{"gene":"RAD51B","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2023,"finding":"Cryo-EM structure, AlphaFold2 modelling, and structural proteomics revealed that the BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2) has RAD51C-RAD51D-XRCC2 mimicking three RAD51 protomers aligned within a nucleoprotein filament, while RAD51B is highly dynamic. Biochemical and single-molecule analyses showed that BCDX2 stimulates nucleation and extension of RAD51 filaments on ssDNA in reactions that depend on the coupled ATPase activities of RAD51B and RAD51C, supporting replication fork protection and double-strand break repair.","method":"Cryo-EM structure determination, AlphaFold2 modelling, structural proteomics, in vitro biochemical assay, single-molecule analysis, ATPase mutagenesis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus reconstituted biochemical assays plus single-molecule analysis with ATPase mutagenesis in a single rigorous study","pmids":["37344587"],"is_preprint":false},{"year":2001,"finding":"RAD51B and RAD51C form a stable heterodimeric complex with ssDNA-binding and ssDNA-stimulated ATPase activities. This Rad51B-Rad51C complex acts as a recombination mediator by alleviating RPA competition with Rad51 for ssDNA binding, facilitating assembly of the Rad51-ssDNA nucleoprotein filament required for DNA strand exchange.","method":"In vitro reconstitution of DNA strand exchange, ATPase assay, ssDNA-binding assay, functional interaction assay with purified proteins","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with multiple orthogonal biochemical assays (ATPase, DNA binding, strand exchange) on purified proteins","pmids":["11751636"],"is_preprint":false},{"year":2002,"finding":"Purified recombinant RAD51B and RAD51C form a highly stable heterodimer (confirmed by Ni-NTA pulldown), both bind single- and double-stranded DNA with preference for 3'-end-tailed duplexes, and both exhibit DNA-stimulated ATPase activity. RAD51B shows no apparent DNA strand exchange activity, while RAD51C does (via duplex destabilization). The heterodimer shows enhanced DNA binding compared to individual proteins.","method":"Baculovirus expression and purification from Sf9 cells, Ni-NTA pulldown, DNA-binding assay, DNA-stimulated ATPase assay, strand exchange assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified recombinant proteins, multiple orthogonal assays (pulldown, DNA binding, ATPase, strand exchange)","pmids":["12427746"],"is_preprint":false},{"year":2001,"finding":"RAD51B and RAD51C form an endogenous heterocomplex in human cells (HeLa, MCF10A, MCF7) confirmed by co-immunoprecipitation. RAD51C is central to a larger multiprotein complex with RAD51B, RAD51D, XRCC2, and XRCC3 that is exclusive of RAD51. The RAD51B/RAD51C complex was also isolated from insect cells by immunoaffinity chromatography.","method":"Co-immunoprecipitation from human cell lines, immunoaffinity chromatography from insect cells co-expressing recombinant proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP confirmed in multiple human cell lines plus independent purification from insect cells","pmids":["11744692"],"is_preprint":false},{"year":2000,"finding":"RAD51B knockout in chicken DT40 cells impairs homologous recombinational repair (reduced targeted integration, sister chromatid exchange, and intragenic recombination), causes spontaneous chromosomal aberrations, sensitizes cells to cisplatin and mitomycin C, and greatly reduces damage-induced RAD51 nuclear focus formation, indicating RAD51B promotes assembly of RAD51 nucleoprotein filaments during HRR.","method":"Gene knockout by homologous recombination in DT40 cells, targeted integration assay, sister chromatid exchange assay, clonogenic survival assay, immunofluorescence for RAD51 foci","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple orthogonal phenotypic readouts (HRR assays, SCE, RAD51 foci), replicated phenotype consistent across assays","pmids":["10938124"],"is_preprint":false},{"year":2004,"finding":"The human BCDX2 complex (RAD51B, RAD51C, RAD51D, XRCC2) preferentially binds branched DNA structures (Y-shaped DNA and synthetic Holliday junctions) over linear ssDNA, dsDNA, or tailed duplexes, and catalyzes strand annealing between a long linear ssDNA and its complementary circular ssDNA.","method":"Competitive DNA-binding assay with seven DNA substrate types, strand-annealing assay with purified BCDX2 complex","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified complex, multiple DNA substrate competition assays, single lab","pmids":["15141025"],"is_preprint":false},{"year":2002,"finding":"Purified human RAD51B protein binds ssDNA and dsDNA in the presence of ATP and Mg2+ or Mn2+, exhibits DNA-dependent ATPase activity, and specifically binds synthetic Holliday junctions over half-cruciform or dsDNA substrates, suggesting a specific role in Holliday junction processing during homologous recombinational repair.","method":"Protein purification, DNA-binding assay with synthetic Holliday junction, half-cruciform, and dsDNA substrates; ATPase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified RAD51B, multiple DNA substrate binding assays and ATPase measurement, single lab","pmids":["12441335"],"is_preprint":false},{"year":2006,"finding":"Haploinsufficiency of RAD51B in human HCT116 cells (via gene targeting) causes mild DNA damage hypersensitivity, reduced sister chromatid exchange, impaired RAD51 focus formation, increased chromosome aberrations, centrosome fragmentation, and aneuploidy. siRNA knockdown of RAD51B in HT1080 cells also causes centrosome fragmentation, demonstrating that biallelic RAD51B expression is required for centrosome integrity and chromosome stability.","method":"Gene targeting in human HCT116 cells, siRNA knockdown in HT1080 cells, clonogenic survival, SCE assay, immunofluorescence for RAD51 foci and centrosomes, karyotyping","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — haploinsufficiency by gene targeting plus siRNA knockdown, multiple orthogonal phenotypic readouts including centrosome fragmentation and aneuploidy","pmids":["16778173"],"is_preprint":false},{"year":2005,"finding":"RAD51B nuclear localization is mediated by an N-terminal KKLK motif (amino acids 4-7) that functions as a nuclear localization signal. Mutation of KKLK results in cytoplasmic retention of EGFP-RAD51B. Nuclear localization of RAD51B is independent of its direct binding partner RAD51C (shown in irs3 mutant cells deficient in RAD51C) and independent of BRCA2 (shown in CAPAN-1 cells).","method":"EGFP-fusion live imaging, site-directed mutagenesis of NLS, immunofluorescence in RAD51C-deficient and BRCA2-mutant cell lines","journal":"Mutagenesis","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization by EGFP fusion + NLS mutagenesis + functional validation in RAD51C-deficient and BRCA2-mutant cells, single lab but multiple orthogonal approaches","pmids":["15701685"],"is_preprint":false},{"year":2009,"finding":"Human EVL (Ena/VASP-like) protein physically binds to both RAD51 and RAD51B (pulldown/binding assay), stimulates RAD51-mediated homologous pairing and strand exchange in vitro, promotes ssDNA annealing alone, and this recombination activity is further enhanced by RAD51B. EVL knockdown impairs RAD51 assembly onto damaged DNA after ionizing radiation