{"gene":"DMC1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1992,"finding":"DMC1 encodes a meiosis-specific RecA homolog in yeast (S. cerevisiae) required for reciprocal recombination, synaptonemal complex formation, and cell cycle progression past meiotic prophase; dmc1 mutants accumulate double-strand break recombination intermediates and arrest in late meiotic prophase.","method":"Genetic analysis, mutant phenotyping, molecular cloning","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — foundational genetic loss-of-function study with multiple defined phenotypic readouts, independently replicated across many subsequent studies","pmids":["1581960"],"is_preprint":false},{"year":1994,"finding":"Dmc1 and Rad51 colocalize to as many as 64 punctate sites (foci) in spread meiotic nuclei, likely representing recombination intermediates; Dmc1 complexes fail to form in rad51 mutants, while Rad51 complexes persist indefinitely in dmc1 mutants, indicating Rad51 is required upstream of Dmc1 complex formation; Zip1 protein promotes dissociation of Dmc1 complexes.","method":"Immunostaining of spread meiotic nuclei; genetic epistasis with rad51, dmc1, zip1 mutants","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct cytological localization with functional epistasis, replicated by subsequent studies","pmids":["7528104"],"is_preprint":false},{"year":1998,"finding":"Mouse Dmc1 is required for homologous chromosome synapsis during meiosis in both sexes; Dmc1-null males and females are sterile, with meiotic arrest at early zygotene and failure of homolog pairing despite axial element formation.","method":"Targeted gene disruption (knockout mouse); cytological analysis of spermatocytes","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent knockout mouse studies (PMIDs 9660953 and 9660954) with identical phenotypic conclusions","pmids":["9660953","9660954"],"is_preprint":false},{"year":1999,"finding":"Mouse RAD51 and DMC1 colocalize on meiotic chromosome cores at early prophase I and interact with each other and with the chromosome core component SCP3 (COR1) as shown by two-hybrid and in vitro binding assays, suggesting formation of a multiprotein recombination complex on meiotic chromosome cores.","method":"Immunofluorescence, immunoelectron microscopy, yeast two-hybrid, in vitro binding assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal localization plus two-hybrid and in vitro binding; single lab, multiple orthogonal methods","pmids":["10525529"],"is_preprint":false},{"year":1999,"finding":"Human Dmc1 (hDmc1) forms octameric rings rather than helical filaments (unlike RecA and Rad51); DNA binds in the central channel of the ring, representing the likely active form.","method":"Electron microscopy (structural analysis of purified hDmc1 protein)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct structural EM of purified protein; single lab but later confirmed by crystal structure","pmids":["10485886"],"is_preprint":false},{"year":2001,"finding":"Purified S. cerevisiae Dmc1 has weak DNA-dependent ATPase activity, binds ssDNA and dsDNA cooperatively, renatures linearized plasmid DNA, and catalyzes strand assimilation of ssDNA into homologous supercoiled duplex DNA in an ATP-dependent or ATP-independent (AMP-PNP-supported) reaction.","method":"Protein purification, ATPase assay, EMSA, strand assimilation/renaturation assay in vitro","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro biochemical reconstitution with purified protein, multiple orthogonal enzymatic assays","pmids":["11551925"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of full-length human Dmc1 octameric ring resolved; the monomeric structure closely resembles Rad51 and archaeal Rad51; an additional hydrogen bonding interaction at the polymer interface (not present in Rad51) stabilizes the octameric ring over helical filaments. Mutagenesis identified inner and outer basic patches: the inner patch binds both ssDNA and dsDNA, while the outer patch binds ssDNA, suggesting a model for DNA interaction during homologous pairing.","method":"X-ray crystallography, site-directed mutagenesis, DNA binding assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis with functional validation of DNA binding","pmids":["15125839"],"is_preprint":false},{"year":2004,"finding":"Human Dmc1 mediates ATP-dependent DNA strand exchange over at least several thousand base pairs between paired DNA substrates; the reaction requires RPA and initiates through nucleation of hDmc1 onto ssDNA to form a helical nucleoprotein filament.","method":"In vitro strand exchange assay with purified proteins; electron microscopy of nucleoprotein filaments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of strand exchange with purified human protein, EM structural validation, multiple substrate conditions tested","pmids":["15164066"],"is_preprint":false},{"year":2004,"finding":"Meiosis-specific proteins Mei5 and Sae3 form a ternary complex with Dmc1 and are required for assembly of Dmc1 (but not Rad51) on meiotic chromosomes and at recombination hot spots; their recruitment requires Rad51; the Dmc1-Mei5-Sae3 complex is integrated onto Rad51 ensembles.","method":"Genetic analysis (mei5, sae3 mutants), chromatin immunoprecipitation, immunostaining of meiotic chromosomes, co-immunoprecipitation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus ChIP plus cytology plus genetic epistasis; multiple orthogonal methods","pmids":["15620352"],"is_preprint":false},{"year":2004,"finding":"The Hop2-Mnd1 heterodimer stimulates the strand assimilation activity of Dmc1 in vitro and functions in the same genetic pathway as HOP2, MND1, and DMC1 for homologous chromosome juxtaposition in S. cerevisiae; Hop2 and Mnd1 form a stable heterodimer with higher affinity for dsDNA than ssDNA.","method":"In vitro strand assimilation assay, double-mutant epistasis analysis, protein-protein interaction assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with purified proteins plus genetic epistasis","pmids":["15249670"],"is_preprint":false},{"year":2004,"finding":"Human MSH4 physically interacts with both RAD51 and DMC1 in biochemical pulldown assays, and a subset of MSH4 foci colocalize with DMC1/RAD51 complexes on mouse meiotic chromosomes.","method":"In vitro binding assay (pulldown), immunolocalization on mouse meiotic chromosomes","journal":"Molecular human reproduction","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single pulldown plus colocalization; two orthogonal methods in a single lab","pmids":["15489243"],"is_preprint":false},{"year":2005,"finding":"Mouse HOP2/TBPIP stimulates DMC1-mediated homologous pairing in vitro but does not stimulate RAD51; the stimulatory effect requires HOP2 to first bind dsDNA; the C-terminal basic region of HOP2 is required for DNA binding and for pairing stimulation.","method":"In vitro homologous pairing assay with purified proteins, deletion mutagenesis, DNA binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, mutagenesis revealing mechanistic determinants","pmids":["15192114"],"is_preprint":false},{"year":2005,"finding":"Mouse Hop2-Mnd1 heterodimer physically interacts with both Rad51 and Dmc1 recombinases and stimulates their D-loop/strand invasion activity up to 35-fold; Hop2-Mnd1 stimulates Dmc1 by stabilizing ssDNA nucleoprotein complexes and facilitating dsDNA capture by the Dmc1-ssDNA filament.","method":"D-loop assay, strand invasion assay, co-immunoprecipitation, protein-protein interaction assays with purified proteins","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple mechanistic steps defined","pmids":["15834424"],"is_preprint":false},{"year":2005,"finding":"Ca2+ stimulates the DNA strand exchange activity of human Dmc1 through conformational changes that stabilize hDmc1-ssDNA filament complexes; unlike for hRad51, Ca2+ stimulation of hDmc1 does not act primarily through inhibition of ATPase activity (hDmc1 does not self-convert into a stable ADP-bound complex).","method":"In vitro strand exchange assay, ATPase assay, electron microscopy of nucleoprotein filaments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with mechanistic dissection; multiple assays","pmids":["15917244"],"is_preprint":false},{"year":2005,"finding":"Ca2+ enables yeast Dmc1 to form regular helical filaments on ssDNA and activates its strand assimilation activity; Ca2+ increases Dmc1's affinity for ATP and reduces DNA-dependent ATPase activity, supporting the view that ATP binding (not hydrolysis) is required for functional filament structure.","method":"In vitro strand assimilation assay, ATPase assay, electron microscopy of Dmc1-ssDNA filaments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical and structural analysis with mechanistic dissection","pmids":["16204247"],"is_preprint":false},{"year":2005,"finding":"The N-terminal domain (residues 1–81) of human DMC1 is required for octamer formation; deletion of this domain (DMC1-82-340) produces a heptamer and abolishes both ssDNA and dsDNA binding activities.","method":"Analytical ultracentrifugation, DNA binding assays, deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with quantitative structural and functional analyses","pmids":["15917243"],"is_preprint":false},{"year":2005,"finding":"The N-terminal domain of DMC1 (residues 1–81) was found to be highly flexible in the octameric ring crystal structure, in contrast to the Rad51 N-terminal domain which makes specific contacts in the helical filament; this structural difference may explain distinct oligomeric forms.","method":"X-ray crystallography (crystal structure of octameric ring) — this finding is coincident with PMID 15125839 but specifically noted for N-terminal domain","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — structural observation from crystal structure, mechanistic implication supported by mutagenesis in same paper","pmids":["15917243"],"is_preprint":false},{"year":2005,"finding":"Mei5-Sae3 complex preferentially binds ssDNA, relieves RPA-imposed inhibition of Dmc1's strand assimilation and DNA binding activities, and physically interacts with RPA; Mei5-Sae3 acts as a mediator of Dmc1 assembly onto RPA-coated ssDNA.","method":"In vitro strand assimilation assay, DNA binding assay, protein-protein interaction assay with purified proteins","journal":"Genetics (Tsubouchi & Roeder 2004 PMID 15579681) / Journal of Biological Chemistry (Ferrari et al. 2009 PMID 19270307)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with purified proteins demonstrating mediator activity; confirmed by two independent studies","pmids":["15579681","19270307"],"is_preprint":false},{"year":2006,"finding":"The S. pombe Swi5-Sfr1 complex, at substoichiometric concentrations, stimulates Dmc1-mediated strand exchange on long DNA substrates; the complex overcomes RPA-mediated inhibition of Dmc1, increases the amount of Dmc1 bound to ssDNA, and preferentially stimulates ssDNA-dependent ATPase of Rad51.","method":"In vitro strand exchange assay, ssDNA-binding assay, ATPase assay with purified proteins","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple biochemical assays","pmids":["16921379"],"is_preprint":false},{"year":2006,"finding":"Tid1/Rdh54 promotes dissociation of Dmc1 from nonrecombinogenic (non-DSB) chromatin sites; an activity shared by Tid1 and Rad54 