{"gene":"PRRT2","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2011,"finding":"Truncating mutations in PRRT2 alter the subcellular localization of the PRRT2 protein, as demonstrated by direct experiment in cells expressing mutant versus wild-type PRRT2.","method":"Subcellular localization assay in cells expressing truncating mutants vs wild-type PRRT2","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single localization experiment, single lab, limited methodological detail in abstract","pmids":["22101681"],"is_preprint":false},{"year":2011,"finding":"PRRT2 localizes to axons but not to dendritic processes in primary neuronal culture; truncating mutations associated with PKD/IC lead to dramatically reduced PRRT2 protein levels in neurons. PRRT2 was reported to interact with the t-SNARE SNAP25.","method":"Primary neuronal culture immunostaining; Western blotting of mutant vs wild-type expressing neurons; co-immunoprecipitation with SNAP25","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — axonal localization by immunostaining, SNAP25 interaction by Co-IP, reduced protein by Western blot; single lab but multiple orthogonal methods","pmids":["22832103"],"is_preprint":false},{"year":2016,"finding":"PRRT2 is enriched in presynaptic terminals; its silencing decreases synapse number and increases docked synaptic vesicles at rest. PRRT2-silenced neurons show severe impairment of synchronous neurotransmitter release, decreased release probability and Ca2+ sensitivity, and increased asynchronous/synchronous release ratio. PRRT2 directly interacts with SNAP-25 and synaptotagmin 1/2.","method":"shRNA silencing in primary neurons; electrophysiology (patch-clamp); electron microscopy; co-immunoprecipitation of PRRT2 with SNAP-25 and Syt1/2","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, defined synaptic phenotype with electrophysiology and EM, multiple orthogonal methods in single rigorous study","pmids":["27052163"],"is_preprint":false},{"year":2016,"finding":"PRRT2 adopts a type II transmembrane topology in which only the second hydrophobic segment spans the plasma membrane, the first hydrophobic segment forms an intracellular helix-loop-helix without crossing the membrane, and the large proline-rich N-terminal domain is intracellular (N_cyt/C_exo). PRRT2 interacts with Intersectin 1, an intracellular protein involved in synaptic vesicle cycling.","method":"Live immunolabeling, immunogold electron microscopy, surface biotinylation, computational modeling, co-immunoprecipitation with Intersectin 1","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal structural/biochemical methods (immunogold EM, biotinylation, live labeling, computational modeling) in single study with functional validation","pmids":["26797119"],"is_preprint":false},{"year":2017,"finding":"PRRT2 is a presynaptic protein that interacts with components of the SNARE complex and downregulates its formation. Loss-of-function in cerebellar granule cells causes PKD-like phenotypes; PRRT2 KO mice with granule cell-specific deletion recapitulate behavioral phenotypes, and cerebellar slice recordings show optogenetic stimulation of granule cells causes transient elevation followed by suppression of Purkinje cell firing.","method":"Co-immunoprecipitation with SNARE complex proteins; conditional KO mouse (cerebellar granule cell-specific); behavioral phenotyping; optogenetic stimulation with extracellular recording in cerebellar slices","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in conditional KO, Co-IP, circuit-level electrophysiology, behavioral readout; multiple orthogonal methods","pmids":["29056747"],"is_preprint":false},{"year":2018,"finding":"PRRT2 directly interacts with Nav1.2 and Nav1.6 (but not Nav1.1) channels, decreases their membrane surface exposure and Na+ current amplitude, induces a negative shift in voltage-dependence of inactivation, and slows recovery from inactivation. Loss of PRRT2 leads to increased Na+ currents and axon initial segment elongation in iPSC-derived neurons from homozygous patients and PRRT2 KO mice.","method":"HEK-293 cells stably expressing Nav subtypes; patch-clamp electrophysiology; surface biotinylation; co-immunoprecipitation in brain tissue; iPSC-derived neurons; multi-electrode array; PRRT2 KO mouse primary neurons","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted interaction in HEK cells with biophysical measurements, validated in human iPSC neurons and mouse KO neurons, Co-IP in native brain tissue, multiple orthogonal methods","pmids":["29554219"],"is_preprint":false},{"year":2018,"finding":"PRRT2 selectively blocks trans-SNARE complex assembly and negatively regulates synaptic vesicle priming, mediated by weak interactions of the N-terminal proline-rich domain with synaptic SNARE proteins. Disease-associated PRRT2 mutations disrupt this SNARE-modulatory function with efficiencies corresponding to phenotypic severity.","method":"Reconstituted single-vesicle and bulk fusion assays; live cell imaging of single exocytotic events in PC12 cells; biophysical analysis; mutagenesis of PRRT2 disease variants","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution assays, single-vesicle fusion, live cell imaging, mutagenesis with disease variant correlation","pmids":["29346777"],"is_preprint":false},{"year":2015,"finding":"Mutant PRRT2 (PKC-associated mutations) interferes with SNAP25 and GRIA1 (GluA1, AMPA receptor subunit) interactions; co-transfection with mutant PRRT2 increases GRIA1 surface distribution. Higher glutamate levels were observed in plasma of PKC patients and culture medium of Prrt2-knockdown neurons.","method":"Co-immunoprecipitation (PRRT2 with SNAP25 and GRIA1); live-labeling of surface GRIA1; double immunostaining; PRRT2 knockdown in neurons","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and live surface labeling in single lab; multiple readouts but no independent replication","pmids":["25915028"],"is_preprint":false},{"year":2014,"finding":"Truncating PRRT2 mutations lead to nonsense-mediated mRNA decay (NMD), reducing PRRT2 mRNA and protein levels; inhibition of NMD rescues truncated PRRT2 mRNA. The small fraction of undegraded truncated protein mislocalizes from membrane to cytoplasm and nucleus.","method":"NMD inhibitors (emetine, cycloheximide) in lymphoblasts; UPF1 siRNA silencing; Western blot; subcellular localization of mutant PRRT2 in SH-SY5Y cells","journal":"Parkinsonism & related disorders","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional NMD rescue experiment with pharmacological and genetic inhibitors, combined with localization assay; single lab","pmids":["25457817"],"is_preprint":false},{"year":2016,"finding":"PRRT2 is expressed both pre- and post-synaptically; knockdown of Prrt2 in vivo (by in utero electroporation of shRNA) delays neuronal migration during embryonic development and markedly decreases synaptic density after birth. Truncating mutants accumulate in the cytoplasm and fail to reach the cell membrane.","method":"Synaptic membrane fractionation; immunostaining; in utero electroporation of shRNA in cortical neurons; confocal microscopy of subcellular localization","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KD with defined migration phenotype and synaptic density readout, combined with localization assay; single lab","pmids":["27172900"],"is_preprint":false},{"year":2016,"finding":"PRRT2 KO mice display paroxysmal movements at locomotion onset, abnormal motor behaviors, increased sensitivity to convulsants. Cerebellar patch-clamp shows higher excitatory strength at parallel fiber-Purkinje cell synapses during high-frequency stimulation. β-galactosidase reporter mapping reveals highest PRRT2 expression in cerebellum, hindbrain and spinal cord.","method":"Constitutive PRRT2 KO mouse; β-galactosidase reporter staining; patch-clamp electrophysiology in hippocampal and cerebellar slices; behavioral