{"gene":"CREB3L1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":1999,"finding":"OASIS/CREB3L1 was identified as a novel CREB/ATF family transcription factor with a transmembrane domain, specifically induced in long-term cultured astrocytes and gliotic tissue; its expression is developmentally regulated and induced by CNS injury.","method":"Differential display screening, in situ hybridization, expression analysis in mouse embryo and injured brain","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — initial identification with in situ hybridization and expression analysis, replicated in multiple tissues/conditions, no direct functional assay of the protein","pmids":["10350641"],"is_preprint":false},{"year":2002,"finding":"OASIS functions as a transcriptional activator through CRE binding; the transmembrane domain suppresses transcriptional activity and retains OASIS in the ER, while truncation of the transmembrane domain increases transcriptional activity and relocates OASIS to the nucleus.","method":"GAL4-UAS-luciferase reporter assay, gel shift assay, subcellular localization by Western blot, deletion constructs in COS7 cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay, gel shift, and localization experiments in a single study with multiple orthogonal methods","pmids":["12054625"],"is_preprint":false},{"year":2005,"finding":"OASIS/CREB3L1 is a membrane-bound ER-resident transcription factor that is cleaved at the membrane in response to ER stress, releasing its cytoplasmic bZIP-containing N-terminal domain to translocate to the nucleus where it activates target genes via ER stress-responsive and cAMP-responsive elements; knockdown reduced BiP levels and exacerbated ER stress in astrocytes, while overexpression induced BiP and suppressed ER-stress-induced cell death.","method":"Membrane cleavage assay, nuclear translocation imaging, reporter gene assay, knockdown (siRNA), overexpression in astrocytes","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (cleavage assay, localization, reporter, KD, OE) in a single rigorous study with defined phenotypic readouts","pmids":["15665855"],"is_preprint":false},{"year":2006,"finding":"OASIS/CREB3L1 is processed by Site-1 Protease (S1P) and Site-2 Protease (S2P) at the Golgi apparatus in response to ER stress, similar to ATF6; cleavage is triggered by translocation of OASIS from the ER to the Golgi, but unlike ATF6, luminal domain deletion mutants retain intact proteolytic processing, indicating OASIS lacks a canonical Golgi localization signal.","method":"Protease inhibitor assays, deletion mutagenesis, subcellular fractionation/localization in transfected cells","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic identification of S1P/S2P as the processing proteases with deletion mutagenesis and localization, replicated mechanistic detail","pmids":["16417584"],"is_preprint":false},{"year":2008,"finding":"OASIS/CREB3L1 binds and stimulates the promoter of the transcription factor GCMa/Gcm1 in trophoblast cells; knockdown of endogenous OASIS in BeWo cells decreased endogenous GCMa mRNA level and activity, and overexpression of OASIS led to placental cell fusion accompanied by connexin-43 expression.","method":"Promoter mapping, reporter assays, knockdown (siRNA), overexpression, and cell fusion assays in trophoblast cells","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding, reporter assay, KD and OE with functional readout in a single lab","pmids":["18495750"],"is_preprint":false},{"year":2009,"finding":"OASIS/CREB3L1 activates transcription of Col1a1 (type I collagen) through a UPRE-like sequence in the osteoblast-specific promoter; OASIS-/- mice exhibit severe osteopenia with decreased type I collagen in bone matrix and abnormally expanded rough ER in osteoblasts; BMP2 signaling induces OASIS expression and accelerates its regulated intramembrane proteolysis (RIP), causing mild ER stress.","method":"Knockout mouse model, promoter reporter assay, ChIP, RT-PCR, histological analysis, BMP2 treatment","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo knockout with clear phenotype, promoter reporter, ChIP, and mechanistic link to BMP2 signaling with multiple orthogonal methods","pmids":["19767743"],"is_preprint":false},{"year":2010,"finding":"Osteoblast-specific re-expression of OASIS in OASIS-/- mice rescues osteopenia and normalizes type I collagen mRNA and rough ER morphology, confirming the osteoblast-autonomous role; growth retardation in OASIS-/- mice is not rescued by osteoblast-specific OASIS and is associated with reduced serum GH and IGF-1, indicating an osteoblast-independent mechanism for this phenotype.","method":"Transgenic rescue (osteoblast-specific OASIS expression under 2.3-kb Col1a1 promoter), histology, RT-PCR, ELISA for GH and IGF-1","journal":"Bone","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo epistasis via transgenic rescue with defined cellular specificity and multiple phenotypic endpoints","pmids":["21047569"],"is_preprint":false},{"year":2011,"finding":"OASIS/CREB3L1 is proteolytically activated in response to infection by multiple viruses (murine γ-herpesvirus 68, HCV, West Nile virus, Sendai virus), allowing its N-terminus to enter the nucleus and induce cell cycle inhibitor genes to block cell proliferation; cells harboring HCV or WNV replicons require OASIS silencing to proliferate.","method":"Gene expression comparison between permissive/non-permissive cell lines, virus infection assays, nuclear translocation imaging, gene expression profiling, knockdown and complementation","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple viruses tested, nuclear translocation documented, KD confirmed necessity, with defined antiproliferative phenotypic readout","pmids":["21767813"],"is_preprint":false},{"year":2012,"finding":"OASIS/CREB3L1 and other OASIS family members are unstable proteins degraded via the ubiquitin-proteasome pathway under normal conditions; HRD1 (an ER-resident E3 ubiquitin ligase) ubiquitinates OASIS under normal conditions; ER stress dissociates the HRD1-OASIS interaction and stabilizes OASIS, enhancing target gene transcription.","method":"Co-immunoprecipitation, ubiquitination assays, HRD1 knockout cells, stability assays in transfected cells","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro ubiquitination assay, Co-IP for HRD1-OASIS interaction, genetic knockout confirming mechanism","pmids":["22705851"],"is_preprint":false},{"year":2012,"finding":"OASIS/CREB3L1 is required for differentiation of neural precursor cells into astrocytes; Oasis-/- mice have fewer astrocytes and more neural precursor cells during cortical development; the transcription factor Gcm1 was identified as an OASIS target gene required for astrocyte differentiation, and introduction of Gcm1 into Oasis-/- cells rescued differentiation by promoting demethylation of the Gfap promoter.","method":"Knockout mouse analysis, primary cell culture, Gcm1 rescue experiment, Gfap promoter methylation assay, interaction studies among OASIS family members","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with developmental phenotype, target gene identification, rescue experiment, and epigenetic mechanism, multiple orthogonal methods","pmids":["22828627"],"is_preprint":false},{"year":2012,"finding":"OASIS/CREB3L1 is required for terminal differentiation of goblet cells in the large intestine; Oasis-/- mice show reduced goblet cell number and mucus production, impaired maturation from early to mature goblet cells, abnormal mucous vesicles and rough ER; OASIS is activated by mild ER stress during goblet cell differentiation.","method":"Knockout mouse analysis, histology, goblet cell marker expression, knockdown in cell culture differentiation model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout plus in vitro KD with specific phenotypic readouts and multiple markers","pmids":["22262831"],"is_preprint":false},{"year":2012,"finding":"Doxorubicin stimulates ceramide synthesis, which activates CREB3L1 through 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 resistance to doxorubicin, while overexpression enhances sensitivity.","method":"Ceramide synthesis assay, proteolytic cleavage assay, nuclear translocation imaging, p21 reporter assay, KD and OE in cancer cell lines","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mechanistic pathway from ceramide to protease cleavage to nuclear translocation to p21 induction, with KD and OE gain/loss of function","pmids":["23256041"],"is_preprint":false},{"year":2013,"finding":"CREB3L1 acts as a metastasis suppressor in breast cancer; re-expression in metastatic cells reduces invasion and migration in vitro and suppresses metastasis in vivo; ChIP-on-chip analysis identified CREB3L1 target genes including those regulating angiogenesis; tumor regression involved impaired angiogenesis.","method":"Transfection/overexpression, invasion and migration assays, in vivo rat mammary tumor model, microarray, ChIP-on-chip","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro and in vivo loss/gain of function, ChIP-on-chip for target gene identification, multiple orthogonal readouts","pmids":["24126059"],"is_preprint":false},{"year":2013,"finding":"OASIS/CREB3L1 promotes VEGFA expression in human retinal pigment epithelial cells (ARPE-19) by directly binding to a CRE-like site at approximately -500 bp in the VEGFA promoter, as demonstrated