{"gene":"RPL10A","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2022,"finding":"RPL10A/uL1-containing ribosomes are upregulated in the primitive streak during human embryonic stem cell differentiation and are enriched on Wnt pathway mRNAs; Rpl10a loss-of-function in mice causes posterior trunk truncations and inhibits paraxial mesoderm production, with ribosome profiling showing decreased translation of mesoderm regulators including Wnt pathway mRNAs; RPL10A/uL1 regulates canonical and non-canonical Wnt signaling during differentiation.","method":"Quantitative mass spectrometry during hESC differentiation, Rpl10a loss-of-function mouse genetics, ribosome profiling, ribosome immunoprecipitation to identify mRNA enrichment, stem cell differentiation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (proteomics, ribosome profiling, genetic loss-of-function in mouse and culture) converging on same mechanistic conclusion in a single rigorous study","pmids":["36123354"],"is_preprint":false},{"year":2016,"finding":"RPL10A (L10a/RPL-1 in C. elegans) directly and specifically binds an evolutionarily conserved 39-nt RNA element (L10ARE) located between two alternative 5' splice sites in its own pre-mRNA, switching splice site choice to generate an NMD-susceptible transcript, thereby autoregulating its own expression level; this AS-NMD autoregulation is conserved in vertebrates.","method":"Transcriptome analysis of NMD-defective C. elegans mutants, RNA-binding assay (L10a binding to L10ARE), splice-site reporter assays, RNAi knockdown of rp genes with splicing readout","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct RNA-binding assay with defined element, functional splicing readout, conservation validated in vertebrates, multiple orthogonal methods","pmids":["26961311"],"is_preprint":false},{"year":2020,"finding":"Artificially increased levels of NMD-susceptible rpl10a transcripts in zebrafish larvae significantly impaired T cell development, identifying an extraribosomal tissue-specific function for rpl10a in the immune system; this effect is mediated through dysregulated autoregulation of rpl10a splicing downstream of upf1/NMD pathway.","method":"Zebrafish upf1 mutant analysis, RNA-seq for differentially expressed genes, injection of NMD-susceptible rpl10a transcripts into zebrafish larvae with T cell development readout","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean in vivo gain-of-function experiment with specific developmental phenotype, single lab, two complementary approaches (mutant analysis + transcript injection)","pmids":["32571908"],"is_preprint":false},{"year":2019,"finding":"Loss of rpl10a function in zebrafish (morpholino knockdown and CRISPR-Cas9 5-bp deletion knockout) causes embryonic developmental defects including reduced expression of erythroid synthesis genes (gata1, hbae3, hbbe1), increased tp53 expression, reduced primordial germ cell marker gene expression (nanos1, vasa), and apoptosis; morphant phenotype was rescued by rpl10a mRNA co-injection.","method":"Morpholino antisense oligonucleotide knockdown, CRISPR-Cas9 knockout generating homozygous deletion, mRNA rescue experiment, gene expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent loss-of-function approaches (morpholino + CRISPR) with mRNA rescue, single lab","pmids":["31792295"],"is_preprint":false},{"year":2005,"finding":"Ribosomal protein L10a physically interacts with trichosanthin (a type I ribosome-inactivating protein); the interaction was identified by Sepharose affinity purification and confirmed by in vitro binding assay; surface plasmon resonance kinetics revealed a Kd of 7.78 nM; the interaction correlates with the ribosome-inactivating activity of trichosanthin, suggesting L10a is involved in the mechanism by which trichosanthin inactivates ribosomes.","method":"Trichosanthin-coupled Sepharose affinity purification, mass spectrometry identification, in vitro binding assay, surface plasmon resonance (SPR) kinetics, mutagenesis of trichosanthin","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding reconstituted and quantified by SPR, mutagenesis correlation, single lab with multiple orthogonal methods","pmids":["16126173"],"is_preprint":false},{"year":2025,"finding":"The human ortholog WDR89 was found in the proxiOME of human RPL10A (the human Rpl1/uL1 ortholog) by TurboID-based proximity labeling, suggesting an evolutionarily conserved chaperone function analogous to yeast Bcl1 for Rpl1; in yeast, the dedicated chaperones Acl1 and Bcl1 directly interact with Rpl1, form a trimeric complex in vitro, and cooperate to ensure nuclear transfer and efficient loading of Rpl1 onto pre-60S subunits.","method":"TurboID-based proximity labeling in human cells, crystal structure of Acl1-Rpl1 complex (yeast), in vitro reconstitution of trimeric complex, mutational analysis, growth assays in yeast double mutants","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — crystal structure and