{"gene":"CRTC1","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2005,"finding":"The MECT1 (CRTC1) N-terminal CREB-binding domain in the MECT1-MAML2 fusion protein binds directly to CREB, recruits p300/CBP into the CREB complex through a binding domain on MAML2, and constitutively activates CREB-dependent transcription; blocking CREB DNA binding markedly reduces the transforming activity of the fusion oncogene.","method":"Co-immunoprecipitation, reporter gene assays, dominant-negative CREB experiments, in vitro binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and functional mutagenesis with multiple orthogonal methods in a single rigorous study","pmids":["15961999"],"is_preprint":false},{"year":2009,"finding":"CRTC1 is required for activity-dependent CREB-target gene expression and dendritic growth in developing cortical neurons; Ca2+ influx via voltage-gated calcium channels induces CRTC1 dephosphorylation and calcineurin-dependent nuclear translocation, which initiates CREB-target gene transcription including SIK1; SIK1 then promotes CRTC1 rephosphorylation as a negative feedback mechanism.","method":"Live-cell imaging of nuclear translocation, pharmacological inhibitors (calcineurin, calcium channels), dominant-negative and shRNA knockdown of CRTC1, in vivo and in vitro dendritic growth assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (imaging, KD, KO, pharmacology) with clear mechanistic pathway placement","pmids":["19244510"],"is_preprint":false},{"year":2006,"finding":"CRTC1 (TORC1) undergoes neuronal activity-induced translocation from cytoplasm to nucleus, a process required for CRE-dependent gene expression and late-phase LTP; overexpressing dominant-negative CRTC1 suppressed L-LTP maintenance without affecting E-LTP, while wild-type CRTC1 overexpression facilitated L-LTP induction in hippocampal slices.","method":"Subcellular fractionation and live imaging of CRTC1 translocation, dominant-negative overexpression, shRNA knockdown, LTP electrophysiology in hippocampal slices, CRE-luciferase reporter assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — clean KD/DN experiments with specific synaptic plasticity readout and direct localization experiments","pmids":["17183642"],"is_preprint":false},{"year":2009,"finding":"CRTC1 functions as an indispensable modulator of AP-1 transcription: after TPA stimulation, CRTC1 is recruited to AP-1 target gene promoters and associates with c-Jun and c-Fos; CRTC1 synergizes with c-Jun to promote cellular growth, and CRTC1-deficient cells cannot undergo AP-1-dependent proliferation. The CRTC1-MAML2 oncoprotein binds and activates both c-Jun and c-Fos, and AP-1 ablation disrupts CRTC1-MAML2-driven transformation.","method":"Chromatin immunoprecipitation, Co-IP, reporter gene assays, CRTC1 knockout cells, colony formation assays","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — ChIP, reciprocal Co-IP, and KO cells with multiple functional readouts","pmids":["19164581"],"is_preprint":false},{"year":2010,"finding":"Beta-amyloid (Abeta) suppresses CRTC1-dependent gene transcription by reducing calcium influx through L-type VGCCs, thereby disrupting PP2B/calcineurin-dependent CRTC1 dephosphorylation at Ser151; expression of constitutively active CRTC1 S151A or calcineurin mutants rescues CRTC1 transcriptional activity in APP(Sw,Ind) neurons, and CRTC1-dependent memory genes (Bdnf, c-fos, Nr4a2) are selectively reduced.","method":"Phospho-specific immunoblotting, pharmacological channel blockers/agonists, dominant-negative and constitutively active CRTC1 mutants, gene expression profiling, behavioral memory tests in transgenic mice","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — site-specific mutagenesis, pharmacological rescue, and in vivo transgenic model with multiple orthogonal readouts","pmids":["20631169"],"is_preprint":false},{"year":2010,"finding":"CRTC1 nuclear localization is enhanced in LKB1-null lung cancer cells; somatic loss of LKB1 is associated with underphosphorylation of endogenous CRTC1 and increased expression of the CRTC1 target gene NR4A2/Nurr1; inhibition of NR4A2 suppresses growth of LKB1-null but not LKB1-wildtype tumors.","method":"Immunoblotting for CRTC1 phosphorylation status, subcellular fractionation/immunofluorescence, siRNA knockdown of NR4A2, growth assays in LKB1-null vs wildtype cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional consequence, but single lab study","pmids":["20010869"],"is_preprint":false},{"year":2010,"finding":"BDNF-induced dendritic growth requires a functional CREB-CRTC1 interaction; NMDA receptor activation by glutamate drives CRTC1 nuclear translocation via calcineurin, and this translocation is essential for BDNF's effects on dendritic length and complexity. shRNA knockdown of CRTC1 abolishes BDNF-induced dendritic growth of cortical neurons.","method":"Dominant-negative CREB mutant (unable to bind CRTC1), shRNA knockdown of CRTC1, live-cell imaging, pharmacological NMDA receptor blockade, dendritic morphology analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (DN mutants, shRNA, pharmacology, imaging) with specific morphological readout","pmids":["20639200"],"is_preprint":false},{"year":2013,"finding":"In the suprachiasmatic nucleus (SCN), a photic entrainment stimulus causes CRTC1 to coactivate CREB, inducing expression of Per1 and Sik1; SIK1 then phosphorylates and deactivates CRTC1, providing negative feedback that limits further clock shifts. Knockdown of Sik1 in the SCN results in increased behavioral phase shifts and rapid re-entrainment after jet lag.","method":"In vivo SCN-targeted knockdown (lentiviral shRNA), behavioral wheel-running assays, immunofluorescence for CRTC1 nuclear localization, gene expression analysis (Per1, Sik1)","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — in vivo SCN knockdown with direct behavioral readout, pathway placement established by epistasis and molecular imaging","pmids":["23993098"],"is_preprint":false},{"year":2013,"finding":"In the SCN, CRTC1 shows rhythmic nuclear expression peaking at mid-subjective day, and light pulses during early and late subjective night induce strong nuclear accumulation of CRTC1 specifically (CRTC2 is unaffected by light). ChIP analysis confirmed CRTC1 association with CREB at the Period1 gene 5' regulatory region; CRTC1 overexpression markedly upregulates Period1 transcription.","method":"Immunohistochemistry with subcellular localization scoring, chromatin immunoprecipitation (ChIP), CRE-luciferase reporter assays, immunofluorescence","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — ChIP and reporter assays combined with direct localization imaging in a defined in vivo context","pmids":["23699513"],"is_preprint":false},{"year":2014,"finding":"CRTC1 nuclear translocation is controlled by convergent constitutive kinase pathways and the activity-regulated phosphatase calcineurin; nuclear CRTC1 triggers activity-dependent association with CREB at IEG promoters. During contextual fear conditioning, endogenous CRTC1 nuclear recruitment