{"gene":"G6PC3","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2009,"finding":"Homozygous missense mutations in G6PC3 abolish glucose-6-phosphatase enzymatic activity, leading to increased ER stress, increased GSK-3β activity, and enhanced apoptosis in neutrophils and fibroblasts; reconstitution experiments confirmed the enzymatic defect.","method":"Functional enzymatic assay, reconstitution experiments, patient cell studies (neutrophils/fibroblasts), apoptosis assays","journal":"The New England journal of medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — enzymatic activity directly measured, reconstitution experiments performed, multiple orthogonal methods (enzymatic assay, apoptosis, ER stress markers), replicated across multiple families","pmids":["19118303"],"is_preprint":false},{"year":2019,"finding":"G6PC3 and the glucose-6-phosphate transporter G6PT/SLC37A4 collaborate to hydrolyze 1,5-anhydroglucitol-6-phosphate (1,5-AG6P), a potent inhibitor of low-KM hexokinases; G6PC3-deficient neutrophils accumulate 1,5-AG6P to ~3 mM, inhibiting hexokinase activity and causing glycolytic failure and cell death. Treating G6PC3-deficient mice with an SGLT2 inhibitor to lower blood 1,5-anhydroglucitol restored normal neutrophil counts.","method":"Enzymological assays, cell culture, metabolomics, in vivo mouse model (G6pc3-/- mice), SGLT2 inhibitor treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (enzymology, metabolomics, in vivo rescue), mechanistic substrate identified and validated in patient cells and mouse model","pmids":["30626647"],"is_preprint":false},{"year":2011,"finding":"G6PC3 deficiency causes hypoglycosylation of gp91(phox), the electron-transporting component of the NADPH oxidase, in neutrophils; mass spectrometric glycomic profiling showed severely truncated complex-type N-glycan antennae and truncated O-glycan core 2 antennae in patient neutrophils.","method":"SDS-PAGE, mass spectrometric glycomic profiling of patient neutrophils","journal":"Glycobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry-based glycomic profiling with SDS-PAGE confirmation, single lab, two orthogonal methods","pmids":["21385794"],"is_preprint":false},{"year":2010,"finding":"G6PC3 deficiency (G260R loss-of-function mutation) leads to markedly increased CXCR4 expression on neutrophils, contributing to bone marrow retention (myelokathexis) and neutropenia; the CXCR4 antagonist AMD3100 rapidly reversed neutropenia in G6pc3-/- mice, and G-CSF normalized CXCR4 expression and neutrophil counts.","method":"Flow cytometry (CXCR4 expression), G6pc3-/- mouse model, pharmacological rescue with AMD3100","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional phenotype with pharmacological rescue in mouse model and patient cells, single lab","pmids":["20616219"],"is_preprint":false},{"year":2011,"finding":"G6pc3-/- neutrophils undergoing ER stress activate PERK (protein kinase-like ER kinase) and PI3K/Akt signaling; neutrophil apoptosis is mediated in part via the intrinsic mitochondrial pathway. G-CSF in vivo therapy corrects neutropenia, normalizes p-Akt and active caspase-3 levels, increases glucose uptake, and elevates intracellular G6P, lactate, and ATP.","method":"Western blotting (signaling pathway analysis), flow cytometry (apoptosis), glucose uptake assay, metabolite measurement in G6pc3-/- mice with/without G-CSF","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical readouts in mouse model, in vivo G-CSF rescue with mechanistic endpoints, single lab","pmids":["21292774"],"is_preprint":false},{"year":2006,"finding":"UGRP/G6PC3 knockout mice show ~50% reduction in G6P hydrolytic activity in brain homogenates, confirming G6PC3 can hydrolyze G6P in vivo; female knockout mice exhibit growth retardation, elevated plasma glucagon (~60%), and reduced plasma cholesterol (~20%), but no hypoglycemia, hepatic glycogen accumulation, or hypertriglyceridemia (in contrast to G6PC1 knockout).","method":"G6PC3/UGRP knockout mouse phenotyping, enzymatic activity assay in brain homogenates, plasma metabolite measurements","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct enzymatic activity measurement in knockout tissue plus comprehensive phenotypic characterization, single lab","pmids":["17023421"],"is_preprint":false},{"year":2013,"finding":"In a G6PC3-/- mouse differentiation model, progenitor cells showed substantial apoptosis upon differentiation initiation; impaired glucose utilization was associated with ER stress, upregulation of Bim and Bax, and reduced neutrophil elastase expression/secretion. Bcl-XL overexpression rescued survival but not functional deficiencies; Bim knockdown also protected against apoptosis. Both survival and differentiation defects contribute to neutropenia.","method":"Hoxb8-conditional progenitor cell model, Bcl-XL transgenic rescue, Bim knockdown, bone marrow transplantation, MAP kinase signaling assays, cytokine secretion measurement","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via Bcl-XL and Bim manipulation, in vivo transplantation validation, multiple orthogonal methods, single lab","pmids":["23686134"],"is_preprint":false},{"year":2020,"finding":"G6PC3-deficient human neutrophils exhibit dramatic impairments in early glycolysis (reduced hexose phosphate levels), hexose monophosphate shunt (required for NADPH generation), and total adenylate pool, as measured by stable isotope tracing; these metabolic defects are associated with defective CD11b expression, F-actin assembly, migration, bacterial killing, and superoxide generation (<25% of control).","method":"Metabolomics with stable isotope-labeled tracers (U-13C-glucose, 13C,15N-glutamine, U-13C-fructose), functional neutrophil assays (migration, bactericidal activity, respiratory burst, CD11b/F-actin)","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comprehensive metabolomics with isotope tracing plus multiple functional assays, single