],"confidence":"Medium","gaps":["Direct vs indirect engagement of these kinase axes not always resolved","How a DNA sensor relocalizes to mitochondria or cytosolic scaffolds unclear"]},{"year":2020,"claim":"Showed the AIM2 inflammasome contributes to CNS homeostasis via a gasdermin-D-dependent pyroptotic arm that clears DNA-damaged neurons during development, dissociating cell-death function from IL-1/IL-18 cytokine output.","evidence":"AIM2-KO and GSDMD-KO mice, DNA-damage agents, cell-death quantification, and behavioral analysis","pmids":["32350463"],"confidence":"High","gaps":["Trigger for developmental AIM2 activation not defined","Why cytokine output is bypassed mechanistically unclear"]},{"year":2021,"claim":"Defined ubiquitin-switch and complex-assembly control: USP21 deubiquitinates AIM2 upon DNA sensing to stabilize it and enable AIM2-ASC assembly without affecting DNA binding; AIM2 also nucleates a multiprotein PANoptosome integrating pyrin and ZBP1 sensing during infection.","evidence":"Co-IP, ubiquitination/proteasome assays, AIM2-ASC and DNA-binding assays, and reciprocal Co-IP plus KO mice in HSV-1/F. novicida infection","pmids":["34470856","34471287"],"confidence":"High","gaps":["E3 ligase opposing USP21 in this context not identified","Stoichiometry and order of PANoptosome assembly not resolved"]},{"year":2021,"claim":"Linked endogenous DNA-damage/replication-stress sensing by AIM2 to disease pathology, including JAK2V617F clonal-hematopoiesis-driven atherosclerosis, and uncovered transcriptional and nuclear-chromatin roles.","evidence":"Jak2VF macrophage expression with AIM2/caspase-1-11/GSDMD KO mice and scRNA-seq; STAT3 ChIP on AIM2 promoter and AIM2-EB1 Co-IP; ALR-KO chromatin-binding and DNA-repair assays","pmids":["33731931","34489308","34658166"],"confidence":"High","gaps":["How nuclear AIM2 interferes with chromatin decompaction mechanistically unclear","Direct vs scaffold role of AIM2-EB1 in migration not structurally resolved"]},{"year":2023,"claim":"Resolved the biophysical basis of AIM2 specificity and the ubiquitin code controlling its turnover — dsDNA-length-dependent filament assembly via primary and secondary nucleation gates ASC polymerization, and K63-ubiquitination of ASC (controlled by USP50) routes the AIM2-ASC complex to p62 autophagy.","evidence":"in vitro reconstitution, cryo-EM, single-molecule optical-trap kinetics, DARTS, and site-directed mutagenesis of ASC K158/161 and USP50 Cys53","pmids":["36864667","38042863","37647255"],"confidence":"High","gaps":["How filament geometry templates ASC nucleation structurally undefined","In vivo relevance of single-molecule kinetics not established"]},{"year":2023,"claim":"Mapped further inflammasome-independent disease roles — TRIM11-driven autophagic degradation of AIM2 tunes Treg differentiation in EAE, EIF2AK2-driven AIM2 upregulation activates PANoptosis in septic AKI, and AIM2 suppresses ferroptosis via FOXO3a-ACSL4.","evidence":"Co-IP, ubiquitination assays, AIM2-/TRIM11-/- mice in EAE, CLP model with knockdowns, and FOXO3a/ACSL4/ferroptosis assays","pmids":["37804507","39311631","36923928"],"confidence":"Medium","gaps":["Whether EIF2AK2 directly stabilizes vs transcriptionally induces AIM2 not separated","Generality of ferroptosis suppression beyond RCC untested"]},{"year":2024,"claim":"Reinforced a mitochondrial, autophagy-modulating, inflammasome-independent function in which AIM2 dampens JNK/ERK signaling and oxidative stress to protect against drug-induced liver injury.","evidence":"AIM2-KO mice, hepatocyte overexpression, mitochondrial localization, autophagy and JNK/ERK phospho-assays, rapamycin treatment","pmids":["38429284"],"confidence":"Medium","gaps":["Molecular partner at mitochondria not identified","Single-lab finding without reciprocal validation"]},{"year":null,"claim":"How AIM2 physically toggles between its canonical DNA-sensing inflammasome state and its diverse cytosolic, nuclear, and mitochondrial inflammasome-independent activities — and what determines this partitioning in a given cell — remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model linking DNA-bound filaments to non-inflammasome scaffolding","Subcellular targeting signals directing AIM2 to nucleus vs mitochondria unknown","Direct vs indirect engagement of AKT/mTOR/IRF3 axes not consistently demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,19,20]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[19]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,4,6]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,8,9,18]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,24]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[24]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[11,29]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,12,17]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,10,12,22]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,21,23,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9,18,27]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4,24]}],"complexes":["AIM2 inflammasome (AIM2-ASC-caspase-1)","PANoptosome (AIM2-pyrin-ZBP1-ASC-caspase-1/8-RIPK1/3-FADD)","AIM2-RACK1-PP2A complex"],"partners":["ASC/PYCARD","CASP8","TRIM11","USP21","IFI205","RACK1","EB1","MFN2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14862","full_name":"Interferon-inducible protein AIM2","aliases":["Absent in melanoma 2"],"length_aa":343,"mass_kda":39.0,"function":"Sensor component of the AIM2 inflammasome, which mediates inflammasome activation in response to the presence of double-stranded DNA (dsDNA) in the cytosol, leading to subsequent pyroptosis (PubMed:17726700, PubMed:19158675, PubMed:19158676, PubMed:19158679, PubMed:20566831, PubMed:23530044, PubMed:26197926, PubMed:26583071, PubMed:29440442, PubMed:33980849, PubMed:37364111). Inflammasomes are supramolecular complexes that assemble in the cytosol in response to pathogens and other damage-associated signals and play critical roles in innate immunity and inflammation (PubMed:17726700, PubMed:19158675, PubMed:19158676, PubMed:19158679, PubMed:20566831, PubMed:26197926, PubMed:29440442, PubMed:33980849). Acts as a recognition receptor (PRR): specifically recognizes and binds dsDNA in the cytosol, and mediates the formation of the inflammasome polymeric complex composed of AIM2, CASP1 and PYCARD/ASC (PubMed:17726700, PubMed:19158675, PubMed:19158676, PubMed:19158679, PubMed:20566831, PubMed:26197926, PubMed:29440442, PubMed:33980849). Recruitment of pro-caspase-1 (proCASP1) to the AIM2 inflammasome promotes caspase-1 (CASP1) activation, which subsequently cleaves and activates inflammatory cytokines IL1B and IL18 and gasdermin-D (GSDMD), promoting cytokine secretion (PubMed:17726700, PubMed:19158675, PubMed:19158676, PubMed:19158679, PubMed:20566831). In some cells, CASP1 activation mediates cleavage and activation of GSDMD, triggering pyroptosis without promoting cytokine secretion (PubMed:19158675, PubMed:19158676). Detects cytosolic dsDNA of viral and bacterial origin in a non-sequence-specific manner (PubMed:17726700, PubMed:19158675, PubMed:19158676, PubMed:19158679, PubMed:20566831, PubMed:26197926, PubMed:26583071, PubMed:29440442, PubMed:33980849). Involved in the DNA damage response caused by acute ionizing radiation by mediating pyroptosis of intestinal epithelial cells and bone marrow cells in response to double-strand DNA breaks (By similarity). Mechanistically, AIM2 senses DNA damage in the nucleus to mediate inflammasome assembly and inflammatory cell death (By similarity). Also acts as a regulator of neurodevelopment via its role in the DNA damage response: acts by promoting neural cell death in response to DNA damage in the developing brain, thereby purging genetically compromised cells of the central nervous system (By similarity). Pyroptosis mediated by the AIM2 inflammasome in response to DNA damage is dependent on GSDMD without involving IL1B and IL18 cytokine secretion (By similarity). Also acts as a mediator of pyroptosis, necroptosis and apoptosis (PANoptosis), an integral part of host defense against pathogens, in response to bacterial infection (By similarity). Can also trigger PYCARD/ASC-dependent, caspase-1-independent cell death that involves caspase-8 (CASP8) (By similarity) Also acts as a tumor suppressor independently of its role in inflammatory response (PubMed:16432157). Able to suppress overt cell proliferation in enterocytes: restricts stem cell proliferation in the intestinal mucosa in an inflammasome-independent manner, contributing to a decrease in the likelihood of colorectal cancer development (By similarity). AIM2 suppresses cell proliferation by inhibiting phosphorylation of AKT1 at 'Ser-473', preventing AKT1 activation and AKT-mTOR signaling pathway (By similarity). Inhibits AKT1 phosphorylation both by inhibiting the activity of PRKDC/DNA-PK kinase and promoting dephosphorylation by PP2A phosphatase (By similarity). Also acts as a key regulator of regulatory T-cells (Treg) homeostasis by promoting their stability: acts by preventing AKT1 activation (By similarity). Its role in Treg homeostasis is important to restain autoimmune diseases (By similarity)","subcellular_location":"Cytoplasm; Inflammasome; Nucleus","url":"https://www.uniprot.org/uniprotkb/O14862/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AIM2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AIM2","total_profiled":1310},"omim":[{"mim_id":"620563","title":"UBIQUITIN-SPECIFIC PEPTIDASE 50; USP50","url":"https://www.omim.org/entry/620563"},{"mim_id":"617042","title":"GASDERMIN D; GSDMD","url":"https://www.omim.org/entry/617042"},{"mim_id":"612677","title":"PYRIN AND HIN DOMAIN FAMILY, MEMBER 1; PYHIN1","url":"https://www.omim.org/entry/612677"},{"mim_id":"608107","title":"MEFV INNATE IMMUNITY REGULATOR, PYRIN; MEFV","url":"https://www.omim.org/entry/608107"},{"mim_id":"606848","title":"NIMA-RELATED KINASE 7; NEK7","url":"https://www.omim.org/entry/606848"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":15.7},{"tissue":"lymphoid tissue","ntpm":48.0}],"url":"https://www.proteinatlas.org/search/AIM2"},"hgnc":{"alias_symbol":["PYHIN4"],"prev_symbol":[]},"alphafold":{"accession":"O14862","domains":[{"cath_id":"1.10.533.10","chopping":"2-93","consensus_level":"high","plddt":90.0259,"start":2,"end":93},{"cath_id":"2.40.50.140","chopping":"149-244","consensus_level":"high","plddt":93.4289,"start":149,"end":244},{"cath_id":"2.40.50.140","chopping":"250-338","consensus_level":"high","plddt":93.0125,"start":250,"end":338}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14862","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14862-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14862-F1-predicted_aligned_error_v6.png","plddt_mean":83.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AIM2","jax_strain_url":"https://www.jax.org/strain/search?query=AIM2"},"sequence":{"accession":"O14862","fasta_url":"https://rest.uniprot.org/uniprotkb/O14862.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14862/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14862"}},"corpus_meta":[{"pmid":"19158675","id":"PMC_19158675","title":"AIM2 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AIM2 revealed by single molecule analysis.