{"gene":"NSMF","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1999,"finding":"NELF (negative elongation factor) is a multisubunit complex that cooperates with DSIF to strongly repress RNA polymerase II elongation; this repression is reversed by P-TEFb-dependent phosphorylation of the Pol II C-terminal domain. The smallest subunit of NELF is identical to RD, a putative RNA-binding protein.","method":"Purification from HeLa nuclear extract, in vitro transcription elongation assays with DRB, biochemical reconstitution","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — purification and in vitro reconstitution of activity, replicated across multiple subsequent studies","pmids":["10199401"],"is_preprint":false},{"year":2003,"finding":"NELF contains five polypeptides (A–E): NELF-A has similarity to hepatitis delta antigen and is critical for RNAPII binding and transcriptional pausing; NELF-B is identical to COBRA1 (a BRCA1-associated protein); NELF-C and NELF-D are related to TH1; NELF-B and NELF-C/D are integral subunits that bring NELF-A and NELF-E together. Coexpression of all four proteins in insect cells reconstitutes functionally active NELF. The HDAg-homology region of NELF-A is critical for RNAPII binding.","method":"Subunit identification, recombinant coexpression in insect cells, in vitro transcription assays with mutant complexes","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution of active complex plus mutagenesis defining critical regions, single lab but multiple orthogonal methods","pmids":["12612062"],"is_preprint":false},{"year":2003,"finding":"NELF and DSIF cause promoter-proximal pausing of RNA Pol II on the Drosophila hsp70 gene. Immunodepletion of NELF from Drosophila nuclear extract reduced paused polymerase levels. In vivo cross-linking showed NELF and DSIF associate with the hsp70 promoter region before heat shock. After heat shock induction, DSIF and Pol II but not NELF were recruited to chromosomal puffs at hsp70 genes, suggesting NELF dissociates upon activation.","method":"Immunodepletion from nuclear extract, RNA interference in salivary glands, in vivo protein-DNA cross-linking (ChIP), immunofluorescence on polytene chromosomes","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo and in vitro methods, replicated in subsequent studies","pmids":["12782658"],"is_preprint":false},{"year":2000,"finding":"DSIF and NELF associate with the RNA Pol II elongation complex during early transcription elongation and travel with elongation complexes as nascent RNA is synthesized. HIV-1 Tat stimulates P-TEFb-mediated phosphorylation of DSIF and RNA Pol II during elongation to overcome NELF/DSIF repression.","method":"Stepwise RNA Pol II walking approach, Western blotting, in vitro kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted elongation complex walking assay plus kinase assay, single lab","pmids":["11112772"],"is_preprint":false},{"year":2000,"finding":"FACT functions with P-TEFb to relieve DSIF/NELF-mediated transcriptional repression. TFIIH kinase activity is dispensable for this relief, demonstrating that TFIIH-mediated CTD phosphorylation is not involved in regulating FACT and DSIF/NELF activities. FACT acts on naked DNA templates independently of its chromatin activities.","method":"In vitro transcription elongation assay with purified factors, kinase inhibition experiments","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components and genetic dissection of kinase requirements, single lab","pmids":["10912001"],"is_preprint":false},{"year":2005,"finding":"Drosophila NELF has four subunits analogous to human NELF subunits. Immunodepletion of NELF from Drosophila nuclear extract impairs promoter-proximal pausing on the hsp70 promoter without affecting transcription initiation. ChIP detects NELF at hsp70 and beta1-tubulin promoters; heat shock induction causes marked decrease of NELF at the hsp70 promoter.","method":"Immunodepletion, in vitro transcription, chromatin immunoprecipitation (ChIP), immunofluorescence on polytene chromosomes","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, immunodepletion, in vitro transcription), single lab","pmids":["15741180"],"is_preprint":false},{"year":2006,"finding":"NELF-E RRM adopts a betaalphabetabetaalphabeta fold and binds to HIV TAR RNA. NMR solution structure of the RRM was determined. The RRM binds single-stranded TAR RNA oligoribonucleotides with Kd values in the low-micromolar range.","method":"NMR solution structure determination, fluorescence equilibrium titration binding assays","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure plus quantitative binding measurements, single lab","pmids":["16898873"],"is_preprint":false},{"year":2006,"finding":"NELF-mediated transcriptional pausing has a dual role at the human junB gene: before IL-6 induction, RNAPII, DSIF, and NELF accumulate at ~+50 from TSS; after induction, depletion of NELF enhances junB mRNA both before and after induction, indicating NELF-mediated pausing contributes to negative regulation at both stages.","method":"Chromatin immunoprecipitation, RNA interference (siRNA knockdown), RT-PCR","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus RNAi knockdown with mRNA quantification, single lab","pmids":["16880520"],"is_preprint":false},{"year":2007,"finding":"NELF interacts with the nuclear cap-binding complex (CBC) and together they participate in 3'-end processing of replication-dependent histone mRNAs through association with SLBP. Absence of NELF and CBC causes aberrant production of polyadenylated histone mRNAs. NELF is physically associated with histone gene loci and forms distinct intranuclear foci (NELF bodies) that overlap with Cajal bodies and cleavage bodies.","method":"Co-immunoprecipitation, RNA interference, RT-PCR, chromatin immunoprecipitation, immunofluorescence microscopy","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ChIP, knockdown with defined molecular phenotype), replicated for multiple NELF subunits","pmids":["17499042"],"is_preprint":false},{"year":2007,"finding":"NELF is associated with the HIV LTR and pauses RNA Pol II at the LTR in a repressed state. NELF depletion increased processive HIV transcription and replication, released paused Pol II, displaced a positioned nucleosome, and increased histone H4 acetylation, linking transcription elongation to chromatin remodeling.","method":"Chromatin immunoprecipitation, NELF depletion (RNAi), Pol II mapping on LTR, nucleosome positioning analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP, Pol II mapping, and RNAi with multiple molecular readouts, single lab","pmids":["17442680"],"is_preprint":false},{"year":2008,"finding":"NELF-E RRM undergoes major conformational changes upon RNA binding: the flexible C-terminal region and loop between beta3 and alpha2 show large chemical shift perturbations. RNA binding induces formation of a helix in the C-terminus, resulting in an RNA-bound structure similar to U1A RRM.","method":"NMR solution structure of RNA-bound NELF-E RRM, chemical shift perturbation analysis","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure determination with bound RNA, single lab","pmids":["18303858"],"is_preprint":false},{"year":2008,"finding":"NELF is concentrated at the 5' ends of ~2,111 genes genome-wide in Drosophila cells (ChIP-chip), and 46 of 56 tested NELF-associated genes display paused Pol II 30–50 nt downstream of TSS. NELF associates with ~39% of GAGA factor-bound genes. NELF associates with ~half of the most highly expressed genes, indicating it is not necessarily a repressor.","method":"ChIP-chip (genome-wide location analysis), permanganate genomic footprinting for paused Pol II detection","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-chip combined with permanganate footprinting, large-scale dataset","pmids":["18332113"],"is_preprint":false},{"year":2009,"finding":"NELF-E is predominantly nuclear in GnRH neurons. Mutagenesis of a putative nuclear localization signal results in impaired nuclear expression. NELF knockdown impairs GnRH neuronal migration of NLT cells in vitro.","method":"Immunofluorescence, NLS mutagenesis, siRNA knockdown with migration assay","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — NLS mutagenesis and knockdown migration assay, single lab, limited mechanistic depth","pmids":["20025934"],"is_preprint":false},{"year":2009,"finding":"NELF subunits exhibit distinct subcellular localizations including NELF bodies and midbodies; some subunits shuttle actively between nucleus and cytoplasm. Loss of NELF from cells leads to enlarged and/or multiple nuclei.","method":"Live imaging of GFP-fusion proteins, FRAP, subcellular fractionation, fluorescence microscopy","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with FRAP and multiple localization methods, single lab","pmids":["19245807"],"is_preprint":false},{"year":2010,"finding":"DSIF and NELF require a nascent transcript longer than 18 nt to stably associate with the Pol II elongation complex. Spt5 (DSIF) contacts nascent RNA as it emerges from the elongation complex via protein-RNA cross-linking, suggesting DSIF binds via the nascent transcript and subsequently recruits NELF. No NELF-RNA contact was detected when the nascent transcript was between 22–31 nt (the pausing region), suggesting RNA binding by NELF is not required for promoter-proximal pausing.","method":"Reconstituted Drosophila Pol II elongation complex, protein-RNA cross-linking, DSIF/NELF binding assays with defined RNA lengths","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined RNA lengths and cross-linking, single lab with multiple orthogonal approaches","pmids":["20534440"],"is_preprint":false},{"year":2013,"finding":"The timing between NELF loading onto Pol II and Pol II escape from the promoter determines the location of the promoter-proximal pause. GAF (sequence-specific transcription factor) orchestrates efficient pausing by recruiting NELF to promoters before transcription initiation and by assisting in loading NELF onto Pol II after initiation.","method":"Permanganate-ChIP-seq (genome-wide), biochemical reconstitution system for promoter-proximal pausing","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution plus genome-wide permanganate-ChIP-seq, single lab with two orthogonal approaches","pmids":["23746353"],"is_preprint":false},{"year":2013,"finding":"NELF interacts with the Integrator complex subunits (INTScom) in an RNA- and DNA-independent manner. Integrator subunits control NELF-mediated RNAPII pause/release at coding genes; INTS11 catalytic subunit is required for RNAPII processivity. NELF-target genes are enriched in TAR/NBE-like elements and 3'-box sequences.","method":"Co-immunoprecipitation, siRNA knockdown, ChIP, nascent RNA analysis, genome-wide studies","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus genome-wide ChIP and knockdown with defined molecular phenotypes, single lab","pmids":["25410209"],"is_preprint":false},{"year":2013,"finding":"NELF interacts with Pcf11 (a transcription termination factor) to couple RNAP II pausing to premature transcription termination at the HIV LTR. NELF also interacts with the corepressor complex NCoR1-GPS2-HDAC3, which is associated with repressed HIV LTRs. Depleting NELF or Pcf11 in primary CD4+ T cells induces HIV transcription elongation.