{"gene":"SOX1","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":1996,"finding":"SOX1 protein binds the same DNA sequence motif as SRY via its HMG box domain, but with different affinity compared to SOX2 and SOX3, as demonstrated by in vitro DNA-binding assays.","method":"In vitro DNA-binding assay (HMG box binding to DNA motif)","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro binding assay, single lab, single method","pmids":["8625802"],"is_preprint":false},{"year":1998,"finding":"SOX1 misexpression in P19 cells substitutes for retinoic acid in imparting neural fate to competent ectodermal cells, establishing SOX1 as sufficient for neural determination in this in vitro neurogenesis model.","method":"Inducible expression system in P19 cells; neural marker immunostaining and BrdU labeling","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in cell culture with multiple orthogonal markers, single lab","pmids":["9550729"],"is_preprint":false},{"year":1998,"finding":"SOX1, SOX2, and SOX3 together account for the deltaEF2 factors that activate the delta1-crystallin minimal enhancer DC5 in lens cells, and this activation depends on their C-terminal domains.","method":"Enhancer reporter assay; domain deletion analysis","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — reporter assay with domain mapping, replicated across SOX1/2/3, single lab","pmids":["9609835"],"is_preprint":false},{"year":1998,"finding":"Targeted deletion of Sox1 in mice causes microphthalmia and cataract with failure of lens fiber cell elongation; SOX1 directly interacts with a promoter element conserved in all gamma-crystallin genes to drive their expression.","method":"Gene targeting (knockout mice); promoter binding/interaction assay","journal":"Genes & Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo loss-of-function with defined phenotype plus direct promoter interaction, replicated across multiple gamma-crystallin genes","pmids":["9512512"],"is_preprint":false},{"year":1999,"finding":"The proximal portion of the SOX1 C-terminal domain specifically interacts with a partner factor to confer target-gene selectivity; the HMG domain alone is insufficient for specificity. Chimeric SOX1/SOX9 proteins showed that DC5 enhancer activation requires the SOX1 C-terminal domain regardless of HMG domain origin.","method":"Chimeric protein analysis; enhancer reporter assay; SOX2-VP16 fusion experiments","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with chimeric proteins and multiple mutagenesis/reporter approaches, mechanistic detail on partner-factor interaction","pmids":["9858536"],"is_preprint":false},{"year":2003,"finding":"SOX1-3 transcription factors keep neural cells undifferentiated by counteracting the activity of proneural bHLH proteins; conversely, proneural proteins direct neuronal differentiation by suppressing Sox1-3 expression in CNS progenitors.","method":"Chick in ovo electroporation (gain- and loss-of-function); neural marker analysis","journal":"Nature Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo epistasis by electroporation, bidirectional suppression demonstrated, widely replicated","pmids":["14517545"],"is_preprint":false},{"year":2004,"finding":"SOX1 (but not SOX2 or SOX3) directly binds the Hes1 promoter and suppresses Hes1 transcription, thereby attenuating Notch signaling; SOX1 also physically binds beta-catenin and suppresses TCF/LEF signaling. Both interactions require the C-terminus of SOX1. Additionally, SOX1 promotes cell cycle exit and upregulates neurogenin 1 transcription.","method":"Promoter-binding assay; overexpression in cultured neural progenitor cells; reporter assay; co-immunoprecipitation","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP-like binding, Co-IP, reporter assay) in single lab","pmids":["15110721"],"is_preprint":false},{"year":2005,"finding":"SOX1 is required in postmitotic ventral striatum neurons (not only progenitors) for their migration to correct position and acquisition of subtype identity; Sox1-null mice lack ventral striatum neurons due to a migration failure rather than a differentiation defect in precursors.","method":"Sox1-null allele expressing beta-galactosidase; conditional Sox1 expression directed to precursors; cell fate and migration analysis in vivo","journal":"PLoS Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic rescue experiments, lineage tracing, clear postmitotic requirement established","pmids":["15882093"],"is_preprint":false},{"year":2007,"finding":"SOX1 is identified as the antigen recognized by anti-glial nuclear antibody (AGNA)-positive sera; IgG eluted from SOX1 clones reproduced the characteristic cerebellar Bergmann glia nuclear immunoreactivity.","method":"Fetal brain cDNA library probing; immunoblot of phage plaques; IgG elution and tissue immunostaining","journal":"Neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — antigen identification by cDNA library screening plus functional validation by IgG elution and tissue staining, replicated in large patient cohort","pmids":["18032743"],"is_preprint":false},{"year":2007,"finding":"In Sox1-null lens fiber cells, Pax6 is inappropriately maintained and its target alpha5 integrin is misexpressed; Sox1 heterozygosity partially rescues Pax6(Sey) lens diameter, demonstrating a genetic interaction between Sox1 and Pax6 in which Sox1 normally represses Pax6 during fiber cell differentiation.","method":"Immunostaining of Sox1-null mouse lenses; genetic rescue (double mutant analysis)","journal":"Gene Expression Patterns","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic epistasis with double mutant, single lab","pmids":["17306631"],"is_preprint":false},{"year":2009,"finding":"During the neuron-to-glial fate switch in ventral spinal cord, SOX1 expression is regulated downstream of PAX6, NKX2.2, and Notch signaling in a domain-specific manner; SOX1 in turn regulates Hes1 expression, and loss of Sox1 leads to enhanced oligodendrocyte precursor production from pMN domain.","method":"In vivo loss-of-function (Sox1 null mice); in vitro gain-of-function; cell-fate marker analysis","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic loss-of-function with pathway placement, single lab","pmids":["19723505"],"is_preprint":false},{"year":2009,"finding":"In mouse embryonic stem cell differentiation, Sox1 maintains cells at the neuroepithelial stage and prevents expression of Pax6 and radial glial markers; continuous Sox1 expression blocks the Sox1→Pax6 transition, while Pax6 expression in neuroepithelial cells triggers their differentiation into radial glia and promotes cell migration.","method":"Overexpression and knockdown (shRNA) in ES cell neural differentiation assays; marker immunostaining","journal":"Stem Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional (OE and KD) experiments in defined differentiation system, single