{"gene":"STX12","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2013,"finding":"STX13 (STX12) is required for autophagosome maturation: knockdown of STX13 or its binding partner Vti1a in mammalian cells caused LC3-positive puncta accumulation and blocked autophagic flux. STX13 was present on LC3-positive phagophores and was highly enriched on multilamellar structures induced by dysfunctional ESCRT-III. Loss of STX13 also caused accumulation of Atg5-positive puncta and multilamellar structure formation, suggesting STX13 participates in phagophore-to-autophagosome maturation. Genetically, Drosophila syx13 exhibited strong genetic interaction with mutant CHMP2B (ESCRT-III component).","method":"siRNA knockdown in mammalian cells, live-cell imaging (LC3/Atg5 puncta), Drosophila genetic modifier screen, electron microscopy","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in Drosophila plus orthogonal mammalian KD with multiple markers (LC3, Atg5, EM), replicated across two model systems","pmids":["24095276"],"is_preprint":false},{"year":2014,"finding":"STX12 (syntaxin13) and SNAP23 mediate membrane trafficking required for invadopodia formation and tumor cell invasion. The association of Src, EGFR, and β1 integrin at invadopodia is dependent on STX12/SNAP23-mediated traffic. Inhibition of SNARE function impaired delivery of Src and EGFR to developing invadopodia and blocked β1-integrin-dependent Src activation and EGFR phosphorylation (Tyr845). β1 integrin inhibition increased SNAP23–β1 integrin association and reduced STX12–SNAP23 interaction.","method":"Co-immunoprecipitation, SNARE inhibition, live-cell imaging of invadopodia, matrix degradation assay, invasion assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and functional invasion assay, single lab with multiple orthogonal methods","pmids":["24496451"],"is_preprint":false},{"year":2015,"finding":"STX13 (STX12), a recycling endosomal Qa-SNARE, is required for cargo delivery to maturing melanosomes. Depletion of STX13 in melanocytes reroutes melanosomal proteins TYR and TYRP1 to lysosomes. Live-cell imaging and EM showed STX13 co-distributes with melanosomal cargo in tubular-vesicular endosomes associated with maturing melanosomes. Deletion of the N-terminal regulatory domain of STX13 increases SNARE activity in vivo and melanosome cargo transport. STX13-dependent cargo transport requires the R-SNARE VAMP7; silencing VAMP7 blocks melanosome maturation, and STX13 and VAMP7 show mutual dependency for their localization.","method":"siRNA knockdown, live-cell imaging, electron microscopy, domain-deletion mutagenesis, pigmentation assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo mutagenesis + live imaging + EM + functional cargo tracking, multiple orthogonal methods in single study","pmids":["26208634"],"is_preprint":false},{"year":2019,"finding":"STX12 is a substrate of the endosomal kinase SGK3: SGK3 phosphorylates STX12 at Ser139 in vitro and in cells stimulated with IGF1. This phosphorylation is blocked by SGK3 knockout or pan-SGK inhibitor. SGK3 phosphorylation of STX12 enhanced interaction with the VAMP4/VTI1A/STX6-containing SNARE complex and promoted plasma membrane localization of STX12.","method":"Phosphoproteomic screen, in vitro kinase assay, Phos-tag analysis, SGK3 knockout cells, pharmacological inhibition","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay plus genetic KO plus pharmacological blockade, multiple orthogonal methods confirming substrate relationship","pmids":["31665227"],"is_preprint":false},{"year":2020,"finding":"STX12 expression is upregulated through a ROS/STAT3/NFE2L1 transcriptional axis downstream of mitochondrial respiratory defects in hepatoma cells. NFE2L1 was identified as a direct transcriptional regulator of STX12 by cDNA microarray after NFE2L1 overexpression/depletion. STX12 functions as a key downstream effector of NFE2L1 modulating hepatoma cell invasiveness.","method":"cDNA microarray, NFE2L1 overexpression/depletion, ROS measurement, STAT3 inhibition, invasion assay, immunohistochemistry","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transcriptional target validated by gain/loss-of-function with functional invasiveness readout, single lab with multiple orthogonal approaches","pmids":["32942643"],"is_preprint":false},{"year":2021,"finding":"tSNARE1, a schizophrenia-risk protein, competes with STX12 for incorporation into an endosomal SNARE complex, supporting a role for tSNARE1 as an inhibitory SNARE that negatively regulates early-to-late endosomal trafficking in which STX12 participates.","method":"Biochemical competition assay (SNARE complex incorporation), live-cell imaging, RNA-sequencing","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical competition assay with live-cell imaging, but the primary focus is tSNARE1; STX12's complex membership is supporting data","pmids":["34642214"],"is_preprint":false},{"year":2022,"finding":"STX12 (Stx12) physically associates with VPS16B/VPS33B and is required for platelet α-granule biogenesis in megakaryocytes. Stx12-deficient megakaryocytes display reduced α-granule numbers and overall α-granule protein levels. CCDC22 (CCC complex) competes with Stx12 for binding to VPS16B/VPS33B, suggesting a hand-off mechanism between endosomal entry (Stx12-mediated fusion) and exit (CCC-mediated retrieval).","method":"Co-immunoprecipitation, Stx12 knockdown/knockout in megakaryocytes, α-granule quantification by electron microscopy, competitive binding assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal co-IP, genetic deficiency with EM quantification of organelle number, competitive binding, multiple orthogonal methods","pmids":["34905616"],"is_preprint":false},{"year":2024,"finding":"The Chlamydia trachomatis effector IncE recruits STX7- and STX12-containing vesicles to the bacterial inclusion via a short linear motif (SLiM) in its cytosolic C-terminus that mimics an R-SNARE motif, binding STX12-containing vesicles to facilitate intracellular bacterial development.","method":"SLiM mutant analysis, pulldown/binding assays, fluorescence imaging of vesicle recruitment to inclusion","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis of SLiM plus imaging of vesicle recruitment; STX12 involvement shown as part of broader IncE mechanism, single study","pmids":["39154341"],"is_preprint":false},{"year":2023,"finding":"F. nucleatum infection promotes miR-31 expression in colorectal cancer cells; miR-31 inhibits autophagic flux by targeting STX12. STX12 knockdown phenocopied