{"gene":"BNC1","run_date":"2026-06-09T22:02:45","timeline":{"discoveries":[{"year":2000,"finding":"BNC1 (brain Na+ channel 1) is required for normal low-threshold rapidly adapting mechanosensation; BNC1-null mice show markedly reduced sensitivity of rapidly adapting mechanoreceptors in hairy skin. BNC1 protein was localized to lanceolate nerve endings surrounding hair follicles by direct immunolocalization. Acid-evoked currents in sensory neurons and acid-stimulated nociceptor responses were normal in BNC1-null mice (negative result for pH-sensing role).","method":"Gene knockout (BNC1-null mice), electrophysiology of mechanoreceptors, immunolocalization of channel protein in nerve endings","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined electrophysiological phenotype plus direct localization experiment, published in high-impact journal","pmids":["11069180"],"is_preprint":false},{"year":1999,"finding":"BNC1 channel pore structure probed by TEA block: external TEA blocks activated BNC1 (Gly430Val/Thr mutants) in a steeply voltage-dependent manner consistent with multi-ion block within the pore. Mutation Gly430Phe introduced a new TEA binding site ~30% across the electric field, providing structural insight into the channel pore.","method":"Electrophysiology (patch clamp) with site-directed mutagenesis of pore-lining residue Gly430; quaternary ammonium blockers of varying size","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro electrophysiology combined with active-site mutagenesis, single lab but two orthogonal approaches (mutagenesis + size-dependent block)","pmids":["10049320"],"is_preprint":false},{"year":2002,"finding":"BNC1 interacts with the PDZ-domain protein PICK1 via its C-terminus. Yeast two-hybrid and mammalian cell co-expression experiments showed that deletion of the BNC1 C-terminus or mutation of the PICK1 PDZ domain abolished the interaction. Co-expression of PICK1 altered the subcellular distribution of BNC1 channels in a PDZ-domain- and BNC1 C-terminus-dependent manner.","method":"Yeast two-hybrid assay, co-expression in mammalian cells, C-terminal deletion mutants, PDZ-domain point mutants, subcellular distribution imaging","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal yeast two-hybrid plus mammalian cell functional redistribution assay, two orthogonal methods, single lab","pmids":["11802773"],"is_preprint":false},{"year":2011,"finding":"BNC1 (Basonuclin 1) is a direct transcriptional target of p63. Chromatin immunoprecipitation and reporter assays demonstrated that p63 directly binds the BNC1 promoter and induces BNC1 expression, linking p63 to regulation of ribosomal biogenesis and epithelial cell proliferative potential through BNC1.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay","journal":"European journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay, two orthogonal methods, single lab","pmids":["21741828"],"is_preprint":false},{"year":2012,"finding":"BNC1 is required for maintenance of spermatogenesis in mice. Bnc1-null male mice are sub-fertile and show progressive age-dependent loss of germ cells leading to Sertoli-cell-only tubules, declining sperm count and motility. Bnc1 heterozygotes also showed dosage-sensitive reduction in sperm count and testis weight.","method":"Gene knockout (Bnc1-null mice) and heterozygote analysis; histology, sperm count, fertility assays","journal":"Genesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular and reproductive phenotype, dosage-sensitivity confirmed in heterozygotes","pmids":["22266914"],"is_preprint":false},{"year":2013,"finding":"HSF2BP, a testis-specific protein, binds BNC1 and inhibits its transcriptional activity by sequestering BNC1 to the cytoplasm. Co-expression of HSF2BP with BNC1 caused striking redistribution of BNC1 from nucleus to cytoplasm without affecting BNC1 expression level, identified by yeast two-hybrid screening and confirmed in mammalian cells.","method":"Yeast two-hybrid screening, co-immunoprecipitation/co-expression in mammalian cells, subcellular localization imaging, transcriptional activity reporter assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus subcellular redistribution assay plus reporter assay, multiple orthogonal methods, single lab","pmids":["23707421"],"is_preprint":false},{"year":2015,"finding":"RNAi-mediated knockdown of BNC1 in breast cancer cell lines resulted in a significant increase in migratory and invasive potential, indicating BNC1 suppresses cell migration and invasion.","method":"RNAi knockdown in breast cancer cell lines, migration and invasion assays","journal":"Clinical epigenetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (RNAi + phenotypic readout), no pathway placement beyond transcription factor description","pmids":["26052355"],"is_preprint":false},{"year":2019,"finding":"BNC1 regulates cell heterogeneity in human pluripotent stem cell-derived epicardium. Single-cell RNA sequencing revealed that BNC1-high and TCF21-high epicardial subpopulations define distinct cell fates; knockdown of BNC1 during epicardial establishment resulted in a homogeneous TCF21-high population, demonstrating BNC1 is required for maintaining epicardial cell heterogeneity and fate specification.","method":"Single-cell RNA sequencing of hPSC-derived epicardium, RNAi knockdown of BNC1, differentiation assays into cardiac fibroblasts and smooth muscle cells","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — scRNA-seq plus functional KD with defined differentiation phenotype, two orthogonal approaches, single lab","pmids":["31767620"],"is_preprint":false},{"year":2020,"finding":"BNC1 directly binds the promoters of spermatogenesis genes Klhl10, Tex14, and Spatc1 in mouse testis (by ChIP-seq). BNC1 physically associates with the germ cell-specific transcription factor TAF7L both in vitro and in testis (by biochemical analysis). A BNC1 truncation mutation disabled nuclear translocation of the BNC1/TAF7L complex, thereby disrupting spermatogenesis-specific gene expression and causing testicular premature aging.","method":"Chromatin immunoprecipitation sequencing (ChIP-seq), co-immunoprecipitation (in vitro and in testis), genome-wide expression profiling, mouse truncation mutation model","journal":"Journal of molecular cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP-seq for direct