is required for normal assembly of Dmc1 at DSB sites; Tid1's DNA translocase ATPase activity mediates Dmc1 removal from nonproductive chromatin.","method":"Chromatin immunoprecipitation, genetic analysis in dmc1, tid1, rad54 mutants","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP with genetic epistasis, mechanistic model supported by multiple mutant combinations","pmids":["16980587"],"is_preprint":false},{"year":2006,"finding":"Human Rad54B stabilizes the Dmc1-ssDNA nucleoprotein complex and thereby enhances Dmc1-mediated DNA strand exchange activity in vitro.","method":"In vitro DNA strand exchange assay, ssDNA binding assay with purified proteins","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution; single lab, two orthogonal assays","pmids":["16945962"],"is_preprint":false},{"year":2007,"finding":"Human BRCA2 directly binds DMC1 via a distinct 26-amino-acid region (residues 2386–2411, the PhePP motif, critical residues Phe2406, Pro2408, Pro2409) that is separate from the RAD51 interaction domain; BRCA2 thus coordinates interactions with both recombinases at meiosis through distinct binding sites.","method":"Pulldown/binding assays with truncation and point mutants of BRCA2; co-immunoprecipitation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays with mutagenesis defining minimal interaction domain; multiple orthogonal methods","pmids":["17541404"],"is_preprint":false},{"year":2007,"finding":"A missense mutation in the L2 DNA-binding domain of mouse Dmc1 (Dmc1Mei11) abolishes strand invasion activity; in male heterozygotes, meiosis arrests in pachynema with incomplete synapsis and no crossing-over; female heterozygotes show reduced oocyte pool but partially compensate, revealing a sex difference in DMC1 dependence.","method":"Mouse mutagenesis screen, in vitro strand invasion assay with mutant protein, cytological analysis of meiosis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — dominant allele with defined in vitro activity loss plus in vivo cytological phenotype","pmids":["17425408"],"is_preprint":false},{"year":2008,"finding":"Rad51 and Dmc1 (from both human and budding yeast) form essentially identical nucleoprotein filaments with respect to persistence length, helical pitch, filament diameter, DNA base pairs per helical turn, and handedness; differences in meiotic function are therefore likely due to distinct accessory proteins rather than intrinsic filament structural differences.","method":"Comparative electron microscopy of filaments from both human and yeast proteins; quantitative structural analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct structural comparison of purified proteins by EM with quantitative parameters","pmids":["18535008"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of human DMC1-M200V variant in octameric ring form shows reduced protein stability; biochemical assays demonstrate the variant is moderately defective in in vitro recombination reactions; the corresponding M194V mutation in S. pombe dmc1 significantly decreases meiotic homologous recombination frequency.","method":"X-ray crystallography, in vitro recombination assay, genetic analysis in fission yeast","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biochemical assay plus genetic validation across organisms","pmids":["18566005"],"is_preprint":false},{"year":2008,"finding":"Purified S. pombe Rdh54 forms a complex with Dmc1 and enhances Dmc1 recombinase activity; Rdh54 also mediates efficient removal of Dmc1 from dsDNA in an ATPase-dependent manner, preventing nonproductive Dmc1-chromatin interactions.","method":"Co-immunoprecipitation with purified proteins, in vitro recombinase activity assay, dsDNA dissociation assay, ATPase mutant analysis","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple functional assays including ATPase-dead mutant","pmids":["19028606"],"is_preprint":false},{"year":2010,"finding":"DMC1-driven D-loops are substantially more resistant to dissociation by branch-migration proteins (e.g., RAD54) than RAD51-driven D-loops; this resistance may channel DMC1 recombination intermediates toward the double-strand break repair pathway (crossovers) rather than synthesis-dependent strand annealing (non-crossovers).","method":"In vitro D-loop formation and dissociation assay with purified human DMC1, RAD51, and RAD54 proteins","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified human proteins, direct mechanistic comparison","pmids":["21151113"],"is_preprint":false},{"year":2011,"finding":"RAD51AP1 physically associates with DMC1 via a conserved WVPP motif (distinct from its RAD51-interaction domain) and stimulates DMC1-mediated D-loop formation by enhancing the ability of the DMC1 presynaptic filament to capture duplex DNA and assemble the synaptic complex; RAD51AP1 colocalizes with a subset of DMC1 foci in mouse spermatocytes.","method":"Co-immunoprecipitation, in vitro D-loop assay, synaptic complex assay with purified proteins, immunofluorescence on mouse spermatocytes","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with mutagenesis plus in vivo colocalization; multiple orthogonal methods","pmids":["21307306"],"is_preprint":false},{"year":2011,"finding":"RAD51AP1 interacts with DMC1 through a conserved WVPP motif in RAD51AP1 that is critical for DMC1 interaction but dispensable for RAD51 association; this motif is similar to the FVPP (PhePP) motif in BRCA2 that mediates DMC1 interaction.","method":"Truncation and point-mutation mapping of RAD51AP1 interaction sites; co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with defined mutagenesis; single lab","pmids":["21903585"],"is_preprint":false},{"year":2012,"finding":"Using a separation-of-function Rad51 mutant retaining filament-forming but not joint-molecule (JM) activity, Rad51's JM activity is shown to be fully dispensable for meiotic recombination, while the equivalent Dmc1 mutation causes profound recombination defect; Dmc1's JM activity alone is responsible for meiotic recombination. Biochemical evidence shows Rad51 acts with Mei5-Sae3 as a Dmc1 accessory factor.","method":"Separation-of-function mutant analysis in yeast, in vitro biochemical assay of strand exchange activity","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — genetic separation-of-function alleles combined with biochemical reconstitution; rigorous functional dissection","pmids":["22955832"],"is_preprint":false},{"year":2012,"finding":"Purified Dmc1 and Tid1 physically interact and Tid1 stimulates Dmc1-mediated joint molecule formation in vitro; under conditions optimal for Dmc1, Rad51 is specifically stimulated by Rad54 (not Tid1), establishing Dmc1-Tid1 and Rad51-Rad54 as functionally specific pairs; Dmc1-Tid1 promotes interhomolog while Rad51-Rad54 promotes intersister strand exchange.","method":"In vitro joint molecule/D-loop assay, physical interaction assay with purified proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, specificity demonstrated by comparative functional assays","pmids":["22761450"],"is_preprint":false},{"year":2013,"finding":"Purified S. cerevisiae Dmc1 (when ATP is included during purification to prevent aggregation) forms D-loops and responds to accessory factors Rad54 and Rdh54; EM reconstruction reveals the ScDmc1-ssDNA nucleoprotein filament has 6.5 protomers per turn with a pitch of ~106 Å.","method":"Protein purification, D-loop assay, negative-stain electron microscopy with helical reconstruction","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with structural EM characterization","pmids":["23769192"],"is_preprint":false},{"year":2014,"finding":"Budding yeast Hop2-Mnd1 (using the newly identified full-length ORF including exon 3) stimulates ScDmc1 D-loop activity up to 30-fold (much greater than previously reported 3-fold); stimulation requires physiological concentrations of Ca2+ (with Mg2+ also present); stimulation of Dmc1 by Hop2-Mnd1 is specific to Dmc1 and does not extend to Rad51 in budding yeast.","method":"In vitro D-loop assay with purified proteins, Ca2+/Mg2+ titration, order-of-addition experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with corrected protein sequence, multiple mechanistic conditions tested","pmids":["24798326"],"is_preprint":false},{"year":2015,"finding":"Distinct DNA-binding activities of Hop2-Mnd1 mediate either stabilization of the RAD51-ssDNA presynaptic filament or stimulation of the homologous DNA pairing reaction; ATP enhances the interaction between Hop2-Mnd1 and RAD51; both Hop2 and Mnd1 C-terminal regions are required for RAD51 (and DMC1) interaction; the HOP2 p.del201Glu mutation found in XX ovarian dysgenesis diminishes functional synergy with both RAD51 and DMC1.","method":"In vitro D-loop assay, presynaptic filament stabilization assay, co-immunoprecipitation with mutant proteins, pulldown with purified proteins","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis and disease variant; multiple orthogonal biochemical assays","pmids":["25820426"],"is_preprint":false},{"year":2015,"finding":"Dmc1-mediated strand exchange is sensitive to mismatch location, type, and distribution; mismatches near the 5' end of the initiating strand impede strand exchange dramatically, while 3'-end mismatches have little effect; Hop2-Mnd1 stimulates Dmc1-catalyzed strand exchange on homologous DNA and with a single mismatch.","method":"FRET-based strand exchange assay with defined mismatch-containing oligonucleotides and purified Dmc1/Hop2-Mnd1","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with systematic mismatch panel, quantitative mechanistic analysis","pmids":["26709229"],"is_preprint":false},{"year":2016,"finding":"Human BRCA2 BRC repeats interact directly with DMC1; most BRC repeats stimulate DMC1 joint molecule formation; BRC repeats 1-3 bind RAD51 more tightly, while BRC repeats 6-8 bind DMC1 more tightly; BRC repeat stimulation of DMC1 operates by enhancing DMC1-ssDNA complex formation; full-length BRCA2 stimulates DMC1-mediated DNA strand exchange between RPA-ssDNA complexes and duplex DNA, acting as a mediator of DMC1.","method":"In vitro D-loop/joint molecule assay with purified proteins, BRC repeat binding assays, full-length BRCA2 biochemical reconstitution","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified full-length BRCA2 and DMC1, BRC repeat mutagenesis panel, multiple assays","pmids":["26976601"],"is_preprint":false},{"year":2018,"finding":"Meiosis-specific recombinase Dmc1 is a potent inhibitor of the Srs2 anti-recombinase; Dmc1 inhibits Srs2 ATP hydrolysis, preventing Srs2 from undergoing ATP-dependent translocation on Dmc1-bound recombination intermediates, thereby protecting crossover intermediates from dissociation during meiosis.","method":"Biochemical assay (ATPase), single-molecule imaging of Srs2 translocation on Dmc1 filaments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical plus single-molecule reconstitution with defined mechanistic readout","pmids":["30301803"],"is_preprint":false},{"year":2018,"finding":"Rad51 and Dmc1 spontaneously self-segregate within mixed presynaptic filaments without requiring other recombination accessory proteins; Dmc1 stabilizes adjacent Rad51 filaments through cross-talk between the two recombinases.","method":"Single-molecule imaging (total internal reflection fluorescence