miR-31 overexpression in blocking autophagy, and STX12, miR-31, and F. nucleatum form a regulatory loop in the autophagy pathway.","method":"miR-31 overexpression/knockout, STX12 knockdown, autophagic flux assay (LC3 accumulation), luciferase reporter for miR-31 targeting of STX12","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — miRNA target validation with autophagic flux assay, single lab, functional rescue experiments","pmids":["37216106"],"is_preprint":false},{"year":2025,"finding":"STX12 deficiency causes depolarization of mitochondrial membrane potential, reduced mitochondrial complex subunit levels, mitochondrial DNA (mtDNA) release into the cytoplasm, and activation of the cGAS-STING pathway and Type I interferon pathway in lung tissue of Stx12-/- mice. Stx12 knockout mice exhibit perinatal lethality with severe pulmonary inflammation, neutrophil infiltration, and increased cytokines.","method":"Stx12 knockout mice, zebrafish Stx12 depletion, mitochondrial membrane potential measurement (JC-1), Western blot for complex subunits, qPCR for interferon genes, immunohistochemistry","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in two model organisms (mice + zebrafish) with multiple orthogonal readouts, single lab","pmids":["40200300"],"is_preprint":false},{"year":2025,"finding":"STX12 loss in zebrafish and mice causes pericardial edema, cardiac malformations, and heart failure associated with disrupted mitochondrial morphology, reduced iron and zinc, impaired ATP production, and prolonged cardiomyocyte repolarization due to decreased SERCA activity. Rapamycin treatment restores mitochondrial protein expression via TFEB-PGC1α and enhances SERCA activity via CAMKII-phospholamban pathway.","method":"Zebrafish morpholino knockdown, mouse Stx12 knockout, echocardiography, mitochondrial morphology EM, ATP measurement, metal quantification, SERCA activity assay, rapamycin treatment","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in two organisms with multiple functional readouts, pharmacological rescue identifies pathway, single lab","pmids":["40568929"],"is_preprint":false},{"year":2025,"finding":"ELAPOR1, a tethering factor for proacrosomal vesicle fusion during acrosome biogenesis, physically interacts with STX12. Conditional knockout of Stx12 in germ cells resulted in defective acrosome biogenesis similar to Elapor1-/- mice, establishing STX12 as part of the vesicle fusion machinery for acrosome formation.","method":"Co-immunoprecipitation, conditional Stx12 knockout in germ cells, acrosome morphology by fluorescence and electron microscopy","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and conditional KO with organelle morphology readout, single study","pmids":["40737321"],"is_preprint":false},{"year":2025,"finding":"ATG9A vesicles fuse with the plasma membrane via an STX13-SNAP23-VAMP3 SNARE complex to secrete galectin-9 and other proteins (galectin-4, galectin-8, annexin A6) in an autophagy-independent unconventional secretion pathway.","method":"SNARE knockdown/knockout, co-immunoprecipitation, live-cell imaging of vesicle fusion, galectin-9 secretion assay","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KD of individual SNARE components with secretion readout and co-IP, single lab with multiple orthogonal methods","pmids":["40335523"],"is_preprint":false},{"year":2025,"finding":"STX12 knockdown reduces MR1 antigen presentation of Mycobacterium tuberculosis-derived ligands to MAIT cells in airway epithelial cells. Stx12 blockade increases MR1 surface stabilization and total MR1 expression, indicating that STX12-dependent endosomal trafficking is required for MR1 internalization and antigen loading at sorting endosomes.","method":"siRNA-mediated knockdown, MR1 surface expression by flow cytometry, MR1-GFP co-localization imaging, MAIT cell activation assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with functional antigen presentation readout and MR1 localization imaging, single lab","pmids":["42215548"],"is_preprint":false},{"year":2026,"finding":"Coronin-1a (Coro1a) promotes extracellular vesicle biogenesis by facilitating assembly of the STX12-SNAP23-VAMP7 SNARE complex to drive multivesicular body–plasma membrane fusion. Coro1a activates PKM2 to phosphorylate SNAP23, which recruits STX12 and VAMP7 into the SNARE complex; this effect is abolished by PKM2 inhibition or SNAP23 silencing.","method":"Co-immunoprecipitation, SNARE complex assembly assay, PKM2 inhibition, SNAP23 knockdown, EV quantification","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus pharmacological and genetic perturbation with functional EV biogenesis readout, single lab with multiple orthogonal methods","pmids":["42265296"],"is_preprint":false},{"year":2026,"finding":"SF3A1 (splicing factor 3A1) stabilizes STX12 mRNA in colorectal cancer cells; STX12 functions downstream of SF3A1 to inhibit apoptosis. Knockdown of STX12 alone induces apoptosis in CRC cells (but not non-cancerous cells), and SF3A1 knockdown reduces STX12 mRNA levels, establishing an SF3A1–STX12 anti-apoptotic axis in CRC.","method":"RNA-immunoprecipitation (RIP), STX12 knockdown, TUNEL staining, PARP cleavage, caspase-3/7 activity, xenograft mouse model","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP validation, genetic KD with multiple apoptosis readouts in vitro and xenograft model, single lab","pmids":["41683622"],"is_preprint":false},{"year":2026,"finding":"GRIPAP1, an endosomal tethering factor for platelet α-granule biogenesis, localizes to endosome subdomains decorated by Rab4a and Stx12. Artificial mislocalization of GRIPAP1 to mitochondria was sufficient to recruit Rab4a/Stx12 compartments containing internalized transferrin and newly synthesized PF4 to mitochondria, indicating that Stx12 marks a specific Rab4a-positive endosomal subdomain involved in α-granule cargo sorting.","method":"Co-localization imaging, artificial mitochondrial targeting of GRIPAP1, transferrin trafficking assay, PF4 trafficking assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — organelle mislocalization experiment with cargo tracking; STX12 is a co-localizing marker rather than primary subject, single study","pmids":["41632639"],"is_preprint":false}],"current_model":"STX12 (also known as STX13) is a recycling/sorting endosomal Qa-SNARE that mediates vesicle fusion at endosomes in concert with partner SNAREs (VAMP7, SNAP23, VAMP3, VTI1A); it is phosphorylated at Ser139 by the endosomal kinase SGK3, which enhances its assembly into SNARE complexes and promotes plasma membrane localization, and it participates in multiple distinct trafficking pathways including phagophore-to-autophagosome maturation, melanosome biogenesis, platelet α-granule biogenesis, invadopodia-dependent tumor invasion, unconventional galectin secretion, MR1-mediated antigen presentation, and acrosome biogenesis, while also playing essential roles in mitochondrial homeostasis and cardiomyocyte function whose mechanistic link to its SNARE activity remains under investigation."