{"gene":"UTP25","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2010,"finding":"Yeast Utp25 (YIL091C) is a component of the SSU processome; genetic depletion causes 18S rRNA maturation defects at sites A0, A1, and A2. Co-immunoprecipitation confirmed association with U3 snoRNA, Mpp10, and components of t-Utp/UtpA, UtpB, and U3 snoRNP subcomplexes. Two-hybrid screening identified interactions with Mpp10, Utp3, and Utp21, providing the first inter-subcomplex connections within the SSU processome. The C-terminal DUF1253 domain is required and sufficient for interaction with Utp3. Mutation of conserved motif Ia residues produced no growth defect, indicating this putative helicase motif is dispensable for function.","method":"Genetic depletion + Northern analysis, co-immunoprecipitation, yeast two-hybrid, domain truncation/mutagenesis","journal":"RNA","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (genetic depletion with rRNA processing assay, reciprocal Co-IP, two-hybrid, domain mutagenesis) in a single focused study","pmids":["20884785"],"is_preprint":false},{"year":2005,"finding":"Zebrafish def (digestive organ expansion factor) encodes a pan-endoderm-specific nuclear factor required for digestive organ growth. Loss-of-function of def selectively upregulates Delta113p53 expression within mutant digestive organs, triggering p53-responsive cell-cycle arrest (but not apoptosis), resulting in hypoplastic organs.","method":"Zebrafish loss-of-function mutant (defhi429), genetic epistasis with p53 pathway, in situ hybridization, cell-cycle analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function mutant with specific molecular phenotype (selective Delta113p53 upregulation, cell-cycle arrest), replicated across multiple assays in a focused study","pmids":["16322560"],"is_preprint":false},{"year":2013,"finding":"Def is a nucleolar protein; loss of def causes p53 protein to accumulate in nucleoli. Def mediates proteasome-independent degradation of p53 through the cysteine protease Calpain3 (CAPN3). This defines a novel nucleolar protein degradation pathway for p53 turnover.","method":"Zebrafish loss-of-function, subcellular fractionation/immunofluorescence, proteasome inhibitor controls, genetic epistasis with CAPN3, overexpression rescue","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments, functional epistasis with CAPN3, proteasome-independence demonstrated with inhibitors, multiple orthogonal approaches in one focused study","pmids":["23357851"],"is_preprint":false},{"year":2016,"finding":"Def directly interacts with CAPN3 in the nucleolus and determines nucleolar localization of CAPN3, which is a prerequisite for p53 degradation there. Def is phosphorylated at five serine residues (S50, S58, S62, S87, S92); simultaneous phosphorylation at S87 and S92 facilitates nucleolar localization of CAPN3, which is essential for p53 degradation and cell-cycle progression. CAPN3 degrades wild-type p53 and mutants p53A138V, p53M237I, p53R248W, and p53R273P, but not p53R175H.","method":"Co-immunoprecipitation, site-directed mutagenesis of phosphorylation sites, subcellular localization (immunofluorescence/fractionation), zebrafish genetics, cell-cycle analysis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct protein interaction, phosphorylation site mutagenesis with functional readouts, localization experiments with functional consequence, multiple orthogonal methods","pmids":["27657329"],"is_preprint":false},{"year":2017,"finding":"DEF functions in pre-rRNA processing as an SSU processome component in vivo. def-deficient zebrafish show underdeveloped peripheral sympathetic nervous system; def haploinsufficiency reduces disease penetrance and tumor growth in a MYCN-driven transgenic neuroblastoma model. MYCN overexpression shifts pre-rRNA processing from Pathway 1 to Pathway 2 (different temporal order of cleavages), and DEF depletion in human neuroblastoma cell lines induces apoptosis.","method":"Zebrafish loss-of-function genetics, transgenic neuroblastoma model, siRNA knockdown in human cell lines, Northern/pre-rRNA processing analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic models with specific molecular readouts (rRNA pathway switching, apoptosis upon knockdown), replicated across zebrafish and human cell lines","pmids":["28263972"],"is_preprint":false},{"year":2014,"finding":"Zebrafish def haploinsufficiency activates a p53-dependent TGFβ signaling pathway after partial hepatectomy, resulting in prolonged inflammatory response, impaired leukocyte clearance, and fibrotic scar formation at the amputation site. This phenotype was rescued by Def overexpression, p53 loss-of-function, anti-inflammatory dexamethasone, or TGFβ inhibitor SB431542. Def-p53 pathway suppresses fibrosis at least in part through regulation of HMGB1 (high-mobility group box 1).","method":"Zebrafish genetics (haploinsufficiency model), partial hepatectomy, genetic epistasis (p53 loss-of-function rescue), pharmacological inhibitors, molecular pathway analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological epistasis experiments with specific molecular pathway placement (Def → p53 → TGFβ → fibrosis), rescue experiments provide mechanistic validation","pmids":["24801718"],"is_preprint":false},{"year":2013,"finding":"Def functions cell-autonomously during liver development; transgenic liver-specific Def overexpression restores liver but not exocrine pancreas or intestine development in def mutant zebrafish, demonstrating organ-specific cell-autonomous function. Aberrant Def expression in adult liver disrupts intrahepatic structural integrity and alters specific functional pathways as shown by microarray analysis.","method":"Transgenic rescue (Tg(fabp10a:def)), zebrafish genetics, histology, microarray gene expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic rescue establishes cell autonomy, single lab, genetic approach with phenotypic readout but limited molecular mechanism for pathway specificity","pmids":["23593122"],"is_preprint":false},{"year":2017,"finding":"Homozygous deletion of mouse Diexf (UTP25/DEF) is embryonic lethal. Unlike Mdm2 and Mdm4 knockouts, loss of p53 does not rescue the Diexf embryonic lethal phenotype. Diexf heterozygous mice are not sensitized to sub-lethal ionizing radiation, indicating Diexf is an essential developmental gene in mammals but is NOT a significant regulator of the p53 pathway during mouse development or in response to ionizing radiation.","method":"Conditional and constitutive knockout mice, p53 double-knockout epistasis, ionizing radiation challenge","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous genetic epistasis in mammalian system; negative result (p53 independence) is itself mechanistically informative and