{"gene":"ATF6","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2001,"finding":"ATF6 transcriptionally induces XBP1 mRNA, which is then spliced by IRE1 to produce a potent UPR transcriptional activator; thus ATF6 and IRE1 pathways converge through XBP1 regulation.","method":"Reporter assays, Northern blot, IRE1α-null MEFs and S2P-deficient CHO cells (genetic epistasis), splicing assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods, replicated across two labs (PMID:11779464 and PMID:11850408)","pmids":["11779464","11850408"],"is_preprint":false},{"year":2000,"finding":"ATF6 activates the ER stress response element (ERSE) as a transcription factor; upon ER stress (thapsigargin), ATF6 undergoes proteolytic cleavage to generate a faster-migrating soluble nuclear form that drives ERSE-dependent transcription. Optimal activation requires NF-Y binding to ERSE and YY1 interacts with ATF6 to enhance its activity.","method":"Biochemical fractionation, immunofluorescence, reporter/luciferase assays, co-immunoprecipitation (YY1–ATF6), mutagenesis of ERSE","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods in a single rigorous paper with functional validation","pmids":["10866666"],"is_preprint":false},{"year":1997,"finding":"ATF6, a bZIP protein, physically interacts with the transcriptional activation domain of serum response factor (SRF); ATF6-VP16 chimera activates SRE reporters and antisense ATF6 reduces serum-induced c-fos expression, placing ATF6 as a co-activator in SRF-mediated transcription.","method":"Yeast two-hybrid screen, in vitro binding assay, reporter assay, antisense construct","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — yeast interaction + in vitro binding + reporter assay, single lab","pmids":["9271374"],"is_preprint":false},{"year":2002,"finding":"ATF6 is cleaved at the Golgi by Site-1 protease (S1P) and Site-2 protease (S2P), generating the active N-terminal p50ATF6 fragment that translocates to the nucleus to activate UPR target genes; S2P-deficient CHO cells fail to cleave ATF6 or activate downstream UPR transcription.","method":"S2P-deficient CHO cell genetic system, immunoblot, nuclear fractionation, reporter assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 — genetic loss-of-function with defined biochemical readout, replicated","pmids":["11850408"],"is_preprint":false},{"year":2002,"finding":"BiP (GRP78) dissociation from ATF6's luminal domain initiates ATF6 transport to the Golgi for proteolytic activation; BiP binding retains ATF6 in the ER and senses the ER folding capacity.","method":"Commentary on co-immunoprecipitation and transport studies showing BiP–ATF6 interaction and its stress-regulated release","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic model supported by biochemical evidence reviewed in this paper; foundational concept replicated widely","pmids":["12110159"],"is_preprint":false},{"year":2002,"finding":"The N-terminal 93 amino acids of ATF6 contain a VP16-homologous VN8-like domain required for both transcriptional activation and rapid proteasomal degradation of ATF6; point mutations in VN8 abolish transcription and increase ATF6 half-life.","method":"Deletion and point mutant constructs, reporter assays, proteasome inhibitor treatment, pulse-chase","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — structure-function mutagenesis with multiple readouts in a single rigorous paper","pmids":["11909875"],"is_preprint":false},{"year":2002,"finding":"Nitric oxide-induced ER stress causes proteolytic cleavage of p90ATF6 to p50ATF6, which translocates to the nucleus and binds the ERSE of the CHOP gene, driving CHOP expression and apoptosis in macrophages; overexpression of p50ATF6 alone induces cell death reversed by dominant-negative CHOP.","method":"Immunoblot, nuclear fractionation, EMSA, reporter assay, transfection with p90/p50ATF6 expression plasmids, CHOP-knockout macrophages","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal approaches including genetic KO validation","pmids":["11805088"],"is_preprint":false},{"year":2004,"finding":"ATF6 differentially activates ERSE (requiring NF-Y), UPRE (does not bind ATF6; XBP1-dependent), and ERSE-II (NF-Y-dependent ATF6 binding plus NF-Y-independent XBP1 binding); ATF6 alone is sufficient to drive BiP/ERSE transcription without XBP1, while Herp/ERSE-II induction requires both.","method":"XBP1-null MEFs, reporter assays, EMSA, NF-Y interaction assays","journal":"Journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 — genetic null cells + biochemical binding assays + reporters","pmids":["15598891"],"is_preprint":false},{"year":2004,"finding":"SKI-1/S1P is the first protease that cleaves ATF6 at the Golgi; protein-based inhibitors (alpha-1-antitrypsin variants and prosegment mutant R134E) block SKI-1 and reduce ATF6 processing by >55%, forming SDS-stable complexes with SKI-1.","method":"Transient transfection, stable cell lines, immunoblot of SREBP-2 and ATF6 processing, SDS-PAGE complex formation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct enzymatic inhibition with defined protein-based inhibitors and biochemical readout","pmids":["14970232"],"is_preprint":false},{"year":2008,"finding":"VAPB (and VAPA) MSP domain physically interacts with ATF6; overexpression of VAPB or the ALS-associated VAPB-P56S mutant attenuates ATF6-regulated transcription, with VAPB-P56S being a more potent inhibitor.","method":"Co-immunoprecipitation, reporter assays, overexpression of VAPB/VAPB(P56S)","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP plus functional reporter; single lab","pmids":["18263603"],"is_preprint":false},{"year":2009,"finding":"Simulated ischemia activates ATF6 in cardiac myocytes, causing its translocation from ER to nucleus where it binds an ERSE in the GRP78 promoter to drive GRP78 expression; dominant-negative ATF6 or ATF6-targeted miRNA blocks ischemia-induced GRP78 induction and increases cell death upon reperfusion.","method":"Nuclear fractionation, EMSA/ChIP, ATF6 dominant-negative and miRNA knockdown, primary cardiac myocyte model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with loss-of-function and functional consequence","pmids":["19622751"],"is_preprint":false},{"year":2010,"finding":"ATF6 luminal tail contains the BiP-binding and ER-retention determinants for stress sensing and Golgi trafficking; in contrast to the related CREB-H whose ER retention depends on a cytoplasmic motif, transferring ATF6's luminal tail onto an ERM-deficient CREB-H chimera restores ER retention.","method":"Chimeric protein constructs, subcellular localization by fluorescence microscopy, BiP co-immunoprecipitation, S1P cleavage assays","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1–2 — domain-swap mutagenesis with biochemical and imaging validation","pmids":["19883396"],"is_preprint":false},{"year":2011,"finding":"The PERK/eIF2α/ATF4 integrated stress response pathway is required for both ATF6 protein synthesis and ATF6 trafficking from the ER to the Golgi for intramembrane proteolysis; liver-specific PERK depletion markedly reduces ATF6 activation and downstream chaperone expression.","method":"Liver-specific PERK knockout mice, pulse-chase protein synthesis, subcellular fractionation, immunoblot","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 — conditional KO mouse with mechanistic trafficking assays","pmids":["21917591"],"is_preprint":false},{"year":2015,"finding":"ACHM-associated ATF6 mutations define three mechanistic classes: class 1 impairs ER-to-Golgi trafficking and regulated intramembrane proteolysis; class 2 produces constitutively active cytosolic ATF6 with intact transcriptional activity even without ER stress; class 3 has complete loss of bZIP-dependent transcriptional activity. Patient fibroblasts with class 1 or 3 mutations show increased death under ER stress.","method":"Functional characterization of recombinant mutant ATF6 proteins, trafficking assays, reporter assays, patient-derived primary fibroblasts","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — comprehensive structure-function analysis with patient-derived cells, multiple mutations tested","pmids":["28028229"],"is_preprint":false},{"year":2015,"finding":"Loss-of-function mutations in ATF6 attenuate ATF6 transcriptional activity in response to ER stress and cause achromatopsia with foveal hypoplasia; Atf6-/- mice develop progressive rod and cone dysfunction, establishing ATF6 as essential for cone photoreceptor function and foveal development.","method":"Whole-exome sequencing, functional reporter assays of mutant ATF6, Atf6 knockout mouse ERG and retinal morphology","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1–2 — human genetics corroborated by knockout mouse phenotype and direct functional assays","pmids":["26029869"],"is_preprint":false},{"year":2016,"finding":"ATF6 activation in cardiac myocytes subjected to ischemia/reperfusion induces oxidative stress response genes (including catalase) by binding ER stress response elements in their promoters; ATF6 knockout mice show increased I/R damage and decreased catalase induction, while ATF6 overexpression or catalase overexpression restores protection.","method":"ATF6 knockout mice, I/R model, gene array, ChIP, promoter reporter assays, AAV9-mediated ATF6 overexpression","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1–2 — knockout mouse + ChIP + in vivo AAV rescue, multiple orthogonal methods","pmids":["27932512"],"is_preprint":false},{"year":2018,"finding":"ATF6 is activated by specific sphingolipids (dihydrosphingosine and dihydroceramide) through a transmembrane domain motif distinct from the luminal domain that senses proteotoxic stress; single mutations in this transmembrane motif abolish DHS/DHC activation while preserving proteotoxic stress activation.","method":"Site-directed mutagenesis of ATF6 transmembrane domain, lipid addition assays, pathway-selective reporters, fenretinide treatment of achromatopsia mutant ATF6","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis dissecting two mechanistically distinct activation pathways with orthogonal reporters","pmids":["30086303"],"is_preprint":false},{"year":2018,"finding":"ATF6 loss results in uncontrolled IRE1 upregulation and increased XBP1 splicing during ER stress; the transcriptionally active N-terminal ATF6 domain reverses IRE1 upregulation, identifying an ATF6-dependent 'off-switch' for IRE1 signaling.","method":"shRNA-mediated silencing, live-cell fluorescent UPR reporters, ATF6 N-terminal domain overexpression, IRE1 inhibition","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple reporter lines and perturbation experiments; single lab","pmids":["30287689"],"is_preprint":false},{"year":2019,"finding":"ATF6 disulfide-bonded oligomeric forms in the ER exist as two types of dimers (C467-dimer and C618-dimer); all forms including monomer are activated by single reduction of a disulfide