or mitomycin C.","method":"Protein-binding assay (pulldown), in vitro strand exchange and DNA annealing assay, siRNA knockdown with immunofluorescence for RAD51 foci","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding and functional assays plus cellular KD, single lab, two orthogonal methods","pmids":["19329439"],"is_preprint":false},{"year":1999,"finding":"Homozygous disruption of muREC2/RAD51L1 in mice causes early embryonic lethality (growth retardation by E5.5, resorption by E8.5), indicating an essential role in early development. Embryonic lethality is partially rescued in a p53-null background, placing muREC2/RAD51L1 in a pathway that intersects with p53 in controlling cell proliferation.","method":"Homologous recombination knockout in embryonic stem cells, timed pregnancy studies, blastocyst outgrowth assay, p53-null background epistasis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with developmental phenotype plus genetic epistasis with p53, replicated in multiple experimental contexts","pmids":["10567591"],"is_preprint":false},{"year":1998,"finding":"Overexpression of wild-type human REC2/RAD51B in CHO cells causes G1 cell cycle delay and UV-induced apoptosis. A point mutation at residue 163 (in the putative Src phosphorylation site) or N-terminal truncation (first 100 amino acids only) abolishes both the G1 delay and UV-induced apoptosis, indicating these functional effects require an intact full-length protein including the Src-site domain.","method":"Stable transfection, FACS cell cycle analysis, UV irradiation, mutagenesis of Src-site residue and truncation constructs","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable overexpression with functional mutagenesis and multiple readouts (cell cycle, apoptosis), single lab","pmids":["9788630"],"is_preprint":false},{"year":2000,"finding":"Human REC2/RAD51B (HsRec2/Rad51L1) exhibits protein kinase activity, phosphorylating the artificial substrate kemptide (serine-containing), myelin basic protein, p53, cyclin E, and cdk2, but not a tyrosine-only peptide substrate, suggesting it can regulate cell cycle proteins through serine/threonine phosphorylation.","method":"In vitro kinase assay with purified HsRec2/Rad51L1 and multiple peptide/protein substrates","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro kinase assay with purified protein and multiple substrates, single lab, not independently replicated; biological significance unclear","pmids":["10623463"],"is_preprint":false},{"year":2022,"finding":"A truncating variant RAD51B c.92delT (leading to reinitiation at Met64) identified in sisters with primary ovarian insufficiency causes meiotic DNA repair defects with accumulation of RAD51 and HSF2BP/BMRE1 on chromosome axes and reduced crossovers in a mouse model. The variant abrogates or diminishes interaction of RAD51B with RAD51C, RAD51, and HELQ. Somatic repair of mitomycin-C-induced aberrations is impaired, and replication fork progression is reduced in patient-derived cells.","method":"Whole-exome sequencing, mouse knockin model, meiotic chromosome spread analysis, co-immunoprecipitation for RAD51B interactions, DNA fiber assay, mitomycin-C sensitivity assay","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse knockin model plus multiple orthogonal mechanistic assays (Co-IP for interaction partners, meiotic spreads, fiber assay, chromosomal aberration repair) in same study","pmids":["35624308"],"is_preprint":false},{"year":2014,"finding":"In mouse embryonic stem cells (mESCs), miR-590 directly targets Acvr2a (Activin receptor type 2a) to regulate the Activin signaling pathway, and Rad51b is a downstream effector of the miR-590/Acvr2a pathway that regulates both single-strand break and double-strand break repair and cell cycle progression, balancing DNA damage repair and rapid proliferation during mESC self-renewal.","method":"miRNA overexpression, siRNA knockdown, luciferase reporter assay, DNA damage repair assay (SSB and DSB), cell cycle analysis, LIF withdrawal","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pathway placement by epistasis with miRNA and receptor, single lab, multiple cellular assays","pmids":["25458897"],"is_preprint":false},{"year":2014,"finding":"siRNA knockdown of RAD51B in breast cancer cell lines increases sensitivity to DNA-damaging agents (cisplatin, hydroxyurea, methyl-methanesulfonate), reduces homologous recombination efficiency, and alters cell cycle checkpoint responses. The influence of RAD51B on the cell cycle checkpoint is independent of its role in HR.","method":"siRNA knockdown, clonogenic survival, HR reporter assay, cell cycle analysis (FACS)","journal":"Breast cancer : basic and clinical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with multiple orthogonal phenotypic readouts, functional separation of HR and cell cycle roles, single lab","pmids":["25368520"],"is_preprint":false},{"year":2025,"finding":"Using yeast 3-hybrid and Co-IP approaches, RAD51B (and other RAD51 paralogs) interact with BRCA2 at two distinct interaction hubs: the BRC repeats and the DNA binding domain. Specifically, BRCA2 interacts with the C-terminal domain (CTD) of RAD51B (not the N-terminal domain). This interaction is dependent on an FxxA motif located on a surface-exposed region of the RAD51B CTD.","method":"Yeast 3-hybrid assay, Co-immunoprecipitation, domain mapping with truncation/point mutants","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast 3-hybrid plus Co-IP with domain mapping, preprint not yet peer-reviewed, single lab","pmids":["bio_10.1101_2024.10.10.617680"],"is_preprint":true},{"year":2025,"finding":"Loss of RAD51B in Brca1-deficient mice leads to development of TNBC-phenotype tumors by repressing ERα expression through recruitment of PRC2 and subsequent H3K27me3 trimethylation at the Esr1 promoter. Mechanistically, RAD51B loss increases cellular ATP levels, suppresses AMPK pathway, and causes dephosphorylation of EZH2 at Thr311, enhancing PRC2 assembly. EZH2 inhibitor combined with tamoxifen reduces TNBC progression.","method":"Sleeping Beauty transposon screen in mice, RAD51B knockout mouse model, ChIP for H3K27me3 at Esr1 promoter, AMPK pathway analysis, EZH2 phosphorylation assay, pharmacological inhibition","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mouse genetic model plus ChIP plus pathway analysis with pharmacological validation, single lab, multiple orthogonal methods","pmids":["41318657"],"is_preprint":false},{"year":1999,"finding":"RAD51B (hREC2) on chromosome 14q23-24 is the preferential translocation partner of HMGIC in uterine leiomyomas via t(12;14)(q15;q24) translocation. The rearrangement causes allelic knockout of a uterine-specific RAD51B isoform, generating RAD51B-HMGIC fusion transcripts. A novel uterine-expressed RAD51B isoform with a putative transmembrane domain-encoding last exon was identified.","method":"FISH, RACE (3' cDNA end amplification), RT-PCR, transcript analysis of tumor tissue","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — FISH, RACE, and RT-PCR demonstrating consistent rearrangement and fusion transcript expression, multiple cases","pmids":["9892177"],"is_preprint":false}],"current_model":"RAD51B is a RAD51 paralog that functions as part of the BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2), whose structure mimics a RAD51 nucleoprotein filament; BCDX2 acts as a recombination mediator by stimulating RAD51 filament nucleation and extension on ssDNA through coupled RAD51B-RAD51C ATPase activity, alleviating RPA competition, and specifically recognizing branched DNA intermediates such as Holliday junctions, thereby promoting homologous recombination-mediated repair of DNA double-strand breaks and protecting replication forks, with nuclear localization directed by an N-terminal KKLK signal and additional roles in centrosome integrity, cell cycle checkpoint control, and interactions with BRCA2 via an FxxA motif in its dynamic C-terminal domain."