{"gene":"ERCC1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1986,"finding":"ERCC1 cDNA was cloned and found to encode a 297-amino acid protein; only the larger 1.1 kb transcript (not the alternatively spliced shorter form) could confer UV and mitomycin-C resistance to repair-deficient CHO cells. Significant amino acid sequence homology was found between ERCC1 and the yeast excision repair protein RAD10, particularly in a region with structural similarity to DNA-binding domains.","method":"DNA-mediated gene transfer, cDNA cloning, sequence analysis, complementation assay in UV-sensitive CHO mutant 43-3B","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct complementation in repair-deficient cells, sequence analysis, foundational cloning paper replicated by many subsequent studies","pmids":["2420469"],"is_preprint":false},{"year":1985,"finding":"The yeast RAD10 gene (ortholog of ERCC1) is required for the incision step of nucleotide excision repair of UV-damaged DNA. A genomic deletion of RAD10 does not affect viability but causes high UV sensitivity.","method":"Genetic complementation (transformation of rad10 mutants), nucleotide sequencing, UV sensitivity assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic complementation with defined phenotypic readout, foundational work replicated in multiple subsequent studies","pmids":["3912171"],"is_preprint":false},{"year":1990,"finding":"RAD10 protein was purified from yeast and shown to be a DNA-binding protein with strong preference for single-stranded DNA. RAD10 promotes renaturation (annealing) of complementary DNA strands.","method":"Protein purification, DNA-binding assay, strand annealing assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified recombinant protein, in vitro biochemical characterization with multiple assays","pmids":["1741062"],"is_preprint":false},{"year":1990,"finding":"RAD10 is required for mitotic recombination in yeast; the rad10 deletion reduced intrachromosomal recombination at direct repeats and lowered efficiency of homologous integration of linear DNA. RAD1 and RAD10 function together in the same recombination pathway, distinct from the RAD52 pathway.","method":"Genetic epistasis analysis, recombination frequency assay in yeast deletion mutants","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis with defined pathway placement, replicated by multiple subsequent studies","pmids":["2188090"],"is_preprint":false},{"year":1992,"finding":"RAD1 and RAD10 proteins form a stable, specific complex in vivo (shown by co-immunoprecipitation) and in vitro. The interaction is mediated by C-terminal regions of both proteins, is resistant to 1 M NaCl and low SDS, and is essential for DNA repair and recombination activities (a rad1 mutant defective in RAD10 binding is also defective in repair and recombination).","method":"Co-immunoprecipitation from yeast cell extracts, in vitro co-IP, hydroxylamine mutagenesis to identify interaction-defective mutant","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — reciprocal Co-IP in vivo and in vitro, mutagenesis confirming functional requirement, replicated by multiple labs","pmids":["1518857"],"is_preprint":false},{"year":1992,"finding":"The RAD1-RAD10 complex constitutes a single-stranded DNA endonuclease; purified Rad1 and Rad10 together specifically degrade single-stranded DNA by an endonucleolytic mechanism.","method":"Protein purification, in vitro endonuclease assay on single-stranded DNA substrates","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified proteins reconstituted in vitro, enzymatic activity directly demonstrated","pmids":["8479526"],"is_preprint":false},{"year":1993,"finding":"ERCC1 co-corrects NER defects of rodent group 1, group 4, and XP-F cell extracts; group 1-correcting activity has a native molecular mass of ~100 kDa and contains the 33 kDa ERCC1 polypeptide together with XPF/ERCC4 correcting activity, establishing that ERCC1 exists as a functional heterodimeric complex with XPF.","method":"In vitro NER reconstitution, biochemical fractionation, immunoblotting, complementation of cell-free extracts","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with cell-free extracts, biochemical fractionation, multiple orthogonal methods","pmids":["8253090"],"is_preprint":false},{"year":1993,"finding":"Rad1-Rad10 complex forms in the yeast cell nucleus; the Rad10-binding domain of Rad1 maps to amino acids 809-997, and the Rad1-binding domain of Rad10 maps to amino acids 90-210. These domains are hydrophobic and evolutionarily conserved. No interaction was detected between human ERCC1 and yeast Rad1.","method":"Two-hybrid system (in vivo nuclear interaction), domain mapping","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two-hybrid system demonstrating nuclear complex and domain mapping, single lab","pmids":["8361362"],"is_preprint":false},{"year":1993,"finding":"Purified Rad1/Rad10 complex has endonuclease activity on single-stranded DNA (preferentially) and negatively supercoiled double-stranded DNA; it produces 3'-OH and 5'-phosphate termini. The complex lacks exonuclease activity and does not preferentially cleave UV-irradiated DNA. Rad1 and Rad10 associate in a 1:1 stoichiometric complex of ~190 kDa.","method":"Protein purification, in vitro endonuclease assay, substrate specificity analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified recombinant proteins, comprehensive in vitro biochemical characterization","pmids":["8253764"],"is_preprint":false},{"year":1994,"finding":"XPA and ERCC1 specifically interact both in vivo (two-hybrid system) and in vitro (with recombinant proteins). Initial domain mapping identified regions in ERCC1 and XPA mediating this interaction, suggesting XPA may recruit the ERCC1-containing incision complex to damaged DNA.","method":"Yeast two-hybrid assay, in vitro binding with recombinant proteins, domain mapping","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — two orthogonal methods (two-hybrid + recombinant protein binding), replicated by subsequent studies","pmids":["8197174"],"is_preprint":false},{"year":1994,"finding":"Purified Rad1-Rad10 cleaves model recombination and repair intermediates at duplex-single-strand junctions, specifically on the strand containing the 3' single-stranded tail, establishing that the complex incises DNA 5' to damaged bases during NER and cleaves specific recombination intermediates.","method":"In vitro endonuclease assay on model recombination and repair intermediate substrates with purified proteins","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with defined substrates and purified proteins, mechanistically informative","pmids":["8091230"],"is_preprint":false},{"year":1995,"finding":"The XPF-ERCC1 heterodimer was purified from HeLa cells; it contains ERCC1 (38 kDa) and XPF (112 kDa), complementing NER defects in ERCC-1, ERCC-4, and XP-F cell-free extracts. The complex has endonuclease activity preferring single-stranded DNA and the single-stranded bubble region of duplex DNA; nicking of supercoiled DNA is stimulated by RPA in the presence of UV damage.","method":"Protein purification from HeLa cells, NER complementation assay, endonuclease activity assay, RPA stimulation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — native complex purification, multiple biochemical assays, complementation of multiple repair-deficient extracts","pmids":["7559382"],"is_preprint":false},{"year":1995,"finding":"RAD1 and RAD10 are uniquely required among NER genes for double-strand break-induced recombination; only rad1 and rad10 deletions (not rad2, rad3, rad14, rad7, rad16 mutations) caused ~20-fold reduction in gap repair and single-strand annealing at HO-induced DSBs, establishing a specific role for the Rad1-Rad10 complex in removing nonhomologous sequences from DSB ends.","method":"Genetic epistasis with HO endonuclease-induced DSBs, recombination frequency measurement in yeast deletion mutants","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis screen across nine NER genes, clear pathway specificity established, replicated by multiple labs","pmids":["7891718"],"is_preprint":false},{"year":1995,"finding":"Purified Rad1-Rad10 incises bubble structure DNA at the 5' side of the unpaired region. When co-incubated with XPG, incisions occurred at both sides of the bubble, reconstituting the dual incision step of NER. Rad1-Rad10 was unable to resolve synthetic Holliday junctions (negative finding regarding previously proposed junction resolution activity).","method":"In vitro incision assay with purified Rad1-Rad10 and XPG on synthetic bubble substrates","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted dual incision with purified proteins, mechanistically defining 5' incision role, replicated finding","pmids":["7559571"],"is_preprint":false},{"year":1996,"finding":"MSH2 and MSH3 mismatch repair proteins function in the RAD1-RAD10 recombination pathway; msh3 mutations have an effect on recombination similar to rad1/rad10 mutations, and epistasis analysis places MSH2 and MSH3 in the RAD1-RAD10 pathway of mitotic recombination.","method":"Genetic epistasis analysis, recombination frequency measurement in yeast deletion mutants","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple alleles, single lab","pmids":["8849883"],"is_preprint":false},{"year":1996,"finding":"RPA and ERCC1 both bind to distinct, non-overlapping regions of XPA and can form a ternary RPA-XPA-ERCC1 complex in vitro. The KD of RPA for XPA is 1.9×10⁻⁸ M and of ERCC1 for XPA is 2.5×10⁻⁷ M. RPA binds XPA first (sequentially) and facilitates subsequent ERCC1 binding.","method":"In vitro binding assays, surface plasmon resonance, domain mapping, ternary complex detection","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative binding constants by SPR, ternary complex demonstrated in vitro, domain mapping, single lab with multiple orthogonal methods","pmids":["8972858"],"is_preprint":false},{"year":1998,"finding":"Recombinant ERCC1-XPF purified from insect cells cleaves stem-loop, splayed arm, and flap substrates at duplex-single-strand junctions, removing 3' protruding single-stranded arms; cleavage requires divalent cations (optimal in 0.2 mM Mn²⁺), a minimum of 4-8 unpaired nucleotides, and a single-stranded arm (3' or 5'). All incisions occur in the duplex strand at the 5' side of the junction, 2-8 nt from the junction, independent of other proteins (e.g., RPA).","method":"In vitro endonuclease assay with purified recombinant ERCC1-XPF on defined substrate structures, divalent cation requirement analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified recombinant complex, comprehensive substrate specificity analysis with multiple substrate types and biochemical conditions","pmids":["9525876"],"is_preprint":false},{"year":2001,"finding":"ERCC1 and XPF are mutually dependent for stability in mammalian cells. Separately produced ERCC1 and XPF can reconstitute functional ERCC1-XPF when combined, establishing that the individual subunits can fold independently. ERCC1 alone showed partial NER repair activity in ERCC1-defective extracts due to trace XPF present. ERCC1 lacking the first 88 amino acids retained function. Sequence comparison revealed homology between the