{"gene":"SYTL1","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":2001,"finding":"JFC1/SYTL1 was identified as a novel tandem C2 domain-containing protein that associates with p67(phox) of the leukocyte NADPH oxidase complex; JFC1 binds p67(phox) but not p47(phox) directly, acting as an adaptor between PI3K products and the oxidase cytosolic complex. JFC1 binds phosphatidylinositol 3,4,5-trisphosphate and phosphatidylinositol 3,4-diphosphate but not inositol 1,3,4,5-tetrakisphosphate, and is restricted to the plasma membrane/secretory vesicle fraction in neutrophils.","method":"Yeast two-hybrid screen, affinity chromatography pulldown, subcellular fractionation, lipid-binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal pulldown with recombinant proteins and fractionation, moderate evidence","pmids":["11278853"],"is_preprint":false},{"year":2001,"finding":"JFC1/SYTL1 is an ATP-binding protein with magnesium-dependent ATPase activity; it specifically binds ATP analog 8-azido-ATP, hydrolyzes ATP and dATP with Km ~58 µM and kcat 2.27/min, and contains a nucleotide-binding site with unique characteristics distinct from GHKL ATPase/kinase superfamily. PIP3 binding does not affect ATPase kinetics.","method":"In vitro ATPase assay, photoaffinity labeling with 8-azido-[α-32P]ATP, truncation mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical assay with mutagenesis and kinetic characterization","pmids":["11553774"],"is_preprint":false},{"year":2002,"finding":"The C2A domain of JFC1/SYTL1 is solely responsible for binding 3'-phosphorylated phosphoinositides (PIP3) and directing plasma membrane localization in living cells; the C2A domain colocalizes with the PH domain of Akt in vivo, dissociates from membrane upon PI3K inhibition, and its membrane association is modulated by calcium.","method":"Live-cell imaging with GFP-tagged domain constructs, PI3K inhibitor treatment, co-localization with Akt PH domain, lipid-binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo domain localization with pharmacological and lipid-binding validation, multiple orthogonal methods","pmids":["12189202"],"is_preprint":false},{"year":2002,"finding":"The JFC1/SYTL1 promoter contains three functional NF-κB binding sites; NF-κB p50 and p65 bind these sites and transactivate JFC1 expression, and TNFα upregulates JFC1 expression in prostate carcinoma cells through this NF-κB pathway.","method":"Gel retardation/EMSA, supershift assay, luciferase reporter assay, promoter mutagenesis, dominant-negative IκB expression","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including EMSA, supershift, reporter assay with mutagenesis","pmids":["12137562"],"is_preprint":false},{"year":2005,"finding":"JFC1/SYTL1 is phosphorylated by Akt at serine 241; Akt-mediated phosphorylation of JFC1 causes its dissociation from the plasma membrane and redistribution to the cytosol without disrupting the JFC1-Rab27a interaction. JFC1 binding to Rab27a (dependent on W83 of JFC1) reduces Akt phosphorylation of JFC1.","method":"In vitro kinase assay with constitutively active Akt, mass spectrometry phosphosite identification, site-directed mutagenesis (S241A, W83S), immunoprecipitation, PI3K inhibitor (LY294002) treatment, subcellular localization by immunofluorescence","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay + MS phosphosite ID + mutagenesis + localization, multiple orthogonal methods","pmids":["15998322"],"is_preprint":false},{"year":2005,"finding":"JFC1/SYTL1 (a Rab27a- and PIP3-binding protein) regulates androgen-dependent secretion of prostatic-specific acid phosphatase (PSAP) but not PSA from LNCaP prostate cells; JFC1 co-localizes with PSAP but not PSA in prostate granules, and both Rab27a and PI3K are required for exocytosis of prostate-specific secretory markers.","method":"Dominant-negative C2A domain overexpression, JFC1 overexpression, immunofluorescence colocalization, PI3K inhibitor treatment, constitutively active Rab27aQ78L expression, secretion assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function, gain-of-function, and colocalization with defined secretory phenotype","pmids":["16004602"],"is_preprint":false},{"year":2008,"finding":"JFC1/SYTL1 and Munc13-4 are Rab27a effectors that regulate exocytosis of distinct neutrophil granule subsets; JFC1 co-localizes with Rab27a in predocked/docked vesicles and specifically regulates azurophilic granule (myeloperoxidase) exocytosis, while Munc13-4 regulates gelatinase B (gelatinase granule) secretion.","method":"siRNA knockdown, TIRF microscopy, immunofluorescence, genetically modified mice (Munc13-4-deficient Jinx mice), secretion assay for myeloperoxidase and gelatinase B","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 — siRNA KD and KO mouse model with specific secretory phenotype readout, replicated for multiple granule types","pmids":["18939952"],"is_preprint":false},{"year":2008,"finding":"Slp1/JFC1 and Slp2-a are expressed in cytotoxic T lymphocytes (CTLs), both interact with Rab27a, and both localize predominantly to the plasma membrane of human and mouse CTLs. Slp2-a but not Slp1 is rapidly degraded when Rab27a is absent (due to PEST-like sequences in Slp2-a). Dominant-negative SHD of Slp2-a (56% identical to Slp1 SHD) reduces CTL killing, indicating both contribute to secretory lysosome exocytosis from CTL.","method":"Expression screening, co-immunoprecipitation with Rab27a, immunofluorescence localization in CTLs, dominant-negative overexpression, cytotoxicity assay","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP, localization, and dominant-negative functional assay, single lab","pmids":["18266782"],"is_preprint":false},{"year":2008,"finding":"Slp1/JFC1 is abundantly expressed in pancreatic acinar cells, interacts with Rab27B in vivo, co-localizes with Rab27B on zymogen granules, and Slp1 knockout mice show increased numbers of zymogen granules, indicating Slp1 is part of the amylase secretion machinery of the exocrine pancreas.","method":"Immunohistochemistry/immunofluorescence, co-immunoprecipitation, Slp1 