lab","pmids":["18832594"],"is_preprint":false},{"year":2011,"finding":"SOX1 suppresses neurogenic cell divisions in cortical neural progenitors by acting through a Prox1-mediated pathway; loss of Sox1 leads to progressive depletion of self-renewing cells, elongated cell cycle, and increased cell cycle exit, both in vivo and in vitro.","method":"Sox1-null mouse cortical neural progenitor cells; gain/loss-of-function; cell cycle analysis; Prox1 pathway epistasis","journal":"Stem Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro loss-of-function with pathway (Prox1) placement, single lab","pmids":["21280160"],"is_preprint":false},{"year":2012,"finding":"SOX1 functions as a tumor suppressor in hepatocellular carcinoma by physically interacting with beta-catenin (but not with the beta-catenin/TCF complex), inhibiting TCF-responsive transcriptional activity and downstream Wnt target gene expression; interaction demonstrated by GST pull-down, co-immunoprecipitation, and confocal co-localization.","method":"GST pull-down; co-immunoprecipitation; TCF-responsive luciferase reporter assay; Western blot; confocal microscopy","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal binding assays (GST pull-down, Co-IP, confocal), single lab","pmids":["22767186"],"is_preprint":false},{"year":2012,"finding":"SOX1 expression marks an activated radial astrocyte population in the dentate gyrus subgranular zone that gives rise to the majority of newly born granular neurons and a small number of hilar astrocytes, as established by lineage tracing.","method":"Sox1-tTA;tetO-Cre;Rosa26 reporter lineage tracing in mice","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous genetic lineage tracing with temporal control and long-term chase, clear functional outcome","pmids":["22992951"],"is_preprint":false},{"year":2014,"finding":"SOX1 physically interacts with beta-catenin (shown by Co-IP) and reduces its expression in a proteasome-independent manner in nasopharyngeal carcinoma cells, leading to inhibition of Wnt/beta-catenin signaling.","method":"Co-immunoprecipitation; Western blot; proteasome inhibitor treatment; TCF reporter assay","journal":"Molecular Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay and functional rescue, single lab","pmids":["25427424"],"is_preprint":false},{"year":2015,"finding":"Restoration of SOX1 expression in non-small cell lung cancer cells inhibits cell migration by regulating actin cytoskeletal remodeling.","method":"SOX1 re-expression in NSCLC cells; migration assay; actin cytoskeleton visualization","journal":"Tumour Biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single functional readout without molecular mechanism of actin regulation","pmids":["25613070"],"is_preprint":false},{"year":2020,"finding":"SOX1 is required for specification of rostral hindbrain neural progenitor cells from human embryonic stem cells; SOX1 knockout leads to upregulation of midbrain genes and downregulation of rostral hindbrain genes. ChIP-seq shows SOX1 binds the distal region of GBX2 to activate its expression, and GBX2 overexpression rescues SOX1-KO phenotypes.","method":"SOX1 knockout (hESC); ChIP-seq; GBX2 overexpression rescue; gene expression profiling","journal":"iScience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP-seq identifying direct SOX1 target (GBX2) combined with KO and genetic rescue, single lab with multiple orthogonal methods","pmids":["32905879"],"is_preprint":false},{"year":2020,"finding":"miR-155 suppresses SOX1 expression by targeting its 3'UTR, and MRTF-A promotes this suppression by binding the miR-155 promoter to promote histone acetylation and RNA polymerase II recruitment via the Wnt-beta-catenin pathway, thus forming an MRTF-A/miR-155/SOX1 axis that mediates gastric cancer migration.","method":"ChIP assay; luciferase reporter assay; 3'UTR targeting validation; transwell and scratch-healing migration assays","journal":"Cancer Cell International","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, reporter, migration assay) demonstrating pathway, single lab","pmids":["32675943"],"is_preprint":false},{"year":2022,"finding":"NKX2-1 and SOX1 collaborate as core transcriptional regulators in the SCLC-Aα subtype; co-immunoprecipitation followed by mass spectrometry identified SOX1 as a functional transcriptional partner of NKX2-1, and their co-activity maintains neural lineage state through super-enhancers at both loci.","method":"Co-immunoprecipitation followed by mass spectrometry; ChIP-seq; CRISPR-Cas9 deletion; xenograft","journal":"American Journal of Respiratory and Critical Care Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identifying direct partner, ChIP-seq for binding, single lab","pmids":["35848993"],"is_preprint":false},{"year":2023,"finding":"SOX1 directly binds the HES1 promoter (identified by ChIP-PCR) and suppresses HES1 transcription in lung cancer cells; HES1 overexpression partially reverses the tumor-suppressive effect of SOX1, establishing HES1 as a direct transcriptional target downstream of SOX1.","method":"ChIP-PCR; RNA-seq; HES1 rescue experiment; in vitro and xenograft assays","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct ChIP evidence for SOX1-HES1 binding plus phenotypic rescue, single lab","pmids":["37190139"],"is_preprint":false},{"year":2023,"finding":"SOX1 directly binds the MYC gene promoter, leading to transcriptional suppression of MYC; decreased SOX1 leads to MYC re-expression and re-entry into proliferation, establishing a SOX1-MYC axis in NPC quiescence and chemoresistance.","method":"Promoter binding assay (ChIP); luciferase reporter; quiescence/proliferation model","journal":"Cell Death Discovery","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct promoter binding shown by ChIP with functional validation, single lab","pmids":["37369660"],"is_preprint":false},{"year":2024,"finding":"USP2 stabilizes EZH2 by direct binding and reducing its ubiquitination; EZH2 then enriches H3K27me3 at the SOX1 promoter to epigenetically silence SOX1 expression, establishing a USP2-EZH2-SOX1 regulatory axis in bladder cancer progression.","method":"Co-immunoprecipitation; chromatin immunoprecipitation (ChIP); ubiquitination assay; xenograft model","journal":"Translational Oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for USP2-EZH2 interaction, ChIP for H3K27me3 at SOX1 locus, single lab with multiple methods","pmids":["39197387"],"is_preprint":false},{"year":2024,"finding":"WTAP mediates m6A modification of SOX1 mRNA, leading to YTHDF2-dependent mRNA degradation and post-transcriptional repression of SOX1 in colorectal cancer; this was confirmed by MeRIP assay, RNA pulldown, dual-luciferase reporter, and RIP assay.","method":"MeRIP assay; RNA pulldown; dual-luciferase reporter; RIP assay; mRNA stability assay","journal":"Digestive Diseases and Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal epitranscriptomic methods establishing