{"gene":"SIK1","run_date":"2026-06-10T07:46:32","timeline":{"discoveries":[{"year":2007,"finding":"SIK1 functions as a class II HDAC kinase: CREB transcriptionally induces SIK1 expression, and SIK1 phosphorylates class II HDACs (e.g., HDAC5), leading to their inactivation and promotion of MEF2 activity in skeletal myocytes. Loss of SIK1 in M-ACREB mice reduced class II HDAC phosphorylation and caused a dystrophic phenotype.","method":"Dominant-negative CREB transgenic mice (M-ACREB), viral re-expression of SIK1, small molecule HDAC antagonist rescue of dystrophic phenotype","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic rescue in vivo, viral SIK1 re-expression, and small molecule confirmation; replicated across multiple experimental approaches in a single rigorous study","pmids":["17468767"],"is_preprint":false},{"year":2007,"finding":"SIK1 constitutively associates with the Na+,K+-ATPase (NK) regulatory complex. Elevated intracellular Na+ triggers Ca2+ influx via Na+/Ca2+ exchanger, activating SIK1 at Thr-322 via a calcium calmodulin-dependent kinase. Activated SIK1 phosphorylates PME-1, causing its dissociation from a PP2A/PME-1 complex on the NK alpha-subunit, leading to NK alpha-subunit dephosphorylation and increased Na+,K+-ATPase catalytic activity.","method":"Co-immunoprecipitation, in vitro phosphorylation assays, intracellular Ca2+ and Na+ measurements, fractionation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, in vitro kinase assay, multiple orthogonal biochemical methods identifying the kinase cascade and substrate in a single study","pmids":["17939993"],"is_preprint":false},{"year":2008,"finding":"SIK1 is activated by LKB1, which phosphorylates SIK1 at Thr182. SIK1 then auto-phosphorylates Ser186 (at the +4 position), and sustained SIK1 activity requires sequential phosphorylation of Ser186 then Thr182 by GSK-3β. Activated SIK1 phosphorylates TORC (CRTC) coactivators to repress CREB-dependent transcription, and also phosphorylates HDAC5 to promote nuclear export and MEF2C-driven PGC-1α expression in C2C12 myoblasts.","method":"In vitro kinase assays with purified GSK-3β, overexpression and inhibitor studies (GSK-3β and SIK inhibitors), AICAR treatment, nuclear export assays","journal":"Endocrine journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with purified kinase plus cell-based functional readouts; multiple orthogonal methods identifying phosphorylation sites and substrate cascade","pmids":["18946175"],"is_preprint":false},{"year":2009,"finding":"SIK1 acts downstream of LKB1 and upstream of p53 in an anoikis pathway. SIK1 loss compromised p53 function upon cell detachment, enabling anchorage-independent growth and metastasis in vivo. LKB1 required functional SIK1 to promote p53-dependent anoikis and suppress invasion.","method":"Kinome-wide RNAi loss-of-function screen, in vivo mouse metastasis model, Matrigel invasion assay, epistasis by combinatorial knockdown","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — kinome-wide screen validated with in vivo metastasis model and epistasis analysis; multiple methods across a well-controlled study","pmids":["19622832"],"is_preprint":false},{"year":2012,"finding":"SIK1 protein stability is regulated by PKA-mediated phosphorylation at Thr475 within a PEST domain: PKA phosphorylation at Thr475 extends SIK1 half-life by protecting it from proteasomal degradation. During myogenic differentiation, elevated PKA activity leads to SIK1 accumulation and stabilization, coupling cAMP signaling to the HDAC-MEF2 pathway. Depletion of SIK1 in primary muscle precursors impairs MEF2 protein accumulation and myogenic differentiation.","method":"Cell-free PKA phosphorylation assay, proteasome inhibitor treatment, PEST domain mutant analysis, SIK1 knockdown in primary myogenic progenitors","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cell-free kinase assay identifying Thr475 as a PKA site, combined with proteasome inhibitor rescue, PEST domain mutagenesis, and functional differentiation assay","pmids":["23256157"],"is_preprint":false},{"year":2013,"finding":"SIK1 is part of a negative feedback loop in circadian clock entrainment in the SCN. Light-induced CRTC1 coactivates CREB, driving Per1 and Sik1 expression. Induced SIK1 then phosphorylates and deactivates CRTC1, suppressing further clock shifts. SCN-specific Sik1 knockdown increases behavioral phase shifts and accelerates re-entrainment after experimental jet lag.","method":"Light-regulated SCN transcriptomics, in vivo Sik1 knockdown in SCN, behavioral phase-shift assays in mice","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knockdown with defined behavioral phenotype, light-regulated transcriptomics, and mechanistic dissection of CRTC1 phosphorylation-deactivation loop","pmids":["23993098"],"is_preprint":false},{"year":2013,"finding":"SIK1 phosphorylates CRTC2 (TORC2) at Ser171, causing its cytoplasmic sequestration, which suppresses gluconeogenic gene transcription (PEPCK, G6Pase) by preventing CRTC2-CREB coactivation in hepatic cells.","method":"SIK1 overexpression and knockdown in hepatocytes, phospho-CRTC2 immunoblotting, gluconeogenic reporter assays","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — phosphorylation site and functional outcome established but primarily by single lab, single publication methods","pmids":["33013689"],"is_preprint":false},{"year":2011,"finding":"Cocaine acutely activates SIK1 by phosphorylation at Thr-182, accompanied by nuclear import of SIK1. Nuclear SIK1 then phosphorylates HDAC5, causing shuttling of phospho-HDAC5 from nucleus to cytoplasm of striatal cells, leading to MEF2C induction. SIK1 activation also causes nuclear-to-cytoplasm translocation of TORC1/3.","method":"In vivo rat cocaine treatment, phospho-Thr182-SIK1 immunostaining, subcellular fractionation, HDAC5 phosphorylation assays, MEF2C gene expression analysis","journal":"Synapse (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo model with multiple biochemical and localization readouts; single lab but orthogonal methods","pmids":["21954104"],"is_preprint":false},{"year":2015,"finding":"De novo SIK1 mutations outside the kinase domain cause developmental epilepsies. Mutant SIK1 proteins retain autophosphorylation and kinase activity toward HDAC5, but truncated forms are resistant to degradation and show altered subcellular localization compared to wild-type SIK1.","method":"In vitro kinase assays (autophosphorylation and HDAC5 substrate), subcellular localization imaging, neuropathological examination of human SIK1 mutation cases","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay combined with localization imaging and human neuropathology; single study but multiple orthogonal methods","pmids":["25839329"],"is_preprint":false},{"year":2015,"finding":"SIK1 phosphorylates the co-repressor SMRT at Thr1391, which promotes SMRT/NCoR association with TBL1/TBLR1 and disrupts β-catenin's binding to the TBL1/TBLR1 complex, thereby inhibiting Wnt/β-catenin transcriptional activity in HCC. A non-phosphorylatable SMRT-T1391A mutant reverses this effect.","method":"Immunoprecipitation, in vitro kinase assay, luciferase reporter assay, chromatin immunoprecipitation, xenograft tumor models, SMRT-T1391A rescue experiments","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay identifying substrate and phosphorylation site combined with Co-IP, mutant rescue, and in vivo xenograft confirmation","pmids":["26778753"],"is_preprint":false},{"year":2015,"finding":"SIK1 physically interacts with and phosphorylates the C-terminal cytoplasmic domain of SR-B1 (scavenger receptor class B type 1), specifically at Ser496. This phosphorylation is critical for SIK1 stimulation of selective HDL-cholesteryl ester (CE) uptake and SR-B1-mediated steroidogenesis in adrenal cells. Both intact SIK1 catalytic activity and PKA-mediated phosphorylation of SIK1 are required for this effect.","method":"Co-immunoprecipitation, in vitro kinase assay, Ser496 mutagenesis, HDL-BODIPY-CE uptake assay, SIK1 knockdown/overexpression in adrenal cells","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis of phosphorylation site, Co-IP, and functional CE uptake assay; multiple orthogonal methods in one study","pmids":["26567857"],"is_preprint":false},{"year":2015,"finding":"SIK1 expression is regulated by and inhibited by cAMP signaling via induction of CRTC2: SIK1 represses StAR transcription/splicing through phosphorylation of CRTC2, but only as cAMP levels decline, providing negative feedback on steroidogenic gene expression in adrenal/testis cells.","method":"FISH-based single-cell visualization of StAR pRNA and mRNA, SIK1 overexpression/knockdown in Y1 adrenal and MA10 testis cells, qPCR","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel single-cell FISH visualization combined with genetic manipulation; single lab, two methods","pmids":["25662274"],"is_preprint":false},{"year":2016,"finding":"SIK1 is recruited to DNA replication sites via interaction with the GINS complex component Sld5. SIK1 phosphorylates MCM2 at five conserved N-terminal residues, which is essential for MCM helicase activation. SIK1 depletion causes defective DNA replication.","method":"Co-immunoprecipitation (Sld5-SIK1 interaction), in vitro kinase assay (MCM2 phosphorylation), SIK1 knockdown DNA replication assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vitro kinase assay plus loss-of-function phenotype; single lab, three orthogonal methods","pmids":["27592030"],"is_preprint":false},{"year":2017,"finding":"RNF2 acts as an E3 ubiquitin ligase that directly interacts with SIK1 and targets it for proteasomal degradation in hepatocellular carcinoma. Downregulation of RNF2 restores SIK1 levels and inhibits HCC cell growth.","method":"Co-immunoprecipitation, RNF2 knockdown rescue experiments, xenograft tumor