microscopy) of fluorescently labeled Rad51 and Dmc1","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — single-molecule direct visualization of filament composition dynamics with purified proteins","pmids":["29382724"],"is_preprint":false},{"year":2019,"finding":"In vitro reconstitution of Dmc1 recombination using six purified S. cerevisiae proteins (Dmc1, RPA, Rad51, Rdh54/Tid1, Mei5-Sae3, Hop2-Mnd1) shows each accessory protein contributes to D-loop formation; RPA plays multiple stimulatory roles including overcoming inhibitory ssDNA secondary structure, elongating D-loops, and limiting inhibitory interactions of Hop2-Mnd1 and Rdh54/Tid1 with the Dmc1-ssDNA filament; Rad51 and Dmc1 directly interact in a manner enhanced by Mei5-Sae3.","method":"In vitro D-loop reconstitution assay with six purified proteins; direct protein-protein interaction assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — comprehensive biochemical reconstitution with six purified proteins, systematic dissection of each component's role","pmids":["30462332"],"is_preprint":false},{"year":2019,"finding":"Three Dmc1 lineage-specific amino acids (not present in Rad51) are responsible for Dmc1's ability to stabilize mismatch-containing heteroduplex DNA base triplets; chimeric Rad51 mutants harboring Dmc1-specific amino acids gain mismatch tolerance, while Dmc1 mutants with Rad51-specific amino acids lose it.","method":"Chimeric protein mutagenesis, in vitro strand exchange assay with mismatched substrates, genetic analysis in yeast and C. elegans","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — chimeric mutagenesis with in vitro biochemical validation and in vivo genetic confirmation","pmids":["31371435"],"is_preprint":false},{"year":2020,"finding":"In vivo mapping in a hybrid mouse shows DMC1 binds near the DSB site on ssDNA, while RAD51 binds away from the break; these data support DMC1 (not RAD51) performing strand exchange in mammalian meiosis.","method":"Chromatin immunoprecipitation sequencing (ChIP-seq) on individual homologous chromosomes in hybrid mouse; super-resolution microscopy","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — high-resolution in vivo ChIP-seq with allele-specific resolution plus super-resolution microscopy; rigorous multi-method approach","pmids":["32610038"],"is_preprint":false},{"year":2020,"finding":"C19orf57/BRME1 associates with BRCA2 and MEILB2/HSF2BP (which recruit recombinases to DSBs); BRME1 knockout in mouse spermatocytes delays removal of ssDNA-binding proteins from DSB sites and impairs loading of RAD51 and DMC1 onto resected ssDNA, demonstrating BRME1 modulates localization of recombinases to meiotic DSB sites.","method":"Co-immunoprecipitation, conditional knockout mouse, immunostaining of spermatocytes","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus KO mouse with specific immunostaining readout; single lab","pmids":["32460033"],"is_preprint":false},{"year":2020,"finding":"ScDmc1 nucleoprotein filaments are less stable than ScRad51 filaments due to a kinetically reduced nucleation step arising from lower ssDNA affinity; ScDmc1 nucleates preferentially at ssDNA-dsDNA junctions with 5'-to-3' polarity extension; short ScRad51 patches stimulate ScDmc1 nucleation through direct protein-protein interaction between ScDmc1 and ScRad51, but not with EcRecA.","method":"Single-molecule tethered particle motion experiments, in vitro filament assembly assay, pulldown assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — single-molecule real-time kinetics plus biochemical pulldown; multiple orthogonal approaches","pmids":["32404423"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of human Dmc1-DNA and Rad51-DNA complexes reveal that the major conformational differences are in their Loop2 regions; V273 and D274 in RAD51 (corresponding to P274 and G275 in DMC1) are key residues controlling mismatch tolerance during strand exchange; replacing Loop2 residues with Rad51 counterparts enhances DMC1 fidelity and vice versa.","method":"Cryo-EM structure determination, molecular dynamics simulation, single-molecule FRET, site-directed mutagenesis with in vitro strand exchange assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structures plus MD simulation plus smFRET plus mutagenesis; multiple orthogonal methods","pmids":["34871438"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of DMC1 presynaptic and postsynaptic complexes show Loop1 Gln244 (Met243 in RAD51) stabilizes DNA backbone and Loop2 Pro274/Gly275 (Val273/Asp274 in RAD51) form an open 'triplet gate' for mismatch tolerance; replacing Loop1 or Loop2 residues of DMC1 with RAD51 counterparts enhances DMC1 fidelity, confirming the structural basis for distinctive mismatch tolerance.","method":"Cryo-EM, molecular dynamics simulation, site-directed mutagenesis with in vitro functional assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM plus MD simulation plus mutagenesis; multiple orthogonal methods","pmids":["33446654"],"is_preprint":false},{"year":2021,"finding":"In Arabidopsis, RAD51 physically interacts with the SMC5/6 complex and restrains SMC5/6 from inhibiting DMC1 localization to meiotic chromosomes; loss of SMC5/6 partially suppresses rad51 knockout sterility in a DMC1-dependent manner.","method":"Arabidopsis genetics (double knockout suppressor analysis), immunostaining, co-immunoprecipitation","journal":"The Plant cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic suppressor epistasis plus co-IP plus cytology; multiple methods, plant ortholog","pmids":["34009315"],"is_preprint":false},{"year":2023,"finding":"FIGNL1 AAA+ ATPase dismantles RAD51 and DMC1 filaments on both ssDNA and dsDNA in vitro; conditional knockout of FIGNL1 in mouse germline causes accumulation of RAD51/DMC1 on meiotic chromosomes and in pre-meiotic S-phase (independently of meiotic DSBs), defective chromosome synapsis, and impaired meiotic DSB repair.","method":"Conditional knockout mouse, immunostaining of spermatocytes, in vitro filament disassembly assay with purified FIGNL1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution plus conditional KO mouse with multiple cytological readouts","pmids":["37891173"],"is_preprint":false},{"year":2006,"finding":"In Coprinus cinereus, Lim15/Dmc1 (CcLim15) is sumoylated during meiosis via interaction with the SUMO E2 conjugating enzyme Ubc9; Ubc9 binds the C-terminus (residues 105–347) of CcLim15 containing the ATPase domain; CcLim15 and CcUbc9 colocalize in meiotic nuclei from leptotene to early pachytene.","method":"In vitro protein-protein interaction assay, co-immunoprecipitation, immunocytochemistry, in vivo and in vitro sumoylation assay","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus in vitro sumoylation assay plus colocalization; fungal ortholog, multiple methods","pmids":["16879611"],"is_preprint":false},{"year":2005,"finding":"In Coprinus cinereus, DNA topoisomerase II (CcTopII) specifically interacts with CcLim15/Dmc1 in vitro and in vivo; CcLim15 activates the relaxation/catenation activity of CcTopII in vitro; CcTopII suppresses CcLim15-dependent strand transfer; CcTopII enhances CcLim15 DNA-dependent ATPase activity while CcLim15 inhibits CcTopII ATPase; the two proteins colocalize on meiotic chromosomes from leptotene to zygotene.","method":"In vitro binding assay, co-immunoprecipitation, relaxation/strand transfer/ATPase assays, immunolocalization","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus multiple functional assays in vitro plus colocalization; fungal ortholog, single lab","pmids":["16221977"],"is_preprint":false},{"year":2005,"finding":"Mei1 is epistatic to Dmc1 in mouse meiosis; double Dmc1-/-Mei1-/- mutant phenotype is identical to Mei1-/- alone, positioning Mei1 upstream of Dmc1 in the meiotic recombination pathway (consistent with Mei1 being required for DSB formation upstream of Dmc1-dependent repair).","method":"Double knockout mouse epistasis analysis; oogenesis phenotype comparison","journal":"Chromosoma","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic epistasis in mouse double mutants; single lab","pmids":["15928951"],"is_preprint":false}],"current_model":"DMC1 is a meiosis-specific RecA/Rad51-family recombinase that forms helical nucleoprotein filaments (and also octameric rings) on ssDNA generated at programmed DSBs; these filaments catalyze ATP-dependent homologous DNA strand exchange and D-loop formation with a distinctive mismatch tolerance conferred by Loop1/Loop2 residues; DMC1 acts as the primary strand-exchange enzyme in meiosis (with RAD51 serving as an accessory factor via Mei5-Sae3 and direct filament interactions), is specifically recruited near DSB ends in vivo, produces D-loops that are intrinsically resistant to branch-migration dissociation (promoting crossovers), inhibits the Srs2 anti-recombinase, and is regulated by a network of accessory factors including HOP2-MND1, RAD51AP1, BRCA2, Mei5-Sae3, Tid1/Rdh54, and FIGNL1, as well as by post-translational modifications such as SUMO conjugation."},"narrative":{"mechanistic_narrative":"DMC1 is a meiosis-specific RecA/RAD51-family recombinase that catalyzes the homologous strand-exchange reaction underlying meiotic recombination, and its loss arrests cells in meiotic prophase with unrepaired double-strand-break intermediates and failed homolog synapsis [PMID:1581960, PMID:9660953, PMID:9660954]. Mechanistically, DMC1 assembles on resected single-stranded DNA at programmed DSBs—in mammalian meiosis it binds near the break end while RAD51 occupies positions away from the break, identifying DMC1 as the principal strand-exchange enzyme in vivo [PMID:32610038]. Purified DMC1 binds ssDNA and dsDNA, possesses weak DNA-dependent ATPase activity, and performs ATP-dependent strand exchange and D-loop formation through a presynaptic nucleoprotein filament; ATP binding rather than hydrolysis supports the active filament, and Ca2+ stabilizes it [PMID:11551925, PMID:15164066, PMID:15917244, PMID:16204247]. Although human DMC1 can be captured as an octameric ring stabilized by an N-terminal-domain interface absent in RAD51, the functional filament is helical and structurally near-identical to RAD51, so its distinctive meiotic behavior arises from sequence-specific features and accessory factors rather than gross filament architecture [PMID:10485886, PMID:15125839, PMID:15917243, PMID:18535008]. A defining property is mismatch tolerance during strand exchange, conferred by DMC1-specific Loop1/Loop2 residues (Gln244, Pro274/Gly275) that form an open 'triplet gate' permitting heteroduplex with mismatches; transplanting these residues between DMC1 and RAD51 swaps their fidelity [PMID:31371435, PMID:34871438, PMID:33446654]. DMC1-generated D-loops are intrinsically resistant to branch-migration dissociation and DMC1 inhibits the Srs2 anti-recombinase, properties that protect joint molecules and channel intermediates toward crossover formation [PMID:21151113, PMID:30301803]. DMC1 activity is governed by a network of accessory factors: HOP2-MND1 stimulates pairing by stabilizing the presynaptic filament and promoting duplex capture, Mei5-Sae3 and Swi5-Sfr1 relieve RPA inhibition and mediate filament assembly, BRCA2 and RAD51AP1 act as mediators via DMC1-specific motifs (the BRCA2 PhePP and RAD51AP1 WVPP motifs), Tid1/Rdh54 