{"gene":"RPL22","run_date":"2026-06-10T07:46:26","timeline":{"discoveries":[{"year":1991,"finding":"EAP (later identified as RPL22/L22) is a 14,777 Da, 128 amino acid cellular RNA-binding protein that associates with Epstein-Barr virus small RNAs EBER1 and EBER2. Purification and cDNA cloning revealed a potential nuclear localization signal and highly acidic carboxy terminus.","method":"Protein purification, cDNA cloning, RNA co-immunoprecipitation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — protein purified to homogeneity, cDNA cloned, binding confirmed biochemically; foundational paper replicated by multiple subsequent studies","pmids":["1846807"],"is_preprint":false},{"year":1993,"finding":"RPL22/EAP binds a specific stem-loop structure (stem-loop 3) of EBER1 in a sequence-specific manner, recognizing both single-stranded and double-stranded regions. Bacterially expressed GST-EAP fusion protein binds EBER1 independently of any other cellular or viral protein. A second, weaker binding site exists on stem-loop 4.","method":"RNase protection assay, gel-shift assay with recombinant GST-EAP fusion protein, EBER1 deletion and mutational analysis, anti-EAP immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with recombinant protein, detailed mutational analysis, multiple orthogonal methods","pmids":["8380232"],"is_preprint":false},{"year":1994,"finding":"EAP is the ribosomal protein L22. Approximately half of L22 in EBV-positive cells is contained within the EBER1 RNP particle; the other half resides in monoribosomes and polysomes. In EBV-positive lymphocytes, L22 is relocalized from the cytoplasm/nucleolus to the nucleoplasm through binding to EBER1. In vitro incubation of uninfected cell extracts with excess EBER1 RNA does not remove L22 from pre-existing ribosomes, suggesting in vivo EBER1 binding precedes ribosome assembly.","method":"Immunofluorescence with anti-L22 antibodies, subcellular fractionation (monoribosomes/polysomes), in situ hybridization, in vitro binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (immunofluorescence, fractionation, in vitro binding), replicated by subsequent studies","pmids":["8159770"],"is_preprint":false},{"year":1994,"finding":"RPL22/L22 is a heparin-binding protein (HBp15) purified from submandibular gland and bovine brain, identified as mammalian ribosomal protein L22 by antibody recognition of a single polypeptide in the large ribosomal subunit fraction.","method":"Heparin-affinity purification, immunochemical analysis of subcellular fractions, cDNA cloning and sequencing","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, biochemical fractionation confirms ribosomal localization and heparin-binding activity","pmids":["8135813"],"is_preprint":false},{"year":1995,"finding":"SELEX analysis identified a stem-loop motif as the general L22-binding RNA element, with three conserved nucleotide positions. Two independent L22 binding sites exist on EBER1 and two L22 molecules can interact with EBER1 simultaneously. Human 28S rRNA stem-loop (nucleotides 302-317) was identified as a cellular L22 ligand via cDNA-SELEX.","method":"SELEX (systematic evolution of ligands by exponential enrichment), mobility shift assays, cDNA-derived RNA library selection","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with recombinant protein, SELEX with multiple rounds of selection, identification of consensus binding motif","pmids":["7494316"],"is_preprint":false},{"year":1996,"finding":"RPL22/EAP interacts with the DNA-binding domain of HSV-1 ICP4. GST-EAP fusion protein disrupts ICP4 binding to its cognate DNA site in a dose-dependent manner. Late in infection, EAP is translocated from nucleoli to colocalize with ICP4 in small dense nuclear structures, a process dependent on viral DNA synthesis.","method":"Gel-shift assay, GST fusion protein pulldown, immunofluorescence colocalization, viral mutant analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pulldown plus gel-shift plus immunofluorescence in single lab, functional consequence (disruption of DNA binding) demonstrated","pmids":["8643445"],"is_preprint":false},{"year":1998,"finding":"Crystal structure of Thermus thermophilus L22 was solved by X-ray crystallography. L22 consists of a small alpha+beta domain and a protruding beta hairpin (30 Å long). The erythromycin-resistance conferring mutation is located in the protruding beta hairpin, predicted to interact with the erythromycin-binding site near the peptidyl transferase center.","method":"X-ray crystallography","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure solved, structurally informed mechanism for antibiotic resistance, replicated by subsequent structural studies","pmids":["9862810"],"is_preprint":false},{"year":1999,"finding":"Erythromycin resistance mutations in L22 (and L4) perturb rRNA conformation at multiple sites in domains II, III, and V of 23S rRNA, despite these proteins binding primarily to domain I. The L22 mutation influences modification at positions m5U747, G748, A1268 (domain II), A1614 (domain III), and G2351 (domain V). Neither L22 nor L4 mutations produce detectable effects at A2058 in domain V.","method":"Chemical modification/probing of 23S rRNA in erythromycin-resistant E. coli ribosomes bearing L22 and L4 mutations","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous chemical probing with multiple probes and nucleotide positions, mechanistically informative negative result also reported","pmids":["10369764"],"is_preprint":false},{"year":2000,"finding":"Nuclear import of human RPL22 depends on a classical nuclear localization signal (four lysines at positions 13-16). Nucleolar entry requires the KKYLKK sequence (I-domain, positions 88-93). The C-terminal acidic residue cluster plays a nuclear retention role, concealed by weak interaction with the N-domain (positions 1-9). Assembly into the ribosome depends on the N-domain, which upon dissociation from its interaction with the C-domain, binds to 28S rRNA.","method":"Deletion mutagenesis, yeast two-hybrid (N-domain/C-domain interaction), subcellular localization studies","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis with functional readouts (localization, ribosome assembly), yeast two-hybrid for intra-molecular interaction","pmids":["11056215"],"is_preprint":false},{"year":2001,"finding":"Cryo-electron microscopy of erythromycin-resistant E. coli 70S ribosomes with L4 and L22 mutations reveals that ribosomal proteins L4 and L22 may be involved in the regulation of a multiple exit system in the large subunit tunnel, with opening and closing of the main tunnel being dynamic features possibly accompanied by changes in the L7/L12 stalk region.","method":"Cryo-electron microscopy (3D reconstruction) of erythromycin-resistant ribosomes","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural determination by cryo-EM of functional mutant ribosomes, direct visualization of tunnel topology changes","pmids":["11511371"],"is_preprint":false},{"year":2002,"finding":"A three-amino-acid deletion (equivalent of MKR triplet) in the protruding beta hairpin of L22 that interacts with 23S rRNA renders cells resistant to erythromycin and quinupristin. Crystal structure of the Thermus thermophilus L22 mutant at 1.8 Å shows the mutant beta-hairpin is bent inward into the ribosome tunnel, modifying the narrowest part of the tunnel and affecting the orientation of 23S rRNA nucleotides that form the erythromycin-binding pocket.","method":"X-ray crystallography of L22 mutant, structural superposition within 50S subunits from H. marismortui and D. radiodurans","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure at 1.8 Å resolution with functional validation from known resistance phenotype","pmids":["12225755"],"is_preprint":false},{"year":2004,"finding":"L22 and PKR compete for a common binding site on EBER-1. L22 interferes with the ability of EBER-1 to inhibit PKR activation by dsRNA. Expression of L22 prevents both PKR-dependent and -independent stimulatory effects of EBER-1 on gene expression in vivo.","method":"RNA-protein competition binding assays, reporter gene assays in murine embryonic fibroblasts, PKR knockout cells","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — competition binding assay plus in vivo reporter assay plus genetic epistasis (PKR KO), single lab","pmids":["15128299"],"is_preprint":false},{"year":2006,"finding":"EBER1 contains three L22 binding sites (stem-loops I, III, and IV), and