{"gene":"RPS27L","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":2006,"finding":"RPS27L is a direct transcriptional target of p53; a consensus p53-binding site in the first intron of RPS27L was identified, and direct p53 binding was demonstrated both in vitro (EMSA) and in vivo (ChIP). Overexpression of RPS27L promoted apoptosis induced by etoposide, while siRNA silencing of RPS27L inhibited it.","method":"Genome-wide chip profiling, EMSA, ChIP, luciferase reporter assay, siRNA knockdown, apoptosis assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (EMSA, ChIP, reporter assay, functional KD) in a single study, replicated in multiple cancer cell models","pmids":["17057733"],"is_preprint":false},{"year":2007,"finding":"RPS27L is a nuclear protein that forms nuclear foci upon DNA damage. Depletion of RPS27L causes deficiency in DNA damage checkpoints, converting p53-mediated cell cycle arrest to apoptosis. RPS27L positively regulates p21 protein expression to facilitate cell cycle arrest.","method":"siRNA knockdown, immunofluorescence/nuclear foci imaging, cell cycle analysis, flow cytometry, western blot for p21","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization, KD with defined checkpoint phenotype, p21 regulation) in a single study","pmids":["18056458"],"is_preprint":false},{"year":2010,"finding":"The N-terminal region of RPS27L (and RPS27) binds to the central acidic domain of MDM2, forming an in vivo triplex with MDM2-p53 and competing with p53 for MDM2 binding. RPS27L (but not RPS27) is a short-lived MDM2 substrate whose degradation requires the RING or acidic domain of MDM2. Ectopic RPS27L inhibits MDM2-mediated p53 ubiquitination and extends p53 half-life; siRNA silencing of RPS27L decreases p53 levels. Upon p53-activating signals, RPS27L (mainly cytoplasmic) shuttles to the nucleoplasm where it colocalizes with MDM2.","method":"Co-immunoprecipitation, domain mapping, in vivo ubiquitination assay, pulse-chase half-life assay, siRNA knockdown, immunofluorescence/colocalization, luciferase reporter for p53 transcriptional activity","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (Co-IP with domain mapping, ubiquitination assay, half-life assay, localization), strong mechanistic detail","pmids":["21170087"],"is_preprint":false},{"year":2014,"finding":"In a mouse knockout model, Rps27l disruption triggers ribosomal stress that stabilizes Mdm2, which then degrades Mdm4, reducing the Mdm2-Mdm4 E3 ligase activity toward p53, leading to p53-dependent apoptotic depletion of hematopoietic stem cells and postnatal death rescued by Trp53 deletion. Under Trp53+/- background, Rps27l disruption drives genomic instability and loss of heterozygosity of Trp53 to promote lymphomagenesis.","method":"Mouse germline knockout, genetic epistasis (Rps27l-/-;Trp53-/- double mutant rescue), western blot for Mdm2/Mdm4/p53, flow cytometry of hematopoietic stem cells, tumor incidence analysis, karyotyping","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo genetic epistasis with mechanistic pathway dissection (Mdm2-Mdm4-p53 axis), multiple orthogonal methods","pmids":["25144937"],"is_preprint":false},{"year":2018,"finding":"RPS27L silencing induces autophagy by inactivating mTORC1 (but not mTORC2). Mechanistically, RPS27L silencing shortens the protein half-life of β-TrCP (a substrate receptor of SCF ubiquitin ligase responsible for DEPTOR degradation), leading to DEPTOR accumulation that inhibits mTORC1. Simultaneous DEPTOR silencing partially rescues autophagy and mTORC1 inactivation caused by RPS27L loss.","method":"siRNA knockdown, autophagy assays (LC3-II, autophagic flux), mTORC1/mTORC2 activity assays, pulse-chase half-life assay for β-TrCP, DEPTOR western blot, double knockdown epistasis, Rps27l-/- MEFs","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD, MEF KO, double KD epistasis, half-life assay) establishing β-TrCP-DEPTOR-mTORC1 pathway","pmids":["30425236"],"is_preprint":false},{"year":2018,"finding":"Rps27l inactivation confers radiosensitivity via two mechanisms: (1) imbalanced Mdm2/Mdm4 levels leading to activated p53; (2) elevated Mdm2 binding to Nbs1, which inhibits Nbs1-Atm interaction and subsequent Atm activation, reducing the MRN/Atm DNA damage response signal. Heterozygous deletion of Mdm2 restores the MRN/Atm signal.","method":"Mouse knockout (Rps27l-/-;Trp53+/-), radiation sensitivity assay, Co-immunoprecipitation (Mdm2-Nbs1 binding), western blot for MRN/Atm pathway, genetic rescue by Mdm2 heterozygous deletion","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model