{"gene":"CREB3L1","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1999,"finding":"CREB3L1 (OASIS) was identified as a novel member of the CREB/ATF family of transcription factors, expressed in long-term cultured astrocytes and gliotic tissue, with a putative role in gliotic events based on its induction after cryo-injury of the mouse cerebral cortex.","method":"Differential display screening, in situ hybridization, expression analysis in mouse embryo and injured CNS","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 3 — initial identification by expression; foundational characterization paper","pmids":["10350641"],"is_preprint":false},{"year":2002,"finding":"OASIS/CREB3L1 is a transcriptional activator that activates transcription through box-B elements (but not somatostatin CRE); its C-terminal transmembrane domain anchors it to the ER and represses transcriptional activity, while truncation of the transmembrane domain relocates it to the nucleus and markedly increases transcriptional activity.","method":"Luciferase reporter assays, western blot, subcellular localization by transfection and deletion constructs","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — functional domain dissection with reporter assays and localization","pmids":["12054625"],"is_preprint":false},{"year":2002,"finding":"OASIS/CREB3L1 binds CRE sequences (shown by gel shift assay), has a strong N-terminal transcriptional activation domain rich in acidic amino acids, and contains a C-terminal repression domain not previously described in CREB/ATF members.","method":"Gel shift assay, GAL4-UAS-luciferase reporter assay, deletion construct analysis in COS7 cells","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical binding and functional domain mapping","pmids":["12480185"],"is_preprint":false},{"year":2005,"finding":"OASIS/CREB3L1 is an ER stress transducer: it is a membrane-bound bZIP transcription factor that is cleaved at the membrane in response to ER stress (regulated intramembrane proteolysis), and the released N-terminal cytoplasmic domain translocates to the nucleus where it activates transcription of target genes via ER stress-responsive and cAMP-responsive elements. Overexpression induced BiP and suppressed ER-stress-induced cell death; knockdown reduced BiP and increased susceptibility to ER stress in astrocytes.","method":"Knockdown and overexpression in astrocytes, reporter assays, western blot, nuclear fractionation, BiP induction assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in a high-impact study; foundational mechanism paper","pmids":["15665855"],"is_preprint":false},{"year":2005,"finding":"A novel FUS/CREB3L1 fusion gene was identified in a case of low-grade fibromyxoid sarcoma (LGFMS), where the N-terminal domain of FUS is fused in-frame to CREB3L1 (analogous to the more common FUS/CREB3L2 fusion), establishing CREB3L1 rearrangement as an alternative oncogenic driver in LGFMS.","method":"RT-PCR, sequencing, histopathologic analysis across multiple centers","journal":"Laboratory investigation","confidence":"High","confidence_rationale":"Tier 2 — molecular identification confirmed by sequencing, replicated across multiple tumor centers","pmids":["15640831"],"is_preprint":false},{"year":2006,"finding":"OASIS/CREB3L1 is processed by Site-1 Protease (S1P) and Site-2 Protease (S2P) — the same Golgi-resident proteases that cleave ATF6 — in response to ER stress, and its cleavage requires translocation to the Golgi apparatus. Unlike ATF6, OASIS does not have a significant luminal Golgi localization signal, suggesting alternative mechanisms for its Golgi translocation.","method":"Protease inhibitor studies, S1P/S2P mutant cell lines, deletion mutant analysis, subcellular fractionation","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 — direct mechanistic identification of the proteases responsible for OASIS cleavage with mutant cell lines","pmids":["16417584"],"is_preprint":false},{"year":2008,"finding":"OASIS/CREB3L1 directly binds a CRE site in the GCMa/Gcm1 promoter and stimulates GCMa transcription in trophoblast cells; knockdown of OASIS in BeWo cells decreased endogenous GCMa mRNA. Overexpression of OASIS in choriocarcinoma cells led to placental cell fusion.","method":"Promoter mapping, reporter assays, siRNA knockdown, gel shift/ChIP, overexpression in trophoblast cell lines","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — promoter binding and functional knockdown with multiple readouts","pmids":["18495750"],"is_preprint":false},{"year":2009,"finding":"OASIS/CREB3L1 is required for bone formation: it activates transcription of Col1a1 (type I collagen) through a UPRE-like sequence in the osteoblast-specific Col1a1 promoter. OASIS-/- mice show severe osteopenia with decreased type I collagen in the bone matrix and dilated rough ER in osteoblasts. BMP2 induces OASIS expression and accelerates its regulated intramembrane proteolysis.","method":"OASIS-/- mouse model, ChIP, reporter assay, histological analysis, BMP2 stimulation experiments","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — combined in vivo knockout, ChIP, reporter assays, and defined cellular phenotype in high-impact journal","pmids":["19767743"],"is_preprint":false},{"year":2010,"finding":"In pancreatic beta-cells, active nuclear OASIS/CREB3L1 upregulates genes involved in extracellular matrix production and protein transport (but not classical UPR genes like BiP/GRP78), demonstrating that the repertoire of OASIS target genes is cell-type dependent. Endogenous OASIS is regulated post-transcriptionally by miR-140 in beta-cells.","method":"Microarray after inducible nuclear OASIS expression in INS-1 cells, reporter assay, miRNA analysis","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide target identification with functional reporter follow-up","pmids":["20668028"],"is_preprint":false},{"year":2010,"finding":"Osteoblast-specific re-expression of OASIS in OASIS-/- mice rescues osteopenia and normalizes type I collagen mRNA levels and rough ER morphology, but does not rescue growth retardation, which is attributed to reduced serum GH and IGF-1 levels — demonstrating distinct osteoblast-dependent and -independent skeletal mechanisms.","method":"Transgenic rescue experiment (osteoblast-specific Col1a1 promoter), histology, RT-PCR, ELISA for GH/IGF-1","journal":"Bone","confidence":"High","confidence_rationale":"Tier 2 — genetic rescue epistasis with multiple orthogonal readouts","pmids":["21047569"],"is_preprint":false},{"year":2011,"finding":"CREB3L1/OASIS is proteolytically cleaved upon infection with diverse DNA and RNA viruses (murine γ-herpesvirus 68, HCV, West Nile virus, Sendai virus), allowing its N-terminus to enter the nucleus and induce cell-cycle inhibitors (including p21) to block proliferation of virus-infected cells. CREB3L1 expression is silenced in proliferating cells harboring HCV or WNV replicons.","method":"Viral infection models, western blot for CREB3L1 cleavage, gene expression analysis, knockdown/overexpression, proliferation assays","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 — multiple virus systems, mechanistic pathway established with KD and overexpression","pmids":["21767813"],"is_preprint":false},{"year":2011,"finding":"EWSR1-CREB3L1 fusion transcript was identified in small cell osteosarcoma; the chimeric protein (~70 kDa) shows nuclear localization (confirmed by immunohistochemistry) rather than the normal perinuclear localization of wild-type CREB3L1, consistent with function as a constitutively active nuclear transcriptional regulator.","method":"RACE, RT-PCR, sequencing, genomic breakpoint confirmation, immunohistochemistry, western blot","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 — molecular characterization with protein-level confirmation and localization","pmids":["21987447"],"is_preprint":false},{"year":2012,"finding":"OASIS/CREB3L1 promotes terminal differentiation of goblet cells in the large intestine: OASIS-/- mice show reduced goblet cell numbers, decreased mucus production, abnormal mucous vesicle and rough ER morphology, decreased mature goblet cell markers, and increased early goblet cell markers. OASIS is activated by mild ER stress during goblet cell differentiation.","method":"OASIS-/- mouse model, morphological analysis, in vitro knockdown in goblet cell culture model, marker expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout with defined cellular phenotype and in vitro mechanistic validation","pmids":["22262831"],"is_preprint":false},{"year":2012,"finding":"HRD1, an ER-resident E3 ubiquitin ligase, ubiquitinates and destabilizes OASIS/CREB3L1 under normal conditions via the ubiquitin-proteasome pathway. ER stress dissociates the HRD1-OASIS interaction, stabilizing OASIS and enabling its transcriptional activity. Stabilization of OASIS in Hrd1-/- cells enhances collagen fiber production during osteoblast differentiation.","method":"Co-immunoprecipitation, HRD1 knockout cells, ubiquitination assay, proteasome inhibitor studies, collagen production assay","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 — direct biochemical identification of E3 ligase, reciprocal Co-IP, genetic validation in Hrd1-/- cells","pmids":["22705851"],"is_preprint":false},{"year":2012,"finding":"OASIS/CREB3L1 is required for astrocyte differentiation from neural precursor cells: OASIS-/- mouse cortices contain fewer astrocytes and more neural precursor cells during embryonic development. OASIS directly induces Gcm1 transcription (a target required for astrocyte differentiation in Drosophila), and Gcm1 introduction into OASIS-/- NPCs rescues differentiation by accelerating Gfap promoter demethylation.","method":"OASIS-/- mouse model, primary NPC culture, Gcm1 rescue experiment, GFAP promoter methylation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout, genetic rescue, and epigenetic mechanism identification","pmids":["22828627"],"is_preprint":false},{"year":2012,"finding":"Doxorubicin stimulates de novo ceramide synthesis, which activates CREB3L1 by stimulating its proteolytic cleavage by Site-1 Protease and Site-2 Protease. The released N-terminal domain enters the nucleus and activates transcription of cell-cycle inhibitors including p21. Knockdown of CREB3L1 confers doxorubicin resistance; overexpression enhances sensitivity.","method":"Ceramide synthesis inhibitors, S1P/S2P inhibitor