up to three L22 molecules can bind per EBER1 molecule simultaneously. In vivo UV cross-linking confirms multiple L22 binding sites on EBER1 inside cells.","method":"EMSA with purified recombinant L22 and MBP-L22, EBER1 deletion constructs, EBER1 stem-loop insertion into non-binding RNA, in vivo UV cross-linking","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified components, multiple orthogonal methods, in vivo validation","pmids":["16556938"],"is_preprint":false},{"year":2007,"finding":"Germline ablation of Rpl22 in mice selectively arrests development of alphabeta T lineage cells at the beta-selection checkpoint by inducing cell death. The death is caused by induction of p53 expression, as p53 deficiency blocks death and restores development. Rpl22 deficiency leads to selective upregulation of p53 at least in part by increasing p53 synthesis. gammadelta T lineage cells are spared.","method":"Conditional/germline knockout mice, flow cytometry, genetic epistasis (p53-deficient background), thymocyte death assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean germline KO with specific phenotypic readout, p53 epistasis demonstrated by double KO rescue, replicated in subsequent studies","pmids":["17555992"],"is_preprint":false},{"year":2009,"finding":"Basic amino acids 80-93 of L22 are required for high-affinity binding to 28S rRNA and EBER-1. These same residues are also critical for nucleolar accumulation and incorporation into ribosomes, supporting the model that nucleolar localization is mediated by rRNA interaction rather than a defined localization signal.","method":"Mutagenesis of L22, RNA-protein binding assays, GFP-tagged mutant localization by fluorescence microscopy, ribosome incorporation assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic mutagenesis with multiple orthogonal readouts (RNA binding, subcellular localization, ribosome incorporation)","pmids":["19390581"],"is_preprint":false},{"year":2009,"finding":"EBER-1-mediated relocalization of L22 from nucleolus to nucleoplasm requires intact L22 binding sites on EBER-1. Mutation of L22 binding sites on EBER-1 prevents L22 binding, inhibits EBER-1-dependent L22 relocalization, and significantly reduces the capacity of EBER-1 to enhance cell growth potential in soft agar colony formation assays.","method":"RNA-protein binding assays, fluorescence localization studies, soft agar colony formation assay in Burkitt lymphoma cells expressing mutant EBER-1","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic link between L22 binding, relocalization, and functional consequence (growth promotion) established with binding-deficient EBER-1 mutants","pmids":["19640998"],"is_preprint":false},{"year":2012,"finding":"Monoallelic germline inactivation of Rpl22 predisposes T-lineage progenitors to transformation by inducing expression of the stemness factor Lin28B. Rpl22 inactivation accelerates thymic lymphoma development and increases transformation potential through Lin28B induction.","method":"Mouse genetic model (Rpl22 heterozygous knockout), thymic lymphoma assay, in vitro transformation assays, Lin28B expression analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic model with specific oncogenic phenotype and identification of Lin28B as downstream effector, single lab","pmids":["22976955"],"is_preprint":false},{"year":2013,"finding":"Rpl22 controls ribosome composition by directly repressing expression of its paralog Rpl22l1 through binding to an internal hairpin structure in Rpl22l1 mRNA. Loss of Rpl22 results in compensatory upregulation and incorporation of Rpl22l1 into ribosomes.","method":"Rpl22 knockout mice, RNA-binding assays (Rpl22 binding to Rpl22l1 mRNA hairpin), ribosome fractionation, Rpl22l1 knockdown rescue experiments","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods: KO mouse, RNA-binding assay, ribosome fractionation, functional rescue","pmids":["23990801"],"is_preprint":false},{"year":2014,"finding":"Miz-1 directly activates the Rpl22 gene, and RPL22 protein binds to p53 mRNA and negatively regulates its translation. This mechanism limits p53 expression levels in pro-B and DN3a pre-T cells undergoing V(D)J recombination, protecting them from DNA damage-induced apoptosis.","method":"ChIP (Miz-1 binding to Rpl22 promoter), RNA-protein binding assays (RPL22 binding to p53 mRNA), p53 protein level analysis in Miz-1 deficient cells, genetic epistasis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP establishes Miz-1 as direct transcriptional activator, RNA binding assay shows RPL22 binds p53 mRNA, functional consequence demonstrated in relevant cell types","pmids":["25468973"],"is_preprint":false},{"year":2016,"finding":"Loss of Rpl22 exacerbates ER stress selectively in alphabeta T cell progenitors but not gammadelta progenitors. The exacerbated ER stress leads to PERK-dependent p53 induction and selective arrest of alphabeta T cells. Pharmacological induction of ER stress replicates the selective block, and PERK knockdown blunts p53 induction and rescues development.","method":"Rpl22 knockout mice, pharmacological ER stress induction, PERK knockdown, p53 measurement, T cell development assays by flow cytometry","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (genetic KO, pharmacological, genetic knockdown) with clear mechanistic pathway placement (Rpl22 → ER stress → PERK → p53 → arrest)","pmids":["27489283"],"is_preprint":false},{"year":2016,"finding":"Biallelic loss of Rpl22 restricts lymphoma dissemination by downregulating KLF2 transcription factor and its target sphingosine 1-phosphate receptor 1 (S1PR1). Re-expression of S1PR1 in Rpl22-deficient tumor cells restores their migratory capacity in vitro.","method":"Rpl22 knockout crossed to lymphoma-prone AKT2-Tg or PTEN-deficient mice, S1PR1 re-expression rescue assay, KLF2/S1PR1 expression analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic model, pathway placement (Rpl22 → KLF2 → S1PR1 → migration), rescue experiment, single lab","pmids":["27197189"],"is_preprint":false},{"year":2017,"finding":"RPL22/eL22 binds to MDM2 acidic domain and inhibits MDM2-mediated p53 ubiquitination and degradation, extending p53 half-life. RPL22 forms a complex with MDM2/RPL5(uL18)/RPL11(uL5) and synergizes with RPL11 to activate p53. The N-terminus of RPL22 binds MDM2, while the C-terminus interacts with RPL5/RPL11. Ribosomal stress by Actinomycin D increases the ribosome-free RPL22 pool.","method":"Co-immunoprecipitation, GST pulldown (domain mapping), ubiquitination assay, colony formation assay (p53-dependent), ribosome profiling","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (Co-IP, pulldown with domain mapping, functional ubiquitination assay), single lab","pmids":["29207594"],"is_preprint":false},{"year":2017,"finding":"Rpl22 and its paralog Rpl22l1 (Like1) play antagonistic extraribosomal roles in controlling morphogenesis. During gastrulation, Rpl22 translocates to the nucleus where it binds intronic sequences of smad2 pre-mRNA and induces exon 9 skipping in cooperation with hnRNP-A1. Like1 opposes this by promoting exon 9 inclusion. This antagonistic splicing regulation controls Nodal/TGF-β signaling during zebrafish embryogenesis.","method":"Nuclear localization studies (fractionation), RNA-immunoprecipitation (Rpl22 binding to smad2 pre-mRNA intron), splicing assays, hnRNP-A1 interaction, zebrafish morpholino/overexpression morphogenesis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods: nuclear fractionation, RIP showing intronic binding, splicing assays, functional morphogenesis readout, demonstrated antagonism with paralog","pmids":["28076796"],"is_preprint":false},{"year":2019,"finding":"RPL22/eL22 binds and inhibits CDK4-Cyclin D1 complex, decreasing RB phosphorylation both in vitro and in cells. Ribosome-free RPL22/eL22 enforces a cell cycle arrest that induces an RB- and p53-dependent senescent phenotype in human fibroblasts.","method":"In vitro kinase assay (CDK4-CyclinD1 inhibition), co-immunoprecipitation, RB phosphorylation measurement, senescence assays with RPL22 overexpression","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay demonstrates direct CDK4 inhibition, supported by cellular experiments, single lab","pmids":["30874462"],"is_preprint":false},{"year":2020,"finding":"RPL22 binds to the first 20 nucleotides of the 5'UTR of CCL2 mRNA following LPS stimulation, and translocates to the nucleus. RPL22 interaction with UPF1 (up-frameshift-1 