C-terminal regions of ERCC1 and XPF, suggesting an ancient gene duplication.","method":"Recombinant protein expression in E. coli, NER complementation assay with cell-free extracts, immunoassay for XPF levels","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution from separately produced subunits, functional NER assay, multiple orthogonal methods","pmids":["11160918"],"is_preprint":false},{"year":2002,"finding":"Rad1-Rad10 (ERCC1-XPF ortholog) and Tdp1 function as redundant primary pathways for repair of Top1 replication damage in yeast; tdp1 rad1 double mutants are highly sensitive to camptothecin and show a TOP1-dependent growth defect. Both pathways feed into RAD52/RAD51/RAD50-dependent recombination equally. The Rad1-Rad10 pathway also requires RAD59 and SRS2 and is independent of other NER genes.","method":"Genetic epistasis analysis, camptothecin sensitivity assay, synthetic lethality analysis in yeast deletion mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — extensive genetic epistasis across multiple pathways, clear pathway placement, replicated findings","pmids":["12368472"],"is_preprint":false},{"year":2002,"finding":"Endogenous DNA abasic sites cause synthetic lethality in yeast lacking Apn1, Apn2, and Rad1/Rad10 (or Rad1), establishing that Rad1-Rad10 processes 3'-blocked single-strand breaks arising from abasic site processing under physiological conditions.","method":"Genetic synthetic lethality analysis, bacterial complementation (Nfo expression), epistasis with DNA glycosylase mutants","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic combinations tested, mechanistic pathway established, replicated by related studies","pmids":["12032096"],"is_preprint":false},{"year":2004,"finding":"Rad1-Rad10 nuclease is required for removal of 3'-blocked termini from oxidative DNA strand breaks; yeast Rad1-Rad10 nuclease cleaves DNA with a 3'-phosphoglycolate terminus, and three pathways (Apn1, Apn2, Rad1-Rad10) remove 3'-blocked termini from H₂O₂-induced strand breaks.","method":"In vitro nuclease assay on 3'-phosphoglycolate-terminated substrate, genetic epistasis in yeast deletion mutants, H₂O₂ sensitivity assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical cleavage assay plus supporting genetic data, novel substrate activity demonstrated","pmids":["15371342"],"is_preprint":false},{"year":2004,"finding":"XPF/ERCC1 is stably associated with hRad52 in human cell-free extracts; the interaction is direct, mediated by the N-terminal domain of hRad52 and XPF. Complex formation stimulates XPF/ERCC1 endonuclease activity and simultaneously attenuates hRad52 strand annealing activity.","method":"Co-immunoprecipitation from cell-free extracts, direct binding assay with recombinant proteins, domain mapping, endonuclease activity assay, strand annealing assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reciprocal Co-IP plus direct binding with purified proteins plus functional assays, multiple orthogonal methods","pmids":["14734547"],"is_preprint":false},{"year":2004,"finding":"ERCC1 physically interacts with MSH2 complexes in HeLa cell extracts, and suppression of ERCC1 increases sensitivity to cisplatin (but not UV) in XPA-deficient cells in an MSH2-dependent manner, establishing a co-operative role of ERCC1 and MSH2 in cisplatin ICL resistance independent of NER. The ERCC1 region required for MSH2 co-immunoprecipitation maps to amino acids 184-260, overlapping with the XPF-binding domain.","method":"RNA interference, co-immunoprecipitation from HeLa extracts, domain mapping by tagged ERCC1, cisplatin sensitivity assay in XPA-deficient cells","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, RNAi epistasis across multiple cell lines, domain mapping, multiple orthogonal methods","pmids":["14706347"],"is_preprint":false},{"year":2008,"finding":"ERCC1-XPF endonuclease is required for DSB repair in mammals; ERCC1-XPF-deficient fibroblasts are hypersensitive to gamma irradiation with persistent γH2AX foci. In vitro DSB repair of substrates with 3' overhangs generates large deletions in the absence of ERCC1-XPF. Ercc1⁻/⁻ Ku86⁻/⁻ double mutant fibroblasts are more sensitive to irradiation than single mutants, indicating ERCC1-XPF participates in a Ku86-independent end-joining pathway.","method":"Gamma irradiation sensitivity assay, γH2AX foci analysis, in vitro DSB repair assay, mouse epistasis genetics (Ercc1/Ku86 double mutant)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple cell and mouse genetic models, in vitro repair assay, multiple orthogonal methods in single study","pmids":["18541667"],"is_preprint":false},{"year":2008,"finding":"ERCC1/XPF limits LINE-1 retrotransposition; reduction of XPF in human cells increased retrotransposition, and complementation of ERCC1-deficiency in hamster cells reduced retrotransposition, establishing that the ERCC1-XPF heterodimer processes flap intermediates generated during LINE-1 retrotransposition.","method":"siRNA knockdown, genetic complementation of ERCC1-deficient hamster cells, retrotransposition reporter assay","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two complementary genetic approaches (KD and complementation), single lab","pmids":["18396111"],"is_preprint":false},{"year":2008,"finding":"Saw1 protein was identified as required for Rad1/Rad10-dependent processing of recombination intermediates in SSA; Saw1 physically interacts with Rad1/Rad10, Msh2/Msh3, and Rad52, and saw1 mutants defective in Rad1 interaction (but retaining Rad52/Msh2 interaction) are defective in 3' flap removal. Deletion of SAW1 abolished Rad1 association at SSA intermediates in vivo.","method":"Microarray-based genetic screen, physical interaction assays, ChIP, SSA assay in yeast","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (screen, physical interaction, ChIP, functional assay), clear mechanistic placement","pmids":["18471978"],"is_preprint":false},{"year":2009,"finding":"XPF-ERCC1 is required for ICL unhooking and for stable localization of monoubiquitinated FANCD2 to chromatin at ICL sites; in XPF-ERCC1-deficient cells, FANCD2 monoubiquitination occurs but its chromatin association is dramatically reduced and ICL-induced FANCD2 foci are significantly lower, establishing that ICL unhooking by XPF-ERCC1 is necessary for FA pathway activation and subsequent HR-mediated DSB repair.","method":"FANCD2 monoubiquitination assay, chromatin fractionation, immunofluorescence foci analysis in Ercc1⁻/⁻ and XPF-deficient cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple cell systems (mouse, human, hamster), chromatin fractionation plus immunofluorescence, epistasis with FA pathway","pmids":["19805513"],"is_preprint":false},{"year":2010,"finding":"Mec1/Tel1-dependent phosphorylation of Slx4 at Thr113 is required for efficient cleavage of 3' non-homologous DNA tails by Rad1-Rad10 during SSA and HR. Slx4 is recruited to 3' NH tails during DSB repair independently of its phosphorylation, but phosphorylation is required for Rad1-Rad10 cleavage activity at these sites.","method":"DSB repair assay, phosphorylation site mutagenesis, ChIP, epistasis with mec1/tel1 mutants in yeast","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Strong — site-specific mutagenesis, ChIP in vivo, multiple orthogonal methods","pmids":["20382573"],"is_preprint":false},{"year":2012,"finding":"Multiple DNA binding domains of ERCC1-XPF cooperate for NER activity; mutations in the HhH domain of ERCC1 and the nuclease domain of XPF abolish cleavage on model substrates. Mutations in multiple binding domains are needed to diminish NER activity, suggesting protein-protein interactions in the NER incision complex compensate for individual DNA binding defects. ICL repair requires tighter substrate binding than NER (more sensitive to DNA-binding mutations).","method":"In vitro cleavage assay on model substrates, NER activity assay in cell extracts and in vivo with domain mutants, mitomycin C and UV sensitivity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure-function analysis with multiple mutants, in vitro and in vivo complementary assays","pmids":["22547097"],"is_preprint":false},{"year":2012,"finding":"Rad1-Rad10 nuclease promotes formation of crossover recombinants between dispersed repeat sequences (ectopic sequences); all three nucleases (Rad1-Rad10, Mus81-Mms4, Yen1) participate in processing recombination intermediates between dispersed repeats, and Rad1-Rad10 promotes crossovers via a mechanism involving clipping and subsequent resolution of a Holliday junction-containing intermediate.","method":"Genetic analysis in yeast deletion mutants, measurement of crossover and noncrossover recombinants, detection of joint molecule intermediates","journal":"Nature structural & molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with triple mutant, joint molecule detection, single lab","pmids":["22885325"],"is_preprint":false},{"year":2013,"finding":"Saw1 is a structure-specific DNA binding protein with high affinity for splayed arm and 3'-flap DNAs; Saw1 directly interacts with Rad1 to facilitate targeting of Rad1/Rad10 to 3'-tailed substrates in vivo and in vitro, and enhances 3'-tail cleavage by Rad1/Rad10 in a purified system. The order of assembly is: Saw1 (structure-specific DNA binding) → recruits Rad1/Rad10 → cleavage of 3' tails.","method":"Purified protein DNA-binding assay, in vitro cleavage assay with purified proteins, ChIP, physical interaction assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with purified proteins, in vitro and in vivo complementary methods, mechanistic order of assembly defined","pmids":["23299942"],"is_preprint":false},{"year":2013,"finding":"Only one of four ERCC1 protein isoforms (the full-length isoform) has full capacity for nucleotide excision repair and cisplatin resistance; none of the 16 commercially available ERCC1 antibodies (including 8F1) can distinguish among the four isoforms, limiting their diagnostic utility.","method":"NER functional assay for each isoform, cisplatin resistance assay, antibody epitope mapping for 16 antibodies","journal":"The New England journal of medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct functional assay for each isoform, comprehensive antibody panel testing, single large study with multiple orthogonal methods","pmids":["23514287"],"is_preprint":false},{"year":2013,"finding":"Small molecule NSC 130813 disrupts the ERCC1-XPF protein-protein interaction in cells and synergizes with cisplatin and mitomycin C; the compound binds directly to the XPF domain responsible for ERCC1 interaction (demonstrated by Biacore surface plasmon resonance), increases UV-mediated cytotoxicity, and modifies DNA repair (γH2AX staining).","method":"Virtual screening, Biacore binding assay, proximity ligation assay, cytotoxicity assay, γH2AX analysis","journal":"Molecular pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by SPR, cellular interaction disruption by PLA, single lab","pmids":["23580445"],"is_preprint":false},{"year":2014,"finding":"XPF-ERCC1 cooperates with SLX4/FANCP to perform unhooking incisions during replication-coupled ICL repair in Xenopus egg extracts; efficient recruitment of XPF-ERCC1 and SLX4 to the ICL depends on FANCD2 monoubiquitination.","method":"Xenopus