bond in response to ER stress, with C618-dimer being more easily reduced, ensuring rapidity of ATF6α activation.","method":"ATF6α/ATF6β-deficient HCT116 cells, non-reducing SDS-PAGE, cysteine mutagenesis (C467A, C618A), disulfide bond analysis","journal":"Cell structure and function","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in defined genetic background with systematic mutagenesis","pmids":["31852864"],"is_preprint":false},{"year":2007,"finding":"ER stressors transcriptionally upregulate ATF6 mRNA through a positive feedback loop: the active p50-ATF6 fragment binds ATF6-binding elements in the ATF6 gene's own promoter; S1P inhibition blocks this upregulation.","method":"RT-PCR, mRNA stability assay, S1P inhibitor, promoter analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — pharmacological inhibitor + promoter analysis; single lab, limited mechanistic depth","pmids":["17307147"],"is_preprint":false},{"year":2015,"finding":"miR-424 directly targets the 3'UTR of ATF6 mRNA and attenuates ATF6 transcriptional activity during UPR; PERK-mediated downregulation of the miR-424(322)-503 cluster during ER stress de-represses ATF6, enabling optimal ATF6 activation.","method":"Luciferase 3'UTR reporter, PERK-deficient MEFs, selective PERK activator, IRE1 inhibitor, siRNA knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — 3'UTR reporter + genetic loss-of-function in PERK KO cells + pharmacological validation","pmids":["26674075"],"is_preprint":false},{"year":2021,"finding":"The E3 ubiquitin ligase RNF186 ubiquitinates ATF6 at K152 upon NOD2 stimulation in human macrophages, promoting UPR activation, cytokine secretion, and antimicrobial responses; RNF186 IBD risk variants reduce this ubiquitination and impair UPR-associated signaling. Atf6-deficient mice show reduced UPR in colonic tissues and impaired bacterial clearance.","method":"Co-immunoprecipitation, ubiquitination assays, site-directed mutagenesis (K152), ATF6 and RNF186 knockout mice, Salmonella challenge model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 — identified specific ubiquitination site, KO mice, human macrophage validation, multiple orthogonal methods","pmids":["34623328"],"is_preprint":false},{"year":2021,"finding":"The deubiquitinase OTUB1 stabilizes ATF6 by inhibiting its ubiquitylation in bladder cancer cells, thereby sustaining ATF6 signaling and transcriptional activity; OTUB1 ablation reduces ATF6-dependent transcription and impairs cancer cell proliferation.","method":"Luciferase pathway screening, co-immunoprecipitation, ubiquitylation assay, siRNA/CRISPR ablation, in vivo xenograft","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2–3 — biochemical ubiquitination assay + functional readout; single lab","pmids":["33686769"],"is_preprint":false},{"year":2018,"finding":"ATF6 suppresses cardiac fibroblast activation by the TGFβ-Smad pathway; ATF6 activation reduces fibroblast contraction and αSMA induction, while ATF6 silencing or deletion hyperactivates fibroblasts; in vivo ATF6 reduces cardiac fibrosis.","method":"ATF6 conditional knockout mice, siRNA silencing, TGFβ stimulation, contraction assay, αSMA immunostaining, Smad pathway analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO + siRNA with specific pathway readout; single lab","pmids":["32085622"],"is_preprint":false},{"year":2012,"finding":"ATF6 directly binds the DAPK1 gene promoter CRE/ATF site (in association with C/EBPβ) downstream of IFN-γ signaling; IFN-γ-stimulated proteolytic cleavage of ATF6 is required for DAPK1 expression and subsequent autophagy induction. Atf6-/- mice fail to induce autophagy in response to IFN-γ and are highly susceptible to lethal bacterial infections.","method":"ChIP, promoter reporter assays, Atf6 knockout mice, bacterial infection model, autophagy assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP + KO mouse + infection phenotype, multiple methods","pmids":["22874566"],"is_preprint":false},{"year":2015,"finding":"DKK3 activates ATF6 (as a secreted cytokine), leading to increased ATF6 binding to the myocardin promoter and upregulation of myocardin expression, driving smooth muscle cell differentiation from embryonic stem cells; ERK1/2 inhibition further promotes ATF6 expression and myocardin transcription.","method":"ChIP (ATF6 on myocardin promoter), reporter assays, overexpression, siRNA knockdown, ES cell differentiation model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + reporter assays; single lab, ES cell model","pmids":["26105053"],"is_preprint":false},{"year":2015,"finding":"ATF6 associates with Runx2 via co-immunoprecipitation and enhances Runx2-mediated chondrocyte hypertrophy and endochondral bone growth; overexpression of ATF6 accelerates chondrocyte differentiation while siRNA knockdown inhibits it; the promotive effect requires Runx2.","method":"Co-immunoprecipitation (ATF6–Runx2), siRNA knockdown, adenoviral overexpression, micromass cultures, fetal bone explants","journal":"Journal of orthopaedic surgery and research","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP + epistasis by Runx2 siRNA; single lab","pmids":["26374329"],"is_preprint":false},{"year":2015,"finding":"Runx2 transcriptionally activates the ATF6 gene through Runx2-binding elements in the ATF6 promoter, while Sox6 represses ATF6 expression; ATF6a (cleaved active form) acts as a co-factor of Runx2 to augment hypertrophic chondrocyte differentiation and modulates IHH/PTHrP signaling.","method":"Promoter reporter assays, ChIP, siRNA knockdown of Runx2/Sox6, adenoviral ATF6a overexpression, chondrogenesis assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + reporter assays + functional differentiation assays; single lab","pmids":["26527399"],"is_preprint":false},{"year":2018,"finding":"SIRT1 deacetylates and inactivates ATF6; ATF6 in turn can bind the SIRT1 promoter to regulate SIRT1 transcription, forming a feedback loop; SIRT1/ATF6-dependent mechanism controls lipid droplet accumulation in hepatocytes.","method":"ChIP, co-immunoprecipitation, proximity ligation assay, dual luciferase reporter, siRNA and overexpression of SIRT1 and ATF6","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + Co-IP + reporter assays; single lab","pmids":["30537742"],"is_preprint":false},{"year":2018,"finding":"ATF6 pharmacological activation (using small-molecule agonist AA147) in human iPSC-derived cells suppresses pluripotency and directs mesodermal cell fate differentiation; iPSCs from ATF6-mutant achromatopsia patients show impaired differentiation, demonstrating a developmental role for ATF6 beyond ER stress.","method":"Small-molecule ATF6 agonist activation, patient-derived ATF6-mutant iPSCs, germ-layer differentiation assays, transcriptomics","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — pharmacological activation + genetic loss-of-function (patient iPSCs) with developmental readout","pmids":["29440509"],"is_preprint":false},{"year":2020,"finding":"ATF6 shapes early CHOP dynamics during UPR; ATF6 siRNA knockdown alters CHOP induction kinetics, confirmed by dynamic mathematical modeling calibrated against single-cell fluorescence microscopy of BAC-GFP reporter lines.","method":"siRNA knockdown, BAC-GFP reporter cell lines, live microscopy, dynamic mathematical modeling","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative live-cell imaging + mathematical modeling + siRNA; single lab","pmids":["32058971"],"is_preprint":false},{"year":2018,"finding":"EDEM1 silencing stabilizes ATF6 protein and increases ATF6 export to the Golgi during ER stress, revealing that ATF6 is natively unstable and EDEM1 normally limits ATF6 bioavailability; an EDEM1 somatic variant (N198I) found in hepatocellular carcinoma alters ATF6 signaling.","method":"siRNA phenotypic screen, ATF6 protein stability assays, immunofluorescence of Golgi export","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2–3 — siRNA screen + biochemical stability and localization assays; single lab","pmids":["30281916"],"is_preprint":false},{"year":2021,"finding":"ATF6 is required for efficient clearance of misfolded P23H rhodopsin in rod photoreceptors; Atf6-/- mice carrying P23H rhodopsin accumulate elevated rhodopsin protein (not mRNA) at early ages and develop accelerated retinal degeneration, with compensatory IRE1 hyperactivation.","method":"Atf6 knockout crossed with P23H rhodopsin knock-in mice, immunoblot, qPCR, ERG, IRE1 pathway analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — genetic double-mutant mouse model with protein homeostasis and functional retinal readouts","pmids":["34381136"],"is_preprint":false},{"year":2018,"finding":"ATF6 directly induces transcription of the tPA gene (Plat) in hepatocytes; hepatocyte-specific ATF6 knockout mice show decreased liver tPA, circulating tPA, and fibrinolytic activity; DACH1 corepressor represses ATF6 to downregulate tPA, establishing an ATF6-tPA axis controlling systemic fibrinolysis.","method":"Hepatocyte-specific ATF6 and DACH1 knockout mice, ChIP, reporter assays, bleeding time/thrombosis assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — conditional KO mouse + ChIP + functional coagulation assays","pmids":["30504459"],"is_preprint":false},{"year":2021,"finding":"ATF6 interacts with the FGF2 promoter and promotes FGF2 transcription in chondrocytes; ATF6 inhibitor Ceapin-A7 blocks ATF6-FGF2-driven angiogenesis in vitro and angiogenesis-osteogenesis coupling in vivo in an ankylosing spondylitis model.","method":"ChIP (ATF6 on FGF2 promoter), reporter assays, ATF6 inhibitor Ceapin-A7, in vivo SKG mouse model","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + in vivo pharmacological inhibition; single lab","pmids":["34296071"],"is_preprint":false},{"year":2015,"finding":"Selective pharmacological activation of ATF6 preferentially reduces misfolded mutant rhodopsin (multiple RP-causing variants) with minimal effects on wild-type rhodopsin, demonstrating ATF6 activates a quality-control degradation program for misfolded ER clients.","method":"Inducible ATF6f expression system, wild-type vs. mutant rhodopsin co-expression, immunoblot","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 — inducible gain-of-function with multiple rhodopsin variants; single lab","pmids":["22956602"],"is_preprint":false},{"year":2020,"finding":"ATF6 promotes AIFM2 transcription by directly binding to both the p53 and AIFM2 gene promoters; ATF6 knockout in SAP mice attenuates acinar apoptosis and ER disorder, while AIFM2 overexpression can re-establish pathological features in ATF6-null SAP mice.","method":"ATF6 knockout mice (crossed with PRSS1 transgenic SAP model), ChIP-qPCR, luciferase reporter, adenovirus-mediated overexpression/knockdown, proteomics","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP + KO mouse rescue experiment + reporter assays with multiple orthogonal methods","pmids":["32724472"],"is_preprint":false},{"year":2014,"finding":"ATF6 