occurs in the basolateral amygdala but not hippocampus; CRTC1 knockdown in amygdala (not hippocampus) attenuates fear memory.","method":"Constitutively nuclear CRTC1 lentiviral expression, shRNA knockdown in specific brain regions, in vivo fear conditioning behavioral assay, ChIP for CRTC1 at IEG promoters, live-cell imaging of CRTC1 translocation","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — region-specific KD, ChIP, behavioral assays, and direct imaging provide strong convergent evidence","pmids":["25277455"],"is_preprint":false},{"year":2006,"finding":"Sustained expression of MECT1-MAML2 (CRTC1-MAML2) is required for tumor cell growth in MEC salivary gland cancer cells carrying the t(11;19) translocation; RNAi-mediated knockdown of the fusion peptide caused ≥90% colony growth inhibition in MEC lines, which was rescued by a mutant MAML2 construct resistant to RNAi.","method":"RNAi hairpin knockdown, colony formation assay, in vivo xenograft assay in nude mice, rescue experiment with RNAi-resistant construct","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — clean KD with specific functional readout and RNAi-rescue experiment confirming on-target effect","pmids":["16652146"],"is_preprint":false},{"year":2014,"finding":"CRTC1-MAML2 fusion oncoprotein interacts with MYC proteins and activates MYC transcription targets including genes involved in cell growth, metabolism, and survival; the CRTC1-MAML2–MYC interaction is necessary for CRTC1-MAML2-driven cell transformation.","method":"Co-immunoprecipitation, gene expression profiling, loss-of-function experiments disrupting the C1/M2-MYC interface, transformation assay in human MEC cells","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — Co-IP with functional validation of the interaction's necessity for transformation","pmids":["25071166"],"is_preprint":false},{"year":2018,"finding":"CRTC1-MAML2 induces transcription of lncRNA LINC00473, which is dependent on CRTC1-MAML2's ability to activate CREB-mediated transcription; LINC00473 in turn binds NONO (a cAMP signaling component) to enhance CRTC1-MAML2-driven CREB-mediated transcription, forming a feed-forward loop essential for MEC cell growth.","method":"Gene expression profiling after CRTC1-MAML2 depletion, RNAi knockdown of LINC00473, xenograft tumor growth assays, RNA pulldown/Co-IP of LINC00473 with NONO, RNA-ISH for subcellular localization","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including RNA pulldown, KD, and in vivo xenograft with rescue experiments","pmids":["29353885"],"is_preprint":false},{"year":2014,"finding":"CRTC1 is required for HBV transcription and replication; CRTC1 interacts with CREB and they are mutually required for recruitment to the preS2/S promoter on cccDNA. HBV transactivator HBx stabilizes CRTC1 protein and promotes its transcriptional activity on HBV.","method":"Co-immunoprecipitation, ChIP on cccDNA, dominant-negative CRTC1, ectopic overexpression, siRNA knockdown, HBsAg/pgRNA/cccDNA level measurement","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — ChIP, Co-IP, and multiple functional assays with both gain- and loss-of-function","pmids":["25300488"],"is_preprint":false},{"year":2019,"finding":"SIK1 phosphorylates CRTC1, preventing CRTC1 from enhancing CREB transcriptional activity for osteogenic gene expression (including Id1); SIK1 knockdown in preosteoblasts increased osteoblast differentiation, and SIK1 KO mice show higher bone mass. BMP2 suppresses SIK1 expression and activity via PKA-dependent mechanisms to stimulate osteogenesis.","method":"Gene knockdown (siRNA for SIK1/2/3), SIK1 KO mice with bone histomorphometry, kinase activity assay, reporter gene assay for CREB/CRTC1 activity, Western blotting for CRTC1 phosphorylation","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — KO mouse model with bone phenotype, kinase assay, and mechanistic pathway placement","pmids":["31672960"],"is_preprint":false},{"year":2019,"finding":"CRTC1 nuclear import is mediated by the importin KPNA1 (Importin-α5), which escorts CRTC1 as cargo across the nuclear envelope; DACE blocks CRTC1 nuclear import, thereby inhibiting CREB/CRTC1-driven SOX10 induction and MITF-M transcription to suppress melanogenesis.","method":"Co-immunoprecipitation of CRTC1 with KPNA1, siRNA knockdown, immunofluorescence of CRTC1 nuclear localization, chromatin immunoprecipitation, RT-PCR","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP identifies importin, with functional localization consequence; single lab study","pmids":["30809299"],"is_preprint":false},{"year":2021,"finding":"LTD-inducing stimuli specifically dephosphorylate CRTC1 at Ser-151 and recruit CRTC1 from cytoplasm to nucleus, where it competes with FXR for binding to CREB and drives autophagy gene expression required for NMDAR-dependent late-phase LTD; disrupting CREB-CRTC1 synergistic actions impairs transcription-dependent autophagy and prevents L-LTD.","method":"Phospho-specific immunoblotting for CRTC1 Ser-151, live-cell imaging of CRTC1 nuclear translocation, dominant-negative constructs, Co-IP of CRTC1/CREB/FXR, autophagy assays, electrophysiological LTD recording","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches (imaging, phospho-blotting, Co-IP, electrophysiology) with clear mechanistic and functional pathway placement","pmids":["34289350"],"is_preprint":false},{"year":2014,"finding":"Excitatory GABA-induced BDNF transcription via promoter IV requires the combination of nuclear-localized CRTC1 (via calcineurin pathway) and CREB phosphorylation; CRTC1 nuclear translocation in cortical neurons is specifically induced by GABA via Ca2+/calcineurin signaling.","method":"Dominant-negative CREB overexpression, CRTC1 nuclear translocation imaging, pharmacological inhibitors (calcineurin, CaMK, MAPK), Bdnf-promoter IV-luciferase reporter, mRNA quantification","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, multiple methods but primarily pharmacological with reporter assays","pmids":["24965890"],"is_preprint":false},{"year":2007,"finding":"The CRTC1-MAML2 gene fusion is found in benign hidradenomas of the skin (50% of cases), all of which show clear cell morphology, indicating the fusion oncogene has transforming activity beyond salivary gland tumors and is associated with clear cell differentiation across exocrine glands.","method":"FISH (CRTC1 and MAML2 loci), RT-PCR for fusion transcript, immunohistochemistry for fusion protein expression in tumor cells","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 3 — molecular detection methods (FISH/RT-PCR/IHC) establish fusion presence and expression but mechanism inferred from prior studies","pmids":["17334997"],"is_preprint":false},{"year":2022,"finding":"miR-184-3p directly targets CRTC1 mRNA 3'UTR; reduced miR-184-3p leads to CRTC1 upregulation in β-cells, which protects against lipotoxicity- and inflammation-induced apoptosis; silencing CRTC1 abrogates the protective effect of miR-184-3p inhibition. NKX6.1 directly controls miR-184 expression via its DNA-binding sites in the MIR184 