{"gene":"TCOF1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1997,"finding":"TCOF1 encodes a low-complexity nucleolar phosphoprotein (treacle) of 1,411 amino acids with repeated motifs shared with nucleolar trafficking proteins, predicted to be highly phosphorylated by casein kinase, and containing putative nuclear and nucleolar localization signals.","method":"Genomic sequencing, bioinformatic analysis of protein structure","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — primary sequence and domain analysis replicated in multiple independent studies characterizing the gene","pmids":["9096354"],"is_preprint":false},{"year":1998,"finding":"Treacle localizes to the nucleolus, with the last 41 residues of the C-terminus (residues 1262-1302) sufficient for nucleolar localization; at least two functional nuclear localization signals exist in the C-terminal region.","method":"GFP fusion constructs with full-length and deleted domains of murine treacle expressed in cells; live fluorescence microscopy","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment with deletion mapping, confirmed with both murine and human constructs, replicated by independent lab (PMID:10982400, PMID:9736782)","pmids":["9811939","9736782","10982400"],"is_preprint":false},{"year":1998,"finding":"TCS mutations that create premature termination codons produce truncated treacle proteins that are mislocalized within the cell (not nucleolar), supporting the hypothesis that nucleolar shuttling is integral to treacle function.","method":"Site-directed mutagenesis recreating TCS mutations; GFP-fusion protein localization assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with direct localization, functional consequence demonstrated","pmids":["9736782"],"is_preprint":false},{"year":1999,"finding":"Treacle fusion peptides can be phosphorylated by casein kinase II (CKII) and protein kinase C (PKC) in vitro; branchial arch tissue extracts contain a kinase activity consistent with CKII site recognition that phosphorylates treacle peptides, coinciding with peak treacle expression.","method":"In vitro kinase assays using GST-treacle fusion peptides with recombinant kinases and tissue extracts","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay with tissue extracts; single lab","pmids":["10545604"],"is_preprint":false},{"year":2000,"finding":"Treacle is a highly phosphorylated nucleolar protein; casein kinase 2 (CK2) is responsible for its high degree of phosphorylation, as evidenced by co-immunoprecipitation of CK2 with treacle.","method":"Immunofluorescence, co-immunoprecipitation, phosphorylation analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP establishes CK2 association; consistent with independent in vitro kinase data","pmids":["10982400"],"is_preprint":false},{"year":2003,"finding":"Treacle is a constituent of hNop56p-associated pre-ribosomal ribonucleoprotein complexes; the association of treacle with hNop56p is independent of rRNA integrity, indicating a direct protein-protein interaction.","method":"Affinity purification of Nop56p complexes, mass spectrometry, RNase treatment controls","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification with direct interaction supported by RNase-independence control; single lab","pmids":["12777385"],"is_preprint":false},{"year":2004,"finding":"Treacle interacts physically with upstream binding factor (UBF) and is involved in ribosomal DNA (rDNA) gene transcription; siRNA knockdown of treacle inhibits rDNA transcription and cell growth.","method":"Co-immunoprecipitation, yeast two-hybrid, immunofluorescence co-localization, siRNA knockdown with rDNA transcription assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus yeast two-hybrid plus functional knockdown, multiple orthogonal methods in one study","pmids":["15249688"],"is_preprint":false},{"year":2005,"finding":"Treacle participates in 2'-O-methylation of pre-rRNA; antisense knockdown of treacle in Xenopus oocytes reduces pre-rRNA methylation, and Tcof1+/- mouse embryos show significant reduction in 2'-O-methylation at specific rRNA residues. Treacle's role in methylation is mediated through direct physical interaction with NOP56, a component of the ribonucleoprotein methylation complex.","method":"Antisense knockdown in Xenopus oocytes, rRNA methylation analysis, co-immunoprecipitation of treacle with NOP56, immunofluorescence co-localization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional knockdown with direct biochemical readout in two model systems, plus Co-IP of interaction partner","pmids":["15930015"],"is_preprint":false},{"year":2006,"finding":"Tcof1/Treacle is required cell-autonomously for neural crest cell formation and proliferation; haploinsufficiency of Tcof1 leads to deficiency in migrating neural crest cells causing craniofacial malformations. Tcof1/Treacle regulates proliferation by controlling production of mature ribosomes.","method":"Germ-line Tcof1 mouse knockout, neural crest cell lineage tracing, ribosome biogenesis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean in vivo KO with defined cellular phenotype and mechanistic link to ribosome biogenesis","pmids":["16938878"],"is_preprint":false},{"year":2009,"finding":"The central repeated domain of treacle binds RNA polymerase I (Pol I), while the C-terminus is involved in rDNA promoter recognition and UBF recruitment. Treacle, but not UBF, is essential for nucleolar recruitment of the Pol I transcription complex; knockdown of treacle disperses Pol I and UBF from the nucleolus, but treacle-Pol I interactions and treacle-rDNA promoter interactions are not disrupted by UBF depletion.","method":"Co-immunoprecipitation, siRNA knockdown, chromatin immunoprecipitation (ChIP), domain-mapping experiments","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, ChIP, siRNA knockdown) in single lab establishing mechanistic hierarchy","pmids":["19527688"],"is_preprint":false},{"year":2012,"finding":"Treacle is a novel centrosome- and kinetochore-associated protein that controls spindle orientation and mitotic progression via a direct interaction with Polo-like kinase 1 (Plk1); Tcof1 loss-of-function disrupts spindle orientation and cell cycle progression, perturbing neural progenitor maintenance during cortical neurogenesis.","method":"Co-immunoprecipitation (Treacle-Plk1 interaction), Tcof1 loss-of-function mouse model, immunofluorescence for centrosome/kinetochore localization, spindle orientation analysis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct Co-IP establishing Plk1 interaction, clean KO mouse with defined cellular phenotype, direct localization experiment with functional consequence","pmids":["22479190"],"is_preprint":false},{"year":2014,"finding":"Treacle (TCOF1) interacts with NBS1 (Nijmegen breakage syndrome protein 1) and mediates NBS1 translocation into nucleoli in response to DNA damage, thereby triggering pan-nuclear silencing of rRNA transcription. NBS1 nucleolar accumulation is Treacle-dependent.