{"gene":"POLR3G","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1995,"finding":"The C31 subunit of yeast RNA polymerase III is part of a three-subunit complex (C31, C34, C82) specific to Pol III. A conditional truncation of the acidic C-terminus of C31 impairs transcription initiation of tRNA genes in the presence of general initiation factors (TFIIIB), but not non-specific transcription or termination/recycling. Overexpression of the largest Pol III subunit C160 suppresses the C31 C-terminal deletion, suggesting a functional interaction between C160 and C31.","method":"Genetic truncation/deletion mutagenesis in S. cerevisiae, in vivo tRNA transcription assay, in vitro transcription assay with/without initiation factors, suppressor overexpression screen","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with defined factors, genetic epistasis by suppressor overexpression, multiple orthogonal methods in one study","pmids":["7835345"],"is_preprint":false},{"year":2013,"finding":"POLR3G and POLR3GL arose from a DNA-based gene duplication in a common ancestor of vertebrates. Both POLR3G- and POLR3GL-containing Pol III complexes occupy the same target genes genome-wide in constant proportions within a cell line. POLR3G-containing Pol III is relatively more abundant in dividing cells. The POLR3G promoter (but not POLR3GL) binds the transcription factor MYC, indicating neo-functionalization at the level of transcriptional regulation rather than target-gene specificity.","method":"Genome-wide ChIP-seq for both Pol III isoforms, promoter binding assay for MYC, quantitative comparison in dividing vs. non-dividing cells","journal":"Genome research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq with genome-wide resolution, MYC promoter binding assay, replicated across cell lines and tissues","pmids":["24107381"],"is_preprint":false},{"year":2011,"finding":"POLR3G is required for maintenance of pluripotency in human embryonic stem cells (hESCs). Knockdown of POLR3G via inducible shRNA causes loss of pluripotency and promotes differentiation to all three germ layers without affecting apoptosis. POLR3G is a downstream transcriptional target of OCT4 and NANOG. POLR3G expression is regulated by the ERK1/2 signaling pathway.","method":"Inducible shRNA lentiviral knockdown in hESCs, differentiation assays, overexpression experiments, pharmacological inhibition of ERK1/2, reporter/ChIP analysis linking OCT4/NANOG to POLR3G promoter","journal":"Stem cells (Dayton, Ohio)","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with defined cellular phenotype, pathway placement via pharmacological intervention, transcription factor regulation confirmed, multiple orthogonal methods","pmids":["21898682"],"is_preprint":false},{"year":2020,"finding":"POLR3G- and POLR3GL-containing Pol III complexes bind the same target genes and perform the same functions both in vitro and in vivo. POLR3G can functionally substitute for POLR3GL and vice versa in vivo; a differentiation defect in POLR3G-knockout ESCs is rescued by exogenous POLR3GL expression. POLR3G knockout mice die at a very early embryonic stage, while POLR3GL knockout mice survive embryogenesis but die ~3 weeks after birth with growth and potential cerebellar neuronal defects, reflecting differential expression levels across developmental stages.","method":"Conditional and complete knockout mouse models, ESC differentiation rescue assay, in vitro transcription assays, ChIP-seq for target gene occupancy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple knockout models, in vitro reconstitution, rescue experiment, genome-wide ChIP-seq, rigorous in vivo phenotyping","pmids":["32576691"],"is_preprint":false},{"year":2017,"finding":"POLR3G regulates a specific subset of the hPSC transcriptome, including protein-coding genes, lincRNAs, microRNAs, and snoRNAs, and affects RNA splicing. The primary function of POLR3G is in maintenance rather than repression of transcription. Among direct POLR3G targets, POLG (mitochondrial DNA polymerase gamma) is identified as potentially important for sustaining stem cell status.","method":"Deep-sequencing of polyA+ and smallRNA transcriptomes in POLR3G-knockdown hPSCs, bioinformatic analysis of splicing changes and promoter binding by pluripotency factors","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — deep sequencing with knockdown, single lab, transcriptomic but with defined target gene identification","pmids":["28494942"],"is_preprint":false},{"year":2019,"finding":"During skeletal muscle differentiation in Xenopus, the Polr3g isoform is expressed early in the myogenic lineage and its forced expression partially reverses myogenic differentiation. Pol III-dependent transcripts (including specific tRNA isoacceptors) are dramatically downregulated during skeletal muscle differentiation, with differential activity of Polr3g vs. Polr3gL isoforms on specific tRNA isoacceptors demonstrated by custom tRNA microarray.","method":"Custom tRNA microarray in Xenopus embryos and muscle differentiation models, forced Polr3g overexpression with myogenic differentiation readout, developmental expression profiling","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with