plus Co-IP and epistasis demonstrating two distinct signaling axes","pmids":["29396424"],"is_preprint":false},{"year":2020,"finding":"RPS27L directly binds to FANCD2 and FANCI (Fanconi anemia proteins). Upon RPS27L knockdown, FANCD2 and FANCI protein levels are reduced due to accelerated degradation via p62-mediated autophagy-lysosome pathway, which impairs ICL repair and reduces FANCD2 foci formation upon mitomycin C treatment.","method":"Co-immunoprecipitation (RPS27L-FANCD2/FANCI), siRNA knockdown, immunofluorescence (FANCD2 foci), chloroquine/Beclin1 rescue experiments, MMC sensitivity assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP establishing physical interaction, combined with functional rescue experiments and defined phenotypic readout","pmids":["33051438"],"is_preprint":false},{"year":2020,"finding":"Both RPS27L and RPS27 are substrates of neddylation by MDM2 E3 ubiquitin ligase and deneddylation by NEDP1. Blockage of neddylation (with MLN4924) destabilizes RPS27L and RPS27 by shortening their protein half-lives. Neddylation stabilizes RPS27L to confer cancer cell survival.","method":"In vivo neddylation assay, siRNA knockdown of MDM2/NEDP1, MLN4924 treatment, pulse-chase half-life assay, apoptosis assay upon knockdown/overexpression","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1-2 — identification of neddylation writer (MDM2) and eraser (NEDP1) with functional half-life and survival readouts","pmids":["32779270"],"is_preprint":false},{"year":2023,"finding":"Rps27 and Rps27l have inversely correlated mRNA abundance across mouse cell types. Rps27- and Rps27l-ribosomes associate preferentially with different mRNA transcripts. Loss-of-function alleles are homozygous lethal at different developmental stages, but expressing Rps27 protein from the endogenous Rps27l locus (or vice versa) completely rescues lethality, demonstrating the two proteins are functionally equivalent and their retention is driven by subfunctionalized expression patterns.","method":"Endogenous protein tagging, ribosome-associated mRNA profiling, mouse knockout and knock-in genetic rescue, developmental lethality staging","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo genetic rescue with endogenous tagging and ribosome-mRNA association profiling; multiple orthogonal methods","pmids":["37306301"],"is_preprint":false},{"year":2025,"finding":"Muscle-specific Rps27l knock-in mice exhibit increased muscle mass, enlarged myofiber size, higher proportion of fast-twitch myofibers, and enhanced muscle regeneration. RPS27L overexpression promotes myoblast proliferation while inhibiting differentiation. The N-terminal intrinsically disordered region of RPS27L facilitates liquid-liquid phase separation (LLPS) and interacts with IGF1 mRNA/protein to regulate myogenesis. SIX4 (a myogenic transcription factor) negatively regulates Rps27l expression.","method":"Muscle-specific knock-in mouse model, myofiber size/composition analysis, myoblast overexpression/KD, LLPS assay, RNA-binding/IGF1 interaction assay, SIX4 transcription factor binding assay","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KI model with defined phenotype plus LLPS and IGF1 interaction assays, single lab","pmids":["40886325"],"is_preprint":false},{"year":2020,"finding":"RPS27L is identified as a direct transcriptional target of p53 lacking the 1st transactivation domain (Δ1stTAD-p53), dependent on the 2nd TAD transcriptional activation activity, confirming RPS27L induction requires at least the 2nd TAD of p53.","method":"ChIP-seq, luciferase reporter assay, p53 mutant transactivation analysis","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq with reporter validation, single lab, extends prior p53 target finding with domain specificity","pmids":["31834974"],"is_preprint":false}],"current_model":"RPS27L is a direct p53 transcriptional target and MDM2 substrate whose N-terminal region binds the MDM2 acidic domain to compete with p53, inhibit MDM2-mediated p53 ubiquitination, and extend p53 half-life; upon ribosomal stress caused by RPS27L loss, stabilized MDM2 degrades MDM4, reducing E3 ligase activity toward p53 and activating p53-dependent apoptosis, while also binding Nbs1 to suppress ATM activation and DNA damage signaling; RPS27L is additionally neddylated by MDM2 and deneddylated by NEDP1 for its stability, promotes DNA interstrand cross-link repair by binding and protecting FANCD2/FANCI from autophagy-lysosomal degradation, regulates autophagy via the β-TrCP–DEPTOR–mTORC1 axis, and in skeletal muscle undergoes liquid-liquid phase separation through its N-terminal disordered region to interact with IGF1 and promote muscle growth."