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown in primary T cells, HIV transcription assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP and functional knockdown, single lab","pmids":["23884411"],"is_preprint":false},{"year":2013,"finding":"BRD4 coordinates recruitment of both the pause release factor P-TEFb and the pausing complex NELF/DSIF to IFN-stimulated genes. A BRD4 small-molecule inhibitor blocks IFN-induced recruitment of P-TEFb and NELF/DSIF. NELF knockdown revealed it negatively regulates Pol II passage across ISGs during elongation.","method":"ChIP, shRNA knockdown, small-molecule BRD4 inhibitor treatment","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and knockdown with defined molecular phenotypes, single lab","pmids":["23589332"],"is_preprint":false},{"year":2014,"finding":"NELF-E contains an RNA Recognition Motif (RRM) that binds a consensus NELF-E binding element (NBE: CUGAGGA(U) for Drosophila). An NBE-like element is present in the loop of HIV-1 TAR RNA and is required for high-affinity binding (not the lower stem as previously claimed). NBEs are enriched +20 to +30 nt downstream of TSS genome-wide in paused genes.","method":"In vitro SELEX, quantitative biochemical binding assays, genome-wide NBE analysis in Drosophila","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro SELEX plus quantitative binding and genome-wide analysis, single lab with multiple orthogonal methods","pmids":["24453987"],"is_preprint":false},{"year":2014,"finding":"eRNAs interact with the NELF complex and facilitate transient release of NELF from specific target promoters (immediate early genes) during transcriptional activation in neurons. Knockdown of enhancer-specific eRNAs impairs NELF release from promoters and decreases target mRNA induction. Enhancer-promoter chromatin looping enables local eRNA action.","method":"RNA immunoprecipitation, eRNA knockdown (siRNA), ChIP, chromatin conformation capture","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RNA-IP plus ChIP and knockdown with specific molecular phenotype, single lab","pmids":["25263592"],"is_preprint":false},{"year":2014,"finding":"DSIF and NELF associate with Integrator to specify the correct post-transcriptional fate of snRNA genes. Knockdown of NELF results in misprocessing of U1, U2, U4, and U5 snRNAs, disruption of transcription termination, and induction of polyadenylated U1 transcripts via enhanced recruitment of cleavage stimulation factor. DSIF is required for proper transcription of these snRNA genes.","method":"Co-immunoprecipitation, RNA interference (siRNA), ChIP, RT-PCR for snRNA processing","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ChIP, and knockdown with multiple molecular phenotypes replicated across multiple snRNA genes","pmids":["24968874"],"is_preprint":false},{"year":2017,"finding":"The C-terminal peptides of NELF-E and ARS2 bind identically to the nuclear cap-binding complex (CBC), and affinity is enhanced when CBC is bound to a cap analogue. NELF-E and ARS2 compete for the same CBC binding site, forming mutually exclusive complexes: CBC-NELF-E (likely earlier transcription phase) and CBC-ARS2-PHAX (later phase). NELF-E binding to CBC is incompatible with PHAX binding.","method":"Biochemical binding assays, crystal structure determination of CBC-NELF-E peptide complex","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus biochemical competition assays, single lab with multiple orthogonal methods","pmids":["29101316"],"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. NELF-E is preferentially recruited to DSBs upstream of transcriptionally active genes; RNA Pol II presence is a prerequisite. NELF-E recruitment and its repressive activity are required for switching off transcription at DSBs and for intact repair of DSBs.","method":"I-SceI endonuclease and CRISPR-Cas9 DSB systems, ChIP, live imaging, transcription and repair assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple DSB systems, ChIP, and functional repair assays, single lab","pmids":["28336775"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structure of the paused transcription elongation complex (Pol II-DSIF-NELF) at 3.2 Å. NELF binds the polymerase funnel, bridges two mobile polymerase modules, and contacts the trigger loop, restraining Pol II mobility required for pause release. NELF prevents TFIIS binding. NELF has two flexible 'tentacles' that can contact DSIF and exiting RNA. The paused complex features a tilted DNA-RNA hybrid that impairs NTP substrate binding.","method":"Cryo-electron microscopy structure determination at 3.2 Å, structural analysis of complex interfaces","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structure with detailed mechanistic interpretation, widely replicated and cited","pmids":["30135580"],"is_preprint":false},{"year":2020,"finding":"Upon rapid NELF depletion, RNA Pol II fails to be released into gene bodies, stalling instead around the +1 nucleosomal dyad-associated region in a manner independent of P-TEFb. NELF depletion results in global loss of cap-binding complex (CBC) from chromatin without global reduction of nascent transcript 5' cap stability, implicating NELF in early elongation complexes distinct from canonical pause-release.","method":"Auxin-inducible degron (rapid NELF depletion), PRO-seq, ChIP-seq","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — rapid protein depletion combined with multiple orthogonal genomic assays, single lab","pmids":["32155413"],"is_preprint":false},{"year":2021,"finding":"NELF rapidly forms nuclear condensates upon stress (heat, oxidative, osmotic stress) in human cells. Condensate formation requires NELF dephosphorylation and SUMOylation induced by stress. The intrinsically disordered region (IDR) in NELFA is necessary for nuclear NELF condensation and can be functionally replaced by IDRs of FUS or EWSR1. Biomolecular condensation facilitates enhanced recruitment of NELF to promoters upon stress to drive transcriptional downregulation. NELF condensation is required for cellular viability under stressful conditions.","method":"Live cell imaging, FRAP, SUMOylation assays, dephosphorylation assays, IDR domain swap experiments, ChIP upon stress","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, FRAP, PTM analysis, domain swaps, ChIP), replicated across stress conditions","pmids":["33548202"],"is_preprint":false},{"year":2021,"finding":"NSMF (Jacob/NSMF protein) localizes rapidly to stalled replication forks and acts as a scaffold to modulate RPA complex formation with CDC5L and ATR/ATRIP. Depletion of NSMF compromises phosphorylation and ubiquitination of RPA2 and the ATR signaling cascade, resulting in genomic instability. NSMF knockout mice exhibited increased genomic instability and hypersensitivity to genotoxic stress.","method":"Co-immunoprecipitation, immunofluorescence at stalled forks, siRNA knockdown, NSMF knockout mice, ATR signaling assays (phosphorylation, ubiquitination)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, knockout mouse model, and multiple biochemical pathway assays, single lab","pmids":["33963872"],"is_preprint":false},{"year":2022,"finding":"eRNAs stimulate Pol II pause release by making multiple allosteric contacts with NELF subunits -A and -E to trigger efficient NELF detachment from paused Pol II. eRNA function requires length >200 nucleotides and unpaired guanosines; it does not require common structural or sequence motifs.","method":"In vitro NELF-eRNA binding assays, cross-linking mass spectrometry, eRNA length/structure mutants, pause release functional assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutant eRNAs plus cross-linking MS identifying specific contacts, single lab","pmids":["35508485"],"is_preprint":false},{"year":2022,"finding":"ERK phosphorylates NELF-A upon growth factor stimulation, causing dissociation of NELF from paused Pol II at promoter-proximal regions of immediate-early genes to allow productive elongation. PP2A efficiently dephosphorylates NELF-A, preventing aberrant IEG expression. In cancer cells, decreased PP2A activity combined with oncogene-mediated ERK activation induces NELF-A phosphorylation and IEG upregulation.","method":"In vitro kinase assay (ERK→NELF-A), phosphorylation site identification (MS), ChIP, growth factor stimulation experiments, PP2A inhibitor treatment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay identifying substrate plus ChIP and cell-based validation, single lab with multiple orthogonal methods","pmids":["36463234"],"is_preprint":false},{"year":2023,"finding":"NSMF physically interacts with RPA at DNA damage sites. NSMF selectively displaces RPA in weakly bound 8- and 20-nucleotide binding modes from ssDNA, allowing retention of stable RPA molecules in the 30-nt binding mode. The 30-nt binding mode of RPA enhances RPA32 phosphorylation by ATR, and phosphorylated RPA becomes stabilized on ssDNA.","method":"Co-immunoprecipitation, single-molecule DNA binding assays, purified protein biochemical assays, RPA binding mode analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro single-molecule assays plus Co-IP, defining a precise biophysical mechanism, single lab","pmids":["37378431"],"is_preprint":false},{"year":2023,"finding":"NELF-depleted Drosophila cells recapitulate NELF-independent pausing observed in fission yeast. Only NELF-mediated pausing establishes a strict requirement for Cdk9 kinase activity for Pol II pause release into productive elongation. In NELF-depleted cells, Cdk9 inhibition fails to shut down transcription efficiently, allowing non-productive transcription to continue.","method":"NELF depletion in Drosophila cells, Cdk9 inhibition, PRO-seq, genetic epistasis analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistasis analysis combining NELF depletion and Cdk9 inhibition with nascent RNA sequencing, single lab","pmids":["37179384"],"is_preprint":false},{"year":2023,"finding":"Crystal structure of the human NELF-B/C/E ternary complex was solved at high resolution. Detailed interaction interfaces between subunits were characterized, and residues important for the NELF-B and NELF-E association were identified.","method":"X-ray crystallography","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Weak — high-resolution crystal structure, single lab, no functional mutagenesis follow-up described in abstract","pmids":["37591184"],"is_preprint":false},{"year":2024,"finding":"NELF