{"gene":"RPL5","run_date":"2026-06-10T07:46:26","timeline":{"discoveries":[{"year":2007,"finding":"Assembly factors Rpf2 and Rrs1 are required to recruit ribosomal proteins rpL5 (yeast ortholog) and rpL11, along with 5S rRNA, into nascent 90S preribosomal particles. In the absence of this recruitment, 27SB pre-rRNA processing is blocked and abortive 66S pre-rRNPs are prematurely released from the nucleolus to the nucleoplasm and cannot be exported to the cytoplasm. Direct protein-protein interactions between Rpf2, Rrs1, rpL5, and rpL11 were confirmed by in vitro binding assays.","method":"In vitro binding assays, co-immunoprecipitation, sucrose gradient sedimentation, genetic depletion with pre-rRNA processing readout","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — multiple orthogonal methods including in vitro binding assays, co-IP, and functional pre-rRNA processing readouts in yeast ortholog system","pmids":["17938242"],"is_preprint":false},{"year":2013,"finding":"RPL5 is a necessary component of an MDM2/ribosomal protein complex (separate from the ribosome) that functions in a p53-dependent ribosomal-stress checkpoint pathway. SRSF1 overexpression stabilizes p53 by abrogating MDM2-dependent proteasomal degradation through this RPL5-containing MDM2 complex, linking the spliceosomal and ribosomal components in monitoring cell physiology independently of their canonical roles.","method":"Co-immunoprecipitation, knockdown experiments, p53 stabilization assays, cell proliferation and senescence assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP demonstrating RPL5-MDM2 complex, functional knockdown with defined p53 stabilization and senescence phenotype in a single rigorous study","pmids":["23478443"],"is_preprint":false},{"year":2013,"finding":"Loss of RPL5 (or RPL11) in primary human lung fibroblasts does not induce cell cycle arrest but suppresses cell cycle progression by reducing ribosome content and translational capacity, which in turn suppresses the accumulation of cyclins at the translational level. This is distinct from other tumor suppressors and demonstrates that RPL5/RPL11's role in normal cell proliferation is relied upon in lieu of a p53-dependent cell cycle checkpoint.","method":"siRNA knockdown, cell cycle analysis (FACS), ribosome profiling, cyclin protein quantification, primary fibroblast culture","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KD with defined cellular phenotypes, multiple orthogonal readouts (cell cycle, ribosome content, cyclin translation), single lab","pmids":["24061479"],"is_preprint":false},{"year":2018,"finding":"SPIN1 (Spindlin 1) binds RPL5/uL18 and sequesters it in the nucleolus, preventing RPL5 from interacting with MDM2. This alleviates RPL5-mediated inhibition of MDM2 ubiquitin ligase activity toward p53, thereby inactivating p53. SPIN1 deficiency increases ribosome-free RPL5 and RPL11, which are both required for SPIN1 depletion-induced p53 activation.","method":"Co-immunoprecipitation, subcellular fractionation/nucleolar localization experiments, knockdown with p53 activation readout, clonogenic and apoptosis assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, nucleolar localization demonstrated by fractionation, functional rescue experiments showing RPL5 requirement for p53 activation","pmids":["29547122"],"is_preprint":false},{"year":2020,"finding":"MeCP2 represses RPL5 (and RPL11) transcription by binding to their promoter regions. Reduced RPL5 consequently decreases its direct binding to MDM2, relieving MDM2 inhibition and promoting ubiquitination-mediated P53 degradation, thereby facilitating breast cancer cell proliferation.","method":"ChIP assay (MeCP2 binding to RPL5 promoter), co-immunoprecipitation (RPL5-MDM2), siRNA knockdown, overexpression, proliferation and cell cycle assays","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirming promoter binding, Co-IP confirming RPL5-MDM2 interaction, single lab with multiple orthogonal methods","pmids":["32483207"],"is_preprint":false},{"year":2017,"finding":"Perturbation of ribosome biogenesis by HEATR1 ablation activates the RPL5/RPL11-MDM2-p53 ribosome biogenesis stress checkpoint pathway, leading to p53-dependent cell cycle arrest. Depletion of HEATR1 caused disruption of nucleolar structure and RPL5/RPL11-dependent stabilization and activation of p53.","method":"siRNA knockdown of HEATR1, p53 activation assays, cell cycle analysis, RPL5/RPL11 knockdown as epistasis control","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — epistasis by double knockdown (HEATR1 + RPL5/RPL11) establishing pathway position, single lab","pmids":["29143558"],"is_preprint":false},{"year":2022,"finding":"HEATR3 synchronizes the nuclear import of RPL5/uL18 (and RPL11/uL5). HEATR3 variants or depletion impairs nuclear accumulation of uL18 (demonstrated in patient-derived fibroblasts and cell lines), disrupts pre-rRNA processing and ribosomal subunit formation, and causes DBA-like phenotypes including abnormal erythrocyte maturation and proliferation defects.","method":"Patient-derived fibroblast analysis, HEATR3 knockdown/variant expression in cell lines and yeast models, subcellular fractionation for nuclear uL18 accumulation, pre-rRNA processing assays, hematopoietic progenitor differentiation assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods across multiple model systems (human cells, yeast), patient-derived cells, direct measurement of nuclear RPL5 accumulation with functional consequences","pmids":["35213692"],"is_preprint":false},{"year":2020,"finding":"WDR74 modulates RPL5 protein levels and consequently regulates MDM2-mediated ubiquitination and degradation of p53. WDR74 overexpression reduces RPL5 protein levels, thereby insulating MDM2 from RPL5 inhibition and allowing p53 degradation, promoting melanoma proliferation and metastasis.","method":"Co-immunoprecipitation, protein stability assays, gain/loss-of-function (WDR74), Western blot for RPL5/MDM2/p53 levels, in vivo xenograft","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, protein stability assays, and functional phenotype, single lab with multiple orthogonal methods","pmids":["32005977"],"is_preprint":false},{"year":2022,"finding":"Olaparib (PARP inhibitor) triggers nucleolar stress by inhibiting pre-rRNA biosynthesis, resulting in enhanced interaction between RPL5 and RPL11 with MDM2, thereby stabilizing and activating p53. Knockdown of RPL5 and RPL11 prevents Olaparib-induced p53 activation.","method":"Co-immunoprecipitation (RPL5-MDM2 interaction), siRNA knockdown of RPL5/RPL11, pre-rRNA synthesis inhibition assays, p53 reporter assays","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating enhanced RPL5-MDM2 interaction, epistatic knockdown showing RPL5/RPL11 requirement, single lab","pmids":["35719981"],"is_preprint":false},{"year":2023,"finding":"RNA-binding motif protein 10 (RBM10) directly binds RPL5/uL18 and RPL11/uL5, and this interaction boosts RBM10's ability to promote c-Myc ubiquitin-dependent degradation. Cancer-derived mutant RBM10-I316F fails to bind uL18 and uL5 and cannot inactivate c-Myc, demonstrating that RPL5 functions as a co-regulator of c-Myc degradation through its interaction with RBM10.","method":"Co-immunoprecipitation, ubiquitination assays, RBM10 mutant analysis, cell growth and proliferation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, mutational analysis of binding interface, functional ubiquitination and proliferation readouts in a single rigorous study","pmids":["38032932"],"is_preprint":false},{"year":2022,"finding":"DDX24 interacts with RPL5 and promotes its ubiquitination and proteasomal degradation, thereby destabilizing RPL5 protein and promoting NSCLC cell migration and invasion.","method":"Co-immunoprecipitation followed by mass spectrometry, protein stability assays, ubiquitination assays, siRNA knockdown and overexpression with migration/invasion readouts","journal":"Cancer medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification of interaction, protein stability and ubiquitination assays confirming mechanism, single lab","pmids":["35864588"],"is_preprint":false},{"year":2025,"finding":"hMTR4 promotes rRNA processing in an RNA helicase-dependent manner, increasing mature rRNA that sequesters RPL5 in the nucleolus, thereby reducing the pool of RPL5 available to bind MDM2 in the nucleoplasm, consequently promoting MDM2-mediated p53 degradation. Silencing RPL5 blocked the effect of hMTR4 knockdown in upregulating p53, and hMTR4 overexpression abrogated RPL5-stimulated p53 activity.","method":"Gain/loss-of-function of hMTR4, subcellular fractionation, Co-immunoprecipitation (RPL5-MDM2), rRNA processing assays, p53 ubiquitination and protein level assays, epistasis by RPL5 knockdown","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (fractionation, Co-IP, epistasis), mechanistic dissection of nucleolar sequestration mechanism, single lab","pmids":["40652043"],"is_preprint":false},{"year":2020,"finding":"Disruption of 40S ribosomal assembly (by repression of small subunit ribosomal protein genes) paradoxically causes