{"gene":"RECQL","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1994,"finding":"RECQL encodes a 659-amino-acid ATP-dependent DNA helicase homologous to E. coli RecQ, localized predominantly to the nucleus of human fibroblasts, as confirmed by antibodies against synthetic N- and C-terminal peptides.","method":"cDNA cloning, reticulocyte lysate expression, immunofluorescence with antipeptide antibodies","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cloning plus direct localization experiment with antibody validation, single lab","pmids":["7961977"],"is_preprint":false},{"year":1997,"finding":"RECQL physically interacts with importin-alpha homologs Qip1 and Rch1 (but not hSrp1) through its putative NLS, establishing a mechanism for its nuclear import.","method":"Yeast two-hybrid screening, GST pulldown, co-precipitation from cell lysates","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus GST pulldown, single lab, two complementary methods","pmids":["9168958"],"is_preprint":false},{"year":2002,"finding":"RECQ1 unwinds DNA with 3′ to 5′ polarity, requires a 3′ single-stranded tail >10 nt to initiate unwinding, and its helicase activity on long substrates (>30 bp) is specifically stimulated by human RPA but not E. coli SSB.","method":"In vitro helicase assay with recombinant protein, polarity determination, substrate-length titration, SSB specificity comparison","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with defined substrates, multiple orthogonal substrate tests, replicated in subsequent studies","pmids":["12419808"],"is_preprint":false},{"year":2004,"finding":"RECQL1 forms dimers in solution (~158 kDa by gel filtration/DLS), unwinds short duplexes alone, requires hRPA for longer substrates, and directly binds the 70 kDa subunit of hRPA in a DNA-independent manner.","method":"Gel filtration, dynamic light scattering, in vitro helicase assay, far-western, ELISA, co-immunoprecipitation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biochemical methods (DLS, helicase assay, co-IP, ELISA, far-western) in one study","pmids":["15096578"],"is_preprint":false},{"year":2005,"finding":"RECQ1 catalyzes efficient strand annealing between complementary ssDNA molecules; ATP binding induces a conformational change that modulates this annealing activity, distinguishing it from the helicase mode.","method":"In vitro strand annealing assay, ATPase-deficient mutant analysis, DNA-binding assays with diverse substrates","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutants and diverse substrates, single lab but multiple orthogonal assays","pmids":["15899892"],"is_preprint":false},{"year":2005,"finding":"RECQ1 physically interacts with mismatch repair proteins MSH2/6 and exonuclease 1 in vivo (co-IP) and in vitro (purified proteins); MSH2/6 stimulates RECQ1 helicase activity and RECQ1 stimulates EXO1 incision activity.","method":"Co-immunoprecipitation from cell extracts, purified protein interaction assays, functional stimulation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal in vivo co-IP plus purified-protein functional assays, single lab","pmids":["15886194"],"is_preprint":false},{"year":2005,"finding":"RecQL1 is the predominant ATP-dependent Holliday junction branch migrator in human nuclear extracts; RNAi-mediated depletion of RecQL1 in HeLa cells increases sister chromatid exchange frequency.","method":"Nuclear extract fractionation, in vitro branch migration assay, siRNA knockdown with SCE measurement","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical fractionation showing predominance plus cellular knockdown phenotype, replicated by independent group","pmids":["16260474"],"is_preprint":false},{"year":2006,"finding":"RECQL-deficient mouse embryonic fibroblasts display aneuploidy, spontaneous chromosomal breakage, frequent translocations, hypersensitivity to ionizing radiation, elevated DNA damage load, and increased spontaneous SCEs, demonstrating a unique role in genomic stability.","method":"Mouse knockout, cytogenetic analysis, γ-H2AX assay, SCE assay, irradiation sensitivity assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple independent cellular phenotype readouts, replicated directionally by other labs","pmids":["17158923"],"is_preprint":false},{"year":2007,"finding":"Different quaternary structures of RECQ1 are associated with distinct enzymatic activities: higher-order oligomers (pentamers/hexamers) favor strand annealing, while lower-order oligomers (monomers/dimers) are required for DNA unwinding; ATP/ATPγS shifts equilibrium toward lower-order forms.","method":"Size exclusion chromatography, transmission electron microscopy, 3D EM reconstruction, ATPase-deficient mutant competition assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple structural and biochemical approaches including EM reconstruction and mutant competition assays in one study","pmids":["17227144"],"is_preprint":false},{"year":2007,"finding":"Human RECQ1 depletion renders cells sensitive to ionizing radiation and camptothecin, causes spontaneous γ-H2AX foci and elevated SCEs, and RECQ1 forms irradiation-induced nuclear foci, becomes phosphorylated upon DNA damage, and directly interacts with RAD51.","method":"siRNA knockdown, colony survival assay, immunofluorescence (γ-H2AX, RECQ1 foci), SCE assay, co-immunoprecipitation, direct protein interaction assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (knockdown, foci, co-IP, direct binding) in one study, corroborated by subsequent work","pmids":["18074021"],"is_preprint":false},{"year":2008,"finding":"RECQ1 has distinct substrate specificity from BLM: it cannot unwind G-quadruplexes or RNA-DNA hybrids, cannot substitute for BLM in model replication fork regression, but uniquely resolves immobile Holliday junctions lacking a homologous core; the N-terminal region (residues 1–56) is essential for oligomerization and HJ disruption activity.","method":"In vitro helicase assay with diverse substrates, N-terminal deletion mutagenesis, substrate competition assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with multiple substrates and domain-deletion mutagenesis in one study","pmids":["18448429"],"is_preprint":false},{"year":2008,"finding":"RECQ1 efficiently catalyzes unidirectional 3′→5′ DNA branch migration and disrupts D-loops formed by 5′-invading strands, representing a dead-end intermediate of homologous recombination.","method":"In vitro branch migration assay with synthetic substrates, D-loop disruption assay, polarity determination","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with defined substrates and polarity analysis, corroborated by independent subsequent study","pmids":["18495662"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of truncated human RECQ1 with Mg-ADP reveals conservation of all structural domains (RecA-like, zinc-binding, winged-helix) with distinct WH domain orientation versus E. coli RecQ; a prominent β-hairpin in the WH domain is identified as essential for DNA strand separation.","method":"X-ray crystallography, β-hairpin mutant functional analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mutagenesis validation","pmids":["19151156"],"is_preprint":false},{"year":2010,"finding":"The β-hairpin (with Y564 at tip) in the WH domain of RECQ1 is required for DNA unwinding, HJ resolution activity, dimer formation of truncated RECQ1, and tetramer formation of full-length RECQ1; tetramers are necessary for HJ resolution and strand annealing, while dimers favor DNA unwinding.","method":"Site-directed mutagenesis of full-length RECQ1, in vitro helicase/HJ/annealing assays, SEC/analytical ultracentrifugation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis coupled with functional assays and biophysical oligomeric state determination","pmids":["21059676"],"is_preprint":false},{"year":2010,"finding":"RECQ1 (and RECQ4) associate with replication origins in a cell cycle-regulated manner in unperturbed cells; RECQ1 is loaded at origins at onset of S phase, and its depletion reduces nascent origin DNA synthesis, origin firing frequency, and replication fork rates.","method":"ChIP at characterized replication origins, DNA fiber analysis, siRNA depletion, BrdU incorporation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP with multiple origins, DNA fiber analysis, and knockdown with quantitative replication readouts","pmids":["20065033"],"is_preprint":false},{"year":2012,"finding":"RECQ1 associates with PARP-1 in nuclear extracts and directly interacts with PARP-1 in vitro; RECQ1-deficient cells specifically hyperactivate PARP in response to H₂O₂ (but not in undamaged cells), and RECQ1 rapidly and reversibly recruits to chromatin upon oxidative stress before WRN.","method":"Co-immunoprecipitation, direct protein interaction assay, PARP activity measurement, chromatin fractionation/localization","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional cellular assays, single lab","pmids":["22542292"],"is_preprint":false},{"year":2012,"finding":"RECQ1 promotes strand exchange on synthetic stalled replication fork structures; it unwinds the leading strand of the fork (similar to WRN); stable RECQ1 depletion activates Chk1, hyper-phosphorylates RPA32, and causes chromosome condensation defects.","method":"In vitro strand exchange assay with fork substrates, siRNA knockdown, phospho-Chk1/RPA Western blot, chromosomal condensation analysis","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro reconstitution plus cellular depletion phenotypes, single lab","pmids":["23095637"],"is_preprint":false},{"year":2012,"finding":"RAD54, BLM, and RECQ1 promote branch migration preferentially in the 3′→5′ direction relative to the displaced ssDNA strand; helicase activity of BM proteins does not play a role in heterology bypass during branch migration.","method":"In vitro branch migration assay with RAD51/RecA-made joint molecules, polarity determination, heterology bypass assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined substrates, single lab","pmids":["22356911"],"is_preprint":false},{"year":2013,"finding":"RECQ1 is required for restart of TOP1-inhibitor-induced reversed replication forks; PARP1 poly(ADP-ribosyl)ation stabilizes forks in the regressed state and limits their restart by RECQ1, establishing a PARP1–RECQ1 regulatory axis at stalled forks.","method":"Biochemical fork restart assay, electron microscopy of replication intermediates, single-molecule DNA fiber analysis, PARP inhibitor treatment","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (EM, fiber analysis, biochemical assays) in one study with mechanistic dissection","pmids":["23396353"],"is_preprint":false},{"year":2013,"finding":"RECQ1 directly interacts with Ku70/80 (subunit of DNA-PK); RECQ1 depletion reduces DNA end-joining in cell-free extracts; RECQ1 unwinds Ku70/80-bound partial duplex DNA and modulates Ku70/80 DNA binding, implicating RECQ1 in NHEJ.","method":"Co-immunoprecipitation, purified protein binding assay, cell-free end-joining assay, in vitro helicase assay with Ku-bound substrates","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus purified-protein functional assays plus cell-free NHEJ assay, single lab","pmids":["23650516"],"is_preprint":false},{"year":2013,"finding":"RECQ1 is specifically enriched at common fragile sites FRA3B and FRA16D under replication stress (aphidicolin treatment); RECQ1 depletion attenuates checkpoint activation, increases aphidicolin sensitivity, and causes chromosomal instability, implicating RECQ1 in repair at stalled forks at fragile sites.","method":"ChIP-qPCR at defined replication origins and fragile sites, siRNA knockdown, aphidicolin sensitivity assay, chromosomal instability analysis","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus multiple cellular phenotype assays, single lab","pmids":["23601052"],"is_preprint":false},{"year":2014,"finding":"RECQL1 associates with telomeres in ALT cells, resolves telomeric D-loops and HJ substrates in vitro, physically and functionally interacts with TRF2 (which regulates its helicase activity on telomeric substrates), and is stimulated by POT1 on telomeric substrates with thymine glycol lesions; RECQL1 loss causes telomere dysfunction, shortening, and elevated T-SCEs.","method":"ChIP at telomeres, in vitro D-loop/HJ resolution assays, co-immunoprecipitation, helicase stimulation assay, telomere FISH/TIF analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ChIP, in vitro assays, co-IP, cellular phenotype), single lab","pmids":["24623817"],"is_preprint":false},{"year":2014,"finding":"RECQ1 directly interacts with FEN-1 in nuclear extracts and in vitro; recombinant RECQ1 stimulates FEN-1 endonucleolytic cleavage of 5′-flap DNA substrates including telomeric sequences; RECQ1 depletion reduces FEN-1 binding to telomeres.","method":"Co-immunoprecipitation, direct protein interaction assay, in vitro FEN-1 stimulation assay, ChIP at telomeres","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional stimulation assay plus ChIP, single lab","pmids":["25774876"],"is_preprint":false},{"year":2014,"finding":"RPA stimulates RECQ1 (as well as FANCJ) to displace protein-DNA complexes (BamHI-E111A and TRF1/TRF2 from telomeric substrates) in an ATPase-dependent manner; this RPA-stimulated protein displacement is a conserved functional interaction.","method":"In vitro protein displacement assay with purified components, ATPase-deficient mutant, RPA vs. SSB specificity comparison","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins and mutant controls, single lab","pmids":["24895130"],"is_preprint":false},{"year":2014,"finding":"RECQ1 knockdown alters expression of genes promoting cell migration/invasion (including EZR, ITGAs, SMAD3, TGFBR2); RECQ1 binds G4 motifs in promoters of downregulated genes (ChIP); rescue of mRNA expression requires wild-type RECQ1 helicase activity.","method":"Genome-wide expression profiling after RECQ1 knockdown, pathway analysis, ChIP with anti-RECQ1, helicase-dead mutant rescue","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide expression, ChIP, and mutant rescue, single lab","pmids":["25483193"],"is_preprint":false},{"year":2015,"finding":"Crystal structures of RECQ1 in complex with tailed-duplex DNA and ssDNA map ssDNA tail and branch-point interactions along helicase and Zn-binding domains; a duplex DNA-binding surface on the C-terminal domain contributes to unwinding, strand annealing, and HJ branch migration; EM shows a flat homotetrameric complex proposed to recognize HJs.","method":"X-ray crystallography of DNA complexes, EM, analytical ultracentrifugation, functional assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with DNA plus EM plus functional validation in one study","pmids":["25831490"],"is_preprint":false},{"year":2015,"finding":"Aromatic loop (AL) mutants W227A and F231A of full-length RECQ1 are defective in helicase or branch migration but retain ATPase, DNA binding, oligomerization, and strand annealing; expression of these mutants in RECQ1-depleted cells reduces replication tract length, elevates dormant origin firing, and causes DSBs suppressible by exogenous RPA, showing RECQ1 governs RPA availability for normal replication.","method":"Site-directed mutagenesis, in vitro biochemical assays (helicase, BM, ATPase, strand annealing), DNA fiber analysis, DSB quantification, RPA rescue experiment","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with multiple in vitro assays plus cellular rescue experiment linking catalytic activity to replication phenotype","pmids":["26455304"],"is_preprint":false},{"year":2016,"finding":"Zinc-binding motif cysteine residues (in RQC domain) are essential for RECQ1 ATPase and DNA unwinding activities and maintain overall protein conformation (zinc coordination, global structure); substitution of three conserved cysteines severely impairs these activities while retaining DNA binding and strand annealing.","method":"Site-directed mutagenesis of zinc-binding cysteines, ATPase assay, helicase assay, DNA binding assay, strand annealing assay, zinc content measurement, limited proteolysis","journal":"Mutation research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis with multiple in vitro functional assays, single lab","pmids":["27248010"],"is_preprint":false},{"year":2017,"finding":"RECQ1 interacts with PARP1 in multiple myeloma cells; RECQ1 depletion promotes DNA DSB formation (53BP1 foci, pATM, γH2AX); RECQ1 overexpression protects cells from melphalan and bortezomib; RECQ1 depletion sensitizes cells to PARP inhibitor.","method":"Co-immunoprecipitation, siRNA knockdown with γH2AX/53BP1/pATM readout, drug sensitivity assay, overexpression rescue","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus multiple cellular functional assays, single lab","pmids":["28186131"],"is_preprint":false},{"year":2019,"finding":"RECQ1 loss leads to defective ATR/Chk1 checkpoint activation in response to gemcitabine; dual deficiency of MUS81 and RECQ1 increases replication-associated DSBs; Chk1 inhibitor further sensitizes RECQ1-deficient cells to gemcitabine.","method":"CRISPR/Cas9 knockout, Chk1/ATR phosphorylation assay, DSB assay, drug sensitivity assay, genetic epistasis (MUS81/RECQ1 double deficiency)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with epistasis and checkpoint assays, single lab","pmids":["31444271"],"is_preprint":false},{"year":2021,"finding":"RECQ1 expression activates ESR1 (ERα) gene; >35% of RECQ1 chromatin-binding sites are co-bound by ERα; RECQ1 cooperates with pioneer factor FOXA1 to enhance chromatin accessibility at ESR1 regulatory regions in a helicase activity-dependent manner.","method":"ChIP-seq, ATAC-seq, gene expression analysis after RECQ1 knockdown, helicase-dead mutant rescue","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq plus ATAC-seq plus mutant rescue, single lab","pmids":["33468559"],"is_preprint":false},{"year":2021,"finding":"Monomeric RECQ1 is the predominant form in living cells (Bos taurus) and is more active (higher helicase and ATPase activities) than dimers or oligomers; monomeric RECQ1 efficiently unfolds intramolecular G-quadruplex DNA.","method":"Endogenous protein purification and characterization, cell fractionation, helicase/ATPase assays comparing monomer vs. oligomer, G4 unfolding assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — biochemical characterization of endogenous protein with multiple assays, single lab, challenges prior model","pmids":["34496242"],"is_preprint":false},{"year":2021,"finding":"An α-helix in the zinc-binding domain of RECQ1 interacts with residues in the WH domain; deletion or mutation of this α-helix restores strand annealing activity in annealing-deficient RECQ1 constructs and induces conformational changes affecting ATPase and unwinding activities, revealing that the zinc-binding/WH domain interface controls the switch between unwinding and annealing modes.","method":"X-ray crystallography of D2-Zn-WH fragment, site-directed mutagenesis, strand annealing assay, ATPase assay, helicase assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis with functional assays, single lab","pmids":["34751402"],"is_preprint":false},{"year":2022,"finding":"Biallelic missense mutation p.A459S in the RECQL1 zinc-binding domain causes RECON syndrome (progeroid features, xeroderma, photosensitivity); biochemically, p.A459S compromises ATPase, helicase, and fork restoration activity while strand annealing is largely unaffected; RECON patient cells are defective in repair of topoisomerase-poison-induced DNA damage and fail to support replication progression through abortive TOP1 lesions.","method":"Patient genetics, recombinant mutant protein biochemical assays (ATPase, helicase, fork restart), cellular repair assay (TOP1 poison sensitivity, replication progression)","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 / Strong — disease-causing mutation with multiple in vitro biochemical assays plus cellular mechanistic validation","pmids":["35025765"],"is_preprint":false},{"year":2025,"finding":"Crystal structures of RECQ1 in complex with G-quadruplex DNA reveal that DNA binding induces an intra-subunit closed-to-open conformational rearrangement; G4 recognition involves coordinated D1/D2 domain and ssDNA-binding channel interactions; ATP hydrolysis drives ssDNA translocation and β-hairpin-mediated unraveling of G4 tetrad hydrogen bonds analogously to dsDNA unwinding.","method":"X-ray crystallography (five structures with G4 and duplex DNA), structural comparison, ATP hydrolysis analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple high-resolution crystal structures with mechanistic interpretation, single lab","pmids":["40966504"],"is_preprint":false},{"year":2025,"finding":"An engineered RECQ1 with a flexible GS-linker between zinc-binding and WH domains shows that WH domain repositioning and ARL coordination remodel the ATPase domain; crystal structure with DNA shows a compact conformation where β-hairpin tip proximity to the aromatic-rich loop (ARL) enhances DNA binding and strand separation, coupling ATP hydrolysis to unwinding.","method":"X-ray crystallography of engineered RECQ1-DNA complex, site-directed mutagenesis, helicase/DNA-binding assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis and functional assays, single lab, engineered rather than native protein","pmids":["40512545"],"is_preprint":false},{"year":2020,"finding":"RECQL helicase