{"gene":"SLC30A7","run_date":"2026-06-10T07:46:33","timeline":{"discoveries":[{"year":2002,"finding":"ZnT7 is localized in the Golgi apparatus and cytoplasmic vesicles, and facilitates zinc transport from the cytoplasm into the Golgi apparatus; exposure of ZnT7-expressing CHO cells to zinc causes zinc accumulation in the Golgi apparatus.","method":"Immunofluorescence microscopy, zinc accumulation assay in transfected CHO cells, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization with immunofluorescence plus functional zinc accumulation assay in expressing cells, foundational paper replicated by multiple subsequent studies","pmids":["12446736"],"is_preprint":false},{"year":2004,"finding":"ZnT7 (together with ZnT5) is required for loading zinc into alkaline phosphatases (ALPs) in the secretory pathway, converting apo-ALP to holo-ALP; double knockout of ZnT5 and ZnT7 in DT40 cells reduced ALP activity to <5% of wild-type, and re-expression of either ZnT5 or ZnT7 rescued activity.","method":"Gene disruption in DT40 cells, ALP activity assay, overexpression rescue experiment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with enzymatic readout, rescue by re-expression, replicated logic with two paralogs","pmids":["15525635"],"is_preprint":false},{"year":2007,"finding":"Znt7-deficient mice are zinc-deficient (reduced zinc in serum, liver, bone, kidney, small intestine; ~50% cellular zinc in embryonic fibroblasts), show reduced dietary zinc absorption, and display reduced body fat accumulation; the growth defect cannot be corrected by dietary zinc supplementation.","method":"Gene-trap knockout mouse model, zinc content measurement in tissues and cells, radioactive zinc feeding study","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — well-characterized knockout mouse with multiple orthogonal tissue zinc measurements and dietary rescue experiment","pmids":["17954933"],"is_preprint":false},{"year":2009,"finding":"ZnT7 is localized to the Golgi apparatus membrane in Purkinje cells, Bergmann glial cells, and granule cells of the mouse cerebellum, as confirmed by co-localization with the trans-Golgi marker TGN38 and immuno-electron microscopy.","method":"Immunofluorescence confocal microscopy, immuno-electron microscopy, Western blot","journal":"Histology and histopathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immuno-EM with TGN38 co-localization, single lab","pmids":["19283665"],"is_preprint":false},{"year":2009,"finding":"ZnT7 is localized to the Golgi apparatus in spermatocytes, spermatids, Sertoli cells, and Leydig cells of the mouse testis, co-localizing with the trans-Golgi marker TGN38; ZnT7 and chelatable zinc are distributed in different cell populations in the testis.","method":"Immunohistochemistry, double immunofluorescence with TGN38, zinc autometallographic staining","journal":"Histology and histopathology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization with Golgi marker, single lab, no functional consequence demonstrated","pmids":["19012241"],"is_preprint":false},{"year":2010,"finding":"Overexpression of ZnT7 in RIN5mF pancreatic beta-cells increases insulin mRNA expression, insulin protein synthesis, and total cellular insulin content; this effect is mediated through metal-responsive transcription factor Mtf1 binding to metal-responsive elements (MREs) in the Ins1 and Ins2 gene promoters.","method":"Overexpression in RIN5mF cells, quantitative RT-PCR, 35S metabolic labeling, promoter MRE identification, Mtf1 binding assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (metabolic labeling, RT-PCR, transcription factor binding), single lab","pmids":["20599947"],"is_preprint":false},{"year":2011,"finding":"Znt7-null mutation in a TRAMP prostate cancer mouse model accelerates prostate tumor formation, increases frequency of high-grade PIN, promotes metastasis to lymph nodes, and reduces apoptosis in the prostate.","method":"TRAMP/Znt7-/- transgenic mouse model, histopathological analysis, apoptosis measurement","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO in cancer model with histopathological and apoptosis readouts, single lab","pmids":["21621325"],"is_preprint":false},{"year":2012,"finding":"ZnT7 in skeletal muscle supports insulin signaling; Znt7-KO mice fed a high-fat diet develop glucose intolerance and insulin resistance associated with down-regulated Insr, Irs2, and Akt1 mRNA in skeletal muscle; overexpression of ZnT7 in L6 skeletal muscle cells increased Irs2 mRNA, Irs2 and Akt phosphorylation, and glucose uptake.","method":"Znt7-KO mouse model, high-fat diet challenge, oral glucose tolerance test, insulin tolerance test, overexpression in L6 cells, quantitative RT-PCR, Western blot, glucose uptake assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with metabolic phenotyping plus gain-of-function in cell line with multiple orthogonal readouts","pmids":["22854958"],"is_preprint":false},{"year":2013,"finding":"ZnT7 overexpression protects MC3T3-E1 osteoblasts from H2O2-induced apoptosis by reducing intracellular free zinc accumulation; this protective effect is mediated through activation of PI3K/Akt and MAPK/ERK signaling pathways; ZnT7 siRNA knockdown exacerbates apoptosis.","method":"Overexpression and siRNA knockdown in MC3T3-E1 cells, H2O2 treatment, apoptosis assay, Western blot for pathway activation","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with pathway readouts, single lab","pmids":["23403124"],"is_preprint":false},{"year":2016,"finding":"Combined deletion of Slc30a7 (ZnT7) and Slc30a8 (ZnT8) in mice abolishes glucose-stimulated insulin secretion (GSIS) in isolated islets, whereas deletion of either gene alone has no effect on GSIS in isolated islets; Slc30a7 deletion alone impairs glucose tolerance in vivo, reduces glucose-stimulated plasma insulin, pancreatic insulin content, hepatic glycogen, and alters islet morphology increasing the α- to β-cell ratio.","method":"Single and double knockout mice, oral glucose tolerance test, GSIS in isolated islets, pancreatic insulin content measurement, islet morphology analysis","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis with double KO unmasking ZnT8 function, multiple orthogonal metabolic readouts","pmids":["27754787"],"is_preprint":false},{"year":2017,"finding":"ZnT7 is localized to the sarco(endo)plasmic reticulum (S(E)R) in cardiomyocytes; under hyperglycemia, decreased ZnT7 expression combined with increased ZIP7 activity causes redistribution of free Zn2+ (increased cytosolic, decreased S(E)R Zn2+) and contributes to ER stress and cardiac dysfunction.","method":"Subcellular fractionation, S(E)R isolation, FRET-based Zn2+ sensors, siRNA silencing of CK2α, Western blot","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by fractionation plus FRET functional measurement, single lab","pmids":["28232492"],"is_preprint":false},{"year":2017,"finding":"ZNT7 physically interacts with CD40 in B lymphocytes (demonstrated by immunoprecipitation); ZNT7 knockdown reduces CD40 cell surface expression and impairs CD154-CD40-mediated p38 MAPK phosphorylation; ZNT7 overexpression up-regulates this signaling.","method":"Immunoprecipitation, flow cytometry for CD40 surface expression, Western blot for p38 MAPK phosphorylation, siRNA knockdown and overexpression","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP with reciprocal gain/loss-of-function signaling readouts, single lab","pmids":["28469980"],"is_preprint":false},{"year":2018,"finding":"ZnT7 is also localized to mitochondria (mitochondrial matrix) in cardiomyocytes in addition to the S(E)R; under hyperglycemia, increased ZnT7 on mitochondria is associated with elevated mitochondrial free Zn2+, increased ROS, depolarized mitochondrial membrane potential, and altered S(E)R-mitochondria coupling protein expression.","method":"Fluorescence microscopy, mitochondrial fractionation, biochemical analysis, FRET Zn2+ sensors","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — orthogonal localization methods (immunofluorescence + fractionation), functional Zn2+ measurements, single lab","pmids":["29307859"],"is_preprint":false},{"year":2018,"finding":"ZnT7 protects renal tubular epithelial cells (NRK-52E) from high glucose-induced epithelial-to-mesenchymal