by reporter assays with deletion/mutation constructs and chromatin immunoprecipitation.","method":"Reporter assay with deletion and point mutant constructs, chromatin immunoprecipitation (ChIP), ER stress induction in ARPE-19 cells","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct ChIP confirming binding plus mutant reporter assays in a single lab","pmids":["23383089"],"is_preprint":false},{"year":2013,"finding":"OASIS/CREB3L1 knockdown in human glioma cells attenuates the UPR (reduced BiP/GRP78 and GRP94 induction), decreases expression of chondroitin sulfate proteoglycan extracellular matrix proteins, and reduces cell migration; OASIS protein is glycosylated on Asn-513.","method":"Knockdown (siRNA), ER stress induction, gene expression analysis, migration assay, glycosylation mapping","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined functional readouts (UPR, ECM, migration), glycosylation site identified, single lab","pmids":["23335989"],"is_preprint":false},{"year":2014,"finding":"TGF-β induces proteolytic activation of CREB3L1 by suppressing expression of TM4SF20, which normally inhibits RIP of CREB3L1; the released N-terminal domain of CREB3L1 enters the nucleus and binds to Smad4 to activate transcription of collagen extracellular matrix genes.","method":"TGF-β treatment, TM4SF20 expression/knockdown, CREB3L1 cleavage assay, co-immunoprecipitation of CREB3L1 and Smad4, collagen gene reporter assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mechanistic pathway: TGF-β → TM4SF20 suppression → RIP of CREB3L1 → Smad4 binding → collagen transcription; Co-IP and functional assays","pmids":["25310401"],"is_preprint":false},{"year":2014,"finding":"OASIS regulates transcription of chondroitin 6-O-sulfotransferase 1 (C6ST1) in reactive astrocytes of injured cortex by interacting with the first intron of the C6ST1 gene; OASIS knockout mice show reduced CSPG sulfation after stab injury, and membrane fractions from OASIS-expressing astrocytes inhibit neurite outgrowth via CSPGs.","method":"OASIS knockout mouse model, in situ hybridization, RT-PCR, C6ST1 reporter assay with deletion constructs, neurite outgrowth assay with chondroitinase ABC treatment","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout, direct promoter interaction assay, functional neurite outgrowth readout with enzymatic control","pmids":["24716865"],"is_preprint":false},{"year":2015,"finding":"CREB3L1 in the rat hypothalamus acts as a transcriptional regulator of ER stress response genes (Chop, Xbp1U) in osmotically challenged magnocellular neurons; dominant-negative CREB3L1 expressed via lentiviral vector in the SON reduced Chop and Xbp1U mRNA but not BiP or Atf4, establishing CREB3L1 as a selective mediator of the UPR in these neurons.","method":"Lentiviral dominant-negative expression in rat SON in vivo, RT-PCR for UPR markers, dehydration/salt-loading model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo dominant-negative epistasis with defined molecular readouts, single lab","pmids":["25915053"],"is_preprint":false},{"year":2015,"finding":"OASIS/CREB3L1 N-terminal fragment (activated form) binds to HIF-1α through its bZIP domain, as shown by co-immunoprecipitation; this interaction promotes transcription via hypoxia-response elements (HRE) including VEGFA; OASIS-deficient mice show reduced Vegfa expression in osteoblasts and retarded bone vascularization.","method":"Co-immunoprecipitation, luciferase reporter assay (HRE), RT-PCR, immunostaining, metatarsal angiogenesis assay in Oasis-/- mice","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct Co-IP of OASIS-N and HIF-1α, reporter assay, and in vivo loss-of-function with angiogenesis readout","pmids":["26558437"],"is_preprint":false},{"year":2015,"finding":"CREB3L1 mediates cAMP positive regulation and glucocorticoid negative regulation of arginine vasopressin (AVP) gene transcription in the rat hypothalamus; shRNA silencing of Creb3l1 blunts forskolin-induced Avp promoter activity; in vivo dexamethasone reduces Creb3l1 and Avp expression induced by hyperosmotic stress.","method":"shRNA knockdown, cAMP elevation (forskolin), dexamethasone treatment, promoter reporter assay in AtT20 cells and hypothalamic organotypic cultures, in vivo injections","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo KD with reporter assay and hyperosmotic stress model, single lab","pmids":["26503226"],"is_preprint":false},{"year":2016,"finding":"CREB3L1 is required for the decidualization of human endometrial stromal cells (hESCs); siRNA knockdown of CREB3L1 impairs hormonal induction of decidualization and reduces phosphorylation of ERK1/2; CREB3L1 expression is regulated by progesterone receptor (PR) signaling in the mouse uterus.","method":"siRNA knockdown in hESCs, in vitro decidualization assay, ERK1/2 phosphorylation assay, PR knockout mouse model, progesterone treatment","journal":"Current molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with functional decidualization and ERK readout, supported by in vivo PRKO model, single lab","pmids":["26917262"],"is_preprint":false},{"year":2017,"finding":"CREB3L1 functions downstream of PERK signaling specifically in mesenchymal triple-negative breast cancer to drive invasion and metastasis; genetic or pharmacological inhibition of CREB3L1 suppresses cancer cell invasion and metastasis in this tumor subtype.","method":"Genetic knockdown/knockout of CREB3L1, pharmacological inhibition, in vitro invasion assays, in vivo metastasis models, epistasis with PERK inhibition","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and pharmacological epistasis placing CREB3L1 downstream of PERK, in vitro and in vivo loss-of-function with clear metastasis phenotype","pmids":["29057869"],"is_preprint":false},{"year":2017,"finding":"CREB3L1 acts as a downstream effector of TSH (thyrotropin) in thyroid cells to regulate secretory pathway expansion; CREB3L1 alone increases expression of ER-Golgi transport factors and induces Golgi enlargement; a dominant-negative CREB3L1 construct impairs TSH-induced Golgi expansion.","method":"TSH stimulation, dominant-negative CREB3L1 expression, Golgi morphology analysis (volume quantification), transport factor mRNA/protein measurement in thyroid cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative epistasis, quantitative Golgi morphology, and gene expression analysis with functional consequence in a secretory cell model","pmids":["29093023"],"is_preprint":false},{"year":2017,"finding":"A missense variant in the bZIP domain of CREB3L1 (p.Ala304Val) decreases type I collagen transcriptional binding ability as shown by in vitro structural modeling and luciferase assays; overexpression of mutant OASIS also decreases transcription of SEC23A and SEC24D (COPII complex components) and reduces SEC24D protein levels.","method":"In vitro structural modeling, luciferase reporter assay, overexpression of mutant OASIS, qRT-PCR and Western blot for SEC23A/SEC24D in patient-derived cells","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structural modeling plus functional reporter assay and protein level confirmation in patient-derived cells, single lab","pmids":["30657919"],"is_preprint":false},{"year":2017,"finding":"The CREB3L1 variant that disrupts the DNA-binding site prevents OASIS from acting on its transcriptional targets including SEC24D (a COPII complex component), linking CREB3L1-associated OI to impaired regulation of proteins involved in cellular secretion.","method":"Exome sequencing, functional characterization of DNA-binding variant, target gene (SEC24D) transcription analysis in patient cells","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DNA-binding variant with downstream target gene analysis, single family/lab study","pmids":["28817112"],"is_preprint":false},{"year":2020,"finding":"CREB3L1 directly binds to a G-box motif in the Pcsk1 promoter to activate transcription of the proprotein convertase PC1/3; lentiviral overexpression of Creb3l1 in rat SON increased Pcsk1, while knockdown decreased Pcsk1 expression; in vitro promoter activity and binding studies confirmed direct transcription factor binding.","method":"RNA-sequencing of Creb3l1 knockdown cells, in vitro promoter activity assay, binding studies, lentiviral overexpression/knockdown in rat SON in vivo, RT-qPCR","journal":"Journal of neuroendocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed, in vitro and in vivo KD and OE with transcriptional readout, single lab","pmids":["32319174"],"is_preprint":false},{"year":2021,"finding":"OASIS/CREB3L1 accumulates at damaged nuclear envelope (NE) in a full-length (uncleaved) form—distinct from its ER stress response as a cleaved fragment—and colocalizes with SUN2 and Nesprin-2 (LINC complex components) at damaged NE; OASIS suppresses DNA damage induced by NE stress and restores nuclear deformation; this NE accumulation is specific to OASIS among OASIS family members.","method":"Live-cell and immunofluorescence imaging of NE damage, colocalization with LINC complex proteins and NE repair factors, DNA damage assay, nuclear deformation measurement, comparison with other OASIS family members","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular localization with functional consequence (DNA damage suppression), colocalization with defined partners, single lab","pmids":["34226518"],"is_preprint":false},{"year":2022,"finding":"CREB3L1 