},"narrative":{"mechanistic_narrative":"STX12 (also called STX13) is a recycling/sorting-endosomal Qa-SNARE that drives membrane fusion across multiple trafficking pathways by assembling with cognate partner SNAREs [PMID:26208634, PMID:40335523, PMID:42265296]. In melanocytes it mediates cargo delivery to maturing melanosomes in partnership with the R-SNARE VAMP7, on which it is mutually dependent for localization; its N-terminal regulatory domain restrains SNARE activity, and deleting that domain enhances both complex assembly and cargo transport [PMID:26208634]. STX12 is phosphorylated at Ser139 by the endosomal kinase SGK3, which strengthens its incorporation into VAMP4/VTI1A/STX6-containing SNARE complexes and promotes its plasma-membrane localization [PMID:31665227]. Through these fusion activities STX12 supports autophagosome maturation, where its loss blocks autophagic flux and accumulates LC3/Atg5 puncta in cooperation with Vti1a and the ESCRT-III machinery [PMID:24095276], and contributes to organelle biogenesis programs including platelet alpha-granule formation via binding to VPS16B/VPS33B [PMID:34905616], acrosome biogenesis via the tethering factor ELAPOR1 [PMID:40737321], unconventional galectin secretion through an STX13-SNAP23-VAMP3 complex on ATG9A vesicles [PMID:40335523], and MR1-mediated antigen presentation at sorting endosomes [PMID:42215548]. STX12-dependent trafficking is also exploited by pathogens, as the Chlamydia effector IncE recruits STX12-containing vesicles via an R-SNARE-mimetic motif [PMID:39154341], and it promotes invadopodia-dependent tumor invasion by delivering Src and EGFR to invadopodia together with SNAP23 [PMID:24496451]. Genetic loss of STX12 in mice and zebrafish causes mitochondrial dysfunction, mtDNA release with cGAS-STING/type I interferon activation, perinatal lethality with pulmonary inflammation, and cardiac failure with impaired SERCA activity [PMID:40200300, PMID:40568929]; the mechanistic connection between its SNARE function and these mitochondrial and cardiomyocyte phenotypes has not been resolved in the available corpus.","teleology":[{"year":2013,"claim":"Established that STX12/STX13 acts in the autophagy pathway, addressing whether this endosomal SNARE contributes to autophagosome maturation rather than only endosomal recycling.","evidence":"siRNA knockdown with LC3/Atg5 puncta imaging and EM in mammalian cells plus a Drosophila genetic modifier screen against ESCRT-III mutant CHMP2B","pmids":["24095276"],"confidence":"High","gaps":["Does not define which partner SNAREs assemble at the phagophore-to-autophagosome step","Molecular relationship to ESCRT-III is genetic, not biochemical"]},{"year":2014,"claim":"Showed STX12-mediated trafficking delivers signaling cargo to invadopodia, linking the SNARE to tumor cell invasion machinery.","evidence":"Reciprocal co-IP, SNARE inhibition, invadopodia and matrix degradation/invasion assays","pmids":["24496451"],"confidence":"Medium","gaps":["Does not identify the vesicle population trafficking Src/EGFR","Single-lab functional study without in vivo validation"]},{"year":2015,"claim":"Defined STX12 as a recycling-endosomal Qa-SNARE that requires VAMP7 and is autoinhibited by its N-terminal domain, establishing the core fusion mechanism in melanosome cargo delivery.","evidence":"siRNA knockdown, live-cell imaging, EM, N-terminal domain-deletion mutagenesis and pigmentation assay in melanocytes","pmids":["26208634"],"confidence":"High","gaps":["Does not resolve the Qbc-SNARE partner in the melanosomal complex","Regulation of the N-terminal autoinhibition in cells not defined"]},{"year":2019,"claim":"Identified post-translational control of STX12 by SGK3 phosphorylation at Ser139, answering how its SNARE assembly and localization are regulated by upstream signaling.","evidence":"Phosphoproteomic screen, in vitro kinase assay, Phos-tag, SGK3 knockout cells and pan-SGK inhibition under IGF1 stimulation","pmids":["31665227"],"confidence":"High","gaps":["Phenotypic consequence of Ser139 phosphorylation on specific trafficking pathways not mapped","Phosphatase reversing the modification unknown"]},{"year":2020,"claim":"Placed STX12 downstream of a mitochondrial-ROS/STAT3/NFE2L1 transcriptional axis, addressing how its expression is controlled in cancer cells.","evidence":"cDNA microarray, NFE2L1 gain/loss of function, ROS measurement, STAT3 inhibition and invasion assay in hepatoma cells","pmids":["32942643"],"confidence":"Medium","gaps":["Direct promoter binding by NFE2L1 not demonstrated","Link between transcriptional induction and SNARE activity unresolved"]},{"year":2021,"claim":"Demonstrated that STX12's endosomal SNARE complex can be competitively inhibited by tSNARE1, defining a regulatory point in early-to-late endosomal trafficking.","evidence":"Biochemical competition for SNARE complex incorporation, live-cell imaging, RNA-seq","pmids":["34642214"],"confidence":"Medium","gaps":["STX12 was supporting data to a tSNARE1-focused study","Full subunit composition of the competed complex not defined"]},{"year":2022,"claim":"Linked STX12 to platelet alpha-granule biogenesis through binding VPS16B/VPS33B, and revealed a hand-off mechanism with the CCC complex coordinating endosomal entry and retrieval.","evidence":"Reciprocal co-IP, Stx12 knockdown/knockout megakaryocytes, EM granule quantification, competitive binding with CCDC22","pmids":["34905616"],"confidence":"High","gaps":["Fusion partner SNAREs in granule biogenesis not enumerated","Structural basis of VPS16B/VPS33B versus CCDC22 competition unknown"]},{"year":2023,"claim":"Showed STX12 is a target of miR-31 in a bacterially driven regulatory loop controlling autophagic flux in colorectal cancer.","evidence":"miR-31 gain/loss, STX12 knockdown, autophagic flux assay, luciferase reporter for direct targeting","pmids":["37216106"],"confidence":"Medium","gaps":["Does not show the trafficking step at which autophagy is blocked","In vivo relevance of the loop not established"]},{"year":2024,"claim":"Revealed