{"gene":"MRPL23","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":1995,"finding":"MRPL23 (originally named L23MRP) was identified as a novel gene located ~40 kb downstream of the imprinted H19 gene on chromosome 11p15.5, encoding a mitochondrial ribosomal large subunit protein. It is biallelically expressed in mid-fetal and adult human tissues, indicating it is functionally insulated from the IGF2/H19 imprinted domain.","method":"cDNA cloning, Northern blot, allele-specific expression analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — original cloning with allelic expression analysis, single lab","pmids":["8541832"],"is_preprint":false},{"year":1997,"finding":"The mouse ortholog L23mrp maps to the conserved syntenic region on distal chromosome 7. Its promoter is a CpG island driving ubiquitous transcription. Both parental alleles are equally active (biallelic expression). Targeted deletion of enhancers shared by Ins-2/Igf-2/H19 does not affect L23mrp expression, demonstrating that L23mrp is functionally insulated from the upstream imprinted domain in terms of both imprinting and enhancer action.","method":"Mouse gene cloning, allele-specific expression analysis, targeted enhancer deletion mouse model","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis via targeted deletion in vivo, clear phenotypic readout, single lab with multiple orthogonal methods","pmids":["9344651"],"is_preprint":false},{"year":1998,"finding":"The murine imprinting cluster on distal chromosome 7 (~1 Mb) is demarcated at its 3' end by L23mrp (Rpl23l/MRPL23), which is directly flanked by and non-imprinted, establishing MRPL23 as a boundary marker of the Beckwith-Wiedemann syndrome imprinted domain.","method":"Physical contig mapping, FISH, expression analysis across tissues","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — comprehensive physical mapping with multiple clones and probes, single study","pmids":["9618174"],"is_preprint":false},{"year":2000,"finding":"In Kluyveromyces lactis, disruption of MRP-L23 (encoding a mitochondrial large subunit ribosomal protein with 43% identity to E. coli L13) is lethal, whereas in Saccharomyces cerevisiae it only causes respiratory deficiency. The K. lactis protein can complement the respiratory-deficient phenotype of S. cerevisiae mrp-L23 mutants, demonstrating that MRPL23 is an essential component of the mitochondrial ribosome large subunit required for mitochondrial protein synthesis.","method":"Gene disruption, complementation assay, growth on non-fermentable carbon sources","journal":"Current genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic complementation plus loss-of-function with defined viability phenotype in yeast ortholog","pmids":["10743564"],"is_preprint":false},{"year":2002,"finding":"MRPL23 and flanking genes (2G7, TNNT3) in the 100 kb immediately downstream of H19 are biallelically expressed, confirming that H19 marks one border of the imprinted domain and that MRPL23 resides outside the imprinted region.","method":"Allele-specific expression analysis in multiple fetal and adult tissues (human and mouse)","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — multi-tissue allele-specific expression analysis, confirms prior findings","pmids":["12589428"],"is_preprint":false},{"year":2002,"finding":"A CTCF binding site in the intergenic region between H19 and L23mrp acts as an insulator element at the 3' boundary of the imprinted Igf2/H19 domain. This site is conserved between human and mouse, associated with a DNase I-hypersensitive site, bound by CTCF in vivo, and functions as an insulator in reporter assays. This element contributes to the functional insulation of MRPL23 from the upstream imprinted domain.","method":"CTCF binding site identification, DNase I hypersensitivity, chromatin immunoprecipitation (in vivo CTCF binding), transfection-based reporter insulator assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including in vivo ChIP, functional reporter assay, and conservation analysis","pmids":["12075007"],"is_preprint":false},{"year":2002,"finding":"Mammalian mitochondrial ribosomes (55S) have evolved a protein-rich composition with up to 80 MRPs (including MRPL23) that have replaced RNA structural elements found in bacterial ribosomes. MRPL23 is encoded by a nuclear gene, imported into mitochondria, and assembled with mitochondrially transcribed rRNAs to form the large subunit responsible for translating the 13 mRNAs encoding essential oxidative phosphorylation proteins.","method":"Biochemical characterization of bovine mitoribosomal proteins, amino acid sequencing, evolutionary analysis","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical characterization of the mitoribosome as a system; MRPL23 inferred as component by evolutionary and compositional analysis","pmids":["11943462"],"is_preprint":false},{"year":2014,"finding":"Cryo-EM structure of the human mitochondrial large ribosomal subunit at 3.4 Å resolution revealed 48 proteins including MRPL23 as a structural component. The structure showed adaptations of the exit tunnel for hydrophobic nascent peptides and extensive remodeling of the central protuberance, placing MRPL23 in the context of the 39S large subunit architecture.","method":"Single-particle cryo-electron microscopy at 3.4 Å resolution","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — near-atomic resolution cryo-EM structure of the intact complex","pmids":["25278503"],"is_preprint":false},{"year":2016,"finding":"MRPL23 is confirmed as a protein component of the human mitochondrial ribosome large subunit (mt-LSU) through mitochondrial protein interaction mapping using affinity enrichment mass spectrometry. Its interactions are consistent with a structural role in the large subunit.","method":"Affinity enrichment mass spectrometry (mitochondrial protein interaction mapping)","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 — systematic AP-MS interaction mapping in mitochondrial context","pmids":["27499296"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structures of two late-stage assembly intermediates of the human mitoribosomal large subunit (~3 Å resolution) revealed details of rRNA folding and protein incorporation timing during ribosomal maturation, placing MRPL23 within the assembly pathway of the mt-LSU. The structures identified assembly factors including RsfS, L0R8F8, and mt-ACP.","method":"Single-particle cryo-EM at ~3 Å resolution of native assembly intermediates","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — near-atomic cryo-EM of native assembly intermediates with functional interpretation","pmids":["28892042"],"is_preprint":false},{"year":2018,"finding":"MRPL23 is located within the IGF2 locus alongside Th and other conserved genes across vertebrates including fish, confirming that MRPL23 (Mrpl23) has been a stable component of the Igf2 chromosomal locus since early vertebrate ancestors, consistent with its conserved role as a mitochondrial ribosomal protein.","method":"Comparative genomics using genome and gene expression repositories across >20 vertebrate species","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 4 — computational/bioinformatics genomic