{"gene":"EIF4G2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1997,"finding":"DAP5 (EIF4G2) was identified as a novel 97-kDa protein homologous to eIF4G that lacks the N-terminal eIF4E-binding domain; a dominant-negative C-terminal fragment (28 kDa miniprotein) protected HeLa cells from IFN-gamma-induced programmed cell death when expressed at low levels.","method":"Functional cDNA rescue screen in HeLa cells, full-length cDNA cloning, sequence analysis, transfection-based cell death assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue screen plus sequence-based domain analysis, single lab, two orthogonal approaches","pmids":["9032289"],"is_preprint":false},{"year":2000,"finding":"During apoptosis (Fas or p53 activation), DAP5 is cleaved by caspases at position 790, yielding an 86-kDa C-terminal isoform (DAP5/p86) that forms complexes with eIF4A and eIF3. An IRES element in the DAP5 5'UTR maintains DAP5 translation during apoptosis when cap-dependent translation is suppressed, and recombinant DAP5/p97 or DAP5/p86 enhanced translation through the DAP5 IRES in cell-free systems, establishing a positive feedback loop.","method":"Western blot caspase cleavage mapping, Co-IP (eIF4A, eIF3), bicistronic reporter assays, cell-free translation assays with recombinant protein, dominant-negative neutralization in reticulocyte lysates","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (cleavage mapping, Co-IP, in vitro translation reconstitution, bicistronic reporters) in a single rigorous study","pmids":["10611228"],"is_preprint":false},{"year":2000,"finding":"NAT1/DAP5 knockout mice die during gastrulation; NAT1-/- embryonic stem cells show impaired differentiation in response to retinoic acid and selectively reduced expression of retinoic acid-responsive genes (e.g., p21WAF1), without defects in global translation or proliferation in undifferentiated cells.","method":"Gene knockout in mice, ES cell differentiation assays, teratoma formation, gene expression profiling","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean in vivo knockout with specific phenotypic readout, confirmed in multiple differentiation paradigms","pmids":["11032820"],"is_preprint":false},{"year":2002,"finding":"The caspase-cleaved DAP5/p86 fragment, but not the eIF4GI M-FAG/p76 fragment, supports cap-independent IRES-mediated translation of apoptosis-related proteins including c-Myc, Apaf-1, DAP5, and XIAP. The C-terminal tail of DAP5/p97 exerts an inhibitory effect on cap-independent translation that is relieved by caspase cleavage.","method":"Transfection-based IRES reporter assays in cell culture, ectopic expression of DAP5 truncation constructs","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based reporter assays with multiple IRES constructs, single lab","pmids":["11943866"],"is_preprint":false},{"year":2002,"finding":"Caspase-cleaved apoptotic fragments of DAP5/p97 (p86) and eIF4GI correlate with activation of pro-death IRES elements during etoposide-induced apoptosis, while pro-survival IRES elements are active under milder stress, demonstrating that these fragments differentially regulate IRES translation based on stress severity.","method":"IRES reporter assays in cell culture under various stresses, Western blot of caspase cleavage products","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple stress conditions and reporter assays, single lab","pmids":["12458215"],"is_preprint":false},{"year":2006,"finding":"p97/DAP5 is recruited to ribosomes following growth factor stimulation, binds eIF2beta through its C-terminal domain, and localizes to ribosomes through its N-terminal MIF4G domain. Knockdown of p97 by RNAi decreases global translation rate, inhibits cell proliferation, increases p27/Kip1 protein, and decreases CDK2 kinase activity.","method":"RNAi knockdown, ribosome fractionation, domain mapping by overexpression of truncation constructs, Co-IP (eIF2beta), luciferase reporter assays, CDK2 kinase assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ribosome fractionation, Co-IP, RNAi with multiple readouts), single lab","pmids":["16932749"],"is_preprint":false},{"year":2007,"finding":"DAP5/p97 expression is selectively enhanced during ER stress by IRES-mediated translation of its own mRNA, providing a positive feedback loop. The full-length DAP5/p97 activates the HIAP2 IRES in a caspase-independent manner during ER stress, while HIAP2 IRES activation requires subsequent caspase-dependent proteolytic processing of DAP5/p97 to p86.","method":"Polysome profiling, bicistronic IRES reporter assays, caspase inhibitor experiments (z-VAD-fmk), Western blotting","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome profiling and reporter assays with pharmacological controls, single lab","pmids":["18003655"],"is_preprint":false},{"year":2008,"finding":"DAP5 knockdown induces M-phase-specific caspase-dependent apoptosis in non-stressed cells. Bcl-2 and CDK1 mRNAs are DAP5 translation targets (both containing functional IRES elements in their 5'UTRs); DAP5 knockdown shifts Bcl-2 mRNA to light polysomes and reduces CDK1-dependent phosphorylation of M-phase substrates. Ectopic expression of Bcl-2 or CDK1 partially rescues caspase activation caused by DAP5 knockdown.","method":"RNAi knockdown, polysome profiling, IRES reporter assays, flow cytometry (M-phase apoptosis), Western blot of CDK1 substrates, rescue by ectopic expression","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RNAi, polysome profiling, IRES reporters, rescue experiments) in single rigorous study","pmids":["18450493"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of the C-terminal region of DAP5/p97 (aa 730–897) reveals four HEAT repeats homologous to eIF4GI, eIF5, and eIF2Bepsilon. The loop connecting alpha3 and alpha4 (harboring the caspase cleavage site at position 792) lacks electron density and shows fewer stabilizing interactions, explaining caspase accessibility. The caspase cleavage removes a subdomain carrying acidic residues of the AA-box motif, likely altering protein–protein interactions (e.g., with eIF2beta).","method":"X-ray crystallography of C-terminal DAP5 domain (aa 730–897)","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with structural interpretation confirmed by prior mutagenesis data, single lab","pmids":["18722383"],"is_preprint":false},{"year":2008,"finding":"DAP5/p97 is induced by ATRA during granulocytic differentiation of APL cells, undergoes nuclear translocation, and its knockdown inhibits ATRA-induced differentiation and ATO-induced apoptosis. DAP5/p97 expression is upregulated by inhibition of the PI3K/Akt/mTOR pathway.","method":"siRNA knockdown, Western blot, immunofluorescence (nuclear translocation), PI3K/Akt/mTOR pathway inhibitors","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with specific cellular phenotypes, pharmacological pathway mapping, single lab","pmids":["18491231"],"is_preprint":false},{"year":2012,"finding":"NAT1/DAP5 knockdown in Drosophila circadian pacemaker neurons lengthens circadian period and dramatically reduces PER and BELLE protein levels, indicating that NAT1 promotes translation of per mRNA and belle mRNA (a NAT1 target). TOR kinase inhibition increases circadian oscillator activity in a NAT1-dependent manner, suggesting NAT1 mediates cap-independent translation relevant to the circadian oscillator.","method":"Targeted RNAi screen, circadian behavioral assays, immunostaining of PER and BELLE in PDF neurons, TOR inhibitor experiments","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown with specific behavioral and molecular phenotypes in Drosophila model, single lab","pmids":["22904033"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of the DAP5 MIF4G domain reveals overall HEAT-repeat solenoid fold similar to eIF4G, but with distinct surface properties. ITC quantification shows DAP5 binds eIF4A with ~10-fold lower affinity than eIF4G, and this reduced affinity attenuates eIF4A RNA helicase/unwinding activity stimulation in vitro.","method":"X-ray crystallography, isothermal titration calorimetry (ITC), in vitro RNA unwinding assay","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with quantitative binding (ITC) and in vitro functional assay","pmids":["23478064"],"is_preprint":false},{"year":2013,"finding":"DAP5 promotes IRES-driven translation of p53 mRNA, preferentially from the second IRES in the coding sequence that drives Δ40p53 isoform production. DAP5 knockdown shifts p53 mRNA to lighter polysomes. DAP5 directly binds p53 IRES elements in vitro (EMSA) and in vivo (RNA immunoprecipitation), representing the first demonstration of direct DAP5–mRNA binding.","method":"siRNA knockdown, bicistronic reporter assays, polysome profiling, EMSA (in vitro RNA binding), RNA immunoprecipitation (in vivo)","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (knockdown, reporters, polysome profiling, in vitro and in vivo RNA binding), single lab","pmids":["23318444"],"is_preprint":false},{"year":2015,"finding":"DAP5 associates with eIF2beta and eIF4AI to stimulate IRES-dependent translation of cellular mRNAs. DAP5 is dispensable for cap-dependent translation. These interactions were demonstrated by Co-IP and functional translation assays.","method":"Co-immunoprecipitation, siRNA knockdown, IRES reporter assays, in vitro translation assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of endogenous proteins plus orthogonal functional assays, replicated across two labs (Kimchi and Sonenberg)","pmids":["25779044"],"is_preprint":false},{"year":2015,"finding":"In Drosophila spermatogenesis, eIF4G2 (testes-specific) is required in early germ cells for proper meiotic divisions and spermatid elongation; abrogation in spermatocytes causes meiotic arrest. Double knockdown of eIF4G and eIF4G2 shows redundancy during early spermatogenesis. eIF4G2 has distinct, spatio-temporally restricted roles compared to canonical eIF4G.","method":"UAS-Gal4 RNAi knockdown in defined cell populations, male fertility assays, histological analysis of spermatogenesis stages","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic tissue-specific knockdown with multiple phenotypic readouts in Drosophila model, single lab","pmids":["25849588"],"is_preprint":false},{"year":2015,"finding":"Coxsackievirus B3 2A protease (not 3C) cleaves DAP5 at amino acid G434, generating 45-kDa N-terminal (DAP5-N) and 52-kDa C-terminal (DAP5-C) fragments. DAP5-N translocates to the nucleus at late infection timepoints while DAP5-C remains cytoplasmic. DAP5-N retains ability to drive IRES-dependent translation of pro-apoptotic p53 but not pro-survival Bcl-2, promotes CVB3 replication, while DAP5-C acts as dominant-negative for cap-dependent translation.","method":"Site-directed mutagenesis to map cleavage site, subcellular fractionation/immunofluorescence, IRES reporter assays, viral replication assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis-confirmed cleavage site plus localization and multiple functional assays","pmids":["26586572"],"is_preprint":false},{"year":2016,"finding":"DAP5 knockdown from human ESCs results in persistence of pluripotent gene expression, delayed induction of differentiation genes, defective embryoid body formation, and enhanced mislocalized apoptosis. Polysome-seq identified mitochondrial proteins involved in oxidative respiration as DAP5 translation targets; DAP5 KD cells show aberrant mitochondrial morphology and decreased oxidative respiratory activity. HMGN3 was identified as a cap-independent DAP5 translation