{"gene":"NUDT19","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":1986,"finding":"The mouse kidney androgen-inducible RP2 protein (later identified as the Nudt19 ortholog) was characterized as a 357-amino-acid, ~40 kDa proline-rich protein encoded by a single-copy gene with three mRNA forms arising from alternative polyadenylation; mRNA was detected in all tissues examined, suggesting a housekeeping function.","method":"cDNA cloning, Northern blot analysis, genomic cloning","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — direct molecular characterization of gene/protein; single lab but multiple methods (sequencing, Northern blot); identity as NUDT19 ortholog confirmed by later proteomic work","pmids":["3755524"],"is_preprint":false},{"year":1987,"finding":"Androgen (testosterone) inducibility of the mouse kidney RP2 (Nudt19 ortholog) mRNA varies markedly across Mus species (10–20-fold in M. domesticus, absent in some species), and this variability is inherited as a single Mendelian locus tightly linked to the RP2 gene itself, indicating that cis-acting regulatory elements drive interspecies differences in transcriptional induction.","method":"Interspecies comparative Northern blot, genetic backcross analysis, transcriptional induction assays","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis/mapping plus molecular characterization; single lab but multiple complementary approaches","pmids":["3623081"],"is_preprint":false},{"year":1989,"finding":"Androgens induce transcription of the mouse kidney RP2 gene (Nudt19 ortholog) through a promoter that is specifically testosterone-sensitive; the gene contains at least two promoters, only one of which is highly androgen-responsive. Reduced inducibility in M. hortulanus maps as a cis-acting element tightly linked (0/47 recombinants) to the RP2 locus.","method":"Nuclear run-on transcription assay, interspecies backcross mapping, primer extension, promoter analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct transcription assay plus genetic mapping; single lab with orthogonal methods","pmids":["2710112"],"is_preprint":false},{"year":1991,"finding":"Cis/trans analyses in interspecific mouse hybrids revealed that androgen resistance of the kidney RP2 gene (Nudt19 ortholog) in M. hortulanus is due to a cis-acting element, while that in M. caroli is due to a trans-acting element, demonstrating that distinct genetic mechanisms underlie the convergent androgen-resistant phenotypes in different species.","method":"Allele-specific primer extension assay in interspecific heterozygotes, cis/trans genetic analysis","journal":"Molecular biology and evolution","confidence":"Medium","confidence_rationale":"Tier 2 — allele-specific molecular assay coupled with genetic dissection; single lab","pmids":["1766361"],"is_preprint":false},{"year":2006,"finding":"Proteomic analysis of mouse kidney peroxisomes identified RP2p (encoded by D7RP2e, the mouse Nudt19 gene) as a peroxisomal Nudix hydrolase containing a Nudix hydrolase domain, a CoA-binding domain, and a C-terminal PTS1 (Ala-His-Leu) peroxisomal targeting signal. In vitro enzyme assays showed it is a CoA diphosphatase active on free CoA, oxidized CoA, and a wide range of acyl-CoA esters (including choloyl-CoA and branched-chain fatty-acyl-CoAs), with optimal activity at pH ≥9 requiring Mg²⁺ or Mn²⁺. Subcellular fractionation demonstrated that all CoA diphosphatase activity in mouse kidney is restricted to peroxisomes.","method":"Peroxisome proteomics, in vitro enzyme activity assay, subcellular fractionation, C-terminal PTS1 identification","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of enzymatic activity with substrate profiling, orthogonal localization by fractionation; single lab but multiple rigorous methods","pmids":["16185196"],"is_preprint":false},{"year":2018,"finding":"Nudt19 is a peroxisomal CoA diphosphohydrolase highly expressed in mouse kidney. It specifically hydrolyzes the diphosphate bond of free CoA and acyl-CoAs, producing 3',5'-ADP and 4'-(acyl)phosphopantetheine. Deletion of Nudt19 in mice elevates kidney CoA levels under ad libitum feeding, demonstrating its role in in vivo CoA regulation in the kidney. Unlike the liver isoform Nudt7, Nudt19 protein and transcript levels are not regulated by fed/fasted state. Chenodeoxycholic acid was identified as a specific Nudt19 inhibitor competing with CoA for binding (does not inhibit Nudt7). Exchange of Nudix and CoA signature motifs between Nudt19 and Nudt7 dramatically decreased kcat, and mutagenesis of conserved residues within these motifs identified amino acids with distinct roles in CoA binding versus hydrolysis in each isoform.","method":"Nudt19 knockout mouse analysis, in vitro enzyme assays, inhibitor binding/competition assays, domain-swap and site-directed mutagenesis, CoA level measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vivo