transition (EMT); ZnT7 knockdown enhances EMT and activates MAPK/ERK and TGF-β/Smad pathways; ZnT7 overexpression inhibits these effects.","method":"Overexpression and siRNA knockdown in NRK-52E cells, Western blot for EMT markers and pathway activation, dual-fluorescent localization","journal":"Kidney & blood pressure research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with pathway readouts, single lab","pmids":["29627824"],"is_preprint":false},{"year":2018,"finding":"In znt7-KO skeletal muscle, insulin resistance is mechanistically linked to increased intracellular fatty acid levels, intracellular lipid accumulation, and elevated production of bioactive lipid mediators (12,13-DiHOME and 12-HETE); this is accompanied by up-regulation of Fabp3, Cd36, Slc27a1, and Slc27a4 fatty acid transporters and increased fatty acid oxidative capacity with enlarged mitochondria.","method":"znt7-KO mice, fatty acid and oxylipin profiling, electron microscopy, immunohistochemistry, quantitative RT-PCR, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (lipidomics, EM, IHC, molecular) in clean KO model revealing mechanism","pmids":["29555680"],"is_preprint":false},{"year":2020,"finding":"SLC30A7 knockdown decreases intracellular free zinc levels and reduces zinc distribution in the Golgi apparatus; SLC30A7 has anti-apoptotic effects in high glucose-induced apoptosis in renal tubular cells via the NFE2L2/HMOX1 signaling pathway; knockdown of NFE2L2 decreases SLC30A7 activity and increases apoptosis.","method":"siRNA knockdown, real-time RT-PCR, Western blot, intracellular zinc measurement, STZ-induced diabetic mouse model","journal":"Diabetes research and clinical practice","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with pathway readouts and in vivo model, single lab","pmids":["32949653"],"is_preprint":false},{"year":2021,"finding":"In Drosophila, silencing of dZnT7 (the ZnT7 ortholog, localized on the Golgi apparatus) in a RafGOF scrib-/- tumor model enhances tumor growth, invasion, and migration; mechanistically, zinc deficiency in the Golgi caused by dZnT7 RNAi induces ER stress which activates JNK signaling via Atg9, promoting cell-autonomous and non-autonomous autophagy.","method":"Drosophila RNAi genetics, tumor growth/invasion assay, JNK pathway analysis, Atg9 epistasis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with pathway analysis in Drosophila tumor model, single lab","pmids":["33649534"],"is_preprint":false},{"year":2022,"finding":"miR-200c-3p directly targets SLC30A7 in human retinal microvascular endothelial cells (validated by dual luciferase reporter); miR-200c-3p negatively regulates SLC30A7 expression, and its knockdown mitigates high glucose-induced pyroptosis.","method":"Dual luciferase reporter assay, RT-qPCR, siRNA knockdown, Western blot, ELISA","journal":"Human & experimental toxicology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct binding validated by luciferase assay with functional pyroptosis readout, single lab","pmids":["35607288"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structures of human ZnT7 at 2.2–3.1 Å resolution reveal: (1) ZnT7 functions as a homodimer with tight interactions in both cytosolic and transmembrane (TM) domains; (2) each protomer has a single Zn2+-binding site in the TM domain; (3) ZnT7 operates as a Zn2+/H+ antiporter undergoing TM-helix rearrangement between inward-facing (negatively charged cytosolic cavity for Zn2+ entry) and outward-facing (widened luminal cavity for Zn2+ release) conformations; (4) the exceptionally long cytosolic histidine-rich loop binds two Zn2+ ions, seemingly facilitating Zn2+ recruitment to the TM transport pathway.","method":"Cryo-EM structure determination (2.2–3.1 Å), Zn2+-bound and unbound forms","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structures in two conformational states with bound and unbound ligand, mechanistic inference directly from atomic coordinates","pmids":["37553324"],"is_preprint":false},{"year":2023,"finding":"ZnT7 is localized on the mitochondrial matrix in cardiomyoblasts; ZnT7 overexpression increases mitochondrial free Zn2+ ([Zn2+]Mit), elevates ROS production, depolarizes mitochondrial membrane potential, increases markers of mitochondria-associated apoptosis and autophagy, and alters histone methylation marks (H3K27me3 and H3K36me1), linking ZnT7-mediated Zn2+ buffering to epigenetic regulation.","method":"Confocal immunofluorescence, FRET-based Zn2+/Ca2+ sensors, ROS measurement, mitochondrial membrane potential assay, Western blot for histone modifications","journal":"Journal of trace elements in medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods for localization and functional readouts, single lab","pmids":["37196548"],"is_preprint":false},{"year":2023,"finding":"Compound heterozygous loss-of-function variants in SLC30A7 (c.21dup causing premature stop, and c.842+15T>C causing leaky splicing with premature stop) result in 80–96% reduction in ZnT7 protein in affected individuals with stunted growth, testicular hypoplasia, and bone marrow failure (Ziegler-Huang Syndrome/BMF8).","method":"Exome sequencing, RNA-seq splicing analysis, Western blot for protein expression in patient cells","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — molecular characterization of human loss-of-function variants with protein quantification, single family/lab","pmids":["36821639"],"is_preprint":false},{"year":2024,"finding":"ZnT7 (as part of ZNT5-6 heterodimers and ZNT7 homodimers) supplies Zn2+ to Golgi α-mannosidase II (GMII), a key enzyme in N-glycan processing; loss of ZNT5-6 and ZNT7 function markedly reduces GMII activity and causes accumulation of hybrid-type N-glycans with reduction of complex-type glycans; lysosomal mannosidase (LAMAN) activity is not affected.","method":"Genetic disruption of ZNT5-6 and ZNT7 in cells, GMII enzyme activity assay, N-glycan profiling, xenograft tumor growth model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with enzymatic and glycomic readouts, specificity confirmed by LAMAN negative control, in vivo xenograft validation","pmids":["38762179"],"is_preprint":false},{"year":2025,"finding":"ZNT7 deficiency in patient-derived B-EBV lymphoblasts causes excessive TP53 expression and decreased AKT activation; overexpression of wild-type ZNT7 in patient fibroblasts rescues insulin-stimulated AKT pathway activation; ZNT7 is expressed in myeloid and lymphoid lineage cells in human bone marrow, and Znt7-KO mice develop progressive cytopenia.","method":"Western blot for TP53 and pAKT in patient cells, wild-type ZNT7 transduction rescue, fluorescence microscopy for lineage co-expression, hematological analysis of Znt7-KO mice","journal":"Journal of trace elements in medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function rescue experiment plus KO mouse phenotype with molecular pathway readouts, single lab","pmids":["40286389"],"is_preprint":false},{"year":2026,"finding":"ERK1 specifically binds SLC30A7 and phosphorylates it at T297, driving redistribution of Zn2+ from cytosol into the Golgi lumen; SLC30A7 cooperates with zinc metallochaperone ZNG1 to mobilize Golgi zinc toward MMP2/3/9 activation, leading to E-cadherin degradation, β-catenin nuclear translocation, and MYC transcription in esophageal squamous cell carcinoma.","method":"Genetic deletion in mouse 4NQO tumorigenesis model, siRNA knockdown, ERK1 binding and phosphorylation assays (T297 site), co-IP for ZNG1 interaction, MMP activity assays, β-catenin pathway analysis, PDX model with ERK inhibitor nanoplatform","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KO in vivo, phosphorylation site identification, Co-IP, pathway assays), single lab, awaiting replication","pmids":["42190790"],"is_preprint":false}],"current_model":"SLC30A7 (ZnT7) is a Golgi-localized Zn2+/H+ antiporter that functions as a homodimer (resolved by cryo-EM at 2.2–3.1 Å) to transport cytoplasmic Zn2+ into the Golgi lumen via an alternating-access mechanism, with a histidine-rich cytosolic loop recruiting Zn2+ to the transmembrane transport pathway; in the Golgi it supplies Zn2+ to metalloenzymes including alkaline phosphatases and Golgi α-mannosidase II (supporting N-glycosylation), and can be phosphorylated by ERK1 at T297 to enhance Golgi zinc loading and MMP/β-catenin oncogenic signaling; systemically, ZnT7 supports dietary zinc absorption, insulin gene transcription via Mtf1 in pancreatic β-cells, insulin signaling in skeletal muscle, and CD40-mediated immune signaling in B cells, with loss-of-function in humans causing Ziegler-Huang Syndrome (bone marrow failure, growth retardation, testicular hypoplasia) linked to impaired AKT activation and elevated TP53."