{"gene":"EIF2B3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2000,"finding":"eIF2Bγ (EIF2B3) was identified as a cofactor required for hepatitis C virus IRES-mediated translation. Ribozymes targeting EIF2B3 mRNA inhibited HCV IRES-driven translation of core protein without affecting cap-dependent translation or cell growth, establishing EIF2B3 as specifically involved in HCV IRES function.","method":"Functional genomics ribozyme library screen in HeLa cells with bicistronic HCV IRES reporter; validation with independent ribozymes targeting multiple sites in EIF2B3 mRNA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional genetic knockdown with selective phenotype validated by multiple independent ribozymes, single lab","pmids":["10900014"],"is_preprint":false},{"year":2012,"finding":"siRNA-mediated knockdown of eIF2Bγ (EIF2B3) in Huh7 cells chronically infected with HCV inhibited HCV replication and reduced core protein expression, confirming EIF2B3 as a co-factor supporting HCV chronic infection in a hepatocyte cell model.","method":"siRNA knockdown in Huh7-HCV cells; quantitative PCR and western blotting for HCV RNA and core antigen","journal":"Zhonghua gan zang bing za zhi","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — siRNA knockdown with two orthogonal readouts (qPCR + western blot), single lab, single study","pmids":["23207339"],"is_preprint":false},{"year":2015,"finding":"Oligodendrocytes transfected with mutant EIF2B3 (c.1037T>C) showed decreased cell viability and increased apoptosis under endoplasmic reticulum stress compared to wild-type. Autophagy flux was depressed in mutant cells at baseline and after ER stress, with reduced expression of Atg3 and Atg7. Autophagy inducers rescued cell viability in mutant cells, while autophagy inhibitors aggravated apoptosis, placing EIF2B3 function upstream of autophagy-mediated ER stress tolerance in oligodendrocytes.","method":"Oligodendrocyte cell line transfection with mutant vs. wild-type EIF2B3; cell viability assay, apoptosis measurement, autophagy flux analysis, pharmacological modulation with autophagy inducers/inhibitors","journal":"Brain & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (viability, apoptosis, autophagy flux, pharmacological rescue), single lab","pmids":["26625702"],"is_preprint":false},{"year":2021,"finding":"CRISPR knockout of eif2b3 in zebrafish caused defects in myelin development and glial cell differentiation, increased expression of integrated stress response pathway genes, and ectopic angiogenesis with increased VEGF expression. Ectopic angiogenesis was reduced by VEGF receptor inhibitor SU5416, placing EIF2B3 loss upstream of VEGF-driven angiogenesis. The model was used to validate pathogenicity of 18 known and one novel EIF2B3 human disease variant.","method":"CRISPR mutagenesis in zebrafish (two independent alleles); in silico protein modeling; pharmacological rescue with SU5416; functional complementation of human variants","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent CRISPR alleles with consistent phenotype, pharmacological rescue, and variant validation; single lab","pmids":["33517449"],"is_preprint":false},{"year":2021,"finding":"An intronic polyadenylation (IPA) isoform of EIF2B3 is translated into a C-terminus truncated EIF2Bγ protein. Structural modeling predicts this truncated protein has unfavorable interactions with EIF2γ, potentially destabilizing the nonproductive EIF2:EIF2B complex and shifting the equilibrium between productive and nonproductive states of EIF2:EIF2B. The IPA isoform is expressed in breast cancer cells and normal tissues.","method":"Transcript and protein level analyses confirming IPA mRNA and truncated protein; structural modeling of EIF2Bγ–EIF2γ interactions","journal":"Proteins","confidence":"Low","confidence_rationale":"Tier 3 / Weak — protein isoform confirmed experimentally but mechanistic interaction prediction is computational; single lab, no direct binding assay","pmids":["34796993"],"is_preprint":false}],"current_model":"EIF2B3 (eIF2Bγ), the γ-subunit of the guanine nucleotide exchange factor eIF2B, is required for general translation initiation via the EIF2 cycle and specifically for HCV IRES-mediated translation; loss-of-function mutations impair oligodendrocyte ER stress tolerance through depressed autophagy flux (involving Atg3/Atg7), and in vivo ablation disrupts myelin development, glial differentiation, and activates VEGF-driven ectopic angiogenesis through the integrated stress response pathway."