knockout phenotype combined with in vitro reconstitution, mutagenesis, and inhibitor characterization; multiple orthogonal methods in single study","pmids":["29378847"],"is_preprint":false},{"year":2022,"finding":"Knockdown of Nudt19 in murine Hepa 1-6 hepatocytes increased mitochondrial ATP production by 41% and glycolytic ATP production by 10%. Nudt19 KD cells showed enhanced fatty acid oxidation in response to palmitate or oleate (increased mitochondrial ATP production by 31% and 20%, respectively, and uncoupled respiration by 23% and 30%), accompanied by a 1.3-fold increased abundance of Pdk4, a regulator of pyruvate dehydrogenase. These data identify Nudt19 as a regulator of hepatic lipid metabolism and mitochondrial function.","method":"siRNA knockdown, Seahorse metabolic flux analysis (mitochondrial and glycolytic ATP production rates), fatty acid substrate challenge, qPCR/Western blot for Pdk4","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 — direct loss-of-function with defined metabolic phenotype readouts; single lab, single cell model","pmids":["35367353"],"is_preprint":false}],"current_model":"NUDT19 (mouse ortholog: RP2p/D7RP2e) is a peroxisomal Nudix hydrolase that degrades free CoA and acyl-CoAs by hydrolyzing the diphosphate bond to yield 3',5'-ADP and 4'-(acyl)phosphopantetheine; it requires Mg²⁺/Mn²⁺ and is specifically inhibited by chenodeoxycholic acid, and its in vivo deletion elevates kidney CoA levels, while its knockdown in hepatocytes increases mitochondrial and fatty acid oxidation-driven ATP production, establishing NUDT19 as a tissue-specific regulator of CoA homeostasis and lipid metabolism whose expression in the kidney (but not liver) is insensitive to nutritional state."},"narrative":{"teleology":[{"year":1986,"claim":"Initial molecular cloning of the mouse kidney androgen-inducible RP2 gene (later recognized as the Nudt19 ortholog) established that it encodes a broadly expressed ~40 kDa protein, providing the first sequence-level entry point for functional characterization.","evidence":"cDNA and genomic cloning with Northern blot analysis in mouse tissues","pmids":["3755524"],"confidence":"Medium","gaps":["Biochemical function of the encoded protein was unknown","Subcellular localization was not determined","Identity as a Nudix hydrolase had not yet been recognized"]},{"year":1989,"claim":"Genetic and transcriptional analyses across Mus species resolved that androgen inducibility of RP2/Nudt19 in the kidney is controlled by cis-acting regulatory elements linked to the gene, with trans-acting modifiers contributing in certain species, clarifying that transcriptional regulation of this gene varies through distinct evolutionary mechanisms.","evidence":"Nuclear run-on assays, interspecies backcross mapping, and allele-specific primer extension in hybrid mice","pmids":["2710112","3623081","1766361"],"confidence":"Medium","gaps":["Relevance of androgen regulation to CoA metabolism was not explored","Whether androgen regulation occurs in human NUDT19 is unknown","Cis-regulatory elements were not mapped at nucleotide resolution"]},{"year":2006,"claim":"Peroxisome proteomics and in vitro reconstitution identified RP2p/NUDT19 as a Mg²⁺/Mn²⁺-dependent CoA diphosphatase that accepts free CoA, oxidized CoA, and diverse acyl-CoA esters, and that all kidney CoA diphosphatase activity resides in peroxisomes, answering the long-standing question of what biochemical reaction this protein catalyzes.","evidence":"Mouse kidney peroxisome proteomics, in vitro activity assays with multiple substrates, subcellular fractionation, PTS1 signal identification","pmids":["16185196"],"confidence":"High","gaps":["In vivo relevance of the enzymatic activity had not been tested","Relationship to other CoA-degrading Nudix hydrolases (e.g., Nudt7) was uncharacterized","No structural model was available"]},{"year":2018,"claim":"Knockout of Nudt19 in mice elevated kidney CoA levels under ad libitum feeding, establishing its non-redundant in vivo role in CoA homeostasis; identification of chenodeoxycholic acid as a specific competitive inhibitor and domain-swap mutagenesis delineated catalytic determinants distinguishing NUDT19 from the paralog NUDT7.","evidence":"Nudt19 knockout mouse with CoA measurements, in vitro inhibitor competition assays, domain-swap and site-directed mutagenesis of Nudix and CoA signature motifs","pmids":["29378847"],"confidence":"High","gaps":["No crystal structure to explain isoform-specific inhibitor selectivity","Physiological consequences of elevated kidney CoA beyond steady-state levels were not characterized","Whether NUDT19 loss alters peroxisomal lipid metabolism in vivo was not tested"]},{"year":2022,"claim":"Knockdown of Nudt19 in hepatocytes increased mitochondrial ATP production and enhanced fatty acid oxidation, extending the enzyme's functional impact beyond peroxisomal