{"gene":"INS","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1980,"finding":"The human insulin gene (INS) contains two intervening sequences (introns): one within the 5'-untranslated region and one interrupting the C-peptide-encoding region, establishing the pre-mRNA structure and identifying potential regulatory regions upstream of the gene.","method":"DNA sequencing and comparison with rat insulin gene","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — direct sequencing of the human INS gene, foundational and widely replicated","pmids":["6243748"],"is_preprint":false},{"year":1995,"finding":"IDDM2 susceptibility to type 1 diabetes maps to within the insulin gene VNTR minisatellite itself; allelic variation at the VNTR correlates with levels of INS transcription in the pancreas in vivo, implicating transcriptional regulation as the disease mechanism.","method":"Cross-match haplotype analysis, linkage disequilibrium mapping, in vivo INS mRNA quantification by allele","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genetic and molecular methods, replicated across labs","pmids":["7773291"],"is_preprint":false},{"year":1995,"finding":"Insulin inhibits glycogen synthase kinase-3 (GSK3) in vivo through protein kinase B (PKB/Akt), independently of MAPKAP kinase-1 and p70S6K; this places PKB downstream of PI 3-kinase in the insulin signaling cascade leading to GSK3 inhibition and glycogen synthesis.","method":"In vivo kinase assays with PI 3-kinase inhibitors, immunoprecipitation kinase assays, pharmacological blockade of parallel pathways","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — epistasis established by pharmacological blockade plus kinase activity assays, highly cited and replicated","pmids":["8524413"],"is_preprint":false},{"year":1997,"finding":"Insulin (INS) is expressed in human fetal thymus, and class III VNTR alleles at IDDM2 are associated with 2- to 3-fold higher INS mRNA levels in thymus compared to class I alleles, suggesting that thymic INS expression promotes immune tolerance and explains the dominant protective effect of class III alleles against type 1 diabetes.","method":"RT-PCR quantification of INS mRNA in fetal thymus tissues stratified by VNTR genotype","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — direct quantitative measurement of INS expression by genotype in human tissue, replicated across multiple samples","pmids":["9054944"],"is_preprint":false},{"year":1998,"finding":"Insulin-degrading enzyme (IDE) is the principal extracellular protease capable of degrading secreted amyloid beta-protein (Aβ); insulin competitively inhibits IDE-mediated Aβ degradation, and IDE immunodepletion removes Aβ-degrading activity from conditioned medium, establishing insulin as a physiological competitive substrate of IDE.","method":"Purification of IDE from conditioned medium, competitive inhibition assay with insulin, immunodepletion with anti-IDE antibody, CSF identification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical purification, competitive substrate assay, immunodepletion with multiple orthogonal methods","pmids":["9830016"],"is_preprint":false},{"year":1998,"finding":"Insulin is synthesized as preproinsulin with an N-terminal signal sequence and a C-peptide connecting the A and B chains; proinsulin folds in the ER and assembles into zinc-containing hexamers, and these assembly states are exploited during progression through the regulated secretory pathway to mature insulin storage as microcrystals.","method":"Structural, chemical, and genetic analyses; transgenic animal and transfected cell experiments","journal":"Current opinion in structural biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal structural and genetic approaches, foundational mechanistic consensus","pmids":["9631292"],"is_preprint":false},{"year":2000,"finding":"The insulin-linked polymorphic region (ILPR/IDDM2) upstream of the human INS gene forms G-quartet DNA structures in vitro; the ability to form inter- and intramolecular G-quartets correlates with transcriptional activity of the insulin gene, with single nucleotide differences affecting both G-quartet formation and transcriptional output.","method":"G-quartet formation assays, designed high-activity ILPR repeats, transcription reporter assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro structural assay plus reporter transcription assay in single study","pmids":["11070077"],"is_preprint":false},{"year":2001,"finding":"Insulin signaling activates a complex network downstream of the insulin receptor including the PI 3-kinase/Akt pathway controlling glucose uptake and glycogen synthesis, and the Ras/MAPK pathway controlling gene expression; tissues such as muscle, fat, and liver exhibit insulin resistance when these pathways are attenuated.","method":"Biochemical pathway analysis, receptor mutagenesis, downstream kinase assays across multiple cell types","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — comprehensive mechanistic review integrating multiple experimental datasets; pathway architecture is independently replicated","pmids":["11742412"],"is_preprint":false},{"year":2001,"finding":"Acute insulin infusion in obese subjects suppresses intranuclear NFκB and increases IκB in mononuclear cells, reduces reactive oxygen species generation and p47phox (NADPH oxidase subunit), and lowers plasma sICAM-1, MCP-1, and PAI-1, demonstrating a direct anti-inflammatory signaling action of insulin.","method":"Controlled human infusion study with nuclear NFκB quantification, ROS assay, cytokine measurement; dextrose and saline controls","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — controlled human intervention with multiple molecular readouts, single lab","pmids":["11443198"],"is_preprint":false},{"year":2002,"finding":"Insulin/IGF-I hybrid receptors containing the IR-A isoform (Hybrid-Rs-A) bind and are activated by IGF-I, IGF-II, and insulin, leading to activation of the IGF-IR beta-subunit and the IGF-IR-specific substrate CrkII; hybrid receptors containing IR-B are activated with high affinity only by IGF-I, establishing that the IR isoform determines the signaling specificity and biological responses (proliferation, migration) of hybrid receptors.","method":"Cotransfection of IR-A or IR-B with IGF-IR in R(-) cells, ligand binding assays, substrate phosphorylation, proliferation/migration assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution in defined cellular system with multiple readouts and isoform-specific controls","pmids":["12138094"],"is_preprint":false},{"year":2006,"finding":"The INS intronic variant IVS1-6A/T (-23HphI) is a key functional SNP that controls alternative splicing of INS intron 1 through differential recognition of its 3' splice site; the A allele increases production of mature transcripts with a long 5' leader, and these extended mRNAs generate more proinsulin in culture supernatants, establishing -23HphI as a functional IDDM2 variant affecting INS expression via splicing.","method":"Minigene reporter splicing assay in multiple cell lines, proinsulin secretion measurement, expressed sequence tag analysis","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 1 — minigene functional splicing assay with multiple cell lines and protein output measurement","pmids":["16380501"],"is_preprint":false},{"year":2007,"finding":"Ten heterozygous mutations in the human INS gene cause permanent neonatal diabetes; the mutations are in critical regions of preproinsulin and are predicted to prevent normal protein folding, leading to endoplasmic reticulum stress and beta cell death, analogous to the Akita mouse model (Ins2 mutation).","method":"Linkage analysis, candidate gene sequencing, structural modeling of preproinsulin folding; comparison with Akita/Munich mouse models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — human genetic-structural analysis corroborated by established mouse models with identical mutations","pmids":["17855560"],"is_preprint":false},{"year":2009,"finding":"Insulin prevents pathogenic binding of