{"gene":"EXOSC10","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1999,"finding":"Human EXOSC10 (PM/Scl-100/RRP6) was identified as a component of the human PM-Scl complex, which is the functional equivalent of the yeast exosome. The nuclear form of the complex in both yeast and humans contains Rrp6p/PM-Scl100 exclusively, distinguishing the nuclear from cytoplasmic exosome. Human homologs complemented mutations in respective yeast exosome genes.","method":"Biochemical fractionation, indirect immunofluorescence, genetic complementation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — reciprocal biochemical fractionation plus genetic complementation in yeast, replicated across organisms","pmids":["10465791"],"is_preprint":false},{"year":2001,"finding":"PM/Scl100 (EXOSC10) was identified as a component of the human exosome required for rapid degradation of ARE-containing mRNAs. AU-rich element binding proteins recruit the exosome (including PM/Scl100) to unstable RNAs to promote their degradation. The mammalian exosome was purified and characterized by mass spectrometry.","method":"Mass spectrometry, cell-free RNA decay assay, immunoprecipitation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstituted decay system with purified complex, mass spectrometry identification","pmids":["11719186"],"is_preprint":false},{"year":2003,"finding":"Downregulating PM/Scl100 (EXOSC10) significantly increases the abundance of nonsense-containing mRNAs and slows their decay rate, demonstrating its role in nonsense-mediated mRNA decay (NMD). NMD factors Upf1, Upf2, and Upf3X co-immunopurify with PM/Scl100 and other exosomal components, linking EXOSC10 to both 3'→5' degradation and the NMD pathway.","method":"RNAi knockdown, mRNA decay rate assay, co-immunoprecipitation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — functional knockdown with defined decay phenotype plus co-IP linking EXOSC10 to NMD machinery","pmids":["14527413"],"is_preprint":false},{"year":2006,"finding":"The crystal structure of yeast Rrp6p (ortholog of EXOSC10) reveals a conserved RNase D core with an HRDC domain in an unusual conformation important for RNA processing. Co-crystals with AMP and UMP products reveal how the protein specifically recognizes ribonucleotides. In vivo mutational studies show domain contacts are critical for the processing function, highlighting differences from prokaryotic RNase D counterparts.","method":"X-ray crystallography, in vitro exonuclease assay, in vivo mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with product-bound complexes validated by in vivo mutagenesis","pmids":["16882719"],"is_preprint":false},{"year":2006,"finding":"Reconstitution of 9-, 10-, and 11-subunit eukaryotic exosomes established that human Rrp41/Rrp45 has processive phosphorolytic activity, yeast Rrp44 has processive hydrolytic activity, and Rrp6 (EXOSC10 ortholog) has distributive hydrolytic 3'→5' exoribonuclease activity. The 3.35 Å X-ray structure of the 9-subunit human exosome was also determined, revealing the conserved architecture.","method":"In vitro reconstitution, exonuclease assays with multiple RNA substrates, X-ray crystallography","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — full reconstitution plus structure, defining catalytic mechanism of Rrp6/EXOSC10","pmids":["17174896"],"is_preprint":false},{"year":2008,"finding":"Rrp6p (EXOSC10 ortholog) can carry out some RNA 3'-end processing functions (5.8S rRNA, snoRNAs) and degrade certain rRNA intermediates independently of physical association with the core exosome. However, Rrp6p–core exosome interaction is required for efficient degradation of poly(A)+ rRNA processing products that require combined activities of Dis3p and Rrp6p.","method":"Truncation mutants, co-purification assays, in vivo RNA analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — defined molecular separation of core-dependent vs. independent Rrp6 functions in yeast ortholog","pmids":["18940861"],"is_preprint":false},{"year":2008,"finding":"Depletion of the RNA exosome (including its nuclear component equivalent to EXOSC10) from human cells revealed a class of short, polyadenylated, highly unstable promoter upstream transcripts (PROMPTs) produced ~0.5–2.5 kb upstream of active transcription start sites, demonstrating that EXOSC10/exosome normally degrades these bidirectional transcripts.","method":"siRNA depletion, tiling microarray, nuclear RNA analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — exosome depletion in human cells with genome-wide substrate identification","pmids":["19056938"],"is_preprint":false},{"year":2009,"finding":"The TRAMP complex enhances RNA degradation by the nuclear exosome specifically through stimulation of Rrp6 (EXOSC10 ortholog) activity. Purified TRAMP incubated with recombinant Rrp6 results in a 10-fold enhancement of RNA degradation rate via the hydrolytic activity of Rrp6; an Rrp6 active-site mutant abolishes this enhancement. This enhancement is independent of TRAMP's poly(A) polymerase or helicase activities.","method":"In vitro reconstituted RNA degradation assay with purified components, active-site mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with purified TRAMP and recombinant Rrp6, validated with active-site mutant","pmids":["19955569"],"is_preprint":false},{"year":2011,"finding":"Human RRP6 (EXOSC10/PM-Scl100) was characterized biochemically; full-length enzyme and truncation mutants retaining catalytic activity were expressed, and the X-ray structure of the human RRP6 exoribonuclease and HRDC domain was determined. Human RRP6 degrades structured RNA substrates more effectively than yeast Rrp6 due to a more exposed active site. Human RRP6 catalyzes distributive 3'→5' exoribonuclease activity on nuclear transcripts including ribosomal RNA precursors.","method":"X-ray crystallography, in vitro exonuclease assays, truncation mutagenesis","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — crystal structure of human EXOSC10 with biochemical activity validation and comparative mutagenesis","pmids":["21705430"],"is_preprint":false},{"year":2011,"finding":"The RNA exosome (with EXOSC10 contributing to both strands access) associates with AID (activation-induced cytidine deaminase) in B cells activated for class switch recombination. The exosome complex accumulates on IgH switch regions in an AID-dependent fashion and is required for optimal class switch recombination. A recombinant RNA exosome core complex imparts robust AID- and transcription-dependent DNA deamination of both strands in vitro, revealing a role for the exosome in targeting AID to template DNA strand.","method":"Co-immunoprecipitation, ChIP, in vitro DNA deamination assay with recombinant exosome, RNAi","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of exosome-AID activity plus ChIP and functional CSR assay in B cells","pmids":["21255825"],"is_preprint":false},{"year":2011,"finding":"Drosophila Rrp6 (ortholog of EXOSC10) is required for cell proliferation and error-free mitosis independently of the core exosome subunit Rrp40. Depletion of dRrp6 increases cell cycle- and mitosis-related transcripts, decreases mitotic frequency, and causes chromosome congression/separation/segregation defects. dRrp6 dynamically redistributes to condensed chromosomes during mitosis, while core subunits localize to microtubules.","method":"RNAi knockdown in S2 cells, microarray, live-cell imaging, phospho-histone H3 analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — RNAi with defined mitotic phenotype and subcellular localization, Drosophila ortholog","pmids":["19225159"],"is_preprint":false},{"year":2011,"finding":"5-Fluorouracil (5FU) incorporation into RNA modifies Rrp6 (EXOSC10 ortholog in Drosophila) function in two ways: (1) it alters the repertoire of multimolecular complexes containing Rrp6, consistent with sequestration in ribonucleoprotein complexes; and (2) 5FU-containing RNA is less susceptible to degradation by Rrp6, as shown by in vitro activity assays. This reveals that RNA surveillance by EXOSC10 is compromised by 5FU.","method":"Gel filtration, in vitro Rrp6 exonuclease activity assay with 5FU-containing RNA","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro biochemical assay demonstrating reduced EXOSC10-ortholog activity on 5FU-modified RNA substrates","pmids":["21289297"],"is_preprint":false},{"year":2012,"finding":"Microprocessor (Drosha/Dgcr8), Setx, Xrn2, and Rrp6 (EXOSC10 ortholog) co-operate to induce premature termination of RNAPII transcription at the HIV-1 promoter and cellular gene targets. Rrp6 processes the TAR stem-loop cleavage product to generate a small RNA required for transcriptional repression and chromatin remodeling. ChIP-seq identified genome-wide cellular gene targets whose transcription is modulated by this microprocessor-Rrp6 mechanism.","method":"ChIP-seq, RNAi knockdown, reporter assays, chromatin remodeling assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP-seq, functional reporter, chromatin analysis) demonstrating Rrp6 role in RNAPII termination","pmids":["22980978"],"is_preprint":false},{"year":2014,"finding":"A 3.3 Å crystal structure of a ten-subunit yeast RNA exosome (Exo9 core + Rrp6) bound to poly(A) RNA showed that the Rrp6 catalytic domain rests atop the Exo9 S1/KH ring above the central channel, with the RNA 3' end anchored in the Rrp6 active site and remaining RNA traversing the S1/KH ring. Solution studies with human and yeast exosomes demonstrated that this RNA path to Rrp6 is conserved and dependent on S1/KH ring integrity.","method":"X-ray crystallography at 3.3 Å, solution biochemical studies with human exosome","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with functional validation in both yeast and human complexes","pmids":["25043052"],"is_preprint":false},{"year":2014,"finding":"Rrp6 and its cofactor Rrp47 form a highly intertwined structural unit via their N-terminal domains. Together they create a composite conserved surface groove that binds the N-terminus of the Mtr4 helicase, thereby recruiting Mtr4 to the exosome. Mutations in conserved residues at the Rrp6–Mtr4 interface disrupt their interaction and inhibit cell growth, linking this structural interface to exosome function.","method":"X-ray crystallography, in vitro binding assays, mutagenesis, cell growth assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis validating the Rrp6-Rrp47-Mtr4 interface functionally","pmids":["25319414"],"is_preprint":false},{"year":2015,"finding":"EXOSC10 (RRP6) and its Drosophila ortholog RRP6 are recruited to DNA double-strand breaks (DSBs). Depletion of RRP6/EXOSC10 does not affect H2AX phosphorylation but impairs RAD51 recruitment to DSBs without altering RAD51 levels. Catalytically inactive RRP6 (Y361A mutant) overexpression also inhibits RAD51 recruitment. EXOSC10 can be