CoA degradation to broader mitochondrial energy metabolism and lipid utilization.","evidence":"siRNA knockdown in murine Hepa 1-6 cells with Seahorse metabolic flux analysis and palmitate/oleate challenge","pmids":["35367353"],"confidence":"Medium","gaps":["Results are from a single hepatocyte cell line and have not been confirmed in vivo or in primary cells","Mechanism linking peroxisomal CoA pool changes to mitochondrial ATP production is undefined","Pdk4 upregulation was correlative; causal role not tested"]},{"year":null,"claim":"No crystal structure of NUDT19 exists to explain substrate promiscuity, isoform-specific inhibitor selectivity, or the catalytic consequences of the Nudix/CoA motif divergence from NUDT7; the physiological significance of peroxisomal CoA degradation in tissues beyond kidney and in human disease contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural data available for NUDT19","Human tissue-specific expression and regulation largely uncharacterized","Potential role in peroxisomal lipid disorders has not been investigated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[4,5]}],"localization":[{"term_id":"GO:0005777","term_label":"peroxisome","supporting_discovery_ids":[4,5]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4,5,6]}],"complexes":[],"partners":[],"other_free_text":[]},"mechanistic_narrative":"NUDT19 is a peroxisomal Nudix hydrolase that degrades free CoA and acyl-CoA esters by cleaving their diphosphate bond to yield 3',5'-ADP and 4'-(acyl)phosphopantetheine, thereby functioning as a tissue-specific regulator of coenzyme A homeostasis [PMID:16185196, PMID:29378847]. The enzyme requires Mg²⁺ or Mn²⁺ for catalysis, operates optimally at alkaline pH, and accepts a broad range of acyl-CoA substrates including choloyl-CoA and branched-chain fatty acyl-CoAs; it is specifically inhibited by chenodeoxycholic acid, which competes with CoA for binding [PMID:16185196, PMID:29378847]. Deletion of Nudt19 in mice elevates kidney CoA levels without regulation by nutritional state, distinguishing it from the liver paralog Nudt7, while knockdown in hepatocytes increases mitochondrial ATP production and fatty acid oxidation, linking NUDT19 activity to lipid metabolic flux [PMID:29378847, PMID:35367353]."},"prefetch_data":{"uniprot":{"accession":"A8MXV4","full_name":"Acyl-coenzyme A diphosphatase NUDT19","aliases":["Nucleoside diphosphate-linked moiety X motif 19","Nudix motif 19"],"length_aa":375,"mass_kda":42.2,"function":"Fatty acyl-coenzyme A (CoA) diphosphatase that hydrolyzes fatty acyl-CoA to yield acyl-4'-phosphopantetheine and adenosine 3',5'-bisphosphate (By similarity). Mediates the hydrolysis of a wide range of CoA esters, including choloyl-CoA and branched-chain fatty-acyl-CoA esters and at low substrate concentrations medium and long-chain fatty-acyl-CoA esters are the primary substrates (By similarity). Highest activity seen with medium-chain acyl-CoA esters and higher rates of activity seen with the unsaturated acyl-CoA esters compared with the saturated esters (By similarity). Exhibits decapping activity towards dpCoA-capped RNAs in vitro (By similarity)","subcellular_location":"Peroxisome","url":"https://www.uniprot.org/uniprotkb/A8MXV4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NUDT19","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NUDT19","total_profiled":1310},"omim":[{"mim_id":"621403","title":"NUDIX HYDROLASE 19; NUDT19","url":"https://www.omim.org/entry/621403"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NUDT19"},"hgnc":{"alias_symbol":["RP2"],"prev_symbol":[]},"alphafold":{"accession":"A8MXV4","domains":[{"cath_id":"3.90.79.10","chopping":"14-26_38-291","consensus_level":"high","plddt":90.3747,"start":14,"end":291},{"cath_id":"-","chopping":"294-355","consensus_level":"high","plddt":94.7431,"start":294,"end":355}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A8MXV4","model_url":"https://alphafold.ebi.ac.uk/files/AF-A8MXV4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A8MXV4-F1-predicted_aligned_error_v6.png","plddt_mean":87.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NUDT19","jax_strain_url":"https://www.jax.org/strain/search?query=NUDT19"},"sequence":{"accession":"A8MXV4","fasta_url":"https://rest.uniprot.org/uniprotkb/A8MXV4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A8MXV4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A8MXV4"}},"corpus_meta":[{"pmid":"11992260","id":"PMC_11992260","title":"A 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B","url":"https://pubmed.ncbi.nlm.nih.gov/35256949","citation_count":66,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35831314","id":"PMC_35831314","title":"Scalable multiplex co-fractionation/mass spectrometry platform for accelerated protein interactome discovery.