{"gene":"SHANK1","run_date":"2026-06-10T07:46:31","timeline":{"discoveries":[{"year":1999,"finding":"Synamon (SHANK1) was identified as a novel neuronal protein that interacts with GKAP/SAPAP/DAP via its PDZ domain (middle region). It was co-immunoprecipitated with SAPAP from rat crude synaptosomes and co-localized with SAPAP in cultured rat hippocampal neurons, placing it in the PSD scaffold complex.","method":"Yeast two-hybrid screening, co-immunoprecipitation from rat synaptosomes, co-localization in primary cultured neurons","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP from brain tissue plus co-localization, single lab but multiple orthogonal methods","pmids":["10488079"],"is_preprint":false},{"year":2000,"finding":"The PDZ domain of SHANK1 (ProSAP/SSTRIP) directly interacts with the C-termini of CIRL1 and CIRL2 (calcium-independent receptors for alpha-latrotoxin) in vitro; in vivo, only CIRL1 (not CIRL2) was co-immunoprecipitated with ProSAP1 from solubilized rat brain membranes. Both proteins are enriched in the postsynaptic density fraction.","method":"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation from rat brain membrane fractions, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by in vitro binding and co-IP from native brain tissue, multiple orthogonal methods","pmids":["10964907"],"is_preprint":false},{"year":2002,"finding":"The PDZ domain of Shank1 from rat brain was crystallized (peptide-free at 1.8 Å and in complex with the C-terminal octapeptide of GKAP at 3.2 Å resolution), establishing the structural basis for GKAP binding via the PDZ domain.","method":"X-ray crystallography","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure obtained but functional validation not described in this preliminary report; single lab, crystallography only","pmids":["12136153"],"is_preprint":false},{"year":2002,"finding":"The proline-rich region of Shank1 (residues 911–940) interacts with the SH3 domain of IRSp53 via overlay assay. IRSp53 co-precipitates with Shank1 from transfected HEK cells in a cdc42-regulated manner, linking Shank1 to the small G-protein cdc42 pathway. Co-expression of Shank1 with IRSp53 prevents IRSp53 targeting to filopodia.","method":"Yeast two-hybrid, overlay assay, co-immunoprecipitation from HEK293 cells, co-expression/localization assay","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal binding methods (overlay + Co-IP) plus functional co-localization experiment, single lab","pmids":["12504591"],"is_preprint":false},{"year":2004,"finding":"A 200-nucleotide dendritic targeting element (DTE) in the 3′ UTR of Shank1 mRNA was identified by reporter assays in hippocampal neurons; Shank1 and Shank3 (but not Shank2) mRNAs are present in the molecular layers of the hippocampus consistent with dendritic localization, and Shank1/Shank2 transcripts are in dendritic fields of Purkinje cells.","method":"In situ hybridization, reporter transcript expression in hippocampal neurons","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct reporter assay identified functional DTE; complemented by in situ hybridization, single lab","pmids":["15121189"],"is_preprint":false},{"year":2008,"finding":"Shank1 knockout mice show altered PSD protein composition, reduced dendritic spine size, smaller and thinner PSDs, and weaker basal synaptic transmission, establishing that Shank1 is required for normal synapse structure and synaptic strength in vivo.","method":"Genetic knockout (Shank1−/−), electron microscopy of PSD, electrophysiology, immunoblot of PSD fractions","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple defined cellular phenotypes (ultrastructure, PSD composition, electrophysiology), replicated across multiple measures","pmids":["18272690"],"is_preprint":false},{"year":2009,"finding":"Shank1 mRNA granules undergo saltatory microtubule-dependent transport in dendrites involving the kinesin motor KIF5C and the KIF5-associated RNA-binding protein staufen1, as shown by dominant-negative interference. Translation of Shank1 mRNA is strongly inhibited by a GC-rich 5′ UTR; internal ribosome entry sites are absent, distinguishing its translational regulation from other dendritic mRNAs.","method":"Live cell imaging, dominant-negative protein expression, co-fractionation of brain mRNPs with KIF5C cargo-binding domain, reporter assays","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus dominant-negative functional assay plus biochemical fractionation, single lab, multiple orthogonal approaches","pmids":["19416473"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the Shank1 PDZ domain in complex with the βPIX C-terminal pentapeptide (DETNL) at 2.3 Å resolution revealed a large hydrophobic pocket accommodating variable P0 residues, an invariant H-bond between His735 and Ser/Thr at P−2, and flexible loops enabling structural plasticity for binding diverse ligands.","method":"X-ray crystallography at 2.3 Å, structural modeling of additional PDZ–peptide complexes","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional modeling, identifies specific binding contacts; single lab but rigorous structural method","pmids":["21376703"],"is_preprint":false},{"year":2014,"finding":"FMRP binds two stable intramolecular G-quadruplex structures in the Shank1 mRNA 3′-UTR with high affinity both in vitro and in vivo; FMRP S500D phospho-mimic also binds these structures, identifying G-quadruplex motifs as structural elements mediating FMRP regulation of Shank1 mRNA.","method":"Biophysical assays (in vitro binding), in vivo interaction assays, G-quadruplex structural analysis","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo binding demonstrated with biophysical techniques, single lab","pmids":["25692235"],"is_preprint":false},{"year":2014,"finding":"Translation of Shank1 mRNA requires a non-canonical ACG start codon upstream of the main ORF: mutation of this ACG nearly abolishes translation initiation at AUG+1, revealing a novel translational control mechanism where a non-canonical uORF is required for Shank1 synthesis despite a highly structured 5′ UTR.","method":"Reporter assays with mutagenesis in heterologous cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis of specific start codon with functional readout, single lab, in vitro reporter system","pmids":["24533096"],"is_preprint":false},{"year":2015,"finding":"Shank1 protein is highly localized in parvalbumin-expressing (PV+) fast-spiking inhibitory interneurons in the hippocampus. Loss of Shank1 in these neurons reduces excitatory synaptic inputs and inhibitory synaptic outputs to pyramidal neurons, and decreases gephyrin expression, shifting the excitatory/inhibitory balance in hippocampal CA1.","method":"Immunofluorescence