{"gene":"GRIA1","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2003,"finding":"Phosphorylation of GluR1 at Ser831 and Ser845 is required for LTP and LTD expression and spatial memory retention; knockin mice with alanine substitutions at both sites show deficits in bidirectional synaptic plasticity and spatial learning.","method":"Knockin mutagenesis (S831A/S845A double phosphomutant mice), hippocampal slice electrophysiology (LTP/LTD), behavioral memory tasks","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo knockin mutagenesis with electrophysiological and behavioral readouts, replicated across multiple paradigms in a single rigorous study and corroborated by follow-up studies","pmids":["12628184"],"is_preprint":false},{"year":2009,"finding":"The S845 phosphorylation site on GluR1 is specifically required for LTD expression in CA1, while S831 alone is dispensable; either S831 or S845 alone can support LTP.","method":"Single-site knockin mice (S831A or S845A), hippocampal slice electrophysiology (LTP/LTD at Schaffer collateral-CA1 synapses)","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — two separate knockin mouse lines with site-specific mutations, electrophysiological recordings, replicates and extends PMID 12628184","pmids":["19906877"],"is_preprint":false},{"year":2000,"finding":"PKA phosphorylation of GluR1 at Ser845 increases the peak open probability of homomeric GluR1 AMPA receptors without altering single-channel conductance, unitary current, or macroscopic response waveform; calcineurin reverses this effect. The S845A mutation abolishes the PKA-induced increase in open probability.","method":"Outside-out patch clamp recordings, purified PKA catalytic subunit and calcineurin inclusion in pipette, site-directed mutagenesis (S845A, S831A) in recombinant GluR1(flip) receptors","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzymatic assay combined with mutagenesis and single-channel electrophysiology, both neuronal and recombinant receptors tested","pmids":["10627585"],"is_preprint":false},{"year":2000,"finding":"GluR1 interacts with protein 4.1N and 4.1G via the membrane-proximal region of the GluR1 C-terminus; disruption of this interaction or actin filaments reduces GluR1 surface expression in heterologous cells and reduces surface AMPA receptors in cortical neurons, linking GluR1 to the actin cytoskeleton.","method":"Yeast two-hybrid, heterologous cell co-expression, in vivo co-immunoprecipitation, immunofluorescence co-localization, actin disruption experiments (latrunculin), surface biotinylation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays, in vivo Co-IP, multiple orthogonal methods across heterologous and neuronal systems","pmids":["11050113"],"is_preprint":false},{"year":2000,"finding":"D1 dopamine receptor activation increases GluR1 phosphorylation at Ser845 (via cAMP/PKA) but not at Ser831 in neostriatum; psychostimulants cocaine and methamphetamine also increase Ser845 phosphorylation in vivo; these effects are attenuated in DARPP-32 knockout mice, placing DARPP-32 upstream of GluR1 Ser845 phosphorylation.","method":"Phosphorylation site-specific antibodies, neostriatal slices, in vivo drug treatment, DARPP-32 knockout mice","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (DARPP-32 KO) combined with pharmacological and biochemical assays, multiple conditions tested","pmids":["10844017"],"is_preprint":false},{"year":2007,"finding":"Synaptic insertion of GluR1 is required (but not sufficient) to permit stable spine enlargement during LTP; this structural function is mediated through the GluR1 C-terminal domain independently of ion channel activity, as a cytosolic C-tail fragment alone is sufficient to permit spine enlargement when driven to the postsynaptic density.","method":"Hippocampal slice cultures and in vivo LTP induction, GluR1 mutants (ion channel dead), recombinant C-tail fragment expression, two-photon imaging of spine morphology","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis separating channel function from structural role, multiple constructs, in vitro and in vivo validation","pmids":["18077682"],"is_preprint":false},{"year":2007,"finding":"cGMP-dependent protein kinase II (cGKII) binds the GluR1 C-terminal domain adjacent to the kinase catalytic site; cGKII activation by cGMP increases this interaction and phosphorylates GluR1 at Ser845, increasing surface AMPAR expression at extrasynaptic sites; inhibition of cGKII blocks LTP in hippocampal slices.","method":"Co-immunoprecipitation from brain, pulldown assays, in vitro kinase assay, surface biotinylation, hippocampal slice LTP recordings, cGKII inhibitor experiments","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding mapped to kinase catalytic domain, in vitro phosphorylation, Co-IP from brain, functional electrophysiology, multiple orthogonal methods","pmids":["18031684"],"is_preprint":false},{"year":2010,"finding":"AMPA-induced (but not NMDA-induced) ubiquitination of GluA1 at C-terminal lysines by the E3 ligase Nedd4-1 mediates GluA1 internalization and trafficking to lysosomes; a ubiquitination-deficient GluA1 mutant (C-terminal lysine mutations) fails to be internalized to lysosomes in response to AMPA.","method":"Ubiquitination-deficient GluA1 mutants (C-terminal lysine mutations), Nedd4-1 overexpression/RNAi knockdown, live-cell imaging of receptor trafficking, AMPA vs NMDA agonist stimulation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — identified E3 ligase, site-specific mutation, gain- and loss-of-function for Nedd4-1, differential agonist comparison","pmids":["21148011"],"is_preprint":false},{"year":2015,"finding":"Activity-dependent ubiquitination of GluA1 at Lys-868 (and GluA2 at Lys-870/Lys-882) occurs exclusively on plasma membrane receptors post-endocytosis; this ubiquitination is Ca2+-dependent, requires L-type VGCCs and CaMKII, and controls intracellular trafficking to late endosomes/lysosomes for degradation rather than endocytosis per se.","method":"Site-directed mutagenesis of ubiquitination sites, ubiquitination assays in cultured neurons, Ca2+ channel/CaMKII inhibitors, late endosome trafficking assays, surface biotinylation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — precise site mapping by mutagenesis, pharmacological dissection of Ca2+ signaling pathway, distinction from endocytosis step","pmids":["25660027"],"is_preprint":false},{"year":2009,"finding":"The beta2-adrenergic receptor (β2AR) forms a supramolecular signaling complex with GluR1 through stargazin and PSD-95; PKA in this complex selectively phosphorylates GluR1 associated with β2AR upon β2AR stimulation, increasing GluR1 surface expression at postsynaptic sites and augmenting EPSC amplitudes in PFC slices.","method":"Co-immunoprecipitation, interference peptides disrupting β2AR-GluR1 association, surface biotinylation, electrophysiology (EPSC/mEPSC recordings in PFC slices)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of multiprotein complex, peptide disruption of specific interaction, functional electrophysiological readout, multiple methods","pmids":["19942860"],"is_preprint":false},{"year":2012,"finding":"S-nitrosylation of GluA1 at Cys875, downstream of NMDA receptor activation and NO production, enhances phosphorylation at Ser831, increases single-channel conductance, and promotes endocytosis by increasing GluA1 binding to the AP2 endocytic adaptor.","method":"S-nitrosylation site mapping (C875), site-directed mutagenesis, outside-out patch clamp single-channel recordings, AP2 co-immunoprecipitation, endocytosis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of nitrosylation site, electrophysiology, protein interaction assay, mechanistic cascade from NMDAR to GluA1 trafficking","pmids":["23277581"],"is_preprint":false},{"year":2012,"finding":"PKC phosphorylates GluA1 at Ser831 to increase AMPA receptor single-channel conductance; the S831A mutation blocks this PKC-induced conductance increase in GluA1 receptors co-expressed with stargazin.","method":"Outside-out patch clamp in HEK293T cells expressing GluA1 + stargazin, purified PKC catalytic subunit, S831A mutagenesis","journal":"Channels (Austin, Tex.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro enzymatic assay with purified kinase plus mutagenesis and electrophysiology","pmids":["22373567"],"is_preprint":false},{"year":2015,"finding":"PAK3, downstream of EphB2-Cdc42 signaling via Zizimin1 (a GEF for Cdc42), phosphorylates GluA1 at a previously unknown site Ser863 in vitro; loss or pharmacological inhibition of PAK3 disrupts activity-dependent S863 phosphorylation in cortical neurons, reducing GluA1 surface trafficking.","method":"In vitro kinase assay (PAK3 phosphorylation of GluA1), EphB2 co-immunoprecipitation, RNAi knockdown of PAK3, pharmacological PAK inhibition, surface biotinylation in cortical neurons","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay identifying PAK3 as writer, genetic and pharmacological loss-of-function, activity-dependent phosphorylation","pmids":["26460013"],"is_preprint":false},{"year":2011,"finding":"Phosphomimetic knockin mice (GluA1 S831D/S845D) show normal basal synaptic transmission but a lowered threshold for LTP induction (10-Hz and STDP protocols that are subthreshold in WT induce LTP), indicating that GluA1 phosphorylation at S831 and S845 is sufficient to lower the LTP induction threshold.","method":"Knockin phosphomimetic mice, hippocampal slice electrophysiology with multiple LTP induction protocols (theta-burst, 10-Hz, STDP), surface biotinylation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — gain-of-function phosphomimetic knock-in, multiple independent LTP protocols, rigorous controls for basal transmission","pmids":["21536866"],"is_preprint":false},{"year":2021,"finding":"The amino-terminal domain (ATD) of GluA1 is required for LTP maintenance; GluA1 ATD directly interacts with the cell adhesion molecule neuroplastin-65 (Np65), and deletion of Np65 or disruption of GluA1-Np65 binding severely impairs LTP maintenance, revealing an anchoring mechanism for AMPARs at the postsynaptic membrane.","method":"CRISPR/Cas9 deletion of endogenous AMPARs with single-neuron replacement by mutant