{"gene":"INTS8","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":2020,"finding":"Integrator subunit 8 (INTS8) is required for association of the Integrator complex with protein phosphatase 2A (PP2A). Integrator-bound PP2A dephosphorylates the RNA Pol II C-terminal domain and Spt5, preventing the transition to productive elongation. INTS8 is thus critical for transcription repression via this phosphatase recruitment mechanism.","method":"Knockdown of INTS8, co-immunoprecipitation, phosphorylation assays of RNA Pol II CTD and Spt5, transcriptional readout assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional knockdown with defined molecular phenotype (CTD/Spt5 dephosphorylation), replicated across multiple assays in a focused study","pmids":["32966759"],"is_preprint":false},{"year":2024,"finding":"INTS8 acts as a gatekeeper preventing the release of excess RNA Pol II molecules into gene bodies. Combined loss of ARMC5 (CRL3ARMC5 ubiquitin ligase) and INTS8 has detrimental effects on cell growth and results in uncontrolled release of excessive, transcriptionally incompetent RNA Pol II complexes into early elongation, demonstrating that INTS8/Integrator and CRL3ARMC5 act in parallel to control RNA Pol II quantity/quality before elongation.","method":"Genetic double-loss-of-function (ARMC5 and INTS8 depletion), cell growth assays, RNA Pol II ChIP/occupancy analysis, identification of elongation-incompetent complexes","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic epistasis (double KO), multiple orthogonal readouts (growth, ChIP, elongation assays), single lab rigorous study","pmids":["39667934"],"is_preprint":false},{"year":2017,"finding":"Biallelic INTS8 mutations in human patients disrupt Integrator complex stability and lead to increased levels of unprocessed UsnRNA, demonstrating INTS8 is required for 3'-end maturation of UsnRNA. Patient cells also show significant disruptions in gene expression and RNA processing.","method":"Patient-derived cell analysis, northern blot/RT-PCR for unprocessed UsnRNA, protein stability assays, genome editing in P19 cells for retinoic acid-induced neural differentiation assay","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — human loss-of-function mutations with defined molecular phenotype (unprocessed UsnRNA), genome editing validation in cellular model, multiple orthogonal methods","pmids":["28542170"],"is_preprint":false},{"year":2019,"finding":"In Drosophila, loss of intS8 (along with intS5 and intS1) generates ectopic type II neuroblasts from intermediate neural progenitors (INPs), demonstrating a role in preventing INP dedifferentiation. INP-specific knockdown of intS8 confirmed cell-autonomous function. INTS8 genetically interacts with the transcription factor earmuff (erm), and erm expression is lost in intS8 mutant neuroblast lineages, placing INTS8 upstream of erm in suppressing dedifferentiation.","method":"Drosophila loss-of-function genetics, INP-specific RNAi knockdown, cell-type-specific DamID chromatin profiling, genetic epistasis (intS8 × erm double mutants), immunofluorescence","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic loss-of-function approaches, genetic epistasis establishing pathway position, cell-type-specific DamID, replicated across multiple Integrator subunits","pmids":["31018143"],"is_preprint":false},{"year":2023,"finding":"An N-terminally truncated form of INTS8 (INTS8-ΔN), when expressed in cells where endogenous INTS8 is degraded via a dTAG system, induces genome-wide RNA Pol II hyperphosphorylation, establishing that the N-terminal domain of INTS8 is required for the phosphatase activity of the Integrator complex toward RNA Pol II.","method":"dTAG-mediated targeted protein degradation, ectopic expression of INTS8-ΔN truncation mutant, RNA Pol II phosphorylation assays (western blot/ChIP)","journal":"STAR protocols","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean genetic/chemical tool (dTAG), domain deletion mutant with functional phosphorylation readout, but single lab protocol paper with limited mechanistic depth in abstract","pmids":["37831607"],"is_preprint":false},{"year":2019,"finding":"INTS8 knockdown in hepatocellular carcinoma cell lines reduces invasion and migration, decreases mesenchymal markers (N-cadherin, vimentin) and increases epithelial markers (E-cadherin), with corresponding downregulation of SMAD4. Pretreatment with TGF-β1 partially rescues these effects, placing INTS8 upstream of TGF-β/SMAD4 signaling