{"gene":"NELFE","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2006,"finding":"The RRM (RNA Recognition Motif) of NELF-E adopts a βαββαβ fold in solution and directly binds HIV-1 TAR RNA with Kd values in the low-micromolar range, demonstrated using NMR structure determination and fluorescence equilibrium titrations with fluorescently labeled single-stranded and double-stranded oligoribonucleotides.","method":"NMR solution structure determination; fluorescence equilibrium titration with fluorescently labeled RNA oligonucleotides","journal":"The Biochemical Journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional RNA-binding validation using quantitative biochemistry in a single rigorous study","pmids":["16898873"],"is_preprint":false},{"year":2008,"finding":"RNA binding to NELF-E RRM induces a major conformational change: the C-terminal region, which is unstructured in the free protein, forms an α-helix upon TAR RNA binding, and large chemical shift perturbations also occur in the loop between β3 and α2, regions distant from the canonical RRM binding interface. The RNA-bound NELF-E RRM structure closely resembles RNA-bound U1A RRM.","method":"NMR spectroscopy (chemical shift perturbation mapping); solution structure determination of RNA-bound NELF-E RRM","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR solution structure of RNA-bound form with conformational change mapped at residue resolution, single lab but multiple orthogonal NMR methods","pmids":["18303858"],"is_preprint":false},{"year":2014,"finding":"NELF-E contains an RRM that recognizes a specific consensus RNA element (NBE: CUGAGGA(U) for Drosophila NELF-E) identified by in vitro SELEX. An NBE-like element is present in the loop region of HIV-1 TAR RNA and is required for high-affinity binding. NBE sequences are enriched +20 to +30 nucleotides downstream of transcription start sites genome-wide in paused genes, supporting a role for NELF-E RNA binding in promoter-proximal Pol II pausing.","method":"In vitro SELEX (systematic evolution of ligands by exponential enrichment); quantitative binding assays; genome-wide bioinformatic analysis of NBE distribution; nuclear run-on SELEX","journal":"PLoS Genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution (SELEX + quantitative biochemistry) combined with genome-wide functional validation, multiple orthogonal methods in one study","pmids":["24453987"],"is_preprint":false},{"year":2017,"finding":"NELF-E (and NELF-A) are rapidly recruited to DNA double-strand break (DSB) sites in a PARP1-dependent manner, preferentially at DSBs upstream of transcriptionally active genes where RNA Pol II is present. NELF-E recruitment and its repressive activity are required to switch off transcription at DSBs, and NELF-E is required for intact DSB repair.","method":"I-SceI endonuclease and CRISPR-Cas9 DSB induction systems; live-cell recruitment assays (imaging); PARP1 inhibition epistasis; RNA Pol II ChIP/depletion; loss-of-function (knockdown) with transcription and repair readouts","journal":"EMBO Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal DSB induction systems, PARP1 epistasis, Pol II requirement established, functional phenotypes for transcription repression and repair, single lab with rigorous controls","pmids":["28336775"],"is_preprint":false},{"year":2017,"finding":"The C-terminal peptide of NELF-E binds directly to the nuclear cap-binding complex (CBC) in a manner that is enhanced when CBC is bound to a cap analogue. The NELF-E C-terminal peptide and the homologous C-terminal peptide of ARS2 bind identically to CBC, forming mutually exclusive complexes. NELF-E binding to CBC is incompatible with PHAX binding, defining two mutually exclusive complexes: CBC-NELF-E and CBC-ARS2-PHAX.","method":"Crystal structure determination; biochemical binding assays; co-crystallization with cap analogue; competition binding experiments","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of CBC-NELF-E complex with functional validation by competition binding and cap-analogue enhancement, multiple orthogonal methods in one rigorous study","pmids":["29101316"],"is_preprint":false},{"year":2017,"finding":"Oncogenic activation of NELFE via somatic copy-number alterations enhances MYC signaling and promotes hepatocellular carcinoma (HCC) progression. NELFE selectively regulates MYC-associated genes, inducing a unique tumor transcriptome.","method":"Analysis of 1,225 clinical HCC samples; somatic copy-number alteration analysis; functional studies in HCC cells; transcriptomic analysis of NELFE-regulated genes","journal":"Cancer Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — large clinical cohort combined with functional cell-based experiments linking NELFE copy number to MYC target gene regulation, single lab","pmids":["28697339"],"is_preprint":false},{"year":2019,"finding":"NELFE promotes pancreatic cancer metastasis and epithelial-to-mesenchymal transition (EMT) by decreasing the mRNA stability of NDRG2, thereby activating the Wnt/β-catenin signaling pathway. NELFE directly binds the NDRG2 mRNA as shown by RNA immunoprecipitation.","method":"shRNA