{"gene":"AIM2","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2009,"finding":"AIM2 HIN200 domain binds cytosolic dsDNA, while its pyrin domain associates with the adaptor ASC to activate caspase-1 and NF-κB; knockdown of Aim2 abrogates caspase-1 activation in response to cytoplasmic dsDNA and vaccinia virus, establishing AIM2 as a cytosolic DNA receptor that forms a caspase-1-activating inflammasome with ASC.","method":"Knockdown experiments in mouse and human cells, domain-function mapping (HIN200 vs. pyrin domain), caspase-1 activity assays, NF-κB reporter assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — original discovery with domain mutagenesis, genetic knockdown, and multiple functional readouts; foundational paper with >2000 citations replicated widely","pmids":["19158675"],"is_preprint":false},{"year":2013,"finding":"AIM2 and NLRP3 inflammasomes activate both caspase-1 (pyroptosis) and caspase-8 (apoptosis) via ASC; procaspase-8 localizes to ASC inflammasome specks and binds directly to the pyrin domain of ASC, making caspase-8 an integral inflammasome component.","method":"Gene knockdown, live-cell imaging, co-localization of procaspase-8 with ASC specks, direct binding assay (pyrin domain of ASC), pyroptosis vs. apoptosis quantification at varying DNA concentrations","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (knockdown, direct binding, imaging), replicated mechanistic finding","pmids":["23645208"],"is_preprint":false},{"year":2015,"finding":"In resting cells, AIM2 physically interacts with and limits activation of DNA-dependent protein kinase (DNA-PK), a PI3K-related kinase that promotes Akt phosphorylation; loss of AIM2 promotes DNA-PK-mediated Akt activation to enhance tumor growth, independent of inflammasome activation.","method":"Co-immunoprecipitation, Aim2-/- and Asc-/- mouse tumor models (AOM/DSS and APC-Min), Akt inhibitor rescue, bone-marrow chimera studies","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, multiple genetic mouse models, pharmacologic rescue; single lab but multiple orthogonal methods","pmids":["26107252"],"is_preprint":false},{"year":2016,"finding":"TRIM11 binds AIM2 via its PS domain and undergoes auto-polyubiquitination at K458, promoting association with the autophagic cargo receptor p62 to mediate AIM2 degradation via selective autophagy, thereby suppressing AIM2 inflammasome activation.","method":"Co-immunoprecipitation, ubiquitination assays, site-directed mutagenesis (K458), siRNA knockdown, autophagy flux assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical reconstitution of ubiquitination, mutagenesis, and autophagy assays in single study with multiple orthogonal approaches","pmids":["27498865"],"is_preprint":false},{"year":2016,"finding":"PKM2-mediated glycolysis promotes AIM2 inflammasome activation through EIF2AK2 phosphorylation in macrophages; pharmacological or genetic inhibition of PKM2 or EIF2AK2 attenuates AIM2 inflammasome activation and IL-1β/IL-18 release.","method":"PKM2 conditional knockout in myeloid cells, pharmacologic inhibition, EIF2AK2 knockdown, IL-1β/IL-18 ELISA, in vivo sepsis models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout plus pharmacologic inhibition with defined pathway placement and in vivo validation","pmids":["27779186"],"is_preprint":false},{"year":2017,"finding":"25-hydroxycholesterol (25-HC) produced by macrophage cholesterol-25-hydroxylase (Ch25h) prevents AIM2 inflammasome activation; Ch25h deficiency causes cholesterol accumulation, which reduces mitochondrial respiratory capacity and releases mitochondrial DNA into the cytosol to activate AIM2; AIM2 deficiency rescues the increased inflammasome activity of Ch25h-/- macrophages.","method":"Ch25h-/- and Aim2-/- macrophages, mitochondrial function assays, cytosolic mtDNA quantification, IL-1β secretion assays, genetic epistasis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis (double KO rescue), multiple mechanistic readouts, published in high-impact journal","pmids":["29033131"],"is_preprint":false},{"year":2017,"finding":"HCMV tegument protein pUL83 directly interacts with AIM2 in the cytoplasm during early infection; the pUL83/AIM2 interaction reduces expression and activation of AIM2 inflammasome-associated proteins, constituting a viral immune evasion mechanism.","method":"Co-immunoprecipitation, yeast two-hybrid, immunofluorescence co-localization, reconstituted HEK293T inflammasome system with pUL83 expression","journal":"Virology journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP confirmed in infected macrophages and transfected cells; functional consequence shown in reconstituted system; single lab","pmids":["28219398"],"is_preprint":false},{"year":2017,"finding":"AIM2 inflammasome activation by influenza A virus (IAV) results from IAV-induced dsDNA release and caspase-1 activation in macrophages specifically; AIM2-deficient mice show attenuated lung injury with improved survival but unaltered viral burden and adaptive immunity, establishing a macrophage-specific AIM2 function in IAV-induced lung injury.","method":"Aim2-/- mice, AIM2-specific siRNA in human/mouse alveolar macrophages and type II cells, caspase-1 activation assays, in vivo influenza challenge","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined cellular phenotype, siRNA validation in primary human and mouse cells, in vivo model","pmids":["28424239"],"is_preprint":false},{"year":2018,"finding":"AIM2 inflammasome is activated in macrophages that engulf DNA from necrotic cells; DNA uptake occurs in large vacuolar structures within recruited macrophages; DNase I treatment attenuates IL-1β levels, confirming dsDNA as the principal DAMP; AIM2-dependent caspase-1 activation and ASC speck formation drive a proinflammatory phenotype contributing to CKD progression.","method":"Bone marrow chimera studies, intravital microscopy, Aim2-/- mice, in vitro macrophage engulfment assays with DNase I treatment, caspase-1 activity assays, ASC speck imaging","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vivo and in vitro approaches, bone marrow chimera genetic dissection, mechanistic DNase validation","pmids":["29439156"],"is_preprint":false},{"year":2019,"finding":"AIM2 antagonizes IFI205-mediated type I IFN induction by sequestering IFI205 away from STING, revealing AIM2 as a negative regulator of the interferon response to cytosolic retrotransposon DNA.","method":"Aim2-knockout macrophages, cGAMP measurement, STING aggregation assays, ALR-complementation experiments","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic KO with defined pathway placement; sequestration mechanism inferred from biochemical assays; single lab","pmids":["28679751"],"is_preprint":false},{"year":2016,"finding":"AIM2 deficiency in dendritic cells and macrophages leads to markedly higher IFN-β production in response to DNA via enhanced cGAMP generation, STING aggregation, and TBK1/IRF3 phosphorylation; AIM2-induced pyroptosis (caspase-1-dependent cell death) is a major mechanism suppressing STING pathway activation.","method":"AIM2-/-, ASC-/-, and caspase-1-/- cells, cGAMP measurement, STING aggregation assays, TBK1/IRF3 phosphorylation, caspase-1 inhibition","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic KO lines with mechanistic biochemical readouts; antagonistic pathway definitively placed","pmids":["26927800"],"is_preprint":false},{"year":2014,"finding":"HMGB1-DNA complex initially activates AIM2-dependent inflammasome and IL-1β release via RAGE receptor; subsequently, HMGB1-DNA triggers ATG5-dependent autophagy that limits AIM2 inflammasome activation, identifying autophagy as a negative counter-regulatory mechanism.","method":"RAGE-/- macrophages, ATG5 knockdown, IL-1β ELISA, inflammasome assembly assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — genetic knockouts with functional readouts; pathway placement established; single lab with limited orthogonal approaches","pmids":["24971542"],"is_preprint":false},{"year":2014,"finding":"End-binding protein 1 (EB1) is required for AIM2 inflammasome activation and links AIM2 inflammasomes to autophagy-dependent IL-1β secretion; AIM2 inflammasomes colocalize with microtubule organizing centers and autophagosomes; 5'-AMP activated protein kinase regulates EB1-mediated autophagy-based inflammasome-induced secretion.","method":"EB1 depletion, live-cell imaging (colocalization with MTOCs and autophagosomes), autophagy flux assays, IL-1β secretion assays, LC3-dependent secretion assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — EB1 depletion with imaging and functional readouts; single lab but multiple orthogonal methods","pmids":["25164813"],"is_preprint":false},{"year":2021,"finding":"AIM2 has an inflammasome-independent, T cell-intrinsic role in regulatory T (Treg) cells: AIM2 interacts with the RACK1-PP2A phosphatase complex to restrain AKT phosphorylation, attenuating mTOR and MYC signaling and glycolysis while promoting oxidative phosphorylation, thereby enhancing Treg cell stability.","method":"T