in promoting epithelial-to-mesenchymal transition.","method":"shRNA knockdown, migration/invasion/transwell assays, in vivo lung metastasis assay, western blot and RT-qPCR for EMT markers and SMAD4, TGF-β1 rescue experiment","journal":"Cancer management and research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays (migration, invasion, in vivo metastasis) with ligand rescue experiment establishing pathway position, single lab","pmids":["30881114"],"is_preprint":false},{"year":2024,"finding":"A patient-specific in-frame deletion in INTS8 that prevents its association with the Integrator complex causes a global increase in nascent transcription and precocious expression of neuronal genes in neural progenitor cells, leading to premature differentiation and failure to sustain the progenitor pool during cortical development. Targeted degradation of BRD4 (a pause-release factor) rescues neuronal gene activation and prevents premature progenitor loss, establishing that INTS8/Integrator attenuates RNA Pol II pause-release to control neural progenitor maintenance.","method":"Patient-derived neural progenitor cells, nascent transcription assays (TT-seq or equivalent), BRD4 targeted degradation rescue, genome-edited cell lines, cortical differentiation assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient variant with defined complex-disruption mechanism, nascent transcription readout, pharmacological rescue via BRD4 degradation; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"INTS8 is a subunit of the Integrator complex that functions at RNA Pol II promoter-proximal pausing: it recruits protein phosphatase 2A (PP2A) to dephosphorylate the RNA Pol II CTD and Spt5, thereby repressing pause release and promoting premature transcription termination; its N-terminal domain is required for this phosphatase activity, and loss of INTS8 permits uncontrolled release of excessive or defective RNA Pol II into elongation. In neural development, INTS8 is essential for 3'-end maturation of UsnRNAs, maintenance of Integrator complex stability, and prevention of premature neuronal gene activation, with genetic epistasis placing it upstream of transcription factor earmuff (erm) to suppress intermediate progenitor dedifferentiation in Drosophila, and upstream of TGF-β/SMAD4 signaling in cancer cell invasiveness."},"narrative":{"mechanistic_narrative":"INTS8 is a subunit of the Integrator complex that controls RNA Polymerase II promoter-proximal transcription by gating the transition from pausing into productive elongation [PMID:32966759, PMID:39667934]. It is required for the association of the Integrator complex with protein phosphatase 2A (PP2A), and Integrator-bound PP2A dephosphorylates the RNA Pol II C-terminal domain and Spt5 to prevent the switch to productive elongation [PMID:32966759]; the N-terminal domain of INTS8 is necessary for this phosphatase activity, as an N-terminally truncated INTS8 causes genome-wide RNA Pol II hyperphosphorylation [PMID:37831607]. Functionally, INTS8 acts as a quality-control gatekeeper that restrains the release of excess, transcriptionally incompetent RNA Pol II into early elongation, working in parallel with the CRL3ARMC5 ubiquitin ligase [PMID:39667934]. Beyond pause regulation, INTS8 is required for Integrator complex stability and for 3'-end maturation of UsnRNAs, and biallelic INTS8 mutations in humans disrupt these processes and broadly perturb gene expression and RNA processing [PMID:28542170]. In neural development, INTS8 attenuates RNA Pol II pause-release to suppress precocious neuronal gene activation and sustain the progenitor pool, functioning genetically upstream of the transcription factor earmuff to prevent intermediate neural progenitor dedifferentiation in Drosophila [PMID:31018143]. In hepatocellular carcinoma cells, INTS8 promotes epithelial-to-mesenchymal transition and invasion upstream of TGF-β/SMAD4 signaling [PMID:30881114].","teleology":[{"year":2017,"claim":"Establishing that INTS8 is functionally required within the Integrator complex—the question was whether INTS8 loss has a discrete molecular consequence—showed it is needed for complex stability and UsnRNA 3'-end maturation in humans.","evidence":"Patient-derived cells with biallelic INTS8 mutations, northern/RT-PCR for unprocessed UsnRNA, protein stability assays, and genome editing in a neural differentiation model","pmids":["28542170"],"confidence":"High","gaps":["Did not resolve the molecular mechanism by which INTS8 