{"gene":"SYT10","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":2011,"finding":"Syt10 functions as the Ca2+-sensor that triggers activity-dependent IGF-1 exocytosis in olfactory bulb neurons. Syt10 colocalizes with IGF-1 in somatodendritic vesicles, and Ca2+-binding to Syt10 causes these vesicles to undergo exocytosis, secreting IGF-1. Deletion of Syt10 impaired activity-dependent IGF-1 secretion, resulting in smaller neurons and decreased synapse numbers, phenotypes fully rescued by exogenous IGF-1. This pathway is spatially and temporally distinct from Syt1-controlled synaptic vesicle exocytosis.","method":"Syt10 knockout mice, live-cell imaging/colocalization, exogenous IGF-1 rescue, Ca2+-dependent exocytosis assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, genetic rescue, colocalization; highly cited foundational study","pmids":["21496647"],"is_preprint":false},{"year":1999,"finding":"Synaptotagmin-10 (SytX) forms beta-mercaptoethanol-sensitive heterodimers with Syt III, V, and VI via a conserved N-terminal cysteine motif. The first of three conserved N-terminal cysteine residues (at positions 10, 21, and 33 of mouse Syt III) is essential for stable homodimer and heterodimer formation among this subclass of synaptotagmins.","method":"Site-directed mutagenesis of cysteine residues, co-immunoprecipitation, reducing agent sensitivity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — mutagenesis combined with co-IP; highly cited study with clear biochemical mechanism","pmids":["10531343"],"is_preprint":false},{"year":2003,"finding":"Human SYT10 encodes a 523-amino acid protein sharing 94.6–94.8% homology to rat and mouse Syt10 at the protein level, containing one transmembrane region and two conserved C2 domains. RT-PCR revealed expression restricted to pancreas, lung, and kidney.","method":"cDNA library screening, RT-PCR, sequence analysis","journal":"DNA sequence : the journal of DNA sequencing and mapping","confidence":"Medium","confidence_rationale":"Tier 3 — cloning and characterization; single lab, single method but establishes basic protein structure","pmids":["14756426"],"is_preprint":false},{"year":2016,"finding":"Syt10 is identified as a downstream effector of the transcription factor NPAS4 in neuroprotection against excitotoxicity. Syt10 expression is strongly upregulated by pathophysiologic synaptic activity (kainic acid exposure), and its absence renders hippocampal neurons highly susceptible to excitotoxic insults. NPAS4 is required for the activity-induced increase in Syt10 levels, and NPAS4's ability to confer neuroprotection is severely diminished in Syt10 knockout neurons.","method":"Syt10 knockout mice, kainic acid excitotoxicity model, genetic epistasis (NPAS4-Syt10 pathway), neuronal survival assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined phenotype, genetic epistasis establishing pathway position, multiple controls","pmids":["26936998"],"is_preprint":false},{"year":2017,"finding":"SYT10 was identified in an RNAi screen of ~139 C2 domain-containing proteins as a positive regulator of Ca2+-dependent dense-core vesicle (DCV) exocytosis in neuroendocrine cells, confirming its role in regulated secretion beyond neurons.","method":"Genome-wide RNAi screen in BON neuroendocrine cells measuring DCV exocytosis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 3 — identified in a functional screen with defined cellular readout; single method","pmids":["28626000"],"is_preprint":false},{"year":2011,"finding":"Syt10 is strongly expressed in the suprachiasmatic nucleus (SCN), and a Syt10-Cre driver mouse was generated by inserting Cre recombinase into the Syt10 locus. Syt10-Cre mice show high-efficiency Cre recombination specifically in SCN neurons (and testis), with homozygous Syt10-Cre mice showing slightly reduced light-induced phase delays, indicating a minor role in photic entrainment.","method":"Knock-in Cre driver generation, beta-galactosidase reporter crosses, circadian locomotor activity assays","journal":"Journal of biological rhythms","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization/expression experiment with functional consequence; single lab","pmids":["21921292"],"is_preprint":false},{"year":2023,"finding":"A genome-wide gene-gene interaction study in 18,688 Parkinson's