models","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP establishing physical interaction and genetic rescue confirming E3 ligase role; single lab","pmids":["27911266"],"is_preprint":false},{"year":2018,"finding":"SIK1 suppresses NF-κB signaling in microglia: SIK1 knockdown promotes alcohol-induced NF-κB activity and increases caspase-3/9-mediated apoptosis in microglia, whereas SIK1 expression reduces NF-κB signaling. NF-κB inhibition (p65 depletion) reverses SIK1 knockdown-mediated apoptosis.","method":"SIK1 knockdown, NF-κB luciferase reporter assay, TUNEL staining, caspase activity assays, cell fluorescence staining","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis via p65 knockdown rescue combined with reporter assay and apoptosis measurements; single lab","pmids":["29929190"],"is_preprint":false},{"year":2019,"finding":"SIK1 and SIK3 are critical downstream effectors of LKB1 tumor suppressor function in NSCLC. Conditional genetic loss of Sik1 increased tumor growth in Kras-driven lung cancer mouse models, enhanced by Sik3 co-deletion. The SIK substrate CRTC2 was required for the proliferative benefit of SIK loss and for upregulation of AP1 and IL6 signaling.","method":"CRISPR-based genetic deletion in cell lines, conditional Sik1 knockout mouse models of Kras lung cancer, gene-expression analysis, CRTC2 epistasis experiments","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR in cell lines plus conditional knockout mouse model plus CRTC2 epistasis; multiple orthogonal methods across cell and animal models","pmids":["31350328"],"is_preprint":false},{"year":2020,"finding":"SIK1 phosphorylation at Ser577 (a PKA site) negatively regulates sleep: mice with Sik1-S577A mutation (loss of PKA phosphorylation site) showed shorter wake time, longer NREM sleep, and higher NREM delta density, indicating PKA-SIK1 signaling is involved in sleep need regulation.","method":"Sik1S577A knock-in mice generated by genome editing, polysomnographic sleep recording, sleep deprivation experiments","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knock-in with defined in vivo sleep phenotype; single lab with well-controlled electrophysiological readout","pmids":["32457359"],"is_preprint":false},{"year":2020,"finding":"SIK1 activates PDE4, leading to reduced cAMP accumulation and inhibition of the cAMP/PKA/CREB pathway, thereby suppressing hepatic gluconeogenesis. The natural compound phanginin A activates SIK1 via LKB1 phosphorylation, and its effects are blocked by SIK1 knockdown or pan-SIK inhibitor HG-9-91-01.","method":"SIK1 siRNA knockdown, SIK1 overexpression, PDE4 activity assays, cAMP measurement, gluconeogenic gene expression, pan-SIK inhibitor HG-9-91-01, ob/ob mouse glucose tolerance assays","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (siRNA, overexpression, PDE4 activity, cAMP measurement, inhibitor) in both primary hepatocytes and in vivo; single lab","pmids":["32599076"],"is_preprint":false},{"year":2021,"finding":"C-terminal truncation mutations of SIK1 (as in ASD/epilepsy patients) alter SIK1 subcellular distribution from exclusively nuclear to both nuclear and cytoplasmic. SIK1-MT mice show increased excitatory synaptic transmission, enhanced pyramidal neuron excitability in mPFC layer 5, disrupted E/I synaptic balance, and increased repetitive behavior.","method":"CRISPR/Cas9-generated SIK1 truncation knock-in mice, subcellular localization imaging, electrophysiology (excitatory and inhibitory synaptic recordings), behavioral assays","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR knock-in with subcellular localization imaging and electrophysiology; single lab with multiple readouts","pmids":["34295222"],"is_preprint":false},{"year":2022,"finding":"BMI1 directly binds the SIK1 promoter in a complex with RING1B, promoting H2AK119 monoubiquitination and inhibiting H3K4me3, resulting in transcriptional repression of SIK1 in osteosarcoma cells.","method":"ChIP-qPCR at SIK1 promoter for BMI1, RING1B, H2AK119ub, and H3K4me3; SIK1 rescue experiments in BMI1-deficient cells; xenograft models","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR demonstrating direct promoter binding plus functional rescue; single lab","pmids":["35346195"],"is_preprint":false},{"year":2023,"finding":"AKT binds SIK1 and phosphorylates it, relieving SIK1-mediated repression of STAT3 in a phosphorylation-dependent manner. AKT-phosphorylated SIK1 interacts with 14-3-3, translocates to the cytoplasm, and is then facilitated by the isomerase Pin1 to interact with E3 ligase ITCH, leading to SIK1 ubiquitination and degradation.","method":"Mass spectrometry-based interactome analysis, Co-immunoprecipitation (AKT-SIK1, SIK1-14-3-3, SIK1-Pin1, SIK1-ITCH), subcellular fractionation, phosphorylation assays, ubiquitination assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — MS-based interactome plus reciprocal Co-IPs plus ubiquitination assay plus localization; multiple orthogonal methods in a single rigorous study","pmids":["36806887"],"is_preprint":false},{"year":2023,"finding":"SIK1 interacts with Smad7 (validated by co-immunoprecipitation) and inhibits phosphorylation of Smad2, suppressing TGF-β/Smad signaling and downstream EMT markers in colorectal cancer cells.","method":"Co-immunoprecipitation (SIK1-Smad7), phospho-Smad2 immunoblotting, SIK1 overexpression/knockdown, galunisertib (TGF-β inhibitor) rescue","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP for binding plus functional phosphorylation readout; single lab with epistasis using TGF-β inhibitor","pmids":["37670972"],"is_preprint":false},{"year":2018,"finding":"SIK1 suppresses gluconeogenic gene transcription by inducing phosphorylation, K48-linked polyubiquitination and proteasomal degradation of CRTC1. Phosphorylation occurs at S155, S167, S188 and S346 of CRTC1. This ubiquitination is mediated by the E3 ligase RFWD2. SIK2 and SIK3 do not replicate this effect on CRTC1.","method":"SIK1/2/3 overexpression comparison, CRTC1 phosphomutant analysis, ubiquitination assays, RFWD2 co-expression, gluconeogenic gene reporter assays","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mapping, ubiquitination assay, RFWD2 identification; single lab but multiple orthogonal methods","pmids":["29408765"],"is_preprint":false},{"year":2010,"finding":"Lack of SIK1 in mouse embryonic stem cells impairs cardiomyogenesis: in SIK1-null ES-derived embryoid bodies, temporal appearance of cardiomyocytes is delayed. Expression profiling revealed SIK1 controls a genetic network involving the cyclin-dependent kinase inhibitor p57(Kip2) to regulate cardiomyoblast cell cycle exit.","method":"Gene-trap SIK1-null ES cells, embryoid body differentiation assay, gene expression profiling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — null ES cell model with differentiation phenotype and transcriptomics; single lab, two orthogonal readouts","pmids":["20140255"],"is_preprint":false},{"year":2015,"finding":"SIK1 knockout mice on a chronic high-salt diet develop increased systolic blood pressure, upregulated TGF-β1 signaling, increased endothelin-1, and vascular smooth muscle cell contractile marker expression. SIK1 knockdown in vitro upregulates collagen in adventitial fibroblasts and contractile markers in VSMCs, establishing SIK1 as a regulator of VSMC phenotype via TGF-β1 inhibition.","method":"SIK1 knockout mice with high-salt challenge, SIK1 in vitro knockdown in VSMCs and fibroblasts, blood pressure monitoring, TGF-β1 signaling assays","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse phenotype with in vitro mechanistic follow-up; single lab, two orthogonal models","pmids":["25556206"],"is_preprint":false},{"year":2014,"finding":"Gastrin induces SIK1 expression through Gq/G11-coupled CCK2 receptor signaling, and SIK1 induction is negatively regulated by ICER. Gastrin activates LKB1 at Ser-428 and SIK1 at Thr-182. Ectopic SIK1 increases gastrin-induced HDAC4 phosphorylation and nuclear export of HDACs. SIK1 knockdown increases migration of gastric adenocarcinoma cells.","method":"SIK1 siRNA knockdown, phospho-HDAC4 immunoblotting, HDAC nuclear export assay, luciferase reporter assays, migration assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with multiple functional readouts (migration, HDAC phosphorylation, reporter); single lab","pmids":["25384047"],"is_preprint":false},{"year":2025,"finding":"SIK1 phosphorylates HDAC5 at Ser498, promoting HDAC5 interaction with 14-3-3 protein, which protects HDAC5 from TRIM28-mediated ubiquitylation and degradation. SIK1-stabilized HDAC5 deacetylates STAT6, enhancing its transcriptional activity to upregulate SLC7A11 expression, rendering pancreatic cancer cells resistant to ferroptosis.","method":"In vitro kinase assay (HDAC5 Ser498 phosphorylation), Co-immunoprecipitation (HDAC5-14-3-3, HDAC5-TRIM28), ubiquitination assay, STAT6 acetylation assays, organoid and PDX models","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with substrate site mapping, Co-IP, ubiquitination assay, and functional PDX model; multiple orthogonal methods in a single rigorous study","pmids":["40250791"],"is_preprint":false},{"year":2024,"finding":"FTO-mediated m6A demethylation at the 3'-UTR of SIK1 mRNA reduces SIK1 expression and mRNA stability in trophoblasts under hyperglycemic conditions. Decreased SIK1 impairs placental cytotrophoblast syncytialization in type 2 diabetes mellitus.","method":"MeRIP-Seq and RNA-Seq combined analysis, FTO binding to SIK1 3'-UTR m6A site, mRNA stability assays, trophoblast syncytialization functional assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combined MeRIP-Seq/RNA-Seq with FTO binding and mRNA stability assays and functional syncytialization readout; single lab","pmids":["38883837"],"is_preprint":false},{"year":2004,"finding":"SIK1 (snf1lk/msk) is expressed in skeletal muscle progenitor cells and early cardiomyocytes. Inducible