well-controlled","pmids":["29262616"],"is_preprint":false},{"year":2020,"finding":"Conditional knockout of mouse def gene in hepatocytes causes cell morphology abnormalities, chronic inflammatory infiltration, multiple tissue damage foci, and biliary hyperplasia with age. Partial hepatectomy in def conditional knockout mice causes sudden acute death, rescued by pre-treatment with the anti-inflammation drug dexamethasone, demonstrating Def is essential for mammalian liver homeostasis and regeneration capacity.","method":"Conditional hepatocyte-specific knockout mice, partial hepatectomy, pharmacological rescue (dexamethasone), histology","journal":"Science China. Life sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with defined phenotypic readout and pharmacological rescue, extending zebrafish findings to mammalian system","pmids":["32303961"],"is_preprint":false},{"year":2021,"finding":"The nucleolus-localized Def-CAPN3 pathway controls turnover of multiple substrates including p53, SSU processome component Mpp10, and checkpoint proteins Chk1 and Wee1. CAPN3 is recruited by Def from the cytoplasm to the nucleolus; Def depletion excludes CAPN3 and causes accumulation of these substrates in the nucleolus, resulting in cell-cycle arrest and rRNA processing defects. This pathway is Ca2+-dependent and independent of the ubiquitin-proteasome pathway.","method":"Review synthesizing prior Co-IP, genetic depletion, subcellular fractionation, and functional rescue experiments from zebrafish and human cell studies","journal":"Journal of genetics and genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — review article synthesizing multiple prior experimental findings; confidence reduced because this paper itself is a review, not primary data","pmids":["34452850"],"is_preprint":false},{"year":2022,"finding":"An 86-amino acid motif (residues 430–515) in human CAPN3 is essential for its interaction with human Def (hDef). This motif is highly conserved in zebrafish Capn3b and is required for the zDef-zCapn3b interaction. The 2/3 C-terminus of hDef mediates the hDef-hCAPN3 interaction, and the corresponding region is conserved in zebrafish.","method":"Truncation and internal deletion mutagenesis of CAPN3, co-immunoprecipitation, domain mapping of Def","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic domain mapping with multiple truncations, but single lab and single method (Co-IP/deletion)","pmids":["35878425"],"is_preprint":false},{"year":2024,"finding":"DEF binds to p65 (NF-κB subunit) in cancer cells, shielding it from ubiquitin-proteasome-mediated degradation. DEF depletion impedes tumor growth in pancreatic cancer models in vitro and in vivo. A DEF-mimicking peptide (peptide-031) designed to disrupt the DEF-p65 interaction inhibits tumor proliferation in vitro and in vivo.","method":"Co-immunoprecipitation, siRNA knockdown, in vitro and in vivo tumor growth assays, peptide competition, computational modeling","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction shown, functional knockdown with tumor readout and peptide competition; single lab, findings in cancer cells may differ from normal physiology","pmids":["38757623"],"is_preprint":false},{"year":2014,"finding":"miR-195 down-regulates DIEXF (UTP25/DEF) in colon cells; increased miR-195 (as observed in Hirschsprung's disease tissues) suppresses DIEXF levels and impairs cell migration and proliferation in vitro.","method":"miRNA overexpression/inhibition in cell lines, Transwell migration assay, CCK-8 proliferation assay, qRT-PCR/Western blot","journal":"BMC gastroenterology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single miRNA-target relationship established by overexpression only, no direct mechanistic follow-up on how DIEXF mediates migration/proliferation","pmids":["25007945"],"is_preprint":false},{"year":2020,"finding":"An Alu repeat element (AluSq2) with differential DNA methylation located upstream of the DIEXF promoter is associated with DIEXF transcript diversity and protein levels across normal and cancer tissues; alternate epigenetic profiles (DNA methylation and histone modifications) of AluSq2 correlate with DIEXF expression while the CpG island at the DIEXF promoter remains unchanged.","method":"Genome-wide DNA methylation analysis, chromatin immunoprecipitation (histone modifications), correlation of epigenetic state with DIEXF expression across cell types and cancers","journal":"Epigenetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlative epigenetic profiling without direct functional manipulation of the Alu element to establish causality","pmids":["32041475"],"is_preprint":false}],"current_model":"UTP25/DEF/DIEXF encodes a conserved nucleolar protein that serves dual functions: (1) as an SSU processome component required for 18S rRNA maturation (sites A0, A1, A2), and (2) as a scaffold that recruits the cysteine protease CAPN3 from the cytoplasm to the nucleolus, where the resulting Def-CAPN3 complex mediates proteasome-independent, Ca2+-dependent degradation of multiple substrates including p53, Mpp10, Chk1, and Wee1; Def phosphorylation at S87/S92 facilitates nucleolar CAPN3 localization, and an 86-aa motif in CAPN3 (residues 430–515) together with the C-terminal two-thirds of Def mediate their direct interaction; this pathway is essential for digestive organ development in zebrafish and for mammalian liver homeostasis and regeneration, while in mice the embryonic lethality of Diexf deletion is independent of p53."},"narrative":{"mechanistic_narrative":"UTP25 (also DEF/DIEXF) is a conserved nucleolar protein with dual roles: it is a component of the small subunit (SSU) processome required for 18S rRNA maturation, and it serves as a scaffold that recruits the cysteine protease CAPN3 to the nucleolus to drive a proteasome-independent protein degradation pathway [PMID:20884785, PMID:23357851, PMID:27657329]. As an SSU processome subunit, Utp25 associates with U3 snoRNA, Mpp10, and the t-Utp/UtpA, UtpB, and U3 snoRNP subcomplexes, providing inter-subcomplex bridging connections; its depletion blocks pre-18S rRNA cleavage at sites A0, A1, and A2, and in human neuroblastoma cells its loss induces apoptosis [PMID:20884785, PMID:28263972]. The protein directly binds CAPN3 through the C-terminal two-thirds of Def and an 86-residue motif (residues 430–515) in CAPN3, and determines the nucleolar localization of CAPN3, a step potentiated by simultaneous Def phosphorylation at S87 and S92 [PMID:27657329, PMID:35878425]. Within the nucleolus, the Ca2+-dependent, proteasome-independent Def-CAPN3 complex degrades p53 (including several p53 mutants but not p53R175H), the processome component Mpp10, and the checkpoint proteins Chk1 and Wee1, coupling rRNA biogenesis to cell-cycle control [PMID:23357851, PMID:27657329, PMID:34452850]. The pathway is essential