},"narrative":{"mechanistic_narrative":"SLC30A7 (ZnT7) is a Golgi-localized Zn2+/H+ antiporter that supplies cytoplasmic zinc to the secretory pathway and thereby supports the activation of zinc-dependent metalloenzymes and broad zinc-homeostatic functions in the cell [PMID:12446736, PMID:37553324]. Cryo-EM structures resolve ZnT7 as a homodimer in which each protomer carries a single transmembrane Zn2+-binding site and cycles between inward- and outward-facing conformations, while an unusually long cytosolic histidine-rich loop binds Zn2+ and recruits it to the transmembrane transport pathway [PMID:37553324]. Within the Golgi, ZnT7 (acting alongside ZnT5) loads zinc into alkaline phosphatases to generate active holo-enzyme [PMID:15525635] and supplies Zn2+ to Golgi α-mannosidase II to support N-glycan maturation [PMID:38762179]. Systemically, ZnT7 drives dietary zinc absorption and whole-body zinc accumulation [PMID:17954933], promotes insulin gene transcription in pancreatic β-cells via the metal-responsive transcription factor Mtf1 [PMID:20599947], and is required—together with ZnT8—for glucose-stimulated insulin secretion [PMID:27754787], while in skeletal muscle it sustains insulin signaling and lipid handling, its loss producing glucose intolerance, insulin resistance, and intracellular lipid accumulation [PMID:22854958, PMID:29555680]. ZnT7 deficiency repeatedly engages stress and survival signaling, modulating PI3K/Akt and MAPK/ERK pathways and apoptosis across multiple cell types [PMID:23403124, PMID:32949653], and ERK1 phosphorylation of ZnT7 at T297 enhances Golgi zinc loading to drive MMP-mediated β-catenin oncogenic signaling [PMID:42190790]. Compound heterozygous loss-of-function variants in SLC30A7 cause Ziegler-Huang Syndrome (bone marrow failure, growth retardation, testicular hypoplasia), associated with impaired AKT activation and elevated TP53 [PMID:36821639, PMID:40286389].","teleology":[{"year":2002,"claim":"Established the core identity of ZnT7 by showing it resides in the Golgi and moves cytoplasmic zinc into the Golgi lumen, defining its directionality and compartment.","evidence":"Immunofluorescence and zinc accumulation assays in transfected CHO cells","pmids":["12446736"],"confidence":"High","gaps":["Transport mechanism and stoichiometry not defined","No evidence of physiological substrate enzymes yet"]},{"year":2004,"claim":"Connected ZnT7 transport activity to a functional output by demonstrating it loads zinc into secretory-pathway alkaline phosphatases, converting apo- to holo-enzyme.","evidence":"Gene disruption in DT40 cells with ALP activity assay and re-expression rescue","pmids":["15525635"],"confidence":"High","gaps":["Redundancy with ZnT5 leaves individual contributions partly unresolved","Other Golgi metalloenzyme clients not yet tested"]},{"year":2007,"claim":"Defined the systemic role of ZnT7 in dietary zinc absorption and whole-body zinc status using a knockout mouse, showing growth effects not rescuable by dietary zinc.","evidence":"Gene-trap knockout mouse with tissue/cell zinc measurements and radioactive zinc feeding","pmids":["17954933"],"confidence":"High","gaps":["Cell-autonomous versus systemic basis of growth defect unresolved","Molecular link between Golgi zinc loading and absorption not established"]},{"year":2010,"claim":"Linked ZnT7 to insulin biology by showing it raises insulin gene transcription through Mtf1 acting on metal-responsive elements, implicating zinc-driven gene regulation.","evidence":"Overexpression in RIN5mF cells with RT-PCR, metabolic labeling, and Mtf1/MRE binding analysis","pmids":["20599947"],"confidence":"Medium","gaps":["Single overexpression system, no loss-of-function confirmation","Direct demonstration of Golgi zinc gradient driving Mtf1 lacking"]},{"year":2012,"claim":"Extended ZnT7 function to peripheral insulin action, showing skeletal-muscle ZnT7 supports the Insr/Irs2/Akt axis and glucose uptake.","evidence":"Znt7-KO mice with metabolic phenotyping plus gain-of-function in L6 muscle cells","pmids":["22854958"],"confidence":"High","gaps":["Mechanistic link between Golgi zinc and Akt signaling not defined","Whether effect is direct or secondary to lipid changes unresolved"]},{"year":2016,"claim":"Resolved genetic redundancy in β-cell secretion by showing combined ZnT7/ZnT8 deletion abolishes glucose-stimulated insulin secretion while ZnT7 alone impairs glucose tolerance and islet composition.","evidence":"Single and double knockout mice with islet GSIS, insulin content, and morphology analysis","pmids":["27754787"],"confidence":"High","gaps":["Molecular basis of ZnT7/ZnT8 functional overlap unclear","Cause of altered α-to-β cell ratio not established"]},{"year":2018,"claim":"Defined the mechanism of muscle insulin resistance in ZnT7 loss as lipid-driven, linking zinc dyshomeostasis to fatty-acid accumulation and bioactive lipid mediators.","evidence":"znt7-KO mice with lipidomics, oxylipin profiling, EM, and molecular analysis","pmids":["29555680"],"confidence":"High","gaps":["Causal chain from Golgi zinc to lipid transporter upregulation unresolved","Which zinc-dependent enzyme drives lipid phenotype unknown"]},{"year":2018,"claim":"Implicated ZnT7 in cytoprotection and disease signaling across tissues, modulating PI3K/Akt, MAPK/ERK, and TGF-β/Smad pathways in osteoblasts and renal cells.","evidence":"Reciprocal overexpression/knockdown with apoptosis and EMT readouts in MC3T3-E1, NRK-52E, and cardiomyocyte models","pmids":["23403124","29627824","29307859"],"confidence":"Medium","gaps":["Single-lab cell-line studies, in vivo confirmation limited","Direct molecular target connecting ZnT7 to these pathways not identified"]},{"year":2017,"claim":"Identified a physical interaction between ZnT7 and CD40, placing ZnT7 in immune receptor signaling in B cells.","evidence":"Immunoprecipitation with flow cytometry and p38 MAPK phosphorylation readouts under knockdown/overexpression","pmids":["28469980"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal structural validation","Mechanism by which ZnT7 controls CD40 surface expression unknown"]},{"year":2023,"claim":"Provided the structural mechanism, revealing ZnT7 as a homodimeric Zn2+/H+ antiporter with an alternating-access cycle and a histidine-rich loop that recruits zinc to the transport path.","evidence":"Cryo-EM structures at 2.2–3.1 Å in Zn2+-bound and unbound states","pmids":["37553324"],"confidence":"High","gaps":["Proton coupling stoichiometry not quantified","Regulatory inputs onto the histidine-rich loop in vivo not addressed"]},{"year":2023,"claim":"Established the genetic link to human disease, identifying compound heterozygous loss-of-function SLC30A7 variants causing Ziegler-Huang Syndrome.","evidence":"Exome sequencing, RNA-seq splicing analysis, and patient-cell protein quantification","pmids":["36821639"],"confidence":"Medium","gaps":["Single family/lab, genotype-phenotype breadth unknown","Mechanism connecting ZnT7 loss to bone marrow failure not yet defined here"]},{"year":2024,"claim":"Identified Golgi α-mannosidase II as a ZnT7 client enzyme, mechanistically linking ZnT7 to N-glycan maturation with specificity confirmed against lysosomal mannosidase.","evidence":"Genetic disruption of ZNT5-6/ZNT7 with GMII activity assay, N-glycan profiling, and xenograft validation","pmids":["38762179"],"confidence":"High","gaps":["Full repertoire of Golgi metalloenzyme clients incomplete","Contribution of glycosylation defect to organismal phenotypes unquantified"]},{"year":2025,"claim":"Connected human ZnT7 loss to the AKT/TP53 axis and hematopoiesis, with wild-type rescue restoring insulin-stimulated AKT and KO mice modeling cytopenia.","evidence":"Patient-cell Western blots, wild-type ZNT7 transduction rescue, bone marrow lineage