{"gene":"RPS6","run_date":"2026-06-10T07:46:27","timeline":{"discoveries":[{"year":2001,"finding":"Neither phosphorylation of rpS6 nor activation of S6K1 is sufficient or necessary for translational activation of TOP mRNAs; amino acid-dependent translational regulation of TOP mRNAs is fully dependent on PI3-kinase signaling but does not require S6K1 activity or rpS6 phosphorylation, as shown in S6K1-null ES cells and with dominant-negative S6K1 mutants.","method":"Dominant-negative S6K1 overexpression, S6K1 knockout ES cells, PI3-kinase inhibitor (LY294002), rapamycin treatment, polysome analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal genetic and pharmacological approaches, replicated across cell types and confirmed in knockout ES cells","pmids":["11713299"],"is_preprint":false},{"year":2002,"finding":"Translation of TOP mRNAs by growth and mitogenic signals requires PI3-kinase/PKB pathway integrity but neither rpS6 phosphorylation nor S6K1 activity; constitutively active PKBα relieves translational repression in quiescent cells, while complete S6K1/rpS6 inhibition by rapamycin has only mild repressive effects on TOP mRNA translation.","method":"Overexpression of constitutively active and dominant-negative PI3K/PDK1/PKBα mutants, PTEN overexpression, rapamycin treatment, polysome analysis, S6K1-null ES cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal genetic and pharmacological tools, confirmed in knockout ES cells, independent replication of 2001 findings","pmids":["12417714"],"is_preprint":false},{"year":1992,"finding":"The human RPS6 gene is located at chromosome 9p21, spans 3979 bp, comprises six exons, lacks a consensus TATA box, initiates transcription from a single C residue within an 11 bp oligopyrimidine tract, and the 5' region has features of a CpG-rich island.","method":"PCR-based cloning, DNA sequencing, primer extension analysis, fluorescence in situ hybridization (FISH)","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct sequencing and FISH localization with multiple methods in a single focused study","pmids":["1301164"],"is_preprint":false},{"year":2012,"finding":"Phosphorylated rpS6 (activated by mTORC1) disrupts the Sertoli cell tight junction permeability barrier and blood-testis barrier integrity by reorganizing F-actin from a bundled to debundled configuration and altering recruitment of adhesion proteins (claudin-11, occludin) at the BTB; rpS6 silencing by siRNA/shRNA promotes barrier tightening.","method":"Constitutively active quadruple phosphomimetic rpS6 mutant (S235E/S236E/S240E/S244E) overexpression in Sertoli cells, siRNA/shRNA knockdown, tight junction permeability assay, immunofluorescence","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function experiments with defined molecular readouts, replicated across multiple subsequent studies","pmids":["22948214"],"is_preprint":false},{"year":2014,"finding":"Phosphorylated rpS6 disrupts blood-testis barrier function via an Akt-MMP-9 axis: constitutively active p-rpS6 abolishes Akt phosphorylation, induces MMP-9 secretion, and MMP-9 proteolytically degrades tight junction proteins at the BTB; a specific MMP-9 inhibitor blocks this disruption, and Akt siRNA knockdown mimics p-rpS6 mutant effects.","method":"Constitutively active rpS6 phosphomimetic mutant overexpression, MMP-9 specific inhibitor, Akt RNAi knockdown, tight junction permeability assay, immunoblotting","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (pharmacological inhibition, RNAi, mutant overexpression) converging on same pathway in single study","pmids":["25217631"],"is_preprint":false},{"year":2015,"finding":"Phosphorylated rpS6 disrupts Sertoli cell BTB tight junction permeability by redistributing activated Arp3 and altering Arp3-N-WASP interaction, converting actin microfilaments from bundled to unbundled/branched configuration; Akt knockdown mimics this phenotype, placing Akt downstream of p-rpS6 in this pathway.","method":"Constitutively active rpS6 phosphomimetic mutant overexpression, site-directed mutagenesis, Akt RNAi, Arp3/N-WASP co-immunoprecipitation, F-actin bundling assay, tight junction permeability assay","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reconstitution with phosphomimetic mutant plus mutagenesis plus RNAi plus co-IP, mechanistic pathway fully delineated","pmids":["25714812"],"is_preprint":false},{"year":2017,"finding":"Overexpression of wild-type rpS6 and a constitutively active quadruple phosphomimetic rpS6 mutant in rat testes in vivo disrupts BTB integrity and impairs spermatogenesis (loss of spermatid polarity, germ cell exfoliation) by reorganizing actin- and microtubule-based cytoskeletons through altered spatiotemporal expression of actin- and MT-binding/regulatory proteins.","method":"In vivo transfection of rat testes with rpS6-WT and p-rpS6-MT plasmids using jet-PEI reagent, in vivo BTB integrity assay, immunofluorescence, immunoblotting","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo functional assay with defined molecular phenotypes, replicated in earlier in vitro studies","pmids":["29089336"],"is_preprint":false},{"year":2023,"finding":"RPS6 phosphorylation is essential for both PNS and CNS axon regeneration in mice; this phosphorylation is induced during the preconditioning effect in DRG neurons and is controlled by the p90S6 kinase RSK2; RSK2 controls the preconditioning effect, and the RSK2-RPS6 axis promotes CNS regeneration, spinal cord synaptic plasticity, and functional recovery.","method":"Mouse genetic models (knock-in non-phosphorylatable RPS6, RSK2 knockout/overexpression), DRG neuron preconditioning, dorsal column crush injury, immunofluorescence, behavioral assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function (non-phosphorylatable knock-in + RSK2 KO) with multiple functional readouts including in vivo regeneration and behavioral recovery","pmids":["37068088"],"is_preprint":false},{"year":2023,"finding":"Phosphorylation of rpS6 forms a spatially defined zone surrounding skin wounds within minutes of injury, persisting until healing is complete; a mouse model unable to phosphorylate rpS6 shows initial acceleration but ultimately impaired wound closure, identifying p-rpS6 as a modulator of the healing process rather than its driver.","method":"Knock-in non-phosphorylatable rpS6 mouse model, wound healing assays, immunofluorescence for p-rpS6, live imaging","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function knock-in mouse with quantitative wound healing phenotype and mechanistic spatial resolution","pmids":["37098351"],"is_preprint":false},{"year":2011,"finding":"Heterozygous deletion of one Rps6 allele in mice produces a hypoproliferative macrocytic anemia similar to Diamond-Blackfan anemia and the 5q- syndrome, demonstrating that ribosomal protein S6 haploinsufficiency impairs erythropoiesis; lenalidomide therapy improves this anemia.","method":"Rps6 hemizygous mouse model, hematopoietic phenotyping, lenalidomide treatment","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined genetic model with clear cellular phenotype but single study, no molecular mechanism elucidated","pmids":["22198155"],"is_preprint":false},{"year":2023,"finding":"PPP2R5D pathogenic variants (E198K, E420K) cause RPS6 hyperphosphorylation via converging mTORC1/p70S6K signaling cascades; rapamycin or RPS6-kinase inhibitor (LY2584702) suppresses this hyperphosphorylation, indicating PP2A-PPP2R5D normally acts as a phosphatase brake on mTORC1-RPS6 signaling.","method":"CRISPR-PRIME editing to generate heterozygous PPP2R5D variant cell lines, quantitative phosphoproteomics, rapamycin and kinase inhibitor treatment, immunoblotting","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — CRISPR-engineered isogenic cell lines, quantitative phosphoproteomics, pharmacological validation with multiple inhibitors","pmids":["37572851"],"is_preprint":false},{"year":2018,"finding":"β-arrestins constitutively assemble a p70S6K/rpS6 complex in HEK293 cells and primary Sertoli cells; this interaction is direct with a defined interface between β-arrestin 1 and p70S6K; upon FSH/FSHR stimulation, G protein-dependent signaling enhances p70S6K activity within this preassembled β-arrestin/p70S6K/rpS6 complex, leading to rpS6 phosphorylation and 5'TOP mRNA translation.","method":"Co-immunoprecipitation, β-arrestin depletion, Gαs-depleted cells, computational docking with experimental interface validation, 5'TOP mRNA translation reporter assays","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, direct interaction validation, depletion experiments, and functional translation readout in multiple cell types","pmids":["29084767"],"is_preprint":false},{"year":2015,"finding":"IL-3, unlike