{"gene":"FANCM","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2007,"finding":"FANCM associates with FAAP24 through its C-terminal region; FAAP24 shares homology with XPF family flap/fork endonucleases and targets FANCM to DNA structures mimicking replication/repair intermediates. FAAP24 is required for normal levels of FANCD2 monoubiquitylation following DNA damage.","method":"Co-immunoprecipitation, siRNA depletion, cellular sensitivity assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional siRNA depletion with defined phenotypic readouts, replicated across multiple labs subsequently","pmids":["17289582"],"is_preprint":false},{"year":2008,"finding":"Purified FANCM binds Holliday junctions and replication forks with high specificity and promotes migration of their junction point in an ATPase-dependent manner; FANCM can dissociate large recombination intermediates via branch migration of Holliday junctions through 2.6 kb of DNA.","method":"In vitro branch migration assay with purified protein, ATPase-defective mutant analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified protein and ATPase-defective mutant, replicated in subsequent studies","pmids":["18206976"],"is_preprint":false},{"year":2008,"finding":"FANCM promotes reversal of model replication forks via concerted displacement and annealing of nascent and parental DNA strands (fork reversal); this activity also occurs when the lagging strand template is partially single-stranded and bound by RPA.","method":"In vitro fork reversal assay with purified FANCM, 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 protein, extended prior branch migration finding with new substrate","pmids":["18843105"],"is_preprint":false},{"year":2008,"finding":"FANCM possesses ATP-independent DNA binding activity and ATP-dependent bi-directional branch-point translocation on four-way junction DNA. ATP-dependent activities are required for cellular resistance to mitomycin C but not for monoubiquitination of FANCD2/FANCI; the entire helicase domain (ATP-dependent and independent) is required for monoubiquitination.","method":"siRNA complementation, in vitro DNA binding and branch migration assays, mutant analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assays combined with siRNA-based complementation separating two mechanistic functions","pmids":["18285517"],"is_preprint":false},{"year":2008,"finding":"FANCM and FAAP24 are required for cell-cycle-dependent chromatin loading of the FA core complex; FANCM is exclusively localized to chromatin and undergoes cell-cycle-dependent phosphorylation. Depletion of FAAP24 disrupts chromatin association of FANCM and destabilizes it, preventing FA core complex recruitment to chromatin.","method":"Chromatin fractionation, siRNA depletion, immunofluorescence, co-immunoprecipitation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct chromatin fractionation with functional consequence, multiple orthogonal methods in single study","pmids":["18174376"],"is_preprint":false},{"year":2008,"finding":"FANCM and FAAP24 interact with checkpoint protein HCLK2 independently of the FA core complex. Downregulation of FANCM or FAAP24 compromises ATR/Chk1-mediated checkpoint signaling. The DNA translocase activity of FANCM—dispensable for FA pathway activation—is required for its role in ATR/Chk1 signaling.","method":"Co-immunoprecipitation, siRNA depletion, phosphorylation assays, checkpoint marker analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, siRNA depletion with specific phosphorylation readouts, translocase-dead mutant separating two functions","pmids":["18995830"],"is_preprint":false},{"year":2008,"finding":"The FANCM ortholog Fml1 in fission yeast promotes Rad51-dependent gene conversion at stalled/blocked replication forks and limits crossing over during mitotic double-strand break repair; in vitro Fml1 catalyzes both replication fork reversal and D-loop disruption.","method":"Genetic epistasis in S. pombe, in vitro D-loop disruption and fork reversal assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of D-loop disruption and fork reversal plus genetic epistasis in model organism ortholog","pmids":["18851838"],"is_preprint":false},{"year":2009,"finding":"FANCM connects the FA and Bloom Syndrome pathways via two conserved interaction motifs: MM1 interacts with the FA core complex by binding FANCF, and MM2 interacts with RMI1 and topoisomerase IIIα (components of the BLM/BS dissolvasome complex). Both motifs are independently required to activate their respective pathways, and loss of this bridging causes elevated sister chromatid exchanges.","method":"Mutant interaction motif analysis, co-immunoprecipitation, sister chromatid exchange assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — defined interaction domains by mutagenesis, functional rescue experiments, replicated by subsequent structural studies","pmids":["20064461"],"is_preprint":false},{"year":2009,"finding":"FANCM is hyperphosphorylated and degraded during mitosis; β-TRCP and Plk1 are the key regulators of FANCM degradation. Non-degradable FANCM mutants retain the FA core complex in chromatin and disrupt the FA pathway, revealing a mechanism for cell-cycle-dependent regulation.","method":"Co-immunoprecipitation, dominant-negative/non-degradable mutant analysis, chromatin fractionation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — identification of specific E3 ligase and kinase with non-degradable mutant functional readout, multiple orthogonal methods","pmids":["19270156"],"is_preprint":false},{"year":2009,"finding":"In Xenopus egg extracts, xFANCM binds chromatin in a replication-dependent manner and is phosphorylated in response to DNA damage; chromatin binding and phosphorylation are mediated in part by FANCD2 and by checkpoint kinases ATR and ATM.","method":"Xenopus egg extract system, chromatin fractionation, immunodepletion, kinase inhibitor experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean biochemical system with fractionation and defined kinase epistasis, but single lab/organism system","pmids":["19633289"],"is_preprint":false},{"year":2009,"finding":"FANCM controls DNA chain elongation in an ATPase-dependent manner in vivo; in the presence of replication inhibitors that do not damage DNA, FANCM counteracts fork movement, whereas through damaged DNA FANCM promotes replication and recovers stalled forks. Chk1 signaling prevents FANCM degradation by the proteasome after DNA damage, and FANCM stabilizes Chk1 in a feedback loop.","method":"DNA fiber analysis, ATPase-defective mutant, siRNA depletion, proteasome inhibitor experiments","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DNA fiber assay plus ATPase mutant distinguishing two in vivo fork functions, multiple orthogonal methods single lab","pmids":["20010692"],"is_preprint":false},{"year":2010,"finding":"FANCM forms a conserved DNA-remodeling complex with the histone-fold heterodimer MHF1-MHF2; MHF stimulates DNA binding and replication fork remodeling by FANCM. FANCM and MHF are rapidly recruited to forks stalled by DNA interstrand crosslinks and are required for cellular resistance. In vertebrates, FANCM-MHF promotes FANCD2 monoubiquitination and suppresses sister chromatid exchanges.","method":"Biochemical reconstitution, chromatin immunoprecipitation, siRNA/knockout, FANCD2 monoubiquitination assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution of MHF-stimulated fork remodeling, live-cell recruitment, FANCD2 modification assay; replicated in parallel by Singh et al. (PMID 20347429)","pmids":["20347428","20347429"],"is_preprint":false},{"year":2010,"finding":"MHF1 and MHF2 assemble into a heterodimer that binds DNA and enhances the DNA branch migration activity of FANCM; suppression of MHF1 destabilizes FANCM and MHF2, impairs FANCD2 monoubiquitination and foci formation, disrupts chromatin localization of FA core complex proteins, and causes chromosomal instability.","method":"siRNA depletion, co-immunoprecipitation, DNA binding assay, branch migration assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro DNA binding and branch migration assay combined with cellular epistasis; concurrent with and consistent with Yan et al. (PMID 20347428)","pmids":["20347429"],"is_preprint":false},{"year":2010,"finding":"FANCM and FAAP24 are specifically required for recruitment of RPA to ICL-stalled replication forks; ICL-induced RPA foci formation requires the DNA-binding activity of FAAP24 but not the DNA translocase activity of FANCM; FANCM/FAAP24-dependent RPA recruitment is required for efficient ATR-mediated checkpoint activation in response to ICL.","method":"siRNA depletion, immunofluorescence foci analysis, translocase-dead mutant, ATR substrate phosphorylation assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — separation-of-function mutagenesis (translocase vs. DNA-binding) with specific RPA foci and checkpoint readouts, multiple orthogonal methods","pmids":["20670894"],"is_preprint":false},{"year":2010,"finding":"FANCM promotes replication fork restart and limits accumulation of RPA-ssDNA; in DT40 cells this process is controlled by ATR and PLK1. FANCM promotes chromatin retention of TopBP1, and failure to retain TopBP1 impairs ATR phosphorylation of downstream targets including Chk1 and SMC1.","method":"DT40 knockout, DNA fiber analysis, chromatin fractionation, epistasis with ATR/PLK1 inhibitors","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockout in DT40 with DNA fiber analysis, chromatin fractionation of TopBP1, specific downstream phosphorylation readouts","pmids":["20057355"],"is_preprint":false},{"year":2012,"finding":"Crystal structures of MHF1-MHF2 alone and bound to FANCM fragment (residues 661-800) show MHF forms a compact tetramer; FANCM binds through a 'dual-V' shaped structure; FANCM and (MHF1-MHF2)2 cooperate to form a new DNA-binding site coupled to the canonical L1L2 region. A disease-associated FANCM mutant alters the MHF-FANCM interaction and subcellular localization.","method":"X-ray crystallography, mutagenesis, subcellular localization assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure at atomic resolution combined with mutagenesis validation and in vivo localization assay","pmids":["22510687"],"is_preprint":false},{"year":2012,"finding":"The X-ray crystal structure of the RMI core complex bound to a conserved FANCM peptide shows FANCM binds both RMI1 and RMI2 through a hydrophobic 'knobs-into-holes' arrangement. Alanine substitutions at key interface residues strongly destabilize the complex and increase SCE levels comparable to BLM- or FANCM-deficient cells.","method":"X-ray crystallography, mutagenesis, co-immunoprecipitation, sister chromatid exchange assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis validation and functional SCE assay in cells","pmids":["22392978"],"is_preprint":false},{"year":2012,"finding":"FANCM translocase activity is essential for promoting replication fork stability; cells expressing translocase-defective FANCM show increased stalled forks that degenerate into DSBs leading to ATM activation, CtIP-dependent end resection, and homologous recombination repair.","method":"Translocase-dead mutant knock-in, DNA fiber analysis, ATM activation assays, genetic epistasis with ATM/CtIP","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — separation-of-function mutant with DNA fiber analysis and multiple downstream pathway readouts, genetic epistasis","pmids":["22279085"],"is_preprint":false},{"year":2013,"finding":"FANCM/MHF complex translocase and DNA-binding activities promote replication