{"gene":"RAD51","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2010,"finding":"Purified full-length human BRCA2 promotes assembly of RAD51 onto single-stranded DNA (ssDNA) by targeting RAD51 to ssDNA over double-stranded DNA, enabling RAD51 to displace RPA from ssDNA, and stabilizing RAD51-ssDNA filaments by blocking ATP hydrolysis. BRCA2 does not mediate ssDNA annealing.","method":"Biochemical reconstitution with purified full-length BRCA2 and RAD51; strand-exchange assays, RPA displacement assays, ATP hydrolysis measurements","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified full-length proteins, multiple orthogonal biochemical assays in a landmark single study","pmids":["20729832"],"is_preprint":false},{"year":1998,"finding":"Yeast Rad52 protein stimulates DNA strand exchange by Rad51 by targeting Rad51 to RPA-coated ssDNA, overcoming the inhibitory effect of RPA on presynaptic filament formation; stimulation requires concerted action of Rad51, Rad52, and RPA via specific protein-protein interactions.","method":"In vitro DNA strand exchange assays with purified yeast Rad51, Rad52, and RPA; protein interaction studies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, replicated across two papers (PMID:9450760 and PMID:9450758)","pmids":["9450760","9450758"],"is_preprint":false},{"year":1998,"finding":"Yeast Rad54 protein physically interacts with Rad51 and strongly stimulates the rate of homologous DNA pairing between ssDNA and dsDNA catalyzed by Rad51; Rad54 possesses a dsDNA-dependent ATPase activity.","method":"Purification of Rad54 to near homogeneity; in vitro homologous pairing assays; ATPase assays; protein interaction studies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified proteins, multiple orthogonal assays","pmids":["9590697"],"is_preprint":false},{"year":1997,"finding":"Purified human RAD51 (HsRad51) catalyzes ATP-dependent homologous pairing and DNA strand exchange in vitro; rates of ATP hydrolysis, homologous pairing, and strand exchange by HsRad51 are less than 1/10 those of RecA. In the presence of ATP-γS, HsRad51 forms stable presynaptic complexes and promotes renaturation but does not catalyze strand exchange or homologous pairing with duplex DNA, suggesting that homologous pairing and strand exchange by HsRad51 are more closely linked to ATP hydrolysis than in RecA.","method":"In vitro biochemical assays with purified HsRad51; ATPase assays, homologous pairing, strand exchange assays with ATP and ATP-γS","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzymatic characterization with purified protein and multiple assay conditions","pmids":["9012806"],"is_preprint":false},{"year":1998,"finding":"Human Rad52 stimulates homologous pairing by human Rad51; hRad52 binds ssDNA and is involved in an early stage of Rad51-mediated recombination.","method":"In vitro homologous pairing assays with purified hRad51 and hRad52","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified human proteins, consistent with parallel yeast work","pmids":["9450758"],"is_preprint":false},{"year":2005,"finding":"BRCA2 BRC repeats (BRC3 and BRC4) bind RAD51-DNA nucleoprotein filaments at lower molar ratios and only disrupt filaments at high concentrations. BRC3 contacts the N-terminal domain of RAD51 and BRC4 contacts the nucleotide-binding core, showing that BRC repeats are non-equivalent in their mode of interaction with RAD51 filaments.","method":"Cryo-EM structural analysis of RAD51-DNA filaments with BRC peptides; biochemical binding assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structural analysis combined with functional binding data, single study","pmids":["15937124"],"is_preprint":false},{"year":2000,"finding":"Human Rad51 redistributes to selectively UV-damaged, halogenated-thymidine-labeled chromatin after UV microirradiation, with recruitment occurring from pre-existing S-phase nuclear foci. Rad51 foci associate preferentially with postreplicative rather than replicating chromatin, supporting a role in recombinational repair of damage in postreplicative chromatin.","method":"UV microirradiation of small nuclear areas combined with halogenated thymidine labeling and immunofluorescence; confocal microscopy","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with functional implication, single lab, two complementary labeling approaches","pmids":["10908572"],"is_preprint":false},{"year":2004,"finding":"RAD51 is required for more than 95% of break-induced replication (BIR) events at unique chromosomal sequences in yeast, demonstrating a genetic requirement for RAD51 in strand invasion during BIR.","method":"Chromosome fragmentation assay in S. cerevisiae; genetic epistasis analysis using rad51 deletion mutants","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in yeast with quantitative BIR assay, single lab","pmids":["14993274"],"is_preprint":false},{"year":2000,"finding":"Human RAD51 paralogs (XRCC2, XRCC3, RAD51B, RAD51C, RAD51D) form simultaneous protein interactions with each other and with HsRAD51; three-hybrid and baculovirus co-purification experiments show that some interactions (e.g., RAD51B-RAD51D) require a third paralog (RAD51C) to occur, suggesting they may form multi-protein complexes.","method":"Yeast two-hybrid, yeast three-hybrid, and baculovirus co-purification with 6xHis-tagged proteins","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction mapping with two orthogonal systems (yeast two/three-hybrid and baculovirus pulldown), single lab","pmids":["10749867"],"is_preprint":false},{"year":1999,"finding":"The C-terminal region of HsRad51 contains amino acid residues required for binding to HsRad52; mutations in this region (not the N-terminal domain) impair HsRad52 binding. The HsRad51 F259V mutation, which abrogates HsRad52 binding, reduces the stimulation of homologous pairing that occurs with both proteins together without affecting HsRad51-only pairing, establishing that the HsRad51-HsRad52 interaction is important for cooperative homologous pairing.","method":"Yeast two-hybrid analysis; random mutagenesis; in vitro homologous pairing assays with purified mutant and wild-type proteins","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay with defined mutants, single lab with multiple approaches","pmids":["10448035"],"is_preprint":false},{"year":2007,"finding":"Efficient turnover of Rad51 from dsDNA after strand exchange requires both the Rad51 ATPase activity and the Rad54 ATPase activity; the catalytic efficiency of Rad54's ATPase is stimulated by Rad51 partial filaments on dsDNA. The Rad51-K191R ATPase-dead mutant forms filaments with significantly increased stability on DNA.","method":"Kinetic ATPase assays; electron microscopy of nucleoprotein filaments; experiments with wild-type Rad51, Rad51-K191R mutant, and Rad54 proteins","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with ATPase-dead mutants and EM, single lab","pmids":["17567608"],"is_preprint":false},{"year":2008,"finding":"Rad51 inhibits Rad52-mediated annealing of complementary ssDNA in an ATP-dependent manner through specific protein-protein interaction; the Rad51 nucleoprotein filament is more inhibitory than free Rad51. Rad59 partially restores Rad52 annealing in the presence of Rad51, suggesting coordinated channeling of processed DSBs to either strand invasion or annealing pathways.","method":"In vitro ssDNA annealing assays with purified yeast Rad51, Rad52, Rad59, and RPA; protein interaction studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution assays with purified proteins, single lab, multiple conditions tested","pmids":["18337252"],"is_preprint":false},{"year":2008,"finding":"Human Rad51 specifically stimulates the branch migration activity of human Rad54 through protein-protein interactions; the active conformation of the hRad51 filament is more stimulatory than the inactive form. This stimulation is evolutionarily conserved (also observed with yeast proteins).","method":"In vitro branch migration assays with purified hRad51, hRad54, yeast Rad51, and Rad54; protein interaction assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution, single lab, tested in two species","pmids":["18617519"],"is_preprint":false},{"year":2009,"finding":"Human PSF directly interacts with RAD51 through its N-terminal region and modulates RAD51-mediated homologous pairing and strand exchange in a concentration-dependent biphasic manner: stimulating at low RAD51 concentrations and inhibiting at optimal RAD51 concentrations.","method":"Co-immunoprecipitation; in vitro homologous pairing and strand exchange assays with purified PSF and RAD51; deletion analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct binding and in vitro reconstitution assays, single lab","pmids":["19447914"],"is_preprint":false},{"year":2015,"finding":"The C. elegans RAD51 paralog complex RFS-1/RIP-1 binds pre-synaptic RAD51 filaments and remodels them to a stabilized, 'open,' and flexible conformation in which ssDNA is more accessible and RAD51 dissociation rate is reduced. Walker box mutations in RFS-1 that abolish filament remodeling also abolish stimulation of RAD51 strand exchange, demonstrating that remodeling activity is essential for function.","method":"Biochemical filament remodeling assays; single-molecule imaging; electron microscopy; mutagenesis of Walker box motifs","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution, single-molecule imaging, EM, and structure-function mutagenesis in one study","pmids":["26186187"],"is_preprint":false},{"year":2016,"finding":"TOPBP1 promotes PLK1 kinase-mediated phosphorylation of RAD51 at serine 14, which is required for RAD51 recruitment to chromatin (chromatin loading and foci formation) during homologous recombination repair; TOPBP1 BRCT domains 7/8 are essential for RAD51 foci formation.","method":"siRNA screen; co-immunoprecipitation; chromatin fractionation; RAD51 foci assays; phosphorylation mapping","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical and cell biological approaches, single lab, multiple orthogonal methods","pmids":["26811421"],"is_preprint":false},{"year":2018,"finding":"RADX antagonizes RAD51 by competing with RAD51 for binding to ssDNA, modulating the amount of RAD51 at stalled replication forks. Loss of RADX restores fork protection in BRCA1-, BRCA2-, FANCA-, FANCD2-, or BOD1L-deficient cells; overexpression of RADX causes fork degradation dependent on MRE11 and DNA2 nucleases and fork reversal.","method":"siRNA knockdown, RADX overexpression, DNA fiber assays, epistasis analysis in multiple HR-deficient backgrounds","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis across multiple deficient backgrounds, single lab, complementary cell biological approaches","pmids":["30021152"],"is_preprint":false},{"year":2021,"finding":"RADX directly and selectively interacts with ATP-bound RAD51, stimulates RAD51 ATP hydrolysis, and destabilizes RAD51 nucleofilaments, thereby inhibiting RAD51 strand exchange and D-loop formation. BRCA2 can overcome RADX-dependent RAD51 inhibition, placing RADX in functional