{"gene":"FANCE","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2002,"finding":"FANCE is a component of the nuclear FA core complex, binding directly to both FANCC and FANCD2. FANCE is required for nuclear accumulation of FANCC, formation of the FANCA-FANCC complex, monoubiquitination of FANCD2, and FANCD2 nuclear foci assembly. Disease-associated FANCC mutants that do not bind FANCE cannot accumulate in the nucleus and are unable to prevent chromosome breakage.","method":"Retroviral transduction of FA-E cells, co-immunoprecipitation, nuclear fractionation, immunofluorescence","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and functional rescue experiments in FA-deficient cells, replicated across two independent papers (PMID 12093742, 12239156)","pmids":["12093742"],"is_preprint":false},{"year":2002,"finding":"FANCE promotes nuclear accumulation of FANCC and is itself a nuclear protein that co-immunoprecipitates with FANCA, FANCC, and FANCG (but not FANCD2) in normal cells. FANCE is required for monoubiquitination of FANCD2 and downstream events in the FA pathway.","method":"Retroviral transduction of FA-E cells, co-immunoprecipitation, HA-tagging and immunofluorescence localization, functional complementation (MMC resistance)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, localization, functional rescue), independently consistent with PMID 12093742","pmids":["12239156"],"is_preprint":false},{"year":2005,"finding":"FANCE mediates a ternary complex with FANCC and FANCD2. Using yeast three-hybrid and two-hybrid systems confirmed in human cells, FANCE bridges FANCC and FANCD2. FANCE mutants that interact with FANCC but not FANCD2 abolish FANCD2 monoubiquitination and sensitize cells to DNA cross-linkers. FANCE also mediates interaction between FANCC and FANCF within the core complex.","method":"Yeast two-hybrid, yeast three-hybrid, co-immunoprecipitation in human cells, random mutagenesis screen, functional complementation assay (MMC sensitivity, FANCD2 monoubiquitination)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (two-hybrid, three-hybrid, human cell Co-IP, mutagenesis, functional readout) in a single rigorous study","pmids":["16127171"],"is_preprint":false},{"year":2007,"finding":"In response to DNA damage, Chk1 directly phosphorylates FANCE at two conserved sites: threonine 346 and serine 374. Phosphorylated FANCE assembles into nuclear foci and co-localizes with FANCD2. A non-phosphorylatable FANCE mutant (T346A/S374A) permits FANCD2 monoubiquitination and foci formation but fails to complement MMC hypersensitivity, indicating a FANCD2 monoubiquitination-independent function of Chk1-mediated FANCE phosphorylation in DNA cross-link repair.","method":"In vitro kinase assay with recombinant Chk1 and FANCE, site-directed mutagenesis, retroviral transduction of FANCE-deficient cells, immunofluorescence, MMC sensitivity assay, S-phase progression analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with mutagenesis plus functional cellular complementation, multiple orthogonal methods in one study","pmids":["17296736"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of human FANCE reveals a repeated helical motif (HEAT-like repeats). The crystallographically defined portion of FANCE is sufficient for interaction with FANCD2. Disease-associated mutations in FANCE disrupt the FANCE-FANCD2 interaction, providing structural insight into FA pathogenesis.","method":"X-ray crystallography, structure-guided mutagenesis, binding assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional validation of disease mutations and FANCD2 interaction, single lab but rigorous methods","pmids":["17308347"],"is_preprint":false},{"year":2006,"finding":"Nuclear accumulation of FANCE depends on FANCC but not on other FA proteins (FANCA, FANCG, FANCF). Adding a nuclear export signal does not prevent FANCE nuclear localization, indicating the NLS motifs alone are not sufficient. The region of FANCE that binds FANCC is distinct from the region that binds FANCD2, supporting a model in which FANCE recruits FANCD2 to the core complex independently of FANCC binding.","method":"Retroviral transduction of FA-deficient cell lines, nuclear/cytoplasmic fractionation, immunofluorescence, nuclear export signal (NES) fusion constructs","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple FA-deficient cell line experiments with fractionation and NES constructs, single lab","pmids":["16513431"],"is_preprint":false},{"year":2014,"finding":"The extreme C-terminus of FANCE (phenylalanine 522) is a critical residue for mediating monoubiquitination of the FANCD2-FANCI complex. An interaction-deficient FANCE mutant (disrupting