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/38042863","citation_count":16,"is_preprint":false},{"pmid":"37499961","id":"PMC_37499961","title":"Overexpressed CD44 is associated with B-cell activation via the HA-CD44-AIM2 pathway in lupus B cells.","date":"2023","source":"Clinical immunology (Orlando, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/37499961","citation_count":16,"is_preprint":false},{"pmid":"32121297","id":"PMC_32121297","title":"DROSHA-Dependent miRNA and AIM2 Inflammasome Activation in Idiopathic Pulmonary Fibrosis.","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32121297","citation_count":15,"is_preprint":false},{"pmid":"39076969","id":"PMC_39076969","title":"The roles of AIM2 in neurodegenerative diseases: insights and therapeutic implications.","date":"2024","source":"Frontiers in 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30959045","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50274,"output_tokens":7438,"usd":0.131196,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16869,"output_tokens":5326,"usd":0.108747,"stage2_stop_reason":"end_turn"},"total_usd":0.239943,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"AIM2 HIN200 domain binds cytosolic dsDNA, while the AIM2 pyrin domain associates with ASC to activate both NF-κB and caspase-1; knockdown of AIM2 abrogates caspase-1 activation in response to cytoplasmic dsDNA and vaccinia virus, identifying AIM2 as a cytosolic DNA receptor that forms a caspase-1-activating inflammasome with ASC.\",\n      \"method\": \"siRNA knockdown, domain-mapping experiments (HIN200 DNA binding, pyrin-ASC association), NF-κB and caspase-1 activation assays in mouse and human cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal domain mapping, functional knockdown, replicated across mouse and human cells, two independent Nature papers simultaneously\",\n      \"pmids\": [\"19158675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AIM2 senses cytoplasmic DNA via its OB (oligonucleotide/oligosaccharide-binding) domain, interacts with ASC through its pyrin domain to activate caspase-1, induces ASC pyroptosome formation and pyroptotic cell death; AIM2 oligomerizes upon DNA stimulation; stable expression in HEK293T cells confers DNA responsiveness.\",\n      \"method\": \"siRNA knockdown in human and mouse macrophages, stable AIM2 expression in HEK293T cells, ASC pyroptosome formation assay, caspase-1 activation assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reconstitution in non-responsive cell line, knockdown with defined phenotypic readout, two orthogonal methods, independently replicated\",\n      \"pmids\": [\"19158676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AIM2 inflammasome activates both caspase-8 and caspase-1, leading to apoptotic and pyroptotic cell death; caspase-8 is the apical caspase in AIM2-dependent apoptosis (with little requirement for caspase-9); procaspase-8 localizes to ASC inflammasome specks and binds directly to the pyrin domain of ASC.\",\n      \"method\": \"Gene knockdown, live-cell imaging, co-immunoprecipitation, immunofluorescence localization of caspase-8 to ASC specks\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown by Co-IP, localization confirmed by imaging, knockdown with defined cell death phenotype, two orthogonal methods in one study\",\n      \"pmids\": [\"23645208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIM11 binds AIM2 via its PS domain, undergoes auto-polyubiquitination at K458, and recruits the autophagic cargo receptor p62, thereby delivering AIM2 to autophagosomes for selective autophagic degradation; this suppresses AIM2 inflammasome activation.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis (K458 ubiquitination site), autophagy assays, p62 pulldown, gene knockdown\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, site-directed mutagenesis, functional degradation assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"27498865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AIM2 senses radiation-induced DNA damage in the nucleus to mediate caspase-1-dependent inflammasome activation and cell death; AIM2-deficient mice are protected from irradiation-induced gastrointestinal syndrome and hematopoietic failure.\",\n      \"method\": \"AIM2-knockout mice, irradiation model, nuclear localization studies, caspase-1 activation assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined mechanistic phenotype, nuclear DNA damage sensing demonstrated, replicated in two tissue systems\",\n      \"pmids\": [\"27846608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PKM2-mediated aerobic glycolysis promotes AIM2 inflammasome activation by modulating EIF2AK2 phosphorylation in macrophages; pharmacological and genetic inhibition of PKM2 or EIF2AK2 attenuates AIM2 inflammasome activation.\",\n      \"method\": \"PKM2 knockout (myeloid-conditional), EIF2AK2 pharmacological and genetic inhibition, inflammasome activation assays (IL-1β, IL-18 secretion), phosphorylation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO and pharmacological inhibition, EIF2AK2 phosphorylation mechanistic link, multiple orthogonal approaches\",\n      \"pmids\": [\"27779186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cholesterol-25-hydroxylase (Ch25h) produces 25-hydroxycholesterol (25-HC) to repress SREBP2 and cholesterol synthesis; increased macrophage cholesterol content triggers AIM2-dependent IL-1β release independently of crystals; Ch25h deficiency leads to mitochondrial DNA release into the cytosol which activates AIM2; AIM2 deficiency rescues the increased inflammasome activity in Ch25h-/- macrophages.