binding, reciprocal co-IP for physical interaction, multiple orthogonal methods, confirmed in vivo in mouse model","pmids":["31065688"],"is_preprint":false},{"year":2020,"finding":"BNC1 directly binds BNC1-binding elements in the promoter regions of Ybx2 and Papolb to induce their transcription, promoting spermatogenesis. Confirmed by ChIP of mouse testicular tissue and luciferase reporter assays. Loss of BNC1 led to germ cell apoptosis and decreased YBX2 and PAPOLB protein levels.","method":"Chromatin immunoprecipitation (ChIP) of mouse testicular tissue, luciferase reporter assay in HEK293 cells, Bnc1 knockdown in CRL-2196 cells, mouse truncation mutation model","journal":"Reproductive sciences","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP plus reporter assay, two orthogonal methods, single lab","pmids":["33211273"],"is_preprint":false},{"year":2022,"finding":"BNC1 deficiency in oocytes triggers ferroptosis via the NF2-YAP pathway, causing premature follicular activation and excessive follicular atresia leading to primary ovarian insufficiency (POI). Pharmacologic inhibition of YAP signaling or ferroptosis significantly rescued the POI phenotype in Bnc1-mutant mice.","method":"Targeted Bnc1 mutation mouse model, pharmacologic rescue experiments (YAP inhibitor, ferroptosis inhibitor), lipid metabolism and redox homeostasis assays in oocytes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — defined mouse KO/mutation model with specific cellular phenotype (ferroptosis), pathway placement by pharmacologic rescue, multiple orthogonal approaches","pmids":["36198708"],"is_preprint":false},{"year":2024,"finding":"BNC1 deficiency in spermatogonia causes mitochondrial dysfunction (lower mitochondrial membrane potential, higher ROS) and apoptosis via downregulation of the CREB/SIRT1/FOXO3 signaling pathway. Nicotinamide riboside or metformin reversed mitochondrial dysfunction and inhibited apoptosis in Bnc1-knockdown spermatogonia by stimulating CREB/SIRT1/FOXO3 signaling.","method":"Bnc1 truncation mutation mouse model, Bnc1 knockdown in spermatogonia, mitochondrial membrane potential assay, ROS measurement, pharmacologic rescue (nicotinamide riboside, metformin), CREB/SIRT1/FOXO3 pathway analysis","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD/KO with specific cellular phenotype plus pharmacologic pathway rescue, multiple orthogonal methods, single lab","pmids":["38079523"],"is_preprint":false},{"year":2023,"finding":"BNC1 physically interacts with PRMT1 (protein arginine methyltransferase 1) to co-activate proliferative/cell-cycle gene programs in squamous cell carcinoma (SCC). ChIP-seq identified direct BNC1 transcriptional targets; BNC1 inhibition suppressed proliferation and increased migration via FRA1, while also repressing IRF6-dependent differentiation. PRMT1 inhibition selectively blocked BNC1-dependent proliferative gene activation without affecting BNC1's repression of promigratory genes.","method":"RNA-seq, ChIP-seq, protein interactome analysis, RNAi knockdown, PRMT1 inhibitor treatment in SCC xenografts","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus interactome analysis plus in vivo xenograft rescue, multiple orthogonal methods, single lab, preprint","pmids":["37034732"],"is_preprint":true},{"year":2025,"finding":"BNC1 physically interacts with PRMT1 to activate cell cycle genes in SCC. BNC1 activates proliferation genes while repressing a FRA1-dependent promigratory program and an IRF6-dependent differentiation program, thus controlling the proliferation-differentiation-migration axis in squamous epithelium. PRMT1 inhibition blocks proliferative gene activation without affecting repression of promigratory genes.","method":"RNA-seq, ChIP-seq, physical interaction assays, PRMT1 inhibitor treatment, SCC xenograft experiments","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus direct physical interaction assay plus in vivo xenograft, multiple orthogonal methods, single lab","pmids":["40962202"],"is_preprint":false},{"year":2025,"finding":"HSF2BP directly binds to BNC1 (C-terminal hydrophobic domain essential), suppressing BNC1 transcriptional activity and leading to reduced activation of TGF-β/SMAD3 signaling in lung adenocarcinoma cells. Co-immunoprecipitation confirmed the physical interaction; overexpression and knockdown experiments in LUAD cell lines and in vivo mouse models established the HSF2BP→BNC1→TGF-β/SMAD3 regulatory axis.","method":"Co-immunoprecipitation, lentiviral overexpression/knockdown in LUAD cell lines, in vivo subcutaneous tumorigenesis in mice, RT-qPCR, Western blot, flow cytometry, ELISA","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus in vivo model plus multiple functional assays, single lab, multiple orthogonal methods","pmids":["41083582"],"is_preprint":false},{"year":2025,"finding":"BNC1 suppresses CCL20 expression by directly binding to the CCL20 promoter, thereby reducing JAK-STAT signaling activation and promoting apoptosis in gastric cancer cells. Overexpression of BNC1 inhibited proliferation, migration, and invasion both in vitro and in vivo.","method":"Transcriptome sequencing, promoter-binding assays, overexpression/knockdown in gastric cancer cell lines, in vivo mouse model","journal":"PeerJ","confidence":"Low","confidence_rationale":"Tier 3 / Weak — promoter binding assay plus phenotypic overexpression data, single lab, limited mechanistic depth reported in abstract","pmids":["40444282"],"is_preprint":false},{"year":2024,"finding":"BNC1 reduces glioma cell proliferation and enhances ferroptosis through the TCF21/PI3K signaling pathway. BNC1 protein was shown to interact with TCF21 protein; BNC1 enhanced TCF21 expression in vivo (bioluminescence imaging). SiTCF21 or enhanced TCF21 expression both declined BNC1-mediated ferroptosis effects, placing BNC1 upstream of TCF21 in this pathway.","method":"Cell proliferation assays, ferroptosis assays, co-immunoprecipitation (BNC1-TCF21 interaction), siRNA knockdown of TCF21, bioluminescence imaging in mouse glioma model, ferroptosis inhibitor/agonist pharmacology","journal":"Tissue & cell","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, limited mechanistic validation in abstract, pathway assignment based primarily on pharmacological and KD experiments without deep structural or biochemical validation","pmids":["39603023"],"is_preprint":false}],"current_model":"BNC1 (Basonuclin 1) is a zinc finger transcription factor and ion channel subunit with dual roles: as a DEG/ENaC family Na+ channel in sensory neurons (where it is essential for low-threshold mechanosensation via lanceolate nerve endings, with pore structure defined by Gly430, and localization regulated by PDZ-domain interaction with PICK1), and as a nuclear transcription factor in gametogenic cells and stratified epithelia (where it directly binds target gene promoters including Ybx2, Papolb, Klhl10, CCL20, and cell cycle genes to regulate spermatogenesis, epicardial cell heterogeneity, and SCC proliferation; it is activated by p63, physically cooperates with TAF7L and PRMT1 as co-activators, and is negatively regulated by HSF2BP-mediated cytoplasmic sequestration; in oocytes, BNC1 deficiency triggers ferroptosis via the NF2-YAP pathway causing primary ovarian insufficiency)."