{"gene":"FBL","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1991,"finding":"Yeast NOP1 (fibrillarin ortholog) is required for pre-rRNA processing: conditional depletion of NOP1 progressively impairs all pre-rRNA processing steps (particularly the pathway leading to 18S rRNA) and concomitantly impairs pre-rRNA methylation, causing accumulation of unmethylated, unprocessed pre-rRNA. NOP1 depletion blocks cytoplasmic ribosome production without preventing nucleolar localization of snoRNAs.","method":"Conditional depletion via GAL promoter replacement, pulse-chase labeling of pre-rRNA, Northern hybridization, subnuclear fractionation, immunocytochemistry","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with multiple orthogonal readouts (pulse-chase, Northern, methylation assay, fractionation), foundational study replicated across labs","pmids":["1825809"],"is_preprint":false},{"year":1990,"finding":"Yeast NOP1/p38 encodes a nucleolar protein with an N-terminal glycine-arginine-rich (GAR) repetitive motif homologous to mammalian fibrillarin and nucleolin; the protein contains a putative nuclear localization signal and is the product of a single-copy gene.","method":"Gene isolation, DNA sequencing, Northern blot, protein sequence alignment, immunoreactivity with scleroderma patient serum","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — sequence characterization plus cross-reactivity with human fibrillarin antibody; single lab but multiple methods","pmids":["2298745"],"is_preprint":false},{"year":2015,"finding":"In C. elegans, fibrillarin (FIB-1) abundance is translationally repressed by NCL-1 (in cooperation with PUF and NOS RNA-binding proteins), and NCL-1 is itself inhibited by the microRNA let-7. This let-7–ncl-1–fib-1 genetic cascade controls nucleolar size and rRNA pool: loss-of-function of fib-1 reduces nucleolar size, while its overexpression increases nucleolar size correlated with rRNA levels.","method":"Loss-of-function genetic epistasis analysis, translation reporter assays, 3′UTR binding assays, nucleolar size measurement","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple loss-of-function alleles and orthogonal reporters establishing pathway position and mechanism","pmids":["26492166"],"is_preprint":false},{"year":2020,"finding":"The N-terminal glycine-arginine-rich (GAR) domain of fibrillarin (FBL) functions as both a nuclear localization signal (NLS) and a nucleolar localization signal (NoLS). Arginine methylation within the GAR domain is required for nuclear import but decreases efficiency of nucleolar retention. Deletion or mutation of the GAR domain mislocalizes FBL.","method":"Deletion and point mutant constructs of FBL expressed in eukaryotic cells, subcellular fractionation, live-cell fluorescence microscopy, arginine methylation inhibition","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with mutagenesis in single lab, two orthogonal methods (fractionation + live imaging)","pmids":["32377452"],"is_preprint":false},{"year":2023,"finding":"FBL (fibrillarin) promotes DNA damage response and resistance to DNA crosslinking agents in cancer cells. FBL physically interacts with Y-box-binding protein 1 (YBX1) and increases nuclear accumulation of YBX1 upon DNA damage. FBL promotes BRCA1 transcription by enhancing YBX1 binding to the BRCA1 promoter. FBL knockdown sensitizes tumor cells to DNA crosslinking agents and causes homologous recombination repair defects.","method":"Co-immunoprecipitation (Co-IP) of FBL–YBX1 interaction, FBL knockdown in cell lines and xenografts, ChIP assay for YBX1 at BRCA1 promoter, comet assay and HR repair assays","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus KD phenotype in single lab with multiple orthogonal methods","pmids":["37489617"],"is_preprint":false},{"year":2024,"finding":"FBL (fibrillarin) drives AML cell survival primarily through its phase separation (PS) domains rather than its methyltransferase or acetylation domains. Phase separation-competent FBL promotes nucleolar condensate formation, early pre-rRNA processing steps (efflux, cleavage, and methylation), and ultimately enhances translation of oncogenes including MYC. Targeting FBL phase separation with CGX-635 eliminates AML cells.","method":"In vivo CRISPR RBP screen, domain-specific mutant rescue experiments, phase separation assays, pre-rRNA processing assays, polysome profiling/translation assays, pharmacological inhibition with CGX-635","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (CRISPR screen, domain mutagenesis, in vitro PS assays, rRNA processing, translation, pharmacological) in rigorous study","pmids":["38745030"],"is_preprint":false}],"current_model":"Fibrillarin (FBL/NOP1) is an essential nucleolar methyltransferase whose GAR domain (arginine-methylation-dependent) directs nuclear import and nucleolar retention; it is required for 2′-O-methylation and all steps of pre-rRNA processing leading to mature rRNA; its abundance is controlled post-transcriptionally by a let-7–NCL-1 cascade; its phase separation-competent domains drive nucleolar condensate assembly and early pre-rRNA processing to enhance oncogene translation in AML; and outside the nucleolus it promotes DNA damage resistance by interacting with YBX1 to drive BRCA1 transcription."