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35831314","citation_count":65,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33957083","id":"PMC_33957083","title":"Comprehensive interactome profiling of the human Hsp70 network highlights functional differentiation of J domains.","date":"2021","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/33957083","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16185196","id":"PMC_16185196","title":"Proteomic analysis of mouse kidney peroxisomes: identification of RP2p as a peroxisomal nudix hydrolase with acyl-CoA diphosphatase activity.","date":"2006","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/16185196","citation_count":62,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35384245","id":"PMC_35384245","title":"Physical and functional interactome atlas of human receptor tyrosine kinases.","date":"2022","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/35384245","citation_count":50,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31536960","id":"PMC_31536960","title":"Rewiring of the Human Mitochondrial Interactome during Neuronal Reprogramming Reveals Regulators of the Respirasome and Neurogenesis.","date":"2019","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/31536960","citation_count":45,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20178365","id":"PMC_20178365","title":"A proteome-wide perspective on peroxisome targeting signal 1(PTS1)-Pex5p affinities.","date":"2010","source":"Journal of the American Chemical Society","url":"https://pubmed.ncbi.nlm.nih.gov/20178365","citation_count":42,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20877624","id":"PMC_20877624","title":"Genetic variants in nuclear-encoded mitochondrial genes influence AIDS progression.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20877624","citation_count":37,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35509820","id":"PMC_35509820","title":"The involvement of Parkin-dependent mitophagy in the anti-cancer activity of Ginsenoside.","date":"2021","source":"Journal of ginseng research","url":"https://pubmed.ncbi.nlm.nih.gov/35509820","citation_count":31,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"36215168","id":"PMC_36215168","title":"TRIM67 drives tumorigenesis in oligodendrogliomas through Rho GTPase-dependent membrane blebbing.","date":"2023","source":"Neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/36215168","citation_count":25,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31617661","id":"PMC_31617661","title":"Global Interactome Mapping of Mitochondrial Intermembrane Space Proteases Identifies a Novel Function for HTRA2.","date":"2019","source":"Proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/31617661","citation_count":24,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29778605","id":"PMC_29778605","title":"Proteomic and Biochemical Comparison of the Cellular Interaction Partners of Human VPS33A and VPS33B.","date":"2018","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/29778605","citation_count":23,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49414,"output_tokens":1107,"usd":0.082423},"stage2":{"model":"claude-opus-4-6","input_tokens":4041,"output_tokens":1043,"usd":0.06942},"total_usd":0.374303,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":62237,"output_tokens":2748,"usd":0.113965},"round2_rules_fired":"R2,R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5676,"output_tokens":1758,"usd":0.108495}},"stage1_raw":"Looking at the corpus, I need to identify papers about the human gene **NUDT19** (a Nudix hydrolase). The vast majority of papers in this corpus are about **RP2** (retinitis pigmentosa 2), which is a completely different gene. I need to filter carefully.\n\nPapers relevant to NUDT19:\n- PMID 29378847: \"Nudt19 is a renal CoA diphosphohydrolase...\" — directly about NUDT19\n- PMID 35367353: \"Nudix hydrolase NUDT19 regulates mitochondrial function and ATP production in murine hepatocytes\" — directly about NUDT19\n\nAll other papers are about RP2 (X-linked retinitis pigmentosa gene), various collisions (Drosophila RP2 motoneuron, mouse kidney RP2, phage RP2, etc.), or unrelated genes. I will extract only NUDT19 findings.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"NUDT19 is a peroxisomal CoA diphosphohydrolase expressed predominantly in the kidney that hydrolyzes the diphosphate bond of free CoA and acyl-CoAs to generate 3',5'-ADP and 4'-(acyl)phosphopantetheine. Deletion of Nudt19 in mice elevates kidney CoA levels in ad libitum-fed animals, establishing that NUDT19 contributes to CoA regulation in vivo. Unlike the hepatic paralog Nudt7, NUDT19 protein and transcript levels in kidney do not change between fed and fasted states. Chenodeoxycholic acid was identified as a specific competitive inhibitor of NUDT19 that competes with CoA but does not bind Nudt7. Exchange of the Nudix and CoA signature motifs between NUDT19 and Nudt7 dramatically decreased their kcat values, and mutagenesis of conserved residues within these motifs identified amino acids playing distinct roles in CoA binding versus hydrolysis in the two isoforms.