{"gene":"PPARGC1B","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":2002,"finding":"PPARGC1B (PERC) selectively coactivates estrogen receptor alpha (ERα) but not ERβ through a bipartite transcriptional activation domain and two LXXLL motifs that interact with the AF2 domain of ERα in an estrogen-dependent manner.","method":"Co-transfection reporter assays, LXXLL motif mutagenesis, in vitro binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (reporter assay, mutagenesis, binding assay) in a single well-controlled study with 189 citations","pmids":["11854298"],"is_preprint":false},{"year":2002,"finding":"PPARGC1B (PERC) directly interacts with and potently coactivates the orphan nuclear receptor ERRγ via its AF-2 domain, as shown by in vitro interaction experiments and cell-based reporter assays.","method":"In vitro protein interaction assay, co-transfection luciferase reporter assay, receptor truncation analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct interaction shown in vitro plus functional reporter assay, single lab","pmids":["12470660"],"is_preprint":false},{"year":2016,"finding":"The PPARGC1B exon 5 variant +102525A allele enhances ERα transcriptional activity and physically interacts more strongly with ERα than the +102525G allele following 17β-estradiol treatment, as demonstrated by luciferase reporter and co-precipitation assays.","method":"Luciferase reporter assay, co-immunoprecipitation (co-precipitation assay) in 293T cells","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — two orthogonal methods (reporter + co-IP), single lab","pmids":["27027322"],"is_preprint":false},{"year":2016,"finding":"PPARGC1B mediates 17β-estradiol (E2)-dependent enhancement of mitochondrial biogenesis and function in hepatocytes; siRNA knockdown of PPARGC1B (but not PGC1A) abolished E2-induced improvements in mitochondrial content and oxidative capacity in HepG2 cells.","method":"siRNA knockdown, mitochondrial biogenesis/function assays in HepG2 hepatocytes and ovariectomized rat model","journal":"The Journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype, in vitro and in vivo model, single lab","pmids":["27885055"],"is_preprint":false},{"year":2018,"finding":"ZFP36L1 post-transcriptionally suppresses PPARGC1B by targeting adenylate-uridylate-rich elements (AREs) in the 3'-UTR of PPARGC1B mRNA; knockdown of PPARGC1B impairs adipogenic differentiation of bone marrow mesenchymal stem cells.","method":"Lentivirus-mediated ZFP36L1 knockdown and overexpression, PPARGC1B knockdown, adipogenesis assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined phenotypic readout, multiple genetic perturbations, single lab","pmids":["29993187"],"is_preprint":false},{"year":2024,"finding":"The rs10071329 variant in PPARGC1B acts as a cis-eQTL; CRISPR/Cas9 allele switching from A/A to G/G in a human brown adipocyte cell line increased PPARGC1B expression, enhanced mitochondria-encoded gene expression, improved basal and norepinephrine-stimulated mitochondrial respiration, and increased norepinephrine-stimulated lipolysis.","method":"CRISPR/Cas9 scarless allele editing, RNA-seq, mitochondrial respiration assays (Seahorse), glycerol release assay","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1–2 — CRISPR allele editing with multiple orthogonal functional readouts in a single study","pmids":["38190589"],"is_preprint":false},{"year":2011,"finding":"Genetic polymorphisms in PPARGC1B (including promoter variant -427C>T) modulate PPARGC1B mRNA levels and promoter activity in airway cells; EMSA demonstrated that the -427C allele exhibits stronger binding to a nuclear protein than the -427T allele, linking PPARGC1B expression level to airway hyperreactivity.","method":"Luciferase reporter assay, EMSA, real-time PCR of mRNA levels in human subjects","journal":"Clinical and experimental allergy","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods (EMSA, reporter assay, mRNA quantification), single lab","pmids":["21692888"],"is_preprint":false},{"year":2011,"finding":"Estrogen (E2) treatment of MCF-7 cells induces PPARGC1B expression and enhances occupancies of ERα and RNA polymerase II within a PPARGC1B genomic region, suggesting a feed-forward regulatory loop between ESR1 and PPARGC1B.","method":"ChIP assay, RT-PCR in MCF-7 cells after estrogen treatment","journal":"Breast cancer research : BCR","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP with functional context, single lab","pmids":["21269472"],"is_preprint":false}],"current_model":"PPARGC1B (PGC-1β/PERC) is a transcriptional coactivator that selectively enhances ERα and ERRγ activity via LXXLL motif–AF2 domain interactions, drives mitochondrial biogenesis and function downstream of estrogen signaling (particularly in liver and brown adipose tissue), and is itself subject to post-transcriptional regulation by ZFP36L1 targeting its 3'-UTR AREs, with its expression level controlled in part by cis-acting genetic variants (e.g., rs10071329) that alter brown adipocyte mitochondrial respiration and lipolysis."