co-expression, and Znt7-KO hematology","pmids":["40286389"],"confidence":"Medium","gaps":["Mechanism linking Golgi zinc to TP53 elevation unresolved","Single-lab model of bone marrow failure"]},{"year":2026,"claim":"Defined a post-translational regulatory axis, showing ERK1 phosphorylates ZnT7 at T297 to enhance Golgi zinc loading and drive MMP/β-catenin oncogenic signaling.","evidence":"Mouse 4NQO tumorigenesis KO, phosphosite mapping, ZNG1 Co-IP, MMP and β-catenin pathway assays, PDX model","pmids":["42190790"],"confidence":"Medium","gaps":["Single lab, awaiting independent replication","Direct structural basis of T297 phosphorylation effect on transport not shown"]},{"year":null,"claim":"How a single Golgi zinc-loading transporter mechanistically dictates such diverse outcomes—glycosylation, insulin secretion, lipid metabolism, hematopoiesis, and oncogenic signaling—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking compartmental zinc gradients to downstream signaling pathways","Tissue-specific client enzyme repertoires undefined","In vivo significance of mitochondrial/SER ZnT7 pools relative to Golgi pool unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,18,21]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[0,18]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[18]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,3,4,15,21]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[10]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[12,19]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,21]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,2,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,8,11,23]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[9,14]}],"complexes":[],"partners":["SLC30A5","CD40","ERK1","ZNG1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NEW0","full_name":"Zinc transporter 7","aliases":["Solute carrier family 30 member 7","Znt-like transporter 2"],"length_aa":376,"mass_kda":41.6,"function":"Zinc ion transporter mediating zinc entry from the cytosol into the lumen of organelles along the secretory pathway (PubMed:15525635, PubMed:15994300). By contributing to zinc ion homeostasis within the early secretory pathway, regulates the activation and folding of enzymes like alkaline phosphatases (PubMed:15525635, PubMed:15994300)","subcellular_location":"Golgi apparatus membrane; Cytoplasmic vesicle; Golgi apparatus, trans-Golgi network; Sarcoplasmic reticulum; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q8NEW0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC30A7","classification":"Not Classified","n_dependent_lines":65,"n_total_lines":1208,"dependency_fraction":0.05380794701986755},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"YIPF5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SLC30A7","total_profiled":1310},"omim":[{"mim_id":"620501","title":"ZIEGLER-HUANG SYNDROME; ZHS","url":"https://www.omim.org/entry/620501"},{"mim_id":"614675","title":"BONE MARROW FAILURE SYNDROME 1; BMFS1","url":"https://www.omim.org/entry/614675"},{"mim_id":"611149","title":"SOLUTE CARRIER FAMILY 30 (ZINC TRANSPORTER), MEMBER 7; SLC30A7","url":"https://www.omim.org/entry/611149"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SLC30A7"},"hgnc":{"alias_symbol":["ZnTL2","ZNT7"],"prev_symbol":[]},"alphafold":{"accession":"Q8NEW0","domains":[{"cath_id":"1.20.1510.10","chopping":"19-162_231-295","consensus_level":"high","plddt":83.501,"start":19,"end":295},{"cath_id":"3.30.70.1350","chopping":"301-374","consensus_level":"high","plddt":92.4373,"start":301,"end":374}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NEW0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NEW0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NEW0-F1-predicted_aligned_error_v6.png","plddt_mean":75.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC30A7","jax_strain_url":"https://www.jax.org/strain/search?query=SLC30A7"},"sequence":{"accession":"Q8NEW0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NEW0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NEW0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NEW0"}},"corpus_meta":[{"pmid":"12446736","id":"PMC_12446736","title":"ZnT7, a novel mammalian zinc transporter, accumulates zinc in the Golgi apparatus.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12446736","citation_count":227,"is_preprint":false},{"pmid":"15525635","id":"PMC_15525635","title":"Zinc transporters, ZnT5 and ZnT7, are required for the activation of alkaline phosphatases, zinc-requiring enzymes that are glycosylphosphatidylinositol-anchored to the cytoplasmic membrane.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15525635","citation_count":137,"is_preprint":false},{"pmid":"17954933","id":"PMC_17954933","title":"Znt7 (Slc30a7)-deficient mice display reduced body zinc status and body fat accumulation.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17954933","citation_count":88,"is_preprint":false},{"pmid":"28232492","id":"PMC_28232492","title":"Hyperglycemia-Induced Changes in ZIP7 and ZnT7 Expression Cause Zn2+ Release From the Sarco(endo)plasmic Reticulum and Mediate ER Stress in the Heart.","date":"2017","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/28232492","citation_count":73,"is_preprint":false},{"pmid":"22854958","id":"PMC_22854958","title":"Znt7-null mice are more susceptible to diet-induced glucose intolerance and insulin resistance.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22854958","citation_count":62,"is_preprint":false},{"pmid":"23403124","id":"PMC_23403124","title":"ZnT7 can protect MC3T3-E1 cells from oxidative stress-induced apoptosis via PI3K/Akt and MAPK/ERK signaling pathways.","date":"2013","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/23403124","citation_count":58,"is_preprint":false},{"pmid":"20599947","id":"PMC_20599947","title":"Over-expression of ZnT7 increases insulin synthesis and secretion in pancreatic beta-cells by promoting insulin gene transcription.","date":"2010","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/20599947","citation_count":47,"is_preprint":false},{"pmid":"29307859","id":"PMC_29307859","title":"Zn2+-transporters ZIP7 and ZnT7 play important role in progression of cardiac dysfunction via affecting sarco(endo)plasmic reticulum-mitochondria coupling in hyperglycemic cardiomyocytes.","date":"2018","source":"Mitochondrion","url":"https://pubmed.ncbi.nlm.nih.gov/29307859","citation_count":40,"is_preprint":false},{"pmid":"29555680","id":"PMC_29555680","title":"Aberrant fatty acid metabolism in skeletal muscle contributes to insulin resistance in zinc transporter 7 (znt7)-knockout mice.","date":"2018","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29555680","citation_count":39,"is_preprint":false},{"pmid":"27754787","id":"PMC_27754787","title":"Combined Deletion of Slc30a7 and Slc30a8 Unmasks a Critical Role for ZnT8 in Glucose-Stimulated Insulin Secretion.","date":"2016","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/27754787","citation_count":34,"is_preprint":false},{"pmid":"21621325","id":"PMC_21621325","title":"A null-mutation in the Znt7 gene accelerates prostate tumor formation in a transgenic adenocarcinoma mouse prostate model.","date":"2011","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/21621325","citation_count":32,"is_preprint":false},{"pmid":"37553324","id":"PMC_37553324","title":"Cryo-EM structures of human zinc transporter ZnT7 reveal the mechanism of Zn2+ uptake into the Golgi apparatus.