{"gene":"RAD51D","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2000,"finding":"RAD51D (RAD51L3) possesses single-stranded DNA binding activity and DNA-stimulated ATPase activity, consistent with Walker box motifs in its sequence, and forms a direct heterodimeric complex with XRCC2 in human cells, as demonstrated by purification of the recombinant protein and co-immunoprecipitation.","method":"Protein purification, in vitro ATPase assay, ssDNA binding assay, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted purified protein with in vitro enzymatic assay plus direct binding assay; replicated by multiple subsequent studies","pmids":["10871607"],"is_preprint":false},{"year":2002,"finding":"The purified human XRCC2·RAD51D complex catalyzes homologous pairing between single-stranded and double-stranded DNA, forms multimeric ring structures in the absence of DNA, and assembles into filamentous structures on ssDNA, similar to other homologous pairing proteins.","method":"Recombinant protein co-expression and purification in E. coli, in vitro homologous pairing assay, electron microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified proteins, multiple orthogonal methods (biochemical assay + EM)","pmids":["11834724"],"is_preprint":false},{"year":2003,"finding":"BLM helicase makes a direct physical interaction with RAD51D (RAD51L3) through the N-terminal domain of BLM, and the RAD51D-XRCC2 complex stimulates BLM to disrupt synthetic 4-way (Holliday junction) structures in a manner dependent on direct physical association between BLM and RAD51D.","method":"Protein purification, in vitro Holliday junction disruption assay, co-immunoprecipitation, domain-mapping with BLM truncation mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple orthogonal methods (binding + functional assay + mutagenesis via truncation)","pmids":["12975363"],"is_preprint":false},{"year":2004,"finding":"The RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2) complex preferentially binds to branched DNA substrates (Y-shaped DNA and synthetic Holliday junctions) over linear ssDNA or dsDNA, and catalyzes strand-annealing between long complementary ssDNA molecules.","method":"Competitive DNA-binding assays with purified BCDX2 complex using seven DNA substrate types, strand-annealing assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified reconstituted complex, multiple orthogonal biochemical assays","pmids":["15141025"],"is_preprint":false},{"year":2004,"finding":"RAD51D localizes to telomeres in both meiotic and somatic cells; Rad51d-deficient mouse embryonic fibroblasts exhibit telomeric DNA repeat shortening, elevated chromosomal end-to-end fusions, and siRNA-mediated depletion in telomerase-negative human cells also causes telomere erosion and chromosome fusion, establishing a dual role for RAD51D in DNA double-strand break repair and telomere maintenance.","method":"Immunofluorescence labeling, electron microscopy, chromatin immunoprecipitation, siRNA knockdown, cytogenetic analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal localization and functional methods (IF, EM, ChIP, KO mouse, siRNA), replicated across cell types","pmids":["15109494"],"is_preprint":false},{"year":2005,"finding":"Rad51d-deficient mouse embryonic fibroblasts (in p53-null background) are sensitive to DNA-damaging agents, exhibit extensive chromosome instability (aneuploidy, fragments, complex rearrangements), increased centrosome fragmentation, reduced radiation-induced RAD51 focus formation, and fail to increase sister chromatid exchange in response to mitomycin C, demonstrating RAD51D is required for RAD51 recruitment and homologous recombination repair.","method":"Knockout mouse model, cell survival assays, cytogenetic analysis, immunofluorescence for RAD51 foci, sister chromatid exchange assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with multiple defined phenotypic readouts including RAD51 foci formation as direct mechanistic endpoint","pmids":["15781618"],"is_preprint":false},{"year":2005,"finding":"The Walker A (ATP binding) motif of RAD51D is required for efficient homologous recombination repair of DNA interstrand crosslinks; Walker A mutations K113R and K113A reduce repair capacity by 83–96% and diminish interaction with RAD51C (8-fold reduction) while retaining interaction with XRCC2.","method":"Site-directed mutagenesis, complementation in Rad51d-deficient MEFs, yeast two-hybrid analysis","journal":"Mutagenesis","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with functional complementation and protein interaction assays in single lab, multiple orthogonal methods","pmids":["16236763"],"is_preprint":false},{"year":2006,"finding":"The Walker B ATPase motif of RAD51D is required for interactions with XRCC2 and RAD51C and for efficient homologous recombinational repair, whereas the Walker A motif is not required for these interactions or complementation of crosslink sensitivity; ATPase sites are proposed to form in a bipartite manner between RAD51D and other paralogs.","method":"ATPase motif mutagenesis, complementation in rad51d knockout CHO cells, yeast two- and three-hybrid assays, co-immunoprecipitation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with multiple orthogonal interaction and functional assays in single lab","pmids":["16717288"],"is_preprint":false},{"year":2006,"finding":"RAD51D-deficient CHO cells exhibit a 12-fold increased rate of hprt mutation and 4–10-fold increased gene amplification at dhfr and CAD loci, as well as elevated spontaneous chromatid breaks, demonstrating that RAD51D-mediated homologous recombination acts in an error-free manner to suppress multiple classes of genetic alterations.","method":"Rad51d knockout CHO cells, hprt mutation assay, gene amplification assay, cytogenetic analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple quantitative mutational readouts, orthogonal assays in single lab","pmids":["16522646"],"is_preprint":false},{"year":2009,"finding":"SFPQ/PSF interacts directly with RAD51D (and also RAD51C and XRCC2) as identified by proteomics; depletion of both SFPQ and RAD51D results in a synthetic lethal relationship. SFPQ deficiency alone leads to sister chromatid cohesion defects and chromosome instability, and mediates homology-directed DNA repair.","method":"Proteomics screen, direct protein interaction assay, siRNA knockdown, cell viability assay, chromosome instability analysis, sister chromatid cohesion assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction confirmed, multiple functional assays, single lab","pmids":["20813759"],"is_preprint":false},{"year":2009,"finding":"The RAD51D E233G variant decreases interaction with RAD51C by ~2-fold while maintaining normal XRCC2 interaction, increases cellular resistance to multiple DNA-damaging agents, reduces anaphase bridge index, and increases proliferation. Molecular modeling suggests glutamic acid-233 forms a salt bridge with lysine-23 in the RAD51D N-terminal domain that is disrupted by the glycine substitution.","method":"Yeast two-hybrid, complementation in Rad51d-deficient MEFs, cell survival assays, molecular modeling","journal":"Pharmacogenetics and genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus cellular complementation, single lab, multiple functional assays","pmids":["19033885"],"is_preprint":false},{"year":2010,"finding":"RAD51D protects cells from MLH1-dependent cytotoxicity induced by O6-methylguanine: Rad51d-deficient cells are 5.3-fold sensitive to MNNG, with G2/M arrest and apoptosis; loss of Mlh1 alleviates this sensitivity, demonstrating that RAD51D-mediated homologous recombination acts downstream of MMR to resolve recombinogenic intermediates created by MMR recognition of O6-meG:T mismatches.","method":"Genetic epistasis using Rad51d/Mlh1/Trp53 triple-knockout MEFs, MNNG sensitivity assay, γ-H2AX measurement, cell cycle analysis, apoptosis assay","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis with double/triple KO system, multiple orthogonal readouts establishing pathway order","pmids":["20133210"],"is_preprint":false},{"year":2010,"finding":"The NMR solution structure of the human RAD51D N-terminal domain (residues 1-83) consists of four