opposition to BRCA2 in regulating RAD51 nucleofilament stability during DNA replication.","method":"In vitro strand exchange and D-loop assays with purified proteins; direct binding assays with ATP-bound RAD51; ATPase stimulation assays; single-molecule imaging; DNA fiber assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, single-molecule imaging, ATPase assays, and cellular epistasis in one study","pmids":["33453169"],"is_preprint":false},{"year":2020,"finding":"RADX condenses ssDNA filaments (including RPA-coated ssDNA) via higher-order assemblies, blocks RPA displacement by RAD51, and prevents RAD51 loading onto ssDNA, functioning as a negative regulator of RAD51 filament formation.","method":"Single-molecule imaging of purified proteins on ssDNA curtains; in vitro RAD51 loading assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct single-molecule visualization of mechanism with purified proteins, single lab","pmids":["32621611"],"is_preprint":false},{"year":2023,"finding":"RAD51 uses its strand exchange activity to bypass the CMG replicative helicase (which remains bound to a stalled fork) during replication fork reversal. If the helicase is unloaded, RAD51 is no longer required for fork reversal. Thus RAD51 creates a parental DNA duplex behind the helicase that DNA translocases use for branch migration to generate the reversed fork structure.","method":"Auxin-inducible degron (AID) system to deplete CMG components; DNA fiber assays; epistasis analysis in human cells","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with conditional depletion, single lab, mechanistic model supported by multiple genetic conditions","pmids":["37104614"],"is_preprint":false},{"year":2017,"finding":"RAD51 deficiency leads to accumulation of self-DNA in the cytoplasm, triggering a STING-mediated innate immune response; the unprotected nascent genome in RAD51-deficient cells is degraded by MRE11 exonuclease, and the resulting fragmented nascent DNA accumulates in the cytosol to initiate innate immune signaling.","method":"RAD51 siRNA knockdown; cytosolic DNA detection; STING pathway activation assays; epistasis with MRE11 inhibition","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with cytosolic DNA detection and epistasis, single lab","pmids":["28334891"],"is_preprint":false},{"year":2016,"finding":"FANCI-FANCD2 (I-D) complex directly binds RAD51 and stabilizes the RAD51-DNA filament in a manner requiring the DNA-binding activity of FANCI; the stabilized filament protects the 5'-DNA end from FAN1 nucleolytic degradation. The RAD51 mutant from FANCR patient cells fails to achieve this protection.","method":"Co-immunoprecipitation; in vitro RAD51 filament stability assays with purified I-D complex; nuclease protection assays; patient-derived RAD51 mutant analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins and disease-relevant mutation, single lab","pmids":["27694619"],"is_preprint":false},{"year":2014,"finding":"HOP2-MND1 heterodimer stimulates RAD51 DNA strand exchange by inducing conformational changes in RAD51 that enhance interaction with nucleotide cofactors, modify DNA-binding specificity, facilitate RAD51 loading onto ssDNA, and promote dsDNA binding during the homology search; HOP2-MND1 enables strand exchange in the absence of divalent metal ions and offsets the K133A ATP-binding mutation.","method":"In vitro strand exchange assays; nucleotide binding assays; DNA binding specificity assays with purified RAD51 and HOP2-MND1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple assays and defined mutants, single lab","pmids":["24943459"],"is_preprint":false},{"year":2012,"finding":"The conserved aspartate at the inter-subunit ATP cap (Asp-316 in human RAD51) forms a salt bridge with the ATP γ-phosphate in the nucleoprotein filament, enhancing filament turnover at the expense of recombinase activity; substitution of Asp-316 with lysine (HsRAD51-D316K) decreases NPF turnover and markedly improves strand exchange activity in the absence of salt.","method":"Biochemical nucleoprotein filament assays; strand exchange assays; electron microscopy of archaebacterial RadA and human RAD51 D316K mutant filaments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution, structural analysis (EM), and mutagenesis with functional validation in one study","pmids":["22275364"],"is_preprint":false},{"year":2011,"finding":"Yeast Rad51 is phosphorylated on Ser192 in a DNA-damage-responsive manner primarily mediated by the Mec1 kinase; Ser192 Ala and Glu mutations confer hypersensitivity to DNA damage and homologous recombination defects. Ser192 is required for Rad51 ATPase activity and DNA-binding activity in vitro but not for multimer formation.","method":"In vivo phosphorylation mapping; in vitro ATPase and DNA-binding assays with Ser192 mutants; DNA damage sensitivity assays","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical characterization of mutants combined with in vivo epistasis, single lab","pmids":["21738226"],"is_preprint":false},{"year":2013,"finding":"The HsRAD51B-HsRAD51C heterodimer forms a stable complex on ssDNA and partially stabilizes HsRAD51 nucleoprotein filaments against BLM helicase anti-recombinogenic activity; HsRAD51B-HsRAD51C also stimulates HsRAD51-mediated D-loop formation in the presence of RPA but does not facilitate RAD51 nucleation on RPA-coated ssDNA.","method":"In vitro filament stability assays; D-loop assays with purified HsRAD51, HsRAD51B-HsRAD51C, RPA, and BLM","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins, single lab, multiple assay types","pmids":["23810717"],"is_preprint":false},{"year":2022,"finding":"TOPORS acts as a SUMO E3 ligase that SUMOylates RAD51 at lysine residues 57 and 70 in response to DNA damage; TOPORS SUMOylation is facilitated by ATM-induced phosphorylation of TOPORS at Thr515. SUMOylation of RAD51 is required for its chromatin recruitment and homologous recombination repair; SUMOylation-deficient RAD51 has reduced association with BRCA2.","method":"Mass spectrometry identification of SUMOylation sites; TOPORS knockdown; mutant (K57R/K70R) RAD51 expression; chromatin fractionation; RAD51 foci assays; Co-IP of RAD51 with BRCA2","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple complementary approaches, single lab, defined modification sites with functional validation","pmids":["35061896"],"is_preprint":false},{"year":2021,"finding":"RAD51 protects under-replicated DNA in mitotic cells and promotes mitotic DNA synthesis (MiDAS) and successful chromosome segregation; MiDAS requires de novo RAD51 recruitment to ssDNA supported by Polo-like kinase 1 (PLK1)-mediated phosphorylation of RAD51. Acute inhibition of MiDAS delays anaphase onset and induces centromere fragility.","method":"Acute RAD51 inhibition; EdU incorporation assays for MiDAS; PLK1 inhibition; live-cell imaging; centromere fragility quantification","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays, single lab, defined kinase-substrate relationship","pmids":["34508092"],"is_preprint":false},{"year":2023,"finding":"BRCA2's C-terminal TR2 motif binds across the protomer interface in the RAD51 nucleoprotein filament, acting as a brace for adjacent RAD51 molecules by targeting an acidic-patch motif on RAD51; structure-guided mutagenesis validated the functional importance of this interaction for filament stabilization.","method":"Cryo-electron microscopy of RAD51-TR2 complexes; structure-guided mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with structure-guided mutagenesis and functional validation in one study","pmids":["37919288"],"is_preprint":false},{"year":2023,"finding":"BRCA2 accelerates nucleation of RAD51 onto RPA-coated ssDNA to a rate approaching RAD51 association with naked ssDNA, eliminating the rate-limiting nucleation step by chaperoning a short preassembled RAD51 filament onto the ssDNA; a RAD51 dimer is the minimal unit required for spontaneous nucleation but growth self-terminates below the diffraction limit in the absence of BRCA2.","method":"Single-molecule microfluidics, microscopy, and micromanipulation with full-length BRCA2 and RAD51 on individual DNA molecules mimicking resected lesions","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — single-molecule reconstitution with full-length proteins, quantitative kinetic analysis, single lab with rigorous controls","pmids":["36976771"],"is_preprint":false},{"year":2024,"finding":"RAD51 nucleofilaments specifically recognize and protect abasic sites in ssDNA; abasic sites increase the RAD51 association rate to DNA. In the absence of BRCA2 or RAD51, abasic sites accumulate and induce abasic ssDNA gaps that make replicating DNA fibers sensitive to APE1. RAD51 assembled on abasic DNA prevents cleavage by the MRE11-RAD50 complex, suppressing replication fork breakage.","method":"Cryo-EM structure of RAD51 on abasic-site-containing DNA; Xenopus egg extract experiments; human cell experiments; DNA fiber assays; nuclease protection assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure, Xenopus extract reconstitution, and human cell validation in one study","pmids":["39178838"],"is_preprint":false},{"year":2021,"finding":"RAD51 physically interacts with TERRA lncRNA and catalyzes R-loop formation with TERRA in vitro, directly promoting TERRA recruitment to telomeres by strand invasion in trans; this process is counteracted by RNaseH1 and TRF1.","method":"In vitro R-loop formation assay with purified RAD51 and TERRA; reporter system for TERRA-telomere association; RNaseH1/TRF1 counteraction assays","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution of R-loop formation, single lab, supported by cellular reporter assays","pmids":["33057192"],"is_preprint":false},{"year":2021,"finding":"RAD51 helicase HELQ is strongly stimulated by RAD51 during DNA unwinding via direct complex formation; conversely, RPA inhibits HELQ DNA unwinding but stimulates its DNA strand annealing activity.","method":"Biochemical helicase and annealing assays with purified HELQ, RAD51, and RPA; single-molecule imaging; Co-IP","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution and single-molecule imaging, single lab","pmids":["34937945"],"is_preprint":false},{"year":2021,"finding":"FANCD2, independent of FANCI dimerization, stabilizes RAD51 filaments to inhibit DNA2, MRE11, and EXO1 nucleases at stalled replication forks; additionally, FANCD2 acts as a RAD51 mediator to stimulate RAD51 strand exchange activity, providing a mechanistic link between FANCD2 and BRCA2 in the FA/BRCA fork protection pathway.","method":"In vitro nuclease protection assays and strand exchange assays with purified FANCD2, RAD51, DNA2, MRE11, EXO1; RAD51 filament stability assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple purified nucleases, single lab","pmids":["37526271"],"is_preprint":false},{"year":1998,"finding":"HsRad51 is proteolytically cleaved during apoptosis in human T-lymphocyte cell lines with similar kinetics to PARP cleavage; cleavage is blocked by the caspase inhibitor Ac-DEVD-CHO, implicating a DEVD-specific