{"gene":"ASCC1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2002,"finding":"ASCC1 (referred to as P50, the 50 kDa subunit) is a stable component of the endogenous human ASC-1 transcriptional coactivator complex in HeLa nuclei, together with ASC-1 (TRIP4), P200 (ASCC3), and P100 (ASCC2). ASCC1/P50 directly binds to the NF-κB subunit p50 and c-Jun (AP-1), and the ASC-1 complex stimulates transactivation by SRF, AP-1, and NF-κB. Microinjection of an anti-P50 (ASCC1) antibody inhibits AP-1 transactivation, and this inhibition is rescued by wild-type ASCC1 but not by a KH-domain mutant (P50ΔKH) that fails to interact with P200/ASCC3, establishing that the KH domain of ASCC1 mediates its interaction with ASCC3 and is required for ASC-1 complex coactivator function.","method":"Co-immunoprecipitation, single-cell microinjection of blocking antibody, transient transfection reporter assays, yeast two-hybrid, and dominant-negative expression of C. elegans ASC-1","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, antibody microinjection rescue, mutant complementation across multiple orthogonal methods in single study","pmids":["12077347"],"is_preprint":false},{"year":2016,"finding":"Recessive loss-of-function mutations in ASCC1 cause prenatal-onset spinal muscular atrophy with arthrogryposis and congenital bone fractures in humans. Antisense morpholino knockdown of ascc1 in zebrafish disrupts α-motoneuron outgrowth, myotome formation, and neuromuscular junction development, causing a larval swimming defect. Immunoprecipitation of the ASC-1 complex consistently co-purifies CSRP1 (a transcriptional cofactor involved in spinal cord regeneration). ASCC1-mutant patient fibroblasts downregulate genes associated with neurogenesis, neuronal migration/pathfinding (SERPINF1, DAB1, SEMA3D, SEMA3A), and bone development (TNFRSF11B, RASSF2, STC1), placing ASCC1 in a transcriptional coactivator pathway essential for neuromuscular and skeletal development.","method":"Whole-exome sequencing, autozygosity mapping, antisense morpholino knockdown in zebrafish (neuromuscular phenotype readout), co-immunoprecipitation, gene expression profiling of patient fibroblasts","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (human genetics, zebrafish KD with defined phenotype, Co-IP, transcriptomics) in single study with strong functional validation","pmids":["26924529"],"is_preprint":false},{"year":2018,"finding":"ASCC1 contains a putative RNA ligase-like domain (near its C terminus) and functions as a regulatory subunit of the ASCC complex during alkylation DNA damage. ASCC1 physically interacts with the ASCC3 helicase subunit of the complex. Prior to damage, ASCC1 localizes to nuclear speckle foci; upon alkylation damage it leaves these foci. Loss of ASCC1 (CRISPR/Cas9 knockout) causes alkylation damage sensitivity epistatic with ASCC3 loss. ASCC1 knockout dramatically increases ASCC3 foci formation during alkylation damage, yet most of these foci lack ASCC2, demonstrating that ASCC1 is required for proper co-recruitment of ASCC2 with ASCC3 to damage sites — i.e., ASCC1 coordinates correct assembly and recruitment of the ALKBH3–ASCC repair complex.","method":"CRISPR/Cas9 knockout, co-immunoprecipitation, fluorescence microscopy (foci analysis), alkylation sensitivity assays, epistasis analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO with defined damage-sensitivity phenotype, Co-IP, localization imaging, and genetic epistasis, multiple orthogonal methods in single study","pmids":["29997253"],"is_preprint":false},{"year":2018,"finding":"Three additional families with novel homozygous nonsense or frameshift mutations in ASCC1 present with severe prenatal-onset muscle weakness, neonatal hypotonia, arthrogryposis, and congenital bone fractures, expanding the mutation spectrum. Muscle biopsies from affected infants show intense oxidative rims beneath the sarcolemma and remnants of sarcomeres with enlarged Z-bands, potentially representing a histopathological hallmark of ASC-1 complex dysfunction in fetal muscle and bone development.","method":"Whole-exome/Sanger sequencing, muscle biopsy histology and electron microscopy, clinical genetics","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 3 — genetic and histological description without direct functional/biochemical mechanistic experiments; supports disease causality but limited mechanistic depth","pmids":["30327447"],"is_preprint":false}],"current_model":"ASCC1 is a KH-domain-containing subunit of the nuclear ASC-1 transcriptional coactivator complex (with TRIP4/ASC-1, ASCC2/P100, and ASCC3/P200) that directly binds ASCC3 and is required for proper complex assembly and coactivator function in AP-1, NF-κB, and SRF transactivation; during alkylation DNA damage it leaves nuclear speckles and coordinates the recruitment of ASCC2 alongside ASCC3 to damage sites in an epistatic relationship with ASCC3, and loss-of-function mutations in ASCC1 cause a severe prenatal neuromuscular and skeletal syndrome in humans accompanied by downregulation of neurogenesis and bone-development genes."