\",\n      \"method\": \"Ch25h-/- and AIM2-/- genetic mouse models, cholesterol loading experiments, mitochondrial DNA cytosolic release assay, IL-1β secretion assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double KO epistasis, defined molecular pathway from cholesterol to mtDNA release to AIM2 activation, multiple genetic models\",\n      \"pmids\": [\"29033131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AIM2 antagonizes mouse ALR IFI205-mediated interferon induction activity by sequestering IFI205 from STING, thus negatively regulating the cytosolic DNA-triggered type I IFN response.\",\n      \"method\": \"ALR overexpression and knockdown experiments, IFN induction assays, co-immunoprecipitation showing AIM2-IFI205 interaction\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP/sequestration assay, functional IFN induction assay, single lab but two orthogonal readouts\",\n      \"pmids\": [\"28679751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AIM2 interacts with the RACK1-PP2A phosphatase complex in T regulatory cells to restrain AKT phosphorylation, attenuating mTOR and MYC signaling and glycolysis while promoting oxidative phosphorylation; this inflammasome-independent function promotes Treg cell stability.\",\n      \"method\": \"RNA-seq, biochemical co-immunoprecipitation (AIM2-RACK1-PP2A complex), metabolic assays (glycolysis/OXPHOS), AIM2-conditional KO in T cells, lineage tracing\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identifying AIM2-RACK1-PP2A complex, metabolic functional assays, T cell-conditional KO, multiple orthogonal methods\",\n      \"pmids\": [\"33505023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AIM2 negatively regulates the DNA-PK–AKT3 signaling axis in microglia in an inflammasome-independent manner, thereby controlling cGAS- and DNA-PK-synergistically induced neuroinflammation during experimental autoimmune encephalomyelitis.\",\n      \"method\": \"AIM2-/- mice, microglial-specific analysis, DNA-PK inhibitor treatment, AKT3 phosphorylation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined pathway placement, pharmacological confirmation with DNA-PK inhibitor, single lab\",\n      \"pmids\": [\"33710283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AIM2 inflammasome contributes to CNS homeostasis by regulating gasdermin-D-dependent pyroptosis (not IL-1/IL-18 cytokine production) to remove genetically compromised cells during neurodevelopment; AIM2 deficiency results in decreased neural cell death and excessive accumulation of DNA-damaged neurons in the adult brain.\",\n      \"method\": \"AIM2-knockout mice, gasdermin-D-knockout mice, DNA damage-inducing agents, cell death quantification, behavioral analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO genetic models, GSDMD-specific pathway placement distinguishing from IL-1/IL-18 axis, multiple phenotypic readouts\",\n      \"pmids\": [\"32350463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AIM2 colocalized with mitochondria in NSCLC cells; AIM2 knockdown leads to MFN2 upregulation, enhanced mitochondrial fusion, decreased ROS production, and inactivation of MAPK/ERK signaling, reducing tumor cell proliferation independent of inflammasome activation.\",\n      \"method\": \"AIM2 knockdown/overexpression, mitochondrial colocalization (fluorescence), MFN2 protein analysis, ROS measurement, MAPK/ERK pathway assays, xenograft in vivo model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — colocalization by imaging, MFN2 functional link, pathway analysis in vitro and in vivo, but mechanistic details limited to single lab\",\n      \"pmids\": [\"32005973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 forms a large multi-protein PANoptosome complex with pyrin, ZBP1, ASC, caspase-1, caspase-8, RIPK3, RIPK1 and FADD to drive PANoptosis; AIM2 regulates pyrin and ZBP1 innate immune sensors during HSV-1 and Francisella novicida infection.\",\n      \"method\": \"Co-immunoprecipitation of multi-protein complex, AIM2/pyrin/ZBP1 knockout mice, cell death assays, infection models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP demonstrating multi-protein complex assembly, multiple genetic KOs, defined functional consequence in infection\",\n      \"pmids\": [\"34471287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP21 deubiquitinase binds to AIM2 upon DNA stimulation and deubiquitinates it, increasing AIM2 protein stability; in resting macrophages AIM2 is constitutively ubiquitinated and undergoes proteasomal degradation; USP21-mediated deubiquitination is required for AIM2-ASC complex assembly (but does not affect AIM2 DNA-binding ability).\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, proteasome inhibition, USP21 knockdown, AIM2-ASC complex formation assay, DNA-binding assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination/deubiquitination biochemical assay, functional dissection of DNA-binding vs. complex assembly, multiple orthogonal methods\",\n      \"pmids\": [\"34470856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAT3, activated by IL-11 cytokine signaling, transcriptionally upregulates AIM2 in gastric tumor epithelium; AIM2 physically interacts with microtubule end-binding protein EB1 to promote epithelial cell migration and tumourigenesis independent of inflammasome activity.\",\n      \"method\": \"ChIP (STAT3 binding to AIM2 promoter), Co-immunoprecipitation (AIM2-EB1 interaction), genetic AIM2 targeting in gp130F/F mouse model, xenograft, in vitro migration assays\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming STAT3-AIM2 transcriptional regulation, Co-IP of AIM2-EB1 complex, in vivo mouse model with genetic manipulation, multiple orthogonal methods\",\n      \"pmids\": [\"34489308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 deficiency in B cells leads to increased Blimp-1 expression and reduced Bcl-6 expression, regulating B-cell differentiation; AIM2 acts upstream of the Blimp-1–Bcl-6 axis (silencing Blimp-1 or Bcl-6 had no effect on AIM2 expression); IL-10 upregulates AIM2 expression via DNA demethylation.