promotes ATC invasion and metastasis by activating extracellular matrix signaling including collagen subtype expression; KPNA2 mediates nuclear translocation of CREB3L1; CREB3L1-mediated IL-1α production activates α-SMA-positive cancer-associated fibroblasts (CAFs); loss of CREB3L1 prevents CAF activation and suppresses ATC metastasis in zebrafish and mouse xenograft models.","method":"Knockdown/overexpression of CREB3L1, cytokine array, zebrafish and mouse xenograft models, single-cell RNA-seq analysis, co-culture of ATC cells and fibroblasts, ECM/collagen quantification","journal":"Molecular cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including in vivo models, cytokine array, co-culture, and identification of KPNA2 as nuclear import factor","pmids":["36192735"],"is_preprint":false},{"year":2022,"finding":"CREB3L1 and CREB3L2 are both required for Golgi enlargement during decidualization of endometrial stromal cells; simultaneous knockdown of CREB3L1 and CREB3L2 causes Golgi fragmentation, collagen accumulation in dilated ER, and decreased protein secretion; CREB3L1/CREB3L2 binding elements are enriched in promoters of co-regulated vesicular trafficking genes upregulated during decidualization.","method":"Time-course transcriptomic analysis, promoter motif analysis, simultaneous CREB3L1/CREB3L2 knockdown, Golgi morphology quantification, collagen immunofluorescence, protein secretion assay","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transcriptomics plus functional KD with Golgi and secretion phenotype; note this finding involves both CREB3L1 and CREB3L2 together","pmids":["36313580"],"is_preprint":false},{"year":2023,"finding":"OASIS/CREB3L1 arrests the cell cycle at G2/M phase after DNA damage via direct induction of p21; this G2/M arrest is dominant in astrocytes and osteoblasts but not fibroblasts, which depend on p53; in a brain injury model, Oasis-/- reactive astrocytes show sustained proliferation and prolonged gliosis; epigenomic reversal of CREB3L1 promoter hypermethylation in glioblastoma xenografts suppresses tumor growth.","method":"Knockout mouse model, cell cycle analysis (flow cytometry), p21 reporter assay, p53-null comparison, brain injury model, CRISPR-based epigenomic engineering in xenograft model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic knockout with cell cycle phenotype, direct p21 target gene induction, epistatic comparison with p53 pathway, in vivo epigenomic engineering with tumor suppression readout","pmids":["37178686"],"is_preprint":false},{"year":2023,"finding":"C5a-C5aR1 activates the PERK-eIF2α-ATF4-CREB3L1 ER stress pathway in vascular smooth muscle cells; CREB3L1 acts as a key downstream mediator that promotes COL1α1 expression to drive osteogenic transdifferentiation and vascular calcification.","method":"VSMCs calcification models in vitro, C5aR1 antagonist (PMX 53) in vivo, calcium deposition assay, Western blot/RT-PCR for pathway components, COL1α1 expression","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis established in vivo and in vitro with pharmacological and genetic tools, single lab","pmids":["37603848"],"is_preprint":false}],"current_model":"CREB3L1/OASIS is an ER-resident, transmembrane bZIP transcription factor that is stabilized by ER stress (via dissociation from the E3 ubiquitin ligase HRD1) and activated through regulated intramembrane proteolysis by Site-1 and Site-2 Proteases at the Golgi, releasing its N-terminal domain to the nucleus where it directly activates target gene transcription (including Col1a1, p21, VEGFA, Pcsk1, and SEC24D) through CRE/UPRE-like elements; it functions downstream of BMP2, TGF-β, PERK, and cAMP/glucocorticoid signaling to control osteoblast differentiation and bone matrix secretion, astrocyte differentiation, goblet cell maturation, decidualization, secretory pathway expansion (Golgi enlargement via transport factor induction), and cell-cycle arrest at G2/M; it also binds HIF-1α to regulate angiogenic gene expression, mediates anti-viral and anti-tumor proliferative responses, and in its full-length uncleaved form accumulates at damaged nuclear envelopes to suppress DNA damage."},"narrative":{"mechanistic_narrative":"CREB3L1 (OASIS) is an endoplasmic reticulum-resident, transmembrane bZIP transcription factor that couples ER and secretory stress to a transcriptional program controlling secretory-cell differentiation, extracellular matrix production, and proliferative arrest [PMID:15665855, PMID:19767743]. Under basal conditions it is held inactive: the transmembrane domain suppresses transcriptional activity and tethers the protein to the ER [PMID:12054625], and the ER-resident E3 ligase HRD1 ubiquitinates CREB3L1 to target it for proteasomal degradation [PMID:22705851]. ER stress dissociates the HRD1 interaction and triggers translocation to the Golgi, where Site-1 and Site-2 Proteases cleave the protein by regulated intramembrane proteolysis, liberating the N-terminal bZIP fragment that enters the nucleus and activates targets through CRE/UPRE-like elements [PMID:16417584, PMID:22705851]. Diverse upstream signals converge on this proteolytic switch: BMP2 accelerates CREB3L1 RIP during osteoblast differentiation [PMID:19767743], TGF-β induces cleavage by suppressing the inhibitor TM4SF20, after which the released fragment partners with Smad4 to drive collagen genes [PMID:25310401], ceramide generated in response to doxorubicin activates cleavage [PMID:23256041], and the PERK–eIF2α–ATF4 arm of the UPR feeds into CREB3L1 in vascular smooth muscle [PMID:37603848]. Once nuclear, CREB3L1 directly transactivates a coherent set of targets including Col1a1 [PMID:19767743], the cell-cycle inhibitor p21 [PMID:23256041], VEGFA [PMID:23383089], Pcsk1 [PMID:32319174], and COPII components SEC23A/SEC24D [PMID:30657919], and it cooperates with HIF-1α via its bZIP domain to drive hypoxia-responsive angiogenic genes [PMID:26558437]. Through these targets CREB3L1 governs osteoblast collagen secretion and bone formation [PMID:19767743, PMID:21047569], astrocyte and goblet-cell differentiation [PMID:22828627, PMID:22262831], secretory-pathway and Golgi expansion in secretory cells [PMID:29093023, PMID:36313580], DNA-damage-induced G2/M arrest [PMID:37178686], and antiviral/antiproliferative responses [PMID:21767813], while acting as a metastasis suppressor in some carcinomas yet a pro-invasive effector downstream of PERK in others [PMID:24126059, PMID:29057869, PMID:36192735]. An uncleaved, full-length pool of CREB3L1 additionally accumulates at damaged nuclear envelopes with LINC-complex components SUN2 and Nesprin-2 to suppress DNA damage [PMID:34226518]. Loss-of-function and bZIP-domain missense variants of CREB3L1 cause osteogenesis imperfecta, mechanistically linked to impaired type I collagen and SEC24D-dependent secretion [PMID:30657919, PMID:28817112].","teleology":[{"year":1999,"claim":"Establishing that a CREB/ATF-family factor with a transmembrane domain is induced by CNS injury hinted that this transcription factor is regulated by membrane localization rather than constitutive nuclear residence.","evidence":"Differential display and in situ hybridization in astrocytes, mouse embryo, and injured brain","pmids":["10350641"],"confidence":"Medium","gaps":["No functional assay of the protein","Mechanism of activation unknown","Target genes not identified"]},{"year":2002,"claim":"Mapping the autoinhibitory role of the transmembrane domain answered how the factor is kept inactive, showing membrane tethering suppresses CRE-dependent transcription until released.","evidence":"GAL4-luciferase reporters, gel shift, and localization with deletion constructs in COS7 cells","pmids":["12054625"],"confidence":"Medium","gaps":["Physiological cleavage mechanism not defined","Endogenous targets not shown","No demonstration of stress regulation"]},{"year":2005,"claim":"Demonstrating ER-stress-induced cleavage and nuclear translocation established CREB3L1 as a membrane-bound UPR transcription factor that protects against ER-stress-induced death.","evidence":"Cleavage and translocation assays, reporter assays, siRNA knockdown and overexpression in astrocytes","pmids":["15665855"],"confidence":"High","gaps":["Identity of cleaving proteases not yet established","Full UPR target spectrum unknown"]},{"year":2006,"claim":"Identifying S1P and S2P as the processing proteases at the Golgi defined the regulated intramembrane proteolysis mechanism and distinguished CREB3L1 from ATF6 by its lack of a canonical Golgi localization signal.","evidence":"Protease inhibitor assays, deletion mutagenesis, and subcellular localization in transfected cells","pmids":["16417584"],"confidence":"High","gaps":["ER-to-Golgi trafficking trigger not defined","Regulation of protease access unknown"]},{"year":2009,"claim":"Knockout and Col1a1 promoter studies established the in vivo role of CREB3L1 in osteoblast collagen secretion and bone formation, linking BMP2 signaling to its proteolytic activation.","evidence":"OASIS-/- mice, promoter reporter, ChIP, histology, and BMP2 treatment","pmids":["19767743"],"confidence":"High","gaps":["Whether bone phenotype is fully osteoblast-autonomous not yet resolved","Other matrix targets not mapped"]},{"year":2010,"claim":"Osteoblast-specific transgenic rescue separated the cell-autonomous bone phenotype from a systemic growth phenotype, refining where CREB3L1 acts in skeletal