knockdown; mRNA decay assays; RNA immunoprecipitation (RIP); luciferase reporter assays; transwell invasion/migration assays; western blotting for β-catenin pathway components","journal":"International Journal of Oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP demonstrates direct NELFE-NDRG2 mRNA interaction; mRNA decay assays show mechanistic regulation; multiple functional readouts, single lab","pmids":["31638184"],"is_preprint":false},{"year":2021,"finding":"NELFE promotes gastric cancer growth and metastasis by binding the 3'UTR of E2F2 mRNA and increasing E2F2 mRNA stability. Overexpression of E2F2 rescues the proliferation and migration defects caused by NELFE knockdown, placing NELFE upstream of E2F2.","method":"shRNA knockdown; RNA binding to 3'UTR (RIP implied); mRNA stability assays; rescue experiments with E2F2 overexpression; xenograft in vivo experiments; transwell assays","journal":"Frontiers in Oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by rescue experiment places NELFE upstream of E2F2; mRNA stability mechanistically linked to 3'UTR binding; single lab","pmids":["34295816"],"is_preprint":false},{"year":2021,"finding":"NELFE activates CSNK2B expression through the Wnt/β-catenin signaling pathway in gastric cancer. Gain- and loss-of-function experiments demonstrated that NELFE potentiates gastric cancer cell proliferation and metastasis in vitro and in vivo, with CSNK2B identified as a downstream effector using a 10-pathway reporter array and dual-luciferase reporter assays.","method":"Gain- and loss-of-function (siRNA/overexpression); Cignal Finder 10-Pathway Reporter Array; dual-luciferase reporter assays; CCK-8, colony formation, transwell assays; nude mouse xenograft model; IHC on consecutive sections","journal":"Journal of Experimental & Clinical Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway array plus luciferase reporter validation identifies signaling axis; functional rescue with multiple assays; single lab","pmids":["33526068"],"is_preprint":false},{"year":2023,"finding":"NELF-E co-opts the EMT transcription factor SLUG as a chromatin partner during breast cancer EMT, and NELF-E loss impairs SLUG binding on chromatin. The histone acetyltransferase KAT2B is identified as a key functional downstream target of the NELF-E–SLUG axis, with KAT2B regulating EMT marker expression. NELF complex inhibition downregulates EMT and stemness-associated genes.","method":"Quantitative multiplexed Rapid Immunoprecipitation Mass spectrometry of Endogenous proteins (qPLEX-RIME); ChIP assays for SLUG binding; loss-of-function (NELF-E knockdown/knockout); genetic and pharmacological KAT2B inactivation; integrative transcriptomics and genomics; cancer cell lines and patient-derived tumor organoids","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — qPLEX-RIME identifies NELF-E chromatin partners; ChIP demonstrates SLUG dependency; pharmacological and genetic KAT2B inactivation phenocopies NELF ablation; multiple orthogonal methods across cell lines and organoids","pmids":["37117180"],"is_preprint":false},{"year":2025,"finding":"In Drosophila, NELF-E mRNA is a top interactor of the cap-binding protein 4EHP. Knockdown of NELF-E reduces multiple subunits of the 40S ribosome (RpS) and eIF3 translation initiation factor subunits, and NELF-E knockdown suppresses ATF4 expression and its target genes, placing NELF-E in an ATF4 regulatory network with 4EHP, 40S ribosome, and eIF3.","method":"TRIBE (Targets of RNA Binding through Editing) screen to identify 4EHP-NELF-E mRNA interaction; quantitative proteomics after NELF-E knockdown; genetic epistasis (knockdown of NELF-E, 4EHP, RpS12, eIF3l, eIF3h with ATF4 reporter readout); Drosophila larval fat body in vivo model","journal":"Nature Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TRIBE screen identifies 4EHP-NELF-E mRNA interaction; quantitative proteomics + genetic epistasis; in vivo Drosophila model; single lab with multiple orthogonal methods","pmids":["41436469"],"is_preprint":false},{"year":2025,"finding":"NELFE undergoes liquid-liquid phase separation (LLPS) mediated by two low-complexity sequences, forming distinct nuclear foci. NELFE phase-separates with SMARCB1 to modulate chromatin accessibility, downregulating pro-apoptotic genes through Pol II pausing while activating pro-growth signals, thereby promoting HCC progression.","method":"Phase separation assays (LLPS); identification of low-complexity sequences; co-IP/interaction studies with SMARCB1; ATAC-seq or equivalent chromatin accessibility assays; Pol II pausing analysis; loss-of-function with apoptotic and growth gene expression readouts","journal":"Research Square (preprint)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint; abstract-level description of LLPS and SMARCB1 interaction without full methodological detail; single lab, methods not fully specified in abstract","pmids":["40313774"],"is_preprint":true}],"current_model":"NELFE (NELF-E) is the RNA-binding subunit of the heterotetrameric Negative Elongation Factor (NELF) complex; its RRM adopts a βαββαβ fold that undergoes a conformational change upon RNA binding (forming a C-terminal helix), recognizes a consensus NBE sequence (CUGAGGA(U)) enriched near transcription start sites of paused genes, binds the CBC via its C-terminal peptide in a mutually exclusive manner with ARS2/PHAX, is recruited to DNA double-strand breaks in a PARP1- and RNA Pol II-dependent manner to repress transcription and facilitate repair, and acts oncogenically in multiple cancers by stabilizing or destabilizing target mRNAs (e.g., E2F2, NDRG2), co-opting the EMT transcription factor SLUG to regulate KAT2B-dependent chromatin changes, and potentially forming phase-separated condensates with SMARCB1 to modulate chromatin accessibility and Pol II pausing."