pathogen subversion of STX12 trafficking, with the Chlamydia effector IncE recruiting STX12-containing vesicles via an R-SNARE-mimetic linear motif.","evidence":"SLiM mutant analysis, pulldown/binding assays, imaging of vesicle recruitment to the bacterial inclusion","pmids":["39154341"],"confidence":"Medium","gaps":["Functional benefit to the bacterium of STX12 vesicle capture not fully quantified","Whether IncE engages STX12 directly or via the SNARE complex unclear"]},{"year":2025,"claim":"Extended STX12 to additional fusion-dependent processes—galectin secretion, MR1 antigen presentation, and acrosome biogenesis—defining its partner SNAREs and tethering factors in each.","evidence":"SNARE KD/KO and co-IP with galectin-9 secretion assay (STX13-SNAP23-VAMP3); siRNA with MR1 flow cytometry and MAIT activation; co-IP and conditional germ-cell Stx12 KO with acrosome EM (ELAPOR1)","pmids":["40335523","42215548","40737321"],"confidence":"Medium","gaps":["Whether a single endosomal pool serves these diverse pathways is unknown","Regulation distinguishing these pathways not defined"]},{"year":2025,"claim":"Uncovered organismal phenotypes of STX12 loss—mitochondrial dysfunction with cGAS-STING activation, perinatal lethality, and cardiac failure—raising the question of how SNARE activity connects to mitochondrial and cardiomyocyte homeostasis.","evidence":"Stx12 knockout mice and zebrafish depletion with mitochondrial membrane potential, complex subunit blots, interferon qPCR, echocardiography, SERCA activity assay and rapamycin rescue","pmids":["40200300","40568929"],"confidence":"Medium","gaps":["Direct mechanistic link between SNARE fusion activity and mitochondrial integrity not established","Whether cardiac and pulmonary phenotypes are cell-autonomous is unresolved"]},{"year":2026,"claim":"Defined upstream activators and regulators of STX12 SNARE assembly and its endosomal subdomain identity in EV biogenesis, anti-apoptotic signaling, and alpha-granule sorting.","evidence":"Co-IP and SNARE assembly assays with PKM2/SNAP23 perturbation (Coro1a/EV); RIP and STX12 KD with apoptosis readouts and xenografts (SF3A1); co-localization and GRIPAP1 mitochondrial mislocalization with cargo tracking (Rab4a subdomain)","pmids":["42265296","41683622","41632639"],"confidence":"Medium","gaps":["Causal contribution of STX12 fusion to apoptosis resistance not mechanistically dissected","How SNAP23 phosphorylation selectively recruits STX12 is unclear"]},{"year":null,"claim":"It remains unknown how STX12's well-defined endosomal SNARE fusion activity mechanistically produces the mitochondrial dysfunction and cardiomyocyte/cardiac phenotypes seen on its loss.","evidence":"No direct mechanistic experiment in the corpus connects STX12 SNARE function to mitochondrial homeostasis","pmids":[],"confidence":"Medium","gaps":["No demonstrated SNARE-dependent trafficking event upstream of mitochondrial integrity","No structural model of STX12 SNARE complexes across its diverse pathways"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,12,14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,6,12]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,5,13,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,12]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[7,14]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,6,12,14]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,8]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3,13]}],"complexes":["STX13-SNAP23-VAMP3 SNARE complex","STX12-SNAP23-VAMP7 SNARE complex","VAMP4/VTI1A/STX6 SNARE complex"],"partners":["SNAP23","VAMP7","VTI1A","VPS16B","VPS33B","ELAPOR1","VAMP3","SGK3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86Y82","full_name":"Syntaxin-12","aliases":[],"length_aa":276,"mass_kda":31.6,"function":"SNARE promoting fusion of transport vesicles with target membranes. Together with SNARE STX6, promotes movement of vesicles from endosomes to the cell membrane, and may therefore function in the endocytic recycling pathway. Through complex formation with GRIP1, GRIA2 and NSG1 controls the intracellular fate of AMPAR and the endosomal sorting of the GRIA2 subunit toward recycling and membrane targeting","subcellular_location":"Endosome membrane; Golgi apparatus membrane; Endomembrane system; Early endosome membrane; Recycling endosome membrane","url":"https://www.uniprot.org/uniprotkb/Q86Y82/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STX12","classification":"Not Classified","n_dependent_lines":15,"n_total_lines":1208,"dependency_fraction":0.012417218543046357},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000117758","cell_line_id":"CID000084","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"ATP6AP2","stoichiometry":10.0},{"gene":"SCAMP2","stoichiometry":10.0},{"gene":"VAMP3","stoichiometry":10.0},{"gene":"ATP6V0D1","stoichiometry":4.0},{"gene":"NAPA","stoichiometry":4.0},{"gene":"SLC6A15","stoichiometry":4.0},{"gene":"NSF","stoichiometry":4.0},{"gene":"VAMP8","stoichiometry":4.0},{"gene":"VTI1B","stoichiometry":4.0},{"gene":"VAMP3;VAMP2","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000084","total_profiled":1310},"omim":[{"mim_id":"616700","title":"COMM DOMAIN-CONTAINING PROTEIN 3; COMMD3","url":"https://www.omim.org/entry/616700"},{"mim_id":"613401","title":"VPS33B-INTERACTING PROTEIN, APICAL-BASOLATERAL POLARITY REGULATOR, SPE39 HOMOLOG; VIPAS39","url":"https://www.omim.org/entry/613401"},{"mim_id":"606892","title":"SYNTAXIN 12; STX12","url":"https://www.omim.org/entry/606892"},{"mim_id":"604310","title":"BIOGENESIS OF LYSOSOME-RELATED ORGANELLES COMPLEX 1, SUBUNIT 6; BLOC1S6","url":"https://www.omim.org/entry/604310"},{"mim_id":"603217","title":"SYNTAXIN 7; STX7","url":"https://www.omim.org/entry/603217"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Golgi apparatus","reliability":"Enhanced"},{"location":"Vesicles","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STX12"},"hgnc":{"alias_symbol":["STX13","STX14"],"prev_symbol":[]},"alphafold":{"accession":"Q86Y82","domains":[{"cath_id":"1.20.58.70","chopping":"21-152_173-212","consensus_level":"high","plddt":88.4869,"start":21,"end":212}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86Y82","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86Y82-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86Y82-F1-predicted_aligned_error_v6.png","plddt_mean":80.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STX12","jax_strain_url":"https://www.jax.org/strain/search?query=STX12"},"sequence":{"accession":"Q86Y82","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86Y82.