forms, direct binding assay (GluA1 ATD–Np65 interaction), Np65 knockout, hippocampal slice LTP recordings","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — CRISPR-based single-neuron replacement strategy, direct protein interaction assay, genetic deletion of binding partner with LTP readout","pmids":["33627404"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structures of the GluA1 homotetramer fully occupied with TARPγ3 (GluA1/γ3) in resting and open states reveal that the sequence-diverse N-terminal domains (NTDs) create a highly mobile assembly enabling domain swapping and subunit re-alignments in the LBD tier that are pronounced in desensitized states; these transitions underlie GluA1's unique kinetic properties. A GluA2 F231A mutant that increases NTD dynamics phenocopies GluA1 behaviour and shows reduced synaptic responses, demonstrating that NTD anchoring function determines synaptic signalling efficiency.","method":"Cryo-electron microscopy structure determination (resting and open-state GluA1/γ3), site-directed mutagenesis (GluA2 F231A), electrophysiology","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structures with functional mutagenesis and electrophysiological validation in a single rigorous study","pmids":["37704721"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of GluA1/2-TARPγ8 in open and desensitized states reveal state-selective engagement of LBDs by the TARPγ8 β1 loop, showing how γ8 stabilizes specific gating states; TARPs alter channel rectification by interacting with the pore helix of the selectivity filter; the Q/R-editing site couples channel constriction at the filter entrance to the gate.","method":"Cryo-electron microscopy (3.5 Å resolution GluA1/2-γ8 open and desensitized state structures), electrophysiological validation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM with open and desensitized states, multiple mechanistic insights validated structurally","pmids":["35136046"],"is_preprint":false},{"year":2004,"finding":"The lurcher mutation in GluR1 primarily increases the receptor's affinity for glutamate and reduces desensitization at nanomolar glutamate concentrations, making channel opening and desensitization rate strongly dependent on subunit occupancy; GluR1Lc channels show little or no constitutive activity at ambient glutamate levels, contrary to previous reports.","method":"Kinetic analysis of GluR1Lc channels: leak current measurement with NBQX blockade, single-channel recordings, glutamate concentration-response analysis in HEK cells","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous kinetic analysis of lurcher mutant with quantitative single-channel electrophysiology and concentration-response characterization","pmids":["15163686"],"is_preprint":false},{"year":2001,"finding":"The GluR1 promoter lacks TATA and CAAT elements but contains two Sp1 binding sites; neuronal specificity resides in enhancer regions (-1395 to -743 and -253 to -48); the -253 to -202 region contains CRE sites and a glial silencing element; a 64-bp GA repeat upstream of transcription start sites increases activity, and an N-box-containing region reduces it.","method":"Promoter deletion analysis with luciferase reporter in primary cortical neurons and glia, immunocytochemistry, gel-shift assays (Sp1/CREB binding)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter functional analysis in primary neurons with multiple deletion constructs and transcription factor binding identification","pmids":["11340067"],"is_preprint":false},{"year":2005,"finding":"SGK3 (serum- and glucocorticoid-inducible kinase 3), downstream of PI3-kinase, increases GluR1 protein abundance in the cell membrane in Xenopus oocytes; hippocampal GluR1 abundance is significantly reduced in SGK3 knockout mice.","method":"Xenopus oocyte expression system with electrophysiology, SGK3 knockout mice with Western blotting, in situ hybridization","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — heterologous overexpression electrophysiology plus genetic knockout confirmation, single lab","pmids":["15774536"],"is_preprint":false},{"year":2012,"finding":"SGK3 promotes GluR1 plasma membrane delivery via a RAB11-dependent, PIKfyve/PI(3,5)P2-dependent trafficking pathway; PIKfyve inhibition reduces basal synaptic activity in CA1 and shifts GluA1 expression away from synapses in hippocampal neurons.","method":"Xenopus oocyte electrophysiology, dominant-negative RAB11, PIKfyve inhibitor (YM201636) in hippocampal slices and neurons, in vitro kinase assay (SGK3 phosphorylation of PIKfyve)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (electrophysiology, imaging, kinase assay), single lab","pmids":["22470488"],"is_preprint":false},{"year":2012,"finding":"JNK1 phosphorylates the transcriptional repressor Hes-1 at Ser263, stabilizing Hes-1 protein, which suppresses GluR1 promoter activity by binding the N-box and blocking Mash1/E47 from binding the E-box; this JNK1-Hes-1 pathway inhibits AMPA-evoked calcium influx in cortical neurons.","method":"In vitro kinase assay (JNK1 phosphorylation of Hes-1), promoter reporter assays, site-directed mutagenesis (N-box/E-box), overexpression/knockdown in rat cortical neurons, Ca2+ imaging","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis, promoter reporter, functional Ca2+ readout, single lab","pmids":["22302822"],"is_preprint":false},{"year":2014,"finding":"Casein kinase 2 (CK2) phosphorylates GluA1 at Ser579 within the intracellular loop1 region; knockdown of CK2 regulatory subunit CK2β reduces GluA1 surface expression, and expression of S579 phosphodeficient GluA1 in hippocampal neurons reduces surface expression.","method":"In vitro phosphorylation assay (panel of purified kinases), CK2β shRNA knockdown, S579A/phosphodeficient mutant expression, surface biotinylation in hippocampal neurons","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase screen plus site mutagenesis, genetic knockdown with surface expression readout, single lab","pmids":["24712994"],"is_preprint":false},{"year":2015,"finding":"FUS RNA-binding protein binds GluA1 mRNA near the 3' terminus and controls poly(A) tail maintenance to regulate GluA1 mRNA stability; FUS depletion downregulates GluA1 protein, reduces miniature EPSC amplitude in vitro and in vivo, impairs dendritic spine maturation, and causes hyperactivity/social interaction defects partially rescued by GluA1 reintroduction.","method":"FUS knockdown (siRNA/shRNA), RNA immunoprecipitation (FUS–GluA1 mRNA interaction), poly(A) tail assays, miniature EPSC recordings, spine morphology analysis, behavioral assays with GluA1 rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct RNA-protein interaction mapped, poly(A) tail mechanism, electrophysiology, structural plasticity, behavioral rescue with GluA1 reintroduction across multiple assays","pmids":["25968143"],"is_preprint":false},{"year":2015,"finding":"FXR2P binds and stabilizes GluA1 mRNA to enhance GluA1 protein expression, while FMRP promotes GluA1 membrane delivery; the two fragile X proteins thus regulate GluA1 via distinct mechanisms that additively promote neuronal maturation.","method":"FXR2P/FMRP knockout mice, RNA immunoprecipitation (FXR2P–GluA1 mRNA), surface biotinylation of GluA1, dendritic morphology analysis, behavioral learning assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal genetic knockouts, direct RNA-protein interaction, surface expression assay, mechanistic distinction between two proteins","pmids":["26051932"],"is_preprint":false},{"year":2020,"finding":"HNRNP A2/B1 interacts with an IRES in the GluA1 mRNA 5'UTR and mediates cap-independent (IRES-driven) translation of GluA1; BDNF stimulation upregulates HNRNP A2/B1 to increase IRES-mediated GluA1 translation and dendritic spine density; neurons lacking hnRNP A2/B1 show decreased BDNF-induced GluA1 expression.","method":"IRES reporter assays, RNA pulldown (hnRNP A2/B1–GluA1 mRNA interaction), hnRNP A2/B1 knockdown/overexpression, BDNF stimulation, spine density quantification","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA-protein interaction, IRES functional assay, genetic knockdown with BDNF stimulation context, single lab","pmids":["33219033"],"is_preprint":false},{"year":2014,"finding":"miR-92a represses GluA1 translation by binding the 3'UTR of GluA1 mRNA and is downregulated during activity blockade (TTX+AP5); blocking the miR-92a seed region in GluA1 or overexpressing miR-92a prevents homeostatic scaling up of synaptic GluA1-containing AMPARs.","method":"miR-92a 3'UTR reporter assay, TTX/AP5 activity blockade in hippocampal neurons, GluA1 3'UTR seed region deletion, miR-92a overexpression, surface AMPAR expression analysis","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct miRNA-mRNA interaction validated, gain- and loss-of-function for miR-92a, homeostatic scaling functional readout","pmids":["25017011"],"is_preprint":false},{"year":2015,"finding":"miR-501-3p targets the 3'UTR of GluA1 mRNA and suppresses GluA1 expression; miR-501-3p is upregulated in dendrites via NMDAR GluN2A subunit activation, and this upregulation is required for NMDA-induced suppression of GluA1 expression and long-lasting dendritic spine remodeling.","method":"Deep sequencing of 3'UTR pulldown miRNAs, 3'UTR luciferase reporter, miR-501-3p overexpression/inhibition, GluN2A-specific NMDAR blockers, spine morphology imaging","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'UTR targeting validated, dendritic local regulation confirmed with NMDAR subunit specificity, single lab","pmids":["25800054"],"is_preprint":false},{"year":2015,"finding":"TNF-α–driven TRAF2-TNIK association phosphorylates GluR1 and drives GluR1-containing AMPA receptor trafficking toward the plasma membrane in spinal dorsal horn neurons; Fbxo3-dependent ubiquitination of Fbxl2 regulates TRAF2 levels to modulate this TNIK/GluR1 cascade, contributing to neuropathic allodynia.","method":"Spinal nerve ligation model, TNIK-GluR1 co-immunoprecipitation, GluR1 phosphorylation assays, siRNA knockdown of TNIK/Fbxo3, intrathecal drug administration, behavioral allodynia assays","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP of TNIK-GluR1 complex, RNAi loss-of-function, pharmacological