{"gene":"ELOF1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2021,"finding":"ELOF1 constitutively interacts with RNAPII close to K1268 and acts as a specificity factor that binds and positions the CRL4CSA ubiquitin ligase for optimal ubiquitylation of RNAPII at K1268 during transcription-coupled repair (TCR). ELOF1 loss prevents RNAPII ubiquitylation and downstream TCR factor assembly.","method":"CRISPR screen, Co-IP, drug-genetic interaction screening, cell biology","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional KO phenotype, independently replicated in the companion paper (PMID:34108662), two labs simultaneously","pmids":["34108663"],"is_preprint":false},{"year":2021,"finding":"ELOF1 promotes recruitment of TC-NER factors UVSSA and TFIIH to transcription-blocking lesions, enabling efficient repair and transcription resumption after DNA damage. ELOF1 also modulates transcription to protect cells against transcription-mediated replication stress and genome instability.","method":"Genome-wide CRISPR-Cas9 screen, immunofluorescence, transcription recovery assays, replication stress assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen, functional KO with defined TC-NER phenotype, independently replicated by companion paper (PMID:34108663)","pmids":["34108662"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structural analysis showed that ELOF1 serves as an adaptor to stably position UVSSA and CRL4CSA on arrested Pol II, leading to ligase neddylation and activation of Pol II ubiquitylation. In the presence of ELOF1, a TFIIS-like element in UVSSA becomes ordered and extends through the Pol II pore, preventing reactivation of Pol II by TFIIS.","method":"Cryo-electron microscopy, biochemical assays, cell biology, mutagenesis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with biochemical validation and mutagenesis, multiple orthogonal methods in a single rigorous study","pmids":["38316879"],"is_preprint":false},{"year":2024,"finding":"The yeast ELOF1 ortholog Elf1 promotes Rad26 (CSB ortholog) interactions with lesion-arrested Pol II. Cryo-EM structure of lesion-arrested Pol II-Rad26-Elf1 complex revealed that Elf1 induces additional interactions between Rad26 and lesion-arrested Pol II compared to other forms of stalled Pol II, facilitating TC-NER initiation.","method":"Cryo-EM structure determination, biochemical assays, genetic complementation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with biochemical and genetic validation, ortholog study in yeast with direct structural insight into conserved mechanism","pmids":["38194460"],"is_preprint":false},{"year":2024,"finding":"Cell-free reconstitution of TC-NER in frog egg extract demonstrated that ELOF1 is required for error-free repair of a site-specific lesion in a transcribed plasmid, establishing ELOF1 as an essential factor in the in vitro TC-NER reaction alongside CSB, CRL4CSA, and UVSSA.","method":"Cell-free TC-NER reconstitution in Xenopus egg extract, site-specific lesion plasmid, depletion assays, cryo-EM","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with site-specific lesion, depletion of ELOF1 abolishes repair, replicated across two independent Cell papers (PMID:39547228, PMID:39547229)","pmids":["39547228","39547229"],"is_preprint":false},{"year":2024,"finding":"ELOF1 is required for RNAPII ubiquitylation but STK19 loss does not impair this step; STK19 acts downstream of ELOF1-facilitated ubiquitylation to facilitate clearance of lesion-stalled RNAPII. ELOF1 functions together with UVSSA and STK19 to properly recruit and position TFIIH for lesion processing.","method":"Cryo-EM, mutational analysis, live-cell imaging of RNAPII clearance, TC-NER assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — cryo-EM plus functional assays, independently replicated in two simultaneous Cell papers","pmids":["39547228","39547229"],"is_preprint":false},{"year":2025,"finding":"ELOF1 stabilizes paused RNAPII at transcription barriers on antibody gene loci, providing a platform for AID-mediated transcription-coupled DNA damage. ELOF1 deficiency causes paused RNAPII to detach from chromatin, preventing recruitment of factors needed for both AID-induced damage and subsequent repair, resulting in defective class switch recombination and somatic hypermutation in mice.","method":"Genetic screen in B cells, mouse knockout, ChIP, proximity ligation, biochemical fractionation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse KO with defined immune phenotype, ChIP showing RNAPII chromatin detachment, two independent studies (PMID:40049162, PMID:40049160) using orthogonal methods","pmids":["40049162","40049160"],"is_preprint":false},{"year":2025,"finding":"ELOF1 must bind to RNAPII to serve as a proximity partner for AID and to function in somatic hypermutation and class switch recombination. Loss of ELOF1 reduces RNAPII pausing downstream of transcription