{"gene":"INTS6","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":2021,"finding":"Crystal structure of the INTS3 C-terminus in complex with the INTS6 C-terminus (at 2.4 Å resolution) revealed that two INTS3c subunits dimerize and interact with INTS6c via conserved residues; INTS3 dimerization is required for recognizing longer ssDNA, and disruption of the INTS3c/INTS6c interaction impairs DSB repair.","method":"X-ray crystallography, biochemical assays (EMSA, mutagenesis), DSB repair functional assays","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis and functional DSB repair assays in a single study","pmids":["34400606"],"is_preprint":false},{"year":2024,"finding":"INTS6 associates with the heterotrimeric SOSS1 complex (INTS3, INIP, hSSB1) to form a tetrameric SOSS1 complex; INTS6 binds DNA:RNA hybrids, promotes PP2A recruitment to DSBs facilitating RNAPII dephosphorylation, prevents accumulation of damage-associated RNA transcripts, and recruits senataxin (SETX) to DSBs to resolve R-loops.","method":"Co-immunoprecipitation, in vitro binding/biochemical assays, proximity ligation, functional DSB repair assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, biochemical binding, functional rescue) in a single study","pmids":["39445827"],"is_preprint":false},{"year":2023,"finding":"IntS6 (Drosophila ortholog of INTS6) over-expression blocks Integrator function at a subset of protein-coding genes by titrating PP2A subunits, thereby inhibiting Integrator phosphatase module activity only at loci where phosphatase activity is required for premature transcription termination; it has no effect on snRNA processing or attenuation at other loci.","method":"Genetic over-expression in Drosophila, RNA-seq, ChIP-seq, epistasis with canonical PP2A B-subunit over-expression","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis plus transcriptomic and ChIP readouts, replicated with PP2A B-subunit controls","pmids":["37995689"],"is_preprint":false},{"year":2001,"finding":"DICE1 (INTS6) encodes a protein containing a DEAD-box helicase motif and other helicase superfamily II motifs; GFP-fusion protein localizes preferentially to the nucleus, suggesting involvement in nuclear RNA processes.","method":"GFP fusion protein live-cell imaging, genomic/cDNA sequence analysis","journal":"Oncology research","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization experiment (GFP imaging) without functional epistasis","pmids":["11939413"],"is_preprint":false},{"year":1998,"finding":"DBI-1 (mouse ortholog of INTS6/DICE1) protein localizes to the nucleus and, when overexpressed, diminishes the mitogenic response to IGF-1 in cells expressing the wild-type IGF-1 receptor.","method":"Immunofluorescence, overexpression, proliferation assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization and functional overexpression phenotype in a single lab","pmids":["9473344"],"is_preprint":false},{"year":2004,"finding":"Ectopic expression of DICE1 (INTS6) via GFP-fusion constructs inhibits colony formation in lung carcinoma and prostate carcinoma cell lines, and suppresses anchorage-independent growth of IGF-IR-transformed cells dependent on IGF-I signaling.","method":"Colony formation assay, soft-agar growth assay, GFP-fusion overexpression","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 3 — functional overexpression with defined cellular phenotype (growth suppression) but limited mechanistic pathway detail","pmids":["15254679"],"is_preprint":false},{"year":2009,"finding":"Re-expression of INTS6 in androgen-independent prostate cancer cells suppresses colony formation and causes G1 cell-cycle arrest; expression profiling revealed up-regulation of Wnt inhibitor CXXC4, FZD7, TCF7L1, and down-regulation of cyclin D1, linking INTS6 function to Wnt signaling and cell-cycle regulation.","method":"Colony formation assay, cell cycle analysis (FACS), gene expression profiling","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2/3 — overexpression with defined phenotype plus expression profiling placing INTS6 in Wnt/cell-cycle pathway","pmids":["19906297"],"is_preprint":false},{"year":2013,"finding":"Loss of Ints6 (zebrafish ortholog) from maternal stores causes widespread de-repression of dorsal organizer genes, failure to maintain BMP ligand expression and vox/ved expression, delayed gastrulation cell movements, and severe dorsalization; restoring BMP signaling or limiting Nodal signaling rescues wild-type patterning, placing Ints6 upstream of BMP/Nodal balance in vertebrate embryonic dorsoventral patterning.","method":"Maternal-effect recessive mutation analysis in zebrafish, genetic epistasis (BMP/Nodal modulation rescue), in situ hybridization","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function (maternal-effect mutation) with genetic epistasis and defined developmental phenotype","pmids":["24204286"],"is_preprint":false},{"year":2006,"finding":"RNAi of the C. elegans INTS6 ortholog DIC-1 causes embryonic lethality with increased apoptosis and abnormal