{"gene":"ATF6","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1997,"finding":"ATF6 (a basic-leucine zipper protein) was identified as a direct binding partner of serum response factor (SRF), specifically interacting with SRF's transcriptional activation domain. This interaction was detected by yeast two-hybrid screen and confirmed in vitro. An ATF6-VP16 chimera activated SRE reporter expression, and antisense ATF6 reduced serum induction of c-fos, indicating ATF6 participates in SRF-dependent transcription.","method":"Yeast two-hybrid screen, in vitro binding assay, reporter gene assay, antisense inhibition","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus in vitro binding plus functional reporter assay, single lab","pmids":["9271374"],"is_preprint":false},{"year":2000,"finding":"ATF6 binds a consensus DNA sequence related to but distinct from ATF1/CREB sites; this ATF6-binding site is specifically activated by ATF6 overexpression and strongly induced by ER stress. A dominant-negative ATF6 blocked ER stress induction of both ATF6-site and GRP78 reporter genes. GAL4-ATF6 was activated by ER stress, demonstrating ATF6 is a direct transcriptional effector of the ER stress response. Human IRE1 (hIRE1) was found sufficient to activate the ATF6 reporter, and dominant-negative hIRE1 blocked it, placing hIRE1 upstream of ATF6.","method":"Reporter gene assay, dominant-negative constructs, GAL4 fusion assay, transient transfection","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (reporter assay, dominant-negative, epistasis), replicated across multiple constructs in same study","pmids":["10856300"],"is_preprint":false},{"year":2001,"finding":"ATF6 was shown to transcriptionally induce XBP1, and only the IRE1-spliced form of XBP1 mRNA produces a highly active transcription factor that efficiently activates the UPR. ATF6-dependent and IRE1-dependent pathways were thus linked, with ATF6 functioning upstream of XBP1 induction.","method":"Transcriptional reporter assays, Northern/Western blotting, identification of spliced XBP1 product","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, highly cited, defines pathway ordering between ATF6 and IRE1/XBP1 arms","pmids":["11779464"],"is_preprint":false},{"year":2002,"finding":"ATF6's N-terminal 93 amino acids contain a domain homologous to the VP16 viral protein (VN8 region) that is simultaneously required for transcriptional activation and rapid proteasomal degradation. Point mutations in this VN8-like domain caused loss of transcriptional activity, increased ATF6 expression levels, and increased half-life, demonstrating that potent transcriptional activity and rapid proteasome-mediated turnover of ATF6 are co-regulated by this domain.","method":"Deletion and point mutagenesis, reporter gene assay, proteasome inhibitor treatment, protein half-life measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with functional transcription and stability assays in single rigorous study","pmids":["11909875"],"is_preprint":false},{"year":2002,"finding":"The ER chaperone BiP/GRP78 binds ATF6 and retains it in the ER; dissociation of BiP from ATF6 upon ER stress initiates ATF6 transport to the Golgi for proteolytic activation. BiP thus acts as a key sensor of ER folding capacity controlling ATF6 activation.","method":"Review/commentary citing experimental evidence from same issue (co-immunoprecipitation and trafficking assays described in referenced primary paper)","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — commentary citing primary experimental work; BiP-ATF6 interaction well established but this PMID is secondary commentary","pmids":["12110159"],"is_preprint":false},{"year":2004,"finding":"ATF6's N-terminal fragment (ATF6(N)) directly binds SREBP2(N) via its leucine-zipper domain, as shown by GST pull-down and co-immunoprecipitation. ATF6(N) forms a complex with SREBP2(N) on sterol response elements (ChIP assay) and recruits HDAC1 to this complex, thereby attenuating SREBP2-mediated lipogenic transcription. Glucose deprivation activates ATF6 and suppresses SREBP2 target genes, and blocking ATF6 cleavage (by BiP overexpression) reverses this inhibitory effect.","method":"GST pull-down, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter gene assay, deletion analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal biochemical methods (pull-down, co-IP, ChIP, reporter) in single study demonstrating direct interaction and mechanism","pmids":["14765107"],"is_preprint":false},{"year":2007,"finding":"ER stressors transcriptionally upregulate ATF6 mRNA expression. This upregulation is mediated by proteolytically cleaved p50-ATF6 binding to putative ATF6-binding elements in the ATF6 promoter, creating a positive autoregulatory feedback loop. Inhibition of S1P (the protease that cleaves ATF6) suppressed ATF6 mRNA upregulation.","method":"RT-PCR, promoter reporter assay, S1P inhibitor treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter plus S1P inhibitor plus RT-PCR, single lab","pmids":["17307147"],"is_preprint":false},{"year":2008,"finding":"VAPA and VAPB MSP domains interact directly with ER-localized ATF6. Overexpression of VAPB or the ALS-associated mutant VAPB(P56S) attenuates ATF6-regulated transcriptional activity, with the P56S mutant being a more potent inhibitor of ATF6 activity.","method":"Co-immunoprecipitation, transcriptional reporter assay, overexpression studies","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus functional reporter assay, single lab","pmids":["18263603"],"is_preprint":false},{"year":2009,"finding":"Simulated ischemia (sI) in cardiac myocytes causes ATF6 to translocate from the ER to nuclear fractions. An ERSE in the GRP78 promoter not previously required for other ER stresses was found to bind ATF6 and was critical for maximal ischemia-mediated GRP78 induction. Dominant-negative ATF6 or ATF6-targeted miRNA blocked sI-mediated GRP78 induction and increased cardiac myocyte death upon reperfusion, establishing ATF6 as the key mediator of the ischemic ER stress response.","method":"Subcellular fractionation, ChIP/EMSA, dominant-negative ATF6, miRNA knockdown, cell death assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (fractionation, EMSA, dominant-negative, miRNA KD, cell viability) in single study","pmids":["19622751"],"is_preprint":false},{"year":2011,"finding":"BMP2 induces ATF6 expression and activation in osteoblasts through Runx2 directly binding to an OSE2 motif (-205 to -200 bp) in the Atf6 promoter. ATF6 in turn directly binds an ATF6-binding motif in the osteocalcin (Oc) promoter to induce Oc expression. Dominant-negative ATF6 blocked BMP2/Runx2-induced osteocalcin expression, and BMP2-induced ATF6 activation was absent in Runx2-/- osteoblasts.","method":"ChIP assay, promoter reporter assay, dominant-negative ATF6, Runx2-/- cells, overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP plus reporter assay plus KO rescue, multiple orthogonal methods in single study","pmids":["22102412"],"is_preprint":false},{"year":2011,"finding":"The PERK/eIF2α~P/ATF4 pathway is required not only for translational control but also for activation of ATF6 and its target genes during ER stress. PERK facilitates both the synthesis of ATF6 and trafficking of ATF6 from the ER to the Golgi for intramembrane proteolysis. Liver-specific PERK depletion significantly reduces ATF6 activation.","method":"Genetic knockdown/knockout of PERK, immunoblot, subcellular fractionation, liver-specific conditional knockout","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional knockout combined with fractionation and biochemical assays, multiple cell and in vivo models","pmids":["21917591"],"is_preprint":false},{"year":2012,"finding":"ATF6 possesses two mechanistically distinct activation pathways: (1) a luminal domain-dependent pathway activated by proteotoxic/ER stress, and (2) a transmembrane domain-dependent pathway activated by specific sphingolipids dihydrosphingosine (DHS) and dihydroceramide (DHC). Single point mutations in a newly identified transmembrane domain motif selectively abolish DHS/DHC-mediated activation while leaving proteotoxic stress activation intact.","method":"Site-directed mutagenesis, lipid addition assays, UPR reporter assays, pharmacological induction","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structure-function mutagenesis identifying distinct activation domains, orthogonal reporter assays, single rigorous study","pmids":["30086303"],"is_preprint":false},{"year":2013,"finding":"ATF6 directly binds the XBP1 promoter to enhance XBP1 expression; both ATF6 and IRE1α synergistically regulate endogenous XBP1S gene expression in osteoarthritis cartilage. siRNA knockdown experiments confirmed ATF6's role upstream of XBP1S.","method":"ChIP assay, siRNA knockdown, promoter analysis, Western blotting","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP and siRNA in single lab, limited orthogonal validation","pmids":["24269637"],"is_preprint":false},{"year":2014,"finding":"The ASK1-MKK3/MKK6-p38 MAPK pathway controls ATF6 activity downstream of IFN-γ signaling. p38 MAPK phosphorylates a critical threonine residue in ATF6 upstream of its DNA binding domain. ATF6 mutants defective for p38 MAPK phosphorylation fail to undergo proteolytic processing in the Golgi and cannot drive IFN-γ-induced gene expression or autophagy.","method":"Kinase assay (p38 MAPK phosphorylation), site-directed mutagenesis, pharmacological inhibition of ASK1/MKK/p38, reporter assay, ASK1-/- mice","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of phosphorylation site, kinase pathway inhibition, and in vivo mouse model in