for digestive organ development in zebrafish and for mammalian liver homeostasis and regeneration, where Def loss provokes inflammation, fibrosis, and impaired regeneration via a Def–p53–TGFβ axis [PMID:16322560, PMID:24801718, PMID:32303961]. Homozygous Diexf deletion is embryonic lethal in mice, and this lethality is independent of p53, indicating an essential developmental role distinct from p53 regulation [PMID:29262616]. DEF also binds the NF-κB subunit p65 to shield it from proteasomal degradation, a function exploited for tumor growth in pancreatic cancer [PMID:38757623].","teleology":[{"year":2005,"claim":"Established that the gene is a digestive-organ growth factor acting through the p53 pathway, defining its physiological importance before its molecular activity was known.","evidence":"Zebrafish def loss-of-function mutant with p53-pathway epistasis and in situ hybridization","pmids":["16322560"],"confidence":"High","gaps":["Molecular function of Def at the time undefined","How endoderm-restricted expression is achieved unknown","Mechanism linking Def loss to Delta113p53 upregulation not resolved"]},{"year":2010,"claim":"Defined the conserved molecular activity by showing the yeast ortholog is an SSU processome subunit required for 18S rRNA cleavage and providing the first inter-subcomplex connections within the processome.","evidence":"Yeast genetic depletion with Northern rRNA processing analysis, reciprocal Co-IP, two-hybrid, and domain mutagenesis","pmids":["20884785"],"confidence":"High","gaps":["Putative helicase motif Ia found dispensable, leaving catalytic function unclear","Whether processome role connects to the vertebrate p53 phenotype not addressed","No structural model of subcomplex bridging"]},{"year":2013,"claim":"Explained how Def restrains p53 by identifying a novel nucleolar, proteasome-independent degradation pathway mediated by the protease CAPN3, and confirmed cell-autonomous liver function.","evidence":"Zebrafish loss-of-function, subcellular fractionation, proteasome-inhibitor controls, CAPN3 epistasis, and transgenic liver-specific rescue","pmids":["23357851","23593122"],"confidence":"High","gaps":["Direct biochemical demonstration of CAPN3 cleavage of p53 not shown","Basis of organ-specific cell autonomy unexplained","How Def and CAPN3 are brought together unknown"]},{"year":2014,"claim":"Placed Def in a regeneration/fibrosis axis, showing Def–p53 signaling controls inflammatory resolution and scarring through TGFβ and HMGB1.","evidence":"Zebrafish haploinsufficiency with partial hepatectomy, p53 epistasis rescue, and pharmacological TGFβ/anti-inflammatory inhibitors","pmids":["24801718"],"confidence":"High","gaps":["Direct molecular link from Def to HMGB1 not defined","Cell types driving fibrosis not dissected","Relevance to non-hepatic regeneration unclear"]},{"year":2016,"claim":"Resolved the mechanism of CAPN3 recruitment, showing Def binds CAPN3 directly and that phosphorylation at S87/S92 drives nucleolar CAPN3 localization required for p53 degradation and cell-cycle progression.","evidence":"Co-IP, phosphorylation-site mutagenesis with functional readouts, immunofluorescence/fractionation, and zebrafish genetics","pmids":["27657329"],"confidence":"High","gaps":["Kinase responsible for S87/S92 phosphorylation not identified","Why p53R175H is resistant to degradation unexplained","Substrate specificity determinants unknown"]},{"year":2017,"claim":"Extended the processome role to vertebrates and oncogenesis, linking DEF dosage to MYCN-driven pre-rRNA pathway switching and neuroblastoma, and showed mouse Diexf is essential but p53-independent in development.","evidence":"Zebrafish genetics, transgenic neuroblastoma model, siRNA in human cells with pre-rRNA analysis, and knockout mice with p53 double-knockout epistasis and irradiation challenge","pmids":["28263972","29262616"],"confidence":"High","gaps":["The p53-independent essential function in mice is undefined","Mechanism of MYCN-induced pathway switching unresolved","Reconciliation of p53-dependent zebrafish and p53-independent mouse phenotypes incomplete"]},{"year":2020,"claim":"Confirmed the mammalian liver requirement, showing hepatocyte-specific Def loss causes inflammation, biliary hyperplasia, and lethal failure of regeneration after hepatectomy.","evidence":"Conditional hepatocyte knockout mice with partial hepatectomy and dexamethasone rescue","pmids":["32303961"],"confidence":"High","gaps":["Whether the liver phenotype depends on the CAPN3 or processome activity not separated","Molecular drivers of biliary hyperplasia unknown"]},{"year":2021,"claim":"Generalized the Def-CAPN3 pathway beyond p53, defining it as a Ca2+-dependent, proteasome-independent nucleolar turnover system for Mpp10, Chk1, and Wee1.","evidence":"Review synthesizing prior Co-IP, depletion, fractionation, and rescue data","pmids":["34452850"],"confidence":"Medium","gaps":["Review, not new primary data","Direct cleavage of Chk1/Wee1/Mpp10 by CAPN3 not biochemically shown","How substrate selection is regulated unknown"]},{"year":2022,"claim":"Mapped the physical interface, identifying the CAPN3 residue 430–515 motif and the C-terminal two-thirds of Def as the interaction determinants conserved from fish to human.","evidence":"Truncation/internal-deletion mutagenesis and Co-IP domain mapping","pmids":["35878425"],"confidence":"Medium","gaps":["Single method (Co-IP/deletion) without structural validation","Affinity and stoichiometry of the interaction not quantified"]},{"year":2024,"claim":"Identified a CAPN3-independent function, showing DEF binds p65 to protect it from proteasomal degradation and promote tumor growth, with a disruptive peptide as a therapeutic strategy.","evidence":"Reciprocal Co-IP, siRNA knockdown, in vitro/in vivo tumor assays, and peptide competition with modeling","pmids":["38757623"],"confidence":"Medium","gaps":["Single lab; relevance to normal physiology unclear","Whether p65 binding occurs in nucleolus or cytoplasm not defined","Relationship to the processome and CAPN3 functions unresolved"]},{"year":null,"claim":"The p53-independent essential developmental function in mammals and the biochemical basis of CAPN3 substrate selection remain the central unresolved questions.