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86Y82/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86Y82"}},"corpus_meta":[{"pmid":"11727821","id":"PMC_11727821","title":"Virulence-associated genes in avian pathogenic Escherichia coli (APEC) isolated from internal organs of poultry having died from colibacillosis.","date":"2001","source":"International journal of medical microbiology : IJMM","url":"https://pubmed.ncbi.nlm.nih.gov/11727821","citation_count":119,"is_preprint":false},{"pmid":"26475706","id":"PMC_26475706","title":"Multiple antibiotic resistances among Shiga toxin producing Escherichia coli O157 in feces of dairy cattle farms in Eastern Cape of South Africa.","date":"2015","source":"BMC microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/26475706","citation_count":72,"is_preprint":false},{"pmid":"24095276","id":"PMC_24095276","title":"Syntaxin 13, a genetic modifier of mutant CHMP2B in frontotemporal dementia, is required for autophagosome maturation.","date":"2013","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/24095276","citation_count":61,"is_preprint":false},{"pmid":"24496451","id":"PMC_24496451","title":"SNARE-dependent interaction of Src, EGFR and β1 integrin regulates invadopodia formation and tumor cell invasion.","date":"2014","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/24496451","citation_count":59,"is_preprint":false},{"pmid":"31356066","id":"PMC_31356066","title":"Predictors of Enteric Pathogens in the Domestic Environment from Human and Animal Sources in Rural Bangladesh.","date":"2019","source":"Environmental science & technology","url":"https://pubmed.ncbi.nlm.nih.gov/31356066","citation_count":58,"is_preprint":false},{"pmid":"18937310","id":"PMC_18937310","title":"A comparison of molecular alterations in environmental and genetic rat models of ADHD: a pilot study.","date":"2008","source":"American journal of medical genetics. 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STX13 was present on LC3-positive phagophores and was highly enriched on multilamellar structures induced by dysfunctional ESCRT-III. Loss of STX13 also caused accumulation of Atg5-positive puncta and multilamellar structure formation, suggesting STX13 participates in phagophore-to-autophagosome maturation. Genetically, Drosophila syx13 exhibited strong genetic interaction with mutant CHMP2B (ESCRT-III component).\",\n      \"method\": \"siRNA knockdown in mammalian cells, live-cell imaging (LC3/Atg5 puncta), Drosophila genetic modifier screen, electron microscopy\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in Drosophila plus orthogonal mammalian KD with multiple markers (LC3, Atg5, EM), replicated across two model systems\",\n      \"pmids\": [\"24095276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"STX12 (syntaxin13) and SNAP23 mediate membrane trafficking required for invadopodia formation and tumor cell invasion. The association of Src, EGFR, and β1 integrin at invadopodia is dependent on STX12/SNAP23-mediated traffic. Inhibition of SNARE function impaired delivery of Src and EGFR to developing invadopodia and blocked β1-integrin-dependent Src activation and EGFR phosphorylation (Tyr845). β1 integrin inhibition increased SNAP23–β1 integrin association and reduced STX12–SNAP23 interaction.\",\n      \"method\": \"Co-immunoprecipitation, SNARE inhibition, live-cell imaging of invadopodia, matrix degradation assay, invasion assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and functional invasion assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24496451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"STX13 (STX12), a recycling endosomal Qa-SNARE, is required for cargo delivery to maturing melanosomes. Depletion of STX13 in melanocytes reroutes melanosomal proteins TYR and TYRP1 to lysosomes. Live-cell imaging and EM showed STX13 co-distributes with melanosomal cargo in tubular-vesicular endosomes associated with maturing melanosomes. Deletion of the N-terminal regulatory domain of STX13 increases SNARE activity in vivo and melanosome cargo transport. STX13-dependent cargo transport requires the R-SNARE VAMP7; silencing VAMP7 blocks melanosome maturation, and STX13 and VAMP7 show mutual dependency for their localization.\",\n      \"method\": \"siRNA knockdown, live-cell imaging, electron microscopy, domain-deletion mutagenesis, pigmentation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo mutagenesis + live imaging + EM + functional cargo tracking, multiple orthogonal methods in single study\",\n      \"pmids\": [\"26208634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"STX12 is a substrate of the endosomal kinase SGK3: SGK3 phosphorylates STX12 at Ser139 in vitro and in cells stimulated with IGF1. This phosphorylation is blocked by SGK3 knockout or pan-SGK inhibitor. SGK3 phosphorylation of STX12 enhanced interaction with the VAMP4/VTI1A/STX6-containing SNARE complex and promoted plasma membrane localization of STX12.\",\n      \"method\": \"Phosphoproteomic screen, in vitro kinase assay, Phos-tag analysis, SGK3 knockout cells, pharmacological inhibition\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay plus genetic KO plus pharmacological blockade, multiple orthogonal methods confirming substrate relationship\",\n      \"pmids\": [\"31665227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"STX12 expression is upregulated through a ROS/STAT3/NFE2L1 transcriptional axis downstream of mitochondrial respiratory defects in hepatoma cells. NFE2L1 was identified as a direct transcriptional regulator of STX12 by cDNA microarray after NFE2L1 overexpression/depletion. STX12 functions as a key downstream effector of NFE2L1 modulating hepatoma cell invasiveness.\",\n      \"method\": \"cDNA microarray, NFE2L1 overexpression/depletion, ROS measurement, STAT3 inhibition, invasion assay, immunohistochemistry\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transcriptional target validated by gain/loss-of-function with functional invasiveness readout, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"32942643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"tSNARE1, a schizophrenia-risk protein, competes with STX12 for incorporation into an endosomal SNARE complex, supporting a role for tSNARE1 as an inhibitory SNARE that negatively regulates early-to-late endosomal trafficking in which STX12 participates.