patient/lab","pmids":["33259599"],"is_preprint":false},{"year":2022,"finding":"Treatment of G6PC3-deficient children with the SGLT2 inhibitor empagliflozin decreased blood 1,5-anhydroglucitol and neutrophil 1,5-AG6P levels and improved/normalized neutrophil counts, directly validating the 1,5-AG6P accumulation mechanism in human patients.","method":"Clinical treatment study with metabolite measurement (blood 1,5-AG and neutrophil 1,5-AG6P), neutrophil counts before and after empagliflozin","journal":"Journal of inherited metabolic disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct metabolite measurement in patient cells confirming mechanism, two patients, single lab","pmids":["35506446"],"is_preprint":false},{"year":2011,"finding":"G6PC3 promoter activity is regulated by glucose concentration (responsive between 1–5.5 mM), pyruvate, and AMP kinase (AICAR reduces activity); two adjacent E-boxes (-274 to -279 and -299 to -304) function as a glucose response element. The G6PC3 promoter is unresponsive to glucostatic hormones, unlike the hepatic G6PC isoform.","method":"Transient transfection with G6PC3 promoter-luciferase reporter, dual luciferase assay, deletion mutagenesis, pharmacological inhibitors","journal":"Molecular genetics and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with deletion mutagenesis and multiple pharmacological perturbations, single lab","pmids":["21474354"],"is_preprint":false},{"year":2017,"finding":"G6PC3-deficient monocytes have reduced glycolytic reserve; upon LPS stimulation, they show significantly increased NLRP3 inflammasome-dependent production of IL-1β and IL-18, and enhanced IL-6 and TNF production, linking G6PC3-dependent glycolysis to inflammasome regulation.","method":"Extracellular flux assay (glycolytic reserve), cytokine measurement (ELISA), NLRP3 inflammasome inhibition assay, whole blood assay","journal":"Frontiers in immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — patient cells from two individuals, single lab, limited replication","pmids":["29163546"],"is_preprint":false},{"year":2020,"finding":"G6PC3-deficient neutrophils display higher activation markers (CD11b, CD66b, CD14), excessive IL-8 and reactive oxygen species production, increased apoptosis and secondary necrosis; secondary necrosis after E. coli stimulation was partially rescued with supplemental exogenous glucose, implicating glucose deficit in inflammatory dysregulation.","method":"Flow cytometry, cytokine measurement, ROS assay, glucose supplementation rescue experiment in patient neutrophils","journal":"Journal of leukocyte biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — patient cells, single lab, partial rescue experiment without full mechanistic elucidation","pmids":["32930428"],"is_preprint":false},{"year":2025,"finding":"G6PC3-deficient cells exhibit increased γH2AX foci and micronuclei formation, and defects in homologous recombination (HR) repair including impaired BRCA1 recruitment to DNA double-strand breaks; RNA-seq showed G6PC3 promotes expression of multiple HR repair genes including BRCA1. G6pc3 deficiency accelerates mammary tumor formation in Trp53-null mice.","method":"RNAi screen, γH2AX immunofluorescence, micronuclei assay, HR repair assay, BRCA1 recruitment to DSBs, RNA-seq, CRISPR-Select functional analysis, mouse mammary tumor model","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (HR assay, BRCA1 recruitment, RNA-seq, in vivo mouse model), single lab, novel function","pmids":["40261702"],"is_preprint":false},{"year":2024,"finding":"G6PC3 is predominantly expressed in pachytene spermatocytes and concentrated in the XY body; CRISPR-Cas9 knockout of G6pc3 in mice causes complete meiotic arrest at the pachytene stage, complete sterility, abnormal XY body formation, and impaired meiotic sex chromosome inactivation (MSCI).","method":"CRISPR-Cas9 knockout mouse, immunofluorescence localization, meiotic staging, XY body analysis, MSCI assessment","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with specific cellular phenotype and localization data, single lab, single study","pmids":["39420835"],"is_preprint":false},{"year":2024,"finding":"The G6PC3 c.210delC frameshift mutation leads to complete loss of G6PC3 protein expression; patient-derived cells treated with 1,5-anhydroglucitol (1,5-AG) exhibit markedly reduced engagement of glycolysis as measured by extracellular flux assay, confirming that 1,5-AG6P accumulation inhibits glycolysis in G6PC3-deficient cells.","method":"Protein expression analysis, extracellular flux assay (glycolysis measurement), treatment with 1,5-AG in patient-derived EBV-B cells","journal":"Journal of clinical immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single mutation/patient cohort, single lab, confirmatory rather than novel mechanistic finding","pmids":["39630167"],"is_preprint":false}],"current_model":"G6PC3 is an endoplasmic reticulum-resident glucose-6-phosphatase that, together with the G6P transporter G6PT/SLC37A4, hydrolyzes 1,5-anhydroglucitol-6-phosphate (1,5-AG6P) — a toxic inhibitor of hexokinases formed from the dietary compound 1,5-anhydroglucitol — thereby preventing glycolytic failure and apoptosis in neutrophils and other cells; loss-of-function mutations abolish this metabolite-repair function, causing ER stress, increased CXCR4 expression, impaired NADPH oxidase glycosylation, and neutropenia, while additionally G6PC3 promotes homologous recombination DNA repair by supporting BRCA1 recruitment to double-strand breaks and is required for meiotic sex chromosome inactivation during spermatogenesis."