short helices flanked by N- and C-terminal tails, with the N-terminal tail fixed by hydrophobic interactions (Leu4/Thr27, Leu4/Val28, Val6/Ile17). The domain preferentially binds ssDNA over dsDNA and does not bind mobile Holliday junctions, with NMR titration identifying positively charged and hydrophobic surface residues for ssDNA binding.","method":"NMR structure determination, EMSA (ssDNA vs dsDNA binding), NMR titration","journal":"The international journal of biochemistry & cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure plus functional validation by EMSA and NMR titration, single lab","pmids":["21111057"],"is_preprint":false},{"year":2011,"finding":"RAD51D-deficient cells are extremely sensitive to 6-thioguanine; this sensitivity is almost completely rescued by deletion of Mlh1, establishing that RAD51D-mediated homologous recombination acts downstream of MLH1-dependent mismatch repair to resolve 6-thioG-induced recombinogenic lesions. Rad51d-deficient cells also show markedly increased triradial and quadriradial chromosomal aberrations after 6-thioG treatment.","method":"Genetic epistasis with Rad51d/Mlh1 double-knockout cells, 6-thioG sensitivity assay, cytogenetic analysis","journal":"Molecular cancer research : MCR","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistasis using double KO, multiple readouts, mechanistic pathway placement","pmids":["21205838"],"is_preprint":false},{"year":2016,"finding":"RNF138 E3 ubiquitin ligase directly interacts with and ubiquitinates RAD51D; RNF138 depletion increases RAD51D protein stability, reduces RAD51 focus formation, and causes sensitivity to DNA-damaging agents and chromosome instability. The RNF138 RING finger domain is required for RAD51D ubiquitination, and RNF138 presence enhances the RAD51D-XRCC2 interaction.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA depletion, RAD51 foci assay, RING domain mutagenesis, yeast three-hybrid","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct ubiquitination assay with mutagenesis plus multiple orthogonal functional assays, single lab","pmids":["27161866"],"is_preprint":false},{"year":2016,"finding":"Ubiquitylation of Rad51D by RNF138 promotes homologous recombination repair: RNF138 is recruited to DNA damage sites via its zinc finger domains, is phosphorylated by ATM at Ser124 (though this phosphorylation is dispensable for recruitment), and directly interacts with RAD51D; RNF138 depletion delays and destabilizes RAD51D recruitment to damage sites and reduces HR efficiency.","method":"Live cell imaging, co-immunoprecipitation, siRNA depletion, HR reporter assay, comet assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional and localization assays, single lab; partially overlapping findings with PMID 27161866","pmids":["27195665"],"is_preprint":false},{"year":2017,"finding":"The RAD51D missense variant p.S207L disrupts the RAD51D-XRCC2 protein-protein interaction and impairs homologous recombination, conferring PARP inhibitor sensitivity; this highlights the RAD51D-XRCC2 interaction as critical for HR function and tumor suppression.","method":"Case-control genotyping, yeast two-hybrid interaction assay, HR assay, PARP inhibitor sensitivity assay in patient-derived cells","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional characterization with interaction assay + HR assay + drug sensitivity, single lab","pmids":["28646019"],"is_preprint":false},{"year":2017,"finding":"RAD51D deficiency shifts DSB repair from homologous recombination-mediated gene conversion toward single-strand annealing (SSA) and end-joining pathways, resulting in an exceptionally high frequency of large chromosomal deletions surrounding site-specific DSBs; deletions near the break are due to NHEJ while larger deletions use SSA.","method":"HR reporter assay at endogenous Aprt locus, I-SceI-induced DSBs, loss-of-function RAD51D-deficient CHO cells, deletion mapping","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO cells, direct quantitative measurement of competing repair pathways with pathway-specific readouts","pmids":["27924006"],"is_preprint":false},{"year":2017,"finding":"RAD51D is required for maintaining telomeric 3' overhangs; Rad51d-deficient cells show increased γ-H2AX localization at telomeres following 6-thioguanine treatment and undergo mitotic catastrophe (failed division and restitution) leading to multinucleated cell formation.","method":"γ-H2AX foci assay with telomere co-localization, live-cell imaging of mitotic catastrophe, Rad51d-deficient cells","journal":"Environmental and molecular mutagenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization + functional imaging, single lab","pmids":["28945288"],"is_preprint":false},{"year":2019,"finding":"RAD51D isoform 1 is the functional isoform for HR; isoform 4 (large N-terminal deletion including Walker A motif) and isoform 6 (alternate N-terminal exon) are non-functional. Cancer-associated mutations G96C and G107V near/within the Walker A motif independently disrupt RAD51D interaction with XRCC2, reduce HR efficiency in a sister chromatid recombination reporter assay, and the RAD51D-XRCC2 interaction is required for DSB repair.","method":"Yeast two-hybrid and three-hybrid, co-immunoprecipitation, sister chromatid recombination HR reporter assay in RAD51D knockout U2OS cells, functional complementation","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis of cancer variants, multiple orthogonal interaction and functional assays, KO cell complementation","pmids":["30836272"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM, AlphaFold2 modeling, and structural proteomics reveal that in the BCDX2 complex, RAD51C-RAD51D-XRCC2 mimics three RAD51 protomers aligned within a nucleoprotein filament while RAD51B is highly dynamic. BCDX2 stimulates nucleation and extension of RAD51 filaments on ssDNA in reactions dependent on the coupled ATPase activities of RAD51B and RAD51C, establishing that BCDX2 orchestrates RAD51 assembly for replication fork protection and double-strand break repair.","method":"Cryo-electron microscopy, AlphaFold2 structural modeling, structural proteomics, single-molecule analysis, biochemical RAD51 filament assembly assays, ATPase assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus biochemical reconstitution plus single-molecule assays, multiple orthogonal methods in single high-rigor study","pmids":["37344587"],"is_preprint":false},{"year":2022,"finding":"YTHDF3 mediates translation of RAD51D mRNA in an m6A-dependent manner downstream of HNF1α transcriptional upregulation of YTHDF3; HNF1α positively regulates RAD51D at the protein level but not mRNA level, and this HNF1α/YTHDF3/RAD51D axis promotes radioresistance in cervical cancer cells.","method":"Depletion/overexpression of HNF1α and YTHDF3, western blotting (protein vs. mRNA level distinction), in vitro and in vivo irradiation assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection of translational regulation axis, multiple assays in single lab","pmids":["36380687"],"is_preprint":false},{"year":2026,"finding":"Cryo-EM reveals two distinct heterotetrameric RAD51 paralog complexes: RAD51B-RAD51C-RAD51D-XRCC2 (RAD51B complex) and XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex). The RAD51B complex promotes dynamic ATP hydrolysis-dependent RAD51 filament assembly, while the XRCC3 complex stably caps the 5' termini of RAD51 filaments to promote homologous pairing, with RAD51C-RAD51D-XRCC2 shared between both complexes.","method":"Cryo-electron microscopy, biochemical filament assembly assays, single-molecule visualization","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structural determination with biochemical and single-molecule validation, multiple orthogonal methods","pmids":["41196948"],"is_preprint":false},{"year":2026,"finding":"A high-throughput multiplex assay of 6,888 RAD51D coding variants identifies that variants in the DNA-binding or ATPase core most severely compromise HR. The RAD51D-RAD51C interface within the BCDX2 complex is essential for regulating ATPase activity, and paradoxically, the primary function of RAD51D appears to be slowing the ATPase activity of BCDX2 to allow sufficient time for RAD51 