traverse of DNA interstrand crosslinks, allowing DNA synthesis to continue past ICLs without lesion repair; inactivation of translocase or DNA-binding activities strongly reduces traverse frequency.","method":"Single-molecule visualization of replication fork encounters with ICLs in living cells, translocase-dead and DNA-binding mutants","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — novel single-molecule technique in living cells with separation-of-function mutants, directly demonstrating the traverse mechanism","pmids":["24207054"],"is_preprint":false},{"year":2013,"finding":"FANCM and FAAP24 possess non-overlapping functions: FAAP24 promotes ATR-mediated checkpoint activation in response to DNA crosslinking agents, whereas FANCM participates in recombination-independent ICL repair by facilitating recruitment of lesion incision activities requiring its translocase activity.","method":"Isogenic FANCM and FAAP24 knockout cell lines, epistasis analysis, DNA repair assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean isogenic knockouts with multiple orthogonal assays separating FANCM and FAAP24 functions","pmids":["23333308"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of the C-terminal segment of FANCM in complex with FAAP24 reveals both proteins have a nuclease domain and tandem helix-hairpin-helix (HhH)2 domain; variations in key residues render FANCM's nuclease domain catalytically inactive; the first HhH motif of FAAP24 is a DNA-binding site critical for targeting FANCM-FAAP24 to chromatin.","method":"X-ray crystallography, mutagenesis, chromatin-targeting assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis and functional chromatin targeting validation","pmids":["24003026"],"is_preprint":false},{"year":2013,"finding":"Structure of FANCM C-terminal domain (FANCMCTD) bound to FAAP24 and DNA reveals the FANCM (HhH)2 domain is buried while FAAP24 (HhH)2 domain engages DNA; a second DNA contact and metal center in the FANCM pseudo-nuclease domain are required for double-stranded DNA binding in vitro and FANCM-FAAP24 function in vivo. EM shows the translocase domain lies in proximity to FANCMCTD.","method":"X-ray crystallography, electron microscopy, mutagenesis, in vitro DNA binding, in vivo complementation","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis, EM, and in vivo functional validation","pmids":["23932590"],"is_preprint":false},{"year":2013,"finding":"ATR-dependent phosphorylation of FANCM at serine 1045 in response to genotoxic stress is required for FANCM functions including FA pathway integrity, recruitment of FANCM to ICL sites, preventing premature mitotic entry, and efficient CHK1 and G2/M checkpoint activation, establishing an ATR-FANCM feedback loop.","method":"Phospho-specific antibody, ATR inhibition, phosphorylation-defective mutant (S1045A), checkpoint activation assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific phosphosite identified, ATR dependence established, phospho-dead mutant with multiple functional readouts","pmids":["23698467"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of MHF bound to the MHF-interaction domain (MID) of FANCM shows one MHF heterotetramer wrapped by a single MID polypeptide; a zinc atom-liganding structure at the interface stabilizes the complex; MID binding switches MHF DNA-binding preference from duplex DNA to branched DNA. Mutations disrupting the composite DNA-binding surface or protein-protein interface impair FA network activation and genome stability.","method":"X-ray crystallography, structure-guided mutagenesis, DNA binding assays, FANCD2 monoubiquitination assay","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with structure-guided mutagenesis and functional validation of DNA-binding switch mechanism","pmids":["24699063"],"is_preprint":false},{"year":2016,"finding":"FANCM interacts with PCNA through a conserved PIP-box motif; the interaction is strongly stimulated by replication stress. A PIP-box mutant FANCM variant is defective in promoting replication traverse of ICLs and inefficient in promoting FANCD2 monoubiquitination.","method":"Co-immunoprecipitation, PIP-box mutant analysis, ICL traverse assay, FANCD2 monoubiquitination assay, structural analysis of archaeal Hef-PCNA interaction","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — PIP-box mutant with two orthogonal functional assays (traverse and monoubiquitination), conservation confirmed in archaeal homolog","pmids":["26825464"],"is_preprint":false},{"year":2016,"finding":"FANCM recruitment to ICL-stalled replication forks depends on its intrinsic DNA translocase activity, FAAP24 DNA-binding, ATR kinase activity, and direct interaction with the BLM-TOP3A-RMI (BTR) complex including the helicase activity of BLM; this recruitment is independent of the FA core complex and FANCD2-FANCI. The FANCM-BLM interaction is critical for FANCM hyperphosphorylation, FA pathway activation, and ICL traverse.","method":"Novel FANCM-recruitment protocol, translocase-dead and interaction mutants, co-immunoprecipitation, epistasis analysis","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 2 / Moderate — newly developed recruitment assay with separation-of-function mutants and comprehensive epistasis analysis","pmids":["28058110"],"is_preprint":false},{"year":2017,"finding":"FANCM depletion induces replication stress primarily at telomeres of ALT cells; FANCM, BRCA1, and BLM are actively recruited to ALT telomeres experiencing replication stress; BRCA1 and BLM recruitment is interdependent and regulated by ATR and Chk1. In FANCM-depleted ALT cells, BRCA1 and BLM resolve telomeric replication stress by stimulating DNA end resection and homologous recombination.","method":"siRNA depletion, telomere-specific single-molecule analysis of replicated DNA (SMARD), co-depletion epistasis, immunofluorescence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — single-molecule DNA replication analysis, multiple co-depletions defining epistatic pathway, specific recruitment readouts","pmids":["28673972"],"is_preprint":false},{"year":2019,"finding":"The ATPase/translocase activity of FANCM keeps telomeric replicative stress in check in ALT cells by suppressing BLM-driven telomere stress and by unwinding telomeric R-loops (TERRA R-loops) in vitro; FANCM depletion increases ALT-associated marks, de novo telomeric DNA synthesis, and BLM-dependent telomere dysfunction. RNaseH1 overexpression abrogates residual replication stress in FANCM+BLM co-depleted cells.","method":"siRNA/shRNA depletion, in vitro R-loop unwinding assay, ALT biomarker analysis, epistasis with BLM depletion and RNaseH1 overexpression","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro R-loop unwinding combined with multiple in-cell epistasis experiments; three independent labs converged on similar conclusions (PMIDs 31138795, 31138797, 31836759)","pmids":["31138795"],"is_preprint":false},{"year":2019,"finding":"FANCM-mediated attenuation of ALT requires its DNA translocase activity and interaction with the BTR (BLM-TOP3A-RMI) complex but does not require the FA core complex. FANCM depletion provokes ALT activity via increased break-induced telomere synthesis. Synthetic inhibition of FANCM-BTR complex formation is selectively toxic to ALT cancer cells.","method":"siRNA/shRNA depletion, translocase-dead mutant, BTR interaction mutant, break-induced replication assay, ALT biomarker analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — separation-of-function mutants (translocase-dead vs. BTR-interaction mutant) with defined ALT pathway readouts; consistent with concurrent parallel study","pmids":["31138797"],"is_preprint":false},{"year":2019,"finding":"FANCM (via FAAP24 interaction) disrupts TERRA R-loops at ALT telomeres; depletion of FAAP24 or FANCM induces dramatic increase of C-circle formation driven by ATR/Chk1, BTR complex, HR proteins (BRCA2, PALB2, RAD51), and BIR factors (POLD1, POLD3). RNase H1 overexpression attenuates ALT phenotypes caused by FANCM deficiency.","method":"siRNA depletion of FANCM complex components, C-circle assay, co-depletion epistasis, RNaseH1 overexpression","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — comprehensive epistasis with multiple pathway components and R-loop rescue experiment; consistent with concurrent independent labs","pmids":["31836759"],"is_preprint":false},{"year":2019,"finding":"FANCM binds the replisome complex following ICL introduction in an ATR- and FANCD2-dependent but FA core protein- and FAAP24-independent manner, with concomitant release of GINS proteins from the CMG helicase. ATR-dependent phosphorylated FANCM promotes this replisome remodeling.","method":"Proximity ligation and co-immunoprecipitation with replisome components, GINS release assay, ATR inhibition, in situ replisome analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in-cell replisome co-IP plus in situ GINS release analysis with genetic epistasis (ATR/FANCD2 dependence)","pmids":["31067464"],"is_preprint":false},{"year":2021,"finding":"Distinct FANCM repair functions at stalled forks are enacted by molecularly separable scaffolding domains; FANCM ATPase function is required for all its repair functions and its inactivation 'traps' FANCM at stalled forks. Brca1 hypomorphic mutants are synthetic lethal with Fancm null or Fancm ATPase-defective mutants.","method":"Endogenous Fancm domain-specific mutations in mouse ES cells, DNA repair assays, synthetic lethality analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — defined endogenous mutations with multiple repair readouts and synthetic lethality testing in physiological model","pmids":["33882298"],"is_preprint":false},{"year":2022,"finding":"And-1 (a replisome protein) is critical for activation of the FA pathway by sensing ICL-stalled forks and recruiting the FANCM/FAAP24 complex to ICLs; this requires ATR-induced phosphorylation of And-1 at T826, which triggers an intramolecular change promoting And-1 interaction with FANCM/FAAP24.","method":"Co-immunoprecipitation, phospho-specific antibody, phospho-dead mutant (T826A), FANCD2 monoubiquitination assay, chromatin recruitment assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific phosphosite with phospho-dead mutant, co-IP demonstrating interaction, and FANCD2 monoubiquitination as functional readout","pmids":["35867033"],"is_preprint":false},{"year":2024,"finding":"The Hel2i subdomain within the N-terminal translocase domain is crucial for FANCM's specific branched DNA engagement, coupling DNA binding to catalytic ATP-dependent branch migration. Mutations in Hel2i or key DNA-binding residues diminish junction DNA affinity and abolish branch migration activity, and these mutants fail to rescue ALT cell death or telomere replication stress upon FANCM depletion.","method":"Mutagenesis of Hel2i subdomain, DNA binding assays, branch migration assay, ALT cell rescue assay, cell cycle and telomere stress assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assays with domain-specific mutants combined with in-cell functional rescue, mechanistic domain mapping","pmids":["39189453"],"is_preprint":false},{"year":2024,"finding":"Crystal structures of FANCM's N-terminal translocase domain (2.2 Å) and C-terminal FAAP24-bound region (2.4 Å), both complexed with branched DNA, reveal two distinct mechanisms: (1) ATP-dependent branch migration essential for DNA damage survival, and (2) a branched DNA-binding mode at the C-terminal domain that enhances FANCD2-FANCI monoubiquitination through FA core complex interaction.","method":"X-ray crystallography, biochemical