target whose knockdown causes defective differentiation.","method":"siRNA/shRNA knockdown in hESCs, RNA sequencing of polysome-associated mRNAs, embryoid body assay, mitochondrial morphology imaging, respiration assays, IRES reporter assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide translatomics combined with functional validation and multiple orthogonal readouts in hESCs","pmids":["27664238"],"is_preprint":false},{"year":2018,"finding":"DAP5 binds eIF2beta via a PKC-Raf-ERK1/2 signal-dependent interaction that determines DAP5's influence on translation. DAP5 depletion causes a surge of HIF-1alpha by reducing translation of PHD2 (the oxygen-sensing prolyl hydroxylase that hydroxylates HIF-1alpha for degradation); this DAP5:eIF2beta-dependent PHD2 translation occurs during hypoxia-associated protein synthesis repression.","method":"Co-IP (DAP5:eIF2beta), siRNA knockdown of DAP5, Western blot of PHD2 and HIF-1alpha, pharmacological PKC/ERK signaling manipulation, hypoxia experiments","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus knockdown with specific translational target identified, single lab","pmids":["29530922"],"is_preprint":false},{"year":2019,"finding":"DAP5 is specifically required by type I IRES (CVB3) but not type II or type III IRES elements for cap-independent translation. DAP5 (but not full-length eIF4GI) facilitates initial-round translation of CVB3 input RNA, because DAP5 structurally resembles the C-terminal eIF4GI fragment produced by 2A protease cleavage. DAP5 and C-terminal eIF4GI bind the same region of CVB3 IRES but DAP5 has lower affinity.","method":"siRNA knockdown, IRES reporter assays for type I/II/III IRES, RNA binding assays, viral replication assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays with multiple IRES types plus RNA binding, single lab","pmids":["31455634"],"is_preprint":false},{"year":2019,"finding":"PCBP2 isoform f interacts with the 5'UTR of eIF4G2 mRNA and inhibits eIF4G2 translation in vitro and in cells. Reciprocally, eIF4G2 participates in cap-dependent translation of PCBP2 mRNA, forming a feedback loop between the translation factor and the RNA-binding protein.","method":"In vitro translation assays, PCBP2 isoform transfection, reporter assays, co-immunoprecipitation/RNA binding studies","journal":"RNA","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and cell-based assays confirming bidirectional regulation, single lab","pmids":["31010886"],"is_preprint":false},{"year":2019,"finding":"DAP5 enhances cap-independent translation of DSCR1.4 mRNA in hippocampal neurons, binds directly to the DSCR1.4 5'UTR, and promotes axonal outgrowth. BDNF stimulation increases DAP5 expression and DSCR1.4 cap-independent translation efficiency in both soma and axons.","method":"siRNA knockdown, bicistronic reporter assays, RNA binding (DSCR1.4 5'UTR), axon outgrowth measurement, BDNF stimulation experiments","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular target and direct RNA binding, single lab","pmids":["30718468"],"is_preprint":false},{"year":2020,"finding":"eIF4GI and DAP5 specifically bind to the 5'UTRs of cap-independently translated mRNAs (HIF-1alpha, FGF-9, p53) as demonstrated by fluorescence anisotropy binding studies. The binding affinity of eIF4GI and DAP5 to these 5'UTRs correlates with translation efficiency in vitro. The eIF4E-binding domain of eIF4GI increases binding affinity and selectivity among these mRNAs.","method":"Fluorescence anisotropy equilibrium binding, luciferase reporter-based in vitro translation assays, mutational analysis of 5'UTRs","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative binding and in vitro translation assays with mutational analysis, single lab","pmids":["32571876"],"is_preprint":false},{"year":2021,"finding":"TGF-beta-induced Treg cell differentiation utilizes a DAP5/eIF3d non-canonical cap-dependent (eIF4E-independent) translation mechanism. Treg cell mRNAs utilize DAP5 and eIF3d directed by 5' noncoding regions, while mTORC1/eIF4E/eIF4G-dependent translation of other T cell mRNAs is impaired. Silencing DAP5 in naive human CD4+ T cells impairs their differentiation into Treg cells.","method":"Genome-wide transcription and translation profiling (ribosome profiling), siRNA knockdown of DAP5 in primary human T cells, Treg differentiation assay, mTORC1 inhibition experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide translatomics plus primary cell loss-of-function, orthogonal methods, single lab","pmids":["34848685"],"is_preprint":false},{"year":2022,"finding":"eIF4G2 promotes scanning downstream of eIF4G1-mediated 40S recruitment; specifically, eIF4G2 facilitates leaky scanning for a subset of mRNAs containing translated uORFs. eIF4G2 appears to replace eIF4G1 during scanning when eIF4G1 dissociates from the scanning complex, e.g., when leaky scanning complexes interfere with ribosomes translating uORFs.","method":"Ribosome profiling upon eIF4G2 knockdown, luciferase reporters with uORF-containing 5'UTRs, mutational analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling combined with reporter-based mutational analysis, mechanistic model supported by multiple approaches","pmids":["35018467"],"is_preprint":false},{"year":2022,"finding":"DAP5-mediated translation occurs on mRNAs with long, structure-prone 5' leader sequences and persistent uORF translation. Cap/eIF4F- and eIF4A-dependent recruitment of DAP5 to mRNA facilitates main CDS but not uORF translation, suggesting a role for DAP5 in translation re-initiation. DAP5 target mRNAs preferentially encode signaling kinases and phosphatases.","method":"Ribosome profiling (DAP5 knockdown), luciferase reporters with mutational analysis, co-immunoprecipitation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling combined with reporter mutagenesis and mechanistic characterization, single lab but multiple orthogonal methods","pmids":["36473845"],"is_preprint":false},{"year":2022,"finding":"Ribosome profiling in DAP5 knockdown hESCs identified 68 mRNAs with decreased translation efficiency, including KMT2D. Nearly half of DAP5 target mRNAs contain actively translated uORFs upstream of the main coding sequence, consistent with DAP5 mediating leaky scanning through uORFs and/or reinitiation. CLIP experiments showed that direct DAP5–mRNA binding is a frequent but not absolute requirement for DAP5-dependent translation.","method":"Ribosome profiling, mass spectrometry (protein abundance), crosslinking immunoprecipitation (CLIP), siRNA knockdown in hESCs","journal":"RNA","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ribosome profiling, CLIP, and proteomics confirming targets, multiple orthogonal methods in single study","pmids":["35961752"],"is_preprint":false},{"year":2023,"finding":"DAP5/eIF3d forms a complex that mediates selective cap-dependent, eIF4E-independent translation of mRNAs encoding EMT transcription factors, cell migration integrins, metalloproteinases, and survival/angiogenesis factors. DAP5 is required for EMT, cell migration, invasion, metastasis, angiogenesis, and anoikis resistance in breast cancer, but not for primary tumor growth.","method":"Genome-wide transcriptomics and translatomics (translatome profiling), DAP5 knockdown in human and murine breast cancer models, Co-IP (DAP5/eIF3d complex), in vivo metastasis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide translatomics, Co-IP of complex, and in vivo functional studies with specific phenotypic readouts","pmids":["37314929"],"is_preprint":false},{"year":2023,"finding":"Loss-of-function cancer-associated missense mutations in EIF4G2 MIF4G domain selectively impair either protein–protein interactions or IRES-dependent translation initiation without affecting uORF-dependent translation. One mutation (R178Q) causes near-complete loss of EIF4G2 function and reduced protein expression.","method":"Functional assays of cancer-derived missense mutations, IRES reporter assays, protein–protein interaction assays (Co-IP/pulldown), uORF reporter assays","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis-based structure-function analysis with multiple functional readouts, single lab","pmids":["38129098"],"is_preprint":false},{"year":2023,"finding":"DAP5 knockdown in a Drosophila FXTAS model robustly suppresses CGG repeat-associated toxicity and inhibits RAN translation. Knockdown of initiation factors that preferentially associate with DAP5 (eIF2beta, eIF3F, eIF3G) also selectively suppresses CGG repeat-induced neurodegeneration, placing DAP5 and its interactors in the pathway of RAN translation initiation.","method":"Drosophila RNAi knockdown, eye degeneration scoring, RAN translation reporter assays, mammalian cellular reporter assays","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in Drosophila model with reporter assays, partially replicated in mammalian cells but with cell-type specific effects","pmids":["37352983"],"is_preprint":false},{"year":2023,"finding":"eIF4G2 facilitates PLEKHA1 protein translation via an IRES-dependent mechanism in hepatocellular carcinoma cells. EIF4G2 deletion suppresses tumor growth and metastasis in vitro and in vivo. PLEKHA1 was identified as a key translational product of EIF4G2 by polysome analysis and nascent protein synthesis assays; RIP and dual-luciferase reporter assays confirmed IRES-dependent mechanism.","method":"CRISPR/siRNA knockdown, polysome profiling, nascent protein synthesis assay, RNA immunoprecipitation (RIP), dual-luciferase reporter assay, in vivo xenograft","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods identifying a specific translational target with mechanistic confirmation, single lab","pmids":["39213495"],"is_preprint":false},{"year":2023,"finding":"eIF4G2 promotes translation of both POLGARF and POLG (from overlapping reading frames on the human POLG mRNA) by enhancing both leaky scanning and reinitiation downstream of a regulatory uORF. Ribosomes can acquire eIF4G2 during early reinitiation steps.","method":"Luciferase reporters with uORF-containing POLG 5'UTR, mutational analysis, siRNA knockdown, ribosome profiling","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter mutagenesis and knockdown with specific mechanistic conclusions, single lab","pmids":["38138978"],"is_preprint":false},{"year":2024,"finding":"Neuronal depolarization causes rapid reprogramming of dendritic translation accompanied by phosphorylation and recruitment of eIF4G2 to dendrites. eIF4G2 binds upstream open reading frames (uORFs) in pre-localized dendritic mRNAs, and the translated uORFs are sufficient to confer depolarization-induced, eIF4G2-dependent translational control of downstream coding sequences involved in long-term potentiation, cell signaling, and energy metabolism.","method":"Dendritically targeted proximity labeling (APEX), CLIP, ribosome profiling, mass spectrometry, reporter assays in primary cortical neurons, KCl/DHPG depolarization","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity labeling CLIP with ribosome profiling and reporter validation, multiple orthogonal methods in single study","pmids":["38589584"],"is_preprint":false},{"year":2024,"finding":"SHAPE-seq structural modeling of the FGF-9 5'UTR combined with DAP5 footprinting, toeprinting, and UV cross-linking identifies DAP5 binding to a tertiary structural face of the FGF-9 5'UTR near the start codon. DAP5 binding appears to involve tertiary RNA folding rather than a conserved sequence or secondary structure motif.","method":"SHAPE-seq, DAP5 RNA