m6A-YTHDF2-SOX1 axis, single lab","pmids":["39681745"],"is_preprint":false},{"year":2020,"finding":"SOX1 promotes differentiation of nasopharyngeal carcinoma cells by activating the retinoid metabolic pathway; RNA-seq and untargeted metabolomics showed increased retinoid content in SOX1-overexpressing cells, linked to decreased expression of UGT2B7, which partially rescues the SOX1-induced differentiation phenotype.","method":"RNA-seq; LC/MS untargeted metabolomics; UGT2B7 rescue experiment","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — orthogonal transcriptomic and metabolomic approaches with functional rescue, single lab","pmids":["32382038"],"is_preprint":false},{"year":2021,"finding":"miR-155-5p directly targets the 3'UTR of SOX1 to suppress its expression, resulting in activation of RAF/MEK/ERK phosphorylation and promotion of cholangiocarcinoma proliferation; restoration of SOX1 in miR-155-5p-overexpressing cells decreases RAF/MEK/ERK phosphorylation.","method":"Dual-luciferase reporter assay (3'UTR targeting); Western blot for pathway phosphorylation; cell proliferation and xenograft assays","journal":"Cancer Cell International","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3'UTR reporter plus downstream pathway validation, single lab","pmids":["34876142"],"is_preprint":false}],"current_model":"SOX1 is an HMG-box transcription factor that binds DNA through its HMG domain and recruits partner factors via its proximal C-terminal domain to activate target genes (e.g., gamma-crystallins, GBX2) or repress them (e.g., Hes1, MYC); it maintains neural progenitor identity by counteracting proneural bHLH proteins and suppressing Notch (via Hes1) and Wnt/beta-catenin (via direct beta-catenin binding) signaling, while in postmitotic neurons it is required for migration and subtype identity; its expression and activity are regulated post-transcriptionally by miRNAs (miR-155, miR-494-3p) and epigenetically via EZH2-mediated H3K27me3 and WTAP-mediated m6A modification, and its promoter is frequently hypermethylated in multiple cancers where loss of SOX1 de-represses oncogenic Wnt, Notch, and MAPK signaling."},"narrative":{"mechanistic_narrative":"SOX1 is an HMG-box transcription factor that governs neural progenitor identity and acts as a lineage-restricted tumor suppressor [PMID:9512512, PMID:14517545]. It binds DNA through its HMG box at the SRY consensus motif [PMID:8625802], but target-gene selectivity is conferred by its proximal C-terminal domain, which recruits a partner factor; chimeric SOX1/SOX9 swaps showed the C-terminus, not the HMG domain, determines specificity at the DC5 crystallin enhancer [PMID:9609835, PMID:9858536]. Through this architecture SOX1 directly activates structural target genes during lens development—it binds a conserved promoter element shared by gamma-crystallin genes, and its loss in mice produces microphthalmia and cataract from failed fiber-cell elongation, in part by repressing Pax6 [PMID:9512512, PMID:17306631]. In the CNS, SOX1 keeps neuroepithelial cells undifferentiated by counteracting proneural bHLH proteins and by restraining two signaling pathways: it directly binds the Hes1 promoter to suppress Notch output, and it physically binds beta-catenin to inhibit TCF/LEF-dependent Wnt transcription [PMID:14517545, PMID:15110721]. Beyond progenitor maintenance, SOX1 is required cell-autonomously in postmitotic ventral striatum neurons for their migration and subtype identity [PMID:15882093], marks adult dentate-gyrus radial astrocytes that generate granule neurons [PMID:22992951], and specifies rostral hindbrain fate by directly binding and activating GBX2 [PMID:32905879]. In cancers SOX1 re-expression suppresses tumor growth through the same effectors—direct repression of HES1 and MYC and beta-catenin binding that blocks Wnt signaling—while its promoter is silenced through EZH2-mediated H3K27me3 and its transcript is repressed post-transcriptionally by miR-155 and by WTAP-directed m6A modification [PMID:22767186, PMID:37190139, PMID:37369660, PMID:39197387, PMID:39681745]. SOX1 also partners with NKX2-1 to maintain neural-lineage state in small-cell lung cancer [PMID:35848993].","teleology":[{"year":1996,"claim":"Established that SOX1 is a sequence-specific DNA-binding protein recognizing the SRY consensus, defining it biochemically as an HMG-box transcription factor rather than just a sequence homolog.","evidence":"In vitro HMG-box DNA-binding assay comparing SOX1/2/3","pmids":["8625802"],"confidence":"Medium","gaps":["No in vivo target genes identified","Affinity differences not linked to functional output"]},{"year":1998,"claim":"Showed SOX1 is sufficient to impart neural fate and directly drives a structural target gene program, linking the factor to both neural determination and lens differentiation.","evidence":"Inducible expression in P19 cells; gamma-crystallin promoter interaction and knockout mice with microphthalmia/cataract; DC5 enhancer reporter with domain deletion","pmids":["9550729","9512512","9609835"],"confidence":"High","gaps":["Partner factor at crystallin promoters not yet identified","Mechanism of neural induction at target-gene level unresolved"]},{"year":1999,"claim":"Localized target-gene selectivity to the proximal C-terminal domain rather than the HMG box, establishing that SOX1 specificity arises from partner-factor recruitment.","evidence":"Chimeric SOX1/SOX9 proteins, SOX2-VP16 fusions, and DC5 enhancer reporters","pmids":["9858536"],"confidence":"High","gaps":["Identity of the proximal C-terminal partner factor not defined","Structural basis of the interaction unknown"]},{"year":2003,"claim":"Defined the core neural-progenitor function: SOX1-3 maintain the undifferentiated state by antagonizing proneural bHLH proteins in a mutually repressive circuit.","evidence":"Chick in ovo electroporation gain- and loss-of-function with neural markers","pmids":["14517545"],"confidence":"High","gaps":["Direct transcriptional targets mediating the antagonism not identified","SOX1-specific versus redundant roles not separated"]},{"year":2004,"claim":"Identified specific signaling effectors of SOX1's progenitor-maintaining activity—direct Hes1 repression (Notch) and beta-catenin binding (Wnt)—both requiring its C-terminus.","evidence":"Promoter-binding and reporter assays, Co-IP, and overexpression in neural progenitors","pmids":["15110721"],"confidence":"Medium","gaps":["beta-catenin interaction shown by Co-IP without structural mapping","SOX1 specificity over SOX2/3 at Hes1 not mechanistically explained"]},{"year":2005,"claim":"Extended SOX1 function beyond progenitors, showing a cell-autonomous requirement in postmitotic neurons for migration and subtype identity.","evidence":"Sox1-null beta-gal reporter and precursor-directed conditional rescue with in vivo fate/migration analysis","pmids":["15882093"],"confidence":"High","gaps":["Transcriptional