{"gene":"SNAI1","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2012,"finding":"SNAI1 interacts with G9a (a euchromatin H3K9 methyltransferase) and recruits G9a and DNA methyltransferases to the E-cadherin (CDH1) promoter, leading to H3K9me2 and subsequent DNA methylation to repress E-cadherin expression during EMT.","method":"Co-immunoprecipitation, ChIP, G9a knockdown with rescue experiments, in vitro and in vivo breast cancer models","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, functional KD with defined molecular phenotype, replicated across multiple cell lines","pmids":["22406531"],"is_preprint":false},{"year":2013,"finding":"Collagen I receptor DDR2 stabilizes SNAIL1 by activating ERK2 (in a Src-dependent manner), which directly phosphorylates SNAIL1, leading to SNAIL1 nuclear accumulation, reduced ubiquitylation, and increased protein half-life.","method":"In vitro kinase assay, cycloheximide chase, co-immunoprecipitation, mutagenesis, xenograft metastasis models","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct phosphorylation demonstrated in vitro, protein stability and localization assays, in vivo validation","pmids":["23644467"],"is_preprint":false},{"year":2011,"finding":"Lats2 kinase interacts with SNAIL1 and directly phosphorylates it at residue T203 in the nucleus, retaining SNAIL1 in the nucleus and enhancing its stability and EMT-inducing activity.","method":"Kinome RNAi screen, in vitro kinase assay, bioluminescence-based live-cell screen, mouse and zebrafish embryo models","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro phosphorylation, site-specific mutagenesis, confirmed in vivo in two model organisms","pmids":["21952048"],"is_preprint":false},{"year":2006,"finding":"SNAIL1 protein binds to an E-box in its own promoter (at -146 relative to transcription start) and represses its own transcription, establishing a negative feedback loop controlling SNAIL1 expression.","method":"ChIP, promoter-reporter assays, E-box mutagenesis, ectopic expression studies","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP of endogenous protein, mutagenesis, reporter assays with multiple controls","pmids":["16617148"],"is_preprint":false},{"year":2013,"finding":"SNAIL1 zinc fingers ZF1 and ZF2 are specifically required for efficient binding to E-cadherin promoter E2-boxes and for EMT induction, whereas SNAIL2 requires ZF3 or ZF4 for these functions.","method":"Structural modeling, mutational analysis of individual zinc fingers, DNA binding assays, functional EMT assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with DNA binding and functional assays","pmids":["24297167"],"is_preprint":false},{"year":2019,"finding":"aPKC kinases (PAR complex) phosphorylate SNAIL1 at S249 under conditions of intact apical-basal polarity, promoting SNAIL1 protein degradation; loss of polarity prevents this phosphorylation and stabilizes SNAIL1 to promote EMT.","method":"3D organoid cultures, aPKC kinase assays, site-directed mutagenesis (S249), xenograft tumor models, human breast tissue correlation","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct phosphorylation site identified, mutagenesis, multiple cellular and in vivo models","pmids":["30804505"],"is_preprint":false},{"year":2011,"finding":"SNAIL1 controls the expression of ZEB1 during TGF-β-induced EMT by multiple mechanisms: depletion of SNAIL1 prevents ZEB1 mRNA and protein upregulation, SNAIL1 is required for nuclear translocation of Ets1 (which binds the proximal ZEB1 promoter), and SNAIL1 cooperates with Twist for maximal ZEB1 transcription.","method":"siRNA knockdown, co-transfection assays, TGF-β treatment time-course, ChIP for Twist/Ets1 binding to ZEB1 promoter","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, defined pathway epistasis with promoter binding validation","pmids":["21317430"],"is_preprint":false},{"year":2008,"finding":"HMGA2 directly binds the SNAIL1 promoter and cooperates with TGF-β/Smad signaling to regulate SNAIL1 gene expression; physical interaction between HMGA2 and Smads increases Smad binding to the SNAIL1 promoter.","method":"ChIP, co-immunoprecipitation, promoter-reporter assays, SNAIL1 knockdown rescue experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — ChIP demonstrating direct promoter binding, Co-IP for physical interaction, functional rescue","pmids":["18832382"],"is_preprint":false},{"year":2017,"finding":"Dub3 is a deubiquitinase that interacts with and stabilizes SNAIL1 by removing ubiquitin modifications; IL-6 induces Dub3 expression, which prevents SNAIL1 degradation, and inhibitor WP1130 binds Dub3 to block this stabilization.","method":"Co-immunoprecipitation, ubiquitination assay, in vitro deubiquitinase assay, shRNA knockdown, ectopic rescue, in vivo metastasis models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct enzymatic activity demonstrated, Co-IP, multiple in vitro/in vivo models with rescue","pmids":["28198361"],"is_preprint":false},{"year":2018,"finding":"USP27X is a deubiquitinase that stabilizes SNAIL1 protein; USP27X is upregulated by TGF-β during EMT and is required for TGF-β-induced SNAIL1 expression and EMT in epithelial cells and cancer-associated fibroblasts.","method":"siRNA screen, Co-immunoprecipitation, ubiquitination assays, cell migration/invasion assays, in vivo metastasis models","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — screen-identified, confirmed by Co-IP, enzymatic assay, multiple functional readouts","pmids":["30341066"],"is_preprint":false},{"year":2013,"finding":"FBXL5 is a nuclear ubiquitin ligase that interacts with SNAIL1, promoting its polyubiquitination; this impairs SNAIL1 DNA binding and leads to cytosolic proteasomal degradation. Lats2 phosphorylation of SNAIL1 prevents nuclear export but not polyubiquitination by FBXL5.","method":"shRNA screening, Co-immunoprecipitation, ubiquitination assay, DNA binding assay, iron depletion and γ-irradiation stress experiments","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — mechanistic dissection with Co-IP, ubiquitination assay, DNA binding, and kinase crosstalk","pmids":["24157836"],"is_preprint":false},{"year":2011,"finding":"PARP-1 poly(ADP-ribosyl)ates SNAIL1 both in vitro and in vivo, and this modification (along with PARP-1 interaction) controls SNAIL1 protein stability; PARP inhibition reduces SNAIL1 protein levels and impairs EMT.","method":"In vitro and in vivo PAR assay, Co-immunoprecipitation, PARP-1 knockdown and inhibitor studies, EMT phenotype assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro and in vivo modification assay with defined enzyme (PARP-1 not PARP-2), functional consequences shown","pmids":["21577210"],"is_preprint":false},{"year":2015,"finding":"SNAIL1 interacts with the LSD1-CoREST histone demethylase complex (via HMG20A), and HMG20A is required for SNAIL1-dependent repression of epithelial genes; HMG20A-depleted cells show reduced LSD1 binding to epithelial gene promoters and increased H3K4 methylation.","method":"Co-immunoprecipitation, ChIP, transcriptomics, knockdown studies, TGF-β-induced EMT assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — Co-IP, ChIP, transcriptomic validation, functional rescue in multiple models","pmids":["25639869"],"is_preprint":false},{"year":2019,"finding":"UDP-glucose directly inhibits the association of HuR with SNAI1 mRNA, leading to SNAI1 mRNA degradation; EGFR-activated UGDH phosphorylation at Y473 converts UDP-glucose to UDP-glucuronic acid, attenuating UDP-glucose-mediated inhibition and thereby stabilizing SNAI1 mRNA to promote EMT.","method":"In vitro RNA-protein binding assays, UGDH phosphorylation mutagenesis, RNA stability assays, lung cancer cell and in vivo metastasis models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical reconstitution of UDP-glucose/HuR/SNAI1 mRNA interaction, mutagenesis, in vivo validation","pmids":["31243371"],"is_preprint":false},{"year":2019,"finding":"p38 MAPK directly phosphorylates SNAIL1 at Ser107, and this suppresses DYRK2-mediated Ser104 phosphorylation that is required for GSK3β-dependent SNAIL1 phosphorylation and βTrCP-mediated ubiquitination and degradation, thereby stabilizing SNAIL1.","method":"In vitro kinase assays, site-directed mutagenesis, ubiquitination assays, ovarian cancer functional studies","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 — in vitro phosphorylation at defined site, mechanistic epistasis with DYRK2/GSK3β/βTrCP degradation pathway","pmids":["31209060"],"is_preprint":false},{"year":2009,"finding":"SNAIL1 is required for normal mesenchymal cell function: Snail1-deficient fibroblasts show defects in MT1-MMP-dependent 3D invasive activity and fail to induce angiogenesis on chick chorioallantoic membrane.","method":"Conditional knockout mouse model (Snai1 flox), 3D extracellular matrix invasion assay, gene expression profiling, chorioallantoic membrane assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with specific molecular and cellular phenotypes, in vitro and in vivo readouts","pmids":["19188491"],"is_preprint":false},{"year":2016,"finding":"ECM stiffness activates ROCK, which indirectly increases ERK2 activity via integrin signaling, leading to SNAIL1 nuclear accumulation (avoidance of cytosolic proteasome degradation); nuclear SNAIL1 then drives a fibrogenic response in cancer-associated fibroblasts and influences YAP1 activity.","method":"Stiff matrix culture, ROCK inhibition, ERK2 knockdown, subcellular fractionation, in vivo CAF studies","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — defined signaling pathway from mechanical stimulus to SNAIL1 localization with multiple inhibitor and genetic controls","pmids":["27076520"],"is_preprint":false},{"year":2011,"finding":"HIF-1α and HIF-2α directly bind a hypoxia-response element (HRE) in the SNAI1 promoter and activate SNAI1 gene transcription in response to hypoxia, thereby stimulating EMT and cell migration.","method":"Gel shift assay (EMSA), ChIP, reporter gene analysis with HRE mutation, HIF siRNA knockdown, HIF-ΔODD overexpression","journal":"Molecular cancer research : MCR","confidence":"High","confidence_rationale":"Tier 1-2 — EMSA and ChIP demonstrate direct HIF binding to SNAI1 promoter HRE, functional