morphogenesis; DIC-1 localizes to the inner mitochondrial membrane, and its loss results in abnormal mitochondrial cristae morphology and internal vesicles, demonstrating a role in maintaining inner mitochondrial membrane topology.","method":"RNAi, cryoelectron microscopy, immunofluorescence, genetic interaction with ced-3","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — RNAi loss-of-function with ultrastructural (cryo-EM) localization evidence; C. elegans ortholog may have divergent mitochondrial function vs. mammalian INTS6","pmids":["16914495"],"is_preprint":false},{"year":2013,"finding":"EBV-encoded miR-BART3* directly targets the 3'-UTR of DICE1 (INTS6) mRNA, causing down-regulation of DICE1 protein; inhibiting endogenous miR-BART3* with anti-miR oligonucleotides restored DICE1 expression, and forced miR-BART3* expression overcame DICE1 growth suppression and stimulated cell proliferation.","method":"3'-UTR reporter assay, anti-miR oligonucleotide inhibition, western blot, proliferation assay","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3'-UTR targeting validated by gain- and loss-of-function experiments with functional readout","pmids":["23280823"],"is_preprint":false},{"year":2015,"finding":"INTS6 and its pseudogene INTS6P1 are reciprocally regulated through competition for oncomiR-17-5p (ceRNA mechanism); miR-17-5p targets both, and INTS6P1 acts as a competing endogenous RNA to derepress INTS6 in hepatocellular carcinoma.","method":"miRNA target reporter assay, overexpression/knockdown, growth/migration assays, in vivo xenograft","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2/3 — ceRNA mechanism supported by reporter assays and functional rescue but single lab","pmids":["25686840"],"is_preprint":false},{"year":2018,"finding":"Small activating RNA targeting the INTS6 promoter (dsRNA-915) upregulates INTS6 expression in castration-resistant prostate cancer cells, suppresses proliferation and motility, and downregulates Wnt/β-catenin signaling; impairment of β-catenin degradation reverses these tumor suppressor effects, placing INTS6 function upstream of β-catenin.","method":"Small activating RNA transfection, cell proliferation/migration assays, western blot (β-catenin pathway)","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 3 — functional gain-of-expression with β-catenin rescue epistasis; single lab, limited mechanistic resolution","pmids":["29895194"],"is_preprint":false},{"year":2021,"finding":"INTS6 knockdown in colorectal cancer cells induces G1/S cell-cycle arrest and suppresses tumor growth; overexpression increases phospho-AKT and phospho-ERK levels, and pharmacological AKT or ERK inhibitors block the growth-promoting effect, placing INTS6 upstream of PI3K/AKT and MAPK pathways regulating c-Myc and CDK2.","method":"siRNA knockdown, overexpression, western blot (p-AKT, p-ERK), kinase inhibitor rescue, xenograft assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2/3 — bidirectional manipulation with pathway inhibitor epistasis; single lab","pmids":["34508742"],"is_preprint":false},{"year":2024,"finding":"In C. elegans, INTS-6 is required for RAD-51 foci formation upon X-ray irradiation and for CDK-1 Tyr-15 phosphorylation, placing the Integrator subunit 6 in the DNA damage response pathway upstream of CDK-1 regulation.","method":"RNAi/loss-of-function in C. elegans, immunofluorescence (RAD-51 foci), western blot (CDK-1 pTyr15)","journal":"microPublication biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct loss-of-function with two orthogonal molecular readouts in a C. elegans ortholog","pmids":["39575199"],"is_preprint":false},{"year":2025,"finding":"Conditional knockout of Ints6 in mouse nervous system disrupts early neurogenesis, cortical lamination, and synaptic development, with increased apoptosis in cortical layer 6 and altered RNAPII dynamics; CDK9 inhibitor treatment reduces RNAPII phosphorylation and rescues neurosphere overproliferation and abnormal dendritic spines caused by Ints6 deficiency, placing INTS6 in the RNAPII transcription elongation control pathway during neurogenesis.","method":"Conditional KO mouse, behavioral assays, CDK9 inhibitor rescue, RNAPII ChIP, neurosphere assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined cellular phenotypes, mechanistic rescue by CDK9 inhibitor, and RNAPII ChIP in a single rigorous study","pmids":["40966122"],"is_preprint":false}],"current_model":"INTS6 is a subunit of the Integrator complex that (1) recruits PP2A to modulate RNAPII phosphorylation and premature transcription termination at select protein-coding genes, (2) forms a tetrameric complex with SOSS1 (via direct INTS3 interaction defined by crystal structure) to bind DNA:RNA hybrids, recruit senataxin, and facilitate R-loop resolution and DSB repair, and (3) regulates neurogenesis and cortical development by controlling RNAPII elongation dynamics, with loss-of-function in mice rescued by CDK9 inhibition."