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct reconstitution of CAPN3-mediated substrate cleavage","Kinase controlling Def S87/S92 phosphorylation unidentified","Mechanism uniting rRNA processing, protein degradation, and developmental essentiality unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,9,10]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[2,11]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0,2,3,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,3,9]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,9]}],"complexes":["SSU processome"],"partners":["CAPN3","MPP10","P53","RELA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q68CQ4","full_name":"U3 small nucleolar RNA-associated protein 25 homolog","aliases":["Digestive organ expansion factor homolog","UTP25 small subunit processor component"],"length_aa":756,"mass_kda":87.1,"function":"Component of the ribosomal small subunit processome for the biogenesis of ribosomes, functions in pre-ribosomal RNA (pre-rRNA) processing (By similarity). Essential for embryonic development in part through the regulation of p53 pathway. Controls the expansion growth of digestive organs and liver (PubMed:23357851, PubMed:25007945, PubMed:27657329). Also involved in the sympathetic neuronal development (By similarity). Mediates, with CAPN3, the proteasome-independent degradation of p53/TP53 (PubMed:23357851, PubMed:27657329)","subcellular_location":"Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/Q68CQ4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/UTP25","classification":"Common Essential","n_dependent_lines":1081,"n_total_lines":1208,"dependency_fraction":0.8948675496688742},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"IMP3","stoichiometry":0.2},{"gene":"MAPKAPK3","stoichiometry":0.2},{"gene":"MPHOSPH10","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/UTP25","total_profiled":1310},"omim":[{"mim_id":"619663","title":"UTP25 SMALL SUBUNIT PROCESSOR COMPONENT; UTP25","url":"https://www.omim.org/entry/619663"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/UTP25"},"hgnc":{"alias_symbol":["MGC29875","DEF"],"prev_symbol":["C1orf107","DIEXF"]},"alphafold":{"accession":"Q68CQ4","domains":[{"cath_id":"3.40.50.300","chopping":"210-264_274-336_349-402_411-560","consensus_level":"medium","plddt":91.0511,"start":210,"end":560},{"cath_id":"3.40.50.300","chopping":"568-754","consensus_level":"high","plddt":92.429,"start":568,"end":754}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q68CQ4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q68CQ4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q68CQ4-F1-predicted_aligned_error_v6.png","plddt_mean":77.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=UTP25","jax_strain_url":"https://www.jax.org/strain/search?query=UTP25"},"sequence":{"accession":"Q68CQ4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q68CQ4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q68CQ4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q68CQ4"}},"corpus_meta":[{"pmid":"20385094","id":"PMC_20385094","title":"ERK2 but not ERK1 induces epithelial-to-mesenchymal transformation via DEF motif-dependent signaling events.","date":"2010","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/20385094","citation_count":261,"is_preprint":false},{"pmid":"16322560","id":"PMC_16322560","title":"Loss of function of def selectively up-regulates Delta113p53 expression to arrest expansion growth of digestive organs in zebrafish.","date":"2005","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/16322560","citation_count":157,"is_preprint":false},{"pmid":"22935520","id":"PMC_22935520","title":"Polycyclic aromatic hydrocarbons as skin carcinogens: comparison of benzo[a]pyrene, dibenzo[def,p]chrysene and three environmental mixtures in the FVB/N mouse.","date":"2012","source":"Toxicology and applied pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/22935520","citation_count":112,"is_preprint":false},{"pmid":"15295066","id":"PMC_15295066","title":"Four DEF-like MADS box genes displayed distinct floral morphogenetic roles in Phalaenopsis orchid.","date":"2004","source":"Plant & cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/15295066","citation_count":110,"is_preprint":false},{"pmid":"16844905","id":"PMC_16844905","title":"Analysis of the Petunia TM6 MADS box gene reveals functional divergence within the DEF/AP3 lineage.","date":"2006","source":"The Plant cell","url":"https://pubmed.ncbi.nlm.nih.gov/16844905","citation_count":104,"is_preprint":false},{"pmid":"11773070","id":"PMC_11773070","title":"DEF-1/ASAP1 is a GTPase-activating protein (GAP) for ARF1 that enhances cell motility through a GAP-dependent mechanism.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11773070","citation_count":81,"is_preprint":false},{"pmid":"18763023","id":"PMC_18763023","title":"Development of 3D PPF/DEF scaffolds using micro-stereolithography and surface modification.","date":"2008","source":"Journal of materials science. Materials in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/18763023","citation_count":66,"is_preprint":false},{"pmid":"23696005","id":"PMC_23696005","title":"Ribosome profiling: a Hi-Def monitor for protein synthesis at the genome-wide scale.","date":"2013","source":"Wiley interdisciplinary reviews. RNA","url":"https://pubmed.ncbi.nlm.nih.gov/23696005","citation_count":64,"is_preprint":false},{"pmid":"10528265","id":"PMC_10528265","title":"A DEF/GLO-like MADS-box gene from a gymnosperm: Pinus radiata contains an ortholog of angiosperm B class floral homeotic genes.","date":"1999","source":"Developmental genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10528265","citation_count":63,"is_preprint":false},{"pmid":"23357851","id":"PMC_23357851","title":"Def defines a conserved nucleolar pathway that leads p53 to proteasome-independent degradation.","date":"2013","source":"Cell research","url":"https://pubmed.ncbi.nlm.nih.gov/23357851","citation_count":59,"is_preprint":false},{"pmid":"18160653","id":"PMC_18160653","title":"A TAT-DEF-Elk-1 peptide regulates the cytonuclear trafficking of Elk-1 and controls cytoskeleton dynamics.","date":"2007","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18160653","citation_count":58,"is_preprint":false},{"pmid":"10460589","id":"PMC_10460589","title":"Def-2, -3, -6 and -8, novel mouse genes differentially expressed in the haemopoietic system.","date":"1999","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/10460589","citation_count":51,"is_preprint":false},{"pmid":"22983125","id":"PMC_22983125","title":"Sirt1: def-eating senescence?","date":"2012","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/22983125","citation_count":49,"is_preprint":false},{"pmid":"7937069","id":"PMC_7937069","title":"The DEF data base of sequence based protein fold class predictions.","date":"1994","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/7937069","citation_count":49,"is_preprint":false},{"pmid":"20884785","id":"PMC_20884785","title":"The DEAD-box RNA helicase-like Utp25 is an SSU processome component.","date":"2010","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/20884785","citation_count":44,"is_preprint":false},{"pmid":"15728578","id":"PMC_15728578","title":"Identification of a DEF-type docking domain for extracellular signal-regulated kinases 1/2 that directs phosphorylation and turnover of the BH3-only protein BimEL.