protein) results in cytoplasmic degradation of CCL2 mRNA, post-transcriptionally regulating CCL2 expression and monocyte migration during LPS-mediated inflammation.","method":"RNA-protein binding assay (RPL22 binding to CCL2 5'UTR), co-immunoprecipitation (RPL22-UPF1 interaction), nuclear translocation assay, RPL22 knockdown with CCL2 expression and monocyte migration readout","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA binding mapped to specific 5'UTR sequence, protein-protein interaction shown, functional consequence in monocyte migration, single lab","pmids":["32383535"],"is_preprint":false},{"year":2024,"finding":"RPL22 modulates splicing of MDM4 pre-mRNA through an alternative splicing switch in exon 6. RPL22 loss increases MDM4 exon 6 inclusion and cell proliferation, augmenting resistance to Nutlin-3a. RPL22 also represses RPL22L1 expression by mediating splicing of a cryptic exon corresponding to a truncated transcript.","method":"Splicing assays, RPL22 loss-of-function (frameshift mutations), MDM4 splicing isoform quantification, proliferation assays, Nutlin-3a resistance assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — splicing mechanism established with loss-of-function and functional readouts, single lab, peer-reviewed","pmids":["39146182"],"is_preprint":false},{"year":1999,"finding":"Drosophila RPL22 (PBP-12) interacts with the auto-modification domain of Drosophila PARP through the conserved core of rpL22. Purified DmCKII can phosphorylate a GST-L22 fusion protein at the C-terminal end, identifying RPL22 as a substrate of CKII.","method":"Far-Western screening, GST-rpL22 fusion protein pulldown, in vitro kinase assay","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Far-Western and GST pulldown only, single lab, Drosophila ortholog; PARP interaction and CKII phosphorylation shown in vitro but not validated in mammalian cells","pmids":["9931508"],"is_preprint":false},{"year":2002,"finding":"Drosophila CKII catalytic subunit interacts with Drosophila ribosomal protein L22 via the conserved core of rpL22, as shown by yeast two-hybrid and GST pulldown. CKII phosphorylates L22 at its C-terminal end in vitro.","method":"Yeast two-hybrid, GST pulldown, in vitro kinase assay","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid plus GST pulldown, in vitro only, Drosophila ortholog, single lab","pmids":["12379220"],"is_preprint":false},{"year":2011,"finding":"p53-mediated developmental arrest of Rpl22-deficient alphabeta T cells is enforced principally through effects on cell survival via PUMA and Bim. Co-elimination of PUMA and Bim results in nearly complete restoration of Rpl22-deficient thymocyte development. Overexpression of miR-34a causes developmental arrest reminiscent of p53 activation in Rpl22-deficient T cells.","method":"Genetic epistasis (double KO of PUMA/Bim, p21, miR-34a overexpression), flow cytometry of thymocyte development, gene expression analysis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous double-KO epistasis with specific rescue readout, identifies PUMA and Bim as principal effectors downstream of p53 in Rpl22-deficient cells","pmids":["21690328"],"is_preprint":false},{"year":2015,"finding":"Germline ablation of Rpl22 causes a selective p53-dependent arrest of early B cell development at the pro-B cell stage in bone marrow. Rpl22-deficient pro-B cells are hyporesponsive to IL-7, but the arrest does not result from disrupted IL-7 signaling. p53 deficiency rescues the B cell developmental defect.","method":"Germline Rpl22 KO mice, flow cytometry, IL-7 signaling analysis, p53 KO epistasis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific developmental phenotype, negative result (not IL-7 signaling) plus positive epistasis (p53 rescue), extends established mechanism to B cell lineage","pmids":["25416806"],"is_preprint":false},{"year":2016,"finding":"In S. cerevisiae, Rpl22A and Rpl22B are required for selective translation of IME1 mRNA through its unusually long 5'UTR, required for meiotic induction. Rpl22 maintains high free 60S subunit levels under conditions of high translational output, preventing halfmer formation. Deleting the IME1 5'UTR bypasses the requirement for Rpl22.","method":"Rpl22 yeast mutants, polysome profiling, 5'UTR deletion analysis, Ime1 protein level measurement, meiotic phenotype assays","journal":"Cell division","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic system, polysome profiling, 5'UTR deletion rescue; yeast ortholog with well-conserved function","pmids":["27478489"],"is_preprint":false}],"current_model":"RPL22 (eL22) is a component of the 60S ribosomal large subunit that, beyond its structural role in ribosome assembly (where its beta-hairpin lines the peptide exit tunnel and interacts with 23S/28S rRNA), performs multiple extraribosomal regulatory functions: it binds EBV EBER1 RNA at three stem-loop sites causing nucleoplasmic relocalization; it post-transcriptionally represses p53 mRNA translation (activated by Miz-1), thereby controlling lymphocyte development; it binds MDM2's acidic domain to inhibit MDM2-mediated p53 ubiquitination and degradation; it translocates to the nucleus to regulate pre-mRNA splicing of smad2 (opposing its paralog RPL22L1) and MDM4; it inhibits CDK4-Cyclin D1 as ribosome-free protein to enforce cell cycle arrest; it binds CCL2 mRNA 5'UTR to post-transcriptionally repress CCL2 during inflammation; and it controls ribosome heterogeneity by directly repressing its paralog RPL22L1 mRNA through hairpin binding."},"narrative":{"mechanistic_narrative":"RPL22 (eL22) is a component of the 60S ribosomal large subunit that doubles as a sequence-specific RNA-binding protein with extensive extraribosomal regulatory functions in development, stress responses, and tumor suppression [PMID:8159770, PMID:17555992]. Within the ribosome its protruding beta-hairpin lines the polypeptide exit tunnel and contacts 23S/28S rRNA; mutations in this hairpin remodel the tunnel and confer macrolide resistance [PMID:9862810, PMID:11511371, PMID:12225755], and high-affinity rRNA binding through basic residues 80-93 drives both nucleolar accumulation and ribosome incorporation [PMID:19390581]. Independently of the ribosome, RPL22 recognizes a stem-loop RNA motif defined by SELEX [PMID:7494316], first identified through its binding to three stem-loops of the EBV non-coding RNA EBER1, which relocalizes RPL22 from the nucleolus to the nucleoplasm and promotes lymphoma cell growth [PMID:8380232, PMID:16556938, PMID:19640998]. A dominant physiological role is restraint of p53: RPL22 post-transcriptionally represses p53 mRNA translation—an activity transcriptionally driven by Miz-1—to protect lymphoid progenitors undergoing V(D)J recombination, and germline Rpl22 loss triggers p53-dependent, PUMA/Bim-mediated arrest of alphabeta T cell and pro-B cell development at lineage-specific checkpoints, in part via PERK-coupled ER stress [PMID:17555992, PMID:25468973, PMID:21690328, PMID:25416806, PMID:27489283]. RPL22 also acts as a nuclear splicing regulator, binding intronic and exonic sequences of smad2 and MDM4 pre-mRNAs to control Nodal/TGF-beta signaling and MDM4 isoform output in functional antagonism with its paralog RPL22L1, whose expression RPL22 directly represses to govern ribosome heterogeneity [PMID:28076796, PMID:39146182, PMID:23990801]. Loss-of-function in lymphoid cells is oncogenic, inducing the stemness factor Lin28B and accelerating thymic lymphoma [PMID:22976955].","teleology":[{"year":1991,"claim":"Established the protein's existence as a discrete cellular RNA-binding factor (EAP) physically associated with EBV small RNAs, before its ribosomal identity was known.","evidence":"Protein purification, cDNA cloning, and RNA co-immunoprecipitation of EBER1/EBER2-associated protein","pmids":["1846807"],"confidence":"High","gaps":["Did not identify EAP as ribosomal protein L22","Functional consequence of EBER binding unknown"]},{"year":1993,"claim":"Demonstrated that RNA recognition is direct and sequence-specific, mapping binding to a defined EBER1 stem-loop without requiring other factors.","evidence":"Gel-shift and RNase protection with recombinant GST-EAP, EBER1 mutational analysis","pmids":["8380232"],"confidence":"High","gaps":["Cellular RNA ligands beyond EBER1 not yet defined","No consensus binding motif"]},{"year":1994,"claim":"Resolved that EAP is ribosomal protein L22 and showed EBER1 binding redistributes a pool of L22 to the