Aβ oligomers (ADDLs) to hippocampal synapses and protects against ADDL-induced loss of surface insulin receptors, oxidative stress, and synaptic spine deterioration; this protection requires insulin receptor tyrosine kinase activity and works through IR signaling-dependent downregulation of ADDL binding sites, not ligand competition.","method":"Hippocampal neuron culture, ADDL binding assay, spine imaging, IR kinase inhibition, CaMKII/CK2 inhibitors","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — multiple pharmacological and imaging approaches in defined neuronal model, single lab","pmids":["19188609"],"is_preprint":false},{"year":2010,"finding":"Insulin signaling in osteoblasts is required for whole-body glucose homeostasis; insulin acts in osteoblasts to increase osteocalcin activity by promoting osteoclastic bone resorption (which occurs at acidic pH sufficient to decarboxylate and thereby activate osteocalcin), establishing a feed-forward endocrine loop in which insulin in osteoblasts activates a bone-derived hormone that in turn promotes glucose metabolism.","method":"Osteoblast-specific insulin receptor knockout mice, osteocalcin carboxylation assays, glucose homeostasis measurements, bone resorption manipulation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with mechanistic rescue, multiple orthogonal assays, validated in mice and humans","pmids":["20655470"],"is_preprint":false},{"year":2021,"finding":"Insulin resistance arises from perturbation of the intracellular signaling cascade downstream of the insulin receptor (IR, IRS proteins, AKT), caused by accumulation of lipid intermediates including ceramide; adipose tissue plays a key initiating role by releasing lipids and circulating factors that promote insulin resistance in muscle, liver, and other organs.","method":"Genetic and biochemical studies integrating human genetics, mouse models, and lipid intermediate measurements","journal":"Nature reviews. Molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — synthesis of multiple experimental datasets across labs; mechanistic pathway supported by independent evidence","pmids":["34285405"],"is_preprint":false}],"current_model":"INS encodes preproinsulin, which folds in the ER (a process disrupted by neonatal diabetes mutations causing ER stress), assembles into zinc hexamers for regulated secretory storage, and is released as mature insulin that signals through its receptor's intrinsic tyrosine kinase activity (requiring phosphorylation of residues 1162/1163) to activate PI3K/PKB/Akt-mediated GSK3 inhibition (promoting glycogen synthesis), suppress NFκB-driven inflammation, and—via osteoblast IR signaling—activate osteocalcin to coordinate whole-body glucose homeostasis; INS expression is itself regulated by the upstream VNTR/IDDM2 region through G-quartet DNA structures and the -23HphI splice-site variant, with higher thymic INS expression from class III alleles promoting immune tolerance."},"narrative":{"teleology":[{"year":1980,"claim":"Determining the genomic organization of human INS—two introns interrupting the coding sequence and upstream regulatory elements—established the physical framework needed to study its transcriptional regulation and processing.","evidence":"DNA sequencing and comparison with rat insulin gene","pmids":["6243748"],"confidence":"High","gaps":["Functional roles of intronic sequences not yet defined","Upstream regulatory elements only identified, not functionally tested"]},{"year":1995,"claim":"Two key mechanistic questions were resolved: (1) the IDDM2 susceptibility locus was mapped directly to the INS VNTR, linking allelic variation to transcriptional output and type 1 diabetes risk, and (2) insulin's metabolic signaling cascade was ordered—PI3K activates PKB/Akt, which inhibits GSK3 independently of MAPK pathways—explaining how insulin drives glycogen synthesis.","evidence":"Cross-match haplotype/LD mapping with in vivo INS mRNA quantification; in vivo kinase assays with PI3-kinase inhibitors and pharmacological blockade of parallel pathways","pmids":["7773291","8524413"],"confidence":"High","gaps":["Mechanism by which VNTR alleles alter transcription not yet identified","Cell-type-specific differences in PI3K/Akt vs. MAPK usage not resolved","Identity of tissues where VNTR-driven INS expression confers disease protection unknown"]},{"year":1997,"claim":"The discovery of INS expression in human fetal thymus—at levels controlled by VNTR class—provided a mechanistic explanation for the dominant protective effect of class III alleles: higher thymic insulin promotes central immune tolerance to insulin.","evidence":"RT-PCR quantification of INS mRNA in fetal thymus stratified by VNTR genotype","pmids":["9054944"],"confidence":"High","gaps":["Direct demonstration of tolerogenic T-cell deletion in response to thymic insulin not shown","Contribution of thymic INS expression relative to peripheral tolerance mechanisms unclear"]},{"year":1998,"claim":"The biosynthetic pathway from preproinsulin to stored mature hormone was consolidated: ER folding, proinsulin assembly into zinc hexamers, and regulated secretory granule maturation explained how beta cells produce and store active insulin.","evidence":"Structural, chemical, and genetic analyses including transgenic animals and transfected cells","pmids":["9631292"],"confidence":"High","gaps":["Specific chaperones governing proinsulin folding in the ER not fully catalogued","Mechanisms controlling hexamer-to-monomer conversion upon secretion not resolved"]},{"year":1998,"claim":"Identification of insulin as a physiological competitive substrate of insulin-degrading enzyme (IDE) revealed a clearance mechanism with implications for amyloid-beta metabolism, since insulin competitively blocks IDE-mediated Aβ degradation.","evidence":"Purification of IDE from conditioned medium, competitive substrate assay, immunodepletion","pmids":["9830016"],"confidence":"High","gaps":["In vivo relevance of insulin–Aβ competition for IDE not established","Relative contribution of IDE versus other insulin-degrading pathways not quantified"]},{"year":2000,"claim":"The mechanistic link between the VNTR and INS transcription was advanced by showing that ILPR repeats form G-quartet DNA structures whose stability correlates with transcriptional activity, providing a structural basis for allele-specific regulation.","evidence":"In vitro G-quartet formation assays combined with transcription reporter assays","pmids":["11070077"],"confidence":"Medium","gaps":["G-quartet formation demonstrated only in vitro; in vivo evidence lacking","Trans-acting factors recognizing G-quartets at the ILPR not identified"]},{"year":2001,"claim":"The downstream signaling network was elaborated: insulin receptor activation branches into PI3K/Akt (glucose uptake, glycogen synthesis) and Ras/MAPK (gene expression) arms, and insulin was shown to exert direct anti-inflammatory effects via NFκB suppression and IκB induction in human mononuclear cells.","evidence":"Biochemical pathway analysis with receptor mutagenesis; controlled human insulin infusion with nuclear NFκB quantification and ROS/cytokine measurements","pmids":["11742412","11443198"],"confidence":"High","gaps":["Molecular mechanism of NFκB suppression by insulin not fully delineated","Tissue-specific versus systemic contribution of anti-inflammatory insulin signaling unclear"]},{"year":2002,"claim":"The functional significance of insulin receptor isoforms was established: IR-A/IGF-IR hybrid receptors respond to insulin, IGF-I, and IGF-II, whereas IR-B hybrids respond primarily to IGF-I, explaining how receptor isoform expression dictates tissue-specific responses to circulating ligands.","evidence":"Cotransfection of IR isoforms with IGF-IR in R(−) cells, ligand binding, substrate phosphorylation, and proliferation/migration assays","pmids":["12138094"],"confidence":"High","gaps":["Relative abundance of hybrid receptor types in normal human tissues not quantified","Downstream signaling specificity of hybrid versus homodimeric receptors not fully