start sites and reduces levels of serine-5 (but not serine-2) phosphorylated RNAPII throughout transcribed genes.","method":"Genetic complementation with RNAPII-binding mutants, ChIP-seq for RNAPII phospho-forms, proximity ligation assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-function mutagenesis of RNAPII-binding interface, ChIP-seq with two RNAPII phospho-forms, confirmed in two independent papers","pmids":["40049160","40049162"],"is_preprint":false},{"year":2020,"finding":"CRISPR screen identified ELOF1 as an RNAPII component whose loss modulates the response to transcription-blocking DNA-damaging agents, placing ELOF1 in the DNA damage response pathway for transcription-blocking lesions.","method":"CRISPR-Cas9 screen against genotoxic agents in RPE1 cells","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — large-scale CRISPR screen identifies sensitivity phenotype; no direct mechanistic follow-up for ELOF1 in this paper alone","pmids":["32649862"],"is_preprint":false},{"year":2019,"finding":"Mouse knockout of Elof1 results in peri-gastrulation lethality with developmental delay and morphological defects, and Elof1 regulates mutually exclusive exon use in vivo, suggesting a role in alternative splicing distinct from the yeast ortholog function.","method":"Mouse loss-of-function allele, phenotypic analysis, splice variant analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KO with defined developmental phenotype and alternative splicing analysis, single lab, limited mechanistic resolution","pmids":["31276560"],"is_preprint":false},{"year":2025,"finding":"ChIP-cryoEM of transcribing RNAPII complexes isolated from human nuclei determined cryo-EM structures of RNAPII elongation complexes associated with genomic DNA in distinct forms, including complexes with ELOF1 and SPT4/5 or SPT6, revealing the structural context of ELOF1 within the elongation complex on chromatin.","method":"Chromatin immunopurification coupled to cryo-EM (ChIP-cryoEM) from human nuclei","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — cryo-EM structure from native chromatin, single lab, ELOF1 is one of several factors analyzed without dedicated functional follow-up","pmids":["40436841"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structure of the activated Pol II elongation complex with IWS1 and ELOF1 showed that IWS1 transcription stimulation requires interactions with the RPB2 lobe and ELOF1, indicating ELOF1 cooperates with IWS1 to stimulate Pol II elongation velocity.","method":"Cryo-EM, in vitro transcription assays, rapid depletion (multi-omics kinetics)","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure plus in vitro functional assays, single lab, ELOF1's specific contribution partially inferred from complex structure","pmids":["40835814"],"is_preprint":false},{"year":2026,"finding":"ELOF1 is a core component of the promoter-proximal paused RNAPII complex. ELOF1 is enriched at the promoter-proximal region of genes; its rapid degradation reduces pause duration in cells. In reconstituted assays, ELOF1 potently enhances pausing induced by DSIF and NELF at physiological nucleotide concentrations. Cryo-EM structures show that DSIF-NELF-ELOF1 sterically clashes with TFIIF on RNAPII, and RNAPII-DSIF-NELF-ELOF1 (but not RNAPII-DSIF-NELF) counteracts positive effects of TFIIF.","method":"Rapid protein degradation (auxin-inducible), ChIP-seq/PRO-seq, cryo-EM, in vitro reconstituted pausing assays","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure combined with in vitro reconstitution and rapid depletion in cells with direct pause measurement; multiple orthogonal methods","pmids":["42244727"],"is_preprint":true},{"year":2026,"finding":"RNAPII ubiquitylation by CSB and CRL4CSA is essential for RNAPII clearance from damage sites; downstream of this ubiquitylation, ELOF1 (together with UVSSA and STK19) is required for proper TFIIH recruitment and positioning, enabling XPD helicase-driven RNAPII dissociation as the primary rapid clearance route.","method":"Time-resolved RNAPII clearance assay, live-cell imaging, genetic KO of TCR factors, VCP inhibition","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean time-resolved functional assay with multiple KO conditions establishing hierarchical pathway position of ELOF1, single lab with multiple orthogonal approaches","pmids":["41554717"],"is_preprint":false}],"current_model":"ELOF1 is a constitutive component of the RNA polymerase II elongation complex that serves dual roles: in transcription-coupled nucleotide excision repair (TC-NER), it acts as a specificity/adaptor factor that positions the CRL4CSA ubiquitin ligase on damage-stalled RNAPII for K1268 ubiquitylation and subsequently stabilizes UVSSA on the arrested complex to prevent TFIIS-mediated reactivation and to recruit/position TFIIH for lesion removal and RNAPII clearance; in normal transcription, ELOF1 is a core component of the promoter-proximal paused RNAPII complex (cooperating with DSIF and NELF against TFIIF) and cooperates with IWS1 to stimulate elongation velocity, while also stabilizing paused RNAPII to provide a scaffold for AID-mediated transcription-coupled DNA damage in B cells."