\",\n      \"method\": \"Biochemical competition assay (SNARE complex incorporation), live-cell imaging, RNA-sequencing\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical competition assay with live-cell imaging, but the primary focus is tSNARE1; STX12's complex membership is supporting data\",\n      \"pmids\": [\"34642214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"STX12 (Stx12) physically associates with VPS16B/VPS33B and is required for platelet α-granule biogenesis in megakaryocytes. Stx12-deficient megakaryocytes display reduced α-granule numbers and overall α-granule protein levels. CCDC22 (CCC complex) competes with Stx12 for binding to VPS16B/VPS33B, suggesting a hand-off mechanism between endosomal entry (Stx12-mediated fusion) and exit (CCC-mediated retrieval).\",\n      \"method\": \"Co-immunoprecipitation, Stx12 knockdown/knockout in megakaryocytes, α-granule quantification by electron microscopy, competitive binding assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal co-IP, genetic deficiency with EM quantification of organelle number, competitive binding, multiple orthogonal methods\",\n      \"pmids\": [\"34905616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Chlamydia trachomatis effector IncE recruits STX7- and STX12-containing vesicles to the bacterial inclusion via a short linear motif (SLiM) in its cytosolic C-terminus that mimics an R-SNARE motif, binding STX12-containing vesicles to facilitate intracellular bacterial development.\",\n      \"method\": \"SLiM mutant analysis, pulldown/binding assays, fluorescence imaging of vesicle recruitment to inclusion\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis of SLiM plus imaging of vesicle recruitment; STX12 involvement shown as part of broader IncE mechanism, single study\",\n      \"pmids\": [\"39154341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"F. nucleatum infection promotes miR-31 expression in colorectal cancer cells; miR-31 inhibits autophagic flux by targeting STX12. STX12 knockdown phenocopied miR-31 overexpression in blocking autophagy, and STX12, miR-31, and F. nucleatum form a regulatory loop in the autophagy pathway.\",\n      \"method\": \"miR-31 overexpression/knockout, STX12 knockdown, autophagic flux assay (LC3 accumulation), luciferase reporter for miR-31 targeting of STX12\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — miRNA target validation with autophagic flux assay, single lab, functional rescue experiments\",\n      \"pmids\": [\"37216106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STX12 deficiency causes depolarization of mitochondrial membrane potential, reduced mitochondrial complex subunit levels, mitochondrial DNA (mtDNA) release into the cytoplasm, and activation of the cGAS-STING pathway and Type I interferon pathway in lung tissue of Stx12-/- mice. Stx12 knockout mice exhibit perinatal lethality with severe pulmonary inflammation, neutrophil infiltration, and increased cytokines.\",\n      \"method\": \"Stx12 knockout mice, zebrafish Stx12 depletion, mitochondrial membrane potential measurement (JC-1), Western blot for complex subunits, qPCR for interferon genes, immunohistochemistry\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in two model organisms (mice + zebrafish) with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"40200300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STX12 loss in zebrafish and mice causes pericardial edema, cardiac malformations, and heart failure associated with disrupted mitochondrial morphology, reduced iron and zinc, impaired ATP production, and prolonged cardiomyocyte repolarization due to decreased SERCA activity. Rapamycin treatment restores mitochondrial protein expression via TFEB-PGC1α and enhances SERCA activity via CAMKII-phospholamban pathway.\",\n      \"method\": \"Zebrafish morpholino knockdown, mouse Stx12 knockout, echocardiography, mitochondrial morphology EM, ATP measurement, metal quantification, SERCA activity assay, rapamycin treatment\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in two organisms with multiple functional readouts, pharmacological rescue identifies pathway, single lab\",\n      \"pmids\": [\"40568929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELAPOR1, a tethering factor for proacrosomal vesicle fusion during acrosome biogenesis, physically interacts with STX12. Conditional knockout of Stx12 in germ cells resulted in defective acrosome biogenesis similar to Elapor1-/- mice, establishing STX12 as part of the vesicle fusion machinery for acrosome formation.\",\n      \"method\": \"Co-immunoprecipitation, conditional Stx12 knockout in germ cells, acrosome morphology by fluorescence and electron microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and conditional KO with organelle morphology readout, single study\",\n      \"pmids\": [\"40737321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATG9A vesicles fuse with the plasma membrane via an STX13-SNAP23-VAMP3 SNARE complex to secrete galectin-9 and other proteins (galectin-4, galectin-8, annexin A6) in an autophagy-independent unconventional secretion pathway.\",\n      \"method\": \"SNARE knockdown/knockout, co-immunoprecipitation, live-cell imaging of vesicle fusion, galectin-9 secretion assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KD of individual SNARE components with secretion readout and co-IP, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"40335523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STX12 knockdown reduces MR1 antigen presentation of Mycobacterium tuberculosis-derived ligands to MAIT cells in airway epithelial cells. Stx12 blockade increases MR1 surface stabilization and total MR1 expression, indicating that STX12-dependent endosomal trafficking is required for MR1 internalization and antigen loading at sorting endosomes.\",\n      \"method\": \"siRNA-mediated knockdown, MR1 surface expression by flow cytometry, MR1-GFP co-localization imaging, MAIT cell activation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with functional antigen presentation readout and MR1 localization imaging, single lab\",\n      \"pmids\": [\"42215548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Coronin-1a (Coro1a) promotes extracellular vesicle biogenesis by facilitating assembly of the STX12-SNAP23-VAMP7 SNARE complex to drive multivesicular body–plasma membrane fusion. Coro1a activates PKM2 to phosphorylate SNAP23, which recruits STX12 and VAMP7 into the SNARE complex; this effect is abolished by PKM2 inhibition or SNAP23 silencing.