nucleoplasm, defining its dual ribosomal/extraribosomal nature.","evidence":"Immunofluorescence, subcellular fractionation, in situ hybridization, in vitro binding; plus independent heparin-affinity identification as HBp15","pmids":["8159770","8135813"],"confidence":"High","gaps":["Mechanism partitioning L22 between ribosome and EBER1 RNP unclear","Whether relocalized L22 has a function not addressed"]},{"year":1995,"claim":"Defined a general stem-loop RNA recognition motif for L22 and identified a cellular 28S rRNA ligand, generalizing its RNA-binding specificity beyond EBER1.","evidence":"SELEX, cDNA-SELEX, and mobility shift assays","pmids":["7494316"],"confidence":"High","gaps":["mRNA targets not yet identified","Functional readout of motif binding absent"]},{"year":1998,"claim":"Determined the L22 fold and localized the antibiotic-resistance-conferring beta-hairpin, linking protein structure to the ribosome exit tunnel.","evidence":"X-ray crystallography of T. thermophilus L22","pmids":["9862810"],"confidence":"High","gaps":["Dynamics of hairpin in intact ribosome not shown","Mammalian structural details inferred from bacterial protein"]},{"year":2002,"claim":"Connected L22 hairpin geometry to tunnel architecture by showing a resistance-conferring deletion bends the hairpin into the tunnel, and cryo-EM linked L22/L4 to a dynamic multi-exit tunnel system.","evidence":"X-ray crystallography of L22 mutant, chemical rRNA probing, cryo-EM of resistant 70S ribosomes","pmids":["12225755","10369764","11511371"],"confidence":"High","gaps":["Functional consequence of tunnel gating for nascent chains not defined","Bacterial system; mammalian relevance assumed"]},{"year":2009,"claim":"Showed that RNA binding (not a discrete signal) drives nucleolar localization and ribosome incorporation, unifying L22's RNA-recognition activity with its assembly behavior.","evidence":"Mutagenesis of residues 80-93 with RNA binding, GFP localization, and ribosome incorporation readouts; earlier import signal mapping","pmids":["19390581","11056215"],"confidence":"High","gaps":["How the same residues toggle between rRNA and mRNA targets unclear","Regulation of ribosome-free pool not addressed here"]},{"year":2007,"claim":"Revealed a physiological extraribosomal role: Rpl22 loss selectively arrests alphabeta T cell development via p53 induction, defining lineage-specific p53 control as a core function.","evidence":"Germline knockout mice with p53 epistasis and thymocyte death assays","pmids":["17555992"],"confidence":"High","gaps":["Molecular basis of p53 upregulation not yet defined","Why gammadelta lineage is spared unexplained"]},{"year":2014,"claim":"Established the molecular mechanism of p53 control—Miz-1 transcriptionally activates Rpl22, whose protein binds p53 mRNA to repress its translation in recombining lymphoid progenitors.","evidence":"ChIP, RNA-protein binding assays, p53 level analysis in Miz-1-deficient cells; earlier PUMA/Bim epistasis and B cell extension","pmids":["25468973","21690328","25416806"],"confidence":"High","gaps":["Direct binding site on p53 mRNA not finely mapped","Quantitative contribution of translational vs other control not resolved"]},{"year":2016,"claim":"Placed an ER-stress/PERK axis upstream of p53 in the developmental arrest, refining how Rpl22 loss converges on p53 in a lineage-selective manner.","evidence":"Knockout mice, pharmacological ER stress, PERK knockdown, p53 readouts","pmids":["27489283"],"confidence":"High","gaps":["How Rpl22 loss elevates ER stress mechanistically unclear","Link between ribosomal change and PERK activation undefined"]},{"year":2013,"claim":"Defined how Rpl22 governs ribosome heterogeneity by directly repressing its paralog Rpl22l1 via hairpin binding, with compensatory Rpl22l1 incorporation upon loss.","evidence":"Knockout mice, RNA-binding assays, ribosome fractionation, knockdown rescue; later refined as cryptic-exon splicing repression","pmids":["23990801","39146182"],"confidence":"High","gaps":["Functional consequences of paralog-swapped ribosomes incompletely defined","Whether repression is purely translational vs splicing-based clarified only later"]},{"year":2017,"claim":"Identified RPL22 as a nuclear pre-mRNA splicing regulator acting antagonistically with RPL22L1 on smad2 to control Nodal/TGF-beta signaling, broadening its extraribosomal repertoire beyond p53.","evidence":"Nuclear fractionation, RIP on smad2 introns, splicing assays, hnRNP-A1 interaction, zebrafish morphogenesis; MDM2-binding p53 stabilization and CDK4-Cyclin D1 inhibition reported same era","pmids":["28076796","29207594","30874462"],"confidence":"High","gaps":["Determinants directing RPL22 to specific introns unknown","Stoichiometry and trigger of nuclear translocation undefined"]},{"year":2024,"claim":"Extended splicing control to MDM4 exon 6, linking RPL22 loss to MDM4 isoform switching, increased proliferation, and Nutlin-3a resistance, integrating its splicing and p53-axis roles.","evidence":"Splicing assays, loss-of-function frameshift mutants, isoform quantification, proliferation and drug-resistance assays","pmids":["39146182"],"confidence":"Medium","gaps":["Direct binding site on MDM4 pre-mRNA not mapped","Single-lab; in vivo relevance to tumors not tested"]},{"year":2020,"claim":"Showed RPL22 post-transcriptionally represses CCL2 by binding its 5'UTR and recruiting UPF1 for cytoplasmic mRNA degradation, extending mRNA-target regulation to inflammation.","evidence":"RNA-binding assay, RPL22-UPF1 Co-IP, nuclear translocation and knockdown with monocyte migration readout","pmids":["32383535"],"confidence":"Medium","gaps":["Reciprocal validation of UPF1 interaction limited","Single lab; generality across inflammatory stimuli untested"]},{"year":null,"claim":"How RPL22 selects among its many RNA targets (rRNA, viral non-coding RNAs, paralog mRNA, p53 mRNA, CCL2 mRNA, smad2/MDM4 pre-mRNAs) and how the ribosome-free pool is dynamically generated and directed between cytoplasmic translational repression and nuclear splicing remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model coupling ribosome occupancy to target choice","Post-translational regulation of pool partitioning unknown","Structural basis for distinguishing mRNA targets from rRNA undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,4,12,14,17,18,22,24]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[6,9,10,14]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[17,22,25]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[18,21,23,24]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[2,3,6,14]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[2,5,14]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[2,15,22,24]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8,22,24]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,21,23]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[17,22,25,24]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[23,13]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[13,28,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[13,22,29]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[13,29,24]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[19]}],"complexes":["60S ribosomal large subunit","EBER1 ribonucleoprotein particle","MDM2/RPL5/RPL11/RPL22 complex"],"partners":["MDM2","RPL5","RPL11","RPL22L1","UPF1","HNRNP-A1","CDK4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P35268","full_name":"Large ribosomal subunit protein eL22","aliases":["60S ribosomal protein L22","EBER-associated protein","EAP","Epstein-Barr virus small RNA-associated protein","Heparin-binding protein HBp15"],"length_aa":128,"mass_kda":14.8,"function":"Component of the large ribosomal subunit (PubMed:23636399, PubMed:32669547). 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MECOM","url":"https://www.omim.org/entry/165215"},{"mim_id":"151385","title":"RUNT-RELATED TRANSCRIPTION FACTOR 1; RUNX1","url":"https://www.omim.org/entry/151385"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nucleoli","reliability":"Uncertain"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Purification and cDNA cloning revealed a potential nuclear localization signal and highly acidic carboxy terminus.