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence relocalization assays after DNA damage induction","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, siRNA functional studies, and localization assays in two independent labs (PMID:25064736 and PMID:25512513)","pmids":["25064736","25512513"],"is_preprint":false},{"year":2014,"finding":"NBS1 relocalization to nucleoli after DNA damage requires TCOF1 and is dependent on casein kinase II and ATM-mediated phosphorylation of TCOF1; a putative ATM phosphorylation site in TCOF1 is required for NBS1 nucleolar relocalization. TCOF1 promotes cellular resistance to DNA-damaging agents.","method":"Co-immunoprecipitation, site-directed mutagenesis of ATM phosphorylation site, siRNA knockdown, cell survival assays after DNA damage","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of functional phosphorylation site plus Co-IP plus functional assays in single rigorous study","pmids":["25512513"],"is_preprint":false},{"year":2020,"finding":"Treacle recruits TOPBP1 into nucleoli in an ATM- and NBS1-dependent manner in response to rDNA double-strand breaks; this is mediated by phosphorylation-dependent interactions between three BRCT domains of TOPBP1 and conserved phosphorylated Ser/Thr residues at the C-terminus of Treacle. TOPBP1 recruitment is required for inhibition of rRNA synthesis and nucleolar segregation.","method":"Co-immunoprecipitation, phospho-peptide binding assays, siRNA knockdown, immunofluorescence, site-directed mutagenesis of phosphorylation sites","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — phospho-dependent interaction mapping with mutagenesis, multiple orthogonal methods, functional readouts","pmids":["31913317"],"is_preprint":false},{"year":2020,"finding":"During S phase, TCOF1 leaves the nucleolus and is recruited to telomeres by interacting with TRF2; at telomeres, TCOF1 suppresses telomere transcription by binding and inhibiting RNA Pol II, thereby limiting TERRA levels. Depletion of TCOF1 causes elevated TERRA, DNA/RNA R-loops, replication fork stalling, and fragile telomeres.","method":"Co-immunoprecipitation (TCOF1-TRF2), chromatin immunoprecipitation, siRNA knockdown, R-loop detection, RNase H1 rescue experiment, TERRA quantification","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP establishing TRF2 interaction, functional rescue experiments (RNase H1, TERRA masking), multiple orthogonal methods","pmids":["33082515"],"is_preprint":false},{"year":2021,"finding":"TOPBP1 interacts with Treacle (TCOF1) and forms large foci inside the nucleolus in response to replication stress; Treacle and TOPBP1 together facilitate ATR signaling at stalled replication forks inside the nucleolus and promote recruitment of downstream replication stress response proteins without forming nucleolar caps.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, ATR signaling assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, localization, and functional siRNA studies; consistent with independent findings in PMID:31913317","pmids":["34100862"],"is_preprint":false},{"year":2022,"finding":"FGF12 is localized to the nucleolus and interacts with both NOLC1 and TCOF1 in a phosphorylation-dependent manner requiring the C-terminal region of FGF12; NOLC1 and TCOF1 are unable to interact with each other in the absence of FGF12, indicating FGF12 bridges this complex.","method":"Co-immunoprecipitation, immunofluorescence localization, domain-deletion experiments, phosphorylation-dependence assays","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping and phosphorylation control, single lab","pmids":["36411431"],"is_preprint":false},{"year":2022,"finding":"The matrix (M) proteins of Henipaviruses (including Hendra and Nipah viruses) and rabies virus P3 protein target nucleolar Treacle protein and suppress ribosomal RNA synthesis, mimicking the cellular nucleolar DNA-damage response mechanism; Treacle depletion impacts mumps virus particle production and MuV matrix protein interacts with and colocalizes with Treacle in the nucleolus.","method":"Co-immunoprecipitation (viral M protein with Treacle), siRNA knockdown, rRNA synthesis assays, viral growth kinetics","journal":"Traffic (Copenhagen, Denmark) / Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional siRNA knockdown; replicated across multiple viruses/labs","pmids":["36479968","36135364"],"is_preprint":false},{"year":2025,"finding":"Treacle forms liquid-like phase condensates through electrostatic interactions; the C-terminal domain initiates phase separation while the central domain (with alternating charged residues) maintains condensate stability. These condensates are essential for nucleolar fibrillar center assembly, high-level rRNA gene transcription, accurate rRNA processing, and TOPBP1 recruitment for nucleolar DNA damage response. Mutant Treacle forms unable to phase-separate fail to support these functions.","method":"Phase condensate assays, domain-deletion mutants, overexpression of condensate-deficient mutants, rRNA transcription and processing assays, TOPBP1 recruitment assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of condensates, mutagenesis of phase-separation domains, multiple orthogonal functional readouts; single lab but comprehensive","pmids":["40223701"],"is_preprint":false},{"year":2008,"finding":"Transcription of the Tcof1 promoter is regulated by differential repression; binding of Cebpb, Zfp161, and Sp1 transcription factors to the regulatory region was detected, with Zfp161 conferring cell-type-specific repression and Sp1/Sp3 conferring cell-type-specific activation. The minimal promoter (-253 to +43 bp) directs constitutive expression.","method":"Deletion and mutation reporter assays, chromatin binding (ChIP) studies, in neural and non-neural cell lines","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays with deletion mapping and ChIP; single lab","pmids":["18771418"],"is_preprint":false},{"year":2010,"finding":"Treacle