stabilizes the complex","Connection to RNA Pol II pausing not yet established","Tissue-specific consequences of UsnRNA misprocessing unaddressed"]},{"year":2019,"claim":"Placing INTS8 within a developmental pathway—whether Integrator function has cell-fate consequences—showed it suppresses intermediate neural progenitor dedifferentiation genetically upstream of earmuff.","evidence":"Drosophila loss-of-function genetics, INP-specific RNAi, DamID chromatin profiling, and intS8 × erm genetic epistasis","pmids":["31018143"],"confidence":"High","gaps":["Did not define the transcriptional mechanism linking INTS8 to erm regulation","Whether the role depends on UsnRNA processing or Pol II control not distinguished"]},{"year":2019,"claim":"Testing INTS8 in a disease context—whether it influences cancer cell behavior—showed it promotes EMT and invasion upstream of TGF-β/SMAD4 signaling.","evidence":"shRNA knockdown in HCC lines, migration/invasion/transwell and in vivo metastasis assays, EMT-marker analysis, and TGF-β1 rescue","pmids":["30881114"],"confidence":"Medium","gaps":["Mechanistic link between Integrator/Pol II control and SMAD4 levels not established","Whether the effect is Integrator-dependent or an INTS8 moonlighting function unresolved"]},{"year":2020,"claim":"Defining the biochemical mechanism of Integrator repression—how it terminates paused Pol II—showed INTS8 is required to recruit PP2A, which dephosphorylates the Pol II CTD and Spt5 to block productive elongation.","evidence":"INTS8 knockdown, reciprocal co-immunoprecipitation, CTD/Spt5 phosphorylation assays, and transcriptional readouts","pmids":["32966759"],"confidence":"High","gaps":["Structural basis of the INTS8–PP2A interface not determined","Which INTS8 domain mediates PP2A association not yet mapped"]},{"year":2023,"claim":"Mapping the structural requirement for phosphatase activity—which part of INTS8 is needed—showed the N-terminal domain is essential, as INTS8-ΔN causes genome-wide Pol II hyperphosphorylation.","evidence":"dTAG-mediated degradation of endogenous INTS8 with ectopic INTS8-ΔN expression and RNA Pol II phosphorylation readouts","pmids":["37831607"],"confidence":"Medium","gaps":["Protocol paper with limited mechanistic depth","Does not pinpoint residues or define how the N-terminus enables PP2A activity"]},{"year":2024,"claim":"Resolving INTS8's role in Pol II quantity/quality control—whether it gates excess polymerase—showed it prevents release of transcriptionally incompetent Pol II into gene bodies, acting in parallel with CRL3ARMC5.","evidence":"ARMC5/INTS8 double loss-of-function, cell growth assays, RNA Pol II ChIP/occupancy, and identification of elongation-incompetent complexes","pmids":["39667934"],"confidence":"High","gaps":["How Integrator distinguishes competent from incompetent Pol II not defined","Direct biochemical link between INTS8 and CRL3ARMC5 pathways not established"]},{"year":2024,"claim":"Connecting INTS8 pause-control to neural progenitor maintenance—whether Integrator attenuation of pause-release governs cortical development—showed a complex-disrupting INTS8 variant causes global nascent transcription increase and precocious neuronal gene expression, rescued by BRD4 degradation.","evidence":"Patient-derived neural progenitor cells, nascent transcription assays, BRD4 targeted degradation rescue, and cortical differentiation assays (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Whether premature differentiation arises purely from pause-release defects versus UsnRNA processing not disentangled"]},{"year":null,"claim":"How INTS8 mechanistically links Integrator-mediated Pol II pause control to its developmental and oncogenic phenotypes (earmuff regulation, SMAD4 signaling) remains unresolved.","evidence":"No direct experimental bridge in the available corpus connects the PP2A/pause-release mechanism to the TGF-β/SMAD4 and erm pathway outputs","pmids":[],"confidence":"Medium","gaps":["No structural model of INTS8 within Integrator or of the PP2A interface","Mechanism connecting transcription control to SMAD4 downregulation undefined","Whether developmental phenotypes reflect Pol II pausing, UsnRNA maturation, or both unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,6]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[2]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,6]}],"complexes":["Integrator complex"],"partners":["PP2A","SPT5","RNA POL II"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q75QN2","full_name":"Integrator complex subunit 8","aliases":["Protein kaonashi-1"],"length_aa":995,"mass_kda":113.1,"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:28542170, PubMed:33243860, PubMed:34004147, PubMed:37080207, PubMed:38570683). 