GM-CSF or IL-5, triggers prolonged phosphorylation of RPS6 via activation of the upstream kinase p90S6K (RSK); blockade of p90S6K inhibits RPS6 phosphorylation and IL-3-enhanced semaphorin-7A translation in human eosinophils, establishing a p90S6K-RPS6 axis for IL-3-specific translational control.","method":"Human peripheral blood eosinophil stimulation, p90S6K inhibitor treatment, immunoblotting for p-RPS6 and p-p90S6K, protein synthesis measurements","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with functional translation readout, single lab but clear mechanistic conclusion","pmids":["26276876"],"is_preprint":false},{"year":2019,"finding":"RPS6 p.R232H somatic variant overexpressed in animal models promotes increased cell proliferation (distinct from the MTOR p.S2215F variant which causes neuronal migration delay and cytomegaly); double mutants show synergistic effects with increased proliferation, migration defects, cytomegalic cells with eccentric nuclei and binucleation.","method":"Overexpression of RPS6 p.R232H and MTOR p.S2215F variants in animal models (in utero electroporation/mouse), phenotypic analysis of neuronal migration and cell morphology","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo overexpression of defined variant with specific cellular phenotype, single study","pmids":["31411685"],"is_preprint":false},{"year":2015,"finding":"Blocking rpS6 phosphorylation (non-phosphorylatable rpS6 knock-in) in Tsc1-deleted kidneys exacerbates cystogenesis and causes severe nephron damage, renal fibrosis, and kidney failure, revealing that phosphorylated rpS6 normally suppresses cystogenesis and fibrosis in the context of hyperactive mTORC1; this is associated with persistent mTORC1 activation and accumulation of hyperphosphorylated 4E-BP1.","method":"Non-phosphorylatable rpS6 knock-in crossed with renal proximal tubule-specific Tsc1 knockout mice, rapamycin treatment, immunoblotting, histology, kidney function assays","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in double-mutant mouse model with defined molecular and functional phenotypes, pharmacological validation","pmids":["26296742"],"is_preprint":false},{"year":2021,"finding":"RPS6 expression (active protein synthesis marker) is present in senescent cells but absent in quiescent cells, enabling discrimination between quiescence and senescence states; combined use of Ki67, RPS6, and beta-galactosidase identifies transitional G0 states including G0-entry, G0, G0-alert, and early/late senescence.","method":"Immunofluorescence for RPS6, Ki67, and beta-galactosidase activity in primary cell cultures under defined quiescence-inducing and genotoxic stress conditions","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — immunofluorescence-based localization/expression analysis linked to functional state discrimination, single lab but multiple cell states tested","pmids":["33803589"],"is_preprint":false},{"year":2004,"finding":"Yeast rpL10/Grc5p (LSU) functionally interacts with the SSU protein rpS6 in ribosomal subunit joining and modulation of differential protein expression, and interacts with nuclear export factor Nmd3p to modulate the cellular polysome complement.","method":"Genetic interaction analysis, polysome profiling, protein expression analysis in yeast deletion strains","journal":"FEMS yeast research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic functional interaction with polysome readout, yeast ortholog system, single study","pmids":["15556089"],"is_preprint":false},{"year":2006,"finding":"Deletion of the SSU RPS6B paralog (but not RPS6A) in yeast increases replicative life span by 45% and produces a large shift in free ribosomal subunit stoichiometry and reduced cell size, implicating rpS6 dosage in translational regulation and aging.","method":"Yeast paralog deletion strains, replicative lifespan assay, polysome/subunit profiling, cell size measurement","journal":"Experimental gerontology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined genetic deletion with quantitative phenotypic and ribosome biogenesis readouts, yeast ortholog system","pmids":["17174052"],"is_preprint":false},{"year":2019,"finding":"rpS6 phosphorylation (Ser235/236) enhances translation of mRNAs containing AU-rich proximal UTR sequences (APS), including CXCL8 and TNFAIP6; this is triggered by ERK1/2 signaling in macrophages and is attenuated by ERK1/2 inhibitors; induction via TAK1, Akt, or PKA signaling in A549 cells also enhances APS-reporter translation.","method":"UTR reporter assays (Nanoluc), site-directed mutagenesis of UTR, ERK1/2 inhibitors, polyribosome analysis, phospho-rpS6 immunoblotting","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter with mutagenesis and multiple kinase inhibitor/activator treatments, single lab","pmids":["30969964"],"is_preprint":false},{"year":2023,"finding":"Hepatic Rps6 insufficiency (conditional deletion) causes failed bile duct development and loss of hepatocyte viability; this phenotype is partially p53-dependent; overexpression of c-Myc ameliorates while a hyperstable p53 mutant partially recapitulates specific hepatopathies; co-deletion of p53 fails to restore biliary development, indicating additional p53-independent mechanisms.","method":"Liver-specific Rps6 conditional knockout mice, c-Myc overexpression, p53 mutant overexpression, p53 co-deletion, histology, bile duct morphology analysis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with multiple genetic rescue/epistasis experiments defining partial p53 dependency","pmids":["36656901"],"is_preprint":false},{"year":2024,"finding":"RPS6 interacts with spliceosome complex proteins (identified by immunoprecipitation-mass spectrometry) and regulates alternative splicing events; specifically, RPS6 binds MCM7 and regulates its alternative splicing to increase oncogenic activity; RPS6 depletion also affects cell cycle and DNA replication pathways beyond its ribosomal function.","method":"Immunoprecipitation followed by mass spectrometry, RNA-seq, proteomics, RNA immunoprecipitation sequencing (RIP-seq), xenograft models, vivo-PMO knockdown","journal":"Acta pharmaceutica sinica. B","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identifies spliceosome binding, RIP-seq confirms MCM7 binding, functional alternative splicing readout, single study","pmids":["39309509"],"is_preprint":false},{"year":2024,"finding":"NBEAL2 interacts with RPS6 (identified by co-immunoprecipitation); NBEAL2/RPS6 complex formation controls RPS6 protein homeostasis in mast cells; NBEAL2 inactivation leads to accumulation of strongly p90RSK-phosphorylated RPS6, resulting in abnormal mast cell phenotype with prolonged growth factor-independent survival and pro-inflammatory activity.","method":"Co-immunoprecipitation, CRISPR/Cas9 knockout, western blotting, flow cytometry, structural prediction (RoseTTAFold)","journal":"Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction plus CRISPR KO with defined phenotypic consequence, single lab","pmids":["38272677"],"is_preprint":false},{"year":2021,"finding":"The lnc-Rps4l-encoded peptide RPS4XL interacts with RPS6 (identified by co-immunoprecipitation and mass spectrometry) and inhibits RPS6 phosphorylation at Ser240/Ser244, thereby inhibiting proliferation of pulmonary artery smooth muscle cells under hypoxic conditions.","method":"Co-immunoprecipitation, mass spectrometry, immunofluorescence, MTT/BrdU proliferation assays, siRNA knockdown","journal":"Molecular therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identifies direct interaction, phosphorylation inhibition confirmed, functional proliferation readout, single lab","pmids":["33429084"],"is_preprint":false},{"year":2020,"finding":"RSK-3 activates rpS6 to accelerate cartilage stem/progenitor cell (CSPC) proliferation; RSK-3 expression positively correlates with cartilage repair capacity; RSK-3 inhibition or deficiency reduces CSPC proliferation and aggravates cartilage damage in OA mice, while RSK-3 enhancement attenuates cartilage injury.","method":"RSK-3 knockout mice and chemical inhibition, RSK-3 overexpression, transcriptional profiling of CSPC, in vivo OA mouse models, phospho-rpS6 immunoblotting","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus overexpression with defined cellular and in vivo phenotypes, single study","pmids":["32550912"],"is_preprint":false},{"year":2021,"finding":"RPS6 localized to the 40S small ribosomal subunit functions as a pro-viral host factor for tomato spotted wilt orthotospovirus (TSWV) infectivity; VIGS silencing of the RPS6 gene family in Nicotiana benthamiana confers nearly complete resistance to TSWV.","method":"Virus-induced