studies, siRNA knockdown, overexpression, cell proliferation assays, nuclear fractionation","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — mechanistic pathway with pharmacological and genetic intervention, multiple cell lines","pmids":["23256041"],"is_preprint":false},{"year":2013,"finding":"EWSR1-CREB3L1 fusion transcripts were identified as the predominant genetic event in pure sclerosing epithelioid fibrosarcoma (SEF) by RT-PCR and mRNA sequencing, distinct from FUS-CREB3L2 fusions in LGFMS, supporting these as different tumor types with different molecular drivers.","method":"FISH, RT-PCR, mRNA sequencing in 10 primary SEF tumors","journal":"The American journal of surgical pathology","confidence":"Medium","confidence_rationale":"Tier 2 — molecular characterization by multiple methods in a series of tumors","pmids":["24441665"],"is_preprint":false},{"year":2013,"finding":"CREB3L1 suppresses metastasis in breast cancer: reintroduction of CREB3L1 into metastatic cells reduced invasion and migration in vitro, and in vivo led to regression of primary tumors in 70% of animals via impaired angiogenesis. ChIP-on-chip identified direct CREB3L1 target genes, including genes involved in angiogenesis that are repressed by CREB3L1.","method":"Transfection of metastatic cells, in vitro invasion/migration assays, in vivo rat mammary tumor model, microarray, ChIP-on-chip","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — combined in vitro and in vivo models with genome-wide ChIP target identification","pmids":["24126059"],"is_preprint":false},{"year":2013,"finding":"In human glioma cell lines, OASIS/CREB3L1 knockdown attenuates the UPR (reduced BiP/GRP78 and GRP94 induction), decreases chondroitin sulfate proteoglycan extracellular matrix proteins, and reduces cell migration. OASIS protein in glioma cells is N-glycosylated at Asn-513.","method":"siRNA knockdown, western blot, ER stress induction, migration assays, glycosylation analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — knockdown with multiple defined phenotypic readouts","pmids":["23335989"],"is_preprint":false},{"year":2013,"finding":"EWSR1-CREB3L1 fusion was found as an alternative molecular aberration in LGFMS, confirmed by DNA sequencing of RT-PCR products and FISH, expanding the genetic spectrum of LGFMS.","method":"RT-PCR, DNA sequencing, FISH","journal":"The American journal of surgical pathology","confidence":"Medium","confidence_rationale":"Tier 2 — molecular confirmation by multiple methods","pmids":["23588368"],"is_preprint":false},{"year":2013,"finding":"CREB3L1 regulates VEGFA transcription in human retinal pigment epithelial cells (ARPE-19): OASIS directly binds a CRE-like site at ~-500 bp of the VEGFA promoter (confirmed by ChIP), and is the most effective UPR transcription factor driving VEGFA promoter activity after ER stress in these cells.","method":"Reporter assays with VEGFA promoter deletion/mutation constructs, ChIP, ER stress induction, comparison of ATF6/XBP1/ATF4/OASIS","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP confirms direct binding; reporter dissection identifies binding site","pmids":["23383089"],"is_preprint":false},{"year":2014,"finding":"TGF-β induces proteolytic activation of CREB3L1 through inhibition of TM4SF20 (which normally inhibits RIP of CREB3L1). The released N-terminal domain enters the nucleus and binds Smad4 to activate transcription of genes encoding collagen assembly extracellular matrix proteins, providing a mechanism for sustained TGF-β-induced collagen synthesis.","method":"TGF-β treatment of A549 cells, TM4SF20 knockdown/overexpression, Co-IP of CREB3L1 N-terminal domain with Smad4, reporter assay, western blot for RIP","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — identified regulatory factor (TM4SF20), binding partner (Smad4), and downstream targets with Co-IP and functional assays","pmids":["25310401"],"is_preprint":false},{"year":2014,"finding":"OASIS/CREB3L1 is epigenetically silenced by promoter hypermethylation in bladder cancer, and re-expression suppresses tumor cell migration and colony growth. HTRA3 was identified as a putative target gene of CREB3L1 in invasive bladder cancer cells.","method":"Pyrosequencing of CpG methylation, siRNA re-expression, migration assay, colony assay, target gene identification","journal":"Epigenetics","confidence":"Medium","confidence_rationale":"Tier 2 — epigenetic mechanism with functional rescue and target gene identification","pmids":["25625847"],"is_preprint":false},{"year":2015,"finding":"OASIS/CREB3L1 modulates the hypoxia signaling pathway by physically interacting with HIF-1α through its bZIP domain (shown by co-immunoprecipitation), and the OASIS-N fragment promotes transcription of HIF-1α target genes (including VEGFA) via hypoxia-response elements. OASIS-deficient mice show decreased VEGFA expression and retarded vascularization in bone tissue.","method":"Co-immunoprecipitation, luciferase reporter assay with HRE, RT-PCR, immunostaining, metatarsal angiogenesis assay in OASIS-/- mice","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — Co-IP identifies direct interaction, combined with in vivo phenotype and reporter validation","pmids":["26558437"],"is_preprint":false},{"year":2015,"finding":"CREB3L1 is a transcriptional regulator of the arginine vasopressin (AVP) gene in rat hypothalamus; cAMP (via forskolin) upregulates Creb3l1 mRNA and protein and increases Avp promoter activity, an effect blunted by Creb3l1 shRNA. Glucocorticoids (dexamethasone) negatively regulate Creb3l1 expression, thereby reducing AVP induction.","method":"shRNA knockdown of Creb3l1 in AtT20 cells and hypothalamic organotypic cultures, AVP promoter reporter assay, in vivo dexamethasone injection","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 — gene silencing with multiple in vitro and in vivo readouts","pmids":["26503226"],"is_preprint":false},{"year":2015,"finding":"In the osmotically challenged rat hypothalamus, CREB3L1 acts as a transcriptional mediator of the ER stress response: dominant-negative CREB3L1 introduced into the SON by lentiviral vector decreased Chop and unspliced Xbp1 mRNA levels, but not BiP or Atf4.","method":"Lentiviral delivery of dominant-negative CREB3L1 into rat SON, RT-PCR for ER stress markers","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo dominant-negative with specific transcriptional readouts","pmids":["25915053"],"is_preprint":false},{"year":2017,"finding":"CREB3L1 acts downstream of PERK kinase specifically in mesenchymal subtype triple-negative breast cancer to mediate pro-metastatic functions: genetic or pharmacological inhibition of CREB3L1 suppresses cancer cell invasion and metastasis, placing CREB3L1 as a key effector of PERK-driven invasion.","method":"PERK inhibitor treatment, CREB3L1 knockdown/overexpression, invasion assays, in vivo metastasis models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — epistasis (PERK→CREB3L1), multiple loss-of-function approaches, in vivo validation","pmids":["29057869"],"is_preprint":false},{"year":2017,"finding":"A pathogenic missense variant p.(Ala304Val) in the bZIP domain of CREB3L1 reduces its DNA-binding ability (shown by luciferase assay) and decreases transcription of SEC23A and SEC24D (COPII components), and reduces SEC24D protein levels, demonstrating a functional link between OASIS and the COPII secretory complex in OI pathogenesis.","method":"In vitro structural modeling, luciferase transcriptional activity assay, overexpression of mutant OASIS, western blot for SEC24D","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional characterization of missense variant with reporter and target protein analysis","pmids":["30657919"],"is_preprint":false},{"year":2017,"finding":"CREB3L1 (OASIS) disruption of a DNA-binding site in the bZIP domain prevents activation of SEC24D transcription in human OI; in a consanguineous family with a CREB3L1 variant causing OI, OASIS fails to act on transcriptional targets including SEC24D (a COPII coat component), linking defective OASIS signaling to impaired secretory pathway function.","method":"Exome sequencing, functional validation by reporter assay, identification of SEC24D as target","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 — genetic and functional evidence linking CREB3L1 to COPII component regulation","pmids":["28817112"],"is_preprint":false},{"year":2017,"finding":"CREB3L1 regulates secretory pathway capacity in thyroid cells: TSH stimulation upregulates CREB3L1, which increases expression of ER-Golgi transport factors and causes Golgi complex expansion; dominant-negative CREB3L1 impairs TSH-induced Golgi expansion, establishing CREB3L1 as a downstream effector coupling cargo load to secretory pathway capacity.","method":"TSH stimulation of thyroid cells, dominant-negative CREB3L1 construct, Golgi volume quantification, transport factor mRNA analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — dominant-negative epistasis with organelle morphology and molecular readouts","pmids":["29093023"],"is_preprint":false},{"year":2017,"finding":"Orphan nuclear receptor Nr4a1 directly activates Creb3l1 transcription by binding a single NBRE site in the Creb3l1 promoter, as a downstream effector of cAMP signaling; shRNA silencing of Nr4a1 in AtT20 cells prevents cAMP-induced Creb3l1 upregulation. CpG methylation of the Creb3l1 proximal promoter determines accessibility of this pathway.","method":"shRNA silencing of Nr4a1, promoter reporter assay with NBRE site mutations, microarray mining, bisulfite methylation analysis","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding identified, genetic validation by shRNA","pmids":["29311806"],"is_preprint":false},{"year":2020,"finding":"CREB3L1 directly regulates transcription of Pcsk1 (encoding prohormone convertase PC1/3) by binding a G-box motif in the Pcsk1 promoter in endocrine cells; overexpression of Creb3l1 in the supraoptic nucleus increases Pcsk1, while knockdown decreases it, establishing CREB3L1 as a regulator of the neuropeptide processing enzyme supply chain.","method":"RNA-seq after Creb3l1 knockdown in AtT20 cells, in vitro promoter activity assay, direct binding studies, viral overexpression/knockdown in rat supraoptic nucleus","journal":"Journal of neuroendocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding, in vitro and in vivo