co-immunoprecipitated with RAD51, linking EXOSC10 to homologous recombination. EXOSC10-depleted cells show hypersensitivity to radiation.","method":"RNAi, co-immunoprecipitation, immunofluorescence at DSBs, dominant-negative mutagenesis, radiation sensitivity assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, active-site mutant dominant negative, and functional radiation sensitivity with RAD51 recruitment defect","pmids":["25632158"],"is_preprint":false},{"year":2016,"finding":"Cooling of mammalian cells triggers SUMOylation of EXOSC10 (hRrp6/PM/Scl-100), specifically conjugation of SUMO1 to defined sites on EXOSC10 identified by mutagenesis. This SUMOylation reduces EXOSC10 abundance. EXOSC10 knockdown by RNAi recapitulates the 3' pre-rRNA processing defects and reduced 40S:60S ribosomal subunit ratio seen in the cold. Overexpression of SUMO1 alone is sufficient to suppress EXOSC10 abundance, demonstrating that SUMOylation is a post-translational mechanism for downregulating EXOSC10 and thereby reducing ribosome biogenesis.","method":"SUMOylation site mutagenesis, RNAi, ribosomal subunit ratio analysis, in vivo cooling model","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 — mutagenesis of SUMO sites in EXOSC10, functional rescue and knockdown with rRNA processing readout, validated in vivo","pmids":["26857222"],"is_preprint":false},{"year":2017,"finding":"EXOSC10 protein is detected in nucleoli and the cytoplasm of mitotic and meiotic male germ cells and transiently associates with the XY body (targeted by meiotic sex chromosome inactivation). EXOSC10 becomes unstable at later stages of gamete development, indicating post-translational regulation. Conditional knockout of Exosc10 in male germ cells using Stra8- or Vasa-cre results in small testes, impaired germ cell differentiation, and subfertility, establishing an essential role for EXOSC10 in germ cell growth and development.","method":"Conditional knockout (Cre-lox), immunofluorescence localization, testis histology","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined physiological phenotype plus localization experiments","pmids":["29118343"],"is_preprint":false},{"year":2018,"finding":"RRP6 (EXOSC10) participates in two-step processing of human telomerase RNA (hTR) precursor: longer extended forms are first trimmed by RRP6 and shorter forms are then processed by PARN. H/ACA RNP assembly promotes productive processing by disrupting tertiary RNA interactions (triplex) in longer precursors that otherwise favor RNA degradation. Thus EXOSC10 activity on hTR precursors is modulated by RNA structure and RNP assembly state.","method":"In vitro processing assays with RRP6 and PARN, RNA structure analysis, RNP assembly assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of RRP6 processing activity with defined RNA substrates, structure-function analysis","pmids":["30575725"],"is_preprint":false},{"year":2019,"finding":"EXOSC10 is required for DNA double-strand break repair by homologous recombination. Depletion of EXOSC10 leads to increased damage-induced long non-coding RNA (dilncRNA) and DNA-RNA hybrid (R-loop) levels at DSBs. RPA targeting to DNA damage sites is impaired, while DNA end resection is hyper-stimulated in EXOSC10-depleted cells. The resection deregulation is abolished by transcription inhibitors, and RNase H1 overexpression restores RPA recruitment, demonstrating that EXOSC10-mediated RNA clearance of dilncRNAs is required for RPA assembly and controlled DNA end resection.","method":"siRNA knockdown, immunofluorescence at DSBs, DNA-RNA hybrid (S9.6) detection, end-resection assay, RNase H1 rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (RNA-DNA hybrid detection, RNase H1 rescue, transcription inhibitors) establishing mechanistic epistasis","pmids":["31086179"],"is_preprint":false},{"year":2020,"finding":"EXOSC10 sculpts the oocyte transcriptome during the growth-to-maturation transition. Oocyte-specific conditional knockout of Exosc10 in mice causes female subfertility due to delayed germinal vesicle breakdown (GVBD). Single-oocyte RNA-seq revealed dysregulation of mRNAs encoding endomembrane trafficking proteins and meiotic cell cycle regulators. EXOSC10-depleted oocytes show impaired endomembrane components (endosomes, lysosomes, ER, Golgi), failure of CDK1 activation (due to persistent WEE1 activity), impaired lamina phosphorylation/disassembly, and rRNA processing defects causing higher rates of developmentally incompetent oocytes.","method":"CRISPR/Cas9 conditional knockout, single-oocyte RNA-seq, immunofluorescence, live-cell imaging of GVBD","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with single-cell transcriptomics and multiple cellular phenotypic readouts establishing mechanistic pathway","pmids":["32313933"],"is_preprint":false}],"current_model":"EXOSC10 (PM/Scl-100/hRrp6) is the nuclear-specific catalytic subunit of the human RNA exosome that performs distributive 3'→5' exoribonuclease activity (RNase D/two-metal-ion mechanism) on a broad range of nuclear RNA substrates including rRNA precursors, snoRNAs, promoter-upstream transcripts, ARE-containing mRNAs, and telomerase RNA precursors; it is recruited to the exosome core via its N-terminal PMC2NT domain (which also binds cofactor Rrp47/Lrp1), is stimulated by the TRAMP complex, is regulated post-translationally by SUMO1 conjugation in response to cold stress, localizes to sites of DNA double-strand breaks where its ribonucleolytic activity clears damage-induced lncRNAs to enable RPA recruitment and controlled DNA end resection for homologous recombination, and plays essential developmental roles in oogenesis and spermatogenesis."},"narrative":{"teleology":[{"year":1999,"claim":"Identifying EXOSC10 as the nuclear-specific exosome subunit established that the RNA exosome exists in functionally distinct nuclear and cytoplasmic forms, with PM/Scl-100 (RRP6) exclusively marking the nuclear complex.","evidence":"Biochemical fractionation and immunofluorescence in human cells, with genetic complementation in yeast","pmids":["10465791"],"confidence":"High","gaps":["Human-specific interaction partners beyond the core exosome were not identified","Catalytic activity of the human protein was not directly demonstrated"]},{"year":2001,"claim":"Demonstrating exosome recruitment to ARE-containing mRNAs via AU-rich element binding proteins revealed that EXOSC10 functions not only in rRNA processing but in regulated mRNA turnover.","evidence":"Mass spectrometry identification of purified mammalian exosome and cell-free ARE-mRNA decay assay","pmids":["11719186"],"confidence":"High","gaps":["Direct contribution of EXOSC10 catalytic activity versus core exosome activity on ARE substrates was not separated"]},{"year":2003,"claim":"Linking EXOSC10 to nonsense-mediated mRNA decay expanded its role from general RNA surveillance to a specialized quality-control pathway by showing that its depletion stabilizes premature-termination-codon-containing mRNAs.","evidence":"RNAi knockdown with mRNA decay rate measurement and co-IP with Upf1/Upf2/Upf3X in human cells","pmids":["14527413"],"confidence":"High","gaps":["Whether EXOSC10 is rate-limiting for NMD versus redundant with DIS3 was not resolved"]},{"year":2006,"claim":"Crystal structures of the yeast Rrp6 RNase D domain and reconstitution of multisubunit exosomes defined EXOSC10 as a distributive hydrolytic 3′→5′ exoribonuclease mechanistically distinct from the processive activities of other exosome catalytic subunits.","evidence":"X-ray crystallography of Rrp6 with product-bound complexes; in vitro reconstitution of 9-, 10-, and 11-subunit exosomes with activity assays","pmids":["16882719","17174896"],"confidence":"High","gaps":["Human EXOSC10 structure had not yet been solved","How the distributive mechanism operates on structured substrates was unclear"]},{"year":2008,"claim":"Discovery that exosome depletion uncovers PROMPTs—short polyadenylated transcripts upstream of promoters—revealed a pervasive nuclear RNA surveillance function for EXOSC10 beyond characterized coding and ribosomal substrates.","evidence":"siRNA depletion of exosome subunits in human cells with tiling microarray detection of unstable transcripts","pmids":["19056938"],"confidence":"High","gaps":["Whether EXOSC10 catalytic activity specifically or the core exosome is responsible for PROMPT clearance was not distinguished"]},{"year":2009,"claim":"Reconstituting TRAMP-mediated stimulation of Rrp6 activity identified a direct enzymatic partnership: TRAMP enhances Rrp6 hydrolytic activity ~10-fold independently of its own poly(A) polymerase and helicase functions.","evidence":"In vitro assay with purified TRAMP and recombinant Rrp6, abolished by active-site mutation","pmids":["19955569"],"confidence":"High","gaps":["The molecular basis of stimulation (conformational change vs. substrate delivery) was not determined","Whether this mechanism is conserved for human EXOSC10 was not tested"]},{"year":2011,"claim":"Solving the human EXOSC10 crystal structure revealed a more exposed active site than the yeast ortholog, explaining its enhanced activity on structured RNA substrates and confirming the conserved RNase D mechanism.","evidence":"X-ray crystallography of human RRP6 exoribonuclease/HRDC domains with comparative in vitro exonuclease assays","pmids":["21705430"],"confidence":"High","gaps":["Structure of the full-length human EXOSC10 in complex with the exosome core was not obtained"]},{"year":2011,"claim":"The exosome's association with AID at immunoglobulin switch regions revealed an unexpected role in adaptive immunity, where the exosome enables AID access to both DNA strands during class switch recombination.","evidence":"Co-IP, ChIP at IgH switch regions, and in vitro DNA deamination assay with recombinant exosome in activated B cells","pmids":["21255825"],"confidence":"High","gaps":["Specific catalytic contribution of EXOSC10 versus DIS3 to CSR was not delineated"]},{"year":2012,"claim":"Demonstrating that Rrp6 processes Microprocessor-generated TAR stem-loop cleavage products into small RNAs for transcriptional silencing linked EXOSC10 to RNA-mediated chromatin remodeling at the HIV-1 promoter and cellular gene targets.","evidence":"ChIP-seq, RNAi, and reporter assays at HIV-1 promoter and genome-wide cellular targets","pmids":["22980978"],"confidence":"High","gaps":["Whether EXOSC10 directly generates the small RNAs or acts on intermediates was not fully resolved","Generalizability beyond HIV-associated and select cellular loci not established"]},{"year":2014,"claim":"The crystal structure of the 10-subunit exosome (Exo9+Rrp6) with bound RNA delineated the RNA path to the EXOSC10 active site through the S1/KH ring, and the Rrp6-Rrp47-Mtr4 interface structure explained how EXOSC10 recruits the Mtr4 helicase to the complex.","evidence":"3.3 