knockout mouse analysis, morphological analysis","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and KO mouse with defined secretory phenotype, single lab","pmids":["18477466"],"is_preprint":false},{"year":2012,"finding":"JFC1/SYTL1 associates with the RhoA-GAP protein GMIP (Gem-interacting protein); GMIP downregulation induces RhoA activation and actin polymerization that impairs vesicular transport and exocytosis. JFC1-containing secretory organelles move in actin-free areas near the plasma membrane, and JFC1-knockout neutrophils show increased RhoA activity with azurophilic granules unable to traverse cortical actin.","method":"Proteomic/mass spectrometry identification, live-cell quantitative microscopy, JFC1 knockout neutrophils, RhoA activity assay, siRNA knockdown of GMIP, actin visualization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — proteomic identification confirmed by KO cells, live imaging, and RhoA activity assay with defined trafficking phenotype","pmids":["22438581"],"is_preprint":false},{"year":2012,"finding":"EPI64 (a TBC-domain RabGAP protein) directly binds to a C-terminal region of JFC1/SYTL1; JFC1 is an effector for Rab8a, and EPI64 recruits Rab8a-GTP via JFC1 for deactivation by EPI64's RabGAP activity, thereby regulating Arf6-dependent membrane trafficking. Mutations that uncouple JFC1 from either EPI64 or Rab8-GTP disrupt vacuole formation phenotype.","method":"Co-localization, direct binding assay, mutant analysis (RabGAP-dead EPI64, JFC1 uncoupling mutants), co-expression studies, Rab8-GTP level measurement","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — direct binding, multiple mutant analyses, and functional epistasis with defined phenotypic readout","pmids":["22219378"],"is_preprint":false},{"year":2019,"finding":"JFC1/SYTL1 controls Rac1-GTP recycling from the neutrophil uropod to promote directional migration; JFC1-null neutrophils show Rac1-GTP accumulation at the uropod and impaired chemotaxis in vitro and in vivo. JFC1 interacts with Rac1-GTP in a Rab27a-independent manner at dynamic vesicles, and STORM super-resolution microscopy shows adjacent distribution of JFC1 and Rac1-GTP that increases upon activation.","method":"JFC1-null mice, live-cell microscopy, STORM super-resolution microscopy, co-immunoprecipitation (Rac1-GTP and JFC1), in vivo bone marrow chimera neutrophil migration assay, chemotaxis assay, Rac1-GTP localization analysis","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 — KO mice with in vivo migration assay, co-IP, super-resolution microscopy, multiple orthogonal methods","pmids":["30748033"],"is_preprint":false},{"year":2023,"finding":"LincRNA01703 enhances the interaction between Rab27a, SYTL1/JFC1, and CD81 to promote secretion of CD81+ exosomes; this complex formation suppresses immune cell infiltration in the tumor microenvironment to inhibit lung adenocarcinoma metastasis.","method":"In vivo metastasis assay, co-immunoprecipitation, exosome secretion assay, lncRNA overexpression/knockdown","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP showing complex formation, functional in vivo assay, single lab","pmids":["38136327"],"is_preprint":false},{"year":2023,"finding":"WTAP (m6A writer) promotes YTHDF2-mediated m6A methylation and degradation of SYTL1 mRNA, reducing SYTL1 protein levels in bladder cancer cells and impairing NK cell anti-tumor activity.","method":"RIP-qPCR, actinomycin D mRNA stability assay, western blot, RT-qPCR, in vivo tumor model","journal":"Histology and histopathology","confidence":"Medium","confidence_rationale":"Tier 2-3 — RIP-qPCR demonstrating m6A reader binding to SYTL1 mRNA, mRNA stability assay, multiple methods","pmids":["37933909"],"is_preprint":false},{"year":2022,"finding":"ELK1 recruits HDAC2 to the SYTL1 promoter to repress SYTL1 transcription; ELK1 and HDAC2 form a complex that specifically binds the SYTL1 promoter, suppressing SYTL1 expression and promoting bladder cancer malignant phenotype.","method":"ChIP assay, co-immunoprecipitation, luciferase reporter assay, siRNA knockdown of ELK1/HDAC2, in vitro and in vivo tumor assays","journal":"Human cell","confidence":"Medium","confidence_rationale":"Tier 2-3 — ChIP demonstrating direct promoter binding, co-IP for complex, and functional rescue experiment","pmids":["36107384"],"is_preprint":false},{"year":2023,"finding":"Rab27a effector JFC1/SYTL1 localizes to Anaplasma phagocytophilum inclusions via its C2A domain binding 3'-phosphoinositides (PI3P enriched in inclusion membrane), mediating docking/fusion of Rab27a-bearing granules with inclusions to promote bacterial proliferation; blocking Rab27a-JFC1 interaction with Nexinhib20 inhibits Anaplasma infection.","method":"shRNA knockdown, live-cell imaging, immunostaining, dominant-negative C2A domain expression, small-molecule inhibitor (Nexinhib20), infection assay","journal":"Microbes and infection","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD, dominant-negative, pharmacological inhibition with defined infectious phenotype, single lab","pmids":["38110148"],"is_preprint":false},{"year":2025,"finding":"Nexinhib20 inhibits JFC1-mediated mobilization of a subset of CD11b+ granules to the plasma membrane, reducing β2-integrin avidity; this effect is JFC1-dependent but Rac1-independent, confirmed by JFC1-KO neutrophils and direct measurement of Rac1 activation by FRET-based assay and Rac1-PAK1 binding assay.","method":"JFC1-KO mice, Nexinhib20 small-molecule inhibitor, quantitative 3D super-resolution microscopy, FRET-based Rac1 activity assay, Rac1-PAK1 binding assay, flow cytometry","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 — KO mouse + small-molecule inhibitor + multiple orthogonal Rac1 activity assays + super-resolution microscopy","pmids":["39883854"],"is_preprint":false}],"current_model":"JFC1/SYTL1 is a Rab27a effector protein with tandem C2 domains that functions as a vesicular trafficking regulator: its C2A domain binds 3'-phosphoinositides (PIP3) to direct plasma membrane localization, its SHD domain binds active Rab27a to mediate docking/priming of secretory granules (particularly azurophilic granules in neutrophils), it associates with the RhoA-GAP GMIP to facilitate cortical actin traversal during exocytosis, and it regulates directional neutrophil migration by controlling Rac1-GTP recycling from the uropod; additionally, JFC1 has intrinsic magnesium-dependent ATPase activity, is phosphorylated by Akt at S241 causing membrane dissociation, and its transcription is activated by NF-κB and repressed by an ELK1/HDAC2 complex."