cell-conditional AIM2 knockout, RNA sequencing, biochemical/metabolic analyses, Co-IP (AIM2-RACK1-PP2A complex), lineage-tracing, AKT phosphorylation assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — Co-IP of AIM2-RACK1-PP2A complex, conditional KO, metabolic and biochemical assays; multiple orthogonal methods in single study","pmids":["33505023"],"is_preprint":false},{"year":2021,"finding":"AIM2 forms a large multi-protein complex (PANoptosome) with pyrin and ZBP1, along with ASC, caspase-1, caspase-8, RIPK3, RIPK1, and FADD, to drive PANoptosis (simultaneous apoptosis, necroptosis, and pyroptosis) and host protection during HSV-1 and Francisella novicida infection.","method":"Co-immunoprecipitation of multi-protein complex, genetic knockouts (Aim2-/-, ZBP1-/-, Pyrin-/-), cell death assays (pyroptosis, apoptosis, necroptosis), in vivo infection models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP of the multi-protein complex, multiple genetic KOs with defined cell death phenotypes, in vivo validation","pmids":["34471287"],"is_preprint":false},{"year":2021,"finding":"TRIM11 promotes selective autophagic degradation of AIM2 in CD4+ T cells by inducing AIM2 ubiquitination and binding to p62, thereby negatively regulating Treg cell differentiation in an AIM2-dependent manner.","method":"Co-immunoprecipitation (TRIM11-AIM2 and p62 interaction), ubiquitination assays, TRIM11 knockdown/overexpression in CD4+ T cells, Treg differentiation assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP, ubiquitination assays, functional Treg assays; extends TRIM11-AIM2 mechanism to T cells; single lab","pmids":["37804507"],"is_preprint":false},{"year":2021,"finding":"USP21 deubiquitinase binds to AIM2 upon DNA stimulation and deubiquitinates it, increasing its protein stability and preventing proteasomal degradation; additionally, USP21-mediated deubiquitination is required for AIM2-ASC complex formation (inflammasome assembly) but does not affect AIM2's DNA-binding ability.","method":"Co-immunoprecipitation, deubiquitination assays, USP21 depletion, proteasome inhibition, DNA-binding assays, AIM2-ASC complex assembly assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical deubiquitination assays, multiple functional readouts (stability, complex assembly, DNA binding) dissected separately; single lab but multiple orthogonal methods","pmids":["34470856"],"is_preprint":false},{"year":2023,"finding":"AIM2 preferentially binds dsDNA over ssDNA, dsRNA, ssRNA, or DNA:RNA hybrids in a duplex length-dependent manner; AIM2 oligomers assembled on non-dsDNA substrates display less ordered filamentous structures and fail to induce downstream ASC polymerization, establishing that filament assembly is the mechanistic basis for AIM2's dsDNA specificity.","method":"In vitro nucleic acid binding assays, cryo-EM/electron microscopy of filament structures, ASC polymerization assays with various nucleic acid substrates","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical reconstitution with structural characterization and functional validation of ASC polymerization","pmids":["36864667"],"is_preprint":false},{"year":2017,"finding":"AIM2 reviews detail that the HIN200 domain binds dsDNA while the PYD domain nucleates ASC PYD filament formation; structural studies (X-ray crystallography and cryo-EM) reveal that AIM2 inflammasome assembly proceeds via nucleated polymerization of helical filaments from AIM2 through ASC to caspase-1.","method":"X-ray crystallography, cryo-EM structural determination of AIM2-ASC-caspase-1 complex and filament intermediates","journal":"Journal of structural biology","confidence":"High","confidence_rationale":"Tier 1 — structural determination by X-ray and cryo-EM reviewed with functional validation; foundational mechanistic insight","pmids":["28813641"],"is_preprint":false},{"year":2020,"finding":"AIM2 promotes NSCLC cell growth independently of inflammasome activation by colocalizing with mitochondria; AIM2 knockdown leads to enhanced mitochondrial fusion via MFN2 upregulation, decreased ROS production, and inactivation of the MAPK/ERK signaling pathway.","method":"AIM2 knockdown in NSCLC cells, mitochondrial colocalization imaging, MFN2 expression analysis, ROS measurement, ERK phosphorylation assays, in vivo xenograft","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic knockdown with mechanistic pathway dissection; colocalization shown; single lab","pmids":["32005973"],"is_preprint":false},{"year":2020,"finding":"AIM2 inflammasome contributes to normal neurodevelopment through gasdermin-D-mediated pyroptosis (not IL-1/IL-18); AIM2 activation purges genetically compromised CNS cells during neurodevelopment, as AIM2-deficient mice show decreased neural cell death in response to DNA-damaging agents, excess accumulation of DNA damage in neurons, and increased neuron incorporation into the adult brain.","method":"Aim2-/- mice, gasdermin-D-/- mice, DNA damage-inducing agents, neural cell death quantification, behavioral assays (anxiety), BrdU neuron incorporation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic KO models dissecting gasdermin-D vs. cytokine pathway; in vivo phenotype with mechanistic pathway placement","pmids":["32350463"],"is_preprint":false},{"year":2015,"finding":"AIM2 drives joint inflammation in a self-DNA (DNase II-deficient) model of polyarthritis; Aim2-deficient arthritis-prone mice display strongly decreased joint inflammation, reduced caspase-1 activation, and reduced pro-inflammatory cytokine production in diseased joints, establishing tissue-specific AIM2 sensor function for endogenous DNA.","method":"Aim2-/- crossed to DNase II-/- mice, caspase-1 activation assays, cytokine measurement in joints, histopathology","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis through double-KO genetic model with defined tissue-specific phenotype; single lab","pmids":["26114879"],"is_preprint":false},{"year":2016,"finding":"AIM2 competes with STING for cytosolic M. bovis DNA binding, thereby inhibiting STING-TBK1-dependent autophagy activation and IFN-β secretion in Mycobacterium-infected macrophages.","method":"AIM2-knockdown macrophages, STING pathway readouts (IFN-β secretion, TBK1 activation), autophagy flux assays, M. bovis infection model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2-3 — knockdown with defined pathway antagonism between AIM2 and STING; mechanism plausible but competitive binding not directly proven biochemically","pmids":["27409673"],"is_preprint":false},{"year":2021,"finding":"AIM2 is activated in blood monocytes infected with SARS-CoV-2 (via antibody-opsonized virus and Fc receptor CD16 uptake); abortive SARS-CoV-2 replication produces dsDNA that activates both NLRP3 and AIM2 inflammasomes, leading to caspase-1 and GSDMD activation and pyroptosis of monocytes.","method":"SARS-CoV-2-infected monocytes from COVID-19 patients, dsRNA/subgenomic RNA detection, caspase-1 and GSDMD activation assays, inflammasome genetic KO studies, lung macrophage autopsy","journal":"Research square","confidence":"Medium","confidence_rationale":"Tier 2-3 — multiple mechanistic readouts in primary patient cells; preprint; AIM2 specifically implicated through inflammasome activation assays","pmids":["34401873"],"is_preprint":true},{"year":2021,"finding":"AIM2 in Treg cells attenuates AKT phosphorylation, mTOR and MYC signaling, and glycolysis via interaction with the RACK1-PP2A phosphatase complex; TRIM11 promotes AIM2 degradation via p62-mediated selective autophagy in CD4+ T cells, reducing Treg cell stability and promoting autoimmune disease.","method":"TRIM11/AIM2 interaction confirmed by Co-IP; ubiquitination assays, Treg differentiation assays, EAE mouse model","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP, ubiquitination, and functional assays; extends mechanistic understanding; single lab","pmids":["37804507"],"is_preprint":false},{"year":2024,"finding":"EIF2AK2 directly targets and positively regulates AIM2 protein expression (confirmed by Co-IP); EIF2AK2-induced AIM2 upregulation drives PANoptosis in kidney tubular cells during septic AKI.","method":"Co-immunoprecipitation (EIF2AK2-AIM2 interaction), AIM2 knockdown in LPS-stimulated HK-2 cells, CLP mouse model, Western blot, LDH assay","journal":"Renal failure","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus genetic knockdown with defined phenotype; single lab","pmids":["39311631"],"is_preprint":false},{"year":2023,"finding":"Pristimerin enhances K63-linked ubiquitin chains of PYCARD/ASC at K158/161 by binding USP50 deubiquitinase at Cys53 (via Michael-acceptor mechanism) and blocking USP50-mediated cleavage of K63-linked ubiquitin chains; this promotes SQSTM1/p62-mediated autophagic degradation of the AIM2-PYCARD/ASC complex.","method":"Drug affinity responsive target stability (DARTS), Co-IP, ubiquitination assays with K158/161 mutagenesis, site-directed mutagenesis of USP50 Cys53, p62 interaction assays, autophagy flux assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical target identification