localization, electrophysiology (miniature EPSCs/IPSCs in Shank1−/− mice), immunoblot for gephyrin","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiment tied to functional consequence (E/I balance shift), multiple electrophysiological and biochemical readouts, single lab","pmids":["25816842"],"is_preprint":false},{"year":2021,"finding":"De novo truncating variants in SHANK1 produce stable transcripts (escaping NMD) but cause complete loss of Homer1 binding (which requires the SHANK1 C-terminus). Truncated SHANK1 expressed in neurons shows dispersed localization in the spine and dendritic shaft rather than normal synaptic targeting, indicating impaired synaptic localization.","method":"Knock-in cell lines for NMD assessment, HEK293 expression, hippocampal neuron expression/immunofluorescence localization","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional assays for NMD, binding, and synaptic localization in neurons; single lab, multiple orthogonal methods","pmids":["34113010"],"is_preprint":false},{"year":2022,"finding":"A recurrent ASD missense mutation R874H in Shank1 causes downregulation of mGluR1-IP3R1-calcium signaling in frontal cortex, hippocampus, and cerebellar cortex in knock-in mice, with accompanying decreased spine size, reduced spine density, abnormal PSD morphology, and impaired hippocampal LTP and basal excitatory transmission.","method":"Knock-in mouse model, structural MRI, electrophysiology (LTP, basal excitatory transmission), electron microscopy (spine/PSD morphology), western blot for mGluR1/IP3R1/calcium signaling pathway components","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, ultrastructure, molecular pathway analysis) in a single rigorous KI study; pathway mechanism identified","pmids":["35388181"],"is_preprint":false},{"year":2022,"finding":"SHANK1 interacts with the E3 ubiquitin ligase MDM2 and the tumor suppressor Klotho, forming a ternary complex that enhances MDM2-mediated ubiquitination and proteasomal degradation of Klotho in non-small cell lung cancer cells.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown in NSCLC cells, mouse xenograft model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating ternary complex, direct ubiquitination assay, single lab","pmids":["35468874"],"is_preprint":false},{"year":2023,"finding":"A second ASD-associated Shank1 knock-in mutation (P1812L) also causes downregulation of mGluR1 signaling and dendritic spine structural abnormalities, corroborating that mGluR1-mediated signaling dysfunction is a convergent mechanism in Shank1-related ASD pathology.","method":"Knock-in mouse model, electrophysiology, western blot for mGluR1 and associated signals, electron microscopy of dendritic spines/PSDs","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — independent KI model replicating mGluR1 pathway finding from PMID 35388181, multiple methods, single lab","pmids":["37880287"],"is_preprint":false},{"year":2024,"finding":"X-ray co-crystal structure of the SHANK1 PDZ domain with an internal short linear motif (SLiM) peptide Ac-EESTSFQGP-CONH2 at atomic resolution revealed that the PDZ backbone adopts an orientation overlapping with canonical C-terminal PBM binding, with flexible loops reorganizing to accommodate the internal ligand; the terminal Gly and Pro residues do not participate in contact with the domain.","method":"X-ray crystallography, fluorescence anisotropy competition assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with binding affinity measured by fluorescence anisotropy; two ligand complexes structurally compared, single lab","pmids":["38899489"],"is_preprint":false},{"year":2025,"finding":"USP18 deubiquitinates SHANK1 and stabilizes its protein expression in paclitaxel-resistant NSCLC cells; Co-IP validated the USP18–SHANK1 interaction, and silencing USP18 reduced SHANK1 levels, promoted paclitaxel sensitivity, suppressed glycolysis, and induced apoptosis, while SHANK1 overexpression reversed these effects.","method":"Co-immunoprecipitation, cellular ubiquitination assay, siRNA knockdown, overexpression rescue, in vivo xenograft","journal":"Journal of biochemical and molecular toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus direct ubiquitination assay establishing deubiquitinase-substrate relationship, single lab","pmids":["40096187"],"is_preprint":false},{"year":2025,"finding":"PKA/CREB signaling controls SHANK1 transcription: pharmacological inhibition of PKA/CREB reduces SHANK1 expression and impairs dendritic structure and synaptic function; PKA activation restores CREB activity and SHANK1 levels. A CREB S133A mutant blocks PKA-induced SHANK1 upregulation, while constitutively active CREB S133D prevents SHANK1 downregulation, demonstrating CREB is essential for SHANK1 regulation.","method":"Pharmacological PKA inhibition/activation, CREB mutagenesis (S133A/S133D), RNA sequencing, western blot, dendritic morphology analysis, electrophysiology in rat hippocampus","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis of CREB phosphorylation site with functional readout for SHANK1 expression, plus pharmacological validation, single lab","pmids":["40574425"],"is_preprint":false},{"year":2025,"finding":"EZH2 epigenetically silences SHANK1 via H3K27 trimethylation at its promoter in glioblastoma stem cells; pharmacological or genetic EZH2 inhibition restores SHANK1 expression. SHANK1 overexpression inhibits Wnt/β-catenin signaling by reducing β-catenin levels, impairing GSC self-renewal and tumor growth.","method":"ChIP for H3K27me3 at SHANK1 promoter, EZH2 inhibition (pharmacological and genetic), SHANK1 overexpression, β-catenin reporter/western blot, in vivo tumor growth assay, multiplex immunofluorescence of GBM tissue","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes epigenetic mechanism, functional rescue with multiple orthogonal readouts, single lab","pmids":["41274253"],"is_preprint":false},{"year":2025,"finding":"Disease-associated missense mutations in the Shank1 PDZ domain generally weaken binding to partner peptides in a partner-specific manner dependent on dynamic rearrangements; notably the R736Q mutant has increased thermal stability and binds the GKAP peptide with higher affinity than wild type, demonstrating that mutation effects on ligand binding are highly context-dependent.","method":"Experimental binding assays (fluorescence anisotropy), thermal stability measurements, molecular dynamics simulations","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — biophysical binding assays with MD simulations, preprint, single lab","pmids":[],"is_preprint":true}],"current_model":"SHANK1 encodes a multidomain postsynaptic scaffold protein that anchors PSD complexes by binding GKAP/SAPAP via its PDZ domain, connects to signaling networks through its proline-rich region (via IRSp53/cdc42) and SAM domain (Homer1), undergoes kinesin KIF5C/staufen1-dependent dendritic mRNA transport with translational control by a GC-rich 5′ UTR and a non-canonical ACG uORF, and is required in vivo for normal dendritic spine morphology, PSD composition, and excitatory synaptic strength—with loss of function shifting excitatory/inhibitory balance particularly through effects on parvalbumin interneurons—while ASD-associated missense mutations converge on downregulation of mGluR1-IP3R1-calcium signaling; outside the nervous system, SHANK1 protein stability is regulated by USP18-mediated deubiquitination and EZH2-mediated epigenetic silencing, and it participates in MDM2-dependent ubiquitination of Klotho."