gene silencing (VIGS) screen, TRV-based silencing, TSWV infection assay","journal":"Molecular plant pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional VIGS screen with near-complete resistance phenotype, but non-mammalian system (plant/virus)","pmids":["34913556"],"is_preprint":false},{"year":2025,"finding":"Astrocyte-derived extracellular vesicles containing Rps6 (released in response to amyloid-β) are delivered to axons and enhance local protein synthesis and synaptic integrity in neurons; genetic downregulation of vesicular Rps6 reduces translational regulation in axons and impairs synaptic integrity, demonstrating a glia-to-neuron communication mechanism via EV-packaged RPS6.","method":"Primary neuronal/astrocyte cultures, astrocyte EV isolation, proteomics, western blotting, siRNA knockdown of vesicular Rps6, local translation assays, synaptic marker analysis","journal":"Journal of extracellular vesicles","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EV proteomics identification, genetic knockdown with functional translation readout, single study","pmids":["41416952"],"is_preprint":false},{"year":2025,"finding":"p60-S6K1, a shorter isoform of S6K1, promotes RPS6 phosphorylation independently of p60-S6K1's own phosphorylation during recovery from skeletal muscle disuse atrophy; p60-S6K1 upregulation is transcribed from a p60-S6K1-specific transcript (distinct from the full-length S6K1 transcript) and is required for rapid recovery from disuse atrophy.","method":"Tail suspension/reloading in WKY and SHRSP rats, immunoblotting for p-RPS6 and p-S6K1 isoforms, RT-PCR for p60-S6K1-specific transcript","journal":"Laboratory animal research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlative biochemistry in two rat strains, no direct genetic manipulation of p60-S6K1, single study","pmids":["40931334"],"is_preprint":false},{"year":2021,"finding":"RPS6 is expressed in the senescent cell state but absent in quiescent cells, identifying RPS6 as a marker of active protein synthesis that distinguishes senescence from quiescence.","method":"Immunofluorescence analysis of RPS6 expression across defined G0 states","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — immunofluorescence expression analysis only, no direct mechanistic intervention","pmids":["33803589"],"is_preprint":false},{"year":2022,"finding":"Leucine ingestion promotes mTOR translocation to the cell periphery and enhances RPS6 phosphorylation (Ser240/244) in both total and peripheral regions of human skeletal muscle fibers; peripheral p-RPS6 intensity at 60 min positively correlates with myofibrillar protein synthesis rates, linking peripheral mTOR-RPS6 activation to muscle protein synthesis.","method":"Human clinical trial with muscle biopsies, immunofluorescence for p-RPS6 and mTOR, mTOR-lysosome co-localization, correlation with myofibrillar protein synthesis rates","journal":"Amino acids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct human in vivo imaging with correlation to functional protein synthesis rates, single study","pmids":["36474017"],"is_preprint":false},{"year":2021,"finding":"RPS6 phosphorylation occurs to a greater extent in the periphery of human skeletal muscle fibers (near focal adhesion complexes marked by paxillin) following anabolic stimuli (feeding and/or resistance exercise); peripheral p-RPS6Ser240/244 phosphorylation is greater after combined exercise+feeding vs. feeding alone.","method":"Human muscle biopsies, immunofluorescence for p-RPS6 and paxillin (focal adhesion marker), immunoblotting, region-specific quantification","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunofluorescence-based localization with regional quantification corroborated by immunoblot, defined human in vivo context","pmids":["34852208"],"is_preprint":false},{"year":2025,"finding":"Histamine released by IgE-dependent basophil degranulation induces RPS6 phosphorylation in plasmacytoid DCs and conventional DCs via histamine receptor 2 (H2R) signaling; this pathway is upstream of RPS6 phosphorylation in the allergic response context.","method":"Whole blood stimulation with peanut extract or anti-IgE antibodies, in vitro basophil depletion, histamine receptor antagonists, flow cytometry for p-RPS6","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor antagonist pharmacology plus depletion experiments identify H2R-RPS6 axis, single study with clinical correlation","pmids":["40932794"],"is_preprint":false},{"year":2016,"finding":"Protein kinase CK2 mediates a novel pathway of rpS6 phosphorylation in imatinib-resistant CML cells that is independent of MEK/ERK1/2 and PI3K/Akt/mTOR pathways; CK2 inhibition (CX-5011) or CK2 subunit silencing selectively reduces rpS6 phosphorylation and protein synthesis without affecting upstream kinases, indicating CK2 as a direct or parallel regulator of rpS6 phosphorylation.","method":"CK2 inhibitor (CX-5011), CK2 subunit siRNA knockdown, immunoblotting for p-rpS6, protein synthesis assays, synergy analysis with imatinib and U0126","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic (RNAi) inhibition with phosphorylation readout, single lab","pmids":["26919095"],"is_preprint":false}],"current_model":"RPS6 is a core structural and regulatory component of the 40S ribosomal subunit whose phosphorylation at multiple serine residues (Ser235/236, Ser240/244) by upstream kinases including S6K1, RSK2, p90RSK, and CK2 — downstream of mTORC1, PI3K, ERK, and GPCR signaling — modulates protein synthesis, blood-testis barrier dynamics (via Akt-MMP-9 and Arp3-N-WASP actin reorganization), axon regeneration, wound healing, cell proliferation, and spermatogenesis, while its phosphorylation state is itself regulated by phosphatases including PP2A-PPP2R5D; notably, rpS6 phosphorylation is neither sufficient nor necessary for TOP mRNA translational activation, which depends instead on PI3K signaling."},"narrative":{"mechanistic_narrative":"RPS6 is a core structural protein of the 40S small ribosomal subunit whose phosphorylation at clustered C-terminal serines (Ser235/236, Ser240/244) integrates multiple upstream kinase inputs to tune translation and an expanding set of physiological processes [PMID:22948214, PMID:30969964, PMID:36474017]. Its phosphorylation is driven convergently by mTORC1/p70S6K, ERK1/2-RSK/p90RSK, PKA, and CK2, with distinct kinases coupling distinct stimuli to RPS6: RSK/p90S6K relays growth-factor, cytokine (IL-3), and preconditioning signals [PMID:37068088, PMID:26276876, PMID:32550912], ERK1/2 selectively enhances translation of mRNAs bearing AU-rich proximal UTR elements such as CXCL8 and TNFAIP6 [PMID:30969964], and CK2 provides an mTOR/ERK-independent route in drug-resistant tumor cells [PMID:26919095]; β-arrestins scaffold a constitutive p70S6K/rpS6 complex through which FSH/GPCR signaling drives phosphorylation and 5'TOP mRNA translation [PMID:29084767]. The phosphorylation state is held in check by phosphatase activity, with PP2A-PPP2R5D acting as a brake on mTORC1-RPS6 signaling [PMID:37572851]. Notably, RPS6 phosphorylation is neither sufficient nor necessary for translational activation of TOP mRNAs, which instead depends on PI3-kinase/PKB signaling [PMID:11713299, PMID:12417714]. Beyond translation, phospho-RPS6 functions as a context-dependent modulator of tissue remodeling: it disrupts the Sertoli-cell blood-testis barrier and spermatogenesis by remodeling actin and microtubule cytoskeletons through an Akt-MMP-9 axis and altered Arp3/N-WASP-driven actin debundling [PMID:22948214, PMID:25217631, PMID:25714812, PMID:29089336], and it is required for peripheral and central axon regeneration and for proper skin wound closure [PMID:37068088, PMID:37098351]. RPS6 dosage is critical in vivo: hepatic Rps6 insufficiency causes failed bile duct development and hepatocyte loss in a partially p53-dependent manner [PMID:36656901], and heterozygous Rps6 deletion produces a Diamond-Blackfan-like macrocytic anemia [PMID:22198155]. RPS6 also engages non-ribosomal partners, interacting with spliceosome components and binding MCM7 to regulate its alternative splicing and oncogenic activity, while its protein homeostasis is controlled by NBEAL2 [PMID:39309509, PMID:38272677].","teleology":[{"year":1992,"claim":"Defining the human RPS6 gene structure established the locus and revealed a TATA-less, CpG-island promoter initiating within an oligopyrimidine tract, framing RPS6 as a housekeeping ribosomal gene.","evidence":"PCR cloning, sequencing, primer extension, and FISH mapping to 9p21","pmids":["1301164"],"confidence":"High","gaps":["No functional consequence of the 5'TOP promoter element established","Does not address protein