with mutagenesis, ubiquitination site mapping, and functional autophagic degradation assays; multiple orthogonal methods","pmids":["37647255"],"is_preprint":false},{"year":2023,"finding":"NLRP3 inhibits AIM2 inflammasome-mediated uveitis by regulating the p-SIK1/SREBF1 pathway: NLRP3 deficiency downregulates p-SIK1 and upregulates SREBF1, which binds to the Aim2 promoter to drive Aim2 transcription and AIM2-mediated pyroptosis.","method":"Nlrp3-/- mice, RNA sequencing, chromatin immunoprecipitation-PCR (SREBF1 binding to Aim2 promoter), Aim2-/- mice, SREBF1 RNA silencing, NLRP3 overexpression","journal":"Arthritis & rheumatology","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-PCR showing direct transcription factor binding, genetic epistasis via multiple KOs, RNA-seq pathway identification","pmids":["36529965"],"is_preprint":false},{"year":2021,"finding":"DROSHA ribonuclease III promotes AIM2 inflammasome activation; DROSHA deficiency suppresses AIM2-dependent caspase-1 activation and IL-1β/IL-18 secretion; DROSHA-processed miRNAs promote ASC speck formation required for AIM2 inflammasome activation.","method":"DROSHA-/- primary alveolar macrophages and BMDMs, caspase-1 activation assays, ASC speck formation imaging, IL-1β/IL-18 ELISA, miRNA transduction","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic KO with multiple inflammasome readouts; miRNA mechanism partially characterized; single lab","pmids":["31434287"],"is_preprint":false},{"year":2021,"finding":"AIM2 and IFI16 (ALRs) bind neutrophil extracellular traps (NETs) both in vitro and in SLE renal tissues; ALR binding to NETs causes them to resist degradation by DNase I, suggesting a mechanism for sustained innate immune signaling.","method":"Immunoprecipitation, immunofluorescence colocalization, DNase protection assays, confocal microscopy of SLE renal tissue","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct binding shown by IP and DNase protection assay; functional link to immune activation inferred; replicated in patient tissue","pmids":["35608258"],"is_preprint":false},{"year":2021,"finding":"Nuclear AIM2-like receptors (ALRs) function as inhibitors of DNA repair by binding to and interfering with chromatin decompaction required for DNA repair, thereby accelerating genome destabilization, micronuclei generation, and cell death; this function is uncoupled from their inflammasome/innate immune role.","method":"ALR-knockout mice (irradiation resistance phenotype), chromatin binding assays, DNA repair assays, micronuclei quantification, cell death assays","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic KO with defined phenotype; chromatin binding assay; novel nuclear function dissected from inflammasome; single lab","pmids":["34658166"],"is_preprint":false},{"year":2021,"finding":"In gastric cancer, STAT3 (activated by IL-11) upregulates AIM2 expression in tumor epithelium; AIM2 physically interacts with microtubule-associated end-binding protein 1 (EB1) to promote epithelial cell migration and tumourigenesis independently of inflammasome activation.","method":"AIM2 genetic targeting in gp130F/F mouse model, AIM2-EB1 Co-IP in vivo and in vitro, xenograft models, inflammasome-independent functional assays, STAT3 reporter assays","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 — Co-IP, genetic targeting in spontaneous mouse model, xenograft validation, and mechanistic dissection of inflammasome-independent pathway","pmids":["34489308"],"is_preprint":false},{"year":2023,"finding":"AIM2 promotes FOXO3a phosphorylation and proteasome-mediated degradation in renal cell carcinoma, thereby reducing FOXO3a transcriptional activity on ACSL4 and inhibiting ferroptosis, independent of inflammasome activation.","method":"AIM2 knockdown/overexpression in RCC cells, FOXO3a phosphorylation and ubiquitination assays, ACSL4 expression analysis, ferroptosis markers, in vivo xenograft","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — defined pathway from AIM2 to FOXO3a phosphorylation to ACSL4 with functional ferroptosis readout; single lab","pmids":["36923928"],"is_preprint":false}],"current_model":"AIM2 is a cytosolic dsDNA sensor whose HIN200 domain binds dsDNA (in a duplex-length-dependent manner promoting ordered helical filament assembly) while its pyrin domain nucleates ASC filament polymerization to recruit and activate caspase-1, triggering IL-1β/IL-18 maturation and gasdermin-D-dependent pyroptosis; beyond this canonical inflammasome role, AIM2 acts as a scaffold that interacts with DNA-PK to suppress Akt activation, with RACK1-PP2A to restrain Akt/mTOR signaling in Treg cells, and with EB1 to promote cell migration, while its abundance is post-translationally controlled by USP21 deubiquitination (stabilizing it for inflammasome assembly) and by TRIM11/p62-selective autophagy (targeting it for degradation), and its activity is antagonized by viral proteins (HCMV pUL83), nuclear ALR-mediated inhibition of DNA repair, and by NLRP3 via the p-SIK1/SREBF1 transcriptional axis."},"narrative":{"teleology":[{"year":2009,"claim":"The identity of the cytosolic dsDNA sensor upstream of caspase-1 was unknown; domain mapping and knockdown showed that AIM2's HIN200 domain binds dsDNA while its pyrin domain recruits ASC to activate caspase-1, establishing AIM2 as the founding dsDNA inflammasome sensor.","evidence":"Knockdown in mouse/human cells with domain-function mapping (HIN200 vs. pyrin) and caspase-1/NF-κB assays","pmids":["19158675"],"confidence":"High","gaps":["Structural basis of DNA recognition and filament assembly not yet resolved","Mechanism by which DNA length determines activation unknown","In vivo physiological role not demonstrated"]},{"year":2013,"claim":"Whether AIM2 inflammasome activation produces only pyroptosis was unclear; demonstration that ASC specks recruit and activate caspase-8 alongside caspase-1 established that AIM2 inflammasomes can simultaneously drive pyroptosis and apoptosis.","evidence":"Live-cell imaging showing procaspase-8 localization to ASC specks, direct pyrin domain binding, and quantification of pyroptosis vs. apoptosis","pmids":["23645208"],"confidence":"High","gaps":["Whether caspase-8 is engaged in all cell types unknown","Relative contribution of each death pathway in vivo unresolved"]},{"year":2014,"claim":"The relationship between AIM2 inflammasomes and the microtubule/autophagy machinery was undefined; EB1 depletion and imaging showed that AIM2 inflammasomes associate with microtubule-organizing centers and rely on EB1 for autophagy-dependent unconventional IL-1β secretion.","evidence":"EB1 knockdown, live-cell colocalization with MTOCs and autophagosomes, LC3-dependent secretion assays","pmids":["25164813"],"confidence":"Medium","gaps":["Direct AIM2–EB1 physical interaction not shown in this study","AMPK-EB1 regulatory link mechanistically incomplete","Relevance beyond macrophages unconfirmed"]},{"year":2015,"claim":"AIM2 was considered solely a pro-inflammatory innate immune sensor; interaction with DNA-PK and suppression of Akt activation in intestinal epithelium revealed an inflammasome-independent tumor suppressor function, explaining increased colon tumorigenesis in Aim2-knockout mice.","evidence":"Reciprocal Co-IP of AIM2–DNA-PK, Aim2−/− and Asc−/− mouse tumor models (AOM/DSS, APC-Min), Akt inhibitor rescue, bone-marrow chimeras","pmids":["26107252"],"confidence":"High","gaps":["Structural basis of AIM2–DNA-PK interaction not defined","Whether DNA-PK kinase activity is directly blocked or indirectly modulated unresolved"]},{"year":2016,"claim":"How AIM2 protein levels are negatively regulated was unknown; TRIM11 was identified as an E3 ligase that ubiquitinates itself at K458 upon AIM2 binding, recruiting p62 for selective autophagic degradation of AIM2 and thereby limiting inflammasome activation.","evidence":"Co-IP, ubiquitination assays with K458 mutagenesis, siRNA, autophagy flux assays","pmids":["27498865"],"confidence":"High","gaps":["Ubiquitination sites on AIM2 itself not mapped","Tissue-specific regulation of TRIM11–AIM2 axis not established"]},{"year":2016,"claim":"Whether AIM2 antagonizes the cGAS–STING type I IFN pathway was unresolved; experiments in AIM2-deficient cells showed markedly enhanced cGAMP, STING aggregation, and IFN-β, establishing that AIM2-driven pyroptosis limits STING pathway activation by eliminating the DNA-sensing cell.","evidence":"AIM2−/−, ASC−/−, and caspase-1−/− cells with cGAMP quantification, STING aggregation, TBK1/IRF3 phosphorylation","pmids":["26927800"],"confidence":"High","gaps":["Whether AIM2 also directly competes with cGAS for DNA not biochemically proven","Cell-type differences in this antagonism not systematically explored"]},{"year":2017,"claim":"The three-dimensional architecture of the inflammasome filament was undefined; X-ray crystallography and cryo-EM revealed that AIM2 PYD nucleates helical ASC PYD filaments, which in turn template caspase-1 CARD filaments, establishing nucleated polymerization as the assembly mechanism.","evidence":"X-ray