{"gene":"EIF3A","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1996,"finding":"eIF4B directly interacts with the p170 subunit of eIF3 (EIF3A) via a DRYG domain, suggesting eIF4B acts as an intermediary between mRNA and eIF3 during 40S ribosome binding.","method":"Filter overlay (far Western) assay and yeast two-hybrid system","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (far Western + two-hybrid), single lab, direct binding demonstrated","pmids":["8816444"],"is_preprint":false},{"year":1997,"finding":"EIF3A (p170) is an integral subunit of human eIF3 that co-immunoprecipitates with p116, p110, and p36 subunits; p116, p110, and p36 localize on 40S ribosomes in translation-active cells.","method":"Co-immunoprecipitation with affinity-purified anti-p170 antibodies; ribosome localization by cell fractionation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ribosome fractionation, single lab, two orthogonal methods","pmids":["8995409"],"is_preprint":false},{"year":1998,"finding":"EIF3A (p44 subunit interaction): eIF3-p44 interacts strongly and specifically with the eIF3-p170 subunit (EIF3A) by far Western analysis, and p44 also binds 18S rRNA and beta-globin mRNA via an RNA recognition motif.","method":"Far Western (protein-protein overlay) assay; Northwestern blotting","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — far Western and Northwestern blotting, single lab, two orthogonal methods","pmids":["9822659"],"is_preprint":false},{"year":1999,"finding":"TIF32 (yeast EIF3A ortholog, p110 subunit) is an essential eIF3 subunit; its deletion is lethal and its depletion causes runoff of ribosomes from polysomes, indicating an initiation-phase defect. TIF32 directly interacts with p90 (eIF3b ortholog) by far Western and two-hybrid analyses.","method":"Gene deletion/depletion (polysome profiling), co-immunoprecipitation, far Western, two-hybrid","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetics, polysome profiling, co-IP, far Western, two-hybrid), yeast ortholog with conserved function","pmids":["10358023"],"is_preprint":false},{"year":1999,"finding":"The intracellular domain of rat trkA kinase interacts with the p162 subunit of eIF3 (EIF3A) in an activity-dependent manner, identified by yeast two-hybrid screening.","method":"Yeast two-hybrid screen","journal":"Journal of molecular neuroscience : MN","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (two-hybrid), single lab, no functional follow-up on EIF3A","pmids":["10691301"],"is_preprint":false},{"year":2001,"finding":"The RNA recognition motif (RRM) of eIF3 subunit PRT1 (eIF3b) simultaneously interacts with HCR1 and with an internal domain of TIF32 (EIF3A); removal of the PRT1 RRM caused dissociation of TIF32 and destroyed 40S ribosome binding, establishing the PRT1 RRM as crucial for eIF3 integrity and ribosome-binding activity.","method":"Yeast genetic suppressor analysis; co-immunoprecipitation; in vitro binding assays; 40S ribosome binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetics, co-IP, in vitro binding, ribosome binding assay), replicated across subunit deletions","pmids":["11179233"],"is_preprint":false},{"year":2001,"finding":"The foot-and-mouth disease virus (FMDV) IRES interacts with a 116/110 kDa doublet that is a component of eIF3, with domain 5 of the IRES holding the preferential binding site for eIF3.","method":"UV crosslinking; immunoblotting; competition binding assays","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — UV crosslinking and immunoblotting with competition, single lab, two orthogonal methods","pmids":["11565745"],"is_preprint":false},{"year":2001,"finding":"Approximately 20% of EIF3A (p170) is associated with membranes (ER and plasma membranes) via actin filaments, while the remainder is cytoplasmic; membrane-bound p170 is not phosphorylated whereas cytoplasmic p170 is phosphorylated at serine/threonine residues in a serum-stimulated manner.","method":"Subcellular fractionation; immunofluorescence; phosphorylation analysis (serum stimulation)","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation and phosphorylation analysis, single lab, multiple orthogonal methods","pmids":["11484932"],"is_preprint":false},{"year":2002,"finding":"The C-terminal domain (CTD) of TIF32 (EIF3A) directly binds eIF2, providing an independent eIF2–eIF3 contact that is required for eIF2–eIF3 association in vivo; this contact is additive with the NIP1-eIF5-eIF2 connection for translation initiation.","method":"In vivo affinity pulldown with tagged subunit deletion mutants; genetic (overexpression) epistasis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo affinity pulldown with deletion mapping, genetic epistasis, replicated across multiple mutants in single rigorous study","pmids":["12411506"],"is_preprint":false},{"year":2003,"finding":"The N-terminal domain (NTD) of TIF32/eIF3a interacts with small ribosomal protein RPS0A located near the mRNA exit channel; the CTD of TIF32 interacts with helices 16–18 of 18S rRNA; both the N-terminal domain of NIP1 and the CTD of TIF32 interact with eIF1, eIF5, and the eIF2/GTP/Met-tRNAi ternary complex.","method":"In vitro binding assays with purified domains; in vivo affinity pulldown","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro binding and in vivo pulldown with domain-specific deletions, multiple interaction partners mapped, single rigorous study","pmids":["12651896"],"is_preprint":false},{"year":2003,"finding":"EIF3A (p170) mediates the effect of mimosine on mRNA translation; mimosine reduces p170 translation (via iron chelation), which causes decreased synthesis of tyrosinated alpha-tubulin and elevated translation of p27, preceding cell cycle arrest.","method":"Western blot; [35S]-methionine incorporation; iron chelation experiments; cell cycle analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function phenotype linked to specific protein targets, single lab, multiple readouts","pmids":["12972576"],"is_preprint":false},{"year":2004,"finding":"Altering EIF3A (p170) expression level changes the synthesis rate of ribonucleotide reductase M2 (RRM2) and DNA synthesis; decreasing p170 in H1299 and MCF7 cells reversed their malignant growth phenotype, while overall protein synthesis was only ~25% reduced, suggesting p170 regulates translation of a subset of mRNAs.","method":"RNAi knockdown; [35S]-methionine incorporation; [3H]-thymidine incorporation; cell growth assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with specific molecular readout (RRM2 synthesis), single lab, multiple orthogonal methods","pmids":["15094776"],"is_preprint":false},{"year":2006,"finding":"mTOR directly interacts with eIF3 and controls the association of eIF3 and eIF4G in an insulin/mTOR-dependent, rapamycin-sensitive manner; this eIF4G–eIF3 association does not require eIF4E binding to eIF4G nor eIF3 binding to the 40S subunit.","method":"Co-immunoprecipitation; rapamycin/insulin treatment; pharmacological inhibitor assays","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with pharmacological controls, single lab, multiple conditions tested","pmids":["16541103"],"is_preprint":false},{"year":2006,"finding":"Ectopic overexpression of EIF3A in NIH3T3 cells stimulates translation initiation and global protein synthesis, enhances translation of poorly translated mRNAs encoding cyclin D1, c-Myc, FGF-2, and ornithine decarboxylase, and induces oncogenic transformation.","method":"Stable transfection; [35S]-methionine incorporation; polysome profiling; focus formation; soft agar assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with multiple phenotypic readouts and translational profiling, single lab","pmids":["17170115"],"is_preprint":false},{"year":2007,"finding":"EIF3A (p170) expression decreases during intestinal cell differentiation; enforced EIF3A expression inhibits Caco-2 differentiation whereas knockdown promotes differentiation, placing EIF3A as a regulator of intestinal epithelial cell differentiation.","method":"siRNA knockdown; ectopic expression; differentiation assays in colon cell lines; mouse developmental expression analysis","journal":"Differentiation; research in biological diversity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (OE and KD) with defined cellular phenotype, single lab","pmids":["17381544"],"is_preprint":false},{"year":2008,"finding":"The N-terminal domain (NTD) of eIF3a/TIF32 interacts with sequences 5' of uORF1 in GCN4 mRNA; partial deletion of the RPS0A-binding domain of eIF3a impairs eIF3 binding to preinitiation complexes in vivo and severely blocks GCN4 translational induction by reinitiation, revealing that eIF3a is required for post-termination resumption of scanning at uORF1.","method":"Yeast genetics; in vivo ribosome association assays; genetic epistasis with 5' enhancer sequences","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetics with domain-specific deletions, genetic epistasis with cis-acting mRNA elements, multiple orthogonal methods in single rigorous study","pmids":["18765792"],"is_preprint":false},{"year":2009,"finding":"EIF3A expression oscillates during the cell cycle, peaking in S phase; reducing EIF3A expression prolongs the cell cycle without changing cell cycle