},"narrative":{"mechanistic_narrative":"RAD51B is a RAD51 paralog that functions as a recombination mediator in homologous recombination (HR)-mediated repair of DNA double-strand breaks and in replication fork protection [PMID:37344587, PMID:10938124]. It is a stable subunit of the BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2), in which RAD51C-RAD51D-XRCC2 structurally mimic three RAD51 protomers within a nucleoprotein filament while RAD51B is conformationally dynamic; BCDX2 stimulates nucleation and extension of RAD51 filaments on ssDNA in reactions dependent on the coupled ATPase activities of RAD51B and RAD51C [PMID:37344587]. The minimal RAD51B-RAD51C heterodimer binds ssDNA and dsDNA, hydrolyzes ATP in a DNA-stimulated manner, and acts as a mediator that alleviates RPA competition for ssDNA to facilitate assembly of the RAD51-ssDNA filament required for strand exchange [PMID:11751636, PMID:12427746]. Both RAD51B alone and the assembled BCDX2 complex preferentially recognize branched DNA intermediates such as synthetic Holliday junctions [PMID:15141025, PMID:12441335]. Loss or haploinsufficiency of RAD51B impairs HR, reduces sister chromatid exchange and damage-induced RAD51 focus formation, sensitizes cells to crosslinking agents, and produces chromosomal aberrations, centrosome fragmentation, and aneuploidy [PMID:10938124, PMID:16778173]; RAD51B additionally contributes to a cell cycle checkpoint function that is separable from its HR role [PMID:25368520]. Nuclear import is directed by an N-terminal KKLK signal acting independently of RAD51C and BRCA2 [PMID:15701685], and RAD51B engages BRCA2 through an FxxA motif in its C-terminal domain [PMID:bio_10.1101_2024.10.10.617680]. A truncating RAD51B variant identified in sisters with primary ovarian insufficiency disrupts interaction with RAD51C, RAD51, and HELQ and causes meiotic DNA repair defects with reduced crossovers, linking RAD51B to a human reproductive disorder [PMID:35624308].","teleology":[{"year":1998,"claim":"Established the first cellular phenotypes for RAD51B by showing its overexpression imposes a G1 delay and UV-induced apoptosis dependent on the intact full-length protein, hinting at a role beyond a passive structural paralog.","evidence":"Stable overexpression in CHO cells with FACS, UV irradiation, and mutagenesis of the Src-site residue and N-terminal truncations","pmids":["9788630"],"confidence":"Medium","gaps":["Overexpression phenotype may not reflect endogenous function","Mechanistic link between the Src-site residue and cell cycle control unresolved"]},{"year":1999,"claim":"Demonstrated RAD51B is an essential developmental gene whose loss is embryonic-lethal but partially p53-dependent, placing it in a proliferation-control pathway intersecting p53.","evidence":"Homozygous knockout in mouse ES cells with timed pregnancy and blastocyst outgrowth, plus p53-null epistasis","pmids":["10567591"],"confidence":"High","gaps":["Molecular basis of lethality not defined","Does not distinguish HR defect from other roles"]},{"year":1999,"claim":"Linked RAD51B to human tumorigenesis by identifying it as the recurrent HMGIC translocation partner in uterine leiomyomas, generating fusion transcripts and disrupting a uterine-specific isoform.","evidence":"FISH, RACE, and RT-PCR on uterine leiomyoma tissue","pmids":["9892177"],"confidence":"Medium","gaps":["Functional consequence of the fusion not established","Relevance of the transmembrane-domain isoform unclear"]},{"year":2000,"claim":"Provided in vivo evidence that RAD51B promotes RAD51 filament assembly during HR, by showing its knockout cripples recombinational repair and damage-induced RAD51 foci.","evidence":"RAD51B knockout in chicken DT40 cells with HRR, SCE, clonogenic survival, and RAD51 focus assays","pmids":["10938124"],"confidence":"High","gaps":["Did not resolve biochemical mechanism of RAD51 loading","Avian system; human stoichiometry not addressed"]},{"year":2000,"claim":"Reported an apparent intrinsic protein kinase activity for RAD51B against cell cycle substrates, offering a candidate biochemical basis for its checkpoint effects.","evidence":"In vitro kinase assay with purified protein on kemptide, MBP, p53, cyclin E, and cdk2","pmids":["10623463"],"confidence":"Medium","gaps":["Not independently replicated","Biological significance and substrate specificity unclear","Possible co-purifying kinase not excluded"]},{"year":2001,"claim":"Defined the core biochemical mediator function by reconstituting the RAD51B-RAD51C heterodimer and showing it relieves RPA competition to enable RAD51 filament assembly and strand exchange.","evidence":"In vitro reconstitution with purified proteins: strand exchange, ATPase, and ssDNA-binding assays; reciprocal Co-IP from human cell lines","pmids":["11751636","11744692"],"confidence":"High","gaps":["Did not define the full BCDX2 assembly","Relative contributions of RAD51B vs RAD51C not separated"]},{"year":2002,"claim":"Characterized the biochemical division of labor within the heterodimer and RAD51B's preference for branched substrates, showing RAD51B binds DNA and hydrolyzes ATP but lacks strand exchange while preferring Holliday junctions.","evidence":"Purified recombinant RAD51B/RAD51C from Sf9 cells with pulldown, DNA-binding, ATPase, and strand-exchange assays; HJ/half-cruciform/dsDNA binding assays","pmids":["12427746","12441335"],"confidence":"High","gaps":["Cellular relevance of HJ binding not directly tested","Structural basis of branched-DNA preference unknown"]},{"year":2004,"claim":"Showed the assembled BCDX2 complex specifically recognizes branched recombination intermediates and catalyzes strand annealing, extending the branched-DNA preference from RAD51B to the full complex.","evidence":"Competitive DNA-binding assay across seven substrate types and strand-annealing assay with purified BCDX2","pmids":["15141025"],"confidence":"High","gaps":["In vivo function on Holliday junctions not demonstrated","Single-lab biochemistry"]},{"year":2005,"claim":"Mapped the determinant of RAD51B nuclear targeting to an N-terminal KKLK NLS acting independently of its partners, establishing how RAD51B reaches its site of action.","evidence":"EGFP-fusion imaging with NLS mutagenesis in RAD51C-deficient and BRCA2-mutant cells","pmids":["15701685"],"confidence":"High","gaps":["Import receptor not identified","Regulation of localization during the cell cycle not addressed"]},{"year":2006,"claim":"Linked RAD51B dosage to genome stability beyond HR, demonstrating that biallelic expression is required for centrosome integrity and euploidy.","evidence":"Gene targeting in human HCT116 and siRNA in HT1080 with SCE, RAD51 foci, centrosome, and karyotype