caspase, though purified caspases 2, 3, or 6-10 could not individually cleave HsRad51 in vitro.","method":"Immunoblotting of apoptotic cell lysates; cell-free apoptosis system with IVT-HsRad51; caspase inhibitor experiments","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-free system combined with caspase inhibitor assays, single lab","pmids":["9607320"],"is_preprint":false},{"year":2001,"finding":"Depletion of HsRad51 from human cell-free extracts diminishes triplex-induced recombination, and supplementation with purified HsRad51 restores it, establishing that HsRad51 is required for triplex-induced intermolecular recombination in human cell extracts.","method":"Immunodepletion and reconstitution in human cell-free extracts; supF reporter assay for recombination","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — immunodepletion/reconstitution approach in cell-free system, single lab","pmids":["11278954"],"is_preprint":false},{"year":2022,"finding":"RAD51 Cys319 is a functionally significant redox-regulated site; oxidation of Cys319 disrupts DNA binding (molecular dynamics simulations show DNA dissociation from oxidized Cys319 RAD51 filament). Peroxiredoxin 1 (PRDX1) maintains Cys319 in a reduced state, and loss of PRDX1 leads to increased sulfenylation of RAD51 Cys319, impaired RAD51 foci formation, and decreased homologous recombination.","method":"Cys319 mutagenesis; molecular dynamics simulation; sulfenylation probe (DAz-2) labeling in PRDX1-deficient cells; RAD51 foci assays; HR reporter assays","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with MD simulation and cellular assays, single lab","pmids":["36058112"],"is_preprint":false},{"year":2023,"finding":"Centromeric DNA breaks in quiescent human cells are resolved enzymatically by RAD51 recombinase, which safeguards the specification of functional centromeres.","method":"Single-cell imaging strategy for DNA breaks at repetitive centromeric regions; RAD51 inhibition in quiescent cells; centromere integrity assays","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct imaging with RAD51 inhibition demonstrating functional requirement, single lab","pmids":["36702125"],"is_preprint":false},{"year":2021,"finding":"RAD51 protects replication forks from transcription-replication conflicts (TRCs); RAD51-deficient regions enriched for early-S-phase replication and transcription show increased fork breakage, and inhibiting early S-phase transcription ameliorates many adverse effects of RAD51 depletion.","method":"RAD51 depletion; DNA fiber assays; transcription inhibition epistasis; genomic mapping of affected loci","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis between RAD51 and transcription, single lab, with genomic mapping","pmids":["36002000"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of human RAD51-DNA complexes reveal that Loop2 residues V273 and D274 in RAD51 (vs. P274 and G275 in DMC1) are key determinants of mismatch intolerance during strand exchange; these differences in Loop2 that contact both ssDNA and the complementary strand explain why RAD51 does not permit HR in the presence of mismatches whereas DMC1 does.","method":"Cryo-EM structures of Rad51-DNA and Dmc1-DNA complexes; molecular dynamics simulation; single-molecule FRET assays; site-directed mutagenesis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure, MD simulation, smFRET, and mutagenesis in one study","pmids":["34871438"],"is_preprint":false},{"year":2023,"finding":"In vivo, Rad51-ssDNA nucleoprotein filaments in budding yeast span the entire nucleus following DSB induction, adopting diverse shapes not seen in vitro; the filaments undergo cycles of compaction and extension modulated by Rad54 (promotes extension) and Srs2 (promotes compaction), and this compaction-extension dynamic constitutes a robust nuclear homology search strategy.","method":"Functional fluorescently tagged Rad51 expressed from endogenous locus; live-cell single-molecule imaging; DSB induction; genetic analysis with rad54 and srs2 mutants; biophysical modeling","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — first functional tag enabling in vivo single-molecule tracking, combined with genetic mutants and biophysical modeling","pmids":["37605042"],"is_preprint":false},{"year":2020,"finding":"Rad51 facilitates Dmc1 nucleoprotein filament assembly during meiosis through direct physical interaction; Dmc1 nucleation is stimulated by short Rad51 patches on DNA, and pull-down assays confirm a physical interaction between ScDmc1 and ScRad51 but not between ScDmc1 and EcRecA.","method":"Single-molecule tethered particle motion assays for filament assembly kinetics; in vitro biochemical filament assays; pull-down experiments with purified proteins","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — single-molecule and biochemical reconstitution, single lab","pmids":["32404423"],"is_preprint":false},{"year":2018,"finding":"Rad51 and Dmc1 have an intrinsic ability to self-segregate within mixed presynaptic filaments in vitro, without any accessory proteins; Dmc1 stabilizes adjacent Rad51 filament segments, suggesting cross-talk between the two recombinases.","method":"Single-molecule imaging of Rad51 and Dmc1 presynaptic complex assembly on ssDNA curtains","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — single-molecule visualization with purified proteins, single lab","pmids":["29382724"],"is_preprint":false},{"year":2017,"finding":"Human RAD52 binds tightly to RPA-ssDNA and imposes an inhibitory effect on RPA turnover; during RAD51 presynaptic complex assembly, most RPA and RAD52 are displaced but some RAD52-RPA-ssDNA clusters persist interspersed within RAD51 filaments; once RAD51 filament assembles, it restricts new RAD52 binding events but RAD52 re-binds after RAD51 dissociation.","method":"Single-molecule imaging on ssDNA curtains with purified human RAD52, RPA, and RAD51","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — single-molecule visualization with purified human proteins, single lab","pmids":["28551686"],"is_preprint":false},{"year":1998,"finding":"BRCA2 gene product forms in vivo complexes with both RAD51 and p53 in human cells; BRCA2 is a nuclear phosphoprotein, and exogenous BRCA2 expression inhibits p53's transcriptional activity with RAD51 coexpression enhancing this inhibitory effect.","method":"Co-immunoprecipitation from cell lysates; transient transfection; p53 transcriptional reporter assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP combined with functional transcription assay, single lab","pmids":["9811893"],"is_preprint":false}],"current_model":"RAD51 is a RecA-family ATPase recombinase that assembles as a nucleoprotein filament on ssDNA at resected DNA double-strand breaks and stalled replication forks; the filament performs homology search and ATP-hydrolysis-coupled strand exchange with homologous duplex DNA, activities controlled by a network of regulators including BRCA2 (which nucleates and stabilizes the filament on RPA-coated ssDNA by chaperoning preassembled RAD51 dimers), Rad52/RAD52 (which recruits RAD51 to RPA-ssDNA and coordinates with strand annealing), Rad54 (which stimulates pairing via dsDNA-dependent ATPase and facilitates filament turnover from dsDNA), RAD51 paralogs (which remodel and stabilize pre-synaptic filaments), RADX (which antagonizes filament formation by competing for ssDNA and stimulating RAD51 ATPase), and post-translational modifications including Mec1/PLK1-dependent phosphorylation and TOPORS-dependent SUMOylation that control chromatin loading; beyond DSB repair, RAD51 uses its strand exchange activity to catalyze replication fork reversal while bypassing the stalled CMG helicase, protects nascent DNA strands and abasic sites from nucleolytic degradation, suppresses transcription-replication conflicts, promotes mitotic DNA synthesis, and in the absence of RAD51 unprotected nascent DNA is degraded by MRE11, generating cytosolic DNA fragments that activate STING-mediated innate immune signaling."},"narrative":{"mechanistic_narrative":"RAD51 is the central eukaryotic recombinase that assembles as an ATP-dependent nucleoprotein filament on single-stranded DNA and catalyzes homology search and DNA strand exchange, the core reaction of homologous recombination [PMID:9012806]. Filament assembly on RPA-coated ssDNA is rate-limited by nucleation, which BRCA2 overcomes by chaperoning a preassembled RAD51 nucleus onto ssDNA, displacing RPA and stabilizing the filament against ATP hydrolysis [PMID:20729832, PMID:36976771]; a C-terminal BRCA2 TR2 motif braces adjacent protomers across the filament interface, while the BRC repeats engage distinct RAD51 surfaces [PMID:37919288, PMID:15937124]. The filament's recombinase activity is intrinsically coupled to ATP hydrolysis and to an inter-subunit ATP cap that tunes turnover versus strand-exchange efficiency [PMID:9012806, PMID:22275364], and Loop2 residues impose strict mismatch intolerance that distinguishes RAD51 from its meiotic counterpart DMC1 [PMID:34871438]. A broad network of mediators governs the filament: RAD52 targets RAD51 to RPA-ssDNA and channels lesions between strand invasion and annealing [PMID:9450760, PMID:9450758, PMID:18337252], Rad54 stimulates homologous pairing and branch migration and drives ATPase-dependent filament turnover from duplex DNA [PMID:9590697, PMID:17567608, PMID:18617519], the RAD51 paralogs assemble into complexes that remodel and stabilize presynaptic filaments [PMID:10749867, PMID:26186187, PMID:23810717], and HOP2-MND1 and FANCD2/FANCI further stimulate or stabilize the filament [PMID:24943459, PMID:27694619, PMID:37526271]. Filament abundance at replication forks is set antagonistically by RADX, which competes for ssDNA, stimulates RAD51 ATPase, and destabilizes filaments in opposition to BRCA2 [PMID:30021152, PMID:33453169, PMID:32621611]. Chromatin loading is controlled by post-translational modification, including TOPBP1/PLK1-dependent Ser14 phosphorylation, Mec1-dependent phosphorylation of the yeast enzyme, and TOPORS-dependent SUMOylation [PMID:26811421, PMID:21738226, PMID:35061896]. Beyond canonical double-strand break repair and break-induced replication [PMID:14993274], RAD51 protects stalled and nascent replication forks—catalyzing fork reversal while bypassing the bound CMG helicase, shielding abasic sites and nascent strands from MRE11/DNA2/EXO1 nucleases, and suppressing transcription-replication conflicts [PMID:37104614, PMID:39178838, PMID:37526271, PMID:36002000]; in its absence, MRE11-driven degradation of unprotected nascent DNA releases cytosolic fragments that activate STING-mediated innate immunity [PMID:28334891]. RAD51 also promotes mitotic DNA synthesis and centromere integrity [PMID:34508092, PMID:36702125] and forms TERRA R-loops at telomeres [PMID:33057192].","teleology":[{"year":1997,"claim":"Establishing that purified human RAD51 is itself a recombinase defined the protein's core catalytic activity and its mechanistic relationship to bacterial RecA.","evidence":"In vitro ATPase, homologous pairing, and