},"narrative":{"teleology":[{"year":2006,"claim":"Establishing that RPS27L is a direct p53 transcriptional target answered the question of how this ribosomal protein gene is regulated in response to genotoxic stress and linked it to apoptotic signaling.","evidence":"Genome-wide chip profiling, EMSA, ChIP, reporter assays, and siRNA in cancer cell lines","pmids":["17057733"],"confidence":"High","gaps":["Mechanism by which RPS27L promotes etoposide-induced apoptosis was undefined","Which p53 transactivation domain drives RPS27L induction was unknown"]},{"year":2007,"claim":"Demonstrating that RPS27L forms nuclear foci after DNA damage and that its loss converts p53-mediated arrest to apoptosis revealed a checkpoint-maintenance function and a role in sustaining p21 expression.","evidence":"siRNA knockdown, immunofluorescence, cell cycle/flow cytometry, and western blot in human cancer cells","pmids":["18056458"],"confidence":"High","gaps":["Molecular mechanism connecting RPS27L to p21 protein stability was not determined","Whether nuclear foci represent ribosomal or extra-ribosomal functions was unclear"]},{"year":2010,"claim":"Mapping the RPS27L–MDM2 interaction to the MDM2 acidic domain and showing competitive inhibition of p53 ubiquitination provided a direct molecular mechanism for RPS27L-mediated p53 stabilization.","evidence":"Co-immunoprecipitation with domain mapping, in vivo ubiquitination assay, pulse-chase half-life, immunofluorescence colocalization","pmids":["21170087"],"confidence":"High","gaps":["Structural basis of the RPS27L–MDM2 interaction was not resolved","Physiological significance of MDM2-mediated RPS27L degradation in vivo was untested"]},{"year":2014,"claim":"An Rps27l knockout mouse demonstrated that loss of RPS27L triggers ribosomal stress–induced MDM2 stabilization, MDM4 degradation, and p53-dependent hematopoietic stem cell apoptosis, establishing the in vivo relevance of the MDM2–MDM4–p53 regulatory axis.","evidence":"Germline mouse knockout with Trp53 genetic epistasis, western blot, flow cytometry, karyotyping, tumor incidence analysis","pmids":["25144937"],"confidence":"High","gaps":["Whether ribosomal stress from RPS27L loss reflects impaired ribosome assembly or a free ribosomal protein signal was not distinguished","Contribution of non-p53 pathways to postnatal lethality was not assessed"]},{"year":2018,"claim":"Two studies expanded the consequences of RPS27L loss beyond p53: one showed Rps27l-/- radiosensitivity arises partly through MDM2-mediated Nbs1 sequestration that suppresses ATM activation, while the other revealed RPS27L silencing induces autophagy via β-TrCP destabilization, DEPTOR accumulation, and mTORC1 inactivation.","evidence":"Mouse knockout radiation assays with Mdm2 heterozygous rescue and Co-IP (Mdm2–Nbs1); siRNA double knockdown epistasis, autophagy flux, pulse-chase for β-TrCP in human cells and Rps27l-/- MEFs","pmids":["29396424","30425236"],"confidence":"High","gaps":["Whether the MDM2–Nbs1 interaction is direct or part of a larger complex was not clarified","How RPS27L controls β-TrCP protein stability mechanistically remains undefined"]},{"year":2020,"claim":"Three discoveries refined RPS27L's molecular network: it directly binds and protects FANCD2/FANCI from autophagic degradation to promote ICL repair; it is stabilized by MDM2-mediated neddylation reversed by NEDP1; and its p53-dependent induction requires at least the 2nd transactivation domain of p53.","evidence":"Reciprocal Co-IP for FANCD2/FANCI with autophagy rescue; in vivo neddylation assay with MDM2/NEDP1 manipulation and half-life assays; ChIP-seq with p53 TAD mutant analysis","pmids":["33051438","32779270","31834974"],"confidence":"High","gaps":["Whether neddylation and ubiquitination by MDM2 are competitive modifications on the same sites was not determined","Structural basis for RPS27L recognition of FANCD2/FANCI is unknown","Relative contributions of neddylation versus ubiquitination to RPS27L steady-state levels in vivo remain unresolved"]},{"year":2023,"claim":"Demonstrating that RPS27L and RPS27 are functionally interchangeable ribosomal proteins retained by subfunctionalized expression answered a long-standing question about paralog divergence versus redundancy.","evidence":"Endogenous tagging, ribosome-mRNA profiling, mouse knockout and reciprocal knock-in rescue, developmental staging","pmids":["37306301"],"confidence":"High","gaps":["Whether the extra-ribosomal