},"narrative":{"teleology":[{"year":2002,"claim":"Identifying PPARGC1B as a nuclear receptor coactivator resolved the question of whether a PGC-1α paralog exists that selectively engages ERα over ERβ, establishing that PPARGC1B uses two LXXLL motifs to bind the ERα AF2 domain in an estrogen-dependent manner.","evidence":"Co-transfection reporter assays, LXXLL mutagenesis, and in vitro binding assays","pmids":["11854298"],"confidence":"High","gaps":["Whether PPARGC1B coactivates other nuclear receptors beyond ERα was not tested","Endogenous chromatin context was not addressed","No in vivo functional data provided"]},{"year":2002,"claim":"Extending the receptor repertoire, PPARGC1B was shown to potently coactivate the orphan receptor ERRγ via its AF-2 domain, broadening the functional scope of PGC-1β beyond estrogen receptors.","evidence":"In vitro protein interaction assay and luciferase reporter assay with receptor truncation analysis","pmids":["12470660"],"confidence":"Medium","gaps":["Endogenous target genes of the PPARGC1B–ERRγ axis were not identified","Physiological tissue context was unexplored","No loss-of-function validation"]},{"year":2011,"claim":"ChIP experiments revealed that estrogen induces PPARGC1B expression itself via ERα and RNA Pol II recruitment to the PPARGC1B locus, establishing a feed-forward loop in which ERα both recruits PPARGC1B as a coactivator and transcriptionally upregulates it.","evidence":"ChIP assay and RT-PCR in MCF-7 breast cancer cells treated with estrogen","pmids":["21269472"],"confidence":"Medium","gaps":["Whether this feed-forward loop operates in non-cancer, primary cells was not shown","The specific ERα binding site within the PPARGC1B locus was not mapped at high resolution","Functional consequence of disrupting the loop was not tested"]},{"year":2011,"claim":"Promoter variants in PPARGC1B were shown to alter transcription factor binding affinity and mRNA levels, linking PPARGC1B expression regulation to a physiological phenotype (airway hyperreactivity) for the first time.","evidence":"EMSA, luciferase reporter assays, and RT-PCR of mRNA in human subjects","pmids":["21692888"],"confidence":"Medium","gaps":["The transcription factor binding the −427C allele was not identified","Mechanism linking PPARGC1B expression to airway phenotype was not dissected","Small subject cohort limits generalizability"]},{"year":2016,"claim":"A coding variant in PPARGC1B exon 5 was shown to modulate the strength of the physical ERα–PPARGC1B interaction and downstream transcriptional output, providing the first evidence that natural human PPARGC1B variation directly tunes coactivator–receptor coupling.","evidence":"Luciferase reporter assay and co-immunoprecipitation in 293T cells after estradiol treatment","pmids":["27027322"],"confidence":"Medium","gaps":["Structural basis for differential ERα binding by the two alleles was not resolved","Downstream physiological consequences of allele-specific coactivation were not tested","Endogenous expression context was not examined"]},{"year":2016,"claim":"siRNA knockdown established that PPARGC1B, rather than PGC-1α, is the essential mediator of estrogen-driven mitochondrial biogenesis and oxidative capacity in hepatocytes, directly linking its coactivator role to mitochondrial function.","evidence":"siRNA knockdown of PPARGC1B in HepG2 cells with mitochondrial content and respiration assays; corroborated in ovariectomized rat model","pmids":["27885055"],"confidence":"Medium","gaps":["The nuclear receptor partner through which PPARGC1B drives hepatic mitochondrial biogenesis was not identified","Rescue experiment with re-expression of PPARGC1B was not performed","Chronic in vivo consequences of PPARGC1B loss in liver were not examined"]},{"year":2018,"claim":"Identification of ZFP36L1 as a post-transcriptional suppressor of PPARGC1B via 3′-UTR AU-rich elements revealed a layer of mRNA stability control and linked PPARGC1B levels to adipogenic differentiation capacity.","evidence":"Lentiviral ZFP36L1 and PPARGC1B knockdown/overexpression with adipogenesis assays in bone marrow mesenchymal stem cells","pmids":["29993187"],"confidence":"Medium","gaps":["Direct binding of ZFP36L1 to PPARGC1B 3′-UTR AREs was not shown by CLIP or electrophoretic mobility shift","Whether other RNA-binding proteins also regulate PPARGC1B mRNA stability was not addressed","Mechanism by which PPARGC1B supports adipogenesis was not dissected"]},{"year":2024,"claim":"CRISPR allele editing of the cis-eQTL rs10071329 demonstrated that PPARGC1B expression level causally controls mitochondria-encoded gene expression, mitochondrial respiration, and norepinephrine-stimulated lipolysis in human brown adipocytes, directly linking genetic regulation of PPARGC1B dosage to thermogenic adipocyte function.","evidence":"CRISPR/Cas9 scarless allele switching in a human brown adipocyte cell line with RNA-seq, Seahorse respirometry, and glycerol release assays","pmids":["38190589"],"confidence":"High","gaps":["Mechanism by which increased PPARGC1B protein upregulates mitochondria-encoded genes (direct coactivation vs. indirect effects) was not resolved","In vivo relevance of rs10071329 in human brown fat thermogenesis is unknown","Downstream transcription factor partner mediating these effects in brown adipocytes was not identified"]},{"year":null,"claim":"The