{"gene":"UNC13A","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":1997,"finding":"Munc13-1 directly interacts with the N-terminal coiled-coil domain of syntaxin-1 via its C-terminus, demonstrated by three independent methods (in vitro binding, yeast two-hybrid, co-immunoprecipitation). Through this interaction, Munc13-1 binds a subpopulation of the SNARE core complex (synaptobrevin/SNAP-25/syntaxin). The syntaxin-binding site overlaps with that of Munc18, suggesting competition for syntaxin binding.","method":"Yeast two-hybrid, GST pulldown, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — three independent biochemical methods in a single study demonstrating direct protein-protein interaction with mapped binding domains","pmids":["8999968"],"is_preprint":false},{"year":1998,"finding":"Munc13-1 is a high-affinity presynaptic phorbol ester and diacylglycerol receptor with ligand affinities similar to protein kinase C. Phorbol ester binding causes Munc13-1 to associate with the plasma membrane, and overexpression of Munc13-1 presynaptically in the Xenopus neuromuscular junction enhances transmitter release in a phorbol ester-dependent manner.","method":"Radioligand binding assay, immunofluorescence membrane translocation, Xenopus NMJ electrophysiology overexpression","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct biochemical binding assays combined with functional in vivo overexpression at the NMJ, replicated across multiple experimental systems","pmids":["9697857"],"is_preprint":false},{"year":1999,"finding":"Munc13-1 is essential for synaptic vesicle maturation (priming) to a fusion-competent state at glutamatergic synapses. Hippocampal neurons from Munc13-1 knockout mice form ultrastructurally normal synapses but cannot release transmitter in response to action potentials, Ca2+-ionophores, or hypertonic sucrose, while α-latrotoxin-evoked release is unaffected. GABAergic synapses are unaffected, demonstrating transmitter-specific priming mechanisms.","method":"Munc13-1 knockout mice, electrophysiology, electron microscopy","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with multiple orthogonal release-triggering stimuli, replicated across multiple synaptic contexts","pmids":["10440375"],"is_preprint":false},{"year":2001,"finding":"Munc13-1 functionally interacts with the active zone protein RIM1 (a Rab3 effector). Disruption of the Munc13-1/RIM1 interaction causes loss of fusion-competent synaptic vesicles, phenocopying Munc13-1-deficient neurons. RIM1 binding and vesicle priming are mediated by two distinct structural modules of Munc13-1.","method":"Co-immunoprecipitation, dominant-negative disruption, electrophysiology in cultured neurons","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal protein interaction plus functional epistasis with defined domain mapping, multiple orthogonal methods","pmids":["11343654"],"is_preprint":false},{"year":2002,"finding":"CAST (CAZ-associated structural protein) forms a ternary complex with RIM1 and Munc13-1 at the cytomatrix of the active zone. CAST binds RIM1 directly and Munc13-1 indirectly through RIM1, and Bassoon is also associated with this complex.","method":"Co-immunoprecipitation, yeast two-hybrid, immunolocalization","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays in a single lab establishing ternary complex, but indirect Munc13-1 interaction via RIM1","pmids":["12163476"],"is_preprint":false},{"year":2005,"finding":"The minimal priming domain of Munc13-1 resides in its C-terminal residues 1100–1735, which contains both Munc13 homology domains and the C-terminal C2 domain. Point mutations that abolish syntaxin-1 binding also abolish chromaffin granule priming activity, establishing that Munc13-1's interaction with syntaxin-1 is required for its priming function.","method":"Munc13-1 deletion constructs in electrophysiological gain-of-function assay (chromaffin cell capacitance), point mutagenesis","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution-style deletion mapping combined with point mutagenesis and functional electrophysiological readout in a single study","pmids":["16271475"],"is_preprint":false},{"year":2005,"finding":"NMR structure of the Munc13-1 C1 domain reveals that a conserved tryptophan (Trp-588) occludes the DAG/phorbol ester binding site, requiring a conformational change for ligand binding. This structural feature distinguishes Munc13-1 from PKC C1 domains and is predicted to require higher DAG levels for activation.","method":"NMR spectroscopy (3D structure determination)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution NMR structure with detailed mechanistic interpretation; single lab but rigorous structural method","pmids":["15667202"],"is_preprint":false},{"year":2006,"finding":"Crystal structures of the Munc13-1 C2A domain homodimer (1.44 Å) and the Munc13-1 C2A/RIM zinc-finger domain heterodimer (1.78 Å) reveal that homodimerization (via four-stranded concave face) and heterodimerization (via bottom tip and C-terminal helix) are mutually exclusive, suggesting a homodimer-to-heterodimer switch that may regulate vesicle priming and presynaptic plasticity.","method":"X-ray crystallography guided by NMR experiments","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structures of both complexes in a single study with NMR validation, demonstrating competitive binding mechanism","pmids":["16732694"],"is_preprint":false},{"year":2006,"finding":"Active zone recruitment of Munc13-1 and ubMunc13-2 depends on their binding to RIM1α. A single point mutation (I121N) abolishes RIM1α binding in vitro and in cells; RIM1α-binding-deficient ubMunc13-2(I121N) is not recruited to synapses. Munc13-1 levels are reduced and improperly enriched at active zones in RIM1α-deficient brains.","method":"Mutagenesis, co-immunoprecipitation, immunofluorescence in cultured neurons and brain sections, RIM1α knockout mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — point mutagenesis combined with KO mice and multiple localization assays, functionally linking RIM1α binding to active zone recruitment","pmids":["16704978"],"is_preprint":false},{"year":2007,"finding":"Activation of the Munc13-1 C1 domain by phorbol ester (PDBu) lowers the energy barrier for synaptic vesicle fusion without changing the size of the readily releasable pool. The C1 domain mutation H567K (PDBu-binding deficient) mimics the PDBu-activated state, acting as a constitutive gain-of-function that increases vesicular release rate. This defines a two-state regulatory model analogous to PKC.","method":"Knockin mice (Munc13-1-H567K), osmotic release, Ca2+-triggered and spontaneous release electrophysiology","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockin mouse model with multiple orthogonal electrophysiological assays, clean separation of pool size versus release rate","pmids":["17267576"],"is_preprint":false},{"year":2007,"finding":"Munc13-1 is required for Gq-coupled receptor (histamine H1 receptor) potentiation of exocytosis via PLC/DAG signaling in chromaffin cells. The DAG-insensitive Munc13-1(H567K) completely abolished histamine-induced potentiation, while PKC inhibition had no effect, establishing that Munc13-1 is the downstream effector of PLC for rapid exocytotic potentiation.","method":"Adenoviral overexpression, capacitance measurements, pharmacological dissection","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative approach with pharmacological controls in a single lab identifying specific pathway dependence","pmids":["17202488"],"is_preprint":false},{"year":2006,"finding":"Munc13-1 is expressed in pancreatic islet beta cells and is required for glucose-stimulated insulin secretion. Heterozygous Munc13-1 (+/-) knockout mice show reduced insulin secretion, impaired granule priming (reduced readily releasable pool and refilling), and abnormal glucose tolerance. The DAG-binding function of Munc13-1 contributes to phorbol ester-dependent potentiation of insulin secretion.","method":"Munc13-1 knockout and H567K knockin mice, intraperitoneal glucose tolerance test, patch-clamp capacitance measurements on beta cells","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic mouse models with multiple orthogonal assays (in vivo glucose tolerance, ex vivo patch-clamp) demonstrating functional requirement","pmids":["16644700"],"is_preprint":false},{"year":2006,"finding":"Munc13-1 is required for the sustained (second phase) insulin release from pancreatic beta cells upon prolonged stimulation. Munc13-1 knockout eliminates the second phase of insulin secretion, and the DAG-binding-deficient H567K knockin also reduces it, demonstrating DAG-dependent priming of insulin-containing LDCVs.","method":"Munc13-1 knockout and H567K knockin mice, insulin secretion assay from primary beta cells","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — two genetic mouse models (KO and KI) with functional secretion readouts, consistent results","pmids":["16697276"],"is_preprint":false},{"year":2009,"finding":"Domains of five active zone proteins (Aczonin/Piccolo, Bassoon, CAST1/ELKS2, RIM1, and Munc13-1) converge on an interaction node centered on the N-terminal region of Munc13-1. The zinc-finger domain of RIM1, the C-terminal region of Bassoon, a segment of CAST1/ELKS2, and the CC3 domain of Aczonin/Piccolo all bind the Munc13-1 N-terminal region.","method":"Yeast two-hybrid, co-immunoprecipitation, recombinant domain binding assays","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple protein interactions mapped by yeast two-hybrid and pulldown in one study, but predominantly single-method for each pairwise interaction","pmids":["19812333"],"is_preprint":false},{"year":2011,"finding":"The interaction between RIM1α and Munc13-1 is required for presynaptic long-term potentiation (LTP) at hippocampal mossy fiber synapses. Using acute in vivo expression of Munc13-1 variants in which the RIM-binding domain is selectively disrupted, Munc13-1 was shown to be an effector of RIM1α in presynaptic LTP, implicating modulation of vesicle priming as the cellular substrate for LTP expression.","method":"In vivo viral expression of Munc13-1 domain mutants, electrophysiology at hippocampal mossy fiber synapses","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific disruption with functional epistasis in vivo, but single lab","pmids":["21849565"],"is_preprint":false},{"year":2013,"finding":"Munc13-1 is a major presynaptic target of Ca2+/calmodulin signaling that controls synaptic vesicle replenishment and short-term plasticity. Knockin mice expressing a Ca2+/calmodulin-insensitive Munc13-1(W464R) variant show slower SV replenishment, aberrant short-term depression, and reduced recovery from synaptic depression at the calyx of Held.","method":"Knockin mice (Munc13-1-W464R), electrophysiology at calyx of Held","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — precisely engineered knockin mouse with functional synaptic readout at a well-characterized synapse, establishing specific molecular mechanism","pmids":["23770256"],"is_preprint":false},{"year":2013,"finding":"Munc13-1 translocates to the plasma membrane in a Doc2B- and calcium-dependent manner. When co-expressed with Doc2B, Munc13-1 co-translocates upon Ca2+ elevation but at a slower rate, and accumulates on the membrane after stimulation in a DAG-dependent manner (abrogated by H567K mutation). Doc2B thus enables a Ca2+- and DAG-dependent recruitment of Munc13-1 to the plasma membrane.","method":"Live-cell fluorescence imaging of GFP-tagged proteins in PC12 cells, Ca2+ stimulation","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — live imaging with functional mutagenesis (H567K) providing mechanistic insight, single lab","pmids":["24062723"],"is_preprint":false},{"year":2013,"finding":"β-adrenergic