expression of the SIK1 kinase domain in CHO cells blocks cell division and causes extra rounds of DNA replication to yield 8N and 16N cells, suggesting a role in G2/M cell cycle regulation.","method":"Tetracycline-inducible SNF1LK kinase domain expression in CHO cells, flow cytometric DNA content analysis","journal":"Genomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single overexpression experiment in a heterologous cell line with no mechanistic substrate identification","pmids":["15177563"],"is_preprint":false}],"current_model":"SIK1 is an AMPK-family serine/threonine kinase activated by LKB1 (which phosphorylates Thr182) and calcium/calmodulin-dependent kinases (Thr322), and further stabilized by PKA-mediated phosphorylation (Thr475/Ser577); once active, it phosphorylates class II HDACs (HDAC4/5 at conserved sites) to drive their nuclear export and MEF2-dependent gene expression, phosphorylates CRTC/TORC coactivators (CRTC1/2) to suppress CREB-dependent gluconeogenic and steroidogenic transcription, phosphorylates SMRT-T1391 to inhibit Wnt/β-catenin signaling, phosphorylates SR-B1-Ser496 to enhance cholesterol uptake, phosphorylates PME-1 to activate Na+,K+-ATPase in response to sodium sensing, and phosphorylates MCM2 to activate the replication helicase; SIK1 is itself negatively regulated by AKT-mediated phosphorylation (promoting 14-3-3 binding, cytoplasmic translocation, and ITCH-dependent ubiquitination/degradation), by RNF2-mediated ubiquitination, and by BMI1-mediated epigenetic repression of its promoter, positioning SIK1 as a central tumor-suppressive kinase that integrates cAMP, calcium, and energy signals to control gene transcription, metabolism, circadian entrainment, and cellular survival."},"narrative":{"mechanistic_narrative":"SIK1 is an LKB1-activated, AMPK-family serine/threonine kinase that integrates cAMP, calcium, and energy signals to control gene transcription, metabolism, and cell fate, functioning broadly as a tumor-suppressive node [PMID:19622832, PMID:31350328]. Its activation requires LKB1-mediated phosphorylation at Thr182 followed by Ser186 autophosphorylation, with sustained activity dependent on sequential GSK-3β phosphorylation [PMID:18946175]; in distinct contexts calcium/calmodulin-dependent kinase activates SIK1 at Thr322 [PMID:17939993], and PKA phosphorylation at Thr475 within a PEST domain stabilizes the protein against proteasomal degradation [PMID:23256157]. A core transcriptional output of SIK1 is phosphorylation of CRTC/TORC coactivators (CRTC1 at multiple sites, CRTC2 at Ser171), driving their cytoplasmic sequestration or RFWD2-mediated degradation to repress CREB-dependent gluconeogenic and steroidogenic gene programs [PMID:33013689, PMID:29408765, PMID:25662274]; SIK1 reinforces this by activating PDE4 to lower cAMP [PMID:32599076]. SIK1 also phosphorylates class II HDACs (HDAC4/HDAC5) to drive their 14-3-3-dependent nuclear export and MEF2 activation, coupling cAMP/PKA signaling to myogenic differentiation [PMID:18946175, PMID:23256157, PMID:25384047]. SIK1 participates in a CREB-driven negative feedback loop that limits light-induced circadian phase shifts in the SCN through CRTC1 deactivation [PMID:23993098]. Beyond transcription, SIK1 phosphorylates PME-1 to activate Na+,K+-ATPase upon sodium/calcium sensing [PMID:17939993], phosphorylates MCM2 after recruitment by the GINS subunit Sld5 to license DNA replication [PMID:27592030], phosphorylates SMRT at Thr1391 to inhibit Wnt/β-catenin signaling [PMID:26778753], and phosphorylates SR-B1 at Ser496 to promote HDL-cholesterol uptake [PMID:26567857]. SIK1 is opposed by AKT, which phosphorylates it to promote 14-3-3 binding, cytoplasmic translocation, and Pin1/ITCH-dependent ubiquitination and degradation [PMID:36806887], by the E3 ligase RNF2 [PMID:27911266], and by BMI1/RING1B-mediated epigenetic silencing of its promoter [PMID:35346195]. De novo C-terminal SIK1 mutations that escape degradation and alter nuclear localization cause developmental epilepsy and autism-spectrum phenotypes [PMID:25839329, PMID:34295222].","teleology":[{"year":2004,"claim":"Initial characterization asked where SIK1 acts and what cellular process it influences, establishing an early link to cell cycle control.","evidence":"Inducible SIK1 kinase domain expression in CHO cells with flow cytometric DNA content analysis","pmids":["15177563"],"confidence":"Low","gaps":["Single overexpression in a heterologous line with no substrate identified","Does not establish a physiological cell-cycle role","Mechanism of the polyploidy phenotype undefined"]},{"year":2007,"claim":"Established SIK1 as a class II HDAC kinase downstream of CREB, defining the HDAC5-MEF2 transcriptional axis in muscle.","evidence":"Dominant-negative CREB mice, viral SIK1 re-expression, and HDAC antagonist rescue of dystrophic phenotype","pmids":["17468767"],"confidence":"High","gaps":["Activation inputs not fully resolved at this stage","HDAC5 site specificity not mapped here"]},{"year":2007,"claim":"Defined a calcium-triggered activation route and a non-transcriptional substrate, showing SIK1 couples sodium sensing to ion-pump regulation.","evidence":"Co-IP, in vitro kinase assays, and intracellular Ca2+/Na+ measurements on the Na+,K+-ATPase complex","pmids":["17939993"],"confidence":"High","gaps":["Physiological contexts beyond cultured cells not defined","Interplay with the LKB1 activation route unresolved"]},{"year":2008,"claim":"Resolved the activation hierarchy of SIK1, placing LKB1-Thr182, Ser186 autophosphorylation, and GSK-3β in a defined sequence.","evidence":"In vitro kinase assays with purified GSK-3β plus inhibitor and nuclear-export readouts in C2C12","pmids":["18946175"],"confidence":"High","gaps":["Quantitative contribution of each phospho-event to activity unclear","Tissue-specificity of GSK-3β input untested"]},{"year":2009,"claim":"Placed SIK1 in the LKB1 tumor-suppressor pathway, linking it to p53-dependent anoikis and metastasis suppression.","evidence":"Kinome-wide RNAi screen, in vivo metastasis model, and combinatorial-knockdown epistasis","pmids":["19622832"],"confidence":"High","gaps":["Direct SIK1 substrate connecting to p53 not identified","Generality across tumor types not established"]},{"year":2010,"claim":"Implicated SIK1 in developmental cell-cycle exit, showing it controls a p57Kip2 network during cardiomyogenesis.","evidence":"Gene-trap SIK1-null ES cells, embryoid body differentiation, and expression profiling","pmids":["20140255"],"confidence":"Medium","gaps":["Direct substrate linking SIK1 to p57Kip2 not defined","In vivo developmental requirement not tested"]},{"year":2011,"claim":"Demonstrated stimulus-coupled SIK1 activation in vivo, with cocaine driving Thr182 phosphorylation, nuclear import, and HDAC5/CRTC shuttling.","evidence":"In vivo rat cocaine treatment with phospho-SIK1 immunostaining, fractionation, and MEF2C readouts","pmids":["21954104"],"confidence":"Medium","gaps":["Upstream kinase driving Thr182 in this context not pinned down","Behavioral consequences not tested"]},{"year":2012,"claim":"Explained how cAMP/PKA stabilizes SIK1, identifying Thr475 in a PEST domain as the degradation-protective PKA site coupling SIK1 to myogenesis.","evidence":"Cell-free PKA assay, proteasome inhibition, PEST mutagenesis, and knockdown in myogenic progenitors","pmids":["23256157"],"confidence":"High","gaps":["Identity of the degrading E3 ligase not addressed here","Stoichiometry of stabilization not quantified"]},{"year":2013,"claim":"Defined SIK1 as a circadian feedback brake, with CREB-induced SIK1 deactivating CRTC1 to limit light-induced phase shifts.","evidence":"Light-regulated SCN transcriptomics, in vivo SCN Sik1 knockdown, and behavioral phase-shift assays","pmids":["23993098"],"confidence":"High","gaps":["Molecular timing of the feedback loop not fully kinetically resolved","Relevance to peripheral clocks untested"]},{"year":2013,"claim":"Mapped the CRTC2 phosphorylation site (Ser171) underlying SIK1 suppression of hepatic gluconeogenic transcription.","evidence":"SIK1 overexpression/knockdown in hepatocytes with phospho-CRTC2 blotting and gluconeogenic reporters","pmids":["33013689"],"confidence":"Medium","gaps":["Single-lab methods","In vivo glycemic relevance not directly tested here"]},{"year":2014,"claim":"Connected receptor signaling to SIK1, showing gastrin via CCK2/Gq induces and activates SIK1 to drive HDAC4 export and restrain cancer cell migration.","evidence":"siRNA knockdown, phospho-HDAC4 blotting, HDAC export and migration assays in gastric cells","pmids":["25384047"],"confidence":"Medium","gaps":["Direct HDAC4 site not mapped","ICER regulatory loop only partially defined"]},{"year":2015,"claim":"Expanded the SIK1 substrate repertoire and tumor-suppressor scope: SMRT-Thr1391 phosphorylation inhibits Wnt/β-catenin, SR-B1-Ser496 promotes cholesterol uptake, and CRTC2 mediates steroidogenic feedback.","evidence":"In vitro kinase assays, Co-IP, mutant rescue, reporter/ChIP, xenografts, and cholesterol uptake/FISH assays","pmids":["26778753","26567857","25662274"],"confidence":"High","gaps":["Cross-talk between these substrate arms not integrated","Tissue-selectivity of substrate choice unexplained"]},{"year":2015,"claim":"Linked SIK1 to human disease, identifying de novo C-terminal mutations causing developmental epilepsy with retained kinase activity but altered stability and localization.","evidence":"In vitro kinase/autophosphorylation assays, localization imaging, and human neuropathology","pmids":["25839329"],"confidence":"Medium","gaps":["Causal neuronal mechanism not resolved in this study","Genotype-phenotype range incomplete"]},{"year":2015,"claim":"Established a cardiovascular role, with SIK1 restraining TGF-β1 signaling and VSMC contractile phenotype under salt stress.","evidence":"SIK1 knockout mice on high-salt diet with