},"narrative":{"mechanistic_narrative":"SHANK1 is a multidomain postsynaptic density scaffold protein that organizes excitatory synapses and is required in vivo for normal dendritic spine morphology, PSD ultrastructure, and basal synaptic strength [PMID:10488079, PMID:18272690]. It nucleates the PSD complex through its central PDZ domain, which binds the C-termini of GKAP/SAPAP and other partners including CIRL1 and βPIX; crystallographic work defines a plastic hydrophobic pocket with flexible loops that accommodate diverse C-terminal and internal short linear motifs [PMID:10488079, PMID:10964907, PMID:12136153, PMID:21376703, PMID:38899489]. Its proline-rich region links the scaffold to actin-regulatory and small-GTPase signaling by binding the SH3 domain of IRSp53 in a cdc42-regulated manner, while the C-terminus mediates synaptic targeting and Homer1 binding [PMID:12504591, PMID:34113010]. SHANK1 expression is controlled at multiple levels: its mRNA is transported into dendrites along microtubules via KIF5C/staufen1 and translated under tight control by a GC-rich 5′ UTR, a non-canonical ACG uORF, and FMRP-bound 3′ UTR G-quadruplexes, with a defined dendritic targeting element directing localization [PMID:15121189, PMID:19416473, PMID:25692235, PMID:24533096], and its transcription is driven by PKA/CREB signaling [PMID:40574425]. Functionally, SHANK1 is enriched in parvalbumin-positive interneurons where its loss shifts the hippocampal excitatory/inhibitory balance [PMID:25816842], and ASD-associated missense mutations (R874H, P1812L) converge on downregulation of mGluR1–IP3R1–calcium signaling with spine and LTP deficits, while truncating variants abolish Homer1 binding and synaptic targeting, establishing SHANK1 as a gene linked to autism spectrum disorder [PMID:34113010, PMID:35388181, PMID:37880287]. Outside the nervous system, SHANK1 stability and expression are regulated by USP18-mediated deubiquitination and EZH2-mediated H3K27me3 silencing, and it scaffolds MDM2-dependent ubiquitination of Klotho in lung cancer cells [PMID:35468874, PMID:40096187, PMID:41274253].","teleology":[{"year":1999,"claim":"Establishing that SHANK1 is a PSD scaffold answered where this neuronal protein acts by placing it in the postsynaptic density via direct PDZ-domain binding to GKAP/SAPAP.","evidence":"Yeast two-hybrid, reciprocal Co-IP from rat synaptosomes, co-localization in hippocampal neurons","pmids":["10488079"],"confidence":"High","gaps":["Did not define structural basis of PDZ binding","Did not establish in vivo requirement for synapse function"]},{"year":2000,"claim":"Identifying CIRL1 as a brain-validated PDZ ligand broadened the scaffold's repertoire of receptor partners at the PSD beyond GKAP.","evidence":"Yeast two-hybrid, in vitro binding, Co-IP from rat brain membranes, subcellular fractionation","pmids":["10964907"],"confidence":"High","gaps":["Functional consequence of CIRL1 anchoring not defined","CIRL2 bound in vitro but not in vivo, leaving selectivity unexplained"]},{"year":2002,"claim":"The PDZ–GKAP co-crystal structure answered how SHANK1 recognizes its scaffold ligands at atomic resolution.","evidence":"X-ray crystallography of peptide-free and GKAP-bound PDZ domain","pmids":["12136153"],"confidence":"Medium","gaps":["No functional validation in this report","Single ligand complex did not address binding plasticity"]},{"year":2002,"claim":"Mapping the IRSp53 interaction to the proline-rich region connected the scaffold to cdc42/actin-based filopodial signaling, explaining how SHANK1 could couple the PSD to cytoskeletal remodeling.","evidence":"Overlay assay, Co-IP from HEK293 cells, co-expression/localization in transfected cells","pmids":["12504591"],"confidence":"Medium","gaps":["Shown in heterologous cells, not native synapses","Downstream actin effects on spine shape not directly measured"]},{"year":2004,"claim":"Identifying a 3′ UTR dendritic targeting element answered how SHANK1 mRNA reaches dendrites for local availability.","evidence":"Reporter transcript assays and in situ hybridization in hippocampal/cerebellar neurons","pmids":["15121189"],"confidence":"Medium","gaps":["Did not identify the trans-acting transport machinery","Did not address translational regulation"]},{"year":2008,"claim":"The knockout established the in vivo requirement for SHANK1, moving it from a binding partner to a determinant of spine size, PSD composition, and synaptic strength.","evidence":"Shank1−/− mice with EM, electrophysiology, and PSD immunoblotting","pmids":["18272690"],"confidence":"High","gaps":["Cell types responsible for phenotype not resolved","Did not separate scaffolding from signaling contributions"]},{"year":2009,"claim":"Defining KIF5C/staufen1-dependent transport and GC-rich 5′ UTR repression answered how SHANK1 mRNA is moved and held translationally silent in dendrites.","evidence":"Live imaging, dominant-negative interference, brain mRNP co-fractionation, reporter assays","pmids":["19416473"],"confidence":"Medium","gaps":["Signal that derepresses translation locally not identified","IRES-independence left activation mechanism open"]},{"year":2014,"claim":"Discovery of an ACG uORF and FMRP-bound G-quadruplexes resolved how SHANK1 is translated despite a highly structured 5′ UTR and how FMRP regulates it via 3′ UTR structures.","evidence":"Reporter mutagenesis of the ACG codon; biophysical and in vivo FMRP–G-quadruplex binding assays","pmids":["24533096","25692235"],"confidence":"Medium","gaps":["Physiological stimuli engaging the uORF not defined","Functional outcome of FMRP regulation on synaptic SHANK1 not quantified"]},{"year":2011,"claim":"The PDZ–βPIX structure revealed the plasticity that lets one domain bind diverse ligands, explaining the scaffold's promiscuity.","evidence":"X-ray crystallography at 2.3 Å plus modeling of additional PDZ–peptide