disease patients identified a significant interaction between a non-coding LRRK2 variant (rs76904798) and a SYT10 promoter region SNP (rs1007709), with an interaction OR of 1.80. SYT10 SNPs were also associated with age-at-onset of PD in LRRK2 p.G2019S mutation carriers, and SYT10 gene expression during neuronal development differed between affected and non-affected p.G2019S carriers, suggesting functional interplay between LRRK2 and SYT10 in neuronal exocytosis pathways.","method":"Case-only genome-wide gene-gene interaction analysis, independent cohort validation, gene expression analysis in patient-derived cells","journal":"NPJ Parkinson's disease","confidence":"Low","confidence_rationale":"Tier 4 — genetic association with mechanistic hypothesis; no direct biochemical or functional mechanistic data","pmids":["37386035"],"is_preprint":false}],"current_model":"SYT10 (Synaptotagmin-10) is a vesicular Ca2+-sensor that forms homodimers and heterodimers with other synaptotagmins (III, V, VI) via conserved N-terminal cysteine residues; in olfactory bulb neurons it localizes to somatodendritic IGF-1-containing vesicles and triggers their Ca2+-dependent exocytosis in response to activity, a pathway spatially and functionally distinct from Syt1-mediated synaptic vesicle release, and in hippocampal neurons SYT10 acts as a downstream effector of the transcription factor NPAS4 to protect against excitotoxic neurodegeneration."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing how SYT10 oligomerizes revealed that a conserved N-terminal cysteine motif mediates disulfide-dependent homo- and heterodimerization with synaptotagmins III, V, and VI, defining SYT10 as a member of a biochemically distinct synaptotagmin subclass.","evidence":"Site-directed mutagenesis of cysteine residues with co-immunoprecipitation under reducing and non-reducing conditions","pmids":["10531343"],"confidence":"High","gaps":["Functional significance of heterodimer versus homodimer formation is unknown","Whether dimerization is required for Ca²⁺-dependent exocytosis has not been tested","No structural data on the dimer interface"]},{"year":2003,"claim":"Cloning of human SYT10 established its primary structure — a 523-amino acid protein with a transmembrane domain and two C2 domains — and revealed restricted peripheral expression in pancreas, lung, and kidney, complementing its known neural expression.","evidence":"cDNA library screening and RT-PCR tissue survey","pmids":["14756426"],"confidence":"Medium","gaps":["No protein-level validation of tissue expression","Ca²⁺-binding properties of the C2 domains were not characterized"]},{"year":2011,"claim":"The central mechanistic question — what cargo SYT10 senses Ca²⁺ for — was answered: SYT10 localizes to IGF-1-containing somatodendritic vesicles in olfactory neurons and is the Ca²⁺-sensor triggering their exocytosis, with Syt10 knockout abolishing activity-dependent IGF-1 secretion, reducing neuronal size and synapse number, phenotypes rescued by exogenous IGF-1.","evidence":"Syt10 knockout mice, live-cell colocalization imaging, Ca²⁺-dependent exocytosis assays, IGF-1 rescue experiments","pmids":["21496647"],"confidence":"High","gaps":["Molecular mechanism of Ca²⁺ sensing (which C2 domain, Ca²⁺ affinity) is unresolved","Whether SYT10 directly binds the vesicle SNARE machinery has not been shown","Role in non-olfactory neuronal populations not addressed"]},{"year":2011,"claim":"Prominent SYT10 expression in the suprachiasmatic nucleus and a subtle circadian phenotype in Syt10-Cre homozygous mice implicated SYT10 in photic entrainment, broadening its physiological scope beyond olfactory neurons.","evidence":"Syt10-Cre knock-in mice, reporter crosses, circadian locomotor activity and phase-delay assays","pmids":["21921292"],"confidence":"Medium","gaps":["The cargo vesicle and secreted factor in SCN neurons are unidentified","Phenotype is subtle and based on insertional disruption of one allele in Cre homozygotes"]},{"year":2016,"claim":"SYT10 was placed downstream of the transcription factor NPAS4 in an activity-dependent neuroprotective pathway: NPAS4 drives Syt10 upregulation upon excitotoxic stimulation, and Syt10 is required for NPAS4-mediated neuronal survival, establishing a transcriptional–secretory axis against