targets controlling migration not identified","Link to cytoskeletal machinery unresolved"]},{"year":2009,"claim":"Placed SOX1 within domain-specific neural patterning circuits and connected it to self-renewal control via Hes1 and Prox1 pathways.","evidence":"Sox1-null mice and in vitro gain/loss-of-function with cell-fate and cell-cycle analysis; ES cell neural differentiation with OE/KD","pmids":["19723505","18832594","21280160"],"confidence":"Medium","gaps":["Direct versus indirect regulation of Prox1 pathway not resolved","How SOX1 is positioned downstream of PAX6/NKX2.2/Notch mechanistically unclear"]},{"year":2012,"claim":"Defined SOX1 as a tumor suppressor acting through beta-catenin binding, transferring its developmental Wnt-restraining function to a cancer context.","evidence":"GST pull-down, Co-IP, confocal co-localization, and TCF reporter assays in hepatocellular and nasopharyngeal carcinoma; in vivo lineage tracing of adult neural stem cells","pmids":["22767186","25427424","22992951"],"confidence":"Medium","gaps":["Mechanism of proteasome-independent beta-catenin reduction unexplained","Whether SOX1 sequesters or degrades beta-catenin not reconciled across contexts"]},{"year":2020,"claim":"Provided genome-wide direct-target evidence (GBX2) for SOX1 in regional neural specification and revealed metabolic and miRNA control of its activity.","evidence":"SOX1 KO hESCs with ChIP-seq and GBX2 rescue; RNA-seq/metabolomics for retinoid pathway; ChIP/reporter for MRTF-A/miR-155 axis","pmids":["32905879","32382038","32675943"],"confidence":"High","gaps":["Full SOX1 cistrome beyond GBX2 not characterized","Whether retinoid pathway activation is a direct transcriptional effect unknown"]},{"year":2023,"claim":"Consolidated SOX1's tumor-suppressive transcriptional logic by demonstrating direct repression of HES1 and MYC with phenotypic rescue.","evidence":"ChIP-PCR, RNA-seq, luciferase reporters, and HES1/MYC rescue in lung and nasopharyngeal cancer models","pmids":["37190139","37369660"],"confidence":"Medium","gaps":["Cofactor requirements for repression not defined","Whether MYC/HES1 repression is direct in normal neural cells untested"]},{"year":2024,"claim":"Mapped the upstream silencing of SOX1 in cancer to converging epigenetic (EZH2/H3K27me3) and epitranscriptomic (WTAP m6A/YTHDF2) mechanisms.","evidence":"Co-IP, ChIP, and ubiquitination assays for USP2-EZH2-SOX1; MeRIP, RNA pulldown, RIP, and stability assays for WTAP/m6A","pmids":["39197387","39681745"],"confidence":"Medium","gaps":["Whether these silencing mechanisms operate in normal development unknown","Interplay between H3K27me3 and m6A control of SOX1 not addressed"]},{"year":null,"claim":"The identity of the proximal C-terminal partner factor that confers SOX1 target-gene selectivity, and a unified structural model of how SOX1 both activates (crystallins, GBX2) and represses (Hes1, MYC, beta-catenin output) targets, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of SOX1 with DNA or partner factor","Mechanistic switch between activator and repressor modes undefined","Genome-wide cistrome and direct partner proteome incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,5,6,17,20,21]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,3,6,17,20,21]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8,13]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,6,17,20,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,3,5,7,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,13,15,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[13,20,21,22,23]}],"complexes":[],"partners":["CTNNB1","NKX2-1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00570","full_name":"Transcription factor SOX-1","aliases":[],"length_aa":391,"mass_kda":39.0,"function":"Transcriptional activator. May function as a switch in neuronal development. Keeps neural cells undifferentiated by counteracting the activity of proneural proteins and suppresses neuronal differentiation (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O00570/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SOX1","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SOX1","total_profiled":1310},"omim":[{"mim_id":"621285","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL DOMINANT 76; MRD76","url":"https://www.omim.org/entry/621285"},{"mim_id":"619148","title":"CHROMOSOME 13q33-q34 DELETION SYNDROME","url":"https://www.omim.org/entry/619148"},{"mim_id":"610086","title":"PROTEIN ARGININE METHYLTRANSFERASE 8; PRMT8","url":"https://www.omim.org/entry/610086"},{"mim_id":"605923","title":"SRY-BOX 8; SOX8","url":"https://www.omim.org/entry/605923"},{"mim_id":"604974","title":"SRY-BOX 21; SOX21","url":"https://www.omim.org/entry/604974"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"brain","ntpm":3.9}],"url":"https://www.proteinatlas.org/search/SOX1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O00570","domains":[{"cath_id":"1.10.30.10","chopping":"52-117","consensus_level":"medium","plddt":96.0323,"start":52,"end":117}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00570","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00570-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00570-F1-predicted_aligned_error_v6.png","plddt_mean":56.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SOX1","jax_strain_url":"https://www.jax.org/strain/search?query=SOX1"},"sequence":{"accession":"O00570","fasta_url":"https://rest.uniprot.org/uniprotkb/O00570.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00570/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00570"}},"corpus_meta":[{"pmid":"14517545","id":"PMC_14517545","title":"Vertebrate neurogenesis is counteracted by Sox1-3 activity.","date":"2003","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/14517545","citation_count":668,"is_preprint":false},{"pmid":"10446282","id":"PMC_10446282","title":"Comparative expression of the mouse Sox1, Sox2 and Sox3 genes from pre-gastrulation to early somite stages.","date":"1999","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/10446282","citation_count":442,"is_preprint":false},{"pmid":"8625802","id":"PMC_8625802","title":"A comparison of the properties of Sox-3 with Sry and two related genes, Sox-1 and Sox-2.","date":"1996","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/8625802","citation_count":385,"is_preprint":false},{"pmid":"9550729","id":"PMC_9550729","title":"A role for SOX1 in neural determination.","date":"1998","source":"Development (Cambridge, 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/31315840","citation_count":3,"is_preprint":false},{"pmid":"36324062","id":"PMC_36324062","title":"SOX-1 antibodies in a patient with Crohn's disease: a case report.","date":"2022","source":"BMC neurology","url":"https://pubmed.ncbi.nlm.nih.gov/36324062","citation_count":3,"is_preprint":false},{"pmid":"39850527","id":"PMC_39850527","title":"Methylation