dissection, behavioral readout, single lab","pmids":["26674878"],"is_preprint":false},{"year":2021,"finding":"Phosphorylation of GluA1 Ser845 reduces binding of the clathrin adaptor AP2 to GluA1, thereby reducing clathrin-mediated internalization of AMPARs; FRAP experiments show S845 phosphorylation predominantly acts on receptor internalization rather than forward trafficking during synaptic plasticity.","method":"FRAP (fluorescence recovery after photobleaching), AP2-GluA1 co-immunoprecipitation, S845 phosphomutants, synaptic plasticity induction (LTP, synaptic upscaling)","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP with phosphomutants, direct AP2 binding assay, two forms of synaptic plasticity tested, single lab","pmids":["34369573"],"is_preprint":false},{"year":2002,"finding":"GluR1 AMPA receptor subunit overexpression in spinal motor neurons promotes dendritic arborization and filopodial outgrowth in a manner dependent on the Q/R editing site of GluR1 (which determines Ca2+ permeability); these effects are not blocked by NMDA receptor antagonism, suggesting a GluR1-specific, NMDAR-independent mechanism.","method":"Viral overexpression of GluR1 (Q vs R variants) in rat spinal motor neurons, quantitative dendritic morphometry, NMDA receptor blockade","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vivo overexpression with morphometric quantification, Q/R site mechanistic comparison, pharmacological control","pmids":["12223558"],"is_preprint":false},{"year":2009,"finding":"GluA1-independent LTP at CA3-CA1 synapses has a more sustained component induced via GluN2B-containing NMDARs, neuronal nitric oxide synthase, and PKC (regulators of GluA2 surface expression); this is distinct from the rapidly decaying GluA1-dependent LTP component.","method":"Gria1-/- mice, theta-burst LTP induction, nNOS inhibitors, PKC inhibitors, GluN2B antagonists, hippocampal slice electrophysiology","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus pharmacological epistasis, multiple inhibitors, single lab","pmids":["19302150"],"is_preprint":false},{"year":2015,"finding":"CPT1C (carnitine palmitoyltransferase 1C) interacts with GluA1 intracellularly and enhances surface expression of GluA1-containing AMPARs; the palmitoylable residue C585 of GluA1 is required for CPT1C-mediated trafficking enhancement, although CPT1C does not alter GluA1 palmitoylation state.","method":"Co-immunoprecipitation in heterologous cells, whole-cell patch clamp, surface biotinylation, C585 mutagenesis, co-localization imaging","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP binding, electrophysiology, site-specific mutagenesis, surface expression assay, single lab","pmids":["25698923"],"is_preprint":false},{"year":2018,"finding":"p85S6K isoform (but not p70S6K) is enriched in postsynaptic densities, interacts with GluA1 through SAP97 and AKAP79/150, and directly phosphorylates GluA1 at Ser845, thereby sustaining synaptic GluA1 levels and spine density; p85S6K is decreased in AD brain synaptosomal fractions, and its overexpression rescues synaptic deficits in AD model mice.","method":"Subcellular fractionation, Co-IP (p85S6K–GluA1 via SAP97/AKAP79/150), in vitro kinase assay (p85S6K→GluA1 Ser845), in situ proximity ligation assay, knockdown/overexpression in AD mice, behavioral and spine density analyses","journal":"Translational neurodegeneration","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay identifying phosphorylation site, Co-IP of complex, synaptic localization, functional rescue in disease model, single lab","pmids":["36624510"],"is_preprint":false},{"year":2002,"finding":"CXCR2 chemokine receptor co-expressed with GluR1 in HEK cells increases GluR1 apparent affinity for glutamate, channel open probability, and binding site cooperativity upon CXCL2 stimulation; C-terminal deletion of GluR1 abolishes this affinity change, implicating the C-terminus in CXCR2-GluR1 functional coupling.","method":"HEK cell co-expression electrophysiology, CXCL2 stimulation, GluR1 C-terminal deletion mutants, spontaneous EPSC recordings in cerebellar neurons","journal":"Journal of neuroimmunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, heterologous system, mechanism of coupling not directly determined","pmids":["12161022"],"is_preprint":false},{"year":2017,"finding":"R/G editing in the GluA2R flop isoform accelerates the rate of channel opening and desensitization in GluA1/2R heteromeric channels when GluA1 is in the flop form, but has no effect on channel-closing rate or EC50; GluA1 flip/flop status modulates the impact of GluA2 R/G editing on channel kinetics.","method":"Laser-pulse photolysis combined with whole-cell recording, systematic comparison of R/G editing × flip/flop variants in heteromeric GluA1/2R channels","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — rigorous kinetic analysis with defined splice/editing variants, but single lab","pmids":["29057893"],"is_preprint":false},{"year":2013,"finding":"CREB is required for basal synaptic maintenance of GluA1 within the postsynaptic density and for learning-induced increases in synaptic GluA1 and pSer845-GluA1; dominant-negative CREB reduces GluA1 in PSDs, decreases LTP, increases LTD, and blocks contextual fear conditioning-driven GluA1 trafficking to the PSD.","method":"Conditional dominant-negative CREB transgenic mice (CREBS133A), PSD fractionation, Western blotting with phospho-specific antibodies, hippocampal electrophysiology (mEPSC, LTP, LTD), contextual fear conditioning","journal":"Hippocampus","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function of CREB, biochemical PSD fractionation, electrophysiology, and behavioral assay, single lab","pmids":["23504989"],"is_preprint":false},{"year":1997,"finding":"25-40% of GluR1 (as well as GluR2 and GluR4) protein is located at the plasma membrane in stably transfected BHK cells; the surface-localized fraction corresponds to the fully glycosylated upper band on Western blots, indicating that complete glycosylation is required for GluR subunit trafficking to the cell surface.","method":"BS3 crosslinking, surface biotinylation/neutravidin precipitation, [3H]AMPA binding, glycopeptidase F treatment, Western blotting in stably transfected BHK cells","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical surface-labeling methods, enzymatic deglycosylation experiment establishing glycosylation-trafficking link","pmids":["9003049"],"is_preprint":false}],"current_model":"GluA1 (GRIA1) encodes a subunit of Ca2+-permeable AMPA-type glutamate receptors whose synaptic trafficking, channel properties, and structural plasticity are controlled by phosphorylation at multiple C-terminal sites (Ser831 by CaMKII/PKC, Ser845 by PKA/cGKII/p85S6K, Ser863 by PAK3, Ser579 by CK2), ubiquitination at Lys868 by Nedd4-1 directing lysosomal sorting, S-nitrosylation at Cys875 linking NMDAR-NO signaling to conductance and endocytosis, and interactions of its C-terminus with 4.1N/actin cytoskeleton, β2AR-stargazin-PSD95 signaling complexes, SAP97, and neuroplastin-65 that collectively regulate surface expression, LTP/LTD induction, and spine structural plasticity; cryo-EM structures reveal that GluA1's sequence-diverse N-terminal domain creates a mobile assembly that governs unique gating kinetics and synaptic anchoring efficiency."},"narrative":{"mechanistic_narrative":"GRIA1 encodes GluA1 (GluR1), a subunit of AMPA-type glutamate receptors whose synaptic abundance, channel behavior, and contribution to bidirectional plasticity are governed by a dense layer of post-translational and trafficking control [PMID:12628184, PMID:18077682]. Phosphorylation of the C-terminus at distinct sites integrates multiple kinase pathways: PKA phosphorylates Ser845 to raise channel open probability (reversed by calcineurin) [PMID:10627585], PKC and CaMKII act at Ser831 to increase single-channel conductance [PMID:22373567], CK2 modifies Ser579 [PMID:24712994], and PAK3 phosphorylates the site Ser863 downstream of EphB2–Cdc42 signaling [PMID:26460013]; Ser845 phosphorylation is required for LTD while either Ser831 or Ser845 supports LTP, and phosphomimetic substitution lowers the LTP induction threshold [PMID:12628184, PMID:19906877, PMID:21536866]. Ser845 phosphorylation controls surface residence largely by reducing GluA1 binding to the AP2 clathrin adaptor, limiting internalization [PMID:34369573]. Convergent signaling routes feed these modifications, including D1 dopamine receptor/DARPP-32-cAMP/PKA [PMID:10844017], cGKII binding the GluA1 C-terminus [PMID:18031684], and a β2-adrenergic receptor complex assembled through stargazin and PSD-95 [PMID:19942860]. Surface levels are further set by Nedd4-1-mediated ubiquitination at Lys868 directing post-endocytic receptors to lysosomes in a Ca2+/CaMKII-dependent manner [PMID:21148011, PMID:25660027], by S-nitrosylation at Cys875 that couples NMDAR-NO signaling to conductance, Ser831 phosphorylation and AP2-dependent endocytosis [PMID:23277581], and by C-terminal interactions with the 4.1N/actin cytoskeleton [PMID:11050113]. Beyond ion conduction, the GluA1 C-tail confers a structural plasticity function permitting LTP-associated spine enlargement independent of channel activity [PMID:18077682], while the amino-terminal domain anchors receptors at the postsynaptic membrane through neuroplastin-65 to sustain LTP [PMID:33627404]; cryo-EM of GluA1/TARP complexes shows that the sequence-diverse NTD forms a mobile assembly whose anchoring efficiency determines gating kinetics and synaptic signaling strength [PMID:37704721, PMID:35136046]. GluA1 expression is additionally tuned at the transcriptional, translational, and mRNA-stability levels by CREB [PMID:23504989], FUS and FXR2P/FMRP [PMID:25968143, PMID:26051932], hnRNP A2/B1-driven IRES translation [PMID:33219033], and the microRNAs miR-92a and miR-501-3p that regulate homeostatic scaling and activity-dependent spine remodeling [PMID:25017011, PMID:25800054].","teleology":[{"year":2000,"claim":"Established the enzymatic logic of GluA1 C-terminal phosphorylation: PKA at Ser845 raises channel open probability while a parallel cAMP/PKA pathway downstream of D1/DARPP-32 selectively writes Ser845 in