single study","pmids":["25135476"],"is_preprint":false},{"year":2016,"finding":"ATF6 induces a program of oxidative stress response genes (including catalase) in addition to canonical ER chaperone genes. ER stress response elements (ERSEs) were identified in the catalase gene promoter and shown to bind ATF6 in cardiac myocytes, increasing catalase promoter activity. ATF6 knockout hearts showed increased ROS and damage after ischemia/reperfusion that was rescued by catalase overexpression, establishing catalase as a functional ATF6 target linking ER and oxidative stress responses.","method":"Gene array, EMSA/ChIP (ERSE-ATF6 binding), ATF6 KO mice, AAV9-mediated ATF6 overexpression, catalase overexpression rescue, I/R model","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ChIP, KO mice, rescue experiments) replicated in cells and in vivo","pmids":["27932512"],"is_preprint":false},{"year":2016,"finding":"Achromatopsia-associated ATF6 mutations fall into three mechanistic classes: Class 1 — impaired ER-to-Golgi trafficking and diminished regulated intramembrane proteolysis and transcriptional activity; Class 2 — intact cytosolic domain with constitutive transcriptional activity even without ER stress; Class 3 — complete loss of transcriptional activity due to absent or defective bZIP domains. Patient fibroblasts with Class 1 or Class 3 mutations show increased cell death in response to ER stress.","method":"Functional ATF6 mutation analysis, subcellular trafficking assays, proteolytic processing assays, transcriptional reporter assays, patient fibroblast cell death assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — comprehensive functional characterization of disease mutations using multiple orthogonal methods across many mutants","pmids":["28028229"],"is_preprint":false},{"year":2018,"finding":"The small molecule 147 (N-(2-hydroxy-5-methylphenyl)-3-phenylpropanamide) preferentially activates ATF6 through metabolic oxidation to an electrophile that covalently modifies ER-resident proteins including protein disulfide isomerases (PDIs). Genetic depletion of PDIs perturbs 147-dependent induction of the ATF6 target gene BiP, implicating PDI modification in ATF6-selective activation. Thus 147 functions as a pro-drug that activates ATF6 via localized ER-targeted covalent modification.","method":"Chemical proteomics (identification of covalently modified proteins), genetic PDI depletion, target gene induction assay, metabolic activation studies","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — chemical proteomics plus genetic depletion plus functional assays, multiple orthogonal methods in single rigorous study","pmids":["30084354"],"is_preprint":false},{"year":2018,"finding":"Loss of ATF6 expression results in uncontrolled IRE1 signaling and increased XBP1 splicing. The transcriptionally active N-terminal domain of ATF6 reversed increases in IRE1 mRNA and protein levels induced by ER stress, establishing ATF6 as a negative regulator ('off-switch') of IRE1 signaling. IRE1 transcription is regulated through a positive feed-forward loop involving IRE1 kinase activity and downstream JNK.","method":"shRNA-mediated ATF6 silencing, live-cell fluorescent UPR reporter assay, IRE1 overexpression with ATF6-N-terminal domain rescue, JNK/IRE1 kinase inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ATF6 KD plus rescue with active domain plus reporter assays, multiple orthogonal methods","pmids":["30287689"],"is_preprint":false},{"year":2018,"finding":"ATF6 is required for EDEM1-regulated ER export; silencing EDEM1 increases ATF6 bioavailability by stabilizing the natively unstable ATF6 protein, enhancing its export to the Golgi for S1P/S2P cleavage. A somatic EDEM1 variant (N198I) found in hepatocellular carcinoma alters ATF6 signaling.","method":"siRNA phenotypic screen, ATF6 stability assays, EDEM1 silencing and variant analysis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA screen plus stability assays, single lab, limited mechanistic depth reported in abstract","pmids":["30281916"],"is_preprint":false},{"year":2018,"finding":"ATF6 is induced by STAT6 in TH2 cells and STAT3 in TH17 cells, and ATF6 promotes TH2 and TH17 differentiation and cytokine secretion. T cell-specific Atf6 deficiency impaired TH2 and TH17 responses in vitro and in vivo and attenuated mixed granulocytic experimental asthma.","method":"Conditional T cell-specific Atf6 knockout mice, in vitro differentiation assays, cytokine measurement, in vivo asthma model","journal":"Mucosal immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with in vitro and in vivo phenotypes, single lab","pmids":["37209959"],"is_preprint":false},{"year":2018,"finding":"ATF6 promotes mesodermal cell fate during differentiation of human stem cells. Pharmacological ATF6 activation suppressed pluripotency and directed mesodermal differentiation; conversely, iPSCs from patients with ATF6 loss-of-function mutations showed impaired mesodermal differentiation.","method":"Small-molecule ATF6 agonist activation, patient iPSC lines with ATF6 mutations, transcriptome analysis of germ layer markers","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological activation plus patient iPSC loss-of-function, single lab, two orthogonal approaches","pmids":["29440509"],"is_preprint":false},{"year":2018,"finding":"ATF6 induces the tPA gene (Plat) in hepatocytes; the co-repressor DACH1 represses ATF6, thereby reducing hepatocyte Plat expression and circulating tPA. Hepatocyte-ATF6 knockout mice show decreased plasma tPA, fibrinolytic activity, and altered thrombosis parameters, establishing a DACH1-ATF6-tPA axis controlling systemic fibrinolysis.","method":"Hepatocyte-specific ATF6 knockout mice, DACH1 knockout mice, hepatocyte Plat silencing, measurement of plasma tPA and fibrinolytic activity","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO mice plus in vivo functional readouts, multiple genetic models converging on same pathway","pmids":["30504459"],"is_preprint":false},{"year":2019,"finding":"ATF6 transcriptionally induces RHEB (Ras homologue enriched in brain), an activator of mTORC1, during cardiac hypertrophy. Cardiac myocyte-specific ATF6 deletion blunted hypertrophy and mTORC1 activation in response to pressure overload and exercise; ectopic RHEB expression restored hypertrophy in ATF6 cKO hearts. ChIP identified RHEB as a direct ATF6 target gene in the heart.","method":"Cardiac myocyte-specific Atf6 conditional knockout, transcript profiling, ChIP, AAV9-RHEB rescue, transverse aortic constriction and exercise models","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO, ChIP, in vivo rescue experiments, multiple complementary models","pmids":["30582446"],"is_preprint":false},{"year":2020,"finding":"ATF6 shapes the early dynamics of pro-apoptotic CHOP during the UPR. Mathematical modeling and siRNA knockdown of individual UPR branches showed that ATF6 is required for full CHOP induction dynamics, with ATF6 acting as an important regulator of CHOP and therefore cell fate decisions.","method":"BAC-GFP reporter cell lines, live-cell microscopy, dynamic mathematical modeling, single siRNA knockdowns","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live reporter imaging plus mathematical modeling plus siRNA perturbations, single lab","pmids":["32058971"],"is_preprint":false},{"year":2020,"finding":"In C. elegans, inhibition of the ATF6 ortholog (atf-6) increases lifespan by modulating calcium homeostasis: atf-6 loss downregulates the ER calcium buffer calreticulin, and ER calcium release via IP3R (itr-1) is required for longevity. Mitochondrial calcium import channel mcu-1 is also required for the longevity conferred by atf-6 loss, revealing an ER-mitochondria calcium signaling axis downstream of atf-6.","method":"C. elegans genetic loss-of-function, epistasis analysis with itr-1 (IP3R) and mcu-1 mutants, lifespan assays, calcium flux measurements","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in C. elegans with lifespan and calcium readouts, ortholog study","pmids":["32905769"],"is_preprint":false},{"year":2020,"finding":"ATF6 decreases the activation of cardiac fibroblasts in response to TGFβ by suppressing fibroblast contraction and α-smooth muscle actin (αSMA) induction through inhibition of the TGFβ-Smad signaling axis. ATF6 silencing or deletion hyperactivated fibroblasts.","method":"ATF6 activation (pharmacological), siRNA knockdown, ATF6 knockout fibroblasts, contraction assay, αSMA measurement","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological activation plus genetic deletion plus functional cellular assays, single lab","pmids":["32085622"],"is_preprint":false},{"year":2021,"finding":"RNF186, an E3 ubiquitin ligase, ubiquitinates ATF6 at lysine 152 upon NOD2 pattern recognition receptor stimulation in human macrophages. RNF186 localizes to the ER and forms a complex with ER stress sensors including ATF6; this ubiquitination promotes UPR activation, cytokine secretion, and antimicrobial pathway induction. IBD-associated RNF186 risk variants reduce NOD2-induced ATF6 ubiquitination and downstream outcomes.","method":"Co-immunoprecipitation, ubiquitination assay with K152 mutagenesis, RNF186-deficient cells, ATF6-deficient mice, in vivo infection models","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — site-specific ubiquitination mapping (K152), co-IP complex formation, KO mice with in vivo validation, disease variant functional analysis","pmids":["34623328"],"is_preprint":false},{"year":2021,"finding":"OTUB1 (deubiquitinase otubain 1) stabilizes ATF6 by inhibiting its ubiquitylation in response to ER stress, thereby activating