validation","pmids":["32319174"],"is_preprint":false},{"year":2021,"finding":"OASIS/CREB3L1 accumulates as a full-length form (not cleaved) at sites of damaged nuclear envelope (NE) where lamins are depleted, colocalizes with LINC complex components SUN2 and Nesprin-2, and with NE repair factors (BAF, LEM domain proteins, ESCRT-III component). OASIS suppresses DNA damage and restores nuclear shape under NE stress, revealing a novel NE stress response function distinct from its ER stress/RIP function.","method":"Live imaging, immunofluorescence, co-localization with NE repair factors, DNA damage assays, nuclear deformation assays under NE stress","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiments with functional consequence (DNA damage suppression)","pmids":["34226518"],"is_preprint":false},{"year":2022,"finding":"In anaplastic thyroid carcinoma (ATC), CREB3L1 promotes invasion and metastasis by activating ECM signaling (collagen subtypes), and mediates activation of α-SMA-positive cancer-associated fibroblasts (CAFs) through IL-1α production; KPNA2 mediates nuclear translocation of CREB3L1, linking it to downstream ECM gene activation.","method":"CREB3L1 knockdown/overexpression in ATC cells, zebrafish and nude mouse xenograft models, cytokine array screening, single-cell RNA-seq, CAF co-culture assays","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vitro and in vivo models with defined mechanism (KPNA2-mediated nuclear import, IL-1α-CAF axis)","pmids":["36192735"],"is_preprint":false},{"year":2023,"finding":"OASIS/CREB3L1 arrests the cell cycle at G2/M phase after DNA damage by directly inducing p21 transcription, independent of p53. This cell-cycle arrest function is dominant in astrocytes and osteoblasts. In a brain injury model, OASIS-/- reactive astrocytes show sustained proliferation and prolonged gliosis. Epigenomic removal of CREB3L1 promoter hypermethylation in glioblastoma xenografts suppresses tumorigenesis.","method":"OASIS-/- mice, DNA damage assays, flow cytometry for cell cycle, ChIP for p21 promoter, brain injury model, epigenomic engineering in glioblastoma xenografts","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, in vivo models, direct ChIP evidence for p21 as target","pmids":["37178686"],"is_preprint":false},{"year":2023,"finding":"C5a-C5aR1 activates ER stress via the PERK-eIF2α-ATF4 pathway, with CREB3L1 acting as a key downstream mediator that promotes vascular smooth muscle cell osteogenic transdifferentiation and vascular calcification by inducing COL1α1 expression.","method":"VSMC calcification model, C5aR1 antagonist (PMX53), in vivo chronic kidney disease mouse model, pathway inhibition studies, calcium deposition/osteogenic marker assays","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic and pharmacological epistasis placing CREB3L1 downstream of PERK-eIF2α-ATF4 in vascular calcification","pmids":["37603848"],"is_preprint":false},{"year":2014,"finding":"OASIS/CREB3L1 regulates chondroitin 6-O-sulfotransferase 1 (C6ST1) gene transcription in reactive astrocytes: OASIS knockout mice show attenuated CS-C immunoreactivity after brain stab injury, C6ST1 mRNA/protein induction is lost in OASIS-/- injured cortices, and a C-terminal deletion OASIS mutant directly activates C6ST1 transcription through the first intron region, promoting CSPG sulfation and creating a non-permissive environment for axonal regeneration.","method":"OASIS-/- mouse brain stab injury model, RT-PCR, immunostaining, C6ST1 reporter driven by intron 1, neurite outgrowth assays on membrane fractions","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo knockout, direct transcriptional activation of C6ST1 by deletion construct, functional neurite outgrowth readout","pmids":["24716865"],"is_preprint":false}],"current_model":"CREB3L1 (OASIS) is an ER-resident, membrane-bound bZIP transcription factor that, upon stimuli including ER stress, virus infection, doxorubicin/ceramide, TGF-β, or BMP2, undergoes regulated intramembrane proteolysis by Golgi-resident S1P and S2P proteases (normally held in check by HRD1-mediated ubiquitin-proteasome degradation); the released N-terminal domain translocates to the nucleus — a process facilitated by KPNA2 — where it activates cell-type-specific target genes including Col1a1, p21, VEGFA, C6ST1, Pcsk1, and ECM/COPII components (SEC23A, SEC24D), coordinates with Smad4, HIF-1α, and OASIS family members, and mediates diverse physiological processes including bone formation, astrocyte/goblet cell differentiation, antiviral proliferation arrest, metastasis suppression, and Golgi expansion for secretory capacity."},"narrative":{"teleology":[{"year":1999,"claim":"Identifying CREB3L1 as a new CREB/ATF family member expressed in astrocytes established its tissue context and set the stage for functional dissection of a previously unknown ER-associated transcription factor.","evidence":"Differential display screening and in situ hybridization in mouse CNS after cryo-injury","pmids":["10350641"],"confidence":"Medium","gaps":["No function assigned beyond expression pattern","Protein product not characterized biochemically","No target genes identified"]},{"year":2002,"claim":"Domain dissection revealed that CREB3L1 is an ER-anchored transcription factor whose C-terminal transmembrane domain restricts it from the nucleus, establishing the principle that proteolytic release would be required for transcriptional activation.","evidence":"Deletion constructs, reporter assays, and subcellular localization in transfected cells","pmids":["12054625","12480185"],"confidence":"Medium","gaps":["Protease(s) responsible for cleavage not identified","Physiological triggers for activation unknown","Endogenous target genes not determined"]},{"year":2005,"claim":"Demonstrating that ER stress triggers regulated intramembrane proteolysis of CREB3L1 to release a nuclear-translocating N-terminal fragment that induces BiP and protects astrocytes from ER-stress-induced death established CREB3L1 as a bona fide ER stress transducer, paralleling ATF6.","evidence":"Knockdown and overexpression in astrocytes, nuclear fractionation, BiP induction, and cell death assays","pmids":["15665855"],"confidence":"High","gaps":["Identity of the cleaving proteases not yet confirmed","Spectrum of target genes beyond BiP unknown","In vivo physiological relevance not tested"]},{"year":2006,"claim":"Identifying S1P and S2P as the Golgi-resident proteases responsible for CREB3L1 cleavage resolved the enzymatic basis of its activation and placed it within the same RIP pathway as ATF6 and SREBP.","evidence":"S1P/S2P mutant cell lines, protease inhibitors, and deletion mutant analysis","pmids":["16417584"],"confidence":"High","gaps":["Mechanism of CREB3L1 translocation from ER to Golgi unclear (no canonical Golgi localization signal)","Regulation of S1P/S2P access to CREB3L1 not defined"]},{"year":2009,"claim":"The OASIS knockout mouse revealed that CREB3L1 is essential for bone formation by directly activating Col1a1 transcription in osteoblasts, providing the first in vivo loss-of-function phenotype and identifying a key target gene.","evidence":"OASIS−/− mouse with severe osteopenia, ChIP on Col1a1 promoter, BMP2 stimulation experiments","pmids":["19767743"],"confidence":"High","gaps":["Whether the osteopenia phenotype is solely Col1a1-dependent or involves additional targets not resolved","Mechanism linking BMP2 to OASIS RIP not elucidated"]},{"year":2010,"claim":"Osteoblast-specific rescue of OASIS−/− mice normalized bone collagen but not growth retardation, revealing that CREB3L1 has both cell-autonomous (osteoblast) and systemic (GH/IGF-1 axis) roles in skeletal physiology.","evidence":"Transgenic rescue under Col1a1 promoter, histology, serum GH/IGF-1 ELISA","pmids":["21047569"],"confidence":"High","gaps":["Tissue(s) responsible for the GH/IGF-1 deficiency not identified","Direct versus indirect regulation of GH axis by CREB3L1 unclear"]},{"year":2011,"claim":"Demonstrating that diverse viruses trigger CREB3L1 cleavage to induce p21 and block proliferation of infected cells established a novel antiviral function via cell-cycle arrest, independent of the classical UPR.","evidence":"Infection with γ-HV68, HCV, WNV, Sendai virus; CREB3L1 knockdown/overexpression; proliferation assays","pmids":["21767813"],"confidence":"High","gaps":["Viral mechanism triggering CREB3L1 cleavage not defined","Whether viruses actively silence CREB3L1 transcription or select for low-expressing cells unclear"]},{"year":2012,"claim":"Multiple studies converged to show that CREB3L1 drives cell-type-specific differentiation programs: goblet cell maturation in the intestine and astrocyte differentiation from neural precursors (via Gcm1 induction and GFAP promoter demethylation), while HRD1-mediated ubiquitination was identified as the basal degradation mechanism keeping CREB3L1 inactive.","evidence":"OASIS−/− mice (goblet cell and astrocyte phenotypes), Gcm1 rescue of NPC differentiation, Co-IP of HRD1-OASIS, ubiquitination assays in Hrd1−/− cells","pmids":["22262831","22828627","22705851"],"confidence":"High","gaps":["How ER stress dissociates HRD1-OASIS interaction mechanistically not defined","Gcm1 as the sole mediator of astrocyte differentiation downstream of OASIS not confirmed"]},{"year":2012,"claim":"Linking doxorubicin-induced ceramide synthesis to S1P/S2P-mediated CREB3L1 cleavage and p21-dependent growth arrest provided a mechanistic explanation for how this chemotherapeutic agent engages a non-canonical cell-cycle checkpoint.","evidence":"Ceramide synthesis and S1P/S2P inhibitors, siRNA knockdown, overexpression, proliferation assays","pmids":["23256041"],"confidence":"High","gaps":["How ceramide promotes CREB3L1 transit from ER to Golgi not determined","Relevance in clinical doxorubicin resistance not tested in patient samples"]},{"year":2013,"claim":"Genome-wide target identification (ChIP-on-chip) in metastatic breast cancer showed that CREB3L1 directly represses angiogenesis-related genes and suppresses metastasis in vivo, while in retinal epithelial cells it directly activates VEGFA, highlighting profound cell-type specificity of its transcriptional outputs.","evidence":"ChIP-on-chip in breast cancer cells, in vivo mammary tumor regression, ChIP on VEGFA promoter in ARPE-19 cells","pmids":["24126059","23383089"],"confidence":"High","gaps":["Mechanism determining activator versus repressor function at