filament assembly.","method":"Multiplex assay of variant effect (saturation genome editing), orthogonal HR and biochemical assays across 70 clinical variants, ATPase activity assays","journal":"bioRxiv : the preprint server for biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — high-throughput functional screen validated by orthogonal biochemical assays, single lab, preprint","pmids":["41542474"],"is_preprint":true},{"year":2024,"finding":"Using yeast two-hybrid and three-hybrid approaches, RAD51 paralogs (including RAD51D as part of BCDX2) interact with BRCA2 at two distinct hubs: the BRC repeats (BRC1-2) and the DNA binding domain. RAD51D is part of the BCDX2 complex that interacts with BRCA2 BRC repeats.","method":"Yeast two-hybrid, yeast three-hybrid, co-immunoprecipitation","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, yeast hybrid and pulldown, preprint, RAD51D-specific contribution not isolated from complex","pmids":["bio_10.1101_2024.10.10.617680"],"is_preprint":true},{"year":2000,"finding":"Rad51d-deficient mouse embryos die between 8.5–11.5 dpc with posterior truncation and developmental delay; embryonic fibroblasts cannot be propagated, demonstrating that RAD51D is essential for normal mammalian development, consistent with a role in recombinational DNA repair during mitosis.","method":"Gene targeting/knockout in mice, embryo phenotyping, primary fibroblast culture","journal":"Genesis (New York, N.Y. : 2000)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with defined developmental and cellular phenotype, replicated by subsequent studies","pmids":["10705376"],"is_preprint":false},{"year":2011,"finding":"RAD51D-deficient cells are sensitive to PARP inhibitor treatment, demonstrating that RAD51D function in homologous recombination is required for resistance to PARP inhibition.","method":"PARP inhibitor sensitivity assay in RAD51D-deficient cells (inferred from clinical genetics paper describing PARP inhibitor sensitivity in RAD51D-deficient cells)","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — replicated across multiple subsequent studies; original finding established in cell-based assay","pmids":["21822267"],"is_preprint":false},{"year":2009,"finding":"Mouse RAD51D splice variant RAD51DDelta7b (deleted for residues 219–223) retains interaction with both RAD51C and XRCC2, while RAD51D+int3 retains interaction with XRCC2 only. The linker region (residues 54–77) of RAD51D was identified as a region mediating binding with XRCC2. None of the splice variants restore resistance to mitomycin C in Rad51d-deficient cells.","method":"Yeast two-hybrid, EGFP fusion localization, complementation assay, RT-PCR","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid with domain mapping and functional complementation, single lab","pmids":["19327148"],"is_preprint":false}],"current_model":"RAD51D is a RecA/RAD51-family DNA repair protein that functions as part of two distinct heterotetrameric complexes (BCDX2: RAD51B-RAD51C-RAD51D-XRCC2, and XRCC3: XRCC3-RAD51C-RAD51D-XRCC2); the BCDX2 complex uses coupled ATPase activities to nucleate and extend RAD51 filaments on ssDNA for homologous recombination-mediated repair of double-strand breaks and stalled replication forks, while the XRCC3 complex caps the 5' termini of RAD51 filaments to promote homologous pairing. RAD51D itself possesses ssDNA binding and DNA-stimulated ATPase activity (Walker B motif essential for XRCC2/RAD51C interactions), its N-terminal domain mediates XRCC2 binding and ssDNA recognition, and it additionally localizes to telomeres to protect telomeric 3' overhangs from attrition and end-to-end fusions. RAD51D is regulated post-translationally by RNF138-mediated ubiquitination and at the translational level by m6A-dependent YTHDF3 activity, acts downstream of MLH1/mismatch repair to resolve recombinogenic DNA intermediates, and its loss leads to genomic instability, PARP inhibitor sensitivity, and predisposition to ovarian cancer."},"narrative":{"mechanistic_narrative":"RAD51D is a RecA/RAD51-family DNA repair protein that is essential for homologous recombination (HR)-mediated repair of DNA double-strand breaks and for the maintenance of genomic stability and normal mammalian development [PMID:15781618, PMID:10705376]. It is itself a single-stranded DNA-binding protein with DNA-stimulated ATPase activity, and forms a direct heterodimer with XRCC2 that catalyzes homologous pairing and assembles into ring and filamentous structures on ssDNA [PMID:10871607, PMID:11834724]. RAD51D operates within the heterotetrameric BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2), which preferentially binds branched DNA and nucleates and extends RAD51 filaments on ssDNA through coupled ATPase activities, with RAD51C-RAD51D-XRCC2 mimicking three RAD51 protomers in the nascent filament; the same RAD51C-RAD51D-XRCC2 module is shared with a distinct XRCC3-containing complex that caps the 5' filament terminus to promote homologous pairing [PMID:15141025, PMID:37344587, PMID:41196948]. Within these complexes RAD51D's Walker B ATPase motif and its N-terminal domain mediate the XRCC2 and RAD51C interactions required for efficient HR, and its RAD51C interface tunes BCDX2 ATPase kinetics to license RAD51 filament assembly [PMID:16717288, PMID:21111057, PMID:30836272]. RAD51D is required to recruit RAD51 to damage sites and to suppress chromosome instability, mutation, and gene amplification through error-free recombination, and it acts downstream of MLH1-dependent mismatch repair to resolve recombinogenic intermediates generated by O6-methylguanine and thiopurine lesions [PMID:15781618, PMID:16522646, PMID:20133210, PMID:21205838]. Beyond DSB repair, RAD51D localizes to telomeres and protects telomeric 3' overhangs against attrition and end-to-end fusions [PMID:15109494, PMID:28945288]. Its activity is controlled post-translationally by RNF138-mediated ubiquitination, which promotes RAD51D recruitment and HR, and translationally by m6A-dependent YTHDF3 activity [PMID:27161866, PMID:36380687]. Loss of RAD51D function shifts repair toward error-prone single-strand annealing and end-joining, sensitizes cells to PARP inhibition, and clinical missense variants that disrupt the RAD51D-XRCC2 interface impair HR and confer PARP inhibitor sensitivity [PMID:28646019, PMID:27924006, PMID:21822267].","teleology":[{"year":2000,"claim":"Establishing that RAD51D is a bona fide RAD51-family enzyme answered whether this paralog had intrinsic DNA-handling activity rather than being a passive structural protein.","evidence":"Recombinant protein purification with in vitro ATPase and ssDNA-binding assays plus co-immunoprecipitation with XRCC2","pmids":["10871607"],"confidence":"High","gaps":["Did not show how RAD51D activity contributes within a multi-protein complex","No structural basis for ssDNA recognition"]},{"year":2000,"claim":"Knockout established that RAD51D is non-redundantly required for viability and recombinational repair, setting its biological essentiality.","evidence":"Gene-targeted mouse knockout with embryo phenotyping and primary fibroblast culture","pmids":["10705376"],"confidence":"High","gaps":["Embryonic lethality obscured the molecular repair defect","p53-null rescue needed to study cells"]},{"year":2002,"claim":"Demonstrating that the XRCC2-RAD51D complex catalyzes homologous pairing and forms filaments showed it behaves as a recombination mediator at the biochemical level.","evidence":"Co-expressed purified complex in homologous pairing assays and electron microscopy","pmids":["11834724"],"confidence":"High","gaps":["Activity studied as a dimer rather than the full paralog complex","Relationship to RAD51 filament formation not addressed"]},{"year":2004,"claim":"Placing RAD51D in the BCDX2 complex with defined branched-DNA preference clarified the substrate specificity of the paralog assembly.","evidence":"Competitive DNA-binding and strand-annealing assays with purified BCDX2","pmids":["15141025"],"confidence":"High","gaps":["Mechanism of RAD51 filament nucleation not yet resolved","Stoichiometric architecture of the complex unknown"]},{"year":2004,"claim":"Identifying telomere localization and protection extended RAD51D's