functions of RPS27L (MDM2 binding, FANCD2 protection) are shared with RPS27 was not tested","Cell-type-specific requirements for RPS27L versus RPS27 beyond developmental lethality are unexplored"]},{"year":2025,"claim":"Identification of RPS27L-driven liquid–liquid phase separation via its N-terminal disordered region and interaction with IGF1 in skeletal muscle established a tissue-specific extra-ribosomal function in myogenesis and muscle growth.","evidence":"Muscle-specific knock-in mouse, LLPS assays, IGF1 RNA/protein interaction, SIX4 transcription factor binding analysis","pmids":["40886325"],"confidence":"Medium","gaps":["LLPS formation has been demonstrated in one study and awaits independent confirmation","Whether phase separation is required for the IGF1 interaction or merely correlates with it is unclear","Relevance of LLPS to non-muscle cell types is unknown"]},{"year":null,"claim":"Key open questions include: whether RPS27L's extra-ribosomal functions (MDM2 regulation, FANCD2 protection, LLPS) operate from a free cytoplasmic pool or from assembled ribosomes; the structural basis for RPS27L–MDM2 and RPS27L–FANCD2 interactions; and whether the distinct extra-ribosomal activities are functionally coordinated or independent.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of RPS27L in complex with any partner","Ribosome-associated versus free-protein pools have not been quantified","Integration of neddylation, autophagy, and DNA repair functions into a unified regulatory model is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,3]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[9]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[8]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,5]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1]}],"complexes":["40S ribosomal subunit"],"partners":["MDM2","MDM4","FANCD2","FANCI","NEDP1","NBN","IGF1","BTRC"],"other_free_text":[]},"mechanistic_narrative":"RPS27L is a ribosomal protein and direct p53 transcriptional target that functions as a key node linking ribosomal stress sensing to p53 pathway regulation, DNA damage repair, and autophagy. Its N-terminal region binds the MDM2 acidic domain, competitively inhibiting MDM2-mediated p53 ubiquitination and extending p53 half-life; upon RPS27L loss, ribosomal stress stabilizes MDM2, which degrades MDM4 to reduce MDM2–MDM4 E3 ligase activity and activate p53-dependent apoptosis, while elevated MDM2 also sequesters Nbs1 to suppress ATM signaling [PMID:21170087, PMID:25144937, PMID:29396424]. RPS27L additionally promotes DNA interstrand cross-link repair by binding and protecting FANCD2/FANCI from p62-mediated autophagic degradation, regulates autophagy through the β-TrCP–DEPTOR–mTORC1 axis, and is itself stabilized by MDM2-mediated neddylation reversed by NEDP1 [PMID:33051438, PMID:30425236, PMID:32779270]. Although RPS27L and its paralog RPS27 are functionally interchangeable as ribosomal proteins—with knock-in of one fully rescuing lethality of the other—they are retained in the genome through subfunctionalized, inversely correlated expression patterns across cell types, and RPS27L uniquely undergoes liquid–liquid phase separation via its N-terminal disordered region to interact with IGF1 and promote skeletal muscle growth [PMID:37306301, PMID:40886325]."},"prefetch_data":{"uniprot":{"accession":"Q71UM5","full_name":"Ribosomal protein eS27-like","aliases":["40S ribosomal protein S27-like","Small ribosomal subunit protein eS27-like"],"length_aa":84,"mass_kda":9.5,"function":"","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q71UM5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RPS27L","classification":"Not Classified","n_dependent_lines":20,"n_total_lines":1208,"dependency_fraction":0.016556291390728478},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RACK1","stoichiometry":10.0},{"gene":"RPL11","stoichiometry":10.0},{"gene":"RPL5","stoichiometry":10.0},{"gene":"RPS16","stoichiometry":10.0},{"gene":"SRP72","stoichiometry":10.0},{"gene":"DRG1","stoichiometry":4.0},{"gene":"EIF2S3","stoichiometry":4.0},{"gene":"EIF3B","stoichiometry":4.0},{"gene":"RBM8A","stoichiometry":4.0},{"gene":"RPL19","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/search/RPS27L","total_profiled":1310},"omim":[{"mim_id":"612055","title":"RIBOSOMAL PROTEIN S27-LIKE; RPS27L","url":"https://www.omim.org/entry/612055"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPS27L"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q71UM5","domains":[{"cath_id":"2.20.25.100","chopping":"29-80","consensus_level":"high","plddt":94.7173,"start":29,"end":80}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q71UM5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q71UM5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q71UM5-F1-predicted_aligned_error_v6.png","plddt_mean":92.