reconstitution, mutagenesis, FANCD2-FANCI monoubiquitination assay, cellular rescue experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution crystal structures combined with biochemical reconstitution, mutagenesis, and functional cellular validation of two distinct mechanisms","pmids":["40447800"],"is_preprint":false},{"year":2024,"finding":"SMARCAL1 displays a profound synthetic-lethal interaction with FANCM; combined loss causes severe genome instability linked to chromosome breakage at simple repeat loci that challenge replication fork progression.","method":"CRISPR-based synthetic lethality screen, double-knockout cell lines, genomic instability assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR-based screen with double-KO validation and defined chromosomal instability phenotype at specific genomic loci","pmids":["39510066"],"is_preprint":false},{"year":2024,"finding":"FANCM promotes PARP inhibitor resistance independent of the FA core complex by minimizing ssDNA gap formation behind replication forks through counteracting 53BP1; FANCM depletion leads to increased ssDNA gaps (via 53BP1- and PRIMPOL-dependent mechanisms) and reduced resection of collapsed forks, while 53BP1 deletion restores resection and mitigates PARPi sensitivity.","method":"siRNA depletion, ssDNA gap assay, genetic epistasis with 53BP1 and PRIMPOL, DNA fiber analysis, resection assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal assays including ssDNA gap quantification, resection assay, and genetic epistasis with 53BP1 deletion rescue","pmids":["38985669"],"is_preprint":false},{"year":2009,"finding":"Walker B motif mutation in avian FANCM (DT40 cells) does not affect FA pathway activation or crosslink repair, but results in elevated sister chromatid exchanges; FANCM functions with BLM helicase to suppress spontaneous SCE events, placing them in the same pathway.","method":"DT40 knockout complementation with Walker B mutant, sister chromatid exchange assay, epistasis with BLM","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — separation-of-function Walker B mutant with SCE assay and BLM epistasis in clean DT40 system","pmids":["19465393"],"is_preprint":false},{"year":2018,"finding":"FANCM, along with FAAP24 and MHF1/2, is recruited to CFS-derived structure-prone AT-rich sequences and suppresses DSB formation and mitotic recombination there in a manner dependent on FANCM translocase activity; this function is independent of the FA core complex and FANCI-FANCD2 complex.","method":"FANCM knockout, translocase-dead mutant, DSB assays at AT-rich sequences, epistasis with FA complex components","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — translocase-dead separation-of-function mutant with FA complex epistasis defining an independent function at common fragile sites","pmids":["30022024"],"is_preprint":false},{"year":2018,"finding":"In C. elegans, FANCM/CeFNCM-1 interacts with the histone demethylase LSD1/CeSPR-5; LSD1/CeSPR-5 is required for replication stress-induced S-phase checkpoint activation; FANCM relocalizes upon hydroxyurea exposure and colocalizes with FANCD2/CeFCD-2 and LSD1/CeSPR-5. The FA pathway is required for H3K4me2 maintenance.","method":"Co-immunoprecipitation, fluorescence microscopy, genetic epistasis in C. elegans","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and colocalization in C. elegans ortholog, genetic epistasis establishing connection to histone methylation maintenance, single lab","pmids":["29588287"],"is_preprint":false},{"year":2020,"finding":"In budding yeast, Mph1 (FANCM ortholog) prevents precocious DSB strand exchange between sister chromatids before homologs complete pairing by dissociating precocious D-loops between sister chromatids; this ensures high levels of crossovers and non-crossovers between homologs. Later recombination events are protected from Mph1-mediated dissociation by synapsis protein Zip1.","method":"Yeast genetics, D-loop dissociation assay, meiotic recombination analysis, Zip1 epistasis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct D-loop dissociation activity linked to meiotic phenotype with Zip1 protection mechanism established by epistasis","pmids":["32386601"],"is_preprint":false}],"current_model":"FANCM is an ATP-dependent DNA translocase/branchpoint migrase that recognizes branched DNA structures (stalled replication forks, Holliday junctions, R-loops) through its N-terminal translocase domain (particularly the Hel2i subdomain) and promotes fork reversal, branch migration, and replication traverse of interstrand crosslinks; it serves as a molecular scaffold that recruits the FA core complex to chromatin (via FAAP24 and a C-terminal FANCF-binding motif MM1), links the FA and Bloom syndrome dissolvasome pathways (via RMI1/RMI2 binding through motif MM2), facilitates ATR/CHK1 checkpoint activation, undergoes ATR-dependent phosphorylation at S1045 and mitotic Plk1/β-TRCP-driven degradation for cell-cycle regulation, suppresses toxic R-loop accumulation at ALT telomeres to restrain break-induced telomere synthesis, and limits meiotic crossovers by disassembling D-loops to promote non-crossover synthesis-dependent strand annealing."},"narrative":{"mechanistic_narrative":"FANCM is an ATP-dependent DNA translocase and branch-point migrase that recognizes branched DNA intermediates—Holliday junctions, replication forks, and D-loops—and remodels them to preserve genome stability during replication stress [PMID:18206976, PMID:18285517]. Through its N-terminal translocase domain it catalyzes bidirectional branch migration and replication fork reversal in an ATPase-dependent manner [PMID:18206976, PMID:18843105], with the Hel2i subdomain coupling specific branched-DNA engagement to catalytic migration [PMID:39189453, PMID:40447800]. Beyond its enzymatic activity, FANCM serves as a chromatin-targeting scaffold that loads the Fanconi anemia core complex onto chromatin in a cell-cycle-dependent manner and is required for normal FANCD2 monoubiquitination [PMID:18174376, PMID:17289582]; it bridges the FA and Bloom syndrome dissolvasome pathways through two conserved motifs—MM1 binding the core complex via FANCF and MM2 binding RMI1/topoisomerase IIIα—with loss of bridging elevating sister chromatid exchange [PMID:20064461, PMID:22392978]. FANCM functions in a stable heterodimeric module with the histone-fold proteins MHF1-MHF2, which stimulate its DNA binding and fork-remodeling activity and switch its DNA-binding preference toward branched DNA [PMID:20347428, PMID:20347429, PMID:24699063], and it partners with FAAP24, whose DNA-binding (HhH)2 domain targets the complex to chromatin [PMID:17289582, PMID:24003026]. Functionally distinct activities are separable: the translocase activity is dispensable for FA pathway activation but required for replication fork stability, ICL traverse, ATR/CHK1 checkpoint signaling, and recovery of stalled forks [PMID:18285517, PMID:18995830, PMID:22279085, PMID:24207054], and FANCM facilitates ATR checkpoint activation by promoting RPA and TopBP1 chromatin retention [PMID:20670894, PMID:20057355]. FANCM is regulated by ATR-dependent phosphorylation at S1045 and by Plk1/β-TRCP-driven mitotic degradation that releases the core complex from chromatin [PMID:23698467, PMID:19270156]. At ALT telomeres, its translocase activity and BTR-complex interaction suppress TERRA R-loops and BLM-driven break-induced telomere synthesis, rendering FANCM-BTR disruption selectively toxic to ALT cancer cells [PMID:31138795, PMID:31138797], and FANCM loss is synthetic-lethal with BRCA1 hypomorphs and with SMARCAL1 [PMID:33882298, PMID:39510066]. The ortholog studies establish a conserved role in limiting recombination outcomes by dissociating D-loops, including meiotic crossover control [PMID:18851838, PMID:32386601].","teleology":[{"year":2007,"claim":"Established that FANCM operates within a defined protein assembly and links DNA-structure recognition to the FA pathway, identifying FAAP24 as its targeting partner required for FANCD2 monoubiquitination.","evidence":"Co-IP, siRNA depletion, and cellular sensitivity assays defining the FANCM-FAAP24 interaction","pmids":["17289582"],"confidence":"High","gaps":["Did not resolve whether FANCM itself is the catalytic translocase","Mechanism of structure recognition unresolved at this stage"]},{"year":2008,"claim":"Defined the core biochemical activity of FANCM by showing it is an ATP-dependent branch-point migrase and fork-reversal enzyme acting directly on branched DNA, separating this enzymatic role from its requirement for FANCD2 monoubiquitination.","evidence":"In vitro reconstitution with purified protein, ATPase/Walker-B-defective mutants, branch migration and fork reversal assays, siRNA complementation","pmids":["18206976","18843105","18285517"],"confidence":"High","gaps":["How translocase activity contributes in vivo not yet shown","Substrate selectivity determinants within the protein unmapped"]},{"year":2008,"claim":"Showed FANCM is a chromatin-localized scaffold whose recruitment, together with FAAP24, is required to load the FA core complex onto chromatin, and that it also feeds ATR/CHK1 checkpoint signaling via HCLK2 independently of the core complex.","evidence":"Chromatin fractionation, siRNA depletion, immunofluorescence, Co-IP, and translocase-dead mutant analysis","pmids":["18174376","18995830"],"confidence":"High","gaps":["Precise determinants of cell-cycle-regulated chromatin loading unresolved","How translocase activity drives checkpoint signaling mechanistically unclear"]},{"year":2008,"claim":"Demonstrated through the fission yeast ortholog Fml1 that the branch-migration/D-loop-disruption activity is evolutionarily conserved and channels stalled-fork repair toward Rad51-dependent gene conversion while limiting crossovers.","evidence":"Genetic epistasis in S. pombe and in vitro D-loop disruption and fork reversal assays","pmids":["18851838"],"confidence":"High","gaps":["Conservation of crossover-limiting function in vertebrates not addressed here"]},{"year":2009,"claim":"Revealed how FANCM is regulated across the cell cycle and the replication-stress response, showing mitotic Plk1/β-TRCP degradation releases the core complex and that Chk1 signaling stabilizes FANCM in a feedback loop while it controls fork elongation.","evidence":"Non-degradable and ATPase-defective mutants, chromatin fractionation, DNA fiber analysis, proteasome inhibition, and Xenopus extract phosphorylation studies","pmids":["19270156","20010692","19633289","19465393"],"confidence":"High","gaps":["Phosphosites driving degradation not fully mapped","Walker-B mutant SCE phenotype mechanism beyond BLM epistasis incomplete"]},{"year":2010,"claim":"Established FANCM as a constitutive partner of the histone-fold heterodimer MHF1-MHF2, which stimulates its DNA binding and fork remodeling and is needed for FANCD2 monoubiquitination and suppression of chromosomal instability.","evidence":"Biochemical reconstitution, ChIP, siRNA/knockout, branch migration assays, and FANCD2 monoubiquitination readouts","pmids":["20347428","20347429"],"confidence":"High","gaps":["Structural basis of MHF stimulation not yet resolved at this point"]},{"year":2010,"claim":"Defined how FANCM/FAAP24 couples to checkpoint activation, showing it recruits RPA and retains TopBP1 at ICL-stalled forks to enable ATR phosphorylation of CHK1 and SMC1, with RPA recruitment dependent on FAAP24 DNA binding rather than FANCM translocase.","evidence":"siRNA depletion, separation-of-function mutants (translocase vs DNA-binding), foci analysis, chromatin fractionation, and ATR substrate