of SOX1 and PAX1 Are Risk Factors and Potential Biomarkers for Cervical Lesions.","date":"2024","source":"World journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/39850527","citation_count":2,"is_preprint":false},{"pmid":"40259371","id":"PMC_40259371","title":"Meta-analysis of the diagnostic value of SOX1 methylation in different types of cervical cancer.","date":"2025","source":"World journal of surgical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40259371","citation_count":2,"is_preprint":false},{"pmid":"40699796","id":"PMC_40699796","title":"Hypermethylation of SOX1 and HOXA9 Genes Is Associated with Clinicopathologic Characteristics of Non-Small Cell Lung Cancer Patients.","date":"2025","source":"Current issues in molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/40699796","citation_count":2,"is_preprint":false},{"pmid":"35989271","id":"PMC_35989271","title":"Anti-SOX1 Antibody-positive Small-cell Lung Cancer That Triggered Opsoclonus.","date":"2022","source":"Internal medicine (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/35989271","citation_count":2,"is_preprint":false},{"pmid":"33229831","id":"PMC_33229831","title":"[A case of anti-SRY-Related HMG-Box Gene 1 (SOX1) antibody-positive chorea].","date":"2020","source":"Rinsho shinkeigaku = Clinical neurology","url":"https://pubmed.ncbi.nlm.nih.gov/33229831","citation_count":2,"is_preprint":false},{"pmid":"38497229","id":"PMC_38497229","title":"SOX-1 antibodies positive Lambert-Eaton myasthenic syndrome with occult small cell lung cancer: A case report.","date":"2024","source":"The clinical respiratory journal","url":"https://pubmed.ncbi.nlm.nih.gov/38497229","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48961,"output_tokens":5619,"usd":0.115584,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14185,"output_tokens":3843,"usd":0.0835,"stage2_stop_reason":"end_turn"},"total_usd":0.199084,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"SOX1 protein binds the same DNA sequence motif as SRY via its HMG box domain, but with different affinity compared to SOX2 and SOX3, as demonstrated by in vitro DNA-binding assays.\",\n      \"method\": \"In vitro DNA-binding assay (HMG box binding to DNA motif)\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro binding assay, single lab, single method\",\n      \"pmids\": [\"8625802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SOX1 misexpression in P19 cells substitutes for retinoic acid in imparting neural fate to competent ectodermal cells, establishing SOX1 as sufficient for neural determination in this in vitro neurogenesis model.\",\n      \"method\": \"Inducible expression system in P19 cells; neural marker immunostaining and BrdU labeling\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in cell culture with multiple orthogonal markers, single lab\",\n      \"pmids\": [\"9550729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SOX1, SOX2, and SOX3 together account for the deltaEF2 factors that activate the delta1-crystallin minimal enhancer DC5 in lens cells, and this activation depends on their C-terminal domains.\",\n      \"method\": \"Enhancer reporter assay; domain deletion analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reporter assay with domain mapping, replicated across SOX1/2/3, single lab\",\n      \"pmids\": [\"9609835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Targeted deletion of Sox1 in mice causes microphthalmia and cataract with failure of lens fiber cell elongation; SOX1 directly interacts with a promoter element conserved in all gamma-crystallin genes to drive their expression.\",\n      \"method\": \"Gene targeting (knockout mice); promoter binding/interaction assay\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo loss-of-function with defined phenotype plus direct promoter interaction, replicated across multiple gamma-crystallin genes\",\n      \"pmids\": [\"9512512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The proximal portion of the SOX1 C-terminal domain specifically interacts with a partner factor to confer target-gene selectivity; the HMG domain alone is insufficient for specificity. Chimeric SOX1/SOX9 proteins showed that DC5 enhancer activation requires the SOX1 C-terminal domain regardless of HMG domain origin.\",\n      \"method\": \"Chimeric protein analysis; enhancer reporter assay; SOX2-VP16 fusion experiments\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with chimeric proteins and multiple mutagenesis/reporter approaches, mechanistic detail on partner-factor interaction\",\n      \"pmids\": [\"9858536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SOX1-3 transcription factors keep neural cells undifferentiated by counteracting the activity of proneural bHLH proteins; conversely, proneural proteins direct neuronal differentiation by suppressing Sox1-3 expression in CNS progenitors.\",\n      \"method\": \"Chick in ovo electroporation (gain- and loss-of-function); neural marker analysis\",\n      \"journal\": \"Nature Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo epistasis by electroporation, bidirectional suppression demonstrated, widely replicated\",\n      \"pmids\": [\"14517545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SOX1 (but not SOX2 or SOX3) directly binds the Hes1 promoter and suppresses Hes1 transcription, thereby attenuating Notch signaling; SOX1 also physically binds beta-catenin and suppresses TCF/LEF signaling. Both interactions require the C-terminus of SOX1. Additionally, SOX1 promotes cell cycle exit and upregulates neurogenin 1 transcription.\",\n      \"method\": \"Promoter-binding assay; overexpression in cultured neural progenitor cells; reporter assay; co-immunoprecipitation\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP-like binding, Co-IP, reporter assay) in single lab\",\n      \"pmids\": [\"15110721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SOX1 is required in postmitotic ventral striatum neurons (not only progenitors) for their migration to correct position and acquisition of subtype identity; Sox1-null mice lack ventral striatum neurons due to a migration failure rather than a differentiation defect in precursors.\",\n      \"method\": \"Sox1-null allele expressing beta-galactosidase; conditional Sox1 expression directed to precursors; cell fate and migration analysis in vivo\",\n      \"journal\": \"PLoS Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic rescue experiments, lineage tracing, clear postmitotic requirement established\",\n      \"pmids\": [\"15882093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SOX1 is identified as the antigen recognized by anti-glial nuclear antibody (AGNA)-positive sera; IgG eluted from SOX1 clones reproduced the characteristic cerebellar Bergmann glia nuclear immunoreactivity.