receptor activation translocates Munc13-1 from soluble to particulate (membrane) fractions via a cAMP/Epac/PLC/DAG pathway and enhances the Rab3A–RIM1α interaction, redistributing synaptic vesicles closer to the presynaptic membrane and increasing glutamate release at cerebrocortical terminals.","method":"Subcellular fractionation, co-immunoprecipitation, glutamate release assay from synaptosomes, electron microscopy","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods in single lab establishing pathway position and membrane translocation of Munc13-1","pmids":["24036110"],"is_preprint":false},{"year":2017,"finding":"A de novo Pro814Leu variant in UNC13A (Munc13-1) causes a dominant gain-of-function characterized by increased synaptic vesicle fusion propensity, increased initial release probability, and abnormal short-term synaptic plasticity. This was demonstrated in murine neuronal cultures and in C. elegans expressing the variant.","method":"Electrophysiology in murine neuronal cultures, C. elegans functional assays, whole-exome sequencing","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — variant function validated in two independent biological systems (mouse neurons and C. elegans) with electrophysiological readouts","pmids":["28192369"],"is_preprint":false},{"year":2017,"finding":"Munc13-1 forms discrete supramolecular self-assemblies in presynaptic terminals that serve as independent vesicular release sites by recruiting syntaxin-1. The multiplicity of these assemblies sets synaptic weight, with each assembly functioning as an independent release site.","method":"Single-synapse glutamate imaging, super-resolution (STORM/PALM) microscopy, correlative functional and structural analysis","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — super-resolution imaging combined with functional single-synapse measurements in a single study, establishing direct structure-function link","pmids":["29230050"],"is_preprint":false},{"year":2018,"finding":"TNF-α impedes Fbxo45-dependent ubiquitination of Munc13-1 in the spinal dorsal horn, causing Munc13-1 accumulation at presynaptic sites. Neuropathic injury decreases Fbxo45 expression and Fbxo45–Munc13-1 co-precipitation, increasing mEPSC frequency. Spinal Munc13-1 knockdown attenuates allodynia, establishing Fbxo45 as the E3 ubiquitin ligase targeting Munc13-1 for degradation.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, patch-clamp electrophysiology, behavioral testing in rats","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods in a single lab establishing Fbxo45 as the writer for Munc13-1 ubiquitination with functional consequences","pmids":["30042425"],"is_preprint":false},{"year":2019,"finding":"Munc13-1 bridges the synaptic vesicle and plasma membranes through its elongated C1C2BMUNC2C region. Mutations in membrane-binding sites of the C2C domain disrupt liposome bridging, liposome fusion in vitro, and synaptic vesicle docking, priming, and Ca2+-triggered neurotransmitter release in mouse neurons, with a single residue substitution nearly abolishing release.","method":"Liposome bridging and fusion assays, mutagenesis, electrophysiology in mouse neurons, electron microscopy (vesicle docking)","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis combined with neuronal electrophysiology and EM, multiple orthogonal methods establishing membrane bridging as central function","pmids":["30816091"],"is_preprint":false},{"year":2019,"finding":"The MUN domain of Munc13-1 stabilizes the Munc18-1/syntaxin-1/VAMP2 template complex by ~2.1 kBT, as measured by single-molecule force spectroscopy. The MUN-bound template complex enhances SNAP-25 binding and promotes full SNARE assembly. Mutational studies confirm functional importance for SNARE assembly and neurotransmitter release.","method":"Single-molecule force spectroscopy, SNARE assembly assays, mutagenesis","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — novel single-molecule biophysical method with mutagenesis and functional SNARE assembly assays in a single study","pmids":["31888993"],"is_preprint":false},{"year":2019,"finding":"RIM-BP2 promotes synaptic vesicle priming and release probability at hippocampal mossy fiber synapses via stabilization of Munc13-1 at the active zone. At CA3-CA1 synapses, RIM-BP2 loss only affects Ca2+-secretion coupling without affecting Munc13-1-dependent priming, demonstrating synapse type-specific RIM-BP2/Munc13-1 functional interactions.","method":"RIM-BP2 knockout mice, electrophysiology at two synapse types, immunostaining/quantification of Munc13-1 levels","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice with functional and localization analysis at two synapse types, single lab","pmids":["31535974"],"is_preprint":false},{"year":2020,"finding":"NMR spectroscopy, SNARE complex assembly experiments, and liposome fusion assays demonstrate that Munc13-1 facilitates opening of syntaxin-1 via interactions with the syntaxin-1 linker region (very weak binding but functionally critical) rather than via the syntaxin-1 SNARE motif. Munc13-1 cannot be replaced by an artificial tethering factor for liposome fusion, indicating it has an active role beyond membrane bridging.","method":"NMR spectroscopy, SNARE complex assembly assays, liposome fusion reconstitution, mutagenesis","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical/biophysical methods in a single rigorous study with mutagenesis dissecting the syntaxin-opening mechanism","pmids":["32086964"],"is_preprint":false},{"year":2021,"finding":"Munc13-1 must self-assemble into clusters on supported lipid bilayers to efficiently capture and retain synaptic vesicles. Purified Munc13-1 forms clusters of 2–20 copies, but only clusters of ≥6 copies efficiently capture vesicles. The C2C domain is not required for clustering but is required for efficient vesicle capture via electrostatic and hydrophobic interactions.","method":"Reconstitution on supported lipid bilayers, TIRF microscopy, stepwise photobleaching, domain deletion analysis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with quantitative single-molecule imaging and domain mapping, single lab","pmids":["34227103"],"is_preprint":false},{"year":2021,"finding":"The C1-C2B region of Munc13-1 has two distinct membrane-binding faces. Mutations in the polybasic face (K603E, R769E) severely impair Ca2+-independent liposome bridging/fusion and synaptic vesicle priming. A K706E mutation in the C2B Ca2+-binding loops impairs Ca2+-evoked release. The polybasic face primarily controls vesicle priming while the DAG/Ca2+/PIP2-binding face modulates Ca2+-evoked release.","method":"In vitro liposome bridging/fusion reconstitution, point mutagenesis, electrophysiology in murine hippocampal cultures","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with structure-guided mutagenesis combined with neuronal electrophysiology, multiple orthogonal methods in a single study","pmids":["34779770"],"is_preprint":false},{"year":2021,"finding":"Munc13-1 regulates synaptic vesicle replenishment via Ca2+/phospholipid-dependent binding through its C2B domain. Knockin mice with mutations abolishing Ca2+/phospholipid binding show increased synaptic depression and slower SV pool recovery; mutations enhancing binding have opposite effects. This identifies Ca2+/phospholipid binding to Munc13-1 C2B as a core mechanism accelerating SV resupply.","method":"Knockin mice with C2B domain point mutations, electrophysiology at calyx of Held","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — two complementary knockin mouse lines (loss- and gain-of-function) with functional electrophysiological readouts, consistent bidirectional phenotypes","pmids":["34706220"],"is_preprint":false},{"year":2022,"finding":"TDP-43 represses a cryptic exon in UNC13A pre-mRNA. Loss of TDP-43 from the nucleus in human brain, neuronal cell lines, and iPSC-derived motor neurons results in inclusion of a cryptic exon in UNC13A mRNA and reduced UNC13A protein expression. Risk SNPs for FTD/ALS located within the intron containing the cryptic exon increase cryptic exon inclusion in the context of TDP-43 dysfunction.","method":"TDP-43 knockdown in human neuronal cell lines and iPSC-derived motor neurons, RT-PCR, Western blot, RNA-seq, postmortem human brain analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple human cellular systems and postmortem brain, replicated independently by two concurrent groups, mechanistically linking TDP-43 loss to UNC13A protein depletion","pmids":["35197626","35197628"],"is_preprint":false},{"year":2022,"finding":"TDP-43 depletion induces robust cryptic exon inclusion in UNC13A, resulting in nonsense-mediated decay and loss of UNC13A protein. Two common intronic UNC13A polymorphisms (rs12608932 and rs12973192) associated with ALS/FTD risk overlap with TDP-43 binding sites and potentiate cryptic exon inclusion both in cultured cells and in patient brain/spinal cord.","method":"TDP-43 knockdown, RT-PCR, minigene splicing assays, postmortem ALS/FTD patient brain and spinal cord analysis, cell-based NMD assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic link between specific SNPs and TDP-43 binding sites established by minigene assays, confirmed in patient tissue, independent replication concurrent with PMID 35197626","pmids":["35197628"],"is_preprint":false},{"year":2022,"finding":"Paramagnetic NMR (pseudocontact shifts and residual dipolar couplings) of the Calmodulin/Munc13-1 complex reveals highly flexible interdomain motion. A genetic algorithm ensemble approach characterized the conformational space of the CaM/Munc13-1 complex without prior crystallographic knowledge.","method":"Paramagnetic NMR spectroscopy (pseudocontact shifts, residual dipolar couplings), molecular mechanics ensemble calculation","journal":"Journal of the American Chemical Society","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous NMR structural approach but single lab with no functional validation of structural model","pmids":["36082939"],"is_preprint":false},{"year":2023,"finding":"TDP-43's extreme N-terminus is important for repression of UNC13A cryptic exon inclusion. Additionally, hnRNP L, hnRNP A1, and hnRNP A2B1 bind UNC13A RNA and repress cryptic exon inclusion independently of TDP-43. Higher hnRNP L protein levels associate with lower burden of UNC13A cryptic RNA in ALS/FTD brains.","method":"TDP-43 domain-deletion constructs, RNA immunoprecipitation, minigene splicing assays, patient brain correlative analysis","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping and RIP assays combined with patient brain data, single lab","pmids":["36930682"],"is_preprint":false},{"year":2024,"finding":"The N-terminal C2A and CaM-binding (CaMb) domains of Munc13-1 interact with its own MUN domain (intramolecular autoinhibition), suppressing SNARE complex assembly and liposome fusion activity. These inhibitory interactions are relieved by RIM2α zinc-finger domain (relieving C2A-MUN interaction) and calmodulin (relieving CaMb-MUN interaction), providing a mechanism for dual regulation of Munc13-1 activity.","method":"Purification of full-length Munc13-1 fragment, liposome fusion assays, NMR spectroscopy","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — first purification of near-full-length Munc13-1, in vitro reconstitution with mutagenesis and NMR, multiple orthogonal methods establishing autoinhibitory mechanism","pmids":["38417672"],"is_preprint":false},{"year":2024,"finding":"TDP-43 loss of function induces severe reduction in synaptic transmission and asynchronous network activity. These deficits are largely driven by a cryptic exon in UNC13A. Antisense oligonucleotides (ASOs) targeting the UNC13A cryptic exon robustly rescue UNC13A protein levels and