biology.","evidence":"Transgenic rescue under Col1a1 promoter, histology, RT-PCR, GH/IGF-1 ELISA in OASIS-/- mice","pmids":["21047569"],"confidence":"High","gaps":["Mechanism of the osteoblast-independent growth defect unresolved","GH/IGF-1 regulatory link not mechanistically defined"]},{"year":2012,"claim":"Discovering HRD1-mediated ubiquitination and its dissociation under ER stress explained how CREB3L1 abundance is gated, adding a degradation layer upstream of proteolytic activation.","evidence":"Co-IP, in vitro ubiquitination assays, HRD1 knockout cells, and stability assays","pmids":["22705851"],"confidence":"High","gaps":["Signal that disrupts HRD1 binding not defined","Relative contribution of degradation vs RIP unclear"]},{"year":2012,"claim":"Knockout analyses extended CREB3L1 function to astrocyte and goblet-cell differentiation, identifying Gcm1 and epigenetic Gfap demethylation as a downstream differentiation axis.","evidence":"Oasis-/- mice, primary culture, Gcm1 rescue, Gfap promoter methylation, and goblet cell histology","pmids":["22828627","22262831"],"confidence":"High","gaps":["Direct binding of CREB3L1 to all differentiation targets not fully mapped","Tissue specificity of target selection unexplained"]},{"year":2011,"claim":"Showing virus-induced proteolytic activation and antiproliferative gene induction revealed CREB3L1 as an antiviral effector restricting host-cell proliferation needed for replication.","evidence":"Permissive/non-permissive cell comparison, viral infection, translocation imaging, knockdown and complementation","pmids":["21767813"],"confidence":"High","gaps":["Sensor linking infection to cleavage not identified","Breadth of cell-cycle targets incomplete"]},{"year":2012,"claim":"Linking ceramide-driven cleavage to p21 induction connected a chemotherapy stress signal to CREB3L1-dependent cell-cycle arrest and drug sensitivity.","evidence":"Ceramide synthesis and cleavage assays, p21 reporter, knockdown and overexpression in cancer lines","pmids":["23256041"],"confidence":"High","gaps":["How ceramide promotes ER-to-Golgi trafficking unclear","p53-independence not yet examined"]},{"year":2013,"claim":"Identifying CREB3L1 as a metastasis suppressor and a direct VEGFA activator established opposing roles in tumor biology and angiogenesis, with direct CRE-like promoter binding.","evidence":"Overexpression, invasion/migration assays, rat mammary tumor model, ChIP-on-chip; VEGFA promoter ChIP and mutant reporters in ARPE-19 cells","pmids":["24126059","23383089"],"confidence":"High","gaps":["Context determining suppressor vs promoter role unknown","Direct angiogenic target set incompletely defined"]},{"year":2014,"claim":"Defining the TGF-β→TM4SF20→RIP→Smad4 axis and astrocyte ECM regulation showed how CREB3L1 partners with other factors to drive collagen and chondroitin sulfate matrix programs.","evidence":"TGF-β treatment, TM4SF20 manipulation, cleavage assay, CREB3L1–Smad4 Co-IP; C6ST1 reporter and neurite outgrowth assays in OASIS-/- mice; glycosylation mapping","pmids":["25310401","24716865","23335989"],"confidence":"High","gaps":["Generality of Smad4 cooperation across cell types unknown","Functional role of Asn-513 glycosylation undefined"]},{"year":2015,"claim":"Hypothalamic and HIF-1α studies revealed neuroendocrine UPR control and a bZIP-mediated CREB3L1–HIF-1α partnership driving angiogenic transcription.","evidence":"Dominant-negative/shRNA in rat SON, UPR marker RT-PCR, forskolin/dexamethasone assays; CREB3L1–HIF-1α Co-IP, HRE reporters, metatarsal angiogenesis in Oasis-/- mice","pmids":["25915053","26503226","26558437"],"confidence":"High","gaps":["Selectivity for Chop/Xbp1U over other UPR genes unexplained","Stoichiometry of CREB3L1–HIF-1α complex unknown"]},{"year":2016,"claim":"Knockdown in endometrial stromal cells placed CREB3L1 downstream of progesterone receptor signaling in decidualization, linking it to ERK1/2 activation.","evidence":"siRNA in hESCs, decidualization assay, ERK1/2 phosphorylation, PR knockout mouse","pmids":["26917262"],"confidence":"Medium","gaps":["Direct decidualization targets not identified","Mechanism connecting CREB3L1 to ERK unclear"]},{"year":2017,"claim":"TSH-driven secretory-pathway expansion and PERK-dependent breast cancer invasion studies established CREB3L1 as a master regulator of Golgi/secretory capacity that can be co-opted to promote metastasis in specific tumor subtypes.","evidence":"Dominant-negative CREB3L1 with Golgi morphometry in thyroid cells; genetic/pharmacological CREB3L1 inhibition with PERK epistasis in TNBC models","pmids":["29093023","29057869"],"confidence":"High","gaps":["Transport-factor target genes only partially enumerated","Determinants of pro- vs anti-tumor outcome unresolved"]},{"year":2017,"claim":"Functional characterization of a bZIP missense variant (p.Ala304Val) and DNA-binding variants linked CREB3L1 loss-of-function to osteogenesis imperfecta through impaired collagen and SEC24D-dependent secretion.","evidence":"Structural modeling, luciferase assays, mutant overexpression, and SEC23A/SEC24D expression in patient-derived cells; exome sequencing","pmids":["30657919","28817112"],"confidence":"Medium","gaps":["Genotype–phenotype correlation across families incomplete","Quantitative contribution of SEC24D loss to OI severity unclear"]},{"year":2020,"claim":"Identifying Pcsk1 as a direct G-box target in the SON extended CREB3L1's neuroendocrine role to proprotein convertase expression.","evidence":"RNA-seq, promoter activity and binding assays, lentiviral overexpression/knockdown in rat SON","pmids":["32319174"],"confidence":"Medium","gaps":["Physiological consequence of Pcsk1 regulation not measured","Single lab"]},{"year":2021,"claim":"Discovering that full-length, uncleaved CREB3L1 accumulates at damaged nuclear envelopes revealed a transcription-independent function in nuclear envelope/DNA damage protection distinct from its UPR role.","evidence":"Live-cell and IF imaging of NE damage, colocalization with SUN2/Nesprin-2, DNA damage and nuclear deformation assays","pmids":["34226518"],"confidence":"Medium","gaps":["Molecular mechanism of NE protection undefined","How full-length form is selectively retained unclear","Single lab"]},{"year":2022,"claim":"Thyroid cancer and decidualization studies clarified how CREB3L1 drives invasion via ECM/IL-1α-mediated CAF activation (with KPNA2 as nuclear import factor) and how CREB3L1/CREB3L2 together sustain Golgi expansion and secretion.","evidence":"Knockdown/overexpression, cytokine array, scRNA-seq, zebrafish/mouse xenografts, co-culture; combined CREB3L1/CREB3L2 knockdown with Golgi and secretion assays","pmids":["36192735","36313580"],"confidence":"High","gaps":["Redundancy boundaries between CREB3L1 and CREB3L2 not fully mapped","Direct IL-1α promoter regulation not shown"]},{"year":2023,"claim":"Defining a cell-type-specific p21-dependent G2/M arrest and the C5a-PERK-ATF4-CREB3L1 calcification axis unified CREB3L1's roles in proliferation control and osteogenic transdifferentiation, with epigenetic reactivation suppressing glioblastoma growth.","evidence":"Oasis-/- mice, flow cytometry, p21 reporter, p53-null comparison, brain injury and CRISPR epigenomic xenograft models; VSMC calcification with C5aR1 antagonist","pmids":["37178686","37603848"],"confidence":"High","gaps":["Basis of cell-type dominance of CREB3L1 vs p53 arrest unexplained","Therapeutic window of epigenetic reactivation undefined"]},{"year":null,"claim":"How CREB3L1 trafficking, cleavage, and target selection are differentially tuned across cell types to produce opposite outcomes (tumor suppression vs promotion; transcriptional vs nuclear-envelope-protective roles) remains the central open question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the activated bZIP fragment bound to DNA or HIF-1α/Smad4","Determinants of context-dependent function unknown","Trigger for ER-to-Golgi translocation incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,5,11,13,25]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,13,23,24,25]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[5,11]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,2,3]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,11]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[2,5,15,30]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,11,13,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,9,10]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,29]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[5,15,16,27]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[23,24]}],"complexes":[],"partners":["HRD1","SMAD4","HIF1A","TM4SF20","SUN2","SYNE2","KPNA2"],"other_free_text":[]}},"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":295,"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":247,"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 / Moderate — initial identification with in situ hybridization and expression analysis, replicated in multiple tissues/conditions, no direct functional assay of the protein\",\n      \"pmids\": [\"10350641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"OASIS functions as a transcriptional activator through CRE binding; the transmembrane domain suppresses transcriptional activity and retains OASIS in the ER, while truncation of the transmembrane domain increases transcriptional activity and relocates OASIS to the nucleus.