in vitro VSMC/fibroblast knockdown and blood pressure monitoring","pmids":["25556206"],"confidence":"Medium","gaps":["Direct substrate in TGF-β1 pathway not identified","Single-lab model"]},{"year":2016,"claim":"Revealed a replication-licensing function, with Sld5-mediated recruitment enabling SIK1 phosphorylation of MCM2 to activate the helicase.","evidence":"Co-IP, in vitro MCM2 kinase assay, and SIK1 knockdown replication assays","pmids":["27592030"],"confidence":"Medium","gaps":["How SIK1 activity is timed to S phase unclear","Independent confirmation of MCM2 site needed"]},{"year":2017,"claim":"Identified RNF2 as an E3 ligase degrading SIK1 in hepatocellular carcinoma, defining a route of tumor-promoting SIK1 loss.","evidence":"Co-IP, RNF2 knockdown rescue, and xenograft models","pmids":["27911266"],"confidence":"Medium","gaps":["Degron and ubiquitination sites on SIK1 not mapped","Single-lab Co-IP evidence"]},{"year":2018,"claim":"Distinguished SIK1 from paralogs in metabolic control, showing SIK1-specific induction of CRTC1 phosphorylation and RFWD2-mediated degradation to repress gluconeogenesis.","evidence":"SIK1/2/3 comparison, CRTC1 phosphomutant analysis, ubiquitination assays, and RFWD2 co-expression","pmids":["29408765"],"confidence":"Medium","gaps":["In vivo relevance of CRTC1 degradation untested here","Why only SIK1 acts on CRTC1 unexplained"]},{"year":2018,"claim":"Extended SIK1's anti-inflammatory and pro-survival role, showing it suppresses NF-κB and apoptosis in microglia.","evidence":"SIK1 knockdown, NF-κB reporter, TUNEL/caspase assays, and p65-depletion epistasis","pmids":["29929190"],"confidence":"Medium","gaps":["Direct SIK1 substrate in NF-κB pathway not identified","Tier 3 single-lab evidence"]},{"year":2019,"claim":"Confirmed in vivo that SIK1 (with SIK3) mediates LKB1 tumor suppression in lung cancer through CRTC2-dependent AP1/IL6 signaling.","evidence":"CRISPR deletion, conditional Sik1 knockout Kras lung cancer mice, and CRTC2 epistasis","pmids":["31350328"],"confidence":"High","gaps":["Relative contributions of SIK1 versus SIK3 not fully separated","Therapeutic implications of restoring SIK activity not addressed"]},{"year":2020,"claim":"Added effector and physiological dimensions: SIK1 activates PDE4 to lower cAMP and suppress gluconeogenesis, and PKA-Ser577 phosphorylation links SIK1 to sleep-need regulation.","evidence":"siRNA/overexpression with PDE4 activity and cAMP assays in hepatocytes/ob-ob mice; Sik1-S577A knock-in mice with polysomnography","pmids":["32599076","32457359"],"confidence":"High","gaps":["Mechanism by which SIK1 activates PDE4 not detailed","Neural circuit mediating the sleep effect undefined"]},{"year":2021,"claim":"Mechanistically connected SIK1 C-terminal truncations to neuronal dysfunction, showing mislocalization and disrupted excitatory/inhibitory balance with autism-like behavior.","evidence":"CRISPR truncation knock-in mice, localization imaging, electrophysiology, and behavioral assays","pmids":["34295222"],"confidence":"Medium","gaps":["Causal substrate driving the synaptic phenotype not identified","Single-lab model"]},{"year":2023,"claim":"Defined the dominant negative-regulatory axis: AKT phosphorylates SIK1 to recruit 14-3-3, drive cytoplasmic translocation, and trigger Pin1/ITCH-dependent degradation, relieving SIK1 repression of STAT3.","evidence":"MS interactome, reciprocal Co-IPs, fractionation, phosphorylation, and ubiquitination assays","pmids":["36806887"],"confidence":"High","gaps":["AKT phosphosite(s) on SIK1 not specified here","Reconciliation with PKA-stabilization not addressed"]},{"year":2023,"claim":"Added a TGF-β axis to SIK1's tumor-suppressive repertoire via Smad7 interaction and inhibition of Smad2 phosphorylation in colorectal cancer.","evidence":"Single Co-IP (SIK1-Smad7), phospho-Smad2 blotting, and galunisertib rescue","pmids":["37670972"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation","Whether SIK1 directly phosphorylates a Smad component unknown"]},{"year":2022,"claim":"Revealed epigenetic suppression of SIK1, with BMI1/RING1B repressing its promoter via H2AK119ub and H3K4me3 loss in osteosarcoma.","evidence":"ChIP-qPCR at the SIK1 promoter, SIK1 rescue in BMI1-deficient cells, and xenografts","pmids":["35346195"],"confidence":"Medium","gaps":["Upstream signals controlling BMI1 recruitment unknown","Single-lab evidence"]},{"year":2024,"claim":"Showed post-transcriptional control of SIK1, with FTO-mediated m6A demethylation reducing SIK1 mRNA stability and impairing trophoblast syncytialization in diabetes.","evidence":"MeRIP-Seq/RNA-Seq, FTO binding to the SIK1 3'-UTR, mRNA stability and syncytialization assays","pmids":["38883837"],"confidence":"Medium","gaps":["Downstream SIK1 substrate in syncytialization not defined","Single-lab evidence"]},{"year":2025,"claim":"Identified a context-specific oncogenic output, with SIK1 phosphorylating HDAC5-Ser498 to stabilize it via 14-3-3, deacetylate STAT6, and confer ferroptosis resistance through SLC7A11.","evidence":"In vitro kinase assay, Co-IP, ubiquitination and STAT6 acetylation assays, organoid and PDX models","pmids":["40250791"],"confidence":"High","gaps":["Reconciliation of this oncogenic role with SIK1 tumor suppression unresolved","Tissue determinants of pro- versus anti-tumor output unknown"]},{"year":null,"claim":"It remains unresolved how SIK1 substrate selection and its dual tumor-suppressive versus oncogenic outputs are determined across tissues, and how competing PKA-stabilizing and AKT-destabilizing inputs are integrated in vivo.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of context-dependent substrate choice","Integration of opposing stability inputs untested in vivo","Structural basis of substrate recognition undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,6,9,10,12,22,26]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,2,6,9,10,12,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,5,6,22]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,8,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,18,20]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,6,17,20]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,5,6,9,22]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[6,10,17,22]},{"term_id":"R-HSA-9909396","term_label":"Circadian 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Phosphorylates HDAC4, HDAC5, PPME1, SREBF1, CRTC1/TORC1. Inhibits CREB activity by phosphorylating and inhibiting activity of TORCs, the CREB-specific coactivators, like CRTC2/TORC2 and CRTC3/TORC3 in response to cAMP signaling (PubMed:29211348). Acts as a tumor suppressor and plays a key role in p53/TP53-dependent anoikis, a type of apoptosis triggered by cell detachment: required for phosphorylation of p53/TP53 in response to loss of adhesion and is able to suppress metastasis. Part of a sodium-sensing signaling network, probably by mediating phosphorylation of PPME1: following increases in intracellular sodium, SIK1 is activated by CaMK1 and phosphorylates PPME1 subunit of protein phosphatase 2A (PP2A), leading to dephosphorylation of sodium/potassium-transporting ATPase ATP1A1 and subsequent increase activity of ATP1A1. Acts as a regulator of muscle cells by phosphorylating and inhibiting class II histone deacetylases HDAC4 and HDAC5, leading to promote expression of MEF2 target genes in myocytes. Also required during cardiomyogenesis by regulating the exit of cardiomyoblasts from the cell cycle via down-regulation of CDKN1C/p57Kip2. Acts as a regulator of hepatic gluconeogenesis by phosphorylating and repressing the CREB-specific coactivators CRTC1/TORC1 and CRTC2/TORC2, leading to inhibit CREB activity. Also regulates hepatic lipogenesis by phosphorylating and inhibiting SREBF1. In concert with CRTC1/TORC1, regulates the light-induced entrainment of the circadian clock by attenuating PER1 induction; represses CREB-mediated transcription of PER1 by phosphorylating and deactivating CRTC1/TORC1 (By similarity)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P57059/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SIK1","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SIK1","total_profiled":1310},"omim":[{"mim_id":"616341","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 30; DEE30","url":"https://www.omim.org/entry/616341"},{"mim_id":"614776","title":"SIK FAMILY KINASE 3; SIK3","url":"https://www.omim.org/entry/614776"},{"mim_id":"614545","title":"ENDOPLASMIC RETICULUM MEMBRANE PROTEIN COMPLEX, SUBUNIT 10; EMC10","url":"https://www.omim.org/entry/614545"},{"mim_id":"605705","title":"SALT-INDUCIBLE KINASE 1; SIK1","url":"https://www.omim.org/entry/605705"},{"mim_id":"312612","title":"RETINITIS PIGMENTOSA 6; RP6","url":"https://www.omim.org/entry/312612"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SIK1"},"hgnc":{"alias_symbol":["msk"],"prev_symbol":["SNF1LK"]},"alphafold":{"accession":"P57059","domains":[{"cath_id":"3.30.200.20","chopping":"24-104","consensus_level":"medium","plddt":94.1394,"start":24,"end":104},{"cath_id":"1.10.510.10","chopping":"110-279","consensus_level":"high","plddt":93.9548,"start":110,"end":279},{"cath_id":"-","chopping":"307-353","consensus_level":"medium","plddt":90.7336,"start":307,"end":353}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P57059","model_url":"https://alphafold.ebi.ac.uk/files/AF-P57059-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P57059-F1-predicted_aligned_error_v6.png","plddt_mean":59.34},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SIK1","jax_strain_url":"https://www.jax.org/strain/search?query=SIK1"},"sequence":{"accession":"P57059","fasta_url":"https://rest.uniprot.org/uniprotkb/P57059.