is specifically essential under replication stress conditions and protects stalled replication forks against MRE11-dependent DSB formation; RECQL knockdown in cancer cells increases DSB levels under replication stress.","method":"shRNA genetic screen, RECQL knockdown, γH2AX/DSB assay, MRE11 epistasis, DNA fiber analysis","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic screen plus epistasis knockdown with DSB readout, single lab","pmids":["32820027"],"is_preprint":false},{"year":2025,"finding":"Nucleoplasmic Lamin A/C and H3K9me3 at stalled forks are required to maintain poly-ADP-ribosylation at nascent DNA; loss of Lamin A/C or H3K9me3 reduces PAR levels and deregulates RECQ1-mediated restart of reversed replication forks.","method":"Acute protein inactivation (auxin-inducible degron), single-molecule DNA fiber analysis, PAR level measurement at nascent DNA, RECQ1 fork restart assay, H3K9me3 ChIP","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple complementary approaches with direct RECQ1 restart readout, preprint not yet peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"RECQL1 (RECQ1/RECQL) is an ATP-dependent, 3′→5′ DNA helicase that exists in multiple oligomeric states—monomers/dimers catalyze DNA unwinding, while tetramers/higher-order oligomers mediate strand annealing and Holliday junction branch migration—and functions at stalled and reversed replication forks by promoting fork restart in a manner antagonized by PARP1-mediated poly(ADP-ribosyl)ation; it physically and functionally interacts with RPA (stimulating its helicase processivity), RAD51, Ku70/80 (supporting NHEJ), MSH2/6, EXO1, FEN-1, TRF2, and PARP1, and its zinc-binding domain and WH-domain β-hairpin are essential structural determinants coupling ATP hydrolysis to strand separation, while loss-of-function (knockout/knockdown or the disease-causing p.A459S mutation) causes chromosomal instability, elevated SCEs, replication stress, defective checkpoint signaling, and sensitivity to topoisomerase poisons—phenotypes collectively causing the recently described RECON genome instability syndrome."},"narrative":{"mechanistic_narrative":"RECQL encodes an ATP-dependent, 3′→5′ DNA helicase of the RecQ family that operates as a central guardian of replication fork integrity and genome stability [PMID:7961977, PMID:12419808]. Its catalytic core couples ATP hydrolysis to strand separation through a winged-helix β-hairpin (Y564 at its tip) and a zinc-binding RQC motif, both of which are required for unwinding while being dispensable for the enzyme's distinct strand-annealing mode [PMID:19151156, PMID:21059676, PMID:27248010]; an α-helix at the zinc-binding/WH-domain interface acts as a conformational switch toggling between unwinding and annealing activities [PMID:34751402]. Beyond classical duplex unwinding, RECQL catalyzes strand annealing, unidirectional 3′→5′ Holliday-junction branch migration, D-loop disruption, and G-quadruplex resolution [PMID:15899892, PMID:16260474, PMID:18495662, PMID:40966504], with its oligomeric state biasing it toward unwinding (monomers/dimers) versus annealing and junction resolution (higher-order oligomers) [PMID:17227144, PMID:34496242]. Functionally, RECQL is loaded at replication origins at S-phase onset to support origin firing and normal fork progression, protects stalled forks from MRE11-dependent breakage, and drives restart of TOP1-inhibitor-induced reversed forks—an activity restrained by PARP1 poly(ADP-ribosyl)ation in a regulatory axis further modulated by nucleoplasmic Lamin A/C and H3K9me3 [PMID:20065033, PMID:32820027, PMID:23396353]. RECQL controls cellular RPA availability for replication, and RPA reciprocally stimulates its processivity and protein-displacement activity [PMID:15096578, PMID:26455304, PMID:24895130]. It physically interacts with RPA, RAD51, the mismatch-repair factors MSH2/6 and EXO1, FEN-1, Ku70/80, TRF2, and PARP1, embedding it in homologous recombination, mismatch repair, NHEJ, telomere maintenance, and checkpoint signaling [PMID:15096578, PMID:15886194, PMID:18074021, PMID:23650516, PMID:24623817, PMID:25774876, PMID:22542292]; loss of RECQL causes aneuploidy, elevated sister-chromatid exchanges, chromosomal breakage, defective ATR/Chk1 checkpoint activation, and sensitivity to ionizing radiation and topoisomerase poisons [PMID:17158923, PMID:31444271]. RECQL also functions in transcriptional regulation, cooperating with FOXA1 to open chromatin at ESR1 regulatory regions in a helicase-dependent manner [PMID:33468559]. A biallelic p.A459S mutation in the zinc-binding domain causes RECON syndrome, a progeroid genome-instability disorder, by selectively compromising ATPase, helicase, and fork-restoration activity while sparing strand annealing [PMID:35025765].","teleology":[{"year":1994,"claim":"Established the gene product as a human RecQ-family ATP-dependent DNA helicase and placed it in the nucleus, defining the basic biochemical and spatial identity from which all later mechanistic work proceeded.","evidence":"cDNA cloning, reticulocyte lysate expression, and immunofluorescence with antipeptide antibodies in human fibroblasts","pmids":["7961977"],"confidence":"Medium","gaps":["No substrate polarity or cofactor requirements defined","Nuclear import mechanism not yet addressed"]},{"year":1997,"claim":"Identified how the helicase reaches the nucleus, showing its NLS engages specific importin-alpha homologs.","evidence":"Yeast two-hybrid, GST pulldown, and co-precipitation with Qip1 and Rch1","pmids":["9168958"],"confidence":"Medium","gaps":["Functional consequence of import for DNA transactions not tested","Single-lab interaction without in vivo nuclear-import rescue"]},{"year":2002,"claim":"Defined the core enzymatic parameters—3′→5′ polarity, 3′-ssDNA tail requirement, and specific stimulation by human RPA—establishing RECQL as an RPA-dependent helicase on physiological-length substrates.","evidence":"In vitro helicase assays with recombinant protein, polarity and substrate-length titration, RPA versus E. coli SSB comparison","pmids":["12419808"],"confidence":"High","gaps":["Physical basis of RPA stimulation not yet mapped","Cellular substrates unknown"]},{"year":2004,"claim":"Linked the RPA dependence to a direct, DNA-independent physical contact with the RPA70 subunit and showed the enzyme self-associates as dimers.","evidence":"Gel filtration, DLS, helicase assays, far-western, ELISA, and co-IP","pmids":["15096578"],"confidence":"High","gaps":["Whether higher-order forms exist in cells not addressed","Interaction interface not structurally defined"]},{"year":2005,"claim":"Revealed that RECQL is not solely a helicase but also catalyzes ATP-modulated strand annealing and acts as the predominant Holliday-junction branch migrator in human extracts, broadening its repertoire to recombination-intermediate processing.","evidence":"In vitro annealing and branch-migration assays, ATPase-deficient mutants, nuclear extract fractionation, and siRNA-coupled SCE measurement","pmids":["15899892","16260474"],"confidence":"High","gaps":["Structural determinants of the annealing/unwinding switch undefined","In vivo branch-migration substrates not identified"]},{"year":2005,"claim":"Connected RECQL to mismatch repair by demonstrating reciprocal physical and functional cooperation with MSH2/6 and EXO1.","evidence":"Co-IP from extracts, purified-protein interaction, and reciprocal stimulation assays","pmids":["15886194"],"confidence":"Medium","gaps":["Cellular MMR phenotype of RECQL loss not established","Single-lab functional stimulation"]},{"year":2006,"claim":"Provided in vivo proof that RECQL is required for genome stability, with knockout cells showing aneuploidy, breakage, translocations, and radiation hypersensitivity.","evidence":"Mouse knockout with cytogenetics, γ-H2AX, SCE, and irradiation-sensitivity assays in MEFs","pmids":["17158923"],"confidence":"High","gaps":["Molecular lesion underlying instability not pinpointed","Specific repair pathway requiring RECQL not isolated"]},{"year":2007,"claim":"Explained the dual enzymatic behavior structurally by showing quaternary state dictates activity—lower-order oligomers unwind while higher-order oligomers anneal—and that ATP shifts the equilibrium.","evidence":"Size-exclusion chromatography, EM with 3D reconstruction, and ATPase-deficient mutant competition","pmids":["17227144"],"confidence":"High","gaps":["Which oligomeric form predominates in cells not resolved","Trigger controlling oligomer interconversion in vivo unknown"]},{"year":2007,"claim":"Embedded RECQL in the DNA-damage response, demonstrating damage-induced foci, phosphorylation, RAD51 interaction, and that depletion sensitizes cells to IR and camptothecin.","evidence":"siRNA knockdown, colony survival, immunofluorescence foci, SCE, co-IP, and direct binding assays","pmids":["18074021"],"confidence":"High","gaps":["Kinase responsible for RECQL phosphorylation not identified","Functional role of RAD51 interaction not dissected"]},{"year":2008,"claim":"Distinguished RECQL from BLM functionally and mapped the N-terminus as essential for oligomerization and unique immobile-Holliday-junction resolution and D-loop disruption.","evidence":"In vitro helicase/branch-migration/D-loop assays with diverse substrates and N-terminal deletion mutagenesis","pmids":["18448429","18495662"],"confidence":"High","gaps":["In vivo relevance of D-loop disruption not shown","Why RECQL cannot regress forks like BLM not mechanistically explained"]},{"year":2010,"claim":"Defined a direct role in normal replication, showing cell-cycle-regulated origin loading and that RECQL depletion impairs origin firing and fork rates, and structurally identified the WH-domain β-hairpin (Y564) controlling oligomerization and catalysis.","evidence":"ChIP at origins, DNA fiber analysis, BrdU incorporation, plus full-length mutagenesis with SEC/AUC and functional assays","pmids":["20065033","21059676","19151156"],"confidence":"High","gaps":["Mechanism of origin recruitment not defined","Tetramer-versus-dimer choice at forks in cells unresolved"]},{"year":2012,"claim":"Established a PARP1 association and stress-specific recruitment, and showed RECQL acts at stalled forks (leading-strand unwinding, strand exchange) with depletion activating Chk1 and RPA hyperphosphorylation.","evidence":"Co-IP, direct binding, PARP activity and chromatin-recruitment assays under oxidative stress; in vitro fork strand-exchange and knockdown phenotyping","pmids":["22542292","23095637","22356911"],"confidence":"Medium","gaps":["Directionality of PARP1–RECQL regulation not yet established","Single-lab functional assays"]},{"year":2013,"claim":"Resolved the PARP1–RECQL relationship as a regulatory