readouts in DT40","pmids":["20670894","20057355"],"confidence":"High","gaps":["How TopBP1 retention is physically achieved unresolved","Order of RPA, TopBP1, and core-complex recruitment events not fully ordered"]},{"year":2012,"claim":"Provided the structural logic for FANCM's pathway-bridging and DNA-remodeling scaffolds by solving the MHF-FANCM and RMI-FANCM interfaces and linking their disruption to elevated SCE and altered localization.","evidence":"X-ray crystallography of MHF1-MHF2-FANCM and RMI core-FANCM peptide complexes with mutagenesis and SCE assays","pmids":["22510687","22392978","20064461"],"confidence":"High","gaps":["Full-length architecture coupling these modules to the translocase not resolved"]},{"year":2012,"claim":"Separated the FANCM repair functions in vivo, showing translocase activity is essential for fork stability and that its loss converts stalled forks into DSBs that trigger ATM-CtIP-dependent resection and HR.","evidence":"Translocase-dead knock-in, DNA fiber analysis, ATM activation assays, and genetic epistasis","pmids":["22279085"],"confidence":"High","gaps":["Direct demonstration of fork reversal as the protective mechanism in cells still pending"]},{"year":2013,"claim":"Resolved the FANCM-FAAP24 C-terminal architecture and demonstrated that FANCM mediates replication traverse of ICLs, allowing forks to bypass crosslinks without repair, using both translocase and DNA-binding activities.","evidence":"Crystallography and EM of the FANCM-FAAP24 CTD with DNA, single-molecule ICL-traverse imaging in living cells, and separation-of-function mutants","pmids":["24003026","23932590","24207054","23333308"],"confidence":"High","gaps":["FANCM nuclease domain is catalytically dead—its structural role remains functional but non-enzymatic","How traverse is coordinated with later repair unresolved"]},{"year":2013,"claim":"Identified ATR-FANCM feedback through phosphorylation at S1045, required for FA pathway integrity, ICL-site recruitment, and checkpoint enforcement, establishing post-translational control of FANCM during genotoxic stress.","evidence":"Phospho-specific antibody, ATR inhibition, and S1045A mutant with checkpoint readouts","pmids":["23698467"],"confidence":"High","gaps":["Whether S1045 phosphorylation directly alters translocase or scaffolding activity not resolved"]},{"year":2014,"claim":"Showed the FANCM MID switches MHF DNA-binding preference from duplex to branched DNA via a zinc-stabilized interface, defining a structural mechanism coupling complex assembly to substrate specificity and FA network activation.","evidence":"Crystallography of MHF-MID, structure-guided mutagenesis, DNA binding and FANCD2 monoubiquitination assays","pmids":["24699063"],"confidence":"High","gaps":["In vivo consequence of the binding-mode switch on specific substrates incomplete"]},{"year":2016,"claim":"Connected FANCM directly to the replisome and ICL recognition, showing a stress-stimulated PIP-box interaction with PCNA and a translocase/BTR/ATR-dependent recruitment pathway to ICL-stalled forks that drives hyperphosphorylation and ICL traverse independently of the core complex.","evidence":"PIP-box mutant analysis, recruitment assays, Co-IP, and epistasis with BLM, ATR, and FAAP24","pmids":["26825464","28058110"],"confidence":"High","gaps":["Hierarchy of PCNA, BTR, and FAAP24 contributions to recruitment not fully ordered"]},{"year":2017,"claim":"Extended FANCM function to telomere maintenance, showing it is recruited to ALT telomeres under replication stress and that its loss provokes BRCA1/BLM-dependent resection and HR to resolve telomeric replication stress.","evidence":"siRNA depletion, telomere-specific SMARD, co-depletion epistasis, and immunofluorescence","pmids":["28673972"],"confidence":"High","gaps":["Direct biochemical substrate at ALT telomeres not yet defined at this stage"]},{"year":2019,"claim":"Defined the mechanism of FANCM at ALT telomeres as translocase-dependent suppression of TERRA R-loops and BLM-driven break-induced telomere synthesis via BTR-complex interaction, revealing FANCM-BTR disruption as selectively toxic to ALT cancers.","evidence":"In vitro R-loop unwinding, translocase-dead and BTR-interaction mutants, C-circle and break-induced replication assays, and RNase H1 rescue across three independent labs","pmids":["31138795","31138797","31836759"],"confidence":"High","gaps":["Whether R-loop unwinding is the sole protective activity at telomeres not fully isolated","Therapeutic window of FANCM-BTR disruption in vivo unaddressed"]},{"year":2019,"claim":"Showed FANCM remodels the stalled replisome after ICL encounter, binding the replisome in an ATR/FANCD2-dependent manner and triggering GINS release from CMG, linking FANCM phosphorylation to active replisome restructuring.","evidence":"Proximity ligation and Co-IP with replisome components, GINS-release assay, and ATR inhibition","pmids":["31067464"],"confidence":"High","gaps":["Direct enzymatic basis for GINS release not established","Fate of the remodeled replisome unresolved"]},{"year":2021,"claim":"Demonstrated that FANCM repair functions partition among molecularly separable scaffolding domains while ATPase activity is universally required, and that FANCM loss or ATPase inactivation is synthetic-lethal with BRCA1 hypomorphs, defining therapeutic vulnerability.","evidence":"Endogenous domain-specific Fancm mutations in mouse ES cells, repair assays, and synthetic-lethality testing","pmids":["33882298"],"confidence":"High","gaps":["Molecular trigger of FANCM trapping at forks upon ATPase inactivation unresolved"]},{"year":2022,"claim":"Identified And-1 as a replisome sensor of ICL-stalled forks that recruits FANCM/FAAP24 via ATR-induced phosphorylation, placing FANCM recruitment downstream of a defined replisome-resident signal.","evidence":"Co-IP, phospho-specific antibody, And-1 T826A mutant, chromatin recruitment, and FANCD2 monoubiquitination assays","pmids":["35867033"],"confidence":"High","gaps":["Whether And-1 and PCNA recruitment routes are redundant or sequential unresolved"]},{"year":2024,"claim":"Pinned down the structural and catalytic basis of FANCM's two activities, showing the Hel2i subdomain mediates branched-DNA engagement and ATP-dependent migration, while the C-terminal branched-DNA-binding mode enhances FANCD2-FANCI monoubiquitination through FA core complex interaction.","evidence":"Atomic-resolution crystal structures of N-terminal translocase and C-terminal FAAP24-bound regions with branched DNA, Hel2i mutagenesis, biochemical reconstitution, and ALT/monoubiquitination rescue assays","pmids":["39189453","40447800"],"confidence":"High","gaps":["Full-length conformational coupling between the two domains during catalysis not yet captured"]},{"year":2024,"claim":"Expanded the genome-protective network of FANCM, revealing synthetic lethality with SMARCAL1 at replication-challenging repeats and a core-complex-independent role in suppressing 53BP1/PRIMPOL-driven ssDNA gaps that confers PARP inhibitor resistance.","evidence":"CRISPR synthetic-lethality screen with double knockouts, ssDNA gap and resection assays, and genetic epistasis with 53BP1 and PRIMPOL","pmids":["39510066","38985669"],"confidence":"High","gaps":["Mechanism by which FANCM counteracts 53BP1 at gaps unresolved","Whether translocase activity is required for gap suppression not isolated"]},{"year":null,"claim":"How FANCM's separable enzymatic and scaffolding activities are dynamically switched and coordinated in real time across distinct genomic contexts (forks, ICLs, ALT telomeres, fragile sites) by phosphorylation, partner binding, and conformational change remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified model linking domain coupling to context-specific output","Full-length structure during catalysis not determined","Regulatory integration of ATR phosphorylation with degradation and recruitment incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1,2,3,17,18,33]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,3,20,21,33,34]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[1,2,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,7,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,13,14]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[4,8,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,15]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,3,11,18,19]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[2,14,17,30]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[5,13,14,22]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[27,28,31,35,36]}],"complexes":["FANCM-FAAP24","FANCM-MHF1-MHF2","Fanconi anemia core complex","BLM-TOP3A-RMI (BTR) dissolvasome"],"partners":["FAAP24","MHF1","MHF2","FANCF","RMI1","BLM","PCNA","AND-1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IYD8","full_name":"Fanconi anemia group M protein","aliases":["ATP-dependent RNA helicase FANCM","Fanconi anemia-associated polypeptide of 250 kDa","FAAP250","Protein Hef ortholog"],"length_aa":2048,"mass_kda":232.2,"function":"DNA-dependent ATPase component of the Fanconi anemia (FA) core complex (PubMed:16116422). Required for the normal activation of the FA pathway, leading to monoubiquitination of the FANCI-FANCD2 complex in response to DNA damage, cellular resistance to DNA cross-linking drugs, and prevention of chromosomal breakage (PubMed:16116422, PubMed:19423727, PubMed:20347428, PubMed:20347429, PubMed:29231814). In complex with CENPS and CENPX, binds double-stranded DNA (dsDNA), fork-structured DNA (fsDNA) and Holliday junction substrates (PubMed:20347428, PubMed:20347429). Its ATP-dependent DNA branch migration activity can process branched DNA structures such as a movable replication fork. This activity is strongly stimulated in the presence of CENPS and CENPX (PubMed:20347429). In complex with FAAP24, efficiently binds to single-strand DNA (ssDNA), splayed-arm DNA, and 3'-flap substrates (PubMed:17289582). In vitro, on its own, strongly binds ssDNA oligomers and weakly fsDNA, but does not bind to dsDNA (PubMed:16116434)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8IYD8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FANCM","classification":"Not Classified","n_dependent_lines":449,"n_total_lines":1208,"dependency_fraction":0.3716887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FANCM","total_profiled":1310},"omim":[{"mim_id":"618096","title":"PREMATURE OVARIAN FAILURE 15; POF15","url":"https://www.omim.org/entry/618096"},{"mim_id":"618086","title":"SPERMATOGENIC FAILURE 28; SPGF28","url":"https://www.omim.org/entry/618086"},{"mim_id":"615183","title":"FA CORE COMPLEX-ASSOCIATED PROTEIN 20; FAAP20","url":"https://www.omim.org/entry/615183"},{"mim_id":"615128","title":"CENTROMERIC PROTEIN X; CENPX","url":"https://www.omim.org/entry/615128"},{"mim_id":"611301","title":"FA CORE COMPLEX-ASSOCIATED PROTEIN 100; FAAP100","url":"https://www.omim.org/entry/611301"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"testis","ntpm":6.5}],"url":"https://www.proteinatlas.org/search/FANCM"},"hgnc":{"alias_symbol":["FAAP250"],"prev_symbol":["KIAA1596"]},"alphafold":{"accession":"Q8IYD8","domains":[{"cath_id":"3.40.50.300","chopping":"56-266_622-641","consensus_level":"high","plddt":87.5284,"start":56,"end":641},{"cath_id":"1.20.1320.20","chopping":"292-424","consensus_level":"medium","plddt":86.3522,"start":292,"end":424},{"cath_id":"3.40.50.300","chopping":"447-464_477-597","consensus_level":"medium","plddt":85.4474,"start":447,"end":597},{"cath_id":"3.40.50.10130","chopping":"1817-1904_1914-1961","consensus_level":"medium","plddt":85.7846,"start":1817,"end":1961},{"cath_id":"1.10.150.20","chopping":"1962-2048","consensus_level":"medium","plddt":75.4556,"start":1962,"end":2048}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYD8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYD8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYD8-F1-predicted_aligned_error_v6.png","plddt_mean":51.