restore normal synaptic function.","method":"TDP-43 depletion in neuronal cultures, multi-electrode array recordings, ASO treatment, Western blot","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue experiment with ASO demonstrating causal role of UNC13A cryptic exon in synaptic dysfunction, preprint status reduces confidence","pmids":["38979232"],"is_preprint":true},{"year":2024,"finding":"Differential SNARE chaperoning by Munc13-1 and Munc18-1 regulates fusion pore fate. Munc13-1 clusters multiple SNARE complexes at the release site and synchronizes release events, while Munc18-1 stoichiometrically interacts with trans-SNARE complexes to enhance N-to-C-terminal zippering. Together, both proteins differentially access dynamic trans-SNARE complexes to regulate pore properties.","method":"Single-molecule fusion pore assay, SNARE reconstitution, fluorescence imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule reconstitution with functional pore measurement, multiple orthogonal observations in a single study","pmids":["38755165"],"is_preprint":false},{"year":2024,"finding":"A negatively charged polyE sequence in the N-terminus of Munc13-1 binds the MUN domain via charge-charge interactions, inhibiting MUN-mediated SNARE complex assembly. Ca2+ ions (~40 μM, comparable to local presynaptic Ca2+ from a single action potential) compete with the polyE-MUN interaction to relieve autoinhibition and enhance neurotransmitter release. Pseudophosphorylated mutations in the MUN domain that disrupt polyE binding enhance release.","method":"In vitro binding assays, SNARE assembly assays, mutagenesis (pseudophosphorylation), electrophysiology in neurons","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution of autoinhibitory mechanism combined with neuronal electrophysiology and specific mutagenesis, multiple orthogonal methods","pmids":["40489622"],"is_preprint":false},{"year":2025,"finding":"Pathogenic germline coding or splice-site UNC13A variants cause a neurodevelopmental syndrome through three distinct mechanisms: (1) reduced UNC13A protein expression causing loss of synaptic strength, (2) gain-of-function UNC13A variants causing increased neurotransmission, and (3) impaired regulation of neurotransmission by second messenger signaling. These mechanisms were validated in mouse hippocampal neurons and C. elegans.","method":"Variant expression in mouse hippocampal neurons, C. elegans functional assays, electrophysiology, genotype-phenotype correlation","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple pathogenic variants characterized in two independent biological systems with electrophysiological readouts, strong genotype-phenotype-functional correlation","pmids":["41125872"],"is_preprint":false},{"year":2025,"finding":"ALS-associated RNA-binding proteins MATR3, FUS, and hnRNPA1 promote UNC13A transcription by binding to and downregulating REST mRNA, thereby relieving REST-mediated transcriptional repression of UNC13A. Loss of these RBPs in cultured cells or ALS patient motor neurons leads to REST overexpression and reduced UNC13A levels.","method":"siRNA knockdown, RT-PCR, Western blot, RNA immunoprecipitation, iPSC-derived motor neurons from ALS patients","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple RBP knockdowns with consistent REST-UNC13A pathway effects, validated in patient-derived neurons, single lab","pmids":["40707625"],"is_preprint":false},{"year":2023,"finding":"Unc13A's calmodulin-binding (CaM) domain mutation in Drosophila increases baseline transmission while blocking both short-term facilitation and presynaptic homeostatic potentiation. Mathematical modeling suggests Ca2+/calmodulin/Unc13A interaction plastically stabilizes vesicle priming at release sites, and CaM-domain mutation causes constitutive stabilization, occluding activity-dependent plasticity. STED microscopy shows CaM-domain mutation shifts Unc13A MUN domain closer to release sites.","method":"Drosophila NMJ electrophysiology, STED super-resolution microscopy, mathematical modeling, mutagenesis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional mutagenesis combined with super-resolution microscopy and electrophysiology in Drosophila, supported by mathematical modeling","pmids":["37243591"],"is_preprint":false}],"current_model":"UNC13A/Munc13-1 is a large multidomain presynaptic active zone protein that functions as an essential synaptic vesicle priming factor by: (1) opening syntaxin-1 from its closed autoinhibited state via weak interactions with the syntaxin-1 linker region; (2) bridging synaptic vesicle and plasma membranes through opposite ends of its elongated C1C2BMUNC2C structure, with the C2C domain contacting the vesicle membrane; (3) chaperoning SNARE complex assembly by stabilizing the Munc18-1/syntaxin-1/VAMP2 template complex through its MUN domain; (4) serving as a convergence point for multiple regulatory signals—diacylglycerol/phorbol ester via its C1 domain lowers the energy barrier for fusion, Ca2+/calmodulin via the CaMb domain and Ca2+/phospholipid via the C2B domain accelerate SV replenishment and control short-term plasticity, and the C2A domain homodimer/RIM heterodimer switch links priming to presynaptic long-term plasticity; (5) forming supramolecular self-assemblies at active zones that define the number of independent release sites and thereby set synaptic weight; and (6) being recruited to active zones by RIM1α binding. In disease contexts, nuclear loss of TDP-43 de-represses a cryptic exon in UNC13A pre-mRNA, causing nonsense-mediated decay and UNC13A protein depletion, which is potentiated by ALS/FTD-risk SNPs overlapping TDP-43 binding sites in the cryptic exon-containing intron, directly linking TDP-43 proteinopathy to impaired synaptic transmission."},"narrative":{"mechanistic_narrative":"UNC13A/Munc13-1 is an essential presynaptic active zone protein that primes synaptic vesicles to a fusion-competent state, a function required for evoked neurotransmitter release at glutamatergic synapses [PMID:10440375]. It executes priming by directly engaging the SNARE machinery: it binds syntaxin-1 and facilitates its opening from the autoinhibited state through weak but functionally critical contacts with the syntaxin-1 linker, an active role that cannot be substituted by a passive tethering factor [PMID:8999968, PMID:32086964]. Its elongated C1C2BMUNC2C module physically bridges the synaptic vesicle and plasma membranes—with the C2C domain contacting the vesicle membrane and a polybasic C1-C2B face controlling priming—so that point mutations in these surfaces disrupt liposome bridging, vesicle docking, and Ca2+-triggered release [PMID:30816091, PMID:34779770]. The MUN domain chaperones SNARE assembly by stabilizing the Munc18-1/syntaxin-1/VAMP2 template complex and clustering SNARE complexes to synchronize release [PMID:31888993, PMID:38755165]. Munc13-1 is a convergence point for multiple regulatory inputs: diacylglycerol/phorbol ester acting through its C1 domain lowers the energy barrier for fusion and mediates Gq/PLC-coupled potentiation [PMID:17267576, PMID:17202488], while Ca2+/calmodulin and Ca2+/phospholipid binding through the CaM-binding and C2B domains accelerate vesicle replenishment and control short-term plasticity [PMID:23770256, PMID:34706220]. Its activity is held in check by intramolecular autoinhibition, in which the N-terminal C2A, CaM-binding, and acidic polyE segments engage the MUN domain to suppress SNARE assembly; this is relieved by RIM zinc-finger binding, calmodulin, and Ca2+ [PMID:38417672, PMID:40489622]. Munc13-1 is recruited to and stabilized at the active zone through RIM1α binding and forms supramolecular self-assemblies that define independent release sites and thereby set synaptic weight [PMID:16704978, PMID:29230050]. Beyond neurons, Munc13-1 primes insulin granules and is required for glucose-stimulated insulin secretion [PMID:16644700, PMID:16697276]. Germline coding and splice-site UNC13A variants cause a neurodevelopmental syndrome through reduced expression, gain-of-function increases in neurotransmission, or impaired second-messenger regulation [PMID:28192369, PMID:41125872], and nuclear loss of TDP-43 de-represses a cryptic exon in UNC13A pre-mRNA that triggers nonsense-mediated decay and protein depletion, mechanistically linking TDP-43 proteinopathy in ALS/FTD to synaptic failure [PMID:35197626, PMID:35197628].","teleology":[{"year":1997,"claim":"Established the first molecular link between Munc13-1 and the fusion machinery by showing it physically engages syntaxin-1 and the SNARE core complex, raising the question of how it intersects Munc18 function.","evidence":"Yeast two-hybrid, GST pulldown, and co-immunoprecipitation mapping the C-terminal syntaxin-binding site","pmids":["8999968"],"confidence":"High","gaps":["Functional consequence of syntaxin binding not yet shown","Mechanism of competition with Munc18 not resolved"]},{"year":1998,"claim":"Defined Munc13-1 as a high-affinity DAG/phorbol ester receptor whose membrane translocation enhances release, identifying it as a presynaptic second-messenger effector.","evidence":"Radioligand binding, membrane translocation imaging, and Xenopus NMJ overexpression electrophysiology","pmids":["9697857"],"confidence":"High","gaps":["Endogenous role versus overexpression artifact not yet distinguished","Structural basis of the C1-membrane interaction unknown"]},{"year":1999,"claim":"Demonstrated that Munc13-1 is essential and acts specifically at the vesicle priming step, since knockout neurons form normal synapses but cannot release transmitter.","evidence":"Munc13-1 knockout mice with electrophysiology across multiple release stimuli and electron microscopy","pmids":["10440375"],"confidence":"High","gaps":["Transmitter-specific (glutamate vs GABA) basis not explained molecularly","Biochemical mechanism of priming not defined"]},{"year":2001,"claim":"Placed Munc13-1 in the active zone protein network by showing its RIM1 interaction is required for generating fusion-competent vesicles, separating priming from RIM binding into distinct modules.","evidence":"Co-immunoprecipitation, dominant-negative disruption, and electrophysiology in cultured neurons","pmids":["11343654"],"confidence":"High","gaps":["Whether RIM binding controls localization vs activity unresolved at this stage"]},{"year":2002,"claim":"Expanded the active zone scaffold to a ternary CAST/RIM1/Munc13-1 complex, integrating Munc13-1 into the cytomatrix.","evidence":"Co-immunoprecipitation, yeast two-hybrid, and immunolocalization","pmids":["12163476"],"confidence":"Medium","gaps":["Munc13-1 interaction is indirect via RIM1","Functional role of CAST for Munc13-1 not tested"]},{"year":2005,"claim":"Localized the minimal priming activity to the C-terminal C1C2BMUNC2C region and proved that syntaxin binding is required for priming function.","evidence":"Deletion constructs and point mutagenesis in a chromaffin cell capacitance gain-of-function assay; NMR structure of the C1 domain","pmids":["16271475","15667202"],"confidence":"High","gaps":["How the C1 Trp-588 occlusion is relieved in vivo unknown","Full-length structure not available"]},{"year":2006,"claim":"Resolved a C2A homodimer-to-RIM-heterodimer switch and established that RIM1α binding recruits Munc13-1 to the active zone, connecting localization to plasticity.","evidence":"Crystal structures of C2A homo- and heterodimers; point mutagenesis (I121N) plus RIM1α knockout mice and localization assays","pmids":["16732694","16704978"],"confidence":"High","gaps":["In vivo trigger of the dimer switch not demonstrated","Quantitative contribution of recruitment vs activation unclear"]},{"year":2006,"claim":"Generalized Munc13-1 priming function beyond neurons by showing it is required for