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37553324","citation_count":22,"is_preprint":false},{"pmid":"35607288","id":"PMC_35607288","title":"MiR-200c-3p regulates pyroptosis by targeting SLC30A7 in diabetic retinopathy.","date":"2022","source":"Human & experimental toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/35607288","citation_count":19,"is_preprint":false},{"pmid":"33649534","id":"PMC_33649534","title":"ZnT7 RNAi favors RafGOFscrib-/--induced tumor growth and invasion in Drosophila through JNK signaling pathway.","date":"2021","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/33649534","citation_count":16,"is_preprint":false},{"pmid":"29627824","id":"PMC_29627824","title":"Protective Effect of Znt7 on High Glucose-Induced Epithelial-to-Mesenchymal Transition in Renal Tubular Epithelial Cells.","date":"2018","source":"Kidney & blood pressure research","url":"https://pubmed.ncbi.nlm.nih.gov/29627824","citation_count":16,"is_preprint":false},{"pmid":"19283665","id":"PMC_19283665","title":"Golgi apparatus localization of ZNT7 in the mouse cerebellum.","date":"2009","source":"Histology and histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/19283665","citation_count":12,"is_preprint":false},{"pmid":"19012241","id":"PMC_19012241","title":"ZNT7 and Zn2+ are present in different cell populations in the mouse testis.","date":"2009","source":"Histology and histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/19012241","citation_count":11,"is_preprint":false},{"pmid":"32991615","id":"PMC_32991615","title":"The Znt7-null mutation has sex dependent effects on the gut microbiota and goblet cell population in the mouse colon.","date":"2020","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/32991615","citation_count":10,"is_preprint":false},{"pmid":"28469980","id":"PMC_28469980","title":"ZNT7 binds to CD40 and influences CD154-triggered p38 MAPK activity in B lymphocytes-a possible regulatory mechanism for zinc in immune function.","date":"2017","source":"FEBS open bio","url":"https://pubmed.ncbi.nlm.nih.gov/28469980","citation_count":9,"is_preprint":false},{"pmid":"38762179","id":"PMC_38762179","title":"ZNT5-6 and ZNT7 play an integral role in protein N-glycosylation by supplying Zn2+ to Golgi α-mannosidase II.","date":"2024","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38762179","citation_count":8,"is_preprint":false},{"pmid":"37196548","id":"PMC_37196548","title":"Overexpression of Slc30a7/ZnT7 increases the mitochondrial matrix levels of labile Zn2+ and modifies histone modification in hyperinsulinemic cardiomyoblasts.","date":"2023","source":"Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS)","url":"https://pubmed.ncbi.nlm.nih.gov/37196548","citation_count":7,"is_preprint":false},{"pmid":"35751429","id":"PMC_35751429","title":"De novo heterozygous variants in SLC30A7 are a candidate cause for Joubert syndrome.","date":"2022","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/35751429","citation_count":7,"is_preprint":false},{"pmid":"32949653","id":"PMC_32949653","title":"SLC30A7 has anti-oxidant stress effects in high glucose-induced apoptosis via the NFE2L2/HMOX1 signal transduction pathway.","date":"2020","source":"Diabetes research and clinical practice","url":"https://pubmed.ncbi.nlm.nih.gov/32949653","citation_count":7,"is_preprint":false},{"pmid":"24770585","id":"PMC_24770585","title":"Linking cellular zinc status to body weight and fat mass: mapping quantitative trait loci in Znt7 knockout mice.","date":"2014","source":"Mammalian genome : official journal of the International Mammalian Genome Society","url":"https://pubmed.ncbi.nlm.nih.gov/24770585","citation_count":7,"is_preprint":false},{"pmid":"36821639","id":"PMC_36821639","title":"Identification of novel compound heterozygous variants in the SLC30A7 (ZNT7) gene in two French brothers with stunted growth, testicular hypoplasia and bone marrow failure.","date":"2023","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36821639","citation_count":6,"is_preprint":false},{"pmid":"30777014","id":"PMC_30777014","title":"Subcongenic analysis of a quantitative trait locus affecting body weight and glucose metabolism in zinc transporter 7 (znt7)-knockout mice.","date":"2019","source":"BMC genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30777014","citation_count":4,"is_preprint":false},{"pmid":"38393693","id":"PMC_38393693","title":"Investigation of cuproptosis regulator-mediated modification patterns and SLC30A7 function in GBM.","date":"2024","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/38393693","citation_count":3,"is_preprint":false},{"pmid":"18499530","id":"PMC_18499530","title":"Expression of zinc transporter ZnT7 in mouse superior cervical ganglion.","date":"2008","source":"Autonomic neuroscience : basic & clinical","url":"https://pubmed.ncbi.nlm.nih.gov/18499530","citation_count":3,"is_preprint":false},{"pmid":"40286389","id":"PMC_40286389","title":"Reduced AKT activation accompanied with high TP53 expression is implicated in the impaired hematogenesis in Ziegler-Huang syndrome and the Znt7 null mice partially recapitulates the human disease linked to pancytopenia.","date":"2025","source":"Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS)","url":"https://pubmed.ncbi.nlm.nih.gov/40286389","citation_count":0,"is_preprint":false},{"pmid":"42190790","id":"PMC_42190790","title":"SLC30A7 phosphorylation by ERK1 promotes esophageal squamous cell carcinoma tumorigenesis via activating MMP2/3/9-β-catenin signaling.","date":"2026","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/42190790","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17519,"output_tokens":6118,"usd":0.072164,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14913,"output_tokens":4585,"usd":0.094595,"stage2_stop_reason":"end_turn"},"total_usd":0.166759,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"ZnT7 is localized in the Golgi apparatus and cytoplasmic vesicles, and facilitates zinc transport from the cytoplasm into the Golgi apparatus; exposure of ZnT7-expressing CHO cells to zinc causes zinc accumulation in the Golgi apparatus.\",\n      \"method\": \"Immunofluorescence microscopy, zinc accumulation assay in transfected CHO cells, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization with immunofluorescence plus functional zinc accumulation assay in expressing cells, foundational paper replicated by multiple subsequent studies\",\n      \"pmids\": [\"12446736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ZnT7 (together with ZnT5) is required for loading zinc into alkaline phosphatases (ALPs) in the secretory pathway, converting apo-ALP to holo-ALP; double knockout of ZnT5 and ZnT7 in DT40 cells reduced ALP activity to <5% of wild-type, and re-expression of either ZnT5 or ZnT7 rescued activity.\",\n      \"method\": \"Gene disruption in DT40 cells, ALP activity assay, overexpression rescue experiment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with enzymatic readout, rescue by re-expression, replicated logic with two paralogs\",\n      \"pmids\": [\"15525635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Znt7-deficient mice are zinc-deficient (reduced zinc in serum, liver, bone, kidney, small intestine; ~50% cellular zinc in embryonic fibroblasts), show reduced dietary zinc absorption, and display reduced body fat accumulation; the growth defect cannot be corrected by dietary zinc supplementation.\",\n      \"method\": \"Gene-trap knockout mouse model, zinc content measurement in tissues and cells, radioactive zinc feeding study\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — well-characterized knockout mouse with multiple orthogonal tissue zinc measurements and dietary rescue experiment\",\n      \"pmids\": [\"17954933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZnT7 is localized to the Golgi apparatus membrane in Purkinje cells, Bergmann glial cells, and granule cells of the mouse cerebellum, as confirmed by co-localization with the trans-Golgi marker TGN38 and immuno-electron microscopy.\",\n      \"method\": \"Immunofluorescence confocal microscopy, immuno-electron microscopy, Western blot\",\n      \"journal\": \"Histology and histopathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immuno-EM with TGN38 co-localization, single lab\",\n      \"pmids\": [\"19283665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZnT7 is localized to the Golgi apparatus in spermatocytes, spermatids, Sertoli cells, and Leydig cells of the mouse testis, co-localizing with the trans-Golgi marker TGN38; ZnT7 and chelatable zinc are distributed in different cell populations in the testis.\",\n      \"method\": \"Immunohistochemistry, double immunofluorescence with TGN38, zinc autometallographic staining\",\n      \"journal\": \"Histology and histopathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-localization with Golgi marker, single lab, no functional consequence demonstrated\",\n      \"pmids\": [\"19012241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Overexpression of ZnT7 in RIN5mF pancreatic beta-cells increases insulin mRNA expression, insulin protein synthesis, and total cellular insulin content; this effect is mediated through metal-responsive transcription factor Mtf1 binding to metal-responsive elements (MREs) in the Ins1 and Ins2 gene promoters.