mutagenesis, gain/loss of function","pmids":["21257819"],"is_preprint":false},{"year":2017,"finding":"SETDB1/ESET, recruited by Smad3, represses SNAIL1 (SNAI1) gene transcription by imposing H3K9 methylation at the SNAI1 gene locus, counteracting H3K9 acetylation promoted by activated Smad3/4 complexes; TGF-β attenuates SETDB1 expression to relieve this repression during EMT.","method":"ChIP, histone modification analysis, siRNA knockdown of SETDB1, TGF-β stimulation, reporter assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — ChIP for histone modifications at SNAI1 locus, Smad3 recruitment shown, mechanistic epistasis with TGF-β pathway","pmids":["29233829"],"is_preprint":false},{"year":2023,"finding":"Lactate induces CBP/p300-mediated lactylation of SNAIL1, stabilizing it and promoting endothelial-to-mesenchymal transition; this is dependent on MCT (monocarboxylate transporter) signaling.","method":"Co-immunoprecipitation, lactylation assay, MCT inhibitor (CHC), MCT1 silencing, in vivo myocardial infarction model","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 — direct lactylation modification shown with writer (CBP/p300), pharmacological and genetic inhibition, in vivo validation","pmids":["36735787"],"is_preprint":false},{"year":2010,"finding":"Tyrosine-phosphorylated p68 RNA helicase activates SNAIL1 transcription by promoting dissociation of HDAC1 from the SNAIL1 promoter; p68 interacts with the NuRD/MBD3:Mi-2 chromatin remodeling complex.","method":"Chromatin immunoprecipitation, co-immunoprecipitation, p68 phosphorylation mutant (Y593), SNAIL1 promoter-reporter assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and Co-IP, single lab with orthogonal methods but mechanistic model partially inferred","pmids":["20676135"],"is_preprint":false},{"year":2015,"finding":"DACH1 specifically interacts with SNAIL1 (not SNAIL2) to form a complex that can bind the E-box on the E-cadherin promoter in a SNAIL1-dependent manner; DACH1 inhibits SNAIL1 transcriptional activity leading to E-cadherin activation.","method":"Co-immunoprecipitation, ChIP, luciferase reporter assays, gain/loss of function, mouse xenograft model","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ChIP, reporter assays, in vivo model; single lab","pmids":["25775416"],"is_preprint":false},{"year":2012,"finding":"CK2 holoenzyme (dependent on the CK2β regulatory subunit) synergistically with GSK3β hierarchically phosphorylates SNAIL1 to negatively regulate its stability; loss of CK2β promotes SNAIL1 induction and EMT.","method":"CK2β depletion in epithelial cells, protein stability assays, kinase inhibition, in vitro phosphorylation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro kinase evidence, functional EMT phenotypes, clinical correlation; single lab","pmids":["22562247"],"is_preprint":false},{"year":2011,"finding":"Notch1 intracellular domain (NICD) binds SNAIL1 and induces its ubiquitination and MDM2-dependent degradation, thereby inhibiting SNAIL1-dependent cancer cell invasion.","method":"Tandem affinity purification/mass spectrometry, Co-immunoprecipitation, subcellular colocalization, invasion assays in HCC cells and mouse embryonic fibroblasts","journal":"BMC biology","confidence":"Medium","confidence_rationale":"Tier 2 — MS interactome confirmed by Co-IP, functional invasion assay; single lab","pmids":["22128911"],"is_preprint":false},{"year":2013,"finding":"SNAIL1 and SNAIL2 proteins bind to E2-box sequences in both their own and each other's promoters during chondrogenesis, providing a cross-regulatory mechanism explaining the genetic redundancy between these two genes.","method":"ChIP on endogenous proteins in differentiating ATDC5 chondrogenic cells, mouse Snai1/Snai2 double conditional knockout genetic analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous ChIP, genetic epistasis confirmation; single lab","pmids":["23665016"],"is_preprint":false},{"year":2016,"finding":"Adipocyte SNAIL1 binds the ATGL (adipose triacylglycerol lipase) promoter to repress its expression; adipocyte-specific Snail1 deletion increases ATGL expression and lipolysis, decreasing fat mass and increasing liver fat content.","method":"Adipocyte-specific conditional knockout mouse, ChIP for SNAIL1 at ATGL promoter, lipolysis assays, metabolic phenotyping","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with clear metabolic phenotype, ChIP demonstrating direct promoter binding, in vivo metabolic validation","pmids":["27851965"],"is_preprint":false},{"year":2017,"finding":"FBXO31 (SCF E3 ligase component) interacts with SNAIL1 and mediates its ubiquitin- and proteasome-dependent degradation; SNAIL1 phosphorylation (by GSK-3β) and the FBXO31 F-box domain are necessary for this interaction.","method":"Co-immunoprecipitation, ubiquitination/proteasome assay, site-specific phosphorylation mutants, in vivo xenograft models","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay, phosphorylation dependence; single lab","pmids":["29117943"],"is_preprint":false},{"year":2021,"finding":"PLAGL2 activates transcription of deubiquitinase USP37, which then directly interacts with and deubiquitinates SNAIL1 protein; GSK-3β-dependent phosphorylation of SNAIL1 is essential for USP37-mediated deubiquitination.","method":"Co-immunoprecipitation, ubiquitination assay, luciferase reporter for USP37 promoter, in vitro and in vivo gastric cancer models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay, phosphorylation dependence; single lab","pmids":["33391500"],"is_preprint":false},{"year":2022,"finding":"USP9X deubiquitinates and stabilizes SNAIL1, promoting EMT, metastasis, and chemoresistance in triple-negative breast cancer; pharmacological inhibition of USP9X with WP1130 destabilizes SNAIL1.","method":"Co-immunoprecipitation, ubiquitination assay, USP9X knockdown/inhibitor, rescue by ectopic SNAIL1, in vivo metastasis models","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 — deubiquitinase activity shown, rescue experiments, in vivo validation; single lab","pmids":["35506169"],"is_preprint":false},{"year":2020,"finding":"USP18 deubiquitinates and stabilizes SNAIL1 protein in colorectal cancer cells, promoting their proliferation, migration, invasion, and EMT.","method":"Co-immunoprecipitation, ubiquitination assay, USP18 overexpression/knockdown, rescue by SNAIL1, functional assays","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and deubiquitination assay; single lab, no in vivo component","pmids":["32742193"],"is_preprint":false},{"year":2023,"finding":"Ribotoxic stress activates the JNK-USP36 signaling axis, which stabilizes SNAIL1 in the nucleolus; nucleolar SNAIL1 facilitates ribosome biogenesis and promotes solid tumor cell survival during ribotoxic stress.","method":"JNK/USP36 signaling inhibition, subcellular fractionation, SNAIL1 nucleolar localization imaging, ribosome biogenesis assays, in vivo tumor models","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — novel nucleolar function with mechanistic epistasis and in vivo confirmation; single lab","pmids":["37833415"],"is_preprint":false},{"year":2021,"finding":"STK39 kinase interacts with and phosphorylates SNAIL1 at T203, which is critical for SNAIL1 nuclear retention and stability, thereby promoting EMT, invasion, and metastasis in breast cancer.","method":"In vitro kinase assay, site-directed mutagenesis (T203), Co-immunoprecipitation, subcellular fractionation, in vivo breast cancer metastasis model","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 — direct phosphorylation at defined site in vitro, mutagenesis, nuclear retention mechanism, in vivo validation","pmids":["34335956"],"is_preprint":false},{"year":2015,"finding":"Bacterial infection induces SNAIL1 expression via the ERK1/2/MAPK signaling cascade and bacterial cell wall components; induced SNAIL1 represses tight junction genes (ZO-1, claudin 5, occludin) at the transcript and protein levels to disrupt the blood-brain barrier.","method":"SNAIL1 siRNA/dominant-negative overexpression, ERK1/2 inhibition, zebrafish infection model, permeability assays, qPCR/Western blot of tight junction components","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function with specific molecular targets, in vitro and in vivo (zebrafish) validation","pmids":["25461453"],"is_preprint":false},{"year":2015,"finding":"LASP-1 directly binds SNAIL1 (possibly stabilizing it) and serves as a nuclear hub assembling the UHRF1-DNMT1-G9a-Snail1 epigenetic complex in a CXCL12-dependent manner.","method":"Co-immunoprecipitation, mass spectrometry of LASP-1 immunoprecipitates, proximity ligation assays, nuclear fractionation, CXCL12 stimulation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP confirmed by proximity ligation; mechanistic consequence of complex partially inferred","pmids":["25982273"],"is_preprint":false},{"year":2018,"finding":"Snail1 represses expression of telomerase gene (TERT) and telomeric repeat-containing RNA (TERRA), and this repression is required for telomere maintenance; Snail1-deficient mouse mesenchymal stem cells show increased TERRA/TERT levels and telomere alterations.","method":"FISH (telomere alterations), TERRA/TERT expression analysis, conditional Snail1 knockout in MSCs, TGFβ-induced EMT correlation, transcriptome analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with specific molecular phenotype (telomere integrity), functional link to TERRA and TERT; single lab","pmids":["29059385"],"is_preprint":false},{"year":2014,"finding":"In colorectal cancer cells, SNAIL1 upregulates LEF1 and employs β-Catenin-LEF1 complexes to redirect Wnt/β-Catenin target gene activity toward pro-invasive and anti-proliferative gene expression; LEF1 accounts for ~35% of SNAIL1-induced transcriptional changes.","method":"Conditional SNAIL1 expression, CRISPR/Cas9 LEF1 knockout and β-Catenin interaction mutant, transcriptome analysis, invasion assays, xenotransplantation","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO and transcriptomics, functional invasion assays; single lab","pmids":["31463973"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, Snail can positively potentiate Twist-mediated enhancer activation; differentially enriched cis-regulatory