{"gene":"NDUFB6","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2007,"finding":"A SNP in the NDUFB6 promoter (rs629566, A/G) creates a CpG methylation site; elderly individuals carrying the G/G genotype show increased DNA methylation at this promoter site, and this increased methylation is negatively correlated with NDUFB6 mRNA expression in skeletal muscle, linking epigenetic modification to age-dependent decline in NDUFB6 transcription and reduced insulin sensitivity.","method":"Promoter methylation analysis by bisulfite sequencing, genotyping of promoter SNP rs629566, gene expression quantification in human skeletal muscle biopsies from twins, correlation with insulin sensitivity measures","journal":"The Journal of Clinical Investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter methylation measurement linked to expression and genotype in human tissue, single lab with multiple orthogonal methods (genotyping, bisulfite sequencing, expression analysis, heritability estimation in twins)","pmids":["17948130"],"is_preprint":false},{"year":2010,"finding":"A high-fat isocaloric diet in rats reduces NDUFB6 mRNA expression in epididymal adipose tissue, accompanied by changes in CpG methylation patterns in the NDUFB6 promoter region, suggesting that dietary macronutrient composition can epigenetically regulate NDUFB6 transcription in adipose tissue.","method":"Pair-fed rat dietary intervention, qRT-PCR for NDUFB6 expression in adipose tissue, bisulfite sequencing of NDUFB6 promoter CpG islands","journal":"Molecular Genetics and Metabolism","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single dietary intervention model, correlative methylation/expression relationship without direct functional manipulation of NDUFB6","pmids":["20729114"],"is_preprint":false},{"year":2010,"finding":"A high-sucrose isocaloric diet in rats reduces NDUFB6 gene expression in epididymal adipose tissue, consistent with mitochondrial electron transport chain dysfunction in adipose tissue under high-sugar dietary conditions.","method":"Pair-fed rat dietary intervention, gene expression analysis of NDUFB6 in epididymal adipose tissue","journal":"Journal of Nutrigenetics and Nutrigenomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (expression measurement), no direct mechanistic manipulation of NDUFB6 protein or promoter","pmids":["20559011"],"is_preprint":false}],"current_model":"NDUFB6 is a subunit of mitochondrial respiratory chain Complex I whose expression in skeletal muscle and adipose tissue is regulated by both genetic (a promoter SNP rs629566) and epigenetic (DNA methylation) mechanisms; age-dependent promoter hypermethylation at a SNP-created CpG site reduces NDUFB6 expression and is associated with decreased insulin sensitivity, while high-fat and high-sucrose diets also reduce NDUFB6 expression in adipose tissue with associated promoter methylation changes."},"narrative":{"mechanistic_narrative":"NDUFB6 is a subunit of the mitochondrial respiratory chain Complex I whose transcription in metabolically active tissues is governed by combined genetic and epigenetic control [PMID:17948130]. A promoter SNP (rs629566) creates a CpG methylation site, and in elderly G/G-genotype individuals age-dependent hypermethylation at this site is negatively correlated with NDUFB6 mRNA in skeletal muscle and tracks with reduced insulin sensitivity, linking epigenetic silencing of this Complex I subunit to age-related metabolic decline [PMID:17948130]. Dietary manipulation reinforces this regulatory axis: isocaloric high-fat feeding in rats lowers adipose NDUFB6 expression with concurrent promoter CpG methylation changes [PMID:20729114], and high-sucrose feeding likewise reduces adipose NDUFB6 expression consistent with electron transport chain dysfunction [PMID:20559011]. Beyond this transcriptional/epigenetic regulation and its association with insulin sensitivity, the available corpus does not characterize the biochemical assembly, structure, or catalytic contribution of the NDUFB6 protein within Complex I.","teleology":[{"year":2007,"claim":"Established that NDUFB6 expression is under combined genetic and epigenetic control by showing that a promoter SNP creates a CpG site whose age-dependent methylation suppresses transcription and tracks with insulin sensitivity.","evidence":"Genotyping of rs629566, bisulfite sequencing, and expression analysis in human skeletal muscle biopsies from twins, correlated with insulin sensitivity measures","pmids":["17948130"],"confidence":"Medium","gaps":["Does not establish whether reduced NDUFB6 alters Complex I assembly or activity","Correlative link between methylation, expression, and insulin