neurodegeneration.","evidence":"Syt10 knockout mice, kainic acid excitotoxicity model, genetic epistasis between NPAS4 and Syt10, neuronal survival assays","pmids":["26936998"],"confidence":"High","gaps":["Identity of the neuroprotective cargo released downstream of SYT10 in hippocampal neurons is unknown","Whether IGF-1 is the effector in this context, as in olfactory neurons, has not been tested"]},{"year":2017,"claim":"An unbiased RNAi screen extended SYT10's role to neuroendocrine dense-core vesicle exocytosis beyond the nervous system, confirming it as a general positive regulator of Ca²⁺-dependent regulated secretion.","evidence":"RNAi screen of ~139 C2-domain proteins in BON neuroendocrine cells measuring DCV exocytosis","pmids":["28626000"],"confidence":"Medium","gaps":["Hit identified in a screen; individual rescue or overexpression validation not reported","Specific DCV cargo regulated by SYT10 in neuroendocrine cells is unknown"]},{"year":null,"claim":"Key unresolved questions include the Ca²⁺-binding properties and SNARE-interaction mechanism of SYT10's C2 domains, the identity of its cargo in hippocampal and SCN neurons, and whether its dimerization with other synaptotagmins modulates vesicle fusion specificity.","evidence":"","pmids":[],"confidence":"High","gaps":["No reconstituted fusion assay with purified SYT10","No structural model of SYT10 C2 domains bound to Ca²⁺ or membranes","Functional role of heterodimerization in vivo is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,2]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,4]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,3,5]}],"complexes":[],"partners":["SYT3","SYT5","SYT6","NPAS4"],"other_free_text":[]},"mechanistic_narrative":"SYT10 is a Ca²⁺-sensing synaptotagmin that drives activity-dependent exocytosis of dense-core vesicles, particularly IGF-1-containing somatodendritic vesicles in olfactory bulb neurons, through a pathway spatially and functionally distinct from Syt1-mediated synaptic vesicle release [PMID:21496647, PMID:28626000]. It forms disulfide-linked homodimers and heterodimers with synaptotagmins III, V, and VI via a conserved N-terminal cysteine motif, with the first cysteine being essential for stable dimer formation [PMID:10531343]. In hippocampal neurons, SYT10 expression is upregulated by pathological activity through the transcription factor NPAS4, and SYT10 is required for NPAS4-dependent neuroprotection against excitotoxicity [PMID:26936998]. SYT10 is also prominently expressed in the suprachiasmatic nucleus, where it contributes to photic entrainment of circadian rhythms [PMID:21921292]."},"prefetch_data":{"uniprot":{"accession":"Q6XYQ8","full_name":"Synaptotagmin-10","aliases":["Synaptotagmin X","SytX"],"length_aa":523,"mass_kda":59.1,"function":"Ca(2+) sensor specifically required for the Ca(2+)-dependent exocytosis of secretory vesicles containing IGF1 in neurons of the olfactory bulb. Exocytosis of IGF1 is required for sensory perception of smell. Not involved in Ca(2+)-dependent synaptic vesicle exocytosis (By similarity). Acts through Ca(2+) and phospholipid binding to the C2 domain: Ca(2+) induces binding of the C2-domains to phospholipid membranes and to assembled SNARE-complexes; both actions contribute to triggering exocytosis (By similarity)","subcellular_location":"Cytoplasmic vesicle, secretory vesicle membrane","url":"https://www.uniprot.org/uniprotkb/Q6XYQ8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SYT10","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SYT10","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"fallopian tube","ntpm":2.1}],"url":"https://www.proteinatlas.org/search/SYT10"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q6XYQ8","domains":[{"cath_id":"2.60.40.150","chopping":"232-357","consensus_level":"high","plddt":91.9144,"start":232,"end":357},{"cath_id":"2.60.40.150","chopping":"367-498","consensus_level":"high","plddt":94.0688,"start":367,"end":498}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6XYQ8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6XYQ8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6XYQ8-F1-predicted_aligned_error_v6.png","plddt_mean":73.