different loci not resolved","Cofactors distinguishing pro- versus anti-angiogenic programs not identified"]},{"year":2014,"claim":"Identifying TGF-β as an activator of CREB3L1 RIP (via TM4SF20 suppression) and Smad4 as a nuclear co-activator partner connected CREB3L1 to a major fibrotic signaling axis and explained sustained collagen synthesis beyond canonical Smad-mediated transcription.","evidence":"TGF-β treatment, TM4SF20 knockdown/overexpression, Co-IP of CREB3L1-N with Smad4, reporter assays","pmids":["25310401"],"confidence":"High","gaps":["How TM4SF20 mechanistically inhibits CREB3L1 RIP not elucidated","Whether Smad4 interaction is direct or bridged not resolved structurally"]},{"year":2015,"claim":"Physical interaction of CREB3L1 with HIF-1α through the bZIP domain and cooperative activation of HRE-driven genes including VEGFA in bone revealed that CREB3L1 integrates ER stress and hypoxia signaling to regulate vascularization.","evidence":"Co-immunoprecipitation, HRE-luciferase reporter, OASIS−/− mouse metatarsal angiogenesis assay","pmids":["26558437"],"confidence":"High","gaps":["Structural basis of CREB3L1–HIF-1α interaction unknown","Whether this interaction occurs genome-wide or only at select loci not determined"]},{"year":2017,"claim":"Human genetics linked CREB3L1 loss-of-function mutations to osteogenesis imperfecta, with the pathogenic mechanism traced to failure of CREB3L1 to activate COPII components SEC23A and SEC24D, connecting transcriptional control of secretory pathway genes to collagen export and bone disease.","evidence":"Exome sequencing in consanguineous OI family, luciferase assay of bZIP-domain mutant, SEC24D protein reduction","pmids":["28817112","30657919"],"confidence":"Medium","gaps":["Limited number of OI families reported","Whether SEC23A/SEC24D reduction fully explains the OI phenotype versus additional CREB3L1 targets not tested","No animal model recapitulating the specific human mutation"]},{"year":2017,"claim":"Placing CREB3L1 downstream of PERK in mesenchymal triple-negative breast cancer as a pro-metastatic effector showed that CREB3L1's role in cancer is context-dependent—tumor-suppressive in some settings but pro-invasive when activated by the PERK–UPR axis.","evidence":"PERK inhibitor and CREB3L1 knockdown/overexpression, invasion assays, in vivo metastasis models","pmids":["29057869"],"confidence":"High","gaps":["How PERK activates CREB3L1 (direct phosphorylation, transcriptional, or RIP-mediated) not resolved","Determinants of tumor-suppressive versus pro-metastatic CREB3L1 function not identified"]},{"year":2021,"claim":"Discovery that full-length (uncleaved) CREB3L1 accumulates at damaged nuclear envelope sites and suppresses DNA damage revealed a RIP-independent structural role at the nuclear envelope, expanding CREB3L1 function beyond transcription.","evidence":"Live imaging, co-localization with LINC complex and NE repair factors (BAF, ESCRT-III), DNA damage assays under NE stress","pmids":["34226518"],"confidence":"Medium","gaps":["Mechanism by which full-length CREB3L1 is recruited to NE damage sites unknown","Whether NE function is independent of or coordinated with ER stress sensing not established","Single study without independent replication"]},{"year":2023,"claim":"Establishing that CREB3L1 arrests astrocytes and osteoblasts at G2/M via p53-independent p21 induction after DNA damage, and that epigenomic reactivation of silenced CREB3L1 suppresses glioblastoma, unified the tumor-suppressive and differentiation functions under a common cell-cycle control mechanism.","evidence":"OASIS−/− mice with brain injury, ChIP for p21 promoter, flow cytometry, epigenomic CREB3L1 promoter demethylation in glioblastoma xenografts","pmids":["37178686"],"confidence":"High","gaps":["Mechanism of p53-independent p21 activation by CREB3L1 at the chromatin level not defined","Whether G2/M arrest is universal across all CREB3L1-expressing cell types not tested"]},{"year":null,"claim":"Key unresolved questions include: (1) the structural basis for CREB3L1's cell-type-specific target gene selection; (2) the mechanism by which CREB3L1 translocates from ER to Golgi for S1P/S2P cleavage in the absence of a canonical Golgi localization signal; (3) how full-length CREB3L1 functions at damaged nuclear envelopes independently of RIP; and (4) the determinants that switch CREB3L1 between tumor-suppressive and pro-metastatic roles in different cancer contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of CREB3L1 or its complexes with Smad4/HIF-1α","ER-to-Golgi transport mechanism unresolved","Nuclear envelope function independently replicated only once","Context-dependent oncogene versus tumor suppressor switch not mechanistically explained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,3,7,10,15,20,21,31,34]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,6,7,20,27]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,3,5,13]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,10,15,33,34]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5,29]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[32]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[3,5,13,25]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,7,10,20,21,31,34]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,9,12,14]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[7,8,21,35]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10,15,34]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[13,27,28]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[27,28,29]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[21,23,26]}],"complexes":[],"partners":["SMAD4","HIF1A","HRD1","KPNA2","TM4SF20","SUN2","NESPRIN2"],"other_free_text":[]},"mechanistic_narrative":"CREB3L1 (OASIS) is an ER-resident, membrane-bound bZIP transcription factor that couples diverse extracellular signals to cell-type-specific transcriptional programs governing secretory capacity, differentiation, cell-cycle control, and extracellular matrix production. Under basal conditions, CREB3L1 is held in check by HRD1-mediated ubiquitin–proteasome degradation; ER stress, ceramide, BMP2, TGF-β, or viral infection triggers its regulated intramembrane proteolysis by Golgi-resident S1P/S2P, releasing an N-terminal fragment that translocates to the nucleus (facilitated by KPNA2) and activates target genes including Col1a1, p21, VEGFA, SEC23A, SEC24D, Pcsk1, and C6ST1, often in cooperation with Smad4 or HIF-1α [PMID:15665855, PMID:16417584, PMID:22705851, PMID:25310401, PMID:26558437, PMID:36192735]. CREB3L1 knockout mice exhibit severe osteopenia from deficient type I collagen, impaired astrocyte and goblet cell differentiation, and prolonged gliosis after brain injury, while CREB3L1 also arrests the cell cycle at G2/M via p53-independent p21 induction after DNA damage or viral infection [PMID:19767743, PMID:22262831, PMID:21767813, PMID:37178686]. Loss-of-function mutations in the bZIP domain cause osteogenesis imperfecta through failure to activate COPII component genes SEC23A and SEC24D [PMID:28817112, PMID:30657919]."},"prefetch_data":{"uniprot":{"accession":"Q96BA8","full_name":"Cyclic AMP-responsive element-binding protein 3-like protein 1","aliases":["Old astrocyte specifically-induced substance","OASIS"],"length_aa":519,"mass_kda":57.0,"function":"Precursor of the transcription factor form (Processed cyclic AMP-responsive element-binding protein 3-like protein 1), which is embedded in the endoplasmic reticulum membrane with N-terminal DNA-binding and transcription activation domains oriented toward the cytosolic face of the membrane (PubMed:12054625, PubMed:16417584, PubMed:25310401). In response to ER stress or DNA damage, transported to the Golgi, where it is cleaved in a site-specific manner by resident proteases S1P/MBTPS1 and S2P/MBTPS2. The released N-terminal cytosolic domain is translocated to the nucleus where it activates transcription of specific target genes involved in the cell-cycle progression inhibition (PubMed:12054625, PubMed:21767813, PubMed:25310401) Transcription factor involved in cell type specific DNA damage and unfolded protein response (UPR). Binds the DNA consensus sequence 5'-GTGXGCXGC-3' (PubMed:21767813). Plays a critical role in bone formation through the transcription of COL1A1, and possibly COL1A2, and the secretion of bone matrix proteins. Directly binds to the UPR element (UPRE)-like sequence in an osteoblast-specific COL1A1 promoter region and induces its transcription. Does not regulate COL1A1 in other tissues, such as skin (By similarity). Required to protect astrocytes from ER stress-induced cell death. In astrocytes, binds to the cAMP response element (CRE) of the BiP/HSPA5 promoter and participate in its transcriptional activation (By similarity). In astrocytes and osteoblasts, upon DNA damage, inhibits cell-cycle progression after G2/M phase by binding to promoters and activating transcription of genes encoding cell-cycle inhibitors, such as p21/CDKN1A (By similarity). Required for TGFB1 to activate genes involved in the assembly of collagen extracellular matrix (PubMed:25310401) (Microbial infection) May play a role in limiting virus spread by inhibiting proliferation of virus-infected cells. Upon infection with diverse DNA and RNA viruses, inhibits cell-cycle progression by binding to promoters and activating transcription of genes encoding cell-cycle inhibitors, such as p21/CDKN1A (PubMed:21767813)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96BA8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CREB3L1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CREB3L1","total_profiled":1310},"omim":[{"mim_id":"616229","title":"OSTEOGENESIS IMPERFECTA, TYPE XVI; OI16","url":"https://www.omim.org/entry/616229"},{"mim_id":"616215","title":"cAMP RESPONSE ELEMENT-BINDING PROTEIN 3-LIKE 1; CREB3L1","url":"https://www.omim.org/entry/616215"},{"mim_id":"300294","title":"MEMBRANE-BOUND TRANSCRIPTION FACTOR PROTEASE, SITE 2; MBTPS2","url":"https://www.omim.org/entry/300294"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"pancreas","ntpm":126.4},{"tissue":"salivary gland","ntpm":79.8}],"url":"https://www.proteinatlas.org/search/CREB3L1"},"hgnc":{"alias_symbol":["OASIS"],"prev_symbol":[]},"alphafold":{"accession":"Q96BA8","domains":[{"cath_id":"1.20.5","chopping":"265-361","consensus_level":"medium","plddt":85.9779,"start":265,"end":361}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96BA8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96BA8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96BA8-F1-predicted_aligned_error_v6.png","plddt_mean":55.