},"narrative":{"mechanistic_narrative":"EIF2B3 (eIF2Bγ) is a subunit of the guanine nucleotide exchange factor eIF2B that supports cap-independent, HCV IRES-mediated translation and, when disrupted, perturbs glial development and cellular stress tolerance [PMID:10900014, PMID:33517449]. In hepatocyte models, EIF2B3 acts as a cofactor required for HCV IRES-driven core protein synthesis and for chronic HCV replication, selectively affecting IRES translation without impairing cap-dependent translation or cell growth [PMID:10900014, PMID:23207339]. Disease-associated EIF2B3 mutation impairs oligodendrocyte survival under ER stress by depressing autophagy flux, with reduced Atg3 and Atg7 expression, and pharmacological autophagy induction rescues mutant cell viability, placing EIF2B3 upstream of autophagy-mediated ER stress tolerance [PMID:26625702]. In vivo, CRISPR ablation of eif2b3 in zebrafish disrupts myelin development and glial differentiation, induces integrated stress response genes, and drives ectopic VEGF-dependent angiogenesis reversible by VEGF receptor inhibition, a model that validated pathogenicity of human EIF2B3 disease variants [PMID:33517449]. Beyond these findings, the biochemical mechanism of EIF2B3 within the eIF2B nucleotide exchange complex has not been directly characterized in the available corpus.","teleology":[{"year":2000,"claim":"Established that EIF2B3 is specifically required for HCV IRES-mediated translation, distinguishing it from general cap-dependent initiation in this context.","evidence":"Ribozyme library screen in HeLa cells with a bicistronic HCV IRES reporter, validated with multiple independent ribozymes","pmids":["10900014"],"confidence":"Medium","gaps":["Does not define the biochemical step at which EIF2B3 acts on IRES translation","No reconstitution or direct binding to the IRES complex"]},{"year":2012,"claim":"Extended the HCV requirement from reporter translation to functional viral replication, confirming EIF2B3 supports chronic infection in hepatocytes.","evidence":"siRNA knockdown in Huh7-HCV cells with qPCR and western blot readouts for HCV RNA and core protein","pmids":["23207339"],"confidence":"Medium","gaps":["Single lab, single study","Mechanism linking EIF2B3 to viral replication versus translation not separated"]},{"year":2015,"claim":"Linked a disease-associated EIF2B3 mutation to oligodendrocyte vulnerability via autophagy, framing EIF2B3 as upstream of autophagy-mediated ER stress tolerance.","evidence":"Transfection of mutant vs wild-type EIF2B3 in an oligodendrocyte cell line with viability, apoptosis, autophagy flux, and pharmacological induction/inhibition","pmids":["26625702"],"confidence":"Medium","gaps":["Mechanism connecting EIF2B3 loss to reduced Atg3/Atg7 unknown","Single mutation tested in a cell line"]},{"year":2021,"claim":"Provided in vivo evidence that EIF2B3 loss disrupts myelination and glial differentiation while activating the integrated stress response and VEGF-driven angiogenesis, and validated human variant pathogenicity.","evidence":"Two independent CRISPR zebrafish alleles, SU5416 pharmacological rescue, and complementation of human disease variants","pmids":["33517449"],"confidence":"Medium","gaps":["Causal chain from ISR activation to VEGF induction not resolved","Cell-type-specific contributions not dissected"]},{"year":2021,"claim":"Identified a C-terminally truncated EIF2B3 isoform from intronic polyadenylation predicted to alter EIF2:EIF2B complex equilibrium, implicating isoform-level regulation of complex stability.","evidence":"Transcript and protein detection of the IPA isoform plus computational structural modeling of EIF2Bγ–EIF2γ interactions","pmids":["34796993"],"confidence":"Low","gaps":["Interaction effect is computational with no direct binding assay","Functional consequence of the isoform on translation not measured"]},{"year":null,"claim":"The direct biochemical role of EIF2B3 within the eIF2B guanine nucleotide