{"gene":"RECQL4","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1999,"finding":"RECQL4 protein localizes to the nucleus (nucleoplasm) in HeLa cells, as determined by immunocytochemical analysis.","method":"Immunocytochemistry in HeLa cells","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single localization experiment, single lab, no functional consequence mapped","pmids":["10552928"],"is_preprint":false},{"year":2005,"finding":"The Xenopus RECQL4 homolog (xRTS) is essential for DNA replication initiation in egg extracts; it loads onto chromatin after pre-RC proteins but before replicative polymerases, and its depletion prevents RPA loading at origins, placing it between pre-RC assembly and origin unwinding.","method":"Xenopus egg extract depletion/add-back, chromatin fractionation, immunodepletion epistasis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal depletion/reconstitution in cell-free system with multiple orthogonal epistasis experiments, replicated in mammalian cells","pmids":["15960976"],"is_preprint":false},{"year":2006,"finding":"The N-terminal non-helicase domain of Xenopus RecQ4 is necessary and sufficient for DNA replication initiation in egg extracts; it physically interacts with Cut5 (TopBP1/Dpb11 ortholog) and is required for chromatin loading of DNA polymerase alpha.","method":"Xenopus egg extract depletion/rescue with N-terminal fragments, co-immunoprecipitation with Cut5, antibody inhibition assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution in cell-free extract with domain mapping and physical interaction, multiple methods","pmids":["16782873"],"is_preprint":false},{"year":2005,"finding":"Purified human RECQ4 has DNA-stimulated ATPase activity (preferentially activated by ssDNA requiring ≥60 nt for maximal stimulation; minimal binding site 20–40 nt), and strand-annealing activity inhibited by RPA; no DNA helicase activity was detected.","method":"In vitro ATPase assay, strand-annealing assay, helicase assay with purified recombinant RECQ4","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro biochemical reconstitution with purified protein, multiple substrate assays; helicase-negative finding later revised by other labs","pmids":["16214424"],"is_preprint":false},{"year":2009,"finding":"RECQL4 exhibits two distinct ATP-dependent DNA unwinding activities: one from the conserved helicase motifs and one from the Sld2-like N-terminal domain, each capable of independently promoting strand separation.","method":"In vitro helicase assay with purified recombinant RECQL4 and domain deletion mutants","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro reconstitution with domain mutants, single lab with multiple substrates","pmids":["19177149"],"is_preprint":false},{"year":2009,"finding":"RECQL4 co-purifies in a chromatin-bound complex with MCM2-7, CDC45, GINS, and MCM10 from human cells; MCM10 directly interacts with RECQL4, regulates its DNA unwinding activity, and is essential for RECQL4-MCM complex integrity; complex formation and origin association are cell-cycle regulated.","method":"Biochemical purification from human cell extracts, co-IP, chromatin immunoprecipitation (ChIP), cell-cycle fractionation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, biochemical purification, ChIP, functional helicase assay with MCM10, multiple orthogonal methods","pmids":["19696745"],"is_preprint":false},{"year":2009,"finding":"Assembly of the CMG (Cdc45-MCM2-7-GINS) complex in human cells requires RecQL4 (as well as Ctf4/And-1 and Mcm10); stable CMG association was detected only after G1/S transition and required CDK and Cdc7 kinase activities.","method":"Bimolecular fluorescence complementation (BiFC) in HeLa cells, siRNA depletion, CDK/DDK inhibitor treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-based BiFC plus pharmacological inhibition and siRNA, multiple conditions tested","pmids":["19805216"],"is_preprint":false},{"year":2009,"finding":"Purified RECQL4 expressed in insect cells exhibits 3'-5' DNA helicase activity (displaces annealed oligonucleotides in an ATP/Mg-dependent manner) and forms homo-multimers.","method":"Baculovirus expression, glycerol-gradient sedimentation, in vitro helicase and ATPase assay","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro biochemical assay, single lab, single paper confirming helicase activity","pmids":["19451148"],"is_preprint":false},{"year":2010,"finding":"RecQ4's ATP-dependent helicase activity resides in the conserved helicase domain (Walker A K→A mutation abolishes helicase and ATPase but not annealing); helicase activity is stimulated by RPA; unwinding is independent of strand annealing and does not require excess ssDNA.","method":"In vitro helicase/ATPase/annealing assays with purified RecQ4 and Walker A point mutant","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro reconstitution with active-site mutagenesis and multiple substrates, single lab","pmids":["20451470"],"is_preprint":false},{"year":2009,"finding":"Drosophila RecQ4 has a 3'-5' DNA helicase activity dependent on ATP hydrolysis; a Walker A K→A point mutation abolishes helicase and ATPase but retains annealing; helicase-dead transgenes fail to rescue a recq4 null lethal mutation in flies, demonstrating helicase activity is essential in vivo.","method":"Baculovirus expression, in vitro ATPase/helicase/annealing assays, site-directed mutagenesis, Drosophila genetic complementation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with mutagenesis plus in vivo genetic rescue assay","pmids":["19759018"],"is_preprint":false},{"year":2010,"finding":"RECQL4 (but not the other three RecQ helicases tested) associates with human replication origins in a cell-cycle-regulated manner: recruited at late G1 after ORC/MCM assembly, augmented at S-phase onset, and lost after initiation; RECQL4 depletion reduces origin firing frequency and nascent-strand DNA synthesis.","method":"Chromatin immunoprecipitation (ChIP) at defined replication origins, cell-cycle synchronization, DNA fiber assay, siRNA depletion","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP with cell-cycle synchronization and functional depletion readout, two orthogonal methods","pmids":["20065033"],"is_preprint":false},{"year":2005,"finding":"Endogenous RECQL4 forms discrete nuclear foci that colocalize with PML bodies; after DSB induction it colocalizes with RAD51 foci and ssDNA, and co-immunoprecipitates with RAD51, implicating RECQL4 in homologous recombination-mediated DSB repair.","method":"Immunofluorescence, siRNA knockdown, Co-IP in human cells, laser-induced DSB","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal co-IP with RAD51 and colocalization, but no direct repair assay, single lab","pmids":["16141230"],"is_preprint":false},{"year":2008,"finding":"RecQ4 directly interacts with XPA (nucleotide excision repair factor); this interaction is stimulated by UV irradiation; RecQ4 forms UV-specific nuclear foci colocalizing with XPA and is required for efficient removal of UV-induced lesions.","method":"Co-IP, immunofluorescence colocalization, cellular fractionation, NER functional assay (UV survival/lesion removal in RecQ4-deficient cells)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct co-IP, colocalization, and functional complementation, single lab","pmids":["18693251"],"is_preprint":false},{"year":2009,"finding":"RECQL4 stimulates the apurinic endonuclease activity of APE1, the strand displacement activity of DNA polymerase β, and FEN1 flap endonuclease activity in vitro; in cells RECQL4 colocalizes with APE1 and FEN1 after H2O2 treatment, supporting a direct role in base excision repair.","method":"In vitro enzymatic stimulation assays, immunofluorescence colocalization in oxidatively stressed cells, RECQL4-deficient primary fibroblasts","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro biochemical reconstitution plus cell-based colocalization and functional readout, single lab","pmids":["19567405"],"is_preprint":false},{"year":2004,"finding":"RECQL4 forms a stable complex with ubiquitin ligases UBR1 and UBR2 (N-end rule pathway) in HeLa cells; the complex retains DNA-stimulated ATPase activity but lacks detectable helicase/translocase activity; RECQL4 in the complex is not ubiquitylated and is a long-lived protein.","method":"Affinity purification/co-IP from HeLa cell extracts, in vitro ATPase and helicase assays with complex","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — biochemical purification and in vitro assay, single lab, no orthogonal method for complex integrity","pmids":["15317757"],"is_preprint":false},{"year":2006,"finding":"A nuclear localization domain resides within amino acids 363–492 of RECQL4 (N-terminus); a 22-aa basic region (365–386) is sufficient for nuclear import of a GFP reporter, and exon 7 (aa 420–463, RAPADILINO deletion) encodes a nuclear retention domain containing a conserved VLPLY motif.","method":"GFP fusion constructs in mammalian cells, leptomycin B treatment, deletion mapping","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — domain mapping by deletion analysis in cells, multiple constructs, single lab","pmids":["17250975"],"is_preprint":false},{"year":2006,"finding":"RECQL4 accumulates in nucleoli specifically in response to oxidative stress (H2O2 or streptonigrin); it interacts with PARP-1 (identified by T7 phage display and confirmed biochemically), and PARP-1 inhibition blocks nucleolar relocalization; the C-terminal portion of RECQL4 is an in vitro substrate for PARP-1.","method":"Live-cell imaging with GFP fusions, phage display screen, in vitro PARP-1 substrate assay, PARP-1 inhibitor treatment","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — multiple methods (phage display, biochemical assay, imaging), single lab","pmids":["16949575"],"is_preprint":false},{"year":2009,"finding":"p300 histone acetyltransferase directly interacts with RECQL4 in vivo and in vitro and acetylates RECQL4 at lysine residues 376, 380, 382, 385, and/or 386 within its nuclear localization motif; acetylation by p300 causes redistribution of RECQL4 from nucleus to cytoplasm by preventing nuclear import.","method":"Co-IP (in vivo and in vitro), site-directed mutagenesis of acetylation sites, subcellular fractionation, acetylation assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, in vitro acetylation assay, mutagenesis of target lysines, functional consequence on localization, single lab","pmids":["19299466"],"is_preprint":false},{"year":2010,"finding":"RECQL4 is recruited rapidly to laser-induced DSBs in live cells and the N-terminal domain (aa 363–492) mediates DSB recruitment; recruitment is independent of WRN, BLM, or ATM. RECQL4-deficient fibroblasts accumulate more γH2AX and 53BP1 foci after γ-irradiation.","method":"Real-time laser confocal microscopy in live cells, domain mapping with deletion constructs, γH2AX/53BP1 immunofluorescence in RECQL4-deficient fibroblasts","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — live-cell imaging with domain mapping and epistasis to WRN/BLM/ATM, single lab","pmids":["20222902"],"is_preprint":false},{"year":2012,"finding":"RECQL4 localizes to mitochondria in human and mouse cells (confirmed by microscopy and cellular fractionation); RECQL4-deficient cells accumulate mtDNA damage and show reduced mitochondrial reserve capacity; mitochondrial polymerase γ inhibits RECQL4 helicase activity in biochemical assays.","method":"Fluorescence microscopy, cellular fractionation, Q-PCR for mtDNA damage, Seahorse bioenergetics assay, in vitro helicase inhibition assay","journal":"Aging cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fractionation, microscopy, mtDNA damage assay, biochemistry), replicated in human and mouse cells","pmids":["22296597"],"is_preprint":false},{"year":2012,"finding":"RECQL4 physically interacts with p53 exclusively in the absence of DNA damage; N-terminal amino acids 1–84 of RECQL4 encode a mitochondrial localization signal that transports the RECQL4-p53 complex to mitochondria, masking the p53 NLS; DNA damage disrupts the interaction, allowing nuclear p53 accumulation. RECQL4 also promotes de novo mtDNA replication.","method":"Co-IP, deletion mapping, mitochondrial fractionation, immunofluorescence, de novo mtDNA replication assay in patient and complemented cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, domain mutant (Δ84), functional rescue, multiple orthogonal methods, single lab","pmids":["22357944"],"is_preprint":false},{"year":2011,"finding":"RECQL4 localizes to telomeres and physically associates with shelterin proteins TRF1 and TRF2; purified RECQL4 resolves telomeric D-loop structures, stimulated by TRF1, TRF2, and POT1; it cooperates synergistically with WRN in D-loop unwinding. RECQL4-depleted cells accumulate telomeric fragile sites, sister chromosome exchanges, and DSBs.","method":"Co-IP/pulldown with recombinant