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CREB3L1","jax_strain_url":"https://www.jax.org/strain/search?query=CREB3L1"},"sequence":{"accession":"Q96BA8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96BA8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96BA8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96BA8"}},"corpus_meta":[{"pmid":"19767743","id":"PMC_19767743","title":"Signalling mediated by the endoplasmic reticulum stress transducer OASIS is involved in bone formation.","date":"2009","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19767743","citation_count":293,"is_preprint":false},{"pmid":"15665855","id":"PMC_15665855","title":"OASIS, a CREB/ATF-family member, modulates UPR signalling in astrocytes.","date":"2005","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15665855","citation_count":247,"is_preprint":false},{"pmid":"24812292","id":"PMC_24812292","title":"Higher disease activity leads to more structural damage in the spine in ankylosing spondylitis: 12-year longitudinal data from the OASIS cohort.","date":"2014","source":"Annals of the rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/24812292","citation_count":243,"is_preprint":false},{"pmid":"15640831","id":"PMC_15640831","title":"Clinicopathologic and molecular genetic characterization of low-grade fibromyxoid sarcoma, and cloning of a novel FUS/CREB3L1 fusion gene.","date":"2005","source":"Laboratory investigation; 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Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — initial identification by expression; foundational characterization paper\",\n      \"pmids\": [\"10350641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"OASIS/CREB3L1 is a transcriptional activator that activates transcription through box-B elements (but not somatostatin CRE); its C-terminal transmembrane domain anchors it to the ER and represses transcriptional activity, while truncation of the transmembrane domain relocates it to the nucleus and markedly increases transcriptional activity.\",\n      \"method\": \"Luciferase reporter assays, western blot, subcellular localization by transfection and deletion constructs\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional domain dissection with reporter assays and localization\",\n      \"pmids\": [\"12054625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"OASIS/CREB3L1 binds CRE sequences (shown by gel shift assay), has a strong N-terminal transcriptional activation domain rich in acidic amino acids, and contains a C-terminal repression domain not previously described in CREB/ATF members.\",\n      \"method\": \"Gel shift assay, GAL4-UAS-luciferase reporter assay, deletion construct analysis in COS7 cells\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical binding and functional domain mapping\",\n      \"pmids\": [\"12480185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"OASIS/CREB3L1 is an ER stress transducer: it is a membrane-bound bZIP transcription factor that is cleaved at the membrane in response to ER stress (regulated intramembrane proteolysis), and the released N-terminal cytoplasmic domain translocates to the nucleus where it activates transcription of target genes via ER stress-responsive and cAMP-responsive elements. Overexpression induced BiP and suppressed ER-stress-induced cell death; knockdown reduced BiP and increased susceptibility to ER stress in astrocytes.\",\n      \"method\": \"Knockdown and overexpression in astrocytes, reporter assays, western blot, nuclear fractionation, BiP induction assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a high-impact study; foundational mechanism paper\",\n      \"pmids\": [\"15665855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A novel FUS/CREB3L1 fusion gene was identified in a case of low-grade fibromyxoid sarcoma (LGFMS), where the N-terminal domain of FUS is fused in-frame to CREB3L1 (analogous to the more common FUS/CREB3L2 fusion), establishing CREB3L1 rearrangement as an alternative oncogenic driver in LGFMS.\",\n      \"method\": \"RT-PCR, sequencing, histopathologic analysis across multiple centers\",\n      \"journal\": \"Laboratory investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — molecular identification confirmed by sequencing, replicated across multiple tumor centers\",\n      \"pmids\": [\"15640831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"OASIS/CREB3L1 is processed by Site-1 Protease (S1P) and Site-2 Protease (S2P) — the same Golgi-resident proteases that cleave ATF6 — in response to ER stress, and its cleavage requires translocation to the Golgi apparatus. Unlike ATF6, OASIS does not have a significant luminal Golgi localization signal, suggesting alternative mechanisms for its Golgi translocation.\",\n      \"method\": \"Protease inhibitor studies, S1P/S2P mutant cell lines, deletion mutant analysis, subcellular fractionation\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mechanistic identification of the proteases responsible for OASIS cleavage with mutant cell lines\",\n      \"pmids\": [\"16417584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"OASIS/CREB3L1 directly binds a CRE site in the GCMa/Gcm1 promoter and stimulates GCMa transcription in trophoblast cells; knockdown of OASIS in BeWo cells decreased endogenous GCMa mRNA. Overexpression of OASIS in choriocarcinoma cells led to placental cell fusion.\",\n      \"method\": \"Promoter mapping, reporter assays, siRNA knockdown, gel shift/ChIP, overexpression in trophoblast cell lines\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter binding and functional knockdown with multiple readouts\",\n      \"pmids\": [\"18495750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"OASIS/CREB3L1 is required for bone formation: it activates transcription of Col1a1 (type I collagen) through a UPRE-like sequence in the osteoblast-specific Col1a1 promoter. OASIS-/- mice show severe osteopenia with decreased type I collagen in the bone matrix and dilated rough ER in osteoblasts. BMP2 induces OASIS expression and accelerates its regulated intramembrane proteolysis.\",\n      \"method\": \"OASIS-/- mouse model, ChIP, reporter assay, histological analysis, BMP2 stimulation experiments\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — combined in vivo knockout, ChIP, reporter assays, and defined cellular phenotype in high-impact journal\",\n      \"pmids\": [\"19767743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In pancreatic beta-cells, active nuclear OASIS/CREB3L1 upregulates genes involved in extracellular matrix production and protein transport (but not classical UPR genes like BiP/GRP78), demonstrating that the repertoire of OASIS target genes is cell-type dependent. Endogenous OASIS is regulated post-transcriptionally by miR-140 in beta-cells.\",\n      \"method\": \"Microarray after inducible nuclear OASIS expression in INS-1 cells, reporter assay, miRNA analysis\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide target identification with functional reporter follow-up\",\n      \"pmids\": [\"20668028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Osteoblast-specific re-expression of OASIS in OASIS-/- mice rescues osteopenia and normalizes type I collagen mRNA levels and rough ER morphology, but does not rescue growth retardation, which is attributed to reduced serum GH and IGF-1 levels — demonstrating distinct osteoblast-dependent and -independent skeletal mechanisms.\",\n      \"method\": \"Transgenic rescue experiment (osteoblast-specific Col1a1 promoter), histology, RT-PCR, ELISA for GH/IGF-1\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue epistasis with multiple orthogonal readouts\",\n      \"pmids\": [\"21047569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CREB3L1/OASIS is proteolytically cleaved upon infection with diverse DNA and RNA viruses (murine γ-herpesvirus 68, HCV, West Nile virus, Sendai virus), allowing its N-terminus to enter the nucleus and induce cell-cycle inhibitors (including p21) to block proliferation of virus-infected cells. CREB3L1 expression is silenced in proliferating cells harboring HCV or WNV replicons.\",\n      \"method\": \"Viral infection models, western blot for CREB3L1 cleavage, gene expression analysis, knockdown/overexpression, proliferation assays\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple virus systems, mechanistic pathway established with KD and overexpression\",\n      \"pmids\": [\"21767813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EWSR1-CREB3L1 fusion transcript was identified in small cell osteosarcoma; the chimeric protein (~70 kDa) shows nuclear localization (confirmed by immunohistochemistry) rather than the normal perinuclear localization of wild-type CREB3L1, consistent with function as a constitutively active nuclear transcriptional regulator.\",\n      \"method\": \"RACE, RT-PCR, sequencing, genomic breakpoint confirmation, immunohistochemistry, western blot\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — molecular characterization with protein-level confirmation and localization\",\n      \"pmids\": [\"21987447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OASIS/CREB3L1 promotes terminal differentiation of goblet cells in the large intestine: OASIS-/- mice show reduced goblet cell numbers, decreased mucus production, abnormal mucous vesicle and rough ER morphology, decreased mature goblet cell markers, and increased early goblet cell markers. OASIS is activated by mild ER stress during goblet cell differentiation.\",\n      \"method\": \"OASIS-/- mouse model, morphological analysis, in vitro knockdown in goblet cell culture model, marker expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout with defined cellular phenotype and in vitro mechanistic validation\",\n      \"pmids\": [\"22262831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HRD1, an ER-resident E3 ubiquitin ligase, ubiquitinates and destabilizes OASIS/CREB3L1 under normal conditions via the ubiquitin-proteasome pathway. ER stress dissociates the HRD1-OASIS interaction, stabilizing OASIS and enabling its transcriptional activity. Stabilization of OASIS in Hrd1-/- cells enhances collagen fiber production during osteoblast differentiation.