egg extract ICL repair assay, immunodepletion, recruitment assay at ICL sites","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted replication-coupled ICL repair in cell-free system, immunodepletion, mechanistic order established","pmids":["24726325"],"is_preprint":false},{"year":2014,"finding":"USP45 deubiquitylase associates with ERCC1 via a short acidic motif outside the USP45 catalytic domain, deubiquitylates ERCC1 in vitro, and is required for ERCC1 translocation to UV-damage-induced subnuclear foci. USP45 knockout cells have elevated ubiquitylated ERCC1, are hypersensitive to UV and ICL agents (similar to ERCC1-deficient cells), and show reduced UV-induced DNA damage repair.","method":"Co-immunoprecipitation, in vitro deubiquitylation assay, USP45 knockout cells, immunofluorescence foci assay, UV/ICL sensitivity assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro deubiquitylation assay, KO cells with defined phenotype, localization assay, multiple orthogonal methods","pmids":["25538220"],"is_preprint":false},{"year":2014,"finding":"EGFR and ERCC1 interact upon ionizing radiation (IR)-induced DNA damage; this interaction was identified by mass spectrometry of the EGFR interactome, validated biochemically and by proximity ligation assay. Depletion of ERCC1 or EGFR impairs IR-induced DNA repair (comet assay, γH2AX foci), and this EGFR-dependent repair pathway operates independently of DNA-PKcs.","method":"Mass spectrometry of EGFR interactome, biochemical co-immunoprecipitation, proximity ligation assay, siRNA knockdown, comet assay, γH2AX foci analysis in DNAPKcs-deficient cells","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry plus PLA validation, functional knockdown data, single lab","pmids":["24780295"],"is_preprint":false},{"year":2015,"finding":"ERCC1-XPF participates in repair of Top1-attached nick DNA lesions; ERCC1-XPF shows nuclease activity on 3'-phosphotyrosyl bond nick-containing DNA in the presence of RPA. ERCC1-XPF and RPA form a DNA-protein complex on nick DNA substrates in vitro, co-localize in camptothecin-treated cells, and DNA repair synthesis of Tyr-nick DNA lesions occurs with NER factors including ERCC1-XPF.","method":"In vitro nuclease assay on Tyr-nick DNA substrate, electrophoretic mobility shift assay, co-localization by immunofluorescence, in vitro repair synthesis assay","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assays with defined substrate, co-localization in vivo, single lab","pmids":["26025908"],"is_preprint":false},{"year":2017,"finding":"ERCC1-XPF complex interacts with the insulator binding protein CTCF, cohesin subunits SMC1A and SMC3, and MBD2 in mouse liver nuclei; ERCC1-XPF co-localizes with ATRX at promoters and imprinting control regions (ICRs) of imprinted genes during postnatal hepatic development. Loss of Ercc1 or DNA crosslink damage triggers CTCF localization to heterochromatin, dissociation of CTCF-cohesin and ATRX from ICRs, altered histone marks, and aberrant developmental expression of imprinted genes without altering DNA methylation.","method":"In vivo biotinylation tagging in mice, co-immunoprecipitation, ChIP, gene expression analysis in Ercc1 knockout and MMC-treated mice","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo biotinylation tagging, ChIP, mouse KO model, multiple orthogonal methods identifying novel non-repair function","pmids":["28368372"],"is_preprint":false},{"year":2018,"finding":"Two rad1 mutations that disrupt XPF-Rpa1 interactions selectively disable non-NER functions (ICL repair, direct repeat recombination) while retaining UV lesion repair activity; analogous mutations in XPF also compromised XPF-Rpa1 and XPF-Slx4 interactions, and these cells are proficient in NER but deficient in ICLR and direct repeat recombination, establishing distinct interaction surfaces for NER vs. non-NER activities.","method":"Site-directed mutagenesis, UV and ICL sensitivity assays, co-immunoprecipitation, SSA and ICLR assays in yeast and human cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — separation-of-function mutations, orthogonal assays for NER vs. non-NER activities, complementary yeast and human cell data","pmids":["29795289"],"is_preprint":false},{"year":2019,"finding":"ERCC1/XPF is required for repair of DSBs containing DNA secondary structures, including AT-rich sequences from common fragile sites and G-quadruplexes (G4s); XPF inactivation is synthetically lethal with FANCM deficiency, and ERCC1/XPF-deficient cells are sensitized to G4-interacting compounds.","method":"siRNA knockdown and CRISPR knockout of XPF, DSB repair assays, synthetic lethality assay with FANCM, G4-interacting compound sensitivity assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic approaches with defined substrates and compounds, single lab, multiple repair pathway readouts","pmids":["31153042"],"is_preprint":false},{"year":2019,"finding":"SLX4IP binds simultaneously to SLX4 and XPF-ERCC1; disruption of one interaction also disrupts the other. SLX4IP binding to both proteins promotes the SLX4-XPF-ERCC1 interaction, especially after DNA damage, and maintains SLX4IP protein stability. SLX4IP depletion sensitizes cells to ICL-inducing agents and causes G2/M accumulation.","method":"Co-immunoprecipitation, domain interaction mapping, siRNA knockdown, ICL sensitivity assay, cell cycle analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, functional knockdown assays, single lab","pmids":["31495888"],"is_preprint":false},{"year":2019,"finding":"TGFβ treatment leads to enhanced NER of bulky DNA damage via increased interaction between ERCC1-XPF and ERCC1-XPA and their nuclear localization; this effect requires intact TGFβ signaling (Smad4-dependent) and is abolished by ERCC1 knockdown.","method":"RNAi, co-immunoprecipitation of ERCC1-XPF and ERCC1-XPA, nuclear localization analysis, DNA damage repair assay (NER)","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating increased interaction, RNAi epistasis, single lab","pmids":["30418489"],"is_preprint":false},{"year":2021,"finding":"The ERCC1 R156W missense mutation disrupts a salt bridge below the XPA-binding pocket, causing dramatically reduced ERCC1 and XPF protein levels; mutant ERCC1 weakly interacts with NER and ICL repair proteins, shows diminished recruitment to DNA damage, and results in strongly reduced NER activity and increased chromosome breakage by crosslinkers. DSB repair was relatively normal in these patient-derived cells.","method":"Patient-derived fibroblasts and knock-in epithelial cells, protein interaction assays, NER activity assay, chromosome breakage assay, recruitment to DNA damage (immunofluorescence)","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient-derived cells plus knock-in model, multiple functional assays, clear structure-function relationship","pmids":["33315086"],"is_preprint":false},{"year":2021,"finding":"XAB2 splicing factor interacts with ERCC1-XPF and XPG endonucleases outside of NER; the trimeric XAB2-ERCC1-XPF-XPG complex binds RNA:DNA hybrids under conditions favoring R-loop formation. XAB2 depletion leads to R-loop formation and DNA damage, and transcription-blocking DNA lesions trigger release of XAB2 from RNA targets.","method":"In vivo biotinylation tagging in mice, co-immunoprecipitation, RNA:DNA hybrid binding assay, siRNA knockdown, R-loop detection","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo tagging approach, Co-IP, RNA:DNA hybrid binding assay, functional depletion studies, multiple orthogonal methods","pmids":["34039990"],"is_preprint":false},{"year":2011,"finding":"ERCC1 knockdown (but not XPF knockdown) causes multinucleation in human hepatocellular carcinoma cells (Huh7), HeLa, and human fibroblasts, with defects in metaphase and cytokinesis. This phenotype was rescued by ERCC1 overexpression and occurred in XPF-mutant fibroblasts after ERCC1 knockdown, but not after XPF knockdown. Other NER gene knockdowns (XPC, XPF) did not cause multinucleation, indicating an NER-independent, XPF-independent role for ERCC1 in mitotic progression.","method":"siRNA knockdown, ERCC1 overexpression rescue, live cell imaging, cell cycle analysis, phenotypic characterization in multiple cell lines","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell lines tested, rescue by overexpression, negative controls (XPF KD, XPC KD), single lab","pmids":["21839691"],"is_preprint":false},{"year":2024,"finding":"SNRPA splicing factor controls alternative splicing of ERCC1 exon 8; SNRPA depletion causes ERCC1 exon 8 skipping, reduced ERCC1-XPF complex formation, and reversal of cisplatin resistance in lung adenocarcinoma cells. SNRPA overexpression has the opposite effect. m6A reader IGF2BP1 and RNA stabilizer ELAVL1 bind SNRPA mRNA and promote SNRPA-dependent ERCC1-E8(+) expression and cisplatin resistance.","method":"CRISPR/Cas9 knockout, shRNA knockdown, overexpression, RT-PCR for splicing, Western blot for ERCC1-XPF complex, cisplatin sensitivity assay, mouse xenograft model","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic tools, in vitro and in vivo (xenograft) validation, single lab","pmids":["39555714"],"is_preprint":false}],"current_model":"ERCC1 functions exclusively as the obligate partner subunit of the ERCC1-XPF (XPF/ERCC4) heterodimeric structure-specific endonuclease, which incises DNA at duplex/single-strand junctions on the strand bearing the 5' side of the junction; this activity—requiring divalent cations and a minimum of 4–8 unpaired nucleotides—executes the 5' incision in nucleotide excision repair, unhooks interstrand crosslinks (in cooperation with SLX4/FANCP and dependent on FANCD2 ubiquitylation), removes 3' non-homologous tails during single-strand annealing and gene conversion (facilitated by Saw1/SLX4 scaffold proteins and regulated by Mec1/Tel1 phosphorylation of SLX4), and processes 3'-blocked strand breaks from oxidative damage; ERCC1's stability and recruitment to DNA damage depend on its interaction with XPF (mutual stabilization), on deubiquitylation by USP45, and on XPA-mediated loading onto damage sites (where ERCC1 also forms a sequential ternary complex with RPA); additionally, ERCC1-XPF has non-repair roles including interacting with CTCF/cohesin to silence imprinted genes, with hRad52 to process recombination intermediates, with XAB2 to resolve R-loops, and with EGFR in ionizing radiation-induced strand-break repair, while ERCC1 alone (independent of XPF) is required for proper mitotic progression and cytokinesis."