is downregulated by oxidative stress (H2O2) in lung cells through proteasome-dependent degradation independently of mRNA changes, suggesting a role in oxidant defense. Treacle suppression by siRNA increases cellular sensitivity to H2O2, and treacle reduction is independent of p53 responses.","method":"SILAC proteomics, siRNA knockdown, proteasome inhibitor experiments, H2O2 sensitivity assays","journal":"Proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SILAC quantitative proteomics plus siRNA functional assay; single lab, two orthogonal methods","pmids":["20340163"],"is_preprint":false}],"current_model":"Treacle (TCOF1) is a highly phosphorylated nucleolar phosphoprotein that nucleates liquid-like phase condensates essential for nucleolar fibrillar center assembly; it drives ribosomal DNA transcription by recruiting RNA Pol I and UBF to rDNA promoters, facilitates 2'-O-methylation of pre-rRNA through interaction with NOP56/fibrillarin, and coordinates the nucleolar DNA-damage response by serving as a scaffold that recruits NBS1, TOPBP1, and ATR signaling components to the nucleolus in response to rDNA breaks or replication stress—with ATM/CK2-dependent phosphorylation of its C-terminal Ser/Thr residues gating these interactions; additionally, during S phase Treacle redistributes to telomeres via TRF2 to suppress TERRA transcription and prevent R-loop-mediated replication fork stalling, and in mitosis Treacle associates with centrosomes/kinetochores and interacts with Plk1 to ensure correct spindle orientation and mitotic progression in neural progenitors."},"narrative":{"mechanistic_narrative":"Treacle (TCOF1) is a low-complexity, heavily phosphorylated nucleolar phosphoprotein that organizes ribosome biogenesis and the nucleolar genome-stability response [PMID:9096354, PMID:15249688]. It nucleates liquid-like phase condensates—initiated by its C-terminal domain and stabilized by an alternating-charge central region—that build the nucleolar fibrillar center and are required for high-level rDNA transcription, accurate rRNA processing, and damage-response recruitment [PMID:40223701]. Through its central repeated domain it binds RNA polymerase I while its C-terminus mediates rDNA promoter recognition and UBF recruitment, making Treacle the essential platform that loads the Pol I transcription machinery onto the nucleolus [PMID:15249688, PMID:19527688]. Treacle also enters hNop56/NOP56-associated pre-ribosomal RNP complexes and is required for 2'-O-methylation of pre-rRNA, linking it directly to rRNA modification [PMID:12777385, PMID:15930015]. Casein kinase 2 binds and phosphorylates Treacle, and this phosphorylation, together with ATM-dependent modification of conserved C-terminal Ser/Thr residues, gates its damage functions: Treacle recruits NBS1 and the phospho-peptide-binding BRCT domains of TOPBP1 into nucleoli upon rDNA double-strand breaks or replication stress, silencing rRNA synthesis, driving nucleolar segregation, and supporting ATR signaling at stalled forks [PMID:10982400, PMID:25064736, PMID:25512513, PMID:31913317, PMID:34100862]. Beyond the nucleolus, Treacle redistributes during S phase to telomeres via TRF2 to inhibit RNA Pol II, limiting TERRA and preventing R-loop-driven replication-fork stalling, and in mitosis it localizes to centrosomes/kinetochores and binds Plk1 to control spindle orientation [PMID:22479190, PMID:33082515]. Tcof1 haploinsufficiency causes a cell-autonomous deficiency of neural crest cells through reduced mature ribosome production, the basis of Treacher Collins syndrome craniofacial malformation [PMID:16938878, PMID:9736782].","teleology":[{"year":1997,"claim":"Establishing TCOF1's primary structure defined it as a low-complexity nucleolar phosphoprotein, framing the hypothesis that phosphorylation and nucleolar trafficking underlie its function.","evidence":"Genomic sequencing and bioinformatic domain analysis of the 1,411-aa protein","pmids":["9096354"],"confidence":"Medium","gaps":["Predicted phosphorylation and localization signals not yet experimentally tested","No functional assay of the repeated motifs"]},{"year":1998,"claim":"Mapping nucleolar/nuclear localization signals and showing disease-truncated protein is mislocalized connected Treacle's subcellular targeting to Treacher Collins pathology.","evidence":"GFP-fusion deletion mapping and mutagenesis of TCS mutations with live microscopy","pmids":["9811939","9736782","10982400"],"confidence":"High","gaps":["Does not define what Treacle does once in the nucleolus","Functional consequence of mislocalization at the molecular level not resolved"]},{"year":2000,"claim":"Identifying CK2 as the kinase associating with and phosphorylating Treacle gave a mechanistic basis for its predicted heavy phosphorylation.","evidence":"Co-immunoprecipitation, in vitro kinase assays, immunofluorescence","pmids":["10982400","10545604"],"confidence":"Medium","gaps":["Specific phosphosites and their functional impact not mapped","Co-IP does not prove direct kinase-substrate engagement in vivo"]},{"year":2005,"claim":"Linking Treacle to NOP56-associated RNP complexes and pre-rRNA 2'-O-methylation defined a direct role in rRNA modification beyond simple localization.","evidence":"Affinity purification/MS, RNase controls, antisense knockdown in Xenopus, Tcof1+/- mouse rRNA methylation analysis, Co-IP","pmids":["12777385","15930015"],"confidence":"High","gaps":["Whether Treacle directly stimulates the methyltransferase or acts as a scaffold unresolved","Specificity for individual methylation sites not fully mapped"]},{"year":2009,"claim":"Domain dissection showed Treacle is the essential platform recruiting Pol I and UBF to rDNA, establishing a mechanistic hierarchy for nucleolar transcription initiation.","evidence":"Co-IP, ChIP, siRNA knockdown, domain mapping","pmids":["15249688","19527688"],"confidence":"High","gaps":["Structural basis of Pol I and rDNA promoter recognition not solved","How phosphorylation modulates these interactions not addressed here"]},{"year":2006,"claim":"In vivo knockout established that Tcof1 haploinsufficiency depletes neural crest cells via reduced ribosome production, explaining Treacher Collins craniofacial defects.","evidence":"Germline Tcof1 mouse KO, neural crest lineage tracing, ribosome biogenesis assays","pmids":["16938878"],"confidence":"High","gaps":["Cell-type specificity of the requirement not fully explained","Does not address Treacle's non-ribosomal roles"]},{"year":2014,"claim":"Discovery