accumulation of extra-ribosomal RPL5/uL18, and this extra-ribosomal uL18 is formed during 60S assembly rather than during degradation of mature cytoplasmic 60S subunits. The extent of uL18 accumulation varies depending on which 40S ribosomal protein is repressed.","method":"Sucrose gradient sedimentation, ribosomal protein gene repression (yeast model), fractionation to distinguish ribosomal vs. extra-ribosomal uL18","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct fractionation experiments in yeast model, multiple 40S RP repressions tested, single lab","pmids":["31986150"],"is_preprint":false},{"year":2014,"finding":"In murine embryonic stem cells haploinsufficient for Rpl5, there is a significant delay in G2/M cell cycle phase that is not rescued by p53 knockdown, and a more pronounced growth defect compared to Rps19 haploinsufficient cells. Rpl5 mutant ES cells showed polysome defects but no significant increase in p53 protein expression (unlike Rps19 mutants), indicating p53-independent cell cycle and growth effects.","method":"Gene trap murine ES cell lines, polysome profiling, cell cycle analysis (FACS), p53 knockdown rescue experiments, embryoid body differentiation assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct comparison of Rpl5 vs Rps19 haploinsufficient cells with multiple readouts, p53 epistasis tested, single lab","pmids":["24558476"],"is_preprint":false},{"year":2021,"finding":"RPL5 haploinsufficiency specifically induces p53-mediated apoptosis in chondrocytes (but not osteoblasts) through MDM2 inhibition. Phosphorylation of MDM2 was significantly decreased in RPL5 haploinsufficient chondrocytes, and pro-apoptotic genes BAX and CASP9 were upregulated, providing a mechanism for skeletal physical abnormalities in DBA patients.","method":"iPSC-derived chondrocyte and osteoblast differentiation from DBA patient cells, Western blot for MDM2 phosphorylation and p53 targets, apoptosis assays","journal":"Pathology international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — patient-derived iPSC model with defined molecular readouts, single lab, single study","pmids":["34587661"],"is_preprint":false},{"year":2024,"finding":"RPL5 and RPS19 are recruited to DNA double-strand break (DSB) sites in a poly(ADP-ribose) polymerase (PARP) activity-dependent manner, interact noncovalently with poly(ADP-ribose) chains, and interact with Ku70 and histone H2A. RPL5 knockdown increases end-joining DSB repair pathways and reduces RAD51 levels. RPL5's recruitment to DSBs requires p53, distinguishing its DSB repair role from that of RPS19.","method":"ChIP/laser-microirradiation DSB recruitment assays, co-immunoprecipitation (RPL5-Ku70, RPL5-H2A, RPL5-PAR), DSB repair pathway reporter assays, RAD51 foci counting, knockdown experiments","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods demonstrating RPL5 recruitment to DSBs and interaction with repair factors, preprint not yet peer-reviewed","pmids":["39416207"],"is_preprint":true},{"year":2025,"finding":"RPL5 haploinsufficiency causes hematopoietic stem and progenitor cell (HSPC) accumulation and prenatal lethality via p53-mediated ferroptosis of mature erythroid progenitors in fetal hematopoiesis, which is mechanistically distinct from RPS19 haploinsufficiency (which causes HSPC depletion via p53-dependent apoptosis).","method":"In vivo mouse models of RPL5 and RPS19 haploinsufficiency, HSPC flow cytometry, cell death pathway analysis (ferroptosis vs. apoptosis markers), p53 pathway activation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic models with rigorous pathway dissection, replicated across preprint and peer-reviewed publication","pmids":["41951665"],"is_preprint":false},{"year":2004,"finding":"RpL5 in Drosophila is haplo-insufficient; heterozygous RpL5 mutations cause classic Minute phenotypes (small bristles, delayed development) and result in abnormally large wings due to increased cell size, demonstrating that RpL5 is limiting for growth control and translational regulation of organ size.","method":"Genetic screen, point mutation identification, heterozygous mutant phenotype analysis, wing size and cell size measurement","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — classical genetics in Drosophila ortholog with defined growth phenotype, replicated for multiple alleles","pmids":["15520262"],"is_preprint":false},{"year":2025,"finding":"The RPL5-I60V mutation (found in T-ALL) causes both quantitative and qualitative alterations in large ribosomal subunit production. Ribosomes containing the mutant RPL5-I60V exhibit intrinsically increased protein synthesis activity, correlating with enhanced cellular proliferation, and confer increased sensitivity to most translation-targeting compounds (except hygromycin B).","method":"CRISPR-Cas9 knock-in of RPL5-I60V in Jurkat cells, ribosome biogenesis assays, global translation measurement, proliferation assays, drug sensitivity panel","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct CRISPR knock-in with rigorous functional characterization of translation and ribosome biogenesis, single lab","pmids":["41177179"],"is_preprint":false},{"year":2024,"finding":"Inhibition of ribosome biogenesis by Nat10 deletion causes translocation of RPL5 and RPL11 into acinar cell nucleoplasm, which triggers p53-dependent cell death. Deletion of p53 rescues acinar cells from apoptosis but not from morphological/functional abnormalities, demonstrating that nucleoplasmic RPL5/RPL11 translocation activates p53-dependent and p53-independent consequences of ribosome biogenesis failure.","method":"Conditional Nat10 knockout mouse model, immunolocalization of RPL5/RPL11, p53 deletion epistasis, histology and functional assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with direct localization and epistasis experiments, preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.09.25.614959"],"is_preprint":true},{"year":2024,"finding":"PRDM16 binds to the RPL5 promoter and enhances RPL5 transcription. Additionally, PRDM16 physically associates with RPL5 (co-immunoprecipitation). This PRDM16-mediated enrichment of RPL5 suppresses p53 signaling, leading to upregulation of FCGR2B, which inhibits MAPK (p38 and JNK) signaling and NLRP3/IL-1β inflammasome assembly, protecting retinal ganglion cells from ischemia-reperfusion injury.","method":"ChIP assay (PRDM16 binding to RPL5 promoter), co-immunoprecipitation (PRDM16-RPL5), PRDM16 overexpression/RGC-specific deletion, p53 and downstream pathway assays","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating promoter binding, Co-IP confirming protein interaction, in vivo knockout with functional phenotype, single lab","pmids":["41910727"],"is_preprint":false},{"year":2024,"finding":"ZBTB7A represses RPL5 transcription in pancreatic cancer cells. RPL5 overexpression enhances binding between RPL5 and MDM2 (strengthened by ER stress via PERK-dependent eIF2α phosphorylation), suppressing MDM2-mediated ubiquitination and degradation of P53, and establishing a positive feedback loop where p53 augmentation intensifies ER stress which further enhances RPL5-MDM2 binding.","method":"Co-immunoprecipitation (RPL5-MDM2), ZBTB7A knockdown/overexpression, RPL5 overexpression, p53 ubiquitination assays, ER stress marker quantification, xenograft mouse model","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating RPL5-MDM2 interaction under ER stress, multiple functional readouts, single lab","pmids":["38896079"],"is_preprint":false}],"current_model":"RPL5/uL18 is a large ribosomal subunit protein whose nuclear import depends on HEATR3, and whose incorporation into nascent 60S subunits requires assembly factors (Rpf2/Rrs1 in yeast); when released from the ribosome (under nucleolar/ribosomal stress), extra-ribosomal RPL5 directly binds MDM2 to inhibit its E3 ligase activity, thereby stabilizing p53 and activating cell cycle checkpoints or apoptosis — a pathway modulated upstream by SPIN1 (which sequesters RPL5 in the nucleolus), MeCP2 and ZBTB7A (which repress RPL5 transcription), WDR74 and DDX24 (which promote RPL5 degradation), and hMTR4 (which increases mature rRNA to re-sequester RPL5 in the nucleolus); beyond the MDM2-p53 axis, RPL5 also cooperates with RBM10 to drive c-Myc degradation, participates in DNA double-strand break repair at DSB sites in a PARP-dependent and p53-dependent manner, and controls cell proliferation through its essential role in ribosome biogenesis and translational capacity, with haploinsufficiency causing the ribosomopathy Diamond-Blackfan anemia via p53-mediated ferroptosis of erythroid progenitors."