defined phenotype, tRNA microarray, single lab with multiple methods","pmids":["31173763"],"is_preprint":false},{"year":2022,"finding":"POLR3G knockout in the MDA-MB231 triple-negative breast cancer (TNBC) cell line dramatically reduces anchorage-independent growth and invasive capabilities in vitro and impairs tumor growth and metastasis formation in orthotopic xenografts in mice. POLR3G KO induces expression of the pioneer transcription factor FOXA1 and androgen receptor in TNBC but does not alter EMT marker gene expression or proliferation.","method":"CRISPR/POLR3G KO in TNBC cell line, in vitro invasion/anchorage-independent growth assays, orthotopic xenograft mouse model, gene expression analysis","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined in vitro and in vivo phenotypes, multiple readouts, single lab","pmids":["36497214"],"is_preprint":false},{"year":2023,"finding":"POLR3G promotes epithelial-mesenchymal transition (EMT) and invasiveness of bladder cancer cells via activation of the PI3K/AKT signaling pathway. POLR3G knockdown reduces migration and invasion and downregulates mesenchymal markers; these effects are rescued by PI3K/AKT pathway activator 740Y-P, and POLR3G overexpression-enhanced invasion is blocked by PI3K inhibitor LY294002.","method":"POLR3G knockdown and overexpression in bladder cancer cell lines, in vitro migration/invasion assays, in vivo xenograft, PI3K inhibitor/activator pharmacological rescue experiments, Western blot of EMT markers","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD/OE with pharmacological pathway rescue, multiple in vitro and in vivo readouts, single lab","pmids":["37933949"],"is_preprint":false},{"year":2023,"finding":"POLR3G expression in cancer is positively regulated by a gene-internal super-enhancer bound by multiple transcription factors including ZNF131, ZNF207, and MYC, and negatively regulated by gene-internal DNA methylation, retinoic-acid-induced differentiation, and MXD4. MXD4 likely disrupts MYC-driven POLR3G expression. Histone demethylase KDM5B is identified as a likely additional influencer of POLR3G gene activity.","method":"Genomic survey of mRNA and chromatin signatures; functional TF overexpression/knockdown experiments validating ZNF131, ZNF207, and MXD4 effects on POLR3G expression; chromatin architecture analysis","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional TF validation experiments, multiple genomic methods, single lab","pmids":["37894362"],"is_preprint":false},{"year":2023,"finding":"miR-26a-5p directly targets and downregulates POLR3G mRNA in lung cancer cells, suppressing cancer stemness (colony and sphere formation) and increasing chemosensitivity to paclitaxel.","method":"miR-26a-5p overexpression in lung cancer cell lines, colony and sphere formation assays, co-treatment with paclitaxel, luciferase or direct binding assay for miR-26a-5p targeting POLR3G","journal":"Non-coding RNA research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, functional assay with miRNA overexpression but limited mechanistic depth on POLR3G itself","pmids":["36949748"],"is_preprint":false},{"year":2024,"finding":"POLR3G knockdown in bladder cancer cells inhibits the Wnt signaling pathway, as evidenced by downregulation of Wnt5a/b, DVL2, LRP-6, and phosphorylated LRP-6, suggesting POLR3G influences bladder cancer cell behavior through Wnt signaling.","method":"POLR3G knockdown in bladder cancer cell lines, RNA sequencing with enrichment analysis, Western blotting for Wnt pathway components","journal":"European journal of medical research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, KD with pathway protein measurement but no direct mechanistic link established","pmids":["39039528"],"is_preprint":false}],"current_model":"POLR3G (RPC7α/C31/RPC32) encodes a subunit unique to one of two isoforms of RNA polymerase III; it forms part of the Pol III-specific C31/C34/C82 subcomplex that is required for transcription initiation on tRNA genes via interaction with TFIIIB, with both POLR3G-containing Pol III and the POLR3GL-containing form occupying identical genomic target genes but being differentially regulated—POLR3G expression is driven by MYC and a super-enhancer, is enriched in embryonic stem cells and cancer cells, is required for pluripotency maintenance downstream of OCT4/NANOG, and promotes EMT and invasiveness in cancer through PI3K/AKT and Wnt signaling pathways."