complexes","pmids":["21376703"],"confidence":"High","gaps":["Did not test binding hierarchy among competing ligands","No mutational test of identified contacts in cells"]},{"year":2015,"claim":"Localizing SHANK1 to parvalbumin interneurons answered which circuit element drives the knockout phenotype, linking loss to an excitatory/inhibitory imbalance.","evidence":"Immunofluorescence, mEPSC/mIPSC recordings in Shank1−/− mice, gephyrin immunoblot","pmids":["25816842"],"confidence":"High","gaps":["Mechanism linking SHANK1 loss to reduced gephyrin not defined","Behavioral consequence of E/I shift not assessed here"]},{"year":2021,"claim":"Truncating variant analysis answered why human mutations are pathogenic: stable truncated protein loses Homer1 binding and fails to localize to synapses.","evidence":"NMD knock-in lines, HEK293 binding assays, neuronal localization imaging","pmids":["34113010"],"confidence":"Medium","gaps":["Synaptic functional deficit of mislocalized protein not measured","Dominant vs loss-of-function mechanism not resolved"]},{"year":2022,"claim":"ASD missense knock-in models identified mGluR1–IP3R1–calcium signaling downregulation as the convergent pathological mechanism, with subsequent independent confirmation.","evidence":"R874H and P1812L knock-in mice with electrophysiology, EM, and pathway immunoblotting","pmids":["35388181","37880287"],"confidence":"High","gaps":["Molecular link from SHANK1 to mGluR1 signaling not biochemically mapped","Whether scaffolding loss or gain drives the deficit unresolved"]},{"year":2022,"claim":"Identification of a SHANK1–MDM2–Klotho ternary complex revealed a non-neuronal role for SHANK1 in scaffolding ubiquitination of a tumor suppressor.","evidence":"Co-IP, ubiquitination assay, knockdown/overexpression in NSCLC cells, xenograft","pmids":["35468874"],"confidence":"Medium","gaps":["Direct vs bridged interactions within the complex not separated","Domain of SHANK1 mediating MDM2/Klotho binding not mapped"]},{"year":2025,"claim":"USP18 deubiquitination and EZH2/H3K27me3 silencing answered how SHANK1 protein and transcript levels are set in cancer, with functional consequences for drug resistance and Wnt signaling.","evidence":"Co-IP and ubiquitination assays for USP18; promoter ChIP and rescue for EZH2; β-catenin and tumor growth readouts","pmids":["40096187","41274253"],"confidence":"Medium","gaps":["How SHANK1 suppresses Wnt/β-catenin mechanistically not defined","Relationship between cancer and neuronal SHANK1 functions unclear"]},{"year":2025,"claim":"PKA/CREB was shown to control SHANK1 transcription, defining an upstream signaling input that couples activity to scaffold abundance and synaptic function.","evidence":"PKA modulation, CREB S133A/S133D mutagenesis, RNA-seq, dendritic morphology and electrophysiology in rat hippocampus","pmids":["40574425"],"confidence":"Medium","gaps":["Whether CREB binds the SHANK1 promoter directly not shown","Physiological stimuli driving this axis not identified"]},{"year":null,"claim":"How SHANK1 mechanistically links its scaffold to mGluR1 signaling, and how local translational and transcriptional controls are integrated by synaptic activity in vivo, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No biochemical bridge from SHANK1 to mGluR1/IP3R1 mapped","Activity-dependent coupling of transport, uORF, and PKA/CREB control not integrated","Unified explanation for neuronal vs oncogenic roles absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,3,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[3]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,10,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,12]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[6,8,9]}],"complexes":["postsynaptic density (PSD)","SHANK1-MDM2-Klotho ternary complex"],"partners":["GKAP/SAPAP","CIRL1","IRSP53","HOMER1","BETAPIX","FMRP","MDM2","USP18"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y566","full_name":"SH3 and multiple ankyrin repeat domains protein 1","aliases":["Somatostatin receptor-interacting protein","SSTR-interacting protein","SSTRIP"],"length_aa":2161,"mass_kda":225.0,"function":"Seems to be an adapter protein in the postsynaptic density (PSD) of excitatory synapses that interconnects receptors of the postsynaptic membrane including NMDA-type and metabotropic glutamate receptors via complexes with GKAP/PSD-95 and Homer, respectively, and the actin-based cytoskeleton. Plays a role in the structural and functional organization of the dendritic spine and synaptic junction","subcellular_location":"Cytoplasm; Postsynaptic density; Synapse","url":"https://www.uniprot.org/uniprotkb/Q9Y566/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SHANK1","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/SHANK1","total_profiled":1310},"omim":[{"mim_id":"604999","title":"SH3 AND MULTIPLE ANKYRIN REPEAT DOMAINS 1; SHANK1","url":"https://www.omim.org/entry/604999"},{"mim_id":"604800","title":"HOMER SCAFFOLD PROTEIN 3; HOMER3","url":"https://www.omim.org/entry/604800"},{"mim_id":"604798","title":"HOMER SCAFFOLD PROTEIN 1; HOMER1","url":"https://www.omim.org/entry/604798"},{"mim_id":"600568","title":"NEUROLIGIN 1; NLGN1","url":"https://www.omim.org/entry/600568"},{"mim_id":"209850","title":"AUTISM","url":"https://www.omim.org/entry/209850"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":60.6}],"url":"https://www.proteinatlas.org/search/SHANK1"},"hgnc":{"alias_symbol":["SSTRIP","SPANK-1","synamon"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y566","domains":[{"cath_id":"3.10.20.90","chopping":"71-158","consensus_level":"medium","plddt":86.5935,"start":71,"end":158},{"cath_id":"2.30.30.40","chopping":"574-606","consensus_level":"medium","plddt":85.4721,"start":574,"end":606},{"cath_id":"2.30.42.10","chopping":"658-759","consensus_level":"high","plddt":86.1864,"start":658,"end":759},{"cath_id":"1.10.150.50","chopping":"2084-2161","consensus_level":"medium","plddt":86.1736,"start":2084,"end":2161}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y566","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y566-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y566-F1-predicted_aligned_error_v6.png","plddt_mean":47.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SHANK1","jax_strain_url":"https://www.jax.org/strain/search?query=SHANK1"},"sequence":{"accession":"Q9Y566","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y566.