{"gene":"SLC30A5","run_date":"2026-06-10T07:46:33","timeline":{"discoveries":[{"year":2002,"finding":"Znt5-knockout mice show impaired osteoblast maturation to osteocyte (osteopenia) and male-specific sudden cardiac death accompanied by bradyarrhythmias; cardiac gene-expression profiling revealed down-regulation of immediate-early response factors and heat shock proteins in null hearts, placing ZNT5 upstream of these transcriptional programs.","method":"Knockout mouse model, bone density measurement, oligonucleotide microarray gene-expression profiling","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotypes (osteopenia, cardiac arrhythmia) plus microarray mechanistic follow-up; replicated across multiple phenotypic readouts in one study","pmids":["12095919"],"is_preprint":false},{"year":2004,"finding":"ZnT5 (together with ZnT7) localizes to the secretory apparatus and is required for loading zinc onto GPI-anchored alkaline phosphatases (ALPs), converting apo-ALP to holo-ALP; disruption of ZnT5 alone reduced ALP activity to 45% of wild-type, and combined disruption of ZnT5 and ZnT7 reduced it to <5%, while overexpression of human ZnT5 in double-deficient DT40 cells rescued ALP activity.","method":"Gene disruption in DT40 cells, ALP activity assay, overexpression rescue, cellular fractionation/localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — enzymatic activity assay with gene KO and rescue by overexpression, multiple genetic combinations tested","pmids":["15525635"],"is_preprint":false},{"year":2007,"finding":"Two splice variants of ZnT5 adopt different subcellular localizations: one localizes to the Golgi apparatus and the other is distributed throughout the cell including the plasma membrane, when expressed as GFP fusions in CHO cells. The ZnT5 promoter is transcriptionally repressed by both high and low extracellular zinc; the zinc-responsive element maps to -154 to +50, not to the consensus MRE at -410. Additionally, zinc stabilizes ZnT5 mRNA (1.7–2-fold accumulation over 24 h in the presence of actinomycin D), opposing the transcriptional repression.","method":"GFP-fusion live imaging in CHO cells, beta-galactosidase reporter gene promoter deletion analysis, actinomycin D mRNA stability assay in Caco-2 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (localization imaging, reporter assay with deletion mapping, mRNA stability assay) in single lab","pmids":["17234632"],"is_preprint":false},{"year":2009,"finding":"ZnT5 and ZnT6 form heterodimers (not larger complexes) in the early secretory pathway; the cytosolic C-terminal tail of ZnT5 is required for specifying ZnT6 as its heterodimerization partner, while the long N-terminal half of ZnT5 is dispensable. Conserved hydrophilic residues in transmembrane domains II and V of ZnT6 are not involved in zinc binding of ZnT6 (unlike in homo-oligomeric CDF/ZnT members) but are required for zinc transport in homo-oligomers. A short ZnT5 variant lacking the N-terminal half is endogenously induced during ER stress in DT40 cells.","method":"Co-immunoprecipitation, mutagenesis of transmembrane residues, chimera studies in DT40 cells deficient in ZnT5/ZnT6/ZnT7","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal Co-IP plus mutagenesis plus chimera analysis in genetically defined cell system","pmids":["19759014"],"is_preprint":false},{"year":2009,"finding":"ZnT5 is required in mast cells for FcεRI-induced cytokine production and delayed-type allergic reactions but not for immediate-type (degranulation) responses. Mechanistically, ZnT5 mediates FcεRI-induced translocation of PKC to the plasma membrane and nuclear translocation of NF-κB; the zinc finger-like motif of PKC is required for plasma membrane translocation and diacylglycerol binding.","method":"Znt5-knockout mice, passive cutaneous anaphylaxis assay, contact hypersensitivity model, PKC translocation assay, NF-κB nuclear translocation assay, mutagenesis of PKC zinc finger motif","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with specific cellular phenotypes, PKC translocation assay, NF-κB localization, and PKC domain mutagenesis across multiple orthogonal methods","pmids":["19451265"],"is_preprint":false},{"year":2011,"finding":"Differential subcellular localization of ZnT5 splice variants (variant A to Golgi; variant B to ER) is dictated by their alternative C-terminal sequences: exons 15–17 (unique to variant A) contain a Golgi-targeting signal, while the 3' end of exon 14 (unique to variant B) contains an ER retention signal.","method":"N- and C-terminal GFP/FLAG fusion imaging in cells, splice variant-specific RT-PCR, deletion/chimera analysis identifying responsible exons","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct localization imaging with domain swapping, single lab, two orthogonal tagging strategies","pmids":["21887337"],"is_preprint":false},{"year":2014,"finding":"ZnT5 co-localizes with ER and Golgi (early secretory pathway) in rat pituitary GH3 cells; siRNA-mediated knockdown of ZnT5 significantly reduces growth hormone secretion. Altered ZnT5 expression (knockdown or overexpression) changes the cytoplasmic Zn2+ pool, indicating ZnT5 mediates zinc influx into secretory pathway compartments.","method":"Confocal microscopy co-localization, siRNA knockdown, Western blot for GH secretion, luciferase-based cytoplasmic Zn2+ pool assay","journal":"Hormone research in paediatrics","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — localization with functional consequence (GH secretion), zinc pool measurement, single lab with multiple methods","pmids":["25196974"],"is_preprint":false},{"year":2015,"finding":"Reduced SLC30A5 expression (reduced mRNA and protein) is associated with a maternal milk zinc deficiency