nuclear receptor partner(s) through which PPARGC1B drives mitochondrial gene programs in brown adipocytes and hepatocytes, the structural basis for receptor selectivity, and the full spectrum of tissues in which PPARGC1B versus PGC-1α are the dominant coactivator remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No crystal or cryo-EM structure of PPARGC1B–receptor complex exists","Genome-wide binding profiles (ChIP-seq) for PPARGC1B are lacking","Tissue-specific knockout models have not been reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,3]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,7]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,5]}],"complexes":[],"partners":["ESR1","ESRRG","ZFP36L1"],"other_free_text":[]},"mechanistic_narrative":"PPARGC1B (PGC-1β/PERC) is a transcriptional coactivator that selectively coactivates estrogen receptor alpha (ERα) and the orphan nuclear receptor ERRγ through LXXLL motif–AF2 domain interactions, functioning in an estrogen-dependent manner [PMID:11854298, PMID:12470660]. Estrogen signaling induces PPARGC1B expression via ERα occupancy at its genomic locus, establishing a feed-forward regulatory loop, and PPARGC1B in turn drives mitochondrial biogenesis and oxidative capacity in hepatocytes downstream of 17β-estradiol [PMID:21269472, PMID:27885055]. Cis-regulatory genetic variants (e.g., rs10071329) modulate PPARGC1B expression levels and thereby control mitochondria-encoded gene expression, mitochondrial respiration, and norepinephrine-stimulated lipolysis in brown adipocytes [PMID:38190589]. PPARGC1B mRNA is post-transcriptionally suppressed by ZFP36L1 through AU-rich elements in its 3′-UTR, and its knockdown impairs adipogenic differentiation of bone marrow mesenchymal stem cells [PMID:29993187]."},"prefetch_data":{"uniprot":{"accession":"Q86YN6","full_name":"Peroxisome proliferator-activated receptor gamma coactivator 1-beta","aliases":["PGC-1-related estrogen receptor alpha coactivator"],"length_aa":1023,"mass_kda":113.2,"function":"Plays a role of stimulator of transcription factors and nuclear receptors activities. Activates transcriptional activity of estrogen receptor alpha, nuclear respiratory factor 1 (NRF1) and glucocorticoid receptor in the presence of glucocorticoids. May play a role in constitutive non-adrenergic-mediated mitochondrial biogenesis as suggested by increased basal oxygen consumption and mitochondrial number when overexpressed. May be involved in fat oxidation and non-oxidative glucose metabolism and in the regulation of energy expenditure. Induces the expression of PERM1 in the skeletal muscle in an ESRRA-dependent manner","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q86YN6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PPARGC1B","classification":"Not Classified","n_dependent_lines":497,"n_total_lines":1208,"dependency_fraction":0.41142384105960267},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PPARGC1B","total_profiled":1310},"omim":[{"mim_id":"619511","title":"ZINC FINGER PROTEIN 354C; ZNF354C","url":"https://www.omim.org/entry/619511"},{"mim_id":"615921","title":"PPARGC1- AND ESRR-INDUCED REGULATOR, MUSCLE, 1; PERM1","url":"https://www.omim.org/entry/615921"},{"mim_id":"609059","title":"PATATIN-LIKE PHOSPHOLIPASE DOMAIN-CONTAINING PROTEIN 2; PNPLA2","url":"https://www.omim.org/entry/609059"},{"mim_id":"608886","title":"PEROXISOME PROLIFERATOR-ACTIVATED RECEPTOR-GAMMA, COACTIVATOR 1, BETA; PPARGC1B","url":"https://www.omim.org/entry/608886"},{"mim_id":"604517","title":"PEROXISOME PROLIFERATOR-ACTIVATED RECEPTOR-GAMMA, COACTIVATOR 1, ALPHA; PPARGC1A","url":"https://www.omim.org/entry/604517"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"retina","ntpm":11.2}],"url":"https://www.proteinatlas.org/search/PPARGC1B"},"hgnc":{"alias_symbol":["PERC","PGC1B","PPARAGCIβ"],"prev_symbol":[]},"alphafold":{"accession":"Q86YN6","domains":[{"cath_id":"3.30.70.330","chopping":"892-981","consensus_level":"medium","plddt":86.4559,"start":892,"end":981}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86YN6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86YN6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86YN6-F1-predicted_aligned_error_v6.png","plddt_mean":50.09},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PPARGC1B","jax_strain_url":"https://www.jax.org/strain/search?query=PPARGC1B"},"sequence":{"accession":"Q86YN6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86YN6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86YN6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86YN6"}},"corpus_meta":[{"pmid":"11854298","id":"PMC_11854298","title":"The 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American volume","url":"https://pubmed.ncbi.nlm.nih.gov/32701715","citation_count":5,"is_preprint":false},{"pmid":"35514385","id":"PMC_35514385","title":"Omni-directional light capture in PERC solar cells enhanced by stamping hierarchical structured silicone encapsulation that mimics leaf epidermis.","date":"2020","source":"RSC advances","url":"https://pubmed.ncbi.nlm.nih.gov/35514385","citation_count":3,"is_preprint":false},{"pmid":"35497601","id":"PMC_35497601","title":"Omni-direction