},"narrative":{"mechanistic_narrative":"NELFE is the RNA-binding subunit of the Negative Elongation Factor complex that couples nascent transcript recognition to promoter-proximal RNA Polymerase II pausing [PMID:24453987]. Its RNA Recognition Motif adopts a βαββαβ fold and binds RNA directly, undergoing a conformational change in which its C-terminal region folds into an α-helix upon engaging RNA [PMID:16898873, PMID:18303858]; through this RRM it recognizes a defined consensus element (NBE, CUGAGGA(U)) that is enriched 20–30 nucleotides downstream of transcription start sites at paused genes, linking sequence-specific RNA binding to the pausing function [PMID:24453987]. A C-terminal peptide of NELFE binds the nuclear cap-binding complex in a manner mutually exclusive with ARS2/PHAX, defining a distinct CBC–NELFE complex at capped nascent transcripts [PMID:29101316]. Beyond steady-state transcription, NELFE is recruited to DNA double-strand breaks in a PARP1- and Pol II-dependent manner to shut off local transcription and enable repair [PMID:28336775]. NELFE also acts oncogenically across multiple cancers, both by post-transcriptionally tuning target mRNA stability—destabilizing NDRG2 to activate Wnt/β-catenin signaling and EMT in pancreatic cancer [PMID:31638184] and stabilizing E2F2 via its 3'UTR in gastric cancer [PMID:34295816]—and by co-opting the EMT transcription factor SLUG as a chromatin partner to drive a KAT2B-dependent transcriptional program [PMID:37117180]. In hepatocellular carcinoma, NELFE amplification enhances MYC signaling and reprograms the tumor transcriptome [PMID:28697339].","teleology":[{"year":2006,"claim":"Established that NELFE's RRM is a bona fide RNA-binding module by determining its fold and demonstrating direct, quantifiable binding to a viral RNA element.","evidence":"NMR solution structure and fluorescence equilibrium titrations with labeled RNA oligonucleotides (HIV-1 TAR)","pmids":["16898873"],"confidence":"High","gaps":["Did not define a physiological cellular RNA target","Binding measured only against TAR RNA in vitro"]},{"year":2008,"claim":"Revealed the structural mechanism of RNA recognition, showing that RNA binding drives a major conformational change including formation of a C-terminal helix.","evidence":"NMR chemical-shift perturbation mapping and solution structure of the RNA-bound RRM","pmids":["18303858"],"confidence":"High","gaps":["Functional consequence of the conformational change in vivo not tested","Studied as isolated RRM, not within the NELF complex"]},{"year":2014,"claim":"Connected NELFE's RNA-binding specificity to its biological role by identifying a consensus element enriched at paused promoters genome-wide.","evidence":"In vitro SELEX, quantitative binding assays, and genome-wide bioinformatic analysis of NBE distribution","pmids":["24453987"],"confidence":"High","gaps":["Direct demonstration that NBE engagement controls pausing at endogenous genes not shown","Consensus defined for Drosophila NELF-E"]},{"year":2017,"claim":"Extended NELFE function beyond steady-state transcription, showing it represses transcription at DNA double-strand breaks to facilitate repair.","evidence":"I-SceI and CRISPR DSB induction, live-cell recruitment imaging, PARP1 inhibition epistasis, and Pol II depletion with repair readouts","pmids":["28336775"],"confidence":"High","gaps":["Molecular basis of PARP1-dependent recruitment unresolved","Whether RRM RNA binding is required at DSBs not established"]},{"year":2017,"claim":"Defined a structural interface linking NELFE to cap-bound transcripts, showing it binds the cap-binding complex mutually exclusively with ARS2/PHAX.","evidence":"Crystal structure of CBC–NELFE, cap-analogue co-crystallization, and competition binding","pmids":["29101316"],"confidence":"High","gaps":["Functional outcome of CBC–NELFE versus CBC–ARS2–PHAX partitioning in cells not determined","Cap-dependent vs RRM-dependent recruitment not integrated"]},{"year":2017,"claim":"Implicated NELFE as an oncogenic driver, showing copy-number-driven activation enhances MYC signaling in hepatocellular carcinoma.","evidence":"Analysis of 1,225 clinical HCC samples, somatic copy-number analysis, and functional transcriptomic studies in HCC cells","pmids":["28697339"],"confidence":"Medium","gaps":["Mechanism by which NELFE selects MYC-associated genes not defined","Single lab"]},{"year":2019,"claim":"Identified a post-transcriptional