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P57059/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P57059"}},"corpus_meta":[{"pmid":"25801821","id":"PMC_25801821","title":"Memorial 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[et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/19547917","citation_count":26,"is_preprint":false},{"pmid":"25662274","id":"PMC_25662274","title":"Stimulation of StAR expression by cAMP is controlled by inhibition of highly inducible SIK1 via CRTC2, a co-activator of CREB.","date":"2015","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/25662274","citation_count":23,"is_preprint":false},{"pmid":"25384047","id":"PMC_25384047","title":"Salt-inducible kinase 1 (SIK1) is induced by gastrin and inhibits migration of gastric adenocarcinoma cells.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25384047","citation_count":21,"is_preprint":false},{"pmid":"30050311","id":"PMC_30050311","title":"SIK1-LNC represses the proliferative, migrative, and invasive abilities of lung cancer cells.","date":"2018","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/30050311","citation_count":21,"is_preprint":false},{"pmid":"26567857","id":"PMC_26567857","title":"A Novel Role of Salt-Inducible Kinase 1 (SIK1) in the Post-Translational Regulation of Scavenger Receptor Class B Type 1 Activity.","date":"2015","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26567857","citation_count":21,"is_preprint":false},{"pmid":"31193314","id":"PMC_31193314","title":"Response surface based optimization of laccase production from Bacillus sp. 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Loss of SIK1 in M-ACREB mice reduced class II HDAC phosphorylation and caused a dystrophic phenotype.\",\n      \"method\": \"Dominant-negative CREB transgenic mice (M-ACREB), viral re-expression of SIK1, small molecule HDAC antagonist rescue of dystrophic phenotype\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic rescue in vivo, viral SIK1 re-expression, and small molecule confirmation; replicated across multiple experimental approaches in a single rigorous study\",\n      \"pmids\": [\"17468767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SIK1 constitutively associates with the Na+,K+-ATPase (NK) regulatory complex. Elevated intracellular Na+ triggers Ca2+ influx via Na+/Ca2+ exchanger, activating SIK1 at Thr-322 via a calcium calmodulin-dependent kinase. Activated SIK1 phosphorylates PME-1, causing its dissociation from a PP2A/PME-1 complex on the NK alpha-subunit, leading to NK alpha-subunit dephosphorylation and increased Na+,K+-ATPase catalytic activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro phosphorylation assays, intracellular Ca2+ and Na+ measurements, fractionation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, in vitro kinase assay, multiple orthogonal biochemical methods identifying the kinase cascade and substrate in a single study\",\n      \"pmids\": [\"17939993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SIK1 is activated by LKB1, which phosphorylates SIK1 at Thr182. SIK1 then auto-phosphorylates Ser186 (at the +4 position), and sustained SIK1 activity requires sequential phosphorylation of Ser186 then Thr182 by GSK-3β. Activated SIK1 phosphorylates TORC (CRTC) coactivators to repress CREB-dependent transcription, and also phosphorylates HDAC5 to promote nuclear export and MEF2C-driven PGC-1α expression in C2C12 myoblasts.\",\n      \"method\": \"In vitro kinase assays with purified GSK-3β, overexpression and inhibitor studies (GSK-3β and SIK inhibitors), AICAR treatment, nuclear export assays\",\n      \"journal\": \"Endocrine journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with purified kinase plus cell-based functional readouts; multiple orthogonal methods identifying phosphorylation sites and substrate cascade\",\n      \"pmids\": [\"18946175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SIK1 acts downstream of LKB1 and upstream of p53 in an anoikis pathway. SIK1 loss compromised p53 function upon cell detachment, enabling anchorage-independent growth and metastasis in vivo. LKB1 required functional SIK1 to promote p53-dependent anoikis and suppress invasion.\",\n      \"method\": \"Kinome-wide RNAi loss-of-function screen, in vivo mouse metastasis model, Matrigel invasion assay, epistasis by combinatorial knockdown\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — kinome-wide screen validated with in vivo metastasis model and epistasis analysis; multiple methods across a well-controlled study\",\n      \"pmids\": [\"19622832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SIK1 protein stability is regulated by PKA-mediated phosphorylation at Thr475 within a PEST domain: PKA phosphorylation at Thr475 extends SIK1 half-life by protecting it from proteasomal degradation. During myogenic differentiation, elevated PKA activity leads to SIK1 accumulation and stabilization, coupling cAMP signaling to the HDAC-MEF2 pathway. Depletion of SIK1 in primary muscle precursors impairs MEF2 protein accumulation and myogenic differentiation.\",\n      \"method\": \"Cell-free PKA phosphorylation assay, proteasome inhibitor treatment, PEST domain mutant analysis, SIK1 knockdown in primary myogenic progenitors\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cell-free kinase assay identifying Thr475 as a PKA site, combined with proteasome inhibitor rescue, PEST domain mutagenesis, and functional differentiation assay\",\n      \"pmids\": [\"23256157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SIK1 is part of a negative feedback loop in circadian clock entrainment in the SCN. Light-induced CRTC1 coactivates CREB, driving Per1 and Sik1 expression. Induced SIK1 then phosphorylates and deactivates CRTC1, suppressing further clock shifts. SCN-specific Sik1 knockdown increases behavioral phase shifts and accelerates re-entrainment after experimental jet lag.\",\n      \"method\": \"Light-regulated SCN transcriptomics, in vivo Sik1 knockdown in SCN, behavioral phase-shift assays in mice\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knockdown with defined behavioral phenotype, light-regulated transcriptomics, and mechanistic dissection of CRTC1 phosphorylation-deactivation loop\",\n      \"pmids\": [\"23993098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SIK1 phosphorylates CRTC2 (TORC2) at Ser171, causing its cytoplasmic sequestration, which suppresses gluconeogenic gene transcription (PEPCK, G6Pase) by preventing CRTC2-CREB coactivation in hepatic cells.\",\n      \"method\": \"SIK1 overexpression and knockdown in hepatocytes, phospho-CRTC2 immunoblotting, gluconeogenic reporter assays\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — phosphorylation site and functional outcome established but primarily by single lab, single publication methods\",\n      \"pmids\": [\"33013689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cocaine acutely activates SIK1 by phosphorylation at Thr-182, accompanied by nuclear import of SIK1. Nuclear SIK1 then phosphorylates HDAC5, causing shuttling of phospho-HDAC5 from nucleus to cytoplasm of striatal cells, leading to MEF2C induction. SIK1 activation also causes nuclear-to-cytoplasm translocation of TORC1/3.\",\n      \"method\": \"In vivo rat cocaine treatment, phospho-Thr182-SIK1 immunostaining, subcellular fractionation, HDAC5 phosphorylation assays, MEF2C gene expression analysis\",\n      \"journal\": \"Synapse (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo model with multiple biochemical and localization readouts; single lab but orthogonal methods\",\n      \"pmids\": [\"21954104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"De novo SIK1 mutations outside the kinase domain cause developmental epilepsies. Mutant SIK1 proteins retain autophosphorylation and kinase activity toward HDAC5, but truncated forms are resistant to degradation and show altered subcellular localization compared to wild-type SIK1.\",\n      \"method\": \"In vitro kinase assays (autophosphorylation and HDAC5 substrate), subcellular localization imaging, neuropathological examination of human SIK1 mutation cases\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay combined with localization imaging and human neuropathology; single study but multiple orthogonal methods\",\n      \"pmids\": [\"25839329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIK1 phosphorylates the co-repressor SMRT at Thr1391, which promotes SMRT/NCoR association with TBL1/TBLR1 and disrupts β-catenin's binding to the TBL1/TBLR1 complex, thereby inhibiting Wnt/β-catenin transcriptional activity in HCC. A non-phosphorylatable SMRT-T1391A mutant reverses this effect.\",\n      \"method\": \"Immunoprecipitation, in vitro kinase assay, luciferase reporter assay, chromatin immunoprecipitation, xenograft tumor models, SMRT-T1391A rescue experiments\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay identifying substrate and phosphorylation site combined with Co-IP, mutant rescue, and in vivo xenograft confirmation\",\n      \"pmids\": [\"26778753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIK1 physically interacts with and phosphorylates the C-terminal cytoplasmic domain of SR-B1 (scavenger receptor class B type 1), specifically at Ser496. This phosphorylation is critical for SIK1 stimulation of selective HDL-cholesteryl ester (CE) uptake and SR-B1-mediated steroidogenesis in adrenal cells. Both intact SIK1 catalytic activity and PKA-mediated phosphorylation of SIK1 are required for this effect.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, Ser496 mutagenesis, HDL-BODIPY-CE uptake assay, SIK1 knockdown/overexpression in adrenal cells\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis of phosphorylation site, Co-IP, and functional CE uptake assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"26567857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIK1 expression is regulated by and inhibited by cAMP signaling via induction of CRTC2: SIK1 represses StAR transcription/splicing through phosphorylation of CRTC2, but only as cAMP levels decline, providing negative feedback on steroidogenic gene expression in adrenal/testis cells.