\",\n      \"method\": \"Overexpression in RIN5mF cells, quantitative RT-PCR, 35S metabolic labeling, promoter MRE identification, Mtf1 binding assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (metabolic labeling, RT-PCR, transcription factor binding), single lab\",\n      \"pmids\": [\"20599947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Znt7-null mutation in a TRAMP prostate cancer mouse model accelerates prostate tumor formation, increases frequency of high-grade PIN, promotes metastasis to lymph nodes, and reduces apoptosis in the prostate.\",\n      \"method\": \"TRAMP/Znt7-/- transgenic mouse model, histopathological analysis, apoptosis measurement\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO in cancer model with histopathological and apoptosis readouts, single lab\",\n      \"pmids\": [\"21621325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ZnT7 in skeletal muscle supports insulin signaling; Znt7-KO mice fed a high-fat diet develop glucose intolerance and insulin resistance associated with down-regulated Insr, Irs2, and Akt1 mRNA in skeletal muscle; overexpression of ZnT7 in L6 skeletal muscle cells increased Irs2 mRNA, Irs2 and Akt phosphorylation, and glucose uptake.\",\n      \"method\": \"Znt7-KO mouse model, high-fat diet challenge, oral glucose tolerance test, insulin tolerance test, overexpression in L6 cells, quantitative RT-PCR, Western blot, glucose uptake assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with metabolic phenotyping plus gain-of-function in cell line with multiple orthogonal readouts\",\n      \"pmids\": [\"22854958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ZnT7 overexpression protects MC3T3-E1 osteoblasts from H2O2-induced apoptosis by reducing intracellular free zinc accumulation; this protective effect is mediated through activation of PI3K/Akt and MAPK/ERK signaling pathways; ZnT7 siRNA knockdown exacerbates apoptosis.\",\n      \"method\": \"Overexpression and siRNA knockdown in MC3T3-E1 cells, H2O2 treatment, apoptosis assay, Western blot for pathway activation\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with pathway readouts, single lab\",\n      \"pmids\": [\"23403124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Combined deletion of Slc30a7 (ZnT7) and Slc30a8 (ZnT8) in mice abolishes glucose-stimulated insulin secretion (GSIS) in isolated islets, whereas deletion of either gene alone has no effect on GSIS in isolated islets; Slc30a7 deletion alone impairs glucose tolerance in vivo, reduces glucose-stimulated plasma insulin, pancreatic insulin content, hepatic glycogen, and alters islet morphology increasing the α- to β-cell ratio.\",\n      \"method\": \"Single and double knockout mice, oral glucose tolerance test, GSIS in isolated islets, pancreatic insulin content measurement, islet morphology analysis\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis with double KO unmasking ZnT8 function, multiple orthogonal metabolic readouts\",\n      \"pmids\": [\"27754787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZnT7 is localized to the sarco(endo)plasmic reticulum (S(E)R) in cardiomyocytes; under hyperglycemia, decreased ZnT7 expression combined with increased ZIP7 activity causes redistribution of free Zn2+ (increased cytosolic, decreased S(E)R Zn2+) and contributes to ER stress and cardiac dysfunction.\",\n      \"method\": \"Subcellular fractionation, S(E)R isolation, FRET-based Zn2+ sensors, siRNA silencing of CK2α, Western blot\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by fractionation plus FRET functional measurement, single lab\",\n      \"pmids\": [\"28232492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZNT7 physically interacts with CD40 in B lymphocytes (demonstrated by immunoprecipitation); ZNT7 knockdown reduces CD40 cell surface expression and impairs CD154-CD40-mediated p38 MAPK phosphorylation; ZNT7 overexpression up-regulates this signaling.\",\n      \"method\": \"Immunoprecipitation, flow cytometry for CD40 surface expression, Western blot for p38 MAPK phosphorylation, siRNA knockdown and overexpression\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP with reciprocal gain/loss-of-function signaling readouts, single lab\",\n      \"pmids\": [\"28469980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZnT7 is also localized to mitochondria (mitochondrial matrix) in cardiomyocytes in addition to the S(E)R; under hyperglycemia, increased ZnT7 on mitochondria is associated with elevated mitochondrial free Zn2+, increased ROS, depolarized mitochondrial membrane potential, and altered S(E)R-mitochondria coupling protein expression.\",\n      \"method\": \"Fluorescence microscopy, mitochondrial fractionation, biochemical analysis, FRET Zn2+ sensors\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — orthogonal localization methods (immunofluorescence + fractionation), functional Zn2+ measurements, single lab\",\n      \"pmids\": [\"29307859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZnT7 protects renal tubular epithelial cells (NRK-52E) from high glucose-induced epithelial-to-mesenchymal transition (EMT); ZnT7 knockdown enhances EMT and activates MAPK/ERK and TGF-β/Smad pathways; ZnT7 overexpression inhibits these effects.\",\n      \"method\": \"Overexpression and siRNA knockdown in NRK-52E cells, Western blot for EMT markers and pathway activation, dual-fluorescent localization\",\n      \"journal\": \"Kidney & blood pressure research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with pathway readouts, single lab\",\n      \"pmids\": [\"29627824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In znt7-KO skeletal muscle, insulin resistance is mechanistically linked to increased intracellular fatty acid levels, intracellular lipid accumulation, and elevated production of bioactive lipid mediators (12,13-DiHOME and 12-HETE); this is accompanied by up-regulation of Fabp3, Cd36, Slc27a1, and Slc27a4 fatty acid transporters and increased fatty acid oxidative capacity with enlarged mitochondria.\",\n      \"method\": \"znt7-KO mice, fatty acid and oxylipin profiling, electron microscopy, immunohistochemistry, quantitative RT-PCR, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (lipidomics, EM, IHC, molecular) in clean KO model revealing mechanism\",\n      \"pmids\": [\"29555680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SLC30A7 knockdown decreases intracellular free zinc levels and reduces zinc distribution in the Golgi apparatus; SLC30A7 has anti-apoptotic effects in high glucose-induced apoptosis in renal tubular cells via the NFE2L2/HMOX1 signaling pathway; knockdown of NFE2L2 decreases SLC30A7 activity and increases apoptosis.\",\n      \"method\": \"siRNA knockdown, real-time RT-PCR, Western blot, intracellular zinc measurement, STZ-induced diabetic mouse model\",\n      \"journal\": \"Diabetes research and clinical practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with pathway readouts and in vivo model, single lab\",\n      \"pmids\": [\"32949653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Drosophila, silencing of dZnT7 (the ZnT7 ortholog, localized on the Golgi apparatus) in a RafGOF scrib-/- tumor model enhances tumor growth, invasion, and migration; mechanistically, zinc deficiency in the Golgi caused by dZnT7 RNAi induces ER stress which activates JNK signaling via Atg9, promoting cell-autonomous and non-autonomous autophagy.\",\n      \"method\": \"Drosophila RNAi genetics, tumor growth/invasion assay, JNK pathway analysis, Atg9 epistasis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with pathway analysis in Drosophila tumor model, single lab\",\n      \"pmids\": [\"33649534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-200c-3p directly targets SLC30A7 in human retinal microvascular endothelial cells (validated by dual luciferase reporter); miR-200c-3p negatively regulates SLC30A7 expression, and its knockdown mitigates high glucose-induced pyroptosis.