axis at reversed forks: RECQL restarts TOP1-induced reversed forks while PARP1 PARylation stabilizes the regressed state and limits restart; also tied RECQL to NHEJ via Ku70/80 and to fragile-site stability.","evidence":"Biochemical restart assays, EM of replication intermediates, single-molecule DNA fiber analysis with PARP inhibitors; Ku co-IP and cell-free end-joining; ChIP at FRA3B/FRA16D with aphidicolin sensitivity","pmids":["23396353","23650516","23601052"],"confidence":"High","gaps":["How PARylation physically blocks RECQL access undefined","In vivo contribution of RECQL to NHEJ versus HR not quantified"]},{"year":2014,"claim":"Extended RECQL function to telomere maintenance and broadened its biochemical partnerships—TRF2/POT1-regulated activity on telomeric substrates, FEN-1 stimulation, RPA-stimulated protein displacement—and revealed a helicase-dependent transcriptional role at G4-containing promoters.","evidence":"Telomere ChIP, in vitro D-loop/HJ resolution, co-IP, helicase-stimulation and protein-displacement assays; expression profiling with G4-promoter ChIP and helicase-dead rescue","pmids":["24623817","25774876","24895130","25483193"],"confidence":"Medium","gaps":["Direct versus indirect contribution to telomere transactions in vivo unresolved","Mechanistic link between G4 unwinding and transcription not fully defined"]},{"year":2015,"claim":"Provided structural mechanism by capturing RECQL bound to tailed-duplex and ssDNA, mapping tail and branch-point contacts and a C-terminal duplex-binding surface, and visualized a flat homotetramer proposed for HJ recognition; functionally linked catalytic mutants to RPA-availability control during replication.","evidence":"X-ray crystallography of DNA complexes, EM, AUC, plus aromatic-loop mutagenesis with DNA fiber analysis, DSB quantification, and RPA-rescue experiments","pmids":["25831490","26455304"],"confidence":"High","gaps":["Tetramer-HJ recognition not captured at atomic resolution","How RECQL globally regulates RPA pools mechanistically unclear"]},{"year":2016,"claim":"Pinpointed the zinc-binding RQC cysteines as essential for ATPase and unwinding (but not annealing or DNA binding), defining the structural element later implicated in disease.","evidence":"Mutagenesis of conserved cysteines with ATPase, helicase, binding, annealing assays, zinc-content measurement, and limited proteolysis","pmids":["27248010"],"confidence":"Medium","gaps":["Cellular consequence of zinc-motif disruption not tested at the time","Single-lab characterization"]},{"year":2017,"claim":"Connected RECQL to chemoresistance, showing PARP1 interaction in myeloma, protection against melphalan/bortezomib, and synthetic sensitization to PARP inhibition upon depletion.","evidence":"Co-IP, siRNA knockdown with DSB markers, drug-sensitivity and overexpression-rescue assays in multiple myeloma cells","pmids":["28186131"],"confidence":"Medium","gaps":["Whether PARP-inhibitor synergy generalizes beyond myeloma unknown","Single-lab study"]},{"year":2019,"claim":"Defined RECQL's role in checkpoint signaling and replication-stress survival, showing it is required for ATR/Chk1 activation after gemcitabine and acts genetically with MUS81.","evidence":"CRISPR/Cas9 knockout, ATR/Chk1 phosphorylation and DSB assays, drug sensitivity, and MUS81 epistasis","pmids":["31444271"],"confidence":"Medium","gaps":["Mechanism by which RECQL promotes ATR/Chk1 activation undefined","Single-lab epistasis"]},{"year":2020,"claim":"Established that RECQL is specifically essential under replication stress, protecting stalled forks from MRE11-dependent breakage.","evidence":"shRNA genetic screen, RECQL knockdown, γH2AX/DSB assays, MRE11 epistasis, and DNA fiber analysis in cancer cells","pmids":["32820027"],"confidence":"Medium","gaps":["How RECQL shields nascent DNA from MRE11 mechanistically unclear","Single-lab study"]},{"year":2021,"claim":"Challenged the oligomer model by showing monomeric RECQL predominates in cells and is the most active form, including efficient intramolecular G4 unfolding, and mapped a zinc-binding/WH α-helix that switches between unwinding and annealing; also defined a helicase-dependent FOXA1-cooperative chromatin-opening role at ESR1.","evidence":"Endogenous protein purification with monomer/oligomer activity comparison and G4 assays; crystallography of D2-Zn-WH fragment with mutagenesis; ChIP-seq/ATAC-seq with helicase-dead rescue","pmids":["34496242","34751402","33468559"],"confidence":"Medium","gaps":["Reconciliation of monomer-active model with prior tetramer-HJ data incomplete","Generality of transcriptional role across cell types not established"]},{"year":2022,"claim":"Demonstrated that RECQL is a Mendelian disease gene, with biallelic zinc-domain p.A459S causing RECON syndrome by selectively crippling ATPase, helicase, and fork restoration while sparing annealing, explaining the cellular topoisomerase-poison repair defect.","evidence":"Patient genetics, recombinant mutant biochemistry (ATPase, helicase, fork restart), and cellular TOP1-poison sensitivity and replication-progression assays","pmids":["35025765"],"confidence":"High","gaps":["Tissue-specific basis of progeroid phenotype unexplained","Why annealing-sparing yet pathogenic not fully reconciled"]},{"year":2025,"claim":"Delivered atomic-resolution mechanism of G4 and duplex unwinding, showing DNA-induced closed-to-open rearrangement and β-hairpin/ARL-coupled ATP-driven strand separation.","evidence":"Multiple X-ray structures with G4 and duplex DNA, ATP-hydrolysis analysis, and engineered GS-linker construct with mutagenesis and functional assays","pmids":["40966504","40512545"],"confidence":"High","gaps":["Conformational cycle observed in engineered constructs not validated for native dynamics","Coupling of these motions to cellular fork events not shown"]},{"year":null,"claim":"How chromatin context controls the PARP1–RECQL fork-restart axis and how RECQL's competing activities (unwinding, annealing, branch migration, G4 resolution) are selected in vivo at specific genomic loci remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["In vivo determinants of activity-mode selection unknown","Chromatin-level regulation (Lamin A/C, H3K9me3) of PAR-dependent restart only shown in preprint","Causal chain from molecular defect to RECON progeroid phenotype unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[2,4,8,26,27]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[2,6,11,34]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,25,27]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[2,27]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[24,30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[14,20,21]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[14,18,36]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[7,9,19,33]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[16,29]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[24,30]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[33]}],"complexes":[],"partners":["RPA1","RAD51","MSH2","EXO1","FEN1","XRCC6","TERF2","PARP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P46063","full_name":"ATP-dependent DNA helicase Q1","aliases":["DNA 3'-5' helicase Q1","DNA helicase, RecQ-like type 1","RecQ1","DNA-dependent ATPase Q1","RecQ protein-like 1"],"length_aa":649,"mass_kda":73.5,"function":"DNA helicase that plays a role in DNA damage repair and genome stability (PubMed:15886194, PubMed:35025765, PubMed:7527136, PubMed:7961977, PubMed:8056767). Exhibits a Mg(2+)- and ATP-dependent DNA-helicase activity that unwinds single- and double-stranded DNA in a 3'-5' direction (PubMed:19151156, PubMed:35025765, PubMed:7527136, PubMed:8056767). Full-length protein unwinds forked DNA substrates, resolves Holliday junctions, and has DNA strand annealing activity (PubMed:19151156, PubMed:25831490). Plays a role in restoring regressed replication forks (PubMed:35025765). Required to restart stalled replication forks induced by abortive topoisomerase 1 and 2 lesions (PubMed:35025765). Does not unwind G-quadruplex DNA (PubMed:18426915). May play a role in the repair of DNA that is damaged by ultraviolet light or other mutagens (PubMed:15886194, PubMed:7961977)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P46063/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RECQL","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"PARP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RECQL","total_profiled":1310},"omim":[{"mim_id":"620819","title":"ROTHMUND-THOMSON SYNDROME, TYPE 4; RTS4","url":"https://www.omim.org/entry/620819"},{"mim_id":"620370","title":"RECON PROGEROID SYNDROME; RECON","url":"https://www.omim.org/entry/620370"},{"mim_id":"604611","title":"RECQ PROTEIN-LIKE 2; RECQL2","url":"https://www.omim.org/entry/604611"},{"mim_id":"604610","title":"RECQ PROTEIN-LIKE 3; RECQL3","url":"https://www.omim.org/entry/604610"},{"mim_id":"603780","title":"RECQ PROTEIN-LIKE 4; RECQL4","url":"https://www.omim.org/entry/603780"}],"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/RECQL"},"hgnc":{"alias_symbol":["RecQ1","RecQL1"],"prev_symbol":[]},"alphafold":{"accession":"P46063","domains":[{"cath_id":"3.40.50.300","chopping":"72-277","consensus_level":"high","plddt":93.746,"start":72,"end":277},{"cath_id":"3.40.50.300","chopping":"285-481","consensus_level":"high","plddt":94.1638,"start":285,"end":481},{"cath_id":"1.10.10.10","chopping":"485-590","consensus_level":"high","plddt":94.8091,"start":485,"end":590},{"cath_id":"1.20.5","chopping":"7-46","consensus_level":"medium","plddt":80.6813,"start":7,"end":46}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P46063","model_url":"https://alphafold.ebi.ac.uk/files/AF-P46063-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P46063-F1-predicted_aligned_error_v6.png","plddt_mean":86.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RECQL","jax_strain_url":"https://www.jax.org/strain/search?query=RECQL"},"sequence":{"accession":"P46063","fasta_url":"https://rest.uniprot.org/uniprotkb/P46063.