},"narrative":{"teleology":[{"year":2001,"claim":"Identification of JFC1/SYTL1 as a novel tandem C2 domain protein that binds 3'-phosphoinositides and associates with the NADPH oxidase component p67phox established it as a PI3K-regulated adaptor in neutrophils.","evidence":"Yeast two-hybrid screen, recombinant pulldown, lipid-binding assay, and subcellular fractionation in neutrophils","pmids":["11278853"],"confidence":"High","gaps":["Physiological significance of p67phox interaction for oxidase assembly not tested in intact cells","Whether JFC1 directly activates the oxidase or merely scaffolds remains unresolved"]},{"year":2001,"claim":"Demonstrating that JFC1 possesses intrinsic Mg²⁺-dependent ATPase activity with defined kinetics revealed an unexpected enzymatic function for a trafficking adaptor, distinct from known ATPase superfamilies.","evidence":"In vitro ATPase assay with recombinant protein, photoaffinity labeling with 8-azido-ATP, truncation mutagenesis","pmids":["11553774"],"confidence":"High","gaps":["Biological role of ATPase activity in vesicular trafficking not determined","No structural model of the nucleotide-binding site","No in vivo mutagenesis of ATPase site to test functional significance"]},{"year":2002,"claim":"Mapping the C2A domain as the sole PIP3-binding and plasma membrane-targeting module, and identifying NF-κB-dependent transcriptional activation, defined both the membrane-targeting mechanism and an inflammatory signaling input for SYTL1 expression.","evidence":"Live-cell imaging of GFP-tagged domains with PI3K inhibitor, colocalization with Akt-PH domain; EMSA/supershift, luciferase reporter, and promoter mutagenesis in prostate carcinoma cells","pmids":["12189202","12137562"],"confidence":"High","gaps":["Contribution of calcium to C2A membrane association in physiological settings not fully resolved","Whether NF-κB-driven upregulation is relevant in primary neutrophils versus carcinoma cells"]},{"year":2005,"claim":"Showing that Akt phosphorylates JFC1 at S241 to drive membrane dissociation, while Rab27a binding antagonizes this phosphorylation, revealed a regulatory switch coordinating PI3K signaling with Rab27a-dependent vesicle docking.","evidence":"In vitro kinase assay, mass spectrometry phosphosite mapping, S241A and W83S mutagenesis, immunofluorescence localization, PI3K inhibitor treatment","pmids":["15998322"],"confidence":"High","gaps":["Temporal dynamics of Akt phosphorylation during stimulus-coupled exocytosis not resolved","No phospho-specific antibody validated in primary cells"]},{"year":2005,"claim":"Demonstrating that JFC1 selectively regulates androgen-dependent secretion of prostatic-specific acid phosphatase but not PSA in prostate cells established cargo-selective exocytic function downstream of Rab27a and PI3K.","evidence":"Dominant-negative C2A overexpression, JFC1 overexpression, immunofluorescence colocalization, secretion assay in LNCaP cells","pmids":["16004602"],"confidence":"High","gaps":["Mechanism of cargo selectivity between PSAP and PSA granules not identified","Relevance to prostate physiology in vivo not tested"]},{"year":2008,"claim":"Defining JFC1 as a Rab27a effector that specifically controls azurophilic granule exocytosis in neutrophils (distinct from Munc13-4's control of gelatinase granules) and demonstrating its expression and Rab27a/Rab27B interaction in CTLs and pancreatic acinar cells broadened SYTL1's role to a general secretory granule regulator across cell types.","evidence":"siRNA knockdown and TIRF microscopy in neutrophils; Munc13-4-KO Jinx mice; co-IP and Slp1-KO mouse analysis of pancreatic zymogen granules; co-IP and localization in CTLs","pmids":["18939952","18477466","18266782"],"confidence":"High","gaps":["Mechanism of granule subtype specificity (azurophilic vs. gelatinase) not molecularly defined","Slp1-KO pancreatic secretion was not functionally measured (only granule accumulation shown)"]},{"year":2012,"claim":"Identifying GMIP as a JFC1-associated RhoA-GAP that creates actin-free corridors for granule transit, and separately showing JFC1 scaffolds Rab8a for deactivation by EPI64, established JFC1 as a multi-Rab effector that coordinates actin remodeling with membrane trafficking.","evidence":"Proteomic identification of GMIP, JFC1-KO neutrophils with RhoA activity assay and live imaging; direct binding assay of JFC1–EPI64, Rab8a-GTP measurement, mutant epistasis","pmids":["22438581","22219378"],"confidence":"High","gaps":["Whether GMIP and EPI64 pathways operate in the same cell type simultaneously is unknown","Structural basis of JFC1 engagement with multiple Rab partners not determined"]},{"year":2019,"claim":"Revealing that JFC1 controls Rac1-GTP recycling from the neutrophil uropod to enable directional chemotaxis—independently of Rab27a—uncovered a migration-specific function distinct from its exocytic role.","evidence":"JFC1-null mice with in vivo bone marrow chimera migration assay, co-IP of JFC1 with Rac1-GTP, STORM super-resolution microscopy","pmids":["30748033"],"confidence":"High","gaps":["Molecular mechanism by which JFC1 extracts or recycles Rac1-GTP from uropod membranes is unknown","Whether other Slp-family members compensate in JFC1-null cells for migration"]},{"year":2022,"claim":"Identification of ELK1–HDAC2-mediated transcriptional repression of SYTL1, and WTAP/YTHDF2-mediated m6A-dependent mRNA degradation, defined two layers of negative regulation of SYTL1 expression relevant to bladder cancer.","evidence":"ChIP, co-IP, luciferase