ATF6 signaling and promoting bladder cancer progression. Genetic ablation of OTUB1 inhibited ATF6 target gene expression and cancer cell proliferation.","method":"Luciferase pathway screening, OTUB1 knockout (in vitro and in vivo), ubiquitylation assay","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — luciferase screening plus ubiquitylation assay plus KO phenotype, single lab","pmids":["33686769"],"is_preprint":false},{"year":2021,"finding":"ATF6 is essential for human cone photoreceptor development. Retinal organoids from ATF6-null hESCs or achromatopsia patient iPSCs failed to form cone structures and lost cone phototransduction gene expression, while rod photoreceptors developed normally. A selective small-molecule ATF6 agonist restored transcriptional activity of some ATF6 disease variants and stimulated cone growth in patient organoids.","method":"CRISPR/Cas9 ATF6 null hESCs, patient iPSC retinal organoids, gene expression analysis, adaptive optics retinal imaging of patients, small-molecule ATF6 agonist rescue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic null plus patient iPSC plus pharmacological rescue, corroborated by human patient imaging","pmids":["34561305"],"is_preprint":false},{"year":2021,"finding":"ATF6 is required for efficient clearance of P23H mutant rhodopsin in rod photoreceptors. Atf6-/- mice expressing P23H rhodopsin accumulate more rhodopsin protein at early ages (without changes in mRNA), and ultimately develop accelerated retinal degeneration compared to Atf6+/- controls.","method":"Atf6 knockout combined with P23H rhodopsin knock-in, rhodopsin protein and mRNA quantification, retinal layer thickness measurement","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic double mutant model with molecular and histological readouts, single lab","pmids":["34381136"],"is_preprint":false},{"year":2021,"finding":"ATF6 directly binds the promoter of p53 and AIFM2 to promote their transcription in severe acute pancreatitis (SAP). ATF6 knockout in SAP mice attenuated acinar injury and apoptosis; AIFM2 overexpression re-established pathological disorder in ATF6-KO SAP mice. p53 knockout significantly suppressed acinar apoptosis and injury.","method":"ATF6 knockout mice, ChIP-qPCR, luciferase reporter assay, adenovirus-mediated overexpression/knockdown, proteomics","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase plus KO with rescue experiments, single lab","pmids":["32724472"],"is_preprint":false},{"year":2025,"finding":"GRINA interacts directly with ATF6 and recruits HRD1 to form a multiprotein complex that catalyzes ATF6 polyubiquitination, promoting ATF6 degradation. This GRINA-HRD1-ATF6 complex suppresses ER autophagy (ER-phagy) and protects hepatocytes from ischemia-reperfusion injury. Inhibition of ATF6 degradation attenuated the protective effects of GRINA.","method":"Co-immunoprecipitation, mass spectrometry, ubiquitination assay, hepatocyte-specific Grina KO and transgenic mice, RNA sequencing","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — co-IP complex identification, ubiquitination assay, genetic KO and OE mice with functional rescue, multiple orthogonal methods","pmids":["39855351"],"is_preprint":false},{"year":2015,"finding":"ATF6a interacts directly with Runx2 protein and augments Runx2-mediated hypertrophic chondrocyte differentiation. Overexpression of ATF6/ATF6a enhanced chondrogenesis and mineralization; ATF6a knockdown suppressed chondrocyte differentiation. ATF6a also regulated IHH and PTHrP signaling during chondrocyte hypertrophy.","method":"Co-immunoprecipitation (ATF6a-Runx2 interaction), siRNA knockdown, adenoviral overexpression, in vitro differentiation assay, immunohistochemistry","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus functional differentiation assays, single lab","pmids":["26527399"],"is_preprint":false},{"year":2020,"finding":"BCAA/BCKA (branched chain amino acids and keto acids, specifically valine and leucine but not isoleucine) transcriptionally upregulate PPAR-α through the GCN2/ATF6 pathway. In a genetic mouse model with BCAA catabolic defects, adenovirus-mediated PPAR-α silencing reversed the increased fatty acid oxidation and cardiac I/R vulnerability caused by BCAA accumulation.","method":"Seahorse metabolic flux analysis, BCAA oral gavage mouse model, genetic BCAA catabolic defect model, adenovirus-mediated PPAR-α silencing","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo genetic models with metabolic rescue, single lab; ATF6 pathway placement inferred from genetic evidence","pmids":["32373236"],"is_preprint":false},{"year":2018,"finding":"ATF6 transcriptional programs (activated independently of stress using a small molecule) remodel the ER proteostasis network in ways that are distinct from XBP1s programs and differentially influence folding, trafficking, and degradation of destabilized ER client proteins. Quantitative proteomics defined the specific proteostasis factors upregulated by ATF6 versus XBP1s.","method":"Orthogonal small-molecule-mediated ATF6/XBP1s activation, transcriptomics, quantitative proteomics","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transcriptomics plus quantitative proteomics with specific ATF6 activation, single lab","pmids":["23583182"],"is_preprint":false}],"current_model":"ATF6 is an ER-transmembrane basic-leucine zipper transcription factor that, upon ER stress (or specific sphingolipid signals via its transmembrane domain), dissociates from the retaining chaperone BiP, traffics to the Golgi where it is cleaved by S1P and S2P proteases (regulated by p38 MAPK phosphorylation at a critical threonine and by ubiquitination at K152 via RNF186, with deubiquitination by OTUB1 and degradation promoted by GRINA-HRD1 complexes), releasing an N-terminal fragment that translocates to the nucleus to bind ERSE/ATF6-consensus sites and drive transcription of ER chaperones, XBP1, RHEB (activating mTORC1 for cardiac hypertrophy), tPA (fibrinolysis), catalase (oxidative stress defense), and other targets; ATF6 also directly binds SREBP2 via its leucine zipper to recruit HDAC1 and suppress lipogenesis, interacts with SRF to modulate immediate-early gene transcription, and acts as an off-switch for IRE1 signaling, while its activity is subject to autoregulatory transcriptional feedback and rapid proteasomal degradation mediated by a VN8-like N-terminal domain."},"narrative":{"mechanistic_narrative":"ATF6 is an ER-resident basic-leucine zipper transcription factor that serves as one of the three principal effector arms of the unfolded protein response, converting ER stress into a transcriptional program that restores proteostasis [PMID:10856300, PMID:11779464]. Under homeostatic conditions ATF6 is retained in the ER through binding by the chaperone BiP/GRP78, whose dissociation upon ER stress licenses ATF6 trafficking to the Golgi for regulated intramembrane proteolysis [PMID:12110159]. ATF6 carries two mechanistically separable activation inputs: a luminal-domain pathway responsive to proteotoxic stress and a transmembrane-domain pathway activated by the sphingolipids dihydrosphingosine and dihydroceramide [PMID:30086303]. Proteolytic release of the N-terminal fragment generates a nuclear transcription factor that binds ATF6-consensus/ERSE elements; this same N-terminal region contains a VP16-like (VN8) domain that couples potent transactivation to rapid proteasomal turnover [PMID:11909875]. The cleaved fragment drives chaperone and proteostasis genes and induces XBP1, integrating the ATF6 and IRE1 arms while also acting as a negative off-switch that restrains IRE1/XBP1s signaling [PMID:11779464, PMID:30287689, PMID:23583182]. Beyond canonical UPR targets, ATF6 directly induces tissue- and context-specific genes including catalase for oxidative-stress defense [PMID:27932512], RHEB to activate mTORC1 during cardiac hypertrophy [PMID:30582446], and tPA (Plat) for hepatic fibrinolysis [PMID:30504459], and it suppresses lipogenesis by binding SREBP2 through its leucine zipper to recruit HDAC1 [PMID:14765107]. ATF6 activity is tuned by post-translational control: p38 MAPK phosphorylation of a threonine upstream of the DNA-binding domain is required for Golgi processing [PMID:25135476], while ubiquitination at K152 by RNF186, deubiquitination/stabilization by OTUB1, and degradation via a GRINA-HRD1 complex set ATF6 abundance and signaling output [PMID:34623328, PMID:33686769, PMID:39855351]. Loss-of-function ATF6 mutations cause achromatopsia and impair cone photoreceptor development, with disease alleles falling into trafficking-defective, constitutively active, and transactivation-dead classes [PMID:28028229, PMID:34561305].","teleology":[{"year":1997,"claim":"Established ATF6 as a transcriptional cofactor before its UPR role was known, by showing it physically engages SRF to support serum-induced immediate-early gene expression.","evidence":"Yeast two-hybrid screen, in vitro binding, and SRE reporter/antisense assays","pmids":["9271374"],"confidence":"Medium","gaps":["Does not connect ATF6 to ER stress or membrane regulation","Single lab, no structural characterization of the SRF interface"]},{"year":2000,"claim":"Defined ATF6 as a direct transcriptional effector of ER stress with its own consensus DNA element, and placed it downstream of IRE1, answering what ATF6 actually does during the UPR.","evidence":"Reporter assays, dominant-negative and GAL4-fusion constructs, epistasis with hIRE1","pmids":["10856300"],"confidence":"High","gaps":["Did not establish the proteolytic activation mechanism","Endogenous target gene repertoire not yet mapped"]},{"year":2001,"claim":"Linked the ATF6 and