},"narrative":{"teleology":[{"year":2002,"claim":"The first mechanistic question—whether ASCC1 is a bona fide transcriptional coactivator subunit—was resolved by showing it is a stable nuclear component of the ASC-1 complex, directly binds NF-κB p50 and c-Jun, and that its KH-domain-mediated interaction with ASCC3 is essential for AP-1 coactivation.","evidence":"Co-immunoprecipitation, yeast two-hybrid, antibody microinjection with rescue, and reporter assays in HeLa cells","pmids":["12077347"],"confidence":"High","gaps":["No structural detail of the KH-domain–ASCC3 interface","Mechanism by which ASCC1 stimulates transactivation beyond complex integrity unknown","Physiological roles beyond reporter-based transactivation not addressed"]},{"year":2016,"claim":"The question of ASCC1's in vivo relevance was answered by demonstrating that biallelic loss-of-function mutations cause prenatal spinal muscular atrophy with bone fractures in humans, and ascc1 knockdown in zebrafish disrupts motoneuron outgrowth and neuromuscular junction formation, linking ASC-1 complex coactivation to neuromuscular and skeletal development.","evidence":"Whole-exome sequencing, autozygosity mapping, zebrafish morpholino knockdown with phenotypic readout, co-immunoprecipitation (recovering CSRP1), and transcriptomic profiling of patient fibroblasts","pmids":["26924529"],"confidence":"High","gaps":["Direct transcriptional targets of the ASC-1 complex in developing neurons and bone are inferred from expression profiling, not demonstrated by ChIP or functional rescue","Whether disease pathology is due solely to transcriptional coactivation defects or also to DNA repair impairment is unresolved"]},{"year":2018,"claim":"A dual function for ASCC1 was established: beyond transcription, ASCC1 coordinates the alkylation DNA damage response by controlling the co-recruitment of ASCC2 alongside ASCC3 to damage sites, with ASCC1 loss producing damage sensitivity epistatic with ASCC3 loss.","evidence":"CRISPR/Cas9 knockout in human cells, co-immunoprecipitation, fluorescence microscopy foci analysis, and alkylation sensitivity/epistasis assays","pmids":["29997253"],"confidence":"High","gaps":["The catalytic significance of the putative RNA ligase-like domain has not been biochemically tested","Whether ASCC1 contacts damaged DNA/RNA directly or acts solely via protein–protein scaffolding is unknown","Relationship between speckle localization and damage-response activation is mechanistically unexplained"]},{"year":2018,"claim":"Expansion of the ASCC1 mutation spectrum with additional loss-of-function alleles and identification of distinctive muscle histopathology (oxidative rims, Z-band enlargement) reinforced ASCC1 as the causative gene and suggested a histological hallmark of ASC-1 complex dysfunction.","evidence":"Whole-exome/Sanger sequencing, muscle biopsy histology and electron microscopy in three additional families","pmids":["30327447"],"confidence":"Medium","gaps":["Histopathological observations lack functional or biochemical mechanistic explanation","No rescue or modeling experiments performed in this study","Whether muscle-specific pathology reflects transcriptional or DNA repair deficits is unknown"]},{"year":null,"claim":"It remains unresolved whether ASCC1's disease-associated phenotypes arise primarily from impaired transcriptional coactivation, defective alkylation damage repair, or both; the enzymatic activity of the putative RNA ligase-like domain and the structural basis of ASCC1's scaffolding function are also undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No biochemical reconstitution of the RNA ligase-like domain activity","No structure of ASCC1 or the ASCC1–ASCC3 interface","Relative contribution of transcription versus DNA repair functions to human disease not dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[2]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1]}],"complexes":["ASC-1 