{"gene":"EXOSC3","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2012,"finding":"Loss-of-function mutations in EXOSC3 (encoding exosome component 3, a core subunit of the RNA exosome) cause pontocerebellar hypoplasia type 1 (PCH1) with spinal motor neuron degeneration; morpholino knockdown of exosc3 in zebrafish caused small brain size and poor motility that were rescued by co-injection with wild-type but not mutant exosc3 mRNA, establishing a causal role for EXOSC3 in cerebellar and motor neuron development through RNA processing.","method":"Exome sequencing of affected families; morpholino knockdown in zebrafish with mRNA rescue experiments","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — zebrafish loss-of-function with specific phenotypic readout and mutant-vs-wild-type mRNA rescue; replicated across multiple families","pmids":["22544365"],"is_preprint":false},{"year":2006,"finding":"The yeast ortholog of EXOSC3, Rrp40p, adopts a structure comprising an S1 domain and an unusual KH domain whose close packing is stabilized by a conserved GxNG sequence unique to exosome KH domains; NMR revealed a manganese-binding site at the S1-KH domain interface; ITC showed Rrp40 alone has very low intrinsic RNA affinity, but the archaeal Rrp4 (functional equivalent) significantly increases core exosome RNA affinity, indicating cooperative RNA binding involving multiple subunits.","method":"X-ray crystallography (2.2 Å resolution); NMR spectroscopy; isothermal titration calorimetry (ITC)","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus NMR and ITC in a single rigorous study; multiple orthogonal methods","pmids":["17159918"],"is_preprint":false},{"year":2017,"finding":"Disease-associated mutations in EXOSC3/Rrp40p (G31A/G8A, G191C/G148C, W238R/W195R in human/yeast numbering) preferentially impair pre-ribosomal RNA processing functions of the exosome rather than other nuclear RNA processing or surveillance functions in S. cerevisiae, with severity of yeast phenotypes correlating with clinical severity in patients; the W195R (W238R human) mutant showed the strongest growth and rRNA processing defects.","method":"Yeast genetics — introduction of PCH1-associated mutations into S. cerevisiae Rrp40p; growth assays; RNA processing analysis by Northern blot","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic system with defined RNA processing readouts; single lab but multiple mutant alleles and orthogonal phenotypic assays","pmids":["28053271"],"is_preprint":false},{"year":2017,"finding":"In patient fibroblasts carrying the EXOSC3 p.D132A mutation, a large portion of the EXOSC3 protein was trapped in the cytosol rather than being in the nucleus/exosome complex, indicating that this disease mutation disrupts correct subcellular localization of EXOSC3; RNA-seq of patient muscle showed highly increased mRNA levels (especially OXPHOS complex subunit mRNAs), consistent with reduced RNA degradation by a dysfunctional exosome.","method":"Subcellular fractionation of patient fibroblasts; RNA-seq of patient muscle; whole exome sequencing","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct fractionation experiment in patient-derived cells with functional RNA-seq readout; single lab, single patient","pmids":["28687512"],"is_preprint":false}],"current_model":"EXOSC3 encodes a core structural subunit of the RNA exosome complex whose S1 and KH domains (crystal structure resolved at 2.2 Å) contribute to cooperative RNA substrate binding; it is required for pre-ribosomal RNA processing and broader RNA surveillance, and disease-causing mutations either mislocalise the protein to the cytosol or specifically impair rRNA processing functions, leading to pontocerebellar hypoplasia with spinal motor neuron degeneration."},"narrative":{"mechanistic_narrative":"EXOSC3 is a core subunit of the RNA exosome that supports RNA processing and surveillance and is essential for cerebellar and spinal motor neuron development [PMID:22544365]. Structural and biophysical analysis of its yeast ortholog Rrp40p resolved an S1 domain and an atypical KH domain stabilized by a conserved exosome-specific GxNG sequence, with a manganese-binding site at the S1-KH interface; the subunit alone binds RNA only weakly but cooperates with other cap subunits to raise the RNA affinity of the assembled core, establishing EXOSC3's role as a contributor to cooperative substrate engagement rather than an autonomous RNA-binder [PMID:17159918]. Among the exosome's activities, EXOSC3 is selectively required for pre-ribosomal RNA processing: disease mutations engineered into yeast Rrp40p preferentially impair rRNA processing over other nuclear surveillance functions, and yeast phenotype severity tracks with clinical severity, the W238R/W195R allele being the most damaging [PMID:28053271]. Distinct disease mutations act through