crystallography and cryo-EM of AIM2–ASC–caspase-1 filament intermediates","pmids":["28813641"],"confidence":"High","gaps":["Full-length AIM2 filament structure on dsDNA not determined at high resolution","Stoichiometry of AIM2:DNA in physiological settings unknown"]},{"year":2017,"claim":"Whether viruses directly neutralize AIM2 was unconfirmed; HCMV tegument protein pUL83 was shown to interact with AIM2 in the cytoplasm during early infection, reducing inflammasome protein expression and activation.","evidence":"Co-IP, yeast two-hybrid, immunofluorescence in infected macrophages and reconstituted HEK293T system","pmids":["28219398"],"confidence":"Medium","gaps":["pUL83 binding interface on AIM2 not mapped","Whether other herpesviruses use analogous evasion mechanisms not tested","Functional consequence limited to reconstituted system"]},{"year":2020,"claim":"AIM2's role in normal development was unknown; demonstration that AIM2 purges DNA-damaged neural precursors via gasdermin-D-dependent pyroptosis (but not IL-1/IL-18) during neurodevelopment established a physiological quality-control function for the inflammasome.","evidence":"Aim2−/− and Gsdmd−/− mice, DNA-damage agents, BrdU incorporation, behavioral assays","pmids":["32350463"],"confidence":"High","gaps":["Source of endogenous DNA damage triggering AIM2 in neural progenitors not identified","Whether this extends to non-CNS developmental contexts unknown"]},{"year":2021,"claim":"How AIM2 protein stability is positively regulated was unclear; USP21 was identified as a deubiquitinase that binds AIM2 upon DNA stimulation, removes ubiquitin to prevent proteasomal degradation, and is specifically required for AIM2–ASC complex formation but not DNA binding.","evidence":"Co-IP, deubiquitination assays, USP21 depletion, proteasome inhibition, DNA-binding and ASC-assembly assays","pmids":["34470856"],"confidence":"High","gaps":["Ubiquitin chain type(s) removed by USP21 not defined","Whether USP21 regulation is stimulus-specific not explored"]},{"year":2021,"claim":"Whether AIM2 functions outside innate immunity in T cells was unknown; conditional knockout revealed that AIM2 interacts with the RACK1–PP2A phosphatase complex in Treg cells to restrain Akt/mTOR/MYC signaling and glycolysis, promoting Treg stability independently of inflammasome activation.","evidence":"T cell-conditional AIM2 KO, Co-IP of AIM2–RACK1–PP2A, RNA-seq, metabolic profiling, lineage tracing","pmids":["33505023"],"confidence":"High","gaps":["Whether AIM2 directly bridges RACK1 to PP2A or acts allosterically unresolved","Whether DNA binding is required for this T-cell function unclear"]},{"year":2021,"claim":"Whether AIM2 participates in multi-sensor complexes beyond the canonical ASC inflammasome was unknown; Co-IP of a PANoptosome containing AIM2, pyrin, ZBP1, ASC, caspase-1, caspase-8, RIPK3, RIPK1, and FADD established that AIM2 co-assembles with other sensors to drive simultaneous pyroptosis, apoptosis, and necroptosis.","evidence":"Reciprocal Co-IP, Aim2−/−/ZBP1−/−/Pyrin−/− cells, cell death pathway dissection, HSV-1 and Francisella in vivo models","pmids":["34471287"],"confidence":"High","gaps":["Architecture and hierarchy of sensor engagement within the PANoptosome not structurally resolved","Whether all components are simultaneously present or assembled sequentially unknown"]},{"year":2021,"claim":"AIM2's role in epithelial cell migration was undefined; demonstration that STAT3-induced AIM2 binds EB1 to promote gastric epithelial migration and tumorigenesis independent of inflammasome activation established a non-immune, pro-migratory scaffolding function.","evidence":"AIM2–EB1 Co-IP in vivo and in vitro, AIM2 genetic targeting in gp130F/F mouse model, xenograft","pmids":["34489308"],"confidence":"High","gaps":["Binding interface between AIM2 and EB1 not mapped","Whether this applies to migration in non-gastric epithelia not tested"]},{"year":2023,"claim":"The basis of AIM2's nucleic acid selectivity was mechanistically unclear; in vitro reconstitution and cryo-EM showed that AIM2 forms ordered filaments only on dsDNA of sufficient length, and that disordered oligomers on non-dsDNA substrates fail to nucleate ASC polymerization, establishing filament order as the specificity checkpoint.","evidence":"In vitro binding with diverse nucleic acid substrates, cryo-EM of filaments, ASC polymerization assays","pmids":["36864667"],"confidence":"High","gaps":["Minimum dsDNA length threshold for productive filament formation not precisely defined","Whether post-translational modifications tune this threshold unknown"]},{"year":2023,"claim":"Transcriptional regulation of AIM2 by other inflammasome sensors was uncharacterized; ChIP-PCR showed that NLRP3 deficiency leads to SREBF1 upregulation, which directly binds the Aim2 promoter to increase AIM2 expression and pyroptosis in uveitis, revealing cross-regulation between NLRP3 and AIM2 inflammasomes.","evidence":"Nlrp3−/− mice, ChIP-PCR (SREBF1 on Aim2 promoter), Aim2−/− mice, SREBF1 silencing, RNA-seq","pmids":["36529965"],"confidence":"High","gaps":["Whether NLRP3-SIK1-SREBF1-AIM2 axis operates in cell types beyond ocular macrophages unknown","Direct phosphorylation targets of SIK1 in this context not mapped"]},{"year":null,"claim":"Major open questions include: the high-resolution structure of full-length AIM2 filaments assembled on physiological DNA in cells; the molecular determinants distinguishing AIM2's inflammasome-dependent from inflammasome-independent functions; and how tissue- and cell-type-specific post-translational regulation (ubiquitination, deubiquitination) integrates with transcriptional control to tune AIM2 activity in homeostasis versus disease.","evidence":"","pmids":[],"confidence":"Low","gaps":["Full-length AIM2–DNA filament structure at atomic resolution lacking","No unified model for how AIM2 toggles between inflammasome-dependent and -independent modes","Systematic mapping of AIM2 ubiquitination sites and chain types in primary cells not performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,17,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,13,31]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,10,13]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,6,17]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[30]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,7,8,10,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,14,20]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,13,31]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,11,26]}],"complexes":["AIM2 inflammasome (AIM2–ASC–caspase-1)","AIM2–pyrin–ZBP1 PANoptosome","RACK1–PP2A complex"],"partners":["ASC","CASP1","DNA-PKCS","RACK1","PP2A","EB1","TRIM11","USP21"],"other_free_text":[]},"mechanistic_narrative":"AIM2 is a cytosolic double-stranded DNA sensor that functions as the scaffold of a canonical inflammasome and also performs inflammasome-independent signaling roles in tumor suppression, T-cell metabolism, and neurodevelopment. Its HIN200 domain binds dsDNA in a duplex-length-dependent manner, nucleating ordered helical filaments whose pyrin domain in turn templates ASC filament polymerization to recruit and activate caspase-1, driving IL-1β/IL-18 maturation and gasdermin-D-dependent pyroptosis; AIM2 can also participate in a multi-sensor PANoptosome complex with pyrin and ZBP1 that simultaneously engages pyroptosis, apoptosis, and necroptosis [PMID:19158675, PMID:36864667, PMID:28813641, PMID:34471287]. Independent of inflammasome assembly, AIM2 physically interacts with DNA-PK to restrain Akt activation in intestinal epithelium, and with the RACK1–PP2A phosphatase complex to attenuate Akt/mTOR signaling and glycolysis in regulatory T cells, thereby stabilizing Treg identity and suppressing colorectal tumorigenesis [PMID:26107252, PMID:33505023]. AIM2 protein abundance is positively regulated by USP21-mediated deubiquitination that stabilizes it and permits ASC complex formation, and negatively regulated by TRIM11-dependent ubiquitination coupled to p62-selective autophagy [PMID:34470856, PMID:27498865]."},"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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abrogates caspase-1 activation in response to cytoplasmic dsDNA and vaccinia virus, establishing AIM2 as a cytosolic DNA receptor that forms a caspase-1-activating inflammasome with ASC.\",\n      \"method\": \"Knockdown experiments in mouse and human cells, domain-function mapping (HIN200 vs. pyrin domain), caspase-1 activity assays, NF-κB reporter assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original discovery with domain mutagenesis, genetic knockdown, and multiple functional readouts; foundational paper with >2000 citations replicated widely\",\n      \"pmids\": [\"19158675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AIM2 and NLRP3 inflammasomes activate both caspase-1 (pyroptosis) and caspase-8 (apoptosis) via ASC; procaspase-8 localizes to ASC inflammasome specks and binds directly to the pyrin domain of ASC, making caspase-8 an integral inflammasome component.