distribution, and EIF3A affects cellular response to external cell cycle modulators by altering synthesis of their target proteins.","method":"Flow cytometry; Western blot; siRNA knockdown; cell cycle synchronization","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with cell cycle phenotypic readout, single lab, multiple methods","pmids":["19327350"],"is_preprint":false},{"year":2010,"finding":"The C-terminal domain (CTD) of yeast eIF3a/Tif32 contains a conserved KERR motif and box6 element that are required for mRNA recruitment by 43S preinitiation complexes and for scanning fidelity and start codon recognition; the eIF3a CTD also binds ribosomal proteins Rps2 and Rps3, placing it near the mRNA entry channel.","method":"Site-directed mutagenesis; in vivo mRNA recruitment assays; genetic epistasis; in vitro binding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with in vivo functional assays and in vitro binding, multiple orthogonal methods, single rigorous study","pmids":["20584985"],"is_preprint":false},{"year":2011,"finding":"EIF3A knockdown or overexpression, respectively, increases or decreases DNA repair activity and the synthesis of nucleotide excision repair (NER) proteins (XPA, XPC, RAD23B, RPA32), thereby affecting cellular sensitivity to cisplatin.","method":"siRNA knockdown; ectopic overexpression; host-cell reactivation assay (DNA repair); Western blot; MTT assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation with specific molecular (NER protein synthesis) and functional (repair activity) readouts, single lab","pmids":["21625209"],"is_preprint":false},{"year":2011,"finding":"EIF3A knockdown increased NER protein synthesis and repair capacity in lung cancer cells, increasing resistance to cisplatin and anthracyclines; conversely, EIF3A overexpression decreased NER protein levels, thereby sensitizing cells to DNA-damaging drugs.","method":"siRNA knockdown; ectopic overexpression; host-cell reactivation assay; Western blot; MTT assay","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation with mechanistic (NER protein regulation) and cellular (drug sensitivity) readouts, single lab","pmids":["21610145"],"is_preprint":false},{"year":2011,"finding":"Functional reconstitution of human 13-subunit eIF3 in E. coli revealed that the eight structurally conserved subunits form the core that binds the 40S ribosomal subunit, cap-dependent initiation factors, and HCV IRES RNA; the remaining subunits enable assembly of intact initiation complexes with HCV IRES.","method":"Recombinant reconstitution in E. coli; 40S binding assays; HCV IRES binding assays; negative-stain EM","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with functional validation (40S and IRES binding) plus EM structural analysis, single rigorous study with multiple orthogonal methods","pmids":["22135459"],"is_preprint":false},{"year":2011,"finding":"Reinitiation after uORF1 translation in GCN4 mRNA depends on structurally defined reinitiation-promoting elements (RPEs) in the 5' enhancer that operate in an eIF3a/TIF32-dependent manner; two separate regions in the eIF3a/TIF32 NTD stimulate reinitiation in concert with the 5' enhancer.","method":"Yeast genetics; epistasis analysis; biochemical mRNA-protein interaction assays; computational structural modeling","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with domain-specific mutations, biochemical validation, computational modeling, multiple orthogonal methods","pmids":["21750682"],"is_preprint":false},{"year":2012,"finding":"The N-terminal domain (NTD) of eIF3a/TIF32 (residues 200–400) specifically interacts with the C-terminal tail (CTT) of ribosomal protein RPS0A near the mRNA exit channel; depletion of RPS0A reduces eIF3 and associated eIFs on 40S subunits in preinitiation complexes.","method":"In vivo conditional depletion; co-immunoprecipitation; polysome profiling; domain-specific binding assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional depletion with mechanistic readouts, domain mapping, polysome profiling, multiple orthogonal methods","pmids":["22792338"],"is_preprint":false},{"year":2013,"finding":"Mutations in the RNA-binding motif of eIF3a weaken eIF3 binding to the HCV IRES and the 40S ribosomal subunit, suppressing eIF2-dependent recognition of the start codon, revealing a direct connection between the eIF3a RNA-binding motif and start codon recognition.","method":"Site-directed mutagenesis; EM; biochemical binding assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with functional validation (40S binding, start codon recognition), EM structural context, multiple orthogonal methods in single study","pmids":["23766293"],"is_preprint":false},{"year":2013,"finding":"EIF3A suppresses RPA2 synthesis and inhibits cellular IRES activity by directly binding to the IRES element of RPA2 mRNA located at -50 to -150 bases upstream of the translation start site; RPA2 expression is regulated at the translational level via IRES-mediated initiation in response to DNA damage.","method":"RNA immunoprecipitation; IRES reporter assays; siRNA knockdown; Western blot","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA binding (RIP) combined with functional IRES reporter assay and KD, single lab","pmids":["23393223"],"is_preprint":false},{"year":2013,"finding":"EIF3A is recruited to stress granules during iron depletion, hypoxia, and tunicamycin treatment; it positively regulates NDRG1 expression and negatively regulates p27(kip1) expression during iron depletion, and positively regulates proliferation while negatively regulating cell motility and invasion.","method":"Inducible overexpression/ablation; immunofluorescence (stress granule co-localization); Western blot","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible bidirectional manipulation with specific target protein readouts and stress granule localization, single lab","pmids":["23437357"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the eIF3a/TIF32 PCI domain at 2.65-Å resolution shows it is required for integrity of the eIF3 core; the PCI domain's positively charged surface (including residues R363 and K364) is capable of RNA binding, and mutation of these residues severely impairs mRNA recruitment to 43–48S PICs in vivo.","method":"X-ray crystallography; site-directed mutagenesis; in vivo mRNA recruitment assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and in vivo functional validation (mRNA recruitment), multiple orthogonal methods in single study","pmids":["24423867"],"is_preprint":false},{"year":2014,"finding":"X-ray structures of yeast eIF3 core components, combined with EM, cross-linking MS, and integrative modeling, show that eIF3 engages the 40S subunit in a clamp-like manner, encircling it to position initiation factors on opposite ends of the mRNA channel; eIF3a is part of this extended modular arrangement.","method":"X-ray crystallography; cryo-EM; chemical cross-linking coupled to MS; integrative structure modeling","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with multiple orthogonal validation methods (EM, XL-MS, integrative modeling), rigorously replicated","pmids":["25171412"],"is_preprint":false},{"year":2015,"finding":"Cryo-EM structure of eIF3 in the context of the DHX29-bound 43S complex at ~6 Å resolution reveals the PCI/MPN core organization of eIF3, including the positions and interactions of individual subunits (including eIF3a) with components of the 43S complex.","method":"Cryo-electron microscopy; near-complete polyalanine-level model building","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure at near-atomic resolution with model building, replicated across multiple structural studies","pmids":["26344199"],"is_preprint":false},{"year":2015,"finding":"eIF3 (including eIF3a) binds to a specific program of mRNAs involved in cell growth control via their 5' UTR stem-loop structures, exerting either translational activation (c-JUN mRNA) or repression (BTG1 mRNA) through different modes of RNA stem-loop binding.","method":"PAR-CLIP (photoactivatable ribonucleoside-enhanced crosslinking and immunoprecipitation); functional translation reporter assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide PAR-CLIP with functional validation of specific mRNA interactions, multiple orthogonal methods, high-impact single study","pmids":["25849773"],"is_preprint":false},{"year":2015,"finding":"eIF3 dramatically increases the affinity of eIF1 and eIF3j for the 40S subunit; negative cooperativity exists between eIF3j binding and binding of eIF1, eIF1A, and the ternary complex; these interactions collectively stabilize the 43S preinitiation complex.","method":"Fluorescence anisotropy; reconstituted human 43S PIC assembly with defined components","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with quantitative binding measurements (fluorescence anisotropy), systematic component dissection","pmids":["25246524"],"is_preprint":false},{"year":2016,"finding":"eIF3b and EIF3A (eIF3a) serve as the nucleation core for human eIF3 assembly in vivo; in the absence of eIF3b neither the yeast-like core nor the octamer forms, while EIF3A (eIF3a) nucleates the octamer module; disrupting the octamer produces subcomplexes with potential translational