mapped"]},{"year":2006,"claim":"A second functional IDDM2 variant was identified: the IVS1-6A/T (−23HphI) SNP controls alternative splicing of INS intron 1, with the A allele producing longer 5′ leader mRNAs that yield more proinsulin, linking splicing regulation to disease-associated variation in insulin output.","evidence":"Minigene splicing reporter in multiple cell lines with proinsulin secretion measurement","pmids":["16380501"],"confidence":"Medium","gaps":["Effect size in primary beta cells not confirmed","Interaction between −23HphI splicing effect and VNTR-mediated transcriptional regulation not dissected"]},{"year":2007,"claim":"Human genetics directly linked INS coding mutations to permanent neonatal diabetes: ten heterozygous preproinsulin mutations disrupt protein folding, cause ER stress, and kill beta cells—mirroring the Akita mouse—establishing misfolded proinsulin as a monogenic diabetes mechanism.","evidence":"Linkage analysis, candidate gene sequencing, structural modeling; corroboration with Akita and Munich mouse models","pmids":["17855560"],"confidence":"High","gaps":["Quantitative relationship between ER stress burden and beta-cell death threshold not determined","Potential for pharmacological chaperone rescue not tested"]},{"year":2010,"claim":"A novel endocrine circuit was uncovered: insulin signaling in osteoblasts promotes osteoclastic bone resorption, which decarboxylates and activates osteocalcin; active osteocalcin then feeds back to enhance whole-body glucose homeostasis, extending insulin's role beyond classical metabolic tissues.","evidence":"Osteoblast-specific insulin receptor knockout mice with osteocalcin carboxylation assays and glucose homeostasis measurements","pmids":["20655470"],"confidence":"High","gaps":["Quantitative contribution of bone-derived osteocalcin to systemic glucose control in humans not established","Whether the insulin–osteocalcin axis is dysregulated in human diabetes not shown"]},{"year":2021,"claim":"The molecular basis of insulin resistance was integrated: lipid intermediates (ceramide, diacylglycerol) accumulate and impair the IR→IRS→Akt cascade, with adipose tissue dysfunction serving as a primary driver that propagates resistance to muscle, liver, and other tissues.","evidence":"Synthesis of human genetics, mouse models, and lipid intermediate measurements","pmids":["34285405"],"confidence":"Medium","gaps":["Relative contributions of individual lipid species to signaling node inhibition not fully resolved","Therapeutic targets within the ceramide pathway not validated in humans"]},{"year":null,"claim":"Key unresolved questions include the precise ER chaperone network governing proinsulin folding, the in vivo role of G-quartet structures at the VNTR, the mechanistic basis of insulin's NFκB suppression, and whether pharmacological chaperones can rescue misfolded-proinsulin neonatal diabetes.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Proinsulin ER folding chaperones incompletely identified","In vivo evidence for G-quartet-mediated transcriptional regulation absent","Molecular mechanism of insulin-driven NFκB suppression unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[2,7,8,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,7,14]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[5,11]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[4,5,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,7,9,12,14]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,7,13]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,8]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,14]}],"complexes":["Zinc-insulin hexamer"],"partners":["INSR","IDE","IGF1R","AKT1","GSK3B","PIK3CA","BGLAP"],"other_free_text":[]},"mechanistic_narrative":"Insulin is a peptide hormone encoded by the INS gene that serves as the master regulator of glucose homeostasis through receptor-mediated signaling in muscle, fat, liver, bone, and brain. Preproinsulin folds in the endoplasmic reticulum, assembles into zinc hexamers for regulated secretory storage, and is processed to mature insulin; missense mutations that disrupt folding cause ER stress and permanent neonatal diabetes [PMID:9631292, PMID:17855560]. Upon secretion, insulin binds its receptor tyrosine kinase to activate the PI3K/PKB(Akt) cascade, which inhibits GSK3 to promote glycogen synthesis, suppresses NFκB-driven inflammation, and—in osteoblasts—stimulates osteocalcin activation to coordinate systemic glucose metabolism [PMID:8524413, PMID:11443198, PMID:20655470]. INS transcription is regulated by the upstream VNTR/IDDM2 locus, where class III alleles drive higher thymic INS expression that promotes immune self-tolerance and protects against type 1 diabetes [PMID:7773291, PMID:9054944]."},"prefetch_data":{"uniprot":{"accession":"P01308","full_name":"Insulin","aliases":[],"length_aa":110,"mass_kda":12.0,"function":"Insulin decreases blood glucose concentration. It increases cell permeability to monosaccharides, amino acids and fatty acids. It accelerates glycolysis, the pentose phosphate cycle, and glycogen synthesis in liver","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P01308/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/INS","classification":"Not Classified","n_dependent_lines":193,"n_total_lines":1208,"dependency_fraction":0.1597682119205298},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/INS","total_profiled":1310},"omim":[{"mim_id":"621494","title":"RNA, U6 SMALL NUCLEAR 9; RNU6-9","url":"https://www.omim.org/entry/621494"},{"mim_id":"621493","title":"RNA, U6 SMALL NUCLEAR 8; RNU6-8","url":"https://www.omim.org/entry/621493"},{"mim_id":"621491","title":"RNA, U6 SMALL NUCLEAR 2; RNU6-2","url":"https://www.omim.org/entry/621491"},{"mim_id":"621355","title":"KRI1 HOMOLOG; KRI1","url":"https://www.omim.org/entry/621355"},{"mim_id":"621173","title":"G PROTEIN-COUPLED RECEPTOR 146; GPR146","url":"https://www.omim.org/entry/621173"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"pancreas","ntpm":12197.1}],"url":"https://www.proteinatlas.org/search/INS"},"hgnc":{"alias_symbol":[],"prev_symbol":["IDDM2","IDDM1"]},"alphafold":{"accession":"P01308","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P01308","model_url":"https://alphafold.ebi.ac.uk/files/AF-P01308-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P01308-F1-predicted_aligned_error_v6.png","plddt_mean":52.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=INS","jax_strain_url":"https://www.jax.org/strain/search?query=INS"},"sequence":{"accession":"P01308","fasta_url":"https://rest.uniprot.org/uniprotkb/P01308.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P01308/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P01308"}},"corpus_meta":[{"pmid":"20064460","id":"PMC_20064460","title":"Eukaryotic stress granules: the ins and outs of translation.","date":"2009","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/20064460","citation_count":1166,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21546914","id":"PMC_21546914","title":"The outs and the ins of sphingosine-1-phosphate in immunity.","date":"2011","source":"Nature reviews. 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metabolism.","date":"2010","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/20655470","citation_count":857,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32296183","id":"PMC_32296183","title":"A reference map of the human binary protein interactome.","date":"2020","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/32296183","citation_count":849,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33961781","id":"PMC_33961781","title":"Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.","date":"2021","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/33961781","citation_count":705,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9830016","id":"PMC_9830016","title":"Insulin-degrading enzyme regulates extracellular levels of amyloid beta-protein by degradation.","date":"1998","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9830016","citation_count":681,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21873635","id":"PMC_21873635","title":"Phylogenetic-based propagation of functional annotations within the Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7773291","id":"PMC_7773291","title":"Susceptibility to human type 1 diabetes at IDDM2 is determined by tandem repeat variation at the insulin gene minisatellite locus.","date":"1995","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/7773291","citation_count":628,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10383393","id":"PMC_10383393","title":"Regulation of Hsp27 oligomerization, chaperone function, and protective activity against oxidative stress/tumor necrosis factor alpha by phosphorylation.