\",\n      \"method\": \"GAL4-UAS-luciferase reporter assay, gel shift assay, subcellular localization by Western blot, deletion constructs in COS7 cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay, gel shift, and localization experiments in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"12054625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"OASIS/CREB3L1 is a membrane-bound ER-resident transcription factor that is cleaved at the membrane in response to ER stress, releasing its cytoplasmic bZIP-containing N-terminal domain to translocate to the nucleus where it activates target genes via ER stress-responsive and cAMP-responsive elements; knockdown reduced BiP levels and exacerbated ER stress in astrocytes, while overexpression induced BiP and suppressed ER-stress-induced cell death.\",\n      \"method\": \"Membrane cleavage assay, nuclear translocation imaging, reporter gene assay, knockdown (siRNA), overexpression in astrocytes\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (cleavage assay, localization, reporter, KD, OE) in a single rigorous study with defined phenotypic readouts\",\n      \"pmids\": [\"15665855\"],\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) at the Golgi apparatus in response to ER stress, similar to ATF6; cleavage is triggered by translocation of OASIS from the ER to the Golgi, but unlike ATF6, luminal domain deletion mutants retain intact proteolytic processing, indicating OASIS lacks a canonical Golgi localization signal.\",\n      \"method\": \"Protease inhibitor assays, deletion mutagenesis, subcellular fractionation/localization in transfected cells\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic identification of S1P/S2P as the processing proteases with deletion mutagenesis and localization, replicated mechanistic detail\",\n      \"pmids\": [\"16417584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"OASIS/CREB3L1 binds and stimulates the promoter of the transcription factor GCMa/Gcm1 in trophoblast cells; knockdown of endogenous OASIS in BeWo cells decreased endogenous GCMa mRNA level and activity, and overexpression of OASIS led to placental cell fusion accompanied by connexin-43 expression.\",\n      \"method\": \"Promoter mapping, reporter assays, knockdown (siRNA), overexpression, and cell fusion assays in trophoblast cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding, reporter assay, KD and OE with functional readout in a single lab\",\n      \"pmids\": [\"18495750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"OASIS/CREB3L1 activates transcription of Col1a1 (type I collagen) through a UPRE-like sequence in the osteoblast-specific promoter; OASIS-/- mice exhibit severe osteopenia with decreased type I collagen in bone matrix and abnormally expanded rough ER in osteoblasts; BMP2 signaling induces OASIS expression and accelerates its regulated intramembrane proteolysis (RIP), causing mild ER stress.\",\n      \"method\": \"Knockout mouse model, promoter reporter assay, ChIP, RT-PCR, histological analysis, BMP2 treatment\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo knockout with clear phenotype, promoter reporter, ChIP, and mechanistic link to BMP2 signaling with multiple orthogonal methods\",\n      \"pmids\": [\"19767743\"],\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 and rough ER morphology, confirming the osteoblast-autonomous role; growth retardation in OASIS-/- mice is not rescued by osteoblast-specific OASIS and is associated with reduced serum GH and IGF-1, indicating an osteoblast-independent mechanism for this phenotype.\",\n      \"method\": \"Transgenic rescue (osteoblast-specific OASIS expression under 2.3-kb Col1a1 promoter), histology, RT-PCR, ELISA for GH and IGF-1\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo epistasis via transgenic rescue with defined cellular specificity and multiple phenotypic endpoints\",\n      \"pmids\": [\"21047569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"OASIS/CREB3L1 is proteolytically activated in response to infection by multiple viruses (murine γ-herpesvirus 68, HCV, West Nile virus, Sendai virus), allowing its N-terminus to enter the nucleus and induce cell cycle inhibitor genes to block cell proliferation; cells harboring HCV or WNV replicons require OASIS silencing to proliferate.\",\n      \"method\": \"Gene expression comparison between permissive/non-permissive cell lines, virus infection assays, nuclear translocation imaging, gene expression profiling, knockdown and complementation\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple viruses tested, nuclear translocation documented, KD confirmed necessity, with defined antiproliferative phenotypic readout\",\n      \"pmids\": [\"21767813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OASIS/CREB3L1 and other OASIS family members are unstable proteins degraded via the ubiquitin-proteasome pathway under normal conditions; HRD1 (an ER-resident E3 ubiquitin ligase) ubiquitinates OASIS under normal conditions; ER stress dissociates the HRD1-OASIS interaction and stabilizes OASIS, enhancing target gene transcription.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, HRD1 knockout cells, stability assays in transfected cells\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro ubiquitination assay, Co-IP for HRD1-OASIS interaction, genetic knockout confirming mechanism\",\n      \"pmids\": [\"22705851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OASIS/CREB3L1 is required for differentiation of neural precursor cells into astrocytes; Oasis-/- mice have fewer astrocytes and more neural precursor cells during cortical development; the transcription factor Gcm1 was identified as an OASIS target gene required for astrocyte differentiation, and introduction of Gcm1 into Oasis-/- cells rescued differentiation by promoting demethylation of the Gfap promoter.\",\n      \"method\": \"Knockout mouse analysis, primary cell culture, Gcm1 rescue experiment, Gfap promoter methylation assay, interaction studies among OASIS family members\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with developmental phenotype, target gene identification, rescue experiment, and epigenetic mechanism, multiple orthogonal methods\",\n      \"pmids\": [\"22828627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OASIS/CREB3L1 is required for terminal differentiation of goblet cells in the large intestine; Oasis-/- mice show reduced goblet cell number and mucus production, impaired maturation from early to mature goblet cells, abnormal mucous vesicles and rough ER; OASIS is activated by mild ER stress during goblet cell differentiation.\",\n      \"method\": \"Knockout mouse analysis, histology, goblet cell marker expression, knockdown in cell culture differentiation model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout plus in vitro KD with specific phenotypic readouts and multiple markers\",\n      \"pmids\": [\"22262831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Doxorubicin stimulates ceramide synthesis, which activates CREB3L1 through 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 resistance to doxorubicin, while overexpression enhances sensitivity.\",\n      \"method\": \"Ceramide synthesis assay, proteolytic cleavage assay, nuclear translocation imaging, p21 reporter assay, KD and OE in cancer cell lines\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mechanistic pathway from ceramide to protease cleavage to nuclear translocation to p21 induction, with KD and OE gain/loss of function\",\n      \"pmids\": [\"23256041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CREB3L1 acts as a metastasis suppressor in breast cancer; re-expression in metastatic cells reduces invasion and migration in vitro and suppresses metastasis in vivo; ChIP-on-chip analysis identified CREB3L1 target genes including those regulating angiogenesis; tumor regression involved impaired angiogenesis.\",\n      \"method\": \"Transfection/overexpression, invasion and 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 / Strong — in vitro and in vivo loss/gain of function, ChIP-on-chip for target gene identification, multiple orthogonal readouts\",\n      \"pmids\": [\"24126059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"OASIS/CREB3L1 promotes VEGFA expression in human retinal pigment epithelial cells (ARPE-19) by directly binding to a CRE-like site at approximately -500 bp in the VEGFA promoter, as demonstrated by reporter assays with deletion/mutation constructs and chromatin immunoprecipitation.\",\n      \"method\": \"Reporter assay with deletion and point mutant constructs, chromatin immunoprecipitation (ChIP), ER stress induction in ARPE-19 cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct ChIP confirming binding plus mutant reporter assays in a single lab\",\n      \"pmids\": [\"23383089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"OASIS/CREB3L1 knockdown in human glioma cells attenuates the UPR (reduced BiP/GRP78 and GRP94 induction), decreases expression of chondroitin sulfate proteoglycan extracellular matrix proteins, and reduces cell migration; OASIS protein is glycosylated on Asn-513.