in vitro reconstitution for yeast orthologs with mutational validation; human RPL10A connection is proximity labeling only (Tier 3); preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.09.18.677003"],"is_preprint":true},{"year":2008,"finding":"In Arabidopsis (plant ortholog rpL10A), NIK1 kinase phosphorylates cytosolic rpL10A, which redirects it to the nucleus as part of an antiviral defense response; hyperactive NIK1 promotes nuclear accumulation of phosphorylated rpL10A, kinase-inactive NIK1 fails to do so, and a phosphorylation-defective rpL10A mutant is not redirected to the nucleus; loss of rpL10A function enhances susceptibility to geminivirus infection.","method":"Kinase-substrate assay (NIK1 phosphorylation of rpL10A), co-transfection with nuclear localization readout, NIK1 mutant analysis, phosphorylation-defective rpL10A mutant, virus infection susceptibility assay","journal":"PLoS pathogens","confidence":"Low","confidence_rationale":"Tier 2-3 / Moderate — multiple complementary experiments in plant (non-mammalian, non-ortholog model); while mechanistically detailed, this describes a plant-specific signaling context not conserved in the mammalian gene's known function","pmids":["19112492"],"is_preprint":false},{"year":1996,"finding":"The primary structure of rat ribosomal protein L10a was determined: 217 amino acids, molecular weight 24,815 Da, encoded by a gene present in 7-10 copies in nuclear DNA, with an mRNA of approximately 760 nucleotides; the protein is homologous to eukaryotic and archaebacterial ribosomal proteins.","method":"cDNA sequencing, Southern blot hybridization for gene copy number, Northern blot for mRNA size","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct primary structure determination from cDNA, multiple complementary molecular characterization methods, single lab","pmids":["8607874"],"is_preprint":false}],"current_model":"RPL10A (uL1) is a 60S large ribosomal subunit protein that autoregulates its own expression by directly binding a conserved RNA element in its own pre-mRNA to shift alternative splicing toward an NMD-degraded isoform; RPL10A-containing ribosomes preferentially translate Wnt pathway and mesoderm-specification mRNAs, establishing a specialized translation function that controls cell fate during embryonic development; loss of RPL10A impairs mesoderm production and T cell development in vivo, and dedicated chaperones (WDR89 in humans, Bcl1/Acl1 in yeast) interact with RPL10A/Rpl1 to ensure its safe nuclear delivery and incorporation into pre-60S ribosomal particles."},"narrative":{"mechanistic_narrative":"RPL10A (uL1) is a 60S large ribosomal subunit protein that functions both as a core component of the translation machinery and as a specificity factor that biases ribosomes toward distinct mRNA pools during development [PMID:36123354, PMID:8607874]. RPL10A-containing ribosomes are enriched on Wnt pathway mRNAs and are upregulated in the primitive streak during embryonic stem cell differentiation; loss of Rpl10a in mice impairs paraxial mesoderm production and reduces translation of mesoderm regulators, establishing RPL10A as a control point for cell-fate decisions through specialized translation [PMID:36123354]. RPL10A autoregulates its own abundance by directly binding a conserved 39-nt element (L10ARE) positioned between alternative 5' splice sites in its own pre-mRNA, switching splice-site choice to generate an NMD-susceptible transcript, a feedback loop conserved from C. elegans to vertebrates [PMID:26961311]. Disruption of this autoregulation has tissue-specific consequences: excess NMD-susceptible rpl10a transcript impairs T cell development in zebrafish, and loss of rpl10a function causes broad embryonic defects including reduced erythroid and germ-cell gene expression, p53 induction, and apoptosis [PMID:32571908, PMID:31792295]. Nuclear delivery and pre-60S loading of RPL10A/Rpl1 are managed by dedicated chaperones — yeast Acl1 and Bcl1 form a trimeric complex with Rpl1, and the human ortholog WDR89 appears in the RPL10A proximity interactome [PMID:bio_10.1101_2025.09.18.677003].","teleology":[{"year":1996,"claim":"Establishing the primary structure and gene organization of L10a was the foundational step defining the protein as a conserved eukaryotic/archaebacterial ribosomal protein.","evidence":"cDNA sequencing, Southern and Northern blot characterization in rat","pmids":["8607874"],"confidence":"Medium","gaps":["No functional role assigned beyond sequence homology","No localization or interaction data"]},{"year":2005,"claim":"Identifying a high-affinity physical interaction between L10a and the ribosome-inactivating protein trichosanthin connected L10a to the mechanism by which a toxin inactivates ribosomes.","evidence":"Affinity purification, in vitro binding, SPR kinetics (Kd 7.78 nM), trichosanthin mutagenesis","pmids":["16126173"],"confidence":"Medium","gaps":["Functional consequence of binding for normal ribosome function