reporter for ELK1–HDAC2; RIP-qPCR and mRNA stability assay for m6A regulation","pmids":["36107384","37933909"],"confidence":"Medium","gaps":["Direct functional consequence of restoring SYTL1 in bladder cancer on vesicular trafficking not tested","Whether these regulatory mechanisms operate in immune cells is unknown"]},{"year":2023,"claim":"Demonstrating that SYTL1 localizes to Anaplasma phagocytophilum inclusions via C2A-PI3P binding to deliver Rab27a+ granules for bacterial benefit, and that lincRNA01703 enhances Rab27a–SYTL1–CD81 complex formation for exosome secretion, expanded SYTL1's roles to pathogen exploitation and tumor-derived exosome biogenesis.","evidence":"shRNA knockdown, dominant-negative C2A, Nexinhib20 inhibitor in A. phagocytophilum infection model; co-IP and exosome secretion assay for lincRNA01703–Rab27a–JFC1–CD81 in lung adenocarcinoma","pmids":["38110148","38136327"],"confidence":"Medium","gaps":["Whether pathogen-directed JFC1 utilization occurs in vivo during anaplasmosis is untested","Mechanism by which lincRNA01703 enhances ternary complex formation is unclear"]},{"year":2025,"claim":"Showing that Nexinhib20 inhibits JFC1-dependent mobilization of CD11b+ granules and β2-integrin avidity in a JFC1-dependent but Rac1-independent manner clarified that JFC1's integrin-mobilization and migration functions are mechanistically separable.","evidence":"JFC1-KO mice, Nexinhib20 treatment, quantitative 3D super-resolution microscopy, FRET-based Rac1 activity assay, flow cytometry","pmids":["39883854"],"confidence":"High","gaps":["Precise molecular target of Nexinhib20 on JFC1 not structurally defined","In vivo therapeutic efficacy of Nexinhib20 in inflammatory disease models not established"]},{"year":null,"claim":"The biological function of JFC1's intrinsic ATPase activity, the structural basis for its engagement with multiple Rab GTPases and Rac1, and whether its trafficking and migration functions are coordinated or independently regulated in vivo remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of full-length SYTL1 or its complexes","ATPase activity has no assigned in vivo function","Relative contributions of SYTL1 to exocytosis versus migration in immune defense in vivo not dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,2]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,10,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,4,7]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,6,11,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[5,6,8,9,10,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,11,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,9,11]}],"complexes":[],"partners":["RAB27A","GMIP","TBC1D10A","RAB8A","RAC1","NFKB1","CD81"],"other_free_text":[]},"mechanistic_narrative":"SYTL1 (JFC1/Slp1) is a tandem C2 domain-containing Rab27a/Rab27B effector that orchestrates vesicular trafficking, regulated exocytosis, and cell migration in hematopoietic and secretory cell types. Its C2A domain binds 3'-phosphoinositides (PI(3,4,5)P3 and PI(3,4)P2) to direct plasma membrane and secretory vesicle localization, while its SHD domain engages GTP-bound Rab27a to dock secretory granules—particularly azurophilic granules in neutrophils and zymogen granules in pancreatic acinar cells—for exocytic fusion [PMID:12189202, PMID:18939952, PMID:18477466]. SYTL1 recruits the RhoA-GAP GMIP to locally inactivate RhoA and create actin-free corridors that permit granule transit through cortical actin, and independently controls directional neutrophil migration by recycling Rac1-GTP from the uropod via a Rab27a-independent interaction [PMID:22438581, PMID:30748033]. SYTL1 also possesses intrinsic Mg²⁺-dependent ATPase activity, is phosphorylated by Akt at S241 causing membrane dissociation, serves as a scaffold linking Rab8a to the RabGAP EPI64 in Arf6-dependent trafficking, and its transcription is positively regulated by NF-κB and repressed by an ELK1–HDAC2 complex [PMID:11553774, PMID:15998322, PMID:22219378, PMID:12137562, PMID:36107384]."},"prefetch_data":{"uniprot":{"accession":"Q8IYJ3","full_name":"Synaptotagmin-like protein 1","aliases":["Exophilin-7","Protein JFC1"],"length_aa":562,"mass_kda":61.9,"function":"May play a role in vesicle trafficking (By similarity). Binds phosphatidylinositol 3,4,5-trisphosphate. Acts as a RAB27A effector protein and may play a role in cytotoxic granule exocytosis in lymphocytes (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q8IYJ3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SYTL1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SYTL1","total_profiled":1310},"omim":[{"mim_id":"611790","title":"MYOSIN VIIA- AND RAB-INTERACTING PROTEIN; MYRIP","url":"https://www.omim.org/entry/611790"},{"mim_id":"608042","title":"SYNAPTOTAGMIN-LIKE 1; SYTL1","url":"https://www.omim.org/entry/608042"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":98.8},{"tissue":"pancreas","ntpm":101.4}],"url":"https://www.proteinatlas.org/search/SYTL1"},"hgnc":{"alias_symbol":["SLP1","JFC1","FLJ14996","exophilin-7"],"prev_symbol":[]},"alphafold":{"accession":"Q8IYJ3","domains":[{"cath_id":"2.60.40.150","chopping":"270-385","consensus_level":"high","plddt":92.1505,"start":270,"end":385},{"cath_id":"2.60.40.150","chopping":"399-556","consensus_level":"high","plddt":91.1777,"start":399,"end":556}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYJ3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYJ3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYJ3-F1-predicted_aligned_error_v6.png","plddt_mean":72.