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10383393","citation_count":626,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11443198","id":"PMC_11443198","title":"Insulin inhibits intranuclear nuclear factor kappaB and stimulates IkappaB in mononuclear cells in obese subjects: evidence for an anti-inflammatory effect?","date":"2001","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/11443198","citation_count":588,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19020323","id":"PMC_19020323","title":"Genotype score in addition to common risk factors for prediction of type 2 diabetes.","date":"2008","source":"The New England journal of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19020323","citation_count":580,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19073967","id":"PMC_19073967","title":"Shared and distinct genetic variants in type 1 diabetes and celiac disease.","date":"2008","source":"The New England journal of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19073967","citation_count":566,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19188609","id":"PMC_19188609","title":"Protection of synapses against Alzheimer's-linked toxins: insulin signaling prevents the pathogenic binding of Abeta oligomers.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19188609","citation_count":538,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34285405","id":"PMC_34285405","title":"The aetiology and molecular landscape of insulin resistance.","date":"2021","source":"Nature reviews. Molecular cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/34285405","citation_count":464,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"6243748","id":"PMC_6243748","title":"Sequence of the human insulin gene.","date":"1980","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/6243748","citation_count":457,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15489334","id":"PMC_15489334","title":"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).","date":"2004","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/15489334","citation_count":438,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8702995","id":"PMC_8702995","title":"Akt, a pleckstrin homology domain containing kinase, is activated primarily by phosphorylation.","date":"1996","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8702995","citation_count":423,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17632545","id":"PMC_17632545","title":"A genome-wide association study identifies KIAA0350 as a type 1 diabetes gene.","date":"2007","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/17632545","citation_count":422,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17855560","id":"PMC_17855560","title":"Insulin gene mutations as a cause of permanent neonatal diabetes.","date":"2007","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/17855560","citation_count":416,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9631292","id":"PMC_9631292","title":"The role of assembly in insulin's biosynthesis.","date":"1998","source":"Current opinion in structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/9631292","citation_count":406,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12138094","id":"PMC_12138094","title":"Insulin/insulin-like growth factor I hybrid receptors have different biological characteristics depending on the insulin receptor isoform involved.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12138094","citation_count":393,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":33924,"output_tokens":1607,"usd":0.062938},"stage2":{"model":"claude-opus-4-6","input_tokens":4840,"output_tokens":1854,"usd":0.105825},"total_usd":0.438053,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":46557,"output_tokens":4174,"usd":0.10114},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7070,"output_tokens":3070,"usd":0.16815}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"INS VNTR class III alleles at the IDDM2 locus are associated with 2- to 3-fold higher INS mRNA levels in human fetal thymus compared to class I alleles, suggesting that higher thymic insulin expression facilitates immune tolerance induction and underlies the dominant protective effect of class III alleles against type 1 diabetes.\",\n      \"method\": \"RT-PCR quantification of INS mRNA in human fetal thymus tissue stratified by VNTR allele class\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct mRNA quantification in human tissue with functional mechanistic interpretation; single lab, single method\",\n      \"pmids\": [\"9054944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The insulin-linked polymorphic region (ILPR/IDDM2) upstream of the INS gene can form G-quartet DNA structures in vitro, and both inter- and intramolecular G-quartet formation influence transcriptional activity of the human insulin gene; single nucleotide differences in the ILPR known to affect insulin transcription correlate with the ability to form these unusual structures.\",\n      \"method\": \"In vitro G-quartet formation assays, transcriptional reporter assays with engineered ILPR repeats\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro structural assay combined with transcriptional reporter assay; single lab\",\n      \"pmids\": [\"11070077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Fine mapping of IDDM2 identified two candidate causal variants (-23HphI and +1140A/C) in addition to the VNTR within a ~2-kb region of the INS locus on chromosome 11p15, indicating that disease susceptibility maps to one or more of these common variants rather than exclusively to the VNTR.\",\n      \"method\": \"Systematic genotyping of 177 polymorphisms in up to 2,960 pedigrees with robust regression association analysis\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale genetic fine mapping with multiple polymorphisms; single study but large sample\",\n      \"pmids\": [\"15220214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The INS intron 1 variant IVS1-6A/T (-23HphI) influences alternative splicing of INS pre-mRNA through differential recognition of the intron 1 3' splice site; the A allele increases production of mature transcripts with a long 5' leader, and these extended mRNAs generate more proinsulin in culture supernatants than natural transcripts.\",\n      \"method\": \"Minigene reporter splicing assays in multiple cell lines, sequencing of beta-cell expressed sequence tags, proinsulin secretion measurement\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — minigene reporter assay with multiple cell lines plus functional proinsulin secretion readout; multiple orthogonal methods in single study\",\n      \"pmids\": [\"16380501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In INS-1 beta-cell insulinoma cells, VGF protein is processed in a post-endoplasmic reticulum compartment to produce low-molecular-mass peptides that are released via a regulated secretory pathway; release is stimulated 3- to 6-fold by glucose (15 mM), dibutyryl-cAMP, or phorbol ester, but VGF mRNA is upregulated by elevated intracellular cAMP and not by glucose or phorbol ester.