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15728578","citation_count":42,"is_preprint":false},{"pmid":"10353602","id":"PMC_10353602","title":"DEF-3(g16/NY-LU-12), an RNA binding protein from the 3p21.3 homozygous deletion region in SCLC.","date":"1999","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/10353602","citation_count":41,"is_preprint":false},{"pmid":"24902716","id":"PMC_24902716","title":"DEF- and GLO-like proteins may have lost most of their interaction partners during angiosperm evolution.","date":"2014","source":"Annals of 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B, Biology","url":"https://pubmed.ncbi.nlm.nih.gov/10739145","citation_count":4,"is_preprint":false},{"pmid":"38405470","id":"PMC_38405470","title":"Gender Difference in DNA Damage Induced by the Environmental Carcinogen Dibenzo[def,p]chrysene Individually and in Combination with Mouse Papillomavirus Infection in the Mouse Oral Cavity.","date":"2024","source":"ACS omega","url":"https://pubmed.ncbi.nlm.nih.gov/38405470","citation_count":3,"is_preprint":false},{"pmid":"27480381","id":"PMC_27480381","title":"DeF-GPU: Efficient and effective deletions finding in hepatitis B viral genomic DNA using a GPU architecture.","date":"2016","source":"Methods (San Diego, Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/27480381","citation_count":3,"is_preprint":false},{"pmid":"29375608","id":"PMC_29375608","title":"Long-lasting Corolla Cultivars in Japanese Azaleas: A Mutant AP3/DEF Homolog Identified in Traditional Azalea Cultivars from More Than 300 Years Ago.","date":"2018","source":"Frontiers in plant science","url":"https://pubmed.ncbi.nlm.nih.gov/29375608","citation_count":3,"is_preprint":false},{"pmid":"31838185","id":"PMC_31838185","title":"The effect of inhibitors of phosphatidylinositol 3-kinase-related kinases on dibenzo[def,p]chrysene genotoxicity measured by γH2AX levels and neutral comet assay in HepG2 human hepatocellular cancer cells.","date":"2019","source":"Toxicology in vitro : an international journal published in association with BIBRA","url":"https://pubmed.ncbi.nlm.nih.gov/31838185","citation_count":2,"is_preprint":false},{"pmid":"35878425","id":"PMC_35878425","title":"An 86 amino acids motif in CAPN3 is essential for formation of the nucleolus-localized Def-CAPN3 complex.","date":"2022","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/35878425","citation_count":2,"is_preprint":false},{"pmid":"39604478","id":"PMC_39604478","title":"Metabolic reprogramming in saliva of mice treated with the environmental and tobacco carcinogen dibenzo[def, p]chrysene.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39604478","citation_count":2,"is_preprint":false},{"pmid":"22078070","id":"PMC_22078070","title":"Growth, seed development and genetic analysis in wild type and Def mutant of Pisum sativum L.","date":"2011","source":"BMC research notes","url":"https://pubmed.ncbi.nlm.nih.gov/22078070","citation_count":2,"is_preprint":false},{"pmid":"10328754","id":"PMC_10328754","title":"Metabolic activation of 4H-cyclopenta[def]chrysene in human mammary carcinoma MCF-7 cell cultures.","date":"1999","source":"Chemical research in toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/10328754","citation_count":2,"is_preprint":false},{"pmid":"38819167","id":"PMC_38819167","title":"Azole resistance screening in Aspergillus fumigatus sensu stricto using the azole-containing agar method (EUCAST E.Def 10.2): conidial suspension filtration and inoculum adjustment before inoculum preparation may not be needed.","date":"2024","source":"Journal of clinical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/38819167","citation_count":2,"is_preprint":false},{"pmid":"35796747","id":"PMC_35796747","title":"Screening of azole resistance in Aspergillus fumigatus using the EUCAST E.Def 10.2 azole-containing agar method: a single study suggests that filtration of conidial suspensions prior to inoculum preparation may not be needed.","date":"2022","source":"Mycoses","url":"https://pubmed.ncbi.nlm.nih.gov/35796747","citation_count":2,"is_preprint":false},{"pmid":"24460299","id":"PMC_24460299","title":"Fused polypeptide with DEF induces apoptosis of lung adenocarcinoma cells.","date":"2013","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/24460299","citation_count":2,"is_preprint":false},{"pmid":"39343789","id":"PMC_39343789","title":"Host miRNA and mRNA profiles during in DEF and duck after DHAV-1 infection.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39343789","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51744,"output_tokens":4288,"usd":0.109776,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11817,"output_tokens":3784,"usd":0.076842,"stage2_stop_reason":"end_turn"},"total_usd":0.186618,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about the canonical UTP25/DEF/DIEXF protein (a nucleolar factor involved in ribosome biogenesis and p53 regulation, originally identified in zebrafish as digestive organ expansion factor). I'll filter out papers about DEF motifs in MAP kinase signaling, plant DEFICIENS MADS-box genes, polycyclic aromatic hydrocarbons, bacterial lexA/def genes, duck embryo fibroblast (DEF) cell lines, and other symbol collisions.\n\nRelevant papers: [15] (yeast Utp25/SSU processome), [2] (zebrafish def/p53), [10] (Def nucleolar p53 degradation), [23] (Def phosphorylation/CAPN3), [26] (DEF/pre-rRNA processing/neuroblastoma), [30] (Def-p53 pathway/liver regeneration), [52] (DEF/UTP25 liver homeostasis), [62] (Def cell-autonomous in organogenesis), [63] (Diexf knockout mice), [68] (Def-CAPN3 pathway review), [79] (DIEXF epigenetic regulation), [82] (DEF-p65 interaction/pancreatic cancer), [93] (CAPN3 motif for Def interaction), [34] (miR-195/DIEXF/Hirschsprung's).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"Yeast Utp25 (YIL091C) is a component of the SSU processome; genetic depletion causes 18S rRNA maturation defects at sites A0, A1, and A2. Co-immunoprecipitation confirmed association with U3 snoRNA, Mpp10, and components of t-Utp/UtpA, UtpB, and U3 snoRNP subcomplexes. Two-hybrid screening identified interactions with Mpp10, Utp3, and Utp21, providing the first inter-subcomplex connections within the SSU processome. The C-terminal DUF1253 domain is required and sufficient for interaction with Utp3. Mutation of conserved motif Ia residues produced no growth defect, indicating this putative helicase motif is dispensable for function.