testing; pentylenetetrazol sensitivity","journal":"Neurobiology of disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive KO with defined cerebellar electrophysiology phenotype and behavioral readout; replicated in independent lab","pmids":["28007585"],"is_preprint":false},{"year":2019,"finding":"Constitutive PRRT2 KO in hippocampal neurons decreases excitatory synapse number without affecting inhibitory synapses. Excitatory KO neurons show slowed exocytosis kinetics, weakened spontaneous and evoked synaptic transmission, and markedly increased facilitation. Inhibitory neurons show strengthened basal transmission and faster depression. At the network level, these effects result in heightened spontaneous and evoked activity and increased excitability of excitatory neurons.","method":"PRRT2 KO primary hippocampal neurons; live imaging (vesicle fusion); patch-clamp electrophysiology; multi-electrode array; acute hippocampal slices","journal":"Cerebral cortex","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO with defined electrophysiological phenotypes across multiple synapse types and network level; multiple orthogonal methods","pmids":["29912316"],"is_preprint":false},{"year":2019,"finding":"PRRT2 frameshift mutation (c.649_650InsC) reduces PRRT2 mRNA stability (shortened half-life), leading to loss of function. Knock-in mice expressing this mutation phenocopy KO mice (same rotarod/balance beam impairment, seizure sensitivity, altered SNARE complex, synaptic vesicle number changes). Truncated PRRT2 protein was undetectable in KI brain tissue.","method":"Prrt2 knock-in (KI) and KO mouse comparison; mRNA half-life measurement; behavioral testing; Western blot; SNARE complex assay; electron microscopy of synaptic vesicles","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — KI vs KO genetic comparison with identical phenotype, mRNA stability assay, multiple molecular and behavioral readouts","pmids":["31785815"],"is_preprint":false},{"year":2019,"finding":"PRRT2 missense variants clustering near the C-terminus frequently impair protein targeting to the plasma membrane; 8 of 13 missense variants tested showed decreased membrane localization, while benign variants showed normal membrane localization similar to wild-type.","method":"Confocal microscopy of mutant PRRT2 subcellular localization; cell surface biotinylation assay in transfected cells","journal":"Epilepsia","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — systematic surface biotinylation and imaging of 13 missense variants; single lab, two orthogonal methods","pmids":["30980674"],"is_preprint":false},{"year":2018,"finding":"PRRT2 directly interacts with STX1B (syntaxin 1B), a SNARE protein critical for neurotransmitter release; a truncating variant (p.Ser208Ilefs*17) lacking the helix-loop-helix domain fails to bind STX1B. The variant also abolishes normal membrane localization of PRRT2.","method":"Co-immunoprecipitation of PRRT2 with STX1B; Western blot; immunofluorescence subcellular localization in HeLa and N2A cells; whole exome sequencing with family segregation","journal":"Epilepsia","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and localization assay in single lab; domain-deletion mutant identifies helix-loop-helix as required for STX1B binding","pmids":["30009426"],"is_preprint":false},{"year":2018,"finding":"PRRT2 negatively regulates SNARE complex assembly through interaction with SNAP25, STX1A, and VAMP2 in the M1 motor cortex. In PRRT2 truncated mutant rats, release of amino acid neurotransmitters is increased, GRIA1 protein levels are significantly increased, GABRA1 levels are reduced, mEPSC frequency and amplitude are increased, mIPSC amplitude is decreased, and the E/I balance is disrupted.","method":"PRRT2 truncated mutant rat model; Co-immunoprecipitation of SNARE proteins; neurotransmitter HPLC measurement; Western blot; patch-clamp (mEPSC/mIPSC)","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rat model with Co-IP, electrophysiology, and biochemistry; single lab, multiple orthogonal methods","pmids":["30347267"],"is_preprint":false},{"year":2020,"finding":"PRRT2 silencing in non-neuronal cell lines inhibits cell motility, increases cell aggregation, promotes filopodia protrusion, and alters focal adhesion turnover — all processes involving actin cytoskeleton. In hippocampal neurons, PRRT2 silencing reduces synaptic filamentous actin, perturbs actin dynamics, and decreases dendritic spine density and maturation. Cofilin is identified as the effector: PRRT2 silencing unbalances cofilin activity, causing cofilin-actin rod formation; expression of phospho-mimetic cofilin (S3E) rescues spine defects but not neurotransmitter release alterations.","method":"shRNA silencing in non-neuronal cells and hippocampal neurons; live imaging of actin dynamics; phalloidin staining; dendritic spine morphometry; cofilin phospho-mimetic rescue experiment","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — silencing with defined cytoskeletal readouts, genetic rescue with cofilin mutant, single lab with multiple orthogonal methods","pmids":["33056987"],"is_preprint":false},{"year":2021,"finding":"PRRT2 directly interacts with α1 and α3 Na+/K+ ATPase (NKA) pumps in mouse brain. PRRT2 deficiency impairs NKA function during neuronal stimulation (without affecting expression or surface exposure), increases clustering of α3-NKA on plasma membrane, and reduces the NKA-dependent afterhyperpolarization following high-frequency firing. Re-expression of PRRT2 rescues all these phenotypes.","method":"Pulldown-based proteomics of mouse brain; co-immunoprecipitation; immunofluorescence colocalization; electrophysiology (afterhyperpolarization recording); PRRT2 re-expression rescue","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomics-identified interaction confirmed by Co-IP and colocalization, functional electrophysiological phenotype rescued by PRRT2 re-expression; multiple orthogonal methods","pmids":["33731672"],"is_preprint":false},{"year":2021,"finding":"PRRT2 directly interacts with P/Q-type (Cav2.1) Ca2+ channels via Co-IP, pull-down, and proteomics. PRRT2 deletion reduces P/Q-type channel membrane targeting (without changing total expression), decreases P/Q-type Ca2+ channel clustering at the presynaptic active zone, and reduces P/Q-dependent presynaptic Ca2+ signal and EPSC amplitude.","method":"Co-immunoprecipitation; pull-down assays; proteomics; surface biotinylation; electrophysiology (evoked EPSCs, somatic Ca2+ currents); two-photon imaging of presynaptic Ca2+ signals; PRRT2 acute and constitutive deletion","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct interaction confirmed by three independent biochemical methods, functional Ca2+ and electrophysiology phenotypes in both acute and constitutive KO","pmids":["34133925"],"is_preprint":false},{"year":2021,"finding":"PRRT2 KO cerebellar granule cells display increased Na+ channel expression, increased Na+ current amplitude, and increased axon initial segment length, leading to enhanced intrinsic excitability and greater action potential discharge in response to mossy fiber activation, without changes at mossy fiber-GC synapses.","method":"PRRT2 KO primary cerebellar granule cells; patch-clamp electrophysiology (transient and persistent Na+ currents, AIS measurement); acute cerebellar slice recordings with mossy fiber stimulation","journal":"Neurobiology of disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO granule cells with defined electrophysiological phenotypes, replicated in both primary cultures and acute slices","pmids":["33515674"],"is_preprint":false},{"year":2020,"finding":"PRRT2 is presynaptically localized in the cerebellar molecular layer (in granule cell axons/parallel fibers); PRRT2 KO mice have increased numbers of docked vesicles but decreased total vesicle numbers in cerebellar molecular layer synapses. KO mice show reduced parallel fiber