\",\n      \"method\": \"Co-immunoprecipitation, SNARE complex assembly assay, PKM2 inhibition, SNAP23 knockdown, EV quantification\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus pharmacological and genetic perturbation with functional EV biogenesis readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"42265296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SF3A1 (splicing factor 3A1) stabilizes STX12 mRNA in colorectal cancer cells; STX12 functions downstream of SF3A1 to inhibit apoptosis. Knockdown of STX12 alone induces apoptosis in CRC cells (but not non-cancerous cells), and SF3A1 knockdown reduces STX12 mRNA levels, establishing an SF3A1–STX12 anti-apoptotic axis in CRC.\",\n      \"method\": \"RNA-immunoprecipitation (RIP), STX12 knockdown, TUNEL staining, PARP cleavage, caspase-3/7 activity, xenograft mouse model\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP validation, genetic KD with multiple apoptosis readouts in vitro and xenograft model, single lab\",\n      \"pmids\": [\"41683622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GRIPAP1, an endosomal tethering factor for platelet α-granule biogenesis, localizes to endosome subdomains decorated by Rab4a and Stx12. Artificial mislocalization of GRIPAP1 to mitochondria was sufficient to recruit Rab4a/Stx12 compartments containing internalized transferrin and newly synthesized PF4 to mitochondria, indicating that Stx12 marks a specific Rab4a-positive endosomal subdomain involved in α-granule cargo sorting.\",\n      \"method\": \"Co-localization imaging, artificial mitochondrial targeting of GRIPAP1, transferrin trafficking assay, PF4 trafficking assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — organelle mislocalization experiment with cargo tracking; STX12 is a co-localizing marker rather than primary subject, single study\",\n      \"pmids\": [\"41632639\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STX12 (also known as STX13) is a recycling/sorting endosomal Qa-SNARE that mediates vesicle fusion at endosomes in concert with partner SNAREs (VAMP7, SNAP23, VAMP3, VTI1A); it is phosphorylated at Ser139 by the endosomal kinase SGK3, which enhances its assembly into SNARE complexes and promotes plasma membrane localization, and it participates in multiple distinct trafficking pathways including phagophore-to-autophagosome maturation, melanosome biogenesis, platelet α-granule biogenesis, invadopodia-dependent tumor invasion, unconventional galectin secretion, MR1-mediated antigen presentation, and acrosome biogenesis, while also playing essential roles in mitochondrial homeostasis and cardiomyocyte function whose mechanistic link to its SNARE activity remains under investigation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STX12 (also called STX13) is a recycling/sorting-endosomal Qa-SNARE that drives membrane fusion across multiple trafficking pathways by assembling with cognate partner SNAREs [#2, #12, #14]. In melanocytes it mediates cargo delivery to maturing melanosomes in partnership with the R-SNARE VAMP7, on which it is mutually dependent for localization; its N-terminal regulatory domain restrains SNARE activity, and deleting that domain enhances both complex assembly and cargo transport [#2]. STX12 is phosphorylated at Ser139 by the endosomal kinase SGK3, which strengthens its incorporation into VAMP4/VTI1A/STX6-containing SNARE complexes and promotes its plasma-membrane localization [#3]. Through these fusion activities STX12 supports autophagosome maturation, where its loss blocks autophagic flux and accumulates LC3/Atg5 puncta in cooperation with Vti1a and the ESCRT-III machinery [#0], and contributes to organelle biogenesis programs including platelet alpha-granule formation via binding to VPS16B/VPS33B [#6], acrosome biogenesis via the tethering factor ELAPOR1 [#11], unconventional galectin secretion through an STX13-SNAP23-VAMP3 complex on ATG9A vesicles [#12], and MR1-mediated antigen presentation at sorting endosomes [#13]. STX12-dependent trafficking is also exploited by pathogens, as the Chlamydia effector IncE recruits STX12-containing vesicles via an R-SNARE-mimetic motif [#7], and it promotes invadopodia-dependent tumor invasion by delivering Src and EGFR to invadopodia together with SNAP23 [#1]. Genetic loss of STX12 in mice and zebrafish causes mitochondrial dysfunction, mtDNA release with cGAS-STING/type I interferon activation, perinatal lethality with pulmonary inflammation, and cardiac failure with impaired SERCA activity [#9, #10]; the mechanistic connection between its SNARE function and these mitochondrial and cardiomyocyte phenotypes has not been resolved in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that STX12/STX13 acts in the autophagy pathway, addressing whether this endosomal SNARE contributes to autophagosome maturation rather than only endosomal recycling.\",\n      \"evidence\": \"siRNA knockdown with LC3/Atg5 puncta imaging and EM in mammalian cells plus a Drosophila genetic modifier screen against ESCRT-III mutant CHMP2B\",\n      \"pmids\": [\"24095276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define which partner SNAREs assemble at the phagophore-to-autophagosome step\", \"Molecular relationship to ESCRT-III is genetic, not biochemical\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed STX12-mediated trafficking delivers signaling cargo to invadopodia, linking the SNARE to tumor cell invasion machinery.\",\n      \"evidence\": \"Reciprocal co-IP, SNARE inhibition, invadopodia and matrix degradation/invasion assays\",\n      \"pmids\": [\"24496451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not identify the vesicle population trafficking Src/EGFR\", \"Single-lab functional study without in vivo validation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined STX12 as a recycling-endosomal Qa-SNARE that requires VAMP7 and is autoinhibited by its N-terminal domain, establishing the core fusion mechanism in melanosome cargo delivery.\",\n      \"evidence\": \"siRNA knockdown, live-cell imaging, EM, N-terminal domain-deletion mutagenesis and pigmentation assay in melanocytes\",\n      \"pmids\": [\"26208634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve the Qbc-SNARE partner in the melanosomal complex\", \"Regulation of the N-terminal autoinhibition in cells not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified post-translational control of STX12 by SGK3 phosphorylation at Ser139, answering how its SNARE assembly and localization are regulated by upstream signaling.