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/RPB1 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). 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, INTS8 is required for the recruitment of protein phosphatase 2A (PP2A) to transcription pause-release checkpoint (PubMed:32966759, PubMed:33243860, PubMed:34004147, PubMed:37080207)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q75QN2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/INTS8","classification":"Common Essential","n_dependent_lines":1171,"n_total_lines":1208,"dependency_fraction":0.9693708609271523},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"INTS14","stoichiometry":4.0},{"gene":"POLR2B","stoichiometry":0.2},{"gene":"POLR2E","stoichiometry":0.2},{"gene":"POLR2F","stoichiometry":0.2},{"gene":"POLR2I","stoichiometry":0.2},{"gene":"POLR2J","stoichiometry":0.2},{"gene":"POLR2K","stoichiometry":0.2},{"gene":"PPP2CA","stoichiometry":0.2},{"gene":"SEM1","stoichiometry":0.2},{"gene":"SSRP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/INTS8","total_profiled":1310},"omim":[{"mim_id":"618572","title":"NEURODEVELOPMENTAL DISORDER WITH CEREBELLAR HYPOPLASIA AND SPASTICITY; NEDCHS","url":"https://www.omim.org/entry/618572"},{"mim_id":"611351","title":"INTEGRATOR COMPLEX SUBUNIT 8; INTS8","url":"https://www.omim.org/entry/611351"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/INTS8"},"hgnc":{"alias_symbol":["FLJ20530","INT8","MGC131633"],"prev_symbol":["C8orf52"]},"alphafold":{"accession":"Q75QN2","domains":[{"cath_id":"-","chopping":"26-159_180-244","consensus_level":"high","plddt":86.2626,"start":26,"end":244},{"cath_id":"-","chopping":"326-485","consensus_level":"medium","plddt":85.1531,"start":326,"end":485},{"cath_id":"-","chopping":"505-653","consensus_level":"medium","plddt":88.2674,"start":505,"end":653},{"cath_id":"-","chopping":"657-730_746-830","consensus_level":"medium","plddt":87.4229,"start":657,"end":830},{"cath_id":"-","chopping":"837-995","consensus_level":"medium","plddt":91.3283,"start":837,"end":995}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q75QN2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q75QN2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q75QN2-F1-predicted_aligned_error_v6.png","plddt_mean":84.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=INTS8","jax_strain_url":"https://www.jax.org/strain/search?query=INTS8"},"sequence":{"accession":"Q75QN2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q75QN2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q75QN2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q75QN2"}},"corpus_meta":[{"pmid":"32966759","id":"PMC_32966759","title":"Integrator Recruits Protein Phosphatase 2A to Prevent Pause Release and Facilitate Transcription Termination.","date":"2020","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/32966759","citation_count":143,"is_preprint":false},{"pmid":"16537431","id":"PMC_16537431","title":"A dopamine transporter gene functional variant associated with cocaine abuse in a Brazilian sample.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16537431","citation_count":125,"is_preprint":false},{"pmid":"28542170","id":"PMC_28542170","title":"Human mutations in integrator complex subunits link transcriptome integrity to brain development.","date":"2017","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28542170","citation_count":92,"is_preprint":false},{"pmid":"17579365","id":"PMC_17579365","title":"Relationship between VNTR polymorphisms of the human dopamine transporter gene and expression in post-mortem midbrain tissue.","date":"2007","source":"American journal of medical genetics. 