promoter.","method":"miR-184-3p mimic/inhibitor experiments, siRNA knockdown of CRTC1, chromatin immunoprecipitation for NKX6.1 at MIR184 promoter, apoptosis assays, mRNA/protein quantification","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and functional rescue/knockdown experiments; single lab","pmids":["35906204"],"is_preprint":false}],"current_model":"CRTC1 is a CREB transcriptional coactivator that is maintained in an inactive, cytoplasmic state by SIK-family kinase-mediated phosphorylation (at Ser151 and related sites), and is activated by calcineurin/PP2B-dependent dephosphorylation downstream of Ca2+ influx and cAMP signals, causing its nuclear translocation where it directly binds CREB, recruits co-activators (p300/CBP), and drives transcription of target genes (including Per1, BDNF, NR4A2, and autophagy genes) important for circadian entrainment, synaptic plasticity, memory, dendritic growth, bone anabolism, and melanogenesis; its N-terminal CREB-binding domain is hijacked in the oncogenic CRTC1-MAML2 fusion, which constitutively activates CREB-, AP-1-, Notch-, and MYC-dependent transcription to drive mucoepidermoid carcinoma."},"narrative":{"teleology":[{"year":2005,"claim":"Establishing that the CRTC1 N-terminus directly binds CREB and that this interaction is essential for the transforming activity of the CRTC1-MAML2 fusion provided the first molecular framework for CRTC1 as a CREB coactivator and explained how the t(11;19) translocation drives mucoepidermoid carcinoma.","evidence":"Co-IP, in vitro binding, reporter assays, and dominant-negative CREB experiments in MEC-derived cells","pmids":["15961999"],"confidence":"High","gaps":["No structural detail of the CRTC1–CREB interface","Wild-type CRTC1 coactivator function in normal cells not yet tested"]},{"year":2006,"claim":"Demonstrating that neuronal activity drives CRTC1 nuclear translocation and that this is required specifically for late-phase LTP (but not early LTP) established CRTC1 as a gating coactivator for transcription-dependent synaptic plasticity.","evidence":"Subcellular fractionation, live imaging, dominant-negative and shRNA experiments with LTP electrophysiology in hippocampal slices","pmids":["17183642"],"confidence":"High","gaps":["Upstream kinase/phosphatase cascade not yet identified","In vivo behavioral relevance not tested"]},{"year":2006,"claim":"Showing that sustained CRTC1-MAML2 expression is required for tumor cell survival confirmed the fusion as an oncogenic driver rather than a passenger, validating it as a therapeutic target in MEC.","evidence":"RNAi knockdown with rescue by RNAi-resistant construct, colony formation and xenograft assays","pmids":["16652146"],"confidence":"High","gaps":["Downstream effector pathways of the fusion not yet dissected"]},{"year":2009,"claim":"Identifying calcineurin-dependent dephosphorylation and calcium channel-gated nuclear import of CRTC1, together with SIK1 as a CRTC1/CREB target gene that rephosphorylates CRTC1, defined the core activation–feedback circuit controlling CRTC1 in neurons.","evidence":"Live-cell imaging, pharmacological inhibitors (calcineurin, L-type VGCC), shRNA knockdown, dendritic growth assays in cortical neurons","pmids":["19244510"],"confidence":"High","gaps":["Specific phosphorylation sites involved not mapped in this study","Whether SIK1 directly phosphorylates CRTC1 in neurons or acts via intermediates not resolved"]},{"year":2009,"claim":"Discovering that CRTC1 is recruited to AP-1 target promoters and physically associates with c-Jun/c-Fos expanded CRTC1 function beyond CREB to AP-1-dependent transcription, and showed AP-1 is essential for CRTC1-MAML2-driven transformation.","evidence":"ChIP, reciprocal Co-IP, CRTC1 knockout cells, colony formation assays","pmids":["19164581"],"confidence":"High","gaps":["Whether CRTC1 coactivates AP-1 in normal (non-oncogenic) physiology not resolved","Structural basis of CRTC1–AP-1 interaction unknown"]},{"year":2010,"claim":"Showing that β-amyloid suppresses CRTC1 function by reducing L-type VGCC calcium influx and blocking calcineurin-dependent Ser151 dephosphorylation, with rescue by CRTC1-S151A, identified CRTC1 dysfunction as a mechanism linking Aβ to transcriptional and memory deficits in Alzheimer's disease models.","evidence":"Phospho-specific immunoblotting, constitutively active CRTC1 mutant rescue, gene expression profiling, behavioral memory tests in APP(Sw,Ind) transgenic mice","pmids":["20631169"],"confidence":"High","gaps":["Whether restoring CRTC1 activity rescues cognitive deficits in vivo not fully demonstrated","Contribution of other TORCs in AD not assessed"]},{"year":2010,"claim":"Identifying that LKB1 loss derepresses CRTC1 nuclear localization and CRTC1-dependent NR4A2 expression linked the LKB1-SIK-CRTC1 axis to lung cancer cell growth, extending CRTC1's oncogenic relevance beyond the fusion context.","evidence":"Immunoblotting, subcellular fractionation, siRNA knockdown of NR4A2, growth assays in LKB1-null vs. wildtype cells","pmids":["20010869"],"confidence":"Medium","gaps":["Single-lab study","Whether CRTC1 itself is required for LKB1-null tumor growth not directly tested"]},{"year":2013,"claim":"Establishing that light-induced CRTC1 nuclear translocation in the SCN activates Per1 and Sik1, and that SIK1 feedback limits circadian phase-shifting, placed CRTC1 at the core of the photic entrainment pathway and explained behavioral gating of jet-lag recovery.","evidence":"In vivo SCN-targeted shRNA knockdown, behavioral wheel-running assays, ChIP of CRTC1 at Per1, immunohistochemistry for rhythmic CRTC1 nuclear expression","pmids":["23993098","23699513"],"confidence":"High","gaps":["Whether CRTC1 knockout animals show circadian phenotypes not tested","Kinetics of CRTC1 dephosphorylation after photic stimulus not resolved"]},{"year":2014,"claim":"Region-specific in vivo knockdown showing CRTC1 is required in the basolateral amygdala but not hippocampus for fear memory, combined with ChIP at IEG promoters, established brain-region selectivity of CRTC1-dependent memory encoding.","evidence":"Lentiviral shRNA in specific brain regions, fear conditioning behavior, ChIP for CRTC1 at IEG promoters","pmids":["25277455"],"confidence":"High","gaps":["Mechanism of region-specific CRTC1 engagement not explained","Whether CRTC1 is required for other amygdala-dependent behaviors not tested"]},{"year":2014,"claim":"Identifying that CRTC1-MAML2 interacts with MYC proteins and that this interaction is necessary for transformation added MYC as a third major transcription factor axis co-opted by the fusion oncoprotein.","evidence":"Co-IP, gene expression profiling, loss-of-function disrupting C1/M2-MYC interface, transformation assays in MEC cells","pmids":["25071166"],"confidence":"High","gaps":["Whether wild-type CRTC1 interacts with MYC in normal cells not tested","Structural basis of CRTC1-MAML2–MYC interaction unknown"]},{"year":2014,"claim":"Showing CRTC1 is recruited to HBV cccDNA at the preS2/S promoter with CREB, and that HBx stabilizes CRTC1 protein, revealed