regulatory roles.","method":"RNAi knockdown of each subunit in human cells; co-immunoprecipitation; Western blot assessment of subunit levels","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic knockdown of all 12 subunits with comprehensive assembly analysis, multiple orthogonal methods, single rigorous study","pmids":["27924037"],"is_preprint":false},{"year":2017,"finding":"eIF3 (requiring the eIF3a/TIF32 subunit) remains bound to ribosomes elongating short uORFs and is detected on 80S ribosomes at reinitiation-permissive uORFs of GCN4 mRNA in vivo; this association requires intact 5' reinitiation-promoting elements (RPEs) and declines with extended uORF length.","method":"Novel in vivo RNA-protein Ni2+-pulldown assay; genetic analysis of RPE and eIF3a/TIF32 subunit","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — novel direct in vivo RNA-protein pulldown assay with genetic controls, first direct evidence for eIF3 travel with elongating ribosomes","pmids":["28119417"],"is_preprint":false},{"year":2017,"finding":"The molecular basis of reinitiation dependent on eIF3 and sequences flanking uORF1 is conserved between yeast and humans; eIF3 and sequences flanking the human ATF4 uORF1 (functional homolog of GCN4 uORF1) are required for efficient reinitiation in mammalian cells.","method":"Reporter assays in mammalian cells; siRNA knockdown; sequence mutagenesis","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assays with KD and mutagenesis in human cells, single lab","pmids":["28745933"],"is_preprint":false},{"year":2019,"finding":"Human eIF3 acts as a distinct repressor of ferritin light chain (FTL) mRNA translation; eIF3-mediated FTL repression is disrupted by a subset of SNPs in the FTL 5'-UTR that cause hyperferritinemia, establishing a direct causal link between eIF3-mediated translational control and human disease.","method":"PAR-CLIP; translation reporter assays; ribosome profiling; SNP functional analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (PAR-CLIP, ribosome profiling, reporter assays) with disease-linked SNP validation, replicated with multiple methods","pmids":["31414986"],"is_preprint":false},{"year":2019,"finding":"EIF3A regulates HIF1α protein synthesis through IRES-dependent translation; EIF3A depletion significantly reduces HIF1α protein level and cellular glycolysis capacity in hepatocellular carcinoma cells.","method":"siRNA knockdown; IRES reporter assays; Western blot; glycolysis measurement (ECAR)","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with IRES reporter validation and specific molecular target (HIF1α), single lab","pmids":["31218114"],"is_preprint":false},{"year":2020,"finding":"eIF3 deficiency (eIF3e+/- mice) reduces early ribosomal elongation speed between codons 25 and 75 on ~2,700 mRNAs encoding mitochondrial and membrane-associated proteins; eIF3 interacts with 80S ribosomes translating the first ~60 codons and recruits protein quality-control factors, with loss causing defective mitochondria in skeletal muscle and progressive decline in muscle strength.","method":"Ribosome profiling; Co-IP of eIF3 with 80S ribosomes; mouse knockout model; mitochondrial physiology assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling plus 80S Co-IP plus in vivo mouse model with physiological readout, multiple orthogonal methods","pmids":["32589965"],"is_preprint":false},{"year":2020,"finding":"NMR structure of a stem-loop in the c-JUN 5'-UTR shows structural similarity to eIF3-recognizing motifs in HCV-like IRESs; this stem-loop is essential for specialized eIF3-mediated translation initiation of c-JUN.","method":"NMR structure determination; mutational analysis of stem-loop; translation reporter assays","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with mutagenesis and functional validation, multiple orthogonal methods in single study","pmids":["31953146"],"is_preprint":false},{"year":2021,"finding":"Human eIF3 interacts with TCRA and TCRB mRNA 3'-UTRs in a CD28 co-receptor signaling-dependent manner, regulating a burst in TCR translation required for robust T cell activation.","method":"PAR-CLIP; translation reporter assays with TCRA/TCRB 3'-UTRs; CD28 signaling perturbation; ribosome profiling","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — PAR-CLIP combined with functional reporters and signaling perturbation, multiple orthogonal methods","pmids":["34970966"],"is_preprint":false},{"year":2022,"finding":"YTHDF3 recruits EIF3A to facilitate translation of m6A-methylated target mRNAs in oxaliplatin-resistant colorectal cancer cells; eIF2AK2 bridges YTHDF3 and EIF3A, enhancing stability of the YTHDF3/EIF3A complex.","method":"Co-immunoprecipitation; RIP-seq; translation assays; siRNA knockdown","journal":"ACS chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional validation (translation assays) and KD, single lab","pmids":["35708211"],"is_preprint":false},{"year":2023,"finding":"NOP2-mediated m5C modification of c-Myc mRNA induces its degradation in an EIF3A-dependent manner; EIF3A is required for the m5C-dependent destabilization of c-Myc mRNA in hepatocellular carcinoma cells.","method":"m5C methylation assays; siRNA knockdown of EIF3A; mRNA stability assays; RIP","journal":"Research (Washington, D.C.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function (EIF3A KO) with mRNA stability readout, single lab, mechanistic link to m5C modification","pmids":["37398932"],"is_preprint":false},{"year":2000,"finding":"Yeast Rpg1p (TIF32/EIF3A ortholog) co-localizes with microtubules in budded cells and co-immunoprecipitates with alpha-tubulin from yeast cell-free extract; it co-sediments with hog brain microtubules in vitro, identifying EIF3A as a microtubule-interacting protein.","method":"Confocal microscopy; co-immunoprecipitation with anti-tubulin; microtubule co-sedimentation assay","journal":"Cell motility and the cytoskeleton","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-localization, co-IP, and co-sedimentation, single lab, multiple orthogonal methods for localization and binding","pmids":["10706778"],"is_preprint":false}],"current_model":"EIF3A (eIF3 p170/TIF32) is the largest structural and functional subunit of the eIF3 complex that nucleates assembly of the octameric eIF3 module; it directly contacts the 40S ribosomal subunit (via RPS0A and 18S rRNA helices 16–18), recruits eIF2 and eIF1, and promotes mRNA recruitment to the 43S preinitiation complex through RNA-binding surfaces in its PCI and CTD domains; it additionally remains bound to ribosomes during early elongation of short uORFs to enable post-termination reinitiation via interactions with cis-acting 5'-UTR reinitiation-promoting elements, regulates translation of a specific subset of mRNAs (including NER proteins, HIF1α, c-Myc, RPA2, and immune receptor subunits) in response to cellular signals such as iron depletion, DNA damage, mTOR activation, and immune co-stimulation, and participates in eIF3-mediated translational repression of select mRNAs (e.g., FTL) through 5'-UTR stem-loop recognition."},"narrative":{"mechanistic_narrative":"EIF3A (eIF3a/TIF32/p170) is the largest subunit of the eukaryotic translation initiation factor 3 (eIF3) complex and functions as a central scaffold for translation initiation and a selective regulator of mRNA-specific translation [PMID:10358023, PMID:22135459]. As an essential, conserved subunit, EIF3A is required for the integrity and ribosome-binding activity of eIF3; its depletion in yeast causes ribosome runoff from polysomes, and it nucleates assembly of the octameric eIF3 module in human cells together with eIF3b [PMID:10358023, PMID:27924037]. EIF3A makes multiple direct contacts that organize the 43S preinitiation complex: its N-terminal domain binds ribosomal protein RPS0A near the mRNA exit channel, its C-terminal domain contacts 18S rRNA helices 16–18 as well as RPS2/RPS3 near the mRNA entry channel, and both termini engage eIF1, eIF5, and the eIF2/GTP/Met-tRNAi ternary complex to position initiation factors across the 40S subunit [PMID:12651896, PMID:20584985, PMID:22792338, PMID:25171412]. RNA-binding surfaces within its PCI domain and CTD, including residues R363/K364 and a KERR motif, are required for mRNA recruitment to and scanning/start-codon recognition by the 43S complex [PMID:20584985, PMID:24423867, PMID:23766293]. Beyond canonical initiation, EIF3A within eIF3 selectively controls translation of defined mRNA programs through 5'-UTR stem-loop and IRES-like elements, acting as either an activator (c-JUN) or repressor (BTG1, FTL), the latter via a mechanism whose disruption by FTL 5'-UTR SNPs causes hyperferritinemia [PMID:25849773, PMID:31953146, PMID:31414986]. EIF3A also remains associated with ribosomes elongating short upstream ORFs to enable post-termination reinitiation in a manner dependent on its N-terminal domain and cis-acting 5'-UTR reinitiation-promoting elements, a mechanism conserved from yeast GCN4 to human ATF4 [PMID:18765792, PMID:21750682, PMID:28119417, PMID:28745933]. Through these activities EIF3A tunes synthesis of specific targets—including nucleotide excision repair proteins, RPA2, HIF1α, c-Myc, and TCR subunits—in response to iron depletion, DNA damage, mTOR