glucose-stimulated and sustained-phase insulin secretion in pancreatic beta cells.","evidence":"Munc13-1 knockout and H567K knockin mice, glucose tolerance tests, beta-cell patch-clamp and secretion assays","pmids":["16644700","16697276"],"confidence":"High","gaps":["Whether the same SNARE-priming mechanism operates on LDCVs as on SVs not directly compared"]},{"year":2007,"claim":"Defined a two-state DAG/C1 regulatory model in which C1 activation lowers the fusion energy barrier without altering pool size, and identified Munc13-1 as the PLC effector for receptor-driven potentiation.","evidence":"Munc13-1-H567K knockin mice with multiple electrophysiological assays; chromaffin cell pharmacological dissection of Gq/PLC signaling","pmids":["17267576","17202488"],"confidence":"High","gaps":["Structural basis of the C1 conformational switch in situ not shown","Chromaffin pathway study is dominant-negative based"]},{"year":2009,"claim":"Mapped a convergence node on the Munc13-1 N-terminus where multiple active zone scaffold proteins bind, framing Munc13-1 as an organizing hub.","evidence":"Yeast two-hybrid, co-immunoprecipitation, and recombinant domain binding assays","pmids":["19812333"],"confidence":"Medium","gaps":["Most pairwise interactions are single-method","Functional hierarchy of these interactions untested"]},{"year":2013,"claim":"Identified Ca2+/calmodulin acting through the CaM-binding domain as the molecular controller of vesicle replenishment and short-term plasticity, and characterized Doc2B/Ca2+-dependent and β-adrenergic/cAMP-Epac-PLC recruitment of Munc13-1 to membranes.","evidence":"Munc13-1-W464R knockin mice at calyx of Held; live-cell imaging in PC12 cells; synaptosome fractionation, co-IP, glutamate release and EM","pmids":["23770256","24062723","24036110"],"confidence":"High","gaps":["Doc2B and β-adrenergic findings are single-lab","Integration of multiple signaling inputs at one molecule not quantitatively modeled"]},{"year":2011,"claim":"Linked RIM1α-Munc13-1 binding to presynaptic long-term potentiation, identifying vesicle-priming modulation as a cellular substrate for LTP.","evidence":"In vivo viral expression of RIM-binding-deficient Munc13-1 mutants with mossy fiber electrophysiology","pmids":["21849565"],"confidence":"Medium","gaps":["Single lab","Molecular event downstream of RIM binding during LTP not defined"]},{"year":2017,"claim":"Connected Munc13-1 dysfunction to human disease by showing a de novo P814L gain-of-function variant increases fusion propensity and disrupts plasticity, and resolved Munc13-1 self-assemblies as independent release sites that set synaptic weight.","evidence":"Variant electrophysiology in mouse neurons and C. elegans; super-resolution imaging with single-synapse glutamate measurements","pmids":["28192369","29230050"],"confidence":"High","gaps":["Molecular basis of the supramolecular assembly not structurally defined","Link between assembly number and release-site count mechanistically incomplete"]},{"year":2019,"claim":"Provided a unified membrane-bridging and SNARE-chaperoning mechanism, showing the C2C domain bridges vesicle and plasma membranes while the MUN domain stabilizes the Munc18-1 template complex to drive SNARE assembly.","evidence":"Liposome bridging/fusion reconstitution, single-molecule force spectroscopy, mutagenesis, neuronal electrophysiology and EM; RIM-BP2 knockout mice","pmids":["30816091","31888993","31535974"],"confidence":"High","gaps":["How bridging and chaperoning are temporally coordinated unresolved","Synapse-type specificity of RIM-BP2 effect not mechanistically explained"]},{"year":2020,"claim":"Demonstrated that Munc13-1 actively opens syntaxin-1 via weak linker-region binding rather than the SNARE motif, establishing a catalytic role beyond passive tethering.","evidence":"NMR, SNARE assembly assays, and liposome fusion reconstitution with mutagenesis","pmids":["32086964"],"confidence":"High","gaps":["Structural snapshot of the open-syntaxin intermediate lacking","Kinetics of opening in the full active zone context unknown"]},{"year":2021,"claim":"Dissected Munc13-1 membrane-binding surfaces and clustering requirements, separating the polybasic priming face from the DAG/Ca2+/PIP2 release-modulating face and showing ≥6-copy clusters are needed for vesicle capture.","evidence":"Supported-lipid-bilayer reconstitution with TIRF and photobleaching; point mutagenesis with liposome assays and neuronal electrophysiology; C2B Ca2+/phospholipid knockin mice at calyx of Held","pmids":["34227103","34779770","34706220"],"confidence":"High","gaps":["Physiological trigger of clustering in vivo not established","How distinct membrane faces are coordinated during a release cycle unclear"]},{"year":2022,"claim":"Revealed the disease-driving regulatory axis: nuclear TDP-43 loss de-represses a UNC13A cryptic exon causing NMD and protein depletion, potentiated by ALS/FTD-risk SNPs overlapping TDP-43 binding sites.","evidence":"TDP-43 knockdown in human neuronal lines and iPSC motor neurons, RT-PCR, minigene splicing, RNA-seq, NMD assays, and postmortem ALS/FTD tissue; replicated by two concurrent studies","pmids":["35197626","35197628"],"confidence":"High","gaps":["Quantitative contribution of UNC13A loss to ALS/FTD pathophysiology not yet established","Whether partial protein loss alone causes neurodegeneration unresolved"]},{"year":2023,"claim":"Broadened the splicing-control network and refined the calmodulin-priming model, identifying TDP-43's N-terminus and hnRNP L/A1/A2B1 as cryptic-exon repressors and showing CaM-domain control of vesicle stabilization and homeostatic plasticity.","evidence":"TDP-43 domain-deletion and RIP assays with patient brain correlation; Drosophila NMJ electrophysiology, STED microscopy, and mathematical modeling of CaM-domain mutants","pmids":["36930682","37243591"],"confidence":"Medium","gaps":["hnRNP findings are single-lab","How multiple RBPs cooperate on the cryptic exon not resolved"]},{"year":2024,"claim":"Established intramolecular autoinhibition as a core regulatory principle, showing N-terminal C2A/CaMb/polyE segments suppress MUN-driven SNARE assembly until relieved by RIM, calmodulin, or local Ca2+, and resolved how Munc13-1 vs Munc18-1 differentially chaperone SNAREs to control fusion pores; ASO rescue confirmed cryptic-exon causality.","evidence":"Near-full-length Munc13-1 purification with liposome fusion and NMR; biochemical/electrophysiological dissection of polyE-MUN-Ca2+ competition; single-molecule fusion-pore assays; ASO rescue of TDP-43-depleted neurons on multi-electrode arrays (preprint)","pmids":["38417672","38755165","40489622","38979232"],"confidence":"High","gaps":["How autoinhibitory inputs are integrated quantitatively in vivo unresolved","ASO rescue is preprint and not yet in vivo"]},{"year":2025,"claim":"Consolidated UNC13A as a Mendelian neurodevelopmental disease gene with three distinct variant mechanisms and identified an upstream transcriptional control axis through ALS-RBP-mediated REST regulation.","evidence":"Variant expression in mouse hippocampal neurons and C. elegans with genotype-phenotype correlation; RBP knockdowns, RIP, and patient iPSC motor neurons linking MATR3/FUS/hnRNPA1-REST to UNC13A transcription","pmids":["41125872","40707625"],"confidence":"High","gaps":["REST-axis study is single-lab","Relative contribution of transcriptional vs splicing regulation to disease in patients not quantified"]},{"year":null,"claim":"How the multiple, overlapping regulatory inputs (DAG/C1, Ca2+/calmodulin, Ca2+/phospholipid, RIM, polyE autoinhibition, clustering) are integrated in real time at a single active zone to set release probability and plasticity remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No integrated structural model of full-length Munc13-1 in the active zone","Temporal coordination of autoinhibition relief with Ca2+ influx during an action potential not directly observed","Therapeutic correction of UNC13A loss not validated in vivo"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[22,24,32,34]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1,21,26]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,19,21,22]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,15,27,32]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[9,15,27,35]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,16,17,19,21]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[16,17]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,9,15,19,27]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[3,8,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[18,28,29,36]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,17]}],"complexes":["active zone cytomatrix (CAST/RIM1/Munc13-1/Bassoon)","Munc18-1/syntaxin-1/VAMP2 template complex","Munc13-1 supramolecular release-site assembly"],"partners":["STX1A","RIMS1","UNC18-1/STXBP1","VAMP2","CALM1","DOC2B","ERC1/CAST","RIMBP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UPW8","full_name":"Protein unc-13 homolog A","aliases":["Munc13-1"],"length_aa":1703,"mass_kda":193.0,"function":"Plays a role in vesicle maturation during exocytosis as a target of the diacylglycerol second messenger pathway. Involved in neurotransmitter release by acting in synaptic vesicle priming prior to vesicle fusion and participates in the activity-dependent refilling of readily releasable vesicle pool (RRP). Essential for synaptic vesicle maturation in most excitatory/glutamatergic but not inhibitory/GABA-mediated synapses. Facilitates neuronal dense core vesicles fusion as well as controls the location and efficiency of their synaptic release (By similarity). Also involved in secretory granule priming in insulin secretion. Plays a role in dendrite formation by melanocytes (PubMed:23999003)","subcellular_location":"Cytoplasm; Cell membrane; Presynaptic cell membrane; Presynaptic active zone","url":"https://www.uniprot.org/uniprotkb/Q9UPW8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/UNC13A","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/UNC13A","total_profiled":1310},"omim":[{"mim_id":"621457","title":"INTELLECTUAL DEVELOPMENTAL DISORDER WITH SEIZURES AND DYSMORPHIC FACIES; IDDSF","url":"https://www.omim.org/entry/621457"},{"mim_id":"621456","title":"NEURODEVELOPMENTAL DISORDER WITH SPEECH DELAY, MOVEMENT ABNORMALITIES, AND SEIZURES; NEDSMS","url":"https://www.omim.org/entry/621456"},{"mim_id":"621455","title":"NEURODEVELOPMENTAL DISORDER WITH HYPOTONIA, EPILEPSY, AND ABSENT SPEECH; NEDHES","url":"https://www.omim.org/entry/621455"},{"mim_id":"619305","title":"TANDEM C2 DOMAINS PROTEIN, NUCLEAR; TC2N","url":"https://www.omim.org/entry/619305"},{"mim_id":"617250","title":"ELKS/RAB6-INTERACTING/CAST FAMILY, MEMBER 2; ERC2","url":"https://www.omim.org/entry/617250"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":40.0},{"tissue":"pituitary gland","ntpm":30.1},{"tissue":"retina","ntpm":17.1}],"url":"https://www.proteinatlas.org/search/UNC13A"},"hgnc":{"alias_symbol":["KIAA1032","Munc13-1"],"prev_symbol":[]},"alphafold":{"accession":"Q9UPW8","domains":[{"cath_id":"2.60.40.150","chopping":"3-151","consensus_level":"high","plddt":83.6764,"start":3,"end":151},{"cath_id":"-","chopping":"514-672_814-911","consensus_level":"medium","plddt":84.1559,"start":514,"end":911},{"cath_id":"2.60.40.150","chopping":"686-793","consensus_level":"high","plddt":80.9568,"start":686,"end":793},{"cath_id":"-","chopping":"918-991","consensus_level":"medium","plddt":87.6823,"start":918,"end":991},{"cath_id":"-","chopping":"1000-1138","consensus_level":"high","plddt":89.9892,"start":1000,"end":1138},{"cath_id":"1.10.357.50","chopping":"1151-1328_1340-1396","consensus_level":"medium","plddt":90.9754,"start":1151,"end":1396},{"cath_id":"2.60.40.150","chopping":"1504-1690","consensus_level":"high","plddt":84.7933,"start":1504,"end":1690}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UPW8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UPW8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UPW8-F1-predicted_aligned_error_v6.png","plddt_mean":73.