},"narrative":{"mechanistic_narrative":"Fibrillarin (FBL/NOP1) is an essential nucleolar protein required for the methylation and processing of pre-rRNA en route to mature ribosomes, a function conserved from yeast to mammals [PMID:1825809]. Conditional depletion of the yeast ortholog progressively blocks all pre-rRNA processing steps, impairs pre-rRNA methylation, and arrests cytoplasmic ribosome production while leaving snoRNA nucleolar localization intact [PMID:1825809]. FBL is targeted to its site of action by its N-terminal glycine-arginine-rich (GAR) domain, which acts as both a nuclear and nucleolar localization signal; arginine methylation within this domain drives nuclear import while reducing nucleolar retention efficiency [PMID:32377452]. Beyond directing localization, FBL's phase separation-competent domains nucleate nucleolar condensate assembly and early pre-rRNA processing (efflux, cleavage, and methylation), and in acute myeloid leukemia this activity—rather than its methyltransferase function—enhances oncogene translation, including MYC, to sustain cell survival [PMID:38745030]. FBL abundance is set post-transcriptionally: in C. elegans a let-7–NCL-1 cascade translationally represses fibrillarin to control nucleolar size in proportion to the rRNA pool [PMID:26492166]. FBL also acts outside ribosome biogenesis to promote DNA damage resistance, physically interacting with YBX1 and enhancing its binding at the BRCA1 promoter to drive BRCA1 transcription and homologous recombination repair [PMID:37489617].","teleology":[{"year":1990,"claim":"Establishing that the yeast NOP1 gene encodes a single-copy nucleolar protein structurally homologous to mammalian fibrillarin defined the molecular identity and conserved GAR-domain architecture of the protein.","evidence":"Gene isolation, DNA sequencing, and protein alignment with cross-reactivity to scleroderma serum in yeast","pmids":["2298745"],"confidence":"Medium","gaps":["Sequence homology alone did not establish the GAR domain's functional role","No enzymatic or processing function demonstrated at this stage"]},{"year":1991,"claim":"Conditional depletion answered what NOP1/fibrillarin does mechanistically, showing it is required for both pre-rRNA methylation and all pre-rRNA processing steps that yield mature rRNA.","evidence":"GAL-promoter conditional depletion with pulse-chase labeling, Northern hybridization, methylation assay, and subnuclear fractionation in yeast","pmids":["1825809"],"confidence":"High","gaps":["Did not resolve whether methylation defect causes the processing defect or vice versa","Catalytic mechanism of methylation not defined","Findings in yeast, not directly in human cells"]},{"year":2015,"claim":"Genetic epistasis in C. elegans established how fibrillarin abundance is regulated, placing it downstream of a let-7–NCL-1 translational repression cascade that couples FBL levels to nucleolar size and rRNA pool.","evidence":"Loss-of-function epistasis, translation and 3'UTR reporter assays, and nucleolar size measurement in C. elegans","pmids":["26492166"],"confidence":"High","gaps":["Conservation of the let-7–NCL-1–FBL cascade in mammals not demonstrated","Does not address direct molecular function of fibrillarin protein"]},{"year":2020,"claim":"Dissecting the GAR domain answered how FBL reaches the nucleolus, showing it serves as a dual nuclear/nucleolar localization signal whose arginine methylation favors import but disfavors retention.","evidence":"Deletion and point mutants, subcellular fractionation, live-cell imaging, and arginine-methylation inhibition in eukaryotic cells","pmids":["32377452"],"confidence":"Medium","gaps":["Single lab; import machinery recognizing the GAR-NLS not identified","Quantitative balance between import and retention not fully resolved"]},{"year":2023,"claim":"A non-canonical role was uncovered: FBL acts in the DNA damage response by interacting with YBX1 to drive BRCA1 transcription and homologous recombination, linking it to crosslinker resistance in cancer.","evidence":"Co-IP, FBL knockdown in cells and xenografts, ChIP at the BRCA1 promoter, comet and HR repair assays","pmids":["37489617"],"confidence":"Medium","gaps":["Single-lab