},"narrative":{"mechanistic_narrative":"G6PC3 is an endoplasmic reticulum glucose-6-phosphatase that performs a metabolite-repair function essential for neutrophil and cellular viability [PMID:19118303, PMID:30626647]. Acting together with the G6P transporter G6PT/SLC37A4, it hydrolyzes 1,5-anhydroglucitol-6-phosphate (1,5-AG6P), a toxic inhibitor of low-KM hexokinases; loss of G6PC3 lets 1,5-AG6P accumulate to millimolar levels, blocking glycolysis and causing glycolytic failure and cell death, a mechanism validated in patient cells and reversed in mice and patients by lowering circulating 1,5-anhydroglucitol with SGLT2 inhibitors [PMID:30626647, PMID:35506446]. Loss-of-function mutations abolish enzymatic activity and produce severe congenital neutropenia, with downstream ER stress, PERK activation, intrinsic mitochondrial apoptosis, and elevated GSK-3β activity in neutrophils and fibroblasts [PMID:19118303, PMID:21292774, PMID:23686134]. The metabolic deficit impairs early glycolysis and the hexose monophosphate shunt, compromising NADPH generation, superoxide production, migration, and bacterial killing, and is accompanied by hypoglycosylation of the NADPH oxidase component gp91(phox) and elevated neutrophil CXCR4 driving bone marrow retention [PMID:21385794, PMID:20616219, PMID:33259599]. Beyond myeloid metabolism, G6PC3 supports homologous-recombination DNA repair by promoting BRCA1 expression and recruitment to double-strand breaks [PMID:40261702], and is required in pachytene spermatocytes for XY body formation and meiotic sex chromosome inactivation [PMID:39420835].","teleology":[{"year":2006,"claim":"Established that G6PC3 is a bona fide glucose-6-phosphate hydrolase in vivo and distinguished its physiology from the hepatic G6PC isoform, framing it as a non-gluconeogenic phosphatase.","evidence":"G6PC3/UGRP knockout mouse phenotyping with enzymatic assay in brain homogenates and plasma metabolite profiling","pmids":["17023421"],"confidence":"Medium","gaps":["The physiological substrate beyond generic G6P was not identified","No mechanistic link to neutrophil biology established at this stage"]},{"year":2009,"claim":"Answered why G6PC3 mutations cause disease by showing they abolish phosphatase activity and trigger ER stress and apoptosis in neutrophils and fibroblasts, defining a loss-of-function mechanism for congenital neutropenia.","evidence":"Enzymatic assays with reconstitution and patient cell apoptosis/ER stress studies across multiple families","pmids":["19118303"],"confidence":"High","gaps":["The metabolite whose accumulation drives toxicity was unknown","Connection between enzymatic loss and ER stress was correlative"]},{"year":2010,"claim":"Linked G6PC3 deficiency to neutrophil trafficking by showing elevated CXCR4 drives bone marrow retention, explaining the myelokathexis component of neutropenia.","evidence":"Flow cytometry of CXCR4 and pharmacological rescue with AMD3100 in G6pc3-/- mice","pmids":["20616219"],"confidence":"Medium","gaps":["Mechanism connecting metabolic defect to CXCR4 upregulation not resolved","Single-lab mouse and patient data"]},{"year":2011,"claim":"Characterized the apoptotic and signaling pathways downstream of metabolic failure (PERK, PI3K/Akt, intrinsic mitochondrial apoptosis) and showed N-/O-glycan defects on the NADPH oxidase subunit gp91(phox), and defined glucose-responsive transcriptional control of the G6PC3 promoter.","evidence":"Western blotting and apoptosis assays in G6pc3-/- mice; mass spectrometric glycomics of patient neutrophils; promoter-luciferase reporter with deletion mutagenesis","pmids":["21292774","21385794","21474354"],"confidence":"Medium","gaps":["Causal chain from glycolytic deficit to hypoglycosylation not directly demonstrated","Promoter regulation studied in cell lines without in vivo confirmation"]},{"year":2013,"claim":"Resolved whether neutropenia is a survival or differentiation defect by genetic epistasis, showing both contribute and implicating Bim/Bax-dependent apoptosis at differentiation onset.","evidence":"Hoxb8 progenitor model with Bcl-XL transgenic rescue, Bim knockdown, and bone marrow transplantation","pmids":["23686134"],"confidence":"Medium","gaps":["Bcl-XL rescued survival but not functional defects, leaving the functional deficit mechanism open","Single-lab model system"]},{"year":2019,"claim":"Identified the toxic substrate by showing G6PC3 and G6PT hydrolyze 1,5-AG6P, whose accumulation inhibits hexokinases and causes glycolytic failure, and demonstrated in vivo rescue by lowering blood 1,5-anhydroglucitol.","evidence":"Enzymology, metabolomics, and SGLT2 inhibitor treatment of G6pc3-/- mice","pmids":["30626647"],"confidence":"High","gaps":["Did not establish whether 1,5-AG6P repair explains the DNA repair or meiotic roles","Human therapeutic validation not yet performed at this stage"]},{"year":2020,"claim":"Quantified the downstream metabolic and functional consequences, tracing impaired glycolysis and hexose monophosphate shunt flux to defective NADPH-dependent respiratory burst, migration, and bacterial killing.","evidence":"Stable isotope tracing metabolomics with neutrophil functional assays; flow cytometry and glucose supplementation rescue","pmids":["33259599","32930428"],"confidence":"Medium","gaps":["Patient-cell studies from limited donors","Glucose rescue was only partial"]},{"year":2022,"claim":"Translated the 1,5-AG6P mechanism to humans by showing empagliflozin lowers neutrophil 1,5-AG6P and normalizes counts, confirming the metabolite-repair model clinically.","evidence":"Clinical SGLT2 inhibitor treatment with metabolite measurement and neutrophil counts in patients","pmids":["35506446"],"confidence":"Medium","gaps":["Only two patients","Long-term efficacy and effects on non-myeloid functions not assessed"]},{"year":2024,"claim":"Extended G6PC3 function beyond metabolism by demonstrating an essential meiotic role in XY body formation and meiotic sex chromosome inactivation in spermatocytes.","evidence":"CRISPR-Cas9 knockout mouse with immunofluorescence localization, meiotic staging, and MSCI assessment","pmids":["39420835"],"confidence":"Medium","gaps":["Molecular mechanism linking phosphatase activity to MSCI unknown","Whether a metabolic substrate underlies the meiotic role is unresolved"]},{"year":2025,"claim":"Revealed