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SYTL1","jax_strain_url":"https://www.jax.org/strain/search?query=SYTL1"},"sequence":{"accession":"Q8IYJ3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IYJ3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IYJ3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYJ3"}},"corpus_meta":[{"pmid":"9461438","id":"PMC_9461438","title":"Fission yeast Slp1: an effector of the Mad2-dependent spindle checkpoint.","date":"1998","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/9461438","citation_count":321,"is_preprint":false},{"pmid":"9353311","id":"PMC_9353311","title":"Cell cycle-regulated expression, phosphorylation, and degradation of p55Cdc. A mammalian homolog of CDC20/Fizzy/slp1.","date":"1997","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9353311","citation_count":120,"is_preprint":false},{"pmid":"2183024","id":"PMC_2183024","title":"The SLP1 gene of Saccharomyces cerevisiae is essential for vacuolar morphogenesis and function.","date":"1990","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/2183024","citation_count":111,"is_preprint":false},{"pmid":"22438581","id":"PMC_22438581","title":"Vesicular trafficking through cortical actin during exocytosis is regulated by the Rab27a effector JFC1/Slp1 and the RhoA-GTPase-activating protein Gem-interacting protein.","date":"2012","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/22438581","citation_count":83,"is_preprint":false},{"pmid":"18266782","id":"PMC_18266782","title":"Slp1 and Slp2-a localize to the plasma membrane of CTL and contribute to secretion from the 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JFC1 binds phosphatidylinositol 3,4,5-trisphosphate and phosphatidylinositol 3,4-diphosphate but not inositol 1,3,4,5-tetrakisphosphate, and is restricted to the plasma membrane/secretory vesicle fraction in neutrophils.\",\n      \"method\": \"Yeast two-hybrid screen, affinity chromatography pulldown, subcellular fractionation, lipid-binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal pulldown with recombinant proteins and fractionation, moderate evidence\",\n      \"pmids\": [\"11278853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"JFC1/SYTL1 is an ATP-binding protein with magnesium-dependent ATPase activity; it specifically binds ATP analog 8-azido-ATP, hydrolyzes ATP and dATP with Km ~58 µM and kcat 2.27/min, and contains a nucleotide-binding site with unique characteristics distinct from GHKL ATPase/kinase superfamily. PIP3 binding does not affect ATPase kinetics.\",\n      \"method\": \"In vitro ATPase assay, photoaffinity labeling with 8-azido-[α-32P]ATP, truncation mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assay with mutagenesis and kinetic characterization\",\n      \"pmids\": [\"11553774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The C2A domain of JFC1/SYTL1 is solely responsible for binding 3'-phosphorylated phosphoinositides (PIP3) and directing plasma membrane localization in living cells; the C2A domain colocalizes with the PH domain of Akt in vivo, dissociates from membrane upon PI3K inhibition, and its membrane association is modulated by calcium.\",\n      \"method\": \"Live-cell imaging with GFP-tagged domain constructs, PI3K inhibitor treatment, co-localization with Akt PH domain, lipid-binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo domain localization with pharmacological and lipid-binding validation, multiple orthogonal methods\",\n      \"pmids\": [\"12189202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The JFC1/SYTL1 promoter contains three functional NF-κB binding sites; NF-κB p50 and p65 bind these sites and transactivate JFC1 expression, and TNFα upregulates JFC1 expression in prostate carcinoma cells through this NF-κB pathway.\",\n      \"method\": \"Gel retardation/EMSA, supershift assay, luciferase reporter assay, promoter mutagenesis, dominant-negative IκB expression\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including EMSA, supershift, reporter assay with mutagenesis\",\n      \"pmids\": [\"12137562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"JFC1/SYTL1 is phosphorylated by Akt at serine 241; Akt-mediated phosphorylation of JFC1 causes its dissociation from the plasma membrane and redistribution to the cytosol without disrupting the JFC1-Rab27a interaction. JFC1 binding to Rab27a (dependent on W83 of JFC1) reduces Akt phosphorylation of JFC1.\",\n      \"method\": \"In vitro kinase assay with constitutively active Akt, mass spectrometry phosphosite identification, site-directed mutagenesis (S241A, W83S), immunoprecipitation, PI3K inhibitor (LY294002) treatment, subcellular localization by immunofluorescence\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay + MS phosphosite ID + mutagenesis + localization, multiple orthogonal methods\",\n      \"pmids\": [\"15998322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"JFC1/SYTL1 (a Rab27a- and PIP3-binding protein) regulates androgen-dependent secretion of prostatic-specific acid phosphatase (PSAP) but not PSA from LNCaP prostate cells; JFC1 co-localizes with PSAP but not PSA in prostate granules, and both Rab27a and PI3K are required for exocytosis of prostate-specific secretory markers.\",\n      \"method\": \"Dominant-negative C2A domain overexpression, JFC1 overexpression, immunofluorescence colocalization, PI3K inhibitor treatment, constitutively active Rab27aQ78L expression, secretion assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function, gain-of-function, and colocalization with defined secretory phenotype\",\n      \"pmids\": [\"16004602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"JFC1/SYTL1 and Munc13-4 are Rab27a effectors that regulate exocytosis of distinct neutrophil granule subsets; JFC1 co-localizes with Rab27a in predocked/docked vesicles and specifically regulates azurophilic granule (myeloperoxidase) exocytosis, while Munc13-4 regulates gelatinase B (gelatinase granule) secretion.\",\n      \"method\": \"siRNA knockdown, TIRF microscopy, immunofluorescence, genetically modified mice (Munc13-4-deficient Jinx mice), secretion assay for myeloperoxidase and gelatinase B\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA KD and KO mouse model with specific secretory phenotype readout, replicated for multiple granule types\",\n      \"pmids\": [\"18939952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Slp1/JFC1 and Slp2-a are expressed in cytotoxic T lymphocytes (CTLs), both interact with Rab27a, and both localize predominantly to the plasma membrane of human and mouse CTLs. Slp2-a but not Slp1 is rapidly degraded when Rab27a is absent (due to PEST-like sequences in Slp2-a). Dominant-negative SHD of Slp2-a (56% identical to Slp1 SHD) reduces CTL killing, indicating both contribute to secretory lysosome exocytosis from CTL.