sensitivity without causal manipulation","Mechanism by which methylation represses the promoter not defined"]},{"year":2010,"claim":"Extended epigenetic regulation of NDUFB6 to a dietary input by showing that high-fat feeding reduces adipose expression alongside promoter methylation changes.","evidence":"Pair-fed rat high-fat dietary intervention with qRT-PCR and bisulfite sequencing of the NDUFB6 promoter in epididymal adipose tissue","pmids":["20729114"],"confidence":"Low","gaps":["Correlative methylation/expression relationship without direct functional manipulation of NDUFB6","Single dietary model in rat; tissue specificity beyond adipose not addressed","Causal direction between methylation and expression not established"]},{"year":2010,"claim":"Showed that a second dietary perturbation, high-sucrose feeding, also lowers adipose NDUFB6 expression, generalizing the dietary sensitivity of this Complex I subunit.","evidence":"Pair-fed rat high-sucrose dietary intervention with gene expression analysis in epididymal adipose tissue","pmids":["20559011"],"confidence":"Low","gaps":["Single expression-only readout with no mechanistic manipulation of NDUFB6 protein or promoter","No methylation data to connect to the promoter regulatory model","Functional consequence for mitochondrial respiration not measured"]},{"year":null,"claim":"The biochemical role of the NDUFB6 protein within Complex I — its assembly position, structural contribution, and the consequence of its loss for respiratory function — remains uncharacterized in the available corpus.","evidence":"","pmids":[],"confidence":"Low","gaps":["No direct evidence of NDUFB6 protein incorporation into or requirement for Complex I assembly","No structural or interaction data for the protein","Causal effect of NDUFB6 reduction on insulin sensitivity not demonstrated"]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["mitochondrial respiratory chain Complex I"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95139","full_name":"NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit 6","aliases":["Complex I-B17","CI-B17","NADH-ubiquinone oxidoreductase B17 subunit"],"length_aa":128,"mass_kda":15.5,"function":"Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/O95139/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NDUFB6","classification":"Not Classified","n_dependent_lines":565,"n_total_lines":1208,"dependency_fraction":0.46771523178807944},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EMC3","stoichiometry":0.2},{"gene":"SNX17","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NDUFB6","total_profiled":1310},"omim":[{"mim_id":"603322","title":"NADH-UBIQUINONE OXIDOREDUCTASE 1 BETA SUBCOMPLEX, 6; NDUFB6","url":"https://www.omim.org/entry/603322"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NDUFB6"},"hgnc":{"alias_symbol":["B17","CI"],"prev_symbol":[]},"alphafold":{"accession":"O95139","domains":[{"cath_id":"1.20.5","chopping":"61-96","consensus_level":"medium","plddt":93.2067,"start":61,"end":96}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95139","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95139-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95139-F1-predicted_aligned_error_v6.png","plddt_mean":90.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NDUFB6","jax_strain_url":"https://www.jax.org/strain/search?query=NDUFB6"},"sequence":{"accession":"O95139","fasta_url":"https://rest.uniprot.org/uniprotkb/O95139.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95139/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95139"}},"corpus_meta":[{"pmid":"16339192","id":"PMC_16339192","title":"Signaling from Smo to Ci/Gli: conservation and divergence of Hedgehog pathways from Drosophila to vertebrates.","date":"2006","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16339192","citation_count":387,"is_preprint":false},{"pmid":"16009947","id":"PMC_16009947","title":"Phase I and pharmacodynamic study of the oral MEK inhibitor CI-1040 in patients with advanced malignancies.","date":"2005","source":"Journal of clinical oncology : official journal of the American Society of Clinical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/16009947","citation_count":333,"is_preprint":false},{"pmid":"11353333","id":"PMC_11353333","title":"Apolipoproteins C-I and C-III as important modulators of lipoprotein metabolism.","date":"2001","source":"Current opinion in lipidology","url":"https://pubmed.ncbi.nlm.nih.gov/11353333","citation_count":240,"is_preprint":false},{"pmid":"14613031","id":"PMC_14613031","title":"CI-1040 (PD184352), a targeted signal transduction inhibitor of MEK (MAPKK).","date":"2003","source":"Seminars