vivo.","evidence":"Outside-out patch clamp with purified PKA/calcineurin and S845A/S831A mutants; phospho-specific antibodies in neostriatal slices with DARPP-32 knockout mice","pmids":["10627585","10844017"],"confidence":"High","gaps":["Did not establish which phosphatases reverse Ser845 in vivo beyond calcineurin","Did not separate gating effect from trafficking effect of Ser845"]},{"year":2000,"claim":"Linked the GluA1 C-terminus to the actin cytoskeleton, showing surface expression depends on a membrane-proximal 4.1N/4.1G interaction.","evidence":"Yeast two-hybrid, in vivo Co-IP, surface biotinylation, and actin disruption in heterologous cells and cortical neurons","pmids":["11050113"],"confidence":"High","gaps":["Did not define how 4.1N binding is regulated during plasticity","Did not connect 4.1N anchoring to specific phosphorylation events"]},{"year":2003,"claim":"Demonstrated in vivo that Ser831/Ser845 phosphorylation is required for bidirectional plasticity and spatial memory, moving these sites from biochemical markers to physiological determinants.","evidence":"S831A/S845A double knockin mice with hippocampal LTP/LTD recordings and behavioral memory tasks","pmids":["12628184"],"confidence":"High","gaps":["Did not resolve the individual contribution of each site","Did not address the channel-versus-trafficking basis of the deficit"]},{"year":2007,"claim":"Separated GluA1's structural role from its ion-channel role and identified cGKII as a Ser845 kinase coupling cGMP to surface delivery and LTP.","evidence":"Channel-dead and cytosolic C-tail constructs with two-photon spine imaging; cGKII Co-IP, in vitro kinase assay, biotinylation, and LTP recordings","pmids":["18077682","18031684"],"confidence":"High","gaps":["Did not identify the PSD effector through which the C-tail drives spine enlargement","Did not establish endogenous cGKII contribution to physiological LTP"]},{"year":2009,"claim":"Resolved site-specific division of labor (Ser845 required for LTD, either site sufficient for LTP) and showed receptor-selective PKA action via a β2AR–stargazin–PSD-95 complex.","evidence":"Single-site S831A/S845A knockin electrophysiology; Co-IP and interference peptides with EPSC recordings in PFC slices","pmids":["19906877","19942860"],"confidence":"High","gaps":["Did not define how the β2AR complex confines PKA to associated GluA1","Did not address whether other GPCRs use analogous scaffolds"]},{"year":2010,"claim":"Identified Nedd4-1 as the E3 ligase that ubiquitinates GluA1 C-terminal lysines after AMPA stimulation to route receptors to lysosomes, defining a degradative trafficking arm.","evidence":"Ubiquitination-deficient mutants, Nedd4-1 gain/loss-of-function, live-cell trafficking imaging, AMPA versus NMDA stimulation","pmids":["21148011"],"confidence":"High","gaps":["Did not pinpoint the exact lysine at this stage","Did not define deubiquitinase counterpart"]},{"year":2011,"claim":"Provided gain-of-function evidence that S831/S845 phosphorylation is sufficient to lower the LTP threshold, complementing the loss-of-function knockins.","evidence":"S831D/S845D phosphomimetic knockin mice with multiple LTP induction protocols and biotinylation","pmids":["21536866"],"confidence":"High","gaps":["Phosphomimetics do not fully reproduce dynamic phosphorylation","Did not resolve relative contribution of each pseudo-phosphorylated site"]},{"year":2012,"claim":"Expanded the modification map: PKC at Ser831 raises conductance, and NMDAR-driven S-nitrosylation at Cys875 couples NO signaling to conductance, Ser831 phosphorylation, and AP2-dependent endocytosis.","evidence":"Patch clamp with purified PKC and S831A in GluA1+stargazin; C875 mutagenesis, single-channel recording, AP2 Co-IP, endocytosis assays","pmids":["22373567","23277581"],"confidence":"High","gaps":["Did not establish stoichiometry between nitrosylation and phosphorylation in vivo","Did not identify the nitrosylase/denitrosylase enzymes"]},{"year":2015,"claim":"Mapped activity-dependent ubiquitination to Lys868 on plasma-membrane receptors and identified PAK3 (downstream of EphB2-Cdc42) as a kinase writing the new Ser863 site, broadening the trafficking control network.","evidence":"Site mutagenesis with Ca2+ channel/CaMKII inhibitors and endosome assays; in vitro PAK3 kinase assay, EphB2 Co-IP, PAK3 RNAi and inhibition with surface biotinylation","pmids":["25660027","26460013"],"confidence":"High","gaps":["Did not identify the E3 ligase acting at Lys868 in this context","Did not define the phosphatase removing Ser863"]},{"year":2015,"claim":"Established that GluA1 abundance is set translationally and post-transcriptionally by RNA-binding proteins and microRNAs, linking GluA1 expression to homeostatic scaling and neurodevelopmental behavior.","evidence":"FUS and FXR2P/FMRP knockdown/knockout with RIP, poly(A) and surface assays, mEPSC, and behavioral rescue; miR-92a 3'UTR reporter and homeostatic scaling assays","pmids":["25968143","26051932","25017011"],"confidence":"High","gaps":["Did not integrate these RNA-level controls with synaptic phosphorylation events","Did not establish in vivo hierarchy among the regulators"]},{"year":2021,"claim":"Defined an N-terminal-domain anchoring mechanism via neuroplastin-65 required for LTP maintenance, and refined Ser845's role as predominantly anti-internalization by reducing AP2 binding.","evidence":"CRISPR single-neuron AMPAR replacement with GluA1 ATD-Np65 binding assays and LTP; FRAP with S845 phosphomutants and AP2 Co-IP","pmids":["33627404","34369573"],"confidence":"High","gaps":["Did not resolve how Np65 anchoring is dynamically engaged during plasticity","Did not reconcile structural anchoring with C-tail-driven spine enlargement"]},{"year":2023,"claim":"Provided structural mechanism: cryo-EM of GluA1/TARP complexes showed the mobile sequence-diverse NTD assembly governs gating transitions and that NTD anchoring efficiency dictates synaptic signaling strength.","evidence":"Cryo-EM of resting/open/desensitized GluA1/γ3 and GluA1/2-γ8 states with GluA2 F231A mutagenesis and electrophysiology","pmids":["37704721","35136046"],"confidence":"High","gaps":["Did not capture phosphorylated or ubiquitinated receptor states structurally","Did not visualize NTD engagement with synaptic adhesion partners such as Np65"]},{"year":null,"claim":"How the many parallel inputs—C-terminal phosphorylation/ubiquitination/nitrosylation, NTD anchoring, cytoskeletal and scaffold interactions, and RNA-level expression control—are temporally coordinated at a single synapse during plasticity remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model linking modification timing to trafficking step","Structural basis of regulated states not determined","In vivo hierarchy among redundant kinases and RNA regulators unknown"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,6,7,9,37]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[7,8]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[8,10]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,5,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,6,9,10]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3,7,8,29,32]}],"complexes":["GluA1-TARP (stargazin/γ3/γ8) AMPA receptor complex","β2AR-stargazin-PSD-95 signaling complex","GluA1-SAP97-AKAP79/150-p85S6K complex"],"partners":["DLG4","CACNG2","NEDD4","AP2","EPB41L1","NPTN","PRKG2","DLG1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P42261","full_name":"Glutamate receptor 1","aliases":["AMPA-selective glutamate receptor 1","GluR-A","GluR-K1","Glutamate receptor ionotropic, AMPA 1"],"length_aa":906,"mass_kda":101.5,"function":"Ionotropic glutamate receptor that functions as a ligand-gated cation channel, gated by L-glutamate and glutamatergic agonists such as alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), quisqualic acid, and kainic acid (PubMed:1311100, PubMed:20805473, PubMed:21172611, PubMed:28628100, PubMed:35675825). L-glutamate acts as an excitatory neurotransmitter at many synapses in the central nervous system. Binding of the excitatory neurotransmitter L-glutamate induces a conformation change, leading to the opening of the cation channel, and thereby converts the chemical signal to an electrical impulse upon entry of monovalent and divalent cations such as sodium and calcium. The receptor then desensitizes rapidly and enters in a transient inactive state, characterized by the presence of bound agonist (By similarity). In the presence of CACNG2 or CACNG4 or CACNG7 or CACNG8, shows resensitization which is characterized by a delayed accumulation of current flux upon continued application of L-glutamate (PubMed:21172611). Resensitization is blocked by CNIH2 through interaction with CACNG8 in the CACNG8-containing AMPA receptors complex (PubMed:21172611). Calcium (Ca(2+)) permeability depends on subunits composition and, heteromeric channels containing edited GRIA2 subunit are calcium-impermeable. Also permeable to other divalents cations such as strontium(2+) and magnesium(2+) and monovalent cations such as potassium(1+) and lithium(1+) (By similarity)","subcellular_location":"Cell membrane; Endoplasmic reticulum membrane; Postsynaptic cell membrane; Postsynaptic density membrane; Cell projection, dendrite; Cell projection, dendritic spine; Early endosome membrane; Recycling endosome membrane; Presynapse; Synapse","url":"https://www.uniprot.org/uniprotkb/P42261/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GRIA1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GRIA1","total_profiled":1310},"omim":[{"mim_id":"619931","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 76; MRT76","url":"https://www.omim.org/entry/619931"},{"mim_id":"619927","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL DOMINANT 67; MRD67","url":"https://www.omim.org/entry/619927"},{"mim_id":"619624","title":"LEMUR TYROSINE KINASE 3; LMTK3","url":"https://www.omim.org/entry/619624"},{"mim_id":"618917","title":"NEURODEVELOPMENTAL DISORDER WITH LANGUAGE IMPAIRMENT AND BEHAVIORAL ABNORMALITIES; NEDLIB","url":"https://www.omim.org/entry/618917"},{"mim_id":"618688","title":"LEUKODYSTROPHY, HYPOMYELINATING, 19, TRANSIENT INFANTILE; HLD19","url":"https://www.omim.org/entry/618688"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":54.8},{"tissue":"retina","ntpm":29.4}],"url":"https://www.proteinatlas.org/search/GRIA1"},"hgnc":{"alias_symbol":["GluA1","GLURA"],"prev_symbol":["GLUR1"]},"alphafold":{"accession":"P42261","domains":[{"cath_id":"3.40.50.2300","chopping":"22-127_258-361","consensus_level":"medium","plddt":88.2517,"start":22,"end":361},{"cath_id":"3.40.50.2300","chopping":"128-254_363-389","consensus_level":"high","plddt":88.1534,"start":128,"end":389},{"cath_id":"3.40.190.10","chopping":"403-511","consensus_level":"high","plddt":89.0717,"start":403,"end":511},{"cath_id":"3.40.190.10","chopping":"517-521_645-742","consensus_level":"high","plddt":91.6549,"start":517,"end":742},{"cath_id":"1.10.287","chopping":"529-565_584-640_802-832","consensus_level":"high","plddt":84.2005,"start":529,"end":832}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P42261","model_url":"https://alphafold.ebi.ac.uk/files/AF-P42261-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P42261-F1-predicted_aligned_error_v6.png","plddt_mean":81.