footprinting, toeprinting, UV cross-linking","journal":"RNA","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — structural probing combined with direct binding experiments, single lab","pmids":["38866431"],"is_preprint":false},{"year":2025,"finding":"eIF3d and eIF4G2 form a complex that recruits a subset of cap-structured mRNAs to ribosomes in an eIF4E-independent but cap-dependent manner. eIF3d binding to fully methylated 5' cap structure is quantitatively demonstrated; affinity of eIF3d and eIF3d/eIF4G2 complex binding to mRNA 5'UTRs correlates with translation efficiency, providing an alternative to canonical eIF4E-mediated initiation under cellular stress.","method":"Fluorescence anisotropy equilibrium binding (eIF3d and eIF3d/eIF4G2 to mRNA), in vitro translation assays, cap methylation manipulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative binding and in vitro translation, single lab","pmids":["39971159"],"is_preprint":false},{"year":2025,"finding":"SARS-CoV-2 NSP5 cleaves DAP5 at a specific site, producing an N-terminal fragment (DAP51-451) that translocates to the nucleus, interacts with p53, binds the CDKN1A locus to increase its expression (causing cell cycle arrest), and activates NF-κB/SASP, thereby driving virus-induced cellular senescence. Apoptosis-activated caspase-3 also cleaves DAP5 in a different positive feedback loop. Host TRIM7 E3 ligase targets DAP51-451 for glutamine C-degron-mediated ubiquitination and degradation, restricting viral replication.","method":"Western blot mapping of cleavage sites, FRET analysis, ChIP-seq, dual-luciferase reporter assays, Co-IP (DAP51-451 with p53), ubiquitination assays","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (ChIP-seq, Co-IP, reporter assays, ubiquitination assay), single lab, preprint not yet peer-reviewed","pmids":["41924271"],"is_preprint":false},{"year":2025,"finding":"Homozygous Dap5 deletion in Tregs causes spontaneous scurfy-like autoimmunity with intact thymic and peripheral development; Dap5 haploinsufficiency in Tregs preserves immune homeostasis while suppressing tumor growth. DAP5 mediates alternate translation of transcripts encoding CD25 and MCL-1 in Tregs, sustaining Treg lineage stability and survival in the tumor microenvironment.","method":"Conditional/homozygous Dap5 knockout mice (Treg-specific), tumor growth assays, CD8+ T cell infiltration analysis, ribosome profiling/translatomics in Tregs","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic loss-of-function with mechanistic translatomic evidence, single lab","pmids":["41457459"],"is_preprint":false},{"year":2025,"finding":"eIF4G2 directs CD8+ T cell lineage commitment by selectively enabling IL-7 receptor (IL-7R) signaling; T cell-specific eIF4G2 deletion abolishes CD8+ single-positive thymocyte lineage commitment while sparing CD4+ lineage. Mechanistically, eIF4G2 deficiency fails to sustain translation of the IL-7R gamma-chain (gamma-c) via a UTR-dependent mechanism, and also impairs IL-7Ralpha mRNA levels.","method":"T cell-specific conditional knockout mice, flow cytometry of thymic populations, IL-7 signaling assays, UTR-dependent reporter assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional knockout with specific developmental phenotype and mechanistic follow-up, single lab","pmids":["41940334"],"is_preprint":false},{"year":2025,"finding":"Genetic interaction screen in Drosophila identifies a functional interaction between Gemin3/Ddx20 and NAT1/eIF4G2; loss of NAT1 downregulates Gemin3 mRNA levels. Both factors share convergent transcriptome alterations including requirements in actin cytoskeleton organization, neurodevelopment (brain growth), and organism development, despite no direct physical association detected.","method":"Unbiased genetic screen in Drosophila, RNAi knockdown, transcriptome analysis, brain morphology imaging, muscle contraction assays","journal":"Developmental biology","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — genetic screen and transcriptomics, but no direct physical interaction and mechanism remains indirect","pmids":["39924071"],"is_preprint":false},{"year":2025,"finding":"eIF4G2 loss in adult mouse intestine (inducible knockout) collapses Lgr5+ intestinal stem cell and secretory maturation programs, activates a fetal-like/regenerative state with YAP-TEAD activation. Ribosome profiling reveals selective translation-efficiency loss among chromatin regulators, especially KAT3 coactivators CREBBP and EP300, resulting in reduced histone acetylation. CUT&Tag and ATAC-seq show eIF4G2-KAT3 output drives locus-selective enhancer remodeling.","method":"Inducible Eif4g2 knockout mice, intestinal organoids, ribosome profiling, single-nucleus multiome, CUT&Tag, ATAC-seq, KAT3 chemical inhibition","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout with ribosome profiling and genome-wide chromatin profiling, multiple orthogonal methods","pmids":["42066769"],"is_preprint":false},{"year":2026,"finding":"In vivo CRISPR/Cas9 screen identifies eIF4G2 as a translational checkpoint restraining pancreatic ductal adenocarcinoma (PDAC) progression. eIF4G2 loss accelerates tumor growth, promotes basal-like/poorly differentiated histology, and triggers widespread metastasis. Ribosome profiling reveals eIF4G2 selectively translates mRNAs with long, GC-rich, structured 5'UTRs including tumor suppressors Pten and Crebbp; eIF4G2 loss does not alter bulk protein synthesis.","method":"In vivo CRISPR/Cas9 screen, ribosome profiling, in vivo tumor models, patient-derived PDAC cell functional assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo CRISPR screen confirmed by ribosome profiling and patient-derived cell functional assays, multiple orthogonal approaches","pmids":["42202060"],"is_preprint":false},{"year":2024,"finding":"eIF4G2 also promotes translation termination in a reconstituted mammalian system; eIF4G2/DAP5 can stimulate the GTPase activity of eRF3 via its MIF4G domain, facilitating release factor dissociation after peptide release as part of a closed-loop mRNA structure.","method":"Reconstituted mammalian translation termination system, domain deletion analysis (MIF4G), eRF3 GTPase assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — reconstituted in vitro system with domain mapping, but preprint and single lab","pmids":["bio_10.1101_2024.09.10.612082"],"is_preprint":true}],"current_model":"EIF4G2 (DAP5/NAT1/p97) is a non-canonical eIF4G homolog that lacks the eIF4E-binding domain and functions as a selective translation initiation scaffold: it binds eIF4A (with ~10-fold lower affinity than eIF4G1), eIF2beta, and eIF3d to promote cap-independent IRES-mediated and uORF-bypass (leaky scanning/reinitiation) translation of a discrete regulon of mRNAs with long, structured 5'UTRs—including cell-cycle regulators (Bcl-2, CDK1), tumor suppressors (PTEN, CREBBP), and differentiation factors—while being dispensable for bulk cap-dependent translation; during apoptosis, caspase cleavage at position 790 generates a p86 fragment with enhanced IRES-stimulatory activity, and during neuronal activity, phosphorylation of eIF4G2 recruits it to dendritic uORF-containing mRNAs to couple depolarization to local protein synthesis."},"narrative":{"mechanistic_narrative":"EIF4G2 (DAP5/NAT1/p97) is a non-canonical eIF4G homolog that lacks the N-terminal eIF4E-binding domain and operates as a selective translation initiation scaffold for a discrete regulon of mRNAs, while being dispensable for bulk cap-dependent translation [PMID:9032289, PMID:25779044, PMID:27664238]. It assembles with core initiation machinery—binding eIF4A through its MIF4G domain (with ~10-fold lower affinity than eIF4G1, which attenuates eIF4A helicase stimulation), eIF2beta through its C-terminal HEAT-repeat region, and eIF3d—to drive translation of mRNAs bearing long, structured 5'UTRs and upstream open reading frames [PMID:16932749, PMID:23478064, PMID:25779044, PMID:36473845]. Mechanistically, EIF4G2 acts both through IRES-mediated cap-independent initiation, binding directly to structured 5'UTR elements (e.g., p53, FGF-9) via tertiary RNA folding rather than a defined sequence motif [PMID:23318444, PMID:38866431], and through eIF3d-dependent cap-dependent but eIF4E-independent recruitment, as well as by promoting leaky scanning and reinitiation downstream of translated uORFs—replacing eIF4G1 in scanning complexes when ribosomes encounter uORFs [PMID:35018467, PMID:36473845, PMID:39971159]. Its target regulon encodes cell-cycle and survival regulators (Bcl-2, CDK1, MCL-1), tumor suppressors (PTEN, CREBBP/EP300), signaling kinases and phosphatases, and differentiation and chromatin factors (HMGN3, KMT2D), coupling EIF4G2 to specific cellular programs [PMID:18450493, PMID:27664238, PMID:36473845, PMID:35961752, PMID:42066769, PMID:42202060]. Through this selective output, EIF4G2 is essential for embryonic development and stem-cell differentiation, controls oxidative respiration and mitochondrial gene programs, governs T-cell lineage commitment and regulatory T-cell stability, and functions as a translational checkpoint restraining tumor progression in breast, hepatocellular, pancreatic, and intestinal contexts [PMID:11032820, PMID:27664238, PMID:37314929, PMID:41457459, PMID:41940334, PMID:42066769, PMID:42202060]. During apoptosis, caspase cleavage at position 790 removes an inhibitory C-terminal subdomain to generate a p86 fragment with enhanced IRES-stimulatory activity, sustaining its own and pro-apoptotic protein synthesis when cap-dependent translation is suppressed [PMID:10611228, PMID:11943866, PMID:18722383]; viral proteases (coxsackievirus 2A, SARS-CoV-2 NSP5) likewise cleave EIF4G2 to redirect translation and, in the latter case, drive p53-dependent senescence [PMID:26586572, PMID:41924271]. During neuronal activity, depolarization triggers phosphorylation and dendritic recruitment of EIF4G2 to uORF-containing mRNAs, coupling stimulation to local protein synthesis [PMID:38589584].","teleology":[{"year":1997,"claim":"Established EIF4G2 as a distinct eIF4G-family protein, defining the structural basis for non-canonical function: it shares eIF4G homology but lacks the eIF4E-binding domain, and a dominant-negative fragment implicated it in cell-death regulation.","evidence":"Functional cDNA rescue screen and sequence analysis in HeLa cells, transfection-based death assays","pmids":["9032289"],"confidence":"Medium","gaps":["No direct demonstration of translation activity","Mechanism of death protection not resolved","No interaction partners mapped"]},{"year":2000,"claim":"Defined the apoptotic processing of EIF4G2 and a self-sustaining circuit: caspase cleavage at position 790 yields p86 that complexes with eIF4A and eIF3, and an IRES in the EIF4G2 5'UTR maintains its own synthesis when cap-dependent translation fails.","evidence":"Caspase cleavage mapping, Co-IP, bicistronic reporters, and cell-free translation with recombinant protein","pmids":["10611228"],"confidence":"High","gaps":["Identity of physiological IRES target mRNAs not defined","Quantitative contribution of p86 vs p97 unclear","Direct RNA binding not yet shown"]},{"year":2000,"claim":"Demonstrated EIF4G2 is essential in vivo and selectively required for differentiation programs rather than bulk translation, distinguishing it functionally from canonical eIF4G.","evidence":"Knockout mice (gastrulation lethality) and retinoic-acid differentiation assays in ES cells with expression profiling","pmids":["11032820"],"confidence":"High","gaps":["Specific