analyses","pmids":["16778173"],"confidence":"High","gaps":["Mechanism connecting RAD51B to centrosome maintenance unknown","Whether centrosome role is BCDX2-dependent unresolved"]},{"year":2009,"claim":"Identified EVL as a RAD51B-interacting recombination factor, with RAD51B enhancing EVL-stimulated RAD51 pairing activity.","evidence":"Pulldown binding, in vitro strand exchange/annealing, and siRNA knockdown with RAD51 foci","pmids":["19329439"],"confidence":"Medium","gaps":["Functional significance of the RAD51B-EVL interaction in cells not established","Single lab"]},{"year":2014,"claim":"Separated RAD51B's checkpoint role from its HR role and placed it downstream of a miR-590/Activin axis governing stem cell self-renewal and proliferation.","evidence":"siRNA knockdown in breast cancer lines with HR reporter, survival, and cell cycle assays; miRNA/luciferase/repair assays in mESCs","pmids":["25368520","25458897"],"confidence":"Medium","gaps":["Molecular basis of the HR-independent checkpoint function unknown","Direct vs indirect regulation by the Activin pathway not resolved"]},{"year":2022,"claim":"Connected RAD51B to a human Mendelian phenotype by showing a truncating variant causes primary ovarian insufficiency through disrupted partner interactions and meiotic repair defects.","evidence":"Whole-exome sequencing, mouse knockin model, meiotic chromosome spreads, Co-IP, DNA fiber, and mitomycin-C assays","pmids":["35624308"],"confidence":"High","gaps":["Whether HELQ interaction is direct not shown","Penetrance and somatic vs germline contributions not fully delineated"]},{"year":2023,"claim":"Resolved the structural logic of BCDX2, showing three subunits mimic a RAD51 filament while RAD51B is dynamic, and that coupled RAD51B-RAD51C ATPase activity drives RAD51 filament nucleation and extension.","evidence":"Cryo-EM, AlphaFold2 modelling, structural proteomics, single-molecule analysis, and ATPase mutagenesis with reconstituted complex","pmids":["37344587"],"confidence":"High","gaps":["Conformational role of the dynamic RAD51B subunit not fully defined","Coupling of ATPase to filament handoff at atomic resolution unresolved"]},{"year":2025,"claim":"Mapped the RAD51B-BRCA2 interface to an FxxA motif in the RAD51B C-terminal domain, defining how the paralog engages the central HR mediator.","evidence":"Yeast 3-hybrid and Co-IP with domain truncation/point mutants (preprint)","pmids":["bio_10.1101_2024.10.10.617680"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Functional consequence of the FxxA-mediated BRCA2 interaction in cells untested"]},{"year":2025,"claim":"Implicated RAD51B loss in a non-HR oncogenic mechanism, whereby it represses ERα via ATP/AMPK-dependent PRC2 recruitment to drive TNBC in a BRCA1-deficient background.","evidence":"Sleeping Beauty transposon screen and RAD51B knockout mice, ChIP for H3K27me3, AMPK/EZH2 phosphorylation analysis, and pharmacological inhibition","pmids":["41318657"],"confidence":"Medium","gaps":["Direct vs indirect role of RAD51B in chromatin regulation unclear","Generalizability beyond the BRCA1-deficient context untested"]},{"year":null,"claim":"How RAD51B's dynamic conformation, branched-DNA recognition, and ATPase coupling are mechanically integrated to control RAD51 filament handoff in vivo, and how its HR-independent roles in checkpoint, centrosome, and chromatin regulation are wired, remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No atomic-resolution model of the RAD51B-to-RAD51 handoff","HR-independent mechanisms (checkpoint, centrosome, PRC2/ERα) molecularly undefined","Reported intrinsic kinase activity unreconciled with the mediator model"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,2,5,6]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,1,2,6]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[1,2,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[7,11,15]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[13]}],"complexes":["BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2)","RAD51B-RAD51C heterodimer"],"partners":["RAD51C","RAD51D","XRCC2","RAD51","BRCA2","EVL","HELQ"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15315","full_name":"DNA repair protein RAD51 homolog 2","aliases":["RAD51 homolog B","Rad51B","RAD51-like protein 1"],"length_aa":384,"mass_kda":42.2,"function":"Involved in the homologous recombination repair (HRR) pathway of double-stranded DNA breaks arising during DNA replication or induced by DNA-damaging agents. May promote the assembly of presynaptic RAD51 nucleoprotein filaments. Binds single-stranded DNA and double-stranded DNA and has DNA-dependent ATPase activity. Part of the RAD51 paralog protein complex BCDX2 which acts in the BRCA1-BRCA2-dependent HR pathway. Upon DNA damage, BCDX2 acts downstream of BRCA2 recruitment and upstream of RAD51 recruitment. BCDX2 binds predominantly to the intersection of the four duplex arms of the Holliday junction and to junction of replication forks. The BCDX2 complex was originally reported to bind single-stranded DNA, single-stranded gaps in duplex DNA and specifically to nicks in duplex DNA. The BCDX2 subcomplex RAD51B:RAD51C exhibits single-stranded DNA-dependent ATPase activity suggesting an involvement in early stages of the HR pathway","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O15315/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAD51B","classification":"Not Classified","n_dependent_lines":155,"n_total_lines":1208,"dependency_fraction":0.12831125827814568},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RAD51B","total_profiled":1310},"omim":[{"mim_id":"611416","title":"TOX HIGH MOBILITY GROUP BOX FAMILY MEMBER 3; TOX3","url":"https://www.omim.org/entry/611416"},{"mim_id":"606769","title":"HELICASE, POLQ-LIKE; HELQ","url":"https://www.omim.org/entry/606769"},{"mim_id":"603075","title":"MACULAR DEGENERATION, AGE-RELATED, 1; ARMD1","url":"https://www.omim.org/entry/603075"},{"mim_id":"602954","title":"RAD51 PARALOG D; RAD51D","url":"https://www.omim.org/entry/602954"},{"mim_id":"602948","title":"RAD51 PARALOG B; RAD51B","url":"https://www.omim.org/entry/602948"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear bodies","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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B","url":"https://pubmed.ncbi.nlm.nih.gov/39011678","citation_count":1,"is_preprint":false},{"pmid":"37858068","id":"PMC_37858068","title":"Identification of a RAD51B enhancer variant for susceptibility and progression to glioma.","date":"2023","source":"Cancer cell international","url":"https://pubmed.ncbi.nlm.nih.gov/37858068","citation_count":1,"is_preprint":false},{"pmid":"41318657","id":"PMC_41318657","title":"RAD51B-EZH2 axis as a potential therapeutic target for TNBC through cell fate conversion.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41318657","citation_count":0,"is_preprint":false},{"pmid":"40196614","id":"PMC_40196614","title":"CRISPR-Cas12a REC2 - NUC interactions drive target-strand cleavage and constrain trans cleavage.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40196614","citation_count":0,"is_preprint":false},{"pmid":"38999967","id":"PMC_38999967","title":"Exudative Age-Related Macular Degeneration: Association between Treatment Efficacy and Single-Nucleotide Variants in RAD51B, TRIB1, COL8A1, COL10A1, IL-9, IL-10, and VEGFA Genes.