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FANCM","jax_strain_url":"https://www.jax.org/strain/search?query=FANCM"},"sequence":{"accession":"Q8IYD8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IYD8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IYD8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYD8"}},"corpus_meta":[{"pmid":"17289582","id":"PMC_17289582","title":"Identification 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FAAP24 is required for normal levels of FANCD2 monoubiquitylation following DNA damage.\",\n      \"method\": \"Co-immunoprecipitation, siRNA depletion, cellular sensitivity assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional siRNA depletion with defined phenotypic readouts, replicated across multiple labs subsequently\",\n      \"pmids\": [\"17289582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Purified FANCM binds Holliday junctions and replication forks with high specificity and promotes migration of their junction point in an ATPase-dependent manner; FANCM can dissociate large recombination intermediates via branch migration of Holliday junctions through 2.6 kb of DNA.\",\n      \"method\": \"In vitro branch migration assay with purified protein, ATPase-defective mutant analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified protein and ATPase-defective mutant, replicated in subsequent studies\",\n      \"pmids\": [\"18206976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FANCM promotes reversal of model replication forks via concerted displacement and annealing of nascent and parental DNA strands (fork reversal); this activity also occurs when the lagging strand template is partially single-stranded and bound by RPA.\",\n      \"method\": \"In vitro fork reversal assay with purified FANCM, 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 protein, extended prior branch migration finding with new substrate\",\n      \"pmids\": [\"18843105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FANCM possesses ATP-independent DNA binding activity and ATP-dependent bi-directional branch-point translocation on four-way junction DNA. ATP-dependent activities are required for cellular resistance to mitomycin C but not for monoubiquitination of FANCD2/FANCI; the entire helicase domain (ATP-dependent and independent) is required for monoubiquitination.\",\n      \"method\": \"siRNA complementation, in vitro DNA binding and branch migration assays, mutant analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assays combined with siRNA-based complementation separating two mechanistic functions\",\n      \"pmids\": [\"18285517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FANCM and FAAP24 are required for cell-cycle-dependent chromatin loading of the FA core complex; FANCM is exclusively localized to chromatin and undergoes cell-cycle-dependent phosphorylation. Depletion of FAAP24 disrupts chromatin association of FANCM and destabilizes it, preventing FA core complex recruitment to chromatin.\",\n      \"method\": \"Chromatin fractionation, siRNA depletion, immunofluorescence, co-immunoprecipitation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromatin fractionation with functional consequence, multiple orthogonal methods in single study\",\n      \"pmids\": [\"18174376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FANCM and FAAP24 interact with checkpoint protein HCLK2 independently of the FA core complex. Downregulation of FANCM or FAAP24 compromises ATR/Chk1-mediated checkpoint signaling. The DNA translocase activity of FANCM—dispensable for FA pathway activation—is required for its role in ATR/Chk1 signaling.\",\n      \"method\": \"Co-immunoprecipitation, siRNA depletion, phosphorylation assays, checkpoint marker analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, siRNA depletion with specific phosphorylation readouts, translocase-dead mutant separating two functions\",\n      \"pmids\": [\"18995830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The FANCM ortholog Fml1 in fission yeast promotes Rad51-dependent gene conversion at stalled/blocked replication forks and limits crossing over during mitotic double-strand break repair; in vitro Fml1 catalyzes both replication fork reversal and D-loop disruption.\",\n      \"method\": \"Genetic epistasis in S. pombe, in vitro D-loop disruption and fork reversal assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of D-loop disruption and fork reversal plus genetic epistasis in model organism ortholog\",\n      \"pmids\": [\"18851838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FANCM connects the FA and Bloom Syndrome pathways via two conserved interaction motifs: MM1 interacts with the FA core complex by binding FANCF, and MM2 interacts with RMI1 and topoisomerase IIIα (components of the BLM/BS dissolvasome complex). Both motifs are independently required to activate their respective pathways, and loss of this bridging causes elevated sister chromatid exchanges.\",\n      \"method\": \"Mutant interaction motif analysis, co-immunoprecipitation, sister chromatid exchange assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — defined interaction domains by mutagenesis, functional rescue experiments, replicated by subsequent structural studies\",\n      \"pmids\": [\"20064461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FANCM is hyperphosphorylated and degraded during mitosis; β-TRCP and Plk1 are the key regulators of FANCM degradation. Non-degradable FANCM mutants retain the FA core complex in chromatin and disrupt the FA pathway, revealing a mechanism for cell-cycle-dependent regulation.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative/non-degradable mutant analysis, chromatin fractionation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — identification of specific E3 ligase and kinase with non-degradable mutant functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"19270156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Xenopus egg extracts, xFANCM binds chromatin in a replication-dependent manner and is phosphorylated in response to DNA damage; chromatin binding and phosphorylation are mediated in part by FANCD2 and by checkpoint kinases ATR and ATM.\",\n      \"method\": \"Xenopus egg extract system, chromatin fractionation, immunodepletion, kinase inhibitor experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean biochemical system with fractionation and defined kinase epistasis, but single lab/organism system\",\n      \"pmids\": [\"19633289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FANCM controls DNA chain elongation in an ATPase-dependent manner in vivo; in the presence of replication inhibitors that do not damage DNA, FANCM counteracts fork movement, whereas through damaged DNA FANCM promotes replication and recovers stalled forks. Chk1 signaling prevents FANCM degradation by the proteasome after DNA damage, and FANCM stabilizes Chk1 in a feedback loop.\",\n      \"method\": \"DNA fiber analysis, ATPase-defective mutant, siRNA depletion, proteasome inhibitor experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DNA fiber assay plus ATPase mutant distinguishing two in vivo fork functions, multiple orthogonal methods single lab\",\n      \"pmids\": [\"20010692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FANCM forms a conserved DNA-remodeling complex with the histone-fold heterodimer MHF1-MHF2; MHF stimulates DNA binding and replication fork remodeling by FANCM. FANCM and MHF are rapidly recruited to forks stalled by DNA interstrand crosslinks and are required for cellular resistance. In vertebrates, FANCM-MHF promotes FANCD2 monoubiquitination and suppresses sister chromatid exchanges.\",\n      \"method\": \"Biochemical reconstitution, chromatin immunoprecipitation, siRNA/knockout, FANCD2 monoubiquitination assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution of MHF-stimulated fork remodeling, live-cell recruitment, FANCD2 modification assay; replicated in parallel by Singh et al. (PMID 20347429)\",\n      \"pmids\": [\"20347428\", \"20347429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MHF1 and MHF2 assemble into a heterodimer that binds DNA and enhances the DNA branch migration activity of FANCM; suppression of MHF1 destabilizes FANCM and MHF2, impairs FANCD2 monoubiquitination and foci formation, disrupts chromatin localization of FA core complex proteins, and causes chromosomal instability.\",\n      \"method\": \"siRNA depletion, co-immunoprecipitation, DNA binding assay, branch migration assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro DNA binding and branch migration assay combined with cellular epistasis; concurrent with and consistent with Yan et al. (PMID 20347428)\",\n      \"pmids\": [\"20347429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FANCM and FAAP24 are specifically required for recruitment of RPA to ICL-stalled replication forks; ICL-induced RPA foci formation requires the DNA-binding activity of FAAP24 but not the DNA translocase activity of FANCM; FANCM/FAAP24-dependent RPA recruitment is required for efficient ATR-mediated checkpoint activation in response to ICL.\",\n      \"method\": \"siRNA depletion, immunofluorescence foci analysis, translocase-dead mutant, ATR substrate phosphorylation assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — separation-of-function mutagenesis (translocase vs. DNA-binding) with specific RPA foci and checkpoint readouts, multiple orthogonal methods\",\n      \"pmids\": [\"20670894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FANCM promotes replication fork restart and limits accumulation of RPA-ssDNA; in DT40 cells this process is controlled by ATR and PLK1. FANCM promotes chromatin retention of TopBP1, and failure to retain TopBP1 impairs ATR phosphorylation of downstream targets including Chk1 and SMC1.\",\n      \"method\": \"DT40 knockout, DNA fiber analysis, chromatin fractionation, epistasis with ATR/PLK1 inhibitors\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout in DT40 with DNA fiber analysis, chromatin fractionation of TopBP1, specific downstream phosphorylation readouts\",\n      \"pmids\": [\"20057355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structures of MHF1-MHF2 alone and bound to FANCM fragment (residues 661-800) show MHF forms a compact tetramer; FANCM binds through a 'dual-V' shaped structure; FANCM and (MHF1-MHF2)2 cooperate to form a new DNA-binding site coupled to the canonical L1L2 region. A disease-associated FANCM mutant alters the MHF-FANCM interaction and subcellular localization.\",\n      \"method\": \"X-ray crystallography, mutagenesis, subcellular localization assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure at atomic resolution combined with mutagenesis validation and in vivo localization assay\",\n      \"pmids\": [\"22510687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The X-ray crystal structure of the RMI core complex bound to a conserved FANCM peptide shows FANCM binds both RMI1 and RMI2 through a hydrophobic 'knobs-into-holes' arrangement. Alanine substitutions at key interface residues strongly destabilize the complex and increase SCE levels comparable to BLM- or FANCM-deficient cells.