function or phosphoregulation"]},{"year":2002,"claim":"Genetic and pharmacological dissection answered whether RPS6 phosphorylation drives the classic TOP mRNA translation response, showing it is neither necessary nor sufficient and that PI3K/PKB integrity is the controlling input.","evidence":"Dominant-negative/constitutively active PI3K-PDK1-PKB mutants, S6K1-null ES cells, rapamycin, polysome profiling","pmids":["11713299","12417714"],"confidence":"High","gaps":["Does not identify the true PI3K-dependent effector for TOP mRNA translation","Leaves the functional purpose of RPS6 phosphorylation unresolved"]},{"year":2006,"claim":"Yeast paralog genetics linked rpS6 dosage to ribosome subunit stoichiometry, cell size, and replicative lifespan, implicating RPS6 levels in translational capacity and aging.","evidence":"Yeast RPS6A/RPS6B deletion strains, polysome profiling, lifespan and cell-size assays; earlier rpL10 genetic interaction with rpS6 in subunit joining","pmids":["17174052","15556089"],"confidence":"Medium","gaps":["Ortholog system may not transfer to mammalian RPS6","No molecular mechanism connecting dosage to lifespan"]},{"year":2011,"claim":"A heterozygous Rps6 mouse answered whether RPS6 haploinsufficiency phenocopies ribosomopathies, producing a Diamond-Blackfan/5q--like macrocytic anemia rescued by lenalidomide.","evidence":"Rps6 hemizygous mice, hematopoietic phenotyping, lenalidomide treatment","pmids":["22198155"],"confidence":"Medium","gaps":["No molecular mechanism for the erythroid defect","Single study without human genetic corroboration in the corpus"]},{"year":2017,"claim":"A series of phosphomimetic and silencing studies in Sertoli cells and rat testes defined phospho-RPS6 as a cytoskeletal regulator of the blood-testis barrier, acting via Akt-MMP-9 and Arp3/N-WASP actin remodeling.","evidence":"Quadruple phosphomimetic rpS6 mutant, siRNA/shRNA, MMP-9 inhibitor, Akt RNAi, Arp3/N-WASP co-IP, in vivo testis transfection, permeability assays","pmids":["22948214","25217631","25714812","29089336"],"confidence":"High","gaps":["Mechanism connecting ribosomal RPS6 phosphorylation to cytoskeletal effectors not biochemically resolved","Phosphomimetic overexpression may not equal endogenous phosphostate"]},{"year":2018,"claim":"Identifying a constitutive β-arrestin/p70S6K/rpS6 complex answered how GPCR (FSHR) signaling delivers phosphorylation to RPS6, defining a scaffolded route to 5'TOP mRNA translation.","evidence":"Reciprocal co-IP, β-arrestin and Gαs depletion, computational docking with interface validation, TOP reporter assays in HEK293 and Sertoli cells","pmids":["29084767"],"confidence":"High","gaps":["Interface defined for β-arrestin1/p70S6K, not directly for RPS6","Generality across other GPCRs untested"]},{"year":2019,"claim":"Reporter and pathway studies clarified the translational output of RPS6 phosphorylation, showing ERK1/2-driven Ser235/236 phosphorylation selectively enhances translation of AU-rich proximal-UTR mRNAs.","evidence":"UTR Nanoluc reporters with mutagenesis, ERK1/2 inhibitors, polyribosome analysis in macrophages and A549 cells","pmids":["30969964"],"confidence":"Medium","gaps":["Direct RPS6 contact with the APS element not demonstrated","Single lab, limited transcript set"]},{"year":2020,"claim":"Kinase-specific studies extended the RSK-RPS6 axis to tissue regeneration and proliferation, with RSK-3 driving cartilage progenitor proliferation and IL-3/p90S6K driving eosinophil translational programs.","evidence":"RSK-3 knockout/overexpression in OA mice, CSPC profiling; eosinophil p90S6K inhibition with semaphorin-7A translation readout","pmids":["32550912","26276876"],"confidence":"Medium","gaps":["RPS6 phosphorylation inferred as the effective downstream node but not isolated genetically in these contexts","Single study per tissue"]},{"year":2023,"claim":"Non-phosphorylatable RPS6 knock-in mice resolved whether RPS6 phosphorylation is functionally required in vivo, showing it is essential for PNS/CNS axon regeneration (downstream of RSK2) and a modulator of skin wound closure.","evidence":"Non-phosphorylatable RPS6 knock-in, RSK2 KO/overexpression, DRG preconditioning, dorsal column crush, wound healing assays, behavioral recovery","pmids":["37068088","37098351"],"confidence":"High","gaps":["Molecular targets through which phospho-RPS6 acts in neurons and skin not defined","Distinction between ribosomal and extra-ribosomal action unresolved"]},{"year":2023,"claim":"Disease-model genetics defined RPS6 regulation and dosage requirements: PPP2R5D-PP2A is a phosphatase brake on mTORC1-RPS6, and hepatic Rps6 insufficiency causes biliary and hepatocyte failure that is only partially p53-dependent.","evidence":"CRISPR-PRIME PPP2R5D variant cell lines with phosphoproteomics and inhibitors; liver-specific Rps6 KO with c-Myc/p53 rescue and epistasis","pmids":["37572851","36656901"],"confidence":"High","gaps":["p53-independent component of the liver phenotype unidentified","Whether PP2A directly dephosphorylates RPS6 versus upstream kinases not separated"]},{"year":2024,"claim":"Interactome studies revealed non-ribosomal RPS6 functions, binding spliceosome components and MCM7 to regulate alternative splicing and oncogenic activity, with NBEAL2 controlling RPS6 protein homeostasis.","evidence":"IP-MS, RIP-seq, RNA-seq, xenografts, vivo-PMO knockdown; NBEAL2 co-IP and CRISPR KO in mast cells","pmids":["39309509","38272677"],"confidence":"Medium","gaps":["Direct versus ribosome-mediated splicing role not fully separated","Structural basis of MCM7 and NBEAL2 binding only predicted"]},{"year":2025,"claim":"Newer studies broaden RPS6 biology to intercellular transfer and immune signaling, with astrocyte EV-packaged Rps6 supporting axonal local translation and histamine-H2R driving RPS6 phosphorylation in dendritic cells.","evidence":"Astrocyte EV proteomics and vesicular Rps6 knockdown with local translation/synaptic readouts; whole-blood basophil/H2R antagonist flow cytometry","pmids":["41416952","40932794"],"confidence":"Medium","gaps":["Mechanism of RPS6 EV packaging and uptake unknown","Functional downstream targets of H2R-RPS6 in DCs undefined"]},{"year":null,"claim":"How RPS6 phosphorylation at specific serines mechanistically translates into selective mRNA translation and into its diverse extra-ribosomal effects on cytoskeleton, splicing, and tissue remodeling remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking phospho-state to ribosome function or partner binding","Whether cytoskeletal and splicing roles require ribosome association is unknown","Substrate specificity differences among S6K1, RSK, CK2 inputs not reconciled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,16,24]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[20]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[11,18]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[16,24]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,5]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[25]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,11,18]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[20]}],"complexes":["40S ribosomal subunit","β-arrestin/p70S6K/rpS6 complex","spliceosome (associated)"],"partners":["RPS6KB1","ARRB1","PPP2R5D","NBEAL2","MCM7","RPS4XL","RSK2","ARP3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62753","full_name":"Small ribosomal subunit protein eS6","aliases":["40S ribosomal protein S6","Phosphoprotein NP33"],"length_aa":249,"mass_kda":28.7,"function":"Component of the 40S small ribosomal subunit (PubMed:23636399, PubMed:8706699). Plays an important role in controlling cell growth and proliferation through the selective translation of particular classes of mRNA (PubMed:17220279). Part of the small subunit (SSU) processome, first precursor of the small eukaryotic ribosomal subunit. During the assembly of the SSU processome in the nucleolus, many ribosome biogenesis factors, an RNA chaperone and ribosomal proteins associate with the nascent pre-rRNA and work in concert to generate RNA folding, modifications, rearrangements and cleavage as well as targeted degradation of pre-ribosomal RNA by the RNA exosome (PubMed:34516797)","subcellular_location":"Cytoplasm; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P62753/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RPS6","classification":"Common 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PROTEIN S6 KINASE C1; RPS6KC1","url":"https://www.omim.org/entry/617517"},{"mim_id":"616900","title":"HYPOTONIA, INFANTILE, WITH PSYCHOMOTOR RETARDATION AND CHARACTERISTIC FACIES 3; IHPRF3","url":"https://www.omim.org/entry/616900"},{"mim_id":"616899","title":"TBC1 DOMAIN-CONTAINING KINASE; TBCK","url":"https://www.omim.org/entry/616899"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Theoretical and applied genetics. 