signaling, and immune co-stimulation, linking it to cell-cycle progression, DNA repair, chemosensitivity, and oncogenic transformation [PMID:21625209, PMID:23393223, PMID:31218114, PMID:34970966, PMID:17170115].","teleology":[{"year":1997,"claim":"Establishing EIF3A as a bona fide integral subunit of human eIF3 was the necessary first step, defining it as part of the ribosome-associated initiation machinery rather than a peripheral factor.","evidence":"Co-immunoprecipitation with anti-p170 antibodies and ribosome fractionation in human cells","pmids":["8995409"],"confidence":"Medium","gaps":["Did not map which subunits EIF3A directly contacts","No functional role for EIF3A established"]},{"year":1999,"claim":"Genetic essentiality of the yeast ortholog TIF32 showed EIF3A is required for the initiation phase of translation, not merely a structural passenger.","evidence":"Gene deletion/depletion with polysome profiling, co-IP, far Western, and two-hybrid in yeast","pmids":["10358023"],"confidence":"High","gaps":["Specific ribosomal and factor contacts not yet mapped","Did not address selective mRNA regulation"]},{"year":2003,"claim":"Domain-resolved mapping defined how EIF3A physically organizes the preinitiation complex, contacting both the 40S ribosome (RPS0A, 18S rRNA) and the eIF1/eIF5/ternary complex, explaining its scaffolding role.","evidence":"In vitro binding with purified domains and in vivo affinity pulldown in yeast (building on CTD–eIF2 contact mapping)","pmids":["12651896","12411506"],"confidence":"High","gaps":["Structural detail of these contacts not yet resolved","How contacts are coordinated during scanning unknown"]},{"year":2010,"claim":"Identification of the CTD KERR/box6 elements and RPS2/RPS3 binding placed EIF3A at the mRNA entry channel and assigned it a direct role in mRNA recruitment and start-codon recognition fidelity.","evidence":"Site-directed mutagenesis with in vivo mRNA recruitment and scanning-fidelity assays in yeast","pmids":["20584985"],"confidence":"High","gaps":["Atomic structure of CTD–rRNA/RPS contacts not resolved here","Quantitative contribution to scanning kinetics unclear"]},{"year":2014,"claim":"Crystal and integrative structures defined the PCI/MPN core architecture and showed eIF3 (with EIF3A) clamps the 40S subunit, positioning factors at opposite ends of the mRNA channel and identifying RNA-binding residues required for mRNA recruitment.","evidence":"X-ray crystallography of the EIF3A PCI domain plus EM, cross-linking MS, and integrative modeling, with mutagenesis","pmids":["24423867","25171412"],"confidence":"High","gaps":["Higher-resolution placement of EIF3A flexible domains incomplete","Dynamics during scanning not captured"]},{"year":2015,"claim":"Cryo-EM of the 43S complex and reconstitution of binding cooperativity established how EIF3-containing eIF3 stabilizes the assembled preinitiation complex and recruits eIF1/eIF1A/ternary complex.","evidence":"Cryo-EM of DHX29-bound 43S and fluorescence-anisotropy reconstitution with defined components","pmids":["26344199","25246524"],"confidence":"High","gaps":["Subunit-specific allostery of EIF3A within these transitions unresolved"]},{"year":2016,"claim":"Systematic subunit knockdown showed EIF3A nucleates the octameric eIF3 module in human cells, establishing its hierarchical role in complex assembly.","evidence":"RNAi knockdown of each subunit with co-IP and Western assessment in human cells","pmids":["27924037"],"confidence":"High","gaps":["Whether assembly subcomplexes have distinct regulatory functions not defined here"]},{"year":2008,"claim":"Discovery that the EIF3A NTD binds GCN4 mRNA sequences 5' of uORF1 and is required for resumption of scanning revealed a role beyond canonical initiation: enabling reinitiation after uORF translation.","evidence":"Yeast genetics, in vivo ribosome association, and epistasis with 5' enhancer sequences (extended by RPE characterization in 2011)","pmids":["18765792","21750682"],"confidence":"High","gaps":["Mechanism by which eIF3 stays associated during elongation not yet shown","Conservation in mammals not yet tested at this stage"]},{"year":2015,"claim":"Genome-wide PAR-CLIP demonstrated EIF3-containing eIF3 binds a specific program of 5'-UTR stem-loops to activate or repress defined mRNAs, defining selective translational control as a core EIF3A function.","evidence":"PAR-CLIP with functional translation reporter assays (later refined by NMR of the c-JUN stem-loop)","pmids":["25849773","31953146"],"confidence":"High","gaps":["How activation vs. repression mode is selected at each mRNA not fully resolved","Subunit-specific RNA contact within the complex incompletely defined"]},{"year":2017,"claim":"Direct in vivo detection of eIF3 on 80S ribosomes elongating short uORFs provided physical evidence that EIF3A travels with elongating ribosomes, mechanistically grounding reinitiation, with conservation extending to human ATF4.","evidence":"Novel in vivo RNA-protein Ni2+-pulldown with genetic RPE/TIF32 controls; mammalian reporter assays","pmids":["28119417","28745933"],"confidence":"High","gaps":["Threshold of uORF length tolerated mechanistically undefined","Factors handing off eIF3 at termination not identified"]},{"year":2019,"claim":"Establishing eIF3-mediated FTL repression and its disruption by hyperferritinemia SNPs provided the first direct causal link between EIF3A/eIF3 translational control and human disease.","evidence":"PAR-CLIP, ribosome profiling, reporter assays, and SNP functional analysis","pmids":["31414986"],"confidence":"High","gaps":["Whether EIF3A specifically contacts the FTL element not isolated from the complex","Therapeutic relevance unexplored in this corpus"]},{"year":2020,"claim":"Ribosome profiling and 80S co-IP showed eIF3 regulates early elongation speed and recruits quality-control factors, with knockout causing mitochondrial defects, extending EIF3A function into co-translational control and tissue physiology.","evidence":"Ribosome profiling, 80S Co-IP, and eIF3e+/- mouse model with mitochondrial physiology assays","pmids":["32589965"],"confidence":"High","gaps":["EIF3A-specific contribution within the eIF3e-deficient phenotype not isolated","Identity of recruited QC factors only partly defined"]},{"year":2022,"claim":"Linking EIF3A to m6A/m5C reader machinery (YTHDF3 recruitment, NOP2-dependent c-Myc destabilization) connected EIF3A to RNA-modification-dependent translational and stability control in cancer.","evidence":"Co-IP, RIP-seq/RIP, translation and mRNA stability assays with knockdown (2022 and 2023 studies)","pmids":["35708211","37398932"],"confidence":"Medium","gaps":["Direct vs. indirect nature of EIF3A–m6A/m5C effects not fully resolved","Single-lab observations without reciprocal structural validation"]},{"year":null,"claim":"How EIF3A's selective recognition of distinct 5'-UTR/3'-UTR elements is regulated by signaling inputs (iron, DNA damage, mTOR, CD28) to switch between activation, repression, and reinitiation of specific mRNAs remains incompletely defined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking signal-dependent EIF3A modification to target selection","Subunit-resolved RNA contacts within intact eIF3 for most regulated mRNAs unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2,24,26,29,34,38]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[11,13,15,29,34]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,5,31]},{"term_id":"GO:0060090","term_label":"molecular adaptor 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Behaves as a stimulatory translation initiation factor downstream insulin/growth factors. Is also involved in ribosome biogenesis. Associates with pre-60S subunits in the nucleus and is involved in its nuclear export. Cytoplasmic release of TIF6 from 60S subunits and nuclear relocalization is promoted by a RACK1 (RACK1)-dependent protein kinase C activity (PubMed:10085284, PubMed:14654845, PubMed:21536732). In tissues responsive to insulin, controls fatty acid synthesis and glycolysis by exerting translational control of adipogenic transcription factors such as CEBPB, CEBPD and ATF4 that have G/C rich or uORF in their 5'UTR. Required for ROS-dependent megakaryocyte maturation and platelets formation, controls the expression of mitochondrial respiratory chain genes involved in reactive oxygen species (ROS) synthesis (By similarity). Involved in miRNA-mediated gene silencing by the RNA-induced silencing complex (RISC). Required for both miRNA-mediated translational repression and miRNA-mediated cleavage of complementary mRNAs by RISC (PubMed:17507929). Modulates cell cycle progression and global translation of pre-B cells, its activation seems to be rate-limiting in tumorigenesis and tumor growth (By similarity)","subcellular_location":"Cytoplasm; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P56537/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/EIF3A","classification":"Common 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\"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (far Western + two-hybrid), single lab, direct binding demonstrated\",\n      \"pmids\": [\"8816444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"EIF3A (p170) is an integral subunit of human eIF3 that co-immunoprecipitates with p116, p110, and p36 subunits; p116, p110, and p36 localize on 40S ribosomes in translation-active cells.