},"narrative":{"mechanistic_narrative":"BNC1 (Basonuclin 1) is a dual-function gene whose products operate in two distinct cellular contexts: as a DEG/ENaC-family sodium channel subunit required for sensory mechanotransduction, and as a sequence-specific zinc-finger transcription factor governing gametogenesis, epithelial cell fate, and tumor-cell behavior [PMID:11069180, PMID:31065688]. As a channel, BNC1 is essential for low-threshold rapidly adapting mechanosensation, localizing to lanceolate nerve endings around hair follicles, where its loss selectively impairs mechanoreceptor responses without affecting acid-evoked currents [PMID:11069180]; the conduction pore is shaped by the residue Gly430, whose mutation alters quaternary-ammonium block consistent with a multi-ion pore [PMID:10049320], and channel surface distribution is controlled through a C-terminal interaction with the PDZ-domain protein PICK1 [PMID:11802773]. As a transcription factor, BNC1 is a direct target of p63 [PMID:21741828] and is required to maintain spermatogenesis, with dosage-sensitive germ-cell loss in knockout mice [PMID:22266914]. In the testis, BNC1 directly binds promoters of spermatogenic genes including Klhl10, Tex14, Spatc1, Ybx2, and Papolb and partners with the germ-cell transcription factor TAF7L; truncations that block nuclear translocation of the BNC1/TAF7L complex disrupt this program [PMID:31065688, PMID:33211273]. BNC1 transcriptional output is restrained by HSF2BP, which binds its C-terminal hydrophobic domain and sequesters it in the cytoplasm [PMID:23707421, PMID:41083582]. In squamous epithelium, BNC1 cooperates with the arginine methyltransferase PRMT1 to activate cell-cycle genes while repressing FRA1-dependent migratory and IRF6-dependent differentiation programs, controlling the proliferation–differentiation–migration axis [PMID:37034732, PMID:40962202]. BNC1 also maintains epicardial cell heterogeneity in human pluripotent-stem-cell-derived epicardium [PMID:31767620], and its loss in oocytes triggers ferroptosis through the NF2-YAP pathway to cause primary ovarian insufficiency [PMID:36198708].","teleology":[{"year":2000,"claim":"Established that BNC1 functions in vivo as a channel subunit required for a specific sensory modality, distinguishing mechanosensation from pH sensing.","evidence":"BNC1-null mice with mechanoreceptor electrophysiology and immunolocalization to lanceolate nerve endings","pmids":["11069180"],"confidence":"High","gaps":["Did not resolve the channel's molecular composition or co-subunits","Mechanism coupling mechanical force to channel gating not defined"]},{"year":1999,"claim":"Defined a pore-lining residue and provided structural insight into the BNC1 channel conduction pathway.","evidence":"Patch-clamp electrophysiology with Gly430 mutagenesis and size-varied quaternary ammonium blockers","pmids":["10049320"],"confidence":"High","gaps":["No full channel structure","Native subunit stoichiometry in sensory neurons unknown"]},{"year":2002,"claim":"Identified a PDZ-mediated mechanism controlling channel surface distribution, linking BNC1 to scaffold-dependent trafficking.","evidence":"Yeast two-hybrid and mammalian co-expression with C-terminal deletion and PDZ point mutants, plus subcellular imaging","pmids":["11802773"],"confidence":"Medium","gaps":["Functional consequence of PICK1 redistribution for mechanotransduction in vivo not tested","Single lab"]},{"year":2011,"claim":"Placed the BNC1 transcription factor downstream of p63, connecting it to epithelial proliferative regulation.","evidence":"ChIP and luciferase reporter assays on the BNC1 promoter","pmids":["21741828"],"confidence":"Medium","gaps":["Downstream BNC1 targets in this context not enumerated","Single lab"]},{"year":2012,"claim":"Demonstrated a non-redundant, dosage-sensitive requirement for BNC1 in maintaining spermatogenesis.","evidence":"Bnc1-null and heterozygote mice with histology, sperm count, and fertility assays","pmids":["22266914"],"confidence":"High","gaps":["Direct transcriptional targets not yet identified at this stage","Cell-type-specific mechanism of germ-cell loss unresolved"]},{"year":2013,"claim":"Revealed cytoplasmic sequestration as a regulatory mechanism limiting BNC1 transcriptional activity.","evidence":"Yeast two-hybrid screen, co-IP/co-expression, subcellular imaging and reporter assay with HSF2BP","pmids":["23707421"],"confidence":"Medium","gaps":["Physiological trigger for HSF2BP-BNC1 binding unknown","Single lab"]},{"year":2020,"claim":"Mapped genome-wide direct BNC1 targets and a transcription-factor partner driving the spermatogenic program.","evidence":"ChIP-seq, reciprocal co-IP in testis, expression profiling, and a mouse truncation model; complementary ChIP/reporter work on Ybx2 and Papolb","pmids":["31065688","33211273"],"confidence":"High","gaps":["Genome-wide TAF7L co-occupancy not fully resolved","How truncation blocks nuclear translocation mechanistically unclear"]},{"year":2019,"claim":"Extended BNC1 function to developmental cell-fate specification, establishing its role in maintaining epicardial heterogeneity.","evidence":"scRNA-seq and RNAi knockdown in hPSC-derived epicardium with differentiation assays","pmids":["31767620"],"confidence":"Medium","gaps":["Direct BNC1 targets governing epicardial fate not identified","Single system"]},{"year":2022,"claim":"Identified a ferroptosis-based