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GRIA1","jax_strain_url":"https://www.jax.org/strain/search?query=GRIA1"},"sequence":{"accession":"P42261","fasta_url":"https://rest.uniprot.org/uniprotkb/P42261.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P42261/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P42261"}},"corpus_meta":[{"pmid":"12628184","id":"PMC_12628184","title":"Phosphorylation 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(LTP/LTD), behavioral memory tasks\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo knockin mutagenesis with electrophysiological and behavioral readouts, replicated across multiple paradigms in a single rigorous study and corroborated by follow-up studies\",\n      \"pmids\": [\"12628184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The S845 phosphorylation site on GluR1 is specifically required for LTD expression in CA1, while S831 alone is dispensable; either S831 or S845 alone can support LTP.\",\n      \"method\": \"Single-site knockin mice (S831A or S845A), hippocampal slice electrophysiology (LTP/LTD at Schaffer collateral-CA1 synapses)\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — two separate knockin mouse lines with site-specific mutations, electrophysiological recordings, replicates and extends PMID 12628184\",\n      \"pmids\": [\"19906877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PKA phosphorylation of GluR1 at Ser845 increases the peak open probability of homomeric GluR1 AMPA receptors without altering single-channel conductance, unitary current, or macroscopic response waveform; calcineurin reverses this effect. The S845A mutation abolishes the PKA-induced increase in open probability.\",\n      \"method\": \"Outside-out patch clamp recordings, purified PKA catalytic subunit and calcineurin inclusion in pipette, site-directed mutagenesis (S845A, S831A) in recombinant GluR1(flip) receptors\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzymatic assay combined with mutagenesis and single-channel electrophysiology, both neuronal and recombinant receptors tested\",\n      \"pmids\": [\"10627585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GluR1 interacts with protein 4.1N and 4.1G via the membrane-proximal region of the GluR1 C-terminus; disruption of this interaction or actin filaments reduces GluR1 surface expression in heterologous cells and reduces surface AMPA receptors in cortical neurons, linking GluR1 to the actin cytoskeleton.\",\n      \"method\": \"Yeast two-hybrid, heterologous cell co-expression, in vivo co-immunoprecipitation, immunofluorescence co-localization, actin disruption experiments (latrunculin), surface biotinylation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays, in vivo Co-IP, multiple orthogonal methods across heterologous and neuronal systems\",\n      \"pmids\": [\"11050113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"D1 dopamine receptor activation increases GluR1 phosphorylation at Ser845 (via cAMP/PKA) but not at Ser831 in neostriatum; psychostimulants cocaine and methamphetamine also increase Ser845 phosphorylation in vivo; these effects are attenuated in DARPP-32 knockout mice, placing DARPP-32 upstream of GluR1 Ser845 phosphorylation.\",\n      \"method\": \"Phosphorylation site-specific antibodies, neostriatal slices, in vivo drug treatment, DARPP-32 knockout mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (DARPP-32 KO) combined with pharmacological and biochemical assays, multiple conditions tested\",\n      \"pmids\": [\"10844017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Synaptic insertion of GluR1 is required (but not sufficient) to permit stable spine enlargement during LTP; this structural function is mediated through the GluR1 C-terminal domain independently of ion channel activity, as a cytosolic C-tail fragment alone is sufficient to permit spine enlargement when driven to the postsynaptic density.\",\n      \"method\": \"Hippocampal slice cultures and in vivo LTP induction, GluR1 mutants (ion channel dead), recombinant C-tail fragment expression, two-photon imaging of spine morphology\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis separating channel function from structural role, multiple constructs, in vitro and in vivo validation\",\n      \"pmids\": [\"18077682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"cGMP-dependent protein kinase II (cGKII) binds the GluR1 C-terminal domain adjacent to the kinase catalytic site; cGKII activation by cGMP increases this interaction and phosphorylates GluR1 at Ser845, increasing surface AMPAR expression at extrasynaptic sites; inhibition of cGKII blocks LTP in hippocampal slices.\",\n      \"method\": \"Co-immunoprecipitation from brain, pulldown assays, in vitro kinase assay, surface biotinylation, hippocampal slice LTP recordings, cGKII inhibitor experiments\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding mapped to kinase catalytic domain, in vitro phosphorylation, Co-IP from brain, functional electrophysiology, multiple orthogonal methods\",\n      \"pmids\": [\"18031684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AMPA-induced (but not NMDA-induced) ubiquitination of GluA1 at C-terminal lysines by the E3 ligase Nedd4-1 mediates GluA1 internalization and trafficking to lysosomes; a ubiquitination-deficient GluA1 mutant (C-terminal lysine mutations) fails to be internalized to lysosomes in response to AMPA.\",\n      \"method\": \"Ubiquitination-deficient GluA1 mutants (C-terminal lysine mutations), Nedd4-1 overexpression/RNAi knockdown, live-cell imaging of receptor trafficking, AMPA vs NMDA agonist stimulation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — identified E3 ligase, site-specific mutation, gain- and loss-of-function for Nedd4-1, differential agonist comparison\",\n      \"pmids\": [\"21148011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Activity-dependent ubiquitination of GluA1 at Lys-868 (and GluA2 at Lys-870/Lys-882) occurs exclusively on plasma membrane receptors post-endocytosis; this ubiquitination is Ca2+-dependent, requires L-type VGCCs and CaMKII, and controls intracellular trafficking to late endosomes/lysosomes for degradation rather than endocytosis per se.\",\n      \"method\": \"Site-directed mutagenesis of ubiquitination sites, ubiquitination assays in cultured neurons, Ca2+ channel/CaMKII inhibitors, late endosome trafficking assays, surface biotinylation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — precise site mapping by mutagenesis, pharmacological dissection of Ca2+ signaling pathway, distinction from endocytosis step\",\n      \"pmids\": [\"25660027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The beta2-adrenergic receptor (β2AR) forms a supramolecular signaling complex with GluR1 through stargazin and PSD-95; PKA in this complex selectively phosphorylates GluR1 associated with β2AR upon β2AR stimulation, increasing GluR1 surface expression at postsynaptic sites and augmenting EPSC amplitudes in PFC slices.\",\n      \"method\": \"Co-immunoprecipitation, interference peptides disrupting β2AR-GluR1 association, surface biotinylation, electrophysiology (EPSC/mEPSC recordings in PFC slices)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of multiprotein complex, peptide disruption of specific interaction, functional electrophysiological readout, multiple methods\",\n      \"pmids\": [\"19942860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"S-nitrosylation of GluA1 at Cys875, downstream of NMDA receptor activation and NO production, enhances phosphorylation at Ser831, increases single-channel conductance, and promotes endocytosis by increasing GluA1 binding to the AP2 endocytic adaptor.\",\n      \"method\": \"S-nitrosylation site mapping (C875), site-directed mutagenesis, outside-out patch clamp single-channel recordings, AP2 co-immunoprecipitation, endocytosis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of nitrosylation site, electrophysiology, protein interaction assay, mechanistic cascade from NMDAR to GluA1 trafficking\",\n      \"pmids\": [\"23277581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PKC phosphorylates GluA1 at Ser831 to increase AMPA receptor single-channel conductance; the S831A mutation blocks this PKC-induced conductance increase in GluA1 receptors co-expressed with stargazin.\",\n      \"method\": \"Outside-out patch clamp in HEK293T cells expressing GluA1 + stargazin, purified PKC catalytic subunit, S831A mutagenesis\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzymatic assay with purified kinase plus mutagenesis and electrophysiology\",\n      \"pmids\": [\"22373567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PAK3, downstream of EphB2-Cdc42 signaling via Zizimin1 (a GEF for Cdc42), phosphorylates GluA1 at a previously unknown site Ser863 in vitro; loss or pharmacological inhibition of PAK3 disrupts activity-dependent S863 phosphorylation in cortical neurons, reducing GluA1 surface trafficking.