{"gene":"INTS4","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":2018,"finding":"INTS4 is a specific and conserved interaction partner of INTS9 and INTS11 that does not interact with either subunit individually; INTS4/9/11 form a heterotrimeric complex constituting the Integrator 'cleavage module' responsible for endonucleolytic activity. INTS4 possesses N-terminal HEAT repeats similar to Symplekin and a β-sheet rich C-terminal region, both of which are required to bind INTS9/11.","method":"Co-immunoprecipitation, domain deletion/mutagenesis, functional assays for UsnRNA 3'-end processing, Cajal body integrity, and histone locus body formation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including interaction mapping, domain mutagenesis, and three distinct functional readouts in a single study","pmids":["29471365"],"is_preprint":false},{"year":2012,"finding":"Depletion of INTS4 abrogates 3'-end processing of snRNA, causing accumulation of Cajal body marker coilin in nucleoli, loss of SMN and Sm proteins from Cajal bodies, and formation of striking cytoplasmic SMN/Sm granules, demonstrating that INTS4 is essential for snRNA maturation and Cajal body homeostasis.","method":"siRNA knockdown of INTS4 with immunofluorescence microscopy and functional snRNA processing assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — clean knockdown with specific cellular phenotype and multiple orthogonal readouts (snRNA processing, coilin localization, SMN/Sm localization)","pmids":["22250197"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structure of the INTS4/9/11 ternary complex at 3.5 Å resolution reveals that INTS4, a helical repeat protein, stabilizes the nuclease domains of INTS9 and INTS11 and that all three proteins form a composite electropositive groove suggesting a putative RNA binding path. INTS11 is the catalytic nuclease bound to its catalytically impaired homolog INTS9 via several interdependent interfaces.","method":"Cryo-electron microscopy at 3.5 Å resolution with biochemical subcomplex characterization","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure with biochemical validation of modular architecture","pmids":["33548203"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of the Drosophila INTS4/9/11 cleavage module at 2.74 Å reveals stable association of an inositol hexakisphosphate (IP6) molecule at a highly electropositive pocket at the interface of all three subunits, 55 Å from the INTS11 active site. IP6 binding is confirmed in human ICM. Mutations in the IP6 binding site or disruption of IP6 biosynthesis significantly reduce Integrator function in snRNA 3'-end processing and mRNA transcription attenuation.","method":"Cryo-EM structure determination, site-directed mutagenesis of IP6-binding residues, IP6-binding assays, snRNA processing and transcription attenuation functional assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structure combined with mutagenesis and multiple functional assays, validated in both Drosophila and human","pmids":["36180473"],"is_preprint":false},{"year":2022,"finding":"INTS11 SUMOylation (at Lys381, Lys462, Lys475) is regulated by SUMO isopeptidases USPL1 and SENP6 and modulates INTS11 subcellular localization and Integrator activity. An INTS11 SUMOylation-deficient mutant retains interaction with INTS4 and INTS9 but loses interaction with other Integrator subunits, suggesting INTS11 SUMOylation is required for full complex assembly.","method":"Overexpression of SUMO isopeptidases, site-directed mutagenesis of SUMO attachment sites, co-immunoprecipitation, subcellular localization, snRNA cleavage assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods from single lab; INTS4 interaction with SUMOylation-deficient INTS11 confirmed by Co-IP","pmids":["36454007"],"is_preprint":false},{"year":2024,"finding":"BRAT1 and WDR73 are biogenesis factors for the INTS4/9/11 cleavage module: they keep INTS9-11 inactive by blocking the endonuclease active site and prevent premature INTS4 association during maturation. BRAT1 also facilitates nuclear import of INTS9-11, after which INTS4 joins. Final BRAT1 release requires locking of the mature cleavage module conformation by IP6.","method":"Biochemical reconstitution, co-immunoprecipitation, nuclear import assays, functional snRNA processing assays, structural analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution and multiple orthogonal methods