},"narrative":{"mechanistic_narrative":"RPL5/uL18 is a structural protein of the large (60S) ribosomal subunit that doubles as a sensor of ribosome biogenesis stress, coupling assembly status to the p53 tumor suppressor pathway [PMID:23478443, PMID:29143558]. Its incorporation into nascent particles requires dedicated assembly factors that co-recruit RPL5, RPL11 and 5S rRNA into preribosomes, a step whose failure blocks pre-rRNA processing and nuclear export [PMID:17938242], while nuclear delivery of RPL5 depends on the import adaptor HEATR3 [PMID:35213692]. When ribosome assembly is perturbed — by loss of assembly factors, disruption of 40S subunit formation, or pharmacological nucleolar stress — extra-ribosomal RPL5 accumulates as part of the 5S RNP and directly binds MDM2 to inhibit its E3 ligase activity, stabilizing and activating p53 [PMID:29143558, PMID:35719981, PMID:31986150]. This MDM2-binding pool is set by multiple upstream regulators: SPIN1 and increased mature rRNA (driven by hMTR4) sequester RPL5 in the nucleolus away from MDM2 [PMID:29547122, PMID:40652043]; WDR74 and DDX24 lower RPL5 protein levels by promoting its degradation [PMID:32005977, PMID:35864588]; and transcription factors MeCP2 and ZBTB7A repress, while PRDM16 enhances, RPL5 expression, each tuning p53 output and cell proliferation in cancer [PMID:32483207, PMID:41910727, PMID:38896079]. Beyond the MDM2–p53 axis, RPL5 acts as a co-regulator of c-Myc degradation through direct binding to RBM10 [PMID:38032932], and is recruited to DNA double-strand breaks in a PARP- and p53-dependent manner where it interacts with poly(ADP-ribose), Ku70 and histone H2A to influence repair pathway choice [PMID:39416207]. Through its core role in ribosome content and translational capacity, RPL5 limits cell cycle progression and organismal growth independently of p53 [PMID:24061479, PMID:24558476]. RPL5 haploinsufficiency causes the ribosomopathy Diamond-Blackfan anemia, driving p53-mediated ferroptosis of erythroid progenitors and apoptosis in specific lineages such as chondrocytes [PMID:41951665, PMID:34587661].","teleology":[{"year":2007,"claim":"Established how RPL5 is delivered into the ribosome assembly pathway, showing it is co-recruited with RPL11 and 5S rRNA by dedicated assembly factors and that this step gates pre-rRNA processing and subunit export.","evidence":"In vitro binding assays, co-IP, and genetic depletion with pre-rRNA processing readouts in the yeast ortholog system","pmids":["17938242"],"confidence":"High","gaps":["Does not address how the extra-ribosomal pool is generated in human cells","Human orthologs of Rpf2/Rrs1 not directly tested here"]},{"year":2013,"claim":"Defined the extra-ribosomal function of RPL5 as a necessary component of an MDM2-containing complex that stabilizes p53, separating this checkpoint role from RPL5's ribosomal role.","evidence":"Reciprocal co-IP, knockdown, and p53 stabilization/senescence assays linking SRSF1 to the RPL5-MDM2 complex","pmids":["23478443"],"confidence":"High","gaps":["Stoichiometry of the 5S RNP–MDM2 complex not resolved","Direct binding interface of RPL5 on MDM2 not mapped here"]},{"year":2013,"claim":"Showed that RPL5 controls normal proliferation through translational capacity rather than a p53 checkpoint, by limiting ribosome content and cyclin translation.","evidence":"siRNA knockdown with cell cycle analysis, ribosome profiling and cyclin quantification in primary fibroblasts","pmids":["24061479"],"confidence":"High","gaps":["Which specific transcripts are most sensitive to reduced ribosome content not defined","Relationship between this role and the MDM2-p53 pool not integrated"]},{"year":2014,"claim":"Demonstrated p53-independent consequences of RPL5 loss, with haploinsufficient ES cells showing G2/M delay and growth defects not rescued by p53 knockdown.","evidence":"Gene-trap murine ES cell lines with polysome profiling, cell cycle analysis and p53 knockdown rescue","pmids":["24558476"],"confidence":"Medium","gaps":["Molecular basis of the p53-independent G2/M delay unknown","Distinct from RPS19 phenotype but shared/divergent mechanisms not fully resolved"]},{"year":2017,"claim":"Placed RPL5 downstream of broad ribosome biogenesis perturbation, showing HEATR1 ablation activates the RPL5/RPL11-MDM2-p53 checkpoint.","evidence":"siRNA knockdown of HEATR1 with RPL5/RPL11 double-knockdown epistasis and p53 activation/cell cycle readouts","pmids":["29143558"],"confidence":"Medium","gaps":["Does not establish direct biochemical link between HEATR1 loss and free RPL5 generation","Single-lab epistasis"]},{"year":2018,"claim":"Identified nucleolar sequestration as a regulatory mechanism: SPIN1 binds RPL5 and retains it in the nucleolus, restricting the MDM2-binding pool and inactivating p53.","evidence":"Reciprocal co-IP, nucleolar fractionation, and rescue showing RPL5 requirement for p53 activation upon SPIN1 depletion","pmids":["29547122"],"confidence":"High","gaps":["Structural basis of SPIN1-RPL5 binding not defined","Whether SPIN1 acts on 5S RNP or free RPL5 unclear"]},{"year":2020,"claim":"Showed transcriptional control of the RPL5 set point: MeCP2 represses RPL5 transcription to lower the MDM2-inhibitory pool and promote p53 degradation in breast cancer.","evidence":"ChIP for promoter binding, RPL5-MDM2 co-IP, knockdown/overexpression with proliferation assays","pmids":["32483207"],"confidence":"Medium","gaps":["Direct vs indirect promoter effects not fully separated","Single cancer context"]},{"year":2020,"claim":"Established post-translational control of RPL5 abundance, with WDR74 reducing RPL5 protein to insulate MDM2 and permit p53 degradation in melanoma.","evidence":"Co-IP, protein stability assays, WDR74 gain/loss-of-function, and xenograft","pmids":["32005977"],"confidence":"Medium","gaps":["Whether WDR74 acts via a defined E3 ligase not shown","Direct vs indirect effect on RPL5 stability unresolved"]},{"year":2020,"claim":"Clarified the source of extra-ribosomal RPL5, showing that disrupting 40S assembly generates free uL18 during 60S assembly rather than from turnover of mature subunits.","evidence":"Sucrose gradient sedimentation and fractionation after small-subunit RP gene repression in yeast","pmids":["31986150"],"confidence":"Medium","gaps":["Mechanism coupling 40S disruption to free 60S-component release not defined","Human relevance inferred from yeast"]},{"year":2021,"claim":"Linked RPL5 haploinsufficiency to lineage-specific p53-mediated apoptosis, accounting for skeletal abnormalities in Diamond-Blackfan anemia.","evidence":"iPSC-derived chondrocyte vs osteoblast differentiation from DBA patient cells, MDM2 phosphorylation and apoptosis readouts","pmids":["34587661"],"confidence":"Medium","gaps":["Basis for chondrocyte- vs osteoblast-selective sensitivity unknown","Single-lab patient-derived model"]},{"year":2022,"claim":"Defined the nuclear import requirement for RPL5, identifying HEATR3 as an adaptor whose loss impairs nuclear uL18 accumulation, ribosome assembly, and produces DBA-like phenotypes.","evidence":"Patient-derived fibroblasts, HEATR3 depletion/variant expression across human and yeast systems, fractionation and pre-rRNA processing assays","pmids":["35213692"],"confidence":"High","gaps":["Whether HEATR3 import defects feed into the p53 checkpoint not directly tested","Import mechanism at molecular level not resolved"]},{"year":2022,"claim":"Extended the regulatory network to RPL5 protein turnover by DDX24, which promotes RPL5 ubiquitination and degradation to drive NSCLC migration/invasion.","evidence":"Co-IP/MS, protein stability and ubiquitination assays, knockdown/overexpression with migration readouts","pmids":["35864588"],"confidence":"Medium","gaps":["E3 ligase mediating DDX24-dependent RPL5 degradation not identified","Connection to p53 output not directly shown"]},{"year":2022,"claim":"Demonstrated pharmacological induction of the RPL5-MDM2-p53 checkpoint, with PARP inhibition causing nucleolar stress that enhances RPL5-MDM2 binding.","evidence":"Co-IP of RPL5-MDM2, RPL5/RPL11 knockdown epistasis, pre-rRNA inhibition and p53 reporter assays","pmids":["35719981"],"confidence":"Medium","gaps":["Direct effect of olaparib on rRNA synthesis machinery not mechanistically detailed","Single-lab"]},{"year":2023,"claim":"Identified an MDM2-independent effector role: RPL5 directly binds RBM10 to enhance RBM10-driven c-Myc ubiquitin-dependent degradation, with a cancer mutation in RBM10 abolishing both binding and c-Myc control.","evidence":"Reciprocal co-IP, ubiquitination assays, and RBM10 mutational interface analysis with proliferation readouts","pmids":["38032932"],"confidence":"High","gaps":["Whether free RPL5 or ribosomal RPL5 engages RBM10 unclear","Structural detail of RPL5-RBM10 interface not resolved"]},{"year":2024,"claim":"Added a transcriptional activator to the network: PRDM16 binds and enhances the RPL5 promoter and physically associates with RPL5 to suppress p53 and protect retinal ganglion cells via downstream FCGR2B/MAPK/NLRP3 signaling.","evidence":"ChIP, co-IP, PRDM16 overexpression and RGC-specific deletion with pathway assays","pmids":["41910727"],"confidence":"Medium","gaps":["Direct vs indirect contribution of the PRDM16-RPL5 physical interaction not separated","Single context"]},{"year":2024,"claim":"Implicated RPL5 in DNA double-strand break repair, showing PARP- and p53-dependent recruitment to breaks and interactions with PAR, Ku70 and H2A that bias repair pathway choice.","evidence":"Laser-microirradiation recruitment, co-IP with repair factors, DSB repair reporters and RAD51 foci (preprint)","pmids":["39416207"],"confidence":"Medium","gaps":["Preprint not yet peer-reviewed","Whether DSB role uses extra-ribosomal or 5S-RNP-bound RPL5 unknown","Mechanism linking RPL5 to RAD51 reduction not defined"]},{"year":2024,"claim":"Confirmed in vivo that biogenesis failure drives nucleoplasmic RPL5/RPL11 translocation and p53-dependent cell death, while also revealing p53-independent functional defects.","evidence":"Conditional Nat10 knockout mouse, RPL5/RPL11 immunolocalization and p53 deletion epistasis (preprint)","pmids":["bio_10.1101_2024.09.25.614959"],"confidence":"Medium","gaps":["Preprint not yet peer-reviewed","Nature of p53-independent defects not molecularly defined"]},{"year":2025,"claim":"Resolved how mature rRNA tunes the RPL5 checkpoint, with hMTR4 promoting rRNA processing to sequester RPL5 in the nucleolus and reduce the MDM2-binding pool.","evidence":"hMTR4 gain/loss-of-function, fractionation, RPL5-MDM2 co-IP, and RPL5 knockdown epistasis on p53","pmids":["40652043"],"confidence":"High","gaps":["Quantitative relationship between rRNA levels and free RPL5 not modeled","Whether sequestration is via 5S RNP or free protein unclear"]},{"year":2025,"claim":"Defined the in vivo mechanism of RPL5-driven Diamond-Blackfan anemia as p53-mediated ferroptosis of erythroid progenitors, mechanistically distinct from RPS19-driven apoptosis.","evidence":"In vivo mouse haploinsufficiency models with HSPC flow cytometry and ferroptosis-vs-apoptosis pathway dissection","pmids":["41951665"],"confidence":"High","gaps":["Why erythroid progenitors specifically undergo ferroptosis not fully explained","Link between p53 activation and ferroptosis effectors not detailed"]},{"year":2025,"claim":"Showed a disease-associated RPL5 point mutation alters ribosome output, with RPL5-I60V conferring increased translational activity and proliferation in T-ALL.","evidence":"CRISPR knock-in of RPL5-I60V in Jurkat cells with ribosome biogenesis, global translation, proliferation and drug-sensitivity assays","pmids":["41177179"],"confidence":"Medium","gaps":["Structural basis for hyperactive translation not defined","Whether the mutation affects the MDM2 checkpoint untested"]},{"year":null,"claim":"It remains unresolved which molecular form of RPL5 (free protein versus the 5S RNP) engages each of its diverse partners (MDM2, RBM10, DSB repair factors) and how cells partition RPL5 among ribosome assembly, checkpoint signaling, and these extra-ribosomal roles.","evidence":"No timeline study directly compares the RPL5 species engaged across its distinct functional contexts","pmids":[],"confidence":"Low","gaps":["Form-specific binding partners not mapped","Quantitative flux of RPL5 between pools unmeasured","Integration of MDM2-p53, c-Myc, and DSB roles not unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,18]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,3,9,11]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[3,11,12]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[3,19]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[0,12,18]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,6,12]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,2,13]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[14,16]},{"term_id":"R-HSA-73894","term_label":"DNA 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The small ribosomal subunit (SSU) binds messenger RNAs (mRNAs) and translates the encoded message by selecting cognate aminoacyl-transfer RNA (tRNA) molecules. The large subunit (LSU) contains the ribosomal catalytic site termed the peptidyl transferase center (PTC), which catalyzes the formation of peptide bonds, thereby polymerizing the amino acids delivered by tRNAs into a polypeptide chain. The nascent polypeptides leave the ribosome through a tunnel in the LSU and interact with protein factors that function in enzymatic processing, targeting, and the membrane insertion of nascent chains at the exit of the ribosomal tunnel. As part of the 5S RNP/5S ribonucleoprotein particle it is an essential component of the LSU, required for its formation and the maturation of rRNAs (PubMed:12962325, PubMed:19061985, PubMed:23636399, PubMed:24120868). It also couples ribosome biogenesis to p53/TP53 activation. As part of the 5S RNP it accumulates in the nucleoplasm and inhibits MDM2, when ribosome biogenesis is perturbed, mediating the stabilization and the activation of TP53 (PubMed:24120868)","subcellular_location":"Cytoplasm; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P46777/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RPL5","classification":"Common 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WDR75","url":"https://www.omim.org/entry/620341"},{"mim_id":"620072","title":"DIAMOND-BLACKFAN ANEMIA 21; DBA21","url":"https://www.omim.org/entry/620072"},{"mim_id":"614951","title":"HEAT REPEAT-CONTAINING PROTEIN 3; HEATR3","url":"https://www.omim.org/entry/614951"},{"mim_id":"613309","title":"DIAMOND-BLACKFAN ANEMIA 10; DBA10","url":"https://www.omim.org/entry/613309"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Nucleoli rim","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPL5"},"hgnc":{"alias_symbol":["L5","PPP1R135","uL18"],"prev_symbol":[]},"alphafold":{"accession":"P46777","domains":[{"cath_id":"3.30.420.100","chopping":"21-248","consensus_level":"high","plddt":96.0089,"start":21,"end":248}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P46777","model_url":"https://alphafold.ebi.ac.uk/files/AF-P46777-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P46777-F1-predicted_aligned_error_v6.png","plddt_mean":94.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPL5","jax_strain_url":"https://www.jax.org/strain/search?query=RPL5"},"sequence":{"accession":"P46777","fasta_url":"https://rest.uniprot.org/uniprotkb/P46777.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P46777/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P46777"}},"corpus_meta":[{"pmid":"23263491","id":"PMC_23263491","title":"Exome sequencing 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hematology/oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33122585","citation_count":5,"is_preprint":false},{"pmid":"32309614","id":"PMC_32309614","title":"Rpl5-Inducible Mouse Model for Studying Diamond-Blackfan Anemia.","date":"2019","source":"Discoveries (Craiova, Romania)","url":"https://pubmed.ncbi.nlm.nih.gov/32309614","citation_count":4,"is_preprint":false},{"pmid":"22803003","id":"PMC_22803003","title":"The spectrum of non-classical Diamond-Blackfan anemia: a case of late beginning transfusion dependency associated to a new RPL5 mutation.","date":"2012","source":"Pediatric reports","url":"https://pubmed.ncbi.nlm.nih.gov/22803003","citation_count":4,"is_preprint":false},{"pmid":"34032749","id":"PMC_34032749","title":"The important role of MDM2, RPL5, and TP53 in mycophenolic acid-induced cleft lip and 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36361707","citation_count":2,"is_preprint":false},{"pmid":"29895157","id":"PMC_29895157","title":"Construction, identification, and immunogenic assessments of an HSV-1 mutant vaccine with a UL18 deletion.","date":"2018","source":"Acta virologica","url":"https://pubmed.ncbi.nlm.nih.gov/29895157","citation_count":2,"is_preprint":false},{"pmid":"38004002","id":"PMC_38004002","title":"A De Novo Frameshift Mutation in RPL5 with Classical Phenotype Abnormalities and Worsening Anemia Diagnosed in a Young Adult-A Case Report and Review of the Literature.","date":"2023","source":"Medicina (Kaunas, Lithuania)","url":"https://pubmed.ncbi.nlm.nih.gov/38004002","citation_count":2,"is_preprint":false},{"pmid":"34483448","id":"PMC_34483448","title":"Genetic Variants of RPL5 and RPL9 Genes among Saudi Patients Diagnosed with Thrombosis.","date":"2021","source":"Medical archives (Sarajevo, Bosnia and Herzegovina)","url":"https://pubmed.ncbi.nlm.nih.gov/34483448","citation_count":2,"is_preprint":false},{"pmid":"34537545","id":"PMC_34537545","title":"The important role of RPS14, RPL5 and MDM2 in TP53-associated ribosome stress in mycophenolic acid-induced microtia.","date":"2021","source":"International journal of pediatric otorhinolaryngology","url":"https://pubmed.ncbi.nlm.nih.gov/34537545","citation_count":2,"is_preprint":false},{"pmid":"39769249","id":"PMC_39769249","title":"Immune Response Elicited by Recombinant Adenovirus-Delivered Glycoprotein B and Nucleocapsid Protein UL18 and UL25 of HSV-1 in Mice.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39769249","citation_count":1,"is_preprint":false},{"pmid":"31956228","id":"PMC_31956228","title":"Gene disruption of ribosomal protein L5 (RPL5) decreased the sensitivity of CHO-K1 cells to uncoupler carbonylcyanide-3-chlorophenylhydrazone.","date":"2019","source":"Drug discoveries & therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/31956228","citation_count":1,"is_preprint":false},{"pmid":"29141292","id":"PMC_29141292","title":"[The difference expression and diagnostic value of RPL5 in papillary thyroid carcinoma of children and adults].","date":"2017","source":"Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery","url":"https://pubmed.ncbi.nlm.nih.gov/29141292","citation_count":1,"is_preprint":false},{"pmid":"39416207","id":"PMC_39416207","title":"RPS19 and RPL5, the most commonly mutated genes in Diamond Blackfan anemia, impact DNA double-strand break repair.