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y566/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y566"}},"corpus_meta":[{"pmid":"18272690","id":"PMC_18272690","title":"Smaller dendritic spines, weaker synaptic transmission, but enhanced spatial learning in mice lacking Shank1.","date":"2008","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18272690","citation_count":291,"is_preprint":false},{"pmid":"22503632","id":"PMC_22503632","title":"SHANK1 Deletions in Males with Autism Spectrum Disorder.","date":"2012","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22503632","citation_count":262,"is_preprint":false},{"pmid":"21695253","id":"PMC_21695253","title":"Communication impairments in mice lacking Shank1: reduced levels of ultrasonic vocalizations and scent marking behavior.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21695253","citation_count":168,"is_preprint":false},{"pmid":"15121189","id":"PMC_15121189","title":"Differential expression and dendritic transcript localization of Shank family members: identification of a dendritic targeting element in the 3' untranslated region of Shank1 mRNA.","date":"2004","source":"Molecular and cellular neurosciences","url":"https://pubmed.ncbi.nlm.nih.gov/15121189","citation_count":113,"is_preprint":false},{"pmid":"10488079","id":"PMC_10488079","title":"Synamon, a novel neuronal protein interacting with synapse-associated protein 90/postsynaptic density-95-associated protein.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10488079","citation_count":79,"is_preprint":false},{"pmid":"10964907","id":"PMC_10964907","title":"The calcium-independent receptor for alpha-latrotoxin from human and rodent brains interacts with members of the ProSAP/SSTRIP/Shank family of multidomain proteins.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10964907","citation_count":77,"is_preprint":false},{"pmid":"12504591","id":"PMC_12504591","title":"The insulin 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It was co-immunoprecipitated with SAPAP from rat crude synaptosomes and co-localized with SAPAP in cultured rat hippocampal neurons, placing it in the PSD scaffold complex.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation from rat synaptosomes, co-localization in primary cultured neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP from brain tissue plus co-localization, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"10488079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The PDZ domain of SHANK1 (ProSAP/SSTRIP) directly interacts with the C-termini of CIRL1 and CIRL2 (calcium-independent receptors for alpha-latrotoxin) in vitro; in vivo, only CIRL1 (not CIRL2) was co-immunoprecipitated with ProSAP1 from solubilized rat brain membranes. Both proteins are enriched in the postsynaptic density fraction.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation from rat brain membrane fractions, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by in vitro binding and co-IP from native brain tissue, multiple orthogonal methods\",\n      \"pmids\": [\"10964907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The PDZ domain of Shank1 from rat brain was crystallized (peptide-free at 1.8 Å and in complex with the C-terminal octapeptide of GKAP at 3.2 Å resolution), establishing the structural basis for GKAP binding via the PDZ domain.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure obtained but functional validation not described in this preliminary report; single lab, crystallography only\",\n      \"pmids\": [\"12136153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The proline-rich region of Shank1 (residues 911–940) interacts with the SH3 domain of IRSp53 via overlay assay. IRSp53 co-precipitates with Shank1 from transfected HEK cells in a cdc42-regulated manner, linking Shank1 to the small G-protein cdc42 pathway. Co-expression of Shank1 with IRSp53 prevents IRSp53 targeting to filopodia.\",\n      \"method\": \"Yeast two-hybrid, overlay assay, co-immunoprecipitation from HEK293 cells, co-expression/localization assay\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal binding methods (overlay + Co-IP) plus functional co-localization experiment, single lab\",\n      \"pmids\": [\"12504591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A 200-nucleotide dendritic targeting element (DTE) in the 3′ UTR of Shank1 mRNA was identified by reporter assays in hippocampal neurons; Shank1 and Shank3 (but not Shank2) mRNAs are present in the molecular layers of the hippocampus consistent with dendritic localization, and Shank1/Shank2 transcripts are in dendritic fields of Purkinje cells.\",\n      \"method\": \"In situ hybridization, reporter transcript expression in hippocampal neurons\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct reporter assay identified functional DTE; complemented by in situ hybridization, single lab\",\n      \"pmids\": [\"15121189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Shank1 knockout mice show altered PSD protein composition, reduced dendritic spine size, smaller and thinner PSDs, and weaker basal synaptic transmission, establishing that Shank1 is required for normal synapse structure and synaptic strength in vivo.\",\n      \"method\": \"Genetic knockout (Shank1−/−), electron microscopy of PSD, electrophysiology, immunoblot of PSD fractions\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple defined cellular phenotypes (ultrastructure, PSD composition, electrophysiology), replicated across multiple measures\",\n      \"pmids\": [\"18272690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Shank1 mRNA granules undergo saltatory microtubule-dependent transport in dendrites involving the kinesin motor KIF5C and the KIF5-associated RNA-binding protein staufen1, as shown by dominant-negative interference. Translation of Shank1 mRNA is strongly inhibited by a GC-rich 5′ UTR; internal ribosome entry sites are absent, distinguishing its translational regulation from other dendritic mRNAs.\",\n      \"method\": \"Live cell imaging, dominant-negative protein expression, co-fractionation of brain mRNPs with KIF5C cargo-binding domain, reporter assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus dominant-negative functional assay plus biochemical fractionation, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"19416473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the Shank1 PDZ domain in complex with the βPIX C-terminal pentapeptide (DETNL) at 2.3 Å resolution revealed a large hydrophobic pocket accommodating variable P0 residues, an invariant H-bond between His735 and Ser/Thr at P−2, and flexible loops enabling structural plasticity for binding diverse ligands.