\",\n      \"method\": \"X-ray crystallography, mutagenesis, co-immunoprecipitation, sister chromatid exchange assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis validation and functional SCE assay in cells\",\n      \"pmids\": [\"22392978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FANCM translocase activity is essential for promoting replication fork stability; cells expressing translocase-defective FANCM show increased stalled forks that degenerate into DSBs leading to ATM activation, CtIP-dependent end resection, and homologous recombination repair.\",\n      \"method\": \"Translocase-dead mutant knock-in, DNA fiber analysis, ATM activation assays, genetic epistasis with ATM/CtIP\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — separation-of-function mutant with DNA fiber analysis and multiple downstream pathway readouts, genetic epistasis\",\n      \"pmids\": [\"22279085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FANCM/MHF complex translocase and DNA-binding activities promote replication traverse of DNA interstrand crosslinks, allowing DNA synthesis to continue past ICLs without lesion repair; inactivation of translocase or DNA-binding activities strongly reduces traverse frequency.\",\n      \"method\": \"Single-molecule visualization of replication fork encounters with ICLs in living cells, translocase-dead and DNA-binding mutants\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — novel single-molecule technique in living cells with separation-of-function mutants, directly demonstrating the traverse mechanism\",\n      \"pmids\": [\"24207054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FANCM and FAAP24 possess non-overlapping functions: FAAP24 promotes ATR-mediated checkpoint activation in response to DNA crosslinking agents, whereas FANCM participates in recombination-independent ICL repair by facilitating recruitment of lesion incision activities requiring its translocase activity.\",\n      \"method\": \"Isogenic FANCM and FAAP24 knockout cell lines, epistasis analysis, DNA repair assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean isogenic knockouts with multiple orthogonal assays separating FANCM and FAAP24 functions\",\n      \"pmids\": [\"23333308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of the C-terminal segment of FANCM in complex with FAAP24 reveals both proteins have a nuclease domain and tandem helix-hairpin-helix (HhH)2 domain; variations in key residues render FANCM's nuclease domain catalytically inactive; the first HhH motif of FAAP24 is a DNA-binding site critical for targeting FANCM-FAAP24 to chromatin.\",\n      \"method\": \"X-ray crystallography, mutagenesis, chromatin-targeting assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis and functional chromatin targeting validation\",\n      \"pmids\": [\"24003026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Structure of FANCM C-terminal domain (FANCMCTD) bound to FAAP24 and DNA reveals the FANCM (HhH)2 domain is buried while FAAP24 (HhH)2 domain engages DNA; a second DNA contact and metal center in the FANCM pseudo-nuclease domain are required for double-stranded DNA binding in vitro and FANCM-FAAP24 function in vivo. EM shows the translocase domain lies in proximity to FANCMCTD.\",\n      \"method\": \"X-ray crystallography, electron microscopy, mutagenesis, in vitro DNA binding, in vivo complementation\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis, EM, and in vivo functional validation\",\n      \"pmids\": [\"23932590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ATR-dependent phosphorylation of FANCM at serine 1045 in response to genotoxic stress is required for FANCM functions including FA pathway integrity, recruitment of FANCM to ICL sites, preventing premature mitotic entry, and efficient CHK1 and G2/M checkpoint activation, establishing an ATR-FANCM feedback loop.\",\n      \"method\": \"Phospho-specific antibody, ATR inhibition, phosphorylation-defective mutant (S1045A), checkpoint activation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific phosphosite identified, ATR dependence established, phospho-dead mutant with multiple functional readouts\",\n      \"pmids\": [\"23698467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of MHF bound to the MHF-interaction domain (MID) of FANCM shows one MHF heterotetramer wrapped by a single MID polypeptide; a zinc atom-liganding structure at the interface stabilizes the complex; MID binding switches MHF DNA-binding preference from duplex DNA to branched DNA. Mutations disrupting the composite DNA-binding surface or protein-protein interface impair FA network activation and genome stability.\",\n      \"method\": \"X-ray crystallography, structure-guided mutagenesis, DNA binding assays, FANCD2 monoubiquitination assay\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with structure-guided mutagenesis and functional validation of DNA-binding switch mechanism\",\n      \"pmids\": [\"24699063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FANCM interacts with PCNA through a conserved PIP-box motif; the interaction is strongly stimulated by replication stress. A PIP-box mutant FANCM variant is defective in promoting replication traverse of ICLs and inefficient in promoting FANCD2 monoubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, PIP-box mutant analysis, ICL traverse assay, FANCD2 monoubiquitination assay, structural analysis of archaeal Hef-PCNA interaction\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PIP-box mutant with two orthogonal functional assays (traverse and monoubiquitination), conservation confirmed in archaeal homolog\",\n      \"pmids\": [\"26825464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FANCM recruitment to ICL-stalled replication forks depends on its intrinsic DNA translocase activity, FAAP24 DNA-binding, ATR kinase activity, and direct interaction with the BLM-TOP3A-RMI (BTR) complex including the helicase activity of BLM; this recruitment is independent of the FA core complex and FANCD2-FANCI. The FANCM-BLM interaction is critical for FANCM hyperphosphorylation, FA pathway activation, and ICL traverse.\",\n      \"method\": \"Novel FANCM-recruitment protocol, translocase-dead and interaction mutants, co-immunoprecipitation, epistasis analysis\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — newly developed recruitment assay with separation-of-function mutants and comprehensive epistasis analysis\",\n      \"pmids\": [\"28058110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FANCM depletion induces replication stress primarily at telomeres of ALT cells; FANCM, BRCA1, and BLM are actively recruited to ALT telomeres experiencing replication stress; BRCA1 and BLM recruitment is interdependent and regulated by ATR and Chk1. In FANCM-depleted ALT cells, BRCA1 and BLM resolve telomeric replication stress by stimulating DNA end resection and homologous recombination.\",\n      \"method\": \"siRNA depletion, telomere-specific single-molecule analysis of replicated DNA (SMARD), co-depletion epistasis, immunofluorescence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-molecule DNA replication analysis, multiple co-depletions defining epistatic pathway, specific recruitment readouts\",\n      \"pmids\": [\"28673972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The ATPase/translocase activity of FANCM keeps telomeric replicative stress in check in ALT cells by suppressing BLM-driven telomere stress and by unwinding telomeric R-loops (TERRA R-loops) in vitro; FANCM depletion increases ALT-associated marks, de novo telomeric DNA synthesis, and BLM-dependent telomere dysfunction. RNaseH1 overexpression abrogates residual replication stress in FANCM+BLM co-depleted cells.\",\n      \"method\": \"siRNA/shRNA depletion, in vitro R-loop unwinding assay, ALT biomarker analysis, epistasis with BLM depletion and RNaseH1 overexpression\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro R-loop unwinding combined with multiple in-cell epistasis experiments; three independent labs converged on similar conclusions (PMIDs 31138795, 31138797, 31836759)\",\n      \"pmids\": [\"31138795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FANCM-mediated attenuation of ALT requires its DNA translocase activity and interaction with the BTR (BLM-TOP3A-RMI) complex but does not require the FA core complex. FANCM depletion provokes ALT activity via increased break-induced telomere synthesis. Synthetic inhibition of FANCM-BTR complex formation is selectively toxic to ALT cancer cells.\",\n      \"method\": \"siRNA/shRNA depletion, translocase-dead mutant, BTR interaction mutant, break-induced replication assay, ALT biomarker analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — separation-of-function mutants (translocase-dead vs. BTR-interaction mutant) with defined ALT pathway readouts; consistent with concurrent parallel study\",\n      \"pmids\": [\"31138797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FANCM (via FAAP24 interaction) disrupts TERRA R-loops at ALT telomeres; depletion of FAAP24 or FANCM induces dramatic increase of C-circle formation driven by ATR/Chk1, BTR complex, HR proteins (BRCA2, PALB2, RAD51), and BIR factors (POLD1, POLD3). RNase H1 overexpression attenuates ALT phenotypes caused by FANCM deficiency.\",\n      \"method\": \"siRNA depletion of FANCM complex components, C-circle assay, co-depletion epistasis, RNaseH1 overexpression\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comprehensive epistasis with multiple pathway components and R-loop rescue experiment; consistent with concurrent independent labs\",\n      \"pmids\": [\"31836759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FANCM binds the replisome complex following ICL introduction in an ATR- and FANCD2-dependent but FA core protein- and FAAP24-independent manner, with concomitant release of GINS proteins from the CMG helicase. ATR-dependent phosphorylated FANCM promotes this replisome remodeling.\",\n      \"method\": \"Proximity ligation and co-immunoprecipitation with replisome components, GINS release assay, ATR inhibition, in situ replisome analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in-cell replisome co-IP plus in situ GINS release analysis with genetic epistasis (ATR/FANCD2 dependence)\",\n      \"pmids\": [\"31067464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Distinct FANCM repair functions at stalled forks are enacted by molecularly separable scaffolding domains; FANCM ATPase function is required for all its repair functions and its inactivation 'traps' FANCM at stalled forks. Brca1 hypomorphic mutants are synthetic lethal with Fancm null or Fancm ATPase-defective mutants.\",\n      \"method\": \"Endogenous Fancm domain-specific mutations in mouse ES cells, DNA repair assays, synthetic lethality analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined endogenous mutations with multiple repair readouts and synthetic lethality testing in physiological model\",\n      \"pmids\": [\"33882298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"And-1 (a replisome protein) is critical for activation of the FA pathway by sensing ICL-stalled forks and recruiting the FANCM/FAAP24 complex to ICLs; this requires ATR-induced phosphorylation of And-1 at T826, which triggers an intramolecular change promoting And-1 interaction with FANCM/FAAP24.