\",\n      \"evidence\": \"Phosphoproteomic screen, in vitro kinase assay, Phos-tag, SGK3 knockout cells and pan-SGK inhibition under IGF1 stimulation\",\n      \"pmids\": [\"31665227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phenotypic consequence of Ser139 phosphorylation on specific trafficking pathways not mapped\", \"Phosphatase reversing the modification unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed STX12 downstream of a mitochondrial-ROS/STAT3/NFE2L1 transcriptional axis, addressing how its expression is controlled in cancer cells.\",\n      \"evidence\": \"cDNA microarray, NFE2L1 gain/loss of function, ROS measurement, STAT3 inhibition and invasion assay in hepatoma cells\",\n      \"pmids\": [\"32942643\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding by NFE2L1 not demonstrated\", \"Link between transcriptional induction and SNARE activity unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated that STX12's endosomal SNARE complex can be competitively inhibited by tSNARE1, defining a regulatory point in early-to-late endosomal trafficking.\",\n      \"evidence\": \"Biochemical competition for SNARE complex incorporation, live-cell imaging, RNA-seq\",\n      \"pmids\": [\"34642214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"STX12 was supporting data to a tSNARE1-focused study\", \"Full subunit composition of the competed complex not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked STX12 to platelet alpha-granule biogenesis through binding VPS16B/VPS33B, and revealed a hand-off mechanism with the CCC complex coordinating endosomal entry and retrieval.\",\n      \"evidence\": \"Reciprocal co-IP, Stx12 knockdown/knockout megakaryocytes, EM granule quantification, competitive binding with CCDC22\",\n      \"pmids\": [\"34905616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Fusion partner SNAREs in granule biogenesis not enumerated\", \"Structural basis of VPS16B/VPS33B versus CCDC22 competition unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed STX12 is a target of miR-31 in a bacterially driven regulatory loop controlling autophagic flux in colorectal cancer.\",\n      \"evidence\": \"miR-31 gain/loss, STX12 knockdown, autophagic flux assay, luciferase reporter for direct targeting\",\n      \"pmids\": [\"37216106\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not show the trafficking step at which autophagy is blocked\", \"In vivo relevance of the loop not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed pathogen subversion of STX12 trafficking, with the Chlamydia effector IncE recruiting STX12-containing vesicles via an R-SNARE-mimetic linear motif.\",\n      \"evidence\": \"SLiM mutant analysis, pulldown/binding assays, imaging of vesicle recruitment to the bacterial inclusion\",\n      \"pmids\": [\"39154341\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional benefit to the bacterium of STX12 vesicle capture not fully quantified\", \"Whether IncE engages STX12 directly or via the SNARE complex unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended STX12 to additional fusion-dependent processes—galectin secretion, MR1 antigen presentation, and acrosome biogenesis—defining its partner SNAREs and tethering factors in each.\",\n      \"evidence\": \"SNARE KD/KO and co-IP with galectin-9 secretion assay (STX13-SNAP23-VAMP3); siRNA with MR1 flow cytometry and MAIT activation; co-IP and conditional germ-cell Stx12 KO with acrosome EM (ELAPOR1)\",\n      \"pmids\": [\"40335523\", \"42215548\", \"40737321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether a single endosomal pool serves these diverse pathways is unknown\", \"Regulation distinguishing these pathways not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Uncovered organismal phenotypes of STX12 loss—mitochondrial dysfunction with cGAS-STING activation, perinatal lethality, and cardiac failure—raising the question of how SNARE activity connects to mitochondrial and cardiomyocyte homeostasis.\",\n      \"evidence\": \"Stx12 knockout mice and zebrafish depletion with mitochondrial membrane potential, complex subunit blots, interferon qPCR, echocardiography, SERCA activity assay and rapamycin rescue\",\n      \"pmids\": [\"40200300\", \"40568929\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanistic link between SNARE fusion activity and mitochondrial integrity not established\", \"Whether cardiac and pulmonary phenotypes are cell-autonomous is unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined upstream activators and regulators of STX12 SNARE assembly and its endosomal subdomain identity in EV biogenesis, anti-apoptotic signaling, and alpha-granule sorting.\",\n      \"evidence\": \"Co-IP and SNARE assembly assays with PKM2/SNAP23 perturbation (Coro1a/EV); RIP and STX12 KD with apoptosis readouts and xenografts (SF3A1); co-localization and GRIPAP1 mitochondrial mislocalization with cargo tracking (Rab4a subdomain)\",\n      \"pmids\": [\"42265296\", \"41683622\", \"41632639\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal contribution of STX12 fusion to apoptosis resistance not mechanistically dissected\", \"How SNAP23 phosphorylation selectively recruits STX12 is unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how STX12's well-defined endosomal SNARE fusion activity mechanistically produces the mitochondrial dysfunction and cardiomyocyte/cardiac phenotypes seen on its loss.\",\n      \"evidence\": \"No direct mechanistic experiment in the corpus connects STX12 SNARE function to mitochondrial homeostasis\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No demonstrated SNARE-dependent trafficking event upstream of mitochondrial integrity\", \"No structural model of STX12 SNARE complexes across its diverse pathways\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 12, 14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 6, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 5, 13, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [7, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 6, 12, 14]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3, 13]}\n    ],\n    \"complexes\": [\n      \"STX13-SNAP23-VAMP3 SNARE complex\",\n      \"STX12-SNAP23-VAMP7 SNARE complex\",\n      \"VAMP4/VTI1A/STX6 SNARE complex\"\n    ],\n    \"partners\": [\n      \"SNAP23\",\n      \"VAMP7\",\n      \"VTI1A\",\n      \"VPS16B\",\n      \"VPS33B\",\n      \"ELAPOR1\",\n      \"VAMP3\",\n      \"SGK3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}