PERC solar cells harnessing periodic locally focused light incident through patterned PDMS encapsulation.","date":"2020","source":"RSC advances","url":"https://pubmed.ncbi.nlm.nih.gov/35497601","citation_count":3,"is_preprint":false},{"pmid":"27027322","id":"PMC_27027322","title":"Functional Characterization of Exonic Variants of the PPARGC1B Gene in Coregulation of Estrogen Receptor Alpha.","date":"2016","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/27027322","citation_count":2,"is_preprint":false},{"pmid":"38920974","id":"PMC_38920974","title":"Improvement in Facial Wrinkles Using Materials Enhancing PPARGC1B Expression Related to Mitochondrial Function.","date":"2024","source":"Current issues in molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/38920974","citation_count":2,"is_preprint":false},{"pmid":"27108113","id":"PMC_27108113","title":"PPARGC1B gene is associated with Kashin-Beck disease in Han Chinese.","date":"2016","source":"Functional & integrative genomics","url":"https://pubmed.ncbi.nlm.nih.gov/27108113","citation_count":2,"is_preprint":false},{"pmid":"29129679","id":"PMC_29129679","title":"Pecularities of the structure of glycogen as an indicator of the functional state of mauthner neurons in fish Percсottus glehni during wintering.","date":"2017","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/29129679","citation_count":2,"is_preprint":false},{"pmid":"28127578","id":"PMC_28127578","title":"Data of ALD Al2O3 rear surface passivation, Al2O3 PERC cell performance, and cell efficiency loss mechanisms of Al2O3 PERC cell.","date":"2016","source":"Data in brief","url":"https://pubmed.ncbi.nlm.nih.gov/28127578","citation_count":2,"is_preprint":false},{"pmid":"38190589","id":"PMC_38190589","title":"Human Genetic Variation at rs10071329 Correlates With Adiposity-Related Traits, Modulates PPARGC1B Expression, and Alters Brown Adipocyte Function.","date":"2024","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/38190589","citation_count":1,"is_preprint":false},{"pmid":"39071446","id":"PMC_39071446","title":"Peptide-enabled ribonucleoprotein delivery for CRISPR engineering (PERC) in primary human immune cells and hematopoietic stem cells.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39071446","citation_count":1,"is_preprint":false},{"pmid":"39992861","id":"PMC_39992861","title":"Optimization Strategies and Efficiency Prediction for Silicon Solar Cells with Hybrid Route of PERC and SHJ Passivation Contact.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/39992861","citation_count":1,"is_preprint":false},{"pmid":"39285257","id":"PMC_39285257","title":"Performance analysis of partially shaded high-efficiency mono PERC/mono crystalline PV module under indoor and environmental conditions.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39285257","citation_count":1,"is_preprint":false},{"pmid":"28773674","id":"PMC_28773674","title":"Low Cost Local Contact Opening by Using Polystyrene Spheres Spin-Coating Method for PERC Solar Cells.","date":"2016","source":"Materials (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/28773674","citation_count":1,"is_preprint":false},{"pmid":"39865939","id":"PMC_39865939","title":"PerC B-Cells Activation via Thermogenetics-Based CXCL12 Generator for Intraperitoneal Immunity Against Metastatic Disseminated Tumor Cells.","date":"2025","source":"Advanced materials (Deerfield Beach, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/39865939","citation_count":0,"is_preprint":false},{"pmid":"28127579","id":"PMC_28127579","title":"Data of the recombination loss mechanisms analysis on Al2O3 PERC cell using PC1D and PC2D simulations.","date":"2016","source":"Data in brief","url":"https://pubmed.ncbi.nlm.nih.gov/28127579","citation_count":0,"is_preprint":false},{"pmid":"40913501","id":"PMC_40913501","title":"Record Open-Circuit Voltage in Perovskite/PERC Tandem Solar Cells via Novel a-Si Interlayer Passivation.","date":"2025","source":"Small methods","url":"https://pubmed.ncbi.nlm.nih.gov/40913501","citation_count":0,"is_preprint":false},{"pmid":"40923971","id":"PMC_40923971","title":"PERC: a suite of software tools for the curation of cryoEM data with application to simulation, modeling and machine learning.","date":"2025","source":"Acta crystallographica. Section F, Structural biology communications","url":"https://pubmed.ncbi.nlm.nih.gov/40923971","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.26.690638","title":"Efficient  <i>in vivo</i>  mammalian neuron editing using peptide-mediated CRISPR enzyme delivery","date":"2025-11-29","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.26.690638","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.18.25336011","title":"Prenatal exposure to extreme temperatures and neonatal health in Lausanne 1909 to 1912","date":"2025-09-19","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.18.25336011","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22739,"output_tokens":1837,"usd":0.047886},"stage2":{"model":"claude-opus-4-6","input_tokens":5177,"output_tokens":4976,"usd":0.225428},"total_usd":0.273314,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"PPARGC1B (PERC) selectively coactivates estrogen receptor alpha (ERα) but not ERβ through a bipartite transcriptional activation domain and two LXXLL motifs that interact with the AF2 domain of ERα in an estrogen-dependent manner.