\",\n      \"method\": \"Knockout mouse phenotyping (CoA measurement), in vitro enzyme assays, mutagenesis of active-site residues, inhibitor competition assays, domain-swap experiments between NUDT19 and Nudt7\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution with mutagenesis, validated by in vivo knockout, multiple orthogonal methods in single study\",\n      \"pmids\": [\"29378847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Knockdown of Nudt19 in murine hepatocytes (Hepa 1-6 cells) increased mitochondrial ATP production by 41% and glycolytic ATP production by 10%. Nudt19 knockdown also prevented the reduction in uncoupled respiration normally caused by switching to glutamine or fatty acid substrates, and enhanced fatty acid oxidation (increased by ~20-31% with palmitate or oleate), accompanied by elevated Pdk4 abundance. These findings identify NUDT19 as a regulator of hepatic lipid metabolism and mitochondrial function.\",\n      \"method\": \"siRNA knockdown in Hepa 1-6 hepatocyte cells, Seahorse metabolic flux assays (mitochondrial and glycolytic ATP production rates, uncoupled respiration), Western blotting for Pdk4\",\n      \"journal\": \"Biochimica et Biophysica Acta. Molecular and Cell Biology of Lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — clean KD with defined metabolic phenotype, single lab, single cell-line model\",\n      \"pmids\": [\"35367353\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUDT19 is a peroxisomal CoA diphosphohydrolase predominantly expressed in the kidney that cleaves free CoA and acyl-CoAs at the diphosphate bond to regulate intracellular CoA levels; it is competitively inhibited by chenodeoxycholic acid, its catalytic mechanism depends on conserved Nudix and CoA signature motif residues distinct from those of the hepatic paralog Nudt7, and its loss in hepatocytes enhances mitochondrial fatty acid oxidation and ATP production, implicating it as a regulator of lipid metabolism.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to identify papers about NUDT19 (a Nudix hydrolase/CoA diphosphohydrolase) versus the many papers about RP2 (retinitis pigmentosa 2 gene), which is a completely different gene.\n\n**Classification:**\n- Papers about RP2 (X-linked retinitis pigmentosa protein): EXCLUDE (alias collision - \"RP2\" in the mouse kidney androgen-inducible gene context or the retinal disease gene are completely different from NUDT19)\n- Papers about NUDT19 specifically: KEEP\n\nFrom the main corpus:\n- Paper [37] (PMID:29378847): \"Nudt19 is a renal CoA diphosphohydrolase...\" — KEEP\n- Paper [55] (PMID:2710112): Mouse kidney \"RP2\" androgen-inducible gene — this is the mouse Nudt19 ortholog (D7RP2e gene). KEEP\n- Paper [58] (PMID:3623081): Evolution of \"RP2\" mRNA in mouse kidney — same mouse Nudt19. KEEP  \n- Paper [74] (PMID:3755524): \"testosterone-regulated mouse kidney RP2 protein\" — same mouse Nudt19. KEEP\n- Paper [73] (PMID:1766361): Evolution of mouse kidney RP2 mRNAs — same mouse Nudt19. KEEP\n\nFrom additional papers:\n- Paper [22] (PMID:16185196): \"Proteomic analysis of mouse kidney peroxisomes: identification of RP2p as a peroxisomal nudix hydrolase with acyl-CoA diphosphatase activity\" — KEEP (this is NUDT19/D7RP2e)\n- Paper [65] (PMID:35367353): \"Nudix hydrolase NUDT19 regulates mitochondrial function and ATP production in murine hepatocytes\" — KEEP\n\nAll other papers describe the retinal disease gene RP2, Drosophila RP2 motoneurons, bacteriophage RP2, CTGF/IGFBP-rP2, IL1R-rp2, Vti1-rp2 SNARE, PSA-RP2, Anopheles rp2 QTL, peptide CY12-RP2, or interactome studies without NUDT19-specific findings — EXCLUDE.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1986,\n      \"finding\": \"The mouse kidney androgen-inducible RP2 protein (later identified as the Nudt19 ortholog) was characterized as a 357-amino-acid, ~40 kDa proline-rich protein encoded by a single-copy gene with three mRNA forms arising from alternative polyadenylation; mRNA was detected in all tissues examined, suggesting a housekeeping function.\",\n      \"method\": \"cDNA cloning, Northern blot analysis, genomic cloning\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular characterization of gene/protein; single lab but multiple methods (sequencing, Northern blot); identity as NUDT19 ortholog confirmed by later proteomic work\",\n      \"pmids\": [\"3755524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"Androgen (testosterone) inducibility of the mouse kidney RP2 (Nudt19 ortholog) mRNA varies markedly across Mus species (10–20-fold in M. domesticus, absent in some species), and this variability is inherited as a single Mendelian locus tightly linked to the RP2 gene itself, indicating that cis-acting regulatory elements drive interspecies differences in transcriptional induction.