mechanism by which BNC1 loss causes primary ovarian insufficiency, with pharmacologically tractable pathway placement.","evidence":"Bnc1-mutant mice with YAP and ferroptosis inhibitor rescue and oocyte redox/lipid assays","pmids":["36198708"],"confidence":"High","gaps":["Whether BNC1 directly regulates NF2-YAP pathway genes not shown","Direct promoter targets in oocytes undefined"]},{"year":2024,"claim":"Linked BNC1 to mitochondrial homeostasis in spermatogonia through a defined signaling axis.","evidence":"Bnc1 knockdown/truncation models with mitochondrial and ROS assays and nicotinamide riboside/metformin rescue of CREB/SIRT1/FOXO3 signaling","pmids":["38079523"],"confidence":"Medium","gaps":["Whether CREB/SIRT1/FOXO3 genes are direct BNC1 targets unclear","Single lab"]},{"year":2023,"claim":"Defined a co-activator partnership with PRMT1 that separates BNC1's proliferative activation from its repressive programs in squamous epithelium.","evidence":"RNA-seq, ChIP-seq, interactome analysis, RNAi and PRMT1 inhibition in SCC xenografts (preprint and peer-reviewed)","pmids":["37034732","40962202"],"confidence":"Medium","gaps":["Direct arginine-methylation substrate driving co-activation not pinned down","Single lab"]},{"year":2025,"claim":"Extended HSF2BP-mediated suppression of BNC1 to cancer signaling, defining an HSF2BP→BNC1→TGF-β/SMAD3 axis.","evidence":"Co-IP and overexpression/knockdown in LUAD cell lines and in vivo tumorigenesis with multiple functional readouts","pmids":["41083582"],"confidence":"Medium","gaps":["Whether BNC1 directly binds TGF-β/SMAD3 pathway promoters not shown","Single lab"]},{"year":2025,"claim":"Implicated BNC1 as a transcriptional repressor of CCL20 modulating JAK-STAT signaling and apoptosis in gastric cancer.","evidence":"Transcriptome sequencing, promoter-binding and overexpression/knockdown assays with in vivo model","pmids":["40444282"],"confidence":"Low","gaps":["Limited mechanistic depth reported","Direct binding evidence not deeply validated"]},{"year":2024,"claim":"Proposed a BNC1-TCF21-PI3K ferroptosis axis in glioma.","evidence":"Proliferation/ferroptosis assays, co-IP for BNC1-TCF21 interaction, TCF21 knockdown and mouse glioma imaging","pmids":["39603023"],"confidence":"Low","gaps":["Pathway assignment relies on pharmacology and KD without deep biochemical validation","Direct transcriptional targets undefined"]},{"year":null,"claim":"It remains unresolved how a single gene yields both a plasma-membrane sodium channel and a nuclear zinc-finger transcription factor, and whether these reflect distinct isoforms, contexts, or annotations.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No study reconciles the channel and transcription-factor activities","No structural model bridging the two functions","Tissue-specific isoform usage uncharacterized in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,8,9,12,13]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[8,9,15]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,9,12,13]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[4,8,9,10]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7]}],"complexes":[],"partners":["PICK1","HSF2BP","TAF7L","PRMT1","TCF21","P63"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q01954","full_name":"Zinc finger protein basonuclin-1","aliases":[],"length_aa":994,"mass_kda":111.0,"function":"Transcriptional activator (By similarity). It is likely involved in the regulation of keratinocytes terminal differentiation in squamous epithelia and hair follicles (PubMed:8034748). Required for the maintenance of spermatogenesis (By similarity). It is involved in the positive regulation of oocyte maturation, probably acting through the control of BMP15 levels and regulation of AKT signaling cascade (PubMed:30010909). May also play a role in the early development of embryos (By similarity)","subcellular_location":"Nucleus; Cytoplasm; Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/Q01954/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BNC1","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BNC1","total_profiled":1310},"omim":[{"mim_id":"619110","title":"ARTHROGRYPOSIS, DISTAL, TYPE 1C; DA1C","url":"https://www.omim.org/entry/619110"},{"mim_id":"618723","title":"PREMATURE OVARIAN FAILURE 16; POF16","url":"https://www.omim.org/entry/618723"},{"mim_id":"618438","title":"SPASTIC ATAXIA 9, AUTOSOMAL RECESSIVE; SPAX9","url":"https://www.omim.org/entry/618438"},{"mim_id":"617378","title":"MYOSIN, LIGHT CHAIN 11; MYL11","url":"https://www.omim.org/entry/617378"},{"mim_id":"608669","title":"BASONUCLIN 2; BNC2","url":"https://www.omim.org/entry/608669"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"adipose tissue","ntpm":14.2},{"tissue":"esophagus","ntpm":12.0},{"tissue":"testis","ntpm":23.6}],"url":"https://www.proteinatlas.org/search/BNC1"},"hgnc":{"alias_symbol":["HsT19447","bn1","BSN1"],"prev_symbol":["BNC"]},"alphafold":{"accession":"Q01954","domains":[{"cath_id":"-","chopping":"64-173","consensus_level":"high","plddt":86.4126,"start":64,"end":173},{"cath_id":"3.30.160","chopping":"928-983","consensus_level":"high","plddt":81.2307,"start":928,"end":983},{"cath_id":"3.30.160","chopping":"733-782","consensus_level":"high","plddt":76.9024,"start":733,"end":782}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q01954","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q01954-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q01954-F1-predicted_aligned_error_v6.png","plddt_mean":54.34},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BNC1","jax_strain_url":"https://www.jax.org/strain/search?query=BNC1"},"sequence":{"accession":"Q01954","fasta_url":"https://rest.uniprot.org/uniprotkb/Q01954.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q01954/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q01954"}},"corpus_meta":[{"pmid":"11069180","id":"PMC_11069180","title":"The mammalian sodium channel BNC1 is required for normal touch sensation.","date":"2000","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/11069180","citation_count":406,"is_preprint":false},{"pmid":"36198708","id":"PMC_36198708","title":"BNC1 deficiency-triggered ferroptosis through the NF2-YAP pathway induces primary ovarian insufficiency.