that Treacle recruits NBS1 to nucleoli upon DNA damage, in a CK2- and ATM-phosphorylation-dependent manner, defined a nucleolar DNA-damage response that silences rRNA synthesis.","evidence":"Reciprocal Co-IP, ATM-site mutagenesis, siRNA, relocalization assays, survival assays","pmids":["25064736","25512513"],"confidence":"High","gaps":["Precise ATM phosphosites incompletely defined","How pan-nuclear silencing is propagated from the nucleolus unclear"]},{"year":2020,"claim":"Phospho-dependent BRCT-mediated TOPBP1 recruitment by Treacle, and a TRF2-mediated telomeric role suppressing TERRA, extended Treacle's scaffold function to rDNA break response and telomere replication integrity.","evidence":"Phospho-peptide binding, mutagenesis, Co-IP (TOPBP1, TRF2), ChIP, R-loop detection, RNase H1 rescue","pmids":["31913317","33082515"],"confidence":"High","gaps":["Cell-cycle switch governing nucleolar-to-telomere redistribution not mechanistically defined","How Treacle inhibits Pol II at telomeres versus recruiting Pol I at rDNA unresolved"]},{"year":2021,"claim":"Treacle–TOPBP1 foci were shown to drive ATR signaling at stalled forks within the nucleolus, integrating Treacle into the replication stress response.","evidence":"Co-IP, immunofluorescence, siRNA, ATR signaling assays","pmids":["34100862"],"confidence":"High","gaps":["Distinction between cap-forming and non-cap responses incompletely defined","Downstream effector recruitment partly uncharacterized"]},{"year":2025,"claim":"Demonstrating that Treacle drives liquid-like phase separation unified its diverse functions under a condensate-scaffolding mechanism required for fibrillar center assembly, transcription, processing, and TOPBP1 recruitment.","evidence":"Phase condensate reconstitution, domain-deletion and condensate-deficient mutants, transcription/processing and TOPBP1 recruitment assays","pmids":["40223701"],"confidence":"High","gaps":["In vivo regulation of condensate formation by phosphorylation not fully defined","How condensate composition is tuned for damage versus transcription modes unresolved"]},{"year":null,"claim":"It remains unresolved how a single phosphorylation- and condensate-dependent scaffold is dynamically partitioned across nucleolar transcription, the nucleolar DNA-damage response, telomere protection, and mitotic spindle control.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model linking cell-cycle state to Treacle's location switching","Structural basis of condensate-mediated partner selection unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,9,11,13]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[5,7]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6,9,14]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[1,2,4,5,11]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,9]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[5,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11,12,13,15]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8]}],"complexes":["NOP56-associated pre-ribosomal RNP complex","RNA Pol I transcription complex"],"partners":["UBF","NOP56","NBS1","TOPBP1","TRF2","PLK1","CK2","FGF12"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13428","full_name":"Treacle protein","aliases":["Treacher Collins syndrome protein"],"length_aa":1488,"mass_kda":152.1,"function":"Nucleolar protein that acts as a regulator of RNA polymerase I by connecting RNA polymerase I with enzymes responsible for ribosomal processing and modification (PubMed:12777385, PubMed:26399832). 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1987)","url":"https://pubmed.ncbi.nlm.nih.gov/37467918","citation_count":9,"is_preprint":false},{"pmid":"12114479","id":"PMC_12114479","title":"Novel autosomal dominant mandibulofacial dysostosis with ptosis: clinical description and exclusion of TCOF1.","date":"2002","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12114479","citation_count":9,"is_preprint":false},{"pmid":"18688869","id":"PMC_18688869","title":"Excess maternal transmission of markers in TCOF1 among cleft palate case-parent trios from three populations.","date":"2008","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/18688869","citation_count":9,"is_preprint":false},{"pmid":"15214011","id":"PMC_15214011","title":"Treacher Collins syndrome with craniosynostosis, choanal atresia, and esophageal regurgitation caused by a novel nonsense mutation in TCOF1.","date":"2004","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/15214011","citation_count":9,"is_preprint":false},{"pmid":"23856019","id":"PMC_23856019","title":"Treatability study of 3,3',4',5-tetrachlorosalicylanilide (TCS) combined with 2,4,6-trichlorophenol (TCP) to reduce excess sludge production in a sequence batch reactor.","date":"2013","source":"Bioresource technology","url":"https://pubmed.ncbi.nlm.nih.gov/23856019","citation_count":9,"is_preprint":false},{"pmid":"40223701","id":"PMC_40223701","title":"Treacle's ability to form liquid-like phase condensates is essential for nucleolar fibrillar center assembly, efficient rRNA transcription and processing, and rRNA gene repair.","date":"2025","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/40223701","citation_count":8,"is_preprint":false},{"pmid":"32351010","id":"PMC_32351010","title":"Treacher Collins syndrome: A novel TCOF1 mutation and monopodial stapes.","date":"2020","source":"Clinical otolaryngology : official journal of ENT-UK ; official journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery","url":"https://pubmed.ncbi.nlm.nih.gov/32351010","citation_count":8,"is_preprint":false},{"pmid":"32543076","id":"PMC_32543076","title":"Identification of a novel gross deletion of TCOF1 in a Chinese prenatal case with Treacher Collins syndrome.","date":"2020","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/32543076","citation_count":8,"is_preprint":false},{"pmid":"34580285","id":"PMC_34580285","title":"Identification of three novel TCOF1 mutations in patients with Treacher Collins Syndrome.","date":"2021","source":"Human genome variation","url":"https://pubmed.ncbi.nlm.nih.gov/34580285","citation_count":8,"is_preprint":false},{"pmid":"22415350","id":"PMC_22415350","title":"Novel insertion in exon 5 of the TCOF1 gene in twin sisters with Treacher Collins syndrome.","date":"2012","source":"Journal of applied genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22415350","citation_count":8,"is_preprint":false},{"pmid":"20177378","id":"PMC_20177378","title":"Exclusion