\",\n      \"method\": \"Fetal brain cDNA library probing; immunoblot of phage plaques; IgG elution and tissue immunostaining\",\n      \"journal\": \"Neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — antigen identification by cDNA library screening plus functional validation by IgG elution and tissue staining, replicated in large patient cohort\",\n      \"pmids\": [\"18032743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In Sox1-null lens fiber cells, Pax6 is inappropriately maintained and its target alpha5 integrin is misexpressed; Sox1 heterozygosity partially rescues Pax6(Sey) lens diameter, demonstrating a genetic interaction between Sox1 and Pax6 in which Sox1 normally represses Pax6 during fiber cell differentiation.\",\n      \"method\": \"Immunostaining of Sox1-null mouse lenses; genetic rescue (double mutant analysis)\",\n      \"journal\": \"Gene Expression Patterns\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic epistasis with double mutant, single lab\",\n      \"pmids\": [\"17306631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"During the neuron-to-glial fate switch in ventral spinal cord, SOX1 expression is regulated downstream of PAX6, NKX2.2, and Notch signaling in a domain-specific manner; SOX1 in turn regulates Hes1 expression, and loss of Sox1 leads to enhanced oligodendrocyte precursor production from pMN domain.\",\n      \"method\": \"In vivo loss-of-function (Sox1 null mice); in vitro gain-of-function; cell-fate marker analysis\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic loss-of-function with pathway placement, single lab\",\n      \"pmids\": [\"19723505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In mouse embryonic stem cell differentiation, Sox1 maintains cells at the neuroepithelial stage and prevents expression of Pax6 and radial glial markers; continuous Sox1 expression blocks the Sox1→Pax6 transition, while Pax6 expression in neuroepithelial cells triggers their differentiation into radial glia and promotes cell migration.\",\n      \"method\": \"Overexpression and knockdown (shRNA) in ES cell neural differentiation assays; marker immunostaining\",\n      \"journal\": \"Stem Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional (OE and KD) experiments in defined differentiation system, single lab\",\n      \"pmids\": [\"18832594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SOX1 suppresses neurogenic cell divisions in cortical neural progenitors by acting through a Prox1-mediated pathway; loss of Sox1 leads to progressive depletion of self-renewing cells, elongated cell cycle, and increased cell cycle exit, both in vivo and in vitro.\",\n      \"method\": \"Sox1-null mouse cortical neural progenitor cells; gain/loss-of-function; cell cycle analysis; Prox1 pathway epistasis\",\n      \"journal\": \"Stem Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro loss-of-function with pathway (Prox1) placement, single lab\",\n      \"pmids\": [\"21280160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX1 functions as a tumor suppressor in hepatocellular carcinoma by physically interacting with beta-catenin (but not with the beta-catenin/TCF complex), inhibiting TCF-responsive transcriptional activity and downstream Wnt target gene expression; interaction demonstrated by GST pull-down, co-immunoprecipitation, and confocal co-localization.\",\n      \"method\": \"GST pull-down; co-immunoprecipitation; TCF-responsive luciferase reporter assay; Western blot; confocal microscopy\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal binding assays (GST pull-down, Co-IP, confocal), single lab\",\n      \"pmids\": [\"22767186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX1 expression marks an activated radial astrocyte population in the dentate gyrus subgranular zone that gives rise to the majority of newly born granular neurons and a small number of hilar astrocytes, as established by lineage tracing.\",\n      \"method\": \"Sox1-tTA;tetO-Cre;Rosa26 reporter lineage tracing in mice\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous genetic lineage tracing with temporal control and long-term chase, clear functional outcome\",\n      \"pmids\": [\"22992951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SOX1 physically interacts with beta-catenin (shown by Co-IP) and reduces its expression in a proteasome-independent manner in nasopharyngeal carcinoma cells, leading to inhibition of Wnt/beta-catenin signaling.\",\n      \"method\": \"Co-immunoprecipitation; Western blot; proteasome inhibitor treatment; TCF reporter assay\",\n      \"journal\": \"Molecular Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay and functional rescue, single lab\",\n      \"pmids\": [\"25427424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Restoration of SOX1 expression in non-small cell lung cancer cells inhibits cell migration by regulating actin cytoskeletal remodeling.\",\n      \"method\": \"SOX1 re-expression in NSCLC cells; migration assay; actin cytoskeleton visualization\",\n      \"journal\": \"Tumour Biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single functional readout without molecular mechanism of actin regulation\",\n      \"pmids\": [\"25613070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX1 is required for specification of rostral hindbrain neural progenitor cells from human embryonic stem cells; SOX1 knockout leads to upregulation of midbrain genes and downregulation of rostral hindbrain genes. ChIP-seq shows SOX1 binds the distal region of GBX2 to activate its expression, and GBX2 overexpression rescues SOX1-KO phenotypes.\",\n      \"method\": \"SOX1 knockout (hESC); ChIP-seq; GBX2 overexpression rescue; gene expression profiling\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP-seq identifying direct SOX1 target (GBX2) combined with KO and genetic rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"32905879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-155 suppresses SOX1 expression by targeting its 3'UTR, and MRTF-A promotes this suppression by binding the miR-155 promoter to promote histone acetylation and RNA polymerase II recruitment via the Wnt-beta-catenin pathway, thus forming an MRTF-A/miR-155/SOX1 axis that mediates gastric cancer migration.\",\n      \"method\": \"ChIP assay; luciferase reporter assay; 3'UTR targeting validation; transwell and scratch-healing migration assays\",\n      \"journal\": \"Cancer Cell International\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, reporter, migration assay) demonstrating pathway, single lab\",\n      \"pmids\": [\"32675943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NKX2-1 and SOX1 collaborate as core transcriptional regulators in the SCLC-Aα subtype; co-immunoprecipitation followed by mass spectrometry identified SOX1 as a functional transcriptional partner of NKX2-1, and their co-activity maintains neural lineage state through super-enhancers at both loci.