exchange complex and its molecular link to ER stress and angiogenesis remain undefined.","evidence":"No reconstitution or structural assay in the available corpus directly assigns EIF2B3 a defined catalytic or binding function","pmids":[],"confidence":"Low","gaps":["No direct enzymatic or binding mechanism established","Connection between translation initiation role and downstream stress/myelin phenotypes unresolved"]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["eIF2B"],"partners":["EIF2S3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NR50","full_name":"Translation initiation factor eIF2B subunit gamma","aliases":["eIF2B GDP-GTP exchange factor subunit gamma"],"length_aa":452,"mass_kda":50.2,"function":"Acts as a component of the translation initiation factor 2B (eIF2B) complex, which catalyzes the exchange of GDP for GTP on the eukaryotic initiation factor 2 (eIF2) complex gamma subunit (PubMed:25858979, PubMed:27023709, PubMed:31048492). Its guanine nucleotide exchange factor activity is repressed when bound to eIF2 complex phosphorylated on the alpha subunit, thereby limiting the amount of methionyl-initiator methionine tRNA available to the ribosome and consequently global translation is repressed (PubMed:25858979, PubMed:31048492)","subcellular_location":"Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q9NR50/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/EIF2B3","classification":"Common Essential","n_dependent_lines":1204,"n_total_lines":1208,"dependency_fraction":0.9966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EIF2S3","stoichiometry":10.0},{"gene":"EIF5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/EIF2B3","total_profiled":1310},"omim":[{"mim_id":"620315","title":"LEUKOENCEPHALOPATHY WITH VANISHING WHITE MATTER 5; VWM5","url":"https://www.omim.org/entry/620315"},{"mim_id":"620314","title":"LEUKOENCEPHALOPATHY WITH VANISHING WHITE MATTER 4; VWM4","url":"https://www.omim.org/entry/620314"},{"mim_id":"620313","title":"LEUKOENCEPHALOPATHY WITH VANISHING WHITE MATTER 3; VWM3","url":"https://www.omim.org/entry/620313"},{"mim_id":"620312","title":"LEUKOENCEPHALOPATHY WITH VANISHING WHITE MATTER 2; VWM2","url":"https://www.omim.org/entry/620312"},{"mim_id":"619701","title":"YOON-BELLEN NEURODEVELOPMENTAL SYNDROME; YOBELN","url":"https://www.omim.org/entry/619701"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EIF2B3"},"hgnc":{"alias_symbol":["EIF2Bgamma","EIF-2B"],"prev_symbol":[]},"alphafold":{"accession":"Q9NR50","domains":[{"cath_id":"3.90.550.10","chopping":"4-147_154-240_294-323","consensus_level":"high","plddt":80.7047,"start":4,"end":323},{"cath_id":"2.160.10.10","chopping":"341-444","consensus_level":"high","plddt":83.6475,"start":341,"end":444}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NR50","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NR50-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NR50-F1-predicted_aligned_error_v6.png","plddt_mean":72.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EIF2B3","jax_strain_url":"https://www.jax.org/strain/search?query=EIF2B3"},"sequence":{"accession":"Q9NR50","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NR50.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NR50/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NR50"}},"corpus_meta":[{"pmid":"10900014","id":"PMC_10900014","title":"Identification of eIF2Bgamma and eIF2gamma as cofactors of hepatitis C virus internal ribosome entry site-mediated translation using a functional genomics approach.","date":"2000","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/10900014","citation_count":75,"is_preprint":false},{"pmid":"22312164","id":"PMC_22312164","title":"Adult-onset vanishing white matter disease due to a novel EIF2B3 mutation.","date":"2012","source":"Archives of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/22312164","citation_count":27,"is_preprint":false},{"pmid":"23115207","id":"PMC_23115207","title":"A 66-year-old patient with vanishing white matter disease due to the p.Ala87Val EIF2B3 mutation.","date":"2012","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/23115207","citation_count":18,"is_preprint":false},{"pmid":"33517449","id":"PMC_33517449","title":"Eif2b3 mutants recapitulate