of MYF5, GSC, RUNX2, and TCOF1 mutation in a case of cerebro-costo-mandibular syndrome.","date":"2010","source":"Clinical dysmorphology","url":"https://pubmed.ncbi.nlm.nih.gov/20177378","citation_count":8,"is_preprint":false},{"pmid":"18771418","id":"PMC_18771418","title":"Regulation of the mouse Treacher Collins syndrome homolog (Tcof1) promoter through differential repression of constitutive expression.","date":"2008","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/18771418","citation_count":7,"is_preprint":false},{"pmid":"32455190","id":"PMC_32455190","title":"Comparison of Transcriptomics Changes Induced by TCS and MTCS Exposure in Human Hepatoma HepG2 Cells.","date":"2020","source":"ACS omega","url":"https://pubmed.ncbi.nlm.nih.gov/32455190","citation_count":7,"is_preprint":false},{"pmid":"32706022","id":"PMC_32706022","title":"Exploration of the effects of goose TCs on GCs at different follicular stages using a co-culture model.","date":"2020","source":"Bioscience reports","url":"https://pubmed.ncbi.nlm.nih.gov/32706022","citation_count":7,"is_preprint":false},{"pmid":"36135364","id":"PMC_36135364","title":"Nucleolar Protein Treacle Is Important for the Efficient Growth of Mumps Virus.","date":"2022","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/36135364","citation_count":6,"is_preprint":false},{"pmid":"39523372","id":"PMC_39523372","title":"FOSL1 is a key regulator of a super-enhancer driving TCOF1 expression in triple-negative breast cancer.","date":"2024","source":"Epigenetics & chromatin","url":"https://pubmed.ncbi.nlm.nih.gov/39523372","citation_count":6,"is_preprint":false},{"pmid":"19067896","id":"PMC_19067896","title":"Detection of a novel silent deletion, a missense mutation and a nonsense mutation in TCOF1.","date":"2008","source":"Pediatrics international : official journal of the Japan Pediatric Society","url":"https://pubmed.ncbi.nlm.nih.gov/19067896","citation_count":6,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44961,"output_tokens":4986,"usd":0.104836,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13370,"output_tokens":3769,"usd":0.080537,"stage2_stop_reason":"end_turn"},"total_usd":0.185373,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"TCOF1 encodes a low-complexity nucleolar phosphoprotein (treacle) of 1,411 amino acids with repeated motifs shared with nucleolar trafficking proteins, predicted to be highly phosphorylated by casein kinase, and containing putative nuclear and nucleolar localization signals.\",\n      \"method\": \"Genomic sequencing, bioinformatic analysis of protein structure\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — primary sequence and domain analysis replicated in multiple independent studies characterizing the gene\",\n      \"pmids\": [\"9096354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Treacle localizes to the nucleolus, with the last 41 residues of the C-terminus (residues 1262-1302) sufficient for nucleolar localization; at least two functional nuclear localization signals exist in the C-terminal region.\",\n      \"method\": \"GFP fusion constructs with full-length and deleted domains of murine treacle expressed in cells; live fluorescence microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment with deletion mapping, confirmed with both murine and human constructs, replicated by independent lab (PMID:10982400, PMID:9736782)\",\n      \"pmids\": [\"9811939\", \"9736782\", \"10982400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"TCS mutations that create premature termination codons produce truncated treacle proteins that are mislocalized within the cell (not nucleolar), supporting the hypothesis that nucleolar shuttling is integral to treacle function.\",\n      \"method\": \"Site-directed mutagenesis recreating TCS mutations; GFP-fusion protein localization assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with direct localization, functional consequence demonstrated\",\n      \"pmids\": [\"9736782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Treacle fusion peptides can be phosphorylated by casein kinase II (CKII) and protein kinase C (PKC) in vitro; branchial arch tissue extracts contain a kinase activity consistent with CKII site recognition that phosphorylates treacle peptides, coinciding with peak treacle expression.\",\n      \"method\": \"In vitro kinase assays using GST-treacle fusion peptides with recombinant kinases and tissue extracts\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay with tissue extracts; single lab\",\n      \"pmids\": [\"10545604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Treacle is a highly phosphorylated nucleolar protein; casein kinase 2 (CK2) is responsible for its high degree of phosphorylation, as evidenced by co-immunoprecipitation of CK2 with treacle.\",\n      \"method\": \"Immunofluorescence, co-immunoprecipitation, phosphorylation analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP establishes CK2 association; consistent with independent in vitro kinase data\",\n      \"pmids\": [\"10982400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Treacle is a constituent of hNop56p-associated pre-ribosomal ribonucleoprotein complexes; the association of treacle with hNop56p is independent of rRNA integrity, indicating a direct protein-protein interaction.\",\n      \"method\": \"Affinity purification of Nop56p complexes, mass spectrometry, RNase treatment controls\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification with direct interaction supported by RNase-independence control; single lab\",\n      \"pmids\": [\"12777385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Treacle interacts physically with upstream binding factor (UBF) and is involved in ribosomal DNA (rDNA) gene transcription; siRNA knockdown of treacle inhibits rDNA transcription and cell growth.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, immunofluorescence co-localization, siRNA knockdown with rDNA transcription assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus yeast two-hybrid plus functional knockdown, multiple orthogonal methods in one study\",\n      \"pmids\": [\"15249688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Treacle participates in 2'-O-methylation of pre-rRNA; antisense knockdown of treacle in Xenopus oocytes reduces pre-rRNA methylation, and Tcof1+/- mouse embryos show significant reduction in 2'-O-methylation at specific rRNA residues. Treacle's role in methylation is mediated through direct physical interaction with NOP56, a component of the ribonucleoprotein methylation complex.