strand exchange assays with purified HsRad51 under ATP and ATP-γS","pmids":["9012806"],"confidence":"High","gaps":["Did not address how the slow human enzyme is regulated in cells","No structure of the active filament","Mediators required for activity on RPA-coated ssDNA not identified"]},{"year":1998,"claim":"Identifying Rad52 and Rad54 as direct RAD51 stimulators showed the recombinase does not act alone but requires mediators to load onto RPA-ssDNA and to complete pairing.","evidence":"In vitro strand exchange, homologous pairing, and ATPase assays with purified yeast and human Rad51, Rad52, Rad54, and RPA","pmids":["9450760","9450758","9590697","9012806"],"confidence":"High","gaps":["Did not define the in vivo order of mediator action","Structural basis of Rad51-Rad52 and Rad51-Rad54 contacts unresolved","Did not explain how channeling between invasion and annealing is decided"]},{"year":1999,"claim":"Mapping the RAD51 C-terminal residues required for RAD52 binding linked a specific protein-protein interaction to cooperative homologous pairing.","evidence":"Yeast two-hybrid, random mutagenesis, and in vitro pairing assays with the F259V mutant","pmids":["10448035"],"confidence":"Medium","gaps":["Single interface mapped without structure","Did not test consequences in cells","Other RAD52 contacts not excluded"]},{"year":2000,"claim":"Live-cell relocalization to damaged postreplicative chromatin connected RAD51 biochemistry to a cellular site of action in S-phase repair.","evidence":"UV microirradiation with halogenated thymidine labeling and immunofluorescence","pmids":["10908572"],"confidence":"Medium","gaps":["Correlative localization, not direct demonstration of repair","Recruitment factors not identified","Single lab"]},{"year":2004,"claim":"Genetic requirement for RAD51 in break-induced replication extended its role beyond gene conversion to replication-associated repair.","evidence":"Chromosome fragmentation assay and rad51 epistasis in S. cerevisiae","pmids":["14993274"],"confidence":"Medium","gaps":["Yeast genetics, not direct biochemical mechanism","Did not define the replication machinery coupling","Human relevance not tested here"]},{"year":2008,"claim":"Defining how RAD51 inhibits RAD52 annealing and stimulates Rad54 branch migration showed the filament actively partitions DSBs between recombination subpathways.","evidence":"In vitro annealing and branch migration assays with purified Rad51, Rad52, Rad59, Rad54, and conformation comparisons","pmids":["18337252","18617519"],"confidence":"High","gaps":["In vitro only","In vivo pathway-choice control not established","Role of additional regulators in channeling not addressed"]},{"year":2015,"claim":"Demonstrating that the RAD51 paralog complex remodels presynaptic filaments to a stabilized open conformation defined a mechanistic role for paralogs distinct from BRCA2-mediated nucleation.","evidence":"Filament remodeling, single-molecule imaging, EM, and Walker-box mutagenesis of C. elegans RFS-1/RIP-1","pmids":["26186187","10749867","23810717"],"confidence":"High","gaps":["Human paralog complex stoichiometry not fully resolved","Structural basis of remodeling unknown","Coordination with BRCA2 in vivo not defined"]},{"year":2016,"claim":"Identifying TOPBP1/PLK1-dependent Ser14 phosphorylation and TOPORS-dependent SUMOylation established post-translational control of RAD51 chromatin loading.","evidence":"siRNA screens, phosphorylation/SUMO site mapping, chromatin fractionation, and foci assays","pmids":["26811421","35061896","21738226"],"confidence":"Medium","gaps":["How modifications mechanistically alter filament assembly not fully resolved","Crosstalk between phosphorylation and SUMOylation untested","Modification dynamics during repair not measured"]},{"year":2017,"claim":"Linking RAD51 loss to MRE11-driven nascent-DNA degradation and cytosolic self-DNA accumulation connected fork protection to STING innate immune signaling.","evidence":"RAD51 knockdown, cytosolic DNA detection, STING activation, and MRE11 epistasis","pmids":["28334891"],"confidence":"Medium","gaps":["Knockdown rather than separation-of-function alleles","Quantitative link between fork protection defect and immune output not established","In vivo relevance not tested"]},{"year":2018,"claim":"Establishing RADX as a ssDNA-competing antagonist that opposes BRCA2 defined how filament abundance at forks is tuned downward.","evidence":"siRNA, RADX overexpression, DNA fiber assays, and epistasis across multiple HR-deficient backgrounds","pmids":["30021152","32621611"],"confidence":"Medium","gaps":["Cellular epistasis preceded full biochemical mechanism","Conditions favoring RADX over BRCA2 unclear","Regulation of RADX itself not addressed"]},{"year":2021,"claim":"Reconstituting RADX with purified RAD51 showed it selectively binds ATP-bound RAD51, stimulates ATP hydrolysis, and destabilizes filaments, placing it in direct functional opposition to BRCA2.","evidence":"In vitro strand exchange, D-loop, ATPase, and single-molecule assays with purified proteins","pmids":["33453169"],"confidence":"High","gaps":["Structural basis of RADX-RAD51 selectivity unknown","Switch between RADX and BRCA2 dominance in vivo not defined","Fork-specific recruitment not resolved"]},{"year":2021,"claim":"Expanding RAD51's roles to mitotic DNA synthesis, transcription-replication conflict suppression, telomeric TERRA R-loop formation, and HELQ stimulation broadened the recombinase into a general genome-protection factor.","evidence":"Acute RAD51/PLK1 inhibition, MiDAS and fiber assays, in vitro R-loop and helicase reconstitution, single-molecule imaging","pmids":["34508092","36002000","33057192","34937945"],"confidence":"Medium","gaps":["Whether these functions use the canonical filament or distinct assemblies is partly unresolved","In vivo contributions of each function not quantitatively partitioned","Mostly single-lab demonstrations"]},{"year":2023,"claim":"Mechanistic resolution of fork reversal and in-cell filament dynamics showed RAD51 strand exchange generates a parental duplex behind the bound CMG helicase and that filaments scan the nucleus via compaction-extension cycles.","evidence":"CMG degron and fiber assays in human cells; in vivo single-molecule tracking of endogenously tagged Rad51 in yeast with rad54/srs2 mutants","pmids":["37104614","37605042"],"confidence":"High","gaps":["Structure of the RAD51-CMG-fork intermediate unknown","How filament shape is read out for homology search not resolved","Human in vivo filament dynamics not directly imaged"]},{"year":2024,"claim":"Structural and functional demonstration that RAD51 recognizes and protects abasic sites refined its fork-protection role to specific lesion types.","evidence":"Cryo-EM of RAD51 on abasic DNA, Xenopus extract and human cell experiments, fiber and nuclease protection assays","pmids":["39178838","37526271"],"confidence":"High","gaps":["How abasic recognition is regulated by mediators unclear","Relationship to ATPase cycle not fully defined","In vivo abundance of abasic-protected filaments unknown"]},{"year":null,"claim":"It remains unresolved how the competing mediator and antagonist network, post-translational modifications, and lesion-specific recognition are integrated to determine RAD51 filament fate at any given genomic site.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of the regulated filament in its cellular context","Quantitative thresholds for BRCA2-versus-RADX dominance unknown","How modification state biases between repair, fork protection, and immune signaling not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,23,39,30]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[3,10,23]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[3,35,31]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[31]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,40]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[6,15,26,27]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,3,7]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[19,30,38]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[27,37]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[20]}],"complexes":["RAD51-ssDNA presynaptic nucleoprotein filament","RAD51 paralog complex (RAD51B-RAD51C)"],"partners":["BRCA2","RAD52","RAD54","RADX","FANCD2","HELQ","RAD51C","DMC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q06609","full_name":"DNA repair protein RAD51 homolog 1","aliases":["RAD51 homolog A"],"length_aa":339,"mass_kda":37.0,"function":"Plays an important role in homologous strand exchange, a key step in DNA repair through homologous recombination (HR) (PubMed:12205100, PubMed:18417535, PubMed:20231364, PubMed:20348101, PubMed:22325354, PubMed:23509288, PubMed:23754376, PubMed:26681308, PubMed:28575658, PubMed:32640219). Binds to single-stranded DNA in an ATP-dependent manner to form nucleoprotein filaments which are essential for the homology search and strand exchange (PubMed:12205100, PubMed:18417535, PubMed:15226506, PubMed:20231364, PubMed:20348101, PubMed:23509288, PubMed:23754376, PubMed:26681308, PubMed:28575658). Catalyzes the recognition of homology and strand exchange between homologous DNA partners to form a joint molecule between a processed DNA break and the repair template (PubMed:12205100, PubMed:18417535, PubMed:20231364, PubMed:20348101, PubMed:23509288, PubMed:23754376, PubMed:26681308, PubMed:28575658, PubMed:38459011). Recruited to resolve stalled replication forks during replication stress (PubMed:27797818, PubMed:31844045). Part of a PALB2-scaffolded HR complex containing BRCA2 and RAD51C and which is thought to play a role in DNA repair by HR (PubMed:12442171, PubMed:24141787). Plays a role in regulating mitochondrial DNA copy number under conditions of oxidative stress in the presence of RAD51C and XRCC3 (PubMed:20413593). Also involved in interstrand cross-link repair (PubMed:26253028)","subcellular_location":"Nucleus; Cytoplasm; Cytoplasm, perinuclear region; Mitochondrion matrix; Chromosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q06609/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RAD51","classification":"Common Essential","n_dependent_lines":1171,"n_total_lines":1208,"dependency_fraction":0.9693708609271523},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RAD51","total_profiled":1310},"omim":[{"mim_id":"621430","title":"FIGNL1-INTERACTING REGULATOR OF RECOMBINATION AND MITOSIS; FIRRM","url":"https://www.omim.org/entry/621430"},{"mim_id":"621422","title":"TELOMERASE RNA COMPONENT-INTERACTING RNase; TRIR","url":"https://www.omim.org/entry/621422"},{"mim_id":"621002","title":"PREMATURE OVARIAN FAILURE 25; POF25","url":"https://www.omim.org/entry/621002"},{"mim_id":"621001","title":"SPERMATOGENIC FAILURE 96; SPGF96","url":"https://www.omim.org/entry/621001"},{"mim_id":"620693","title":"ASTEROID HOMOLOG 1; ASTE1","url":"https://www.omim.org/entry/620693"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli","reliability":"Supported"},{"location":"Mitochondria","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":14.6},{"tissue":"testis","ntpm":22.6}],"url":"https://www.proteinatlas.org/search/RAD51"},"hgnc":{"alias_symbol":["HsRad51","HsT16930","BRCC5","FANCR"],"prev_symbol":["RAD51A","RECA"]},"alphafold":{"accession":"Q06609","domains":[{"cath_id":"1.10.150.20","chopping":"25-80","consensus_level":"high","plddt":95.7711,"start":25,"end":80},{"cath_id":"3.40.50.300","chopping":"96-335","consensus_level":"high","plddt":95.1997,"start":96,"end":335}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06609","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q06609-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q06609-F1-predicted_aligned_error_v6.png","plddt_mean":91.