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A G-to-T transversion at the first position of exon 5 causing G154V missense mutation and a 5' splice site mutation of intron 8.","date":"2001","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/11441134","citation_count":10,"is_preprint":false},{"pmid":"24892317","id":"PMC_24892317","title":"Genetic variants associated with addictive behavior in Colombian addicted and non-addicted to heroin or cocaine.","date":"2013","source":"Colombia medica (Cali, Colombia)","url":"https://pubmed.ncbi.nlm.nih.gov/24892317","citation_count":10,"is_preprint":false},{"pmid":"17539957","id":"PMC_17539957","title":"Association study of a functional variant in intron 8 of the dopamine transporter gene and migraine susceptibility.","date":"2007","source":"European journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/17539957","citation_count":9,"is_preprint":false},{"pmid":"20493539","id":"PMC_20493539","title":"Influence of genotype on dopamine transporter availability in human striatum and sleep architecture.","date":"2010","source":"Psychiatry research","url":"https://pubmed.ncbi.nlm.nih.gov/20493539","citation_count":7,"is_preprint":false},{"pmid":"37831607","id":"PMC_37831607","title":"Protocol for rapidly inducing genome-wide RNA Pol II hyperphosphorylation by selectively disrupting INTAC phosphatase activity.","date":"2023","source":"STAR protocols","url":"https://pubmed.ncbi.nlm.nih.gov/37831607","citation_count":5,"is_preprint":false},{"pmid":"35573740","id":"PMC_35573740","title":"Intron-Encoded Domain of Herstatin, An Autoinhibitor of Human Epidermal Growth Factor Receptors, Is Intrinsically Disordered.","date":"2022","source":"Frontiers in molecular biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/35573740","citation_count":4,"is_preprint":false},{"pmid":"33802599","id":"PMC_33802599","title":"Mining Complex Genetic Patterns Conferring Multiple Sclerosis Risk.","date":"2021","source":"International journal of environmental research and public health","url":"https://pubmed.ncbi.nlm.nih.gov/33802599","citation_count":4,"is_preprint":false},{"pmid":"16158289","id":"PMC_16158289","title":"Coordinates, DNA content and heterogeneity of cell nuclei and segments of the Caenorhabditis elegans intestine.","date":"2005","source":"Histochemistry and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/16158289","citation_count":4,"is_preprint":false},{"pmid":"34710826","id":"PMC_34710826","title":"Antisense oligonucleotide repress telomerase activity via manipulating alternative splicing or translation.","date":"2021","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/34710826","citation_count":3,"is_preprint":false},{"pmid":"35905732","id":"PMC_35905732","title":"FEEDNet: a feature enhanced encoder-decoder LSTM network for nuclei instance segmentation for histopathological diagnosis.","date":"2022","source":"Physics in medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/35905732","citation_count":3,"is_preprint":false},{"pmid":"38734154","id":"PMC_38734154","title":"Integrative analysis of miRNA-mRNA expression in the brain during high temperature-induced masculinization of female Nile tilapia (Oreochromis niloticus).","date":"2024","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/38734154","citation_count":2,"is_preprint":false},{"pmid":"11750290","id":"PMC_11750290","title":"A family-based study of hyperinsulinemia and hypertriglyceridemia in heterozygous lipoprotein lipase deficiency.","date":"2002","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11750290","citation_count":2,"is_preprint":false},{"pmid":"42122610","id":"PMC_42122610","title":"Evaluating the Adversarial Robustness and Clinical Safety of Quantized Hierarchical Transformers for Edge-Based Malaria Microscopy.","date":"2026","source":"Sensors (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/42122610","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.11.26.625369","title":"The Integrator complex prevents premature neuronal differentiation through global control of transcription elongation","date":"2024-11-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.26.625369","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16515,"output_tokens":2188,"usd":0.041182,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9219,"output_tokens":3095,"usd":0.061735,"stage2_stop_reason":"end_turn"},"total_usd":0.102917,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"Integrator subunit 8 (INTS8) is required for association of the Integrator complex with protein phosphatase 2A (PP2A). Integrator-bound PP2A dephosphorylates the RNA Pol II C-terminal domain and Spt5, preventing the transition to productive elongation. INTS8 is thus critical for transcription repression via this phosphatase recruitment mechanism.