establishing ordered assembly mechanism with functional validation","pmids":["39032489"],"is_preprint":false},{"year":2006,"finding":"INTS4 (KIAA0513 interactor) physically interacts with KIBRA, HAX-1, and INTS4 as identified by yeast two-hybrid screening, placing INTS4 in signaling networks related to neuroplasticity, apoptosis, and cytoskeletal regulation.","method":"Yeast two-hybrid screen, western blot, immunocytochemistry","journal":"Brain research","confidence":"Low","confidence_rationale":"Tier 3 — single yeast two-hybrid interaction without reciprocal validation; INTS4 identified as interactor of KIAA0513","pmids":["17010949"],"is_preprint":false},{"year":2023,"finding":"Computational coevolution analysis (modified Direct Coupling Analysis) combined with molecular dynamics simulations predicts interacting residues and structural details of the INTS4/INTS9/INTS11 heterotrimer, consistent with crystallographic data for the INTS9/INTS11 interface.","method":"Direct Coupling Analysis (DCA), molecular dynamics simulations, comparison with experimental structures","journal":"Computational and structural biotechnology journal","confidence":"Low","confidence_rationale":"Tier 4 — computational prediction validated only against existing structural data, no new wet-lab experiments","pmids":["38074468"],"is_preprint":false},{"year":2025,"finding":"In C. elegans, depletion of INTS-4 (the ortholog of INTS4) at the L1 larval stage using the auxin-inducible degron system causes developmental arrest and shortened lifespan, while depletion after the L2/L3 stage does not impair development or lifespan. Germline-specific INTS-4 degradation causes accumulation of misprocessed snRNA transcripts but does not impair development or lifespan.","method":"Auxin-inducible degron (AID) system for conditional tissue-specific and temporal depletion; developmental phenotyping; snRNA processing assays","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 — clean conditional KO with temporal specificity and molecular (snRNA processing) plus organismal phenotype readouts","pmids":["40071568"],"is_preprint":false}],"current_model":"INTS4 is a HEAT-repeat scaffold protein that, together with INTS9 and INTS11, forms the heterotrimeric Integrator cleavage module (ICM); within this complex INTS4 stabilizes the INTS11 endonuclease and its catalytically impaired paralog INTS9 through N-terminal HEAT repeats and a C-terminal β-sheet domain, facilitates RNA binding via a composite electropositive groove, requires inositol hexakisphosphate (IP6) as an essential co-factor for mature complex conformation, and is essential for snRNA 3'-end processing, Cajal body integrity, and transcription attenuation of protein-coding genes."},"narrative":{"teleology":[{"year":2012,"claim":"Establishing that INTS4 is functionally required for snRNA maturation and Cajal body homeostasis answered whether individual Integrator subunits beyond the catalytic core have non-redundant roles in vivo.","evidence":"siRNA knockdown of INTS4 in human cells with immunofluorescence and snRNA processing assays","pmids":["22250197"],"confidence":"High","gaps":["Mechanism by which INTS4 contributes to snRNA processing was unknown","Whether INTS4 acts within a defined subcomplex or the holo-Integrator was unresolved","Direct versus indirect effects on Cajal body structure were not distinguished"]},{"year":2018,"claim":"Identifying the INTS4/9/11 heterotrimer as a discrete cleavage module resolved how endonucleolytic activity is organized within Integrator and showed that INTS4 functions as the scaffold bridging the INTS9–INTS11 nuclease dimer.","evidence":"Co-immunoprecipitation, domain deletion/mutagenesis, and functional assays for snRNA processing and Cajal body integrity","pmids":["29471365"],"confidence":"High","gaps":["No high-resolution structure of the ternary complex existed","The RNA-binding mode and path were unresolved","How the cleavage module is recruited to the holo-Integrator remained unclear"]},{"year":2021,"claim":"The 3.5 Å cryo-EM structure of the INTS4/9/11 complex revealed how INTS4 stabilizes the INTS9–INTS11 nuclease domains and identified a composite electropositive groove as a putative RNA-binding path, providing the first atomic-level view of the cleavage module architecture.","evidence":"Cryo-EM at 3.5 Å resolution with biochemical subcomplex characterization","pmids":["33548203"],"confidence":"High","gaps":["No