shelterin proteins, in vitro D-loop unwinding assay, telomere FISH, ChIP at telomeres","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro reconstitution with purified proteins, ChIP, and cytological readout, multiple methods","pmids":["22039056"],"is_preprint":false},{"year":2012,"finding":"RECQL4 physically and functionally interacts with BLM; the interaction maps to RECQL4 aa 361–478 (N-terminus) and BLM aa 1–902; RECQL4 stimulates BLM helicase activity on fork substrates in vitro; interaction is enhanced in S phase and after ionizing radiation; RECQL4 depletion in BLM-deficient cells increases SCE frequency.","method":"Co-IP (in vivo and in vitro), in vitro helicase stimulation assay, cell-cycle synchronization, SCE assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reciprocal co-IP, in vitro functional stimulation, cell-cycle and damage conditions, single lab","pmids":["22544709"],"is_preprint":false},{"year":2013,"finding":"Both RECQL4 and p53 interact with mitochondrial polymerase γ (PolγA/B2) subunits; RECQL4 binds exonuclease and polymerase domains of PolγA and enhances PolγA DNA binding, thereby potentiating its exonuclease and polymerization activities.","method":"Co-IP/pulldown with recombinant proteins, kinetic binding analysis, in vitro polymerase and exonuclease activity assays","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified recombinant proteins, kinetics, functional stimulation assay, single lab","pmids":["24067899"],"is_preprint":false},{"year":2014,"finding":"RECQL4 participates in NHEJ: it interacts with Ku70/Ku80 heterodimer via its N-terminal domain, stimulates higher-order DNA binding of Ku70/Ku80 to blunt-ended DNA in vitro, and its depletion reduces end-joining activity both in cell extracts (in vitro NHEJ assay) and on a GFP reporter in vivo.","method":"Co-IP (RECQL4-Ku70/Ku80), in vitro NHEJ assay, GFP reporter NHEJ assay in cells, siRNA knockdown, γH2AX/53BP1 foci","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro NHEJ reconstitution, in vivo reporter assay, co-IP, multiple methods, single lab","pmids":["24942867"],"is_preprint":false},{"year":2016,"finding":"RECQL4 promotes DNA end resection in HR-mediated DSB repair: it physically interacts with MRE11-RAD50-NBS1 (MRN) complex and with CtIP (via its N-terminal domain); MRE11 exonuclease activity regulates RECQL4 retention at DSBs; RECQL4 promotes CtIP recruitment to MRN at DSBs; helicase-inactive RECQL4 impairs end processing without affecting MRE11/CtIP binding.","method":"Co-IP in cells, laser-induced DSB imaging, HR reporter assay, resection assay, helicase-inactive mutant, siRNA depletion","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP, laser DSB imaging, functional HR reporter, mutagenesis separating binding from catalytic function, multiple methods","pmids":["27320928"],"is_preprint":false},{"year":2016,"finding":"RECQL4 physically interacts with transcription factor YB1 and promotes MDR1 transcription through an AKT-YB1-MDR1 axis; RECQL4 knockdown suppresses YB1 phosphorylation and MDR1 expression, re-sensitizing cisplatin-resistant gastric cancer cells.","method":"Co-IP (RECQL4-YB1), siRNA/ectopic expression, Western blot for pYB1 and MDR1, cisplatin sensitivity assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-IP and functional gain/loss-of-function with pathway readout, single lab","pmids":["27013200"],"is_preprint":false},{"year":2012,"finding":"Two nuclear export signals (NES; pNES2 and pNES3) at the C-terminus of RecQL4 mediate its cytoplasmic/mitochondrial localization; deletion of pNES2 markedly reduces cytoplasmic RecQL4; NES-mediated cytoplasmic RecQL4 is required for maintenance of mtDNA copy number and protection against mitochondrial oxidative DNA damage.","method":"GFP-tagged deletion constructs, subcellular fractionation, immunofluorescence, mtDNA copy number assay, mitochondrial superoxide measurement","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — domain-deletion localization mapping with functional mtDNA readout, single lab","pmids":["22824301"],"is_preprint":false},{"year":2011,"finding":"The N-terminal region of RECQL4 (aa 1–496), lacking the helicase domain, is both necessary and sufficient for vertebrate cell viability in DT40 cells; smaller N-terminal fragments do not rescue; cells complemented only with this N-terminal region show increased sensitivity to DSB-inducing and crosslink agents, indicating the helicase domain contributes to repair.","method":"Conditional DT40 RECQL4 knockout (doxycycline-inducible), rescue with domain truncation constructs, cell viability and DNA damage sensitivity assays","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with domain-rescue experiments, functional readout, single lab","pmids":["21256165"],"is_preprint":false},{"year":2014,"finding":"The N-terminal intrinsically disordered region of RecQL4 mediates strong strand-annealing activity, ATP-independent strand exchange, and exhibits remarkably high affinity for G-quadruplex (G4) DNA (≥60-fold preference over other structures); multiple DNA-binding sites exist within this domain.","method":"Purified N-terminal RecQL4 fragments from E. coli, in vitro annealing/strand-exchange assays, fluorescence binding assays, biophysical characterization","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with purified domains, multiple substrates and quantitative binding measurements, single lab","pmids":["25336622"],"is_preprint":false},{"year":2012,"finding":"The first 54 amino acids of RecQL4 form a homeodomain-like fold (structure solved by NMR; PDB 2KMU) and constitute the minimum interaction region with TopBP1; this domain binds branched DNA preferentially over dsDNA or ssDNA.","method":"NMR structure determination, pulldown/binding assays with TopBP1, DNA binding assays with various substrates","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional validation (binding assays), single lab","pmids":["22730300"],"is_preprint":false},{"year":2014,"finding":"A region of RECQL4 (aa 322–400) has very high affinity for Holliday junctions among branched DNA substrates; the N-terminus contains two additional DNA-binding sites that cooperate to promote strand annealing; these activities may contribute to processing replication/recombination intermediates.","method":"Purified recombinant RECQL4 fragments, in vitro DNA-binding assays (EMSA), annealing assays","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro binding assay with domain fragments, single lab, no cellular validation","pmids":["25769792"],"is_preprint":false},{"year":2015,"finding":"RecQL4 is required for origin-associated binding of Mcm10 and Ctf4 in human cells; CDK and DDK activity is needed for this association; RECQL4-dependent Mcm10/Ctf4 origin recruitment is checkpoint-sensitive; the RECQL4–MCM10 interaction is important for efficient origin firing (demonstrated with MCM10-binding-deficient RECQL4 mutants) but is not required for vertebrate cell viability.","method":"ChIP at replication origins, siRNA/dominant-negative experiments, CDK/DDK inhibitors, interaction-deficient RECQL4 mutants in DT40 cells","journal":"Cell cycle (Georgetown, Tex.) / Oncotarget","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP, genetic rescue with interaction-deficient mutants, pharmacological epistasis, two independent papers converging on same conclusion","pmids":["25602958","26588054"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of human RecQ4 (ATPase core + novel C-terminal domain) reveals a zinc-binding site and two winged-helix domains distinct from canonical RQC; functional analysis shows these WH domains are not required for DNA binding or helicase activity, suggesting a helicase mechanism more related to bacterial RecQ than to other human family members.","method":"X-ray crystallography, site-directed mutagenesis, in vitro helicase/ATPase assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure combined with mutagenesis and in vitro functional assays, single lab","pmids":["28653661"],"is_preprint":false},{"year":2016,"finding":"Human RecQ4 contains a functional RecQ C-terminal region (RQC) with two zinc clusters and a winged-helix domain; mutagenesis of conserved RQC residues (zinc ligands, β-hairpin aromatic residue) reduces DNA binding, unwinding, and annealing; SAXS indicates a DNA-interaction mode similar to RecQ1.","method":"Inductively coupled plasma-AES (zinc detection), site-directed mutagenesis, in vitro helicase/ATPase/annealing assays, SAXS","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of active-site residues, multiple in vitro functional assays, structural data (SAXS), single lab","pmids":["27998982"],"is_preprint":false},{"year":2018,"finding":"RECQL4 physically interacts with Aurora B kinase (AURKB) via its N-terminus (binding to the AURKB catalytic domain) and stabilizes AURKB by inhibiting its ubiquitination; RECQL4 suppression reduces AURKB levels leading to mitotic irregularities and apoptosis; ectopic AURKB rescues these defects.","method":"Co-IP (RECQL4-AURKB), domain mapping, ubiquitination assay, siRNA knockdown, rescue with ectopic AURKB, flow cytometry, microscopy","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-IP, ubiquitination assay, genetic rescue, single lab","pmids":["30206236"],"is_preprint":false},{"year":2019,"finding":"RECQL4 is a microtubule-associated protein (MAP) that localizes to the mitotic spindle; its depletion in Xenopus egg extracts and HeLa cells causes chromosome misalignment, increased inter-kinetochore distance, and delayed mitotic progression without affecting spindle assembly; these mitotic roles are independent of RECQL4's DNA replication and repair functions.","method":"Immunofluorescence (spindle localization), Xenopus egg extract depletion, kinetochore distance measurement, RECQL4 patient fibroblasts, HeLa siRNA knockdown, live-cell imaging","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-free system depletion, patient cells, and HeLa knockdown with quantitative mitotic phenotype, multiple systems","pmids":["30718377"],"is_preprint":false},{"year":2019,"finding":"ATP-dependent helicase activity of Recql4 (Walker A K525A knock-in) is dispensable for embryonic development, hematopoiesis, body weight, and physiological DNA damage repair in mice; in contrast, C-terminal truncation mutations that abolish the helicase and C-terminal domain cause profound bone marrow failure, demonstrating that non-helicase C-terminal functions are essential.","method":"CRISPR/knock-in mouse (K525A helicase-dead), truncating knock-in alleles (G522Efs, R347*), hematopoietic phenotyping, DNA damage assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knock-in mouse models with genetic separation of helicase vs. C-terminal domain functions, multiple alleles","pmids":["31276497"],"is_preprint":false},{"year":2019,"finding":"Tethering of RecQL4 (or its N-terminus) to pre-replicative complexes via Orc4 fusion induces early activation of late origins; CDK phosphorylation of the RecQL4 N-terminus is required for And-1/GINS recruitment to origins, but not for Cdc45 recruitment; forced origin activation causes replication stress (ssDNA accumulation) exacerbated by transcription-replication conflicts.","method":"Orc4-RecQL4 fusion tethering, CDK inhibitor experiments, ChIP for replication factors, DNA fiber assay, ssDNA detection","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — tethering approach with pharmacological inhibition and ChIP, single lab","pmids":["31519754"],"is_preprint":false},{"year":2020,"finding":"RECQL4 physically and functionally interacts with OGG1 (8-oxoG glycosylase); RECQL4 promotes OGG1 catalytic activity; RECQL4 deficiency impairs 8-oxoG repair; oxidative stress increases RECQL4 acetylation and its interaction with OGG1; SIRT1 deacetylates RECQL4 in vitro and in cells, thereby controlling RECQL4-OGG1 interaction and BER of 8-oxoG.","method":"Co-IP (RECQL4-OGG1), in vitro OGG1 activity assay, genomic 8-oxoG quantification, acetylation assay, in vitro SIRT1 deacetylation assay, cell-based SIRT1 experiments","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — co-IP, in vitro functional stimulation, in vitro and in vivo acetylation/deacetylation assays, multiple methods, single lab","pmids":["32432680"],"is_preprint":false},{"year":2022,"finding":"UBE2O mediates multi-monoubiquitination of RECQL4, leading to its proteasomal degradation; ubiquitination attenuates RECQL4 interactions with MRN and CtIP, thereby inhibiting HR-mediated DSB repair; USP7 deubiquitinase counteracts UBE2O by stabilizing RECQL4 and restoring HR function.","method":"Co-IP (RECQL4-UBE2O and RECQL4-USP7), ubiquitination assay in cells, HR reporter assay, interaction mapping with MRN/CtIP","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-IP, cellular ubiquitination assay, functional HR reporter, single lab","pmids":["34921745"],"is_preprint":false},{"year":2021,"finding":"RNF8 (RING finger ubiquitin E3 ligase) directly interacts with RECQL4 and ubiquitinates RECQL4 at K876, K1048, and K1101, facilitating RECQL4 dissociation from DSB sites; a RECQL4 ubiquitination-site mutant shows prolonged DSB retention and blocks CtIP/Ku80 recruitment; WRAP53β enhances the RECQL4-RNF8 interaction and promotes RNF8 recruitment to DSBs.","method":"Co-IP, in vitro/in vivo ubiquitination assay, laser DSB imaging, site-directed mutagenesis of ubiquitin acceptor sites, siRNA knockdown","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-IP, site-specific mutagenesis, in vivo ubiquitination, laser DSB imaging, single lab","pmids":["33674555"],"is_preprint":false},{"year":2022,"finding":"RECQL4 directly interacts with DNA-PKcs (interaction increases after IR); RECQL4 promotes DNA end bridging by DNA-PKcs and Ku70/80 in vitro and stabilizes NHEJ factors at DSBs in vivo; DNA-PKcs phosphorylates RECQL4 at six S/T residues; blocking these phosphorylation sites reduces RECQL4 DSB recruitment, weakens NHEJ complex interactions, and decreases NHEJ efficiency.","method":"Co-IP, in vitro end-bridging assay, in vitro kinase assay (DNA-PKcs phosphorylation of RECQL4), phospho-site mutagenesis, NHEJ reporter assay, NHEJ factor colocalization at DSBs","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay, mutagenesis of phosphorylation sites, in vitro and in vivo NHEJ functional assays, co-IP, single lab","pmids":["35580045"],"is_preprint":false},{"year":2014,"finding":"RECQ4 forms protein complexes with PP2A and NPM in the nucleus, and with mitochondrial p32 in the cytoplasm; p32 interaction negatively controls transport of RECQ4 and MCM10 from nucleus to mitochondria; a RAPADILINO cancer-associated RECQ4 deletion mutant cannot bind p32, accumulates in mitochondria, interacts with mitochondrial helicase PEO1, and induces abnormally high mtDNA synthesis.","method":"Co-IP/biochemical fractionation, subcellular localization assays, mtDNA synthesis measurement, interaction mapping with deletion mutants","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-IP with fractionation and functional mtDNA readout, single lab","pmids":["24746816"],"is_preprint":false},{"year":2012,"finding":"The RAPADILINO RECQL4 mutant protein (exon 7 deletion, p.Ala420-Ala463del) retains strand annealing activity but completely lacks helicase and ssDNA-stimulated ATPase activity, providing biochemical basis for genotype-phenotype relationships in RECQL4 syndromes.","method":"Bacterial expression and purification of RAPADILINO mutant protein, in vitro strand annealing, helicase, and ATPase assays","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro biochemical characterization of disease mutant protein, single lab","pmids":["22885111"],"is_preprint":false},{"year":2016,"finding":"Structural and biochemical characterization of the Zn knuckle domain within the N-terminal region of RecQL4 (Xenopus and human): the Xenopus fragment forms a canonical Zn knuckle fold (by NMR); both human and Xenopus fragments bind various nucleic acid substrates with mild RNA preference; an upstream conserved positively charged region strongly enhances nucleic acid binding.","method":"NMR spectroscopy (Xenopus fragment structure), in vitro nucleic acid binding assays, domain analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR structure and binding assays, single lab, no in vivo validation","pmids":["26888063"],"is_preprint":false},{"year":2023,"finding":"A positively charged intrinsically disordered region (IDR) in human RECQ4 forms coacervates specifically with G-quadruplex (G4) DNA via charge-driven polyelectrolyte complexation; the IDR also forms a distinct ordered complex with RPA, and the two binding modes are mutually exclusive, suggesting regulatory molecular handoffs.","method":"In vitro binding/coacervation assays, global kinetic/thermodynamic modeling, fluorescence titration, NMR","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative biophysical reconstitution with multiple methods (fluorescence, NMR, kinetic modeling), single lab","pmids":["37875529"],"is_preprint":false},{"year":2014,"finding":"Yeast Hrq1 (budding yeast RecQ4 ortholog) is a robust 3'-5' DNA helicase with DEAH-box ATPase activity; it forms heptameric rings; helicase activity is required for ICL repair but not for suppression of de novo telomere addition; Hrq1 affects telomere length by a non-catalytic mechanism and binds telomeres in vivo.","method":"In vitro helicase/ATPase assays, EM structural analysis, genetic epistasis in yeast, ChIP at telomeres, telomere length assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro reconstitution, EM structure, genetic epistasis, ChIP, single lab","pmids":["24440721"],"is_preprint":false},{"year":2005,"finding":"p53 represses RECQL4 transcription in a HDAC1-dependent manner: wild-type (but not tumor-derived mutant) p53 represses RECQL4 promoter activity; repression correlates with HDAC1 accumulation and loss of SP1 and p53 binding at the RECQL4 promoter; TSA (HDAC inhibitor) attenuates repression.","method":"RECQL4 promoter-reporter assays, chromatin immunoprecipitation (ChIP) for HDAC1/SP1/p53 at promoter, TSA treatment, comparison of wild-type vs. mutant p53","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — promoter reporter plus ChIP, pharmacological inhibition, multiple p53 variants tested, single lab","pmids":["15674334"],"is_preprint":false},{"year":2015,"finding":"Loss of Recql4 in skeletal progenitors activates p53 in affected tissues; genetic inactivation of Trp53 rescues the skeletal phenotypes (limb abnormalities, craniosynostosis, growth plate defects) in Recql4 conditional knockout mice, establishing an epistatic in vivo interaction between RECQL4 and p53 during skeletogenesis.","method":"Conditional knockout mice (Prx1-Cre and Col2a1-Cre), double Recql4/Trp53 knockout, histology, p53 target gene expression","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in mouse via double conditional KO, clear rescue phenotype, single lab","pmids":["25556649"],"is_preprint":false},{"year":2016,"finding":"RECQL4 mitochondrial functions are required for normal F1F0-ATP synthase activity, mitochondrial membrane potential, and ROS homeostasis; loss of mitochondrial RECQL4 leads to aerobic glycolysis and increased cell invasiveness; the mechanism involves diminished SIRT3 activity and accumulation of catalytically inactive SOD2.","method":"Isogenic cell lines with/without mitochondrial RECQL4 localization, ATP synthase activity assay, membrane potential measurement, ROS measurement, SIRT3/SOD2 activity assays, invasion assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic cell lines with mechanistic pathway analysis, multiple biochemical readouts, single lab","pmids":["26906415"],"is_preprint":false},{"year":2014,"finding":"Somatic deletion of Recql4 in mouse hematopoietic cells causes rapid bone marrow failure with increased apoptosis in multipotent progenitors, failed HSC transplantability, and impaired cell-cycle progression; concurrent p53 deletion (which rescues BLM deficiency) does not rescue Recql4 loss; a helicase-inactive RECQL4 variant fully rescues hematopoietic defects, demonstrating the essential function is helicase-independent.","method":"Conditional Recql4 knockout mice (hematopoietic Cre), bone marrow transplantation, Recql4/Trp53 double KO, complementation with helicase-inactive RECQL4, flow cytometry, cell-cycle analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse, genetic epistasis with p53, rescue with helicase-inactive variant, multiple independent experiments","pmids":["24960165"],"is_preprint":false},{"year":2012,"finding":"The helicase domain and C-terminus of human RECQL4 are required for efficient replication elongation on ionizing-radiation-damaged templates; RECQL4ΔC/ΔC cells show IR hypersensitivity and premature replication fork stalling specifically after IR but not after hydroxyurea, distinguishing RECQL4's role from that of BLM.","method":"Targeted gene disruption (RECQL4ΔC/ΔC Nalm-6 cells), cell survival assay, DNA fiber assay, S-phase progression analysis","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic targeted cells, functional replication assay, epistasis to BLM, single lab","pmids":["22508716"],"is_preprint":false}],"current_model":"RECQL4 is a multifunctional RecQ family DNA helicase with an N-terminal Sld2-like domain that drives DNA replication initiation (by recruiting the CMG complex and replicative factors including DNA polymerase α, Mcm10, Cdc45, and GINS at origins in a CDK/DDK-dependent manner), a conserved 3'-5' helicase domain that unwinds a broad range of substrates (including forks, D-loops, Holliday junctions, and G-quadruplexes) independently of strand annealing, and a C-terminal domain that facilitates repair of radiation-induced replication blocks; it is post-translationally regulated by p300-mediated acetylation (controlling nuclear–cytoplasmic shuttling), DNA-PKcs-mediated phosphorylation (promoting NHEJ factor stabilization at DSBs), RNF8-mediated ubiquitination (controlling dissociation from DSBs), UBE2O/USP7 ubiquitination/deubiquitination (controlling HR capacity), and SIRT1-mediated deacetylation (modulating OGG1 interaction and BER); it localizes to the nucleus, telomeres, the mitotic spindle, and mitochondria, where it maintains mtDNA integrity by acting as an accessory factor for polymerase γ and transporting p53 to mitochondrial nucleoids; it participates in HR (promoting CtIP recruitment to MRN at DSBs), NHEJ (interacting with Ku70/Ku80 and DNA-PKcs), NER (interacting with XPA), BER (stimulating APE1, pol β, and FEN1), and telomere maintenance (resolving D-loops with shelterin proteins TRF1, TRF2, and POT1)."},"narrative":{"mechanistic_narrative":"RECQL4 is a multifunctional RecQ-family enzyme that couples DNA replication initiation to genome maintenance through functionally separable N-terminal and helicase/C-terminal modules [PMID:15960976, PMID:19177149, PMID:21256165]. Its N-terminal Sld2-like domain is the engine of origin firing: it is essential for replication initiation in egg extracts, loading onto chromatin after pre-RC assembly but before replicative polymerases, where it physically engages TopBP1/Cut5 through a homeodomain-like fold in its first 54 residues and drives chromatin loading of DNA polymerase alpha [PMID:15960976, PMID:16782873, PMID:22730300]. In human cells RECQL4 associates with replication origins in a cell-cycle- and CDK/DDK-regulated manner, is required for assembly of the CMG (Cdc45-MCM2-7-GINS) helicase and for origin recruitment of MCM10 and Ctf4/And-1, and promotes efficient origin firing [PMID:19696745, PMID:19805216, PMID:20065033, PMID:25602958, PMID:26588054, PMID:31519754]. The conserved central domain confers ATP-dependent 3'-5' helicase activity that unwinds duplex and branched substrates, while a structurally distinct C-terminal region containing zinc clusters and winged-helix elements contributes to DNA binding and unwinding [PMID:19177149, PMID:20451470, PMID:28653661, PMID:27998982]; the disordered N-terminus carries multiple DNA-binding sites mediating strand annealing, strand exchange, and high-affinity recognition of G-quadruplex and Holliday-junction structures [PMID:25336622, PMID:25769792, PMID:37875529]. RECQL4 participates broadly in DNA repair, promoting end resection in homologous recombination through interactions with the MRN complex and CtIP [PMID:27320928], supporting non-homologous end joining via Ku70/Ku80 and DNA-PKcs [PMID:24942867, PMID:35580045], assisting nucleotide excision repair through XPA [PMID:18693251], and stimulating base excision repair enzymes APE1, pol beta, FEN1, and OGG1 [PMID:19567405, PMID:32432680]. It also localizes to telomeres, where it resolves D-loops in cooperation with shelterin proteins and WRN [PMID:22039056], and to mitochondria, where it maintains mtDNA integrity as an accessory factor for polymerase gamma and shuttles p53 to mitochondrial nucleoids [PMID:22296597, PMID:22357944, PMID:24067899]. A separate, replication- and repair-independent role positions RECQL4 on the mitotic spindle as a microtubule-associated protein required for chromosome alignment [PMID:30718377]. RECQL4 activity and localization are governed by post-translational modification, including p300 acetylation that controls nuclear-cytoplasmic shuttling, DNA-PKcs phosphorylation that promotes NHEJ-factor stabilization, RNF8 and UBE2O/USP7 ubiquitination that control DSB dissociation and HR capacity, and SIRT1 deacetylation that tunes OGG1-dependent base excision repair [PMID:19299466, PMID:32432680, PMID:34921745, PMID:33674555, PMID:35580045]. Genetic models establish that the helicase activity is dispensable for viability and hematopoiesis whereas the non-helicase N-terminal and C-terminal functions are essential, with C-terminal truncations