mRNA targets driving differentiation phenotype not identified","Molecular basis of selectivity unknown"]},{"year":2002,"claim":"Showed the caspase-generated p86 fragment, but not the analogous eIF4GI fragment, supports IRES-driven translation of apoptotic regulators, and identified an autoinhibitory C-terminal tail relieved by cleavage.","evidence":"IRES reporter assays and truncation-construct expression in cell culture under multiple stresses","pmids":["11943866","12458215"],"confidence":"Medium","gaps":["Reporter-based; endogenous target regulation not quantified","Structural basis of autoinhibition not resolved at this stage","Single lab"]},{"year":2006,"claim":"Mapped the functional architecture and ribosomal engagement: the N-terminal MIF4G domain mediates ribosome localization, the C-terminus binds eIF2beta, and EIF4G2 supports proliferation through cell-cycle regulators.","evidence":"RNAi knockdown, ribosome fractionation, domain mapping, Co-IP of eIF2beta, and CDK2 kinase assays","pmids":["16932749"],"confidence":"High","gaps":["Reported global translation effect later refined to selective targets","Direct mRNA binding not demonstrated","Recruitment signal unknown"]},{"year":2008,"claim":"Identified Bcl-2 and CDK1 as physiological targets explaining why EIF4G2 loss triggers M-phase apoptosis, linking its selective translation output to cell survival and mitotic progression.","evidence":"RNAi, polysome profiling, IRES reporters, CDK1 substrate Westerns, and rescue by ectopic Bcl-2/CDK1","pmids":["18450493"],"confidence":"High","gaps":["Direct binding to Bcl-2/CDK1 5'UTRs not shown here","Full target regulon undefined"]},{"year":2008,"claim":"Provided structural rationale for caspase regulation: the C-terminal HEAT-repeat domain resembles eIF4GI/eIF5/eIF2Bepsilon, with a disordered, poorly stabilized loop at the cleavage site explaining protease accessibility and the loss of eIF2beta-interacting acidic residues upon cleavage.","evidence":"X-ray crystallography of the C-terminal domain (aa 730–897)","pmids":["18722383"],"confidence":"High","gaps":["Structure of the full-length protein and MIF4G not yet solved","RNA-binding surface not localized"]},{"year":2013,"claim":"Quantified the EIF4G2–eIF4A interaction and gave the first direct demonstration of EIF4G2–mRNA binding, establishing sequence-specific IRES recognition (p53) as part of its mechanism.","evidence":"MIF4G crystal structure with ITC and in vitro unwinding assays; EMSA and RNA immunoprecipitation for p53 IRES binding","pmids":["23478064","23318444"],"confidence":"High","gaps":["Generality of direct binding across targets not established at this point","Structural basis of RNA recognition unresolved"]},{"year":2015,"claim":"Consolidated the core initiation model—EIF4G2 partners with eIF2beta and eIF4AI to drive cellular IRES translation while being dispensable for cap-dependent translation—and revealed tissue-specific and signaling-gated roles plus species-conserved circadian and developmental functions.","evidence":"Co-IP and IRES/in vitro translation assays (human); Drosophila tissue-specific RNAi in spermatogenesis; earlier circadian RNAi in pacemaker neurons","pmids":["25779044","25849588","22904033"],"confidence":"High","gaps":["Genome-wide target set not yet defined","Mechanism distinguishing IRES vs scanning roles unresolved"]},{"year":2016,"claim":"Defined the genome-wide EIF4G2 translatome in human stem cells, linking it to mitochondrial/oxidative-respiration proteins and differentiation factors (HMGN3) and explaining the differentiation and apoptosis phenotypes of EIF4G2 loss.","evidence":"Polysome-seq, knockdown in hESCs, embryoid body and mitochondrial respiration assays, IRES reporters","pmids":["27664238"],"confidence":"High","gaps":["Distinction between direct and indirect targets incomplete","Initiation mechanism for each target class not parsed"]},{"year":2019,"claim":"Expanded the mechanism to additional physiological and viral contexts: signaling-gated eIF2beta binding, hypoxia-relevant PHD2 translation, neuronal axon-outgrowth control, viral-protease cleavage redirecting translation, and a PCBP2 regulatory feedback loop.","evidence":"Co-IP and knockdown with PHD2/HIF-1alpha readouts; DSCR1.4 5'UTR binding and axon assays; CVB3 2A cleavage mapping and type-I IRES dependence; PCBP2 in vitro translation assays","pmids":["29530922","30718468","26586572","31455634","31010886"],"confidence":"Medium","gaps":["Most single-lab; mechanistic generality across contexts uncertain","Phospho-sites and signaling inputs incompletely mapped"]},{"year":2021,"claim":"Established quantitative 5'UTR recognition correlating with translation efficiency and revealed a non-canonical cap-dependent, eIF4E-independent DAP5/eIF3d mechanism governing Treg differentiation.","evidence":"Fluorescence anisotropy 5'UTR binding (HIF-1alpha/FGF-9/p53) and in vitro translation; ribosome profiling and knockdown in primary human CD4+ T cells","pmids":["32571876","34848685"],"confidence":"High","gaps":["How EIF4G2/eIF3d selects cap-structured mRNAs not fully resolved","Relationship between IRES and cap-dependent modes unclear"]},{"year":2022,"claim":"Resolved a distinct scanning/reinitiation mechanism: EIF4G2 promotes leaky scanning and reinitiation downstream of translated uORFs on mRNAs with long structured leaders, replacing eIF4G1 in scanning complexes, with cap/eIF4F-dependent recruitment supporting main-CDS but not uORF translation.","evidence":"Ribosome profiling, uORF-containing luciferase reporters with mutational analysis, Co-IP, CLIP in hESCs","pmids":["35018467","36473845","35961752"],"confidence":"High","gaps":["Switch between IRES and scanning/reinitiation modes not mechanistically defined","Direct binding frequent but not absolutely required—determinants unclear"]},{"year":2023,"claim":"Tied EIF4G2-selective translation to disease: a DAP5/eIF3d complex drives EMT and metastasis programs, EIF4G2 supports HCC growth via PLEKHA1 IRES translation and FXTAS RAN translation, and cancer-associated MIF4G mutations dissociate its IRES versus uORF functions.","evidence":"Translatome profiling and Co-IP in breast cancer with in vivo metastasis assays; polysome/RIP in HCC; Drosophila FXTAS genetic epistasis; structure-function mutagenesis","pmids":["37314929","39213495","37352983","38129098"],"confidence":"High","gaps":["Functional separation of EIF4G2's mechanistic modes incompletely mapped to structure","Some disease links rest on single models"]},{"year":2024,"claim":"Extended EIF4G2's mechanism beyond initiation and into activity-dependent neuronal control: it stimulates eRF3 GTPase activity in translation termination via its MIF4G domain, and depolarization-driven phosphorylation recruits it to dendritic uORF-containing mRNAs for local synthesis.","evidence":"Reconstituted termination system with eRF3 GTPase assay (preprint); dendritic APEX proximity labeling, CLIP, ribosome profiling in cortical neurons","pmids":["bio_10.1101_2024.09.10.612082","38589584"],"confidence":"Medium","gaps":["Termination role from a single preprint, not peer-reviewed","Phosphorylation sites and responsible kinase not fully defined"]},{"year":2025,"claim":"Defined EIF4G2 as a tumor-restraining translational checkpoint and immune-lineage regulator in vivo, and characterized viral hijacking driving senescence: it selectively translates structured-5'UTR tumor suppressors (Pten, Crebbp/Ep300, KAT3 coactivators), sustains Treg and CD8 lineage programs, and SARS-CoV-2 NSP5 cleavage redirects DAP5 to a nuclear p53/CDKN1A-activating fragment countered by TRIM7.","evidence":"In vivo CRISPR screens and conditional knockouts (PDAC, intestine, Treg, T-cell) with ribosome profiling and chromatin profiling; cleavage mapping, ChIP-seq, Co-IP and ubiquitination assays for NSP5/TRIM7","pmids":["42202060","38138978","41457459","41940334","42066769","41924271"],"confidence":"High","gaps":["Mechanistic basis for tumor-context-dependent target selection incomplete","Some translatomic targets validated in single models"]},{"year":null,"claim":"How EIF4G2 chooses among its distinct mechanistic modes—IRES recognition, eIF3d-dependent cap-dependent recruitment, leaky-scanning/reinitiation, and termination—on a given target, and what signals or RNA features dictate that choice, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking 5'UTR structural features to a specific initiation mode","Phospho-regulation and cofactor switching incompletely mapped","No full-length structure of EIF4G2 on a target mRNA"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[12,20,21,25,32]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[1,5,13,23,24]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,13,26,33]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[34,38]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,15]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,15,34]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,5,13,24]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[12,23,25]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,3,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,16,36,38]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22,35,36]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[26,29,39]}],"complexes":["DAP5/eIF3d complex"],"partners":["EIF4A1","EIF2S2","EIF3D","PCBP2","ETF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P78344","full_name":"Eukaryotic translation initiation factor 4 gamma 2","aliases":["Death-associated protein 5","DAP-5","p97"],"length_aa":907,"mass_kda":102.4,"function":"Appears to play a role in the switch from cap-dependent to IRES-mediated translation during mitosis, apoptosis and viral infection. Cleaved by some caspases and viral proteases","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P78344/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/EIF4G2","classification":"Common Essential","n_dependent_lines":997,"n_total_lines":1208,"dependency_fraction":0.8253311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EIF3B","stoichiometry":4.0},{"gene":"EIF4A1","stoichiometry":0.2},{"gene":"METAP2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/EIF4G2","total_profiled":1310},"omim":[{"mim_id":"620759","title":"POLG ALTERNATIVE READING FRAME; POLGARF","url":"https://www.omim.org/entry/620759"},{"mim_id":"614392","title":"TUDOR DOMAIN-CONTAINING PROTEIN 3; TDRD3","url":"https://www.omim.org/entry/614392"},{"mim_id":"606724","title":"MITOGEN-ACTIVATED PROTEIN KINASE-INTERACTING SERINE/THREONINE KINASE 1; MKNK1","url":"https://www.omim.org/entry/606724"},{"mim_id":"602325","title":"EUKARYOTIC TRANSLATION INITIATION FACTOR 4-GAMMA, 2; EIF4G2","url":"https://www.omim.org/entry/602325"},{"mim_id":"174763","title":"POLYMERASE, DNA, GAMMA; POLG","url":"https://www.omim.org/entry/174763"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EIF4G2"},"hgnc":{"alias_symbol":["DAP5","NAT1","p97"],"prev_symbol":[]},"alphafold":{"accession":"P78344","domains":[{"cath_id":"1.25.40.180","chopping":"76-145_160-223","consensus_level":"high","plddt":85.0984,"start":76,"end":223},{"cath_id":"1.25.40.180","chopping":"540-726","consensus_level":"medium","plddt":93.9676,"start":540,"end":726},{"cath_id":"1.25.40.180","chopping":"728-786_798-904","consensus_level":"high","plddt":91.444,"start":728,"end":904}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P78344","model_url":"https://alphafold.ebi.ac.uk/files/AF-P78344-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P78344-F1-predicted_aligned_error_v6.png","plddt_mean":71.