complex (TRIP4–ASCC1–ASCC2–ASCC3)"],"partners":["ASCC3","TRIP4","ASCC2","CSRP1"],"other_free_text":[]},"mechanistic_narrative":"ASCC1 is a KH-domain-containing subunit of the nuclear ASC-1 transcriptional coactivator complex (with TRIP4, ASCC2, and ASCC3) that directly binds ASCC3 via its KH domain, and this interaction is required for coactivator-dependent transactivation by AP-1, NF-κB, and SRF [PMID:12077347]. Beyond transcription, ASCC1 localizes to nuclear speckles and functions as a regulatory subunit during alkylation DNA damage repair: it departs speckle foci upon damage and is required for the coordinated co-recruitment of ASCC2 with ASCC3 to damage sites, with ASCC1 loss causing alkylation sensitivity epistatic with ASCC3 [PMID:29997253]. Recessive loss-of-function mutations in ASCC1 cause a severe prenatal-onset syndrome of spinal muscular atrophy with arthrogryposis and congenital bone fractures, accompanied by downregulation of neurogenesis and bone-development genes in patient fibroblasts, and disrupted motoneuron and neuromuscular junction development in zebrafish [PMID:26924529]."},"prefetch_data":{"uniprot":{"accession":"Q8N9N2","full_name":"Activating signal cointegrator 1 complex subunit 1","aliases":["ASC-1 complex subunit p50","Trip4 complex subunit p50"],"length_aa":400,"mass_kda":45.5,"function":"Plays a role in DNA damage repair as component of the ASCC complex (PubMed:29997253). Part of the ASC-1 complex that enhances NF-kappa-B, SRF and AP1 transactivation (PubMed:12077347). In cells responding to gastrin-activated paracrine signals, it is involved in the induction of SERPINB2 expression by gastrin. May also play a role in the development of neuromuscular junction","subcellular_location":"Nucleus; Nucleus speckle","url":"https://www.uniprot.org/uniprotkb/Q8N9N2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ASCC1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EIF3B","stoichiometry":0.2},{"gene":"EIF4A1","stoichiometry":0.2},{"gene":"GSPT1","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2},{"gene":"RACK1","stoichiometry":0.2},{"gene":"RPS16","stoichiometry":0.2},{"gene":"SRP9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ASCC1","total_profiled":1310},"omim":[{"mim_id":"616867","title":"SPINAL MUSCULAR ATROPHY WITH CONGENITAL BONE FRACTURES 2; SMABF2","url":"https://www.omim.org/entry/616867"},{"mim_id":"616866","title":"SPINAL MUSCULAR ATROPHY WITH CONGENITAL BONE FRACTURES 1; SMABF1","url":"https://www.omim.org/entry/616866"},{"mim_id":"614266","title":"BARRETT ESOPHAGUS","url":"https://www.omim.org/entry/614266"},{"mim_id":"614217","title":"ACTIVATING SIGNAL COINTEGRATOR 1 COMPLEX, SUBUNIT 3; ASCC3","url":"https://www.omim.org/entry/614217"},{"mim_id":"614216","title":"ACTIVATING SIGNAL COINTEGRATOR 1 COMPLEX, SUBUNIT 2; ASCC2","url":"https://www.omim.org/entry/614216"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ASCC1"},"hgnc":{"alias_symbol":["CGI-18","ASC1p50","Em:AC022392.3","p50"],"prev_symbol":[]},"alphafold":{"accession":"Q8N9N2","domains":[{"cath_id":"3.30.1370.10","chopping":"44-70_89-160","consensus_level":"medium","plddt":69.9466,"start":44,"end":160},{"cath_id":"3.90.1140.10","chopping":"164-316_324-366","consensus_level":"high","plddt":79.894,"start":164,"end":366}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N9N2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N9N2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N9N2-F1-predicted_aligned_error_v6.png","plddt_mean":65.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ASCC1","jax_strain_url":"https://www.jax.org/strain/search?query=ASCC1"},"sequence":{"accession":"Q8N9N2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N9N2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N9N2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N9N2"}},"corpus_meta":[{"pmid":"2203532","id":"PMC_2203532","title":"Cloning 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genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16385451","citation_count":137,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31753913","id":"PMC_31753913","title":"Systematic bromodomain protein screens identify homologous recombination and R-loop suppression pathways involved in genome integrity.","date":"2019","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/31753913","citation_count":110,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33658012","id":"PMC_33658012","title":"FBW7 