motifs predict whether Snail represses or activates target genes, with almost 50% of direct targets showing activation.","method":"ChIP-seq for in vivo Snail occupancy, expression profiling of staged snail mutant embryos, enhancer reporter assays, machine learning motif analysis","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq, mutant embryo expression profiling, in vitro and in vivo enhancer assays; Drosophila ortholog","pmids":["24402316"],"is_preprint":false},{"year":2022,"finding":"FTO (m6A demethylase) decreases m6A modification and stability of SNAI1 mRNA; IGF2BP2 acts as an m6A reader binding to the 3' UTR of SNAI1 mRNA to promote its stability, and FTO-mediated downregulation of SNAI1 depends on IGF2BP2.","method":"m6A RNA immunoprecipitation (MeRIP), RIP assay, actinomycin D mRNA stability assay, FTO overexpression/knockdown, in vivo ovarian cancer models","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — MeRIP and RIP demonstrate m6A modification and reader binding; IGF2BP2 dependence shown; single lab","pmids":["36358640"],"is_preprint":false},{"year":2011,"finding":"In NMuMG cells, transient SNAIL1 expression is uniquely required for EMT initiation (E-cadherin downregulation), and SNAIL1 transiently represses Twist1 transcription directly; as SNAIL1 levels decrease, Twist1 is upregulated to sustain late EMT.","method":"RNAi knockdown, transient TGF-β treatment, quantitative gene expression analysis, epistasis experiments in nontumorigenic and cancer cell lines","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 — RNAi epistasis with temporal resolution; direct repression of Twist1 by SNAIL1 shown by reporter; single lab","pmids":["22006115"],"is_preprint":false},{"year":2006,"finding":"Conditional null Snai1 mouse allele created using Cre-loxP system (flanking promoter and first two exons); deletion recapitulates Snai1-null gastrulation defects, establishing the allele for tissue-specific loss-of-function studies.","method":"Conditional knockout generation, Cre-mediated deletion, genetic complementation with null allele","journal":"Genesis","confidence":"Medium","confidence_rationale":"Tier 2 — genetic tool paper with allele validation; foundational for subsequent mechanistic studies","pmids":["16397867"],"is_preprint":false},{"year":2016,"finding":"Snail1 suppresses adipose ATGL expression by binding the ATGL promoter; insulin increases Snail1 levels in adipocytes, linking nutritional state to Snail1-mediated lipolysis regulation.","method":"ChIP for SNAIL1 at ATGL promoter, conditional adipocyte-specific KO, insulin treatment in murine and human adipocytes, lipolysis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP, adipocyte-specific conditional KO with direct metabolic phenotype; multiple orthogonal methods","pmids":["27851965"],"is_preprint":false},{"year":2017,"finding":"Lyn kinase modulates SNAI1 protein localization and stability through the Vav-Rac1-PAK1 pathway; targeting Lyn reduces EMT and metastasis in vitro and in vivo.","method":"Lyn knockdown/inhibition, subcellular fractionation, Vav-Rac1-PAK1 pathway inhibitors, in vivo primary tumor metastasis assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — defined pathway epistasis with localization and stability readouts; single lab","pmids":["28288135"],"is_preprint":false},{"year":2024,"finding":"RHOF promotes c-Myc expression, which drives PKM2 transcription, increasing glycolysis and lactate production; lactate causes lactylation of SNAIL1 and its nuclear translocation, promoting EMT in pancreatic cancer cells.","method":"Western blotting, co-immunoprecipitation, lactylation assay, SNAIL1 nuclear translocation imaging, Snail1 silencing rescue, xenograft mouse model","journal":"Cancer & metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — SNAIL1 lactylation demonstrated, nuclear translocation and functional rescue shown; single lab","pmids":["39462429"],"is_preprint":false},{"year":2014,"finding":"In mouse embryonic stem cells, an endogenous Wnt-mediated burst of SNAIL1 expression during differentiation regulates neuroectodermal fate and is required for epiblast stem cell exit and mesoderm commitment, independent of EMT.","method":"Isogenic conditional knockout ESCs, Wnt stimulation, lineage fate analysis, transcriptome profiling","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with specific lineage phenotypes; novel non-EMT role established; single lab","pmids":["24401905"],"is_preprint":false},{"year":2017,"finding":"NOTCH1 intracellular domain upregulates SNAIL1 expression to increase tumor-propagating cell number in embryonal rhabdomyosarcoma; SNAIL1 blocks muscle differentiation through suppression of the myogenic transcription factor MEF2C.","method":"Zebrafish ERMS transgenic model, SNAIL1 and MEF2C knockdown, tumor transplantation assay, human ERMS cell functional studies","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — defined NOTCH1/SNAI1/MEF2C axis with genetic evidence in zebrafish and human cells; single lab","pmids":["28614716"],"is_preprint":false}],"current_model":"SNAIL1 is a zinc-finger transcriptional repressor (acting through its SNAG domain and C2H2 zinc fingers binding E2-box sequences) that drives EMT by recruiting co-repressor/epigenetic complexes (LSD1-CoREST, G9a/DNMTs, PRC2) to target promoters such as CDH1 (E-cadherin); its activity, subcellular localization, and stability are tightly regulated by a network of phosphorylation events (by GSK3β, ERK2, Lats2, aPKC, p38, STK39, DYRK2), ubiquitination by E3 ligases (β-TrCP, FBXL5, FBXO31), deubiquitination by multiple DUBs (Dub3, USP27X, USP9X, USP18, USP36, USP37), and non-canonical modifications including poly(ADP-ribosyl)ation (by PARP-1) and lactylation (by CBP/p300), collectively determining whether SNAIL1 is retained in the nucleus to repress epithelial genes or exported for proteasomal degradation."},"narrative":{"teleology":[{"year":2006,"claim":"Establishing that SNAI1 auto-represses its own promoter via an E-box revealed a built-in negative feedback loop, raising the question of how SNAI1 expression is dynamically tuned during EMT.","evidence":"ChIP of endogenous SNAI1 at its own promoter E-box, reporter mutagenesis, and ectopic expression in epithelial cells","pmids":["16617148"],"confidence":"High","gaps":["Whether the auto-repressive loop operates in all tissue contexts","Quantitative contribution of auto-repression versus upstream signals to SNAI1 dynamics"]},{"year":2008,"claim":"Identification of HMGA2 and Smad-dependent transcriptional activation of the SNAI1 promoter connected TGF-β signaling directly to SNAI1 gene induction, establishing the upstream pathway for EMT initiation.","evidence":"ChIP and Co-IP showing HMGA2-Smad binding at the SNAI1 promoter, reporter assays, functional rescue","pmids":["18832382"],"confidence":"High","gaps":["Whether HMGA2-Smad cooperativity is tissue-restricted","Relative contribution versus other SNAI1 promoter activators such as HIF"]},{"year":2009,"claim":"Conditional Snail1 knockout in fibroblasts demonstrated that SNAI1 is required for normal mesenchymal cell functions—3D invasion and angiogenesis—extending its role beyond epithelial-to-mesenchymal conversion.","evidence":"Conditional knockout mouse fibroblasts, 3D collagen invasion assay, chorioallantoic membrane angiogenesis assay","pmids":["19188491"],"confidence":"High","gaps":["Whether invasion defects are solely via MT1-MMP or involve additional targets","Mesenchymal transcriptional program governed by SNAI1 beyond identified targets"]},{"year":2011,"claim":"Multiple studies converged to define how SNAI1 protein stability is regulated: Lats2 phosphorylation at T203 retains SNAI1 in the nucleus to enhance EMT, while PARP-1-mediated poly(ADP-ribosyl)ation independently stabilizes SNAI1—establishing that post-translational modifications constitute a critical regulatory layer beyond transcriptional control.","evidence":"In vitro kinase assay (Lats2/T203), in vitro and in vivo PARylation assay (PARP-1), mutagenesis, zebrafish/mouse embryo and EMT cell models","pmids":["21952048","21577210"],"confidence":"High","gaps":["Whether PARylation and T203 phosphorylation act on the same or distinct SNAI1 pools","Structural basis for how T203 phosphorylation blocks nuclear export"]},{"year":2011,"claim":"Demonstration that SNAI1 is required upstream of ZEB1 induction during TGF-β-driven EMT, and transiently represses Twist1, established the temporal hierarchy of EMT transcription factors with SNAI1 acting as the initiator.","evidence":"siRNA epistasis, TGF-β time-course, ChIP for Ets1/Twist at ZEB1 promoter, quantitative expression analysis","pmids":["21317430","22006115"],"confidence":"High","gaps":["Whether the SNAI1→ZEB1 hierarchy is universal across cancer types","Direct versus indirect mechanisms for Ets1 nuclear translocation by SNAI1"]},{"year":2012,"claim":"The discovery that SNAI1 recruits the G9a H3K9 methyltransferase and DNMTs to the CDH1 promoter revealed a dual epigenetic silencing mechanism (histone methylation followed by DNA methylation) explaining stable E-cadherin repression during EMT.","evidence":"Reciprocal Co-IP, ChIP at CDH1 promoter, G9a knockdown with rescue, breast cancer cell lines and xenografts","pmids":["22406531"],"confidence":"High","gaps":["Whether G9a and DNMT recruitment is simultaneous or sequential","Genome-wide extent of SNAI1-G9a co-occupancy beyond CDH1"]},{"year":2013,"claim":"Structural dissection showed ZF1 and ZF2 are specifically required for E2-box binding, and identification of FBXL5 as a nuclear E3 ligase that ubiquitinates SNAI1 to impair DNA binding revealed that SNAI1 can be inactivated in the nucleus before export.","evidence":"Zinc-finger mutagenesis with DNA-binding assays, Co-IP and ubiquitination assays for FBXL5, functional EMT readouts","pmids":["24297167","24157836"],"confidence":"High","gaps":["Whether FBXL5-mediated ubiquitination targets specific SNAI1 lysines","Crystal structure of SNAI1 zinc fingers bound to E2-box DNA"]},{"year":2013,"claim":"ERK2-mediated phosphorylation downstream of collagen receptor DDR2 was shown to stabilize SNAI1 and promote its nuclear accumulation, connecting extracellular matrix signaling to SNAI1 protein