\",\n      \"method\": \"Interspecies comparative Northern blot, genetic backcross analysis, transcriptional induction assays\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis/mapping plus molecular characterization; single lab but multiple complementary approaches\",\n      \"pmids\": [\"3623081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Androgens induce transcription of the mouse kidney RP2 gene (Nudt19 ortholog) through a promoter that is specifically testosterone-sensitive; the gene contains at least two promoters, only one of which is highly androgen-responsive. Reduced inducibility in M. hortulanus maps as a cis-acting element tightly linked (0/47 recombinants) to the RP2 locus.\",\n      \"method\": \"Nuclear run-on transcription assay, interspecies backcross mapping, primer extension, promoter analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct transcription assay plus genetic mapping; single lab with orthogonal methods\",\n      \"pmids\": [\"2710112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Cis/trans analyses in interspecific mouse hybrids revealed that androgen resistance of the kidney RP2 gene (Nudt19 ortholog) in M. hortulanus is due to a cis-acting element, while that in M. caroli is due to a trans-acting element, demonstrating that distinct genetic mechanisms underlie the convergent androgen-resistant phenotypes in different species.\",\n      \"method\": \"Allele-specific primer extension assay in interspecific heterozygotes, cis/trans genetic analysis\",\n      \"journal\": \"Molecular biology and evolution\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — allele-specific molecular assay coupled with genetic dissection; single lab\",\n      \"pmids\": [\"1766361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Proteomic analysis of mouse kidney peroxisomes identified RP2p (encoded by D7RP2e, the mouse Nudt19 gene) as a peroxisomal Nudix hydrolase containing a Nudix hydrolase domain, a CoA-binding domain, and a C-terminal PTS1 (Ala-His-Leu) peroxisomal targeting signal. In vitro enzyme assays showed it is a CoA diphosphatase active on free CoA, oxidized CoA, and a wide range of acyl-CoA esters (including choloyl-CoA and branched-chain fatty-acyl-CoAs), with optimal activity at pH ≥9 requiring Mg²⁺ or Mn²⁺. Subcellular fractionation demonstrated that all CoA diphosphatase activity in mouse kidney is restricted to peroxisomes.\",\n      \"method\": \"Peroxisome proteomics, in vitro enzyme activity assay, subcellular fractionation, C-terminal PTS1 identification\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of enzymatic activity with substrate profiling, orthogonal localization by fractionation; single lab but multiple rigorous methods\",\n      \"pmids\": [\"16185196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nudt19 is a peroxisomal CoA diphosphohydrolase highly expressed in mouse kidney. It specifically hydrolyzes the diphosphate bond of free CoA and acyl-CoAs, producing 3',5'-ADP and 4'-(acyl)phosphopantetheine. Deletion of Nudt19 in mice elevates kidney CoA levels under ad libitum feeding, demonstrating its role in in vivo CoA regulation in the kidney. Unlike the liver isoform Nudt7, Nudt19 protein and transcript levels are not regulated by fed/fasted state. Chenodeoxycholic acid was identified as a specific Nudt19 inhibitor competing with CoA for binding (does not inhibit Nudt7). Exchange of Nudix and CoA signature motifs between Nudt19 and Nudt7 dramatically decreased kcat, and mutagenesis of conserved residues within these motifs identified amino acids with distinct roles in CoA binding versus hydrolysis in each isoform.\",\n      \"method\": \"Nudt19 knockout mouse analysis, in vitro enzyme assays, inhibitor binding/competition assays, domain-swap and site-directed mutagenesis, CoA level measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vivo knockout phenotype combined with in vitro reconstitution, mutagenesis, and inhibitor characterization; multiple orthogonal methods in single study\",\n      \"pmids\": [\"29378847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Knockdown of Nudt19 in murine Hepa 1-6 hepatocytes increased mitochondrial ATP production by 41% and glycolytic ATP production by 10%. Nudt19 KD cells showed enhanced fatty acid oxidation in response to palmitate or oleate (increased mitochondrial ATP production by 31% and 20%, respectively, and uncoupled respiration by 23% and 30%), accompanied by a 1.3-fold increased abundance of Pdk4, a regulator of pyruvate dehydrogenase. These data identify Nudt19 as a regulator of hepatic lipid metabolism and mitochondrial function.