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EIF4G2","jax_strain_url":"https://www.jax.org/strain/search?query=EIF4G2"},"sequence":{"accession":"P78344","fasta_url":"https://rest.uniprot.org/uniprotkb/P78344.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P78344/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P78344"}},"corpus_meta":[{"pmid":"10226773","id":"PMC_10226773","title":"Delay-dependent 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rescue screen in HeLa cells, full-length cDNA cloning, sequence analysis, transfection-based cell death assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue screen plus sequence-based domain analysis, single lab, two orthogonal approaches\",\n      \"pmids\": [\"9032289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"During apoptosis (Fas or p53 activation), DAP5 is cleaved by caspases at position 790, yielding an 86-kDa C-terminal isoform (DAP5/p86) that forms complexes with eIF4A and eIF3. An IRES element in the DAP5 5'UTR maintains DAP5 translation during apoptosis when cap-dependent translation is suppressed, and recombinant DAP5/p97 or DAP5/p86 enhanced translation through the DAP5 IRES in cell-free systems, establishing a positive feedback loop.\",\n      \"method\": \"Western blot caspase cleavage mapping, Co-IP (eIF4A, eIF3), bicistronic reporter assays, cell-free translation assays with recombinant protein, dominant-negative neutralization in reticulocyte lysates\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (cleavage mapping, Co-IP, in vitro translation reconstitution, bicistronic reporters) in a single rigorous study\",\n      \"pmids\": [\"10611228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NAT1/DAP5 knockout mice die during gastrulation; NAT1-/- embryonic stem cells show impaired differentiation in response to retinoic acid and selectively reduced expression of retinoic acid-responsive genes (e.g., p21WAF1), without defects in global translation or proliferation in undifferentiated cells.\",\n      \"method\": \"Gene knockout in mice, ES cell differentiation assays, teratoma formation, gene expression profiling\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean in vivo knockout with specific phenotypic readout, confirmed in multiple differentiation paradigms\",\n      \"pmids\": [\"11032820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The caspase-cleaved DAP5/p86 fragment, but not the eIF4GI M-FAG/p76 fragment, supports cap-independent IRES-mediated translation of apoptosis-related proteins including c-Myc, Apaf-1, DAP5, and XIAP. The C-terminal tail of DAP5/p97 exerts an inhibitory effect on cap-independent translation that is relieved by caspase cleavage.\",\n      \"method\": \"Transfection-based IRES reporter assays in cell culture, ectopic expression of DAP5 truncation constructs\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based reporter assays with multiple IRES constructs, single lab\",\n      \"pmids\": [\"11943866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Caspase-cleaved apoptotic fragments of DAP5/p97 (p86) and eIF4GI correlate with activation of pro-death IRES elements during etoposide-induced apoptosis, while pro-survival IRES elements are active under milder stress, demonstrating that these fragments differentially regulate IRES translation based on stress severity.\",\n      \"method\": \"IRES reporter assays in cell culture under various stresses, Western blot of caspase cleavage products\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple stress conditions and reporter assays, single lab\",\n      \"pmids\": [\"12458215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p97/DAP5 is recruited to ribosomes following growth factor stimulation, binds eIF2beta through its C-terminal domain, and localizes to ribosomes through its N-terminal MIF4G domain. Knockdown of p97 by RNAi decreases global translation rate, inhibits cell proliferation, increases p27/Kip1 protein, and decreases CDK2 kinase activity.\",\n      \"method\": \"RNAi knockdown, ribosome fractionation, domain mapping by overexpression of truncation constructs, Co-IP (eIF2beta), luciferase reporter assays, CDK2 kinase assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ribosome fractionation, Co-IP, RNAi with multiple readouts), single lab\",\n      \"pmids\": [\"16932749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DAP5/p97 expression is selectively enhanced during ER stress by IRES-mediated translation of its own mRNA, providing a positive feedback loop. The full-length DAP5/p97 activates the HIAP2 IRES in a caspase-independent manner during ER stress, while HIAP2 IRES activation requires subsequent caspase-dependent proteolytic processing of DAP5/p97 to p86.\",\n      \"method\": \"Polysome profiling, bicistronic IRES reporter assays, caspase inhibitor experiments (z-VAD-fmk), Western blotting\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome profiling and reporter assays with pharmacological controls, single lab\",\n      \"pmids\": [\"18003655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DAP5 knockdown induces M-phase-specific caspase-dependent apoptosis in non-stressed cells. Bcl-2 and CDK1 mRNAs are DAP5 translation targets (both containing functional IRES elements in their 5'UTRs); DAP5 knockdown shifts Bcl-2 mRNA to light polysomes and reduces CDK1-dependent phosphorylation of M-phase substrates. Ectopic expression of Bcl-2 or CDK1 partially rescues caspase activation caused by DAP5 knockdown.\",\n      \"method\": \"RNAi knockdown, polysome profiling, IRES reporter assays, flow cytometry (M-phase apoptosis), Western blot of CDK1 substrates, rescue by ectopic expression\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RNAi, polysome profiling, IRES reporters, rescue experiments) in single rigorous study\",\n      \"pmids\": [\"18450493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of the C-terminal region of DAP5/p97 (aa 730–897) reveals four HEAT repeats homologous to eIF4GI, eIF5, and eIF2Bepsilon. The loop connecting alpha3 and alpha4 (harboring the caspase cleavage site at position 792) lacks electron density and shows fewer stabilizing interactions, explaining caspase accessibility. The caspase cleavage removes a subdomain carrying acidic residues of the AA-box motif, likely altering protein–protein interactions (e.g., with eIF2beta).\",\n      \"method\": \"X-ray crystallography of C-terminal DAP5 domain (aa 730–897)\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with structural interpretation confirmed by prior mutagenesis data, single lab\",\n      \"pmids\": [\"18722383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DAP5/p97 is induced by ATRA during granulocytic differentiation of APL cells, undergoes nuclear translocation, and its knockdown inhibits ATRA-induced differentiation and ATO-induced apoptosis. DAP5/p97 expression is upregulated by inhibition of the PI3K/Akt/mTOR pathway.\",\n      \"method\": \"siRNA knockdown, Western blot, immunofluorescence (nuclear translocation), PI3K/Akt/mTOR pathway inhibitors\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with specific cellular phenotypes, pharmacological pathway mapping, single lab\",\n      \"pmids\": [\"18491231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NAT1/DAP5 knockdown in Drosophila circadian pacemaker neurons lengthens circadian period and dramatically reduces PER and BELLE protein levels, indicating that NAT1 promotes translation of per mRNA and belle mRNA (a NAT1 target). TOR kinase inhibition increases circadian oscillator activity in a NAT1-dependent manner, suggesting NAT1 mediates cap-independent translation relevant to the circadian oscillator.\",\n      \"method\": \"Targeted RNAi screen, circadian behavioral assays, immunostaining of PER and BELLE in PDF neurons, TOR inhibitor experiments\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown with specific behavioral and molecular phenotypes in Drosophila model, single lab\",\n      \"pmids\": [\"22904033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of the DAP5 MIF4G domain reveals overall HEAT-repeat solenoid fold similar to eIF4G, but with distinct surface properties. ITC quantification shows DAP5 binds eIF4A with ~10-fold lower affinity than eIF4G, and this reduced affinity attenuates eIF4A RNA helicase/unwinding activity stimulation in vitro.\",\n      \"method\": \"X-ray crystallography, isothermal titration calorimetry (ITC), in vitro RNA unwinding assay\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with quantitative binding (ITC) and in vitro functional assay\",\n      \"pmids\": [\"23478064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DAP5 promotes IRES-driven translation of p53 mRNA, preferentially from the second IRES in the coding sequence that drives Δ40p53 isoform production. DAP5 knockdown shifts p53 mRNA to lighter polysomes. DAP5 directly binds p53 IRES elements in vitro (EMSA) and in vivo (RNA immunoprecipitation), representing the first demonstration of direct DAP5–mRNA binding.\",\n      \"method\": \"siRNA knockdown, bicistronic reporter assays, polysome profiling, EMSA (in vitro RNA binding), RNA immunoprecipitation (in vivo)\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (knockdown, reporters, polysome profiling, in vitro and in vivo RNA binding), single lab\",\n      \"pmids\": [\"23318444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DAP5 associates with eIF2beta and eIF4AI to stimulate IRES-dependent translation of cellular mRNAs. DAP5 is dispensable for cap-dependent translation. These interactions were demonstrated by Co-IP and functional translation assays.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, IRES reporter assays, in vitro translation assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of endogenous proteins plus orthogonal functional assays, replicated across two labs (Kimchi and Sonenberg)\",\n      \"pmids\": [\"25779044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In Drosophila spermatogenesis, eIF4G2 (testes-specific) is required in early germ cells for proper meiotic divisions and spermatid elongation; abrogation in spermatocytes causes meiotic arrest. Double knockdown of eIF4G and eIF4G2 shows redundancy during early spermatogenesis. eIF4G2 has distinct, spatio-temporally restricted roles compared to canonical eIF4G.\",\n      \"method\": \"UAS-Gal4 RNAi knockdown in defined cell populations, male fertility assays, histological analysis of spermatogenesis stages\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic tissue-specific knockdown with multiple phenotypic readouts in Drosophila model, single lab\",\n      \"pmids\": [\"25849588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Coxsackievirus B3 2A protease (not 3C) cleaves DAP5 at amino acid G434, generating 45-kDa N-terminal (DAP5-N) and 52-kDa C-terminal (DAP5-C) fragments. DAP5-N translocates to the nucleus at late infection timepoints while DAP5-C remains cytoplasmic. DAP5-N retains ability to drive IRES-dependent translation of pro-apoptotic p53 but not pro-survival Bcl-2, promotes CVB3 replication, while DAP5-C acts as dominant-negative for cap-dependent translation.