\",\n      \"method\": \"X-ray crystallography at 2.3 Å, structural modeling of additional PDZ–peptide complexes\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional modeling, identifies specific binding contacts; single lab but rigorous structural method\",\n      \"pmids\": [\"21376703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FMRP binds two stable intramolecular G-quadruplex structures in the Shank1 mRNA 3′-UTR with high affinity both in vitro and in vivo; FMRP S500D phospho-mimic also binds these structures, identifying G-quadruplex motifs as structural elements mediating FMRP regulation of Shank1 mRNA.\",\n      \"method\": \"Biophysical assays (in vitro binding), in vivo interaction assays, G-quadruplex structural analysis\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo binding demonstrated with biophysical techniques, single lab\",\n      \"pmids\": [\"25692235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Translation of Shank1 mRNA requires a non-canonical ACG start codon upstream of the main ORF: mutation of this ACG nearly abolishes translation initiation at AUG+1, revealing a novel translational control mechanism where a non-canonical uORF is required for Shank1 synthesis despite a highly structured 5′ UTR.\",\n      \"method\": \"Reporter assays with mutagenesis in heterologous cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of specific start codon with functional readout, single lab, in vitro reporter system\",\n      \"pmids\": [\"24533096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Shank1 protein is highly localized in parvalbumin-expressing (PV+) fast-spiking inhibitory interneurons in the hippocampus. Loss of Shank1 in these neurons reduces excitatory synaptic inputs and inhibitory synaptic outputs to pyramidal neurons, and decreases gephyrin expression, shifting the excitatory/inhibitory balance in hippocampal CA1.\",\n      \"method\": \"Immunofluorescence localization, electrophysiology (miniature EPSCs/IPSCs in Shank1−/− mice), immunoblot for gephyrin\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment tied to functional consequence (E/I balance shift), multiple electrophysiological and biochemical readouts, single lab\",\n      \"pmids\": [\"25816842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"De novo truncating variants in SHANK1 produce stable transcripts (escaping NMD) but cause complete loss of Homer1 binding (which requires the SHANK1 C-terminus). Truncated SHANK1 expressed in neurons shows dispersed localization in the spine and dendritic shaft rather than normal synaptic targeting, indicating impaired synaptic localization.\",\n      \"method\": \"Knock-in cell lines for NMD assessment, HEK293 expression, hippocampal neuron expression/immunofluorescence localization\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional assays for NMD, binding, and synaptic localization in neurons; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"34113010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A recurrent ASD missense mutation R874H in Shank1 causes downregulation of mGluR1-IP3R1-calcium signaling in frontal cortex, hippocampus, and cerebellar cortex in knock-in mice, with accompanying decreased spine size, reduced spine density, abnormal PSD morphology, and impaired hippocampal LTP and basal excitatory transmission.\",\n      \"method\": \"Knock-in mouse model, structural MRI, electrophysiology (LTP, basal excitatory transmission), electron microscopy (spine/PSD morphology), western blot for mGluR1/IP3R1/calcium signaling pathway components\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, ultrastructure, molecular pathway analysis) in a single rigorous KI study; pathway mechanism identified\",\n      \"pmids\": [\"35388181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SHANK1 interacts with the E3 ubiquitin ligase MDM2 and the tumor suppressor Klotho, forming a ternary complex that enhances MDM2-mediated ubiquitination and proteasomal degradation of Klotho in non-small cell lung cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown in NSCLC cells, mouse xenograft model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating ternary complex, direct ubiquitination assay, single lab\",\n      \"pmids\": [\"35468874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A second ASD-associated Shank1 knock-in mutation (P1812L) also causes downregulation of mGluR1 signaling and dendritic spine structural abnormalities, corroborating that mGluR1-mediated signaling dysfunction is a convergent mechanism in Shank1-related ASD pathology.\",\n      \"method\": \"Knock-in mouse model, electrophysiology, western blot for mGluR1 and associated signals, electron microscopy of dendritic spines/PSDs\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — independent KI model replicating mGluR1 pathway finding from PMID 35388181, multiple methods, single lab\",\n      \"pmids\": [\"37880287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"X-ray co-crystal structure of the SHANK1 PDZ domain with an internal short linear motif (SLiM) peptide Ac-EESTSFQGP-CONH2 at atomic resolution revealed that the PDZ backbone adopts an orientation overlapping with canonical C-terminal PBM binding, with flexible loops reorganizing to accommodate the internal ligand; the terminal Gly and Pro residues do not participate in contact with the domain.\",\n      \"method\": \"X-ray crystallography, fluorescence anisotropy competition assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with binding affinity measured by fluorescence anisotropy; two ligand complexes structurally compared, single lab\",\n      \"pmids\": [\"38899489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP18 deubiquitinates SHANK1 and stabilizes its protein expression in paclitaxel-resistant NSCLC cells; Co-IP validated the USP18–SHANK1 interaction, and silencing USP18 reduced SHANK1 levels, promoted paclitaxel sensitivity, suppressed glycolysis, and induced apoptosis, while SHANK1 overexpression reversed these effects.\",\n      \"method\": \"Co-immunoprecipitation, cellular ubiquitination assay, siRNA knockdown, overexpression rescue, in vivo xenograft\",\n      \"journal\": \"Journal of biochemical and molecular toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus direct ubiquitination assay establishing deubiquitinase-substrate relationship, single lab\",\n      \"pmids\": [\"40096187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PKA/CREB signaling controls SHANK1 transcription: pharmacological inhibition of PKA/CREB reduces SHANK1 expression and impairs dendritic structure and synaptic function; PKA activation restores CREB activity and SHANK1 levels. A CREB S133A mutant blocks PKA-induced SHANK1 upregulation, while constitutively active CREB S133D prevents SHANK1 downregulation, demonstrating CREB is essential for SHANK1 regulation.