suppresses ovarian cancer development by targeting the N6-methyladenosine binding protein YTHDF2.","date":"2021","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/33658012","citation_count":106,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12077347","id":"PMC_12077347","title":"Novel transcription coactivator complex containing activating signal cointegrator 1.","date":"2002","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/12077347","citation_count":102,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29229926","id":"PMC_29229926","title":"Cell cycle-dependent phosphorylation regulates RECQL4 pathway choice and ubiquitination in DNA double-strand break repair.","date":"2017","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29229926","citation_count":89,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32099016","id":"PMC_32099016","title":"Identification of a novel trigger complex that facilitates ribosome-associated quality control in mammalian cells.","date":"2020","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/32099016","citation_count":83,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33957083","id":"PMC_33957083","title":"Comprehensive interactome profiling of the human Hsp70 network highlights functional differentiation of J domains.","date":"2021","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/33957083","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26924529","id":"PMC_26924529","title":"Mutations in Subunits of the Activating Signal Cointegrator 1 Complex Are Associated with Prenatal Spinal Muscular Atrophy and Congenital Bone Fractures.","date":"2016","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26924529","citation_count":61,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"27684187","id":"PMC_27684187","title":"Genetic and Proteomic Interrogation of Lower Confidence Candidate Genes Reveals Signaling Networks in β-Catenin-Active Cancers.","date":"2016","source":"Cell systems","url":"https://pubmed.ncbi.nlm.nih.gov/27684187","citation_count":55,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49622,"output_tokens":1092,"usd":0.082623},"stage2":{"model":"claude-opus-4-6","input_tokens":3959,"output_tokens":1131,"usd":0.072105},"total_usd":0.37221,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":62393,"output_tokens":2493,"usd":0.112287},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5126,"output_tokens":1780,"usd":0.105195}},"stage1_raw":"Looking at the corpus, I need to identify which papers are actually about ASCC1 (Activating Signal Cointegrator 1 Complex Subunit 1) versus other genes that happen to use \"p50\" as a symbol (NF-κB p50/NFKB1, Hsp90 cochaperone p50/CDC37, YB-1/p50 mRNA binding protein, hemoglobin P50, etc.).\n\nThe genuine ASCC1 papers in this corpus are:\n- PMID:30327447 (Böhm et al., 2018) - Novel ASCC1 mutations, clinical/histological description\n- PMID:29997253 (Soll et al., 2018) - RNA ligase-like domain in ASCC1 regulates ASCC complex function during alkylation damage\n- PMID:21791690 (Orloff et al., 2011) - Germline mutations in ASCC1 associated with Barrett esophagus/EAC\n\nOnly PMID:29997253 contains direct mechanistic findings about ASCC1. PMID:30327447 provides clinical/histological description (limited mechanism). PMID:21791690 is primarily genetic association.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"ASCC1 interacts with the ASCC complex through the ASCC3 helicase subunit, and ASCC1 localizes to nuclear speckle foci under basal conditions but leaves these foci upon alkylation damage. Loss of ASCC1 increases ASCC3 foci formation during alkylation damage, but most foci lack ASCC2, indicating ASCC1 coordinates proper recruitment/assembly of the ASCC complex. ASCC1 knockout causes alkylation damage sensitivity epistatic with ASCC3, placing ASCC1 in the ALKBH3-ASCC alkylation repair pathway. A putative RNA-binding motif near the ASCC1 C terminus is required for this regulatory function.\",\n      \"method\": \"Co-immunoprecipitation (ASCC1-ASCC3 interaction), live-cell imaging of nuclear speckle foci, CRISPR/Cas9 knockout with alkylation sensitivity assay, epistasis analysis with ASCC3, domain mutagenesis of RNA-binding motif\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction mapping, direct localization with functional consequence, genetic epistasis, domain mutagenesis, and KO phenotype across multiple orthogonal methods in a single study\",\n      \"pmids\": [\"29997253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Recessive loss-of-function mutations in ASCC1 (nonsense or frameshift) cause severe prenatal-onset muscle weakness, neonatal hypotonia, arthrogryposis, and congenital bone fractures, with a distinctive muscle histopathology (intense oxidative rims beneath the sarcolemma, scattered sarcomere remnants with enlarged Z-bands), establishing a physiological role for ASCC1 and the ASC-1 complex in fetal muscle and bone development.