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAD51","jax_strain_url":"https://www.jax.org/strain/search?query=RAD51"},"sequence":{"accession":"Q06609","fasta_url":"https://rest.uniprot.org/uniprotkb/Q06609.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q06609/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06609"}},"corpus_meta":[{"pmid":"20729832","id":"PMC_20729832","title":"Purified 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BRCA2 does not mediate ssDNA annealing.\",\n      \"method\": \"Biochemical reconstitution with purified full-length BRCA2 and RAD51; strand-exchange assays, RPA displacement assays, ATP hydrolysis measurements\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified full-length proteins, multiple orthogonal biochemical assays in a landmark single study\",\n      \"pmids\": [\"20729832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Yeast Rad52 protein stimulates DNA strand exchange by Rad51 by targeting Rad51 to RPA-coated ssDNA, overcoming the inhibitory effect of RPA on presynaptic filament formation; stimulation requires concerted action of Rad51, Rad52, and RPA via specific protein-protein interactions.\",\n      \"method\": \"In vitro DNA strand exchange assays with purified yeast Rad51, Rad52, and RPA; protein interaction studies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, replicated across two papers (PMID:9450760 and PMID:9450758)\",\n      \"pmids\": [\"9450760\", \"9450758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Yeast Rad54 protein physically interacts with Rad51 and strongly stimulates the rate of homologous DNA pairing between ssDNA and dsDNA catalyzed by Rad51; Rad54 possesses a dsDNA-dependent ATPase activity.\",\n      \"method\": \"Purification of Rad54 to near homogeneity; in vitro homologous pairing assays; ATPase assays; protein interaction studies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified proteins, multiple orthogonal assays\",\n      \"pmids\": [\"9590697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Purified human RAD51 (HsRad51) catalyzes ATP-dependent homologous pairing and DNA strand exchange in vitro; rates of ATP hydrolysis, homologous pairing, and strand exchange by HsRad51 are less than 1/10 those of RecA. In the presence of ATP-γS, HsRad51 forms stable presynaptic complexes and promotes renaturation but does not catalyze strand exchange or homologous pairing with duplex DNA, suggesting that homologous pairing and strand exchange by HsRad51 are more closely linked to ATP hydrolysis than in RecA.\",\n      \"method\": \"In vitro biochemical assays with purified HsRad51; ATPase assays, homologous pairing, strand exchange assays with ATP and ATP-γS\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzymatic characterization with purified protein and multiple assay conditions\",\n      \"pmids\": [\"9012806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human Rad52 stimulates homologous pairing by human Rad51; hRad52 binds ssDNA and is involved in an early stage of Rad51-mediated recombination.\",\n      \"method\": \"In vitro homologous pairing assays with purified hRad51 and hRad52\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified human proteins, consistent with parallel yeast work\",\n      \"pmids\": [\"9450758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"BRCA2 BRC repeats (BRC3 and BRC4) bind RAD51-DNA nucleoprotein filaments at lower molar ratios and only disrupt filaments at high concentrations. BRC3 contacts the N-terminal domain of RAD51 and BRC4 contacts the nucleotide-binding core, showing that BRC repeats are non-equivalent in their mode of interaction with RAD51 filaments.\",\n      \"method\": \"Cryo-EM structural analysis of RAD51-DNA filaments with BRC peptides; biochemical binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structural analysis combined with functional binding data, single study\",\n      \"pmids\": [\"15937124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human Rad51 redistributes to selectively UV-damaged, halogenated-thymidine-labeled chromatin after UV microirradiation, with recruitment occurring from pre-existing S-phase nuclear foci. Rad51 foci associate preferentially with postreplicative rather than replicating chromatin, supporting a role in recombinational repair of damage in postreplicative chromatin.\",\n      \"method\": \"UV microirradiation of small nuclear areas combined with halogenated thymidine labeling and immunofluorescence; confocal microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with functional implication, single lab, two complementary labeling approaches\",\n      \"pmids\": [\"10908572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RAD51 is required for more than 95% of break-induced replication (BIR) events at unique chromosomal sequences in yeast, demonstrating a genetic requirement for RAD51 in strand invasion during BIR.\",\n      \"method\": \"Chromosome fragmentation assay in S. cerevisiae; genetic epistasis analysis using rad51 deletion mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in yeast with quantitative BIR assay, single lab\",\n      \"pmids\": [\"14993274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human RAD51 paralogs (XRCC2, XRCC3, RAD51B, RAD51C, RAD51D) form simultaneous protein interactions with each other and with HsRAD51; three-hybrid and baculovirus co-purification experiments show that some interactions (e.g., RAD51B-RAD51D) require a third paralog (RAD51C) to occur, suggesting they may form multi-protein complexes.\",\n      \"method\": \"Yeast two-hybrid, yeast three-hybrid, and baculovirus co-purification with 6xHis-tagged proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction mapping with two orthogonal systems (yeast two/three-hybrid and baculovirus pulldown), single lab\",\n      \"pmids\": [\"10749867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The C-terminal region of HsRad51 contains amino acid residues required for binding to HsRad52; mutations in this region (not the N-terminal domain) impair HsRad52 binding. The HsRad51 F259V mutation, which abrogates HsRad52 binding, reduces the stimulation of homologous pairing that occurs with both proteins together without affecting HsRad51-only pairing, establishing that the HsRad51-HsRad52 interaction is important for cooperative homologous pairing.\",\n      \"method\": \"Yeast two-hybrid analysis; random mutagenesis; in vitro homologous pairing assays with purified mutant and wild-type proteins\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay with defined mutants, single lab with multiple approaches\",\n      \"pmids\": [\"10448035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Efficient turnover of Rad51 from dsDNA after strand exchange requires both the Rad51 ATPase activity and the Rad54 ATPase activity; the catalytic efficiency of Rad54's ATPase is stimulated by Rad51 partial filaments on dsDNA. The Rad51-K191R ATPase-dead mutant forms filaments with significantly increased stability on DNA.\",\n      \"method\": \"Kinetic ATPase assays; electron microscopy of nucleoprotein filaments; experiments with wild-type Rad51, Rad51-K191R mutant, and Rad54 proteins\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with ATPase-dead mutants and EM, single lab\",\n      \"pmids\": [\"17567608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rad51 inhibits Rad52-mediated annealing of complementary ssDNA in an ATP-dependent manner through specific protein-protein interaction; the Rad51 nucleoprotein filament is more inhibitory than free Rad51. Rad59 partially restores Rad52 annealing in the presence of Rad51, suggesting coordinated channeling of processed DSBs to either strand invasion or annealing pathways.\",\n      \"method\": \"In vitro ssDNA annealing assays with purified yeast Rad51, Rad52, Rad59, and RPA; protein interaction studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution assays with purified proteins, single lab, multiple conditions tested\",\n      \"pmids\": [\"18337252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human Rad51 specifically stimulates the branch migration activity of human Rad54 through protein-protein interactions; the active conformation of the hRad51 filament is more stimulatory than the inactive form. This stimulation is evolutionarily conserved (also observed with yeast proteins).\",\n      \"method\": \"In vitro branch migration assays with purified hRad51, hRad54, yeast Rad51, and Rad54; protein interaction assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution, single lab, tested in two species\",\n      \"pmids\": [\"18617519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human PSF directly interacts with RAD51 through its N-terminal region and modulates RAD51-mediated homologous pairing and strand exchange in a concentration-dependent biphasic manner: stimulating at low RAD51 concentrations and inhibiting at optimal RAD51 concentrations.\",\n      \"method\": \"Co-immunoprecipitation; in vitro homologous pairing and strand exchange assays with purified PSF and RAD51; deletion analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding and in vitro reconstitution assays, single lab\",\n      \"pmids\": [\"19447914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The C. elegans RAD51 paralog complex RFS-1/RIP-1 binds pre-synaptic RAD51 filaments and remodels them to a stabilized, 'open,' and flexible conformation in which ssDNA is more accessible and RAD51 dissociation rate is reduced. Walker box mutations in RFS-1 that abolish filament remodeling also abolish stimulation of RAD51 strand exchange, demonstrating that remodeling activity is essential for function.\",\n      \"method\": \"Biochemical filament remodeling assays; single-molecule imaging; electron microscopy; mutagenesis of Walker box motifs\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution, single-molecule imaging, EM, and structure-function mutagenesis in one study\",\n      \"pmids\": [\"26186187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TOPBP1 promotes PLK1 kinase-mediated phosphorylation of RAD51 at serine 14, which is required for RAD51 recruitment to chromatin (chromatin loading and foci formation) during homologous recombination repair; TOPBP1 BRCT domains 7/8 are essential for RAD51 foci formation.