\",\n      \"method\": \"Antisense knockdown in Xenopus oocytes, rRNA methylation analysis, co-immunoprecipitation of treacle with NOP56, immunofluorescence co-localization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional knockdown with direct biochemical readout in two model systems, plus Co-IP of interaction partner\",\n      \"pmids\": [\"15930015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Tcof1/Treacle is required cell-autonomously for neural crest cell formation and proliferation; haploinsufficiency of Tcof1 leads to deficiency in migrating neural crest cells causing craniofacial malformations. Tcof1/Treacle regulates proliferation by controlling production of mature ribosomes.\",\n      \"method\": \"Germ-line Tcof1 mouse knockout, neural crest cell lineage tracing, ribosome biogenesis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean in vivo KO with defined cellular phenotype and mechanistic link to ribosome biogenesis\",\n      \"pmids\": [\"16938878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The central repeated domain of treacle binds RNA polymerase I (Pol I), while the C-terminus is involved in rDNA promoter recognition and UBF recruitment. Treacle, but not UBF, is essential for nucleolar recruitment of the Pol I transcription complex; knockdown of treacle disperses Pol I and UBF from the nucleolus, but treacle-Pol I interactions and treacle-rDNA promoter interactions are not disrupted by UBF depletion.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, chromatin immunoprecipitation (ChIP), domain-mapping experiments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, ChIP, siRNA knockdown) in single lab establishing mechanistic hierarchy\",\n      \"pmids\": [\"19527688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Treacle is a novel centrosome- and kinetochore-associated protein that controls spindle orientation and mitotic progression via a direct interaction with Polo-like kinase 1 (Plk1); Tcof1 loss-of-function disrupts spindle orientation and cell cycle progression, perturbing neural progenitor maintenance during cortical neurogenesis.\",\n      \"method\": \"Co-immunoprecipitation (Treacle-Plk1 interaction), Tcof1 loss-of-function mouse model, immunofluorescence for centrosome/kinetochore localization, spindle orientation analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct Co-IP establishing Plk1 interaction, clean KO mouse with defined cellular phenotype, direct localization experiment with functional consequence\",\n      \"pmids\": [\"22479190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Treacle (TCOF1) interacts with NBS1 (Nijmegen breakage syndrome protein 1) and mediates NBS1 translocation into nucleoli in response to DNA damage, thereby triggering pan-nuclear silencing of rRNA transcription. NBS1 nucleolar accumulation is Treacle-dependent.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence relocalization assays after DNA damage induction\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, siRNA functional studies, and localization assays in two independent labs (PMID:25064736 and PMID:25512513)\",\n      \"pmids\": [\"25064736\", \"25512513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NBS1 relocalization to nucleoli after DNA damage requires TCOF1 and is dependent on casein kinase II and ATM-mediated phosphorylation of TCOF1; a putative ATM phosphorylation site in TCOF1 is required for NBS1 nucleolar relocalization. TCOF1 promotes cellular resistance to DNA-damaging agents.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of ATM phosphorylation site, siRNA knockdown, cell survival assays after DNA damage\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of functional phosphorylation site plus Co-IP plus functional assays in single rigorous study\",\n      \"pmids\": [\"25512513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Treacle recruits TOPBP1 into nucleoli in an ATM- and NBS1-dependent manner in response to rDNA double-strand breaks; this is mediated by phosphorylation-dependent interactions between three BRCT domains of TOPBP1 and conserved phosphorylated Ser/Thr residues at the C-terminus of Treacle. TOPBP1 recruitment is required for inhibition of rRNA synthesis and nucleolar segregation.\",\n      \"method\": \"Co-immunoprecipitation, phospho-peptide binding assays, siRNA knockdown, immunofluorescence, site-directed mutagenesis of phosphorylation sites\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — phospho-dependent interaction mapping with mutagenesis, multiple orthogonal methods, functional readouts\",\n      \"pmids\": [\"31913317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"During S phase, TCOF1 leaves the nucleolus and is recruited to telomeres by interacting with TRF2; at telomeres, TCOF1 suppresses telomere transcription by binding and inhibiting RNA Pol II, thereby limiting TERRA levels. Depletion of TCOF1 causes elevated TERRA, DNA/RNA R-loops, replication fork stalling, and fragile telomeres.\",\n      \"method\": \"Co-immunoprecipitation (TCOF1-TRF2), chromatin immunoprecipitation, siRNA knockdown, R-loop detection, RNase H1 rescue experiment, TERRA quantification\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP establishing TRF2 interaction, functional rescue experiments (RNase H1, TERRA masking), multiple orthogonal methods\",\n      \"pmids\": [\"33082515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TOPBP1 interacts with Treacle (TCOF1) and forms large foci inside the nucleolus in response to replication stress; Treacle and TOPBP1 together facilitate ATR signaling at stalled replication forks inside the nucleolus and promote recruitment of downstream replication stress response proteins without forming nucleolar caps.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, ATR signaling assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, localization, and functional siRNA studies; consistent with independent findings in PMID:31913317\",\n      \"pmids\": [\"34100862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FGF12 is localized to the nucleolus and interacts with both NOLC1 and TCOF1 in a phosphorylation-dependent manner requiring the C-terminal region of FGF12; NOLC1 and TCOF1 are unable to interact with each other in the absence of FGF12, indicating FGF12 bridges this complex.