role beyond DSB repair to genome end maintenance.","evidence":"Immunofluorescence, EM, ChIP, knockout MEFs and siRNA depletion with cytogenetics","pmids":["15109494"],"confidence":"High","gaps":["Whether telomere protection uses the same complexes as DSB repair unclear","Direct binding to telomeric DNA not demonstrated"]},{"year":2005,"claim":"Showing reduced RAD51 focus formation and chromosome instability in knockout cells established RAD51D as required upstream of RAD51 recruitment for HR.","evidence":"Knockout mouse MEFs with survival, cytogenetic, RAD51 foci and sister chromatid exchange assays","pmids":["15781618"],"confidence":"High","gaps":["Molecular step at which RAD51 loading fails not defined","Centrosome fragmentation mechanism unexplained"]},{"year":2006,"claim":"Mapping Walker A and Walker B motif requirements distinguished the ATPase residues needed for catalysis versus paralog interactions, refining the bipartite-ATPase model.","evidence":"Active-site mutagenesis with complementation in deficient cells and yeast hybrid interaction assays","pmids":["16236763","16717288"],"confidence":"High","gaps":["Bipartite ATPase sites inferred but not structurally confirmed at this stage","Single-lab interaction assays"]},{"year":2006,"claim":"Quantifying mutation and gene-amplification rates in RAD51D-deficient cells established that its HR function is error-free and suppresses multiple classes of genetic alteration.","evidence":"Knockout CHO cells with hprt mutation, gene amplification and cytogenetic assays","pmids":["16522646"],"confidence":"High","gaps":["Did not separate DSB repair from replication-associated functions","Pathway redirection upon loss not characterized"]},{"year":2009,"claim":"Identifying SFPQ as a direct partner and synthetic-lethal interactor broadened the interaction network supporting RAD51D-dependent HR.","evidence":"Proteomics, direct interaction assay, siRNA depletion and chromosome instability/cohesion assays","pmids":["20813759"],"confidence":"Medium","gaps":["RAD51D-specific contribution to SFPQ functions not isolated","Single-lab synthetic lethality"]},{"year":2010,"claim":"Solving the NMR structure of the N-terminal domain defined the ssDNA-binding surface and its discrimination against duplex and Holliday-junction DNA.","evidence":"NMR structure determination with EMSA and NMR titration","pmids":["21111057"],"confidence":"High","gaps":["Structure of full-length protein and ATPase core absent","Domain studied in isolation from complex partners"]},{"year":2010,"claim":"Genetic epistasis with MLH1 placed RAD51D-mediated HR downstream of mismatch repair in resolving lesion-induced recombinogenic intermediates.","evidence":"Trp53/Mlh1/Rad51d knockout MEFs with MNNG and 6-thioguanine sensitivity, gamma-H2AX, cell cycle and cytogenetic assays","pmids":["20133210","21205838"],"confidence":"High","gaps":["Identity of the recombinogenic intermediate not biochemically defined","Does not address spontaneous DSB repair pathway order"]},{"year":2016,"claim":"Identifying RNF138-mediated ubiquitination established a post-translational control layer that governs RAD51D recruitment and HR efficiency.","evidence":"Co-IP, ubiquitination assays, RING mutagenesis, siRNA depletion, RAD51 foci and HR reporter assays with live-cell imaging","pmids":["27161866","27195665"],"confidence":"High","gaps":["How ubiquitination mechanistically promotes recruitment unresolved","Deubiquitinase counter-regulation unknown"]},{"year":2017,"claim":"Showing that RAD51D loss redirects repair toward SSA and end-joining explained the large-deletion signature of RAD51D deficiency.","evidence":"Endogenous-locus HR reporter with I-SceI-induced DSBs and deletion mapping in deficient CHO cells","pmids":["27924006"],"confidence":"High","gaps":["Determinants of SSA-versus-NHEJ choice not defined","Generalizability beyond CHO model untested"]},{"year":2017,"claim":"Functional characterization of clinical variants linked the RAD51D-XRCC2 interface directly to HR competence and PARP inhibitor response.","evidence":"Case-control genotyping with yeast two-hybrid, HR and PARP inhibitor sensitivity assays in patient-derived cells","pmids":["28646019"],"confidence":"Medium","gaps":["Single-lab interface mapping","Structural basis of the interface disruption not shown"]},{"year":2019,"claim":"Defining the functional isoform and characterizing Walker-A-proximal cancer variants tied the RAD51D-XRCC2 interaction to DSB repair at endogenous loci.","evidence":"Yeast two/three-hybrid, co-IP and sister chromatid recombination HR reporter in knockout U2OS cells with complementation","pmids":["30836272"],"confidence":"High","gaps":["Mechanism by which interface loss blocks RAD51 loading not resolved","Isoform regulation in vivo unclear"]},{"year":2023,"claim":"Cryo-EM of BCDX2 revealed that RAD51C-RAD51D-XRCC2 mimics RAD51 protomers and that coupled ATPase activities drive RAD51 filament nucleation and extension, providing the structural mechanism for paralog-mediated HR.","evidence":"Cryo-EM, AlphaFold2 modeling, structural proteomics, single-molecule and biochemical filament/ATPase assays","pmids":["37344587"],"confidence":"High","gaps":["Dynamics of RAD51B within the complex incompletely resolved","Telomere-specific complex composition not addressed"]},{"year":2022,"claim":"Identifying the HNF1alpha/YTHDF3 axis showed RAD51D is regulated translationally via m6A, adding a layer controlling its protein output.","evidence":"HNF1alpha and YTHDF3 depletion/overexpression, protein-versus-mRNA western blotting, irradiation assays in cervical cancer cells","pmids":["36380687"],"confidence":"Medium","gaps":["Direct m6A sites on RAD51D mRNA not mapped","Single cancer context"]},{"year":2026,"claim":"Cryo-EM resolved two distinct paralog complexes sharing RAD51C-RAD51D-XRCC2, assigning the RAD51B complex to dynamic filament assembly and the XRCC3 complex to 5'-terminal capping for homologous pairing.","evidence":"Cryo-EM with biochemical filament assembly and single-molecule visualization","pmids":["41196948"],"confidence":"High","gaps":["Functional switching between the two complexes in cells not shown","RAD51D-specific role in each complex not isolated"]},{"year":2026,"claim":"A saturation-scale variant screen mapped HR-critical residues to the DNA-binding/ATPase core and proposed that RAD51D primarily slows BCDX2 ATPase to time RAD51 assembly.","evidence":"Multiplex saturation genome editing assay of 6,888 variants with orthogonal HR, biochemical and ATPase assays (preprint)","pmids":["41542474"],"confidence":"Medium","gaps":["ATPase-slowing model awaits independent confirmation","Variant effects measured in a single assay system","Preprint"]},{"year":null,"claim":"How the two paralog complexes are dynamically partitioned in cells and how RAD51D's distinct DSB-repair versus telomere-protection functions are mechanistically coordinated remains open.","evidence":"","pmids":[],"confidence":"High","gaps":["No in-cell switch between BCDX2 and XRCC3 complexes defined","Telomeric complex composition and recruitment unmapped","Coupling of post-translational/translational regulation to complex assembly unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,12]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,20,23]},{"term_id":"GO:0016787","term_label":"hydrolase 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\"Protein purification, in vitro ATPase assay, ssDNA binding assay, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted purified protein with in vitro enzymatic assay plus direct binding assay; replicated by multiple subsequent studies\",\n      \"pmids\": [\"10871607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The purified human XRCC2·RAD51D complex catalyzes homologous pairing between single-stranded and double-stranded DNA, forms multimeric ring structures in the absence of DNA, and assembles into filamentous structures on ssDNA, similar to other homologous pairing proteins.