a genome-stability role by showing G6PC3 promotes HR-repair gene expression and BRCA1 recruitment to double-strand breaks, with deficiency accelerating tumorigenesis.","evidence":"RNAi screen, gammaH2AX/micronuclei assays, HR repair and BRCA1 recruitment assays, RNA-seq, and Trp53-null mouse mammary tumor model","pmids":["40261702"],"confidence":"Medium","gaps":["Whether DNA-repair role is a direct enzymatic function or a downstream metabolic consequence is unresolved","Single-lab finding"]},{"year":null,"claim":"How a single ER glucose-6-phosphatase mechanistically connects its metabolite-repair activity to homologous recombination and meiotic sex chromosome inactivation remains unknown.","evidence":"No direct evidence in the available corpus links the 1,5-AG6P hydrolysis activity to the DNA-repair or meiotic phenotypes","pmids":[],"confidence":"Low","gaps":["No demonstrated substrate or metabolite mediating the DNA repair role","No mechanism connecting phosphatase activity to BRCA1 expression or MSCI"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,5]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,5,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12]}],"complexes":[],"partners":["SLC37A4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BUM1","full_name":"Glucose-6-phosphatase 3","aliases":["Glucose-6-phosphatase beta","G6Pase-beta","Ubiquitous glucose-6-phosphatase catalytic subunit-related protein"],"length_aa":346,"mass_kda":38.7,"function":"Hydrolyzes glucose-6-phosphate to glucose in the endoplasmic reticulum. May form with the glucose-6-phosphate transporter (SLC37A4/G6PT) a ubiquitously expressed complex responsible for glucose production through glycogenolysis and gluconeogenesis. Probably required for normal neutrophil function","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q9BUM1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/G6PC3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/G6PC3","total_profiled":1310},"omim":[{"mim_id":"619136","title":"SOLUTE CARRIER FAMILY 37 (GLUCOSE-6-PHOSPHATE TRANSPORTER), MEMBER A2; SLC37A2","url":"https://www.omim.org/entry/619136"},{"mim_id":"612541","title":"NEUTROPENIA, SEVERE CONGENITAL, 4, AUTOSOMAL RECESSIVE; SCN4","url":"https://www.omim.org/entry/612541"},{"mim_id":"611045","title":"GLUCOSE-6-PHOSPHATASE, CATALYTIC SUBUNIT 3; G6PC3","url":"https://www.omim.org/entry/611045"},{"mim_id":"603187","title":"CENTRIN 1; CETN1","url":"https://www.omim.org/entry/603187"},{"mim_id":"602671","title":"SOLUTE CARRIER FAMILY 37 (GLUCOSE-6-PHOSPHATE TRANSPORTER), MEMBER 4; SLC37A4","url":"https://www.omim.org/entry/602671"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/G6PC3"},"hgnc":{"alias_symbol":["UGRP"],"prev_symbol":[]},"alphafold":{"accession":"Q9BUM1","domains":[{"cath_id":"-","chopping":"2-338","consensus_level":"medium","plddt":94.2802,"start":2,"end":338}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BUM1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BUM1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BUM1-F1-predicted_aligned_error_v6.png","plddt_mean":92.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=G6PC3","jax_strain_url":"https://www.jax.org/strain/search?query=G6PC3"},"sequence":{"accession":"Q9BUM1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BUM1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BUM1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BUM1"}},"corpus_meta":[{"pmid":"19118303","id":"PMC_19118303","title":"A syndrome with congenital neutropenia and mutations in G6PC3.","date":"2009","source":"The New England journal of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19118303","citation_count":265,"is_preprint":false},{"pmid":"30626647","id":"PMC_30626647","title":"Failure to eliminate a phosphorylated glucose analog leads to neutropenia in patients with G6PT and G6PC3 deficiency.","date":"2019","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/30626647","citation_count":136,"is_preprint":false},{"pmid":"19775295","id":"PMC_19775295","title":"Prevalence of mutations in ELANE, GFI1, HAX1, SBDS, WAS and G6PC3 in patients with severe congenital neutropenia.","date":"2009","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/19775295","citation_count":131,"is_preprint":false},{"pmid":"21385794","id":"PMC_21385794","title":"G6PC3 mutations are associated with a major defect of glycosylation: a novel mechanism for neutrophil dysfunction.","date":"2011","source":"Glycobiology","url":"https://pubmed.ncbi.nlm.nih.gov/21385794","citation_count":75,"is_preprint":false},{"pmid":"20616219","id":"PMC_20616219","title":"Severe congenital neutropenia resulting from G6PC3 deficiency with increased neutrophil CXCR4 expression and myelokathexis.","date":"2010","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/20616219","citation_count":69,"is_preprint":false},{"pmid":"23758768","id":"PMC_23758768","title":"A clinical and molecular review of ubiquitous glucose-6-phosphatase deficiency caused by G6PC3 mutations.","date":"2013","source":"Orphanet journal of rare diseases","url":"https://pubmed.ncbi.nlm.nih.gov/23758768","citation_count":66,"is_preprint":false},{"pmid":"21677667","id":"PMC_21677667","title":"Homozygosity mapping and whole-exome sequencing to detect SLC45A2 and G6PC3 mutations in a single patient with oculocutaneous albinism and neutropenia.","date":"2011","source":"The Journal of investigative 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disease","url":"https://pubmed.ncbi.nlm.nih.gov/35506446","citation_count":34,"is_preprint":false},{"pmid":"15626484","id":"PMC_15626484","title":"Interleukin-5 reduces the expression of uteroglobin-related protein (UGRP) 1 gene in allergic airway inflammation.","date":"2005","source":"Immunology letters","url":"https://pubmed.ncbi.nlm.nih.gov/15626484","citation_count":33,"is_preprint":false},{"pmid":"37238286","id":"PMC_37238286","title":"Treatment