causing bone marrow failure [PMID:31276497, PMID:24960165], and that RECQL4 loss is epistatic to p53 activation during skeletogenesis [PMID:25556649].","teleology":[{"year":2005,"claim":"Established that RECQL4 functions in DNA replication initiation rather than acting solely as a repair helicase, by placing it temporally between pre-RC assembly and origin unwinding.","evidence":"Xenopus egg extract immunodepletion/add-back with chromatin fractionation epistasis (xRTS homolog)","pmids":["15960976"],"confidence":"High","gaps":["Did not identify the molecular partners mediating origin recruitment","Left open which domain carries the essential initiation activity"]},{"year":2006,"claim":"Localized the essential replication-initiation activity to the N-terminal non-helicase domain and identified TopBP1/Cut5 as its physical partner, defining a Sld2-like origin-firing module distinct from the helicase.","evidence":"Xenopus extract domain rescue, co-IP with Cut5, polymerase alpha loading assay; later refined by NMR of the first 54 residues binding TopBP1 and branched DNA","pmids":["16782873","22730300"],"confidence":"High","gaps":["Did not resolve the full set of replicative factors downstream of TopBP1 binding","Structural basis of polymerase alpha loading unresolved"]},{"year":2009,"claim":"Resolved the long-standing question of whether RECQL4 is a true helicase and tied it mechanistically to the replicative machinery, showing it is required for CMG assembly and MCM10/Ctf4 origin recruitment.","evidence":"In vitro helicase assays with purified protein and domain/Walker A mutants; co-IP and ChIP placing RECQL4 in a chromatin complex with MCM2-7/CDC45/GINS/MCM10; BiFC and ChIP at human origins with CDK/DDK inhibition","pmids":["19177149","19696745","19805216","20065033","20451470","19759018","25602958"],"confidence":"High","gaps":["Conflicting early reports on helicase activity reflect substrate/preparation dependence","How CMG assembly is coordinated with helicase catalysis at origins not fully defined"]},{"year":2011,"claim":"Extended RECQL4 function to repair and telomere maintenance, demonstrating direct partnerships with HR/repair factors and shelterin and biochemical stimulation of repair enzymes.","evidence":"Co-IP and colocalization with RAD51, XPA, APE1/pol beta/FEN1; in vitro D-loop unwinding with TRF1/TRF2/POT1 and WRN; telomere FISH and ChIP","pmids":["16141230","18693251","19567405","22039056","22544709"],"confidence":"High","gaps":["Relative contribution of each repair pathway in vivo not quantified","Whether helicase catalysis vs. scaffolding drives each interaction unclear"]},{"year":2012,"claim":"Defined a mitochondrial role for RECQL4, including a p53-shuttling function and modulation of polymerase gamma, expanding its genome-maintenance activity beyond the nucleus.","evidence":"Mitochondrial fractionation/microscopy, mtDNA damage and replication assays, mitochondrial localization-signal mapping, and in vitro Pol gamma binding/activity assays in patient and complemented cells","pmids":["22296597","22357944","24067899","22824301","24746816"],"confidence":"High","gaps":["How nuclear vs. mitochondrial pools are balanced under physiological conditions not fully resolved","Direct enzymatic role of RECQL4 in mtDNA replication versus accessory stimulation of Pol gamma not separated"]},{"year":2012,"claim":"Connected RECQL4 helicase and C-terminal domains to replication-stress responses and provided the biochemical basis for disease alleles by characterizing the RAPADILINO mutant.","evidence":"Isogenic RECQL4 delta-C cells with IR-specific fork stalling and DNA fiber assays; in vitro characterization of the RAPADILINO exon-7 deletion mutant","pmids":["22508716","22885111"],"confidence":"Medium","gaps":["The IR-specific fork-protection mechanism is not molecularly defined","Genotype-phenotype mapping across RECQL4 syndromes incomplete"]},{"year":2014,"claim":"Mapped the biochemical and structural logic of the N-terminus, showing intrinsically disordered DNA-binding modules confer strand annealing and exceptional G4 affinity.","evidence":"Purified N-terminal fragments in annealing/strand-exchange and quantitative binding assays; Holliday-junction binding mapping; NMR of a Zn-knuckle domain","pmids":["25336622","25769792","26888063"],"confidence":"High","gaps":["Cellular substrates of the G4/branched-DNA binding activities not established","How these binding modes integrate with helicase catalysis unknown"]},{"year":2016,"claim":"Demonstrated that RECQL4 actively promotes DSB end resection in HR by recruiting CtIP to the MRN complex, separating its catalytic and scaffolding contributions.","evidence":"Co-IP with MRN and CtIP, laser-DSB imaging, HR reporter and resection assays, helicase-inactive mutant","pmids":["27320928"],"confidence":"High","gaps":["Order of MRN/CtIP/RECQL4 assembly during resection not fully resolved","Single-lab finding without independent reconstitution"]},{"year":2017,"claim":"Provided high-resolution structural insight into the RECQL4 catalytic core and C-terminal architecture, revealing a non-canonical RQC and a mechanism more akin to bacterial RecQ.","evidence":"X-ray crystallography of the ATPase core plus C-terminal domain, SAXS, ICP-AES zinc detection, and active-site mutagenesis with in vitro helicase assays","pmids":["28653661","27998982"],"confidence":"High","gaps":["No full-length structure including the disordered N-terminus","Structural basis of substrate selectivity in cells unresolved"]},{"year":2019,"claim":"Genetically dissected which RECQL4 activities are essential in vivo, establishing that helicase catalysis is dispensable whereas non-helicase C-terminal functions are required for survival and hematopoiesis.","evidence":"CRISPR knock-in mice (K525A helicase-dead vs. truncating alleles), DT40 domain-rescue, and conditional hematopoietic knockout with helicase-inactive complementation","pmids":["31276497","24960165","21256165","31519754"],"confidence":"High","gaps":["The essential C-terminal molecular activity remains undefined","Why helicase-dead protein suffices in some tissues but not after exogenous damage unclear"]},{"year":2019,"claim":"Uncovered a replication- and repair-independent mitotic function, identifying RECQL4 as a spindle microtubule-associated protein required for chromosome alignment.","evidence":"Spindle immunofluorescence, Xenopus extract and HeLa depletion, kinetochore-distance measurement, patient fibroblasts, live-cell imaging","pmids":["30718377"],"confidence":"High","gaps":["Microtubule-binding interface not mapped","Mechanistic link between RECQL4 and kinetochore tension unresolved"]},{"year":2022,"claim":"Defined a post-translational regulatory network controlling RECQL4 localization, stability, and DSB dynamics through acetylation, phosphorylation, and ubiquitination.","evidence":"p300 acetylation and SIRT1 deacetylation assays with localization/OGG1 readouts; RNF8 and UBE2O ubiquitination plus USP7 deubiquitination with HR reporters; DNA-PKcs phosphorylation with NHEJ assays","pmids":["19299466","32432680","33674555","34921745","35580045"],"confidence":"Medium","gaps":["Crosstalk and hierarchy among the modifications not integrated","Several modification-pathway findings rest on single-lab co-IP and reporter data"]},{"year":null,"claim":"The molecular identity of the essential helicase-independent C-terminal function — required for viability and hematopoiesis yet biochemically uncharacterized — remains the central open question.","evidence":"","pmids":[],"confidence":"High","gaps":["No defined biochemical activity or essential partner attributed to the C-terminal essential function","Unclear how the spindle, mitochondrial, and replication roles are partitioned in vivo"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[4,7,8,9]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[29,30,31,46]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[4,8,33,34]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3,4,8]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[36]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,22,23,39]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[0,11]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[16]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[19,20,27]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[21]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[1,2,5,6,10,32]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12,13,24,25,39,42]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[36]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[19,20,23]}],"complexes":["CMG (Cdc45-MCM2-7-GINS) replication helicase","MRN (MRE11-RAD50-NBS1) complex","Ku70/Ku80-DNA-PKcs (NHEJ)","shelterin (TRF1/TRF2/POT1)"],"partners":["TOPBP1","MCM10","CTIP","KU70","DNA-PKCS","TRF2","OGG1","POLG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O94761","full_name":"ATP-dependent DNA helicase Q4","aliases":["DNA 3'-5' helicase RecQ4","DNA helicase, RecQ-like type 4","RecQ4","RTS","RecQ protein-like 4"],"length_aa":1208,"mass_kda":133.1,"function":"An ATP-dependent DNA helicase which unwinds dsDNA with a 3'-overhang in a 3'-5' direction (PubMed:28653661). Does not unwind more than 18 bp of dsDNA (PubMed:28653661). May modulate chromosome segregation. The N-terminal domain (residues 1-54) binds DNA Y-shaped DNA better than ss- or dsDNA (PubMed:22730300). The core helicase domain binds ssDNA (PubMed:22730300, PubMed:28653661)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/O94761/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RECQL4","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":74,"dependency_fraction":0.0945945945945946},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RECQL4","total_profiled":1310},"omim":[{"mim_id":"619368","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 14; LRRC14","url":"https://www.omim.org/entry/619368"},{"mim_id":"618625","title":"ROTHMUND-THOMSON SYNDROME, TYPE 1; RTS1","url":"https://www.omim.org/entry/618625"},{"mim_id":"615789","title":"ROTHMUND-THOMSON SYNDROME, TYPE 3; RTS3","url":"https://www.omim.org/entry/615789"},{"mim_id":"615704","title":"POIKILODERMA, HEREDITARY FIBROSING, WITH TENDON CONTRACTURES, MYOPATHY, AND PULMONARY FIBROSIS; POIKTMP","url":"https://www.omim.org/entry/615704"},{"mim_id":"615584","title":"FAMILY WITH SEQUENCE SIMILARITY 111, MEMBER B; FAM111B","url":"https://www.omim.org/entry/615584"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":23.6},{"tissue":"testis","ntpm":22.1}],"url":"https://www.proteinatlas.org/search/RECQL4"},"hgnc":{"alias_symbol":["RecQ4"],"prev_symbol":[]},"alphafold":{"accession":"O94761","domains":[{"cath_id":"1.10.10","chopping":"2-52","consensus_level":"high","plddt":91.6373,"start":2,"end":52},{"cath_id":"3.40.50.300","chopping":"468-665","consensus_level":"high","plddt":85.7623,"start":468,"end":665},{"cath_id":"3.40.50.300","chopping":"675-727_737-819","consensus_level":"high","plddt":89.4854,"start":675,"end":819},{"cath_id":"-","chopping":"1130-1208","consensus_level":"high","plddt":85.7977,"start":1130,"end":1208}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O94761","model_url":"https://alphafold.ebi.ac.uk/files/AF-O94761-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O94761-F1-predicted_aligned_error_v6.png","plddt_mean":67.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RECQL4","jax_strain_url":"https://www.jax.org/strain/search?query=RECQL4"},"sequence":{"accession":"O94761","fasta_url":"https://rest.uniprot.org/uniprotkb/O94761.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O94761/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O94761"}},"corpus_meta":[{"pmid":"10319867","id":"PMC_10319867","title":"Mutations in RECQL4 cause a subset of cases of Rothmund-Thomson syndrome.","date":"1999","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10319867","citation_count":550,"is_preprint":false},{"pmid":"15960976","id":"PMC_15960976","title":"Initiation of DNA replication requires the RECQL4 protein mutated in Rothmund-Thomson syndrome.","date":"2005","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/15960976","citation_count":244,"is_preprint":false},{"pmid":"12734318","id":"PMC_12734318","title":"Association between osteosarcoma and deleterious mutations in the RECQL4 gene in Rothmund-Thomson syndrome.","date":"2003","source":"Journal of the National Cancer Institute","url":"https://pubmed.ncbi.nlm.nih.gov/12734318","citation_count":232,"is_preprint":false},{"pmid":"18716613","id":"PMC_18716613","title":"The mutation spectrum in RECQL4 diseases.","date":"2008","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/18716613","citation_count":169,"is_preprint":false},{"pmid":"15964893","id":"PMC_15964893","title":"Revisiting the craniosynostosis-radial ray hypoplasia association: Baller-Gerold syndrome caused by mutations in the RECQL4 gene.","date":"2005","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15964893","citation_count":166,"is_preprint":false},{"pmid":"19805216","id":"PMC_19805216","title":"Assembly of the Cdc45-Mcm2-7-GINS complex in human cells requires the Ctf4/And-1, RecQL4, and Mcm10 proteins.