\",\n      \"method\": \"Western blot, immunoprecipitation, VGF peptide release assays with secretagogue stimulation in INS-1 cells\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional secretion and processing assays in INS-1 cells with multiple stimuli; single lab\",\n      \"pmids\": [\"10433233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In INS-1 beta-cells, alpha3beta1 integrin is the most highly expressed alphabeta1 integrin heterodimer; its interaction with collagen I and IV matrices promotes cell adhesion, spreading, viability, proliferation, FAK phosphorylation, Pdx-1 and insulin gene/protein expression, and enhanced glucose-stimulated insulin secretion; functional blockade of alpha3beta1 reduces these effects.\",\n      \"method\": \"Flow cytometry for integrin expression, adhesion/spreading assays, MTT viability assay, FAK phosphorylation by Western blot, RT-PCR and ELISA for insulin/Pdx-1, glucose-stimulated insulin secretion assay with blocking antibody\",\n      \"journal\": \"Journal of cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays in INS-1 cells with loss-of-function (blocking antibody); single lab\",\n      \"pmids\": [\"19023675\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"The human INS gene's expression is regulated at multiple levels: the upstream VNTR/IDDM2 locus modulates transcription in a tissue-specific manner (higher in thymus with class III alleles, facilitating immune tolerance), the intron 1 -23HphI variant controls alternative splicing efficiency and thereby proinsulin output, and G-quartet structures formed by the ILPR can directly influence transcriptional activity; in pancreatic beta-cells (modeled by INS-1 cells), insulin synthesis and secretion are further regulated by integrin-ECM interactions (particularly alpha3beta1-collagen) acting through FAK signaling to control Pdx-1 and insulin gene expression, and by a regulated secretory pathway responsive to glucose, cAMP, and PKC stimulation.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification:**\n\nMost papers in the retrieved corpus (papers 1-100) are about \"ins and outs\" review articles on completely unrelated topics (stress granules, S1P, Raf kinases, DNA damage, etc.) — these are EXCLUDE (alias collision with the phrase \"ins and outs\").\n\nPapers relevant to INS (insulin gene/protein):\n- Paper [3]: INS VNTR/thymic expression → KEEP\n- Paper [33]: IDDM2 remapping → EXCLUDE (genetic mapping, no mechanism)\n- Paper [52]: G-quartet DNA structure at ILPR affects INS transcription → KEEP\n- Paper [84]: INS pre-mRNA splicing → KEEP\n- Paper [87]: VGF in INS-1 cells → EXCLUDE (about VGF, not INS)\n- Paper [91]: integrins in INS-1 cells → EXCLUDE (about integrins, INS-1 is just the cell line)\n\nFrom gene2pubmed papers:\n- [1] GSK3 inhibition by insulin via PKB → KEEP\n- [2] Insulin signaling/glucose metabolism → KEEP (review but mechanistic)\n- [3] YTHDF3/m6A → EXCLUDE (not about INS)\n- [4] MGC cDNA → EXCLUDE\n- [5] T1D GWAS → EXCLUDE\n- [6] Sulfonylurea receptor/KATP → EXCLUDE (about SUR1, not INS)\n- [7] T1D GWAS → EXCLUDE\n- [8] T1D genome search → EXCLUDE\n- [9] Insulin receptor tyrosine residues 1162/1163 → KEEP (insulin receptor mechanism)\n- [10] Lipid-induced insulin resistance/DAG/PKC → KEEP\n- [11] Proteome interactome → EXCLUDE\n- [12] Insulin signaling in osteoblasts → KEEP\n- [13] HuRI interactome → EXCLUDE\n- [14] BioPlex → EXCLUDE\n- [15] IDE degrades Abeta → KEEP (insulin as competitive substrate of IDE)\n- [16] GO annotations → EXCLUDE\n- [17] IDDM2 VNTR susceptibility → KEEP\n- [18] Hsp27 → EXCLUDE\n- [19] Insulin inhibits NFκB → KEEP\n- [20] Genotype score T2D → EXCLUDE\n- [21] T1D/celiac shared variants → EXCLUDE\n- [22] Insulin protects synapses from Aβ oligomers → KEEP\n- [23] Insulin resistance aetiology → KEEP\n- [24] Sequence of human insulin gene → KEEP\n- [25] MGC → EXCLUDE\n- [26] Akt activation by phosphorylation → KEEP\n- [27] KIAA0350/T1D → EXCLUDE\n- [28] Insulin gene mutations/neonatal diabetes → KEEP\n- [29] Role of assembly in insulin biosynthesis → KEEP\n- [30] Insulin/IGF-I hybrid receptors → KEEP\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1980,\n      \"finding\": \"The human insulin gene (INS) contains two intervening sequences (introns): one within the 5'-untranslated region and one interrupting the C-peptide-encoding region, establishing the pre-mRNA structure and identifying potential regulatory regions upstream of the gene.\",\n      \"method\": \"DNA sequencing and comparison with rat insulin gene\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct sequencing of the human INS gene, foundational and widely replicated\",\n      \"pmids\": [\"6243748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"IDDM2 susceptibility to type 1 diabetes maps to within the insulin gene VNTR minisatellite itself; allelic variation at the VNTR correlates with levels of INS transcription in the pancreas in vivo, implicating transcriptional regulation as the disease mechanism.\",\n      \"method\": \"Cross-match haplotype analysis, linkage disequilibrium mapping, in vivo INS mRNA quantification by allele\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic and molecular methods, replicated across labs\",\n      \"pmids\": [\"7773291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Insulin inhibits glycogen synthase kinase-3 (GSK3) in vivo through protein kinase B (PKB/Akt), independently of MAPKAP kinase-1 and p70S6K; this places PKB downstream of PI 3-kinase in the insulin signaling cascade leading to GSK3 inhibition and glycogen synthesis.\",\n      \"method\": \"In vivo kinase assays with PI 3-kinase inhibitors, immunoprecipitation kinase assays, pharmacological blockade of parallel pathways\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established by pharmacological blockade plus kinase activity assays, highly cited and replicated\",\n      \"pmids\": [\"8524413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Insulin (INS) is expressed in human fetal thymus, and class III VNTR alleles at IDDM2 are associated with 2- to 3-fold higher INS mRNA levels in thymus compared to class I alleles, suggesting that thymic INS expression promotes immune tolerance and explains the dominant protective effect of class III alleles against type 1 diabetes.\",\n      \"method\": \"RT-PCR quantification of INS mRNA in fetal thymus tissues stratified by VNTR genotype\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct quantitative measurement of INS expression by genotype in human tissue, replicated across multiple samples\",\n      \"pmids\": [\"9054944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Insulin-degrading enzyme (IDE) is the principal extracellular protease capable of degrading secreted amyloid beta-protein (Aβ); insulin competitively inhibits IDE-mediated Aβ degradation, and IDE immunodepletion removes Aβ-degrading activity from conditioned medium, establishing insulin as a physiological competitive substrate of IDE.\",\n      \"method\": \"Purification of IDE from conditioned medium, competitive inhibition assay with insulin, immunodepletion with anti-IDE antibody, CSF identification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical purification, competitive substrate assay, immunodepletion with multiple orthogonal methods\",\n      \"pmids\": [\"9830016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Insulin is synthesized as preproinsulin with an N-terminal signal sequence and a C-peptide connecting the A and B chains; proinsulin folds in the ER and assembles into zinc-containing hexamers, and these assembly states are exploited during progression through the regulated secretory pathway to mature insulin storage as microcrystals.\",\n      \"method\": \"Structural, chemical, and genetic analyses; transgenic animal and transfected cell experiments\",\n      \"journal\": \"Current opinion in structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal structural and genetic approaches, foundational mechanistic consensus\",\n      \"pmids\": [\"9631292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The insulin-linked polymorphic region (ILPR/IDDM2) upstream of the human INS gene forms G-quartet DNA structures in vitro; the ability to form inter- and intramolecular G-quartets correlates with transcriptional activity of the insulin gene, with single nucleotide differences affecting both G-quartet formation and transcriptional output.