fate.","evidence":"In vitro kinase assay, cycloheximide chase, Src-dependence, xenograft metastasis models","pmids":["23665016","23644467"],"confidence":"High","gaps":["Exact ERK2 phosphorylation site(s) on SNAI1","How ERK2 phosphorylation intersects mechanistically with Lats2/T203 and GSK3β pathways"]},{"year":2015,"claim":"HMG20A was identified as a bridging factor connecting SNAI1 to the LSD1-CoREST complex, explaining how SNAI1 recruits histone demethylase activity to maintain H3K4 demethylation at epithelial gene promoters.","evidence":"Co-IP, ChIP showing LSD1 occupancy dependent on HMG20A, H3K4me analysis, TGF-β EMT assays","pmids":["25639869"],"confidence":"High","gaps":["Whether HMG20A is required at all SNAI1 target loci or only a subset","Direct versus indirect interaction between SNAI1 and LSD1"]},{"year":2016,"claim":"Discovery that SNAI1 directly represses ATGL in adipocytes, regulated by insulin, expanded SNAI1 function beyond EMT into metabolic regulation of lipolysis.","evidence":"Adipocyte-specific conditional knockout, ChIP at ATGL promoter, lipolysis and metabolic phenotyping","pmids":["27851965"],"confidence":"High","gaps":["Full set of metabolic gene targets of SNAI1 in adipocytes","Whether the SNAG-domain co-repressor complexes used in EMT are the same ones used at ATGL"]},{"year":2017,"claim":"Identification of Dub3 as an IL-6-induced deubiquitinase that stabilizes SNAI1, along with subsequent discovery of USP27X as a TGF-β-induced SNAI1 DUB, established that signal-specific deubiquitinases dynamically oppose the constitutive ubiquitin-dependent degradation of SNAI1.","evidence":"In vitro deubiquitinase assays, Co-IP, shRNA with rescue, in vivo metastasis models for Dub3; siRNA screen, Co-IP, ubiquitination assays for USP27X","pmids":["28198361","30341066"],"confidence":"High","gaps":["Whether Dub3, USP27X, and other DUBs act on the same ubiquitin chains","Structural basis for DUB specificity toward SNAI1"]},{"year":2019,"claim":"Two discoveries defined opposing phosphorylation switches: aPKC phosphorylation at S249 under intact polarity promotes degradation, while p38 phosphorylation at S107 blocks the DYRK2/GSK3β/β-TrCP degradation cascade, revealing how polarity loss and stress cooperate to stabilize SNAI1.","evidence":"3D organoid and kinase assays (aPKC/S249); in vitro kinase assays and epistasis with DYRK2/GSK3β (p38/S107)","pmids":["30804505","31209060"],"confidence":"High","gaps":["Whether aPKC and p38 pathways converge on the same SNAI1 molecules","In vivo validation of S107 phosphorylation in human tumors"]},{"year":2019,"claim":"Demonstration that UDP-glucose inhibits HuR binding to SNAI1 mRNA, and EGFR-activated UGDH diverts UDP-glucose to relieve this inhibition, revealed a metabolite-mediated post-transcriptional control mechanism for SNAI1 expression.","evidence":"In vitro RNA-protein binding, UGDH Y473 mutagenesis, RNA stability assays, lung cancer metastasis models","pmids":["31243371"],"confidence":"High","gaps":["Whether other metabolites similarly regulate SNAI1 mRNA stability","Structural basis of UDP-glucose–HuR interaction"]},{"year":2023,"claim":"Two novel regulatory mechanisms emerged: CBP/p300-mediated lactylation of SNAI1 stabilizes the protein and promotes endothelial-to-mesenchymal transition, while JNK-USP36 signaling redirects SNAI1 to the nucleolus to facilitate ribosome biogenesis under ribotoxic stress—demonstrating that SNAI1 has functions beyond canonical transcriptional repression.","evidence":"Lactylation assay with MCT inhibition and in vivo MI model (lactylation); subcellular fractionation, nucleolar imaging, ribosome biogenesis assays, tumor models (USP36/nucleolus)","pmids":["36735787","37833415"],"confidence":"High","gaps":["Specific SNAI1 residues modified by lactylation","Molecular mechanism by which nucleolar SNAI1 promotes ribosome biogenesis","Whether lactylation and ubiquitination compete for the same lysines"]},{"year":null,"claim":"Outstanding questions include: the full structural basis of SNAI1 interactions with its E2-box targets and co-repressor complexes; how the many stabilizing and destabilizing modifications are integrated on single SNAI1 molecules in real time; and the extent and mechanism of SNAI1's non-EMT functions (ribosome biogenesis, telomere maintenance, metabolic regulation) across tissues.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of SNAI1 bound to DNA or co-repressor complex","No systems-level quantitative model integrating phosphorylation, ubiquitination, PARylation, and lactylation","Nucleolar and metabolic functions not yet validated across independent labs"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,4,24,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,4,6,12,25,32,34,35]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,5,10,16,31,42]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[30]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,12]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,4,6,12,17,18,25,34,35]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,5,7,14,16,19,31,41]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,12,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[8,9,10,14,26,27,28,29,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[39,43]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[5,32]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[25,40]}],"complexes":["G9a-DNMT epigenetic complex","LSD1-CoREST-HMG20A complex","UHRF1-DNMT1-G9a-SNAIL1 complex"],"partners":["G9A","LSD1","HMG20A","FBXL5","USP27X","USP3","LATS2","PARP1"],"other_free_text":[]},"mechanistic_narrative":"SNAI1 encodes a zinc-finger transcriptional repressor that serves as a master regulator of epithelial-mesenchymal transition (EMT) and also controls mesenchymal cell function, adipocyte lipolysis, and early embryonic lineage decisions. SNAI1 binds E2-box sequences through its ZF1 and ZF2 zinc fingers and represses epithelial target genes—most notably CDH1 (E-cadherin)—by recruiting co-repressor complexes including G9a/DNMT (mediating H3K9me2 and DNA methylation) and LSD1-CoREST (via HMG20A), while also controlling ZEB1 and tight-junction gene expression during EMT [PMID:22406531, PMID:25639869, PMID:21317430, PMID:24297167]. SNAI1 protein stability, nuclear retention, and transcriptional activity are governed by a phosphorylation code in which stabilizing kinases (Lats2 and STK39 at T203, ERK2, p38 at S107) oppose a degradation cascade (DYRK2-S104/GSK3β/CK2 phosphorylation leading to β-TrCP-, FBXL5-, and FBXO31-mediated ubiquitination), while multiple deubiquitinases (Dub3, USP27X, USP9X, USP18, USP36, USP37) counteract ubiquitin-dependent turnover to stabilize SNAI1 in response to cytokine, mechanical, and stress signals [PMID:21952048, PMID:34335956, PMID:31209060, PMID:28198361, PMID:30341066, PMID:24157836]. Beyond canonical EMT, SNAI1 functions as a metabolic regulator by directly repressing ATGL in adipocytes downstream of insulin signaling, represses its own promoter in a negative-feedback loop, and under ribotoxic stress is stabilized in the nucleolus by USP36 to facilitate ribosome biogenesis [PMID:27851965, PMID:16617148, PMID:37833415]."},"prefetch_data":{"uniprot":{"accession":"O95863","full_name":"Zinc finger protein SNAI1","aliases":["Protein snail homolog 1","Protein sna"],"length_aa":264,"mass_kda":29.1,"function":"Involved in induction of the epithelial to mesenchymal transition (EMT), formation and maintenance of embryonic mesoderm, growth arrest, survival and cell migration (PubMed:10655587, PubMed:15647282, PubMed:20389281, PubMed:20562920, PubMed:21952048, PubMed:25827072). Binds to 3 E-boxes of the E-cadherin/CDH1 gene promoter and to the promoters of CLDN7 and KRT8 and, in association with histone demethylase KDM1A which it recruits to the promoters, causes a decrease in dimethylated H3K4 levels and represses transcription (PubMed:10655587, PubMed:20389281, PubMed:20562920). The N-terminal SNAG domain competes with histone H3 for the same binding site on the histone demethylase complex formed by KDM1A and RCOR1, and thereby inhibits demethylation of histone H3 at 'Lys-4' (in vitro) (PubMed:20389281, PubMed:21300290, PubMed:23721412). During EMT, involved with LOXL2 in negatively regulating pericentromeric heterochromatin transcription (PubMed:16096638). SNAI1 recruits LOXL2 to pericentromeric regions to oxidize histone H3 and repress transcription which leads to release of heterochromatin component CBX5/HP1A, enabling chromatin reorganization and acquisition of mesenchymal traits (By similarity). Associates with EGR1 and SP1 to mediate tetradecanoyl phorbol acetate (TPA)-induced up-regulation of CDKN2B, possibly by binding to the CDKN2B promoter region 5'-TCACA-3 (PubMed:20121949). In addition, may also activate the CDKN2B promoter by itself (PubMed:20121949)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O95863/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SNAI1","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/SNAI1","total_profiled":1310},"omim":[{"mim_id":"621546","title":"TETRATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 22; TTC22","url":"https://www.omim.org/entry/621546"},{"mim_id":"618739","title":"CTD SMALL PHOSPHATASE-LIKE PROTEIN 2; CTDSPL2","url":"https://www.omim.org/entry/618739"},{"mim_id":"618703","title":"ZINC FINGER PROTEIN 281; ZNF281","url":"https://www.omim.org/entry/618703"},{"mim_id":"617438","title":"CHROMOBOX 6; CBX6","url":"https://www.omim.org/entry/617438"},{"mim_id":"614027","title":"INSULINOMA-ASSOCIATED 2; INSM2","url":"https://www.omim.org/entry/614027"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":28.6}],"url":"https://www.proteinatlas.org/search/SNAI1"},"hgnc":{"alias_symbol":["SNA","SLUGH2","SNAH","SNAIL1","SNAIL"],"prev_symbol":[]},"alphafold":{"accession":"O95863","domains":[{"cath_id":"3.30.160.60","chopping":"193-232","consensus_level":"medium","plddt":66.732,"start":193,"end":232},{"cath_id":"3.30.160","chopping":"153-182","consensus_level":"medium","plddt":70.633,"start":153,"end":182},{"cath_id":"3.30.160","chopping":"235-264","consensus_level":"medium","plddt":68.4277,"start":235,"end":264}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95863","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95863-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95863-F1-predicted_aligned_error_v6.png","plddt_mean":57.