\",\n      \"method\": \"siRNA knockdown, Seahorse metabolic flux analysis (mitochondrial and glycolytic ATP production rates), fatty acid substrate challenge, qPCR/Western blot for Pdk4\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct loss-of-function with defined metabolic phenotype readouts; single lab, single cell model\",\n      \"pmids\": [\"35367353\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUDT19 (mouse ortholog: RP2p/D7RP2e) is a peroxisomal Nudix hydrolase that degrades free CoA and acyl-CoAs by hydrolyzing the diphosphate bond to yield 3',5'-ADP and 4'-(acyl)phosphopantetheine; it requires Mg²⁺/Mn²⁺ and is specifically inhibited by chenodeoxycholic acid, and its in vivo deletion elevates kidney CoA levels, while its knockdown in hepatocytes increases mitochondrial and fatty acid oxidation-driven ATP production, establishing NUDT19 as a tissue-specific regulator of CoA homeostasis and lipid metabolism whose expression in the kidney (but not liver) is insensitive to nutritional state.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NUDT19 is a peroxisomal Nudix hydrolase that cleaves the diphosphate bond of free CoA and acyl-CoAs to generate 3',5'-ADP and 4'-(acyl)phosphopantetheine, functioning as a CoA diphosphohydrolase predominantly expressed in the kidney [PMID:29378847]. Deletion of Nudt19 in mice elevates kidney CoA levels, establishing its role as an in vivo regulator of intracellular CoA homeostasis; unlike the hepatic paralog Nudt7, NUDT19 expression does not change between fed and fasted states, and the enzyme is specifically and competitively inhibited by chenodeoxycholic acid [PMID:29378847]. Loss of NUDT19 in hepatocytes enhances mitochondrial fatty acid oxidation, uncoupled respiration, and ATP production, linking CoA metabolism to broader lipid and energy homeostasis [PMID:35367353].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Establishing that NUDT19 is an enzymatically active peroxisomal CoA diphosphohydrolase with in vivo relevance resolved the molecular identity and physiological role of a kidney-enriched Nudix family member, distinguishing it mechanistically from its hepatic paralog Nudt7.\",\n      \"evidence\": \"In vitro enzyme assays with mutagenesis, domain-swap experiments between NUDT19 and Nudt7, inhibitor competition assays with chenodeoxycholic acid, and Nudt19-knockout mouse kidney CoA measurements\",\n      \"pmids\": [\"29378847\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of substrate binding and chenodeoxycholic acid inhibition not resolved at atomic level\",\n        \"Physiological relevance of bile acid inhibition in vivo not tested\",\n        \"Whether NUDT19 regulates CoA levels in tissues beyond the kidney was not addressed\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that loss of NUDT19 in hepatocytes enhances mitochondrial fatty acid oxidation and ATP production extended the functional significance of CoA regulation by NUDT19 beyond simple metabolite turnover to broader lipid and energy metabolism.\",\n      \"evidence\": \"siRNA knockdown in murine Hepa 1-6 hepatocytes with Seahorse metabolic flux analysis and Western blotting\",\n      \"pmids\": [\"35367353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Findings derived from a single hepatocyte cell line; in vivo hepatic confirmation is lacking\",\n        \"Whether the metabolic phenotype is a direct consequence of elevated CoA or involves additional intermediary mechanisms is unresolved\",\n        \"Mechanism linking NUDT19 loss to increased Pdk4 abundance is not defined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for NUDT19's substrate selectivity and chenodeoxycholic acid inhibition, the physiological role of bile acid regulation of NUDT19 activity, and the in vivo metabolic consequences of NUDT19 loss in the liver remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of NUDT19 available\",\n        \"In vivo hepatic or systemic metabolic phenotyping of NUDT19 loss not performed\",\n        \"Endogenous regulatory mechanisms controlling NUDT19 expression or activity are unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"NUDT19 is a peroxisomal Nudix hydrolase that degrades free CoA and acyl-CoA esters by cleaving their diphosphate bond to yield 3',5'-ADP and 4'-(acyl)phosphopantetheine, thereby functioning as a tissue-specific regulator of coenzyme A homeostasis [PMID:16185196, PMID:29378847]. The enzyme requires Mg²⁺ or Mn²⁺ for catalysis, operates optimally at alkaline pH, and accepts a broad range of acyl-CoA substrates including choloyl-CoA and branched-chain fatty acyl-CoAs; it is specifically inhibited by chenodeoxycholic acid, which competes with CoA for binding [PMID:16185196, PMID:29378847]. Deletion of Nudt19 in mice elevates kidney CoA levels without regulation by nutritional state, distinguishing it from the liver paralog Nudt7, while knockdown in hepatocytes increases mitochondrial ATP production and fatty acid oxidation, linking NUDT19 activity to lipid metabolic flux [PMID:29378847, PMID:35367353].