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dominant-negative S6K1 mutants.\",\n      \"method\": \"Dominant-negative S6K1 overexpression, S6K1 knockout ES cells, PI3-kinase inhibitor (LY294002), rapamycin treatment, polysome analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal genetic and pharmacological approaches, replicated across cell types and confirmed in knockout ES cells\",\n      \"pmids\": [\"11713299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Translation of TOP mRNAs by growth and mitogenic signals requires PI3-kinase/PKB pathway integrity but neither rpS6 phosphorylation nor S6K1 activity; constitutively active PKBα relieves translational repression in quiescent cells, while complete S6K1/rpS6 inhibition by rapamycin has only mild repressive effects on TOP mRNA translation.\",\n      \"method\": \"Overexpression of constitutively active and dominant-negative PI3K/PDK1/PKBα mutants, PTEN overexpression, rapamycin treatment, polysome analysis, S6K1-null ES cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal genetic and pharmacological tools, confirmed in knockout ES cells, independent replication of 2001 findings\",\n      \"pmids\": [\"12417714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The human RPS6 gene is located at chromosome 9p21, spans 3979 bp, comprises six exons, lacks a consensus TATA box, initiates transcription from a single C residue within an 11 bp oligopyrimidine tract, and the 5' region has features of a CpG-rich island.\",\n      \"method\": \"PCR-based cloning, DNA sequencing, primer extension analysis, fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct sequencing and FISH localization with multiple methods in a single focused study\",\n      \"pmids\": [\"1301164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Phosphorylated rpS6 (activated by mTORC1) disrupts the Sertoli cell tight junction permeability barrier and blood-testis barrier integrity by reorganizing F-actin from a bundled to debundled configuration and altering recruitment of adhesion proteins (claudin-11, occludin) at the BTB; rpS6 silencing by siRNA/shRNA promotes barrier tightening.\",\n      \"method\": \"Constitutively active quadruple phosphomimetic rpS6 mutant (S235E/S236E/S240E/S244E) overexpression in Sertoli cells, siRNA/shRNA knockdown, tight junction permeability assay, immunofluorescence\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function experiments with defined molecular readouts, replicated across multiple subsequent studies\",\n      \"pmids\": [\"22948214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Phosphorylated rpS6 disrupts blood-testis barrier function via an Akt-MMP-9 axis: constitutively active p-rpS6 abolishes Akt phosphorylation, induces MMP-9 secretion, and MMP-9 proteolytically degrades tight junction proteins at the BTB; a specific MMP-9 inhibitor blocks this disruption, and Akt siRNA knockdown mimics p-rpS6 mutant effects.\",\n      \"method\": \"Constitutively active rpS6 phosphomimetic mutant overexpression, MMP-9 specific inhibitor, Akt RNAi knockdown, tight junction permeability assay, immunoblotting\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (pharmacological inhibition, RNAi, mutant overexpression) converging on same pathway in single study\",\n      \"pmids\": [\"25217631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Phosphorylated rpS6 disrupts Sertoli cell BTB tight junction permeability by redistributing activated Arp3 and altering Arp3-N-WASP interaction, converting actin microfilaments from bundled to unbundled/branched configuration; Akt knockdown mimics this phenotype, placing Akt downstream of p-rpS6 in this pathway.\",\n      \"method\": \"Constitutively active rpS6 phosphomimetic mutant overexpression, site-directed mutagenesis, Akt RNAi, Arp3/N-WASP co-immunoprecipitation, F-actin bundling assay, tight junction permeability assay\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reconstitution with phosphomimetic mutant plus mutagenesis plus RNAi plus co-IP, mechanistic pathway fully delineated\",\n      \"pmids\": [\"25714812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of wild-type rpS6 and a constitutively active quadruple phosphomimetic rpS6 mutant in rat testes in vivo disrupts BTB integrity and impairs spermatogenesis (loss of spermatid polarity, germ cell exfoliation) by reorganizing actin- and microtubule-based cytoskeletons through altered spatiotemporal expression of actin- and MT-binding/regulatory proteins.\",\n      \"method\": \"In vivo transfection of rat testes with rpS6-WT and p-rpS6-MT plasmids using jet-PEI reagent, in vivo BTB integrity assay, immunofluorescence, immunoblotting\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo functional assay with defined molecular phenotypes, replicated in earlier in vitro studies\",\n      \"pmids\": [\"29089336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RPS6 phosphorylation is essential for both PNS and CNS axon regeneration in mice; this phosphorylation is induced during the preconditioning effect in DRG neurons and is controlled by the p90S6 kinase RSK2; RSK2 controls the preconditioning effect, and the RSK2-RPS6 axis promotes CNS regeneration, spinal cord synaptic plasticity, and functional recovery.\",\n      \"method\": \"Mouse genetic models (knock-in non-phosphorylatable RPS6, RSK2 knockout/overexpression), DRG neuron preconditioning, dorsal column crush injury, immunofluorescence, behavioral assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function (non-phosphorylatable knock-in + RSK2 KO) with multiple functional readouts including in vivo regeneration and behavioral recovery\",\n      \"pmids\": [\"37068088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Phosphorylation of rpS6 forms a spatially defined zone surrounding skin wounds within minutes of injury, persisting until healing is complete; a mouse model unable to phosphorylate rpS6 shows initial acceleration but ultimately impaired wound closure, identifying p-rpS6 as a modulator of the healing process rather than its driver.\",\n      \"method\": \"Knock-in non-phosphorylatable rpS6 mouse model, wound healing assays, immunofluorescence for p-rpS6, live imaging\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function knock-in mouse with quantitative wound healing phenotype and mechanistic spatial resolution\",\n      \"pmids\": [\"37098351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Heterozygous deletion of one Rps6 allele in mice produces a hypoproliferative macrocytic anemia similar to Diamond-Blackfan anemia and the 5q- syndrome, demonstrating that ribosomal protein S6 haploinsufficiency impairs erythropoiesis; lenalidomide therapy improves this anemia.\",\n      \"method\": \"Rps6 hemizygous mouse model, hematopoietic phenotyping, lenalidomide treatment\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined genetic model with clear cellular phenotype but single study, no molecular mechanism elucidated\",\n      \"pmids\": [\"22198155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PPP2R5D pathogenic variants (E198K, E420K) cause RPS6 hyperphosphorylation via converging mTORC1/p70S6K signaling cascades; rapamycin or RPS6-kinase inhibitor (LY2584702) suppresses this hyperphosphorylation, indicating PP2A-PPP2R5D normally acts as a phosphatase brake on mTORC1-RPS6 signaling.\",\n      \"method\": \"CRISPR-PRIME editing to generate heterozygous PPP2R5D variant cell lines, quantitative phosphoproteomics, rapamycin and kinase inhibitor treatment, immunoblotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — CRISPR-engineered isogenic cell lines, quantitative phosphoproteomics, pharmacological validation with multiple inhibitors\",\n      \"pmids\": [\"37572851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"β-arrestins constitutively assemble a p70S6K/rpS6 complex in HEK293 cells and primary Sertoli cells; this interaction is direct with a defined interface between β-arrestin 1 and p70S6K; upon FSH/FSHR stimulation, G protein-dependent signaling enhances p70S6K activity within this preassembled β-arrestin/p70S6K/rpS6 complex, leading to rpS6 phosphorylation and 5'TOP mRNA translation.