enhances joint-molecule formation while clearing DMC1 from nonproductive chromatin, and FIGNL1 dismantles DMC1 filaments [PMID:15249670, PMID:15834424, PMID:15579681, PMID:19270307, PMID:16921379, PMID:17541404, PMID:21307306, PMID:26976601, PMID:22761450, PMID:16980587, PMID:37891173]. RAD51 itself functions partly as a DMC1 accessory factor whose joint-molecule activity is dispensable for meiotic recombination, since DMC1's strand-exchange activity alone drives the process [PMID:22955832].","teleology":[{"year":1992,"claim":"Established that meiotic recombination requires a dedicated, meiosis-specific RecA-like enzyme, defining DMC1 as a core factor whose absence blocks reciprocal recombination and prophase progression.","evidence":"Genetic loss-of-function and mutant phenotyping in budding yeast","pmids":["1581960"],"confidence":"High","gaps":["No biochemical activity demonstrated","Relationship to RAD51 unresolved"]},{"year":1994,"claim":"Placed DMC1 in an ordered relationship with RAD51 at recombination sites by showing DMC1 focus formation depends on RAD51, framing the two recombinases as cooperating but distinct.","evidence":"Immunostaining of spread meiotic nuclei with rad51/dmc1/zip1 epistasis","pmids":["7528104"],"confidence":"High","gaps":["Molecular basis of co-dependence unknown","Whether colocalization reflects mixed filaments untested"]},{"year":1998,"claim":"Demonstrated DMC1 is essential for homolog synapsis and fertility in a mammal, establishing conservation of its meiotic role and showing axial elements form without DMC1 but pairing fails.","evidence":"Dmc1-null knockout mice, cytology of spermatocytes/oocytes","pmids":["9660953","9660954"],"confidence":"High","gaps":["Catalytic mechanism in vivo not addressed","Sex differences not yet dissected"]},{"year":2004,"claim":"Reconstituted DMC1 as a bona fide ATP-dependent strand-exchange recombinase that nucleates a helical filament on ssDNA and requires RPA, defining its core enzymatic activity.","evidence":"In vitro strand exchange and EM with purified human protein; earlier yeast strand-assimilation biochemistry","pmids":["15164066","11551925"],"confidence":"High","gaps":["In vivo filament composition not addressed","Crossover-bias mechanism unknown"]},{"year":2004,"claim":"Resolved the structural paradox between DMC1's octameric ring and active filament by crystallizing the human octamer, mapping DNA-binding patches, and tracing ring stabilization to an N-terminal interface absent in RAD51.","evidence":"X-ray crystallography, mutagenesis, DNA-binding and oligomerization assays","pmids":["15125839","15917243","15917244"],"confidence":"High","gaps":["Functional role of octamer vs filament unresolved","Crystal lacked DNA-bound filament"]},{"year":2005,"claim":"Identified Mei5-Sae3 and HOP2-MND1 as mediators that overcome RPA inhibition and stimulate DMC1 filament assembly and pairing, explaining how DMC1 is loaded and activated at DSBs.","evidence":"In vitro reconstitution, DNA-binding, ChIP, cytology and genetics across yeast and mouse orthologs","pmids":["15620352","15579681","19270307","15192114","15834424","15249670"],"confidence":"High","gaps":["Stoichiometry on chromatin in vivo unclear","Order of mediator action incompletely defined"]},{"year":2006,"claim":"Defined Tid1/Rdh54 and Rad54B as DMC1 partners that both stimulate recombinase activity and clear DMC1 from nonproductive chromatin, introducing quality-control of filament placement.","evidence":"ChIP and genetics; in vitro recombinase, dsDNA-dissociation and ATPase-mutant assays","pmids":["16980587","16945962","16921379","19028606"],"confidence":"High","gaps":["How removal is targeted to nonproductive sites mechanistically incomplete"]},{"year":2007,"claim":"Mapped a dedicated DMC1-binding site on BRCA2 (the PhePP motif), distinct from its RAD51 site, and a defective L2 DNA-binding allele in mouse, linking specific DMC1 contacts and residues to meiotic strand-invasion function.","evidence":"BRCA2 truncation/point-mutant binding assays; mouse Dmc1Mei11 mutant with in vitro activity loss and cytology","pmids":["17541404","17425408"],"confidence":"High","gaps":["In vivo consequence of BRCA2-DMC1 disruption alone not isolated","Basis of sex-specific dependence unexplained"]},{"year":2010,"claim":"Provided a mechanistic basis for DMC1's pro-crossover function by showing its D-loops resist branch-migration dissociation far better than RAD51 D-loops.","evidence":"In vitro D-loop formation/dissociation with purified human DMC1, RAD51, RAD54","pmids":["21151113"],"confidence":"High","gaps":["Direct link to crossover vs non-crossover choice in vivo not shown"]},{"year":2011,"claim":"Established RAD51AP1 as a DMC1 mediator acting through a conserved WVPP motif that enhances duplex capture, paralleling the BRCA2 PhePP motif and revealing a shared interaction logic among DMC1 mediators.","evidence":"Co-IP, motif mutagenesis, in vitro D-loop/synaptic complex assays, mouse spermatocyte colocalization","pmids":["21307306","21903585"],"confidence":"High","gaps":["In vivo requirement for the WVPP-DMC1 contact during meiosis untested"]},{"year":2012,"claim":"Separated the meiotic roles of the two recombinases, showing DMC1's joint-molecule activity drives meiotic recombination while RAD51 functions as a DMC1 accessory whose own JM activity is dispensable.","evidence":"Separation-of-function alleles in yeast plus in vitro biochemistry; DMC1-Tid1 vs RAD51-Rad54 pairing specificity","pmids":["22955832","22761450"],"confidence":"High","gaps":["Molecular basis of interhomolog bias incompletely defined"]},{"year":2016,"claim":"Showed full-length BRCA2 acts as a genuine DMC1 mediator and defined BRC-repeat specialization, with BRC repeats 6-8 binding DMC1 preferentially and stimulating filament formation and strand exchange.","evidence":"In vitro reconstitution with purified full-length BRCA2 and BRC-repeat panel","pmids":["26976601"],"confidence":"High","gaps":["Coordination of BRCA2 between RAD51 and DMC1 in cells not resolved"]},{"year":2019,"claim":"Pinpointed the molecular origin of DMC1's hallmark mismatch tolerance to a small set of DMC1-specific residues, since transplanting them confers tolerance on RAD51 and removing them abolishes it.","evidence":"Chimeric mutagenesis, in vitro strand exchange with mismatched substrates, yeast and C. elegans genetics; full six-protein reconstitution","pmids":["31371435","30462332"],"confidence":"High","gaps":["Physiological consequence of mismatch tolerance for crossover patterning not directly measured"]},{"year":2020,"claim":"Demonstrated in vivo that DMC1 binds adjacent to the break end while RAD51 binds distally, settling that DMC1 performs the strand-exchange step in mammalian meiosis, and identified BRME1 as a regulator of recombinase loading.","evidence":"Allele-specific ChIP-seq and super-resolution microscopy in hybrid mice; BRME1 conditional KO with co-IP","pmids":["32610038","32460033"],"confidence":"High","gaps":["BRME1 finding is Medium-confidence single-lab","Spatial separation mechanism on resected DNA not fully explained"]},{"year":2021,"claim":"Resolved the structural basis of DMC1's mismatch tolerance and crossover bias by cryo-EM, localizing Loop1/Loop2 differences (Gln244, Pro274/Gly275 vs RAD51) that form an open triplet gate, and demonstrating fidelity swaps by residue exchange.","evidence":"Cryo-EM of pre/postsynaptic complexes, MD simulation, smFRET, mutagenesis with strand-exchange assays","pmids":["34871438","33446654"],"confidence":"High","gaps":["How tolerance is balanced against fidelity during homology search in vivo unresolved"]},{"year":2023,"claim":"Identified FIGNL1 as a disassembly factor for DMC1 filaments, showing that filament turnover is actively required for proper synapsis and DSB repair, completing the load/activate/remove cycle.","evidence":"In vitro filament disassembly with purified FIGNL1; conditional KO mouse with cytology","pmids":["37891173"],"confidence":"High","gaps":["Selectivity of FIGNL1 for DMC1 vs RAD51 in vivo not separated"]},{"year":null,"claim":"How the full accessory network (mediators, translocases, anti-recombinase inhibition, and post-translational modifications such as SUMOylation) is temporally coordinated in vivo to bias DMC1 intermediates toward interhomolog crossovers remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated in vivo timeline of mediator action","Functional consequence of DMC1 SUMOylation in mammals untested","Regulation linking filament turnover to crossover designation unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[5,7,26,34,43]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,6,15]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[5,13,14]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[7,23,31]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,3]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[3,40]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[8,19,40]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[5,7,40]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,2,22]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0]}],"complexes":["DMC1-Mei5-Sae3 complex","DMC1-ssDNA presynaptic filament"],"partners":["RAD51","HOP2","MND1","BRCA2","RAD51AP1","TID1/RDH54","MEI5","FIGNL1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IV36","full_name":"Protein HID1","aliases":["Down-regulated in multiple cancers 1","HID1 domain-containing protein","Protein hid-1 homolog"],"length_aa":788,"mass_kda":88.7,"function":"May play an important role in the development of cancers in a broad range of tissues","subcellular_location":"Cytoplasm; Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/Q8IV36/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DMC1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DMC1","total_profiled":1310},"omim":[{"mim_id":"621430","title":"FIGNL1-INTERACTING REGULATOR OF RECOMBINATION AND MITOSIS; FIRRM","url":"https://www.omim.org/entry/621430"},{"mim_id":"621002","title":"PREMATURE OVARIAN FAILURE 25; POF25","url":"https://www.omim.org/entry/621002"},{"mim_id":"621001","title":"SPERMATOGENIC FAILURE 96; SPGF96","url":"https://www.omim.org/entry/621001"},{"mim_id":"620686","title":"PREMATURE OVARIAN FAILURE 23; POF23","url":"https://www.omim.org/entry/620686"},{"mim_id":"620547","title":"SPERMATOGENIC FAILURE 88; SPGF88","url":"https://www.omim.org/entry/620547"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"testis","ntpm":11.0}],"url":"https://www.proteinatlas.org/search/DMC1"},"hgnc":{"alias_symbol":["LIM15"],"prev_symbol":[]},"alphafold":{"accession":"Q8IV36","domains":[{"cath_id":"1.25.40","chopping":"393-604_628-642_681-748","consensus_level":"medium","plddt":88.8814,"start":393,"end":748}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IV36","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IV36-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IV36-F1-predicted_aligned_error_v6.png","plddt_mean":85.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DMC1","jax_strain_url":"https://www.jax.org/strain/search?query=DMC1"},"sequence":{"accession":"Q8IV36","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IV36.