not addressed","Binding interface on L10a not mapped"]},{"year":2016,"claim":"Discovery that L10a binds a conserved element in its own pre-mRNA to drive AS-NMD answered how ribosomal protein levels are homeostatically controlled by the protein itself.","evidence":"NMD-mutant transcriptome analysis in C. elegans, direct RNA-binding assay to L10ARE, splice reporter assays, conservation in vertebrates","pmids":["26961311"],"confidence":"High","gaps":["Structural basis of L10a-L10ARE recognition not resolved","Whether autoregulation is coupled to ribosome assembly state unknown"]},{"year":2019,"claim":"Loss-of-function in zebrafish established that rpl10a is required for embryonic development across multiple lineages, linking its depletion to p53-dependent apoptosis.","evidence":"Morpholino knockdown and CRISPR knockout with mRNA rescue, gene expression analysis of erythroid and germ-cell markers","pmids":["31792295"],"confidence":"Medium","gaps":["Cannot separate general ribosomal stress from specialized translation roles","Mechanism linking loss to tp53 induction not defined"]},{"year":2020,"claim":"Showing that excess NMD-susceptible rpl10a transcript impairs T cell development demonstrated that dysregulated autoregulation has tissue-specific, immune-system consequences downstream of NMD.","evidence":"Zebrafish upf1 mutant analysis, RNA-seq, injection of NMD-susceptible rpl10a transcript with T cell readout","pmids":["32571908"],"confidence":"Medium","gaps":["Whether the effect is through altered RPL10A protein dose or a transcript-intrinsic activity is unresolved","Single-lab finding"]},{"year":2022,"claim":"Demonstrating that RPL10A-containing ribosomes preferentially translate Wnt and mesoderm mRNAs established a specialized translation function controlling cell fate during embryogenesis.","evidence":"Quantitative MS during hESC differentiation, mouse Rpl10a loss-of-function, ribosome profiling, ribosome IP for mRNA enrichment","pmids":["36123354"],"confidence":"High","gaps":["Molecular basis for mRNA selectivity by RPL10A-containing ribosomes unknown","Whether selectivity arises from ribosome heterogeneity vs extraribosomal activity not distinguished"]},{"year":2025,"claim":"Identification of dedicated chaperones for Rpl1/RPL10A addressed how this protein is safely delivered to the nucleus and loaded onto pre-60S particles.","evidence":"Yeast Acl1-Rpl1 crystal structure, in vitro trimeric complex reconstitution, mutational and growth analysis; human WDR89 from TurboID proxiOME (preprint)","pmids":["bio_10.1101_2025.09.18.677003"],"confidence":"Medium","gaps":["Human WDR89 connection is proximity labeling only, not reconstituted","Preprint, not peer-reviewed"]},{"year":null,"claim":"It remains unknown how RPL10A confers mRNA selectivity at the ribosome and how its autoregulatory RNA-binding, assembly chaperoning, and specialized-translation functions are mechanistically integrated.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of how RPL10A biases mRNA translation","Relationship between AS-NMD autoregulation and ribosome specialization untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[0,7]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0]}],"complexes":["60S large ribosomal subunit","Acl1-Bcl1-Rpl1 chaperone complex (yeast)"],"partners":["WDR89","ACL1","BCL1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62906","full_name":"Large ribosomal subunit protein uL1","aliases":["60S ribosomal protein L10a","CSA-19","Neural precursor cell expressed developmentally down-regulated protein 6","NEDD-6"],"length_aa":217,"mass_kda":24.8,"function":"Component of the large ribosomal subunit (PubMed:12962325, PubMed:23636399, PubMed:32669547). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:12962325, PubMed:23636399, PubMed:32669547)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P62906/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RPL10A","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000198755","cell_line_id":"CID000863","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleolus_gc","grade":2}],"interactors":[{"gene":"CAPRIN1","stoichiometry":10.0},{"gene":"EIF2S3","stoichiometry":10.0},{"gene":"RACK1","stoichiometry":10.0},{"gene":"RBM8A","stoichiometry":10.0},{"gene":"RPS8","stoichiometry":10.0},{"gene":"RPL15","stoichiometry":10.0},{"gene":"RPL11","stoichiometry":10.0},{"gene":"RPL4","stoichiometry":10.0},{"gene":"RPL5","stoichiometry":10.0},{"gene":"RPS16","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000863","total_profiled":1310},"omim":[{"mim_id":"615660","title":"RIBOSOMAL PROTEIN L10A; RPL10A","url":"https://www.omim.org/entry/615660"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli","reliability":"Supported"},{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPL10A"},"hgnc":{"alias_symbol":["Csa-19","L10A","uL1"],"prev_symbol":["NEDD6"]},"alphafold":{"accession":"P62906","domains":[{"cath_id":"3.30.190.20","chopping":"6-49_159-214","consensus_level":"high","plddt":83.5662,"start":6,"end":214},{"cath_id":"3.40.50.790","chopping":"64-151","consensus_level":"high","plddt":76.1278,"start":64,"end":151}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P62906","model_url":"https://alphafold.ebi.ac.uk/files/AF-P62906-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P62906-F1-predicted_aligned_error_v6.png","plddt_mean":79.