\",\n      \"method\": \"Recombinant protein co-expression and purification in E. coli, in vitro homologous pairing assay, electron microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified proteins, multiple orthogonal methods (biochemical assay + EM)\",\n      \"pmids\": [\"11834724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"BLM helicase makes a direct physical interaction with RAD51D (RAD51L3) through the N-terminal domain of BLM, and the RAD51D-XRCC2 complex stimulates BLM to disrupt synthetic 4-way (Holliday junction) structures in a manner dependent on direct physical association between BLM and RAD51D.\",\n      \"method\": \"Protein purification, in vitro Holliday junction disruption assay, co-immunoprecipitation, domain-mapping with BLM truncation mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple orthogonal methods (binding + functional assay + mutagenesis via truncation)\",\n      \"pmids\": [\"12975363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2) complex preferentially binds to branched DNA substrates (Y-shaped DNA and synthetic Holliday junctions) over linear ssDNA or dsDNA, and catalyzes strand-annealing between long complementary ssDNA molecules.\",\n      \"method\": \"Competitive DNA-binding assays with purified BCDX2 complex using seven DNA substrate types, strand-annealing assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified reconstituted complex, multiple orthogonal biochemical assays\",\n      \"pmids\": [\"15141025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RAD51D localizes to telomeres in both meiotic and somatic cells; Rad51d-deficient mouse embryonic fibroblasts exhibit telomeric DNA repeat shortening, elevated chromosomal end-to-end fusions, and siRNA-mediated depletion in telomerase-negative human cells also causes telomere erosion and chromosome fusion, establishing a dual role for RAD51D in DNA double-strand break repair and telomere maintenance.\",\n      \"method\": \"Immunofluorescence labeling, electron microscopy, chromatin immunoprecipitation, siRNA knockdown, cytogenetic analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal localization and functional methods (IF, EM, ChIP, KO mouse, siRNA), replicated across cell types\",\n      \"pmids\": [\"15109494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Rad51d-deficient mouse embryonic fibroblasts (in p53-null background) are sensitive to DNA-damaging agents, exhibit extensive chromosome instability (aneuploidy, fragments, complex rearrangements), increased centrosome fragmentation, reduced radiation-induced RAD51 focus formation, and fail to increase sister chromatid exchange in response to mitomycin C, demonstrating RAD51D is required for RAD51 recruitment and homologous recombination repair.\",\n      \"method\": \"Knockout mouse model, cell survival assays, cytogenetic analysis, immunofluorescence for RAD51 foci, sister chromatid exchange assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with multiple defined phenotypic readouts including RAD51 foci formation as direct mechanistic endpoint\",\n      \"pmids\": [\"15781618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The Walker A (ATP binding) motif of RAD51D is required for efficient homologous recombination repair of DNA interstrand crosslinks; Walker A mutations K113R and K113A reduce repair capacity by 83–96% and diminish interaction with RAD51C (8-fold reduction) while retaining interaction with XRCC2.\",\n      \"method\": \"Site-directed mutagenesis, complementation in Rad51d-deficient MEFs, yeast two-hybrid analysis\",\n      \"journal\": \"Mutagenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with functional complementation and protein interaction assays in single lab, multiple orthogonal methods\",\n      \"pmids\": [\"16236763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The Walker B ATPase motif of RAD51D is required for interactions with XRCC2 and RAD51C and for efficient homologous recombinational repair, whereas the Walker A motif is not required for these interactions or complementation of crosslink sensitivity; ATPase sites are proposed to form in a bipartite manner between RAD51D and other paralogs.\",\n      \"method\": \"ATPase motif mutagenesis, complementation in rad51d knockout CHO cells, yeast two- and three-hybrid assays, co-immunoprecipitation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with multiple orthogonal interaction and functional assays in single lab\",\n      \"pmids\": [\"16717288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RAD51D-deficient CHO cells exhibit a 12-fold increased rate of hprt mutation and 4–10-fold increased gene amplification at dhfr and CAD loci, as well as elevated spontaneous chromatid breaks, demonstrating that RAD51D-mediated homologous recombination acts in an error-free manner to suppress multiple classes of genetic alterations.\",\n      \"method\": \"Rad51d knockout CHO cells, hprt mutation assay, gene amplification assay, cytogenetic analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple quantitative mutational readouts, orthogonal assays in single lab\",\n      \"pmids\": [\"16522646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SFPQ/PSF interacts directly with RAD51D (and also RAD51C and XRCC2) as identified by proteomics; depletion of both SFPQ and RAD51D results in a synthetic lethal relationship. SFPQ deficiency alone leads to sister chromatid cohesion defects and chromosome instability, and mediates homology-directed DNA repair.\",\n      \"method\": \"Proteomics screen, direct protein interaction assay, siRNA knockdown, cell viability assay, chromosome instability analysis, sister chromatid cohesion assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction confirmed, multiple functional assays, single lab\",\n      \"pmids\": [\"20813759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The RAD51D E233G variant decreases interaction with RAD51C by ~2-fold while maintaining normal XRCC2 interaction, increases cellular resistance to multiple DNA-damaging agents, reduces anaphase bridge index, and increases proliferation. Molecular modeling suggests glutamic acid-233 forms a salt bridge with lysine-23 in the RAD51D N-terminal domain that is disrupted by the glycine substitution.\",\n      \"method\": \"Yeast two-hybrid, complementation in Rad51d-deficient MEFs, cell survival assays, molecular modeling\",\n      \"journal\": \"Pharmacogenetics and genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus cellular complementation, single lab, multiple functional assays\",\n      \"pmids\": [\"19033885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RAD51D protects cells from MLH1-dependent cytotoxicity induced by O6-methylguanine: Rad51d-deficient cells are 5.3-fold sensitive to MNNG, with G2/M arrest and apoptosis; loss of Mlh1 alleviates this sensitivity, demonstrating that RAD51D-mediated homologous recombination acts downstream of MMR to resolve recombinogenic intermediates created by MMR recognition of O6-meG:T mismatches.\",\n      \"method\": \"Genetic epistasis using Rad51d/Mlh1/Trp53 triple-knockout MEFs, MNNG sensitivity assay, γ-H2AX measurement, cell cycle analysis, apoptosis assay\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis with double/triple KO system, multiple orthogonal readouts establishing pathway order\",\n      \"pmids\": [\"20133210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The NMR solution structure of the human RAD51D N-terminal domain (residues 1-83) consists of four short helices flanked by N- and C-terminal tails, with the N-terminal tail fixed by hydrophobic interactions (Leu4/Thr27, Leu4/Val28, Val6/Ile17). The domain preferentially binds ssDNA over dsDNA and does not bind mobile Holliday junctions, with NMR titration identifying positively charged and hydrophobic surface residues for ssDNA binding.\",\n      \"method\": \"NMR structure determination, EMSA (ssDNA vs dsDNA binding), NMR titration\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure plus functional validation by EMSA and NMR titration, single lab\",\n      \"pmids\": [\"21111057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RAD51D-deficient cells are extremely sensitive to 6-thioguanine; this sensitivity is almost completely rescued by deletion of Mlh1, establishing that RAD51D-mediated homologous recombination acts downstream of MLH1-dependent mismatch repair to resolve 6-thioG-induced recombinogenic lesions. Rad51d-deficient cells also show markedly increased triradial and quadriradial chromosomal aberrations after 6-thioG treatment.