viral exploitation of host CRTC1 coactivator activity for HBV transcription.","evidence":"ChIP on cccDNA, Co-IP, siRNA knockdown, dominant-negative CRTC1, HBsAg/pgRNA quantification","pmids":["25300488"],"confidence":"High","gaps":["Whether targeting CRTC1 reduces HBV in vivo not tested","Mechanism by which HBx stabilizes CRTC1 not defined"]},{"year":2018,"claim":"Identifying LINC00473 as a CRTC1-MAML2-induced lncRNA that binds NONO to feed back and amplify CREB-dependent transcription revealed a lncRNA-mediated feed-forward loop in the fusion's oncogenic program.","evidence":"Gene expression profiling, RNAi of LINC00473, RNA pulldown/Co-IP with NONO, xenograft tumor growth assays","pmids":["29353885"],"confidence":"High","gaps":["Whether LINC00473 has a role downstream of wild-type CRTC1 not tested","Structural basis of LINC00473–NONO interaction unknown"]},{"year":2019,"claim":"Identifying KPNA1 (Importin-α5) as the nuclear import receptor for CRTC1 provided the first mechanistic detail of how dephosphorylated CRTC1 gains nuclear access.","evidence":"Co-IP of CRTC1 with KPNA1, siRNA knockdown, immunofluorescence of CRTC1 localization, ChIP","pmids":["30809299"],"confidence":"Medium","gaps":["Single-lab study","NLS on CRTC1 recognized by KPNA1 not mapped","Whether other importins contribute not tested"]},{"year":2019,"claim":"Demonstrating that SIK1 phosphorylates CRTC1 to suppress CREB-driven osteogenic gene expression, and that SIK1 KO mice have increased bone mass, extended the SIK-CRTC1 axis to bone anabolism.","evidence":"SIK1 KO mice with bone histomorphometry, kinase activity assay, reporter assays, CRTC1 phosphorylation immunoblotting","pmids":["31672960"],"confidence":"High","gaps":["Whether bone phenotype is mediated specifically through CRTC1 vs. CRTC2/3 not resolved"]},{"year":2021,"claim":"Showing that LTD stimuli specifically dephosphorylate CRTC1-Ser151 to drive autophagy gene expression required for late-phase LTD, and that CRTC1 competes with FXR for CREB binding, expanded CRTC1 function to depression-type synaptic plasticity and autophagy.","evidence":"Phospho-Ser151 immunoblotting, live imaging, Co-IP of CRTC1/CREB/FXR, autophagy assays, electrophysiological LTD recording","pmids":["34289350"],"confidence":"High","gaps":["In vivo behavioral consequence of CRTC1-dependent autophagy in LTD not tested","Mechanism of CRTC1–FXR competition not structurally characterized"]},{"year":null,"claim":"No high-resolution structure of the CRTC1–CREB complex exists, and the precise NLS/phosphodegron switching mechanism, the full spectrum of CRTC1-dependent transcriptional targets across tissues, and the in vivo consequences of CRTC1 genetic ablation in adult brain remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of CRTC1 or CRTC1–CREB complex","Full-body Crtc1 knockout phenotype in adult conditional models not reported in timeline","Relative contributions of CRTC1 vs. CRTC2/CRTC3 in overlapping tissues not systematically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,3,7,8,9,13,16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,6,15]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2,4,16]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,7,8,9,15,16]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3,7,8,9,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,4,6,14,17]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,4,9,16]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[7,8]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,11,12]}],"complexes":[],"partners":["CREB1","SIK1","KPNA1","MAML2","FXR","NONO","JUN"],"other_free_text":[]},"mechanistic_narrative":"CRTC1 is a signal-regulated transcriptional coactivator that integrates calcium and cAMP inputs to drive CREB-dependent and AP-1-dependent gene expression programs essential for synaptic plasticity, circadian entrainment, dendritic morphogenesis, and other processes. In its basal state, CRTC1 is retained in the cytoplasm by SIK-family kinase-mediated phosphorylation at Ser151; calcium influx through L-type VGCCs or NMDA receptors activates calcineurin/PP2B, which dephosphorylates CRTC1 and triggers its KPNA1-dependent nuclear import, where it binds CREB at target promoters (Per1, Bdnf, Nr4a2, autophagy genes) and recruits p300/CBP to activate transcription [PMID:19244510, PMID:20631169, PMID:25277455, PMID:30809299]. SIK1 itself is a CRTC1/CREB target gene that rephosphorylates CRTC1, establishing a negative feedback loop that gates circadian phase-shifting in the suprachiasmatic nucleus and limits transcriptional responses in neurons [PMID:23993098, PMID:31672960]. The CRTC1 N-terminal CREB-binding domain is recurrently hijacked in the CRTC1-MAML2 fusion oncoprotein, which constitutively activates CREB, AP-1, MYC, and downstream lncRNA (LINC00473) transcriptional programs to drive mucoepidermoid carcinoma and skin hidradenoma [PMID:15961999, PMID:19164581, PMID:25071166, PMID:29353885]."},"prefetch_data":{"uniprot":{"accession":"Q6UUV9","full_name":"CREB-regulated transcription coactivator 1","aliases":["Mucoepidermoid carcinoma translocated protein 1","Transducer of regulated cAMP response element-binding protein 1","TORC-1","Transducer of CREB protein 1"],"length_aa":634,"mass_kda":67.3,"function":"Transcriptional coactivator for CREB1 which activates transcription through both consensus and variant cAMP response element (CRE) sites. Acts as a coactivator, in the SIK/TORC signaling pathway, being active when dephosphorylated and acts independently of CREB1 'Ser-133' phosphorylation. Enhances the interaction of CREB1 with TAF4. Regulates the expression of specific CREB-activated genes such as the steroidogenic gene, StAR. Potent coactivator of PGC1alpha and inducer of mitochondrial biogenesis in muscle cells. In the hippocampus, involved in late-phase long-term potentiation (L-LTP) maintenance at the Schaffer collateral-CA1 synapses. May be required for dendritic growth of developing cortical neurons (By similarity). In concert with SIK1, regulates the light-induced entrainment of the circadian clock. In response to light stimulus, coactivates the CREB-mediated transcription of PER1 which plays an important role in the photic entrainment of the circadian clock (Microbial infection) Plays a role of coactivator for TAX activation of the human T-cell leukemia virus type 1 (HTLV-1) long terminal repeats (LTR)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q6UUV9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CRTC1","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CRTC1","total_profiled":1310},"omim":[{"mim_id":"616499","title":"TRANSMEMBRANE PROTEIN 203; 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additional cases with review of the literature of an emerging entity.","date":"2021","source":"Journal of cutaneous pathology","url":"https://pubmed.ncbi.nlm.nih.gov/33586183","citation_count":21,"is_preprint":false},{"pmid":"28613034","id":"PMC_28613034","title":"TORC1-mediated sensing of chaperone activity alters glucose metabolism and extends