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39416207","citation_count":0,"is_preprint":false},{"pmid":"41041537","id":"PMC_41041537","title":"RPS19 and RPL5 Haploinsufficient Models Reveal Divergent Ribosomal Subunit Controls of Fetal Hematopoiesis.","date":"2025","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/41041537","citation_count":0,"is_preprint":false},{"pmid":"41177179","id":"PMC_41177179","title":"Ribosomal protein L5 (RPL5/uL18) I60V mutation is associated to increased translation and modulates drug sensitivity in T-cell acute lymphoblastic leukemia cells.","date":"2025","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/41177179","citation_count":0,"is_preprint":false},{"pmid":"41951665","id":"PMC_41951665","title":"RPS19 and RPL5 haploinsufficient models reveal divergent ribosomal subunit controls of fetal hematopoiesis.","date":"2026","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/41951665","citation_count":0,"is_preprint":false},{"pmid":"41413025","id":"PMC_41413025","title":"RPL5 deficiency-induced ribosomal stress targets a select subset of proteins and inhibits the PI3K-Akt-mTOR signaling pathway to eradicate leukemia stem cells.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41413025","citation_count":0,"is_preprint":false},{"pmid":"40429805","id":"PMC_40429805","title":"Circaea mollis Siebold & Zucc. Induces Apoptosis in Colorectal Cancer Cells by Inhibiting c-Myc Through the Mediation of RPL5.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40429805","citation_count":0,"is_preprint":false},{"pmid":"41910727","id":"PMC_41910727","title":"PRDM16 protects retinal ganglion cells from ischemia-reperfusion Injury by regulating the RPL5/p53 axis.","date":"2026","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/41910727","citation_count":0,"is_preprint":false},{"pmid":"30933022","id":"PMC_30933022","title":"A Novel Deletion in the RPL5 Gene in a Lebanese Child With Diamond Blackfan Anemia Unresponsive to Steroid Treatment.","date":"2020","source":"Journal of pediatric hematology/oncology","url":"https://pubmed.ncbi.nlm.nih.gov/30933022","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.18.687986","title":"Translatome and translation dynamics analysis of a RiboCancer cell line panel reveals that leukemia-associated Rps15 mutations rewire translation through codon-specific tRNA accommodation defects","date":"2025-11-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.18.687986","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.05.22.654334","title":"A lipid metabolism defect is an underlying contributor to Diamond Blackfan anemia syndrome","date":"2025-05-27","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.22.654334","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.05.03.652004","title":"Exposure to PFOA and GenX elicits cell type-specific impacts on p53 and TGF-β signaling pathways","date":"2025-05-03","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.03.652004","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.25.614959","title":"Inhibition of Ribosome Biogenesis  <i>in vivo</i>  Causes p53-Dependent Death and p53-Independent Dysfunction","date":"2024-09-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.25.614959","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.09.617419","title":"Skeletal muscle ribosome analysis: a comparison of common assay methods and utilization of a novel RiboAb antibody cocktail","date":"2024-10-09","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.09.617419","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45170,"output_tokens":6155,"usd":0.113918,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14933,"output_tokens":6311,"usd":0.11622,"stage2_stop_reason":"end_turn"},"total_usd":0.230138,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"Assembly factors Rpf2 and Rrs1 are required to recruit ribosomal proteins rpL5 (yeast ortholog) and rpL11, along with 5S rRNA, into nascent 90S preribosomal particles. In the absence of this recruitment, 27SB pre-rRNA processing is blocked and abortive 66S pre-rRNPs are prematurely released from the nucleolus to the nucleoplasm and cannot be exported to the cytoplasm. Direct protein-protein interactions between Rpf2, Rrs1, rpL5, and rpL11 were confirmed by in vitro binding assays.\",\n      \"method\": \"In vitro binding assays, co-immunoprecipitation, sucrose gradient sedimentation, genetic depletion with pre-rRNA processing readout\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — multiple orthogonal methods including in vitro binding assays, co-IP, and functional pre-rRNA processing readouts in yeast ortholog system\",\n      \"pmids\": [\"17938242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RPL5 is a necessary component of an MDM2/ribosomal protein complex (separate from the ribosome) that functions in a p53-dependent ribosomal-stress checkpoint pathway. SRSF1 overexpression stabilizes p53 by abrogating MDM2-dependent proteasomal degradation through this RPL5-containing MDM2 complex, linking the spliceosomal and ribosomal components in monitoring cell physiology independently of their canonical roles.\",\n      \"method\": \"Co-immunoprecipitation, knockdown experiments, p53 stabilization assays, cell proliferation and senescence assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP demonstrating RPL5-MDM2 complex, functional knockdown with defined p53 stabilization and senescence phenotype in a single rigorous study\",\n      \"pmids\": [\"23478443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of RPL5 (or RPL11) in primary human lung fibroblasts does not induce cell cycle arrest but suppresses cell cycle progression by reducing ribosome content and translational capacity, which in turn suppresses the accumulation of cyclins at the translational level. This is distinct from other tumor suppressors and demonstrates that RPL5/RPL11's role in normal cell proliferation is relied upon in lieu of a p53-dependent cell cycle checkpoint.\",\n      \"method\": \"siRNA knockdown, cell cycle analysis (FACS), ribosome profiling, cyclin protein quantification, primary fibroblast culture\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined cellular phenotypes, multiple orthogonal readouts (cell cycle, ribosome content, cyclin translation), single lab\",\n      \"pmids\": [\"24061479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPIN1 (Spindlin 1) binds RPL5/uL18 and sequesters it in the nucleolus, preventing RPL5 from interacting with MDM2. This alleviates RPL5-mediated inhibition of MDM2 ubiquitin ligase activity toward p53, thereby inactivating p53. SPIN1 deficiency increases ribosome-free RPL5 and RPL11, which are both required for SPIN1 depletion-induced p53 activation.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation/nucleolar localization experiments, knockdown with p53 activation readout, clonogenic and apoptosis assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, nucleolar localization demonstrated by fractionation, functional rescue experiments showing RPL5 requirement for p53 activation\",\n      \"pmids\": [\"29547122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MeCP2 represses RPL5 (and RPL11) transcription by binding to their promoter regions. Reduced RPL5 consequently decreases its direct binding to MDM2, relieving MDM2 inhibition and promoting ubiquitination-mediated P53 degradation, thereby facilitating breast cancer cell proliferation.\",\n      \"method\": \"ChIP assay (MeCP2 binding to RPL5 promoter), co-immunoprecipitation (RPL5-MDM2), siRNA knockdown, overexpression, proliferation and cell cycle assays\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming promoter binding, Co-IP confirming RPL5-MDM2 interaction, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"32483207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Perturbation of ribosome biogenesis by HEATR1 ablation activates the RPL5/RPL11-MDM2-p53 ribosome biogenesis stress checkpoint pathway, leading to p53-dependent cell cycle arrest. Depletion of HEATR1 caused disruption of nucleolar structure and RPL5/RPL11-dependent stabilization and activation of p53.\",\n      \"method\": \"siRNA knockdown of HEATR1, p53 activation assays, cell cycle analysis, RPL5/RPL11 knockdown as epistasis control\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — epistasis by double knockdown (HEATR1 + RPL5/RPL11) establishing pathway position, single lab\",\n      \"pmids\": [\"29143558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HEATR3 synchronizes the nuclear import of RPL5/uL18 (and RPL11/uL5). HEATR3 variants or depletion impairs nuclear accumulation of uL18 (demonstrated in patient-derived fibroblasts and cell lines), disrupts pre-rRNA processing and ribosomal subunit formation, and causes DBA-like phenotypes including abnormal erythrocyte maturation and proliferation defects.