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P46063/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P46063"}},"corpus_meta":[{"pmid":"23396353","id":"PMC_23396353","title":"Human 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β-hairpin structure in the winged-helix domain of RECQ1 is required for DNA unwinding and oligomer formation.","date":"2010","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/21059676","citation_count":56,"is_preprint":false},{"pmid":"25831490","id":"PMC_25831490","title":"Human RECQ1 helicase-driven DNA unwinding, annealing, and branch migration: insights from DNA complex structures.","date":"2015","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/25831490","citation_count":53,"is_preprint":false},{"pmid":"21752281","id":"PMC_21752281","title":"The human RECQ1 helicase is highly expressed in glioblastoma and plays an important role in tumor cell proliferation.","date":"2011","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21752281","citation_count":48,"is_preprint":false},{"pmid":"22542292","id":"PMC_22542292","title":"RECQ1 plays a distinct role in cellular 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toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/25228686","citation_count":5,"is_preprint":false},{"pmid":"40966504","id":"PMC_40966504","title":"Structural mechanism of RECQ1 helicase in unfolding G-quadruplexes compared with duplex DNA.","date":"2025","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/40966504","citation_count":4,"is_preprint":false},{"pmid":"38439896","id":"PMC_38439896","title":"Germline RECQL gene mutations in Chinese patients with breast cancer.","date":"2024","source":"Frontiers in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38439896","citation_count":4,"is_preprint":false},{"pmid":"27565844","id":"PMC_27565844","title":"Effects of RECQ1 helicase silencing on non-small cell lung cancer cells.","date":"2016","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/27565844","citation_count":4,"is_preprint":false},{"pmid":"34751402","id":"PMC_34751402","title":"Residues at the 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encodes a 659-amino-acid ATP-dependent DNA helicase homologous to E. coli RecQ, localized predominantly to the nucleus of human fibroblasts, as confirmed by antibodies against synthetic N- and C-terminal peptides.\",\n      \"method\": \"cDNA cloning, reticulocyte lysate expression, immunofluorescence with antipeptide antibodies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cloning plus direct localization experiment with antibody validation, single lab\",\n      \"pmids\": [\"7961977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"RECQL physically interacts with importin-alpha homologs Qip1 and Rch1 (but not hSrp1) through its putative NLS, establishing a mechanism for its nuclear import.\",\n      \"method\": \"Yeast two-hybrid screening, GST pulldown, co-precipitation from cell lysates\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus GST pulldown, single lab, two complementary methods\",\n      \"pmids\": [\"9168958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RECQ1 unwinds DNA with 3′ to 5′ polarity, requires a 3′ single-stranded tail >10 nt to initiate unwinding, and its helicase activity on long substrates (>30 bp) is specifically stimulated by human RPA but not E. coli SSB.\",\n      \"method\": \"In vitro helicase assay with recombinant protein, polarity determination, substrate-length titration, SSB specificity comparison\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with defined substrates, multiple orthogonal substrate tests, replicated in subsequent studies\",\n      \"pmids\": [\"12419808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RECQL1 forms dimers in solution (~158 kDa by gel filtration/DLS), unwinds short duplexes alone, requires hRPA for longer substrates, and directly binds the 70 kDa subunit of hRPA in a DNA-independent manner.\",\n      \"method\": \"Gel filtration, dynamic light scattering, in vitro helicase assay, far-western, ELISA, co-immunoprecipitation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biochemical methods (DLS, helicase assay, co-IP, ELISA, far-western) in one study\",\n      \"pmids\": [\"15096578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RECQ1 catalyzes efficient strand annealing between complementary ssDNA molecules; ATP binding induces a conformational change that modulates this annealing activity, distinguishing it from the helicase mode.\",\n      \"method\": \"In vitro strand annealing assay, ATPase-deficient mutant analysis, DNA-binding assays with diverse substrates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutants and diverse substrates, single lab but multiple orthogonal assays\",\n      \"pmids\": [\"15899892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RECQ1 physically interacts with mismatch repair proteins MSH2/6 and exonuclease 1 in vivo (co-IP) and in vitro (purified proteins); MSH2/6 stimulates RECQ1 helicase activity and RECQ1 stimulates EXO1 incision activity.\",\n      \"method\": \"Co-immunoprecipitation from cell extracts, purified protein interaction assays, functional stimulation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal in vivo co-IP plus purified-protein functional assays, single lab\",\n      \"pmids\": [\"15886194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RecQL1 is the predominant ATP-dependent Holliday junction branch migrator in human nuclear extracts; RNAi-mediated depletion of RecQL1 in HeLa cells increases sister chromatid exchange frequency.\",\n      \"method\": \"Nuclear extract fractionation, in vitro branch migration assay, siRNA knockdown with SCE measurement\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical fractionation showing predominance plus cellular knockdown phenotype, replicated by independent group\",\n      \"pmids\": [\"16260474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RECQL-deficient mouse embryonic fibroblasts display aneuploidy, spontaneous chromosomal breakage, frequent translocations, hypersensitivity to ionizing radiation, elevated DNA damage load, and increased spontaneous SCEs, demonstrating a unique role in genomic stability.\",\n      \"method\": \"Mouse knockout, cytogenetic analysis, γ-H2AX assay, SCE assay, irradiation sensitivity assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple independent cellular phenotype readouts, replicated directionally by other labs\",\n      \"pmids\": [\"17158923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Different quaternary structures of RECQ1 are associated with distinct enzymatic activities: higher-order oligomers (pentamers/hexamers) favor strand annealing, while lower-order oligomers (monomers/dimers) are required for DNA unwinding; ATP/ATPγS shifts equilibrium toward lower-order forms.\",\n      \"method\": \"Size exclusion chromatography, transmission electron microscopy, 3D EM reconstruction, ATPase-deficient mutant competition assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple structural and biochemical approaches including EM reconstruction and mutant competition assays in one study\",\n      \"pmids\": [\"17227144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human RECQ1 depletion renders cells sensitive to ionizing radiation and camptothecin, causes spontaneous γ-H2AX foci and elevated SCEs, and RECQ1 forms irradiation-induced nuclear foci, becomes phosphorylated upon DNA damage, and directly interacts with RAD51.\",\n      \"method\": \"siRNA knockdown, colony survival assay, immunofluorescence (γ-H2AX, RECQ1 foci), SCE assay, co-immunoprecipitation, direct protein interaction assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (knockdown, foci, co-IP, direct binding) in one study, corroborated by subsequent work\",\n      \"pmids\": [\"18074021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RECQ1 has distinct substrate specificity from BLM: it cannot unwind G-quadruplexes or RNA-DNA hybrids, cannot substitute for BLM in model replication fork regression, but uniquely resolves immobile Holliday junctions lacking a homologous core; the N-terminal region (residues 1–56) is essential for oligomerization and HJ disruption activity.\",\n      \"method\": \"In vitro helicase assay with diverse substrates, N-terminal deletion mutagenesis, substrate competition assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with multiple substrates and domain-deletion mutagenesis in one study\",\n      \"pmids\": [\"18448429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RECQ1 efficiently catalyzes unidirectional 3′→5′ DNA branch migration and disrupts D-loops formed by 5′-invading strands, representing a dead-end intermediate of homologous recombination.\",\n      \"method\": \"In vitro branch migration assay with synthetic substrates, D-loop disruption assay, polarity determination\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with defined substrates and polarity analysis, corroborated by independent subsequent study\",\n      \"pmids\": [\"18495662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of truncated human RECQ1 with Mg-ADP reveals conservation of all structural domains (RecA-like, zinc-binding, winged-helix) with distinct WH domain orientation versus E. coli RecQ; a prominent β-hairpin in the WH domain is identified as essential for DNA strand separation.\",\n      \"method\": \"X-ray crystallography, β-hairpin mutant functional analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mutagenesis validation\",\n      \"pmids\": [\"19151156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The β-hairpin (with Y564 at tip) in the WH domain of RECQ1 is required for DNA unwinding, HJ resolution activity, dimer formation of truncated RECQ1, and tetramer formation of full-length RECQ1; tetramers are necessary for HJ resolution and strand annealing, while dimers favor DNA unwinding.\",\n      \"method\": \"Site-directed mutagenesis of full-length RECQ1, in vitro helicase/HJ/annealing assays, SEC/analytical ultracentrifugation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis coupled with functional assays and biophysical oligomeric state determination\",\n      \"pmids\": [\"21059676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RECQ1 (and RECQ4) associate with replication origins in a cell cycle-regulated manner in unperturbed cells; RECQ1 is loaded at origins at onset of S phase, and its depletion reduces nascent origin DNA synthesis, origin firing frequency, and replication fork rates.\",\n      \"method\": \"ChIP at characterized replication origins, DNA fiber analysis, siRNA depletion, BrdU incorporation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP with multiple origins, DNA fiber analysis, and knockdown with quantitative replication readouts\",\n      \"pmids\": [\"20065033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RECQ1 associates with PARP-1 in nuclear extracts and directly interacts with PARP-1 in vitro; RECQ1-deficient cells specifically hyperactivate PARP in response to H₂O₂ (but not in undamaged cells), and RECQ1 rapidly and reversibly recruits to chromatin upon oxidative stress before WRN.