RNA-bound structure was available to confirm the binding path","Regulatory cofactors or post-translational modifications were not captured","Mechanism of substrate specificity was unresolved"]},{"year":2022,"claim":"Discovery that IP6 binds the three-subunit interface of the ICM and is required for snRNA processing and transcription attenuation revealed a metabolic cofactor essential for cleavage module function, answering how conformational maturity of the complex is achieved.","evidence":"Cryo-EM at 2.74 Å (Drosophila) with IP6-binding site mutagenesis and functional assays validated in human cells","pmids":["36180473"],"confidence":"High","gaps":["Whether IP6 levels regulate Integrator activity physiologically was not tested","Structural basis of IP6-induced conformational change at atomic detail was not fully resolved","Relationship between IP6 binding and RNA engagement remained unclear"]},{"year":2022,"claim":"Demonstrating that INTS11 SUMOylation is dispensable for INTS4/9/11 trimer formation but required for holo-Integrator assembly clarified the boundary between cleavage module integrity and full complex integration.","evidence":"SUMO isopeptidase overexpression, SUMOylation-site mutagenesis, co-IP, and snRNA cleavage assays","pmids":["36454007"],"confidence":"Medium","gaps":["SUMOylation effects on INTS4 specifically (versus INTS11) were not deconvoluted","In vivo stoichiometry of SUMOylated versus unmodified complexes was not measured","Whether SUMOylation controls ICM activity or only localization/recruitment was unclear"]},{"year":2024,"claim":"Identification of BRAT1 and WDR73 as biogenesis chaperones that enforce ordered ICM assembly — blocking premature INTS4 association and the INTS11 active site until nuclear import and IP6 locking — established that the cleavage module undergoes a regulated maturation pathway rather than spontaneous assembly.","evidence":"Biochemical reconstitution, co-IP, nuclear import assays, snRNA processing assays, and structural analysis","pmids":["39032489"],"confidence":"High","gaps":["Signals triggering BRAT1/WDR73 release beyond IP6 locking were not defined","Whether biogenesis defects contribute to disease phenotypes was not explored","Structural basis of BRAT1 occlusion of the active site at atomic resolution was not reported"]},{"year":2025,"claim":"Conditional depletion of INTS-4 in C. elegans showed that the cleavage module is essential during early larval development but dispensable after the L2/L3 stage, and that germline-specific loss causes snRNA misprocessing without overt developmental defects, revealing temporal and tissue-specific requirements.","evidence":"Auxin-inducible degron system for temporal and tissue-specific depletion with developmental phenotyping and snRNA processing assays","pmids":["40071568"],"confidence":"Medium","gaps":["Which specific developmental programs depend on ICM-mediated transcription attenuation is unknown","Whether mammalian developmental timing requirements mirror the C. elegans findings has not been tested","Compensatory mechanisms after L2/L3 are uncharacterized"]},{"year":null,"claim":"Key open questions include the structural basis for RNA substrate recognition by the ICM, whether IP6 levels serve as a physiological regulator of Integrator activity, and the molecular details of how the cleavage module is recruited to and activated within the holo-Integrator on chromatin.","evidence":"","pmids":[],"confidence":"High","gaps":["No RNA-bound structure of the ICM exists","Mechanism of substrate discrimination between snRNA and mRNA targets is not defined","Structural view of ICM within the complete holo-Integrator is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,5]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,5]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,3,8]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3]}],"complexes":["Integrator cleavage module (INTS4/INTS9/INTS11)"],"partners":["INTS9","INTS11","BRAT1","WDR73"],"other_free_text":[]},"mechanistic_narrative":"INTS4 is a HEAT-repeat scaffold protein that nucleates the heterotrimeric Integrator cleavage module (ICM) together with the endonuclease INTS11 and its catalytically impaired paralog INTS9, and is essential for snRNA 3′-end processing, Cajal body integrity, and transcription attenuation of protein-coding genes. Cryo-EM structures show that INTS4 stabilizes the INTS9/INTS11 nuclease dimer