disorder; altered DNA methylation at two CpG sites in the SLC30A5 promoter is detected in lymphoblasts from affected mothers and may account for reduced expression. Reduced SLC30A6 expression may be secondary to reduced SLC30A5, consistent with their functional heterodimer relationship.","method":"mRNA/protein quantification, DNA methylation analysis (bisulfite sequencing) of SLC30A5 promoter CpG sites, lymphoblast and fibroblast culture","journal":"Genes & nutrition","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlative methylation and expression data in patient-derived cells, no direct functional rescue experiment","pmids":["26319140"],"is_preprint":false},{"year":2024,"finding":"ZNT5-ZNT6 heterodimers (ZNT5-6) and ZNT7 homodimers supply Zn2+ to Golgi α-mannosidase II (GMII), a pivotal enzyme for conversion of hybrid- to complex-type N-glycans; loss of ZNT5-6 and ZNT7 function markedly reduces GMII activity and causes accumulation of hybrid-type glycans with reduction of complex-type glycans, while the homologous lysosomal mannosidase activity is unaffected.","method":"Gene disruption of ZNT5/ZNT6/ZNT7 in cell lines, GMII enzymatic activity assay, N-glycan profiling, xenograft tumor growth assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — enzymatic activity assay combined with genetic KO, glycan profiling, and specific controls (LAMAN activity unchanged), multiple orthogonal methods","pmids":["38762179"],"is_preprint":false},{"year":2024,"finding":"ZnT5 knockdown in breast cancer cells promotes cell migration, decreases E-cadherin expression and increases vimentin, slug, and MMP9 (EMT markers); antibody array showed ZnT5 knockdown increases SMAD1 expression, and dorsomorphin (SMAD1 pathway inhibitor) blocks the pro-migratory effect, placing ZnT5 upstream of SMAD1-mediated EMT.","method":"siRNA knockdown, wound healing assay, Western blot for EMT markers, antibody array, dorsomorphin pharmacological inhibition","journal":"International journal of experimental pathology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — loss-of-function with defined EMT phenotype plus pharmacological pathway validation, single lab","pmids":["39138630"],"is_preprint":false},{"year":2025,"finding":"A bi-allelic in-frame 3 bp deletion in SLC30A5 deleting an isoleucine within the conserved cation efflux domain of ZnT5 results in lower cytosolic zinc concentrations (measured in transfected HEK293 cells), causing a syndrome of severe neonatal hypotonia with respiratory failure; this establishes that the conserved cation efflux domain is functionally required for ZnT5-mediated zinc transport.","method":"Homozygosity mapping, exome sequencing, transfection of variant into HEK293 cells with cytosolic zinc monitoring","journal":"JIMD reports","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional zinc transport assay in transfected cells with disease variant, single lab, no mutagenesis panel","pmids":["39790720"],"is_preprint":false},{"year":2026,"finding":"SLC30A5 (along with SLC30A1 and SLC30A9) regulates the PTP/AKT/ESR1 signaling pathway in ER-positive breast cancer cells; zinc-dependent inhibition of PTP phosphatases by SLC30A5-mediated zinc transport modulates AKT kinase signaling, contributing to hormone-independent ESR1 activation. ESR1 was found to directly repress SLC30 transcription, forming a regulatory feedback loop.","method":"Bioinformatic and experimental analyses in ER+ breast cancer cells (specific method details not stated in abstract)","journal":"Metallomics : integrated biometal science","confidence":"Low","confidence_rationale":"Tier 3-4 / Weak — abstract does not specify methods clearly; combined bioinformatic and experimental but no detail on assay type; single lab, no replication","pmids":["41790496"],"is_preprint":false}],"current_model":"SLC30A5/ZnT5 is a zinc transporter that resides in the early secretory pathway (ER and Golgi), where it forms obligate heterodimers with ZnT6 to supply Zn2+ to zinc-requiring enzymes including alkaline phosphatases and Golgi α-mannosidase II (enabling N-glycosylation), regulates GH secretion, and controls cytoplasmic zinc pools; in immune cells it facilitates PKC membrane translocation and NF-κB nuclear translocation downstream of FcεRI, selectively enabling delayed-type but not immediate-type allergic responses, while in vivo loss of function causes osteopenia, male-specific cardiac arrhythmia/sudden death, and severe neonatal hypotonia."},"narrative":{"mechanistic_narrative":"SLC30A5 (ZnT5) is a zinc transporter of the early secretory pathway that supplies Zn2+ to zinc-requiring enzymes and thereby controls secretory-pathway and immune functions [PMID:15525635, PMID:38762179]. ZnT5 forms obligate heterodimers with ZnT6, with specificity determined by the cytosolic C-terminal tail of ZnT5, and this ZnT5-ZnT6 unit—redundantly with ZnT7—loads zinc onto GPI-anchored alkaline phosphatases to convert apo- to holo-enzyme and onto Golgi α-mannosidase II, which is required for conversion of hybrid- to complex-type N-glycans [PMID:15525635, PMID:19759014, PMID:38762179]. Its conserved cation efflux domain is required for transport activity, and it localizes to ER versus Golgi according to alternative C-terminal splice variants carrying distinct ER-retention and Golgi-targeting signals [PMID:21887337, PMID:39790720]. Beyond enzyme metalation, ZnT5 controls cytoplasmic zinc pools and supports growth hormone secretion [PMID:25196974], and in mast cells it mediates FcεRI-induced PKC translocation to the plasma membrane and NF-κB nuclear translocation, selectively enabling delayed-type but not immediate-type allergic responses [PMID:19451265]. In vivo loss of ZnT5 causes osteopenia from impaired