\",\n      \"method\": \"Co-immunoprecipitation, direct protein interaction assay, PARP activity measurement, chromatin fractionation/localization\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional cellular assays, single lab\",\n      \"pmids\": [\"22542292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RECQ1 promotes strand exchange on synthetic stalled replication fork structures; it unwinds the leading strand of the fork (similar to WRN); stable RECQ1 depletion activates Chk1, hyper-phosphorylates RPA32, and causes chromosome condensation defects.\",\n      \"method\": \"In vitro strand exchange assay with fork substrates, siRNA knockdown, phospho-Chk1/RPA Western blot, chromosomal condensation analysis\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro reconstitution plus cellular depletion phenotypes, single lab\",\n      \"pmids\": [\"23095637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RAD54, BLM, and RECQ1 promote branch migration preferentially in the 3′→5′ direction relative to the displaced ssDNA strand; helicase activity of BM proteins does not play a role in heterology bypass during branch migration.\",\n      \"method\": \"In vitro branch migration assay with RAD51/RecA-made joint molecules, polarity determination, heterology bypass assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined substrates, single lab\",\n      \"pmids\": [\"22356911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RECQ1 is required for restart of TOP1-inhibitor-induced reversed replication forks; PARP1 poly(ADP-ribosyl)ation stabilizes forks in the regressed state and limits their restart by RECQ1, establishing a PARP1–RECQ1 regulatory axis at stalled forks.\",\n      \"method\": \"Biochemical fork restart assay, electron microscopy of replication intermediates, single-molecule DNA fiber analysis, PARP inhibitor treatment\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (EM, fiber analysis, biochemical assays) in one study with mechanistic dissection\",\n      \"pmids\": [\"23396353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RECQ1 directly interacts with Ku70/80 (subunit of DNA-PK); RECQ1 depletion reduces DNA end-joining in cell-free extracts; RECQ1 unwinds Ku70/80-bound partial duplex DNA and modulates Ku70/80 DNA binding, implicating RECQ1 in NHEJ.\",\n      \"method\": \"Co-immunoprecipitation, purified protein binding assay, cell-free end-joining assay, in vitro helicase assay with Ku-bound substrates\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus purified-protein functional assays plus cell-free NHEJ assay, single lab\",\n      \"pmids\": [\"23650516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RECQ1 is specifically enriched at common fragile sites FRA3B and FRA16D under replication stress (aphidicolin treatment); RECQ1 depletion attenuates checkpoint activation, increases aphidicolin sensitivity, and causes chromosomal instability, implicating RECQ1 in repair at stalled forks at fragile sites.\",\n      \"method\": \"ChIP-qPCR at defined replication origins and fragile sites, siRNA knockdown, aphidicolin sensitivity assay, chromosomal instability analysis\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus multiple cellular phenotype assays, single lab\",\n      \"pmids\": [\"23601052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RECQL1 associates with telomeres in ALT cells, resolves telomeric D-loops and HJ substrates in vitro, physically and functionally interacts with TRF2 (which regulates its helicase activity on telomeric substrates), and is stimulated by POT1 on telomeric substrates with thymine glycol lesions; RECQL1 loss causes telomere dysfunction, shortening, and elevated T-SCEs.\",\n      \"method\": \"ChIP at telomeres, in vitro D-loop/HJ resolution assays, co-immunoprecipitation, helicase stimulation assay, telomere FISH/TIF analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ChIP, in vitro assays, co-IP, cellular phenotype), single lab\",\n      \"pmids\": [\"24623817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RECQ1 directly interacts with FEN-1 in nuclear extracts and in vitro; recombinant RECQ1 stimulates FEN-1 endonucleolytic cleavage of 5′-flap DNA substrates including telomeric sequences; RECQ1 depletion reduces FEN-1 binding to telomeres.\",\n      \"method\": \"Co-immunoprecipitation, direct protein interaction assay, in vitro FEN-1 stimulation assay, ChIP at telomeres\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional stimulation assay plus ChIP, single lab\",\n      \"pmids\": [\"25774876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RPA stimulates RECQ1 (as well as FANCJ) to displace protein-DNA complexes (BamHI-E111A and TRF1/TRF2 from telomeric substrates) in an ATPase-dependent manner; this RPA-stimulated protein displacement is a conserved functional interaction.\",\n      \"method\": \"In vitro protein displacement assay with purified components, ATPase-deficient mutant, RPA vs. SSB specificity comparison\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins and mutant controls, single lab\",\n      \"pmids\": [\"24895130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RECQ1 knockdown alters expression of genes promoting cell migration/invasion (including EZR, ITGAs, SMAD3, TGFBR2); RECQ1 binds G4 motifs in promoters of downregulated genes (ChIP); rescue of mRNA expression requires wild-type RECQ1 helicase activity.\",\n      \"method\": \"Genome-wide expression profiling after RECQ1 knockdown, pathway analysis, ChIP with anti-RECQ1, helicase-dead mutant rescue\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide expression, ChIP, and mutant rescue, single lab\",\n      \"pmids\": [\"25483193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structures of RECQ1 in complex with tailed-duplex DNA and ssDNA map ssDNA tail and branch-point interactions along helicase and Zn-binding domains; a duplex DNA-binding surface on the C-terminal domain contributes to unwinding, strand annealing, and HJ branch migration; EM shows a flat homotetrameric complex proposed to recognize HJs.\",\n      \"method\": \"X-ray crystallography of DNA complexes, EM, analytical ultracentrifugation, functional assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with DNA plus EM plus functional validation in one study\",\n      \"pmids\": [\"25831490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Aromatic loop (AL) mutants W227A and F231A of full-length RECQ1 are defective in helicase or branch migration but retain ATPase, DNA binding, oligomerization, and strand annealing; expression of these mutants in RECQ1-depleted cells reduces replication tract length, elevates dormant origin firing, and causes DSBs suppressible by exogenous RPA, showing RECQ1 governs RPA availability for normal replication.\",\n      \"method\": \"Site-directed mutagenesis, in vitro biochemical assays (helicase, BM, ATPase, strand annealing), DNA fiber analysis, DSB quantification, RPA rescue experiment\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with multiple in vitro assays plus cellular rescue experiment linking catalytic activity to replication phenotype\",\n      \"pmids\": [\"26455304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Zinc-binding motif cysteine residues (in RQC domain) are essential for RECQ1 ATPase and DNA unwinding activities and maintain overall protein conformation (zinc coordination, global structure); substitution of three conserved cysteines severely impairs these activities while retaining DNA binding and strand annealing.\",\n      \"method\": \"Site-directed mutagenesis of zinc-binding cysteines, ATPase assay, helicase assay, DNA binding assay, strand annealing assay, zinc content measurement, limited proteolysis\",\n      \"journal\": \"Mutation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with multiple in vitro functional assays, single lab\",\n      \"pmids\": [\"27248010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RECQ1 interacts with PARP1 in multiple myeloma cells; RECQ1 depletion promotes DNA DSB formation (53BP1 foci, pATM, γH2AX); RECQ1 overexpression protects cells from melphalan and bortezomib; RECQ1 depletion sensitizes cells to PARP inhibitor.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown with γH2AX/53BP1/pATM readout, drug sensitivity assay, overexpression rescue\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus multiple cellular functional assays, single lab\",\n      \"pmids\": [\"28186131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RECQ1 loss leads to defective ATR/Chk1 checkpoint activation in response to gemcitabine; dual deficiency of MUS81 and RECQ1 increases replication-associated DSBs; Chk1 inhibitor further sensitizes RECQ1-deficient cells to gemcitabine.\",\n      \"method\": \"CRISPR/Cas9 knockout, Chk1/ATR phosphorylation assay, DSB assay, drug sensitivity assay, genetic epistasis (MUS81/RECQ1 double deficiency)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with epistasis and checkpoint assays, single lab\",\n      \"pmids\": [\"31444271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RECQ1 expression activates ESR1 (ERα) gene; >35% of RECQ1 chromatin-binding sites are co-bound by ERα; RECQ1 cooperates with pioneer factor FOXA1 to enhance chromatin accessibility at ESR1 regulatory regions in a helicase activity-dependent manner.\",\n      \"method\": \"ChIP-seq, ATAC-seq, gene expression analysis after RECQ1 knockdown, helicase-dead mutant rescue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq plus ATAC-seq plus mutant rescue, single lab\",\n      \"pmids\": [\"33468559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Monomeric RECQ1 is the predominant form in living cells (Bos taurus) and is more active (higher helicase and ATPase activities) than dimers or oligomers; monomeric RECQ1 efficiently unfolds intramolecular G-quadruplex DNA.\",\n      \"method\": \"Endogenous protein purification and characterization, cell fractionation, helicase/ATPase assays comparing monomer vs. oligomer, G4 unfolding assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical characterization of endogenous protein with multiple assays, single lab, challenges prior model\",\n      \"pmids\": [\"34496242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"An α-helix in the zinc-binding domain of RECQ1 interacts with residues in the WH domain; deletion or mutation of this α-helix restores strand annealing activity in annealing-deficient RECQ1 constructs and induces conformational changes affecting ATPase and unwinding activities, revealing that the zinc-binding/WH domain interface controls the switch between unwinding and annealing modes.