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19805216","citation_count":162,"is_preprint":false},{"pmid":"16782873","id":"PMC_16782873","title":"The N-terminal noncatalytic region of Xenopus RecQ4 is required for chromatin binding of DNA polymerase alpha in the initiation of DNA replication.","date":"2006","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/16782873","citation_count":155,"is_preprint":false},{"pmid":"10552928","id":"PMC_10552928","title":"Rothmund-thomson syndrome responsible gene, RECQL4: genomic structure and products.","date":"1999","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/10552928","citation_count":136,"is_preprint":false},{"pmid":"16214424","id":"PMC_16214424","title":"Biochemical characterization of the RECQ4 protein, mutated in Rothmund-Thomson syndrome.","date":"2005","source":"DNA repair","url":"https://pubmed.ncbi.nlm.nih.gov/16214424","citation_count":129,"is_preprint":false},{"pmid":"10678659","id":"PMC_10678659","title":"Rothmund-Thomson syndrome due to RECQ4 helicase mutations: report and clinical and molecular comparisons with Bloom syndrome and Werner syndrome.","date":"2000","source":"American journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10678659","citation_count":125,"is_preprint":false},{"pmid":"20065033","id":"PMC_20065033","title":"Human RECQ1 and RECQ4 helicases play distinct roles in DNA replication initiation.","date":"2010","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/20065033","citation_count":120,"is_preprint":false},{"pmid":"19696745","id":"PMC_19696745","title":"MCM10 mediates RECQ4 association with MCM2-7 helicase complex during DNA replication.","date":"2009","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/19696745","citation_count":119,"is_preprint":false},{"pmid":"19177149","id":"PMC_19177149","title":"Dual DNA unwinding activities of the Rothmund-Thomson syndrome protein, RECQ4.","date":"2009","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/19177149","citation_count":110,"is_preprint":false},{"pmid":"16141230","id":"PMC_16141230","title":"The human Rothmund-Thomson syndrome gene 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mapped\",\n      \"pmids\": [\"10552928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The Xenopus RECQL4 homolog (xRTS) is essential for DNA replication initiation in egg extracts; it loads onto chromatin after pre-RC proteins but before replicative polymerases, and its depletion prevents RPA loading at origins, placing it between pre-RC assembly and origin unwinding.\",\n      \"method\": \"Xenopus egg extract depletion/add-back, chromatin fractionation, immunodepletion epistasis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal depletion/reconstitution in cell-free system with multiple orthogonal epistasis experiments, replicated in mammalian cells\",\n      \"pmids\": [\"15960976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The N-terminal non-helicase domain of Xenopus RecQ4 is necessary and sufficient for DNA replication initiation in egg extracts; it physically interacts with Cut5 (TopBP1/Dpb11 ortholog) and is required for chromatin loading of DNA polymerase alpha.\",\n      \"method\": \"Xenopus egg extract depletion/rescue with N-terminal fragments, co-immunoprecipitation with Cut5, antibody inhibition assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution in cell-free extract with domain mapping and physical interaction, multiple methods\",\n      \"pmids\": [\"16782873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Purified human RECQ4 has DNA-stimulated ATPase activity (preferentially activated by ssDNA requiring ≥60 nt for maximal stimulation; minimal binding site 20–40 nt), and strand-annealing activity inhibited by RPA; no DNA helicase activity was detected.\",\n      \"method\": \"In vitro ATPase assay, strand-annealing assay, helicase assay with purified recombinant RECQ4\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro biochemical reconstitution with purified protein, multiple substrate assays; helicase-negative finding later revised by other labs\",\n      \"pmids\": [\"16214424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RECQL4 exhibits two distinct ATP-dependent DNA unwinding activities: one from the conserved helicase motifs and one from the Sld2-like N-terminal domain, each capable of independently promoting strand separation.\",\n      \"method\": \"In vitro helicase assay with purified recombinant RECQL4 and domain deletion mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro reconstitution with domain mutants, single lab with multiple substrates\",\n      \"pmids\": [\"19177149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RECQL4 co-purifies in a chromatin-bound complex with MCM2-7, CDC45, GINS, and MCM10 from human cells; MCM10 directly interacts with RECQL4, regulates its DNA unwinding activity, and is essential for RECQL4-MCM complex integrity; complex formation and origin association are cell-cycle regulated.\",\n      \"method\": \"Biochemical purification from human cell extracts, co-IP, chromatin immunoprecipitation (ChIP), cell-cycle fractionation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, biochemical purification, ChIP, functional helicase assay with MCM10, multiple orthogonal methods\",\n      \"pmids\": [\"19696745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Assembly of the CMG (Cdc45-MCM2-7-GINS) complex in human cells requires RecQL4 (as well as Ctf4/And-1 and Mcm10); stable CMG association was detected only after G1/S transition and required CDK and Cdc7 kinase activities.\",\n      \"method\": \"Bimolecular fluorescence complementation (BiFC) in HeLa cells, siRNA depletion, CDK/DDK inhibitor treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based BiFC plus pharmacological inhibition and siRNA, multiple conditions tested\",\n      \"pmids\": [\"19805216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Purified RECQL4 expressed in insect cells exhibits 3'-5' DNA helicase activity (displaces annealed oligonucleotides in an ATP/Mg-dependent manner) and forms homo-multimers.\",\n      \"method\": \"Baculovirus expression, glycerol-gradient sedimentation, in vitro helicase and ATPase assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biochemical assay, single lab, single paper confirming helicase activity\",\n      \"pmids\": [\"19451148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RecQ4's ATP-dependent helicase activity resides in the conserved helicase domain (Walker A K→A mutation abolishes helicase and ATPase but not annealing); helicase activity is stimulated by RPA; unwinding is independent of strand annealing and does not require excess ssDNA.\",\n      \"method\": \"In vitro helicase/ATPase/annealing assays with purified RecQ4 and Walker A point mutant\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro reconstitution with active-site mutagenesis and multiple substrates, single lab\",\n      \"pmids\": [\"20451470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Drosophila RecQ4 has a 3'-5' DNA helicase activity dependent on ATP hydrolysis; a Walker A K→A point mutation abolishes helicase and ATPase but retains annealing; helicase-dead transgenes fail to rescue a recq4 null lethal mutation in flies, demonstrating helicase activity is essential in vivo.\",\n      \"method\": \"Baculovirus expression, in vitro ATPase/helicase/annealing assays, site-directed mutagenesis, Drosophila genetic complementation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with mutagenesis plus in vivo genetic rescue assay\",\n      \"pmids\": [\"19759018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RECQL4 (but not the other three RecQ helicases tested) associates with human replication origins in a cell-cycle-regulated manner: recruited at late G1 after ORC/MCM assembly, augmented at S-phase onset, and lost after initiation; RECQL4 depletion reduces origin firing frequency and nascent-strand DNA synthesis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) at defined replication origins, cell-cycle synchronization, DNA fiber assay, siRNA depletion\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with cell-cycle synchronization and functional depletion readout, two orthogonal methods\",\n      \"pmids\": [\"20065033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Endogenous RECQL4 forms discrete nuclear foci that colocalize with PML bodies; after DSB induction it colocalizes with RAD51 foci and ssDNA, and co-immunoprecipitates with RAD51, implicating RECQL4 in homologous recombination-mediated DSB repair.\",\n      \"method\": \"Immunofluorescence, siRNA knockdown, Co-IP in human cells, laser-induced DSB\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal co-IP with RAD51 and colocalization, but no direct repair assay, single lab\",\n      \"pmids\": [\"16141230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RecQ4 directly interacts with XPA (nucleotide excision repair factor); this interaction is stimulated by UV irradiation; RecQ4 forms UV-specific nuclear foci colocalizing with XPA and is required for efficient removal of UV-induced lesions.\",\n      \"method\": \"Co-IP, immunofluorescence colocalization, cellular fractionation, NER functional assay (UV survival/lesion removal in RecQ4-deficient cells)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct co-IP, colocalization, and functional complementation, single lab\",\n      \"pmids\": [\"18693251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RECQL4 stimulates the apurinic endonuclease activity of APE1, the strand displacement activity of DNA polymerase β, and FEN1 flap endonuclease activity in vitro; in cells RECQL4 colocalizes with APE1 and FEN1 after H2O2 treatment, supporting a direct role in base excision repair.\",\n      \"method\": \"In vitro enzymatic stimulation assays, immunofluorescence colocalization in oxidatively stressed cells, RECQL4-deficient primary fibroblasts\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro biochemical reconstitution plus cell-based colocalization and functional readout, single lab\",\n      \"pmids\": [\"19567405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RECQL4 forms a stable complex with ubiquitin ligases UBR1 and UBR2 (N-end rule pathway) in HeLa cells; the complex retains DNA-stimulated ATPase activity but lacks detectable helicase/translocase activity; RECQL4 in the complex is not ubiquitylated and is a long-lived protein.\",\n      \"method\": \"Affinity purification/co-IP from HeLa cell extracts, in vitro ATPase and helicase assays with complex\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — biochemical purification and in vitro assay, single lab, no orthogonal method for complex integrity\",\n      \"pmids\": [\"15317757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A nuclear localization domain resides within amino acids 363–492 of RECQL4 (N-terminus); a 22-aa basic region (365–386) is sufficient for nuclear import of a GFP reporter, and exon 7 (aa 420–463, RAPADILINO deletion) encodes a nuclear retention domain containing a conserved VLPLY motif.\",\n      \"method\": \"GFP fusion constructs in mammalian cells, leptomycin B treatment, deletion mapping\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — domain mapping by deletion analysis in cells, multiple constructs, single lab\",\n      \"pmids\": [\"17250975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RECQL4 accumulates in nucleoli specifically in response to oxidative stress (H2O2 or streptonigrin); it interacts with PARP-1 (identified by T7 phage display and confirmed biochemically), and PARP-1 inhibition blocks nucleolar relocalization; the C-terminal portion of RECQL4 is an in vitro substrate for PARP-1.\",\n      \"method\": \"Live-cell imaging with GFP fusions, phage display screen, in vitro PARP-1 substrate assay, PARP-1 inhibitor treatment\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple methods (phage display, biochemical assay, imaging), single lab\",\n      \"pmids\": [\"16949575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p300 histone acetyltransferase directly interacts with RECQL4 in vivo and in vitro and acetylates RECQL4 at lysine residues 376, 380, 382, 385, and/or 386 within its nuclear localization motif; acetylation by p300 causes redistribution of RECQL4 from nucleus to cytoplasm by preventing nuclear import.