Å crystal structure of yeast Exo10-RNA; crystal structure of Rrp6-Rrp47-Mtr4 N-terminus with mutagenesis validation in yeast and human systems","pmids":["25043052","25319414"],"confidence":"High","gaps":["Full cryo-EM structure of the complete TRAMP-exosome supercomplex with EXOSC10 was not available","Kinetic partitioning of substrates between Rrp6 and Dis3 pathways was not quantified"]},{"year":2015,"claim":"Showing that EXOSC10 is recruited to DNA double-strand breaks and that its catalytic activity is required for RAD51 recruitment extended its role from RNA metabolism to the DNA damage response and homologous recombination.","evidence":"Co-IP of EXOSC10 with RAD51, dominant-negative catalytic mutant, immunofluorescence at DSBs, and radiation sensitivity in human and Drosophila cells","pmids":["25632158"],"confidence":"High","gaps":["The RNA substrate at DSBs whose clearance enables RAD51 loading was not identified"]},{"year":2016,"claim":"Identification of cold-induced SUMO1 conjugation to EXOSC10 as a mechanism to reduce its abundance established the first post-translational regulatory pathway controlling exosome function and connecting environmental stress to ribosome biogenesis.","evidence":"SUMO site mutagenesis, SUMO1 overexpression, RNAi phenocopy of rRNA processing defects and ribosomal subunit ratio shifts","pmids":["26857222"],"confidence":"High","gaps":["Identity of the SUMO E3 ligase targeting EXOSC10 was not determined","Whether SUMOylation affects EXOSC10 functions beyond rRNA processing is unknown"]},{"year":2018,"claim":"Reconstituting RRP6-dependent trimming of telomerase RNA precursors showed that EXOSC10 acts in the first step of a two-step hTR maturation pathway modulated by RNA tertiary structure and H/ACA RNP assembly.","evidence":"In vitro processing assays with purified RRP6 and PARN on defined hTR precursor substrates with structural analysis","pmids":["30575725"],"confidence":"High","gaps":["Whether this pathway is rate-limiting for telomerase assembly in vivo was not tested"]},{"year":2019,"claim":"Mechanistic dissection of the DSB repair defect revealed that EXOSC10 clears damage-induced lncRNAs and DNA-RNA hybrids at break sites, and that failure to do so causes uncontrolled DNA end resection and loss of RPA recruitment—a defect rescued by RNase H1.","evidence":"siRNA knockdown, S9.6 antibody detection of R-loops, DNA end resection assay, RNase H1 rescue, and transcription inhibitor epistasis in human cells","pmids":["31086179"],"confidence":"High","gaps":["The specific dilncRNA species targeted by EXOSC10 at breaks were not sequenced","How EXOSC10 is recruited to DSBs remains unclear"]},{"year":2020,"claim":"Conditional knockout in oocytes demonstrated that EXOSC10 sculpts the maternal transcriptome to enable germinal vesicle breakdown, linking its RNA degradation activity to CDK1 activation, nuclear lamina disassembly, endomembrane integrity, and female fertility.","evidence":"CRISPR/Cas9 conditional KO with single-oocyte RNA-seq, live-cell imaging of GVBD, and phenotypic characterization","pmids":["32313933"],"confidence":"High","gaps":["Direct RNA targets whose degradation is rate-limiting for GVBD were not functionally validated individually","Whether EXOSC10 acts independently of the core exosome in oocytes is unknown"]},{"year":null,"claim":"Key unresolved questions include the structural basis for substrate partitioning between EXOSC10 and DIS3 within the intact nuclear exosome, the mechanism by which EXOSC10 is recruited to DNA damage sites, and whether its roles in gametogenesis and DNA repair require core-exosome association or reflect exosome-independent functions.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full structural model of human nuclear exosome with both catalytic subunits and substrates","Recruitment mechanism of EXOSC10 to DSBs undefined","Exosome-dependent versus independent functions in germ cells not separated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[3,4,7,8,13,18]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4,8,13]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3,4,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,15,17]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[17]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,2,5,6,7,12,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[16]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[15,19]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9]}],"complexes":["RNA exosome (nuclear form)","TRAMP complex (functional partner)"],"partners":["RRP47","MTR4","DIS3","EXOSC3","RAD51","UPF1","DROSHA","PARN"],"other_free_text":[]},"mechanistic_narrative":"EXOSC10 is the nucleus-restricted catalytic subunit of the RNA exosome, performing distributive 3′→5′ exoribonuclease activity essential for RNA surveillance, quality control, and regulated gene expression across multiple nuclear RNA classes. Its RNase D-family active site processes rRNA precursors, snoRNAs, telomerase RNA (hTR) precursors, promoter-upstream transcripts (PROMPTs), and ARE-containing mRNAs, and it participates in nonsense-mediated mRNA decay [PMID:17174896, PMID:21705430, PMID:19056938, PMID:14527413, PMID:30575725]. EXOSC10 is recruited to the exosome core via its N-terminal PMC2NT domain, which together with cofactor Rrp47 forms a composite surface that docks the Mtr4 helicase; the TRAMP complex stimulates EXOSC10 hydrolytic activity, and cold-induced SUMO1 conjugation downregulates EXOSC10 abundance to reduce ribosome biogenesis [PMID:25319414, PMID:19955569, PMID:26857222]. Beyond RNA metabolism, EXOSC10 localizes to DNA double-strand breaks where its ribonucleolytic clearance of damage-induced lncRNAs and R-loops is required for RPA recruitment and controlled DNA end resection during homologous recombination, and conditional knockouts demonstrate essential roles in both oogenesis and spermatogenesis [PMID:31086179, PMID:25632158, PMID:32313933, PMID:29118343]."},"prefetch_data":{"uniprot":{"accession":"Q01780","full_name":"Exosome complex component 10","aliases":["Autoantigen PM/Scl 2","P100 polymyositis-scleroderma overlap syndrome-associated autoantigen","Polymyositis/scleroderma autoantigen 100 kDa","PM/Scl-100","Polymyositis/scleroderma autoantigen 2"],"length_aa":885,"mass_kda":100.8,"function":"Catalytic component of the RNA exosome complex which has 3'->5' exoribonuclease activity and participates in a multitude of cellular RNA processing and degradation events. In the nucleus, the RNA exosome complex is involved in proper maturation of stable RNA species such as rRNA, snRNA and snoRNA, in the elimination of RNA processing by-products and non-coding 'pervasive' transcripts, such as antisense RNA species and promoter-upstream transcripts (PROMPTs), and of mRNAs with processing defects, thereby limiting or excluding their export to the cytoplasm. 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). The RNA exosome may be involved in Ig class switch recombination (CSR) and/or Ig variable region somatic hypermutation (SHM) by targeting AICDA deamination activity to transcribed dsDNA substrates. In the cytoplasm, the RNA exosome complex is involved in general mRNA turnover and specifically degrades inherently unstable mRNAs containing AU-rich elements (AREs) within their 3' untranslated regions, and in RNA surveillance pathways, preventing translation of aberrant mRNAs. It seems to be involved in degradation of histone mRNA. EXOSC10 is required for nucleolar localization of C1D and probably mediates the association of MTREX, C1D and MPHOSPH6 with the RNA exosome involved in the maturation of 5.8S rRNA. Plays a role in the recruitment of replication protein A complex (RPA) and RAD51 to DNA double-strand breaks caused by irradiation, contributing to DNA repair by homologous recombination (PubMed:25632158, PubMed:31086179). Regulates levels of damage-induced RNAs in order to prevent DNA-RNA hybrid formation at DNA double-strand breaks and limit DNA end resection after damage (PubMed:31086179). Plays a role in oocyte development, maturation and survival (By similarity). Required for normal testis development and mitotic division of spermatogonia (By similarity). Plays a role in proper embryo development (By similarity). Required for global protein translation (PubMed:26857222, PubMed:36912080). Required for cell proliferation (PubMed:36912080). 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replicated across organisms\",\n      \"pmids\": [\"10465791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The crystal structure of yeast Rrp6p (ortholog of EXOSC10) reveals a conserved RNase D core with a flanking HRDC domain; complexes with AMP and UMP show how the enzyme specifically recognizes ribonucleotides; the HRDC domain adopts an unusual conformation important for RNA processing function, and in vivo mutagenesis of domain contacts disrupts processing.\",\n      \"method\": \"X-ray crystallography, in vivo mutational analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional mutagenesis validation\",\n      \"pmids\": [\"16882719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rrp6p (yeast ortholog of EXOSC10) uses a two-metal ion mechanism for phosphodiester bond hydrolysis; mutation of conserved active-site residues including Tyr361 abolishes both in vitro and in vivo activity; the HRDC domain point mutant retains nuclear localization but selectively loses 5.8S pre-rRNA and pre-snoRNA 3' end processing while retaining rRNA degradation activity.\",\n      \"method\": \"In vitro ribonuclease assay, active-site mutagenesis, in vivo RNA processing assays\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with active-site mutagenesis, multiple orthogonal assays\",\n      \"pmids\": [\"12923258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Loss of yeast Rrp6p (ortholog of EXOSC10) leads to accumulation of polyadenylated, promoter-associated noncoding transcripts (~250–500 nt) that are normally rapidly degraded in the nucleus, revealing a role for Rrp6p in surveillance and degradation of cryptic unstable transcripts (CUTs) at gene promoters.\",\n      \"method\": \"Whole-genome microarray comparison of rrp6Δ vs wild-type yeast RNA, fine mapping of transcripts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide loss-of-function with specific molecular phenotype, replicated class\",\n      \"pmids\": [\"16484372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rrp6p (ortholog of EXOSC10) can carry out certain RNA 3'-end processing functions (5.8S rRNA, snoRNA maturation) independently of physical association with the core nine-subunit exosome; interaction with the core exosome is required for degradation of specific poly(A)+ rRNA processing products that need combined Dis3p and Rrp6p activities.