IRE1 arms by showing ATF6 induces XBP1 transcription, with only IRE1-spliced XBP1 yielding an active factor, defining pathway ordering within the UPR.","evidence":"Reporter assays, Northern/Western blotting, identification of spliced XBP1","pmids":["11779464"],"confidence":"High","gaps":["Direct ATF6 binding to the XBP1 promoter not yet shown (addressed later)","Functional division of labor between the two arms unresolved"]},{"year":2002,"claim":"Explained how ATF6 is held inactive and how activation begins, identifying BiP retention in the ER and stress-induced dissociation as the trigger for Golgi trafficking, and identifying the VN8 domain that couples transactivation to rapid degradation.","evidence":"Co-IP/trafficking work (cited commentary) and VN8 deletion/point mutagenesis with half-life and proteasome assays","pmids":["12110159","11909875"],"confidence":"High","gaps":["The S1P/S2P proteolysis step itself not characterized in these entries","Identity of the ubiquitin machinery acting on ATF6 unknown at this time"]},{"year":2004,"claim":"Revealed a non-canonical repressive function: cleaved ATF6 directly binds SREBP2 via its leucine zipper and recruits HDAC1 to suppress lipogenic transcription, tying nutrient/ER status to lipid metabolism.","evidence":"GST pull-down, co-IP, ChIP, and reporter assays with BiP-overexpression reversal","pmids":["14765107"],"confidence":"High","gaps":["Physiological contexts where this repression dominates not defined","Structural basis of the bZIP-SREBP2 heterodimer unresolved"]},{"year":2007,"claim":"Showed ATF6 autoregulates its own promoter through cleaved p50-ATF6, establishing a positive feedback loop that amplifies the UPR response.","evidence":"RT-PCR, promoter reporter assay, S1P inhibitor treatment","pmids":["17307147"],"confidence":"Medium","gaps":["Direct ChIP occupancy of the ATF6 promoter not shown","How feedback is terminated unaddressed"]},{"year":2011,"claim":"Connected ATF6 to additional regulatory inputs and target programs: PERK/ATF4 facilitates ATF6 synthesis and ER-to-Golgi trafficking, and BMP2/Runx2 drives ATF6 to induce osteocalcin, expanding ATF6 beyond generic stress.","evidence":"PERK conditional knockout with fractionation; ChIP, promoter reporters, Runx2-/- osteoblasts with dominant-negative ATF6","pmids":["21917591","22102412"],"confidence":"High","gaps":["Mechanism by which PERK promotes ATF6 trafficking not molecularly defined","Whether Runx2 control of ATF6 generalizes beyond bone unknown"]},{"year":2012,"claim":"Discovered a second, lipid-sensing activation route, showing ATF6 transmembrane-domain mutations selectively abolish dihydrosphingosine/dihydroceramide activation while sparing proteotoxic activation.","evidence":"Transmembrane motif mutagenesis, lipid addition, and UPR reporter assays","pmids":["30086303"],"confidence":"High","gaps":["How sphingolipids are sensed by the transmembrane domain mechanistically unknown","In vivo relevance of lipid-driven ATF6 activation not established"]},{"year":2014,"claim":"Identified phosphorylation control of ATF6 processing, showing the ASK1-MKK3/6-p38 axis phosphorylates a threonine required for Golgi cleavage and IFN-γ-driven gene expression and autophagy.","evidence":"Kinase assay, phosphosite mutagenesis, pathway inhibitors, and ASK1-/- mice","pmids":["25135476"],"confidence":"High","gaps":["How phosphorylation enables proteolysis mechanistically unresolved","Cross-talk with BiP release not integrated"]},{"year":2016,"claim":"Broadened the ATF6 target program to oxidative-stress defense, identifying catalase as a direct ATF6 target whose induction protects the ischemic heart.","evidence":"Gene array, EMSA/ChIP, ATF6 KO mice, AAV9 overexpression, and catalase rescue in I/R","pmids":["27932512"],"confidence":"High","gaps":["Breadth of the ATF6 oxidative-stress regulon beyond catalase undefined","Tissue specificity of this program not delineated"]},{"year":2016,"claim":"Defined the disease mechanism of ATF6 loss by classifying achromatopsia mutations into trafficking-defective, constitutively active, and transactivation-dead classes with distinct cellular consequences.","evidence":"Functional analysis of patient mutations: trafficking, proteolysis, reporter, and fibroblast death assays","pmids":["28028229"],"confidence":"High","gaps":["Why retinal cones are selectively vulnerable not explained here","Whether constitutively active alleles are gain-of-function in vivo unclear"]},{"year":2018,"claim":"Established ATF6 abundance as a tunable control point and dissected ATF6-specific proteostasis output: EDEM1 limits ATF6 stability/export, ATF6 acts as a negative off-switch on IRE1, and ATF6 vs XBP1s programs remodel proteostasis differently; selective small molecules (e.g. compound 147) activate ATF6 via ER-localized covalent PDI modification.","evidence":"siRNA stability screens, shRNA silencing with N-terminal rescue, UPR reporters, quantitative proteomics, and chemical proteomics with PDI depletion","pmids":["30281916","30287689","23583182","30084354"],"confidence":"High","gaps":["How ATF6 represses IRE1 transcription mechanistically unresolved","Direct ATF6 targets distinguishing it from XBP1s not all mapped"]},{"year":2018,"claim":"Demonstrated cell-fate and developmental roles for ATF6 across mesoderm specification, TH2/TH17 differentiation, and hepatic fibrinolysis, showing it drives lineage- and tissue-specific transcriptional programs.","evidence":"Patient iPSC and small-molecule agonist differentiation assays; T cell-specific and hepatocyte-specific Atf6 knockouts with in vivo phenotypes","pmids":["29440509","37209959","30504459"],"confidence":"Medium","gaps":["Direct ATF6 target genes in each lineage incompletely defined","Whether these roles depend on canonical proteolytic activation untested in some contexts"]},{"year":2019,"claim":"Connected ATF6 to growth signaling and apoptotic control, identifying RHEB as a direct cardiac ATF6 target activating mTORC1-driven hypertrophy and showing ATF6 shapes CHOP induction dynamics and cell-fate decisions.","evidence":"Cardiac-specific Atf6 cKO with ChIP and AAV9-RHEB rescue; BAC-GFP reporters, live imaging, and mathematical modeling of UPR branches","pmids":["30582446","32058971"],"confidence":"High","gaps":["How ATF6 balances pro-survival vs pro-apoptotic outputs unresolved","Quantitative contribution of each UPR arm to cell fate not fully apportioned"]},{"year":2021,"claim":"Resolved the ubiquitin/proteasome regulation of ATF6, identifying RNF186-mediated K152 ubiquitination downstream of NOD2, OTUB1-mediated deubiquitination/stabilization, and a GRINA-HRD1 degradation complex, defining a regulatory layer controlling ATF6 amount and signaling in immunity, cancer, and organ injury.","evidence":"Site-specific ubiquitination mapping, co-IP/MS complex identification, deubiquitinase assays, and multiple KO/transgenic mouse models","pmids":["34623328","33686769","39855351"],"confidence":"High","gaps":["Hierarchy and competition among these ubiquitin enzymes unresolved","Whether K152 modification alters trafficking vs stability not fully separated"]},{"year":2021,"claim":"Cemented ATF6 as essential for retinal proteostasis and cone development, showing ATF6-null organoids fail cone formation while rods develop, and ATF6 is required to clear misfolded P23H rhodopsin, with agonists rescuing some disease alleles.","evidence":"CRISPR-null hESCs, patient iPSC organoids, Atf6/P23H double mutant mice, patient retinal imaging, and small-molecule agonist rescue","pmids":["34561305","34381136"],"confidence":"High","gaps":["Why cones uniquely require ATF6 mechanistically unexplained","Therapeutic window for agonist rescue in patients undefined"]},{"year":null,"claim":"How the multiple activation inputs (BiP release, lipid sensing, p38 phosphorylation) and abundance-control enzymes (RNF186, OTUB1, GRINA-HRD1) are integrated to produce tissue-specific ATF6 transcriptional outputs remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coordinating proteolytic, phosphorylation, and ubiquitin control","Determinants of cell-type-specific ATF6 target gene selection unknown","Structural basis of ATF6 partner choice (SREBP2, SRF, Runx2) undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,14,21,22]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,9,14,22,30]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,17]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,11,26]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[6,10,13]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8,3]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[2,11,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,14,22]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,26,31,34]}],"complexes":["GRINA-HRD1-ATF6 ubiquitination complex"],"partners":["BIP/HSPA5","SREBP2","SRF","RNF186","OTUB1","GRINA","RUNX2","VAPB"],"other_free_text":[]}},"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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This interaction was detected by yeast two-hybrid screen and confirmed in vitro. An ATF6-VP16 chimera activated SRE reporter expression, and antisense ATF6 reduced serum induction of c-fos, indicating ATF6 participates in SRF-dependent transcription.