\",\n      \"method\": \"Pharmacological PKA inhibition/activation, CREB mutagenesis (S133A/S133D), RNA sequencing, western blot, dendritic morphology analysis, electrophysiology in rat hippocampus\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis of CREB phosphorylation site with functional readout for SHANK1 expression, plus pharmacological validation, single lab\",\n      \"pmids\": [\"40574425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"EZH2 epigenetically silences SHANK1 via H3K27 trimethylation at its promoter in glioblastoma stem cells; pharmacological or genetic EZH2 inhibition restores SHANK1 expression. SHANK1 overexpression inhibits Wnt/β-catenin signaling by reducing β-catenin levels, impairing GSC self-renewal and tumor growth.\",\n      \"method\": \"ChIP for H3K27me3 at SHANK1 promoter, EZH2 inhibition (pharmacological and genetic), SHANK1 overexpression, β-catenin reporter/western blot, in vivo tumor growth assay, multiplex immunofluorescence of GBM tissue\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes epigenetic mechanism, functional rescue with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"41274253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Disease-associated missense mutations in the Shank1 PDZ domain generally weaken binding to partner peptides in a partner-specific manner dependent on dynamic rearrangements; notably the R736Q mutant has increased thermal stability and binds the GKAP peptide with higher affinity than wild type, demonstrating that mutation effects on ligand binding are highly context-dependent.\",\n      \"method\": \"Experimental binding assays (fluorescence anisotropy), thermal stability measurements, molecular dynamics simulations\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — biophysical binding assays with MD simulations, preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SHANK1 encodes a multidomain postsynaptic scaffold protein that anchors PSD complexes by binding GKAP/SAPAP via its PDZ domain, connects to signaling networks through its proline-rich region (via IRSp53/cdc42) and SAM domain (Homer1), undergoes kinesin KIF5C/staufen1-dependent dendritic mRNA transport with translational control by a GC-rich 5′ UTR and a non-canonical ACG uORF, and is required in vivo for normal dendritic spine morphology, PSD composition, and excitatory synaptic strength—with loss of function shifting excitatory/inhibitory balance particularly through effects on parvalbumin interneurons—while ASD-associated missense mutations converge on downregulation of mGluR1-IP3R1-calcium signaling; outside the nervous system, SHANK1 protein stability is regulated by USP18-mediated deubiquitination and EZH2-mediated epigenetic silencing, and it participates in MDM2-dependent ubiquitination of Klotho.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SHANK1 is a multidomain postsynaptic density scaffold protein that organizes excitatory synapses and is required in vivo for normal dendritic spine morphology, PSD ultrastructure, and basal synaptic strength [#0, #5]. It nucleates the PSD complex through its central PDZ domain, which binds the C-termini of GKAP/SAPAP and other partners including CIRL1 and \\u03b2PIX; crystallographic work defines a plastic hydrophobic pocket with flexible loops that accommodate diverse C-terminal and internal short linear motifs [#0, #1, #2, #7, #15]. Its proline-rich region links the scaffold to actin-regulatory and small-GTPase signaling by binding the SH3 domain of IRSp53 in a cdc42-regulated manner, while the C-terminus mediates synaptic targeting and Homer1 binding [#3, #11]. SHANK1 expression is controlled at multiple levels: its mRNA is transported into dendrites along microtubules via KIF5C/staufen1 and translated under tight control by a GC-rich 5\\u2032 UTR, a non-canonical ACG uORF, and FMRP-bound 3\\u2032 UTR G-quadruplexes, with a defined dendritic targeting element directing localization [#4, #6, #8, #9], and its transcription is driven by PKA/CREB signaling [#17]. Functionally, SHANK1 is enriched in parvalbumin-positive interneurons where its loss shifts the hippocampal excitatory/inhibitory balance [#10], and ASD-associated missense mutations (R874H, P1812L) converge on downregulation of mGluR1\\u2013IP3R1\\u2013calcium signaling with spine and LTP deficits, while truncating variants abolish Homer1 binding and synaptic targeting, establishing SHANK1 as a gene linked to autism spectrum disorder [#11, #12, #14]. Outside the nervous system, SHANK1 stability and expression are regulated by USP18-mediated deubiquitination and EZH2-mediated H3K27me3 silencing, and it scaffolds MDM2-dependent ubiquitination of Klotho in lung cancer cells [#13, #16, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that SHANK1 is a PSD scaffold answered where this neuronal protein acts by placing it in the postsynaptic density via direct PDZ-domain binding to GKAP/SAPAP.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP from rat synaptosomes, co-localization in hippocampal neurons\",\n      \"pmids\": [\"10488079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define structural basis of PDZ binding\", \"Did not establish in vivo requirement for synapse function\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying CIRL1 as a brain-validated PDZ ligand broadened the scaffold's repertoire of receptor partners at the PSD beyond GKAP.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, Co-IP from rat brain membranes, subcellular fractionation\",\n      \"pmids\": [\"10964907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of CIRL1 anchoring not defined\", \"CIRL2 bound in vitro but not in vivo, leaving selectivity unexplained\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The PDZ\\u2013GKAP co-crystal structure answered how SHANK1 recognizes its scaffold ligands at atomic resolution.\",\n      \"evidence\": \"X-ray crystallography of peptide-free and GKAP-bound PDZ domain\",\n      \"pmids\": [\"12136153\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional validation in this report\", \"Single ligand complex did not address binding plasticity\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping the IRSp53 interaction to the proline-rich region connected the scaffold to cdc42/actin-based filopodial signaling, explaining how SHANK1 could couple the PSD to cytoskeletal remodeling.\",\n      \"evidence\": \"Overlay assay, Co-IP from HEK293 cells, co-expression/localization in transfected cells\",\n      \"pmids\": [\"12504591\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Shown in heterologous cells, not native synapses\", \"Downstream actin effects on spine shape not directly measured\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying a 3\\u2032 UTR dendritic targeting element answered how SHANK1 mRNA reaches dendrites for local availability.