\",\n      \"method\": \"siRNA screen; co-immunoprecipitation; chromatin fractionation; RAD51 foci assays; phosphorylation mapping\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical and cell biological approaches, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"26811421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RADX antagonizes RAD51 by competing with RAD51 for binding to ssDNA, modulating the amount of RAD51 at stalled replication forks. Loss of RADX restores fork protection in BRCA1-, BRCA2-, FANCA-, FANCD2-, or BOD1L-deficient cells; overexpression of RADX causes fork degradation dependent on MRE11 and DNA2 nucleases and fork reversal.\",\n      \"method\": \"siRNA knockdown, RADX overexpression, DNA fiber assays, epistasis analysis in multiple HR-deficient backgrounds\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis across multiple deficient backgrounds, single lab, complementary cell biological approaches\",\n      \"pmids\": [\"30021152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RADX directly and selectively interacts with ATP-bound RAD51, stimulates RAD51 ATP hydrolysis, and destabilizes RAD51 nucleofilaments, thereby inhibiting RAD51 strand exchange and D-loop formation. BRCA2 can overcome RADX-dependent RAD51 inhibition, placing RADX in functional opposition to BRCA2 in regulating RAD51 nucleofilament stability during DNA replication.\",\n      \"method\": \"In vitro strand exchange and D-loop assays with purified proteins; direct binding assays with ATP-bound RAD51; ATPase stimulation assays; single-molecule imaging; DNA fiber assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, single-molecule imaging, ATPase assays, and cellular epistasis in one study\",\n      \"pmids\": [\"33453169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RADX condenses ssDNA filaments (including RPA-coated ssDNA) via higher-order assemblies, blocks RPA displacement by RAD51, and prevents RAD51 loading onto ssDNA, functioning as a negative regulator of RAD51 filament formation.\",\n      \"method\": \"Single-molecule imaging of purified proteins on ssDNA curtains; in vitro RAD51 loading assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct single-molecule visualization of mechanism with purified proteins, single lab\",\n      \"pmids\": [\"32621611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RAD51 uses its strand exchange activity to bypass the CMG replicative helicase (which remains bound to a stalled fork) during replication fork reversal. If the helicase is unloaded, RAD51 is no longer required for fork reversal. Thus RAD51 creates a parental DNA duplex behind the helicase that DNA translocases use for branch migration to generate the reversed fork structure.\",\n      \"method\": \"Auxin-inducible degron (AID) system to deplete CMG components; DNA fiber assays; epistasis analysis in human cells\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with conditional depletion, single lab, mechanistic model supported by multiple genetic conditions\",\n      \"pmids\": [\"37104614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RAD51 deficiency leads to accumulation of self-DNA in the cytoplasm, triggering a STING-mediated innate immune response; the unprotected nascent genome in RAD51-deficient cells is degraded by MRE11 exonuclease, and the resulting fragmented nascent DNA accumulates in the cytosol to initiate innate immune signaling.\",\n      \"method\": \"RAD51 siRNA knockdown; cytosolic DNA detection; STING pathway activation assays; epistasis with MRE11 inhibition\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with cytosolic DNA detection and epistasis, single lab\",\n      \"pmids\": [\"28334891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FANCI-FANCD2 (I-D) complex directly binds RAD51 and stabilizes the RAD51-DNA filament in a manner requiring the DNA-binding activity of FANCI; the stabilized filament protects the 5'-DNA end from FAN1 nucleolytic degradation. The RAD51 mutant from FANCR patient cells fails to achieve this protection.\",\n      \"method\": \"Co-immunoprecipitation; in vitro RAD51 filament stability assays with purified I-D complex; nuclease protection assays; patient-derived RAD51 mutant analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins and disease-relevant mutation, single lab\",\n      \"pmids\": [\"27694619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HOP2-MND1 heterodimer stimulates RAD51 DNA strand exchange by inducing conformational changes in RAD51 that enhance interaction with nucleotide cofactors, modify DNA-binding specificity, facilitate RAD51 loading onto ssDNA, and promote dsDNA binding during the homology search; HOP2-MND1 enables strand exchange in the absence of divalent metal ions and offsets the K133A ATP-binding mutation.\",\n      \"method\": \"In vitro strand exchange assays; nucleotide binding assays; DNA binding specificity assays with purified RAD51 and HOP2-MND1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple assays and defined mutants, single lab\",\n      \"pmids\": [\"24943459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The conserved aspartate at the inter-subunit ATP cap (Asp-316 in human RAD51) forms a salt bridge with the ATP γ-phosphate in the nucleoprotein filament, enhancing filament turnover at the expense of recombinase activity; substitution of Asp-316 with lysine (HsRAD51-D316K) decreases NPF turnover and markedly improves strand exchange activity in the absence of salt.\",\n      \"method\": \"Biochemical nucleoprotein filament assays; strand exchange assays; electron microscopy of archaebacterial RadA and human RAD51 D316K mutant filaments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution, structural analysis (EM), and mutagenesis with functional validation in one study\",\n      \"pmids\": [\"22275364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Yeast Rad51 is phosphorylated on Ser192 in a DNA-damage-responsive manner primarily mediated by the Mec1 kinase; Ser192 Ala and Glu mutations confer hypersensitivity to DNA damage and homologous recombination defects. Ser192 is required for Rad51 ATPase activity and DNA-binding activity in vitro but not for multimer formation.\",\n      \"method\": \"In vivo phosphorylation mapping; in vitro ATPase and DNA-binding assays with Ser192 mutants; DNA damage sensitivity assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical characterization of mutants combined with in vivo epistasis, single lab\",\n      \"pmids\": [\"21738226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The HsRAD51B-HsRAD51C heterodimer forms a stable complex on ssDNA and partially stabilizes HsRAD51 nucleoprotein filaments against BLM helicase anti-recombinogenic activity; HsRAD51B-HsRAD51C also stimulates HsRAD51-mediated D-loop formation in the presence of RPA but does not facilitate RAD51 nucleation on RPA-coated ssDNA.\",\n      \"method\": \"In vitro filament stability assays; D-loop assays with purified HsRAD51, HsRAD51B-HsRAD51C, RPA, and BLM\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins, single lab, multiple assay types\",\n      \"pmids\": [\"23810717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TOPORS acts as a SUMO E3 ligase that SUMOylates RAD51 at lysine residues 57 and 70 in response to DNA damage; TOPORS SUMOylation is facilitated by ATM-induced phosphorylation of TOPORS at Thr515. SUMOylation of RAD51 is required for its chromatin recruitment and homologous recombination repair; SUMOylation-deficient RAD51 has reduced association with BRCA2.\",\n      \"method\": \"Mass spectrometry identification of SUMOylation sites; TOPORS knockdown; mutant (K57R/K70R) RAD51 expression; chromatin fractionation; RAD51 foci assays; Co-IP of RAD51 with BRCA2\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary approaches, single lab, defined modification sites with functional validation\",\n      \"pmids\": [\"35061896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAD51 protects under-replicated DNA in mitotic cells and promotes mitotic DNA synthesis (MiDAS) and successful chromosome segregation; MiDAS requires de novo RAD51 recruitment to ssDNA supported by Polo-like kinase 1 (PLK1)-mediated phosphorylation of RAD51. Acute inhibition of MiDAS delays anaphase onset and induces centromere fragility.\",\n      \"method\": \"Acute RAD51 inhibition; EdU incorporation assays for MiDAS; PLK1 inhibition; live-cell imaging; centromere fragility quantification\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays, single lab, defined kinase-substrate relationship\",\n      \"pmids\": [\"34508092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BRCA2's C-terminal TR2 motif binds across the protomer interface in the RAD51 nucleoprotein filament, acting as a brace for adjacent RAD51 molecules by targeting an acidic-patch motif on RAD51; structure-guided mutagenesis validated the functional importance of this interaction for filament stabilization.\",\n      \"method\": \"Cryo-electron microscopy of RAD51-TR2 complexes; structure-guided mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with structure-guided mutagenesis and functional validation in one study\",\n      \"pmids\": [\"37919288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BRCA2 accelerates nucleation of RAD51 onto RPA-coated ssDNA to a rate approaching RAD51 association with naked ssDNA, eliminating the rate-limiting nucleation step by chaperoning a short preassembled RAD51 filament onto the ssDNA; a RAD51 dimer is the minimal unit required for spontaneous nucleation but growth self-terminates below the diffraction limit in the absence of BRCA2.\",\n      \"method\": \"Single-molecule microfluidics, microscopy, and micromanipulation with full-length BRCA2 and RAD51 on individual DNA molecules mimicking resected lesions\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — single-molecule reconstitution with full-length proteins, quantitative kinetic analysis, single lab with rigorous controls\",\n      \"pmids\": [\"36976771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RAD51 nucleofilaments specifically recognize and protect abasic sites in ssDNA; abasic sites increase the RAD51 association rate to DNA. In the absence of BRCA2 or RAD51, abasic sites accumulate and induce abasic ssDNA gaps that make replicating DNA fibers sensitive to APE1. RAD51 assembled on abasic DNA prevents cleavage by the MRE11-RAD50 complex, suppressing replication fork breakage.\",\n      \"method\": \"Cryo-EM structure of RAD51 on abasic-site-containing DNA; Xenopus egg extract experiments; human cell experiments; DNA fiber assays; nuclease protection assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure, Xenopus extract reconstitution, and human cell validation in one study\",\n      \"pmids\": [\"39178838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAD51 physically interacts with TERRA lncRNA and catalyzes R-loop formation with TERRA in vitro, directly promoting TERRA recruitment to telomeres by strand invasion in trans; this process is counteracted by RNaseH1 and TRF1.