\",\n      \"method\": \"Patient-derived fibroblast analysis, HEATR3 knockdown/variant expression in cell lines and yeast models, subcellular fractionation for nuclear uL18 accumulation, pre-rRNA processing assays, hematopoietic progenitor differentiation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods across multiple model systems (human cells, yeast), patient-derived cells, direct measurement of nuclear RPL5 accumulation with functional consequences\",\n      \"pmids\": [\"35213692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WDR74 modulates RPL5 protein levels and consequently regulates MDM2-mediated ubiquitination and degradation of p53. WDR74 overexpression reduces RPL5 protein levels, thereby insulating MDM2 from RPL5 inhibition and allowing p53 degradation, promoting melanoma proliferation and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, protein stability assays, gain/loss-of-function (WDR74), Western blot for RPL5/MDM2/p53 levels, in vivo xenograft\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, protein stability assays, and functional phenotype, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"32005977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Olaparib (PARP inhibitor) triggers nucleolar stress by inhibiting pre-rRNA biosynthesis, resulting in enhanced interaction between RPL5 and RPL11 with MDM2, thereby stabilizing and activating p53. Knockdown of RPL5 and RPL11 prevents Olaparib-induced p53 activation.\",\n      \"method\": \"Co-immunoprecipitation (RPL5-MDM2 interaction), siRNA knockdown of RPL5/RPL11, pre-rRNA synthesis inhibition assays, p53 reporter assays\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating enhanced RPL5-MDM2 interaction, epistatic knockdown showing RPL5/RPL11 requirement, single lab\",\n      \"pmids\": [\"35719981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNA-binding motif protein 10 (RBM10) directly binds RPL5/uL18 and RPL11/uL5, and this interaction boosts RBM10's ability to promote c-Myc ubiquitin-dependent degradation. Cancer-derived mutant RBM10-I316F fails to bind uL18 and uL5 and cannot inactivate c-Myc, demonstrating that RPL5 functions as a co-regulator of c-Myc degradation through its interaction with RBM10.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, RBM10 mutant analysis, cell growth and proliferation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, mutational analysis of binding interface, functional ubiquitination and proliferation readouts in a single rigorous study\",\n      \"pmids\": [\"38032932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DDX24 interacts with RPL5 and promotes its ubiquitination and proteasomal degradation, thereby destabilizing RPL5 protein and promoting NSCLC cell migration and invasion.\",\n      \"method\": \"Co-immunoprecipitation followed by mass spectrometry, protein stability assays, ubiquitination assays, siRNA knockdown and overexpression with migration/invasion readouts\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification of interaction, protein stability and ubiquitination assays confirming mechanism, single lab\",\n      \"pmids\": [\"35864588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"hMTR4 promotes rRNA processing in an RNA helicase-dependent manner, increasing mature rRNA that sequesters RPL5 in the nucleolus, thereby reducing the pool of RPL5 available to bind MDM2 in the nucleoplasm, consequently promoting MDM2-mediated p53 degradation. Silencing RPL5 blocked the effect of hMTR4 knockdown in upregulating p53, and hMTR4 overexpression abrogated RPL5-stimulated p53 activity.\",\n      \"method\": \"Gain/loss-of-function of hMTR4, subcellular fractionation, Co-immunoprecipitation (RPL5-MDM2), rRNA processing assays, p53 ubiquitination and protein level assays, epistasis by RPL5 knockdown\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (fractionation, Co-IP, epistasis), mechanistic dissection of nucleolar sequestration mechanism, single lab\",\n      \"pmids\": [\"40652043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Disruption of 40S ribosomal assembly (by repression of small subunit ribosomal protein genes) paradoxically causes accumulation of extra-ribosomal RPL5/uL18, and this extra-ribosomal uL18 is formed during 60S assembly rather than during degradation of mature cytoplasmic 60S subunits. The extent of uL18 accumulation varies depending on which 40S ribosomal protein is repressed.\",\n      \"method\": \"Sucrose gradient sedimentation, ribosomal protein gene repression (yeast model), fractionation to distinguish ribosomal vs. extra-ribosomal uL18\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct fractionation experiments in yeast model, multiple 40S RP repressions tested, single lab\",\n      \"pmids\": [\"31986150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In murine embryonic stem cells haploinsufficient for Rpl5, there is a significant delay in G2/M cell cycle phase that is not rescued by p53 knockdown, and a more pronounced growth defect compared to Rps19 haploinsufficient cells. Rpl5 mutant ES cells showed polysome defects but no significant increase in p53 protein expression (unlike Rps19 mutants), indicating p53-independent cell cycle and growth effects.\",\n      \"method\": \"Gene trap murine ES cell lines, polysome profiling, cell cycle analysis (FACS), p53 knockdown rescue experiments, embryoid body differentiation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct comparison of Rpl5 vs Rps19 haploinsufficient cells with multiple readouts, p53 epistasis tested, single lab\",\n      \"pmids\": [\"24558476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RPL5 haploinsufficiency specifically induces p53-mediated apoptosis in chondrocytes (but not osteoblasts) through MDM2 inhibition. Phosphorylation of MDM2 was significantly decreased in RPL5 haploinsufficient chondrocytes, and pro-apoptotic genes BAX and CASP9 were upregulated, providing a mechanism for skeletal physical abnormalities in DBA patients.\",\n      \"method\": \"iPSC-derived chondrocyte and osteoblast differentiation from DBA patient cells, Western blot for MDM2 phosphorylation and p53 targets, apoptosis assays\",\n      \"journal\": \"Pathology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — patient-derived iPSC model with defined molecular readouts, single lab, single study\",\n      \"pmids\": [\"34587661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RPL5 and RPS19 are recruited to DNA double-strand break (DSB) sites in a poly(ADP-ribose) polymerase (PARP) activity-dependent manner, interact noncovalently with poly(ADP-ribose) chains, and interact with Ku70 and histone H2A. RPL5 knockdown increases end-joining DSB repair pathways and reduces RAD51 levels. RPL5's recruitment to DSBs requires p53, distinguishing its DSB repair role from that of RPS19.\",\n      \"method\": \"ChIP/laser-microirradiation DSB recruitment assays, co-immunoprecipitation (RPL5-Ku70, RPL5-H2A, RPL5-PAR), DSB repair pathway reporter assays, RAD51 foci counting, knockdown experiments\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods demonstrating RPL5 recruitment to DSBs and interaction with repair factors, preprint not yet peer-reviewed\",\n      \"pmids\": [\"39416207\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RPL5 haploinsufficiency causes hematopoietic stem and progenitor cell (HSPC) accumulation and prenatal lethality via p53-mediated ferroptosis of mature erythroid progenitors in fetal hematopoiesis, which is mechanistically distinct from RPS19 haploinsufficiency (which causes HSPC depletion via p53-dependent apoptosis).\",\n      \"method\": \"In vivo mouse models of RPL5 and RPS19 haploinsufficiency, HSPC flow cytometry, cell death pathway analysis (ferroptosis vs. apoptosis markers), p53 pathway activation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic models with rigorous pathway dissection, replicated across preprint and peer-reviewed publication\",\n      \"pmids\": [\"41951665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RpL5 in Drosophila is haplo-insufficient; heterozygous RpL5 mutations cause classic Minute phenotypes (small bristles, delayed development) and result in abnormally large wings due to increased cell size, demonstrating that RpL5 is limiting for growth control and translational regulation of organ size.\",\n      \"method\": \"Genetic screen, point mutation identification, heterozygous mutant phenotype analysis, wing size and cell size measurement\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — classical genetics in Drosophila ortholog with defined growth phenotype, replicated for multiple alleles\",\n      \"pmids\": [\"15520262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The RPL5-I60V mutation (found in T-ALL) causes both quantitative and qualitative alterations in large ribosomal subunit production. Ribosomes containing the mutant RPL5-I60V exhibit intrinsically increased protein synthesis activity, correlating with enhanced cellular proliferation, and confer increased sensitivity to most translation-targeting compounds (except hygromycin B).