oncogenic mechanism in which NELFE destabilizes NDRG2 mRNA to activate Wnt/β-catenin signaling and EMT.","evidence":"shRNA knockdown, mRNA decay assays, RIP, luciferase reporters, and invasion assays in pancreatic cancer","pmids":["31638184"],"confidence":"Medium","gaps":["RNA element on NDRG2 bound by NELFE not mapped","Single lab"]},{"year":2021,"claim":"Showed NELFE can also stabilize target mRNAs, binding the E2F2 3'UTR to promote gastric cancer growth, with E2F2 placed downstream by rescue.","evidence":"shRNA knockdown, mRNA stability assays, E2F2 overexpression rescue, and xenograft experiments","pmids":["34295816","33526068"],"confidence":"Medium","gaps":["How NELFE switches between stabilizing and destabilizing outcomes unknown","Direct vs indirect 3'UTR binding not fully resolved"]},{"year":2023,"claim":"Connected NELFE to a chromatin-level oncogenic program, showing it partners with SLUG and drives KAT2B-dependent EMT gene expression.","evidence":"qPLEX-RIME chromatin interactomics, SLUG ChIP, NELFE loss-of-function, and genetic/pharmacological KAT2B inactivation in cell lines and organoids","pmids":["37117180"],"confidence":"High","gaps":["Whether SLUG recruitment depends on NELFE's RRM or NELF complex integrity not dissected","Relationship to pausing function unclear"]},{"year":2025,"claim":"Placed NELFE in a translation-initiation regulatory network, with its mRNA as a 4EHP interactor and its loss affecting 40S/eIF3 levels and ATF4 output.","evidence":"TRIBE screen, quantitative proteomics, and genetic epistasis with ATF4 reporter in Drosophila fat body","pmids":["41436469"],"confidence":"Medium","gaps":["Mechanism connecting NELF-E to ribosome subunit levels unknown","Conservation in mammals not established"]},{"year":2025,"claim":"Proposed that NELFE phase-separates with SMARCB1 to remodel chromatin accessibility and Pol II pausing in HCC.","evidence":"LLPS assays, low-complexity sequence mapping, SMARCB1 interaction studies, and chromatin accessibility/Pol II pausing readouts (preprint)","pmids":["40313774"],"confidence":"Low","gaps":["Preprint; methods not fully specified and not independently confirmed","Physiological role of condensates versus complex-based pausing unresolved"]},{"year":null,"claim":"How NELFE's well-defined RRM/NBE pausing function mechanistically integrates with its diverse cytoplasmic and oncogenic mRNA-stability and chromatin-partner roles remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking sequence-specific RNA binding to mRNA stability control","Whether mRNA-stability functions occur within or outside the NELF complex is unknown","Structural basis of target mRNA selection in cancers not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,2,6,7]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,3,9]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,9,11]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,3,9]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[6,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,6,7,9]}],"complexes":["NELF complex","CBC-NELFE complex"],"partners":["NCBP1","ARS2","SLUG","SMARCB1","PARP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P18615","full_name":"Negative elongation factor E","aliases":["RNA-binding protein RD"],"length_aa":380,"mass_kda":43.2,"function":"Essential component of the NELF complex, a complex that negatively regulates the elongation of transcription by RNA polymerase II (PubMed:10199401, PubMed:27256882). The NELF complex, which acts via an association with the DSIF complex and causes transcriptional pausing, is counteracted by the P-TEFb kinase complex (PubMed:11940650, PubMed:12612062, PubMed:27256882). Provides the strongest RNA binding activity of the NELF complex and may initially recruit the NELF complex to RNA (PubMed:18303858, PubMed:27256882, PubMed:27282391) (Microbial infection) The NELF complex is involved in HIV-1 latency possibly involving recruitment of PCF11 to paused RNA polymerase II","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/P18615/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NELFE","classification":"Common Essential","n_dependent_lines":562,"n_total_lines":1208,"dependency_fraction":0.4652317880794702},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"POLR2B","stoichiometry":4.0},{"gene":"SUPT5H","stoichiometry":4.0},{"gene":"INTS5","stoichiometry":0.2},{"gene":"POLR2E","stoichiometry":0.2},{"gene":"POLR2F","stoichiometry":0.2},{"gene":"POLR2K","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NELFE","total_profiled":1310},"omim":[{"mim_id":"621228","title":"LONG INTERGENIC NONCODING RNA 1013; LINC01013","url":"https://www.omim.org/entry/621228"},{"mim_id":"611180","title":"NEGATIVE ELONGATION FACTOR COMPLEX, MEMBER B; NELFB","url":"https://www.omim.org/entry/611180"},{"mim_id":"606026","title":"NEGATIVE ELONGATION FACTOR COMPLEX, MEMBER A; NELFA","url":"https://www.omim.org/entry/606026"},{"mim_id":"605297","title":"NEGATIVE ELONGATION FACTOR COMPLEX, MEMBER C/D; NELFCD","url":"https://www.omim.org/entry/605297"},{"mim_id":"173870","title":"POLY(ADP-RIBOSE) POLYMERASE 1; PARP1","url":"https://www.omim.org/entry/173870"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Nuclear bodies","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NELFE"},"hgnc":{"alias_symbol":["RD","D6S45","NELF-E","RDP"],"prev_symbol":["RDBP"]},"alphafold":{"accession":"P18615","domains":[{"cath_id":"3.30.70.330","chopping":"262-331","consensus_level":"high","plddt":88.4074,"start":262,"end":331},{"cath_id":"1.20.5","chopping":"206-235","consensus_level":"medium","plddt":59.3487,"start":206,"end":235}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P18615","model_url":"https://alphafold.ebi.ac.uk/files/AF-P18615-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P18615-F1-predicted_aligned_error_v6.png","plddt_mean":63.