\",\n      \"method\": \"Genetic truncation analysis, co-purification, in vivo RNA processing assays in yeast\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (genetics, biochemistry, RNA analysis), clear epistasis\",\n      \"pmids\": [\"18940861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The TRAMP complex (Trf4/Air1/Mtr4) directly stimulates the hydrolytic exoribonuclease activity of purified Rrp6p (ortholog of EXOSC10) ~10-fold in vitro; this stimulation requires the catalytic active site of Rrp6p and is independent of TRAMP's poly(A) polymerase or helicase activities.\",\n      \"method\": \"In vitro RNA degradation assay with purified components, active-site mutant Rrp6p, ATP/polyadenylation dependence assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro assay with active-site mutagenesis controls\",\n      \"pmids\": [\"19955569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rrp47p (exosome cofactor) directly interacts with the N-terminal PMC2NT domain of Rrp6p (ortholog of EXOSC10); Rrp47p forms an apparently hexameric complex that binds structured nucleic acids; loss of the PMC2NT domain prevents Rrp47p accumulation and causes RNA processing defects equivalent to loss of Rrp47p.\",\n      \"method\": \"Pull-down assays with recombinant proteins, gel filtration, in vivo mutagenesis, RNA processing analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct binding assay with recombinant proteins plus in vivo functional validation\",\n      \"pmids\": [\"17704127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human EXOSC10 (hRRP6/PM-Scl-100) possesses distributive 3'→5' exoribonuclease activity; the X-ray crystal structure of the human exoribonuclease+HRDC domain shows a more exposed active site compared to yeast Rrp6p, which correlates with the ability of human RRP6 to degrade structured RNA substrates more efficiently than yeast Rrp6.\",\n      \"method\": \"X-ray crystallography, in vitro exoribonuclease assays comparing human and yeast enzymes and truncation mutants\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure plus biochemical reconstitution with multiple constructs\",\n      \"pmids\": [\"21705430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human EXOSC10 (Rrp6) and factors Microprocessor, Setx, and Xrn2 cooperate to induce RNAPII pausing and premature transcription termination; Rrp6 processes the Drosha/Dgcr8 cleavage product at the HIV-1 TAR stem-loop to generate a small RNA required for transcriptional repression and chromatin remodeling at the HIV-1 promoter.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), ChIP-seq, RNA processing assays, transcription elongation assays in human cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, genome-wide ChIP-seq, mechanistic detail\",\n      \"pmids\": [\"22980978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure (3.3 Å) of the yeast ten-subunit exosome (Exo9 + Rrp6) bound to poly(A) RNA shows that the Rrp6 catalytic domain rests on top of the S1/KH ring above the central channel with RNA 3' end anchored in the Rrp6 active site, traversing the ring in an orientation opposite to that seen for Rrp44; solution studies confirm this RNA path to Rrp6 is conserved in human exosome and dependent on S1/KH ring integrity.\",\n      \"method\": \"X-ray crystallography (3.3 Å), solution studies with human and yeast exosome complexes\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with human validation, strong mechanistic insight\",\n      \"pmids\": [\"25043052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The N-terminal domains of Rrp6 and its cofactor Rrp47 form a highly intertwined structural unit creating a composite surface groove that binds the N-terminus of Mtr4 helicase; mutation of conserved residues at the Rrp6-Mtr4 interface disrupts their interaction and impairs yeast growth.\",\n      \"method\": \"Crystallographic analysis, in vitro binding assays, site-directed mutagenesis, growth assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis and functional validation\",\n      \"pmids\": [\"25319414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EXOSC10 (RRP6) and its Drosophila ortholog RRP6 are recruited to DNA double-strand breaks (DSBs); depletion of RRP6/EXOSC10 impairs RAD51 recruitment to DSBs (without affecting H2AX phosphorylation or RAD51 levels) and increases radiation sensitivity; catalytically inactive RRP6-Y361A mutant also blocks RAD51 recruitment; RRP6/EXOSC10 co-immunoprecipitates with RAD51.\",\n      \"method\": \"Immunofluorescence at DSB sites, siRNA depletion, catalytic mutant overexpression, co-immunoprecipitation, radiation sensitivity assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including catalytic mutant, co-IP, and functional phenotype\",\n      \"pmids\": [\"25632158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"EXOSC10 is SUMOylated (SUMO1 conjugation) in human cells; this modification is increased by cellular cooling; overexpression of SUMO1 alone is sufficient to suppress EXOSC10 protein abundance; EXOSC10 depletion causes 3' pre-rRNA processing defects and a reduced 40S:60S ribosomal subunit ratio, linking EXOSC10 SUMOylation to down-regulation of ribosome biogenesis.\",\n      \"method\": \"In vivo SUMOylation assay, mutagenesis of SUMOylation sites, RNAi knockdown, ribosome profiling, rRNA processing analysis in human cells and in vivo cooling model\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — identified PTM writer (SUMO1), mutagenesis of modification sites, functional consequences with multiple readouts\",\n      \"pmids\": [\"26857222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EXOSC10 depletion in human cells leads to accumulation of damage-induced lncRNAs (dilncRNAs) and DNA-RNA hybrids at DSB sites, impairs RPA recruitment to DSBs, and causes hyper-stimulated DNA end resection; RNase H1 overexpression rescues the RPA recruitment defect, demonstrating that EXOSC10's RNA clearance activity is required for controlled DNA end resection and homologous recombination machinery assembly.\",\n      \"method\": \"siRNA depletion, dilncRNA quantification, DNA-RNA hybrid immunofluorescence (S9.6), RPA and RAD51 ChIP, transcription inhibitor rescue, RNase H1 overexpression rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal rescue experiments establishing mechanism, strong epistasis\",\n      \"pmids\": [\"31086179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EXOSC10 is required for the growth-to-maturation transition in mouse oocytes; oocyte-specific Exosc10 knockout causes delayed germinal vesicle breakdown (GVBD) and female subfertility; EXOSC10 depletion leads to dysregulation of mRNAs encoding endomembrane trafficking proteins and meiotic cell cycle regulators, impaired CDK1 activation (due to persistent WEE1), defective lamina disassembly, and rRNA processing defects.\",\n      \"method\": \"CRISPR/Cas9 conditional knockout, single-oocyte RNA-seq, CDK1/WEE1 activity assays, immunofluorescence of endomembrane markers\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with specific molecular phenotypes validated by multiple approaches\",\n      \"pmids\": [\"32313933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EXOSC10 protein localizes to nucleoli and cytoplasm of mitotic and meiotic male germ cells and transiently associates with the XY body (linked to meiotic sex chromosome inactivation); EXOSC10 becomes unstable (post-translationally regulated) at later stages of germ cell development; germ cell-specific Exosc10 knockout causes impaired germ cell differentiation and male subfertility.\",\n      \"method\": \"Immunofluorescence/localization in germ cells, Cre-lox conditional knockout (Stra8-Cre, Ddx4-Cre), testis histology, fertility assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence, conditional KO with specific phenotype\",\n      \"pmids\": [\"29118343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"EXOSC10 (RRP6) performs the first trimming step of 3'-extended human telomerase RNA (hTR) precursors; H/ACA RNP assembly disrupts a triplex structure in longer hTR precursors, stimulating productive processing by RRP6; processing occurs in two steps with RRP6 acting on longer forms first, followed by PARN acting on shorter forms.\",\n      \"method\": \"In vitro RNA processing assays, RNP assembly assays, RNA structure probing, RRP6/PARN depletion in human cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution plus cell-based depletion, two-step mechanism defined\",\n      \"pmids\": [\"30575725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Incorporation of 5-fluorouracil (5FU) into RNA renders the RNA less susceptible to degradation by Rrp6 (ortholog of EXOSC10) in vitro; 5FU treatment also modifies the repertoire of multimolecular complexes containing Rrp6, consistent with sequestration in ribonucleoprotein complexes.\",\n      \"method\": \"In vitro Rrp6 activity assay with 5FU-containing RNA, gel filtration analysis of RNP complexes in Drosophila S2 cells\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 in vitro — single lab, Drosophila cell system, moderate follow-up\",\n      \"pmids\": [\"21289297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The nuclear exosome subunit Rrp6p (ortholog of EXOSC10) counteracts extension of mature poly(A) tails by Trf4p and directly interacts with the poly(A)-binding protein Nab2p, displacing it from poly(A) tails and potentially targeting mRNPs for RNA turnover; this defines a nuclear mRNP surveillance step.\",\n      \"method\": \"Purified in vitro polyadenylation system, in vivo poly(A) tail length assay, co-immunoprecipitation of Rrp6p with Nab2p\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — purified system plus in vivo validation and co-IP, multiple orthogonal methods\",\n      \"pmids\": [\"22683267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Drosophila dRrp6 (ortholog of EXOSC10) is required for cell proliferation and error-free mitosis independently of the core exosome; dRrp6 depletion causes chromosome congression, separation, and segregation defects; endogenous dRrp6 redistributes during mitosis and accumulates on condensed chromosomes, whereas core subunits localize to microtubules.\",\n      \"method\": \"RNAi depletion in Drosophila S2 cells, microarray, immunofluorescence localization during mitosis, mitotic marker analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence, but single lab Drosophila study\",\n      \"pmids\": [\"19225159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Rrp6 (ortholog of EXOSC10) is directly required for RNAPII termination at NNS-dependent targets in yeast; deletion of RRP6 causes hyper-elongation of RNAPII at specific NNS targets including CUTs, leading to transcription interference and antisense repression; Rrp6 acts with the NNS complex globally to promote termination in addition to RNA processing.