osteoblast-to-osteocyte maturation and male-specific bradyarrhythmia and sudden cardiac death [PMID:12095919]. A bi-allelic in-frame deletion in the cation efflux domain lowers cytosolic zinc and causes a syndrome of severe neonatal hypotonia with respiratory failure [PMID:39790720].","teleology":[{"year":2002,"claim":"Establishing that ZnT5 has non-redundant physiological roles, knockout mice revealed defined organ-level phenotypes and placed the transporter upstream of cardiac transcriptional programs.","evidence":"Znt5-knockout mice with bone density measurement and cardiac gene-expression microarray profiling","pmids":["12095919"],"confidence":"High","gaps":["Molecular link between zinc transport and immediate-early/heat-shock gene downregulation not defined","Basis for male-specific cardiac phenotype unexplained"]},{"year":2004,"claim":"To define a molecular function, gene disruption showed ZnT5 (with ZnT7) is required to metalate alkaline phosphatases, identifying enzyme activation in the secretory pathway as its biochemical role.","evidence":"Gene disruption in DT40 cells with ALP activity assay and overexpression rescue","pmids":["15525635"],"confidence":"High","gaps":["Did not resolve oligomeric state of the functional transporter","Direction and energetics of zinc transport not measured"]},{"year":2007,"claim":"Addressing how ZnT5 expression and localization are controlled, splice variants were shown to differ in localization and the gene's transcription to be repressed by both high and low zinc with opposing mRNA stabilization.","evidence":"GFP-fusion imaging in CHO cells, promoter-deletion reporter assays, and actinomycin D mRNA stability assays","pmids":["17234632"],"confidence":"High","gaps":["Trans-acting factors binding the -154/+50 zinc-responsive element not identified","Mechanism of zinc-dependent mRNA stabilization unknown"]},{"year":2009,"claim":"Resolving the functional unit, reciprocal Co-IP and chimera analysis established ZnT5-ZnT6 as obligate heterodimers and mapped the ZnT5 C-terminal tail as the determinant of partner specificity.","evidence":"Co-immunoprecipitation, transmembrane-residue mutagenesis, and chimera studies in DT40 cells deficient in ZnT5/6/7","pmids":["19759014"],"confidence":"High","gaps":["Stoichiometry and structure of the heterodimer not solved","How the heterodimer coordinates zinc differently from ZnT homo-oligomers not fully defined"]},{"year":2009,"claim":"Extending function to immune signaling, knockout and translocation assays showed ZnT5 is required for FcεRI-driven PKC and NF-κB translocation and selectively for delayed-type allergy.","evidence":"Znt5-knockout mice, anaphylaxis and contact hypersensitivity models, PKC/NF-κB translocation assays, PKC zinc-finger mutagenesis","pmids":["19451265"],"confidence":"High","gaps":["Subcellular site where ZnT5-supplied zinc acts on PKC not pinpointed","Why immediate-type degranulation is spared not explained"]},{"year":2011,"claim":"To explain variant localization, domain swapping identified specific exon-encoded C-terminal Golgi-targeting and ER-retention signals dictating ER versus Golgi residence.","evidence":"N-/C-terminal GFP/FLAG fusion imaging and deletion/chimera analysis of splice variants","pmids":["21887337"],"confidence":"Medium","gaps":["Functional consequences of differential ER vs Golgi localization not tested","Single-lab imaging without orthogonal endogenous validation"]},{"year":2014,"claim":"Linking ZnT5 to endocrine secretion, knockdown reduced growth hormone release and altered the cytoplasmic zinc pool, implicating ZnT5 in zinc influx into secretory compartments.","evidence":"Confocal co-localization, siRNA knockdown, GH secretion Western blot, luciferase cytoplasmic Zn2+ reporter in GH3 cells","pmids":["25196974"],"confidence":"Medium","gaps":["Direct mechanism connecting zinc transport to GH secretion not established","Single cell-line system"]},{"year":2015,"claim":"Probing human disease relevance, reduced SLC30A5 expression with promoter CpG hypermethylation was associated with a maternal milk zinc deficiency disorder.","evidence":"mRNA/protein quantification and bisulfite sequencing of SLC30A5 promoter in patient-derived lymphoblasts/fibroblasts","pmids":["26319140"],"confidence":"Low","gaps":["Correlative without functional rescue demonstrating causality","Methylation-to-phenotype causal chain not established"]},{"year":2024,"claim":"Defining a glycosylation function, KO and glycan profiling showed ZnT5-6 and ZnT7 supply zinc to Golgi α-mannosidase II, controlling hybrid- to complex-type N-glycan conversion.","evidence":"Gene disruption of ZNT5/6/7, GMII enzymatic assay, N-glycan profiling with LAMAN control, xenograft assay","pmids":["38762179"],"confidence":"High","gaps":["Full repertoire of zinc-dependent secretory enzymes served by ZnT5 not enumerated","Tumor-growth mechanism downstream of glycan changes not dissected"]},{"year":2024,"claim":"Implicating ZnT5 in cancer cell behavior, knockdown promoted migration and EMT via a SMAD1-dependent route blocked by dorsomorphin.","evidence":"siRNA knockdown, wound-healing assay, EMT-marker Westerns, antibody array, dorsomorphin inhibition in breast cancer cells","pmids":["39138630"],"confidence":"Medium","gaps":["How zinc transport mechanistically alters SMAD1 not defined","Single-lab in vitro only"]},{"year":2025,"claim":"Confirming the catalytic core, a bi-allelic in-frame deletion in the conserved cation efflux domain lowered cytosolic zinc and caused severe neonatal hypotonia, tying domain function to human disease.","evidence":"Homozygosity mapping, exome sequencing, and variant transfection into HEK293 cells with cytosolic zinc monitoring","pmids":["39790720"],"confidence":"Medium","gaps":["Single