},"narrative":{"teleology":[{"year":1998,"claim":"Initial characterization established that the INTS6 ortholog (DBI-1) is a nuclear protein capable of modulating growth factor signaling, linking it to cell proliferation control before its Integrator complex membership was known.","evidence":"Immunofluorescence and overexpression/proliferation assays in mouse cells with IGF-1 receptor","pmids":["9473344"],"confidence":"Medium","gaps":["Mechanism of IGF-1 response modulation unresolved","No direct binding partner identified","Overexpression-only phenotype without loss-of-function"]},{"year":2004,"claim":"Growth-suppressive activity of INTS6 was confirmed across multiple cancer cell lines, reinforcing its role as an anti-proliferative factor but leaving the molecular mechanism undefined.","evidence":"Colony formation and soft-agar assays with GFP-DICE1 fusion in lung and prostate carcinoma lines","pmids":["15254679"],"confidence":"Medium","gaps":["No pathway epistasis performed","Overexpression artifact not excluded","Endogenous loss-of-function data lacking"]},{"year":2009,"claim":"Re-expression experiments placed INTS6 upstream of Wnt/β-catenin signaling and cell-cycle progression, providing the first pathway-level explanation for its growth-suppressive phenotype.","evidence":"Colony formation, FACS cell-cycle analysis, and expression profiling in prostate cancer cells","pmids":["19906297"],"confidence":"Medium","gaps":["Direct physical link to Wnt pathway components not shown","Expression profiling correlative","No in vivo validation"]},{"year":2013,"claim":"Maternal-effect loss of Ints6 in zebrafish demonstrated an essential in vivo role in vertebrate embryonic patterning through BMP/Nodal signaling balance, extending INTS6 function beyond cancer biology to developmental signaling.","evidence":"Maternal-effect mutation in zebrafish with BMP/Nodal genetic epistasis and in situ hybridization","pmids":["24204286"],"confidence":"High","gaps":["Whether Integrator complex integrity is required for the BMP/Nodal phenotype not tested","Mechanism connecting INTS6 to BMP ligand transcription unknown","Mammalian developmental phenotype not yet examined"]},{"year":2021,"claim":"Structural determination of the INTS3–INTS6 C-terminal interface at atomic resolution defined how INTS6 integrates into the SOSS1 DNA repair complex and showed that this interaction is required for double-strand break repair.","evidence":"X-ray crystallography at 2.4 Å, EMSA, site-directed mutagenesis, and DSB repair functional assays","pmids":["34400606"],"confidence":"High","gaps":["Full-length complex structure not available","How INTS6 switches between Integrator and SOSS1 functions unknown","Contribution of INTS6 to ssDNA recognition versus scaffolding not separated"]},{"year":2023,"claim":"Genetic epistasis in Drosophila resolved INTS6's specific role within the Integrator complex: it recruits PP2A phosphatase activity for premature transcription termination at select protein-coding genes but is dispensable for snRNA processing, establishing functional modularity within Integrator.","evidence":"IntS6 overexpression in Drosophila with RNA-seq, ChIP-seq, and epistasis with PP2A B-subunit","pmids":["37995689"],"confidence":"High","gaps":["Endogenous loss-of-function in Drosophila not shown in this study","Whether PP2A recruitment is direct or via intermediate subunits not resolved","Locus-specificity determinants not identified"]},{"year":2024,"claim":"Biochemical reconstitution of the tetrameric SOSS1 complex showed INTS6 directly binds DNA:RNA hybrids, recruits senataxin for R-loop resolution, and promotes PP2A-mediated RNAPII dephosphorylation at DSBs, unifying its transcription and repair functions through a common phosphatase-recruitment mechanism.","evidence":"Co-IP, in vitro binding assays, proximity ligation, and DSB repair functional assays","pmids":["39445827"],"confidence":"High","gaps":["Structural basis of DNA:RNA hybrid recognition by INTS6 unknown","Whether senataxin recruitment is direct or via R-loop intermediates not determined","Relative contributions of Integrator-associated versus SOSS1-associated INTS6 pools in vivo unclear"]},{"year":2025,"claim":"Conditional knockout in mouse brain established INTS6 as essential for neurogenesis and cortical development via RNAPII elongation control, and CDK9 inhibitor rescue demonstrated that the phenotype arises from unrestrained RNAPII phosphorylation, providing the first mammalian in vivo mechanistic link.","evidence":"Nestin-Cre conditional KO mouse, RNAPII ChIP, CDK9 inhibitor rescue, neurosphere assays, behavioral testing","pmids":["40966122"],"confidence":"High","gaps":["Which specific gene targets are dysregulated to cause cortical defects not fully cataloged","Whether the CDK9/PP2A axis operates identically in non-neural tissues unknown","Human neurodevelopmental disease association from patient mutations not yet reported"]},{"year":null,"claim":"How INTS6 is partitioned between Integrator complex and SOSS1 complex functions, what determines locus-specific engagement, and whether INTS6 loss-of-function causes