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38999967","citation_count":0,"is_preprint":false},{"pmid":"41618016","id":"PMC_41618016","title":"Epithelioid leiomyosarcoma harboring HMGA2::RAD51B fusion: expanding the spectrum of RAD51B-rearranged uterine sarcoma.","date":"2026","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/41618016","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.23.644851","title":"CRISPR-Cas12a REC2 – NUC interactions drive target-strand cleavage and constrain trans cleavage","date":"2025-03-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.23.644851","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.22.25338181","title":"A comprehensive genomic framework for identifying genes predisposing to homologous recombination repair deficient breast cancer","date":"2025-10-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.22.25338181","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.10.617680","title":"RAD51 Paralogs and RAD51 Paralog Complexes BCDX2 and CX3 Interact with BRCA2","date":"2024-10-11","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.10.617680","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.20.25320626","title":"Exome Sequencing for Head and Neck Cancer Predisposition Genes","date":"2025-01-22","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.20.25320626","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.08.24310077","title":"Unearthed Novel Molecular Phenotypes and Potential Therapeutic Targets in Esophagogastric Adenocarcinoma","date":"2024-07-08","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.08.24310077","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":42714,"output_tokens":5232,"usd":0.103311,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13630,"output_tokens":5110,"usd":0.09795,"stage2_stop_reason":"end_turn"},"total_usd":0.201261,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structure, AlphaFold2 modelling, and structural proteomics revealed that the BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2) has RAD51C-RAD51D-XRCC2 mimicking three RAD51 protomers aligned within a nucleoprotein filament, while RAD51B is highly dynamic. Biochemical and single-molecule analyses showed that BCDX2 stimulates nucleation and extension of RAD51 filaments on ssDNA in reactions that depend on the coupled ATPase activities of RAD51B and RAD51C, supporting replication fork protection and double-strand break repair.\",\n      \"method\": \"Cryo-EM structure determination, AlphaFold2 modelling, structural proteomics, in vitro biochemical assay, single-molecule analysis, ATPase mutagenesis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus reconstituted biochemical assays plus single-molecule analysis with ATPase mutagenesis in a single rigorous study\",\n      \"pmids\": [\"37344587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RAD51B and RAD51C form a stable heterodimeric complex with ssDNA-binding and ssDNA-stimulated ATPase activities. This Rad51B-Rad51C complex acts as a recombination mediator by alleviating RPA competition with Rad51 for ssDNA binding, facilitating assembly of the Rad51-ssDNA nucleoprotein filament required for DNA strand exchange.\",\n      \"method\": \"In vitro reconstitution of DNA strand exchange, ATPase assay, ssDNA-binding assay, functional interaction assay with purified proteins\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with multiple orthogonal biochemical assays (ATPase, DNA binding, strand exchange) on purified proteins\",\n      \"pmids\": [\"11751636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Purified recombinant RAD51B and RAD51C form a highly stable heterodimer (confirmed by Ni-NTA pulldown), both bind single- and double-stranded DNA with preference for 3'-end-tailed duplexes, and both exhibit DNA-stimulated ATPase activity. RAD51B shows no apparent DNA strand exchange activity, while RAD51C does (via duplex destabilization). The heterodimer shows enhanced DNA binding compared to individual proteins.\",\n      \"method\": \"Baculovirus expression and purification from Sf9 cells, Ni-NTA pulldown, DNA-binding assay, DNA-stimulated ATPase assay, strand exchange assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified recombinant proteins, multiple orthogonal assays (pulldown, DNA binding, ATPase, strand exchange)\",\n      \"pmids\": [\"12427746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RAD51B and RAD51C form an endogenous heterocomplex in human cells (HeLa, MCF10A, MCF7) confirmed by co-immunoprecipitation. RAD51C is central to a larger multiprotein complex with RAD51B, RAD51D, XRCC2, and XRCC3 that is exclusive of RAD51. The RAD51B/RAD51C complex was also isolated from insect cells by immunoaffinity chromatography.\",\n      \"method\": \"Co-immunoprecipitation from human cell lines, immunoaffinity chromatography from insect cells co-expressing recombinant proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP confirmed in multiple human cell lines plus independent purification from insect cells\",\n      \"pmids\": [\"11744692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"RAD51B knockout in chicken DT40 cells impairs homologous recombinational repair (reduced targeted integration, sister chromatid exchange, and intragenic recombination), causes spontaneous chromosomal aberrations, sensitizes cells to cisplatin and mitomycin C, and greatly reduces damage-induced RAD51 nuclear focus formation, indicating RAD51B promotes assembly of RAD51 nucleoprotein filaments during HRR.\",\n      \"method\": \"Gene knockout by homologous recombination in DT40 cells, targeted integration assay, sister chromatid exchange assay, clonogenic survival assay, immunofluorescence for RAD51 foci\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple orthogonal phenotypic readouts (HRR assays, SCE, RAD51 foci), replicated phenotype consistent across assays\",\n      \"pmids\": [\"10938124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The human BCDX2 complex (RAD51B, RAD51C, RAD51D, XRCC2) preferentially binds branched DNA structures (Y-shaped DNA and synthetic Holliday junctions) over linear ssDNA, dsDNA, or tailed duplexes, and catalyzes strand annealing between a long linear ssDNA and its complementary circular ssDNA.\",\n      \"method\": \"Competitive DNA-binding assay with seven DNA substrate types, strand-annealing assay with purified BCDX2 complex\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified complex, multiple DNA substrate competition assays, single lab\",\n      \"pmids\": [\"15141025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Purified human RAD51B protein binds ssDNA and dsDNA in the presence of ATP and Mg2+ or Mn2+, exhibits DNA-dependent ATPase activity, and specifically binds synthetic Holliday junctions over half-cruciform or dsDNA substrates, suggesting a specific role in Holliday junction processing during homologous recombinational repair.