\",\n      \"method\": \"Site-directed mutagenesis to map cleavage site, subcellular fractionation/immunofluorescence, IRES reporter assays, viral replication assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis-confirmed cleavage site plus localization and multiple functional assays\",\n      \"pmids\": [\"26586572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DAP5 knockdown from human ESCs results in persistence of pluripotent gene expression, delayed induction of differentiation genes, defective embryoid body formation, and enhanced mislocalized apoptosis. Polysome-seq identified mitochondrial proteins involved in oxidative respiration as DAP5 translation targets; DAP5 KD cells show aberrant mitochondrial morphology and decreased oxidative respiratory activity. HMGN3 was identified as a cap-independent DAP5 translation target whose knockdown causes defective differentiation.\",\n      \"method\": \"siRNA/shRNA knockdown in hESCs, RNA sequencing of polysome-associated mRNAs, embryoid body assay, mitochondrial morphology imaging, respiration assays, IRES reporter assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide translatomics combined with functional validation and multiple orthogonal readouts in hESCs\",\n      \"pmids\": [\"27664238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DAP5 binds eIF2beta via a PKC-Raf-ERK1/2 signal-dependent interaction that determines DAP5's influence on translation. DAP5 depletion causes a surge of HIF-1alpha by reducing translation of PHD2 (the oxygen-sensing prolyl hydroxylase that hydroxylates HIF-1alpha for degradation); this DAP5:eIF2beta-dependent PHD2 translation occurs during hypoxia-associated protein synthesis repression.\",\n      \"method\": \"Co-IP (DAP5:eIF2beta), siRNA knockdown of DAP5, Western blot of PHD2 and HIF-1alpha, pharmacological PKC/ERK signaling manipulation, hypoxia experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus knockdown with specific translational target identified, single lab\",\n      \"pmids\": [\"29530922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DAP5 is specifically required by type I IRES (CVB3) but not type II or type III IRES elements for cap-independent translation. DAP5 (but not full-length eIF4GI) facilitates initial-round translation of CVB3 input RNA, because DAP5 structurally resembles the C-terminal eIF4GI fragment produced by 2A protease cleavage. DAP5 and C-terminal eIF4GI bind the same region of CVB3 IRES but DAP5 has lower affinity.\",\n      \"method\": \"siRNA knockdown, IRES reporter assays for type I/II/III IRES, RNA binding assays, viral replication assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays with multiple IRES types plus RNA binding, single lab\",\n      \"pmids\": [\"31455634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PCBP2 isoform f interacts with the 5'UTR of eIF4G2 mRNA and inhibits eIF4G2 translation in vitro and in cells. Reciprocally, eIF4G2 participates in cap-dependent translation of PCBP2 mRNA, forming a feedback loop between the translation factor and the RNA-binding protein.\",\n      \"method\": \"In vitro translation assays, PCBP2 isoform transfection, reporter assays, co-immunoprecipitation/RNA binding studies\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and cell-based assays confirming bidirectional regulation, single lab\",\n      \"pmids\": [\"31010886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DAP5 enhances cap-independent translation of DSCR1.4 mRNA in hippocampal neurons, binds directly to the DSCR1.4 5'UTR, and promotes axonal outgrowth. BDNF stimulation increases DAP5 expression and DSCR1.4 cap-independent translation efficiency in both soma and axons.\",\n      \"method\": \"siRNA knockdown, bicistronic reporter assays, RNA binding (DSCR1.4 5'UTR), axon outgrowth measurement, BDNF stimulation experiments\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular target and direct RNA binding, single lab\",\n      \"pmids\": [\"30718468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"eIF4GI and DAP5 specifically bind to the 5'UTRs of cap-independently translated mRNAs (HIF-1alpha, FGF-9, p53) as demonstrated by fluorescence anisotropy binding studies. The binding affinity of eIF4GI and DAP5 to these 5'UTRs correlates with translation efficiency in vitro. The eIF4E-binding domain of eIF4GI increases binding affinity and selectivity among these mRNAs.\",\n      \"method\": \"Fluorescence anisotropy equilibrium binding, luciferase reporter-based in vitro translation assays, mutational analysis of 5'UTRs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative binding and in vitro translation assays with mutational analysis, single lab\",\n      \"pmids\": [\"32571876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TGF-beta-induced Treg cell differentiation utilizes a DAP5/eIF3d non-canonical cap-dependent (eIF4E-independent) translation mechanism. Treg cell mRNAs utilize DAP5 and eIF3d directed by 5' noncoding regions, while mTORC1/eIF4E/eIF4G-dependent translation of other T cell mRNAs is impaired. Silencing DAP5 in naive human CD4+ T cells impairs their differentiation into Treg cells.\",\n      \"method\": \"Genome-wide transcription and translation profiling (ribosome profiling), siRNA knockdown of DAP5 in primary human T cells, Treg differentiation assay, mTORC1 inhibition experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide translatomics plus primary cell loss-of-function, orthogonal methods, single lab\",\n      \"pmids\": [\"34848685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"eIF4G2 promotes scanning downstream of eIF4G1-mediated 40S recruitment; specifically, eIF4G2 facilitates leaky scanning for a subset of mRNAs containing translated uORFs. eIF4G2 appears to replace eIF4G1 during scanning when eIF4G1 dissociates from the scanning complex, e.g., when leaky scanning complexes interfere with ribosomes translating uORFs.\",\n      \"method\": \"Ribosome profiling upon eIF4G2 knockdown, luciferase reporters with uORF-containing 5'UTRs, mutational analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling combined with reporter-based mutational analysis, mechanistic model supported by multiple approaches\",\n      \"pmids\": [\"35018467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DAP5-mediated translation occurs on mRNAs with long, structure-prone 5' leader sequences and persistent uORF translation. Cap/eIF4F- and eIF4A-dependent recruitment of DAP5 to mRNA facilitates main CDS but not uORF translation, suggesting a role for DAP5 in translation re-initiation. DAP5 target mRNAs preferentially encode signaling kinases and phosphatases.\",\n      \"method\": \"Ribosome profiling (DAP5 knockdown), luciferase reporters with mutational analysis, co-immunoprecipitation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling combined with reporter mutagenesis and mechanistic characterization, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"36473845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Ribosome profiling in DAP5 knockdown hESCs identified 68 mRNAs with decreased translation efficiency, including KMT2D. Nearly half of DAP5 target mRNAs contain actively translated uORFs upstream of the main coding sequence, consistent with DAP5 mediating leaky scanning through uORFs and/or reinitiation. CLIP experiments showed that direct DAP5–mRNA binding is a frequent but not absolute requirement for DAP5-dependent translation.\",\n      \"method\": \"Ribosome profiling, mass spectrometry (protein abundance), crosslinking immunoprecipitation (CLIP), siRNA knockdown in hESCs\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ribosome profiling, CLIP, and proteomics confirming targets, multiple orthogonal methods in single study\",\n      \"pmids\": [\"35961752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DAP5/eIF3d forms a complex that mediates selective cap-dependent, eIF4E-independent translation of mRNAs encoding EMT transcription factors, cell migration integrins, metalloproteinases, and survival/angiogenesis factors. DAP5 is required for EMT, cell migration, invasion, metastasis, angiogenesis, and anoikis resistance in breast cancer, but not for primary tumor growth.\",\n      \"method\": \"Genome-wide transcriptomics and translatomics (translatome profiling), DAP5 knockdown in human and murine breast cancer models, Co-IP (DAP5/eIF3d complex), in vivo metastasis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide translatomics, Co-IP of complex, and in vivo functional studies with specific phenotypic readouts\",\n      \"pmids\": [\"37314929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss-of-function cancer-associated missense mutations in EIF4G2 MIF4G domain selectively impair either protein–protein interactions or IRES-dependent translation initiation without affecting uORF-dependent translation. One mutation (R178Q) causes near-complete loss of EIF4G2 function and reduced protein expression.\",\n      \"method\": \"Functional assays of cancer-derived missense mutations, IRES reporter assays, protein–protein interaction assays (Co-IP/pulldown), uORF reporter assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis-based structure-function analysis with multiple functional readouts, single lab\",\n      \"pmids\": [\"38129098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DAP5 knockdown in a Drosophila FXTAS model robustly suppresses CGG repeat-associated toxicity and inhibits RAN translation. Knockdown of initiation factors that preferentially associate with DAP5 (eIF2beta, eIF3F, eIF3G) also selectively suppresses CGG repeat-induced neurodegeneration, placing DAP5 and its interactors in the pathway of RAN translation initiation.\",\n      \"method\": \"Drosophila RNAi knockdown, eye degeneration scoring, RAN translation reporter assays, mammalian cellular reporter assays\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in Drosophila model with reporter assays, partially replicated in mammalian cells but with cell-type specific effects\",\n      \"pmids\": [\"37352983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"eIF4G2 facilitates PLEKHA1 protein translation via an IRES-dependent mechanism in hepatocellular carcinoma cells. EIF4G2 deletion suppresses tumor growth and metastasis in vitro and in vivo. PLEKHA1 was identified as a key translational product of EIF4G2 by polysome analysis and nascent protein synthesis assays; RIP and dual-luciferase reporter assays confirmed IRES-dependent mechanism.\",\n      \"method\": \"CRISPR/siRNA knockdown, polysome profiling, nascent protein synthesis assay, RNA immunoprecipitation (RIP), dual-luciferase reporter assay, in vivo xenograft\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods identifying a specific translational target with mechanistic confirmation, single lab\",\n      \"pmids\": [\"39213495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"eIF4G2 promotes translation of both POLGARF and POLG (from overlapping reading frames on the human POLG mRNA) by enhancing both leaky scanning and reinitiation downstream of a regulatory uORF. Ribosomes can acquire eIF4G2 during early reinitiation steps.\",\n      \"method\": \"Luciferase reporters with uORF-containing POLG 5'UTR, mutational analysis, siRNA knockdown, ribosome profiling\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter mutagenesis and knockdown with specific mechanistic conclusions, single lab\",\n      \"pmids\": [\"38138978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Neuronal depolarization causes rapid reprogramming of dendritic translation accompanied by phosphorylation and recruitment of eIF4G2 to dendrites. eIF4G2 binds upstream open reading frames (uORFs) in pre-localized dendritic mRNAs, and the translated uORFs are sufficient to confer depolarization-induced, eIF4G2-dependent translational control of downstream coding sequences involved in long-term potentiation, cell signaling, and energy metabolism.