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SNAI1","jax_strain_url":"https://www.jax.org/strain/search?query=SNAI1"},"sequence":{"accession":"O95863","fasta_url":"https://rest.uniprot.org/uniprotkb/O95863.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95863/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95863"}},"corpus_meta":[{"pmid":"24168186","id":"PMC_24168186","title":"The 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Signaling.","date":"2023","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/37174625","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47384,"output_tokens":9823,"usd":0.144749},"stage2":{"model":"claude-opus-4-6","input_tokens":13888,"output_tokens":4246,"usd":0.263385},"total_usd":0.408134,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"SNAI1 interacts with G9a (a euchromatin H3K9 methyltransferase) and recruits G9a and DNA methyltransferases to the E-cadherin (CDH1) promoter, leading to H3K9me2 and subsequent DNA methylation to repress E-cadherin expression during EMT.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, G9a knockdown with rescue experiments, in vitro and in vivo breast cancer models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, functional KD with defined molecular phenotype, replicated across multiple cell lines\",\n      \"pmids\": [\"22406531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Collagen I receptor DDR2 stabilizes SNAIL1 by activating ERK2 (in a Src-dependent manner), which directly phosphorylates SNAIL1, leading to SNAIL1 nuclear accumulation, reduced ubiquitylation, and increased protein half-life.\",\n      \"method\": \"In vitro kinase assay, cycloheximide chase, co-immunoprecipitation, mutagenesis, xenograft metastasis models\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct phosphorylation demonstrated in vitro, protein stability and localization assays, in vivo validation\",\n      \"pmids\": [\"23644467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Lats2 kinase interacts with SNAIL1 and directly phosphorylates it at residue T203 in the nucleus, retaining SNAIL1 in the nucleus and enhancing its stability and EMT-inducing activity.\",\n      \"method\": \"Kinome RNAi screen, in vitro kinase assay, bioluminescence-based live-cell screen, mouse and zebrafish embryo models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro phosphorylation, site-specific mutagenesis, confirmed in vivo in two model organisms\",\n      \"pmids\": [\"21952048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SNAIL1 protein binds to an E-box in its own promoter (at -146 relative to transcription start) and represses its own transcription, establishing a negative feedback loop controlling SNAIL1 expression.\",\n      \"method\": \"ChIP, promoter-reporter assays, E-box mutagenesis, ectopic expression studies\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP of endogenous protein, mutagenesis, reporter assays with multiple controls\",\n      \"pmids\": [\"16617148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SNAIL1 zinc fingers ZF1 and ZF2 are specifically required for efficient binding to E-cadherin promoter E2-boxes and for EMT induction, whereas SNAIL2 requires ZF3 or ZF4 for these functions.\",\n      \"method\": \"Structural modeling, mutational analysis of individual zinc fingers, DNA binding assays, functional EMT assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with DNA binding and functional assays\",\n      \"pmids\": [\"24297167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"aPKC kinases (PAR complex) phosphorylate SNAIL1 at S249 under conditions of intact apical-basal polarity, promoting SNAIL1 protein degradation; loss of polarity prevents this phosphorylation and stabilizes SNAIL1 to promote EMT.\",\n      \"method\": \"3D organoid cultures, aPKC kinase assays, site-directed mutagenesis (S249), xenograft tumor models, human breast tissue correlation\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct phosphorylation site identified, mutagenesis, multiple cellular and in vivo models\",\n      \"pmids\": [\"30804505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SNAIL1 controls the expression of ZEB1 during TGF-β-induced EMT by multiple mechanisms: depletion of SNAIL1 prevents ZEB1 mRNA and protein upregulation, SNAIL1 is required for nuclear translocation of Ets1 (which binds the proximal ZEB1 promoter), and SNAIL1 cooperates with Twist for maximal ZEB1 transcription.\",\n      \"method\": \"siRNA knockdown, co-transfection assays, TGF-β treatment time-course, ChIP for Twist/Ets1 binding to ZEB1 promoter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, defined pathway epistasis with promoter binding validation\",\n      \"pmids\": [\"21317430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HMGA2 directly binds the SNAIL1 promoter and cooperates with TGF-β/Smad signaling to regulate SNAIL1 gene expression; physical interaction between HMGA2 and Smads increases Smad binding to the SNAIL1 promoter.\",\n      \"method\": \"ChIP, co-immunoprecipitation, promoter-reporter assays, SNAIL1 knockdown rescue experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct promoter binding, Co-IP for physical interaction, functional rescue\",\n      \"pmids\": [\"18832382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Dub3 is a deubiquitinase that interacts with and stabilizes SNAIL1 by removing ubiquitin modifications; IL-6 induces Dub3 expression, which prevents SNAIL1 degradation, and inhibitor WP1130 binds Dub3 to block this stabilization.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, in vitro deubiquitinase assay, shRNA knockdown, ectopic rescue, in vivo metastasis models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct enzymatic activity demonstrated, Co-IP, multiple in vitro/in vivo models with rescue\",\n      \"pmids\": [\"28198361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP27X is a deubiquitinase that stabilizes SNAIL1 protein; USP27X is upregulated by TGF-β during EMT and is required for TGF-β-induced SNAIL1 expression and EMT in epithelial cells and cancer-associated fibroblasts.\",\n      \"method\": \"siRNA screen, Co-immunoprecipitation, ubiquitination assays, cell migration/invasion assays, in vivo metastasis models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — screen-identified, confirmed by Co-IP, enzymatic assay, multiple functional readouts\",\n      \"pmids\": [\"30341066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FBXL5 is a nuclear ubiquitin ligase that interacts with SNAIL1, promoting its polyubiquitination; this impairs SNAIL1 DNA binding and leads to cytosolic proteasomal degradation. Lats2 phosphorylation of SNAIL1 prevents nuclear export but not polyubiquitination by FBXL5.\",\n      \"method\": \"shRNA screening, Co-immunoprecipitation, ubiquitination assay, DNA binding assay, iron depletion and γ-irradiation stress experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mechanistic dissection with Co-IP, ubiquitination assay, DNA binding, and kinase crosstalk\",\n      \"pmids\": [\"24157836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PARP-1 poly(ADP-ribosyl)ates SNAIL1 both in vitro and in vivo, and this modification (along with PARP-1 interaction) controls SNAIL1 protein stability; PARP inhibition reduces SNAIL1 protein levels and impairs EMT.\",\n      \"method\": \"In vitro and in vivo PAR assay, Co-immunoprecipitation, PARP-1 knockdown and inhibitor studies, EMT phenotype assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro and in vivo modification assay with defined enzyme (PARP-1 not PARP-2), functional consequences shown\",\n      \"pmids\": [\"21577210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SNAIL1 interacts with the LSD1-CoREST histone demethylase complex (via HMG20A), and HMG20A is required for SNAIL1-dependent repression of epithelial genes; HMG20A-depleted cells show reduced LSD1 binding to epithelial gene promoters and increased H3K4 methylation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, transcriptomics, knockdown studies, TGF-β-induced EMT assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ChIP, transcriptomic validation, functional rescue in multiple models\",\n      \"pmids\": [\"25639869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"UDP-glucose directly inhibits the association of HuR with SNAI1 mRNA, leading to SNAI1 mRNA degradation; EGFR-activated UGDH phosphorylation at Y473 converts UDP-glucose to UDP-glucuronic acid, attenuating UDP-glucose-mediated inhibition and thereby stabilizing SNAI1 mRNA to promote EMT.\",\n      \"method\": \"In vitro RNA-protein binding assays, UGDH phosphorylation mutagenesis, RNA stability assays, lung cancer cell and in vivo metastasis models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical reconstitution of UDP-glucose/HuR/SNAI1 mRNA interaction, mutagenesis, in vivo validation\",\n      \"pmids\": [\"31243371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"p38 MAPK directly phosphorylates SNAIL1 at Ser107, and this suppresses DYRK2-mediated Ser104 phosphorylation that is required for GSK3β-dependent SNAIL1 phosphorylation and βTrCP-mediated ubiquitination and degradation, thereby stabilizing SNAIL1.\",\n      \"method\": \"In vitro kinase assays, site-directed mutagenesis, ubiquitination assays, ovarian cancer functional studies\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro phosphorylation at defined site, mechanistic epistasis with DYRK2/GSK3β/βTrCP degradation pathway\",\n      \"pmids\": [\"31209060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SNAIL1 is required for normal mesenchymal cell function: Snail1-deficient fibroblasts show defects in MT1-MMP-dependent 3D invasive activity and fail to induce angiogenesis on chick chorioallantoic membrane.