\",\n      \"method\": \"RNA-seq, ChIP-exo of RNAPII in rrp6Δ yeast, comparison with Nrd1-depleted cells\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-exo and RNA-seq with strong epistasis, replicated concept\",\n      \"pmids\": [\"25680078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"The PM-Scl antigen (containing EXOSC10/PM-Scl-100) localizes primarily to the granular component of the nucleolus by electron microscopy; immunofluorescence shows nucleolar staining that is disrupted by actinomycin D (rRNA synthesis inhibitor) and DRB; anti-PM-Scl antibodies precipitate 11 polypeptides (Mr 110,000–20,000), suggesting the antigen complex may be related to a preribosomal particle.\",\n      \"method\": \"Indirect immunofluorescence, electron microscopy, drug treatment (actinomycin D, DRB), immunoprecipitation\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct localization by EM and IF with drug-based functional inference; foundational characterization\",\n      \"pmids\": [\"3537125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Depletion of yeast Rrp6 (ortholog of EXOSC10) or its cofactor Mtr4 causes accumulation of polyadenylated RNAs in a discrete subnucleolar domain enriched for U14 snoRNA and Nop1; in strains lacking both Rrp6 and the poly(A) polymerase Trf4, this accumulation is suppressed, implicating TRAMP complex-mediated polyadenylation upstream of Rrp6 surveillance.\",\n      \"method\": \"FISH for poly(A)+ RNA, genetic double-mutant epistasis, immunofluorescence\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis with clean genetic controls and direct localization\",\n      \"pmids\": [\"17403903\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EXOSC10 (PM-Scl-100/hRRP6) is the nuclear-specific catalytic subunit of the RNA exosome complex, a distributive 3'→5' exoribonuclease that processes and degrades diverse nuclear RNA substrates (rRNA, snoRNA, CUTs, dilncRNAs, hTR precursors) via a two-metal-ion mechanism; its activity is stimulated by the TRAMP complex, regulated by SUMOylation, dependent on interaction with cofactors Rrp47 and Mtr4 through defined structural interfaces, and is also required for DNA double-strand break repair by clearing damage-induced RNAs to permit RPA loading and controlled DNA end resection, and for normal gametogenesis and oocyte maturation.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"Human EXOSC10 (PM/Scl-100/RRP6) was identified as a component of the human PM-Scl complex, which is the functional equivalent of the yeast exosome. The nuclear form of the complex in both yeast and humans contains Rrp6p/PM-Scl100 exclusively, distinguishing the nuclear from cytoplasmic exosome. Human homologs complemented mutations in respective yeast exosome genes.\",\n      \"method\": \"Biochemical fractionation, indirect immunofluorescence, genetic complementation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal biochemical fractionation plus genetic complementation in yeast, replicated across organisms\",\n      \"pmids\": [\"10465791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PM/Scl100 (EXOSC10) was identified as a component of the human exosome required for rapid degradation of ARE-containing mRNAs. AU-rich element binding proteins recruit the exosome (including PM/Scl100) to unstable RNAs to promote their degradation. The mammalian exosome was purified and characterized by mass spectrometry.\",\n      \"method\": \"Mass spectrometry, cell-free RNA decay assay, immunoprecipitation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstituted decay system with purified complex, mass spectrometry identification\",\n      \"pmids\": [\"11719186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Downregulating PM/Scl100 (EXOSC10) significantly increases the abundance of nonsense-containing mRNAs and slows their decay rate, demonstrating its role in nonsense-mediated mRNA decay (NMD). NMD factors Upf1, Upf2, and Upf3X co-immunopurify with PM/Scl100 and other exosomal components, linking EXOSC10 to both 3'→5' degradation and the NMD pathway.\",\n      \"method\": \"RNAi knockdown, mRNA decay rate assay, co-immunoprecipitation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional knockdown with defined decay phenotype plus co-IP linking EXOSC10 to NMD machinery\",\n      \"pmids\": [\"14527413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The crystal structure of yeast Rrp6p (ortholog of EXOSC10) reveals a conserved RNase D core with an HRDC domain in an unusual conformation important for RNA processing. Co-crystals with AMP and UMP products reveal how the protein specifically recognizes ribonucleotides. In vivo mutational studies show domain contacts are critical for the processing function, highlighting differences from prokaryotic RNase D counterparts.\",\n      \"method\": \"X-ray crystallography, in vitro exonuclease assay, in vivo mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with product-bound complexes validated by in vivo mutagenesis\",\n      \"pmids\": [\"16882719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Reconstitution of 9-, 10-, and 11-subunit eukaryotic exosomes established that human Rrp41/Rrp45 has processive phosphorolytic activity, yeast Rrp44 has processive hydrolytic activity, and Rrp6 (EXOSC10 ortholog) has distributive hydrolytic 3'→5' exoribonuclease activity. The 3.35 Å X-ray structure of the 9-subunit human exosome was also determined, revealing the conserved architecture.\",\n      \"method\": \"In vitro reconstitution, exonuclease assays with multiple RNA substrates, X-ray crystallography\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — full reconstitution plus structure, defining catalytic mechanism of Rrp6/EXOSC10\",\n      \"pmids\": [\"17174896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rrp6p (EXOSC10 ortholog) can carry out some RNA 3'-end processing functions (5.8S rRNA, snoRNAs) and degrade certain rRNA intermediates independently of physical association with the core exosome. However, Rrp6p–core exosome interaction is required for efficient degradation of poly(A)+ rRNA processing products that require combined activities of Dis3p and Rrp6p.\",\n      \"method\": \"Truncation mutants, co-purification assays, in vivo RNA analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined molecular separation of core-dependent vs. independent Rrp6 functions in yeast ortholog\",\n      \"pmids\": [\"18940861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Depletion of the RNA exosome (including its nuclear component equivalent to EXOSC10) from human cells revealed a class of short, polyadenylated, highly unstable promoter upstream transcripts (PROMPTs) produced ~0.5–2.5 kb upstream of active transcription start sites, demonstrating that EXOSC10/exosome normally degrades these bidirectional transcripts.\",\n      \"method\": \"siRNA depletion, tiling microarray, nuclear RNA analysis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — exosome depletion in human cells with genome-wide substrate identification\",\n      \"pmids\": [\"19056938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The TRAMP complex enhances RNA degradation by the nuclear exosome specifically through stimulation of Rrp6 (EXOSC10 ortholog) activity. Purified TRAMP incubated with recombinant Rrp6 results in a 10-fold enhancement of RNA degradation rate via the hydrolytic activity of Rrp6; an Rrp6 active-site mutant abolishes this enhancement. This enhancement is independent of TRAMP's poly(A) polymerase or helicase activities.\",\n      \"method\": \"In vitro reconstituted RNA degradation assay with purified components, active-site mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified TRAMP and recombinant Rrp6, validated with active-site mutant\",\n      \"pmids\": [\"19955569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human RRP6 (EXOSC10/PM-Scl100) was characterized biochemically; full-length enzyme and truncation mutants retaining catalytic activity were expressed, and the X-ray structure of the human RRP6 exoribonuclease and HRDC domain was determined. Human RRP6 degrades structured RNA substrates more effectively than yeast Rrp6 due to a more exposed active site. Human RRP6 catalyzes distributive 3'→5' exoribonuclease activity on nuclear transcripts including ribosomal RNA precursors.\",\n      \"method\": \"X-ray crystallography, in vitro exonuclease assays, truncation mutagenesis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure of human EXOSC10 with biochemical activity validation and comparative mutagenesis\",\n      \"pmids\": [\"21705430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The RNA exosome (with EXOSC10 contributing to both strands access) associates with AID (activation-induced cytidine deaminase) in B cells activated for class switch recombination. The exosome complex accumulates on IgH switch regions in an AID-dependent fashion and is required for optimal class switch recombination. A recombinant RNA exosome core complex imparts robust AID- and transcription-dependent DNA deamination of both strands in vitro, revealing a role for the exosome in targeting AID to template DNA strand.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, in vitro DNA deamination assay with recombinant exosome, RNAi\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of exosome-AID activity plus ChIP and functional CSR assay in B cells\",\n      \"pmids\": [\"21255825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Drosophila Rrp6 (ortholog of EXOSC10) is required for cell proliferation and error-free mitosis independently of the core exosome subunit Rrp40. Depletion of dRrp6 increases cell cycle- and mitosis-related transcripts, decreases mitotic frequency, and causes chromosome congression/separation/segregation defects. dRrp6 dynamically redistributes to condensed chromosomes during mitosis, while core subunits localize to microtubules.\",\n      \"method\": \"RNAi knockdown in S2 cells, microarray, live-cell imaging, phospho-histone H3 analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNAi with defined mitotic phenotype and subcellular localization, Drosophila ortholog\",\n      \"pmids\": [\"19225159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"5-Fluorouracil (5FU) incorporation into RNA modifies Rrp6 (EXOSC10 ortholog in Drosophila) function in two ways: (1) it alters the repertoire of multimolecular complexes containing Rrp6, consistent with sequestration in ribonucleoprotein complexes; and (2) 5FU-containing RNA is less susceptible to degradation by Rrp6, as shown by in vitro activity assays. This reveals that RNA surveillance by EXOSC10 is compromised by 5FU.