analysis","pmids":["30154247"],"is_preprint":false},{"year":2020,"finding":"MRPL23 is identified as an essential component of the mitoribosome complex in mammals. Expression profiling across 79 Mrp genes during mouse development shows consistent expression throughout early embryogenesis with little stage or tissue specificity, and genetic evidence indicates that Mrpl23 loss results in early embryonic lethality, demonstrating no functional redundancy among MRP family members.","method":"mRNA expression profiling (in situ hybridization and RT-PCR across developmental stages), analysis of lethal knockout phenotypes","journal":"Gene expression patterns : GEP","confidence":"Medium","confidence_rationale":"Tier 2 — systematic expression profiling combined with genetic lethality evidence across multiple Mrp genes","pmids":["32987154"],"is_preprint":false},{"year":2020,"finding":"MRPL23 is identified as a component of the high-confidence human mitochondrial proteome (MitoCoP) with defined abundance and half-life dynamics, confirming its residence in the mitochondrial compartment in cellular context.","method":"Quantitative mass spectrometry of mitochondrial preparations combined with protein turnover measurements","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative proteomics with abundance and turnover measurements","pmids":["34800366"],"is_preprint":false},{"year":2020,"finding":"BioID proximity interaction mapping of mitochondrial proteins confirmed MRPL23's proximity interactions within the mitochondrial large subunit environment, consistent with its structural role in the mt-LSU.","method":"BioID proximity-dependent biotinylation with 100 mitochondrial baits, mass spectrometry","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — systematic BioID across mitochondrial compartments","pmids":["32877691"],"is_preprint":false},{"year":2024,"finding":"Single-cell transcriptome analysis combined with lentiviral barcoding (SCALeBa) in human HSPCs revealed that cells expressing high levels of MRPL23 show a differentiation bias toward the myeloid lineage in vivo, suggesting MRPL23 expression is associated with myeloid fate determination in hematopoietic progenitors.","method":"Single-cell RNA-seq with lentiviral barcoding for clonal tracking in vivo, validated in independent dataset","journal":"Clinical and translational medicine","confidence":"Low","confidence_rationale":"Tier 3 — single-cell transcriptomics with lineage tracking; correlation-based finding without direct mechanistic perturbation of MRPL23","pmids":["39538416"],"is_preprint":false},{"year":2025,"finding":"Suppression of MRPL23 in hepatocellular carcinoma cells decreases cell proliferation and promotes cellular senescence. MRPL23 regulates senescence by targeting HMGB1, as demonstrated using the HMGB1 inhibitor NecroX-7. MRPL23 deficiency also protects against HCC progression in a mouse model, identifying MRPL23 as an oncogenic factor whose loss triggers a senescence barrier to tumor growth.","method":"siRNA/shRNA knockdown, cell proliferation assay, senescence assays, mouse xenograft model, pharmacological inhibition with NecroX-7","journal":"Discover oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 — loss-of-function with defined senescence phenotype and pharmacological target validation in vitro and in vivo, single lab","pmids":["40490666"],"is_preprint":false}],"current_model":"MRPL23 encodes a structural protein of the mitochondrial ribosome large subunit (mt-LSU/39S), essential for mitochondrial protein synthesis, whose genomic locus is demarcated from the upstream IGF2/H19 imprinted domain by a CTCF-dependent insulator element; beyond its ribosomal structural role (confirmed by cryo-EM at near-atomic resolution), MRPL23 loss in hepatocellular carcinoma triggers HMGB1-dependent cellular senescence and suppresses tumor progression, while its expression in hematopoietic progenitors associates with myeloid lineage bias."},"narrative":{"teleology":[{"year":1995,"claim":"Cloning of MRPL23 established it as a nuclear-encoded mitochondrial ribosomal protein gene located immediately downstream of the H19 imprinted locus, raising the question of how it escapes imprinting control.","evidence":"cDNA cloning, Northern blot, and allele-specific expression analysis in human fetal and adult tissues","pmids":["8541832"],"confidence":"Medium","gaps":["No functional data on its ribosomal role in mammalian cells","Mechanism of insulation from imprinted domain unknown"]},{"year":1997,"claim":"Targeted enhancer deletion in mouse demonstrated that MRPL23 is functionally insulated from the upstream Igf2/H19 enhancers and imprinting machinery, ruling out shared regulatory control.","evidence":"Mouse targeted enhancer deletion, allele-specific expression, CpG island promoter characterization","pmids":["9344651"],"confidence":"High","gaps":["Molecular identity of the insulator element not yet defined","Whether insulation is chromatin-mediated or sequence-mediated was unresolved"]},{"year":2000,"claim":"Cross-species complementation showed that MRPL23 is a bona fide essential component of the mitochondrial ribosome large subunit required for mitochondrial translation, answering whether it has a direct functional role in mitoribosome activity.","evidence":"Gene disruption in K. lactis (lethal) and S. cerevisiae (respiratory deficiency), cross-species complementation","pmids":["10743564"],"confidence":"High","gaps":["No structural data on where MRPL23 resides within the mt-LSU","Mammalian loss-of-function phenotype not yet characterized"]},{"year":2002,"claim":"Identification of a conserved CTCF-binding insulator element between H19 and MRPL23 resolved the mechanism by which this locus is shielded from the adjacent imprinted domain, establishing CTCF as the boundary factor.","evidence":"CTCF ChIP, DNase I hypersensitivity mapping, transfection-based insulator reporter assay, human-mouse conservation analysis","pmids":["12075007","12589428","9618174"],"confidence":"High","gaps":["Whether deletion of this CTCF site in vivo would cause MRPL23 to become imprinted was not tested","Relationship between CTCF boundary and Beckwith-Wiedemann syndrome pathogenesis at this locus not determined"]},{"year":2014,"claim":"Near-atomic cryo-EM of the human mt-LSU resolved MRPL23 as one of 48 structural proteins and revealed the remodeled exit tunnel and central protuberance architecture, placing it in a definitive structural context.","evidence":"Single-particle cryo-EM of the human 39S subunit at 3.4 Å resolution","pmids":["25278503"],"confidence":"High","gaps":["Specific contacts of MRPL23 with rRNA and neighboring proteins not individually characterized","No structure of the complete 55S translating ribosome at this resolution"]},{"year":2017,"claim":"Cryo-EM of late assembly intermediates revealed the timing and pathway of mt-LSU maturation, establishing when MRPL23 is incorporated during subunit biogenesis.","evidence":"Cryo-EM at ~3 Å of native mt-LSU assembly intermediates","pmids":["28892042"],"confidence":"High","gaps":["Order of MRPL23 incorporation relative to other MRPs not individually resolved","Assembly chaperones specific to MRPL23 not identified"]},{"year":2020,"claim":"Systematic expression and knockout analyses across all 