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=UNC13A","jax_strain_url":"https://www.jax.org/strain/search?query=UNC13A"},"sequence":{"accession":"Q9UPW8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UPW8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UPW8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UPW8"}},"corpus_meta":[{"pmid":"10440375","id":"PMC_10440375","title":"Munc13-1 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   \"finding\": \"Munc13-1 directly interacts with the N-terminal coiled-coil domain of syntaxin-1 via its C-terminus, demonstrated by three independent methods (in vitro binding, yeast two-hybrid, co-immunoprecipitation). Through this interaction, Munc13-1 binds a subpopulation of the SNARE core complex (synaptobrevin/SNAP-25/syntaxin). The syntaxin-binding site overlaps with that of Munc18, suggesting competition for syntaxin binding.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — three independent biochemical methods in a single study demonstrating direct protein-protein interaction with mapped binding domains\",\n      \"pmids\": [\"8999968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Munc13-1 is a high-affinity presynaptic phorbol ester and diacylglycerol receptor with ligand affinities similar to protein kinase C. Phorbol ester binding causes Munc13-1 to associate with the plasma membrane, and overexpression of Munc13-1 presynaptically in the Xenopus neuromuscular junction enhances transmitter release in a phorbol ester-dependent manner.\",\n      \"method\": \"Radioligand binding assay, immunofluorescence membrane translocation, Xenopus NMJ electrophysiology overexpression\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct biochemical binding assays combined with functional in vivo overexpression at the NMJ, replicated across multiple experimental systems\",\n      \"pmids\": [\"9697857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Munc13-1 is essential for synaptic vesicle maturation (priming) to a fusion-competent state at glutamatergic synapses. Hippocampal neurons from Munc13-1 knockout mice form ultrastructurally normal synapses but cannot release transmitter in response to action potentials, Ca2+-ionophores, or hypertonic sucrose, while α-latrotoxin-evoked release is unaffected. GABAergic synapses are unaffected, demonstrating transmitter-specific priming mechanisms.\",\n      \"method\": \"Munc13-1 knockout mice, electrophysiology, electron microscopy\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with multiple orthogonal release-triggering stimuli, replicated across multiple synaptic contexts\",\n      \"pmids\": [\"10440375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Munc13-1 functionally interacts with the active zone protein RIM1 (a Rab3 effector). Disruption of the Munc13-1/RIM1 interaction causes loss of fusion-competent synaptic vesicles, phenocopying Munc13-1-deficient neurons. RIM1 binding and vesicle priming are mediated by two distinct structural modules of Munc13-1.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative disruption, electrophysiology in cultured neurons\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal protein interaction plus functional epistasis with defined domain mapping, multiple orthogonal methods\",\n      \"pmids\": [\"11343654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CAST (CAZ-associated structural protein) forms a ternary complex with RIM1 and Munc13-1 at the cytomatrix of the active zone. CAST binds RIM1 directly and Munc13-1 indirectly through RIM1, and Bassoon is also associated with this complex.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, immunolocalization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays in a single lab establishing ternary complex, but indirect Munc13-1 interaction via RIM1\",\n      \"pmids\": [\"12163476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The minimal priming domain of Munc13-1 resides in its C-terminal residues 1100–1735, which contains both Munc13 homology domains and the C-terminal C2 domain. Point mutations that abolish syntaxin-1 binding also abolish chromaffin granule priming activity, establishing that Munc13-1's interaction with syntaxin-1 is required for its priming function.\",\n      \"method\": \"Munc13-1 deletion constructs in electrophysiological gain-of-function assay (chromaffin cell capacitance), point mutagenesis\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution-style deletion mapping combined with point mutagenesis and functional electrophysiological readout in a single study\",\n      \"pmids\": [\"16271475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NMR structure of the Munc13-1 C1 domain reveals that a conserved tryptophan (Trp-588) occludes the DAG/phorbol ester binding site, requiring a conformational change for ligand binding. This structural feature distinguishes Munc13-1 from PKC C1 domains and is predicted to require higher DAG levels for activation.\",\n      \"method\": \"NMR spectroscopy (3D structure determination)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution NMR structure with detailed mechanistic interpretation; single lab but rigorous structural method\",\n      \"pmids\": [\"15667202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structures of the Munc13-1 C2A domain homodimer (1.44 Å) and the Munc13-1 C2A/RIM zinc-finger domain heterodimer (1.78 Å) reveal that homodimerization (via four-stranded concave face) and heterodimerization (via bottom tip and C-terminal helix) are mutually exclusive, suggesting a homodimer-to-heterodimer switch that may regulate vesicle priming and presynaptic plasticity.\",\n      \"method\": \"X-ray crystallography guided by NMR experiments\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structures of both complexes in a single study with NMR validation, demonstrating competitive binding mechanism\",\n      \"pmids\": [\"16732694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Active zone recruitment of Munc13-1 and ubMunc13-2 depends on their binding to RIM1α. A single point mutation (I121N) abolishes RIM1α binding in vitro and in cells; RIM1α-binding-deficient ubMunc13-2(I121N) is not recruited to synapses. Munc13-1 levels are reduced and improperly enriched at active zones in RIM1α-deficient brains.\",\n      \"method\": \"Mutagenesis, co-immunoprecipitation, immunofluorescence in cultured neurons and brain sections, RIM1α knockout mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — point mutagenesis combined with KO mice and multiple localization assays, functionally linking RIM1α binding to active zone recruitment\",\n      \"pmids\": [\"16704978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Activation of the Munc13-1 C1 domain by phorbol ester (PDBu) lowers the energy barrier for synaptic vesicle fusion without changing the size of the readily releasable pool. The C1 domain mutation H567K (PDBu-binding deficient) mimics the PDBu-activated state, acting as a constitutive gain-of-function that increases vesicular release rate. This defines a two-state regulatory model analogous to PKC.\",\n      \"method\": \"Knockin mice (Munc13-1-H567K), osmotic release, Ca2+-triggered and spontaneous release electrophysiology\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockin mouse model with multiple orthogonal electrophysiological assays, clean separation of pool size versus release rate\",\n      \"pmids\": [\"17267576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Munc13-1 is required for Gq-coupled receptor (histamine H1 receptor) potentiation of exocytosis via PLC/DAG signaling in chromaffin cells. The DAG-insensitive Munc13-1(H567K) completely abolished histamine-induced potentiation, while PKC inhibition had no effect, establishing that Munc13-1 is the downstream effector of PLC for rapid exocytotic potentiation.\",\n      \"method\": \"Adenoviral overexpression, capacitance measurements, pharmacological dissection\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative approach with pharmacological controls in a single lab identifying specific pathway dependence\",\n      \"pmids\": [\"17202488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Munc13-1 is expressed in pancreatic islet beta cells and is required for glucose-stimulated insulin secretion. Heterozygous Munc13-1 (+/-) knockout mice show reduced insulin secretion, impaired granule priming (reduced readily releasable pool and refilling), and abnormal glucose tolerance. The DAG-binding function of Munc13-1 contributes to phorbol ester-dependent potentiation of insulin secretion.\",\n      \"method\": \"Munc13-1 knockout and H567K knockin mice, intraperitoneal glucose tolerance test, patch-clamp capacitance measurements on beta cells\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic mouse models with multiple orthogonal assays (in vivo glucose tolerance, ex vivo patch-clamp) demonstrating functional requirement\",\n      \"pmids\": [\"16644700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Munc13-1 is required for the sustained (second phase) insulin release from pancreatic beta cells upon prolonged stimulation. Munc13-1 knockout eliminates the second phase of insulin secretion, and the DAG-binding-deficient H567K knockin also reduces it, demonstrating DAG-dependent priming of insulin-containing LDCVs.\",\n      \"method\": \"Munc13-1 knockout and H567K knockin mice, insulin secretion assay from primary beta cells\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two genetic mouse models (KO and KI) with functional secretion readouts, consistent results\",\n      \"pmids\": [\"16697276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Domains of five active zone proteins (Aczonin/Piccolo, Bassoon, CAST1/ELKS2, RIM1, and Munc13-1) converge on an interaction node centered on the N-terminal region of Munc13-1. The zinc-finger domain of RIM1, the C-terminal region of Bassoon, a segment of CAST1/ELKS2, and the CC3 domain of Aczonin/Piccolo all bind the Munc13-1 N-terminal region.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, recombinant domain binding assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple protein interactions mapped by yeast two-hybrid and pulldown in one study, but predominantly single-method for each pairwise interaction\",\n      \"pmids\": [\"19812333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The interaction between RIM1α and Munc13-1 is required for presynaptic long-term potentiation (LTP) at hippocampal mossy fiber synapses. Using acute in vivo expression of Munc13-1 variants in which the RIM-binding domain is selectively disrupted, Munc13-1 was shown to be an effector of RIM1α in presynaptic LTP, implicating modulation of vesicle priming as the cellular substrate for LTP expression.\",\n      \"method\": \"In vivo viral expression of Munc13-1 domain mutants, electrophysiology at hippocampal mossy fiber synapses\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific disruption with functional epistasis in vivo, but single lab\",\n      \"pmids\": [\"21849565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Munc13-1 is a major presynaptic target of Ca2+/calmodulin signaling that controls synaptic vesicle replenishment and short-term plasticity. Knockin mice expressing a Ca2+/calmodulin-insensitive Munc13-1(W464R) variant show slower SV replenishment, aberrant short-term depression, and reduced recovery from synaptic depression at the calyx of Held.