\",\n      \"method\": \"Co-immunoprecipitation followed by mass spectrometry; ChIP-seq; CRISPR-Cas9 deletion; xenograft\",\n      \"journal\": \"American Journal of Respiratory and Critical Care Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identifying direct partner, ChIP-seq for binding, single lab\",\n      \"pmids\": [\"35848993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SOX1 directly binds the HES1 promoter (identified by ChIP-PCR) and suppresses HES1 transcription in lung cancer cells; HES1 overexpression partially reverses the tumor-suppressive effect of SOX1, establishing HES1 as a direct transcriptional target downstream of SOX1.\",\n      \"method\": \"ChIP-PCR; RNA-seq; HES1 rescue experiment; in vitro and xenograft assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct ChIP evidence for SOX1-HES1 binding plus phenotypic rescue, single lab\",\n      \"pmids\": [\"37190139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SOX1 directly binds the MYC gene promoter, leading to transcriptional suppression of MYC; decreased SOX1 leads to MYC re-expression and re-entry into proliferation, establishing a SOX1-MYC axis in NPC quiescence and chemoresistance.\",\n      \"method\": \"Promoter binding assay (ChIP); luciferase reporter; quiescence/proliferation model\",\n      \"journal\": \"Cell Death Discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct promoter binding shown by ChIP with functional validation, single lab\",\n      \"pmids\": [\"37369660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP2 stabilizes EZH2 by direct binding and reducing its ubiquitination; EZH2 then enriches H3K27me3 at the SOX1 promoter to epigenetically silence SOX1 expression, establishing a USP2-EZH2-SOX1 regulatory axis in bladder cancer progression.\",\n      \"method\": \"Co-immunoprecipitation; chromatin immunoprecipitation (ChIP); ubiquitination assay; xenograft model\",\n      \"journal\": \"Translational Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for USP2-EZH2 interaction, ChIP for H3K27me3 at SOX1 locus, single lab with multiple methods\",\n      \"pmids\": [\"39197387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WTAP mediates m6A modification of SOX1 mRNA, leading to YTHDF2-dependent mRNA degradation and post-transcriptional repression of SOX1 in colorectal cancer; this was confirmed by MeRIP assay, RNA pulldown, dual-luciferase reporter, and RIP assay.\",\n      \"method\": \"MeRIP assay; RNA pulldown; dual-luciferase reporter; RIP assay; mRNA stability assay\",\n      \"journal\": \"Digestive Diseases and Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal epitranscriptomic methods establishing m6A-YTHDF2-SOX1 axis, single lab\",\n      \"pmids\": [\"39681745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX1 promotes differentiation of nasopharyngeal carcinoma cells by activating the retinoid metabolic pathway; RNA-seq and untargeted metabolomics showed increased retinoid content in SOX1-overexpressing cells, linked to decreased expression of UGT2B7, which partially rescues the SOX1-induced differentiation phenotype.\",\n      \"method\": \"RNA-seq; LC/MS untargeted metabolomics; UGT2B7 rescue experiment\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — orthogonal transcriptomic and metabolomic approaches with functional rescue, single lab\",\n      \"pmids\": [\"32382038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-155-5p directly targets the 3'UTR of SOX1 to suppress its expression, resulting in activation of RAF/MEK/ERK phosphorylation and promotion of cholangiocarcinoma proliferation; restoration of SOX1 in miR-155-5p-overexpressing cells decreases RAF/MEK/ERK phosphorylation.\",\n      \"method\": \"Dual-luciferase reporter assay (3'UTR targeting); Western blot for pathway phosphorylation; cell proliferation and xenograft assays\",\n      \"journal\": \"Cancer Cell International\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3'UTR reporter plus downstream pathway validation, single lab\",\n      \"pmids\": [\"34876142\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOX1 is an HMG-box transcription factor that binds DNA through its HMG domain and recruits partner factors via its proximal C-terminal domain to activate target genes (e.g., gamma-crystallins, GBX2) or repress them (e.g., Hes1, MYC); it maintains neural progenitor identity by counteracting proneural bHLH proteins and suppressing Notch (via Hes1) and Wnt/beta-catenin (via direct beta-catenin binding) signaling, while in postmitotic neurons it is required for migration and subtype identity; its expression and activity are regulated post-transcriptionally by miRNAs (miR-155, miR-494-3p) and epigenetically via EZH2-mediated H3K27me3 and WTAP-mediated m6A modification, and its promoter is frequently hypermethylated in multiple cancers where loss of SOX1 de-represses oncogenic Wnt, Notch, and MAPK signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SOX1 is an HMG-box transcription factor that governs neural progenitor identity and acts as a lineage-restricted tumor suppressor [#3, #5]. It binds DNA through its HMG box at the SRY consensus motif [#0], but target-gene selectivity is conferred by its proximal C-terminal domain, which recruits a partner factor; chimeric SOX1/SOX9 swaps showed the C-terminus, not the HMG domain, determines specificity at the DC5 crystallin enhancer [#2, #4]. Through this architecture SOX1 directly activates structural target genes during lens development—it binds a conserved promoter element shared by gamma-crystallin genes, and its loss in mice produces microphthalmia and cataract from failed fiber-cell elongation, in part by repressing Pax6 [#3, #9]. In the CNS, SOX1 keeps neuroepithelial cells undifferentiated by counteracting proneural bHLH proteins and by restraining two signaling pathways: it directly binds the Hes1 promoter to suppress Notch output, and it physically binds beta-catenin to inhibit TCF/LEF-dependent Wnt transcription [#5, #6]. Beyond progenitor maintenance, SOX1 is required cell-autonomously in postmitotic ventral striatum neurons for their migration and subtype identity [#7], marks adult dentate-gyrus radial astrocytes that generate granule neurons [#14], and specifies rostral hindbrain fate by directly binding and activating GBX2 [#17]. In cancers SOX1 re-expression suppresses tumor growth through the same effectors—direct repression of HES1 and MYC and beta-catenin binding that blocks Wnt signaling—while its promoter is silenced through EZH2-mediated H3K27me3 and its transcript is repressed post-transcriptionally by miR-155 and by WTAP-directed m6A modification [#13, #20, #21, #22, #23]. SOX1 also partners with NKX2-1 to maintain neural-lineage state in small-cell lung cancer [#19].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that SOX1 is a sequence-specific DNA-binding protein recognizing the SRY consensus, defining it biochemically as an HMG-box transcription factor rather than just a sequence homolog.