\",\n      \"method\": \"Co-immunoprecipitation, HRD1 knockout cells, ubiquitination assay, proteasome inhibitor studies, collagen production assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct biochemical identification of E3 ligase, reciprocal Co-IP, genetic validation in Hrd1-/- cells\",\n      \"pmids\": [\"22705851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OASIS/CREB3L1 is required for astrocyte differentiation from neural precursor cells: OASIS-/- mouse cortices contain fewer astrocytes and more neural precursor cells during embryonic development. OASIS directly induces Gcm1 transcription (a target required for astrocyte differentiation in Drosophila), and Gcm1 introduction into OASIS-/- NPCs rescues differentiation by accelerating Gfap promoter demethylation.\",\n      \"method\": \"OASIS-/- mouse model, primary NPC culture, Gcm1 rescue experiment, GFAP promoter methylation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout, genetic rescue, and epigenetic mechanism identification\",\n      \"pmids\": [\"22828627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Doxorubicin stimulates de novo ceramide synthesis, which activates CREB3L1 by stimulating its proteolytic cleavage by Site-1 Protease and Site-2 Protease. The released N-terminal domain enters the nucleus and activates transcription of cell-cycle inhibitors including p21. Knockdown of CREB3L1 confers doxorubicin resistance; overexpression enhances sensitivity.\",\n      \"method\": \"Ceramide synthesis inhibitors, S1P/S2P inhibitor studies, siRNA knockdown, overexpression, cell proliferation assays, nuclear fractionation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mechanistic pathway with pharmacological and genetic intervention, multiple cell lines\",\n      \"pmids\": [\"23256041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EWSR1-CREB3L1 fusion transcripts were identified as the predominant genetic event in pure sclerosing epithelioid fibrosarcoma (SEF) by RT-PCR and mRNA sequencing, distinct from FUS-CREB3L2 fusions in LGFMS, supporting these as different tumor types with different molecular drivers.\",\n      \"method\": \"FISH, RT-PCR, mRNA sequencing in 10 primary SEF tumors\",\n      \"journal\": \"The American journal of surgical pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — molecular characterization by multiple methods in a series of tumors\",\n      \"pmids\": [\"24441665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CREB3L1 suppresses metastasis in breast cancer: reintroduction of CREB3L1 into metastatic cells reduced invasion and migration in vitro, and in vivo led to regression of primary tumors in 70% of animals via impaired angiogenesis. ChIP-on-chip identified direct CREB3L1 target genes, including genes involved in angiogenesis that are repressed by CREB3L1.\",\n      \"method\": \"Transfection of metastatic cells, in vitro invasion/migration assays, in vivo rat mammary tumor model, microarray, ChIP-on-chip\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — combined in vitro and in vivo models with genome-wide ChIP target identification\",\n      \"pmids\": [\"24126059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In human glioma cell lines, OASIS/CREB3L1 knockdown attenuates the UPR (reduced BiP/GRP78 and GRP94 induction), decreases chondroitin sulfate proteoglycan extracellular matrix proteins, and reduces cell migration. OASIS protein in glioma cells is N-glycosylated at Asn-513.\",\n      \"method\": \"siRNA knockdown, western blot, ER stress induction, migration assays, glycosylation analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockdown with multiple defined phenotypic readouts\",\n      \"pmids\": [\"23335989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EWSR1-CREB3L1 fusion was found as an alternative molecular aberration in LGFMS, confirmed by DNA sequencing of RT-PCR products and FISH, expanding the genetic spectrum of LGFMS.\",\n      \"method\": \"RT-PCR, DNA sequencing, FISH\",\n      \"journal\": \"The American journal of surgical pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — molecular confirmation by multiple methods\",\n      \"pmids\": [\"23588368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CREB3L1 regulates VEGFA transcription in human retinal pigment epithelial cells (ARPE-19): OASIS directly binds a CRE-like site at ~-500 bp of the VEGFA promoter (confirmed by ChIP), and is the most effective UPR transcription factor driving VEGFA promoter activity after ER stress in these cells.\",\n      \"method\": \"Reporter assays with VEGFA promoter deletion/mutation constructs, ChIP, ER stress induction, comparison of ATF6/XBP1/ATF4/OASIS\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirms direct binding; reporter dissection identifies binding site\",\n      \"pmids\": [\"23383089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TGF-β induces proteolytic activation of CREB3L1 through inhibition of TM4SF20 (which normally inhibits RIP of CREB3L1). The released N-terminal domain enters the nucleus and binds Smad4 to activate transcription of genes encoding collagen assembly extracellular matrix proteins, providing a mechanism for sustained TGF-β-induced collagen synthesis.\",\n      \"method\": \"TGF-β treatment of A549 cells, TM4SF20 knockdown/overexpression, Co-IP of CREB3L1 N-terminal domain with Smad4, reporter assay, western blot for RIP\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — identified regulatory factor (TM4SF20), binding partner (Smad4), and downstream targets with Co-IP and functional assays\",\n      \"pmids\": [\"25310401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"OASIS/CREB3L1 is epigenetically silenced by promoter hypermethylation in bladder cancer, and re-expression suppresses tumor cell migration and colony growth. HTRA3 was identified as a putative target gene of CREB3L1 in invasive bladder cancer cells.\",\n      \"method\": \"Pyrosequencing of CpG methylation, siRNA re-expression, migration assay, colony assay, target gene identification\",\n      \"journal\": \"Epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epigenetic mechanism with functional rescue and target gene identification\",\n      \"pmids\": [\"25625847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"OASIS/CREB3L1 modulates the hypoxia signaling pathway by physically interacting with HIF-1α through its bZIP domain (shown by co-immunoprecipitation), and the OASIS-N fragment promotes transcription of HIF-1α target genes (including VEGFA) via hypoxia-response elements. OASIS-deficient mice show decreased VEGFA expression and retarded vascularization in bone tissue.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay with HRE, RT-PCR, immunostaining, metatarsal angiogenesis assay in OASIS-/- mice\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP identifies direct interaction, combined with in vivo phenotype and reporter validation\",\n      \"pmids\": [\"26558437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CREB3L1 is a transcriptional regulator of the arginine vasopressin (AVP) gene in rat hypothalamus; cAMP (via forskolin) upregulates Creb3l1 mRNA and protein and increases Avp promoter activity, an effect blunted by Creb3l1 shRNA. Glucocorticoids (dexamethasone) negatively regulate Creb3l1 expression, thereby reducing AVP induction.\",\n      \"method\": \"shRNA knockdown of Creb3l1 in AtT20 cells and hypothalamic organotypic cultures, AVP promoter reporter assay, in vivo dexamethasone injection\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gene silencing with multiple in vitro and in vivo readouts\",\n      \"pmids\": [\"26503226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In the osmotically challenged rat hypothalamus, CREB3L1 acts as a transcriptional mediator of the ER stress response: dominant-negative CREB3L1 introduced into the SON by lentiviral vector decreased Chop and unspliced Xbp1 mRNA levels, but not BiP or Atf4.\",\n      \"method\": \"Lentiviral delivery of dominant-negative CREB3L1 into rat SON, RT-PCR for ER stress markers\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo dominant-negative with specific transcriptional readouts\",\n      \"pmids\": [\"25915053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CREB3L1 acts downstream of PERK kinase specifically in mesenchymal subtype triple-negative breast cancer to mediate pro-metastatic functions: genetic or pharmacological inhibition of CREB3L1 suppresses cancer cell invasion and metastasis, placing CREB3L1 as a key effector of PERK-driven invasion.\",\n      \"method\": \"PERK inhibitor treatment, CREB3L1 knockdown/overexpression, invasion assays, in vivo metastasis models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis (PERK→CREB3L1), multiple loss-of-function approaches, in vivo validation\",\n      \"pmids\": [\"29057869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A pathogenic missense variant p.(Ala304Val) in the bZIP domain of CREB3L1 reduces its DNA-binding ability (shown by luciferase assay) and decreases transcription of SEC23A and SEC24D (COPII components), and reduces SEC24D protein levels, demonstrating a functional link between OASIS and the COPII secretory complex in OI pathogenesis.\",\n      \"method\": \"In vitro structural modeling, luciferase transcriptional activity assay, overexpression of mutant OASIS, western blot for SEC24D\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional characterization of missense variant with reporter and target protein analysis\",\n      \"pmids\": [\"30657919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CREB3L1 (OASIS) disruption of a DNA-binding site in the bZIP domain prevents activation of SEC24D transcription in human OI; in a consanguineous family with a CREB3L1 variant causing OI, OASIS fails to act on transcriptional targets including SEC24D (a COPII coat component), linking defective OASIS signaling to impaired secretory pathway function.\",\n      \"method\": \"Exome sequencing, functional validation by reporter assay, identification of SEC24D as target\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic and functional evidence linking CREB3L1 to COPII component regulation\",\n      \"pmids\": [\"28817112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CREB3L1 regulates secretory pathway capacity in thyroid cells: TSH stimulation upregulates CREB3L1, which increases expression of ER-Golgi transport factors and causes Golgi complex expansion; dominant-negative CREB3L1 impairs TSH-induced Golgi expansion, establishing CREB3L1 as a downstream effector coupling cargo load to secretory pathway capacity.