\",\n      \"method\": \"Genetic depletion + Northern analysis, co-immunoprecipitation, yeast two-hybrid, domain truncation/mutagenesis\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (genetic depletion with rRNA processing assay, reciprocal Co-IP, two-hybrid, domain mutagenesis) in a single focused study\",\n      \"pmids\": [\"20884785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Zebrafish def (digestive organ expansion factor) encodes a pan-endoderm-specific nuclear factor required for digestive organ growth. Loss-of-function of def selectively upregulates Delta113p53 expression within mutant digestive organs, triggering p53-responsive cell-cycle arrest (but not apoptosis), resulting in hypoplastic organs.\",\n      \"method\": \"Zebrafish loss-of-function mutant (defhi429), genetic epistasis with p53 pathway, in situ hybridization, cell-cycle analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function mutant with specific molecular phenotype (selective Delta113p53 upregulation, cell-cycle arrest), replicated across multiple assays in a focused study\",\n      \"pmids\": [\"16322560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Def is a nucleolar protein; loss of def causes p53 protein to accumulate in nucleoli. Def mediates proteasome-independent degradation of p53 through the cysteine protease Calpain3 (CAPN3). This defines a novel nucleolar protein degradation pathway for p53 turnover.\",\n      \"method\": \"Zebrafish loss-of-function, subcellular fractionation/immunofluorescence, proteasome inhibitor controls, genetic epistasis with CAPN3, overexpression rescue\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments, functional epistasis with CAPN3, proteasome-independence demonstrated with inhibitors, multiple orthogonal approaches in one focused study\",\n      \"pmids\": [\"23357851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Def directly interacts with CAPN3 in the nucleolus and determines nucleolar localization of CAPN3, which is a prerequisite for p53 degradation there. Def is phosphorylated at five serine residues (S50, S58, S62, S87, S92); simultaneous phosphorylation at S87 and S92 facilitates nucleolar localization of CAPN3, which is essential for p53 degradation and cell-cycle progression. CAPN3 degrades wild-type p53 and mutants p53A138V, p53M237I, p53R248W, and p53R273P, but not p53R175H.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of phosphorylation sites, subcellular localization (immunofluorescence/fractionation), zebrafish genetics, cell-cycle analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct protein interaction, phosphorylation site mutagenesis with functional readouts, localization experiments with functional consequence, multiple orthogonal methods\",\n      \"pmids\": [\"27657329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DEF functions in pre-rRNA processing as an SSU processome component in vivo. def-deficient zebrafish show underdeveloped peripheral sympathetic nervous system; def haploinsufficiency reduces disease penetrance and tumor growth in a MYCN-driven transgenic neuroblastoma model. MYCN overexpression shifts pre-rRNA processing from Pathway 1 to Pathway 2 (different temporal order of cleavages), and DEF depletion in human neuroblastoma cell lines induces apoptosis.\",\n      \"method\": \"Zebrafish loss-of-function genetics, transgenic neuroblastoma model, siRNA knockdown in human cell lines, Northern/pre-rRNA processing analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic models with specific molecular readouts (rRNA pathway switching, apoptosis upon knockdown), replicated across zebrafish and human cell lines\",\n      \"pmids\": [\"28263972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Zebrafish def haploinsufficiency activates a p53-dependent TGFβ signaling pathway after partial hepatectomy, resulting in prolonged inflammatory response, impaired leukocyte clearance, and fibrotic scar formation at the amputation site. This phenotype was rescued by Def overexpression, p53 loss-of-function, anti-inflammatory dexamethasone, or TGFβ inhibitor SB431542. Def-p53 pathway suppresses fibrosis at least in part through regulation of HMGB1 (high-mobility group box 1).\",\n      \"method\": \"Zebrafish genetics (haploinsufficiency model), partial hepatectomy, genetic epistasis (p53 loss-of-function rescue), pharmacological inhibitors, molecular pathway analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological epistasis experiments with specific molecular pathway placement (Def → p53 → TGFβ → fibrosis), rescue experiments provide mechanistic validation\",\n      \"pmids\": [\"24801718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Def functions cell-autonomously during liver development; transgenic liver-specific Def overexpression restores liver but not exocrine pancreas or intestine development in def mutant zebrafish, demonstrating organ-specific cell-autonomous function. Aberrant Def expression in adult liver disrupts intrahepatic structural integrity and alters specific functional pathways as shown by microarray analysis.\",\n      \"method\": \"Transgenic rescue (Tg(fabp10a:def)), zebrafish genetics, histology, microarray gene expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic rescue establishes cell autonomy, single lab, genetic approach with phenotypic readout but limited molecular mechanism for pathway specificity\",\n      \"pmids\": [\"23593122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Homozygous deletion of mouse Diexf (UTP25/DEF) is embryonic lethal. Unlike Mdm2 and Mdm4 knockouts, loss of p53 does not rescue the Diexf embryonic lethal phenotype. Diexf heterozygous mice are not sensitized to sub-lethal ionizing radiation, indicating Diexf is an essential developmental gene in mammals but is NOT a significant regulator of the p53 pathway during mouse development or in response to ionizing radiation.\",\n      \"method\": \"Conditional and constitutive knockout mice, p53 double-knockout epistasis, ionizing radiation challenge\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous genetic epistasis in mammalian system; negative result (p53 independence) is itself mechanistically informative and well-controlled\",\n      \"pmids\": [\"29262616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Conditional knockout of mouse def gene in hepatocytes causes cell morphology abnormalities, chronic inflammatory infiltration, multiple tissue damage foci, and biliary hyperplasia with age. Partial hepatectomy in def conditional knockout mice causes sudden acute death, rescued by pre-treatment with the anti-inflammation drug dexamethasone, demonstrating Def is essential for mammalian liver homeostasis and regeneration capacity.