FANCE-FANCD2 binding at the C-terminus) confers cellular sensitivity to cisplatin comparable to FANCE-null cells. Ectopic expression of the FANCE C-terminus fragment alone in normal cells disrupts DNA repair, confirming the FANCE-FANCD2 interaction is required for DNA cross-link repair.","method":"Site-directed mutagenesis, retroviral expression in FANCE-deficient cells, ubiquitination assay (FANCD2-FANCI monoubiquitination), cisplatin sensitivity assay, domain expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis with functional readouts (ubiquitination, DNA repair, drug sensitivity), multiple orthogonal methods, single lab","pmids":["24451376"],"is_preprint":false},{"year":1999,"finding":"The FANCE gene was mapped to chromosome 6p21-22 using homozygosity mapping and genetic linkage analysis in FA complementation group E families.","method":"Homozygosity mapping, genetic linkage analysis, cell fusion complementation analysis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic mapping with complementation analysis, foundational localization study, single study","pmids":["10205272"],"is_preprint":false},{"year":2015,"finding":"A splice isoform of FANCE (FANCEΔ4, lacking exon 4) is expressed in normal and breast cancer cell lines. FANCEΔ4 is translated into a nuclear protein but cannot support FANCD2 or FANCI monoubiquitination, fails to rescue MMC-induced G2/M block or cell survival in FANCE-deficient cells, and promotes degradation of FANCD2 protein. FANCEΔ4 interacts with wild-type FANCE and may act as a dominant negative regulator of FANCE activity.","method":"Retroviral transduction of EUFA130 (FANCE-deficient) cells, cell viability assays, flow cytometry (cell cycle), immunoblot (FANCD2/FANCI monoubiquitination), co-immunoprecipitation, immunofluorescence","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays in FA-deficient cells with Co-IP, single lab","pmids":["26277624"],"is_preprint":false},{"year":2023,"finding":"The FANCC-FANCE-FANCF subcomplex is evolutionarily conserved from vertebrates to plants (Arabidopsis). In Arabidopsis meiosis, FANCC, FANCE, and FANCF form a physical complex and act together as anti-crossover factors. Loss of any one of the three genes partially rescues CO-defective mutants and causes synthetic meiotic catastrophe with the pro-CO factor MUS81.","method":"Genetic screen, yeast two-hybrid interaction, plant genetics (double/triple mutants), crossover frequency analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with physical interaction data in an ortholog system (plant), single lab","pmids":["36652992"],"is_preprint":false}],"current_model":"FANCE is a nuclear scaffold subunit of the FA core E3 ubiquitin ligase complex that directly binds FANCC (via its central region) and FANCD2 (via its C-terminal phenylalanine 522), bridging the core complex to its substrate FANCD2 for monoubiquitination; it adopts a HEAT-repeat helical structure, requires FANCC for its own nuclear accumulation, is phosphorylated by Chk1 at T346/S374 in response to DNA damage to perform a FANCD2-monoubiquitination-independent repair function, and together with FANCC and FANCF forms an evolutionarily conserved subcomplex that also suppresses meiotic crossovers."},"narrative":{"mechanistic_narrative":"FANCE is a nuclear subunit of the Fanconi anemia (FA) core complex that functions as a molecular bridge coupling the core complex to its downstream substrate, the FANCD2-FANCI heterodimer [PMID:12093742, PMID:16127171]. It binds FANCC directly and, through a distinct region, contacts FANCD2, thereby recruiting the substrate for monoubiquitination; FANCE is required for nuclear accumulation of FANCC, formation of the FANCA-FANCC complex, FANCD2 monoubiquitination, and FANCD2 nuclear foci assembly [PMID:12093742, PMID:12239156, PMID:16513431]. The FANCC-binding and FANCD2-binding surfaces are separable, and the extreme C-terminal residue phenylalanine 522 is the critical determinant of the FANCD2/FANCI interaction required for substrate monoubiquitination and DNA cross-link repair [PMID:16513431, PMID:24451376]. Structurally FANCE adopts a repeated helical (HEAT-like) fold, and disease-associated mutations map to this domain and disrupt the FANCE-FANCD2 interaction [PMID:17308347]. Beyond its scaffolding role, FANCE is directly phosphorylated by Chk1 at threonine 346 and serine 374 upon DNA damage, an event dispensable for FANCD2 monoubiquitination but required for cross-link repair, defining a separable monoubiquitination-independent function [PMID:17296736]. The FANCC-FANCE-FANCF subcomplex is evolutionarily conserved and additionally acts to suppress meiotic crossovers [PMID:36652992].","teleology":[{"year":1999,"claim":"Before FANCE's molecular role was known, its gene had to be localized; mapping the FA complementation group E locus established the genetic foundation for cloning and functional study.","evidence":"Homozygosity mapping and linkage analysis in FA-E families with cell fusion complementation","pmids":["10205272"],"confidence":"Medium","gaps":["Does not identify the gene product or its biochemical function","No mechanistic role established"]},{"year":2002,"claim":"It was unknown how FANCE fit into the FA pathway; demonstrating that FANCE binds FANCC and FANCD2 and is required for FANCC nuclear accumulation and FANCD2 monoubiquitination placed FANCE as an essential core complex component linking core assembly to substrate activation.","evidence":"Co-IP, nuclear fractionation, immunofluorescence, and functional rescue (MMC resistance) in FA-E cells; two independent papers","pmids":["12093742","12239156"],"confidence":"High","gaps":["Does not define which FANCE regions mediate each interaction","Mechanism of how FANCE drives FANCD2 monoubiquitination not resolved"]},{"year":2005,"claim":"Whether FANCE acts as a passive subunit or an active bridge was unclear; showing FANCE forms a ternary complex bridging FANCC and FANCD2, with separation-of-function mutants that bind FANCC but not FANCD2 abolishing monoubiquitination, established FANCE as the adaptor recruiting the substrate to the core complex.","evidence":"Yeast two- and three-hybrid, human cell Co-IP, random mutagenesis, and functional complementation","pmids":["16127171"],"confidence":"High","gaps":["Does not map the residues responsible for FANCD2 binding","No structural basis for the bridging interaction"]},{"year":2006,"claim":"The basis of FANCE nuclear localization was uncertain; demonstrating that nuclear accumulation depends specifically on FANCC and that FANCC- and FANCD2-binding regions are distinct refined the recruitment model.","evidence":"Fractionation, immunofluorescence, and NES fusion constructs in FA-deficient cell lines","pmids":["16513431"],"confidence":"Medium","gaps":["Single lab","Precise NLS-independent import mechanism not defined"]},{"year":2007,"claim":"The structural architecture and the question of whether FANCE has regulated functions beyond scaffolding were open; the crystal structure revealed a HEAT-like helical fold sufficient for FANCD2 binding, while Chk1 phosphorylation at T346/S374 defined a monoubiquitination-independent repair role.","evidence":"X-ray crystallography with structure-guided mutagenesis; in vitro Chk1 kinase assay, phospho-site mutagenesis, and MMC complementation","pmids":["17308347","17296736"],"confidence":"High","gaps":["The downstream effector of Chk1-phosphorylated FANCE in cross-link repair is unidentified","Full-length structure in complex with partners not solved"]},{"year":2014,"claim":"The exact determinant of the FANCE-FANCD2 interaction was unresolved; identifying C-terminal phenylalanine 522 as critical for FANCD2-FANCI monoubiquitination and cross-link repair pinpointed the substrate-engagement residue.","evidence":"Site-directed mutagenesis, monoubiquitination and cisplatin sensitivity assays, and dominant disruption by C-terminal fragment expression","pmids":["24451376"],"confidence":"High","gaps":["Structural detail of the F522-FANCD2 contact not resolved","How this residue couples to the catalytic FANCL ligase is unclear"]},{"year":2015,"claim":"Whether FANCE activity is endogenously regulated by isoforms was unknown; characterization of the FANCEΔ4 splice variant as a nuclear, monoubiquitination-incompetent dominant-negative that promotes FANCD2 degradation revealed an alternative-splicing layer of FANCE control.","evidence":"Retroviral expression in FANCE-deficient cells, cell cycle and viability assays, monoubiquitination immunoblot, and Co-IP","pmids":["26277624"],"confidence":"Medium","gaps":["Single lab","Physiological regulation and prevalence of FANCEΔ4 not established","Mechanism of FANCD2 degradation not defined"]},{"year":2023,"claim":"Whether the FANCC-FANCE-FANCF module has functions beyond the canonical core complex was open; showing this subcomplex is conserved to plants and acts as an anti-crossover factor in meiosis extended FANCE's role to recombination regulation.","evidence":"Genetic screen, yeast two-hybrid, and meiotic crossover analysis in Arabidopsis mutants","pmids":["36652992"],"confidence":"Medium","gaps":["Demonstrated in an ortholog system, not human cells","Molecular mechanism of crossover suppression unresolved"]},{"year":null,"claim":"The downstream effector and molecular mechanism by which Chk1-phosphorylated FANCE promotes cross-link