{"gene":"UTP15","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2011,"finding":"Loss-of-function of utp15 in zebrafish (via splice-site mutation or morpholino knockdown) causes massive apoptosis and vascular patterning defects (delayed ISV sprouting, CVP malformation); these phenotypes are rescued by wild-type utp15 mRNA overexpression and prevented by p53 morpholino knockdown, placing p53 downstream of Utp15 deficiency in mediating cell death and anti-angiogenic effects.","method":"Forward genetic screen, genetic mapping/sequencing, mRNA rescue, morpholino knockdown (p53), live imaging of vascular markers in zebrafish embryos","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by morpholino rescue and mRNA complementation, two orthogonal methods, single lab","pmids":["21949834"],"is_preprint":false},{"year":2013,"finding":"Human UTP15 is a component of the t-UTP sub-complex of the SSU processome; it localizes to the fibrillar center region of nucleoli, binds directly in vitro to CIRH1A and WDR43, moves very slowly in living cells independently of rDNA transcription, and this interaction is suppressed when CIRH1A is phosphorylated at Thr131 by mitotic Xenopus egg extract.","method":"Nuclear matrix fractionation, GFP-fusion live-cell imaging (FRAP/mobility), in vitro GST pulldown, phosphorylation assay with Xenopus egg extract, confocal microscopy","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro binding plus live-cell localization, single lab, two orthogonal methods","pmids":["24219289"],"is_preprint":false},{"year":2014,"finding":"Human UTP15 (t-UTP sub-complex component) is immobilized in fibrillar centers of nucleoli in living cells, consistent with a structural scaffold role within the SSU processome; when rRNA transcription is suppressed, UTP-B sub-complex components redistribute but t-UTP components (including UTP15) remain immobile, indicating UTP15 mobility is independent of active rRNA transcription.","method":"GFP-fusion live-cell imaging, FRAP, RNA polymerase I inhibition (ActD treatment), confocal microscopy in HeLa cells","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional perturbation (transcription inhibition), single lab, replicated from 2013 study","pmids":["24754225"],"is_preprint":false},{"year":2025,"finding":"UTP15 functions as a key activator of pluripotency-associated gene transcription in mouse embryonic stem cells independently of its canonical rRNA biogenesis role; NANOG-regulated transcription enhances UTP15 binding to transcription start sites (TSSs), associated with increased Pol II binding; UTP15 promotes assembly of Pol II biomolecular condensates to drive pluripotency gene transcription.","method":"5-ethynyluridine RNA metabolic labeling + click chemistry (nascent RNA profiling), acute NANOG degradation (degron system), ChIP/CUT&RUN for UTP15 and Pol II at TSSs, condensate imaging, loss-of-function in mESCs with pluripotency gene readout","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (nascent RNA profiling, chromatin binding, condensate assay, genetic loss-of-function), single lab but rigorous multi-method study","pmids":["41361183"],"is_preprint":false}],"current_model":"UTP15 is a WD-repeat protein that localizes to nucleolar fibrillar centers as part of the t-UTP sub-complex of the SSU processome, where it directly binds CIRH1A and WDR43 to scaffold rRNA biogenesis; additionally, in pluripotent stem cells, UTP15 acts independently of rRNA biogenesis to bind transcription start sites, promote RNA Pol II condensate assembly, and activate pluripotency gene transcription downstream of NANOG, while in vivo its loss triggers p53-dependent apoptosis and vascular patterning defects."},"narrative":{"mechanistic_narrative":"UTP15 is a WD-repeat protein that operates at the interface of ribosome biogenesis and gene-expression control, functioning both as a structural scaffold of the small-subunit (SSU) processome and as a transcriptional activator [PMID:24219289, PMID:41361183]. As a component of the t-UTP sub-complex, human UTP15 localizes to the fibrillar centers of nucleoli, where it directly binds CIRH1A and WDR43 in vitro; this CIRH1A interaction is suppressed by mitotic phosphorylation of CIRH1A at Thr131 [PMID:24219289]. UTP15 is essentially immobile within fibrillar centers, and unlike UTP-B components it remains stably positioned when RNA polymerase I transcription is inhibited, consistent with a transcription-independent scaffolding role in rRNA biogenesis [PMID:24754225]. Beyond ribosome biogenesis, in mouse embryonic stem cells UTP15 acts independently of its rRNA role as a key activator of pluripotency-associated transcription: NANOG-regulated transcription enhances UTP15 binding to transcription start sites, increasing Pol II occupancy, and UTP15 promotes assembly of Pol II biomolecular condensates to drive pluripotency gene expression [PMID:41361183]. Consistent with an essential developmental function, loss of