translocates from cytoplasm to nucleus during odontoblast differentiation; ATF6 overexpression increases DSPP and DMP1 expression, alkaline phosphatase activity, and matrix mineralization; ATF6 inhibition decreases ALP activity, establishing ATF6 as a regulator of odontoblastic differentiation.","method":"Immunofluorescence/confocal microscopy (ATF6 translocation), adenoviral overexpression, siRNA inhibition, alizarin red staining, ALP assay","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 — gain and loss of function with specific differentiation readouts; single lab","pmids":["24570149"],"is_preprint":false},{"year":2022,"finding":"Pharmacological ATF6 activation increases assembly, trafficking, and surface expression of variant GABAA receptors by remodeling ER proteostasis, specifically upregulating BiP and the trafficking receptor LMAN1 and enhancing their interactions with GABAA receptor subunits.","method":"Small-molecule ATF6 activators, co-immunoprecipitation (BiP/LMAN1 with GABAA subunits), surface biotinylation, electrophysiology","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological + Co-IP + functional electrophysiology; single lab","pmids":["35477478"],"is_preprint":false},{"year":2015,"finding":"ATF6 binds the promoter of p50Atf6-responsive element in the osteocalcin (Bglap) gene; ChIP assay shows increased p50Atf6 binding to Bglap promoter upon MTA treatment; Atf6 shRNA knockdown abolishes MTA-induced mineralization, establishing an ATF6–osteocalcin axis in osteoblastogenesis.","method":"ChIP, luciferase reporter, Tet-on shRNA Atf6 knockdown, mineralization assay","journal":"Bone reports","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + loss-of-function with functional readout; single lab","pmids":["28377952"],"is_preprint":false},{"year":2022,"finding":"ATF6 pharmacological activation by small-molecule activators corrects folding and increases neutrophil elastase inhibitory activity of most alpha-1-antitrypsin deficiency variants (including Z-AAT), reducing polymer accumulation; machine learning identified the 'gate' area as an unexpected ATF6-responsive region.","method":"Pharmacological ATF6 activators (AA147), NE inhibition assay, polymer ELISA, Gaussian process machine learning across 71 AATD variants","journal":"Cell chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological activation with functional biochemical readouts across many variants; single lab","pmids":["36630963"],"is_preprint":false}],"current_model":"ATF6 is an ER-resident type II transmembrane bZIP transcription factor that is normally retained in the ER through BiP binding and disulfide-bonded dimerization; upon ER stress (or sphingolipid signals via its transmembrane domain), disulfide bonds are reduced, BiP dissociates, and ATF6 traffics to the Golgi where it is sequentially cleaved by SKI-1/S1P and S2P to release a ~50 kDa N-terminal fragment (p50ATF6) that translocates to the nucleus, binds ERSE/ERSE-II elements (requiring NF-Y as a co-factor) to drive transcription of ER chaperones (BiP/GRP78), ERAD components, and XBP1 mRNA (which is then spliced by IRE1 to a potent activator), and also contains a VP16-like VN8 domain that simultaneously mediates potent transcriptional activation and rapid proteasomal self-degradation; ATF6 activity is post-translationally regulated by ubiquitination (RNF186 promotes, OTUB1 stabilizes) and by SIRT1-mediated deacetylation, and its downstream transcriptional programs extend beyond ER proteostasis to include oxidative stress defense genes (catalase), fibrinolysis (tPA/Plat), and developmental gene programs (myocardin, osteocalcin, FGF2) relevant to cardiac, bone, retinal, and vascular biology."},"narrative":{"teleology":[{"year":1997,"claim":"ATF6 was first identified as a bZIP transcription factor that physically associates with SRF and contributes to serum-induced gene expression, establishing it as a nuclear transcriptional co-activator before its ER-stress role was known.","evidence":"Yeast two-hybrid, in vitro binding, reporter assays with ATF6-VP16 chimera and antisense ATF6","pmids":["9271374"],"confidence":"Medium","gaps":["SRF interaction was not followed up in the context of later UPR studies","physiological relevance of ATF6-SRF axis unclear"]},{"year":2000,"claim":"The discovery that ATF6 undergoes stress-induced proteolytic cleavage to generate a soluble nuclear form that activates ERSE-dependent transcription in partnership with NF-Y redefined ATF6 as a transmembrane ER-stress sensor rather than a conventional transcription factor.","evidence":"Biochemical fractionation, immunofluorescence, reporter assays, ERSE mutagenesis, co-IP with YY1","pmids":["10866666"],"confidence":"High","gaps":["Identity of the protease(s) performing cleavage was not yet established","mechanism of ER retention was unknown"]},{"year":2002,"claim":"Identification of S1P and S2P as the sequential Golgi proteases generating p50ATF6, together with evidence that BiP dissociation from the ATF6 luminal domain permits ER-to-Golgi trafficking, established the complete regulated intramembrane proteolysis (RIP) activation mechanism and the BiP-based stress-sensing model.","evidence":"S2P-deficient CHO cells, nuclear fractionation, reporter assays, BiP co-IP and transport studies","pmids":["11850408","12110159"],"confidence":"High","gaps":["Whether additional ER-retention mechanisms exist beyond BiP binding","redox regulation of ATF6 not yet addressed"]},{"year":2002,"claim":"Characterization of the VN8 domain in the ATF6 N-terminus revealed a dual-function motif coupling transcriptional activation to rapid proteasomal degradation, explaining the transient nature of ATF6 signaling and linking it to ATF6 and XBP1 mRNA induction as convergent UPR outputs.","evidence":"Deletion/point mutagenesis, proteasome inhibitor treatment, pulse-chase; XBP1 splicing assays in IRE1α-null MEFs and S2P-deficient CHO cells","pmids":["11909875","11779464","11850408"],"confidence":"High","gaps":["Ubiquitin ligase mediating VN8-dependent degradation was not identified","structural basis of VN8 activity unknown"]},{"year":2004,"claim":"Dissection of three distinct cis-elements (ERSE, ERSE-II, UPRE) clarified the division of labor between ATF6 and XBP1: ATF6 is sufficient for BiP/ERSE induction via NF-Y, while ERSE-II targets require both ATF6 and XBP1, and UPRE elements are XBP1-exclusive.","evidence":"XBP1-null MEFs, reporter assays, EMSA, NF-Y interaction analysis","pmids":["15598891"],"confidence":"High","gaps":["Genome-wide mapping of ATF6-specific vs. shared targets not performed","chromatin context effects not addressed"]},{"year":2008,"claim":"VAPB was identified as a physical interactor that attenuates ATF6 transcriptional output, with the ALS-linked P56S mutant acting as a more potent inhibitor, providing a link between ATF6 regulation and neurodegenerative disease.","evidence":"Co-immunoprecipitation, reporter assays with wild-type and P56S VAPB overexpression","pmids":["18263603"],"confidence":"Medium","gaps":["Mechanism by which VAPB suppresses ATF6 (retention, degradation?) is unresolved","no reciprocal validation or endogenous-level evidence"]},{"year":2009,"claim":"Demonstration that simulated ischemia activates ATF6 to induce GRP78 in cardiac myocytes, with dominant-negative ATF6 increasing ischemia/reperfusion cell death, established ATF6 as a cardioprotective effector beyond canonical ER-stress paradigms.","evidence":"Nuclear fractionation, EMSA/ChIP on GRP78 promoter, ATF6 dominant-negative and miRNA knockdown in primary cardiac myocytes","pmids":["19622751"],"confidence":"High","gaps":["Full complement of cardiac ATF6 target genes not identified","in vivo cardiac phenotype of ATF6 loss not yet tested"]},{"year":2010,"claim":"Domain-swap experiments showed the ATF6 luminal tail is both necessary and sufficient for BiP-dependent ER retention and stress-regulated Golgi trafficking, distinguishing ATF6 from related ER-tethered transcription factors like CREB-H.","evidence":"Chimeric ATF6/CREB-H constructs, fluorescence microscopy, BiP co-IP, S1P cleavage assays","pmids":["19883396"],"confidence":"High","gaps":["Whether glycosylation or other post-translational modifications of the luminal tail contribute to retention"]},{"year":2011,"claim":"The PERK/eIF2α/ATF4 pathway was shown to be required for both ATF6 protein synthesis and ATF6 trafficking to the Golgi, revealing cross-talk between two UPR branches at the level of ATF6 activation.","evidence":"Liver-specific PERK knockout mice, pulse-chase, subcellular fractionation","pmids":["21917591"],"confidence":"High","gaps":["Whether PERK regulates ATF6 trafficking directly or via ATF4-induced gene products"]},{"year":2012,"claim":"ATF6 was found to directly bind the DAPK1 promoter downstream of IFN-γ signaling, driving autophagy induction; Atf6-knockout mice showed impaired autophagy and lethal susceptibility to bacterial infection, establishing ATF6 in innate immune defense.","evidence":"ChIP, promoter reporters, Atf6 KO mice with bacterial infection model, autophagy assays","pmids":["22874566"],"confidence":"High","gaps":["Whether ATF6 cleaves in response to IFN-γ via canonical BiP-dependent mechanism or a distinct pathway"]},{"year":2015,"claim":"Multiple independent studies established ATF6 as a transcriptional regulator of developmental and differentiation programs — driving myocardin in smooth muscle differentiation, osteocalcin in osteoblastogenesis, and Runx2-dependent chondrocyte hypertrophy — extending ATF6 function well beyond ER-stress proteostasis.","evidence":"ChIP on myocardin/osteocalcin/ATF6 promoters, reporter assays, Runx2 co-IP, ES cell and chondrocyte differentiation models, siRNA and overexpression","pmids":["26105053","28377952","26374329","26527399"],"confidence":"Medium","gaps":["Whether developmental ATF6 activation uses the same S1P/S2P cleavage mechanism","no single integrated model connecting ATF6 to differentiation signal transduction"]},{"year":2015,"claim":"Loss-of-function ATF6 mutations were identified as causative for achromatopsia with foveal hypoplasia, validated by attenuated UPR transcription in mutant assays and progressive photoreceptor dysfunction in Atf6-knockout mice, establishing ATF6 as essential for human cone photoreceptor development.","evidence":"Whole-exome sequencing of ACHM families, functional reporter assays, Atf6 KO mouse ERG and retinal morphology; subsequent classification of mutations into three mechanistic classes","pmids":["26029869","28028229"],"confidence":"High","gaps":["Precise developmental window requiring ATF6 in cone specification not defined","whether sphingolipid-mediated ATF6 activation is relevant to retinal phenotype"]},{"year":2016,"claim":"ATF6 was shown to transcriptionally induce catalase and other oxidative stress defense genes by binding ERSE elements in their promoters; ATF6 KO mice had increased