Co-IP without reciprocal structural mapping of the FBL–YBX1 interface","Mechanism by which FBL increases nuclear YBX1 accumulation unclear","Whether this function depends on nucleolar localization or methyltransferase activity not resolved"]},{"year":2024,"claim":"Domain-specific functional dissection showed that FBL's phase separation domains, not its catalytic domains, drive nucleolar condensate formation and oncogene translation, identifying a druggable vulnerability in AML.","evidence":"In vivo CRISPR RBP screen, domain-mutant rescue, phase separation and pre-rRNA processing assays, polysome profiling, and pharmacological inhibition with CGX-635","pmids":["38745030"],"confidence":"High","gaps":["Relationship between phase separation and the conserved methyltransferase/processing role not fully reconciled","Selectivity and on-target mechanism of CGX-635 in normal cells not defined"]},{"year":null,"claim":"How FBL's distinct activities—2'-O-methylation, condensate-driven processing, localization control, and the YBX1/BRCA1 transcriptional role—are integrated and regulated within a single protein remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating GAR localization, catalytic, and phase-separation functions","Whether the DNA-damage role requires catalytic or condensate activity is unknown","Mammalian regulation of FBL abundance not directly characterized in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0,1,3,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,5]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4]}],"complexes":[],"partners":["YBX1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P22087","full_name":"rRNA 2'-O-methyltransferase fibrillarin","aliases":["34 kDa nucleolar scleroderma antigen","Histone-glutamine methyltransferase","U6 snRNA 2'-O-methyltransferase fibrillarin"],"length_aa":321,"mass_kda":33.8,"function":"S-adenosyl-L-methionine-dependent methyltransferase that has the ability to methylate both RNAs and proteins (PubMed:24352239, PubMed:30540930, PubMed:32017898). Involved in pre-rRNA processing by catalyzing the site-specific 2'-hydroxyl methylation of ribose moieties in pre-ribosomal RNA (PubMed:30540930). Site specificity is provided by a guide RNA that base pairs with the substrate (By similarity). Methylation occurs at a characteristic distance from the sequence involved in base pairing with the guide RNA (By similarity). Probably catalyzes 2'-O-methylation of U6 snRNAs in box C/D RNP complexes (PubMed:32017898). U6 snRNA 2'-O-methylation is required for mRNA splicing fidelity (PubMed:32017898). Also acts as a protein methyltransferase by mediating methylation of 'Gln-105' of histone H2A (H2AQ104me), a modification that impairs binding of the FACT complex and is specifically present at 35S ribosomal DNA locus (PubMed:24352239, PubMed:30540930). Part of the small subunit (SSU) processome, first precursor of the small eukaryotic ribosomal subunit. During the assembly of the SSU processome in the nucleolus, many ribosome biogenesis factors, an RNA chaperone and ribosomal proteins associate with the nascent pre-rRNA and work in concert to generate RNA folding, modifications, rearrangements and cleavage as well as targeted degradation of pre-ribosomal RNA by the RNA exosome (PubMed:34516797)","subcellular_location":"Nucleus, nucleolus; Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/P22087/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/FBL","classification":"Common Essential","n_dependent_lines":1190,"n_total_lines":1208,"dependency_fraction":0.9850993377483444},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000105202","cell_line_id":"CID000857","localizations":[{"compartment":"nucleolus_fc_dfc","grade":3}],"interactors":[{"gene":"NOP58","stoichiometry":10.0},{"gene":"ANXA5","stoichiometry":10.0},{"gene":"NOP56","stoichiometry":4.0},{"gene":"S100A10","stoichiometry":0.2},{"gene":"ATP6V0A2","stoichiometry":0.2},{"gene":"NOL7","stoichiometry":0.2},{"gene":"CACTIN","stoichiometry":0.2},{"gene":"TGS1","stoichiometry":0.2},{"gene":"KIAA1598","stoichiometry":0.2},{"gene":"NHP2L1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000857","total_profiled":1310},"omim":[{"mim_id":"621385","title":"NUCLEOLAR PROTEIN 12; NOL12","url":"https://www.omim.org/entry/621385"},{"mim_id":"621089","title":"SMALL NUCLEOLAR RNA, H/ACA BOX, 74A; SNORA74A","url":"https://www.omim.org/entry/621089"},{"mim_id":"619357","title":"ADENYLATE KINASE 6; AK6","url":"https://www.omim.org/entry/619357"},{"mim_id":"616936","title":"CHROMODOMAIN HELICASE DNA-BINDING PROTEIN 9; CHD9","url":"https://www.omim.org/entry/616936"},{"mim_id":"616742","title":"NOP58 