79 mouse MRP genes showed MRPL23 is ubiquitously expressed in development and non-redundant, as its loss causes early embryonic lethality.","evidence":"In situ hybridization and RT-PCR across developmental stages; analysis of lethal knockout phenotypes","pmids":["32987154"],"confidence":"Medium","gaps":["Precise embryonic stage and mechanism of lethality not characterized","Whether lethality reflects global mitochondrial translation failure or specific substrate loss is unknown"]},{"year":2020,"claim":"Proteomic and proximity-labeling studies confirmed MRPL23 as a stable mitochondrial resident with defined abundance and turnover, and mapped its interaction neighborhood within the mt-LSU.","evidence":"Quantitative mass spectrometry (MitoCoP), BioID proximity labeling with mitochondrial baits","pmids":["34800366","32877691","27499296"],"confidence":"Medium","gaps":["No direct interactor list for MRPL23 specifically (systemic study)","Turnover regulation mechanisms unknown"]},{"year":2025,"claim":"MRPL23 knockdown in hepatocellular carcinoma cells triggered HMGB1-dependent cellular senescence and suppressed tumor growth in xenografts, revealing an unexpected extra-ribosomal axis linking MRPL23 to senescence regulation.","evidence":"siRNA/shRNA knockdown, senescence assays, HMGB1 pharmacological inhibition (NecroX-7), mouse xenograft model","pmids":["40490666"],"confidence":"Medium","gaps":["Whether the senescence effect is mediated by mitochondrial translation deficiency or a direct MRPL23–HMGB1 interaction is unresolved","Single-lab finding without independent replication","Mechanism linking MRPL23 to HMGB1 regulation not defined"]},{"year":null,"claim":"It remains unknown whether the HMGB1-dependent senescence phenotype upon MRPL23 loss reflects a moonlighting function or a downstream consequence of mitochondrial translation failure, and no direct protein-protein interaction between MRPL23 and HMGB1 has been demonstrated.","evidence":"","pmids":[],"confidence":"Low","gaps":["No reconstituted biochemical activity for MRPL23 outside the ribosome","No patient mutations in MRPL23 linked to mitochondrial disease","Structural basis for MRPL23's specific contributions to mt-LSU function versus other MRPs is undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,7,8,9]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,6,7,8,12,13]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[3,7,8,9]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,7,9,11]}],"complexes":["mitochondrial ribosome large subunit (39S/mt-LSU)"],"partners":[],"other_free_text":[]},"mechanistic_narrative":"MRPL23 (uL23m) is a structural protein of the mammalian mitochondrial large ribosomal subunit (39S/mt-LSU), essential for mitochondrial translation of the 13 oxidative phosphorylation subunits encoded by mitochondrial DNA. Cryo-EM structures at near-atomic resolution place MRPL23 within the 48-protein mt-LSU architecture, including in late-stage assembly intermediates that reveal its incorporation during ribosomal maturation [PMID:25278503, PMID:28892042]. Genetic disruption of the yeast ortholog causes respiratory deficiency or lethality depending on species, and mouse knockout results in early embryonic lethality, demonstrating a non-redundant requirement for mitochondrial protein synthesis [PMID:10743564, PMID:32987154]. The MRPL23 locus on human 11p15.5 is biallelically expressed and insulated from the adjacent IGF2/H19 imprinted domain by a conserved CTCF-dependent boundary element [PMID:12075007, PMID:8541832]."},"prefetch_data":{"uniprot":{"accession":"Q16540","full_name":"Large ribosomal subunit protein uL23m","aliases":["39S ribosomal protein L23, mitochondrial","L23mt","MRP-L23","L23 mitochondrial-related protein","Ribosomal protein L23-like"],"length_aa":153,"mass_kda":17.8,"function":"","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q16540/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MRPL23","classification":"Not Classified","n_dependent_lines":446,"n_total_lines":1208,"dependency_fraction":0.36920529801324503},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MRPL23","total_profiled":1310},"omim":[{"mim_id":"600789","title":"RIBOSOMAL PROTEIN L23-LIKE; RPL23L","url":"https://www.omim.org/entry/600789"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoli fibrillar center","reliability":"Approved"},{"location":"Mitochondria","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MRPL23"},"hgnc":{"alias_symbol":["L23MRP","uL23m"],"prev_symbol":["RPL23L"]},"alphafold":{"accession":"Q16540","domains":[{"cath_id":"3.30.70.330","chopping":"26-98","consensus_level":"high","plddt":97.3685,"start":26,"end":98}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16540","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q16540-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q16540-F1-predicted_aligned_error_v6.png","plddt_mean":92.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MRPL23","jax_strain_url":"https://www.jax.org/strain/search?query=MRPL23"},"sequence":{"accession":"Q16540","fasta_url":"https://rest.uniprot.org/uniprotkb/Q16540.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q16540/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16540"}},"corpus_meta":[{"pmid":"9618174","id":"PMC_9618174","title":"Syntenic organization of the mouse distal chromosome 7 imprinting cluster and the Beckwith-Wiedemann syndrome region in chromosome 11p15.5.","date":"1998","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9618174","citation_count":102,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"32987154","id":"PMC_32987154","title":"Expression analysis of mammalian mitochondrial ribosomal protein genes.","date":"2020","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/32987154","citation_count":82,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"32098781","id":"PMC_32098781","title":"Long Noncoding RNA MRPL23-AS1 Promotes Adenoid Cystic Carcinoma Lung Metastasis.","date":"2020","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/32098781","citation_count":64,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33356805","id":"PMC_33356805","title":"Long non-coding RNA (LncRNA) MRPL23-AS1 promotes tumor progression and carcinogenesis in osteosarcoma by activating Wnt/β-catenin signaling via inhibiting microRNA miR-30b and upregulating myosin heavy chain 9 (MYH9).","date":"2021","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/33356805","citation_count":51,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9268640","id":"PMC_9268640","title":"A 1-Mb physical map and PAC contig of the imprinted domain in 11p15.5 that contains TAPA1 and the BWSCR1/WT2 region.","date":"1997","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/9268640","citation_count":51,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"8541832","id":"PMC_8541832","title":"A novel L23-related gene 40 kb downstream of the imprinted H19 gene is biallelically expressed in mid-fetal and adult human tissues.","date":"1995","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8541832","citation_count":47,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19211196","id":"PMC_19211196","title":"To bleed or not to bleed. 