\",\n      \"method\": \"Protein purification, cDNA cloning, RNA co-immunoprecipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — protein purified to homogeneity, cDNA cloned, binding confirmed biochemically; foundational paper replicated by multiple subsequent studies\",\n      \"pmids\": [\"1846807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RPL22/EAP binds a specific stem-loop structure (stem-loop 3) of EBER1 in a sequence-specific manner, recognizing both single-stranded and double-stranded regions. Bacterially expressed GST-EAP fusion protein binds EBER1 independently of any other cellular or viral protein. A second, weaker binding site exists on stem-loop 4.\",\n      \"method\": \"RNase protection assay, gel-shift assay with recombinant GST-EAP fusion protein, EBER1 deletion and mutational analysis, anti-EAP immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with recombinant protein, detailed mutational analysis, multiple orthogonal methods\",\n      \"pmids\": [\"8380232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"EAP is the ribosomal protein L22. Approximately half of L22 in EBV-positive cells is contained within the EBER1 RNP particle; the other half resides in monoribosomes and polysomes. In EBV-positive lymphocytes, L22 is relocalized from the cytoplasm/nucleolus to the nucleoplasm through binding to EBER1. In vitro incubation of uninfected cell extracts with excess EBER1 RNA does not remove L22 from pre-existing ribosomes, suggesting in vivo EBER1 binding precedes ribosome assembly.\",\n      \"method\": \"Immunofluorescence with anti-L22 antibodies, subcellular fractionation (monoribosomes/polysomes), in situ hybridization, in vitro binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (immunofluorescence, fractionation, in vitro binding), replicated by subsequent studies\",\n      \"pmids\": [\"8159770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"RPL22/L22 is a heparin-binding protein (HBp15) purified from submandibular gland and bovine brain, identified as mammalian ribosomal protein L22 by antibody recognition of a single polypeptide in the large ribosomal subunit fraction.\",\n      \"method\": \"Heparin-affinity purification, immunochemical analysis of subcellular fractions, cDNA cloning and sequencing\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, biochemical fractionation confirms ribosomal localization and heparin-binding activity\",\n      \"pmids\": [\"8135813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"SELEX analysis identified a stem-loop motif as the general L22-binding RNA element, with three conserved nucleotide positions. Two independent L22 binding sites exist on EBER1 and two L22 molecules can interact with EBER1 simultaneously. Human 28S rRNA stem-loop (nucleotides 302-317) was identified as a cellular L22 ligand via cDNA-SELEX.\",\n      \"method\": \"SELEX (systematic evolution of ligands by exponential enrichment), mobility shift assays, cDNA-derived RNA library selection\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with recombinant protein, SELEX with multiple rounds of selection, identification of consensus binding motif\",\n      \"pmids\": [\"7494316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"RPL22/EAP interacts with the DNA-binding domain of HSV-1 ICP4. GST-EAP fusion protein disrupts ICP4 binding to its cognate DNA site in a dose-dependent manner. Late in infection, EAP is translocated from nucleoli to colocalize with ICP4 in small dense nuclear structures, a process dependent on viral DNA synthesis.\",\n      \"method\": \"Gel-shift assay, GST fusion protein pulldown, immunofluorescence colocalization, viral mutant analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pulldown plus gel-shift plus immunofluorescence in single lab, functional consequence (disruption of DNA binding) demonstrated\",\n      \"pmids\": [\"8643445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Crystal structure of Thermus thermophilus L22 was solved by X-ray crystallography. L22 consists of a small alpha+beta domain and a protruding beta hairpin (30 Å long). The erythromycin-resistance conferring mutation is located in the protruding beta hairpin, predicted to interact with the erythromycin-binding site near the peptidyl transferase center.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure solved, structurally informed mechanism for antibiotic resistance, replicated by subsequent structural studies\",\n      \"pmids\": [\"9862810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Erythromycin resistance mutations in L22 (and L4) perturb rRNA conformation at multiple sites in domains II, III, and V of 23S rRNA, despite these proteins binding primarily to domain I. The L22 mutation influences modification at positions m5U747, G748, A1268 (domain II), A1614 (domain III), and G2351 (domain V). Neither L22 nor L4 mutations produce detectable effects at A2058 in domain V.\",\n      \"method\": \"Chemical modification/probing of 23S rRNA in erythromycin-resistant E. coli ribosomes bearing L22 and L4 mutations\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous chemical probing with multiple probes and nucleotide positions, mechanistically informative negative result also reported\",\n      \"pmids\": [\"10369764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Nuclear import of human RPL22 depends on a classical nuclear localization signal (four lysines at positions 13-16). Nucleolar entry requires the KKYLKK sequence (I-domain, positions 88-93). The C-terminal acidic residue cluster plays a nuclear retention role, concealed by weak interaction with the N-domain (positions 1-9). Assembly into the ribosome depends on the N-domain, which upon dissociation from its interaction with the C-domain, binds to 28S rRNA.\",\n      \"method\": \"Deletion mutagenesis, yeast two-hybrid (N-domain/C-domain interaction), subcellular localization studies\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis with functional readouts (localization, ribosome assembly), yeast two-hybrid for intra-molecular interaction\",\n      \"pmids\": [\"11056215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Cryo-electron microscopy of erythromycin-resistant E. coli 70S ribosomes with L4 and L22 mutations reveals that ribosomal proteins L4 and L22 may be involved in the regulation of a multiple exit system in the large subunit tunnel, with opening and closing of the main tunnel being dynamic features possibly accompanied by changes in the L7/L12 stalk region.\",\n      \"method\": \"Cryo-electron microscopy (3D reconstruction) of erythromycin-resistant ribosomes\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural determination by cryo-EM of functional mutant ribosomes, direct visualization of tunnel topology changes\",\n      \"pmids\": [\"11511371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A three-amino-acid deletion (equivalent of MKR triplet) in the protruding beta hairpin of L22 that interacts with 23S rRNA renders cells resistant to erythromycin and quinupristin. Crystal structure of the Thermus thermophilus L22 mutant at 1.8 Å shows the mutant beta-hairpin is bent inward into the ribosome tunnel, modifying the narrowest part of the tunnel and affecting the orientation of 23S rRNA nucleotides that form the erythromycin-binding pocket.\",\n      \"method\": \"X-ray crystallography of L22 mutant, structural superposition within 50S subunits from H. marismortui and D. radiodurans\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure at 1.8 Å resolution with functional validation from known resistance phenotype\",\n      \"pmids\": [\"12225755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"L22 and PKR compete for a common binding site on EBER-1. L22 interferes with the ability of EBER-1 to inhibit PKR activation by dsRNA. Expression of L22 prevents both PKR-dependent and -independent stimulatory effects of EBER-1 on gene expression in vivo.\",\n      \"method\": \"RNA-protein competition binding assays, reporter gene assays in murine embryonic fibroblasts, PKR knockout cells\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — competition binding assay plus in vivo reporter assay plus genetic epistasis (PKR KO), single lab\",\n      \"pmids\": [\"15128299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"EBER1 contains three L22 binding sites (stem-loops I, III, and IV), and up to three L22 molecules can bind per EBER1 molecule simultaneously. In vivo UV cross-linking confirms multiple L22 binding sites on EBER1 inside cells.