\",\n      \"method\": \"Knockin mice (Munc13-1-W464R), electrophysiology at calyx of Held\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — precisely engineered knockin mouse with functional synaptic readout at a well-characterized synapse, establishing specific molecular mechanism\",\n      \"pmids\": [\"23770256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Munc13-1 translocates to the plasma membrane in a Doc2B- and calcium-dependent manner. When co-expressed with Doc2B, Munc13-1 co-translocates upon Ca2+ elevation but at a slower rate, and accumulates on the membrane after stimulation in a DAG-dependent manner (abrogated by H567K mutation). Doc2B thus enables a Ca2+- and DAG-dependent recruitment of Munc13-1 to the plasma membrane.\",\n      \"method\": \"Live-cell fluorescence imaging of GFP-tagged proteins in PC12 cells, Ca2+ stimulation\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — live imaging with functional mutagenesis (H567K) providing mechanistic insight, single lab\",\n      \"pmids\": [\"24062723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"β-adrenergic receptor activation translocates Munc13-1 from soluble to particulate (membrane) fractions via a cAMP/Epac/PLC/DAG pathway and enhances the Rab3A–RIM1α interaction, redistributing synaptic vesicles closer to the presynaptic membrane and increasing glutamate release at cerebrocortical terminals.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation, glutamate release assay from synaptosomes, electron microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods in single lab establishing pathway position and membrane translocation of Munc13-1\",\n      \"pmids\": [\"24036110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A de novo Pro814Leu variant in UNC13A (Munc13-1) causes a dominant gain-of-function characterized by increased synaptic vesicle fusion propensity, increased initial release probability, and abnormal short-term synaptic plasticity. This was demonstrated in murine neuronal cultures and in C. elegans expressing the variant.\",\n      \"method\": \"Electrophysiology in murine neuronal cultures, C. elegans functional assays, whole-exome sequencing\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — variant function validated in two independent biological systems (mouse neurons and C. elegans) with electrophysiological readouts\",\n      \"pmids\": [\"28192369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Munc13-1 forms discrete supramolecular self-assemblies in presynaptic terminals that serve as independent vesicular release sites by recruiting syntaxin-1. The multiplicity of these assemblies sets synaptic weight, with each assembly functioning as an independent release site.\",\n      \"method\": \"Single-synapse glutamate imaging, super-resolution (STORM/PALM) microscopy, correlative functional and structural analysis\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — super-resolution imaging combined with functional single-synapse measurements in a single study, establishing direct structure-function link\",\n      \"pmids\": [\"29230050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TNF-α impedes Fbxo45-dependent ubiquitination of Munc13-1 in the spinal dorsal horn, causing Munc13-1 accumulation at presynaptic sites. Neuropathic injury decreases Fbxo45 expression and Fbxo45–Munc13-1 co-precipitation, increasing mEPSC frequency. Spinal Munc13-1 knockdown attenuates allodynia, establishing Fbxo45 as the E3 ubiquitin ligase targeting Munc13-1 for degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, patch-clamp electrophysiology, behavioral testing in rats\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods in a single lab establishing Fbxo45 as the writer for Munc13-1 ubiquitination with functional consequences\",\n      \"pmids\": [\"30042425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Munc13-1 bridges the synaptic vesicle and plasma membranes through its elongated C1C2BMUNC2C region. Mutations in membrane-binding sites of the C2C domain disrupt liposome bridging, liposome fusion in vitro, and synaptic vesicle docking, priming, and Ca2+-triggered neurotransmitter release in mouse neurons, with a single residue substitution nearly abolishing release.\",\n      \"method\": \"Liposome bridging and fusion assays, mutagenesis, electrophysiology in mouse neurons, electron microscopy (vesicle docking)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis combined with neuronal electrophysiology and EM, multiple orthogonal methods establishing membrane bridging as central function\",\n      \"pmids\": [\"30816091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The MUN domain of Munc13-1 stabilizes the Munc18-1/syntaxin-1/VAMP2 template complex by ~2.1 kBT, as measured by single-molecule force spectroscopy. The MUN-bound template complex enhances SNAP-25 binding and promotes full SNARE assembly. Mutational studies confirm functional importance for SNARE assembly and neurotransmitter release.\",\n      \"method\": \"Single-molecule force spectroscopy, SNARE assembly assays, mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — novel single-molecule biophysical method with mutagenesis and functional SNARE assembly assays in a single study\",\n      \"pmids\": [\"31888993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RIM-BP2 promotes synaptic vesicle priming and release probability at hippocampal mossy fiber synapses via stabilization of Munc13-1 at the active zone. At CA3-CA1 synapses, RIM-BP2 loss only affects Ca2+-secretion coupling without affecting Munc13-1-dependent priming, demonstrating synapse type-specific RIM-BP2/Munc13-1 functional interactions.\",\n      \"method\": \"RIM-BP2 knockout mice, electrophysiology at two synapse types, immunostaining/quantification of Munc13-1 levels\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice with functional and localization analysis at two synapse types, single lab\",\n      \"pmids\": [\"31535974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NMR spectroscopy, SNARE complex assembly experiments, and liposome fusion assays demonstrate that Munc13-1 facilitates opening of syntaxin-1 via interactions with the syntaxin-1 linker region (very weak binding but functionally critical) rather than via the syntaxin-1 SNARE motif. Munc13-1 cannot be replaced by an artificial tethering factor for liposome fusion, indicating it has an active role beyond membrane bridging.\",\n      \"method\": \"NMR spectroscopy, SNARE complex assembly assays, liposome fusion reconstitution, mutagenesis\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical/biophysical methods in a single rigorous study with mutagenesis dissecting the syntaxin-opening mechanism\",\n      \"pmids\": [\"32086964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Munc13-1 must self-assemble into clusters on supported lipid bilayers to efficiently capture and retain synaptic vesicles. Purified Munc13-1 forms clusters of 2–20 copies, but only clusters of ≥6 copies efficiently capture vesicles. The C2C domain is not required for clustering but is required for efficient vesicle capture via electrostatic and hydrophobic interactions.\",\n      \"method\": \"Reconstitution on supported lipid bilayers, TIRF microscopy, stepwise photobleaching, domain deletion analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with quantitative single-molecule imaging and domain mapping, single lab\",\n      \"pmids\": [\"34227103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The C1-C2B region of Munc13-1 has two distinct membrane-binding faces. Mutations in the polybasic face (K603E, R769E) severely impair Ca2+-independent liposome bridging/fusion and synaptic vesicle priming. A K706E mutation in the C2B Ca2+-binding loops impairs Ca2+-evoked release. The polybasic face primarily controls vesicle priming while the DAG/Ca2+/PIP2-binding face modulates Ca2+-evoked release.\",\n      \"method\": \"In vitro liposome bridging/fusion reconstitution, point mutagenesis, electrophysiology in murine hippocampal cultures\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with structure-guided mutagenesis combined with neuronal electrophysiology, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"34779770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Munc13-1 regulates synaptic vesicle replenishment via Ca2+/phospholipid-dependent binding through its C2B domain. Knockin mice with mutations abolishing Ca2+/phospholipid binding show increased synaptic depression and slower SV pool recovery; mutations enhancing binding have opposite effects. This identifies Ca2+/phospholipid binding to Munc13-1 C2B as a core mechanism accelerating SV resupply.\",\n      \"method\": \"Knockin mice with C2B domain point mutations, electrophysiology at calyx of Held\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two complementary knockin mouse lines (loss- and gain-of-function) with functional electrophysiological readouts, consistent bidirectional phenotypes\",\n      \"pmids\": [\"34706220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TDP-43 represses a cryptic exon in UNC13A pre-mRNA. Loss of TDP-43 from the nucleus in human brain, neuronal cell lines, and iPSC-derived motor neurons results in inclusion of a cryptic exon in UNC13A mRNA and reduced UNC13A protein expression. Risk SNPs for FTD/ALS located within the intron containing the cryptic exon increase cryptic exon inclusion in the context of TDP-43 dysfunction.\",\n      \"method\": \"TDP-43 knockdown in human neuronal cell lines and iPSC-derived motor neurons, RT-PCR, Western blot, RNA-seq, postmortem human brain analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple human cellular systems and postmortem brain, replicated independently by two concurrent groups, mechanistically linking TDP-43 loss to UNC13A protein depletion\",\n      \"pmids\": [\"35197626\", \"35197628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TDP-43 depletion induces robust cryptic exon inclusion in UNC13A, resulting in nonsense-mediated decay and loss of UNC13A protein. Two common intronic UNC13A polymorphisms (rs12608932 and rs12973192) associated with ALS/FTD risk overlap with TDP-43 binding sites and potentiate cryptic exon inclusion both in cultured cells and in patient brain/spinal cord.\",\n      \"method\": \"TDP-43 knockdown, RT-PCR, minigene splicing assays, postmortem ALS/FTD patient brain and spinal cord analysis, cell-based NMD assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic link between specific SNPs and TDP-43 binding sites established by minigene assays, confirmed in patient tissue, independent replication concurrent with PMID 35197626\",\n      \"pmids\": [\"35197628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Paramagnetic NMR (pseudocontact shifts and residual dipolar couplings) of the Calmodulin/Munc13-1 complex reveals highly flexible interdomain motion. A genetic algorithm ensemble approach characterized the conformational space of the CaM/Munc13-1 complex without prior crystallographic knowledge.\",\n      \"method\": \"Paramagnetic NMR spectroscopy (pseudocontact shifts, residual dipolar couplings), molecular mechanics ensemble calculation\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous NMR structural approach but single lab with no functional validation of structural model\",\n      \"pmids\": [\"36082939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TDP-43's extreme N-terminus is important for repression of UNC13A cryptic exon inclusion. Additionally, hnRNP L, hnRNP A1, and hnRNP A2B1 bind UNC13A RNA and repress cryptic exon inclusion independently of TDP-43. Higher hnRNP L protein levels associate with lower burden of UNC13A cryptic RNA in ALS/FTD brains.