},"narrative":{"mechanistic_narrative":"ERCC1 is the obligate non-catalytic partner subunit of the ERCC1-XPF structure-specific endonuclease, a heterodimer that incises duplex DNA on the 5' side of duplex/single-strand junctions and thereby executes the 5' incision step of nucleotide excision repair (NER) and a broad set of related DNA-processing reactions [PMID:8253090, PMID:7559382, PMID:9525876]. The protein was first cloned by complementation of repair-deficient CHO cells and recognized as the homolog of yeast RAD10, whose product is a single-stranded-DNA-binding protein required for the incision step of NER [PMID:2420469, PMID:3912171, PMID:1741062]. ERCC1/RAD10 functions only in stable 1:1 complex with XPF/RAD1, an interaction mediated by conserved C-terminal regions and required for both nuclease activity and complex assembly; the two subunits are mutually dependent for stability in mammalian cells [PMID:1518857, PMID:8253764, PMID:11160918]. The reconstituted complex cleaves stem-loop, splayed-arm, bubble and flap substrates at the 5' side of the junction, requiring divalent cations and a minimum of 4-8 unpaired nucleotides, and cooperates with XPG to perform the dual incision of NER [PMID:7559571, PMID:9525876]. Multiple DNA-binding domains, including the ERCC1 HhH domain and the XPF nuclease domain, act cooperatively, and distinct interaction surfaces separate NER from non-NER activities [PMID:22547097, PMID:29795289]. Recruitment to damage is governed by ERCC1's interactions with XPA and RPA, which form a sequential ternary RPA-XPA-ERCC1 complex that loads the incision complex onto lesions, while ERCC1 stability and translocation to UV-damage foci depend on deubiquitylation by USP45 [PMID:8197174, PMID:8972858, PMID:25538220]. Beyond NER, ERCC1-XPF removes 3' non-homologous tails during single-strand annealing and recombination through scaffolds such as Saw1/SLX4 (the latter regulated by Mec1/Tel1 phosphorylation), unhooks interstrand crosslinks in cooperation with SLX4/FANCP downstream of FANCD2 monoubiquitination, processes 3'-blocked oxidative and Top1-derived strand breaks, and participates in double-strand break repair [PMID:7891718, PMID:18471978, PMID:19805513, PMID:20382573, PMID:24726325, PMID:15371342, PMID:18541667]. Non-repair roles include silencing of imprinted genes through CTCF/cohesin/ATRX, resolution of R-loops via the splicing factor XAB2, and modulation of hRad52 recombination activity [PMID:28368372, PMID:34039990, PMID:14734547]. ERCC1 also has an XPF-independent function in mitotic progression and cytokinesis [PMID:21839691]. The ERCC1 R156W mutation, which destabilizes ERCC1 and XPF and impairs damage recruitment, causes a human NER/crosslink-repair-deficiency disorder [PMID:33315086].","teleology":[{"year":1986,"claim":"Establishing the molecular identity of the human repair gene: cloning ERCC1 and recognizing its homology to yeast RAD10 created the framework for understanding it as a conserved NER factor.","evidence":"cDNA cloning and complementation of UV/mitomycin-C-sensitive CHO mutants, with sequence comparison to RAD10","pmids":["2420469","3912171"],"confidence":"High","gaps":["Cloning alone did not define the biochemical activity or partner of ERCC1","The functional transcript was identified but the protein's enzymatic role was unknown"]},{"year":1992,"claim":"Defining the functional unit: RAD1-RAD10 (XPF-ERCC1) forms an obligate, salt-resistant complex that is itself a single-stranded-DNA endonuclease, answering whether the subunits act alone or together.","evidence":"Reciprocal Co-IP in vivo and in vitro, interaction-defective mutants, purified-protein endonuclease assays in yeast","pmids":["1518857","8479526","1741062"],"confidence":"High","gaps":["Did not yet define the precise junction geometry of cleavage","Substrate range beyond ssDNA was unresolved"]},{"year":1995,"claim":"Placing the activity in NER mechanistically: the complex incises at the 5' side of bubble structures and, with XPG, reconstitutes the dual incision of NER, resolving which incision the complex performs.","evidence":"Native HeLa complex purification, in vitro incision/dual-incision assays on bubble substrates, RPA stimulation","pmids":["7559382","7559571","8253090"],"confidence":"High","gaps":["Did not explain how the complex is targeted to lesions in cells","Ruled out Holliday junction resolution but left recombination intermediate roles open"]},{"year":1996,"claim":"Defining damage targeting: ERCC1 and RPA bind distinct regions of XPA to form a sequential RPA-XPA-ERCC1 ternary complex, explaining how the incision nuclease is recruited to lesions.","evidence":"Yeast two-hybrid, recombinant binding, SPR affinity measurements and domain mapping","pmids":["8197174","8972858"],"confidence":"High","gaps":["Did not establish the in vivo order of assembly at chromatin lesions","Regulation of recruitment by post-translational modification was unaddressed"]},{"year":1998,"claim":"Generalizing substrate specificity: purified recombinant ERCC1-XPF cleaves diverse junction substrates 5' of the junction with defined cation and unpaired-nucleotide requirements, establishing it as a general structure-specific endonuclease.","evidence":"In vitro endonuclease assays on stem-loop, splayed-arm and flap substrates with purified recombinant complex","pmids":["9525876"],"confidence":"High","gaps":["Did not connect each in vitro substrate to a specific in vivo pathway","Cofactor requirements in cells were not defined"]},{"year":2004,"claim":"Expanding pathway scope: genetic and biochemical work showed Rad1-Rad10/ERCC1-XPF processes recombination intermediates, removes 3'-blocked termini from oxidative breaks, and modulates hRad52, defining non-NER DNA-processing roles.","evidence":"Yeast epistasis and synthetic lethality, in vitro cleavage of 3'-phosphoglycolate substrates, Co-IP and functional assays with hRad52","pmids":["7891718","12368472","12032096","15371342","14734547","14706347"],"confidence":"High","gaps":["Recruitment factors for non-NER substrates were not yet identified","Whether these roles were direct nuclease functions or scaffolding was not always resolved"]},{"year":2010,"claim":"Identifying recruitment scaffolds for recombination/SSA: Saw1 and Slx4 target Rad1-Rad10 to 3' tails, with Mec1/Tel1 phosphorylation of Slx4 licensing cleavage, defining how the nuclease is directed to recombination intermediates.","evidence":"Genetic screen, ChIP, physical interaction mapping, SSA assays and phosphosite mutagenesis in yeast","pmids":["18471978","20382573","23299942"],"confidence":"High","gaps":["The mammalian equivalents of all scaffold interactions were not fully mapped","How phosphorylation activates cleavage mechanistically was unresolved"]},{"year":2014,"claim":"Integrating into the Fanconi/ICL pathway and defining its regulation: XPF-ERCC1 cooperates with SLX4/FANCP for ICL unhooking downstream of FANCD2 monoubiquitination, and USP45 deubiquitylation controls ERCC1 stability and damage localization.","evidence":"Xenopus egg-extract replication-coupled ICL repair with immunodepletion; FANCD2 chromatin/foci assays; in vitro deubiquitylation and USP45 knockout cells","pmids":["24726325","19805513","25538220"],"confidence":"High","gaps":["The catalytic step of unhooking versus scaffold recruitment was not fully separated","Other regulatory modifications of ERCC1 were not characterized"]},{"year":2018,"claim":"Separating NER from non-NER functions genetically: mutations disrupting XPF-Rpa1 interactions abolish ICL repair and recombination while preserving NER, proving distinct interaction surfaces drive distinct pathways.","evidence":"Separation-of-function site-directed mutagenesis with NER, SSA and ICLR assays in yeast and human cells","pmids":["29795289","22547097"],"confidence":"High","gaps":["Full structural basis for each interaction surface was not resolved","How cells partition the complex between pathways was unaddressed"]},{"year":2021,"claim":"Establishing non-repair functions and disease relevance: ERCC1-XPF silences imprinted genes via CTCF/cohesin/ATRX and resolves R-loops via XAB2, while the R156W mutation links ERCC1 destabilization to a human repair-deficiency disorder.","evidence":"In vivo biotinylation tagging, ChIP and KO mice for imprinting/R-loops; patient-derived and knock-in cells with NER and crosslinker assays","pmids":["28368372","34039990","33315086"],"confidence":"High","gaps":["Whether the imprinting and R-loop roles require nuclease activity is unclear","The mechanistic basis of the XPF-independent mitotic role of ERCC1 is undefined"]},{"year":null,"claim":"It remains unresolved how ERCC1 executes its XPF-independent role in mitotic progression and cytokinesis, and how the complex is partitioned among its many repair and non-repair functions in cells.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No molecular partner identified for the XPF-independent mitotic function of ERCC1","No structural model integrating NER, ICL and recombination interaction surfaces"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[5,8,10,11,13,16,20]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[5,8,16,20]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,5,16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[9,15,17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,34,37]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[26,34]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6,11,13,16,23,26]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[37,43]}],"complexes":["ERCC1-XPF endonuclease","RPA-XPA-ERCC1 ternary complex","SLX4-XPF-ERCC1","XAB2-ERCC1-XPF-XPG"],"partners":["XPF","XPA","RPA","SLX4","HRAD52","MSH2","USP45","XAB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P07992","full_name":"DNA excision repair protein ERCC-1","aliases":[],"length_aa":297,"mass_kda":32.6,"function":"Non-catalytic component of a structure-specific DNA repair endonuclease responsible for the 5'-incision during DNA repair. Responsible, in conjunction with SLX4, for the first step in the repair of interstrand cross-links (ICL). Participates in the processing of anaphase bridge-generating DNA structures, which consist in incompletely processed DNA lesions arising during S or G2 phase, and can result in cytokinesis failure. Also required for homology-directed repair (HDR) of DNA double-strand breaks, in conjunction with SLX4 Not functional in the nucleotide excision repair pathway Not functional in the nucleotide excision repair pathway Not functional in the nucleotide excision repair pathway","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P07992/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ERCC1","classification":"Not Classified","n_dependent_lines":74,"n_total_lines":1208,"dependency_fraction":0.061258278145695365},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CDC7","stoichiometry":10.0},{"gene":"CDK7","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ERCC1","total_profiled":1310},"omim":[{"mim_id":"620956","title":"ZINC FINGER C3H1 DOMAIN-CONTAINING PROTEIN; ZFC3H1","url":"https://www.omim.org/entry/620956"},{"mim_id":"618439","title":"UBIQUITIN-SPECIFIC PROTEASE 45; USP45","url":"https://www.omim.org/entry/618439"},{"mim_id":"618038","title":"SHORTAGE IN CHIASMATA 1; SHOC1","url":"https://www.omim.org/entry/618038"},{"mim_id":"615823","title":"SLX1 HOMOLOG B, STRUCTURE-SPECIFIC ENDONUCLEASE SUBUNIT; SLX1B","url":"https://www.omim.org/entry/615823"},{"mim_id":"615822","title":"SLX1 HOMOLOG A, STRUCTURE-SPECIFIC ENDONUCLEASE SUBUNIT; SLX1A","url":"https://www.omim.org/entry/615822"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ERCC1"},"hgnc":{"alias_symbol":["RAD10"],"prev_symbol":[]},"alphafold":{"accession":"P07992","domains":[{"cath_id":"3.40.50.10130","chopping":"100-220","consensus_level":"high","plddt":94.876,"start":100,"end":220},{"cath_id":"1.10.150.20","chopping":"230-289","consensus_level":"high","plddt":90.3028,"start":230,"end":289}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07992","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07992-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07992-F1-predicted_aligned_error_v6.png","plddt_mean":76.