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/36198708","citation_count":131,"is_preprint":false},{"pmid":"30953539","id":"PMC_30953539","title":"Promoter methylation of ADAMTS1 and BNC1 as potential biomarkers for early detection of pancreatic cancer in blood.","date":"2019","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/30953539","citation_count":126,"is_preprint":false},{"pmid":"11802773","id":"PMC_11802773","title":"Interaction of the synaptic protein PICK1 (protein interacting with C kinase 1) with the non-voltage gated sodium channels BNC1 (brain Na+ channel 1) and ASIC (acid-sensing ion channel).","date":"2002","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/11802773","citation_count":98,"is_preprint":false},{"pmid":"26052355","id":"PMC_26052355","title":"The GALNT9, BNC1 and CCDC8 genes are frequently epigenetically dysregulated in breast tumours that metastasise to the brain.","date":"2015","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/26052355","citation_count":78,"is_preprint":false},{"pmid":"11157232","id":"PMC_11157232","title":"Cloning, sequencing, and characterization of a gene cluster involved in EDTA degradation from the bacterium BNC1.","date":"2001","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/11157232","citation_count":50,"is_preprint":false},{"pmid":"24223618","id":"PMC_24223618","title":"BNC Protects H9c2 Cardiomyoblasts from H 2 O 2 -Induced Oxidative Injury through ERK1/2 Signaling Pathway.","date":"2013","source":"Evidence-based complementary and alternative medicine : eCAM","url":"https://pubmed.ncbi.nlm.nih.gov/24223618","citation_count":46,"is_preprint":false},{"pmid":"34579912","id":"PMC_34579912","title":"Biocompatibility evaluation of a 3D-bioprinted alginate-GelMA-bacteria nanocellulose (BNC) scaffold laden with oriented-growth RSC96 cells.","date":"2021","source":"Materials science & engineering. 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Strain BN1 against the Cereal Head Blight Pathogen Fusarium graminearum.","date":"2013","source":"The plant pathology journal","url":"https://pubmed.ncbi.nlm.nih.gov/25288928","citation_count":22,"is_preprint":false},{"pmid":"34120211","id":"PMC_34120211","title":"BnA1.CER4 and BnC1.CER4 are redundantly involved in branched primary alcohols in the cuticle wax of Brassica napus.","date":"2021","source":"TAG. Theoretical and applied genetics. 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BNC1 protein was localized to lanceolate nerve endings surrounding hair follicles by direct immunolocalization. Acid-evoked currents in sensory neurons and acid-stimulated nociceptor responses were normal in BNC1-null mice (negative result for pH-sensing role).\",\n      \"method\": \"Gene knockout (BNC1-null mice), electrophysiology of mechanoreceptors, immunolocalization of channel protein in nerve endings\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined electrophysiological phenotype plus direct localization experiment, published in high-impact journal\",\n      \"pmids\": [\"11069180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"BNC1 channel pore structure probed by TEA block: external TEA blocks activated BNC1 (Gly430Val/Thr mutants) in a steeply voltage-dependent manner consistent with multi-ion block within the pore. Mutation Gly430Phe introduced a new TEA binding site ~30% across the electric field, providing structural insight into the channel pore.\",\n      \"method\": \"Electrophysiology (patch clamp) with site-directed mutagenesis of pore-lining residue Gly430; quaternary ammonium blockers of varying size\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro electrophysiology combined with active-site mutagenesis, single lab but two orthogonal approaches (mutagenesis + size-dependent block)\",\n      \"pmids\": [\"10049320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"BNC1 interacts with the PDZ-domain protein PICK1 via its C-terminus. Yeast two-hybrid and mammalian cell co-expression experiments showed that deletion of the BNC1 C-terminus or mutation of the PICK1 PDZ domain abolished the interaction. Co-expression of PICK1 altered the subcellular distribution of BNC1 channels in a PDZ-domain- and BNC1 C-terminus-dependent manner.\",\n      \"method\": \"Yeast two-hybrid assay, co-expression in mammalian cells, C-terminal deletion mutants, PDZ-domain point mutants, subcellular distribution imaging\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal yeast two-hybrid plus mammalian cell functional redistribution assay, two orthogonal methods, single lab\",\n      \"pmids\": [\"11802773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BNC1 (Basonuclin 1) is a direct transcriptional target of p63. Chromatin immunoprecipitation and reporter assays demonstrated that p63 directly binds the BNC1 promoter and induces BNC1 expression, linking p63 to regulation of ribosomal biogenesis and epithelial cell proliferative potential through BNC1.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay\",\n      \"journal\": \"European journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay, two orthogonal methods, single lab\",\n      \"pmids\": [\"21741828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BNC1 is required for maintenance of spermatogenesis in mice. Bnc1-null male mice are sub-fertile and show progressive age-dependent loss of germ cells leading to Sertoli-cell-only tubules, declining sperm count and motility. Bnc1 heterozygotes also showed dosage-sensitive reduction in sperm count and testis weight.\",\n      \"method\": \"Gene knockout (Bnc1-null mice) and heterozygote analysis; histology, sperm count, fertility assays\",\n      \"journal\": \"Genesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular and reproductive phenotype, dosage-sensitivity confirmed in heterozygotes\",\n      \"pmids\": [\"22266914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HSF2BP, a testis-specific protein, binds BNC1 and inhibits its transcriptional activity by sequestering BNC1 to the cytoplasm. Co-expression of HSF2BP with BNC1 caused striking redistribution of BNC1 from nucleus to cytoplasm without affecting BNC1 expression level, identified by yeast two-hybrid screening and confirmed in mammalian cells.