\",\n      \"method\": \"B cell-conditional AIM2 knockout mice, Western blot/qPCR for Blimp-1 and Bcl-6, siRNA knockdown of Blimp-1/Bcl-6, DNA methylation analysis\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO, epistasis experiment placing AIM2 upstream of Blimp-1/Bcl-6, epigenetic regulation assay, single lab\",\n      \"pmids\": [\"34521812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 inflammasome activation in JAK2V617F macrophages is driven by oxidative DNA damage and DNA replication stress; Aim2 deficiency reduces atherosclerosis in clonal haematopoiesis models; deletion of caspase-1/11, gasdermin D, or AIM2 reverses adverse atherosclerotic changes.\",\n      \"method\": \"Jak2VF selective macrophage expression, Aim2-/- mice, caspase-1/11-/- and gasdermin D-/- mice, atherosclerosis quantification, DNA damage markers, scRNA-seq\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent genetic KO models, epistasis placing AIM2 downstream of replication stress/DNA damage, replicated phenotype\",\n      \"pmids\": [\"33731931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AIM2 inhibits STING-dependent selective autophagy and IFN-β secretion during M. bovis infection by competitively binding cytosolic mycobacterial DNA, thereby restricting STING-TBK1-dependent pathway activation.\",\n      \"method\": \"AIM2 knockdown/overexpression in macrophages, autophagy assays, STING pathway analysis, IFN-β secretion measurement\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional pathway placement by knockdown, STING-TBK1 pathway assays, single lab but two orthogonal readouts (autophagy and IFN-β)\",\n      \"pmids\": [\"27409673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In microglia, AIM2 reduces cGAS-mediated antiviral inflammation by inhibiting AKT-IRF3 phosphorylation in an inflammasome-independent manner; microglial AIM2 deficiency exacerbates both MPTP-induced and transgenic PD models.\",\n      \"method\": \"AIM2-/- and bone marrow chimeric mice, MPTP model, RNA-sequencing, primary microglial transfection, AKT-IRF3 phosphorylation assays\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO, chimeric mice for cell-type specificity, mechanistic phosphorylation analysis, single lab\",\n      \"pmids\": [\"35959803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AIM2 filament assembly on dsDNA is essential for nucleic acid specificity: AIM2 binds various nucleic acids but preferentially assembles ordered filaments on dsDNA in a duplex length-dependent manner; only filaments assembled on dsDNA induce downstream ASC polymerization; oligomers on other nucleic acids fail to trigger ASC polymerization.\",\n      \"method\": \"In vitro biochemical filament assembly assays, cryo-EM structural analysis, ASC polymerization assays with different nucleic acid substrates\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple nucleic acid substrates, structural analysis, functional ASC polymerization readout, single lab but rigorous mechanistic study\",\n      \"pmids\": [\"36864667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AIM2 assembly on dsDNA proceeds via two distinct mechanisms resembling primary nucleation (incoming AIM2 binds adjacent dsDNA) and secondary nucleation (incoming AIM2 directly contacts DNA-bound AIM2 assemblies); oligomer size can increase fourfold in seconds; single AIM2 molecules do not diffuse/scan along DNA.\",\n      \"method\": \"Single-molecule optical trap + confocal fluorescence microscopy, kinetic rate measurements of association and dissociation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule reconstitution with direct kinetic measurement, two distinct mechanistic pathways identified, rigorous quantitative method\",\n      \"pmids\": [\"38042863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pristimerin enhances K63-linked ubiquitin chains on PYCARD/ASC at K158/161 by binding the Cys53 site of deubiquitinase USP50, blocking USP50-mediated removal of these chains; the K63-ubiquitinated PYCARD/ASC serves as recognition signal for SQSTM1/p62-mediated autophagic degradation of the AIM2-PYCARD/ASC complex.\",\n      \"method\": \"Drug affinity responsive target stability (DARTS) assay, site-directed mutagenesis (Cys53, K158/161), Co-IP, ubiquitination assays, autophagy assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — DARTS binding assay, mutagenesis of ubiquitination sites and USP50 binding site, Co-IP, multiple orthogonal biochemical methods\",\n      \"pmids\": [\"37647255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EIF2AK2 directly targets AIM2 protein (shown by Co-IP) and positively regulates AIM2 expression, thereby upregulating AIM2 to activate PANoptosis in septic AKI.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of EIF2AK2 and AIM2, LDH cytotoxicity assay, CLP mouse model\",\n      \"journal\": \"Renal failure\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP showing direct binding, functional knockdown, single lab with two orthogonal methods\",\n      \"pmids\": [\"39311631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM11 promotes selective autophagic degradation of AIM2 by inducing AIM2 ubiquitination and p62 binding in CD4+ T cells, attenuating Treg cell differentiation; AIM2 attenuates AKT and FOXO1 phosphorylation, MYC signaling, and glycolysis to promote Treg stability in this context.