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPL10A","jax_strain_url":"https://www.jax.org/strain/search?query=RPL10A"},"sequence":{"accession":"P62906","fasta_url":"https://rest.uniprot.org/uniprotkb/P62906.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P62906/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P62906"}},"corpus_meta":[{"pmid":"19112492","id":"PMC_19112492","title":"Regulated 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Glycosaminoglycans","date":"2025-10-02","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.30.679577","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17668,"output_tokens":2455,"usd":0.044915,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9612,"output_tokens":2717,"usd":0.057993,"stage2_stop_reason":"end_turn"},"total_usd":0.102908,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"RPL10A/uL1-containing ribosomes are upregulated in the primitive streak during human embryonic stem cell differentiation and are enriched on Wnt pathway mRNAs; Rpl10a loss-of-function in mice causes posterior trunk truncations and inhibits paraxial mesoderm production, with ribosome profiling showing decreased translation of mesoderm regulators including Wnt pathway mRNAs; RPL10A/uL1 regulates canonical and non-canonical Wnt signaling during differentiation.\",\n      \"method\": \"Quantitative mass spectrometry during hESC differentiation, Rpl10a loss-of-function mouse genetics, ribosome profiling, ribosome immunoprecipitation to identify mRNA enrichment, stem cell differentiation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (proteomics, ribosome profiling, genetic loss-of-function in mouse and culture) converging on same mechanistic conclusion in a single rigorous study\",\n      \"pmids\": [\"36123354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RPL10A (L10a/RPL-1 in C. elegans) directly and specifically binds an evolutionarily conserved 39-nt RNA element (L10ARE) located between two alternative 5' splice sites in its own pre-mRNA, switching splice site choice to generate an NMD-susceptible transcript, thereby autoregulating its own expression level; this AS-NMD autoregulation is conserved in vertebrates.\",\n      \"method\": \"Transcriptome analysis of NMD-defective C. elegans mutants, RNA-binding assay (L10a binding to L10ARE), splice-site reporter assays, RNAi knockdown of rp genes with splicing readout\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct RNA-binding assay with defined element, functional splicing readout, conservation validated in vertebrates, multiple orthogonal methods\",\n      \"pmids\": [\"26961311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Artificially increased levels of NMD-susceptible rpl10a transcripts in zebrafish larvae significantly impaired T cell development, identifying an extraribosomal tissue-specific function for rpl10a in the immune system; this effect is mediated through dysregulated autoregulation of rpl10a splicing downstream of upf1/NMD pathway.\",\n      \"method\": \"Zebrafish upf1 mutant analysis, RNA-seq for differentially expressed genes, injection of NMD-susceptible rpl10a transcripts into zebrafish larvae with T cell development readout\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean in vivo gain-of-function experiment with specific developmental phenotype, single lab, two complementary approaches (mutant analysis + transcript injection)\",\n      \"pmids\": [\"32571908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of rpl10a function in zebrafish (morpholino knockdown and CRISPR-Cas9 5-bp deletion knockout) causes embryonic developmental defects including reduced expression of erythroid synthesis genes (gata1, hbae3, hbbe1), increased tp53 expression, reduced primordial germ cell marker gene expression (nanos1, vasa), and apoptosis; morphant phenotype was rescued by rpl10a mRNA co-injection.\",\n      \"method\": \"Morpholino antisense oligonucleotide knockdown, CRISPR-Cas9 knockout generating homozygous deletion, mRNA rescue experiment, gene expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent loss-of-function approaches (morpholino + CRISPR) with mRNA rescue, single lab\",\n      \"pmids\": [\"31792295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ribosomal protein L10a physically interacts with trichosanthin (a type I ribosome-inactivating protein); the interaction was identified by Sepharose affinity purification and confirmed by in vitro binding assay; surface plasmon resonance kinetics revealed a Kd of 7.78 nM; the interaction correlates with the ribosome-inactivating activity of trichosanthin, suggesting L10a is involved in the mechanism by which trichosanthin inactivates ribosomes.