variant without broader mutagenesis panel","Tissue basis of neonatal hypotonia phenotype not established"]},{"year":2026,"claim":"Extending to oncogenic signaling, SLC30A5-mediated zinc transport was linked to PTP/AKT/ESR1 signaling with an ESR1-driven transcriptional feedback loop in ER+ breast cancer.","evidence":"Combined bioinformatic and experimental analyses in ER+ breast cancer cells (methods not detailed in abstract)","pmids":["41790496"],"confidence":"Low","gaps":["Assay details and direct zinc-PTP-AKT link not specified","No replication or in vivo validation"]},{"year":null,"claim":"How zinc supply through ZnT5-ZnT6 is mechanistically coupled to its diverse downstream outputs—cardiac transcription, PKC/NF-κB signaling, GH secretion, and EMT—remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of the ZnT5-ZnT6 transporter","Full substrate enzyme set incompletely defined","Mechanistic links to signaling pathways largely correlative"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[1,6,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,8]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,5,6]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[2,5,6,8]}],"pathway":[],"complexes":["ZnT5-ZnT6 heterodimer"],"partners":["SLC30A6","SLC30A7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TAD4","full_name":"Proton-coupled zinc antiporter SLC30A5","aliases":["Solute carrier family 30 member 5","Zinc transporter 5","ZnT-5","ZnT-like transporter 1","hZTL1"],"length_aa":765,"mass_kda":84.0,"function":"Together with SLC30A6 forms a functional proton-coupled zinc ion antiporter mediating zinc entry into the lumen of organelles along the secretory pathway (PubMed:11904301, PubMed:15525635, PubMed:15994300, PubMed:19366695, PubMed:22529353). By contributing to zinc ion homeostasis within the early secretory pathway, regulates the activation and folding of enzymes like alkaline phosphatases and enzymes involved in phosphatidylinositol glycan anchor biosynthesis (PubMed:15525635, PubMed:15994300, PubMed:16636052, PubMed:35525268). Through the transport of zinc into secretory granules of pancreatic beta-cells, plays an important role in the storage and secretion of insulin (PubMed:11904301) Zinc ion:proton antiporter mediating influx and efflux of zinc at the plasma membrane","subcellular_location":"Endoplasmic reticulum membrane; Cell membrane; Apical cell membrane","url":"https://www.uniprot.org/uniprotkb/Q8TAD4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC30A5","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000145740","cell_line_id":"CID001329","localizations":[{"compartment":"golgi","grade":3}],"interactors":[{"gene":"GORASP2","stoichiometry":0.2},{"gene":"RAB1A","stoichiometry":0.2},{"gene":"SLC30A6","stoichiometry":0.2},{"gene":"NUCKS1","stoichiometry":0.2},{"gene":"SCIN","stoichiometry":0.2},{"gene":"TMED10","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001329","total_profiled":1310},"omim":[{"mim_id":"616290","title":"ZINC FINGER PROTEIN 658; ZNF658","url":"https://www.omim.org/entry/616290"},{"mim_id":"610153","title":"DEAFNESS, AUTOSOMAL RECESSIVE 49; DFNB49","url":"https://www.omim.org/entry/610153"},{"mim_id":"607819","title":"SOLUTE CARRIER FAMILY 30 (ZINC TRANSPORTER), MEMBER 5; SLC30A5","url":"https://www.omim.org/entry/607819"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SLC30A5"},"hgnc":{"alias_symbol":["ZTL1","ZnT-5","FLJ12496","FLJ12756","ZNT5","MGC5499","ZNTL1"],"prev_symbol":[]},"alphafold":{"accession":"Q8TAD4","domains":[{"cath_id":"-","chopping":"28-174_196-327_345-364","consensus_level":"high","plddt":87.3072,"start":28,"end":364},{"cath_id":"1.20.1510.10","chopping":"400-544_586-650","consensus_level":"high","plddt":85.6339,"start":400,"end":650},{"cath_id":"3.30.70.1350","chopping":"656-755","consensus_level":"high","plddt":81.1922,"start":656,"end":755}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TAD4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TAD4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TAD4-F1-predicted_aligned_error_v6.png","plddt_mean":76.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC30A5","jax_strain_url":"https://www.jax.org/strain/search?query=SLC30A5"},"sequence":{"accession":"Q8TAD4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TAD4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TAD4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TAD4"}},"corpus_meta":[{"pmid":"12095919","id":"PMC_12095919","title":"Osteopenia and male-specific sudden cardiac death in mice lacking a zinc transporter gene, Znt5.","date":"2002","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12095919","citation_count":138,"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":"19759014","id":"PMC_19759014","title":"Demonstration and characterization of the heterodimerization of ZnT5 and ZnT6 in the early secretory pathway.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19759014","citation_count":91,"is_preprint":false},{"pmid":"19451265","id":"PMC_19451265","title":"Zinc transporter Znt5/Slc30a5 is required for the mast cell-mediated delayed-type allergic reaction but not the immediate-type reaction.","date":"2009","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19451265","citation_count":87,"is_preprint":false},{"pmid":"17234632","id":"PMC_17234632","title":"Splice variants of the human zinc transporter ZnT5 (SLC30A5) are differentially localized and regulated by zinc through transcription and mRNA stability.