\",\n      \"method\": \"In vitro R-loop formation assay with purified RAD51 and TERRA; reporter system for TERRA-telomere association; RNaseH1/TRF1 counteraction assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution of R-loop formation, single lab, supported by cellular reporter assays\",\n      \"pmids\": [\"33057192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAD51 helicase HELQ is strongly stimulated by RAD51 during DNA unwinding via direct complex formation; conversely, RPA inhibits HELQ DNA unwinding but stimulates its DNA strand annealing activity.\",\n      \"method\": \"Biochemical helicase and annealing assays with purified HELQ, RAD51, and RPA; single-molecule imaging; Co-IP\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution and single-molecule imaging, single lab\",\n      \"pmids\": [\"34937945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FANCD2, independent of FANCI dimerization, stabilizes RAD51 filaments to inhibit DNA2, MRE11, and EXO1 nucleases at stalled replication forks; additionally, FANCD2 acts as a RAD51 mediator to stimulate RAD51 strand exchange activity, providing a mechanistic link between FANCD2 and BRCA2 in the FA/BRCA fork protection pathway.\",\n      \"method\": \"In vitro nuclease protection assays and strand exchange assays with purified FANCD2, RAD51, DNA2, MRE11, EXO1; RAD51 filament stability assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple purified nucleases, single lab\",\n      \"pmids\": [\"37526271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HsRad51 is proteolytically cleaved during apoptosis in human T-lymphocyte cell lines with similar kinetics to PARP cleavage; cleavage is blocked by the caspase inhibitor Ac-DEVD-CHO, implicating a DEVD-specific caspase, though purified caspases 2, 3, or 6-10 could not individually cleave HsRad51 in vitro.\",\n      \"method\": \"Immunoblotting of apoptotic cell lysates; cell-free apoptosis system with IVT-HsRad51; caspase inhibitor experiments\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-free system combined with caspase inhibitor assays, single lab\",\n      \"pmids\": [\"9607320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Depletion of HsRad51 from human cell-free extracts diminishes triplex-induced recombination, and supplementation with purified HsRad51 restores it, establishing that HsRad51 is required for triplex-induced intermolecular recombination in human cell extracts.\",\n      \"method\": \"Immunodepletion and reconstitution in human cell-free extracts; supF reporter assay for recombination\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — immunodepletion/reconstitution approach in cell-free system, single lab\",\n      \"pmids\": [\"11278954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RAD51 Cys319 is a functionally significant redox-regulated site; oxidation of Cys319 disrupts DNA binding (molecular dynamics simulations show DNA dissociation from oxidized Cys319 RAD51 filament). Peroxiredoxin 1 (PRDX1) maintains Cys319 in a reduced state, and loss of PRDX1 leads to increased sulfenylation of RAD51 Cys319, impaired RAD51 foci formation, and decreased homologous recombination.\",\n      \"method\": \"Cys319 mutagenesis; molecular dynamics simulation; sulfenylation probe (DAz-2) labeling in PRDX1-deficient cells; RAD51 foci assays; HR reporter assays\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with MD simulation and cellular assays, single lab\",\n      \"pmids\": [\"36058112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Centromeric DNA breaks in quiescent human cells are resolved enzymatically by RAD51 recombinase, which safeguards the specification of functional centromeres.\",\n      \"method\": \"Single-cell imaging strategy for DNA breaks at repetitive centromeric regions; RAD51 inhibition in quiescent cells; centromere integrity assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct imaging with RAD51 inhibition demonstrating functional requirement, single lab\",\n      \"pmids\": [\"36702125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAD51 protects replication forks from transcription-replication conflicts (TRCs); RAD51-deficient regions enriched for early-S-phase replication and transcription show increased fork breakage, and inhibiting early S-phase transcription ameliorates many adverse effects of RAD51 depletion.\",\n      \"method\": \"RAD51 depletion; DNA fiber assays; transcription inhibition epistasis; genomic mapping of affected loci\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis between RAD51 and transcription, single lab, with genomic mapping\",\n      \"pmids\": [\"36002000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of human RAD51-DNA complexes reveal that Loop2 residues V273 and D274 in RAD51 (vs. P274 and G275 in DMC1) are key determinants of mismatch intolerance during strand exchange; these differences in Loop2 that contact both ssDNA and the complementary strand explain why RAD51 does not permit HR in the presence of mismatches whereas DMC1 does.\",\n      \"method\": \"Cryo-EM structures of Rad51-DNA and Dmc1-DNA complexes; molecular dynamics simulation; single-molecule FRET assays; site-directed mutagenesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure, MD simulation, smFRET, and mutagenesis in one study\",\n      \"pmids\": [\"34871438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In vivo, Rad51-ssDNA nucleoprotein filaments in budding yeast span the entire nucleus following DSB induction, adopting diverse shapes not seen in vitro; the filaments undergo cycles of compaction and extension modulated by Rad54 (promotes extension) and Srs2 (promotes compaction), and this compaction-extension dynamic constitutes a robust nuclear homology search strategy.\",\n      \"method\": \"Functional fluorescently tagged Rad51 expressed from endogenous locus; live-cell single-molecule imaging; DSB induction; genetic analysis with rad54 and srs2 mutants; biophysical modeling\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — first functional tag enabling in vivo single-molecule tracking, combined with genetic mutants and biophysical modeling\",\n      \"pmids\": [\"37605042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rad51 facilitates Dmc1 nucleoprotein filament assembly during meiosis through direct physical interaction; Dmc1 nucleation is stimulated by short Rad51 patches on DNA, and pull-down assays confirm a physical interaction between ScDmc1 and ScRad51 but not between ScDmc1 and EcRecA.\",\n      \"method\": \"Single-molecule tethered particle motion assays for filament assembly kinetics; in vitro biochemical filament assays; pull-down experiments with purified proteins\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule and biochemical reconstitution, single lab\",\n      \"pmids\": [\"32404423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rad51 and Dmc1 have an intrinsic ability to self-segregate within mixed presynaptic filaments in vitro, without any accessory proteins; Dmc1 stabilizes adjacent Rad51 filament segments, suggesting cross-talk between the two recombinases.\",\n      \"method\": \"Single-molecule imaging of Rad51 and Dmc1 presynaptic complex assembly on ssDNA curtains\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule visualization with purified proteins, single lab\",\n      \"pmids\": [\"29382724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human RAD52 binds tightly to RPA-ssDNA and imposes an inhibitory effect on RPA turnover; during RAD51 presynaptic complex assembly, most RPA and RAD52 are displaced but some RAD52-RPA-ssDNA clusters persist interspersed within RAD51 filaments; once RAD51 filament assembles, it restricts new RAD52 binding events but RAD52 re-binds after RAD51 dissociation.\",\n      \"method\": \"Single-molecule imaging on ssDNA curtains with purified human RAD52, RPA, and RAD51\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule visualization with purified human proteins, single lab\",\n      \"pmids\": [\"28551686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"BRCA2 gene product forms in vivo complexes with both RAD51 and p53 in human cells; BRCA2 is a nuclear phosphoprotein, and exogenous BRCA2 expression inhibits p53's transcriptional activity with RAD51 coexpression enhancing this inhibitory effect.\",\n      \"method\": \"Co-immunoprecipitation from cell lysates; transient transfection; p53 transcriptional reporter assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP combined with functional transcription assay, single lab\",\n      \"pmids\": [\"9811893\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAD51 is a RecA-family ATPase recombinase that assembles as a nucleoprotein filament on ssDNA at resected DNA double-strand breaks and stalled replication forks; the filament performs homology search and ATP-hydrolysis-coupled strand exchange with homologous duplex DNA, activities controlled by a network of regulators including BRCA2 (which nucleates and stabilizes the filament on RPA-coated ssDNA by chaperoning preassembled RAD51 dimers), Rad52/RAD52 (which recruits RAD51 to RPA-ssDNA and coordinates with strand annealing), Rad54 (which stimulates pairing via dsDNA-dependent ATPase and facilitates filament turnover from dsDNA), RAD51 paralogs (which remodel and stabilize pre-synaptic filaments), RADX (which antagonizes filament formation by competing for ssDNA and stimulating RAD51 ATPase), and post-translational modifications including Mec1/PLK1-dependent phosphorylation and TOPORS-dependent SUMOylation that control chromatin loading; beyond DSB repair, RAD51 uses its strand exchange activity to catalyze replication fork reversal while bypassing the stalled CMG helicase, protects nascent DNA strands and abasic sites from nucleolytic degradation, suppresses transcription-replication conflicts, promotes mitotic DNA synthesis, and in the absence of RAD51 unprotected nascent DNA is degraded by MRE11, generating cytosolic DNA fragments that activate STING-mediated innate immune signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAD51 is the central eukaryotic recombinase that assembles as an ATP-dependent nucleoprotein filament on single-stranded DNA and catalyzes homology search and DNA strand exchange, the core reaction of homologous recombination [#3]. Filament assembly on RPA-coated ssDNA is rate-limited by nucleation, which BRCA2 overcomes by chaperoning a preassembled RAD51 nucleus onto ssDNA, displacing RPA and stabilizing the filament against ATP hydrolysis [#0, #29]; a C-terminal BRCA2 TR2 motif braces adjacent protomers across the filament interface, while the BRC repeats engage distinct RAD51 surfaces [#28, #5]. The filament's recombinase activity is intrinsically coupled to ATP hydrolysis and to an inter-subunit ATP cap that tunes turnover versus strand-exchange efficiency [#3, #23], and Loop2 residues impose strict mismatch intolerance that distinguishes RAD51 from its meiotic counterpart DMC1 [#39]. A broad network of mediators governs the filament: RAD52 targets RAD51 to RPA-ssDNA and channels lesions between strand invasion and annealing [#1, #4, #11], Rad54 stimulates homologous pairing and branch migration and drives ATPase-dependent filament turnover from duplex DNA [#2, #10, #12], the RAD51 paralogs assemble into complexes that remodel and stabilize presynaptic filaments [#8, #14, #25], and HOP2-MND1 and FANCD2/FANCI further stimulate or stabilize the filament [#22, #21, #33]. Filament abundance at replication forks is set antagonistically by RADX, which competes for ssDNA, stimulates RAD51 ATPase, and destabilizes filaments in opposition to BRCA2 [#16, #17, #18]. Chromatin loading is controlled by post-translational modification, including TOPBP1/PLK1-dependent Ser14 phosphorylation, Mec1-dependent phosphorylation of the yeast enzyme, and TOPORS-dependent SUMOylation [#15, #24, #26]. Beyond canonical double-strand break repair and break-induced replication [#7], RAD51 protects stalled and nascent replication forks—catalyzing fork reversal while bypassing the bound CMG helicase, shielding abasic sites and nascent strands from MRE11/DNA2/EXO1 nucleases, and suppressing transcription-replication conflicts [#19, #30, #33, #38]; in its absence, MRE11-driven degradation of unprotected nascent DNA releases cytosolic fragments that activate STING-mediated innate immunity [#20]. RAD51 also promotes mitotic DNA synthesis and centromere integrity [#27, #37] and forms TERRA R-loops at telomeres [#31].