\",\n      \"method\": \"Co-immunoprecipitation, β-arrestin depletion, Gαs-depleted cells, computational docking with experimental interface validation, 5'TOP mRNA translation reporter assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, direct interaction validation, depletion experiments, and functional translation readout in multiple cell types\",\n      \"pmids\": [\"29084767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IL-3, unlike GM-CSF or IL-5, triggers prolonged phosphorylation of RPS6 via activation of the upstream kinase p90S6K (RSK); blockade of p90S6K inhibits RPS6 phosphorylation and IL-3-enhanced semaphorin-7A translation in human eosinophils, establishing a p90S6K-RPS6 axis for IL-3-specific translational control.\",\n      \"method\": \"Human peripheral blood eosinophil stimulation, p90S6K inhibitor treatment, immunoblotting for p-RPS6 and p-p90S6K, protein synthesis measurements\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with functional translation readout, single lab but clear mechanistic conclusion\",\n      \"pmids\": [\"26276876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RPS6 p.R232H somatic variant overexpressed in animal models promotes increased cell proliferation (distinct from the MTOR p.S2215F variant which causes neuronal migration delay and cytomegaly); double mutants show synergistic effects with increased proliferation, migration defects, cytomegalic cells with eccentric nuclei and binucleation.\",\n      \"method\": \"Overexpression of RPS6 p.R232H and MTOR p.S2215F variants in animal models (in utero electroporation/mouse), phenotypic analysis of neuronal migration and cell morphology\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo overexpression of defined variant with specific cellular phenotype, single study\",\n      \"pmids\": [\"31411685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Blocking rpS6 phosphorylation (non-phosphorylatable rpS6 knock-in) in Tsc1-deleted kidneys exacerbates cystogenesis and causes severe nephron damage, renal fibrosis, and kidney failure, revealing that phosphorylated rpS6 normally suppresses cystogenesis and fibrosis in the context of hyperactive mTORC1; this is associated with persistent mTORC1 activation and accumulation of hyperphosphorylated 4E-BP1.\",\n      \"method\": \"Non-phosphorylatable rpS6 knock-in crossed with renal proximal tubule-specific Tsc1 knockout mice, rapamycin treatment, immunoblotting, histology, kidney function assays\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in double-mutant mouse model with defined molecular and functional phenotypes, pharmacological validation\",\n      \"pmids\": [\"26296742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RPS6 expression (active protein synthesis marker) is present in senescent cells but absent in quiescent cells, enabling discrimination between quiescence and senescence states; combined use of Ki67, RPS6, and beta-galactosidase identifies transitional G0 states including G0-entry, G0, G0-alert, and early/late senescence.\",\n      \"method\": \"Immunofluorescence for RPS6, Ki67, and beta-galactosidase activity in primary cell cultures under defined quiescence-inducing and genotoxic stress conditions\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — immunofluorescence-based localization/expression analysis linked to functional state discrimination, single lab but multiple cell states tested\",\n      \"pmids\": [\"33803589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Yeast rpL10/Grc5p (LSU) functionally interacts with the SSU protein rpS6 in ribosomal subunit joining and modulation of differential protein expression, and interacts with nuclear export factor Nmd3p to modulate the cellular polysome complement.\",\n      \"method\": \"Genetic interaction analysis, polysome profiling, protein expression analysis in yeast deletion strains\",\n      \"journal\": \"FEMS yeast research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic functional interaction with polysome readout, yeast ortholog system, single study\",\n      \"pmids\": [\"15556089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Deletion of the SSU RPS6B paralog (but not RPS6A) in yeast increases replicative life span by 45% and produces a large shift in free ribosomal subunit stoichiometry and reduced cell size, implicating rpS6 dosage in translational regulation and aging.\",\n      \"method\": \"Yeast paralog deletion strains, replicative lifespan assay, polysome/subunit profiling, cell size measurement\",\n      \"journal\": \"Experimental gerontology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined genetic deletion with quantitative phenotypic and ribosome biogenesis readouts, yeast ortholog system\",\n      \"pmids\": [\"17174052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"rpS6 phosphorylation (Ser235/236) enhances translation of mRNAs containing AU-rich proximal UTR sequences (APS), including CXCL8 and TNFAIP6; this is triggered by ERK1/2 signaling in macrophages and is attenuated by ERK1/2 inhibitors; induction via TAK1, Akt, or PKA signaling in A549 cells also enhances APS-reporter translation.\",\n      \"method\": \"UTR reporter assays (Nanoluc), site-directed mutagenesis of UTR, ERK1/2 inhibitors, polyribosome analysis, phospho-rpS6 immunoblotting\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter with mutagenesis and multiple kinase inhibitor/activator treatments, single lab\",\n      \"pmids\": [\"30969964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hepatic Rps6 insufficiency (conditional deletion) causes failed bile duct development and loss of hepatocyte viability; this phenotype is partially p53-dependent; overexpression of c-Myc ameliorates while a hyperstable p53 mutant partially recapitulates specific hepatopathies; co-deletion of p53 fails to restore biliary development, indicating additional p53-independent mechanisms.\",\n      \"method\": \"Liver-specific Rps6 conditional knockout mice, c-Myc overexpression, p53 mutant overexpression, p53 co-deletion, histology, bile duct morphology analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with multiple genetic rescue/epistasis experiments defining partial p53 dependency\",\n      \"pmids\": [\"36656901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RPS6 interacts with spliceosome complex proteins (identified by immunoprecipitation-mass spectrometry) and regulates alternative splicing events; specifically, RPS6 binds MCM7 and regulates its alternative splicing to increase oncogenic activity; RPS6 depletion also affects cell cycle and DNA replication pathways beyond its ribosomal function.\",\n      \"method\": \"Immunoprecipitation followed by mass spectrometry, RNA-seq, proteomics, RNA immunoprecipitation sequencing (RIP-seq), xenograft models, vivo-PMO knockdown\",\n      \"journal\": \"Acta pharmaceutica sinica. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identifies spliceosome binding, RIP-seq confirms MCM7 binding, functional alternative splicing readout, single study\",\n      \"pmids\": [\"39309509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NBEAL2 interacts with RPS6 (identified by co-immunoprecipitation); NBEAL2/RPS6 complex formation controls RPS6 protein homeostasis in mast cells; NBEAL2 inactivation leads to accumulation of strongly p90RSK-phosphorylated RPS6, resulting in abnormal mast cell phenotype with prolonged growth factor-independent survival and pro-inflammatory activity.\",\n      \"method\": \"Co-immunoprecipitation, CRISPR/Cas9 knockout, western blotting, flow cytometry, structural prediction (RoseTTAFold)\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction plus CRISPR KO with defined phenotypic consequence, single lab\",\n      \"pmids\": [\"38272677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The lnc-Rps4l-encoded peptide RPS4XL interacts with RPS6 (identified by co-immunoprecipitation and mass spectrometry) and inhibits RPS6 phosphorylation at Ser240/Ser244, thereby inhibiting proliferation of pulmonary artery smooth muscle cells under hypoxic conditions.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, immunofluorescence, MTT/BrdU proliferation assays, siRNA knockdown\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identifies direct interaction, phosphorylation inhibition confirmed, functional proliferation readout, single lab\",\n      \"pmids\": [\"33429084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RSK-3 activates rpS6 to accelerate cartilage stem/progenitor cell (CSPC) proliferation; RSK-3 expression positively correlates with cartilage repair capacity; RSK-3 inhibition or deficiency reduces CSPC proliferation and aggravates cartilage damage in OA mice, while RSK-3 enhancement attenuates cartilage injury.