repair independently of FANCD2 monoubiquitination remain unidentified.","evidence":"","pmids":[],"confidence":"High","gaps":["No effector identified for the monoubiquitination-independent FANCE function","No structure of full-length FANCE within the assembled core complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,5,6]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,5]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,3,6]}],"complexes":["FA core complex","FANCC-FANCE-FANCF subcomplex"],"partners":["FANCC","FANCD2","FANCA","FANCG","FANCF","FANCI","CHEK1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9HB96","full_name":"Fanconi anemia group E protein","aliases":[],"length_aa":536,"mass_kda":58.7,"function":"As part of the Fanconi anemia (FA) complex functions in DNA cross-links repair. Required for the nuclear accumulation of FANCC and provides a critical bridge between the FA complex and FANCD2","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9HB96/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FANCE","classification":"Not Classified","n_dependent_lines":94,"n_total_lines":1208,"dependency_fraction":0.07781456953642384},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FANCE","total_profiled":1310},"omim":[{"mim_id":"613976","title":"FANCE GENE; FANCE","url":"https://www.omim.org/entry/613976"},{"mim_id":"613899","title":"FANCC GENE; FANCC","url":"https://www.omim.org/entry/613899"},{"mim_id":"613897","title":"FANCF GENE; FANCF","url":"https://www.omim.org/entry/613897"},{"mim_id":"607139","title":"FANCA GENE; FANCA","url":"https://www.omim.org/entry/607139"},{"mim_id":"604610","title":"RECQ PROTEIN-LIKE 3; RECQL3","url":"https://www.omim.org/entry/604610"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Mitotic chromosome","reliability":"Additional"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FANCE"},"hgnc":{"alias_symbol":["FAE"],"prev_symbol":["FACE"]},"alphafold":{"accession":"Q9HB96","domains":[{"cath_id":"-","chopping":"22-110","consensus_level":"medium","plddt":85.3646,"start":22,"end":110},{"cath_id":"1.25.40.480","chopping":"283-446","consensus_level":"medium","plddt":92.6216,"start":283,"end":446},{"cath_id":"-","chopping":"465-536","consensus_level":"medium","plddt":91.3669,"start":465,"end":536}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HB96","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HB96-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HB96-F1-predicted_aligned_error_v6.png","plddt_mean":76.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FANCE","jax_strain_url":"https://www.jax.org/strain/search?query=FANCE"},"sequence":{"accession":"Q9HB96","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HB96.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HB96/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HB96"}},"corpus_meta":[{"pmid":"3756376","id":"PMC_3756376","title":"Understanding face recognition.","date":"1986","source":"British journal of psychology (London, England : 1953)","url":"https://pubmed.ncbi.nlm.nih.gov/3756376","citation_count":2329,"is_preprint":false},{"pmid":"17158117","id":"PMC_17158117","title":"CTX-M: changing the face of ESBLs in Europe.","date":"2006","source":"The Journal of antimicrobial chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/17158117","citation_count":685,"is_preprint":false},{"pmid":"16276354","id":"PMC_16276354","title":"Subcortical face processing.","date":"2005","source":"Nature reviews. 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FANCE is required for nuclear accumulation of FANCC, formation of the FANCA-FANCC complex, monoubiquitination of FANCD2, and FANCD2 nuclear foci assembly. Disease-associated FANCC mutants that do not bind FANCE cannot accumulate in the nucleus and are unable to prevent chromosome breakage.\",\n      \"method\": \"Retroviral transduction of FA-E cells, co-immunoprecipitation, nuclear fractionation, immunofluorescence\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and functional rescue experiments in FA-deficient cells, replicated across two independent papers (PMID 12093742, 12239156)\",\n      \"pmids\": [\"12093742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FANCE promotes nuclear accumulation of FANCC and is itself a nuclear protein that co-immunoprecipitates with FANCA, FANCC, and FANCG (but not FANCD2) in normal cells. FANCE is required for monoubiquitination of FANCD2 and downstream events in the FA pathway.