cardiac ischemia/reperfusion damage rescued by catalase overexpression, demonstrating ATF6 controls an antioxidant program beyond classical chaperone induction.","evidence":"ATF6 KO mice, I/R model, ChIP, gene array, AAV9-mediated ATF6 overexpression rescue","pmids":["27932512"],"confidence":"High","gaps":["Whether the antioxidant program is ATF6-specific or shared with ATF6β"]},{"year":2018,"claim":"Discovery that sphingolipids (DHS/DHC) activate ATF6 through a transmembrane domain motif mechanistically distinct from the luminal proteotoxic stress-sensing pathway revealed a second, lipid-based activation mode and provided a druggable therapeutic strategy for ATF6-deficient achromatopsia.","evidence":"Site-directed TM domain mutagenesis, lipid addition, pathway-selective reporters, fenretinide treatment of ACHM mutant ATF6","pmids":["30086303"],"confidence":"High","gaps":["Structural basis of sphingolipid-TM domain interaction unknown","whether lipid sensing operates through altered ATF6 oligomerization"]},{"year":2018,"claim":"ATF6 was identified as an 'off-switch' for IRE1: ATF6 loss leads to uncontrolled IRE1 upregulation and XBP1 hyper-splicing, revealing ATF6-dependent negative feedback within the UPR that limits IRE1 signaling duration.","evidence":"shRNA knockdown, live-cell fluorescent UPR reporters, ATF6 N-terminal domain rescue","pmids":["30287689"],"confidence":"Medium","gaps":["Target gene(s) through which ATF6 suppresses IRE1 not identified","single-lab finding awaiting independent confirmation"]},{"year":2018,"claim":"Hepatocyte-specific ATF6 knockout demonstrated that ATF6 directly drives tPA (Plat) transcription, controlling systemic fibrinolytic capacity, while pharmacological ATF6 activation in iPSCs suppresses pluripotency and directs mesodermal differentiation, confirming non-proteostatic developmental roles.","evidence":"Hepatocyte-specific ATF6 KO mice, ChIP, bleeding/thrombosis assays; ATF6 agonist AA147 treatment of iPSCs and ACHM patient iPSCs, transcriptomics","pmids":["30504459","29440509"],"confidence":"High","gaps":["Whether hepatic tPA regulation requires BiP-dependent ATF6 activation or basal ATF6 activity","iPSC differentiation effects not validated in vivo"]},{"year":2019,"claim":"Resolution of ATF6 disulfide-bonded oligomeric states (C467-dimer and C618-dimer) and demonstration that single disulfide reduction suffices for activation, with C618-dimers being more readily reduced, provided a molecular explanation for the rapidity and sensitivity of ATF6 stress sensing.","evidence":"ATF6α/ATF6β-deficient HCT116 cells, non-reducing SDS-PAGE, systematic cysteine mutagenesis","pmids":["31852864"],"confidence":"High","gaps":["Identity of the reductase(s) acting on ATF6 disulfides in vivo","whether redox and BiP-dissociation sensing are coupled or independent"]},{"year":2021,"claim":"Identification of RNF186-mediated ubiquitination at K152 as an activating signal for ATF6 downstream of NOD2 in macrophages, and OTUB1 as a stabilizing deubiquitinase, established ubiquitin-dependent post-translational regulation of ATF6; RNF186 IBD risk variants impair this axis, linking ATF6 to inflammatory bowel disease susceptibility.","evidence":"Ubiquitination assays with K152 mutagenesis, RNF186 and ATF6 KO mice, Salmonella challenge; OTUB1 CRISPR ablation, xenograft model","pmids":["34623328","33686769"],"confidence":"High","gaps":["Whether RNF186-mediated ubiquitination promotes ATF6 trafficking or cleavage specifically","whether OTUB1 acts directly on ATF6 or through an intermediary E3 ligase"]},{"year":2021,"claim":"ATF6 was shown to be required for efficient clearance of misfolded P23H rhodopsin, with Atf6 loss leading to protein accumulation and accelerated retinal degeneration, directly connecting ATF6's ERAD-enhancing transcriptional program to in vivo photoreceptor proteostasis.","evidence":"Atf6 KO × P23H rhodopsin knock-in mice, immunoblot, qPCR, ERG, IRE1 pathway analysis","pmids":["34381136"],"confidence":"High","gaps":["Specific ERAD components upregulated by ATF6 in photoreceptors not identified","whether pharmacological ATF6 activation can rescue P23H degeneration"]},{"year":2022,"claim":"Pharmacological ATF6 activation was demonstrated to enhance ER proteostasis broadly — correcting folding of GABAA receptor variants and alpha-1-antitrypsin deficiency variants — validating ATF6 as a druggable target for conformational diseases beyond the retina.","evidence":"Small-molecule ATF6 activators (AA147), surface biotinylation, electrophysiology (GABAA); NE inhibition assays, polymer ELISA across 71 AATD variants with machine learning","pmids":["35477478","36630963"],"confidence":"Medium","gaps":["Long-term effects of sustained pharmacological ATF6 activation on ER homeostasis unknown","whether ATF6 activation exerts proteotoxic stress in non-disease cells at therapeutic doses"]},{"year":null,"claim":"Key unresolved questions include the structural basis of the dual (luminal proteotoxic vs. transmembrane lipid) activation modes, the identity of the reductase(s) acting on ATF6 disulfide bonds, the full genome-wide target spectrum distinguishing ATF6α from ATF6β, and whether pharmacological ATF6 modulation can treat achromatopsia, IBD, or conformational diseases in human patients.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of full-length ATF6","ATF6α vs. ATF6β target gene specificity not systematically resolved","clinical translation of ATF6 agonists not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,7,10,15,24,25,33,34,36,39]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,5,6,7,10,13,14,15,29]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,4,11,16,18]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3,8,11,16]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,5,6,10,37]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,1,3,4,7,12,15,17,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,5,7,13,14,15,33]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,5,21,22,31]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[24]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21,24]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[14,25,26,27,29]}],"complexes":[],"partners":["HSPA5","MBTPS1","MBTPS2","NFYA","RNF186","OTUB1","RUNX2","VAPB"],"other_free_text":[]},"mechanistic_narrative":"ATF6 is an ER-resident type II transmembrane bZIP transcription factor that serves as a central sensor and effector of the unfolded protein response (UPR), integrating ER proteostasis with diverse developmental and stress-adaptive transcriptional programs. Under basal conditions, ATF6 is retained in the ER through BiP binding to its luminal domain and inter-chain disulfide bonds (C467 and C618); upon ER stress, disulfide reduction and BiP dissociation permit trafficking to the Golgi, where sequential cleavage by S1P/SKI-1 and S2P releases the ~50 kDa N-terminal fragment (p50ATF6) that translocates to the nucleus and activates ERSE- and ERSE-II-containing promoters in cooperation with NF-Y, driving expression of ER chaperones (BiP/GRP78), XBP1 mRNA, ERAD components, and oxidative stress defense genes such as catalase [PMID:10866666, PMID:11850408, PMID:14970232, PMID:31852864, PMID:27932512]. ATF6 is additionally activated through its transmembrane domain by sphingolipids (dihydrosphingosine/dihydroceramide), independently of the luminal proteotoxic stress-sensing mechanism, and its activity is post-translationally tuned by RNF186-mediated K152 ubiquitination, OTUB1-mediated deubiquitination, and SIRT1-mediated deacetylation [PMID:30086303, PMID:34623328, PMID:33686769, PMID:30537742]. Loss-of-function mutations in ATF6 cause achromatopsia with foveal hypoplasia, and ATF6 transcriptional targets extend beyond ER proteostasis to include tPA (systemic fibrinolysis), DAPK1 (IFN-γ-induced autophagy and antimicrobial defense), myocardin (smooth muscle differentiation), and osteocalcin, reflecting essential roles in retinal, cardiac, hepatic, immune, and skeletal biology [PMID:26029869, PMID:30504459, PMID:22874566, PMID:26105053, PMID:28377952]."},"prefetch_data":{"uniprot":{"accession":"P18850","full_name":"Cyclic AMP-dependent transcription factor ATF-6 alpha","aliases":["Activating transcription factor 6 alpha","ATF6-alpha"],"length_aa":670,"mass_kda":74.6,"function":"Precursor of the transcription factor form (Processed cyclic AMP-dependent transcription factor ATF-6 alpha), which is embedded in the endoplasmic reticulum membrane (PubMed:10564271, PubMed:11158310, PubMed:11779464). Endoplasmic reticulum stress promotes processing of this form, releasing the transcription factor form that translocates into the nucleus, where it activates transcription of genes involved in the unfolded protein response (UPR) (PubMed:10564271, PubMed:11158310, PubMed:11779464) Transcription factor that initiates the unfolded protein response (UPR) during endoplasmic reticulum stress by activating transcription of genes involved in the UPR (PubMed:10564271, PubMed:11158310, PubMed:11163209, PubMed:11779464). Binds DNA on the 5'-CCAC[GA]-3'half of the ER stress response element (ERSE) (5'-CCAAT-N(9)-CCAC[GA]-3') and of ERSE II (5'-ATTGG-N-CCACG-3') (PubMed:10564271, PubMed:11158310, PubMed:11779464). Binding to ERSE requires binding of NF-Y to ERSE. Could also be involved in activation of transcription by the serum response factor (PubMed:10564271, PubMed:11158310, PubMed:11779464). May play a role in foveal development and cone function in the retina (PubMed:26029869)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P18850/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATF6","classification":"Not Classified","n_dependent_lines":17,"n_total_lines":1208,"dependency_fraction":0.014072847682119206},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ATF6","total_profiled":1310},"omim":[{"mim_id":"620875","title":"FIC DOMAIN-CONTAINING PROTEIN ADENYLYLTRANSFERASE; FICD","url":"https://www.omim.org/entry/620875"},{"mim_id":"620158","title":"SPINOCEREBELLAR ATAXIA 50; SCA50","url":"https://www.omim.org/entry/620158"},{"mim_id":"616942","title":"PROTEIN DISULFIDE ISOMERASE, FAMILY A, MEMBER 5; PDIA5","url":"https://www.omim.org/entry/616942"},{"mim_id":"616517","title":"ACHROMATOPSIA 7; ACHM7","url":"https://www.omim.org/entry/616517"},{"mim_id":"616215","title":"cAMP RESPONSE ELEMENT-BINDING PROTEIN 3-LIKE 1; CREB3L1","url":"https://www.omim.org/entry/616215"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Nucleoli fibrillar center","reliability":"Additional"},{"location":"Endoplasmic reticulum","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Primary cilium tip","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ATF6"},"hgnc":{"alias_symbol":["ATF6A","ATP6alpha"],"prev_symbol":[]},"alphafold":{"accession":"P18850","domains":[{"cath_id":"-","chopping":"560-599_613-620","consensus_level":"medium","plddt":88.93,"start":560,"end":620},{"cath_id":"1.20.5","chopping":"304-372","consensus_level":"medium","plddt":94.0245,"start":304,"end":372}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P18850","model_url":"https://alphafold.ebi.ac.uk/files/AF-P18850-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P18850-F1-predicted_aligned_error_v6.png","plddt_mean":55.22},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ATF6","jax_strain_url":"https://www.jax.org/strain/search?query=ATF6"},"sequence":{"accession":"P18850","fasta_url":"https://rest.uniprot.org/uniprotkb/P18850.