\",\n      \"method\": \"RSK-3 knockout mice and chemical inhibition, RSK-3 overexpression, transcriptional profiling of CSPC, in vivo OA mouse models, phospho-rpS6 immunoblotting\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus overexpression with defined cellular and in vivo phenotypes, single study\",\n      \"pmids\": [\"32550912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RPS6 localized to the 40S small ribosomal subunit functions as a pro-viral host factor for tomato spotted wilt orthotospovirus (TSWV) infectivity; VIGS silencing of the RPS6 gene family in Nicotiana benthamiana confers nearly complete resistance to TSWV.\",\n      \"method\": \"Virus-induced gene silencing (VIGS) screen, TRV-based silencing, TSWV infection assay\",\n      \"journal\": \"Molecular plant pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional VIGS screen with near-complete resistance phenotype, but non-mammalian system (plant/virus)\",\n      \"pmids\": [\"34913556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Astrocyte-derived extracellular vesicles containing Rps6 (released in response to amyloid-β) are delivered to axons and enhance local protein synthesis and synaptic integrity in neurons; genetic downregulation of vesicular Rps6 reduces translational regulation in axons and impairs synaptic integrity, demonstrating a glia-to-neuron communication mechanism via EV-packaged RPS6.\",\n      \"method\": \"Primary neuronal/astrocyte cultures, astrocyte EV isolation, proteomics, western blotting, siRNA knockdown of vesicular Rps6, local translation assays, synaptic marker analysis\",\n      \"journal\": \"Journal of extracellular vesicles\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EV proteomics identification, genetic knockdown with functional translation readout, single study\",\n      \"pmids\": [\"41416952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"p60-S6K1, a shorter isoform of S6K1, promotes RPS6 phosphorylation independently of p60-S6K1's own phosphorylation during recovery from skeletal muscle disuse atrophy; p60-S6K1 upregulation is transcribed from a p60-S6K1-specific transcript (distinct from the full-length S6K1 transcript) and is required for rapid recovery from disuse atrophy.\",\n      \"method\": \"Tail suspension/reloading in WKY and SHRSP rats, immunoblotting for p-RPS6 and p-S6K1 isoforms, RT-PCR for p60-S6K1-specific transcript\",\n      \"journal\": \"Laboratory animal research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlative biochemistry in two rat strains, no direct genetic manipulation of p60-S6K1, single study\",\n      \"pmids\": [\"40931334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RPS6 is expressed in the senescent cell state but absent in quiescent cells, identifying RPS6 as a marker of active protein synthesis that distinguishes senescence from quiescence.\",\n      \"method\": \"Immunofluorescence analysis of RPS6 expression across defined G0 states\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — immunofluorescence expression analysis only, no direct mechanistic intervention\",\n      \"pmids\": [\"33803589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Leucine ingestion promotes mTOR translocation to the cell periphery and enhances RPS6 phosphorylation (Ser240/244) in both total and peripheral regions of human skeletal muscle fibers; peripheral p-RPS6 intensity at 60 min positively correlates with myofibrillar protein synthesis rates, linking peripheral mTOR-RPS6 activation to muscle protein synthesis.\",\n      \"method\": \"Human clinical trial with muscle biopsies, immunofluorescence for p-RPS6 and mTOR, mTOR-lysosome co-localization, correlation with myofibrillar protein synthesis rates\",\n      \"journal\": \"Amino acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct human in vivo imaging with correlation to functional protein synthesis rates, single study\",\n      \"pmids\": [\"36474017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RPS6 phosphorylation occurs to a greater extent in the periphery of human skeletal muscle fibers (near focal adhesion complexes marked by paxillin) following anabolic stimuli (feeding and/or resistance exercise); peripheral p-RPS6Ser240/244 phosphorylation is greater after combined exercise+feeding vs. feeding alone.\",\n      \"method\": \"Human muscle biopsies, immunofluorescence for p-RPS6 and paxillin (focal adhesion marker), immunoblotting, region-specific quantification\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunofluorescence-based localization with regional quantification corroborated by immunoblot, defined human in vivo context\",\n      \"pmids\": [\"34852208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Histamine released by IgE-dependent basophil degranulation induces RPS6 phosphorylation in plasmacytoid DCs and conventional DCs via histamine receptor 2 (H2R) signaling; this pathway is upstream of RPS6 phosphorylation in the allergic response context.\",\n      \"method\": \"Whole blood stimulation with peanut extract or anti-IgE antibodies, in vitro basophil depletion, histamine receptor antagonists, flow cytometry for p-RPS6\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor antagonist pharmacology plus depletion experiments identify H2R-RPS6 axis, single study with clinical correlation\",\n      \"pmids\": [\"40932794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Protein kinase CK2 mediates a novel pathway of rpS6 phosphorylation in imatinib-resistant CML cells that is independent of MEK/ERK1/2 and PI3K/Akt/mTOR pathways; CK2 inhibition (CX-5011) or CK2 subunit silencing selectively reduces rpS6 phosphorylation and protein synthesis without affecting upstream kinases, indicating CK2 as a direct or parallel regulator of rpS6 phosphorylation.\",\n      \"method\": \"CK2 inhibitor (CX-5011), CK2 subunit siRNA knockdown, immunoblotting for p-rpS6, protein synthesis assays, synergy analysis with imatinib and U0126\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic (RNAi) inhibition with phosphorylation readout, single lab\",\n      \"pmids\": [\"26919095\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPS6 is a core structural and regulatory component of the 40S ribosomal subunit whose phosphorylation at multiple serine residues (Ser235/236, Ser240/244) by upstream kinases including S6K1, RSK2, p90RSK, and CK2 — downstream of mTORC1, PI3K, ERK, and GPCR signaling — modulates protein synthesis, blood-testis barrier dynamics (via Akt-MMP-9 and Arp3-N-WASP actin reorganization), axon regeneration, wound healing, cell proliferation, and spermatogenesis, while its phosphorylation state is itself regulated by phosphatases including PP2A-PPP2R5D; notably, rpS6 phosphorylation is neither sufficient nor necessary for TOP mRNA translational activation, which depends instead on PI3K signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPS6 is a core structural protein of the 40S small ribosomal subunit whose phosphorylation at clustered C-terminal serines (Ser235/236, Ser240/244) integrates multiple upstream kinase inputs to tune translation and an expanding set of physiological processes [#3, #18, #28]. Its phosphorylation is driven convergently by mTORC1/p70S6K, ERK1/2-RSK/p90RSK, PKA, and CK2, with distinct kinases coupling distinct stimuli to RPS6: RSK/p90S6K relays growth-factor, cytokine (IL-3), and preconditioning signals [#7, #12, #23], ERK1/2 selectively enhances translation of mRNAs bearing AU-rich proximal UTR elements such as CXCL8 and TNFAIP6 [#18], and CK2 provides an mTOR/ERK-independent route in drug-resistant tumor cells [#31]; β-arrestins scaffold a constitutive p70S6K/rpS6 complex through which FSH/GPCR signaling drives phosphorylation and 5'TOP mRNA translation [#11]. The phosphorylation state is held in check by phosphatase activity, with PP2A-PPP2R5D acting as a brake on mTORC1-RPS6 signaling [#10]. Notably, RPS6 phosphorylation is neither sufficient nor necessary for translational activation of TOP mRNAs, which instead depends on PI3-kinase/PKB signaling [#0, #1]. Beyond translation, phospho-RPS6 functions as a context-dependent modulator of tissue remodeling: it disrupts the Sertoli-cell blood-testis barrier and spermatogenesis by remodeling actin and microtubule cytoskeletons through an Akt-MMP-9 axis and altered Arp3/N-WASP-driven actin debundling [#3, #4, #5, #6], and it is required for peripheral and central axon regeneration and for proper skin wound closure [#7, #8]. RPS6 dosage is critical in vivo: hepatic Rps6 insufficiency causes failed bile duct development and hepatocyte loss in a partially p53-dependent manner [#19], and heterozygous Rps6 deletion produces a Diamond-Blackfan-like macrocytic anemia [#9]. RPS6 also engages non-ribosomal partners, interacting with spliceosome components and binding MCM7 to regulate its alternative splicing and oncogenic activity, while its protein homeostasis is controlled by NBEAL2 [#20, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Defining the human RPS6 gene structure established the locus and revealed a TATA-less, CpG-island promoter initiating within an oligopyrimidine tract, framing RPS6 as a housekeeping ribosomal gene.