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SYT10","jax_strain_url":"https://www.jax.org/strain/search?query=SYT10"},"sequence":{"accession":"Q6XYQ8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6XYQ8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6XYQ8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6XYQ8"}},"corpus_meta":[{"pmid":"21496647","id":"PMC_21496647","title":"Activity-dependent 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Syt10 colocalizes with IGF-1 in somatodendritic vesicles, and Ca2+-binding to Syt10 causes these vesicles to undergo exocytosis, secreting IGF-1. Deletion of Syt10 impaired activity-dependent IGF-1 secretion, resulting in smaller neurons and decreased synapse numbers, phenotypes fully reversed by exogenous IGF-1.\",\n      \"method\": \"Syt10 knockout mouse, live-cell imaging, colocalization of Syt10 with IGF-1 vesicles, activity-dependent secretion assay, IGF-1 rescue experiment\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, colocalization, and epistatic rescue by exogenous IGF-1; highly cited foundational study\",\n      \"pmids\": [\"21496647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Syt10 is a downstream effector of the transcription factor NPAS4 that mediates neuroprotection against excitotoxic insults. Pathophysiologic synaptic activity strongly upregulates Syt10 expression via NPAS4, and Syt10 knockout neurons are highly susceptible to kainic acid-induced excitotoxicity. NPAS4's ability to confer neuroprotection is severely diminished in Syt10 knockout neurons, placing Syt10 downstream of NPAS4 in an activity-regulated neuroprotective pathway.\",\n      \"method\": \"Syt10 knockout mouse, kainic acid excitotoxicity model, epistasis analysis (NPAS4 overexpression in Syt10 KO neurons), neuronal survival assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined cellular phenotype (neuronal death), single lab\",\n      \"pmids\": [\"26936998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SYT10 was identified in an RNAi screen of all ~139 human C2 domain-containing proteins as a regulator of Ca2+-dependent dense-core vesicle (DCV) exocytosis in neuroendocrine cells, confirming its role in the exocytosis pathway in this cell type.\",\n      \"method\": \"Genome-wide RNAi screen of C2 domain-containing proteins in BON neuroendocrine cells measuring DCV exocytosis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — identified in a functional screen; confirms role in DCV exocytosis but limited mechanistic follow-up on SYT10 itself\",\n      \"pmids\": [\"28626000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A genome-wide case-only gene-gene interaction study revealed a significant statistical interaction between LRRK2 (rs76904798) and a SNP in the SYT10 promoter region (rs1007709) modifying Parkinson's disease risk. SYT10 gene expression during neuronal development differed between cells from affected and non-affected LRRK2 p.G2019S carriers, and SYT10-region SNPs were associated with age-at-onset of PD in LRRK2 mutation carriers, suggesting SYT10 functions in the same pathway as LRRK2 in neuronal exocytosis relevant to PD.\",\n      \"method\": \"Case-only genome-wide SNP interaction analysis (18,688 PD patients), independent cohort genotype-phenotype analysis, SYT10 expression analysis in iPSC-derived neurons from LRRK2 carriers\",\n      \"journal\": \"NPJ Parkinson's disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3/4 — genetic association with expression data; no direct biochemical interaction demonstrated between LRRK2 and SYT10\",\n      \"pmids\": [\"37386035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Proteomic analysis of Pb-exposed mouse hippocampus identified downregulation of SYT10 protein, and bioinformatic analysis implicated the SYT10/IGF-1 signaling pathway as a key mechanistic route linking postnatal lead exposure to autism-like behaviors including reduced social interaction and increased repetitive behavior.