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ERCC1","jax_strain_url":"https://www.jax.org/strain/search?query=ERCC1"},"sequence":{"accession":"P07992","fasta_url":"https://rest.uniprot.org/uniprotkb/P07992.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07992/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07992"}},"corpus_meta":[{"pmid":"17314339","id":"PMC_17314339","title":"DNA 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Significant amino acid sequence homology was found between ERCC1 and the yeast excision repair protein RAD10, particularly in a region with structural similarity to DNA-binding domains.\",\n      \"method\": \"DNA-mediated gene transfer, cDNA cloning, sequence analysis, complementation assay in UV-sensitive CHO mutant 43-3B\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct complementation in repair-deficient cells, sequence analysis, foundational cloning paper replicated by many subsequent studies\",\n      \"pmids\": [\"2420469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"The yeast RAD10 gene (ortholog of ERCC1) is required for the incision step of nucleotide excision repair of UV-damaged DNA. A genomic deletion of RAD10 does not affect viability but causes high UV sensitivity.\",\n      \"method\": \"Genetic complementation (transformation of rad10 mutants), nucleotide sequencing, UV sensitivity assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic complementation with defined phenotypic readout, foundational work replicated in multiple subsequent studies\",\n      \"pmids\": [\"3912171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"RAD10 protein was purified from yeast and shown to be a DNA-binding protein with strong preference for single-stranded DNA. RAD10 promotes renaturation (annealing) of complementary DNA strands.\",\n      \"method\": \"Protein purification, DNA-binding assay, strand annealing assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified recombinant protein, in vitro biochemical characterization with multiple assays\",\n      \"pmids\": [\"1741062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"RAD10 is required for mitotic recombination in yeast; the rad10 deletion reduced intrachromosomal recombination at direct repeats and lowered efficiency of homologous integration of linear DNA. RAD1 and RAD10 function together in the same recombination pathway, distinct from the RAD52 pathway.\",\n      \"method\": \"Genetic epistasis analysis, recombination frequency assay in yeast deletion mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis with defined pathway placement, replicated by multiple subsequent studies\",\n      \"pmids\": [\"2188090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"RAD1 and RAD10 proteins form a stable, specific complex in vivo (shown by co-immunoprecipitation) and in vitro. The interaction is mediated by C-terminal regions of both proteins, is resistant to 1 M NaCl and low SDS, and is essential for DNA repair and recombination activities (a rad1 mutant defective in RAD10 binding is also defective in repair and recombination).\",\n      \"method\": \"Co-immunoprecipitation from yeast cell extracts, in vitro co-IP, hydroxylamine mutagenesis to identify interaction-defective mutant\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reciprocal Co-IP in vivo and in vitro, mutagenesis confirming functional requirement, replicated by multiple labs\",\n      \"pmids\": [\"1518857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The RAD1-RAD10 complex constitutes a single-stranded DNA endonuclease; purified Rad1 and Rad10 together specifically degrade single-stranded DNA by an endonucleolytic mechanism.\",\n      \"method\": \"Protein purification, in vitro endonuclease assay on single-stranded DNA substrates\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified proteins reconstituted in vitro, enzymatic activity directly demonstrated\",\n      \"pmids\": [\"8479526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"ERCC1 co-corrects NER defects of rodent group 1, group 4, and XP-F cell extracts; group 1-correcting activity has a native molecular mass of ~100 kDa and contains the 33 kDa ERCC1 polypeptide together with XPF/ERCC4 correcting activity, establishing that ERCC1 exists as a functional heterodimeric complex with XPF.\",\n      \"method\": \"In vitro NER reconstitution, biochemical fractionation, immunoblotting, complementation of cell-free extracts\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with cell-free extracts, biochemical fractionation, multiple orthogonal methods\",\n      \"pmids\": [\"8253090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Rad1-Rad10 complex forms in the yeast cell nucleus; the Rad10-binding domain of Rad1 maps to amino acids 809-997, and the Rad1-binding domain of Rad10 maps to amino acids 90-210. These domains are hydrophobic and evolutionarily conserved. No interaction was detected between human ERCC1 and yeast Rad1.\",\n      \"method\": \"Two-hybrid system (in vivo nuclear interaction), domain mapping\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two-hybrid system demonstrating nuclear complex and domain mapping, single lab\",\n      \"pmids\": [\"8361362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Purified Rad1/Rad10 complex has endonuclease activity on single-stranded DNA (preferentially) and negatively supercoiled double-stranded DNA; it produces 3'-OH and 5'-phosphate termini. The complex lacks exonuclease activity and does not preferentially cleave UV-irradiated DNA. Rad1 and Rad10 associate in a 1:1 stoichiometric complex of ~190 kDa.\",\n      \"method\": \"Protein purification, in vitro endonuclease assay, substrate specificity analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified recombinant proteins, comprehensive in vitro biochemical characterization\",\n      \"pmids\": [\"8253764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"XPA and ERCC1 specifically interact both in vivo (two-hybrid system) and in vitro (with recombinant proteins). Initial domain mapping identified regions in ERCC1 and XPA mediating this interaction, suggesting XPA may recruit the ERCC1-containing incision complex to damaged DNA.\",\n      \"method\": \"Yeast two-hybrid assay, in vitro binding with recombinant proteins, domain mapping\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — two orthogonal methods (two-hybrid + recombinant protein binding), replicated by subsequent studies\",\n      \"pmids\": [\"8197174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Purified Rad1-Rad10 cleaves model recombination and repair intermediates at duplex-single-strand junctions, specifically on the strand containing the 3' single-stranded tail, establishing that the complex incises DNA 5' to damaged bases during NER and cleaves specific recombination intermediates.\",\n      \"method\": \"In vitro endonuclease assay on model recombination and repair intermediate substrates with purified proteins\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with defined substrates and purified proteins, mechanistically informative\",\n      \"pmids\": [\"8091230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The XPF-ERCC1 heterodimer was purified from HeLa cells; it contains ERCC1 (38 kDa) and XPF (112 kDa), complementing NER defects in ERCC-1, ERCC-4, and XP-F cell-free extracts. The complex has endonuclease activity preferring single-stranded DNA and the single-stranded bubble region of duplex DNA; nicking of supercoiled DNA is stimulated by RPA in the presence of UV damage.\",\n      \"method\": \"Protein purification from HeLa cells, NER complementation assay, endonuclease activity assay, RPA stimulation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — native complex purification, multiple biochemical assays, complementation of multiple repair-deficient extracts\",\n      \"pmids\": [\"7559382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"RAD1 and RAD10 are uniquely required among NER genes for double-strand break-induced recombination; only rad1 and rad10 deletions (not rad2, rad3, rad14, rad7, rad16 mutations) caused ~20-fold reduction in gap repair and single-strand annealing at HO-induced DSBs, establishing a specific role for the Rad1-Rad10 complex in removing nonhomologous sequences from DSB ends.\",\n      \"method\": \"Genetic epistasis with HO endonuclease-induced DSBs, recombination frequency measurement in yeast deletion mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis screen across nine NER genes, clear pathway specificity established, replicated by multiple labs\",\n      \"pmids\": [\"7891718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Purified Rad1-Rad10 incises bubble structure DNA at the 5' side of the unpaired region. When co-incubated with XPG, incisions occurred at both sides of the bubble, reconstituting the dual incision step of NER. Rad1-Rad10 was unable to resolve synthetic Holliday junctions (negative finding regarding previously proposed junction resolution activity).\",\n      \"method\": \"In vitro incision assay with purified Rad1-Rad10 and XPG on synthetic bubble substrates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted dual incision with purified proteins, mechanistically defining 5' incision role, replicated finding\",\n      \"pmids\": [\"7559571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"MSH2 and MSH3 mismatch repair proteins function in the RAD1-RAD10 recombination pathway; msh3 mutations have an effect on recombination similar to rad1/rad10 mutations, and epistasis analysis places MSH2 and MSH3 in the RAD1-RAD10 pathway of mitotic recombination.\",\n      \"method\": \"Genetic epistasis analysis, recombination frequency measurement in yeast deletion mutants\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple alleles, single lab\",\n      \"pmids\": [\"8849883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"RPA and ERCC1 both bind to distinct, non-overlapping regions of XPA and can form a ternary RPA-XPA-ERCC1 complex in vitro. The KD of RPA for XPA is 1.9×10⁻⁸ M and of ERCC1 for XPA is 2.5×10⁻⁷ M. RPA binds XPA first (sequentially) and facilitates subsequent ERCC1 binding.\",\n      \"method\": \"In vitro binding assays, surface plasmon resonance, domain mapping, ternary complex detection\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative binding constants by SPR, ternary complex demonstrated in vitro, domain mapping, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"8972858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Recombinant ERCC1-XPF purified from insect cells cleaves stem-loop, splayed arm, and flap substrates at duplex-single-strand junctions, removing 3' protruding single-stranded arms; cleavage requires divalent cations (optimal in 0.2 mM Mn²⁺), a minimum of 4-8 unpaired nucleotides, and a single-stranded arm (3' or 5'). All incisions occur in the duplex strand at the 5' side of the junction, 2-8 nt from the junction, independent of other proteins (e.g., RPA).