through N-terminal HEAT repeats and a C-terminal β-sheet domain, and that all three subunits create a composite electropositive groove for RNA engagement [PMID:33548203, PMID:29471365]. Inositol hexakisphosphate (IP6) binds a pocket at the three-way interface of INTS4/9/11, locks the mature cleavage module conformation, and is required for both snRNA processing and mRNA transcription attenuation [PMID:36180473]. Biogenesis of the ICM is an ordered process in which chaperones BRAT1 and WDR73 keep the INTS9–INTS11 dimer inactive and prevent premature INTS4 association; INTS4 joins only after nuclear import, and IP6-dependent conformational locking releases BRAT1 to yield the active complex [PMID:39032489]."},"prefetch_data":{"uniprot":{"accession":"Q96HW7","full_name":"Integrator complex subunit 4","aliases":[],"length_aa":963,"mass_kda":108.2,"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:29471365, PubMed:33243860, PubMed:33548203, 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: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, INTS4 acts as an scaffold that links INTS9 and INTS11 (PubMed:29471365, PubMed:33548203). Mediates recruitment of cytoplasmic dynein to the nuclear envelope, probably as component of the integrator complex (PubMed:23904267)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96HW7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/INTS4","classification":"Common Essential","n_dependent_lines":381,"n_total_lines":383,"dependency_fraction":0.9947780678851175},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"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}],"url":"https://opencell.sf.czbiohub.org/search/INTS4","total_profiled":1310},"omim":[{"mim_id":"611675","title":"KIAA0513 GENE; KIAA0513","url":"https://www.omim.org/entry/611675"},{"mim_id":"611348","title":"INTEGRATOR COMPLEX SUBUNIT 4; INTS4","url":"https://www.omim.org/entry/611348"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli rim","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/INTS4"},"hgnc":{"alias_symbol":["INT4","MGC16733","MST093"],"prev_symbol":[]},"alphafold":{"accession":"Q96HW7","domains":[{"cath_id":"1.25.10.10","chopping":"42-182_193-262","consensus_level":"medium","plddt":90.5569,"start":42,"end":262},{"cath_id":"1.25.10.10","chopping":"264-323_371-435","consensus_level":"medium","plddt":89.4332,"start":264,"end":435},{"cath_id":"1.25.10","chopping":"443-588","consensus_level":"medium","plddt":91.8753,"start":443,"end":588},{"cath_id":"-","chopping":"667-804","consensus_level":"high","plddt":84.8228,"start":667,"end":804},{"cath_id":"2.60.40.10","chopping":"820-926_940-958","consensus_level":"high","plddt":84.3349,"start":820,"end":958}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HW7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HW7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HW7-F1-predicted_aligned_error_v6.png","plddt_mean":83.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=INTS4","jax_strain_url":"https://www.jax.org/strain/search?query=INTS4"},"sequence":{"accession":"Q96HW7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96HW7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96HW7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HW7"}},"corpus_meta":[{"pmid":"15141734","id":"PMC_15141734","title":"VDR 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Variant D543N (1730G/A) in the Genetic Susceptibility to Develop Rheumatoid Arthritis in the Mexican Mestizo population.","date":"2017","source":"Revista de investigacion clinica; organo del Hospital de Enfermedades de la Nutricion","url":"https://pubmed.ncbi.nlm.nih.gov/28239176","citation_count":10,"is_preprint":false},{"pmid":"9555046","id":"PMC_9555046","title":"T-->G or T-->A mutation introduced in the branchpoint consensus sequence of intron 4 of lecithin:cholesterol acyltransferase (LCAT) gene: intron retention causing LCAT deficiency.","date":"1998","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/9555046","citation_count":10,"is_preprint":false},{"pmid":"39032489","id":"PMC_39032489","title":"Assembly mechanism of Integrator's RNA cleavage module.","date":"2024","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/39032489","citation_count":9,"is_preprint":false},{"pmid":"26353180","id":"PMC_26353180","title":"The D543N polymorphism of the SLC11A1/NRAMP1 gene is associated with treatment failure in male patients with