\",\n      \"method\": \"TMT-based quantitative proteomics of mouse hippocampus after postnatal Pb exposure; behavioral phenotyping (three-chamber social test, marble-burying test)\",\n      \"journal\": \"Toxics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3/4 — proteomic identification without direct mechanistic validation of SYT10/IGF-1 pathway\",\n      \"pmids\": [\"40559938\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SYT10 (Synaptotagmin-10) is a Ca2+-sensor protein that localizes to IGF-1-containing somatodendritic vesicles in neurons, where Ca2+-binding triggers exocytosis of IGF-1; this pathway is spatially and temporally distinct from synaptic vesicle exocytosis controlled by Syt1, and SYT10 expression is transcriptionally upregulated by NPAS4 in response to pathophysiologic activity to mediate neuroprotection against excitotoxic insults.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"Syt10 functions as the Ca2+-sensor that triggers activity-dependent IGF-1 exocytosis in olfactory bulb neurons. Syt10 colocalizes with IGF-1 in somatodendritic vesicles, and Ca2+-binding to Syt10 causes these vesicles to undergo exocytosis, secreting IGF-1. Deletion of Syt10 impaired activity-dependent IGF-1 secretion, resulting in smaller neurons and decreased synapse numbers, phenotypes fully rescued by exogenous IGF-1. This pathway is spatially and temporally distinct from Syt1-controlled synaptic vesicle exocytosis.\",\n      \"method\": \"Syt10 knockout mice, live-cell imaging/colocalization, exogenous IGF-1 rescue, Ca2+-dependent exocytosis assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, genetic rescue, colocalization; highly cited foundational study\",\n      \"pmids\": [\"21496647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Synaptotagmin-10 (SytX) forms beta-mercaptoethanol-sensitive heterodimers with Syt III, V, and VI via a conserved N-terminal cysteine motif. The first of three conserved N-terminal cysteine residues (at positions 10, 21, and 33 of mouse Syt III) is essential for stable homodimer and heterodimer formation among this subclass of synaptotagmins.\",\n      \"method\": \"Site-directed mutagenesis of cysteine residues, co-immunoprecipitation, reducing agent sensitivity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — mutagenesis combined with co-IP; highly cited study with clear biochemical mechanism\",\n      \"pmids\": [\"10531343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human SYT10 encodes a 523-amino acid protein sharing 94.6–94.8% homology to rat and mouse Syt10 at the protein level, containing one transmembrane region and two conserved C2 domains. RT-PCR revealed expression restricted to pancreas, lung, and kidney.\",\n      \"method\": \"cDNA library screening, RT-PCR, sequence analysis\",\n      \"journal\": \"DNA sequence : the journal of DNA sequencing and mapping\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cloning and characterization; single lab, single method but establishes basic protein structure\",\n      \"pmids\": [\"14756426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Syt10 is identified as a downstream effector of the transcription factor NPAS4 in neuroprotection against excitotoxicity. Syt10 expression is strongly upregulated by pathophysiologic synaptic activity (kainic acid exposure), and its absence renders hippocampal neurons highly susceptible to excitotoxic insults. NPAS4 is required for the activity-induced increase in Syt10 levels, and NPAS4's ability to confer neuroprotection is severely diminished in Syt10 knockout neurons.\",\n      \"method\": \"Syt10 knockout mice, kainic acid excitotoxicity model, genetic epistasis (NPAS4-Syt10 pathway), neuronal survival assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined phenotype, genetic epistasis establishing pathway position, multiple controls\",\n      \"pmids\": [\"26936998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SYT10 was identified in an RNAi screen of ~139 C2 domain-containing proteins as a positive regulator of Ca2+-dependent dense-core vesicle (DCV) exocytosis in neuroendocrine cells, confirming its role in regulated secretion beyond neurons.\",\n      \"method\": \"Genome-wide RNAi screen in BON neuroendocrine cells measuring DCV exocytosis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — identified in a functional screen with defined cellular readout; single method\",\n      \"pmids\": [\"28626000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Syt10 is strongly expressed in the suprachiasmatic nucleus (SCN), and a Syt10-Cre driver mouse was generated by inserting Cre recombinase into the Syt10 locus. Syt10-Cre mice show high-efficiency Cre recombination specifically in SCN neurons (and testis), with homozygous Syt10-Cre mice showing slightly reduced light-induced phase delays, indicating a minor role in photic entrainment.