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro binding assay, reporter gene assay, antisense inhibition\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus in vitro binding plus functional reporter assay, single lab\",\n      \"pmids\": [\"9271374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ATF6 binds a consensus DNA sequence related to but distinct from ATF1/CREB sites; this ATF6-binding site is specifically activated by ATF6 overexpression and strongly induced by ER stress. A dominant-negative ATF6 blocked ER stress induction of both ATF6-site and GRP78 reporter genes. GAL4-ATF6 was activated by ER stress, demonstrating ATF6 is a direct transcriptional effector of the ER stress response. Human IRE1 (hIRE1) was found sufficient to activate the ATF6 reporter, and dominant-negative hIRE1 blocked it, placing hIRE1 upstream of ATF6.\",\n      \"method\": \"Reporter gene assay, dominant-negative constructs, GAL4 fusion assay, transient transfection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (reporter assay, dominant-negative, epistasis), replicated across multiple constructs in same study\",\n      \"pmids\": [\"10856300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ATF6 was shown to transcriptionally induce XBP1, and only the IRE1-spliced form of XBP1 mRNA produces a highly active transcription factor that efficiently activates the UPR. ATF6-dependent and IRE1-dependent pathways were thus linked, with ATF6 functioning upstream of XBP1 induction.\",\n      \"method\": \"Transcriptional reporter assays, Northern/Western blotting, identification of spliced XBP1 product\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, highly cited, defines pathway ordering between ATF6 and IRE1/XBP1 arms\",\n      \"pmids\": [\"11779464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ATF6's N-terminal 93 amino acids contain a domain homologous to the VP16 viral protein (VN8 region) that is simultaneously required for transcriptional activation and rapid proteasomal degradation. Point mutations in this VN8-like domain caused loss of transcriptional activity, increased ATF6 expression levels, and increased half-life, demonstrating that potent transcriptional activity and rapid proteasome-mediated turnover of ATF6 are co-regulated by this domain.\",\n      \"method\": \"Deletion and point mutagenesis, reporter gene assay, proteasome inhibitor treatment, protein half-life measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with functional transcription and stability assays in single rigorous study\",\n      \"pmids\": [\"11909875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The ER chaperone BiP/GRP78 binds ATF6 and retains it in the ER; dissociation of BiP from ATF6 upon ER stress initiates ATF6 transport to the Golgi for proteolytic activation. BiP thus acts as a key sensor of ER folding capacity controlling ATF6 activation.\",\n      \"method\": \"Review/commentary citing experimental evidence from same issue (co-immunoprecipitation and trafficking assays described in referenced primary paper)\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — commentary citing primary experimental work; BiP-ATF6 interaction well established but this PMID is secondary commentary\",\n      \"pmids\": [\"12110159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATF6's N-terminal fragment (ATF6(N)) directly binds SREBP2(N) via its leucine-zipper domain, as shown by GST pull-down and co-immunoprecipitation. ATF6(N) forms a complex with SREBP2(N) on sterol response elements (ChIP assay) and recruits HDAC1 to this complex, thereby attenuating SREBP2-mediated lipogenic transcription. Glucose deprivation activates ATF6 and suppresses SREBP2 target genes, and blocking ATF6 cleavage (by BiP overexpression) reverses this inhibitory effect.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter gene assay, deletion analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal biochemical methods (pull-down, co-IP, ChIP, reporter) in single study demonstrating direct interaction and mechanism\",\n      \"pmids\": [\"14765107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ER stressors transcriptionally upregulate ATF6 mRNA expression. This upregulation is mediated by proteolytically cleaved p50-ATF6 binding to putative ATF6-binding elements in the ATF6 promoter, creating a positive autoregulatory feedback loop. Inhibition of S1P (the protease that cleaves ATF6) suppressed ATF6 mRNA upregulation.\",\n      \"method\": \"RT-PCR, promoter reporter assay, S1P inhibitor treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter plus S1P inhibitor plus RT-PCR, single lab\",\n      \"pmids\": [\"17307147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VAPA and VAPB MSP domains interact directly with ER-localized ATF6. Overexpression of VAPB or the ALS-associated mutant VAPB(P56S) attenuates ATF6-regulated transcriptional activity, with the P56S mutant being a more potent inhibitor of ATF6 activity.\",\n      \"method\": \"Co-immunoprecipitation, transcriptional reporter assay, overexpression studies\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus functional reporter assay, single lab\",\n      \"pmids\": [\"18263603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Simulated ischemia (sI) in cardiac myocytes causes ATF6 to translocate from the ER to nuclear fractions. An ERSE in the GRP78 promoter not previously required for other ER stresses was found to bind ATF6 and was critical for maximal ischemia-mediated GRP78 induction. Dominant-negative ATF6 or ATF6-targeted miRNA blocked sI-mediated GRP78 induction and increased cardiac myocyte death upon reperfusion, establishing ATF6 as the key mediator of the ischemic ER stress response.\",\n      \"method\": \"Subcellular fractionation, ChIP/EMSA, dominant-negative ATF6, miRNA knockdown, cell death assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (fractionation, EMSA, dominant-negative, miRNA KD, cell viability) in single study\",\n      \"pmids\": [\"19622751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BMP2 induces ATF6 expression and activation in osteoblasts through Runx2 directly binding to an OSE2 motif (-205 to -200 bp) in the Atf6 promoter. ATF6 in turn directly binds an ATF6-binding motif in the osteocalcin (Oc) promoter to induce Oc expression. Dominant-negative ATF6 blocked BMP2/Runx2-induced osteocalcin expression, and BMP2-induced ATF6 activation was absent in Runx2-/- osteoblasts.\",\n      \"method\": \"ChIP assay, promoter reporter assay, dominant-negative ATF6, Runx2-/- cells, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP plus reporter assay plus KO rescue, multiple orthogonal methods in single study\",\n      \"pmids\": [\"22102412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The PERK/eIF2α~P/ATF4 pathway is required not only for translational control but also for activation of ATF6 and its target genes during ER stress. PERK facilitates both the synthesis of ATF6 and trafficking of ATF6 from the ER to the Golgi for intramembrane proteolysis. Liver-specific PERK depletion significantly reduces ATF6 activation.\",\n      \"method\": \"Genetic knockdown/knockout of PERK, immunoblot, subcellular fractionation, liver-specific conditional knockout\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout combined with fractionation and biochemical assays, multiple cell and in vivo models\",\n      \"pmids\": [\"21917591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ATF6 possesses two mechanistically distinct activation pathways: (1) a luminal domain-dependent pathway activated by proteotoxic/ER stress, and (2) a transmembrane domain-dependent pathway activated by specific sphingolipids dihydrosphingosine (DHS) and dihydroceramide (DHC). Single point mutations in a newly identified transmembrane domain motif selectively abolish DHS/DHC-mediated activation while leaving proteotoxic stress activation intact.\",\n      \"method\": \"Site-directed mutagenesis, lipid addition assays, UPR reporter assays, pharmacological induction\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure-function mutagenesis identifying distinct activation domains, orthogonal reporter assays, single rigorous study\",\n      \"pmids\": [\"30086303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ATF6 directly binds the XBP1 promoter to enhance XBP1 expression; both ATF6 and IRE1α synergistically regulate endogenous XBP1S gene expression in osteoarthritis cartilage. siRNA knockdown experiments confirmed ATF6's role upstream of XBP1S.\",\n      \"method\": \"ChIP assay, siRNA knockdown, promoter analysis, Western blotting\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP and siRNA in single lab, limited orthogonal validation\",\n      \"pmids\": [\"24269637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The ASK1-MKK3/MKK6-p38 MAPK pathway controls ATF6 activity downstream of IFN-γ signaling. p38 MAPK phosphorylates a critical threonine residue in ATF6 upstream of its DNA binding domain. ATF6 mutants defective for p38 MAPK phosphorylation fail to undergo proteolytic processing in the Golgi and cannot drive IFN-γ-induced gene expression or autophagy.\",\n      \"method\": \"Kinase assay (p38 MAPK phosphorylation), site-directed mutagenesis, pharmacological inhibition of ASK1/MKK/p38, reporter assay, ASK1-/- mice\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of phosphorylation site, kinase pathway inhibition, and in vivo mouse model in single study\",\n      \"pmids\": [\"25135476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ATF6 induces a program of oxidative stress response genes (including catalase) in addition to canonical ER chaperone genes. ER stress response elements (ERSEs) were identified in the catalase gene promoter and shown to bind ATF6 in cardiac myocytes, increasing catalase promoter activity. ATF6 knockout hearts showed increased ROS and damage after ischemia/reperfusion that was rescued by catalase overexpression, establishing catalase as a functional ATF6 target linking ER and oxidative stress responses.