lifespan.","date":"2017","source":"Aging cell","url":"https://pubmed.ncbi.nlm.nih.gov/28613034","citation_count":21,"is_preprint":false},{"pmid":"31038844","id":"PMC_31038844","title":"Eisosomes at the intersection of TORC1 and TORC2 regulation.","date":"2019","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/31038844","citation_count":20,"is_preprint":false},{"pmid":"34680122","id":"PMC_34680122","title":"Pib2 as an Emerging Master Regulator of Yeast 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communications","url":"https://pubmed.ncbi.nlm.nih.gov/29787763","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47422,"output_tokens":5484,"usd":0.112263},"stage2":{"model":"claude-opus-4-6","input_tokens":8982,"output_tokens":4073,"usd":0.220103},"total_usd":0.332366,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"The MECT1 (CRTC1) N-terminal CREB-binding domain in the MECT1-MAML2 fusion protein binds directly to CREB, recruits p300/CBP into the CREB complex through a binding domain on MAML2, and constitutively activates CREB-dependent transcription; blocking CREB DNA binding markedly reduces the transforming activity of the fusion oncogene.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays, dominant-negative CREB experiments, in vitro binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and functional mutagenesis with multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"15961999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CRTC1 is required for activity-dependent CREB-target gene expression and dendritic growth in developing cortical neurons; Ca2+ influx via voltage-gated calcium channels induces CRTC1 dephosphorylation and calcineurin-dependent nuclear translocation, which initiates CREB-target gene transcription including SIK1; SIK1 then promotes CRTC1 rephosphorylation as a negative feedback mechanism.\",\n      \"method\": \"Live-cell imaging of nuclear translocation, pharmacological inhibitors (calcineurin, calcium channels), dominant-negative and shRNA knockdown of CRTC1, in vivo and in vitro dendritic growth assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (imaging, KD, KO, pharmacology) with clear mechanistic pathway placement\",\n      \"pmids\": [\"19244510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CRTC1 (TORC1) undergoes neuronal activity-induced translocation from cytoplasm to nucleus, a process required for CRE-dependent gene expression and late-phase LTP; overexpressing dominant-negative CRTC1 suppressed L-LTP maintenance without affecting E-LTP, while wild-type CRTC1 overexpression facilitated L-LTP induction in hippocampal slices.\",\n      \"method\": \"Subcellular fractionation and live imaging of CRTC1 translocation, dominant-negative overexpression, shRNA knockdown, LTP electrophysiology in hippocampal slices, CRE-luciferase reporter assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/DN experiments with specific synaptic plasticity readout and direct localization experiments\",\n      \"pmids\": [\"17183642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CRTC1 functions as an indispensable modulator of AP-1 transcription: after TPA stimulation, CRTC1 is recruited to AP-1 target gene promoters and associates with c-Jun and c-Fos; CRTC1 synergizes with c-Jun to promote cellular growth, and CRTC1-deficient cells cannot undergo AP-1-dependent proliferation. The CRTC1-MAML2 oncoprotein binds and activates both c-Jun and c-Fos, and AP-1 ablation disrupts CRTC1-MAML2-driven transformation.\",\n      \"method\": \"Chromatin immunoprecipitation, Co-IP, reporter gene assays, CRTC1 knockout cells, colony formation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, reciprocal Co-IP, and KO cells with multiple functional readouts\",\n      \"pmids\": [\"19164581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Beta-amyloid (Abeta) suppresses CRTC1-dependent gene transcription by reducing calcium influx through L-type VGCCs, thereby disrupting PP2B/calcineurin-dependent CRTC1 dephosphorylation at Ser151; expression of constitutively active CRTC1 S151A or calcineurin mutants rescues CRTC1 transcriptional activity in APP(Sw,Ind) neurons, and CRTC1-dependent memory genes (Bdnf, c-fos, Nr4a2) are selectively reduced.\",\n      \"method\": \"Phospho-specific immunoblotting, pharmacological channel blockers/agonists, dominant-negative and constitutively active CRTC1 mutants, gene expression profiling, behavioral memory tests in transgenic mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — site-specific mutagenesis, pharmacological rescue, and in vivo transgenic model with multiple orthogonal readouts\",\n      \"pmids\": [\"20631169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CRTC1 nuclear localization is enhanced in LKB1-null lung cancer cells; somatic loss of LKB1 is associated with underphosphorylation of endogenous CRTC1 and increased expression of the CRTC1 target gene NR4A2/Nurr1; inhibition of NR4A2 suppresses growth of LKB1-null but not LKB1-wildtype tumors.\",\n      \"method\": \"Immunoblotting for CRTC1 phosphorylation status, subcellular fractionation/immunofluorescence, siRNA knockdown of NR4A2, growth assays in LKB1-null vs wildtype cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence, but single lab study\",\n      \"pmids\": [\"20010869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BDNF-induced dendritic growth requires a functional CREB-CRTC1 interaction; NMDA receptor activation by glutamate drives CRTC1 nuclear translocation via calcineurin, and this translocation is essential for BDNF's effects on dendritic length and complexity. shRNA knockdown of CRTC1 abolishes BDNF-induced dendritic growth of cortical neurons.\",\n      \"method\": \"Dominant-negative CREB mutant (unable to bind CRTC1), shRNA knockdown of CRTC1, live-cell imaging, pharmacological NMDA receptor blockade, dendritic morphology analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (DN mutants, shRNA, pharmacology, imaging) with specific morphological readout\",\n      \"pmids\": [\"20639200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In the suprachiasmatic nucleus (SCN), a photic entrainment stimulus causes CRTC1 to coactivate CREB, inducing expression of Per1 and Sik1; SIK1 then phosphorylates and deactivates CRTC1, providing negative feedback that limits further clock shifts. Knockdown of Sik1 in the SCN results in increased behavioral phase shifts and rapid re-entrainment after jet lag.\",\n      \"method\": \"In vivo SCN-targeted knockdown (lentiviral shRNA), behavioral wheel-running assays, immunofluorescence for CRTC1 nuclear localization, gene expression analysis (Per1, Sik1)\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo SCN knockdown with direct behavioral readout, pathway placement established by epistasis and molecular imaging\",\n      \"pmids\": [\"23993098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In the SCN, CRTC1 shows rhythmic nuclear expression peaking at mid-subjective day, and light pulses during early and late subjective night induce strong nuclear accumulation of CRTC1 specifically (CRTC2 is unaffected by light). ChIP analysis confirmed CRTC1 association with CREB at the Period1 gene 5' regulatory region; CRTC1 overexpression markedly upregulates Period1 transcription.