distinct molecular routes — the p.D132A mutation mislocalizes EXOSC3 to the cytosol away from the nuclear exosome, and patient muscle shows broadly elevated mRNA levels consistent with reduced exosome-mediated RNA degradation [PMID:28687512]. Loss-of-function mutations in EXOSC3 cause pontocerebellar hypoplasia type 1 with spinal motor neuron degeneration [PMID:22544365].","teleology":[{"year":2006,"claim":"Resolving how the Rrp40p cap subunit is built and how it engages RNA established the structural basis for EXOSC3's contribution to exosome substrate binding, answering whether it binds RNA on its own.","evidence":"X-ray crystallography (2.2 Å), NMR, and ITC on yeast Rrp40p/archaeal core","pmids":["17159918"],"confidence":"High","gaps":["Functional role of the manganese-binding site at the S1-KH interface not defined","Cooperative binding shown in archaeal/yeast system, not in the human complex","Specific RNA substrates contacted by EXOSC3 not identified"]},{"year":2012,"claim":"Linking EXOSC3 loss-of-function to disease and demonstrating mRNA rescue established a causal requirement for the gene in cerebellar and motor neuron development via RNA processing.","evidence":"Exome sequencing of PCH1 families plus zebrafish morpholino knockdown with wild-type vs mutant mRNA rescue","pmids":["22544365"],"confidence":"High","gaps":["Molecular pathway connecting exosome dysfunction to neuron-specific degeneration not defined","Why neurons are selectively vulnerable not addressed","Which RNA substrates underlie the phenotype not identified"]},{"year":2017,"claim":"Modeling patient mutations in yeast showed EXOSC3 disease alleles preferentially cripple pre-rRNA processing rather than general surveillance, isolating the functional defect most relevant to disease.","evidence":"PCH1 mutations introduced into S. cerevisiae Rrp40p; growth assays and Northern-blot RNA processing analysis","pmids":["28053271"],"confidence":"Medium","gaps":["Single lab; selectivity for rRNA processing shown in yeast, not human cells","Mechanism by which each mutation impairs processing not resolved","Genotype-phenotype correlation is qualitative"]},{"year":2017,"claim":"Examining patient cells revealed a distinct mutational mechanism — cytosolic mislocalization of EXOSC3 — and showed the functional consequence of impaired exosome activity on the transcriptome.","evidence":"Subcellular fractionation of p.D132A patient fibroblasts and RNA-seq of patient muscle","pmids":["28687512"],"confidence":"Medium","gaps":["Single patient, single lab; mislocalization mechanism not defined","Whether elevated OXPHOS mRNAs are direct exosome substrates not established","Generalizability across other EXOSC3 alleles unknown"]},{"year":null,"claim":"How exosome/EXOSC3 dysfunction produces selective pontocerebellar and motor neuron degeneration, and which specific RNA substrates drive this, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified RNA substrate links exosome dysfunction to neuronal death","Tissue-selective vulnerability unexplained","Human structural model of EXOSC3 within the assembled exosome not characterized in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,3]}],"complexes":["RNA exosome"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NQT5","full_name":"Exosome complex component RRP40","aliases":["Exosome component 3","Ribosomal RNA-processing protein 40","p10"],"length_aa":275,"mass_kda":29.6,"function":"Non-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. 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. The catalytic inactive RNA exosome core complex of 9 subunits (Exo-9) is proposed to play a pivotal role in the binding and presentation of RNA for ribonucleolysis, and to serve as a scaffold for the association with catalytic subunits and accessory proteins or complexes. EXOSC3 as peripheral part of the Exo-9 complex stabilizes the hexameric ring of RNase PH-domain subunits through contacts with EXOSC9 and EXOSC5","subcellular_location":"Cytoplasm; Nucleus, nucleolus; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9NQT5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/EXOSC3","classification":"Common Essential","n_dependent_lines":1195,"n_total_lines":1208,"dependency_fraction":0.9892384105960265},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DRG1","stoichiometry":0.2},{"gene":"G3BP2","stoichiometry":0.2},{"gene":"NPM1","stoichiometry":0.2},{"gene":"RACK1","stoichiometry":0.2},{"gene":"SRP68","stoichiometry":0.2},{"gene":"TPT1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/EXOSC3","total_profiled":1310},"omim":[{"mim_id":"616081","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 1C; PCH1C","url":"https://www.omim.org/entry/616081"},{"mim_id":"614678","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 