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IV36/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IV36"}},"corpus_meta":[{"pmid":"1581960","id":"PMC_1581960","title":"DMC1: 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dmc1 mutants accumulate double-strand break recombination intermediates and arrest in late meiotic prophase.\",\n      \"method\": \"Genetic analysis, mutant phenotyping, molecular cloning\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — foundational genetic loss-of-function study with multiple defined phenotypic readouts, independently replicated across many subsequent studies\",\n      \"pmids\": [\"1581960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Dmc1 and Rad51 colocalize to as many as 64 punctate sites (foci) in spread meiotic nuclei, likely representing recombination intermediates; Dmc1 complexes fail to form in rad51 mutants, while Rad51 complexes persist indefinitely in dmc1 mutants, indicating Rad51 is required upstream of Dmc1 complex formation; Zip1 protein promotes dissociation of Dmc1 complexes.\",\n      \"method\": \"Immunostaining of spread meiotic nuclei; genetic epistasis with rad51, dmc1, zip1 mutants\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct cytological localization with functional epistasis, replicated by subsequent studies\",\n      \"pmids\": [\"7528104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Mouse Dmc1 is required for homologous chromosome synapsis during meiosis in both sexes; Dmc1-null males and females are sterile, with meiotic arrest at early zygotene and failure of homolog pairing despite axial element formation.\",\n      \"method\": \"Targeted gene disruption (knockout mouse); cytological analysis of spermatocytes\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent knockout mouse studies (PMIDs 9660953 and 9660954) with identical phenotypic conclusions\",\n      \"pmids\": [\"9660953\", \"9660954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Mouse RAD51 and DMC1 colocalize on meiotic chromosome cores at early prophase I and interact with each other and with the chromosome core component SCP3 (COR1) as shown by two-hybrid and in vitro binding assays, suggesting formation of a multiprotein recombination complex on meiotic chromosome cores.\",\n      \"method\": \"Immunofluorescence, immunoelectron microscopy, yeast two-hybrid, in vitro binding assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal localization plus two-hybrid and in vitro binding; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"10525529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human Dmc1 (hDmc1) forms octameric rings rather than helical filaments (unlike RecA and Rad51); DNA binds in the central channel of the ring, representing the likely active form.\",\n      \"method\": \"Electron microscopy (structural analysis of purified hDmc1 protein)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct structural EM of purified protein; single lab but later confirmed by crystal structure\",\n      \"pmids\": [\"10485886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Purified S. cerevisiae Dmc1 has weak DNA-dependent ATPase activity, binds ssDNA and dsDNA cooperatively, renatures linearized plasmid DNA, and catalyzes strand assimilation of ssDNA into homologous supercoiled duplex DNA in an ATP-dependent or ATP-independent (AMP-PNP-supported) reaction.\",\n      \"method\": \"Protein purification, ATPase assay, EMSA, strand assimilation/renaturation assay in vitro\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro biochemical reconstitution with purified protein, multiple orthogonal enzymatic assays\",\n      \"pmids\": [\"11551925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of full-length human Dmc1 octameric ring resolved; the monomeric structure closely resembles Rad51 and archaeal Rad51; an additional hydrogen bonding interaction at the polymer interface (not present in Rad51) stabilizes the octameric ring over helical filaments. Mutagenesis identified inner and outer basic patches: the inner patch binds both ssDNA and dsDNA, while the outer patch binds ssDNA, suggesting a model for DNA interaction during homologous pairing.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, DNA binding assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis with functional validation of DNA binding\",\n      \"pmids\": [\"15125839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human Dmc1 mediates ATP-dependent DNA strand exchange over at least several thousand base pairs between paired DNA substrates; the reaction requires RPA and initiates through nucleation of hDmc1 onto ssDNA to form a helical nucleoprotein filament.\",\n      \"method\": \"In vitro strand exchange assay with purified proteins; electron microscopy of nucleoprotein filaments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of strand exchange with purified human protein, EM structural validation, multiple substrate conditions tested\",\n      \"pmids\": [\"15164066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Meiosis-specific proteins Mei5 and Sae3 form a ternary complex with Dmc1 and are required for assembly of Dmc1 (but not Rad51) on meiotic chromosomes and at recombination hot spots; their recruitment requires Rad51; the Dmc1-Mei5-Sae3 complex is integrated onto Rad51 ensembles.\",\n      \"method\": \"Genetic analysis (mei5, sae3 mutants), chromatin immunoprecipitation, immunostaining of meiotic chromosomes, co-immunoprecipitation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus ChIP plus cytology plus genetic epistasis; multiple orthogonal methods\",\n      \"pmids\": [\"15620352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The Hop2-Mnd1 heterodimer stimulates the strand assimilation activity of Dmc1 in vitro and functions in the same genetic pathway as HOP2, MND1, and DMC1 for homologous chromosome juxtaposition in S. cerevisiae; Hop2 and Mnd1 form a stable heterodimer with higher affinity for dsDNA than ssDNA.\",\n      \"method\": \"In vitro strand assimilation assay, double-mutant epistasis analysis, protein-protein interaction assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with purified proteins plus genetic epistasis\",\n      \"pmids\": [\"15249670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human MSH4 physically interacts with both RAD51 and DMC1 in biochemical pulldown assays, and a subset of MSH4 foci colocalize with DMC1/RAD51 complexes on mouse meiotic chromosomes.\",\n      \"method\": \"In vitro binding assay (pulldown), immunolocalization on mouse meiotic chromosomes\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single pulldown plus colocalization; two orthogonal methods in a single lab\",\n      \"pmids\": [\"15489243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mouse HOP2/TBPIP stimulates DMC1-mediated homologous pairing in vitro but does not stimulate RAD51; the stimulatory effect requires HOP2 to first bind dsDNA; the C-terminal basic region of HOP2 is required for DNA binding and for pairing stimulation.\",\n      \"method\": \"In vitro homologous pairing assay with purified proteins, deletion mutagenesis, DNA binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, mutagenesis revealing mechanistic determinants\",\n      \"pmids\": [\"15192114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mouse Hop2-Mnd1 heterodimer physically interacts with both Rad51 and Dmc1 recombinases and stimulates their D-loop/strand invasion activity up to 35-fold; Hop2-Mnd1 stimulates Dmc1 by stabilizing ssDNA nucleoprotein complexes and facilitating dsDNA capture by the Dmc1-ssDNA filament.\",\n      \"method\": \"D-loop assay, strand invasion assay, co-immunoprecipitation, protein-protein interaction assays with purified proteins\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple mechanistic steps defined\",\n      \"pmids\": [\"15834424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ca2+ stimulates the DNA strand exchange activity of human Dmc1 through conformational changes that stabilize hDmc1-ssDNA filament complexes; unlike for hRad51, Ca2+ stimulation of hDmc1 does not act primarily through inhibition of ATPase activity (hDmc1 does not self-convert into a stable ADP-bound complex).\",\n      \"method\": \"In vitro strand exchange assay, ATPase assay, electron microscopy of nucleoprotein filaments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with mechanistic dissection; multiple assays\",\n      \"pmids\": [\"15917244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ca2+ enables yeast Dmc1 to form regular helical filaments on ssDNA and activates its strand assimilation activity; Ca2+ increases Dmc1's affinity for ATP and reduces DNA-dependent ATPase activity, supporting the view that ATP binding (not hydrolysis) is required for functional filament structure.\",\n      \"method\": \"In vitro strand assimilation assay, ATPase assay, electron microscopy of Dmc1-ssDNA filaments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical and structural analysis with mechanistic dissection\",\n      \"pmids\": [\"16204247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The N-terminal domain (residues 1–81) of human DMC1 is required for octamer formation; deletion of this domain (DMC1-82-340) produces a heptamer and abolishes both ssDNA and dsDNA binding activities.\",\n      \"method\": \"Analytical ultracentrifugation, DNA binding assays, deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with quantitative structural and functional analyses\",\n      \"pmids\": [\"15917243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The N-terminal domain of DMC1 (residues 1–81) was found to be highly flexible in the octameric ring crystal structure, in contrast to the Rad51 N-terminal domain which makes specific contacts in the helical filament; this structural difference may explain distinct oligomeric forms.\",\n      \"method\": \"X-ray crystallography (crystal structure of octameric ring) — this finding is coincident with PMID 15125839 but specifically noted for N-terminal domain\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural observation from crystal structure, mechanistic implication supported by mutagenesis in same paper\",\n      \"pmids\": [\"15917243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mei5-Sae3 complex preferentially binds ssDNA, relieves RPA-imposed inhibition of Dmc1's strand assimilation and DNA binding activities, and physically interacts with RPA; Mei5-Sae3 acts as a mediator of Dmc1 assembly onto RPA-coated ssDNA.\",\n      \"method\": \"In vitro strand assimilation assay, DNA binding assay, protein-protein interaction assay with purified proteins\",\n      \"journal\": \"Genetics (Tsubouchi & Roeder 2004 PMID 15579681) / Journal of Biological Chemistry (Ferrari et al. 2009 PMID 19270307)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with purified proteins demonstrating mediator activity; confirmed by two independent studies\",\n      \"pmids\": [\"15579681\", \"19270307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The S. pombe Swi5-Sfr1 complex, at substoichiometric concentrations, stimulates Dmc1-mediated strand exchange on long DNA substrates; the complex overcomes RPA-mediated inhibition of Dmc1, increases the amount of Dmc1 bound to ssDNA, and preferentially stimulates ssDNA-dependent ATPase of Rad51.