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPS27L","jax_strain_url":"https://www.jax.org/strain/search?query=RPS27L"},"sequence":{"accession":"Q71UM5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q71UM5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q71UM5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q71UM5"}},"corpus_meta":[{"pmid":"21170087","id":"PMC_21170087","title":"Ribosomal protein S27-like and S27 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first intron of RPS27L was identified, and direct p53 binding was demonstrated both in vitro (EMSA) and in vivo (ChIP). Overexpression of RPS27L promoted apoptosis induced by etoposide, while siRNA silencing of RPS27L inhibited it.\",\n      \"method\": \"Genome-wide chip profiling, EMSA, ChIP, luciferase reporter assay, siRNA knockdown, apoptosis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (EMSA, ChIP, reporter assay, functional KD) in a single study, replicated in multiple cancer cell models\",\n      \"pmids\": [\"17057733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RPS27L is a nuclear protein that forms nuclear foci upon DNA damage. Depletion of RPS27L causes deficiency in DNA damage checkpoints, converting p53-mediated cell cycle arrest to apoptosis. RPS27L positively regulates p21 protein expression to facilitate cell cycle arrest.\",\n      \"method\": \"siRNA knockdown, immunofluorescence/nuclear foci imaging, cell cycle analysis, flow cytometry, western blot for p21\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, KD with defined checkpoint phenotype, p21 regulation) in a single study\",\n      \"pmids\": [\"18056458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The N-terminal region of RPS27L (and RPS27) binds to the central acidic domain of MDM2, forming an in vivo triplex with MDM2-p53 and competing with p53 for MDM2 binding. RPS27L (but not RPS27) is a short-lived MDM2 substrate whose degradation requires the RING or acidic domain of MDM2. Ectopic RPS27L inhibits MDM2-mediated p53 ubiquitination and extends p53 half-life; siRNA silencing of RPS27L decreases p53 levels. Upon p53-activating signals, RPS27L (mainly cytoplasmic) shuttles to the nucleoplasm where it colocalizes with MDM2.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, in vivo ubiquitination assay, pulse-chase half-life assay, siRNA knockdown, immunofluorescence/colocalization, luciferase reporter for p53 transcriptional activity\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (Co-IP with domain mapping, ubiquitination assay, half-life assay, localization), strong mechanistic detail\",\n      \"pmids\": [\"21170087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In a mouse knockout model, Rps27l disruption triggers ribosomal stress that stabilizes Mdm2, which then degrades Mdm4, reducing the Mdm2-Mdm4 E3 ligase activity toward p53, leading to p53-dependent apoptotic depletion of hematopoietic stem cells and postnatal death rescued by Trp53 deletion. Under Trp53+/- background, Rps27l disruption drives genomic instability and loss of heterozygosity of Trp53 to promote lymphomagenesis.\",\n      \"method\": \"Mouse germline knockout, genetic epistasis (Rps27l-/-;Trp53-/- double mutant rescue), western blot for Mdm2/Mdm4/p53, flow cytometry of hematopoietic stem cells, tumor incidence analysis, karyotyping\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo genetic epistasis with mechanistic pathway dissection (Mdm2-Mdm4-p53 axis), multiple orthogonal methods\",\n      \"pmids\": [\"25144937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RPS27L silencing induces autophagy by inactivating mTORC1 (but not mTORC2). Mechanistically, RPS27L silencing shortens the protein half-life of β-TrCP (a substrate receptor of SCF ubiquitin ligase responsible for DEPTOR degradation), leading to DEPTOR accumulation that inhibits mTORC1. Simultaneous DEPTOR silencing partially rescues autophagy and mTORC1 inactivation caused by RPS27L loss.