of the Neutropenia Associated with GSD1b and G6PC3 Deficiency with SGLT2 Inhibitors.","date":"2023","source":"Diagnostics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/37238286","citation_count":32,"is_preprint":false},{"pmid":"27793029","id":"PMC_27793029","title":"G6PC3, ALDOA and CS induction accompanies mir-122 down-regulation in the mechanical asphyxia and can serve as hypoxia 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Population.","date":"2022","source":"Revista de investigacion clinica; organo del Hospital de Enfermedades de la Nutricion","url":"https://pubmed.ncbi.nlm.nih.gov/36546889","citation_count":6,"is_preprint":false},{"pmid":"34137364","id":"PMC_34137364","title":"Novel G6PC3 Mutations in Patients with Congenital Neutropenia: Case Reports and Review of the Literature.","date":"2021","source":"Endocrine, metabolic & immune disorders drug targets","url":"https://pubmed.ncbi.nlm.nih.gov/34137364","citation_count":5,"is_preprint":false},{"pmid":"24750412","id":"PMC_24750412","title":"A novel G6PC3 gene mutation in severe congenital neutropenia: pancytopenia and variable bone marrow phenotype can also be part of this syndrome.","date":"2014","source":"European journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/24750412","citation_count":5,"is_preprint":false},{"pmid":"37296469","id":"PMC_37296469","title":"Severe congenital neutropenia due to G6PC3 deficiency: early and delayed 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negatively regulates G6PC3 in HepG2 cells, as identified by label‑free mass‑spectrometry.","date":"2017","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/28713988","citation_count":4,"is_preprint":false},{"pmid":"23441086","id":"PMC_23441086","title":"A novel phenotype variant of severe congenital neutropenia caused by G6PC3 deficiency.","date":"2013","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/23441086","citation_count":4,"is_preprint":false},{"pmid":"24796372","id":"PMC_24796372","title":"Testicular failure in a patient with G6PC3 deficiency.","date":"2014","source":"Pediatric research","url":"https://pubmed.ncbi.nlm.nih.gov/24796372","citation_count":3,"is_preprint":false},{"pmid":"26808373","id":"PMC_26808373","title":"A Severe Congenital Neutropenia Type 4 Case (G6PC3 Mutation) Presented With Large Platelets in the Peripheral Smear.","date":"2016","source":"Journal of pediatric 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38798393","citation_count":1,"is_preprint":false},{"pmid":"40261702","id":"PMC_40261702","title":"G6PC3 promotes genome maintenance and is a candidate mammary tumor suppressor.","date":"2025","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/40261702","citation_count":0,"is_preprint":false},{"pmid":"39041036","id":"PMC_39041036","title":"Molecular and clinical characterization of a founder mutation causing G6PC3 deficiency.","date":"2024","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/39041036","citation_count":0,"is_preprint":false},{"pmid":"39420835","id":"PMC_39420835","title":"G6PC3 is involved in spermatogenesis by maintaining meiotic sex chromosome inactivation.","date":"2024","source":"Acta biochimica et biophysica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/39420835","citation_count":0,"is_preprint":false},{"pmid":"37357000","id":"PMC_37357000","title":"[Correction of the pathogenic mutation in the G6PC3 gene by adenine base editing in mutant embryos].","date":"2023","source":"Zhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/37357000","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":28039,"output_tokens":3926,"usd":0.071503,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11829,"output_tokens":3534,"usd":0.073747,"stage2_stop_reason":"end_turn"},"total_usd":0.14525,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"Homozygous missense mutations in G6PC3 abolish glucose-6-phosphatase enzymatic activity, leading to increased ER stress, increased GSK-3β activity, and enhanced apoptosis in neutrophils and fibroblasts; reconstitution experiments confirmed the enzymatic defect.\",\n      \"method\": \"Functional enzymatic assay, reconstitution experiments, patient cell studies (neutrophils/fibroblasts), apoptosis assays\",\n      \"journal\": \"The New England journal of medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — enzymatic activity directly measured, reconstitution experiments performed, multiple orthogonal methods (enzymatic assay, apoptosis, ER stress markers), replicated across multiple families\",\n      \"pmids\": [\"19118303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"G6PC3 and the glucose-6-phosphate transporter G6PT/SLC37A4 collaborate to hydrolyze 1,5-anhydroglucitol-6-phosphate (1,5-AG6P), a potent inhibitor of low-KM hexokinases; G6PC3-deficient neutrophils accumulate 1,5-AG6P to ~3 mM, inhibiting hexokinase activity and causing glycolytic failure and cell death. Treating G6PC3-deficient mice with an SGLT2 inhibitor to lower blood 1,5-anhydroglucitol restored normal neutrophil counts.\",\n      \"method\": \"Enzymological assays, cell culture, metabolomics, in vivo mouse model (G6pc3-/- mice), SGLT2 inhibitor treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (enzymology, metabolomics, in vivo rescue), mechanistic substrate identified and validated in patient cells and mouse model\",\n      \"pmids\": [\"30626647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"G6PC3 deficiency causes hypoglycosylation of gp91(phox), the electron-transporting component of the NADPH oxidase, in neutrophils; mass spectrometric glycomic profiling showed severely truncated complex-type N-glycan antennae and truncated O-glycan core 2 antennae in patient neutrophils.