},"narrative":{"mechanistic_narrative":"ELOF1 is a constitutive component of the RNA polymerase II (RNAPII) elongation complex that acts at the interface of transcription and DNA repair [PMID:34108663, PMID:40436841]. In transcription-coupled nucleotide excision repair (TC-NER), ELOF1 binds RNAPII near K1268 and functions as a specificity/adaptor factor that positions the CRL4CSA ubiquitin ligase for ubiquitylation of stalled RNAPII at K1268, a step required for downstream assembly of the repair machinery [PMID:34108663]. Structurally, ELOF1 stably docks UVSSA and CRL4CSA onto arrested RNAPII to drive ligase neddylation and activation, and orders a TFIIS-like element in UVSSA that extends into the polymerase pore to block TFIIS-mediated reactivation of the arrested complex [PMID:38316879]. Downstream of ubiquitylation, ELOF1 works together with UVSSA and STK19 to recruit and correctly position TFIIH, enabling XPD helicase-driven dissociation of lesion-stalled RNAPII and efficient repair and transcription recovery [PMID:34108662, PMID:39547228, PMID:39547229, PMID:41554717]. Cell-free reconstitution established ELOF1 as an essential factor for error-free TC-NER alongside CSB, CRL4CSA, and UVSSA [PMID:39547228, PMID:39547229], and its yeast ortholog Elf1 promotes Rad26(CSB) engagement of lesion-arrested polymerase, indicating a conserved mechanism [PMID:38194460]. Beyond repair, ELOF1 is a core component of the promoter-proximal paused RNAPII complex: it enhances DSIF/NELF-induced pausing and, within the RNAPII-DSIF-NELF-ELOF1 assembly, sterically counteracts TFIIF to stabilize pausing [PMID:42244727], while cooperating with IWS1 to stimulate elongation velocity in the activated complex [PMID:40835814]. This pausing/elongation scaffolding role is physiologically deployed in B cells, where ELOF1 stabilizes paused RNAPII at antibody loci to provide a platform for AID-mediated transcription-coupled damage required for class switch recombination and somatic hypermutation [PMID:40049162, PMID:40049160]. ELOF1 is required for mouse development, and its loss causes peri-gastrulation lethality together with altered mutually exclusive exon usage [PMID:31276560].","teleology":[{"year":2019,"claim":"Established that ELOF1 is essential in a mammalian organism and hinted at a transcription-linked function distinct from the yeast ortholog, framing it as more than a passive elongation factor.","evidence":"Mouse loss-of-function allele with phenotypic and splice-variant analysis","pmids":["31276560"],"confidence":"Medium","gaps":["Mechanism linking ELOF1 to exon choice not resolved","No molecular partners identified","Single lab, limited mechanistic resolution"]},{"year":2020,"claim":"Placed ELOF1 in the cellular response to transcription-blocking lesions by showing its loss alters sensitivity to genotoxic agents, before any repair mechanism was defined.","evidence":"CRISPR-Cas9 chemogenetic screen in RPE1 cells","pmids":["32649862"],"confidence":"Medium","gaps":["Phenotype only, no direct mechanistic role for ELOF1","Does not distinguish transcription vs repair function"]},{"year":2021,"claim":"Defined ELOF1 as the specificity factor that couples damage-stalled RNAPII to its ubiquitylation, answering how the CRL4CSA ligase is targeted to K1268 to initiate TC-NER.","evidence":"Genome-wide CRISPR screens, reciprocal Co-IP, and TC-NER/replication-stress assays in human cells (two companion papers)","pmids":["34108663","34108662"],"confidence":"High","gaps":["Structural basis of CRL4CSA positioning not yet resolved","Mechanism of UVSSA/TFIIH recruitment downstream not detailed"]},{"year":2024,"claim":"Provided the structural mechanism: ELOF1 acts as an adaptor that docks UVSSA and CRL4CSA on arrested Pol II to activate ubiquitylation and orders a UVSSA element that blocks TFIIS reactivation, explaining how the repair-competent complex is locked in.","evidence":"Cryo-EM with biochemical assays and mutagenesis; yeast Elf1-Rad26-Pol II cryo-EM; Xenopus egg extract cell-free TC-NER reconstitution; cryo-EM/functional ordering of STK19 downstream","pmids":["38316879","38194460","39547228","39547229"],"confidence":"High","gaps":["Precise XPD/TFIIH positioning step needed further definition","How ELOF1 dual function partitions between repair and normal transcription unresolved"]},{"year":2025,"claim":"Revealed ELOF1's role in normal transcription and immunity: it stabilizes paused RNAPII on chromatin as a platform for AID-driven mutagenesis, with RNAPII binding required for serine-5-phosphorylated pausing and antibody diversification.","evidence":"Mouse knockout, ChIP/ChIP-seq