\",\n      \"method\": \"Trichosanthin-coupled Sepharose affinity purification, mass spectrometry identification, in vitro binding assay, surface plasmon resonance (SPR) kinetics, mutagenesis of trichosanthin\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding reconstituted and quantified by SPR, mutagenesis correlation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16126173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The human ortholog WDR89 was found in the proxiOME of human RPL10A (the human Rpl1/uL1 ortholog) by TurboID-based proximity labeling, suggesting an evolutionarily conserved chaperone function analogous to yeast Bcl1 for Rpl1; in yeast, the dedicated chaperones Acl1 and Bcl1 directly interact with Rpl1, form a trimeric complex in vitro, and cooperate to ensure nuclear transfer and efficient loading of Rpl1 onto pre-60S subunits.\",\n      \"method\": \"TurboID-based proximity labeling in human cells, crystal structure of Acl1-Rpl1 complex (yeast), in vitro reconstitution of trimeric complex, mutational analysis, growth assays in yeast double mutants\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — crystal structure and in vitro reconstitution for yeast orthologs with mutational validation; human RPL10A connection is proximity labeling only (Tier 3); preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.09.18.677003\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In Arabidopsis (plant ortholog rpL10A), NIK1 kinase phosphorylates cytosolic rpL10A, which redirects it to the nucleus as part of an antiviral defense response; hyperactive NIK1 promotes nuclear accumulation of phosphorylated rpL10A, kinase-inactive NIK1 fails to do so, and a phosphorylation-defective rpL10A mutant is not redirected to the nucleus; loss of rpL10A function enhances susceptibility to geminivirus infection.\",\n      \"method\": \"Kinase-substrate assay (NIK1 phosphorylation of rpL10A), co-transfection with nuclear localization readout, NIK1 mutant analysis, phosphorylation-defective rpL10A mutant, virus infection susceptibility assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple complementary experiments in plant (non-mammalian, non-ortholog model); while mechanistically detailed, this describes a plant-specific signaling context not conserved in the mammalian gene's known function\",\n      \"pmids\": [\"19112492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The primary structure of rat ribosomal protein L10a was determined: 217 amino acids, molecular weight 24,815 Da, encoded by a gene present in 7-10 copies in nuclear DNA, with an mRNA of approximately 760 nucleotides; the protein is homologous to eukaryotic and archaebacterial ribosomal proteins.\",\n      \"method\": \"cDNA sequencing, Southern blot hybridization for gene copy number, Northern blot for mRNA size\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct primary structure determination from cDNA, multiple complementary molecular characterization methods, single lab\",\n      \"pmids\": [\"8607874\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPL10A (uL1) is a 60S large ribosomal subunit protein that autoregulates its own expression by directly binding a conserved RNA element in its own pre-mRNA to shift alternative splicing toward an NMD-degraded isoform; RPL10A-containing ribosomes preferentially translate Wnt pathway and mesoderm-specification mRNAs, establishing a specialized translation function that controls cell fate during embryonic development; loss of RPL10A impairs mesoderm production and T cell development in vivo, and dedicated chaperones (WDR89 in humans, Bcl1/Acl1 in yeast) interact with RPL10A/Rpl1 to ensure its safe nuclear delivery and incorporation into pre-60S ribosomal particles.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPL10A (uL1) is a 60S large ribosomal subunit protein that functions both as a core component of the translation machinery and as a specificity factor that biases ribosomes toward distinct mRNA pools during development [#0, #7]. RPL10A-containing ribosomes are enriched on Wnt pathway mRNAs and are upregulated in the primitive streak during embryonic stem cell differentiation; loss of Rpl10a in mice impairs paraxial mesoderm production and reduces translation of mesoderm regulators, establishing RPL10A as a control point for cell-fate decisions through specialized translation [#0]. RPL10A autoregulates its own abundance by directly binding a conserved 39-nt element (L10ARE) positioned between alternative 5' splice sites in its own pre-mRNA, switching splice-site choice to generate an NMD-susceptible transcript, a feedback loop conserved from C. elegans to vertebrates [#1]. Disruption of this autoregulation has tissue-specific consequences: excess NMD-susceptible rpl10a transcript impairs T cell development in zebrafish, and loss of rpl10a function causes broad embryonic defects including reduced erythroid and germ-cell gene expression, p53 induction, and apoptosis [#2, #3]. Nuclear delivery and pre-60S loading of RPL10A/Rpl1 are managed by dedicated chaperones \\u2014 yeast Acl1 and Bcl1 form a trimeric complex with Rpl1, and the human ortholog WDR89 appears in the RPL10A proximity interactome [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the primary structure and gene organization of L10a was the foundational step defining the protein as a conserved eukaryotic/archaebacterial ribosomal protein.