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NELFE","jax_strain_url":"https://www.jax.org/strain/search?query=NELFE"},"sequence":{"accession":"P18615","fasta_url":"https://rest.uniprot.org/uniprotkb/P18615.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P18615/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P18615"}},"corpus_meta":[{"pmid":"10980155","id":"PMC_10980155","title":"RDP: 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\"finding\": \"The RRM (RNA Recognition Motif) of NELF-E adopts a βαββαβ fold in solution and directly binds HIV-1 TAR RNA with Kd values in the low-micromolar range, demonstrated using NMR structure determination and fluorescence equilibrium titrations with fluorescently labeled single-stranded and double-stranded oligoribonucleotides.\",\n      \"method\": \"NMR solution structure determination; fluorescence equilibrium titration with fluorescently labeled RNA oligonucleotides\",\n      \"journal\": \"The Biochemical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional RNA-binding validation using quantitative biochemistry in a single rigorous study\",\n      \"pmids\": [\"16898873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RNA binding to NELF-E RRM induces a major conformational change: the C-terminal region, which is unstructured in the free protein, forms an α-helix upon TAR RNA binding, and large chemical shift perturbations also occur in the loop between β3 and α2, regions distant from the canonical RRM binding interface. The RNA-bound NELF-E RRM structure closely resembles RNA-bound U1A RRM.\",\n      \"method\": \"NMR spectroscopy (chemical shift perturbation mapping); solution structure determination of RNA-bound NELF-E RRM\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR solution structure of RNA-bound form with conformational change mapped at residue resolution, single lab but multiple orthogonal NMR methods\",\n      \"pmids\": [\"18303858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NELF-E contains an RRM that recognizes a specific consensus RNA element (NBE: CUGAGGA(U) for Drosophila NELF-E) identified by in vitro SELEX. An NBE-like element is present in the loop region of HIV-1 TAR RNA and is required for high-affinity binding. NBE sequences are enriched +20 to +30 nucleotides downstream of transcription start sites genome-wide in paused genes, supporting a role for NELF-E RNA binding in promoter-proximal Pol II pausing.\",\n      \"method\": \"In vitro SELEX (systematic evolution of ligands by exponential enrichment); quantitative binding assays; genome-wide bioinformatic analysis of NBE distribution; nuclear run-on SELEX\",\n      \"journal\": \"PLoS Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution (SELEX + quantitative biochemistry) combined with genome-wide functional validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"24453987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NELF-E (and NELF-A) are rapidly recruited to DNA double-strand break (DSB) sites in a PARP1-dependent manner, preferentially at DSBs upstream of transcriptionally active genes where RNA Pol II is present. NELF-E recruitment and its repressive activity are required to switch off transcription at DSBs, and NELF-E is required for intact DSB repair.\",\n      \"method\": \"I-SceI endonuclease and CRISPR-Cas9 DSB induction systems; live-cell recruitment assays (imaging); PARP1 inhibition epistasis; RNA Pol II ChIP/depletion; loss-of-function (knockdown) with transcription and repair readouts\",\n      \"journal\": \"EMBO Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal DSB induction systems, PARP1 epistasis, Pol II requirement established, functional phenotypes for transcription repression and repair, single lab with rigorous controls\",\n      \"pmids\": [\"28336775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The C-terminal peptide of NELF-E binds directly to the nuclear cap-binding complex (CBC) in a manner that is enhanced when CBC is bound to a cap analogue. The NELF-E C-terminal peptide and the homologous C-terminal peptide of ARS2 bind identically to CBC, forming mutually exclusive complexes. NELF-E binding to CBC is incompatible with PHAX binding, defining two mutually exclusive complexes: CBC-NELF-E and CBC-ARS2-PHAX.