\",\n      \"method\": \"Knockdown of INTS8, co-immunoprecipitation, phosphorylation assays of RNA Pol II CTD and Spt5, transcriptional readout assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional knockdown with defined molecular phenotype (CTD/Spt5 dephosphorylation), replicated across multiple assays in a focused study\",\n      \"pmids\": [\"32966759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"INTS8 acts as a gatekeeper preventing the release of excess RNA Pol II molecules into gene bodies. Combined loss of ARMC5 (CRL3ARMC5 ubiquitin ligase) and INTS8 has detrimental effects on cell growth and results in uncontrolled release of excessive, transcriptionally incompetent RNA Pol II complexes into early elongation, demonstrating that INTS8/Integrator and CRL3ARMC5 act in parallel to control RNA Pol II quantity/quality before elongation.\",\n      \"method\": \"Genetic double-loss-of-function (ARMC5 and INTS8 depletion), cell growth assays, RNA Pol II ChIP/occupancy analysis, identification of elongation-incompetent complexes\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic epistasis (double KO), multiple orthogonal readouts (growth, ChIP, elongation assays), single lab rigorous study\",\n      \"pmids\": [\"39667934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Biallelic INTS8 mutations in human patients disrupt Integrator complex stability and lead to increased levels of unprocessed UsnRNA, demonstrating INTS8 is required for 3'-end maturation of UsnRNA. Patient cells also show significant disruptions in gene expression and RNA processing.\",\n      \"method\": \"Patient-derived cell analysis, northern blot/RT-PCR for unprocessed UsnRNA, protein stability assays, genome editing in P19 cells for retinoic acid-induced neural differentiation assay\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human loss-of-function mutations with defined molecular phenotype (unprocessed UsnRNA), genome editing validation in cellular model, multiple orthogonal methods\",\n      \"pmids\": [\"28542170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In Drosophila, loss of intS8 (along with intS5 and intS1) generates ectopic type II neuroblasts from intermediate neural progenitors (INPs), demonstrating a role in preventing INP dedifferentiation. INP-specific knockdown of intS8 confirmed cell-autonomous function. INTS8 genetically interacts with the transcription factor earmuff (erm), and erm expression is lost in intS8 mutant neuroblast lineages, placing INTS8 upstream of erm in suppressing dedifferentiation.\",\n      \"method\": \"Drosophila loss-of-function genetics, INP-specific RNAi knockdown, cell-type-specific DamID chromatin profiling, genetic epistasis (intS8 × erm double mutants), immunofluorescence\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic loss-of-function approaches, genetic epistasis establishing pathway position, cell-type-specific DamID, replicated across multiple Integrator subunits\",\n      \"pmids\": [\"31018143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"An N-terminally truncated form of INTS8 (INTS8-ΔN), when expressed in cells where endogenous INTS8 is degraded via a dTAG system, induces genome-wide RNA Pol II hyperphosphorylation, establishing that the N-terminal domain of INTS8 is required for the phosphatase activity of the Integrator complex toward RNA Pol II.\",\n      \"method\": \"dTAG-mediated targeted protein degradation, ectopic expression of INTS8-ΔN truncation mutant, RNA Pol II phosphorylation assays (western blot/ChIP)\",\n      \"journal\": \"STAR protocols\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean genetic/chemical tool (dTAG), domain deletion mutant with functional phosphorylation readout, but single lab protocol paper with limited mechanistic depth in abstract\",\n      \"pmids\": [\"37831607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"INTS8 knockdown in hepatocellular carcinoma cell lines reduces invasion and migration, decreases mesenchymal markers (N-cadherin, vimentin) and increases epithelial markers (E-cadherin), with corresponding downregulation of SMAD4. Pretreatment with TGF-β1 partially rescues these effects, placing INTS8 upstream of TGF-β/SMAD4 signaling in promoting epithelial-to-mesenchymal transition.