\",\n      \"method\": \"Expression screening, co-immunoprecipitation with Rab27a, immunofluorescence localization in CTLs, dominant-negative overexpression, cytotoxicity assay\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP, localization, and dominant-negative functional assay, single lab\",\n      \"pmids\": [\"18266782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Slp1/JFC1 is abundantly expressed in pancreatic acinar cells, interacts with Rab27B in vivo, co-localizes with Rab27B on zymogen granules, and Slp1 knockout mice show increased numbers of zymogen granules, indicating Slp1 is part of the amylase secretion machinery of the exocrine pancreas.\",\n      \"method\": \"Immunohistochemistry/immunofluorescence, co-immunoprecipitation, Slp1 knockout mouse analysis, morphological analysis\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and KO mouse with defined secretory phenotype, single lab\",\n      \"pmids\": [\"18477466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JFC1/SYTL1 associates with the RhoA-GAP protein GMIP (Gem-interacting protein); GMIP downregulation induces RhoA activation and actin polymerization that impairs vesicular transport and exocytosis. JFC1-containing secretory organelles move in actin-free areas near the plasma membrane, and JFC1-knockout neutrophils show increased RhoA activity with azurophilic granules unable to traverse cortical actin.\",\n      \"method\": \"Proteomic/mass spectrometry identification, live-cell quantitative microscopy, JFC1 knockout neutrophils, RhoA activity assay, siRNA knockdown of GMIP, actin visualization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification confirmed by KO cells, live imaging, and RhoA activity assay with defined trafficking phenotype\",\n      \"pmids\": [\"22438581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EPI64 (a TBC-domain RabGAP protein) directly binds to a C-terminal region of JFC1/SYTL1; JFC1 is an effector for Rab8a, and EPI64 recruits Rab8a-GTP via JFC1 for deactivation by EPI64's RabGAP activity, thereby regulating Arf6-dependent membrane trafficking. Mutations that uncouple JFC1 from either EPI64 or Rab8-GTP disrupt vacuole formation phenotype.\",\n      \"method\": \"Co-localization, direct binding assay, mutant analysis (RabGAP-dead EPI64, JFC1 uncoupling mutants), co-expression studies, Rab8-GTP level measurement\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding, multiple mutant analyses, and functional epistasis with defined phenotypic readout\",\n      \"pmids\": [\"22219378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"JFC1/SYTL1 controls Rac1-GTP recycling from the neutrophil uropod to promote directional migration; JFC1-null neutrophils show Rac1-GTP accumulation at the uropod and impaired chemotaxis in vitro and in vivo. JFC1 interacts with Rac1-GTP in a Rab27a-independent manner at dynamic vesicles, and STORM super-resolution microscopy shows adjacent distribution of JFC1 and Rac1-GTP that increases upon activation.\",\n      \"method\": \"JFC1-null mice, live-cell microscopy, STORM super-resolution microscopy, co-immunoprecipitation (Rac1-GTP and JFC1), in vivo bone marrow chimera neutrophil migration assay, chemotaxis assay, Rac1-GTP localization analysis\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mice with in vivo migration assay, co-IP, super-resolution microscopy, multiple orthogonal methods\",\n      \"pmids\": [\"30748033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LincRNA01703 enhances the interaction between Rab27a, SYTL1/JFC1, and CD81 to promote secretion of CD81+ exosomes; this complex formation suppresses immune cell infiltration in the tumor microenvironment to inhibit lung adenocarcinoma metastasis.\",\n      \"method\": \"In vivo metastasis assay, co-immunoprecipitation, exosome secretion assay, lncRNA overexpression/knockdown\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP showing complex formation, functional in vivo assay, single lab\",\n      \"pmids\": [\"38136327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WTAP (m6A writer) promotes YTHDF2-mediated m6A methylation and degradation of SYTL1 mRNA, reducing SYTL1 protein levels in bladder cancer cells and impairing NK cell anti-tumor activity.\",\n      \"method\": \"RIP-qPCR, actinomycin D mRNA stability assay, western blot, RT-qPCR, in vivo tumor model\",\n      \"journal\": \"Histology and histopathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — RIP-qPCR demonstrating m6A reader binding to SYTL1 mRNA, mRNA stability assay, multiple methods\",\n      \"pmids\": [\"37933909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ELK1 recruits HDAC2 to the SYTL1 promoter to repress SYTL1 transcription; ELK1 and HDAC2 form a complex that specifically binds the SYTL1 promoter, suppressing SYTL1 expression and promoting bladder cancer malignant phenotype.\",\n      \"method\": \"ChIP assay, co-immunoprecipitation, luciferase reporter assay, siRNA knockdown of ELK1/HDAC2, in vitro and in vivo tumor assays\",\n      \"journal\": \"Human cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ChIP demonstrating direct promoter binding, co-IP for complex, and functional rescue experiment\",\n      \"pmids\": [\"36107384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Rab27a effector JFC1/SYTL1 localizes to Anaplasma phagocytophilum inclusions via its C2A domain binding 3'-phosphoinositides (PI3P enriched in inclusion membrane), mediating docking/fusion of Rab27a-bearing granules with inclusions to promote bacterial proliferation; blocking Rab27a-JFC1 interaction with Nexinhib20 inhibits Anaplasma infection.