\",\n      \"method\": \"In vitro strand exchange assay, ssDNA-binding assay, ATPase assay with purified proteins\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple biochemical assays\",\n      \"pmids\": [\"16921379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Tid1/Rdh54 promotes dissociation of Dmc1 from nonrecombinogenic (non-DSB) chromatin sites; an activity shared by Tid1 and Rad54 is required for normal assembly of Dmc1 at DSB sites; Tid1's DNA translocase ATPase activity mediates Dmc1 removal from nonproductive chromatin.\",\n      \"method\": \"Chromatin immunoprecipitation, genetic analysis in dmc1, tid1, rad54 mutants\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP with genetic epistasis, mechanistic model supported by multiple mutant combinations\",\n      \"pmids\": [\"16980587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human Rad54B stabilizes the Dmc1-ssDNA nucleoprotein complex and thereby enhances Dmc1-mediated DNA strand exchange activity in vitro.\",\n      \"method\": \"In vitro DNA strand exchange assay, ssDNA binding assay with purified proteins\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution; single lab, two orthogonal assays\",\n      \"pmids\": [\"16945962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human BRCA2 directly binds DMC1 via a distinct 26-amino-acid region (residues 2386–2411, the PhePP motif, critical residues Phe2406, Pro2408, Pro2409) that is separate from the RAD51 interaction domain; BRCA2 thus coordinates interactions with both recombinases at meiosis through distinct binding sites.\",\n      \"method\": \"Pulldown/binding assays with truncation and point mutants of BRCA2; co-immunoprecipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays with mutagenesis defining minimal interaction domain; multiple orthogonal methods\",\n      \"pmids\": [\"17541404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A missense mutation in the L2 DNA-binding domain of mouse Dmc1 (Dmc1Mei11) abolishes strand invasion activity; in male heterozygotes, meiosis arrests in pachynema with incomplete synapsis and no crossing-over; female heterozygotes show reduced oocyte pool but partially compensate, revealing a sex difference in DMC1 dependence.\",\n      \"method\": \"Mouse mutagenesis screen, in vitro strand invasion assay with mutant protein, cytological analysis of meiosis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — dominant allele with defined in vitro activity loss plus in vivo cytological phenotype\",\n      \"pmids\": [\"17425408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rad51 and Dmc1 (from both human and budding yeast) form essentially identical nucleoprotein filaments with respect to persistence length, helical pitch, filament diameter, DNA base pairs per helical turn, and handedness; differences in meiotic function are therefore likely due to distinct accessory proteins rather than intrinsic filament structural differences.\",\n      \"method\": \"Comparative electron microscopy of filaments from both human and yeast proteins; quantitative structural analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct structural comparison of purified proteins by EM with quantitative parameters\",\n      \"pmids\": [\"18535008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of human DMC1-M200V variant in octameric ring form shows reduced protein stability; biochemical assays demonstrate the variant is moderately defective in in vitro recombination reactions; the corresponding M194V mutation in S. pombe dmc1 significantly decreases meiotic homologous recombination frequency.\",\n      \"method\": \"X-ray crystallography, in vitro recombination assay, genetic analysis in fission yeast\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biochemical assay plus genetic validation across organisms\",\n      \"pmids\": [\"18566005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Purified S. pombe Rdh54 forms a complex with Dmc1 and enhances Dmc1 recombinase activity; Rdh54 also mediates efficient removal of Dmc1 from dsDNA in an ATPase-dependent manner, preventing nonproductive Dmc1-chromatin interactions.\",\n      \"method\": \"Co-immunoprecipitation with purified proteins, in vitro recombinase activity assay, dsDNA dissociation assay, ATPase mutant analysis\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, multiple functional assays including ATPase-dead mutant\",\n      \"pmids\": [\"19028606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DMC1-driven D-loops are substantially more resistant to dissociation by branch-migration proteins (e.g., RAD54) than RAD51-driven D-loops; this resistance may channel DMC1 recombination intermediates toward the double-strand break repair pathway (crossovers) rather than synthesis-dependent strand annealing (non-crossovers).\",\n      \"method\": \"In vitro D-loop formation and dissociation assay with purified human DMC1, RAD51, and RAD54 proteins\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified human proteins, direct mechanistic comparison\",\n      \"pmids\": [\"21151113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RAD51AP1 physically associates with DMC1 via a conserved WVPP motif (distinct from its RAD51-interaction domain) and stimulates DMC1-mediated D-loop formation by enhancing the ability of the DMC1 presynaptic filament to capture duplex DNA and assemble the synaptic complex; RAD51AP1 colocalizes with a subset of DMC1 foci in mouse spermatocytes.\",\n      \"method\": \"Co-immunoprecipitation, in vitro D-loop assay, synaptic complex assay with purified proteins, immunofluorescence on mouse spermatocytes\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with mutagenesis plus in vivo colocalization; multiple orthogonal methods\",\n      \"pmids\": [\"21307306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RAD51AP1 interacts with DMC1 through a conserved WVPP motif in RAD51AP1 that is critical for DMC1 interaction but dispensable for RAD51 association; this motif is similar to the FVPP (PhePP) motif in BRCA2 that mediates DMC1 interaction.\",\n      \"method\": \"Truncation and point-mutation mapping of RAD51AP1 interaction sites; co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with defined mutagenesis; single lab\",\n      \"pmids\": [\"21903585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Using a separation-of-function Rad51 mutant retaining filament-forming but not joint-molecule (JM) activity, Rad51's JM activity is shown to be fully dispensable for meiotic recombination, while the equivalent Dmc1 mutation causes profound recombination defect; Dmc1's JM activity alone is responsible for meiotic recombination. Biochemical evidence shows Rad51 acts with Mei5-Sae3 as a Dmc1 accessory factor.\",\n      \"method\": \"Separation-of-function mutant analysis in yeast, in vitro biochemical assay of strand exchange activity\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genetic separation-of-function alleles combined with biochemical reconstitution; rigorous functional dissection\",\n      \"pmids\": [\"22955832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Purified Dmc1 and Tid1 physically interact and Tid1 stimulates Dmc1-mediated joint molecule formation in vitro; under conditions optimal for Dmc1, Rad51 is specifically stimulated by Rad54 (not Tid1), establishing Dmc1-Tid1 and Rad51-Rad54 as functionally specific pairs; Dmc1-Tid1 promotes interhomolog while Rad51-Rad54 promotes intersister strand exchange.\",\n      \"method\": \"In vitro joint molecule/D-loop assay, physical interaction assay with purified proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, specificity demonstrated by comparative functional assays\",\n      \"pmids\": [\"22761450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Purified S. cerevisiae Dmc1 (when ATP is included during purification to prevent aggregation) forms D-loops and responds to accessory factors Rad54 and Rdh54; EM reconstruction reveals the ScDmc1-ssDNA nucleoprotein filament has 6.5 protomers per turn with a pitch of ~106 Å.\",\n      \"method\": \"Protein purification, D-loop assay, negative-stain electron microscopy with helical reconstruction\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with structural EM characterization\",\n      \"pmids\": [\"23769192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Budding yeast Hop2-Mnd1 (using the newly identified full-length ORF including exon 3) stimulates ScDmc1 D-loop activity up to 30-fold (much greater than previously reported 3-fold); stimulation requires physiological concentrations of Ca2+ (with Mg2+ also present); stimulation of Dmc1 by Hop2-Mnd1 is specific to Dmc1 and does not extend to Rad51 in budding yeast.\",\n      \"method\": \"In vitro D-loop assay with purified proteins, Ca2+/Mg2+ titration, order-of-addition experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with corrected protein sequence, multiple mechanistic conditions tested\",\n      \"pmids\": [\"24798326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Distinct DNA-binding activities of Hop2-Mnd1 mediate either stabilization of the RAD51-ssDNA presynaptic filament or stimulation of the homologous DNA pairing reaction; ATP enhances the interaction between Hop2-Mnd1 and RAD51; both Hop2 and Mnd1 C-terminal regions are required for RAD51 (and DMC1) interaction; the HOP2 p.del201Glu mutation found in XX ovarian dysgenesis diminishes functional synergy with both RAD51 and DMC1.\",\n      \"method\": \"In vitro D-loop assay, presynaptic filament stabilization assay, co-immunoprecipitation with mutant proteins, pulldown with purified proteins\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis and disease variant; multiple orthogonal biochemical assays\",\n      \"pmids\": [\"25820426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dmc1-mediated strand exchange is sensitive to mismatch location, type, and distribution; mismatches near the 5' end of the initiating strand impede strand exchange dramatically, while 3'-end mismatches have little effect; Hop2-Mnd1 stimulates Dmc1-catalyzed strand exchange on homologous DNA and with a single mismatch.\",\n      \"method\": \"FRET-based strand exchange assay with defined mismatch-containing oligonucleotides and purified Dmc1/Hop2-Mnd1\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with systematic mismatch panel, quantitative mechanistic analysis\",\n      \"pmids\": [\"26709229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Human BRCA2 BRC repeats interact directly with DMC1; most BRC repeats stimulate DMC1 joint molecule formation; BRC repeats 1-3 bind RAD51 more tightly, while BRC repeats 6-8 bind DMC1 more tightly; BRC repeat stimulation of DMC1 operates by enhancing DMC1-ssDNA complex formation; full-length BRCA2 stimulates DMC1-mediated DNA strand exchange between RPA-ssDNA complexes and duplex DNA, acting as a mediator of DMC1.\",\n      \"method\": \"In vitro D-loop/joint molecule assay with purified proteins, BRC repeat binding assays, full-length BRCA2 biochemical reconstitution\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified full-length BRCA2 and DMC1, BRC repeat mutagenesis panel, multiple assays\",\n      \"pmids\": [\"26976601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Meiosis-specific recombinase Dmc1 is a potent inhibitor of the Srs2 anti-recombinase; Dmc1 inhibits Srs2 ATP hydrolysis, preventing Srs2 from undergoing ATP-dependent translocation on Dmc1-bound recombination intermediates, thereby protecting crossover intermediates from dissociation during meiosis.