},"narrative":{"mechanistic_narrative":"POLR3G encodes a subunit of one of two alternative isoforms of RNA polymerase III, functioning within the Pol III-specific three-subunit module (C31/C34/C82) required for transcription initiation on tRNA genes through interaction with the general initiation machinery; in yeast the orthologous C31 subunit is essential for initiation but not for non-specific transcription or termination/recycling, and it functionally interacts with the largest Pol III subunit C160 [PMID:7835345]. POLR3G arose by gene duplication from POLR3GL in a vertebrate ancestor, and the two paralog-containing Pol III complexes occupy identical target genes genome-wide and are mutually substitutable, with their divergence resting at the level of transcriptional regulation rather than target-gene specificity—POLR3G expression is MYC-driven and enriched in dividing cells [PMID:24107381, PMID:32576691]. POLR3G maintains pluripotency in human embryonic stem cells as a downstream target of OCT4 and NANOG, where its loss drives differentiation to all three germ layers, and it sustains a defined subset of the stem-cell transcriptome including protein-coding genes, lincRNAs, microRNAs, and snoRNAs [PMID:21898682, PMID:28494942]. POLR3G is essential in development: its knockout causes very early embryonic lethality in mice, whereas the differentiation defect of POLR3G-null ESCs is rescued by exogenous POLR3GL [PMID:32576691]. In cancer, POLR3G expression is driven by an internal super-enhancer bound by MYC, ZNF131, and ZNF207 and restrained by DNA methylation and MXD4, and it promotes invasiveness and metastasis in triple-negative breast and bladder cancer models via PI3K/AKT signaling [PMID:36497214, PMID:37933949, PMID:37894362].","teleology":[{"year":1995,"claim":"Established that the C31 subunit (POLR3G ortholog) is a dedicated component of a Pol III-specific subcomplex required for the initiation step of tRNA gene transcription, distinguishing its role from general transcription and recycling.","evidence":"Genetic truncation mutagenesis and in vitro/in vivo transcription assays with defined initiation factors in S. cerevisiae, plus a suppressor overexpression screen","pmids":["7835345"],"confidence":"High","gaps":["Structural basis of the C31-C160 interaction not resolved","Does not address the vertebrate-specific POLR3G/POLR3GL paralog divergence"]},{"year":2011,"claim":"Showed POLR3G is a transcriptional target of the core pluripotency factors OCT4/NANOG and is required to maintain the undifferentiated state, placing a Pol III subunit within the pluripotency regulatory network.","evidence":"Inducible shRNA knockdown in hESCs with differentiation assays, ERK1/2 pharmacological inhibition, and promoter regulation analysis","pmids":["21898682"],"confidence":"High","gaps":["Mechanism linking a general Pol III subunit to a specific pluripotency program not defined","Whether the effect operates through Pol III catalytic output or a moonlighting role unclear"]},{"year":2013,"claim":"Resolved why two Pol III isoforms exist by showing POLR3G and POLR3GL complexes occupy the same genes in fixed proportions, locating their functional divergence in differential transcriptional regulation (MYC binds the POLR3G promoter) rather than target specificity.","evidence":"Genome-wide ChIP-seq for both isoforms and MYC promoter binding assays across cell lines","pmids":["24107381"],"confidence":"High","gaps":["Functional consequence of isoform swap on individual genes not yet tested","Why dividing cells preferentially use POLR3G unexplained"]},{"year":2017,"claim":"Defined the breadth of the POLR3G-dependent transcriptome in pluripotent cells, showing it maintains expression of a specific gene subset across multiple RNA classes and identifying candidate effectors such as POLG.","evidence":"Deep sequencing of polyA+ and small RNA transcriptomes in POLR3G-knockdown hPSCs with splicing and promoter binding analysis","pmids":["28494942"],"confidence":"Medium","gaps":["Direct versus indirect targets not fully separated","Single-lab transcriptomic study without orthogonal validation of effector genes"]},{"year":2019,"claim":"Demonstrated isoform-specific Pol III activity on distinct tRNA isoacceptors and a role for Polr3g in opposing terminal differentiation in a developmental (myogenic) context.","evidence":"Custom tRNA microarray and forced Polr3g overexpression with myogenic readouts in Xenopus","pmids":["31173763"],"confidence":"Medium","gaps":["Mechanism of isoacceptor selectivity unknown","Relevance to mammalian muscle not established"]},{"year":2020,"claim":"Established functional redundancy between the paralogs at the protein level while revealing distinct organismal requirements driven by differential developmental expression: POLR3G loss is embryonic lethal and POLR3GL can rescue the POLR3G-null ESC defect.","evidence":"Knockout mouse models, ESC differentiation rescue assays, in vitro transcription, and ChIP-seq","pmids":["32576691"],"confidence":"High","gaps":["Basis of the early-embryonic essentiality not mechanistically dissected","What sets the stage-specific expression ratio remains unknown"]},{"year":2022,"claim":"Provided in vivo evidence that POLR3G drives the malignant phenotype, with knockout suppressing invasion and metastasis in a triple-negative breast cancer model and derepressing FOXA1 and androgen receptor.","evidence":"CRISPR knockout in TNBC cells with in vitro invasion assays and orthotopic xenografts","pmids":["36497214"],"confidence":"Medium","gaps":["How a Pol III subunit controls FOXA1/AR expression not explained","EMT markers and proliferation were unchanged, leaving the invasion mechanism open"]},{"year":2023,"claim":"Identified the cis- and trans-regulatory architecture controlling oncogenic POLR3G expression and connected POLR3G to a defined pro-invasive signaling axis.","evidence":"Genomic chromatin survey with TF over/knockdown validation (ZNF131, ZNF207, MXD4); separate KD/OE bladder cancer study with PI3K/AKT pharmacological rescue (740Y-P, LY294002)","pmids":["37894362","37933949"],"confidence":"Medium","gaps":["Direct link from Pol III transcriptional output to PI3K/AKT activation not established","Whether super-enhancer regulation operates in normal stem cells unclear"]},{"year":2023,"claim":"Linked POLR3G to cancer stemness and chemoresistance through a miRNA regulatory input.","evidence":"miR-26a-5p overexpression with colony/sphere formation, paclitaxel co-treatment, and direct binding assay in lung cancer cells","pmids":["36949748"],"confidence":"Low","gaps":["Limited mechanistic depth on POLR3G itself beyond being a miRNA target","Single-lab functional study without independent confirmation"]},{"year":2024,"claim":"Associated POLR3G with Wnt pathway activity in bladder cancer based on co-regulation of pathway components.","evidence":"POLR3G knockdown with RNA-seq enrichment and Western blot of Wnt5a/b, DVL2, LRP-6","pmids":["39039528"],"confidence":"Low","gaps":["No direct mechanistic link between POLR3G and Wnt components established","Correlative protein measurements only"]},{"year":null,"claim":"It remains unknown how a shared, redundant Pol III catalytic subunit produces isoform-specific outputs that determine pluripotency, developmental essentiality, and cancer invasiveness.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism connecting Pol III transcriptional output to PI3K/AKT, Wnt, or FOXA1/AR regulation","Structural basis for POLR3G vs POLR3GL functional equivalence within Pol III not resolved","Determinants of the stage- and tissue-specific POLR3G/POLR3GL expression ratio unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,3,5]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,3]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,7]}],"complexes":["RNA polymerase III"],"partners":["POLR3GL","MYC","ZNF131","ZNF207","MXD4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15318","full_name":"DNA-directed RNA polymerase III subunit RPC7","aliases":["DNA-directed RNA polymerase III subunit G","RNA polymerase III 32 kDa apha subunit","RPC32-alpha","RNA polymerase III 32 kDa subunit","RPC32"],"length_aa":223,"mass_kda":25.9,"function":"DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates (PubMed:20413673, PubMed:33558764, PubMed:34675218, PubMed:35637192). Specific peripheric component of RNA polymerase III (Pol III) which synthesizes small non-coding RNAs including 5S rRNA, snRNAs, tRNAs and miRNAs from at least 500 distinct genomic loci (PubMed:20154270, PubMed:20413673, PubMed:35637192). Acts as a long tether that bridges POLR3C/RPC3-POLR3F/RPC6-POLR3G/RPC7 heterotrimer and the mobile stalk of Pol III, coordinating the dynamics of Pol III stalk and clamp modules during the transition from apo to elongation state. Pol III exists as two alternative complexes defined by the mutually exclusive incorporation of subunit POLR3G/RPC7alpha or POLR3GL/RPC7beta. POLR3G/RPC7alpha modulates Pol III transcriptome by specifically enhancing the transcription of snaR-A non-coding RNAs. At resting state, occupies the active site of apo Pol III and keeps Pol III in an autoinhibitory mode, preventing non-specific transcription (PubMed:33558764, PubMed:33558766, PubMed:35637192). Pol III plays a key role in sensing and limiting infection by intracellular bacteria and DNA viruses. Acts as a nuclear and cytosolic DNA sensor involved in innate immune response. Can sense non-self dsDNA that serves as template for transcription into dsRNA. The non-self RNA polymerase III transcripts, such as Epstein-Barr virus-encoded RNAs (EBERs), induce type I interferon and NF-kappa-B through the RIG-I pathway (PubMed:19609254, PubMed:19631370)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O15318/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/POLR3G","classification":"Not Classified","n_dependent_lines":15,"n_total_lines":1208,"dependency_fraction":0.012417218543046357},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000113356","cell_line_id":"CID000715","localizations":[{"compartment":"nuclear_punctae","grade":3},{"compartment":"nucleoplasm","grade":2}],"interactors":[{"gene":"POLR1C","stoichiometry":10.0},{"gene":"POLR1D","stoichiometry":10.0},{"gene":"POLR2E","stoichiometry":10.0},{"gene":"POLR2F","stoichiometry":10.0},{"gene":"POLR2H","stoichiometry":10.0},{"gene":"POLR2K","stoichiometry":10.0},{"gene":"POLR3A","stoichiometry":10.0},{"gene":"POLR3B","stoichiometry":10.0},{"gene":"POLR3C","stoichiometry":10.0},{"gene":"POLR3D","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000715","total_profiled":1310},"omim":[{"mim_id":"617457","title":"POLYMERASE III, RNA, SUBUNIT G-LIKE; POLR3GL","url":"https://www.omim.org/entry/617457"},{"mim_id":"617456","title":"POLYMERASE III, RNA, SUBUNIT G; POLR3G","url":"https://www.omim.org/entry/617456"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/POLR3G"},"hgnc":{"alias_symbol":["RPC32","RPC7","C31"],"prev_symbol":[]},"alphafold":{"accession":"O15318","domains":[{"cath_id":"-","chopping":"48-76_90-101","consensus_level":"medium","plddt":87.8922,"start":48,"end":101}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15318","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15318-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15318-F1-predicted_aligned_error_v6.png","plddt_mean":67.