human Mendelian disease remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of full-length INTS6 in the intact Integrator complex","Regulatory signals governing INTS6 allocation between Integrator and SOSS1 unknown","No human disease-causing mutations reported in the primary literature"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,14]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,14]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,1,13]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,14]}],"complexes":["Integrator complex","SOSS1 complex (tetrameric form with INTS3/INIP/hSSB1)"],"partners":["INTS3","INIP","NABP2","SETX","PPP2CA"],"other_free_text":[]},"mechanistic_narrative":"INTS6 is a subunit of the Integrator complex that functions at the intersection of RNA polymerase II (RNAPII) transcription control, DNA damage repair, and developmental signaling. Within the Integrator complex, INTS6 recruits the PP2A phosphatase module to regulate RNAPII phosphorylation and premature transcription termination at a subset of protein-coding genes; overexpression titrates PP2A subunits and selectively blocks phosphatase-dependent attenuation without affecting snRNA processing [PMID:37995689]. INTS6 also forms a tetrameric complex with the SOSS1 DNA repair machinery (INTS3, INIP, hSSB1) through a structurally defined C-terminal interface with INTS3, enabling recognition of DNA:RNA hybrids, recruitment of senataxin to resolve R-loops at double-strand breaks, and PP2A-mediated RNAPII dephosphorylation at damage sites [PMID:34400606, PMID:39445827]. Conditional knockout of Ints6 in the mouse nervous system disrupts neurogenesis, cortical lamination, and synaptic development through dysregulated RNAPII elongation, and these phenotypes are rescued by CDK9 inhibition, establishing INTS6 as a critical regulator of transcription elongation dynamics during brain development [PMID:40966122]."},"prefetch_data":{"uniprot":{"accession":"Q9UL03","full_name":"Integrator complex subunit 6","aliases":["DBI-1","Protein deleted in cancer 1","DICE1"],"length_aa":887,"mass_kda":100.4,"function":"Component of the integrator complex, a multiprotein complex that terminates RNA polymerase II (Pol II) transcription in the promoter-proximal region of genes (PubMed:33243860, PubMed:34004147, PubMed:39504960). The integrator complex provides a quality checkpoint during transcription elongation by driving premature transcription termination of transcripts that are unfavorably configured for transcriptional elongation: the complex terminates transcription by (1) catalyzing dephosphorylation of the C-terminal domain (CTD) of Pol II subunit POLR2A and SUPT5H/SPT5, (2) degrading the exiting nascent RNA transcript via endonuclease activity and (3) promoting the release of Pol II from bound DNA (PubMed:33243860, PubMed:34004147, PubMed:38570683, PubMed:39504960). The integrator complex is also involved in terminating the synthesis of non-coding Pol II transcripts, such as enhancer RNAs (eRNAs), small nuclear RNAs (snRNAs), telomerase RNAs and long non-coding RNAs (lncRNAs) (PubMed:16239144). Within the integrator complex, INTS6 acts as a molecular adapter that promotes assembly of protein phosphatase 2A (PP2A) subunits to the integrator core complex, promoting recruitment of PP2A to transcription pause-release checkpoint (PubMed:33243860, PubMed:34004147). Mediates recruitment of cytoplasmic dynein to the nuclear envelope, probably as component of the integrator complex (PubMed:23904267). May have a tumor suppressor role; an ectopic expression suppressing tumor cell growth (PubMed:15254679, PubMed:16239144)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q9UL03/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/INTS6","classification":"Common Essential","n_dependent_lines":933,"n_total_lines":1208,"dependency_fraction":0.7723509933774835},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"POLR2B","stoichiometry":0.2},{"gene":"POLR2E","stoichiometry":0.2},{"gene":"POLR2F","stoichiometry":0.2},{"gene":"POLR2K","stoichiometry":0.2},{"gene":"PPP2CA","stoichiometry":0.2},{"gene":"SEM1","stoichiometry":0.2},{"gene":"SSRP1","stoichiometry":0.2},{"gene":"SUPT5H","stoichiometry":0.2},{"gene":"TOP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/INTS6","total_profiled":1310},"omim":[{"mim_id":"604331","title":"INTEGRATOR COMPLEX SUBUNIT 6; INTS6","url":"https://www.omim.org/entry/604331"},{"mim_id":"600592","title":"MINICHROMOSOME MAINTENANCE COMPLEX COMPONENT 7; MCM7","url":"https://www.omim.org/entry/600592"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Actin filaments","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/INTS6"},"hgnc":{"alias_symbol":["DICE1","HDB","Notchl2","DBI-1","DDX26A","INT6"],"prev_symbol":["DDX26"]},"alphafold":{"accession":"Q9UL03","domains":[{"cath_id":"3.40.50.410","chopping":"2-179_188-228","consensus_level":"high","plddt":90.3695,"start":2,"end":228},{"cath_id":"-","chopping":"234-243_259-440","consensus_level":"high","plddt":91.7326,"start":234,"end":440},{"cath_id":"-","chopping":"815-881","consensus_level":"high","plddt":86.97,"start":815,"end":881}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UL03","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UL03-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UL03-F1-predicted_aligned_error_v6.png","plddt_mean":72.