\",\n      \"method\": \"X-ray crystallography of D2-Zn-WH fragment, site-directed mutagenesis, strand annealing assay, ATPase assay, helicase assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis with functional assays, single lab\",\n      \"pmids\": [\"34751402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Biallelic missense mutation p.A459S in the RECQL1 zinc-binding domain causes RECON syndrome (progeroid features, xeroderma, photosensitivity); biochemically, p.A459S compromises ATPase, helicase, and fork restoration activity while strand annealing is largely unaffected; RECON patient cells are defective in repair of topoisomerase-poison-induced DNA damage and fail to support replication progression through abortive TOP1 lesions.\",\n      \"method\": \"Patient genetics, recombinant mutant protein biochemical assays (ATPase, helicase, fork restart), cellular repair assay (TOP1 poison sensitivity, replication progression)\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — disease-causing mutation with multiple in vitro biochemical assays plus cellular mechanistic validation\",\n      \"pmids\": [\"35025765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Crystal structures of RECQ1 in complex with G-quadruplex DNA reveal that DNA binding induces an intra-subunit closed-to-open conformational rearrangement; G4 recognition involves coordinated D1/D2 domain and ssDNA-binding channel interactions; ATP hydrolysis drives ssDNA translocation and β-hairpin-mediated unraveling of G4 tetrad hydrogen bonds analogously to dsDNA unwinding.\",\n      \"method\": \"X-ray crystallography (five structures with G4 and duplex DNA), structural comparison, ATP hydrolysis analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple high-resolution crystal structures with mechanistic interpretation, single lab\",\n      \"pmids\": [\"40966504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"An engineered RECQ1 with a flexible GS-linker between zinc-binding and WH domains shows that WH domain repositioning and ARL coordination remodel the ATPase domain; crystal structure with DNA shows a compact conformation where β-hairpin tip proximity to the aromatic-rich loop (ARL) enhances DNA binding and strand separation, coupling ATP hydrolysis to unwinding.\",\n      \"method\": \"X-ray crystallography of engineered RECQ1-DNA complex, site-directed mutagenesis, helicase/DNA-binding assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis and functional assays, single lab, engineered rather than native protein\",\n      \"pmids\": [\"40512545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RECQL helicase is specifically essential under replication stress conditions and protects stalled replication forks against MRE11-dependent DSB formation; RECQL knockdown in cancer cells increases DSB levels under replication stress.\",\n      \"method\": \"shRNA genetic screen, RECQL knockdown, γH2AX/DSB assay, MRE11 epistasis, DNA fiber analysis\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic screen plus epistasis knockdown with DSB readout, single lab\",\n      \"pmids\": [\"32820027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Nucleoplasmic Lamin A/C and H3K9me3 at stalled forks are required to maintain poly-ADP-ribosylation at nascent DNA; loss of Lamin A/C or H3K9me3 reduces PAR levels and deregulates RECQ1-mediated restart of reversed replication forks.\",\n      \"method\": \"Acute protein inactivation (auxin-inducible degron), single-molecule DNA fiber analysis, PAR level measurement at nascent DNA, RECQ1 fork restart assay, H3K9me3 ChIP\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary approaches with direct RECQ1 restart readout, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RECQL1 (RECQ1/RECQL) is an ATP-dependent, 3′→5′ DNA helicase that exists in multiple oligomeric states—monomers/dimers catalyze DNA unwinding, while tetramers/higher-order oligomers mediate strand annealing and Holliday junction branch migration—and functions at stalled and reversed replication forks by promoting fork restart in a manner antagonized by PARP1-mediated poly(ADP-ribosyl)ation; it physically and functionally interacts with RPA (stimulating its helicase processivity), RAD51, Ku70/80 (supporting NHEJ), MSH2/6, EXO1, FEN-1, TRF2, and PARP1, and its zinc-binding domain and WH-domain β-hairpin are essential structural determinants coupling ATP hydrolysis to strand separation, while loss-of-function (knockout/knockdown or the disease-causing p.A459S mutation) causes chromosomal instability, elevated SCEs, replication stress, defective checkpoint signaling, and sensitivity to topoisomerase poisons—phenotypes collectively causing the recently described RECON genome instability syndrome.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RECQL encodes an ATP-dependent, 3′→5′ DNA helicase of the RecQ family that operates as a central guardian of replication fork integrity and genome stability [#0, #2]. Its catalytic core couples ATP hydrolysis to strand separation through a winged-helix β-hairpin (Y564 at its tip) and a zinc-binding RQC motif, both of which are required for unwinding while being dispensable for the enzyme's distinct strand-annealing mode [#12, #13, #27]; an α-helix at the zinc-binding/WH-domain interface acts as a conformational switch toggling between unwinding and annealing activities [#32]. Beyond classical duplex unwinding, RECQL catalyzes strand annealing, unidirectional 3′→5′ Holliday-junction branch migration, D-loop disruption, and G-quadruplex resolution [#4, #6, #11, #34], with its oligomeric state biasing it toward unwinding (monomers/dimers) versus annealing and junction resolution (higher-order oligomers) [#8, #31]. Functionally, RECQL is loaded at replication origins at S-phase onset to support origin firing and normal fork progression, protects stalled forks from MRE11-dependent breakage, and drives restart of TOP1-inhibitor-induced reversed forks—an activity restrained by PARP1 poly(ADP-ribosyl)ation in a regulatory axis further modulated by nucleoplasmic Lamin A/C and H3K9me3 [#14, #36, #18]. RECQL controls cellular RPA availability for replication, and RPA reciprocally stimulates its processivity and protein-displacement activity [#3, #26, #23]. It physically interacts with RPA, RAD51, the mismatch-repair factors MSH2/6 and EXO1, FEN-1, Ku70/80, TRF2, and PARP1, embedding it in homologous recombination, mismatch repair, NHEJ, telomere maintenance, and checkpoint signaling [#3, #5, #9, #19, #21, #22, #15]; loss of RECQL causes aneuploidy, elevated sister-chromatid exchanges, chromosomal breakage, defective ATR/Chk1 checkpoint activation, and sensitivity to ionizing radiation and topoisomerase poisons [#7, #29]. RECQL also functions in transcriptional regulation, cooperating with FOXA1 to open chromatin at ESR1 regulatory regions in a helicase-dependent manner [#30]. A biallelic p.A459S mutation in the zinc-binding domain causes RECON syndrome, a progeroid genome-instability disorder, by selectively compromising ATPase, helicase, and fork-restoration activity while sparing strand annealing [#33].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the gene product as a human RecQ-family ATP-dependent DNA helicase and placed it in the nucleus, defining the basic biochemical and spatial identity from which all later mechanistic work proceeded.\",\n      \"evidence\": \"cDNA cloning, reticulocyte lysate expression, and immunofluorescence with antipeptide antibodies in human fibroblasts\",\n      \"pmids\": [\"7961977\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No substrate polarity or cofactor requirements defined\", \"Nuclear import mechanism not yet addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identified how the helicase reaches the nucleus, showing its NLS engages specific importin-alpha homologs.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, and co-precipitation with Qip1 and Rch1\",\n      \"pmids\": [\"9168958\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of import for DNA transactions not tested\", \"Single-lab interaction without in vivo nuclear-import rescue\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the core enzymatic parameters—3′→5′ polarity, 3′-ssDNA tail requirement, and specific stimulation by human RPA—establishing RECQL as an RPA-dependent helicase on physiological-length substrates.\",\n      \"evidence\": \"In vitro helicase assays with recombinant protein, polarity and substrate-length titration, RPA versus E. coli SSB comparison\",\n      \"pmids\": [\"12419808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical basis of RPA stimulation not yet mapped\", \"Cellular substrates unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked the RPA dependence to a direct, DNA-independent physical contact with the RPA70 subunit and showed the enzyme self-associates as dimers.\",\n      \"evidence\": \"Gel filtration, DLS, helicase assays, far-western, ELISA, and co-IP\",\n      \"pmids\": [\"15096578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether higher-order forms exist in cells not addressed\", \"Interaction interface not structurally defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed that RECQL is not solely a helicase but also catalyzes ATP-modulated strand annealing and acts as the predominant Holliday-junction branch migrator in human extracts, broadening its repertoire to recombination-intermediate processing.\",\n      \"evidence\": \"In vitro annealing and branch-migration assays, ATPase-deficient mutants, nuclear extract fractionation, and siRNA-coupled SCE measurement\",\n      \"pmids\": [\"15899892\", \"16260474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural determinants of the annealing/unwinding switch undefined\", \"In vivo branch-migration substrates not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected RECQL to mismatch repair by demonstrating reciprocal physical and functional cooperation with MSH2/6 and EXO1.\",\n      \"evidence\": \"Co-IP from extracts, purified-protein interaction, and reciprocal stimulation assays\",\n      \"pmids\": [\"15886194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular MMR phenotype of RECQL loss not established\", \"Single-lab functional stimulation\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided in vivo proof that RECQL is required for genome stability, with knockout cells showing aneuploidy, breakage, translocations, and radiation hypersensitivity.\",\n      \"evidence\": \"Mouse knockout with cytogenetics, γ-H2AX, SCE, and irradiation-sensitivity assays in MEFs\",\n      \"pmids\": [\"17158923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular lesion underlying instability not pinpointed\", \"Specific repair pathway requiring RECQL not isolated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Explained the dual enzymatic behavior structurally by showing quaternary state dictates activity—lower-order oligomers unwind while higher-order oligomers anneal—and that ATP shifts the equilibrium.