\",\n      \"method\": \"shRNA knockdown, migration/invasion/transwell assays, in vivo lung metastasis assay, western blot and RT-qPCR for EMT markers and SMAD4, TGF-β1 rescue experiment\",\n      \"journal\": \"Cancer management and research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays (migration, invasion, in vivo metastasis) with ligand rescue experiment establishing pathway position, single lab\",\n      \"pmids\": [\"30881114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A patient-specific in-frame deletion in INTS8 that prevents its association with the Integrator complex causes a global increase in nascent transcription and precocious expression of neuronal genes in neural progenitor cells, leading to premature differentiation and failure to sustain the progenitor pool during cortical development. Targeted degradation of BRD4 (a pause-release factor) rescues neuronal gene activation and prevents premature progenitor loss, establishing that INTS8/Integrator attenuates RNA Pol II pause-release to control neural progenitor maintenance.\",\n      \"method\": \"Patient-derived neural progenitor cells, nascent transcription assays (TT-seq or equivalent), BRD4 targeted degradation rescue, genome-edited cell lines, cortical differentiation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient variant with defined complex-disruption mechanism, nascent transcription readout, pharmacological rescue via BRD4 degradation; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"INTS8 is a subunit of the Integrator complex that functions at RNA Pol II promoter-proximal pausing: it recruits protein phosphatase 2A (PP2A) to dephosphorylate the RNA Pol II CTD and Spt5, thereby repressing pause release and promoting premature transcription termination; its N-terminal domain is required for this phosphatase activity, and loss of INTS8 permits uncontrolled release of excessive or defective RNA Pol II into elongation. In neural development, INTS8 is essential for 3'-end maturation of UsnRNAs, maintenance of Integrator complex stability, and prevention of premature neuronal gene activation, with genetic epistasis placing it upstream of transcription factor earmuff (erm) to suppress intermediate progenitor dedifferentiation in Drosophila, and upstream of TGF-β/SMAD4 signaling in cancer cell invasiveness.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"INTS8 is a subunit of the Integrator complex that controls RNA Polymerase II promoter-proximal transcription by gating the transition from pausing into productive elongation [#0, #1]. It is required for the association of the Integrator complex with protein phosphatase 2A (PP2A), and Integrator-bound PP2A dephosphorylates the RNA Pol II C-terminal domain and Spt5 to prevent the switch to productive elongation [#0]; the N-terminal domain of INTS8 is necessary for this phosphatase activity, as an N-terminally truncated INTS8 causes genome-wide RNA Pol II hyperphosphorylation [#4]. Functionally, INTS8 acts as a quality-control gatekeeper that restrains the release of excess, transcriptionally incompetent RNA Pol II into early elongation, working in parallel with the CRL3ARMC5 ubiquitin ligase [#1]. Beyond pause regulation, INTS8 is required for Integrator complex stability and for 3'-end maturation of UsnRNAs, and biallelic INTS8 mutations in humans disrupt these processes and broadly perturb gene expression and RNA processing [#2]. In neural development, INTS8 attenuates RNA Pol II pause-release to suppress precocious neuronal gene activation and sustain the progenitor pool, functioning genetically upstream of the transcription factor earmuff to prevent intermediate neural progenitor dedifferentiation in Drosophila [#3]. In hepatocellular carcinoma cells, INTS8 promotes epithelial-to-mesenchymal transition and invasion upstream of TGF-\\u03b2/SMAD4 signaling [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2017,\n      \"claim\": \"Establishing that INTS8 is functionally required within the Integrator complex—the question was whether INTS8 loss has a discrete molecular consequence—showed it is needed for complex stability and UsnRNA 3'-end maturation in humans.\",\n      \"evidence\": \"Patient-derived cells with biallelic INTS8 mutations, northern/RT-PCR for unprocessed UsnRNA, protein stability assays, and genome editing in a neural differentiation model\",\n      \"pmids\": [\"28542170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not resolve the molecular mechanism by which INTS8 stabilizes the complex\",\n        \"Connection to RNA Pol II pausing not yet established\",\n        \"Tissue-specific consequences of UsnRNA misprocessing unaddressed\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placing INTS8 within a developmental pathway—whether Integrator function has cell-fate consequences—showed it suppresses intermediate neural progenitor dedifferentiation genetically upstream of earmuff.