\",\n      \"method\": \"Gene knockdown, live-cell imaging, co-localization of procaspase-8 with ASC specks, direct binding assay (pyrin domain of ASC), pyroptosis vs. apoptosis quantification at varying DNA concentrations\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (knockdown, direct binding, imaging), replicated mechanistic finding\",\n      \"pmids\": [\"23645208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In resting cells, AIM2 physically interacts with and limits activation of DNA-dependent protein kinase (DNA-PK), a PI3K-related kinase that promotes Akt phosphorylation; loss of AIM2 promotes DNA-PK-mediated Akt activation to enhance tumor growth, independent of inflammasome activation.\",\n      \"method\": \"Co-immunoprecipitation, Aim2-/- and Asc-/- mouse tumor models (AOM/DSS and APC-Min), Akt inhibitor rescue, bone-marrow chimera studies\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, multiple genetic mouse models, pharmacologic rescue; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"26107252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIM11 binds AIM2 via its PS domain and undergoes auto-polyubiquitination at K458, promoting association with the autophagic cargo receptor p62 to mediate AIM2 degradation via selective autophagy, thereby suppressing AIM2 inflammasome activation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, site-directed mutagenesis (K458), siRNA knockdown, autophagy flux assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical reconstitution of ubiquitination, mutagenesis, and autophagy assays in single study with multiple orthogonal approaches\",\n      \"pmids\": [\"27498865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PKM2-mediated glycolysis promotes AIM2 inflammasome activation through EIF2AK2 phosphorylation in macrophages; pharmacological or genetic inhibition of PKM2 or EIF2AK2 attenuates AIM2 inflammasome activation and IL-1β/IL-18 release.\",\n      \"method\": \"PKM2 conditional knockout in myeloid cells, pharmacologic inhibition, EIF2AK2 knockdown, IL-1β/IL-18 ELISA, in vivo sepsis models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout plus pharmacologic inhibition with defined pathway placement and in vivo validation\",\n      \"pmids\": [\"27779186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"25-hydroxycholesterol (25-HC) produced by macrophage cholesterol-25-hydroxylase (Ch25h) prevents AIM2 inflammasome activation; Ch25h deficiency causes cholesterol accumulation, which reduces mitochondrial respiratory capacity and releases mitochondrial DNA into the cytosol to activate AIM2; AIM2 deficiency rescues the increased inflammasome activity of Ch25h-/- macrophages.\",\n      \"method\": \"Ch25h-/- and Aim2-/- macrophages, mitochondrial function assays, cytosolic mtDNA quantification, IL-1β secretion assays, genetic epistasis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (double KO rescue), multiple mechanistic readouts, published in high-impact journal\",\n      \"pmids\": [\"29033131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HCMV tegument protein pUL83 directly interacts with AIM2 in the cytoplasm during early infection; the pUL83/AIM2 interaction reduces expression and activation of AIM2 inflammasome-associated proteins, constituting a viral immune evasion mechanism.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, immunofluorescence co-localization, reconstituted HEK293T inflammasome system with pUL83 expression\",\n      \"journal\": \"Virology journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP confirmed in infected macrophages and transfected cells; functional consequence shown in reconstituted system; single lab\",\n      \"pmids\": [\"28219398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AIM2 inflammasome activation by influenza A virus (IAV) results from IAV-induced dsDNA release and caspase-1 activation in macrophages specifically; AIM2-deficient mice show attenuated lung injury with improved survival but unaltered viral burden and adaptive immunity, establishing a macrophage-specific AIM2 function in IAV-induced lung injury.\",\n      \"method\": \"Aim2-/- mice, AIM2-specific siRNA in human/mouse alveolar macrophages and type II cells, caspase-1 activation assays, in vivo influenza challenge\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined cellular phenotype, siRNA validation in primary human and mouse cells, in vivo model\",\n      \"pmids\": [\"28424239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AIM2 inflammasome is activated in macrophages that engulf DNA from necrotic cells; DNA uptake occurs in large vacuolar structures within recruited macrophages; DNase I treatment attenuates IL-1β levels, confirming dsDNA as the principal DAMP; AIM2-dependent caspase-1 activation and ASC speck formation drive a proinflammatory phenotype contributing to CKD progression.\",\n      \"method\": \"Bone marrow chimera studies, intravital microscopy, Aim2-/- mice, in vitro macrophage engulfment assays with DNase I treatment, caspase-1 activity assays, ASC speck imaging\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and in vitro approaches, bone marrow chimera genetic dissection, mechanistic DNase validation\",\n      \"pmids\": [\"29439156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AIM2 antagonizes IFI205-mediated type I IFN induction by sequestering IFI205 away from STING, revealing AIM2 as a negative regulator of the interferon response to cytosolic retrotransposon DNA.\",\n      \"method\": \"Aim2-knockout macrophages, cGAMP measurement, STING aggregation assays, ALR-complementation experiments\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic KO with defined pathway placement; sequestration mechanism inferred from biochemical assays; single lab\",\n      \"pmids\": [\"28679751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AIM2 deficiency in dendritic cells and macrophages leads to markedly higher IFN-β production in response to DNA via enhanced cGAMP generation, STING aggregation, and TBK1/IRF3 phosphorylation; AIM2-induced pyroptosis (caspase-1-dependent cell death) is a major mechanism suppressing STING pathway activation.\",\n      \"method\": \"AIM2-/-, ASC-/-, and caspase-1-/- cells, cGAMP measurement, STING aggregation assays, TBK1/IRF3 phosphorylation, caspase-1 inhibition\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic KO lines with mechanistic biochemical readouts; antagonistic pathway definitively placed\",\n      \"pmids\": [\"26927800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HMGB1-DNA complex initially activates AIM2-dependent inflammasome and IL-1β release via RAGE receptor; subsequently, HMGB1-DNA triggers ATG5-dependent autophagy that limits AIM2 inflammasome activation, identifying autophagy as a negative counter-regulatory mechanism.\",\n      \"method\": \"RAGE-/- macrophages, ATG5 knockdown, IL-1β ELISA, inflammasome assembly assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic knockouts with functional readouts; pathway placement established; single lab with limited orthogonal approaches\",\n      \"pmids\": [\"24971542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"End-binding protein 1 (EB1) is required for AIM2 inflammasome activation and links AIM2 inflammasomes to autophagy-dependent IL-1β secretion; AIM2 inflammasomes colocalize with microtubule organizing centers and autophagosomes; 5'-AMP activated protein kinase regulates EB1-mediated autophagy-based inflammasome-induced secretion.\",\n      \"method\": \"EB1 depletion, live-cell imaging (colocalization with MTOCs and autophagosomes), autophagy flux assays, IL-1β secretion assays, LC3-dependent secretion assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — EB1 depletion with imaging and functional readouts; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"25164813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 has an inflammasome-independent, T cell-intrinsic role in regulatory T (Treg) cells: AIM2 interacts with the RACK1-PP2A phosphatase complex to restrain AKT phosphorylation, attenuating mTOR and MYC signaling and glycolysis while promoting oxidative phosphorylation, thereby enhancing Treg cell stability.\",\n      \"method\": \"T cell-conditional AIM2 knockout, RNA sequencing, biochemical/metabolic analyses, Co-IP (AIM2-RACK1-PP2A complex), lineage-tracing, AKT phosphorylation assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP of AIM2-RACK1-PP2A complex, conditional KO, metabolic and biochemical assays; multiple orthogonal methods in single study\",\n      \"pmids\": [\"33505023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 forms a large multi-protein complex (PANoptosome) with pyrin and ZBP1, along with ASC, caspase-1, caspase-8, RIPK3, RIPK1, and FADD, to drive PANoptosis (simultaneous apoptosis, necroptosis, and pyroptosis) and host protection during HSV-1 and Francisella novicida infection.