in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/14613031","citation_count":216,"is_preprint":false},{"pmid":"16740475","id":"PMC_16740475","title":"A hedgehog-induced BTB protein modulates hedgehog signaling by degrading Ci/Gli transcription factor.","date":"2006","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/16740475","citation_count":200,"is_preprint":false},{"pmid":"11754822","id":"PMC_11754822","title":"Drosophila scavenger receptor CI is a pattern recognition receptor for bacteria.","date":"2001","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/11754822","citation_count":200,"is_preprint":false},{"pmid":"7732030","id":"PMC_7732030","title":"Expression cloning of dSR-CI, a class C macrophage-specific scavenger receptor from Drosophila melanogaster.","date":"1995","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/7732030","citation_count":194,"is_preprint":false},{"pmid":"2384212","id":"PMC_2384212","title":"Repression of ci-D in posterior compartments of Drosophila by engrailed.","date":"1990","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/2384212","citation_count":190,"is_preprint":false},{"pmid":"28255005","id":"PMC_28255005","title":"International Union of Basic and Clinical Pharmacology. 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biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/3106042","citation_count":39,"is_preprint":false},{"pmid":"10077328","id":"PMC_10077328","title":"Immunohistochemical and neurochemical studies on nigral and striatal functions in the circling (ci) rat, a genetic animal model with spontaneous rotational behavior.","date":"1999","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/10077328","citation_count":39,"is_preprint":false},{"pmid":"6323223","id":"PMC_6323223","title":"CI-906 and CI-907: new orally active nonsulfhydryl angiotensin-converting enzyme inhibitors.","date":"1984","source":"Federation proceedings","url":"https://pubmed.ncbi.nlm.nih.gov/6323223","citation_count":38,"is_preprint":false},{"pmid":"25512501","id":"PMC_25512501","title":"Hedgehog-induced phosphorylation by CK1 sustains the activity of Ci/Gli activator.","date":"2014","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/25512501","citation_count":37,"is_preprint":false},{"pmid":"7990137","id":"PMC_7990137","title":"DNA conformational changes associated with the cooperative binding of cI-repressor of bacteriophage lambda to OR.","date":"1994","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/7990137","citation_count":36,"is_preprint":false},{"pmid":"28417425","id":"PMC_28417425","title":"Overexpression of OsHSP18.0-CI Enhances Resistance to Bacterial Leaf Streak in Rice.","date":"2017","source":"Rice (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/28417425","citation_count":36,"is_preprint":false},{"pmid":"19181516","id":"PMC_19181516","title":"The bacteriophage lambda CI protein finds an asymmetric solution.","date":"2009","source":"Current opinion in structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/19181516","citation_count":35,"is_preprint":false},{"pmid":"10334627","id":"PMC_10334627","title":"Comparison of mutant frequencies at the transgenic lambda LacI and cII/cI loci in control and ENU-treated Big Blue mice.","date":"1999","source":"Environmental and molecular mutagenesis","url":"https://pubmed.ncbi.nlm.nih.gov/10334627","citation_count":35,"is_preprint":false},{"pmid":"26878328","id":"PMC_26878328","title":"Low-Lying π* Resonances of Standard and Rare DNA and RNA Bases Studied by the Projected CAP/SAC-CI Method.","date":"2016","source":"The journal of physical chemistry. A","url":"https://pubmed.ncbi.nlm.nih.gov/26878328","citation_count":35,"is_preprint":false},{"pmid":"16595130","id":"PMC_16595130","title":"Regulation of Ci and Su(fu) nuclear import in Drosophila.","date":"2006","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/16595130","citation_count":34,"is_preprint":false},{"pmid":"35613054","id":"PMC_35613054","title":"The HDAC inhibitor CI-994 acts as a molecular memory aid by facilitating synaptic and intracellular communication after learning.","date":"2022","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/35613054","citation_count":33,"is_preprint":false},{"pmid":"26663757","id":"PMC_26663757","title":"Spatiotemporal Resolution of Rab9 and CI-MPR Dynamics in the Endocytic Pathway.","date":"2016","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/26663757","citation_count":32,"is_preprint":false},{"pmid":"27809523","id":"PMC_27809523","title":"Similarities and Differences between RNA and DNA Double-Helical Structures in Circular Dichroism Spectroscopy: A SAC-CI Study.","date":"2016","source":"The journal of physical