\",\n      \"method\": \"Co-IP (in vivo and in vitro), site-directed mutagenesis of acetylation sites, subcellular fractionation, acetylation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, in vitro acetylation assay, mutagenesis of target lysines, functional consequence on localization, single lab\",\n      \"pmids\": [\"19299466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RECQL4 is recruited rapidly to laser-induced DSBs in live cells and the N-terminal domain (aa 363–492) mediates DSB recruitment; recruitment is independent of WRN, BLM, or ATM. RECQL4-deficient fibroblasts accumulate more γH2AX and 53BP1 foci after γ-irradiation.\",\n      \"method\": \"Real-time laser confocal microscopy in live cells, domain mapping with deletion constructs, γH2AX/53BP1 immunofluorescence in RECQL4-deficient fibroblasts\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — live-cell imaging with domain mapping and epistasis to WRN/BLM/ATM, single lab\",\n      \"pmids\": [\"20222902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RECQL4 localizes to mitochondria in human and mouse cells (confirmed by microscopy and cellular fractionation); RECQL4-deficient cells accumulate mtDNA damage and show reduced mitochondrial reserve capacity; mitochondrial polymerase γ inhibits RECQL4 helicase activity in biochemical assays.\",\n      \"method\": \"Fluorescence microscopy, cellular fractionation, Q-PCR for mtDNA damage, Seahorse bioenergetics assay, in vitro helicase inhibition assay\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fractionation, microscopy, mtDNA damage assay, biochemistry), replicated in human and mouse cells\",\n      \"pmids\": [\"22296597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RECQL4 physically interacts with p53 exclusively in the absence of DNA damage; N-terminal amino acids 1–84 of RECQL4 encode a mitochondrial localization signal that transports the RECQL4-p53 complex to mitochondria, masking the p53 NLS; DNA damage disrupts the interaction, allowing nuclear p53 accumulation. RECQL4 also promotes de novo mtDNA replication.\",\n      \"method\": \"Co-IP, deletion mapping, mitochondrial fractionation, immunofluorescence, de novo mtDNA replication assay in patient and complemented cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, domain mutant (Δ84), functional rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"22357944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RECQL4 localizes to telomeres and physically associates with shelterin proteins TRF1 and TRF2; purified RECQL4 resolves telomeric D-loop structures, stimulated by TRF1, TRF2, and POT1; it cooperates synergistically with WRN in D-loop unwinding. RECQL4-depleted cells accumulate telomeric fragile sites, sister chromosome exchanges, and DSBs.\",\n      \"method\": \"Co-IP/pulldown with recombinant shelterin proteins, in vitro D-loop unwinding assay, telomere FISH, ChIP at telomeres\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro reconstitution with purified proteins, ChIP, and cytological readout, multiple methods\",\n      \"pmids\": [\"22039056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RECQL4 physically and functionally interacts with BLM; the interaction maps to RECQL4 aa 361–478 (N-terminus) and BLM aa 1–902; RECQL4 stimulates BLM helicase activity on fork substrates in vitro; interaction is enhanced in S phase and after ionizing radiation; RECQL4 depletion in BLM-deficient cells increases SCE frequency.\",\n      \"method\": \"Co-IP (in vivo and in vitro), in vitro helicase stimulation assay, cell-cycle synchronization, SCE assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reciprocal co-IP, in vitro functional stimulation, cell-cycle and damage conditions, single lab\",\n      \"pmids\": [\"22544709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Both RECQL4 and p53 interact with mitochondrial polymerase γ (PolγA/B2) subunits; RECQL4 binds exonuclease and polymerase domains of PolγA and enhances PolγA DNA binding, thereby potentiating its exonuclease and polymerization activities.\",\n      \"method\": \"Co-IP/pulldown with recombinant proteins, kinetic binding analysis, in vitro polymerase and exonuclease activity assays\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified recombinant proteins, kinetics, functional stimulation assay, single lab\",\n      \"pmids\": [\"24067899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RECQL4 participates in NHEJ: it interacts with Ku70/Ku80 heterodimer via its N-terminal domain, stimulates higher-order DNA binding of Ku70/Ku80 to blunt-ended DNA in vitro, and its depletion reduces end-joining activity both in cell extracts (in vitro NHEJ assay) and on a GFP reporter in vivo.\",\n      \"method\": \"Co-IP (RECQL4-Ku70/Ku80), in vitro NHEJ assay, GFP reporter NHEJ assay in cells, siRNA knockdown, γH2AX/53BP1 foci\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro NHEJ reconstitution, in vivo reporter assay, co-IP, multiple methods, single lab\",\n      \"pmids\": [\"24942867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RECQL4 promotes DNA end resection in HR-mediated DSB repair: it physically interacts with MRE11-RAD50-NBS1 (MRN) complex and with CtIP (via its N-terminal domain); MRE11 exonuclease activity regulates RECQL4 retention at DSBs; RECQL4 promotes CtIP recruitment to MRN at DSBs; helicase-inactive RECQL4 impairs end processing without affecting MRE11/CtIP binding.\",\n      \"method\": \"Co-IP in cells, laser-induced DSB imaging, HR reporter assay, resection assay, helicase-inactive mutant, siRNA depletion\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP, laser DSB imaging, functional HR reporter, mutagenesis separating binding from catalytic function, multiple methods\",\n      \"pmids\": [\"27320928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RECQL4 physically interacts with transcription factor YB1 and promotes MDR1 transcription through an AKT-YB1-MDR1 axis; RECQL4 knockdown suppresses YB1 phosphorylation and MDR1 expression, re-sensitizing cisplatin-resistant gastric cancer cells.\",\n      \"method\": \"Co-IP (RECQL4-YB1), siRNA/ectopic expression, Western blot for pYB1 and MDR1, cisplatin sensitivity assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-IP and functional gain/loss-of-function with pathway readout, single lab\",\n      \"pmids\": [\"27013200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Two nuclear export signals (NES; pNES2 and pNES3) at the C-terminus of RecQL4 mediate its cytoplasmic/mitochondrial localization; deletion of pNES2 markedly reduces cytoplasmic RecQL4; NES-mediated cytoplasmic RecQL4 is required for maintenance of mtDNA copy number and protection against mitochondrial oxidative DNA damage.\",\n      \"method\": \"GFP-tagged deletion constructs, subcellular fractionation, immunofluorescence, mtDNA copy number assay, mitochondrial superoxide measurement\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — domain-deletion localization mapping with functional mtDNA readout, single lab\",\n      \"pmids\": [\"22824301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The N-terminal region of RECQL4 (aa 1–496), lacking the helicase domain, is both necessary and sufficient for vertebrate cell viability in DT40 cells; smaller N-terminal fragments do not rescue; cells complemented only with this N-terminal region show increased sensitivity to DSB-inducing and crosslink agents, indicating the helicase domain contributes to repair.\",\n      \"method\": \"Conditional DT40 RECQL4 knockout (doxycycline-inducible), rescue with domain truncation constructs, cell viability and DNA damage sensitivity assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with domain-rescue experiments, functional readout, single lab\",\n      \"pmids\": [\"21256165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The N-terminal intrinsically disordered region of RecQL4 mediates strong strand-annealing activity, ATP-independent strand exchange, and exhibits remarkably high affinity for G-quadruplex (G4) DNA (≥60-fold preference over other structures); multiple DNA-binding sites exist within this domain.\",\n      \"method\": \"Purified N-terminal RecQL4 fragments from E. coli, in vitro annealing/strand-exchange assays, fluorescence binding assays, biophysical characterization\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with purified domains, multiple substrates and quantitative binding measurements, single lab\",\n      \"pmids\": [\"25336622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The first 54 amino acids of RecQL4 form a homeodomain-like fold (structure solved by NMR; PDB 2KMU) and constitute the minimum interaction region with TopBP1; this domain binds branched DNA preferentially over dsDNA or ssDNA.\",\n      \"method\": \"NMR structure determination, pulldown/binding assays with TopBP1, DNA binding assays with various substrates\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional validation (binding assays), single lab\",\n      \"pmids\": [\"22730300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A region of RECQL4 (aa 322–400) has very high affinity for Holliday junctions among branched DNA substrates; the N-terminus contains two additional DNA-binding sites that cooperate to promote strand annealing; these activities may contribute to processing replication/recombination intermediates.\",\n      \"method\": \"Purified recombinant RECQL4 fragments, in vitro DNA-binding assays (EMSA), annealing assays\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro binding assay with domain fragments, single lab, no cellular validation\",\n      \"pmids\": [\"25769792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RecQL4 is required for origin-associated binding of Mcm10 and Ctf4 in human cells; CDK and DDK activity is needed for this association; RECQL4-dependent Mcm10/Ctf4 origin recruitment is checkpoint-sensitive; the RECQL4–MCM10 interaction is important for efficient origin firing (demonstrated with MCM10-binding-deficient RECQL4 mutants) but is not required for vertebrate cell viability.\",\n      \"method\": \"ChIP at replication origins, siRNA/dominant-negative experiments, CDK/DDK inhibitors, interaction-deficient RECQL4 mutants in DT40 cells\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.) / Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, genetic rescue with interaction-deficient mutants, pharmacological epistasis, two independent papers converging on same conclusion\",\n      \"pmids\": [\"25602958\", \"26588054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of human RecQ4 (ATPase core + novel C-terminal domain) reveals a zinc-binding site and two winged-helix domains distinct from canonical RQC; functional analysis shows these WH domains are not required for DNA binding or helicase activity, suggesting a helicase mechanism more related to bacterial RecQ than to other human family members.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, in vitro helicase/ATPase assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with mutagenesis and in vitro functional assays, single lab\",\n      \"pmids\": [\"28653661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Human RecQ4 contains a functional RecQ C-terminal region (RQC) with two zinc clusters and a winged-helix domain; mutagenesis of conserved RQC residues (zinc ligands, β-hairpin aromatic residue) reduces DNA binding, unwinding, and annealing; SAXS indicates a DNA-interaction mode similar to RecQ1.\",\n      \"method\": \"Inductively coupled plasma-AES (zinc detection), site-directed mutagenesis, in vitro helicase/ATPase/annealing assays, SAXS\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of active-site residues, multiple in vitro functional assays, structural data (SAXS), single lab\",\n      \"pmids\": [\"27998982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RECQL4 physically interacts with Aurora B kinase (AURKB) via its N-terminus (binding to the AURKB catalytic domain) and stabilizes AURKB by inhibiting its ubiquitination; RECQL4 suppression reduces AURKB levels leading to mitotic irregularities and apoptosis; ectopic AURKB rescues these defects.\",\n      \"method\": \"Co-IP (RECQL4-AURKB), domain mapping, ubiquitination assay, siRNA knockdown, rescue with ectopic AURKB, flow cytometry, microscopy\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-IP, ubiquitination assay, genetic rescue, single lab\",\n      \"pmids\": [\"30206236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RECQL4 is a microtubule-associated protein (MAP) that localizes to the mitotic spindle; its depletion in Xenopus egg extracts and HeLa cells causes chromosome misalignment, increased inter-kinetochore distance, and delayed mitotic progression without affecting spindle assembly; these mitotic roles are independent of RECQL4's DNA replication and repair functions.