\",\n      \"method\": \"Co-immunoprecipitation with affinity-purified anti-p170 antibodies; ribosome localization by cell fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ribosome fractionation, single lab, two orthogonal methods\",\n      \"pmids\": [\"8995409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"EIF3A (p44 subunit interaction): eIF3-p44 interacts strongly and specifically with the eIF3-p170 subunit (EIF3A) by far Western analysis, and p44 also binds 18S rRNA and beta-globin mRNA via an RNA recognition motif.\",\n      \"method\": \"Far Western (protein-protein overlay) assay; Northwestern blotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — far Western and Northwestern blotting, single lab, two orthogonal methods\",\n      \"pmids\": [\"9822659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TIF32 (yeast EIF3A ortholog, p110 subunit) is an essential eIF3 subunit; its deletion is lethal and its depletion causes runoff of ribosomes from polysomes, indicating an initiation-phase defect. TIF32 directly interacts with p90 (eIF3b ortholog) by far Western and two-hybrid analyses.\",\n      \"method\": \"Gene deletion/depletion (polysome profiling), co-immunoprecipitation, far Western, two-hybrid\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetics, polysome profiling, co-IP, far Western, two-hybrid), yeast ortholog with conserved function\",\n      \"pmids\": [\"10358023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The intracellular domain of rat trkA kinase interacts with the p162 subunit of eIF3 (EIF3A) in an activity-dependent manner, identified by yeast two-hybrid screening.\",\n      \"method\": \"Yeast two-hybrid screen\",\n      \"journal\": \"Journal of molecular neuroscience : MN\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (two-hybrid), single lab, no functional follow-up on EIF3A\",\n      \"pmids\": [\"10691301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The RNA recognition motif (RRM) of eIF3 subunit PRT1 (eIF3b) simultaneously interacts with HCR1 and with an internal domain of TIF32 (EIF3A); removal of the PRT1 RRM caused dissociation of TIF32 and destroyed 40S ribosome binding, establishing the PRT1 RRM as crucial for eIF3 integrity and ribosome-binding activity.\",\n      \"method\": \"Yeast genetic suppressor analysis; co-immunoprecipitation; in vitro binding assays; 40S ribosome binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetics, co-IP, in vitro binding, ribosome binding assay), replicated across subunit deletions\",\n      \"pmids\": [\"11179233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The foot-and-mouth disease virus (FMDV) IRES interacts with a 116/110 kDa doublet that is a component of eIF3, with domain 5 of the IRES holding the preferential binding site for eIF3.\",\n      \"method\": \"UV crosslinking; immunoblotting; competition binding assays\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — UV crosslinking and immunoblotting with competition, single lab, two orthogonal methods\",\n      \"pmids\": [\"11565745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Approximately 20% of EIF3A (p170) is associated with membranes (ER and plasma membranes) via actin filaments, while the remainder is cytoplasmic; membrane-bound p170 is not phosphorylated whereas cytoplasmic p170 is phosphorylated at serine/threonine residues in a serum-stimulated manner.\",\n      \"method\": \"Subcellular fractionation; immunofluorescence; phosphorylation analysis (serum stimulation)\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation and phosphorylation analysis, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"11484932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The C-terminal domain (CTD) of TIF32 (EIF3A) directly binds eIF2, providing an independent eIF2–eIF3 contact that is required for eIF2–eIF3 association in vivo; this contact is additive with the NIP1-eIF5-eIF2 connection for translation initiation.\",\n      \"method\": \"In vivo affinity pulldown with tagged subunit deletion mutants; genetic (overexpression) epistasis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo affinity pulldown with deletion mapping, genetic epistasis, replicated across multiple mutants in single rigorous study\",\n      \"pmids\": [\"12411506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The N-terminal domain (NTD) of TIF32/eIF3a interacts with small ribosomal protein RPS0A located near the mRNA exit channel; the CTD of TIF32 interacts with helices 16–18 of 18S rRNA; both the N-terminal domain of NIP1 and the CTD of TIF32 interact with eIF1, eIF5, and the eIF2/GTP/Met-tRNAi ternary complex.\",\n      \"method\": \"In vitro binding assays with purified domains; in vivo affinity pulldown\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro binding and in vivo pulldown with domain-specific deletions, multiple interaction partners mapped, single rigorous study\",\n      \"pmids\": [\"12651896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"EIF3A (p170) mediates the effect of mimosine on mRNA translation; mimosine reduces p170 translation (via iron chelation), which causes decreased synthesis of tyrosinated alpha-tubulin and elevated translation of p27, preceding cell cycle arrest.\",\n      \"method\": \"Western blot; [35S]-methionine incorporation; iron chelation experiments; cell cycle analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function phenotype linked to specific protein targets, single lab, multiple readouts\",\n      \"pmids\": [\"12972576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Altering EIF3A (p170) expression level changes the synthesis rate of ribonucleotide reductase M2 (RRM2) and DNA synthesis; decreasing p170 in H1299 and MCF7 cells reversed their malignant growth phenotype, while overall protein synthesis was only ~25% reduced, suggesting p170 regulates translation of a subset of mRNAs.\",\n      \"method\": \"RNAi knockdown; [35S]-methionine incorporation; [3H]-thymidine incorporation; cell growth assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with specific molecular readout (RRM2 synthesis), single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15094776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"mTOR directly interacts with eIF3 and controls the association of eIF3 and eIF4G in an insulin/mTOR-dependent, rapamycin-sensitive manner; this eIF4G–eIF3 association does not require eIF4E binding to eIF4G nor eIF3 binding to the 40S subunit.\",\n      \"method\": \"Co-immunoprecipitation; rapamycin/insulin treatment; pharmacological inhibitor assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with pharmacological controls, single lab, multiple conditions tested\",\n      \"pmids\": [\"16541103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Ectopic overexpression of EIF3A in NIH3T3 cells stimulates translation initiation and global protein synthesis, enhances translation of poorly translated mRNAs encoding cyclin D1, c-Myc, FGF-2, and ornithine decarboxylase, and induces oncogenic transformation.\",\n      \"method\": \"Stable transfection; [35S]-methionine incorporation; polysome profiling; focus formation; soft agar assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with multiple phenotypic readouts and translational profiling, single lab\",\n      \"pmids\": [\"17170115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"EIF3A (p170) expression decreases during intestinal cell differentiation; enforced EIF3A expression inhibits Caco-2 differentiation whereas knockdown promotes differentiation, placing EIF3A as a regulator of intestinal epithelial cell differentiation.\",\n      \"method\": \"siRNA knockdown; ectopic expression; differentiation assays in colon cell lines; mouse developmental expression analysis\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (OE and KD) with defined cellular phenotype, single lab\",\n      \"pmids\": [\"17381544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The N-terminal domain (NTD) of eIF3a/TIF32 interacts with sequences 5' of uORF1 in GCN4 mRNA; partial deletion of the RPS0A-binding domain of eIF3a impairs eIF3 binding to preinitiation complexes in vivo and severely blocks GCN4 translational induction by reinitiation, revealing that eIF3a is required for post-termination resumption of scanning at uORF1.\",\n      \"method\": \"Yeast genetics; in vivo ribosome association assays; genetic epistasis with 5' enhancer sequences\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetics with domain-specific deletions, genetic epistasis with cis-acting mRNA elements, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"18765792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"EIF3A expression oscillates during the cell cycle, peaking in S phase; reducing EIF3A expression prolongs the cell cycle without changing cell cycle distribution, and EIF3A affects cellular response to external cell cycle modulators by altering synthesis of their target proteins.