\",\n      \"method\": \"Co-immunoprecipitation of multi-protein complex, genetic knockouts (Aim2-/-, ZBP1-/-, Pyrin-/-), cell death assays (pyroptosis, apoptosis, necroptosis), in vivo infection models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP of the multi-protein complex, multiple genetic KOs with defined cell death phenotypes, in vivo validation\",\n      \"pmids\": [\"34471287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM11 promotes selective autophagic degradation of AIM2 in CD4+ T cells by inducing AIM2 ubiquitination and binding to p62, thereby negatively regulating Treg cell differentiation in an AIM2-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation (TRIM11-AIM2 and p62 interaction), ubiquitination assays, TRIM11 knockdown/overexpression in CD4+ T cells, Treg differentiation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP, ubiquitination assays, functional Treg assays; extends TRIM11-AIM2 mechanism to T cells; single lab\",\n      \"pmids\": [\"37804507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP21 deubiquitinase binds to AIM2 upon DNA stimulation and deubiquitinates it, increasing its protein stability and preventing proteasomal degradation; additionally, USP21-mediated deubiquitination is required for AIM2-ASC complex formation (inflammasome assembly) but does not affect AIM2's DNA-binding ability.\",\n      \"method\": \"Co-immunoprecipitation, deubiquitination assays, USP21 depletion, proteasome inhibition, DNA-binding assays, AIM2-ASC complex assembly assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical deubiquitination assays, multiple functional readouts (stability, complex assembly, DNA binding) dissected separately; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"34470856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AIM2 preferentially binds dsDNA over ssDNA, dsRNA, ssRNA, or DNA:RNA hybrids in a duplex length-dependent manner; AIM2 oligomers assembled on non-dsDNA substrates display less ordered filamentous structures and fail to induce downstream ASC polymerization, establishing that filament assembly is the mechanistic basis for AIM2's dsDNA specificity.\",\n      \"method\": \"In vitro nucleic acid binding assays, cryo-EM/electron microscopy of filament structures, ASC polymerization assays with various nucleic acid substrates\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical reconstitution with structural characterization and functional validation of ASC polymerization\",\n      \"pmids\": [\"36864667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AIM2 reviews detail that the HIN200 domain binds dsDNA while the PYD domain nucleates ASC PYD filament formation; structural studies (X-ray crystallography and cryo-EM) reveal that AIM2 inflammasome assembly proceeds via nucleated polymerization of helical filaments from AIM2 through ASC to caspase-1.\",\n      \"method\": \"X-ray crystallography, cryo-EM structural determination of AIM2-ASC-caspase-1 complex and filament intermediates\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural determination by X-ray and cryo-EM reviewed with functional validation; foundational mechanistic insight\",\n      \"pmids\": [\"28813641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AIM2 promotes NSCLC cell growth independently of inflammasome activation by colocalizing with mitochondria; AIM2 knockdown leads to enhanced mitochondrial fusion via MFN2 upregulation, decreased ROS production, and inactivation of the MAPK/ERK signaling pathway.\",\n      \"method\": \"AIM2 knockdown in NSCLC cells, mitochondrial colocalization imaging, MFN2 expression analysis, ROS measurement, ERK phosphorylation assays, in vivo xenograft\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic knockdown with mechanistic pathway dissection; colocalization shown; single lab\",\n      \"pmids\": [\"32005973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AIM2 inflammasome contributes to normal neurodevelopment through gasdermin-D-mediated pyroptosis (not IL-1/IL-18); AIM2 activation purges genetically compromised CNS cells during neurodevelopment, as AIM2-deficient mice show decreased neural cell death in response to DNA-damaging agents, excess accumulation of DNA damage in neurons, and increased neuron incorporation into the adult brain.\",\n      \"method\": \"Aim2-/- mice, gasdermin-D-/- mice, DNA damage-inducing agents, neural cell death quantification, behavioral assays (anxiety), BrdU neuron incorporation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic KO models dissecting gasdermin-D vs. cytokine pathway; in vivo phenotype with mechanistic pathway placement\",\n      \"pmids\": [\"32350463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AIM2 drives joint inflammation in a self-DNA (DNase II-deficient) model of polyarthritis; Aim2-deficient arthritis-prone mice display strongly decreased joint inflammation, reduced caspase-1 activation, and reduced pro-inflammatory cytokine production in diseased joints, establishing tissue-specific AIM2 sensor function for endogenous DNA.\",\n      \"method\": \"Aim2-/- crossed to DNase II-/- mice, caspase-1 activation assays, cytokine measurement in joints, histopathology\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis through double-KO genetic model with defined tissue-specific phenotype; single lab\",\n      \"pmids\": [\"26114879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AIM2 competes with STING for cytosolic M. bovis DNA binding, thereby inhibiting STING-TBK1-dependent autophagy activation and IFN-β secretion in Mycobacterium-infected macrophages.\",\n      \"method\": \"AIM2-knockdown macrophages, STING pathway readouts (IFN-β secretion, TBK1 activation), autophagy flux assays, M. bovis infection model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — knockdown with defined pathway antagonism between AIM2 and STING; mechanism plausible but competitive binding not directly proven biochemically\",\n      \"pmids\": [\"27409673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 is activated in blood monocytes infected with SARS-CoV-2 (via antibody-opsonized virus and Fc receptor CD16 uptake); abortive SARS-CoV-2 replication produces dsDNA that activates both NLRP3 and AIM2 inflammasomes, leading to caspase-1 and GSDMD activation and pyroptosis of monocytes.\",\n      \"method\": \"SARS-CoV-2-infected monocytes from COVID-19 patients, dsRNA/subgenomic RNA detection, caspase-1 and GSDMD activation assays, inflammasome genetic KO studies, lung macrophage autopsy\",\n      \"journal\": \"Research square\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple mechanistic readouts in primary patient cells; preprint; AIM2 specifically implicated through inflammasome activation assays\",\n      \"pmids\": [\"34401873\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 in Treg cells attenuates AKT phosphorylation, mTOR and MYC signaling, and glycolysis via interaction with the RACK1-PP2A phosphatase complex; TRIM11 promotes AIM2 degradation via p62-mediated selective autophagy in CD4+ T cells, reducing Treg cell stability and promoting autoimmune disease.\",\n      \"method\": \"TRIM11/AIM2 interaction confirmed by Co-IP; ubiquitination assays, Treg differentiation assays, EAE mouse model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP, ubiquitination, and functional assays; extends mechanistic understanding; single lab\",\n      \"pmids\": [\"37804507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EIF2AK2 directly targets and positively regulates AIM2 protein expression (confirmed by Co-IP); EIF2AK2-induced AIM2 upregulation drives PANoptosis in kidney tubular cells during septic AKI.\",\n      \"method\": \"Co-immunoprecipitation (EIF2AK2-AIM2 interaction), AIM2 knockdown in LPS-stimulated HK-2 cells, CLP mouse model, Western blot, LDH assay\",\n      \"journal\": \"Renal failure\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus genetic knockdown with defined phenotype; single lab\",\n      \"pmids\": [\"39311631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pristimerin enhances K63-linked ubiquitin chains of PYCARD/ASC at K158/161 by binding USP50 deubiquitinase at Cys53 (via Michael-acceptor mechanism) and blocking USP50-mediated cleavage of K63-linked ubiquitin chains; this promotes SQSTM1/p62-mediated autophagic degradation of the AIM2-PYCARD/ASC complex.\",\n      \"method\": \"Drug affinity responsive target stability (DARTS), Co-IP, ubiquitination assays with K158/161 mutagenesis, site-directed mutagenesis of USP50 Cys53, p62 interaction assays, autophagy flux assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical target identification with mutagenesis, ubiquitination site mapping, and functional autophagic degradation assays; multiple orthogonal methods\",\n      \"pmids\": [\"37647255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NLRP3 inhibits AIM2 inflammasome-mediated uveitis by regulating the p-SIK1/SREBF1 pathway: NLRP3 deficiency downregulates p-SIK1 and upregulates SREBF1, which binds to the Aim2 promoter to drive Aim2 transcription and AIM2-mediated pyroptosis.