utp15 in zebrafish triggers p53-dependent apoptosis and vascular patterning defects that are rescued by wild-type mRNA and prevented by p53 knockdown [PMID:21949834].","teleology":[{"year":2011,"claim":"Established that UTP15 is required for embryonic survival and vascular development, and placed p53 as the downstream effector of UTP15 deficiency.","evidence":"Forward genetic screen, morpholino knockdown, mRNA rescue and p53 epistasis in zebrafish embryos with vascular marker imaging","pmids":["21949834"],"confidence":"Medium","gaps":["Did not define the molecular function of Utp15 driving the phenotype","Whether p53 activation reflects nucleolar/ribosome biogenesis stress was not shown","No mammalian validation of the vascular phenotype"]},{"year":2013,"claim":"Defined UTP15 as a t-UTP sub-complex member of the SSU processome with direct protein partners and regulated assembly, answering what molecular machine it belongs to.","evidence":"Nuclear matrix fractionation, GFP live-cell imaging, in vitro GST pulldown with CIRH1A/WDR43, and phosphorylation assay with Xenopus egg extract","pmids":["24219289"],"confidence":"Medium","gaps":["Binding shown in vitro; stoichiometry and architecture within the assembled processome not resolved","Functional consequence of the Thr131 phosphorylation on rRNA processing not tested","No structural model of the UTP15-CIRH1A-WDR43 interface"]},{"year":2014,"claim":"Showed UTP15 mobility is independent of active rRNA transcription, distinguishing t-UTP from UTP-B behavior and supporting a stable scaffold role.","evidence":"FRAP and GFP imaging with RNA polymerase I inhibition (actinomycin D) in HeLa cells","pmids":["24754225"],"confidence":"Medium","gaps":["What anchors UTP15 in fibrillar centers is unknown","Does not connect immobility to a specific step in rRNA processing"]},{"year":2025,"claim":"Revealed a moonlighting, rRNA-independent function for UTP15 as a NANOG-downstream activator of pluripotency transcription via Pol II condensate assembly.","evidence":"Nascent RNA profiling, NANOG acute degron, CUT&RUN/ChIP for UTP15 and Pol II at TSSs, condensate imaging, and loss-of-function in mESCs","pmids":["41361183"],"confidence":"High","gaps":["How UTP15 is recruited to TSSs mechanistically is not defined","Whether the same domains mediate rRNA scaffolding and TSS binding is unknown","Generality beyond pluripotency genes / other cell types not tested"]},{"year":null,"claim":"How UTP15's nucleolar scaffolding role and its nucleoplasmic transcription-activation role are coordinated, and how either connects to the p53-dependent developmental phenotypes, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking ribosome biogenesis, transcriptional condensate function, and p53 activation","Structural basis of partner binding unresolved","No human disease association established in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3]}],"complexes":["SSU processome (t-UTP sub-complex)"],"partners":["CIRH1A","WDR43","NANOG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TED0","full_name":"U3 small nucleolar RNA-associated protein 15 homolog","aliases":[],"length_aa":518,"mass_kda":58.4,"function":"Ribosome biogenesis factor. Involved in nucleolar processing of pre-18S ribosomal RNA. Required for optimal pre-ribosomal RNA transcription by RNA polymerase I (PubMed:17699751). 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","url":"https://www.uniprot.org/uniprotkb/Q8TED0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/UTP15","classification":"Common Essential","n_dependent_lines":1207,"n_total_lines":1208,"dependency_fraction":0.9991721854304636},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"NOL11","stoichiometry":4.0},{"gene":"WDR75","stoichiometry":4.0},{"gene":"SRP9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/UTP15","total_profiled":1310},"omim":[{"mim_id":"616195","title":"WD REPEAT-CONTAINING PROTEIN 43; WDR43","url":"https://www.omim.org/entry/616195"},{"mim_id":"616194","title":"UTP15 SMALL SUBUNIT PROCESSOME COMPONENT; UTP15","url":"https://www.omim.org/entry/616194"},{"mim_id":"607456","title":"UTP4 SMALL SUBUNIT PROCESSOME COMPONENT; UTP4","url":"https://www.omim.org/entry/607456"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoli","reliability":"Approved"},{"location":"Endoplasmic reticulum","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":34.8}],"url":"https://www.proteinatlas.org/search/UTP15"},"hgnc":{"alias_symbol":["FLJ12787","NET21","FLJ23637"],"prev_symbol":[]},"alphafold":{"accession":"Q8TED0","domains":[{"cath_id":"2.130.10.10","chopping":"23-318","consensus_level":"high","plddt":90.0054,"start":23,"end":318},{"cath_id":"1.25.40","chopping":"364-474","consensus_level":"high","plddt":84.923,"start":364,"end":474}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TED0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TED0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TED0-F1-predicted_aligned_error_v6.png","plddt_mean":82.