\",\n      \"method\": \"Immunohistochemistry with subcellular localization scoring, chromatin immunoprecipitation (ChIP), CRE-luciferase reporter assays, immunofluorescence\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assays combined with direct localization imaging in a defined in vivo context\",\n      \"pmids\": [\"23699513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CRTC1 nuclear translocation is controlled by convergent constitutive kinase pathways and the activity-regulated phosphatase calcineurin; nuclear CRTC1 triggers activity-dependent association with CREB at IEG promoters. During contextual fear conditioning, endogenous CRTC1 nuclear recruitment occurs in the basolateral amygdala but not hippocampus; CRTC1 knockdown in amygdala (not hippocampus) attenuates fear memory.\",\n      \"method\": \"Constitutively nuclear CRTC1 lentiviral expression, shRNA knockdown in specific brain regions, in vivo fear conditioning behavioral assay, ChIP for CRTC1 at IEG promoters, live-cell imaging of CRTC1 translocation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — region-specific KD, ChIP, behavioral assays, and direct imaging provide strong convergent evidence\",\n      \"pmids\": [\"25277455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Sustained expression of MECT1-MAML2 (CRTC1-MAML2) is required for tumor cell growth in MEC salivary gland cancer cells carrying the t(11;19) translocation; RNAi-mediated knockdown of the fusion peptide caused ≥90% colony growth inhibition in MEC lines, which was rescued by a mutant MAML2 construct resistant to RNAi.\",\n      \"method\": \"RNAi hairpin knockdown, colony formation assay, in vivo xenograft assay in nude mice, rescue experiment with RNAi-resistant construct\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with specific functional readout and RNAi-rescue experiment confirming on-target effect\",\n      \"pmids\": [\"16652146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CRTC1-MAML2 fusion oncoprotein interacts with MYC proteins and activates MYC transcription targets including genes involved in cell growth, metabolism, and survival; the CRTC1-MAML2–MYC interaction is necessary for CRTC1-MAML2-driven cell transformation.\",\n      \"method\": \"Co-immunoprecipitation, gene expression profiling, loss-of-function experiments disrupting the C1/M2-MYC interface, transformation assay in human MEC cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with functional validation of the interaction's necessity for transformation\",\n      \"pmids\": [\"25071166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRTC1-MAML2 induces transcription of lncRNA LINC00473, which is dependent on CRTC1-MAML2's ability to activate CREB-mediated transcription; LINC00473 in turn binds NONO (a cAMP signaling component) to enhance CRTC1-MAML2-driven CREB-mediated transcription, forming a feed-forward loop essential for MEC cell growth.\",\n      \"method\": \"Gene expression profiling after CRTC1-MAML2 depletion, RNAi knockdown of LINC00473, xenograft tumor growth assays, RNA pulldown/Co-IP of LINC00473 with NONO, RNA-ISH for subcellular localization\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including RNA pulldown, KD, and in vivo xenograft with rescue experiments\",\n      \"pmids\": [\"29353885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CRTC1 is required for HBV transcription and replication; CRTC1 interacts with CREB and they are mutually required for recruitment to the preS2/S promoter on cccDNA. HBV transactivator HBx stabilizes CRTC1 protein and promotes its transcriptional activity on HBV.\",\n      \"method\": \"Co-immunoprecipitation, ChIP on cccDNA, dominant-negative CRTC1, ectopic overexpression, siRNA knockdown, HBsAg/pgRNA/cccDNA level measurement\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, Co-IP, and multiple functional assays with both gain- and loss-of-function\",\n      \"pmids\": [\"25300488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIK1 phosphorylates CRTC1, preventing CRTC1 from enhancing CREB transcriptional activity for osteogenic gene expression (including Id1); SIK1 knockdown in preosteoblasts increased osteoblast differentiation, and SIK1 KO mice show higher bone mass. BMP2 suppresses SIK1 expression and activity via PKA-dependent mechanisms to stimulate osteogenesis.\",\n      \"method\": \"Gene knockdown (siRNA for SIK1/2/3), SIK1 KO mice with bone histomorphometry, kinase activity assay, reporter gene assay for CREB/CRTC1 activity, Western blotting for CRTC1 phosphorylation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse model with bone phenotype, kinase assay, and mechanistic pathway placement\",\n      \"pmids\": [\"31672960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRTC1 nuclear import is mediated by the importin KPNA1 (Importin-α5), which escorts CRTC1 as cargo across the nuclear envelope; DACE blocks CRTC1 nuclear import, thereby inhibiting CREB/CRTC1-driven SOX10 induction and MITF-M transcription to suppress melanogenesis.\",\n      \"method\": \"Co-immunoprecipitation of CRTC1 with KPNA1, siRNA knockdown, immunofluorescence of CRTC1 nuclear localization, chromatin immunoprecipitation, RT-PCR\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP identifies importin, with functional localization consequence; single lab study\",\n      \"pmids\": [\"30809299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LTD-inducing stimuli specifically dephosphorylate CRTC1 at Ser-151 and recruit CRTC1 from cytoplasm to nucleus, where it competes with FXR for binding to CREB and drives autophagy gene expression required for NMDAR-dependent late-phase LTD; disrupting CREB-CRTC1 synergistic actions impairs transcription-dependent autophagy and prevents L-LTD.\",\n      \"method\": \"Phospho-specific immunoblotting for CRTC1 Ser-151, live-cell imaging of CRTC1 nuclear translocation, dominant-negative constructs, Co-IP of CRTC1/CREB/FXR, autophagy assays, electrophysiological LTD recording\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (imaging, phospho-blotting, Co-IP, electrophysiology) with clear mechanistic and functional pathway placement\",\n      \"pmids\": [\"34289350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Excitatory GABA-induced BDNF transcription via promoter IV requires the combination of nuclear-localized CRTC1 (via calcineurin pathway) and CREB phosphorylation; CRTC1 nuclear translocation in cortical neurons is specifically induced by GABA via Ca2+/calcineurin signaling.