\",\n      \"method\": \"Dendritically targeted proximity labeling (APEX), CLIP, ribosome profiling, mass spectrometry, reporter assays in primary cortical neurons, KCl/DHPG depolarization\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity labeling CLIP with ribosome profiling and reporter validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"38589584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SHAPE-seq structural modeling of the FGF-9 5'UTR combined with DAP5 footprinting, toeprinting, and UV cross-linking identifies DAP5 binding to a tertiary structural face of the FGF-9 5'UTR near the start codon. DAP5 binding appears to involve tertiary RNA folding rather than a conserved sequence or secondary structure motif.\",\n      \"method\": \"SHAPE-seq, DAP5 RNA footprinting, toeprinting, UV cross-linking\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural probing combined with direct binding experiments, single lab\",\n      \"pmids\": [\"38866431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"eIF3d and eIF4G2 form a complex that recruits a subset of cap-structured mRNAs to ribosomes in an eIF4E-independent but cap-dependent manner. eIF3d binding to fully methylated 5' cap structure is quantitatively demonstrated; affinity of eIF3d and eIF3d/eIF4G2 complex binding to mRNA 5'UTRs correlates with translation efficiency, providing an alternative to canonical eIF4E-mediated initiation under cellular stress.\",\n      \"method\": \"Fluorescence anisotropy equilibrium binding (eIF3d and eIF3d/eIF4G2 to mRNA), in vitro translation assays, cap methylation manipulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative binding and in vitro translation, single lab\",\n      \"pmids\": [\"39971159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SARS-CoV-2 NSP5 cleaves DAP5 at a specific site, producing an N-terminal fragment (DAP51-451) that translocates to the nucleus, interacts with p53, binds the CDKN1A locus to increase its expression (causing cell cycle arrest), and activates NF-κB/SASP, thereby driving virus-induced cellular senescence. Apoptosis-activated caspase-3 also cleaves DAP5 in a different positive feedback loop. Host TRIM7 E3 ligase targets DAP51-451 for glutamine C-degron-mediated ubiquitination and degradation, restricting viral replication.\",\n      \"method\": \"Western blot mapping of cleavage sites, FRET analysis, ChIP-seq, dual-luciferase reporter assays, Co-IP (DAP51-451 with p53), ubiquitination assays\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (ChIP-seq, Co-IP, reporter assays, ubiquitination assay), single lab, preprint not yet peer-reviewed\",\n      \"pmids\": [\"41924271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Homozygous Dap5 deletion in Tregs causes spontaneous scurfy-like autoimmunity with intact thymic and peripheral development; Dap5 haploinsufficiency in Tregs preserves immune homeostasis while suppressing tumor growth. DAP5 mediates alternate translation of transcripts encoding CD25 and MCL-1 in Tregs, sustaining Treg lineage stability and survival in the tumor microenvironment.\",\n      \"method\": \"Conditional/homozygous Dap5 knockout mice (Treg-specific), tumor growth assays, CD8+ T cell infiltration analysis, ribosome profiling/translatomics in Tregs\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic loss-of-function with mechanistic translatomic evidence, single lab\",\n      \"pmids\": [\"41457459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"eIF4G2 directs CD8+ T cell lineage commitment by selectively enabling IL-7 receptor (IL-7R) signaling; T cell-specific eIF4G2 deletion abolishes CD8+ single-positive thymocyte lineage commitment while sparing CD4+ lineage. Mechanistically, eIF4G2 deficiency fails to sustain translation of the IL-7R gamma-chain (gamma-c) via a UTR-dependent mechanism, and also impairs IL-7Ralpha mRNA levels.\",\n      \"method\": \"T cell-specific conditional knockout mice, flow cytometry of thymic populations, IL-7 signaling assays, UTR-dependent reporter assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional knockout with specific developmental phenotype and mechanistic follow-up, single lab\",\n      \"pmids\": [\"41940334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Genetic interaction screen in Drosophila identifies a functional interaction between Gemin3/Ddx20 and NAT1/eIF4G2; loss of NAT1 downregulates Gemin3 mRNA levels. Both factors share convergent transcriptome alterations including requirements in actin cytoskeleton organization, neurodevelopment (brain growth), and organism development, despite no direct physical association detected.\",\n      \"method\": \"Unbiased genetic screen in Drosophila, RNAi knockdown, transcriptome analysis, brain morphology imaging, muscle contraction assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic screen and transcriptomics, but no direct physical interaction and mechanism remains indirect\",\n      \"pmids\": [\"39924071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"eIF4G2 loss in adult mouse intestine (inducible knockout) collapses Lgr5+ intestinal stem cell and secretory maturation programs, activates a fetal-like/regenerative state with YAP-TEAD activation. Ribosome profiling reveals selective translation-efficiency loss among chromatin regulators, especially KAT3 coactivators CREBBP and EP300, resulting in reduced histone acetylation. CUT&Tag and ATAC-seq show eIF4G2-KAT3 output drives locus-selective enhancer remodeling.\",\n      \"method\": \"Inducible Eif4g2 knockout mice, intestinal organoids, ribosome profiling, single-nucleus multiome, CUT&Tag, ATAC-seq, KAT3 chemical inhibition\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout with ribosome profiling and genome-wide chromatin profiling, multiple orthogonal methods\",\n      \"pmids\": [\"42066769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In vivo CRISPR/Cas9 screen identifies eIF4G2 as a translational checkpoint restraining pancreatic ductal adenocarcinoma (PDAC) progression. eIF4G2 loss accelerates tumor growth, promotes basal-like/poorly differentiated histology, and triggers widespread metastasis. Ribosome profiling reveals eIF4G2 selectively translates mRNAs with long, GC-rich, structured 5'UTRs including tumor suppressors Pten and Crebbp; eIF4G2 loss does not alter bulk protein synthesis.\",\n      \"method\": \"In vivo CRISPR/Cas9 screen, ribosome profiling, in vivo tumor models, patient-derived PDAC cell functional assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo CRISPR screen confirmed by ribosome profiling and patient-derived cell functional assays, multiple orthogonal approaches\",\n      \"pmids\": [\"42202060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"eIF4G2 also promotes translation termination in a reconstituted mammalian system; eIF4G2/DAP5 can stimulate the GTPase activity of eRF3 via its MIF4G domain, facilitating release factor dissociation after peptide release as part of a closed-loop mRNA structure.\",\n      \"method\": \"Reconstituted mammalian translation termination system, domain deletion analysis (MIF4G), eRF3 GTPase assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — reconstituted in vitro system with domain mapping, but preprint and single lab\",\n      \"pmids\": [\"bio_10.1101_2024.09.10.612082\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"EIF4G2 (DAP5/NAT1/p97) is a non-canonical eIF4G homolog that lacks the eIF4E-binding domain and functions as a selective translation initiation scaffold: it binds eIF4A (with ~10-fold lower affinity than eIF4G1), eIF2beta, and eIF3d to promote cap-independent IRES-mediated and uORF-bypass (leaky scanning/reinitiation) translation of a discrete regulon of mRNAs with long, structured 5'UTRs—including cell-cycle regulators (Bcl-2, CDK1), tumor suppressors (PTEN, CREBBP), and differentiation factors—while being dispensable for bulk cap-dependent translation; during apoptosis, caspase cleavage at position 790 generates a p86 fragment with enhanced IRES-stimulatory activity, and during neuronal activity, phosphorylation of eIF4G2 recruits it to dendritic uORF-containing mRNAs to couple depolarization to local protein synthesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EIF4G2 (DAP5/NAT1/p97) is a non-canonical eIF4G homolog that lacks the N-terminal eIF4E-binding domain and operates as a selective translation initiation scaffold for a discrete regulon of mRNAs, while being dispensable for bulk cap-dependent translation [#0, #13, #16]. It assembles with core initiation machinery—binding eIF4A through its MIF4G domain (with ~10-fold lower affinity than eIF4G1, which attenuates eIF4A helicase stimulation), eIF2beta through its C-terminal HEAT-repeat region, and eIF3d—to drive translation of mRNAs bearing long, structured 5'UTRs and upstream open reading frames [#5, #11, #13, #24]. Mechanistically, EIF4G2 acts both through IRES-mediated cap-independent initiation, binding directly to structured 5'UTR elements (e.g., p53, FGF-9) via tertiary RNA folding rather than a defined sequence motif [#12, #32], and through eIF3d-dependent cap-dependent but eIF4E-independent recruitment, as well as by promoting leaky scanning and reinitiation downstream of translated uORFs—replacing eIF4G1 in scanning complexes when ribosomes encounter uORFs [#23, #24, #33]. Its target regulon encodes cell-cycle and survival regulators (Bcl-2, CDK1, MCL-1), tumor suppressors (PTEN, CREBBP/EP300), signaling kinases and phosphatases, and differentiation and chromatin factors (HMGN3, KMT2D), coupling EIF4G2 to specific cellular programs [#7, #16, #24, #25, #38, #39]. Through this selective output, EIF4G2 is essential for embryonic development and stem-cell differentiation, controls oxidative respiration and mitochondrial gene programs, governs T-cell lineage commitment and regulatory T-cell stability, and functions as a translational checkpoint restraining tumor progression in breast, hepatocellular, pancreatic, and intestinal contexts [#2, #16, #26, #35, #36, #38, #39]. During apoptosis, caspase cleavage at position 790 removes an inhibitory C-terminal subdomain to generate a p86 fragment with enhanced IRES-stimulatory activity, sustaining its own and pro-apoptotic protein synthesis when cap-dependent translation is suppressed [#1, #3, #8]; viral proteases (coxsackievirus 2A, SARS-CoV-2 NSP5) likewise cleave EIF4G2 to redirect translation and, in the latter case, drive p53-dependent senescence [#15, #34]. During neuronal activity, depolarization triggers phosphorylation and dendritic recruitment of EIF4G2 to uORF-containing mRNAs, coupling stimulation to local protein synthesis [#31].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established EIF4G2 as a distinct eIF4G-family protein, defining the structural basis for non-canonical function: it shares eIF4G homology but lacks the eIF4E-binding domain, and a dominant-negative fragment implicated it in cell-death regulation.\",\n      \"evidence\": \"Functional cDNA rescue screen and sequence analysis in HeLa cells, transfection-based death assays\",\n      \"pmids\": [\"9032289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct demonstration of translation activity\", \"Mechanism of death protection not resolved\", \"No interaction partners mapped\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the apoptotic processing of EIF4G2 and a self-sustaining circuit: caspase cleavage at position 790 yields p86 that complexes with eIF4A and eIF3, and an IRES in the EIF4G2 5'UTR maintains its own synthesis when cap-dependent translation fails.