\",\n      \"method\": \"SDS-PAGE, mass spectrometric glycomic profiling of patient neutrophils\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry-based glycomic profiling with SDS-PAGE confirmation, single lab, two orthogonal methods\",\n      \"pmids\": [\"21385794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"G6PC3 deficiency (G260R loss-of-function mutation) leads to markedly increased CXCR4 expression on neutrophils, contributing to bone marrow retention (myelokathexis) and neutropenia; the CXCR4 antagonist AMD3100 rapidly reversed neutropenia in G6pc3-/- mice, and G-CSF normalized CXCR4 expression and neutrophil counts.\",\n      \"method\": \"Flow cytometry (CXCR4 expression), G6pc3-/- mouse model, pharmacological rescue with AMD3100\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional phenotype with pharmacological rescue in mouse model and patient cells, single lab\",\n      \"pmids\": [\"20616219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"G6pc3-/- neutrophils undergoing ER stress activate PERK (protein kinase-like ER kinase) and PI3K/Akt signaling; neutrophil apoptosis is mediated in part via the intrinsic mitochondrial pathway. G-CSF in vivo therapy corrects neutropenia, normalizes p-Akt and active caspase-3 levels, increases glucose uptake, and elevates intracellular G6P, lactate, and ATP.\",\n      \"method\": \"Western blotting (signaling pathway analysis), flow cytometry (apoptosis), glucose uptake assay, metabolite measurement in G6pc3-/- mice with/without G-CSF\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical readouts in mouse model, in vivo G-CSF rescue with mechanistic endpoints, single lab\",\n      \"pmids\": [\"21292774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"UGRP/G6PC3 knockout mice show ~50% reduction in G6P hydrolytic activity in brain homogenates, confirming G6PC3 can hydrolyze G6P in vivo; female knockout mice exhibit growth retardation, elevated plasma glucagon (~60%), and reduced plasma cholesterol (~20%), but no hypoglycemia, hepatic glycogen accumulation, or hypertriglyceridemia (in contrast to G6PC1 knockout).\",\n      \"method\": \"G6PC3/UGRP knockout mouse phenotyping, enzymatic activity assay in brain homogenates, plasma metabolite measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct enzymatic activity measurement in knockout tissue plus comprehensive phenotypic characterization, single lab\",\n      \"pmids\": [\"17023421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In a G6PC3-/- mouse differentiation model, progenitor cells showed substantial apoptosis upon differentiation initiation; impaired glucose utilization was associated with ER stress, upregulation of Bim and Bax, and reduced neutrophil elastase expression/secretion. Bcl-XL overexpression rescued survival but not functional deficiencies; Bim knockdown also protected against apoptosis. Both survival and differentiation defects contribute to neutropenia.\",\n      \"method\": \"Hoxb8-conditional progenitor cell model, Bcl-XL transgenic rescue, Bim knockdown, bone marrow transplantation, MAP kinase signaling assays, cytokine secretion measurement\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via Bcl-XL and Bim manipulation, in vivo transplantation validation, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"23686134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G6PC3-deficient human neutrophils exhibit dramatic impairments in early glycolysis (reduced hexose phosphate levels), hexose monophosphate shunt (required for NADPH generation), and total adenylate pool, as measured by stable isotope tracing; these metabolic defects are associated with defective CD11b expression, F-actin assembly, migration, bacterial killing, and superoxide generation (<25% of control).\",\n      \"method\": \"Metabolomics with stable isotope-labeled tracers (U-13C-glucose, 13C,15N-glutamine, U-13C-fructose), functional neutrophil assays (migration, bactericidal activity, respiratory burst, CD11b/F-actin)\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comprehensive metabolomics with isotope tracing plus multiple functional assays, single patient/lab\",\n      \"pmids\": [\"33259599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Treatment of G6PC3-deficient children with the SGLT2 inhibitor empagliflozin decreased blood 1,5-anhydroglucitol and neutrophil 1,5-AG6P levels and improved/normalized neutrophil counts, directly validating the 1,5-AG6P accumulation mechanism in human patients.\",\n      \"method\": \"Clinical treatment study with metabolite measurement (blood 1,5-AG and neutrophil 1,5-AG6P), neutrophil counts before and after empagliflozin\",\n      \"journal\": \"Journal of inherited metabolic disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct metabolite measurement in patient cells confirming mechanism, two patients, single lab\",\n      \"pmids\": [\"35506446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"G6PC3 promoter activity is regulated by glucose concentration (responsive between 1–5.5 mM), pyruvate, and AMP kinase (AICAR reduces activity); two adjacent E-boxes (-274 to -279 and -299 to -304) function as a glucose response element. The G6PC3 promoter is unresponsive to glucostatic hormones, unlike the hepatic G6PC isoform.\",\n      \"method\": \"Transient transfection with G6PC3 promoter-luciferase reporter, dual luciferase assay, deletion mutagenesis, pharmacological inhibitors\",\n      \"journal\": \"Molecular genetics and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with deletion mutagenesis and multiple pharmacological perturbations, single lab\",\n      \"pmids\": [\"21474354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"G6PC3-deficient monocytes have reduced glycolytic reserve; upon LPS stimulation, they show significantly increased NLRP3 inflammasome-dependent production of IL-1β and IL-18, and enhanced IL-6 and TNF production, linking G6PC3-dependent glycolysis to inflammasome regulation.