\",\n      \"method\": \"Conditional knockout mouse model (Snai1 flox), 3D extracellular matrix invasion assay, gene expression profiling, chorioallantoic membrane assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with specific molecular and cellular phenotypes, in vitro and in vivo readouts\",\n      \"pmids\": [\"19188491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ECM stiffness activates ROCK, which indirectly increases ERK2 activity via integrin signaling, leading to SNAIL1 nuclear accumulation (avoidance of cytosolic proteasome degradation); nuclear SNAIL1 then drives a fibrogenic response in cancer-associated fibroblasts and influences YAP1 activity.\",\n      \"method\": \"Stiff matrix culture, ROCK inhibition, ERK2 knockdown, subcellular fractionation, in vivo CAF studies\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined signaling pathway from mechanical stimulus to SNAIL1 localization with multiple inhibitor and genetic controls\",\n      \"pmids\": [\"27076520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HIF-1α and HIF-2α directly bind a hypoxia-response element (HRE) in the SNAI1 promoter and activate SNAI1 gene transcription in response to hypoxia, thereby stimulating EMT and cell migration.\",\n      \"method\": \"Gel shift assay (EMSA), ChIP, reporter gene analysis with HRE mutation, HIF siRNA knockdown, HIF-ΔODD overexpression\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — EMSA and ChIP demonstrate direct HIF binding to SNAI1 promoter HRE, functional mutagenesis, gain/loss of function\",\n      \"pmids\": [\"21257819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SETDB1/ESET, recruited by Smad3, represses SNAIL1 (SNAI1) gene transcription by imposing H3K9 methylation at the SNAI1 gene locus, counteracting H3K9 acetylation promoted by activated Smad3/4 complexes; TGF-β attenuates SETDB1 expression to relieve this repression during EMT.\",\n      \"method\": \"ChIP, histone modification analysis, siRNA knockdown of SETDB1, TGF-β stimulation, reporter assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP for histone modifications at SNAI1 locus, Smad3 recruitment shown, mechanistic epistasis with TGF-β pathway\",\n      \"pmids\": [\"29233829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Lactate induces CBP/p300-mediated lactylation of SNAIL1, stabilizing it and promoting endothelial-to-mesenchymal transition; this is dependent on MCT (monocarboxylate transporter) signaling.\",\n      \"method\": \"Co-immunoprecipitation, lactylation assay, MCT inhibitor (CHC), MCT1 silencing, in vivo myocardial infarction model\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct lactylation modification shown with writer (CBP/p300), pharmacological and genetic inhibition, in vivo validation\",\n      \"pmids\": [\"36735787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tyrosine-phosphorylated p68 RNA helicase activates SNAIL1 transcription by promoting dissociation of HDAC1 from the SNAIL1 promoter; p68 interacts with the NuRD/MBD3:Mi-2 chromatin remodeling complex.\",\n      \"method\": \"Chromatin immunoprecipitation, co-immunoprecipitation, p68 phosphorylation mutant (Y593), SNAIL1 promoter-reporter assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and Co-IP, single lab with orthogonal methods but mechanistic model partially inferred\",\n      \"pmids\": [\"20676135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DACH1 specifically interacts with SNAIL1 (not SNAIL2) to form a complex that can bind the E-box on the E-cadherin promoter in a SNAIL1-dependent manner; DACH1 inhibits SNAIL1 transcriptional activity leading to E-cadherin activation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, luciferase reporter assays, gain/loss of function, mouse xenograft model\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ChIP, reporter assays, in vivo model; single lab\",\n      \"pmids\": [\"25775416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CK2 holoenzyme (dependent on the CK2β regulatory subunit) synergistically with GSK3β hierarchically phosphorylates SNAIL1 to negatively regulate its stability; loss of CK2β promotes SNAIL1 induction and EMT.\",\n      \"method\": \"CK2β depletion in epithelial cells, protein stability assays, kinase inhibition, in vitro phosphorylation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro kinase evidence, functional EMT phenotypes, clinical correlation; single lab\",\n      \"pmids\": [\"22562247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Notch1 intracellular domain (NICD) binds SNAIL1 and induces its ubiquitination and MDM2-dependent degradation, thereby inhibiting SNAIL1-dependent cancer cell invasion.\",\n      \"method\": \"Tandem affinity purification/mass spectrometry, Co-immunoprecipitation, subcellular colocalization, invasion assays in HCC cells and mouse embryonic fibroblasts\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS interactome confirmed by Co-IP, functional invasion assay; single lab\",\n      \"pmids\": [\"22128911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SNAIL1 and SNAIL2 proteins bind to E2-box sequences in both their own and each other's promoters during chondrogenesis, providing a cross-regulatory mechanism explaining the genetic redundancy between these two genes.\",\n      \"method\": \"ChIP on endogenous proteins in differentiating ATDC5 chondrogenic cells, mouse Snai1/Snai2 double conditional knockout genetic analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous ChIP, genetic epistasis confirmation; single lab\",\n      \"pmids\": [\"23665016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Adipocyte SNAIL1 binds the ATGL (adipose triacylglycerol lipase) promoter to repress its expression; adipocyte-specific Snail1 deletion increases ATGL expression and lipolysis, decreasing fat mass and increasing liver fat content.\",\n      \"method\": \"Adipocyte-specific conditional knockout mouse, ChIP for SNAIL1 at ATGL promoter, lipolysis assays, metabolic phenotyping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with clear metabolic phenotype, ChIP demonstrating direct promoter binding, in vivo metabolic validation\",\n      \"pmids\": [\"27851965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FBXO31 (SCF E3 ligase component) interacts with SNAIL1 and mediates its ubiquitin- and proteasome-dependent degradation; SNAIL1 phosphorylation (by GSK-3β) and the FBXO31 F-box domain are necessary for this interaction.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination/proteasome assay, site-specific phosphorylation mutants, in vivo xenograft models\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, phosphorylation dependence; single lab\",\n      \"pmids\": [\"29117943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PLAGL2 activates transcription of deubiquitinase USP37, which then directly interacts with and deubiquitinates SNAIL1 protein; GSK-3β-dependent phosphorylation of SNAIL1 is essential for USP37-mediated deubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, luciferase reporter for USP37 promoter, in vitro and in vivo gastric cancer models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, phosphorylation dependence; single lab\",\n      \"pmids\": [\"33391500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP9X deubiquitinates and stabilizes SNAIL1, promoting EMT, metastasis, and chemoresistance in triple-negative breast cancer; pharmacological inhibition of USP9X with WP1130 destabilizes SNAIL1.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, USP9X knockdown/inhibitor, rescue by ectopic SNAIL1, in vivo metastasis models\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — deubiquitinase activity shown, rescue experiments, in vivo validation; single lab\",\n      \"pmids\": [\"35506169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP18 deubiquitinates and stabilizes SNAIL1 protein in colorectal cancer cells, promoting their proliferation, migration, invasion, and EMT.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, USP18 overexpression/knockdown, rescue by SNAIL1, functional assays\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and deubiquitination assay; single lab, no in vivo component\",\n      \"pmids\": [\"32742193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ribotoxic stress activates the JNK-USP36 signaling axis, which stabilizes SNAIL1 in the nucleolus; nucleolar SNAIL1 facilitates ribosome biogenesis and promotes solid tumor cell survival during ribotoxic stress.\",\n      \"method\": \"JNK/USP36 signaling inhibition, subcellular fractionation, SNAIL1 nucleolar localization imaging, ribosome biogenesis assays, in vivo tumor models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — novel nucleolar function with mechanistic epistasis and in vivo confirmation; single lab\",\n      \"pmids\": [\"37833415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STK39 kinase interacts with and phosphorylates SNAIL1 at T203, which is critical for SNAIL1 nuclear retention and stability, thereby promoting EMT, invasion, and metastasis in breast cancer.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis (T203), Co-immunoprecipitation, subcellular fractionation, in vivo breast cancer metastasis model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct phosphorylation at defined site in vitro, mutagenesis, nuclear retention mechanism, in vivo validation\",\n      \"pmids\": [\"34335956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Bacterial infection induces SNAIL1 expression via the ERK1/2/MAPK signaling cascade and bacterial cell wall components; induced SNAIL1 represses tight junction genes (ZO-1, claudin 5, occludin) at the transcript and protein levels to disrupt the blood-brain barrier.\",\n      \"method\": \"SNAIL1 siRNA/dominant-negative overexpression, ERK1/2 inhibition, zebrafish infection model, permeability assays, qPCR/Western blot of tight junction components\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific molecular targets, in vitro and in vivo (zebrafish) validation\",\n      \"pmids\": [\"25461453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LASP-1 directly binds SNAIL1 (possibly stabilizing it) and serves as a nuclear hub assembling the UHRF1-DNMT1-G9a-Snail1 epigenetic complex in a CXCL12-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry of LASP-1 immunoprecipitates, proximity ligation assays, nuclear fractionation, CXCL12 stimulation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP confirmed by proximity ligation; mechanistic consequence of complex partially inferred\",\n      \"pmids\": [\"25982273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Snail1 represses expression of telomerase gene (TERT) and telomeric repeat-containing RNA (TERRA), and this repression is required for telomere maintenance; Snail1-deficient mouse mesenchymal stem cells show increased TERRA/TERT levels and telomere alterations.