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=POLR3G","jax_strain_url":"https://www.jax.org/strain/search?query=POLR3G"},"sequence":{"accession":"O15318","fasta_url":"https://rest.uniprot.org/uniprotkb/O15318.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15318/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15318"}},"corpus_meta":[{"pmid":"7972041","id":"PMC_7972041","title":"Prostate and mammary 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candidates.","date":"2024","source":"International journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/39559319","citation_count":0,"is_preprint":false},{"pmid":"41639863","id":"PMC_41639863","title":"APP-C31 pathology as a target in neurodegenerative diseases.","date":"2026","source":"Journal of biomedical science","url":"https://pubmed.ncbi.nlm.nih.gov/41639863","citation_count":0,"is_preprint":false},{"pmid":"6289084","id":"PMC_6289084","title":"[Physical mapping of actinophage Streptomyces coelicolor A3(2). VI. The use of deletion mutants of actinophage phi C31 for construction of phage vectors].","date":"1982","source":"Molekuliarnaia biologiia","url":"https://pubmed.ncbi.nlm.nih.gov/6289084","citation_count":0,"is_preprint":false},{"pmid":"6291223","id":"PMC_6291223","title":"[Extraction and freeze-drying of herpes virus C3-1 isolated from turkeys].","date":"1982","source":"Veterinarno-meditsinski nauki","url":"https://pubmed.ncbi.nlm.nih.gov/6291223","citation_count":0,"is_preprint":false},{"pmid":"3270545","id":"PMC_3270545","title":"The effect of rifampicin on the development of the Streptomyces bacteriophage phi C31.","date":"1988","source":"Microbiologia (Madrid, Spain)","url":"https://pubmed.ncbi.nlm.nih.gov/3270545","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.07.08.602524","title":"Plasmid2MC: Efficient cell-free recombination of plasmids into high-purity minicircle DNA for use in genome editing applications","date":"2024-07-08","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.08.602524","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":34238,"output_tokens":3132,"usd":0.074847,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10585,"output_tokens":3487,"usd":0.07005,"stage2_stop_reason":"end_turn"},"total_usd":0.144897,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"The C31 subunit of yeast RNA polymerase III is part of a three-subunit complex (C31, C34, C82) specific to Pol III. A conditional truncation of the acidic C-terminus of C31 impairs transcription initiation of tRNA genes in the presence of general initiation factors (TFIIIB), but not non-specific transcription or termination/recycling. Overexpression of the largest Pol III subunit C160 suppresses the C31 C-terminal deletion, suggesting a functional interaction between C160 and C31.\",\n      \"method\": \"Genetic truncation/deletion mutagenesis in S. cerevisiae, in vivo tRNA transcription assay, in vitro transcription assay with/without initiation factors, suppressor overexpression screen\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with defined factors, genetic epistasis by suppressor overexpression, multiple orthogonal methods in one study\",\n      \"pmids\": [\"7835345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"POLR3G and POLR3GL arose from a DNA-based gene duplication in a common ancestor of vertebrates. Both POLR3G- and POLR3GL-containing Pol III complexes occupy the same target genes genome-wide in constant proportions within a cell line. POLR3G-containing Pol III is relatively more abundant in dividing cells. The POLR3G promoter (but not POLR3GL) binds the transcription factor MYC, indicating neo-functionalization at the level of transcriptional regulation rather than target-gene specificity.\",\n      \"method\": \"Genome-wide ChIP-seq for both Pol III isoforms, promoter binding assay for MYC, quantitative comparison in dividing vs. non-dividing cells\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq with genome-wide resolution, MYC promoter binding assay, replicated across cell lines and tissues\",\n      \"pmids\": [\"24107381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"POLR3G is required for maintenance of pluripotency in human embryonic stem cells (hESCs). Knockdown of POLR3G via inducible shRNA causes loss of pluripotency and promotes differentiation to all three germ layers without affecting apoptosis. POLR3G is a downstream transcriptional target of OCT4 and NANOG. POLR3G expression is regulated by the ERK1/2 signaling pathway.