\",\n      \"method\": \"Extracellular flux assay (glycolytic reserve), cytokine measurement (ELISA), NLRP3 inflammasome inhibition assay, whole blood assay\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — patient cells from two individuals, single lab, limited replication\",\n      \"pmids\": [\"29163546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G6PC3-deficient neutrophils display higher activation markers (CD11b, CD66b, CD14), excessive IL-8 and reactive oxygen species production, increased apoptosis and secondary necrosis; secondary necrosis after E. coli stimulation was partially rescued with supplemental exogenous glucose, implicating glucose deficit in inflammatory dysregulation.\",\n      \"method\": \"Flow cytometry, cytokine measurement, ROS assay, glucose supplementation rescue experiment in patient neutrophils\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — patient cells, single lab, partial rescue experiment without full mechanistic elucidation\",\n      \"pmids\": [\"32930428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"G6PC3-deficient cells exhibit increased γH2AX foci and micronuclei formation, and defects in homologous recombination (HR) repair including impaired BRCA1 recruitment to DNA double-strand breaks; RNA-seq showed G6PC3 promotes expression of multiple HR repair genes including BRCA1. G6pc3 deficiency accelerates mammary tumor formation in Trp53-null mice.\",\n      \"method\": \"RNAi screen, γH2AX immunofluorescence, micronuclei assay, HR repair assay, BRCA1 recruitment to DSBs, RNA-seq, CRISPR-Select functional analysis, mouse mammary tumor model\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (HR assay, BRCA1 recruitment, RNA-seq, in vivo mouse model), single lab, novel function\",\n      \"pmids\": [\"40261702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"G6PC3 is predominantly expressed in pachytene spermatocytes and concentrated in the XY body; CRISPR-Cas9 knockout of G6pc3 in mice causes complete meiotic arrest at the pachytene stage, complete sterility, abnormal XY body formation, and impaired meiotic sex chromosome inactivation (MSCI).\",\n      \"method\": \"CRISPR-Cas9 knockout mouse, immunofluorescence localization, meiotic staging, XY body analysis, MSCI assessment\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with specific cellular phenotype and localization data, single lab, single study\",\n      \"pmids\": [\"39420835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The G6PC3 c.210delC frameshift mutation leads to complete loss of G6PC3 protein expression; patient-derived cells treated with 1,5-anhydroglucitol (1,5-AG) exhibit markedly reduced engagement of glycolysis as measured by extracellular flux assay, confirming that 1,5-AG6P accumulation inhibits glycolysis in G6PC3-deficient cells.\",\n      \"method\": \"Protein expression analysis, extracellular flux assay (glycolysis measurement), treatment with 1,5-AG in patient-derived EBV-B cells\",\n      \"journal\": \"Journal of clinical immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single mutation/patient cohort, single lab, confirmatory rather than novel mechanistic finding\",\n      \"pmids\": [\"39630167\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"G6PC3 is an endoplasmic reticulum-resident glucose-6-phosphatase that, together with the G6P transporter G6PT/SLC37A4, hydrolyzes 1,5-anhydroglucitol-6-phosphate (1,5-AG6P) — a toxic inhibitor of hexokinases formed from the dietary compound 1,5-anhydroglucitol — thereby preventing glycolytic failure and apoptosis in neutrophils and other cells; loss-of-function mutations abolish this metabolite-repair function, causing ER stress, increased CXCR4 expression, impaired NADPH oxidase glycosylation, and neutropenia, while additionally G6PC3 promotes homologous recombination DNA repair by supporting BRCA1 recruitment to double-strand breaks and is required for meiotic sex chromosome inactivation during spermatogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"G6PC3 is an endoplasmic reticulum glucose-6-phosphatase that performs a metabolite-repair function essential for neutrophil and cellular viability [#0, #1]. Acting together with the G6P transporter G6PT/SLC37A4, it hydrolyzes 1,5-anhydroglucitol-6-phosphate (1,5-AG6P), a toxic inhibitor of low-KM hexokinases; loss of G6PC3 lets 1,5-AG6P accumulate to millimolar levels, blocking glycolysis and causing glycolytic failure and cell death, a mechanism validated in patient cells and reversed in mice and patients by lowering circulating 1,5-anhydroglucitol with SGLT2 inhibitors [#1, #8]. Loss-of-function mutations abolish enzymatic activity and produce severe congenital neutropenia, with downstream ER stress, PERK activation, intrinsic mitochondrial apoptosis, and elevated GSK-3\\u03b2 activity in neutrophils and fibroblasts [#0, #4, #6]. The metabolic deficit impairs early glycolysis and the hexose monophosphate shunt, compromising NADPH generation, superoxide production, migration, and bacterial killing, and is accompanied by hypoglycosylation of the NADPH oxidase component gp91(phox) and elevated neutrophil CXCR4 driving bone marrow retention [#2, #3, #7]. Beyond myeloid metabolism, G6PC3 supports homologous-recombination DNA repair by promoting BRCA1 expression and recruitment to double-strand breaks [#12], and is required in pachytene spermatocytes for XY body formation and meiotic sex chromosome inactivation [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that G6PC3 is a bona fide glucose-6-phosphate hydrolase in vivo and distinguished its physiology from the hepatic G6PC isoform, framing it as a non-gluconeogenic phosphatase.\",\n      \"evidence\": \"G6PC3/UGRP knockout mouse phenotyping with enzymatic assay in brain homogenates and plasma metabolite profiling\",\n      \"pmids\": [\"17023421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The physiological substrate beyond generic G6P was not identified\", \"No mechanistic link to neutrophil biology established at this stage\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Answered why G6PC3 mutations cause disease by showing they abolish phosphatase activity and trigger ER stress and apoptosis in neutrophils and fibroblasts, defining a loss-of-function mechanism for congenital neutropenia.