\",\n      \"method\": \"Retroviral transduction of FA-E cells, co-immunoprecipitation, HA-tagging and immunofluorescence localization, functional complementation (MMC resistance)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, localization, functional rescue), independently consistent with PMID 12093742\",\n      \"pmids\": [\"12239156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FANCE mediates a ternary complex with FANCC and FANCD2. Using yeast three-hybrid and two-hybrid systems confirmed in human cells, FANCE bridges FANCC and FANCD2. FANCE mutants that interact with FANCC but not FANCD2 abolish FANCD2 monoubiquitination and sensitize cells to DNA cross-linkers. FANCE also mediates interaction between FANCC and FANCF within the core complex.\",\n      \"method\": \"Yeast two-hybrid, yeast three-hybrid, co-immunoprecipitation in human cells, random mutagenesis screen, functional complementation assay (MMC sensitivity, FANCD2 monoubiquitination)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (two-hybrid, three-hybrid, human cell Co-IP, mutagenesis, functional readout) in a single rigorous study\",\n      \"pmids\": [\"16127171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In response to DNA damage, Chk1 directly phosphorylates FANCE at two conserved sites: threonine 346 and serine 374. Phosphorylated FANCE assembles into nuclear foci and co-localizes with FANCD2. A non-phosphorylatable FANCE mutant (T346A/S374A) permits FANCD2 monoubiquitination and foci formation but fails to complement MMC hypersensitivity, indicating a FANCD2 monoubiquitination-independent function of Chk1-mediated FANCE phosphorylation in DNA cross-link repair.\",\n      \"method\": \"In vitro kinase assay with recombinant Chk1 and FANCE, site-directed mutagenesis, retroviral transduction of FANCE-deficient cells, immunofluorescence, MMC sensitivity assay, S-phase progression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with mutagenesis plus functional cellular complementation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17296736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of human FANCE reveals a repeated helical motif (HEAT-like repeats). The crystallographically defined portion of FANCE is sufficient for interaction with FANCD2. Disease-associated mutations in FANCE disrupt the FANCE-FANCD2 interaction, providing structural insight into FA pathogenesis.\",\n      \"method\": \"X-ray crystallography, structure-guided mutagenesis, binding assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional validation of disease mutations and FANCD2 interaction, single lab but rigorous methods\",\n      \"pmids\": [\"17308347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Nuclear accumulation of FANCE depends on FANCC but not on other FA proteins (FANCA, FANCG, FANCF). Adding a nuclear export signal does not prevent FANCE nuclear localization, indicating the NLS motifs alone are not sufficient. The region of FANCE that binds FANCC is distinct from the region that binds FANCD2, supporting a model in which FANCE recruits FANCD2 to the core complex independently of FANCC binding.\",\n      \"method\": \"Retroviral transduction of FA-deficient cell lines, nuclear/cytoplasmic fractionation, immunofluorescence, nuclear export signal (NES) fusion constructs\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple FA-deficient cell line experiments with fractionation and NES constructs, single lab\",\n      \"pmids\": [\"16513431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The extreme C-terminus of FANCE (phenylalanine 522) is a critical residue for mediating monoubiquitination of the FANCD2-FANCI complex. An interaction-deficient FANCE mutant (disrupting FANCE-FANCD2 binding at the C-terminus) confers cellular sensitivity to cisplatin comparable to FANCE-null cells. Ectopic expression of the FANCE C-terminus fragment alone in normal cells disrupts DNA repair, confirming the FANCE-FANCD2 interaction is required for DNA cross-link repair.\",\n      \"method\": \"Site-directed mutagenesis, retroviral expression in FANCE-deficient cells, ubiquitination assay (FANCD2-FANCI monoubiquitination), cisplatin sensitivity assay, domain expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis with functional readouts (ubiquitination, DNA repair, drug sensitivity), multiple orthogonal methods, single lab\",\n      \"pmids\": [\"24451376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The FANCE gene was mapped to chromosome 6p21-22 using homozygosity mapping and genetic linkage analysis in FA complementation group E families.