\",\n      \"method\": \"CRISPR-Cas9 knock-in of RPL5-I60V in Jurkat cells, ribosome biogenesis assays, global translation measurement, proliferation assays, drug sensitivity panel\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct CRISPR knock-in with rigorous functional characterization of translation and ribosome biogenesis, single lab\",\n      \"pmids\": [\"41177179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Inhibition of ribosome biogenesis by Nat10 deletion causes translocation of RPL5 and RPL11 into acinar cell nucleoplasm, which triggers p53-dependent cell death. Deletion of p53 rescues acinar cells from apoptosis but not from morphological/functional abnormalities, demonstrating that nucleoplasmic RPL5/RPL11 translocation activates p53-dependent and p53-independent consequences of ribosome biogenesis failure.\",\n      \"method\": \"Conditional Nat10 knockout mouse model, immunolocalization of RPL5/RPL11, p53 deletion epistasis, histology and functional assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with direct localization and epistasis experiments, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.09.25.614959\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PRDM16 binds to the RPL5 promoter and enhances RPL5 transcription. Additionally, PRDM16 physically associates with RPL5 (co-immunoprecipitation). This PRDM16-mediated enrichment of RPL5 suppresses p53 signaling, leading to upregulation of FCGR2B, which inhibits MAPK (p38 and JNK) signaling and NLRP3/IL-1β inflammasome assembly, protecting retinal ganglion cells from ischemia-reperfusion injury.\",\n      \"method\": \"ChIP assay (PRDM16 binding to RPL5 promoter), co-immunoprecipitation (PRDM16-RPL5), PRDM16 overexpression/RGC-specific deletion, p53 and downstream pathway assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating promoter binding, Co-IP confirming protein interaction, in vivo knockout with functional phenotype, single lab\",\n      \"pmids\": [\"41910727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZBTB7A represses RPL5 transcription in pancreatic cancer cells. RPL5 overexpression enhances binding between RPL5 and MDM2 (strengthened by ER stress via PERK-dependent eIF2α phosphorylation), suppressing MDM2-mediated ubiquitination and degradation of P53, and establishing a positive feedback loop where p53 augmentation intensifies ER stress which further enhances RPL5-MDM2 binding.\",\n      \"method\": \"Co-immunoprecipitation (RPL5-MDM2), ZBTB7A knockdown/overexpression, RPL5 overexpression, p53 ubiquitination assays, ER stress marker quantification, xenograft mouse model\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating RPL5-MDM2 interaction under ER stress, multiple functional readouts, single lab\",\n      \"pmids\": [\"38896079\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPL5/uL18 is a large ribosomal subunit protein whose nuclear import depends on HEATR3, and whose incorporation into nascent 60S subunits requires assembly factors (Rpf2/Rrs1 in yeast); when released from the ribosome (under nucleolar/ribosomal stress), extra-ribosomal RPL5 directly binds MDM2 to inhibit its E3 ligase activity, thereby stabilizing p53 and activating cell cycle checkpoints or apoptosis — a pathway modulated upstream by SPIN1 (which sequesters RPL5 in the nucleolus), MeCP2 and ZBTB7A (which repress RPL5 transcription), WDR74 and DDX24 (which promote RPL5 degradation), and hMTR4 (which increases mature rRNA to re-sequester RPL5 in the nucleolus); beyond the MDM2-p53 axis, RPL5 also cooperates with RBM10 to drive c-Myc degradation, participates in DNA double-strand break repair at DSB sites in a PARP-dependent and p53-dependent manner, and controls cell proliferation through its essential role in ribosome biogenesis and translational capacity, with haploinsufficiency causing the ribosomopathy Diamond-Blackfan anemia via p53-mediated ferroptosis of erythroid progenitors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPL5/uL18 is a structural protein of the large (60S) ribosomal subunit that doubles as a sensor of ribosome biogenesis stress, coupling assembly status to the p53 tumor suppressor pathway [#1, #5]. Its incorporation into nascent particles requires dedicated assembly factors that co-recruit RPL5, RPL11 and 5S rRNA into preribosomes, a step whose failure blocks pre-rRNA processing and nuclear export [#0], while nuclear delivery of RPL5 depends on the import adaptor HEATR3 [#6]. When ribosome assembly is perturbed — by loss of assembly factors, disruption of 40S subunit formation, or pharmacological nucleolar stress — extra-ribosomal RPL5 accumulates as part of the 5S RNP and directly binds MDM2 to inhibit its E3 ligase activity, stabilizing and activating p53 [#5, #8, #12]. This MDM2-binding pool is set by multiple upstream regulators: SPIN1 and increased mature rRNA (driven by hMTR4) sequester RPL5 in the nucleolus away from MDM2 [#3, #11]; WDR74 and DDX24 lower RPL5 protein levels by promoting its degradation [#7, #10]; and transcription factors MeCP2 and ZBTB7A repress, while PRDM16 enhances, RPL5 expression, each tuning p53 output and cell proliferation in cancer [#4, #20, #21]. Beyond the MDM2–p53 axis, RPL5 acts as a co-regulator of c-Myc degradation through direct binding to RBM10 [#9], and is recruited to DNA double-strand breaks in a PARP- and p53-dependent manner where it interacts with poly(ADP-ribose), Ku70 and histone H2A to influence repair pathway choice [#15]. Through its core role in ribosome content and translational capacity, RPL5 limits cell cycle progression and organismal growth independently of p53 [#2, #13]. RPL5 haploinsufficiency causes the ribosomopathy Diamond-Blackfan anemia, driving p53-mediated ferroptosis of erythroid progenitors and apoptosis in specific lineages such as chondrocytes [#16, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established how RPL5 is delivered into the ribosome assembly pathway, showing it is co-recruited with RPL11 and 5S rRNA by dedicated assembly factors and that this step gates pre-rRNA processing and subunit export.\",\n      \"evidence\": \"In vitro binding assays, co-IP, and genetic depletion with pre-rRNA processing readouts in the yeast ortholog system\",\n      \"pmids\": [\"17938242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address how the extra-ribosomal pool is generated in human cells\", \"Human orthologs of Rpf2/Rrs1 not directly tested here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the extra-ribosomal function of RPL5 as a necessary component of an MDM2-containing complex that stabilizes p53, separating this checkpoint role from RPL5's ribosomal role.\",\n      \"evidence\": \"Reciprocal co-IP, knockdown, and p53 stabilization/senescence assays linking SRSF1 to the RPL5-MDM2 complex\",\n      \"pmids\": [\"23478443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the 5S RNP–MDM2 complex not resolved\", \"Direct binding interface of RPL5 on MDM2 not mapped here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed that RPL5 controls normal proliferation through translational capacity rather than a p53 checkpoint, by limiting ribosome content and cyclin translation.\",\n      \"evidence\": \"siRNA knockdown with cell cycle analysis, ribosome profiling and cyclin quantification in primary fibroblasts\",\n      \"pmids\": [\"24061479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific transcripts are most sensitive to reduced ribosome content not defined\", \"Relationship between this role and the MDM2-p53 pool not integrated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated p53-independent consequences of RPL5 loss, with haploinsufficient ES cells showing G2/M delay and growth defects not rescued by p53 knockdown.\",\n      \"evidence\": \"Gene-trap murine ES cell lines with polysome profiling, cell cycle analysis and p53 knockdown rescue\",\n      \"pmids\": [\"24558476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the p53-independent G2/M delay unknown\", \"Distinct from RPS19 phenotype but shared/divergent mechanisms not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed RPL5 downstream of broad ribosome biogenesis perturbation, showing HEATR1 ablation activates the RPL5/RPL11-MDM2-p53 checkpoint.\",\n      \"evidence\": \"siRNA knockdown of HEATR1 with RPL5/RPL11 double-knockdown epistasis and p53 activation/cell cycle readouts\",\n      \"pmids\": [\"29143558\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish direct biochemical link between HEATR1 loss and free RPL5 generation\", \"Single-lab epistasis\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified nucleolar sequestration as a regulatory mechanism: SPIN1 binds RPL5 and retains it in the nucleolus, restricting the MDM2-binding pool and inactivating p53.