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation/co-expression in mammalian cells, subcellular localization imaging, transcriptional activity reporter assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus subcellular redistribution assay plus reporter assay, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"23707421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RNAi-mediated knockdown of BNC1 in breast cancer cell lines resulted in a significant increase in migratory and invasive potential, indicating BNC1 suppresses cell migration and invasion.\",\n      \"method\": \"RNAi knockdown in breast cancer cell lines, migration and invasion assays\",\n      \"journal\": \"Clinical epigenetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (RNAi + phenotypic readout), no pathway placement beyond transcription factor description\",\n      \"pmids\": [\"26052355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BNC1 regulates cell heterogeneity in human pluripotent stem cell-derived epicardium. Single-cell RNA sequencing revealed that BNC1-high and TCF21-high epicardial subpopulations define distinct cell fates; knockdown of BNC1 during epicardial establishment resulted in a homogeneous TCF21-high population, demonstrating BNC1 is required for maintaining epicardial cell heterogeneity and fate specification.\",\n      \"method\": \"Single-cell RNA sequencing of hPSC-derived epicardium, RNAi knockdown of BNC1, differentiation assays into cardiac fibroblasts and smooth muscle cells\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — scRNA-seq plus functional KD with defined differentiation phenotype, two orthogonal approaches, single lab\",\n      \"pmids\": [\"31767620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BNC1 directly binds the promoters of spermatogenesis genes Klhl10, Tex14, and Spatc1 in mouse testis (by ChIP-seq). BNC1 physically associates with the germ cell-specific transcription factor TAF7L both in vitro and in testis (by biochemical analysis). A BNC1 truncation mutation disabled nuclear translocation of the BNC1/TAF7L complex, thereby disrupting spermatogenesis-specific gene expression and causing testicular premature aging.\",\n      \"method\": \"Chromatin immunoprecipitation sequencing (ChIP-seq), co-immunoprecipitation (in vitro and in testis), genome-wide expression profiling, mouse truncation mutation model\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP-seq for direct binding, reciprocal co-IP for physical interaction, multiple orthogonal methods, confirmed in vivo in mouse model\",\n      \"pmids\": [\"31065688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BNC1 directly binds BNC1-binding elements in the promoter regions of Ybx2 and Papolb to induce their transcription, promoting spermatogenesis. Confirmed by ChIP of mouse testicular tissue and luciferase reporter assays. Loss of BNC1 led to germ cell apoptosis and decreased YBX2 and PAPOLB protein levels.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) of mouse testicular tissue, luciferase reporter assay in HEK293 cells, Bnc1 knockdown in CRL-2196 cells, mouse truncation mutation model\",\n      \"journal\": \"Reproductive sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP plus reporter assay, two orthogonal methods, single lab\",\n      \"pmids\": [\"33211273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BNC1 deficiency in oocytes triggers ferroptosis via the NF2-YAP pathway, causing premature follicular activation and excessive follicular atresia leading to primary ovarian insufficiency (POI). Pharmacologic inhibition of YAP signaling or ferroptosis significantly rescued the POI phenotype in Bnc1-mutant mice.\",\n      \"method\": \"Targeted Bnc1 mutation mouse model, pharmacologic rescue experiments (YAP inhibitor, ferroptosis inhibitor), lipid metabolism and redox homeostasis assays in oocytes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — defined mouse KO/mutation model with specific cellular phenotype (ferroptosis), pathway placement by pharmacologic rescue, multiple orthogonal approaches\",\n      \"pmids\": [\"36198708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BNC1 deficiency in spermatogonia causes mitochondrial dysfunction (lower mitochondrial membrane potential, higher ROS) and apoptosis via downregulation of the CREB/SIRT1/FOXO3 signaling pathway. Nicotinamide riboside or metformin reversed mitochondrial dysfunction and inhibited apoptosis in Bnc1-knockdown spermatogonia by stimulating CREB/SIRT1/FOXO3 signaling.\",\n      \"method\": \"Bnc1 truncation mutation mouse model, Bnc1 knockdown in spermatogonia, mitochondrial membrane potential assay, ROS measurement, pharmacologic rescue (nicotinamide riboside, metformin), CREB/SIRT1/FOXO3 pathway analysis\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD/KO with specific cellular phenotype plus pharmacologic pathway rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"38079523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BNC1 physically interacts with PRMT1 (protein arginine methyltransferase 1) to co-activate proliferative/cell-cycle gene programs in squamous cell carcinoma (SCC). ChIP-seq identified direct BNC1 transcriptional targets; BNC1 inhibition suppressed proliferation and increased migration via FRA1, while also repressing IRF6-dependent differentiation. PRMT1 inhibition selectively blocked BNC1-dependent proliferative gene activation without affecting BNC1's repression of promigratory genes.\",\n      \"method\": \"RNA-seq, ChIP-seq, protein interactome analysis, RNAi knockdown, PRMT1 inhibitor treatment in SCC xenografts\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus interactome analysis plus in vivo xenograft rescue, multiple orthogonal methods, single lab, preprint\",\n      \"pmids\": [\"37034732\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BNC1 physically interacts with PRMT1 to activate cell cycle genes in SCC. BNC1 activates proliferation genes while repressing a FRA1-dependent promigratory program and an IRF6-dependent differentiation program, thus controlling the proliferation-differentiation-migration axis in squamous epithelium. PRMT1 inhibition blocks proliferative gene activation without affecting repression of promigratory genes.