\",\n      \"method\": \"Homozygosity mapping, genetic linkage analysis, cell fusion complementation analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic mapping with complementation analysis, foundational localization study, single study\",\n      \"pmids\": [\"10205272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A splice isoform of FANCE (FANCEΔ4, lacking exon 4) is expressed in normal and breast cancer cell lines. FANCEΔ4 is translated into a nuclear protein but cannot support FANCD2 or FANCI monoubiquitination, fails to rescue MMC-induced G2/M block or cell survival in FANCE-deficient cells, and promotes degradation of FANCD2 protein. FANCEΔ4 interacts with wild-type FANCE and may act as a dominant negative regulator of FANCE activity.\",\n      \"method\": \"Retroviral transduction of EUFA130 (FANCE-deficient) cells, cell viability assays, flow cytometry (cell cycle), immunoblot (FANCD2/FANCI monoubiquitination), co-immunoprecipitation, immunofluorescence\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays in FA-deficient cells with Co-IP, single lab\",\n      \"pmids\": [\"26277624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The FANCC-FANCE-FANCF subcomplex is evolutionarily conserved from vertebrates to plants (Arabidopsis). In Arabidopsis meiosis, FANCC, FANCE, and FANCF form a physical complex and act together as anti-crossover factors. Loss of any one of the three genes partially rescues CO-defective mutants and causes synthetic meiotic catastrophe with the pro-CO factor MUS81.\",\n      \"method\": \"Genetic screen, yeast two-hybrid interaction, plant genetics (double/triple mutants), crossover frequency analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with physical interaction data in an ortholog system (plant), single lab\",\n      \"pmids\": [\"36652992\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FANCE is a nuclear scaffold subunit of the FA core E3 ubiquitin ligase complex that directly binds FANCC (via its central region) and FANCD2 (via its C-terminal phenylalanine 522), bridging the core complex to its substrate FANCD2 for monoubiquitination; it adopts a HEAT-repeat helical structure, requires FANCC for its own nuclear accumulation, is phosphorylated by Chk1 at T346/S374 in response to DNA damage to perform a FANCD2-monoubiquitination-independent repair function, and together with FANCC and FANCF forms an evolutionarily conserved subcomplex that also suppresses meiotic crossovers.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FANCE is a nuclear subunit of the Fanconi anemia (FA) core complex that functions as a molecular bridge coupling the core complex to its downstream substrate, the FANCD2-FANCI heterodimer [#0, #2]. It binds FANCC directly and, through a distinct region, contacts FANCD2, thereby recruiting the substrate for monoubiquitination; FANCE is required for nuclear accumulation of FANCC, formation of the FANCA-FANCC complex, FANCD2 monoubiquitination, and FANCD2 nuclear foci assembly [#0, #1, #5]. The FANCC-binding and FANCD2-binding surfaces are separable, and the extreme C-terminal residue phenylalanine 522 is the critical determinant of the FANCD2/FANCI interaction required for substrate monoubiquitination and DNA cross-link repair [#5, #6]. Structurally FANCE adopts a repeated helical (HEAT-like) fold, and disease-associated mutations map to this domain and disrupt the FANCE-FANCD2 interaction [#4]. Beyond its scaffolding role, FANCE is directly phosphorylated by Chk1 at threonine 346 and serine 374 upon DNA damage, an event dispensable for FANCD2 monoubiquitination but required for cross-link repair, defining a separable monoubiquitination-independent function [#3]. The FANCC-FANCE-FANCF subcomplex is evolutionarily conserved and additionally acts to suppress meiotic crossovers [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Before FANCE's molecular role was known, its gene had to be localized; mapping the FA complementation group E locus established the genetic foundation for cloning and functional study.\",\n      \"evidence\": \"Homozygosity mapping and linkage analysis in FA-E families with cell fusion complementation\",\n      \"pmids\": [\"10205272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not identify the gene product or its biochemical function\", \"No mechanistic role established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"It was unknown how FANCE fit into the FA pathway; demonstrating that FANCE binds FANCC and FANCD2 and is required for FANCC nuclear accumulation and FANCD2 monoubiquitination placed FANCE as an essential core complex component linking core assembly to substrate activation.