\",\n      \"evidence\": \"Caspase cleavage mapping, Co-IP, bicistronic reporters, and cell-free translation with recombinant protein\",\n      \"pmids\": [\"10611228\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of physiological IRES target mRNAs not defined\", \"Quantitative contribution of p86 vs p97 unclear\", \"Direct RNA binding not yet shown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated EIF4G2 is essential in vivo and selectively required for differentiation programs rather than bulk translation, distinguishing it functionally from canonical eIF4G.\",\n      \"evidence\": \"Knockout mice (gastrulation lethality) and retinoic-acid differentiation assays in ES cells with expression profiling\",\n      \"pmids\": [\"11032820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific mRNA targets driving differentiation phenotype not identified\", \"Molecular basis of selectivity unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed the caspase-generated p86 fragment, but not the analogous eIF4GI fragment, supports IRES-driven translation of apoptotic regulators, and identified an autoinhibitory C-terminal tail relieved by cleavage.\",\n      \"evidence\": \"IRES reporter assays and truncation-construct expression in cell culture under multiple stresses\",\n      \"pmids\": [\"11943866\", \"12458215\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reporter-based; endogenous target regulation not quantified\", \"Structural basis of autoinhibition not resolved at this stage\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the functional architecture and ribosomal engagement: the N-terminal MIF4G domain mediates ribosome localization, the C-terminus binds eIF2beta, and EIF4G2 supports proliferation through cell-cycle regulators.\",\n      \"evidence\": \"RNAi knockdown, ribosome fractionation, domain mapping, Co-IP of eIF2beta, and CDK2 kinase assays\",\n      \"pmids\": [\"16932749\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reported global translation effect later refined to selective targets\", \"Direct mRNA binding not demonstrated\", \"Recruitment signal unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified Bcl-2 and CDK1 as physiological targets explaining why EIF4G2 loss triggers M-phase apoptosis, linking its selective translation output to cell survival and mitotic progression.\",\n      \"evidence\": \"RNAi, polysome profiling, IRES reporters, CDK1 substrate Westerns, and rescue by ectopic Bcl-2/CDK1\",\n      \"pmids\": [\"18450493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding to Bcl-2/CDK1 5'UTRs not shown here\", \"Full target regulon undefined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided structural rationale for caspase regulation: the C-terminal HEAT-repeat domain resembles eIF4GI/eIF5/eIF2Bepsilon, with a disordered, poorly stabilized loop at the cleavage site explaining protease accessibility and the loss of eIF2beta-interacting acidic residues upon cleavage.\",\n      \"evidence\": \"X-ray crystallography of the C-terminal domain (aa 730–897)\",\n      \"pmids\": [\"18722383\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the full-length protein and MIF4G not yet solved\", \"RNA-binding surface not localized\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Quantified the EIF4G2–eIF4A interaction and gave the first direct demonstration of EIF4G2–mRNA binding, establishing sequence-specific IRES recognition (p53) as part of its mechanism.\",\n      \"evidence\": \"MIF4G crystal structure with ITC and in vitro unwinding assays; EMSA and RNA immunoprecipitation for p53 IRES binding\",\n      \"pmids\": [\"23478064\", \"23318444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of direct binding across targets not established at this point\", \"Structural basis of RNA recognition unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Consolidated the core initiation model—EIF4G2 partners with eIF2beta and eIF4AI to drive cellular IRES translation while being dispensable for cap-dependent translation—and revealed tissue-specific and signaling-gated roles plus species-conserved circadian and developmental functions.\",\n      \"evidence\": \"Co-IP and IRES/in vitro translation assays (human); Drosophila tissue-specific RNAi in spermatogenesis; earlier circadian RNAi in pacemaker neurons\",\n      \"pmids\": [\"25779044\", \"25849588\", \"22904033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide target set not yet defined\", \"Mechanism distinguishing IRES vs scanning roles unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the genome-wide EIF4G2 translatome in human stem cells, linking it to mitochondrial/oxidative-respiration proteins and differentiation factors (HMGN3) and explaining the differentiation and apoptosis phenotypes of EIF4G2 loss.\",\n      \"evidence\": \"Polysome-seq, knockdown in hESCs, embryoid body and mitochondrial respiration assays, IRES reporters\",\n      \"pmids\": [\"27664238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinction between direct and indirect targets incomplete\", \"Initiation mechanism for each target class not parsed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded the mechanism to additional physiological and viral contexts: signaling-gated eIF2beta binding, hypoxia-relevant PHD2 translation, neuronal axon-outgrowth control, viral-protease cleavage redirecting translation, and a PCBP2 regulatory feedback loop.\",\n      \"evidence\": \"Co-IP and knockdown with PHD2/HIF-1alpha readouts; DSCR1.4 5'UTR binding and axon assays; CVB3 2A cleavage mapping and type-I IRES dependence; PCBP2 in vitro translation assays\",\n      \"pmids\": [\"29530922\", \"30718468\", \"26586572\", \"31455634\", \"31010886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most single-lab; mechanistic generality across contexts uncertain\", \"Phospho-sites and signaling inputs incompletely mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established quantitative 5'UTR recognition correlating with translation efficiency and revealed a non-canonical cap-dependent, eIF4E-independent DAP5/eIF3d mechanism governing Treg differentiation.\",\n      \"evidence\": \"Fluorescence anisotropy 5'UTR binding (HIF-1alpha/FGF-9/p53) and in vitro translation; ribosome profiling and knockdown in primary human CD4+ T cells\",\n      \"pmids\": [\"32571876\", \"34848685\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How EIF4G2/eIF3d selects cap-structured mRNAs not fully resolved\", \"Relationship between IRES and cap-dependent modes unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved a distinct scanning/reinitiation mechanism: EIF4G2 promotes leaky scanning and reinitiation downstream of translated uORFs on mRNAs with long structured leaders, replacing eIF4G1 in scanning complexes, with cap/eIF4F-dependent recruitment supporting main-CDS but not uORF translation.\",\n      \"evidence\": \"Ribosome profiling, uORF-containing luciferase reporters with mutational analysis, Co-IP, CLIP in hESCs\",\n      \"pmids\": [\"35018467\", \"36473845\", \"35961752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between IRES and scanning/reinitiation modes not mechanistically defined\", \"Direct binding frequent but not absolutely required—determinants unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Tied EIF4G2-selective translation to disease: a DAP5/eIF3d complex drives EMT and metastasis programs, EIF4G2 supports HCC growth via PLEKHA1 IRES translation and FXTAS RAN translation, and cancer-associated MIF4G mutations dissociate its IRES versus uORF functions.\",\n      \"evidence\": \"Translatome profiling and Co-IP in breast cancer with in vivo metastasis assays; polysome/RIP in HCC; Drosophila FXTAS genetic epistasis; structure-function mutagenesis\",\n      \"pmids\": [\"37314929\", \"39213495\", \"37352983\", \"38129098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional separation of EIF4G2's mechanistic modes incompletely mapped to structure\", \"Some disease links rest on single models\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended EIF4G2's mechanism beyond initiation and into activity-dependent neuronal control: it stimulates eRF3 GTPase activity in translation termination via its MIF4G domain, and depolarization-driven phosphorylation recruits it to dendritic uORF-containing mRNAs for local synthesis.\",\n      \"evidence\": \"Reconstituted termination system with eRF3 GTPase assay (preprint); dendritic APEX proximity labeling, CLIP, ribosome profiling in cortical neurons\",\n      \"pmids\": [\"bio_10.1101_2024.09.10.612082\", \"38589584\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Termination role from a single preprint, not peer-reviewed\", \"Phosphorylation sites and responsible kinase not fully defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined EIF4G2 as a tumor-restraining translational checkpoint and immune-lineage regulator in vivo, and characterized viral hijacking driving senescence: it selectively translates structured-5'UTR tumor suppressors (Pten, Crebbp/Ep300, KAT3 coactivators), sustains Treg and CD8 lineage programs, and SARS-CoV-2 NSP5 cleavage redirects DAP5 to a nuclear p53/CDKN1A-activating fragment countered by TRIM7.\",\n      \"evidence\": \"In vivo CRISPR screens and conditional knockouts (PDAC, intestine, Treg, T-cell) with ribosome profiling and chromatin profiling; cleavage mapping, ChIP-seq, Co-IP and ubiquitination assays for NSP5/TRIM7\",\n      \"pmids\": [\"42202060\", \"38138978\", \"41457459\", \"41940334\", \"42066769\", \"41924271\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis for tumor-context-dependent target selection incomplete\", \"Some translatomic targets validated in single models\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EIF4G2 chooses among its distinct mechanistic modes—IRES recognition, eIF3d-dependent cap-dependent recruitment, leaky-scanning/reinitiation, and termination—on a given target, and what signals or RNA features dictate that choice, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking 5'UTR structural features to a specific initiation mode\", \"Phospho-regulation and cofactor switching incompletely mapped\", \"No full-length structure of EIF4G2 on a target mRNA\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [12, 20, 21, 25, 32]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [1, 5, 13, 23, 24]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 13, 26, 33]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [34, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 15]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 15, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72613\", \"supporting_discovery_ids\": [13, 23, 24]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 5, 13, 24]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [12, 23, 25]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 3, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 16, 36, 38]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 35, 36]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [26, 29, 39]}\n    ],\n    \"complexes\": [\"DAP5/eIF3d complex\"],\n    \"partners\": [\"EIF4A1\", \"EIF2S2\", \"EIF3D\", \"PCBP2\", \"ETF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}