phenotypes of vanishing white matter disease and validate novel disease alleles in zebrafish.","date":"2021","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33517449","citation_count":13,"is_preprint":false},{"pmid":"26625702","id":"PMC_26625702","title":"Endoplasmic reticulum stress intolerance in EIF2B3 mutant oligodendrocytes is modulated by depressed autophagy.","date":"2015","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/26625702","citation_count":12,"is_preprint":false},{"pmid":"33687620","id":"PMC_33687620","title":"Identification of a Missense Variant in the EIF2B3 Gene Causing Vanishing White Matter Disease with Antenatal-Onset but Mild Symptoms and Long-Term Survival.","date":"2021","source":"Journal of molecular neuroscience : MN","url":"https://pubmed.ncbi.nlm.nih.gov/33687620","citation_count":8,"is_preprint":false},{"pmid":"28597716","id":"PMC_28597716","title":"Postmortem Whole Exome Sequencing Identifies Novel EIF2B3 Mutation With Prenatal Phenotype in 2 Siblings.","date":"2017","source":"Journal of child neurology","url":"https://pubmed.ncbi.nlm.nih.gov/28597716","citation_count":7,"is_preprint":false},{"pmid":"28904586","id":"PMC_28904586","title":"Case of Childhood Ataxia with Central Nervous System Hypomyelination with a Novel Mutation in EIF2B3 gene.","date":"2017","source":"Journal of pediatric neurosciences","url":"https://pubmed.ncbi.nlm.nih.gov/28904586","citation_count":6,"is_preprint":false},{"pmid":"34796993","id":"PMC_34796993","title":"A C-term truncated EIF2Bγ protein encoded by an intronically polyadenylated isoform introduces unfavorable EIF2Bγ-EIF2γ interactions.","date":"2021","source":"Proteins","url":"https://pubmed.ncbi.nlm.nih.gov/34796993","citation_count":4,"is_preprint":false},{"pmid":"38872124","id":"PMC_38872124","title":"Adult-onset leukoencephalopathy with vanishing white matter with compound heterozygous EIF2B3 gene variants.","date":"2024","source":"BMC neurology","url":"https://pubmed.ncbi.nlm.nih.gov/38872124","citation_count":4,"is_preprint":false},{"pmid":"31072091","id":"PMC_31072091","title":"Correlation Between Vanishing White Matter Disease and Novel Heterozygous EIF2B3 Variants Using Next-Generation Sequencing: A Case Report.","date":"2019","source":"Annals of rehabilitation medicine","url":"https://pubmed.ncbi.nlm.nih.gov/31072091","citation_count":4,"is_preprint":false},{"pmid":"24028880","id":"PMC_24028880","title":"Childhood Ataxia with Cerebral Hypomyelination Syndrome: a Variant of Patient with Early Childhood Onset Related to EIF2B3 Mutation. A Case Report.","date":"2012","source":"The neuroradiology journal","url":"https://pubmed.ncbi.nlm.nih.gov/24028880","citation_count":2,"is_preprint":false},{"pmid":"23207339","id":"PMC_23207339","title":"[siRNAs targeting La, hVAP-33, eIF2Bgamma, and HCV IRES inhibit the replication and expression of HCV in Huh7 cells].","date":"2012","source":"Zhonghua gan zang bing za zhi = Zhonghua ganzangbing zazhi = Chinese journal of hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/23207339","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8013,"output_tokens":1469,"usd":0.023037,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8227,"output_tokens":1909,"usd":0.04443,"stage2_stop_reason":"end_turn"},"total_usd":0.067467,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"eIF2Bγ (EIF2B3) was identified as a cofactor required for hepatitis C virus IRES-mediated translation. Ribozymes targeting EIF2B3 mRNA inhibited HCV IRES-driven translation of core protein without affecting cap-dependent translation or cell growth, establishing EIF2B3 as specifically involved in HCV IRES function.\",\n      \"method\": \"Functional genomics ribozyme library screen in HeLa cells with bicistronic HCV IRES reporter; validation with independent ribozymes targeting multiple sites in EIF2B3 mRNA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional genetic knockdown with selective phenotype validated by multiple independent ribozymes, single lab\",\n      \"pmids\": [\"10900014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"siRNA-mediated knockdown of eIF2Bγ (EIF2B3) in Huh7 cells chronically infected with HCV inhibited HCV replication and reduced core protein expression, confirming EIF2B3 as a co-factor supporting HCV chronic infection in a hepatocyte cell model.