\",\n      \"method\": \"Knockdown (siRNA), ER stress induction, gene expression analysis, migration assay, glycosylation mapping\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined functional readouts (UPR, ECM, migration), glycosylation site identified, single lab\",\n      \"pmids\": [\"23335989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TGF-β induces proteolytic activation of CREB3L1 by suppressing expression of TM4SF20, which normally inhibits RIP of CREB3L1; the released N-terminal domain of CREB3L1 enters the nucleus and binds to Smad4 to activate transcription of collagen extracellular matrix genes.\",\n      \"method\": \"TGF-β treatment, TM4SF20 expression/knockdown, CREB3L1 cleavage assay, co-immunoprecipitation of CREB3L1 and Smad4, collagen gene reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mechanistic pathway: TGF-β → TM4SF20 suppression → RIP of CREB3L1 → Smad4 binding → collagen transcription; Co-IP and functional assays\",\n      \"pmids\": [\"25310401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"OASIS regulates transcription of chondroitin 6-O-sulfotransferase 1 (C6ST1) in reactive astrocytes of injured cortex by interacting with the first intron of the C6ST1 gene; OASIS knockout mice show reduced CSPG sulfation after stab injury, and membrane fractions from OASIS-expressing astrocytes inhibit neurite outgrowth via CSPGs.\",\n      \"method\": \"OASIS knockout mouse model, in situ hybridization, RT-PCR, C6ST1 reporter assay with deletion constructs, neurite outgrowth assay with chondroitinase ABC treatment\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout, direct promoter interaction assay, functional neurite outgrowth readout with enzymatic control\",\n      \"pmids\": [\"24716865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CREB3L1 in the rat hypothalamus acts as a transcriptional regulator of ER stress response genes (Chop, Xbp1U) in osmotically challenged magnocellular neurons; dominant-negative CREB3L1 expressed via lentiviral vector in the SON reduced Chop and Xbp1U mRNA but not BiP or Atf4, establishing CREB3L1 as a selective mediator of the UPR in these neurons.\",\n      \"method\": \"Lentiviral dominant-negative expression in rat SON in vivo, RT-PCR for UPR markers, dehydration/salt-loading model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo dominant-negative epistasis with defined molecular readouts, single lab\",\n      \"pmids\": [\"25915053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"OASIS/CREB3L1 N-terminal fragment (activated form) binds to HIF-1α through its bZIP domain, as shown by co-immunoprecipitation; this interaction promotes transcription via hypoxia-response elements (HRE) including VEGFA; OASIS-deficient mice show reduced Vegfa expression in osteoblasts and retarded bone vascularization.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay (HRE), RT-PCR, immunostaining, metatarsal angiogenesis assay in Oasis-/- mice\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct Co-IP of OASIS-N and HIF-1α, reporter assay, and in vivo loss-of-function with angiogenesis readout\",\n      \"pmids\": [\"26558437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CREB3L1 mediates cAMP positive regulation and glucocorticoid negative regulation of arginine vasopressin (AVP) gene transcription in the rat hypothalamus; shRNA silencing of Creb3l1 blunts forskolin-induced Avp promoter activity; in vivo dexamethasone reduces Creb3l1 and Avp expression induced by hyperosmotic stress.\",\n      \"method\": \"shRNA knockdown, cAMP elevation (forskolin), dexamethasone treatment, promoter reporter assay in AtT20 cells and hypothalamic organotypic cultures, in vivo injections\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo KD with reporter assay and hyperosmotic stress model, single lab\",\n      \"pmids\": [\"26503226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CREB3L1 is required for the decidualization of human endometrial stromal cells (hESCs); siRNA knockdown of CREB3L1 impairs hormonal induction of decidualization and reduces phosphorylation of ERK1/2; CREB3L1 expression is regulated by progesterone receptor (PR) signaling in the mouse uterus.\",\n      \"method\": \"siRNA knockdown in hESCs, in vitro decidualization assay, ERK1/2 phosphorylation assay, PR knockout mouse model, progesterone treatment\",\n      \"journal\": \"Current molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with functional decidualization and ERK readout, supported by in vivo PRKO model, single lab\",\n      \"pmids\": [\"26917262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CREB3L1 functions downstream of PERK signaling specifically in mesenchymal triple-negative breast cancer to drive invasion and metastasis; genetic or pharmacological inhibition of CREB3L1 suppresses cancer cell invasion and metastasis in this tumor subtype.\",\n      \"method\": \"Genetic knockdown/knockout of CREB3L1, pharmacological inhibition, in vitro invasion assays, in vivo metastasis models, epistasis with PERK inhibition\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and pharmacological epistasis placing CREB3L1 downstream of PERK, in vitro and in vivo loss-of-function with clear metastasis phenotype\",\n      \"pmids\": [\"29057869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CREB3L1 acts as a downstream effector of TSH (thyrotropin) in thyroid cells to regulate secretory pathway expansion; CREB3L1 alone increases expression of ER-Golgi transport factors and induces Golgi enlargement; a dominant-negative CREB3L1 construct impairs TSH-induced Golgi expansion.\",\n      \"method\": \"TSH stimulation, dominant-negative CREB3L1 expression, Golgi morphology analysis (volume quantification), transport factor mRNA/protein measurement in thyroid cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative epistasis, quantitative Golgi morphology, and gene expression analysis with functional consequence in a secretory cell model\",\n      \"pmids\": [\"29093023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A missense variant in the bZIP domain of CREB3L1 (p.Ala304Val) decreases type I collagen transcriptional binding ability as shown by in vitro structural modeling and luciferase assays; overexpression of mutant OASIS also decreases transcription of SEC23A and SEC24D (COPII complex components) and reduces SEC24D protein levels.\",\n      \"method\": \"In vitro structural modeling, luciferase reporter assay, overexpression of mutant OASIS, qRT-PCR and Western blot for SEC23A/SEC24D in patient-derived cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structural modeling plus functional reporter assay and protein level confirmation in patient-derived cells, single lab\",\n      \"pmids\": [\"30657919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The CREB3L1 variant that disrupts the DNA-binding site prevents OASIS from acting on its transcriptional targets including SEC24D (a COPII complex component), linking CREB3L1-associated OI to impaired regulation of proteins involved in cellular secretion.\",\n      \"method\": \"Exome sequencing, functional characterization of DNA-binding variant, target gene (SEC24D) transcription analysis in patient cells\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DNA-binding variant with downstream target gene analysis, single family/lab study\",\n      \"pmids\": [\"28817112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CREB3L1 directly binds to a G-box motif in the Pcsk1 promoter to activate transcription of the proprotein convertase PC1/3; lentiviral overexpression of Creb3l1 in rat SON increased Pcsk1, while knockdown decreased Pcsk1 expression; in vitro promoter activity and binding studies confirmed direct transcription factor binding.\",\n      \"method\": \"RNA-sequencing of Creb3l1 knockdown cells, in vitro promoter activity assay, binding studies, lentiviral overexpression/knockdown in rat SON in vivo, RT-qPCR\",\n      \"journal\": \"Journal of neuroendocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed, in vitro and in vivo KD and OE with transcriptional readout, single lab\",\n      \"pmids\": [\"32319174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"OASIS/CREB3L1 accumulates at damaged nuclear envelope (NE) in a full-length (uncleaved) form—distinct from its ER stress response as a cleaved fragment—and colocalizes with SUN2 and Nesprin-2 (LINC complex components) at damaged NE; OASIS suppresses DNA damage induced by NE stress and restores nuclear deformation; this NE accumulation is specific to OASIS among OASIS family members.\",\n      \"method\": \"Live-cell and immunofluorescence imaging of NE damage, colocalization with LINC complex proteins and NE repair factors, DNA damage assay, nuclear deformation measurement, comparison with other OASIS family members\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular localization with functional consequence (DNA damage suppression), colocalization with defined partners, single lab\",\n      \"pmids\": [\"34226518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CREB3L1 promotes ATC invasion and metastasis by activating extracellular matrix signaling including collagen subtype expression; KPNA2 mediates nuclear translocation of CREB3L1; CREB3L1-mediated IL-1α production activates α-SMA-positive cancer-associated fibroblasts (CAFs); loss of CREB3L1 prevents CAF activation and suppresses ATC metastasis in zebrafish and mouse xenograft models.