\",\n      \"method\": \"Co-transfection reporter assays, LXXLL motif mutagenesis, in vitro binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (reporter assay, mutagenesis, binding assay) in a single well-controlled study with 189 citations\",\n      \"pmids\": [\"11854298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PPARGC1B (PERC) directly interacts with and potently coactivates the orphan nuclear receptor ERRγ via its AF-2 domain, as shown by in vitro interaction experiments and cell-based reporter assays.\",\n      \"method\": \"In vitro protein interaction assay, co-transfection luciferase reporter assay, receptor truncation analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction shown in vitro plus functional reporter assay, single lab\",\n      \"pmids\": [\"12470660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The PPARGC1B exon 5 variant +102525A allele enhances ERα transcriptional activity and physically interacts more strongly with ERα than the +102525G allele following 17β-estradiol treatment, as demonstrated by luciferase reporter and co-precipitation assays.\",\n      \"method\": \"Luciferase reporter assay, co-immunoprecipitation (co-precipitation assay) in 293T cells\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal methods (reporter + co-IP), single lab\",\n      \"pmids\": [\"27027322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PPARGC1B mediates 17β-estradiol (E2)-dependent enhancement of mitochondrial biogenesis and function in hepatocytes; siRNA knockdown of PPARGC1B (but not PGC1A) abolished E2-induced improvements in mitochondrial content and oxidative capacity in HepG2 cells.\",\n      \"method\": \"siRNA knockdown, mitochondrial biogenesis/function assays in HepG2 hepatocytes and ovariectomized rat model\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype, in vitro and in vivo model, single lab\",\n      \"pmids\": [\"27885055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZFP36L1 post-transcriptionally suppresses PPARGC1B by targeting adenylate-uridylate-rich elements (AREs) in the 3'-UTR of PPARGC1B mRNA; knockdown of PPARGC1B impairs adipogenic differentiation of bone marrow mesenchymal stem cells.\",\n      \"method\": \"Lentivirus-mediated ZFP36L1 knockdown and overexpression, PPARGC1B knockdown, adipogenesis assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined phenotypic readout, multiple genetic perturbations, single lab\",\n      \"pmids\": [\"29993187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The rs10071329 variant in PPARGC1B acts as a cis-eQTL; CRISPR/Cas9 allele switching from A/A to G/G in a human brown adipocyte cell line increased PPARGC1B expression, enhanced mitochondria-encoded gene expression, improved basal and norepinephrine-stimulated mitochondrial respiration, and increased norepinephrine-stimulated lipolysis.\",\n      \"method\": \"CRISPR/Cas9 scarless allele editing, RNA-seq, mitochondrial respiration assays (Seahorse), glycerol release assay\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — CRISPR allele editing with multiple orthogonal functional readouts in a single study\",\n      \"pmids\": [\"38190589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Genetic polymorphisms in PPARGC1B (including promoter variant -427C>T) modulate PPARGC1B mRNA levels and promoter activity in airway cells; EMSA demonstrated that the -427C allele exhibits stronger binding to a nuclear protein than the -427T allele, linking PPARGC1B expression level to airway hyperreactivity.\",\n      \"method\": \"Luciferase reporter assay, EMSA, real-time PCR of mRNA levels in human subjects\",\n      \"journal\": \"Clinical and experimental allergy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (EMSA, reporter assay, mRNA quantification), single lab\",\n      \"pmids\": [\"21692888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Estrogen (E2) treatment of MCF-7 cells induces PPARGC1B expression and enhances occupancies of ERα and RNA polymerase II within a PPARGC1B genomic region, suggesting a feed-forward regulatory loop between ESR1 and PPARGC1B.\",\n      \"method\": \"ChIP assay, RT-PCR in MCF-7 cells after estrogen treatment\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with functional context, single lab\",\n      \"pmids\": [\"21269472\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PPARGC1B (PGC-1β/PERC) is a transcriptional coactivator that selectively enhances ERα and ERRγ activity via LXXLL motif–AF2 domain interactions, drives mitochondrial biogenesis and function downstream of estrogen signaling (particularly in liver and brown adipose tissue), and is itself subject to post-transcriptional regulation by ZFP36L1 targeting its 3'-UTR AREs, with its expression level controlled in part by cis-acting genetic variants (e.g., rs10071329) that alter brown adipocyte mitochondrial respiration and lipolysis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PPARGC1B (PGC-1β/PERC) is a transcriptional coactivator that