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=UTP15","jax_strain_url":"https://www.jax.org/strain/search?query=UTP15"},"sequence":{"accession":"Q8TED0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TED0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TED0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TED0"}},"corpus_meta":[{"pmid":"25014687","id":"PMC_25014687","title":"Lanreotide in metastatic enteropancreatic neuroendocrine tumors.","date":"2014","source":"The New England journal of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25014687","citation_count":1393,"is_preprint":false},{"pmid":"31707430","id":"PMC_31707430","title":"Broadening horizons with 225Ac-DOTATATE targeted alpha therapy for gastroenteropancreatic neuroendocrine tumour patients stable or refractory to 177Lu-DOTATATE PRRT: first clinical experience on the efficacy and safety.","date":"2019","source":"European journal of nuclear medicine and molecular imaging","url":"https://pubmed.ncbi.nlm.nih.gov/31707430","citation_count":161,"is_preprint":false},{"pmid":"38625939","id":"PMC_38625939","title":"Integrated mutational landscape analysis of poorly differentiated high-grade neuroendocrine carcinoma of the uterine cervix.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/38625939","citation_count":17,"is_preprint":false},{"pmid":"24754225","id":"PMC_24754225","title":"Dynamics of WD-repeat containing proteins in SSU processome components.","date":"2014","source":"Biochemistry and cell biology = Biochimie et biologie cellulaire","url":"https://pubmed.ncbi.nlm.nih.gov/24754225","citation_count":17,"is_preprint":false},{"pmid":"35326587","id":"PMC_35326587","title":"Health-Related Quality of Life (HRQoL) in Neuroendocrine Tumors: A Systematic Review.","date":"2022","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/35326587","citation_count":17,"is_preprint":false},{"pmid":"35210299","id":"PMC_35210299","title":"Safety of Peptide Receptor Radionuclide Therapy with 177Lu-DOTATATE in Neuroendocrine Tumor Patients with Chronic Kidney Disease.","date":"2022","source":"Journal of nuclear medicine : official publication, Society of Nuclear Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35210299","citation_count":16,"is_preprint":false},{"pmid":"21949834","id":"PMC_21949834","title":"Mutation in utp15 disrupts vascular patterning in a p53-dependent manner in zebrafish embryos.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21949834","citation_count":8,"is_preprint":false},{"pmid":"34631352","id":"PMC_34631352","title":"Scouting for common genes in the heterogenous hypoxic tumor microenvironment and their validation in glioblastoma.","date":"2021","source":"3 Biotech","url":"https://pubmed.ncbi.nlm.nih.gov/34631352","citation_count":6,"is_preprint":false},{"pmid":"35488399","id":"PMC_35488399","title":"Relationship between somatostatin receptor expressing tumour volume and health-related quality of life in patients with metastatic GEP-NET.","date":"2022","source":"Journal of neuroendocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/35488399","citation_count":6,"is_preprint":false},{"pmid":"22140378","id":"PMC_22140378","title":"FOXD1 Duplication Causes Branchial Defects and Interacts with the TFAP2A Gene Implicated in the Branchio-Oculo-Facial Syndrome in Causing Eye Effects in Zebrafish.","date":"2011","source":"Molecular syndromology","url":"https://pubmed.ncbi.nlm.nih.gov/22140378","citation_count":6,"is_preprint":false},{"pmid":"37167406","id":"PMC_37167406","title":"Safety and Efficacy of 177 Lu-DOTATATE in Neuroendocrine Tumor Patients With Extensive Bone Disease.","date":"2023","source":"Clinical nuclear medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37167406","citation_count":5,"is_preprint":false},{"pmid":"24219289","id":"PMC_24219289","title":"Interaction, mobility, and phosphorylation of human orthologues of WD repeat-containing components of the yeast SSU processome t-UTP sub-complex.","date":"2013","source":"Biochemistry and cell biology = Biochimie et biologie cellulaire","url":"https://pubmed.ncbi.nlm.nih.gov/24219289","citation_count":4,"is_preprint":false},{"pmid":"31594943","id":"PMC_31594943","title":"ClimCKmap, a spatially, temporally and climatically explicit distribution database for the Italian fauna.","date":"2019","source":"Scientific data","url":"https://pubmed.ncbi.nlm.nih.gov/31594943","citation_count":3,"is_preprint":false},{"pmid":"41111031","id":"PMC_41111031","title":"177Lu-Dotatate versus high-dose long-acting octreotide for the treatment of patients with advanced, grade 1-2, well-differentiated gastroenteropancreatic neuroendocrine tumours (XT-XTR008-3-01): an open-label, randomised, phase III trial.","date":"2025","source":"Annals of oncology : official journal of the European Society for Medical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41111031","citation_count":1,"is_preprint":false},{"pmid":"36395404","id":"PMC_36395404","title":"Prospective Cohort Real-World Study on Neuroendocrine Tumor Patient's Quality of Life During Peptide Receptor Radionuclide Therapy With 177Lu-DOTATATE.","date":"2022","source":"Pancreas","url":"https://pubmed.ncbi.nlm.nih.gov/36395404","citation_count":1,"is_preprint":false},{"pmid":"41361183","id":"PMC_41361183","title":"Monitoring rapid degradation of NANOG reveals UTP15 maintains pluripotency by regulating nascent transcripts.