\",\n      \"method\": \"Inducible shRNA lentiviral knockdown in hESCs, differentiation assays, overexpression experiments, pharmacological inhibition of ERK1/2, reporter/ChIP analysis linking OCT4/NANOG to POLR3G promoter\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with defined cellular phenotype, pathway placement via pharmacological intervention, transcription factor regulation confirmed, multiple orthogonal methods\",\n      \"pmids\": [\"21898682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"POLR3G- and POLR3GL-containing Pol III complexes bind the same target genes and perform the same functions both in vitro and in vivo. POLR3G can functionally substitute for POLR3GL and vice versa in vivo; a differentiation defect in POLR3G-knockout ESCs is rescued by exogenous POLR3GL expression. POLR3G knockout mice die at a very early embryonic stage, while POLR3GL knockout mice survive embryogenesis but die ~3 weeks after birth with growth and potential cerebellar neuronal defects, reflecting differential expression levels across developmental stages.\",\n      \"method\": \"Conditional and complete knockout mouse models, ESC differentiation rescue assay, in vitro transcription assays, ChIP-seq for target gene occupancy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple knockout models, in vitro reconstitution, rescue experiment, genome-wide ChIP-seq, rigorous in vivo phenotyping\",\n      \"pmids\": [\"32576691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"POLR3G regulates a specific subset of the hPSC transcriptome, including protein-coding genes, lincRNAs, microRNAs, and snoRNAs, and affects RNA splicing. The primary function of POLR3G is in maintenance rather than repression of transcription. Among direct POLR3G targets, POLG (mitochondrial DNA polymerase gamma) is identified as potentially important for sustaining stem cell status.\",\n      \"method\": \"Deep-sequencing of polyA+ and smallRNA transcriptomes in POLR3G-knockdown hPSCs, bioinformatic analysis of splicing changes and promoter binding by pluripotency factors\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — deep sequencing with knockdown, single lab, transcriptomic but with defined target gene identification\",\n      \"pmids\": [\"28494942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"During skeletal muscle differentiation in Xenopus, the Polr3g isoform is expressed early in the myogenic lineage and its forced expression partially reverses myogenic differentiation. Pol III-dependent transcripts (including specific tRNA isoacceptors) are dramatically downregulated during skeletal muscle differentiation, with differential activity of Polr3g vs. Polr3gL isoforms on specific tRNA isoacceptors demonstrated by custom tRNA microarray.\",\n      \"method\": \"Custom tRNA microarray in Xenopus embryos and muscle differentiation models, forced Polr3g overexpression with myogenic differentiation readout, developmental expression profiling\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with defined phenotype, tRNA microarray, single lab with multiple methods\",\n      \"pmids\": [\"31173763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POLR3G knockout in the MDA-MB231 triple-negative breast cancer (TNBC) cell line dramatically reduces anchorage-independent growth and invasive capabilities in vitro and impairs tumor growth and metastasis formation in orthotopic xenografts in mice. POLR3G KO induces expression of the pioneer transcription factor FOXA1 and androgen receptor in TNBC but does not alter EMT marker gene expression or proliferation.\",\n      \"method\": \"CRISPR/POLR3G KO in TNBC cell line, in vitro invasion/anchorage-independent growth assays, orthotopic xenograft mouse model, gene expression analysis\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined in vitro and in vivo phenotypes, multiple readouts, single lab\",\n      \"pmids\": [\"36497214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"POLR3G promotes epithelial-mesenchymal transition (EMT) and invasiveness of bladder cancer cells via activation of the PI3K/AKT signaling pathway. POLR3G knockdown reduces migration and invasion and downregulates mesenchymal markers; these effects are rescued by PI3K/AKT pathway activator 740Y-P, and POLR3G overexpression-enhanced invasion is blocked by PI3K inhibitor LY294002.\",\n      \"method\": \"POLR3G knockdown and overexpression in bladder cancer cell lines, in vitro migration/invasion assays, in vivo xenograft, PI3K inhibitor/activator pharmacological rescue experiments, Western blot of EMT markers\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD/OE with pharmacological pathway rescue, multiple in vitro and in vivo readouts, single lab\",\n      \"pmids\": [\"37933949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"POLR3G expression in cancer is positively regulated by a gene-internal super-enhancer bound by multiple transcription factors including ZNF131, ZNF207, and MYC, and negatively regulated by gene-internal DNA methylation, retinoic-acid-induced differentiation, and MXD4. MXD4 likely disrupts MYC-driven POLR3G expression. Histone demethylase KDM5B is identified as a likely additional influencer of POLR3G gene activity.\",\n      \"method\": \"Genomic survey of mRNA and chromatin signatures; functional TF overexpression/knockdown experiments validating ZNF131, ZNF207, and MXD4 effects on POLR3G expression; chromatin architecture analysis\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional TF validation experiments, multiple genomic methods, single lab\",\n      \"pmids\": [\"37894362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-26a-5p directly targets and downregulates POLR3G mRNA in lung cancer cells, suppressing cancer stemness (colony and sphere formation) and increasing chemosensitivity to paclitaxel.