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P18850/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P18850"}},"corpus_meta":[{"pmid":"11779464","id":"PMC_11779464","title":"XBP1 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splicing assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods, replicated across two labs (PMID:11779464 and PMID:11850408)\",\n      \"pmids\": [\"11779464\", \"11850408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ATF6 activates the ER stress response element (ERSE) as a transcription factor; upon ER stress (thapsigargin), ATF6 undergoes proteolytic cleavage to generate a faster-migrating soluble nuclear form that drives ERSE-dependent transcription. Optimal activation requires NF-Y binding to ERSE and YY1 interacts with ATF6 to enhance its activity.\",\n      \"method\": \"Biochemical fractionation, immunofluorescence, reporter/luciferase assays, co-immunoprecipitation (YY1–ATF6), mutagenesis of ERSE\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods in a single rigorous paper with functional validation\",\n      \"pmids\": [\"10866666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ATF6, a bZIP protein, physically interacts with the transcriptional activation domain of serum response factor (SRF); ATF6-VP16 chimera activates SRE reporters and antisense ATF6 reduces serum-induced c-fos expression, placing ATF6 as a co-activator in SRF-mediated transcription.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro binding assay, reporter assay, antisense construct\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — yeast interaction + in vitro binding + reporter assay, single lab\",\n      \"pmids\": [\"9271374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ATF6 is cleaved at the Golgi by Site-1 protease (S1P) and Site-2 protease (S2P), generating the active N-terminal p50ATF6 fragment that translocates to the nucleus to activate UPR target genes; S2P-deficient CHO cells fail to cleave ATF6 or activate downstream UPR transcription.\",\n      \"method\": \"S2P-deficient CHO cell genetic system, immunoblot, nuclear fractionation, reporter assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic loss-of-function with defined biochemical readout, replicated\",\n      \"pmids\": [\"11850408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"BiP (GRP78) dissociation from ATF6's luminal domain initiates ATF6 transport to the Golgi for proteolytic activation; BiP binding retains ATF6 in the ER and senses the ER folding capacity.\",\n      \"method\": \"Commentary on co-immunoprecipitation and transport studies showing BiP–ATF6 interaction and its stress-regulated release\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic model supported by biochemical evidence reviewed in this paper; foundational concept replicated widely\",\n      \"pmids\": [\"12110159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The N-terminal 93 amino acids of ATF6 contain a VP16-homologous VN8-like domain required for both transcriptional activation and rapid proteasomal degradation of ATF6; point mutations in VN8 abolish transcription and increase ATF6 half-life.\",\n      \"method\": \"Deletion and point mutant constructs, reporter assays, proteasome inhibitor treatment, pulse-chase\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-function mutagenesis with multiple readouts in a single rigorous paper\",\n      \"pmids\": [\"11909875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Nitric oxide-induced ER stress causes proteolytic cleavage of p90ATF6 to p50ATF6, which translocates to the nucleus and binds the ERSE of the CHOP gene, driving CHOP expression and apoptosis in macrophages; overexpression of p50ATF6 alone induces cell death reversed by dominant-negative CHOP.\",\n      \"method\": \"Immunoblot, nuclear fractionation, EMSA, reporter assay, transfection with p90/p50ATF6 expression plasmids, CHOP-knockout macrophages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal approaches including genetic KO validation\",\n      \"pmids\": [\"11805088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATF6 differentially activates ERSE (requiring NF-Y), UPRE (does not bind ATF6; XBP1-dependent), and ERSE-II (NF-Y-dependent ATF6 binding plus NF-Y-independent XBP1 binding); ATF6 alone is sufficient to drive BiP/ERSE transcription without XBP1, while Herp/ERSE-II induction requires both.\",\n      \"method\": \"XBP1-null MEFs, reporter assays, EMSA, NF-Y interaction assays\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic null cells + biochemical binding assays + reporters\",\n      \"pmids\": [\"15598891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SKI-1/S1P is the first protease that cleaves ATF6 at the Golgi; protein-based inhibitors (alpha-1-antitrypsin variants and prosegment mutant R134E) block SKI-1 and reduce ATF6 processing by >55%, forming SDS-stable complexes with SKI-1.\",\n      \"method\": \"Transient transfection, stable cell lines, immunoblot of SREBP-2 and ATF6 processing, SDS-PAGE complex formation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct enzymatic inhibition with defined protein-based inhibitors and biochemical readout\",\n      \"pmids\": [\"14970232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VAPB (and VAPA) MSP domain physically interacts with ATF6; overexpression of VAPB or the ALS-associated VAPB-P56S mutant attenuates ATF6-regulated transcription, with VAPB-P56S being a more potent inhibitor.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, overexpression of VAPB/VAPB(P56S)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP plus functional reporter; single lab\",\n      \"pmids\": [\"18263603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Simulated ischemia activates ATF6 in cardiac myocytes, causing its translocation from ER to nucleus where it binds an ERSE in the GRP78 promoter to drive GRP78 expression; dominant-negative ATF6 or ATF6-targeted miRNA blocks ischemia-induced GRP78 induction and increases cell death upon reperfusion.\",\n      \"method\": \"Nuclear fractionation, EMSA/ChIP, ATF6 dominant-negative and miRNA knockdown, primary cardiac myocyte model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with loss-of-function and functional consequence\",\n      \"pmids\": [\"19622751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ATF6 luminal tail contains the BiP-binding and ER-retention determinants for stress sensing and Golgi trafficking; in contrast to the related CREB-H whose ER retention depends on a cytoplasmic motif, transferring ATF6's luminal tail onto an ERM-deficient CREB-H chimera restores ER retention.\",\n      \"method\": \"Chimeric protein constructs, subcellular localization by fluorescence microscopy, BiP co-immunoprecipitation, S1P cleavage assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — domain-swap mutagenesis with biochemical and imaging validation\",\n      \"pmids\": [\"19883396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The PERK/eIF2α/ATF4 integrated stress response pathway is required for both ATF6 protein synthesis and ATF6 trafficking from the ER to the Golgi for intramembrane proteolysis; liver-specific PERK depletion markedly reduces ATF6 activation and downstream chaperone expression.\",\n      \"method\": \"Liver-specific PERK knockout mice, pulse-chase protein synthesis, subcellular fractionation, immunoblot\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — conditional KO mouse with mechanistic trafficking assays\",\n      \"pmids\": [\"21917591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ACHM-associated ATF6 mutations define three mechanistic classes: class 1 impairs ER-to-Golgi trafficking and regulated intramembrane proteolysis; class 2 produces constitutively active cytosolic ATF6 with intact transcriptional activity even without ER stress; class 3 has complete loss of bZIP-dependent transcriptional activity. Patient fibroblasts with class 1 or 3 mutations show increased death under ER stress.\",\n      \"method\": \"Functional characterization of recombinant mutant ATF6 proteins, trafficking assays, reporter assays, patient-derived primary fibroblasts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — comprehensive structure-function analysis with patient-derived cells, multiple mutations tested\",\n      \"pmids\": [\"28028229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss-of-function mutations in ATF6 attenuate ATF6 transcriptional activity in response to ER stress and cause achromatopsia with foveal hypoplasia; Atf6-/- mice develop progressive rod and cone dysfunction, establishing ATF6 as essential for cone photoreceptor function and foveal development.\",\n      \"method\": \"Whole-exome sequencing, functional reporter assays of mutant ATF6, Atf6 knockout mouse ERG and retinal morphology\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — human genetics corroborated by knockout mouse phenotype and direct functional assays\",\n      \"pmids\": [\"26029869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ATF6 activation in cardiac myocytes subjected to ischemia/reperfusion induces oxidative stress response genes (including catalase) by binding ER stress response elements in their promoters; ATF6 knockout mice show increased I/R damage and decreased catalase induction, while ATF6 overexpression or catalase overexpression restores protection.\",\n      \"method\": \"ATF6 knockout mice, I/R model, gene array, ChIP, promoter reporter assays, AAV9-mediated ATF6 overexpression\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — knockout mouse + ChIP + in vivo AAV rescue, multiple orthogonal methods\",\n      \"pmids\": [\"27932512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 is activated by specific sphingolipids (dihydrosphingosine and dihydroceramide) through a transmembrane domain motif distinct from the luminal domain that senses proteotoxic stress; single mutations in this transmembrane motif abolish DHS/DHC activation while preserving proteotoxic stress activation.