\",\n      \"method\": \"Immunofluorescence (spindle localization), Xenopus egg extract depletion, kinetochore distance measurement, RECQL4 patient fibroblasts, HeLa siRNA knockdown, live-cell imaging\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-free system depletion, patient cells, and HeLa knockdown with quantitative mitotic phenotype, multiple systems\",\n      \"pmids\": [\"30718377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATP-dependent helicase activity of Recql4 (Walker A K525A knock-in) is dispensable for embryonic development, hematopoiesis, body weight, and physiological DNA damage repair in mice; in contrast, C-terminal truncation mutations that abolish the helicase and C-terminal domain cause profound bone marrow failure, demonstrating that non-helicase C-terminal functions are essential.\",\n      \"method\": \"CRISPR/knock-in mouse (K525A helicase-dead), truncating knock-in alleles (G522Efs, R347*), hematopoietic phenotyping, DNA damage assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knock-in mouse models with genetic separation of helicase vs. C-terminal domain functions, multiple alleles\",\n      \"pmids\": [\"31276497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Tethering of RecQL4 (or its N-terminus) to pre-replicative complexes via Orc4 fusion induces early activation of late origins; CDK phosphorylation of the RecQL4 N-terminus is required for And-1/GINS recruitment to origins, but not for Cdc45 recruitment; forced origin activation causes replication stress (ssDNA accumulation) exacerbated by transcription-replication conflicts.\",\n      \"method\": \"Orc4-RecQL4 fusion tethering, CDK inhibitor experiments, ChIP for replication factors, DNA fiber assay, ssDNA detection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — tethering approach with pharmacological inhibition and ChIP, single lab\",\n      \"pmids\": [\"31519754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RECQL4 physically and functionally interacts with OGG1 (8-oxoG glycosylase); RECQL4 promotes OGG1 catalytic activity; RECQL4 deficiency impairs 8-oxoG repair; oxidative stress increases RECQL4 acetylation and its interaction with OGG1; SIRT1 deacetylates RECQL4 in vitro and in cells, thereby controlling RECQL4-OGG1 interaction and BER of 8-oxoG.\",\n      \"method\": \"Co-IP (RECQL4-OGG1), in vitro OGG1 activity assay, genomic 8-oxoG quantification, acetylation assay, in vitro SIRT1 deacetylation assay, cell-based SIRT1 experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — co-IP, in vitro functional stimulation, in vitro and in vivo acetylation/deacetylation assays, multiple methods, single lab\",\n      \"pmids\": [\"32432680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UBE2O mediates multi-monoubiquitination of RECQL4, leading to its proteasomal degradation; ubiquitination attenuates RECQL4 interactions with MRN and CtIP, thereby inhibiting HR-mediated DSB repair; USP7 deubiquitinase counteracts UBE2O by stabilizing RECQL4 and restoring HR function.\",\n      \"method\": \"Co-IP (RECQL4-UBE2O and RECQL4-USP7), ubiquitination assay in cells, HR reporter assay, interaction mapping with MRN/CtIP\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-IP, cellular ubiquitination assay, functional HR reporter, single lab\",\n      \"pmids\": [\"34921745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF8 (RING finger ubiquitin E3 ligase) directly interacts with RECQL4 and ubiquitinates RECQL4 at K876, K1048, and K1101, facilitating RECQL4 dissociation from DSB sites; a RECQL4 ubiquitination-site mutant shows prolonged DSB retention and blocks CtIP/Ku80 recruitment; WRAP53β enhances the RECQL4-RNF8 interaction and promotes RNF8 recruitment to DSBs.\",\n      \"method\": \"Co-IP, in vitro/in vivo ubiquitination assay, laser DSB imaging, site-directed mutagenesis of ubiquitin acceptor sites, siRNA knockdown\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-IP, site-specific mutagenesis, in vivo ubiquitination, laser DSB imaging, single lab\",\n      \"pmids\": [\"33674555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RECQL4 directly interacts with DNA-PKcs (interaction increases after IR); RECQL4 promotes DNA end bridging by DNA-PKcs and Ku70/80 in vitro and stabilizes NHEJ factors at DSBs in vivo; DNA-PKcs phosphorylates RECQL4 at six S/T residues; blocking these phosphorylation sites reduces RECQL4 DSB recruitment, weakens NHEJ complex interactions, and decreases NHEJ efficiency.\",\n      \"method\": \"Co-IP, in vitro end-bridging assay, in vitro kinase assay (DNA-PKcs phosphorylation of RECQL4), phospho-site mutagenesis, NHEJ reporter assay, NHEJ factor colocalization at DSBs\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay, mutagenesis of phosphorylation sites, in vitro and in vivo NHEJ functional assays, co-IP, single lab\",\n      \"pmids\": [\"35580045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RECQ4 forms protein complexes with PP2A and NPM in the nucleus, and with mitochondrial p32 in the cytoplasm; p32 interaction negatively controls transport of RECQ4 and MCM10 from nucleus to mitochondria; a RAPADILINO cancer-associated RECQ4 deletion mutant cannot bind p32, accumulates in mitochondria, interacts with mitochondrial helicase PEO1, and induces abnormally high mtDNA synthesis.\",\n      \"method\": \"Co-IP/biochemical fractionation, subcellular localization assays, mtDNA synthesis measurement, interaction mapping with deletion mutants\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-IP with fractionation and functional mtDNA readout, single lab\",\n      \"pmids\": [\"24746816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The RAPADILINO RECQL4 mutant protein (exon 7 deletion, p.Ala420-Ala463del) retains strand annealing activity but completely lacks helicase and ssDNA-stimulated ATPase activity, providing biochemical basis for genotype-phenotype relationships in RECQL4 syndromes.\",\n      \"method\": \"Bacterial expression and purification of RAPADILINO mutant protein, in vitro strand annealing, helicase, and ATPase assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro biochemical characterization of disease mutant protein, single lab\",\n      \"pmids\": [\"22885111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Structural and biochemical characterization of the Zn knuckle domain within the N-terminal region of RecQL4 (Xenopus and human): the Xenopus fragment forms a canonical Zn knuckle fold (by NMR); both human and Xenopus fragments bind various nucleic acid substrates with mild RNA preference; an upstream conserved positively charged region strongly enhances nucleic acid binding.\",\n      \"method\": \"NMR spectroscopy (Xenopus fragment structure), in vitro nucleic acid binding assays, domain analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure and binding assays, single lab, no in vivo validation\",\n      \"pmids\": [\"26888063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A positively charged intrinsically disordered region (IDR) in human RECQ4 forms coacervates specifically with G-quadruplex (G4) DNA via charge-driven polyelectrolyte complexation; the IDR also forms a distinct ordered complex with RPA, and the two binding modes are mutually exclusive, suggesting regulatory molecular handoffs.\",\n      \"method\": \"In vitro binding/coacervation assays, global kinetic/thermodynamic modeling, fluorescence titration, NMR\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative biophysical reconstitution with multiple methods (fluorescence, NMR, kinetic modeling), single lab\",\n      \"pmids\": [\"37875529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Hrq1 (budding yeast RecQ4 ortholog) is a robust 3'-5' DNA helicase with DEAH-box ATPase activity; it forms heptameric rings; helicase activity is required for ICL repair but not for suppression of de novo telomere addition; Hrq1 affects telomere length by a non-catalytic mechanism and binds telomeres in vivo.\",\n      \"method\": \"In vitro helicase/ATPase assays, EM structural analysis, genetic epistasis in yeast, ChIP at telomeres, telomere length assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro reconstitution, EM structure, genetic epistasis, ChIP, single lab\",\n      \"pmids\": [\"24440721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p53 represses RECQL4 transcription in a HDAC1-dependent manner: wild-type (but not tumor-derived mutant) p53 represses RECQL4 promoter activity; repression correlates with HDAC1 accumulation and loss of SP1 and p53 binding at the RECQL4 promoter; TSA (HDAC inhibitor) attenuates repression.\",\n      \"method\": \"RECQL4 promoter-reporter assays, chromatin immunoprecipitation (ChIP) for HDAC1/SP1/p53 at promoter, TSA treatment, comparison of wild-type vs. mutant p53\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — promoter reporter plus ChIP, pharmacological inhibition, multiple p53 variants tested, single lab\",\n      \"pmids\": [\"15674334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of Recql4 in skeletal progenitors activates p53 in affected tissues; genetic inactivation of Trp53 rescues the skeletal phenotypes (limb abnormalities, craniosynostosis, growth plate defects) in Recql4 conditional knockout mice, establishing an epistatic in vivo interaction between RECQL4 and p53 during skeletogenesis.\",\n      \"method\": \"Conditional knockout mice (Prx1-Cre and Col2a1-Cre), double Recql4/Trp53 knockout, histology, p53 target gene expression\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in mouse via double conditional KO, clear rescue phenotype, single lab\",\n      \"pmids\": [\"25556649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RECQL4 mitochondrial functions are required for normal F1F0-ATP synthase activity, mitochondrial membrane potential, and ROS homeostasis; loss of mitochondrial RECQL4 leads to aerobic glycolysis and increased cell invasiveness; the mechanism involves diminished SIRT3 activity and accumulation of catalytically inactive SOD2.\",\n      \"method\": \"Isogenic cell lines with/without mitochondrial RECQL4 localization, ATP synthase activity assay, membrane potential measurement, ROS measurement, SIRT3/SOD2 activity assays, invasion assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic cell lines with mechanistic pathway analysis, multiple biochemical readouts, single lab\",\n      \"pmids\": [\"26906415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Somatic deletion of Recql4 in mouse hematopoietic cells causes rapid bone marrow failure with increased apoptosis in multipotent progenitors, failed HSC transplantability, and impaired cell-cycle progression; concurrent p53 deletion (which rescues BLM deficiency) does not rescue Recql4 loss; a helicase-inactive RECQL4 variant fully rescues hematopoietic defects, demonstrating the essential function is helicase-independent.\",\n      \"method\": \"Conditional Recql4 knockout mice (hematopoietic Cre), bone marrow transplantation, Recql4/Trp53 double KO, complementation with helicase-inactive RECQL4, flow cytometry, cell-cycle analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse, genetic epistasis with p53, rescue with helicase-inactive variant, multiple independent experiments\",\n      \"pmids\": [\"24960165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The helicase domain and C-terminus of human RECQL4 are required for efficient replication elongation on ionizing-radiation-damaged templates; RECQL4ΔC/ΔC cells show IR hypersensitivity and premature replication fork stalling specifically after IR but not after hydroxyurea, distinguishing RECQL4's role from that of BLM.\",\n      \"method\": \"Targeted gene disruption (RECQL4ΔC/ΔC Nalm-6 cells), cell survival assay, DNA fiber assay, S-phase progression analysis\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic targeted cells, functional replication assay, epistasis to BLM, single lab\",\n      \"pmids\": [\"22508716\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RECQL4 is a multifunctional RecQ family DNA helicase with an N-terminal Sld2-like domain that drives DNA replication initiation (by recruiting the CMG complex and replicative factors including DNA polymerase α, Mcm10, Cdc45, and GINS at origins in a CDK/DDK-dependent manner), a conserved 3'-5' helicase domain that unwinds a broad range of substrates (including forks, D-loops, Holliday junctions, and G-quadruplexes) independently of strand annealing, and a C-terminal domain that facilitates repair of radiation-induced replication blocks; it is post-translationally regulated by p300-mediated acetylation (controlling nuclear–cytoplasmic shuttling), DNA-PKcs-mediated phosphorylation (promoting NHEJ factor stabilization at DSBs), RNF8-mediated ubiquitination (controlling dissociation from DSBs), UBE2O/USP7 ubiquitination/deubiquitination (controlling HR capacity), and SIRT1-mediated deacetylation (modulating OGG1 interaction and BER); it localizes to the nucleus, telomeres, the mitotic spindle, and mitochondria, where it maintains mtDNA integrity by acting as an accessory factor for polymerase γ and transporting p53 to mitochondrial nucleoids; it participates in HR (promoting CtIP recruitment to MRN at DSBs), NHEJ (interacting with Ku70/Ku80 and DNA-PKcs), NER (interacting with XPA), BER (stimulating APE1, pol β, and FEN1), and telomere maintenance (resolving D-loops with shelterin proteins TRF1, TRF2, and POT1).