\",\n      \"method\": \"Clinical and histological characterization of patients with ASCC1 mutations, sequencing of three additional families with recessive nonsense/frameshift ASCC1 mutations, muscle biopsy analysis\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic loss-of-function with defined cellular/tissue phenotype, but no molecular mechanism established beyond complex membership\",\n      \"pmids\": [\"30327447\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASCC1 is an accessory subunit of the ASC-1 (ASCC) complex that physically interacts with the ASCC3 helicase, localizes to nuclear speckles under basal conditions, and coordinates proper assembly and recruitment of the ASCC complex (including ASCC2) to sites of alkylation DNA damage via a C-terminal RNA-binding motif, functioning epistatically with ASCC3 in the ALKBH3-ASCC alkylation repair pathway; germline loss-of-function mutations in ASCC1 cause a severe congenital disorder affecting fetal muscle and bone development.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification:**\n\nThe vast majority of the retrieved papers (100 papers) are about NF-κB p50 (NFKB1), hemoglobin O2 affinity (P50), P50 sensory gating in schizophrenia, Hsp90 cochaperone p50/CDC37, YB-1/p50 mRNP protein, dynamitin p50 dynactin subunit, or NK cell receptor p50 — all EXCLUDE (alias collisions or unrelated proteins).\n\n**KEEP papers** (about canonical ASCC1 protein):\n\nFrom retrieved papers:\n- PMID 21791690 [32]: Germline mutations in ASCC1 in Barrett esophagus/EAC — mentions ASCC1 mutations but no mechanistic findings about ASCC1 protein function. KEEP but no mechanistic content.\n- PMID 30327447 [85]: Novel ASCC1 mutations — clinical/histological, mentions ASC-1 complex. Limited mechanism.\n- PMID 29997253 [88]: RNA ligase-like domain in ASCC1 regulates ASCC complex during alkylation damage. KEEP — strong mechanistic content.\n\nFrom curated papers:\n- PMID 25219498 [18]: UFM1 modification of ASC1 (TRIP4/ASC-1 complex subunit) — this is about ASC-1/TRIP4, not ASCC1 specifically. EXCLUDE (different subunit).\n- PMID 10567404 [19]: ASC-2 nuclear factor — this is NCOA6/ASC-2, not ASCC1. EXCLUDE.\n- PMID 12077347 [25]: Novel transcription coactivator complex containing ASC-1. P50 here is ASCC1 (the 50 kDa subunit of the ASC-1 complex). KEEP — strong mechanistic content.\n- PMID 26924529 [29]: Mutations in ASCC1 and TRIP4 — prenatal SMA and bone fractures. KEEP — mechanistic content including zebrafish KD, co-IP, gene expression.\n- PMID 30327447 [85]: Novel ASCC1 mutations. KEEP — clinical but confirms ASC-1 complex role.\n- PMID 32099016 [27]: hRQT complex with ASCC3, ASCC2, TRIP4 — ASCC1 not directly studied here. EXCLUDE (ASCC1 not the focus).\n- PMID 29395067 [10]: BioID of mRNA granules — ASCC1 may appear in proximity data. Minimal mechanistic content specific to ASCC1. EXCLUDE.\n- PMID 26186194 [2], 28514442 [3], 26496610 [4], 25416956 [5], 32296183 [6], 33961781 [8]: Interactome maps — ASCC1 appears as a node. No specific mechanistic findings extracted. EXCLUDE from discoveries.\n- PMID 33060197 [11]: Coronavirus interactions — ASCC1 may appear. No specific ASCC1 mechanism. EXCLUDE.\n- PMID 26673895 [17]: CRM1 nuclear export — ASCC1 may appear in dataset. No specific ASCC1 mechanism. EXCLUDE.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"ASCC1 (referred to as P50, the 50 kDa subunit) is a stable component of the endogenous human ASC-1 transcriptional coactivator complex in HeLa nuclei, together with ASC-1 (TRIP4), P200 (ASCC3), and P100 (ASCC2). ASCC1/P50 directly binds to the NF-κB subunit p50 and c-Jun (AP-1), and the ASC-1 complex stimulates transactivation by SRF, AP-1, and NF-κB. Microinjection of an anti-P50 (ASCC1) antibody inhibits AP-1 transactivation, and this inhibition is rescued by wild-type ASCC1 but not by a KH-domain mutant (P50ΔKH) that fails to interact with P200/ASCC3, establishing that the KH domain of ASCC1 mediates its interaction with ASCC3 and is required for ASC-1 complex coactivator function.