\",\n      \"method\": \"In vitro endonuclease assay with purified recombinant ERCC1-XPF on defined substrate structures, divalent cation requirement analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified recombinant complex, comprehensive substrate specificity analysis with multiple substrate types and biochemical conditions\",\n      \"pmids\": [\"9525876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ERCC1 and XPF are mutually dependent for stability in mammalian cells. Separately produced ERCC1 and XPF can reconstitute functional ERCC1-XPF when combined, establishing that the individual subunits can fold independently. ERCC1 alone showed partial NER repair activity in ERCC1-defective extracts due to trace XPF present. ERCC1 lacking the first 88 amino acids retained function. Sequence comparison revealed homology between the C-terminal regions of ERCC1 and XPF, suggesting an ancient gene duplication.\",\n      \"method\": \"Recombinant protein expression in E. coli, NER complementation assay with cell-free extracts, immunoassay for XPF levels\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution from separately produced subunits, functional NER assay, multiple orthogonal methods\",\n      \"pmids\": [\"11160918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Rad1-Rad10 (ERCC1-XPF ortholog) and Tdp1 function as redundant primary pathways for repair of Top1 replication damage in yeast; tdp1 rad1 double mutants are highly sensitive to camptothecin and show a TOP1-dependent growth defect. Both pathways feed into RAD52/RAD51/RAD50-dependent recombination equally. The Rad1-Rad10 pathway also requires RAD59 and SRS2 and is independent of other NER genes.\",\n      \"method\": \"Genetic epistasis analysis, camptothecin sensitivity assay, synthetic lethality analysis in yeast deletion mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — extensive genetic epistasis across multiple pathways, clear pathway placement, replicated findings\",\n      \"pmids\": [\"12368472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Endogenous DNA abasic sites cause synthetic lethality in yeast lacking Apn1, Apn2, and Rad1/Rad10 (or Rad1), establishing that Rad1-Rad10 processes 3'-blocked single-strand breaks arising from abasic site processing under physiological conditions.\",\n      \"method\": \"Genetic synthetic lethality analysis, bacterial complementation (Nfo expression), epistasis with DNA glycosylase mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic combinations tested, mechanistic pathway established, replicated by related studies\",\n      \"pmids\": [\"12032096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Rad1-Rad10 nuclease is required for removal of 3'-blocked termini from oxidative DNA strand breaks; yeast Rad1-Rad10 nuclease cleaves DNA with a 3'-phosphoglycolate terminus, and three pathways (Apn1, Apn2, Rad1-Rad10) remove 3'-blocked termini from H₂O₂-induced strand breaks.\",\n      \"method\": \"In vitro nuclease assay on 3'-phosphoglycolate-terminated substrate, genetic epistasis in yeast deletion mutants, H₂O₂ sensitivity assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical cleavage assay plus supporting genetic data, novel substrate activity demonstrated\",\n      \"pmids\": [\"15371342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"XPF/ERCC1 is stably associated with hRad52 in human cell-free extracts; the interaction is direct, mediated by the N-terminal domain of hRad52 and XPF. Complex formation stimulates XPF/ERCC1 endonuclease activity and simultaneously attenuates hRad52 strand annealing activity.\",\n      \"method\": \"Co-immunoprecipitation from cell-free extracts, direct binding assay with recombinant proteins, domain mapping, endonuclease activity assay, strand annealing assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reciprocal Co-IP plus direct binding with purified proteins plus functional assays, multiple orthogonal methods\",\n      \"pmids\": [\"14734547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ERCC1 physically interacts with MSH2 complexes in HeLa cell extracts, and suppression of ERCC1 increases sensitivity to cisplatin (but not UV) in XPA-deficient cells in an MSH2-dependent manner, establishing a co-operative role of ERCC1 and MSH2 in cisplatin ICL resistance independent of NER. The ERCC1 region required for MSH2 co-immunoprecipitation maps to amino acids 184-260, overlapping with the XPF-binding domain.\",\n      \"method\": \"RNA interference, co-immunoprecipitation from HeLa extracts, domain mapping by tagged ERCC1, cisplatin sensitivity assay in XPA-deficient cells\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, RNAi epistasis across multiple cell lines, domain mapping, multiple orthogonal methods\",\n      \"pmids\": [\"14706347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ERCC1-XPF endonuclease is required for DSB repair in mammals; ERCC1-XPF-deficient fibroblasts are hypersensitive to gamma irradiation with persistent γH2AX foci. In vitro DSB repair of substrates with 3' overhangs generates large deletions in the absence of ERCC1-XPF. Ercc1⁻/⁻ Ku86⁻/⁻ double mutant fibroblasts are more sensitive to irradiation than single mutants, indicating ERCC1-XPF participates in a Ku86-independent end-joining pathway.\",\n      \"method\": \"Gamma irradiation sensitivity assay, γH2AX foci analysis, in vitro DSB repair assay, mouse epistasis genetics (Ercc1/Ku86 double mutant)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple cell and mouse genetic models, in vitro repair assay, multiple orthogonal methods in single study\",\n      \"pmids\": [\"18541667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ERCC1/XPF limits LINE-1 retrotransposition; reduction of XPF in human cells increased retrotransposition, and complementation of ERCC1-deficiency in hamster cells reduced retrotransposition, establishing that the ERCC1-XPF heterodimer processes flap intermediates generated during LINE-1 retrotransposition.\",\n      \"method\": \"siRNA knockdown, genetic complementation of ERCC1-deficient hamster cells, retrotransposition reporter assay\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two complementary genetic approaches (KD and complementation), single lab\",\n      \"pmids\": [\"18396111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Saw1 protein was identified as required for Rad1/Rad10-dependent processing of recombination intermediates in SSA; Saw1 physically interacts with Rad1/Rad10, Msh2/Msh3, and Rad52, and saw1 mutants defective in Rad1 interaction (but retaining Rad52/Msh2 interaction) are defective in 3' flap removal. Deletion of SAW1 abolished Rad1 association at SSA intermediates in vivo.\",\n      \"method\": \"Microarray-based genetic screen, physical interaction assays, ChIP, SSA assay in yeast\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (screen, physical interaction, ChIP, functional assay), clear mechanistic placement\",\n      \"pmids\": [\"18471978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"XPF-ERCC1 is required for ICL unhooking and for stable localization of monoubiquitinated FANCD2 to chromatin at ICL sites; in XPF-ERCC1-deficient cells, FANCD2 monoubiquitination occurs but its chromatin association is dramatically reduced and ICL-induced FANCD2 foci are significantly lower, establishing that ICL unhooking by XPF-ERCC1 is necessary for FA pathway activation and subsequent HR-mediated DSB repair.\",\n      \"method\": \"FANCD2 monoubiquitination assay, chromatin fractionation, immunofluorescence foci analysis in Ercc1⁻/⁻ and XPF-deficient cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple cell systems (mouse, human, hamster), chromatin fractionation plus immunofluorescence, epistasis with FA pathway\",\n      \"pmids\": [\"19805513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mec1/Tel1-dependent phosphorylation of Slx4 at Thr113 is required for efficient cleavage of 3' non-homologous DNA tails by Rad1-Rad10 during SSA and HR. Slx4 is recruited to 3' NH tails during DSB repair independently of its phosphorylation, but phosphorylation is required for Rad1-Rad10 cleavage activity at these sites.\",\n      \"method\": \"DSB repair assay, phosphorylation site mutagenesis, ChIP, epistasis with mec1/tel1 mutants in yeast\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — site-specific mutagenesis, ChIP in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"20382573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Multiple DNA binding domains of ERCC1-XPF cooperate for NER activity; mutations in the HhH domain of ERCC1 and the nuclease domain of XPF abolish cleavage on model substrates. Mutations in multiple binding domains are needed to diminish NER activity, suggesting protein-protein interactions in the NER incision complex compensate for individual DNA binding defects. ICL repair requires tighter substrate binding than NER (more sensitive to DNA-binding mutations).\",\n      \"method\": \"In vitro cleavage assay on model substrates, NER activity assay in cell extracts and in vivo with domain mutants, mitomycin C and UV sensitivity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure-function analysis with multiple mutants, in vitro and in vivo complementary assays\",\n      \"pmids\": [\"22547097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rad1-Rad10 nuclease promotes formation of crossover recombinants between dispersed repeat sequences (ectopic sequences); all three nucleases (Rad1-Rad10, Mus81-Mms4, Yen1) participate in processing recombination intermediates between dispersed repeats, and Rad1-Rad10 promotes crossovers via a mechanism involving clipping and subsequent resolution of a Holliday junction-containing intermediate.\",\n      \"method\": \"Genetic analysis in yeast deletion mutants, measurement of crossover and noncrossover recombinants, detection of joint molecule intermediates\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with triple mutant, joint molecule detection, single lab\",\n      \"pmids\": [\"22885325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Saw1 is a structure-specific DNA binding protein with high affinity for splayed arm and 3'-flap DNAs; Saw1 directly interacts with Rad1 to facilitate targeting of Rad1/Rad10 to 3'-tailed substrates in vivo and in vitro, and enhances 3'-tail cleavage by Rad1/Rad10 in a purified system. The order of assembly is: Saw1 (structure-specific DNA binding) → recruits Rad1/Rad10 → cleavage of 3' tails.\",\n      \"method\": \"Purified protein DNA-binding assay, in vitro cleavage assay with purified proteins, ChIP, physical interaction assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with purified proteins, in vitro and in vivo complementary methods, mechanistic order of assembly defined\",\n      \"pmids\": [\"23299942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Only one of four ERCC1 protein isoforms (the full-length isoform) has full capacity for nucleotide excision repair and cisplatin resistance; none of the 16 commercially available ERCC1 antibodies (including 8F1) can distinguish among the four isoforms, limiting their diagnostic utility.