RIBONUCLEOPROTEIN; NOP58","url":"https://www.omim.org/entry/616742"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli fibrillar center","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FBL"},"hgnc":{"alias_symbol":["RNU3IP1","FLRN","FIB","Nop1"],"prev_symbol":[]},"alphafold":{"accession":"P22087","domains":[{"cath_id":"3.30.200.20","chopping":"86-135","consensus_level":"medium","plddt":85.9344,"start":86,"end":135},{"cath_id":"3.40.50.150","chopping":"142-312","consensus_level":"high","plddt":92.3992,"start":142,"end":312}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P22087","model_url":"https://alphafold.ebi.ac.uk/files/AF-P22087-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P22087-F1-predicted_aligned_error_v6.png","plddt_mean":76.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FBL","jax_strain_url":"https://www.jax.org/strain/search?query=FBL"},"sequence":{"accession":"P22087","fasta_url":"https://rest.uniprot.org/uniprotkb/P22087.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P22087/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P22087"}},"corpus_meta":[{"pmid":"1825809","id":"PMC_1825809","title":"The small nucleolar RNP protein NOP1 (fibrillarin) is required for pre-rRNA processing in yeast.","date":"1991","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/1825809","citation_count":318,"is_preprint":false},{"pmid":"28500755","id":"PMC_28500755","title":"Enhanced FIB-SEM systems for large-volume 3D imaging.","date":"2017","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/28500755","citation_count":286,"is_preprint":false},{"pmid":"37088311","id":"PMC_37088311","title":"Using the ELF test, FIB-4 and NAFLD fibrosis score to screen the population for liver disease.","date":"2023","source":"Journal of hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/37088311","citation_count":189,"is_preprint":false},{"pmid":"31363205","id":"PMC_31363205","title":"A cryo-FIB lift-out technique enables molecular-resolution cryo-ET within native Caenorhabditis elegans tissue.","date":"2019","source":"Nature methods","url":"https://pubmed.ncbi.nlm.nih.gov/31363205","citation_count":178,"is_preprint":false},{"pmid":"10571987","id":"PMC_10571987","title":"A eukaryotic protein, NOP-1, binds retinal to form an archaeal rhodopsin-like photochemically reactive pigment.","date":"1999","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10571987","citation_count":123,"is_preprint":false},{"pmid":"2298745","id":"PMC_2298745","title":"Isolation and sequencing of NOP1. 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processing: conditional depletion of NOP1 progressively impairs all pre-rRNA processing steps (particularly the pathway leading to 18S rRNA) and concomitantly impairs pre-rRNA methylation, causing accumulation of unmethylated, unprocessed pre-rRNA. NOP1 depletion blocks cytoplasmic ribosome production without preventing nucleolar localization of snoRNAs.\",\n      \"method\": \"Conditional depletion via GAL promoter replacement, pulse-chase labeling of pre-rRNA, Northern hybridization, subnuclear fractionation, immunocytochemistry\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with multiple orthogonal readouts (pulse-chase, Northern, methylation assay, fractionation), foundational study replicated across labs\",\n      \"pmids\": [\"1825809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Yeast NOP1/p38 encodes a nucleolar protein with an N-terminal glycine-arginine-rich (GAR) repetitive motif homologous to mammalian fibrillarin and nucleolin; the protein contains a putative nuclear localization signal and is the product of a single-copy gene.\",\n      \"method\": \"Gene isolation, DNA sequencing, Northern blot, protein sequence alignment, immunoreactivity with scleroderma patient serum\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — sequence characterization plus cross-reactivity with human fibrillarin antibody; single lab but multiple methods\",\n      \"pmids\": [\"2298745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In C. elegans, fibrillarin (FIB-1) abundance is translationally repressed by NCL-1 (in cooperation with PUF and NOS RNA-binding proteins), and NCL-1 is itself inhibited by the microRNA let-7. This let-7–ncl-1–fib-1 genetic cascade controls nucleolar size and rRNA pool: loss-of-function of fib-1 reduces nucleolar size, while its overexpression increases nucleolar size correlated with rRNA levels.