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17234632","citation_count":81,"is_preprint":false},{"pmid":"19245740","id":"PMC_19245740","title":"Does promoter methylation of the SLC30A5 (ZnT5) zinc transporter gene contribute to the ageing-related decline in zinc status?","date":"2009","source":"The Proceedings of the Nutrition Society","url":"https://pubmed.ncbi.nlm.nih.gov/19245740","citation_count":19,"is_preprint":false},{"pmid":"21887337","id":"PMC_21887337","title":"Differential subcellular localization of the splice variants of the zinc transporter ZnT5 is dictated by the different C-terminal regions.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21887337","citation_count":19,"is_preprint":false},{"pmid":"26319140","id":"PMC_26319140","title":"Altered expression of two zinc transporters, SLC30A5 and SLC30A6, underlies a mammary gland disorder of reduced zinc secretion into milk.","date":"2015","source":"Genes & nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/26319140","citation_count":16,"is_preprint":false},{"pmid":"33547425","id":"PMC_33547425","title":"Bi-allelic loss of function variants in SLC30A5 as cause of perinatal lethal cardiomyopathy.","date":"2021","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/33547425","citation_count":11,"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":"38740364","id":"PMC_38740364","title":"Transcriptional regulation of Znt family members znt4, znt5 and znt10 and their function in zinc transport in yellow catfish (Pelteobagrus fulvidraco).","date":"2024","source":"Biochimica et biophysica acta. Gene regulatory mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/38740364","citation_count":4,"is_preprint":false},{"pmid":"25196974","id":"PMC_25196974","title":"Alteration of ZnT5-mediated zinc import into the early secretory pathway affects the secretion of growth hormone from rat pituitary cells.","date":"2014","source":"Hormone research in paediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/25196974","citation_count":4,"is_preprint":false},{"pmid":"39138630","id":"PMC_39138630","title":"Zinc transporter ZnT5 is associated with epithelial mesenchymal transition via SMAD1 in breast cancer.","date":"2024","source":"International journal of experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/39138630","citation_count":3,"is_preprint":false},{"pmid":"39790720","id":"PMC_39790720","title":"Severe neonatal hypotonia due to SLC30A5 variant affecting function of ZnT5 zinc transporter.","date":"2025","source":"JIMD reports","url":"https://pubmed.ncbi.nlm.nih.gov/39790720","citation_count":2,"is_preprint":false},{"pmid":"40541873","id":"PMC_40541873","title":"F-box ubiquitin-ligating enzyme ZEITLUPE 1 inhibits the promotion of caffeic acid O-methyltransferase 1 in salt tolerance of apple by the multimeric E3 protein complex SCFZTL1-mediated ubiquitination modification and protein degradation.","date":"2025","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/40541873","citation_count":1,"is_preprint":false},{"pmid":"41790496","id":"PMC_41790496","title":"SLC30A1, SLC30A5, and SLC30A9 transporters play crucial role in ligand-independent activation of ESR1 signalling in breast cancer cells via modulation of AKT activity by zinc.","date":"2026","source":"Metallomics : integrated biometal science","url":"https://pubmed.ncbi.nlm.nih.gov/41790496","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10014,"output_tokens":3376,"usd":0.040341,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10994,"output_tokens":3816,"usd":0.075185,"stage2_stop_reason":"end_turn"},"total_usd":0.115526,"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\": \"Znt5-knockout mice show impaired osteoblast maturation to osteocyte (osteopenia) and male-specific sudden cardiac death accompanied by bradyarrhythmias; cardiac gene-expression profiling revealed down-regulation of immediate-early response factors and heat shock proteins in null hearts, placing ZNT5 upstream of these transcriptional programs.\",\n      \"method\": \"Knockout mouse model, bone density measurement, oligonucleotide microarray gene-expression profiling\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotypes (osteopenia, cardiac arrhythmia) plus microarray mechanistic follow-up; replicated across multiple phenotypic readouts in one study\",\n      \"pmids\": [\"12095919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ZnT5 (together with ZnT7) localizes to the secretory apparatus and is required for loading zinc onto GPI-anchored alkaline phosphatases (ALPs), converting apo-ALP to holo-ALP; disruption of ZnT5 alone reduced ALP activity to 45% of wild-type, and combined disruption of ZnT5 and ZnT7 reduced it to <5%, while overexpression of human ZnT5 in double-deficient DT40 cells rescued ALP activity.\",\n      \"method\": \"Gene disruption in DT40 cells, ALP activity assay, overexpression rescue, cellular fractionation/localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — enzymatic activity assay with gene KO and rescue by overexpression, multiple genetic combinations tested\",\n      \"pmids\": [\"15525635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Two splice variants of ZnT5 adopt different subcellular localizations: one localizes to the Golgi apparatus and the other is distributed throughout the cell including the plasma membrane, when expressed as GFP fusions in CHO cells. The ZnT5 promoter is transcriptionally repressed by both high and low extracellular zinc; the zinc-responsive element maps to -154 to +50, not to the consensus MRE at -410. Additionally, zinc stabilizes ZnT5 mRNA (1.7–2-fold accumulation over 24 h in the presence of actinomycin D), opposing the transcriptional repression.