1B; PCH1B","url":"https://www.omim.org/entry/614678"},{"mim_id":"607596","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 1A; PCH1A","url":"https://www.omim.org/entry/607596"},{"mim_id":"606489","title":"EXOSOME COMPONENT 3; EXOSC3","url":"https://www.omim.org/entry/606489"},{"mim_id":"606019","title":"EXOSOME COMPONENT 8; EXOSC8","url":"https://www.omim.org/entry/606019"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EXOSC3"},"hgnc":{"alias_symbol":["hRrp40p","Rrp40p","RRP40","CGI-102","p10","hRrp-40"],"prev_symbol":[]},"alphafold":{"accession":"Q9NQT5","domains":[{"cath_id":"2.40.50.100","chopping":"19-40_64-104","consensus_level":"high","plddt":84.1232,"start":19,"end":104},{"cath_id":"2.40.50.140","chopping":"116-193","consensus_level":"high","plddt":90.7441,"start":116,"end":193},{"cath_id":"3.30.1370.10","chopping":"199-275","consensus_level":"high","plddt":85.644,"start":199,"end":275}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQT5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQT5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQT5-F1-predicted_aligned_error_v6.png","plddt_mean":79.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EXOSC3","jax_strain_url":"https://www.jax.org/strain/search?query=EXOSC3"},"sequence":{"accession":"Q9NQT5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NQT5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NQT5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQT5"}},"corpus_meta":[{"pmid":"2415974","id":"PMC_2415974","title":"Amino-terminal 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role for EXOSC3 in cerebellar and motor neuron development through RNA processing.\",\n      \"method\": \"Exome sequencing of affected families; morpholino knockdown in zebrafish with mRNA rescue experiments\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — zebrafish loss-of-function with specific phenotypic readout and mutant-vs-wild-type mRNA rescue; replicated across multiple families\",\n      \"pmids\": [\"22544365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The yeast ortholog of EXOSC3, Rrp40p, adopts a structure comprising an S1 domain and an unusual KH domain whose close packing is stabilized by a conserved GxNG sequence unique to exosome KH domains; NMR revealed a manganese-binding site at the S1-KH domain interface; ITC showed Rrp40 alone has very low intrinsic RNA affinity, but the archaeal Rrp4 (functional equivalent) significantly increases core exosome RNA affinity, indicating cooperative RNA binding involving multiple subunits.\",\n      \"method\": \"X-ray crystallography (2.2 Å resolution); NMR spectroscopy; isothermal titration calorimetry (ITC)\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus NMR and ITC in a single rigorous study; multiple orthogonal methods\",\n      \"pmids\": [\"17159918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Disease-associated mutations in EXOSC3/Rrp40p (G31A/G8A, G191C/G148C, W238R/W195R in human/yeast numbering) preferentially impair pre-ribosomal RNA processing functions of the exosome rather than other nuclear RNA processing or surveillance functions in S. cerevisiae, with severity of yeast phenotypes correlating with clinical severity in patients; the W195R (W238R human) mutant showed the strongest growth and rRNA processing defects.\",\n      \"method\": \"Yeast genetics — introduction of PCH1-associated mutations into S. cerevisiae Rrp40p; growth assays; RNA processing analysis by Northern blot\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic system with defined RNA processing readouts; single lab but multiple mutant alleles and orthogonal phenotypic assays\",\n      \"pmids\": [\"28053271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In patient fibroblasts carrying the EXOSC3 p.D132A mutation, a large portion of the EXOSC3 protein was trapped in the cytosol rather than being in the nucleus/exosome complex, indicating that this disease mutation disrupts correct subcellular localization of EXOSC3; RNA-seq of patient muscle showed highly increased mRNA levels (especially OXPHOS complex subunit mRNAs), consistent with reduced RNA degradation by a dysfunctional exosome.