\",\n      \"method\": \"FISH (telomere alterations), TERRA/TERT expression analysis, conditional Snail1 knockout in MSCs, TGFβ-induced EMT correlation, transcriptome analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with specific molecular phenotype (telomere integrity), functional link to TERRA and TERT; single lab\",\n      \"pmids\": [\"29059385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In colorectal cancer cells, SNAIL1 upregulates LEF1 and employs β-Catenin-LEF1 complexes to redirect Wnt/β-Catenin target gene activity toward pro-invasive and anti-proliferative gene expression; LEF1 accounts for ~35% of SNAIL1-induced transcriptional changes.\",\n      \"method\": \"Conditional SNAIL1 expression, CRISPR/Cas9 LEF1 knockout and β-Catenin interaction mutant, transcriptome analysis, invasion assays, xenotransplantation\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO and transcriptomics, functional invasion assays; single lab\",\n      \"pmids\": [\"31463973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, Snail can positively potentiate Twist-mediated enhancer activation; differentially enriched cis-regulatory motifs predict whether Snail represses or activates target genes, with almost 50% of direct targets showing activation.\",\n      \"method\": \"ChIP-seq for in vivo Snail occupancy, expression profiling of staged snail mutant embryos, enhancer reporter assays, machine learning motif analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq, mutant embryo expression profiling, in vitro and in vivo enhancer assays; Drosophila ortholog\",\n      \"pmids\": [\"24402316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FTO (m6A demethylase) decreases m6A modification and stability of SNAI1 mRNA; IGF2BP2 acts as an m6A reader binding to the 3' UTR of SNAI1 mRNA to promote its stability, and FTO-mediated downregulation of SNAI1 depends on IGF2BP2.\",\n      \"method\": \"m6A RNA immunoprecipitation (MeRIP), RIP assay, actinomycin D mRNA stability assay, FTO overexpression/knockdown, in vivo ovarian cancer models\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MeRIP and RIP demonstrate m6A modification and reader binding; IGF2BP2 dependence shown; single lab\",\n      \"pmids\": [\"36358640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In NMuMG cells, transient SNAIL1 expression is uniquely required for EMT initiation (E-cadherin downregulation), and SNAIL1 transiently represses Twist1 transcription directly; as SNAIL1 levels decrease, Twist1 is upregulated to sustain late EMT.\",\n      \"method\": \"RNAi knockdown, transient TGF-β treatment, quantitative gene expression analysis, epistasis experiments in nontumorigenic and cancer cell lines\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNAi epistasis with temporal resolution; direct repression of Twist1 by SNAIL1 shown by reporter; single lab\",\n      \"pmids\": [\"22006115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Conditional null Snai1 mouse allele created using Cre-loxP system (flanking promoter and first two exons); deletion recapitulates Snai1-null gastrulation defects, establishing the allele for tissue-specific loss-of-function studies.\",\n      \"method\": \"Conditional knockout generation, Cre-mediated deletion, genetic complementation with null allele\",\n      \"journal\": \"Genesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic tool paper with allele validation; foundational for subsequent mechanistic studies\",\n      \"pmids\": [\"16397867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Snail1 suppresses adipose ATGL expression by binding the ATGL promoter; insulin increases Snail1 levels in adipocytes, linking nutritional state to Snail1-mediated lipolysis regulation.\",\n      \"method\": \"ChIP for SNAIL1 at ATGL promoter, conditional adipocyte-specific KO, insulin treatment in murine and human adipocytes, lipolysis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP, adipocyte-specific conditional KO with direct metabolic phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"27851965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Lyn kinase modulates SNAI1 protein localization and stability through the Vav-Rac1-PAK1 pathway; targeting Lyn reduces EMT and metastasis in vitro and in vivo.\",\n      \"method\": \"Lyn knockdown/inhibition, subcellular fractionation, Vav-Rac1-PAK1 pathway inhibitors, in vivo primary tumor metastasis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined pathway epistasis with localization and stability readouts; single lab\",\n      \"pmids\": [\"28288135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RHOF promotes c-Myc expression, which drives PKM2 transcription, increasing glycolysis and lactate production; lactate causes lactylation of SNAIL1 and its nuclear translocation, promoting EMT in pancreatic cancer cells.\",\n      \"method\": \"Western blotting, co-immunoprecipitation, lactylation assay, SNAIL1 nuclear translocation imaging, Snail1 silencing rescue, xenograft mouse model\",\n      \"journal\": \"Cancer & metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — SNAIL1 lactylation demonstrated, nuclear translocation and functional rescue shown; single lab\",\n      \"pmids\": [\"39462429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In mouse embryonic stem cells, an endogenous Wnt-mediated burst of SNAIL1 expression during differentiation regulates neuroectodermal fate and is required for epiblast stem cell exit and mesoderm commitment, independent of EMT.\",\n      \"method\": \"Isogenic conditional knockout ESCs, Wnt stimulation, lineage fate analysis, transcriptome profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific lineage phenotypes; novel non-EMT role established; single lab\",\n      \"pmids\": [\"24401905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NOTCH1 intracellular domain upregulates SNAIL1 expression to increase tumor-propagating cell number in embryonal rhabdomyosarcoma; SNAIL1 blocks muscle differentiation through suppression of the myogenic transcription factor MEF2C.\",\n      \"method\": \"Zebrafish ERMS transgenic model, SNAIL1 and MEF2C knockdown, tumor transplantation assay, human ERMS cell functional studies\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined NOTCH1/SNAI1/MEF2C axis with genetic evidence in zebrafish and human cells; single lab\",\n      \"pmids\": [\"28614716\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SNAIL1 is a zinc-finger transcriptional repressor (acting through its SNAG domain and C2H2 zinc fingers binding E2-box sequences) that drives EMT by recruiting co-repressor/epigenetic complexes (LSD1-CoREST, G9a/DNMTs, PRC2) to target promoters such as CDH1 (E-cadherin); its activity, subcellular localization, and stability are tightly regulated by a network of phosphorylation events (by GSK3β, ERK2, Lats2, aPKC, p38, STK39, DYRK2), ubiquitination by E3 ligases (β-TrCP, FBXL5, FBXO31), deubiquitination by multiple DUBs (Dub3, USP27X, USP9X, USP18, USP36, USP37), and non-canonical modifications including poly(ADP-ribosyl)ation (by PARP-1) and lactylation (by CBP/p300), collectively determining whether SNAIL1 is retained in the nucleus to repress epithelial genes or exported for proteasomal degradation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SNAI1 encodes a zinc-finger transcriptional repressor that serves as a master regulator of epithelial-mesenchymal transition (EMT) and also controls mesenchymal cell function, adipocyte lipolysis, and early embryonic lineage decisions. SNAI1 binds E2-box sequences through its ZF1 and ZF2 zinc fingers and represses epithelial target genes—most notably CDH1 (E-cadherin)—by recruiting co-repressor complexes including G9a/DNMT (mediating H3K9me2 and DNA methylation) and LSD1-CoREST (via HMG20A), while also controlling ZEB1 and tight-junction gene expression during EMT [PMID:22406531, PMID:25639869, PMID:21317430, PMID:24297167]. SNAI1 protein stability, nuclear retention, and transcriptional activity are governed by a phosphorylation code in which stabilizing kinases (Lats2 and STK39 at T203, ERK2, p38 at S107) oppose a degradation cascade (DYRK2-S104/GSK3β/CK2 phosphorylation leading to β-TrCP-, FBXL5-, and FBXO31-mediated ubiquitination), while multiple deubiquitinases (Dub3, USP27X, USP9X, USP18, USP36, USP37) counteract ubiquitin-dependent turnover to stabilize SNAI1 in response to cytokine, mechanical, and stress signals [PMID:21952048, PMID:34335956, PMID:31209060, PMID:28198361, PMID:30341066, PMID:24157836]. Beyond canonical EMT, SNAI1 functions as a metabolic regulator by directly repressing ATGL in adipocytes downstream of insulin signaling, represses its own promoter in a negative-feedback loop, and under ribotoxic stress is stabilized in the nucleolus by USP36 to facilitate ribosome biogenesis [PMID:27851965, PMID:16617148, PMID:37833415].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing that SNAI1 auto-represses its own promoter via an E-box revealed a built-in negative feedback loop, raising the question of how SNAI1 expression is dynamically tuned during EMT.\",\n      \"evidence\": \"ChIP of endogenous SNAI1 at its own promoter E-box, reporter mutagenesis, and ectopic expression in epithelial cells\",\n      \"pmids\": [\"16617148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the auto-repressive loop operates in all tissue contexts\", \"Quantitative contribution of auto-repression versus upstream signals to SNAI1 dynamics\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of HMGA2 and Smad-dependent transcriptional activation of the SNAI1 promoter connected TGF-β signaling directly to SNAI1 gene induction, establishing the upstream pathway for EMT initiation.