\",\n      \"method\": \"EMSA with purified recombinant L22 and MBP-L22, EBER1 deletion constructs, EBER1 stem-loop insertion into non-binding RNA, in vivo UV cross-linking\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified components, multiple orthogonal methods, in vivo validation\",\n      \"pmids\": [\"16556938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Germline ablation of Rpl22 in mice selectively arrests development of alphabeta T lineage cells at the beta-selection checkpoint by inducing cell death. The death is caused by induction of p53 expression, as p53 deficiency blocks death and restores development. Rpl22 deficiency leads to selective upregulation of p53 at least in part by increasing p53 synthesis. gammadelta T lineage cells are spared.\",\n      \"method\": \"Conditional/germline knockout mice, flow cytometry, genetic epistasis (p53-deficient background), thymocyte death assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean germline KO with specific phenotypic readout, p53 epistasis demonstrated by double KO rescue, replicated in subsequent studies\",\n      \"pmids\": [\"17555992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Basic amino acids 80-93 of L22 are required for high-affinity binding to 28S rRNA and EBER-1. These same residues are also critical for nucleolar accumulation and incorporation into ribosomes, supporting the model that nucleolar localization is mediated by rRNA interaction rather than a defined localization signal.\",\n      \"method\": \"Mutagenesis of L22, RNA-protein binding assays, GFP-tagged mutant localization by fluorescence microscopy, ribosome incorporation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic mutagenesis with multiple orthogonal readouts (RNA binding, subcellular localization, ribosome incorporation)\",\n      \"pmids\": [\"19390581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"EBER-1-mediated relocalization of L22 from nucleolus to nucleoplasm requires intact L22 binding sites on EBER-1. Mutation of L22 binding sites on EBER-1 prevents L22 binding, inhibits EBER-1-dependent L22 relocalization, and significantly reduces the capacity of EBER-1 to enhance cell growth potential in soft agar colony formation assays.\",\n      \"method\": \"RNA-protein binding assays, fluorescence localization studies, soft agar colony formation assay in Burkitt lymphoma cells expressing mutant EBER-1\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic link between L22 binding, relocalization, and functional consequence (growth promotion) established with binding-deficient EBER-1 mutants\",\n      \"pmids\": [\"19640998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Monoallelic germline inactivation of Rpl22 predisposes T-lineage progenitors to transformation by inducing expression of the stemness factor Lin28B. Rpl22 inactivation accelerates thymic lymphoma development and increases transformation potential through Lin28B induction.\",\n      \"method\": \"Mouse genetic model (Rpl22 heterozygous knockout), thymic lymphoma assay, in vitro transformation assays, Lin28B expression analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic model with specific oncogenic phenotype and identification of Lin28B as downstream effector, single lab\",\n      \"pmids\": [\"22976955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rpl22 controls ribosome composition by directly repressing expression of its paralog Rpl22l1 through binding to an internal hairpin structure in Rpl22l1 mRNA. Loss of Rpl22 results in compensatory upregulation and incorporation of Rpl22l1 into ribosomes.\",\n      \"method\": \"Rpl22 knockout mice, RNA-binding assays (Rpl22 binding to Rpl22l1 mRNA hairpin), ribosome fractionation, Rpl22l1 knockdown rescue experiments\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods: KO mouse, RNA-binding assay, ribosome fractionation, functional rescue\",\n      \"pmids\": [\"23990801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Miz-1 directly activates the Rpl22 gene, and RPL22 protein binds to p53 mRNA and negatively regulates its translation. This mechanism limits p53 expression levels in pro-B and DN3a pre-T cells undergoing V(D)J recombination, protecting them from DNA damage-induced apoptosis.\",\n      \"method\": \"ChIP (Miz-1 binding to Rpl22 promoter), RNA-protein binding assays (RPL22 binding to p53 mRNA), p53 protein level analysis in Miz-1 deficient cells, genetic epistasis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP establishes Miz-1 as direct transcriptional activator, RNA binding assay shows RPL22 binds p53 mRNA, functional consequence demonstrated in relevant cell types\",\n      \"pmids\": [\"25468973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Loss of Rpl22 exacerbates ER stress selectively in alphabeta T cell progenitors but not gammadelta progenitors. The exacerbated ER stress leads to PERK-dependent p53 induction and selective arrest of alphabeta T cells. Pharmacological induction of ER stress replicates the selective block, and PERK knockdown blunts p53 induction and rescues development.\",\n      \"method\": \"Rpl22 knockout mice, pharmacological ER stress induction, PERK knockdown, p53 measurement, T cell development assays by flow cytometry\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (genetic KO, pharmacological, genetic knockdown) with clear mechanistic pathway placement (Rpl22 → ER stress → PERK → p53 → arrest)\",\n      \"pmids\": [\"27489283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Biallelic loss of Rpl22 restricts lymphoma dissemination by downregulating KLF2 transcription factor and its target sphingosine 1-phosphate receptor 1 (S1PR1). Re-expression of S1PR1 in Rpl22-deficient tumor cells restores their migratory capacity in vitro.\",\n      \"method\": \"Rpl22 knockout crossed to lymphoma-prone AKT2-Tg or PTEN-deficient mice, S1PR1 re-expression rescue assay, KLF2/S1PR1 expression analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic model, pathway placement (Rpl22 → KLF2 → S1PR1 → migration), rescue experiment, single lab\",\n      \"pmids\": [\"27197189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RPL22/eL22 binds to MDM2 acidic domain and inhibits MDM2-mediated p53 ubiquitination and degradation, extending p53 half-life. RPL22 forms a complex with MDM2/RPL5(uL18)/RPL11(uL5) and synergizes with RPL11 to activate p53. The N-terminus of RPL22 binds MDM2, while the C-terminus interacts with RPL5/RPL11. Ribosomal stress by Actinomycin D increases the ribosome-free RPL22 pool.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown (domain mapping), ubiquitination assay, colony formation assay (p53-dependent), ribosome profiling\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (Co-IP, pulldown with domain mapping, functional ubiquitination assay), single lab\",\n      \"pmids\": [\"29207594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rpl22 and its paralog Rpl22l1 (Like1) play antagonistic extraribosomal roles in controlling morphogenesis. During gastrulation, Rpl22 translocates to the nucleus where it binds intronic sequences of smad2 pre-mRNA and induces exon 9 skipping in cooperation with hnRNP-A1. Like1 opposes this by promoting exon 9 inclusion. This antagonistic splicing regulation controls Nodal/TGF-β signaling during zebrafish embryogenesis.\",\n      \"method\": \"Nuclear localization studies (fractionation), RNA-immunoprecipitation (Rpl22 binding to smad2 pre-mRNA intron), splicing assays, hnRNP-A1 interaction, zebrafish morpholino/overexpression morphogenesis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods: nuclear fractionation, RIP showing intronic binding, splicing assays, functional morphogenesis readout, demonstrated antagonism with paralog\",\n      \"pmids\": [\"28076796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RPL22/eL22 binds and inhibits CDK4-Cyclin D1 complex, decreasing RB phosphorylation both in vitro and in cells. Ribosome-free RPL22/eL22 enforces a cell cycle arrest that induces an RB- and p53-dependent senescent phenotype in human fibroblasts.\",\n      \"method\": \"In vitro kinase assay (CDK4-CyclinD1 inhibition), co-immunoprecipitation, RB phosphorylation measurement, senescence assays with RPL22 overexpression\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay demonstrates direct CDK4 inhibition, supported by cellular experiments, single lab\",\n      \"pmids\": [\"30874462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RPL22 binds to the first 20 nucleotides of the 5'UTR of CCL2 mRNA following LPS stimulation, and translocates to the nucleus. RPL22 interaction with UPF1 (up-frameshift-1 protein) results in cytoplasmic degradation of CCL2 mRNA, post-transcriptionally regulating CCL2 expression and monocyte migration during LPS-mediated inflammation.