\",\n      \"method\": \"siRNA knockdown in Huh7-HCV cells; quantitative PCR and western blotting for HCV RNA and core antigen\",\n      \"journal\": \"Zhonghua gan zang bing za zhi\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — siRNA knockdown with two orthogonal readouts (qPCR + western blot), single lab, single study\",\n      \"pmids\": [\"23207339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Oligodendrocytes transfected with mutant EIF2B3 (c.1037T>C) showed decreased cell viability and increased apoptosis under endoplasmic reticulum stress compared to wild-type. Autophagy flux was depressed in mutant cells at baseline and after ER stress, with reduced expression of Atg3 and Atg7. Autophagy inducers rescued cell viability in mutant cells, while autophagy inhibitors aggravated apoptosis, placing EIF2B3 function upstream of autophagy-mediated ER stress tolerance in oligodendrocytes.\",\n      \"method\": \"Oligodendrocyte cell line transfection with mutant vs. wild-type EIF2B3; cell viability assay, apoptosis measurement, autophagy flux analysis, pharmacological modulation with autophagy inducers/inhibitors\",\n      \"journal\": \"Brain & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (viability, apoptosis, autophagy flux, pharmacological rescue), single lab\",\n      \"pmids\": [\"26625702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRISPR knockout of eif2b3 in zebrafish caused defects in myelin development and glial cell differentiation, increased expression of integrated stress response pathway genes, and ectopic angiogenesis with increased VEGF expression. Ectopic angiogenesis was reduced by VEGF receptor inhibitor SU5416, placing EIF2B3 loss upstream of VEGF-driven angiogenesis. The model was used to validate pathogenicity of 18 known and one novel EIF2B3 human disease variant.\",\n      \"method\": \"CRISPR mutagenesis in zebrafish (two independent alleles); in silico protein modeling; pharmacological rescue with SU5416; functional complementation of human variants\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent CRISPR alleles with consistent phenotype, pharmacological rescue, and variant validation; single lab\",\n      \"pmids\": [\"33517449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"An intronic polyadenylation (IPA) isoform of EIF2B3 is translated into a C-terminus truncated EIF2Bγ protein. Structural modeling predicts this truncated protein has unfavorable interactions with EIF2γ, potentially destabilizing the nonproductive EIF2:EIF2B complex and shifting the equilibrium between productive and nonproductive states of EIF2:EIF2B. The IPA isoform is expressed in breast cancer cells and normal tissues.\",\n      \"method\": \"Transcript and protein level analyses confirming IPA mRNA and truncated protein; structural modeling of EIF2Bγ–EIF2γ interactions\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — protein isoform confirmed experimentally but mechanistic interaction prediction is computational; single lab, no direct binding assay\",\n      \"pmids\": [\"34796993\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EIF2B3 (eIF2Bγ), the γ-subunit of the guanine nucleotide exchange factor eIF2B, is required for general translation initiation via the EIF2 cycle and specifically for HCV IRES-mediated translation; loss-of-function mutations impair oligodendrocyte ER stress tolerance through depressed autophagy flux (involving Atg3/Atg7), and in vivo ablation disrupts myelin development, glial differentiation, and activates VEGF-driven ectopic angiogenesis through the integrated stress response pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EIF2B3 (eIF2Bγ) is a subunit of the guanine nucleotide exchange factor eIF2B that supports cap-independent, HCV IRES-mediated translation and, when disrupted, perturbs glial development and cellular stress tolerance [#0, #3]. In hepatocyte models, EIF2B3 acts as a cofactor required for HCV IRES-driven core protein synthesis and for chronic HCV replication, selectively affecting IRES translation without impairing cap-dependent translation or cell growth [#0, #1]. Disease-associated EIF2B3 mutation impairs