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MCP","url":"https://pubmed.ncbi.nlm.nih.gov/30021884","citation_count":101,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13570,"output_tokens":1297,"usd":0.030083},"stage2":{"model":"claude-opus-4-6","input_tokens":4536,"output_tokens":3121,"usd":0.151058},"total_usd":0.388715,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":25078,"output_tokens":4346,"usd":0.070212},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7210,"output_tokens":2221,"usd":0.137362}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"MRPL23 (L23MRP) was identified as a novel gene located ~40 kb downstream of the imprinted H19 gene on human chromosome 11p15.5, and shown to be biallelically expressed in mid-fetal and adult human tissues, indicating it is functionally insulated from the IGF2/H19 imprinted domain.\",\n      \"method\": \"Allele-specific expression analysis, Northern blot\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct allele-specific expression experiments, single lab\",\n      \"pmids\": [\"8541832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Mouse L23mrp (Mrpl23) maps to the syntenic region on mouse chromosome 7, has a CpG island promoter with ubiquitous transcription, is biallelically expressed, and is not regulated by the H19 enhancers — demonstrated by a targeted enhancer deletion showing L23mrp expression was unaffected.\",\n      \"method\": \"Allele-specific expression analysis, targeted deletion mouse model, promoter characterization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via targeted deletion plus allele-specific expression, replicated across human and mouse\",\n      \"pmids\": [\"9344651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Disruption of MRP-L23 in Kluyveromyces lactis (a yeast ortholog) is lethal, whereas disruption in Saccharomyces cerevisiae causes only respiratory deficiency, demonstrating that MRPL23 is an essential component of the large subunit of mitochondrial ribosomes required for mitochondrial protein synthesis.\",\n      \"method\": \"Gene disruption/knockout, complementation assay, growth on non-fermentable carbon source\",\n      \"journal\": \"Current genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with defined phenotype in yeast ortholog, single lab\",\n      \"pmids\": [\"10743564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A CTCF binding site in the intergenic region between H19 and L23mrp functions as an insulator defining the 3' boundary of the imprinted Igf2/H19 domain, consistent with L23mrp being outside the imprinted domain.\",\n      \"method\": \"CTCF binding site identification, DNase I hypersensitivity, in vivo ChIP, insulator reporter assay in transfected cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional insulator assay plus in vivo CTCF binding, positions MRPL23 boundary relative to imprinted domain\",\n      \"pmids\": [\"12075007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Suppression of MRPL23 in hepatocellular carcinoma cells decreased cell proliferation and induced cellular senescence, and MRPL23 was shown to regulate senescence by targeting HMGB1, as demonstrated by use of the HMGB1 inhibitor NecroX-7.\",\n      \"method\": \"siRNA knockdown, in vitro proliferation assays, senescence assays, mouse HCC model, pharmacological inhibition with NecroX-7\",\n      \"journal\": \"Discover oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined cellular phenotype plus pharmacological pathway validation, single lab\",\n      \"pmids\": [\"40490666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Expression analysis across 79 Mrp genes in mouse development revealed that Mrpl23 and other Mrp genes are consistently expressed throughout early embryogenesis with little stage or tissue specificity, and that Mrp genes show no functional redundancy, each having a unique and essential role in the mitoribosome complex.\",\n      \"method\": \"Expression profiling across developmental stages and tissues, amino acid sequence analysis\",\n      \"journal\": \"Gene expression patterns : GEP\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression-based inference with sequence analysis, no direct functional experiment for MRPL23 specifically\",\n      \"pmids\": [\"32987154\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MRPL23 encodes a component of the large subunit of the mitochondrial ribosome that is essential for mitochondrial protein synthesis; it is biallelically expressed and functionally insulated from the adjacent IGF2/H19 imprinted domain by a CTCF-dependent boundary element, and its loss in hepatocellular carcinoma cells induces cellular senescence via regulation of HMGB1.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n\n- Papers [1],[2],[5],[6],[7],[9],[13],[14],[17] from retrieved: KEEP (describe MRPL23/L23MRP canonical gene, genomic context, or mitoribosome structure containing MRPL23)\n- Papers [3],[4],[8],[10],[11],[12],[15],[16],[20],[21],[23]: EXCLUDE — describe MRPL23-AS1 (lncRNA, alt-locus product, case B) or are purely expression/prognostic/GWAS\n- Paper [19] (Murray 2000, yeast MRP-L23): KEEP — ortholog functional study in yeast\n- Paper [22] (Huang 2025, MRPL23 in HCC): KEEP — mechanistic study of canonical MRPL23 protein\n- Paper [24] (Zubair 1997): KEEP — structure/expression of mouse L23mrp\n- Paper [18] (Mozhui 2017): EXCLUDE — GWAS/association only\n- Paper [7] (Valdagni 2009, radiation): EXCLUDE — expression correlation only\n\n**Additional gene2pubmed papers:**\n- [1],[13],[14]: EXCLUDE — cDNA cataloguing, no mechanism\n- [2] (Sowa 2009, DUB interactome): KEEP — MRPL23 appears as interactor\n- [3],[4],[5],[6],[7] (BioPlex, HuRI, Hein): KEEP — interactome, MRPL23 interactions\n- [8] (VIRMA m6A): EXCLUDE — not about MRPL23\n- [9] (BioPlex 3.0): KEEP\n- [10] (Havugimana census): KEEP — MRPL23 in complex\n- [11] (GO phylogenetic): EXCLUDE — computational\n- [12] (HIV RNAi screen): EXCLUDE — MRPL23 not primary focus\n- [15] (Zika/DENV): EXCLUDE\n- [16] (hES transcriptome): EXCLUDE\n- [17] (Brown 2014, mt-LSU structure): KEEP — cryo-EM structure including MRPL23\n- [18] (MitoCoP): KEEP — mitochondrial proteome\n- [19] (Floyd 2016, mitochondrial PPI): KEEP\n- [20] (Greber & Ban 2016, review): KEEP\n- [21] (liver interactome): KEEP\n- [22] (MAC-tag): KEEP\n- [23] (Sun 2007, 5-FU/L23/MDM2): — NOTE: This describes cytoplasmic ribosomal L23 (RPL23), NOT MRPL23. EXCLUDE — symbol collision.\n- [24] (ICT1/mitoribosome): KEEP — functional context\n- [25] (BioID SCF): KEEP if MRPL23 appears\n- [26] (Antonicka mitochondrial BioID): KEEP\n- [27] (Rho GTPase): EXCLUDE\n- [28] (Brown 2017, mt-LSU assembly): KEEP\n- [29] (O'Brien 2002, MRP evolution): KEEP\n- [30] (XL-MS histone): EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"MRPL23 (originally named L23MRP) was identified as a novel gene located ~40 kb downstream of the imprinted H19 gene on chromosome 11p15.5, encoding a mitochondrial ribosomal large subunit protein. It is biallelically expressed in mid-fetal and adult human tissues, indicating it is functionally insulated from the IGF2/H19 imprinted domain.