\",\n      \"method\": \"Site-directed mutagenesis of ATF6 transmembrane domain, lipid addition assays, pathway-selective reporters, fenretinide treatment of achromatopsia mutant ATF6\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis dissecting two mechanistically distinct activation pathways with orthogonal reporters\",\n      \"pmids\": [\"30086303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 loss results in uncontrolled IRE1 upregulation and increased XBP1 splicing during ER stress; the transcriptionally active N-terminal ATF6 domain reverses IRE1 upregulation, identifying an ATF6-dependent 'off-switch' for IRE1 signaling.\",\n      \"method\": \"shRNA-mediated silencing, live-cell fluorescent UPR reporters, ATF6 N-terminal domain overexpression, IRE1 inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple reporter lines and perturbation experiments; single lab\",\n      \"pmids\": [\"30287689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATF6 disulfide-bonded oligomeric forms in the ER exist as two types of dimers (C467-dimer and C618-dimer); all forms including monomer are activated by single reduction of a disulfide bond in response to ER stress, with C618-dimer being more easily reduced, ensuring rapidity of ATF6α activation.\",\n      \"method\": \"ATF6α/ATF6β-deficient HCT116 cells, non-reducing SDS-PAGE, cysteine mutagenesis (C467A, C618A), disulfide bond analysis\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in defined genetic background with systematic mutagenesis\",\n      \"pmids\": [\"31852864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ER stressors transcriptionally upregulate ATF6 mRNA through a positive feedback loop: the active p50-ATF6 fragment binds ATF6-binding elements in the ATF6 gene's own promoter; S1P inhibition blocks this upregulation.\",\n      \"method\": \"RT-PCR, mRNA stability assay, S1P inhibitor, promoter analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pharmacological inhibitor + promoter analysis; single lab, limited mechanistic depth\",\n      \"pmids\": [\"17307147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-424 directly targets the 3'UTR of ATF6 mRNA and attenuates ATF6 transcriptional activity during UPR; PERK-mediated downregulation of the miR-424(322)-503 cluster during ER stress de-represses ATF6, enabling optimal ATF6 activation.\",\n      \"method\": \"Luciferase 3'UTR reporter, PERK-deficient MEFs, selective PERK activator, IRE1 inhibitor, siRNA knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — 3'UTR reporter + genetic loss-of-function in PERK KO cells + pharmacological validation\",\n      \"pmids\": [\"26674075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The E3 ubiquitin ligase RNF186 ubiquitinates ATF6 at K152 upon NOD2 stimulation in human macrophages, promoting UPR activation, cytokine secretion, and antimicrobial responses; RNF186 IBD risk variants reduce this ubiquitination and impair UPR-associated signaling. Atf6-deficient mice show reduced UPR in colonic tissues and impaired bacterial clearance.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, site-directed mutagenesis (K152), ATF6 and RNF186 knockout mice, Salmonella challenge model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — identified specific ubiquitination site, KO mice, human macrophage validation, multiple orthogonal methods\",\n      \"pmids\": [\"34623328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The deubiquitinase OTUB1 stabilizes ATF6 by inhibiting its ubiquitylation in bladder cancer cells, thereby sustaining ATF6 signaling and transcriptional activity; OTUB1 ablation reduces ATF6-dependent transcription and impairs cancer cell proliferation.\",\n      \"method\": \"Luciferase pathway screening, co-immunoprecipitation, ubiquitylation assay, siRNA/CRISPR ablation, in vivo xenograft\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — biochemical ubiquitination assay + functional readout; single lab\",\n      \"pmids\": [\"33686769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 suppresses cardiac fibroblast activation by the TGFβ-Smad pathway; ATF6 activation reduces fibroblast contraction and αSMA induction, while ATF6 silencing or deletion hyperactivates fibroblasts; in vivo ATF6 reduces cardiac fibrosis.\",\n      \"method\": \"ATF6 conditional knockout mice, siRNA silencing, TGFβ stimulation, contraction assay, αSMA immunostaining, Smad pathway analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + siRNA with specific pathway readout; single lab\",\n      \"pmids\": [\"32085622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ATF6 directly binds the DAPK1 gene promoter CRE/ATF site (in association with C/EBPβ) downstream of IFN-γ signaling; IFN-γ-stimulated proteolytic cleavage of ATF6 is required for DAPK1 expression and subsequent autophagy induction. Atf6-/- mice fail to induce autophagy in response to IFN-γ and are highly susceptible to lethal bacterial infections.\",\n      \"method\": \"ChIP, promoter reporter assays, Atf6 knockout mice, bacterial infection model, autophagy assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP + KO mouse + infection phenotype, multiple methods\",\n      \"pmids\": [\"22874566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DKK3 activates ATF6 (as a secreted cytokine), leading to increased ATF6 binding to the myocardin promoter and upregulation of myocardin expression, driving smooth muscle cell differentiation from embryonic stem cells; ERK1/2 inhibition further promotes ATF6 expression and myocardin transcription.\",\n      \"method\": \"ChIP (ATF6 on myocardin promoter), reporter assays, overexpression, siRNA knockdown, ES cell differentiation model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + reporter assays; single lab, ES cell model\",\n      \"pmids\": [\"26105053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ATF6 associates with Runx2 via co-immunoprecipitation and enhances Runx2-mediated chondrocyte hypertrophy and endochondral bone growth; overexpression of ATF6 accelerates chondrocyte differentiation while siRNA knockdown inhibits it; the promotive effect requires Runx2.\",\n      \"method\": \"Co-immunoprecipitation (ATF6–Runx2), siRNA knockdown, adenoviral overexpression, micromass cultures, fetal bone explants\",\n      \"journal\": \"Journal of orthopaedic surgery and research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP + epistasis by Runx2 siRNA; single lab\",\n      \"pmids\": [\"26374329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Runx2 transcriptionally activates the ATF6 gene through Runx2-binding elements in the ATF6 promoter, while Sox6 represses ATF6 expression; ATF6a (cleaved active form) acts as a co-factor of Runx2 to augment hypertrophic chondrocyte differentiation and modulates IHH/PTHrP signaling.\",\n      \"method\": \"Promoter reporter assays, ChIP, siRNA knockdown of Runx2/Sox6, adenoviral ATF6a overexpression, chondrogenesis assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + reporter assays + functional differentiation assays; single lab\",\n      \"pmids\": [\"26527399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SIRT1 deacetylates and inactivates ATF6; ATF6 in turn can bind the SIRT1 promoter to regulate SIRT1 transcription, forming a feedback loop; SIRT1/ATF6-dependent mechanism controls lipid droplet accumulation in hepatocytes.\",\n      \"method\": \"ChIP, co-immunoprecipitation, proximity ligation assay, dual luciferase reporter, siRNA and overexpression of SIRT1 and ATF6\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + Co-IP + reporter assays; single lab\",\n      \"pmids\": [\"30537742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 pharmacological activation (using small-molecule agonist AA147) in human iPSC-derived cells suppresses pluripotency and directs mesodermal cell fate differentiation; iPSCs from ATF6-mutant achromatopsia patients show impaired differentiation, demonstrating a developmental role for ATF6 beyond ER stress.\",\n      \"method\": \"Small-molecule ATF6 agonist activation, patient-derived ATF6-mutant iPSCs, germ-layer differentiation assays, transcriptomics\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological activation + genetic loss-of-function (patient iPSCs) with developmental readout\",\n      \"pmids\": [\"29440509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ATF6 shapes early CHOP dynamics during UPR; ATF6 siRNA knockdown alters CHOP induction kinetics, confirmed by dynamic mathematical modeling calibrated against single-cell fluorescence microscopy of BAC-GFP reporter lines.\",\n      \"method\": \"siRNA knockdown, BAC-GFP reporter cell lines, live microscopy, dynamic mathematical modeling\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative live-cell imaging + mathematical modeling + siRNA; single lab\",\n      \"pmids\": [\"32058971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"EDEM1 silencing stabilizes ATF6 protein and increases ATF6 export to the Golgi during ER stress, revealing that ATF6 is natively unstable and EDEM1 normally limits ATF6 bioavailability; an EDEM1 somatic variant (N198I) found in hepatocellular carcinoma alters ATF6 signaling.\",\n      \"method\": \"siRNA phenotypic screen, ATF6 protein stability assays, immunofluorescence of Golgi export\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — siRNA screen + biochemical stability and localization assays; single lab\",\n      \"pmids\": [\"30281916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATF6 is required for efficient clearance of misfolded P23H rhodopsin in rod photoreceptors; Atf6-/- mice carrying P23H rhodopsin accumulate elevated rhodopsin protein (not mRNA) at early ages and develop accelerated retinal degeneration, with compensatory IRE1 hyperactivation.\",\n      \"method\": \"Atf6 knockout crossed with P23H rhodopsin knock-in mice, immunoblot, qPCR, ERG, IRE1 pathway analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic double-mutant mouse model with protein homeostasis and functional retinal readouts\",\n      \"pmids\": [\"34381136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 directly induces transcription of the tPA gene (Plat) in hepatocytes; hepatocyte-specific ATF6 knockout mice show decreased liver tPA, circulating tPA, and fibrinolytic activity; DACH1 corepressor represses ATF6 to downregulate tPA, establishing an ATF6-tPA axis controlling systemic fibrinolysis.\",\n      \"method\": \"Hepatocyte-specific ATF6 and DACH1 knockout mice, ChIP, reporter assays, bleeding time/thrombosis assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mouse + ChIP + functional coagulation assays\",\n      \"pmids\": [\"30504459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATF6 interacts with the FGF2 promoter and promotes FGF2 transcription in chondrocytes; ATF6 inhibitor Ceapin-A7 blocks ATF6-FGF2-driven angiogenesis in vitro and angiogenesis-osteogenesis coupling in vivo in an ankylosing spondylitis model.