\",\n      \"method\": \"Loss-of-function genetic epistasis analysis, translation reporter assays, 3′UTR binding assays, nucleolar size measurement\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple loss-of-function alleles and orthogonal reporters establishing pathway position and mechanism\",\n      \"pmids\": [\"26492166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The N-terminal glycine-arginine-rich (GAR) domain of fibrillarin (FBL) functions as both a nuclear localization signal (NLS) and a nucleolar localization signal (NoLS). Arginine methylation within the GAR domain is required for nuclear import but decreases efficiency of nucleolar retention. Deletion or mutation of the GAR domain mislocalizes FBL.\",\n      \"method\": \"Deletion and point mutant constructs of FBL expressed in eukaryotic cells, subcellular fractionation, live-cell fluorescence microscopy, arginine methylation inhibition\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with mutagenesis in single lab, two orthogonal methods (fractionation + live imaging)\",\n      \"pmids\": [\"32377452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FBL (fibrillarin) promotes DNA damage response and resistance to DNA crosslinking agents in cancer cells. FBL physically interacts with Y-box-binding protein 1 (YBX1) and increases nuclear accumulation of YBX1 upon DNA damage. FBL promotes BRCA1 transcription by enhancing YBX1 binding to the BRCA1 promoter. FBL knockdown sensitizes tumor cells to DNA crosslinking agents and causes homologous recombination repair defects.\",\n      \"method\": \"Co-immunoprecipitation (Co-IP) of FBL–YBX1 interaction, FBL knockdown in cell lines and xenografts, ChIP assay for YBX1 at BRCA1 promoter, comet assay and HR repair assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus KD phenotype in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37489617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FBL (fibrillarin) drives AML cell survival primarily through its phase separation (PS) domains rather than its methyltransferase or acetylation domains. Phase separation-competent FBL promotes nucleolar condensate formation, early pre-rRNA processing steps (efflux, cleavage, and methylation), and ultimately enhances translation of oncogenes including MYC. Targeting FBL phase separation with CGX-635 eliminates AML cells.\",\n      \"method\": \"In vivo CRISPR RBP screen, domain-specific mutant rescue experiments, phase separation assays, pre-rRNA processing assays, polysome profiling/translation assays, pharmacological inhibition with CGX-635\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (CRISPR screen, domain mutagenesis, in vitro PS assays, rRNA processing, translation, pharmacological) in rigorous study\",\n      \"pmids\": [\"38745030\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Fibrillarin (FBL/NOP1) is an essential nucleolar methyltransferase whose GAR domain (arginine-methylation-dependent) directs nuclear import and nucleolar retention; it is required for 2′-O-methylation and all steps of pre-rRNA processing leading to mature rRNA; its abundance is controlled post-transcriptionally by a let-7–NCL-1 cascade; its phase separation-competent domains drive nucleolar condensate assembly and early pre-rRNA processing to enhance oncogene translation in AML; and outside the nucleolus it promotes DNA damage resistance by interacting with YBX1 to drive BRCA1 transcription.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Fibrillarin (FBL/NOP1) is an essential nucleolar protein required for the methylation and processing of pre-rRNA en route to mature ribosomes, a function conserved from yeast to mammals [#0]. Conditional depletion of the yeast ortholog progressively blocks all pre-rRNA processing steps, impairs pre-rRNA methylation, and arrests cytoplasmic ribosome production while leaving snoRNA nucleolar localization intact [#0]. FBL is targeted to its site of action by its N-terminal glycine-arginine-rich (GAR) domain, which acts as both a nuclear and nucleolar localization signal; arginine methylation within this domain drives nuclear import while reducing nucleolar retention efficiency [#3]. Beyond directing localization, FBL's phase separation-competent domains nucleate nucleolar condensate assembly and early pre-rRNA processing (efflux, cleavage, and methylation), and in acute myeloid leukemia this activity—rather than its methyltransferase function—enhances oncogene translation, including MYC, to sustain cell survival [#5]. FBL abundance is set post-transcriptionally: in C. elegans a let-7\\u2013NCL-1 cascade translationally represses fibrillarin to control nucleolar size in proportion to the rRNA pool [#2]. FBL also acts outside ribosome biogenesis to promote DNA damage resistance, physically interacting with YBX1 and enhancing its binding at the BRCA1 promoter to drive BRCA1 transcription and homologous recombination repair [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that the yeast NOP1 gene encodes a single-copy nucleolar protein structurally homologous to mammalian fibrillarin defined the molecular identity and conserved GAR-domain architecture of the protein.