depletion increased utilization of downstream transcription start sites and caused genome-wide loss of H3K4me3-marked nucleosomes. NELF depletion had minimal effect on paused transcript levels and almost no effect on productive elongation control, redefining NELF as a factor that focuses initiation sites and maintains promoter chromatin architecture rather than primarily controlling pause-release.","method":"Auxin-inducible degradation of NELFB, PRO-seq (nascent RNA), DFF-ChIP (chromatin architecture)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — rapid protein depletion with two orthogonal genome-wide assays, single lab","pmids":["38197272"],"is_preprint":false},{"year":2016,"finding":"Jacob (encoded by the Nsmf gene) mediates BDNF-induced NMDAR-dependent nuclear translocation in early development. Nuclear import of Jacob results in increased phosphorylation of CREB and enhanced CREB-dependent Bdnf gene transcription. Nsmf knockout mice show reduced hippocampal Bdnf mRNA and protein, reduced pCREB, hippocampal dysplasia with fewer synapses, simplified dendrites, reduced LTP, and deficits in hippocampus-dependent learning. BDNF application rescues morphological deficits in Jacob-deficient hippocampal neurons.","method":"Nsmf knockout mouse generation, immunofluorescence for nuclear translocation, CREB phosphorylation assays, Bdnf mRNA/protein quantification, electrophysiology (LTP), BDNF rescue experiments","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — comprehensive knockout mouse phenotyping with multiple orthogonal molecular and electrophysiological methods plus BDNF rescue","pmids":["26977770"],"is_preprint":false},{"year":2020,"finding":"NELF-E interacts with BRCA1 and promotes BRCA1 recruitment to laser-microirradiated DSB sites. NELF-E deficiency reduces BRCA1 and RAD51 IRIF formation, impairs homology-directed repair (HDR) of chromosomal DSBs, and sensitizes HCC cells to PARP inhibition (synthetic lethality).","method":"Co-immunoprecipitation, laser microirradiation with live imaging, IRIF assays, CRISPR-Cas9 HDR assay, PARP inhibitor sensitivity assay","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, recruitment imaging, and functional HDR assays with PARP inhibitor synthetic lethality, single lab","pmids":["33248388"],"is_preprint":false},{"year":2012,"finding":"Haploinsufficiency of NELF-A (WHSC2) in Wolf-Hirschhorn syndrome patient cells contributes to: delayed progression from S-phase into M-phase, reduced DNA replication in asynchronous culture, and altered chromatin assembly (reduced histone-chromatin association, elevated soluble chaperone-bound histone H3, increased MNase sensitivity). Cells also show increased sensitivity to camptothecin-induced inhibition of DNA replication.","method":"Patient-derived cell lines with differing 4p deletions, cell cycle analysis, DNA replication assays, chromatin fractionation, MNase digestion, drug sensitivity assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cells with multiple assays, but haploinsufficiency context (not clean single-gene KO) and confounded by SLBP co-deletion","pmids":["22328085"],"is_preprint":false},{"year":2021,"finding":"NELF-A subunit interacts with the ecdysone receptor (EcR) in Drosophila and the NELF complex is recruited to promoters and enhancers of 20E-dependent genes. NELF depletion causes significant decrease in 20E-induced transcription, disruption of Pol II elongation complexes, and a considerable reduction in promoter-bound Spt5 (DSIF subunit), suggesting NELF stabilizes the Pol II-DSIF complex.","method":"Co-immunoprecipitation (NELF-A/EcR), ChIP at 20E-dependent promoters, NELF depletion with nascent RNA analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus ChIP, single lab, limited mechanistic depth in abstract","pmids":["33420323"],"is_preprint":false},{"year":2015,"finding":"CTCF knockdown abrogates RNAP II pausing at c-myc by affecting DSIF recruitment. CTCF knockdown causes a termination defect on U2 snRNA genes by affecting NELF recruitment. CTCF is also required for recruitment of P-TEFb, which phosphorylates NELF, DSIF, and Ser2 of RNAP II CTD.","method":"ChIP, CTCF siRNA knockdown, RNAP II pausing and termination assays","journal":"Transcription","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and knockdown experiments at defined loci, single lab","pmids":["26399478"],"is_preprint":false},{"year":2013,"finding":"NELF-A and NELF-B independently act as competitive decelerators at steps downstream of glucocorticoid receptor (GR) action to attenuate GR-mediated gene induction and reduce partial agonist activity. A conserved motif in NELF-A and NELF-B is required for full modulatory activity. ChIP assays show NELF-B diminishes GR recruitment to promoter regions of endogenous genes.","method":"Competition transcription assays, ChIP, stable NELF-B knockdown, domain mutagenesis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, knockdown, and mutagenesis identifying a required motif, single lab","pmids":["24097989"],"is_preprint":false},{"year":2024,"finding":"Acute loss of NELF-C globally redistributes termination factors and perturbs Pol II transcription termination independently of promoter-proximal Pol II pausing. This drives pervasive Pol II transcription into DNA replication initiation zones, causing transcription-replication conflict that blocks cell cycle transition into S phase.","method":"Auxin-dependent NELF-C degradation, nascent transcript sequencing (TT-seq/NET-seq), termination factor ChIP","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — rapid inducible protein depletion with multiple genomic assays and cell cycle phenotype, single lab","pmids":["41721097"],"is_preprint":false},{"year":2026,"finding":"NSMF deficiency impairs replication fork progression under stress conditions in colorectal cancer cells, resulting in DNA damage accumulation, growth arrest, and senescence. NSMF overexpression provides resistance to oncogene-induced replication stress, enabling cancer cells to evade senescence. In ApcMin/+ mice, Nsmf knockout selectively induces replication-dependent DNA damage in tumor tissues.","method":"NSMF knockout in ApcMin/+ mice, replication fork progression assays, DNA damage markers, senescence assays, NSMF overexpression experiments","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model plus cell-based functional assays, single lab","pmids":["41533586"],"is_preprint":false},{"year":2026,"finding":"HSPA1A and DNAJB1 regulate NELF condensate dynamics during heat shock recovery. DNAJB1 recognizes NELFA's tentacle domain and facilitates HSPA1A recruitment, preventing aberrant NELF aggregation and enabling timely condensate disassembly. Disruption of NELF condensate dynamics causes persistent NELFA phosphorylation, impaired chromatin association, destabilized Pol II pausing, and premature release of non-productive Pol II complexes.","method":"Nanobody-based proximity labeling (NbPro), Co-IP, live imaging, domain mapping, ChIP, nascent RNA analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — proximity labeling identifying chaperone interactors plus multiple functional validation approaches, single lab","pmids":["41653920"],"is_preprint":false}],"current_model":"NELF (also known as NSMF for the gene locus) encodes multiple functional proteins: the canonical NELF complex (comprising NELF-A/B/C/D/E subunits) is a metazoan-specific negative elongation factor that associates with the Pol II elongation complex via the nascent RNA (nascent RNA >18 nt required), binds the Pol II funnel and trigger loop to stabilize promoter-proximal paused Pol II (defined by cryo-EM structure), cooperates with DSIF to repress elongation in a manner reversed by P-TEFb-mediated CTD phosphorylation and ERK-mediated NELF-A phosphorylation; NELF also interacts with CBC/SLBP for histone mRNA 3'-end processing, with Integrator for snRNA processing and pause-release control, and forms stress-induced nuclear condensates (requiring NELF dephosphorylation and SUMOylation of the NELFA IDR) that drive transcriptional downregulation; additionally NELF-E is recruited to DNA double-strand breaks via PARP1 to repress transcription and facilitate BRCA1/RAD51-dependent homologous recombination repair; separately, the NSMF/Jacob protein (encoded by the same locus) functions as a synapto-nuclear messenger that transports NMDAR-derived signals to the nucleus to activate CREB and sustain BDNF signaling during hippocampal dendritogenesis, and also acts as a scaffold at stalled replication forks to modulate RPA binding modes on ssDNA and potentiate ATR-mediated RPA32 phosphorylation for the DNA replication stress response."},"narrative":{"mechanistic_narrative":"The NSMF locus encodes two functionally distinct proteins built on transcriptional and genome-protective roles. The dominant product is NELF-A, a subunit of the metazoan negative elongation factor (NELF) complex of five polypeptides (A–E) that, together with DSIF, represses RNA polymerase II elongation in a manner reversed by P-TEFb-mediated CTD phosphorylation [PMID:10199401, PMID:12612062]. NELF establishes promoter-proximal pausing of Pol II 30–50 nt downstream of transcription start sites genome-wide, requiring a nascent transcript longer than 18 nt and orchestrated recruitment by sequence-specific factors such as GAF [PMID:12782658, PMID:18332113, PMID:20534440, PMID:23746353]. Structurally, NELF binds the polymerase funnel and trigger loop to restrain Pol II mobility, exclude TFIIS, and stabilize a paused state with a tilted DNA-RNA hybrid that impairs NTP binding [PMID:30135580]. Pause release is triggered by enhancer RNAs that allosterically contact NELF-A and NELF-E to detach the complex, and by ERK-mediated NELF-A phosphorylation (counteracted by PP2A) at immediate-early genes [PMID:35508485, PMID:36463234]. Beyond canonical pausing, NELF couples to RNA processing machineries—the cap-binding complex and SLBP for histone mRNA 3'-end processing, and Integrator for snRNA processing and termination [PMID:17499042, PMID:24968874, PMID:25410209]—and recent rapid-depletion studies redefine NELF as a factor that focuses initiation sites, maintains promoter chromatin architecture, and controls termination to prevent transcription-replication conflicts [PMID:38197272, PMID:41721097]. Under stress, NELF forms nuclear condensates dependent on NELF-A dephosphorylation and SUMOylation of its intrinsically disordered region to drive transcriptional downregulation, with condensate dynamics regulated by the HSPA1A/DNAJB1 chaperone system [PMID:33548202, PMID:41653920]. In the DNA damage response, NELF-E is recruited to double-strand breaks via PARP1 to repress local transcription and promote BRCA1/RAD51-dependent homologous recombination [PMID:28336775, PMID:33248388]. Separately, the NSMF/Jacob protein from the same locus functions