\",\n      \"method\": \"Flow cytometry; Western blot; siRNA knockdown; cell cycle synchronization\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with cell cycle phenotypic readout, single lab, multiple methods\",\n      \"pmids\": [\"19327350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The C-terminal domain (CTD) of yeast eIF3a/Tif32 contains a conserved KERR motif and box6 element that are required for mRNA recruitment by 43S preinitiation complexes and for scanning fidelity and start codon recognition; the eIF3a CTD also binds ribosomal proteins Rps2 and Rps3, placing it near the mRNA entry channel.\",\n      \"method\": \"Site-directed mutagenesis; in vivo mRNA recruitment assays; genetic epistasis; in vitro binding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with in vivo functional assays and in vitro binding, multiple orthogonal methods, single rigorous study\",\n      \"pmids\": [\"20584985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EIF3A knockdown or overexpression, respectively, increases or decreases DNA repair activity and the synthesis of nucleotide excision repair (NER) proteins (XPA, XPC, RAD23B, RPA32), thereby affecting cellular sensitivity to cisplatin.\",\n      \"method\": \"siRNA knockdown; ectopic overexpression; host-cell reactivation assay (DNA repair); Western blot; MTT assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation with specific molecular (NER protein synthesis) and functional (repair activity) readouts, single lab\",\n      \"pmids\": [\"21625209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EIF3A knockdown increased NER protein synthesis and repair capacity in lung cancer cells, increasing resistance to cisplatin and anthracyclines; conversely, EIF3A overexpression decreased NER protein levels, thereby sensitizing cells to DNA-damaging drugs.\",\n      \"method\": \"siRNA knockdown; ectopic overexpression; host-cell reactivation assay; Western blot; MTT assay\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation with mechanistic (NER protein regulation) and cellular (drug sensitivity) readouts, single lab\",\n      \"pmids\": [\"21610145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Functional reconstitution of human 13-subunit eIF3 in E. coli revealed that the eight structurally conserved subunits form the core that binds the 40S ribosomal subunit, cap-dependent initiation factors, and HCV IRES RNA; the remaining subunits enable assembly of intact initiation complexes with HCV IRES.\",\n      \"method\": \"Recombinant reconstitution in E. coli; 40S binding assays; HCV IRES binding assays; negative-stain EM\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with functional validation (40S and IRES binding) plus EM structural analysis, single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"22135459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Reinitiation after uORF1 translation in GCN4 mRNA depends on structurally defined reinitiation-promoting elements (RPEs) in the 5' enhancer that operate in an eIF3a/TIF32-dependent manner; two separate regions in the eIF3a/TIF32 NTD stimulate reinitiation in concert with the 5' enhancer.\",\n      \"method\": \"Yeast genetics; epistasis analysis; biochemical mRNA-protein interaction assays; computational structural modeling\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with domain-specific mutations, biochemical validation, computational modeling, multiple orthogonal methods\",\n      \"pmids\": [\"21750682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The N-terminal domain (NTD) of eIF3a/TIF32 (residues 200–400) specifically interacts with the C-terminal tail (CTT) of ribosomal protein RPS0A near the mRNA exit channel; depletion of RPS0A reduces eIF3 and associated eIFs on 40S subunits in preinitiation complexes.\",\n      \"method\": \"In vivo conditional depletion; co-immunoprecipitation; polysome profiling; domain-specific binding assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional depletion with mechanistic readouts, domain mapping, polysome profiling, multiple orthogonal methods\",\n      \"pmids\": [\"22792338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mutations in the RNA-binding motif of eIF3a weaken eIF3 binding to the HCV IRES and the 40S ribosomal subunit, suppressing eIF2-dependent recognition of the start codon, revealing a direct connection between the eIF3a RNA-binding motif and start codon recognition.\",\n      \"method\": \"Site-directed mutagenesis; EM; biochemical binding assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with functional validation (40S binding, start codon recognition), EM structural context, multiple orthogonal methods in single study\",\n      \"pmids\": [\"23766293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EIF3A suppresses RPA2 synthesis and inhibits cellular IRES activity by directly binding to the IRES element of RPA2 mRNA located at -50 to -150 bases upstream of the translation start site; RPA2 expression is regulated at the translational level via IRES-mediated initiation in response to DNA damage.\",\n      \"method\": \"RNA immunoprecipitation; IRES reporter assays; siRNA knockdown; Western blot\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding (RIP) combined with functional IRES reporter assay and KD, single lab\",\n      \"pmids\": [\"23393223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EIF3A is recruited to stress granules during iron depletion, hypoxia, and tunicamycin treatment; it positively regulates NDRG1 expression and negatively regulates p27(kip1) expression during iron depletion, and positively regulates proliferation while negatively regulating cell motility and invasion.\",\n      \"method\": \"Inducible overexpression/ablation; immunofluorescence (stress granule co-localization); Western blot\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible bidirectional manipulation with specific target protein readouts and stress granule localization, single lab\",\n      \"pmids\": [\"23437357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the eIF3a/TIF32 PCI domain at 2.65-Å resolution shows it is required for integrity of the eIF3 core; the PCI domain's positively charged surface (including residues R363 and K364) is capable of RNA binding, and mutation of these residues severely impairs mRNA recruitment to 43–48S PICs in vivo.\",\n      \"method\": \"X-ray crystallography; site-directed mutagenesis; in vivo mRNA recruitment assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and in vivo functional validation (mRNA recruitment), multiple orthogonal methods in single study\",\n      \"pmids\": [\"24423867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"X-ray structures of yeast eIF3 core components, combined with EM, cross-linking MS, and integrative modeling, show that eIF3 engages the 40S subunit in a clamp-like manner, encircling it to position initiation factors on opposite ends of the mRNA channel; eIF3a is part of this extended modular arrangement.\",\n      \"method\": \"X-ray crystallography; cryo-EM; chemical cross-linking coupled to MS; integrative structure modeling\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with multiple orthogonal validation methods (EM, XL-MS, integrative modeling), rigorously replicated\",\n      \"pmids\": [\"25171412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cryo-EM structure of eIF3 in the context of the DHX29-bound 43S complex at ~6 Å resolution reveals the PCI/MPN core organization of eIF3, including the positions and interactions of individual subunits (including eIF3a) with components of the 43S complex.\",\n      \"method\": \"Cryo-electron microscopy; near-complete polyalanine-level model building\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure at near-atomic resolution with model building, replicated across multiple structural studies\",\n      \"pmids\": [\"26344199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"eIF3 (including eIF3a) binds to a specific program of mRNAs involved in cell growth control via their 5' UTR stem-loop structures, exerting either translational activation (c-JUN mRNA) or repression (BTG1 mRNA) through different modes of RNA stem-loop binding.\",\n      \"method\": \"PAR-CLIP (photoactivatable ribonucleoside-enhanced crosslinking and immunoprecipitation); functional translation reporter assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide PAR-CLIP with functional validation of specific mRNA interactions, multiple orthogonal methods, high-impact single study\",\n      \"pmids\": [\"25849773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"eIF3 dramatically increases the affinity of eIF1 and eIF3j for the 40S subunit; negative cooperativity exists between eIF3j binding and binding of eIF1, eIF1A, and the ternary complex; these interactions collectively stabilize the 43S preinitiation complex.\",\n      \"method\": \"Fluorescence anisotropy; reconstituted human 43S PIC assembly with defined components\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with quantitative binding measurements (fluorescence anisotropy), systematic component dissection\",\n      \"pmids\": [\"25246524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"eIF3b and EIF3A (eIF3a) serve as the nucleation core for human eIF3 assembly in vivo; in the absence of eIF3b neither the yeast-like core nor the octamer forms, while EIF3A (eIF3a) nucleates the octamer module; disrupting the octamer produces subcomplexes with potential translational regulatory roles.