\",\n      \"method\": \"GFP-fusion live imaging in CHO cells, beta-galactosidase reporter gene promoter deletion analysis, actinomycin D mRNA stability assay in Caco-2 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (localization imaging, reporter assay with deletion mapping, mRNA stability assay) in single lab\",\n      \"pmids\": [\"17234632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZnT5 and ZnT6 form heterodimers (not larger complexes) in the early secretory pathway; the cytosolic C-terminal tail of ZnT5 is required for specifying ZnT6 as its heterodimerization partner, while the long N-terminal half of ZnT5 is dispensable. Conserved hydrophilic residues in transmembrane domains II and V of ZnT6 are not involved in zinc binding of ZnT6 (unlike in homo-oligomeric CDF/ZnT members) but are required for zinc transport in homo-oligomers. A short ZnT5 variant lacking the N-terminal half is endogenously induced during ER stress in DT40 cells.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis of transmembrane residues, chimera studies in DT40 cells deficient in ZnT5/ZnT6/ZnT7\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal Co-IP plus mutagenesis plus chimera analysis in genetically defined cell system\",\n      \"pmids\": [\"19759014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZnT5 is required in mast cells for FcεRI-induced cytokine production and delayed-type allergic reactions but not for immediate-type (degranulation) responses. Mechanistically, ZnT5 mediates FcεRI-induced translocation of PKC to the plasma membrane and nuclear translocation of NF-κB; the zinc finger-like motif of PKC is required for plasma membrane translocation and diacylglycerol binding.\",\n      \"method\": \"Znt5-knockout mice, passive cutaneous anaphylaxis assay, contact hypersensitivity model, PKC translocation assay, NF-κB nuclear translocation assay, mutagenesis of PKC zinc finger motif\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with specific cellular phenotypes, PKC translocation assay, NF-κB localization, and PKC domain mutagenesis across multiple orthogonal methods\",\n      \"pmids\": [\"19451265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Differential subcellular localization of ZnT5 splice variants (variant A to Golgi; variant B to ER) is dictated by their alternative C-terminal sequences: exons 15–17 (unique to variant A) contain a Golgi-targeting signal, while the 3' end of exon 14 (unique to variant B) contains an ER retention signal.\",\n      \"method\": \"N- and C-terminal GFP/FLAG fusion imaging in cells, splice variant-specific RT-PCR, deletion/chimera analysis identifying responsible exons\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct localization imaging with domain swapping, single lab, two orthogonal tagging strategies\",\n      \"pmids\": [\"21887337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ZnT5 co-localizes with ER and Golgi (early secretory pathway) in rat pituitary GH3 cells; siRNA-mediated knockdown of ZnT5 significantly reduces growth hormone secretion. Altered ZnT5 expression (knockdown or overexpression) changes the cytoplasmic Zn2+ pool, indicating ZnT5 mediates zinc influx into secretory pathway compartments.\",\n      \"method\": \"Confocal microscopy co-localization, siRNA knockdown, Western blot for GH secretion, luciferase-based cytoplasmic Zn2+ pool assay\",\n      \"journal\": \"Hormone research in paediatrics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — localization with functional consequence (GH secretion), zinc pool measurement, single lab with multiple methods\",\n      \"pmids\": [\"25196974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Reduced SLC30A5 expression (reduced mRNA and protein) is associated with a maternal milk zinc deficiency disorder; altered DNA methylation at two CpG sites in the SLC30A5 promoter is detected in lymphoblasts from affected mothers and may account for reduced expression. Reduced SLC30A6 expression may be secondary to reduced SLC30A5, consistent with their functional heterodimer relationship.\",\n      \"method\": \"mRNA/protein quantification, DNA methylation analysis (bisulfite sequencing) of SLC30A5 promoter CpG sites, lymphoblast and fibroblast culture\",\n      \"journal\": \"Genes & nutrition\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlative methylation and expression data in patient-derived cells, no direct functional rescue experiment\",\n      \"pmids\": [\"26319140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZNT5-ZNT6 heterodimers (ZNT5-6) and ZNT7 homodimers supply Zn2+ to Golgi α-mannosidase II (GMII), a pivotal enzyme for conversion of hybrid- to complex-type N-glycans; loss of ZNT5-6 and ZNT7 function markedly reduces GMII activity and causes accumulation of hybrid-type glycans with reduction of complex-type glycans, while the homologous lysosomal mannosidase activity is unaffected.\",\n      \"method\": \"Gene disruption of ZNT5/ZNT6/ZNT7 in cell lines, GMII enzymatic activity assay, N-glycan profiling, xenograft tumor growth assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — enzymatic activity assay combined with genetic KO, glycan profiling, and specific controls (LAMAN activity unchanged), multiple orthogonal methods\",\n      \"pmids\": [\"38762179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZnT5 knockdown in breast cancer cells promotes cell migration, decreases E-cadherin expression and increases vimentin, slug, and MMP9 (EMT markers); antibody array showed ZnT5 knockdown increases SMAD1 expression, and dorsomorphin (SMAD1 pathway inhibitor) blocks the pro-migratory effect, placing ZnT5 upstream of SMAD1-mediated EMT.