\",\n      \"method\": \"G-quartet formation assays, designed high-activity ILPR repeats, transcription reporter assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro structural assay plus reporter transcription assay in single study\",\n      \"pmids\": [\"11070077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Insulin signaling activates a complex network downstream of the insulin receptor including the PI 3-kinase/Akt pathway controlling glucose uptake and glycogen synthesis, and the Ras/MAPK pathway controlling gene expression; tissues such as muscle, fat, and liver exhibit insulin resistance when these pathways are attenuated.\",\n      \"method\": \"Biochemical pathway analysis, receptor mutagenesis, downstream kinase assays across multiple cell types\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive mechanistic review integrating multiple experimental datasets; pathway architecture is independently replicated\",\n      \"pmids\": [\"11742412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Acute insulin infusion in obese subjects suppresses intranuclear NFκB and increases IκB in mononuclear cells, reduces reactive oxygen species generation and p47phox (NADPH oxidase subunit), and lowers plasma sICAM-1, MCP-1, and PAI-1, demonstrating a direct anti-inflammatory signaling action of insulin.\",\n      \"method\": \"Controlled human infusion study with nuclear NFκB quantification, ROS assay, cytokine measurement; dextrose and saline controls\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — controlled human intervention with multiple molecular readouts, single lab\",\n      \"pmids\": [\"11443198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Insulin/IGF-I hybrid receptors containing the IR-A isoform (Hybrid-Rs-A) bind and are activated by IGF-I, IGF-II, and insulin, leading to activation of the IGF-IR beta-subunit and the IGF-IR-specific substrate CrkII; hybrid receptors containing IR-B are activated with high affinity only by IGF-I, establishing that the IR isoform determines the signaling specificity and biological responses (proliferation, migration) of hybrid receptors.\",\n      \"method\": \"Cotransfection of IR-A or IR-B with IGF-IR in R(-) cells, ligand binding assays, substrate phosphorylation, proliferation/migration assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution in defined cellular system with multiple readouts and isoform-specific controls\",\n      \"pmids\": [\"12138094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The INS intronic variant IVS1-6A/T (-23HphI) is a key functional SNP that controls alternative splicing of INS intron 1 through differential recognition of its 3' splice site; the A allele increases production of mature transcripts with a long 5' leader, and these extended mRNAs generate more proinsulin in culture supernatants, establishing -23HphI as a functional IDDM2 variant affecting INS expression via splicing.\",\n      \"method\": \"Minigene reporter splicing assay in multiple cell lines, proinsulin secretion measurement, expressed sequence tag analysis\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — minigene functional splicing assay with multiple cell lines and protein output measurement\",\n      \"pmids\": [\"16380501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ten heterozygous mutations in the human INS gene cause permanent neonatal diabetes; the mutations are in critical regions of preproinsulin and are predicted to prevent normal protein folding, leading to endoplasmic reticulum stress and beta cell death, analogous to the Akita mouse model (Ins2 mutation).\",\n      \"method\": \"Linkage analysis, candidate gene sequencing, structural modeling of preproinsulin folding; comparison with Akita/Munich mouse models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetic-structural analysis corroborated by established mouse models with identical mutations\",\n      \"pmids\": [\"17855560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Insulin prevents pathogenic binding of Aβ oligomers (ADDLs) to hippocampal synapses and protects against ADDL-induced loss of surface insulin receptors, oxidative stress, and synaptic spine deterioration; this protection requires insulin receptor tyrosine kinase activity and works through IR signaling-dependent downregulation of ADDL binding sites, not ligand competition.\",\n      \"method\": \"Hippocampal neuron culture, ADDL binding assay, spine imaging, IR kinase inhibition, CaMKII/CK2 inhibitors\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological and imaging approaches in defined neuronal model, single lab\",\n      \"pmids\": [\"19188609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Insulin signaling in osteoblasts is required for whole-body glucose homeostasis; insulin acts in osteoblasts to increase osteocalcin activity by promoting osteoclastic bone resorption (which occurs at acidic pH sufficient to decarboxylate and thereby activate osteocalcin), establishing a feed-forward endocrine loop in which insulin in osteoblasts activates a bone-derived hormone that in turn promotes glucose metabolism.\",\n      \"method\": \"Osteoblast-specific insulin receptor knockout mice, osteocalcin carboxylation assays, glucose homeostasis measurements, bone resorption manipulation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic rescue, multiple orthogonal assays, validated in mice and humans\",\n      \"pmids\": [\"20655470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Insulin resistance arises from perturbation of the intracellular signaling cascade downstream of the insulin receptor (IR, IRS proteins, AKT), caused by accumulation of lipid intermediates including ceramide; adipose tissue plays a key initiating role by releasing lipids and circulating factors that promote insulin resistance in muscle, liver, and other organs.\",\n      \"method\": \"Genetic and biochemical studies integrating human genetics, mouse models, and lipid intermediate measurements\",\n      \"journal\": \"Nature reviews. Molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple experimental datasets across labs; mechanistic pathway supported by independent evidence\",\n      \"pmids\": [\"34285405\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"INS encodes preproinsulin, which folds in the ER (a process disrupted by neonatal diabetes mutations causing ER stress), assembles into zinc hexamers for regulated secretory storage, and is released as mature insulin that signals through its receptor's intrinsic tyrosine kinase activity (requiring phosphorylation of residues 1162/1163) to activate PI3K/PKB/Akt-mediated GSK3 inhibition (promoting glycogen synthesis), suppress NFκB-driven inflammation, and—via osteoblast IR signaling—activate osteocalcin to coordinate whole-body glucose homeostasis; INS expression is itself regulated by the upstream VNTR/IDDM2 region through G-quartet DNA structures and the -23HphI splice-site variant, with higher thymic INS expression from class III alleles promoting immune tolerance.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"INS encodes preproinsulin, the precursor of insulin, whose transcription is regulated by cis-acting elements including the upstream VNTR (IDDM2 locus) and the insulin-linked polymorphic region (ILPR), which forms G-quartet DNA structures that modulate transcriptional activity [PMID:11070077]. VNTR class III alleles drive 2–3-fold higher INS mRNA in thymus, promoting immune tolerance and conferring protection against type 1 diabetes, while the intron 1 -23HphI (IVS1-6A/T) variant controls alternative splicing efficiency at the intron 1 3′ splice site, altering the ratio of mRNA isoforms and thereby modulating proinsulin output [PMID:9054944, PMID:16380501]. In pancreatic beta cells, insulin gene expression and glucose-stimulated insulin secretion are further regulated by alpha3beta1 integrin–collagen interactions acting through FAK signaling to control Pdx-1 and insulin transcription [PMID:19023675].