\",\n      \"method\": \"Crystal structure determination; biochemical binding assays; co-crystallization with cap analogue; competition binding experiments\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of CBC-NELF-E complex with functional validation by competition binding and cap-analogue enhancement, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"29101316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Oncogenic activation of NELFE via somatic copy-number alterations enhances MYC signaling and promotes hepatocellular carcinoma (HCC) progression. NELFE selectively regulates MYC-associated genes, inducing a unique tumor transcriptome.\",\n      \"method\": \"Analysis of 1,225 clinical HCC samples; somatic copy-number alteration analysis; functional studies in HCC cells; transcriptomic analysis of NELFE-regulated genes\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — large clinical cohort combined with functional cell-based experiments linking NELFE copy number to MYC target gene regulation, single lab\",\n      \"pmids\": [\"28697339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NELFE promotes pancreatic cancer metastasis and epithelial-to-mesenchymal transition (EMT) by decreasing the mRNA stability of NDRG2, thereby activating the Wnt/β-catenin signaling pathway. NELFE directly binds the NDRG2 mRNA as shown by RNA immunoprecipitation.\",\n      \"method\": \"shRNA knockdown; mRNA decay assays; RNA immunoprecipitation (RIP); luciferase reporter assays; transwell invasion/migration assays; western blotting for β-catenin pathway components\",\n      \"journal\": \"International Journal of Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP demonstrates direct NELFE-NDRG2 mRNA interaction; mRNA decay assays show mechanistic regulation; multiple functional readouts, single lab\",\n      \"pmids\": [\"31638184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NELFE promotes gastric cancer growth and metastasis by binding the 3'UTR of E2F2 mRNA and increasing E2F2 mRNA stability. Overexpression of E2F2 rescues the proliferation and migration defects caused by NELFE knockdown, placing NELFE upstream of E2F2.\",\n      \"method\": \"shRNA knockdown; RNA binding to 3'UTR (RIP implied); mRNA stability assays; rescue experiments with E2F2 overexpression; xenograft in vivo experiments; transwell assays\",\n      \"journal\": \"Frontiers in Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by rescue experiment places NELFE upstream of E2F2; mRNA stability mechanistically linked to 3'UTR binding; single lab\",\n      \"pmids\": [\"34295816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NELFE activates CSNK2B expression through the Wnt/β-catenin signaling pathway in gastric cancer. Gain- and loss-of-function experiments demonstrated that NELFE potentiates gastric cancer cell proliferation and metastasis in vitro and in vivo, with CSNK2B identified as a downstream effector using a 10-pathway reporter array and dual-luciferase reporter assays.\",\n      \"method\": \"Gain- and loss-of-function (siRNA/overexpression); Cignal Finder 10-Pathway Reporter Array; dual-luciferase reporter assays; CCK-8, colony formation, transwell assays; nude mouse xenograft model; IHC on consecutive sections\",\n      \"journal\": \"Journal of Experimental & Clinical Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway array plus luciferase reporter validation identifies signaling axis; functional rescue with multiple assays; single lab\",\n      \"pmids\": [\"33526068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NELF-E co-opts the EMT transcription factor SLUG as a chromatin partner during breast cancer EMT, and NELF-E loss impairs SLUG binding on chromatin. The histone acetyltransferase KAT2B is identified as a key functional downstream target of the NELF-E–SLUG axis, with KAT2B regulating EMT marker expression. NELF complex inhibition downregulates EMT and stemness-associated genes.\",\n      \"method\": \"Quantitative multiplexed Rapid Immunoprecipitation Mass spectrometry of Endogenous proteins (qPLEX-RIME); ChIP assays for SLUG binding; loss-of-function (NELF-E knockdown/knockout); genetic and pharmacological KAT2B inactivation; integrative transcriptomics and genomics; cancer cell lines and patient-derived tumor organoids\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — qPLEX-RIME identifies NELF-E chromatin partners; ChIP demonstrates SLUG dependency; pharmacological and genetic KAT2B inactivation phenocopies NELF ablation; multiple orthogonal methods across cell lines and organoids\",\n      \"pmids\": [\"37117180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Drosophila, NELF-E mRNA is a top interactor of the cap-binding protein 4EHP. Knockdown of NELF-E reduces multiple subunits of the 40S ribosome (RpS) and eIF3 translation initiation factor subunits, and NELF-E knockdown suppresses ATF4 expression and its target genes, placing NELF-E in an ATF4 regulatory network with 4EHP, 40S ribosome, and eIF3.