\",\n      \"method\": \"Knock-in Cre driver generation, beta-galactosidase reporter crosses, circadian locomotor activity assays\",\n      \"journal\": \"Journal of biological rhythms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization/expression experiment with functional consequence; single lab\",\n      \"pmids\": [\"21921292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A genome-wide gene-gene interaction study in 18,688 Parkinson's disease patients identified a significant interaction between a non-coding LRRK2 variant (rs76904798) and a SYT10 promoter region SNP (rs1007709), with an interaction OR of 1.80. SYT10 SNPs were also associated with age-at-onset of PD in LRRK2 p.G2019S mutation carriers, and SYT10 gene expression during neuronal development differed between affected and non-affected p.G2019S carriers, suggesting functional interplay between LRRK2 and SYT10 in neuronal exocytosis pathways.\",\n      \"method\": \"Case-only genome-wide gene-gene interaction analysis, independent cohort validation, gene expression analysis in patient-derived cells\",\n      \"journal\": \"NPJ Parkinson's disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — genetic association with mechanistic hypothesis; no direct biochemical or functional mechanistic data\",\n      \"pmids\": [\"37386035\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SYT10 (Synaptotagmin-10) is a vesicular Ca2+-sensor that forms homodimers and heterodimers with other synaptotagmins (III, V, VI) via conserved N-terminal cysteine residues; in olfactory bulb neurons it localizes to somatodendritic IGF-1-containing vesicles and triggers their Ca2+-dependent exocytosis in response to activity, a pathway spatially and functionally distinct from Syt1-mediated synaptic vesicle release, and in hippocampal neurons SYT10 acts as a downstream effector of the transcription factor NPAS4 to protect against excitotoxic neurodegeneration.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SYT10 is a neuronal Ca²⁺-sensor that triggers activity-dependent exocytosis of IGF-1 from somatodendritic dense-core vesicles, functioning in a pathway distinct from synaptic vesicle release. SYT10 colocalizes with IGF-1 in somatodendritic vesicles of olfactory bulb neurons, and Ca²⁺ binding to its C2 domains drives IGF-1 secretion; genetic deletion of SYT10 impairs IGF-1 release, reduces neuronal size and synapse number, phenotypes rescued by exogenous IGF-1 [PMID:21496647]. SYT10 expression is transcriptionally upregulated by the activity-dependent transcription factor NPAS4 in response to pathophysiologic excitation, and SYT10 is required for NPAS4-mediated neuroprotection against excitotoxicity, as Syt10 knockout neurons are highly susceptible to kainic acid-induced death [PMID:26936998].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Establishing that SYT10 is not merely another synaptotagmin paralog but the specific Ca²⁺-sensor for a distinct exocytic pathway—activity-dependent IGF-1 secretion from somatodendritic vesicles—resolved the long-standing question of how neurons regulate non-synaptic peptide release independently of Syt1.\",\n      \"evidence\": \"Syt10 knockout mouse with live-cell imaging, colocalization with IGF-1 vesicles, activity-dependent secretion assays, and phenotypic rescue by exogenous IGF-1 in olfactory bulb neurons\",\n      \"pmids\": [\"21496647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether SYT10 directly binds membranes via its C2 domains or requires cofactors for vesicle fusion is not resolved\",\n        \"Whether SYT10 controls IGF-1 exocytosis in neuronal types beyond olfactory bulb neurons is untested\",\n        \"The SNARE partners engaged by SYT10-positive vesicles are unidentified\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placing SYT10 downstream of NPAS4 in an activity-regulated neuroprotective circuit answered how neurons translate pathophysiologic excitation into a survival signal, linking transcriptional induction of a vesicle Ca²⁺-sensor to protection against excitotoxicity.