\",\n      \"method\": \"Co-immunoprecipitation (TRIM11-AIM2 interaction), ubiquitination assays, AIM2-/- and TRIM11-/- mice in EAE model, metabolic assays, T cell differentiation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination biochemistry, genetic KO models, multiple functional readouts, mechanistically extends published AIM2-RACK1-PP2A finding\",\n      \"pmids\": [\"37804507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nuclear AIM2-like receptors (ALRs) bind to chromatin and interfere with chromatin decompaction required for DNA repair, thereby inhibiting DNA repair and accelerating genome destabilization, micronuclei generation, and cell death; this function is uncoupled from their role in innate immunity/inflammasome.\",\n      \"method\": \"ALR-knockout mice, irradiation-induced bone marrow injury model, chromatin binding assays, DNA repair assays, micronuclei quantification\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ALR-KO genetic model, chromatin binding assay, functional DNA repair readout, single lab but novel subcellular mechanism\",\n      \"pmids\": [\"34658166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HMGB1-DNA complex initially induces AIM2-dependent inflammasome activation and IL-1β release via RAGE; subsequently HMGB1-DNA complex triggers ATG5-dependent autophagy through RAGE, which functions as a negative feedback to limit AIM2 inflammasome activation.\",\n      \"method\": \"RAGE-blocking experiments, ATG5 knockdown, AIM2 inflammasome activation assays, IL-1β ELISA, autophagy assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — RAGE-dependent pathway placement by blocking, ATG5 knockdown epistasis, single lab with two orthogonal readouts\",\n      \"pmids\": [\"24971542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AIM2 promotes FOXO3a phosphorylation and proteasome-mediated degradation, reducing FOXO3a transcriptional activation of ACSL4, thereby inhibiting ferroptosis to promote renal cell carcinoma progression in an inflammasome-independent manner.\",\n      \"method\": \"AIM2 knockdown/overexpression in RCC cells, FOXO3a phosphorylation and degradation assays, ACSL4 expression analysis, ferroptosis assays\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional pathway dissection with KD/OE, FOXO3a-ACSL4 axis mechanistically defined, single lab\",\n      \"pmids\": [\"36923928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AIM2 inhibits colorectal cancer cell proliferation and migration through Gli1 suppression via a Smoothened-independent pathway, and regulates the AKT/mTOR/Gli1 signaling axis; AKT inhibition reverses increased Gli1 and EMT induced by AIM2 depletion.\",\n      \"method\": \"AIM2 knockdown/overexpression, Gli1 expression analysis, AKT inhibitor (Ly294002) treatment, proliferation/migration assays, Western blot\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional pathway placement by epistasis with AKT inhibitor, single lab, KD/OE with defined phenotypic readout\",\n      \"pmids\": [\"33291082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AIM2 and IFI16 bind neutrophil extracellular traps (NETs) in vitro and in SLE renal tissues; ALR binding causes NETs to resist degradation by DNase I, suggesting extracellular ALR-NET interactions may promote sustained IFN signaling.\",\n      \"method\": \"Immunoprecipitation (autoantibody detection), immunofluorescence of ALR-NET binding, DNase I protection assay, confocal microscopy of SLE renal tissue\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct binding shown by immunofluorescence, functional DNase resistance assay, in vivo tissue confirmation, single lab\",\n      \"pmids\": [\"35608258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AIM2 localizes to mitochondria in mouse hepatocytes; overexpression amplifies autophagy while dampening JNK phosphorylation; AIM2 deficiency in aged mice exacerbates APAP-induced liver injury by increasing oxidative stress and augmenting JNK/ERK phosphorylation, independent of inflammasome activation.\",\n      \"method\": \"AIM2-KO mice, AIM2 overexpression in hepatocytes, mitochondrial localization assay, autophagy assays, JNK/ERK phosphorylation analysis, rapamycin treatment\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mitochondrial localization demonstrated, genetic KO with pharmacological rescue, multiple pathway readouts, single lab\",\n      \"pmids\": [\"38429284\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AIM2 is a cytosolic dsDNA sensor whose HIN200/OB domain binds dsDNA (with length-dependent filament assembly providing nucleic acid specificity), and whose N-terminal pyrin domain recruits ASC via PYD-PYD interactions to nucleate ASC filaments and activate caspase-1, driving IL-1β/IL-18 maturation and gasdermin-D-dependent pyroptosis; AIM2 ubiquitination status is controlled by the TRIM11 E3 ligase and USP21 deubiquitinase to regulate its stability and ASC complex assembly, while p62-mediated selective autophagy degrades the AIM2-ASC complex; beyond canonical inflammasome activity, AIM2 exerts inflammasome-independent functions including sequestering IFI205/STING to modulate type I IFN responses, inhibiting DNA-PK–AKT3 and cGAS-AKT-IRF3 signaling in microglia, interacting with the RACK1-PP2A complex to restrain AKT-mTOR signaling in Treg cells, binding EB1 to promote cell migration, inhibiting DNA repair by interfering with chromatin decompaction in the nucleus, and regulating mitochondrial dynamics via MFN2.