chemistry. A","url":"https://pubmed.ncbi.nlm.nih.gov/27809523","citation_count":32,"is_preprint":false},{"pmid":"35657932","id":"PMC_35657932","title":"CI-SpliceAI-Improving machine learning predictions of disease causing splicing variants using curated alternative splice sites.","date":"2022","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/35657932","citation_count":31,"is_preprint":false},{"pmid":"10525197","id":"PMC_10525197","title":"Identification and developmental expression of Ci-msxb: a novel homologue of Drosophila msh gene in Ciona intestinalis.","date":"1999","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/10525197","citation_count":31,"is_preprint":false},{"pmid":"23382214","id":"PMC_23382214","title":"Enhancer-like long-range transcriptional activation by λ CI-mediated DNA looping.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/23382214","citation_count":31,"is_preprint":false},{"pmid":"24130883","id":"PMC_24130883","title":"Combination of rapamycin, CI-1040, and 17-AAG inhibits metastatic capacity of prostate cancer via Slug inhibition.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24130883","citation_count":29,"is_preprint":false},{"pmid":"27976371","id":"PMC_27976371","title":"Apolipoprotein C-I plays a role in the pathogenesis of glomerulosclerosis.","date":"2017","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/27976371","citation_count":29,"is_preprint":false},{"pmid":"9858732","id":"PMC_9858732","title":"Identification and developmental expression of Ci-isl, a homologue of vertebrate islet genes, in the ascidian Ciona intestinalis.","date":"1998","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/9858732","citation_count":27,"is_preprint":false},{"pmid":"24527387","id":"PMC_24527387","title":"Debra-mediated Ci degradation controls tissue homeostasis in Drosophila adult midgut.","date":"2014","source":"Stem cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/24527387","citation_count":26,"is_preprint":false},{"pmid":"15135162","id":"PMC_15135162","title":"The effect of CGX-1007 and CI-1041, novel NMDA receptor antagonists, on kindling acquisition and expression.","date":"2004","source":"Epilepsy research","url":"https://pubmed.ncbi.nlm.nih.gov/15135162","citation_count":26,"is_preprint":false},{"pmid":"18992221","id":"PMC_18992221","title":"Apolipoprotein CI inhibits scavenger receptor BI and increases plasma HDL levels in vivo.","date":"2008","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/18992221","citation_count":26,"is_preprint":false},{"pmid":"20559011","id":"PMC_20559011","title":"A high-sucrose isocaloric pair-fed model induces obesity and impairs NDUFB6 gene function in rat adipose tissue.","date":"2010","source":"Journal of nutrigenetics and nutrigenomics","url":"https://pubmed.ncbi.nlm.nih.gov/20559011","citation_count":25,"is_preprint":false},{"pmid":"32462553","id":"PMC_32462553","title":"OsHsfB4d Binds the Promoter and Regulates the Expression of OsHsp18.0-CI to Resistant Against Xanthomonas Oryzae.","date":"2020","source":"Rice (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/32462553","citation_count":25,"is_preprint":false},{"pmid":"9382827","id":"PMC_9382827","title":"Hedgehog signalling: Ci complex cuts and clasps.","date":"1997","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/9382827","citation_count":25,"is_preprint":false},{"pmid":"36902058","id":"PMC_36902058","title":"LPS Triggers Acute Neuroinflammation and Parkinsonism Involving NLRP3 Inflammasome Pathway and Mitochondrial CI Dysfunction in the Rat.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36902058","citation_count":23,"is_preprint":false},{"pmid":"17505003","id":"PMC_17505003","title":"Phase I clinical and pharmacodynamic evaluation of oral CI-1033 in patients with refractory cancer.","date":"2007","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/17505003","citation_count":23,"is_preprint":false},{"pmid":"8473337","id":"PMC_8473337","title":"Interference by PR-bound RNA polymerase with PRM function in vitro. Modulation by the bacteriophage lambda cI protein.","date":"1993","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8473337","citation_count":22,"is_preprint":false},{"pmid":"15488529","id":"PMC_15488529","title":"Nonspecific binding of the OR repressors CI and Cro of bacteriophage lambda.","date":"2004","source":"Journal of theoretical biology","url":"https://pubmed.ncbi.nlm.nih.gov/15488529","citation_count":21,"is_preprint":false},{"pmid":"16219040","id":"PMC_16219040","title":"Ci-Rga, a gene encoding an MtN3/saliva family transmembrane protein, is essential for tissue differentiation during embryogenesis of the ascidian Ciona