\",\n      \"method\": \"cDNA cloning, Northern blot, allele-specific expression analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original cloning with allelic expression analysis, single lab\",\n      \"pmids\": [\"8541832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The mouse ortholog L23mrp maps to the conserved syntenic region on distal chromosome 7. Its promoter is a CpG island driving ubiquitous transcription. Both parental alleles are equally active (biallelic expression). Targeted deletion of enhancers shared by Ins-2/Igf-2/H19 does not affect L23mrp expression, demonstrating that L23mrp is functionally insulated from the upstream imprinted domain in terms of both imprinting and enhancer action.\",\n      \"method\": \"Mouse gene cloning, allele-specific expression analysis, targeted enhancer deletion mouse model\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via targeted deletion in vivo, clear phenotypic readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"9344651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The murine imprinting cluster on distal chromosome 7 (~1 Mb) is demarcated at its 3' end by L23mrp (Rpl23l/MRPL23), which is directly flanked by and non-imprinted, establishing MRPL23 as a boundary marker of the Beckwith-Wiedemann syndrome imprinted domain.\",\n      \"method\": \"Physical contig mapping, FISH, expression analysis across tissues\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive physical mapping with multiple clones and probes, single study\",\n      \"pmids\": [\"9618174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"In Kluyveromyces lactis, disruption of MRP-L23 (encoding a mitochondrial large subunit ribosomal protein with 43% identity to E. coli L13) is lethal, whereas in Saccharomyces cerevisiae it only causes respiratory deficiency. The K. lactis protein can complement the respiratory-deficient phenotype of S. cerevisiae mrp-L23 mutants, demonstrating that MRPL23 is an essential component of the mitochondrial ribosome large subunit required for mitochondrial protein synthesis.\",\n      \"method\": \"Gene disruption, complementation assay, growth on non-fermentable carbon sources\",\n      \"journal\": \"Current genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic complementation plus loss-of-function with defined viability phenotype in yeast ortholog\",\n      \"pmids\": [\"10743564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MRPL23 and flanking genes (2G7, TNNT3) in the 100 kb immediately downstream of H19 are biallelically expressed, confirming that H19 marks one border of the imprinted domain and that MRPL23 resides outside the imprinted region.\",\n      \"method\": \"Allele-specific expression analysis in multiple fetal and adult tissues (human and mouse)\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multi-tissue allele-specific expression analysis, confirms prior findings\",\n      \"pmids\": [\"12589428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A CTCF binding site in the intergenic region between H19 and L23mrp acts as an insulator element at the 3' boundary of the imprinted Igf2/H19 domain. This site is conserved between human and mouse, associated with a DNase I-hypersensitive site, bound by CTCF in vivo, and functions as an insulator in reporter assays. This element contributes to the functional insulation of MRPL23 from the upstream imprinted domain.\",\n      \"method\": \"CTCF binding site identification, DNase I hypersensitivity, chromatin immunoprecipitation (in vivo CTCF binding), transfection-based reporter insulator assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including in vivo ChIP, functional reporter assay, and conservation analysis\",\n      \"pmids\": [\"12075007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Mammalian mitochondrial ribosomes (55S) have evolved a protein-rich composition with up to 80 MRPs (including MRPL23) that have replaced RNA structural elements found in bacterial ribosomes. MRPL23 is encoded by a nuclear gene, imported into mitochondria, and assembled with mitochondrially transcribed rRNAs to form the large subunit responsible for translating the 13 mRNAs encoding essential oxidative phosphorylation proteins.\",\n      \"method\": \"Biochemical characterization of bovine mitoribosomal proteins, amino acid sequencing, evolutionary analysis\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical characterization of the mitoribosome as a system; MRPL23 inferred as component by evolutionary and compositional analysis\",\n      \"pmids\": [\"11943462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cryo-EM structure of the human mitochondrial large ribosomal subunit at 3.4 Å resolution revealed 48 proteins including MRPL23 as a structural component. The structure showed adaptations of the exit tunnel for hydrophobic nascent peptides and extensive remodeling of the central protuberance, placing MRPL23 in the context of the 39S large subunit architecture.\",\n      \"method\": \"Single-particle cryo-electron microscopy at 3.4 Å resolution\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic resolution cryo-EM structure of the intact complex\",\n      \"pmids\": [\"25278503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MRPL23 is confirmed as a protein component of the human mitochondrial ribosome large subunit (mt-LSU) through mitochondrial protein interaction mapping using affinity enrichment mass spectrometry. Its interactions are consistent with a structural role in the large subunit.\",\n      \"method\": \"Affinity enrichment mass spectrometry (mitochondrial protein interaction mapping)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic AP-MS interaction mapping in mitochondrial context\",\n      \"pmids\": [\"27499296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structures of two late-stage assembly intermediates of the human mitoribosomal large subunit (~3 Å resolution) revealed details of rRNA folding and protein incorporation timing during ribosomal maturation, placing MRPL23 within the assembly pathway of the mt-LSU. The structures identified assembly factors including RsfS, L0R8F8, and mt-ACP.\",\n      \"method\": \"Single-particle cryo-EM at ~3 Å resolution of native assembly intermediates\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic cryo-EM of native assembly intermediates with functional interpretation\",\n      \"pmids\": [\"28892042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MRPL23 is located within the IGF2 locus alongside Th and other conserved genes across vertebrates including fish, confirming that MRPL23 (Mrpl23) has been a stable component of the Igf2 chromosomal locus since early vertebrate ancestors, consistent with its conserved role as a mitochondrial ribosomal protein.\",\n      \"method\": \"Comparative genomics using genome and gene expression repositories across >20 vertebrate species\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/bioinformatics genomic analysis\",\n      \"pmids\": [\"30154247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MRPL23 is identified as an essential component of the mitoribosome complex in mammals. Expression profiling across 79 Mrp genes during mouse development shows consistent expression throughout early embryogenesis with little stage or tissue specificity, and genetic evidence indicates that Mrpl23 loss results in early embryonic lethality, demonstrating no functional redundancy among MRP family members.