pulmonary tuberculosis.","date":"2015","source":"Drug metabolism and personalized therapy","url":"https://pubmed.ncbi.nlm.nih.gov/26353180","citation_count":9,"is_preprint":false},{"pmid":"20405176","id":"PMC_20405176","title":"NRAMP1 (SLC11A1) variants: genetic susceptibility to multiple Sclerosis.","date":"2010","source":"Journal of clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/20405176","citation_count":9,"is_preprint":false},{"pmid":"27687579","id":"PMC_27687579","title":"Variants of the elastin (ELN) gene and susceptibility to intracranial aneurysm: a synthesis of genetic association studies using a genetic model-free approach.","date":"2016","source":"The International journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/27687579","citation_count":8,"is_preprint":false},{"pmid":"21169917","id":"PMC_21169917","title":"Polymorphisms of the NRAMP1 gene: distribution and susceptibility to the development of pulmonary tuberculosis in the Greek population.","date":"2011","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/21169917","citation_count":7,"is_preprint":false},{"pmid":"18998137","id":"PMC_18998137","title":"Genetic susceptibility to Behçet's syndrome is associated with NRAMP1 (SLC11A1) polymorphism in Turkish patients.","date":"2008","source":"Rheumatology international","url":"https://pubmed.ncbi.nlm.nih.gov/18998137","citation_count":7,"is_preprint":false},{"pmid":"16981342","id":"PMC_16981342","title":"[Meta-analysis on NRAMP1 gene polymorphisms and tuberculosis susceptibility in East-Asia population].","date":"2006","source":"Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/16981342","citation_count":6,"is_preprint":false},{"pmid":"30345642","id":"PMC_30345642","title":"Association between 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pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/19374813","citation_count":3,"is_preprint":false},{"pmid":"23137204","id":"PMC_23137204","title":"Association of the Nramp1 gene polymorphisms and clinical forms in patients with tuberculosis.","date":"2012","source":"Bratislavske lekarske listy","url":"https://pubmed.ncbi.nlm.nih.gov/23137204","citation_count":3,"is_preprint":false},{"pmid":"37380553","id":"PMC_37380553","title":"Differential NRAMP1gene's D543N genotype frequency: Increased risk of contracting tuberculosis among Venezuelan populations.","date":"2023","source":"Human immunology","url":"https://pubmed.ncbi.nlm.nih.gov/37380553","citation_count":3,"is_preprint":false},{"pmid":"27223255","id":"PMC_27223255","title":"MBL, P2X7, and SLC11A1 gene polymorphisms in patients with oropharyngeal tularemia.","date":"2016","source":"Acta 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A","url":"https://pubmed.ncbi.nlm.nih.gov/40079364","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":37520,"output_tokens":2399,"usd":0.074273},"stage2":{"model":"claude-opus-4-6","input_tokens":5716,"output_tokens":2326,"usd":0.130095},"total_usd":0.204368,"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\": 2018,\n      \"finding\": \"INTS4 is a specific and conserved interaction partner of INTS9 and INTS11 that does not interact with either subunit individually; INTS4/9/11 form a heterotrimeric complex constituting the Integrator 'cleavage module' responsible for endonucleolytic activity. INTS4 possesses N-terminal HEAT repeats similar to Symplekin and a β-sheet rich C-terminal region, both of which are required to bind INTS9/11.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion/mutagenesis, functional assays for UsnRNA 3'-end processing, Cajal body integrity, and histone locus body formation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including interaction mapping, domain mutagenesis, and three distinct functional readouts in a single study\",\n      \"pmids\": [\"29471365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Depletion of INTS4 abrogates 3'-end processing of snRNA, causing accumulation of Cajal body marker coilin in nucleoli, loss of SMN and Sm proteins from Cajal bodies, and formation of striking cytoplasmic SMN/Sm granules, demonstrating that INTS4 is essential for snRNA maturation and Cajal body homeostasis.