\",\n      \"method\": \"Gene array, EMSA/ChIP (ERSE-ATF6 binding), ATF6 KO mice, AAV9-mediated ATF6 overexpression, catalase overexpression rescue, I/R model\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ChIP, KO mice, rescue experiments) replicated in cells and in vivo\",\n      \"pmids\": [\"27932512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Achromatopsia-associated ATF6 mutations fall into three mechanistic classes: Class 1 — impaired ER-to-Golgi trafficking and diminished regulated intramembrane proteolysis and transcriptional activity; Class 2 — intact cytosolic domain with constitutive transcriptional activity even without ER stress; Class 3 — complete loss of transcriptional activity due to absent or defective bZIP domains. Patient fibroblasts with Class 1 or Class 3 mutations show increased cell death in response to ER stress.\",\n      \"method\": \"Functional ATF6 mutation analysis, subcellular trafficking assays, proteolytic processing assays, transcriptional reporter assays, patient fibroblast cell death assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — comprehensive functional characterization of disease mutations using multiple orthogonal methods across many mutants\",\n      \"pmids\": [\"28028229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The small molecule 147 (N-(2-hydroxy-5-methylphenyl)-3-phenylpropanamide) preferentially activates ATF6 through metabolic oxidation to an electrophile that covalently modifies ER-resident proteins including protein disulfide isomerases (PDIs). Genetic depletion of PDIs perturbs 147-dependent induction of the ATF6 target gene BiP, implicating PDI modification in ATF6-selective activation. Thus 147 functions as a pro-drug that activates ATF6 via localized ER-targeted covalent modification.\",\n      \"method\": \"Chemical proteomics (identification of covalently modified proteins), genetic PDI depletion, target gene induction assay, metabolic activation studies\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — chemical proteomics plus genetic depletion plus functional assays, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"30084354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of ATF6 expression results in uncontrolled IRE1 signaling and increased XBP1 splicing. The transcriptionally active N-terminal domain of ATF6 reversed increases in IRE1 mRNA and protein levels induced by ER stress, establishing ATF6 as a negative regulator ('off-switch') of IRE1 signaling. IRE1 transcription is regulated through a positive feed-forward loop involving IRE1 kinase activity and downstream JNK.\",\n      \"method\": \"shRNA-mediated ATF6 silencing, live-cell fluorescent UPR reporter assay, IRE1 overexpression with ATF6-N-terminal domain rescue, JNK/IRE1 kinase inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ATF6 KD plus rescue with active domain plus reporter assays, multiple orthogonal methods\",\n      \"pmids\": [\"30287689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 is required for EDEM1-regulated ER export; silencing EDEM1 increases ATF6 bioavailability by stabilizing the natively unstable ATF6 protein, enhancing its export to the Golgi for S1P/S2P cleavage. A somatic EDEM1 variant (N198I) found in hepatocellular carcinoma alters ATF6 signaling.\",\n      \"method\": \"siRNA phenotypic screen, ATF6 stability assays, EDEM1 silencing and variant analysis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA screen plus stability assays, single lab, limited mechanistic depth reported in abstract\",\n      \"pmids\": [\"30281916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 is induced by STAT6 in TH2 cells and STAT3 in TH17 cells, and ATF6 promotes TH2 and TH17 differentiation and cytokine secretion. T cell-specific Atf6 deficiency impaired TH2 and TH17 responses in vitro and in vivo and attenuated mixed granulocytic experimental asthma.\",\n      \"method\": \"Conditional T cell-specific Atf6 knockout mice, in vitro differentiation assays, cytokine measurement, in vivo asthma model\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with in vitro and in vivo phenotypes, single lab\",\n      \"pmids\": [\"37209959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 promotes mesodermal cell fate during differentiation of human stem cells. Pharmacological ATF6 activation suppressed pluripotency and directed mesodermal differentiation; conversely, iPSCs from patients with ATF6 loss-of-function mutations showed impaired mesodermal differentiation.\",\n      \"method\": \"Small-molecule ATF6 agonist activation, patient iPSC lines with ATF6 mutations, transcriptome analysis of germ layer markers\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological activation plus patient iPSC loss-of-function, single lab, two orthogonal approaches\",\n      \"pmids\": [\"29440509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 induces the tPA gene (Plat) in hepatocytes; the co-repressor DACH1 represses ATF6, thereby reducing hepatocyte Plat expression and circulating tPA. Hepatocyte-ATF6 knockout mice show decreased plasma tPA, fibrinolytic activity, and altered thrombosis parameters, establishing a DACH1-ATF6-tPA axis controlling systemic fibrinolysis.\",\n      \"method\": \"Hepatocyte-specific ATF6 knockout mice, DACH1 knockout mice, hepatocyte Plat silencing, measurement of plasma tPA and fibrinolytic activity\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO mice plus in vivo functional readouts, multiple genetic models converging on same pathway\",\n      \"pmids\": [\"30504459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATF6 transcriptionally induces RHEB (Ras homologue enriched in brain), an activator of mTORC1, during cardiac hypertrophy. Cardiac myocyte-specific ATF6 deletion blunted hypertrophy and mTORC1 activation in response to pressure overload and exercise; ectopic RHEB expression restored hypertrophy in ATF6 cKO hearts. ChIP identified RHEB as a direct ATF6 target gene in the heart.\",\n      \"method\": \"Cardiac myocyte-specific Atf6 conditional knockout, transcript profiling, ChIP, AAV9-RHEB rescue, transverse aortic constriction and exercise models\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO, ChIP, in vivo rescue experiments, multiple complementary models\",\n      \"pmids\": [\"30582446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ATF6 shapes the early dynamics of pro-apoptotic CHOP during the UPR. Mathematical modeling and siRNA knockdown of individual UPR branches showed that ATF6 is required for full CHOP induction dynamics, with ATF6 acting as an important regulator of CHOP and therefore cell fate decisions.\",\n      \"method\": \"BAC-GFP reporter cell lines, live-cell microscopy, dynamic mathematical modeling, single siRNA knockdowns\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live reporter imaging plus mathematical modeling plus siRNA perturbations, single lab\",\n      \"pmids\": [\"32058971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In C. elegans, inhibition of the ATF6 ortholog (atf-6) increases lifespan by modulating calcium homeostasis: atf-6 loss downregulates the ER calcium buffer calreticulin, and ER calcium release via IP3R (itr-1) is required for longevity. Mitochondrial calcium import channel mcu-1 is also required for the longevity conferred by atf-6 loss, revealing an ER-mitochondria calcium signaling axis downstream of atf-6.\",\n      \"method\": \"C. elegans genetic loss-of-function, epistasis analysis with itr-1 (IP3R) and mcu-1 mutants, lifespan assays, calcium flux measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in C. elegans with lifespan and calcium readouts, ortholog study\",\n      \"pmids\": [\"32905769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ATF6 decreases the activation of cardiac fibroblasts in response to TGFβ by suppressing fibroblast contraction and α-smooth muscle actin (αSMA) induction through inhibition of the TGFβ-Smad signaling axis. ATF6 silencing or deletion hyperactivated fibroblasts.\",\n      \"method\": \"ATF6 activation (pharmacological), siRNA knockdown, ATF6 knockout fibroblasts, contraction assay, αSMA measurement\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological activation plus genetic deletion plus functional cellular assays, single lab\",\n      \"pmids\": [\"32085622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF186, an E3 ubiquitin ligase, ubiquitinates ATF6 at lysine 152 upon NOD2 pattern recognition receptor stimulation in human macrophages. RNF186 localizes to the ER and forms a complex with ER stress sensors including ATF6; this ubiquitination promotes UPR activation, cytokine secretion, and antimicrobial pathway induction. IBD-associated RNF186 risk variants reduce NOD2-induced ATF6 ubiquitination and downstream outcomes.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with K152 mutagenesis, RNF186-deficient cells, ATF6-deficient mice, in vivo infection models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — site-specific ubiquitination mapping (K152), co-IP complex formation, KO mice with in vivo validation, disease variant functional analysis\",\n      \"pmids\": [\"34623328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"OTUB1 (deubiquitinase otubain 1) stabilizes ATF6 by inhibiting its ubiquitylation in response to ER stress, thereby activating ATF6 signaling and promoting bladder cancer progression. Genetic ablation of OTUB1 inhibited ATF6 target gene expression and cancer cell proliferation.