\",\n      \"method\": \"Protein purification, DNA-binding assay with synthetic Holliday junction, half-cruciform, and dsDNA substrates; ATPase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified RAD51B, multiple DNA substrate binding assays and ATPase measurement, single lab\",\n      \"pmids\": [\"12441335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Haploinsufficiency of RAD51B in human HCT116 cells (via gene targeting) causes mild DNA damage hypersensitivity, reduced sister chromatid exchange, impaired RAD51 focus formation, increased chromosome aberrations, centrosome fragmentation, and aneuploidy. siRNA knockdown of RAD51B in HT1080 cells also causes centrosome fragmentation, demonstrating that biallelic RAD51B expression is required for centrosome integrity and chromosome stability.\",\n      \"method\": \"Gene targeting in human HCT116 cells, siRNA knockdown in HT1080 cells, clonogenic survival, SCE assay, immunofluorescence for RAD51 foci and centrosomes, karyotyping\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — haploinsufficiency by gene targeting plus siRNA knockdown, multiple orthogonal phenotypic readouts including centrosome fragmentation and aneuploidy\",\n      \"pmids\": [\"16778173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RAD51B nuclear localization is mediated by an N-terminal KKLK motif (amino acids 4-7) that functions as a nuclear localization signal. Mutation of KKLK results in cytoplasmic retention of EGFP-RAD51B. Nuclear localization of RAD51B is independent of its direct binding partner RAD51C (shown in irs3 mutant cells deficient in RAD51C) and independent of BRCA2 (shown in CAPAN-1 cells).\",\n      \"method\": \"EGFP-fusion live imaging, site-directed mutagenesis of NLS, immunofluorescence in RAD51C-deficient and BRCA2-mutant cell lines\",\n      \"journal\": \"Mutagenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by EGFP fusion + NLS mutagenesis + functional validation in RAD51C-deficient and BRCA2-mutant cells, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"15701685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human EVL (Ena/VASP-like) protein physically binds to both RAD51 and RAD51B (pulldown/binding assay), stimulates RAD51-mediated homologous pairing and strand exchange in vitro, promotes ssDNA annealing alone, and this recombination activity is further enhanced by RAD51B. EVL knockdown impairs RAD51 assembly onto damaged DNA after ionizing radiation or mitomycin C.\",\n      \"method\": \"Protein-binding assay (pulldown), in vitro strand exchange and DNA annealing assay, siRNA knockdown with immunofluorescence for RAD51 foci\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding and functional assays plus cellular KD, single lab, two orthogonal methods\",\n      \"pmids\": [\"19329439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Homozygous disruption of muREC2/RAD51L1 in mice causes early embryonic lethality (growth retardation by E5.5, resorption by E8.5), indicating an essential role in early development. Embryonic lethality is partially rescued in a p53-null background, placing muREC2/RAD51L1 in a pathway that intersects with p53 in controlling cell proliferation.\",\n      \"method\": \"Homologous recombination knockout in embryonic stem cells, timed pregnancy studies, blastocyst outgrowth assay, p53-null background epistasis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with developmental phenotype plus genetic epistasis with p53, replicated in multiple experimental contexts\",\n      \"pmids\": [\"10567591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Overexpression of wild-type human REC2/RAD51B in CHO cells causes G1 cell cycle delay and UV-induced apoptosis. A point mutation at residue 163 (in the putative Src phosphorylation site) or N-terminal truncation (first 100 amino acids only) abolishes both the G1 delay and UV-induced apoptosis, indicating these functional effects require an intact full-length protein including the Src-site domain.\",\n      \"method\": \"Stable transfection, FACS cell cycle analysis, UV irradiation, mutagenesis of Src-site residue and truncation constructs\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable overexpression with functional mutagenesis and multiple readouts (cell cycle, apoptosis), single lab\",\n      \"pmids\": [\"9788630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human REC2/RAD51B (HsRec2/Rad51L1) exhibits protein kinase activity, phosphorylating the artificial substrate kemptide (serine-containing), myelin basic protein, p53, cyclin E, and cdk2, but not a tyrosine-only peptide substrate, suggesting it can regulate cell cycle proteins through serine/threonine phosphorylation.\",\n      \"method\": \"In vitro kinase assay with purified HsRec2/Rad51L1 and multiple peptide/protein substrates\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro kinase assay with purified protein and multiple substrates, single lab, not independently replicated; biological significance unclear\",\n      \"pmids\": [\"10623463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A truncating variant RAD51B c.92delT (leading to reinitiation at Met64) identified in sisters with primary ovarian insufficiency causes meiotic DNA repair defects with accumulation of RAD51 and HSF2BP/BMRE1 on chromosome axes and reduced crossovers in a mouse model. The variant abrogates or diminishes interaction of RAD51B with RAD51C, RAD51, and HELQ. Somatic repair of mitomycin-C-induced aberrations is impaired, and replication fork progression is reduced in patient-derived cells.\",\n      \"method\": \"Whole-exome sequencing, mouse knockin model, meiotic chromosome spread analysis, co-immunoprecipitation for RAD51B interactions, DNA fiber assay, mitomycin-C sensitivity assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse knockin model plus multiple orthogonal mechanistic assays (Co-IP for interaction partners, meiotic spreads, fiber assay, chromosomal aberration repair) in same study\",\n      \"pmids\": [\"35624308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In mouse embryonic stem cells (mESCs), miR-590 directly targets Acvr2a (Activin receptor type 2a) to regulate the Activin signaling pathway, and Rad51b is a downstream effector of the miR-590/Acvr2a pathway that regulates both single-strand break and double-strand break repair and cell cycle progression, balancing DNA damage repair and rapid proliferation during mESC self-renewal.\",\n      \"method\": \"miRNA overexpression, siRNA knockdown, luciferase reporter assay, DNA damage repair assay (SSB and DSB), cell cycle analysis, LIF withdrawal\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pathway placement by epistasis with miRNA and receptor, single lab, multiple cellular assays\",\n      \"pmids\": [\"25458897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"siRNA knockdown of RAD51B in breast cancer cell lines increases sensitivity to DNA-damaging agents (cisplatin, hydroxyurea, methyl-methanesulfonate), reduces homologous recombination efficiency, and alters cell cycle checkpoint responses. The influence of RAD51B on the cell cycle checkpoint is independent of its role in HR.\",\n      \"method\": \"siRNA knockdown, clonogenic survival, HR reporter assay, cell cycle analysis (FACS)\",\n      \"journal\": \"Breast cancer : basic and clinical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with multiple orthogonal phenotypic readouts, functional separation of HR and cell cycle roles, single lab\",\n      \"pmids\": [\"25368520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Using yeast 3-hybrid and Co-IP approaches, RAD51B (and other RAD51 paralogs) interact with BRCA2 at two distinct interaction hubs: the BRC repeats and the DNA binding domain. Specifically, BRCA2 interacts with the C-terminal domain (CTD) of RAD51B (not the N-terminal domain). This interaction is dependent on an FxxA motif located on a surface-exposed region of the RAD51B CTD.