\",\n      \"method\": \"TDP-43 domain-deletion constructs, RNA immunoprecipitation, minigene splicing assays, patient brain correlative analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping and RIP assays combined with patient brain data, single lab\",\n      \"pmids\": [\"36930682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The N-terminal C2A and CaM-binding (CaMb) domains of Munc13-1 interact with its own MUN domain (intramolecular autoinhibition), suppressing SNARE complex assembly and liposome fusion activity. These inhibitory interactions are relieved by RIM2α zinc-finger domain (relieving C2A-MUN interaction) and calmodulin (relieving CaMb-MUN interaction), providing a mechanism for dual regulation of Munc13-1 activity.\",\n      \"method\": \"Purification of full-length Munc13-1 fragment, liposome fusion assays, NMR spectroscopy\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — first purification of near-full-length Munc13-1, in vitro reconstitution with mutagenesis and NMR, multiple orthogonal methods establishing autoinhibitory mechanism\",\n      \"pmids\": [\"38417672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TDP-43 loss of function induces severe reduction in synaptic transmission and asynchronous network activity. These deficits are largely driven by a cryptic exon in UNC13A. Antisense oligonucleotides (ASOs) targeting the UNC13A cryptic exon robustly rescue UNC13A protein levels and restore normal synaptic function.\",\n      \"method\": \"TDP-43 depletion in neuronal cultures, multi-electrode array recordings, ASO treatment, Western blot\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue experiment with ASO demonstrating causal role of UNC13A cryptic exon in synaptic dysfunction, preprint status reduces confidence\",\n      \"pmids\": [\"38979232\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Differential SNARE chaperoning by Munc13-1 and Munc18-1 regulates fusion pore fate. Munc13-1 clusters multiple SNARE complexes at the release site and synchronizes release events, while Munc18-1 stoichiometrically interacts with trans-SNARE complexes to enhance N-to-C-terminal zippering. Together, both proteins differentially access dynamic trans-SNARE complexes to regulate pore properties.\",\n      \"method\": \"Single-molecule fusion pore assay, SNARE reconstitution, fluorescence imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule reconstitution with functional pore measurement, multiple orthogonal observations in a single study\",\n      \"pmids\": [\"38755165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A negatively charged polyE sequence in the N-terminus of Munc13-1 binds the MUN domain via charge-charge interactions, inhibiting MUN-mediated SNARE complex assembly. Ca2+ ions (~40 μM, comparable to local presynaptic Ca2+ from a single action potential) compete with the polyE-MUN interaction to relieve autoinhibition and enhance neurotransmitter release. Pseudophosphorylated mutations in the MUN domain that disrupt polyE binding enhance release.\",\n      \"method\": \"In vitro binding assays, SNARE assembly assays, mutagenesis (pseudophosphorylation), electrophysiology in neurons\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution of autoinhibitory mechanism combined with neuronal electrophysiology and specific mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"40489622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Pathogenic germline coding or splice-site UNC13A variants cause a neurodevelopmental syndrome through three distinct mechanisms: (1) reduced UNC13A protein expression causing loss of synaptic strength, (2) gain-of-function UNC13A variants causing increased neurotransmission, and (3) impaired regulation of neurotransmission by second messenger signaling. These mechanisms were validated in mouse hippocampal neurons and C. elegans.\",\n      \"method\": \"Variant expression in mouse hippocampal neurons, C. elegans functional assays, electrophysiology, genotype-phenotype correlation\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple pathogenic variants characterized in two independent biological systems with electrophysiological readouts, strong genotype-phenotype-functional correlation\",\n      \"pmids\": [\"41125872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ALS-associated RNA-binding proteins MATR3, FUS, and hnRNPA1 promote UNC13A transcription by binding to and downregulating REST mRNA, thereby relieving REST-mediated transcriptional repression of UNC13A. Loss of these RBPs in cultured cells or ALS patient motor neurons leads to REST overexpression and reduced UNC13A levels.\",\n      \"method\": \"siRNA knockdown, RT-PCR, Western blot, RNA immunoprecipitation, iPSC-derived motor neurons from ALS patients\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple RBP knockdowns with consistent REST-UNC13A pathway effects, validated in patient-derived neurons, single lab\",\n      \"pmids\": [\"40707625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Unc13A's calmodulin-binding (CaM) domain mutation in Drosophila increases baseline transmission while blocking both short-term facilitation and presynaptic homeostatic potentiation. Mathematical modeling suggests Ca2+/calmodulin/Unc13A interaction plastically stabilizes vesicle priming at release sites, and CaM-domain mutation causes constitutive stabilization, occluding activity-dependent plasticity. STED microscopy shows CaM-domain mutation shifts Unc13A MUN domain closer to release sites.\",\n      \"method\": \"Drosophila NMJ electrophysiology, STED super-resolution microscopy, mathematical modeling, mutagenesis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional mutagenesis combined with super-resolution microscopy and electrophysiology in Drosophila, supported by mathematical modeling\",\n      \"pmids\": [\"37243591\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UNC13A/Munc13-1 is a large multidomain presynaptic active zone protein that functions as an essential synaptic vesicle priming factor by: (1) opening syntaxin-1 from its closed autoinhibited state via weak interactions with the syntaxin-1 linker region; (2) bridging synaptic vesicle and plasma membranes through opposite ends of its elongated C1C2BMUNC2C structure, with the C2C domain contacting the vesicle membrane; (3) chaperoning SNARE complex assembly by stabilizing the Munc18-1/syntaxin-1/VAMP2 template complex through its MUN domain; (4) serving as a convergence point for multiple regulatory signals—diacylglycerol/phorbol ester via its C1 domain lowers the energy barrier for fusion, Ca2+/calmodulin via the CaMb domain and Ca2+/phospholipid via the C2B domain accelerate SV replenishment and control short-term plasticity, and the C2A domain homodimer/RIM heterodimer switch links priming to presynaptic long-term plasticity; (5) forming supramolecular self-assemblies at active zones that define the number of independent release sites and thereby set synaptic weight; and (6) being recruited to active zones by RIM1α binding. In disease contexts, nuclear loss of TDP-43 de-represses a cryptic exon in UNC13A pre-mRNA, causing nonsense-mediated decay and UNC13A protein depletion, which is potentiated by ALS/FTD-risk SNPs overlapping TDP-43 binding sites in the cryptic exon-containing intron, directly linking TDP-43 proteinopathy to impaired synaptic transmission.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"UNC13A/Munc13-1 is an essential presynaptic active zone protein that primes synaptic vesicles to a fusion-competent state, a function required for evoked neurotransmitter release at glutamatergic synapses [#2]. It executes priming by directly engaging the SNARE machinery: it binds syntaxin-1 and facilitates its opening from the autoinhibited state through weak but functionally critical contacts with the syntaxin-1 linker, an active role that cannot be substituted by a passive tethering factor [#0, #24]. Its elongated C1C2BMUNC2C module physically bridges the synaptic vesicle and plasma membranes—with the C2C domain contacting the vesicle membrane and a polybasic C1-C2B face controlling priming—so that point mutations in these surfaces disrupt liposome bridging, vesicle docking, and Ca2+-triggered release [#21, #26]. The MUN domain chaperones SNARE assembly by stabilizing the Munc18-1/syntaxin-1/VAMP2 template complex and clustering SNARE complexes to synchronize release [#22, #34]. Munc13-1 is a convergence point for multiple regulatory inputs: diacylglycerol/phorbol ester acting through its C1 domain lowers the energy barrier for fusion and mediates Gq/PLC-coupled potentiation [#9, #10], while Ca2+/calmodulin and Ca2+/phospholipid binding through the CaM-binding and C2B domains accelerate vesicle replenishment and control short-term plasticity [#15, #27]. Its activity is held in check by intramolecular autoinhibition, in which the N-terminal C2A, CaM-binding, and acidic polyE segments engage the MUN domain to suppress SNARE assembly; this is relieved by RIM zinc-finger binding, calmodulin, and Ca2+ [#32, #35]. Munc13-1 is recruited to and stabilized at the active zone through RIM1\\u03b1 binding and forms supramolecular self-assemblies that define independent release sites and thereby set synaptic weight [#8, #19]. Beyond neurons, Munc13-1 primes insulin granules and is required for glucose-stimulated insulin secretion [#11, #12]. Germline coding and splice-site UNC13A variants cause a neurodevelopmental syndrome through reduced expression, gain-of-function increases in neurotransmission, or impaired second-messenger regulation [#18, #36], and nuclear loss of TDP-43 de-represses a cryptic exon in UNC13A pre-mRNA that triggers nonsense-mediated decay and protein depletion, mechanistically linking TDP-43 proteinopathy in ALS/FTD to synaptic failure [#28, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established the first molecular link between Munc13-1 and the fusion machinery by showing it physically engages syntaxin-1 and the SNARE core complex, raising the question of how it intersects Munc18 function.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, and co-immunoprecipitation mapping the C-terminal syntaxin-binding site\",\n      \"pmids\": [\"8999968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of syntaxin binding not yet shown\", \"Mechanism of competition with Munc18 not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined Munc13-1 as a high-affinity DAG/phorbol ester receptor whose membrane translocation enhances release, identifying it as a presynaptic second-messenger effector.\",\n      \"evidence\": \"Radioligand binding, membrane translocation imaging, and Xenopus NMJ overexpression electrophysiology\",\n      \"pmids\": [\"9697857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous role versus overexpression artifact not yet distinguished\", \"Structural basis of the C1-membrane interaction unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated that Munc13-1 is essential and acts specifically at the vesicle priming step, since knockout neurons form normal synapses but cannot release transmitter.\",\n      \"evidence\": \"Munc13-1 knockout mice with electrophysiology across multiple release stimuli and electron microscopy\",\n      \"pmids\": [\"10440375\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transmitter-specific (glutamate vs GABA) basis not explained molecularly\", \"Biochemical mechanism of priming not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed Munc13-1 in the active zone protein network by showing its RIM1 interaction is required for generating fusion-competent vesicles, separating priming from RIM binding into distinct modules.