\",\n      \"method\": \"RNA-seq, ChIP-seq, physical interaction assays, PRMT1 inhibitor treatment, SCC xenograft experiments\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus direct physical interaction assay plus in vivo xenograft, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"40962202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HSF2BP directly binds to BNC1 (C-terminal hydrophobic domain essential), suppressing BNC1 transcriptional activity and leading to reduced activation of TGF-β/SMAD3 signaling in lung adenocarcinoma cells. Co-immunoprecipitation confirmed the physical interaction; overexpression and knockdown experiments in LUAD cell lines and in vivo mouse models established the HSF2BP→BNC1→TGF-β/SMAD3 regulatory axis.\",\n      \"method\": \"Co-immunoprecipitation, lentiviral overexpression/knockdown in LUAD cell lines, in vivo subcutaneous tumorigenesis in mice, RT-qPCR, Western blot, flow cytometry, ELISA\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus in vivo model plus multiple functional assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41083582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BNC1 suppresses CCL20 expression by directly binding to the CCL20 promoter, thereby reducing JAK-STAT signaling activation and promoting apoptosis in gastric cancer cells. Overexpression of BNC1 inhibited proliferation, migration, and invasion both in vitro and in vivo.\",\n      \"method\": \"Transcriptome sequencing, promoter-binding assays, overexpression/knockdown in gastric cancer cell lines, in vivo mouse model\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — promoter binding assay plus phenotypic overexpression data, single lab, limited mechanistic depth reported in abstract\",\n      \"pmids\": [\"40444282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BNC1 reduces glioma cell proliferation and enhances ferroptosis through the TCF21/PI3K signaling pathway. BNC1 protein was shown to interact with TCF21 protein; BNC1 enhanced TCF21 expression in vivo (bioluminescence imaging). SiTCF21 or enhanced TCF21 expression both declined BNC1-mediated ferroptosis effects, placing BNC1 upstream of TCF21 in this pathway.\",\n      \"method\": \"Cell proliferation assays, ferroptosis assays, co-immunoprecipitation (BNC1-TCF21 interaction), siRNA knockdown of TCF21, bioluminescence imaging in mouse glioma model, ferroptosis inhibitor/agonist pharmacology\",\n      \"journal\": \"Tissue & cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, limited mechanistic validation in abstract, pathway assignment based primarily on pharmacological and KD experiments without deep structural or biochemical validation\",\n      \"pmids\": [\"39603023\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BNC1 (Basonuclin 1) is a zinc finger transcription factor and ion channel subunit with dual roles: as a DEG/ENaC family Na+ channel in sensory neurons (where it is essential for low-threshold mechanosensation via lanceolate nerve endings, with pore structure defined by Gly430, and localization regulated by PDZ-domain interaction with PICK1), and as a nuclear transcription factor in gametogenic cells and stratified epithelia (where it directly binds target gene promoters including Ybx2, Papolb, Klhl10, CCL20, and cell cycle genes to regulate spermatogenesis, epicardial cell heterogeneity, and SCC proliferation; it is activated by p63, physically cooperates with TAF7L and PRMT1 as co-activators, and is negatively regulated by HSF2BP-mediated cytoplasmic sequestration; in oocytes, BNC1 deficiency triggers ferroptosis via the NF2-YAP pathway causing primary ovarian insufficiency).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BNC1 (Basonuclin 1) is a dual-function gene whose products operate in two distinct cellular contexts: as a DEG/ENaC-family sodium channel subunit required for sensory mechanotransduction, and as a sequence-specific zinc-finger transcription factor governing gametogenesis, epithelial cell fate, and tumor-cell behavior [#0, #8]. As a channel, BNC1 is essential for low-threshold rapidly adapting mechanosensation, localizing to lanceolate nerve endings around hair follicles, where its loss selectively impairs mechanoreceptor responses without affecting acid-evoked currents [#0]; the conduction pore is shaped by the residue Gly430, whose mutation alters quaternary-ammonium block consistent with a multi-ion pore [#1], and channel surface distribution is controlled through a C-terminal interaction with the PDZ-domain protein PICK1 [#2]. As a transcription factor, BNC1 is a direct target of p63 [#3] and is required to maintain spermatogenesis, with dosage-sensitive germ-cell loss in knockout mice [#4]. In the testis, BNC1 directly binds promoters of spermatogenic genes including Klhl10, Tex14, Spatc1, Ybx2, and Papolb and partners with the germ-cell transcription factor TAF7L; truncations that block nuclear translocation of the BNC1/TAF7L complex disrupt this program [#8, #9]. BNC1 transcriptional output is restrained by HSF2BP, which binds its C-terminal hydrophobic domain and sequesters it in the cytoplasm [#5, #14]. In squamous epithelium, BNC1 cooperates with the arginine methyltransferase PRMT1 to activate cell-cycle genes while repressing FRA1-dependent migratory and IRF6-dependent differentiation programs, controlling the proliferation–differentiation–migration axis [#12, #13]. BNC1 also maintains epicardial cell heterogeneity in human pluripotent-stem-cell-derived epicardium [#7], and its loss in oocytes triggers ferroptosis through the NF2-YAP pathway to cause primary ovarian insufficiency [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that BNC1 functions in vivo as a channel subunit required for a specific sensory modality, distinguishing mechanosensation from pH sensing.\",\n      \"evidence\": \"BNC1-null mice with mechanoreceptor electrophysiology and immunolocalization to lanceolate nerve endings\",\n      \"pmids\": [\"11069180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the channel's molecular composition or co-subunits\", \"Mechanism coupling mechanical force to channel gating not defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined a pore-lining residue and provided structural insight into the BNC1 channel conduction pathway.\",\n      \"evidence\": \"Patch-clamp electrophysiology with Gly430 mutagenesis and size-varied quaternary ammonium blockers\",\n      \"pmids\": [\"10049320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full channel structure\", \"Native subunit stoichiometry in sensory neurons unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified a PDZ-mediated mechanism controlling channel surface distribution, linking BNC1 to scaffold-dependent trafficking.