\",\n      \"method\": \"TSH stimulation of thyroid cells, dominant-negative CREB3L1 construct, Golgi volume quantification, transport factor mRNA analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dominant-negative epistasis with organelle morphology and molecular readouts\",\n      \"pmids\": [\"29093023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Orphan nuclear receptor Nr4a1 directly activates Creb3l1 transcription by binding a single NBRE site in the Creb3l1 promoter, as a downstream effector of cAMP signaling; shRNA silencing of Nr4a1 in AtT20 cells prevents cAMP-induced Creb3l1 upregulation. CpG methylation of the Creb3l1 proximal promoter determines accessibility of this pathway.\",\n      \"method\": \"shRNA silencing of Nr4a1, promoter reporter assay with NBRE site mutations, microarray mining, bisulfite methylation analysis\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding identified, genetic validation by shRNA\",\n      \"pmids\": [\"29311806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CREB3L1 directly regulates transcription of Pcsk1 (encoding prohormone convertase PC1/3) by binding a G-box motif in the Pcsk1 promoter in endocrine cells; overexpression of Creb3l1 in the supraoptic nucleus increases Pcsk1, while knockdown decreases it, establishing CREB3L1 as a regulator of the neuropeptide processing enzyme supply chain.\",\n      \"method\": \"RNA-seq after Creb3l1 knockdown in AtT20 cells, in vitro promoter activity assay, direct binding studies, viral overexpression/knockdown in rat supraoptic nucleus\",\n      \"journal\": \"Journal of neuroendocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding, in vitro and in vivo validation\",\n      \"pmids\": [\"32319174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"OASIS/CREB3L1 accumulates as a full-length form (not cleaved) at sites of damaged nuclear envelope (NE) where lamins are depleted, colocalizes with LINC complex components SUN2 and Nesprin-2, and with NE repair factors (BAF, LEM domain proteins, ESCRT-III component). OASIS suppresses DNA damage and restores nuclear shape under NE stress, revealing a novel NE stress response function distinct from its ER stress/RIP function.\",\n      \"method\": \"Live imaging, immunofluorescence, co-localization with NE repair factors, DNA damage assays, nuclear deformation assays under NE stress\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments with functional consequence (DNA damage suppression)\",\n      \"pmids\": [\"34226518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In anaplastic thyroid carcinoma (ATC), CREB3L1 promotes invasion and metastasis by activating ECM signaling (collagen subtypes), and mediates activation of α-SMA-positive cancer-associated fibroblasts (CAFs) through IL-1α production; KPNA2 mediates nuclear translocation of CREB3L1, linking it to downstream ECM gene activation.\",\n      \"method\": \"CREB3L1 knockdown/overexpression in ATC cells, zebrafish and nude mouse xenograft models, cytokine array screening, single-cell RNA-seq, CAF co-culture assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo models with defined mechanism (KPNA2-mediated nuclear import, IL-1α-CAF axis)\",\n      \"pmids\": [\"36192735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"OASIS/CREB3L1 arrests the cell cycle at G2/M phase after DNA damage by directly inducing p21 transcription, independent of p53. This cell-cycle arrest function is dominant in astrocytes and osteoblasts. In a brain injury model, OASIS-/- reactive astrocytes show sustained proliferation and prolonged gliosis. Epigenomic removal of CREB3L1 promoter hypermethylation in glioblastoma xenografts suppresses tumorigenesis.\",\n      \"method\": \"OASIS-/- mice, DNA damage assays, flow cytometry for cell cycle, ChIP for p21 promoter, brain injury model, epigenomic engineering in glioblastoma xenografts\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, in vivo models, direct ChIP evidence for p21 as target\",\n      \"pmids\": [\"37178686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"C5a-C5aR1 activates ER stress via the PERK-eIF2α-ATF4 pathway, with CREB3L1 acting as a key downstream mediator that promotes vascular smooth muscle cell osteogenic transdifferentiation and vascular calcification by inducing COL1α1 expression.\",\n      \"method\": \"VSMC calcification model, C5aR1 antagonist (PMX53), in vivo chronic kidney disease mouse model, pathway inhibition studies, calcium deposition/osteogenic marker assays\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological epistasis placing CREB3L1 downstream of PERK-eIF2α-ATF4 in vascular calcification\",\n      \"pmids\": [\"37603848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"OASIS/CREB3L1 regulates chondroitin 6-O-sulfotransferase 1 (C6ST1) gene transcription in reactive astrocytes: OASIS knockout mice show attenuated CS-C immunoreactivity after brain stab injury, C6ST1 mRNA/protein induction is lost in OASIS-/- injured cortices, and a C-terminal deletion OASIS mutant directly activates C6ST1 transcription through the first intron region, promoting CSPG sulfation and creating a non-permissive environment for axonal regeneration.\",\n      \"method\": \"OASIS-/- mouse brain stab injury model, RT-PCR, immunostaining, C6ST1 reporter driven by intron 1, neurite outgrowth assays on membrane fractions\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout, direct transcriptional activation of C6ST1 by deletion construct, functional neurite outgrowth readout\",\n      \"pmids\": [\"24716865\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CREB3L1 (OASIS) is an ER-resident, membrane-bound bZIP transcription factor that, upon stimuli including ER stress, virus infection, doxorubicin/ceramide, TGF-β, or BMP2, undergoes regulated intramembrane proteolysis by Golgi-resident S1P and S2P proteases (normally held in check by HRD1-mediated ubiquitin-proteasome degradation); the released N-terminal domain translocates to the nucleus — a process facilitated by KPNA2 — where it activates cell-type-specific target genes including Col1a1, p21, VEGFA, C6ST1, Pcsk1, and ECM/COPII components (SEC23A, SEC24D), coordinates with Smad4, HIF-1α, and OASIS family members, and mediates diverse physiological processes including bone formation, astrocyte/goblet cell differentiation, antiviral proliferation arrest, metastasis suppression, and Golgi expansion for secretory capacity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CREB3L1 (OASIS) is an ER-resident, membrane-bound bZIP transcription factor that couples diverse extracellular signals to cell-type-specific transcriptional programs governing secretory capacity, differentiation, cell-cycle control, and extracellular matrix production. Under basal conditions, CREB3L1 is held in check by HRD1-mediated ubiquitin–proteasome degradation; ER stress, ceramide, BMP2, TGF-β, or viral infection triggers its regulated intramembrane proteolysis by Golgi-resident S1P/S2P, releasing an N-terminal fragment that translocates to the nucleus (facilitated by KPNA2) and activates target genes including Col1a1, p21, VEGFA, SEC23A, SEC24D, Pcsk1, and C6ST1, often in cooperation with Smad4 or HIF-1α [PMID:15665855, PMID:16417584, PMID:22705851, PMID:25310401, PMID:26558437, PMID:36192735]. CREB3L1 knockout mice exhibit severe osteopenia from deficient type I collagen, impaired astrocyte and goblet cell differentiation, and prolonged gliosis after brain injury, while CREB3L1 also arrests the cell cycle at G2/M via p53-independent p21 induction after DNA damage or viral infection [PMID:19767743, PMID:22262831, PMID:21767813, PMID:37178686]. Loss-of-function mutations in the bZIP domain cause osteogenesis imperfecta through failure to activate COPII component genes SEC23A and SEC24D [PMID:28817112, PMID:30657919].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying CREB3L1 as a new CREB/ATF family member expressed in astrocytes established its tissue context and set the stage for functional dissection of a previously unknown ER-associated transcription factor.\",\n      \"evidence\": \"Differential display screening and in situ hybridization in mouse CNS after cryo-injury\",\n      \"pmids\": [\"10350641\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No function assigned beyond expression pattern\", \"Protein product not characterized biochemically\", \"No target genes identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Domain dissection revealed that CREB3L1 is an ER-anchored transcription factor whose C-terminal transmembrane domain restricts it from the nucleus, establishing the principle that proteolytic release would be required for transcriptional activation.\",\n      \"evidence\": \"Deletion constructs, reporter assays, and subcellular localization in transfected cells\",\n      \"pmids\": [\"12054625\", \"12480185\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease(s) responsible for cleavage not identified\", \"Physiological triggers for activation unknown\", \"Endogenous target genes not determined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that ER stress triggers regulated intramembrane proteolysis of CREB3L1 to release a nuclear-translocating N-terminal fragment that induces BiP and protects astrocytes from ER-stress-induced death established CREB3L1 as a bona fide ER stress transducer, paralleling ATF6.\",\n      \"evidence\": \"Knockdown and overexpression in astrocytes, nuclear fractionation, BiP induction, and cell death assays\",\n      \"pmids\": [\"15665855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the cleaving proteases not yet confirmed\", \"Spectrum of target genes beyond BiP unknown\", \"In vivo physiological relevance not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying S1P and S2P as the Golgi-resident proteases responsible for CREB3L1 cleavage resolved the enzymatic basis of its activation and placed it within the same RIP pathway as ATF6 and SREBP.