\",\n      \"method\": \"Gel filtration, in vitro Rrp6 exonuclease activity assay with 5FU-containing RNA\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro biochemical assay demonstrating reduced EXOSC10-ortholog activity on 5FU-modified RNA substrates\",\n      \"pmids\": [\"21289297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Microprocessor (Drosha/Dgcr8), Setx, Xrn2, and Rrp6 (EXOSC10 ortholog) co-operate to induce premature termination of RNAPII transcription at the HIV-1 promoter and cellular gene targets. Rrp6 processes the TAR stem-loop cleavage product to generate a small RNA required for transcriptional repression and chromatin remodeling. ChIP-seq identified genome-wide cellular gene targets whose transcription is modulated by this microprocessor-Rrp6 mechanism.\",\n      \"method\": \"ChIP-seq, RNAi knockdown, reporter assays, chromatin remodeling assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP-seq, functional reporter, chromatin analysis) demonstrating Rrp6 role in RNAPII termination\",\n      \"pmids\": [\"22980978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A 3.3 Å crystal structure of a ten-subunit yeast RNA exosome (Exo9 core + Rrp6) bound to poly(A) RNA showed that the Rrp6 catalytic domain rests atop the Exo9 S1/KH ring above the central channel, with the RNA 3' end anchored in the Rrp6 active site and remaining RNA traversing the S1/KH ring. Solution studies with human and yeast exosomes demonstrated that this RNA path to Rrp6 is conserved and dependent on S1/KH ring integrity.\",\n      \"method\": \"X-ray crystallography at 3.3 Å, solution biochemical studies with human exosome\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with functional validation in both yeast and human complexes\",\n      \"pmids\": [\"25043052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rrp6 and its cofactor Rrp47 form a highly intertwined structural unit via their N-terminal domains. Together they create a composite conserved surface groove that binds the N-terminus of the Mtr4 helicase, thereby recruiting Mtr4 to the exosome. Mutations in conserved residues at the Rrp6–Mtr4 interface disrupt their interaction and inhibit cell growth, linking this structural interface to exosome function.\",\n      \"method\": \"X-ray crystallography, in vitro binding assays, mutagenesis, cell growth assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis validating the Rrp6-Rrp47-Mtr4 interface functionally\",\n      \"pmids\": [\"25319414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EXOSC10 (RRP6) and its Drosophila ortholog RRP6 are recruited to DNA double-strand breaks (DSBs). Depletion of RRP6/EXOSC10 does not affect H2AX phosphorylation but impairs RAD51 recruitment to DSBs without altering RAD51 levels. Catalytically inactive RRP6 (Y361A mutant) overexpression also inhibits RAD51 recruitment. EXOSC10 can be co-immunoprecipitated with RAD51, linking EXOSC10 to homologous recombination. EXOSC10-depleted cells show hypersensitivity to radiation.\",\n      \"method\": \"RNAi, co-immunoprecipitation, immunofluorescence at DSBs, dominant-negative mutagenesis, radiation sensitivity assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, active-site mutant dominant negative, and functional radiation sensitivity with RAD51 recruitment defect\",\n      \"pmids\": [\"25632158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cooling of mammalian cells triggers SUMOylation of EXOSC10 (hRrp6/PM/Scl-100), specifically conjugation of SUMO1 to defined sites on EXOSC10 identified by mutagenesis. This SUMOylation reduces EXOSC10 abundance. EXOSC10 knockdown by RNAi recapitulates the 3' pre-rRNA processing defects and reduced 40S:60S ribosomal subunit ratio seen in the cold. Overexpression of SUMO1 alone is sufficient to suppress EXOSC10 abundance, demonstrating that SUMOylation is a post-translational mechanism for downregulating EXOSC10 and thereby reducing ribosome biogenesis.\",\n      \"method\": \"SUMOylation site mutagenesis, RNAi, ribosomal subunit ratio analysis, in vivo cooling model\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis of SUMO sites in EXOSC10, functional rescue and knockdown with rRNA processing readout, validated in vivo\",\n      \"pmids\": [\"26857222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EXOSC10 protein is detected in nucleoli and the cytoplasm of mitotic and meiotic male germ cells and transiently associates with the XY body (targeted by meiotic sex chromosome inactivation). EXOSC10 becomes unstable at later stages of gamete development, indicating post-translational regulation. Conditional knockout of Exosc10 in male germ cells using Stra8- or Vasa-cre results in small testes, impaired germ cell differentiation, and subfertility, establishing an essential role for EXOSC10 in germ cell growth and development.\",\n      \"method\": \"Conditional knockout (Cre-lox), immunofluorescence localization, testis histology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined physiological phenotype plus localization experiments\",\n      \"pmids\": [\"29118343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RRP6 (EXOSC10) participates in two-step processing of human telomerase RNA (hTR) precursor: longer extended forms are first trimmed by RRP6 and shorter forms are then processed by PARN. H/ACA RNP assembly promotes productive processing by disrupting tertiary RNA interactions (triplex) in longer precursors that otherwise favor RNA degradation. Thus EXOSC10 activity on hTR precursors is modulated by RNA structure and RNP assembly state.\",\n      \"method\": \"In vitro processing assays with RRP6 and PARN, RNA structure analysis, RNP assembly assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of RRP6 processing activity with defined RNA substrates, structure-function analysis\",\n      \"pmids\": [\"30575725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EXOSC10 is required for DNA double-strand break repair by homologous recombination. Depletion of EXOSC10 leads to increased damage-induced long non-coding RNA (dilncRNA) and DNA-RNA hybrid (R-loop) levels at DSBs. RPA targeting to DNA damage sites is impaired, while DNA end resection is hyper-stimulated in EXOSC10-depleted cells. The resection deregulation is abolished by transcription inhibitors, and RNase H1 overexpression restores RPA recruitment, demonstrating that EXOSC10-mediated RNA clearance of dilncRNAs is required for RPA assembly and controlled DNA end resection.\",\n      \"method\": \"siRNA knockdown, immunofluorescence at DSBs, DNA-RNA hybrid (S9.6) detection, end-resection assay, RNase H1 rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (RNA-DNA hybrid detection, RNase H1 rescue, transcription inhibitors) establishing mechanistic epistasis\",\n      \"pmids\": [\"31086179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EXOSC10 sculpts the oocyte transcriptome during the growth-to-maturation transition. Oocyte-specific conditional knockout of Exosc10 in mice causes female subfertility due to delayed germinal vesicle breakdown (GVBD). Single-oocyte RNA-seq revealed dysregulation of mRNAs encoding endomembrane trafficking proteins and meiotic cell cycle regulators. EXOSC10-depleted oocytes show impaired endomembrane components (endosomes, lysosomes, ER, Golgi), failure of CDK1 activation (due to persistent WEE1 activity), impaired lamina phosphorylation/disassembly, and rRNA processing defects causing higher rates of developmentally incompetent oocytes.\",\n      \"method\": \"CRISPR/Cas9 conditional knockout, single-oocyte RNA-seq, immunofluorescence, live-cell imaging of GVBD\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with single-cell transcriptomics and multiple cellular phenotypic readouts establishing mechanistic pathway\",\n      \"pmids\": [\"32313933\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EXOSC10 (PM/Scl-100/hRrp6) is the nuclear-specific catalytic subunit of the human RNA exosome that performs distributive 3'→5' exoribonuclease activity (RNase D/two-metal-ion mechanism) on a broad range of nuclear RNA substrates including rRNA precursors, snoRNAs, promoter-upstream transcripts, ARE-containing mRNAs, and telomerase RNA precursors; it is recruited to the exosome core via its N-terminal PMC2NT domain (which also binds cofactor Rrp47/Lrp1), is stimulated by the TRAMP complex, is regulated post-translationally by SUMO1 conjugation in response to cold stress, localizes to sites of DNA double-strand breaks where its ribonucleolytic activity clears damage-induced lncRNAs to enable RPA recruitment and controlled DNA end resection for homologous recombination, and plays essential developmental roles in oogenesis and spermatogenesis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"EXOSC10 (PM-Scl-100/Rrp6) is the nuclear-specific catalytic subunit of the RNA exosome, functioning as a distributive 3'→5' exoribonuclease that processes, surveils, and degrades diverse nuclear RNA substrates including pre-rRNA, snoRNAs, cryptic unstable transcripts (CUTs), telomerase RNA precursors, and aberrantly polyadenylated mRNPs [PMID:10465791, PMID:16484372, PMID:30575725, PMID:22683267]. Its RNase D catalytic core employs a two-metal-ion hydrolysis mechanism and is flanked by an HRDC domain that confers substrate selectivity, while its N-terminal PMC2NT domain scaffolds cofactors Rrp47 and the Mtr4 helicase into a composite surface essential for substrate channeling; the TRAMP complex stimulates EXOSC10 activity approximately 10-fold independently of polyadenylation [PMID:12923258, PMID:16882719, PMID:25319414, PMID:19955569]. Beyond RNA metabolism, EXOSC10 is recruited to DNA double-strand breaks where its catalytic activity clears damage-induced lncRNAs and DNA–RNA hybrids to permit RPA loading and controlled DNA end resection for homologous recombination [PMID:25632158, PMID:31086179]. EXOSC10 is also required for gametogenesis in both sexes: oocyte-specific knockout delays germinal vesicle breakdown through persistent WEE1/impaired CDK1 activation, and germ cell-specific knockout in males causes differentiation failure and subfertility [PMID:32313933, PMID:29118343].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Before EXOSC10's enzymatic function was known, its localization to the nucleolar granular component and association with an ~11-subunit complex suggested involvement in ribosome biogenesis.\",\n      \"evidence\": \"Electron microscopy and immunofluorescence of PM-Scl antigen in human cells with actinomycin D sensitivity\",\n      \"pmids\": [\"3537125\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity and function of associated polypeptides unknown\", \"No enzymatic activity demonstrated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of EXOSC10 as the nuclear-specific subunit of the exosome complex established that the nuclear and cytoplasmic forms of the 3'→5' exoribonuclease machine differ by a single catalytic component.