\",\n      \"method\": \"Co-immunoprecipitation, phospho-specific antibody, phospho-dead mutant (T826A), FANCD2 monoubiquitination assay, chromatin recruitment assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific phosphosite with phospho-dead mutant, co-IP demonstrating interaction, and FANCD2 monoubiquitination as functional readout\",\n      \"pmids\": [\"35867033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Hel2i subdomain within the N-terminal translocase domain is crucial for FANCM's specific branched DNA engagement, coupling DNA binding to catalytic ATP-dependent branch migration. Mutations in Hel2i or key DNA-binding residues diminish junction DNA affinity and abolish branch migration activity, and these mutants fail to rescue ALT cell death or telomere replication stress upon FANCM depletion.\",\n      \"method\": \"Mutagenesis of Hel2i subdomain, DNA binding assays, branch migration assay, ALT cell rescue assay, cell cycle and telomere stress assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assays with domain-specific mutants combined with in-cell functional rescue, mechanistic domain mapping\",\n      \"pmids\": [\"39189453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structures of FANCM's N-terminal translocase domain (2.2 Å) and C-terminal FAAP24-bound region (2.4 Å), both complexed with branched DNA, reveal two distinct mechanisms: (1) ATP-dependent branch migration essential for DNA damage survival, and (2) a branched DNA-binding mode at the C-terminal domain that enhances FANCD2-FANCI monoubiquitination through FA core complex interaction.\",\n      \"method\": \"X-ray crystallography, biochemical reconstitution, mutagenesis, FANCD2-FANCI monoubiquitination assay, cellular rescue experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution crystal structures combined with biochemical reconstitution, mutagenesis, and functional cellular validation of two distinct mechanisms\",\n      \"pmids\": [\"40447800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SMARCAL1 displays a profound synthetic-lethal interaction with FANCM; combined loss causes severe genome instability linked to chromosome breakage at simple repeat loci that challenge replication fork progression.\",\n      \"method\": \"CRISPR-based synthetic lethality screen, double-knockout cell lines, genomic instability assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-based screen with double-KO validation and defined chromosomal instability phenotype at specific genomic loci\",\n      \"pmids\": [\"39510066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FANCM promotes PARP inhibitor resistance independent of the FA core complex by minimizing ssDNA gap formation behind replication forks through counteracting 53BP1; FANCM depletion leads to increased ssDNA gaps (via 53BP1- and PRIMPOL-dependent mechanisms) and reduced resection of collapsed forks, while 53BP1 deletion restores resection and mitigates PARPi sensitivity.\",\n      \"method\": \"siRNA depletion, ssDNA gap assay, genetic epistasis with 53BP1 and PRIMPOL, DNA fiber analysis, resection assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal assays including ssDNA gap quantification, resection assay, and genetic epistasis with 53BP1 deletion rescue\",\n      \"pmids\": [\"38985669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Walker B motif mutation in avian FANCM (DT40 cells) does not affect FA pathway activation or crosslink repair, but results in elevated sister chromatid exchanges; FANCM functions with BLM helicase to suppress spontaneous SCE events, placing them in the same pathway.\",\n      \"method\": \"DT40 knockout complementation with Walker B mutant, sister chromatid exchange assay, epistasis with BLM\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — separation-of-function Walker B mutant with SCE assay and BLM epistasis in clean DT40 system\",\n      \"pmids\": [\"19465393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FANCM, along with FAAP24 and MHF1/2, is recruited to CFS-derived structure-prone AT-rich sequences and suppresses DSB formation and mitotic recombination there in a manner dependent on FANCM translocase activity; this function is independent of the FA core complex and FANCI-FANCD2 complex.\",\n      \"method\": \"FANCM knockout, translocase-dead mutant, DSB assays at AT-rich sequences, epistasis with FA complex components\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — translocase-dead separation-of-function mutant with FA complex epistasis defining an independent function at common fragile sites\",\n      \"pmids\": [\"30022024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In C. elegans, FANCM/CeFNCM-1 interacts with the histone demethylase LSD1/CeSPR-5; LSD1/CeSPR-5 is required for replication stress-induced S-phase checkpoint activation; FANCM relocalizes upon hydroxyurea exposure and colocalizes with FANCD2/CeFCD-2 and LSD1/CeSPR-5. The FA pathway is required for H3K4me2 maintenance.\",\n      \"method\": \"Co-immunoprecipitation, fluorescence microscopy, genetic epistasis in C. elegans\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and colocalization in C. elegans ortholog, genetic epistasis establishing connection to histone methylation maintenance, single lab\",\n      \"pmids\": [\"29588287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In budding yeast, Mph1 (FANCM ortholog) prevents precocious DSB strand exchange between sister chromatids before homologs complete pairing by dissociating precocious D-loops between sister chromatids; this ensures high levels of crossovers and non-crossovers between homologs. Later recombination events are protected from Mph1-mediated dissociation by synapsis protein Zip1.\",\n      \"method\": \"Yeast genetics, D-loop dissociation assay, meiotic recombination analysis, Zip1 epistasis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct D-loop dissociation activity linked to meiotic phenotype with Zip1 protection mechanism established by epistasis\",\n      \"pmids\": [\"32386601\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FANCM is an ATP-dependent DNA translocase/branchpoint migrase that recognizes branched DNA structures (stalled replication forks, Holliday junctions, R-loops) through its N-terminal translocase domain (particularly the Hel2i subdomain) and promotes fork reversal, branch migration, and replication traverse of interstrand crosslinks; it serves as a molecular scaffold that recruits the FA core complex to chromatin (via FAAP24 and a C-terminal FANCF-binding motif MM1), links the FA and Bloom syndrome dissolvasome pathways (via RMI1/RMI2 binding through motif MM2), facilitates ATR/CHK1 checkpoint activation, undergoes ATR-dependent phosphorylation at S1045 and mitotic Plk1/β-TRCP-driven degradation for cell-cycle regulation, suppresses toxic R-loop accumulation at ALT telomeres to restrain break-induced telomere synthesis, and limits meiotic crossovers by disassembling D-loops to promote non-crossover synthesis-dependent strand annealing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FANCM is an ATP-dependent DNA translocase and branch-point migrase that recognizes branched DNA intermediates—Holliday junctions, replication forks, and D-loops—and remodels them to preserve genome stability during replication stress [#1, #3]. Through its N-terminal translocase domain it catalyzes bidirectional branch migration and replication fork reversal in an ATPase-dependent manner [#1, #2], with the Hel2i subdomain coupling specific branched-DNA engagement to catalytic migration [#33, #34]. Beyond its enzymatic activity, FANCM serves as a chromatin-targeting scaffold that loads the Fanconi anemia core complex onto chromatin in a cell-cycle-dependent manner and is required for normal FANCD2 monoubiquitination [#4, #0]; it bridges the FA and Bloom syndrome dissolvasome pathways through two conserved motifs—MM1 binding the core complex via FANCF and MM2 binding RMI1/topoisomerase IIIα—with loss of bridging elevating sister chromatid exchange [#7, #16]. FANCM functions in a stable heterodimeric module with the histone-fold proteins MHF1-MHF2, which stimulate its DNA binding and fork-remodeling activity and switch its DNA-binding preference toward branched DNA [#11, #23], and it partners with FAAP24, whose DNA-binding (HhH)2 domain targets the complex to chromatin [#0, #20]. Functionally distinct activities are separable: the translocase activity is dispensable for FA pathway activation but required for replication fork stability, ICL traverse, ATR/CHK1 checkpoint signaling, and recovery of stalled forks [#3, #5, #17, #18], and FANCM facilitates ATR checkpoint activation by promoting RPA and TopBP1 chromatin retention [#13, #14]. FANCM is regulated by ATR-dependent phosphorylation at S1045 and by Plk1/β-TRCP-driven mitotic degradation that releases the core complex from chromatin [#22, #8]. At ALT telomeres, its translocase activity and BTR-complex interaction suppress TERRA R-loops and BLM-driven break-induced telomere synthesis, rendering FANCM-BTR disruption selectively toxic to ALT cancer cells [#27, #28], and FANCM loss is synthetic-lethal with BRCA1 hypomorphs and with SMARCAL1 [#31, #35]. The ortholog studies establish a conserved role in limiting recombination outcomes by dissociating D-loops, including meiotic crossover control [#6, #40].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that FANCM operates within a defined protein assembly and links DNA-structure recognition to the FA pathway, identifying FAAP24 as its targeting partner required for FANCD2 monoubiquitination.\",\n      \"evidence\": \"Co-IP, siRNA depletion, and cellular sensitivity assays defining the FANCM-FAAP24 interaction\",\n      \"pmids\": [\"17289582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether FANCM itself is the catalytic translocase\", \"Mechanism of structure recognition unresolved at this stage\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the core biochemical activity of FANCM by showing it is an ATP-dependent branch-point migrase and fork-reversal enzyme acting directly on branched DNA, separating this enzymatic role from its requirement for FANCD2 monoubiquitination.\",\n      \"evidence\": \"In vitro reconstitution with purified protein, ATPase/Walker-B-defective mutants, branch migration and fork reversal assays, siRNA complementation\",\n      \"pmids\": [\"18206976\", \"18843105\", \"18285517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How translocase activity contributes in vivo not yet shown\", \"Substrate selectivity determinants within the protein unmapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed FANCM is a chromatin-localized scaffold whose recruitment, together with FAAP24, is required to load the FA core complex onto chromatin, and that it also feeds ATR/CHK1 checkpoint signaling via HCLK2 independently of the core complex.\",\n      \"evidence\": \"Chromatin fractionation, siRNA depletion, immunofluorescence, Co-IP, and translocase-dead mutant analysis\",\n      \"pmids\": [\"18174376\", \"18995830\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise determinants of cell-cycle-regulated chromatin loading unresolved\", \"How translocase activity drives checkpoint signaling mechanistically unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated through the fission yeast ortholog Fml1 that the branch-migration/D-loop-disruption activity is evolutionarily conserved and channels stalled-fork repair toward Rad51-dependent gene conversion while limiting crossovers.