\",\n      \"evidence\": \"In vitro HMG-box DNA-binding assay comparing SOX1/2/3\",\n      \"pmids\": [\"8625802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo target genes identified\", \"Affinity differences not linked to functional output\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed SOX1 is sufficient to impart neural fate and directly drives a structural target gene program, linking the factor to both neural determination and lens differentiation.\",\n      \"evidence\": \"Inducible expression in P19 cells; gamma-crystallin promoter interaction and knockout mice with microphthalmia/cataract; DC5 enhancer reporter with domain deletion\",\n      \"pmids\": [\"9550729\", \"9512512\", \"9609835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Partner factor at crystallin promoters not yet identified\", \"Mechanism of neural induction at target-gene level unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Localized target-gene selectivity to the proximal C-terminal domain rather than the HMG box, establishing that SOX1 specificity arises from partner-factor recruitment.\",\n      \"evidence\": \"Chimeric SOX1/SOX9 proteins, SOX2-VP16 fusions, and DC5 enhancer reporters\",\n      \"pmids\": [\"9858536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the proximal C-terminal partner factor not defined\", \"Structural basis of the interaction unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the core neural-progenitor function: SOX1-3 maintain the undifferentiated state by antagonizing proneural bHLH proteins in a mutually repressive circuit.\",\n      \"evidence\": \"Chick in ovo electroporation gain- and loss-of-function with neural markers\",\n      \"pmids\": [\"14517545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating the antagonism not identified\", \"SOX1-specific versus redundant roles not separated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified specific signaling effectors of SOX1's progenitor-maintaining activity—direct Hes1 repression (Notch) and beta-catenin binding (Wnt)—both requiring its C-terminus.\",\n      \"evidence\": \"Promoter-binding and reporter assays, Co-IP, and overexpression in neural progenitors\",\n      \"pmids\": [\"15110721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"beta-catenin interaction shown by Co-IP without structural mapping\", \"SOX1 specificity over SOX2/3 at Hes1 not mechanistically explained\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended SOX1 function beyond progenitors, showing a cell-autonomous requirement in postmitotic neurons for migration and subtype identity.\",\n      \"evidence\": \"Sox1-null beta-gal reporter and precursor-directed conditional rescue with in vivo fate/migration analysis\",\n      \"pmids\": [\"15882093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets controlling migration not identified\", \"Link to cytoskeletal machinery unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed SOX1 within domain-specific neural patterning circuits and connected it to self-renewal control via Hes1 and Prox1 pathways.\",\n      \"evidence\": \"Sox1-null mice and in vitro gain/loss-of-function with cell-fate and cell-cycle analysis; ES cell neural differentiation with OE/KD\",\n      \"pmids\": [\"19723505\", \"18832594\", \"21280160\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect regulation of Prox1 pathway not resolved\", \"How SOX1 is positioned downstream of PAX6/NKX2.2/Notch mechanistically unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined SOX1 as a tumor suppressor acting through beta-catenin binding, transferring its developmental Wnt-restraining function to a cancer context.\",\n      \"evidence\": \"GST pull-down, Co-IP, confocal co-localization, and TCF reporter assays in hepatocellular and nasopharyngeal carcinoma; in vivo lineage tracing of adult neural stem cells\",\n      \"pmids\": [\"22767186\", \"25427424\", \"22992951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of proteasome-independent beta-catenin reduction unexplained\", \"Whether SOX1 sequesters or degrades beta-catenin not reconciled across contexts\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Provided genome-wide direct-target evidence (GBX2) for SOX1 in regional neural specification and revealed metabolic and miRNA control of its activity.\",\n      \"evidence\": \"SOX1 KO hESCs with ChIP-seq and GBX2 rescue; RNA-seq/metabolomics for retinoid pathway; ChIP/reporter for MRTF-A/miR-155 axis\",\n      \"pmids\": [\"32905879\", \"32382038\", \"32675943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full SOX1 cistrome beyond GBX2 not characterized\", \"Whether retinoid pathway activation is a direct transcriptional effect unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Consolidated SOX1's tumor-suppressive transcriptional logic by demonstrating direct repression of HES1 and MYC with phenotypic rescue.\",\n      \"evidence\": \"ChIP-PCR, RNA-seq, luciferase reporters, and HES1/MYC rescue in lung and nasopharyngeal cancer models\",\n      \"pmids\": [\"37190139\", \"37369660\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofactor requirements for repression not defined\", \"Whether MYC/HES1 repression is direct in normal neural cells untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped the upstream silencing of SOX1 in cancer to converging epigenetic (EZH2/H3K27me3) and epitranscriptomic (WTAP m6A/YTHDF2) mechanisms.\",\n      \"evidence\": \"Co-IP, ChIP, and ubiquitination assays for USP2-EZH2-SOX1; MeRIP, RNA pulldown, RIP, and stability assays for WTAP/m6A\",\n      \"pmids\": [\"39197387\", \"39681745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these silencing mechanisms operate in normal development unknown\", \"Interplay between H3K27me3 and m6A control of SOX1 not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the proximal C-terminal partner factor that confers SOX1 target-gene selectivity, and a unified structural model of how SOX1 both activates (crystallins, GBX2) and represses (Hes1, MYC, beta-catenin output) targets, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of SOX1 with DNA or partner factor\", \"Mechanistic switch between activator and repressor modes undefined\", \"Genome-wide cistrome and direct partner proteome incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 5, 6, 17, 20, 21]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 3, 6, 17, 20, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 6, 17, 20, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 3, 5, 7, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 13, 15, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [13, 20, 21, 22, 23]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTNNB1\", \"NKX2-1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}