\",\n      \"method\": \"Knockdown/overexpression of CREB3L1, cytokine array, zebrafish and mouse xenograft models, single-cell RNA-seq analysis, co-culture of ATC cells and fibroblasts, ECM/collagen quantification\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including in vivo models, cytokine array, co-culture, and identification of KPNA2 as nuclear import factor\",\n      \"pmids\": [\"36192735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CREB3L1 and CREB3L2 are both required for Golgi enlargement during decidualization of endometrial stromal cells; simultaneous knockdown of CREB3L1 and CREB3L2 causes Golgi fragmentation, collagen accumulation in dilated ER, and decreased protein secretion; CREB3L1/CREB3L2 binding elements are enriched in promoters of co-regulated vesicular trafficking genes upregulated during decidualization.\",\n      \"method\": \"Time-course transcriptomic analysis, promoter motif analysis, simultaneous CREB3L1/CREB3L2 knockdown, Golgi morphology quantification, collagen immunofluorescence, protein secretion assay\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transcriptomics plus functional KD with Golgi and secretion phenotype; note this finding involves both CREB3L1 and CREB3L2 together\",\n      \"pmids\": [\"36313580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"OASIS/CREB3L1 arrests the cell cycle at G2/M phase after DNA damage via direct induction of p21; this G2/M arrest is dominant in astrocytes and osteoblasts but not fibroblasts, which depend on p53; in a brain injury model, Oasis-/- reactive astrocytes show sustained proliferation and prolonged gliosis; epigenomic reversal of CREB3L1 promoter hypermethylation in glioblastoma xenografts suppresses tumor growth.\",\n      \"method\": \"Knockout mouse model, cell cycle analysis (flow cytometry), p21 reporter assay, p53-null comparison, brain injury model, CRISPR-based epigenomic engineering in xenograft model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic knockout with cell cycle phenotype, direct p21 target gene induction, epistatic comparison with p53 pathway, in vivo epigenomic engineering with tumor suppression readout\",\n      \"pmids\": [\"37178686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"C5a-C5aR1 activates the PERK-eIF2α-ATF4-CREB3L1 ER stress pathway in vascular smooth muscle cells; CREB3L1 acts as a key downstream mediator that promotes COL1α1 expression to drive osteogenic transdifferentiation and vascular calcification.\",\n      \"method\": \"VSMCs calcification models in vitro, C5aR1 antagonist (PMX 53) in vivo, calcium deposition assay, Western blot/RT-PCR for pathway components, COL1α1 expression\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis established in vivo and in vitro with pharmacological and genetic tools, single lab\",\n      \"pmids\": [\"37603848\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CREB3L1/OASIS is an ER-resident, transmembrane bZIP transcription factor that is stabilized by ER stress (via dissociation from the E3 ubiquitin ligase HRD1) and activated through regulated intramembrane proteolysis by Site-1 and Site-2 Proteases at the Golgi, releasing its N-terminal domain to the nucleus where it directly activates target gene transcription (including Col1a1, p21, VEGFA, Pcsk1, and SEC24D) through CRE/UPRE-like elements; it functions downstream of BMP2, TGF-β, PERK, and cAMP/glucocorticoid signaling to control osteoblast differentiation and bone matrix secretion, astrocyte differentiation, goblet cell maturation, decidualization, secretory pathway expansion (Golgi enlargement via transport factor induction), and cell-cycle arrest at G2/M; it also binds HIF-1α to regulate angiogenic gene expression, mediates anti-viral and anti-tumor proliferative responses, and in its full-length uncleaved form accumulates at damaged nuclear envelopes to suppress DNA damage.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CREB3L1 (OASIS) is an endoplasmic reticulum-resident, transmembrane bZIP transcription factor that couples ER and secretory stress to a transcriptional program controlling secretory-cell differentiation, extracellular matrix production, and proliferative arrest [#2, #5]. Under basal conditions it is held inactive: the transmembrane domain suppresses transcriptional activity and tethers the protein to the ER [#1], and the ER-resident E3 ligase HRD1 ubiquitinates CREB3L1 to target it for proteasomal degradation [#8]. ER stress dissociates the HRD1 interaction and triggers translocation to the Golgi, where Site-1 and Site-2 Proteases cleave the protein by regulated intramembrane proteolysis, liberating the N-terminal bZIP fragment that enters the nucleus and activates targets through CRE/UPRE-like elements [#3, #8]. Diverse upstream signals converge on this proteolytic switch: BMP2 accelerates CREB3L1 RIP during osteoblast differentiation [#5], TGF-\\u03b2 induces cleavage by suppressing the inhibitor TM4SF20, after which the released fragment partners with Smad4 to drive collagen genes [#15], ceramide generated in response to doxorubicin activates cleavage [#11], and the PERK\\u2013eIF2\\u03b1\\u2013ATF4 arm of the UPR feeds into CREB3L1 in vascular smooth muscle [#30]. Once nuclear, CREB3L1 directly transactivates a coherent set of targets including Col1a1 [#5], the cell-cycle inhibitor p21 [#11], VEGFA [#13], Pcsk1 [#25], and COPII components SEC23A/SEC24D [#23], and it cooperates with HIF-1\\u03b1 via its bZIP domain to drive hypoxia-responsive angiogenic genes [#18]. Through these targets CREB3L1 governs osteoblast collagen secretion and bone formation [#5, #6], astrocyte and goblet-cell differentiation [#9, #10], secretory-pathway and Golgi expansion in secretory cells [#22, #28], DNA-damage-induced G2/M arrest [#29], and antiviral/antiproliferative responses [#7], while acting as a metastasis suppressor in some carcinomas yet a pro-invasive effector downstream of PERK in others [#12, #21, #27]. An uncleaved, full-length pool of CREB3L1 additionally accumulates at damaged nuclear envelopes with LINC-complex components SUN2 and Nesprin-2 to suppress DNA damage [#26]. Loss-of-function and bZIP-domain missense variants of CREB3L1 cause osteogenesis imperfecta, mechanistically linked to impaired type I collagen and SEC24D-dependent secretion [#23, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that a CREB/ATF-family factor with a transmembrane domain is induced by CNS injury hinted that this transcription factor is regulated by membrane localization rather than constitutive nuclear residence.\",\n      \"evidence\": \"Differential display and in situ hybridization in astrocytes, mouse embryo, and injured brain\",\n      \"pmids\": [\"10350641\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional assay of the protein\", \"Mechanism of activation unknown\", \"Target genes not identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping the autoinhibitory role of the transmembrane domain answered how the factor is kept inactive, showing membrane tethering suppresses CRE-dependent transcription until released.\",\n      \"evidence\": \"GAL4-luciferase reporters, gel shift, and localization with deletion constructs in COS7 cells\",\n      \"pmids\": [\"12054625\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological cleavage mechanism not defined\", \"Endogenous targets not shown\", \"No demonstration of stress regulation\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating ER-stress-induced cleavage and nuclear translocation established CREB3L1 as a membrane-bound UPR transcription factor that protects against ER-stress-induced death.\",\n      \"evidence\": \"Cleavage and translocation assays, reporter assays, siRNA knockdown and overexpression in astrocytes\",\n      \"pmids\": [\"15665855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of cleaving proteases not yet established\", \"Full UPR target spectrum unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying S1P and S2P as the processing proteases at the Golgi defined the regulated intramembrane proteolysis mechanism and distinguished CREB3L1 from ATF6 by its lack of a canonical Golgi localization signal.\",\n      \"evidence\": \"Protease inhibitor assays, deletion mutagenesis, and subcellular localization in transfected cells\",\n      \"pmids\": [\"16417584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ER-to-Golgi trafficking trigger not defined\", \"Regulation of protease access unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Knockout and Col1a1 promoter studies established the in vivo role of CREB3L1 in osteoblast collagen secretion and bone formation, linking BMP2 signaling to its proteolytic activation.\",\n      \"evidence\": \"OASIS-/- mice, promoter reporter, ChIP, histology, and BMP2 treatment\",\n      \"pmids\": [\"19767743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether bone phenotype is fully osteoblast-autonomous not yet resolved\", \"Other matrix targets not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Osteoblast-specific transgenic rescue separated the cell-autonomous bone phenotype from a systemic growth phenotype, refining where CREB3L1 acts in skeletal biology.\",\n      \"evidence\": \"Transgenic rescue under Col1a1 promoter, histology, RT-PCR, GH/IGF-1 ELISA in OASIS-/- mice\",\n      \"pmids\": [\"21047569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of the osteoblast-independent growth defect unresolved\", \"GH/IGF-1 regulatory link not mechanistically defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovering HRD1-mediated ubiquitination and its dissociation under ER stress explained how CREB3L1 abundance is gated, adding a degradation layer upstream of proteolytic activation.