selectively coactivates estrogen receptor alpha (ERα) and the orphan nuclear receptor ERRγ through LXXLL motif–AF2 domain interactions, functioning in an estrogen-dependent manner [PMID:11854298, PMID:12470660]. Estrogen signaling induces PPARGC1B expression via ERα occupancy at its genomic locus, establishing a feed-forward regulatory loop, and PPARGC1B in turn drives mitochondrial biogenesis and oxidative capacity in hepatocytes downstream of 17β-estradiol [PMID:21269472, PMID:27885055]. Cis-regulatory genetic variants (e.g., rs10071329) modulate PPARGC1B expression levels and thereby control mitochondria-encoded gene expression, mitochondrial respiration, and norepinephrine-stimulated lipolysis in brown adipocytes [PMID:38190589]. PPARGC1B mRNA is post-transcriptionally suppressed by ZFP36L1 through AU-rich elements in its 3′-UTR, and its knockdown impairs adipogenic differentiation of bone marrow mesenchymal stem cells [PMID:29993187].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying PPARGC1B as a nuclear receptor coactivator resolved the question of whether a PGC-1α paralog exists that selectively engages ERα over ERβ, establishing that PPARGC1B uses two LXXLL motifs to bind the ERα AF2 domain in an estrogen-dependent manner.\",\n      \"evidence\": \"Co-transfection reporter assays, LXXLL mutagenesis, and in vitro binding assays\",\n      \"pmids\": [\"11854298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether PPARGC1B coactivates other nuclear receptors beyond ERα was not tested\",\n        \"Endogenous chromatin context was not addressed\",\n        \"No in vivo functional data provided\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extending the receptor repertoire, PPARGC1B was shown to potently coactivate the orphan receptor ERRγ via its AF-2 domain, broadening the functional scope of PGC-1β beyond estrogen receptors.\",\n      \"evidence\": \"In vitro protein interaction assay and luciferase reporter assay with receptor truncation analysis\",\n      \"pmids\": [\"12470660\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Endogenous target genes of the PPARGC1B–ERRγ axis were not identified\",\n        \"Physiological tissue context was unexplored\",\n        \"No loss-of-function validation\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"ChIP experiments revealed that estrogen induces PPARGC1B expression itself via ERα and RNA Pol II recruitment to the PPARGC1B locus, establishing a feed-forward loop in which ERα both recruits PPARGC1B as a coactivator and transcriptionally upregulates it.\",\n      \"evidence\": \"ChIP assay and RT-PCR in MCF-7 breast cancer cells treated with estrogen\",\n      \"pmids\": [\"21269472\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether this feed-forward loop operates in non-cancer, primary cells was not shown\",\n        \"The specific ERα binding site within the PPARGC1B locus was not mapped at high resolution\",\n        \"Functional consequence of disrupting the loop was not tested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Promoter variants in PPARGC1B were shown to alter transcription factor binding affinity and mRNA levels, linking PPARGC1B expression regulation to a physiological phenotype (airway hyperreactivity) for the first time.\",\n      \"evidence\": \"EMSA, luciferase reporter assays, and RT-PCR of mRNA in human subjects\",\n      \"pmids\": [\"21692888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The transcription factor binding the −427C allele was not identified\",\n        \"Mechanism linking PPARGC1B expression to airway phenotype was not dissected\",\n        \"Small subject cohort limits generalizability\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A coding variant in PPARGC1B exon 5 was shown to modulate the strength of the physical ERα–PPARGC1B interaction and downstream transcriptional output, providing the first evidence that natural human PPARGC1B variation directly tunes coactivator–receptor coupling.\",\n      \"evidence\": \"Luciferase reporter assay and co-immunoprecipitation in 293T cells after estradiol treatment\",\n      \"pmids\": [\"27027322\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Structural basis for differential ERα binding by the two alleles was not resolved\",\n        \"Downstream physiological consequences of allele-specific coactivation were not tested\",\n        \"Endogenous expression context was not examined\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"siRNA knockdown established that PPARGC1B, rather than PGC-1α, is the essential mediator of estrogen-driven mitochondrial biogenesis and oxidative capacity in hepatocytes, directly linking its coactivator role to mitochondrial function.\",\n      \"evidence\": \"siRNA knockdown of PPARGC1B in HepG2 cells with mitochondrial content and respiration assays; corroborated in ovariectomized rat model\",\n      \"pmids\": [\"27885055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The nuclear receptor partner through which PPARGC1B drives hepatic mitochondrial biogenesis was not identified\",\n        \"Rescue experiment with re-expression of PPARGC1B was not performed\",\n        \"Chronic in vivo consequences of PPARGC1B loss in liver were not examined\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of ZFP36L1 as a post-transcriptional suppressor of PPARGC1B via 3′-UTR AU-rich elements revealed a layer of mRNA stability control and linked PPARGC1B levels to adipogenic differentiation capacity.