\",\n      \"method\": \"miR-26a-5p overexpression in lung cancer cell lines, colony and sphere formation assays, co-treatment with paclitaxel, luciferase or direct binding assay for miR-26a-5p targeting POLR3G\",\n      \"journal\": \"Non-coding RNA research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, functional assay with miRNA overexpression but limited mechanistic depth on POLR3G itself\",\n      \"pmids\": [\"36949748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"POLR3G knockdown in bladder cancer cells inhibits the Wnt signaling pathway, as evidenced by downregulation of Wnt5a/b, DVL2, LRP-6, and phosphorylated LRP-6, suggesting POLR3G influences bladder cancer cell behavior through Wnt signaling.\",\n      \"method\": \"POLR3G knockdown in bladder cancer cell lines, RNA sequencing with enrichment analysis, Western blotting for Wnt pathway components\",\n      \"journal\": \"European journal of medical research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, KD with pathway protein measurement but no direct mechanistic link established\",\n      \"pmids\": [\"39039528\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"POLR3G (RPC7α/C31/RPC32) encodes a subunit unique to one of two isoforms of RNA polymerase III; it forms part of the Pol III-specific C31/C34/C82 subcomplex that is required for transcription initiation on tRNA genes via interaction with TFIIIB, with both POLR3G-containing Pol III and the POLR3GL-containing form occupying identical genomic target genes but being differentially regulated—POLR3G expression is driven by MYC and a super-enhancer, is enriched in embryonic stem cells and cancer cells, is required for pluripotency maintenance downstream of OCT4/NANOG, and promotes EMT and invasiveness in cancer through PI3K/AKT and Wnt signaling pathways.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"POLR3G encodes a subunit of one of two alternative isoforms of RNA polymerase III, functioning within the Pol III-specific three-subunit module (C31/C34/C82) required for transcription initiation on tRNA genes through interaction with the general initiation machinery; in yeast the orthologous C31 subunit is essential for initiation but not for non-specific transcription or termination/recycling, and it functionally interacts with the largest Pol III subunit C160 [#0]. POLR3G arose by gene duplication from POLR3GL in a vertebrate ancestor, and the two paralog-containing Pol III complexes occupy identical target genes genome-wide and are mutually substitutable, with their divergence resting at the level of transcriptional regulation rather than target-gene specificity—POLR3G expression is MYC-driven and enriched in dividing cells [#1, #3]. POLR3G maintains pluripotency in human embryonic stem cells as a downstream target of OCT4 and NANOG, where its loss drives differentiation to all three germ layers, and it sustains a defined subset of the stem-cell transcriptome including protein-coding genes, lincRNAs, microRNAs, and snoRNAs [#2, #4]. POLR3G is essential in development: its knockout causes very early embryonic lethality in mice, whereas the differentiation defect of POLR3G-null ESCs is rescued by exogenous POLR3GL [#3]. In cancer, POLR3G expression is driven by an internal super-enhancer bound by MYC, ZNF131, and ZNF207 and restrained by DNA methylation and MXD4, and it promotes invasiveness and metastasis in triple-negative breast and bladder cancer models via PI3K/AKT signaling [#6, #7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that the C31 subunit (POLR3G ortholog) is a dedicated component of a Pol III-specific subcomplex required for the initiation step of tRNA gene transcription, distinguishing its role from general transcription and recycling.\",\n      \"evidence\": \"Genetic truncation mutagenesis and in vitro/in vivo transcription assays with defined initiation factors in S. cerevisiae, plus a suppressor overexpression screen\",\n      \"pmids\": [\"7835345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the C31-C160 interaction not resolved\", \"Does not address the vertebrate-specific POLR3G/POLR3GL paralog divergence\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed POLR3G is a transcriptional target of the core pluripotency factors OCT4/NANOG and is required to maintain the undifferentiated state, placing a Pol III subunit within the pluripotency regulatory network.\",\n      \"evidence\": \"Inducible shRNA knockdown in hESCs with differentiation assays, ERK1/2 pharmacological inhibition, and promoter regulation analysis\",\n      \"pmids\": [\"21898682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking a general Pol III subunit to a specific pluripotency program not defined\", \"Whether the effect operates through Pol III catalytic output or a moonlighting role unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved why two Pol III isoforms exist by showing POLR3G and POLR3GL complexes occupy the same genes in fixed proportions, locating their functional divergence in differential transcriptional regulation (MYC binds the POLR3G promoter) rather than target specificity.