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that VNTR allelic variation at the IDDM2 locus quantitatively controls INS transcription in thymus resolved how a non-coding polymorphism upstream of INS could confer dominant protection against type 1 diabetes — through enhanced thymic insulin expression and presumed negative selection of autoreactive T cells.\",\n      \"evidence\": \"RT-PCR quantification of INS mRNA in human fetal thymus stratified by VNTR genotype\",\n      \"pmids\": [\"9054944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-method (RT-PCR) measurement in one tissue cohort without independent replication\",\n        \"Direct demonstration that higher thymic insulin drives T-cell tolerance deletion was not shown\",\n        \"Mechanism by which VNTR repeat length controls transcription rate was not defined\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating regulated secretory-pathway processing and stimulus-dependent release of VGF-derived peptides in INS-1 cells established this line as a model for studying beta-cell regulated secretion responsive to glucose, cAMP, and PKC activation.\",\n      \"evidence\": \"Western blot, immunoprecipitation, and VGF peptide release assays with secretagogue stimulation in INS-1 cells\",\n      \"pmids\": [\"10433233\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"This study characterized VGF processing in INS-1 cells rather than insulin itself\",\n        \"Relevance to primary human beta-cell secretory mechanisms not confirmed\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showing that the ILPR upstream of INS forms G-quartet DNA structures whose stability correlates with known transcription-affecting polymorphisms provided a structural mechanism linking VNTR/ILPR sequence variation to INS transcriptional output.\",\n      \"evidence\": \"In vitro G-quartet formation assays combined with transcriptional reporter assays using engineered ILPR repeats\",\n      \"pmids\": [\"11070077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"G-quartet formation demonstrated in vitro; evidence for in vivo formation in chromatin context is absent\",\n        \"Identity of trans-acting factors recognizing G-quartet structures at the ILPR is unknown\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Fine-mapping of IDDM2 to a ~2-kb interval containing -23HphI, VNTR, and +1140A/C revealed that disease susceptibility could not be attributed exclusively to the VNTR, broadening the set of candidate causal variants at the INS locus.\",\n      \"evidence\": \"Systematic genotyping of 177 polymorphisms in up to 2,960 pedigrees with regression analysis\",\n      \"pmids\": [\"15220214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Linkage disequilibrium prevented definitive assignment of causality to a single variant\",\n        \"Functional consequences of +1140A/C were not tested\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that the -23HphI (IVS1-6A/T) variant controls alternative splicing of INS intron 1 and that the resulting mRNA isoforms differ in proinsulin output provided the first direct functional mechanism linking a non-VNTR IDDM2 variant to insulin biosynthesis.\",\n      \"evidence\": \"Minigene splicing reporters in multiple cell lines, beta-cell EST sequencing, and proinsulin secretion measurement\",\n      \"pmids\": [\"16380501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative contribution of splicing versus VNTR-mediated transcriptional effects in vivo is unresolved\",\n        \"Whether alternative 5′ leader length affects translational efficiency in primary beta cells was not tested\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying alpha3beta1 integrin–collagen interaction as an upstream regulator of FAK, Pdx-1, and insulin gene expression in INS-1 cells established an extracellular-matrix-dependent signaling axis that controls insulin transcription and glucose-stimulated secretion.\",\n      \"evidence\": \"Flow cytometry, adhesion assays, FAK phosphorylation Western blot, RT-PCR, ELISA, and GSIS with blocking antibody in INS-1 cells\",\n      \"pmids\": [\"19023675\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab using one cell line; validation in primary islets or in vivo is lacking\",\n        \"Downstream signaling intermediates between FAK and Pdx-1 transcription were not mapped\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified quantitative model integrating VNTR-mediated transcriptional regulation, ILPR G-quartet structure, intron 1 splicing control, and extracellular matrix signaling into a single framework explaining tissue-specific INS expression remains unestablished.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No study has simultaneously measured contributions of VNTR, -23HphI, and ILPR G-quartets in the same experimental system\",\n        \"In vivo relevance of G-quartet structures at the INS promoter is undemonstrated\",\n        \"Whether integrin–FAK signaling modulates the same cis-regulatory elements (VNTR/ILPR) is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ITGA3\",\n      \"ITGB1\",\n      \"PDX1\",\n      \"PTK2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Insulin is a peptide hormone encoded by the INS gene that serves as the master regulator of glucose homeostasis through receptor-mediated signaling in muscle, fat, liver, bone, and brain. Preproinsulin folds in the endoplasmic reticulum, assembles into zinc hexamers for regulated secretory storage, and is processed to mature insulin; missense mutations that disrupt folding cause ER stress and permanent neonatal diabetes [PMID:9631292, PMID:17855560]. Upon secretion, insulin binds its receptor tyrosine kinase to activate the PI3K/PKB(Akt) cascade, which inhibits GSK3 to promote glycogen synthesis, suppresses NFκB-driven inflammation, and—in osteoblasts—stimulates osteocalcin activation to coordinate systemic glucose metabolism [PMID:8524413, PMID:11443198, PMID:20655470]. INS transcription is regulated by the upstream VNTR/IDDM2 locus, where class III alleles drive higher thymic INS expression that promotes immune self-tolerance and protects against type 1 diabetes [PMID:7773291, PMID:9054944].\",\n  \"teleology\": [\n    {\n      \"year\": 1980,\n      \"claim\": \"Determining the genomic organization of human INS—two introns interrupting the coding sequence and upstream regulatory elements—established the physical framework needed to study its transcriptional regulation and processing.\",\n      \"evidence\": \"DNA sequencing and comparison with rat insulin gene\",\n      \"pmids\": [\"6243748\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional roles of intronic sequences not yet defined\", \"Upstream regulatory elements only identified, not functionally tested\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Two key mechanistic questions were resolved: (1) the IDDM2 susceptibility locus was mapped directly to the INS VNTR, linking allelic variation to transcriptional output and type 1 diabetes risk, and (2) insulin's metabolic signaling cascade was ordered—PI3K activates PKB/Akt, which inhibits GSK3 independently of MAPK pathways—explaining how insulin drives glycogen synthesis.\",\n      \"evidence\": \"Cross-match haplotype/LD mapping with in vivo INS mRNA quantification; in vivo kinase assays with PI3-kinase inhibitors and pharmacological blockade of parallel pathways\",\n      \"pmids\": [\"7773291\", \"8524413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which VNTR alleles alter transcription not yet identified\", \"Cell-type-specific differences in PI3K/Akt vs. MAPK usage not resolved\", \"Identity of tissues where VNTR-driven INS expression confers disease protection unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The discovery of INS expression in human fetal thymus—at levels controlled by VNTR class—provided a mechanistic explanation for the dominant protective effect of class III alleles: higher thymic insulin promotes central immune tolerance to insulin.