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization, domain-deletion experiments, phosphorylation-dependence assays\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping and phosphorylation control, single lab\",\n      \"pmids\": [\"36411431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The matrix (M) proteins of Henipaviruses (including Hendra and Nipah viruses) and rabies virus P3 protein target nucleolar Treacle protein and suppress ribosomal RNA synthesis, mimicking the cellular nucleolar DNA-damage response mechanism; Treacle depletion impacts mumps virus particle production and MuV matrix protein interacts with and colocalizes with Treacle in the nucleolus.\",\n      \"method\": \"Co-immunoprecipitation (viral M protein with Treacle), siRNA knockdown, rRNA synthesis assays, viral growth kinetics\",\n      \"journal\": \"Traffic (Copenhagen, Denmark) / Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional siRNA knockdown; replicated across multiple viruses/labs\",\n      \"pmids\": [\"36479968\", \"36135364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Treacle forms liquid-like phase condensates through electrostatic interactions; the C-terminal domain initiates phase separation while the central domain (with alternating charged residues) maintains condensate stability. These condensates are essential for nucleolar fibrillar center assembly, high-level rRNA gene transcription, accurate rRNA processing, and TOPBP1 recruitment for nucleolar DNA damage response. Mutant Treacle forms unable to phase-separate fail to support these functions.\",\n      \"method\": \"Phase condensate assays, domain-deletion mutants, overexpression of condensate-deficient mutants, rRNA transcription and processing assays, TOPBP1 recruitment assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of condensates, mutagenesis of phase-separation domains, multiple orthogonal functional readouts; single lab but comprehensive\",\n      \"pmids\": [\"40223701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Transcription of the Tcof1 promoter is regulated by differential repression; binding of Cebpb, Zfp161, and Sp1 transcription factors to the regulatory region was detected, with Zfp161 conferring cell-type-specific repression and Sp1/Sp3 conferring cell-type-specific activation. The minimal promoter (-253 to +43 bp) directs constitutive expression.\",\n      \"method\": \"Deletion and mutation reporter assays, chromatin binding (ChIP) studies, in neural and non-neural cell lines\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays with deletion mapping and ChIP; single lab\",\n      \"pmids\": [\"18771418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Treacle is downregulated by oxidative stress (H2O2) in lung cells through proteasome-dependent degradation independently of mRNA changes, suggesting a role in oxidant defense. Treacle suppression by siRNA increases cellular sensitivity to H2O2, and treacle reduction is independent of p53 responses.\",\n      \"method\": \"SILAC proteomics, siRNA knockdown, proteasome inhibitor experiments, H2O2 sensitivity assays\",\n      \"journal\": \"Proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SILAC quantitative proteomics plus siRNA functional assay; single lab, two orthogonal methods\",\n      \"pmids\": [\"20340163\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Treacle (TCOF1) is a highly phosphorylated nucleolar phosphoprotein that nucleates liquid-like phase condensates essential for nucleolar fibrillar center assembly; it drives ribosomal DNA transcription by recruiting RNA Pol I and UBF to rDNA promoters, facilitates 2'-O-methylation of pre-rRNA through interaction with NOP56/fibrillarin, and coordinates the nucleolar DNA-damage response by serving as a scaffold that recruits NBS1, TOPBP1, and ATR signaling components to the nucleolus in response to rDNA breaks or replication stress—with ATM/CK2-dependent phosphorylation of its C-terminal Ser/Thr residues gating these interactions; additionally, during S phase Treacle redistributes to telomeres via TRF2 to suppress TERRA transcription and prevent R-loop-mediated replication fork stalling, and in mitosis Treacle associates with centrosomes/kinetochores and interacts with Plk1 to ensure correct spindle orientation and mitotic progression in neural progenitors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Treacle (TCOF1) is a low-complexity, heavily phosphorylated nucleolar phosphoprotein that organizes ribosome biogenesis and the nucleolar genome-stability response [#0, #6]. It nucleates liquid-like phase condensates—initiated by its C-terminal domain and stabilized by an alternating-charge central region—that build the nucleolar fibrillar center and are required for high-level rDNA transcription, accurate rRNA processing, and damage-response recruitment [#18]. Through its central repeated domain it binds RNA polymerase I while its C-terminus mediates rDNA promoter recognition and UBF recruitment, making Treacle the essential platform that loads the Pol I transcription machinery onto the nucleolus [#6, #9]. Treacle also enters hNop56/NOP56-associated pre-ribosomal RNP complexes and is required for 2'-O-methylation of pre-rRNA, linking it directly to rRNA modification [#5, #7]. Casein kinase 2 binds and phosphorylates Treacle, and this phosphorylation, together with ATM-dependent modification of conserved C-terminal Ser/Thr residues, gates its damage functions: Treacle recruits NBS1 and the phospho-peptide-binding BRCT domains of TOPBP1 into nucleoli upon rDNA double-strand breaks or replication stress, silencing rRNA synthesis, driving nucleolar segregation, and supporting ATR signaling at stalled forks [#4, #11, #12, #13, #15]. Beyond the nucleolus, Treacle redistributes during S phase to telomeres via TRF2 to inhibit RNA Pol II, limiting TERRA and preventing R-loop-driven replication-fork stalling, and in mitosis it localizes to centrosomes/kinetochores and binds Plk1 to control spindle orientation [#10, #14]. Tcof1 haploinsufficiency causes a cell-autonomous deficiency of neural crest cells through reduced mature ribosome production, the basis of Treacher Collins syndrome craniofacial malformation [#8, #2].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing TCOF1's primary structure defined it as a low-complexity nucleolar phosphoprotein, framing the hypothesis that phosphorylation and nucleolar trafficking underlie its function.