\",\n      \"method\": \"Genetic epistasis with Rad51d/Mlh1 double-knockout cells, 6-thioG sensitivity assay, cytogenetic analysis\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis using double KO, multiple readouts, mechanistic pathway placement\",\n      \"pmids\": [\"21205838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RNF138 E3 ubiquitin ligase directly interacts with and ubiquitinates RAD51D; RNF138 depletion increases RAD51D protein stability, reduces RAD51 focus formation, and causes sensitivity to DNA-damaging agents and chromosome instability. The RNF138 RING finger domain is required for RAD51D ubiquitination, and RNF138 presence enhances the RAD51D-XRCC2 interaction.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA depletion, RAD51 foci assay, RING domain mutagenesis, yeast three-hybrid\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct ubiquitination assay with mutagenesis plus multiple orthogonal functional assays, single lab\",\n      \"pmids\": [\"27161866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ubiquitylation of Rad51D by RNF138 promotes homologous recombination repair: RNF138 is recruited to DNA damage sites via its zinc finger domains, is phosphorylated by ATM at Ser124 (though this phosphorylation is dispensable for recruitment), and directly interacts with RAD51D; RNF138 depletion delays and destabilizes RAD51D recruitment to damage sites and reduces HR efficiency.\",\n      \"method\": \"Live cell imaging, co-immunoprecipitation, siRNA depletion, HR reporter assay, comet assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional and localization assays, single lab; partially overlapping findings with PMID 27161866\",\n      \"pmids\": [\"27195665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The RAD51D missense variant p.S207L disrupts the RAD51D-XRCC2 protein-protein interaction and impairs homologous recombination, conferring PARP inhibitor sensitivity; this highlights the RAD51D-XRCC2 interaction as critical for HR function and tumor suppression.\",\n      \"method\": \"Case-control genotyping, yeast two-hybrid interaction assay, HR assay, PARP inhibitor sensitivity assay in patient-derived cells\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional characterization with interaction assay + HR assay + drug sensitivity, single lab\",\n      \"pmids\": [\"28646019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RAD51D deficiency shifts DSB repair from homologous recombination-mediated gene conversion toward single-strand annealing (SSA) and end-joining pathways, resulting in an exceptionally high frequency of large chromosomal deletions surrounding site-specific DSBs; deletions near the break are due to NHEJ while larger deletions use SSA.\",\n      \"method\": \"HR reporter assay at endogenous Aprt locus, I-SceI-induced DSBs, loss-of-function RAD51D-deficient CHO cells, deletion mapping\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO cells, direct quantitative measurement of competing repair pathways with pathway-specific readouts\",\n      \"pmids\": [\"27924006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RAD51D is required for maintaining telomeric 3' overhangs; Rad51d-deficient cells show increased γ-H2AX localization at telomeres following 6-thioguanine treatment and undergo mitotic catastrophe (failed division and restitution) leading to multinucleated cell formation.\",\n      \"method\": \"γ-H2AX foci assay with telomere co-localization, live-cell imaging of mitotic catastrophe, Rad51d-deficient cells\",\n      \"journal\": \"Environmental and molecular mutagenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization + functional imaging, single lab\",\n      \"pmids\": [\"28945288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RAD51D isoform 1 is the functional isoform for HR; isoform 4 (large N-terminal deletion including Walker A motif) and isoform 6 (alternate N-terminal exon) are non-functional. Cancer-associated mutations G96C and G107V near/within the Walker A motif independently disrupt RAD51D interaction with XRCC2, reduce HR efficiency in a sister chromatid recombination reporter assay, and the RAD51D-XRCC2 interaction is required for DSB repair.\",\n      \"method\": \"Yeast two-hybrid and three-hybrid, co-immunoprecipitation, sister chromatid recombination HR reporter assay in RAD51D knockout U2OS cells, functional complementation\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis of cancer variants, multiple orthogonal interaction and functional assays, KO cell complementation\",\n      \"pmids\": [\"30836272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM, AlphaFold2 modeling, and structural proteomics reveal that in the BCDX2 complex, RAD51C-RAD51D-XRCC2 mimics three RAD51 protomers aligned within a nucleoprotein filament while RAD51B is highly dynamic. BCDX2 stimulates nucleation and extension of RAD51 filaments on ssDNA in reactions dependent on the coupled ATPase activities of RAD51B and RAD51C, establishing that BCDX2 orchestrates RAD51 assembly for replication fork protection and double-strand break repair.\",\n      \"method\": \"Cryo-electron microscopy, AlphaFold2 structural modeling, structural proteomics, single-molecule analysis, biochemical RAD51 filament assembly assays, ATPase assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus biochemical reconstitution plus single-molecule assays, multiple orthogonal methods in single high-rigor study\",\n      \"pmids\": [\"37344587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"YTHDF3 mediates translation of RAD51D mRNA in an m6A-dependent manner downstream of HNF1α transcriptional upregulation of YTHDF3; HNF1α positively regulates RAD51D at the protein level but not mRNA level, and this HNF1α/YTHDF3/RAD51D axis promotes radioresistance in cervical cancer cells.\",\n      \"method\": \"Depletion/overexpression of HNF1α and YTHDF3, western blotting (protein vs. mRNA level distinction), in vitro and in vivo irradiation assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection of translational regulation axis, multiple assays in single lab\",\n      \"pmids\": [\"36380687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Cryo-EM reveals two distinct heterotetrameric RAD51 paralog complexes: RAD51B-RAD51C-RAD51D-XRCC2 (RAD51B complex) and XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex). The RAD51B complex promotes dynamic ATP hydrolysis-dependent RAD51 filament assembly, while the XRCC3 complex stably caps the 5' termini of RAD51 filaments to promote homologous pairing, with RAD51C-RAD51D-XRCC2 shared between both complexes.\",\n      \"method\": \"Cryo-electron microscopy, biochemical filament assembly assays, single-molecule visualization\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structural determination with biochemical and single-molecule validation, multiple orthogonal methods\",\n      \"pmids\": [\"41196948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"A high-throughput multiplex assay of 6,888 RAD51D coding variants identifies that variants in the DNA-binding or ATPase core most severely compromise HR. The RAD51D-RAD51C interface within the BCDX2 complex is essential for regulating ATPase activity, and paradoxically, the primary function of RAD51D appears to be slowing the ATPase activity of BCDX2 to allow sufficient time for RAD51 filament assembly.\",\n      \"method\": \"Multiplex assay of variant effect (saturation genome editing), orthogonal HR and biochemical assays across 70 clinical variants, ATPase activity assays\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-throughput functional screen validated by orthogonal biochemical assays, single lab, preprint\",\n      \"pmids\": [\"41542474\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Using yeast two-hybrid and three-hybrid approaches, RAD51 paralogs (including RAD51D as part of BCDX2) interact with BRCA2 at two distinct hubs: the BRC repeats (BRC1-2) and the DNA binding domain. RAD51D is part of the BCDX2 complex that interacts with BRCA2 BRC repeats.