\",\n      \"method\": \"Subcellular fractionation of patient fibroblasts; RNA-seq of patient muscle; whole exome sequencing\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct fractionation experiment in patient-derived cells with functional RNA-seq readout; single lab, single patient\",\n      \"pmids\": [\"28687512\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EXOSC3 encodes a core structural subunit of the RNA exosome complex whose S1 and KH domains (crystal structure resolved at 2.2 Å) contribute to cooperative RNA substrate binding; it is required for pre-ribosomal RNA processing and broader RNA surveillance, and disease-causing mutations either mislocalise the protein to the cytosol or specifically impair rRNA processing functions, leading to pontocerebellar hypoplasia with spinal motor neuron degeneration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EXOSC3 is a core subunit of the RNA exosome that supports RNA processing and surveillance and is essential for cerebellar and spinal motor neuron development [#0]. Structural and biophysical analysis of its yeast ortholog Rrp40p resolved an S1 domain and an atypical KH domain stabilized by a conserved exosome-specific GxNG sequence, with a manganese-binding site at the S1-KH interface; the subunit alone binds RNA only weakly but cooperates with other cap subunits to raise the RNA affinity of the assembled core, establishing EXOSC3's role as a contributor to cooperative substrate engagement rather than an autonomous RNA-binder [#1]. Among the exosome's activities, EXOSC3 is selectively required for pre-ribosomal RNA processing: disease mutations engineered into yeast Rrp40p preferentially impair rRNA processing over other nuclear surveillance functions, and yeast phenotype severity tracks with clinical severity, the W238R/W195R allele being the most damaging [#2]. Distinct disease mutations act through distinct molecular routes \\u2014 the p.D132A mutation mislocalizes EXOSC3 to the cytosol away from the nuclear exosome, and patient muscle shows broadly elevated mRNA levels consistent with reduced exosome-mediated RNA degradation [#3]. Loss-of-function mutations in EXOSC3 cause pontocerebellar hypoplasia type 1 with spinal motor neuron degeneration [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolving how the Rrp40p cap subunit is built and how it engages RNA established the structural basis for EXOSC3's contribution to exosome substrate binding, answering whether it binds RNA on its own.\",\n      \"evidence\": \"X-ray crystallography (2.2 \\u00c5), NMR, and ITC on yeast Rrp40p/archaeal core\",\n      \"pmids\": [\"17159918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional role of the manganese-binding site at the S1-KH interface not defined\",\n        \"Cooperative binding shown in archaeal/yeast system, not in the human complex\",\n        \"Specific RNA substrates contacted by EXOSC3 not identified\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linking EXOSC3 loss-of-function to disease and demonstrating mRNA rescue established a causal requirement for the gene in cerebellar and motor neuron development via RNA processing.\",\n      \"evidence\": \"Exome sequencing of PCH1 families plus zebrafish morpholino knockdown with wild-type vs mutant mRNA rescue\",\n      \"pmids\": [\"22544365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular pathway connecting exosome dysfunction to neuron-specific degeneration not defined\",\n        \"Why neurons are selectively vulnerable not addressed\",\n        \"Which RNA substrates underlie the phenotype not identified\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Modeling patient mutations in yeast showed EXOSC3 disease alleles preferentially cripple pre-rRNA processing rather than general surveillance, isolating the functional defect most relevant to disease.\",\n      \"evidence\": \"PCH1 mutations introduced into S. cerevisiae Rrp40p; growth assays and Northern-blot RNA processing analysis\",\n      \"pmids\": [\"28053271\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; selectivity for rRNA processing shown in yeast, not human cells\",\n        \"Mechanism by which each mutation impairs processing not resolved\",\n        \"Genotype-phenotype correlation is qualitative\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Examining patient cells revealed a distinct mutational mechanism \\u2014 cytosolic mislocalization of EXOSC3 \\u2014 and showed the functional consequence of impaired exosome activity on the transcriptome.\",\n      \"evidence\": \"Subcellular fractionation of p.D132A patient fibroblasts and RNA-seq of patient muscle\",\n      \"pmids\": [\"28687512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single patient, single lab; mislocalization mechanism not defined\",\n        \"Whether elevated OXPHOS mRNAs are direct exosome substrates not established\",\n        \"Generalizability across other EXOSC3 alleles unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How exosome/EXOSC3 dysfunction produces selective pontocerebellar and motor neuron degeneration, and which specific RNA substrates drive this, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No identified RNA substrate links exosome dysfunction to neuronal death\",\n        \"Tissue-selective vulnerability unexplained\",\n        \"Human structural model of EXOSC3 within the assembled exosome not characterized in the corpus\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"complexes\": [\"RNA exosome\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}