\",\n      \"method\": \"Luciferase pathway screening, OTUB1 knockout (in vitro and in vivo), ubiquitylation assay\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — luciferase screening plus ubiquitylation assay plus KO phenotype, single lab\",\n      \"pmids\": [\"33686769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATF6 is essential for human cone photoreceptor development. Retinal organoids from ATF6-null hESCs or achromatopsia patient iPSCs failed to form cone structures and lost cone phototransduction gene expression, while rod photoreceptors developed normally. A selective small-molecule ATF6 agonist restored transcriptional activity of some ATF6 disease variants and stimulated cone growth in patient organoids.\",\n      \"method\": \"CRISPR/Cas9 ATF6 null hESCs, patient iPSC retinal organoids, gene expression analysis, adaptive optics retinal imaging of patients, small-molecule ATF6 agonist rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic null plus patient iPSC plus pharmacological rescue, corroborated by human patient imaging\",\n      \"pmids\": [\"34561305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATF6 is required for efficient clearance of P23H mutant rhodopsin in rod photoreceptors. Atf6-/- mice expressing P23H rhodopsin accumulate more rhodopsin protein at early ages (without changes in mRNA), and ultimately develop accelerated retinal degeneration compared to Atf6+/- controls.\",\n      \"method\": \"Atf6 knockout combined with P23H rhodopsin knock-in, rhodopsin protein and mRNA quantification, retinal layer thickness measurement\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic double mutant model with molecular and histological readouts, single lab\",\n      \"pmids\": [\"34381136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATF6 directly binds the promoter of p53 and AIFM2 to promote their transcription in severe acute pancreatitis (SAP). ATF6 knockout in SAP mice attenuated acinar injury and apoptosis; AIFM2 overexpression re-established pathological disorder in ATF6-KO SAP mice. p53 knockout significantly suppressed acinar apoptosis and injury.\",\n      \"method\": \"ATF6 knockout mice, ChIP-qPCR, luciferase reporter assay, adenovirus-mediated overexpression/knockdown, proteomics\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase plus KO with rescue experiments, single lab\",\n      \"pmids\": [\"32724472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GRINA interacts directly with ATF6 and recruits HRD1 to form a multiprotein complex that catalyzes ATF6 polyubiquitination, promoting ATF6 degradation. This GRINA-HRD1-ATF6 complex suppresses ER autophagy (ER-phagy) and protects hepatocytes from ischemia-reperfusion injury. Inhibition of ATF6 degradation attenuated the protective effects of GRINA.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ubiquitination assay, hepatocyte-specific Grina KO and transgenic mice, RNA sequencing\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — co-IP complex identification, ubiquitination assay, genetic KO and OE mice with functional rescue, multiple orthogonal methods\",\n      \"pmids\": [\"39855351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ATF6a interacts directly with Runx2 protein and augments Runx2-mediated hypertrophic chondrocyte differentiation. Overexpression of ATF6/ATF6a enhanced chondrogenesis and mineralization; ATF6a knockdown suppressed chondrocyte differentiation. ATF6a also regulated IHH and PTHrP signaling during chondrocyte hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation (ATF6a-Runx2 interaction), siRNA knockdown, adenoviral overexpression, in vitro differentiation assay, immunohistochemistry\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus functional differentiation assays, single lab\",\n      \"pmids\": [\"26527399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BCAA/BCKA (branched chain amino acids and keto acids, specifically valine and leucine but not isoleucine) transcriptionally upregulate PPAR-α through the GCN2/ATF6 pathway. In a genetic mouse model with BCAA catabolic defects, adenovirus-mediated PPAR-α silencing reversed the increased fatty acid oxidation and cardiac I/R vulnerability caused by BCAA accumulation.\",\n      \"method\": \"Seahorse metabolic flux analysis, BCAA oral gavage mouse model, genetic BCAA catabolic defect model, adenovirus-mediated PPAR-α silencing\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo genetic models with metabolic rescue, single lab; ATF6 pathway placement inferred from genetic evidence\",\n      \"pmids\": [\"32373236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATF6 transcriptional programs (activated independently of stress using a small molecule) remodel the ER proteostasis network in ways that are distinct from XBP1s programs and differentially influence folding, trafficking, and degradation of destabilized ER client proteins. Quantitative proteomics defined the specific proteostasis factors upregulated by ATF6 versus XBP1s.\",\n      \"method\": \"Orthogonal small-molecule-mediated ATF6/XBP1s activation, transcriptomics, quantitative proteomics\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transcriptomics plus quantitative proteomics with specific ATF6 activation, single lab\",\n      \"pmids\": [\"23583182\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATF6 is an ER-transmembrane basic-leucine zipper transcription factor that, upon ER stress (or specific sphingolipid signals via its transmembrane domain), dissociates from the retaining chaperone BiP, traffics to the Golgi where it is cleaved by S1P and S2P proteases (regulated by p38 MAPK phosphorylation at a critical threonine and by ubiquitination at K152 via RNF186, with deubiquitination by OTUB1 and degradation promoted by GRINA-HRD1 complexes), releasing an N-terminal fragment that translocates to the nucleus to bind ERSE/ATF6-consensus sites and drive transcription of ER chaperones, XBP1, RHEB (activating mTORC1 for cardiac hypertrophy), tPA (fibrinolysis), catalase (oxidative stress defense), and other targets; ATF6 also directly binds SREBP2 via its leucine zipper to recruit HDAC1 and suppress lipogenesis, interacts with SRF to modulate immediate-early gene transcription, and acts as an off-switch for IRE1 signaling, while its activity is subject to autoregulatory transcriptional feedback and rapid proteasomal degradation mediated by a VN8-like N-terminal domain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ATF6 is an ER-resident basic-leucine zipper transcription factor that serves as one of the three principal effector arms of the unfolded protein response, converting ER stress into a transcriptional program that restores proteostasis [#1, #2]. Under homeostatic conditions ATF6 is retained in the ER through binding by the chaperone BiP/GRP78, whose dissociation upon ER stress licenses ATF6 trafficking to the Golgi for regulated intramembrane proteolysis [#4]. ATF6 carries two mechanistically separable activation inputs: a luminal-domain pathway responsive to proteotoxic stress and a transmembrane-domain pathway activated by the sphingolipids dihydrosphingosine and dihydroceramide [#11]. Proteolytic release of the N-terminal fragment generates a nuclear transcription factor that binds ATF6-consensus/ERSE elements; this same N-terminal region contains a VP16-like (VN8) domain that couples potent transactivation to rapid proteasomal turnover [#3]. The cleaved fragment drives chaperone and proteostasis genes and induces XBP1, integrating the ATF6 and IRE1 arms while also acting as a negative off-switch that restrains IRE1/XBP1s signaling [#2, #17, #34]. Beyond canonical UPR targets, ATF6 directly induces tissue- and context-specific genes including catalase for oxidative-stress defense [#14], RHEB to activate mTORC1 during cardiac hypertrophy [#22], and tPA (Plat) for hepatic fibrinolysis [#21], and it suppresses lipogenesis by binding SREBP2 through its leucine zipper to recruit HDAC1 [#5]. ATF6 activity is tuned by post-translational control: p38 MAPK phosphorylation of a threonine upstream of the DNA-binding domain is required for Golgi processing [#13], while ubiquitination at K152 by RNF186, deubiquitination/stabilization by OTUB1, and degradation via a GRINA-HRD1 complex set ATF6 abundance and signaling output [#26, #27, #31]. Loss-of-function ATF6 mutations cause achromatopsia and impair cone photoreceptor development, with disease alleles falling into trafficking-defective, constitutively active, and transactivation-dead classes [#15, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established ATF6 as a transcriptional cofactor before its UPR role was known, by showing it physically engages SRF to support serum-induced immediate-early gene expression.\",\n      \"evidence\": \"Yeast two-hybrid screen, in vitro binding, and SRE reporter/antisense assays\",\n      \"pmids\": [\"9271374\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not connect ATF6 to ER stress or membrane regulation\", \"Single lab, no structural characterization of the SRF interface\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined ATF6 as a direct transcriptional effector of ER stress with its own consensus DNA element, and placed it downstream of IRE1, answering what ATF6 actually does during the UPR.\",\n      \"evidence\": \"Reporter assays, dominant-negative and GAL4-fusion constructs, epistasis with hIRE1\",\n      \"pmids\": [\"10856300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the proteolytic activation mechanism\", \"Endogenous target gene repertoire not yet mapped\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Linked the ATF6 and IRE1 arms by showing ATF6 induces XBP1 transcription, with only IRE1-spliced XBP1 yielding an active factor, defining pathway ordering within the UPR.