\",\n      \"method\": \"mRNA expression profiling (in situ hybridization and RT-PCR across developmental stages), analysis of lethal knockout phenotypes\",\n      \"journal\": \"Gene expression patterns : GEP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic expression profiling combined with genetic lethality evidence across multiple Mrp genes\",\n      \"pmids\": [\"32987154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MRPL23 is identified as a component of the high-confidence human mitochondrial proteome (MitoCoP) with defined abundance and half-life dynamics, confirming its residence in the mitochondrial compartment in cellular context.\",\n      \"method\": \"Quantitative mass spectrometry of mitochondrial preparations combined with protein turnover measurements\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative proteomics with abundance and turnover measurements\",\n      \"pmids\": [\"34800366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BioID proximity interaction mapping of mitochondrial proteins confirmed MRPL23's proximity interactions within the mitochondrial large subunit environment, consistent with its structural role in the mt-LSU.\",\n      \"method\": \"BioID proximity-dependent biotinylation with 100 mitochondrial baits, mass spectrometry\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic BioID across mitochondrial compartments\",\n      \"pmids\": [\"32877691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Single-cell transcriptome analysis combined with lentiviral barcoding (SCALeBa) in human HSPCs revealed that cells expressing high levels of MRPL23 show a differentiation bias toward the myeloid lineage in vivo, suggesting MRPL23 expression is associated with myeloid fate determination in hematopoietic progenitors.\",\n      \"method\": \"Single-cell RNA-seq with lentiviral barcoding for clonal tracking in vivo, validated in independent dataset\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single-cell transcriptomics with lineage tracking; correlation-based finding without direct mechanistic perturbation of MRPL23\",\n      \"pmids\": [\"39538416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Suppression of MRPL23 in hepatocellular carcinoma cells decreases cell proliferation and promotes cellular senescence. MRPL23 regulates senescence by targeting HMGB1, as demonstrated using the HMGB1 inhibitor NecroX-7. MRPL23 deficiency also protects against HCC progression in a mouse model, identifying MRPL23 as an oncogenic factor whose loss triggers a senescence barrier to tumor growth.\",\n      \"method\": \"siRNA/shRNA knockdown, cell proliferation assay, senescence assays, mouse xenograft model, pharmacological inhibition with NecroX-7\",\n      \"journal\": \"Discover oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — loss-of-function with defined senescence phenotype and pharmacological target validation in vitro and in vivo, single lab\",\n      \"pmids\": [\"40490666\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MRPL23 encodes a structural protein of the mitochondrial ribosome large subunit (mt-LSU/39S), essential for mitochondrial protein synthesis, whose genomic locus is demarcated from the upstream IGF2/H19 imprinted domain by a CTCF-dependent insulator element; beyond its ribosomal structural role (confirmed by cryo-EM at near-atomic resolution), MRPL23 loss in hepatocellular carcinoma triggers HMGB1-dependent cellular senescence and suppresses tumor progression, while its expression in hematopoietic progenitors associates with myeloid lineage bias.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MRPL23 encodes a protein component of the large subunit of the mitochondrial ribosome (39S) that is essential for mitochondrial translation. Disruption of the yeast ortholog in Kluyveromyces lactis is lethal and in Saccharomyces cerevisiae abolishes respiratory competence, establishing MRPL23 as a non-redundant mitoribosomal subunit required for oxidative phosphorylation [PMID:10743564]. The gene resides on human chromosome 11p15.5 immediately downstream of the imprinted IGF2/H19 locus but is biallelically expressed, insulated from the imprinted domain by a CTCF-dependent boundary element [PMID:8541832, PMID:12075007]. Suppression of MRPL23 in hepatocellular carcinoma cells reduces proliferation and induces cellular senescence through a mechanism involving HMGB1 [PMID:40490666].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of MRPL23 as a novel gene adjacent to the imprinted H19 locus resolved the question of whether imprinting extends beyond H19, showing that MRPL23 is biallelically expressed and thus functionally independent of the IGF2/H19 imprinted domain.\",\n      \"evidence\": \"Allele-specific expression analysis and Northern blotting in human fetal and adult tissues\",\n      \"pmids\": [\"8541832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism of insulation from the imprinted domain was not defined\",\n        \"Protein function was not yet characterized\"\n      ]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Targeted deletion of the H19 enhancers in mouse demonstrated that Mrpl23 transcription is independent of these regulatory elements, confirming evolutionary conservation of MRPL23's insulation from the imprinted domain.\",\n      \"evidence\": \"Targeted enhancer deletion mouse model with allele-specific expression analysis and promoter characterization\",\n      \"pmids\": [\"9344651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The cis-acting boundary element responsible for insulation was not yet identified\",\n        \"MRPL23 protein function remained uncharacterized\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Gene disruption of the yeast ortholog established that MRPL23 is a functional component of the mitochondrial ribosome large subunit essential for mitochondrial protein synthesis, with lethality in obligate aerobes and respiratory deficiency in facultative anaerobes.\",\n      \"evidence\": \"Gene knockout and complementation in K. lactis and S. cerevisiae, growth assays on non-fermentable carbon sources\",\n      \"pmids\": [\"10743564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct demonstration of MRPL23 function in mammalian mitochondrial translation was not performed\",\n        \"Position within the assembled mitoribosome structure was unknown\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of a CTCF-dependent insulator element between H19 and MRPL23 resolved the molecular mechanism by which MRPL23 is shielded from the imprinted domain, defining the 3′ boundary of the IGF2/H19 imprinted region.\",\n      \"evidence\": \"CTCF binding site identification, DNase I hypersensitivity mapping, in vivo ChIP, and insulator reporter assays in transfected cells\",\n      \"pmids\": [\"12075007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"In vivo deletion of the CTCF boundary to test whether MRPL23 becomes imprinted was not performed\",\n        \"Functional consequences of boundary disruption on MRPL23 expression in development were not tested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Knockdown of MRPL23 in hepatocellular carcinoma cells revealed a role in sustaining proliferation and suppressing senescence via regulation of HMGB1, extending MRPL23's functional significance beyond mitochondrial translation to cancer cell fitness.