\",\n      \"method\": \"shRNA knockdown, live-cell imaging, immunostaining, dominant-negative C2A domain expression, small-molecule inhibitor (Nexinhib20), infection assay\",\n      \"journal\": \"Microbes and infection\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD, dominant-negative, pharmacological inhibition with defined infectious phenotype, single lab\",\n      \"pmids\": [\"38110148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Nexinhib20 inhibits JFC1-mediated mobilization of a subset of CD11b+ granules to the plasma membrane, reducing β2-integrin avidity; this effect is JFC1-dependent but Rac1-independent, confirmed by JFC1-KO neutrophils and direct measurement of Rac1 activation by FRET-based assay and Rac1-PAK1 binding assay.\",\n      \"method\": \"JFC1-KO mice, Nexinhib20 small-molecule inhibitor, quantitative 3D super-resolution microscopy, FRET-based Rac1 activity assay, Rac1-PAK1 binding assay, flow cytometry\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse + small-molecule inhibitor + multiple orthogonal Rac1 activity assays + super-resolution microscopy\",\n      \"pmids\": [\"39883854\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"JFC1/SYTL1 is a Rab27a effector protein with tandem C2 domains that functions as a vesicular trafficking regulator: its C2A domain binds 3'-phosphoinositides (PIP3) to direct plasma membrane localization, its SHD domain binds active Rab27a to mediate docking/priming of secretory granules (particularly azurophilic granules in neutrophils), it associates with the RhoA-GAP GMIP to facilitate cortical actin traversal during exocytosis, and it regulates directional neutrophil migration by controlling Rac1-GTP recycling from the uropod; additionally, JFC1 has intrinsic magnesium-dependent ATPase activity, is phosphorylated by Akt at S241 causing membrane dissociation, and its transcription is activated by NF-κB and repressed by an ELK1/HDAC2 complex.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SYTL1 (JFC1/Slp1) is a tandem C2 domain-containing Rab27a/Rab27B effector that orchestrates vesicular trafficking, regulated exocytosis, and cell migration in hematopoietic and secretory cell types. Its C2A domain binds 3'-phosphoinositides (PI(3,4,5)P3 and PI(3,4)P2) to direct plasma membrane and secretory vesicle localization, while its SHD domain engages GTP-bound Rab27a to dock secretory granules—particularly azurophilic granules in neutrophils and zymogen granules in pancreatic acinar cells—for exocytic fusion [PMID:12189202, PMID:18939952, PMID:18477466]. SYTL1 recruits the RhoA-GAP GMIP to locally inactivate RhoA and create actin-free corridors that permit granule transit through cortical actin, and independently controls directional neutrophil migration by recycling Rac1-GTP from the uropod via a Rab27a-independent interaction [PMID:22438581, PMID:30748033]. SYTL1 also possesses intrinsic Mg²⁺-dependent ATPase activity, is phosphorylated by Akt at S241 causing membrane dissociation, serves as a scaffold linking Rab8a to the RabGAP EPI64 in Arf6-dependent trafficking, and its transcription is positively regulated by NF-κB and repressed by an ELK1–HDAC2 complex [PMID:11553774, PMID:15998322, PMID:22219378, PMID:12137562, PMID:36107384].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of JFC1/SYTL1 as a novel tandem C2 domain protein that binds 3'-phosphoinositides and associates with the NADPH oxidase component p67phox established it as a PI3K-regulated adaptor in neutrophils.\",\n      \"evidence\": \"Yeast two-hybrid screen, recombinant pulldown, lipid-binding assay, and subcellular fractionation in neutrophils\",\n      \"pmids\": [\"11278853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological significance of p67phox interaction for oxidase assembly not tested in intact cells\", \"Whether JFC1 directly activates the oxidase or merely scaffolds remains unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that JFC1 possesses intrinsic Mg²⁺-dependent ATPase activity with defined kinetics revealed an unexpected enzymatic function for a trafficking adaptor, distinct from known ATPase superfamilies.\",\n      \"evidence\": \"In vitro ATPase assay with recombinant protein, photoaffinity labeling with 8-azido-ATP, truncation mutagenesis\",\n      \"pmids\": [\"11553774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biological role of ATPase activity in vesicular trafficking not determined\", \"No structural model of the nucleotide-binding site\", \"No in vivo mutagenesis of ATPase site to test functional significance\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping the C2A domain as the sole PIP3-binding and plasma membrane-targeting module, and identifying NF-κB-dependent transcriptional activation, defined both the membrane-targeting mechanism and an inflammatory signaling input for SYTL1 expression.\",\n      \"evidence\": \"Live-cell imaging of GFP-tagged domains with PI3K inhibitor, colocalization with Akt-PH domain; EMSA/supershift, luciferase reporter, and promoter mutagenesis in prostate carcinoma cells\",\n      \"pmids\": [\"12189202\", \"12137562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of calcium to C2A membrane association in physiological settings not fully resolved\", \"Whether NF-κB-driven upregulation is relevant in primary neutrophils versus carcinoma cells\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing that Akt phosphorylates JFC1 at S241 to drive membrane dissociation, while Rab27a binding antagonizes this phosphorylation, revealed a regulatory switch coordinating PI3K signaling with Rab27a-dependent vesicle docking.\",\n      \"evidence\": \"In vitro kinase assay, mass spectrometry phosphosite mapping, S241A and W83S mutagenesis, immunofluorescence localization, PI3K inhibitor treatment\",\n      \"pmids\": [\"15998322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Temporal dynamics of Akt phosphorylation during stimulus-coupled exocytosis not resolved\", \"No phospho-specific antibody validated in primary cells\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that JFC1 selectively regulates androgen-dependent secretion of prostatic-specific acid phosphatase but not PSA in prostate cells established cargo-selective exocytic function downstream of Rab27a and PI3K.