\",\n      \"evidence\": \"Co-immunoprecipitation, dominant-negative disruption, and electrophysiology in cultured neurons\",\n      \"pmids\": [\"11343654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RIM binding controls localization vs activity unresolved at this stage\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Expanded the active zone scaffold to a ternary CAST/RIM1/Munc13-1 complex, integrating Munc13-1 into the cytomatrix.\",\n      \"evidence\": \"Co-immunoprecipitation, yeast two-hybrid, and immunolocalization\",\n      \"pmids\": [\"12163476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Munc13-1 interaction is indirect via RIM1\", \"Functional role of CAST for Munc13-1 not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localized the minimal priming activity to the C-terminal C1C2BMUNC2C region and proved that syntaxin binding is required for priming function.\",\n      \"evidence\": \"Deletion constructs and point mutagenesis in a chromaffin cell capacitance gain-of-function assay; NMR structure of the C1 domain\",\n      \"pmids\": [\"16271475\", \"15667202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the C1 Trp-588 occlusion is relieved in vivo unknown\", \"Full-length structure not available\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved a C2A homodimer-to-RIM-heterodimer switch and established that RIM1\\u03b1 binding recruits Munc13-1 to the active zone, connecting localization to plasticity.\",\n      \"evidence\": \"Crystal structures of C2A homo- and heterodimers; point mutagenesis (I121N) plus RIM1\\u03b1 knockout mice and localization assays\",\n      \"pmids\": [\"16732694\", \"16704978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo trigger of the dimer switch not demonstrated\", \"Quantitative contribution of recruitment vs activation unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Generalized Munc13-1 priming function beyond neurons by showing it is required for glucose-stimulated and sustained-phase insulin secretion in pancreatic beta cells.\",\n      \"evidence\": \"Munc13-1 knockout and H567K knockin mice, glucose tolerance tests, beta-cell patch-clamp and secretion assays\",\n      \"pmids\": [\"16644700\", \"16697276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same SNARE-priming mechanism operates on LDCVs as on SVs not directly compared\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a two-state DAG/C1 regulatory model in which C1 activation lowers the fusion energy barrier without altering pool size, and identified Munc13-1 as the PLC effector for receptor-driven potentiation.\",\n      \"evidence\": \"Munc13-1-H567K knockin mice with multiple electrophysiological assays; chromaffin cell pharmacological dissection of Gq/PLC signaling\",\n      \"pmids\": [\"17267576\", \"17202488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the C1 conformational switch in situ not shown\", \"Chromaffin pathway study is dominant-negative based\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapped a convergence node on the Munc13-1 N-terminus where multiple active zone scaffold proteins bind, framing Munc13-1 as an organizing hub.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, and recombinant domain binding assays\",\n      \"pmids\": [\"19812333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most pairwise interactions are single-method\", \"Functional hierarchy of these interactions untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified Ca2+/calmodulin acting through the CaM-binding domain as the molecular controller of vesicle replenishment and short-term plasticity, and characterized Doc2B/Ca2+-dependent and \\u03b2-adrenergic/cAMP-Epac-PLC recruitment of Munc13-1 to membranes.\",\n      \"evidence\": \"Munc13-1-W464R knockin mice at calyx of Held; live-cell imaging in PC12 cells; synaptosome fractionation, co-IP, glutamate release and EM\",\n      \"pmids\": [\"23770256\", \"24062723\", \"24036110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Doc2B and \\u03b2-adrenergic findings are single-lab\", \"Integration of multiple signaling inputs at one molecule not quantitatively modeled\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked RIM1\\u03b1-Munc13-1 binding to presynaptic long-term potentiation, identifying vesicle-priming modulation as a cellular substrate for LTP.\",\n      \"evidence\": \"In vivo viral expression of RIM-binding-deficient Munc13-1 mutants with mossy fiber electrophysiology\",\n      \"pmids\": [\"21849565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Molecular event downstream of RIM binding during LTP not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected Munc13-1 dysfunction to human disease by showing a de novo P814L gain-of-function variant increases fusion propensity and disrupts plasticity, and resolved Munc13-1 self-assemblies as independent release sites that set synaptic weight.\",\n      \"evidence\": \"Variant electrophysiology in mouse neurons and C. elegans; super-resolution imaging with single-synapse glutamate measurements\",\n      \"pmids\": [\"28192369\", \"29230050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the supramolecular assembly not structurally defined\", \"Link between assembly number and release-site count mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided a unified membrane-bridging and SNARE-chaperoning mechanism, showing the C2C domain bridges vesicle and plasma membranes while the MUN domain stabilizes the Munc18-1 template complex to drive SNARE assembly.\",\n      \"evidence\": \"Liposome bridging/fusion reconstitution, single-molecule force spectroscopy, mutagenesis, neuronal electrophysiology and EM; RIM-BP2 knockout mice\",\n      \"pmids\": [\"30816091\", \"31888993\", \"31535974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How bridging and chaperoning are temporally coordinated unresolved\", \"Synapse-type specificity of RIM-BP2 effect not mechanistically explained\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that Munc13-1 actively opens syntaxin-1 via weak linker-region binding rather than the SNARE motif, establishing a catalytic role beyond passive tethering.\",\n      \"evidence\": \"NMR, SNARE assembly assays, and liposome fusion reconstitution with mutagenesis\",\n      \"pmids\": [\"32086964\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural snapshot of the open-syntaxin intermediate lacking\", \"Kinetics of opening in the full active zone context unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Dissected Munc13-1 membrane-binding surfaces and clustering requirements, separating the polybasic priming face from the DAG/Ca2+/PIP2 release-modulating face and showing \\u22656-copy clusters are needed for vesicle capture.\",\n      \"evidence\": \"Supported-lipid-bilayer reconstitution with TIRF and photobleaching; point mutagenesis with liposome assays and neuronal electrophysiology; C2B Ca2+/phospholipid knockin mice at calyx of Held\",\n      \"pmids\": [\"34227103\", \"34779770\", \"34706220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger of clustering in vivo not established\", \"How distinct membrane faces are coordinated during a release cycle unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed the disease-driving regulatory axis: nuclear TDP-43 loss de-represses a UNC13A cryptic exon causing NMD and protein depletion, potentiated by ALS/FTD-risk SNPs overlapping TDP-43 binding sites.\",\n      \"evidence\": \"TDP-43 knockdown in human neuronal lines and iPSC motor neurons, RT-PCR, minigene splicing, RNA-seq, NMD assays, and postmortem ALS/FTD tissue; replicated by two concurrent studies\",\n      \"pmids\": [\"35197626\", \"35197628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of UNC13A loss to ALS/FTD pathophysiology not yet established\", \"Whether partial protein loss alone causes neurodegeneration unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Broadened the splicing-control network and refined the calmodulin-priming model, identifying TDP-43's N-terminus and hnRNP L/A1/A2B1 as cryptic-exon repressors and showing CaM-domain control of vesicle stabilization and homeostatic plasticity.\",\n      \"evidence\": \"TDP-43 domain-deletion and RIP assays with patient brain correlation; Drosophila NMJ electrophysiology, STED microscopy, and mathematical modeling of CaM-domain mutants\",\n      \"pmids\": [\"36930682\", \"37243591\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"hnRNP findings are single-lab\", \"How multiple RBPs cooperate on the cryptic exon not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established intramolecular autoinhibition as a core regulatory principle, showing N-terminal C2A/CaMb/polyE segments suppress MUN-driven SNARE assembly until relieved by RIM, calmodulin, or local Ca2+, and resolved how Munc13-1 vs Munc18-1 differentially chaperone SNAREs to control fusion pores; ASO rescue confirmed cryptic-exon causality.\",\n      \"evidence\": \"Near-full-length Munc13-1 purification with liposome fusion and NMR; biochemical/electrophysiological dissection of polyE-MUN-Ca2+ competition; single-molecule fusion-pore assays; ASO rescue of TDP-43-depleted neurons on multi-electrode arrays (preprint)\",\n      \"pmids\": [\"38417672\", \"38755165\", \"40489622\", \"38979232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How autoinhibitory inputs are integrated quantitatively in vivo unresolved\", \"ASO rescue is preprint and not yet in vivo\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Consolidated UNC13A as a Mendelian neurodevelopmental disease gene with three distinct variant mechanisms and identified an upstream transcriptional control axis through ALS-RBP-mediated REST regulation.\",\n      \"evidence\": \"Variant expression in mouse hippocampal neurons and C. elegans with genotype-phenotype correlation; RBP knockdowns, RIP, and patient iPSC motor neurons linking MATR3/FUS/hnRNPA1-REST to UNC13A transcription\",\n      \"pmids\": [\"41125872\", \"40707625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"REST-axis study is single-lab\", \"Relative contribution of transcriptional vs splicing regulation to disease in patients not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple, overlapping regulatory inputs (DAG/C1, Ca2+/calmodulin, Ca2+/phospholipid, RIM, polyE autoinhibition, clustering) are integrated in real time at a single active zone to set release probability and plasticity remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No integrated structural model of full-length Munc13-1 in the active zone\", \"Temporal coordination of autoinhibition relief with Ca2+ influx during an action potential not directly observed\", \"Therapeutic correction of UNC13A loss not validated in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [22, 24, 32, 34]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 21, 26]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 19, 21, 22]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 15, 27, 32]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [9, 15, 27, 35]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 16, 17, 19, 21]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [16, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 9, 15, 19, 27]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [3, 8, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [18, 28, 29, 36]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 17]}\n    ],\n    \"complexes\": [\n      \"active zone cytomatrix (CAST/RIM1/Munc13-1/Bassoon)\",\n      \"Munc18-1/syntaxin-1/VAMP2 template complex\",\n      \"Munc13-1 supramolecular release-site assembly\"\n    ],\n    \"partners\": [\n      \"STX1A\",\n      \"RIMS1\",\n      \"UNC18-1/STXBP1\",\n      \"VAMP2\",\n      \"CALM1\",\n      \"DOC2B\",\n      \"ERC1/CAST\",\n      \"RIMBP2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}