\",\n      \"evidence\": \"Size-exclusion chromatography, EM with 3D reconstruction, and ATPase-deficient mutant competition\",\n      \"pmids\": [\"17227144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which oligomeric form predominates in cells not resolved\", \"Trigger controlling oligomer interconversion in vivo unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Embedded RECQL in the DNA-damage response, demonstrating damage-induced foci, phosphorylation, RAD51 interaction, and that depletion sensitizes cells to IR and camptothecin.\",\n      \"evidence\": \"siRNA knockdown, colony survival, immunofluorescence foci, SCE, co-IP, and direct binding assays\",\n      \"pmids\": [\"18074021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for RECQL phosphorylation not identified\", \"Functional role of RAD51 interaction not dissected\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Distinguished RECQL from BLM functionally and mapped the N-terminus as essential for oligomerization and unique immobile-Holliday-junction resolution and D-loop disruption.\",\n      \"evidence\": \"In vitro helicase/branch-migration/D-loop assays with diverse substrates and N-terminal deletion mutagenesis\",\n      \"pmids\": [\"18448429\", \"18495662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of D-loop disruption not shown\", \"Why RECQL cannot regress forks like BLM not mechanistically explained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a direct role in normal replication, showing cell-cycle-regulated origin loading and that RECQL depletion impairs origin firing and fork rates, and structurally identified the WH-domain β-hairpin (Y564) controlling oligomerization and catalysis.\",\n      \"evidence\": \"ChIP at origins, DNA fiber analysis, BrdU incorporation, plus full-length mutagenesis with SEC/AUC and functional assays\",\n      \"pmids\": [\"20065033\", \"21059676\", \"19151156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of origin recruitment not defined\", \"Tetramer-versus-dimer choice at forks in cells unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established a PARP1 association and stress-specific recruitment, and showed RECQL acts at stalled forks (leading-strand unwinding, strand exchange) with depletion activating Chk1 and RPA hyperphosphorylation.\",\n      \"evidence\": \"Co-IP, direct binding, PARP activity and chromatin-recruitment assays under oxidative stress; in vitro fork strand-exchange and knockdown phenotyping\",\n      \"pmids\": [\"22542292\", \"23095637\", \"22356911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Directionality of PARP1–RECQL regulation not yet established\", \"Single-lab functional assays\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved the PARP1–RECQL relationship as a regulatory axis at reversed forks: RECQL restarts TOP1-induced reversed forks while PARP1 PARylation stabilizes the regressed state and limits restart; also tied RECQL to NHEJ via Ku70/80 and to fragile-site stability.\",\n      \"evidence\": \"Biochemical restart assays, EM of replication intermediates, single-molecule DNA fiber analysis with PARP inhibitors; Ku co-IP and cell-free end-joining; ChIP at FRA3B/FRA16D with aphidicolin sensitivity\",\n      \"pmids\": [\"23396353\", \"23650516\", \"23601052\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PARylation physically blocks RECQL access undefined\", \"In vivo contribution of RECQL to NHEJ versus HR not quantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended RECQL function to telomere maintenance and broadened its biochemical partnerships—TRF2/POT1-regulated activity on telomeric substrates, FEN-1 stimulation, RPA-stimulated protein displacement—and revealed a helicase-dependent transcriptional role at G4-containing promoters.\",\n      \"evidence\": \"Telomere ChIP, in vitro D-loop/HJ resolution, co-IP, helicase-stimulation and protein-displacement assays; expression profiling with G4-promoter ChIP and helicase-dead rescue\",\n      \"pmids\": [\"24623817\", \"25774876\", \"24895130\", \"25483193\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect contribution to telomere transactions in vivo unresolved\", \"Mechanistic link between G4 unwinding and transcription not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided structural mechanism by capturing RECQL bound to tailed-duplex and ssDNA, mapping tail and branch-point contacts and a C-terminal duplex-binding surface, and visualized a flat homotetramer proposed for HJ recognition; functionally linked catalytic mutants to RPA-availability control during replication.\",\n      \"evidence\": \"X-ray crystallography of DNA complexes, EM, AUC, plus aromatic-loop mutagenesis with DNA fiber analysis, DSB quantification, and RPA-rescue experiments\",\n      \"pmids\": [\"25831490\", \"26455304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tetramer-HJ recognition not captured at atomic resolution\", \"How RECQL globally regulates RPA pools mechanistically unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Pinpointed the zinc-binding RQC cysteines as essential for ATPase and unwinding (but not annealing or DNA binding), defining the structural element later implicated in disease.\",\n      \"evidence\": \"Mutagenesis of conserved cysteines with ATPase, helicase, binding, annealing assays, zinc-content measurement, and limited proteolysis\",\n      \"pmids\": [\"27248010\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular consequence of zinc-motif disruption not tested at the time\", \"Single-lab characterization\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected RECQL to chemoresistance, showing PARP1 interaction in myeloma, protection against melphalan/bortezomib, and synthetic sensitization to PARP inhibition upon depletion.\",\n      \"evidence\": \"Co-IP, siRNA knockdown with DSB markers, drug-sensitivity and overexpression-rescue assays in multiple myeloma cells\",\n      \"pmids\": [\"28186131\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PARP-inhibitor synergy generalizes beyond myeloma unknown\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined RECQL's role in checkpoint signaling and replication-stress survival, showing it is required for ATR/Chk1 activation after gemcitabine and acts genetically with MUS81.\",\n      \"evidence\": \"CRISPR/Cas9 knockout, ATR/Chk1 phosphorylation and DSB assays, drug sensitivity, and MUS81 epistasis\",\n      \"pmids\": [\"31444271\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which RECQL promotes ATR/Chk1 activation undefined\", \"Single-lab epistasis\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established that RECQL is specifically essential under replication stress, protecting stalled forks from MRE11-dependent breakage.\",\n      \"evidence\": \"shRNA genetic screen, RECQL knockdown, γH2AX/DSB assays, MRE11 epistasis, and DNA fiber analysis in cancer cells\",\n      \"pmids\": [\"32820027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How RECQL shields nascent DNA from MRE11 mechanistically unclear\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Challenged the oligomer model by showing monomeric RECQL predominates in cells and is the most active form, including efficient intramolecular G4 unfolding, and mapped a zinc-binding/WH α-helix that switches between unwinding and annealing; also defined a helicase-dependent FOXA1-cooperative chromatin-opening role at ESR1.\",\n      \"evidence\": \"Endogenous protein purification with monomer/oligomer activity comparison and G4 assays; crystallography of D2-Zn-WH fragment with mutagenesis; ChIP-seq/ATAC-seq with helicase-dead rescue\",\n      \"pmids\": [\"34496242\", \"34751402\", \"33468559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of monomer-active model with prior tetramer-HJ data incomplete\", \"Generality of transcriptional role across cell types not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated that RECQL is a Mendelian disease gene, with biallelic zinc-domain p.A459S causing RECON syndrome by selectively crippling ATPase, helicase, and fork restoration while sparing annealing, explaining the cellular topoisomerase-poison repair defect.\",\n      \"evidence\": \"Patient genetics, recombinant mutant biochemistry (ATPase, helicase, fork restart), and cellular TOP1-poison sensitivity and replication-progression assays\",\n      \"pmids\": [\"35025765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific basis of progeroid phenotype unexplained\", \"Why annealing-sparing yet pathogenic not fully reconciled\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Delivered atomic-resolution mechanism of G4 and duplex unwinding, showing DNA-induced closed-to-open rearrangement and β-hairpin/ARL-coupled ATP-driven strand separation.\",\n      \"evidence\": \"Multiple X-ray structures with G4 and duplex DNA, ATP-hydrolysis analysis, and engineered GS-linker construct with mutagenesis and functional assays\",\n      \"pmids\": [\"40966504\", \"40512545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational cycle observed in engineered constructs not validated for native dynamics\", \"Coupling of these motions to cellular fork events not shown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How chromatin context controls the PARP1–RECQL fork-restart axis and how RECQL's competing activities (unwinding, annealing, branch migration, G4 resolution) are selected in vivo at specific genomic loci remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo determinants of activity-mode selection unknown\", \"Chromatin-level regulation (Lamin A/C, H3K9me3) of PAR-dependent restart only shown in preprint\", \"Causal chain from molecular defect to RECON progeroid phenotype unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [2, 4, 8, 26, 27]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [2, 6, 11, 34]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 25, 27]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 27]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [24, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [14, 20, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [14, 18, 36]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [7, 9, 19, 33]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [16, 29]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [24, 30]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [33]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RPA1\", \"RAD51\", \"MSH2\", \"EXO1\", \"FEN1\", \"XRCC6\", \"TERF2\", \"PARP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}