\",\n      \"evidence\": \"Dominant-negative C2A overexpression, JFC1 overexpression, immunofluorescence colocalization, secretion assay in LNCaP cells\",\n      \"pmids\": [\"16004602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cargo selectivity between PSAP and PSA granules not identified\", \"Relevance to prostate physiology in vivo not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining JFC1 as a Rab27a effector that specifically controls azurophilic granule exocytosis in neutrophils (distinct from Munc13-4's control of gelatinase granules) and demonstrating its expression and Rab27a/Rab27B interaction in CTLs and pancreatic acinar cells broadened SYTL1's role to a general secretory granule regulator across cell types.\",\n      \"evidence\": \"siRNA knockdown and TIRF microscopy in neutrophils; Munc13-4-KO Jinx mice; co-IP and Slp1-KO mouse analysis of pancreatic zymogen granules; co-IP and localization in CTLs\",\n      \"pmids\": [\"18939952\", \"18477466\", \"18266782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of granule subtype specificity (azurophilic vs. gelatinase) not molecularly defined\", \"Slp1-KO pancreatic secretion was not functionally measured (only granule accumulation shown)\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying GMIP as a JFC1-associated RhoA-GAP that creates actin-free corridors for granule transit, and separately showing JFC1 scaffolds Rab8a for deactivation by EPI64, established JFC1 as a multi-Rab effector that coordinates actin remodeling with membrane trafficking.\",\n      \"evidence\": \"Proteomic identification of GMIP, JFC1-KO neutrophils with RhoA activity assay and live imaging; direct binding assay of JFC1–EPI64, Rab8a-GTP measurement, mutant epistasis\",\n      \"pmids\": [\"22438581\", \"22219378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GMIP and EPI64 pathways operate in the same cell type simultaneously is unknown\", \"Structural basis of JFC1 engagement with multiple Rab partners not determined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealing that JFC1 controls Rac1-GTP recycling from the neutrophil uropod to enable directional chemotaxis—independently of Rab27a—uncovered a migration-specific function distinct from its exocytic role.\",\n      \"evidence\": \"JFC1-null mice with in vivo bone marrow chimera migration assay, co-IP of JFC1 with Rac1-GTP, STORM super-resolution microscopy\",\n      \"pmids\": [\"30748033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which JFC1 extracts or recycles Rac1-GTP from uropod membranes is unknown\", \"Whether other Slp-family members compensate in JFC1-null cells for migration\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of ELK1–HDAC2-mediated transcriptional repression of SYTL1, and WTAP/YTHDF2-mediated m6A-dependent mRNA degradation, defined two layers of negative regulation of SYTL1 expression relevant to bladder cancer.\",\n      \"evidence\": \"ChIP, co-IP, luciferase reporter for ELK1–HDAC2; RIP-qPCR and mRNA stability assay for m6A regulation\",\n      \"pmids\": [\"36107384\", \"37933909\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct functional consequence of restoring SYTL1 in bladder cancer on vesicular trafficking not tested\", \"Whether these regulatory mechanisms operate in immune cells is unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that SYTL1 localizes to Anaplasma phagocytophilum inclusions via C2A-PI3P binding to deliver Rab27a+ granules for bacterial benefit, and that lincRNA01703 enhances Rab27a–SYTL1–CD81 complex formation for exosome secretion, expanded SYTL1's roles to pathogen exploitation and tumor-derived exosome biogenesis.\",\n      \"evidence\": \"shRNA knockdown, dominant-negative C2A, Nexinhib20 inhibitor in A. phagocytophilum infection model; co-IP and exosome secretion assay for lincRNA01703–Rab27a–JFC1–CD81 in lung adenocarcinoma\",\n      \"pmids\": [\"38110148\", \"38136327\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether pathogen-directed JFC1 utilization occurs in vivo during anaplasmosis is untested\", \"Mechanism by which lincRNA01703 enhances ternary complex formation is unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showing that Nexinhib20 inhibits JFC1-dependent mobilization of CD11b+ granules and β2-integrin avidity in a JFC1-dependent but Rac1-independent manner clarified that JFC1's integrin-mobilization and migration functions are mechanistically separable.\",\n      \"evidence\": \"JFC1-KO mice, Nexinhib20 treatment, quantitative 3D super-resolution microscopy, FRET-based Rac1 activity assay, flow cytometry\",\n      \"pmids\": [\"39883854\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise molecular target of Nexinhib20 on JFC1 not structurally defined\", \"In vivo therapeutic efficacy of Nexinhib20 in inflammatory disease models not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biological function of JFC1's intrinsic ATPase activity, the structural basis for its engagement with multiple Rab GTPases and Rac1, and whether its trafficking and migration functions are coordinated or independently regulated in vivo remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of full-length SYTL1 or its complexes\", \"ATPase activity has no assigned in vivo function\", \"Relative contributions of SYTL1 to exocytosis versus migration in immune defense in vivo not dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 10, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 4, 7]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 6, 11, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 6, 8, 9, 10, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 11, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 9, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAB27A\", \"GMIP\", \"TBC1D10A\", \"RAB8A\", \"RAC1\", \"NFKB1\", \"CD81\"],\n    \"other_free_text\": []\n  }\n}\n```"}