\",\n      \"evidence\": \"Genomic sequencing and bioinformatic domain analysis of the 1,411-aa protein\",\n      \"pmids\": [\"9096354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Predicted phosphorylation and localization signals not yet experimentally tested\", \"No functional assay of the repeated motifs\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Mapping nucleolar/nuclear localization signals and showing disease-truncated protein is mislocalized connected Treacle's subcellular targeting to Treacher Collins pathology.\",\n      \"evidence\": \"GFP-fusion deletion mapping and mutagenesis of TCS mutations with live microscopy\",\n      \"pmids\": [\"9811939\", \"9736782\", \"10982400\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define what Treacle does once in the nucleolus\", \"Functional consequence of mislocalization at the molecular level not resolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying CK2 as the kinase associating with and phosphorylating Treacle gave a mechanistic basis for its predicted heavy phosphorylation.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro kinase assays, immunofluorescence\",\n      \"pmids\": [\"10982400\", \"10545604\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific phosphosites and their functional impact not mapped\", \"Co-IP does not prove direct kinase-substrate engagement in vivo\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking Treacle to NOP56-associated RNP complexes and pre-rRNA 2'-O-methylation defined a direct role in rRNA modification beyond simple localization.\",\n      \"evidence\": \"Affinity purification/MS, RNase controls, antisense knockdown in Xenopus, Tcof1+/- mouse rRNA methylation analysis, Co-IP\",\n      \"pmids\": [\"12777385\", \"15930015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Treacle directly stimulates the methyltransferase or acts as a scaffold unresolved\", \"Specificity for individual methylation sites not fully mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Domain dissection showed Treacle is the essential platform recruiting Pol I and UBF to rDNA, establishing a mechanistic hierarchy for nucleolar transcription initiation.\",\n      \"evidence\": \"Co-IP, ChIP, siRNA knockdown, domain mapping\",\n      \"pmids\": [\"15249688\", \"19527688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Pol I and rDNA promoter recognition not solved\", \"How phosphorylation modulates these interactions not addressed here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"In vivo knockout established that Tcof1 haploinsufficiency depletes neural crest cells via reduced ribosome production, explaining Treacher Collins craniofacial defects.\",\n      \"evidence\": \"Germline Tcof1 mouse KO, neural crest lineage tracing, ribosome biogenesis assays\",\n      \"pmids\": [\"16938878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type specificity of the requirement not fully explained\", \"Does not address Treacle's non-ribosomal roles\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that Treacle recruits NBS1 to nucleoli upon DNA damage, in a CK2- and ATM-phosphorylation-dependent manner, defined a nucleolar DNA-damage response that silences rRNA synthesis.\",\n      \"evidence\": \"Reciprocal Co-IP, ATM-site mutagenesis, siRNA, relocalization assays, survival assays\",\n      \"pmids\": [\"25064736\", \"25512513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise ATM phosphosites incompletely defined\", \"How pan-nuclear silencing is propagated from the nucleolus unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Phospho-dependent BRCT-mediated TOPBP1 recruitment by Treacle, and a TRF2-mediated telomeric role suppressing TERRA, extended Treacle's scaffold function to rDNA break response and telomere replication integrity.\",\n      \"evidence\": \"Phospho-peptide binding, mutagenesis, Co-IP (TOPBP1, TRF2), ChIP, R-loop detection, RNase H1 rescue\",\n      \"pmids\": [\"31913317\", \"33082515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-cycle switch governing nucleolar-to-telomere redistribution not mechanistically defined\", \"How Treacle inhibits Pol II at telomeres versus recruiting Pol I at rDNA unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Treacle–TOPBP1 foci were shown to drive ATR signaling at stalled forks within the nucleolus, integrating Treacle into the replication stress response.\",\n      \"evidence\": \"Co-IP, immunofluorescence, siRNA, ATR signaling assays\",\n      \"pmids\": [\"34100862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinction between cap-forming and non-cap responses incompletely defined\", \"Downstream effector recruitment partly uncharacterized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that Treacle drives liquid-like phase separation unified its diverse functions under a condensate-scaffolding mechanism required for fibrillar center assembly, transcription, processing, and TOPBP1 recruitment.\",\n      \"evidence\": \"Phase condensate reconstitution, domain-deletion and condensate-deficient mutants, transcription/processing and TOPBP1 recruitment assays\",\n      \"pmids\": [\"40223701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo regulation of condensate formation by phosphorylation not fully defined\", \"How condensate composition is tuned for damage versus transcription modes unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single phosphorylation- and condensate-dependent scaffold is dynamically partitioned across nucleolar transcription, the nucleolar DNA-damage response, telomere protection, and mitotic spindle control.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model linking cell-cycle state to Treacle's location switching\", \"Structural basis of condensate-mediated partner selection unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 9, 11, 13]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [5, 7]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6, 9, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [1, 2, 4, 5, 11]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [5, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 12, 13, 15]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"NOP56-associated pre-ribosomal RNP complex\",\n      \"RNA Pol I transcription complex\"\n    ],\n    \"partners\": [\n      \"UBF\",\n      \"NOP56\",\n      \"NBS1\",\n      \"TOPBP1\",\n      \"TRF2\",\n      \"PLK1\",\n      \"CK2\",\n      \"FGF12\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}