\",\n      \"evidence\": \"cDNA sequencing, Southern and Northern blot characterization in rat\",\n      \"pmids\": [\"8607874\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional role assigned beyond sequence homology\", \"No localization or interaction data\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying a high-affinity physical interaction between L10a and the ribosome-inactivating protein trichosanthin connected L10a to the mechanism by which a toxin inactivates ribosomes.\",\n      \"evidence\": \"Affinity purification, in vitro binding, SPR kinetics (Kd 7.78 nM), trichosanthin mutagenesis\",\n      \"pmids\": [\"16126173\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of binding for normal ribosome function not addressed\", \"Binding interface on L10a not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that L10a binds a conserved element in its own pre-mRNA to drive AS-NMD answered how ribosomal protein levels are homeostatically controlled by the protein itself.\",\n      \"evidence\": \"NMD-mutant transcriptome analysis in C. elegans, direct RNA-binding assay to L10ARE, splice reporter assays, conservation in vertebrates\",\n      \"pmids\": [\"26961311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of L10a-L10ARE recognition not resolved\", \"Whether autoregulation is coupled to ribosome assembly state unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Loss-of-function in zebrafish established that rpl10a is required for embryonic development across multiple lineages, linking its depletion to p53-dependent apoptosis.\",\n      \"evidence\": \"Morpholino knockdown and CRISPR knockout with mRNA rescue, gene expression analysis of erythroid and germ-cell markers\",\n      \"pmids\": [\"31792295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cannot separate general ribosomal stress from specialized translation roles\", \"Mechanism linking loss to tp53 induction not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showing that excess NMD-susceptible rpl10a transcript impairs T cell development demonstrated that dysregulated autoregulation has tissue-specific, immune-system consequences downstream of NMD.\",\n      \"evidence\": \"Zebrafish upf1 mutant analysis, RNA-seq, injection of NMD-susceptible rpl10a transcript with T cell readout\",\n      \"pmids\": [\"32571908\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the effect is through altered RPL10A protein dose or a transcript-intrinsic activity is unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that RPL10A-containing ribosomes preferentially translate Wnt and mesoderm mRNAs established a specialized translation function controlling cell fate during embryogenesis.\",\n      \"evidence\": \"Quantitative MS during hESC differentiation, mouse Rpl10a loss-of-function, ribosome profiling, ribosome IP for mRNA enrichment\",\n      \"pmids\": [\"36123354\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for mRNA selectivity by RPL10A-containing ribosomes unknown\", \"Whether selectivity arises from ribosome heterogeneity vs extraribosomal activity not distinguished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of dedicated chaperones for Rpl1/RPL10A addressed how this protein is safely delivered to the nucleus and loaded onto pre-60S particles.\",\n      \"evidence\": \"Yeast Acl1-Rpl1 crystal structure, in vitro trimeric complex reconstitution, mutational and growth analysis; human WDR89 from TurboID proxiOME (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.09.18.677003\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Human WDR89 connection is proximity labeling only, not reconstituted\", \"Preprint, not peer-reviewed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how RPL10A confers mRNA selectivity at the ribosome and how its autoregulatory RNA-binding, assembly chaperoning, and specialized-translation functions are mechanistically integrated.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of how RPL10A biases mRNA translation\", \"Relationship between AS-NMD autoregulation and ribosome specialization untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\n      \"60S large ribosomal subunit\",\n      \"Acl1-Bcl1-Rpl1 chaperone complex (yeast)\"\n    ],\n    \"partners\": [\n      \"WDR89\",\n      \"ACL1\",\n      \"BCL1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}