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=INTS6","jax_strain_url":"https://www.jax.org/strain/search?query=INTS6"},"sequence":{"accession":"Q9UL03","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UL03.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UL03/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UL03"}},"corpus_meta":[{"pmid":"23280823","id":"PMC_23280823","title":"Targeting of DICE1 tumor suppressor by Epstein-Barr virus-encoded miR-BART3* microRNA in nasopharyngeal carcinoma.","date":"2013","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/23280823","citation_count":91,"is_preprint":false},{"pmid":"25686840","id":"PMC_25686840","title":"Pseudogene INTS6P1 regulates its cognate gene INTS6 through competitive binding of miR-17-5p in hepatocellular carcinoma.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/25686840","citation_count":58,"is_preprint":false},{"pmid":"10467397","id":"PMC_10467397","title":"Isolation of DICE1: a gene frequently affected by LOH and downregulated in lung carcinomas.","date":"1999","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/10467397","citation_count":56,"is_preprint":false},{"pmid":"24204286","id":"PMC_24204286","title":"The integrator complex subunit 6 (Ints6) confines the dorsal organizer in vertebrate embryogenesis.","date":"2013","source":"PLoS 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controls","date":"2025-01-24","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.21.634106","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13037,"output_tokens":3506,"usd":0.045851},"stage2":{"model":"claude-opus-4-6","input_tokens":6927,"output_tokens":2335,"usd":0.139515},"total_usd":0.185366,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structure of the INTS3 C-terminus in complex with the INTS6 C-terminus (at 2.4 Å resolution) revealed that two INTS3c subunits dimerize and interact with INTS6c via conserved residues; INTS3 dimerization is required for recognizing longer ssDNA, and disruption of the INTS3c/INTS6c interaction impairs DSB repair.\",\n      \"method\": \"X-ray crystallography, biochemical assays (EMSA, mutagenesis), DSB repair functional assays\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis and functional DSB repair assays in a single study\",\n      \"pmids\": [\"34400606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"INTS6 associates with the heterotrimeric SOSS1 complex (INTS3, INIP, hSSB1) to form a tetrameric SOSS1 complex; INTS6 binds DNA:RNA hybrids, promotes PP2A recruitment to DSBs facilitating RNAPII dephosphorylation, prevents accumulation of damage-associated RNA transcripts, and recruits senataxin (SETX) to DSBs to resolve R-loops.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding/biochemical assays, proximity ligation, functional DSB repair assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, biochemical binding, functional rescue) in a single study\",\n      \"pmids\": [\"39445827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"IntS6 (Drosophila ortholog of INTS6) over-expression blocks Integrator function at a subset of protein-coding genes by titrating PP2A subunits, thereby inhibiting Integrator phosphatase module activity only at loci where phosphatase activity is required for premature transcription termination; it has no effect on snRNA processing or attenuation at other loci.\",\n      \"method\": \"Genetic over-expression in Drosophila, RNA-seq, ChIP-seq, epistasis with canonical PP2A B-subunit over-expression\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis plus transcriptomic and ChIP readouts, replicated with PP2A B-subunit controls\",\n      \"pmids\": [\"37995689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DICE1 (INTS6) encodes a protein containing a DEAD-box helicase motif and other helicase superfamily II motifs; GFP-fusion protein localizes preferentially to the nucleus, suggesting involvement in nuclear RNA processes.\",\n      \"method\": \"GFP fusion protein live-cell imaging, genomic/cDNA sequence analysis\",\n      \"journal\": \"Oncology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization experiment (GFP imaging) without functional epistasis\",\n      \"pmids\": [\"11939413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"DBI-1 (mouse ortholog of INTS6/DICE1) protein localizes to the nucleus and, when overexpressed, diminishes the mitogenic response to IGF-1 in cells expressing the wild-type IGF-1 receptor.