intestinalis.","date":"2005","source":"Differentiation; research in biological diversity","url":"https://pubmed.ncbi.nlm.nih.gov/16219040","citation_count":21,"is_preprint":false},{"pmid":"16478678","id":"PMC_16478678","title":"Apolipoprotein CI causes hypertriglyceridemia independent of the very-low-density lipoprotein receptor and apolipoprotein CIII in mice.","date":"2006","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/16478678","citation_count":21,"is_preprint":false},{"pmid":"15013810","id":"PMC_15013810","title":"Regulatory elements controlling Ci-msxb tissue-specific expression during Ciona intestinalis embryonic development.","date":"2004","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/15013810","citation_count":21,"is_preprint":false},{"pmid":"8915967","id":"PMC_8915967","title":"Cell volume increases of physiologic amplitude activate basolateral K and CI conductances in the rabbit proximal convoluted tubule.","date":"1996","source":"Journal of the American Society of Nephrology : JASN","url":"https://pubmed.ncbi.nlm.nih.gov/8915967","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48091,"output_tokens":1140,"usd":0.080686,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7386,"output_tokens":1541,"usd":0.037727,"stage2_stop_reason":"end_turn"},"total_usd":0.118413,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the 100 papers, I need to identify which ones are actually about NDUFB6 (NADH:ubiquinone oxidoreductase subunit B6, a component of mitochondrial Complex I).\n\nAfter careful review, only two papers (PMIDs 17948130 and 20729114 and 20559011) are genuinely about NDUFB6. The vast majority of papers are about completely unrelated genes/proteins that share the alias \"CI\" (e.g., Cubitus interruptus/Gli in Hedgehog signaling, bacteriophage lambda cI repressor, ApoC-I lipoprotein, MEK inhibitor CI-1040, various pharmacological CI-numbered compounds, Ciona intestinalis genes, etc.).\n\nLet me extract the mechanistic findings from the NDUFB6-relevant papers:\n\n- PMID 17948130: Genetic and epigenetic regulation of NDUFB6 expression in human skeletal muscle\n- PMID 20729114: NDUFB6 promoter methylation in rat adipose tissue with high-fat diet\n- PMID 20559011: NDUFB6 expression in adipose tissue with high-sucrose diet\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"A SNP in the NDUFB6 promoter (rs629566, A/G) creates a CpG methylation site; elderly individuals carrying the G/G genotype show increased DNA methylation at this promoter site, and this increased methylation is negatively correlated with NDUFB6 mRNA expression in skeletal muscle, linking epigenetic modification to age-dependent decline in NDUFB6 transcription and reduced insulin sensitivity.\",\n      \"method\": \"Promoter methylation analysis by bisulfite sequencing, genotyping of promoter SNP rs629566, gene expression quantification in human skeletal muscle biopsies from twins, correlation with insulin sensitivity measures\",\n      \"journal\": \"The Journal of Clinical Investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter methylation measurement linked to expression and genotype in human tissue, single lab with multiple orthogonal methods (genotyping, bisulfite sequencing, expression analysis, heritability estimation in twins)\",\n      \"pmids\": [\"17948130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A high-fat isocaloric diet in rats reduces NDUFB6 mRNA expression in epididymal adipose tissue, accompanied by changes in CpG methylation patterns in the NDUFB6 promoter region, suggesting that dietary macronutrient composition can epigenetically regulate NDUFB6 transcription in adipose tissue.\",\n      \"method\": \"Pair-fed rat dietary intervention, qRT-PCR for NDUFB6 expression in adipose tissue, bisulfite sequencing of NDUFB6 promoter CpG islands\",\n      \"journal\": \"Molecular Genetics and Metabolism\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single dietary intervention model, correlative methylation/expression relationship without direct functional manipulation of NDUFB6\",\n      \"pmids\": [\"20729114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A high-sucrose isocaloric diet in rats reduces NDUFB6 gene expression in epididymal adipose tissue, consistent with mitochondrial electron transport chain dysfunction in adipose tissue under high-sugar dietary conditions.