\",\n      \"method\": \"ChIP (ATF6 on FGF2 promoter), reporter assays, ATF6 inhibitor Ceapin-A7, in vivo SKG mouse model\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + in vivo pharmacological inhibition; single lab\",\n      \"pmids\": [\"34296071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Selective pharmacological activation of ATF6 preferentially reduces misfolded mutant rhodopsin (multiple RP-causing variants) with minimal effects on wild-type rhodopsin, demonstrating ATF6 activates a quality-control degradation program for misfolded ER clients.\",\n      \"method\": \"Inducible ATF6f expression system, wild-type vs. mutant rhodopsin co-expression, immunoblot\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — inducible gain-of-function with multiple rhodopsin variants; single lab\",\n      \"pmids\": [\"22956602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ATF6 promotes AIFM2 transcription by directly binding to both the p53 and AIFM2 gene promoters; ATF6 knockout in SAP mice attenuates acinar apoptosis and ER disorder, while AIFM2 overexpression can re-establish pathological features in ATF6-null SAP mice.\",\n      \"method\": \"ATF6 knockout mice (crossed with PRSS1 transgenic SAP model), ChIP-qPCR, luciferase reporter, adenovirus-mediated overexpression/knockdown, proteomics\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP + KO mouse rescue experiment + reporter assays with multiple orthogonal methods\",\n      \"pmids\": [\"32724472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ATF6 translocates from cytoplasm to nucleus during odontoblast differentiation; ATF6 overexpression increases DSPP and DMP1 expression, alkaline phosphatase activity, and matrix mineralization; ATF6 inhibition decreases ALP activity, establishing ATF6 as a regulator of odontoblastic differentiation.\",\n      \"method\": \"Immunofluorescence/confocal microscopy (ATF6 translocation), adenoviral overexpression, siRNA inhibition, alizarin red staining, ALP assay\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain and loss of function with specific differentiation readouts; single lab\",\n      \"pmids\": [\"24570149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Pharmacological ATF6 activation increases assembly, trafficking, and surface expression of variant GABAA receptors by remodeling ER proteostasis, specifically upregulating BiP and the trafficking receptor LMAN1 and enhancing their interactions with GABAA receptor subunits.\",\n      \"method\": \"Small-molecule ATF6 activators, co-immunoprecipitation (BiP/LMAN1 with GABAA subunits), surface biotinylation, electrophysiology\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological + Co-IP + functional electrophysiology; single lab\",\n      \"pmids\": [\"35477478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ATF6 binds the promoter of p50Atf6-responsive element in the osteocalcin (Bglap) gene; ChIP assay shows increased p50Atf6 binding to Bglap promoter upon MTA treatment; Atf6 shRNA knockdown abolishes MTA-induced mineralization, establishing an ATF6–osteocalcin axis in osteoblastogenesis.\",\n      \"method\": \"ChIP, luciferase reporter, Tet-on shRNA Atf6 knockdown, mineralization assay\",\n      \"journal\": \"Bone reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + loss-of-function with functional readout; single lab\",\n      \"pmids\": [\"28377952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ATF6 pharmacological activation by small-molecule activators corrects folding and increases neutrophil elastase inhibitory activity of most alpha-1-antitrypsin deficiency variants (including Z-AAT), reducing polymer accumulation; machine learning identified the 'gate' area as an unexpected ATF6-responsive region.\",\n      \"method\": \"Pharmacological ATF6 activators (AA147), NE inhibition assay, polymer ELISA, Gaussian process machine learning across 71 AATD variants\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological activation with functional biochemical readouts across many variants; single lab\",\n      \"pmids\": [\"36630963\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATF6 is an ER-resident type II transmembrane bZIP transcription factor that is normally retained in the ER through BiP binding and disulfide-bonded dimerization; upon ER stress (or sphingolipid signals via its transmembrane domain), disulfide bonds are reduced, BiP dissociates, and ATF6 traffics to the Golgi where it is sequentially cleaved by SKI-1/S1P and S2P to release a ~50 kDa N-terminal fragment (p50ATF6) that translocates to the nucleus, binds ERSE/ERSE-II elements (requiring NF-Y as a co-factor) to drive transcription of ER chaperones (BiP/GRP78), ERAD components, and XBP1 mRNA (which is then spliced by IRE1 to a potent activator), and also contains a VP16-like VN8 domain that simultaneously mediates potent transcriptional activation and rapid proteasomal self-degradation; ATF6 activity is post-translationally regulated by ubiquitination (RNF186 promotes, OTUB1 stabilizes) and by SIRT1-mediated deacetylation, and its downstream transcriptional programs extend beyond ER proteostasis to include oxidative stress defense genes (catalase), fibrinolysis (tPA/Plat), and developmental gene programs (myocardin, osteocalcin, FGF2) relevant to cardiac, bone, retinal, and vascular biology.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ATF6 is an ER-resident type II transmembrane bZIP transcription factor that serves as a central sensor and effector of the unfolded protein response (UPR), integrating ER proteostasis with diverse developmental and stress-adaptive transcriptional programs. Under basal conditions, ATF6 is retained in the ER through BiP binding to its luminal domain and inter-chain disulfide bonds (C467 and C618); upon ER stress, disulfide reduction and BiP dissociation permit trafficking to the Golgi, where sequential cleavage by S1P/SKI-1 and S2P releases the ~50 kDa N-terminal fragment (p50ATF6) that translocates to the nucleus and activates ERSE- and ERSE-II-containing promoters in cooperation with NF-Y, driving expression of ER chaperones (BiP/GRP78), XBP1 mRNA, ERAD components, and oxidative stress defense genes such as catalase [PMID:10866666, PMID:11850408, PMID:14970232, PMID:31852864, PMID:27932512]. ATF6 is additionally activated through its transmembrane domain by sphingolipids (dihydrosphingosine/dihydroceramide), independently of the luminal proteotoxic stress-sensing mechanism, and its activity is post-translationally tuned by RNF186-mediated K152 ubiquitination, OTUB1-mediated deubiquitination, and SIRT1-mediated deacetylation [PMID:30086303, PMID:34623328, PMID:33686769, PMID:30537742]. Loss-of-function mutations in ATF6 cause achromatopsia with foveal hypoplasia, and ATF6 transcriptional targets extend beyond ER proteostasis to include tPA (systemic fibrinolysis), DAPK1 (IFN-γ-induced autophagy and antimicrobial defense), myocardin (smooth muscle differentiation), and osteocalcin, reflecting essential roles in retinal, cardiac, hepatic, immune, and skeletal biology [PMID:26029869, PMID:30504459, PMID:22874566, PMID:26105053, PMID:28377952].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"ATF6 was first identified as a bZIP transcription factor that physically associates with SRF and contributes to serum-induced gene expression, establishing it as a nuclear transcriptional co-activator before its ER-stress role was known.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, reporter assays with ATF6-VP16 chimera and antisense ATF6\",\n      \"pmids\": [\"9271374\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SRF interaction was not followed up in the context of later UPR studies\", \"physiological relevance of ATF6-SRF axis unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"The discovery that ATF6 undergoes stress-induced proteolytic cleavage to generate a soluble nuclear form that activates ERSE-dependent transcription in partnership with NF-Y redefined ATF6 as a transmembrane ER-stress sensor rather than a conventional transcription factor.\",\n      \"evidence\": \"Biochemical fractionation, immunofluorescence, reporter assays, ERSE mutagenesis, co-IP with YY1\",\n      \"pmids\": [\"10866666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the protease(s) performing cleavage was not yet established\", \"mechanism of ER retention was unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of S1P and S2P as the sequential Golgi proteases generating p50ATF6, together with evidence that BiP dissociation from the ATF6 luminal domain permits ER-to-Golgi trafficking, established the complete regulated intramembrane proteolysis (RIP) activation mechanism and the BiP-based stress-sensing model.\",\n      \"evidence\": \"S2P-deficient CHO cells, nuclear fractionation, reporter assays, BiP co-IP and transport studies\",\n      \"pmids\": [\"11850408\", \"12110159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional ER-retention mechanisms exist beyond BiP binding\", \"redox regulation of ATF6 not yet addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Characterization of the VN8 domain in the ATF6 N-terminus revealed a dual-function motif coupling transcriptional activation to rapid proteasomal degradation, explaining the transient nature of ATF6 signaling and linking it to ATF6 and XBP1 mRNA induction as convergent UPR outputs.\",\n      \"evidence\": \"Deletion/point mutagenesis, proteasome inhibitor treatment, pulse-chase; XBP1 splicing assays in IRE1α-null MEFs and S2P-deficient CHO cells\",\n      \"pmids\": [\"11909875\", \"11779464\", \"11850408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase mediating VN8-dependent degradation was not identified\", \"structural basis of VN8 activity unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Dissection of three distinct cis-elements (ERSE, ERSE-II, UPRE) clarified the division of labor between ATF6 and XBP1: ATF6 is sufficient for BiP/ERSE induction via NF-Y, while ERSE-II targets require both ATF6 and XBP1, and UPRE elements are XBP1-exclusive.\",\n      \"evidence\": \"XBP1-null MEFs, reporter assays, EMSA, NF-Y interaction analysis\",\n      \"pmids\": [\"15598891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide mapping of ATF6-specific vs. shared targets not performed\", \"chromatin context effects not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"VAPB was identified as a physical interactor that attenuates ATF6 transcriptional output, with the ALS-linked P56S mutant acting as a more potent inhibitor, providing a link between ATF6 regulation and neurodegenerative disease.\",\n      \"evidence\": \"Co-immunoprecipitation, reporter assays with wild-type and P56S VAPB overexpression\",\n      \"pmids\": [\"18263603\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which VAPB suppresses ATF6 (retention, degradation?) is unresolved\", \"no reciprocal validation or endogenous-level evidence\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstration that simulated ischemia activates ATF6 to induce GRP78 in cardiac myocytes, with dominant-negative ATF6 increasing ischemia/reperfusion cell death, established ATF6 as a cardioprotective effector beyond canonical ER-stress paradigms.