\",\n      \"evidence\": \"Genetic epistasis in S. pombe and in vitro D-loop disruption and fork reversal assays\",\n      \"pmids\": [\"18851838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conservation of crossover-limiting function in vertebrates not addressed here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed how FANCM is regulated across the cell cycle and the replication-stress response, showing mitotic Plk1/β-TRCP degradation releases the core complex and that Chk1 signaling stabilizes FANCM in a feedback loop while it controls fork elongation.\",\n      \"evidence\": \"Non-degradable and ATPase-defective mutants, chromatin fractionation, DNA fiber analysis, proteasome inhibition, and Xenopus extract phosphorylation studies\",\n      \"pmids\": [\"19270156\", \"20010692\", \"19633289\", \"19465393\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosites driving degradation not fully mapped\", \"Walker-B mutant SCE phenotype mechanism beyond BLM epistasis incomplete\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established FANCM as a constitutive partner of the histone-fold heterodimer MHF1-MHF2, which stimulates its DNA binding and fork remodeling and is needed for FANCD2 monoubiquitination and suppression of chromosomal instability.\",\n      \"evidence\": \"Biochemical reconstitution, ChIP, siRNA/knockout, branch migration assays, and FANCD2 monoubiquitination readouts\",\n      \"pmids\": [\"20347428\", \"20347429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of MHF stimulation not yet resolved at this point\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined how FANCM/FAAP24 couples to checkpoint activation, showing it recruits RPA and retains TopBP1 at ICL-stalled forks to enable ATR phosphorylation of CHK1 and SMC1, with RPA recruitment dependent on FAAP24 DNA binding rather than FANCM translocase.\",\n      \"evidence\": \"siRNA depletion, separation-of-function mutants (translocase vs DNA-binding), foci analysis, chromatin fractionation, and ATR substrate readouts in DT40\",\n      \"pmids\": [\"20670894\", \"20057355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TopBP1 retention is physically achieved unresolved\", \"Order of RPA, TopBP1, and core-complex recruitment events not fully ordered\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the structural logic for FANCM's pathway-bridging and DNA-remodeling scaffolds by solving the MHF-FANCM and RMI-FANCM interfaces and linking their disruption to elevated SCE and altered localization.\",\n      \"evidence\": \"X-ray crystallography of MHF1-MHF2-FANCM and RMI core-FANCM peptide complexes with mutagenesis and SCE assays\",\n      \"pmids\": [\"22510687\", \"22392978\", \"20064461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length architecture coupling these modules to the translocase not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Separated the FANCM repair functions in vivo, showing translocase activity is essential for fork stability and that its loss converts stalled forks into DSBs that trigger ATM-CtIP-dependent resection and HR.\",\n      \"evidence\": \"Translocase-dead knock-in, DNA fiber analysis, ATM activation assays, and genetic epistasis\",\n      \"pmids\": [\"22279085\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration of fork reversal as the protective mechanism in cells still pending\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved the FANCM-FAAP24 C-terminal architecture and demonstrated that FANCM mediates replication traverse of ICLs, allowing forks to bypass crosslinks without repair, using both translocase and DNA-binding activities.\",\n      \"evidence\": \"Crystallography and EM of the FANCM-FAAP24 CTD with DNA, single-molecule ICL-traverse imaging in living cells, and separation-of-function mutants\",\n      \"pmids\": [\"24003026\", \"23932590\", \"24207054\", \"23333308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"FANCM nuclease domain is catalytically dead—its structural role remains functional but non-enzymatic\", \"How traverse is coordinated with later repair unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified ATR-FANCM feedback through phosphorylation at S1045, required for FA pathway integrity, ICL-site recruitment, and checkpoint enforcement, establishing post-translational control of FANCM during genotoxic stress.\",\n      \"evidence\": \"Phospho-specific antibody, ATR inhibition, and S1045A mutant with checkpoint readouts\",\n      \"pmids\": [\"23698467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether S1045 phosphorylation directly alters translocase or scaffolding activity not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed the FANCM MID switches MHF DNA-binding preference from duplex to branched DNA via a zinc-stabilized interface, defining a structural mechanism coupling complex assembly to substrate specificity and FA network activation.\",\n      \"evidence\": \"Crystallography of MHF-MID, structure-guided mutagenesis, DNA binding and FANCD2 monoubiquitination assays\",\n      \"pmids\": [\"24699063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequence of the binding-mode switch on specific substrates incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected FANCM directly to the replisome and ICL recognition, showing a stress-stimulated PIP-box interaction with PCNA and a translocase/BTR/ATR-dependent recruitment pathway to ICL-stalled forks that drives hyperphosphorylation and ICL traverse independently of the core complex.\",\n      \"evidence\": \"PIP-box mutant analysis, recruitment assays, Co-IP, and epistasis with BLM, ATR, and FAAP24\",\n      \"pmids\": [\"26825464\", \"28058110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy of PCNA, BTR, and FAAP24 contributions to recruitment not fully ordered\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended FANCM function to telomere maintenance, showing it is recruited to ALT telomeres under replication stress and that its loss provokes BRCA1/BLM-dependent resection and HR to resolve telomeric replication stress.\",\n      \"evidence\": \"siRNA depletion, telomere-specific SMARD, co-depletion epistasis, and immunofluorescence\",\n      \"pmids\": [\"28673972\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical substrate at ALT telomeres not yet defined at this stage\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the mechanism of FANCM at ALT telomeres as translocase-dependent suppression of TERRA R-loops and BLM-driven break-induced telomere synthesis via BTR-complex interaction, revealing FANCM-BTR disruption as selectively toxic to ALT cancers.\",\n      \"evidence\": \"In vitro R-loop unwinding, translocase-dead and BTR-interaction mutants, C-circle and break-induced replication assays, and RNase H1 rescue across three independent labs\",\n      \"pmids\": [\"31138795\", \"31138797\", \"31836759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether R-loop unwinding is the sole protective activity at telomeres not fully isolated\", \"Therapeutic window of FANCM-BTR disruption in vivo unaddressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed FANCM remodels the stalled replisome after ICL encounter, binding the replisome in an ATR/FANCD2-dependent manner and triggering GINS release from CMG, linking FANCM phosphorylation to active replisome restructuring.\",\n      \"evidence\": \"Proximity ligation and Co-IP with replisome components, GINS-release assay, and ATR inhibition\",\n      \"pmids\": [\"31067464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct enzymatic basis for GINS release not established\", \"Fate of the remodeled replisome unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated that FANCM repair functions partition among molecularly separable scaffolding domains while ATPase activity is universally required, and that FANCM loss or ATPase inactivation is synthetic-lethal with BRCA1 hypomorphs, defining therapeutic vulnerability.\",\n      \"evidence\": \"Endogenous domain-specific Fancm mutations in mouse ES cells, repair assays, and synthetic-lethality testing\",\n      \"pmids\": [\"33882298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular trigger of FANCM trapping at forks upon ATPase inactivation unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified And-1 as a replisome sensor of ICL-stalled forks that recruits FANCM/FAAP24 via ATR-induced phosphorylation, placing FANCM recruitment downstream of a defined replisome-resident signal.\",\n      \"evidence\": \"Co-IP, phospho-specific antibody, And-1 T826A mutant, chromatin recruitment, and FANCD2 monoubiquitination assays\",\n      \"pmids\": [\"35867033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether And-1 and PCNA recruitment routes are redundant or sequential unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Pinned down the structural and catalytic basis of FANCM's two activities, showing the Hel2i subdomain mediates branched-DNA engagement and ATP-dependent migration, while the C-terminal branched-DNA-binding mode enhances FANCD2-FANCI monoubiquitination through FA core complex interaction.\",\n      \"evidence\": \"Atomic-resolution crystal structures of N-terminal translocase and C-terminal FAAP24-bound regions with branched DNA, Hel2i mutagenesis, biochemical reconstitution, and ALT/monoubiquitination rescue assays\",\n      \"pmids\": [\"39189453\", \"40447800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length conformational coupling between the two domains during catalysis not yet captured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Expanded the genome-protective network of FANCM, revealing synthetic lethality with SMARCAL1 at replication-challenging repeats and a core-complex-independent role in suppressing 53BP1/PRIMPOL-driven ssDNA gaps that confers PARP inhibitor resistance.\",\n      \"evidence\": \"CRISPR synthetic-lethality screen with double knockouts, ssDNA gap and resection assays, and genetic epistasis with 53BP1 and PRIMPOL\",\n      \"pmids\": [\"39510066\", \"38985669\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which FANCM counteracts 53BP1 at gaps unresolved\", \"Whether translocase activity is required for gap suppression not isolated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FANCM's separable enzymatic and scaffolding activities are dynamically switched and coordinated in real time across distinct genomic contexts (forks, ICLs, ALT telomeres, fragile sites) by phosphorylation, partner binding, and conformational change remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified model linking domain coupling to context-specific output\", \"Full-length structure during catalysis not determined\", \"Regulatory integration of ATR phosphorylation with degradation and recruitment incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1, 2, 3, 17, 18, 33]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 3, 20, 21, 33, 34]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [1, 2, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 7, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 13, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [4, 8, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 3, 11, 18, 19]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [2, 14, 17, 30]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [5, 13, 14, 22]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [27, 28, 31, 35, 36]}\n    ],\n    \"complexes\": [\n      \"FANCM-FAAP24\",\n      \"FANCM-MHF1-MHF2\",\n      \"Fanconi anemia core complex\",\n      \"BLM-TOP3A-RMI (BTR) dissolvasome\"\n    ],\n    \"partners\": [\n      \"FAAP24\",\n      \"MHF1\",\n      \"MHF2\",\n      \"FANCF\",\n      \"RMI1\",\n      \"BLM\",\n      \"PCNA\",\n      \"And-1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}