\",\n      \"method\": \"Pair-fed rat dietary intervention, gene expression analysis of NDUFB6 in epididymal adipose tissue\",\n      \"journal\": \"Journal of Nutrigenetics and Nutrigenomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (expression measurement), no direct mechanistic manipulation of NDUFB6 protein or promoter\",\n      \"pmids\": [\"20559011\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NDUFB6 is a subunit of mitochondrial respiratory chain Complex I whose expression in skeletal muscle and adipose tissue is regulated by both genetic (a promoter SNP rs629566) and epigenetic (DNA methylation) mechanisms; age-dependent promoter hypermethylation at a SNP-created CpG site reduces NDUFB6 expression and is associated with decreased insulin sensitivity, while high-fat and high-sucrose diets also reduce NDUFB6 expression in adipose tissue with associated promoter methylation changes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NDUFB6 is a subunit of the mitochondrial respiratory chain Complex I whose transcription in metabolically active tissues is governed by combined genetic and epigenetic control [#0]. A promoter SNP (rs629566) creates a CpG methylation site, and in elderly G/G-genotype individuals age-dependent hypermethylation at this site is negatively correlated with NDUFB6 mRNA in skeletal muscle and tracks with reduced insulin sensitivity, linking epigenetic silencing of this Complex I subunit to age-related metabolic decline [#0]. Dietary manipulation reinforces this regulatory axis: isocaloric high-fat feeding in rats lowers adipose NDUFB6 expression with concurrent promoter CpG methylation changes [#1], and high-sucrose feeding likewise reduces adipose NDUFB6 expression consistent with electron transport chain dysfunction [#2]. Beyond this transcriptional/epigenetic regulation and its association with insulin sensitivity, the available corpus does not characterize the biochemical assembly, structure, or catalytic contribution of the NDUFB6 protein within Complex I.\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that NDUFB6 expression is under combined genetic and epigenetic control by showing that a promoter SNP creates a CpG site whose age-dependent methylation suppresses transcription and tracks with insulin sensitivity.\",\n      \"evidence\": \"Genotyping of rs629566, bisulfite sequencing, and expression analysis in human skeletal muscle biopsies from twins, correlated with insulin sensitivity measures\",\n      \"pmids\": [\"17948130\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Does not establish whether reduced NDUFB6 alters Complex I assembly or activity\",\n        \"Correlative link between methylation, expression, and insulin sensitivity without causal manipulation\",\n        \"Mechanism by which methylation represses the promoter not defined\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended epigenetic regulation of NDUFB6 to a dietary input by showing that high-fat feeding reduces adipose expression alongside promoter methylation changes.\",\n      \"evidence\": \"Pair-fed rat high-fat dietary intervention with qRT-PCR and bisulfite sequencing of the NDUFB6 promoter in epididymal adipose tissue\",\n      \"pmids\": [\"20729114\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Correlative methylation/expression relationship without direct functional manipulation of NDUFB6\",\n        \"Single dietary model in rat; tissue specificity beyond adipose not addressed\",\n        \"Causal direction between methylation and expression not established\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that a second dietary perturbation, high-sucrose feeding, also lowers adipose NDUFB6 expression, generalizing the dietary sensitivity of this Complex I subunit.\",\n      \"evidence\": \"Pair-fed rat high-sucrose dietary intervention with gene expression analysis in epididymal adipose tissue\",\n      \"pmids\": [\"20559011\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Single expression-only readout with no mechanistic manipulation of NDUFB6 protein or promoter\",\n        \"No methylation data to connect to the promoter regulatory model\",\n        \"Functional consequence for mitochondrial respiration not measured\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical role of the NDUFB6 protein within Complex I — its assembly position, structural contribution, and the consequence of its loss for respiratory function — remains uncharacterized in the available corpus.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct evidence of NDUFB6 protein incorporation into or requirement for Complex I assembly\",\n        \"No structural or interaction data for the protein\",\n        \"Causal effect of NDUFB6 reduction on insulin sensitivity not demonstrated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [\"mitochondrial respiratory chain Complex I\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"loss","faith_supported":3,"faith_total":3,"faith_pct":100.0}}