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/41361183","citation_count":0,"is_preprint":false},{"pmid":"38482315","id":"PMC_38482315","title":"In silico characterization and identification of compound heterozygous variants in H/ACA Ribonucleoprotein Assembly Factor (SHQ1) from Indian population.","date":"2024","source":"Journal of family medicine and primary care","url":"https://pubmed.ncbi.nlm.nih.gov/38482315","citation_count":0,"is_preprint":false},{"pmid":"42236004","id":"PMC_42236004","title":"Impact of peptide receptor radionuclide therapy (PRRT) on the quality of life in patients with neuroendocrine tumours.","date":"2026","source":"Journal of neuroendocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/42236004","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12835,"output_tokens":1212,"usd":0.028342,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7833,"output_tokens":2095,"usd":0.04577,"stage2_stop_reason":"end_turn"},"total_usd":0.074112,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"Loss-of-function of utp15 in zebrafish (via splice-site mutation or morpholino knockdown) causes massive apoptosis and vascular patterning defects (delayed ISV sprouting, CVP malformation); these phenotypes are rescued by wild-type utp15 mRNA overexpression and prevented by p53 morpholino knockdown, placing p53 downstream of Utp15 deficiency in mediating cell death and anti-angiogenic effects.\",\n      \"method\": \"Forward genetic screen, genetic mapping/sequencing, mRNA rescue, morpholino knockdown (p53), live imaging of vascular markers in zebrafish embryos\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by morpholino rescue and mRNA complementation, two orthogonal methods, single lab\",\n      \"pmids\": [\"21949834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Human UTP15 is a component of the t-UTP sub-complex of the SSU processome; it localizes to the fibrillar center region of nucleoli, binds directly in vitro to CIRH1A and WDR43, moves very slowly in living cells independently of rDNA transcription, and this interaction is suppressed when CIRH1A is phosphorylated at Thr131 by mitotic Xenopus egg extract.\",\n      \"method\": \"Nuclear matrix fractionation, GFP-fusion live-cell imaging (FRAP/mobility), in vitro GST pulldown, phosphorylation assay with Xenopus egg extract, confocal microscopy\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro binding plus live-cell localization, single lab, two orthogonal methods\",\n      \"pmids\": [\"24219289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human UTP15 (t-UTP sub-complex component) is immobilized in fibrillar centers of nucleoli in living cells, consistent with a structural scaffold role within the SSU processome; when rRNA transcription is suppressed, UTP-B sub-complex components redistribute but t-UTP components (including UTP15) remain immobile, indicating UTP15 mobility is independent of active rRNA transcription.\",\n      \"method\": \"GFP-fusion live-cell imaging, FRAP, RNA polymerase I inhibition (ActD treatment), confocal microscopy in HeLa cells\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional perturbation (transcription inhibition), single lab, replicated from 2013 study\",\n      \"pmids\": [\"24754225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"UTP15 functions as a key activator of pluripotency-associated gene transcription in mouse embryonic stem cells independently of its canonical rRNA biogenesis role; NANOG-regulated transcription enhances UTP15 binding to transcription start sites (TSSs), associated with increased Pol II binding; UTP15 promotes assembly of Pol II biomolecular condensates to drive pluripotency gene transcription.\",\n      \"method\": \"5-ethynyluridine RNA metabolic labeling + click chemistry (nascent RNA profiling), acute NANOG degradation (degron system), ChIP/CUT&RUN for UTP15 and Pol II at TSSs, condensate imaging, loss-of-function in mESCs with pluripotency gene readout\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (nascent RNA profiling, chromatin binding, condensate assay, genetic loss-of-function), single lab but rigorous multi-method study\",\n      \"pmids\": [\"41361183\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UTP15 is a WD-repeat protein that localizes to nucleolar fibrillar centers as part of the t-UTP sub-complex of the SSU processome, where it directly binds CIRH1A and WDR43 to scaffold rRNA biogenesis; additionally, in pluripotent stem cells, UTP15 acts independently of rRNA biogenesis to bind transcription start sites, promote RNA Pol II condensate assembly, and activate pluripotency gene transcription downstream of NANOG, while in vivo its loss triggers p53-dependent apoptosis and vascular patterning defects.