\",\n      \"method\": \"Dual luciferase reporter assay, RT-qPCR, siRNA knockdown, Western blot, ELISA\",\n      \"journal\": \"Human & experimental toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct binding validated by luciferase assay with functional pyroptosis readout, single lab\",\n      \"pmids\": [\"35607288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structures of human ZnT7 at 2.2–3.1 Å resolution reveal: (1) ZnT7 functions as a homodimer with tight interactions in both cytosolic and transmembrane (TM) domains; (2) each protomer has a single Zn2+-binding site in the TM domain; (3) ZnT7 operates as a Zn2+/H+ antiporter undergoing TM-helix rearrangement between inward-facing (negatively charged cytosolic cavity for Zn2+ entry) and outward-facing (widened luminal cavity for Zn2+ release) conformations; (4) the exceptionally long cytosolic histidine-rich loop binds two Zn2+ ions, seemingly facilitating Zn2+ recruitment to the TM transport pathway.\",\n      \"method\": \"Cryo-EM structure determination (2.2–3.1 Å), Zn2+-bound and unbound forms\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structures in two conformational states with bound and unbound ligand, mechanistic inference directly from atomic coordinates\",\n      \"pmids\": [\"37553324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZnT7 is localized on the mitochondrial matrix in cardiomyoblasts; ZnT7 overexpression increases mitochondrial free Zn2+ ([Zn2+]Mit), elevates ROS production, depolarizes mitochondrial membrane potential, increases markers of mitochondria-associated apoptosis and autophagy, and alters histone methylation marks (H3K27me3 and H3K36me1), linking ZnT7-mediated Zn2+ buffering to epigenetic regulation.\",\n      \"method\": \"Confocal immunofluorescence, FRET-based Zn2+/Ca2+ sensors, ROS measurement, mitochondrial membrane potential assay, Western blot for histone modifications\",\n      \"journal\": \"Journal of trace elements in medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods for localization and functional readouts, single lab\",\n      \"pmids\": [\"37196548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Compound heterozygous loss-of-function variants in SLC30A7 (c.21dup causing premature stop, and c.842+15T>C causing leaky splicing with premature stop) result in 80–96% reduction in ZnT7 protein in affected individuals with stunted growth, testicular hypoplasia, and bone marrow failure (Ziegler-Huang Syndrome/BMF8).\",\n      \"method\": \"Exome sequencing, RNA-seq splicing analysis, Western blot for protein expression in patient cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — molecular characterization of human loss-of-function variants with protein quantification, single family/lab\",\n      \"pmids\": [\"36821639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZnT7 (as part of ZNT5-6 heterodimers and ZNT7 homodimers) supplies Zn2+ to Golgi α-mannosidase II (GMII), a key enzyme in N-glycan processing; loss of ZNT5-6 and ZNT7 function markedly reduces GMII activity and causes accumulation of hybrid-type N-glycans with reduction of complex-type glycans; lysosomal mannosidase (LAMAN) activity is not affected.\",\n      \"method\": \"Genetic disruption of ZNT5-6 and ZNT7 in cells, GMII enzyme activity assay, N-glycan profiling, xenograft tumor growth model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with enzymatic and glycomic readouts, specificity confirmed by LAMAN negative control, in vivo xenograft validation\",\n      \"pmids\": [\"38762179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ZNT7 deficiency in patient-derived B-EBV lymphoblasts causes excessive TP53 expression and decreased AKT activation; overexpression of wild-type ZNT7 in patient fibroblasts rescues insulin-stimulated AKT pathway activation; ZNT7 is expressed in myeloid and lymphoid lineage cells in human bone marrow, and Znt7-KO mice develop progressive cytopenia.\",\n      \"method\": \"Western blot for TP53 and pAKT in patient cells, wild-type ZNT7 transduction rescue, fluorescence microscopy for lineage co-expression, hematological analysis of Znt7-KO mice\",\n      \"journal\": \"Journal of trace elements in medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function rescue experiment plus KO mouse phenotype with molecular pathway readouts, single lab\",\n      \"pmids\": [\"40286389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ERK1 specifically binds SLC30A7 and phosphorylates it at T297, driving redistribution of Zn2+ from cytosol into the Golgi lumen; SLC30A7 cooperates with zinc metallochaperone ZNG1 to mobilize Golgi zinc toward MMP2/3/9 activation, leading to E-cadherin degradation, β-catenin nuclear translocation, and MYC transcription in esophageal squamous cell carcinoma.\",\n      \"method\": \"Genetic deletion in mouse 4NQO tumorigenesis model, siRNA knockdown, ERK1 binding and phosphorylation assays (T297 site), co-IP for ZNG1 interaction, MMP activity assays, β-catenin pathway analysis, PDX model with ERK inhibitor nanoplatform\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KO in vivo, phosphorylation site identification, Co-IP, pathway assays), single lab, awaiting replication\",\n      \"pmids\": [\"42190790\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC30A7 (ZnT7) is a Golgi-localized Zn2+/H+ antiporter that functions as a homodimer (resolved by cryo-EM at 2.2–3.1 Å) to transport cytoplasmic Zn2+ into the Golgi lumen via an alternating-access mechanism, with a histidine-rich cytosolic loop recruiting Zn2+ to the transmembrane transport pathway; in the Golgi it supplies Zn2+ to metalloenzymes including alkaline phosphatases and Golgi α-mannosidase II (supporting N-glycosylation), and can be phosphorylated by ERK1 at T297 to enhance Golgi zinc loading and MMP/β-catenin oncogenic signaling; systemically, ZnT7 supports dietary zinc absorption, insulin gene transcription via Mtf1 in pancreatic β-cells, insulin signaling in skeletal muscle, and CD40-mediated immune signaling in B cells, with loss-of-function in humans causing Ziegler-Huang Syndrome (bone marrow failure, growth retardation, testicular hypoplasia) linked to impaired AKT activation and elevated TP53.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLC30A7 (ZnT7) is a Golgi-localized Zn2+/H+ antiporter that supplies cytoplasmic zinc to the secretory pathway and thereby supports the activation of zinc-dependent metalloenzymes and broad zinc-homeostatic functions in the cell [#0, #18]. Cryo-EM structures resolve ZnT7 as a homodimer in which each protomer carries a single transmembrane Zn2+-binding site and cycles between inward- and outward-facing conformations, while an unusually long cytosolic histidine-rich loop binds Zn2+ and recruits it to the transmembrane transport pathway [#18]. Within the Golgi, ZnT7 (acting alongside ZnT5) loads zinc into alkaline phosphatases to generate active holo-enzyme [#1] and supplies Zn2+ to Golgi α-mannosidase II to support N-glycan maturation [#21]. Systemically, ZnT7 drives dietary zinc absorption and whole-body zinc accumulation [#2], promotes insulin gene transcription in pancreatic β-cells via the metal-responsive transcription factor Mtf1 [#5], and is required—together with ZnT8—for glucose-stimulated insulin secretion [#9], while in skeletal muscle it sustains insulin signaling and lipid handling, its loss producing glucose intolerance, insulin resistance, and intracellular lipid accumulation [#7, #14]. ZnT7 deficiency repeatedly engages stress and survival signaling, modulating PI3K/Akt and MAPK/ERK pathways and apoptosis across multiple cell types [#8, #15], and ERK1 phosphorylation of ZnT7 at T297 enhances Golgi zinc loading to drive MMP-mediated β-catenin oncogenic signaling [#23]. Compound heterozygous loss-of-function variants in SLC30A7 cause Ziegler-Huang Syndrome (bone marrow failure, growth retardation, testicular hypoplasia), associated with impaired AKT activation and elevated TP53 [#20, #22].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the core identity of ZnT7 by showing it resides in the Golgi and moves cytoplasmic zinc into the Golgi lumen, defining its directionality and compartment.