\",\n      \"method\": \"siRNA knockdown, autophagy assays (LC3-II, autophagic flux), mTORC1/mTORC2 activity assays, pulse-chase half-life assay for β-TrCP, DEPTOR western blot, double knockdown epistasis, Rps27l-/- MEFs\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD, MEF KO, double KD epistasis, half-life assay) establishing β-TrCP-DEPTOR-mTORC1 pathway\",\n      \"pmids\": [\"30425236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rps27l inactivation confers radiosensitivity via two mechanisms: (1) imbalanced Mdm2/Mdm4 levels leading to activated p53; (2) elevated Mdm2 binding to Nbs1, which inhibits Nbs1-Atm interaction and subsequent Atm activation, reducing the MRN/Atm DNA damage response signal. Heterozygous deletion of Mdm2 restores the MRN/Atm signal.\",\n      \"method\": \"Mouse knockout (Rps27l-/-;Trp53+/-), radiation sensitivity assay, Co-immunoprecipitation (Mdm2-Nbs1 binding), western blot for MRN/Atm pathway, genetic rescue by Mdm2 heterozygous deletion\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model plus Co-IP and epistasis demonstrating two distinct signaling axes\",\n      \"pmids\": [\"29396424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RPS27L directly binds to FANCD2 and FANCI (Fanconi anemia proteins). Upon RPS27L knockdown, FANCD2 and FANCI protein levels are reduced due to accelerated degradation via p62-mediated autophagy-lysosome pathway, which impairs ICL repair and reduces FANCD2 foci formation upon mitomycin C treatment.\",\n      \"method\": \"Co-immunoprecipitation (RPS27L-FANCD2/FANCI), siRNA knockdown, immunofluorescence (FANCD2 foci), chloroquine/Beclin1 rescue experiments, MMC sensitivity assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP establishing physical interaction, combined with functional rescue experiments and defined phenotypic readout\",\n      \"pmids\": [\"33051438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Both RPS27L and RPS27 are substrates of neddylation by MDM2 E3 ubiquitin ligase and deneddylation by NEDP1. Blockage of neddylation (with MLN4924) destabilizes RPS27L and RPS27 by shortening their protein half-lives. Neddylation stabilizes RPS27L to confer cancer cell survival.\",\n      \"method\": \"In vivo neddylation assay, siRNA knockdown of MDM2/NEDP1, MLN4924 treatment, pulse-chase half-life assay, apoptosis assay upon knockdown/overexpression\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — identification of neddylation writer (MDM2) and eraser (NEDP1) with functional half-life and survival readouts\",\n      \"pmids\": [\"32779270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Rps27 and Rps27l have inversely correlated mRNA abundance across mouse cell types. Rps27- and Rps27l-ribosomes associate preferentially with different mRNA transcripts. Loss-of-function alleles are homozygous lethal at different developmental stages, but expressing Rps27 protein from the endogenous Rps27l locus (or vice versa) completely rescues lethality, demonstrating the two proteins are functionally equivalent and their retention is driven by subfunctionalized expression patterns.\",\n      \"method\": \"Endogenous protein tagging, ribosome-associated mRNA profiling, mouse knockout and knock-in genetic rescue, developmental lethality staging\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo genetic rescue with endogenous tagging and ribosome-mRNA association profiling; multiple orthogonal methods\",\n      \"pmids\": [\"37306301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Muscle-specific Rps27l knock-in mice exhibit increased muscle mass, enlarged myofiber size, higher proportion of fast-twitch myofibers, and enhanced muscle regeneration. RPS27L overexpression promotes myoblast proliferation while inhibiting differentiation. The N-terminal intrinsically disordered region of RPS27L facilitates liquid-liquid phase separation (LLPS) and interacts with IGF1 mRNA/protein to regulate myogenesis. SIX4 (a myogenic transcription factor) negatively regulates Rps27l expression.\",\n      \"method\": \"Muscle-specific knock-in mouse model, myofiber size/composition analysis, myoblast overexpression/KD, LLPS assay, RNA-binding/IGF1 interaction assay, SIX4 transcription factor binding assay\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KI model with defined phenotype plus LLPS and IGF1 interaction assays, single lab\",\n      \"pmids\": [\"40886325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RPS27L is identified as a direct transcriptional target of p53 lacking the 1st transactivation domain (Δ1stTAD-p53), dependent on the 2nd TAD transcriptional activation activity, confirming RPS27L induction requires at least the 2nd TAD of p53.