\",\n      \"method\": \"siRNA knockdown, wound healing assay, Western blot for EMT markers, antibody array, dorsomorphin pharmacological inhibition\",\n      \"journal\": \"International journal of experimental pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — loss-of-function with defined EMT phenotype plus pharmacological pathway validation, single lab\",\n      \"pmids\": [\"39138630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A bi-allelic in-frame 3 bp deletion in SLC30A5 deleting an isoleucine within the conserved cation efflux domain of ZnT5 results in lower cytosolic zinc concentrations (measured in transfected HEK293 cells), causing a syndrome of severe neonatal hypotonia with respiratory failure; this establishes that the conserved cation efflux domain is functionally required for ZnT5-mediated zinc transport.\",\n      \"method\": \"Homozygosity mapping, exome sequencing, transfection of variant into HEK293 cells with cytosolic zinc monitoring\",\n      \"journal\": \"JIMD reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional zinc transport assay in transfected cells with disease variant, single lab, no mutagenesis panel\",\n      \"pmids\": [\"39790720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SLC30A5 (along with SLC30A1 and SLC30A9) regulates the PTP/AKT/ESR1 signaling pathway in ER-positive breast cancer cells; zinc-dependent inhibition of PTP phosphatases by SLC30A5-mediated zinc transport modulates AKT kinase signaling, contributing to hormone-independent ESR1 activation. ESR1 was found to directly repress SLC30 transcription, forming a regulatory feedback loop.\",\n      \"method\": \"Bioinformatic and experimental analyses in ER+ breast cancer cells (specific method details not stated in abstract)\",\n      \"journal\": \"Metallomics : integrated biometal science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 / Weak — abstract does not specify methods clearly; combined bioinformatic and experimental but no detail on assay type; single lab, no replication\",\n      \"pmids\": [\"41790496\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC30A5/ZnT5 is a zinc transporter that resides in the early secretory pathway (ER and Golgi), where it forms obligate heterodimers with ZnT6 to supply Zn2+ to zinc-requiring enzymes including alkaline phosphatases and Golgi α-mannosidase II (enabling N-glycosylation), regulates GH secretion, and controls cytoplasmic zinc pools; in immune cells it facilitates PKC membrane translocation and NF-κB nuclear translocation downstream of FcεRI, selectively enabling delayed-type but not immediate-type allergic responses, while in vivo loss of function causes osteopenia, male-specific cardiac arrhythmia/sudden death, and severe neonatal hypotonia.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLC30A5 (ZnT5) is a zinc transporter of the early secretory pathway that supplies Zn2+ to zinc-requiring enzymes and thereby controls secretory-pathway and immune functions [#1, #8]. ZnT5 forms obligate heterodimers with ZnT6, with specificity determined by the cytosolic C-terminal tail of ZnT5, and this ZnT5-ZnT6 unit—redundantly with ZnT7—loads zinc onto GPI-anchored alkaline phosphatases to convert apo- to holo-enzyme and onto Golgi α-mannosidase II, which is required for conversion of hybrid- to complex-type N-glycans [#1, #3, #8]. Its conserved cation efflux domain is required for transport activity, and it localizes to ER versus Golgi according to alternative C-terminal splice variants carrying distinct ER-retention and Golgi-targeting signals [#5, #10]. Beyond enzyme metalation, ZnT5 controls cytoplasmic zinc pools and supports growth hormone secretion [#6], and in mast cells it mediates FcεRI-induced PKC translocation to the plasma membrane and NF-κB nuclear translocation, selectively enabling delayed-type but not immediate-type allergic responses [#4]. In vivo loss of ZnT5 causes osteopenia from impaired osteoblast-to-osteocyte maturation and male-specific bradyarrhythmia and sudden cardiac death [#0]. A bi-allelic in-frame deletion in the cation efflux domain lowers cytosolic zinc and causes a syndrome of severe neonatal hypotonia with respiratory failure [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that ZnT5 has non-redundant physiological roles, knockout mice revealed defined organ-level phenotypes and placed the transporter upstream of cardiac transcriptional programs.\",\n      \"evidence\": \"Znt5-knockout mice with bone density measurement and cardiac gene-expression microarray profiling\",\n      \"pmids\": [\"12095919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between zinc transport and immediate-early/heat-shock gene downregulation not defined\", \"Basis for male-specific cardiac phenotype unexplained\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"To define a molecular function, gene disruption showed ZnT5 (with ZnT7) is required to metalate alkaline phosphatases, identifying enzyme activation in the secretory pathway as its biochemical role.\",\n      \"evidence\": \"Gene disruption in DT40 cells with ALP activity assay and overexpression rescue\",\n      \"pmids\": [\"15525635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve oligomeric state of the functional transporter\", \"Direction and energetics of zinc transport not measured\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Addressing how ZnT5 expression and localization are controlled, splice variants were shown to differ in localization and the gene's transcription to be repressed by both high and low zinc with opposing mRNA stabilization.\",\n      \"evidence\": \"GFP-fusion imaging in CHO cells, promoter-deletion reporter assays, and actinomycin D mRNA stability assays\",\n      \"pmids\": [\"17234632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trans-acting factors binding the -154/+50 zinc-responsive element not identified\", \"Mechanism of zinc-dependent mRNA stabilization unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolving the functional unit, reciprocal Co-IP and chimera analysis established ZnT5-ZnT6 as obligate heterodimers and mapped the ZnT5 C-terminal tail as the determinant of partner specificity.