\",\n      \"method\": \"RNAi knockdown of each subunit in human cells; co-immunoprecipitation; Western blot assessment of subunit levels\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic knockdown of all 12 subunits with comprehensive assembly analysis, multiple orthogonal methods, single rigorous study\",\n      \"pmids\": [\"27924037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"eIF3 (requiring the eIF3a/TIF32 subunit) remains bound to ribosomes elongating short uORFs and is detected on 80S ribosomes at reinitiation-permissive uORFs of GCN4 mRNA in vivo; this association requires intact 5' reinitiation-promoting elements (RPEs) and declines with extended uORF length.\",\n      \"method\": \"Novel in vivo RNA-protein Ni2+-pulldown assay; genetic analysis of RPE and eIF3a/TIF32 subunit\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — novel direct in vivo RNA-protein pulldown assay with genetic controls, first direct evidence for eIF3 travel with elongating ribosomes\",\n      \"pmids\": [\"28119417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The molecular basis of reinitiation dependent on eIF3 and sequences flanking uORF1 is conserved between yeast and humans; eIF3 and sequences flanking the human ATF4 uORF1 (functional homolog of GCN4 uORF1) are required for efficient reinitiation in mammalian cells.\",\n      \"method\": \"Reporter assays in mammalian cells; siRNA knockdown; sequence mutagenesis\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assays with KD and mutagenesis in human cells, single lab\",\n      \"pmids\": [\"28745933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human eIF3 acts as a distinct repressor of ferritin light chain (FTL) mRNA translation; eIF3-mediated FTL repression is disrupted by a subset of SNPs in the FTL 5'-UTR that cause hyperferritinemia, establishing a direct causal link between eIF3-mediated translational control and human disease.\",\n      \"method\": \"PAR-CLIP; translation reporter assays; ribosome profiling; SNP functional analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (PAR-CLIP, ribosome profiling, reporter assays) with disease-linked SNP validation, replicated with multiple methods\",\n      \"pmids\": [\"31414986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EIF3A regulates HIF1α protein synthesis through IRES-dependent translation; EIF3A depletion significantly reduces HIF1α protein level and cellular glycolysis capacity in hepatocellular carcinoma cells.\",\n      \"method\": \"siRNA knockdown; IRES reporter assays; Western blot; glycolysis measurement (ECAR)\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with IRES reporter validation and specific molecular target (HIF1α), single lab\",\n      \"pmids\": [\"31218114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"eIF3 deficiency (eIF3e+/- mice) reduces early ribosomal elongation speed between codons 25 and 75 on ~2,700 mRNAs encoding mitochondrial and membrane-associated proteins; eIF3 interacts with 80S ribosomes translating the first ~60 codons and recruits protein quality-control factors, with loss causing defective mitochondria in skeletal muscle and progressive decline in muscle strength.\",\n      \"method\": \"Ribosome profiling; Co-IP of eIF3 with 80S ribosomes; mouse knockout model; mitochondrial physiology assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling plus 80S Co-IP plus in vivo mouse model with physiological readout, multiple orthogonal methods\",\n      \"pmids\": [\"32589965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NMR structure of a stem-loop in the c-JUN 5'-UTR shows structural similarity to eIF3-recognizing motifs in HCV-like IRESs; this stem-loop is essential for specialized eIF3-mediated translation initiation of c-JUN.\",\n      \"method\": \"NMR structure determination; mutational analysis of stem-loop; translation reporter assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with mutagenesis and functional validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"31953146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Human eIF3 interacts with TCRA and TCRB mRNA 3'-UTRs in a CD28 co-receptor signaling-dependent manner, regulating a burst in TCR translation required for robust T cell activation.\",\n      \"method\": \"PAR-CLIP; translation reporter assays with TCRA/TCRB 3'-UTRs; CD28 signaling perturbation; ribosome profiling\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — PAR-CLIP combined with functional reporters and signaling perturbation, multiple orthogonal methods\",\n      \"pmids\": [\"34970966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"YTHDF3 recruits EIF3A to facilitate translation of m6A-methylated target mRNAs in oxaliplatin-resistant colorectal cancer cells; eIF2AK2 bridges YTHDF3 and EIF3A, enhancing stability of the YTHDF3/EIF3A complex.\",\n      \"method\": \"Co-immunoprecipitation; RIP-seq; translation assays; siRNA knockdown\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional validation (translation assays) and KD, single lab\",\n      \"pmids\": [\"35708211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NOP2-mediated m5C modification of c-Myc mRNA induces its degradation in an EIF3A-dependent manner; EIF3A is required for the m5C-dependent destabilization of c-Myc mRNA in hepatocellular carcinoma cells.\",\n      \"method\": \"m5C methylation assays; siRNA knockdown of EIF3A; mRNA stability assays; RIP\",\n      \"journal\": \"Research (Washington, D.C.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function (EIF3A KO) with mRNA stability readout, single lab, mechanistic link to m5C modification\",\n      \"pmids\": [\"37398932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Yeast Rpg1p (TIF32/EIF3A ortholog) co-localizes with microtubules in budded cells and co-immunoprecipitates with alpha-tubulin from yeast cell-free extract; it co-sediments with hog brain microtubules in vitro, identifying EIF3A as a microtubule-interacting protein.\",\n      \"method\": \"Confocal microscopy; co-immunoprecipitation with anti-tubulin; microtubule co-sedimentation assay\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-localization, co-IP, and co-sedimentation, single lab, multiple orthogonal methods for localization and binding\",\n      \"pmids\": [\"10706778\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EIF3A (eIF3 p170/TIF32) is the largest structural and functional subunit of the eIF3 complex that nucleates assembly of the octameric eIF3 module; it directly contacts the 40S ribosomal subunit (via RPS0A and 18S rRNA helices 16–18), recruits eIF2 and eIF1, and promotes mRNA recruitment to the 43S preinitiation complex through RNA-binding surfaces in its PCI and CTD domains; it additionally remains bound to ribosomes during early elongation of short uORFs to enable post-termination reinitiation via interactions with cis-acting 5'-UTR reinitiation-promoting elements, regulates translation of a specific subset of mRNAs (including NER proteins, HIF1α, c-Myc, RPA2, and immune receptor subunits) in response to cellular signals such as iron depletion, DNA damage, mTOR activation, and immune co-stimulation, and participates in eIF3-mediated translational repression of select mRNAs (e.g., FTL) through 5'-UTR stem-loop recognition.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EIF3A (eIF3a/TIF32/p170) is the largest subunit of the eukaryotic translation initiation factor 3 (eIF3) complex and functions as a central scaffold for translation initiation and a selective regulator of mRNA-specific translation [#3, #20]. As an essential, conserved subunit, EIF3A is required for the integrity and ribosome-binding activity of eIF3; its depletion in yeast causes ribosome runoff from polysomes, and it nucleates assembly of the octameric eIF3 module in human cells together with eIF3b [#3, #31]. EIF3A makes multiple direct contacts that organize the 43S preinitiation complex: its N-terminal domain binds ribosomal protein RPS0A near the mRNA exit channel, its C-terminal domain contacts 18S rRNA helices 16\\u201318 as well as RPS2/RPS3 near the mRNA entry channel, and both termini engage eIF1, eIF5, and the eIF2/GTP/Met-tRNAi ternary complex to position initiation factors across the 40S subunit [#9, #17, #22, #27]. RNA-binding surfaces within its PCI domain and CTD, including residues R363/K364 and a KERR motif, are required for mRNA recruitment to and scanning/start-codon recognition by the 43S complex [#17, #26, #23]. Beyond canonical initiation, EIF3A within eIF3 selectively controls translation of defined mRNA programs through 5'-UTR stem-loop and IRES-like elements, acting as either an activator (c-JUN) or repressor (BTG1, FTL), the latter via a mechanism whose disruption by FTL 5'-UTR SNPs causes hyperferritinemia [#29, #37, #34]. EIF3A also remains associated with ribosomes elongating short upstream ORFs to enable post-termination reinitiation in a manner dependent on its N-terminal domain and cis-acting 5'-UTR reinitiation-promoting elements, a mechanism conserved from yeast GCN4 to human ATF4 [#15, #21, #32, #33]. Through these activities EIF3A tunes synthesis of specific targets\\u2014including nucleotide excision repair proteins, RPA2, HIF1\\u03b1, c-Myc, and TCR subunits\\u2014in response to iron depletion, DNA damage, mTOR signaling, and immune co-stimulation, linking it to cell-cycle progression, DNA repair, chemosensitivity, and oncogenic transformation [#18, #24, #35, #38, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing EIF3A as a bona fide integral subunit of human eIF3 was the necessary first step, defining it as part of the ribosome-associated initiation machinery rather than a peripheral factor.