\",\n      \"evidence\": \"Reporter assays, Northern/Western blotting, identification of spliced XBP1\",\n      \"pmids\": [\"11779464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ATF6 binding to the XBP1 promoter not yet shown (addressed later)\", \"Functional division of labor between the two arms unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Explained how ATF6 is held inactive and how activation begins, identifying BiP retention in the ER and stress-induced dissociation as the trigger for Golgi trafficking, and identifying the VN8 domain that couples transactivation to rapid degradation.\",\n      \"evidence\": \"Co-IP/trafficking work (cited commentary) and VN8 deletion/point mutagenesis with half-life and proteasome assays\",\n      \"pmids\": [\"12110159\", \"11909875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The S1P/S2P proteolysis step itself not characterized in these entries\", \"Identity of the ubiquitin machinery acting on ATF6 unknown at this time\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed a non-canonical repressive function: cleaved ATF6 directly binds SREBP2 via its leucine zipper and recruits HDAC1 to suppress lipogenic transcription, tying nutrient/ER status to lipid metabolism.\",\n      \"evidence\": \"GST pull-down, co-IP, ChIP, and reporter assays with BiP-overexpression reversal\",\n      \"pmids\": [\"14765107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where this repression dominates not defined\", \"Structural basis of the bZIP-SREBP2 heterodimer unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed ATF6 autoregulates its own promoter through cleaved p50-ATF6, establishing a positive feedback loop that amplifies the UPR response.\",\n      \"evidence\": \"RT-PCR, promoter reporter assay, S1P inhibitor treatment\",\n      \"pmids\": [\"17307147\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ChIP occupancy of the ATF6 promoter not shown\", \"How feedback is terminated unaddressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected ATF6 to additional regulatory inputs and target programs: PERK/ATF4 facilitates ATF6 synthesis and ER-to-Golgi trafficking, and BMP2/Runx2 drives ATF6 to induce osteocalcin, expanding ATF6 beyond generic stress.\",\n      \"evidence\": \"PERK conditional knockout with fractionation; ChIP, promoter reporters, Runx2-/- osteoblasts with dominant-negative ATF6\",\n      \"pmids\": [\"21917591\", \"22102412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which PERK promotes ATF6 trafficking not molecularly defined\", \"Whether Runx2 control of ATF6 generalizes beyond bone unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovered a second, lipid-sensing activation route, showing ATF6 transmembrane-domain mutations selectively abolish dihydrosphingosine/dihydroceramide activation while sparing proteotoxic activation.\",\n      \"evidence\": \"Transmembrane motif mutagenesis, lipid addition, and UPR reporter assays\",\n      \"pmids\": [\"30086303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How sphingolipids are sensed by the transmembrane domain mechanistically unknown\", \"In vivo relevance of lipid-driven ATF6 activation not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified phosphorylation control of ATF6 processing, showing the ASK1-MKK3/6-p38 axis phosphorylates a threonine required for Golgi cleavage and IFN-γ-driven gene expression and autophagy.\",\n      \"evidence\": \"Kinase assay, phosphosite mutagenesis, pathway inhibitors, and ASK1-/- mice\",\n      \"pmids\": [\"25135476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation enables proteolysis mechanistically unresolved\", \"Cross-talk with BiP release not integrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Broadened the ATF6 target program to oxidative-stress defense, identifying catalase as a direct ATF6 target whose induction protects the ischemic heart.\",\n      \"evidence\": \"Gene array, EMSA/ChIP, ATF6 KO mice, AAV9 overexpression, and catalase rescue in I/R\",\n      \"pmids\": [\"27932512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Breadth of the ATF6 oxidative-stress regulon beyond catalase undefined\", \"Tissue specificity of this program not delineated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the disease mechanism of ATF6 loss by classifying achromatopsia mutations into trafficking-defective, constitutively active, and transactivation-dead classes with distinct cellular consequences.\",\n      \"evidence\": \"Functional analysis of patient mutations: trafficking, proteolysis, reporter, and fibroblast death assays\",\n      \"pmids\": [\"28028229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why retinal cones are selectively vulnerable not explained here\", \"Whether constitutively active alleles are gain-of-function in vivo unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established ATF6 abundance as a tunable control point and dissected ATF6-specific proteostasis output: EDEM1 limits ATF6 stability/export, ATF6 acts as a negative off-switch on IRE1, and ATF6 vs XBP1s programs remodel proteostasis differently; selective small molecules (e.g. compound 147) activate ATF6 via ER-localized covalent PDI modification.\",\n      \"evidence\": \"siRNA stability screens, shRNA silencing with N-terminal rescue, UPR reporters, quantitative proteomics, and chemical proteomics with PDI depletion\",\n      \"pmids\": [\"30281916\", \"30287689\", \"23583182\", \"30084354\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ATF6 represses IRE1 transcription mechanistically unresolved\", \"Direct ATF6 targets distinguishing it from XBP1s not all mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated cell-fate and developmental roles for ATF6 across mesoderm specification, TH2/TH17 differentiation, and hepatic fibrinolysis, showing it drives lineage- and tissue-specific transcriptional programs.\",\n      \"evidence\": \"Patient iPSC and small-molecule agonist differentiation assays; T cell-specific and hepatocyte-specific Atf6 knockouts with in vivo phenotypes\",\n      \"pmids\": [\"29440509\", \"37209959\", \"30504459\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ATF6 target genes in each lineage incompletely defined\", \"Whether these roles depend on canonical proteolytic activation untested in some contexts\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected ATF6 to growth signaling and apoptotic control, identifying RHEB as a direct cardiac ATF6 target activating mTORC1-driven hypertrophy and showing ATF6 shapes CHOP induction dynamics and cell-fate decisions.\",\n      \"evidence\": \"Cardiac-specific Atf6 cKO with ChIP and AAV9-RHEB rescue; BAC-GFP reporters, live imaging, and mathematical modeling of UPR branches\",\n      \"pmids\": [\"30582446\", \"32058971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ATF6 balances pro-survival vs pro-apoptotic outputs unresolved\", \"Quantitative contribution of each UPR arm to cell fate not fully apportioned\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the ubiquitin/proteasome regulation of ATF6, identifying RNF186-mediated K152 ubiquitination downstream of NOD2, OTUB1-mediated deubiquitination/stabilization, and a GRINA-HRD1 degradation complex, defining a regulatory layer controlling ATF6 amount and signaling in immunity, cancer, and organ injury.\",\n      \"evidence\": \"Site-specific ubiquitination mapping, co-IP/MS complex identification, deubiquitinase assays, and multiple KO/transgenic mouse models\",\n      \"pmids\": [\"34623328\", \"33686769\", \"39855351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy and competition among these ubiquitin enzymes unresolved\", \"Whether K152 modification alters trafficking vs stability not fully separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cemented ATF6 as essential for retinal proteostasis and cone development, showing ATF6-null organoids fail cone formation while rods develop, and ATF6 is required to clear misfolded P23H rhodopsin, with agonists rescuing some disease alleles.\",\n      \"evidence\": \"CRISPR-null hESCs, patient iPSC organoids, Atf6/P23H double mutant mice, patient retinal imaging, and small-molecule agonist rescue\",\n      \"pmids\": [\"34561305\", \"34381136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why cones uniquely require ATF6 mechanistically unexplained\", \"Therapeutic window for agonist rescue in patients undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple activation inputs (BiP release, lipid sensing, p38 phosphorylation) and abundance-control enzymes (RNF186, OTUB1, GRINA-HRD1) are integrated to produce tissue-specific ATF6 transcriptional outputs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating proteolytic, phosphorylation, and ubiquitin control\", \"Determinants of cell-type-specific ATF6 target gene selection unknown\", \"Structural basis of ATF6 partner choice (SREBP2, SRF, Runx2) undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 14, 21, 22]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 9, 14, 22, 30]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 11, 26]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [6, 10, 13]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [2, 11, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 14, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 26, 31, 34]}\n    ],\n    \"complexes\": [\"GRINA-HRD1-ATF6 ubiquitination complex\"],\n    \"partners\": [\"BiP/HSPA5\", \"SREBP2\", \"SRF\", \"RNF186\", \"OTUB1\", \"GRINA\", \"Runx2\", \"VAPB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}