\",\n      \"evidence\": \"Lentiviral ZFP36L1 and PPARGC1B knockdown/overexpression with adipogenesis assays in bone marrow mesenchymal stem cells\",\n      \"pmids\": [\"29993187\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding of ZFP36L1 to PPARGC1B 3′-UTR AREs was not shown by CLIP or electrophoretic mobility shift\",\n        \"Whether other RNA-binding proteins also regulate PPARGC1B mRNA stability was not addressed\",\n        \"Mechanism by which PPARGC1B supports adipogenesis was not dissected\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"CRISPR allele editing of the cis-eQTL rs10071329 demonstrated that PPARGC1B expression level causally controls mitochondria-encoded gene expression, mitochondrial respiration, and norepinephrine-stimulated lipolysis in human brown adipocytes, directly linking genetic regulation of PPARGC1B dosage to thermogenic adipocyte function.\",\n      \"evidence\": \"CRISPR/Cas9 scarless allele switching in a human brown adipocyte cell line with RNA-seq, Seahorse respirometry, and glycerol release assays\",\n      \"pmids\": [\"38190589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which increased PPARGC1B protein upregulates mitochondria-encoded genes (direct coactivation vs. indirect effects) was not resolved\",\n        \"In vivo relevance of rs10071329 in human brown fat thermogenesis is unknown\",\n        \"Downstream transcription factor partner mediating these effects in brown adipocytes was not identified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The nuclear receptor partner(s) through which PPARGC1B drives mitochondrial gene programs in brown adipocytes and hepatocytes, the structural basis for receptor selectivity, and the full spectrum of tissues in which PPARGC1B versus PGC-1α are the dominant coactivator remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of PPARGC1B–receptor complex exists\",\n        \"Genome-wide binding profiles (ChIP-seq) for PPARGC1B are lacking\",\n        \"Tissue-specific knockout models have not been reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0074160\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ESR1\", \"ESRRG\", \"ZFP36L1\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to correct the pathway term. \"GO:0074160\" is not a valid Reactome term. Let me fix:\n\n```json\n{\n  \"mechanistic_narrative\": \"PPARGC1B (PGC-1β/PERC) is a transcriptional coactivator that selectively coactivates estrogen receptor alpha (ERα) and the orphan nuclear receptor ERRγ through LXXLL motif–AF2 domain interactions, functioning in an estrogen-dependent manner [PMID:11854298, PMID:12470660]. Estrogen signaling induces PPARGC1B expression via ERα occupancy at its genomic locus, establishing a feed-forward regulatory loop, and PPARGC1B in turn drives mitochondrial biogenesis and oxidative capacity in hepatocytes downstream of 17β-estradiol [PMID:21269472, PMID:27885055]. Cis-regulatory genetic variants (e.g., rs10071329) modulate PPARGC1B expression levels and thereby control mitochondria-encoded gene expression, mitochondrial respiration, and norepinephrine-stimulated lipolysis in brown adipocytes [PMID:38190589]. PPARGC1B mRNA is post-transcriptionally suppressed by ZFP36L1 through AU-rich elements in its 3′-UTR, and its knockdown impairs adipogenic differentiation of bone marrow mesenchymal stem cells [PMID:29993187].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying PPARGC1B as a nuclear receptor coactivator resolved the question of whether a PGC-1α paralog exists that selectively engages ERα over ERβ, establishing that PPARGC1B uses two LXXLL motifs to bind the ERα AF2 domain in an estrogen-dependent manner.\",\n      \"evidence\": \"Co-transfection reporter assays, LXXLL mutagenesis, and in vitro binding assays\",\n      \"pmids\": [\"11854298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether PPARGC1B coactivates other nuclear receptors beyond ERα was not tested\",\n        \"Endogenous chromatin context was not addressed\",\n        \"No in vivo functional data provided\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extending the receptor repertoire, PPARGC1B was shown to potently coactivate the orphan receptor ERRγ via its AF-2 domain, broadening the functional scope of PGC-1β beyond estrogen receptors.\",\n      \"evidence\": \"In vitro protein interaction assay and luciferase reporter assay with receptor truncation analysis\",\n      \"pmids\": [\"12470660\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Endogenous target genes of the PPARGC1B–ERRγ axis were not identified\",\n        \"Physiological tissue context was unexplored\",\n        \"No loss-of-function validation\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"ChIP experiments revealed that estrogen induces PPARGC1B expression itself via ERα and RNA Pol II recruitment to the PPARGC1B locus, establishing a feed-forward loop in which ERα both recruits PPARGC1B as a coactivator and transcriptionally upregulates it.