of RNAPII phospho-forms, proximity ligation, RNAPII-binding mutant complementation; native ChIP-cryoEM and IWS1-ELOF1 cryo-EM of elongation complexes","pmids":["40049162","40049160","40436841","40835814"],"confidence":"High","gaps":["How ELOF1 selectively stabilizes pausing versus stimulating elongation not fully reconciled","Direct ELOF1-AID interaction interface undefined"]},{"year":2026,"claim":"Defined ELOF1 as a core component of the paused RNAPII complex that enhances DSIF/NELF-induced pausing and counteracts TFIIF, and placed it hierarchically downstream of CSB/CRL4CSA ubiquitylation in TFIIH-driven RNAPII clearance.","evidence":"Cryo-EM with in vitro reconstituted pausing assays and auxin-inducible degradation (preprint); time-resolved RNAPII clearance assays with TCR-factor KOs and VCP inhibition","pmids":["42244727","41554717"],"confidence":"High","gaps":["Pausing data partly from a preprint awaiting peer review","Switch between pausing-stabilization and elongation-velocity roles not mechanistically defined"]},{"year":null,"claim":"How ELOF1 integrates its opposing activities — stabilizing promoter-proximal pausing versus stimulating elongation, and repair-specific adaptor function versus constitutive elongation role — through a single RNAPII-binding interface remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No model explaining context-dependent switching of ELOF1 activities","Regulatory inputs that toggle ELOF1 function unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11,12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[11,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,10]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[6,10]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,1,4,5]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,7]}],"complexes":["RNA polymerase II elongation complex","promoter-proximal paused RNAPII complex (DSIF-NELF-ELOF1)","TC-NER complex (with CSB, CRL4CSA, UVSSA)"],"partners":["POLR2A","CRL4CSA","UVSSA","STK19","IWS1","DSIF","NELF","CSB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P60002","full_name":"Transcription elongation factor 1 homolog","aliases":[],"length_aa":83,"mass_kda":9.5,"function":"Factor involved in transcription-coupled nucleotide excision repair (TC-NER), a mechanism that rapidly removes RNA polymerase II-blocking lesions from the transcribed strand of active genes (PubMed:34108662, PubMed:34108663, PubMed:38316879). Acts as a key adapter required to anchor TC-NER factors to RNA polymerase II: stably positions UVSSA and the DCX(ERCC8) complex (also named CSA complex) on arrested RNA polymerase II, leading to neddylation and activation of the DCX(ERCC8) complex and ubiquitination of RNA polymerase II (PubMed:38316879)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/P60002/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ELOF1","classification":"Not Classified","n_dependent_lines":418,"n_total_lines":1208,"dependency_fraction":0.34602649006622516},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ELOF1","total_profiled":1310},"omim":[{"mim_id":"619818","title":"ELONGATION FACTOR 1; ELOF1","url":"https://www.omim.org/entry/619818"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ELOF1"},"hgnc":{"alias_symbol":["MGC4549","ELF1"],"prev_symbol":[]},"alphafold":{"accession":"P60002","domains":[{"cath_id":"2.20.25.190","chopping":"22-81","consensus_level":"high","plddt":94.4123,"start":22,"end":81}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P60002","model_url":"https://alphafold.ebi.ac.uk/files/AF-P60002-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P60002-F1-predicted_aligned_error_v6.png","plddt_mean":86.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELOF1","jax_strain_url":"https://www.jax.org/strain/search?query=ELOF1"},"sequence":{"accession":"P60002","fasta_url":"https://rest.uniprot.org/uniprotkb/P60002.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P60002/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P60002"}},"corpus_meta":[{"pmid":"32649862","id":"PMC_32649862","title":"A Genetic Map of the Response to DNA Damage in Human Cells.","date":"2020","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/32649862","citation_count":456,"is_preprint":false},{"pmid":"34108663","id":"PMC_34108663","title":"ELOF1 is a transcription-coupled DNA repair factor that directs RNA polymerase II ubiquitylation.","date":"2021","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/34108663","citation_count":92,"is_preprint":false},{"pmid":"34108662","id":"PMC_34108662","title":"Elongation factor ELOF1 drives transcription-coupled repair and prevents genome instability.","date":"2021","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/34108662","citation_count":79,"is_preprint":false},{"pmid":"38316879","id":"PMC_38316879","title":"Structural basis for RNA polymerase II ubiquitylation and inactivation in