\",\n      \"method\": \"TRIBE (Targets of RNA Binding through Editing) screen to identify 4EHP-NELF-E mRNA interaction; quantitative proteomics after NELF-E knockdown; genetic epistasis (knockdown of NELF-E, 4EHP, RpS12, eIF3l, eIF3h with ATF4 reporter readout); Drosophila larval fat body in vivo model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TRIBE screen identifies 4EHP-NELF-E mRNA interaction; quantitative proteomics + genetic epistasis; in vivo Drosophila model; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"41436469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NELFE undergoes liquid-liquid phase separation (LLPS) mediated by two low-complexity sequences, forming distinct nuclear foci. NELFE phase-separates with SMARCB1 to modulate chromatin accessibility, downregulating pro-apoptotic genes through Pol II pausing while activating pro-growth signals, thereby promoting HCC progression.\",\n      \"method\": \"Phase separation assays (LLPS); identification of low-complexity sequences; co-IP/interaction studies with SMARCB1; ATAC-seq or equivalent chromatin accessibility assays; Pol II pausing analysis; loss-of-function with apoptotic and growth gene expression readouts\",\n      \"journal\": \"Research Square (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint; abstract-level description of LLPS and SMARCB1 interaction without full methodological detail; single lab, methods not fully specified in abstract\",\n      \"pmids\": [\"40313774\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"NELFE (NELF-E) is the RNA-binding subunit of the heterotetrameric Negative Elongation Factor (NELF) complex; its RRM adopts a βαββαβ fold that undergoes a conformational change upon RNA binding (forming a C-terminal helix), recognizes a consensus NBE sequence (CUGAGGA(U)) enriched near transcription start sites of paused genes, binds the CBC via its C-terminal peptide in a mutually exclusive manner with ARS2/PHAX, is recruited to DNA double-strand breaks in a PARP1- and RNA Pol II-dependent manner to repress transcription and facilitate repair, and acts oncogenically in multiple cancers by stabilizing or destabilizing target mRNAs (e.g., E2F2, NDRG2), co-opting the EMT transcription factor SLUG to regulate KAT2B-dependent chromatin changes, and potentially forming phase-separated condensates with SMARCB1 to modulate chromatin accessibility and Pol II pausing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NELFE is the RNA-binding subunit of the Negative Elongation Factor complex that couples nascent transcript recognition to promoter-proximal RNA Polymerase II pausing [#2]. Its RNA Recognition Motif adopts a βαββαβ fold and binds RNA directly, undergoing a conformational change in which its C-terminal region folds into an α-helix upon engaging RNA [#0, #1]; through this RRM it recognizes a defined consensus element (NBE, CUGAGGA(U)) that is enriched 20–30 nucleotides downstream of transcription start sites at paused genes, linking sequence-specific RNA binding to the pausing function [#2]. A C-terminal peptide of NELFE binds the nuclear cap-binding complex in a manner mutually exclusive with ARS2/PHAX, defining a distinct CBC–NELFE complex at capped nascent transcripts [#4]. Beyond steady-state transcription, NELFE is recruited to DNA double-strand breaks in a PARP1- and Pol II-dependent manner to shut off local transcription and enable repair [#3]. NELFE also acts oncogenically across multiple cancers, both by post-transcriptionally tuning target mRNA stability—destabilizing NDRG2 to activate Wnt/β-catenin signaling and EMT in pancreatic cancer [#6] and stabilizing E2F2 via its 3'UTR in gastric cancer [#7]—and by co-opting the EMT transcription factor SLUG as a chromatin partner to drive a KAT2B-dependent transcriptional program [#9]. In hepatocellular carcinoma, NELFE amplification enhances MYC signaling and reprograms the tumor transcriptome [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that NELFE's RRM is a bona fide RNA-binding module by determining its fold and demonstrating direct, quantifiable binding to a viral RNA element.\",\n      \"evidence\": \"NMR solution structure and fluorescence equilibrium titrations with labeled RNA oligonucleotides (HIV-1 TAR)\",\n      \"pmids\": [\"16898873\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define a physiological cellular RNA target\", \"Binding measured only against TAR RNA in vitro\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed the structural mechanism of RNA recognition, showing that RNA binding drives a major conformational change including formation of a C-terminal helix.\",\n      \"evidence\": \"NMR chemical-shift perturbation mapping and solution structure of the RNA-bound RRM\",\n      \"pmids\": [\"18303858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of the conformational change in vivo not tested\", \"Studied as isolated RRM, not within the NELF complex\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected NELFE's RNA-binding specificity to its biological role by identifying a consensus element enriched at paused promoters genome-wide.