\",\n      \"evidence\": \"Biochemical fractionation, immunofluorescence, and yeast complementation in human cells\",\n      \"pmids\": [\"10465791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism not yet characterized\", \"Substrate specificity not defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that EXOSC10 uses a two-metal-ion catalytic mechanism and that its HRDC domain selectively governs 3'-end processing (but not bulk degradation) resolved how a single enzyme distinguishes processing from degradation substrates.\",\n      \"evidence\": \"In vitro ribonuclease assays with active-site and HRDC mutants of yeast Rrp6p, in vivo RNA processing\",\n      \"pmids\": [\"12923258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for HRDC selectivity not yet visualized\", \"Cofactor requirements unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Crystal structures of the Rrp6p RNase D core with bound nucleotides, and genome-wide identification of CUTs as Rrp6-degraded transcripts, defined both the atomic basis for ribonucleotide recognition and a major class of physiological substrates — pervasive noncoding transcription products.\",\n      \"evidence\": \"X-ray crystallography of yeast Rrp6p; microarray of rrp6Δ yeast RNA\",\n      \"pmids\": [\"16882719\", \"16484372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CUTs are targeted to Rrp6 versus core exosome unclear\", \"Human substrate scope not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that cofactor Rrp47 binds the N-terminal PMC2NT domain of EXOSC10 and that polyadenylated RNAs accumulate in a subnucleolar focus in rrp6Δ cells (suppressed by loss of Trf4) revealed the TRAMP–Rrp6 surveillance pathway's subnuclear organization.\",\n      \"evidence\": \"Recombinant pull-downs and in vivo mutagenesis; FISH and genetic epistasis in yeast\",\n      \"pmids\": [\"17704127\", \"17403903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of the Rrp6–Rrp47 interface unresolved\", \"Whether subnucleolar domain exists in human cells unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that EXOSC10 can perform certain 3'-end processing events independently of the core exosome, while degradation of poly(A)+ rRNA intermediates requires core association, separated exosome-dependent from exosome-independent functions.\",\n      \"evidence\": \"Genetic truncation and co-purification analysis with RNA processing assays in yeast\",\n      \"pmids\": [\"18940861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether human EXOSC10 similarly acts independently of the core unclear\", \"Determinants of core-dependent vs independent targeting unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"In vitro reconstitution showing that the TRAMP complex stimulates EXOSC10 hydrolytic activity ~10-fold independently of polyadenylation or helicase activity identified TRAMP as a direct activator, not merely a substrate modifier.\",\n      \"evidence\": \"Purified Rrp6p activity assay with TRAMP components and active-site mutant controls\",\n      \"pmids\": [\"19955569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for TRAMP-mediated stimulation unknown\", \"Whether stimulation operates on all substrates or is selective unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The human EXOSC10 crystal structure revealed a more open active site compared to yeast, explaining the human enzyme's superior ability to degrade structured RNA substrates and establishing species-specific catalytic differences.\",\n      \"evidence\": \"X-ray crystallography and in vitro exoribonuclease assays comparing human and yeast enzymes\",\n      \"pmids\": [\"21705430\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length human EXOSC10 structure not available\", \"Contribution of cofactors to structured RNA degradation not assessed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Two studies expanded EXOSC10's functional roles: one showed it processes HIV-1 TAR-derived small RNAs to promote transcriptional silencing via RNAPII pausing, and another demonstrated it counteracts Trf4-mediated poly(A) extension by displacing Nab2 from mRNPs, defining a nuclear mRNP quality control step.\",\n      \"evidence\": \"ChIP-seq and RNA processing assays in human cells (HIV); in vitro polyadenylation system and co-IP of Rrp6–Nab2 in yeast\",\n      \"pmids\": [\"22980978\", \"22683267\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of Rrp6-mediated transcriptional silencing beyond HIV unclear\", \"Mechanism of Nab2 displacement not structurally resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two crystal structures resolved how EXOSC10 integrates into the exosome: the Exo9–Rrp6 structure showed RNA enters Rrp6 from atop the S1/KH ring via a path opposite to Rrp44, while the Rrp6–Rrp47 N-terminal structure revealed a composite surface groove recruiting Mtr4 helicase.\",\n      \"evidence\": \"3.3 Å crystal structures with solution studies; mutagenesis of Rrp6–Mtr4 interface in yeast\",\n      \"pmids\": [\"25043052\", \"25319414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full exosome structure with all cofactors simultaneously bound not yet achieved\", \"How substrate is partitioned between Rrp6 and Rrp44 paths in vivo unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that EXOSC10 is recruited to DNA double-strand breaks and that its catalytic activity is required for RAD51 recruitment, together with its role in NNS-dependent transcription termination genome-wide, expanded its function beyond RNA processing to genome maintenance and transcription regulation.\",\n      \"evidence\": \"Immunofluorescence at DSBs with catalytic mutant analysis and co-IP in human/Drosophila cells; ChIP-exo of RNAPII in rrp6Δ yeast\",\n      \"pmids\": [\"25632158\", \"25680078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of EXOSC10 recruitment to DSBs unknown\", \"Whether DSB role requires core exosome association untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of SUMO1 conjugation on EXOSC10 that suppresses its protein abundance, particularly under cellular cooling, linked post-translational regulation of EXOSC10 to modulation of ribosome biogenesis.\",\n      \"evidence\": \"In vivo SUMOylation assays, SUMO site mutagenesis, rRNA processing analysis in human cells\",\n      \"pmids\": [\"26857222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the E3 SUMO ligase unknown\", \"Whether SUMOylation affects DSB repair or transcription functions untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing that EXOSC10 performs the first trimming step of 3'-extended human telomerase RNA (hTR) precursors — stimulated by H/ACA RNP assembly disrupting an RNA triplex — placed EXOSC10 in a defined two-step maturation pathway (EXOSC10 then PARN) for telomerase biogenesis.\",\n      \"evidence\": \"In vitro RNA processing and RNP assembly assays with RRP6/PARN depletion in human cells\",\n      \"pmids\": [\"30575725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EXOSC10 acts on hTR as part of the full exosome or independently not determined\", \"Regulation of the EXOSC10-to-PARN handoff unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The mechanistic basis for EXOSC10's DSB repair role was clarified: its RNA degradation activity clears damage-induced lncRNAs and DNA–RNA hybrids at break sites, enabling RPA loading and preventing hyper-resection, as demonstrated by RNase H1 rescue.\",\n      \"evidence\": \"siRNA depletion, dilncRNA quantification, S9.6 immunofluorescence, RPA/RAD51 ChIP, RNase H1 overexpression rescue in human cells\",\n      \"pmids\": [\"31086179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EXOSC10 degrades dilncRNAs co-transcriptionally or post-transcriptionally at breaks unknown\", \"Interplay with other nucleases at DSBs not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional knockout studies in mouse oocytes showed EXOSC10 is required for the growth-to-maturation transition, operating through mRNA surveillance of cell cycle regulators (WEE1/CDK1 axis) and endomembrane trafficking genes — extending its physiological role to meiotic cell cycle control.\",\n      \"evidence\": \"CRISPR conditional KO, single-oocyte RNA-seq, CDK1/WEE1 activity assays in mouse oocytes\",\n      \"pmids\": [\"32313933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct RNA targets of EXOSC10 in oocytes not identified by CLIP or similar\", \"Whether rRNA processing defects or mRNA dysregulation is the primary cause of meiotic arrest unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how substrates are partitioned between the Rrp6 and Dis3/Rrp44 active sites in vivo, how EXOSC10 is recruited to DNA damage sites, whether its DSB repair and transcription termination functions require core exosome association, and the structural basis for TRAMP-mediated catalytic stimulation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No CLIP-based transcriptome-wide substrate map for human EXOSC10\", \"Structural model of TRAMP–Rrp6 activation complex lacking\", \"Recruitment mechanism to DSBs uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 2, 5, 7, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [21, 22, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 11, 15]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 3, 4, 5, 16, 18, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 20]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [14, 15]}\n    ],\n    \"complexes\": [\n      \"RNA exosome (nuclear form)\",\n      \"Rrp6–Rrp47–Mtr4 module\"\n    ],\n    \"partners\": [\n      \"EXOSC1\",\n      \"C1D\",\n      \"MTREX\",\n      \"NAB2\",\n      \"RAD51\",\n      \"DROSHA\",\n      \"TRF4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"EXOSC10 is the nucleus-restricted catalytic subunit of the RNA exosome, performing distributive 3′→5′ exoribonuclease activity essential for RNA surveillance, quality control, and regulated gene expression across multiple nuclear RNA classes. Its RNase D-family active site processes rRNA precursors, snoRNAs, telomerase RNA (hTR) precursors, promoter-upstream transcripts (PROMPTs), and ARE-containing mRNAs, and it participates in nonsense-mediated mRNA decay [PMID:17174896, PMID:21705430, PMID:19056938, PMID:14527413, PMID:30575725]. EXOSC10 is recruited to the exosome core via its N-terminal PMC2NT domain, which together with cofactor Rrp47 forms a composite surface that docks the Mtr4 helicase; the TRAMP complex stimulates EXOSC10 hydrolytic activity, and cold-induced SUMO1 conjugation downregulates EXOSC10 abundance to reduce ribosome biogenesis [PMID:25319414, PMID:19955569, PMID:26857222]. Beyond RNA metabolism, EXOSC10 localizes to DNA double-strand breaks where its ribonucleolytic clearance of damage-induced lncRNAs and R-loops is required for RPA recruitment and controlled DNA end resection during homologous recombination, and conditional knockouts demonstrate essential roles in both oogenesis and spermatogenesis [PMID:31086179, PMID:25632158, PMID:32313933, PMID:29118343].