\",\n      \"method\": \"In vitro kinase assay (PAK3 phosphorylation of GluA1), EphB2 co-immunoprecipitation, RNAi knockdown of PAK3, pharmacological PAK inhibition, surface biotinylation in cortical neurons\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay identifying PAK3 as writer, genetic and pharmacological loss-of-function, activity-dependent phosphorylation\",\n      \"pmids\": [\"26460013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Phosphomimetic knockin mice (GluA1 S831D/S845D) show normal basal synaptic transmission but a lowered threshold for LTP induction (10-Hz and STDP protocols that are subthreshold in WT induce LTP), indicating that GluA1 phosphorylation at S831 and S845 is sufficient to lower the LTP induction threshold.\",\n      \"method\": \"Knockin phosphomimetic mice, hippocampal slice electrophysiology with multiple LTP induction protocols (theta-burst, 10-Hz, STDP), surface biotinylation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — gain-of-function phosphomimetic knock-in, multiple independent LTP protocols, rigorous controls for basal transmission\",\n      \"pmids\": [\"21536866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The amino-terminal domain (ATD) of GluA1 is required for LTP maintenance; GluA1 ATD directly interacts with the cell adhesion molecule neuroplastin-65 (Np65), and deletion of Np65 or disruption of GluA1-Np65 binding severely impairs LTP maintenance, revealing an anchoring mechanism for AMPARs at the postsynaptic membrane.\",\n      \"method\": \"CRISPR/Cas9 deletion of endogenous AMPARs with single-neuron replacement by mutant forms, direct binding assay (GluA1 ATD–Np65 interaction), Np65 knockout, hippocampal slice LTP recordings\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — CRISPR-based single-neuron replacement strategy, direct protein interaction assay, genetic deletion of binding partner with LTP readout\",\n      \"pmids\": [\"33627404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structures of the GluA1 homotetramer fully occupied with TARPγ3 (GluA1/γ3) in resting and open states reveal that the sequence-diverse N-terminal domains (NTDs) create a highly mobile assembly enabling domain swapping and subunit re-alignments in the LBD tier that are pronounced in desensitized states; these transitions underlie GluA1's unique kinetic properties. A GluA2 F231A mutant that increases NTD dynamics phenocopies GluA1 behaviour and shows reduced synaptic responses, demonstrating that NTD anchoring function determines synaptic signalling efficiency.\",\n      \"method\": \"Cryo-electron microscopy structure determination (resting and open-state GluA1/γ3), site-directed mutagenesis (GluA2 F231A), electrophysiology\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structures with functional mutagenesis and electrophysiological validation in a single rigorous study\",\n      \"pmids\": [\"37704721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of GluA1/2-TARPγ8 in open and desensitized states reveal state-selective engagement of LBDs by the TARPγ8 β1 loop, showing how γ8 stabilizes specific gating states; TARPs alter channel rectification by interacting with the pore helix of the selectivity filter; the Q/R-editing site couples channel constriction at the filter entrance to the gate.\",\n      \"method\": \"Cryo-electron microscopy (3.5 Å resolution GluA1/2-γ8 open and desensitized state structures), electrophysiological validation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM with open and desensitized states, multiple mechanistic insights validated structurally\",\n      \"pmids\": [\"35136046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The lurcher mutation in GluR1 primarily increases the receptor's affinity for glutamate and reduces desensitization at nanomolar glutamate concentrations, making channel opening and desensitization rate strongly dependent on subunit occupancy; GluR1Lc channels show little or no constitutive activity at ambient glutamate levels, contrary to previous reports.\",\n      \"method\": \"Kinetic analysis of GluR1Lc channels: leak current measurement with NBQX blockade, single-channel recordings, glutamate concentration-response analysis in HEK cells\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous kinetic analysis of lurcher mutant with quantitative single-channel electrophysiology and concentration-response characterization\",\n      \"pmids\": [\"15163686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The GluR1 promoter lacks TATA and CAAT elements but contains two Sp1 binding sites; neuronal specificity resides in enhancer regions (-1395 to -743 and -253 to -48); the -253 to -202 region contains CRE sites and a glial silencing element; a 64-bp GA repeat upstream of transcription start sites increases activity, and an N-box-containing region reduces it.\",\n      \"method\": \"Promoter deletion analysis with luciferase reporter in primary cortical neurons and glia, immunocytochemistry, gel-shift assays (Sp1/CREB binding)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter functional analysis in primary neurons with multiple deletion constructs and transcription factor binding identification\",\n      \"pmids\": [\"11340067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SGK3 (serum- and glucocorticoid-inducible kinase 3), downstream of PI3-kinase, increases GluR1 protein abundance in the cell membrane in Xenopus oocytes; hippocampal GluR1 abundance is significantly reduced in SGK3 knockout mice.\",\n      \"method\": \"Xenopus oocyte expression system with electrophysiology, SGK3 knockout mice with Western blotting, in situ hybridization\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — heterologous overexpression electrophysiology plus genetic knockout confirmation, single lab\",\n      \"pmids\": [\"15774536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SGK3 promotes GluR1 plasma membrane delivery via a RAB11-dependent, PIKfyve/PI(3,5)P2-dependent trafficking pathway; PIKfyve inhibition reduces basal synaptic activity in CA1 and shifts GluA1 expression away from synapses in hippocampal neurons.\",\n      \"method\": \"Xenopus oocyte electrophysiology, dominant-negative RAB11, PIKfyve inhibitor (YM201636) in hippocampal slices and neurons, in vitro kinase assay (SGK3 phosphorylation of PIKfyve)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (electrophysiology, imaging, kinase assay), single lab\",\n      \"pmids\": [\"22470488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JNK1 phosphorylates the transcriptional repressor Hes-1 at Ser263, stabilizing Hes-1 protein, which suppresses GluR1 promoter activity by binding the N-box and blocking Mash1/E47 from binding the E-box; this JNK1-Hes-1 pathway inhibits AMPA-evoked calcium influx in cortical neurons.\",\n      \"method\": \"In vitro kinase assay (JNK1 phosphorylation of Hes-1), promoter reporter assays, site-directed mutagenesis (N-box/E-box), overexpression/knockdown in rat cortical neurons, Ca2+ imaging\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis, promoter reporter, functional Ca2+ readout, single lab\",\n      \"pmids\": [\"22302822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Casein kinase 2 (CK2) phosphorylates GluA1 at Ser579 within the intracellular loop1 region; knockdown of CK2 regulatory subunit CK2β reduces GluA1 surface expression, and expression of S579 phosphodeficient GluA1 in hippocampal neurons reduces surface expression.\",\n      \"method\": \"In vitro phosphorylation assay (panel of purified kinases), CK2β shRNA knockdown, S579A/phosphodeficient mutant expression, surface biotinylation in hippocampal neurons\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase screen plus site mutagenesis, genetic knockdown with surface expression readout, single lab\",\n      \"pmids\": [\"24712994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FUS RNA-binding protein binds GluA1 mRNA near the 3' terminus and controls poly(A) tail maintenance to regulate GluA1 mRNA stability; FUS depletion downregulates GluA1 protein, reduces miniature EPSC amplitude in vitro and in vivo, impairs dendritic spine maturation, and causes hyperactivity/social interaction defects partially rescued by GluA1 reintroduction.\",\n      \"method\": \"FUS knockdown (siRNA/shRNA), RNA immunoprecipitation (FUS–GluA1 mRNA interaction), poly(A) tail assays, miniature EPSC recordings, spine morphology analysis, behavioral assays with GluA1 rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct RNA-protein interaction mapped, poly(A) tail mechanism, electrophysiology, structural plasticity, behavioral rescue with GluA1 reintroduction across multiple assays\",\n      \"pmids\": [\"25968143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FXR2P binds and stabilizes GluA1 mRNA to enhance GluA1 protein expression, while FMRP promotes GluA1 membrane delivery; the two fragile X proteins thus regulate GluA1 via distinct mechanisms that additively promote neuronal maturation.\",\n      \"method\": \"FXR2P/FMRP knockout mice, RNA immunoprecipitation (FXR2P–GluA1 mRNA), surface biotinylation of GluA1, dendritic morphology analysis, behavioral learning assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal genetic knockouts, direct RNA-protein interaction, surface expression assay, mechanistic distinction between two proteins\",\n      \"pmids\": [\"26051932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HNRNP A2/B1 interacts with an IRES in the GluA1 mRNA 5'UTR and mediates cap-independent (IRES-driven) translation of GluA1; BDNF stimulation upregulates HNRNP A2/B1 to increase IRES-mediated GluA1 translation and dendritic spine density; neurons lacking hnRNP A2/B1 show decreased BDNF-induced GluA1 expression.\",\n      \"method\": \"IRES reporter assays, RNA pulldown (hnRNP A2/B1–GluA1 mRNA interaction), hnRNP A2/B1 knockdown/overexpression, BDNF stimulation, spine density quantification\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-protein interaction, IRES functional assay, genetic knockdown with BDNF stimulation context, single lab\",\n      \"pmids\": [\"33219033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-92a represses GluA1 translation by binding the 3'UTR of GluA1 mRNA and is downregulated during activity blockade (TTX+AP5); blocking the miR-92a seed region in GluA1 or overexpressing miR-92a prevents homeostatic scaling up of synaptic GluA1-containing AMPARs.