facilitation and reduced Purkinje cell excitability, establishing cerebellar cortical dysfunction as a mechanism promoting disinhibition of cerebellar nuclei and motor abnormalities.","method":"lacZ reporter and RT-PCR for expression mapping; electron microscopy of cerebellar synapses; patch-clamp electrophysiology in cerebellar slices (parallel fiber-PC synapses, PC intrinsic excitability); behavioral motor tests; PRRT2 KO mouse","journal":"Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — EM, electrophysiology, and behavioral readouts in KO mouse; multiple orthogonal methods; replicates cerebellar findings from other labs","pmids":["32891704"],"is_preprint":false},{"year":2023,"finding":"The intramembrane COOH-terminal domain of PRRT2 is sufficient to modulate Nav1.2 Na+ current and channel biophysical properties, while the NH2-terminal cytoplasmic proline-rich region acts as a binding antenna for Nav1.2 channels. Both domains together (full-length PRRT2) show stronger Nav1.2 binding than either domain alone. The COOH-terminal domain maintains stable helix-loop-helix conformation in the membrane bilayer.","method":"Molecular dynamics simulations; biochemical binding/affinity assays (isolated domains vs full-length); patch-clamp electrophysiology in HEK cells expressing domain constructs; surface biotinylation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — domain-level structure-function with MD, biochemistry, and electrophysiology; single lab extending prior findings","pmids":["36958475"],"is_preprint":false},{"year":2023,"finding":"PRRT2 missense mutations in the transmembrane domain (A320V and V286M) differentially affect Nav1.2 binding and function: A320V shows decreased Nav1.2 binding and loss-of-function (no Nav1.2 modulation), while V286M shows increased binding and gain-of-function (more pronounced inactivation shift and slower recovery). Both mutations implicate residues A320 and V286 as part of the PRRT2-Nav1.2 interaction site.","method":"Molecular dynamics simulations; affinity/binding assays; surface biotinylation; patch-clamp electrophysiology in HEK cells expressing Nav1.2","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis with biophysical functional readouts; single lab","pmids":["37271286"],"is_preprint":false}],"current_model":"PRRT2 is a neuron-specific type II transmembrane protein (N_cyt/C_exo topology) enriched at presynaptic terminals where it functions as a multi-target regulator of neuronal excitability and neurotransmitter release: it directly interacts with SNARE proteins (SNAP25, STX1A, VAMP2, STX1B) to inhibit trans-SNARE complex assembly and suppress vesicle priming; binds synaptotagmin 1/2 to confer Ca2+ sensitivity to synchronous release; interacts with and suppresses the surface exposure and activity of Nav1.2/Nav1.6 (but not Nav1.1) voltage-gated Na+ channels; modulates P/Q-type Ca2+ channel clustering and presynaptic Ca2+ influx at the active zone; interacts with Na+/K+-ATPase pumps to support post-firing hyperpolarization; regulates synaptic actin dynamics via cofilin; and supports neuronal migration and synapse formation during development — with loss-of-function mutations (commonly via NMD-mediated mRNA decay) causing network hyperexcitability and the spectrum of paroxysmal disorders including PKD, BFIS, ICCA, and hemiplegic migraine."},"narrative":{"mechanistic_narrative":"PRRT2 is a neuron-specific, axonally and presynaptically enriched type II transmembrane protein that acts as a multi-target brake on neuronal excitability and neurotransmitter release [PMID:27052163, PMID:26797119, PMID:32891704]. It adopts an N_cyt/C_exo topology in which a second hydrophobic segment spans the membrane while the first forms an intracellular helix-loop-helix and the large proline-rich N-terminus remains cytoplasmic [PMID:26797119]. Through this cytoplasmic domain PRRT2 engages the synaptic SNARE machinery (SNAP25, STX1A, STX1B, VAMP2) to selectively block trans-SNARE complex assembly and negatively regulate synaptic vesicle priming, while its interaction with synaptotagmin 1/2 couples release to Ca2+ sensitivity for synchronous transmission [PMID:27052163, PMID:29346777, PMID:30009426, PMID:30347267]. PRRT2 additionally restrains intrinsic excitability by directly binding Nav1.2 and Nav1.6 (but not Nav1.1) channels — reducing their surface exposure and Na+ current and shifting inactivation — through a C-terminal intramembrane module that modulates channel gating and an N-terminal proline-rich \"antenna\" that mediates binding [PMID:29554219, PMID:36958475, PMID:37271286]. It also promotes P/Q-type (Cav2.1) Ca2+ channel membrane targeting and active-zone clustering to support presynaptic Ca2+ influx, and interacts with α1/α3 Na+/K+-ATPase pumps to sustain post-firing afterhyperpolarization [PMID:33731672, PMID:34133925]. Beyond release, PRRT2 controls synaptic actin dynamics via cofilin to regulate dendritic spine density and supports neuronal migration and synapse formation during development [PMID:33056987, PMID:27172900]. Loss of PRRT2 — most commonly through nonsense-mediated decay of truncating-mutation transcripts or mislocalization of missense variants — disrupts these functions, elongates the axon initial segment, and shifts excitatory/inhibitory balance toward network hyperexcitability, producing the spectrum of paroxysmal disorders modeled in KO and knock-in animals [PMID:25457817, PMID:29912316, PMID:31785815, PMID:30980674, PMID:33515674].","teleology":[{"year":2011,"claim":"Establishing that disease-causing truncating mutations alter PRRT2's subcellular distribution and reduce its abundance gave the first mechanistic link between the gene and a protein with a defined cellular localization, framing the disorders as loss-of-function.","evidence":"Localization assays and Western blotting of mutant vs wild-type PRRT2 in cells and primary neurons, with the first SNAP25 Co-IP","pmids":["22101681","22832103"],"confidence":"Medium","gaps":["Did not establish topology or the molecular consequence of SNARE binding","Single-lab Co-IP without reciprocal validation at this stage"]},{"year":2014,"claim":"Identifying nonsense-mediated mRNA decay as the route by which truncating mutations lower PRRT2 levels explained why patients are functionally haploinsufficient and showed that escaped truncated protein mislocalizes.","evidence":"NMD pharmacological and UPF1-siRNA rescue in lymphoblasts plus localization in SH-SY5Y cells","pmids":["25457817"],"confidence":"Medium","gaps":["Did not quantify dosage threshold for disease","Single lab"]},{"year":2016,"claim":"Defining PRRT2 as a presynaptically enriched type II transmembrane protein with an intracellular proline-rich domain, and showing its silencing impairs synchronous release and Ca2+ sensitivity, transformed it from a genetic locus into a defined regulator of the release machinery.","evidence":"Topology mapping (immunogold EM, surface biotinylation, live labeling, modeling); shRNA silencing with patch-clamp and EM; reciprocal Co-IP with SNAP-25, Syt1/2, and Intersectin 1","pmids":["27052163","26797119"],"confidence":"High","gaps":["Did not resolve whether SNARE binding is direct or scaffolded","Mechanism of priming suppression not yet reconstituted"]},{"year":2017,"claim":"Cerebellar granule-cell-specific conditional knockout recapitulating PKD-like behaviors localized PRRT2's circuit role and tied its SNARE-downregulating activity to a defined behavioral output.","evidence":"Conditional KO mouse, behavioral phenotyping, optogenetic stimulation with cerebellar slice recording, Co-IP with SNARE proteins","pmids":["29056747"],"confidence":"High","gaps":["Did not isolate which downstream effector (SNARE vs channels) drives the cerebellar phenotype"]},{"year":2018,"claim":"Reconstitution showing PRRT2's proline-rich domain blocks trans-SNARE assembly, plus discovery of direct Nav1.2/Nav1.6 modulation and STX1B binding, established