\",\n      \"method\": \"Dominant-negative CREB overexpression, CRTC1 nuclear translocation imaging, pharmacological inhibitors (calcineurin, CaMK, MAPK), Bdnf-promoter IV-luciferase reporter, mRNA quantification\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, multiple methods but primarily pharmacological with reporter assays\",\n      \"pmids\": [\"24965890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The CRTC1-MAML2 gene fusion is found in benign hidradenomas of the skin (50% of cases), all of which show clear cell morphology, indicating the fusion oncogene has transforming activity beyond salivary gland tumors and is associated with clear cell differentiation across exocrine glands.\",\n      \"method\": \"FISH (CRTC1 and MAML2 loci), RT-PCR for fusion transcript, immunohistochemistry for fusion protein expression in tumor cells\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — molecular detection methods (FISH/RT-PCR/IHC) establish fusion presence and expression but mechanism inferred from prior studies\",\n      \"pmids\": [\"17334997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-184-3p directly targets CRTC1 mRNA 3'UTR; reduced miR-184-3p leads to CRTC1 upregulation in β-cells, which protects against lipotoxicity- and inflammation-induced apoptosis; silencing CRTC1 abrogates the protective effect of miR-184-3p inhibition. NKX6.1 directly controls miR-184 expression via its DNA-binding sites in the MIR184 promoter.\",\n      \"method\": \"miR-184-3p mimic/inhibitor experiments, siRNA knockdown of CRTC1, chromatin immunoprecipitation for NKX6.1 at MIR184 promoter, apoptosis assays, mRNA/protein quantification\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and functional rescue/knockdown experiments; single lab\",\n      \"pmids\": [\"35906204\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CRTC1 is a CREB transcriptional coactivator that is maintained in an inactive, cytoplasmic state by SIK-family kinase-mediated phosphorylation (at Ser151 and related sites), and is activated by calcineurin/PP2B-dependent dephosphorylation downstream of Ca2+ influx and cAMP signals, causing its nuclear translocation where it directly binds CREB, recruits co-activators (p300/CBP), and drives transcription of target genes (including Per1, BDNF, NR4A2, and autophagy genes) important for circadian entrainment, synaptic plasticity, memory, dendritic growth, bone anabolism, and melanogenesis; its N-terminal CREB-binding domain is hijacked in the oncogenic CRTC1-MAML2 fusion, which constitutively activates CREB-, AP-1-, Notch-, and MYC-dependent transcription to drive mucoepidermoid carcinoma.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CRTC1 is a signal-regulated transcriptional coactivator that integrates calcium and cAMP inputs to drive CREB-dependent and AP-1-dependent gene expression programs essential for synaptic plasticity, circadian entrainment, dendritic morphogenesis, and other processes. In its basal state, CRTC1 is retained in the cytoplasm by SIK-family kinase-mediated phosphorylation at Ser151; calcium influx through L-type VGCCs or NMDA receptors activates calcineurin/PP2B, which dephosphorylates CRTC1 and triggers its KPNA1-dependent nuclear import, where it binds CREB at target promoters (Per1, Bdnf, Nr4a2, autophagy genes) and recruits p300/CBP to activate transcription [PMID:19244510, PMID:20631169, PMID:25277455, PMID:30809299]. SIK1 itself is a CRTC1/CREB target gene that rephosphorylates CRTC1, establishing a negative feedback loop that gates circadian phase-shifting in the suprachiasmatic nucleus and limits transcriptional responses in neurons [PMID:23993098, PMID:31672960]. The CRTC1 N-terminal CREB-binding domain is recurrently hijacked in the CRTC1-MAML2 fusion oncoprotein, which constitutively activates CREB, AP-1, MYC, and downstream lncRNA (LINC00473) transcriptional programs to drive mucoepidermoid carcinoma and skin hidradenoma [PMID:15961999, PMID:19164581, PMID:25071166, PMID:29353885].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing that the CRTC1 N-terminus directly binds CREB and that this interaction is essential for the transforming activity of the CRTC1-MAML2 fusion provided the first molecular framework for CRTC1 as a CREB coactivator and explained how the t(11;19) translocation drives mucoepidermoid carcinoma.\",\n      \"evidence\": \"Co-IP, in vitro binding, reporter assays, and dominant-negative CREB experiments in MEC-derived cells\",\n      \"pmids\": [\"15961999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural detail of the CRTC1–CREB interface\", \"Wild-type CRTC1 coactivator function in normal cells not yet tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that neuronal activity drives CRTC1 nuclear translocation and that this is required specifically for late-phase LTP (but not early LTP) established CRTC1 as a gating coactivator for transcription-dependent synaptic plasticity.\",\n      \"evidence\": \"Subcellular fractionation, live imaging, dominant-negative and shRNA experiments with LTP electrophysiology in hippocampal slices\",\n      \"pmids\": [\"17183642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase/phosphatase cascade not yet identified\", \"In vivo behavioral relevance not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing that sustained CRTC1-MAML2 expression is required for tumor cell survival confirmed the fusion as an oncogenic driver rather than a passenger, validating it as a therapeutic target in MEC.\",\n      \"evidence\": \"RNAi knockdown with rescue by RNAi-resistant construct, colony formation and xenograft assays\",\n      \"pmids\": [\"16652146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effector pathways of the fusion not yet dissected\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identifying calcineurin-dependent dephosphorylation and calcium channel-gated nuclear import of CRTC1, together with SIK1 as a CRTC1/CREB target gene that rephosphorylates CRTC1, defined the core activation–feedback circuit controlling CRTC1 in neurons.\",\n      \"evidence\": \"Live-cell imaging, pharmacological inhibitors (calcineurin, L-type VGCC), shRNA knockdown, dendritic growth assays in cortical neurons\",\n      \"pmids\": [\"19244510\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites involved not mapped in this study\", \"Whether SIK1 directly phosphorylates CRTC1 in neurons or acts via intermediates not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovering that CRTC1 is recruited to AP-1 target promoters and physically associates with c-Jun/c-Fos expanded CRTC1 function beyond CREB to AP-1-dependent transcription, and showed AP-1 is essential for CRTC1-MAML2-driven transformation.\",\n      \"evidence\": \"ChIP, reciprocal Co-IP, CRTC1 knockout cells, colony formation assays\",\n      \"pmids\": [\"19164581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRTC1 coactivates AP-1 in normal (non-oncogenic) physiology not resolved\", \"Structural basis of CRTC1–AP-1 interaction unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showing that β-amyloid suppresses CRTC1 function by reducing L-type VGCC calcium influx and blocking calcineurin-dependent Ser151 dephosphorylation, with rescue by CRTC1-S151A, identified CRTC1 dysfunction as a mechanism linking Aβ to transcriptional and memory deficits in Alzheimer's disease models.