\",\n      \"evidence\": \"In vitro SELEX, quantitative binding assays, and genome-wide bioinformatic analysis of NBE distribution\",\n      \"pmids\": [\"24453987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration that NBE engagement controls pausing at endogenous genes not shown\", \"Consensus defined for Drosophila NELF-E\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended NELFE function beyond steady-state transcription, showing it represses transcription at DNA double-strand breaks to facilitate repair.\",\n      \"evidence\": \"I-SceI and CRISPR DSB induction, live-cell recruitment imaging, PARP1 inhibition epistasis, and Pol II depletion with repair readouts\",\n      \"pmids\": [\"28336775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of PARP1-dependent recruitment unresolved\", \"Whether RRM RNA binding is required at DSBs not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a structural interface linking NELFE to cap-bound transcripts, showing it binds the cap-binding complex mutually exclusively with ARS2/PHAX.\",\n      \"evidence\": \"Crystal structure of CBC–NELFE, cap-analogue co-crystallization, and competition binding\",\n      \"pmids\": [\"29101316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional outcome of CBC–NELFE versus CBC–ARS2–PHAX partitioning in cells not determined\", \"Cap-dependent vs RRM-dependent recruitment not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Implicated NELFE as an oncogenic driver, showing copy-number-driven activation enhances MYC signaling in hepatocellular carcinoma.\",\n      \"evidence\": \"Analysis of 1,225 clinical HCC samples, somatic copy-number analysis, and functional transcriptomic studies in HCC cells\",\n      \"pmids\": [\"28697339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which NELFE selects MYC-associated genes not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified a post-transcriptional oncogenic mechanism in which NELFE destabilizes NDRG2 mRNA to activate Wnt/β-catenin signaling and EMT.\",\n      \"evidence\": \"shRNA knockdown, mRNA decay assays, RIP, luciferase reporters, and invasion assays in pancreatic cancer\",\n      \"pmids\": [\"31638184\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RNA element on NDRG2 bound by NELFE not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed NELFE can also stabilize target mRNAs, binding the E2F2 3'UTR to promote gastric cancer growth, with E2F2 placed downstream by rescue.\",\n      \"evidence\": \"shRNA knockdown, mRNA stability assays, E2F2 overexpression rescue, and xenograft experiments\",\n      \"pmids\": [\"34295816\", \"33526068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How NELFE switches between stabilizing and destabilizing outcomes unknown\", \"Direct vs indirect 3'UTR binding not fully resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected NELFE to a chromatin-level oncogenic program, showing it partners with SLUG and drives KAT2B-dependent EMT gene expression.\",\n      \"evidence\": \"qPLEX-RIME chromatin interactomics, SLUG ChIP, NELFE loss-of-function, and genetic/pharmacological KAT2B inactivation in cell lines and organoids\",\n      \"pmids\": [\"37117180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SLUG recruitment depends on NELFE's RRM or NELF complex integrity not dissected\", \"Relationship to pausing function unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed NELFE in a translation-initiation regulatory network, with its mRNA as a 4EHP interactor and its loss affecting 40S/eIF3 levels and ATF4 output.\",\n      \"evidence\": \"TRIBE screen, quantitative proteomics, and genetic epistasis with ATF4 reporter in Drosophila fat body\",\n      \"pmids\": [\"41436469\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting NELF-E to ribosome subunit levels unknown\", \"Conservation in mammals not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed that NELFE phase-separates with SMARCB1 to remodel chromatin accessibility and Pol II pausing in HCC.\",\n      \"evidence\": \"LLPS assays, low-complexity sequence mapping, SMARCB1 interaction studies, and chromatin accessibility/Pol II pausing readouts (preprint)\",\n      \"pmids\": [\"40313774\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint; methods not fully specified and not independently confirmed\", \"Physiological role of condensates versus complex-based pausing unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NELFE's well-defined RRM/NBE pausing function mechanistically integrates with its diverse cytoplasmic and oncogenic mRNA-stability and chromatin-partner roles remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking sequence-specific RNA binding to mRNA stability control\", \"Whether mRNA-stability functions occur within or outside the NELF complex is unknown\", \"Structural basis of target mRNA selection in cancers not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 2, 6, 7]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 3, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 9, 11]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 3, 9]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 6, 7, 9]}\n    ],\n    \"complexes\": [\"NELF complex\", \"CBC-NELFE complex\"],\n    \"partners\": [\"NCBP1\", \"ARS2\", \"SLUG\", \"SMARCB1\", \"PARP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}