\",\n      \"evidence\": \"Co-immunoprecipitation, transmembrane-residue mutagenesis, and chimera studies in DT40 cells deficient in ZnT5/6/7\",\n      \"pmids\": [\"19759014\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of the heterodimer not solved\", \"How the heterodimer coordinates zinc differently from ZnT homo-oligomers not fully defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extending function to immune signaling, knockout and translocation assays showed ZnT5 is required for FcεRI-driven PKC and NF-κB translocation and selectively for delayed-type allergy.\",\n      \"evidence\": \"Znt5-knockout mice, anaphylaxis and contact hypersensitivity models, PKC/NF-κB translocation assays, PKC zinc-finger mutagenesis\",\n      \"pmids\": [\"19451265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular site where ZnT5-supplied zinc acts on PKC not pinpointed\", \"Why immediate-type degranulation is spared not explained\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"To explain variant localization, domain swapping identified specific exon-encoded C-terminal Golgi-targeting and ER-retention signals dictating ER versus Golgi residence.\",\n      \"evidence\": \"N-/C-terminal GFP/FLAG fusion imaging and deletion/chimera analysis of splice variants\",\n      \"pmids\": [\"21887337\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of differential ER vs Golgi localization not tested\", \"Single-lab imaging without orthogonal endogenous validation\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linking ZnT5 to endocrine secretion, knockdown reduced growth hormone release and altered the cytoplasmic zinc pool, implicating ZnT5 in zinc influx into secretory compartments.\",\n      \"evidence\": \"Confocal co-localization, siRNA knockdown, GH secretion Western blot, luciferase cytoplasmic Zn2+ reporter in GH3 cells\",\n      \"pmids\": [\"25196974\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism connecting zinc transport to GH secretion not established\", \"Single cell-line system\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Probing human disease relevance, reduced SLC30A5 expression with promoter CpG hypermethylation was associated with a maternal milk zinc deficiency disorder.\",\n      \"evidence\": \"mRNA/protein quantification and bisulfite sequencing of SLC30A5 promoter in patient-derived lymphoblasts/fibroblasts\",\n      \"pmids\": [\"26319140\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Correlative without functional rescue demonstrating causality\", \"Methylation-to-phenotype causal chain not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defining a glycosylation function, KO and glycan profiling showed ZnT5-6 and ZnT7 supply zinc to Golgi α-mannosidase II, controlling hybrid- to complex-type N-glycan conversion.\",\n      \"evidence\": \"Gene disruption of ZNT5/6/7, GMII enzymatic assay, N-glycan profiling with LAMAN control, xenograft assay\",\n      \"pmids\": [\"38762179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of zinc-dependent secretory enzymes served by ZnT5 not enumerated\", \"Tumor-growth mechanism downstream of glycan changes not dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Implicating ZnT5 in cancer cell behavior, knockdown promoted migration and EMT via a SMAD1-dependent route blocked by dorsomorphin.\",\n      \"evidence\": \"siRNA knockdown, wound-healing assay, EMT-marker Westerns, antibody array, dorsomorphin inhibition in breast cancer cells\",\n      \"pmids\": [\"39138630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How zinc transport mechanistically alters SMAD1 not defined\", \"Single-lab in vitro only\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Confirming the catalytic core, a bi-allelic in-frame deletion in the conserved cation efflux domain lowered cytosolic zinc and caused severe neonatal hypotonia, tying domain function to human disease.\",\n      \"evidence\": \"Homozygosity mapping, exome sequencing, and variant transfection into HEK293 cells with cytosolic zinc monitoring\",\n      \"pmids\": [\"39790720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single variant without broader mutagenesis panel\", \"Tissue basis of neonatal hypotonia phenotype not established\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extending to oncogenic signaling, SLC30A5-mediated zinc transport was linked to PTP/AKT/ESR1 signaling with an ESR1-driven transcriptional feedback loop in ER+ breast cancer.\",\n      \"evidence\": \"Combined bioinformatic and experimental analyses in ER+ breast cancer cells (methods not detailed in abstract)\",\n      \"pmids\": [\"41790496\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Assay details and direct zinc-PTP-AKT link not specified\", \"No replication or in vivo validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How zinc supply through ZnT5-ZnT6 is mechanistically coupled to its diverse downstream outputs—cardiac transcription, PKC/NF-κB signaling, GH secretion, and EMT—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the ZnT5-ZnT6 transporter\", \"Full substrate enzyme set incompletely defined\", \"Mechanistic links to signaling pathways largely correlative\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [1, 6, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 5, 6]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [2, 5, 6, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [\"ZnT5-ZnT6 heterodimer\"],\n    \"partners\": [\"SLC30A6\", \"SLC30A7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}