\",\n      \"method\": \"Conditional hepatocyte-specific knockout mice, partial hepatectomy, pharmacological rescue (dexamethasone), histology\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with defined phenotypic readout and pharmacological rescue, extending zebrafish findings to mammalian system\",\n      \"pmids\": [\"32303961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The nucleolus-localized Def-CAPN3 pathway controls turnover of multiple substrates including p53, SSU processome component Mpp10, and checkpoint proteins Chk1 and Wee1. CAPN3 is recruited by Def from the cytoplasm to the nucleolus; Def depletion excludes CAPN3 and causes accumulation of these substrates in the nucleolus, resulting in cell-cycle arrest and rRNA processing defects. This pathway is Ca2+-dependent and independent of the ubiquitin-proteasome pathway.\",\n      \"method\": \"Review synthesizing prior Co-IP, genetic depletion, subcellular fractionation, and functional rescue experiments from zebrafish and human cell studies\",\n      \"journal\": \"Journal of genetics and genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — review article synthesizing multiple prior experimental findings; confidence reduced because this paper itself is a review, not primary data\",\n      \"pmids\": [\"34452850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"An 86-amino acid motif (residues 430–515) in human CAPN3 is essential for its interaction with human Def (hDef). This motif is highly conserved in zebrafish Capn3b and is required for the zDef-zCapn3b interaction. The 2/3 C-terminus of hDef mediates the hDef-hCAPN3 interaction, and the corresponding region is conserved in zebrafish.\",\n      \"method\": \"Truncation and internal deletion mutagenesis of CAPN3, co-immunoprecipitation, domain mapping of Def\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic domain mapping with multiple truncations, but single lab and single method (Co-IP/deletion)\",\n      \"pmids\": [\"35878425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DEF binds to p65 (NF-κB subunit) in cancer cells, shielding it from ubiquitin-proteasome-mediated degradation. DEF depletion impedes tumor growth in pancreatic cancer models in vitro and in vivo. A DEF-mimicking peptide (peptide-031) designed to disrupt the DEF-p65 interaction inhibits tumor proliferation in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, in vitro and in vivo tumor growth assays, peptide competition, computational modeling\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction shown, functional knockdown with tumor readout and peptide competition; single lab, findings in cancer cells may differ from normal physiology\",\n      \"pmids\": [\"38757623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-195 down-regulates DIEXF (UTP25/DEF) in colon cells; increased miR-195 (as observed in Hirschsprung's disease tissues) suppresses DIEXF levels and impairs cell migration and proliferation in vitro.\",\n      \"method\": \"miRNA overexpression/inhibition in cell lines, Transwell migration assay, CCK-8 proliferation assay, qRT-PCR/Western blot\",\n      \"journal\": \"BMC gastroenterology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single miRNA-target relationship established by overexpression only, no direct mechanistic follow-up on how DIEXF mediates migration/proliferation\",\n      \"pmids\": [\"25007945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"An Alu repeat element (AluSq2) with differential DNA methylation located upstream of the DIEXF promoter is associated with DIEXF transcript diversity and protein levels across normal and cancer tissues; alternate epigenetic profiles (DNA methylation and histone modifications) of AluSq2 correlate with DIEXF expression while the CpG island at the DIEXF promoter remains unchanged.\",\n      \"method\": \"Genome-wide DNA methylation analysis, chromatin immunoprecipitation (histone modifications), correlation of epigenetic state with DIEXF expression across cell types and cancers\",\n      \"journal\": \"Epigenetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlative epigenetic profiling without direct functional manipulation of the Alu element to establish causality\",\n      \"pmids\": [\"32041475\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UTP25/DEF/DIEXF encodes a conserved nucleolar protein that serves dual functions: (1) as an SSU processome component required for 18S rRNA maturation (sites A0, A1, A2), and (2) as a scaffold that recruits the cysteine protease CAPN3 from the cytoplasm to the nucleolus, where the resulting Def-CAPN3 complex mediates proteasome-independent, Ca2+-dependent degradation of multiple substrates including p53, Mpp10, Chk1, and Wee1; Def phosphorylation at S87/S92 facilitates nucleolar CAPN3 localization, and an 86-aa motif in CAPN3 (residues 430–515) together with the C-terminal two-thirds of Def mediate their direct interaction; this pathway is essential for digestive organ development in zebrafish and for mammalian liver homeostasis and regeneration, while in mice the embryonic lethality of Diexf deletion is independent of p53.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"UTP25 (also DEF/DIEXF) is a conserved nucleolar protein with dual roles: it is a component of the small subunit (SSU) processome required for 18S rRNA maturation, and it serves as a scaffold that recruits the cysteine protease CAPN3 to the nucleolus to drive a proteasome-independent protein degradation pathway [#0, #2, #3]. As an SSU processome subunit, Utp25 associates with U3 snoRNA, Mpp10, and the t-Utp/UtpA, UtpB, and U3 snoRNP subcomplexes, providing inter-subcomplex bridging connections; its depletion blocks pre-18S rRNA cleavage at sites A0, A1, and A2, and in human neuroblastoma cells its loss induces apoptosis [#0, #4]. The protein directly binds CAPN3 through the C-terminal two-thirds of Def and an 86-residue motif (residues 430–515) in CAPN3, and determines the nucleolar localization of CAPN3, a step potentiated by simultaneous Def phosphorylation at S87 and S92 [#3, #10]. Within the nucleolus, the Ca2+-dependent, proteasome-independent Def-CAPN3 complex degrades p53 (including several p53 mutants but not p53R175H), the processome component Mpp10, and the checkpoint proteins Chk1 and Wee1, coupling rRNA biogenesis to cell-cycle control [#2, #3, #9]. The pathway is essential for digestive organ development in zebrafish and for mammalian liver homeostasis and regeneration, where Def loss provokes inflammation, fibrosis, and impaired regeneration via a Def–p53–TGFβ axis [#1, #5, #8]. Homozygous Diexf deletion is embryonic lethal in mice, and this lethality is independent of p53, indicating an essential developmental role distinct from p53 regulation [#7]. DEF also binds the NF-κB subunit p65 to shield it from proteasomal degradation, a function exploited for tumor growth in pancreatic cancer [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that the gene is a digestive-organ growth factor acting through the p53 pathway, defining its physiological importance before its molecular activity was known.