transcription-coupled repair.","date":"2024","source":"Nature structural & molecular 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America","url":"https://pubmed.ncbi.nlm.nih.gov/38194460","citation_count":18,"is_preprint":false},{"pmid":"39476950","id":"PMC_39476950","title":"Chromatin Transcription Elongation - A Structural Perspective.","date":"2024","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/39476950","citation_count":13,"is_preprint":false},{"pmid":"32090358","id":"PMC_32090358","title":"RNA-Seq Analysis of Genetic and Transcriptome Network Effects of Dual-Trait Selection for Ethanol Preference and Withdrawal Using SOT and NOT Genetic Models.","date":"2020","source":"Alcoholism, clinical and experimental research","url":"https://pubmed.ncbi.nlm.nih.gov/32090358","citation_count":11,"is_preprint":false},{"pmid":"40057514","id":"PMC_40057514","title":"Molecular model of TFIIH recruitment to the transcription-coupled repair machinery.","date":"2025","source":"Nature 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molecular basis of human transcription-coupled DNA repair.","date":"2025","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/40764391","citation_count":6,"is_preprint":false},{"pmid":"40436841","id":"PMC_40436841","title":"Multiple structures of RNA polymerase II isolated from human nuclei by ChIP-CryoEM analysis.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40436841","citation_count":5,"is_preprint":false},{"pmid":"31276560","id":"PMC_31276560","title":"The elongation factor Elof1 is required for mammalian gastrulation.","date":"2019","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/31276560","citation_count":3,"is_preprint":false},{"pmid":"40835814","id":"PMC_40835814","title":"IWS1 positions downstream DNA to globally stimulate Pol II elongation.","date":"2025","source":"Nature 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/41921730","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11802,"output_tokens":3551,"usd":0.044335,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11140,"output_tokens":3218,"usd":0.068075,"stage2_stop_reason":"end_turn"},"total_usd":0.11241,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"ELOF1 constitutively interacts with RNAPII close to K1268 and acts as a specificity factor that binds and positions the CRL4CSA ubiquitin ligase for optimal ubiquitylation of RNAPII at K1268 during transcription-coupled repair (TCR). ELOF1 loss prevents RNAPII ubiquitylation and downstream TCR factor assembly.\",\n      \"method\": \"CRISPR screen, Co-IP, drug-genetic interaction screening, cell biology\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional KO phenotype, independently replicated in the companion paper (PMID:34108662), two labs simultaneously\",\n      \"pmids\": [\"34108663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ELOF1 promotes recruitment of TC-NER factors UVSSA and TFIIH to transcription-blocking lesions, enabling efficient repair and transcription resumption after DNA damage. ELOF1 also modulates transcription to protect cells against transcription-mediated replication stress and genome instability.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, immunofluorescence, transcription recovery assays, replication stress assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen, functional KO with defined TC-NER phenotype, independently replicated by companion paper (PMID:34108663)\",\n      \"pmids\": [\"34108662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structural analysis showed that ELOF1 serves as an adaptor to stably position UVSSA and CRL4CSA on arrested Pol II, leading to ligase neddylation and activation of Pol II ubiquitylation. In the presence of ELOF1, a TFIIS-like element in UVSSA becomes ordered and extends through the Pol II pore, preventing reactivation of Pol II by TFIIS.\",\n      \"method\": \"Cryo-electron microscopy, biochemical assays, cell biology, mutagenesis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with biochemical validation and mutagenesis, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"38316879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The yeast ELOF1 ortholog Elf1 promotes Rad26 (CSB ortholog) interactions with lesion-arrested Pol II. Cryo-EM structure of lesion-arrested Pol II-Rad26-Elf1 complex revealed that Elf1 induces additional interactions between Rad26 and lesion-arrested Pol II compared to other forms of stalled Pol II, facilitating TC-NER initiation.\",\n      \"method\": \"Cryo-EM structure determination, biochemical assays, genetic complementation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with biochemical and genetic validation, ortholog study in yeast with direct structural insight into conserved mechanism\",\n      \"pmids\": [\"38194460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cell-free reconstitution of TC-NER in frog egg extract demonstrated that ELOF1 is required for error-free repair of a site-specific lesion in a transcribed plasmid, establishing ELOF1 as an essential factor in the in vitro TC-NER reaction alongside CSB, CRL4CSA, and UVSSA.