\",\n      \"method\": \"RNA-protein binding assay (RPL22 binding to CCL2 5'UTR), co-immunoprecipitation (RPL22-UPF1 interaction), nuclear translocation assay, RPL22 knockdown with CCL2 expression and monocyte migration readout\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA binding mapped to specific 5'UTR sequence, protein-protein interaction shown, functional consequence in monocyte migration, single lab\",\n      \"pmids\": [\"32383535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RPL22 modulates splicing of MDM4 pre-mRNA through an alternative splicing switch in exon 6. RPL22 loss increases MDM4 exon 6 inclusion and cell proliferation, augmenting resistance to Nutlin-3a. RPL22 also represses RPL22L1 expression by mediating splicing of a cryptic exon corresponding to a truncated transcript.\",\n      \"method\": \"Splicing assays, RPL22 loss-of-function (frameshift mutations), MDM4 splicing isoform quantification, proliferation assays, Nutlin-3a resistance assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — splicing mechanism established with loss-of-function and functional readouts, single lab, peer-reviewed\",\n      \"pmids\": [\"39146182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Drosophila RPL22 (PBP-12) interacts with the auto-modification domain of Drosophila PARP through the conserved core of rpL22. Purified DmCKII can phosphorylate a GST-L22 fusion protein at the C-terminal end, identifying RPL22 as a substrate of CKII.\",\n      \"method\": \"Far-Western screening, GST-rpL22 fusion protein pulldown, in vitro kinase assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Far-Western and GST pulldown only, single lab, Drosophila ortholog; PARP interaction and CKII phosphorylation shown in vitro but not validated in mammalian cells\",\n      \"pmids\": [\"9931508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Drosophila CKII catalytic subunit interacts with Drosophila ribosomal protein L22 via the conserved core of rpL22, as shown by yeast two-hybrid and GST pulldown. CKII phosphorylates L22 at its C-terminal end in vitro.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, in vitro kinase assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid plus GST pulldown, in vitro only, Drosophila ortholog, single lab\",\n      \"pmids\": [\"12379220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"p53-mediated developmental arrest of Rpl22-deficient alphabeta T cells is enforced principally through effects on cell survival via PUMA and Bim. Co-elimination of PUMA and Bim results in nearly complete restoration of Rpl22-deficient thymocyte development. Overexpression of miR-34a causes developmental arrest reminiscent of p53 activation in Rpl22-deficient T cells.\",\n      \"method\": \"Genetic epistasis (double KO of PUMA/Bim, p21, miR-34a overexpression), flow cytometry of thymocyte development, gene expression analysis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous double-KO epistasis with specific rescue readout, identifies PUMA and Bim as principal effectors downstream of p53 in Rpl22-deficient cells\",\n      \"pmids\": [\"21690328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Germline ablation of Rpl22 causes a selective p53-dependent arrest of early B cell development at the pro-B cell stage in bone marrow. Rpl22-deficient pro-B cells are hyporesponsive to IL-7, but the arrest does not result from disrupted IL-7 signaling. p53 deficiency rescues the B cell developmental defect.\",\n      \"method\": \"Germline Rpl22 KO mice, flow cytometry, IL-7 signaling analysis, p53 KO epistasis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific developmental phenotype, negative result (not IL-7 signaling) plus positive epistasis (p53 rescue), extends established mechanism to B cell lineage\",\n      \"pmids\": [\"25416806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In S. cerevisiae, Rpl22A and Rpl22B are required for selective translation of IME1 mRNA through its unusually long 5'UTR, required for meiotic induction. Rpl22 maintains high free 60S subunit levels under conditions of high translational output, preventing halfmer formation. Deleting the IME1 5'UTR bypasses the requirement for Rpl22.\",\n      \"method\": \"Rpl22 yeast mutants, polysome profiling, 5'UTR deletion analysis, Ime1 protein level measurement, meiotic phenotype assays\",\n      \"journal\": \"Cell division\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic system, polysome profiling, 5'UTR deletion rescue; yeast ortholog with well-conserved function\",\n      \"pmids\": [\"27478489\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPL22 (eL22) is a component of the 60S ribosomal large subunit that, beyond its structural role in ribosome assembly (where its beta-hairpin lines the peptide exit tunnel and interacts with 23S/28S rRNA), performs multiple extraribosomal regulatory functions: it binds EBV EBER1 RNA at three stem-loop sites causing nucleoplasmic relocalization; it post-transcriptionally represses p53 mRNA translation (activated by Miz-1), thereby controlling lymphocyte development; it binds MDM2's acidic domain to inhibit MDM2-mediated p53 ubiquitination and degradation; it translocates to the nucleus to regulate pre-mRNA splicing of smad2 (opposing its paralog RPL22L1) and MDM4; it inhibits CDK4-Cyclin D1 as ribosome-free protein to enforce cell cycle arrest; it binds CCL2 mRNA 5'UTR to post-transcriptionally repress CCL2 during inflammation; and it controls ribosome heterogeneity by directly repressing its paralog RPL22L1 mRNA through hairpin binding.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPL22 (eL22) is a component of the 60S ribosomal large subunit that doubles as a sequence-specific RNA-binding protein with extensive extraribosomal regulatory functions in development, stress responses, and tumor suppression [#2, #13]. Within the ribosome its protruding beta-hairpin lines the polypeptide exit tunnel and contacts 23S/28S rRNA; mutations in this hairpin remodel the tunnel and confer macrolide resistance [#6, #9, #10], and high-affinity rRNA binding through basic residues 80-93 drives both nucleolar accumulation and ribosome incorporation [#14]. Independently of the ribosome, RPL22 recognizes a stem-loop RNA motif defined by SELEX [#4], first identified through its binding to three stem-loops of the EBV non-coding RNA EBER1, which relocalizes RPL22 from the nucleolus to the nucleoplasm and promotes lymphoma cell growth [#1, #12, #15]. A dominant physiological role is restraint of p53: RPL22 post-transcriptionally represses p53 mRNA translation—an activity transcriptionally driven by Miz-1—to protect lymphoid progenitors undergoing V(D)J recombination, and germline Rpl22 loss triggers p53-dependent, PUMA/Bim-mediated arrest of alphabeta T cell and pro-B cell development at lineage-specific checkpoints, in part via PERK-coupled ER stress [#13, #18, #28, #29, #19]. RPL22 also acts as a nuclear splicing regulator, binding intronic and exonic sequences of smad2 and MDM4 pre-mRNAs to control Nodal/TGF-beta signaling and MDM4 isoform output in functional antagonism with its paralog RPL22L1, whose expression RPL22 directly represses to govern ribosome heterogeneity [#22, #25, #17]. Loss-of-function in lymphoid cells is oncogenic, inducing the stemness factor Lin28B and accelerating thymic lymphoma [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established the protein's existence as a discrete cellular RNA-binding factor (EAP) physically associated with EBV small RNAs, before its ribosomal identity was known.\",\n      \"evidence\": \"Protein purification, cDNA cloning, and RNA co-immunoprecipitation of EBER1/EBER2-associated protein\",\n      \"pmids\": [\"1846807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify EAP as ribosomal protein L22\", \"Functional consequence of EBER binding unknown\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Demonstrated that RNA recognition is direct and sequence-specific, mapping binding to a defined EBER1 stem-loop without requiring other factors.