\",\n      \"evidence\": \"Zebrafish def loss-of-function mutant with p53-pathway epistasis and in situ hybridization\",\n      \"pmids\": [\"16322560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular function of Def at the time undefined\", \"How endoderm-restricted expression is achieved unknown\", \"Mechanism linking Def loss to Delta113p53 upregulation not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the conserved molecular activity by showing the yeast ortholog is an SSU processome subunit required for 18S rRNA cleavage and providing the first inter-subcomplex connections within the processome.\",\n      \"evidence\": \"Yeast genetic depletion with Northern rRNA processing analysis, reciprocal Co-IP, two-hybrid, and domain mutagenesis\",\n      \"pmids\": [\"20884785\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Putative helicase motif Ia found dispensable, leaving catalytic function unclear\", \"Whether processome role connects to the vertebrate p53 phenotype not addressed\", \"No structural model of subcomplex bridging\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Explained how Def restrains p53 by identifying a novel nucleolar, proteasome-independent degradation pathway mediated by the protease CAPN3, and confirmed cell-autonomous liver function.\",\n      \"evidence\": \"Zebrafish loss-of-function, subcellular fractionation, proteasome-inhibitor controls, CAPN3 epistasis, and transgenic liver-specific rescue\",\n      \"pmids\": [\"23357851\", \"23593122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical demonstration of CAPN3 cleavage of p53 not shown\", \"Basis of organ-specific cell autonomy unexplained\", \"How Def and CAPN3 are brought together unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed Def in a regeneration/fibrosis axis, showing Def–p53 signaling controls inflammatory resolution and scarring through TGFβ and HMGB1.\",\n      \"evidence\": \"Zebrafish haploinsufficiency with partial hepatectomy, p53 epistasis rescue, and pharmacological TGFβ/anti-inflammatory inhibitors\",\n      \"pmids\": [\"24801718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link from Def to HMGB1 not defined\", \"Cell types driving fibrosis not dissected\", \"Relevance to non-hepatic regeneration unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved the mechanism of CAPN3 recruitment, showing Def binds CAPN3 directly and that phosphorylation at S87/S92 drives nucleolar CAPN3 localization required for p53 degradation and cell-cycle progression.\",\n      \"evidence\": \"Co-IP, phosphorylation-site mutagenesis with functional readouts, immunofluorescence/fractionation, and zebrafish genetics\",\n      \"pmids\": [\"27657329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for S87/S92 phosphorylation not identified\", \"Why p53R175H is resistant to degradation unexplained\", \"Substrate specificity determinants unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the processome role to vertebrates and oncogenesis, linking DEF dosage to MYCN-driven pre-rRNA pathway switching and neuroblastoma, and showed mouse Diexf is essential but p53-independent in development.\",\n      \"evidence\": \"Zebrafish genetics, transgenic neuroblastoma model, siRNA in human cells with pre-rRNA analysis, and knockout mice with p53 double-knockout epistasis and irradiation challenge\",\n      \"pmids\": [\"28263972\", \"29262616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The p53-independent essential function in mice is undefined\", \"Mechanism of MYCN-induced pathway switching unresolved\", \"Reconciliation of p53-dependent zebrafish and p53-independent mouse phenotypes incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Confirmed the mammalian liver requirement, showing hepatocyte-specific Def loss causes inflammation, biliary hyperplasia, and lethal failure of regeneration after hepatectomy.\",\n      \"evidence\": \"Conditional hepatocyte knockout mice with partial hepatectomy and dexamethasone rescue\",\n      \"pmids\": [\"32303961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the liver phenotype depends on the CAPN3 or processome activity not separated\", \"Molecular drivers of biliary hyperplasia unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Generalized the Def-CAPN3 pathway beyond p53, defining it as a Ca2+-dependent, proteasome-independent nucleolar turnover system for Mpp10, Chk1, and Wee1.\",\n      \"evidence\": \"Review synthesizing prior Co-IP, depletion, fractionation, and rescue data\",\n      \"pmids\": [\"34452850\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review, not new primary data\", \"Direct cleavage of Chk1/Wee1/Mpp10 by CAPN3 not biochemically shown\", \"How substrate selection is regulated unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped the physical interface, identifying the CAPN3 residue 430–515 motif and the C-terminal two-thirds of Def as the interaction determinants conserved from fish to human.\",\n      \"evidence\": \"Truncation/internal-deletion mutagenesis and Co-IP domain mapping\",\n      \"pmids\": [\"35878425\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method (Co-IP/deletion) without structural validation\", \"Affinity and stoichiometry of the interaction not quantified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a CAPN3-independent function, showing DEF binds p65 to protect it from proteasomal degradation and promote tumor growth, with a disruptive peptide as a therapeutic strategy.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA knockdown, in vitro/in vivo tumor assays, and peptide competition with modeling\",\n      \"pmids\": [\"38757623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; relevance to normal physiology unclear\", \"Whether p65 binding occurs in nucleolus or cytoplasm not defined\", \"Relationship to the processome and CAPN3 functions unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The p53-independent essential developmental function in mammals and the biochemical basis of CAPN3 substrate selection remain the central unresolved questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct reconstitution of CAPN3-mediated substrate cleavage\", \"Kinase controlling Def S87/S92 phosphorylation unidentified\", \"Mechanism uniting rRNA processing, protein degradation, and developmental essentiality unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 9, 10]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [2, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0, 2, 3, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 3, 9]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 9]}\n    ],\n    \"complexes\": [\"SSU processome\"],\n    \"partners\": [\"CAPN3\", \"MPP10\", \"p53\", \"RELA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}