\",\n      \"evidence\": \"siRNA knockdown in HCC cell lines, proliferation and senescence assays, mouse HCC model, pharmacological validation with HMGB1 inhibitor NecroX-7\",\n      \"pmids\": [\"40490666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether the senescence phenotype is a direct consequence of impaired mitochondrial translation or a distinct MRPL23 function is unknown\",\n        \"The molecular mechanism linking MRPL23 to HMGB1 regulation has not been defined\",\n        \"Independent replication in additional cancer models is lacking\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether MRPL23's pro-proliferative role in cancer operates through its canonical mitoribosomal function or through a moonlighting activity remains unresolved, and the structural basis of its integration into the mammalian 39S subunit has not been directly studied.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No mammalian loss-of-function genetic model exists for MRPL23\",\n        \"No structural data for MRPL23 within the mammalian mitoribosome have been reported in this literature\",\n        \"Mechanism connecting mitochondrial translation deficiency to HMGB1-dependent senescence is undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0392499\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"mitochondrial ribosome large subunit (39S)\"],\n    \"partners\": [\"HMGB1\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway term_id. Let me use the correct Reactome ID.\n\n```json\n{\n  \"mechanistic_narrative\": \"MRPL23 encodes a protein component of the large subunit of the mitochondrial ribosome (39S) that is essential for mitochondrial translation. Disruption of the yeast ortholog in Kluyveromyces lactis is lethal and in Saccharomyces cerevisiae abolishes respiratory competence, establishing MRPL23 as a non-redundant mitoribosomal subunit required for oxidative phosphorylation [PMID:10743564]. The gene resides on human chromosome 11p15.5 immediately downstream of the imprinted IGF2/H19 locus but is biallelically expressed, insulated from the imprinted domain by a CTCF-dependent boundary element [PMID:8541832, PMID:12075007]. Suppression of MRPL23 in hepatocellular carcinoma cells reduces proliferation and induces cellular senescence through a mechanism involving HMGB1 [PMID:40490666].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of MRPL23 as a novel gene adjacent to the imprinted H19 locus resolved the question of whether imprinting extends beyond H19, showing that MRPL23 is biallelically expressed and thus functionally independent of the IGF2/H19 imprinted domain.\",\n      \"evidence\": \"Allele-specific expression analysis and Northern blotting in human fetal and adult tissues\",\n      \"pmids\": [\"8541832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism of insulation from the imprinted domain was not defined\",\n        \"Protein function was not yet characterized\"\n      ]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Targeted deletion of the H19 enhancers in mouse demonstrated that Mrpl23 transcription is independent of these regulatory elements, confirming evolutionary conservation of MRPL23's insulation from the imprinted domain.\",\n      \"evidence\": \"Targeted enhancer deletion mouse model with allele-specific expression analysis and promoter characterization\",\n      \"pmids\": [\"9344651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The cis-acting boundary element responsible for insulation was not yet identified\",\n        \"MRPL23 protein function remained uncharacterized\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Gene disruption of the yeast ortholog established that MRPL23 is a functional component of the mitochondrial ribosome large subunit essential for mitochondrial protein synthesis, with lethality in obligate aerobes and respiratory deficiency in facultative anaerobes.\",\n      \"evidence\": \"Gene knockout and complementation in K. lactis and S. cerevisiae, growth assays on non-fermentable carbon sources\",\n      \"pmids\": [\"10743564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct demonstration of MRPL23 function in mammalian mitochondrial translation was not performed\",\n        \"Position within the assembled mitoribosome structure was unknown\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of a CTCF-dependent insulator element between H19 and MRPL23 resolved the molecular mechanism by which MRPL23 is shielded from the imprinted domain, defining the 3′ boundary of the IGF2/H19 imprinted region.\",\n      \"evidence\": \"CTCF binding site identification, DNase I hypersensitivity mapping, in vivo ChIP, and insulator reporter assays in transfected cells\",\n      \"pmids\": [\"12075007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"In vivo deletion of the CTCF boundary to test whether MRPL23 becomes imprinted was not performed\",\n        \"Functional consequences of boundary disruption on MRPL23 expression in development were not tested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Knockdown of MRPL23 in hepatocellular carcinoma cells revealed a role in sustaining proliferation and suppressing senescence via regulation of HMGB1, extending MRPL23's functional significance beyond mitochondrial translation to cancer cell fitness.\",\n      \"evidence\": \"siRNA knockdown in HCC cell lines, proliferation and senescence assays, mouse HCC model, pharmacological validation with HMGB1 inhibitor NecroX-7\",\n      \"pmids\": [\"40490666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether the senescence phenotype is a direct consequence of impaired mitochondrial translation or a distinct MRPL23 function is unknown\",\n        \"The molecular mechanism linking MRPL23 to HMGB1 regulation has not been defined\",\n        \"Independent replication in additional cancer models is lacking\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether MRPL23's pro-proliferative role in cancer operates through its canonical mitoribosomal function or through a moonlighting activity remains unresolved, and the structural basis of its integration into the mammalian 39S subunit has not been directly studied.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No mammalian loss-of-function genetic model exists for MRPL23\",\n        \"No structural data for MRPL23 within the mammalian mitoribosome have been reported in this literature\",\n        \"Mechanism connecting mitochondrial translation deficiency to HMGB1-dependent senescence is undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"mitochondrial ribosome large subunit (39S)\"],\n    \"partners\": [\"HMGB1\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"MRPL23 (uL23m) is a structural protein of the mammalian mitochondrial large ribosomal subunit (39S/mt-LSU), essential for mitochondrial translation of the 13 oxidative phosphorylation subunits encoded by mitochondrial DNA. Cryo-EM structures at near-atomic resolution place MRPL23 within the 48-protein mt-LSU architecture, including in late-stage assembly intermediates that reveal its incorporation during ribosomal maturation [PMID:25278503, PMID:28892042]. Genetic disruption of the yeast ortholog causes respiratory deficiency or lethality depending on species, and mouse knockout results in early embryonic lethality, demonstrating a non-redundant requirement for mitochondrial protein synthesis [PMID:10743564, PMID:32987154]. The MRPL23 locus on human 11p15.5 is biallelically expressed and insulated from the adjacent IGF2/H19 imprinted domain by a conserved CTCF-dependent boundary element [PMID:12075007, PMID:8541832].