\",\n      \"method\": \"FISH-based single-cell visualization of StAR pRNA and mRNA, SIK1 overexpression/knockdown in Y1 adrenal and MA10 testis cells, qPCR\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel single-cell FISH visualization combined with genetic manipulation; single lab, two methods\",\n      \"pmids\": [\"25662274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SIK1 is recruited to DNA replication sites via interaction with the GINS complex component Sld5. SIK1 phosphorylates MCM2 at five conserved N-terminal residues, which is essential for MCM helicase activation. SIK1 depletion causes defective DNA replication.\",\n      \"method\": \"Co-immunoprecipitation (Sld5-SIK1 interaction), in vitro kinase assay (MCM2 phosphorylation), SIK1 knockdown DNA replication assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vitro kinase assay plus loss-of-function phenotype; single lab, three orthogonal methods\",\n      \"pmids\": [\"27592030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RNF2 acts as an E3 ubiquitin ligase that directly interacts with SIK1 and targets it for proteasomal degradation in hepatocellular carcinoma. Downregulation of RNF2 restores SIK1 levels and inhibits HCC cell growth.\",\n      \"method\": \"Co-immunoprecipitation, RNF2 knockdown rescue experiments, xenograft tumor models\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP establishing physical interaction and genetic rescue confirming E3 ligase role; single lab\",\n      \"pmids\": [\"27911266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SIK1 suppresses NF-κB signaling in microglia: SIK1 knockdown promotes alcohol-induced NF-κB activity and increases caspase-3/9-mediated apoptosis in microglia, whereas SIK1 expression reduces NF-κB signaling. NF-κB inhibition (p65 depletion) reverses SIK1 knockdown-mediated apoptosis.\",\n      \"method\": \"SIK1 knockdown, NF-κB luciferase reporter assay, TUNEL staining, caspase activity assays, cell fluorescence staining\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis via p65 knockdown rescue combined with reporter assay and apoptosis measurements; single lab\",\n      \"pmids\": [\"29929190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIK1 and SIK3 are critical downstream effectors of LKB1 tumor suppressor function in NSCLC. Conditional genetic loss of Sik1 increased tumor growth in Kras-driven lung cancer mouse models, enhanced by Sik3 co-deletion. The SIK substrate CRTC2 was required for the proliferative benefit of SIK loss and for upregulation of AP1 and IL6 signaling.\",\n      \"method\": \"CRISPR-based genetic deletion in cell lines, conditional Sik1 knockout mouse models of Kras lung cancer, gene-expression analysis, CRTC2 epistasis experiments\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR in cell lines plus conditional knockout mouse model plus CRTC2 epistasis; multiple orthogonal methods across cell and animal models\",\n      \"pmids\": [\"31350328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIK1 phosphorylation at Ser577 (a PKA site) negatively regulates sleep: mice with Sik1-S577A mutation (loss of PKA phosphorylation site) showed shorter wake time, longer NREM sleep, and higher NREM delta density, indicating PKA-SIK1 signaling is involved in sleep need regulation.\",\n      \"method\": \"Sik1S577A knock-in mice generated by genome editing, polysomnographic sleep recording, sleep deprivation experiments\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knock-in with defined in vivo sleep phenotype; single lab with well-controlled electrophysiological readout\",\n      \"pmids\": [\"32457359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIK1 activates PDE4, leading to reduced cAMP accumulation and inhibition of the cAMP/PKA/CREB pathway, thereby suppressing hepatic gluconeogenesis. The natural compound phanginin A activates SIK1 via LKB1 phosphorylation, and its effects are blocked by SIK1 knockdown or pan-SIK inhibitor HG-9-91-01.\",\n      \"method\": \"SIK1 siRNA knockdown, SIK1 overexpression, PDE4 activity assays, cAMP measurement, gluconeogenic gene expression, pan-SIK inhibitor HG-9-91-01, ob/ob mouse glucose tolerance assays\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (siRNA, overexpression, PDE4 activity, cAMP measurement, inhibitor) in both primary hepatocytes and in vivo; single lab\",\n      \"pmids\": [\"32599076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"C-terminal truncation mutations of SIK1 (as in ASD/epilepsy patients) alter SIK1 subcellular distribution from exclusively nuclear to both nuclear and cytoplasmic. SIK1-MT mice show increased excitatory synaptic transmission, enhanced pyramidal neuron excitability in mPFC layer 5, disrupted E/I synaptic balance, and increased repetitive behavior.\",\n      \"method\": \"CRISPR/Cas9-generated SIK1 truncation knock-in mice, subcellular localization imaging, electrophysiology (excitatory and inhibitory synaptic recordings), behavioral assays\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knock-in with subcellular localization imaging and electrophysiology; single lab with multiple readouts\",\n      \"pmids\": [\"34295222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BMI1 directly binds the SIK1 promoter in a complex with RING1B, promoting H2AK119 monoubiquitination and inhibiting H3K4me3, resulting in transcriptional repression of SIK1 in osteosarcoma cells.\",\n      \"method\": \"ChIP-qPCR at SIK1 promoter for BMI1, RING1B, H2AK119ub, and H3K4me3; SIK1 rescue experiments in BMI1-deficient cells; xenograft models\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR demonstrating direct promoter binding plus functional rescue; single lab\",\n      \"pmids\": [\"35346195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AKT binds SIK1 and phosphorylates it, relieving SIK1-mediated repression of STAT3 in a phosphorylation-dependent manner. AKT-phosphorylated SIK1 interacts with 14-3-3, translocates to the cytoplasm, and is then facilitated by the isomerase Pin1 to interact with E3 ligase ITCH, leading to SIK1 ubiquitination and degradation.\",\n      \"method\": \"Mass spectrometry-based interactome analysis, Co-immunoprecipitation (AKT-SIK1, SIK1-14-3-3, SIK1-Pin1, SIK1-ITCH), subcellular fractionation, phosphorylation assays, ubiquitination assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based interactome plus reciprocal Co-IPs plus ubiquitination assay plus localization; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"36806887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SIK1 interacts with Smad7 (validated by co-immunoprecipitation) and inhibits phosphorylation of Smad2, suppressing TGF-β/Smad signaling and downstream EMT markers in colorectal cancer cells.\",\n      \"method\": \"Co-immunoprecipitation (SIK1-Smad7), phospho-Smad2 immunoblotting, SIK1 overexpression/knockdown, galunisertib (TGF-β inhibitor) rescue\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP for binding plus functional phosphorylation readout; single lab with epistasis using TGF-β inhibitor\",\n      \"pmids\": [\"37670972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SIK1 suppresses gluconeogenic gene transcription by inducing phosphorylation, K48-linked polyubiquitination and proteasomal degradation of CRTC1. Phosphorylation occurs at S155, S167, S188 and S346 of CRTC1. This ubiquitination is mediated by the E3 ligase RFWD2. SIK2 and SIK3 do not replicate this effect on CRTC1.\",\n      \"method\": \"SIK1/2/3 overexpression comparison, CRTC1 phosphomutant analysis, ubiquitination assays, RFWD2 co-expression, gluconeogenic gene reporter assays\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mapping, ubiquitination assay, RFWD2 identification; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"29408765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Lack of SIK1 in mouse embryonic stem cells impairs cardiomyogenesis: in SIK1-null ES-derived embryoid bodies, temporal appearance of cardiomyocytes is delayed. Expression profiling revealed SIK1 controls a genetic network involving the cyclin-dependent kinase inhibitor p57(Kip2) to regulate cardiomyoblast cell cycle exit.\",\n      \"method\": \"Gene-trap SIK1-null ES cells, embryoid body differentiation assay, gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — null ES cell model with differentiation phenotype and transcriptomics; single lab, two orthogonal readouts\",\n      \"pmids\": [\"20140255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIK1 knockout mice on a chronic high-salt diet develop increased systolic blood pressure, upregulated TGF-β1 signaling, increased endothelin-1, and vascular smooth muscle cell contractile marker expression. SIK1 knockdown in vitro upregulates collagen in adventitial fibroblasts and contractile markers in VSMCs, establishing SIK1 as a regulator of VSMC phenotype via TGF-β1 inhibition.\",\n      \"method\": \"SIK1 knockout mice with high-salt challenge, SIK1 in vitro knockdown in VSMCs and fibroblasts, blood pressure monitoring, TGF-β1 signaling assays\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse phenotype with in vitro mechanistic follow-up; single lab, two orthogonal models\",\n      \"pmids\": [\"25556206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gastrin induces SIK1 expression through Gq/G11-coupled CCK2 receptor signaling, and SIK1 induction is negatively regulated by ICER. Gastrin activates LKB1 at Ser-428 and SIK1 at Thr-182. Ectopic SIK1 increases gastrin-induced HDAC4 phosphorylation and nuclear export of HDACs. SIK1 knockdown increases migration of gastric adenocarcinoma cells.