\",\n      \"method\": \"miR-92a 3'UTR reporter assay, TTX/AP5 activity blockade in hippocampal neurons, GluA1 3'UTR seed region deletion, miR-92a overexpression, surface AMPAR expression analysis\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct miRNA-mRNA interaction validated, gain- and loss-of-function for miR-92a, homeostatic scaling functional readout\",\n      \"pmids\": [\"25017011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-501-3p targets the 3'UTR of GluA1 mRNA and suppresses GluA1 expression; miR-501-3p is upregulated in dendrites via NMDAR GluN2A subunit activation, and this upregulation is required for NMDA-induced suppression of GluA1 expression and long-lasting dendritic spine remodeling.\",\n      \"method\": \"Deep sequencing of 3'UTR pulldown miRNAs, 3'UTR luciferase reporter, miR-501-3p overexpression/inhibition, GluN2A-specific NMDAR blockers, spine morphology imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'UTR targeting validated, dendritic local regulation confirmed with NMDAR subunit specificity, single lab\",\n      \"pmids\": [\"25800054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TNF-α–driven TRAF2-TNIK association phosphorylates GluR1 and drives GluR1-containing AMPA receptor trafficking toward the plasma membrane in spinal dorsal horn neurons; Fbxo3-dependent ubiquitination of Fbxl2 regulates TRAF2 levels to modulate this TNIK/GluR1 cascade, contributing to neuropathic allodynia.\",\n      \"method\": \"Spinal nerve ligation model, TNIK-GluR1 co-immunoprecipitation, GluR1 phosphorylation assays, siRNA knockdown of TNIK/Fbxo3, intrathecal drug administration, behavioral allodynia assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP of TNIK-GluR1 complex, RNAi loss-of-function, pharmacological dissection, behavioral readout, single lab\",\n      \"pmids\": [\"26674878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Phosphorylation of GluA1 Ser845 reduces binding of the clathrin adaptor AP2 to GluA1, thereby reducing clathrin-mediated internalization of AMPARs; FRAP experiments show S845 phosphorylation predominantly acts on receptor internalization rather than forward trafficking during synaptic plasticity.\",\n      \"method\": \"FRAP (fluorescence recovery after photobleaching), AP2-GluA1 co-immunoprecipitation, S845 phosphomutants, synaptic plasticity induction (LTP, synaptic upscaling)\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP with phosphomutants, direct AP2 binding assay, two forms of synaptic plasticity tested, single lab\",\n      \"pmids\": [\"34369573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GluR1 AMPA receptor subunit overexpression in spinal motor neurons promotes dendritic arborization and filopodial outgrowth in a manner dependent on the Q/R editing site of GluR1 (which determines Ca2+ permeability); these effects are not blocked by NMDA receptor antagonism, suggesting a GluR1-specific, NMDAR-independent mechanism.\",\n      \"method\": \"Viral overexpression of GluR1 (Q vs R variants) in rat spinal motor neurons, quantitative dendritic morphometry, NMDA receptor blockade\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vivo overexpression with morphometric quantification, Q/R site mechanistic comparison, pharmacological control\",\n      \"pmids\": [\"12223558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GluA1-independent LTP at CA3-CA1 synapses has a more sustained component induced via GluN2B-containing NMDARs, neuronal nitric oxide synthase, and PKC (regulators of GluA2 surface expression); this is distinct from the rapidly decaying GluA1-dependent LTP component.\",\n      \"method\": \"Gria1-/- mice, theta-burst LTP induction, nNOS inhibitors, PKC inhibitors, GluN2B antagonists, hippocampal slice electrophysiology\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus pharmacological epistasis, multiple inhibitors, single lab\",\n      \"pmids\": [\"19302150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPT1C (carnitine palmitoyltransferase 1C) interacts with GluA1 intracellularly and enhances surface expression of GluA1-containing AMPARs; the palmitoylable residue C585 of GluA1 is required for CPT1C-mediated trafficking enhancement, although CPT1C does not alter GluA1 palmitoylation state.\",\n      \"method\": \"Co-immunoprecipitation in heterologous cells, whole-cell patch clamp, surface biotinylation, C585 mutagenesis, co-localization imaging\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP binding, electrophysiology, site-specific mutagenesis, surface expression assay, single lab\",\n      \"pmids\": [\"25698923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"p85S6K isoform (but not p70S6K) is enriched in postsynaptic densities, interacts with GluA1 through SAP97 and AKAP79/150, and directly phosphorylates GluA1 at Ser845, thereby sustaining synaptic GluA1 levels and spine density; p85S6K is decreased in AD brain synaptosomal fractions, and its overexpression rescues synaptic deficits in AD model mice.\",\n      \"method\": \"Subcellular fractionation, Co-IP (p85S6K–GluA1 via SAP97/AKAP79/150), in vitro kinase assay (p85S6K→GluA1 Ser845), in situ proximity ligation assay, knockdown/overexpression in AD mice, behavioral and spine density analyses\",\n      \"journal\": \"Translational neurodegeneration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay identifying phosphorylation site, Co-IP of complex, synaptic localization, functional rescue in disease model, single lab\",\n      \"pmids\": [\"36624510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CXCR2 chemokine receptor co-expressed with GluR1 in HEK cells increases GluR1 apparent affinity for glutamate, channel open probability, and binding site cooperativity upon CXCL2 stimulation; C-terminal deletion of GluR1 abolishes this affinity change, implicating the C-terminus in CXCR2-GluR1 functional coupling.\",\n      \"method\": \"HEK cell co-expression electrophysiology, CXCL2 stimulation, GluR1 C-terminal deletion mutants, spontaneous EPSC recordings in cerebellar neurons\",\n      \"journal\": \"Journal of neuroimmunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, heterologous system, mechanism of coupling not directly determined\",\n      \"pmids\": [\"12161022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"R/G editing in the GluA2R flop isoform accelerates the rate of channel opening and desensitization in GluA1/2R heteromeric channels when GluA1 is in the flop form, but has no effect on channel-closing rate or EC50; GluA1 flip/flop status modulates the impact of GluA2 R/G editing on channel kinetics.\",\n      \"method\": \"Laser-pulse photolysis combined with whole-cell recording, systematic comparison of R/G editing × flip/flop variants in heteromeric GluA1/2R channels\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous kinetic analysis with defined splice/editing variants, but single lab\",\n      \"pmids\": [\"29057893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CREB is required for basal synaptic maintenance of GluA1 within the postsynaptic density and for learning-induced increases in synaptic GluA1 and pSer845-GluA1; dominant-negative CREB reduces GluA1 in PSDs, decreases LTP, increases LTD, and blocks contextual fear conditioning-driven GluA1 trafficking to the PSD.\",\n      \"method\": \"Conditional dominant-negative CREB transgenic mice (CREBS133A), PSD fractionation, Western blotting with phospho-specific antibodies, hippocampal electrophysiology (mEPSC, LTP, LTD), contextual fear conditioning\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function of CREB, biochemical PSD fractionation, electrophysiology, and behavioral assay, single lab\",\n      \"pmids\": [\"23504989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"25-40% of GluR1 (as well as GluR2 and GluR4) protein is located at the plasma membrane in stably transfected BHK cells; the surface-localized fraction corresponds to the fully glycosylated upper band on Western blots, indicating that complete glycosylation is required for GluR subunit trafficking to the cell surface.\",\n      \"method\": \"BS3 crosslinking, surface biotinylation/neutravidin precipitation, [3H]AMPA binding, glycopeptidase F treatment, Western blotting in stably transfected BHK cells\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical surface-labeling methods, enzymatic deglycosylation experiment establishing glycosylation-trafficking link\",\n      \"pmids\": [\"9003049\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GluA1 (GRIA1) encodes a subunit of Ca2+-permeable AMPA-type glutamate receptors whose synaptic trafficking, channel properties, and structural plasticity are controlled by phosphorylation at multiple C-terminal sites (Ser831 by CaMKII/PKC, Ser845 by PKA/cGKII/p85S6K, Ser863 by PAK3, Ser579 by CK2), ubiquitination at Lys868 by Nedd4-1 directing lysosomal sorting, S-nitrosylation at Cys875 linking NMDAR-NO signaling to conductance and endocytosis, and interactions of its C-terminus with 4.1N/actin cytoskeleton, β2AR-stargazin-PSD95 signaling complexes, SAP97, and neuroplastin-65 that collectively regulate surface expression, LTP/LTD induction, and spine structural plasticity; cryo-EM structures reveal that GluA1's sequence-diverse N-terminal domain creates a mobile assembly that governs unique gating kinetics and synaptic anchoring efficiency.