\",\n      \"method\": \"Biochemical assay (ATPase), single-molecule imaging of Srs2 translocation on Dmc1 filaments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical plus single-molecule reconstitution with defined mechanistic readout\",\n      \"pmids\": [\"30301803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rad51 and Dmc1 spontaneously self-segregate within mixed presynaptic filaments without requiring other recombination accessory proteins; Dmc1 stabilizes adjacent Rad51 filaments through cross-talk between the two recombinases.\",\n      \"method\": \"Single-molecule imaging (total internal reflection fluorescence microscopy) of fluorescently labeled Rad51 and Dmc1\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — single-molecule direct visualization of filament composition dynamics with purified proteins\",\n      \"pmids\": [\"29382724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In vitro reconstitution of Dmc1 recombination using six purified S. cerevisiae proteins (Dmc1, RPA, Rad51, Rdh54/Tid1, Mei5-Sae3, Hop2-Mnd1) shows each accessory protein contributes to D-loop formation; RPA plays multiple stimulatory roles including overcoming inhibitory ssDNA secondary structure, elongating D-loops, and limiting inhibitory interactions of Hop2-Mnd1 and Rdh54/Tid1 with the Dmc1-ssDNA filament; Rad51 and Dmc1 directly interact in a manner enhanced by Mei5-Sae3.\",\n      \"method\": \"In vitro D-loop reconstitution assay with six purified proteins; direct protein-protein interaction assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — comprehensive biochemical reconstitution with six purified proteins, systematic dissection of each component's role\",\n      \"pmids\": [\"30462332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Three Dmc1 lineage-specific amino acids (not present in Rad51) are responsible for Dmc1's ability to stabilize mismatch-containing heteroduplex DNA base triplets; chimeric Rad51 mutants harboring Dmc1-specific amino acids gain mismatch tolerance, while Dmc1 mutants with Rad51-specific amino acids lose it.\",\n      \"method\": \"Chimeric protein mutagenesis, in vitro strand exchange assay with mismatched substrates, genetic analysis in yeast and C. elegans\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — chimeric mutagenesis with in vitro biochemical validation and in vivo genetic confirmation\",\n      \"pmids\": [\"31371435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In vivo mapping in a hybrid mouse shows DMC1 binds near the DSB site on ssDNA, while RAD51 binds away from the break; these data support DMC1 (not RAD51) performing strand exchange in mammalian meiosis.\",\n      \"method\": \"Chromatin immunoprecipitation sequencing (ChIP-seq) on individual homologous chromosomes in hybrid mouse; super-resolution microscopy\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — high-resolution in vivo ChIP-seq with allele-specific resolution plus super-resolution microscopy; rigorous multi-method approach\",\n      \"pmids\": [\"32610038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"C19orf57/BRME1 associates with BRCA2 and MEILB2/HSF2BP (which recruit recombinases to DSBs); BRME1 knockout in mouse spermatocytes delays removal of ssDNA-binding proteins from DSB sites and impairs loading of RAD51 and DMC1 onto resected ssDNA, demonstrating BRME1 modulates localization of recombinases to meiotic DSB sites.\",\n      \"method\": \"Co-immunoprecipitation, conditional knockout mouse, immunostaining of spermatocytes\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus KO mouse with specific immunostaining readout; single lab\",\n      \"pmids\": [\"32460033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ScDmc1 nucleoprotein filaments are less stable than ScRad51 filaments due to a kinetically reduced nucleation step arising from lower ssDNA affinity; ScDmc1 nucleates preferentially at ssDNA-dsDNA junctions with 5'-to-3' polarity extension; short ScRad51 patches stimulate ScDmc1 nucleation through direct protein-protein interaction between ScDmc1 and ScRad51, but not with EcRecA.\",\n      \"method\": \"Single-molecule tethered particle motion experiments, in vitro filament assembly assay, pulldown assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — single-molecule real-time kinetics plus biochemical pulldown; multiple orthogonal approaches\",\n      \"pmids\": [\"32404423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of human Dmc1-DNA and Rad51-DNA complexes reveal that the major conformational differences are in their Loop2 regions; V273 and D274 in RAD51 (corresponding to P274 and G275 in DMC1) are key residues controlling mismatch tolerance during strand exchange; replacing Loop2 residues with Rad51 counterparts enhances DMC1 fidelity and vice versa.\",\n      \"method\": \"Cryo-EM structure determination, molecular dynamics simulation, single-molecule FRET, site-directed mutagenesis with in vitro strand exchange assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structures plus MD simulation plus smFRET plus mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"34871438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of DMC1 presynaptic and postsynaptic complexes show Loop1 Gln244 (Met243 in RAD51) stabilizes DNA backbone and Loop2 Pro274/Gly275 (Val273/Asp274 in RAD51) form an open 'triplet gate' for mismatch tolerance; replacing Loop1 or Loop2 residues of DMC1 with RAD51 counterparts enhances DMC1 fidelity, confirming the structural basis for distinctive mismatch tolerance.\",\n      \"method\": \"Cryo-EM, molecular dynamics simulation, site-directed mutagenesis with in vitro functional assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM plus MD simulation plus mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"33446654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Arabidopsis, RAD51 physically interacts with the SMC5/6 complex and restrains SMC5/6 from inhibiting DMC1 localization to meiotic chromosomes; loss of SMC5/6 partially suppresses rad51 knockout sterility in a DMC1-dependent manner.\",\n      \"method\": \"Arabidopsis genetics (double knockout suppressor analysis), immunostaining, co-immunoprecipitation\",\n      \"journal\": \"The Plant cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic suppressor epistasis plus co-IP plus cytology; multiple methods, plant ortholog\",\n      \"pmids\": [\"34009315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FIGNL1 AAA+ ATPase dismantles RAD51 and DMC1 filaments on both ssDNA and dsDNA in vitro; conditional knockout of FIGNL1 in mouse germline causes accumulation of RAD51/DMC1 on meiotic chromosomes and in pre-meiotic S-phase (independently of meiotic DSBs), defective chromosome synapsis, and impaired meiotic DSB repair.\",\n      \"method\": \"Conditional knockout mouse, immunostaining of spermatocytes, in vitro filament disassembly assay with purified FIGNL1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution plus conditional KO mouse with multiple cytological readouts\",\n      \"pmids\": [\"37891173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Coprinus cinereus, Lim15/Dmc1 (CcLim15) is sumoylated during meiosis via interaction with the SUMO E2 conjugating enzyme Ubc9; Ubc9 binds the C-terminus (residues 105–347) of CcLim15 containing the ATPase domain; CcLim15 and CcUbc9 colocalize in meiotic nuclei from leptotene to early pachytene.\",\n      \"method\": \"In vitro protein-protein interaction assay, co-immunoprecipitation, immunocytochemistry, in vivo and in vitro sumoylation assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus in vitro sumoylation assay plus colocalization; fungal ortholog, multiple methods\",\n      \"pmids\": [\"16879611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In Coprinus cinereus, DNA topoisomerase II (CcTopII) specifically interacts with CcLim15/Dmc1 in vitro and in vivo; CcLim15 activates the relaxation/catenation activity of CcTopII in vitro; CcTopII suppresses CcLim15-dependent strand transfer; CcTopII enhances CcLim15 DNA-dependent ATPase activity while CcLim15 inhibits CcTopII ATPase; the two proteins colocalize on meiotic chromosomes from leptotene to zygotene.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, relaxation/strand transfer/ATPase assays, immunolocalization\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus multiple functional assays in vitro plus colocalization; fungal ortholog, single lab\",\n      \"pmids\": [\"16221977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mei1 is epistatic to Dmc1 in mouse meiosis; double Dmc1-/-Mei1-/- mutant phenotype is identical to Mei1-/- alone, positioning Mei1 upstream of Dmc1 in the meiotic recombination pathway (consistent with Mei1 being required for DSB formation upstream of Dmc1-dependent repair).\",\n      \"method\": \"Double knockout mouse epistasis analysis; oogenesis phenotype comparison\",\n      \"journal\": \"Chromosoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic epistasis in mouse double mutants; single lab\",\n      \"pmids\": [\"15928951\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DMC1 is a meiosis-specific RecA/Rad51-family recombinase that forms helical nucleoprotein filaments (and also octameric rings) on ssDNA generated at programmed DSBs; these filaments catalyze ATP-dependent homologous DNA strand exchange and D-loop formation with a distinctive mismatch tolerance conferred by Loop1/Loop2 residues; DMC1 acts as the primary strand-exchange enzyme in meiosis (with RAD51 serving as an accessory factor via Mei5-Sae3 and direct filament interactions), is specifically recruited near DSB ends in vivo, produces D-loops that are intrinsically resistant to branch-migration dissociation (promoting crossovers), inhibits the Srs2 anti-recombinase, and is regulated by a network of accessory factors including HOP2-MND1, RAD51AP1, BRCA2, Mei5-Sae3, Tid1/Rdh54, and FIGNL1, as well as by post-translational modifications such as SUMO conjugation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DMC1 is a meiosis-specific RecA/RAD51-family recombinase that catalyzes the homologous strand-exchange reaction underlying meiotic recombination, and its loss arrests cells in meiotic prophase with unrepaired double-strand-break intermediates and failed homolog synapsis [#0, #2]. Mechanistically, DMC1 assembles on resected single-stranded DNA at programmed DSBs—in mammalian meiosis it binds near the break end while RAD51 occupies positions away from the break, identifying DMC1 as the principal strand-exchange enzyme in vivo [#40]. Purified DMC1 binds ssDNA and dsDNA, possesses weak DNA-dependent ATPase activity, and performs ATP-dependent strand exchange and D-loop formation through a presynaptic nucleoprotein filament; ATP binding rather than hydrolysis supports the active filament, and Ca2+ stabilizes it [#5, #7, #13, #14]. Although human DMC1 can be captured as an octameric ring stabilized by an N-terminal-domain interface absent in RAD51, the functional filament is helical and structurally near-identical to RAD51, so its distinctive meiotic behavior arises from sequence-specific features and accessory factors rather than gross filament architecture [#4, #6, #15, #23]. A defining property is mismatch tolerance during strand exchange, conferred by DMC1-specific Loop1/Loop2 residues (Gln244, Pro274/Gly275) that form an open 'triplet gate' permitting heteroduplex with mismatches; transplanting these residues between DMC1 and RAD51 swaps their fidelity [#39, #43, #44]. DMC1-generated D-loops are intrinsically resistant to branch-migration dissociation and DMC1 inhibits the Srs2 anti-recombinase, properties that protect joint molecules and channel intermediates toward crossover formation [#26, #36]. DMC1 activity is governed by a network of accessory factors: HOP2-MND1 stimulates pairing by stabilizing the presynaptic filament and promoting duplex capture, Mei5-Sae3 and Swi5-Sfr1 relieve RPA inhibition and mediate filament assembly, BRCA2 and RAD51AP1 act as mediators via DMC1-specific motifs (the BRCA2 PhePP and RAD51AP1 WVPP motifs), Tid1/Rdh54 enhances joint-molecule formation while clearing DMC1 from nonproductive chromatin, and FIGNL1 dismantles DMC1 filaments [#9, #12, #17, #18, #21, #27, #35, #30, #19, #46]. RAD51 itself functions partly as a DMC1 accessory factor whose joint-molecule activity is dispensable for meiotic recombination, since DMC1's strand-exchange activity alone drives the process [#29].