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Initial molecular cloning of the mouse kidney androgen-inducible RP2 gene (later recognized as the Nudt19 ortholog) established that it encodes a broadly expressed ~40 kDa protein, providing the first sequence-level entry point for functional characterization.\",\n      \"evidence\": \"cDNA and genomic cloning with Northern blot analysis in mouse tissues\",\n      \"pmids\": [\"3755524\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Biochemical function of the encoded protein was unknown\",\n        \"Subcellular localization was not determined\",\n        \"Identity as a Nudix hydrolase had not yet been recognized\"\n      ]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Genetic and transcriptional analyses across Mus species resolved that androgen inducibility of RP2/Nudt19 in the kidney is controlled by cis-acting regulatory elements linked to the gene, with trans-acting modifiers contributing in certain species, clarifying that transcriptional regulation of this gene varies through distinct evolutionary mechanisms.\",\n      \"evidence\": \"Nuclear run-on assays, interspecies backcross mapping, and allele-specific primer extension in hybrid mice\",\n      \"pmids\": [\"2710112\", \"3623081\", \"1766361\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Relevance of androgen regulation to CoA metabolism was not explored\",\n        \"Whether androgen regulation occurs in human NUDT19 is unknown\",\n        \"Cis-regulatory elements were not mapped at nucleotide resolution\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Peroxisome proteomics and in vitro reconstitution identified RP2p/NUDT19 as a Mg²⁺/Mn²⁺-dependent CoA diphosphatase that accepts free CoA, oxidized CoA, and diverse acyl-CoA esters, and that all kidney CoA diphosphatase activity resides in peroxisomes, answering the long-standing question of what biochemical reaction this protein catalyzes.\",\n      \"evidence\": \"Mouse kidney peroxisome proteomics, in vitro activity assays with multiple substrates, subcellular fractionation, PTS1 signal identification\",\n      \"pmids\": [\"16185196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"In vivo relevance of the enzymatic activity had not been tested\",\n        \"Relationship to other CoA-degrading Nudix hydrolases (e.g., Nudt7) was uncharacterized\",\n        \"No structural model was available\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Knockout of Nudt19 in mice elevated kidney CoA levels under ad libitum feeding, establishing its non-redundant in vivo role in CoA homeostasis; identification of chenodeoxycholic acid as a specific competitive inhibitor and domain-swap mutagenesis delineated catalytic determinants distinguishing NUDT19 from the paralog NUDT7.\",\n      \"evidence\": \"Nudt19 knockout mouse with CoA measurements, in vitro inhibitor competition assays, domain-swap and site-directed mutagenesis of Nudix and CoA signature motifs\",\n      \"pmids\": [\"29378847\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal structure to explain isoform-specific inhibitor selectivity\",\n        \"Physiological consequences of elevated kidney CoA beyond steady-state levels were not characterized\",\n        \"Whether NUDT19 loss alters peroxisomal lipid metabolism in vivo was not tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Knockdown of Nudt19 in hepatocytes increased mitochondrial ATP production and enhanced fatty acid oxidation, extending the enzyme's functional impact beyond peroxisomal CoA degradation to broader mitochondrial energy metabolism and lipid utilization.\",\n      \"evidence\": \"siRNA knockdown in murine Hepa 1-6 cells with Seahorse metabolic flux analysis and palmitate/oleate challenge\",\n      \"pmids\": [\"35367353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Results are from a single hepatocyte cell line and have not been confirmed in vivo or in primary cells\",\n        \"Mechanism linking peroxisomal CoA pool changes to mitochondrial ATP production is undefined\",\n        \"Pdk4 upregulation was correlative; causal role not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"No crystal structure of NUDT19 exists to explain substrate promiscuity, isoform-specific inhibitor selectivity, or the catalytic consequences of the Nudix/CoA motif divergence from NUDT7; the physiological significance of peroxisomal CoA degradation in tissues beyond kidney and in human disease contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural data available for NUDT19\",\n        \"Human tissue-specific expression and regulation largely uncharacterized\",\n        \"Potential role in peroxisomal lipid disorders has not been investigated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 5, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```"}