\",\n      \"evidence\": \"Drosophila loss-of-function genetics, INP-specific RNAi, DamID chromatin profiling, and intS8 \\u00d7 erm genetic epistasis\",\n      \"pmids\": [\"31018143\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not define the transcriptional mechanism linking INTS8 to erm regulation\",\n        \"Whether the role depends on UsnRNA processing or Pol II control not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Testing INTS8 in a disease context—whether it influences cancer cell behavior—showed it promotes EMT and invasion upstream of TGF-\\u03b2/SMAD4 signaling.\",\n      \"evidence\": \"shRNA knockdown in HCC lines, migration/invasion/transwell and in vivo metastasis assays, EMT-marker analysis, and TGF-\\u03b21 rescue\",\n      \"pmids\": [\"30881114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanistic link between Integrator/Pol II control and SMAD4 levels not established\",\n        \"Whether the effect is Integrator-dependent or an INTS8 moonlighting function unresolved\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defining the biochemical mechanism of Integrator repression—how it terminates paused Pol II—showed INTS8 is required to recruit PP2A, which dephosphorylates the Pol II CTD and Spt5 to block productive elongation.\",\n      \"evidence\": \"INTS8 knockdown, reciprocal co-immunoprecipitation, CTD/Spt5 phosphorylation assays, and transcriptional readouts\",\n      \"pmids\": [\"32966759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the INTS8\\u2013PP2A interface not determined\",\n        \"Which INTS8 domain mediates PP2A association not yet mapped\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapping the structural requirement for phosphatase activity—which part of INTS8 is needed—showed the N-terminal domain is essential, as INTS8-\\u0394N causes genome-wide Pol II hyperphosphorylation.\",\n      \"evidence\": \"dTAG-mediated degradation of endogenous INTS8 with ectopic INTS8-\\u0394N expression and RNA Pol II phosphorylation readouts\",\n      \"pmids\": [\"37831607\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Protocol paper with limited mechanistic depth\",\n        \"Does not pinpoint residues or define how the N-terminus enables PP2A activity\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolving INTS8's role in Pol II quantity/quality control—whether it gates excess polymerase—showed it prevents release of transcriptionally incompetent Pol II into gene bodies, acting in parallel with CRL3ARMC5.\",\n      \"evidence\": \"ARMC5/INTS8 double loss-of-function, cell growth assays, RNA Pol II ChIP/occupancy, and identification of elongation-incompetent complexes\",\n      \"pmids\": [\"39667934\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How Integrator distinguishes competent from incompetent Pol II not defined\",\n        \"Direct biochemical link between INTS8 and CRL3ARMC5 pathways not established\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connecting INTS8 pause-control to neural progenitor maintenance—whether Integrator attenuation of pause-release governs cortical development—showed a complex-disrupting INTS8 variant causes global nascent transcription increase and precocious neuronal gene expression, rescued by BRD4 degradation.\",\n      \"evidence\": \"Patient-derived neural progenitor cells, nascent transcription assays, BRD4 targeted degradation rescue, and cortical differentiation assays (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint, not yet peer-reviewed\",\n        \"Whether premature differentiation arises purely from pause-release defects versus UsnRNA processing not disentangled\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How INTS8 mechanistically links Integrator-mediated Pol II pause control to its developmental and oncogenic phenotypes (earmuff regulation, SMAD4 signaling) remains unresolved.\",\n      \"evidence\": \"No direct experimental bridge in the available corpus connects the PP2A/pause-release mechanism to the TGF-\\u03b2/SMAD4 and erm pathway outputs\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural model of INTS8 within Integrator or of the PP2A interface\",\n        \"Mechanism connecting transcription control to SMAD4 downregulation undefined\",\n        \"Whether developmental phenotypes reflect Pol II pausing, UsnRNA maturation, or both unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 6]}\n    ],\n    \"complexes\": [\"Integrator complex\"],\n    \"partners\": [\"PP2A\", \"Spt5\", \"RNA Pol II\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}