\",\n      \"evidence\": \"RT-PCR quantification of INS mRNA in fetal thymus stratified by VNTR genotype\",\n      \"pmids\": [\"9054944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration of tolerogenic T-cell deletion in response to thymic insulin not shown\", \"Contribution of thymic INS expression relative to peripheral tolerance mechanisms unclear\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"The biosynthetic pathway from preproinsulin to stored mature hormone was consolidated: ER folding, proinsulin assembly into zinc hexamers, and regulated secretory granule maturation explained how beta cells produce and store active insulin.\",\n      \"evidence\": \"Structural, chemical, and genetic analyses including transgenic animals and transfected cells\",\n      \"pmids\": [\"9631292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific chaperones governing proinsulin folding in the ER not fully catalogued\", \"Mechanisms controlling hexamer-to-monomer conversion upon secretion not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of insulin as a physiological competitive substrate of insulin-degrading enzyme (IDE) revealed a clearance mechanism with implications for amyloid-beta metabolism, since insulin competitively blocks IDE-mediated Aβ degradation.\",\n      \"evidence\": \"Purification of IDE from conditioned medium, competitive substrate assay, immunodepletion\",\n      \"pmids\": [\"9830016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of insulin–Aβ competition for IDE not established\", \"Relative contribution of IDE versus other insulin-degrading pathways not quantified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"The mechanistic link between the VNTR and INS transcription was advanced by showing that ILPR repeats form G-quartet DNA structures whose stability correlates with transcriptional activity, providing a structural basis for allele-specific regulation.\",\n      \"evidence\": \"In vitro G-quartet formation assays combined with transcription reporter assays\",\n      \"pmids\": [\"11070077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"G-quartet formation demonstrated only in vitro; in vivo evidence lacking\", \"Trans-acting factors recognizing G-quartets at the ILPR not identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"The downstream signaling network was elaborated: insulin receptor activation branches into PI3K/Akt (glucose uptake, glycogen synthesis) and Ras/MAPK (gene expression) arms, and insulin was shown to exert direct anti-inflammatory effects via NFκB suppression and IκB induction in human mononuclear cells.\",\n      \"evidence\": \"Biochemical pathway analysis with receptor mutagenesis; controlled human insulin infusion with nuclear NFκB quantification and ROS/cytokine measurements\",\n      \"pmids\": [\"11742412\", \"11443198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of NFκB suppression by insulin not fully delineated\", \"Tissue-specific versus systemic contribution of anti-inflammatory insulin signaling unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The functional significance of insulin receptor isoforms was established: IR-A/IGF-IR hybrid receptors respond to insulin, IGF-I, and IGF-II, whereas IR-B hybrids respond primarily to IGF-I, explaining how receptor isoform expression dictates tissue-specific responses to circulating ligands.\",\n      \"evidence\": \"Cotransfection of IR isoforms with IGF-IR in R(−) cells, ligand binding, substrate phosphorylation, and proliferation/migration assays\",\n      \"pmids\": [\"12138094\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative abundance of hybrid receptor types in normal human tissues not quantified\", \"Downstream signaling specificity of hybrid versus homodimeric receptors not fully mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"A second functional IDDM2 variant was identified: the IVS1-6A/T (−23HphI) SNP controls alternative splicing of INS intron 1, with the A allele producing longer 5′ leader mRNAs that yield more proinsulin, linking splicing regulation to disease-associated variation in insulin output.\",\n      \"evidence\": \"Minigene splicing reporter in multiple cell lines with proinsulin secretion measurement\",\n      \"pmids\": [\"16380501\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effect size in primary beta cells not confirmed\", \"Interaction between −23HphI splicing effect and VNTR-mediated transcriptional regulation not dissected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Human genetics directly linked INS coding mutations to permanent neonatal diabetes: ten heterozygous preproinsulin mutations disrupt protein folding, cause ER stress, and kill beta cells—mirroring the Akita mouse—establishing misfolded proinsulin as a monogenic diabetes mechanism.\",\n      \"evidence\": \"Linkage analysis, candidate gene sequencing, structural modeling; corroboration with Akita and Munich mouse models\",\n      \"pmids\": [\"17855560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative relationship between ER stress burden and beta-cell death threshold not determined\", \"Potential for pharmacological chaperone rescue not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A novel endocrine circuit was uncovered: insulin signaling in osteoblasts promotes osteoclastic bone resorption, which decarboxylates and activates osteocalcin; active osteocalcin then feeds back to enhance whole-body glucose homeostasis, extending insulin's role beyond classical metabolic tissues.\",\n      \"evidence\": \"Osteoblast-specific insulin receptor knockout mice with osteocalcin carboxylation assays and glucose homeostasis measurements\",\n      \"pmids\": [\"20655470\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of bone-derived osteocalcin to systemic glucose control in humans not established\", \"Whether the insulin–osteocalcin axis is dysregulated in human diabetes not shown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The molecular basis of insulin resistance was integrated: lipid intermediates (ceramide, diacylglycerol) accumulate and impair the IR→IRS→Akt cascade, with adipose tissue dysfunction serving as a primary driver that propagates resistance to muscle, liver, and other tissues.\",\n      \"evidence\": \"Synthesis of human genetics, mouse models, and lipid intermediate measurements\",\n      \"pmids\": [\"34285405\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contributions of individual lipid species to signaling node inhibition not fully resolved\", \"Therapeutic targets within the ceramide pathway not validated in humans\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the precise ER chaperone network governing proinsulin folding, the in vivo role of G-quartet structures at the VNTR, the mechanistic basis of insulin's NFκB suppression, and whether pharmacological chaperones can rescue misfolded-proinsulin neonatal diabetes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Proinsulin ER folding chaperones incompletely identified\", \"In vivo evidence for G-quartet-mediated transcriptional regulation absent\", \"Molecular mechanism of insulin-driven NFκB suppression unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [2, 7, 8, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 7, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [5, 11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [4, 5, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 7, 9, 12, 14]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 7, 13]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 8]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 14]}\n    ],\n    \"complexes\": [\n      \"Zinc-insulin hexamer\"\n    ],\n    \"partners\": [\n      \"INSR\",\n      \"IDE\",\n      \"IGF1R\",\n      \"AKT1\",\n      \"GSK3B\",\n      \"PIK3CA\",\n      \"BGLAP\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}