\",\n      \"method\": \"Nlrp3-/- mice, RNA sequencing, chromatin immunoprecipitation-PCR (SREBF1 binding to Aim2 promoter), Aim2-/- mice, SREBF1 RNA silencing, NLRP3 overexpression\",\n      \"journal\": \"Arthritis & rheumatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-PCR showing direct transcription factor binding, genetic epistasis via multiple KOs, RNA-seq pathway identification\",\n      \"pmids\": [\"36529965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DROSHA ribonuclease III promotes AIM2 inflammasome activation; DROSHA deficiency suppresses AIM2-dependent caspase-1 activation and IL-1β/IL-18 secretion; DROSHA-processed miRNAs promote ASC speck formation required for AIM2 inflammasome activation.\",\n      \"method\": \"DROSHA-/- primary alveolar macrophages and BMDMs, caspase-1 activation assays, ASC speck formation imaging, IL-1β/IL-18 ELISA, miRNA transduction\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic KO with multiple inflammasome readouts; miRNA mechanism partially characterized; single lab\",\n      \"pmids\": [\"31434287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 and IFI16 (ALRs) bind neutrophil extracellular traps (NETs) both in vitro and in SLE renal tissues; ALR binding to NETs causes them to resist degradation by DNase I, suggesting a mechanism for sustained innate immune signaling.\",\n      \"method\": \"Immunoprecipitation, immunofluorescence colocalization, DNase protection assays, confocal microscopy of SLE renal tissue\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct binding shown by IP and DNase protection assay; functional link to immune activation inferred; replicated in patient tissue\",\n      \"pmids\": [\"35608258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nuclear AIM2-like receptors (ALRs) function as inhibitors of DNA repair by binding to and interfering with chromatin decompaction required for DNA repair, thereby accelerating genome destabilization, micronuclei generation, and cell death; this function is uncoupled from their inflammasome/innate immune role.\",\n      \"method\": \"ALR-knockout mice (irradiation resistance phenotype), chromatin binding assays, DNA repair assays, micronuclei quantification, cell death assays\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic KO with defined phenotype; chromatin binding assay; novel nuclear function dissected from inflammasome; single lab\",\n      \"pmids\": [\"34658166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In gastric cancer, STAT3 (activated by IL-11) upregulates AIM2 expression in tumor epithelium; AIM2 physically interacts with microtubule-associated end-binding protein 1 (EB1) to promote epithelial cell migration and tumourigenesis independently of inflammasome activation.\",\n      \"method\": \"AIM2 genetic targeting in gp130F/F mouse model, AIM2-EB1 Co-IP in vivo and in vitro, xenograft models, inflammasome-independent functional assays, STAT3 reporter assays\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, genetic targeting in spontaneous mouse model, xenograft validation, and mechanistic dissection of inflammasome-independent pathway\",\n      \"pmids\": [\"34489308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AIM2 promotes FOXO3a phosphorylation and proteasome-mediated degradation in renal cell carcinoma, thereby reducing FOXO3a transcriptional activity on ACSL4 and inhibiting ferroptosis, independent of inflammasome activation.\",\n      \"method\": \"AIM2 knockdown/overexpression in RCC cells, FOXO3a phosphorylation and ubiquitination assays, ACSL4 expression analysis, ferroptosis markers, in vivo xenograft\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — defined pathway from AIM2 to FOXO3a phosphorylation to ACSL4 with functional ferroptosis readout; single lab\",\n      \"pmids\": [\"36923928\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AIM2 is a cytosolic dsDNA sensor whose HIN200 domain binds dsDNA (in a duplex-length-dependent manner promoting ordered helical filament assembly) while its pyrin domain nucleates ASC filament polymerization to recruit and activate caspase-1, triggering IL-1β/IL-18 maturation and gasdermin-D-dependent pyroptosis; beyond this canonical inflammasome role, AIM2 acts as a scaffold that interacts with DNA-PK to suppress Akt activation, with RACK1-PP2A to restrain Akt/mTOR signaling in Treg cells, and with EB1 to promote cell migration, while its abundance is post-translationally controlled by USP21 deubiquitination (stabilizing it for inflammasome assembly) and by TRIM11/p62-selective autophagy (targeting it for degradation), and its activity is antagonized by viral proteins (HCMV pUL83), nuclear ALR-mediated inhibition of DNA repair, and by NLRP3 via the p-SIK1/SREBF1 transcriptional axis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AIM2 is a cytosolic double-stranded DNA sensor that functions as the scaffold of a canonical inflammasome and also performs inflammasome-independent signaling roles in tumor suppression, T-cell metabolism, and neurodevelopment. Its HIN200 domain binds dsDNA in a duplex-length-dependent manner, nucleating ordered helical filaments whose pyrin domain in turn templates ASC filament polymerization to recruit and activate caspase-1, driving IL-1β/IL-18 maturation and gasdermin-D-dependent pyroptosis; AIM2 can also participate in a multi-sensor PANoptosome complex with pyrin and ZBP1 that simultaneously engages pyroptosis, apoptosis, and necroptosis [PMID:19158675, PMID:36864667, PMID:28813641, PMID:34471287]. Independent of inflammasome assembly, AIM2 physically interacts with DNA-PK to restrain Akt activation in intestinal epithelium, and with the RACK1–PP2A phosphatase complex to attenuate Akt/mTOR signaling and glycolysis in regulatory T cells, thereby stabilizing Treg identity and suppressing colorectal tumorigenesis [PMID:26107252, PMID:33505023]. AIM2 protein abundance is positively regulated by USP21-mediated deubiquitination that stabilizes it and permits ASC complex formation, and negatively regulated by TRIM11-dependent ubiquitination coupled to p62-selective autophagy [PMID:34470856, PMID:27498865].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"The identity of the cytosolic dsDNA sensor upstream of caspase-1 was unknown; domain mapping and knockdown showed that AIM2's HIN200 domain binds dsDNA while its pyrin domain recruits ASC to activate caspase-1, establishing AIM2 as the founding dsDNA inflammasome sensor.\",\n      \"evidence\": \"Knockdown in mouse/human cells with domain-function mapping (HIN200 vs. pyrin) and caspase-1/NF-κB assays\",\n      \"pmids\": [\"19158675\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DNA recognition and filament assembly not yet resolved\", \"Mechanism by which DNA length determines activation unknown\", \"In vivo physiological role not demonstrated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Whether AIM2 inflammasome activation produces only pyroptosis was unclear; demonstration that ASC specks recruit and activate caspase-8 alongside caspase-1 established that AIM2 inflammasomes can simultaneously drive pyroptosis and apoptosis.\",\n      \"evidence\": \"Live-cell imaging showing procaspase-8 localization to ASC specks, direct pyrin domain binding, and quantification of pyroptosis vs. apoptosis\",\n      \"pmids\": [\"23645208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether caspase-8 is engaged in all cell types unknown\", \"Relative contribution of each death pathway in vivo unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The relationship between AIM2 inflammasomes and the microtubule/autophagy machinery was undefined; EB1 depletion and imaging showed that AIM2 inflammasomes associate with microtubule-organizing centers and rely on EB1 for autophagy-dependent unconventional IL-1β secretion.\",\n      \"evidence\": \"EB1 knockdown, live-cell colocalization with MTOCs and autophagosomes, LC3-dependent secretion assays\",\n      \"pmids\": [\"25164813\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct AIM2–EB1 physical interaction not shown in this study\", \"AMPK-EB1 regulatory link mechanistically incomplete\", \"Relevance beyond macrophages unconfirmed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"AIM2 was considered solely a pro-inflammatory innate immune sensor; interaction with DNA-PK and suppression of Akt activation in intestinal epithelium revealed an inflammasome-independent tumor suppressor function, explaining increased colon tumorigenesis in Aim2-knockout mice.\",\n      \"evidence\": \"Reciprocal Co-IP of AIM2–DNA-PK, Aim2−/− and Asc−/− mouse tumor models (AOM/DSS, APC-Min), Akt inhibitor rescue, bone-marrow chimeras\",\n      \"pmids\": [\"26107252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of AIM2–DNA-PK interaction not defined\", \"Whether DNA-PK kinase activity is directly blocked or indirectly modulated unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"How AIM2 protein levels are negatively regulated was unknown; TRIM11 was identified as an E3 ligase that ubiquitinates itself at K458 upon AIM2 binding, recruiting p62 for selective autophagic degradation of AIM2 and thereby limiting inflammasome activation.