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"UTP15 is a WD-repeat protein that operates at the interface of ribosome biogenesis and gene-expression control, functioning both as a structural scaffold of the small-subunit (SSU) processome and as a transcriptional activator [#1, #3]. As a component of the t-UTP sub-complex, human UTP15 localizes to the fibrillar centers of nucleoli, where it directly binds CIRH1A and WDR43 in vitro; this CIRH1A interaction is suppressed by mitotic phosphorylation of CIRH1A at Thr131 [#1]. UTP15 is essentially immobile within fibrillar centers, and unlike UTP-B components it remains stably positioned when RNA polymerase I transcription is inhibited, consistent with a transcription-independent scaffolding role in rRNA biogenesis [#2]. Beyond ribosome biogenesis, in mouse embryonic stem cells UTP15 acts independently of its rRNA role as a key activator of pluripotency-associated transcription: NANOG-regulated transcription enhances UTP15 binding to transcription start sites, increasing Pol II occupancy, and UTP15 promotes assembly of Pol II biomolecular condensates to drive pluripotency gene expression [#3]. Consistent with an essential developmental function, loss of utp15 in zebrafish triggers p53-dependent apoptosis and vascular patterning defects that are rescued by wild-type mRNA and prevented by p53 knockdown [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that UTP15 is required for embryonic survival and vascular development, and placed p53 as the downstream effector of UTP15 deficiency.\",\n      \"evidence\": \"Forward genetic screen, morpholino knockdown, mRNA rescue and p53 epistasis in zebrafish embryos with vascular marker imaging\",\n      \"pmids\": [\"21949834\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Did not define the molecular function of Utp15 driving the phenotype\",\n        \"Whether p53 activation reflects nucleolar/ribosome biogenesis stress was not shown\",\n        \"No mammalian validation of the vascular phenotype\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined UTP15 as a t-UTP sub-complex member of the SSU processome with direct protein partners and regulated assembly, answering what molecular machine it belongs to.\",\n      \"evidence\": \"Nuclear matrix fractionation, GFP live-cell imaging, in vitro GST pulldown with CIRH1A/WDR43, and phosphorylation assay with Xenopus egg extract\",\n      \"pmids\": [\"24219289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Binding shown in vitro; stoichiometry and architecture within the assembled processome not resolved\",\n        \"Functional consequence of the Thr131 phosphorylation on rRNA processing not tested\",\n        \"No structural model of the UTP15-CIRH1A-WDR43 interface\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed UTP15 mobility is independent of active rRNA transcription, distinguishing t-UTP from UTP-B behavior and supporting a stable scaffold role.\",\n      \"evidence\": \"FRAP and GFP imaging with RNA polymerase I inhibition (actinomycin D) in HeLa cells\",\n      \"pmids\": [\"24754225\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"What anchors UTP15 in fibrillar centers is unknown\",\n        \"Does not connect immobility to a specific step in rRNA processing\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a moonlighting, rRNA-independent function for UTP15 as a NANOG-downstream activator of pluripotency transcription via Pol II condensate assembly.\",\n      \"evidence\": \"Nascent RNA profiling, NANOG acute degron, CUT&RUN/ChIP for UTP15 and Pol II at TSSs, condensate imaging, and loss-of-function in mESCs\",\n      \"pmids\": [\"41361183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How UTP15 is recruited to TSSs mechanistically is not defined\",\n        \"Whether the same domains mediate rRNA scaffolding and TSS binding is unknown\",\n        \"Generality beyond pluripotency genes / other cell types not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How UTP15's nucleolar scaffolding role and its nucleoplasmic transcription-activation role are coordinated, and how either connects to the p53-dependent developmental phenotypes, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No unified model linking ribosome biogenesis, transcriptional condensate function, and p53 activation\",\n        \"Structural basis of partner binding unresolved\",\n        \"No human disease association established in the corpus\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\"SSU processome (t-UTP sub-complex)\"],\n    \"partners\": [\"CIRH1A\", \"WDR43\", \"NANOG\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}