\",\n      \"evidence\": \"Co-immunoprecipitation with anti-p170 antibodies and ribosome fractionation in human cells\",\n      \"pmids\": [\"8995409\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not map which subunits EIF3A directly contacts\", \"No functional role for EIF3A established\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Genetic essentiality of the yeast ortholog TIF32 showed EIF3A is required for the initiation phase of translation, not merely a structural passenger.\",\n      \"evidence\": \"Gene deletion/depletion with polysome profiling, co-IP, far Western, and two-hybrid in yeast\",\n      \"pmids\": [\"10358023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ribosomal and factor contacts not yet mapped\", \"Did not address selective mRNA regulation\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Domain-resolved mapping defined how EIF3A physically organizes the preinitiation complex, contacting both the 40S ribosome (RPS0A, 18S rRNA) and the eIF1/eIF5/ternary complex, explaining its scaffolding role.\",\n      \"evidence\": \"In vitro binding with purified domains and in vivo affinity pulldown in yeast (building on CTD\\u2013eIF2 contact mapping)\",\n      \"pmids\": [\"12651896\", \"12411506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of these contacts not yet resolved\", \"How contacts are coordinated during scanning unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of the CTD KERR/box6 elements and RPS2/RPS3 binding placed EIF3A at the mRNA entry channel and assigned it a direct role in mRNA recruitment and start-codon recognition fidelity.\",\n      \"evidence\": \"Site-directed mutagenesis with in vivo mRNA recruitment and scanning-fidelity assays in yeast\",\n      \"pmids\": [\"20584985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of CTD\\u2013rRNA/RPS contacts not resolved here\", \"Quantitative contribution to scanning kinetics unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Crystal and integrative structures defined the PCI/MPN core architecture and showed eIF3 (with EIF3A) clamps the 40S subunit, positioning factors at opposite ends of the mRNA channel and identifying RNA-binding residues required for mRNA recruitment.\",\n      \"evidence\": \"X-ray crystallography of the EIF3A PCI domain plus EM, cross-linking MS, and integrative modeling, with mutagenesis\",\n      \"pmids\": [\"24423867\", \"25171412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Higher-resolution placement of EIF3A flexible domains incomplete\", \"Dynamics during scanning not captured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Cryo-EM of the 43S complex and reconstitution of binding cooperativity established how EIF3-containing eIF3 stabilizes the assembled preinitiation complex and recruits eIF1/eIF1A/ternary complex.\",\n      \"evidence\": \"Cryo-EM of DHX29-bound 43S and fluorescence-anisotropy reconstitution with defined components\",\n      \"pmids\": [\"26344199\", \"25246524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subunit-specific allostery of EIF3A within these transitions unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Systematic subunit knockdown showed EIF3A nucleates the octameric eIF3 module in human cells, establishing its hierarchical role in complex assembly.\",\n      \"evidence\": \"RNAi knockdown of each subunit with co-IP and Western assessment in human cells\",\n      \"pmids\": [\"27924037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether assembly subcomplexes have distinct regulatory functions not defined here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that the EIF3A NTD binds GCN4 mRNA sequences 5' of uORF1 and is required for resumption of scanning revealed a role beyond canonical initiation: enabling reinitiation after uORF translation.\",\n      \"evidence\": \"Yeast genetics, in vivo ribosome association, and epistasis with 5' enhancer sequences (extended by RPE characterization in 2011)\",\n      \"pmids\": [\"18765792\", \"21750682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which eIF3 stays associated during elongation not yet shown\", \"Conservation in mammals not yet tested at this stage\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Genome-wide PAR-CLIP demonstrated EIF3-containing eIF3 binds a specific program of 5'-UTR stem-loops to activate or repress defined mRNAs, defining selective translational control as a core EIF3A function.\",\n      \"evidence\": \"PAR-CLIP with functional translation reporter assays (later refined by NMR of the c-JUN stem-loop)\",\n      \"pmids\": [\"25849773\", \"31953146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How activation vs. repression mode is selected at each mRNA not fully resolved\", \"Subunit-specific RNA contact within the complex incompletely defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Direct in vivo detection of eIF3 on 80S ribosomes elongating short uORFs provided physical evidence that EIF3A travels with elongating ribosomes, mechanistically grounding reinitiation, with conservation extending to human ATF4.\",\n      \"evidence\": \"Novel in vivo RNA-protein Ni2+-pulldown with genetic RPE/TIF32 controls; mammalian reporter assays\",\n      \"pmids\": [\"28119417\", \"28745933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold of uORF length tolerated mechanistically undefined\", \"Factors handing off eIF3 at termination not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing eIF3-mediated FTL repression and its disruption by hyperferritinemia SNPs provided the first direct causal link between EIF3A/eIF3 translational control and human disease.\",\n      \"evidence\": \"PAR-CLIP, ribosome profiling, reporter assays, and SNP functional analysis\",\n      \"pmids\": [\"31414986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EIF3A specifically contacts the FTL element not isolated from the complex\", \"Therapeutic relevance unexplored in this corpus\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Ribosome profiling and 80S co-IP showed eIF3 regulates early elongation speed and recruits quality-control factors, with knockout causing mitochondrial defects, extending EIF3A function into co-translational control and tissue physiology.\",\n      \"evidence\": \"Ribosome profiling, 80S Co-IP, and eIF3e+/- mouse model with mitochondrial physiology assays\",\n      \"pmids\": [\"32589965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"EIF3A-specific contribution within the eIF3e-deficient phenotype not isolated\", \"Identity of recruited QC factors only partly defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linking EIF3A to m6A/m5C reader machinery (YTHDF3 recruitment, NOP2-dependent c-Myc destabilization) connected EIF3A to RNA-modification-dependent translational and stability control in cancer.\",\n      \"evidence\": \"Co-IP, RIP-seq/RIP, translation and mRNA stability assays with knockdown (2022 and 2023 studies)\",\n      \"pmids\": [\"35708211\", \"37398932\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect nature of EIF3A\\u2013m6A/m5C effects not fully resolved\", \"Single-lab observations without reciprocal structural validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EIF3A's selective recognition of distinct 5'-UTR/3'-UTR elements is regulated by signaling inputs (iron, DNA damage, mTOR, CD28) to switch between activation, repression, and reinitiation of specific mRNAs remains incompletely defined.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking signal-dependent EIF3A modification to target selection\", \"Subunit-resolved RNA contacts within intact eIF3 for most regulated mRNAs unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 24, 26, 29, 34, 38]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [11, 13, 15, 29, 34]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 5, 31]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [9, 22, 27, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [1, 9, 22, 32, 36]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 25]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [41]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [3, 9, 17, 20]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [29, 34, 38]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 9, 31]}\n    ],\n    \"complexes\": [\"eIF3 complex\", \"43S preinitiation complex\"],\n    \"partners\": [\"EIF3B\", \"EIF4B\", \"EIF2\", \"EIF1\", \"RPS0A\", \"MTOR\", \"YTHDF3\", \"RPS3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}