\",\n      \"method\": \"ChIP-seq, luciferase reporter assay, p53 mutant transactivation analysis\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq with reporter validation, single lab, extends prior p53 target finding with domain specificity\",\n      \"pmids\": [\"31834974\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPS27L is a direct p53 transcriptional target and MDM2 substrate whose N-terminal region binds the MDM2 acidic domain to compete with p53, inhibit MDM2-mediated p53 ubiquitination, and extend p53 half-life; upon ribosomal stress caused by RPS27L loss, stabilized MDM2 degrades MDM4, reducing E3 ligase activity toward p53 and activating p53-dependent apoptosis, while also binding Nbs1 to suppress ATM activation and DNA damage signaling; RPS27L is additionally neddylated by MDM2 and deneddylated by NEDP1 for its stability, promotes DNA interstrand cross-link repair by binding and protecting FANCD2/FANCI from autophagy-lysosomal degradation, regulates autophagy via the β-TrCP–DEPTOR–mTORC1 axis, and in skeletal muscle undergoes liquid-liquid phase separation through its N-terminal disordered region to interact with IGF1 and promote muscle growth.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RPS27L is a ribosomal protein and direct p53 transcriptional target that functions as a key node linking ribosomal stress sensing to p53 pathway regulation, DNA damage repair, and autophagy. Its N-terminal region binds the MDM2 acidic domain, competitively inhibiting MDM2-mediated p53 ubiquitination and extending p53 half-life; upon RPS27L loss, ribosomal stress stabilizes MDM2, which degrades MDM4 to reduce MDM2–MDM4 E3 ligase activity and activate p53-dependent apoptosis, while elevated MDM2 also sequesters Nbs1 to suppress ATM signaling [PMID:21170087, PMID:25144937, PMID:29396424]. RPS27L additionally promotes DNA interstrand cross-link repair by binding and protecting FANCD2/FANCI from p62-mediated autophagic degradation, regulates autophagy through the β-TrCP–DEPTOR–mTORC1 axis, and is itself stabilized by MDM2-mediated neddylation reversed by NEDP1 [PMID:33051438, PMID:30425236, PMID:32779270]. Although RPS27L and its paralog RPS27 are functionally interchangeable as ribosomal proteins—with knock-in of one fully rescuing lethality of the other—they are retained in the genome through subfunctionalized, inversely correlated expression patterns across cell types, and RPS27L uniquely undergoes liquid–liquid phase separation via its N-terminal disordered region to interact with IGF1 and promote skeletal muscle growth [PMID:37306301, PMID:40886325].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing that RPS27L is a direct p53 transcriptional target answered the question of how this ribosomal protein gene is regulated in response to genotoxic stress and linked it to apoptotic signaling.\",\n      \"evidence\": \"Genome-wide chip profiling, EMSA, ChIP, reporter assays, and siRNA in cancer cell lines\",\n      \"pmids\": [\"17057733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which RPS27L promotes etoposide-induced apoptosis was undefined\", \"Which p53 transactivation domain drives RPS27L induction was unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that RPS27L forms nuclear foci after DNA damage and that its loss converts p53-mediated arrest to apoptosis revealed a checkpoint-maintenance function and a role in sustaining p21 expression.\",\n      \"evidence\": \"siRNA knockdown, immunofluorescence, cell cycle/flow cytometry, and western blot in human cancer cells\",\n      \"pmids\": [\"18056458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism connecting RPS27L to p21 protein stability was not determined\", \"Whether nuclear foci represent ribosomal or extra-ribosomal functions was unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapping the RPS27L–MDM2 interaction to the MDM2 acidic domain and showing competitive inhibition of p53 ubiquitination provided a direct molecular mechanism for RPS27L-mediated p53 stabilization.\",\n      \"evidence\": \"Co-immunoprecipitation with domain mapping, in vivo ubiquitination assay, pulse-chase half-life, immunofluorescence colocalization\",\n      \"pmids\": [\"21170087\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the RPS27L–MDM2 interaction was not resolved\", \"Physiological significance of MDM2-mediated RPS27L degradation in vivo was untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"An Rps27l knockout mouse demonstrated that loss of RPS27L triggers ribosomal stress–induced MDM2 stabilization, MDM4 degradation, and p53-dependent hematopoietic stem cell apoptosis, establishing the in vivo relevance of the MDM2–MDM4–p53 regulatory axis.