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying EXOSC10 as the nuclear-specific exosome subunit established that the RNA exosome exists in functionally distinct nuclear and cytoplasmic forms, with PM/Scl-100 (RRP6) exclusively marking the nuclear complex.\",\n      \"evidence\": \"Biochemical fractionation and immunofluorescence in human cells, with genetic complementation in yeast\",\n      \"pmids\": [\"10465791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human-specific interaction partners beyond the core exosome were not identified\", \"Catalytic activity of the human protein was not directly demonstrated\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating exosome recruitment to ARE-containing mRNAs via AU-rich element binding proteins revealed that EXOSC10 functions not only in rRNA processing but in regulated mRNA turnover.\",\n      \"evidence\": \"Mass spectrometry identification of purified mammalian exosome and cell-free ARE-mRNA decay assay\",\n      \"pmids\": [\"11719186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct contribution of EXOSC10 catalytic activity versus core exosome activity on ARE substrates was not separated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linking EXOSC10 to nonsense-mediated mRNA decay expanded its role from general RNA surveillance to a specialized quality-control pathway by showing that its depletion stabilizes premature-termination-codon-containing mRNAs.\",\n      \"evidence\": \"RNAi knockdown with mRNA decay rate measurement and co-IP with Upf1/Upf2/Upf3X in human cells\",\n      \"pmids\": [\"14527413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EXOSC10 is rate-limiting for NMD versus redundant with DIS3 was not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Crystal structures of the yeast Rrp6 RNase D domain and reconstitution of multisubunit exosomes defined EXOSC10 as a distributive hydrolytic 3′→5′ exoribonuclease mechanistically distinct from the processive activities of other exosome catalytic subunits.\",\n      \"evidence\": \"X-ray crystallography of Rrp6 with product-bound complexes; in vitro reconstitution of 9-, 10-, and 11-subunit exosomes with activity assays\",\n      \"pmids\": [\"16882719\", \"17174896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human EXOSC10 structure had not yet been solved\", \"How the distributive mechanism operates on structured substrates was unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that exosome depletion uncovers PROMPTs—short polyadenylated transcripts upstream of promoters—revealed a pervasive nuclear RNA surveillance function for EXOSC10 beyond characterized coding and ribosomal substrates.\",\n      \"evidence\": \"siRNA depletion of exosome subunits in human cells with tiling microarray detection of unstable transcripts\",\n      \"pmids\": [\"19056938\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EXOSC10 catalytic activity specifically or the core exosome is responsible for PROMPT clearance was not distinguished\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reconstituting TRAMP-mediated stimulation of Rrp6 activity identified a direct enzymatic partnership: TRAMP enhances Rrp6 hydrolytic activity ~10-fold independently of its own poly(A) polymerase and helicase functions.\",\n      \"evidence\": \"In vitro assay with purified TRAMP and recombinant Rrp6, abolished by active-site mutation\",\n      \"pmids\": [\"19955569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The molecular basis of stimulation (conformational change vs. substrate delivery) was not determined\", \"Whether this mechanism is conserved for human EXOSC10 was not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Solving the human EXOSC10 crystal structure revealed a more exposed active site than the yeast ortholog, explaining its enhanced activity on structured RNA substrates and confirming the conserved RNase D mechanism.\",\n      \"evidence\": \"X-ray crystallography of human RRP6 exoribonuclease/HRDC domains with comparative in vitro exonuclease assays\",\n      \"pmids\": [\"21705430\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the full-length human EXOSC10 in complex with the exosome core was not obtained\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The exosome's association with AID at immunoglobulin switch regions revealed an unexpected role in adaptive immunity, where the exosome enables AID access to both DNA strands during class switch recombination.\",\n      \"evidence\": \"Co-IP, ChIP at IgH switch regions, and in vitro DNA deamination assay with recombinant exosome in activated B cells\",\n      \"pmids\": [\"21255825\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific catalytic contribution of EXOSC10 versus DIS3 to CSR was not delineated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that Rrp6 processes Microprocessor-generated TAR stem-loop cleavage products into small RNAs for transcriptional silencing linked EXOSC10 to RNA-mediated chromatin remodeling at the HIV-1 promoter and cellular gene targets.\",\n      \"evidence\": \"ChIP-seq, RNAi, and reporter assays at HIV-1 promoter and genome-wide cellular targets\",\n      \"pmids\": [\"22980978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EXOSC10 directly generates the small RNAs or acts on intermediates was not fully resolved\", \"Generalizability beyond HIV-associated and select cellular loci not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The crystal structure of the 10-subunit exosome (Exo9+Rrp6) with bound RNA delineated the RNA path to the EXOSC10 active site through the S1/KH ring, and the Rrp6-Rrp47-Mtr4 interface structure explained how EXOSC10 recruits the Mtr4 helicase to the complex.\",\n      \"evidence\": \"3.3 Å crystal structure of yeast Exo10-RNA; crystal structure of Rrp6-Rrp47-Mtr4 N-terminus with mutagenesis validation in yeast and human systems\",\n      \"pmids\": [\"25043052\", \"25319414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full cryo-EM structure of the complete TRAMP-exosome supercomplex with EXOSC10 was not available\", \"Kinetic partitioning of substrates between Rrp6 and Dis3 pathways was not quantified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showing that EXOSC10 is recruited to DNA double-strand breaks and that its catalytic activity is required for RAD51 recruitment extended its role from RNA metabolism to the DNA damage response and homologous recombination.\",\n      \"evidence\": \"Co-IP of EXOSC10 with RAD51, dominant-negative catalytic mutant, immunofluorescence at DSBs, and radiation sensitivity in human and Drosophila cells\",\n      \"pmids\": [\"25632158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The RNA substrate at DSBs whose clearance enables RAD51 loading was not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of cold-induced SUMO1 conjugation to EXOSC10 as a mechanism to reduce its abundance established the first post-translational regulatory pathway controlling exosome function and connecting environmental stress to ribosome biogenesis.\",\n      \"evidence\": \"SUMO site mutagenesis, SUMO1 overexpression, RNAi phenocopy of rRNA processing defects and ribosomal subunit ratio shifts\",\n      \"pmids\": [\"26857222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the SUMO E3 ligase targeting EXOSC10 was not determined\", \"Whether SUMOylation affects EXOSC10 functions beyond rRNA processing is unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reconstituting RRP6-dependent trimming of telomerase RNA precursors showed that EXOSC10 acts in the first step of a two-step hTR maturation pathway modulated by RNA tertiary structure and H/ACA RNP assembly.\",\n      \"evidence\": \"In vitro processing assays with purified RRP6 and PARN on defined hTR precursor substrates with structural analysis\",\n      \"pmids\": [\"30575725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this pathway is rate-limiting for telomerase assembly in vivo was not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mechanistic dissection of the DSB repair defect revealed that EXOSC10 clears damage-induced lncRNAs and DNA-RNA hybrids at break sites, and that failure to do so causes uncontrolled DNA end resection and loss of RPA recruitment—a defect rescued by RNase H1.\",\n      \"evidence\": \"siRNA knockdown, S9.6 antibody detection of R-loops, DNA end resection assay, RNase H1 rescue, and transcription inhibitor epistasis in human cells\",\n      \"pmids\": [\"31086179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The specific dilncRNA species targeted by EXOSC10 at breaks were not sequenced\", \"How EXOSC10 is recruited to DSBs remains unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional knockout in oocytes demonstrated that EXOSC10 sculpts the maternal transcriptome to enable germinal vesicle breakdown, linking its RNA degradation activity to CDK1 activation, nuclear lamina disassembly, endomembrane integrity, and female fertility.\",\n      \"evidence\": \"CRISPR/Cas9 conditional KO with single-oocyte RNA-seq, live-cell imaging of GVBD, and phenotypic characterization\",\n      \"pmids\": [\"32313933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct RNA targets whose degradation is rate-limiting for GVBD were not functionally validated individually\", \"Whether EXOSC10 acts independently of the core exosome in oocytes is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for substrate partitioning between EXOSC10 and DIS3 within the intact nuclear exosome, the mechanism by which EXOSC10 is recruited to DNA damage sites, and whether its roles in gametogenesis and DNA repair require core-exosome association or reflect exosome-independent functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full structural model of human nuclear exosome with both catalytic subunits and substrates\", \"Recruitment mechanism of EXOSC10 to DSBs undefined\", \"Exosome-dependent versus independent functions in germ cells not separated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [3, 4, 7, 8, 13, 18]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 8, 13]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 15, 17]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 2, 5, 6, 7, 12, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [15, 19]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\n      \"RNA exosome (nuclear form)\",\n      \"TRAMP complex (functional partner)\"\n    ],\n    \"partners\": [\n      \"RRP47\",\n      \"MTR4\",\n      \"DIS3\",\n      \"EXOSC3\",\n      \"RAD51\",\n      \"UPF1\",\n      \"DROSHA\",\n      \"PARN\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}