as a synapto-nuclear messenger transducing NMDAR/BDNF signals to activate CREB and sustain Bdnf transcription during hippocampal dendritogenesis [PMID:26977770], and acts as a scaffold at stalled replication forks that modulates RPA binding modes on ssDNA to potentiate ATR-mediated RPA32 phosphorylation and the replication stress response [PMID:33963872, PMID:37378431].","teleology":[{"year":1999,"claim":"Established that a multisubunit factor cooperates with DSIF to repress Pol II elongation, defining the existence of negative elongation control reversible by P-TEFb.","evidence":"Purification from HeLa nuclear extract with in vitro transcription elongation assays","pmids":["10199401"],"confidence":"High","gaps":["Subunit composition and individual subunit roles not yet resolved","Mechanism of Pol II contact unknown"]},{"year":2003,"claim":"Defined NELF as a five-subunit complex and assigned NELF-A as the critical Pol II-binding subunit, enabling functional reconstitution.","evidence":"Subunit identification, recombinant coexpression in insect cells, mutant in vitro transcription assays","pmids":["12612062"],"confidence":"High","gaps":["Structural basis of subunit assembly not determined","How NELF-A contacts Pol II at atomic level unresolved"]},{"year":2003,"claim":"Demonstrated in vivo that NELF drives promoter-proximal pausing at an inducible gene and dissociates upon activation, linking the factor to gene regulation.","evidence":"Immunodepletion, RNAi in salivary glands, ChIP and polytene immunofluorescence in Drosophila","pmids":["12782658","15741180"],"confidence":"High","gaps":["Signal triggering NELF dissociation not defined","Genome-wide scope of pausing not yet assessed"]},{"year":2008,"claim":"Showed NELF-mediated pausing is a genome-wide phenomenon affecting thousands of genes, including highly expressed ones, expanding NELF beyond a simple repressor.","evidence":"ChIP-chip and permanganate genomic footprinting in Drosophila","pmids":["18332113"],"confidence":"High","gaps":["Determinants of which genes are paused not fully defined","Functional consequence of pausing at active genes unclear"]},{"year":2010,"claim":"Resolved how NELF is loaded onto the elongation complex, showing DSIF binds nascent RNA >18 nt and recruits NELF, while NELF RNA binding is dispensable for pausing.","evidence":"Reconstituted Drosophila Pol II elongation complex with protein-RNA cross-linking and defined RNA lengths","pmids":["20534440","23746353"],"confidence":"High","gaps":["Role of NELF-E RNA binding in vivo remained ambiguous","Timing of loading relative to pause position needed structural context"]},{"year":2014,"claim":"Defined NELF-E's RNA-binding specificity (NBE consensus) and identified eRNAs as physiological ligands that release NELF during activation, connecting enhancers to pause control.","evidence":"SELEX, quantitative binding, genome-wide NBE analysis; RNA-IP, ChIP, and eRNA knockdown in neurons","pmids":["24453987","25263592"],"confidence":"High","gaps":["Structural basis of eRNA-induced NELF release not yet shown","Generality of eRNA mechanism across gene classes unclear"]},{"year":2007,"claim":"Extended NELF function beyond pausing to RNA processing, coupling it to CBC/SLBP for histone mRNA 3'-end formation and revealing NELF nuclear bodies.","evidence":"Co-IP, RNAi, ChIP, RT-PCR, immunofluorescence","pmids":["17499042"],"confidence":"High","gaps":["Mechanism linking pausing to processing not defined","Composition and function of NELF bodies unresolved"]},{"year":2014,"claim":"Established NELF/DSIF–Integrator coupling for correct snRNA processing and termination, broadening NELF's role to non-coding RNA fate.","evidence":"Co-IP, ChIP, RNAi with snRNA processing readouts; reciprocal Integrator interaction studies","pmids":["24968874","25410209"],"confidence":"High","gaps":["How NELF directs processing versus pausing not mechanistically separated","Catalytic interplay with INTS11 incompletely defined"]},{"year":2018,"claim":"Provided the atomic mechanism of pausing, showing NELF binds the polymerase funnel and trigger loop to restrain Pol II and exclude TFIIS.","evidence":"Cryo-EM structure of Pol II-DSIF-NELF at 3.2 Å","pmids":["30135580","37591184"],"confidence":"High","gaps":["Dynamics of pause-to-release transition not captured","Conformational basis of eRNA-triggered detachment unresolved"]},{"year":2022,"claim":"Identified ERK phosphorylation of NELF-A (opposed by PP2A) and allosteric eRNA contacts as triggers of NELF dissociation, linking signaling to pause release at immediate-early genes.","evidence":"In vitro kinase assays, MS site mapping, ChIP, PP2A inhibition; in vitro eRNA binding with cross-linking MS","pmids":["36463234","28336775","35508485"],"confidence":"High","gaps":["Integration of multiple release signals in vivo not resolved","Quantitative contribution of each pathway per gene unknown"]},{"year":2021,"claim":"Revealed stress-induced NELF condensation governed by dephosphorylation and NELF-A IDR SUMOylation as a mechanism for transcriptional downregulation and stress survival.","evidence":"Live imaging, FRAP, SUMOylation/dephosphorylation assays, IDR domain swaps, ChIP under stress","pmids":["33548202","41653920"],"confidence":"High","gaps":["Which target genes are silenced by condensates not fully mapped","How condensation alters Pol II engagement mechanistically incomplete"]},{"year":2020,"claim":"Connected NELF-E to genome maintenance through PARP1-dependent recruitment to DSBs, BRCA1 interaction, and promotion of homologous recombination.","evidence":"I-SceI/CRISPR DSB systems, laser microirradiation, Co-IP, IRIF and HDR assays, PARP inhibitor synthetic lethality","pmids":["28336775","33248388"],"confidence":"High","gaps":["Whether transcriptional repression and HR promotion are separable not resolved","Mechanism of BRCA1 recruitment by NELF-E undefined"]},{"year":2016,"claim":"Defined the distinct NSMF/Jacob protein as a synapto-nuclear messenger transducing NMDAR/BDNF signals to CREB to sustain Bdnf transcription and dendritogenesis.","evidence":"Nsmf knockout mice, nuclear translocation imaging, CREB phosphorylation, electrophysiology, BDNF rescue","pmids":["26977770"],"confidence":"High","gaps":["Relationship between Jacob and nuclear NELF function unclear","Carrier mechanism of long-distance nuclear import not detailed here"]},{"year":2023,"claim":"Defined NSMF's biophysical role at stalled forks, showing it scaffolds RPA and selectively shifts RPA to the stable 30-nt binding mode to potentiate ATR-mediated RPA32 phosphorylation.","evidence":"Co-IP, single-molecule DNA binding assays, purified-protein RPA binding mode analysis; KO mouse genomic instability assays","pmids":["37378431","33963872"],"confidence":"High","gaps":["Structural basis of RPA-mode displacement unresolved","How NSMF is recruited to forks not defined"]},{"year":2024,"claim":"Rapid-depletion studies redefined NELF's primary role as focusing initiation sites and controlling termination/chromatin architecture rather than canonical pause-release, with loss driving transcription-replication conflict.","evidence":"Auxin-inducible degradation of NELF-B/C, PRO-seq, TT-seq/NET-seq, DFF-ChIP, termination factor ChIP","pmids":["38197272","40","32155413"],"confidence":"High","gaps":["Reconciliation of pause-release versus initiation/termination models incomplete","Subunit-specific contributions to each function not fully separated"]},{"year":null,"claim":"How the same NSMF locus partitions into the nuclear NELF complex versus the synapto-nuclear/replication-fork Jacob protein, and whether their genome-protective functions mechanistically intersect, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Isoform/protein product relationship between NELF-A and Jacob/NSMF undefined in the corpus","No unified structural or regulatory model spanning both functions","Tissue-specific expression switching not characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,24,33]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[6,10,19,28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,24,29]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[27,30]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,13,26]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[8,26]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,2,11,24]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[8,21,16]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[23,35,27,30]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[26,42]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[34]}],"complexes":["NELF complex (NELF-A/B/C/D/E)"],"partners":["DSIF","NELFB","NELFE","INTEGRATOR","PARP1","BRCA1","RPA","ATR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6X4W1","full_name":"NMDA receptor synaptonuclear signaling and neuronal migration factor","aliases":["Nasal embryonic luteinizing hormone-releasing hormone factor","Nasal embryonic LHRH factor"],"length_aa":530,"mass_kda":60.1,"function":"Couples NMDA-sensitive glutamate receptor signaling to the nucleus and triggers long-lasting changes in the cytoarchitecture of dendrites and spine synapse processes. Part of the cAMP response element-binding protein (CREB) shut-off signaling pathway. Stimulates outgrowth of olfactory axons and migration of gonadotropin-releasing hormone (GnRH) and luteinizing-hormone-releasing hormone (LHRH) neuronal cells","subcellular_location":"Nucleus; Nucleus envelope; Nucleus membrane; Nucleus matrix; Cytoplasm; Cytoplasm, cell cortex; Cytoplasm, cytoskeleton; Cell membrane; Cell projection, dendrite; Synapse; Synapse, synaptosome; Postsynaptic density; Membrane","url":"https://www.uniprot.org/uniprotkb/Q6X4W1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NSMF","classification":"Not Classified","n_dependent_lines":14,"n_total_lines":1208,"dependency_fraction":0.011589403973509934},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NSMF","total_profiled":1310},"omim":[{"mim_id":"614838","title":"HYPOGONADOTROPIC HYPOGONADISM 9 WITH OR WITHOUT ANOSMIA; HH9","url":"https://www.omim.org/entry/614838"},{"mim_id":"608137","title":"NMDA RECEPTOR SYNAPTONUCLEAR SIGNALING AND NEURONAL MIGRATION FACTOR; NSMF","url":"https://www.omim.org/entry/608137"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":654.1}],"url":"https://www.proteinatlas.org/search/NSMF"},"hgnc":{"alias_symbol":[],"prev_symbol":["NELF"]},"alphafold":{"accession":"Q6X4W1","domains":[{"cath_id":"3.40.50","chopping":"346-518","consensus_level":"high","plddt":93.998,"start":346,"end":518}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6X4W1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6X4W1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6X4W1-F1-predicted_aligned_error_v6.png","plddt_mean":64.