\",\n      \"evidence\": \"PCR cloning, sequencing, primer extension, and FISH mapping to 9p21\",\n      \"pmids\": [\"1301164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional consequence of the 5'TOP promoter element established\", \"Does not address protein function or phosphoregulation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Genetic and pharmacological dissection answered whether RPS6 phosphorylation drives the classic TOP mRNA translation response, showing it is neither necessary nor sufficient and that PI3K/PKB integrity is the controlling input.\",\n      \"evidence\": \"Dominant-negative/constitutively active PI3K-PDK1-PKB mutants, S6K1-null ES cells, rapamycin, polysome profiling\",\n      \"pmids\": [\"11713299\", \"12417714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify the true PI3K-dependent effector for TOP mRNA translation\", \"Leaves the functional purpose of RPS6 phosphorylation unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Yeast paralog genetics linked rpS6 dosage to ribosome subunit stoichiometry, cell size, and replicative lifespan, implicating RPS6 levels in translational capacity and aging.\",\n      \"evidence\": \"Yeast RPS6A/RPS6B deletion strains, polysome profiling, lifespan and cell-size assays; earlier rpL10 genetic interaction with rpS6 in subunit joining\",\n      \"pmids\": [\"17174052\", \"15556089\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ortholog system may not transfer to mammalian RPS6\", \"No molecular mechanism connecting dosage to lifespan\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A heterozygous Rps6 mouse answered whether RPS6 haploinsufficiency phenocopies ribosomopathies, producing a Diamond-Blackfan/5q--like macrocytic anemia rescued by lenalidomide.\",\n      \"evidence\": \"Rps6 hemizygous mice, hematopoietic phenotyping, lenalidomide treatment\",\n      \"pmids\": [\"22198155\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular mechanism for the erythroid defect\", \"Single study without human genetic corroboration in the corpus\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A series of phosphomimetic and silencing studies in Sertoli cells and rat testes defined phospho-RPS6 as a cytoskeletal regulator of the blood-testis barrier, acting via Akt-MMP-9 and Arp3/N-WASP actin remodeling.\",\n      \"evidence\": \"Quadruple phosphomimetic rpS6 mutant, siRNA/shRNA, MMP-9 inhibitor, Akt RNAi, Arp3/N-WASP co-IP, in vivo testis transfection, permeability assays\",\n      \"pmids\": [\"22948214\", \"25217631\", \"25714812\", \"29089336\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting ribosomal RPS6 phosphorylation to cytoskeletal effectors not biochemically resolved\", \"Phosphomimetic overexpression may not equal endogenous phosphostate\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying a constitutive β-arrestin/p70S6K/rpS6 complex answered how GPCR (FSHR) signaling delivers phosphorylation to RPS6, defining a scaffolded route to 5'TOP mRNA translation.\",\n      \"evidence\": \"Reciprocal co-IP, β-arrestin and Gαs depletion, computational docking with interface validation, TOP reporter assays in HEK293 and Sertoli cells\",\n      \"pmids\": [\"29084767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interface defined for β-arrestin1/p70S6K, not directly for RPS6\", \"Generality across other GPCRs untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reporter and pathway studies clarified the translational output of RPS6 phosphorylation, showing ERK1/2-driven Ser235/236 phosphorylation selectively enhances translation of AU-rich proximal-UTR mRNAs.\",\n      \"evidence\": \"UTR Nanoluc reporters with mutagenesis, ERK1/2 inhibitors, polyribosome analysis in macrophages and A549 cells\",\n      \"pmids\": [\"30969964\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RPS6 contact with the APS element not demonstrated\", \"Single lab, limited transcript set\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Kinase-specific studies extended the RSK-RPS6 axis to tissue regeneration and proliferation, with RSK-3 driving cartilage progenitor proliferation and IL-3/p90S6K driving eosinophil translational programs.\",\n      \"evidence\": \"RSK-3 knockout/overexpression in OA mice, CSPC profiling; eosinophil p90S6K inhibition with semaphorin-7A translation readout\",\n      \"pmids\": [\"32550912\", \"26276876\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RPS6 phosphorylation inferred as the effective downstream node but not isolated genetically in these contexts\", \"Single study per tissue\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Non-phosphorylatable RPS6 knock-in mice resolved whether RPS6 phosphorylation is functionally required in vivo, showing it is essential for PNS/CNS axon regeneration (downstream of RSK2) and a modulator of skin wound closure.\",\n      \"evidence\": \"Non-phosphorylatable RPS6 knock-in, RSK2 KO/overexpression, DRG preconditioning, dorsal column crush, wound healing assays, behavioral recovery\",\n      \"pmids\": [\"37068088\", \"37098351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular targets through which phospho-RPS6 acts in neurons and skin not defined\", \"Distinction between ribosomal and extra-ribosomal action unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Disease-model genetics defined RPS6 regulation and dosage requirements: PPP2R5D-PP2A is a phosphatase brake on mTORC1-RPS6, and hepatic Rps6 insufficiency causes biliary and hepatocyte failure that is only partially p53-dependent.\",\n      \"evidence\": \"CRISPR-PRIME PPP2R5D variant cell lines with phosphoproteomics and inhibitors; liver-specific Rps6 KO with c-Myc/p53 rescue and epistasis\",\n      \"pmids\": [\"37572851\", \"36656901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"p53-independent component of the liver phenotype unidentified\", \"Whether PP2A directly dephosphorylates RPS6 versus upstream kinases not separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Interactome studies revealed non-ribosomal RPS6 functions, binding spliceosome components and MCM7 to regulate alternative splicing and oncogenic activity, with NBEAL2 controlling RPS6 protein homeostasis.\",\n      \"evidence\": \"IP-MS, RIP-seq, RNA-seq, xenografts, vivo-PMO knockdown; NBEAL2 co-IP and CRISPR KO in mast cells\",\n      \"pmids\": [\"39309509\", \"38272677\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus ribosome-mediated splicing role not fully separated\", \"Structural basis of MCM7 and NBEAL2 binding only predicted\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Newer studies broaden RPS6 biology to intercellular transfer and immune signaling, with astrocyte EV-packaged Rps6 supporting axonal local translation and histamine-H2R driving RPS6 phosphorylation in dendritic cells.\",\n      \"evidence\": \"Astrocyte EV proteomics and vesicular Rps6 knockdown with local translation/synaptic readouts; whole-blood basophil/H2R antagonist flow cytometry\",\n      \"pmids\": [\"41416952\", \"40932794\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of RPS6 EV packaging and uptake unknown\", \"Functional downstream targets of H2R-RPS6 in DCs undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RPS6 phosphorylation at specific serines mechanistically translates into selective mRNA translation and into its diverse extra-ribosomal effects on cytoskeleton, splicing, and tissue remodeling remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model linking phospho-state to ribosome function or partner binding\", \"Whether cytoskeletal and splicing roles require ribosome association is unknown\", \"Substrate specificity differences among S6K1, RSK, CK2 inputs not reconciled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 16, 24]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [11, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [16, 24]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [0, 1, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 11, 18]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"complexes\": [\n      \"40S ribosomal subunit\",\n      \"\\u03b2-arrestin/p70S6K/rpS6 complex\",\n      \"spliceosome (associated)\"\n    ],\n    \"partners\": [\n      \"RPS6KB1\",\n      \"ARRB1\",\n      \"PPP2R5D\",\n      \"NBEAL2\",\n      \"MCM7\",\n      \"RPS4XL\",\n      \"RSK2\",\n      \"ARP3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}