\",\n      \"evidence\": \"Co-IP, ubiquitination assays with K458 mutagenesis, siRNA, autophagy flux assays\",\n      \"pmids\": [\"27498865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitination sites on AIM2 itself not mapped\", \"Tissue-specific regulation of TRIM11–AIM2 axis not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether AIM2 antagonizes the cGAS–STING type I IFN pathway was unresolved; experiments in AIM2-deficient cells showed markedly enhanced cGAMP, STING aggregation, and IFN-β, establishing that AIM2-driven pyroptosis limits STING pathway activation by eliminating the DNA-sensing cell.\",\n      \"evidence\": \"AIM2−/−, ASC−/−, and caspase-1−/− cells with cGAMP quantification, STING aggregation, TBK1/IRF3 phosphorylation\",\n      \"pmids\": [\"26927800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AIM2 also directly competes with cGAS for DNA not biochemically proven\", \"Cell-type differences in this antagonism not systematically explored\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The three-dimensional architecture of the inflammasome filament was undefined; X-ray crystallography and cryo-EM revealed that AIM2 PYD nucleates helical ASC PYD filaments, which in turn template caspase-1 CARD filaments, establishing nucleated polymerization as the assembly mechanism.\",\n      \"evidence\": \"X-ray crystallography and cryo-EM of AIM2–ASC–caspase-1 filament intermediates\",\n      \"pmids\": [\"28813641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length AIM2 filament structure on dsDNA not determined at high resolution\", \"Stoichiometry of AIM2:DNA in physiological settings unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Whether viruses directly neutralize AIM2 was unconfirmed; HCMV tegument protein pUL83 was shown to interact with AIM2 in the cytoplasm during early infection, reducing inflammasome protein expression and activation.\",\n      \"evidence\": \"Co-IP, yeast two-hybrid, immunofluorescence in infected macrophages and reconstituted HEK293T system\",\n      \"pmids\": [\"28219398\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"pUL83 binding interface on AIM2 not mapped\", \"Whether other herpesviruses use analogous evasion mechanisms not tested\", \"Functional consequence limited to reconstituted system\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"AIM2's role in normal development was unknown; demonstration that AIM2 purges DNA-damaged neural precursors via gasdermin-D-dependent pyroptosis (but not IL-1/IL-18) during neurodevelopment established a physiological quality-control function for the inflammasome.\",\n      \"evidence\": \"Aim2−/− and Gsdmd−/− mice, DNA-damage agents, BrdU incorporation, behavioral assays\",\n      \"pmids\": [\"32350463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of endogenous DNA damage triggering AIM2 in neural progenitors not identified\", \"Whether this extends to non-CNS developmental contexts unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"How AIM2 protein stability is positively regulated was unclear; USP21 was identified as a deubiquitinase that binds AIM2 upon DNA stimulation, removes ubiquitin to prevent proteasomal degradation, and is specifically required for AIM2–ASC complex formation but not DNA binding.\",\n      \"evidence\": \"Co-IP, deubiquitination assays, USP21 depletion, proteasome inhibition, DNA-binding and ASC-assembly assays\",\n      \"pmids\": [\"34470856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin chain type(s) removed by USP21 not defined\", \"Whether USP21 regulation is stimulus-specific not explored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether AIM2 functions outside innate immunity in T cells was unknown; conditional knockout revealed that AIM2 interacts with the RACK1–PP2A phosphatase complex in Treg cells to restrain Akt/mTOR/MYC signaling and glycolysis, promoting Treg stability independently of inflammasome activation.\",\n      \"evidence\": \"T cell-conditional AIM2 KO, Co-IP of AIM2–RACK1–PP2A, RNA-seq, metabolic profiling, lineage tracing\",\n      \"pmids\": [\"33505023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AIM2 directly bridges RACK1 to PP2A or acts allosterically unresolved\", \"Whether DNA binding is required for this T-cell function unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether AIM2 participates in multi-sensor complexes beyond the canonical ASC inflammasome was unknown; Co-IP of a PANoptosome containing AIM2, pyrin, ZBP1, ASC, caspase-1, caspase-8, RIPK3, RIPK1, and FADD established that AIM2 co-assembles with other sensors to drive simultaneous pyroptosis, apoptosis, and necroptosis.\",\n      \"evidence\": \"Reciprocal Co-IP, Aim2−/−/ZBP1−/−/Pyrin−/− cells, cell death pathway dissection, HSV-1 and Francisella in vivo models\",\n      \"pmids\": [\"34471287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Architecture and hierarchy of sensor engagement within the PANoptosome not structurally resolved\", \"Whether all components are simultaneously present or assembled sequentially unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"AIM2's role in epithelial cell migration was undefined; demonstration that STAT3-induced AIM2 binds EB1 to promote gastric epithelial migration and tumorigenesis independent of inflammasome activation established a non-immune, pro-migratory scaffolding function.\",\n      \"evidence\": \"AIM2–EB1 Co-IP in vivo and in vitro, AIM2 genetic targeting in gp130F/F mouse model, xenograft\",\n      \"pmids\": [\"34489308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface between AIM2 and EB1 not mapped\", \"Whether this applies to migration in non-gastric epithelia not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The basis of AIM2's nucleic acid selectivity was mechanistically unclear; in vitro reconstitution and cryo-EM showed that AIM2 forms ordered filaments only on dsDNA of sufficient length, and that disordered oligomers on non-dsDNA substrates fail to nucleate ASC polymerization, establishing filament order as the specificity checkpoint.\",\n      \"evidence\": \"In vitro binding with diverse nucleic acid substrates, cryo-EM of filaments, ASC polymerization assays\",\n      \"pmids\": [\"36864667\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Minimum dsDNA length threshold for productive filament formation not precisely defined\", \"Whether post-translational modifications tune this threshold unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Transcriptional regulation of AIM2 by other inflammasome sensors was uncharacterized; ChIP-PCR showed that NLRP3 deficiency leads to SREBF1 upregulation, which directly binds the Aim2 promoter to increase AIM2 expression and pyroptosis in uveitis, revealing cross-regulation between NLRP3 and AIM2 inflammasomes.\",\n      \"evidence\": \"Nlrp3−/− mice, ChIP-PCR (SREBF1 on Aim2 promoter), Aim2−/− mice, SREBF1 silencing, RNA-seq\",\n      \"pmids\": [\"36529965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NLRP3-SIK1-SREBF1-AIM2 axis operates in cell types beyond ocular macrophages unknown\", \"Direct phosphorylation targets of SIK1 in this context not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include: the high-resolution structure of full-length AIM2 filaments assembled on physiological DNA in cells; the molecular determinants distinguishing AIM2's inflammasome-dependent from inflammasome-independent functions; and how tissue- and cell-type-specific post-translational regulation (ubiquitination, deubiquitination) integrates with transcriptional control to tune AIM2 activity in homeostasis versus disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Full-length AIM2–DNA filament structure at atomic resolution lacking\", \"No unified model for how AIM2 toggles between inflammasome-dependent and -independent modes\", \"Systematic mapping of AIM2 ubiquitination sites and chain types in primary cells not performed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 17, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 13, 31]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 10, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 6, 17]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [30]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 7, 8, 10, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 14, 20]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 13, 31]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 11, 26]}\n    ],\n    \"complexes\": [\n      \"AIM2 inflammasome (AIM2–ASC–caspase-1)\",\n      \"AIM2–pyrin–ZBP1 PANoptosome\",\n      \"RACK1–PP2A complex\"\n    ],\n    \"partners\": [\n      \"ASC\",\n      \"CASP1\",\n      \"DNA-PKcs\",\n      \"RACK1\",\n      \"PP2A\",\n      \"EB1\",\n      \"TRIM11\",\n      \"USP21\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}