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that purified human RAD51 is itself a recombinase defined the protein's core catalytic activity and its mechanistic relationship to bacterial RecA.\",\n      \"evidence\": \"In vitro ATPase, homologous pairing, and strand exchange assays with purified HsRad51 under ATP and ATP-\\u03b3S\",\n      \"pmids\": [\"9012806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how the slow human enzyme is regulated in cells\", \"No structure of the active filament\", \"Mediators required for activity on RPA-coated ssDNA not identified\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying Rad52 and Rad54 as direct RAD51 stimulators showed the recombinase does not act alone but requires mediators to load onto RPA-ssDNA and to complete pairing.\",\n      \"evidence\": \"In vitro strand exchange, homologous pairing, and ATPase assays with purified yeast and human Rad51, Rad52, Rad54, and RPA\",\n      \"pmids\": [\"9450760\", \"9450758\", \"9590697\", \"9012806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the in vivo order of mediator action\", \"Structural basis of Rad51-Rad52 and Rad51-Rad54 contacts unresolved\", \"Did not explain how channeling between invasion and annealing is decided\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Mapping the RAD51 C-terminal residues required for RAD52 binding linked a specific protein-protein interaction to cooperative homologous pairing.\",\n      \"evidence\": \"Yeast two-hybrid, random mutagenesis, and in vitro pairing assays with the F259V mutant\",\n      \"pmids\": [\"10448035\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single interface mapped without structure\", \"Did not test consequences in cells\", \"Other RAD52 contacts not excluded\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Live-cell relocalization to damaged postreplicative chromatin connected RAD51 biochemistry to a cellular site of action in S-phase repair.\",\n      \"evidence\": \"UV microirradiation with halogenated thymidine labeling and immunofluorescence\",\n      \"pmids\": [\"10908572\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative localization, not direct demonstration of repair\", \"Recruitment factors not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Genetic requirement for RAD51 in break-induced replication extended its role beyond gene conversion to replication-associated repair.\",\n      \"evidence\": \"Chromosome fragmentation assay and rad51 epistasis in S. cerevisiae\",\n      \"pmids\": [\"14993274\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Yeast genetics, not direct biochemical mechanism\", \"Did not define the replication machinery coupling\", \"Human relevance not tested here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining how RAD51 inhibits RAD52 annealing and stimulates Rad54 branch migration showed the filament actively partitions DSBs between recombination subpathways.\",\n      \"evidence\": \"In vitro annealing and branch migration assays with purified Rad51, Rad52, Rad59, Rad54, and conformation comparisons\",\n      \"pmids\": [\"18337252\", \"18617519\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro only\", \"In vivo pathway-choice control not established\", \"Role of additional regulators in channeling not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating that the RAD51 paralog complex remodels presynaptic filaments to a stabilized open conformation defined a mechanistic role for paralogs distinct from BRCA2-mediated nucleation.\",\n      \"evidence\": \"Filament remodeling, single-molecule imaging, EM, and Walker-box mutagenesis of C. elegans RFS-1/RIP-1\",\n      \"pmids\": [\"26186187\", \"10749867\", \"23810717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human paralog complex stoichiometry not fully resolved\", \"Structural basis of remodeling unknown\", \"Coordination with BRCA2 in vivo not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identifying TOPBP1/PLK1-dependent Ser14 phosphorylation and TOPORS-dependent SUMOylation established post-translational control of RAD51 chromatin loading.\",\n      \"evidence\": \"siRNA screens, phosphorylation/SUMO site mapping, chromatin fractionation, and foci assays\",\n      \"pmids\": [\"26811421\", \"35061896\", \"21738226\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How modifications mechanistically alter filament assembly not fully resolved\", \"Crosstalk between phosphorylation and SUMOylation untested\", \"Modification dynamics during repair not measured\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linking RAD51 loss to MRE11-driven nascent-DNA degradation and cytosolic self-DNA accumulation connected fork protection to STING innate immune signaling.\",\n      \"evidence\": \"RAD51 knockdown, cytosolic DNA detection, STING activation, and MRE11 epistasis\",\n      \"pmids\": [\"28334891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Knockdown rather than separation-of-function alleles\", \"Quantitative link between fork protection defect and immune output not established\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Establishing RADX as a ssDNA-competing antagonist that opposes BRCA2 defined how filament abundance at forks is tuned downward.\",\n      \"evidence\": \"siRNA, RADX overexpression, DNA fiber assays, and epistasis across multiple HR-deficient backgrounds\",\n      \"pmids\": [\"30021152\", \"32621611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular epistasis preceded full biochemical mechanism\", \"Conditions favoring RADX over BRCA2 unclear\", \"Regulation of RADX itself not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Reconstituting RADX with purified RAD51 showed it selectively binds ATP-bound RAD51, stimulates ATP hydrolysis, and destabilizes filaments, placing it in direct functional opposition to BRCA2.\",\n      \"evidence\": \"In vitro strand exchange, D-loop, ATPase, and single-molecule assays with purified proteins\",\n      \"pmids\": [\"33453169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of RADX-RAD51 selectivity unknown\", \"Switch between RADX and BRCA2 dominance in vivo not defined\", \"Fork-specific recruitment not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanding RAD51's roles to mitotic DNA synthesis, transcription-replication conflict suppression, telomeric TERRA R-loop formation, and HELQ stimulation broadened the recombinase into a general genome-protection factor.\",\n      \"evidence\": \"Acute RAD51/PLK1 inhibition, MiDAS and fiber assays, in vitro R-loop and helicase reconstitution, single-molecule imaging\",\n      \"pmids\": [\"34508092\", \"36002000\", \"33057192\", \"34937945\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these functions use the canonical filament or distinct assemblies is partly unresolved\", \"In vivo contributions of each function not quantitatively partitioned\", \"Mostly single-lab demonstrations\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mechanistic resolution of fork reversal and in-cell filament dynamics showed RAD51 strand exchange generates a parental duplex behind the bound CMG helicase and that filaments scan the nucleus via compaction-extension cycles.\",\n      \"evidence\": \"CMG degron and fiber assays in human cells; in vivo single-molecule tracking of endogenously tagged Rad51 in yeast with rad54/srs2 mutants\",\n      \"pmids\": [\"37104614\", \"37605042\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the RAD51-CMG-fork intermediate unknown\", \"How filament shape is read out for homology search not resolved\", \"Human in vivo filament dynamics not directly imaged\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Structural and functional demonstration that RAD51 recognizes and protects abasic sites refined its fork-protection role to specific lesion types.\",\n      \"evidence\": \"Cryo-EM of RAD51 on abasic DNA, Xenopus extract and human cell experiments, fiber and nuclease protection assays\",\n      \"pmids\": [\"39178838\", \"37526271\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How abasic recognition is regulated by mediators unclear\", \"Relationship to ATPase cycle not fully defined\", \"In vivo abundance of abasic-protected filaments unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the competing mediator and antagonist network, post-translational modifications, and lesion-specific recognition are integrated to determine RAD51 filament fate at any given genomic site.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of the regulated filament in its cellular context\", \"Quantitative thresholds for BRCA2-versus-RADX dominance unknown\", \"How modification state biases between repair, fork protection, and immune signaling not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 23, 39, 30]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [3, 10, 23]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [3, 35, 31]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 40]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [6, 15, 26, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 3, 7]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [19, 30, 38]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [27, 37]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"complexes\": [\n      \"RAD51-ssDNA presynaptic nucleoprotein filament\",\n      \"RAD51 paralog complex (RAD51B-RAD51C)\"\n    ],\n    \"partners\": [\n      \"BRCA2\",\n      \"RAD52\",\n      \"RAD54\",\n      \"RADX\",\n      \"FANCD2\",\n      \"HELQ\",\n      \"RAD51C\",\n      \"DMC1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}