\",\n      \"method\": \"siRNA knockdown of INTS4 with immunofluorescence microscopy and functional snRNA processing assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean knockdown with specific cellular phenotype and multiple orthogonal readouts (snRNA processing, coilin localization, SMN/Sm localization)\",\n      \"pmids\": [\"22250197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structure of the INTS4/9/11 ternary complex at 3.5 Å resolution reveals that INTS4, a helical repeat protein, stabilizes the nuclease domains of INTS9 and INTS11 and that all three proteins form a composite electropositive groove suggesting a putative RNA binding path. INTS11 is the catalytic nuclease bound to its catalytically impaired homolog INTS9 via several interdependent interfaces.\",\n      \"method\": \"Cryo-electron microscopy at 3.5 Å resolution with biochemical subcomplex characterization\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure with biochemical validation of modular architecture\",\n      \"pmids\": [\"33548203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of the Drosophila INTS4/9/11 cleavage module at 2.74 Å reveals stable association of an inositol hexakisphosphate (IP6) molecule at a highly electropositive pocket at the interface of all three subunits, 55 Å from the INTS11 active site. IP6 binding is confirmed in human ICM. Mutations in the IP6 binding site or disruption of IP6 biosynthesis significantly reduce Integrator function in snRNA 3'-end processing and mRNA transcription attenuation.\",\n      \"method\": \"Cryo-EM structure determination, site-directed mutagenesis of IP6-binding residues, IP6-binding assays, snRNA processing and transcription attenuation functional assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structure combined with mutagenesis and multiple functional assays, validated in both Drosophila and human\",\n      \"pmids\": [\"36180473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"INTS11 SUMOylation (at Lys381, Lys462, Lys475) is regulated by SUMO isopeptidases USPL1 and SENP6 and modulates INTS11 subcellular localization and Integrator activity. An INTS11 SUMOylation-deficient mutant retains interaction with INTS4 and INTS9 but loses interaction with other Integrator subunits, suggesting INTS11 SUMOylation is required for full complex assembly.\",\n      \"method\": \"Overexpression of SUMO isopeptidases, site-directed mutagenesis of SUMO attachment sites, co-immunoprecipitation, subcellular localization, snRNA cleavage assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods from single lab; INTS4 interaction with SUMOylation-deficient INTS11 confirmed by Co-IP\",\n      \"pmids\": [\"36454007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BRAT1 and WDR73 are biogenesis factors for the INTS4/9/11 cleavage module: they keep INTS9-11 inactive by blocking the endonuclease active site and prevent premature INTS4 association during maturation. BRAT1 also facilitates nuclear import of INTS9-11, after which INTS4 joins. Final BRAT1 release requires locking of the mature cleavage module conformation by IP6.\",\n      \"method\": \"Biochemical reconstitution, co-immunoprecipitation, nuclear import assays, functional snRNA processing assays, structural analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution and multiple orthogonal methods establishing ordered assembly mechanism with functional validation\",\n      \"pmids\": [\"39032489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"INTS4 (KIAA0513 interactor) physically interacts with KIBRA, HAX-1, and INTS4 as identified by yeast two-hybrid screening, placing INTS4 in signaling networks related to neuroplasticity, apoptosis, and cytoskeletal regulation.\",\n      \"method\": \"Yeast two-hybrid screen, western blot, immunocytochemistry\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single yeast two-hybrid interaction without reciprocal validation; INTS4 identified as interactor of KIAA0513\",\n      \"pmids\": [\"17010949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Computational coevolution analysis (modified Direct Coupling Analysis) combined with molecular dynamics simulations predicts interacting residues and structural details of the INTS4/INTS9/INTS11 heterotrimer, consistent with crystallographic data for the INTS9/INTS11 interface.