\",\n      \"method\": \"Immunofluorescence, overexpression, proliferation assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization and functional overexpression phenotype in a single lab\",\n      \"pmids\": [\"9473344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Ectopic expression of DICE1 (INTS6) via GFP-fusion constructs inhibits colony formation in lung carcinoma and prostate carcinoma cell lines, and suppresses anchorage-independent growth of IGF-IR-transformed cells dependent on IGF-I signaling.\",\n      \"method\": \"Colony formation assay, soft-agar growth assay, GFP-fusion overexpression\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional overexpression with defined cellular phenotype (growth suppression) but limited mechanistic pathway detail\",\n      \"pmids\": [\"15254679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Re-expression of INTS6 in androgen-independent prostate cancer cells suppresses colony formation and causes G1 cell-cycle arrest; expression profiling revealed up-regulation of Wnt inhibitor CXXC4, FZD7, TCF7L1, and down-regulation of cyclin D1, linking INTS6 function to Wnt signaling and cell-cycle regulation.\",\n      \"method\": \"Colony formation assay, cell cycle analysis (FACS), gene expression profiling\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — overexpression with defined phenotype plus expression profiling placing INTS6 in Wnt/cell-cycle pathway\",\n      \"pmids\": [\"19906297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of Ints6 (zebrafish ortholog) from maternal stores causes widespread de-repression of dorsal organizer genes, failure to maintain BMP ligand expression and vox/ved expression, delayed gastrulation cell movements, and severe dorsalization; restoring BMP signaling or limiting Nodal signaling rescues wild-type patterning, placing Ints6 upstream of BMP/Nodal balance in vertebrate embryonic dorsoventral patterning.\",\n      \"method\": \"Maternal-effect recessive mutation analysis in zebrafish, genetic epistasis (BMP/Nodal modulation rescue), in situ hybridization\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function (maternal-effect mutation) with genetic epistasis and defined developmental phenotype\",\n      \"pmids\": [\"24204286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RNAi of the C. elegans INTS6 ortholog DIC-1 causes embryonic lethality with increased apoptosis and abnormal morphogenesis; DIC-1 localizes to the inner mitochondrial membrane, and its loss results in abnormal mitochondrial cristae morphology and internal vesicles, demonstrating a role in maintaining inner mitochondrial membrane topology.\",\n      \"method\": \"RNAi, cryoelectron microscopy, immunofluorescence, genetic interaction with ced-3\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNAi loss-of-function with ultrastructural (cryo-EM) localization evidence; C. elegans ortholog may have divergent mitochondrial function vs. mammalian INTS6\",\n      \"pmids\": [\"16914495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EBV-encoded miR-BART3* directly targets the 3'-UTR of DICE1 (INTS6) mRNA, causing down-regulation of DICE1 protein; inhibiting endogenous miR-BART3* with anti-miR oligonucleotides restored DICE1 expression, and forced miR-BART3* expression overcame DICE1 growth suppression and stimulated cell proliferation.\",\n      \"method\": \"3'-UTR reporter assay, anti-miR oligonucleotide inhibition, western blot, proliferation assay\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'-UTR targeting validated by gain- and loss-of-function experiments with functional readout\",\n      \"pmids\": [\"23280823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"INTS6 and its pseudogene INTS6P1 are reciprocally regulated through competition for oncomiR-17-5p (ceRNA mechanism); miR-17-5p targets both, and INTS6P1 acts as a competing endogenous RNA to derepress INTS6 in hepatocellular carcinoma.\",\n      \"method\": \"miRNA target reporter assay, overexpression/knockdown, growth/migration assays, in vivo xenograft\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — ceRNA mechanism supported by reporter assays and functional rescue but single lab\",\n      \"pmids\": [\"25686840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Small activating RNA targeting the INTS6 promoter (dsRNA-915) upregulates INTS6 expression in castration-resistant prostate cancer cells, suppresses proliferation and motility, and downregulates Wnt/β-catenin signaling; impairment of β-catenin degradation reverses these tumor suppressor effects, placing INTS6 function upstream of β-catenin.\",\n      \"method\": \"Small activating RNA transfection, cell proliferation/migration assays, western blot (β-catenin pathway)\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional gain-of-expression with β-catenin rescue epistasis; single lab, limited mechanistic resolution\",\n      \"pmids\": [\"29895194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"INTS6 knockdown in colorectal cancer cells induces G1/S cell-cycle arrest and suppresses tumor growth; overexpression increases phospho-AKT and phospho-ERK levels, and pharmacological AKT or ERK inhibitors block the growth-promoting effect, placing INTS6 upstream of PI3K/AKT and MAPK pathways regulating c-Myc and CDK2.