\",\n      \"method\": \"Yeast two-hybrid, yeast three-hybrid, co-immunoprecipitation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, yeast hybrid and pulldown, preprint, RAD51D-specific contribution not isolated from complex\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617680\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Rad51d-deficient mouse embryos die between 8.5–11.5 dpc with posterior truncation and developmental delay; embryonic fibroblasts cannot be propagated, demonstrating that RAD51D is essential for normal mammalian development, consistent with a role in recombinational DNA repair during mitosis.\",\n      \"method\": \"Gene targeting/knockout in mice, embryo phenotyping, primary fibroblast culture\",\n      \"journal\": \"Genesis (New York, N.Y. : 2000)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with defined developmental and cellular phenotype, replicated by subsequent studies\",\n      \"pmids\": [\"10705376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RAD51D-deficient cells are sensitive to PARP inhibitor treatment, demonstrating that RAD51D function in homologous recombination is required for resistance to PARP inhibition.\",\n      \"method\": \"PARP inhibitor sensitivity assay in RAD51D-deficient cells (inferred from clinical genetics paper describing PARP inhibitor sensitivity in RAD51D-deficient cells)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple subsequent studies; original finding established in cell-based assay\",\n      \"pmids\": [\"21822267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mouse RAD51D splice variant RAD51DDelta7b (deleted for residues 219–223) retains interaction with both RAD51C and XRCC2, while RAD51D+int3 retains interaction with XRCC2 only. The linker region (residues 54–77) of RAD51D was identified as a region mediating binding with XRCC2. None of the splice variants restore resistance to mitomycin C in Rad51d-deficient cells.\",\n      \"method\": \"Yeast two-hybrid, EGFP fusion localization, complementation assay, RT-PCR\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid with domain mapping and functional complementation, single lab\",\n      \"pmids\": [\"19327148\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAD51D is a RecA/RAD51-family DNA repair protein that functions as part of two distinct heterotetrameric complexes (BCDX2: RAD51B-RAD51C-RAD51D-XRCC2, and XRCC3: XRCC3-RAD51C-RAD51D-XRCC2); the BCDX2 complex uses coupled ATPase activities to nucleate and extend RAD51 filaments on ssDNA for homologous recombination-mediated repair of double-strand breaks and stalled replication forks, while the XRCC3 complex caps the 5' termini of RAD51 filaments to promote homologous pairing. RAD51D itself possesses ssDNA binding and DNA-stimulated ATPase activity (Walker B motif essential for XRCC2/RAD51C interactions), its N-terminal domain mediates XRCC2 binding and ssDNA recognition, and it additionally localizes to telomeres to protect telomeric 3' overhangs from attrition and end-to-end fusions. RAD51D is regulated post-translationally by RNF138-mediated ubiquitination and at the translational level by m6A-dependent YTHDF3 activity, acts downstream of MLH1/mismatch repair to resolve recombinogenic DNA intermediates, and its loss leads to genomic instability, PARP inhibitor sensitivity, and predisposition to ovarian cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAD51D is a RecA/RAD51-family DNA repair protein that is essential for homologous recombination (HR)-mediated repair of DNA double-strand breaks and for the maintenance of genomic stability and normal mammalian development [#5, #25]. It is itself a single-stranded DNA-binding protein with DNA-stimulated ATPase activity, and forms a direct heterodimer with XRCC2 that catalyzes homologous pairing and assembles into ring and filamentous structures on ssDNA [#0, #1]. RAD51D operates within the heterotetrameric BCDX2 complex (RAD51B-RAD51C-RAD51D-XRCC2), which preferentially binds branched DNA and nucleates and extends RAD51 filaments on ssDNA through coupled ATPase activities, with RAD51C-RAD51D-XRCC2 mimicking three RAD51 protomers in the nascent filament; the same RAD51C-RAD51D-XRCC2 module is shared with a distinct XRCC3-containing complex that caps the 5' filament terminus to promote homologous pairing [#3, #20, #22]. Within these complexes RAD51D's Walker B ATPase motif and its N-terminal domain mediate the XRCC2 and RAD51C interactions required for efficient HR, and its RAD51C interface tunes BCDX2 ATPase kinetics to license RAD51 filament assembly [#7, #12, #19]. RAD51D is required to recruit RAD51 to damage sites and to suppress chromosome instability, mutation, and gene amplification through error-free recombination, and it acts downstream of MLH1-dependent mismatch repair to resolve recombinogenic intermediates generated by O6-methylguanine and thiopurine lesions [#5, #8, #11, #13]. Beyond DSB repair, RAD51D localizes to telomeres and protects telomeric 3' overhangs against attrition and end-to-end fusions [#4, #18]. Its activity is controlled post-translationally by RNF138-mediated ubiquitination, which promotes RAD51D recruitment and HR, and translationally by m6A-dependent YTHDF3 activity [#14, #21]. Loss of RAD51D function shifts repair toward error-prone single-strand annealing and end-joining, sensitizes cells to PARP inhibition, and clinical missense variants that disrupt the RAD51D-XRCC2 interface impair HR and confer PARP inhibitor sensitivity [#16, #17, #26].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing that RAD51D is a bona fide RAD51-family enzyme answered whether this paralog had intrinsic DNA-handling activity rather than being a passive structural protein.\",\n      \"evidence\": \"Recombinant protein purification with in vitro ATPase and ssDNA-binding assays plus co-immunoprecipitation with XRCC2\",\n      \"pmids\": [\"10871607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show how RAD51D activity contributes within a multi-protein complex\", \"No structural basis for ssDNA recognition\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Knockout established that RAD51D is non-redundantly required for viability and recombinational repair, setting its biological essentiality.\",\n      \"evidence\": \"Gene-targeted mouse knockout with embryo phenotyping and primary fibroblast culture\",\n      \"pmids\": [\"10705376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Embryonic lethality obscured the molecular repair defect\", \"p53-null rescue needed to study cells\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that the XRCC2-RAD51D complex catalyzes homologous pairing and forms filaments showed it behaves as a recombination mediator at the biochemical level.\",\n      \"evidence\": \"Co-expressed purified complex in homologous pairing assays and electron microscopy\",\n      \"pmids\": [\"11834724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Activity studied as a dimer rather than the full paralog complex\", \"Relationship to RAD51 filament formation not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placing RAD51D in the BCDX2 complex with defined branched-DNA preference clarified the substrate specificity of the paralog assembly.\",\n      \"evidence\": \"Competitive DNA-binding and strand-annealing assays with purified BCDX2\",\n      \"pmids\": [\"15141025\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of RAD51 filament nucleation not yet resolved\", \"Stoichiometric architecture of the complex unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying telomere localization and protection extended RAD51D's role beyond DSB repair to genome end maintenance.\",\n      \"evidence\": \"Immunofluorescence, EM, ChIP, knockout MEFs and siRNA depletion with cytogenetics\",\n      \"pmids\": [\"15109494\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether telomere protection uses the same complexes as DSB repair unclear\", \"Direct binding to telomeric DNA not demonstrated\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing reduced RAD51 focus formation and chromosome instability in knockout cells established RAD51D as required upstream of RAD51 recruitment for HR.