\",\n      \"evidence\": \"Enzymatic assays with reconstitution and patient cell apoptosis/ER stress studies across multiple families\",\n      \"pmids\": [\"19118303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The metabolite whose accumulation drives toxicity was unknown\", \"Connection between enzymatic loss and ER stress was correlative\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked G6PC3 deficiency to neutrophil trafficking by showing elevated CXCR4 drives bone marrow retention, explaining the myelokathexis component of neutropenia.\",\n      \"evidence\": \"Flow cytometry of CXCR4 and pharmacological rescue with AMD3100 in G6pc3-/- mice\",\n      \"pmids\": [\"20616219\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting metabolic defect to CXCR4 upregulation not resolved\", \"Single-lab mouse and patient data\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Characterized the apoptotic and signaling pathways downstream of metabolic failure (PERK, PI3K/Akt, intrinsic mitochondrial apoptosis) and showed N-/O-glycan defects on the NADPH oxidase subunit gp91(phox), and defined glucose-responsive transcriptional control of the G6PC3 promoter.\",\n      \"evidence\": \"Western blotting and apoptosis assays in G6pc3-/- mice; mass spectrometric glycomics of patient neutrophils; promoter-luciferase reporter with deletion mutagenesis\",\n      \"pmids\": [\"21292774\", \"21385794\", \"21474354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from glycolytic deficit to hypoglycosylation not directly demonstrated\", \"Promoter regulation studied in cell lines without in vivo confirmation\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved whether neutropenia is a survival or differentiation defect by genetic epistasis, showing both contribute and implicating Bim/Bax-dependent apoptosis at differentiation onset.\",\n      \"evidence\": \"Hoxb8 progenitor model with Bcl-XL transgenic rescue, Bim knockdown, and bone marrow transplantation\",\n      \"pmids\": [\"23686134\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Bcl-XL rescued survival but not functional defects, leaving the functional deficit mechanism open\", \"Single-lab model system\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified the toxic substrate by showing G6PC3 and G6PT hydrolyze 1,5-AG6P, whose accumulation inhibits hexokinases and causes glycolytic failure, and demonstrated in vivo rescue by lowering blood 1,5-anhydroglucitol.\",\n      \"evidence\": \"Enzymology, metabolomics, and SGLT2 inhibitor treatment of G6pc3-/- mice\",\n      \"pmids\": [\"30626647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether 1,5-AG6P repair explains the DNA repair or meiotic roles\", \"Human therapeutic validation not yet performed at this stage\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Quantified the downstream metabolic and functional consequences, tracing impaired glycolysis and hexose monophosphate shunt flux to defective NADPH-dependent respiratory burst, migration, and bacterial killing.\",\n      \"evidence\": \"Stable isotope tracing metabolomics with neutrophil functional assays; flow cytometry and glucose supplementation rescue\",\n      \"pmids\": [\"33259599\", \"32930428\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Patient-cell studies from limited donors\", \"Glucose rescue was only partial\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Translated the 1,5-AG6P mechanism to humans by showing empagliflozin lowers neutrophil 1,5-AG6P and normalizes counts, confirming the metabolite-repair model clinically.\",\n      \"evidence\": \"Clinical SGLT2 inhibitor treatment with metabolite measurement and neutrophil counts in patients\",\n      \"pmids\": [\"35506446\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only two patients\", \"Long-term efficacy and effects on non-myeloid functions not assessed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended G6PC3 function beyond metabolism by demonstrating an essential meiotic role in XY body formation and meiotic sex chromosome inactivation in spermatocytes.\",\n      \"evidence\": \"CRISPR-Cas9 knockout mouse with immunofluorescence localization, meiotic staging, and MSCI assessment\",\n      \"pmids\": [\"39420835\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism linking phosphatase activity to MSCI unknown\", \"Whether a metabolic substrate underlies the meiotic role is unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a genome-stability role by showing G6PC3 promotes HR-repair gene expression and BRCA1 recruitment to double-strand breaks, with deficiency accelerating tumorigenesis.\",\n      \"evidence\": \"RNAi screen, gammaH2AX/micronuclei assays, HR repair and BRCA1 recruitment assays, RNA-seq, and Trp53-null mouse mammary tumor model\",\n      \"pmids\": [\"40261702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DNA-repair role is a direct enzymatic function or a downstream metabolic consequence is unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ER glucose-6-phosphatase mechanistically connects its metabolite-repair activity to homologous recombination and meiotic sex chromosome inactivation remains unknown.\",\n      \"evidence\": \"No direct evidence in the available corpus links the 1,5-AG6P hydrolysis activity to the DNA-repair or meiotic phenotypes\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No demonstrated substrate or metabolite mediating the DNA repair role\", \"No mechanism connecting phosphatase activity to BRCA1 expression or MSCI\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0016791\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 5, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SLC37A4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}