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AIM2 is a cytosolic double-stranded DNA sensor that nucleates a caspase-1-activating inflammasome, coupling detection of aberrant DNA to inflammatory cell death [#0, #1]. It binds dsDNA through its HIN200/OB domain and engages ASC through its N-terminal pyrin domain, oligomerizing upon DNA stimulation to drive ASC pyroptosome formation, caspase-1 activation, and pyroptotic death [#0, #1]. Nucleic-acid specificity arises from filament assembly: AIM2 binds diverse nucleic acids but preferentially forms ordered filaments on dsDNA in a duplex-length-dependent manner, and only dsDNA-templated filaments — built through primary and secondary nucleation rather than diffusive scanning — trigger downstream ASC polymerization [#19, #20]. Beyond IL-1β/IL-18 maturation, AIM2 sensing of nuclear radiation-induced DNA damage and of cytosolic mitochondrial or replication-stress DNA links genotoxic and metabolic stress to inflammasome-driven tissue pathology, and a gasdermin-D-dependent pyroptotic arm clears DNA-damaged cells during neurodevelopment without cytokine output [#4, #6, #16, #10]. The inflammasome also expands into larger death-signaling assemblies, recruiting caspase-8 and forming a multiprotein PANoptosome with pyrin, ZBP1, RIPK1/3, FADD and caspase-1/8 to drive PANoptosis during infection [#2, #12]. AIM2 abundance and complex assembly are gated by ubiquitination: TRIM11 ubiquitinates AIM2 and recruits p62 for selective autophagic degradation, USP21 deubiquitinates AIM2 upon DNA stimulation to stabilize it and permit AIM2–ASC assembly, and K63-ubiquitination of ASC marks the AIM2–ASC complex for p62-mediated autophagy [#3, #13, #21]. AIM2 additionally performs inflammasome-independent functions across cell types — restraining type I IFN signaling by sequestering IFI205 from STING and by inhibiting cGAS/DNA-PK–AKT–IRF3 axes in microglia [#7, #9, #18], binding the RACK1–PP2A complex to suppress AKT–mTOR signaling and stabilize Treg cells [#8], binding the microtubule end-binding protein EB1 to promote epithelial migration and tumorigenesis [#14], and modulating mitochondrial dynamics via MFN2 [#11].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established the core identity of AIM2 as the missing cytosolic DNA receptor that converts dsDNA detection into caspase-1 activation, defining a domain logic (DNA-binding HIN200/OB plus ASC-engaging pyrin) for the inflammasome.\",\n      \"evidence\": \"siRNA knockdown and domain-mapping in mouse/human cells plus reconstitution in non-responsive HEK293T, with caspase-1 and ASC pyroptosome readouts\",\n      \"pmids\": [\"19158675\", \"19158676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic basis of DNA-binding specificity not yet resolved\", \"How oligomerization nucleates ASC was not mechanistically defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed the AIM2 inflammasome is not solely pyroptotic — it recruits caspase-8 as an apical caspase to also drive apoptosis, broadening its death-signaling repertoire.\",\n      \"evidence\": \"knockdown, live-cell imaging, Co-IP, and immunofluorescence of caspase-8 at ASC specks\",\n      \"pmids\": [\"23645208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants choosing apoptotic vs pyroptotic outcome unclear\", \"Direct caspase-8 binding to ASC PYD not structurally defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined post-translational and metabolic control of AIM2: TRIM11/p62 autophagic degradation limits activation, while PKM2-driven glycolysis and EIF2AK2 phosphorylation promote it, and STING-pathway competition links AIM2 to IFN restriction.\",\n      \"evidence\": \"Co-IP, K458 mutagenesis, autophagy/p62 assays, conditional PKM2 KO, EIF2AK2 inhibition, and macrophage STING/IFN assays\",\n      \"pmids\": [\"27498865\", \"27779186\", \"27409673\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin linkage type on AIM2 not specified\", \"How glycolytic flux mechanistically gates inflammasome assembly unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated AIM2 senses DNA damage in the nucleus and cholesterol-driven mtDNA release in cytosol, expanding its triggers from foreign DNA to endogenous genotoxic and metabolic stress with defined in vivo pathology.\",\n      \"evidence\": \"AIM2-KO and Ch25h-KO mice, irradiation and cholesterol-loading models, mtDNA cytosolic release and IL-1β assays\",\n      \"pmids\": [\"27846608\", \"29033131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nuclear AIM2 accesses damaged DNA mechanistically unclear\", \"Whether the same filament mechanism operates on endogenous DNA not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed an inflammasome-independent role in restraining type I IFN by sequestering the ALR IFI205 away from STING, positioning AIM2 as a negative regulator of cytosolic DNA-triggered IFN.\",\n      \"evidence\": \"ALR overexpression/knockdown, IFN induction assays, and AIM2-IFI205 Co-IP\",\n      \"pmids\": [\"28679751\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP without reciprocal structural validation\", \"Human relevance of mouse IFI205 axis untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended AIM2's inflammasome-independent functions into adaptive and neural contexts — restraining AKT-mTOR via RACK1-PP2A in Treg cells, suppressing DNA-PK-AKT3 and cGAS-AKT-IRF3 signaling in microglia, and modulating MFN2-dependent mitochondrial dynamics in tumor cells.