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NSMF","jax_strain_url":"https://www.jax.org/strain/search?query=NSMF"},"sequence":{"accession":"Q6X4W1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6X4W1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6X4W1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6X4W1"}},"corpus_meta":[{"pmid":"10199401","id":"PMC_10199401","title":"NELF, a 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is a multisubunit complex that cooperates with DSIF to strongly repress RNA polymerase II elongation; this repression is reversed by P-TEFb-dependent phosphorylation of the Pol II C-terminal domain. The smallest subunit of NELF is identical to RD, a putative RNA-binding protein.\",\n      \"method\": \"Purification from HeLa nuclear extract, in vitro transcription elongation assays with DRB, biochemical reconstitution\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purification and in vitro reconstitution of activity, replicated across multiple subsequent studies\",\n      \"pmids\": [\"10199401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NELF contains five polypeptides (A–E): NELF-A has similarity to hepatitis delta antigen and is critical for RNAPII binding and transcriptional pausing; NELF-B is identical to COBRA1 (a BRCA1-associated protein); NELF-C and NELF-D are related to TH1; NELF-B and NELF-C/D are integral subunits that bring NELF-A and NELF-E together. Coexpression of all four proteins in insect cells reconstitutes functionally active NELF. The HDAg-homology region of NELF-A is critical for RNAPII binding.\",\n      \"method\": \"Subunit identification, recombinant coexpression in insect cells, in vitro transcription assays with mutant complexes\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution of active complex plus mutagenesis defining critical regions, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12612062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NELF and DSIF cause promoter-proximal pausing of RNA Pol II on the Drosophila hsp70 gene. Immunodepletion of NELF from Drosophila nuclear extract reduced paused polymerase levels. In vivo cross-linking showed NELF and DSIF associate with the hsp70 promoter region before heat shock. After heat shock induction, DSIF and Pol II but not NELF were recruited to chromosomal puffs at hsp70 genes, suggesting NELF dissociates upon activation.\",\n      \"method\": \"Immunodepletion from nuclear extract, RNA interference in salivary glands, in vivo protein-DNA cross-linking (ChIP), immunofluorescence on polytene chromosomes\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo and in vitro methods, replicated in subsequent studies\",\n      \"pmids\": [\"12782658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"DSIF and NELF associate with the RNA Pol II elongation complex during early transcription elongation and travel with elongation complexes as nascent RNA is synthesized. HIV-1 Tat stimulates P-TEFb-mediated phosphorylation of DSIF and RNA Pol II during elongation to overcome NELF/DSIF repression.\",\n      \"method\": \"Stepwise RNA Pol II walking approach, Western blotting, in vitro kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted elongation complex walking assay plus kinase assay, single lab\",\n      \"pmids\": [\"11112772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FACT functions with P-TEFb to relieve DSIF/NELF-mediated transcriptional repression. TFIIH kinase activity is dispensable for this relief, demonstrating that TFIIH-mediated CTD phosphorylation is not involved in regulating FACT and DSIF/NELF activities. FACT acts on naked DNA templates independently of its chromatin activities.\",\n      \"method\": \"In vitro transcription elongation assay with purified factors, kinase inhibition experiments\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components and genetic dissection of kinase requirements, single lab\",\n      \"pmids\": [\"10912001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Drosophila NELF has four subunits analogous to human NELF subunits. Immunodepletion of NELF from Drosophila nuclear extract impairs promoter-proximal pausing on the hsp70 promoter without affecting transcription initiation. ChIP detects NELF at hsp70 and beta1-tubulin promoters; heat shock induction causes marked decrease of NELF at the hsp70 promoter.\",\n      \"method\": \"Immunodepletion, in vitro transcription, chromatin immunoprecipitation (ChIP), immunofluorescence on polytene chromosomes\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, immunodepletion, in vitro transcription), single lab\",\n      \"pmids\": [\"15741180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NELF-E RRM adopts a betaalphabetabetaalphabeta fold and binds to HIV TAR RNA. NMR solution structure of the RRM was determined. The RRM binds single-stranded TAR RNA oligoribonucleotides with Kd values in the low-micromolar range.\",\n      \"method\": \"NMR solution structure determination, fluorescence equilibrium titration binding assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure plus quantitative binding measurements, single lab\",\n      \"pmids\": [\"16898873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NELF-mediated transcriptional pausing has a dual role at the human junB gene: before IL-6 induction, RNAPII, DSIF, and NELF accumulate at ~+50 from TSS; after induction, depletion of NELF enhances junB mRNA both before and after induction, indicating NELF-mediated pausing contributes to negative regulation at both stages.\",\n      \"method\": \"Chromatin immunoprecipitation, RNA interference (siRNA knockdown), RT-PCR\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus RNAi knockdown with mRNA quantification, single lab\",\n      \"pmids\": [\"16880520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NELF interacts with the nuclear cap-binding complex (CBC) and together they participate in 3'-end processing of replication-dependent histone mRNAs through association with SLBP. Absence of NELF and CBC causes aberrant production of polyadenylated histone mRNAs. NELF is physically associated with histone gene loci and forms distinct intranuclear foci (NELF bodies) that overlap with Cajal bodies and cleavage bodies.\",\n      \"method\": \"Co-immunoprecipitation, RNA interference, RT-PCR, chromatin immunoprecipitation, immunofluorescence microscopy\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, ChIP, knockdown with defined molecular phenotype), replicated for multiple NELF subunits\",\n      \"pmids\": [\"17499042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NELF is associated with the HIV LTR and pauses RNA Pol II at the LTR in a repressed state. NELF depletion increased processive HIV transcription and replication, released paused Pol II, displaced a positioned nucleosome, and increased histone H4 acetylation, linking transcription elongation to chromatin remodeling.\",\n      \"method\": \"Chromatin immunoprecipitation, NELF depletion (RNAi), Pol II mapping on LTR, nucleosome positioning analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, Pol II mapping, and RNAi with multiple molecular readouts, single lab\",\n      \"pmids\": [\"17442680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NELF-E RRM undergoes major conformational changes upon RNA binding: the flexible C-terminal region and loop between beta3 and alpha2 show large chemical shift perturbations. RNA binding induces formation of a helix in the C-terminus, resulting in an RNA-bound structure similar to U1A RRM.\",\n      \"method\": \"NMR solution structure of RNA-bound NELF-E RRM, chemical shift perturbation analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure determination with bound RNA, single lab\",\n      \"pmids\": [\"18303858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NELF is concentrated at the 5' ends of ~2,111 genes genome-wide in Drosophila cells (ChIP-chip), and 46 of 56 tested NELF-associated genes display paused Pol II 30–50 nt downstream of TSS. NELF associates with ~39% of GAGA factor-bound genes. NELF associates with ~half of the most highly expressed genes, indicating it is not necessarily a repressor.\",\n      \"method\": \"ChIP-chip (genome-wide location analysis), permanganate genomic footprinting for paused Pol II detection\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-chip combined with permanganate footprinting, large-scale dataset\",\n      \"pmids\": [\"18332113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NELF-E is predominantly nuclear in GnRH neurons. Mutagenesis of a putative nuclear localization signal results in impaired nuclear expression. NELF knockdown impairs GnRH neuronal migration of NLT cells in vitro.\",\n      \"method\": \"Immunofluorescence, NLS mutagenesis, siRNA knockdown with migration assay\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — NLS mutagenesis and knockdown migration assay, single lab, limited mechanistic depth\",\n      \"pmids\": [\"20025934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NELF subunits exhibit distinct subcellular localizations including NELF bodies and midbodies; some subunits shuttle actively between nucleus and cytoplasm. Loss of NELF from cells leads to enlarged and/or multiple nuclei.\",\n      \"method\": \"Live imaging of GFP-fusion proteins, FRAP, subcellular fractionation, fluorescence microscopy\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with FRAP and multiple localization methods, single lab\",\n      \"pmids\": [\"19245807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DSIF and NELF require a nascent transcript longer than 18 nt to stably associate with the Pol II elongation complex. Spt5 (DSIF) contacts nascent RNA as it emerges from the elongation complex via protein-RNA cross-linking, suggesting DSIF binds via the nascent transcript and subsequently recruits NELF. No NELF-RNA contact was detected when the nascent transcript was between 22–31 nt (the pausing region), suggesting RNA binding by NELF is not required for promoter-proximal pausing.\",\n      \"method\": \"Reconstituted Drosophila Pol II elongation complex, protein-RNA cross-linking, DSIF/NELF binding assays with defined RNA lengths\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined RNA lengths and cross-linking, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"20534440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The timing between NELF loading onto Pol II and Pol II escape from the promoter determines the location of the promoter-proximal pause. GAF (sequence-specific transcription factor) orchestrates efficient pausing by recruiting NELF to promoters before transcription initiation and by assisting in loading NELF onto Pol II after initiation.