\",\n      \"method\": \"NER functional assay for each isoform, cisplatin resistance assay, antibody epitope mapping for 16 antibodies\",\n      \"journal\": \"The New England journal of medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct functional assay for each isoform, comprehensive antibody panel testing, single large study with multiple orthogonal methods\",\n      \"pmids\": [\"23514287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Small molecule NSC 130813 disrupts the ERCC1-XPF protein-protein interaction in cells and synergizes with cisplatin and mitomycin C; the compound binds directly to the XPF domain responsible for ERCC1 interaction (demonstrated by Biacore surface plasmon resonance), increases UV-mediated cytotoxicity, and modifies DNA repair (γH2AX staining).\",\n      \"method\": \"Virtual screening, Biacore binding assay, proximity ligation assay, cytotoxicity assay, γH2AX analysis\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by SPR, cellular interaction disruption by PLA, single lab\",\n      \"pmids\": [\"23580445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"XPF-ERCC1 cooperates with SLX4/FANCP to perform unhooking incisions during replication-coupled ICL repair in Xenopus egg extracts; efficient recruitment of XPF-ERCC1 and SLX4 to the ICL depends on FANCD2 monoubiquitination.\",\n      \"method\": \"Xenopus egg extract ICL repair assay, immunodepletion, recruitment assay at ICL sites\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted replication-coupled ICL repair in cell-free system, immunodepletion, mechanistic order established\",\n      \"pmids\": [\"24726325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"USP45 deubiquitylase associates with ERCC1 via a short acidic motif outside the USP45 catalytic domain, deubiquitylates ERCC1 in vitro, and is required for ERCC1 translocation to UV-damage-induced subnuclear foci. USP45 knockout cells have elevated ubiquitylated ERCC1, are hypersensitive to UV and ICL agents (similar to ERCC1-deficient cells), and show reduced UV-induced DNA damage repair.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deubiquitylation assay, USP45 knockout cells, immunofluorescence foci assay, UV/ICL sensitivity assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro deubiquitylation assay, KO cells with defined phenotype, localization assay, multiple orthogonal methods\",\n      \"pmids\": [\"25538220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"EGFR and ERCC1 interact upon ionizing radiation (IR)-induced DNA damage; this interaction was identified by mass spectrometry of the EGFR interactome, validated biochemically and by proximity ligation assay. Depletion of ERCC1 or EGFR impairs IR-induced DNA repair (comet assay, γH2AX foci), and this EGFR-dependent repair pathway operates independently of DNA-PKcs.\",\n      \"method\": \"Mass spectrometry of EGFR interactome, biochemical co-immunoprecipitation, proximity ligation assay, siRNA knockdown, comet assay, γH2AX foci analysis in DNAPKcs-deficient cells\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry plus PLA validation, functional knockdown data, single lab\",\n      \"pmids\": [\"24780295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ERCC1-XPF participates in repair of Top1-attached nick DNA lesions; ERCC1-XPF shows nuclease activity on 3'-phosphotyrosyl bond nick-containing DNA in the presence of RPA. ERCC1-XPF and RPA form a DNA-protein complex on nick DNA substrates in vitro, co-localize in camptothecin-treated cells, and DNA repair synthesis of Tyr-nick DNA lesions occurs with NER factors including ERCC1-XPF.\",\n      \"method\": \"In vitro nuclease assay on Tyr-nick DNA substrate, electrophoretic mobility shift assay, co-localization by immunofluorescence, in vitro repair synthesis assay\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assays with defined substrate, co-localization in vivo, single lab\",\n      \"pmids\": [\"26025908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ERCC1-XPF complex interacts with the insulator binding protein CTCF, cohesin subunits SMC1A and SMC3, and MBD2 in mouse liver nuclei; ERCC1-XPF co-localizes with ATRX at promoters and imprinting control regions (ICRs) of imprinted genes during postnatal hepatic development. Loss of Ercc1 or DNA crosslink damage triggers CTCF localization to heterochromatin, dissociation of CTCF-cohesin and ATRX from ICRs, altered histone marks, and aberrant developmental expression of imprinted genes without altering DNA methylation.\",\n      \"method\": \"In vivo biotinylation tagging in mice, co-immunoprecipitation, ChIP, gene expression analysis in Ercc1 knockout and MMC-treated mice\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo biotinylation tagging, ChIP, mouse KO model, multiple orthogonal methods identifying novel non-repair function\",\n      \"pmids\": [\"28368372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Two rad1 mutations that disrupt XPF-Rpa1 interactions selectively disable non-NER functions (ICL repair, direct repeat recombination) while retaining UV lesion repair activity; analogous mutations in XPF also compromised XPF-Rpa1 and XPF-Slx4 interactions, and these cells are proficient in NER but deficient in ICLR and direct repeat recombination, establishing distinct interaction surfaces for NER vs. non-NER activities.\",\n      \"method\": \"Site-directed mutagenesis, UV and ICL sensitivity assays, co-immunoprecipitation, SSA and ICLR assays in yeast and human cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — separation-of-function mutations, orthogonal assays for NER vs. non-NER activities, complementary yeast and human cell data\",\n      \"pmids\": [\"29795289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ERCC1/XPF is required for repair of DSBs containing DNA secondary structures, including AT-rich sequences from common fragile sites and G-quadruplexes (G4s); XPF inactivation is synthetically lethal with FANCM deficiency, and ERCC1/XPF-deficient cells are sensitized to G4-interacting compounds.\",\n      \"method\": \"siRNA knockdown and CRISPR knockout of XPF, DSB repair assays, synthetic lethality assay with FANCM, G4-interacting compound sensitivity assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic approaches with defined substrates and compounds, single lab, multiple repair pathway readouts\",\n      \"pmids\": [\"31153042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SLX4IP binds simultaneously to SLX4 and XPF-ERCC1; disruption of one interaction also disrupts the other. SLX4IP binding to both proteins promotes the SLX4-XPF-ERCC1 interaction, especially after DNA damage, and maintains SLX4IP protein stability. SLX4IP depletion sensitizes cells to ICL-inducing agents and causes G2/M accumulation.\",\n      \"method\": \"Co-immunoprecipitation, domain interaction mapping, siRNA knockdown, ICL sensitivity assay, cell cycle analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, functional knockdown assays, single lab\",\n      \"pmids\": [\"31495888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TGFβ treatment leads to enhanced NER of bulky DNA damage via increased interaction between ERCC1-XPF and ERCC1-XPA and their nuclear localization; this effect requires intact TGFβ signaling (Smad4-dependent) and is abolished by ERCC1 knockdown.\",\n      \"method\": \"RNAi, co-immunoprecipitation of ERCC1-XPF and ERCC1-XPA, nuclear localization analysis, DNA damage repair assay (NER)\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating increased interaction, RNAi epistasis, single lab\",\n      \"pmids\": [\"30418489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The ERCC1 R156W missense mutation disrupts a salt bridge below the XPA-binding pocket, causing dramatically reduced ERCC1 and XPF protein levels; mutant ERCC1 weakly interacts with NER and ICL repair proteins, shows diminished recruitment to DNA damage, and results in strongly reduced NER activity and increased chromosome breakage by crosslinkers. DSB repair was relatively normal in these patient-derived cells.\",\n      \"method\": \"Patient-derived fibroblasts and knock-in epithelial cells, protein interaction assays, NER activity assay, chromosome breakage assay, recruitment to DNA damage (immunofluorescence)\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient-derived cells plus knock-in model, multiple functional assays, clear structure-function relationship\",\n      \"pmids\": [\"33315086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"XAB2 splicing factor interacts with ERCC1-XPF and XPG endonucleases outside of NER; the trimeric XAB2-ERCC1-XPF-XPG complex binds RNA:DNA hybrids under conditions favoring R-loop formation. XAB2 depletion leads to R-loop formation and DNA damage, and transcription-blocking DNA lesions trigger release of XAB2 from RNA targets.\",\n      \"method\": \"In vivo biotinylation tagging in mice, co-immunoprecipitation, RNA:DNA hybrid binding assay, siRNA knockdown, R-loop detection\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo tagging approach, Co-IP, RNA:DNA hybrid binding assay, functional depletion studies, multiple orthogonal methods\",\n      \"pmids\": [\"34039990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ERCC1 knockdown (but not XPF knockdown) causes multinucleation in human hepatocellular carcinoma cells (Huh7), HeLa, and human fibroblasts, with defects in metaphase and cytokinesis. This phenotype was rescued by ERCC1 overexpression and occurred in XPF-mutant fibroblasts after ERCC1 knockdown, but not after XPF knockdown. Other NER gene knockdowns (XPC, XPF) did not cause multinucleation, indicating an NER-independent, XPF-independent role for ERCC1 in mitotic progression.\",\n      \"method\": \"siRNA knockdown, ERCC1 overexpression rescue, live cell imaging, cell cycle analysis, phenotypic characterization in multiple cell lines\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell lines tested, rescue by overexpression, negative controls (XPF KD, XPC KD), single lab\",\n      \"pmids\": [\"21839691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SNRPA splicing factor controls alternative splicing of ERCC1 exon 8; SNRPA depletion causes ERCC1 exon 8 skipping, reduced ERCC1-XPF complex formation, and reversal of cisplatin resistance in lung adenocarcinoma cells. SNRPA overexpression has the opposite effect. m6A reader IGF2BP1 and RNA stabilizer ELAVL1 bind SNRPA mRNA and promote SNRPA-dependent ERCC1-E8(+) expression and cisplatin resistance.