\",\n      \"evidence\": \"Genome-wide ChIP-seq for both isoforms and MYC promoter binding assays across cell lines\",\n      \"pmids\": [\"24107381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of isoform swap on individual genes not yet tested\", \"Why dividing cells preferentially use POLR3G unexplained\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the breadth of the POLR3G-dependent transcriptome in pluripotent cells, showing it maintains expression of a specific gene subset across multiple RNA classes and identifying candidate effectors such as POLG.\",\n      \"evidence\": \"Deep sequencing of polyA+ and small RNA transcriptomes in POLR3G-knockdown hPSCs with splicing and promoter binding analysis\",\n      \"pmids\": [\"28494942\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect targets not fully separated\", \"Single-lab transcriptomic study without orthogonal validation of effector genes\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated isoform-specific Pol III activity on distinct tRNA isoacceptors and a role for Polr3g in opposing terminal differentiation in a developmental (myogenic) context.\",\n      \"evidence\": \"Custom tRNA microarray and forced Polr3g overexpression with myogenic readouts in Xenopus\",\n      \"pmids\": [\"31173763\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of isoacceptor selectivity unknown\", \"Relevance to mammalian muscle not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established functional redundancy between the paralogs at the protein level while revealing distinct organismal requirements driven by differential developmental expression: POLR3G loss is embryonic lethal and POLR3GL can rescue the POLR3G-null ESC defect.\",\n      \"evidence\": \"Knockout mouse models, ESC differentiation rescue assays, in vitro transcription, and ChIP-seq\",\n      \"pmids\": [\"32576691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of the early-embryonic essentiality not mechanistically dissected\", \"What sets the stage-specific expression ratio remains unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided in vivo evidence that POLR3G drives the malignant phenotype, with knockout suppressing invasion and metastasis in a triple-negative breast cancer model and derepressing FOXA1 and androgen receptor.\",\n      \"evidence\": \"CRISPR knockout in TNBC cells with in vitro invasion assays and orthotopic xenografts\",\n      \"pmids\": [\"36497214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a Pol III subunit controls FOXA1/AR expression not explained\", \"EMT markers and proliferation were unchanged, leaving the invasion mechanism open\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified the cis- and trans-regulatory architecture controlling oncogenic POLR3G expression and connected POLR3G to a defined pro-invasive signaling axis.\",\n      \"evidence\": \"Genomic chromatin survey with TF over/knockdown validation (ZNF131, ZNF207, MXD4); separate KD/OE bladder cancer study with PI3K/AKT pharmacological rescue (740Y-P, LY294002)\",\n      \"pmids\": [\"37894362\", \"37933949\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct link from Pol III transcriptional output to PI3K/AKT activation not established\", \"Whether super-enhancer regulation operates in normal stem cells unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked POLR3G to cancer stemness and chemoresistance through a miRNA regulatory input.\",\n      \"evidence\": \"miR-26a-5p overexpression with colony/sphere formation, paclitaxel co-treatment, and direct binding assay in lung cancer cells\",\n      \"pmids\": [\"36949748\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Limited mechanistic depth on POLR3G itself beyond being a miRNA target\", \"Single-lab functional study without independent confirmation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Associated POLR3G with Wnt pathway activity in bladder cancer based on co-regulation of pathway components.\",\n      \"evidence\": \"POLR3G knockdown with RNA-seq enrichment and Western blot of Wnt5a/b, DVL2, LRP-6\",\n      \"pmids\": [\"39039528\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct mechanistic link between POLR3G and Wnt components established\", \"Correlative protein measurements only\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how a shared, redundant Pol III catalytic subunit produces isoform-specific outputs that determine pluripotency, developmental essentiality, and cancer invasiveness.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism connecting Pol III transcriptional output to PI3K/AKT, Wnt, or FOXA1/AR regulation\", \"Structural basis for POLR3G vs POLR3GL functional equivalence within Pol III not resolved\", \"Determinants of the stage- and tissue-specific POLR3G/POLR3GL expression ratio unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 3, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"complexes\": [\"RNA polymerase III\"],\n    \"partners\": [\"POLR3GL\", \"MYC\", \"ZNF131\", \"ZNF207\", \"MXD4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}