\",\n      \"method\": \"Permanganate-ChIP-seq (genome-wide), biochemical reconstitution system for promoter-proximal pausing\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution plus genome-wide permanganate-ChIP-seq, single lab with two orthogonal approaches\",\n      \"pmids\": [\"23746353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NELF interacts with the Integrator complex subunits (INTScom) in an RNA- and DNA-independent manner. Integrator subunits control NELF-mediated RNAPII pause/release at coding genes; INTS11 catalytic subunit is required for RNAPII processivity. NELF-target genes are enriched in TAR/NBE-like elements and 3'-box sequences.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ChIP, nascent RNA analysis, genome-wide studies\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus genome-wide ChIP and knockdown with defined molecular phenotypes, single lab\",\n      \"pmids\": [\"25410209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NELF interacts with Pcf11 (a transcription termination factor) to couple RNAP II pausing to premature transcription termination at the HIV LTR. NELF also interacts with the corepressor complex NCoR1-GPS2-HDAC3, which is associated with repressed HIV LTRs. Depleting NELF or Pcf11 in primary CD4+ T cells induces HIV transcription elongation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown in primary T cells, HIV transcription assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP and functional knockdown, single lab\",\n      \"pmids\": [\"23884411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BRD4 coordinates recruitment of both the pause release factor P-TEFb and the pausing complex NELF/DSIF to IFN-stimulated genes. A BRD4 small-molecule inhibitor blocks IFN-induced recruitment of P-TEFb and NELF/DSIF. NELF knockdown revealed it negatively regulates Pol II passage across ISGs during elongation.\",\n      \"method\": \"ChIP, shRNA knockdown, small-molecule BRD4 inhibitor treatment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and knockdown with defined molecular phenotypes, single lab\",\n      \"pmids\": [\"23589332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NELF-E contains an RNA Recognition Motif (RRM) that binds a consensus NELF-E binding element (NBE: CUGAGGA(U) for Drosophila). An NBE-like element is present in the loop of HIV-1 TAR RNA and is required for high-affinity binding (not the lower stem as previously claimed). NBEs are enriched +20 to +30 nt downstream of TSS genome-wide in paused genes.\",\n      \"method\": \"In vitro SELEX, quantitative biochemical binding assays, genome-wide NBE analysis in Drosophila\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro SELEX plus quantitative binding and genome-wide analysis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24453987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"eRNAs interact with the NELF complex and facilitate transient release of NELF from specific target promoters (immediate early genes) during transcriptional activation in neurons. Knockdown of enhancer-specific eRNAs impairs NELF release from promoters and decreases target mRNA induction. Enhancer-promoter chromatin looping enables local eRNA action.\",\n      \"method\": \"RNA immunoprecipitation, eRNA knockdown (siRNA), ChIP, chromatin conformation capture\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-IP plus ChIP and knockdown with specific molecular phenotype, single lab\",\n      \"pmids\": [\"25263592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DSIF and NELF associate with Integrator to specify the correct post-transcriptional fate of snRNA genes. Knockdown of NELF results in misprocessing of U1, U2, U4, and U5 snRNAs, disruption of transcription termination, and induction of polyadenylated U1 transcripts via enhanced recruitment of cleavage stimulation factor. DSIF is required for proper transcription of these snRNA genes.\",\n      \"method\": \"Co-immunoprecipitation, RNA interference (siRNA), ChIP, RT-PCR for snRNA processing\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ChIP, and knockdown with multiple molecular phenotypes replicated across multiple snRNA genes\",\n      \"pmids\": [\"24968874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The C-terminal peptides of NELF-E and ARS2 bind identically to the nuclear cap-binding complex (CBC), and affinity is enhanced when CBC is bound to a cap analogue. NELF-E and ARS2 compete for the same CBC binding site, forming mutually exclusive complexes: CBC-NELF-E (likely earlier transcription phase) and CBC-ARS2-PHAX (later phase). NELF-E binding to CBC is incompatible with PHAX binding.\",\n      \"method\": \"Biochemical binding assays, crystal structure determination of CBC-NELF-E peptide complex\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus biochemical competition assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"29101316\"],\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. NELF-E is preferentially recruited to DSBs upstream of transcriptionally active genes; RNA Pol II presence is a prerequisite. NELF-E recruitment and its repressive activity are required for switching off transcription at DSBs and for intact repair of DSBs.\",\n      \"method\": \"I-SceI endonuclease and CRISPR-Cas9 DSB systems, ChIP, live imaging, transcription and repair assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple DSB systems, ChIP, and functional repair assays, single lab\",\n      \"pmids\": [\"28336775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structure of the paused transcription elongation complex (Pol II-DSIF-NELF) at 3.2 Å. NELF binds the polymerase funnel, bridges two mobile polymerase modules, and contacts the trigger loop, restraining Pol II mobility required for pause release. NELF prevents TFIIS binding. NELF has two flexible 'tentacles' that can contact DSIF and exiting RNA. The paused complex features a tilted DNA-RNA hybrid that impairs NTP substrate binding.\",\n      \"method\": \"Cryo-electron microscopy structure determination at 3.2 Å, structural analysis of complex interfaces\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structure with detailed mechanistic interpretation, widely replicated and cited\",\n      \"pmids\": [\"30135580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Upon rapid NELF depletion, RNA Pol II fails to be released into gene bodies, stalling instead around the +1 nucleosomal dyad-associated region in a manner independent of P-TEFb. NELF depletion results in global loss of cap-binding complex (CBC) from chromatin without global reduction of nascent transcript 5' cap stability, implicating NELF in early elongation complexes distinct from canonical pause-release.\",\n      \"method\": \"Auxin-inducible degron (rapid NELF depletion), PRO-seq, ChIP-seq\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rapid protein depletion combined with multiple orthogonal genomic assays, single lab\",\n      \"pmids\": [\"32155413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NELF rapidly forms nuclear condensates upon stress (heat, oxidative, osmotic stress) in human cells. Condensate formation requires NELF dephosphorylation and SUMOylation induced by stress. The intrinsically disordered region (IDR) in NELFA is necessary for nuclear NELF condensation and can be functionally replaced by IDRs of FUS or EWSR1. Biomolecular condensation facilitates enhanced recruitment of NELF to promoters upon stress to drive transcriptional downregulation. NELF condensation is required for cellular viability under stressful conditions.\",\n      \"method\": \"Live cell imaging, FRAP, SUMOylation assays, dephosphorylation assays, IDR domain swap experiments, ChIP upon stress\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, FRAP, PTM analysis, domain swaps, ChIP), replicated across stress conditions\",\n      \"pmids\": [\"33548202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NSMF (Jacob/NSMF protein) localizes rapidly to stalled replication forks and acts as a scaffold to modulate RPA complex formation with CDC5L and ATR/ATRIP. Depletion of NSMF compromises phosphorylation and ubiquitination of RPA2 and the ATR signaling cascade, resulting in genomic instability. NSMF knockout mice exhibited increased genomic instability and hypersensitivity to genotoxic stress.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence at stalled forks, siRNA knockdown, NSMF knockout mice, ATR signaling assays (phosphorylation, ubiquitination)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, knockout mouse model, and multiple biochemical pathway assays, single lab\",\n      \"pmids\": [\"33963872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"eRNAs stimulate Pol II pause release by making multiple allosteric contacts with NELF subunits -A and -E to trigger efficient NELF detachment from paused Pol II. eRNA function requires length >200 nucleotides and unpaired guanosines; it does not require common structural or sequence motifs.\",\n      \"method\": \"In vitro NELF-eRNA binding assays, cross-linking mass spectrometry, eRNA length/structure mutants, pause release functional assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutant eRNAs plus cross-linking MS identifying specific contacts, single lab\",\n      \"pmids\": [\"35508485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ERK phosphorylates NELF-A upon growth factor stimulation, causing dissociation of NELF from paused Pol II at promoter-proximal regions of immediate-early genes to allow productive elongation. PP2A efficiently dephosphorylates NELF-A, preventing aberrant IEG expression. In cancer cells, decreased PP2A activity combined with oncogene-mediated ERK activation induces NELF-A phosphorylation and IEG upregulation.\",\n      \"method\": \"In vitro kinase assay (ERK→NELF-A), phosphorylation site identification (MS), ChIP, growth factor stimulation experiments, PP2A inhibitor treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay identifying substrate plus ChIP and cell-based validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"36463234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NSMF physically interacts with RPA at DNA damage sites. NSMF selectively displaces RPA in weakly bound 8- and 20-nucleotide binding modes from ssDNA, allowing retention of stable RPA molecules in the 30-nt binding mode. The 30-nt binding mode of RPA enhances RPA32 phosphorylation by ATR, and phosphorylated RPA becomes stabilized on ssDNA.\",\n      \"method\": \"Co-immunoprecipitation, single-molecule DNA binding assays, purified protein biochemical assays, RPA binding mode analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro single-molecule assays plus Co-IP, defining a precise biophysical mechanism, single lab\",\n      \"pmids\": [\"37378431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NELF-depleted Drosophila cells recapitulate NELF-independent pausing observed in fission yeast. Only NELF-mediated pausing establishes a strict requirement for Cdk9 kinase activity for Pol II pause release into productive elongation. In NELF-depleted cells, Cdk9 inhibition fails to shut down transcription efficiently, allowing non-productive transcription to continue.