\",\n      \"method\": \"Co-immunoprecipitation, single-cell microinjection of blocking antibody, transient transfection reporter assays, yeast two-hybrid, and dominant-negative expression of C. elegans ASC-1\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, antibody microinjection rescue, mutant complementation across multiple orthogonal methods in single study\",\n      \"pmids\": [\"12077347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Recessive loss-of-function mutations in ASCC1 cause prenatal-onset spinal muscular atrophy with arthrogryposis and congenital bone fractures in humans. Antisense morpholino knockdown of ascc1 in zebrafish disrupts α-motoneuron outgrowth, myotome formation, and neuromuscular junction development, causing a larval swimming defect. Immunoprecipitation of the ASC-1 complex consistently co-purifies CSRP1 (a transcriptional cofactor involved in spinal cord regeneration). ASCC1-mutant patient fibroblasts downregulate genes associated with neurogenesis, neuronal migration/pathfinding (SERPINF1, DAB1, SEMA3D, SEMA3A), and bone development (TNFRSF11B, RASSF2, STC1), placing ASCC1 in a transcriptional coactivator pathway essential for neuromuscular and skeletal development.\",\n      \"method\": \"Whole-exome sequencing, autozygosity mapping, antisense morpholino knockdown in zebrafish (neuromuscular phenotype readout), co-immunoprecipitation, gene expression profiling of patient fibroblasts\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (human genetics, zebrafish KD with defined phenotype, Co-IP, transcriptomics) in single study with strong functional validation\",\n      \"pmids\": [\"26924529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ASCC1 contains a putative RNA ligase-like domain (near its C terminus) and functions as a regulatory subunit of the ASCC complex during alkylation DNA damage. ASCC1 physically interacts with the ASCC3 helicase subunit of the complex. Prior to damage, ASCC1 localizes to nuclear speckle foci; upon alkylation damage it leaves these foci. Loss of ASCC1 (CRISPR/Cas9 knockout) causes alkylation damage sensitivity epistatic with ASCC3 loss. ASCC1 knockout dramatically increases ASCC3 foci formation during alkylation damage, yet most of these foci lack ASCC2, demonstrating that ASCC1 is required for proper co-recruitment of ASCC2 with ASCC3 to damage sites — i.e., ASCC1 coordinates correct assembly and recruitment of the ALKBH3–ASCC repair complex.\",\n      \"method\": \"CRISPR/Cas9 knockout, co-immunoprecipitation, fluorescence microscopy (foci analysis), alkylation sensitivity assays, epistasis analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with defined damage-sensitivity phenotype, Co-IP, localization imaging, and genetic epistasis, multiple orthogonal methods in single study\",\n      \"pmids\": [\"29997253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Three additional families with novel homozygous nonsense or frameshift mutations in ASCC1 present with severe prenatal-onset muscle weakness, neonatal hypotonia, arthrogryposis, and congenital bone fractures, expanding the mutation spectrum. Muscle biopsies from affected infants show intense oxidative rims beneath the sarcolemma and remnants of sarcomeres with enlarged Z-bands, potentially representing a histopathological hallmark of ASC-1 complex dysfunction in fetal muscle and bone development.\",\n      \"method\": \"Whole-exome/Sanger sequencing, muscle biopsy histology and electron microscopy, clinical genetics\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic and histological description without direct functional/biochemical mechanistic experiments; supports disease causality but limited mechanistic depth\",\n      \"pmids\": [\"30327447\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASCC1 is a KH-domain-containing subunit of the nuclear ASC-1 transcriptional coactivator complex (with TRIP4/ASC-1, ASCC2/P100, and ASCC3/P200) that directly binds ASCC3 and is required for proper complex assembly and coactivator function in AP-1, NF-κB, and SRF transactivation; during alkylation DNA damage it leaves nuclear speckles and coordinates the recruitment of ASCC2 alongside ASCC3 to damage sites in an epistatic relationship with ASCC3, and loss-of-function mutations in ASCC1 cause a severe prenatal neuromuscular and skeletal syndrome in humans accompanied by downregulation of neurogenesis and bone-development