\",\n      \"evidence\": \"Gel-shift and RNase protection with recombinant GST-EAP, EBER1 mutational analysis\",\n      \"pmids\": [\"8380232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular RNA ligands beyond EBER1 not yet defined\", \"No consensus binding motif\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Resolved that EAP is ribosomal protein L22 and showed EBER1 binding redistributes a pool of L22 to the nucleoplasm, defining its dual ribosomal/extraribosomal nature.\",\n      \"evidence\": \"Immunofluorescence, subcellular fractionation, in situ hybridization, in vitro binding; plus independent heparin-affinity identification as HBp15\",\n      \"pmids\": [\"8159770\", \"8135813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism partitioning L22 between ribosome and EBER1 RNP unclear\", \"Whether relocalized L22 has a function not addressed\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defined a general stem-loop RNA recognition motif for L22 and identified a cellular 28S rRNA ligand, generalizing its RNA-binding specificity beyond EBER1.\",\n      \"evidence\": \"SELEX, cDNA-SELEX, and mobility shift assays\",\n      \"pmids\": [\"7494316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mRNA targets not yet identified\", \"Functional readout of motif binding absent\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Determined the L22 fold and localized the antibiotic-resistance-conferring beta-hairpin, linking protein structure to the ribosome exit tunnel.\",\n      \"evidence\": \"X-ray crystallography of T. thermophilus L22\",\n      \"pmids\": [\"9862810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of hairpin in intact ribosome not shown\", \"Mammalian structural details inferred from bacterial protein\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected L22 hairpin geometry to tunnel architecture by showing a resistance-conferring deletion bends the hairpin into the tunnel, and cryo-EM linked L22/L4 to a dynamic multi-exit tunnel system.\",\n      \"evidence\": \"X-ray crystallography of L22 mutant, chemical rRNA probing, cryo-EM of resistant 70S ribosomes\",\n      \"pmids\": [\"12225755\", \"10369764\", \"11511371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of tunnel gating for nascent chains not defined\", \"Bacterial system; mammalian relevance assumed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed that RNA binding (not a discrete signal) drives nucleolar localization and ribosome incorporation, unifying L22's RNA-recognition activity with its assembly behavior.\",\n      \"evidence\": \"Mutagenesis of residues 80-93 with RNA binding, GFP localization, and ribosome incorporation readouts; earlier import signal mapping\",\n      \"pmids\": [\"19390581\", \"11056215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same residues toggle between rRNA and mRNA targets unclear\", \"Regulation of ribosome-free pool not addressed here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed a physiological extraribosomal role: Rpl22 loss selectively arrests alphabeta T cell development via p53 induction, defining lineage-specific p53 control as a core function.\",\n      \"evidence\": \"Germline knockout mice with p53 epistasis and thymocyte death assays\",\n      \"pmids\": [\"17555992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of p53 upregulation not yet defined\", \"Why gammadelta lineage is spared unexplained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the molecular mechanism of p53 control—Miz-1 transcriptionally activates Rpl22, whose protein binds p53 mRNA to repress its translation in recombining lymphoid progenitors.\",\n      \"evidence\": \"ChIP, RNA-protein binding assays, p53 level analysis in Miz-1-deficient cells; earlier PUMA/Bim epistasis and B cell extension\",\n      \"pmids\": [\"25468973\", \"21690328\", \"25416806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding site on p53 mRNA not finely mapped\", \"Quantitative contribution of translational vs other control not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed an ER-stress/PERK axis upstream of p53 in the developmental arrest, refining how Rpl22 loss converges on p53 in a lineage-selective manner.\",\n      \"evidence\": \"Knockout mice, pharmacological ER stress, PERK knockdown, p53 readouts\",\n      \"pmids\": [\"27489283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rpl22 loss elevates ER stress mechanistically unclear\", \"Link between ribosomal change and PERK activation undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined how Rpl22 governs ribosome heterogeneity by directly repressing its paralog Rpl22l1 via hairpin binding, with compensatory Rpl22l1 incorporation upon loss.\",\n      \"evidence\": \"Knockout mice, RNA-binding assays, ribosome fractionation, knockdown rescue; later refined as cryptic-exon splicing repression\",\n      \"pmids\": [\"23990801\", \"39146182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of paralog-swapped ribosomes incompletely defined\", \"Whether repression is purely translational vs splicing-based clarified only later\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified RPL22 as a nuclear pre-mRNA splicing regulator acting antagonistically with RPL22L1 on smad2 to control Nodal/TGF-beta signaling, broadening its extraribosomal repertoire beyond p53.\",\n      \"evidence\": \"Nuclear fractionation, RIP on smad2 introns, splicing assays, hnRNP-A1 interaction, zebrafish morphogenesis; MDM2-binding p53 stabilization and CDK4-Cyclin D1 inhibition reported same era\",\n      \"pmids\": [\"28076796\", \"29207594\", \"30874462\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants directing RPL22 to specific introns unknown\", \"Stoichiometry and trigger of nuclear translocation undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended splicing control to MDM4 exon 6, linking RPL22 loss to MDM4 isoform switching, increased proliferation, and Nutlin-3a resistance, integrating its splicing and p53-axis roles.\",\n      \"evidence\": \"Splicing assays, loss-of-function frameshift mutants, isoform quantification, proliferation and drug-resistance assays\",\n      \"pmids\": [\"39146182\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding site on MDM4 pre-mRNA not mapped\", \"Single-lab; in vivo relevance to tumors not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed RPL22 post-transcriptionally represses CCL2 by binding its 5'UTR and recruiting UPF1 for cytoplasmic mRNA degradation, extending mRNA-target regulation to inflammation.\",\n      \"evidence\": \"RNA-binding assay, RPL22-UPF1 Co-IP, nuclear translocation and knockdown with monocyte migration readout\",\n      \"pmids\": [\"32383535\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reciprocal validation of UPF1 interaction limited\", \"Single lab; generality across inflammatory stimuli untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RPL22 selects among its many RNA targets (rRNA, viral non-coding RNAs, paralog mRNA, p53 mRNA, CCL2 mRNA, smad2/MDM4 pre-mRNAs) and how the ribosome-free pool is dynamically generated and directed between cytoplasmic translational repression and nuclear splicing remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model coupling ribosome occupancy to target choice\", \"Post-translational regulation of pool partitioning unknown\", \"Structural basis for distinguishing mRNA targets from rRNA undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 4, 12, 14, 17, 18, 22, 24]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [6, 9, 10, 14]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [17, 22, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [18, 21, 23, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [2, 3, 6, 14]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [2, 5, 14]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2, 15, 22, 24]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8, 22, 24]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 21, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [17, 22, 25, 24]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [23, 13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [13, 28, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [13, 22, 29]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [13, 29, 24]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"complexes\": [\"60S ribosomal large subunit\", \"EBER1 ribonucleoprotein particle\", \"MDM2/RPL5/RPL11/RPL22 complex\"],\n    \"partners\": [\"MDM2\", \"RPL5\", \"RPL11\", \"RPL22L1\", \"UPF1\", \"hnRNP-A1\", \"CDK4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}