\",\n      \"method\": \"Direct Coupling Analysis (DCA), molecular dynamics simulations, comparison with experimental structures\",\n      \"journal\": \"Computational and structural biotechnology journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational prediction validated only against existing structural data, no new wet-lab experiments\",\n      \"pmids\": [\"38074468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In C. elegans, depletion of INTS-4 (the ortholog of INTS4) at the L1 larval stage using the auxin-inducible degron system causes developmental arrest and shortened lifespan, while depletion after the L2/L3 stage does not impair development or lifespan. Germline-specific INTS-4 degradation causes accumulation of misprocessed snRNA transcripts but does not impair development or lifespan.\",\n      \"method\": \"Auxin-inducible degron (AID) system for conditional tissue-specific and temporal depletion; developmental phenotyping; snRNA processing assays\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with temporal specificity and molecular (snRNA processing) plus organismal phenotype readouts\",\n      \"pmids\": [\"40071568\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"INTS4 is a HEAT-repeat scaffold protein that, together with INTS9 and INTS11, forms the heterotrimeric Integrator cleavage module (ICM); within this complex INTS4 stabilizes the INTS11 endonuclease and its catalytically impaired paralog INTS9 through N-terminal HEAT repeats and a C-terminal β-sheet domain, facilitates RNA binding via a composite electropositive groove, requires inositol hexakisphosphate (IP6) as an essential co-factor for mature complex conformation, and is essential for snRNA 3'-end processing, Cajal body integrity, and transcription attenuation of protein-coding genes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"INTS4 is a HEAT-repeat scaffold protein that nucleates the heterotrimeric Integrator cleavage module (ICM) together with the endonuclease INTS11 and its catalytically impaired paralog INTS9, and is essential for snRNA 3′-end processing, Cajal body integrity, and transcription attenuation of protein-coding genes. Cryo-EM structures show that INTS4 stabilizes the INTS9/INTS11 nuclease dimer through N-terminal HEAT repeats and a C-terminal β-sheet domain, and that all three subunits create a composite electropositive groove for RNA engagement [PMID:33548203, PMID:29471365]. Inositol hexakisphosphate (IP6) binds a pocket at the three-way interface of INTS4/9/11, locks the mature cleavage module conformation, and is required for both snRNA processing and mRNA transcription attenuation [PMID:36180473]. Biogenesis of the ICM is an ordered process in which chaperones BRAT1 and WDR73 keep the INTS9–INTS11 dimer inactive and prevent premature INTS4 association; INTS4 joins only after nuclear import, and IP6-dependent conformational locking releases BRAT1 to yield the active complex [PMID:39032489].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Establishing that INTS4 is functionally required for snRNA maturation and Cajal body homeostasis answered whether individual Integrator subunits beyond the catalytic core have non-redundant roles in vivo.\",\n      \"evidence\": \"siRNA knockdown of INTS4 in human cells with immunofluorescence and snRNA processing assays\",\n      \"pmids\": [\"22250197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which INTS4 contributes to snRNA processing was unknown\",\n        \"Whether INTS4 acts within a defined subcomplex or the holo-Integrator was unresolved\",\n        \"Direct versus indirect effects on Cajal body structure were not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying the INTS4/9/11 heterotrimer as a discrete cleavage module resolved how endonucleolytic activity is organized within Integrator and showed that INTS4 functions as the scaffold bridging the INTS9–INTS11 nuclease dimer.\",\n      \"evidence\": \"Co-immunoprecipitation, domain deletion/mutagenesis, and functional assays for snRNA processing and Cajal body integrity\",\n      \"pmids\": [\"29471365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of the ternary complex existed\",\n        \"The RNA-binding mode and path were unresolved\",\n        \"How the cleavage module is recruited to the holo-Integrator remained unclear\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The 3.5 Å cryo-EM structure of the INTS4/9/11 complex revealed how INTS4 stabilizes the INTS9–INTS11 nuclease domains and identified a composite electropositive groove as a putative RNA-binding path, providing the first atomic-level view of the cleavage module architecture.