two parallel mechanisms — release inhibition and Na+ channel suppression — and linked variant severity to molecular efficiency.","evidence":"In vitro single-vesicle/bulk fusion assays with disease-variant mutagenesis; HEK-cell Nav reconstitution with patch-clamp and biotinylation validated in iPSC and KO neurons; STX1B Co-IP with family segregation","pmids":["29346777","29554219","30009426","30347267"],"confidence":"High","gaps":["Did not define how a single protein coordinates SNARE and channel targets in vivo","AIS elongation mechanism downstream of Na+ channel changes unresolved"]},{"year":2019,"claim":"Knock-in of a frameshift mutation phenocopying KO, plus KO synapse-type-specific electrophysiology and missense membrane-targeting screens, confirmed haploinsufficiency as the disease mechanism and showed PRRT2 differentially shapes excitatory versus inhibitory transmission and E/I balance.","evidence":"Knock-in vs KO mouse comparison with mRNA half-life assays; KO hippocampal neuron patch-clamp and MEA; surface biotinylation of 13 missense variants","pmids":["31785815","29912316","30980674"],"confidence":"High","gaps":["Did not map how opposing excitatory/inhibitory effects integrate at network scale","Structural basis of C-terminal missense mistargeting not defined"]},{"year":2020,"claim":"Identifying cofilin as the effector for PRRT2's control of synaptic actin, and detailing cerebellar parallel-fiber/Purkinje-cell dysfunction, separated PRRT2's structural (spine/actin) role from its release role and connected cortical cerebellar deficits to motor abnormalities.","evidence":"shRNA silencing with live actin imaging and cofilin phospho-mimetic rescue; KO cerebellar EM, slice electrophysiology, and behavior","pmids":["33056987","32891704"],"confidence":"Medium","gaps":["Cofilin rescue did not restore release defects, leaving the link between actin and release unexplained","Mechanism connecting PRRT2 to cofilin activity not resolved"]},{"year":2021,"claim":"Discovery of direct PRRT2 interactions with Na+/K+-ATPase pumps and P/Q-type Ca2+ channels, alongside KO granule-cell Na+ channel and AIS phenotypes, expanded PRRT2 into a hub coordinating Ca2+ influx, ion homeostasis, and intrinsic excitability at the active zone.","evidence":"Pulldown proteomics, Co-IP, colocalization and afterhyperpolarization recordings (NKA); Co-IP/pull-down/proteomics with Ca2+ imaging and EPSCs (Cav2.1); KO granule-cell patch-clamp and slice recordings","pmids":["33731672","34133925","33515674"],"confidence":"High","gaps":["Did not establish stoichiometry or whether these interactions occur simultaneously in one complex","Structural interface with channels/pumps not resolved"]},{"year":2023,"claim":"Domain dissection assigning gating modulation to the C-terminal intramembrane helix-loop-helix and target binding to the N-terminal proline-rich antenna, with disease residues A320/V286 mapped to the Nav1.2 interface, provided a structure-function model distinguishing loss- from gain-of-function variants.","evidence":"Molecular dynamics simulations, isolated-domain and full-length binding assays, surface biotinylation, and patch-clamp in HEK cells","pmids":["36958475","37271286"],"confidence":"Medium","gaps":["Predictions rely on simulation and single-lab biochemistry without an experimental structure","Did not test whether the same domains govern SNARE and channel binding identically"]},{"year":null,"claim":"How PRRT2 physically and temporally coordinates its many partners — SNAREs, synaptotagmin, Nav and Cav channels, Na+/K+-ATPase, and the cofilin/actin system — into a unified presynaptic regulatory program remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No experimental structure of PRRT2 or its complexes","Stoichiometry and competition among partners undefined","How haploinsufficiency selectively produces paroxysmal rather than constant dysfunction is unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5,6,17,18]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[6,5]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[16]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5,13]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,8]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,5,11]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,16]}],"complexes":["SNARE complex"],"partners":["SNAP25","STX1A","STX1B","VAMP2","SYT1","SCN2A","CACNA1A","ITSN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7Z6L0","full_name":"Proline-rich transmembrane protein 2","aliases":["Dispanin subfamily B member 3","DSPB3"],"length_aa":340,"mass_kda":34.9,"function":"As a component of the outer core of AMPAR complex, may be involved in synaptic transmission in the central nervous system. In hippocampal neurons, in presynaptic terminals, plays an important role in the final steps of neurotransmitter release, possibly by regulating Ca(2+)-sensing. In the cerebellum, may inhibit SNARE complex formation and down-regulate short-term facilitation","subcellular_location":"Cell membrane; Presynaptic cell membrane; Synapse; Cell projection, axon; Cytoplasmic vesicle, secretory vesicle, synaptic vesicle membrane; Postsynaptic density membrane; Cell projection, dendritic spine","url":"https://www.uniprot.org/uniprotkb/Q7Z6L0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRRT2","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PRRT2","total_profiled":1310},"omim":[{"mim_id":"620245","title":"EPISODIC KINESIGENIC DYSKINESIA 3; EKD3","url":"https://www.omim.org/entry/620245"},{"mim_id":"620108","title":"TRANSMEMBRANE PROTEIN 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STX1B.","date":"2018","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/30009426","citation_count":12,"is_preprint":false},{"pmid":"24594579","id":"PMC_24594579","title":"Heterogeneous pattern of selective pressure for PRRT2 in human populations, but no association with autism spectrum disorders.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24594579","citation_count":12,"is_preprint":false},{"pmid":"31785815","id":"PMC_31785815","title":"PRRT2 frameshift mutation reduces its mRNA stability resulting loss of function in paroxysmal kinesigenic dyskinesia.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/31785815","citation_count":11,"is_preprint":false},{"pmid":"31902651","id":"PMC_31902651","title":"Familial hemiplegic migraine with a PRRT2 mutation: Phenotypic variations and carbamazepine efficacy.","date":"2020","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/31902651","citation_count":11,"is_preprint":false},{"pmid":"29285950","id":"PMC_29285950","title":"PRRT2 mutations in a cohort of Chinese families with paroxysmal kinesigenic dyskinesia and genotype-phenotype correlation reanalysis in literatures.","date":"2018","source":"The International journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/29285950","citation_count":11,"is_preprint":false},{"pmid":"25403460","id":"PMC_25403460","title":"Reduced Penetrance of PRRT2 Mutation in a Chinese Family With Infantile Convulsion and Choreoathetosis Syndrome.","date":"2014","source":"Journal of child neurology","url":"https://pubmed.ncbi.nlm.nih.gov/25403460","citation_count":11,"is_preprint":false},{"pmid":"33056987","id":"PMC_33056987","title":"Proline-rich transmembrane protein 2 (PRRT2) regulates the actin cytoskeleton during synaptogenesis.","date":"2020","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/33056987","citation_count":10,"is_preprint":false},{"pmid":"37271286","id":"PMC_37271286","title":"Missense mutations in the membrane domain of PRRT2 affect its interaction with Nav1.2 voltage-gated sodium channels.","date":"2023","source":"Neurobiology of disease","url":"https://pubmed.ncbi.nlm.nih.gov/37271286","citation_count":10,"is_preprint":false},{"pmid":"23566103","id":"PMC_23566103","title":"Mutations in PRRT2 are not a common cause of infantile epileptic encephalopathies.","date":"2013","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/23566103","citation_count":10,"is_preprint":false},{"pmid":"25520928","id":"PMC_25520928","title":"Successful control with carbamazepine of family with paroxysmal kinesigenic dyskinesia of PRRT2 mutation.","date":"2014","source":"BioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/25520928","citation_count":10,"is_preprint":false},{"pmid":"36958475","id":"PMC_36958475","title":"The intramembrane COOH-terminal domain of PRRT2 regulates voltage-dependent Na+ channels.","date":"2023","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36958475","citation_count":9,"is_preprint":false},{"pmid":"36187725","id":"PMC_36187725","title":"Efficacy, Tolerability, and Retention of Antiseizure Medications in PRRT2-Associated Infantile Epilepsy.","date":"2022","source":"Neurology. Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36187725","citation_count":9,"is_preprint":false},{"pmid":"34101060","id":"PMC_34101060","title":"Age-dependent neurological phenotypes in a mouse model of PRRT2-related diseases.","date":"2021","source":"Neurogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/34101060","citation_count":9,"is_preprint":false},{"pmid":"24755245","id":"PMC_24755245","title":"Unusual variability of PRRT2 linked phenotypes within a family.","date":"2014","source":"European journal of paediatric neurology : EJPN : official journal of the European Paediatric Neurology Society","url":"https://pubmed.ncbi.nlm.nih.gov/24755245","citation_count":9,"is_preprint":false},{"pmid":"28018471","id":"PMC_28018471","title":"Paroxysmal kinesigenic dyskinesia in a patient with a PRRT2 mutation and centrotemporal spike discharges on electroencephalogram: case report of a 10-year-old girl.","date":"2016","source":"Korean journal of pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/28018471","citation_count":8,"is_preprint":false},{"pmid":"26867511","id":"PMC_26867511","title":"Focal seizures and epileptic spasms in a child with Down syndrome from a family with a PRRT2 mutation.","date":"2016","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/26867511","citation_count":8,"is_preprint":false},{"pmid":"35382417","id":"PMC_35382417","title":"Characteristics of infantile convulsions and choreoathetosis syndrome caused by PRRT2 mutation.","date":"2022","source":"Pediatric investigation","url":"https://pubmed.ncbi.nlm.nih.gov/35382417","citation_count":7,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51162,"output_tokens":6266,"usd":0.123738,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15205,"output_tokens":3966,"usd":0.087587,"stage2_stop_reason":"end_turn"},"total_usd":0.211325,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"Truncating mutations in PRRT2 alter the subcellular localization of the PRRT2 protein, as demonstrated by direct experiment in cells expressing mutant versus wild-type PRRT2.\",\n      \"method\": \"Subcellular localization assay in cells expressing truncating mutants vs wild-type PRRT2\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single localization experiment, single lab, limited methodological detail in abstract\",\n      \"pmids\": [\"22101681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PRRT2 localizes to axons but not to dendritic processes in primary neuronal culture; truncating mutations associated with PKD/IC lead to dramatically reduced PRRT2 protein levels in neurons. PRRT2 was reported to interact with the t-SNARE SNAP25.\",\n      \"method\": \"Primary neuronal culture immunostaining; Western blotting of mutant vs wild-type expressing neurons; co-immunoprecipitation with SNAP25\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — axonal localization by immunostaining, SNAP25 interaction by Co-IP, reduced protein by Western blot; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"22832103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRRT2 is enriched in presynaptic terminals; its silencing decreases synapse number and increases docked synaptic vesicles at rest. PRRT2-silenced neurons show severe impairment of synchronous neurotransmitter release, decreased release probability and Ca2+ sensitivity, and increased asynchronous/synchronous release ratio. PRRT2 directly interacts with SNAP-25 and synaptotagmin 1/2.\",\n      \"method\": \"shRNA silencing in primary neurons; electrophysiology (patch-clamp); electron microscopy; co-immunoprecipitation of PRRT2 with SNAP-25 and Syt1/2\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, defined synaptic phenotype with electrophysiology and EM, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"27052163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRRT2 adopts a type II transmembrane topology in which only the second hydrophobic segment spans the plasma membrane, the first hydrophobic segment forms an intracellular helix-loop-helix without crossing the membrane, and the large proline-rich N-terminal domain is intracellular (N_cyt/C_exo). PRRT2 interacts with Intersectin 1, an intracellular protein involved in synaptic vesicle cycling.\",\n      \"method\": \"Live immunolabeling, immunogold electron microscopy, surface biotinylation, computational modeling, co-immunoprecipitation with Intersectin 1\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal structural/biochemical methods (immunogold EM, biotinylation, live labeling, computational modeling) in single study with functional validation\",\n      \"pmids\": [\"26797119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PRRT2 is a presynaptic protein that interacts with components of the SNARE complex and downregulates its formation. Loss-of-function in cerebellar granule cells causes PKD-like phenotypes; PRRT2 KO mice with granule cell-specific deletion recapitulate behavioral phenotypes, and cerebellar slice recordings show optogenetic stimulation of granule cells causes transient elevation followed by suppression of Purkinje cell firing.\",\n      \"method\": \"Co-immunoprecipitation with SNARE complex proteins; conditional KO mouse (cerebellar granule cell-specific); behavioral phenotyping; optogenetic stimulation with extracellular recording in cerebellar slices\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in conditional KO, Co-IP, circuit-level electrophysiology, behavioral readout; multiple orthogonal methods\",\n      \"pmids\": [\"29056747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRRT2 directly interacts with Nav1.2 and Nav1.6 (but not Nav1.1) channels, decreases their membrane surface exposure and Na+ current amplitude, induces a negative shift in voltage-dependence of inactivation, and slows recovery from inactivation. Loss of PRRT2 leads to increased Na+ currents and axon initial segment elongation in iPSC-derived neurons from homozygous patients and PRRT2 KO mice.\",\n      \"method\": \"HEK-293 cells stably expressing Nav subtypes; patch-clamp electrophysiology; surface biotinylation; co-immunoprecipitation in brain tissue; iPSC-derived neurons; multi-electrode array; PRRT2 KO mouse primary neurons\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted interaction in HEK cells with biophysical measurements, validated in human iPSC neurons and mouse KO neurons, Co-IP in native brain tissue, multiple orthogonal methods\",\n      \"pmids\": [\"29554219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRRT2 selectively blocks trans-SNARE complex assembly and negatively regulates synaptic vesicle priming, mediated by weak interactions of the N-terminal proline-rich domain with synaptic SNARE proteins. Disease-associated PRRT2 mutations disrupt this SNARE-modulatory function with efficiencies corresponding to phenotypic severity.