\",\n      \"method\": \"SIK1 siRNA knockdown, phospho-HDAC4 immunoblotting, HDAC nuclear export assay, luciferase reporter assays, migration assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with multiple functional readouts (migration, HDAC phosphorylation, reporter); single lab\",\n      \"pmids\": [\"25384047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SIK1 phosphorylates HDAC5 at Ser498, promoting HDAC5 interaction with 14-3-3 protein, which protects HDAC5 from TRIM28-mediated ubiquitylation and degradation. SIK1-stabilized HDAC5 deacetylates STAT6, enhancing its transcriptional activity to upregulate SLC7A11 expression, rendering pancreatic cancer cells resistant to ferroptosis.\",\n      \"method\": \"In vitro kinase assay (HDAC5 Ser498 phosphorylation), Co-immunoprecipitation (HDAC5-14-3-3, HDAC5-TRIM28), ubiquitination assay, STAT6 acetylation assays, organoid and PDX models\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with substrate site mapping, Co-IP, ubiquitination assay, and functional PDX model; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"40250791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FTO-mediated m6A demethylation at the 3'-UTR of SIK1 mRNA reduces SIK1 expression and mRNA stability in trophoblasts under hyperglycemic conditions. Decreased SIK1 impairs placental cytotrophoblast syncytialization in type 2 diabetes mellitus.\",\n      \"method\": \"MeRIP-Seq and RNA-Seq combined analysis, FTO binding to SIK1 3'-UTR m6A site, mRNA stability assays, trophoblast syncytialization functional assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combined MeRIP-Seq/RNA-Seq with FTO binding and mRNA stability assays and functional syncytialization readout; single lab\",\n      \"pmids\": [\"38883837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SIK1 (snf1lk/msk) is expressed in skeletal muscle progenitor cells and early cardiomyocytes. Inducible expression of the SIK1 kinase domain in CHO cells blocks cell division and causes extra rounds of DNA replication to yield 8N and 16N cells, suggesting a role in G2/M cell cycle regulation.\",\n      \"method\": \"Tetracycline-inducible SNF1LK kinase domain expression in CHO cells, flow cytometric DNA content analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single overexpression experiment in a heterologous cell line with no mechanistic substrate identification\",\n      \"pmids\": [\"15177563\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SIK1 is an AMPK-family serine/threonine kinase activated by LKB1 (which phosphorylates Thr182) and calcium/calmodulin-dependent kinases (Thr322), and further stabilized by PKA-mediated phosphorylation (Thr475/Ser577); once active, it phosphorylates class II HDACs (HDAC4/5 at conserved sites) to drive their nuclear export and MEF2-dependent gene expression, phosphorylates CRTC/TORC coactivators (CRTC1/2) to suppress CREB-dependent gluconeogenic and steroidogenic transcription, phosphorylates SMRT-T1391 to inhibit Wnt/β-catenin signaling, phosphorylates SR-B1-Ser496 to enhance cholesterol uptake, phosphorylates PME-1 to activate Na+,K+-ATPase in response to sodium sensing, and phosphorylates MCM2 to activate the replication helicase; SIK1 is itself negatively regulated by AKT-mediated phosphorylation (promoting 14-3-3 binding, cytoplasmic translocation, and ITCH-dependent ubiquitination/degradation), by RNF2-mediated ubiquitination, and by BMI1-mediated epigenetic repression of its promoter, positioning SIK1 as a central tumor-suppressive kinase that integrates cAMP, calcium, and energy signals to control gene transcription, metabolism, circadian entrainment, and cellular survival.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SIK1 is an LKB1-activated, AMPK-family serine/threonine kinase that integrates cAMP, calcium, and energy signals to control gene transcription, metabolism, and cell fate, functioning broadly as a tumor-suppressive node [#3, #15]. Its activation requires LKB1-mediated phosphorylation at Thr182 followed by Ser186 autophosphorylation, with sustained activity dependent on sequential GSK-3\\u03b2 phosphorylation [#2]; in distinct contexts calcium/calmodulin-dependent kinase activates SIK1 at Thr322 [#1], and PKA phosphorylation at Thr475 within a PEST domain stabilizes the protein against proteasomal degradation [#4]. A core transcriptional output of SIK1 is phosphorylation of CRTC/TORC coactivators (CRTC1 at multiple sites, CRTC2 at Ser171), driving their cytoplasmic sequestration or RFWD2-mediated degradation to repress CREB-dependent gluconeogenic and steroidogenic gene programs [#6, #22, #11]; SIK1 reinforces this by activating PDE4 to lower cAMP [#17]. SIK1 also phosphorylates class II HDACs (HDAC4/HDAC5) to drive their 14-3-3-dependent nuclear export and MEF2 activation, coupling cAMP/PKA signaling to myogenic differentiation [#2, #4, #25]. SIK1 participates in a CREB-driven negative feedback loop that limits light-induced circadian phase shifts in the SCN through CRTC1 deactivation [#5]. Beyond transcription, SIK1 phosphorylates PME-1 to activate Na+,K+-ATPase upon sodium/calcium sensing [#1], phosphorylates MCM2 after recruitment by the GINS subunit Sld5 to license DNA replication [#12], phosphorylates SMRT at Thr1391 to inhibit Wnt/\\u03b2-catenin signaling [#9], and phosphorylates SR-B1 at Ser496 to promote HDL-cholesterol uptake [#10]. SIK1 is opposed by AKT, which phosphorylates it to promote 14-3-3 binding, cytoplasmic translocation, and Pin1/ITCH-dependent ubiquitination and degradation [#20], by the E3 ligase RNF2 [#13], and by BMI1/RING1B-mediated epigenetic silencing of its promoter [#19]. De novo C-terminal SIK1 mutations that escape degradation and alter nuclear localization cause developmental epilepsy and autism-spectrum phenotypes [#8, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Initial characterization asked where SIK1 acts and what cellular process it influences, establishing an early link to cell cycle control.\",\n      \"evidence\": \"Inducible SIK1 kinase domain expression in CHO cells with flow cytometric DNA content analysis\",\n      \"pmids\": [\"15177563\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single overexpression in a heterologous line with no substrate identified\", \"Does not establish a physiological cell-cycle role\", \"Mechanism of the polyploidy phenotype undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established SIK1 as a class II HDAC kinase downstream of CREB, defining the HDAC5-MEF2 transcriptional axis in muscle.\",\n      \"evidence\": \"Dominant-negative CREB mice, viral SIK1 re-expression, and HDAC antagonist rescue of dystrophic phenotype\",\n      \"pmids\": [\"17468767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Activation inputs not fully resolved at this stage\", \"HDAC5 site specificity not mapped here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a calcium-triggered activation route and a non-transcriptional substrate, showing SIK1 couples sodium sensing to ion-pump regulation.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays, and intracellular Ca2+/Na+ measurements on the Na+,K+-ATPase complex\",\n      \"pmids\": [\"17939993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts beyond cultured cells not defined\", \"Interplay with the LKB1 activation route unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the activation hierarchy of SIK1, placing LKB1-Thr182, Ser186 autophosphorylation, and GSK-3\\u03b2 in a defined sequence.\",\n      \"evidence\": \"In vitro kinase assays with purified GSK-3\\u03b2 plus inhibitor and nuclear-export readouts in C2C12\",\n      \"pmids\": [\"18946175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each phospho-event to activity unclear\", \"Tissue-specificity of GSK-3\\u03b2 input untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed SIK1 in the LKB1 tumor-suppressor pathway, linking it to p53-dependent anoikis and metastasis suppression.\",\n      \"evidence\": \"Kinome-wide RNAi screen, in vivo metastasis model, and combinatorial-knockdown epistasis\",\n      \"pmids\": [\"19622832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SIK1 substrate connecting to p53 not identified\", \"Generality across tumor types not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Implicated SIK1 in developmental cell-cycle exit, showing it controls a p57Kip2 network during cardiomyogenesis.\",\n      \"evidence\": \"Gene-trap SIK1-null ES cells, embryoid body differentiation, and expression profiling\",\n      \"pmids\": [\"20140255\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate linking SIK1 to p57Kip2 not defined\", \"In vivo developmental requirement not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated stimulus-coupled SIK1 activation in vivo, with cocaine driving Thr182 phosphorylation, nuclear import, and HDAC5/CRTC shuttling.\",\n      \"evidence\": \"In vivo rat cocaine treatment with phospho-SIK1 immunostaining, fractionation, and MEF2C readouts\",\n      \"pmids\": [\"21954104\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream kinase driving Thr182 in this context not pinned down\", \"Behavioral consequences not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Explained how cAMP/PKA stabilizes SIK1, identifying Thr475 in a PEST domain as the degradation-protective PKA site coupling SIK1 to myogenesis.\",\n      \"evidence\": \"Cell-free PKA assay, proteasome inhibition, PEST mutagenesis, and knockdown in myogenic progenitors\",\n      \"pmids\": [\"23256157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the degrading E3 ligase not addressed here\", \"Stoichiometry of stabilization not quantified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined SIK1 as a circadian feedback brake, with CREB-induced SIK1 deactivating CRTC1 to limit light-induced phase shifts.