\",\n      \"evidence\": \"Epistasis analysis with NPAS4 overexpression in Syt10 knockout neurons subjected to kainic acid excitotoxicity; neuronal survival assays in mouse cortical cultures\",\n      \"pmids\": [\"26936998\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding; independent replication in other excitotoxicity models is lacking\",\n        \"Whether the neuroprotective effect operates entirely through IGF-1 secretion or involves additional SYT10-dependent cargo is unclear\",\n        \"Direct NPAS4 binding to the Syt10 promoter has not been demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"An unbiased RNAi screen of all human C2 domain proteins confirmed SYT10 as a functional regulator of dense-core vesicle exocytosis in neuroendocrine cells, generalizing its exocytic role beyond neurons.\",\n      \"evidence\": \"Genome-wide RNAi screen measuring Ca²⁺-dependent DCV exocytosis in BON neuroendocrine cells\",\n      \"pmids\": [\"28626000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The screen identified SYT10 as a hit but provided limited mechanistic follow-up specific to SYT10\",\n        \"Whether SYT10 acts on DCV exocytosis in neuroendocrine cells through the same IGF-1-dependent mechanism as in neurons is unknown\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A genetic interaction between LRRK2 and SYT10 promoter variants modifying Parkinson's disease risk and age-at-onset raised the possibility that SYT10-mediated exocytosis intersects with LRRK2-dependent pathways in neurodegeneration.\",\n      \"evidence\": \"Case-only genome-wide SNP interaction analysis in 18,688 PD patients; SYT10 expression analysis in iPSC-derived neurons from LRRK2 mutation carriers\",\n      \"pmids\": [\"37386035\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct biochemical interaction between LRRK2 and SYT10 has been demonstrated\",\n        \"The statistical interaction has not been validated in an independent cohort with functional follow-up\",\n        \"Whether SYT10 expression changes causally affect PD risk or are correlative is unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of SYT10 Ca²⁺-sensing and membrane fusion, identification of SNARE partners and additional vesicle cargo, and whether the NPAS4–SYT10–IGF-1 neuroprotective axis operates broadly across brain regions and disease contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of SYT10 C2 domains exists\",\n        \"SNARE complex partners for SYT10-positive vesicles remain unidentified\",\n        \"In vivo validation of SYT10-dependent neuroprotection in disease models beyond acute excitotoxicity is absent\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"NPAS4\",\n      \"IGF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SYT10 is a Ca²⁺-sensing synaptotagmin that drives activity-dependent exocytosis of dense-core vesicles, particularly IGF-1-containing somatodendritic vesicles in olfactory bulb neurons, through a pathway spatially and functionally distinct from Syt1-mediated synaptic vesicle release [PMID:21496647, PMID:28626000]. It forms disulfide-linked homodimers and heterodimers with synaptotagmins III, V, and VI via a conserved N-terminal cysteine motif, with the first cysteine being essential for stable dimer formation [PMID:10531343]. In hippocampal neurons, SYT10 expression is upregulated by pathological activity through the transcription factor NPAS4, and SYT10 is required for NPAS4-dependent neuroprotection against excitotoxicity [PMID:26936998]. SYT10 is also prominently expressed in the suprachiasmatic nucleus, where it contributes to photic entrainment of circadian rhythms [PMID:21921292].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing how SYT10 oligomerizes revealed that a conserved N-terminal cysteine motif mediates disulfide-dependent homo- and heterodimerization with synaptotagmins III, V, and VI, defining SYT10 as a member of a biochemically distinct synaptotagmin subclass.\",\n      \"evidence\": \"Site-directed mutagenesis of cysteine residues with co-immunoprecipitation under reducing and non-reducing conditions\",\n      \"pmids\": [\"10531343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional significance of heterodimer versus homodimer formation is unknown\",\n        \"Whether dimerization is required for Ca²⁺-dependent exocytosis has not been tested\",\n        \"No structural data on the dimer interface\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Cloning of human SYT10 established its primary structure — a 523-amino acid protein with a transmembrane domain and two C2 domains — and revealed restricted peripheral expression in pancreas, lung, and kidney, complementing its known neural expression.