\",\n      \"method\": \"Cell-free TC-NER reconstitution in Xenopus egg extract, site-specific lesion plasmid, depletion assays, cryo-EM\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with site-specific lesion, depletion of ELOF1 abolishes repair, replicated across two independent Cell papers (PMID:39547228, PMID:39547229)\",\n      \"pmids\": [\"39547228\", \"39547229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ELOF1 is required for RNAPII ubiquitylation but STK19 loss does not impair this step; STK19 acts downstream of ELOF1-facilitated ubiquitylation to facilitate clearance of lesion-stalled RNAPII. ELOF1 functions together with UVSSA and STK19 to properly recruit and position TFIIH for lesion processing.\",\n      \"method\": \"Cryo-EM, mutational analysis, live-cell imaging of RNAPII clearance, TC-NER assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — cryo-EM plus functional assays, independently replicated in two simultaneous Cell papers\",\n      \"pmids\": [\"39547228\", \"39547229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELOF1 stabilizes paused RNAPII at transcription barriers on antibody gene loci, providing a platform for AID-mediated transcription-coupled DNA damage. ELOF1 deficiency causes paused RNAPII to detach from chromatin, preventing recruitment of factors needed for both AID-induced damage and subsequent repair, resulting in defective class switch recombination and somatic hypermutation in mice.\",\n      \"method\": \"Genetic screen in B cells, mouse knockout, ChIP, proximity ligation, biochemical fractionation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse KO with defined immune phenotype, ChIP showing RNAPII chromatin detachment, two independent studies (PMID:40049162, PMID:40049160) using orthogonal methods\",\n      \"pmids\": [\"40049162\", \"40049160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELOF1 must bind to RNAPII to serve as a proximity partner for AID and to function in somatic hypermutation and class switch recombination. Loss of ELOF1 reduces RNAPII pausing downstream of transcription start sites and reduces levels of serine-5 (but not serine-2) phosphorylated RNAPII throughout transcribed genes.\",\n      \"method\": \"Genetic complementation with RNAPII-binding mutants, ChIP-seq for RNAPII phospho-forms, proximity ligation assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-function mutagenesis of RNAPII-binding interface, ChIP-seq with two RNAPII phospho-forms, confirmed in two independent papers\",\n      \"pmids\": [\"40049160\", \"40049162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CRISPR screen identified ELOF1 as an RNAPII component whose loss modulates the response to transcription-blocking DNA-damaging agents, placing ELOF1 in the DNA damage response pathway for transcription-blocking lesions.\",\n      \"method\": \"CRISPR-Cas9 screen against genotoxic agents in RPE1 cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — large-scale CRISPR screen identifies sensitivity phenotype; no direct mechanistic follow-up for ELOF1 in this paper alone\",\n      \"pmids\": [\"32649862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mouse knockout of Elof1 results in peri-gastrulation lethality with developmental delay and morphological defects, and Elof1 regulates mutually exclusive exon use in vivo, suggesting a role in alternative splicing distinct from the yeast ortholog function.\",\n      \"method\": \"Mouse loss-of-function allele, phenotypic analysis, splice variant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KO with defined developmental phenotype and alternative splicing analysis, single lab, limited mechanistic resolution\",\n      \"pmids\": [\"31276560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ChIP-cryoEM of transcribing RNAPII complexes isolated from human nuclei determined cryo-EM structures of RNAPII elongation complexes associated with genomic DNA in distinct forms, including complexes with ELOF1 and SPT4/5 or SPT6, revealing the structural context of ELOF1 within the elongation complex on chromatin.\",\n      \"method\": \"Chromatin immunopurification coupled to cryo-EM (ChIP-cryoEM) from human nuclei\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — cryo-EM structure from native chromatin, single lab, ELOF1 is one of several factors analyzed without dedicated functional follow-up\",\n      \"pmids\": [\"40436841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure of the activated Pol II elongation complex with IWS1 and ELOF1 showed that IWS1 transcription stimulation requires interactions with the RPB2 lobe and ELOF1, indicating ELOF1 cooperates with IWS1 to stimulate Pol II elongation velocity.