\",\n      \"evidence\": \"Co-IP, nuclear fractionation, immunofluorescence, and functional rescue (MMC resistance) in FA-E cells; two independent papers\",\n      \"pmids\": [\"12093742\", \"12239156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define which FANCE regions mediate each interaction\", \"Mechanism of how FANCE drives FANCD2 monoubiquitination not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Whether FANCE acts as a passive subunit or an active bridge was unclear; showing FANCE forms a ternary complex bridging FANCC and FANCD2, with separation-of-function mutants that bind FANCC but not FANCD2 abolishing monoubiquitination, established FANCE as the adaptor recruiting the substrate to the core complex.\",\n      \"evidence\": \"Yeast two- and three-hybrid, human cell Co-IP, random mutagenesis, and functional complementation\",\n      \"pmids\": [\"16127171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not map the residues responsible for FANCD2 binding\", \"No structural basis for the bridging interaction\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The basis of FANCE nuclear localization was uncertain; demonstrating that nuclear accumulation depends specifically on FANCC and that FANCC- and FANCD2-binding regions are distinct refined the recruitment model.\",\n      \"evidence\": \"Fractionation, immunofluorescence, and NES fusion constructs in FA-deficient cell lines\",\n      \"pmids\": [\"16513431\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Precise NLS-independent import mechanism not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"The structural architecture and the question of whether FANCE has regulated functions beyond scaffolding were open; the crystal structure revealed a HEAT-like helical fold sufficient for FANCD2 binding, while Chk1 phosphorylation at T346/S374 defined a monoubiquitination-independent repair role.\",\n      \"evidence\": \"X-ray crystallography with structure-guided mutagenesis; in vitro Chk1 kinase assay, phospho-site mutagenesis, and MMC complementation\",\n      \"pmids\": [\"17308347\", \"17296736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The downstream effector of Chk1-phosphorylated FANCE in cross-link repair is unidentified\", \"Full-length structure in complex with partners not solved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The exact determinant of the FANCE-FANCD2 interaction was unresolved; identifying C-terminal phenylalanine 522 as critical for FANCD2-FANCI monoubiquitination and cross-link repair pinpointed the substrate-engagement residue.\",\n      \"evidence\": \"Site-directed mutagenesis, monoubiquitination and cisplatin sensitivity assays, and dominant disruption by C-terminal fragment expression\",\n      \"pmids\": [\"24451376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of the F522-FANCD2 contact not resolved\", \"How this residue couples to the catalytic FANCL ligase is unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Whether FANCE activity is endogenously regulated by isoforms was unknown; characterization of the FANCEΔ4 splice variant as a nuclear, monoubiquitination-incompetent dominant-negative that promotes FANCD2 degradation revealed an alternative-splicing layer of FANCE control.\",\n      \"evidence\": \"Retroviral expression in FANCE-deficient cells, cell cycle and viability assays, monoubiquitination immunoblot, and Co-IP\",\n      \"pmids\": [\"26277624\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Physiological regulation and prevalence of FANCEΔ4 not established\", \"Mechanism of FANCD2 degradation not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Whether the FANCC-FANCE-FANCF module has functions beyond the canonical core complex was open; showing this subcomplex is conserved to plants and acts as an anti-crossover factor in meiosis extended FANCE's role to recombination regulation.\",\n      \"evidence\": \"Genetic screen, yeast two-hybrid, and meiotic crossover analysis in Arabidopsis mutants\",\n      \"pmids\": [\"36652992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Demonstrated in an ortholog system, not human cells\", \"Molecular mechanism of crossover suppression unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The downstream effector and molecular mechanism by which Chk1-phosphorylated FANCE promotes cross-link repair independently of FANCD2 monoubiquitination remain unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No effector identified for the monoubiquitination-independent FANCE function\", \"No structure of full-length FANCE within the assembled core complex\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 5, 6]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 3, 6]}\n    ],\n    \"complexes\": [\"FA core complex\", \"FANCC-FANCE-FANCF subcomplex\"],\n    \"partners\": [\"FANCC\", \"FANCD2\", \"FANCA\", \"FANCG\", \"FANCF\", \"FANCI\", \"CHEK1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}