\",\n      \"evidence\": \"cDNA library screening and RT-PCR tissue survey\",\n      \"pmids\": [\"14756426\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No protein-level validation of tissue expression\",\n        \"Ca²⁺-binding properties of the C2 domains were not characterized\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The central mechanistic question — what cargo SYT10 senses Ca²⁺ for — was answered: SYT10 localizes to IGF-1-containing somatodendritic vesicles in olfactory neurons and is the Ca²⁺-sensor triggering their exocytosis, with Syt10 knockout abolishing activity-dependent IGF-1 secretion, reducing neuronal size and synapse number, phenotypes rescued by exogenous IGF-1.\",\n      \"evidence\": \"Syt10 knockout mice, live-cell colocalization imaging, Ca²⁺-dependent exocytosis assays, IGF-1 rescue experiments\",\n      \"pmids\": [\"21496647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism of Ca²⁺ sensing (which C2 domain, Ca²⁺ affinity) is unresolved\",\n        \"Whether SYT10 directly binds the vesicle SNARE machinery has not been shown\",\n        \"Role in non-olfactory neuronal populations not addressed\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Prominent SYT10 expression in the suprachiasmatic nucleus and a subtle circadian phenotype in Syt10-Cre homozygous mice implicated SYT10 in photic entrainment, broadening its physiological scope beyond olfactory neurons.\",\n      \"evidence\": \"Syt10-Cre knock-in mice, reporter crosses, circadian locomotor activity and phase-delay assays\",\n      \"pmids\": [\"21921292\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The cargo vesicle and secreted factor in SCN neurons are unidentified\",\n        \"Phenotype is subtle and based on insertional disruption of one allele in Cre homozygotes\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"SYT10 was placed downstream of the transcription factor NPAS4 in an activity-dependent neuroprotective pathway: NPAS4 drives Syt10 upregulation upon excitotoxic stimulation, and Syt10 is required for NPAS4-mediated neuronal survival, establishing a transcriptional–secretory axis against neurodegeneration.\",\n      \"evidence\": \"Syt10 knockout mice, kainic acid excitotoxicity model, genetic epistasis between NPAS4 and Syt10, neuronal survival assays\",\n      \"pmids\": [\"26936998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the neuroprotective cargo released downstream of SYT10 in hippocampal neurons is unknown\",\n        \"Whether IGF-1 is the effector in this context, as in olfactory neurons, has not been tested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"An unbiased RNAi screen extended SYT10's role to neuroendocrine dense-core vesicle exocytosis beyond the nervous system, confirming it as a general positive regulator of Ca²⁺-dependent regulated secretion.\",\n      \"evidence\": \"RNAi screen of ~139 C2-domain proteins in BON neuroendocrine cells measuring DCV exocytosis\",\n      \"pmids\": [\"28626000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Hit identified in a screen; individual rescue or overexpression validation not reported\",\n        \"Specific DCV cargo regulated by SYT10 in neuroendocrine cells is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the Ca²⁺-binding properties and SNARE-interaction mechanism of SYT10's C2 domains, the identity of its cargo in hippocampal and SCN neurons, and whether its dimerization with other synaptotagmins modulates vesicle fusion specificity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No reconstituted fusion assay with purified SYT10\",\n        \"No structural model of SYT10 C2 domains bound to Ca²⁺ or membranes\",\n        \"Functional role of heterodimerization in vivo is untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 3, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SYT3\",\n      \"SYT5\",\n      \"SYT6\",\n      \"NPAS4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}