\",\n      \"method\": \"siRNA knockdown, overexpression, western blot (p-AKT, p-ERK), kinase inhibitor rescue, xenograft assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — bidirectional manipulation with pathway inhibitor epistasis; single lab\",\n      \"pmids\": [\"34508742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In C. elegans, INTS-6 is required for RAD-51 foci formation upon X-ray irradiation and for CDK-1 Tyr-15 phosphorylation, placing the Integrator subunit 6 in the DNA damage response pathway upstream of CDK-1 regulation.\",\n      \"method\": \"RNAi/loss-of-function in C. elegans, immunofluorescence (RAD-51 foci), western blot (CDK-1 pTyr15)\",\n      \"journal\": \"microPublication biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct loss-of-function with two orthogonal molecular readouts in a C. elegans ortholog\",\n      \"pmids\": [\"39575199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Conditional knockout of Ints6 in mouse nervous system disrupts early neurogenesis, cortical lamination, and synaptic development, with increased apoptosis in cortical layer 6 and altered RNAPII dynamics; CDK9 inhibitor treatment reduces RNAPII phosphorylation and rescues neurosphere overproliferation and abnormal dendritic spines caused by Ints6 deficiency, placing INTS6 in the RNAPII transcription elongation control pathway during neurogenesis.\",\n      \"method\": \"Conditional KO mouse, behavioral assays, CDK9 inhibitor rescue, RNAPII ChIP, neurosphere assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular phenotypes, mechanistic rescue by CDK9 inhibitor, and RNAPII ChIP in a single rigorous study\",\n      \"pmids\": [\"40966122\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"INTS6 is a subunit of the Integrator complex that (1) recruits PP2A to modulate RNAPII phosphorylation and premature transcription termination at select protein-coding genes, (2) forms a tetrameric complex with SOSS1 (via direct INTS3 interaction defined by crystal structure) to bind DNA:RNA hybrids, recruit senataxin, and facilitate R-loop resolution and DSB repair, and (3) regulates neurogenesis and cortical development by controlling RNAPII elongation dynamics, with loss-of-function in mice rescued by CDK9 inhibition.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"INTS6 is a subunit of the Integrator complex that functions at the intersection of RNA polymerase II (RNAPII) transcription control, DNA damage repair, and developmental signaling. Within the Integrator complex, INTS6 recruits the PP2A phosphatase module to regulate RNAPII phosphorylation and premature transcription termination at a subset of protein-coding genes; overexpression titrates PP2A subunits and selectively blocks phosphatase-dependent attenuation without affecting snRNA processing [PMID:37995689]. INTS6 also forms a tetrameric complex with the SOSS1 DNA repair machinery (INTS3, INIP, hSSB1) through a structurally defined C-terminal interface with INTS3, enabling recognition of DNA:RNA hybrids, recruitment of senataxin to resolve R-loops at double-strand breaks, and PP2A-mediated RNAPII dephosphorylation at damage sites [PMID:34400606, PMID:39445827]. Conditional knockout of Ints6 in the mouse nervous system disrupts neurogenesis, cortical lamination, and synaptic development through dysregulated RNAPII elongation, and these phenotypes are rescued by CDK9 inhibition, establishing INTS6 as a critical regulator of transcription elongation dynamics during brain development [PMID:40966122].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Initial characterization established that the INTS6 ortholog (DBI-1) is a nuclear protein capable of modulating growth factor signaling, linking it to cell proliferation control before its Integrator complex membership was known.\",\n      \"evidence\": \"Immunofluorescence and overexpression/proliferation assays in mouse cells with IGF-1 receptor\",\n      \"pmids\": [\"9473344\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of IGF-1 response modulation unresolved\", \"No direct binding partner identified\", \"Overexpression-only phenotype without loss-of-function\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Growth-suppressive activity of INTS6 was confirmed across multiple cancer cell lines, reinforcing its role as an anti-proliferative factor but leaving the molecular mechanism undefined.\",\n      \"evidence\": \"Colony formation and soft-agar assays with GFP-DICE1 fusion in lung and prostate carcinoma lines\",\n      \"pmids\": [\"15254679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No pathway epistasis performed\", \"Overexpression artifact not excluded\", \"Endogenous loss-of-function data lacking\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Re-expression experiments placed INTS6 upstream of Wnt/β-catenin signaling and cell-cycle progression, providing the first pathway-level explanation for its growth-suppressive phenotype.