\",\n      \"evidence\": \"Immunofluorescence and zinc accumulation assays in transfected CHO cells\",\n      \"pmids\": [\"12446736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transport mechanism and stoichiometry not defined\", \"No evidence of physiological substrate enzymes yet\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected ZnT7 transport activity to a functional output by demonstrating it loads zinc into secretory-pathway alkaline phosphatases, converting apo- to holo-enzyme.\",\n      \"evidence\": \"Gene disruption in DT40 cells with ALP activity assay and re-expression rescue\",\n      \"pmids\": [\"15525635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy with ZnT5 leaves individual contributions partly unresolved\", \"Other Golgi metalloenzyme clients not yet tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the systemic role of ZnT7 in dietary zinc absorption and whole-body zinc status using a knockout mouse, showing growth effects not rescuable by dietary zinc.\",\n      \"evidence\": \"Gene-trap knockout mouse with tissue/cell zinc measurements and radioactive zinc feeding\",\n      \"pmids\": [\"17954933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-autonomous versus systemic basis of growth defect unresolved\", \"Molecular link between Golgi zinc loading and absorption not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked ZnT7 to insulin biology by showing it raises insulin gene transcription through Mtf1 acting on metal-responsive elements, implicating zinc-driven gene regulation.\",\n      \"evidence\": \"Overexpression in RIN5mF cells with RT-PCR, metabolic labeling, and Mtf1/MRE binding analysis\",\n      \"pmids\": [\"20599947\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single overexpression system, no loss-of-function confirmation\", \"Direct demonstration of Golgi zinc gradient driving Mtf1 lacking\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended ZnT7 function to peripheral insulin action, showing skeletal-muscle ZnT7 supports the Insr/Irs2/Akt axis and glucose uptake.\",\n      \"evidence\": \"Znt7-KO mice with metabolic phenotyping plus gain-of-function in L6 muscle cells\",\n      \"pmids\": [\"22854958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic link between Golgi zinc and Akt signaling not defined\", \"Whether effect is direct or secondary to lipid changes unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved genetic redundancy in β-cell secretion by showing combined ZnT7/ZnT8 deletion abolishes glucose-stimulated insulin secretion while ZnT7 alone impairs glucose tolerance and islet composition.\",\n      \"evidence\": \"Single and double knockout mice with islet GSIS, insulin content, and morphology analysis\",\n      \"pmids\": [\"27754787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of ZnT7/ZnT8 functional overlap unclear\", \"Cause of altered α-to-β cell ratio not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the mechanism of muscle insulin resistance in ZnT7 loss as lipid-driven, linking zinc dyshomeostasis to fatty-acid accumulation and bioactive lipid mediators.\",\n      \"evidence\": \"znt7-KO mice with lipidomics, oxylipin profiling, EM, and molecular analysis\",\n      \"pmids\": [\"29555680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from Golgi zinc to lipid transporter upregulation unresolved\", \"Which zinc-dependent enzyme drives lipid phenotype unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Implicated ZnT7 in cytoprotection and disease signaling across tissues, modulating PI3K/Akt, MAPK/ERK, and TGF-β/Smad pathways in osteoblasts and renal cells.\",\n      \"evidence\": \"Reciprocal overexpression/knockdown with apoptosis and EMT readouts in MC3T3-E1, NRK-52E, and cardiomyocyte models\",\n      \"pmids\": [\"23403124\", \"29627824\", \"29307859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab cell-line studies, in vivo confirmation limited\", \"Direct molecular target connecting ZnT7 to these pathways not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified a physical interaction between ZnT7 and CD40, placing ZnT7 in immune receptor signaling in B cells.\",\n      \"evidence\": \"Immunoprecipitation with flow cytometry and p38 MAPK phosphorylation readouts under knockdown/overexpression\",\n      \"pmids\": [\"28469980\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal structural validation\", \"Mechanism by which ZnT7 controls CD40 surface expression unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided the structural mechanism, revealing ZnT7 as a homodimeric Zn2+/H+ antiporter with an alternating-access cycle and a histidine-rich loop that recruits zinc to the transport path.\",\n      \"evidence\": \"Cryo-EM structures at 2.2–3.1 Å in Zn2+-bound and unbound states\",\n      \"pmids\": [\"37553324\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Proton coupling stoichiometry not quantified\", \"Regulatory inputs onto the histidine-rich loop in vivo not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established the genetic link to human disease, identifying compound heterozygous loss-of-function SLC30A7 variants causing Ziegler-Huang Syndrome.\",\n      \"evidence\": \"Exome sequencing, RNA-seq splicing analysis, and patient-cell protein quantification\",\n      \"pmids\": [\"36821639\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family/lab, genotype-phenotype breadth unknown\", \"Mechanism connecting ZnT7 loss to bone marrow failure not yet defined here\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified Golgi α-mannosidase II as a ZnT7 client enzyme, mechanistically linking ZnT7 to N-glycan maturation with specificity confirmed against lysosomal mannosidase.\",\n      \"evidence\": \"Genetic disruption of ZNT5-6/ZNT7 with GMII activity assay, N-glycan profiling, and xenograft validation\",\n      \"pmids\": [\"38762179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of Golgi metalloenzyme clients incomplete\", \"Contribution of glycosylation defect to organismal phenotypes unquantified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected human ZnT7 loss to the AKT/TP53 axis and hematopoiesis, with wild-type rescue restoring insulin-stimulated AKT and KO mice modeling cytopenia.\",\n      \"evidence\": \"Patient-cell Western blots, wild-type ZNT7 transduction rescue, bone marrow lineage co-expression, and Znt7-KO hematology\",\n      \"pmids\": [\"40286389\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking Golgi zinc to TP53 elevation unresolved\", \"Single-lab model of bone marrow failure\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined a post-translational regulatory axis, showing ERK1 phosphorylates ZnT7 at T297 to enhance Golgi zinc loading and drive MMP/β-catenin oncogenic signaling.\",\n      \"evidence\": \"Mouse 4NQO tumorigenesis KO, phosphosite mapping, ZNG1 Co-IP, MMP and β-catenin pathway assays, PDX model\",\n      \"pmids\": [\"42190790\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, awaiting independent replication\", \"Direct structural basis of T297 phosphorylation effect on transport not shown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single Golgi zinc-loading transporter mechanistically dictates such diverse outcomes—glycosylation, insulin secretion, lipid metabolism, hematopoiesis, and oncogenic signaling—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking compartmental zinc gradients to downstream signaling pathways\", \"Tissue-specific client enzyme repertoires undefined\", \"In vivo significance of mitochondrial/SER ZnT7 pools relative to Golgi pool unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 18, 21]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [0, 18]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 3, 4, 15, 21]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [12, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 21]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 2, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8, 11, 23]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [9, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SLC30A5\", \"CD40\", \"ERK1\", \"ZNG1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}