\",\n      \"method\": \"NELF depletion in Drosophila cells, Cdk9 inhibition, PRO-seq, genetic epistasis analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis analysis combining NELF depletion and Cdk9 inhibition with nascent RNA sequencing, single lab\",\n      \"pmids\": [\"37179384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structure of the human NELF-B/C/E ternary complex was solved at high resolution. Detailed interaction interfaces between subunits were characterized, and residues important for the NELF-B and NELF-E association were identified.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Weak — high-resolution crystal structure, single lab, no functional mutagenesis follow-up described in abstract\",\n      \"pmids\": [\"37591184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NELF depletion increased utilization of downstream transcription start sites and caused genome-wide loss of H3K4me3-marked nucleosomes. NELF depletion had minimal effect on paused transcript levels and almost no effect on productive elongation control, redefining NELF as a factor that focuses initiation sites and maintains promoter chromatin architecture rather than primarily controlling pause-release.\",\n      \"method\": \"Auxin-inducible degradation of NELFB, PRO-seq (nascent RNA), DFF-ChIP (chromatin architecture)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rapid protein depletion with two orthogonal genome-wide assays, single lab\",\n      \"pmids\": [\"38197272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Jacob (encoded by the Nsmf gene) mediates BDNF-induced NMDAR-dependent nuclear translocation in early development. Nuclear import of Jacob results in increased phosphorylation of CREB and enhanced CREB-dependent Bdnf gene transcription. Nsmf knockout mice show reduced hippocampal Bdnf mRNA and protein, reduced pCREB, hippocampal dysplasia with fewer synapses, simplified dendrites, reduced LTP, and deficits in hippocampus-dependent learning. BDNF application rescues morphological deficits in Jacob-deficient hippocampal neurons.\",\n      \"method\": \"Nsmf knockout mouse generation, immunofluorescence for nuclear translocation, CREB phosphorylation assays, Bdnf mRNA/protein quantification, electrophysiology (LTP), BDNF rescue experiments\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — comprehensive knockout mouse phenotyping with multiple orthogonal molecular and electrophysiological methods plus BDNF rescue\",\n      \"pmids\": [\"26977770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NELF-E interacts with BRCA1 and promotes BRCA1 recruitment to laser-microirradiated DSB sites. NELF-E deficiency reduces BRCA1 and RAD51 IRIF formation, impairs homology-directed repair (HDR) of chromosomal DSBs, and sensitizes HCC cells to PARP inhibition (synthetic lethality).\",\n      \"method\": \"Co-immunoprecipitation, laser microirradiation with live imaging, IRIF assays, CRISPR-Cas9 HDR assay, PARP inhibitor sensitivity assay\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, recruitment imaging, and functional HDR assays with PARP inhibitor synthetic lethality, single lab\",\n      \"pmids\": [\"33248388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Haploinsufficiency of NELF-A (WHSC2) in Wolf-Hirschhorn syndrome patient cells contributes to: delayed progression from S-phase into M-phase, reduced DNA replication in asynchronous culture, and altered chromatin assembly (reduced histone-chromatin association, elevated soluble chaperone-bound histone H3, increased MNase sensitivity). Cells also show increased sensitivity to camptothecin-induced inhibition of DNA replication.\",\n      \"method\": \"Patient-derived cell lines with differing 4p deletions, cell cycle analysis, DNA replication assays, chromatin fractionation, MNase digestion, drug sensitivity assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cells with multiple assays, but haploinsufficiency context (not clean single-gene KO) and confounded by SLBP co-deletion\",\n      \"pmids\": [\"22328085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NELF-A subunit interacts with the ecdysone receptor (EcR) in Drosophila and the NELF complex is recruited to promoters and enhancers of 20E-dependent genes. NELF depletion causes significant decrease in 20E-induced transcription, disruption of Pol II elongation complexes, and a considerable reduction in promoter-bound Spt5 (DSIF subunit), suggesting NELF stabilizes the Pol II-DSIF complex.\",\n      \"method\": \"Co-immunoprecipitation (NELF-A/EcR), ChIP at 20E-dependent promoters, NELF depletion with nascent RNA analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus ChIP, single lab, limited mechanistic depth in abstract\",\n      \"pmids\": [\"33420323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CTCF knockdown abrogates RNAP II pausing at c-myc by affecting DSIF recruitment. CTCF knockdown causes a termination defect on U2 snRNA genes by affecting NELF recruitment. CTCF is also required for recruitment of P-TEFb, which phosphorylates NELF, DSIF, and Ser2 of RNAP II CTD.\",\n      \"method\": \"ChIP, CTCF siRNA knockdown, RNAP II pausing and termination assays\",\n      \"journal\": \"Transcription\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and knockdown experiments at defined loci, single lab\",\n      \"pmids\": [\"26399478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NELF-A and NELF-B independently act as competitive decelerators at steps downstream of glucocorticoid receptor (GR) action to attenuate GR-mediated gene induction and reduce partial agonist activity. A conserved motif in NELF-A and NELF-B is required for full modulatory activity. ChIP assays show NELF-B diminishes GR recruitment to promoter regions of endogenous genes.\",\n      \"method\": \"Competition transcription assays, ChIP, stable NELF-B knockdown, domain mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, knockdown, and mutagenesis identifying a required motif, single lab\",\n      \"pmids\": [\"24097989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Acute loss of NELF-C globally redistributes termination factors and perturbs Pol II transcription termination independently of promoter-proximal Pol II pausing. This drives pervasive Pol II transcription into DNA replication initiation zones, causing transcription-replication conflict that blocks cell cycle transition into S phase.\",\n      \"method\": \"Auxin-dependent NELF-C degradation, nascent transcript sequencing (TT-seq/NET-seq), termination factor ChIP\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rapid inducible protein depletion with multiple genomic assays and cell cycle phenotype, single lab\",\n      \"pmids\": [\"41721097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NSMF deficiency impairs replication fork progression under stress conditions in colorectal cancer cells, resulting in DNA damage accumulation, growth arrest, and senescence. NSMF overexpression provides resistance to oncogene-induced replication stress, enabling cancer cells to evade senescence. In ApcMin/+ mice, Nsmf knockout selectively induces replication-dependent DNA damage in tumor tissues.\",\n      \"method\": \"NSMF knockout in ApcMin/+ mice, replication fork progression assays, DNA damage markers, senescence assays, NSMF overexpression experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model plus cell-based functional assays, single lab\",\n      \"pmids\": [\"41533586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HSPA1A and DNAJB1 regulate NELF condensate dynamics during heat shock recovery. DNAJB1 recognizes NELFA's tentacle domain and facilitates HSPA1A recruitment, preventing aberrant NELF aggregation and enabling timely condensate disassembly. Disruption of NELF condensate dynamics causes persistent NELFA phosphorylation, impaired chromatin association, destabilized Pol II pausing, and premature release of non-productive Pol II complexes.\",\n      \"method\": \"Nanobody-based proximity labeling (NbPro), Co-IP, live imaging, domain mapping, ChIP, nascent RNA analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling identifying chaperone interactors plus multiple functional validation approaches, single lab\",\n      \"pmids\": [\"41653920\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NELF (also known as NSMF for the gene locus) encodes multiple functional proteins: the canonical NELF complex (comprising NELF-A/B/C/D/E subunits) is a metazoan-specific negative elongation factor that associates with the Pol II elongation complex via the nascent RNA (nascent RNA >18 nt required), binds the Pol II funnel and trigger loop to stabilize promoter-proximal paused Pol II (defined by cryo-EM structure), cooperates with DSIF to repress elongation in a manner reversed by P-TEFb-mediated CTD phosphorylation and ERK-mediated NELF-A phosphorylation; NELF also interacts with CBC/SLBP for histone mRNA 3'-end processing, with Integrator for snRNA processing and pause-release control, and forms stress-induced nuclear condensates (requiring NELF dephosphorylation and SUMOylation of the NELFA IDR) that drive transcriptional downregulation; additionally NELF-E is recruited to DNA double-strand breaks via PARP1 to repress transcription and facilitate BRCA1/RAD51-dependent homologous recombination repair; separately, the NSMF/Jacob protein (encoded by the same locus) functions as a synapto-nuclear messenger that transports NMDAR-derived signals to the nucleus to activate CREB and sustain BDNF signaling during hippocampal dendritogenesis, and also acts as a scaffold at stalled replication forks to modulate RPA binding modes on ssDNA and potentiate ATR-mediated RPA32 phosphorylation for the DNA replication stress response.