\",\n      \"method\": \"Reconstituted single-vesicle and bulk fusion assays; live cell imaging of single exocytotic events in PC12 cells; biophysical analysis; mutagenesis of PRRT2 disease variants\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution assays, single-vesicle fusion, live cell imaging, mutagenesis with disease variant correlation\",\n      \"pmids\": [\"29346777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mutant PRRT2 (PKC-associated mutations) interferes with SNAP25 and GRIA1 (GluA1, AMPA receptor subunit) interactions; co-transfection with mutant PRRT2 increases GRIA1 surface distribution. Higher glutamate levels were observed in plasma of PKC patients and culture medium of Prrt2-knockdown neurons.\",\n      \"method\": \"Co-immunoprecipitation (PRRT2 with SNAP25 and GRIA1); live-labeling of surface GRIA1; double immunostaining; PRRT2 knockdown in neurons\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and live surface labeling in single lab; multiple readouts but no independent replication\",\n      \"pmids\": [\"25915028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Truncating PRRT2 mutations lead to nonsense-mediated mRNA decay (NMD), reducing PRRT2 mRNA and protein levels; inhibition of NMD rescues truncated PRRT2 mRNA. The small fraction of undegraded truncated protein mislocalizes from membrane to cytoplasm and nucleus.\",\n      \"method\": \"NMD inhibitors (emetine, cycloheximide) in lymphoblasts; UPF1 siRNA silencing; Western blot; subcellular localization of mutant PRRT2 in SH-SY5Y cells\",\n      \"journal\": \"Parkinsonism & related disorders\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional NMD rescue experiment with pharmacological and genetic inhibitors, combined with localization assay; single lab\",\n      \"pmids\": [\"25457817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRRT2 is expressed both pre- and post-synaptically; knockdown of Prrt2 in vivo (by in utero electroporation of shRNA) delays neuronal migration during embryonic development and markedly decreases synaptic density after birth. Truncating mutants accumulate in the cytoplasm and fail to reach the cell membrane.\",\n      \"method\": \"Synaptic membrane fractionation; immunostaining; in utero electroporation of shRNA in cortical neurons; confocal microscopy of subcellular localization\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KD with defined migration phenotype and synaptic density readout, combined with localization assay; single lab\",\n      \"pmids\": [\"27172900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRRT2 KO mice display paroxysmal movements at locomotion onset, abnormal motor behaviors, increased sensitivity to convulsants. Cerebellar patch-clamp shows higher excitatory strength at parallel fiber-Purkinje cell synapses during high-frequency stimulation. β-galactosidase reporter mapping reveals highest PRRT2 expression in cerebellum, hindbrain and spinal cord.\",\n      \"method\": \"Constitutive PRRT2 KO mouse; β-galactosidase reporter staining; patch-clamp electrophysiology in hippocampal and cerebellar slices; behavioral testing; pentylenetetrazol sensitivity\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive KO with defined cerebellar electrophysiology phenotype and behavioral readout; replicated in independent lab\",\n      \"pmids\": [\"28007585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Constitutive PRRT2 KO in hippocampal neurons decreases excitatory synapse number without affecting inhibitory synapses. Excitatory KO neurons show slowed exocytosis kinetics, weakened spontaneous and evoked synaptic transmission, and markedly increased facilitation. Inhibitory neurons show strengthened basal transmission and faster depression. At the network level, these effects result in heightened spontaneous and evoked activity and increased excitability of excitatory neurons.\",\n      \"method\": \"PRRT2 KO primary hippocampal neurons; live imaging (vesicle fusion); patch-clamp electrophysiology; multi-electrode array; acute hippocampal slices\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO with defined electrophysiological phenotypes across multiple synapse types and network level; multiple orthogonal methods\",\n      \"pmids\": [\"29912316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PRRT2 frameshift mutation (c.649_650InsC) reduces PRRT2 mRNA stability (shortened half-life), leading to loss of function. Knock-in mice expressing this mutation phenocopy KO mice (same rotarod/balance beam impairment, seizure sensitivity, altered SNARE complex, synaptic vesicle number changes). Truncated PRRT2 protein was undetectable in KI brain tissue.\",\n      \"method\": \"Prrt2 knock-in (KI) and KO mouse comparison; mRNA half-life measurement; behavioral testing; Western blot; SNARE complex assay; electron microscopy of synaptic vesicles\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — KI vs KO genetic comparison with identical phenotype, mRNA stability assay, multiple molecular and behavioral readouts\",\n      \"pmids\": [\"31785815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PRRT2 missense variants clustering near the C-terminus frequently impair protein targeting to the plasma membrane; 8 of 13 missense variants tested showed decreased membrane localization, while benign variants showed normal membrane localization similar to wild-type.\",\n      \"method\": \"Confocal microscopy of mutant PRRT2 subcellular localization; cell surface biotinylation assay in transfected cells\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — systematic surface biotinylation and imaging of 13 missense variants; single lab, two orthogonal methods\",\n      \"pmids\": [\"30980674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRRT2 directly interacts with STX1B (syntaxin 1B), a SNARE protein critical for neurotransmitter release; a truncating variant (p.Ser208Ilefs*17) lacking the helix-loop-helix domain fails to bind STX1B. The variant also abolishes normal membrane localization of PRRT2.\",\n      \"method\": \"Co-immunoprecipitation of PRRT2 with STX1B; Western blot; immunofluorescence subcellular localization in HeLa and N2A cells; whole exome sequencing with family segregation\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and localization assay in single lab; domain-deletion mutant identifies helix-loop-helix as required for STX1B binding\",\n      \"pmids\": [\"30009426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRRT2 negatively regulates SNARE complex assembly through interaction with SNAP25, STX1A, and VAMP2 in the M1 motor cortex. In PRRT2 truncated mutant rats, release of amino acid neurotransmitters is increased, GRIA1 protein levels are significantly increased, GABRA1 levels are reduced, mEPSC frequency and amplitude are increased, mIPSC amplitude is decreased, and the E/I balance is disrupted.\",\n      \"method\": \"PRRT2 truncated mutant rat model; Co-immunoprecipitation of SNARE proteins; neurotransmitter HPLC measurement; Western blot; patch-clamp (mEPSC/mIPSC)\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rat model with Co-IP, electrophysiology, and biochemistry; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30347267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PRRT2 silencing in non-neuronal cell lines inhibits cell motility, increases cell aggregation, promotes filopodia protrusion, and alters focal adhesion turnover — all processes involving actin cytoskeleton. In hippocampal neurons, PRRT2 silencing reduces synaptic filamentous actin, perturbs actin dynamics, and decreases dendritic spine density and maturation. Cofilin is identified as the effector: PRRT2 silencing unbalances cofilin activity, causing cofilin-actin rod formation; expression of phospho-mimetic cofilin (S3E) rescues spine defects but not neurotransmitter release alterations.