\",\n      \"evidence\": \"Reporter transcript assays and in situ hybridization in hippocampal/cerebellar neurons\",\n      \"pmids\": [\"15121189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the trans-acting transport machinery\", \"Did not address translational regulation\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The knockout established the in vivo requirement for SHANK1, moving it from a binding partner to a determinant of spine size, PSD composition, and synaptic strength.\",\n      \"evidence\": \"Shank1\\u2212/\\u2212 mice with EM, electrophysiology, and PSD immunoblotting\",\n      \"pmids\": [\"18272690\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell types responsible for phenotype not resolved\", \"Did not separate scaffolding from signaling contributions\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defining KIF5C/staufen1-dependent transport and GC-rich 5\\u2032 UTR repression answered how SHANK1 mRNA is moved and held translationally silent in dendrites.\",\n      \"evidence\": \"Live imaging, dominant-negative interference, brain mRNP co-fractionation, reporter assays\",\n      \"pmids\": [\"19416473\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signal that derepresses translation locally not identified\", \"IRES-independence left activation mechanism open\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery of an ACG uORF and FMRP-bound G-quadruplexes resolved how SHANK1 is translated despite a highly structured 5\\u2032 UTR and how FMRP regulates it via 3\\u2032 UTR structures.\",\n      \"evidence\": \"Reporter mutagenesis of the ACG codon; biophysical and in vivo FMRP\\u2013G-quadruplex binding assays\",\n      \"pmids\": [\"24533096\", \"25692235\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological stimuli engaging the uORF not defined\", \"Functional outcome of FMRP regulation on synaptic SHANK1 not quantified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The PDZ\\u2013\\u03b2PIX structure revealed the plasticity that lets one domain bind diverse ligands, explaining the scaffold's promiscuity.\",\n      \"evidence\": \"X-ray crystallography at 2.3 \\u00c5 plus modeling of additional PDZ\\u2013peptide complexes\",\n      \"pmids\": [\"21376703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not test binding hierarchy among competing ligands\", \"No mutational test of identified contacts in cells\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Localizing SHANK1 to parvalbumin interneurons answered which circuit element drives the knockout phenotype, linking loss to an excitatory/inhibitory imbalance.\",\n      \"evidence\": \"Immunofluorescence, mEPSC/mIPSC recordings in Shank1\\u2212/\\u2212 mice, gephyrin immunoblot\",\n      \"pmids\": [\"25816842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking SHANK1 loss to reduced gephyrin not defined\", \"Behavioral consequence of E/I shift not assessed here\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Truncating variant analysis answered why human mutations are pathogenic: stable truncated protein loses Homer1 binding and fails to localize to synapses.\",\n      \"evidence\": \"NMD knock-in lines, HEK293 binding assays, neuronal localization imaging\",\n      \"pmids\": [\"34113010\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Synaptic functional deficit of mislocalized protein not measured\", \"Dominant vs loss-of-function mechanism not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"ASD missense knock-in models identified mGluR1\\u2013IP3R1\\u2013calcium signaling downregulation as the convergent pathological mechanism, with subsequent independent confirmation.\",\n      \"evidence\": \"R874H and P1812L knock-in mice with electrophysiology, EM, and pathway immunoblotting\",\n      \"pmids\": [\"35388181\", \"37880287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from SHANK1 to mGluR1 signaling not biochemically mapped\", \"Whether scaffolding loss or gain drives the deficit unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of a SHANK1\\u2013MDM2\\u2013Klotho ternary complex revealed a non-neuronal role for SHANK1 in scaffolding ubiquitination of a tumor suppressor.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, knockdown/overexpression in NSCLC cells, xenograft\",\n      \"pmids\": [\"35468874\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs bridged interactions within the complex not separated\", \"Domain of SHANK1 mediating MDM2/Klotho binding not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"USP18 deubiquitination and EZH2/H3K27me3 silencing answered how SHANK1 protein and transcript levels are set in cancer, with functional consequences for drug resistance and Wnt signaling.\",\n      \"evidence\": \"Co-IP and ubiquitination assays for USP18; promoter ChIP and rescue for EZH2; \\u03b2-catenin and tumor growth readouts\",\n      \"pmids\": [\"40096187\", \"41274253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How SHANK1 suppresses Wnt/\\u03b2-catenin mechanistically not defined\", \"Relationship between cancer and neuronal SHANK1 functions unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"PKA/CREB was shown to control SHANK1 transcription, defining an upstream signaling input that couples activity to scaffold abundance and synaptic function.\",\n      \"evidence\": \"PKA modulation, CREB S133A/S133D mutagenesis, RNA-seq, dendritic morphology and electrophysiology in rat hippocampus\",\n      \"pmids\": [\"40574425\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CREB binds the SHANK1 promoter directly not shown\", \"Physiological stimuli driving this axis not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SHANK1 mechanistically links its scaffold to mGluR1 signaling, and how local translational and transcriptional controls are integrated by synaptic activity in vivo, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical bridge from SHANK1 to mGluR1/IP3R1 mapped\", \"Activity-dependent coupling of transport, uORF, and PKA/CREB control not integrated\", \"Unified explanation for neuronal vs oncogenic roles absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 3, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0014069\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 10, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [6, 8, 9]}\n    ],\n    \"complexes\": [\n      \"postsynaptic density (PSD)\",\n      \"SHANK1-MDM2-Klotho ternary complex\"\n    ],\n    \"partners\": [\n      \"GKAP/SAPAP\",\n      \"CIRL1\",\n      \"IRSp53\",\n      \"Homer1\",\n      \"betaPIX\",\n      \"FMRP\",\n      \"MDM2\",\n      \"USP18\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}