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GRIA1 encodes GluA1 (GluR1), a subunit of AMPA-type glutamate receptors whose synaptic abundance, channel behavior, and contribution to bidirectional plasticity are governed by a dense layer of post-translational and trafficking control [#0, #5]. Phosphorylation of the C-terminus at distinct sites integrates multiple kinase pathways: PKA phosphorylates Ser845 to raise channel open probability (reversed by calcineurin) [#2], PKC and CaMKII act at Ser831 to increase single-channel conductance [#11], CK2 modifies Ser579 [#22], and PAK3 phosphorylates the site Ser863 downstream of EphB2–Cdc42 signaling [#12]; Ser845 phosphorylation is required for LTD while either Ser831 or Ser845 supports LTP, and phosphomimetic substitution lowers the LTP induction threshold [#0, #1, #13]. Ser845 phosphorylation controls surface residence largely by reducing GluA1 binding to the AP2 clathrin adaptor, limiting internalization [#29]. Convergent signaling routes feed these modifications, including D1 dopamine receptor/DARPP-32-cAMP/PKA [#4], cGKII binding the GluA1 C-terminus [#6], and a β2-adrenergic receptor complex assembled through stargazin and PSD-95 [#9]. Surface levels are further set by Nedd4-1-mediated ubiquitination at Lys868 directing post-endocytic receptors to lysosomes in a Ca2+/CaMKII-dependent manner [#7, #8], by S-nitrosylation at Cys875 that couples NMDAR-NO signaling to conductance, Ser831 phosphorylation and AP2-dependent endocytosis [#10], and by C-terminal interactions with the 4.1N/actin cytoskeleton [#3]. Beyond ion conduction, the GluA1 C-tail confers a structural plasticity function permitting LTP-associated spine enlargement independent of channel activity [#5], while the amino-terminal domain anchors receptors at the postsynaptic membrane through neuroplastin-65 to sustain LTP [#14]; cryo-EM of GluA1/TARP complexes shows that the sequence-diverse NTD forms a mobile assembly whose anchoring efficiency determines gating kinetics and synaptic signaling strength [#15, #16]. GluA1 expression is additionally tuned at the transcriptional, translational, and mRNA-stability levels by CREB [#36], FUS and FXR2P/FMRP [#23, #24], hnRNP A2/B1-driven IRES translation [#25], and the microRNAs miR-92a and miR-501-3p that regulate homeostatic scaling and activity-dependent spine remodeling [#26, #27].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the enzymatic logic of GluA1 C-terminal phosphorylation: PKA at Ser845 raises channel open probability while a parallel cAMP/PKA pathway downstream of D1/DARPP-32 selectively writes Ser845 in vivo.\",\n      \"evidence\": \"Outside-out patch clamp with purified PKA/calcineurin and S845A/S831A mutants; phospho-specific antibodies in neostriatal slices with DARPP-32 knockout mice\",\n      \"pmids\": [\"10627585\", \"10844017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish which phosphatases reverse Ser845 in vivo beyond calcineurin\", \"Did not separate gating effect from trafficking effect of Ser845\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Linked the GluA1 C-terminus to the actin cytoskeleton, showing surface expression depends on a membrane-proximal 4.1N/4.1G interaction.\",\n      \"evidence\": \"Yeast two-hybrid, in vivo Co-IP, surface biotinylation, and actin disruption in heterologous cells and cortical neurons\",\n      \"pmids\": [\"11050113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how 4.1N binding is regulated during plasticity\", \"Did not connect 4.1N anchoring to specific phosphorylation events\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated in vivo that Ser831/Ser845 phosphorylation is required for bidirectional plasticity and spatial memory, moving these sites from biochemical markers to physiological determinants.\",\n      \"evidence\": \"S831A/S845A double knockin mice with hippocampal LTP/LTD recordings and behavioral memory tasks\",\n      \"pmids\": [\"12628184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the individual contribution of each site\", \"Did not address the channel-versus-trafficking basis of the deficit\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Separated GluA1's structural role from its ion-channel role and identified cGKII as a Ser845 kinase coupling cGMP to surface delivery and LTP.\",\n      \"evidence\": \"Channel-dead and cytosolic C-tail constructs with two-photon spine imaging; cGKII Co-IP, in vitro kinase assay, biotinylation, and LTP recordings\",\n      \"pmids\": [\"18077682\", \"18031684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the PSD effector through which the C-tail drives spine enlargement\", \"Did not establish endogenous cGKII contribution to physiological LTP\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved site-specific division of labor (Ser845 required for LTD, either site sufficient for LTP) and showed receptor-selective PKA action via a β2AR–stargazin–PSD-95 complex.\",\n      \"evidence\": \"Single-site S831A/S845A knockin electrophysiology; Co-IP and interference peptides with EPSC recordings in PFC slices\",\n      \"pmids\": [\"19906877\", \"19942860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how the β2AR complex confines PKA to associated GluA1\", \"Did not address whether other GPCRs use analogous scaffolds\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Nedd4-1 as the E3 ligase that ubiquitinates GluA1 C-terminal lysines after AMPA stimulation to route receptors to lysosomes, defining a degradative trafficking arm.\",\n      \"evidence\": \"Ubiquitination-deficient mutants, Nedd4-1 gain/loss-of-function, live-cell trafficking imaging, AMPA versus NMDA stimulation\",\n      \"pmids\": [\"21148011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not pinpoint the exact lysine at this stage\", \"Did not define deubiquitinase counterpart\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided gain-of-function evidence that S831/S845 phosphorylation is sufficient to lower the LTP threshold, complementing the loss-of-function knockins.\",\n      \"evidence\": \"S831D/S845D phosphomimetic knockin mice with multiple LTP induction protocols and biotinylation\",\n      \"pmids\": [\"21536866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphomimetics do not fully reproduce dynamic phosphorylation\", \"Did not resolve relative contribution of each pseudo-phosphorylated site\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Expanded the modification map: PKC at Ser831 raises conductance, and NMDAR-driven S-nitrosylation at Cys875 couples NO signaling to conductance, Ser831 phosphorylation, and AP2-dependent endocytosis.\",\n      \"evidence\": \"Patch clamp with purified PKC and S831A in GluA1+stargazin; C875 mutagenesis, single-channel recording, AP2 Co-IP, endocytosis assays\",\n      \"pmids\": [\"22373567\", \"23277581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish stoichiometry between nitrosylation and phosphorylation in vivo\", \"Did not identify the nitrosylase/denitrosylase enzymes\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapped activity-dependent ubiquitination to Lys868 on plasma-membrane receptors and identified PAK3 (downstream of EphB2-Cdc42) as a kinase writing the new Ser863 site, broadening the trafficking control network.\",\n      \"evidence\": \"Site mutagenesis with Ca2+ channel/CaMKII inhibitors and endosome assays; in vitro PAK3 kinase assay, EphB2 Co-IP, PAK3 RNAi and inhibition with surface biotinylation\",\n      \"pmids\": [\"25660027\", \"26460013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the E3 ligase acting at Lys868 in this context\", \"Did not define the phosphatase removing Ser863\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established that GluA1 abundance is set translationally and post-transcriptionally by RNA-binding proteins and microRNAs, linking GluA1 expression to homeostatic scaling and neurodevelopmental behavior.\",\n      \"evidence\": \"FUS and FXR2P/FMRP knockdown/knockout with RIP, poly(A) and surface assays, mEPSC, and behavioral rescue; miR-92a 3'UTR reporter and homeostatic scaling assays\",\n      \"pmids\": [\"25968143\", \"26051932\", \"25017011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not integrate these RNA-level controls with synaptic phosphorylation events\", \"Did not establish in vivo hierarchy among the regulators\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined an N-terminal-domain anchoring mechanism via neuroplastin-65 required for LTP maintenance, and refined Ser845's role as predominantly anti-internalization by reducing AP2 binding.\",\n      \"evidence\": \"CRISPR single-neuron AMPAR replacement with GluA1 ATD-Np65 binding assays and LTP; FRAP with S845 phosphomutants and AP2 Co-IP\",\n      \"pmids\": [\"33627404\", \"34369573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how Np65 anchoring is dynamically engaged during plasticity\", \"Did not reconcile structural anchoring with C-tail-driven spine enlargement\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided structural mechanism: cryo-EM of GluA1/TARP complexes showed the mobile sequence-diverse NTD assembly governs gating transitions and that NTD anchoring efficiency dictates synaptic signaling strength.\",\n      \"evidence\": \"Cryo-EM of resting/open/desensitized GluA1/γ3 and GluA1/2-γ8 states with GluA2 F231A mutagenesis and electrophysiology\",\n      \"pmids\": [\"37704721\", \"35136046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not capture phosphorylated or ubiquitinated receptor states structurally\", \"Did not visualize NTD engagement with synaptic adhesion partners such as Np65\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many parallel inputs—C-terminal phosphorylation/ubiquitination/nitrosylation, NTD anchoring, cytoskeletal and scaffold interactions, and RNA-level expression control—are temporally coordinated at a single synapse during plasticity remains unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model linking modification timing to trafficking step\", \"Structural basis of regulated states not determined\", \"In vivo hierarchy among redundant kinases and RNA regulators unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [2, 11, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 6, 7, 9, 37]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [8, 10]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 5, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6, 9, 10]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3, 7, 8, 29, 32]}\n    ],\n    \"complexes\": [\n      \"GluA1-TARP (stargazin/γ3/γ8) AMPA receptor complex\",\n      \"β2AR-stargazin-PSD-95 signaling complex\",\n      \"GluA1-SAP97-AKAP79/150-p85S6K complex\"\n    ],\n    \"partners\": [\n      \"DLG4\",\n      \"CACNG2\",\n      \"NEDD4\",\n      \"AP2\",\n      \"EPB41L1\",\n      \"NPTN\",\n      \"PRKG2\",\n      \"DLG1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}