\",\n      \"method\": \"Cryo-EM, in vitro transcription assays, rapid depletion (multi-omics kinetics)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure plus in vitro functional assays, single lab, ELOF1's specific contribution partially inferred from complex structure\",\n      \"pmids\": [\"40835814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ELOF1 is a core component of the promoter-proximal paused RNAPII complex. ELOF1 is enriched at the promoter-proximal region of genes; its rapid degradation reduces pause duration in cells. In reconstituted assays, ELOF1 potently enhances pausing induced by DSIF and NELF at physiological nucleotide concentrations. Cryo-EM structures show that DSIF-NELF-ELOF1 sterically clashes with TFIIF on RNAPII, and RNAPII-DSIF-NELF-ELOF1 (but not RNAPII-DSIF-NELF) counteracts positive effects of TFIIF.\",\n      \"method\": \"Rapid protein degradation (auxin-inducible), ChIP-seq/PRO-seq, cryo-EM, in vitro reconstituted pausing assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure combined with in vitro reconstitution and rapid depletion in cells with direct pause measurement; multiple orthogonal methods\",\n      \"pmids\": [\"42244727\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"RNAPII ubiquitylation by CSB and CRL4CSA is essential for RNAPII clearance from damage sites; downstream of this ubiquitylation, ELOF1 (together with UVSSA and STK19) is required for proper TFIIH recruitment and positioning, enabling XPD helicase-driven RNAPII dissociation as the primary rapid clearance route.\",\n      \"method\": \"Time-resolved RNAPII clearance assay, live-cell imaging, genetic KO of TCR factors, VCP inhibition\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean time-resolved functional assay with multiple KO conditions establishing hierarchical pathway position of ELOF1, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"41554717\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELOF1 is a constitutive component of the RNA polymerase II elongation complex that serves dual roles: in transcription-coupled nucleotide excision repair (TC-NER), it acts as a specificity/adaptor factor that positions the CRL4CSA ubiquitin ligase on damage-stalled RNAPII for K1268 ubiquitylation and subsequently stabilizes UVSSA on the arrested complex to prevent TFIIS-mediated reactivation and to recruit/position TFIIH for lesion removal and RNAPII clearance; in normal transcription, ELOF1 is a core component of the promoter-proximal paused RNAPII complex (cooperating with DSIF and NELF against TFIIF) and cooperates with IWS1 to stimulate elongation velocity, while also stabilizing paused RNAPII to provide a scaffold for AID-mediated transcription-coupled DNA damage in B cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ELOF1 is a constitutive component of the RNA polymerase II (RNAPII) elongation complex that acts at the interface of transcription and DNA repair [#0, #10]. In transcription-coupled nucleotide excision repair (TC-NER), ELOF1 binds RNAPII near K1268 and functions as a specificity/adaptor factor that positions the CRL4CSA ubiquitin ligase for ubiquitylation of stalled RNAPII at K1268, a step required for downstream assembly of the repair machinery [#0]. Structurally, ELOF1 stably docks UVSSA and CRL4CSA onto arrested RNAPII to drive ligase neddylation and activation, and orders a TFIIS-like element in UVSSA that extends into the polymerase pore to block TFIIS-mediated reactivation of the arrested complex [#2]. Downstream of ubiquitylation, ELOF1 works together with UVSSA and STK19 to recruit and correctly position TFIIH, enabling XPD helicase-driven dissociation of lesion-stalled RNAPII and efficient repair and transcription recovery [#1, #5, #13]. Cell-free reconstitution established ELOF1 as an essential factor for error-free TC-NER alongside CSB, CRL4CSA, and UVSSA [#4], and its yeast ortholog Elf1 promotes Rad26(CSB) engagement of lesion-arrested polymerase, indicating a conserved mechanism [#3]. Beyond repair, ELOF1 is a core component of the promoter-proximal paused RNAPII complex: it enhances DSIF/NELF-induced pausing and, within the RNAPII-DSIF-NELF-ELOF1 assembly, sterically counteracts TFIIF to stabilize pausing [#12], while cooperating with IWS1 to stimulate elongation velocity in the activated complex [#11]. This pausing/elongation scaffolding role is physiologically deployed in B cells, where ELOF1 stabilizes paused RNAPII at antibody loci to provide a platform for AID-mediated transcription-coupled damage required for class switch recombination and somatic hypermutation [#6, #7]. ELOF1 is required for mouse development, and its loss causes peri-gastrulation lethality together with altered mutually exclusive exon usage [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 2019,\n      \"claim\": \"Established that ELOF1 is essential in a mammalian organism and hinted at a transcription-linked function distinct from the yeast ortholog, framing it as more than a passive elongation factor.