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RECQL4 is a multifunctional RecQ-family enzyme that couples DNA replication initiation to genome maintenance through functionally separable N-terminal and helicase/C-terminal modules [#1, #4, #28]. Its N-terminal Sld2-like domain is the engine of origin firing: it is essential for replication initiation in egg extracts, loading onto chromatin after pre-RC assembly but before replicative polymerases, where it physically engages TopBP1/Cut5 through a homeodomain-like fold in its first 54 residues and drives chromatin loading of DNA polymerase alpha [#1, #2, #30]. In human cells RECQL4 associates with replication origins in a cell-cycle- and CDK/DDK-regulated manner, is required for assembly of the CMG (Cdc45-MCM2-7-GINS) helicase and for origin recruitment of MCM10 and Ctf4/And-1, and promotes efficient origin firing [#5, #6, #10, #32, #38]. The conserved central domain confers ATP-dependent 3'-5' helicase activity that unwinds duplex and branched substrates, while a structurally distinct C-terminal region containing zinc clusters and winged-helix elements contributes to DNA binding and unwinding [#4, #8, #33, #34]; the disordered N-terminus carries multiple DNA-binding sites mediating strand annealing, strand exchange, and high-affinity recognition of G-quadruplex and Holliday-junction structures [#29, #31, #46]. RECQL4 participates broadly in DNA repair, promoting end resection in homologous recombination through interactions with the MRN complex and CtIP [#25], supporting non-homologous end joining via Ku70/Ku80 and DNA-PKcs [#24, #42], assisting nucleotide excision repair through XPA [#12], and stimulating base excision repair enzymes APE1, pol beta, FEN1, and OGG1 [#13, #39]. It also localizes to telomeres, where it resolves D-loops in cooperation with shelterin proteins and WRN [#21], and to mitochondria, where it maintains mtDNA integrity as an accessory factor for polymerase gamma and shuttles p53 to mitochondrial nucleoids [#19, #20, #23]. A separate, replication- and repair-independent role positions RECQL4 on the mitotic spindle as a microtubule-associated protein required for chromosome alignment [#36]. RECQL4 activity and localization are governed by post-translational modification, including p300 acetylation that controls nuclear-cytoplasmic shuttling, DNA-PKcs phosphorylation that promotes NHEJ-factor stabilization, RNF8 and UBE2O/USP7 ubiquitination that control DSB dissociation and HR capacity, and SIRT1 deacetylation that tunes OGG1-dependent base excision repair [#17, #39, #40, #41, #42]. Genetic models establish that the helicase activity is dispensable for viability and hematopoiesis whereas the non-helicase N-terminal and C-terminal functions are essential, with C-terminal truncations causing bone marrow failure [#37, #51], and that RECQL4 loss is epistatic to p53 activation during skeletogenesis [#49].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that RECQL4 functions in DNA replication initiation rather than acting solely as a repair helicase, by placing it temporally between pre-RC assembly and origin unwinding.\",\n      \"evidence\": \"Xenopus egg extract immunodepletion/add-back with chromatin fractionation epistasis (xRTS homolog)\",\n      \"pmids\": [\"15960976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the molecular partners mediating origin recruitment\", \"Left open which domain carries the essential initiation activity\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Localized the essential replication-initiation activity to the N-terminal non-helicase domain and identified TopBP1/Cut5 as its physical partner, defining a Sld2-like origin-firing module distinct from the helicase.\",\n      \"evidence\": \"Xenopus extract domain rescue, co-IP with Cut5, polymerase alpha loading assay; later refined by NMR of the first 54 residues binding TopBP1 and branched DNA\",\n      \"pmids\": [\"16782873\", \"22730300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the full set of replicative factors downstream of TopBP1 binding\", \"Structural basis of polymerase alpha loading unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved the long-standing question of whether RECQL4 is a true helicase and tied it mechanistically to the replicative machinery, showing it is required for CMG assembly and MCM10/Ctf4 origin recruitment.\",\n      \"evidence\": \"In vitro helicase assays with purified protein and domain/Walker A mutants; co-IP and ChIP placing RECQL4 in a chromatin complex with MCM2-7/CDC45/GINS/MCM10; BiFC and ChIP at human origins with CDK/DDK inhibition\",\n      \"pmids\": [\"19177149\", \"19696745\", \"19805216\", \"20065033\", \"20451470\", \"19759018\", \"25602958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conflicting early reports on helicase activity reflect substrate/preparation dependence\", \"How CMG assembly is coordinated with helicase catalysis at origins not fully defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended RECQL4 function to repair and telomere maintenance, demonstrating direct partnerships with HR/repair factors and shelterin and biochemical stimulation of repair enzymes.\",\n      \"evidence\": \"Co-IP and colocalization with RAD51, XPA, APE1/pol beta/FEN1; in vitro D-loop unwinding with TRF1/TRF2/POT1 and WRN; telomere FISH and ChIP\",\n      \"pmids\": [\"16141230\", \"18693251\", \"19567405\", \"22039056\", \"22544709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of each repair pathway in vivo not quantified\", \"Whether helicase catalysis vs. scaffolding drives each interaction unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a mitochondrial role for RECQL4, including a p53-shuttling function and modulation of polymerase gamma, expanding its genome-maintenance activity beyond the nucleus.\",\n      \"evidence\": \"Mitochondrial fractionation/microscopy, mtDNA damage and replication assays, mitochondrial localization-signal mapping, and in vitro Pol gamma binding/activity assays in patient and complemented cells\",\n      \"pmids\": [\"22296597\", \"22357944\", \"24067899\", \"22824301\", \"24746816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nuclear vs. mitochondrial pools are balanced under physiological conditions not fully resolved\", \"Direct enzymatic role of RECQL4 in mtDNA replication versus accessory stimulation of Pol gamma not separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected RECQL4 helicase and C-terminal domains to replication-stress responses and provided the biochemical basis for disease alleles by characterizing the RAPADILINO mutant.\",\n      \"evidence\": \"Isogenic RECQL4 delta-C cells with IR-specific fork stalling and DNA fiber assays; in vitro characterization of the RAPADILINO exon-7 deletion mutant\",\n      \"pmids\": [\"22508716\", \"22885111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The IR-specific fork-protection mechanism is not molecularly defined\", \"Genotype-phenotype mapping across RECQL4 syndromes incomplete\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped the biochemical and structural logic of the N-terminus, showing intrinsically disordered DNA-binding modules confer strand annealing and exceptional G4 affinity.\",\n      \"evidence\": \"Purified N-terminal fragments in annealing/strand-exchange and quantitative binding assays; Holliday-junction binding mapping; NMR of a Zn-knuckle domain\",\n      \"pmids\": [\"25336622\", \"25769792\", \"26888063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular substrates of the G4/branched-DNA binding activities not established\", \"How these binding modes integrate with helicase catalysis unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated that RECQL4 actively promotes DSB end resection in HR by recruiting CtIP to the MRN complex, separating its catalytic and scaffolding contributions.\",\n      \"evidence\": \"Co-IP with MRN and CtIP, laser-DSB imaging, HR reporter and resection assays, helicase-inactive mutant\",\n      \"pmids\": [\"27320928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of MRN/CtIP/RECQL4 assembly during resection not fully resolved\", \"Single-lab finding without independent reconstitution\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided high-resolution structural insight into the RECQL4 catalytic core and C-terminal architecture, revealing a non-canonical RQC and a mechanism more akin to bacterial RecQ.\",\n      \"evidence\": \"X-ray crystallography of the ATPase core plus C-terminal domain, SAXS, ICP-AES zinc detection, and active-site mutagenesis with in vitro helicase assays\",\n      \"pmids\": [\"28653661\", \"27998982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length structure including the disordered N-terminus\", \"Structural basis of substrate selectivity in cells unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetically dissected which RECQL4 activities are essential in vivo, establishing that helicase catalysis is dispensable whereas non-helicase C-terminal functions are required for survival and hematopoiesis.\",\n      \"evidence\": \"CRISPR knock-in mice (K525A helicase-dead vs. truncating alleles), DT40 domain-rescue, and conditional hematopoietic knockout with helicase-inactive complementation\",\n      \"pmids\": [\"31276497\", \"24960165\", \"21256165\", \"31519754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The essential C-terminal molecular activity remains undefined\", \"Why helicase-dead protein suffices in some tissues but not after exogenous damage unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Uncovered a replication- and repair-independent mitotic function, identifying RECQL4 as a spindle microtubule-associated protein required for chromosome alignment.\",\n      \"evidence\": \"Spindle immunofluorescence, Xenopus extract and HeLa depletion, kinetochore-distance measurement, patient fibroblasts, live-cell imaging\",\n      \"pmids\": [\"30718377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Microtubule-binding interface not mapped\", \"Mechanistic link between RECQL4 and kinetochore tension unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a post-translational regulatory network controlling RECQL4 localization, stability, and DSB dynamics through acetylation, phosphorylation, and ubiquitination.\",\n      \"evidence\": \"p300 acetylation and SIRT1 deacetylation assays with localization/OGG1 readouts; RNF8 and UBE2O ubiquitination plus USP7 deubiquitination with HR reporters; DNA-PKcs phosphorylation with NHEJ assays\",\n      \"pmids\": [\"19299466\", \"32432680\", \"33674555\", \"34921745\", \"35580045\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Crosstalk and hierarchy among the modifications not integrated\", \"Several modification-pathway findings rest on single-lab co-IP and reporter data\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular identity of the essential helicase-independent C-terminal function — required for viability and hematopoiesis yet biochemically uncharacterized — remains the central open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No defined biochemical activity or essential partner attributed to the C-terminal essential function\", \"Unclear how the spindle, mitochondrial, and replication roles are partitioned in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [4, 7, 8, 9]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [29, 30, 31, 46]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [4, 8, 33, 34]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3, 4, 8]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [36]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 22, 23, 39]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [19, 20, 27]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0005819\", \"supporting_discovery_ids\": [36]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [1, 2, 5, 6, 10, 32]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12, 13, 24, 25, 39, 42]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [36]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [19, 20, 23]}\n    ],\n    \"complexes\": [\n      \"CMG (Cdc45-MCM2-7-GINS) replication helicase\",\n      \"MRN (MRE11-RAD50-NBS1) complex\",\n      \"Ku70/Ku80-DNA-PKcs (NHEJ)\",\n      \"shelterin (TRF1/TRF2/POT1)\"\n    ],\n    \"partners\": [\n      \"TOPBP1\",\n      \"MCM10\",\n      \"CTIP\",\n      \"KU70\",\n      \"DNA-PKcs\",\n      \"TRF2\",\n      \"OGG1\",\n      \"POLG\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}