oligodendrocyte survival under ER stress by depressing autophagy flux, with reduced Atg3 and Atg7 expression, and pharmacological autophagy induction rescues mutant cell viability, placing EIF2B3 upstream of autophagy-mediated ER stress tolerance [#2]. In vivo, CRISPR ablation of eif2b3 in zebrafish disrupts myelin development and glial differentiation, induces integrated stress response genes, and drives ectopic VEGF-dependent angiogenesis reversible by VEGF receptor inhibition, a model that validated pathogenicity of human EIF2B3 disease variants [#3]. Beyond these findings, the biochemical mechanism of EIF2B3 within the eIF2B nucleotide exchange complex has not been directly characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that EIF2B3 is specifically required for HCV IRES-mediated translation, distinguishing it from general cap-dependent initiation in this context.\",\n      \"evidence\": \"Ribozyme library screen in HeLa cells with a bicistronic HCV IRES reporter, validated with multiple independent ribozymes\",\n      \"pmids\": [\"10900014\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the biochemical step at which EIF2B3 acts on IRES translation\", \"No reconstitution or direct binding to the IRES complex\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended the HCV requirement from reporter translation to functional viral replication, confirming EIF2B3 supports chronic infection in hepatocytes.\",\n      \"evidence\": \"siRNA knockdown in Huh7-HCV cells with qPCR and western blot readouts for HCV RNA and core protein\",\n      \"pmids\": [\"23207339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, single study\", \"Mechanism linking EIF2B3 to viral replication versus translation not separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked a disease-associated EIF2B3 mutation to oligodendrocyte vulnerability via autophagy, framing EIF2B3 as upstream of autophagy-mediated ER stress tolerance.\",\n      \"evidence\": \"Transfection of mutant vs wild-type EIF2B3 in an oligodendrocyte cell line with viability, apoptosis, autophagy flux, and pharmacological induction/inhibition\",\n      \"pmids\": [\"26625702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting EIF2B3 loss to reduced Atg3/Atg7 unknown\", \"Single mutation tested in a cell line\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided in vivo evidence that EIF2B3 loss disrupts myelination and glial differentiation while activating the integrated stress response and VEGF-driven angiogenesis, and validated human variant pathogenicity.\",\n      \"evidence\": \"Two independent CRISPR zebrafish alleles, SU5416 pharmacological rescue, and complementation of human disease variants\",\n      \"pmids\": [\"33517449\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from ISR activation to VEGF induction not resolved\", \"Cell-type-specific contributions not dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified a C-terminally truncated EIF2B3 isoform from intronic polyadenylation predicted to alter EIF2:EIF2B complex equilibrium, implicating isoform-level regulation of complex stability.\",\n      \"evidence\": \"Transcript and protein detection of the IPA isoform plus computational structural modeling of EIF2Bγ–EIF2γ interactions\",\n      \"pmids\": [\"34796993\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Interaction effect is computational with no direct binding assay\", \"Functional consequence of the isoform on translation not measured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct biochemical role of EIF2B3 within the eIF2B guanine nucleotide exchange complex and its molecular link to ER stress and angiogenesis remain undefined.\",\n      \"evidence\": \"No reconstitution or structural assay in the available corpus directly assigns EIF2B3 a defined catalytic or binding function\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct enzymatic or binding mechanism established\", \"Connection between translation initiation role and downstream stress/myelin phenotypes unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [\"eIF2B\"],\n    \"partners\": [\"EIF2S3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"loss","faith_supported":4,"faith_total":4,"faith_pct":100.0}}