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established that meiotic recombination requires a dedicated, meiosis-specific RecA-like enzyme, defining DMC1 as a core factor whose absence blocks reciprocal recombination and prophase progression.\",\n      \"evidence\": \"Genetic loss-of-function and mutant phenotyping in budding yeast\",\n      \"pmids\": [\"1581960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No biochemical activity demonstrated\", \"Relationship to RAD51 unresolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Placed DMC1 in an ordered relationship with RAD51 at recombination sites by showing DMC1 focus formation depends on RAD51, framing the two recombinases as cooperating but distinct.\",\n      \"evidence\": \"Immunostaining of spread meiotic nuclei with rad51/dmc1/zip1 epistasis\",\n      \"pmids\": [\"7528104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of co-dependence unknown\", \"Whether colocalization reflects mixed filaments untested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated DMC1 is essential for homolog synapsis and fertility in a mammal, establishing conservation of its meiotic role and showing axial elements form without DMC1 but pairing fails.\",\n      \"evidence\": \"Dmc1-null knockout mice, cytology of spermatocytes/oocytes\",\n      \"pmids\": [\"9660953\", \"9660954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism in vivo not addressed\", \"Sex differences not yet dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Reconstituted DMC1 as a bona fide ATP-dependent strand-exchange recombinase that nucleates a helical filament on ssDNA and requires RPA, defining its core enzymatic activity.\",\n      \"evidence\": \"In vitro strand exchange and EM with purified human protein; earlier yeast strand-assimilation biochemistry\",\n      \"pmids\": [\"15164066\", \"11551925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo filament composition not addressed\", \"Crossover-bias mechanism unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the structural paradox between DMC1's octameric ring and active filament by crystallizing the human octamer, mapping DNA-binding patches, and tracing ring stabilization to an N-terminal interface absent in RAD51.\",\n      \"evidence\": \"X-ray crystallography, mutagenesis, DNA-binding and oligomerization assays\",\n      \"pmids\": [\"15125839\", \"15917243\", \"15917244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of octamer vs filament unresolved\", \"Crystal lacked DNA-bound filament\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified Mei5-Sae3 and HOP2-MND1 as mediators that overcome RPA inhibition and stimulate DMC1 filament assembly and pairing, explaining how DMC1 is loaded and activated at DSBs.\",\n      \"evidence\": \"In vitro reconstitution, DNA-binding, ChIP, cytology and genetics across yeast and mouse orthologs\",\n      \"pmids\": [\"15620352\", \"15579681\", \"19270307\", \"15192114\", \"15834424\", \"15249670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry on chromatin in vivo unclear\", \"Order of mediator action incompletely defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined Tid1/Rdh54 and Rad54B as DMC1 partners that both stimulate recombinase activity and clear DMC1 from nonproductive chromatin, introducing quality-control of filament placement.\",\n      \"evidence\": \"ChIP and genetics; in vitro recombinase, dsDNA-dissociation and ATPase-mutant assays\",\n      \"pmids\": [\"16980587\", \"16945962\", \"16921379\", \"19028606\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How removal is targeted to nonproductive sites mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped a dedicated DMC1-binding site on BRCA2 (the PhePP motif), distinct from its RAD51 site, and a defective L2 DNA-binding allele in mouse, linking specific DMC1 contacts and residues to meiotic strand-invasion function.\",\n      \"evidence\": \"BRCA2 truncation/point-mutant binding assays; mouse Dmc1Mei11 mutant with in vitro activity loss and cytology\",\n      \"pmids\": [\"17541404\", \"17425408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequence of BRCA2-DMC1 disruption alone not isolated\", \"Basis of sex-specific dependence unexplained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided a mechanistic basis for DMC1's pro-crossover function by showing its D-loops resist branch-migration dissociation far better than RAD51 D-loops.\",\n      \"evidence\": \"In vitro D-loop formation/dissociation with purified human DMC1, RAD51, RAD54\",\n      \"pmids\": [\"21151113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct link to crossover vs non-crossover choice in vivo not shown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established RAD51AP1 as a DMC1 mediator acting through a conserved WVPP motif that enhances duplex capture, paralleling the BRCA2 PhePP motif and revealing a shared interaction logic among DMC1 mediators.\",\n      \"evidence\": \"Co-IP, motif mutagenesis, in vitro D-loop/synaptic complex assays, mouse spermatocyte colocalization\",\n      \"pmids\": [\"21307306\", \"21903585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement for the WVPP-DMC1 contact during meiosis untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Separated the meiotic roles of the two recombinases, showing DMC1's joint-molecule activity drives meiotic recombination while RAD51 functions as a DMC1 accessory whose own JM activity is dispensable.\",\n      \"evidence\": \"Separation-of-function alleles in yeast plus in vitro biochemistry; DMC1-Tid1 vs RAD51-Rad54 pairing specificity\",\n      \"pmids\": [\"22955832\", \"22761450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of interhomolog bias incompletely defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed full-length BRCA2 acts as a genuine DMC1 mediator and defined BRC-repeat specialization, with BRC repeats 6-8 binding DMC1 preferentially and stimulating filament formation and strand exchange.\",\n      \"evidence\": \"In vitro reconstitution with purified full-length BRCA2 and BRC-repeat panel\",\n      \"pmids\": [\"26976601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coordination of BRCA2 between RAD51 and DMC1 in cells not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Pinpointed the molecular origin of DMC1's hallmark mismatch tolerance to a small set of DMC1-specific residues, since transplanting them confers tolerance on RAD51 and removing them abolishes it.\",\n      \"evidence\": \"Chimeric mutagenesis, in vitro strand exchange with mismatched substrates, yeast and C. elegans genetics; full six-protein reconstitution\",\n      \"pmids\": [\"31371435\", \"30462332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of mismatch tolerance for crossover patterning not directly measured\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated in vivo that DMC1 binds adjacent to the break end while RAD51 binds distally, settling that DMC1 performs the strand-exchange step in mammalian meiosis, and identified BRME1 as a regulator of recombinase loading.\",\n      \"evidence\": \"Allele-specific ChIP-seq and super-resolution microscopy in hybrid mice; BRME1 conditional KO with co-IP\",\n      \"pmids\": [\"32610038\", \"32460033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"BRME1 finding is Medium-confidence single-lab\", \"Spatial separation mechanism on resected DNA not fully explained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the structural basis of DMC1's mismatch tolerance and crossover bias by cryo-EM, localizing Loop1/Loop2 differences (Gln244, Pro274/Gly275 vs RAD51) that form an open triplet gate, and demonstrating fidelity swaps by residue exchange.\",\n      \"evidence\": \"Cryo-EM of pre/postsynaptic complexes, MD simulation, smFRET, mutagenesis with strand-exchange assays\",\n      \"pmids\": [\"34871438\", \"33446654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How tolerance is balanced against fidelity during homology search in vivo unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified FIGNL1 as a disassembly factor for DMC1 filaments, showing that filament turnover is actively required for proper synapsis and DSB repair, completing the load/activate/remove cycle.\",\n      \"evidence\": \"In vitro filament disassembly with purified FIGNL1; conditional KO mouse with cytology\",\n      \"pmids\": [\"37891173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity of FIGNL1 for DMC1 vs RAD51 in vivo not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the full accessory network (mediators, translocases, anti-recombinase inhibition, and post-translational modifications such as SUMOylation) is temporally coordinated in vivo to bias DMC1 intermediates toward interhomolog crossovers remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated in vivo timeline of mediator action\", \"Functional consequence of DMC1 SUMOylation in mammals untested\", \"Regulation linking filament turnover to crossover designation unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [5, 7, 26, 34, 43]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 6, 15]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [5, 13, 14]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [7, 23, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [3, 40]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [8, 19, 40]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 7, 40]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 2, 22]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\n      \"DMC1-Mei5-Sae3 complex\",\n      \"DMC1-ssDNA presynaptic filament\"\n    ],\n    \"partners\": [\n      \"RAD51\",\n      \"HOP2\",\n      \"MND1\",\n      \"BRCA2\",\n      \"RAD51AP1\",\n      \"TID1/RDH54\",\n      \"MEI5\",\n      \"FIGNL1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}