\",\n      \"method\": \"Yeast 3-hybrid assay, Co-immunoprecipitation, domain mapping with truncation/point mutants\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast 3-hybrid plus Co-IP with domain mapping, preprint not yet peer-reviewed, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617680\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of RAD51B in Brca1-deficient mice leads to development of TNBC-phenotype tumors by repressing ERα expression through recruitment of PRC2 and subsequent H3K27me3 trimethylation at the Esr1 promoter. Mechanistically, RAD51B loss increases cellular ATP levels, suppresses AMPK pathway, and causes dephosphorylation of EZH2 at Thr311, enhancing PRC2 assembly. EZH2 inhibitor combined with tamoxifen reduces TNBC progression.\",\n      \"method\": \"Sleeping Beauty transposon screen in mice, RAD51B knockout mouse model, ChIP for H3K27me3 at Esr1 promoter, AMPK pathway analysis, EZH2 phosphorylation assay, pharmacological inhibition\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mouse genetic model plus ChIP plus pathway analysis with pharmacological validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41318657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RAD51B (hREC2) on chromosome 14q23-24 is the preferential translocation partner of HMGIC in uterine leiomyomas via t(12;14)(q15;q24) translocation. The rearrangement causes allelic knockout of a uterine-specific RAD51B isoform, generating RAD51B-HMGIC fusion transcripts. A novel uterine-expressed RAD51B isoform with a putative transmembrane domain-encoding last exon was identified.\",\n      \"method\": \"FISH, RACE (3' cDNA end amplification), RT-PCR, transcript analysis of tumor tissue\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — FISH, RACE, and RT-PCR demonstrating consistent rearrangement and fusion transcript expression, multiple cases\",\n      \"pmids\": [\"9892177\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAD51B is a RAD51 paralog that functions as part of the BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2), whose structure mimics a RAD51 nucleoprotein filament; BCDX2 acts as a recombination mediator by stimulating RAD51 filament nucleation and extension on ssDNA through coupled RAD51B-RAD51C ATPase activity, alleviating RPA competition, and specifically recognizing branched DNA intermediates such as Holliday junctions, thereby promoting homologous recombination-mediated repair of DNA double-strand breaks and protecting replication forks, with nuclear localization directed by an N-terminal KKLK signal and additional roles in centrosome integrity, cell cycle checkpoint control, and interactions with BRCA2 via an FxxA motif in its dynamic C-terminal domain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAD51B is a RAD51 paralog that functions as a recombination mediator in homologous recombination (HR)-mediated repair of DNA double-strand breaks and in replication fork protection [#0, #4]. It is a stable subunit of the BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2), in which RAD51C-RAD51D-XRCC2 structurally mimic three RAD51 protomers within a nucleoprotein filament while RAD51B is conformationally dynamic; BCDX2 stimulates nucleation and extension of RAD51 filaments on ssDNA in reactions dependent on the coupled ATPase activities of RAD51B and RAD51C [#0]. The minimal RAD51B-RAD51C heterodimer binds ssDNA and dsDNA, hydrolyzes ATP in a DNA-stimulated manner, and acts as a mediator that alleviates RPA competition for ssDNA to facilitate assembly of the RAD51-ssDNA filament required for strand exchange [#1, #2]. Both RAD51B alone and the assembled BCDX2 complex preferentially recognize branched DNA intermediates such as synthetic Holliday junctions [#5, #6]. Loss or haploinsufficiency of RAD51B impairs HR, reduces sister chromatid exchange and damage-induced RAD51 focus formation, sensitizes cells to crosslinking agents, and produces chromosomal aberrations, centrosome fragmentation, and aneuploidy [#4, #7]; RAD51B additionally contributes to a cell cycle checkpoint function that is separable from its HR role [#15]. Nuclear import is directed by an N-terminal KKLK signal acting independently of RAD51C and BRCA2 [#8], and RAD51B engages BRCA2 through an FxxA motif in its C-terminal domain [#16]. A truncating RAD51B variant identified in sisters with primary ovarian insufficiency disrupts interaction with RAD51C, RAD51, and HELQ and causes meiotic DNA repair defects with reduced crossovers, linking RAD51B to a human reproductive disorder [#13].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the first cellular phenotypes for RAD51B by showing its overexpression imposes a G1 delay and UV-induced apoptosis dependent on the intact full-length protein, hinting at a role beyond a passive structural paralog.\",\n      \"evidence\": \"Stable overexpression in CHO cells with FACS, UV irradiation, and mutagenesis of the Src-site residue and N-terminal truncations\",\n      \"pmids\": [\"9788630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression phenotype may not reflect endogenous function\", \"Mechanistic link between the Src-site residue and cell cycle control unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated RAD51B is an essential developmental gene whose loss is embryonic-lethal but partially p53-dependent, placing it in a proliferation-control pathway intersecting p53.\",\n      \"evidence\": \"Homozygous knockout in mouse ES cells with timed pregnancy and blastocyst outgrowth, plus p53-null epistasis\",\n      \"pmids\": [\"10567591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of lethality not defined\", \"Does not distinguish HR defect from other roles\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Linked RAD51B to human tumorigenesis by identifying it as the recurrent HMGIC translocation partner in uterine leiomyomas, generating fusion transcripts and disrupting a uterine-specific isoform.\",\n      \"evidence\": \"FISH, RACE, and RT-PCR on uterine leiomyoma tissue\",\n      \"pmids\": [\"9892177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the fusion not established\", \"Relevance of the transmembrane-domain isoform unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Provided in vivo evidence that RAD51B promotes RAD51 filament assembly during HR, by showing its knockout cripples recombinational repair and damage-induced RAD51 foci.\",\n      \"evidence\": \"RAD51B knockout in chicken DT40 cells with HRR, SCE, clonogenic survival, and RAD51 focus assays\",\n      \"pmids\": [\"10938124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve biochemical mechanism of RAD51 loading\", \"Avian system; human stoichiometry not addressed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Reported an apparent intrinsic protein kinase activity for RAD51B against cell cycle substrates, offering a candidate biochemical basis for its checkpoint effects.