\",\n      \"method\": \"shRNA silencing in non-neuronal cells and hippocampal neurons; live imaging of actin dynamics; phalloidin staining; dendritic spine morphometry; cofilin phospho-mimetic rescue experiment\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — silencing with defined cytoskeletal readouts, genetic rescue with cofilin mutant, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33056987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRRT2 directly interacts with α1 and α3 Na+/K+ ATPase (NKA) pumps in mouse brain. PRRT2 deficiency impairs NKA function during neuronal stimulation (without affecting expression or surface exposure), increases clustering of α3-NKA on plasma membrane, and reduces the NKA-dependent afterhyperpolarization following high-frequency firing. Re-expression of PRRT2 rescues all these phenotypes.\",\n      \"method\": \"Pulldown-based proteomics of mouse brain; co-immunoprecipitation; immunofluorescence colocalization; electrophysiology (afterhyperpolarization recording); PRRT2 re-expression rescue\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomics-identified interaction confirmed by Co-IP and colocalization, functional electrophysiological phenotype rescued by PRRT2 re-expression; multiple orthogonal methods\",\n      \"pmids\": [\"33731672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRRT2 directly interacts with P/Q-type (Cav2.1) Ca2+ channels via Co-IP, pull-down, and proteomics. PRRT2 deletion reduces P/Q-type channel membrane targeting (without changing total expression), decreases P/Q-type Ca2+ channel clustering at the presynaptic active zone, and reduces P/Q-dependent presynaptic Ca2+ signal and EPSC amplitude.\",\n      \"method\": \"Co-immunoprecipitation; pull-down assays; proteomics; surface biotinylation; electrophysiology (evoked EPSCs, somatic Ca2+ currents); two-photon imaging of presynaptic Ca2+ signals; PRRT2 acute and constitutive deletion\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct interaction confirmed by three independent biochemical methods, functional Ca2+ and electrophysiology phenotypes in both acute and constitutive KO\",\n      \"pmids\": [\"34133925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRRT2 KO cerebellar granule cells display increased Na+ channel expression, increased Na+ current amplitude, and increased axon initial segment length, leading to enhanced intrinsic excitability and greater action potential discharge in response to mossy fiber activation, without changes at mossy fiber-GC synapses.\",\n      \"method\": \"PRRT2 KO primary cerebellar granule cells; patch-clamp electrophysiology (transient and persistent Na+ currents, AIS measurement); acute cerebellar slice recordings with mossy fiber stimulation\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO granule cells with defined electrophysiological phenotypes, replicated in both primary cultures and acute slices\",\n      \"pmids\": [\"33515674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PRRT2 is presynaptically localized in the cerebellar molecular layer (in granule cell axons/parallel fibers); PRRT2 KO mice have increased numbers of docked vesicles but decreased total vesicle numbers in cerebellar molecular layer synapses. KO mice show reduced parallel fiber facilitation and reduced Purkinje cell excitability, establishing cerebellar cortical dysfunction as a mechanism promoting disinhibition of cerebellar nuclei and motor abnormalities.\",\n      \"method\": \"lacZ reporter and RT-PCR for expression mapping; electron microscopy of cerebellar synapses; patch-clamp electrophysiology in cerebellar slices (parallel fiber-PC synapses, PC intrinsic excitability); behavioral motor tests; PRRT2 KO mouse\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — EM, electrophysiology, and behavioral readouts in KO mouse; multiple orthogonal methods; replicates cerebellar findings from other labs\",\n      \"pmids\": [\"32891704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The intramembrane COOH-terminal domain of PRRT2 is sufficient to modulate Nav1.2 Na+ current and channel biophysical properties, while the NH2-terminal cytoplasmic proline-rich region acts as a binding antenna for Nav1.2 channels. Both domains together (full-length PRRT2) show stronger Nav1.2 binding than either domain alone. The COOH-terminal domain maintains stable helix-loop-helix conformation in the membrane bilayer.\",\n      \"method\": \"Molecular dynamics simulations; biochemical binding/affinity assays (isolated domains vs full-length); patch-clamp electrophysiology in HEK cells expressing domain constructs; surface biotinylation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — domain-level structure-function with MD, biochemistry, and electrophysiology; single lab extending prior findings\",\n      \"pmids\": [\"36958475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PRRT2 missense mutations in the transmembrane domain (A320V and V286M) differentially affect Nav1.2 binding and function: A320V shows decreased Nav1.2 binding and loss-of-function (no Nav1.2 modulation), while V286M shows increased binding and gain-of-function (more pronounced inactivation shift and slower recovery). Both mutations implicate residues A320 and V286 as part of the PRRT2-Nav1.2 interaction site.\",\n      \"method\": \"Molecular dynamics simulations; affinity/binding assays; surface biotinylation; patch-clamp electrophysiology in HEK cells expressing Nav1.2\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis with biophysical functional readouts; single lab\",\n      \"pmids\": [\"37271286\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRRT2 is a neuron-specific type II transmembrane protein (N_cyt/C_exo topology) enriched at presynaptic terminals where it functions as a multi-target regulator of neuronal excitability and neurotransmitter release: it directly interacts with SNARE proteins (SNAP25, STX1A, VAMP2, STX1B) to inhibit trans-SNARE complex assembly and suppress vesicle priming; binds synaptotagmin 1/2 to confer Ca2+ sensitivity to synchronous release; interacts with and suppresses the surface exposure and activity of Nav1.2/Nav1.6 (but not Nav1.1) voltage-gated Na+ channels; modulates P/Q-type Ca2+ channel clustering and presynaptic Ca2+ influx at the active zone; interacts with Na+/K+-ATPase pumps to support post-firing hyperpolarization; regulates synaptic actin dynamics via cofilin; and supports neuronal migration and synapse formation during development — with loss-of-function mutations (commonly via NMD-mediated mRNA decay) causing network hyperexcitability and the spectrum of paroxysmal disorders including PKD, BFIS, ICCA, and hemiplegic migraine.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRRT2 is a neuron-specific, axonally and presynaptically enriched type II transmembrane protein that acts as a multi-target brake on neuronal excitability and neurotransmitter release [#2, #3, #20]. It adopts an N_cyt/C_exo topology in which a second hydrophobic segment spans the membrane while the first forms an intracellular helix-loop-helix and the large proline-rich N-terminus remains cytoplasmic [#3]. Through this cytoplasmic domain PRRT2 engages the synaptic SNARE machinery (SNAP25, STX1A, STX1B, VAMP2) to selectively block trans-SNARE complex assembly and negatively regulate synaptic vesicle priming, while its interaction with synaptotagmin 1/2 couples release to Ca2+ sensitivity for synchronous transmission [#2, #6, #14, #15]. PRRT2 additionally restrains intrinsic excitability by directly binding Nav1.2 and Nav1.6 (but not Nav1.1) channels — reducing their surface exposure and Na+ current and shifting inactivation — through a C-terminal intramembrane module that modulates channel gating and an N-terminal proline-rich \\\"antenna\\\" that mediates binding [#5, #21, #22]. It also promotes P/Q-type (Cav2.1) Ca2+ channel membrane targeting and active-zone clustering to support presynaptic Ca2+ influx, and interacts with α1/α3 Na+/K+-ATPase pumps to sustain post-firing afterhyperpolarization [#17, #18]. Beyond release, PRRT2 controls synaptic actin dynamics via cofilin to regulate dendritic spine density and supports neuronal migration and synapse formation during development [#16, #9]. Loss of PRRT2 — most commonly through nonsense-mediated decay of truncating-mutation transcripts or mislocalization of missense variants — disrupts these functions, elongates the axon initial segment, and shifts excitatory/inhibitory balance toward network hyperexcitability, producing the spectrum of paroxysmal disorders modeled in KO and knock-in animals [#8, #11, #12, #13, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Establishing that disease-causing truncating mutations alter PRRT2's subcellular distribution and reduce its abundance gave the first mechanistic link between the gene and a protein with a defined cellular localization, framing the disorders as loss-of-function.