\",\n      \"evidence\": \"Cryo-EM at 3.5 Å resolution with biochemical subcomplex characterization\",\n      \"pmids\": [\"33548203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No RNA-bound structure was available to confirm the binding path\",\n        \"Regulatory cofactors or post-translational modifications were not captured\",\n        \"Mechanism of substrate specificity was unresolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that IP6 binds the three-subunit interface of the ICM and is required for snRNA processing and transcription attenuation revealed a metabolic cofactor essential for cleavage module function, answering how conformational maturity of the complex is achieved.\",\n      \"evidence\": \"Cryo-EM at 2.74 Å (Drosophila) with IP6-binding site mutagenesis and functional assays validated in human cells\",\n      \"pmids\": [\"36180473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether IP6 levels regulate Integrator activity physiologically was not tested\",\n        \"Structural basis of IP6-induced conformational change at atomic detail was not fully resolved\",\n        \"Relationship between IP6 binding and RNA engagement remained unclear\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that INTS11 SUMOylation is dispensable for INTS4/9/11 trimer formation but required for holo-Integrator assembly clarified the boundary between cleavage module integrity and full complex integration.\",\n      \"evidence\": \"SUMO isopeptidase overexpression, SUMOylation-site mutagenesis, co-IP, and snRNA cleavage assays\",\n      \"pmids\": [\"36454007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"SUMOylation effects on INTS4 specifically (versus INTS11) were not deconvoluted\",\n        \"In vivo stoichiometry of SUMOylated versus unmodified complexes was not measured\",\n        \"Whether SUMOylation controls ICM activity or only localization/recruitment was unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of BRAT1 and WDR73 as biogenesis chaperones that enforce ordered ICM assembly — blocking premature INTS4 association and the INTS11 active site until nuclear import and IP6 locking — established that the cleavage module undergoes a regulated maturation pathway rather than spontaneous assembly.\",\n      \"evidence\": \"Biochemical reconstitution, co-IP, nuclear import assays, snRNA processing assays, and structural analysis\",\n      \"pmids\": [\"39032489\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Signals triggering BRAT1/WDR73 release beyond IP6 locking were not defined\",\n        \"Whether biogenesis defects contribute to disease phenotypes was not explored\",\n        \"Structural basis of BRAT1 occlusion of the active site at atomic resolution was not reported\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conditional depletion of INTS-4 in C. elegans showed that the cleavage module is essential during early larval development but dispensable after the L2/L3 stage, and that germline-specific loss causes snRNA misprocessing without overt developmental defects, revealing temporal and tissue-specific requirements.\",\n      \"evidence\": \"Auxin-inducible degron system for temporal and tissue-specific depletion with developmental phenotyping and snRNA processing assays\",\n      \"pmids\": [\"40071568\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Which specific developmental programs depend on ICM-mediated transcription attenuation is unknown\",\n        \"Whether mammalian developmental timing requirements mirror the C. elegans findings has not been tested\",\n        \"Compensatory mechanisms after L2/L3 are uncharacterized\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis for RNA substrate recognition by the ICM, whether IP6 levels serve as a physiological regulator of Integrator activity, and the molecular details of how the cleavage module is recruited to and activated within the holo-Integrator on chromatin.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No RNA-bound structure of the ICM exists\",\n        \"Mechanism of substrate discrimination between snRNA and mRNA targets is not defined\",\n        \"Structural view of ICM within the complete holo-Integrator is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 3, 8]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"Integrator cleavage module (INTS4/INTS9/INTS11)\"\n    ],\n    \"partners\": [\n      \"INTS9\",\n      \"INTS11\",\n      \"BRAT1\",\n      \"WDR73\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}