\",\n      \"evidence\": \"ChIP assay and RT-PCR in MCF-7 breast cancer cells treated with estrogen\",\n      \"pmids\": [\"21269472\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether this feed-forward loop operates in non-cancer, primary cells was not shown\",\n        \"The specific ERα binding site within the PPARGC1B locus was not mapped at high resolution\",\n        \"Functional consequence of disrupting the loop was not tested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Promoter variants in PPARGC1B were shown to alter transcription factor binding affinity and mRNA levels, linking PPARGC1B expression regulation to a physiological phenotype (airway hyperreactivity) for the first time.\",\n      \"evidence\": \"EMSA, luciferase reporter assays, and RT-PCR of mRNA in human subjects\",\n      \"pmids\": [\"21692888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The transcription factor binding the −427C allele was not identified\",\n        \"Mechanism linking PPARGC1B expression to airway phenotype was not dissected\",\n        \"Small subject cohort limits generalizability\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A coding variant in PPARGC1B exon 5 was shown to modulate the strength of the physical ERα–PPARGC1B interaction and downstream transcriptional output, providing the first evidence that natural human PPARGC1B variation directly tunes coactivator–receptor coupling.\",\n      \"evidence\": \"Luciferase reporter assay and co-immunoprecipitation in 293T cells after estradiol treatment\",\n      \"pmids\": [\"27027322\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Structural basis for differential ERα binding by the two alleles was not resolved\",\n        \"Downstream physiological consequences of allele-specific coactivation were not tested\",\n        \"Endogenous expression context was not examined\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"siRNA knockdown established that PPARGC1B, rather than PGC-1α, is the essential mediator of estrogen-driven mitochondrial biogenesis and oxidative capacity in hepatocytes, directly linking its coactivator role to mitochondrial function.\",\n      \"evidence\": \"siRNA knockdown of PPARGC1B in HepG2 cells with mitochondrial content and respiration assays; corroborated in ovariectomized rat model\",\n      \"pmids\": [\"27885055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The nuclear receptor partner through which PPARGC1B drives hepatic mitochondrial biogenesis was not identified\",\n        \"Rescue experiment with re-expression of PPARGC1B was not performed\",\n        \"Chronic in vivo consequences of PPARGC1B loss in liver were not examined\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of ZFP36L1 as a post-transcriptional suppressor of PPARGC1B via 3′-UTR AU-rich elements revealed a layer of mRNA stability control and linked PPARGC1B levels to adipogenic differentiation capacity.\",\n      \"evidence\": \"Lentiviral ZFP36L1 and PPARGC1B knockdown/overexpression with adipogenesis assays in bone marrow mesenchymal stem cells\",\n      \"pmids\": [\"29993187\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding of ZFP36L1 to PPARGC1B 3′-UTR AREs was not shown by CLIP or electrophoretic mobility shift\",\n        \"Whether other RNA-binding proteins also regulate PPARGC1B mRNA stability was not addressed\",\n        \"Mechanism by which PPARGC1B supports adipogenesis was not dissected\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"CRISPR allele editing of the cis-eQTL rs10071329 demonstrated that PPARGC1B expression level causally controls mitochondria-encoded gene expression, mitochondrial respiration, and norepinephrine-stimulated lipolysis in human brown adipocytes, directly linking genetic regulation of PPARGC1B dosage to thermogenic adipocyte function.\",\n      \"evidence\": \"CRISPR/Cas9 scarless allele switching in a human brown adipocyte cell line with RNA-seq, Seahorse respirometry, and glycerol release assays\",\n      \"pmids\": [\"38190589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which increased PPARGC1B protein upregulates mitochondria-encoded genes (direct coactivation vs. indirect effects) was not resolved\",\n        \"In vivo relevance of rs10071329 in human brown fat thermogenesis is unknown\",\n        \"Downstream transcription factor partner mediating these effects in brown adipocytes was not identified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The nuclear receptor partner(s) through which PPARGC1B drives mitochondrial gene programs in brown adipocytes and hepatocytes, the structural basis for receptor selectivity, and the full spectrum of tissues in which PPARGC1B versus PGC-1α are the dominant coactivator remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of PPARGC1B–receptor complex exists\",\n        \"Genome-wide binding profiles (ChIP-seq) for PPARGC1B are lacking\",\n        \"Tissue-specific knockout models have not been reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ESR1\", \"ESRRG\", \"ZFP36L1\"],\n    \"other_free_text\": []\n  }\n}\n```"}