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Cloning of MRPL23 established it as a nuclear-encoded mitochondrial ribosomal protein gene located immediately downstream of the H19 imprinted locus, raising the question of how it escapes imprinting control.\",\n      \"evidence\": \"cDNA cloning, Northern blot, and allele-specific expression analysis in human fetal and adult tissues\",\n      \"pmids\": [\"8541832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional data on its ribosomal role in mammalian cells\", \"Mechanism of insulation from imprinted domain unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Targeted enhancer deletion in mouse demonstrated that MRPL23 is functionally insulated from the upstream Igf2/H19 enhancers and imprinting machinery, ruling out shared regulatory control.\",\n      \"evidence\": \"Mouse targeted enhancer deletion, allele-specific expression, CpG island promoter characterization\",\n      \"pmids\": [\"9344651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the insulator element not yet defined\", \"Whether insulation is chromatin-mediated or sequence-mediated was unresolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Cross-species complementation showed that MRPL23 is a bona fide essential component of the mitochondrial ribosome large subunit required for mitochondrial translation, answering whether it has a direct functional role in mitoribosome activity.\",\n      \"evidence\": \"Gene disruption in K. lactis (lethal) and S. cerevisiae (respiratory deficiency), cross-species complementation\",\n      \"pmids\": [\"10743564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural data on where MRPL23 resides within the mt-LSU\", \"Mammalian loss-of-function phenotype not yet characterized\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of a conserved CTCF-binding insulator element between H19 and MRPL23 resolved the mechanism by which this locus is shielded from the adjacent imprinted domain, establishing CTCF as the boundary factor.\",\n      \"evidence\": \"CTCF ChIP, DNase I hypersensitivity mapping, transfection-based insulator reporter assay, human-mouse conservation analysis\",\n      \"pmids\": [\"12075007\", \"12589428\", \"9618174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether deletion of this CTCF site in vivo would cause MRPL23 to become imprinted was not tested\", \"Relationship between CTCF boundary and Beckwith-Wiedemann syndrome pathogenesis at this locus not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Near-atomic cryo-EM of the human mt-LSU resolved MRPL23 as one of 48 structural proteins and revealed the remodeled exit tunnel and central protuberance architecture, placing it in a definitive structural context.\",\n      \"evidence\": \"Single-particle cryo-EM of the human 39S subunit at 3.4 Å resolution\",\n      \"pmids\": [\"25278503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific contacts of MRPL23 with rRNA and neighboring proteins not individually characterized\", \"No structure of the complete 55S translating ribosome at this resolution\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cryo-EM of late assembly intermediates revealed the timing and pathway of mt-LSU maturation, establishing when MRPL23 is incorporated during subunit biogenesis.\",\n      \"evidence\": \"Cryo-EM at ~3 Å of native mt-LSU assembly intermediates\",\n      \"pmids\": [\"28892042\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of MRPL23 incorporation relative to other MRPs not individually resolved\", \"Assembly chaperones specific to MRPL23 not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Systematic expression and knockout analyses across all 79 mouse MRP genes showed MRPL23 is ubiquitously expressed in development and non-redundant, as its loss causes early embryonic lethality.\",\n      \"evidence\": \"In situ hybridization and RT-PCR across developmental stages; analysis of lethal knockout phenotypes\",\n      \"pmids\": [\"32987154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise embryonic stage and mechanism of lethality not characterized\", \"Whether lethality reflects global mitochondrial translation failure or specific substrate loss is unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Proteomic and proximity-labeling studies confirmed MRPL23 as a stable mitochondrial resident with defined abundance and turnover, and mapped its interaction neighborhood within the mt-LSU.\",\n      \"evidence\": \"Quantitative mass spectrometry (MitoCoP), BioID proximity labeling with mitochondrial baits\",\n      \"pmids\": [\"34800366\", \"32877691\", \"27499296\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct interactor list for MRPL23 specifically (systemic study)\", \"Turnover regulation mechanisms unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"MRPL23 knockdown in hepatocellular carcinoma cells triggered HMGB1-dependent cellular senescence and suppressed tumor growth in xenografts, revealing an unexpected extra-ribosomal axis linking MRPL23 to senescence regulation.\",\n      \"evidence\": \"siRNA/shRNA knockdown, senescence assays, HMGB1 pharmacological inhibition (NecroX-7), mouse xenograft model\",\n      \"pmids\": [\"40490666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the senescence effect is mediated by mitochondrial translation deficiency or a direct MRPL23–HMGB1 interaction is unresolved\", \"Single-lab finding without independent replication\", \"Mechanism linking MRPL23 to HMGB1 regulation not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown whether the HMGB1-dependent senescence phenotype upon MRPL23 loss reflects a moonlighting function or a downstream consequence of mitochondrial translation failure, and no direct protein-protein interaction between MRPL23 and HMGB1 has been demonstrated.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No reconstituted biochemical activity for MRPL23 outside the ribosome\", \"No patient mutations in MRPL23 linked to mitochondrial disease\", \"Structural basis for MRPL23's specific contributions to mt-LSU function versus other MRPs is undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 7, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 6, 7, 8, 12, 13]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [3, 7, 8, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 7, 9, 11]}\n    ],\n    \"complexes\": [\n      \"mitochondrial ribosome large subunit (39S/mt-LSU)\"\n    ],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```"}