\",\n      \"evidence\": \"Reciprocal co-IP, nucleolar fractionation, and rescue showing RPL5 requirement for p53 activation upon SPIN1 depletion\",\n      \"pmids\": [\"29547122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SPIN1-RPL5 binding not defined\", \"Whether SPIN1 acts on 5S RNP or free RPL5 unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed transcriptional control of the RPL5 set point: MeCP2 represses RPL5 transcription to lower the MDM2-inhibitory pool and promote p53 degradation in breast cancer.\",\n      \"evidence\": \"ChIP for promoter binding, RPL5-MDM2 co-IP, knockdown/overexpression with proliferation assays\",\n      \"pmids\": [\"32483207\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect promoter effects not fully separated\", \"Single cancer context\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established post-translational control of RPL5 abundance, with WDR74 reducing RPL5 protein to insulate MDM2 and permit p53 degradation in melanoma.\",\n      \"evidence\": \"Co-IP, protein stability assays, WDR74 gain/loss-of-function, and xenograft\",\n      \"pmids\": [\"32005977\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether WDR74 acts via a defined E3 ligase not shown\", \"Direct vs indirect effect on RPL5 stability unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Clarified the source of extra-ribosomal RPL5, showing that disrupting 40S assembly generates free uL18 during 60S assembly rather than from turnover of mature subunits.\",\n      \"evidence\": \"Sucrose gradient sedimentation and fractionation after small-subunit RP gene repression in yeast\",\n      \"pmids\": [\"31986150\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling 40S disruption to free 60S-component release not defined\", \"Human relevance inferred from yeast\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked RPL5 haploinsufficiency to lineage-specific p53-mediated apoptosis, accounting for skeletal abnormalities in Diamond-Blackfan anemia.\",\n      \"evidence\": \"iPSC-derived chondrocyte vs osteoblast differentiation from DBA patient cells, MDM2 phosphorylation and apoptosis readouts\",\n      \"pmids\": [\"34587661\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Basis for chondrocyte- vs osteoblast-selective sensitivity unknown\", \"Single-lab patient-derived model\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the nuclear import requirement for RPL5, identifying HEATR3 as an adaptor whose loss impairs nuclear uL18 accumulation, ribosome assembly, and produces DBA-like phenotypes.\",\n      \"evidence\": \"Patient-derived fibroblasts, HEATR3 depletion/variant expression across human and yeast systems, fractionation and pre-rRNA processing assays\",\n      \"pmids\": [\"35213692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HEATR3 import defects feed into the p53 checkpoint not directly tested\", \"Import mechanism at molecular level not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended the regulatory network to RPL5 protein turnover by DDX24, which promotes RPL5 ubiquitination and degradation to drive NSCLC migration/invasion.\",\n      \"evidence\": \"Co-IP/MS, protein stability and ubiquitination assays, knockdown/overexpression with migration readouts\",\n      \"pmids\": [\"35864588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating DDX24-dependent RPL5 degradation not identified\", \"Connection to p53 output not directly shown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated pharmacological induction of the RPL5-MDM2-p53 checkpoint, with PARP inhibition causing nucleolar stress that enhances RPL5-MDM2 binding.\",\n      \"evidence\": \"Co-IP of RPL5-MDM2, RPL5/RPL11 knockdown epistasis, pre-rRNA inhibition and p53 reporter assays\",\n      \"pmids\": [\"35719981\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct effect of olaparib on rRNA synthesis machinery not mechanistically detailed\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified an MDM2-independent effector role: RPL5 directly binds RBM10 to enhance RBM10-driven c-Myc ubiquitin-dependent degradation, with a cancer mutation in RBM10 abolishing both binding and c-Myc control.\",\n      \"evidence\": \"Reciprocal co-IP, ubiquitination assays, and RBM10 mutational interface analysis with proliferation readouts\",\n      \"pmids\": [\"38032932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether free RPL5 or ribosomal RPL5 engages RBM10 unclear\", \"Structural detail of RPL5-RBM10 interface not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added a transcriptional activator to the network: PRDM16 binds and enhances the RPL5 promoter and physically associates with RPL5 to suppress p53 and protect retinal ganglion cells via downstream FCGR2B/MAPK/NLRP3 signaling.\",\n      \"evidence\": \"ChIP, co-IP, PRDM16 overexpression and RGC-specific deletion with pathway assays\",\n      \"pmids\": [\"41910727\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect contribution of the PRDM16-RPL5 physical interaction not separated\", \"Single context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Implicated RPL5 in DNA double-strand break repair, showing PARP- and p53-dependent recruitment to breaks and interactions with PAR, Ku70 and H2A that bias repair pathway choice.\",\n      \"evidence\": \"Laser-microirradiation recruitment, co-IP with repair factors, DSB repair reporters and RAD51 foci (preprint)\",\n      \"pmids\": [\"39416207\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"Whether DSB role uses extra-ribosomal or 5S-RNP-bound RPL5 unknown\", \"Mechanism linking RPL5 to RAD51 reduction not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Confirmed in vivo that biogenesis failure drives nucleoplasmic RPL5/RPL11 translocation and p53-dependent cell death, while also revealing p53-independent functional defects.\",\n      \"evidence\": \"Conditional Nat10 knockout mouse, RPL5/RPL11 immunolocalization and p53 deletion epistasis (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.09.25.614959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"Nature of p53-independent defects not molecularly defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved how mature rRNA tunes the RPL5 checkpoint, with hMTR4 promoting rRNA processing to sequester RPL5 in the nucleolus and reduce the MDM2-binding pool.\",\n      \"evidence\": \"hMTR4 gain/loss-of-function, fractionation, RPL5-MDM2 co-IP, and RPL5 knockdown epistasis on p53\",\n      \"pmids\": [\"40652043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative relationship between rRNA levels and free RPL5 not modeled\", \"Whether sequestration is via 5S RNP or free protein unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the in vivo mechanism of RPL5-driven Diamond-Blackfan anemia as p53-mediated ferroptosis of erythroid progenitors, mechanistically distinct from RPS19-driven apoptosis.\",\n      \"evidence\": \"In vivo mouse haploinsufficiency models with HSPC flow cytometry and ferroptosis-vs-apoptosis pathway dissection\",\n      \"pmids\": [\"41951665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why erythroid progenitors specifically undergo ferroptosis not fully explained\", \"Link between p53 activation and ferroptosis effectors not detailed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed a disease-associated RPL5 point mutation alters ribosome output, with RPL5-I60V conferring increased translational activity and proliferation in T-ALL.\",\n      \"evidence\": \"CRISPR knock-in of RPL5-I60V in Jurkat cells with ribosome biogenesis, global translation, proliferation and drug-sensitivity assays\",\n      \"pmids\": [\"41177179\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for hyperactive translation not defined\", \"Whether the mutation affects the MDM2 checkpoint untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which molecular form of RPL5 (free protein versus the 5S RNP) engages each of its diverse partners (MDM2, RBM10, DSB repair factors) and how cells partition RPL5 among ribosome assembly, checkpoint signaling, and these extra-ribosomal roles.\",\n      \"evidence\": \"No timeline study directly compares the RPL5 species engaged across its distinct functional contexts\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Form-specific binding partners not mapped\", \"Quantitative flux of RPL5 between pools unmeasured\", \"Integration of MDM2-p53, c-Myc, and DSB roles not unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 3, 9, 11]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [3, 11, 12]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [3, 19]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [0, 12, 18]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 6, 12]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 2, 13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [14, 16]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 9, 10]}\n    ],\n    \"complexes\": [\n      \"60S ribosomal subunit\",\n      \"5S ribonucleoprotein particle\",\n      \"MDM2-ribosomal protein complex\"\n    ],\n    \"partners\": [\n      \"MDM2\",\n      \"RBM10\",\n      \"SPIN1\",\n      \"WDR74\",\n      \"DDX24\",\n      \"HEATR3\",\n      \"Ku70\",\n      \"PRDM16\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}