\",\n      \"evidence\": \"Knockout mouse MEFs with survival, cytogenetic, RAD51 foci and sister chromatid exchange assays\",\n      \"pmids\": [\"15781618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular step at which RAD51 loading fails not defined\", \"Centrosome fragmentation mechanism unexplained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapping Walker A and Walker B motif requirements distinguished the ATPase residues needed for catalysis versus paralog interactions, refining the bipartite-ATPase model.\",\n      \"evidence\": \"Active-site mutagenesis with complementation in deficient cells and yeast hybrid interaction assays\",\n      \"pmids\": [\"16236763\", \"16717288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Bipartite ATPase sites inferred but not structurally confirmed at this stage\", \"Single-lab interaction assays\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Quantifying mutation and gene-amplification rates in RAD51D-deficient cells established that its HR function is error-free and suppresses multiple classes of genetic alteration.\",\n      \"evidence\": \"Knockout CHO cells with hprt mutation, gene amplification and cytogenetic assays\",\n      \"pmids\": [\"16522646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate DSB repair from replication-associated functions\", \"Pathway redirection upon loss not characterized\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identifying SFPQ as a direct partner and synthetic-lethal interactor broadened the interaction network supporting RAD51D-dependent HR.\",\n      \"evidence\": \"Proteomics, direct interaction assay, siRNA depletion and chromosome instability/cohesion assays\",\n      \"pmids\": [\"20813759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RAD51D-specific contribution to SFPQ functions not isolated\", \"Single-lab synthetic lethality\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Solving the NMR structure of the N-terminal domain defined the ssDNA-binding surface and its discrimination against duplex and Holliday-junction DNA.\",\n      \"evidence\": \"NMR structure determination with EMSA and NMR titration\",\n      \"pmids\": [\"21111057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length protein and ATPase core absent\", \"Domain studied in isolation from complex partners\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic epistasis with MLH1 placed RAD51D-mediated HR downstream of mismatch repair in resolving lesion-induced recombinogenic intermediates.\",\n      \"evidence\": \"Trp53/Mlh1/Rad51d knockout MEFs with MNNG and 6-thioguanine sensitivity, gamma-H2AX, cell cycle and cytogenetic assays\",\n      \"pmids\": [\"20133210\", \"21205838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the recombinogenic intermediate not biochemically defined\", \"Does not address spontaneous DSB repair pathway order\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identifying RNF138-mediated ubiquitination established a post-translational control layer that governs RAD51D recruitment and HR efficiency.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, RING mutagenesis, siRNA depletion, RAD51 foci and HR reporter assays with live-cell imaging\",\n      \"pmids\": [\"27161866\", \"27195665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ubiquitination mechanistically promotes recruitment unresolved\", \"Deubiquitinase counter-regulation unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that RAD51D loss redirects repair toward SSA and end-joining explained the large-deletion signature of RAD51D deficiency.\",\n      \"evidence\": \"Endogenous-locus HR reporter with I-SceI-induced DSBs and deletion mapping in deficient CHO cells\",\n      \"pmids\": [\"27924006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of SSA-versus-NHEJ choice not defined\", \"Generalizability beyond CHO model untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Functional characterization of clinical variants linked the RAD51D-XRCC2 interface directly to HR competence and PARP inhibitor response.\",\n      \"evidence\": \"Case-control genotyping with yeast two-hybrid, HR and PARP inhibitor sensitivity assays in patient-derived cells\",\n      \"pmids\": [\"28646019\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interface mapping\", \"Structural basis of the interface disruption not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining the functional isoform and characterizing Walker-A-proximal cancer variants tied the RAD51D-XRCC2 interaction to DSB repair at endogenous loci.\",\n      \"evidence\": \"Yeast two/three-hybrid, co-IP and sister chromatid recombination HR reporter in knockout U2OS cells with complementation\",\n      \"pmids\": [\"30836272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which interface loss blocks RAD51 loading not resolved\", \"Isoform regulation in vivo unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cryo-EM of BCDX2 revealed that RAD51C-RAD51D-XRCC2 mimics RAD51 protomers and that coupled ATPase activities drive RAD51 filament nucleation and extension, providing the structural mechanism for paralog-mediated HR.\",\n      \"evidence\": \"Cryo-EM, AlphaFold2 modeling, structural proteomics, single-molecule and biochemical filament/ATPase assays\",\n      \"pmids\": [\"37344587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of RAD51B within the complex incompletely resolved\", \"Telomere-specific complex composition not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying the HNF1alpha/YTHDF3 axis showed RAD51D is regulated translationally via m6A, adding a layer controlling its protein output.\",\n      \"evidence\": \"HNF1alpha and YTHDF3 depletion/overexpression, protein-versus-mRNA western blotting, irradiation assays in cervical cancer cells\",\n      \"pmids\": [\"36380687\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct m6A sites on RAD51D mRNA not mapped\", \"Single cancer context\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Cryo-EM resolved two distinct paralog complexes sharing RAD51C-RAD51D-XRCC2, assigning the RAD51B complex to dynamic filament assembly and the XRCC3 complex to 5'-terminal capping for homologous pairing.\",\n      \"evidence\": \"Cryo-EM with biochemical filament assembly and single-molecule visualization\",\n      \"pmids\": [\"41196948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional switching between the two complexes in cells not shown\", \"RAD51D-specific role in each complex not isolated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"A saturation-scale variant screen mapped HR-critical residues to the DNA-binding/ATPase core and proposed that RAD51D primarily slows BCDX2 ATPase to time RAD51 assembly.\",\n      \"evidence\": \"Multiplex saturation genome editing assay of 6,888 variants with orthogonal HR, biochemical and ATPase assays (preprint)\",\n      \"pmids\": [\"41542474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ATPase-slowing model awaits independent confirmation\", \"Variant effects measured in a single assay system\", \"Preprint\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the two paralog complexes are dynamically partitioned in cells and how RAD51D's distinct DSB-repair versus telomere-protection functions are mechanistically coordinated remains open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in-cell switch between BCDX2 and XRCC3 complexes defined\", \"Telomeric complex composition and recruitment unmapped\", \"Coupling of post-translational/translational regulation to complex assembly unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 12]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 20, 23]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [20, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [4, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 17, 20]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 18]}\n    ],\n    \"complexes\": [\"BCDX2 (RAD51B-RAD51C-RAD51D-XRCC2)\", \"XRCC3 complex (XRCC3-RAD51C-RAD51D-XRCC2)\"],\n    \"partners\": [\"XRCC2\", \"RAD51C\", \"RAD51B\", \"BLM\", \"SFPQ\", \"RNF138\", \"XRCC3\", \"BRCA2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}