\",\n      \"evidence\": \"Nuclear fractionation, EMSA/ChIP on GRP78 promoter, ATF6 dominant-negative and miRNA knockdown in primary cardiac myocytes\",\n      \"pmids\": [\"19622751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full complement of cardiac ATF6 target genes not identified\", \"in vivo cardiac phenotype of ATF6 loss not yet tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Domain-swap experiments showed the ATF6 luminal tail is both necessary and sufficient for BiP-dependent ER retention and stress-regulated Golgi trafficking, distinguishing ATF6 from related ER-tethered transcription factors like CREB-H.\",\n      \"evidence\": \"Chimeric ATF6/CREB-H constructs, fluorescence microscopy, BiP co-IP, S1P cleavage assays\",\n      \"pmids\": [\"19883396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether glycosylation or other post-translational modifications of the luminal tail contribute to retention\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The PERK/eIF2α/ATF4 pathway was shown to be required for both ATF6 protein synthesis and ATF6 trafficking to the Golgi, revealing cross-talk between two UPR branches at the level of ATF6 activation.\",\n      \"evidence\": \"Liver-specific PERK knockout mice, pulse-chase, subcellular fractionation\",\n      \"pmids\": [\"21917591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PERK regulates ATF6 trafficking directly or via ATF4-induced gene products\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"ATF6 was found to directly bind the DAPK1 promoter downstream of IFN-γ signaling, driving autophagy induction; Atf6-knockout mice showed impaired autophagy and lethal susceptibility to bacterial infection, establishing ATF6 in innate immune defense.\",\n      \"evidence\": \"ChIP, promoter reporters, Atf6 KO mice with bacterial infection model, autophagy assays\",\n      \"pmids\": [\"22874566\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ATF6 cleaves in response to IFN-γ via canonical BiP-dependent mechanism or a distinct pathway\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Multiple independent studies established ATF6 as a transcriptional regulator of developmental and differentiation programs — driving myocardin in smooth muscle differentiation, osteocalcin in osteoblastogenesis, and Runx2-dependent chondrocyte hypertrophy — extending ATF6 function well beyond ER-stress proteostasis.\",\n      \"evidence\": \"ChIP on myocardin/osteocalcin/ATF6 promoters, reporter assays, Runx2 co-IP, ES cell and chondrocyte differentiation models, siRNA and overexpression\",\n      \"pmids\": [\"26105053\", \"28377952\", \"26374329\", \"26527399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether developmental ATF6 activation uses the same S1P/S2P cleavage mechanism\", \"no single integrated model connecting ATF6 to differentiation signal transduction\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Loss-of-function ATF6 mutations were identified as causative for achromatopsia with foveal hypoplasia, validated by attenuated UPR transcription in mutant assays and progressive photoreceptor dysfunction in Atf6-knockout mice, establishing ATF6 as essential for human cone photoreceptor development.\",\n      \"evidence\": \"Whole-exome sequencing of ACHM families, functional reporter assays, Atf6 KO mouse ERG and retinal morphology; subsequent classification of mutations into three mechanistic classes\",\n      \"pmids\": [\"26029869\", \"28028229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise developmental window requiring ATF6 in cone specification not defined\", \"whether sphingolipid-mediated ATF6 activation is relevant to retinal phenotype\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"ATF6 was shown to transcriptionally induce catalase and other oxidative stress defense genes by binding ERSE elements in their promoters; ATF6 KO mice had increased cardiac ischemia/reperfusion damage rescued by catalase overexpression, demonstrating ATF6 controls an antioxidant program beyond classical chaperone induction.\",\n      \"evidence\": \"ATF6 KO mice, I/R model, ChIP, gene array, AAV9-mediated ATF6 overexpression rescue\",\n      \"pmids\": [\"27932512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the antioxidant program is ATF6-specific or shared with ATF6β\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that sphingolipids (DHS/DHC) activate ATF6 through a transmembrane domain motif mechanistically distinct from the luminal proteotoxic stress-sensing pathway revealed a second, lipid-based activation mode and provided a druggable therapeutic strategy for ATF6-deficient achromatopsia.\",\n      \"evidence\": \"Site-directed TM domain mutagenesis, lipid addition, pathway-selective reporters, fenretinide treatment of ACHM mutant ATF6\",\n      \"pmids\": [\"30086303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of sphingolipid-TM domain interaction unknown\", \"whether lipid sensing operates through altered ATF6 oligomerization\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"ATF6 was identified as an 'off-switch' for IRE1: ATF6 loss leads to uncontrolled IRE1 upregulation and XBP1 hyper-splicing, revealing ATF6-dependent negative feedback within the UPR that limits IRE1 signaling duration.\",\n      \"evidence\": \"shRNA knockdown, live-cell fluorescent UPR reporters, ATF6 N-terminal domain rescue\",\n      \"pmids\": [\"30287689\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target gene(s) through which ATF6 suppresses IRE1 not identified\", \"single-lab finding awaiting independent confirmation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Hepatocyte-specific ATF6 knockout demonstrated that ATF6 directly drives tPA (Plat) transcription, controlling systemic fibrinolytic capacity, while pharmacological ATF6 activation in iPSCs suppresses pluripotency and directs mesodermal differentiation, confirming non-proteostatic developmental roles.\",\n      \"evidence\": \"Hepatocyte-specific ATF6 KO mice, ChIP, bleeding/thrombosis assays; ATF6 agonist AA147 treatment of iPSCs and ACHM patient iPSCs, transcriptomics\",\n      \"pmids\": [\"30504459\", \"29440509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether hepatic tPA regulation requires BiP-dependent ATF6 activation or basal ATF6 activity\", \"iPSC differentiation effects not validated in vivo\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolution of ATF6 disulfide-bonded oligomeric states (C467-dimer and C618-dimer) and demonstration that single disulfide reduction suffices for activation, with C618-dimers being more readily reduced, provided a molecular explanation for the rapidity and sensitivity of ATF6 stress sensing.\",\n      \"evidence\": \"ATF6α/ATF6β-deficient HCT116 cells, non-reducing SDS-PAGE, systematic cysteine mutagenesis\",\n      \"pmids\": [\"31852864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the reductase(s) acting on ATF6 disulfides in vivo\", \"whether redox and BiP-dissociation sensing are coupled or independent\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of RNF186-mediated ubiquitination at K152 as an activating signal for ATF6 downstream of NOD2 in macrophages, and OTUB1 as a stabilizing deubiquitinase, established ubiquitin-dependent post-translational regulation of ATF6; RNF186 IBD risk variants impair this axis, linking ATF6 to inflammatory bowel disease susceptibility.\",\n      \"evidence\": \"Ubiquitination assays with K152 mutagenesis, RNF186 and ATF6 KO mice, Salmonella challenge; OTUB1 CRISPR ablation, xenograft model\",\n      \"pmids\": [\"34623328\", \"33686769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNF186-mediated ubiquitination promotes ATF6 trafficking or cleavage specifically\", \"whether OTUB1 acts directly on ATF6 or through an intermediary E3 ligase\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"ATF6 was shown to be required for efficient clearance of misfolded P23H rhodopsin, with Atf6 loss leading to protein accumulation and accelerated retinal degeneration, directly connecting ATF6's ERAD-enhancing transcriptional program to in vivo photoreceptor proteostasis.\",\n      \"evidence\": \"Atf6 KO × P23H rhodopsin knock-in mice, immunoblot, qPCR, ERG, IRE1 pathway analysis\",\n      \"pmids\": [\"34381136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ERAD components upregulated by ATF6 in photoreceptors not identified\", \"whether pharmacological ATF6 activation can rescue P23H degeneration\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Pharmacological ATF6 activation was demonstrated to enhance ER proteostasis broadly — correcting folding of GABAA receptor variants and alpha-1-antitrypsin deficiency variants — validating ATF6 as a druggable target for conformational diseases beyond the retina.\",\n      \"evidence\": \"Small-molecule ATF6 activators (AA147), surface biotinylation, electrophysiology (GABAA); NE inhibition assays, polymer ELISA across 71 AATD variants with machine learning\",\n      \"pmids\": [\"35477478\", \"36630963\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Long-term effects of sustained pharmacological ATF6 activation on ER homeostasis unknown\", \"whether ATF6 activation exerts proteotoxic stress in non-disease cells at therapeutic doses\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of the dual (luminal proteotoxic vs. transmembrane lipid) activation modes, the identity of the reductase(s) acting on ATF6 disulfide bonds, the full genome-wide target spectrum distinguishing ATF6α from ATF6β, and whether pharmacological ATF6 modulation can treat achromatopsia, IBD, or conformational diseases in human patients.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of full-length ATF6\", \"ATF6α vs. ATF6β target gene specificity not systematically resolved\", \"clinical translation of ATF6 agonists not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 7, 10, 15, 24, 25, 33, 34, 36, 39]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 5, 6, 7, 10, 13, 14, 15, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 4, 11, 16, 18]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 8, 11, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 5, 6, 10, 37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7, 12, 15, 17, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 5, 7, 13, 14, 15, 33]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 5, 21, 22, 31]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21, 24]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [14, 25, 26, 27, 29]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"HSPA5\",\n      \"MBTPS1\",\n      \"MBTPS2\",\n      \"NFYA\",\n      \"RNF186\",\n      \"OTUB1\",\n      \"RUNX2\",\n      \"VAPB\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}