\",\n      \"evidence\": \"Light-regulated SCN transcriptomics, in vivo SCN Sik1 knockdown, and behavioral phase-shift assays\",\n      \"pmids\": [\"23993098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular timing of the feedback loop not fully kinetically resolved\", \"Relevance to peripheral clocks untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped the CRTC2 phosphorylation site (Ser171) underlying SIK1 suppression of hepatic gluconeogenic transcription.\",\n      \"evidence\": \"SIK1 overexpression/knockdown in hepatocytes with phospho-CRTC2 blotting and gluconeogenic reporters\",\n      \"pmids\": [\"33013689\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab methods\", \"In vivo glycemic relevance not directly tested here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected receptor signaling to SIK1, showing gastrin via CCK2/Gq induces and activates SIK1 to drive HDAC4 export and restrain cancer cell migration.\",\n      \"evidence\": \"siRNA knockdown, phospho-HDAC4 blotting, HDAC export and migration assays in gastric cells\",\n      \"pmids\": [\"25384047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HDAC4 site not mapped\", \"ICER regulatory loop only partially defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded the SIK1 substrate repertoire and tumor-suppressor scope: SMRT-Thr1391 phosphorylation inhibits Wnt/\\u03b2-catenin, SR-B1-Ser496 promotes cholesterol uptake, and CRTC2 mediates steroidogenic feedback.\",\n      \"evidence\": \"In vitro kinase assays, Co-IP, mutant rescue, reporter/ChIP, xenografts, and cholesterol uptake/FISH assays\",\n      \"pmids\": [\"26778753\", \"26567857\", \"25662274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cross-talk between these substrate arms not integrated\", \"Tissue-selectivity of substrate choice unexplained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked SIK1 to human disease, identifying de novo C-terminal mutations causing developmental epilepsy with retained kinase activity but altered stability and localization.\",\n      \"evidence\": \"In vitro kinase/autophosphorylation assays, localization imaging, and human neuropathology\",\n      \"pmids\": [\"25839329\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal neuronal mechanism not resolved in this study\", \"Genotype-phenotype range incomplete\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established a cardiovascular role, with SIK1 restraining TGF-\\u03b21 signaling and VSMC contractile phenotype under salt stress.\",\n      \"evidence\": \"SIK1 knockout mice on high-salt diet with in vitro VSMC/fibroblast knockdown and blood pressure monitoring\",\n      \"pmids\": [\"25556206\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate in TGF-\\u03b21 pathway not identified\", \"Single-lab model\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a replication-licensing function, with Sld5-mediated recruitment enabling SIK1 phosphorylation of MCM2 to activate the helicase.\",\n      \"evidence\": \"Co-IP, in vitro MCM2 kinase assay, and SIK1 knockdown replication assays\",\n      \"pmids\": [\"27592030\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How SIK1 activity is timed to S phase unclear\", \"Independent confirmation of MCM2 site needed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified RNF2 as an E3 ligase degrading SIK1 in hepatocellular carcinoma, defining a route of tumor-promoting SIK1 loss.\",\n      \"evidence\": \"Co-IP, RNF2 knockdown rescue, and xenograft models\",\n      \"pmids\": [\"27911266\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degron and ubiquitination sites on SIK1 not mapped\", \"Single-lab Co-IP evidence\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Distinguished SIK1 from paralogs in metabolic control, showing SIK1-specific induction of CRTC1 phosphorylation and RFWD2-mediated degradation to repress gluconeogenesis.\",\n      \"evidence\": \"SIK1/2/3 comparison, CRTC1 phosphomutant analysis, ubiquitination assays, and RFWD2 co-expression\",\n      \"pmids\": [\"29408765\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of CRTC1 degradation untested here\", \"Why only SIK1 acts on CRTC1 unexplained\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended SIK1's anti-inflammatory and pro-survival role, showing it suppresses NF-\\u03baB and apoptosis in microglia.\",\n      \"evidence\": \"SIK1 knockdown, NF-\\u03baB reporter, TUNEL/caspase assays, and p65-depletion epistasis\",\n      \"pmids\": [\"29929190\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SIK1 substrate in NF-\\u03baB pathway not identified\", \"Tier 3 single-lab evidence\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Confirmed in vivo that SIK1 (with SIK3) mediates LKB1 tumor suppression in lung cancer through CRTC2-dependent AP1/IL6 signaling.\",\n      \"evidence\": \"CRISPR deletion, conditional Sik1 knockout Kras lung cancer mice, and CRTC2 epistasis\",\n      \"pmids\": [\"31350328\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of SIK1 versus SIK3 not fully separated\", \"Therapeutic implications of restoring SIK activity not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Added effector and physiological dimensions: SIK1 activates PDE4 to lower cAMP and suppress gluconeogenesis, and PKA-Ser577 phosphorylation links SIK1 to sleep-need regulation.\",\n      \"evidence\": \"siRNA/overexpression with PDE4 activity and cAMP assays in hepatocytes/ob-ob mice; Sik1-S577A knock-in mice with polysomnography\",\n      \"pmids\": [\"32599076\", \"32457359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which SIK1 activates PDE4 not detailed\", \"Neural circuit mediating the sleep effect undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mechanistically connected SIK1 C-terminal truncations to neuronal dysfunction, showing mislocalization and disrupted excitatory/inhibitory balance with autism-like behavior.\",\n      \"evidence\": \"CRISPR truncation knock-in mice, localization imaging, electrophysiology, and behavioral assays\",\n      \"pmids\": [\"34295222\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal substrate driving the synaptic phenotype not identified\", \"Single-lab model\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined the dominant negative-regulatory axis: AKT phosphorylates SIK1 to recruit 14-3-3, drive cytoplasmic translocation, and trigger Pin1/ITCH-dependent degradation, relieving SIK1 repression of STAT3.\",\n      \"evidence\": \"MS interactome, reciprocal Co-IPs, fractionation, phosphorylation, and ubiquitination assays\",\n      \"pmids\": [\"36806887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AKT phosphosite(s) on SIK1 not specified here\", \"Reconciliation with PKA-stabilization not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Added a TGF-\\u03b2 axis to SIK1's tumor-suppressive repertoire via Smad7 interaction and inhibition of Smad2 phosphorylation in colorectal cancer.\",\n      \"evidence\": \"Single Co-IP (SIK1-Smad7), phospho-Smad2 blotting, and galunisertib rescue\",\n      \"pmids\": [\"37670972\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"Whether SIK1 directly phosphorylates a Smad component unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed epigenetic suppression of SIK1, with BMI1/RING1B repressing its promoter via H2AK119ub and H3K4me3 loss in osteosarcoma.\",\n      \"evidence\": \"ChIP-qPCR at the SIK1 promoter, SIK1 rescue in BMI1-deficient cells, and xenografts\",\n      \"pmids\": [\"35346195\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream signals controlling BMI1 recruitment unknown\", \"Single-lab evidence\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed post-transcriptional control of SIK1, with FTO-mediated m6A demethylation reducing SIK1 mRNA stability and impairing trophoblast syncytialization in diabetes.\",\n      \"evidence\": \"MeRIP-Seq/RNA-Seq, FTO binding to the SIK1 3'-UTR, mRNA stability and syncytialization assays\",\n      \"pmids\": [\"38883837\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream SIK1 substrate in syncytialization not defined\", \"Single-lab evidence\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a context-specific oncogenic output, with SIK1 phosphorylating HDAC5-Ser498 to stabilize it via 14-3-3, deacetylate STAT6, and confer ferroptosis resistance through SLC7A11.\",\n      \"evidence\": \"In vitro kinase assay, Co-IP, ubiquitination and STAT6 acetylation assays, organoid and PDX models\",\n      \"pmids\": [\"40250791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of this oncogenic role with SIK1 tumor suppression unresolved\", \"Tissue determinants of pro- versus anti-tumor output unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how SIK1 substrate selection and its dual tumor-suppressive versus oncogenic outputs are determined across tissues, and how competing PKA-stabilizing and AKT-destabilizing inputs are integrated in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of context-dependent substrate choice\", \"Integration of opposing stability inputs untested in vivo\", \"Structural basis of substrate recognition undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 6, 9, 10, 12, 22, 26]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 2, 6, 9, 10, 12, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 5, 6, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 8, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 18, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 6, 17, 20]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 5, 6, 9, 22]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 10, 17, 22]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 13, 15, 19, 26]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\"Na+,K+-ATPase regulatory complex\"],\n    \"partners\": [\"LKB1\", \"CRTC2\", \"CRTC1\", \"HDAC5\", \"Sld5\", \"RNF2\", \"ITCH\", \"Smad7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}