\",\n      \"evidence\": \"Germline mouse knockout with Trp53 genetic epistasis, western blot, flow cytometry, karyotyping, tumor incidence analysis\",\n      \"pmids\": [\"25144937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ribosomal stress from RPS27L loss reflects impaired ribosome assembly or a free ribosomal protein signal was not distinguished\", \"Contribution of non-p53 pathways to postnatal lethality was not assessed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Two studies expanded the consequences of RPS27L loss beyond p53: one showed Rps27l-/- radiosensitivity arises partly through MDM2-mediated Nbs1 sequestration that suppresses ATM activation, while the other revealed RPS27L silencing induces autophagy via β-TrCP destabilization, DEPTOR accumulation, and mTORC1 inactivation.\",\n      \"evidence\": \"Mouse knockout radiation assays with Mdm2 heterozygous rescue and Co-IP (Mdm2–Nbs1); siRNA double knockdown epistasis, autophagy flux, pulse-chase for β-TrCP in human cells and Rps27l-/- MEFs\",\n      \"pmids\": [\"29396424\", \"30425236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the MDM2–Nbs1 interaction is direct or part of a larger complex was not clarified\", \"How RPS27L controls β-TrCP protein stability mechanistically remains undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Three discoveries refined RPS27L's molecular network: it directly binds and protects FANCD2/FANCI from autophagic degradation to promote ICL repair; it is stabilized by MDM2-mediated neddylation reversed by NEDP1; and its p53-dependent induction requires at least the 2nd transactivation domain of p53.\",\n      \"evidence\": \"Reciprocal Co-IP for FANCD2/FANCI with autophagy rescue; in vivo neddylation assay with MDM2/NEDP1 manipulation and half-life assays; ChIP-seq with p53 TAD mutant analysis\",\n      \"pmids\": [\"33051438\", \"32779270\", \"31834974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether neddylation and ubiquitination by MDM2 are competitive modifications on the same sites was not determined\", \"Structural basis for RPS27L recognition of FANCD2/FANCI is unknown\", \"Relative contributions of neddylation versus ubiquitination to RPS27L steady-state levels in vivo remain unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that RPS27L and RPS27 are functionally interchangeable ribosomal proteins retained by subfunctionalized expression answered a long-standing question about paralog divergence versus redundancy.\",\n      \"evidence\": \"Endogenous tagging, ribosome-mRNA profiling, mouse knockout and reciprocal knock-in rescue, developmental staging\",\n      \"pmids\": [\"37306301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the extra-ribosomal functions of RPS27L (MDM2 binding, FANCD2 protection) are shared with RPS27 was not tested\", \"Cell-type-specific requirements for RPS27L versus RPS27 beyond developmental lethality are unexplored\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of RPS27L-driven liquid–liquid phase separation via its N-terminal disordered region and interaction with IGF1 in skeletal muscle established a tissue-specific extra-ribosomal function in myogenesis and muscle growth.\",\n      \"evidence\": \"Muscle-specific knock-in mouse, LLPS assays, IGF1 RNA/protein interaction, SIX4 transcription factor binding analysis\",\n      \"pmids\": [\"40886325\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LLPS formation has been demonstrated in one study and awaits independent confirmation\", \"Whether phase separation is required for the IGF1 interaction or merely correlates with it is unclear\", \"Relevance of LLPS to non-muscle cell types is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include: whether RPS27L's extra-ribosomal functions (MDM2 regulation, FANCD2 protection, LLPS) operate from a free cytoplasmic pool or from assembled ribosomes; the structural basis for RPS27L–MDM2 and RPS27L–FANCD2 interactions; and whether the distinct extra-ribosomal activities are functionally coordinated or independent.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of RPS27L in complex with any partner\", \"Ribosome-associated versus free-protein pools have not been quantified\", \"Integration of neddylation, autophagy, and DNA repair functions into a unified regulatory model is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\n      \"40S ribosomal subunit\"\n    ],\n    \"partners\": [\n      \"MDM2\",\n      \"MDM4\",\n      \"FANCD2\",\n      \"FANCI\",\n      \"NEDP1\",\n      \"NBN\",\n      \"IGF1\",\n      \"BTRC\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}