\",\n      \"evidence\": \"Colony formation, FACS cell-cycle analysis, and expression profiling in prostate cancer cells\",\n      \"pmids\": [\"19906297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical link to Wnt pathway components not shown\", \"Expression profiling correlative\", \"No in vivo validation\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Maternal-effect loss of Ints6 in zebrafish demonstrated an essential in vivo role in vertebrate embryonic patterning through BMP/Nodal signaling balance, extending INTS6 function beyond cancer biology to developmental signaling.\",\n      \"evidence\": \"Maternal-effect mutation in zebrafish with BMP/Nodal genetic epistasis and in situ hybridization\",\n      \"pmids\": [\"24204286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Integrator complex integrity is required for the BMP/Nodal phenotype not tested\", \"Mechanism connecting INTS6 to BMP ligand transcription unknown\", \"Mammalian developmental phenotype not yet examined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Structural determination of the INTS3–INTS6 C-terminal interface at atomic resolution defined how INTS6 integrates into the SOSS1 DNA repair complex and showed that this interaction is required for double-strand break repair.\",\n      \"evidence\": \"X-ray crystallography at 2.4 Å, EMSA, site-directed mutagenesis, and DSB repair functional assays\",\n      \"pmids\": [\"34400606\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length complex structure not available\", \"How INTS6 switches between Integrator and SOSS1 functions unknown\", \"Contribution of INTS6 to ssDNA recognition versus scaffolding not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Genetic epistasis in Drosophila resolved INTS6's specific role within the Integrator complex: it recruits PP2A phosphatase activity for premature transcription termination at select protein-coding genes but is dispensable for snRNA processing, establishing functional modularity within Integrator.\",\n      \"evidence\": \"IntS6 overexpression in Drosophila with RNA-seq, ChIP-seq, and epistasis with PP2A B-subunit\",\n      \"pmids\": [\"37995689\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous loss-of-function in Drosophila not shown in this study\", \"Whether PP2A recruitment is direct or via intermediate subunits not resolved\", \"Locus-specificity determinants not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Biochemical reconstitution of the tetrameric SOSS1 complex showed INTS6 directly binds DNA:RNA hybrids, recruits senataxin for R-loop resolution, and promotes PP2A-mediated RNAPII dephosphorylation at DSBs, unifying its transcription and repair functions through a common phosphatase-recruitment mechanism.\",\n      \"evidence\": \"Co-IP, in vitro binding assays, proximity ligation, and DSB repair functional assays\",\n      \"pmids\": [\"39445827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DNA:RNA hybrid recognition by INTS6 unknown\", \"Whether senataxin recruitment is direct or via R-loop intermediates not determined\", \"Relative contributions of Integrator-associated versus SOSS1-associated INTS6 pools in vivo unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conditional knockout in mouse brain established INTS6 as essential for neurogenesis and cortical development via RNAPII elongation control, and CDK9 inhibitor rescue demonstrated that the phenotype arises from unrestrained RNAPII phosphorylation, providing the first mammalian in vivo mechanistic link.\",\n      \"evidence\": \"Nestin-Cre conditional KO mouse, RNAPII ChIP, CDK9 inhibitor rescue, neurosphere assays, behavioral testing\",\n      \"pmids\": [\"40966122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific gene targets are dysregulated to cause cortical defects not fully cataloged\", \"Whether the CDK9/PP2A axis operates identically in non-neural tissues unknown\", \"Human neurodevelopmental disease association from patient mutations not yet reported\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How INTS6 is partitioned between Integrator complex and SOSS1 complex functions, what determines locus-specific engagement, and whether INTS6 loss-of-function causes human Mendelian disease remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length INTS6 in the intact Integrator complex\", \"Regulatory signals governing INTS6 allocation between Integrator and SOSS1 unknown\", \"No human disease-causing mutations reported in the primary literature\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 14]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 14]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 1, 13]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 14]}\n    ],\n    \"complexes\": [\n      \"Integrator complex\",\n      \"SOSS1 complex (tetrameric form with INTS3/INIP/hSSB1)\"\n    ],\n    \"partners\": [\n      \"INTS3\",\n      \"INIP\",\n      \"NABP2\",\n      \"SETX\",\n      \"PPP2CA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}