\",\n      \"evidence\": \"Gene isolation, DNA sequencing, and protein alignment with cross-reactivity to scleroderma serum in yeast\",\n      \"pmids\": [\"2298745\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Sequence homology alone did not establish the GAR domain's functional role\",\n        \"No enzymatic or processing function demonstrated at this stage\"\n      ]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Conditional depletion answered what NOP1/fibrillarin does mechanistically, showing it is required for both pre-rRNA methylation and all pre-rRNA processing steps that yield mature rRNA.\",\n      \"evidence\": \"GAL-promoter conditional depletion with pulse-chase labeling, Northern hybridization, methylation assay, and subnuclear fractionation in yeast\",\n      \"pmids\": [\"1825809\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Did not resolve whether methylation defect causes the processing defect or vice versa\",\n        \"Catalytic mechanism of methylation not defined\",\n        \"Findings in yeast, not directly in human cells\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Genetic epistasis in C. elegans established how fibrillarin abundance is regulated, placing it downstream of a let-7\\u2013NCL-1 translational repression cascade that couples FBL levels to nucleolar size and rRNA pool.\",\n      \"evidence\": \"Loss-of-function epistasis, translation and 3'UTR reporter assays, and nucleolar size measurement in C. elegans\",\n      \"pmids\": [\"26492166\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Conservation of the let-7\\u2013NCL-1\\u2013FBL cascade in mammals not demonstrated\",\n        \"Does not address direct molecular function of fibrillarin protein\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissecting the GAR domain answered how FBL reaches the nucleolus, showing it serves as a dual nuclear/nucleolar localization signal whose arginine methylation favors import but disfavors retention.\",\n      \"evidence\": \"Deletion and point mutants, subcellular fractionation, live-cell imaging, and arginine-methylation inhibition in eukaryotic cells\",\n      \"pmids\": [\"32377452\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Single lab; import machinery recognizing the GAR-NLS not identified\",\n        \"Quantitative balance between import and retention not fully resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A non-canonical role was uncovered: FBL acts in the DNA damage response by interacting with YBX1 to drive BRCA1 transcription and homologous recombination, linking it to crosslinker resistance in cancer.\",\n      \"evidence\": \"Co-IP, FBL knockdown in cells and xenografts, ChIP at the BRCA1 promoter, comet and HR repair assays\",\n      \"pmids\": [\"37489617\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Single-lab Co-IP without reciprocal structural mapping of the FBL\\u2013YBX1 interface\",\n        \"Mechanism by which FBL increases nuclear YBX1 accumulation unclear\",\n        \"Whether this function depends on nucleolar localization or methyltransferase activity not resolved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Domain-specific functional dissection showed that FBL's phase separation domains, not its catalytic domains, drive nucleolar condensate formation and oncogene translation, identifying a druggable vulnerability in AML.\",\n      \"evidence\": \"In vivo CRISPR RBP screen, domain-mutant rescue, phase separation and pre-rRNA processing assays, polysome profiling, and pharmacological inhibition with CGX-635\",\n      \"pmids\": [\"38745030\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Relationship between phase separation and the conserved methyltransferase/processing role not fully reconciled\",\n        \"Selectivity and on-target mechanism of CGX-635 in normal cells not defined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FBL's distinct activities—2'-O-methylation, condensate-driven processing, localization control, and the YBX1/BRCA1 transcriptional role—are integrated and regulated within a single protein remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"No structural model integrating GAR localization, catalytic, and phase-separation functions\",\n        \"Whether the DNA-damage role requires catalytic or condensate activity is unknown\",\n        \"Mammalian regulation of FBL abundance not directly characterized in the corpus\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0, 1, 3, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"YBX1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}