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"The NSMF locus encodes two functionally distinct proteins built on transcriptional and genome-protective roles. The dominant product is NELF-A, a subunit of the metazoan negative elongation factor (NELF) complex of five polypeptides (A–E) that, together with DSIF, represses RNA polymerase II elongation in a manner reversed by P-TEFb-mediated CTD phosphorylation [#0, #1]. NELF establishes promoter-proximal pausing of Pol II 30–50 nt downstream of transcription start sites genome-wide, requiring a nascent transcript longer than 18 nt and orchestrated recruitment by sequence-specific factors such as GAF [#2, #11, #14, #15]. Structurally, NELF binds the polymerase funnel and trigger loop to restrain Pol II mobility, exclude TFIIS, and stabilize a paused state with a tilted DNA-RNA hybrid that impairs NTP binding [#24]. Pause release is triggered by enhancer RNAs that allosterically contact NELF-A and NELF-E to detach the complex, and by ERK-mediated NELF-A phosphorylation (counteracted by PP2A) at immediate-early genes [#28, #29]. Beyond canonical pausing, NELF couples to RNA processing machineries—the cap-binding complex and SLBP for histone mRNA 3'-end processing, and Integrator for snRNA processing and termination [#8, #21, #16]—and recent rapid-depletion studies redefine NELF as a factor that focuses initiation sites, maintains promoter chromatin architecture, and controls termination to prevent transcription-replication conflicts [#33, #40]. Under stress, NELF forms nuclear condensates dependent on NELF-A dephosphorylation and SUMOylation of its intrinsically disordered region to drive transcriptional downregulation, with condensate dynamics regulated by the HSPA1A/DNAJB1 chaperone system [#26, #42]. In the DNA damage response, NELF-E is recruited to double-strand breaks via PARP1 to repress local transcription and promote BRCA1/RAD51-dependent homologous recombination [#23, #35]. Separately, the NSMF/Jacob protein from the same locus functions as a synapto-nuclear messenger transducing NMDAR/BDNF signals to activate CREB and sustain Bdnf transcription during hippocampal dendritogenesis [#34], and acts as a scaffold at stalled replication forks that modulates RPA binding modes on ssDNA to potentiate ATR-mediated RPA32 phosphorylation and the replication stress response [#27, #30].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that a multisubunit factor cooperates with DSIF to repress Pol II elongation, defining the existence of negative elongation control reversible by P-TEFb.\",\n      \"evidence\": \"Purification from HeLa nuclear extract with in vitro transcription elongation assays\",\n      \"pmids\": [\"10199401\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subunit composition and individual subunit roles not yet resolved\", \"Mechanism of Pol II contact unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined NELF as a five-subunit complex and assigned NELF-A as the critical Pol II-binding subunit, enabling functional reconstitution.\",\n      \"evidence\": \"Subunit identification, recombinant coexpression in insect cells, mutant in vitro transcription assays\",\n      \"pmids\": [\"12612062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of subunit assembly not determined\", \"How NELF-A contacts Pol II at atomic level unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated in vivo that NELF drives promoter-proximal pausing at an inducible gene and dissociates upon activation, linking the factor to gene regulation.\",\n      \"evidence\": \"Immunodepletion, RNAi in salivary glands, ChIP and polytene immunofluorescence in Drosophila\",\n      \"pmids\": [\"12782658\", \"15741180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal triggering NELF dissociation not defined\", \"Genome-wide scope of pausing not yet assessed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed NELF-mediated pausing is a genome-wide phenomenon affecting thousands of genes, including highly expressed ones, expanding NELF beyond a simple repressor.\",\n      \"evidence\": \"ChIP-chip and permanganate genomic footprinting in Drosophila\",\n      \"pmids\": [\"18332113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of which genes are paused not fully defined\", \"Functional consequence of pausing at active genes unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved how NELF is loaded onto the elongation complex, showing DSIF binds nascent RNA >18 nt and recruits NELF, while NELF RNA binding is dispensable for pausing.\",\n      \"evidence\": \"Reconstituted Drosophila Pol II elongation complex with protein-RNA cross-linking and defined RNA lengths\",\n      \"pmids\": [\"20534440\", \"23746353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of NELF-E RNA binding in vivo remained ambiguous\", \"Timing of loading relative to pause position needed structural context\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined NELF-E's RNA-binding specificity (NBE consensus) and identified eRNAs as physiological ligands that release NELF during activation, connecting enhancers to pause control.\",\n      \"evidence\": \"SELEX, quantitative binding, genome-wide NBE analysis; RNA-IP, ChIP, and eRNA knockdown in neurons\",\n      \"pmids\": [\"24453987\", \"25263592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of eRNA-induced NELF release not yet shown\", \"Generality of eRNA mechanism across gene classes unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended NELF function beyond pausing to RNA processing, coupling it to CBC/SLBP for histone mRNA 3'-end formation and revealing NELF nuclear bodies.\",\n      \"evidence\": \"Co-IP, RNAi, ChIP, RT-PCR, immunofluorescence\",\n      \"pmids\": [\"17499042\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking pausing to processing not defined\", \"Composition and function of NELF bodies unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established NELF/DSIF–Integrator coupling for correct snRNA processing and termination, broadening NELF's role to non-coding RNA fate.\",\n      \"evidence\": \"Co-IP, ChIP, RNAi with snRNA processing readouts; reciprocal Integrator interaction studies\",\n      \"pmids\": [\"24968874\", \"25410209\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NELF directs processing versus pausing not mechanistically separated\", \"Catalytic interplay with INTS11 incompletely defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided the atomic mechanism of pausing, showing NELF binds the polymerase funnel and trigger loop to restrain Pol II and exclude TFIIS.\",\n      \"evidence\": \"Cryo-EM structure of Pol II-DSIF-NELF at 3.2 Å\",\n      \"pmids\": [\"30135580\", \"37591184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of pause-to-release transition not captured\", \"Conformational basis of eRNA-triggered detachment unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified ERK phosphorylation of NELF-A (opposed by PP2A) and allosteric eRNA contacts as triggers of NELF dissociation, linking signaling to pause release at immediate-early genes.\",\n      \"evidence\": \"In vitro kinase assays, MS site mapping, ChIP, PP2A inhibition; in vitro eRNA binding with cross-linking MS\",\n      \"pmids\": [\"36463234\", \"28336775\", \"35508485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of multiple release signals in vivo not resolved\", \"Quantitative contribution of each pathway per gene unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed stress-induced NELF condensation governed by dephosphorylation and NELF-A IDR SUMOylation as a mechanism for transcriptional downregulation and stress survival.\",\n      \"evidence\": \"Live imaging, FRAP, SUMOylation/dephosphorylation assays, IDR domain swaps, ChIP under stress\",\n      \"pmids\": [\"33548202\", \"41653920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which target genes are silenced by condensates not fully mapped\", \"How condensation alters Pol II engagement mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connected NELF-E to genome maintenance through PARP1-dependent recruitment to DSBs, BRCA1 interaction, and promotion of homologous recombination.\",\n      \"evidence\": \"I-SceI/CRISPR DSB systems, laser microirradiation, Co-IP, IRIF and HDR assays, PARP inhibitor synthetic lethality\",\n      \"pmids\": [\"28336775\", \"33248388\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether transcriptional repression and HR promotion are separable not resolved\", \"Mechanism of BRCA1 recruitment by NELF-E undefined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the distinct NSMF/Jacob protein as a synapto-nuclear messenger transducing NMDAR/BDNF signals to CREB to sustain Bdnf transcription and dendritogenesis.\",\n      \"evidence\": \"Nsmf knockout mice, nuclear translocation imaging, CREB phosphorylation, electrophysiology, BDNF rescue\",\n      \"pmids\": [\"26977770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between Jacob and nuclear NELF function unclear\", \"Carrier mechanism of long-distance nuclear import not detailed here\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined NSMF's biophysical role at stalled forks, showing it scaffolds RPA and selectively shifts RPA to the stable 30-nt binding mode to potentiate ATR-mediated RPA32 phosphorylation.\",\n      \"evidence\": \"Co-IP, single-molecule DNA binding assays, purified-protein RPA binding mode analysis; KO mouse genomic instability assays\",\n      \"pmids\": [\"37378431\", \"33963872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of RPA-mode displacement unresolved\", \"How NSMF is recruited to forks not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Rapid-depletion studies redefined NELF's primary role as focusing initiation sites and controlling termination/chromatin architecture rather than canonical pause-release, with loss driving transcription-replication conflict.\",\n      \"evidence\": \"Auxin-inducible degradation of NELF-B/C, PRO-seq, TT-seq/NET-seq, DFF-ChIP, termination factor ChIP\",\n      \"pmids\": [\"38197272\", \"40\", \"32155413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of pause-release versus initiation/termination models incomplete\", \"Subunit-specific contributions to each function not fully separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the same NSMF locus partitions into the nuclear NELF complex versus the synapto-nuclear/replication-fork Jacob protein, and whether their genome-protective functions mechanistically intersect, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Isoform/protein product relationship between NELF-A and Jacob/NSMF undefined in the corpus\", \"No unified structural or regulatory model spanning both functions\", \"Tissue-specific expression switching not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 24, 33]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [6, 10, 19, 28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 24, 29]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [27, 30]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 13, 26]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [8, 26]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 2, 11, 24]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [8, 21, 16]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [23, 35, 27, 30]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [26, 42]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [34]}\n    ],\n    \"complexes\": [\n      \"NELF complex (NELF-A/B/C/D/E)\"\n    ],\n    \"partners\": [\n      \"DSIF\",\n      \"NELFB\",\n      \"NELFE\",\n      \"Integrator\",\n      \"PARP1\",\n      \"BRCA1\",\n      \"RPA\",\n      \"ATR\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}