genes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ASCC1 is an accessory subunit of the ASC-1 (ASCC) complex that physically interacts with the ASCC3 helicase and coordinates proper assembly and recruitment of the full ASCC complex (including ASCC2) to sites of alkylation DNA damage, functioning epistatically with ASCC3 in the ALKBH3-ASCC alkylation repair pathway [PMID:29997253]. Under basal conditions ASCC1 localizes to nuclear speckle foci; upon alkylation damage it vacates these foci, and its loss results in aberrant ASCC3 foci that lack ASCC2, indicating a role in quality control of complex assembly, dependent on a C-terminal RNA-binding motif [PMID:29997253]. Recessive loss-of-function mutations in ASCC1 cause a severe congenital disorder characterized by prenatal-onset muscle weakness, arthrogryposis, and bone fractures, establishing a physiological requirement for the ASC-1 complex in fetal musculoskeletal development [PMID:30327447].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Establishing how ASCC1 integrates into the ASCC alkylation repair pathway: ASCC1 was shown to interact with ASCC3, localize to nuclear speckles, and coordinate proper ASCC complex assembly at damage sites, with its loss causing alkylation sensitivity epistatic with ASCC3, thereby defining ASCC1 as a functional component of the ALKBH3-ASCC pathway whose regulatory role depends on a C-terminal RNA-binding motif.\",\n      \"evidence\": \"Co-immunoprecipitation, live-cell imaging of nuclear speckle foci, CRISPR/Cas9 knockout alkylation sensitivity assays, epistasis analysis, and domain mutagenesis in human cells\",\n      \"pmids\": [\"29997253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The RNA species bound by the C-terminal motif have not been identified\",\n        \"The structural basis for the ASCC1-ASCC3 interaction is unknown\",\n        \"How ASCC1 departure from nuclear speckles is triggered by alkylation damage is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linking ASCC1 loss to a human developmental disorder: recessive nonsense and frameshift mutations in ASCC1 were shown to cause severe prenatal-onset muscle weakness, arthrogryposis, and congenital bone fractures, revealing an essential role for the ASC-1 complex in fetal musculoskeletal development.\",\n      \"evidence\": \"Clinical characterization and muscle biopsy analysis from multiple families with biallelic ASCC1 loss-of-function mutations\",\n      \"pmids\": [\"30327447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No molecular mechanism linking ASCC1 loss to the muscle and bone phenotype has been established\",\n        \"Whether the developmental phenotype reflects defective alkylation repair or an independent ASC-1 complex function is unknown\",\n        \"No animal model has been reported to recapitulate the disease phenotype\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how ASCC1's role in alkylation repair relates mechanistically to the severe developmental phenotype caused by its loss, and whether ASCC1 has additional functions beyond coordinating ASCC complex assembly.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No substrate or target RNA for the ASCC1 RNA-binding motif has been identified\",\n        \"The relationship between alkylation repair and musculoskeletal development has not been tested\",\n        \"Structural information for ASCC1 or the ASCC1-ASCC3 interface is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"ASC-1 (ASCC) complex\"],\n    \"partners\": [\"ASCC3\", \"ASCC2\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"ASCC1 is a KH-domain-containing subunit of the nuclear ASC-1 transcriptional coactivator complex (with TRIP4, ASCC2, and ASCC3) that directly binds ASCC3 via its KH domain, and this interaction is required for coactivator-dependent transactivation by AP-1, NF-κB, and SRF [PMID:12077347]. Beyond transcription, ASCC1 localizes to nuclear speckles and functions as a regulatory subunit during alkylation DNA damage repair: it departs speckle foci upon damage and is required for the coordinated co-recruitment of ASCC2 with ASCC3 to damage sites, with ASCC1 loss causing alkylation sensitivity epistatic with ASCC3 [PMID:29997253]. Recessive loss-of-function mutations in ASCC1 cause a severe prenatal-onset syndrome of spinal muscular atrophy with arthrogryposis and congenital bone fractures, accompanied by downregulation of neurogenesis and bone-development genes in patient fibroblasts, and disrupted motoneuron and neuromuscular junction development in zebrafish [PMID:26924529].