\",\n      \"evidence\": \"T-cell- and microglia-conditional/KO mice, Co-IP of AIM2-RACK1-PP2A, AKT3/IRF3 phospho-assays, MFN2/ROS and MAPK readouts in NSCLC with xenografts\",\n      \"pmids\": [\"33505023\", \"33710283\", \"32005973\", \"35959803\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect engagement of these kinase axes not always resolved\", \"How a DNA sensor relocalizes to mitochondria or cytosolic scaffolds unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed the AIM2 inflammasome contributes to CNS homeostasis via a gasdermin-D-dependent pyroptotic arm that clears DNA-damaged neurons during development, dissociating cell-death function from IL-1/IL-18 cytokine output.\",\n      \"evidence\": \"AIM2-KO and GSDMD-KO mice, DNA-damage agents, cell-death quantification, and behavioral analysis\",\n      \"pmids\": [\"32350463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger for developmental AIM2 activation not defined\", \"Why cytokine output is bypassed mechanistically unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined ubiquitin-switch and complex-assembly control: USP21 deubiquitinates AIM2 upon DNA sensing to stabilize it and enable AIM2-ASC assembly without affecting DNA binding; AIM2 also nucleates a multiprotein PANoptosome integrating pyrin and ZBP1 sensing during infection.\",\n      \"evidence\": \"Co-IP, ubiquitination/proteasome assays, AIM2-ASC and DNA-binding assays, and reciprocal Co-IP plus KO mice in HSV-1/F. novicida infection\",\n      \"pmids\": [\"34470856\", \"34471287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase opposing USP21 in this context not identified\", \"Stoichiometry and order of PANoptosome assembly not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked endogenous DNA-damage/replication-stress sensing by AIM2 to disease pathology, including JAK2V617F clonal-hematopoiesis-driven atherosclerosis, and uncovered transcriptional and nuclear-chromatin roles.\",\n      \"evidence\": \"Jak2VF macrophage expression with AIM2/caspase-1-11/GSDMD KO mice and scRNA-seq; STAT3 ChIP on AIM2 promoter and AIM2-EB1 Co-IP; ALR-KO chromatin-binding and DNA-repair assays\",\n      \"pmids\": [\"33731931\", \"34489308\", \"34658166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nuclear AIM2 interferes with chromatin decompaction mechanistically unclear\", \"Direct vs scaffold role of AIM2-EB1 in migration not structurally resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolved the biophysical basis of AIM2 specificity and the ubiquitin code controlling its turnover — dsDNA-length-dependent filament assembly via primary and secondary nucleation gates ASC polymerization, and K63-ubiquitination of ASC (controlled by USP50) routes the AIM2-ASC complex to p62 autophagy.\",\n      \"evidence\": \"in vitro reconstitution, cryo-EM, single-molecule optical-trap kinetics, DARTS, and site-directed mutagenesis of ASC K158/161 and USP50 Cys53\",\n      \"pmids\": [\"36864667\", \"38042863\", \"37647255\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How filament geometry templates ASC nucleation structurally undefined\", \"In vivo relevance of single-molecule kinetics not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapped further inflammasome-independent disease roles — TRIM11-driven autophagic degradation of AIM2 tunes Treg differentiation in EAE, EIF2AK2-driven AIM2 upregulation activates PANoptosis in septic AKI, and AIM2 suppresses ferroptosis via FOXO3a-ACSL4.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, AIM2-/TRIM11-/- mice in EAE, CLP model with knockdowns, and FOXO3a/ACSL4/ferroptosis assays\",\n      \"pmids\": [\"37804507\", \"39311631\", \"36923928\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether EIF2AK2 directly stabilizes vs transcriptionally induces AIM2 not separated\", \"Generality of ferroptosis suppression beyond RCC untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reinforced a mitochondrial, autophagy-modulating, inflammasome-independent function in which AIM2 dampens JNK/ERK signaling and oxidative stress to protect against drug-induced liver injury.\",\n      \"evidence\": \"AIM2-KO mice, hepatocyte overexpression, mitochondrial localization, autophagy and JNK/ERK phospho-assays, rapamycin treatment\",\n      \"pmids\": [\"38429284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular partner at mitochondria not identified\", \"Single-lab finding without reciprocal validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AIM2 physically toggles between its canonical DNA-sensing inflammasome state and its diverse cytosolic, nuclear, and mitochondrial inflammasome-independent activities — and what determines this partitioning in a given cell — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model linking DNA-bound filaments to non-inflammasome scaffolding\", \"Subcellular targeting signals directing AIM2 to nucleus vs mitochondria unknown\", \"Direct vs indirect engagement of AKT/mTOR/IRF3 axes not consistently demonstrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 19, 20]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 4, 6]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 8, 9, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 24]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [11, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 12, 17]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 10, 12, 22]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 21, 23, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9, 18, 27]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4, 24]}\n    ],\n    \"complexes\": [\n      \"AIM2 inflammasome (AIM2-ASC-caspase-1)\",\n      \"PANoptosome (AIM2-pyrin-ZBP1-ASC-caspase-1/8-RIPK1/3-FADD)\",\n      \"AIM2-RACK1-PP2A complex\"\n    ],\n    \"partners\": [\n      \"ASC/PYCARD\",\n      \"CASP8\",\n      \"TRIM11\",\n      \"USP21\",\n      \"IFI205\",\n      \"RACK1\",\n      \"EB1\",\n      \"MFN2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}