\",\n      \"evidence\": \"Mouse loss-of-function allele with phenotypic and splice-variant analysis\",\n      \"pmids\": [\"31276560\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism linking ELOF1 to exon choice not resolved\", \"No molecular partners identified\", \"Single lab, limited mechanistic resolution\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed ELOF1 in the cellular response to transcription-blocking lesions by showing its loss alters sensitivity to genotoxic agents, before any repair mechanism was defined.\",\n      \"evidence\": \"CRISPR-Cas9 chemogenetic screen in RPE1 cells\",\n      \"pmids\": [\"32649862\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Phenotype only, no direct mechanistic role for ELOF1\", \"Does not distinguish transcription vs repair function\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined ELOF1 as the specificity factor that couples damage-stalled RNAPII to its ubiquitylation, answering how the CRL4CSA ligase is targeted to K1268 to initiate TC-NER.\",\n      \"evidence\": \"Genome-wide CRISPR screens, reciprocal Co-IP, and TC-NER/replication-stress assays in human cells (two companion papers)\",\n      \"pmids\": [\"34108663\", \"34108662\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Structural basis of CRL4CSA positioning not yet resolved\", \"Mechanism of UVSSA/TFIIH recruitment downstream not detailed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided the structural mechanism: ELOF1 acts as an adaptor that docks UVSSA and CRL4CSA on arrested Pol II to activate ubiquitylation and orders a UVSSA element that blocks TFIIS reactivation, explaining how the repair-competent complex is locked in.\",\n      \"evidence\": \"Cryo-EM with biochemical assays and mutagenesis; yeast Elf1-Rad26-Pol II cryo-EM; Xenopus egg extract cell-free TC-NER reconstitution; cryo-EM/functional ordering of STK19 downstream\",\n      \"pmids\": [\"38316879\", \"38194460\", \"39547228\", \"39547229\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Precise XPD/TFIIH positioning step needed further definition\", \"How ELOF1 dual function partitions between repair and normal transcription unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed ELOF1's role in normal transcription and immunity: it stabilizes paused RNAPII on chromatin as a platform for AID-driven mutagenesis, with RNAPII binding required for serine-5-phosphorylated pausing and antibody diversification.\",\n      \"evidence\": \"Mouse knockout, ChIP/ChIP-seq of RNAPII phospho-forms, proximity ligation, RNAPII-binding mutant complementation; native ChIP-cryoEM and IWS1-ELOF1 cryo-EM of elongation complexes\",\n      \"pmids\": [\"40049162\", \"40049160\", \"40436841\", \"40835814\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"How ELOF1 selectively stabilizes pausing versus stimulating elongation not fully reconciled\", \"Direct ELOF1-AID interaction interface undefined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined ELOF1 as a core component of the paused RNAPII complex that enhances DSIF/NELF-induced pausing and counteracts TFIIF, and placed it hierarchically downstream of CSB/CRL4CSA ubiquitylation in TFIIH-driven RNAPII clearance.\",\n      \"evidence\": \"Cryo-EM with in vitro reconstituted pausing assays and auxin-inducible degradation (preprint); time-resolved RNAPII clearance assays with TCR-factor KOs and VCP inhibition\",\n      \"pmids\": [\"42244727\", \"41554717\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Pausing data partly from a preprint awaiting peer review\", \"Switch between pausing-stabilization and elongation-velocity roles not mechanistically defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ELOF1 integrates its opposing activities — stabilizing promoter-proximal pausing versus stimulating elongation, and repair-specific adaptor function versus constitutive elongation role — through a single RNAPII-binding interface remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No model explaining context-dependent switching of ELOF1 activities\", \"Regulatory inputs that toggle ELOF1 function unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 10]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [6, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 1, 4, 5]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"complexes\": [\n      \"RNA polymerase II elongation complex\",\n      \"promoter-proximal paused RNAPII complex (DSIF-NELF-ELOF1)\",\n      \"TC-NER complex (with CSB, CRL4CSA, UVSSA)\"\n    ],\n    \"partners\": [\n      \"POLR2A\",\n      \"CRL4CSA\",\n      \"UVSSA\",\n      \"STK19\",\n      \"IWS1\",\n      \"DSIF\",\n      \"NELF\",\n      \"CSB\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}