\",\n      \"evidence\": \"In vitro kinase assay with purified protein on kemptide, MBP, p53, cyclin E, and cdk2\",\n      \"pmids\": [\"10623463\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Not independently replicated\", \"Biological significance and substrate specificity unclear\", \"Possible co-purifying kinase not excluded\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the core biochemical mediator function by reconstituting the RAD51B-RAD51C heterodimer and showing it relieves RPA competition to enable RAD51 filament assembly and strand exchange.\",\n      \"evidence\": \"In vitro reconstitution with purified proteins: strand exchange, ATPase, and ssDNA-binding assays; reciprocal Co-IP from human cell lines\",\n      \"pmids\": [\"11751636\", \"11744692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the full BCDX2 assembly\", \"Relative contributions of RAD51B vs RAD51C not separated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Characterized the biochemical division of labor within the heterodimer and RAD51B's preference for branched substrates, showing RAD51B binds DNA and hydrolyzes ATP but lacks strand exchange while preferring Holliday junctions.\",\n      \"evidence\": \"Purified recombinant RAD51B/RAD51C from Sf9 cells with pulldown, DNA-binding, ATPase, and strand-exchange assays; HJ/half-cruciform/dsDNA binding assays\",\n      \"pmids\": [\"12427746\", \"12441335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular relevance of HJ binding not directly tested\", \"Structural basis of branched-DNA preference unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed the assembled BCDX2 complex specifically recognizes branched recombination intermediates and catalyzes strand annealing, extending the branched-DNA preference from RAD51B to the full complex.\",\n      \"evidence\": \"Competitive DNA-binding assay across seven substrate types and strand-annealing assay with purified BCDX2\",\n      \"pmids\": [\"15141025\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo function on Holliday junctions not demonstrated\", \"Single-lab biochemistry\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapped the determinant of RAD51B nuclear targeting to an N-terminal KKLK NLS acting independently of its partners, establishing how RAD51B reaches its site of action.\",\n      \"evidence\": \"EGFP-fusion imaging with NLS mutagenesis in RAD51C-deficient and BRCA2-mutant cells\",\n      \"pmids\": [\"15701685\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Import receptor not identified\", \"Regulation of localization during the cell cycle not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked RAD51B dosage to genome stability beyond HR, demonstrating that biallelic expression is required for centrosome integrity and euploidy.\",\n      \"evidence\": \"Gene targeting in human HCT116 and siRNA in HT1080 with SCE, RAD51 foci, centrosome, and karyotype analyses\",\n      \"pmids\": [\"16778173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting RAD51B to centrosome maintenance unknown\", \"Whether centrosome role is BCDX2-dependent unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified EVL as a RAD51B-interacting recombination factor, with RAD51B enhancing EVL-stimulated RAD51 pairing activity.\",\n      \"evidence\": \"Pulldown binding, in vitro strand exchange/annealing, and siRNA knockdown with RAD51 foci\",\n      \"pmids\": [\"19329439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of the RAD51B-EVL interaction in cells not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Separated RAD51B's checkpoint role from its HR role and placed it downstream of a miR-590/Activin axis governing stem cell self-renewal and proliferation.\",\n      \"evidence\": \"siRNA knockdown in breast cancer lines with HR reporter, survival, and cell cycle assays; miRNA/luciferase/repair assays in mESCs\",\n      \"pmids\": [\"25368520\", \"25458897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the HR-independent checkpoint function unknown\", \"Direct vs indirect regulation by the Activin pathway not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected RAD51B to a human Mendelian phenotype by showing a truncating variant causes primary ovarian insufficiency through disrupted partner interactions and meiotic repair defects.\",\n      \"evidence\": \"Whole-exome sequencing, mouse knockin model, meiotic chromosome spreads, Co-IP, DNA fiber, and mitomycin-C assays\",\n      \"pmids\": [\"35624308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HELQ interaction is direct not shown\", \"Penetrance and somatic vs germline contributions not fully delineated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolved the structural logic of BCDX2, showing three subunits mimic a RAD51 filament while RAD51B is dynamic, and that coupled RAD51B-RAD51C ATPase activity drives RAD51 filament nucleation and extension.\",\n      \"evidence\": \"Cryo-EM, AlphaFold2 modelling, structural proteomics, single-molecule analysis, and ATPase mutagenesis with reconstituted complex\",\n      \"pmids\": [\"37344587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational role of the dynamic RAD51B subunit not fully defined\", \"Coupling of ATPase to filament handoff at atomic resolution unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mapped the RAD51B-BRCA2 interface to an FxxA motif in the RAD51B C-terminal domain, defining how the paralog engages the central HR mediator.\",\n      \"evidence\": \"Yeast 3-hybrid and Co-IP with domain truncation/point mutants (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617680\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Functional consequence of the FxxA-mediated BRCA2 interaction in cells untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated RAD51B loss in a non-HR oncogenic mechanism, whereby it represses ERα via ATP/AMPK-dependent PRC2 recruitment to drive TNBC in a BRCA1-deficient background.\",\n      \"evidence\": \"Sleeping Beauty transposon screen and RAD51B knockout mice, ChIP for H3K27me3, AMPK/EZH2 phosphorylation analysis, and pharmacological inhibition\",\n      \"pmids\": [\"41318657\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect role of RAD51B in chromatin regulation unclear\", \"Generalizability beyond the BRCA1-deficient context untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RAD51B's dynamic conformation, branched-DNA recognition, and ATPase coupling are mechanically integrated to control RAD51 filament handoff in vivo, and how its HR-independent roles in checkpoint, centrosome, and chromatin regulation are wired, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No atomic-resolution model of the RAD51B-to-RAD51 handoff\", \"HR-independent mechanisms (checkpoint, centrosome, PRC2/ERα) molecularly undefined\", \"Reported intrinsic kinase activity unreconciled with the mediator model\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 2, 5, 6]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 1, 2, 6]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [1, 2, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [7, 11, 15]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"complexes\": [\"BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2)\", \"RAD51B-RAD51C heterodimer\"],\n    \"partners\": [\"RAD51C\", \"RAD51D\", \"XRCC2\", \"RAD51\", \"BRCA2\", \"EVL\", \"HELQ\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}