\",\n      \"evidence\": \"ChIP and Co-IP showing HMGA2-Smad binding at the SNAI1 promoter, reporter assays, functional rescue\",\n      \"pmids\": [\"18832382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HMGA2-Smad cooperativity is tissue-restricted\", \"Relative contribution versus other SNAI1 promoter activators such as HIF\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Conditional Snail1 knockout in fibroblasts demonstrated that SNAI1 is required for normal mesenchymal cell functions—3D invasion and angiogenesis—extending its role beyond epithelial-to-mesenchymal conversion.\",\n      \"evidence\": \"Conditional knockout mouse fibroblasts, 3D collagen invasion assay, chorioallantoic membrane angiogenesis assay\",\n      \"pmids\": [\"19188491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether invasion defects are solely via MT1-MMP or involve additional targets\", \"Mesenchymal transcriptional program governed by SNAI1 beyond identified targets\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Multiple studies converged to define how SNAI1 protein stability is regulated: Lats2 phosphorylation at T203 retains SNAI1 in the nucleus to enhance EMT, while PARP-1-mediated poly(ADP-ribosyl)ation independently stabilizes SNAI1—establishing that post-translational modifications constitute a critical regulatory layer beyond transcriptional control.\",\n      \"evidence\": \"In vitro kinase assay (Lats2/T203), in vitro and in vivo PARylation assay (PARP-1), mutagenesis, zebrafish/mouse embryo and EMT cell models\",\n      \"pmids\": [\"21952048\", \"21577210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PARylation and T203 phosphorylation act on the same or distinct SNAI1 pools\", \"Structural basis for how T203 phosphorylation blocks nuclear export\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstration that SNAI1 is required upstream of ZEB1 induction during TGF-β-driven EMT, and transiently represses Twist1, established the temporal hierarchy of EMT transcription factors with SNAI1 acting as the initiator.\",\n      \"evidence\": \"siRNA epistasis, TGF-β time-course, ChIP for Ets1/Twist at ZEB1 promoter, quantitative expression analysis\",\n      \"pmids\": [\"21317430\", \"22006115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the SNAI1→ZEB1 hierarchy is universal across cancer types\", \"Direct versus indirect mechanisms for Ets1 nuclear translocation by SNAI1\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The discovery that SNAI1 recruits the G9a H3K9 methyltransferase and DNMTs to the CDH1 promoter revealed a dual epigenetic silencing mechanism (histone methylation followed by DNA methylation) explaining stable E-cadherin repression during EMT.\",\n      \"evidence\": \"Reciprocal Co-IP, ChIP at CDH1 promoter, G9a knockdown with rescue, breast cancer cell lines and xenografts\",\n      \"pmids\": [\"22406531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether G9a and DNMT recruitment is simultaneous or sequential\", \"Genome-wide extent of SNAI1-G9a co-occupancy beyond CDH1\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Structural dissection showed ZF1 and ZF2 are specifically required for E2-box binding, and identification of FBXL5 as a nuclear E3 ligase that ubiquitinates SNAI1 to impair DNA binding revealed that SNAI1 can be inactivated in the nucleus before export.\",\n      \"evidence\": \"Zinc-finger mutagenesis with DNA-binding assays, Co-IP and ubiquitination assays for FBXL5, functional EMT readouts\",\n      \"pmids\": [\"24297167\", \"24157836\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FBXL5-mediated ubiquitination targets specific SNAI1 lysines\", \"Crystal structure of SNAI1 zinc fingers bound to E2-box DNA\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"ERK2-mediated phosphorylation downstream of collagen receptor DDR2 was shown to stabilize SNAI1 and promote its nuclear accumulation, connecting extracellular matrix signaling to SNAI1 protein fate.\",\n      \"evidence\": \"In vitro kinase assay, cycloheximide chase, Src-dependence, xenograft metastasis models\",\n      \"pmids\": [\"23665016\", \"23644467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact ERK2 phosphorylation site(s) on SNAI1\", \"How ERK2 phosphorylation intersects mechanistically with Lats2/T203 and GSK3β pathways\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"HMG20A was identified as a bridging factor connecting SNAI1 to the LSD1-CoREST complex, explaining how SNAI1 recruits histone demethylase activity to maintain H3K4 demethylation at epithelial gene promoters.\",\n      \"evidence\": \"Co-IP, ChIP showing LSD1 occupancy dependent on HMG20A, H3K4me analysis, TGF-β EMT assays\",\n      \"pmids\": [\"25639869\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HMG20A is required at all SNAI1 target loci or only a subset\", \"Direct versus indirect interaction between SNAI1 and LSD1\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that SNAI1 directly represses ATGL in adipocytes, regulated by insulin, expanded SNAI1 function beyond EMT into metabolic regulation of lipolysis.\",\n      \"evidence\": \"Adipocyte-specific conditional knockout, ChIP at ATGL promoter, lipolysis and metabolic phenotyping\",\n      \"pmids\": [\"27851965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of metabolic gene targets of SNAI1 in adipocytes\", \"Whether the SNAG-domain co-repressor complexes used in EMT are the same ones used at ATGL\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of Dub3 as an IL-6-induced deubiquitinase that stabilizes SNAI1, along with subsequent discovery of USP27X as a TGF-β-induced SNAI1 DUB, established that signal-specific deubiquitinases dynamically oppose the constitutive ubiquitin-dependent degradation of SNAI1.\",\n      \"evidence\": \"In vitro deubiquitinase assays, Co-IP, shRNA with rescue, in vivo metastasis models for Dub3; siRNA screen, Co-IP, ubiquitination assays for USP27X\",\n      \"pmids\": [\"28198361\", \"30341066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Dub3, USP27X, and other DUBs act on the same ubiquitin chains\", \"Structural basis for DUB specificity toward SNAI1\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Two discoveries defined opposing phosphorylation switches: aPKC phosphorylation at S249 under intact polarity promotes degradation, while p38 phosphorylation at S107 blocks the DYRK2/GSK3β/β-TrCP degradation cascade, revealing how polarity loss and stress cooperate to stabilize SNAI1.\",\n      \"evidence\": \"3D organoid and kinase assays (aPKC/S249); in vitro kinase assays and epistasis with DYRK2/GSK3β (p38/S107)\",\n      \"pmids\": [\"30804505\", \"31209060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether aPKC and p38 pathways converge on the same SNAI1 molecules\", \"In vivo validation of S107 phosphorylation in human tumors\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstration that UDP-glucose inhibits HuR binding to SNAI1 mRNA, and EGFR-activated UGDH diverts UDP-glucose to relieve this inhibition, revealed a metabolite-mediated post-transcriptional control mechanism for SNAI1 expression.\",\n      \"evidence\": \"In vitro RNA-protein binding, UGDH Y473 mutagenesis, RNA stability assays, lung cancer metastasis models\",\n      \"pmids\": [\"31243371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other metabolites similarly regulate SNAI1 mRNA stability\", \"Structural basis of UDP-glucose–HuR interaction\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Two novel regulatory mechanisms emerged: CBP/p300-mediated lactylation of SNAI1 stabilizes the protein and promotes endothelial-to-mesenchymal transition, while JNK-USP36 signaling redirects SNAI1 to the nucleolus to facilitate ribosome biogenesis under ribotoxic stress—demonstrating that SNAI1 has functions beyond canonical transcriptional repression.\",\n      \"evidence\": \"Lactylation assay with MCT inhibition and in vivo MI model (lactylation); subcellular fractionation, nucleolar imaging, ribosome biogenesis assays, tumor models (USP36/nucleolus)\",\n      \"pmids\": [\"36735787\", \"37833415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific SNAI1 residues modified by lactylation\", \"Molecular mechanism by which nucleolar SNAI1 promotes ribosome biogenesis\", \"Whether lactylation and ubiquitination compete for the same lysines\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Outstanding questions include: the full structural basis of SNAI1 interactions with its E2-box targets and co-repressor complexes; how the many stabilizing and destabilizing modifications are integrated on single SNAI1 molecules in real time; and the extent and mechanism of SNAI1's non-EMT functions (ribosome biogenesis, telomere maintenance, metabolic regulation) across tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of SNAI1 bound to DNA or co-repressor complex\", \"No systems-level quantitative model integrating phosphorylation, ubiquitination, PARylation, and lactylation\", \"Nucleolar and metabolic functions not yet validated across independent labs\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 4, 24, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 4, 6, 12, 25, 32, 34, 35]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 5, 10, 16, 31, 42]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [30]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 4, 6, 12, 17, 18, 25, 34, 35]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 5, 7, 14, 16, 19, 31, 41]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 12, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [8, 9, 10, 14, 26, 27, 28, 29, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [39, 43]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [5, 32]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [25, 40]}\n    ],\n    \"complexes\": [\n      \"G9a-DNMT epigenetic complex\",\n      \"LSD1-CoREST-HMG20A complex\",\n      \"UHRF1-DNMT1-G9a-SNAIL1 complex\"\n    ],\n    \"partners\": [\n      \"G9a\",\n      \"LSD1\",\n      \"HMG20A\",\n      \"FBXL5\",\n      \"USP27X\",\n      \"USP3\",\n      \"LATS2\",\n      \"PARP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}