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"The first mechanistic question—whether ASCC1 is a bona fide transcriptional coactivator subunit—was resolved by showing it is a stable nuclear component of the ASC-1 complex, directly binds NF-κB p50 and c-Jun, and that its KH-domain-mediated interaction with ASCC3 is essential for AP-1 coactivation.\",\n      \"evidence\": \"Co-immunoprecipitation, yeast two-hybrid, antibody microinjection with rescue, and reporter assays in HeLa cells\",\n      \"pmids\": [\"12077347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural detail of the KH-domain–ASCC3 interface\",\n        \"Mechanism by which ASCC1 stimulates transactivation beyond complex integrity unknown\",\n        \"Physiological roles beyond reporter-based transactivation not addressed\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"The question of ASCC1's in vivo relevance was answered by demonstrating that biallelic loss-of-function mutations cause prenatal spinal muscular atrophy with bone fractures in humans, and ascc1 knockdown in zebrafish disrupts motoneuron outgrowth and neuromuscular junction formation, linking ASC-1 complex coactivation to neuromuscular and skeletal development.\",\n      \"evidence\": \"Whole-exome sequencing, autozygosity mapping, zebrafish morpholino knockdown with phenotypic readout, co-immunoprecipitation (recovering CSRP1), and transcriptomic profiling of patient fibroblasts\",\n      \"pmids\": [\"26924529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct transcriptional targets of the ASC-1 complex in developing neurons and bone are inferred from expression profiling, not demonstrated by ChIP or functional rescue\",\n        \"Whether disease pathology is due solely to transcriptional coactivation defects or also to DNA repair impairment is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A dual function for ASCC1 was established: beyond transcription, ASCC1 coordinates the alkylation DNA damage response by controlling the co-recruitment of ASCC2 alongside ASCC3 to damage sites, with ASCC1 loss producing damage sensitivity epistatic with ASCC3 loss.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in human cells, co-immunoprecipitation, fluorescence microscopy foci analysis, and alkylation sensitivity/epistasis assays\",\n      \"pmids\": [\"29997253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The catalytic significance of the putative RNA ligase-like domain has not been biochemically tested\",\n        \"Whether ASCC1 contacts damaged DNA/RNA directly or acts solely via protein–protein scaffolding is unknown\",\n        \"Relationship between speckle localization and damage-response activation is mechanistically unexplained\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expansion of the ASCC1 mutation spectrum with additional loss-of-function alleles and identification of distinctive muscle histopathology (oxidative rims, Z-band enlargement) reinforced ASCC1 as the causative gene and suggested a histological hallmark of ASC-1 complex dysfunction.\",\n      \"evidence\": \"Whole-exome/Sanger sequencing, muscle biopsy histology and electron microscopy in three additional families\",\n      \"pmids\": [\"30327447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Histopathological observations lack functional or biochemical mechanistic explanation\",\n        \"No rescue or modeling experiments performed in this study\",\n        \"Whether muscle-specific pathology reflects transcriptional or DNA repair deficits is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved whether ASCC1's disease-associated phenotypes arise primarily from impaired transcriptional coactivation, defective alkylation damage repair, or both; the enzymatic activity of the putative RNA ligase-like domain and the structural basis of ASCC1's scaffolding function are also undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No biochemical reconstitution of the RNA ligase-like domain activity\",\n        \"No structure of ASCC1 or the ASCC1–ASCC3 interface\",\n        \"Relative contribution of transcription versus DNA repair functions to human disease not dissected\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\n      \"ASC-1 complex (TRIP4–ASCC1–ASCC2–ASCC3)\"\n    ],\n    \"partners\": [\n      \"ASCC3\",\n      \"TRIP4\",\n      \"ASCC2\",\n      \"CSRP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}