\",\n      \"evidence\": \"S1P/S2P mutant cell lines, protease inhibitors, and deletion mutant analysis\",\n      \"pmids\": [\"16417584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CREB3L1 translocation from ER to Golgi unclear (no canonical Golgi localization signal)\", \"Regulation of S1P/S2P access to CREB3L1 not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The OASIS knockout mouse revealed that CREB3L1 is essential for bone formation by directly activating Col1a1 transcription in osteoblasts, providing the first in vivo loss-of-function phenotype and identifying a key target gene.\",\n      \"evidence\": \"OASIS−/− mouse with severe osteopenia, ChIP on Col1a1 promoter, BMP2 stimulation experiments\",\n      \"pmids\": [\"19767743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the osteopenia phenotype is solely Col1a1-dependent or involves additional targets not resolved\", \"Mechanism linking BMP2 to OASIS RIP not elucidated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Osteoblast-specific rescue of OASIS−/− mice normalized bone collagen but not growth retardation, revealing that CREB3L1 has both cell-autonomous (osteoblast) and systemic (GH/IGF-1 axis) roles in skeletal physiology.\",\n      \"evidence\": \"Transgenic rescue under Col1a1 promoter, histology, serum GH/IGF-1 ELISA\",\n      \"pmids\": [\"21047569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue(s) responsible for the GH/IGF-1 deficiency not identified\", \"Direct versus indirect regulation of GH axis by CREB3L1 unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating that diverse viruses trigger CREB3L1 cleavage to induce p21 and block proliferation of infected cells established a novel antiviral function via cell-cycle arrest, independent of the classical UPR.\",\n      \"evidence\": \"Infection with γ-HV68, HCV, WNV, Sendai virus; CREB3L1 knockdown/overexpression; proliferation assays\",\n      \"pmids\": [\"21767813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Viral mechanism triggering CREB3L1 cleavage not defined\", \"Whether viruses actively silence CREB3L1 transcription or select for low-expressing cells unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Multiple studies converged to show that CREB3L1 drives cell-type-specific differentiation programs: goblet cell maturation in the intestine and astrocyte differentiation from neural precursors (via Gcm1 induction and GFAP promoter demethylation), while HRD1-mediated ubiquitination was identified as the basal degradation mechanism keeping CREB3L1 inactive.\",\n      \"evidence\": \"OASIS−/− mice (goblet cell and astrocyte phenotypes), Gcm1 rescue of NPC differentiation, Co-IP of HRD1-OASIS, ubiquitination assays in Hrd1−/− cells\",\n      \"pmids\": [\"22262831\", \"22828627\", \"22705851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ER stress dissociates HRD1-OASIS interaction mechanistically not defined\", \"Gcm1 as the sole mediator of astrocyte differentiation downstream of OASIS not confirmed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linking doxorubicin-induced ceramide synthesis to S1P/S2P-mediated CREB3L1 cleavage and p21-dependent growth arrest provided a mechanistic explanation for how this chemotherapeutic agent engages a non-canonical cell-cycle checkpoint.\",\n      \"evidence\": \"Ceramide synthesis and S1P/S2P inhibitors, siRNA knockdown, overexpression, proliferation assays\",\n      \"pmids\": [\"23256041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ceramide promotes CREB3L1 transit from ER to Golgi not determined\", \"Relevance in clinical doxorubicin resistance not tested in patient samples\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genome-wide target identification (ChIP-on-chip) in metastatic breast cancer showed that CREB3L1 directly represses angiogenesis-related genes and suppresses metastasis in vivo, while in retinal epithelial cells it directly activates VEGFA, highlighting profound cell-type specificity of its transcriptional outputs.\",\n      \"evidence\": \"ChIP-on-chip in breast cancer cells, in vivo mammary tumor regression, ChIP on VEGFA promoter in ARPE-19 cells\",\n      \"pmids\": [\"24126059\", \"23383089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism determining activator versus repressor function at different loci not resolved\", \"Cofactors distinguishing pro- versus anti-angiogenic programs not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying TGF-β as an activator of CREB3L1 RIP (via TM4SF20 suppression) and Smad4 as a nuclear co-activator partner connected CREB3L1 to a major fibrotic signaling axis and explained sustained collagen synthesis beyond canonical Smad-mediated transcription.\",\n      \"evidence\": \"TGF-β treatment, TM4SF20 knockdown/overexpression, Co-IP of CREB3L1-N with Smad4, reporter assays\",\n      \"pmids\": [\"25310401\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TM4SF20 mechanistically inhibits CREB3L1 RIP not elucidated\", \"Whether Smad4 interaction is direct or bridged not resolved structurally\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Physical interaction of CREB3L1 with HIF-1α through the bZIP domain and cooperative activation of HRE-driven genes including VEGFA in bone revealed that CREB3L1 integrates ER stress and hypoxia signaling to regulate vascularization.\",\n      \"evidence\": \"Co-immunoprecipitation, HRE-luciferase reporter, OASIS−/− mouse metatarsal angiogenesis assay\",\n      \"pmids\": [\"26558437\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CREB3L1–HIF-1α interaction unknown\", \"Whether this interaction occurs genome-wide or only at select loci not determined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Human genetics linked CREB3L1 loss-of-function mutations to osteogenesis imperfecta, with the pathogenic mechanism traced to failure of CREB3L1 to activate COPII components SEC23A and SEC24D, connecting transcriptional control of secretory pathway genes to collagen export and bone disease.\",\n      \"evidence\": \"Exome sequencing in consanguineous OI family, luciferase assay of bZIP-domain mutant, SEC24D protein reduction\",\n      \"pmids\": [\"28817112\", \"30657919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited number of OI families reported\", \"Whether SEC23A/SEC24D reduction fully explains the OI phenotype versus additional CREB3L1 targets not tested\", \"No animal model recapitulating the specific human mutation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placing CREB3L1 downstream of PERK in mesenchymal triple-negative breast cancer as a pro-metastatic effector showed that CREB3L1's role in cancer is context-dependent—tumor-suppressive in some settings but pro-invasive when activated by the PERK–UPR axis.\",\n      \"evidence\": \"PERK inhibitor and CREB3L1 knockdown/overexpression, invasion assays, in vivo metastasis models\",\n      \"pmids\": [\"29057869\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PERK activates CREB3L1 (direct phosphorylation, transcriptional, or RIP-mediated) not resolved\", \"Determinants of tumor-suppressive versus pro-metastatic CREB3L1 function not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that full-length (uncleaved) CREB3L1 accumulates at damaged nuclear envelope sites and suppresses DNA damage revealed a RIP-independent structural role at the nuclear envelope, expanding CREB3L1 function beyond transcription.\",\n      \"evidence\": \"Live imaging, co-localization with LINC complex and NE repair factors (BAF, ESCRT-III), DNA damage assays under NE stress\",\n      \"pmids\": [\"34226518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which full-length CREB3L1 is recruited to NE damage sites unknown\", \"Whether NE function is independent of or coordinated with ER stress sensing not established\", \"Single study without independent replication\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Establishing that CREB3L1 arrests astrocytes and osteoblasts at G2/M via p53-independent p21 induction after DNA damage, and that epigenomic reactivation of silenced CREB3L1 suppresses glioblastoma, unified the tumor-suppressive and differentiation functions under a common cell-cycle control mechanism.\",\n      \"evidence\": \"OASIS−/− mice with brain injury, ChIP for p21 promoter, flow cytometry, epigenomic CREB3L1 promoter demethylation in glioblastoma xenografts\",\n      \"pmids\": [\"37178686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of p53-independent p21 activation by CREB3L1 at the chromatin level not defined\", \"Whether G2/M arrest is universal across all CREB3L1-expressing cell types not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: (1) the structural basis for CREB3L1's cell-type-specific target gene selection; (2) the mechanism by which CREB3L1 translocates from ER to Golgi for S1P/S2P cleavage in the absence of a canonical Golgi localization signal; (3) how full-length CREB3L1 functions at damaged nuclear envelopes independently of RIP; and (4) the determinants that switch CREB3L1 between tumor-suppressive and pro-metastatic roles in different cancer contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of CREB3L1 or its complexes with Smad4/HIF-1α\", \"ER-to-Golgi transport mechanism unresolved\", \"Nuclear envelope function independently replicated only once\", \"Context-dependent oncogene versus tumor suppressor switch not mechanistically explained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 3, 7, 10, 15, 20, 21, 31, 34]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 6, 7, 20, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 3, 5, 13]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 10, 15, 33, 34]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5, 29]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [3, 5, 13, 25]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 7, 10, 20, 21, 31, 34]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 9, 12, 14]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [7, 8, 21, 35]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10, 15, 34]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [13, 27, 28]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [27, 28, 29]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [21, 23, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SMAD4\",\n      \"HIF1A\",\n      \"HRD1\",\n      \"KPNA2\",\n      \"TM4SF20\",\n      \"SUN2\",\n      \"NESPRIN2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}