\",\n      \"method\": \"CRISPR/Cas9 knockout, shRNA knockdown, overexpression, RT-PCR for splicing, Western blot for ERCC1-XPF complex, cisplatin sensitivity assay, mouse xenograft model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic tools, in vitro and in vivo (xenograft) validation, single lab\",\n      \"pmids\": [\"39555714\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ERCC1 functions exclusively as the obligate partner subunit of the ERCC1-XPF (XPF/ERCC4) heterodimeric structure-specific endonuclease, which incises DNA at duplex/single-strand junctions on the strand bearing the 5' side of the junction; this activity—requiring divalent cations and a minimum of 4–8 unpaired nucleotides—executes the 5' incision in nucleotide excision repair, unhooks interstrand crosslinks (in cooperation with SLX4/FANCP and dependent on FANCD2 ubiquitylation), removes 3' non-homologous tails during single-strand annealing and gene conversion (facilitated by Saw1/SLX4 scaffold proteins and regulated by Mec1/Tel1 phosphorylation of SLX4), and processes 3'-blocked strand breaks from oxidative damage; ERCC1's stability and recruitment to DNA damage depend on its interaction with XPF (mutual stabilization), on deubiquitylation by USP45, and on XPA-mediated loading onto damage sites (where ERCC1 also forms a sequential ternary complex with RPA); additionally, ERCC1-XPF has non-repair roles including interacting with CTCF/cohesin to silence imprinted genes, with hRad52 to process recombination intermediates, with XAB2 to resolve R-loops, and with EGFR in ionizing radiation-induced strand-break repair, while ERCC1 alone (independent of XPF) is required for proper mitotic progression and cytokinesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ERCC1 is the obligate non-catalytic partner subunit of the ERCC1-XPF structure-specific endonuclease, a heterodimer that incises duplex DNA on the 5' side of duplex/single-strand junctions and thereby executes the 5' incision step of nucleotide excision repair (NER) and a broad set of related DNA-processing reactions [#6, #11, #16]. The protein was first cloned by complementation of repair-deficient CHO cells and recognized as the homolog of yeast RAD10, whose product is a single-stranded-DNA-binding protein required for the incision step of NER [#0, #1, #2]. ERCC1/RAD10 functions only in stable 1:1 complex with XPF/RAD1, an interaction mediated by conserved C-terminal regions and required for both nuclease activity and complex assembly; the two subunits are mutually dependent for stability in mammalian cells [#4, #8, #17]. The reconstituted complex cleaves stem-loop, splayed-arm, bubble and flap substrates at the 5' side of the junction, requiring divalent cations and a minimum of 4-8 unpaired nucleotides, and cooperates with XPG to perform the dual incision of NER [#13, #16]. Multiple DNA-binding domains, including the ERCC1 HhH domain and the XPF nuclease domain, act cooperatively, and distinct interaction surfaces separate NER from non-NER activities [#28, #38]. Recruitment to damage is governed by ERCC1's interactions with XPA and RPA, which form a sequential ternary RPA-XPA-ERCC1 complex that loads the incision complex onto lesions, while ERCC1 stability and translocation to UV-damage foci depend on deubiquitylation by USP45 [#9, #15, #34]. Beyond NER, ERCC1-XPF removes 3' non-homologous tails during single-strand annealing and recombination through scaffolds such as Saw1/SLX4 (the latter regulated by Mec1/Tel1 phosphorylation), unhooks interstrand crosslinks in cooperation with SLX4/FANCP downstream of FANCD2 monoubiquitination, processes 3'-blocked oxidative and Top1-derived strand breaks, and participates in double-strand break repair [#12, #25, #26, #27, #33, #20, #23]. Non-repair roles include silencing of imprinted genes through CTCF/cohesin/ATRX, resolution of R-loops via the splicing factor XAB2, and modulation of hRad52 recombination activity [#37, #43, #21]. ERCC1 also has an XPF-independent function in mitotic progression and cytokinesis [#44]. The ERCC1 R156W mutation, which destabilizes ERCC1 and XPF and impairs damage recruitment, causes a human NER/crosslink-repair-deficiency disorder [#42].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Establishing the molecular identity of the human repair gene: cloning ERCC1 and recognizing its homology to yeast RAD10 created the framework for understanding it as a conserved NER factor.\",\n      \"evidence\": \"cDNA cloning and complementation of UV/mitomycin-C-sensitive CHO mutants, with sequence comparison to RAD10\",\n      \"pmids\": [\"2420469\", \"3912171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cloning alone did not define the biochemical activity or partner of ERCC1\", \"The functional transcript was identified but the protein's enzymatic role was unknown\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Defining the functional unit: RAD1-RAD10 (XPF-ERCC1) forms an obligate, salt-resistant complex that is itself a single-stranded-DNA endonuclease, answering whether the subunits act alone or together.\",\n      \"evidence\": \"Reciprocal Co-IP in vivo and in vitro, interaction-defective mutants, purified-protein endonuclease assays in yeast\",\n      \"pmids\": [\"1518857\", \"8479526\", \"1741062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not yet define the precise junction geometry of cleavage\", \"Substrate range beyond ssDNA was unresolved\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Placing the activity in NER mechanistically: the complex incises at the 5' side of bubble structures and, with XPG, reconstitutes the dual incision of NER, resolving which incision the complex performs.\",\n      \"evidence\": \"Native HeLa complex purification, in vitro incision/dual-incision assays on bubble substrates, RPA stimulation\",\n      \"pmids\": [\"7559382\", \"7559571\", \"8253090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain how the complex is targeted to lesions in cells\", \"Ruled out Holliday junction resolution but left recombination intermediate roles open\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defining damage targeting: ERCC1 and RPA bind distinct regions of XPA to form a sequential RPA-XPA-ERCC1 ternary complex, explaining how the incision nuclease is recruited to lesions.\",\n      \"evidence\": \"Yeast two-hybrid, recombinant binding, SPR affinity measurements and domain mapping\",\n      \"pmids\": [\"8197174\", \"8972858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the in vivo order of assembly at chromatin lesions\", \"Regulation of recruitment by post-translational modification was unaddressed\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Generalizing substrate specificity: purified recombinant ERCC1-XPF cleaves diverse junction substrates 5' of the junction with defined cation and unpaired-nucleotide requirements, establishing it as a general structure-specific endonuclease.\",\n      \"evidence\": \"In vitro endonuclease assays on stem-loop, splayed-arm and flap substrates with purified recombinant complex\",\n      \"pmids\": [\"9525876\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not connect each in vitro substrate to a specific in vivo pathway\", \"Cofactor requirements in cells were not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Expanding pathway scope: genetic and biochemical work showed Rad1-Rad10/ERCC1-XPF processes recombination intermediates, removes 3'-blocked termini from oxidative breaks, and modulates hRad52, defining non-NER DNA-processing roles.\",\n      \"evidence\": \"Yeast epistasis and synthetic lethality, in vitro cleavage of 3'-phosphoglycolate substrates, Co-IP and functional assays with hRad52\",\n      \"pmids\": [\"7891718\", \"12368472\", \"12032096\", \"15371342\", \"14734547\", \"14706347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Recruitment factors for non-NER substrates were not yet identified\", \"Whether these roles were direct nuclease functions or scaffolding was not always resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying recruitment scaffolds for recombination/SSA: Saw1 and Slx4 target Rad1-Rad10 to 3' tails, with Mec1/Tel1 phosphorylation of Slx4 licensing cleavage, defining how the nuclease is directed to recombination intermediates.\",\n      \"evidence\": \"Genetic screen, ChIP, physical interaction mapping, SSA assays and phosphosite mutagenesis in yeast\",\n      \"pmids\": [\"18471978\", \"20382573\", \"23299942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The mammalian equivalents of all scaffold interactions were not fully mapped\", \"How phosphorylation activates cleavage mechanistically was unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Integrating into the Fanconi/ICL pathway and defining its regulation: XPF-ERCC1 cooperates with SLX4/FANCP for ICL unhooking downstream of FANCD2 monoubiquitination, and USP45 deubiquitylation controls ERCC1 stability and damage localization.\",\n      \"evidence\": \"Xenopus egg-extract replication-coupled ICL repair with immunodepletion; FANCD2 chromatin/foci assays; in vitro deubiquitylation and USP45 knockout cells\",\n      \"pmids\": [\"24726325\", \"19805513\", \"25538220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The catalytic step of unhooking versus scaffold recruitment was not fully separated\", \"Other regulatory modifications of ERCC1 were not characterized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Separating NER from non-NER functions genetically: mutations disrupting XPF-Rpa1 interactions abolish ICL repair and recombination while preserving NER, proving distinct interaction surfaces drive distinct pathways.\",\n      \"evidence\": \"Separation-of-function site-directed mutagenesis with NER, SSA and ICLR assays in yeast and human cells\",\n      \"pmids\": [\"29795289\", \"22547097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full structural basis for each interaction surface was not resolved\", \"How cells partition the complex between pathways was unaddressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Establishing non-repair functions and disease relevance: ERCC1-XPF silences imprinted genes via CTCF/cohesin/ATRX and resolves R-loops via XAB2, while the R156W mutation links ERCC1 destabilization to a human repair-deficiency disorder.\",\n      \"evidence\": \"In vivo biotinylation tagging, ChIP and KO mice for imprinting/R-loops; patient-derived and knock-in cells with NER and crosslinker assays\",\n      \"pmids\": [\"28368372\", \"34039990\", \"33315086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the imprinting and R-loop roles require nuclease activity is unclear\", \"The mechanistic basis of the XPF-independent mitotic role of ERCC1 is undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ERCC1 executes its XPF-independent role in mitotic progression and cytokinesis, and how the complex is partitioned among its many repair and non-repair functions in cells.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular partner identified for the XPF-independent mitotic function of ERCC1\", \"No structural model integrating NER, ICL and recombination interaction surfaces\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [5, 8, 10, 11, 13, 16, 20]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [5, 8, 16, 20]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 5, 16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [9, 15, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 34, 37]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [26, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6, 11, 13, 16, 23, 26]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [37, 43]}\n    ],\n    \"complexes\": [\"ERCC1-XPF endonuclease\", \"RPA-XPA-ERCC1 ternary complex\", \"SLX4-XPF-ERCC1\", \"XAB2-ERCC1-XPF-XPG\"],\n    \"partners\": [\"XPF\", \"XPA\", \"RPA\", \"SLX4\", \"hRad52\", \"MSH2\", \"USP45\", \"XAB2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":10,"faith_total":10,"faith_pct":100.0}}