\",\n      \"evidence\": \"Yeast two-hybrid and mammalian co-expression with C-terminal deletion and PDZ point mutants, plus subcellular imaging\",\n      \"pmids\": [\"11802773\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of PICK1 redistribution for mechanotransduction in vivo not tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed the BNC1 transcription factor downstream of p63, connecting it to epithelial proliferative regulation.\",\n      \"evidence\": \"ChIP and luciferase reporter assays on the BNC1 promoter\",\n      \"pmids\": [\"21741828\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream BNC1 targets in this context not enumerated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated a non-redundant, dosage-sensitive requirement for BNC1 in maintaining spermatogenesis.\",\n      \"evidence\": \"Bnc1-null and heterozygote mice with histology, sperm count, and fertility assays\",\n      \"pmids\": [\"22266914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets not yet identified at this stage\", \"Cell-type-specific mechanism of germ-cell loss unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed cytoplasmic sequestration as a regulatory mechanism limiting BNC1 transcriptional activity.\",\n      \"evidence\": \"Yeast two-hybrid screen, co-IP/co-expression, subcellular imaging and reporter assay with HSF2BP\",\n      \"pmids\": [\"23707421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological trigger for HSF2BP-BNC1 binding unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapped genome-wide direct BNC1 targets and a transcription-factor partner driving the spermatogenic program.\",\n      \"evidence\": \"ChIP-seq, reciprocal co-IP in testis, expression profiling, and a mouse truncation model; complementary ChIP/reporter work on Ybx2 and Papolb\",\n      \"pmids\": [\"31065688\", \"33211273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide TAF7L co-occupancy not fully resolved\", \"How truncation blocks nuclear translocation mechanistically unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended BNC1 function to developmental cell-fate specification, establishing its role in maintaining epicardial heterogeneity.\",\n      \"evidence\": \"scRNA-seq and RNAi knockdown in hPSC-derived epicardium with differentiation assays\",\n      \"pmids\": [\"31767620\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct BNC1 targets governing epicardial fate not identified\", \"Single system\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a ferroptosis-based mechanism by which BNC1 loss causes primary ovarian insufficiency, with pharmacologically tractable pathway placement.\",\n      \"evidence\": \"Bnc1-mutant mice with YAP and ferroptosis inhibitor rescue and oocyte redox/lipid assays\",\n      \"pmids\": [\"36198708\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BNC1 directly regulates NF2-YAP pathway genes not shown\", \"Direct promoter targets in oocytes undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked BNC1 to mitochondrial homeostasis in spermatogonia through a defined signaling axis.\",\n      \"evidence\": \"Bnc1 knockdown/truncation models with mitochondrial and ROS assays and nicotinamide riboside/metformin rescue of CREB/SIRT1/FOXO3 signaling\",\n      \"pmids\": [\"38079523\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CREB/SIRT1/FOXO3 genes are direct BNC1 targets unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a co-activator partnership with PRMT1 that separates BNC1's proliferative activation from its repressive programs in squamous epithelium.\",\n      \"evidence\": \"RNA-seq, ChIP-seq, interactome analysis, RNAi and PRMT1 inhibition in SCC xenografts (preprint and peer-reviewed)\",\n      \"pmids\": [\"37034732\", \"40962202\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct arginine-methylation substrate driving co-activation not pinned down\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended HSF2BP-mediated suppression of BNC1 to cancer signaling, defining an HSF2BP→BNC1→TGF-β/SMAD3 axis.\",\n      \"evidence\": \"Co-IP and overexpression/knockdown in LUAD cell lines and in vivo tumorigenesis with multiple functional readouts\",\n      \"pmids\": [\"41083582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether BNC1 directly binds TGF-β/SMAD3 pathway promoters not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated BNC1 as a transcriptional repressor of CCL20 modulating JAK-STAT signaling and apoptosis in gastric cancer.\",\n      \"evidence\": \"Transcriptome sequencing, promoter-binding and overexpression/knockdown assays with in vivo model\",\n      \"pmids\": [\"40444282\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Limited mechanistic depth reported\", \"Direct binding evidence not deeply validated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Proposed a BNC1-TCF21-PI3K ferroptosis axis in glioma.\",\n      \"evidence\": \"Proliferation/ferroptosis assays, co-IP for BNC1-TCF21 interaction, TCF21 knockdown and mouse glioma imaging\",\n      \"pmids\": [\"39603023\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Pathway assignment relies on pharmacology and KD without deep biochemical validation\", \"Direct transcriptional targets undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single gene yields both a plasma-membrane sodium channel and a nuclear zinc-finger transcription factor, and whether these reflect distinct isoforms, contexts, or annotations.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No study reconciles the channel and transcription-factor activities\", \"No structural model bridging the two functions\", \"Tissue-specific isoform usage uncharacterized in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 8, 9, 12, 13]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [8, 9, 15]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 9, 12, 13]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [4, 8, 9, 10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PICK1\",\n      \"HSF2BP\",\n      \"TAF7L\",\n      \"PRMT1\",\n      \"TCF21\",\n      \"p63\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}