\",\n      \"evidence\": \"Phospho-specific immunoblotting, constitutively active CRTC1 mutant rescue, gene expression profiling, behavioral memory tests in APP(Sw,Ind) transgenic mice\",\n      \"pmids\": [\"20631169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether restoring CRTC1 activity rescues cognitive deficits in vivo not fully demonstrated\", \"Contribution of other TORCs in AD not assessed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying that LKB1 loss derepresses CRTC1 nuclear localization and CRTC1-dependent NR4A2 expression linked the LKB1-SIK-CRTC1 axis to lung cancer cell growth, extending CRTC1's oncogenic relevance beyond the fusion context.\",\n      \"evidence\": \"Immunoblotting, subcellular fractionation, siRNA knockdown of NR4A2, growth assays in LKB1-null vs. wildtype cells\",\n      \"pmids\": [\"20010869\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Whether CRTC1 itself is required for LKB1-null tumor growth not directly tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that light-induced CRTC1 nuclear translocation in the SCN activates Per1 and Sik1, and that SIK1 feedback limits circadian phase-shifting, placed CRTC1 at the core of the photic entrainment pathway and explained behavioral gating of jet-lag recovery.\",\n      \"evidence\": \"In vivo SCN-targeted shRNA knockdown, behavioral wheel-running assays, ChIP of CRTC1 at Per1, immunohistochemistry for rhythmic CRTC1 nuclear expression\",\n      \"pmids\": [\"23993098\", \"23699513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRTC1 knockout animals show circadian phenotypes not tested\", \"Kinetics of CRTC1 dephosphorylation after photic stimulus not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Region-specific in vivo knockdown showing CRTC1 is required in the basolateral amygdala but not hippocampus for fear memory, combined with ChIP at IEG promoters, established brain-region selectivity of CRTC1-dependent memory encoding.\",\n      \"evidence\": \"Lentiviral shRNA in specific brain regions, fear conditioning behavior, ChIP for CRTC1 at IEG promoters\",\n      \"pmids\": [\"25277455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of region-specific CRTC1 engagement not explained\", \"Whether CRTC1 is required for other amygdala-dependent behaviors not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying that CRTC1-MAML2 interacts with MYC proteins and that this interaction is necessary for transformation added MYC as a third major transcription factor axis co-opted by the fusion oncoprotein.\",\n      \"evidence\": \"Co-IP, gene expression profiling, loss-of-function disrupting C1/M2-MYC interface, transformation assays in MEC cells\",\n      \"pmids\": [\"25071166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether wild-type CRTC1 interacts with MYC in normal cells not tested\", \"Structural basis of CRTC1-MAML2–MYC interaction unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing CRTC1 is recruited to HBV cccDNA at the preS2/S promoter with CREB, and that HBx stabilizes CRTC1 protein, revealed viral exploitation of host CRTC1 coactivator activity for HBV transcription.\",\n      \"evidence\": \"ChIP on cccDNA, Co-IP, siRNA knockdown, dominant-negative CRTC1, HBsAg/pgRNA quantification\",\n      \"pmids\": [\"25300488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether targeting CRTC1 reduces HBV in vivo not tested\", \"Mechanism by which HBx stabilizes CRTC1 not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying LINC00473 as a CRTC1-MAML2-induced lncRNA that binds NONO to feed back and amplify CREB-dependent transcription revealed a lncRNA-mediated feed-forward loop in the fusion's oncogenic program.\",\n      \"evidence\": \"Gene expression profiling, RNAi of LINC00473, RNA pulldown/Co-IP with NONO, xenograft tumor growth assays\",\n      \"pmids\": [\"29353885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LINC00473 has a role downstream of wild-type CRTC1 not tested\", \"Structural basis of LINC00473–NONO interaction unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identifying KPNA1 (Importin-α5) as the nuclear import receptor for CRTC1 provided the first mechanistic detail of how dephosphorylated CRTC1 gains nuclear access.\",\n      \"evidence\": \"Co-IP of CRTC1 with KPNA1, siRNA knockdown, immunofluorescence of CRTC1 localization, ChIP\",\n      \"pmids\": [\"30809299\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"NLS on CRTC1 recognized by KPNA1 not mapped\", \"Whether other importins contribute not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that SIK1 phosphorylates CRTC1 to suppress CREB-driven osteogenic gene expression, and that SIK1 KO mice have increased bone mass, extended the SIK-CRTC1 axis to bone anabolism.\",\n      \"evidence\": \"SIK1 KO mice with bone histomorphometry, kinase activity assay, reporter assays, CRTC1 phosphorylation immunoblotting\",\n      \"pmids\": [\"31672960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether bone phenotype is mediated specifically through CRTC1 vs. CRTC2/3 not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing that LTD stimuli specifically dephosphorylate CRTC1-Ser151 to drive autophagy gene expression required for late-phase LTD, and that CRTC1 competes with FXR for CREB binding, expanded CRTC1 function to depression-type synaptic plasticity and autophagy.\",\n      \"evidence\": \"Phospho-Ser151 immunoblotting, live imaging, Co-IP of CRTC1/CREB/FXR, autophagy assays, electrophysiological LTD recording\",\n      \"pmids\": [\"34289350\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo behavioral consequence of CRTC1-dependent autophagy in LTD not tested\", \"Mechanism of CRTC1–FXR competition not structurally characterized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"No high-resolution structure of the CRTC1–CREB complex exists, and the precise NLS/phosphodegron switching mechanism, the full spectrum of CRTC1-dependent transcriptional targets across tissues, and the in vivo consequences of CRTC1 genetic ablation in adult brain remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of CRTC1 or CRTC1–CREB complex\", \"Full-body Crtc1 knockout phenotype in adult conditional models not reported in timeline\", \"Relative contributions of CRTC1 vs. CRTC2/CRTC3 in overlapping tissues not systematically dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3, 7, 8, 9, 13, 16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 6, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2, 4, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 7, 8, 9, 15, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3, 7, 8, 9, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 4, 6, 14, 17]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 4, 9, 16]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 11, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CREB1\",\n      \"SIK1\",\n      \"KPNA1\",\n      \"MAML2\",\n      \"FXR\",\n      \"NONO\",\n      \"JUN\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}