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination assays, HRD1 knockout cells, and stability assays\",\n      \"pmids\": [\"22705851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that disrupts HRD1 binding not defined\", \"Relative contribution of degradation vs RIP unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Knockout analyses extended CREB3L1 function to astrocyte and goblet-cell differentiation, identifying Gcm1 and epigenetic Gfap demethylation as a downstream differentiation axis.\",\n      \"evidence\": \"Oasis-/- mice, primary culture, Gcm1 rescue, Gfap promoter methylation, and goblet cell histology\",\n      \"pmids\": [\"22828627\", \"22262831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding of CREB3L1 to all differentiation targets not fully mapped\", \"Tissue specificity of target selection unexplained\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing virus-induced proteolytic activation and antiproliferative gene induction revealed CREB3L1 as an antiviral effector restricting host-cell proliferation needed for replication.\",\n      \"evidence\": \"Permissive/non-permissive cell comparison, viral infection, translocation imaging, knockdown and complementation\",\n      \"pmids\": [\"21767813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sensor linking infection to cleavage not identified\", \"Breadth of cell-cycle targets incomplete\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linking ceramide-driven cleavage to p21 induction connected a chemotherapy stress signal to CREB3L1-dependent cell-cycle arrest and drug sensitivity.\",\n      \"evidence\": \"Ceramide synthesis and cleavage assays, p21 reporter, knockdown and overexpression in cancer lines\",\n      \"pmids\": [\"23256041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ceramide promotes ER-to-Golgi trafficking unclear\", \"p53-independence not yet examined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying CREB3L1 as a metastasis suppressor and a direct VEGFA activator established opposing roles in tumor biology and angiogenesis, with direct CRE-like promoter binding.\",\n      \"evidence\": \"Overexpression, invasion/migration assays, rat mammary tumor model, ChIP-on-chip; VEGFA promoter ChIP and mutant reporters in ARPE-19 cells\",\n      \"pmids\": [\"24126059\", \"23383089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context determining suppressor vs promoter role unknown\", \"Direct angiogenic target set incompletely defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining the TGF-\\u03b2\\u2192TM4SF20\\u2192RIP\\u2192Smad4 axis and astrocyte ECM regulation showed how CREB3L1 partners with other factors to drive collagen and chondroitin sulfate matrix programs.\",\n      \"evidence\": \"TGF-\\u03b2 treatment, TM4SF20 manipulation, cleavage assay, CREB3L1\\u2013Smad4 Co-IP; C6ST1 reporter and neurite outgrowth assays in OASIS-/- mice; glycosylation mapping\",\n      \"pmids\": [\"25310401\", \"24716865\", \"23335989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of Smad4 cooperation across cell types unknown\", \"Functional role of Asn-513 glycosylation undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Hypothalamic and HIF-1\\u03b1 studies revealed neuroendocrine UPR control and a bZIP-mediated CREB3L1\\u2013HIF-1\\u03b1 partnership driving angiogenic transcription.\",\n      \"evidence\": \"Dominant-negative/shRNA in rat SON, UPR marker RT-PCR, forskolin/dexamethasone assays; CREB3L1\\u2013HIF-1\\u03b1 Co-IP, HRE reporters, metatarsal angiogenesis in Oasis-/- mice\",\n      \"pmids\": [\"25915053\", \"26503226\", \"26558437\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity for Chop/Xbp1U over other UPR genes unexplained\", \"Stoichiometry of CREB3L1\\u2013HIF-1\\u03b1 complex unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Knockdown in endometrial stromal cells placed CREB3L1 downstream of progesterone receptor signaling in decidualization, linking it to ERK1/2 activation.\",\n      \"evidence\": \"siRNA in hESCs, decidualization assay, ERK1/2 phosphorylation, PR knockout mouse\",\n      \"pmids\": [\"26917262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct decidualization targets not identified\", \"Mechanism connecting CREB3L1 to ERK unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"TSH-driven secretory-pathway expansion and PERK-dependent breast cancer invasion studies established CREB3L1 as a master regulator of Golgi/secretory capacity that can be co-opted to promote metastasis in specific tumor subtypes.\",\n      \"evidence\": \"Dominant-negative CREB3L1 with Golgi morphometry in thyroid cells; genetic/pharmacological CREB3L1 inhibition with PERK epistasis in TNBC models\",\n      \"pmids\": [\"29093023\", \"29057869\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transport-factor target genes only partially enumerated\", \"Determinants of pro- vs anti-tumor outcome unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Functional characterization of a bZIP missense variant (p.Ala304Val) and DNA-binding variants linked CREB3L1 loss-of-function to osteogenesis imperfecta through impaired collagen and SEC24D-dependent secretion.\",\n      \"evidence\": \"Structural modeling, luciferase assays, mutant overexpression, and SEC23A/SEC24D expression in patient-derived cells; exome sequencing\",\n      \"pmids\": [\"30657919\", \"28817112\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genotype\\u2013phenotype correlation across families incomplete\", \"Quantitative contribution of SEC24D loss to OI severity unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identifying Pcsk1 as a direct G-box target in the SON extended CREB3L1's neuroendocrine role to proprotein convertase expression.\",\n      \"evidence\": \"RNA-seq, promoter activity and binding assays, lentiviral overexpression/knockdown in rat SON\",\n      \"pmids\": [\"32319174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological consequence of Pcsk1 regulation not measured\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovering that full-length, uncleaved CREB3L1 accumulates at damaged nuclear envelopes revealed a transcription-independent function in nuclear envelope/DNA damage protection distinct from its UPR role.\",\n      \"evidence\": \"Live-cell and IF imaging of NE damage, colocalization with SUN2/Nesprin-2, DNA damage and nuclear deformation assays\",\n      \"pmids\": [\"34226518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of NE protection undefined\", \"How full-length form is selectively retained unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Thyroid cancer and decidualization studies clarified how CREB3L1 drives invasion via ECM/IL-1\\u03b1-mediated CAF activation (with KPNA2 as nuclear import factor) and how CREB3L1/CREB3L2 together sustain Golgi expansion and secretion.\",\n      \"evidence\": \"Knockdown/overexpression, cytokine array, scRNA-seq, zebrafish/mouse xenografts, co-culture; combined CREB3L1/CREB3L2 knockdown with Golgi and secretion assays\",\n      \"pmids\": [\"36192735\", \"36313580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy boundaries between CREB3L1 and CREB3L2 not fully mapped\", \"Direct IL-1\\u03b1 promoter regulation not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defining a cell-type-specific p21-dependent G2/M arrest and the C5a-PERK-ATF4-CREB3L1 calcification axis unified CREB3L1's roles in proliferation control and osteogenic transdifferentiation, with epigenetic reactivation suppressing glioblastoma growth.\",\n      \"evidence\": \"Oasis-/- mice, flow cytometry, p21 reporter, p53-null comparison, brain injury and CRISPR epigenomic xenograft models; VSMC calcification with C5aR1 antagonist\",\n      \"pmids\": [\"37178686\", \"37603848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of cell-type dominance of CREB3L1 vs p53 arrest unexplained\", \"Therapeutic window of epigenetic reactivation undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CREB3L1 trafficking, cleavage, and target selection are differentially tuned across cell types to produce opposite outcomes (tumor suppression vs promotion; transcriptional vs nuclear-envelope-protective roles) remains the central open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the activated bZIP fragment bound to DNA or HIF-1\\u03b1/Smad4\", \"Determinants of context-dependent function unknown\", \"Trigger for ER-to-Golgi translocation incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 5, 11, 13, 25]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 13, 23, 24, 25]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [5, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 11]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [2, 5, 15, 30]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 11, 13, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 9, 10]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 29]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [5, 15, 16, 27]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [23, 24]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HRD1\", \"SMAD4\", \"HIF1A\", \"TM4SF20\", \"SUN2\", \"SYNE2\", \"KPNA2\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}