\",\n      \"evidence\": \"Localization assays and Western blotting of mutant vs wild-type PRRT2 in cells and primary neurons, with the first SNAP25 Co-IP\",\n      \"pmids\": [\"22101681\", \"22832103\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish topology or the molecular consequence of SNARE binding\", \"Single-lab Co-IP without reciprocal validation at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying nonsense-mediated mRNA decay as the route by which truncating mutations lower PRRT2 levels explained why patients are functionally haploinsufficient and showed that escaped truncated protein mislocalizes.\",\n      \"evidence\": \"NMD pharmacological and UPF1-siRNA rescue in lymphoblasts plus localization in SH-SY5Y cells\",\n      \"pmids\": [\"25457817\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not quantify dosage threshold for disease\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defining PRRT2 as a presynaptically enriched type II transmembrane protein with an intracellular proline-rich domain, and showing its silencing impairs synchronous release and Ca2+ sensitivity, transformed it from a genetic locus into a defined regulator of the release machinery.\",\n      \"evidence\": \"Topology mapping (immunogold EM, surface biotinylation, live labeling, modeling); shRNA silencing with patch-clamp and EM; reciprocal Co-IP with SNAP-25, Syt1/2, and Intersectin 1\",\n      \"pmids\": [\"27052163\", \"26797119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether SNARE binding is direct or scaffolded\", \"Mechanism of priming suppression not yet reconstituted\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cerebellar granule-cell-specific conditional knockout recapitulating PKD-like behaviors localized PRRT2's circuit role and tied its SNARE-downregulating activity to a defined behavioral output.\",\n      \"evidence\": \"Conditional KO mouse, behavioral phenotyping, optogenetic stimulation with cerebellar slice recording, Co-IP with SNARE proteins\",\n      \"pmids\": [\"29056747\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not isolate which downstream effector (SNARE vs channels) drives the cerebellar phenotype\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reconstitution showing PRRT2's proline-rich domain blocks trans-SNARE assembly, plus discovery of direct Nav1.2/Nav1.6 modulation and STX1B binding, established two parallel mechanisms — release inhibition and Na+ channel suppression — and linked variant severity to molecular efficiency.\",\n      \"evidence\": \"In vitro single-vesicle/bulk fusion assays with disease-variant mutagenesis; HEK-cell Nav reconstitution with patch-clamp and biotinylation validated in iPSC and KO neurons; STX1B Co-IP with family segregation\",\n      \"pmids\": [\"29346777\", \"29554219\", \"30009426\", \"30347267\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how a single protein coordinates SNARE and channel targets in vivo\", \"AIS elongation mechanism downstream of Na+ channel changes unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Knock-in of a frameshift mutation phenocopying KO, plus KO synapse-type-specific electrophysiology and missense membrane-targeting screens, confirmed haploinsufficiency as the disease mechanism and showed PRRT2 differentially shapes excitatory versus inhibitory transmission and E/I balance.\",\n      \"evidence\": \"Knock-in vs KO mouse comparison with mRNA half-life assays; KO hippocampal neuron patch-clamp and MEA; surface biotinylation of 13 missense variants\",\n      \"pmids\": [\"31785815\", \"29912316\", \"30980674\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map how opposing excitatory/inhibitory effects integrate at network scale\", \"Structural basis of C-terminal missense mistargeting not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identifying cofilin as the effector for PRRT2's control of synaptic actin, and detailing cerebellar parallel-fiber/Purkinje-cell dysfunction, separated PRRT2's structural (spine/actin) role from its release role and connected cortical cerebellar deficits to motor abnormalities.\",\n      \"evidence\": \"shRNA silencing with live actin imaging and cofilin phospho-mimetic rescue; KO cerebellar EM, slice electrophysiology, and behavior\",\n      \"pmids\": [\"33056987\", \"32891704\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofilin rescue did not restore release defects, leaving the link between actin and release unexplained\", \"Mechanism connecting PRRT2 to cofilin activity not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery of direct PRRT2 interactions with Na+/K+-ATPase pumps and P/Q-type Ca2+ channels, alongside KO granule-cell Na+ channel and AIS phenotypes, expanded PRRT2 into a hub coordinating Ca2+ influx, ion homeostasis, and intrinsic excitability at the active zone.\",\n      \"evidence\": \"Pulldown proteomics, Co-IP, colocalization and afterhyperpolarization recordings (NKA); Co-IP/pull-down/proteomics with Ca2+ imaging and EPSCs (Cav2.1); KO granule-cell patch-clamp and slice recordings\",\n      \"pmids\": [\"33731672\", \"34133925\", \"33515674\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish stoichiometry or whether these interactions occur simultaneously in one complex\", \"Structural interface with channels/pumps not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Domain dissection assigning gating modulation to the C-terminal intramembrane helix-loop-helix and target binding to the N-terminal proline-rich antenna, with disease residues A320/V286 mapped to the Nav1.2 interface, provided a structure-function model distinguishing loss- from gain-of-function variants.\",\n      \"evidence\": \"Molecular dynamics simulations, isolated-domain and full-length binding assays, surface biotinylation, and patch-clamp in HEK cells\",\n      \"pmids\": [\"36958475\", \"37271286\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Predictions rely on simulation and single-lab biochemistry without an experimental structure\", \"Did not test whether the same domains govern SNARE and channel binding identically\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PRRT2 physically and temporally coordinates its many partners — SNAREs, synaptotagmin, Nav and Cav channels, Na+/K+-ATPase, and the cofilin/actin system — into a unified presynaptic regulatory program remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental structure of PRRT2 or its complexes\", \"Stoichiometry and competition among partners undefined\", \"How haploinsufficiency selectively produces paroxysmal rather than constant dysfunction is unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 6, 17, 18]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [6, 5]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5, 13]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 5, 11]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 16]}\n    ],\n    \"complexes\": [\"SNARE complex\"],\n    \"partners\": [\"SNAP25\", \"STX1A\", \"STX1B\", \"VAMP2\", \"SYT1\", \"SCN2A\", \"CACNA1A\", \"ITSN1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}